1 /* 2 * NET3 IP device support routines. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Derived from the IP parts of dev.c 1.0.19 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * Mark Evans, <evansmp@uhura.aston.ac.uk> 13 * 14 * Additional Authors: 15 * Alan Cox, <gw4pts@gw4pts.ampr.org> 16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 17 * 18 * Changes: 19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr 20 * lists. 21 * Cyrus Durgin: updated for kmod 22 * Matthias Andree: in devinet_ioctl, compare label and 23 * address (4.4BSD alias style support), 24 * fall back to comparing just the label 25 * if no match found. 26 */ 27 28 29 #include <linux/uaccess.h> 30 #include <linux/bitops.h> 31 #include <linux/capability.h> 32 #include <linux/module.h> 33 #include <linux/types.h> 34 #include <linux/kernel.h> 35 #include <linux/sched/signal.h> 36 #include <linux/string.h> 37 #include <linux/mm.h> 38 #include <linux/socket.h> 39 #include <linux/sockios.h> 40 #include <linux/in.h> 41 #include <linux/errno.h> 42 #include <linux/interrupt.h> 43 #include <linux/if_addr.h> 44 #include <linux/if_ether.h> 45 #include <linux/inet.h> 46 #include <linux/netdevice.h> 47 #include <linux/etherdevice.h> 48 #include <linux/skbuff.h> 49 #include <linux/init.h> 50 #include <linux/notifier.h> 51 #include <linux/inetdevice.h> 52 #include <linux/igmp.h> 53 #include <linux/slab.h> 54 #include <linux/hash.h> 55 #ifdef CONFIG_SYSCTL 56 #include <linux/sysctl.h> 57 #endif 58 #include <linux/kmod.h> 59 #include <linux/netconf.h> 60 61 #include <net/arp.h> 62 #include <net/ip.h> 63 #include <net/route.h> 64 #include <net/ip_fib.h> 65 #include <net/rtnetlink.h> 66 #include <net/net_namespace.h> 67 #include <net/addrconf.h> 68 69 static struct ipv4_devconf ipv4_devconf = { 70 .data = { 71 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, 72 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, 73 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, 74 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, 75 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/, 76 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/, 77 }, 78 }; 79 80 static struct ipv4_devconf ipv4_devconf_dflt = { 81 .data = { 82 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, 83 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, 84 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, 85 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, 86 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1, 87 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/, 88 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/, 89 }, 90 }; 91 92 #define IPV4_DEVCONF_DFLT(net, attr) \ 93 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) 94 95 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { 96 [IFA_LOCAL] = { .type = NLA_U32 }, 97 [IFA_ADDRESS] = { .type = NLA_U32 }, 98 [IFA_BROADCAST] = { .type = NLA_U32 }, 99 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, 100 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 101 [IFA_FLAGS] = { .type = NLA_U32 }, 102 }; 103 104 #define IN4_ADDR_HSIZE_SHIFT 8 105 #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT) 106 107 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE]; 108 109 static u32 inet_addr_hash(const struct net *net, __be32 addr) 110 { 111 u32 val = (__force u32) addr ^ net_hash_mix(net); 112 113 return hash_32(val, IN4_ADDR_HSIZE_SHIFT); 114 } 115 116 static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) 117 { 118 u32 hash = inet_addr_hash(net, ifa->ifa_local); 119 120 ASSERT_RTNL(); 121 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); 122 } 123 124 static void inet_hash_remove(struct in_ifaddr *ifa) 125 { 126 ASSERT_RTNL(); 127 hlist_del_init_rcu(&ifa->hash); 128 } 129 130 /** 131 * __ip_dev_find - find the first device with a given source address. 132 * @net: the net namespace 133 * @addr: the source address 134 * @devref: if true, take a reference on the found device 135 * 136 * If a caller uses devref=false, it should be protected by RCU, or RTNL 137 */ 138 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) 139 { 140 struct net_device *result = NULL; 141 struct in_ifaddr *ifa; 142 143 rcu_read_lock(); 144 ifa = inet_lookup_ifaddr_rcu(net, addr); 145 if (!ifa) { 146 struct flowi4 fl4 = { .daddr = addr }; 147 struct fib_result res = { 0 }; 148 struct fib_table *local; 149 150 /* Fallback to FIB local table so that communication 151 * over loopback subnets work. 152 */ 153 local = fib_get_table(net, RT_TABLE_LOCAL); 154 if (local && 155 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) && 156 res.type == RTN_LOCAL) 157 result = FIB_RES_DEV(res); 158 } else { 159 result = ifa->ifa_dev->dev; 160 } 161 if (result && devref) 162 dev_hold(result); 163 rcu_read_unlock(); 164 return result; 165 } 166 EXPORT_SYMBOL(__ip_dev_find); 167 168 /* called under RCU lock */ 169 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr) 170 { 171 u32 hash = inet_addr_hash(net, addr); 172 struct in_ifaddr *ifa; 173 174 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) 175 if (ifa->ifa_local == addr && 176 net_eq(dev_net(ifa->ifa_dev->dev), net)) 177 return ifa; 178 179 return NULL; 180 } 181 182 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); 183 184 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); 185 static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain); 186 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 187 int destroy); 188 #ifdef CONFIG_SYSCTL 189 static int devinet_sysctl_register(struct in_device *idev); 190 static void devinet_sysctl_unregister(struct in_device *idev); 191 #else 192 static int devinet_sysctl_register(struct in_device *idev) 193 { 194 return 0; 195 } 196 static void devinet_sysctl_unregister(struct in_device *idev) 197 { 198 } 199 #endif 200 201 /* Locks all the inet devices. */ 202 203 static struct in_ifaddr *inet_alloc_ifa(void) 204 { 205 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); 206 } 207 208 static void inet_rcu_free_ifa(struct rcu_head *head) 209 { 210 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); 211 if (ifa->ifa_dev) 212 in_dev_put(ifa->ifa_dev); 213 kfree(ifa); 214 } 215 216 static void inet_free_ifa(struct in_ifaddr *ifa) 217 { 218 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); 219 } 220 221 void in_dev_finish_destroy(struct in_device *idev) 222 { 223 struct net_device *dev = idev->dev; 224 225 WARN_ON(idev->ifa_list); 226 WARN_ON(idev->mc_list); 227 kfree(rcu_dereference_protected(idev->mc_hash, 1)); 228 #ifdef NET_REFCNT_DEBUG 229 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL"); 230 #endif 231 dev_put(dev); 232 if (!idev->dead) 233 pr_err("Freeing alive in_device %p\n", idev); 234 else 235 kfree(idev); 236 } 237 EXPORT_SYMBOL(in_dev_finish_destroy); 238 239 static struct in_device *inetdev_init(struct net_device *dev) 240 { 241 struct in_device *in_dev; 242 int err = -ENOMEM; 243 244 ASSERT_RTNL(); 245 246 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); 247 if (!in_dev) 248 goto out; 249 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, 250 sizeof(in_dev->cnf)); 251 in_dev->cnf.sysctl = NULL; 252 in_dev->dev = dev; 253 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); 254 if (!in_dev->arp_parms) 255 goto out_kfree; 256 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) 257 dev_disable_lro(dev); 258 /* Reference in_dev->dev */ 259 dev_hold(dev); 260 /* Account for reference dev->ip_ptr (below) */ 261 refcount_set(&in_dev->refcnt, 1); 262 263 err = devinet_sysctl_register(in_dev); 264 if (err) { 265 in_dev->dead = 1; 266 in_dev_put(in_dev); 267 in_dev = NULL; 268 goto out; 269 } 270 ip_mc_init_dev(in_dev); 271 if (dev->flags & IFF_UP) 272 ip_mc_up(in_dev); 273 274 /* we can receive as soon as ip_ptr is set -- do this last */ 275 rcu_assign_pointer(dev->ip_ptr, in_dev); 276 out: 277 return in_dev ?: ERR_PTR(err); 278 out_kfree: 279 kfree(in_dev); 280 in_dev = NULL; 281 goto out; 282 } 283 284 static void in_dev_rcu_put(struct rcu_head *head) 285 { 286 struct in_device *idev = container_of(head, struct in_device, rcu_head); 287 in_dev_put(idev); 288 } 289 290 static void inetdev_destroy(struct in_device *in_dev) 291 { 292 struct in_ifaddr *ifa; 293 struct net_device *dev; 294 295 ASSERT_RTNL(); 296 297 dev = in_dev->dev; 298 299 in_dev->dead = 1; 300 301 ip_mc_destroy_dev(in_dev); 302 303 while ((ifa = in_dev->ifa_list) != NULL) { 304 inet_del_ifa(in_dev, &in_dev->ifa_list, 0); 305 inet_free_ifa(ifa); 306 } 307 308 RCU_INIT_POINTER(dev->ip_ptr, NULL); 309 310 devinet_sysctl_unregister(in_dev); 311 neigh_parms_release(&arp_tbl, in_dev->arp_parms); 312 arp_ifdown(dev); 313 314 call_rcu(&in_dev->rcu_head, in_dev_rcu_put); 315 } 316 317 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) 318 { 319 rcu_read_lock(); 320 for_primary_ifa(in_dev) { 321 if (inet_ifa_match(a, ifa)) { 322 if (!b || inet_ifa_match(b, ifa)) { 323 rcu_read_unlock(); 324 return 1; 325 } 326 } 327 } endfor_ifa(in_dev); 328 rcu_read_unlock(); 329 return 0; 330 } 331 332 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 333 int destroy, struct nlmsghdr *nlh, u32 portid) 334 { 335 struct in_ifaddr *promote = NULL; 336 struct in_ifaddr *ifa, *ifa1 = *ifap; 337 struct in_ifaddr *last_prim = in_dev->ifa_list; 338 struct in_ifaddr *prev_prom = NULL; 339 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); 340 341 ASSERT_RTNL(); 342 343 if (in_dev->dead) 344 goto no_promotions; 345 346 /* 1. Deleting primary ifaddr forces deletion all secondaries 347 * unless alias promotion is set 348 **/ 349 350 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { 351 struct in_ifaddr **ifap1 = &ifa1->ifa_next; 352 353 while ((ifa = *ifap1) != NULL) { 354 if (!(ifa->ifa_flags & IFA_F_SECONDARY) && 355 ifa1->ifa_scope <= ifa->ifa_scope) 356 last_prim = ifa; 357 358 if (!(ifa->ifa_flags & IFA_F_SECONDARY) || 359 ifa1->ifa_mask != ifa->ifa_mask || 360 !inet_ifa_match(ifa1->ifa_address, ifa)) { 361 ifap1 = &ifa->ifa_next; 362 prev_prom = ifa; 363 continue; 364 } 365 366 if (!do_promote) { 367 inet_hash_remove(ifa); 368 *ifap1 = ifa->ifa_next; 369 370 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid); 371 blocking_notifier_call_chain(&inetaddr_chain, 372 NETDEV_DOWN, ifa); 373 inet_free_ifa(ifa); 374 } else { 375 promote = ifa; 376 break; 377 } 378 } 379 } 380 381 /* On promotion all secondaries from subnet are changing 382 * the primary IP, we must remove all their routes silently 383 * and later to add them back with new prefsrc. Do this 384 * while all addresses are on the device list. 385 */ 386 for (ifa = promote; ifa; ifa = ifa->ifa_next) { 387 if (ifa1->ifa_mask == ifa->ifa_mask && 388 inet_ifa_match(ifa1->ifa_address, ifa)) 389 fib_del_ifaddr(ifa, ifa1); 390 } 391 392 no_promotions: 393 /* 2. Unlink it */ 394 395 *ifap = ifa1->ifa_next; 396 inet_hash_remove(ifa1); 397 398 /* 3. Announce address deletion */ 399 400 /* Send message first, then call notifier. 401 At first sight, FIB update triggered by notifier 402 will refer to already deleted ifaddr, that could confuse 403 netlink listeners. It is not true: look, gated sees 404 that route deleted and if it still thinks that ifaddr 405 is valid, it will try to restore deleted routes... Grr. 406 So that, this order is correct. 407 */ 408 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid); 409 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); 410 411 if (promote) { 412 struct in_ifaddr *next_sec = promote->ifa_next; 413 414 if (prev_prom) { 415 prev_prom->ifa_next = promote->ifa_next; 416 promote->ifa_next = last_prim->ifa_next; 417 last_prim->ifa_next = promote; 418 } 419 420 promote->ifa_flags &= ~IFA_F_SECONDARY; 421 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid); 422 blocking_notifier_call_chain(&inetaddr_chain, 423 NETDEV_UP, promote); 424 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) { 425 if (ifa1->ifa_mask != ifa->ifa_mask || 426 !inet_ifa_match(ifa1->ifa_address, ifa)) 427 continue; 428 fib_add_ifaddr(ifa); 429 } 430 431 } 432 if (destroy) 433 inet_free_ifa(ifa1); 434 } 435 436 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 437 int destroy) 438 { 439 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); 440 } 441 442 static void check_lifetime(struct work_struct *work); 443 444 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime); 445 446 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, 447 u32 portid, struct netlink_ext_ack *extack) 448 { 449 struct in_device *in_dev = ifa->ifa_dev; 450 struct in_ifaddr *ifa1, **ifap, **last_primary; 451 struct in_validator_info ivi; 452 int ret; 453 454 ASSERT_RTNL(); 455 456 if (!ifa->ifa_local) { 457 inet_free_ifa(ifa); 458 return 0; 459 } 460 461 ifa->ifa_flags &= ~IFA_F_SECONDARY; 462 last_primary = &in_dev->ifa_list; 463 464 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 465 ifap = &ifa1->ifa_next) { 466 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && 467 ifa->ifa_scope <= ifa1->ifa_scope) 468 last_primary = &ifa1->ifa_next; 469 if (ifa1->ifa_mask == ifa->ifa_mask && 470 inet_ifa_match(ifa1->ifa_address, ifa)) { 471 if (ifa1->ifa_local == ifa->ifa_local) { 472 inet_free_ifa(ifa); 473 return -EEXIST; 474 } 475 if (ifa1->ifa_scope != ifa->ifa_scope) { 476 inet_free_ifa(ifa); 477 return -EINVAL; 478 } 479 ifa->ifa_flags |= IFA_F_SECONDARY; 480 } 481 } 482 483 /* Allow any devices that wish to register ifaddr validtors to weigh 484 * in now, before changes are committed. The rntl lock is serializing 485 * access here, so the state should not change between a validator call 486 * and a final notify on commit. This isn't invoked on promotion under 487 * the assumption that validators are checking the address itself, and 488 * not the flags. 489 */ 490 ivi.ivi_addr = ifa->ifa_address; 491 ivi.ivi_dev = ifa->ifa_dev; 492 ivi.extack = extack; 493 ret = blocking_notifier_call_chain(&inetaddr_validator_chain, 494 NETDEV_UP, &ivi); 495 ret = notifier_to_errno(ret); 496 if (ret) { 497 inet_free_ifa(ifa); 498 return ret; 499 } 500 501 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { 502 prandom_seed((__force u32) ifa->ifa_local); 503 ifap = last_primary; 504 } 505 506 ifa->ifa_next = *ifap; 507 *ifap = ifa; 508 509 inet_hash_insert(dev_net(in_dev->dev), ifa); 510 511 cancel_delayed_work(&check_lifetime_work); 512 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); 513 514 /* Send message first, then call notifier. 515 Notifier will trigger FIB update, so that 516 listeners of netlink will know about new ifaddr */ 517 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid); 518 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 519 520 return 0; 521 } 522 523 static int inet_insert_ifa(struct in_ifaddr *ifa) 524 { 525 return __inet_insert_ifa(ifa, NULL, 0, NULL); 526 } 527 528 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) 529 { 530 struct in_device *in_dev = __in_dev_get_rtnl(dev); 531 532 ASSERT_RTNL(); 533 534 if (!in_dev) { 535 inet_free_ifa(ifa); 536 return -ENOBUFS; 537 } 538 ipv4_devconf_setall(in_dev); 539 neigh_parms_data_state_setall(in_dev->arp_parms); 540 if (ifa->ifa_dev != in_dev) { 541 WARN_ON(ifa->ifa_dev); 542 in_dev_hold(in_dev); 543 ifa->ifa_dev = in_dev; 544 } 545 if (ipv4_is_loopback(ifa->ifa_local)) 546 ifa->ifa_scope = RT_SCOPE_HOST; 547 return inet_insert_ifa(ifa); 548 } 549 550 /* Caller must hold RCU or RTNL : 551 * We dont take a reference on found in_device 552 */ 553 struct in_device *inetdev_by_index(struct net *net, int ifindex) 554 { 555 struct net_device *dev; 556 struct in_device *in_dev = NULL; 557 558 rcu_read_lock(); 559 dev = dev_get_by_index_rcu(net, ifindex); 560 if (dev) 561 in_dev = rcu_dereference_rtnl(dev->ip_ptr); 562 rcu_read_unlock(); 563 return in_dev; 564 } 565 EXPORT_SYMBOL(inetdev_by_index); 566 567 /* Called only from RTNL semaphored context. No locks. */ 568 569 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, 570 __be32 mask) 571 { 572 ASSERT_RTNL(); 573 574 for_primary_ifa(in_dev) { 575 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) 576 return ifa; 577 } endfor_ifa(in_dev); 578 return NULL; 579 } 580 581 static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa) 582 { 583 struct ip_mreqn mreq = { 584 .imr_multiaddr.s_addr = ifa->ifa_address, 585 .imr_ifindex = ifa->ifa_dev->dev->ifindex, 586 }; 587 int ret; 588 589 ASSERT_RTNL(); 590 591 lock_sock(sk); 592 if (join) 593 ret = ip_mc_join_group(sk, &mreq); 594 else 595 ret = ip_mc_leave_group(sk, &mreq); 596 release_sock(sk); 597 598 return ret; 599 } 600 601 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 602 struct netlink_ext_ack *extack) 603 { 604 struct net *net = sock_net(skb->sk); 605 struct nlattr *tb[IFA_MAX+1]; 606 struct in_device *in_dev; 607 struct ifaddrmsg *ifm; 608 struct in_ifaddr *ifa, **ifap; 609 int err = -EINVAL; 610 611 ASSERT_RTNL(); 612 613 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy, 614 extack); 615 if (err < 0) 616 goto errout; 617 618 ifm = nlmsg_data(nlh); 619 in_dev = inetdev_by_index(net, ifm->ifa_index); 620 if (!in_dev) { 621 err = -ENODEV; 622 goto errout; 623 } 624 625 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 626 ifap = &ifa->ifa_next) { 627 if (tb[IFA_LOCAL] && 628 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL])) 629 continue; 630 631 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) 632 continue; 633 634 if (tb[IFA_ADDRESS] && 635 (ifm->ifa_prefixlen != ifa->ifa_prefixlen || 636 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa))) 637 continue; 638 639 if (ipv4_is_multicast(ifa->ifa_address)) 640 ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa); 641 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); 642 return 0; 643 } 644 645 err = -EADDRNOTAVAIL; 646 errout: 647 return err; 648 } 649 650 #define INFINITY_LIFE_TIME 0xFFFFFFFF 651 652 static void check_lifetime(struct work_struct *work) 653 { 654 unsigned long now, next, next_sec, next_sched; 655 struct in_ifaddr *ifa; 656 struct hlist_node *n; 657 int i; 658 659 now = jiffies; 660 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 661 662 for (i = 0; i < IN4_ADDR_HSIZE; i++) { 663 bool change_needed = false; 664 665 rcu_read_lock(); 666 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) { 667 unsigned long age; 668 669 if (ifa->ifa_flags & IFA_F_PERMANENT) 670 continue; 671 672 /* We try to batch several events at once. */ 673 age = (now - ifa->ifa_tstamp + 674 ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 675 676 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && 677 age >= ifa->ifa_valid_lft) { 678 change_needed = true; 679 } else if (ifa->ifa_preferred_lft == 680 INFINITY_LIFE_TIME) { 681 continue; 682 } else if (age >= ifa->ifa_preferred_lft) { 683 if (time_before(ifa->ifa_tstamp + 684 ifa->ifa_valid_lft * HZ, next)) 685 next = ifa->ifa_tstamp + 686 ifa->ifa_valid_lft * HZ; 687 688 if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) 689 change_needed = true; 690 } else if (time_before(ifa->ifa_tstamp + 691 ifa->ifa_preferred_lft * HZ, 692 next)) { 693 next = ifa->ifa_tstamp + 694 ifa->ifa_preferred_lft * HZ; 695 } 696 } 697 rcu_read_unlock(); 698 if (!change_needed) 699 continue; 700 rtnl_lock(); 701 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) { 702 unsigned long age; 703 704 if (ifa->ifa_flags & IFA_F_PERMANENT) 705 continue; 706 707 /* We try to batch several events at once. */ 708 age = (now - ifa->ifa_tstamp + 709 ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 710 711 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && 712 age >= ifa->ifa_valid_lft) { 713 struct in_ifaddr **ifap; 714 715 for (ifap = &ifa->ifa_dev->ifa_list; 716 *ifap != NULL; ifap = &(*ifap)->ifa_next) { 717 if (*ifap == ifa) { 718 inet_del_ifa(ifa->ifa_dev, 719 ifap, 1); 720 break; 721 } 722 } 723 } else if (ifa->ifa_preferred_lft != 724 INFINITY_LIFE_TIME && 725 age >= ifa->ifa_preferred_lft && 726 !(ifa->ifa_flags & IFA_F_DEPRECATED)) { 727 ifa->ifa_flags |= IFA_F_DEPRECATED; 728 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 729 } 730 } 731 rtnl_unlock(); 732 } 733 734 next_sec = round_jiffies_up(next); 735 next_sched = next; 736 737 /* If rounded timeout is accurate enough, accept it. */ 738 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 739 next_sched = next_sec; 740 741 now = jiffies; 742 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 743 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX)) 744 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX; 745 746 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 747 next_sched - now); 748 } 749 750 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, 751 __u32 prefered_lft) 752 { 753 unsigned long timeout; 754 755 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); 756 757 timeout = addrconf_timeout_fixup(valid_lft, HZ); 758 if (addrconf_finite_timeout(timeout)) 759 ifa->ifa_valid_lft = timeout; 760 else 761 ifa->ifa_flags |= IFA_F_PERMANENT; 762 763 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 764 if (addrconf_finite_timeout(timeout)) { 765 if (timeout == 0) 766 ifa->ifa_flags |= IFA_F_DEPRECATED; 767 ifa->ifa_preferred_lft = timeout; 768 } 769 ifa->ifa_tstamp = jiffies; 770 if (!ifa->ifa_cstamp) 771 ifa->ifa_cstamp = ifa->ifa_tstamp; 772 } 773 774 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, 775 __u32 *pvalid_lft, __u32 *pprefered_lft) 776 { 777 struct nlattr *tb[IFA_MAX+1]; 778 struct in_ifaddr *ifa; 779 struct ifaddrmsg *ifm; 780 struct net_device *dev; 781 struct in_device *in_dev; 782 int err; 783 784 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy, 785 NULL); 786 if (err < 0) 787 goto errout; 788 789 ifm = nlmsg_data(nlh); 790 err = -EINVAL; 791 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL]) 792 goto errout; 793 794 dev = __dev_get_by_index(net, ifm->ifa_index); 795 err = -ENODEV; 796 if (!dev) 797 goto errout; 798 799 in_dev = __in_dev_get_rtnl(dev); 800 err = -ENOBUFS; 801 if (!in_dev) 802 goto errout; 803 804 ifa = inet_alloc_ifa(); 805 if (!ifa) 806 /* 807 * A potential indev allocation can be left alive, it stays 808 * assigned to its device and is destroy with it. 809 */ 810 goto errout; 811 812 ipv4_devconf_setall(in_dev); 813 neigh_parms_data_state_setall(in_dev->arp_parms); 814 in_dev_hold(in_dev); 815 816 if (!tb[IFA_ADDRESS]) 817 tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 818 819 INIT_HLIST_NODE(&ifa->hash); 820 ifa->ifa_prefixlen = ifm->ifa_prefixlen; 821 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 822 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : 823 ifm->ifa_flags; 824 ifa->ifa_scope = ifm->ifa_scope; 825 ifa->ifa_dev = in_dev; 826 827 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]); 828 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]); 829 830 if (tb[IFA_BROADCAST]) 831 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]); 832 833 if (tb[IFA_LABEL]) 834 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 835 else 836 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 837 838 if (tb[IFA_CACHEINFO]) { 839 struct ifa_cacheinfo *ci; 840 841 ci = nla_data(tb[IFA_CACHEINFO]); 842 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { 843 err = -EINVAL; 844 goto errout_free; 845 } 846 *pvalid_lft = ci->ifa_valid; 847 *pprefered_lft = ci->ifa_prefered; 848 } 849 850 return ifa; 851 852 errout_free: 853 inet_free_ifa(ifa); 854 errout: 855 return ERR_PTR(err); 856 } 857 858 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) 859 { 860 struct in_device *in_dev = ifa->ifa_dev; 861 struct in_ifaddr *ifa1, **ifap; 862 863 if (!ifa->ifa_local) 864 return NULL; 865 866 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 867 ifap = &ifa1->ifa_next) { 868 if (ifa1->ifa_mask == ifa->ifa_mask && 869 inet_ifa_match(ifa1->ifa_address, ifa) && 870 ifa1->ifa_local == ifa->ifa_local) 871 return ifa1; 872 } 873 return NULL; 874 } 875 876 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 877 struct netlink_ext_ack *extack) 878 { 879 struct net *net = sock_net(skb->sk); 880 struct in_ifaddr *ifa; 881 struct in_ifaddr *ifa_existing; 882 __u32 valid_lft = INFINITY_LIFE_TIME; 883 __u32 prefered_lft = INFINITY_LIFE_TIME; 884 885 ASSERT_RTNL(); 886 887 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft); 888 if (IS_ERR(ifa)) 889 return PTR_ERR(ifa); 890 891 ifa_existing = find_matching_ifa(ifa); 892 if (!ifa_existing) { 893 /* It would be best to check for !NLM_F_CREATE here but 894 * userspace already relies on not having to provide this. 895 */ 896 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 897 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) { 898 int ret = ip_mc_config(net->ipv4.mc_autojoin_sk, 899 true, ifa); 900 901 if (ret < 0) { 902 inet_free_ifa(ifa); 903 return ret; 904 } 905 } 906 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid, 907 extack); 908 } else { 909 inet_free_ifa(ifa); 910 911 if (nlh->nlmsg_flags & NLM_F_EXCL || 912 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 913 return -EEXIST; 914 ifa = ifa_existing; 915 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 916 cancel_delayed_work(&check_lifetime_work); 917 queue_delayed_work(system_power_efficient_wq, 918 &check_lifetime_work, 0); 919 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); 920 } 921 return 0; 922 } 923 924 /* 925 * Determine a default network mask, based on the IP address. 926 */ 927 928 static int inet_abc_len(__be32 addr) 929 { 930 int rc = -1; /* Something else, probably a multicast. */ 931 932 if (ipv4_is_zeronet(addr)) 933 rc = 0; 934 else { 935 __u32 haddr = ntohl(addr); 936 937 if (IN_CLASSA(haddr)) 938 rc = 8; 939 else if (IN_CLASSB(haddr)) 940 rc = 16; 941 else if (IN_CLASSC(haddr)) 942 rc = 24; 943 } 944 945 return rc; 946 } 947 948 949 int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr) 950 { 951 struct sockaddr_in sin_orig; 952 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr; 953 struct in_device *in_dev; 954 struct in_ifaddr **ifap = NULL; 955 struct in_ifaddr *ifa = NULL; 956 struct net_device *dev; 957 char *colon; 958 int ret = -EFAULT; 959 int tryaddrmatch = 0; 960 961 ifr->ifr_name[IFNAMSIZ - 1] = 0; 962 963 /* save original address for comparison */ 964 memcpy(&sin_orig, sin, sizeof(*sin)); 965 966 colon = strchr(ifr->ifr_name, ':'); 967 if (colon) 968 *colon = 0; 969 970 dev_load(net, ifr->ifr_name); 971 972 switch (cmd) { 973 case SIOCGIFADDR: /* Get interface address */ 974 case SIOCGIFBRDADDR: /* Get the broadcast address */ 975 case SIOCGIFDSTADDR: /* Get the destination address */ 976 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 977 /* Note that these ioctls will not sleep, 978 so that we do not impose a lock. 979 One day we will be forced to put shlock here (I mean SMP) 980 */ 981 tryaddrmatch = (sin_orig.sin_family == AF_INET); 982 memset(sin, 0, sizeof(*sin)); 983 sin->sin_family = AF_INET; 984 break; 985 986 case SIOCSIFFLAGS: 987 ret = -EPERM; 988 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 989 goto out; 990 break; 991 case SIOCSIFADDR: /* Set interface address (and family) */ 992 case SIOCSIFBRDADDR: /* Set the broadcast address */ 993 case SIOCSIFDSTADDR: /* Set the destination address */ 994 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 995 ret = -EPERM; 996 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 997 goto out; 998 ret = -EINVAL; 999 if (sin->sin_family != AF_INET) 1000 goto out; 1001 break; 1002 default: 1003 ret = -EINVAL; 1004 goto out; 1005 } 1006 1007 rtnl_lock(); 1008 1009 ret = -ENODEV; 1010 dev = __dev_get_by_name(net, ifr->ifr_name); 1011 if (!dev) 1012 goto done; 1013 1014 if (colon) 1015 *colon = ':'; 1016 1017 in_dev = __in_dev_get_rtnl(dev); 1018 if (in_dev) { 1019 if (tryaddrmatch) { 1020 /* Matthias Andree */ 1021 /* compare label and address (4.4BSD style) */ 1022 /* note: we only do this for a limited set of ioctls 1023 and only if the original address family was AF_INET. 1024 This is checked above. */ 1025 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 1026 ifap = &ifa->ifa_next) { 1027 if (!strcmp(ifr->ifr_name, ifa->ifa_label) && 1028 sin_orig.sin_addr.s_addr == 1029 ifa->ifa_local) { 1030 break; /* found */ 1031 } 1032 } 1033 } 1034 /* we didn't get a match, maybe the application is 1035 4.3BSD-style and passed in junk so we fall back to 1036 comparing just the label */ 1037 if (!ifa) { 1038 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 1039 ifap = &ifa->ifa_next) 1040 if (!strcmp(ifr->ifr_name, ifa->ifa_label)) 1041 break; 1042 } 1043 } 1044 1045 ret = -EADDRNOTAVAIL; 1046 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 1047 goto done; 1048 1049 switch (cmd) { 1050 case SIOCGIFADDR: /* Get interface address */ 1051 ret = 0; 1052 sin->sin_addr.s_addr = ifa->ifa_local; 1053 break; 1054 1055 case SIOCGIFBRDADDR: /* Get the broadcast address */ 1056 ret = 0; 1057 sin->sin_addr.s_addr = ifa->ifa_broadcast; 1058 break; 1059 1060 case SIOCGIFDSTADDR: /* Get the destination address */ 1061 ret = 0; 1062 sin->sin_addr.s_addr = ifa->ifa_address; 1063 break; 1064 1065 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 1066 ret = 0; 1067 sin->sin_addr.s_addr = ifa->ifa_mask; 1068 break; 1069 1070 case SIOCSIFFLAGS: 1071 if (colon) { 1072 ret = -EADDRNOTAVAIL; 1073 if (!ifa) 1074 break; 1075 ret = 0; 1076 if (!(ifr->ifr_flags & IFF_UP)) 1077 inet_del_ifa(in_dev, ifap, 1); 1078 break; 1079 } 1080 ret = dev_change_flags(dev, ifr->ifr_flags); 1081 break; 1082 1083 case SIOCSIFADDR: /* Set interface address (and family) */ 1084 ret = -EINVAL; 1085 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1086 break; 1087 1088 if (!ifa) { 1089 ret = -ENOBUFS; 1090 ifa = inet_alloc_ifa(); 1091 if (!ifa) 1092 break; 1093 INIT_HLIST_NODE(&ifa->hash); 1094 if (colon) 1095 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ); 1096 else 1097 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1098 } else { 1099 ret = 0; 1100 if (ifa->ifa_local == sin->sin_addr.s_addr) 1101 break; 1102 inet_del_ifa(in_dev, ifap, 0); 1103 ifa->ifa_broadcast = 0; 1104 ifa->ifa_scope = 0; 1105 } 1106 1107 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 1108 1109 if (!(dev->flags & IFF_POINTOPOINT)) { 1110 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 1111 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 1112 if ((dev->flags & IFF_BROADCAST) && 1113 ifa->ifa_prefixlen < 31) 1114 ifa->ifa_broadcast = ifa->ifa_address | 1115 ~ifa->ifa_mask; 1116 } else { 1117 ifa->ifa_prefixlen = 32; 1118 ifa->ifa_mask = inet_make_mask(32); 1119 } 1120 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 1121 ret = inet_set_ifa(dev, ifa); 1122 break; 1123 1124 case SIOCSIFBRDADDR: /* Set the broadcast address */ 1125 ret = 0; 1126 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 1127 inet_del_ifa(in_dev, ifap, 0); 1128 ifa->ifa_broadcast = sin->sin_addr.s_addr; 1129 inet_insert_ifa(ifa); 1130 } 1131 break; 1132 1133 case SIOCSIFDSTADDR: /* Set the destination address */ 1134 ret = 0; 1135 if (ifa->ifa_address == sin->sin_addr.s_addr) 1136 break; 1137 ret = -EINVAL; 1138 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1139 break; 1140 ret = 0; 1141 inet_del_ifa(in_dev, ifap, 0); 1142 ifa->ifa_address = sin->sin_addr.s_addr; 1143 inet_insert_ifa(ifa); 1144 break; 1145 1146 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 1147 1148 /* 1149 * The mask we set must be legal. 1150 */ 1151 ret = -EINVAL; 1152 if (bad_mask(sin->sin_addr.s_addr, 0)) 1153 break; 1154 ret = 0; 1155 if (ifa->ifa_mask != sin->sin_addr.s_addr) { 1156 __be32 old_mask = ifa->ifa_mask; 1157 inet_del_ifa(in_dev, ifap, 0); 1158 ifa->ifa_mask = sin->sin_addr.s_addr; 1159 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 1160 1161 /* See if current broadcast address matches 1162 * with current netmask, then recalculate 1163 * the broadcast address. Otherwise it's a 1164 * funny address, so don't touch it since 1165 * the user seems to know what (s)he's doing... 1166 */ 1167 if ((dev->flags & IFF_BROADCAST) && 1168 (ifa->ifa_prefixlen < 31) && 1169 (ifa->ifa_broadcast == 1170 (ifa->ifa_local|~old_mask))) { 1171 ifa->ifa_broadcast = (ifa->ifa_local | 1172 ~sin->sin_addr.s_addr); 1173 } 1174 inet_insert_ifa(ifa); 1175 } 1176 break; 1177 } 1178 done: 1179 rtnl_unlock(); 1180 out: 1181 return ret; 1182 } 1183 1184 static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size) 1185 { 1186 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1187 struct in_ifaddr *ifa; 1188 struct ifreq ifr; 1189 int done = 0; 1190 1191 if (WARN_ON(size > sizeof(struct ifreq))) 1192 goto out; 1193 1194 if (!in_dev) 1195 goto out; 1196 1197 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1198 if (!buf) { 1199 done += size; 1200 continue; 1201 } 1202 if (len < size) 1203 break; 1204 memset(&ifr, 0, sizeof(struct ifreq)); 1205 strcpy(ifr.ifr_name, ifa->ifa_label); 1206 1207 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 1208 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 1209 ifa->ifa_local; 1210 1211 if (copy_to_user(buf + done, &ifr, size)) { 1212 done = -EFAULT; 1213 break; 1214 } 1215 len -= size; 1216 done += size; 1217 } 1218 out: 1219 return done; 1220 } 1221 1222 static __be32 in_dev_select_addr(const struct in_device *in_dev, 1223 int scope) 1224 { 1225 for_primary_ifa(in_dev) { 1226 if (ifa->ifa_scope != RT_SCOPE_LINK && 1227 ifa->ifa_scope <= scope) 1228 return ifa->ifa_local; 1229 } endfor_ifa(in_dev); 1230 1231 return 0; 1232 } 1233 1234 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 1235 { 1236 __be32 addr = 0; 1237 struct in_device *in_dev; 1238 struct net *net = dev_net(dev); 1239 int master_idx; 1240 1241 rcu_read_lock(); 1242 in_dev = __in_dev_get_rcu(dev); 1243 if (!in_dev) 1244 goto no_in_dev; 1245 1246 for_primary_ifa(in_dev) { 1247 if (ifa->ifa_scope > scope) 1248 continue; 1249 if (!dst || inet_ifa_match(dst, ifa)) { 1250 addr = ifa->ifa_local; 1251 break; 1252 } 1253 if (!addr) 1254 addr = ifa->ifa_local; 1255 } endfor_ifa(in_dev); 1256 1257 if (addr) 1258 goto out_unlock; 1259 no_in_dev: 1260 master_idx = l3mdev_master_ifindex_rcu(dev); 1261 1262 /* For VRFs, the VRF device takes the place of the loopback device, 1263 * with addresses on it being preferred. Note in such cases the 1264 * loopback device will be among the devices that fail the master_idx 1265 * equality check in the loop below. 1266 */ 1267 if (master_idx && 1268 (dev = dev_get_by_index_rcu(net, master_idx)) && 1269 (in_dev = __in_dev_get_rcu(dev))) { 1270 addr = in_dev_select_addr(in_dev, scope); 1271 if (addr) 1272 goto out_unlock; 1273 } 1274 1275 /* Not loopback addresses on loopback should be preferred 1276 in this case. It is important that lo is the first interface 1277 in dev_base list. 1278 */ 1279 for_each_netdev_rcu(net, dev) { 1280 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1281 continue; 1282 1283 in_dev = __in_dev_get_rcu(dev); 1284 if (!in_dev) 1285 continue; 1286 1287 addr = in_dev_select_addr(in_dev, scope); 1288 if (addr) 1289 goto out_unlock; 1290 } 1291 out_unlock: 1292 rcu_read_unlock(); 1293 return addr; 1294 } 1295 EXPORT_SYMBOL(inet_select_addr); 1296 1297 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 1298 __be32 local, int scope) 1299 { 1300 int same = 0; 1301 __be32 addr = 0; 1302 1303 for_ifa(in_dev) { 1304 if (!addr && 1305 (local == ifa->ifa_local || !local) && 1306 ifa->ifa_scope <= scope) { 1307 addr = ifa->ifa_local; 1308 if (same) 1309 break; 1310 } 1311 if (!same) { 1312 same = (!local || inet_ifa_match(local, ifa)) && 1313 (!dst || inet_ifa_match(dst, ifa)); 1314 if (same && addr) { 1315 if (local || !dst) 1316 break; 1317 /* Is the selected addr into dst subnet? */ 1318 if (inet_ifa_match(addr, ifa)) 1319 break; 1320 /* No, then can we use new local src? */ 1321 if (ifa->ifa_scope <= scope) { 1322 addr = ifa->ifa_local; 1323 break; 1324 } 1325 /* search for large dst subnet for addr */ 1326 same = 0; 1327 } 1328 } 1329 } endfor_ifa(in_dev); 1330 1331 return same ? addr : 0; 1332 } 1333 1334 /* 1335 * Confirm that local IP address exists using wildcards: 1336 * - net: netns to check, cannot be NULL 1337 * - in_dev: only on this interface, NULL=any interface 1338 * - dst: only in the same subnet as dst, 0=any dst 1339 * - local: address, 0=autoselect the local address 1340 * - scope: maximum allowed scope value for the local address 1341 */ 1342 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, 1343 __be32 dst, __be32 local, int scope) 1344 { 1345 __be32 addr = 0; 1346 struct net_device *dev; 1347 1348 if (in_dev) 1349 return confirm_addr_indev(in_dev, dst, local, scope); 1350 1351 rcu_read_lock(); 1352 for_each_netdev_rcu(net, dev) { 1353 in_dev = __in_dev_get_rcu(dev); 1354 if (in_dev) { 1355 addr = confirm_addr_indev(in_dev, dst, local, scope); 1356 if (addr) 1357 break; 1358 } 1359 } 1360 rcu_read_unlock(); 1361 1362 return addr; 1363 } 1364 EXPORT_SYMBOL(inet_confirm_addr); 1365 1366 /* 1367 * Device notifier 1368 */ 1369 1370 int register_inetaddr_notifier(struct notifier_block *nb) 1371 { 1372 return blocking_notifier_chain_register(&inetaddr_chain, nb); 1373 } 1374 EXPORT_SYMBOL(register_inetaddr_notifier); 1375 1376 int unregister_inetaddr_notifier(struct notifier_block *nb) 1377 { 1378 return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 1379 } 1380 EXPORT_SYMBOL(unregister_inetaddr_notifier); 1381 1382 int register_inetaddr_validator_notifier(struct notifier_block *nb) 1383 { 1384 return blocking_notifier_chain_register(&inetaddr_validator_chain, nb); 1385 } 1386 EXPORT_SYMBOL(register_inetaddr_validator_notifier); 1387 1388 int unregister_inetaddr_validator_notifier(struct notifier_block *nb) 1389 { 1390 return blocking_notifier_chain_unregister(&inetaddr_validator_chain, 1391 nb); 1392 } 1393 EXPORT_SYMBOL(unregister_inetaddr_validator_notifier); 1394 1395 /* Rename ifa_labels for a device name change. Make some effort to preserve 1396 * existing alias numbering and to create unique labels if possible. 1397 */ 1398 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 1399 { 1400 struct in_ifaddr *ifa; 1401 int named = 0; 1402 1403 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1404 char old[IFNAMSIZ], *dot; 1405 1406 memcpy(old, ifa->ifa_label, IFNAMSIZ); 1407 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1408 if (named++ == 0) 1409 goto skip; 1410 dot = strchr(old, ':'); 1411 if (!dot) { 1412 sprintf(old, ":%d", named); 1413 dot = old; 1414 } 1415 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) 1416 strcat(ifa->ifa_label, dot); 1417 else 1418 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 1419 skip: 1420 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 1421 } 1422 } 1423 1424 static bool inetdev_valid_mtu(unsigned int mtu) 1425 { 1426 return mtu >= IPV4_MIN_MTU; 1427 } 1428 1429 static void inetdev_send_gratuitous_arp(struct net_device *dev, 1430 struct in_device *in_dev) 1431 1432 { 1433 struct in_ifaddr *ifa; 1434 1435 for (ifa = in_dev->ifa_list; ifa; 1436 ifa = ifa->ifa_next) { 1437 arp_send(ARPOP_REQUEST, ETH_P_ARP, 1438 ifa->ifa_local, dev, 1439 ifa->ifa_local, NULL, 1440 dev->dev_addr, NULL); 1441 } 1442 } 1443 1444 /* Called only under RTNL semaphore */ 1445 1446 static int inetdev_event(struct notifier_block *this, unsigned long event, 1447 void *ptr) 1448 { 1449 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1450 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1451 1452 ASSERT_RTNL(); 1453 1454 if (!in_dev) { 1455 if (event == NETDEV_REGISTER) { 1456 in_dev = inetdev_init(dev); 1457 if (IS_ERR(in_dev)) 1458 return notifier_from_errno(PTR_ERR(in_dev)); 1459 if (dev->flags & IFF_LOOPBACK) { 1460 IN_DEV_CONF_SET(in_dev, NOXFRM, 1); 1461 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); 1462 } 1463 } else if (event == NETDEV_CHANGEMTU) { 1464 /* Re-enabling IP */ 1465 if (inetdev_valid_mtu(dev->mtu)) 1466 in_dev = inetdev_init(dev); 1467 } 1468 goto out; 1469 } 1470 1471 switch (event) { 1472 case NETDEV_REGISTER: 1473 pr_debug("%s: bug\n", __func__); 1474 RCU_INIT_POINTER(dev->ip_ptr, NULL); 1475 break; 1476 case NETDEV_UP: 1477 if (!inetdev_valid_mtu(dev->mtu)) 1478 break; 1479 if (dev->flags & IFF_LOOPBACK) { 1480 struct in_ifaddr *ifa = inet_alloc_ifa(); 1481 1482 if (ifa) { 1483 INIT_HLIST_NODE(&ifa->hash); 1484 ifa->ifa_local = 1485 ifa->ifa_address = htonl(INADDR_LOOPBACK); 1486 ifa->ifa_prefixlen = 8; 1487 ifa->ifa_mask = inet_make_mask(8); 1488 in_dev_hold(in_dev); 1489 ifa->ifa_dev = in_dev; 1490 ifa->ifa_scope = RT_SCOPE_HOST; 1491 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1492 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, 1493 INFINITY_LIFE_TIME); 1494 ipv4_devconf_setall(in_dev); 1495 neigh_parms_data_state_setall(in_dev->arp_parms); 1496 inet_insert_ifa(ifa); 1497 } 1498 } 1499 ip_mc_up(in_dev); 1500 /* fall through */ 1501 case NETDEV_CHANGEADDR: 1502 if (!IN_DEV_ARP_NOTIFY(in_dev)) 1503 break; 1504 /* fall through */ 1505 case NETDEV_NOTIFY_PEERS: 1506 /* Send gratuitous ARP to notify of link change */ 1507 inetdev_send_gratuitous_arp(dev, in_dev); 1508 break; 1509 case NETDEV_DOWN: 1510 ip_mc_down(in_dev); 1511 break; 1512 case NETDEV_PRE_TYPE_CHANGE: 1513 ip_mc_unmap(in_dev); 1514 break; 1515 case NETDEV_POST_TYPE_CHANGE: 1516 ip_mc_remap(in_dev); 1517 break; 1518 case NETDEV_CHANGEMTU: 1519 if (inetdev_valid_mtu(dev->mtu)) 1520 break; 1521 /* disable IP when MTU is not enough */ 1522 /* fall through */ 1523 case NETDEV_UNREGISTER: 1524 inetdev_destroy(in_dev); 1525 break; 1526 case NETDEV_CHANGENAME: 1527 /* Do not notify about label change, this event is 1528 * not interesting to applications using netlink. 1529 */ 1530 inetdev_changename(dev, in_dev); 1531 1532 devinet_sysctl_unregister(in_dev); 1533 devinet_sysctl_register(in_dev); 1534 break; 1535 } 1536 out: 1537 return NOTIFY_DONE; 1538 } 1539 1540 static struct notifier_block ip_netdev_notifier = { 1541 .notifier_call = inetdev_event, 1542 }; 1543 1544 static size_t inet_nlmsg_size(void) 1545 { 1546 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1547 + nla_total_size(4) /* IFA_ADDRESS */ 1548 + nla_total_size(4) /* IFA_LOCAL */ 1549 + nla_total_size(4) /* IFA_BROADCAST */ 1550 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ 1551 + nla_total_size(4) /* IFA_FLAGS */ 1552 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */ 1553 } 1554 1555 static inline u32 cstamp_delta(unsigned long cstamp) 1556 { 1557 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 1558 } 1559 1560 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 1561 unsigned long tstamp, u32 preferred, u32 valid) 1562 { 1563 struct ifa_cacheinfo ci; 1564 1565 ci.cstamp = cstamp_delta(cstamp); 1566 ci.tstamp = cstamp_delta(tstamp); 1567 ci.ifa_prefered = preferred; 1568 ci.ifa_valid = valid; 1569 1570 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 1571 } 1572 1573 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1574 u32 portid, u32 seq, int event, unsigned int flags) 1575 { 1576 struct ifaddrmsg *ifm; 1577 struct nlmsghdr *nlh; 1578 u32 preferred, valid; 1579 1580 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); 1581 if (!nlh) 1582 return -EMSGSIZE; 1583 1584 ifm = nlmsg_data(nlh); 1585 ifm->ifa_family = AF_INET; 1586 ifm->ifa_prefixlen = ifa->ifa_prefixlen; 1587 ifm->ifa_flags = ifa->ifa_flags; 1588 ifm->ifa_scope = ifa->ifa_scope; 1589 ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 1590 1591 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { 1592 preferred = ifa->ifa_preferred_lft; 1593 valid = ifa->ifa_valid_lft; 1594 if (preferred != INFINITY_LIFE_TIME) { 1595 long tval = (jiffies - ifa->ifa_tstamp) / HZ; 1596 1597 if (preferred > tval) 1598 preferred -= tval; 1599 else 1600 preferred = 0; 1601 if (valid != INFINITY_LIFE_TIME) { 1602 if (valid > tval) 1603 valid -= tval; 1604 else 1605 valid = 0; 1606 } 1607 } 1608 } else { 1609 preferred = INFINITY_LIFE_TIME; 1610 valid = INFINITY_LIFE_TIME; 1611 } 1612 if ((ifa->ifa_address && 1613 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) || 1614 (ifa->ifa_local && 1615 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) || 1616 (ifa->ifa_broadcast && 1617 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || 1618 (ifa->ifa_label[0] && 1619 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || 1620 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) || 1621 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, 1622 preferred, valid)) 1623 goto nla_put_failure; 1624 1625 nlmsg_end(skb, nlh); 1626 return 0; 1627 1628 nla_put_failure: 1629 nlmsg_cancel(skb, nlh); 1630 return -EMSGSIZE; 1631 } 1632 1633 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1634 { 1635 struct net *net = sock_net(skb->sk); 1636 int h, s_h; 1637 int idx, s_idx; 1638 int ip_idx, s_ip_idx; 1639 struct net_device *dev; 1640 struct in_device *in_dev; 1641 struct in_ifaddr *ifa; 1642 struct hlist_head *head; 1643 1644 s_h = cb->args[0]; 1645 s_idx = idx = cb->args[1]; 1646 s_ip_idx = ip_idx = cb->args[2]; 1647 1648 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1649 idx = 0; 1650 head = &net->dev_index_head[h]; 1651 rcu_read_lock(); 1652 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1653 net->dev_base_seq; 1654 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1655 if (idx < s_idx) 1656 goto cont; 1657 if (h > s_h || idx > s_idx) 1658 s_ip_idx = 0; 1659 in_dev = __in_dev_get_rcu(dev); 1660 if (!in_dev) 1661 goto cont; 1662 1663 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 1664 ifa = ifa->ifa_next, ip_idx++) { 1665 if (ip_idx < s_ip_idx) 1666 continue; 1667 if (inet_fill_ifaddr(skb, ifa, 1668 NETLINK_CB(cb->skb).portid, 1669 cb->nlh->nlmsg_seq, 1670 RTM_NEWADDR, NLM_F_MULTI) < 0) { 1671 rcu_read_unlock(); 1672 goto done; 1673 } 1674 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1675 } 1676 cont: 1677 idx++; 1678 } 1679 rcu_read_unlock(); 1680 } 1681 1682 done: 1683 cb->args[0] = h; 1684 cb->args[1] = idx; 1685 cb->args[2] = ip_idx; 1686 1687 return skb->len; 1688 } 1689 1690 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, 1691 u32 portid) 1692 { 1693 struct sk_buff *skb; 1694 u32 seq = nlh ? nlh->nlmsg_seq : 0; 1695 int err = -ENOBUFS; 1696 struct net *net; 1697 1698 net = dev_net(ifa->ifa_dev->dev); 1699 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1700 if (!skb) 1701 goto errout; 1702 1703 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0); 1704 if (err < 0) { 1705 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1706 WARN_ON(err == -EMSGSIZE); 1707 kfree_skb(skb); 1708 goto errout; 1709 } 1710 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1711 return; 1712 errout: 1713 if (err < 0) 1714 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); 1715 } 1716 1717 static size_t inet_get_link_af_size(const struct net_device *dev, 1718 u32 ext_filter_mask) 1719 { 1720 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1721 1722 if (!in_dev) 1723 return 0; 1724 1725 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ 1726 } 1727 1728 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 1729 u32 ext_filter_mask) 1730 { 1731 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1732 struct nlattr *nla; 1733 int i; 1734 1735 if (!in_dev) 1736 return -ENODATA; 1737 1738 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); 1739 if (!nla) 1740 return -EMSGSIZE; 1741 1742 for (i = 0; i < IPV4_DEVCONF_MAX; i++) 1743 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; 1744 1745 return 0; 1746 } 1747 1748 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { 1749 [IFLA_INET_CONF] = { .type = NLA_NESTED }, 1750 }; 1751 1752 static int inet_validate_link_af(const struct net_device *dev, 1753 const struct nlattr *nla) 1754 { 1755 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1756 int err, rem; 1757 1758 if (dev && !__in_dev_get_rcu(dev)) 1759 return -EAFNOSUPPORT; 1760 1761 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy, NULL); 1762 if (err < 0) 1763 return err; 1764 1765 if (tb[IFLA_INET_CONF]) { 1766 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { 1767 int cfgid = nla_type(a); 1768 1769 if (nla_len(a) < 4) 1770 return -EINVAL; 1771 1772 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) 1773 return -EINVAL; 1774 } 1775 } 1776 1777 return 0; 1778 } 1779 1780 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) 1781 { 1782 struct in_device *in_dev = __in_dev_get_rcu(dev); 1783 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1784 int rem; 1785 1786 if (!in_dev) 1787 return -EAFNOSUPPORT; 1788 1789 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0) 1790 BUG(); 1791 1792 if (tb[IFLA_INET_CONF]) { 1793 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) 1794 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); 1795 } 1796 1797 return 0; 1798 } 1799 1800 static int inet_netconf_msgsize_devconf(int type) 1801 { 1802 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1803 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1804 bool all = false; 1805 1806 if (type == NETCONFA_ALL) 1807 all = true; 1808 1809 if (all || type == NETCONFA_FORWARDING) 1810 size += nla_total_size(4); 1811 if (all || type == NETCONFA_RP_FILTER) 1812 size += nla_total_size(4); 1813 if (all || type == NETCONFA_MC_FORWARDING) 1814 size += nla_total_size(4); 1815 if (all || type == NETCONFA_PROXY_NEIGH) 1816 size += nla_total_size(4); 1817 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 1818 size += nla_total_size(4); 1819 1820 return size; 1821 } 1822 1823 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 1824 struct ipv4_devconf *devconf, u32 portid, 1825 u32 seq, int event, unsigned int flags, 1826 int type) 1827 { 1828 struct nlmsghdr *nlh; 1829 struct netconfmsg *ncm; 1830 bool all = false; 1831 1832 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1833 flags); 1834 if (!nlh) 1835 return -EMSGSIZE; 1836 1837 if (type == NETCONFA_ALL) 1838 all = true; 1839 1840 ncm = nlmsg_data(nlh); 1841 ncm->ncm_family = AF_INET; 1842 1843 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 1844 goto nla_put_failure; 1845 1846 if (!devconf) 1847 goto out; 1848 1849 if ((all || type == NETCONFA_FORWARDING) && 1850 nla_put_s32(skb, NETCONFA_FORWARDING, 1851 IPV4_DEVCONF(*devconf, FORWARDING)) < 0) 1852 goto nla_put_failure; 1853 if ((all || type == NETCONFA_RP_FILTER) && 1854 nla_put_s32(skb, NETCONFA_RP_FILTER, 1855 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) 1856 goto nla_put_failure; 1857 if ((all || type == NETCONFA_MC_FORWARDING) && 1858 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 1859 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) 1860 goto nla_put_failure; 1861 if ((all || type == NETCONFA_PROXY_NEIGH) && 1862 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 1863 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0) 1864 goto nla_put_failure; 1865 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 1866 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 1867 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0) 1868 goto nla_put_failure; 1869 1870 out: 1871 nlmsg_end(skb, nlh); 1872 return 0; 1873 1874 nla_put_failure: 1875 nlmsg_cancel(skb, nlh); 1876 return -EMSGSIZE; 1877 } 1878 1879 void inet_netconf_notify_devconf(struct net *net, int event, int type, 1880 int ifindex, struct ipv4_devconf *devconf) 1881 { 1882 struct sk_buff *skb; 1883 int err = -ENOBUFS; 1884 1885 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL); 1886 if (!skb) 1887 goto errout; 1888 1889 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 1890 event, 0, type); 1891 if (err < 0) { 1892 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1893 WARN_ON(err == -EMSGSIZE); 1894 kfree_skb(skb); 1895 goto errout; 1896 } 1897 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL); 1898 return; 1899 errout: 1900 if (err < 0) 1901 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); 1902 } 1903 1904 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { 1905 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1906 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 1907 [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, 1908 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 1909 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 1910 }; 1911 1912 static int inet_netconf_get_devconf(struct sk_buff *in_skb, 1913 struct nlmsghdr *nlh, 1914 struct netlink_ext_ack *extack) 1915 { 1916 struct net *net = sock_net(in_skb->sk); 1917 struct nlattr *tb[NETCONFA_MAX+1]; 1918 struct netconfmsg *ncm; 1919 struct sk_buff *skb; 1920 struct ipv4_devconf *devconf; 1921 struct in_device *in_dev; 1922 struct net_device *dev; 1923 int ifindex; 1924 int err; 1925 1926 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 1927 devconf_ipv4_policy, extack); 1928 if (err < 0) 1929 goto errout; 1930 1931 err = -EINVAL; 1932 if (!tb[NETCONFA_IFINDEX]) 1933 goto errout; 1934 1935 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1936 switch (ifindex) { 1937 case NETCONFA_IFINDEX_ALL: 1938 devconf = net->ipv4.devconf_all; 1939 break; 1940 case NETCONFA_IFINDEX_DEFAULT: 1941 devconf = net->ipv4.devconf_dflt; 1942 break; 1943 default: 1944 dev = __dev_get_by_index(net, ifindex); 1945 if (!dev) 1946 goto errout; 1947 in_dev = __in_dev_get_rtnl(dev); 1948 if (!in_dev) 1949 goto errout; 1950 devconf = &in_dev->cnf; 1951 break; 1952 } 1953 1954 err = -ENOBUFS; 1955 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 1956 if (!skb) 1957 goto errout; 1958 1959 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 1960 NETLINK_CB(in_skb).portid, 1961 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1962 NETCONFA_ALL); 1963 if (err < 0) { 1964 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1965 WARN_ON(err == -EMSGSIZE); 1966 kfree_skb(skb); 1967 goto errout; 1968 } 1969 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1970 errout: 1971 return err; 1972 } 1973 1974 static int inet_netconf_dump_devconf(struct sk_buff *skb, 1975 struct netlink_callback *cb) 1976 { 1977 struct net *net = sock_net(skb->sk); 1978 int h, s_h; 1979 int idx, s_idx; 1980 struct net_device *dev; 1981 struct in_device *in_dev; 1982 struct hlist_head *head; 1983 1984 s_h = cb->args[0]; 1985 s_idx = idx = cb->args[1]; 1986 1987 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1988 idx = 0; 1989 head = &net->dev_index_head[h]; 1990 rcu_read_lock(); 1991 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1992 net->dev_base_seq; 1993 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1994 if (idx < s_idx) 1995 goto cont; 1996 in_dev = __in_dev_get_rcu(dev); 1997 if (!in_dev) 1998 goto cont; 1999 2000 if (inet_netconf_fill_devconf(skb, dev->ifindex, 2001 &in_dev->cnf, 2002 NETLINK_CB(cb->skb).portid, 2003 cb->nlh->nlmsg_seq, 2004 RTM_NEWNETCONF, 2005 NLM_F_MULTI, 2006 NETCONFA_ALL) < 0) { 2007 rcu_read_unlock(); 2008 goto done; 2009 } 2010 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 2011 cont: 2012 idx++; 2013 } 2014 rcu_read_unlock(); 2015 } 2016 if (h == NETDEV_HASHENTRIES) { 2017 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 2018 net->ipv4.devconf_all, 2019 NETLINK_CB(cb->skb).portid, 2020 cb->nlh->nlmsg_seq, 2021 RTM_NEWNETCONF, NLM_F_MULTI, 2022 NETCONFA_ALL) < 0) 2023 goto done; 2024 else 2025 h++; 2026 } 2027 if (h == NETDEV_HASHENTRIES + 1) { 2028 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 2029 net->ipv4.devconf_dflt, 2030 NETLINK_CB(cb->skb).portid, 2031 cb->nlh->nlmsg_seq, 2032 RTM_NEWNETCONF, NLM_F_MULTI, 2033 NETCONFA_ALL) < 0) 2034 goto done; 2035 else 2036 h++; 2037 } 2038 done: 2039 cb->args[0] = h; 2040 cb->args[1] = idx; 2041 2042 return skb->len; 2043 } 2044 2045 #ifdef CONFIG_SYSCTL 2046 2047 static void devinet_copy_dflt_conf(struct net *net, int i) 2048 { 2049 struct net_device *dev; 2050 2051 rcu_read_lock(); 2052 for_each_netdev_rcu(net, dev) { 2053 struct in_device *in_dev; 2054 2055 in_dev = __in_dev_get_rcu(dev); 2056 if (in_dev && !test_bit(i, in_dev->cnf.state)) 2057 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 2058 } 2059 rcu_read_unlock(); 2060 } 2061 2062 /* called with RTNL locked */ 2063 static void inet_forward_change(struct net *net) 2064 { 2065 struct net_device *dev; 2066 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 2067 2068 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 2069 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 2070 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2071 NETCONFA_FORWARDING, 2072 NETCONFA_IFINDEX_ALL, 2073 net->ipv4.devconf_all); 2074 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2075 NETCONFA_FORWARDING, 2076 NETCONFA_IFINDEX_DEFAULT, 2077 net->ipv4.devconf_dflt); 2078 2079 for_each_netdev(net, dev) { 2080 struct in_device *in_dev; 2081 2082 if (on) 2083 dev_disable_lro(dev); 2084 2085 in_dev = __in_dev_get_rtnl(dev); 2086 if (in_dev) { 2087 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 2088 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2089 NETCONFA_FORWARDING, 2090 dev->ifindex, &in_dev->cnf); 2091 } 2092 } 2093 } 2094 2095 static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf) 2096 { 2097 if (cnf == net->ipv4.devconf_dflt) 2098 return NETCONFA_IFINDEX_DEFAULT; 2099 else if (cnf == net->ipv4.devconf_all) 2100 return NETCONFA_IFINDEX_ALL; 2101 else { 2102 struct in_device *idev 2103 = container_of(cnf, struct in_device, cnf); 2104 return idev->dev->ifindex; 2105 } 2106 } 2107 2108 static int devinet_conf_proc(struct ctl_table *ctl, int write, 2109 void __user *buffer, 2110 size_t *lenp, loff_t *ppos) 2111 { 2112 int old_value = *(int *)ctl->data; 2113 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2114 int new_value = *(int *)ctl->data; 2115 2116 if (write) { 2117 struct ipv4_devconf *cnf = ctl->extra1; 2118 struct net *net = ctl->extra2; 2119 int i = (int *)ctl->data - cnf->data; 2120 int ifindex; 2121 2122 set_bit(i, cnf->state); 2123 2124 if (cnf == net->ipv4.devconf_dflt) 2125 devinet_copy_dflt_conf(net, i); 2126 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || 2127 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) 2128 if ((new_value == 0) && (old_value != 0)) 2129 rt_cache_flush(net); 2130 2131 if (i == IPV4_DEVCONF_RP_FILTER - 1 && 2132 new_value != old_value) { 2133 ifindex = devinet_conf_ifindex(net, cnf); 2134 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2135 NETCONFA_RP_FILTER, 2136 ifindex, cnf); 2137 } 2138 if (i == IPV4_DEVCONF_PROXY_ARP - 1 && 2139 new_value != old_value) { 2140 ifindex = devinet_conf_ifindex(net, cnf); 2141 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2142 NETCONFA_PROXY_NEIGH, 2143 ifindex, cnf); 2144 } 2145 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 && 2146 new_value != old_value) { 2147 ifindex = devinet_conf_ifindex(net, cnf); 2148 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2149 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 2150 ifindex, cnf); 2151 } 2152 } 2153 2154 return ret; 2155 } 2156 2157 static int devinet_sysctl_forward(struct ctl_table *ctl, int write, 2158 void __user *buffer, 2159 size_t *lenp, loff_t *ppos) 2160 { 2161 int *valp = ctl->data; 2162 int val = *valp; 2163 loff_t pos = *ppos; 2164 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2165 2166 if (write && *valp != val) { 2167 struct net *net = ctl->extra2; 2168 2169 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { 2170 if (!rtnl_trylock()) { 2171 /* Restore the original values before restarting */ 2172 *valp = val; 2173 *ppos = pos; 2174 return restart_syscall(); 2175 } 2176 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { 2177 inet_forward_change(net); 2178 } else { 2179 struct ipv4_devconf *cnf = ctl->extra1; 2180 struct in_device *idev = 2181 container_of(cnf, struct in_device, cnf); 2182 if (*valp) 2183 dev_disable_lro(idev->dev); 2184 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2185 NETCONFA_FORWARDING, 2186 idev->dev->ifindex, 2187 cnf); 2188 } 2189 rtnl_unlock(); 2190 rt_cache_flush(net); 2191 } else 2192 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2193 NETCONFA_FORWARDING, 2194 NETCONFA_IFINDEX_DEFAULT, 2195 net->ipv4.devconf_dflt); 2196 } 2197 2198 return ret; 2199 } 2200 2201 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write, 2202 void __user *buffer, 2203 size_t *lenp, loff_t *ppos) 2204 { 2205 int *valp = ctl->data; 2206 int val = *valp; 2207 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2208 struct net *net = ctl->extra2; 2209 2210 if (write && *valp != val) 2211 rt_cache_flush(net); 2212 2213 return ret; 2214 } 2215 2216 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ 2217 { \ 2218 .procname = name, \ 2219 .data = ipv4_devconf.data + \ 2220 IPV4_DEVCONF_ ## attr - 1, \ 2221 .maxlen = sizeof(int), \ 2222 .mode = mval, \ 2223 .proc_handler = proc, \ 2224 .extra1 = &ipv4_devconf, \ 2225 } 2226 2227 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 2228 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) 2229 2230 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 2231 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) 2232 2233 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ 2234 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) 2235 2236 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 2237 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) 2238 2239 static struct devinet_sysctl_table { 2240 struct ctl_table_header *sysctl_header; 2241 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; 2242 } devinet_sysctl = { 2243 .devinet_vars = { 2244 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 2245 devinet_sysctl_forward), 2246 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 2247 2248 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 2249 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 2250 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 2251 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 2252 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 2253 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 2254 "accept_source_route"), 2255 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), 2256 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), 2257 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 2258 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 2259 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 2260 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 2261 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 2262 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 2263 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 2264 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 2265 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 2266 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), 2267 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), 2268 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION, 2269 "force_igmp_version"), 2270 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL, 2271 "igmpv2_unsolicited_report_interval"), 2272 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL, 2273 "igmpv3_unsolicited_report_interval"), 2274 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN, 2275 "ignore_routes_with_linkdown"), 2276 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP, 2277 "drop_gratuitous_arp"), 2278 2279 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 2280 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 2281 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 2282 "promote_secondaries"), 2283 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, 2284 "route_localnet"), 2285 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST, 2286 "drop_unicast_in_l2_multicast"), 2287 }, 2288 }; 2289 2290 static int __devinet_sysctl_register(struct net *net, char *dev_name, 2291 int ifindex, struct ipv4_devconf *p) 2292 { 2293 int i; 2294 struct devinet_sysctl_table *t; 2295 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; 2296 2297 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 2298 if (!t) 2299 goto out; 2300 2301 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 2302 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 2303 t->devinet_vars[i].extra1 = p; 2304 t->devinet_vars[i].extra2 = net; 2305 } 2306 2307 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); 2308 2309 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); 2310 if (!t->sysctl_header) 2311 goto free; 2312 2313 p->sysctl = t; 2314 2315 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 2316 ifindex, p); 2317 return 0; 2318 2319 free: 2320 kfree(t); 2321 out: 2322 return -ENOBUFS; 2323 } 2324 2325 static void __devinet_sysctl_unregister(struct net *net, 2326 struct ipv4_devconf *cnf, int ifindex) 2327 { 2328 struct devinet_sysctl_table *t = cnf->sysctl; 2329 2330 if (t) { 2331 cnf->sysctl = NULL; 2332 unregister_net_sysctl_table(t->sysctl_header); 2333 kfree(t); 2334 } 2335 2336 inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 2337 } 2338 2339 static int devinet_sysctl_register(struct in_device *idev) 2340 { 2341 int err; 2342 2343 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 2344 return -EINVAL; 2345 2346 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL); 2347 if (err) 2348 return err; 2349 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, 2350 idev->dev->ifindex, &idev->cnf); 2351 if (err) 2352 neigh_sysctl_unregister(idev->arp_parms); 2353 return err; 2354 } 2355 2356 static void devinet_sysctl_unregister(struct in_device *idev) 2357 { 2358 struct net *net = dev_net(idev->dev); 2359 2360 __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex); 2361 neigh_sysctl_unregister(idev->arp_parms); 2362 } 2363 2364 static struct ctl_table ctl_forward_entry[] = { 2365 { 2366 .procname = "ip_forward", 2367 .data = &ipv4_devconf.data[ 2368 IPV4_DEVCONF_FORWARDING - 1], 2369 .maxlen = sizeof(int), 2370 .mode = 0644, 2371 .proc_handler = devinet_sysctl_forward, 2372 .extra1 = &ipv4_devconf, 2373 .extra2 = &init_net, 2374 }, 2375 { }, 2376 }; 2377 #endif 2378 2379 static __net_init int devinet_init_net(struct net *net) 2380 { 2381 int err; 2382 struct ipv4_devconf *all, *dflt; 2383 #ifdef CONFIG_SYSCTL 2384 struct ctl_table *tbl = ctl_forward_entry; 2385 struct ctl_table_header *forw_hdr; 2386 #endif 2387 2388 err = -ENOMEM; 2389 all = &ipv4_devconf; 2390 dflt = &ipv4_devconf_dflt; 2391 2392 if (!net_eq(net, &init_net)) { 2393 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); 2394 if (!all) 2395 goto err_alloc_all; 2396 2397 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 2398 if (!dflt) 2399 goto err_alloc_dflt; 2400 2401 #ifdef CONFIG_SYSCTL 2402 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); 2403 if (!tbl) 2404 goto err_alloc_ctl; 2405 2406 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; 2407 tbl[0].extra1 = all; 2408 tbl[0].extra2 = net; 2409 #endif 2410 } 2411 2412 #ifdef CONFIG_SYSCTL 2413 err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all); 2414 if (err < 0) 2415 goto err_reg_all; 2416 2417 err = __devinet_sysctl_register(net, "default", 2418 NETCONFA_IFINDEX_DEFAULT, dflt); 2419 if (err < 0) 2420 goto err_reg_dflt; 2421 2422 err = -ENOMEM; 2423 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); 2424 if (!forw_hdr) 2425 goto err_reg_ctl; 2426 net->ipv4.forw_hdr = forw_hdr; 2427 #endif 2428 2429 net->ipv4.devconf_all = all; 2430 net->ipv4.devconf_dflt = dflt; 2431 return 0; 2432 2433 #ifdef CONFIG_SYSCTL 2434 err_reg_ctl: 2435 __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT); 2436 err_reg_dflt: 2437 __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 2438 err_reg_all: 2439 if (tbl != ctl_forward_entry) 2440 kfree(tbl); 2441 err_alloc_ctl: 2442 #endif 2443 if (dflt != &ipv4_devconf_dflt) 2444 kfree(dflt); 2445 err_alloc_dflt: 2446 if (all != &ipv4_devconf) 2447 kfree(all); 2448 err_alloc_all: 2449 return err; 2450 } 2451 2452 static __net_exit void devinet_exit_net(struct net *net) 2453 { 2454 #ifdef CONFIG_SYSCTL 2455 struct ctl_table *tbl; 2456 2457 tbl = net->ipv4.forw_hdr->ctl_table_arg; 2458 unregister_net_sysctl_table(net->ipv4.forw_hdr); 2459 __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt, 2460 NETCONFA_IFINDEX_DEFAULT); 2461 __devinet_sysctl_unregister(net, net->ipv4.devconf_all, 2462 NETCONFA_IFINDEX_ALL); 2463 kfree(tbl); 2464 #endif 2465 kfree(net->ipv4.devconf_dflt); 2466 kfree(net->ipv4.devconf_all); 2467 } 2468 2469 static __net_initdata struct pernet_operations devinet_ops = { 2470 .init = devinet_init_net, 2471 .exit = devinet_exit_net, 2472 }; 2473 2474 static struct rtnl_af_ops inet_af_ops __read_mostly = { 2475 .family = AF_INET, 2476 .fill_link_af = inet_fill_link_af, 2477 .get_link_af_size = inet_get_link_af_size, 2478 .validate_link_af = inet_validate_link_af, 2479 .set_link_af = inet_set_link_af, 2480 }; 2481 2482 void __init devinet_init(void) 2483 { 2484 int i; 2485 2486 for (i = 0; i < IN4_ADDR_HSIZE; i++) 2487 INIT_HLIST_HEAD(&inet_addr_lst[i]); 2488 2489 register_pernet_subsys(&devinet_ops); 2490 2491 register_gifconf(PF_INET, inet_gifconf); 2492 register_netdevice_notifier(&ip_netdev_notifier); 2493 2494 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); 2495 2496 rtnl_af_register(&inet_af_ops); 2497 2498 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0); 2499 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0); 2500 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0); 2501 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, 2502 inet_netconf_dump_devconf, 0); 2503 } 2504