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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/sched.h>
  39 #include <linux/string.h>
  40 #include <linux/mm.h>
  41 #include <linux/socket.h>
  42 #include <linux/sockios.h>
  43 #include <linux/in.h>
  44 #include <linux/errno.h>
  45 #include <linux/interrupt.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/rtnetlink.h>
  52 #include <linux/init.h>
  53 #include <linux/notifier.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/igmp.h>
  56 #ifdef CONFIG_SYSCTL
  57 #include <linux/sysctl.h>
  58 #endif
  59 #include <linux/kmod.h>
  60
  61 #include <net/arp.h>
  62 #include <net/ip.h>
  63 #include <net/route.h>
  64 #include <net/ip_fib.h>
  65 #include <net/netlink.h>
  66
  67 struct ipv4_devconf ipv4_devconf = {
  68         .accept_redirects = 1,
  69         .send_redirects =  1,
  70         .secure_redirects = 1,
  71         .shared_media =   1,
  72 };
  73
  74 static struct ipv4_devconf ipv4_devconf_dflt = {
  75         .accept_redirects =  1,
  76         .send_redirects =    1,
  77         .secure_redirects =  1,
  78         .shared_media =      1,
  79         .accept_source_route = 1,
  80 };
  81
  82 static struct nla_policy ifa_ipv4_policy[IFA_MAX+1] __read_mostly = {
  83         [IFA_LOCAL]             = { .type = NLA_U32 },
  84         [IFA_ADDRESS]           = { .type = NLA_U32 },
  85         [IFA_BROADCAST]         = { .type = NLA_U32 },
  86         [IFA_ANYCAST]           = { .type = NLA_U32 },
  87         [IFA_LABEL]             = { .type = NLA_STRING },
  88 };
  89
  90 static void rtmsg_ifa(int event, struct in_ifaddr *);
  91
  92 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
  93 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
  94                          int destroy);
  95 #ifdef CONFIG_SYSCTL
  96 static void devinet_sysctl_register(struct in_device *in_dev,
  97                                     struct ipv4_devconf *p);
  98 static void devinet_sysctl_unregister(struct ipv4_devconf *p);
  99 #endif
 100
 101 /* Locks all the inet devices. */
 102
 103 static struct in_ifaddr *inet_alloc_ifa(void)
 104 {
 105         struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
 106
 107         if (ifa) {
 108                 INIT_RCU_HEAD(&ifa->rcu_head);
 109         }
 110
 111         return ifa;
 112 }
 113
 114 static void inet_rcu_free_ifa(struct rcu_head *head)
 115 {
 116         struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
 117         if (ifa->ifa_dev)
 118                 in_dev_put(ifa->ifa_dev);
 119         kfree(ifa);
 120 }
 121
 122 static inline void inet_free_ifa(struct in_ifaddr *ifa)
 123 {
 124         call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
 125 }
 126
 127 void in_dev_finish_destroy(struct in_device *idev)
 128 {
 129         struct net_device *dev = idev->dev;
 130
 131         BUG_TRAP(!idev->ifa_list);
 132         BUG_TRAP(!idev->mc_list);
 133 #ifdef NET_REFCNT_DEBUG
 134         printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
 135                idev, dev ? dev->name : "NIL");
 136 #endif
 137         dev_put(dev);
 138         if (!idev->dead)
 139                 printk("Freeing alive in_device %p\n", idev);
 140         else {
 141                 kfree(idev);
 142         }
 143 }
 144
 145 struct in_device *inetdev_init(struct net_device *dev)
 146 {
 147         struct in_device *in_dev;
 148
 149         ASSERT_RTNL();
 150
 151         in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
 152         if (!in_dev)
 153                 goto out;
 154         INIT_RCU_HEAD(&in_dev->rcu_head);
 155         memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf));
 156         in_dev->cnf.sysctl = NULL;
 157         in_dev->dev = dev;
 158         if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
 159                 goto out_kfree;
 160         /* Reference in_dev->dev */
 161         dev_hold(dev);
 162 #ifdef CONFIG_SYSCTL
 163         neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
 164                               NET_IPV4_NEIGH, "ipv4", NULL, NULL);
 165 #endif
 166
 167         /* Account for reference dev->ip_ptr */
 168         in_dev_hold(in_dev);
 169         rcu_assign_pointer(dev->ip_ptr, in_dev);
 170
 171 #ifdef CONFIG_SYSCTL
 172         devinet_sysctl_register(in_dev, &in_dev->cnf);
 173 #endif
 174         ip_mc_init_dev(in_dev);
 175         if (dev->flags & IFF_UP)
 176                 ip_mc_up(in_dev);
 177 out:
 178         return in_dev;
 179 out_kfree:
 180         kfree(in_dev);
 181         in_dev = NULL;
 182         goto out;
 183 }
 184
 185 static void in_dev_rcu_put(struct rcu_head *head)
 186 {
 187         struct in_device *idev = container_of(head, struct in_device, rcu_head);
 188         in_dev_put(idev);
 189 }
 190
 191 static void inetdev_destroy(struct in_device *in_dev)
 192 {
 193         struct in_ifaddr *ifa;
 194         struct net_device *dev;
 195
 196         ASSERT_RTNL();
 197
 198         dev = in_dev->dev;
 199         if (dev == &loopback_dev)
 200                 return;
 201
 202         in_dev->dead = 1;
 203
 204         ip_mc_destroy_dev(in_dev);
 205
 206         while ((ifa = in_dev->ifa_list) != NULL) {
 207                 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
 208                 inet_free_ifa(ifa);
 209         }
 210
 211 #ifdef CONFIG_SYSCTL
 212         devinet_sysctl_unregister(&in_dev->cnf);
 213 #endif
 214
 215         dev->ip_ptr = NULL;
 216
 217 #ifdef CONFIG_SYSCTL
 218         neigh_sysctl_unregister(in_dev->arp_parms);
 219 #endif
 220         neigh_parms_release(&arp_tbl, in_dev->arp_parms);
 221         arp_ifdown(dev);
 222
 223         call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
 224 }
 225
 226 int inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b)
 227 {
 228         rcu_read_lock();
 229         for_primary_ifa(in_dev) {
 230                 if (inet_ifa_match(a, ifa)) {
 231                         if (!b || inet_ifa_match(b, ifa)) {
 232                                 rcu_read_unlock();
 233                                 return 1;
 234                         }
 235                 }
 236         } endfor_ifa(in_dev);
 237         rcu_read_unlock();
 238         return 0;
 239 }
 240
 241 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 242                          int destroy)
 243 {
 244         struct in_ifaddr *promote = NULL;
 245         struct in_ifaddr *ifa, *ifa1 = *ifap;
 246         struct in_ifaddr *last_prim = in_dev->ifa_list;
 247         struct in_ifaddr *prev_prom = NULL;
 248         int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
 249
 250         ASSERT_RTNL();
 251
 252         /* 1. Deleting primary ifaddr forces deletion all secondaries
 253          * unless alias promotion is set
 254          **/
 255
 256         if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
 257                 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
 258
 259                 while ((ifa = *ifap1) != NULL) {
 260                         if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
 261                             ifa1->ifa_scope <= ifa->ifa_scope)
 262                                 last_prim = ifa;
 263
 264                         if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
 265                             ifa1->ifa_mask != ifa->ifa_mask ||
 266                             !inet_ifa_match(ifa1->ifa_address, ifa)) {
 267                                 ifap1 = &ifa->ifa_next;
 268                                 prev_prom = ifa;
 269                                 continue;
 270                         }
 271
 272                         if (!do_promote) {
 273                                 *ifap1 = ifa->ifa_next;
 274
 275                                 rtmsg_ifa(RTM_DELADDR, ifa);
 276                                 blocking_notifier_call_chain(&inetaddr_chain,
 277                                                 NETDEV_DOWN, ifa);
 278                                 inet_free_ifa(ifa);
 279                         } else {
 280                                 promote = ifa;
 281                                 break;
 282                         }
 283                 }
 284         }
 285
 286         /* 2. Unlink it */
 287
 288         *ifap = ifa1->ifa_next;
 289
 290         /* 3. Announce address deletion */
 291
 292         /* Send message first, then call notifier.
 293            At first sight, FIB update triggered by notifier
 294            will refer to already deleted ifaddr, that could confuse
 295            netlink listeners. It is not true: look, gated sees
 296            that route deleted and if it still thinks that ifaddr
 297            is valid, it will try to restore deleted routes... Grr.
 298            So that, this order is correct.
 299          */
 300         rtmsg_ifa(RTM_DELADDR, ifa1);
 301         blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
 302
 303         if (promote) {
 304
 305                 if (prev_prom) {
 306                         prev_prom->ifa_next = promote->ifa_next;
 307                         promote->ifa_next = last_prim->ifa_next;
 308                         last_prim->ifa_next = promote;
 309                 }
 310
 311                 promote->ifa_flags &= ~IFA_F_SECONDARY;
 312                 rtmsg_ifa(RTM_NEWADDR, promote);
 313                 blocking_notifier_call_chain(&inetaddr_chain,
 314                                 NETDEV_UP, promote);
 315                 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
 316                         if (ifa1->ifa_mask != ifa->ifa_mask ||
 317                             !inet_ifa_match(ifa1->ifa_address, ifa))
 318                                         continue;
 319                         fib_add_ifaddr(ifa);
 320                 }
 321
 322         }
 323         if (destroy) {
 324                 inet_free_ifa(ifa1);
 325
 326                 if (!in_dev->ifa_list)
 327                         inetdev_destroy(in_dev);
 328         }
 329 }
 330
 331 static int inet_insert_ifa(struct in_ifaddr *ifa)
 332 {
 333         struct in_device *in_dev = ifa->ifa_dev;
 334         struct in_ifaddr *ifa1, **ifap, **last_primary;
 335
 336         ASSERT_RTNL();
 337
 338         if (!ifa->ifa_local) {
 339                 inet_free_ifa(ifa);
 340                 return 0;
 341         }
 342
 343         ifa->ifa_flags &= ~IFA_F_SECONDARY;
 344         last_primary = &in_dev->ifa_list;
 345
 346         for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
 347              ifap = &ifa1->ifa_next) {
 348                 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
 349                     ifa->ifa_scope <= ifa1->ifa_scope)
 350                         last_primary = &ifa1->ifa_next;
 351                 if (ifa1->ifa_mask == ifa->ifa_mask &&
 352                     inet_ifa_match(ifa1->ifa_address, ifa)) {
 353                         if (ifa1->ifa_local == ifa->ifa_local) {
 354                                 inet_free_ifa(ifa);
 355                                 return -EEXIST;
 356                         }
 357                         if (ifa1->ifa_scope != ifa->ifa_scope) {
 358                                 inet_free_ifa(ifa);
 359                                 return -EINVAL;
 360                         }
 361                         ifa->ifa_flags |= IFA_F_SECONDARY;
 362                 }
 363         }
 364
 365         if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
 366                 net_srandom(ifa->ifa_local);
 367                 ifap = last_primary;
 368         }
 369
 370         ifa->ifa_next = *ifap;
 371         *ifap = ifa;
 372
 373         /* Send message first, then call notifier.
 374            Notifier will trigger FIB update, so that
 375            listeners of netlink will know about new ifaddr */
 376         rtmsg_ifa(RTM_NEWADDR, ifa);
 377         blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
 378
 379         return 0;
 380 }
 381
 382 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
 383 {
 384         struct in_device *in_dev = __in_dev_get_rtnl(dev);
 385
 386         ASSERT_RTNL();
 387
 388         if (!in_dev) {
 389                 in_dev = inetdev_init(dev);
 390                 if (!in_dev) {
 391                         inet_free_ifa(ifa);
 392                         return -ENOBUFS;
 393                 }
 394         }
 395         if (ifa->ifa_dev != in_dev) {
 396                 BUG_TRAP(!ifa->ifa_dev);
 397                 in_dev_hold(in_dev);
 398                 ifa->ifa_dev = in_dev;
 399         }
 400         if (LOOPBACK(ifa->ifa_local))
 401                 ifa->ifa_scope = RT_SCOPE_HOST;
 402         return inet_insert_ifa(ifa);
 403 }
 404
 405 struct in_device *inetdev_by_index(int ifindex)
 406 {
 407         struct net_device *dev;
 408         struct in_device *in_dev = NULL;
 409         read_lock(&dev_base_lock);
 410         dev = __dev_get_by_index(ifindex);
 411         if (dev)
 412                 in_dev = in_dev_get(dev);
 413         read_unlock(&dev_base_lock);
 414         return in_dev;
 415 }
 416
 417 /* Called only from RTNL semaphored context. No locks. */
 418
 419 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix,
 420                                     u32 mask)
 421 {
 422         ASSERT_RTNL();
 423
 424         for_primary_ifa(in_dev) {
 425                 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
 426                         return ifa;
 427         } endfor_ifa(in_dev);
 428         return NULL;
 429 }
 430
 431 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 432 {
 433         struct nlattr *tb[IFA_MAX+1];
 434         struct in_device *in_dev;
 435         struct ifaddrmsg *ifm;
 436         struct in_ifaddr *ifa, **ifap;
 437         int err = -EINVAL;
 438
 439         ASSERT_RTNL();
 440
 441         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
 442         if (err < 0)
 443                 goto errout;
 444
 445         ifm = nlmsg_data(nlh);
 446         in_dev = inetdev_by_index(ifm->ifa_index);
 447         if (in_dev == NULL) {
 448                 err = -ENODEV;
 449                 goto errout;
 450         }
 451
 452         __in_dev_put(in_dev);
 453
 454         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
 455              ifap = &ifa->ifa_next) {
 456                 if (tb[IFA_LOCAL] &&
 457                     ifa->ifa_local != nla_get_u32(tb[IFA_LOCAL]))
 458                         continue;
 459
 460                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 461                         continue;
 462
 463                 if (tb[IFA_ADDRESS] &&
 464                     (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
 465                     !inet_ifa_match(nla_get_u32(tb[IFA_ADDRESS]), ifa)))
 466                         continue;
 467
 468                 inet_del_ifa(in_dev, ifap, 1);
 469                 return 0;
 470         }
 471
 472         err = -EADDRNOTAVAIL;
 473 errout:
 474         return err;
 475 }
 476
 477 static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh)
 478 {
 479         struct nlattr *tb[IFA_MAX+1];
 480         struct in_ifaddr *ifa;
 481         struct ifaddrmsg *ifm;
 482         struct net_device *dev;
 483         struct in_device *in_dev;
 484         int err = -EINVAL;
 485
 486         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
 487         if (err < 0)
 488                 goto errout;
 489
 490         ifm = nlmsg_data(nlh);
 491         if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
 492                 goto errout;
 493
 494         dev = __dev_get_by_index(ifm->ifa_index);
 495         if (dev == NULL) {
 496                 err = -ENODEV;
 497                 goto errout;
 498         }
 499
 500         in_dev = __in_dev_get_rtnl(dev);
 501         if (in_dev == NULL) {
 502                 in_dev = inetdev_init(dev);
 503                 if (in_dev == NULL) {
 504                         err = -ENOBUFS;
 505                         goto errout;
 506                 }
 507         }
 508
 509         ifa = inet_alloc_ifa();
 510         if (ifa == NULL) {
 511                 /*
 512                  * A potential indev allocation can be left alive, it stays
 513                  * assigned to its device and is destroy with it.
 514                  */
 515                 err = -ENOBUFS;
 516                 goto errout;
 517         }
 518
 519         in_dev_hold(in_dev);
 520
 521         if (tb[IFA_ADDRESS] == NULL)
 522                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 523
 524         ifa->ifa_prefixlen = ifm->ifa_prefixlen;
 525         ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
 526         ifa->ifa_flags = ifm->ifa_flags;
 527         ifa->ifa_scope = ifm->ifa_scope;
 528         ifa->ifa_dev = in_dev;
 529
 530         ifa->ifa_local = nla_get_u32(tb[IFA_LOCAL]);
 531         ifa->ifa_address = nla_get_u32(tb[IFA_ADDRESS]);
 532
 533         if (tb[IFA_BROADCAST])
 534                 ifa->ifa_broadcast = nla_get_u32(tb[IFA_BROADCAST]);
 535
 536         if (tb[IFA_ANYCAST])
 537                 ifa->ifa_anycast = nla_get_u32(tb[IFA_ANYCAST]);
 538
 539         if (tb[IFA_LABEL])
 540                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 541         else
 542                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 543
 544         return ifa;
 545
 546 errout:
 547         return ERR_PTR(err);
 548 }
 549
 550 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 551 {
 552         struct in_ifaddr *ifa;
 553
 554         ASSERT_RTNL();
 555
 556         ifa = rtm_to_ifaddr(nlh);
 557         if (IS_ERR(ifa))
 558                 return PTR_ERR(ifa);
 559
 560         return inet_insert_ifa(ifa);
 561 }
 562
 563 /*
 564  *      Determine a default network mask, based on the IP address.
 565  */
 566
 567 static __inline__ int inet_abc_len(u32 addr)
 568 {
 569         int rc = -1;    /* Something else, probably a multicast. */
 570
 571         if (ZERONET(addr))
 572                 rc = 0;
 573         else {
 574                 addr = ntohl(addr);
 575
 576                 if (IN_CLASSA(addr))
 577                         rc = 8;
 578                 else if (IN_CLASSB(addr))
 579                         rc = 16;
 580                 else if (IN_CLASSC(addr))
 581                         rc = 24;
 582         }
 583
 584         return rc;
 585 }
 586
 587
 588 int devinet_ioctl(unsigned int cmd, void __user *arg)
 589 {
 590         struct ifreq ifr;
 591         struct sockaddr_in sin_orig;
 592         struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
 593         struct in_device *in_dev;
 594         struct in_ifaddr **ifap = NULL;
 595         struct in_ifaddr *ifa = NULL;
 596         struct net_device *dev;
 597         char *colon;
 598         int ret = -EFAULT;
 599         int tryaddrmatch = 0;
 600
 601         /*
 602          *      Fetch the caller's info block into kernel space
 603          */
 604
 605         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
 606                 goto out;
 607         ifr.ifr_name[IFNAMSIZ - 1] = 0;
 608
 609         /* save original address for comparison */
 610         memcpy(&sin_orig, sin, sizeof(*sin));
 611
 612         colon = strchr(ifr.ifr_name, ':');
 613         if (colon)
 614                 *colon = 0;
 615
 616 #ifdef CONFIG_KMOD
 617         dev_load(ifr.ifr_name);
 618 #endif
 619
 620         switch(cmd) {
 621         case SIOCGIFADDR:       /* Get interface address */
 622         case SIOCGIFBRDADDR:    /* Get the broadcast address */
 623         case SIOCGIFDSTADDR:    /* Get the destination address */
 624         case SIOCGIFNETMASK:    /* Get the netmask for the interface */
 625                 /* Note that these ioctls will not sleep,
 626                    so that we do not impose a lock.
 627                    One day we will be forced to put shlock here (I mean SMP)
 628                  */
 629                 tryaddrmatch = (sin_orig.sin_family == AF_INET);
 630                 memset(sin, 0, sizeof(*sin));
 631                 sin->sin_family = AF_INET;
 632                 break;
 633
 634         case SIOCSIFFLAGS:
 635                 ret = -EACCES;
 636                 if (!capable(CAP_NET_ADMIN))
 637                         goto out;
 638                 break;
 639         case SIOCSIFADDR:       /* Set interface address (and family) */
 640         case SIOCSIFBRDADDR:    /* Set the broadcast address */
 641         case SIOCSIFDSTADDR:    /* Set the destination address */
 642         case SIOCSIFNETMASK:    /* Set the netmask for the interface */
 643                 ret = -EACCES;
 644                 if (!capable(CAP_NET_ADMIN))
 645                         goto out;
 646                 ret = -EINVAL;
 647                 if (sin->sin_family != AF_INET)
 648                         goto out;
 649                 break;
 650         default:
 651                 ret = -EINVAL;
 652                 goto out;
 653         }
 654
 655         rtnl_lock();
 656
 657         ret = -ENODEV;
 658         if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL)
 659                 goto done;
 660
 661         if (colon)
 662                 *colon = ':';
 663
 664         if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
 665                 if (tryaddrmatch) {
 666                         /* Matthias Andree */
 667                         /* compare label and address (4.4BSD style) */
 668                         /* note: we only do this for a limited set of ioctls
 669                            and only if the original address family was AF_INET.
 670                            This is checked above. */
 671                         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
 672                              ifap = &ifa->ifa_next) {
 673                                 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
 674                                     sin_orig.sin_addr.s_addr ==
 675                                                         ifa->ifa_address) {
 676                                         break; /* found */
 677                                 }
 678                         }
 679                 }
 680                 /* we didn't get a match, maybe the application is
 681                    4.3BSD-style and passed in junk so we fall back to
 682                    comparing just the label */
 683                 if (!ifa) {
 684                         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
 685                              ifap = &ifa->ifa_next)
 686                                 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
 687                                         break;
 688                 }
 689         }
 690
 691         ret = -EADDRNOTAVAIL;
 692         if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
 693                 goto done;
 694
 695         switch(cmd) {
 696         case SIOCGIFADDR:       /* Get interface address */
 697                 sin->sin_addr.s_addr = ifa->ifa_local;
 698                 goto rarok;
 699
 700         case SIOCGIFBRDADDR:    /* Get the broadcast address */
 701                 sin->sin_addr.s_addr = ifa->ifa_broadcast;
 702                 goto rarok;
 703
 704         case SIOCGIFDSTADDR:    /* Get the destination address */
 705                 sin->sin_addr.s_addr = ifa->ifa_address;
 706                 goto rarok;
 707
 708         case SIOCGIFNETMASK:    /* Get the netmask for the interface */
 709                 sin->sin_addr.s_addr = ifa->ifa_mask;
 710                 goto rarok;
 711
 712         case SIOCSIFFLAGS:
 713                 if (colon) {
 714                         ret = -EADDRNOTAVAIL;
 715                         if (!ifa)
 716                                 break;
 717                         ret = 0;
 718                         if (!(ifr.ifr_flags & IFF_UP))
 719                                 inet_del_ifa(in_dev, ifap, 1);
 720                         break;
 721                 }
 722                 ret = dev_change_flags(dev, ifr.ifr_flags);
 723                 break;
 724
 725         case SIOCSIFADDR:       /* Set interface address (and family) */
 726                 ret = -EINVAL;
 727                 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
 728                         break;
 729
 730                 if (!ifa) {
 731                         ret = -ENOBUFS;
 732                         if ((ifa = inet_alloc_ifa()) == NULL)
 733                                 break;
 734                         if (colon)
 735                                 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
 736                         else
 737                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 738                 } else {
 739                         ret = 0;
 740                         if (ifa->ifa_local == sin->sin_addr.s_addr)
 741                                 break;
 742                         inet_del_ifa(in_dev, ifap, 0);
 743                         ifa->ifa_broadcast = 0;
 744                         ifa->ifa_anycast = 0;
 745                 }
 746
 747                 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
 748
 749                 if (!(dev->flags & IFF_POINTOPOINT)) {
 750                         ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
 751                         ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
 752                         if ((dev->flags & IFF_BROADCAST) &&
 753                             ifa->ifa_prefixlen < 31)
 754                                 ifa->ifa_broadcast = ifa->ifa_address |
 755                                                      ~ifa->ifa_mask;
 756                 } else {
 757                         ifa->ifa_prefixlen = 32;
 758                         ifa->ifa_mask = inet_make_mask(32);
 759                 }
 760                 ret = inet_set_ifa(dev, ifa);
 761                 break;
 762
 763         case SIOCSIFBRDADDR:    /* Set the broadcast address */
 764                 ret = 0;
 765                 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
 766                         inet_del_ifa(in_dev, ifap, 0);
 767                         ifa->ifa_broadcast = sin->sin_addr.s_addr;
 768                         inet_insert_ifa(ifa);
 769                 }
 770                 break;
 771
 772         case SIOCSIFDSTADDR:    /* Set the destination address */
 773                 ret = 0;
 774                 if (ifa->ifa_address == sin->sin_addr.s_addr)
 775                         break;
 776                 ret = -EINVAL;
 777                 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
 778                         break;
 779                 ret = 0;
 780                 inet_del_ifa(in_dev, ifap, 0);
 781                 ifa->ifa_address = sin->sin_addr.s_addr;
 782                 inet_insert_ifa(ifa);
 783                 break;
 784
 785         case SIOCSIFNETMASK:    /* Set the netmask for the interface */
 786
 787                 /*
 788                  *      The mask we set must be legal.
 789                  */
 790                 ret = -EINVAL;
 791                 if (bad_mask(sin->sin_addr.s_addr, 0))
 792                         break;
 793                 ret = 0;
 794                 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
 795                         u32 old_mask = ifa->ifa_mask;
 796                         inet_del_ifa(in_dev, ifap, 0);
 797                         ifa->ifa_mask = sin->sin_addr.s_addr;
 798                         ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
 799
 800                         /* See if current broadcast address matches
 801                          * with current netmask, then recalculate
 802                          * the broadcast address. Otherwise it's a
 803                          * funny address, so don't touch it since
 804                          * the user seems to know what (s)he's doing...
 805                          */
 806                         if ((dev->flags & IFF_BROADCAST) &&
 807                             (ifa->ifa_prefixlen < 31) &&
 808                             (ifa->ifa_broadcast ==
 809                              (ifa->ifa_local|~old_mask))) {
 810                                 ifa->ifa_broadcast = (ifa->ifa_local |
 811                                                       ~sin->sin_addr.s_addr);
 812                         }
 813                         inet_insert_ifa(ifa);
 814                 }
 815                 break;
 816         }
 817 done:
 818         rtnl_unlock();
 819 out:
 820         return ret;
 821 rarok:
 822         rtnl_unlock();
 823         ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
 824         goto out;
 825 }
 826
 827 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
 828 {
 829         struct in_device *in_dev = __in_dev_get_rtnl(dev);
 830         struct in_ifaddr *ifa;
 831         struct ifreq ifr;
 832         int done = 0;
 833
 834         if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
 835                 goto out;
 836
 837         for (; ifa; ifa = ifa->ifa_next) {
 838                 if (!buf) {
 839                         done += sizeof(ifr);
 840                         continue;
 841                 }
 842                 if (len < (int) sizeof(ifr))
 843                         break;
 844                 memset(&ifr, 0, sizeof(struct ifreq));
 845                 if (ifa->ifa_label)
 846                         strcpy(ifr.ifr_name, ifa->ifa_label);
 847                 else
 848                         strcpy(ifr.ifr_name, dev->name);
 849
 850                 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
 851                 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
 852                                                                 ifa->ifa_local;
 853
 854                 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
 855                         done = -EFAULT;
 856                         break;
 857                 }
 858                 buf  += sizeof(struct ifreq);
 859                 len  -= sizeof(struct ifreq);
 860                 done += sizeof(struct ifreq);
 861         }
 862 out:
 863         return done;
 864 }
 865
 866 u32 inet_select_addr(const struct net_device *dev, u32 dst, int scope)
 867 {
 868         u32 addr = 0;
 869         struct in_device *in_dev;
 870
 871         rcu_read_lock();
 872         in_dev = __in_dev_get_rcu(dev);
 873         if (!in_dev)
 874                 goto no_in_dev;
 875
 876         for_primary_ifa(in_dev) {
 877                 if (ifa->ifa_scope > scope)
 878                         continue;
 879                 if (!dst || inet_ifa_match(dst, ifa)) {
 880                         addr = ifa->ifa_local;
 881                         break;
 882                 }
 883                 if (!addr)
 884                         addr = ifa->ifa_local;
 885         } endfor_ifa(in_dev);
 886 no_in_dev:
 887         rcu_read_unlock();
 888
 889         if (addr)
 890                 goto out;
 891
 892         /* Not loopback addresses on loopback should be preferred
 893            in this case. It is importnat that lo is the first interface
 894            in dev_base list.
 895          */
 896         read_lock(&dev_base_lock);
 897         rcu_read_lock();
 898         for (dev = dev_base; dev; dev = dev->next) {
 899                 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
 900                         continue;
 901
 902                 for_primary_ifa(in_dev) {
 903                         if (ifa->ifa_scope != RT_SCOPE_LINK &&
 904                             ifa->ifa_scope <= scope) {
 905                                 addr = ifa->ifa_local;
 906                                 goto out_unlock_both;
 907                         }
 908                 } endfor_ifa(in_dev);
 909         }
 910 out_unlock_both:
 911         read_unlock(&dev_base_lock);
 912         rcu_read_unlock();
 913 out:
 914         return addr;
 915 }
 916
 917 static u32 confirm_addr_indev(struct in_device *in_dev, u32 dst,
 918                               u32 local, int scope)
 919 {
 920         int same = 0;
 921         u32 addr = 0;
 922
 923         for_ifa(in_dev) {
 924                 if (!addr &&
 925                     (local == ifa->ifa_local || !local) &&
 926                     ifa->ifa_scope <= scope) {
 927                         addr = ifa->ifa_local;
 928                         if (same)
 929                                 break;
 930                 }
 931                 if (!same) {
 932                         same = (!local || inet_ifa_match(local, ifa)) &&
 933                                 (!dst || inet_ifa_match(dst, ifa));
 934                         if (same && addr) {
 935                                 if (local || !dst)
 936                                         break;
 937                                 /* Is the selected addr into dst subnet? */
 938                                 if (inet_ifa_match(addr, ifa))
 939                                         break;
 940                                 /* No, then can we use new local src? */
 941                                 if (ifa->ifa_scope <= scope) {
 942                                         addr = ifa->ifa_local;
 943                                         break;
 944                                 }
 945                                 /* search for large dst subnet for addr */
 946                                 same = 0;
 947                         }
 948                 }
 949         } endfor_ifa(in_dev);
 950
 951         return same? addr : 0;
 952 }
 953
 954 /*
 955  * Confirm that local IP address exists using wildcards:
 956  * - dev: only on this interface, 0=any interface
 957  * - dst: only in the same subnet as dst, 0=any dst
 958  * - local: address, 0=autoselect the local address
 959  * - scope: maximum allowed scope value for the local address
 960  */
 961 u32 inet_confirm_addr(const struct net_device *dev, u32 dst, u32 local, int scope)
 962 {
 963         u32 addr = 0;
 964         struct in_device *in_dev;
 965
 966         if (dev) {
 967                 rcu_read_lock();
 968                 if ((in_dev = __in_dev_get_rcu(dev)))
 969                         addr = confirm_addr_indev(in_dev, dst, local, scope);
 970                 rcu_read_unlock();
 971
 972                 return addr;
 973         }
 974
 975         read_lock(&dev_base_lock);
 976         rcu_read_lock();
 977         for (dev = dev_base; dev; dev = dev->next) {
 978                 if ((in_dev = __in_dev_get_rcu(dev))) {
 979                         addr = confirm_addr_indev(in_dev, dst, local, scope);
 980                         if (addr)
 981                                 break;
 982                 }
 983         }
 984         rcu_read_unlock();
 985         read_unlock(&dev_base_lock);
 986
 987         return addr;
 988 }
 989
 990 /*
 991  *      Device notifier
 992  */
 993
 994 int register_inetaddr_notifier(struct notifier_block *nb)
 995 {
 996         return blocking_notifier_chain_register(&inetaddr_chain, nb);
 997 }
 998
 999 int unregister_inetaddr_notifier(struct notifier_block *nb)
1000 {
1001         return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1002 }
1003
1004 /* Rename ifa_labels for a device name change. Make some effort to preserve existing
1005  * alias numbering and to create unique labels if possible.
1006 */
1007 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1008 {
1009         struct in_ifaddr *ifa;
1010         int named = 0;
1011
1012         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1013                 char old[IFNAMSIZ], *dot;
1014
1015                 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1016                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1017                 if (named++ == 0)
1018                         continue;
1019                 dot = strchr(ifa->ifa_label, ':');
1020                 if (dot == NULL) {
1021                         sprintf(old, ":%d", named);
1022                         dot = old;
1023                 }
1024                 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1025                         strcat(ifa->ifa_label, dot);
1026                 } else {
1027                         strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1028                 }
1029         }
1030 }
1031
1032 /* Called only under RTNL semaphore */
1033
1034 static int inetdev_event(struct notifier_block *this, unsigned long event,
1035                          void *ptr)
1036 {
1037         struct net_device *dev = ptr;
1038         struct in_device *in_dev = __in_dev_get_rtnl(dev);
1039
1040         ASSERT_RTNL();
1041
1042         if (!in_dev) {
1043                 if (event == NETDEV_REGISTER && dev == &loopback_dev) {
1044                         in_dev = inetdev_init(dev);
1045                         if (!in_dev)
1046                                 panic("devinet: Failed to create loopback\n");
1047                         in_dev->cnf.no_xfrm = 1;
1048                         in_dev->cnf.no_policy = 1;
1049                 }
1050                 goto out;
1051         }
1052
1053         switch (event) {
1054         case NETDEV_REGISTER:
1055                 printk(KERN_DEBUG "inetdev_event: bug\n");
1056                 dev->ip_ptr = NULL;
1057                 break;
1058         case NETDEV_UP:
1059                 if (dev->mtu < 68)
1060                         break;
1061                 if (dev == &loopback_dev) {
1062                         struct in_ifaddr *ifa;
1063                         if ((ifa = inet_alloc_ifa()) != NULL) {
1064                                 ifa->ifa_local =
1065                                   ifa->ifa_address = htonl(INADDR_LOOPBACK);
1066                                 ifa->ifa_prefixlen = 8;
1067                                 ifa->ifa_mask = inet_make_mask(8);
1068                                 in_dev_hold(in_dev);
1069                                 ifa->ifa_dev = in_dev;
1070                                 ifa->ifa_scope = RT_SCOPE_HOST;
1071                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1072                                 inet_insert_ifa(ifa);
1073                         }
1074                 }
1075                 ip_mc_up(in_dev);
1076                 break;
1077         case NETDEV_DOWN:
1078                 ip_mc_down(in_dev);
1079                 break;
1080         case NETDEV_CHANGEMTU:
1081                 if (dev->mtu >= 68)
1082                         break;
1083                 /* MTU falled under 68, disable IP */
1084         case NETDEV_UNREGISTER:
1085                 inetdev_destroy(in_dev);
1086                 break;
1087         case NETDEV_CHANGENAME:
1088                 /* Do not notify about label change, this event is
1089                  * not interesting to applications using netlink.
1090                  */
1091                 inetdev_changename(dev, in_dev);
1092
1093 #ifdef CONFIG_SYSCTL
1094                 devinet_sysctl_unregister(&in_dev->cnf);
1095                 neigh_sysctl_unregister(in_dev->arp_parms);
1096                 neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
1097                                       NET_IPV4_NEIGH, "ipv4", NULL, NULL);
1098                 devinet_sysctl_register(in_dev, &in_dev->cnf);
1099 #endif
1100                 break;
1101         }
1102 out:
1103         return NOTIFY_DONE;
1104 }
1105
1106 static struct notifier_block ip_netdev_notifier = {
1107         .notifier_call =inetdev_event,
1108 };
1109
1110 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1111                             u32 pid, u32 seq, int event, unsigned int flags)
1112 {
1113         struct ifaddrmsg *ifm;
1114         struct nlmsghdr  *nlh;
1115
1116         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1117         if (nlh == NULL)
1118                 return -ENOBUFS;
1119
1120         ifm = nlmsg_data(nlh);
1121         ifm->ifa_family = AF_INET;
1122         ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1123         ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1124         ifm->ifa_scope = ifa->ifa_scope;
1125         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1126
1127         if (ifa->ifa_address)
1128                 NLA_PUT_U32(skb, IFA_ADDRESS, ifa->ifa_address);
1129
1130         if (ifa->ifa_local)
1131                 NLA_PUT_U32(skb, IFA_LOCAL, ifa->ifa_local);
1132
1133         if (ifa->ifa_broadcast)
1134                 NLA_PUT_U32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1135
1136         if (ifa->ifa_anycast)
1137                 NLA_PUT_U32(skb, IFA_ANYCAST, ifa->ifa_anycast);
1138
1139         if (ifa->ifa_label[0])
1140                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1141
1142         return nlmsg_end(skb, nlh);
1143
1144 nla_put_failure:
1145         return nlmsg_cancel(skb, nlh);
1146 }
1147
1148 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1149 {
1150         int idx, ip_idx;
1151         struct net_device *dev;
1152         struct in_device *in_dev;
1153         struct in_ifaddr *ifa;
1154         int s_ip_idx, s_idx = cb->args[0];
1155
1156         s_ip_idx = ip_idx = cb->args[1];
1157         read_lock(&dev_base_lock);
1158         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
1159                 if (idx < s_idx)
1160                         continue;
1161                 if (idx > s_idx)
1162                         s_ip_idx = 0;
1163                 rcu_read_lock();
1164                 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
1165                         rcu_read_unlock();
1166                         continue;
1167                 }
1168
1169                 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1170                      ifa = ifa->ifa_next, ip_idx++) {
1171                         if (ip_idx < s_ip_idx)
1172                                 continue;
1173                         if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1174                                              cb->nlh->nlmsg_seq,
1175                                              RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1176                                 rcu_read_unlock();
1177                                 goto done;
1178                         }
1179                 }
1180                 rcu_read_unlock();
1181         }
1182
1183 done:
1184         read_unlock(&dev_base_lock);
1185         cb->args[0] = idx;
1186         cb->args[1] = ip_idx;
1187
1188         return skb->len;
1189 }
1190
1191 static void rtmsg_ifa(int event, struct in_ifaddr* ifa)
1192 {
1193         struct sk_buff *skb;
1194
1195         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1196         if (skb == NULL)
1197                 netlink_set_err(rtnl, 0, RTNLGRP_IPV4_IFADDR, ENOBUFS);
1198         else if (inet_fill_ifaddr(skb, ifa, 0, 0, event, 0) < 0) {
1199                 kfree_skb(skb);
1200                 netlink_set_err(rtnl, 0, RTNLGRP_IPV4_IFADDR, EINVAL);
1201         } else
1202                 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV4_IFADDR, GFP_KERNEL);
1203 }
1204
1205 static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = {
1206         [RTM_NEWADDR  - RTM_BASE] = { .doit     = inet_rtm_newaddr,     },
1207         [RTM_DELADDR  - RTM_BASE] = { .doit     = inet_rtm_deladdr,     },
1208         [RTM_GETADDR  - RTM_BASE] = { .dumpit   = inet_dump_ifaddr,     },
1209         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet_rtm_newroute,    },
1210         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet_rtm_delroute,    },
1211         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet_rtm_getroute,
1212                                       .dumpit   = inet_dump_fib,        },
1213 #ifdef CONFIG_IP_MULTIPLE_TABLES
1214         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = fib4_rules_dump,      },
1215 #endif
1216 };
1217
1218 #ifdef CONFIG_SYSCTL
1219
1220 void inet_forward_change(void)
1221 {
1222         struct net_device *dev;
1223         int on = ipv4_devconf.forwarding;
1224
1225         ipv4_devconf.accept_redirects = !on;
1226         ipv4_devconf_dflt.forwarding = on;
1227
1228         read_lock(&dev_base_lock);
1229         for (dev = dev_base; dev; dev = dev->next) {
1230                 struct in_device *in_dev;
1231                 rcu_read_lock();
1232                 in_dev = __in_dev_get_rcu(dev);
1233                 if (in_dev)
1234                         in_dev->cnf.forwarding = on;
1235                 rcu_read_unlock();
1236         }
1237         read_unlock(&dev_base_lock);
1238
1239         rt_cache_flush(0);
1240 }
1241
1242 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1243                                   struct file* filp, void __user *buffer,
1244                                   size_t *lenp, loff_t *ppos)
1245 {
1246         int *valp = ctl->data;
1247         int val = *valp;
1248         int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1249
1250         if (write && *valp != val) {
1251                 if (valp == &ipv4_devconf.forwarding)
1252                         inet_forward_change();
1253                 else if (valp != &ipv4_devconf_dflt.forwarding)
1254                         rt_cache_flush(0);
1255         }
1256
1257         return ret;
1258 }
1259
1260 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1261                          struct file* filp, void __user *buffer,
1262                          size_t *lenp, loff_t *ppos)
1263 {
1264         int *valp = ctl->data;
1265         int val = *valp;
1266         int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1267
1268         if (write && *valp != val)
1269                 rt_cache_flush(0);
1270
1271         return ret;
1272 }
1273
1274 int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
1275                                   void __user *oldval, size_t __user *oldlenp,
1276                                   void __user *newval, size_t newlen,
1277                                   void **context)
1278 {
1279         int *valp = table->data;
1280         int new;
1281
1282         if (!newval || !newlen)
1283                 return 0;
1284
1285         if (newlen != sizeof(int))
1286                 return -EINVAL;
1287
1288         if (get_user(new, (int __user *)newval))
1289                 return -EFAULT;
1290
1291         if (new == *valp)
1292                 return 0;
1293
1294         if (oldval && oldlenp) {
1295                 size_t len;
1296
1297                 if (get_user(len, oldlenp))
1298                         return -EFAULT;
1299
1300                 if (len) {
1301                         if (len > table->maxlen)
1302                                 len = table->maxlen;
1303                         if (copy_to_user(oldval, valp, len))
1304                                 return -EFAULT;
1305                         if (put_user(len, oldlenp))
1306                                 return -EFAULT;
1307                 }
1308         }
1309
1310         *valp = new;
1311         rt_cache_flush(0);
1312         return 1;
1313 }
1314
1315
1316 static struct devinet_sysctl_table {
1317         struct ctl_table_header *sysctl_header;
1318         ctl_table               devinet_vars[__NET_IPV4_CONF_MAX];
1319         ctl_table               devinet_dev[2];
1320         ctl_table               devinet_conf_dir[2];
1321         ctl_table               devinet_proto_dir[2];
1322         ctl_table               devinet_root_dir[2];
1323 } devinet_sysctl = {
1324         .devinet_vars = {
1325                 {
1326                         .ctl_name       = NET_IPV4_CONF_FORWARDING,
1327                         .procname       = "forwarding",
1328                         .data           = &ipv4_devconf.forwarding,
1329                         .maxlen         = sizeof(int),
1330                         .mode           = 0644,
1331                         .proc_handler   = &devinet_sysctl_forward,
1332                 },
1333                 {
1334                         .ctl_name       = NET_IPV4_CONF_MC_FORWARDING,
1335                         .procname       = "mc_forwarding",
1336                         .data           = &ipv4_devconf.mc_forwarding,
1337                         .maxlen         = sizeof(int),
1338                         .mode           = 0444,
1339                         .proc_handler   = &proc_dointvec,
1340                 },
1341                 {
1342                         .ctl_name       = NET_IPV4_CONF_ACCEPT_REDIRECTS,
1343                         .procname       = "accept_redirects",
1344                         .data           = &ipv4_devconf.accept_redirects,
1345                         .maxlen         = sizeof(int),
1346                         .mode           = 0644,
1347                         .proc_handler   = &proc_dointvec,
1348                 },
1349                 {
1350                         .ctl_name       = NET_IPV4_CONF_SECURE_REDIRECTS,
1351                         .procname       = "secure_redirects",
1352                         .data           = &ipv4_devconf.secure_redirects,
1353                         .maxlen         = sizeof(int),
1354                         .mode           = 0644,
1355                         .proc_handler   = &proc_dointvec,
1356                 },
1357                 {
1358                         .ctl_name       = NET_IPV4_CONF_SHARED_MEDIA,
1359                         .procname       = "shared_media",
1360                         .data           = &ipv4_devconf.shared_media,
1361                         .maxlen         = sizeof(int),
1362                         .mode           = 0644,
1363                         .proc_handler   = &proc_dointvec,
1364                 },
1365                 {
1366                         .ctl_name       = NET_IPV4_CONF_RP_FILTER,
1367                         .procname       = "rp_filter",
1368                         .data           = &ipv4_devconf.rp_filter,
1369                         .maxlen         = sizeof(int),
1370                         .mode           = 0644,
1371                         .proc_handler   = &proc_dointvec,
1372                 },
1373                 {
1374                         .ctl_name       = NET_IPV4_CONF_SEND_REDIRECTS,
1375                         .procname       = "send_redirects",
1376                         .data           = &ipv4_devconf.send_redirects,
1377                         .maxlen         = sizeof(int),
1378                         .mode           = 0644,
1379                         .proc_handler   = &proc_dointvec,
1380                 },
1381                 {
1382                         .ctl_name       = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE,
1383                         .procname       = "accept_source_route",
1384                         .data           = &ipv4_devconf.accept_source_route,
1385                         .maxlen         = sizeof(int),
1386                         .mode           = 0644,
1387                         .proc_handler   = &proc_dointvec,
1388                 },
1389                 {
1390                         .ctl_name       = NET_IPV4_CONF_PROXY_ARP,
1391                         .procname       = "proxy_arp",
1392                         .data           = &ipv4_devconf.proxy_arp,
1393                         .maxlen         = sizeof(int),
1394                         .mode           = 0644,
1395                         .proc_handler   = &proc_dointvec,
1396                 },
1397                 {
1398                         .ctl_name       = NET_IPV4_CONF_MEDIUM_ID,
1399                         .procname       = "medium_id",
1400                         .data           = &ipv4_devconf.medium_id,
1401                         .maxlen         = sizeof(int),
1402                         .mode           = 0644,
1403                         .proc_handler   = &proc_dointvec,
1404                 },
1405                 {
1406                         .ctl_name       = NET_IPV4_CONF_BOOTP_RELAY,
1407                         .procname       = "bootp_relay",
1408                         .data           = &ipv4_devconf.bootp_relay,
1409                         .maxlen         = sizeof(int),
1410                         .mode           = 0644,
1411                         .proc_handler   = &proc_dointvec,
1412                 },
1413                 {
1414                         .ctl_name       = NET_IPV4_CONF_LOG_MARTIANS,
1415                         .procname       = "log_martians",
1416                         .data           = &ipv4_devconf.log_martians,
1417                         .maxlen         = sizeof(int),
1418                         .mode           = 0644,
1419                         .proc_handler   = &proc_dointvec,
1420                 },
1421                 {
1422                         .ctl_name       = NET_IPV4_CONF_TAG,
1423                         .procname       = "tag",
1424                         .data           = &ipv4_devconf.tag,
1425                         .maxlen         = sizeof(int),
1426                         .mode           = 0644,
1427                         .proc_handler   = &proc_dointvec,
1428                 },
1429                 {
1430                         .ctl_name       = NET_IPV4_CONF_ARPFILTER,
1431                         .procname       = "arp_filter",
1432                         .data           = &ipv4_devconf.arp_filter,
1433                         .maxlen         = sizeof(int),
1434                         .mode           = 0644,
1435                         .proc_handler   = &proc_dointvec,
1436                 },
1437                 {
1438                         .ctl_name       = NET_IPV4_CONF_ARP_ANNOUNCE,
1439                         .procname       = "arp_announce",
1440                         .data           = &ipv4_devconf.arp_announce,
1441                         .maxlen         = sizeof(int),
1442                         .mode           = 0644,
1443                         .proc_handler   = &proc_dointvec,
1444                 },
1445                 {
1446                         .ctl_name       = NET_IPV4_CONF_ARP_IGNORE,
1447                         .procname       = "arp_ignore",
1448                         .data           = &ipv4_devconf.arp_ignore,
1449                         .maxlen         = sizeof(int),
1450                         .mode           = 0644,
1451                         .proc_handler   = &proc_dointvec,
1452                 },
1453                 {
1454                         .ctl_name       = NET_IPV4_CONF_ARP_ACCEPT,
1455                         .procname       = "arp_accept",
1456                         .data           = &ipv4_devconf.arp_accept,
1457                         .maxlen         = sizeof(int),
1458                         .mode           = 0644,
1459                         .proc_handler   = &proc_dointvec,
1460                 },
1461                 {
1462                         .ctl_name       = NET_IPV4_CONF_NOXFRM,
1463                         .procname       = "disable_xfrm",
1464                         .data           = &ipv4_devconf.no_xfrm,
1465                         .maxlen         = sizeof(int),
1466                         .mode           = 0644,
1467                         .proc_handler   = &ipv4_doint_and_flush,
1468                         .strategy       = &ipv4_doint_and_flush_strategy,
1469                 },
1470                 {
1471                         .ctl_name       = NET_IPV4_CONF_NOPOLICY,
1472                         .procname       = "disable_policy",
1473                         .data           = &ipv4_devconf.no_policy,
1474                         .maxlen         = sizeof(int),
1475                         .mode           = 0644,
1476                         .proc_handler   = &ipv4_doint_and_flush,
1477                         .strategy       = &ipv4_doint_and_flush_strategy,
1478                 },
1479                 {
1480                         .ctl_name       = NET_IPV4_CONF_FORCE_IGMP_VERSION,
1481                         .procname       = "force_igmp_version",
1482                         .data           = &ipv4_devconf.force_igmp_version,
1483                         .maxlen         = sizeof(int),
1484                         .mode           = 0644,
1485                         .proc_handler   = &ipv4_doint_and_flush,
1486                         .strategy       = &ipv4_doint_and_flush_strategy,
1487                 },
1488                 {
1489                         .ctl_name       = NET_IPV4_CONF_PROMOTE_SECONDARIES,
1490                         .procname       = "promote_secondaries",
1491                         .data           = &ipv4_devconf.promote_secondaries,
1492                         .maxlen         = sizeof(int),
1493                         .mode           = 0644,
1494                         .proc_handler   = &ipv4_doint_and_flush,
1495                         .strategy       = &ipv4_doint_and_flush_strategy,
1496                 },
1497         },
1498         .devinet_dev = {
1499                 {
1500                         .ctl_name       = NET_PROTO_CONF_ALL,
1501                         .procname       = "all",
1502                         .mode           = 0555,
1503                         .child          = devinet_sysctl.devinet_vars,
1504                 },
1505         },
1506         .devinet_conf_dir = {
1507                 {
1508                         .ctl_name       = NET_IPV4_CONF,
1509                         .procname       = "conf",
1510                         .mode           = 0555,
1511                         .child          = devinet_sysctl.devinet_dev,
1512                 },
1513         },
1514         .devinet_proto_dir = {
1515                 {
1516                         .ctl_name       = NET_IPV4,
1517                         .procname       = "ipv4",
1518                         .mode           = 0555,
1519                         .child          = devinet_sysctl.devinet_conf_dir,
1520                 },
1521         },
1522         .devinet_root_dir = {
1523                 {
1524                         .ctl_name       = CTL_NET,
1525                         .procname       = "net",
1526                         .mode           = 0555,
1527                         .child          = devinet_sysctl.devinet_proto_dir,
1528                 },
1529         },
1530 };
1531
1532 static void devinet_sysctl_register(struct in_device *in_dev,
1533                                     struct ipv4_devconf *p)
1534 {
1535         int i;
1536         struct net_device *dev = in_dev ? in_dev->dev : NULL;
1537         struct devinet_sysctl_table *t = kmalloc(sizeof(*t), GFP_KERNEL);
1538         char *dev_name = NULL;
1539
1540         if (!t)
1541                 return;
1542         memcpy(t, &devinet_sysctl, sizeof(*t));
1543         for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1544                 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1545                 t->devinet_vars[i].de = NULL;
1546         }
1547
1548         if (dev) {
1549                 dev_name = dev->name;
1550                 t->devinet_dev[0].ctl_name = dev->ifindex;
1551         } else {
1552                 dev_name = "default";
1553                 t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
1554         }
1555
1556         /*
1557          * Make a copy of dev_name, because '.procname' is regarded as const
1558          * by sysctl and we wouldn't want anyone to change it under our feet
1559          * (see SIOCSIFNAME).
1560          */
1561         dev_name = kstrdup(dev_name, GFP_KERNEL);
1562         if (!dev_name)
1563             goto free;
1564
1565         t->devinet_dev[0].procname    = dev_name;
1566         t->devinet_dev[0].child       = t->devinet_vars;
1567         t->devinet_dev[0].de          = NULL;
1568         t->devinet_conf_dir[0].child  = t->devinet_dev;
1569         t->devinet_conf_dir[0].de     = NULL;
1570         t->devinet_proto_dir[0].child = t->devinet_conf_dir;
1571         t->devinet_proto_dir[0].de    = NULL;
1572         t->devinet_root_dir[0].child  = t->devinet_proto_dir;
1573         t->devinet_root_dir[0].de     = NULL;
1574
1575         t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0);
1576         if (!t->sysctl_header)
1577             goto free_procname;
1578
1579         p->sysctl = t;
1580         return;
1581
1582         /* error path */
1583  free_procname:
1584         kfree(dev_name);
1585  free:
1586         kfree(t);
1587         return;
1588 }
1589
1590 static void devinet_sysctl_unregister(struct ipv4_devconf *p)
1591 {
1592         if (p->sysctl) {
1593                 struct devinet_sysctl_table *t = p->sysctl;
1594                 p->sysctl = NULL;
1595                 unregister_sysctl_table(t->sysctl_header);
1596                 kfree(t->devinet_dev[0].procname);
1597                 kfree(t);
1598         }
1599 }
1600 #endif
1601
1602 void __init devinet_init(void)
1603 {
1604         register_gifconf(PF_INET, inet_gifconf);
1605         register_netdevice_notifier(&ip_netdev_notifier);
1606         rtnetlink_links[PF_INET] = inet_rtnetlink_table;
1607 #ifdef CONFIG_SYSCTL
1608         devinet_sysctl.sysctl_header =
1609                 register_sysctl_table(devinet_sysctl.devinet_root_dir, 0);
1610         devinet_sysctl_register(NULL, &ipv4_devconf_dflt);
1611 #endif
1612 }
1613
1614 EXPORT_SYMBOL(in_dev_finish_destroy);
1615 EXPORT_SYMBOL(inet_select_addr);
1616 EXPORT_SYMBOL(inetdev_by_index);
1617 EXPORT_SYMBOL(register_inetaddr_notifier);
1618 EXPORT_SYMBOL(unregister_inetaddr_notifier);