net/ipv4/devinet.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      NET3    IP device support routines.
   4  *
   5  *      Derived from the IP parts of dev.c 1.0.19
   6  *              Authors:        Ross Biro
   7  *                              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
   8  *                              Mark Evans, <evansmp@uhura.aston.ac.uk>
   9  *
  10  *      Additional Authors:
  11  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
  12  *              Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  13  *
  14  *      Changes:
  15  *              Alexey Kuznetsov:       pa_* fields are replaced with ifaddr
  16  *                                      lists.
  17  *              Cyrus Durgin:           updated for kmod
  18  *              Matthias Andree:        in devinet_ioctl, compare label and
  19  *                                      address (4.4BSD alias style support),
  20  *                                      fall back to comparing just the label
  21  *                                      if no match found.
  22  */
  23
  24
  25 #include <linux/uaccess.h>
  26 #include <linux/bitops.h>
  27 #include <linux/capability.h>
  28 #include <linux/module.h>
  29 #include <linux/types.h>
  30 #include <linux/kernel.h>
  31 #include <linux/sched/signal.h>
  32 #include <linux/string.h>
  33 #include <linux/mm.h>
  34 #include <linux/socket.h>
  35 #include <linux/sockios.h>
  36 #include <linux/in.h>
  37 #include <linux/errno.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/if_addr.h>
  40 #include <linux/if_ether.h>
  41 #include <linux/inet.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/etherdevice.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/init.h>
  46 #include <linux/notifier.h>
  47 #include <linux/inetdevice.h>
  48 #include <linux/igmp.h>
  49 #include <linux/slab.h>
  50 #include <linux/hash.h>
  51 #ifdef CONFIG_SYSCTL
  52 #include <linux/sysctl.h>
  53 #endif
  54 #include <linux/kmod.h>
  55 #include <linux/netconf.h>
  56
  57 #include <net/arp.h>
  58 #include <net/ip.h>
  59 #include <net/route.h>
  60 #include <net/ip_fib.h>
  61 #include <net/rtnetlink.h>
  62 #include <net/net_namespace.h>
  63 #include <net/addrconf.h>
  64
  65 #define IPV6ONLY_FLAGS  \
  66                 (IFA_F_NODAD | IFA_F_OPTIMISTIC | IFA_F_DADFAILED | \
  67                  IFA_F_HOMEADDRESS | IFA_F_TENTATIVE | \
  68                  IFA_F_MANAGETEMPADDR | IFA_F_STABLE_PRIVACY)
  69
  70 static struct ipv4_devconf ipv4_devconf = {
  71         .data = {
  72                 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
  73                 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
  74                 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
  75                 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
  76                 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
  77                 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] =  1000 /*ms*/,
  78         },
  79 };
  80
  81 static struct ipv4_devconf ipv4_devconf_dflt = {
  82         .data = {
  83                 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
  84                 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
  85                 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
  86                 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
  87                 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
  88                 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
  89                 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] =  1000 /*ms*/,
  90         },
  91 };
  92
  93 #define IPV4_DEVCONF_DFLT(net, attr) \
  94         IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
  95
  96 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
  97         [IFA_LOCAL]             = { .type = NLA_U32 },
  98         [IFA_ADDRESS]           = { .type = NLA_U32 },
  99         [IFA_BROADCAST]         = { .type = NLA_U32 },
 100         [IFA_LABEL]             = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
 101         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
 102         [IFA_FLAGS]             = { .type = NLA_U32 },
 103         [IFA_RT_PRIORITY]       = { .type = NLA_U32 },
 104         [IFA_TARGET_NETNSID]    = { .type = NLA_S32 },
 105 };
 106
 107 struct inet_fill_args {
 108         u32 portid;
 109         u32 seq;
 110         int event;
 111         unsigned int flags;
 112         int netnsid;
 113         int ifindex;
 114 };
 115
 116 #define IN4_ADDR_HSIZE_SHIFT    8
 117 #define IN4_ADDR_HSIZE          (1U << IN4_ADDR_HSIZE_SHIFT)
 118
 119 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
 120
 121 static u32 inet_addr_hash(const struct net *net, __be32 addr)
 122 {
 123         u32 val = (__force u32) addr ^ net_hash_mix(net);
 124
 125         return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
 126 }
 127
 128 static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
 129 {
 130         u32 hash = inet_addr_hash(net, ifa->ifa_local);
 131
 132         ASSERT_RTNL();
 133         hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
 134 }
 135
 136 static void inet_hash_remove(struct in_ifaddr *ifa)
 137 {
 138         ASSERT_RTNL();
 139         hlist_del_init_rcu(&ifa->hash);
 140 }
 141
 142 /**
 143  * __ip_dev_find - find the first device with a given source address.
 144  * @net: the net namespace
 145  * @addr: the source address
 146  * @devref: if true, take a reference on the found device
 147  *
 148  * If a caller uses devref=false, it should be protected by RCU, or RTNL
 149  */
 150 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
 151 {
 152         struct net_device *result = NULL;
 153         struct in_ifaddr *ifa;
 154
 155         rcu_read_lock();
 156         ifa = inet_lookup_ifaddr_rcu(net, addr);
 157         if (!ifa) {
 158                 struct flowi4 fl4 = { .daddr = addr };
 159                 struct fib_result res = { 0 };
 160                 struct fib_table *local;
 161
 162                 /* Fallback to FIB local table so that communication
 163                  * over loopback subnets work.
 164                  */
 165                 local = fib_get_table(net, RT_TABLE_LOCAL);
 166                 if (local &&
 167                     !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
 168                     res.type == RTN_LOCAL)
 169                         result = FIB_RES_DEV(res);
 170         } else {
 171                 result = ifa->ifa_dev->dev;
 172         }
 173         if (result && devref)
 174                 dev_hold(result);
 175         rcu_read_unlock();
 176         return result;
 177 }
 178 EXPORT_SYMBOL(__ip_dev_find);
 179
 180 /* called under RCU lock */
 181 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
 182 {
 183         u32 hash = inet_addr_hash(net, addr);
 184         struct in_ifaddr *ifa;
 185
 186         hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
 187                 if (ifa->ifa_local == addr &&
 188                     net_eq(dev_net(ifa->ifa_dev->dev), net))
 189                         return ifa;
 190
 191         return NULL;
 192 }
 193
 194 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
 195
 196 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
 197 static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
 198 static void inet_del_ifa(struct in_device *in_dev,
 199                          struct in_ifaddr __rcu **ifap,
 200                          int destroy);
 201 #ifdef CONFIG_SYSCTL
 202 static int devinet_sysctl_register(struct in_device *idev);
 203 static void devinet_sysctl_unregister(struct in_device *idev);
 204 #else
 205 static int devinet_sysctl_register(struct in_device *idev)
 206 {
 207         return 0;
 208 }
 209 static void devinet_sysctl_unregister(struct in_device *idev)
 210 {
 211 }
 212 #endif
 213
 214 /* Locks all the inet devices. */
 215
 216 static struct in_ifaddr *inet_alloc_ifa(void)
 217 {
 218         return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
 219 }
 220
 221 static void inet_rcu_free_ifa(struct rcu_head *head)
 222 {
 223         struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
 224         if (ifa->ifa_dev)
 225                 in_dev_put(ifa->ifa_dev);
 226         kfree(ifa);
 227 }
 228
 229 static void inet_free_ifa(struct in_ifaddr *ifa)
 230 {
 231         call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
 232 }
 233
 234 void in_dev_finish_destroy(struct in_device *idev)
 235 {
 236         struct net_device *dev = idev->dev;
 237
 238         WARN_ON(idev->ifa_list);
 239         WARN_ON(idev->mc_list);
 240         kfree(rcu_dereference_protected(idev->mc_hash, 1));
 241 #ifdef NET_REFCNT_DEBUG
 242         pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
 243 #endif
 244         dev_put(dev);
 245         if (!idev->dead)
 246                 pr_err("Freeing alive in_device %p\n", idev);
 247         else
 248                 kfree(idev);
 249 }
 250 EXPORT_SYMBOL(in_dev_finish_destroy);
 251
 252 static struct in_device *inetdev_init(struct net_device *dev)
 253 {
 254         struct in_device *in_dev;
 255         int err = -ENOMEM;
 256
 257         ASSERT_RTNL();
 258
 259         in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
 260         if (!in_dev)
 261                 goto out;
 262         memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
 263                         sizeof(in_dev->cnf));
 264         in_dev->cnf.sysctl = NULL;
 265         in_dev->dev = dev;
 266         in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
 267         if (!in_dev->arp_parms)
 268                 goto out_kfree;
 269         if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
 270                 dev_disable_lro(dev);
 271         /* Reference in_dev->dev */
 272         dev_hold(dev);
 273         /* Account for reference dev->ip_ptr (below) */
 274         refcount_set(&in_dev->refcnt, 1);
 275
 276         err = devinet_sysctl_register(in_dev);
 277         if (err) {
 278                 in_dev->dead = 1;
 279                 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
 280                 in_dev_put(in_dev);
 281                 in_dev = NULL;
 282                 goto out;
 283         }
 284         ip_mc_init_dev(in_dev);
 285         if (dev->flags & IFF_UP)
 286                 ip_mc_up(in_dev);
 287
 288         /* we can receive as soon as ip_ptr is set -- do this last */
 289         rcu_assign_pointer(dev->ip_ptr, in_dev);
 290 out:
 291         return in_dev ?: ERR_PTR(err);
 292 out_kfree:
 293         kfree(in_dev);
 294         in_dev = NULL;
 295         goto out;
 296 }
 297
 298 static void in_dev_rcu_put(struct rcu_head *head)
 299 {
 300         struct in_device *idev = container_of(head, struct in_device, rcu_head);
 301         in_dev_put(idev);
 302 }
 303
 304 static void inetdev_destroy(struct in_device *in_dev)
 305 {
 306         struct net_device *dev;
 307         struct in_ifaddr *ifa;
 308
 309         ASSERT_RTNL();
 310
 311         dev = in_dev->dev;
 312
 313         in_dev->dead = 1;
 314
 315         ip_mc_destroy_dev(in_dev);
 316
 317         while ((ifa = rtnl_dereference(in_dev->ifa_list)) != NULL) {
 318                 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
 319                 inet_free_ifa(ifa);
 320         }
 321
 322         RCU_INIT_POINTER(dev->ip_ptr, NULL);
 323
 324         devinet_sysctl_unregister(in_dev);
 325         neigh_parms_release(&arp_tbl, in_dev->arp_parms);
 326         arp_ifdown(dev);
 327
 328         call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
 329 }
 330
 331 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
 332 {
 333         const struct in_ifaddr *ifa;
 334
 335         rcu_read_lock();
 336         in_dev_for_each_ifa_rcu(ifa, in_dev) {
 337                 if (inet_ifa_match(a, ifa)) {
 338                         if (!b || inet_ifa_match(b, ifa)) {
 339                                 rcu_read_unlock();
 340                                 return 1;
 341                         }
 342                 }
 343         }
 344         rcu_read_unlock();
 345         return 0;
 346 }
 347
 348 static void __inet_del_ifa(struct in_device *in_dev,
 349                            struct in_ifaddr __rcu **ifap,
 350                            int destroy, struct nlmsghdr *nlh, u32 portid)
 351 {
 352         struct in_ifaddr *promote = NULL;
 353         struct in_ifaddr *ifa, *ifa1;
 354         struct in_ifaddr __rcu **last_prim;
 355         struct in_ifaddr *prev_prom = NULL;
 356         int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
 357
 358         ASSERT_RTNL();
 359
 360         ifa1 = rtnl_dereference(*ifap);
 361         last_prim = ifap;
 362         if (in_dev->dead)
 363                 goto no_promotions;
 364
 365         /* 1. Deleting primary ifaddr forces deletion all secondaries
 366          * unless alias promotion is set
 367          **/
 368
 369         if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
 370                 struct in_ifaddr __rcu **ifap1 = &ifa1->ifa_next;
 371
 372                 while ((ifa = rtnl_dereference(*ifap1)) != NULL) {
 373                         if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
 374                             ifa1->ifa_scope <= ifa->ifa_scope)
 375                                 last_prim = &ifa->ifa_next;
 376
 377                         if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
 378                             ifa1->ifa_mask != ifa->ifa_mask ||
 379                             !inet_ifa_match(ifa1->ifa_address, ifa)) {
 380                                 ifap1 = &ifa->ifa_next;
 381                                 prev_prom = ifa;
 382                                 continue;
 383                         }
 384
 385                         if (!do_promote) {
 386                                 inet_hash_remove(ifa);
 387                                 *ifap1 = ifa->ifa_next;
 388
 389                                 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
 390                                 blocking_notifier_call_chain(&inetaddr_chain,
 391                                                 NETDEV_DOWN, ifa);
 392                                 inet_free_ifa(ifa);
 393                         } else {
 394                                 promote = ifa;
 395                                 break;
 396                         }
 397                 }
 398         }
 399
 400         /* On promotion all secondaries from subnet are changing
 401          * the primary IP, we must remove all their routes silently
 402          * and later to add them back with new prefsrc. Do this
 403          * while all addresses are on the device list.
 404          */
 405         for (ifa = promote; ifa; ifa = rtnl_dereference(ifa->ifa_next)) {
 406                 if (ifa1->ifa_mask == ifa->ifa_mask &&
 407                     inet_ifa_match(ifa1->ifa_address, ifa))
 408                         fib_del_ifaddr(ifa, ifa1);
 409         }
 410
 411 no_promotions:
 412         /* 2. Unlink it */
 413
 414         *ifap = ifa1->ifa_next;
 415         inet_hash_remove(ifa1);
 416
 417         /* 3. Announce address deletion */
 418
 419         /* Send message first, then call notifier.
 420            At first sight, FIB update triggered by notifier
 421            will refer to already deleted ifaddr, that could confuse
 422            netlink listeners. It is not true: look, gated sees
 423            that route deleted and if it still thinks that ifaddr
 424            is valid, it will try to restore deleted routes... Grr.
 425            So that, this order is correct.
 426          */
 427         rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
 428         blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
 429
 430         if (promote) {
 431                 struct in_ifaddr *next_sec;
 432
 433                 next_sec = rtnl_dereference(promote->ifa_next);
 434                 if (prev_prom) {
 435                         struct in_ifaddr *last_sec;
 436
 437                         rcu_assign_pointer(prev_prom->ifa_next, next_sec);
 438
 439                         last_sec = rtnl_dereference(*last_prim);
 440                         rcu_assign_pointer(promote->ifa_next, last_sec);
 441                         rcu_assign_pointer(*last_prim, promote);
 442                 }
 443
 444                 promote->ifa_flags &= ~IFA_F_SECONDARY;
 445                 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
 446                 blocking_notifier_call_chain(&inetaddr_chain,
 447                                 NETDEV_UP, promote);
 448                 for (ifa = next_sec; ifa;
 449                      ifa = rtnl_dereference(ifa->ifa_next)) {
 450                         if (ifa1->ifa_mask != ifa->ifa_mask ||
 451                             !inet_ifa_match(ifa1->ifa_address, ifa))
 452                                         continue;
 453                         fib_add_ifaddr(ifa);
 454                 }
 455
 456         }
 457         if (destroy)
 458                 inet_free_ifa(ifa1);
 459 }
 460
 461 static void inet_del_ifa(struct in_device *in_dev,
 462                          struct in_ifaddr __rcu **ifap,
 463                          int destroy)
 464 {
 465         __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
 466 }
 467
 468 static void check_lifetime(struct work_struct *work);
 469
 470 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
 471
 472 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
 473                              u32 portid, struct netlink_ext_ack *extack)
 474 {
 475         struct in_ifaddr __rcu **last_primary, **ifap;
 476         struct in_device *in_dev = ifa->ifa_dev;
 477         struct in_validator_info ivi;
 478         struct in_ifaddr *ifa1;
 479         int ret;
 480
 481         ASSERT_RTNL();
 482
 483         if (!ifa->ifa_local) {
 484                 inet_free_ifa(ifa);
 485                 return 0;
 486         }
 487
 488         ifa->ifa_flags &= ~IFA_F_SECONDARY;
 489         last_primary = &in_dev->ifa_list;
 490
 491         /* Don't set IPv6 only flags to IPv4 addresses */
 492         ifa->ifa_flags &= ~IPV6ONLY_FLAGS;
 493
 494         ifap = &in_dev->ifa_list;
 495         ifa1 = rtnl_dereference(*ifap);
 496
 497         while (ifa1) {
 498                 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
 499                     ifa->ifa_scope <= ifa1->ifa_scope)
 500                         last_primary = &ifa1->ifa_next;
 501                 if (ifa1->ifa_mask == ifa->ifa_mask &&
 502                     inet_ifa_match(ifa1->ifa_address, ifa)) {
 503                         if (ifa1->ifa_local == ifa->ifa_local) {
 504                                 inet_free_ifa(ifa);
 505                                 return -EEXIST;
 506                         }
 507                         if (ifa1->ifa_scope != ifa->ifa_scope) {
 508                                 inet_free_ifa(ifa);
 509                                 return -EINVAL;
 510                         }
 511                         ifa->ifa_flags |= IFA_F_SECONDARY;
 512                 }
 513
 514                 ifap = &ifa1->ifa_next;
 515                 ifa1 = rtnl_dereference(*ifap);
 516         }
 517
 518         /* Allow any devices that wish to register ifaddr validtors to weigh
 519          * in now, before changes are committed.  The rntl lock is serializing
 520          * access here, so the state should not change between a validator call
 521          * and a final notify on commit.  This isn't invoked on promotion under
 522          * the assumption that validators are checking the address itself, and
 523          * not the flags.
 524          */
 525         ivi.ivi_addr = ifa->ifa_address;
 526         ivi.ivi_dev = ifa->ifa_dev;
 527         ivi.extack = extack;
 528         ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
 529                                            NETDEV_UP, &ivi);
 530         ret = notifier_to_errno(ret);
 531         if (ret) {
 532                 inet_free_ifa(ifa);
 533                 return ret;
 534         }
 535
 536         if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
 537                 prandom_seed((__force u32) ifa->ifa_local);
 538                 ifap = last_primary;
 539         }
 540
 541         rcu_assign_pointer(ifa->ifa_next, *ifap);
 542         rcu_assign_pointer(*ifap, ifa);
 543
 544         inet_hash_insert(dev_net(in_dev->dev), ifa);
 545
 546         cancel_delayed_work(&check_lifetime_work);
 547         queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
 548
 549         /* Send message first, then call notifier.
 550            Notifier will trigger FIB update, so that
 551            listeners of netlink will know about new ifaddr */
 552         rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
 553         blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
 554
 555         return 0;
 556 }
 557
 558 static int inet_insert_ifa(struct in_ifaddr *ifa)
 559 {
 560         return __inet_insert_ifa(ifa, NULL, 0, NULL);
 561 }
 562
 563 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
 564 {
 565         struct in_device *in_dev = __in_dev_get_rtnl(dev);
 566
 567         ASSERT_RTNL();
 568
 569         if (!in_dev) {
 570                 inet_free_ifa(ifa);
 571                 return -ENOBUFS;
 572         }
 573         ipv4_devconf_setall(in_dev);
 574         neigh_parms_data_state_setall(in_dev->arp_parms);
 575         if (ifa->ifa_dev != in_dev) {
 576                 WARN_ON(ifa->ifa_dev);
 577                 in_dev_hold(in_dev);
 578                 ifa->ifa_dev = in_dev;
 579         }
 580         if (ipv4_is_loopback(ifa->ifa_local))
 581                 ifa->ifa_scope = RT_SCOPE_HOST;
 582         return inet_insert_ifa(ifa);
 583 }
 584
 585 /* Caller must hold RCU or RTNL :
 586  * We dont take a reference on found in_device
 587  */
 588 struct in_device *inetdev_by_index(struct net *net, int ifindex)
 589 {
 590         struct net_device *dev;
 591         struct in_device *in_dev = NULL;
 592
 593         rcu_read_lock();
 594         dev = dev_get_by_index_rcu(net, ifindex);
 595         if (dev)
 596                 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
 597         rcu_read_unlock();
 598         return in_dev;
 599 }
 600 EXPORT_SYMBOL(inetdev_by_index);
 601
 602 /* Called only from RTNL semaphored context. No locks. */
 603
 604 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
 605                                     __be32 mask)
 606 {
 607         struct in_ifaddr *ifa;
 608
 609         ASSERT_RTNL();
 610
 611         in_dev_for_each_ifa_rtnl(ifa, in_dev) {
 612                 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
 613                         return ifa;
 614         }
 615         return NULL;
 616 }
 617
 618 static int ip_mc_autojoin_config(struct net *net, bool join,
 619                                  const struct in_ifaddr *ifa)
 620 {
 621 #if defined(CONFIG_IP_MULTICAST)
 622         struct ip_mreqn mreq = {
 623                 .imr_multiaddr.s_addr = ifa->ifa_address,
 624                 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
 625         };
 626         struct sock *sk = net->ipv4.mc_autojoin_sk;
 627         int ret;
 628
 629         ASSERT_RTNL();
 630
 631         lock_sock(sk);
 632         if (join)
 633                 ret = ip_mc_join_group(sk, &mreq);
 634         else
 635                 ret = ip_mc_leave_group(sk, &mreq);
 636         release_sock(sk);
 637
 638         return ret;
 639 #else
 640         return -EOPNOTSUPP;
 641 #endif
 642 }
 643
 644 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
 645                             struct netlink_ext_ack *extack)
 646 {
 647         struct net *net = sock_net(skb->sk);
 648         struct in_ifaddr __rcu **ifap;
 649         struct nlattr *tb[IFA_MAX+1];
 650         struct in_device *in_dev;
 651         struct ifaddrmsg *ifm;
 652         struct in_ifaddr *ifa;
 653
 654         int err = -EINVAL;
 655
 656         ASSERT_RTNL();
 657
 658         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
 659                                      ifa_ipv4_policy, extack);
 660         if (err < 0)
 661                 goto errout;
 662
 663         ifm = nlmsg_data(nlh);
 664         in_dev = inetdev_by_index(net, ifm->ifa_index);
 665         if (!in_dev) {
 666                 err = -ENODEV;
 667                 goto errout;
 668         }
 669
 670         for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL;
 671              ifap = &ifa->ifa_next) {
 672                 if (tb[IFA_LOCAL] &&
 673                     ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
 674                         continue;
 675
 676                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 677                         continue;
 678
 679                 if (tb[IFA_ADDRESS] &&
 680                     (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
 681                     !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
 682                         continue;
 683
 684                 if (ipv4_is_multicast(ifa->ifa_address))
 685                         ip_mc_autojoin_config(net, false, ifa);
 686                 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
 687                 return 0;
 688         }
 689
 690         err = -EADDRNOTAVAIL;
 691 errout:
 692         return err;
 693 }
 694
 695 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 696
 697 static void check_lifetime(struct work_struct *work)
 698 {
 699         unsigned long now, next, next_sec, next_sched;
 700         struct in_ifaddr *ifa;
 701         struct hlist_node *n;
 702         int i;
 703
 704         now = jiffies;
 705         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
 706
 707         for (i = 0; i < IN4_ADDR_HSIZE; i++) {
 708                 bool change_needed = false;
 709
 710                 rcu_read_lock();
 711                 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
 712                         unsigned long age;
 713
 714                         if (ifa->ifa_flags & IFA_F_PERMANENT)
 715                                 continue;
 716
 717                         /* We try to batch several events at once. */
 718                         age = (now - ifa->ifa_tstamp +
 719                                ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
 720
 721                         if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
 722                             age >= ifa->ifa_valid_lft) {
 723                                 change_needed = true;
 724                         } else if (ifa->ifa_preferred_lft ==
 725                                    INFINITY_LIFE_TIME) {
 726                                 continue;
 727                         } else if (age >= ifa->ifa_preferred_lft) {
 728                                 if (time_before(ifa->ifa_tstamp +
 729                                                 ifa->ifa_valid_lft * HZ, next))
 730                                         next = ifa->ifa_tstamp +
 731                                                ifa->ifa_valid_lft * HZ;
 732
 733                                 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
 734                                         change_needed = true;
 735                         } else if (time_before(ifa->ifa_tstamp +
 736                                                ifa->ifa_preferred_lft * HZ,
 737                                                next)) {
 738                                 next = ifa->ifa_tstamp +
 739                                        ifa->ifa_preferred_lft * HZ;
 740                         }
 741                 }
 742                 rcu_read_unlock();
 743                 if (!change_needed)
 744                         continue;
 745                 rtnl_lock();
 746                 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
 747                         unsigned long age;
 748
 749                         if (ifa->ifa_flags & IFA_F_PERMANENT)
 750                                 continue;
 751
 752                         /* We try to batch several events at once. */
 753                         age = (now - ifa->ifa_tstamp +
 754                                ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
 755
 756                         if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
 757                             age >= ifa->ifa_valid_lft) {
 758                                 struct in_ifaddr __rcu **ifap;
 759                                 struct in_ifaddr *tmp;
 760
 761                                 ifap = &ifa->ifa_dev->ifa_list;
 762                                 tmp = rtnl_dereference(*ifap);
 763                                 while (tmp) {
 764                                         if (tmp == ifa) {
 765                                                 inet_del_ifa(ifa->ifa_dev,
 766                                                              ifap, 1);
 767                                                 break;
 768                                         }
 769                                         ifap = &tmp->ifa_next;
 770                                         tmp = rtnl_dereference(*ifap);
 771                                 }
 772                         } else if (ifa->ifa_preferred_lft !=
 773                                    INFINITY_LIFE_TIME &&
 774                                    age >= ifa->ifa_preferred_lft &&
 775                                    !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
 776                                 ifa->ifa_flags |= IFA_F_DEPRECATED;
 777                                 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
 778                         }
 779                 }
 780                 rtnl_unlock();
 781         }
 782
 783         next_sec = round_jiffies_up(next);
 784         next_sched = next;
 785
 786         /* If rounded timeout is accurate enough, accept it. */
 787         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
 788                 next_sched = next_sec;
 789
 790         now = jiffies;
 791         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
 792         if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
 793                 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
 794
 795         queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
 796                         next_sched - now);
 797 }
 798
 799 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
 800                              __u32 prefered_lft)
 801 {
 802         unsigned long timeout;
 803
 804         ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
 805
 806         timeout = addrconf_timeout_fixup(valid_lft, HZ);
 807         if (addrconf_finite_timeout(timeout))
 808                 ifa->ifa_valid_lft = timeout;
 809         else
 810                 ifa->ifa_flags |= IFA_F_PERMANENT;
 811
 812         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
 813         if (addrconf_finite_timeout(timeout)) {
 814                 if (timeout == 0)
 815                         ifa->ifa_flags |= IFA_F_DEPRECATED;
 816                 ifa->ifa_preferred_lft = timeout;
 817         }
 818         ifa->ifa_tstamp = jiffies;
 819         if (!ifa->ifa_cstamp)
 820                 ifa->ifa_cstamp = ifa->ifa_tstamp;
 821 }
 822
 823 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
 824                                        __u32 *pvalid_lft, __u32 *pprefered_lft,
 825                                        struct netlink_ext_ack *extack)
 826 {
 827         struct nlattr *tb[IFA_MAX+1];
 828         struct in_ifaddr *ifa;
 829         struct ifaddrmsg *ifm;
 830         struct net_device *dev;
 831         struct in_device *in_dev;
 832         int err;
 833
 834         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
 835                                      ifa_ipv4_policy, extack);
 836         if (err < 0)
 837                 goto errout;
 838
 839         ifm = nlmsg_data(nlh);
 840         err = -EINVAL;
 841         if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
 842                 goto errout;
 843
 844         dev = __dev_get_by_index(net, ifm->ifa_index);
 845         err = -ENODEV;
 846         if (!dev)
 847                 goto errout;
 848
 849         in_dev = __in_dev_get_rtnl(dev);
 850         err = -ENOBUFS;
 851         if (!in_dev)
 852                 goto errout;
 853
 854         ifa = inet_alloc_ifa();
 855         if (!ifa)
 856                 /*
 857                  * A potential indev allocation can be left alive, it stays
 858                  * assigned to its device and is destroy with it.
 859                  */
 860                 goto errout;
 861
 862         ipv4_devconf_setall(in_dev);
 863         neigh_parms_data_state_setall(in_dev->arp_parms);
 864         in_dev_hold(in_dev);
 865
 866         if (!tb[IFA_ADDRESS])
 867                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 868
 869         INIT_HLIST_NODE(&ifa->hash);
 870         ifa->ifa_prefixlen = ifm->ifa_prefixlen;
 871         ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
 872         ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
 873                                          ifm->ifa_flags;
 874         ifa->ifa_scope = ifm->ifa_scope;
 875         ifa->ifa_dev = in_dev;
 876
 877         ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
 878         ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
 879
 880         if (tb[IFA_BROADCAST])
 881                 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
 882
 883         if (tb[IFA_LABEL])
 884                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 885         else
 886                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 887
 888         if (tb[IFA_RT_PRIORITY])
 889                 ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
 890
 891         if (tb[IFA_CACHEINFO]) {
 892                 struct ifa_cacheinfo *ci;
 893
 894                 ci = nla_data(tb[IFA_CACHEINFO]);
 895                 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
 896                         err = -EINVAL;
 897                         goto errout_free;
 898                 }
 899                 *pvalid_lft = ci->ifa_valid;
 900                 *pprefered_lft = ci->ifa_prefered;
 901         }
 902
 903         return ifa;
 904
 905 errout_free:
 906         inet_free_ifa(ifa);
 907 errout:
 908         return ERR_PTR(err);
 909 }
 910
 911 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
 912 {
 913         struct in_device *in_dev = ifa->ifa_dev;
 914         struct in_ifaddr *ifa1;
 915
 916         if (!ifa->ifa_local)
 917                 return NULL;
 918
 919         in_dev_for_each_ifa_rtnl(ifa1, in_dev) {
 920                 if (ifa1->ifa_mask == ifa->ifa_mask &&
 921                     inet_ifa_match(ifa1->ifa_address, ifa) &&
 922                     ifa1->ifa_local == ifa->ifa_local)
 923                         return ifa1;
 924         }
 925         return NULL;
 926 }
 927
 928 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
 929                             struct netlink_ext_ack *extack)
 930 {
 931         struct net *net = sock_net(skb->sk);
 932         struct in_ifaddr *ifa;
 933         struct in_ifaddr *ifa_existing;
 934         __u32 valid_lft = INFINITY_LIFE_TIME;
 935         __u32 prefered_lft = INFINITY_LIFE_TIME;
 936
 937         ASSERT_RTNL();
 938
 939         ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack);
 940         if (IS_ERR(ifa))
 941                 return PTR_ERR(ifa);
 942
 943         ifa_existing = find_matching_ifa(ifa);
 944         if (!ifa_existing) {
 945                 /* It would be best to check for !NLM_F_CREATE here but
 946                  * userspace already relies on not having to provide this.
 947                  */
 948                 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
 949                 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
 950                         int ret = ip_mc_autojoin_config(net, true, ifa);
 951
 952                         if (ret < 0) {
 953                                 inet_free_ifa(ifa);
 954                                 return ret;
 955                         }
 956                 }
 957                 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
 958                                          extack);
 959         } else {
 960                 u32 new_metric = ifa->ifa_rt_priority;
 961
 962                 inet_free_ifa(ifa);
 963
 964                 if (nlh->nlmsg_flags & NLM_F_EXCL ||
 965                     !(nlh->nlmsg_flags & NLM_F_REPLACE))
 966                         return -EEXIST;
 967                 ifa = ifa_existing;
 968
 969                 if (ifa->ifa_rt_priority != new_metric) {
 970                         fib_modify_prefix_metric(ifa, new_metric);
 971                         ifa->ifa_rt_priority = new_metric;
 972                 }
 973
 974                 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
 975                 cancel_delayed_work(&check_lifetime_work);
 976                 queue_delayed_work(system_power_efficient_wq,
 977                                 &check_lifetime_work, 0);
 978                 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
 979         }
 980         return 0;
 981 }
 982
 983 /*
 984  *      Determine a default network mask, based on the IP address.
 985  */
 986
 987 static int inet_abc_len(__be32 addr)
 988 {
 989         int rc = -1;    /* Something else, probably a multicast. */
 990
 991         if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
 992                 rc = 0;
 993         else {
 994                 __u32 haddr = ntohl(addr);
 995                 if (IN_CLASSA(haddr))
 996                         rc = 8;
 997                 else if (IN_CLASSB(haddr))
 998                         rc = 16;
 999                 else if (IN_CLASSC(haddr))
1000                         rc = 24;
1001                 else if (IN_CLASSE(haddr))
1002                         rc = 32;
1003         }
1004
1005         return rc;
1006 }
1007
1008
1009 int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
1010 {
1011         struct sockaddr_in sin_orig;
1012         struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
1013         struct in_ifaddr __rcu **ifap = NULL;
1014         struct in_device *in_dev;
1015         struct in_ifaddr *ifa = NULL;
1016         struct net_device *dev;
1017         char *colon;
1018         int ret = -EFAULT;
1019         int tryaddrmatch = 0;
1020
1021         ifr->ifr_name[IFNAMSIZ - 1] = 0;
1022
1023         /* save original address for comparison */
1024         memcpy(&sin_orig, sin, sizeof(*sin));
1025
1026         colon = strchr(ifr->ifr_name, ':');
1027         if (colon)
1028                 *colon = 0;
1029
1030         dev_load(net, ifr->ifr_name);
1031
1032         switch (cmd) {
1033         case SIOCGIFADDR:       /* Get interface address */
1034         case SIOCGIFBRDADDR:    /* Get the broadcast address */
1035         case SIOCGIFDSTADDR:    /* Get the destination address */
1036         case SIOCGIFNETMASK:    /* Get the netmask for the interface */
1037                 /* Note that these ioctls will not sleep,
1038                    so that we do not impose a lock.
1039                    One day we will be forced to put shlock here (I mean SMP)
1040                  */
1041                 tryaddrmatch = (sin_orig.sin_family == AF_INET);
1042                 memset(sin, 0, sizeof(*sin));
1043                 sin->sin_family = AF_INET;
1044                 break;
1045
1046         case SIOCSIFFLAGS:
1047                 ret = -EPERM;
1048                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1049                         goto out;
1050                 break;
1051         case SIOCSIFADDR:       /* Set interface address (and family) */
1052         case SIOCSIFBRDADDR:    /* Set the broadcast address */
1053         case SIOCSIFDSTADDR:    /* Set the destination address */
1054         case SIOCSIFNETMASK:    /* Set the netmask for the interface */
1055                 ret = -EPERM;
1056                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1057                         goto out;
1058                 ret = -EINVAL;
1059                 if (sin->sin_family != AF_INET)
1060                         goto out;
1061                 break;
1062         default:
1063                 ret = -EINVAL;
1064                 goto out;
1065         }
1066
1067         rtnl_lock();
1068
1069         ret = -ENODEV;
1070         dev = __dev_get_by_name(net, ifr->ifr_name);
1071         if (!dev)
1072                 goto done;
1073
1074         if (colon)
1075                 *colon = ':';
1076
1077         in_dev = __in_dev_get_rtnl(dev);
1078         if (in_dev) {
1079                 if (tryaddrmatch) {
1080                         /* Matthias Andree */
1081                         /* compare label and address (4.4BSD style) */
1082                         /* note: we only do this for a limited set of ioctls
1083                            and only if the original address family was AF_INET.
1084                            This is checked above. */
1085
1086                         for (ifap = &in_dev->ifa_list;
1087                              (ifa = rtnl_dereference(*ifap)) != NULL;
1088                              ifap = &ifa->ifa_next) {
1089                                 if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1090                                     sin_orig.sin_addr.s_addr ==
1091                                                         ifa->ifa_local) {
1092                                         break; /* found */
1093                                 }
1094                         }
1095                 }
1096                 /* we didn't get a match, maybe the application is
1097                    4.3BSD-style and passed in junk so we fall back to
1098                    comparing just the label */
1099                 if (!ifa) {
1100                         for (ifap = &in_dev->ifa_list;
1101                              (ifa = rtnl_dereference(*ifap)) != NULL;
1102                              ifap = &ifa->ifa_next)
1103                                 if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1104                                         break;
1105                 }
1106         }
1107
1108         ret = -EADDRNOTAVAIL;
1109         if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1110                 goto done;
1111
1112         switch (cmd) {
1113         case SIOCGIFADDR:       /* Get interface address */
1114                 ret = 0;
1115                 sin->sin_addr.s_addr = ifa->ifa_local;
1116                 break;
1117
1118         case SIOCGIFBRDADDR:    /* Get the broadcast address */
1119                 ret = 0;
1120                 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1121                 break;
1122
1123         case SIOCGIFDSTADDR:    /* Get the destination address */
1124                 ret = 0;
1125                 sin->sin_addr.s_addr = ifa->ifa_address;
1126                 break;
1127
1128         case SIOCGIFNETMASK:    /* Get the netmask for the interface */
1129                 ret = 0;
1130                 sin->sin_addr.s_addr = ifa->ifa_mask;
1131                 break;
1132
1133         case SIOCSIFFLAGS:
1134                 if (colon) {
1135                         ret = -EADDRNOTAVAIL;
1136                         if (!ifa)
1137                                 break;
1138                         ret = 0;
1139                         if (!(ifr->ifr_flags & IFF_UP))
1140                                 inet_del_ifa(in_dev, ifap, 1);
1141                         break;
1142                 }
1143                 ret = dev_change_flags(dev, ifr->ifr_flags, NULL);
1144                 break;
1145
1146         case SIOCSIFADDR:       /* Set interface address (and family) */
1147                 ret = -EINVAL;
1148                 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1149                         break;
1150
1151                 if (!ifa) {
1152                         ret = -ENOBUFS;
1153                         ifa = inet_alloc_ifa();
1154                         if (!ifa)
1155                                 break;
1156                         INIT_HLIST_NODE(&ifa->hash);
1157                         if (colon)
1158                                 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1159                         else
1160                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1161                 } else {
1162                         ret = 0;
1163                         if (ifa->ifa_local == sin->sin_addr.s_addr)
1164                                 break;
1165                         inet_del_ifa(in_dev, ifap, 0);
1166                         ifa->ifa_broadcast = 0;
1167                         ifa->ifa_scope = 0;
1168                 }
1169
1170                 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1171
1172                 if (!(dev->flags & IFF_POINTOPOINT)) {
1173                         ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1174                         ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1175                         if ((dev->flags & IFF_BROADCAST) &&
1176                             ifa->ifa_prefixlen < 31)
1177                                 ifa->ifa_broadcast = ifa->ifa_address |
1178                                                      ~ifa->ifa_mask;
1179                 } else {
1180                         ifa->ifa_prefixlen = 32;
1181                         ifa->ifa_mask = inet_make_mask(32);
1182                 }
1183                 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1184                 ret = inet_set_ifa(dev, ifa);
1185                 break;
1186
1187         case SIOCSIFBRDADDR:    /* Set the broadcast address */
1188                 ret = 0;
1189                 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1190                         inet_del_ifa(in_dev, ifap, 0);
1191                         ifa->ifa_broadcast = sin->sin_addr.s_addr;
1192                         inet_insert_ifa(ifa);
1193                 }
1194                 break;
1195
1196         case SIOCSIFDSTADDR:    /* Set the destination address */
1197                 ret = 0;
1198                 if (ifa->ifa_address == sin->sin_addr.s_addr)
1199                         break;
1200                 ret = -EINVAL;
1201                 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1202                         break;
1203                 ret = 0;
1204                 inet_del_ifa(in_dev, ifap, 0);
1205                 ifa->ifa_address = sin->sin_addr.s_addr;
1206                 inet_insert_ifa(ifa);
1207                 break;
1208
1209         case SIOCSIFNETMASK:    /* Set the netmask for the interface */
1210
1211                 /*
1212                  *      The mask we set must be legal.
1213                  */
1214                 ret = -EINVAL;
1215                 if (bad_mask(sin->sin_addr.s_addr, 0))
1216                         break;
1217                 ret = 0;
1218                 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1219                         __be32 old_mask = ifa->ifa_mask;
1220                         inet_del_ifa(in_dev, ifap, 0);
1221                         ifa->ifa_mask = sin->sin_addr.s_addr;
1222                         ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1223
1224                         /* See if current broadcast address matches
1225                          * with current netmask, then recalculate
1226                          * the broadcast address. Otherwise it's a
1227                          * funny address, so don't touch it since
1228                          * the user seems to know what (s)he's doing...
1229                          */
1230                         if ((dev->flags & IFF_BROADCAST) &&
1231                             (ifa->ifa_prefixlen < 31) &&
1232                             (ifa->ifa_broadcast ==
1233                              (ifa->ifa_local|~old_mask))) {
1234                                 ifa->ifa_broadcast = (ifa->ifa_local |
1235                                                       ~sin->sin_addr.s_addr);
1236                         }
1237                         inet_insert_ifa(ifa);
1238                 }
1239                 break;
1240         }
1241 done:
1242         rtnl_unlock();
1243 out:
1244         return ret;
1245 }
1246
1247 int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1248 {
1249         struct in_device *in_dev = __in_dev_get_rtnl(dev);
1250         const struct in_ifaddr *ifa;
1251         struct ifreq ifr;
1252         int done = 0;
1253
1254         if (WARN_ON(size > sizeof(struct ifreq)))
1255                 goto out;
1256
1257         if (!in_dev)
1258                 goto out;
1259
1260         in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1261                 if (!buf) {
1262                         done += size;
1263                         continue;
1264                 }
1265                 if (len < size)
1266                         break;
1267                 memset(&ifr, 0, sizeof(struct ifreq));
1268                 strcpy(ifr.ifr_name, ifa->ifa_label);
1269
1270                 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1271                 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1272                                                                 ifa->ifa_local;
1273
1274                 if (copy_to_user(buf + done, &ifr, size)) {
1275                         done = -EFAULT;
1276                         break;
1277                 }
1278                 len  -= size;
1279                 done += size;
1280         }
1281 out:
1282         return done;
1283 }
1284
1285 static __be32 in_dev_select_addr(const struct in_device *in_dev,
1286                                  int scope)
1287 {
1288         const struct in_ifaddr *ifa;
1289
1290         in_dev_for_each_ifa_rcu(ifa, in_dev) {
1291                 if (ifa->ifa_flags & IFA_F_SECONDARY)
1292                         continue;
1293                 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1294                     ifa->ifa_scope <= scope)
1295                         return ifa->ifa_local;
1296         }
1297
1298         return 0;
1299 }
1300
1301 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1302 {
1303         const struct in_ifaddr *ifa;
1304         __be32 addr = 0;
1305         unsigned char localnet_scope = RT_SCOPE_HOST;
1306         struct in_device *in_dev;
1307         struct net *net = dev_net(dev);
1308         int master_idx;
1309
1310         rcu_read_lock();
1311         in_dev = __in_dev_get_rcu(dev);
1312         if (!in_dev)
1313                 goto no_in_dev;
1314
1315         if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1316                 localnet_scope = RT_SCOPE_LINK;
1317
1318         in_dev_for_each_ifa_rcu(ifa, in_dev) {
1319                 if (ifa->ifa_flags & IFA_F_SECONDARY)
1320                         continue;
1321                 if (min(ifa->ifa_scope, localnet_scope) > scope)
1322                         continue;
1323                 if (!dst || inet_ifa_match(dst, ifa)) {
1324                         addr = ifa->ifa_local;
1325                         break;
1326                 }
1327                 if (!addr)
1328                         addr = ifa->ifa_local;
1329         }
1330
1331         if (addr)
1332                 goto out_unlock;
1333 no_in_dev:
1334         master_idx = l3mdev_master_ifindex_rcu(dev);
1335
1336         /* For VRFs, the VRF device takes the place of the loopback device,
1337          * with addresses on it being preferred.  Note in such cases the
1338          * loopback device will be among the devices that fail the master_idx
1339          * equality check in the loop below.
1340          */
1341         if (master_idx &&
1342             (dev = dev_get_by_index_rcu(net, master_idx)) &&
1343             (in_dev = __in_dev_get_rcu(dev))) {
1344                 addr = in_dev_select_addr(in_dev, scope);
1345                 if (addr)
1346                         goto out_unlock;
1347         }
1348
1349         /* Not loopback addresses on loopback should be preferred
1350            in this case. It is important that lo is the first interface
1351            in dev_base list.
1352          */
1353         for_each_netdev_rcu(net, dev) {
1354                 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1355                         continue;
1356
1357                 in_dev = __in_dev_get_rcu(dev);
1358                 if (!in_dev)
1359                         continue;
1360
1361                 addr = in_dev_select_addr(in_dev, scope);
1362                 if (addr)
1363                         goto out_unlock;
1364         }
1365 out_unlock:
1366         rcu_read_unlock();
1367         return addr;
1368 }
1369 EXPORT_SYMBOL(inet_select_addr);
1370
1371 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1372                               __be32 local, int scope)
1373 {
1374         unsigned char localnet_scope = RT_SCOPE_HOST;
1375         const struct in_ifaddr *ifa;
1376         __be32 addr = 0;
1377         int same = 0;
1378
1379         if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1380                 localnet_scope = RT_SCOPE_LINK;
1381
1382         in_dev_for_each_ifa_rcu(ifa, in_dev) {
1383                 unsigned char min_scope = min(ifa->ifa_scope, localnet_scope);
1384
1385                 if (!addr &&
1386                     (local == ifa->ifa_local || !local) &&
1387                     min_scope <= scope) {
1388                         addr = ifa->ifa_local;
1389                         if (same)
1390                                 break;
1391                 }
1392                 if (!same) {
1393                         same = (!local || inet_ifa_match(local, ifa)) &&
1394                                 (!dst || inet_ifa_match(dst, ifa));
1395                         if (same && addr) {
1396                                 if (local || !dst)
1397                                         break;
1398                                 /* Is the selected addr into dst subnet? */
1399                                 if (inet_ifa_match(addr, ifa))
1400                                         break;
1401                                 /* No, then can we use new local src? */
1402                                 if (min_scope <= scope) {
1403                                         addr = ifa->ifa_local;
1404                                         break;
1405                                 }
1406                                 /* search for large dst subnet for addr */
1407                                 same = 0;
1408                         }
1409                 }
1410         }
1411
1412         return same ? addr : 0;
1413 }
1414
1415 /*
1416  * Confirm that local IP address exists using wildcards:
1417  * - net: netns to check, cannot be NULL
1418  * - in_dev: only on this interface, NULL=any interface
1419  * - dst: only in the same subnet as dst, 0=any dst
1420  * - local: address, 0=autoselect the local address
1421  * - scope: maximum allowed scope value for the local address
1422  */
1423 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1424                          __be32 dst, __be32 local, int scope)
1425 {
1426         __be32 addr = 0;
1427         struct net_device *dev;
1428
1429         if (in_dev)
1430                 return confirm_addr_indev(in_dev, dst, local, scope);
1431
1432         rcu_read_lock();
1433         for_each_netdev_rcu(net, dev) {
1434                 in_dev = __in_dev_get_rcu(dev);
1435                 if (in_dev) {
1436                         addr = confirm_addr_indev(in_dev, dst, local, scope);
1437                         if (addr)
1438                                 break;
1439                 }
1440         }
1441         rcu_read_unlock();
1442
1443         return addr;
1444 }
1445 EXPORT_SYMBOL(inet_confirm_addr);
1446
1447 /*
1448  *      Device notifier
1449  */
1450
1451 int register_inetaddr_notifier(struct notifier_block *nb)
1452 {
1453         return blocking_notifier_chain_register(&inetaddr_chain, nb);
1454 }
1455 EXPORT_SYMBOL(register_inetaddr_notifier);
1456
1457 int unregister_inetaddr_notifier(struct notifier_block *nb)
1458 {
1459         return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1460 }
1461 EXPORT_SYMBOL(unregister_inetaddr_notifier);
1462
1463 int register_inetaddr_validator_notifier(struct notifier_block *nb)
1464 {
1465         return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1466 }
1467 EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1468
1469 int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1470 {
1471         return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1472             nb);
1473 }
1474 EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1475
1476 /* Rename ifa_labels for a device name change. Make some effort to preserve
1477  * existing alias numbering and to create unique labels if possible.
1478 */
1479 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1480 {
1481         struct in_ifaddr *ifa;
1482         int named = 0;
1483
1484         in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1485                 char old[IFNAMSIZ], *dot;
1486
1487                 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1488                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1489                 if (named++ == 0)
1490                         goto skip;
1491                 dot = strchr(old, ':');
1492                 if (!dot) {
1493                         sprintf(old, ":%d", named);
1494                         dot = old;
1495                 }
1496                 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1497                         strcat(ifa->ifa_label, dot);
1498                 else
1499                         strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1500 skip:
1501                 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1502         }
1503 }
1504
1505 static void inetdev_send_gratuitous_arp(struct net_device *dev,
1506                                         struct in_device *in_dev)
1507
1508 {
1509         const struct in_ifaddr *ifa;
1510
1511         in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1512                 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1513                          ifa->ifa_local, dev,
1514                          ifa->ifa_local, NULL,
1515                          dev->dev_addr, NULL);
1516         }
1517 }
1518
1519 /* Called only under RTNL semaphore */
1520
1521 static int inetdev_event(struct notifier_block *this, unsigned long event,
1522                          void *ptr)
1523 {
1524         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1525         struct in_device *in_dev = __in_dev_get_rtnl(dev);
1526
1527         ASSERT_RTNL();
1528
1529         if (!in_dev) {
1530                 if (event == NETDEV_REGISTER) {
1531                         in_dev = inetdev_init(dev);
1532                         if (IS_ERR(in_dev))
1533                                 return notifier_from_errno(PTR_ERR(in_dev));
1534                         if (dev->flags & IFF_LOOPBACK) {
1535                                 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1536                                 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1537                         }
1538                 } else if (event == NETDEV_CHANGEMTU) {
1539                         /* Re-enabling IP */
1540                         if (inetdev_valid_mtu(dev->mtu))
1541                                 in_dev = inetdev_init(dev);
1542                 }
1543                 goto out;
1544         }
1545
1546         switch (event) {
1547         case NETDEV_REGISTER:
1548                 pr_debug("%s: bug\n", __func__);
1549                 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1550                 break;
1551         case NETDEV_UP:
1552                 if (!inetdev_valid_mtu(dev->mtu))
1553                         break;
1554                 if (dev->flags & IFF_LOOPBACK) {
1555                         struct in_ifaddr *ifa = inet_alloc_ifa();
1556
1557                         if (ifa) {
1558                                 INIT_HLIST_NODE(&ifa->hash);
1559                                 ifa->ifa_local =
1560                                   ifa->ifa_address = htonl(INADDR_LOOPBACK);
1561                                 ifa->ifa_prefixlen = 8;
1562                                 ifa->ifa_mask = inet_make_mask(8);
1563                                 in_dev_hold(in_dev);
1564                                 ifa->ifa_dev = in_dev;
1565                                 ifa->ifa_scope = RT_SCOPE_HOST;
1566                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1567                                 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1568                                                  INFINITY_LIFE_TIME);
1569                                 ipv4_devconf_setall(in_dev);
1570                                 neigh_parms_data_state_setall(in_dev->arp_parms);
1571                                 inet_insert_ifa(ifa);
1572                         }
1573                 }
1574                 ip_mc_up(in_dev);
1575                 fallthrough;
1576         case NETDEV_CHANGEADDR:
1577                 if (!IN_DEV_ARP_NOTIFY(in_dev))
1578                         break;
1579                 fallthrough;
1580         case NETDEV_NOTIFY_PEERS:
1581                 /* Send gratuitous ARP to notify of link change */
1582                 inetdev_send_gratuitous_arp(dev, in_dev);
1583                 break;
1584         case NETDEV_DOWN:
1585                 ip_mc_down(in_dev);
1586                 break;
1587         case NETDEV_PRE_TYPE_CHANGE:
1588                 ip_mc_unmap(in_dev);
1589                 break;
1590         case NETDEV_POST_TYPE_CHANGE:
1591                 ip_mc_remap(in_dev);
1592                 break;
1593         case NETDEV_CHANGEMTU:
1594                 if (inetdev_valid_mtu(dev->mtu))
1595                         break;
1596                 /* disable IP when MTU is not enough */
1597                 fallthrough;
1598         case NETDEV_UNREGISTER:
1599                 inetdev_destroy(in_dev);
1600                 break;
1601         case NETDEV_CHANGENAME:
1602                 /* Do not notify about label change, this event is
1603                  * not interesting to applications using netlink.
1604                  */
1605                 inetdev_changename(dev, in_dev);
1606
1607                 devinet_sysctl_unregister(in_dev);
1608                 devinet_sysctl_register(in_dev);
1609                 break;
1610         }
1611 out:
1612         return NOTIFY_DONE;
1613 }
1614
1615 static struct notifier_block ip_netdev_notifier = {
1616         .notifier_call = inetdev_event,
1617 };
1618
1619 static size_t inet_nlmsg_size(void)
1620 {
1621         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1622                + nla_total_size(4) /* IFA_ADDRESS */
1623                + nla_total_size(4) /* IFA_LOCAL */
1624                + nla_total_size(4) /* IFA_BROADCAST */
1625                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1626                + nla_total_size(4)  /* IFA_FLAGS */
1627                + nla_total_size(4)  /* IFA_RT_PRIORITY */
1628                + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1629 }
1630
1631 static inline u32 cstamp_delta(unsigned long cstamp)
1632 {
1633         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1634 }
1635
1636 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1637                          unsigned long tstamp, u32 preferred, u32 valid)
1638 {
1639         struct ifa_cacheinfo ci;
1640
1641         ci.cstamp = cstamp_delta(cstamp);
1642         ci.tstamp = cstamp_delta(tstamp);
1643         ci.ifa_prefered = preferred;
1644         ci.ifa_valid = valid;
1645
1646         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1647 }
1648
1649 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1650                             struct inet_fill_args *args)
1651 {
1652         struct ifaddrmsg *ifm;
1653         struct nlmsghdr  *nlh;
1654         u32 preferred, valid;
1655
1656         nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm),
1657                         args->flags);
1658         if (!nlh)
1659                 return -EMSGSIZE;
1660
1661         ifm = nlmsg_data(nlh);
1662         ifm->ifa_family = AF_INET;
1663         ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1664         ifm->ifa_flags = ifa->ifa_flags;
1665         ifm->ifa_scope = ifa->ifa_scope;
1666         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1667
1668         if (args->netnsid >= 0 &&
1669             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
1670                 goto nla_put_failure;
1671
1672         if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1673                 preferred = ifa->ifa_preferred_lft;
1674                 valid = ifa->ifa_valid_lft;
1675                 if (preferred != INFINITY_LIFE_TIME) {
1676                         long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1677
1678                         if (preferred > tval)
1679                                 preferred -= tval;
1680                         else
1681                                 preferred = 0;
1682                         if (valid != INFINITY_LIFE_TIME) {
1683                                 if (valid > tval)
1684                                         valid -= tval;
1685                                 else
1686                                         valid = 0;
1687                         }
1688                 }
1689         } else {
1690                 preferred = INFINITY_LIFE_TIME;
1691                 valid = INFINITY_LIFE_TIME;
1692         }
1693         if ((ifa->ifa_address &&
1694              nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1695             (ifa->ifa_local &&
1696              nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1697             (ifa->ifa_broadcast &&
1698              nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1699             (ifa->ifa_label[0] &&
1700              nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1701             nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1702             (ifa->ifa_rt_priority &&
1703              nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
1704             put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1705                           preferred, valid))
1706                 goto nla_put_failure;
1707
1708         nlmsg_end(skb, nlh);
1709         return 0;
1710
1711 nla_put_failure:
1712         nlmsg_cancel(skb, nlh);
1713         return -EMSGSIZE;
1714 }
1715
1716 static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
1717                                       struct inet_fill_args *fillargs,
1718                                       struct net **tgt_net, struct sock *sk,
1719                                       struct netlink_callback *cb)
1720 {
1721         struct netlink_ext_ack *extack = cb->extack;
1722         struct nlattr *tb[IFA_MAX+1];
1723         struct ifaddrmsg *ifm;
1724         int err, i;
1725
1726         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1727                 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request");
1728                 return -EINVAL;
1729         }
1730
1731         ifm = nlmsg_data(nlh);
1732         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
1733                 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request");
1734                 return -EINVAL;
1735         }
1736
1737         fillargs->ifindex = ifm->ifa_index;
1738         if (fillargs->ifindex) {
1739                 cb->answer_flags |= NLM_F_DUMP_FILTERED;
1740                 fillargs->flags |= NLM_F_DUMP_FILTERED;
1741         }
1742
1743         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
1744                                             ifa_ipv4_policy, extack);
1745         if (err < 0)
1746                 return err;
1747
1748         for (i = 0; i <= IFA_MAX; ++i) {
1749                 if (!tb[i])
1750                         continue;
1751
1752                 if (i == IFA_TARGET_NETNSID) {
1753                         struct net *net;
1754
1755                         fillargs->netnsid = nla_get_s32(tb[i]);
1756
1757                         net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
1758                         if (IS_ERR(net)) {
1759                                 fillargs->netnsid = -1;
1760                                 NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id");
1761                                 return PTR_ERR(net);
1762                         }
1763                         *tgt_net = net;
1764                 } else {
1765                         NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request");
1766                         return -EINVAL;
1767                 }
1768         }
1769
1770         return 0;
1771 }
1772
1773 static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,
1774                             struct netlink_callback *cb, int s_ip_idx,
1775                             struct inet_fill_args *fillargs)
1776 {
1777         struct in_ifaddr *ifa;
1778         int ip_idx = 0;
1779         int err;
1780
1781         in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1782                 if (ip_idx < s_ip_idx) {
1783                         ip_idx++;
1784                         continue;
1785                 }
1786                 err = inet_fill_ifaddr(skb, ifa, fillargs);
1787                 if (err < 0)
1788                         goto done;
1789
1790                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1791                 ip_idx++;
1792         }
1793         err = 0;
1794
1795 done:
1796         cb->args[2] = ip_idx;
1797
1798         return err;
1799 }
1800
1801 /* Combine dev_addr_genid and dev_base_seq to detect changes.
1802  */
1803 static u32 inet_base_seq(const struct net *net)
1804 {
1805         u32 res = atomic_read(&net->ipv4.dev_addr_genid) +
1806                   net->dev_base_seq;
1807
1808         /* Must not return 0 (see nl_dump_check_consistent()).
1809          * Chose a value far away from 0.
1810          */
1811         if (!res)
1812                 res = 0x80000000;
1813         return res;
1814 }
1815
1816 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1817 {
1818         const struct nlmsghdr *nlh = cb->nlh;
1819         struct inet_fill_args fillargs = {
1820                 .portid = NETLINK_CB(cb->skb).portid,
1821                 .seq = nlh->nlmsg_seq,
1822                 .event = RTM_NEWADDR,
1823                 .flags = NLM_F_MULTI,
1824                 .netnsid = -1,
1825         };
1826         struct net *net = sock_net(skb->sk);
1827         struct net *tgt_net = net;
1828         int h, s_h;
1829         int idx, s_idx;
1830         int s_ip_idx;
1831         struct net_device *dev;
1832         struct in_device *in_dev;
1833         struct hlist_head *head;
1834         int err = 0;
1835
1836         s_h = cb->args[0];
1837         s_idx = idx = cb->args[1];
1838         s_ip_idx = cb->args[2];
1839
1840         if (cb->strict_check) {
1841                 err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
1842                                                  skb->sk, cb);
1843                 if (err < 0)
1844                         goto put_tgt_net;
1845
1846                 err = 0;
1847                 if (fillargs.ifindex) {
1848                         dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
1849                         if (!dev) {
1850                                 err = -ENODEV;
1851                                 goto put_tgt_net;
1852                         }
1853
1854                         in_dev = __in_dev_get_rtnl(dev);
1855                         if (in_dev) {
1856                                 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1857                                                        &fillargs);
1858                         }
1859                         goto put_tgt_net;
1860                 }
1861         }
1862
1863         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1864                 idx = 0;
1865                 head = &tgt_net->dev_index_head[h];
1866                 rcu_read_lock();
1867                 cb->seq = inet_base_seq(tgt_net);
1868                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1869                         if (idx < s_idx)
1870                                 goto cont;
1871                         if (h > s_h || idx > s_idx)
1872                                 s_ip_idx = 0;
1873                         in_dev = __in_dev_get_rcu(dev);
1874                         if (!in_dev)
1875                                 goto cont;
1876
1877                         err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1878                                                &fillargs);
1879                         if (err < 0) {
1880                                 rcu_read_unlock();
1881                                 goto done;
1882                         }
1883 cont:
1884                         idx++;
1885                 }
1886                 rcu_read_unlock();
1887         }
1888
1889 done:
1890         cb->args[0] = h;
1891         cb->args[1] = idx;
1892 put_tgt_net:
1893         if (fillargs.netnsid >= 0)
1894                 put_net(tgt_net);
1895
1896         return skb->len ? : err;
1897 }
1898
1899 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1900                       u32 portid)
1901 {
1902         struct inet_fill_args fillargs = {
1903                 .portid = portid,
1904                 .seq = nlh ? nlh->nlmsg_seq : 0,
1905                 .event = event,
1906                 .flags = 0,
1907                 .netnsid = -1,
1908         };
1909         struct sk_buff *skb;
1910         int err = -ENOBUFS;
1911         struct net *net;
1912
1913         net = dev_net(ifa->ifa_dev->dev);
1914         skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1915         if (!skb)
1916                 goto errout;
1917
1918         err = inet_fill_ifaddr(skb, ifa, &fillargs);
1919         if (err < 0) {
1920                 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1921                 WARN_ON(err == -EMSGSIZE);
1922                 kfree_skb(skb);
1923                 goto errout;
1924         }
1925         rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1926         return;
1927 errout:
1928         if (err < 0)
1929                 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1930 }
1931
1932 static size_t inet_get_link_af_size(const struct net_device *dev,
1933                                     u32 ext_filter_mask)
1934 {
1935         struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1936
1937         if (!in_dev)
1938                 return 0;
1939
1940         return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1941 }
1942
1943 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1944                              u32 ext_filter_mask)
1945 {
1946         struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1947         struct nlattr *nla;
1948         int i;
1949
1950         if (!in_dev)
1951                 return -ENODATA;
1952
1953         nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1954         if (!nla)
1955                 return -EMSGSIZE;
1956
1957         for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1958                 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1959
1960         return 0;
1961 }
1962
1963 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1964         [IFLA_INET_CONF]        = { .type = NLA_NESTED },
1965 };
1966
1967 static int inet_validate_link_af(const struct net_device *dev,
1968                                  const struct nlattr *nla)
1969 {
1970         struct nlattr *a, *tb[IFLA_INET_MAX+1];
1971         int err, rem;
1972
1973         if (dev && !__in_dev_get_rcu(dev))
1974                 return -EAFNOSUPPORT;
1975
1976         err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla,
1977                                           inet_af_policy, NULL);
1978         if (err < 0)
1979                 return err;
1980
1981         if (tb[IFLA_INET_CONF]) {
1982                 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1983                         int cfgid = nla_type(a);
1984
1985                         if (nla_len(a) < 4)
1986                                 return -EINVAL;
1987
1988                         if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1989                                 return -EINVAL;
1990                 }
1991         }
1992
1993         return 0;
1994 }
1995
1996 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1997 {
1998         struct in_device *in_dev = __in_dev_get_rcu(dev);
1999         struct nlattr *a, *tb[IFLA_INET_MAX+1];
2000         int rem;
2001
2002         if (!in_dev)
2003                 return -EAFNOSUPPORT;
2004
2005         if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
2006                 return -EINVAL;
2007
2008         if (tb[IFLA_INET_CONF]) {
2009                 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
2010                         ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
2011         }
2012
2013         return 0;
2014 }
2015
2016 static int inet_netconf_msgsize_devconf(int type)
2017 {
2018         int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
2019                    + nla_total_size(4); /* NETCONFA_IFINDEX */
2020         bool all = false;
2021
2022         if (type == NETCONFA_ALL)
2023                 all = true;
2024
2025         if (all || type == NETCONFA_FORWARDING)
2026                 size += nla_total_size(4);
2027         if (all || type == NETCONFA_RP_FILTER)
2028                 size += nla_total_size(4);
2029         if (all || type == NETCONFA_MC_FORWARDING)
2030                 size += nla_total_size(4);
2031         if (all || type == NETCONFA_BC_FORWARDING)
2032                 size += nla_total_size(4);
2033         if (all || type == NETCONFA_PROXY_NEIGH)
2034                 size += nla_total_size(4);
2035         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
2036                 size += nla_total_size(4);
2037
2038         return size;
2039 }
2040
2041 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
2042                                      struct ipv4_devconf *devconf, u32 portid,
2043                                      u32 seq, int event, unsigned int flags,
2044                                      int type)
2045 {
2046         struct nlmsghdr  *nlh;
2047         struct netconfmsg *ncm;
2048         bool all = false;
2049
2050         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
2051                         flags);
2052         if (!nlh)
2053                 return -EMSGSIZE;
2054
2055         if (type == NETCONFA_ALL)
2056                 all = true;
2057
2058         ncm = nlmsg_data(nlh);
2059         ncm->ncm_family = AF_INET;
2060
2061         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
2062                 goto nla_put_failure;
2063
2064         if (!devconf)
2065                 goto out;
2066
2067         if ((all || type == NETCONFA_FORWARDING) &&
2068             nla_put_s32(skb, NETCONFA_FORWARDING,
2069                         IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
2070                 goto nla_put_failure;
2071         if ((all || type == NETCONFA_RP_FILTER) &&
2072             nla_put_s32(skb, NETCONFA_RP_FILTER,
2073                         IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
2074                 goto nla_put_failure;
2075         if ((all || type == NETCONFA_MC_FORWARDING) &&
2076             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
2077                         IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
2078                 goto nla_put_failure;
2079         if ((all || type == NETCONFA_BC_FORWARDING) &&
2080             nla_put_s32(skb, NETCONFA_BC_FORWARDING,
2081                         IPV4_DEVCONF(*devconf, BC_FORWARDING)) < 0)
2082                 goto nla_put_failure;
2083         if ((all || type == NETCONFA_PROXY_NEIGH) &&
2084             nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
2085                         IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
2086                 goto nla_put_failure;
2087         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
2088             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2089                         IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
2090                 goto nla_put_failure;
2091
2092 out:
2093         nlmsg_end(skb, nlh);
2094         return 0;
2095
2096 nla_put_failure:
2097         nlmsg_cancel(skb, nlh);
2098         return -EMSGSIZE;
2099 }
2100
2101 void inet_netconf_notify_devconf(struct net *net, int event, int type,
2102                                  int ifindex, struct ipv4_devconf *devconf)
2103 {
2104         struct sk_buff *skb;
2105         int err = -ENOBUFS;
2106
2107         skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
2108         if (!skb)
2109                 goto errout;
2110
2111         err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
2112                                         event, 0, type);
2113         if (err < 0) {
2114                 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2115                 WARN_ON(err == -EMSGSIZE);
2116                 kfree_skb(skb);
2117                 goto errout;
2118         }
2119         rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
2120         return;
2121 errout:
2122         if (err < 0)
2123                 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
2124 }
2125
2126 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
2127         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
2128         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
2129         [NETCONFA_RP_FILTER]    = { .len = sizeof(int) },
2130         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
2131         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
2132 };
2133
2134 static int inet_netconf_valid_get_req(struct sk_buff *skb,
2135                                       const struct nlmsghdr *nlh,
2136                                       struct nlattr **tb,
2137                                       struct netlink_ext_ack *extack)
2138 {
2139         int i, err;
2140
2141         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
2142                 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request");
2143                 return -EINVAL;
2144         }
2145
2146         if (!netlink_strict_get_check(skb))
2147                 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
2148                                               tb, NETCONFA_MAX,
2149                                               devconf_ipv4_policy, extack);
2150
2151         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
2152                                             tb, NETCONFA_MAX,
2153                                             devconf_ipv4_policy, extack);
2154         if (err)
2155                 return err;
2156
2157         for (i = 0; i <= NETCONFA_MAX; i++) {
2158                 if (!tb[i])
2159                         continue;
2160
2161                 switch (i) {
2162                 case NETCONFA_IFINDEX:
2163                         break;
2164                 default:
2165                         NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request");
2166                         return -EINVAL;
2167                 }
2168         }
2169
2170         return 0;
2171 }
2172
2173 static int inet_netconf_get_devconf(struct sk_buff *in_skb,
2174                                     struct nlmsghdr *nlh,
2175                                     struct netlink_ext_ack *extack)
2176 {
2177         struct net *net = sock_net(in_skb->sk);
2178         struct nlattr *tb[NETCONFA_MAX+1];
2179         struct sk_buff *skb;
2180         struct ipv4_devconf *devconf;
2181         struct in_device *in_dev;
2182         struct net_device *dev;
2183         int ifindex;
2184         int err;
2185
2186         err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack);
2187         if (err)
2188                 goto errout;
2189
2190         err = -EINVAL;
2191         if (!tb[NETCONFA_IFINDEX])
2192                 goto errout;
2193
2194         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
2195         switch (ifindex) {
2196         case NETCONFA_IFINDEX_ALL:
2197                 devconf = net->ipv4.devconf_all;
2198                 break;
2199         case NETCONFA_IFINDEX_DEFAULT:
2200                 devconf = net->ipv4.devconf_dflt;
2201                 break;
2202         default:
2203                 dev = __dev_get_by_index(net, ifindex);
2204                 if (!dev)
2205                         goto errout;
2206                 in_dev = __in_dev_get_rtnl(dev);
2207                 if (!in_dev)
2208                         goto errout;
2209                 devconf = &in_dev->cnf;
2210                 break;
2211         }
2212
2213         err = -ENOBUFS;
2214         skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
2215         if (!skb)
2216                 goto errout;
2217
2218         err = inet_netconf_fill_devconf(skb, ifindex, devconf,
2219                                         NETLINK_CB(in_skb).portid,
2220                                         nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
2221                                         NETCONFA_ALL);
2222         if (err < 0) {
2223                 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2224                 WARN_ON(err == -EMSGSIZE);
2225                 kfree_skb(skb);
2226                 goto errout;
2227         }
2228         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2229 errout:
2230         return err;
2231 }
2232
2233 static int inet_netconf_dump_devconf(struct sk_buff *skb,
2234                                      struct netlink_callback *cb)
2235 {
2236         const struct nlmsghdr *nlh = cb->nlh;
2237         struct net *net = sock_net(skb->sk);
2238         int h, s_h;
2239         int idx, s_idx;
2240         struct net_device *dev;
2241         struct in_device *in_dev;
2242         struct hlist_head *head;
2243
2244         if (cb->strict_check) {
2245                 struct netlink_ext_ack *extack = cb->extack;
2246                 struct netconfmsg *ncm;
2247
2248                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
2249                         NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request");
2250                         return -EINVAL;
2251                 }
2252
2253                 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
2254                         NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request");
2255                         return -EINVAL;
2256                 }
2257         }
2258
2259         s_h = cb->args[0];
2260         s_idx = idx = cb->args[1];
2261
2262         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2263                 idx = 0;
2264                 head = &net->dev_index_head[h];
2265                 rcu_read_lock();
2266                 cb->seq = inet_base_seq(net);
2267                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
2268                         if (idx < s_idx)
2269                                 goto cont;
2270                         in_dev = __in_dev_get_rcu(dev);
2271                         if (!in_dev)
2272                                 goto cont;
2273
2274                         if (inet_netconf_fill_devconf(skb, dev->ifindex,
2275                                                       &in_dev->cnf,
2276                                                       NETLINK_CB(cb->skb).portid,
2277                                                       nlh->nlmsg_seq,
2278                                                       RTM_NEWNETCONF,
2279                                                       NLM_F_MULTI,
2280                                                       NETCONFA_ALL) < 0) {
2281                                 rcu_read_unlock();
2282                                 goto done;
2283                         }
2284                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2285 cont:
2286                         idx++;
2287                 }
2288                 rcu_read_unlock();
2289         }
2290         if (h == NETDEV_HASHENTRIES) {
2291                 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2292                                               net->ipv4.devconf_all,
2293                                               NETLINK_CB(cb->skb).portid,
2294                                               nlh->nlmsg_seq,
2295                                               RTM_NEWNETCONF, NLM_F_MULTI,
2296                                               NETCONFA_ALL) < 0)
2297                         goto done;
2298                 else
2299                         h++;
2300         }
2301         if (h == NETDEV_HASHENTRIES + 1) {
2302                 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2303                                               net->ipv4.devconf_dflt,
2304                                               NETLINK_CB(cb->skb).portid,
2305                                               nlh->nlmsg_seq,
2306                                               RTM_NEWNETCONF, NLM_F_MULTI,
2307                                               NETCONFA_ALL) < 0)
2308                         goto done;
2309                 else
2310                         h++;
2311         }
2312 done:
2313         cb->args[0] = h;
2314         cb->args[1] = idx;
2315
2316         return skb->len;
2317 }
2318
2319 #ifdef CONFIG_SYSCTL
2320
2321 static void devinet_copy_dflt_conf(struct net *net, int i)
2322 {
2323         struct net_device *dev;
2324
2325         rcu_read_lock();
2326         for_each_netdev_rcu(net, dev) {
2327                 struct in_device *in_dev;
2328
2329                 in_dev = __in_dev_get_rcu(dev);
2330                 if (in_dev && !test_bit(i, in_dev->cnf.state))
2331                         in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2332         }
2333         rcu_read_unlock();
2334 }
2335
2336 /* called with RTNL locked */
2337 static void inet_forward_change(struct net *net)
2338 {
2339         struct net_device *dev;
2340         int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2341
2342         IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2343         IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2344         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2345                                     NETCONFA_FORWARDING,
2346                                     NETCONFA_IFINDEX_ALL,
2347                                     net->ipv4.devconf_all);
2348         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2349                                     NETCONFA_FORWARDING,
2350                                     NETCONFA_IFINDEX_DEFAULT,
2351                                     net->ipv4.devconf_dflt);
2352
2353         for_each_netdev(net, dev) {
2354                 struct in_device *in_dev;
2355
2356                 if (on)
2357                         dev_disable_lro(dev);
2358
2359                 in_dev = __in_dev_get_rtnl(dev);
2360                 if (in_dev) {
2361                         IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2362                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2363                                                     NETCONFA_FORWARDING,
2364                                                     dev->ifindex, &in_dev->cnf);
2365                 }
2366         }
2367 }
2368
2369 static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2370 {
2371         if (cnf == net->ipv4.devconf_dflt)
2372                 return NETCONFA_IFINDEX_DEFAULT;
2373         else if (cnf == net->ipv4.devconf_all)
2374                 return NETCONFA_IFINDEX_ALL;
2375         else {
2376                 struct in_device *idev
2377                         = container_of(cnf, struct in_device, cnf);
2378                 return idev->dev->ifindex;
2379         }
2380 }
2381
2382 static int devinet_conf_proc(struct ctl_table *ctl, int write,
2383                              void *buffer, size_t *lenp, loff_t *ppos)
2384 {
2385         int old_value = *(int *)ctl->data;
2386         int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2387         int new_value = *(int *)ctl->data;
2388
2389         if (write) {
2390                 struct ipv4_devconf *cnf = ctl->extra1;
2391                 struct net *net = ctl->extra2;
2392                 int i = (int *)ctl->data - cnf->data;
2393                 int ifindex;
2394
2395                 set_bit(i, cnf->state);
2396
2397                 if (cnf == net->ipv4.devconf_dflt)
2398                         devinet_copy_dflt_conf(net, i);
2399                 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2400                     i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2401                         if ((new_value == 0) && (old_value != 0))
2402                                 rt_cache_flush(net);
2403
2404                 if (i == IPV4_DEVCONF_BC_FORWARDING - 1 &&
2405                     new_value != old_value)
2406                         rt_cache_flush(net);
2407
2408                 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2409                     new_value != old_value) {
2410                         ifindex = devinet_conf_ifindex(net, cnf);
2411                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2412                                                     NETCONFA_RP_FILTER,
2413                                                     ifindex, cnf);
2414                 }
2415                 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2416                     new_value != old_value) {
2417                         ifindex = devinet_conf_ifindex(net, cnf);
2418                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2419                                                     NETCONFA_PROXY_NEIGH,
2420                                                     ifindex, cnf);
2421                 }
2422                 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2423                     new_value != old_value) {
2424                         ifindex = devinet_conf_ifindex(net, cnf);
2425                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2426                                                     NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2427                                                     ifindex, cnf);
2428                 }
2429         }
2430
2431         return ret;
2432 }
2433
2434 static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2435                                   void *buffer, size_t *lenp, loff_t *ppos)
2436 {
2437         int *valp = ctl->data;
2438         int val = *valp;
2439         loff_t pos = *ppos;
2440         int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2441
2442         if (write && *valp != val) {
2443                 struct net *net = ctl->extra2;
2444
2445                 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2446                         if (!rtnl_trylock()) {
2447                                 /* Restore the original values before restarting */
2448                                 *valp = val;
2449                                 *ppos = pos;
2450                                 return restart_syscall();
2451                         }
2452                         if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2453                                 inet_forward_change(net);
2454                         } else {
2455                                 struct ipv4_devconf *cnf = ctl->extra1;
2456                                 struct in_device *idev =
2457                                         container_of(cnf, struct in_device, cnf);
2458                                 if (*valp)
2459                                         dev_disable_lro(idev->dev);
2460                                 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2461                                                             NETCONFA_FORWARDING,
2462                                                             idev->dev->ifindex,
2463                                                             cnf);
2464                         }
2465                         rtnl_unlock();
2466                         rt_cache_flush(net);
2467                 } else
2468                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2469                                                     NETCONFA_FORWARDING,
2470                                                     NETCONFA_IFINDEX_DEFAULT,
2471                                                     net->ipv4.devconf_dflt);
2472         }
2473
2474         return ret;
2475 }
2476
2477 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2478                                 void *buffer, size_t *lenp, loff_t *ppos)
2479 {
2480         int *valp = ctl->data;
2481         int val = *valp;
2482         int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2483         struct net *net = ctl->extra2;
2484
2485         if (write && *valp != val)
2486                 rt_cache_flush(net);
2487
2488         return ret;
2489 }
2490
2491 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2492         { \
2493                 .procname       = name, \
2494                 .data           = ipv4_devconf.data + \
2495                                   IPV4_DEVCONF_ ## attr - 1, \
2496                 .maxlen         = sizeof(int), \
2497                 .mode           = mval, \
2498                 .proc_handler   = proc, \
2499                 .extra1         = &ipv4_devconf, \
2500         }
2501
2502 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2503         DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2504
2505 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2506         DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2507
2508 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2509         DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2510
2511 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2512         DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2513
2514 static struct devinet_sysctl_table {
2515         struct ctl_table_header *sysctl_header;
2516         struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2517 } devinet_sysctl = {
2518         .devinet_vars = {
2519                 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2520                                              devinet_sysctl_forward),
2521                 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2522                 DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"),
2523
2524                 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2525                 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2526                 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2527                 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2528                 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2529                 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2530                                         "accept_source_route"),
2531                 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2532                 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2533                 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2534                 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2535                 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2536                 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2537                 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2538                 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2539                 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2540                 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2541                 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2542                 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2543                 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2544                 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2545                                         "force_igmp_version"),
2546                 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2547                                         "igmpv2_unsolicited_report_interval"),
2548                 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2549                                         "igmpv3_unsolicited_report_interval"),
2550                 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2551                                         "ignore_routes_with_linkdown"),
2552                 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2553                                         "drop_gratuitous_arp"),
2554
2555                 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2556                 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2557                 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2558                                               "promote_secondaries"),
2559                 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2560                                               "route_localnet"),
2561                 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2562                                               "drop_unicast_in_l2_multicast"),
2563         },
2564 };
2565
2566 static int __devinet_sysctl_register(struct net *net, char *dev_name,
2567                                      int ifindex, struct ipv4_devconf *p)
2568 {
2569         int i;
2570         struct devinet_sysctl_table *t;
2571         char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2572
2573         t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2574         if (!t)
2575                 goto out;
2576
2577         for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2578                 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2579                 t->devinet_vars[i].extra1 = p;
2580                 t->devinet_vars[i].extra2 = net;
2581         }
2582
2583         snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2584
2585         t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2586         if (!t->sysctl_header)
2587                 goto free;
2588
2589         p->sysctl = t;
2590
2591         inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2592                                     ifindex, p);
2593         return 0;
2594
2595 free:
2596         kfree(t);
2597 out:
2598         return -ENOMEM;
2599 }
2600
2601 static void __devinet_sysctl_unregister(struct net *net,
2602                                         struct ipv4_devconf *cnf, int ifindex)
2603 {
2604         struct devinet_sysctl_table *t = cnf->sysctl;
2605
2606         if (t) {
2607                 cnf->sysctl = NULL;
2608                 unregister_net_sysctl_table(t->sysctl_header);
2609                 kfree(t);
2610         }
2611
2612         inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
2613 }
2614
2615 static int devinet_sysctl_register(struct in_device *idev)
2616 {
2617         int err;
2618
2619         if (!sysctl_dev_name_is_allowed(idev->dev->name))
2620                 return -EINVAL;
2621
2622         err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2623         if (err)
2624                 return err;
2625         err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2626                                         idev->dev->ifindex, &idev->cnf);
2627         if (err)
2628                 neigh_sysctl_unregister(idev->arp_parms);
2629         return err;
2630 }
2631
2632 static void devinet_sysctl_unregister(struct in_device *idev)
2633 {
2634         struct net *net = dev_net(idev->dev);
2635
2636         __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2637         neigh_sysctl_unregister(idev->arp_parms);
2638 }
2639
2640 static struct ctl_table ctl_forward_entry[] = {
2641         {
2642                 .procname       = "ip_forward",
2643                 .data           = &ipv4_devconf.data[
2644                                         IPV4_DEVCONF_FORWARDING - 1],
2645                 .maxlen         = sizeof(int),
2646                 .mode           = 0644,
2647                 .proc_handler   = devinet_sysctl_forward,
2648                 .extra1         = &ipv4_devconf,
2649                 .extra2         = &init_net,
2650         },
2651         { },
2652 };
2653 #endif
2654
2655 static __net_init int devinet_init_net(struct net *net)
2656 {
2657         int err;
2658         struct ipv4_devconf *all, *dflt;
2659 #ifdef CONFIG_SYSCTL
2660         struct ctl_table *tbl;
2661         struct ctl_table_header *forw_hdr;
2662 #endif
2663
2664         err = -ENOMEM;
2665         all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
2666         if (!all)
2667                 goto err_alloc_all;
2668
2669         dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2670         if (!dflt)
2671                 goto err_alloc_dflt;
2672
2673 #ifdef CONFIG_SYSCTL
2674         tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL);
2675         if (!tbl)
2676                 goto err_alloc_ctl;
2677
2678         tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2679         tbl[0].extra1 = all;
2680         tbl[0].extra2 = net;
2681 #endif
2682
2683         if (!net_eq(net, &init_net)) {
2684                 switch (net_inherit_devconf()) {
2685                 case 3:
2686                         /* copy from the current netns */
2687                         memcpy(all, current->nsproxy->net_ns->ipv4.devconf_all,
2688                                sizeof(ipv4_devconf));
2689                         memcpy(dflt,
2690                                current->nsproxy->net_ns->ipv4.devconf_dflt,
2691                                sizeof(ipv4_devconf_dflt));
2692                         break;
2693                 case 0:
2694                 case 1:
2695                         /* copy from init_net */
2696                         memcpy(all, init_net.ipv4.devconf_all,
2697                                sizeof(ipv4_devconf));
2698                         memcpy(dflt, init_net.ipv4.devconf_dflt,
2699                                sizeof(ipv4_devconf_dflt));
2700                         break;
2701                 case 2:
2702                         /* use compiled values */
2703                         break;
2704                 }
2705         }
2706
2707 #ifdef CONFIG_SYSCTL
2708         err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2709         if (err < 0)
2710                 goto err_reg_all;
2711
2712         err = __devinet_sysctl_register(net, "default",
2713                                         NETCONFA_IFINDEX_DEFAULT, dflt);
2714         if (err < 0)
2715                 goto err_reg_dflt;
2716
2717         err = -ENOMEM;
2718         forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2719         if (!forw_hdr)
2720                 goto err_reg_ctl;
2721         net->ipv4.forw_hdr = forw_hdr;
2722 #endif
2723
2724         net->ipv4.devconf_all = all;
2725         net->ipv4.devconf_dflt = dflt;
2726         return 0;
2727
2728 #ifdef CONFIG_SYSCTL
2729 err_reg_ctl:
2730         __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2731 err_reg_dflt:
2732         __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2733 err_reg_all:
2734         kfree(tbl);
2735 err_alloc_ctl:
2736 #endif
2737         kfree(dflt);
2738 err_alloc_dflt:
2739         kfree(all);
2740 err_alloc_all:
2741         return err;
2742 }
2743
2744 static __net_exit void devinet_exit_net(struct net *net)
2745 {
2746 #ifdef CONFIG_SYSCTL
2747         struct ctl_table *tbl;
2748
2749         tbl = net->ipv4.forw_hdr->ctl_table_arg;
2750         unregister_net_sysctl_table(net->ipv4.forw_hdr);
2751         __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2752                                     NETCONFA_IFINDEX_DEFAULT);
2753         __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2754                                     NETCONFA_IFINDEX_ALL);
2755         kfree(tbl);
2756 #endif
2757         kfree(net->ipv4.devconf_dflt);
2758         kfree(net->ipv4.devconf_all);
2759 }
2760
2761 static __net_initdata struct pernet_operations devinet_ops = {
2762         .init = devinet_init_net,
2763         .exit = devinet_exit_net,
2764 };
2765
2766 static struct rtnl_af_ops inet_af_ops __read_mostly = {
2767         .family           = AF_INET,
2768         .fill_link_af     = inet_fill_link_af,
2769         .get_link_af_size = inet_get_link_af_size,
2770         .validate_link_af = inet_validate_link_af,
2771         .set_link_af      = inet_set_link_af,
2772 };
2773
2774 void __init devinet_init(void)
2775 {
2776         int i;
2777
2778         for (i = 0; i < IN4_ADDR_HSIZE; i++)
2779                 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2780
2781         register_pernet_subsys(&devinet_ops);
2782         register_netdevice_notifier(&ip_netdev_notifier);
2783
2784         queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2785
2786         rtnl_af_register(&inet_af_ops);
2787
2788         rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2789         rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2790         rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
2791         rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2792                       inet_netconf_dump_devconf, 0);
2793 }