net/ipv4/devinet.c

   1 /*
   2  *      NET3    IP device support routines.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  *      Derived from the IP parts of dev.c 1.0.19
  10  *              Authors:        Ross Biro
  11  *                              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *                              Mark Evans, <evansmp@uhura.aston.ac.uk>
  13  *
  14  *      Additional Authors:
  15  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
  16  *              Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  17  *
  18  *      Changes:
  19  *              Alexey Kuznetsov:       pa_* fields are replaced with ifaddr
  20  *                                      lists.
  21  *              Cyrus Durgin:           updated for kmod
  22  *              Matthias Andree:        in devinet_ioctl, compare label and
  23  *                                      address (4.4BSD alias style support),
  24  *                                      fall back to comparing just the label
  25  *                                      if no match found.
  26  */
  27
  28
  29 #include <asm/uaccess.h>
  30 #include <linux/bitops.h>
  31 #include <linux/capability.h>
  32 #include <linux/module.h>
  33 #include <linux/types.h>
  34 #include <linux/kernel.h>
  35 #include <linux/string.h>
  36 #include <linux/mm.h>
  37 #include <linux/socket.h>
  38 #include <linux/sockios.h>
  39 #include <linux/in.h>
  40 #include <linux/errno.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/if_addr.h>
  43 #include <linux/if_ether.h>
  44 #include <linux/inet.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/etherdevice.h>
  47 #include <linux/skbuff.h>
  48 #include <linux/init.h>
  49 #include <linux/notifier.h>
  50 #include <linux/inetdevice.h>
  51 #include <linux/igmp.h>
  52 #include <linux/slab.h>
  53 #include <linux/hash.h>
  54 #ifdef CONFIG_SYSCTL
  55 #include <linux/sysctl.h>
  56 #endif
  57 #include <linux/kmod.h>
  58
  59 #include <net/arp.h>
  60 #include <net/ip.h>
  61 #include <net/route.h>
  62 #include <net/ip_fib.h>
  63 #include <net/rtnetlink.h>
  64 #include <net/net_namespace.h>
  65
  66 #include "fib_lookup.h"
  67
  68 static struct ipv4_devconf ipv4_devconf = {
  69         .data = {
  70                 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
  71                 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
  72                 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
  73                 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
  74         },
  75 };
  76
  77 static struct ipv4_devconf ipv4_devconf_dflt = {
  78         .data = {
  79                 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
  80                 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
  81                 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
  82                 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
  83                 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
  84         },
  85 };
  86
  87 #define IPV4_DEVCONF_DFLT(net, attr) \
  88         IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
  89
  90 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
  91         [IFA_LOCAL]             = { .type = NLA_U32 },
  92         [IFA_ADDRESS]           = { .type = NLA_U32 },
  93         [IFA_BROADCAST]         = { .type = NLA_U32 },
  94         [IFA_LABEL]             = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
  95 };
  96
  97 /* inet_addr_hash's shifting is dependent upon this IN4_ADDR_HSIZE
  98  * value.  So if you change this define, make appropriate changes to
  99  * inet_addr_hash as well.
 100  */
 101 #define IN4_ADDR_HSIZE  256
 102 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
 103 static DEFINE_SPINLOCK(inet_addr_hash_lock);
 104
 105 static inline unsigned int inet_addr_hash(struct net *net, __be32 addr)
 106 {
 107         u32 val = (__force u32) addr ^ hash_ptr(net, 8);
 108
 109         return ((val ^ (val >> 8) ^ (val >> 16) ^ (val >> 24)) &
 110                 (IN4_ADDR_HSIZE - 1));
 111 }
 112
 113 static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
 114 {
 115         unsigned int hash = inet_addr_hash(net, ifa->ifa_local);
 116
 117         spin_lock(&inet_addr_hash_lock);
 118         hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
 119         spin_unlock(&inet_addr_hash_lock);
 120 }
 121
 122 static void inet_hash_remove(struct in_ifaddr *ifa)
 123 {
 124         spin_lock(&inet_addr_hash_lock);
 125         hlist_del_init_rcu(&ifa->hash);
 126         spin_unlock(&inet_addr_hash_lock);
 127 }
 128
 129 /**
 130  * __ip_dev_find - find the first device with a given source address.
 131  * @net: the net namespace
 132  * @addr: the source address
 133  * @devref: if true, take a reference on the found device
 134  *
 135  * If a caller uses devref=false, it should be protected by RCU, or RTNL
 136  */
 137 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
 138 {
 139         unsigned int hash = inet_addr_hash(net, addr);
 140         struct net_device *result = NULL;
 141         struct in_ifaddr *ifa;
 142         struct hlist_node *node;
 143
 144         rcu_read_lock();
 145         hlist_for_each_entry_rcu(ifa, node, &inet_addr_lst[hash], hash) {
 146                 struct net_device *dev = ifa->ifa_dev->dev;
 147
 148                 if (!net_eq(dev_net(dev), net))
 149                         continue;
 150                 if (ifa->ifa_local == addr) {
 151                         result = dev;
 152                         break;
 153                 }
 154         }
 155         if (!result) {
 156                 struct flowi4 fl4 = { .daddr = addr };
 157                 struct fib_result res = { 0 };
 158                 struct fib_table *local;
 159
 160                 /* Fallback to FIB local table so that communication
 161                  * over loopback subnets work.
 162                  */
 163                 local = fib_get_table(net, RT_TABLE_LOCAL);
 164                 if (local &&
 165                     !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
 166                     res.type == RTN_LOCAL)
 167                         result = FIB_RES_DEV(res);
 168         }
 169         if (result && devref)
 170                 dev_hold(result);
 171         rcu_read_unlock();
 172         return result;
 173 }
 174 EXPORT_SYMBOL(__ip_dev_find);
 175
 176 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
 177
 178 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
 179 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 180                          int destroy);
 181 #ifdef CONFIG_SYSCTL
 182 static void devinet_sysctl_register(struct in_device *idev);
 183 static void devinet_sysctl_unregister(struct in_device *idev);
 184 #else
 185 static inline void devinet_sysctl_register(struct in_device *idev)
 186 {
 187 }
 188 static inline void devinet_sysctl_unregister(struct in_device *idev)
 189 {
 190 }
 191 #endif
 192
 193 /* Locks all the inet devices. */
 194
 195 static struct in_ifaddr *inet_alloc_ifa(void)
 196 {
 197         return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
 198 }
 199
 200 static void inet_rcu_free_ifa(struct rcu_head *head)
 201 {
 202         struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
 203         if (ifa->ifa_dev)
 204                 in_dev_put(ifa->ifa_dev);
 205         kfree(ifa);
 206 }
 207
 208 static inline void inet_free_ifa(struct in_ifaddr *ifa)
 209 {
 210         call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
 211 }
 212
 213 void in_dev_finish_destroy(struct in_device *idev)
 214 {
 215         struct net_device *dev = idev->dev;
 216
 217         WARN_ON(idev->ifa_list);
 218         WARN_ON(idev->mc_list);
 219 #ifdef NET_REFCNT_DEBUG
 220         printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
 221                idev, dev ? dev->name : "NIL");
 222 #endif
 223         dev_put(dev);
 224         if (!idev->dead)
 225                 pr_err("Freeing alive in_device %p\n", idev);
 226         else
 227                 kfree(idev);
 228 }
 229 EXPORT_SYMBOL(in_dev_finish_destroy);
 230
 231 static struct in_device *inetdev_init(struct net_device *dev)
 232 {
 233         struct in_device *in_dev;
 234
 235         ASSERT_RTNL();
 236
 237         in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
 238         if (!in_dev)
 239                 goto out;
 240         memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
 241                         sizeof(in_dev->cnf));
 242         in_dev->cnf.sysctl = NULL;
 243         in_dev->dev = dev;
 244         in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
 245         if (!in_dev->arp_parms)
 246                 goto out_kfree;
 247         if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
 248                 dev_disable_lro(dev);
 249         /* Reference in_dev->dev */
 250         dev_hold(dev);
 251         /* Account for reference dev->ip_ptr (below) */
 252         in_dev_hold(in_dev);
 253
 254         devinet_sysctl_register(in_dev);
 255         ip_mc_init_dev(in_dev);
 256         if (dev->flags & IFF_UP)
 257                 ip_mc_up(in_dev);
 258
 259         /* we can receive as soon as ip_ptr is set -- do this last */
 260         rcu_assign_pointer(dev->ip_ptr, in_dev);
 261 out:
 262         return in_dev;
 263 out_kfree:
 264         kfree(in_dev);
 265         in_dev = NULL;
 266         goto out;
 267 }
 268
 269 static void in_dev_rcu_put(struct rcu_head *head)
 270 {
 271         struct in_device *idev = container_of(head, struct in_device, rcu_head);
 272         in_dev_put(idev);
 273 }
 274
 275 static void inetdev_destroy(struct in_device *in_dev)
 276 {
 277         struct in_ifaddr *ifa;
 278         struct net_device *dev;
 279
 280         ASSERT_RTNL();
 281
 282         dev = in_dev->dev;
 283
 284         in_dev->dead = 1;
 285
 286         ip_mc_destroy_dev(in_dev);
 287
 288         while ((ifa = in_dev->ifa_list) != NULL) {
 289                 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
 290                 inet_free_ifa(ifa);
 291         }
 292
 293         RCU_INIT_POINTER(dev->ip_ptr, NULL);
 294
 295         devinet_sysctl_unregister(in_dev);
 296         neigh_parms_release(&arp_tbl, in_dev->arp_parms);
 297         arp_ifdown(dev);
 298
 299         call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
 300 }
 301
 302 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
 303 {
 304         rcu_read_lock();
 305         for_primary_ifa(in_dev) {
 306                 if (inet_ifa_match(a, ifa)) {
 307                         if (!b || inet_ifa_match(b, ifa)) {
 308                                 rcu_read_unlock();
 309                                 return 1;
 310                         }
 311                 }
 312         } endfor_ifa(in_dev);
 313         rcu_read_unlock();
 314         return 0;
 315 }
 316
 317 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 318                          int destroy, struct nlmsghdr *nlh, u32 pid)
 319 {
 320         struct in_ifaddr *promote = NULL;
 321         struct in_ifaddr *ifa, *ifa1 = *ifap;
 322         struct in_ifaddr *last_prim = in_dev->ifa_list;
 323         struct in_ifaddr *prev_prom = NULL;
 324         int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
 325
 326         ASSERT_RTNL();
 327
 328         /* 1. Deleting primary ifaddr forces deletion all secondaries
 329          * unless alias promotion is set
 330          **/
 331
 332         if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
 333                 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
 334
 335                 while ((ifa = *ifap1) != NULL) {
 336                         if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
 337                             ifa1->ifa_scope <= ifa->ifa_scope)
 338                                 last_prim = ifa;
 339
 340                         if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
 341                             ifa1->ifa_mask != ifa->ifa_mask ||
 342                             !inet_ifa_match(ifa1->ifa_address, ifa)) {
 343                                 ifap1 = &ifa->ifa_next;
 344                                 prev_prom = ifa;
 345                                 continue;
 346                         }
 347
 348                         if (!do_promote) {
 349                                 inet_hash_remove(ifa);
 350                                 *ifap1 = ifa->ifa_next;
 351
 352                                 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
 353                                 blocking_notifier_call_chain(&inetaddr_chain,
 354                                                 NETDEV_DOWN, ifa);
 355                                 inet_free_ifa(ifa);
 356                         } else {
 357                                 promote = ifa;
 358                                 break;
 359                         }
 360                 }
 361         }
 362
 363         /* On promotion all secondaries from subnet are changing
 364          * the primary IP, we must remove all their routes silently
 365          * and later to add them back with new prefsrc. Do this
 366          * while all addresses are on the device list.
 367          */
 368         for (ifa = promote; ifa; ifa = ifa->ifa_next) {
 369                 if (ifa1->ifa_mask == ifa->ifa_mask &&
 370                     inet_ifa_match(ifa1->ifa_address, ifa))
 371                         fib_del_ifaddr(ifa, ifa1);
 372         }
 373
 374         /* 2. Unlink it */
 375
 376         *ifap = ifa1->ifa_next;
 377         inet_hash_remove(ifa1);
 378
 379         /* 3. Announce address deletion */
 380
 381         /* Send message first, then call notifier.
 382            At first sight, FIB update triggered by notifier
 383            will refer to already deleted ifaddr, that could confuse
 384            netlink listeners. It is not true: look, gated sees
 385            that route deleted and if it still thinks that ifaddr
 386            is valid, it will try to restore deleted routes... Grr.
 387            So that, this order is correct.
 388          */
 389         rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
 390         blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
 391
 392         if (promote) {
 393                 struct in_ifaddr *next_sec = promote->ifa_next;
 394
 395                 if (prev_prom) {
 396                         prev_prom->ifa_next = promote->ifa_next;
 397                         promote->ifa_next = last_prim->ifa_next;
 398                         last_prim->ifa_next = promote;
 399                 }
 400
 401                 promote->ifa_flags &= ~IFA_F_SECONDARY;
 402                 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
 403                 blocking_notifier_call_chain(&inetaddr_chain,
 404                                 NETDEV_UP, promote);
 405                 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
 406                         if (ifa1->ifa_mask != ifa->ifa_mask ||
 407                             !inet_ifa_match(ifa1->ifa_address, ifa))
 408                                         continue;
 409                         fib_add_ifaddr(ifa);
 410                 }
 411
 412         }
 413         if (destroy)
 414                 inet_free_ifa(ifa1);
 415 }
 416
 417 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 418                          int destroy)
 419 {
 420         __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
 421 }
 422
 423 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
 424                              u32 pid)
 425 {
 426         struct in_device *in_dev = ifa->ifa_dev;
 427         struct in_ifaddr *ifa1, **ifap, **last_primary;
 428
 429         ASSERT_RTNL();
 430
 431         if (!ifa->ifa_local) {
 432                 inet_free_ifa(ifa);
 433                 return 0;
 434         }
 435
 436         ifa->ifa_flags &= ~IFA_F_SECONDARY;
 437         last_primary = &in_dev->ifa_list;
 438
 439         for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
 440              ifap = &ifa1->ifa_next) {
 441                 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
 442                     ifa->ifa_scope <= ifa1->ifa_scope)
 443                         last_primary = &ifa1->ifa_next;
 444                 if (ifa1->ifa_mask == ifa->ifa_mask &&
 445                     inet_ifa_match(ifa1->ifa_address, ifa)) {
 446                         if (ifa1->ifa_local == ifa->ifa_local) {
 447                                 inet_free_ifa(ifa);
 448                                 return -EEXIST;
 449                         }
 450                         if (ifa1->ifa_scope != ifa->ifa_scope) {
 451                                 inet_free_ifa(ifa);
 452                                 return -EINVAL;
 453                         }
 454                         ifa->ifa_flags |= IFA_F_SECONDARY;
 455                 }
 456         }
 457
 458         if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
 459                 net_srandom(ifa->ifa_local);
 460                 ifap = last_primary;
 461         }
 462
 463         ifa->ifa_next = *ifap;
 464         *ifap = ifa;
 465
 466         inet_hash_insert(dev_net(in_dev->dev), ifa);
 467
 468         /* Send message first, then call notifier.
 469            Notifier will trigger FIB update, so that
 470            listeners of netlink will know about new ifaddr */
 471         rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
 472         blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
 473
 474         return 0;
 475 }
 476
 477 static int inet_insert_ifa(struct in_ifaddr *ifa)
 478 {
 479         return __inet_insert_ifa(ifa, NULL, 0);
 480 }
 481
 482 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
 483 {
 484         struct in_device *in_dev = __in_dev_get_rtnl(dev);
 485
 486         ASSERT_RTNL();
 487
 488         if (!in_dev) {
 489                 inet_free_ifa(ifa);
 490                 return -ENOBUFS;
 491         }
 492         ipv4_devconf_setall(in_dev);
 493         if (ifa->ifa_dev != in_dev) {
 494                 WARN_ON(ifa->ifa_dev);
 495                 in_dev_hold(in_dev);
 496                 ifa->ifa_dev = in_dev;
 497         }
 498         if (ipv4_is_loopback(ifa->ifa_local))
 499                 ifa->ifa_scope = RT_SCOPE_HOST;
 500         return inet_insert_ifa(ifa);
 501 }
 502
 503 /* Caller must hold RCU or RTNL :
 504  * We dont take a reference on found in_device
 505  */
 506 struct in_device *inetdev_by_index(struct net *net, int ifindex)
 507 {
 508         struct net_device *dev;
 509         struct in_device *in_dev = NULL;
 510
 511         rcu_read_lock();
 512         dev = dev_get_by_index_rcu(net, ifindex);
 513         if (dev)
 514                 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
 515         rcu_read_unlock();
 516         return in_dev;
 517 }
 518 EXPORT_SYMBOL(inetdev_by_index);
 519
 520 /* Called only from RTNL semaphored context. No locks. */
 521
 522 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
 523                                     __be32 mask)
 524 {
 525         ASSERT_RTNL();
 526
 527         for_primary_ifa(in_dev) {
 528                 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
 529                         return ifa;
 530         } endfor_ifa(in_dev);
 531         return NULL;
 532 }
 533
 534 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 535 {
 536         struct net *net = sock_net(skb->sk);
 537         struct nlattr *tb[IFA_MAX+1];
 538         struct in_device *in_dev;
 539         struct ifaddrmsg *ifm;
 540         struct in_ifaddr *ifa, **ifap;
 541         int err = -EINVAL;
 542
 543         ASSERT_RTNL();
 544
 545         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
 546         if (err < 0)
 547                 goto errout;
 548
 549         ifm = nlmsg_data(nlh);
 550         in_dev = inetdev_by_index(net, ifm->ifa_index);
 551         if (in_dev == NULL) {
 552                 err = -ENODEV;
 553                 goto errout;
 554         }
 555
 556         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
 557              ifap = &ifa->ifa_next) {
 558                 if (tb[IFA_LOCAL] &&
 559                     ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
 560                         continue;
 561
 562                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 563                         continue;
 564
 565                 if (tb[IFA_ADDRESS] &&
 566                     (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
 567                     !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
 568                         continue;
 569
 570                 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
 571                 return 0;
 572         }
 573
 574         err = -EADDRNOTAVAIL;
 575 errout:
 576         return err;
 577 }
 578
 579 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
 580 {
 581         struct nlattr *tb[IFA_MAX+1];
 582         struct in_ifaddr *ifa;
 583         struct ifaddrmsg *ifm;
 584         struct net_device *dev;
 585         struct in_device *in_dev;
 586         int err;
 587
 588         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
 589         if (err < 0)
 590                 goto errout;
 591
 592         ifm = nlmsg_data(nlh);
 593         err = -EINVAL;
 594         if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
 595                 goto errout;
 596
 597         dev = __dev_get_by_index(net, ifm->ifa_index);
 598         err = -ENODEV;
 599         if (dev == NULL)
 600                 goto errout;
 601
 602         in_dev = __in_dev_get_rtnl(dev);
 603         err = -ENOBUFS;
 604         if (in_dev == NULL)
 605                 goto errout;
 606
 607         ifa = inet_alloc_ifa();
 608         if (ifa == NULL)
 609                 /*
 610                  * A potential indev allocation can be left alive, it stays
 611                  * assigned to its device and is destroy with it.
 612                  */
 613                 goto errout;
 614
 615         ipv4_devconf_setall(in_dev);
 616         in_dev_hold(in_dev);
 617
 618         if (tb[IFA_ADDRESS] == NULL)
 619                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 620
 621         INIT_HLIST_NODE(&ifa->hash);
 622         ifa->ifa_prefixlen = ifm->ifa_prefixlen;
 623         ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
 624         ifa->ifa_flags = ifm->ifa_flags;
 625         ifa->ifa_scope = ifm->ifa_scope;
 626         ifa->ifa_dev = in_dev;
 627
 628         ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
 629         ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
 630
 631         if (tb[IFA_BROADCAST])
 632                 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
 633
 634         if (tb[IFA_LABEL])
 635                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 636         else
 637                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 638
 639         return ifa;
 640
 641 errout:
 642         return ERR_PTR(err);
 643 }
 644
 645 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 646 {
 647         struct net *net = sock_net(skb->sk);
 648         struct in_ifaddr *ifa;
 649
 650         ASSERT_RTNL();
 651
 652         ifa = rtm_to_ifaddr(net, nlh);
 653         if (IS_ERR(ifa))
 654                 return PTR_ERR(ifa);
 655
 656         return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
 657 }
 658
 659 /*
 660  *      Determine a default network mask, based on the IP address.
 661  */
 662
 663 static inline int inet_abc_len(__be32 addr)
 664 {
 665         int rc = -1;    /* Something else, probably a multicast. */
 666
 667         if (ipv4_is_zeronet(addr))
 668                 rc = 0;
 669         else {
 670                 __u32 haddr = ntohl(addr);
 671
 672                 if (IN_CLASSA(haddr))
 673                         rc = 8;
 674                 else if (IN_CLASSB(haddr))
 675                         rc = 16;
 676                 else if (IN_CLASSC(haddr))
 677                         rc = 24;
 678         }
 679
 680         return rc;
 681 }
 682
 683
 684 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 685 {
 686         struct ifreq ifr;
 687         struct sockaddr_in sin_orig;
 688         struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
 689         struct in_device *in_dev;
 690         struct in_ifaddr **ifap = NULL;
 691         struct in_ifaddr *ifa = NULL;
 692         struct net_device *dev;
 693         char *colon;
 694         int ret = -EFAULT;
 695         int tryaddrmatch = 0;
 696
 697         /*
 698          *      Fetch the caller's info block into kernel space
 699          */
 700
 701         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
 702                 goto out;
 703         ifr.ifr_name[IFNAMSIZ - 1] = 0;
 704
 705         /* save original address for comparison */
 706         memcpy(&sin_orig, sin, sizeof(*sin));
 707
 708         colon = strchr(ifr.ifr_name, ':');
 709         if (colon)
 710                 *colon = 0;
 711
 712         dev_load(net, ifr.ifr_name);
 713
 714         switch (cmd) {
 715         case SIOCGIFADDR:       /* Get interface address */
 716         case SIOCGIFBRDADDR:    /* Get the broadcast address */
 717         case SIOCGIFDSTADDR:    /* Get the destination address */
 718         case SIOCGIFNETMASK:    /* Get the netmask for the interface */
 719                 /* Note that these ioctls will not sleep,
 720                    so that we do not impose a lock.
 721                    One day we will be forced to put shlock here (I mean SMP)
 722                  */
 723                 tryaddrmatch = (sin_orig.sin_family == AF_INET);
 724                 memset(sin, 0, sizeof(*sin));
 725                 sin->sin_family = AF_INET;
 726                 break;
 727
 728         case SIOCSIFFLAGS:
 729                 ret = -EACCES;
 730                 if (!capable(CAP_NET_ADMIN))
 731                         goto out;
 732                 break;
 733         case SIOCSIFADDR:       /* Set interface address (and family) */
 734         case SIOCSIFBRDADDR:    /* Set the broadcast address */
 735         case SIOCSIFDSTADDR:    /* Set the destination address */
 736         case SIOCSIFNETMASK:    /* Set the netmask for the interface */
 737                 ret = -EACCES;
 738                 if (!capable(CAP_NET_ADMIN))
 739                         goto out;
 740                 ret = -EINVAL;
 741                 if (sin->sin_family != AF_INET)
 742                         goto out;
 743                 break;
 744         default:
 745                 ret = -EINVAL;
 746                 goto out;
 747         }
 748
 749         rtnl_lock();
 750
 751         ret = -ENODEV;
 752         dev = __dev_get_by_name(net, ifr.ifr_name);
 753         if (!dev)
 754                 goto done;
 755
 756         if (colon)
 757                 *colon = ':';
 758
 759         in_dev = __in_dev_get_rtnl(dev);
 760         if (in_dev) {
 761                 if (tryaddrmatch) {
 762                         /* Matthias Andree */
 763                         /* compare label and address (4.4BSD style) */
 764                         /* note: we only do this for a limited set of ioctls
 765                            and only if the original address family was AF_INET.
 766                            This is checked above. */
 767                         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
 768                              ifap = &ifa->ifa_next) {
 769                                 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
 770                                     sin_orig.sin_addr.s_addr ==
 771                                                         ifa->ifa_local) {
 772                                         break; /* found */
 773                                 }
 774                         }
 775                 }
 776                 /* we didn't get a match, maybe the application is
 777                    4.3BSD-style and passed in junk so we fall back to
 778                    comparing just the label */
 779                 if (!ifa) {
 780                         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
 781                              ifap = &ifa->ifa_next)
 782                                 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
 783                                         break;
 784                 }
 785         }
 786
 787         ret = -EADDRNOTAVAIL;
 788         if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
 789                 goto done;
 790
 791         switch (cmd) {
 792         case SIOCGIFADDR:       /* Get interface address */
 793                 sin->sin_addr.s_addr = ifa->ifa_local;
 794                 goto rarok;
 795
 796         case SIOCGIFBRDADDR:    /* Get the broadcast address */
 797                 sin->sin_addr.s_addr = ifa->ifa_broadcast;
 798                 goto rarok;
 799
 800         case SIOCGIFDSTADDR:    /* Get the destination address */
 801                 sin->sin_addr.s_addr = ifa->ifa_address;
 802                 goto rarok;
 803
 804         case SIOCGIFNETMASK:    /* Get the netmask for the interface */
 805                 sin->sin_addr.s_addr = ifa->ifa_mask;
 806                 goto rarok;
 807
 808         case SIOCSIFFLAGS:
 809                 if (colon) {
 810                         ret = -EADDRNOTAVAIL;
 811                         if (!ifa)
 812                                 break;
 813                         ret = 0;
 814                         if (!(ifr.ifr_flags & IFF_UP))
 815                                 inet_del_ifa(in_dev, ifap, 1);
 816                         break;
 817                 }
 818                 ret = dev_change_flags(dev, ifr.ifr_flags);
 819                 break;
 820
 821         case SIOCSIFADDR:       /* Set interface address (and family) */
 822                 ret = -EINVAL;
 823                 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
 824                         break;
 825
 826                 if (!ifa) {
 827                         ret = -ENOBUFS;
 828                         ifa = inet_alloc_ifa();
 829                         INIT_HLIST_NODE(&ifa->hash);
 830                         if (!ifa)
 831                                 break;
 832                         if (colon)
 833                                 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
 834                         else
 835                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 836                 } else {
 837                         ret = 0;
 838                         if (ifa->ifa_local == sin->sin_addr.s_addr)
 839                                 break;
 840                         inet_del_ifa(in_dev, ifap, 0);
 841                         ifa->ifa_broadcast = 0;
 842                         ifa->ifa_scope = 0;
 843                 }
 844
 845                 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
 846
 847                 if (!(dev->flags & IFF_POINTOPOINT)) {
 848                         ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
 849                         ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
 850                         if ((dev->flags & IFF_BROADCAST) &&
 851                             ifa->ifa_prefixlen < 31)
 852                                 ifa->ifa_broadcast = ifa->ifa_address |
 853                                                      ~ifa->ifa_mask;
 854                 } else {
 855                         ifa->ifa_prefixlen = 32;
 856                         ifa->ifa_mask = inet_make_mask(32);
 857                 }
 858                 ret = inet_set_ifa(dev, ifa);
 859                 break;
 860
 861         case SIOCSIFBRDADDR:    /* Set the broadcast address */
 862                 ret = 0;
 863                 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
 864                         inet_del_ifa(in_dev, ifap, 0);
 865                         ifa->ifa_broadcast = sin->sin_addr.s_addr;
 866                         inet_insert_ifa(ifa);
 867                 }
 868                 break;
 869
 870         case SIOCSIFDSTADDR:    /* Set the destination address */
 871                 ret = 0;
 872                 if (ifa->ifa_address == sin->sin_addr.s_addr)
 873                         break;
 874                 ret = -EINVAL;
 875                 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
 876                         break;
 877                 ret = 0;
 878                 inet_del_ifa(in_dev, ifap, 0);
 879                 ifa->ifa_address = sin->sin_addr.s_addr;
 880                 inet_insert_ifa(ifa);
 881                 break;
 882
 883         case SIOCSIFNETMASK:    /* Set the netmask for the interface */
 884
 885                 /*
 886                  *      The mask we set must be legal.
 887                  */
 888                 ret = -EINVAL;
 889                 if (bad_mask(sin->sin_addr.s_addr, 0))
 890                         break;
 891                 ret = 0;
 892                 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
 893                         __be32 old_mask = ifa->ifa_mask;
 894                         inet_del_ifa(in_dev, ifap, 0);
 895                         ifa->ifa_mask = sin->sin_addr.s_addr;
 896                         ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
 897
 898                         /* See if current broadcast address matches
 899                          * with current netmask, then recalculate
 900                          * the broadcast address. Otherwise it's a
 901                          * funny address, so don't touch it since
 902                          * the user seems to know what (s)he's doing...
 903                          */
 904                         if ((dev->flags & IFF_BROADCAST) &&
 905                             (ifa->ifa_prefixlen < 31) &&
 906                             (ifa->ifa_broadcast ==
 907                              (ifa->ifa_local|~old_mask))) {
 908                                 ifa->ifa_broadcast = (ifa->ifa_local |
 909                                                       ~sin->sin_addr.s_addr);
 910                         }
 911                         inet_insert_ifa(ifa);
 912                 }
 913                 break;
 914         }
 915 done:
 916         rtnl_unlock();
 917 out:
 918         return ret;
 919 rarok:
 920         rtnl_unlock();
 921         ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
 922         goto out;
 923 }
 924
 925 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
 926 {
 927         struct in_device *in_dev = __in_dev_get_rtnl(dev);
 928         struct in_ifaddr *ifa;
 929         struct ifreq ifr;
 930         int done = 0;
 931
 932         if (!in_dev)
 933                 goto out;
 934
 935         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
 936                 if (!buf) {
 937                         done += sizeof(ifr);
 938                         continue;
 939                 }
 940                 if (len < (int) sizeof(ifr))
 941                         break;
 942                 memset(&ifr, 0, sizeof(struct ifreq));
 943                 if (ifa->ifa_label)
 944                         strcpy(ifr.ifr_name, ifa->ifa_label);
 945                 else
 946                         strcpy(ifr.ifr_name, dev->name);
 947
 948                 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
 949                 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
 950                                                                 ifa->ifa_local;
 951
 952                 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
 953                         done = -EFAULT;
 954                         break;
 955                 }
 956                 buf  += sizeof(struct ifreq);
 957                 len  -= sizeof(struct ifreq);
 958                 done += sizeof(struct ifreq);
 959         }
 960 out:
 961         return done;
 962 }
 963
 964 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
 965 {
 966         __be32 addr = 0;
 967         struct in_device *in_dev;
 968         struct net *net = dev_net(dev);
 969
 970         rcu_read_lock();
 971         in_dev = __in_dev_get_rcu(dev);
 972         if (!in_dev)
 973                 goto no_in_dev;
 974
 975         for_primary_ifa(in_dev) {
 976                 if (ifa->ifa_scope > scope)
 977                         continue;
 978                 if (!dst || inet_ifa_match(dst, ifa)) {
 979                         addr = ifa->ifa_local;
 980                         break;
 981                 }
 982                 if (!addr)
 983                         addr = ifa->ifa_local;
 984         } endfor_ifa(in_dev);
 985
 986         if (addr)
 987                 goto out_unlock;
 988 no_in_dev:
 989
 990         /* Not loopback addresses on loopback should be preferred
 991            in this case. It is importnat that lo is the first interface
 992            in dev_base list.
 993          */
 994         for_each_netdev_rcu(net, dev) {
 995                 in_dev = __in_dev_get_rcu(dev);
 996                 if (!in_dev)
 997                         continue;
 998
 999                 for_primary_ifa(in_dev) {
1000                         if (ifa->ifa_scope != RT_SCOPE_LINK &&
1001                             ifa->ifa_scope <= scope) {
1002                                 addr = ifa->ifa_local;
1003                                 goto out_unlock;
1004                         }
1005                 } endfor_ifa(in_dev);
1006         }
1007 out_unlock:
1008         rcu_read_unlock();
1009         return addr;
1010 }
1011 EXPORT_SYMBOL(inet_select_addr);
1012
1013 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1014                               __be32 local, int scope)
1015 {
1016         int same = 0;
1017         __be32 addr = 0;
1018
1019         for_ifa(in_dev) {
1020                 if (!addr &&
1021                     (local == ifa->ifa_local || !local) &&
1022                     ifa->ifa_scope <= scope) {
1023                         addr = ifa->ifa_local;
1024                         if (same)
1025                                 break;
1026                 }
1027                 if (!same) {
1028                         same = (!local || inet_ifa_match(local, ifa)) &&
1029                                 (!dst || inet_ifa_match(dst, ifa));
1030                         if (same && addr) {
1031                                 if (local || !dst)
1032                                         break;
1033                                 /* Is the selected addr into dst subnet? */
1034                                 if (inet_ifa_match(addr, ifa))
1035                                         break;
1036                                 /* No, then can we use new local src? */
1037                                 if (ifa->ifa_scope <= scope) {
1038                                         addr = ifa->ifa_local;
1039                                         break;
1040                                 }
1041                                 /* search for large dst subnet for addr */
1042                                 same = 0;
1043                         }
1044                 }
1045         } endfor_ifa(in_dev);
1046
1047         return same ? addr : 0;
1048 }
1049
1050 /*
1051  * Confirm that local IP address exists using wildcards:
1052  * - in_dev: only on this interface, 0=any interface
1053  * - dst: only in the same subnet as dst, 0=any dst
1054  * - local: address, 0=autoselect the local address
1055  * - scope: maximum allowed scope value for the local address
1056  */
1057 __be32 inet_confirm_addr(struct in_device *in_dev,
1058                          __be32 dst, __be32 local, int scope)
1059 {
1060         __be32 addr = 0;
1061         struct net_device *dev;
1062         struct net *net;
1063
1064         if (scope != RT_SCOPE_LINK)
1065                 return confirm_addr_indev(in_dev, dst, local, scope);
1066
1067         net = dev_net(in_dev->dev);
1068         rcu_read_lock();
1069         for_each_netdev_rcu(net, dev) {
1070                 in_dev = __in_dev_get_rcu(dev);
1071                 if (in_dev) {
1072                         addr = confirm_addr_indev(in_dev, dst, local, scope);
1073                         if (addr)
1074                                 break;
1075                 }
1076         }
1077         rcu_read_unlock();
1078
1079         return addr;
1080 }
1081
1082 /*
1083  *      Device notifier
1084  */
1085
1086 int register_inetaddr_notifier(struct notifier_block *nb)
1087 {
1088         return blocking_notifier_chain_register(&inetaddr_chain, nb);
1089 }
1090 EXPORT_SYMBOL(register_inetaddr_notifier);
1091
1092 int unregister_inetaddr_notifier(struct notifier_block *nb)
1093 {
1094         return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1095 }
1096 EXPORT_SYMBOL(unregister_inetaddr_notifier);
1097
1098 /* Rename ifa_labels for a device name change. Make some effort to preserve
1099  * existing alias numbering and to create unique labels if possible.
1100 */
1101 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1102 {
1103         struct in_ifaddr *ifa;
1104         int named = 0;
1105
1106         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1107                 char old[IFNAMSIZ], *dot;
1108
1109                 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1110                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1111                 if (named++ == 0)
1112                         goto skip;
1113                 dot = strchr(old, ':');
1114                 if (dot == NULL) {
1115                         sprintf(old, ":%d", named);
1116                         dot = old;
1117                 }
1118                 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1119                         strcat(ifa->ifa_label, dot);
1120                 else
1121                         strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1122 skip:
1123                 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1124         }
1125 }
1126
1127 static inline bool inetdev_valid_mtu(unsigned mtu)
1128 {
1129         return mtu >= 68;
1130 }
1131
1132 static void inetdev_send_gratuitous_arp(struct net_device *dev,
1133                                         struct in_device *in_dev)
1134
1135 {
1136         struct in_ifaddr *ifa;
1137
1138         for (ifa = in_dev->ifa_list; ifa;
1139              ifa = ifa->ifa_next) {
1140                 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1141                          ifa->ifa_local, dev,
1142                          ifa->ifa_local, NULL,
1143                          dev->dev_addr, NULL);
1144         }
1145 }
1146
1147 /* Called only under RTNL semaphore */
1148
1149 static int inetdev_event(struct notifier_block *this, unsigned long event,
1150                          void *ptr)
1151 {
1152         struct net_device *dev = ptr;
1153         struct in_device *in_dev = __in_dev_get_rtnl(dev);
1154
1155         ASSERT_RTNL();
1156
1157         if (!in_dev) {
1158                 if (event == NETDEV_REGISTER) {
1159                         in_dev = inetdev_init(dev);
1160                         if (!in_dev)
1161                                 return notifier_from_errno(-ENOMEM);
1162                         if (dev->flags & IFF_LOOPBACK) {
1163                                 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1164                                 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1165                         }
1166                 } else if (event == NETDEV_CHANGEMTU) {
1167                         /* Re-enabling IP */
1168                         if (inetdev_valid_mtu(dev->mtu))
1169                                 in_dev = inetdev_init(dev);
1170                 }
1171                 goto out;
1172         }
1173
1174         switch (event) {
1175         case NETDEV_REGISTER:
1176                 printk(KERN_DEBUG "inetdev_event: bug\n");
1177                 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1178                 break;
1179         case NETDEV_UP:
1180                 if (!inetdev_valid_mtu(dev->mtu))
1181                         break;
1182                 if (dev->flags & IFF_LOOPBACK) {
1183                         struct in_ifaddr *ifa = inet_alloc_ifa();
1184
1185                         if (ifa) {
1186                                 INIT_HLIST_NODE(&ifa->hash);
1187                                 ifa->ifa_local =
1188                                   ifa->ifa_address = htonl(INADDR_LOOPBACK);
1189                                 ifa->ifa_prefixlen = 8;
1190                                 ifa->ifa_mask = inet_make_mask(8);
1191                                 in_dev_hold(in_dev);
1192                                 ifa->ifa_dev = in_dev;
1193                                 ifa->ifa_scope = RT_SCOPE_HOST;
1194                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1195                                 inet_insert_ifa(ifa);
1196                         }
1197                 }
1198                 ip_mc_up(in_dev);
1199                 /* fall through */
1200         case NETDEV_CHANGEADDR:
1201                 if (!IN_DEV_ARP_NOTIFY(in_dev))
1202                         break;
1203                 /* fall through */
1204         case NETDEV_NOTIFY_PEERS:
1205                 /* Send gratuitous ARP to notify of link change */
1206                 inetdev_send_gratuitous_arp(dev, in_dev);
1207                 break;
1208         case NETDEV_DOWN:
1209                 ip_mc_down(in_dev);
1210                 break;
1211         case NETDEV_PRE_TYPE_CHANGE:
1212                 ip_mc_unmap(in_dev);
1213                 break;
1214         case NETDEV_POST_TYPE_CHANGE:
1215                 ip_mc_remap(in_dev);
1216                 break;
1217         case NETDEV_CHANGEMTU:
1218                 if (inetdev_valid_mtu(dev->mtu))
1219                         break;
1220                 /* disable IP when MTU is not enough */
1221         case NETDEV_UNREGISTER:
1222                 inetdev_destroy(in_dev);
1223                 break;
1224         case NETDEV_CHANGENAME:
1225                 /* Do not notify about label change, this event is
1226                  * not interesting to applications using netlink.
1227                  */
1228                 inetdev_changename(dev, in_dev);
1229
1230                 devinet_sysctl_unregister(in_dev);
1231                 devinet_sysctl_register(in_dev);
1232                 break;
1233         }
1234 out:
1235         return NOTIFY_DONE;
1236 }
1237
1238 static struct notifier_block ip_netdev_notifier = {
1239         .notifier_call = inetdev_event,
1240 };
1241
1242 static inline size_t inet_nlmsg_size(void)
1243 {
1244         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1245                + nla_total_size(4) /* IFA_ADDRESS */
1246                + nla_total_size(4) /* IFA_LOCAL */
1247                + nla_total_size(4) /* IFA_BROADCAST */
1248                + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1249 }
1250
1251 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1252                             u32 pid, u32 seq, int event, unsigned int flags)
1253 {
1254         struct ifaddrmsg *ifm;
1255         struct nlmsghdr  *nlh;
1256
1257         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1258         if (nlh == NULL)
1259                 return -EMSGSIZE;
1260
1261         ifm = nlmsg_data(nlh);
1262         ifm->ifa_family = AF_INET;
1263         ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1264         ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1265         ifm->ifa_scope = ifa->ifa_scope;
1266         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1267
1268         if (ifa->ifa_address)
1269                 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1270
1271         if (ifa->ifa_local)
1272                 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1273
1274         if (ifa->ifa_broadcast)
1275                 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1276
1277         if (ifa->ifa_label[0])
1278                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1279
1280         return nlmsg_end(skb, nlh);
1281
1282 nla_put_failure:
1283         nlmsg_cancel(skb, nlh);
1284         return -EMSGSIZE;
1285 }
1286
1287 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1288 {
1289         struct net *net = sock_net(skb->sk);
1290         int h, s_h;
1291         int idx, s_idx;
1292         int ip_idx, s_ip_idx;
1293         struct net_device *dev;
1294         struct in_device *in_dev;
1295         struct in_ifaddr *ifa;
1296         struct hlist_head *head;
1297         struct hlist_node *node;
1298
1299         s_h = cb->args[0];
1300         s_idx = idx = cb->args[1];
1301         s_ip_idx = ip_idx = cb->args[2];
1302
1303         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1304                 idx = 0;
1305                 head = &net->dev_index_head[h];
1306                 rcu_read_lock();
1307                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1308                         if (idx < s_idx)
1309                                 goto cont;
1310                         if (h > s_h || idx > s_idx)
1311                                 s_ip_idx = 0;
1312                         in_dev = __in_dev_get_rcu(dev);
1313                         if (!in_dev)
1314                                 goto cont;
1315
1316                         for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1317                              ifa = ifa->ifa_next, ip_idx++) {
1318                                 if (ip_idx < s_ip_idx)
1319                                         continue;
1320                                 if (inet_fill_ifaddr(skb, ifa,
1321                                              NETLINK_CB(cb->skb).pid,
1322                                              cb->nlh->nlmsg_seq,
1323                                              RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1324                                         rcu_read_unlock();
1325                                         goto done;
1326                                 }
1327                         }
1328 cont:
1329                         idx++;
1330                 }
1331                 rcu_read_unlock();
1332         }
1333
1334 done:
1335         cb->args[0] = h;
1336         cb->args[1] = idx;
1337         cb->args[2] = ip_idx;
1338
1339         return skb->len;
1340 }
1341
1342 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1343                       u32 pid)
1344 {
1345         struct sk_buff *skb;
1346         u32 seq = nlh ? nlh->nlmsg_seq : 0;
1347         int err = -ENOBUFS;
1348         struct net *net;
1349
1350         net = dev_net(ifa->ifa_dev->dev);
1351         skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1352         if (skb == NULL)
1353                 goto errout;
1354
1355         err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1356         if (err < 0) {
1357                 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1358                 WARN_ON(err == -EMSGSIZE);
1359                 kfree_skb(skb);
1360                 goto errout;
1361         }
1362         rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1363         return;
1364 errout:
1365         if (err < 0)
1366                 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1367 }
1368
1369 static size_t inet_get_link_af_size(const struct net_device *dev)
1370 {
1371         struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1372
1373         if (!in_dev)
1374                 return 0;
1375
1376         return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1377 }
1378
1379 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1380 {
1381         struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1382         struct nlattr *nla;
1383         int i;
1384
1385         if (!in_dev)
1386                 return -ENODATA;
1387
1388         nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1389         if (nla == NULL)
1390                 return -EMSGSIZE;
1391
1392         for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1393                 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1394
1395         return 0;
1396 }
1397
1398 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1399         [IFLA_INET_CONF]        = { .type = NLA_NESTED },
1400 };
1401
1402 static int inet_validate_link_af(const struct net_device *dev,
1403                                  const struct nlattr *nla)
1404 {
1405         struct nlattr *a, *tb[IFLA_INET_MAX+1];
1406         int err, rem;
1407
1408         if (dev && !__in_dev_get_rtnl(dev))
1409                 return -EAFNOSUPPORT;
1410
1411         err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1412         if (err < 0)
1413                 return err;
1414
1415         if (tb[IFLA_INET_CONF]) {
1416                 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1417                         int cfgid = nla_type(a);
1418
1419                         if (nla_len(a) < 4)
1420                                 return -EINVAL;
1421
1422                         if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1423                                 return -EINVAL;
1424                 }
1425         }
1426
1427         return 0;
1428 }
1429
1430 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1431 {
1432         struct in_device *in_dev = __in_dev_get_rtnl(dev);
1433         struct nlattr *a, *tb[IFLA_INET_MAX+1];
1434         int rem;
1435
1436         if (!in_dev)
1437                 return -EAFNOSUPPORT;
1438
1439         if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1440                 BUG();
1441
1442         if (tb[IFLA_INET_CONF]) {
1443                 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1444                         ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1445         }
1446
1447         return 0;
1448 }
1449
1450 #ifdef CONFIG_SYSCTL
1451
1452 static void devinet_copy_dflt_conf(struct net *net, int i)
1453 {
1454         struct net_device *dev;
1455
1456         rcu_read_lock();
1457         for_each_netdev_rcu(net, dev) {
1458                 struct in_device *in_dev;
1459
1460                 in_dev = __in_dev_get_rcu(dev);
1461                 if (in_dev && !test_bit(i, in_dev->cnf.state))
1462                         in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1463         }
1464         rcu_read_unlock();
1465 }
1466
1467 /* called with RTNL locked */
1468 static void inet_forward_change(struct net *net)
1469 {
1470         struct net_device *dev;
1471         int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1472
1473         IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1474         IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1475
1476         for_each_netdev(net, dev) {
1477                 struct in_device *in_dev;
1478                 if (on)
1479                         dev_disable_lro(dev);
1480                 rcu_read_lock();
1481                 in_dev = __in_dev_get_rcu(dev);
1482                 if (in_dev)
1483                         IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1484                 rcu_read_unlock();
1485         }
1486 }
1487
1488 static int devinet_conf_proc(ctl_table *ctl, int write,
1489                              void __user *buffer,
1490                              size_t *lenp, loff_t *ppos)
1491 {
1492         int old_value = *(int *)ctl->data;
1493         int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1494         int new_value = *(int *)ctl->data;
1495
1496         if (write) {
1497                 struct ipv4_devconf *cnf = ctl->extra1;
1498                 struct net *net = ctl->extra2;
1499                 int i = (int *)ctl->data - cnf->data;
1500
1501                 set_bit(i, cnf->state);
1502
1503                 if (cnf == net->ipv4.devconf_dflt)
1504                         devinet_copy_dflt_conf(net, i);
1505                 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1)
1506                         if ((new_value == 0) && (old_value != 0))
1507                                 rt_cache_flush(net, 0);
1508         }
1509
1510         return ret;
1511 }
1512
1513 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1514                                   void __user *buffer,
1515                                   size_t *lenp, loff_t *ppos)
1516 {
1517         int *valp = ctl->data;
1518         int val = *valp;
1519         loff_t pos = *ppos;
1520         int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1521
1522         if (write && *valp != val) {
1523                 struct net *net = ctl->extra2;
1524
1525                 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1526                         if (!rtnl_trylock()) {
1527                                 /* Restore the original values before restarting */
1528                                 *valp = val;
1529                                 *ppos = pos;
1530                                 return restart_syscall();
1531                         }
1532                         if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1533                                 inet_forward_change(net);
1534                         } else if (*valp) {
1535                                 struct ipv4_devconf *cnf = ctl->extra1;
1536                                 struct in_device *idev =
1537                                         container_of(cnf, struct in_device, cnf);
1538                                 dev_disable_lro(idev->dev);
1539                         }
1540                         rtnl_unlock();
1541                         rt_cache_flush(net, 0);
1542                 }
1543         }
1544
1545         return ret;
1546 }
1547
1548 static int ipv4_doint_and_flush(ctl_table *ctl, int write,
1549                                 void __user *buffer,
1550                                 size_t *lenp, loff_t *ppos)
1551 {
1552         int *valp = ctl->data;
1553         int val = *valp;
1554         int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1555         struct net *net = ctl->extra2;
1556
1557         if (write && *valp != val)
1558                 rt_cache_flush(net, 0);
1559
1560         return ret;
1561 }
1562
1563 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
1564         { \
1565                 .procname       = name, \
1566                 .data           = ipv4_devconf.data + \
1567                                   IPV4_DEVCONF_ ## attr - 1, \
1568                 .maxlen         = sizeof(int), \
1569                 .mode           = mval, \
1570                 .proc_handler   = proc, \
1571                 .extra1         = &ipv4_devconf, \
1572         }
1573
1574 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1575         DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
1576
1577 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1578         DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
1579
1580 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1581         DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
1582
1583 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1584         DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
1585
1586 static struct devinet_sysctl_table {
1587         struct ctl_table_header *sysctl_header;
1588         struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1589         char *dev_name;
1590 } devinet_sysctl = {
1591         .devinet_vars = {
1592                 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1593                                              devinet_sysctl_forward),
1594                 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1595
1596                 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1597                 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1598                 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1599                 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1600                 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1601                 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1602                                         "accept_source_route"),
1603                 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
1604                 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
1605                 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1606                 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1607                 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1608                 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1609                 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1610                 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1611                 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1612                 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1613                 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1614                 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1615                 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
1616
1617                 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1618                 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1619                 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1620                                               "force_igmp_version"),
1621                 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1622                                               "promote_secondaries"),
1623         },
1624 };
1625
1626 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1627                                         struct ipv4_devconf *p)
1628 {
1629         int i;
1630         struct devinet_sysctl_table *t;
1631
1632 #define DEVINET_CTL_PATH_DEV    3
1633
1634         struct ctl_path devinet_ctl_path[] = {
1635                 { .procname = "net",  },
1636                 { .procname = "ipv4", },
1637                 { .procname = "conf", },
1638                 { /* to be set */ },
1639                 { },
1640         };
1641
1642         t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1643         if (!t)
1644                 goto out;
1645
1646         for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1647                 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1648                 t->devinet_vars[i].extra1 = p;
1649                 t->devinet_vars[i].extra2 = net;
1650         }
1651
1652         /*
1653          * Make a copy of dev_name, because '.procname' is regarded as const
1654          * by sysctl and we wouldn't want anyone to change it under our feet
1655          * (see SIOCSIFNAME).
1656          */
1657         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1658         if (!t->dev_name)
1659                 goto free;
1660
1661         devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1662
1663         t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1664                         t->devinet_vars);
1665         if (!t->sysctl_header)
1666                 goto free_procname;
1667
1668         p->sysctl = t;
1669         return 0;
1670
1671 free_procname:
1672         kfree(t->dev_name);
1673 free:
1674         kfree(t);
1675 out:
1676         return -ENOBUFS;
1677 }
1678
1679 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1680 {
1681         struct devinet_sysctl_table *t = cnf->sysctl;
1682
1683         if (t == NULL)
1684                 return;
1685
1686         cnf->sysctl = NULL;
1687         unregister_net_sysctl_table(t->sysctl_header);
1688         kfree(t->dev_name);
1689         kfree(t);
1690 }
1691
1692 static void devinet_sysctl_register(struct in_device *idev)
1693 {
1694         neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
1695         __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1696                                         &idev->cnf);
1697 }
1698
1699 static void devinet_sysctl_unregister(struct in_device *idev)
1700 {
1701         __devinet_sysctl_unregister(&idev->cnf);
1702         neigh_sysctl_unregister(idev->arp_parms);
1703 }
1704
1705 static struct ctl_table ctl_forward_entry[] = {
1706         {
1707                 .procname       = "ip_forward",
1708                 .data           = &ipv4_devconf.data[
1709                                         IPV4_DEVCONF_FORWARDING - 1],
1710                 .maxlen         = sizeof(int),
1711                 .mode           = 0644,
1712                 .proc_handler   = devinet_sysctl_forward,
1713                 .extra1         = &ipv4_devconf,
1714                 .extra2         = &init_net,
1715         },
1716         { },
1717 };
1718
1719 static __net_initdata struct ctl_path net_ipv4_path[] = {
1720         { .procname = "net", },
1721         { .procname = "ipv4", },
1722         { },
1723 };
1724 #endif
1725
1726 static __net_init int devinet_init_net(struct net *net)
1727 {
1728         int err;
1729         struct ipv4_devconf *all, *dflt;
1730 #ifdef CONFIG_SYSCTL
1731         struct ctl_table *tbl = ctl_forward_entry;
1732         struct ctl_table_header *forw_hdr;
1733 #endif
1734
1735         err = -ENOMEM;
1736         all = &ipv4_devconf;
1737         dflt = &ipv4_devconf_dflt;
1738
1739         if (!net_eq(net, &init_net)) {
1740                 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1741                 if (all == NULL)
1742                         goto err_alloc_all;
1743
1744                 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1745                 if (dflt == NULL)
1746                         goto err_alloc_dflt;
1747
1748 #ifdef CONFIG_SYSCTL
1749                 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1750                 if (tbl == NULL)
1751                         goto err_alloc_ctl;
1752
1753                 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
1754                 tbl[0].extra1 = all;
1755                 tbl[0].extra2 = net;
1756 #endif
1757         }
1758
1759 #ifdef CONFIG_SYSCTL
1760         err = __devinet_sysctl_register(net, "all", all);
1761         if (err < 0)
1762                 goto err_reg_all;
1763
1764         err = __devinet_sysctl_register(net, "default", dflt);
1765         if (err < 0)
1766                 goto err_reg_dflt;
1767
1768         err = -ENOMEM;
1769         forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1770         if (forw_hdr == NULL)
1771                 goto err_reg_ctl;
1772         net->ipv4.forw_hdr = forw_hdr;
1773 #endif
1774
1775         net->ipv4.devconf_all = all;
1776         net->ipv4.devconf_dflt = dflt;
1777         return 0;
1778
1779 #ifdef CONFIG_SYSCTL
1780 err_reg_ctl:
1781         __devinet_sysctl_unregister(dflt);
1782 err_reg_dflt:
1783         __devinet_sysctl_unregister(all);
1784 err_reg_all:
1785         if (tbl != ctl_forward_entry)
1786                 kfree(tbl);
1787 err_alloc_ctl:
1788 #endif
1789         if (dflt != &ipv4_devconf_dflt)
1790                 kfree(dflt);
1791 err_alloc_dflt:
1792         if (all != &ipv4_devconf)
1793                 kfree(all);
1794 err_alloc_all:
1795         return err;
1796 }
1797
1798 static __net_exit void devinet_exit_net(struct net *net)
1799 {
1800 #ifdef CONFIG_SYSCTL
1801         struct ctl_table *tbl;
1802
1803         tbl = net->ipv4.forw_hdr->ctl_table_arg;
1804         unregister_net_sysctl_table(net->ipv4.forw_hdr);
1805         __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1806         __devinet_sysctl_unregister(net->ipv4.devconf_all);
1807         kfree(tbl);
1808 #endif
1809         kfree(net->ipv4.devconf_dflt);
1810         kfree(net->ipv4.devconf_all);
1811 }
1812
1813 static __net_initdata struct pernet_operations devinet_ops = {
1814         .init = devinet_init_net,
1815         .exit = devinet_exit_net,
1816 };
1817
1818 static struct rtnl_af_ops inet_af_ops = {
1819         .family           = AF_INET,
1820         .fill_link_af     = inet_fill_link_af,
1821         .get_link_af_size = inet_get_link_af_size,
1822         .validate_link_af = inet_validate_link_af,
1823         .set_link_af      = inet_set_link_af,
1824 };
1825
1826 void __init devinet_init(void)
1827 {
1828         int i;
1829
1830         for (i = 0; i < IN4_ADDR_HSIZE; i++)
1831                 INIT_HLIST_HEAD(&inet_addr_lst[i]);
1832
1833         register_pernet_subsys(&devinet_ops);
1834
1835         register_gifconf(PF_INET, inet_gifconf);
1836         register_netdevice_notifier(&ip_netdev_notifier);
1837
1838         rtnl_af_register(&inet_af_ops);
1839
1840         rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
1841         rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
1842         rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
1843 }
1844