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_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 112         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 113 };
 114
 115 static const int rta_max[RTM_NR_FAMILIES] =
 116 {
 117         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 118         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 119         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 120         [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
 121         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 122         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 123         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 124         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 125 };
 126
 127 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 128 {
 129         struct rtattr *rta;
 130         int size = RTA_LENGTH(attrlen);
 131
 132         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
 133         rta->rta_type = attrtype;
 134         rta->rta_len = size;
 135         memcpy(RTA_DATA(rta), data, attrlen);
 136         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 137 }
 138
 139 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
 140 {
 141         size_t ret = RTA_PAYLOAD(rta);
 142         char *src = RTA_DATA(rta);
 143
 144         if (ret > 0 && src[ret - 1] == '\0')
 145                 ret--;
 146         if (size > 0) {
 147                 size_t len = (ret >= size) ? size - 1 : ret;
 148                 memset(dest, 0, size);
 149                 memcpy(dest, src, len);
 150         }
 151         return ret;
 152 }
 153
 154 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
 155 {
 156         int err = 0;
 157
 158         NETLINK_CB(skb).dst_group = group;
 159         if (echo)
 160                 atomic_inc(&skb->users);
 161         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 162         if (echo)
 163                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 164         return err;
 165 }
 166
 167 int rtnl_unicast(struct sk_buff *skb, u32 pid)
 168 {
 169         return nlmsg_unicast(rtnl, skb, pid);
 170 }
 171
 172 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
 173                 struct nlmsghdr *nlh, gfp_t flags)
 174 {
 175         int report = 0;
 176
 177         if (nlh)
 178                 report = nlmsg_report(nlh);
 179
 180         return nlmsg_notify(rtnl, skb, pid, group, report, flags);
 181 }
 182
 183 void rtnl_set_sk_err(u32 group, int error)
 184 {
 185         netlink_set_err(rtnl, 0, group, error);
 186 }
 187
 188 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 189 {
 190         struct nlattr *mx;
 191         int i, valid = 0;
 192
 193         mx = nla_nest_start(skb, RTA_METRICS);
 194         if (mx == NULL)
 195                 return -ENOBUFS;
 196
 197         for (i = 0; i < RTAX_MAX; i++) {
 198                 if (metrics[i]) {
 199                         valid++;
 200                         NLA_PUT_U32(skb, i+1, metrics[i]);
 201                 }
 202         }
 203
 204         if (!valid) {
 205                 nla_nest_cancel(skb, mx);
 206                 return 0;
 207         }
 208
 209         return nla_nest_end(skb, mx);
 210
 211 nla_put_failure:
 212         return nla_nest_cancel(skb, mx);
 213 }
 214
 215
 216 static void set_operstate(struct net_device *dev, unsigned char transition)
 217 {
 218         unsigned char operstate = dev->operstate;
 219
 220         switch(transition) {
 221         case IF_OPER_UP:
 222                 if ((operstate == IF_OPER_DORMANT ||
 223                      operstate == IF_OPER_UNKNOWN) &&
 224                     !netif_dormant(dev))
 225                         operstate = IF_OPER_UP;
 226                 break;
 227
 228         case IF_OPER_DORMANT:
 229                 if (operstate == IF_OPER_UP ||
 230                     operstate == IF_OPER_UNKNOWN)
 231                         operstate = IF_OPER_DORMANT;
 232                 break;
 233         };
 234
 235         if (dev->operstate != operstate) {
 236                 write_lock_bh(&dev_base_lock);
 237                 dev->operstate = operstate;
 238                 write_unlock_bh(&dev_base_lock);
 239                 netdev_state_change(dev);
 240         }
 241 }
 242
 243 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 244                                  struct net_device_stats *b)
 245 {
 246         a->rx_packets = b->rx_packets;
 247         a->tx_packets = b->tx_packets;
 248         a->rx_bytes = b->rx_bytes;
 249         a->tx_bytes = b->tx_bytes;
 250         a->rx_errors = b->rx_errors;
 251         a->tx_errors = b->tx_errors;
 252         a->rx_dropped = b->rx_dropped;
 253         a->tx_dropped = b->tx_dropped;
 254
 255         a->multicast = b->multicast;
 256         a->collisions = b->collisions;
 257
 258         a->rx_length_errors = b->rx_length_errors;
 259         a->rx_over_errors = b->rx_over_errors;
 260         a->rx_crc_errors = b->rx_crc_errors;
 261         a->rx_frame_errors = b->rx_frame_errors;
 262         a->rx_fifo_errors = b->rx_fifo_errors;
 263         a->rx_missed_errors = b->rx_missed_errors;
 264
 265         a->tx_aborted_errors = b->tx_aborted_errors;
 266         a->tx_carrier_errors = b->tx_carrier_errors;
 267         a->tx_fifo_errors = b->tx_fifo_errors;
 268         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 269         a->tx_window_errors = b->tx_window_errors;
 270
 271         a->rx_compressed = b->rx_compressed;
 272         a->tx_compressed = b->tx_compressed;
 273 };
 274
 275 static inline size_t if_nlmsg_size(int iwbuflen)
 276 {
 277         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 278                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 279                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 280                + nla_total_size(sizeof(struct rtnl_link_ifmap))
 281                + nla_total_size(sizeof(struct rtnl_link_stats))
 282                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 283                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 284                + nla_total_size(4) /* IFLA_TXQLEN */
 285                + nla_total_size(4) /* IFLA_WEIGHT */
 286                + nla_total_size(4) /* IFLA_MTU */
 287                + nla_total_size(4) /* IFLA_LINK */
 288                + nla_total_size(4) /* IFLA_MASTER */
 289                + nla_total_size(1) /* IFLA_OPERSTATE */
 290                + nla_total_size(1) /* IFLA_LINKMODE */
 291                + nla_total_size(iwbuflen);
 292 }
 293
 294 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 295                             void *iwbuf, int iwbuflen, int type, u32 pid,
 296                             u32 seq, u32 change, unsigned int flags)
 297 {
 298         struct ifinfomsg *ifm;
 299         struct nlmsghdr *nlh;
 300
 301         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 302         if (nlh == NULL)
 303                 return -ENOBUFS;
 304
 305         ifm = nlmsg_data(nlh);
 306         ifm->ifi_family = AF_UNSPEC;
 307         ifm->__ifi_pad = 0;
 308         ifm->ifi_type = dev->type;
 309         ifm->ifi_index = dev->ifindex;
 310         ifm->ifi_flags = dev_get_flags(dev);
 311         ifm->ifi_change = change;
 312
 313         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 314         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
 315         NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
 316         NLA_PUT_U8(skb, IFLA_OPERSTATE,
 317                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
 318         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
 319         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
 320
 321         if (dev->ifindex != dev->iflink)
 322                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
 323
 324         if (dev->master)
 325                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
 326
 327         if (dev->qdisc_sleeping)
 328                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
 329
 330         if (1) {
 331                 struct rtnl_link_ifmap map = {
 332                         .mem_start   = dev->mem_start,
 333                         .mem_end     = dev->mem_end,
 334                         .base_addr   = dev->base_addr,
 335                         .irq         = dev->irq,
 336                         .dma         = dev->dma,
 337                         .port        = dev->if_port,
 338                 };
 339                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 340         }
 341
 342         if (dev->addr_len) {
 343                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 344                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 345         }
 346
 347         if (dev->get_stats) {
 348                 struct net_device_stats *stats = dev->get_stats(dev);
 349                 if (stats) {
 350                         struct nlattr *attr;
 351
 352                         attr = nla_reserve(skb, IFLA_STATS,
 353                                            sizeof(struct rtnl_link_stats));
 354                         if (attr == NULL)
 355                                 goto nla_put_failure;
 356
 357                         copy_rtnl_link_stats(nla_data(attr), stats);
 358                 }
 359         }
 360
 361         if (iwbuf)
 362                 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
 363
 364         return nlmsg_end(skb, nlh);
 365
 366 nla_put_failure:
 367         return nlmsg_cancel(skb, nlh);
 368 }
 369
 370 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 371 {
 372         int idx;
 373         int s_idx = cb->args[0];
 374         struct net_device *dev;
 375
 376         read_lock(&dev_base_lock);
 377         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 378                 if (idx < s_idx)
 379                         continue;
 380                 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
 381                                      NETLINK_CB(cb->skb).pid,
 382                                      cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
 383                         break;
 384         }
 385         read_unlock(&dev_base_lock);
 386         cb->args[0] = idx;
 387
 388         return skb->len;
 389 }
 390
 391 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
 392         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
 393         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
 394         [IFLA_MTU]              = { .type = NLA_U32 },
 395         [IFLA_TXQLEN]           = { .type = NLA_U32 },
 396         [IFLA_WEIGHT]           = { .type = NLA_U32 },
 397         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
 398         [IFLA_LINKMODE]         = { .type = NLA_U8 },
 399 };
 400
 401 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 402 {
 403         struct ifinfomsg *ifm;
 404         struct net_device *dev;
 405         int err, send_addr_notify = 0, modified = 0;
 406         struct nlattr *tb[IFLA_MAX+1];
 407         char ifname[IFNAMSIZ];
 408
 409         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 410         if (err < 0)
 411                 goto errout;
 412
 413         if (tb[IFLA_IFNAME])
 414                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
 415         else
 416                 ifname[0] = '\0';
 417
 418         err = -EINVAL;
 419         ifm = nlmsg_data(nlh);
 420         if (ifm->ifi_index >= 0)
 421                 dev = dev_get_by_index(ifm->ifi_index);
 422         else if (tb[IFLA_IFNAME])
 423                 dev = dev_get_by_name(ifname);
 424         else
 425                 goto errout;
 426
 427         if (dev == NULL) {
 428                 err = -ENODEV;
 429                 goto errout;
 430         }
 431
 432         if (tb[IFLA_ADDRESS] &&
 433             nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
 434                 goto errout_dev;
 435
 436         if (tb[IFLA_BROADCAST] &&
 437             nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
 438                 goto errout_dev;
 439
 440         if (tb[IFLA_MAP]) {
 441                 struct rtnl_link_ifmap *u_map;
 442                 struct ifmap k_map;
 443
 444                 if (!dev->set_config) {
 445                         err = -EOPNOTSUPP;
 446                         goto errout_dev;
 447                 }
 448
 449                 if (!netif_device_present(dev)) {
 450                         err = -ENODEV;
 451                         goto errout_dev;
 452                 }
 453
 454                 u_map = nla_data(tb[IFLA_MAP]);
 455                 k_map.mem_start = (unsigned long) u_map->mem_start;
 456                 k_map.mem_end = (unsigned long) u_map->mem_end;
 457                 k_map.base_addr = (unsigned short) u_map->base_addr;
 458                 k_map.irq = (unsigned char) u_map->irq;
 459                 k_map.dma = (unsigned char) u_map->dma;
 460                 k_map.port = (unsigned char) u_map->port;
 461
 462                 err = dev->set_config(dev, &k_map);
 463                 if (err < 0)
 464                         goto errout_dev;
 465
 466                 modified = 1;
 467         }
 468
 469         if (tb[IFLA_ADDRESS]) {
 470                 struct sockaddr *sa;
 471                 int len;
 472
 473                 if (!dev->set_mac_address) {
 474                         err = -EOPNOTSUPP;
 475                         goto errout_dev;
 476                 }
 477
 478                 if (!netif_device_present(dev)) {
 479                         err = -ENODEV;
 480                         goto errout_dev;
 481                 }
 482
 483                 len = sizeof(sa_family_t) + dev->addr_len;
 484                 sa = kmalloc(len, GFP_KERNEL);
 485                 if (!sa) {
 486                         err = -ENOMEM;
 487                         goto errout_dev;
 488                 }
 489                 sa->sa_family = dev->type;
 490                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
 491                        dev->addr_len);
 492                 err = dev->set_mac_address(dev, sa);
 493                 kfree(sa);
 494                 if (err)
 495                         goto errout_dev;
 496                 send_addr_notify = 1;
 497                 modified = 1;
 498         }
 499
 500         if (tb[IFLA_MTU]) {
 501                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
 502                 if (err < 0)
 503                         goto errout_dev;
 504                 modified = 1;
 505         }
 506
 507         /*
 508          * Interface selected by interface index but interface
 509          * name provided implies that a name change has been
 510          * requested.
 511          */
 512         if (ifm->ifi_index >= 0 && ifname[0]) {
 513                 err = dev_change_name(dev, ifname);
 514                 if (err < 0)
 515                         goto errout_dev;
 516                 modified = 1;
 517         }
 518
 519 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 520         if (tb[IFLA_WIRELESS]) {
 521                 /* Call Wireless Extensions.
 522                  * Various stuff checked in there... */
 523                 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
 524                                              nla_len(tb[IFLA_WIRELESS]));
 525                 if (err < 0)
 526                         goto errout_dev;
 527         }
 528 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 529
 530         if (tb[IFLA_BROADCAST]) {
 531                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
 532                 send_addr_notify = 1;
 533         }
 534
 535
 536         if (ifm->ifi_flags)
 537                 dev_change_flags(dev, ifm->ifi_flags);
 538
 539         if (tb[IFLA_TXQLEN])
 540                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
 541
 542         if (tb[IFLA_WEIGHT])
 543                 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
 544
 545         if (tb[IFLA_OPERSTATE])
 546                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 547
 548         if (tb[IFLA_LINKMODE]) {
 549                 write_lock_bh(&dev_base_lock);
 550                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
 551                 write_unlock_bh(&dev_base_lock);
 552         }
 553
 554         err = 0;
 555
 556 errout_dev:
 557         if (err < 0 && modified && net_ratelimit())
 558                 printk(KERN_WARNING "A link change request failed with "
 559                        "some changes comitted already. Interface %s may "
 560                        "have been left with an inconsistent configuration, "
 561                        "please check.\n", dev->name);
 562
 563         if (send_addr_notify)
 564                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 565
 566         dev_put(dev);
 567 errout:
 568         return err;
 569 }
 570
 571 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 572 {
 573         struct ifinfomsg *ifm;
 574         struct nlattr *tb[IFLA_MAX+1];
 575         struct net_device *dev = NULL;
 576         struct sk_buff *nskb;
 577         char *iw_buf = NULL, *iw = NULL;
 578         int iw_buf_len = 0;
 579         int err;
 580
 581         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 582         if (err < 0)
 583                 return err;
 584
 585         ifm = nlmsg_data(nlh);
 586         if (ifm->ifi_index >= 0) {
 587                 dev = dev_get_by_index(ifm->ifi_index);
 588                 if (dev == NULL)
 589                         return -ENODEV;
 590         } else
 591                 return -EINVAL;
 592
 593
 594 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 595         if (tb[IFLA_WIRELESS]) {
 596                 /* Call Wireless Extensions. We need to know the size before
 597                  * we can alloc. Various stuff checked in there... */
 598                 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
 599                                              nla_len(tb[IFLA_WIRELESS]),
 600                                              &iw_buf, &iw_buf_len);
 601                 if (err < 0)
 602                         goto errout;
 603
 604                 iw += IW_EV_POINT_OFF;
 605         }
 606 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 607
 608         nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL);
 609         if (nskb == NULL) {
 610                 err = -ENOBUFS;
 611                 goto errout;
 612         }
 613
 614         err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
 615                                NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
 616         /* failure impilies BUG in if_nlmsg_size or wireless_rtnetlink_get */
 617         BUG_ON(err < 0);
 618
 619         err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
 620 errout:
 621         kfree(iw_buf);
 622         dev_put(dev);
 623
 624         return err;
 625 }
 626
 627 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 628 {
 629         int idx;
 630         int s_idx = cb->family;
 631
 632         if (s_idx == 0)
 633                 s_idx = 1;
 634         for (idx=1; idx<NPROTO; idx++) {
 635                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 636                 if (idx < s_idx || idx == PF_PACKET)
 637                         continue;
 638                 if (rtnetlink_links[idx] == NULL ||
 639                     rtnetlink_links[idx][type].dumpit == NULL)
 640                         continue;
 641                 if (idx > s_idx)
 642                         memset(&cb->args[0], 0, sizeof(cb->args));
 643                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 644                         break;
 645         }
 646         cb->family = idx;
 647
 648         return skb->len;
 649 }
 650
 651 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 652 {
 653         struct sk_buff *skb;
 654         int err = -ENOBUFS;
 655
 656         skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL);
 657         if (skb == NULL)
 658                 goto errout;
 659
 660         err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
 661         /* failure implies BUG in if_nlmsg_size() */
 662         BUG_ON(err < 0);
 663
 664         err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
 665 errout:
 666         if (err < 0)
 667                 rtnl_set_sk_err(RTNLGRP_LINK, err);
 668 }
 669
 670 /* Protected by RTNL sempahore.  */
 671 static struct rtattr **rta_buf;
 672 static int rtattr_max;
 673
 674 /* Process one rtnetlink message. */
 675
 676 static __inline__ int
 677 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 678 {
 679         struct rtnetlink_link *link;
 680         struct rtnetlink_link *link_tab;
 681         int sz_idx, kind;
 682         int min_len;
 683         int family;
 684         int type;
 685         int err;
 686
 687         /* Only requests are handled by kernel now */
 688         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 689                 return 0;
 690
 691         type = nlh->nlmsg_type;
 692
 693         /* A control message: ignore them */
 694         if (type < RTM_BASE)
 695                 return 0;
 696
 697         /* Unknown message: reply with EINVAL */
 698         if (type > RTM_MAX)
 699                 goto err_inval;
 700
 701         type -= RTM_BASE;
 702
 703         /* All the messages must have at least 1 byte length */
 704         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
 705                 return 0;
 706
 707         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
 708         if (family >= NPROTO) {
 709                 *errp = -EAFNOSUPPORT;
 710                 return -1;
 711         }
 712
 713         link_tab = rtnetlink_links[family];
 714         if (link_tab == NULL)
 715                 link_tab = rtnetlink_links[PF_UNSPEC];
 716         link = &link_tab[type];
 717
 718         sz_idx = type>>2;
 719         kind = type&3;
 720
 721         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
 722                 *errp = -EPERM;
 723                 return -1;
 724         }
 725
 726         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 727                 if (link->dumpit == NULL)
 728                         link = &(rtnetlink_links[PF_UNSPEC][type]);
 729
 730                 if (link->dumpit == NULL)
 731                         goto err_inval;
 732
 733                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
 734                                                 link->dumpit, NULL)) != 0) {
 735                         return -1;
 736                 }
 737
 738                 netlink_queue_skip(nlh, skb);
 739                 return -1;
 740         }
 741
 742         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
 743
 744         min_len = rtm_min[sz_idx];
 745         if (nlh->nlmsg_len < min_len)
 746                 goto err_inval;
 747
 748         if (nlh->nlmsg_len > min_len) {
 749                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
 750                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
 751
 752                 while (RTA_OK(attr, attrlen)) {
 753                         unsigned flavor = attr->rta_type;
 754                         if (flavor) {
 755                                 if (flavor > rta_max[sz_idx])
 756                                         goto err_inval;
 757                                 rta_buf[flavor-1] = attr;
 758                         }
 759                         attr = RTA_NEXT(attr, attrlen);
 760                 }
 761         }
 762
 763         if (link->doit == NULL)
 764                 link = &(rtnetlink_links[PF_UNSPEC][type]);
 765         if (link->doit == NULL)
 766                 goto err_inval;
 767         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
 768
 769         *errp = err;
 770         return err;
 771
 772 err_inval:
 773         *errp = -EINVAL;
 774         return -1;
 775 }
 776
 777 static void rtnetlink_rcv(struct sock *sk, int len)
 778 {
 779         unsigned int qlen = 0;
 780
 781         do {
 782                 mutex_lock(&rtnl_mutex);
 783                 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
 784                 mutex_unlock(&rtnl_mutex);
 785
 786                 netdev_run_todo();
 787         } while (qlen);
 788 }
 789
 790 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 791 {
 792         [RTM_GETLINK     - RTM_BASE] = { .doit   = rtnl_getlink,
 793                                          .dumpit = rtnl_dump_ifinfo      },
 794         [RTM_SETLINK     - RTM_BASE] = { .doit   = rtnl_setlink          },
 795         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 796         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 797         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
 798         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
 799         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
 800 #ifdef CONFIG_FIB_RULES
 801         [RTM_NEWRULE     - RTM_BASE] = { .doit   = fib_nl_newrule        },
 802         [RTM_DELRULE     - RTM_BASE] = { .doit   = fib_nl_delrule        },
 803 #endif
 804         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 805         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
 806         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
 807 };
 808
 809 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 810 {
 811         struct net_device *dev = ptr;
 812         switch (event) {
 813         case NETDEV_UNREGISTER:
 814                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 815                 break;
 816         case NETDEV_REGISTER:
 817                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
 818                 break;
 819         case NETDEV_UP:
 820         case NETDEV_DOWN:
 821                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
 822                 break;
 823         case NETDEV_CHANGE:
 824         case NETDEV_GOING_DOWN:
 825                 break;
 826         default:
 827                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 828                 break;
 829         }
 830         return NOTIFY_DONE;
 831 }
 832
 833 static struct notifier_block rtnetlink_dev_notifier = {
 834         .notifier_call  = rtnetlink_event,
 835 };
 836
 837 void __init rtnetlink_init(void)
 838 {
 839         int i;
 840
 841         rtattr_max = 0;
 842         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
 843                 if (rta_max[i] > rtattr_max)
 844                         rtattr_max = rta_max[i];
 845         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
 846         if (!rta_buf)
 847                 panic("rtnetlink_init: cannot allocate rta_buf\n");
 848
 849         rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
 850                                      THIS_MODULE);
 851         if (rtnl == NULL)
 852                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
 853         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
 854         register_netdevice_notifier(&rtnetlink_dev_notifier);
 855         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
 856         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
 857 }
 858
 859 EXPORT_SYMBOL(__rta_fill);
 860 EXPORT_SYMBOL(rtattr_strlcpy);
 861 EXPORT_SYMBOL(rtattr_parse);
 862 EXPORT_SYMBOL(rtnetlink_links);
 863 EXPORT_SYMBOL(rtnetlink_put_metrics);
 864 EXPORT_SYMBOL(rtnl_lock);
 865 EXPORT_SYMBOL(rtnl_trylock);
 866 EXPORT_SYMBOL(rtnl_unlock);
 867 EXPORT_SYMBOL(rtnl_unicast);
 868 EXPORT_SYMBOL(rtnl_notify);
 869 EXPORT_SYMBOL(rtnl_set_sk_err);