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