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