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   1 /*
   2  *      NET3    IP device support routines.
   3  *
   4  *      Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $
   5  *
   6  *              This program is free software; you can redistribute it and/or
   7  *              modify it under the terms of the GNU General Public License
   8  *              as published by the Free Software Foundation; either version
   9  *              2 of the License, or (at your option) any later version.
  10  *
  11  *      Derived from the IP parts of dev.c 1.0.19
  12  *              Authors:        Ross Biro
  13  *                              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  14  *                              Mark Evans, <evansmp@uhura.aston.ac.uk>
  15  *
  16  *      Additional Authors:
  17  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
  18  *              Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  19  *
  20  *      Changes:
  21  *              Alexey Kuznetsov:       pa_* fields are replaced with ifaddr
  22  *                                      lists.
  23  *              Cyrus Durgin:           updated for kmod
  24  *              Matthias Andree:        in devinet_ioctl, compare label and
  25  *                                      address (4.4BSD alias style support),
  26  *                                      fall back to comparing just the label
  27  *                                      if no match found.
  28  */
  29
  30
  31 #include <asm/uaccess.h>
  32 #include <asm/system.h>
  33 #include <linux/bitops.h>
  34 #include <linux/capability.h>
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/kernel.h>
  38 #include <linux/string.h>
  39 #include <linux/mm.h>
  40 #include <linux/socket.h>
  41 #include <linux/sockios.h>
  42 #include <linux/in.h>
  43 #include <linux/errno.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/if_addr.h>
  46 #include <linux/if_ether.h>
  47 #include <linux/inet.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/etherdevice.h>
  50 #include <linux/skbuff.h>
  51 #include <linux/init.h>
  52 #include <linux/notifier.h>
  53 #include <linux/inetdevice.h>
  54 #include <linux/igmp.h>
  55 #ifdef CONFIG_SYSCTL
  56 #include <linux/sysctl.h>
  57 #endif
  58 #include <linux/kmod.h>
  59
  60 #include <net/arp.h>
  61 #include <net/ip.h>
  62 #include <net/route.h>
  63 #include <net/ip_fib.h>
  64 #include <net/rtnetlink.h>
  65 #include <net/net_namespace.h>
  66
  67 struct ipv4_devconf ipv4_devconf = {
  68         .data = {
  69                 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
  70                 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
  71                 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
  72                 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
  73         },
  74 };
  75
  76 static struct ipv4_devconf ipv4_devconf_dflt = {
  77         .data = {
  78                 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
  79                 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
  80                 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
  81                 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
  82                 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
  83         },
  84 };
  85
  86 #define IPV4_DEVCONF_DFLT(net, attr) \
  87         IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
  88
  89 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
  90         [IFA_LOCAL]             = { .type = NLA_U32 },
  91         [IFA_ADDRESS]           = { .type = NLA_U32 },
  92         [IFA_BROADCAST]         = { .type = NLA_U32 },
  93         [IFA_ANYCAST]           = { .type = NLA_U32 },
  94         [IFA_LABEL]             = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
  95 };
  96
  97 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
  98
  99 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
 100 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 101                          int destroy);
 102 #ifdef CONFIG_SYSCTL
 103 static void devinet_sysctl_register(struct in_device *idev);
 104 static void devinet_sysctl_unregister(struct in_device *idev);
 105 #else
 106 static inline void devinet_sysctl_register(struct in_device *idev)
 107 {
 108 }
 109 static inline void devinet_sysctl_unregister(struct in_device *idev)
 110 {
 111 }
 112 #endif
 113
 114 /* Locks all the inet devices. */
 115
 116 static struct in_ifaddr *inet_alloc_ifa(void)
 117 {
 118         struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
 119
 120         if (ifa) {
 121                 INIT_RCU_HEAD(&ifa->rcu_head);
 122         }
 123
 124         return ifa;
 125 }
 126
 127 static void inet_rcu_free_ifa(struct rcu_head *head)
 128 {
 129         struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
 130         if (ifa->ifa_dev)
 131                 in_dev_put(ifa->ifa_dev);
 132         kfree(ifa);
 133 }
 134
 135 static inline void inet_free_ifa(struct in_ifaddr *ifa)
 136 {
 137         call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
 138 }
 139
 140 void in_dev_finish_destroy(struct in_device *idev)
 141 {
 142         struct net_device *dev = idev->dev;
 143
 144         BUG_TRAP(!idev->ifa_list);
 145         BUG_TRAP(!idev->mc_list);
 146 #ifdef NET_REFCNT_DEBUG
 147         printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
 148                idev, dev ? dev->name : "NIL");
 149 #endif
 150         dev_put(dev);
 151         if (!idev->dead)
 152                 printk("Freeing alive in_device %p\n", idev);
 153         else {
 154                 kfree(idev);
 155         }
 156 }
 157
 158 static struct in_device *inetdev_init(struct net_device *dev)
 159 {
 160         struct in_device *in_dev;
 161
 162         ASSERT_RTNL();
 163
 164         in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
 165         if (!in_dev)
 166                 goto out;
 167         INIT_RCU_HEAD(&in_dev->rcu_head);
 168         memcpy(&in_dev->cnf, dev->nd_net->ipv4.devconf_dflt,
 169                         sizeof(in_dev->cnf));
 170         in_dev->cnf.sysctl = NULL;
 171         in_dev->dev = dev;
 172         if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
 173                 goto out_kfree;
 174         /* Reference in_dev->dev */
 175         dev_hold(dev);
 176         /* Account for reference dev->ip_ptr (below) */
 177         in_dev_hold(in_dev);
 178
 179         devinet_sysctl_register(in_dev);
 180         ip_mc_init_dev(in_dev);
 181         if (dev->flags & IFF_UP)
 182                 ip_mc_up(in_dev);
 183
 184         /* we can receive as soon as ip_ptr is set -- do this last */
 185         rcu_assign_pointer(dev->ip_ptr, in_dev);
 186 out:
 187         return in_dev;
 188 out_kfree:
 189         kfree(in_dev);
 190         in_dev = NULL;
 191         goto out;
 192 }
 193
 194 static void in_dev_rcu_put(struct rcu_head *head)
 195 {
 196         struct in_device *idev = container_of(head, struct in_device, rcu_head);
 197         in_dev_put(idev);
 198 }
 199
 200 static void inetdev_destroy(struct in_device *in_dev)
 201 {
 202         struct in_ifaddr *ifa;
 203         struct net_device *dev;
 204
 205         ASSERT_RTNL();
 206
 207         dev = in_dev->dev;
 208
 209         in_dev->dead = 1;
 210
 211         ip_mc_destroy_dev(in_dev);
 212
 213         while ((ifa = in_dev->ifa_list) != NULL) {
 214                 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
 215                 inet_free_ifa(ifa);
 216         }
 217
 218         dev->ip_ptr = NULL;
 219
 220         devinet_sysctl_unregister(in_dev);
 221         neigh_parms_release(&arp_tbl, in_dev->arp_parms);
 222         arp_ifdown(dev);
 223
 224         call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
 225 }
 226
 227 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
 228 {
 229         rcu_read_lock();
 230         for_primary_ifa(in_dev) {
 231                 if (inet_ifa_match(a, ifa)) {
 232                         if (!b || inet_ifa_match(b, ifa)) {
 233                                 rcu_read_unlock();
 234                                 return 1;
 235                         }
 236                 }
 237         } endfor_ifa(in_dev);
 238         rcu_read_unlock();
 239         return 0;
 240 }
 241
 242 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 243                          int destroy, struct nlmsghdr *nlh, u32 pid)
 244 {
 245         struct in_ifaddr *promote = NULL;
 246         struct in_ifaddr *ifa, *ifa1 = *ifap;
 247         struct in_ifaddr *last_prim = in_dev->ifa_list;
 248         struct in_ifaddr *prev_prom = NULL;
 249         int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
 250
 251         ASSERT_RTNL();
 252
 253         /* 1. Deleting primary ifaddr forces deletion all secondaries
 254          * unless alias promotion is set
 255          **/
 256
 257         if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
 258                 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
 259
 260                 while ((ifa = *ifap1) != NULL) {
 261                         if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
 262                             ifa1->ifa_scope <= ifa->ifa_scope)
 263                                 last_prim = ifa;
 264
 265                         if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
 266                             ifa1->ifa_mask != ifa->ifa_mask ||
 267                             !inet_ifa_match(ifa1->ifa_address, ifa)) {
 268                                 ifap1 = &ifa->ifa_next;
 269                                 prev_prom = ifa;
 270                                 continue;
 271                         }
 272
 273                         if (!do_promote) {
 274                                 *ifap1 = ifa->ifa_next;
 275
 276                                 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
 277                                 blocking_notifier_call_chain(&inetaddr_chain,
 278                                                 NETDEV_DOWN, ifa);
 279                                 inet_free_ifa(ifa);
 280                         } else {
 281                                 promote = ifa;
 282                                 break;
 283                         }
 284                 }
 285         }
 286
 287         /* 2. Unlink it */
 288
 289         *ifap = ifa1->ifa_next;
 290
 291         /* 3. Announce address deletion */
 292
 293         /* Send message first, then call notifier.
 294            At first sight, FIB update triggered by notifier
 295            will refer to already deleted ifaddr, that could confuse
 296            netlink listeners. It is not true: look, gated sees
 297            that route deleted and if it still thinks that ifaddr
 298            is valid, it will try to restore deleted routes... Grr.
 299            So that, this order is correct.
 300          */
 301         rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
 302         blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
 303
 304         if (promote) {
 305
 306                 if (prev_prom) {
 307                         prev_prom->ifa_next = promote->ifa_next;
 308                         promote->ifa_next = last_prim->ifa_next;
 309                         last_prim->ifa_next = promote;
 310                 }
 311
 312                 promote->ifa_flags &= ~IFA_F_SECONDARY;
 313                 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
 314                 blocking_notifier_call_chain(&inetaddr_chain,
 315                                 NETDEV_UP, promote);
 316                 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
 317                         if (ifa1->ifa_mask != ifa->ifa_mask ||
 318                             !inet_ifa_match(ifa1->ifa_address, ifa))
 319                                         continue;
 320                         fib_add_ifaddr(ifa);
 321                 }
 322
 323         }
 324         if (destroy)
 325                 inet_free_ifa(ifa1);
 326 }
 327
 328 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 329                          int destroy)
 330 {
 331         __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
 332 }
 333
 334 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
 335                              u32 pid)
 336 {
 337         struct in_device *in_dev = ifa->ifa_dev;
 338         struct in_ifaddr *ifa1, **ifap, **last_primary;
 339
 340         ASSERT_RTNL();
 341
 342         if (!ifa->ifa_local) {
 343                 inet_free_ifa(ifa);
 344                 return 0;
 345         }
 346
 347         ifa->ifa_flags &= ~IFA_F_SECONDARY;
 348         last_primary = &in_dev->ifa_list;
 349
 350         for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
 351              ifap = &ifa1->ifa_next) {
 352                 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
 353                     ifa->ifa_scope <= ifa1->ifa_scope)
 354                         last_primary = &ifa1->ifa_next;
 355                 if (ifa1->ifa_mask == ifa->ifa_mask &&
 356                     inet_ifa_match(ifa1->ifa_address, ifa)) {
 357                         if (ifa1->ifa_local == ifa->ifa_local) {
 358                                 inet_free_ifa(ifa);
 359                                 return -EEXIST;
 360                         }
 361                         if (ifa1->ifa_scope != ifa->ifa_scope) {
 362                                 inet_free_ifa(ifa);
 363                                 return -EINVAL;
 364                         }
 365                         ifa->ifa_flags |= IFA_F_SECONDARY;
 366                 }
 367         }
 368
 369         if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
 370                 net_srandom(ifa->ifa_local);
 371                 ifap = last_primary;
 372         }
 373
 374         ifa->ifa_next = *ifap;
 375         *ifap = ifa;
 376
 377         /* Send message first, then call notifier.
 378            Notifier will trigger FIB update, so that
 379            listeners of netlink will know about new ifaddr */
 380         rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
 381         blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
 382
 383         return 0;
 384 }
 385
 386 static int inet_insert_ifa(struct in_ifaddr *ifa)
 387 {
 388         return __inet_insert_ifa(ifa, NULL, 0);
 389 }
 390
 391 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
 392 {
 393         struct in_device *in_dev = __in_dev_get_rtnl(dev);
 394
 395         ASSERT_RTNL();
 396
 397         if (!in_dev) {
 398                 inet_free_ifa(ifa);
 399                 return -ENOBUFS;
 400         }
 401         ipv4_devconf_setall(in_dev);
 402         if (ifa->ifa_dev != in_dev) {
 403                 BUG_TRAP(!ifa->ifa_dev);
 404                 in_dev_hold(in_dev);
 405                 ifa->ifa_dev = in_dev;
 406         }
 407         if (ipv4_is_loopback(ifa->ifa_local))
 408                 ifa->ifa_scope = RT_SCOPE_HOST;
 409         return inet_insert_ifa(ifa);
 410 }
 411
 412 struct in_device *inetdev_by_index(int ifindex)
 413 {
 414         struct net_device *dev;
 415         struct in_device *in_dev = NULL;
 416         read_lock(&dev_base_lock);
 417         dev = __dev_get_by_index(&init_net, ifindex);
 418         if (dev)
 419                 in_dev = in_dev_get(dev);
 420         read_unlock(&dev_base_lock);
 421         return in_dev;
 422 }
 423
 424 /* Called only from RTNL semaphored context. No locks. */
 425
 426 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
 427                                     __be32 mask)
 428 {
 429         ASSERT_RTNL();
 430
 431         for_primary_ifa(in_dev) {
 432                 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
 433                         return ifa;
 434         } endfor_ifa(in_dev);
 435         return NULL;
 436 }
 437
 438 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 439 {
 440         struct net *net = skb->sk->sk_net;
 441         struct nlattr *tb[IFA_MAX+1];
 442         struct in_device *in_dev;
 443         struct ifaddrmsg *ifm;
 444         struct in_ifaddr *ifa, **ifap;
 445         int err = -EINVAL;
 446
 447         ASSERT_RTNL();
 448
 449         if (net != &init_net)
 450                 return -EINVAL;
 451
 452         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
 453         if (err < 0)
 454                 goto errout;
 455
 456         ifm = nlmsg_data(nlh);
 457         in_dev = inetdev_by_index(ifm->ifa_index);
 458         if (in_dev == NULL) {
 459                 err = -ENODEV;
 460                 goto errout;
 461         }
 462
 463         __in_dev_put(in_dev);
 464
 465         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
 466              ifap = &ifa->ifa_next) {
 467                 if (tb[IFA_LOCAL] &&
 468                     ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
 469                         continue;
 470
 471                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 472                         continue;
 473
 474                 if (tb[IFA_ADDRESS] &&
 475                     (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
 476                     !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
 477                         continue;
 478
 479                 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
 480                 return 0;
 481         }
 482
 483         err = -EADDRNOTAVAIL;
 484 errout:
 485         return err;
 486 }
 487
 488 static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh)
 489 {
 490         struct nlattr *tb[IFA_MAX+1];
 491         struct in_ifaddr *ifa;
 492         struct ifaddrmsg *ifm;
 493         struct net_device *dev;
 494         struct in_device *in_dev;
 495         int err = -EINVAL;
 496
 497         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
 498         if (err < 0)
 499                 goto errout;
 500
 501         ifm = nlmsg_data(nlh);
 502         if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) {
 503                 err = -EINVAL;
 504                 goto errout;
 505         }
 506
 507         dev = __dev_get_by_index(&init_net, ifm->ifa_index);
 508         if (dev == NULL) {
 509                 err = -ENODEV;
 510                 goto errout;
 511         }
 512
 513         in_dev = __in_dev_get_rtnl(dev);
 514         if (in_dev == NULL) {
 515                 err = -ENOBUFS;
 516                 goto errout;
 517         }
 518
 519         ifa = inet_alloc_ifa();
 520         if (ifa == NULL) {
 521                 /*
 522                  * A potential indev allocation can be left alive, it stays
 523                  * assigned to its device and is destroy with it.
 524                  */
 525                 err = -ENOBUFS;
 526                 goto errout;
 527         }
 528
 529         ipv4_devconf_setall(in_dev);
 530         in_dev_hold(in_dev);
 531
 532         if (tb[IFA_ADDRESS] == NULL)
 533                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 534
 535         ifa->ifa_prefixlen = ifm->ifa_prefixlen;
 536         ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
 537         ifa->ifa_flags = ifm->ifa_flags;
 538         ifa->ifa_scope = ifm->ifa_scope;
 539         ifa->ifa_dev = in_dev;
 540
 541         ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
 542         ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
 543
 544         if (tb[IFA_BROADCAST])
 545                 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
 546
 547         if (tb[IFA_ANYCAST])
 548                 ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]);
 549
 550         if (tb[IFA_LABEL])
 551                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 552         else
 553                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 554
 555         return ifa;
 556
 557 errout:
 558         return ERR_PTR(err);
 559 }
 560
 561 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 562 {
 563         struct net *net = skb->sk->sk_net;
 564         struct in_ifaddr *ifa;
 565
 566         ASSERT_RTNL();
 567
 568         if (net != &init_net)
 569                 return -EINVAL;
 570
 571         ifa = rtm_to_ifaddr(nlh);
 572         if (IS_ERR(ifa))
 573                 return PTR_ERR(ifa);
 574
 575         return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
 576 }
 577
 578 /*
 579  *      Determine a default network mask, based on the IP address.
 580  */
 581
 582 static __inline__ int inet_abc_len(__be32 addr)
 583 {
 584         int rc = -1;    /* Something else, probably a multicast. */
 585
 586         if (ipv4_is_zeronet(addr))
 587                 rc = 0;
 588         else {
 589                 __u32 haddr = ntohl(addr);
 590
 591                 if (IN_CLASSA(haddr))
 592                         rc = 8;
 593                 else if (IN_CLASSB(haddr))
 594                         rc = 16;
 595                 else if (IN_CLASSC(haddr))
 596                         rc = 24;
 597         }
 598
 599         return rc;
 600 }
 601
 602
 603 int devinet_ioctl(unsigned int cmd, void __user *arg)
 604 {
 605         struct ifreq ifr;
 606         struct sockaddr_in sin_orig;
 607         struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
 608         struct in_device *in_dev;
 609         struct in_ifaddr **ifap = NULL;
 610         struct in_ifaddr *ifa = NULL;
 611         struct net_device *dev;
 612         char *colon;
 613         int ret = -EFAULT;
 614         int tryaddrmatch = 0;
 615
 616         /*
 617          *      Fetch the caller's info block into kernel space
 618          */
 619
 620         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
 621                 goto out;
 622         ifr.ifr_name[IFNAMSIZ - 1] = 0;
 623
 624         /* save original address for comparison */
 625         memcpy(&sin_orig, sin, sizeof(*sin));
 626
 627         colon = strchr(ifr.ifr_name, ':');
 628         if (colon)
 629                 *colon = 0;
 630
 631 #ifdef CONFIG_KMOD
 632         dev_load(&init_net, ifr.ifr_name);
 633 #endif
 634
 635         switch (cmd) {
 636         case SIOCGIFADDR:       /* Get interface address */
 637         case SIOCGIFBRDADDR:    /* Get the broadcast address */
 638         case SIOCGIFDSTADDR:    /* Get the destination address */
 639         case SIOCGIFNETMASK:    /* Get the netmask for the interface */
 640                 /* Note that these ioctls will not sleep,
 641                    so that we do not impose a lock.
 642                    One day we will be forced to put shlock here (I mean SMP)
 643                  */
 644                 tryaddrmatch = (sin_orig.sin_family == AF_INET);
 645                 memset(sin, 0, sizeof(*sin));
 646                 sin->sin_family = AF_INET;
 647                 break;
 648
 649         case SIOCSIFFLAGS:
 650                 ret = -EACCES;
 651                 if (!capable(CAP_NET_ADMIN))
 652                         goto out;
 653                 break;
 654         case SIOCSIFADDR:       /* Set interface address (and family) */
 655         case SIOCSIFBRDADDR:    /* Set the broadcast address */
 656         case SIOCSIFDSTADDR:    /* Set the destination address */
 657         case SIOCSIFNETMASK:    /* Set the netmask for the interface */
 658                 ret = -EACCES;
 659                 if (!capable(CAP_NET_ADMIN))
 660                         goto out;
 661                 ret = -EINVAL;
 662                 if (sin->sin_family != AF_INET)
 663                         goto out;
 664                 break;
 665         default:
 666                 ret = -EINVAL;
 667                 goto out;
 668         }
 669
 670         rtnl_lock();
 671
 672         ret = -ENODEV;
 673         if ((dev = __dev_get_by_name(&init_net, ifr.ifr_name)) == NULL)
 674                 goto done;
 675
 676         if (colon)
 677                 *colon = ':';
 678
 679         if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
 680                 if (tryaddrmatch) {
 681                         /* Matthias Andree */
 682                         /* compare label and address (4.4BSD style) */
 683                         /* note: we only do this for a limited set of ioctls
 684                            and only if the original address family was AF_INET.
 685                            This is checked above. */
 686                         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
 687                              ifap = &ifa->ifa_next) {
 688                                 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
 689                                     sin_orig.sin_addr.s_addr ==
 690                                                         ifa->ifa_address) {
 691                                         break; /* found */
 692                                 }
 693                         }
 694                 }
 695                 /* we didn't get a match, maybe the application is
 696                    4.3BSD-style and passed in junk so we fall back to
 697                    comparing just the label */
 698                 if (!ifa) {
 699                         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
 700                              ifap = &ifa->ifa_next)
 701                                 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
 702                                         break;
 703                 }
 704         }
 705
 706         ret = -EADDRNOTAVAIL;
 707         if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
 708                 goto done;
 709
 710         switch (cmd) {
 711         case SIOCGIFADDR:       /* Get interface address */
 712                 sin->sin_addr.s_addr = ifa->ifa_local;
 713                 goto rarok;
 714
 715         case SIOCGIFBRDADDR:    /* Get the broadcast address */
 716                 sin->sin_addr.s_addr = ifa->ifa_broadcast;
 717                 goto rarok;
 718
 719         case SIOCGIFDSTADDR:    /* Get the destination address */
 720                 sin->sin_addr.s_addr = ifa->ifa_address;
 721                 goto rarok;
 722
 723         case SIOCGIFNETMASK:    /* Get the netmask for the interface */
 724                 sin->sin_addr.s_addr = ifa->ifa_mask;
 725                 goto rarok;
 726
 727         case SIOCSIFFLAGS:
 728                 if (colon) {
 729                         ret = -EADDRNOTAVAIL;
 730                         if (!ifa)
 731                                 break;
 732                         ret = 0;
 733                         if (!(ifr.ifr_flags & IFF_UP))
 734                                 inet_del_ifa(in_dev, ifap, 1);
 735                         break;
 736                 }
 737                 ret = dev_change_flags(dev, ifr.ifr_flags);
 738                 break;
 739
 740         case SIOCSIFADDR:       /* Set interface address (and family) */
 741                 ret = -EINVAL;
 742                 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
 743                         break;
 744
 745                 if (!ifa) {
 746                         ret = -ENOBUFS;
 747                         if ((ifa = inet_alloc_ifa()) == NULL)
 748                                 break;
 749                         if (colon)
 750                                 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
 751                         else
 752                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 753                 } else {
 754                         ret = 0;
 755                         if (ifa->ifa_local == sin->sin_addr.s_addr)
 756                                 break;
 757                         inet_del_ifa(in_dev, ifap, 0);
 758                         ifa->ifa_broadcast = 0;
 759                         ifa->ifa_anycast = 0;
 760                 }
 761
 762                 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
 763
 764                 if (!(dev->flags & IFF_POINTOPOINT)) {
 765                         ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
 766                         ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
 767                         if ((dev->flags & IFF_BROADCAST) &&
 768                             ifa->ifa_prefixlen < 31)
 769                                 ifa->ifa_broadcast = ifa->ifa_address |
 770                                                      ~ifa->ifa_mask;
 771                 } else {
 772                         ifa->ifa_prefixlen = 32;
 773                         ifa->ifa_mask = inet_make_mask(32);
 774                 }
 775                 ret = inet_set_ifa(dev, ifa);
 776                 break;
 777
 778         case SIOCSIFBRDADDR:    /* Set the broadcast address */
 779                 ret = 0;
 780                 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
 781                         inet_del_ifa(in_dev, ifap, 0);
 782                         ifa->ifa_broadcast = sin->sin_addr.s_addr;
 783                         inet_insert_ifa(ifa);
 784                 }
 785                 break;
 786
 787         case SIOCSIFDSTADDR:    /* Set the destination address */
 788                 ret = 0;
 789                 if (ifa->ifa_address == sin->sin_addr.s_addr)
 790                         break;
 791                 ret = -EINVAL;
 792                 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
 793                         break;
 794                 ret = 0;
 795                 inet_del_ifa(in_dev, ifap, 0);
 796                 ifa->ifa_address = sin->sin_addr.s_addr;
 797                 inet_insert_ifa(ifa);
 798                 break;
 799
 800         case SIOCSIFNETMASK:    /* Set the netmask for the interface */
 801
 802                 /*
 803                  *      The mask we set must be legal.
 804                  */
 805                 ret = -EINVAL;
 806                 if (bad_mask(sin->sin_addr.s_addr, 0))
 807                         break;
 808                 ret = 0;
 809                 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
 810                         __be32 old_mask = ifa->ifa_mask;
 811                         inet_del_ifa(in_dev, ifap, 0);
 812                         ifa->ifa_mask = sin->sin_addr.s_addr;
 813                         ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
 814
 815                         /* See if current broadcast address matches
 816                          * with current netmask, then recalculate
 817                          * the broadcast address. Otherwise it's a
 818                          * funny address, so don't touch it since
 819                          * the user seems to know what (s)he's doing...
 820                          */
 821                         if ((dev->flags & IFF_BROADCAST) &&
 822                             (ifa->ifa_prefixlen < 31) &&
 823                             (ifa->ifa_broadcast ==
 824                              (ifa->ifa_local|~old_mask))) {
 825                                 ifa->ifa_broadcast = (ifa->ifa_local |
 826                                                       ~sin->sin_addr.s_addr);
 827                         }
 828                         inet_insert_ifa(ifa);
 829                 }
 830                 break;
 831         }
 832 done:
 833         rtnl_unlock();
 834 out:
 835         return ret;
 836 rarok:
 837         rtnl_unlock();
 838         ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
 839         goto out;
 840 }
 841
 842 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
 843 {
 844         struct in_device *in_dev = __in_dev_get_rtnl(dev);
 845         struct in_ifaddr *ifa;
 846         struct ifreq ifr;
 847         int done = 0;
 848
 849         if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
 850                 goto out;
 851
 852         for (; ifa; ifa = ifa->ifa_next) {
 853                 if (!buf) {
 854                         done += sizeof(ifr);
 855                         continue;
 856                 }
 857                 if (len < (int) sizeof(ifr))
 858                         break;
 859                 memset(&ifr, 0, sizeof(struct ifreq));
 860                 if (ifa->ifa_label)
 861                         strcpy(ifr.ifr_name, ifa->ifa_label);
 862                 else
 863                         strcpy(ifr.ifr_name, dev->name);
 864
 865                 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
 866                 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
 867                                                                 ifa->ifa_local;
 868
 869                 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
 870                         done = -EFAULT;
 871                         break;
 872                 }
 873                 buf  += sizeof(struct ifreq);
 874                 len  -= sizeof(struct ifreq);
 875                 done += sizeof(struct ifreq);
 876         }
 877 out:
 878         return done;
 879 }
 880
 881 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
 882 {
 883         __be32 addr = 0;
 884         struct in_device *in_dev;
 885
 886         rcu_read_lock();
 887         in_dev = __in_dev_get_rcu(dev);
 888         if (!in_dev)
 889                 goto no_in_dev;
 890
 891         for_primary_ifa(in_dev) {
 892                 if (ifa->ifa_scope > scope)
 893                         continue;
 894                 if (!dst || inet_ifa_match(dst, ifa)) {
 895                         addr = ifa->ifa_local;
 896                         break;
 897                 }
 898                 if (!addr)
 899                         addr = ifa->ifa_local;
 900         } endfor_ifa(in_dev);
 901 no_in_dev:
 902         rcu_read_unlock();
 903
 904         if (addr)
 905                 goto out;
 906
 907         /* Not loopback addresses on loopback should be preferred
 908            in this case. It is importnat that lo is the first interface
 909            in dev_base list.
 910          */
 911         read_lock(&dev_base_lock);
 912         rcu_read_lock();
 913         for_each_netdev(&init_net, dev) {
 914                 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
 915                         continue;
 916
 917                 for_primary_ifa(in_dev) {
 918                         if (ifa->ifa_scope != RT_SCOPE_LINK &&
 919                             ifa->ifa_scope <= scope) {
 920                                 addr = ifa->ifa_local;
 921                                 goto out_unlock_both;
 922                         }
 923                 } endfor_ifa(in_dev);
 924         }
 925 out_unlock_both:
 926         read_unlock(&dev_base_lock);
 927         rcu_read_unlock();
 928 out:
 929         return addr;
 930 }
 931
 932 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
 933                               __be32 local, int scope)
 934 {
 935         int same = 0;
 936         __be32 addr = 0;
 937
 938         for_ifa(in_dev) {
 939                 if (!addr &&
 940                     (local == ifa->ifa_local || !local) &&
 941                     ifa->ifa_scope <= scope) {
 942                         addr = ifa->ifa_local;
 943                         if (same)
 944                                 break;
 945                 }
 946                 if (!same) {
 947                         same = (!local || inet_ifa_match(local, ifa)) &&
 948                                 (!dst || inet_ifa_match(dst, ifa));
 949                         if (same && addr) {
 950                                 if (local || !dst)
 951                                         break;
 952                                 /* Is the selected addr into dst subnet? */
 953                                 if (inet_ifa_match(addr, ifa))
 954                                         break;
 955                                 /* No, then can we use new local src? */
 956                                 if (ifa->ifa_scope <= scope) {
 957                                         addr = ifa->ifa_local;
 958                                         break;
 959                                 }
 960                                 /* search for large dst subnet for addr */
 961                                 same = 0;
 962                         }
 963                 }
 964         } endfor_ifa(in_dev);
 965
 966         return same? addr : 0;
 967 }
 968
 969 /*
 970  * Confirm that local IP address exists using wildcards:
 971  * - in_dev: only on this interface, 0=any interface
 972  * - dst: only in the same subnet as dst, 0=any dst
 973  * - local: address, 0=autoselect the local address
 974  * - scope: maximum allowed scope value for the local address
 975  */
 976 __be32 inet_confirm_addr(struct in_device *in_dev,
 977                          __be32 dst, __be32 local, int scope)
 978 {
 979         __be32 addr = 0;
 980         struct net_device *dev;
 981
 982         if (in_dev != NULL)
 983                 return confirm_addr_indev(in_dev, dst, local, scope);
 984
 985         read_lock(&dev_base_lock);
 986         rcu_read_lock();
 987         for_each_netdev(&init_net, dev) {
 988                 if ((in_dev = __in_dev_get_rcu(dev))) {
 989                         addr = confirm_addr_indev(in_dev, dst, local, scope);
 990                         if (addr)
 991                                 break;
 992                 }
 993         }
 994         rcu_read_unlock();
 995         read_unlock(&dev_base_lock);
 996
 997         return addr;
 998 }
 999
1000 /*
1001  *      Device notifier
1002  */
1003
1004 int register_inetaddr_notifier(struct notifier_block *nb)
1005 {
1006         return blocking_notifier_chain_register(&inetaddr_chain, nb);
1007 }
1008
1009 int unregister_inetaddr_notifier(struct notifier_block *nb)
1010 {
1011         return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1012 }
1013
1014 /* Rename ifa_labels for a device name change. Make some effort to preserve existing
1015  * alias numbering and to create unique labels if possible.
1016 */
1017 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1018 {
1019         struct in_ifaddr *ifa;
1020         int named = 0;
1021
1022         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1023                 char old[IFNAMSIZ], *dot;
1024
1025                 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1026                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1027                 if (named++ == 0)
1028                         continue;
1029                 dot = strchr(old, ':');
1030                 if (dot == NULL) {
1031                         sprintf(old, ":%d", named);
1032                         dot = old;
1033                 }
1034                 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1035                         strcat(ifa->ifa_label, dot);
1036                 } else {
1037                         strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1038                 }
1039         }
1040 }
1041
1042 /* Called only under RTNL semaphore */
1043
1044 static int inetdev_event(struct notifier_block *this, unsigned long event,
1045                          void *ptr)
1046 {
1047         struct net_device *dev = ptr;
1048         struct in_device *in_dev = __in_dev_get_rtnl(dev);
1049
1050         if (dev->nd_net != &init_net)
1051                 return NOTIFY_DONE;
1052
1053         ASSERT_RTNL();
1054
1055         if (!in_dev) {
1056                 if (event == NETDEV_REGISTER) {
1057                         in_dev = inetdev_init(dev);
1058                         if (!in_dev)
1059                                 return notifier_from_errno(-ENOMEM);
1060                         if (dev->flags & IFF_LOOPBACK) {
1061                                 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1062                                 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1063                         }
1064                 }
1065                 goto out;
1066         }
1067
1068         switch (event) {
1069         case NETDEV_REGISTER:
1070                 printk(KERN_DEBUG "inetdev_event: bug\n");
1071                 dev->ip_ptr = NULL;
1072                 break;
1073         case NETDEV_UP:
1074                 if (dev->mtu < 68)
1075                         break;
1076                 if (dev->flags & IFF_LOOPBACK) {
1077                         struct in_ifaddr *ifa;
1078                         if ((ifa = inet_alloc_ifa()) != NULL) {
1079                                 ifa->ifa_local =
1080                                   ifa->ifa_address = htonl(INADDR_LOOPBACK);
1081                                 ifa->ifa_prefixlen = 8;
1082                                 ifa->ifa_mask = inet_make_mask(8);
1083                                 in_dev_hold(in_dev);
1084                                 ifa->ifa_dev = in_dev;
1085                                 ifa->ifa_scope = RT_SCOPE_HOST;
1086                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1087                                 inet_insert_ifa(ifa);
1088                         }
1089                 }
1090                 ip_mc_up(in_dev);
1091                 break;
1092         case NETDEV_DOWN:
1093                 ip_mc_down(in_dev);
1094                 break;
1095         case NETDEV_CHANGEMTU:
1096                 if (dev->mtu >= 68)
1097                         break;
1098                 /* MTU falled under 68, disable IP */
1099         case NETDEV_UNREGISTER:
1100                 inetdev_destroy(in_dev);
1101                 break;
1102         case NETDEV_CHANGENAME:
1103                 /* Do not notify about label change, this event is
1104                  * not interesting to applications using netlink.
1105                  */
1106                 inetdev_changename(dev, in_dev);
1107
1108                 devinet_sysctl_unregister(in_dev);
1109                 devinet_sysctl_register(in_dev);
1110                 break;
1111         }
1112 out:
1113         return NOTIFY_DONE;
1114 }
1115
1116 static struct notifier_block ip_netdev_notifier = {
1117         .notifier_call =inetdev_event,
1118 };
1119
1120 static inline size_t inet_nlmsg_size(void)
1121 {
1122         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1123                + nla_total_size(4) /* IFA_ADDRESS */
1124                + nla_total_size(4) /* IFA_LOCAL */
1125                + nla_total_size(4) /* IFA_BROADCAST */
1126                + nla_total_size(4) /* IFA_ANYCAST */
1127                + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1128 }
1129
1130 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1131                             u32 pid, u32 seq, int event, unsigned int flags)
1132 {
1133         struct ifaddrmsg *ifm;
1134         struct nlmsghdr  *nlh;
1135
1136         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1137         if (nlh == NULL)
1138                 return -EMSGSIZE;
1139
1140         ifm = nlmsg_data(nlh);
1141         ifm->ifa_family = AF_INET;
1142         ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1143         ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1144         ifm->ifa_scope = ifa->ifa_scope;
1145         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1146
1147         if (ifa->ifa_address)
1148                 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1149
1150         if (ifa->ifa_local)
1151                 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1152
1153         if (ifa->ifa_broadcast)
1154                 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1155
1156         if (ifa->ifa_anycast)
1157                 NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast);
1158
1159         if (ifa->ifa_label[0])
1160                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1161
1162         return nlmsg_end(skb, nlh);
1163
1164 nla_put_failure:
1165         nlmsg_cancel(skb, nlh);
1166         return -EMSGSIZE;
1167 }
1168
1169 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1170 {
1171         struct net *net = skb->sk->sk_net;
1172         int idx, ip_idx;
1173         struct net_device *dev;
1174         struct in_device *in_dev;
1175         struct in_ifaddr *ifa;
1176         int s_ip_idx, s_idx = cb->args[0];
1177
1178         if (net != &init_net)
1179                 return 0;
1180
1181         s_ip_idx = ip_idx = cb->args[1];
1182         idx = 0;
1183         for_each_netdev(&init_net, dev) {
1184                 if (idx < s_idx)
1185                         goto cont;
1186                 if (idx > s_idx)
1187                         s_ip_idx = 0;
1188                 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
1189                         goto cont;
1190
1191                 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1192                      ifa = ifa->ifa_next, ip_idx++) {
1193                         if (ip_idx < s_ip_idx)
1194                                 continue;
1195                         if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1196                                              cb->nlh->nlmsg_seq,
1197                                              RTM_NEWADDR, NLM_F_MULTI) <= 0)
1198                                 goto done;
1199                 }
1200 cont:
1201                 idx++;
1202         }
1203
1204 done:
1205         cb->args[0] = idx;
1206         cb->args[1] = ip_idx;
1207
1208         return skb->len;
1209 }
1210
1211 static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
1212                       u32 pid)
1213 {
1214         struct sk_buff *skb;
1215         u32 seq = nlh ? nlh->nlmsg_seq : 0;
1216         int err = -ENOBUFS;
1217
1218         skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1219         if (skb == NULL)
1220                 goto errout;
1221
1222         err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1223         if (err < 0) {
1224                 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1225                 WARN_ON(err == -EMSGSIZE);
1226                 kfree_skb(skb);
1227                 goto errout;
1228         }
1229         err = rtnl_notify(skb, &init_net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1230 errout:
1231         if (err < 0)
1232                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV4_IFADDR, err);
1233 }
1234
1235 #ifdef CONFIG_SYSCTL
1236
1237 static void devinet_copy_dflt_conf(struct net *net, int i)
1238 {
1239         struct net_device *dev;
1240
1241         read_lock(&dev_base_lock);
1242         for_each_netdev(net, dev) {
1243                 struct in_device *in_dev;
1244                 rcu_read_lock();
1245                 in_dev = __in_dev_get_rcu(dev);
1246                 if (in_dev && !test_bit(i, in_dev->cnf.state))
1247                         in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1248                 rcu_read_unlock();
1249         }
1250         read_unlock(&dev_base_lock);
1251 }
1252
1253 static void inet_forward_change(struct net *net)
1254 {
1255         struct net_device *dev;
1256         int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1257
1258         IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1259         IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1260
1261         read_lock(&dev_base_lock);
1262         for_each_netdev(net, dev) {
1263                 struct in_device *in_dev;
1264                 rcu_read_lock();
1265                 in_dev = __in_dev_get_rcu(dev);
1266                 if (in_dev)
1267                         IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1268                 rcu_read_unlock();
1269         }
1270         read_unlock(&dev_base_lock);
1271
1272         rt_cache_flush(0);
1273 }
1274
1275 static int devinet_conf_proc(ctl_table *ctl, int write,
1276                              struct file* filp, void __user *buffer,
1277                              size_t *lenp, loff_t *ppos)
1278 {
1279         int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1280
1281         if (write) {
1282                 struct ipv4_devconf *cnf = ctl->extra1;
1283                 struct net *net = ctl->extra2;
1284                 int i = (int *)ctl->data - cnf->data;
1285
1286                 set_bit(i, cnf->state);
1287
1288                 if (cnf == net->ipv4.devconf_dflt)
1289                         devinet_copy_dflt_conf(net, i);
1290         }
1291
1292         return ret;
1293 }
1294
1295 static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen,
1296                                void __user *oldval, size_t __user *oldlenp,
1297                                void __user *newval, size_t newlen)
1298 {
1299         struct ipv4_devconf *cnf;
1300         struct net *net;
1301         int *valp = table->data;
1302         int new;
1303         int i;
1304
1305         if (!newval || !newlen)
1306                 return 0;
1307
1308         if (newlen != sizeof(int))
1309                 return -EINVAL;
1310
1311         if (get_user(new, (int __user *)newval))
1312                 return -EFAULT;
1313
1314         if (new == *valp)
1315                 return 0;
1316
1317         if (oldval && oldlenp) {
1318                 size_t len;
1319
1320                 if (get_user(len, oldlenp))
1321                         return -EFAULT;
1322
1323                 if (len) {
1324                         if (len > table->maxlen)
1325                                 len = table->maxlen;
1326                         if (copy_to_user(oldval, valp, len))
1327                                 return -EFAULT;
1328                         if (put_user(len, oldlenp))
1329                                 return -EFAULT;
1330                 }
1331         }
1332
1333         *valp = new;
1334
1335         cnf = table->extra1;
1336         net = table->extra2;
1337         i = (int *)table->data - cnf->data;
1338
1339         set_bit(i, cnf->state);
1340
1341         if (cnf == net->ipv4.devconf_dflt)
1342                 devinet_copy_dflt_conf(net, i);
1343
1344         return 1;
1345 }
1346
1347 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1348                                   struct file* filp, void __user *buffer,
1349                                   size_t *lenp, loff_t *ppos)
1350 {
1351         int *valp = ctl->data;
1352         int val = *valp;
1353         int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1354
1355         if (write && *valp != val) {
1356                 struct net *net = ctl->extra2;
1357
1358                 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING))
1359                         inet_forward_change(net);
1360                 else if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING))
1361                         rt_cache_flush(0);
1362         }
1363
1364         return ret;
1365 }
1366
1367 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1368                          struct file* filp, void __user *buffer,
1369                          size_t *lenp, loff_t *ppos)
1370 {
1371         int *valp = ctl->data;
1372         int val = *valp;
1373         int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1374
1375         if (write && *valp != val)
1376                 rt_cache_flush(0);
1377
1378         return ret;
1379 }
1380
1381 int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
1382                                   void __user *oldval, size_t __user *oldlenp,
1383                                   void __user *newval, size_t newlen)
1384 {
1385         int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp,
1386                                       newval, newlen);
1387
1388         if (ret == 1)
1389                 rt_cache_flush(0);
1390
1391         return ret;
1392 }
1393
1394
1395 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \
1396         { \
1397                 .ctl_name       = NET_IPV4_CONF_ ## attr, \
1398                 .procname       = name, \
1399                 .data           = ipv4_devconf.data + \
1400                                   NET_IPV4_CONF_ ## attr - 1, \
1401                 .maxlen         = sizeof(int), \
1402                 .mode           = mval, \
1403                 .proc_handler   = proc, \
1404                 .strategy       = sysctl, \
1405                 .extra1         = &ipv4_devconf, \
1406         }
1407
1408 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1409         DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \
1410                              devinet_conf_sysctl)
1411
1412 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1413         DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \
1414                              devinet_conf_sysctl)
1415
1416 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \
1417         DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl)
1418
1419 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1420         DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \
1421                                      ipv4_doint_and_flush_strategy)
1422
1423 static struct devinet_sysctl_table {
1424         struct ctl_table_header *sysctl_header;
1425         struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
1426         char *dev_name;
1427 } devinet_sysctl = {
1428         .devinet_vars = {
1429                 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1430                                              devinet_sysctl_forward,
1431                                              devinet_conf_sysctl),
1432                 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1433
1434                 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1435                 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1436                 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1437                 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1438                 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1439                 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1440                                         "accept_source_route"),
1441                 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1442                 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1443                 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1444                 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1445                 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1446                 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1447                 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1448                 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1449                 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1450
1451                 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1452                 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1453                 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1454                                               "force_igmp_version"),
1455                 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1456                                               "promote_secondaries"),
1457         },
1458 };
1459
1460 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1461                 int ctl_name, struct ipv4_devconf *p)
1462 {
1463         int i;
1464         struct devinet_sysctl_table *t;
1465
1466 #define DEVINET_CTL_PATH_DEV    3
1467
1468         struct ctl_path devinet_ctl_path[] = {
1469                 { .procname = "net", .ctl_name = CTL_NET, },
1470                 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1471                 { .procname = "conf", .ctl_name = NET_IPV4_CONF, },
1472                 { /* to be set */ },
1473                 { },
1474         };
1475
1476         t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1477         if (!t)
1478                 goto out;
1479
1480         for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1481                 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1482                 t->devinet_vars[i].extra1 = p;
1483                 t->devinet_vars[i].extra2 = net;
1484         }
1485
1486         /*
1487          * Make a copy of dev_name, because '.procname' is regarded as const
1488          * by sysctl and we wouldn't want anyone to change it under our feet
1489          * (see SIOCSIFNAME).
1490          */
1491         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1492         if (!t->dev_name)
1493                 goto free;
1494
1495         devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1496         devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name;
1497
1498         t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1499                         t->devinet_vars);
1500         if (!t->sysctl_header)
1501                 goto free_procname;
1502
1503         p->sysctl = t;
1504         return 0;
1505
1506 free_procname:
1507         kfree(t->dev_name);
1508 free:
1509         kfree(t);
1510 out:
1511         return -ENOBUFS;
1512 }
1513
1514 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1515 {
1516         struct devinet_sysctl_table *t = cnf->sysctl;
1517
1518         if (t == NULL)
1519                 return;
1520
1521         cnf->sysctl = NULL;
1522         unregister_sysctl_table(t->sysctl_header);
1523         kfree(t->dev_name);
1524         kfree(t);
1525 }
1526
1527 static void devinet_sysctl_register(struct in_device *idev)
1528 {
1529         neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4,
1530                         NET_IPV4_NEIGH, "ipv4", NULL, NULL);
1531         __devinet_sysctl_register(idev->dev->nd_net, idev->dev->name,
1532                         idev->dev->ifindex, &idev->cnf);
1533 }
1534
1535 static void devinet_sysctl_unregister(struct in_device *idev)
1536 {
1537         __devinet_sysctl_unregister(&idev->cnf);
1538         neigh_sysctl_unregister(idev->arp_parms);
1539 }
1540
1541 static struct ctl_table ctl_forward_entry[] = {
1542         {
1543                 .ctl_name       = NET_IPV4_FORWARD,
1544                 .procname       = "ip_forward",
1545                 .data           = &ipv4_devconf.data[
1546                                         NET_IPV4_CONF_FORWARDING - 1],
1547                 .maxlen         = sizeof(int),
1548                 .mode           = 0644,
1549                 .proc_handler   = devinet_sysctl_forward,
1550                 .strategy       = devinet_conf_sysctl,
1551                 .extra1         = &ipv4_devconf,
1552                 .extra2         = &init_net,
1553         },
1554         { },
1555 };
1556
1557 static __net_initdata struct ctl_path net_ipv4_path[] = {
1558         { .procname = "net", .ctl_name = CTL_NET, },
1559         { .procname = "ipv4", .ctl_name = NET_IPV4, },
1560         { },
1561 };
1562 #endif
1563
1564 static __net_init int devinet_init_net(struct net *net)
1565 {
1566         int err;
1567         struct ipv4_devconf *all, *dflt;
1568 #ifdef CONFIG_SYSCTL
1569         struct ctl_table *tbl = ctl_forward_entry;
1570         struct ctl_table_header *forw_hdr;
1571 #endif
1572
1573         err = -ENOMEM;
1574         all = &ipv4_devconf;
1575         dflt = &ipv4_devconf_dflt;
1576
1577         if (net != &init_net) {
1578                 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1579                 if (all == NULL)
1580                         goto err_alloc_all;
1581
1582                 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1583                 if (dflt == NULL)
1584                         goto err_alloc_dflt;
1585
1586 #ifdef CONFIG_SYSCTL
1587                 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1588                 if (tbl == NULL)
1589                         goto err_alloc_ctl;
1590
1591                 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1];
1592                 tbl[0].extra1 = all;
1593                 tbl[0].extra2 = net;
1594 #endif
1595         }
1596
1597 #ifdef CONFIG_SYSCTL
1598         err = __devinet_sysctl_register(net, "all",
1599                         NET_PROTO_CONF_ALL, all);
1600         if (err < 0)
1601                 goto err_reg_all;
1602
1603         err = __devinet_sysctl_register(net, "default",
1604                         NET_PROTO_CONF_DEFAULT, dflt);
1605         if (err < 0)
1606                 goto err_reg_dflt;
1607
1608         err = -ENOMEM;
1609         forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1610         if (forw_hdr == NULL)
1611                 goto err_reg_ctl;
1612         net->ipv4.forw_hdr = forw_hdr;
1613 #endif
1614
1615         net->ipv4.devconf_all = all;
1616         net->ipv4.devconf_dflt = dflt;
1617         return 0;
1618
1619 #ifdef CONFIG_SYSCTL
1620 err_reg_ctl:
1621         __devinet_sysctl_unregister(dflt);
1622 err_reg_dflt:
1623         __devinet_sysctl_unregister(all);
1624 err_reg_all:
1625         if (tbl != ctl_forward_entry)
1626                 kfree(tbl);
1627 err_alloc_ctl:
1628 #endif
1629         if (dflt != &ipv4_devconf_dflt)
1630                 kfree(dflt);
1631 err_alloc_dflt:
1632         if (all != &ipv4_devconf)
1633                 kfree(all);
1634 err_alloc_all:
1635         return err;
1636 }
1637
1638 static __net_exit void devinet_exit_net(struct net *net)
1639 {
1640 #ifdef CONFIG_SYSCTL
1641         struct ctl_table *tbl;
1642
1643         tbl = net->ipv4.forw_hdr->ctl_table_arg;
1644         unregister_net_sysctl_table(net->ipv4.forw_hdr);
1645         __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1646         __devinet_sysctl_unregister(net->ipv4.devconf_all);
1647         kfree(tbl);
1648 #endif
1649         kfree(net->ipv4.devconf_dflt);
1650         kfree(net->ipv4.devconf_all);
1651 }
1652
1653 static __net_initdata struct pernet_operations devinet_ops = {
1654         .init = devinet_init_net,
1655         .exit = devinet_exit_net,
1656 };
1657
1658 void __init devinet_init(void)
1659 {
1660         register_pernet_subsys(&devinet_ops);
1661
1662         register_gifconf(PF_INET, inet_gifconf);
1663         register_netdevice_notifier(&ip_netdev_notifier);
1664
1665         rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1666         rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1667         rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1668 }
1669
1670 EXPORT_SYMBOL(in_dev_finish_destroy);
1671 EXPORT_SYMBOL(inet_select_addr);
1672 EXPORT_SYMBOL(inetdev_by_index);
1673 EXPORT_SYMBOL(register_inetaddr_notifier);
1674 EXPORT_SYMBOL(unregister_inetaddr_notifier);