SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/core/rtnetlink.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Routing netlink socket interface: protocol independent part.
   7  *
   8  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   9  *
  10  *              This program is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  *
  15  *      Fixes:
  16  *      Vitaly E. Lavrov                RTA_OK arithmetics was wrong.
  17  */
  18
  19 #include <linux/errno.h>
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/socket.h>
  23 #include <linux/kernel.h>
  24 #include <linux/sched.h>
  25 #include <linux/timer.h>
  26 #include <linux/string.h>
  27 #include <linux/sockios.h>
  28 #include <linux/net.h>
  29 #include <linux/fcntl.h>
  30 #include <linux/mm.h>
  31 #include <linux/slab.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/capability.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/init.h>
  36 #include <linux/security.h>
  37 #include <linux/mutex.h>
  38 #include <linux/if_addr.h>
  39
  40 #include <asm/uaccess.h>
  41 #include <asm/system.h>
  42 #include <asm/string.h>
  43
  44 #include <linux/inet.h>
  45 #include <linux/netdevice.h>
  46 #include <net/ip.h>
  47 #include <net/protocol.h>
  48 #include <net/arp.h>
  49 #include <net/route.h>
  50 #include <net/udp.h>
  51 #include <net/sock.h>
  52 #include <net/pkt_sched.h>
  53 #include <net/fib_rules.h>
  54 #include <net/netlink.h>
  55 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
  56 #include <linux/wireless.h>
  57 #include <net/iw_handler.h>
  58 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
  59
  60 static DEFINE_MUTEX(rtnl_mutex);
  61
  62 void rtnl_lock(void)
  63 {
  64         mutex_lock(&rtnl_mutex);
  65 }
  66
  67 void __rtnl_unlock(void)
  68 {
  69         mutex_unlock(&rtnl_mutex);
  70 }
  71
  72 void rtnl_unlock(void)
  73 {
  74         mutex_unlock(&rtnl_mutex);
  75         if (rtnl && rtnl->sk_receive_queue.qlen)
  76                 rtnl->sk_data_ready(rtnl, 0);
  77         netdev_run_todo();
  78 }
  79
  80 int rtnl_trylock(void)
  81 {
  82         return mutex_trylock(&rtnl_mutex);
  83 }
  84
  85 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
  86 {
  87         memset(tb, 0, sizeof(struct rtattr*)*maxattr);
  88
  89         while (RTA_OK(rta, len)) {
  90                 unsigned flavor = rta->rta_type;
  91                 if (flavor && flavor <= maxattr)
  92                         tb[flavor-1] = rta;
  93                 rta = RTA_NEXT(rta, len);
  94         }
  95         return 0;
  96 }
  97
  98 struct sock *rtnl;
  99
 100 struct rtnetlink_link * rtnetlink_links[NPROTO];
 101
 102 static const int rtm_min[RTM_NR_FAMILIES] =
 103 {
 104         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 105         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
 106         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
 107         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
 108         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
 109         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
 110         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
 111         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
 112         [RTM_FAM(RTM_NEWPREFIX)]    = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 113         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 114         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 115 };
 116
 117 static const int rta_max[RTM_NR_FAMILIES] =
 118 {
 119         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 120         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 121         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 122         [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
 123         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 124         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 125         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 126         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 127 };
 128
 129 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 130 {
 131         struct rtattr *rta;
 132         int size = RTA_LENGTH(attrlen);
 133
 134         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
 135         rta->rta_type = attrtype;
 136         rta->rta_len = size;
 137         memcpy(RTA_DATA(rta), data, attrlen);
 138         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 139 }
 140
 141 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
 142 {
 143         size_t ret = RTA_PAYLOAD(rta);
 144         char *src = RTA_DATA(rta);
 145
 146         if (ret > 0 && src[ret - 1] == '\0')
 147                 ret--;
 148         if (size > 0) {
 149                 size_t len = (ret >= size) ? size - 1 : ret;
 150                 memset(dest, 0, size);
 151                 memcpy(dest, src, len);
 152         }
 153         return ret;
 154 }
 155
 156 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
 157 {
 158         int err = 0;
 159
 160         NETLINK_CB(skb).dst_group = group;
 161         if (echo)
 162                 atomic_inc(&skb->users);
 163         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 164         if (echo)
 165                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 166         return err;
 167 }
 168
 169 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 170 {
 171         struct rtattr *mx = (struct rtattr*)skb->tail;
 172         int i;
 173
 174         RTA_PUT(skb, RTA_METRICS, 0, NULL);
 175         for (i=0; i<RTAX_MAX; i++) {
 176                 if (metrics[i])
 177                         RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
 178         }
 179         mx->rta_len = skb->tail - (u8*)mx;
 180         if (mx->rta_len == RTA_LENGTH(0))
 181                 skb_trim(skb, (u8*)mx - skb->data);
 182         return 0;
 183
 184 rtattr_failure:
 185         skb_trim(skb, (u8*)mx - skb->data);
 186         return -1;
 187 }
 188
 189
 190 static void set_operstate(struct net_device *dev, unsigned char transition)
 191 {
 192         unsigned char operstate = dev->operstate;
 193
 194         switch(transition) {
 195         case IF_OPER_UP:
 196                 if ((operstate == IF_OPER_DORMANT ||
 197                      operstate == IF_OPER_UNKNOWN) &&
 198                     !netif_dormant(dev))
 199                         operstate = IF_OPER_UP;
 200                 break;
 201
 202         case IF_OPER_DORMANT:
 203                 if (operstate == IF_OPER_UP ||
 204                     operstate == IF_OPER_UNKNOWN)
 205                         operstate = IF_OPER_DORMANT;
 206                 break;
 207         };
 208
 209         if (dev->operstate != operstate) {
 210                 write_lock_bh(&dev_base_lock);
 211                 dev->operstate = operstate;
 212                 write_unlock_bh(&dev_base_lock);
 213                 netdev_state_change(dev);
 214         }
 215 }
 216
 217 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 218                                  struct net_device_stats *b)
 219 {
 220         a->rx_packets = b->rx_packets;
 221         a->tx_packets = b->tx_packets;
 222         a->rx_bytes = b->rx_bytes;
 223         a->tx_bytes = b->tx_bytes;
 224         a->rx_errors = b->rx_errors;
 225         a->tx_errors = b->tx_errors;
 226         a->rx_dropped = b->rx_dropped;
 227         a->tx_dropped = b->tx_dropped;
 228
 229         a->multicast = b->multicast;
 230         a->collisions = b->collisions;
 231
 232         a->rx_length_errors = b->rx_length_errors;
 233         a->rx_over_errors = b->rx_over_errors;
 234         a->rx_crc_errors = b->rx_crc_errors;
 235         a->rx_frame_errors = b->rx_frame_errors;
 236         a->rx_fifo_errors = b->rx_fifo_errors;
 237         a->rx_missed_errors = b->rx_missed_errors;
 238
 239         a->tx_aborted_errors = b->tx_aborted_errors;
 240         a->tx_carrier_errors = b->tx_carrier_errors;
 241         a->tx_fifo_errors = b->tx_fifo_errors;
 242         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 243         a->tx_window_errors = b->tx_window_errors;
 244
 245         a->rx_compressed = b->rx_compressed;
 246         a->tx_compressed = b->tx_compressed;
 247 };
 248
 249 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 250                             void *iwbuf, int iwbuflen, int type, u32 pid,
 251                             u32 seq, u32 change, unsigned int flags)
 252 {
 253         struct ifinfomsg *ifm;
 254         struct nlmsghdr *nlh;
 255
 256         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 257         if (nlh == NULL)
 258                 return -ENOBUFS;
 259
 260         ifm = nlmsg_data(nlh);
 261         ifm->ifi_family = AF_UNSPEC;
 262         ifm->__ifi_pad = 0;
 263         ifm->ifi_type = dev->type;
 264         ifm->ifi_index = dev->ifindex;
 265         ifm->ifi_flags = dev_get_flags(dev);
 266         ifm->ifi_change = change;
 267
 268         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 269         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
 270         NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
 271         NLA_PUT_U8(skb, IFLA_OPERSTATE,
 272                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
 273         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
 274         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
 275
 276         if (dev->ifindex != dev->iflink)
 277                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
 278
 279         if (dev->master)
 280                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
 281
 282         if (dev->qdisc_sleeping)
 283                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
 284
 285         if (1) {
 286                 struct rtnl_link_ifmap map = {
 287                         .mem_start   = dev->mem_start,
 288                         .mem_end     = dev->mem_end,
 289                         .base_addr   = dev->base_addr,
 290                         .irq         = dev->irq,
 291                         .dma         = dev->dma,
 292                         .port        = dev->if_port,
 293                 };
 294                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 295         }
 296
 297         if (dev->addr_len) {
 298                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 299                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 300         }
 301
 302         if (dev->get_stats) {
 303                 struct net_device_stats *stats = dev->get_stats(dev);
 304                 if (stats) {
 305                         struct nlattr *attr;
 306
 307                         attr = nla_reserve(skb, IFLA_STATS,
 308                                            sizeof(struct rtnl_link_stats));
 309                         if (attr == NULL)
 310                                 goto nla_put_failure;
 311
 312                         copy_rtnl_link_stats(nla_data(attr), stats);
 313                 }
 314         }
 315
 316         if (iwbuf)
 317                 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
 318
 319         return nlmsg_end(skb, nlh);
 320
 321 nla_put_failure:
 322         return nlmsg_cancel(skb, nlh);
 323 }
 324
 325 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 326 {
 327         int idx;
 328         int s_idx = cb->args[0];
 329         struct net_device *dev;
 330
 331         read_lock(&dev_base_lock);
 332         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 333                 if (idx < s_idx)
 334                         continue;
 335                 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
 336                                      NETLINK_CB(cb->skb).pid,
 337                                      cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
 338                         break;
 339         }
 340         read_unlock(&dev_base_lock);
 341         cb->args[0] = idx;
 342
 343         return skb->len;
 344 }
 345
 346 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
 347         [IFLA_IFNAME]           = { .type = NLA_STRING },
 348         [IFLA_MAP]              = { .minlen = sizeof(struct rtnl_link_ifmap) },
 349         [IFLA_MTU]              = { .type = NLA_U32 },
 350         [IFLA_TXQLEN]           = { .type = NLA_U32 },
 351         [IFLA_WEIGHT]           = { .type = NLA_U32 },
 352         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
 353         [IFLA_LINKMODE]         = { .type = NLA_U8 },
 354 };
 355
 356 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 357 {
 358         struct ifinfomsg *ifm;
 359         struct net_device *dev;
 360         int err, send_addr_notify = 0, modified = 0;
 361         struct nlattr *tb[IFLA_MAX+1];
 362         char ifname[IFNAMSIZ];
 363
 364         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 365         if (err < 0)
 366                 goto errout;
 367
 368         if (tb[IFLA_IFNAME] &&
 369             nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ) >= IFNAMSIZ)
 370                 return -EINVAL;
 371
 372         err = -EINVAL;
 373         ifm = nlmsg_data(nlh);
 374         if (ifm->ifi_index >= 0)
 375                 dev = dev_get_by_index(ifm->ifi_index);
 376         else if (tb[IFLA_IFNAME])
 377                 dev = dev_get_by_name(ifname);
 378         else
 379                 goto errout;
 380
 381         if (dev == NULL) {
 382                 err = -ENODEV;
 383                 goto errout;
 384         }
 385
 386         if (tb[IFLA_ADDRESS] &&
 387             nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
 388                 goto errout_dev;
 389
 390         if (tb[IFLA_BROADCAST] &&
 391             nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
 392                 goto errout_dev;
 393
 394         if (tb[IFLA_MAP]) {
 395                 struct rtnl_link_ifmap *u_map;
 396                 struct ifmap k_map;
 397
 398                 if (!dev->set_config) {
 399                         err = -EOPNOTSUPP;
 400                         goto errout_dev;
 401                 }
 402
 403                 if (!netif_device_present(dev)) {
 404                         err = -ENODEV;
 405                         goto errout_dev;
 406                 }
 407
 408                 u_map = nla_data(tb[IFLA_MAP]);
 409                 k_map.mem_start = (unsigned long) u_map->mem_start;
 410                 k_map.mem_end = (unsigned long) u_map->mem_end;
 411                 k_map.base_addr = (unsigned short) u_map->base_addr;
 412                 k_map.irq = (unsigned char) u_map->irq;
 413                 k_map.dma = (unsigned char) u_map->dma;
 414                 k_map.port = (unsigned char) u_map->port;
 415
 416                 err = dev->set_config(dev, &k_map);
 417                 if (err < 0)
 418                         goto errout_dev;
 419
 420                 modified = 1;
 421         }
 422
 423         if (tb[IFLA_ADDRESS]) {
 424                 struct sockaddr *sa;
 425                 int len;
 426
 427                 if (!dev->set_mac_address) {
 428                         err = -EOPNOTSUPP;
 429                         goto errout_dev;
 430                 }
 431
 432                 if (!netif_device_present(dev)) {
 433                         err = -ENODEV;
 434                         goto errout_dev;
 435                 }
 436
 437                 len = sizeof(sa_family_t) + dev->addr_len;
 438                 sa = kmalloc(len, GFP_KERNEL);
 439                 if (!sa) {
 440                         err = -ENOMEM;
 441                         goto errout_dev;
 442                 }
 443                 sa->sa_family = dev->type;
 444                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
 445                        dev->addr_len);
 446                 err = dev->set_mac_address(dev, sa);
 447                 kfree(sa);
 448                 if (err)
 449                         goto errout_dev;
 450                 send_addr_notify = 1;
 451                 modified = 1;
 452         }
 453
 454         if (tb[IFLA_MTU]) {
 455                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
 456                 if (err < 0)
 457                         goto errout_dev;
 458                 modified = 1;
 459         }
 460
 461         /*
 462          * Interface selected by interface index but interface
 463          * name provided implies that a name change has been
 464          * requested.
 465          */
 466         if (ifm->ifi_index >= 0 && ifname[0]) {
 467                 err = dev_change_name(dev, ifname);
 468                 if (err < 0)
 469                         goto errout_dev;
 470                 modified = 1;
 471         }
 472
 473 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 474         if (tb[IFLA_WIRELESS]) {
 475                 /* Call Wireless Extensions.
 476                  * Various stuff checked in there... */
 477                 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
 478                                              nla_len(tb[IFLA_WIRELESS]));
 479                 if (err < 0)
 480                         goto errout_dev;
 481         }
 482 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 483
 484         if (tb[IFLA_BROADCAST]) {
 485                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
 486                 send_addr_notify = 1;
 487         }
 488
 489
 490         if (ifm->ifi_flags)
 491                 dev_change_flags(dev, ifm->ifi_flags);
 492
 493         if (tb[IFLA_TXQLEN])
 494                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
 495
 496         if (tb[IFLA_WEIGHT])
 497                 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
 498
 499         if (tb[IFLA_OPERSTATE])
 500                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 501
 502         if (tb[IFLA_LINKMODE]) {
 503                 write_lock_bh(&dev_base_lock);
 504                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
 505                 write_unlock_bh(&dev_base_lock);
 506         }
 507
 508         err = 0;
 509
 510 errout_dev:
 511         if (err < 0 && modified && net_ratelimit())
 512                 printk(KERN_WARNING "A link change request failed with "
 513                        "some changes comitted already. Interface %s may "
 514                        "have been left with an inconsistent configuration, "
 515                        "please check.\n", dev->name);
 516
 517         if (send_addr_notify)
 518                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 519
 520         dev_put(dev);
 521 errout:
 522         return err;
 523 }
 524
 525 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 526 {
 527         struct ifinfomsg *ifm;
 528         struct nlattr *tb[IFLA_MAX+1];
 529         struct net_device *dev = NULL;
 530         struct sk_buff *nskb;
 531         char *iw_buf = NULL, *iw = NULL;
 532         int iw_buf_len = 0;
 533         int err, payload;
 534
 535         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 536         if (err < 0)
 537                 goto errout;
 538
 539         ifm = nlmsg_data(nlh);
 540         if (ifm->ifi_index >= 0) {
 541                 dev = dev_get_by_index(ifm->ifi_index);
 542                 if (dev == NULL)
 543                         return -ENODEV;
 544         } else
 545                 return -EINVAL;
 546
 547
 548 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 549         if (tb[IFLA_WIRELESS]) {
 550                 /* Call Wireless Extensions. We need to know the size before
 551                  * we can alloc. Various stuff checked in there... */
 552                 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
 553                                              nla_len(tb[IFLA_WIRELESS]),
 554                                              &iw_buf, &iw_buf_len);
 555                 if (err < 0)
 556                         goto errout;
 557
 558                 iw += IW_EV_POINT_OFF;
 559         }
 560 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 561
 562         payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) +
 563                               nla_total_size(iw_buf_len));
 564         nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL);
 565         if (nskb == NULL) {
 566                 err = -ENOBUFS;
 567                 goto errout;
 568         }
 569
 570         err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
 571                                NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
 572         if (err <= 0) {
 573                 kfree_skb(skb);
 574                 goto errout;
 575         }
 576
 577         err = netlink_unicast(rtnl, skb, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 578         if (err > 0)
 579                 err = 0;
 580 errout:
 581         kfree(iw_buf);
 582         dev_put(dev);
 583
 584         return err;
 585 }
 586
 587 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 588 {
 589         int idx;
 590         int s_idx = cb->family;
 591
 592         if (s_idx == 0)
 593                 s_idx = 1;
 594         for (idx=1; idx<NPROTO; idx++) {
 595                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 596                 if (idx < s_idx || idx == PF_PACKET)
 597                         continue;
 598                 if (rtnetlink_links[idx] == NULL ||
 599                     rtnetlink_links[idx][type].dumpit == NULL)
 600                         continue;
 601                 if (idx > s_idx)
 602                         memset(&cb->args[0], 0, sizeof(cb->args));
 603                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 604                         break;
 605         }
 606         cb->family = idx;
 607
 608         return skb->len;
 609 }
 610
 611 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 612 {
 613         struct sk_buff *skb;
 614         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
 615                                sizeof(struct rtnl_link_ifmap) +
 616                                sizeof(struct rtnl_link_stats) + 128);
 617
 618         skb = nlmsg_new(size, GFP_KERNEL);
 619         if (!skb)
 620                 return;
 621
 622         if (rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0) < 0) {
 623                 kfree_skb(skb);
 624                 return;
 625         }
 626         NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
 627         netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
 628 }
 629
 630 /* Protected by RTNL sempahore.  */
 631 static struct rtattr **rta_buf;
 632 static int rtattr_max;
 633
 634 /* Process one rtnetlink message. */
 635
 636 static __inline__ int
 637 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 638 {
 639         struct rtnetlink_link *link;
 640         struct rtnetlink_link *link_tab;
 641         int sz_idx, kind;
 642         int min_len;
 643         int family;
 644         int type;
 645         int err;
 646
 647         /* Only requests are handled by kernel now */
 648         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 649                 return 0;
 650
 651         type = nlh->nlmsg_type;
 652
 653         /* A control message: ignore them */
 654         if (type < RTM_BASE)
 655                 return 0;
 656
 657         /* Unknown message: reply with EINVAL */
 658         if (type > RTM_MAX)
 659                 goto err_inval;
 660
 661         type -= RTM_BASE;
 662
 663         /* All the messages must have at least 1 byte length */
 664         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
 665                 return 0;
 666
 667         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
 668         if (family >= NPROTO) {
 669                 *errp = -EAFNOSUPPORT;
 670                 return -1;
 671         }
 672
 673         link_tab = rtnetlink_links[family];
 674         if (link_tab == NULL)
 675                 link_tab = rtnetlink_links[PF_UNSPEC];
 676         link = &link_tab[type];
 677
 678         sz_idx = type>>2;
 679         kind = type&3;
 680
 681         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
 682                 *errp = -EPERM;
 683                 return -1;
 684         }
 685
 686         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 687                 if (link->dumpit == NULL)
 688                         link = &(rtnetlink_links[PF_UNSPEC][type]);
 689
 690                 if (link->dumpit == NULL)
 691                         goto err_inval;
 692
 693                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
 694                                                 link->dumpit, NULL)) != 0) {
 695                         return -1;
 696                 }
 697
 698                 netlink_queue_skip(nlh, skb);
 699                 return -1;
 700         }
 701
 702         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
 703
 704         min_len = rtm_min[sz_idx];
 705         if (nlh->nlmsg_len < min_len)
 706                 goto err_inval;
 707
 708         if (nlh->nlmsg_len > min_len) {
 709                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
 710                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
 711
 712                 while (RTA_OK(attr, attrlen)) {
 713                         unsigned flavor = attr->rta_type;
 714                         if (flavor) {
 715                                 if (flavor > rta_max[sz_idx])
 716                                         goto err_inval;
 717                                 rta_buf[flavor-1] = attr;
 718                         }
 719                         attr = RTA_NEXT(attr, attrlen);
 720                 }
 721         }
 722
 723         if (link->doit == NULL)
 724                 link = &(rtnetlink_links[PF_UNSPEC][type]);
 725         if (link->doit == NULL)
 726                 goto err_inval;
 727         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
 728
 729         *errp = err;
 730         return err;
 731
 732 err_inval:
 733         *errp = -EINVAL;
 734         return -1;
 735 }
 736
 737 static void rtnetlink_rcv(struct sock *sk, int len)
 738 {
 739         unsigned int qlen = 0;
 740
 741         do {
 742                 mutex_lock(&rtnl_mutex);
 743                 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
 744                 mutex_unlock(&rtnl_mutex);
 745
 746                 netdev_run_todo();
 747         } while (qlen);
 748 }
 749
 750 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 751 {
 752         [RTM_GETLINK     - RTM_BASE] = { .doit   = rtnl_getlink,
 753                                          .dumpit = rtnl_dump_ifinfo      },
 754         [RTM_SETLINK     - RTM_BASE] = { .doit   = rtnl_setlink          },
 755         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 756         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 757         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
 758         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
 759         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
 760 #ifdef CONFIG_FIB_RULES
 761         [RTM_NEWRULE     - RTM_BASE] = { .doit   = fib_nl_newrule        },
 762         [RTM_DELRULE     - RTM_BASE] = { .doit   = fib_nl_delrule        },
 763 #endif
 764         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 765         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
 766         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
 767 };
 768
 769 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 770 {
 771         struct net_device *dev = ptr;
 772         switch (event) {
 773         case NETDEV_UNREGISTER:
 774                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 775                 break;
 776         case NETDEV_REGISTER:
 777                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
 778                 break;
 779         case NETDEV_UP:
 780         case NETDEV_DOWN:
 781                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
 782                 break;
 783         case NETDEV_CHANGE:
 784         case NETDEV_GOING_DOWN:
 785                 break;
 786         default:
 787                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 788                 break;
 789         }
 790         return NOTIFY_DONE;
 791 }
 792
 793 static struct notifier_block rtnetlink_dev_notifier = {
 794         .notifier_call  = rtnetlink_event,
 795 };
 796
 797 void __init rtnetlink_init(void)
 798 {
 799         int i;
 800
 801         rtattr_max = 0;
 802         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
 803                 if (rta_max[i] > rtattr_max)
 804                         rtattr_max = rta_max[i];
 805         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
 806         if (!rta_buf)
 807                 panic("rtnetlink_init: cannot allocate rta_buf\n");
 808
 809         rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
 810                                      THIS_MODULE);
 811         if (rtnl == NULL)
 812                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
 813         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
 814         register_netdevice_notifier(&rtnetlink_dev_notifier);
 815         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
 816         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
 817 }
 818
 819 EXPORT_SYMBOL(__rta_fill);
 820 EXPORT_SYMBOL(rtattr_strlcpy);
 821 EXPORT_SYMBOL(rtattr_parse);
 822 EXPORT_SYMBOL(rtnetlink_links);
 823 EXPORT_SYMBOL(rtnetlink_put_metrics);
 824 EXPORT_SYMBOL(rtnl);
 825 EXPORT_SYMBOL(rtnl_lock);
 826 EXPORT_SYMBOL(rtnl_trylock);
 827 EXPORT_SYMBOL(rtnl_unlock);