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/config.h>
  20 #include <linux/errno.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/kernel.h>
  25 #include <linux/sched.h>
  26 #include <linux/timer.h>
  27 #include <linux/string.h>
  28 #include <linux/sockios.h>
  29 #include <linux/net.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/mm.h>
  32 #include <linux/slab.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/capability.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/init.h>
  37 #include <linux/security.h>
  38
  39 #include <asm/uaccess.h>
  40 #include <asm/system.h>
  41 #include <asm/string.h>
  42
  43 #include <linux/inet.h>
  44 #include <linux/netdevice.h>
  45 #include <net/ip.h>
  46 #include <net/protocol.h>
  47 #include <net/arp.h>
  48 #include <net/route.h>
  49 #include <net/udp.h>
  50 #include <net/sock.h>
  51 #include <net/pkt_sched.h>
  52
  53 DECLARE_MUTEX(rtnl_sem);
  54
  55 void rtnl_lock(void)
  56 {
  57         rtnl_shlock();
  58 }
  59
  60 int rtnl_lock_interruptible(void)
  61 {
  62         return down_interruptible(&rtnl_sem);
  63 }
  64
  65 void rtnl_unlock(void)
  66 {
  67         rtnl_shunlock();
  68
  69         netdev_run_todo();
  70 }
  71
  72 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
  73 {
  74         memset(tb, 0, sizeof(struct rtattr*)*maxattr);
  75
  76         while (RTA_OK(rta, len)) {
  77                 unsigned flavor = rta->rta_type;
  78                 if (flavor && flavor <= maxattr)
  79                         tb[flavor-1] = rta;
  80                 rta = RTA_NEXT(rta, len);
  81         }
  82         return 0;
  83 }
  84
  85 struct sock *rtnl;
  86
  87 struct rtnetlink_link * rtnetlink_links[NPROTO];
  88
  89 static const int rtm_min[RTM_NR_FAMILIES] =
  90 {
  91         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
  92         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
  93         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
  94         [RTM_FAM(RTM_NEWNEIGH)]     = NLMSG_LENGTH(sizeof(struct ndmsg)),
  95         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct rtmsg)),
  96         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
  97         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
  98         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
  99         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
 100         [RTM_FAM(RTM_NEWPREFIX)]    = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 101         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 102         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 103         [RTM_FAM(RTM_NEWNEIGHTBL)]  = NLMSG_LENGTH(sizeof(struct ndtmsg)),
 104 };
 105
 106 static const int rta_max[RTM_NR_FAMILIES] =
 107 {
 108         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 109         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 110         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 111         [RTM_FAM(RTM_NEWNEIGH)]     = NDA_MAX,
 112         [RTM_FAM(RTM_NEWRULE)]      = RTA_MAX,
 113         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 114         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 115         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 116         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 117         [RTM_FAM(RTM_NEWNEIGHTBL)]  = NDTA_MAX,
 118 };
 119
 120 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 121 {
 122         struct rtattr *rta;
 123         int size = RTA_LENGTH(attrlen);
 124
 125         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
 126         rta->rta_type = attrtype;
 127         rta->rta_len = size;
 128         memcpy(RTA_DATA(rta), data, attrlen);
 129         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 130 }
 131
 132 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
 133 {
 134         size_t ret = RTA_PAYLOAD(rta);
 135         char *src = RTA_DATA(rta);
 136
 137         if (ret > 0 && src[ret - 1] == '\0')
 138                 ret--;
 139         if (size > 0) {
 140                 size_t len = (ret >= size) ? size - 1 : ret;
 141                 memset(dest, 0, size);
 142                 memcpy(dest, src, len);
 143         }
 144         return ret;
 145 }
 146
 147 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
 148 {
 149         int err = 0;
 150
 151         NETLINK_CB(skb).dst_groups = group;
 152         if (echo)
 153                 atomic_inc(&skb->users);
 154         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 155         if (echo)
 156                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 157         return err;
 158 }
 159
 160 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 161 {
 162         struct rtattr *mx = (struct rtattr*)skb->tail;
 163         int i;
 164
 165         RTA_PUT(skb, RTA_METRICS, 0, NULL);
 166         for (i=0; i<RTAX_MAX; i++) {
 167                 if (metrics[i])
 168                         RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
 169         }
 170         mx->rta_len = skb->tail - (u8*)mx;
 171         if (mx->rta_len == RTA_LENGTH(0))
 172                 skb_trim(skb, (u8*)mx - skb->data);
 173         return 0;
 174
 175 rtattr_failure:
 176         skb_trim(skb, (u8*)mx - skb->data);
 177         return -1;
 178 }
 179
 180
 181 static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 182                                  int type, u32 pid, u32 seq, u32 change,
 183                                  unsigned int flags)
 184 {
 185         struct ifinfomsg *r;
 186         struct nlmsghdr  *nlh;
 187         unsigned char    *b = skb->tail;
 188
 189         nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags);
 190         r = NLMSG_DATA(nlh);
 191         r->ifi_family = AF_UNSPEC;
 192         r->ifi_type = dev->type;
 193         r->ifi_index = dev->ifindex;
 194         r->ifi_flags = dev_get_flags(dev);
 195         r->ifi_change = change;
 196
 197         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
 198
 199         if (1) {
 200                 u32 txqlen = dev->tx_queue_len;
 201                 RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
 202         }
 203
 204         if (1) {
 205                 u32 weight = dev->weight;
 206                 RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
 207         }
 208
 209         if (1) {
 210                 struct rtnl_link_ifmap map = {
 211                         .mem_start   = dev->mem_start,
 212                         .mem_end     = dev->mem_end,
 213                         .base_addr   = dev->base_addr,
 214                         .irq         = dev->irq,
 215                         .dma         = dev->dma,
 216                         .port        = dev->if_port,
 217                 };
 218                 RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 219         }
 220
 221         if (dev->addr_len) {
 222                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 223                 RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 224         }
 225
 226         if (1) {
 227                 u32 mtu = dev->mtu;
 228                 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
 229         }
 230
 231         if (dev->ifindex != dev->iflink) {
 232                 u32 iflink = dev->iflink;
 233                 RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
 234         }
 235
 236         if (dev->qdisc_sleeping)
 237                 RTA_PUT(skb, IFLA_QDISC,
 238                         strlen(dev->qdisc_sleeping->ops->id) + 1,
 239                         dev->qdisc_sleeping->ops->id);
 240
 241         if (dev->master) {
 242                 u32 master = dev->master->ifindex;
 243                 RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
 244         }
 245
 246         if (dev->get_stats) {
 247                 unsigned long *stats = (unsigned long*)dev->get_stats(dev);
 248                 if (stats) {
 249                         struct rtattr  *a;
 250                         __u32          *s;
 251                         int             i;
 252                         int             n = sizeof(struct rtnl_link_stats)/4;
 253
 254                         a = __RTA_PUT(skb, IFLA_STATS, n*4);
 255                         s = RTA_DATA(a);
 256                         for (i=0; i<n; i++)
 257                                 s[i] = stats[i];
 258                 }
 259         }
 260         nlh->nlmsg_len = skb->tail - b;
 261         return skb->len;
 262
 263 nlmsg_failure:
 264 rtattr_failure:
 265         skb_trim(skb, b - skb->data);
 266         return -1;
 267 }
 268
 269 static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 270 {
 271         int idx;
 272         int s_idx = cb->args[0];
 273         struct net_device *dev;
 274
 275         read_lock(&dev_base_lock);
 276         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 277                 if (idx < s_idx)
 278                         continue;
 279                 if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK,
 280                                           NETLINK_CB(cb->skb).pid,
 281                                           cb->nlh->nlmsg_seq, 0,
 282                                           NLM_F_MULTI) <= 0)
 283                         break;
 284         }
 285         read_unlock(&dev_base_lock);
 286         cb->args[0] = idx;
 287
 288         return skb->len;
 289 }
 290
 291 static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 292 {
 293         struct ifinfomsg  *ifm = NLMSG_DATA(nlh);
 294         struct rtattr    **ida = arg;
 295         struct net_device *dev;
 296         int err, send_addr_notify = 0;
 297
 298         if (ifm->ifi_index >= 0)
 299                 dev = dev_get_by_index(ifm->ifi_index);
 300         else if (ida[IFLA_IFNAME - 1]) {
 301                 char ifname[IFNAMSIZ];
 302
 303                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 304                                    IFNAMSIZ) >= IFNAMSIZ)
 305                         return -EINVAL;
 306                 dev = dev_get_by_name(ifname);
 307         } else
 308                 return -EINVAL;
 309
 310         if (!dev)
 311                 return -ENODEV;
 312
 313         err = -EINVAL;
 314
 315         if (ifm->ifi_flags)
 316                 dev_change_flags(dev, ifm->ifi_flags);
 317
 318         if (ida[IFLA_MAP - 1]) {
 319                 struct rtnl_link_ifmap *u_map;
 320                 struct ifmap k_map;
 321
 322                 if (!dev->set_config) {
 323                         err = -EOPNOTSUPP;
 324                         goto out;
 325                 }
 326
 327                 if (!netif_device_present(dev)) {
 328                         err = -ENODEV;
 329                         goto out;
 330                 }
 331
 332                 if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
 333                         goto out;
 334
 335                 u_map = RTA_DATA(ida[IFLA_MAP - 1]);
 336
 337                 k_map.mem_start = (unsigned long) u_map->mem_start;
 338                 k_map.mem_end = (unsigned long) u_map->mem_end;
 339                 k_map.base_addr = (unsigned short) u_map->base_addr;
 340                 k_map.irq = (unsigned char) u_map->irq;
 341                 k_map.dma = (unsigned char) u_map->dma;
 342                 k_map.port = (unsigned char) u_map->port;
 343
 344                 err = dev->set_config(dev, &k_map);
 345
 346                 if (err)
 347                         goto out;
 348         }
 349
 350         if (ida[IFLA_ADDRESS - 1]) {
 351                 if (!dev->set_mac_address) {
 352                         err = -EOPNOTSUPP;
 353                         goto out;
 354                 }
 355                 if (!netif_device_present(dev)) {
 356                         err = -ENODEV;
 357                         goto out;
 358                 }
 359                 if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 360                         goto out;
 361
 362                 err = dev->set_mac_address(dev, RTA_DATA(ida[IFLA_ADDRESS - 1]));
 363                 if (err)
 364                         goto out;
 365                 send_addr_notify = 1;
 366         }
 367
 368         if (ida[IFLA_BROADCAST - 1]) {
 369                 if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 370                         goto out;
 371                 memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
 372                        dev->addr_len);
 373                 send_addr_notify = 1;
 374         }
 375
 376         if (ida[IFLA_MTU - 1]) {
 377                 if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 378                         goto out;
 379                 err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
 380
 381                 if (err)
 382                         goto out;
 383
 384         }
 385
 386         if (ida[IFLA_TXQLEN - 1]) {
 387                 if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 388                         goto out;
 389
 390                 dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
 391         }
 392
 393         if (ida[IFLA_WEIGHT - 1]) {
 394                 if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 395                         goto out;
 396
 397                 dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
 398         }
 399
 400         if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
 401                 char ifname[IFNAMSIZ];
 402
 403                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 404                                    IFNAMSIZ) >= IFNAMSIZ)
 405                         goto out;
 406                 err = dev_change_name(dev, ifname);
 407                 if (err)
 408                         goto out;
 409         }
 410
 411         err = 0;
 412
 413 out:
 414         if (send_addr_notify)
 415                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 416
 417         dev_put(dev);
 418         return err;
 419 }
 420
 421 static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 422 {
 423         int idx;
 424         int s_idx = cb->family;
 425
 426         if (s_idx == 0)
 427                 s_idx = 1;
 428         for (idx=1; idx<NPROTO; idx++) {
 429                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 430                 if (idx < s_idx || idx == PF_PACKET)
 431                         continue;
 432                 if (rtnetlink_links[idx] == NULL ||
 433                     rtnetlink_links[idx][type].dumpit == NULL)
 434                         continue;
 435                 if (idx > s_idx)
 436                         memset(&cb->args[0], 0, sizeof(cb->args));
 437                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 438                         break;
 439         }
 440         cb->family = idx;
 441
 442         return skb->len;
 443 }
 444
 445 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 446 {
 447         struct sk_buff *skb;
 448         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
 449                                sizeof(struct rtnl_link_ifmap) +
 450                                sizeof(struct rtnl_link_stats) + 128);
 451
 452         skb = alloc_skb(size, GFP_KERNEL);
 453         if (!skb)
 454                 return;
 455
 456         if (rtnetlink_fill_ifinfo(skb, dev, type, current->pid, 0, change, 0) < 0) {
 457                 kfree_skb(skb);
 458                 return;
 459         }
 460         NETLINK_CB(skb).dst_groups = RTMGRP_LINK;
 461         netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_KERNEL);
 462 }
 463
 464 static int rtnetlink_done(struct netlink_callback *cb)
 465 {
 466         return 0;
 467 }
 468
 469 /* Protected by RTNL sempahore.  */
 470 static struct rtattr **rta_buf;
 471 static int rtattr_max;
 472
 473 /* Process one rtnetlink message. */
 474
 475 static __inline__ int
 476 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 477 {
 478         struct rtnetlink_link *link;
 479         struct rtnetlink_link *link_tab;
 480         int sz_idx, kind;
 481         int min_len;
 482         int family;
 483         int type;
 484         int err;
 485
 486         /* Only requests are handled by kernel now */
 487         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 488                 return 0;
 489
 490         type = nlh->nlmsg_type;
 491
 492         /* A control message: ignore them */
 493         if (type < RTM_BASE)
 494                 return 0;
 495
 496         /* Unknown message: reply with EINVAL */
 497         if (type > RTM_MAX)
 498                 goto err_inval;
 499
 500         type -= RTM_BASE;
 501
 502         /* All the messages must have at least 1 byte length */
 503         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
 504                 return 0;
 505
 506         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
 507         if (family >= NPROTO) {
 508                 *errp = -EAFNOSUPPORT;
 509                 return -1;
 510         }
 511
 512         link_tab = rtnetlink_links[family];
 513         if (link_tab == NULL)
 514                 link_tab = rtnetlink_links[PF_UNSPEC];
 515         link = &link_tab[type];
 516
 517         sz_idx = type>>2;
 518         kind = type&3;
 519
 520         if (kind != 2 && security_netlink_recv(skb)) {
 521                 *errp = -EPERM;
 522                 return -1;
 523         }
 524
 525         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 526                 u32 rlen;
 527
 528                 if (link->dumpit == NULL)
 529                         link = &(rtnetlink_links[PF_UNSPEC][type]);
 530
 531                 if (link->dumpit == NULL)
 532                         goto err_inval;
 533
 534                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
 535                                                 link->dumpit,
 536                                                 rtnetlink_done)) != 0) {
 537                         return -1;
 538                 }
 539                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
 540                 if (rlen > skb->len)
 541                         rlen = skb->len;
 542                 skb_pull(skb, rlen);
 543                 return -1;
 544         }
 545
 546         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
 547
 548         min_len = rtm_min[sz_idx];
 549         if (nlh->nlmsg_len < min_len)
 550                 goto err_inval;
 551
 552         if (nlh->nlmsg_len > min_len) {
 553                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
 554                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
 555
 556                 while (RTA_OK(attr, attrlen)) {
 557                         unsigned flavor = attr->rta_type;
 558                         if (flavor) {
 559                                 if (flavor > rta_max[sz_idx])
 560                                         goto err_inval;
 561                                 rta_buf[flavor-1] = attr;
 562                         }
 563                         attr = RTA_NEXT(attr, attrlen);
 564                 }
 565         }
 566
 567         if (link->doit == NULL)
 568                 link = &(rtnetlink_links[PF_UNSPEC][type]);
 569         if (link->doit == NULL)
 570                 goto err_inval;
 571         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
 572
 573         *errp = err;
 574         return err;
 575
 576 err_inval:
 577         *errp = -EINVAL;
 578         return -1;
 579 }
 580
 581 /*
 582  * Process one packet of messages.
 583  * Malformed skbs with wrong lengths of messages are discarded silently.
 584  */
 585
 586 static inline int rtnetlink_rcv_skb(struct sk_buff *skb)
 587 {
 588         int err;
 589         struct nlmsghdr * nlh;
 590
 591         while (skb->len >= NLMSG_SPACE(0)) {
 592                 u32 rlen;
 593
 594                 nlh = (struct nlmsghdr *)skb->data;
 595                 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
 596                         return 0;
 597                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
 598                 if (rlen > skb->len)
 599                         rlen = skb->len;
 600                 if (rtnetlink_rcv_msg(skb, nlh, &err)) {
 601                         /* Not error, but we must interrupt processing here:
 602                          *   Note, that in this case we do not pull message
 603                          *   from skb, it will be processed later.
 604                          */
 605                         if (err == 0)
 606                                 return -1;
 607                         netlink_ack(skb, nlh, err);
 608                 } else if (nlh->nlmsg_flags&NLM_F_ACK)
 609                         netlink_ack(skb, nlh, 0);
 610                 skb_pull(skb, rlen);
 611         }
 612
 613         return 0;
 614 }
 615
 616 /*
 617  *  rtnetlink input queue processing routine:
 618  *      - process as much as there was in the queue upon entry.
 619  *      - feed skbs to rtnetlink_rcv_skb, until it refuse a message,
 620  *        that will occur, when a dump started.
 621  */
 622
 623 static void rtnetlink_rcv(struct sock *sk, int len)
 624 {
 625         unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
 626
 627         do {
 628                 struct sk_buff *skb;
 629
 630                 rtnl_lock();
 631
 632                 if (qlen > skb_queue_len(&sk->sk_receive_queue))
 633                         qlen = skb_queue_len(&sk->sk_receive_queue);
 634
 635                 for (; qlen; qlen--) {
 636                         skb = skb_dequeue(&sk->sk_receive_queue);
 637                         if (rtnetlink_rcv_skb(skb)) {
 638                                 if (skb->len)
 639                                         skb_queue_head(&sk->sk_receive_queue,
 640                                                        skb);
 641                                 else {
 642                                         kfree_skb(skb);
 643                                         qlen--;
 644                                 }
 645                                 break;
 646                         }
 647                         kfree_skb(skb);
 648                 }
 649
 650                 up(&rtnl_sem);
 651
 652                 netdev_run_todo();
 653         } while (qlen);
 654 }
 655
 656 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 657 {
 658         [RTM_GETLINK     - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo },
 659         [RTM_SETLINK     - RTM_BASE] = { .doit   = do_setlink            },
 660         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 661         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 662         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
 663         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
 664         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
 665         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 666         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
 667         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
 668 };
 669
 670 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 671 {
 672         struct net_device *dev = ptr;
 673         switch (event) {
 674         case NETDEV_UNREGISTER:
 675                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 676                 break;
 677         case NETDEV_REGISTER:
 678                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
 679                 break;
 680         case NETDEV_UP:
 681         case NETDEV_DOWN:
 682                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
 683                 break;
 684         case NETDEV_CHANGE:
 685         case NETDEV_GOING_DOWN:
 686                 break;
 687         default:
 688                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 689                 break;
 690         }
 691         return NOTIFY_DONE;
 692 }
 693
 694 static struct notifier_block rtnetlink_dev_notifier = {
 695         .notifier_call  = rtnetlink_event,
 696 };
 697
 698 void __init rtnetlink_init(void)
 699 {
 700         int i;
 701
 702         rtattr_max = 0;
 703         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
 704                 if (rta_max[i] > rtattr_max)
 705                         rtattr_max = rta_max[i];
 706         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
 707         if (!rta_buf)
 708                 panic("rtnetlink_init: cannot allocate rta_buf\n");
 709
 710         rtnl = netlink_kernel_create(NETLINK_ROUTE, rtnetlink_rcv);
 711         if (rtnl == NULL)
 712                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
 713         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
 714         register_netdevice_notifier(&rtnetlink_dev_notifier);
 715         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
 716         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
 717 }
 718
 719 EXPORT_SYMBOL(__rta_fill);
 720 EXPORT_SYMBOL(rtattr_strlcpy);
 721 EXPORT_SYMBOL(rtattr_parse);
 722 EXPORT_SYMBOL(rtnetlink_links);
 723 EXPORT_SYMBOL(rtnetlink_put_metrics);
 724 EXPORT_SYMBOL(rtnl);
 725 EXPORT_SYMBOL(rtnl_lock);
 726 EXPORT_SYMBOL(rtnl_lock_interruptible);
 727 EXPORT_SYMBOL(rtnl_sem);
 728 EXPORT_SYMBOL(rtnl_unlock);