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
  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 #include <net/netlink.h>
  53 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
  54 #include <linux/wireless.h>
  55 #include <net/iw_handler.h>
  56 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
  57
  58 static DEFINE_MUTEX(rtnl_mutex);
  59
  60 void rtnl_lock(void)
  61 {
  62         mutex_lock(&rtnl_mutex);
  63 }
  64
  65 void __rtnl_unlock(void)
  66 {
  67         mutex_unlock(&rtnl_mutex);
  68 }
  69
  70 void rtnl_unlock(void)
  71 {
  72         mutex_unlock(&rtnl_mutex);
  73         if (rtnl && rtnl->sk_receive_queue.qlen)
  74                 rtnl->sk_data_ready(rtnl, 0);
  75         netdev_run_todo();
  76 }
  77
  78 int rtnl_trylock(void)
  79 {
  80         return mutex_trylock(&rtnl_mutex);
  81 }
  82
  83 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
  84 {
  85         memset(tb, 0, sizeof(struct rtattr*)*maxattr);
  86
  87         while (RTA_OK(rta, len)) {
  88                 unsigned flavor = rta->rta_type;
  89                 if (flavor && flavor <= maxattr)
  90                         tb[flavor-1] = rta;
  91                 rta = RTA_NEXT(rta, len);
  92         }
  93         return 0;
  94 }
  95
  96 struct sock *rtnl;
  97
  98 struct rtnetlink_link * rtnetlink_links[NPROTO];
  99
 100 static const int rtm_min[RTM_NR_FAMILIES] =
 101 {
 102         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 103         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
 104         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
 105         [RTM_FAM(RTM_NEWNEIGH)]     = NLMSG_LENGTH(sizeof(struct ndmsg)),
 106         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct rtmsg)),
 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         [RTM_FAM(RTM_NEWNEIGHTBL)]  = NLMSG_LENGTH(sizeof(struct ndtmsg)),
 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_NEWNEIGH)]     = NDA_MAX,
 123         [RTM_FAM(RTM_NEWRULE)]      = RTA_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 int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 220                                  int type, u32 pid, u32 seq, u32 change,
 221                                  unsigned int flags)
 222 {
 223         struct ifinfomsg *r;
 224         struct nlmsghdr  *nlh;
 225         unsigned char    *b = skb->tail;
 226
 227         nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags);
 228         r = NLMSG_DATA(nlh);
 229         r->ifi_family = AF_UNSPEC;
 230         r->__ifi_pad = 0;
 231         r->ifi_type = dev->type;
 232         r->ifi_index = dev->ifindex;
 233         r->ifi_flags = dev_get_flags(dev);
 234         r->ifi_change = change;
 235
 236         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
 237
 238         if (1) {
 239                 u32 txqlen = dev->tx_queue_len;
 240                 RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
 241         }
 242
 243         if (1) {
 244                 u32 weight = dev->weight;
 245                 RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
 246         }
 247
 248         if (1) {
 249                 u8 operstate = netif_running(dev)?dev->operstate:IF_OPER_DOWN;
 250                 u8 link_mode = dev->link_mode;
 251                 RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate);
 252                 RTA_PUT(skb, IFLA_LINKMODE, sizeof(link_mode), &link_mode);
 253         }
 254
 255         if (1) {
 256                 struct rtnl_link_ifmap map = {
 257                         .mem_start   = dev->mem_start,
 258                         .mem_end     = dev->mem_end,
 259                         .base_addr   = dev->base_addr,
 260                         .irq         = dev->irq,
 261                         .dma         = dev->dma,
 262                         .port        = dev->if_port,
 263                 };
 264                 RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 265         }
 266
 267         if (dev->addr_len) {
 268                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 269                 RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 270         }
 271
 272         if (1) {
 273                 u32 mtu = dev->mtu;
 274                 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
 275         }
 276
 277         if (dev->ifindex != dev->iflink) {
 278                 u32 iflink = dev->iflink;
 279                 RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
 280         }
 281
 282         if (dev->qdisc_sleeping)
 283                 RTA_PUT(skb, IFLA_QDISC,
 284                         strlen(dev->qdisc_sleeping->ops->id) + 1,
 285                         dev->qdisc_sleeping->ops->id);
 286
 287         if (dev->master) {
 288                 u32 master = dev->master->ifindex;
 289                 RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
 290         }
 291
 292         if (dev->get_stats) {
 293                 unsigned long *stats = (unsigned long*)dev->get_stats(dev);
 294                 if (stats) {
 295                         struct rtattr  *a;
 296                         __u32          *s;
 297                         int             i;
 298                         int             n = sizeof(struct rtnl_link_stats)/4;
 299
 300                         a = __RTA_PUT(skb, IFLA_STATS, n*4);
 301                         s = RTA_DATA(a);
 302                         for (i=0; i<n; i++)
 303                                 s[i] = stats[i];
 304                 }
 305         }
 306         nlh->nlmsg_len = skb->tail - b;
 307         return skb->len;
 308
 309 nlmsg_failure:
 310 rtattr_failure:
 311         skb_trim(skb, b - skb->data);
 312         return -1;
 313 }
 314
 315 static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 316 {
 317         int idx;
 318         int s_idx = cb->args[0];
 319         struct net_device *dev;
 320
 321         read_lock(&dev_base_lock);
 322         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 323                 if (idx < s_idx)
 324                         continue;
 325                 if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK,
 326                                           NETLINK_CB(cb->skb).pid,
 327                                           cb->nlh->nlmsg_seq, 0,
 328                                           NLM_F_MULTI) <= 0)
 329                         break;
 330         }
 331         read_unlock(&dev_base_lock);
 332         cb->args[0] = idx;
 333
 334         return skb->len;
 335 }
 336
 337 static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 338 {
 339         struct ifinfomsg  *ifm = NLMSG_DATA(nlh);
 340         struct rtattr    **ida = arg;
 341         struct net_device *dev;
 342         int err, send_addr_notify = 0;
 343
 344         if (ifm->ifi_index >= 0)
 345                 dev = dev_get_by_index(ifm->ifi_index);
 346         else if (ida[IFLA_IFNAME - 1]) {
 347                 char ifname[IFNAMSIZ];
 348
 349                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 350                                    IFNAMSIZ) >= IFNAMSIZ)
 351                         return -EINVAL;
 352                 dev = dev_get_by_name(ifname);
 353         } else
 354                 return -EINVAL;
 355
 356         if (!dev)
 357                 return -ENODEV;
 358
 359         err = -EINVAL;
 360
 361         if (ifm->ifi_flags)
 362                 dev_change_flags(dev, ifm->ifi_flags);
 363
 364         if (ida[IFLA_MAP - 1]) {
 365                 struct rtnl_link_ifmap *u_map;
 366                 struct ifmap k_map;
 367
 368                 if (!dev->set_config) {
 369                         err = -EOPNOTSUPP;
 370                         goto out;
 371                 }
 372
 373                 if (!netif_device_present(dev)) {
 374                         err = -ENODEV;
 375                         goto out;
 376                 }
 377
 378                 if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
 379                         goto out;
 380
 381                 u_map = RTA_DATA(ida[IFLA_MAP - 1]);
 382
 383                 k_map.mem_start = (unsigned long) u_map->mem_start;
 384                 k_map.mem_end = (unsigned long) u_map->mem_end;
 385                 k_map.base_addr = (unsigned short) u_map->base_addr;
 386                 k_map.irq = (unsigned char) u_map->irq;
 387                 k_map.dma = (unsigned char) u_map->dma;
 388                 k_map.port = (unsigned char) u_map->port;
 389
 390                 err = dev->set_config(dev, &k_map);
 391
 392                 if (err)
 393                         goto out;
 394         }
 395
 396         if (ida[IFLA_ADDRESS - 1]) {
 397                 struct sockaddr *sa;
 398                 int len;
 399
 400                 if (!dev->set_mac_address) {
 401                         err = -EOPNOTSUPP;
 402                         goto out;
 403                 }
 404                 if (!netif_device_present(dev)) {
 405                         err = -ENODEV;
 406                         goto out;
 407                 }
 408                 if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 409                         goto out;
 410
 411                 len = sizeof(sa_family_t) + dev->addr_len;
 412                 sa = kmalloc(len, GFP_KERNEL);
 413                 if (!sa) {
 414                         err = -ENOMEM;
 415                         goto out;
 416                 }
 417                 sa->sa_family = dev->type;
 418                 memcpy(sa->sa_data, RTA_DATA(ida[IFLA_ADDRESS - 1]),
 419                        dev->addr_len);
 420                 err = dev->set_mac_address(dev, sa);
 421                 kfree(sa);
 422                 if (err)
 423                         goto out;
 424                 send_addr_notify = 1;
 425         }
 426
 427         if (ida[IFLA_BROADCAST - 1]) {
 428                 if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 429                         goto out;
 430                 memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
 431                        dev->addr_len);
 432                 send_addr_notify = 1;
 433         }
 434
 435         if (ida[IFLA_MTU - 1]) {
 436                 if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 437                         goto out;
 438                 err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
 439
 440                 if (err)
 441                         goto out;
 442
 443         }
 444
 445         if (ida[IFLA_TXQLEN - 1]) {
 446                 if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 447                         goto out;
 448
 449                 dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
 450         }
 451
 452         if (ida[IFLA_WEIGHT - 1]) {
 453                 if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 454                         goto out;
 455
 456                 dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
 457         }
 458
 459         if (ida[IFLA_OPERSTATE - 1]) {
 460                 if (ida[IFLA_OPERSTATE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
 461                         goto out;
 462
 463                 set_operstate(dev, *((u8 *) RTA_DATA(ida[IFLA_OPERSTATE - 1])));
 464         }
 465
 466         if (ida[IFLA_LINKMODE - 1]) {
 467                 if (ida[IFLA_LINKMODE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
 468                         goto out;
 469
 470                 write_lock_bh(&dev_base_lock);
 471                 dev->link_mode = *((u8 *) RTA_DATA(ida[IFLA_LINKMODE - 1]));
 472                 write_unlock_bh(&dev_base_lock);
 473         }
 474
 475         if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
 476                 char ifname[IFNAMSIZ];
 477
 478                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 479                                    IFNAMSIZ) >= IFNAMSIZ)
 480                         goto out;
 481                 err = dev_change_name(dev, ifname);
 482                 if (err)
 483                         goto out;
 484         }
 485
 486 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 487         if (ida[IFLA_WIRELESS - 1]) {
 488
 489                 /* Call Wireless Extensions.
 490                  * Various stuff checked in there... */
 491                 err = wireless_rtnetlink_set(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len);
 492                 if (err)
 493                         goto out;
 494         }
 495 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 496
 497         err = 0;
 498
 499 out:
 500         if (send_addr_notify)
 501                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 502
 503         dev_put(dev);
 504         return err;
 505 }
 506
 507 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 508 static int do_getlink(struct sk_buff *in_skb, struct nlmsghdr* in_nlh, void *arg)
 509 {
 510         struct ifinfomsg  *ifm = NLMSG_DATA(in_nlh);
 511         struct rtattr    **ida = arg;
 512         struct net_device *dev;
 513         struct ifinfomsg *r;
 514         struct nlmsghdr  *nlh;
 515         int err = -ENOBUFS;
 516         struct sk_buff *skb;
 517         unsigned char    *b;
 518         char *iw_buf = NULL;
 519         int iw_buf_len = 0;
 520
 521         if (ifm->ifi_index >= 0)
 522                 dev = dev_get_by_index(ifm->ifi_index);
 523         else
 524                 return -EINVAL;
 525         if (!dev)
 526                 return -ENODEV;
 527
 528 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 529         if (ida[IFLA_WIRELESS - 1]) {
 530
 531                 /* Call Wireless Extensions. We need to know the size before
 532                  * we can alloc. Various stuff checked in there... */
 533                 err = wireless_rtnetlink_get(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len, &iw_buf, &iw_buf_len);
 534                 if (err)
 535                         goto out;
 536         }
 537 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 538
 539         /* Create a skb big enough to include all the data.
 540          * Some requests are way bigger than 4k... Jean II */
 541         skb = alloc_skb((NLMSG_LENGTH(sizeof(*r))) + (RTA_SPACE(iw_buf_len)),
 542                         GFP_KERNEL);
 543         if (!skb)
 544                 goto out;
 545         b = skb->tail;
 546
 547         /* Put in the message the usual good stuff */
 548         nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, in_nlh->nlmsg_seq,
 549                         RTM_NEWLINK, sizeof(*r));
 550         r = NLMSG_DATA(nlh);
 551         r->ifi_family = AF_UNSPEC;
 552         r->__ifi_pad = 0;
 553         r->ifi_type = dev->type;
 554         r->ifi_index = dev->ifindex;
 555         r->ifi_flags = dev->flags;
 556         r->ifi_change = 0;
 557
 558         /* Put the wireless payload if it exist */
 559         if(iw_buf != NULL)
 560                 RTA_PUT(skb, IFLA_WIRELESS, iw_buf_len,
 561                         iw_buf + IW_EV_POINT_OFF);
 562
 563         nlh->nlmsg_len = skb->tail - b;
 564
 565         /* Needed ? */
 566         NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
 567
 568         err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
 569         if (err > 0)
 570                 err = 0;
 571 out:
 572         if(iw_buf != NULL)
 573                 kfree(iw_buf);
 574         dev_put(dev);
 575         return err;
 576
 577 rtattr_failure:
 578 nlmsg_failure:
 579         kfree_skb(skb);
 580         goto out;
 581 }
 582 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 583
 584 static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 585 {
 586         int idx;
 587         int s_idx = cb->family;
 588
 589         if (s_idx == 0)
 590                 s_idx = 1;
 591         for (idx=1; idx<NPROTO; idx++) {
 592                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 593                 if (idx < s_idx || idx == PF_PACKET)
 594                         continue;
 595                 if (rtnetlink_links[idx] == NULL ||
 596                     rtnetlink_links[idx][type].dumpit == NULL)
 597                         continue;
 598                 if (idx > s_idx)
 599                         memset(&cb->args[0], 0, sizeof(cb->args));
 600                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 601                         break;
 602         }
 603         cb->family = idx;
 604
 605         return skb->len;
 606 }
 607
 608 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 609 {
 610         struct sk_buff *skb;
 611         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
 612                                sizeof(struct rtnl_link_ifmap) +
 613                                sizeof(struct rtnl_link_stats) + 128);
 614
 615         skb = alloc_skb(size, GFP_KERNEL);
 616         if (!skb)
 617                 return;
 618
 619         if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) {
 620                 kfree_skb(skb);
 621                 return;
 622         }
 623         NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
 624         netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
 625 }
 626
 627 /* Protected by RTNL sempahore.  */
 628 static struct rtattr **rta_buf;
 629 static int rtattr_max;
 630
 631 /* Process one rtnetlink message. */
 632
 633 static __inline__ int
 634 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 635 {
 636         struct rtnetlink_link *link;
 637         struct rtnetlink_link *link_tab;
 638         int sz_idx, kind;
 639         int min_len;
 640         int family;
 641         int type;
 642         int err;
 643
 644         /* Only requests are handled by kernel now */
 645         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 646                 return 0;
 647
 648         type = nlh->nlmsg_type;
 649
 650         /* A control message: ignore them */
 651         if (type < RTM_BASE)
 652                 return 0;
 653
 654         /* Unknown message: reply with EINVAL */
 655         if (type > RTM_MAX)
 656                 goto err_inval;
 657
 658         type -= RTM_BASE;
 659
 660         /* All the messages must have at least 1 byte length */
 661         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
 662                 return 0;
 663
 664         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
 665         if (family >= NPROTO) {
 666                 *errp = -EAFNOSUPPORT;
 667                 return -1;
 668         }
 669
 670         link_tab = rtnetlink_links[family];
 671         if (link_tab == NULL)
 672                 link_tab = rtnetlink_links[PF_UNSPEC];
 673         link = &link_tab[type];
 674
 675         sz_idx = type>>2;
 676         kind = type&3;
 677
 678         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
 679                 *errp = -EPERM;
 680                 return -1;
 681         }
 682
 683         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 684                 if (link->dumpit == NULL)
 685                         link = &(rtnetlink_links[PF_UNSPEC][type]);
 686
 687                 if (link->dumpit == NULL)
 688                         goto err_inval;
 689
 690                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
 691                                                 link->dumpit, NULL)) != 0) {
 692                         return -1;
 693                 }
 694
 695                 netlink_queue_skip(nlh, skb);
 696                 return -1;
 697         }
 698
 699         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
 700
 701         min_len = rtm_min[sz_idx];
 702         if (nlh->nlmsg_len < min_len)
 703                 goto err_inval;
 704
 705         if (nlh->nlmsg_len > min_len) {
 706                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
 707                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
 708
 709                 while (RTA_OK(attr, attrlen)) {
 710                         unsigned flavor = attr->rta_type;
 711                         if (flavor) {
 712                                 if (flavor > rta_max[sz_idx])
 713                                         goto err_inval;
 714                                 rta_buf[flavor-1] = attr;
 715                         }
 716                         attr = RTA_NEXT(attr, attrlen);
 717                 }
 718         }
 719
 720         if (link->doit == NULL)
 721                 link = &(rtnetlink_links[PF_UNSPEC][type]);
 722         if (link->doit == NULL)
 723                 goto err_inval;
 724         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
 725
 726         *errp = err;
 727         return err;
 728
 729 err_inval:
 730         *errp = -EINVAL;
 731         return -1;
 732 }
 733
 734 static void rtnetlink_rcv(struct sock *sk, int len)
 735 {
 736         unsigned int qlen = 0;
 737
 738         do {
 739                 mutex_lock(&rtnl_mutex);
 740                 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
 741                 mutex_unlock(&rtnl_mutex);
 742
 743                 netdev_run_todo();
 744         } while (qlen);
 745 }
 746
 747 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 748 {
 749         [RTM_GETLINK     - RTM_BASE] = {
 750 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 751                                          .doit   = do_getlink,
 752 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 753                                          .dumpit = rtnetlink_dump_ifinfo },
 754         [RTM_SETLINK     - RTM_BASE] = { .doit   = do_setlink            },
 755         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 756         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnetlink_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         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 761         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
 762         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
 763 };
 764
 765 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 766 {
 767         struct net_device *dev = ptr;
 768         switch (event) {
 769         case NETDEV_UNREGISTER:
 770                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 771                 break;
 772         case NETDEV_REGISTER:
 773                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
 774                 break;
 775         case NETDEV_UP:
 776         case NETDEV_DOWN:
 777                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
 778                 break;
 779         case NETDEV_CHANGE:
 780         case NETDEV_GOING_DOWN:
 781                 break;
 782         default:
 783                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 784                 break;
 785         }
 786         return NOTIFY_DONE;
 787 }
 788
 789 static struct notifier_block rtnetlink_dev_notifier = {
 790         .notifier_call  = rtnetlink_event,
 791 };
 792
 793 void __init rtnetlink_init(void)
 794 {
 795         int i;
 796
 797         rtattr_max = 0;
 798         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
 799                 if (rta_max[i] > rtattr_max)
 800                         rtattr_max = rta_max[i];
 801         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
 802         if (!rta_buf)
 803                 panic("rtnetlink_init: cannot allocate rta_buf\n");
 804
 805         rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
 806                                      THIS_MODULE);
 807         if (rtnl == NULL)
 808                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
 809         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
 810         register_netdevice_notifier(&rtnetlink_dev_notifier);
 811         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
 812         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
 813 }
 814
 815 EXPORT_SYMBOL(__rta_fill);
 816 EXPORT_SYMBOL(rtattr_strlcpy);
 817 EXPORT_SYMBOL(rtattr_parse);
 818 EXPORT_SYMBOL(rtnetlink_links);
 819 EXPORT_SYMBOL(rtnetlink_put_metrics);
 820 EXPORT_SYMBOL(rtnl);
 821 EXPORT_SYMBOL(rtnl_lock);
 822 EXPORT_SYMBOL(rtnl_trylock);
 823 EXPORT_SYMBOL(rtnl_unlock);