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 *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 = rtnl_dereference(in_dev->ifa_list); 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; 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->ifa_next); 440 rcu_assign_pointer(promote->ifa_next, last_sec); 441 rcu_assign_pointer(last_prim->ifa_next, 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 int err; 654 655 ASSERT_RTNL(); 656 657 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 658 ifa_ipv4_policy, extack); 659 if (err < 0) 660 goto errout; 661 662 ifm = nlmsg_data(nlh); 663 in_dev = inetdev_by_index(net, ifm->ifa_index); 664 if (!in_dev) { 665 err = -ENODEV; 666 goto errout; 667 } 668 669 for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL; 670 ifap = &ifa->ifa_next) { 671 if (tb[IFA_LOCAL] && 672 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL])) 673 continue; 674 675 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) 676 continue; 677 678 if (tb[IFA_ADDRESS] && 679 (ifm->ifa_prefixlen != ifa->ifa_prefixlen || 680 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa))) 681 continue; 682 683 if (ipv4_is_multicast(ifa->ifa_address)) 684 ip_mc_autojoin_config(net, false, ifa); 685 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); 686 return 0; 687 } 688 689 err = -EADDRNOTAVAIL; 690 errout: 691 return err; 692 } 693 694 #define INFINITY_LIFE_TIME 0xFFFFFFFF 695 696 static void check_lifetime(struct work_struct *work) 697 { 698 unsigned long now, next, next_sec, next_sched; 699 struct in_ifaddr *ifa; 700 struct hlist_node *n; 701 int i; 702 703 now = jiffies; 704 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 705 706 for (i = 0; i < IN4_ADDR_HSIZE; i++) { 707 bool change_needed = false; 708 709 rcu_read_lock(); 710 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) { 711 unsigned long age; 712 713 if (ifa->ifa_flags & IFA_F_PERMANENT) 714 continue; 715 716 /* We try to batch several events at once. */ 717 age = (now - ifa->ifa_tstamp + 718 ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 719 720 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && 721 age >= ifa->ifa_valid_lft) { 722 change_needed = true; 723 } else if (ifa->ifa_preferred_lft == 724 INFINITY_LIFE_TIME) { 725 continue; 726 } else if (age >= ifa->ifa_preferred_lft) { 727 if (time_before(ifa->ifa_tstamp + 728 ifa->ifa_valid_lft * HZ, next)) 729 next = ifa->ifa_tstamp + 730 ifa->ifa_valid_lft * HZ; 731 732 if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) 733 change_needed = true; 734 } else if (time_before(ifa->ifa_tstamp + 735 ifa->ifa_preferred_lft * HZ, 736 next)) { 737 next = ifa->ifa_tstamp + 738 ifa->ifa_preferred_lft * HZ; 739 } 740 } 741 rcu_read_unlock(); 742 if (!change_needed) 743 continue; 744 rtnl_lock(); 745 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) { 746 unsigned long age; 747 748 if (ifa->ifa_flags & IFA_F_PERMANENT) 749 continue; 750 751 /* We try to batch several events at once. */ 752 age = (now - ifa->ifa_tstamp + 753 ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 754 755 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && 756 age >= ifa->ifa_valid_lft) { 757 struct in_ifaddr __rcu **ifap; 758 struct in_ifaddr *tmp; 759 760 ifap = &ifa->ifa_dev->ifa_list; 761 tmp = rtnl_dereference(*ifap); 762 while (tmp) { 763 if (tmp == ifa) { 764 inet_del_ifa(ifa->ifa_dev, 765 ifap, 1); 766 break; 767 } 768 ifap = &tmp->ifa_next; 769 tmp = rtnl_dereference(*ifap); 770 } 771 } else if (ifa->ifa_preferred_lft != 772 INFINITY_LIFE_TIME && 773 age >= ifa->ifa_preferred_lft && 774 !(ifa->ifa_flags & IFA_F_DEPRECATED)) { 775 ifa->ifa_flags |= IFA_F_DEPRECATED; 776 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 777 } 778 } 779 rtnl_unlock(); 780 } 781 782 next_sec = round_jiffies_up(next); 783 next_sched = next; 784 785 /* If rounded timeout is accurate enough, accept it. */ 786 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 787 next_sched = next_sec; 788 789 now = jiffies; 790 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 791 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX)) 792 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX; 793 794 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 795 next_sched - now); 796 } 797 798 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, 799 __u32 prefered_lft) 800 { 801 unsigned long timeout; 802 803 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); 804 805 timeout = addrconf_timeout_fixup(valid_lft, HZ); 806 if (addrconf_finite_timeout(timeout)) 807 ifa->ifa_valid_lft = timeout; 808 else 809 ifa->ifa_flags |= IFA_F_PERMANENT; 810 811 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 812 if (addrconf_finite_timeout(timeout)) { 813 if (timeout == 0) 814 ifa->ifa_flags |= IFA_F_DEPRECATED; 815 ifa->ifa_preferred_lft = timeout; 816 } 817 ifa->ifa_tstamp = jiffies; 818 if (!ifa->ifa_cstamp) 819 ifa->ifa_cstamp = ifa->ifa_tstamp; 820 } 821 822 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, 823 __u32 *pvalid_lft, __u32 *pprefered_lft, 824 struct netlink_ext_ack *extack) 825 { 826 struct nlattr *tb[IFA_MAX+1]; 827 struct in_ifaddr *ifa; 828 struct ifaddrmsg *ifm; 829 struct net_device *dev; 830 struct in_device *in_dev; 831 int err; 832 833 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 834 ifa_ipv4_policy, extack); 835 if (err < 0) 836 goto errout; 837 838 ifm = nlmsg_data(nlh); 839 err = -EINVAL; 840 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL]) 841 goto errout; 842 843 dev = __dev_get_by_index(net, ifm->ifa_index); 844 err = -ENODEV; 845 if (!dev) 846 goto errout; 847 848 in_dev = __in_dev_get_rtnl(dev); 849 err = -ENOBUFS; 850 if (!in_dev) 851 goto errout; 852 853 ifa = inet_alloc_ifa(); 854 if (!ifa) 855 /* 856 * A potential indev allocation can be left alive, it stays 857 * assigned to its device and is destroy with it. 858 */ 859 goto errout; 860 861 ipv4_devconf_setall(in_dev); 862 neigh_parms_data_state_setall(in_dev->arp_parms); 863 in_dev_hold(in_dev); 864 865 if (!tb[IFA_ADDRESS]) 866 tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 867 868 INIT_HLIST_NODE(&ifa->hash); 869 ifa->ifa_prefixlen = ifm->ifa_prefixlen; 870 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 871 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : 872 ifm->ifa_flags; 873 ifa->ifa_scope = ifm->ifa_scope; 874 ifa->ifa_dev = in_dev; 875 876 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]); 877 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]); 878 879 if (tb[IFA_BROADCAST]) 880 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]); 881 882 if (tb[IFA_LABEL]) 883 nla_strscpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 884 else 885 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 886 887 if (tb[IFA_RT_PRIORITY]) 888 ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 889 890 if (tb[IFA_CACHEINFO]) { 891 struct ifa_cacheinfo *ci; 892 893 ci = nla_data(tb[IFA_CACHEINFO]); 894 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { 895 err = -EINVAL; 896 goto errout_free; 897 } 898 *pvalid_lft = ci->ifa_valid; 899 *pprefered_lft = ci->ifa_prefered; 900 } 901 902 return ifa; 903 904 errout_free: 905 inet_free_ifa(ifa); 906 errout: 907 return ERR_PTR(err); 908 } 909 910 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) 911 { 912 struct in_device *in_dev = ifa->ifa_dev; 913 struct in_ifaddr *ifa1; 914 915 if (!ifa->ifa_local) 916 return NULL; 917 918 in_dev_for_each_ifa_rtnl(ifa1, in_dev) { 919 if (ifa1->ifa_mask == ifa->ifa_mask && 920 inet_ifa_match(ifa1->ifa_address, ifa) && 921 ifa1->ifa_local == ifa->ifa_local) 922 return ifa1; 923 } 924 return NULL; 925 } 926 927 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 928 struct netlink_ext_ack *extack) 929 { 930 struct net *net = sock_net(skb->sk); 931 struct in_ifaddr *ifa; 932 struct in_ifaddr *ifa_existing; 933 __u32 valid_lft = INFINITY_LIFE_TIME; 934 __u32 prefered_lft = INFINITY_LIFE_TIME; 935 936 ASSERT_RTNL(); 937 938 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack); 939 if (IS_ERR(ifa)) 940 return PTR_ERR(ifa); 941 942 ifa_existing = find_matching_ifa(ifa); 943 if (!ifa_existing) { 944 /* It would be best to check for !NLM_F_CREATE here but 945 * userspace already relies on not having to provide this. 946 */ 947 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 948 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) { 949 int ret = ip_mc_autojoin_config(net, true, ifa); 950 951 if (ret < 0) { 952 inet_free_ifa(ifa); 953 return ret; 954 } 955 } 956 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid, 957 extack); 958 } else { 959 u32 new_metric = ifa->ifa_rt_priority; 960 961 inet_free_ifa(ifa); 962 963 if (nlh->nlmsg_flags & NLM_F_EXCL || 964 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 965 return -EEXIST; 966 ifa = ifa_existing; 967 968 if (ifa->ifa_rt_priority != new_metric) { 969 fib_modify_prefix_metric(ifa, new_metric); 970 ifa->ifa_rt_priority = new_metric; 971 } 972 973 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 974 cancel_delayed_work(&check_lifetime_work); 975 queue_delayed_work(system_power_efficient_wq, 976 &check_lifetime_work, 0); 977 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); 978 } 979 return 0; 980 } 981 982 /* 983 * Determine a default network mask, based on the IP address. 984 */ 985 986 static int inet_abc_len(__be32 addr) 987 { 988 int rc = -1; /* Something else, probably a multicast. */ 989 990 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) 991 rc = 0; 992 else { 993 __u32 haddr = ntohl(addr); 994 if (IN_CLASSA(haddr)) 995 rc = 8; 996 else if (IN_CLASSB(haddr)) 997 rc = 16; 998 else if (IN_CLASSC(haddr)) 999 rc = 24; 1000 else if (IN_CLASSE(haddr)) 1001 rc = 32; 1002 } 1003 1004 return rc; 1005 } 1006 1007 1008 int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr) 1009 { 1010 struct sockaddr_in sin_orig; 1011 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr; 1012 struct in_ifaddr __rcu **ifap = NULL; 1013 struct in_device *in_dev; 1014 struct in_ifaddr *ifa = NULL; 1015 struct net_device *dev; 1016 char *colon; 1017 int ret = -EFAULT; 1018 int tryaddrmatch = 0; 1019 1020 ifr->ifr_name[IFNAMSIZ - 1] = 0; 1021 1022 /* save original address for comparison */ 1023 memcpy(&sin_orig, sin, sizeof(*sin)); 1024 1025 colon = strchr(ifr->ifr_name, ':'); 1026 if (colon) 1027 *colon = 0; 1028 1029 dev_load(net, ifr->ifr_name); 1030 1031 switch (cmd) { 1032 case SIOCGIFADDR: /* Get interface address */ 1033 case SIOCGIFBRDADDR: /* Get the broadcast address */ 1034 case SIOCGIFDSTADDR: /* Get the destination address */ 1035 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 1036 /* Note that these ioctls will not sleep, 1037 so that we do not impose a lock. 1038 One day we will be forced to put shlock here (I mean SMP) 1039 */ 1040 tryaddrmatch = (sin_orig.sin_family == AF_INET); 1041 memset(sin, 0, sizeof(*sin)); 1042 sin->sin_family = AF_INET; 1043 break; 1044 1045 case SIOCSIFFLAGS: 1046 ret = -EPERM; 1047 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1048 goto out; 1049 break; 1050 case SIOCSIFADDR: /* Set interface address (and family) */ 1051 case SIOCSIFBRDADDR: /* Set the broadcast address */ 1052 case SIOCSIFDSTADDR: /* Set the destination address */ 1053 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 1054 ret = -EPERM; 1055 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1056 goto out; 1057 ret = -EINVAL; 1058 if (sin->sin_family != AF_INET) 1059 goto out; 1060 break; 1061 default: 1062 ret = -EINVAL; 1063 goto out; 1064 } 1065 1066 rtnl_lock(); 1067 1068 ret = -ENODEV; 1069 dev = __dev_get_by_name(net, ifr->ifr_name); 1070 if (!dev) 1071 goto done; 1072 1073 if (colon) 1074 *colon = ':'; 1075 1076 in_dev = __in_dev_get_rtnl(dev); 1077 if (in_dev) { 1078 if (tryaddrmatch) { 1079 /* Matthias Andree */ 1080 /* compare label and address (4.4BSD style) */ 1081 /* note: we only do this for a limited set of ioctls 1082 and only if the original address family was AF_INET. 1083 This is checked above. */ 1084 1085 for (ifap = &in_dev->ifa_list; 1086 (ifa = rtnl_dereference(*ifap)) != NULL; 1087 ifap = &ifa->ifa_next) { 1088 if (!strcmp(ifr->ifr_name, ifa->ifa_label) && 1089 sin_orig.sin_addr.s_addr == 1090 ifa->ifa_local) { 1091 break; /* found */ 1092 } 1093 } 1094 } 1095 /* we didn't get a match, maybe the application is 1096 4.3BSD-style and passed in junk so we fall back to 1097 comparing just the label */ 1098 if (!ifa) { 1099 for (ifap = &in_dev->ifa_list; 1100 (ifa = rtnl_dereference(*ifap)) != NULL; 1101 ifap = &ifa->ifa_next) 1102 if (!strcmp(ifr->ifr_name, ifa->ifa_label)) 1103 break; 1104 } 1105 } 1106 1107 ret = -EADDRNOTAVAIL; 1108 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 1109 goto done; 1110 1111 switch (cmd) { 1112 case SIOCGIFADDR: /* Get interface address */ 1113 ret = 0; 1114 sin->sin_addr.s_addr = ifa->ifa_local; 1115 break; 1116 1117 case SIOCGIFBRDADDR: /* Get the broadcast address */ 1118 ret = 0; 1119 sin->sin_addr.s_addr = ifa->ifa_broadcast; 1120 break; 1121 1122 case SIOCGIFDSTADDR: /* Get the destination address */ 1123 ret = 0; 1124 sin->sin_addr.s_addr = ifa->ifa_address; 1125 break; 1126 1127 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 1128 ret = 0; 1129 sin->sin_addr.s_addr = ifa->ifa_mask; 1130 break; 1131 1132 case SIOCSIFFLAGS: 1133 if (colon) { 1134 ret = -EADDRNOTAVAIL; 1135 if (!ifa) 1136 break; 1137 ret = 0; 1138 if (!(ifr->ifr_flags & IFF_UP)) 1139 inet_del_ifa(in_dev, ifap, 1); 1140 break; 1141 } 1142 ret = dev_change_flags(dev, ifr->ifr_flags, NULL); 1143 break; 1144 1145 case SIOCSIFADDR: /* Set interface address (and family) */ 1146 ret = -EINVAL; 1147 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1148 break; 1149 1150 if (!ifa) { 1151 ret = -ENOBUFS; 1152 ifa = inet_alloc_ifa(); 1153 if (!ifa) 1154 break; 1155 INIT_HLIST_NODE(&ifa->hash); 1156 if (colon) 1157 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ); 1158 else 1159 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1160 } else { 1161 ret = 0; 1162 if (ifa->ifa_local == sin->sin_addr.s_addr) 1163 break; 1164 inet_del_ifa(in_dev, ifap, 0); 1165 ifa->ifa_broadcast = 0; 1166 ifa->ifa_scope = 0; 1167 } 1168 1169 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 1170 1171 if (!(dev->flags & IFF_POINTOPOINT)) { 1172 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 1173 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 1174 if ((dev->flags & IFF_BROADCAST) && 1175 ifa->ifa_prefixlen < 31) 1176 ifa->ifa_broadcast = ifa->ifa_address | 1177 ~ifa->ifa_mask; 1178 } else { 1179 ifa->ifa_prefixlen = 32; 1180 ifa->ifa_mask = inet_make_mask(32); 1181 } 1182 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 1183 ret = inet_set_ifa(dev, ifa); 1184 break; 1185 1186 case SIOCSIFBRDADDR: /* Set the broadcast address */ 1187 ret = 0; 1188 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 1189 inet_del_ifa(in_dev, ifap, 0); 1190 ifa->ifa_broadcast = sin->sin_addr.s_addr; 1191 inet_insert_ifa(ifa); 1192 } 1193 break; 1194 1195 case SIOCSIFDSTADDR: /* Set the destination address */ 1196 ret = 0; 1197 if (ifa->ifa_address == sin->sin_addr.s_addr) 1198 break; 1199 ret = -EINVAL; 1200 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1201 break; 1202 ret = 0; 1203 inet_del_ifa(in_dev, ifap, 0); 1204 ifa->ifa_address = sin->sin_addr.s_addr; 1205 inet_insert_ifa(ifa); 1206 break; 1207 1208 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 1209 1210 /* 1211 * The mask we set must be legal. 1212 */ 1213 ret = -EINVAL; 1214 if (bad_mask(sin->sin_addr.s_addr, 0)) 1215 break; 1216 ret = 0; 1217 if (ifa->ifa_mask != sin->sin_addr.s_addr) { 1218 __be32 old_mask = ifa->ifa_mask; 1219 inet_del_ifa(in_dev, ifap, 0); 1220 ifa->ifa_mask = sin->sin_addr.s_addr; 1221 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 1222 1223 /* See if current broadcast address matches 1224 * with current netmask, then recalculate 1225 * the broadcast address. Otherwise it's a 1226 * funny address, so don't touch it since 1227 * the user seems to know what (s)he's doing... 1228 */ 1229 if ((dev->flags & IFF_BROADCAST) && 1230 (ifa->ifa_prefixlen < 31) && 1231 (ifa->ifa_broadcast == 1232 (ifa->ifa_local|~old_mask))) { 1233 ifa->ifa_broadcast = (ifa->ifa_local | 1234 ~sin->sin_addr.s_addr); 1235 } 1236 inet_insert_ifa(ifa); 1237 } 1238 break; 1239 } 1240 done: 1241 rtnl_unlock(); 1242 out: 1243 return ret; 1244 } 1245 1246 static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size) 1247 { 1248 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1249 const struct in_ifaddr *ifa; 1250 struct ifreq ifr; 1251 int done = 0; 1252 1253 if (WARN_ON(size > sizeof(struct ifreq))) 1254 goto out; 1255 1256 if (!in_dev) 1257 goto out; 1258 1259 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 1260 if (!buf) { 1261 done += size; 1262 continue; 1263 } 1264 if (len < size) 1265 break; 1266 memset(&ifr, 0, sizeof(struct ifreq)); 1267 strcpy(ifr.ifr_name, ifa->ifa_label); 1268 1269 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 1270 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 1271 ifa->ifa_local; 1272 1273 if (copy_to_user(buf + done, &ifr, size)) { 1274 done = -EFAULT; 1275 break; 1276 } 1277 len -= size; 1278 done += size; 1279 } 1280 out: 1281 return done; 1282 } 1283 1284 static __be32 in_dev_select_addr(const struct in_device *in_dev, 1285 int scope) 1286 { 1287 const struct in_ifaddr *ifa; 1288 1289 in_dev_for_each_ifa_rcu(ifa, in_dev) { 1290 if (ifa->ifa_flags & IFA_F_SECONDARY) 1291 continue; 1292 if (ifa->ifa_scope != RT_SCOPE_LINK && 1293 ifa->ifa_scope <= scope) 1294 return ifa->ifa_local; 1295 } 1296 1297 return 0; 1298 } 1299 1300 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 1301 { 1302 const struct in_ifaddr *ifa; 1303 __be32 addr = 0; 1304 unsigned char localnet_scope = RT_SCOPE_HOST; 1305 struct in_device *in_dev; 1306 struct net *net = dev_net(dev); 1307 int master_idx; 1308 1309 rcu_read_lock(); 1310 in_dev = __in_dev_get_rcu(dev); 1311 if (!in_dev) 1312 goto no_in_dev; 1313 1314 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev))) 1315 localnet_scope = RT_SCOPE_LINK; 1316 1317 in_dev_for_each_ifa_rcu(ifa, in_dev) { 1318 if (ifa->ifa_flags & IFA_F_SECONDARY) 1319 continue; 1320 if (min(ifa->ifa_scope, localnet_scope) > scope) 1321 continue; 1322 if (!dst || inet_ifa_match(dst, ifa)) { 1323 addr = ifa->ifa_local; 1324 break; 1325 } 1326 if (!addr) 1327 addr = ifa->ifa_local; 1328 } 1329 1330 if (addr) 1331 goto out_unlock; 1332 no_in_dev: 1333 master_idx = l3mdev_master_ifindex_rcu(dev); 1334 1335 /* For VRFs, the VRF device takes the place of the loopback device, 1336 * with addresses on it being preferred. Note in such cases the 1337 * loopback device will be among the devices that fail the master_idx 1338 * equality check in the loop below. 1339 */ 1340 if (master_idx && 1341 (dev = dev_get_by_index_rcu(net, master_idx)) && 1342 (in_dev = __in_dev_get_rcu(dev))) { 1343 addr = in_dev_select_addr(in_dev, scope); 1344 if (addr) 1345 goto out_unlock; 1346 } 1347 1348 /* Not loopback addresses on loopback should be preferred 1349 in this case. It is important that lo is the first interface 1350 in dev_base list. 1351 */ 1352 for_each_netdev_rcu(net, dev) { 1353 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1354 continue; 1355 1356 in_dev = __in_dev_get_rcu(dev); 1357 if (!in_dev) 1358 continue; 1359 1360 addr = in_dev_select_addr(in_dev, scope); 1361 if (addr) 1362 goto out_unlock; 1363 } 1364 out_unlock: 1365 rcu_read_unlock(); 1366 return addr; 1367 } 1368 EXPORT_SYMBOL(inet_select_addr); 1369 1370 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 1371 __be32 local, int scope) 1372 { 1373 unsigned char localnet_scope = RT_SCOPE_HOST; 1374 const struct in_ifaddr *ifa; 1375 __be32 addr = 0; 1376 int same = 0; 1377 1378 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev))) 1379 localnet_scope = RT_SCOPE_LINK; 1380 1381 in_dev_for_each_ifa_rcu(ifa, in_dev) { 1382 unsigned char min_scope = min(ifa->ifa_scope, localnet_scope); 1383 1384 if (!addr && 1385 (local == ifa->ifa_local || !local) && 1386 min_scope <= scope) { 1387 addr = ifa->ifa_local; 1388 if (same) 1389 break; 1390 } 1391 if (!same) { 1392 same = (!local || inet_ifa_match(local, ifa)) && 1393 (!dst || inet_ifa_match(dst, ifa)); 1394 if (same && addr) { 1395 if (local || !dst) 1396 break; 1397 /* Is the selected addr into dst subnet? */ 1398 if (inet_ifa_match(addr, ifa)) 1399 break; 1400 /* No, then can we use new local src? */ 1401 if (min_scope <= scope) { 1402 addr = ifa->ifa_local; 1403 break; 1404 } 1405 /* search for large dst subnet for addr */ 1406 same = 0; 1407 } 1408 } 1409 } 1410 1411 return same ? addr : 0; 1412 } 1413 1414 /* 1415 * Confirm that local IP address exists using wildcards: 1416 * - net: netns to check, cannot be NULL 1417 * - in_dev: only on this interface, NULL=any interface 1418 * - dst: only in the same subnet as dst, 0=any dst 1419 * - local: address, 0=autoselect the local address 1420 * - scope: maximum allowed scope value for the local address 1421 */ 1422 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, 1423 __be32 dst, __be32 local, int scope) 1424 { 1425 __be32 addr = 0; 1426 struct net_device *dev; 1427 1428 if (in_dev) 1429 return confirm_addr_indev(in_dev, dst, local, scope); 1430 1431 rcu_read_lock(); 1432 for_each_netdev_rcu(net, dev) { 1433 in_dev = __in_dev_get_rcu(dev); 1434 if (in_dev) { 1435 addr = confirm_addr_indev(in_dev, dst, local, scope); 1436 if (addr) 1437 break; 1438 } 1439 } 1440 rcu_read_unlock(); 1441 1442 return addr; 1443 } 1444 EXPORT_SYMBOL(inet_confirm_addr); 1445 1446 /* 1447 * Device notifier 1448 */ 1449 1450 int register_inetaddr_notifier(struct notifier_block *nb) 1451 { 1452 return blocking_notifier_chain_register(&inetaddr_chain, nb); 1453 } 1454 EXPORT_SYMBOL(register_inetaddr_notifier); 1455 1456 int unregister_inetaddr_notifier(struct notifier_block *nb) 1457 { 1458 return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 1459 } 1460 EXPORT_SYMBOL(unregister_inetaddr_notifier); 1461 1462 int register_inetaddr_validator_notifier(struct notifier_block *nb) 1463 { 1464 return blocking_notifier_chain_register(&inetaddr_validator_chain, nb); 1465 } 1466 EXPORT_SYMBOL(register_inetaddr_validator_notifier); 1467 1468 int unregister_inetaddr_validator_notifier(struct notifier_block *nb) 1469 { 1470 return blocking_notifier_chain_unregister(&inetaddr_validator_chain, 1471 nb); 1472 } 1473 EXPORT_SYMBOL(unregister_inetaddr_validator_notifier); 1474 1475 /* Rename ifa_labels for a device name change. Make some effort to preserve 1476 * existing alias numbering and to create unique labels if possible. 1477 */ 1478 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 1479 { 1480 struct in_ifaddr *ifa; 1481 int named = 0; 1482 1483 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 1484 char old[IFNAMSIZ], *dot; 1485 1486 memcpy(old, ifa->ifa_label, IFNAMSIZ); 1487 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1488 if (named++ == 0) 1489 goto skip; 1490 dot = strchr(old, ':'); 1491 if (!dot) { 1492 sprintf(old, ":%d", named); 1493 dot = old; 1494 } 1495 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) 1496 strcat(ifa->ifa_label, dot); 1497 else 1498 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 1499 skip: 1500 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 1501 } 1502 } 1503 1504 static void inetdev_send_gratuitous_arp(struct net_device *dev, 1505 struct in_device *in_dev) 1506 1507 { 1508 const struct in_ifaddr *ifa; 1509 1510 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 1511 arp_send(ARPOP_REQUEST, ETH_P_ARP, 1512 ifa->ifa_local, dev, 1513 ifa->ifa_local, NULL, 1514 dev->dev_addr, NULL); 1515 } 1516 } 1517 1518 /* Called only under RTNL semaphore */ 1519 1520 static int inetdev_event(struct notifier_block *this, unsigned long event, 1521 void *ptr) 1522 { 1523 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1524 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1525 1526 ASSERT_RTNL(); 1527 1528 if (!in_dev) { 1529 if (event == NETDEV_REGISTER) { 1530 in_dev = inetdev_init(dev); 1531 if (IS_ERR(in_dev)) 1532 return notifier_from_errno(PTR_ERR(in_dev)); 1533 if (dev->flags & IFF_LOOPBACK) { 1534 IN_DEV_CONF_SET(in_dev, NOXFRM, 1); 1535 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); 1536 } 1537 } else if (event == NETDEV_CHANGEMTU) { 1538 /* Re-enabling IP */ 1539 if (inetdev_valid_mtu(dev->mtu)) 1540 in_dev = inetdev_init(dev); 1541 } 1542 goto out; 1543 } 1544 1545 switch (event) { 1546 case NETDEV_REGISTER: 1547 pr_debug("%s: bug\n", __func__); 1548 RCU_INIT_POINTER(dev->ip_ptr, NULL); 1549 break; 1550 case NETDEV_UP: 1551 if (!inetdev_valid_mtu(dev->mtu)) 1552 break; 1553 if (dev->flags & IFF_LOOPBACK) { 1554 struct in_ifaddr *ifa = inet_alloc_ifa(); 1555 1556 if (ifa) { 1557 INIT_HLIST_NODE(&ifa->hash); 1558 ifa->ifa_local = 1559 ifa->ifa_address = htonl(INADDR_LOOPBACK); 1560 ifa->ifa_prefixlen = 8; 1561 ifa->ifa_mask = inet_make_mask(8); 1562 in_dev_hold(in_dev); 1563 ifa->ifa_dev = in_dev; 1564 ifa->ifa_scope = RT_SCOPE_HOST; 1565 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1566 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, 1567 INFINITY_LIFE_TIME); 1568 ipv4_devconf_setall(in_dev); 1569 neigh_parms_data_state_setall(in_dev->arp_parms); 1570 inet_insert_ifa(ifa); 1571 } 1572 } 1573 ip_mc_up(in_dev); 1574 fallthrough; 1575 case NETDEV_CHANGEADDR: 1576 if (!IN_DEV_ARP_NOTIFY(in_dev)) 1577 break; 1578 fallthrough; 1579 case NETDEV_NOTIFY_PEERS: 1580 /* Send gratuitous ARP to notify of link change */ 1581 inetdev_send_gratuitous_arp(dev, in_dev); 1582 break; 1583 case NETDEV_DOWN: 1584 ip_mc_down(in_dev); 1585 break; 1586 case NETDEV_PRE_TYPE_CHANGE: 1587 ip_mc_unmap(in_dev); 1588 break; 1589 case NETDEV_POST_TYPE_CHANGE: 1590 ip_mc_remap(in_dev); 1591 break; 1592 case NETDEV_CHANGEMTU: 1593 if (inetdev_valid_mtu(dev->mtu)) 1594 break; 1595 /* disable IP when MTU is not enough */ 1596 fallthrough; 1597 case NETDEV_UNREGISTER: 1598 inetdev_destroy(in_dev); 1599 break; 1600 case NETDEV_CHANGENAME: 1601 /* Do not notify about label change, this event is 1602 * not interesting to applications using netlink. 1603 */ 1604 inetdev_changename(dev, in_dev); 1605 1606 devinet_sysctl_unregister(in_dev); 1607 devinet_sysctl_register(in_dev); 1608 break; 1609 } 1610 out: 1611 return NOTIFY_DONE; 1612 } 1613 1614 static struct notifier_block ip_netdev_notifier = { 1615 .notifier_call = inetdev_event, 1616 }; 1617 1618 static size_t inet_nlmsg_size(void) 1619 { 1620 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1621 + nla_total_size(4) /* IFA_ADDRESS */ 1622 + nla_total_size(4) /* IFA_LOCAL */ 1623 + nla_total_size(4) /* IFA_BROADCAST */ 1624 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ 1625 + nla_total_size(4) /* IFA_FLAGS */ 1626 + nla_total_size(4) /* IFA_RT_PRIORITY */ 1627 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */ 1628 } 1629 1630 static inline u32 cstamp_delta(unsigned long cstamp) 1631 { 1632 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 1633 } 1634 1635 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 1636 unsigned long tstamp, u32 preferred, u32 valid) 1637 { 1638 struct ifa_cacheinfo ci; 1639 1640 ci.cstamp = cstamp_delta(cstamp); 1641 ci.tstamp = cstamp_delta(tstamp); 1642 ci.ifa_prefered = preferred; 1643 ci.ifa_valid = valid; 1644 1645 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 1646 } 1647 1648 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1649 struct inet_fill_args *args) 1650 { 1651 struct ifaddrmsg *ifm; 1652 struct nlmsghdr *nlh; 1653 u32 preferred, valid; 1654 1655 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm), 1656 args->flags); 1657 if (!nlh) 1658 return -EMSGSIZE; 1659 1660 ifm = nlmsg_data(nlh); 1661 ifm->ifa_family = AF_INET; 1662 ifm->ifa_prefixlen = ifa->ifa_prefixlen; 1663 ifm->ifa_flags = ifa->ifa_flags; 1664 ifm->ifa_scope = ifa->ifa_scope; 1665 ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 1666 1667 if (args->netnsid >= 0 && 1668 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 1669 goto nla_put_failure; 1670 1671 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { 1672 preferred = ifa->ifa_preferred_lft; 1673 valid = ifa->ifa_valid_lft; 1674 if (preferred != INFINITY_LIFE_TIME) { 1675 long tval = (jiffies - ifa->ifa_tstamp) / HZ; 1676 1677 if (preferred > tval) 1678 preferred -= tval; 1679 else 1680 preferred = 0; 1681 if (valid != INFINITY_LIFE_TIME) { 1682 if (valid > tval) 1683 valid -= tval; 1684 else 1685 valid = 0; 1686 } 1687 } 1688 } else { 1689 preferred = INFINITY_LIFE_TIME; 1690 valid = INFINITY_LIFE_TIME; 1691 } 1692 if ((ifa->ifa_address && 1693 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) || 1694 (ifa->ifa_local && 1695 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) || 1696 (ifa->ifa_broadcast && 1697 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || 1698 (ifa->ifa_label[0] && 1699 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || 1700 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) || 1701 (ifa->ifa_rt_priority && 1702 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) || 1703 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, 1704 preferred, valid)) 1705 goto nla_put_failure; 1706 1707 nlmsg_end(skb, nlh); 1708 return 0; 1709 1710 nla_put_failure: 1711 nlmsg_cancel(skb, nlh); 1712 return -EMSGSIZE; 1713 } 1714 1715 static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 1716 struct inet_fill_args *fillargs, 1717 struct net **tgt_net, struct sock *sk, 1718 struct netlink_callback *cb) 1719 { 1720 struct netlink_ext_ack *extack = cb->extack; 1721 struct nlattr *tb[IFA_MAX+1]; 1722 struct ifaddrmsg *ifm; 1723 int err, i; 1724 1725 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 1726 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request"); 1727 return -EINVAL; 1728 } 1729 1730 ifm = nlmsg_data(nlh); 1731 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 1732 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request"); 1733 return -EINVAL; 1734 } 1735 1736 fillargs->ifindex = ifm->ifa_index; 1737 if (fillargs->ifindex) { 1738 cb->answer_flags |= NLM_F_DUMP_FILTERED; 1739 fillargs->flags |= NLM_F_DUMP_FILTERED; 1740 } 1741 1742 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 1743 ifa_ipv4_policy, extack); 1744 if (err < 0) 1745 return err; 1746 1747 for (i = 0; i <= IFA_MAX; ++i) { 1748 if (!tb[i]) 1749 continue; 1750 1751 if (i == IFA_TARGET_NETNSID) { 1752 struct net *net; 1753 1754 fillargs->netnsid = nla_get_s32(tb[i]); 1755 1756 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 1757 if (IS_ERR(net)) { 1758 fillargs->netnsid = -1; 1759 NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id"); 1760 return PTR_ERR(net); 1761 } 1762 *tgt_net = net; 1763 } else { 1764 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request"); 1765 return -EINVAL; 1766 } 1767 } 1768 1769 return 0; 1770 } 1771 1772 static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb, 1773 struct netlink_callback *cb, int s_ip_idx, 1774 struct inet_fill_args *fillargs) 1775 { 1776 struct in_ifaddr *ifa; 1777 int ip_idx = 0; 1778 int err; 1779 1780 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 1781 if (ip_idx < s_ip_idx) { 1782 ip_idx++; 1783 continue; 1784 } 1785 err = inet_fill_ifaddr(skb, ifa, fillargs); 1786 if (err < 0) 1787 goto done; 1788 1789 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1790 ip_idx++; 1791 } 1792 err = 0; 1793 1794 done: 1795 cb->args[2] = ip_idx; 1796 1797 return err; 1798 } 1799 1800 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1801 { 1802 const struct nlmsghdr *nlh = cb->nlh; 1803 struct inet_fill_args fillargs = { 1804 .portid = NETLINK_CB(cb->skb).portid, 1805 .seq = nlh->nlmsg_seq, 1806 .event = RTM_NEWADDR, 1807 .flags = NLM_F_MULTI, 1808 .netnsid = -1, 1809 }; 1810 struct net *net = sock_net(skb->sk); 1811 struct net *tgt_net = net; 1812 int h, s_h; 1813 int idx, s_idx; 1814 int s_ip_idx; 1815 struct net_device *dev; 1816 struct in_device *in_dev; 1817 struct hlist_head *head; 1818 int err = 0; 1819 1820 s_h = cb->args[0]; 1821 s_idx = idx = cb->args[1]; 1822 s_ip_idx = cb->args[2]; 1823 1824 if (cb->strict_check) { 1825 err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 1826 skb->sk, cb); 1827 if (err < 0) 1828 goto put_tgt_net; 1829 1830 err = 0; 1831 if (fillargs.ifindex) { 1832 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 1833 if (!dev) { 1834 err = -ENODEV; 1835 goto put_tgt_net; 1836 } 1837 1838 in_dev = __in_dev_get_rtnl(dev); 1839 if (in_dev) { 1840 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx, 1841 &fillargs); 1842 } 1843 goto put_tgt_net; 1844 } 1845 } 1846 1847 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1848 idx = 0; 1849 head = &tgt_net->dev_index_head[h]; 1850 rcu_read_lock(); 1851 cb->seq = atomic_read(&tgt_net->ipv4.dev_addr_genid) ^ 1852 tgt_net->dev_base_seq; 1853 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1854 if (idx < s_idx) 1855 goto cont; 1856 if (h > s_h || idx > s_idx) 1857 s_ip_idx = 0; 1858 in_dev = __in_dev_get_rcu(dev); 1859 if (!in_dev) 1860 goto cont; 1861 1862 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx, 1863 &fillargs); 1864 if (err < 0) { 1865 rcu_read_unlock(); 1866 goto done; 1867 } 1868 cont: 1869 idx++; 1870 } 1871 rcu_read_unlock(); 1872 } 1873 1874 done: 1875 cb->args[0] = h; 1876 cb->args[1] = idx; 1877 put_tgt_net: 1878 if (fillargs.netnsid >= 0) 1879 put_net(tgt_net); 1880 1881 return skb->len ? : err; 1882 } 1883 1884 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, 1885 u32 portid) 1886 { 1887 struct inet_fill_args fillargs = { 1888 .portid = portid, 1889 .seq = nlh ? nlh->nlmsg_seq : 0, 1890 .event = event, 1891 .flags = 0, 1892 .netnsid = -1, 1893 }; 1894 struct sk_buff *skb; 1895 int err = -ENOBUFS; 1896 struct net *net; 1897 1898 net = dev_net(ifa->ifa_dev->dev); 1899 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1900 if (!skb) 1901 goto errout; 1902 1903 err = inet_fill_ifaddr(skb, ifa, &fillargs); 1904 if (err < 0) { 1905 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1906 WARN_ON(err == -EMSGSIZE); 1907 kfree_skb(skb); 1908 goto errout; 1909 } 1910 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1911 return; 1912 errout: 1913 if (err < 0) 1914 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); 1915 } 1916 1917 static size_t inet_get_link_af_size(const struct net_device *dev, 1918 u32 ext_filter_mask) 1919 { 1920 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1921 1922 if (!in_dev) 1923 return 0; 1924 1925 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ 1926 } 1927 1928 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 1929 u32 ext_filter_mask) 1930 { 1931 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1932 struct nlattr *nla; 1933 int i; 1934 1935 if (!in_dev) 1936 return -ENODATA; 1937 1938 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); 1939 if (!nla) 1940 return -EMSGSIZE; 1941 1942 for (i = 0; i < IPV4_DEVCONF_MAX; i++) 1943 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; 1944 1945 return 0; 1946 } 1947 1948 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { 1949 [IFLA_INET_CONF] = { .type = NLA_NESTED }, 1950 }; 1951 1952 static int inet_validate_link_af(const struct net_device *dev, 1953 const struct nlattr *nla) 1954 { 1955 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1956 int err, rem; 1957 1958 if (dev && !__in_dev_get_rcu(dev)) 1959 return -EAFNOSUPPORT; 1960 1961 err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, 1962 inet_af_policy, NULL); 1963 if (err < 0) 1964 return err; 1965 1966 if (tb[IFLA_INET_CONF]) { 1967 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { 1968 int cfgid = nla_type(a); 1969 1970 if (nla_len(a) < 4) 1971 return -EINVAL; 1972 1973 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) 1974 return -EINVAL; 1975 } 1976 } 1977 1978 return 0; 1979 } 1980 1981 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) 1982 { 1983 struct in_device *in_dev = __in_dev_get_rcu(dev); 1984 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1985 int rem; 1986 1987 if (!in_dev) 1988 return -EAFNOSUPPORT; 1989 1990 if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0) 1991 BUG(); 1992 1993 if (tb[IFLA_INET_CONF]) { 1994 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) 1995 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); 1996 } 1997 1998 return 0; 1999 } 2000 2001 static int inet_netconf_msgsize_devconf(int type) 2002 { 2003 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 2004 + nla_total_size(4); /* NETCONFA_IFINDEX */ 2005 bool all = false; 2006 2007 if (type == NETCONFA_ALL) 2008 all = true; 2009 2010 if (all || type == NETCONFA_FORWARDING) 2011 size += nla_total_size(4); 2012 if (all || type == NETCONFA_RP_FILTER) 2013 size += nla_total_size(4); 2014 if (all || type == NETCONFA_MC_FORWARDING) 2015 size += nla_total_size(4); 2016 if (all || type == NETCONFA_BC_FORWARDING) 2017 size += nla_total_size(4); 2018 if (all || type == NETCONFA_PROXY_NEIGH) 2019 size += nla_total_size(4); 2020 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 2021 size += nla_total_size(4); 2022 2023 return size; 2024 } 2025 2026 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 2027 struct ipv4_devconf *devconf, u32 portid, 2028 u32 seq, int event, unsigned int flags, 2029 int type) 2030 { 2031 struct nlmsghdr *nlh; 2032 struct netconfmsg *ncm; 2033 bool all = false; 2034 2035 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 2036 flags); 2037 if (!nlh) 2038 return -EMSGSIZE; 2039 2040 if (type == NETCONFA_ALL) 2041 all = true; 2042 2043 ncm = nlmsg_data(nlh); 2044 ncm->ncm_family = AF_INET; 2045 2046 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 2047 goto nla_put_failure; 2048 2049 if (!devconf) 2050 goto out; 2051 2052 if ((all || type == NETCONFA_FORWARDING) && 2053 nla_put_s32(skb, NETCONFA_FORWARDING, 2054 IPV4_DEVCONF(*devconf, FORWARDING)) < 0) 2055 goto nla_put_failure; 2056 if ((all || type == NETCONFA_RP_FILTER) && 2057 nla_put_s32(skb, NETCONFA_RP_FILTER, 2058 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) 2059 goto nla_put_failure; 2060 if ((all || type == NETCONFA_MC_FORWARDING) && 2061 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 2062 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) 2063 goto nla_put_failure; 2064 if ((all || type == NETCONFA_BC_FORWARDING) && 2065 nla_put_s32(skb, NETCONFA_BC_FORWARDING, 2066 IPV4_DEVCONF(*devconf, BC_FORWARDING)) < 0) 2067 goto nla_put_failure; 2068 if ((all || type == NETCONFA_PROXY_NEIGH) && 2069 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 2070 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0) 2071 goto nla_put_failure; 2072 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 2073 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 2074 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0) 2075 goto nla_put_failure; 2076 2077 out: 2078 nlmsg_end(skb, nlh); 2079 return 0; 2080 2081 nla_put_failure: 2082 nlmsg_cancel(skb, nlh); 2083 return -EMSGSIZE; 2084 } 2085 2086 void inet_netconf_notify_devconf(struct net *net, int event, int type, 2087 int ifindex, struct ipv4_devconf *devconf) 2088 { 2089 struct sk_buff *skb; 2090 int err = -ENOBUFS; 2091 2092 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL); 2093 if (!skb) 2094 goto errout; 2095 2096 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 2097 event, 0, type); 2098 if (err < 0) { 2099 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 2100 WARN_ON(err == -EMSGSIZE); 2101 kfree_skb(skb); 2102 goto errout; 2103 } 2104 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL); 2105 return; 2106 errout: 2107 if (err < 0) 2108 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); 2109 } 2110 2111 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { 2112 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 2113 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 2114 [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, 2115 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 2116 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 2117 }; 2118 2119 static int inet_netconf_valid_get_req(struct sk_buff *skb, 2120 const struct nlmsghdr *nlh, 2121 struct nlattr **tb, 2122 struct netlink_ext_ack *extack) 2123 { 2124 int i, err; 2125 2126 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 2127 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request"); 2128 return -EINVAL; 2129 } 2130 2131 if (!netlink_strict_get_check(skb)) 2132 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 2133 tb, NETCONFA_MAX, 2134 devconf_ipv4_policy, extack); 2135 2136 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 2137 tb, NETCONFA_MAX, 2138 devconf_ipv4_policy, extack); 2139 if (err) 2140 return err; 2141 2142 for (i = 0; i <= NETCONFA_MAX; i++) { 2143 if (!tb[i]) 2144 continue; 2145 2146 switch (i) { 2147 case NETCONFA_IFINDEX: 2148 break; 2149 default: 2150 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request"); 2151 return -EINVAL; 2152 } 2153 } 2154 2155 return 0; 2156 } 2157 2158 static int inet_netconf_get_devconf(struct sk_buff *in_skb, 2159 struct nlmsghdr *nlh, 2160 struct netlink_ext_ack *extack) 2161 { 2162 struct net *net = sock_net(in_skb->sk); 2163 struct nlattr *tb[NETCONFA_MAX+1]; 2164 struct sk_buff *skb; 2165 struct ipv4_devconf *devconf; 2166 struct in_device *in_dev; 2167 struct net_device *dev; 2168 int ifindex; 2169 int err; 2170 2171 err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack); 2172 if (err) 2173 goto errout; 2174 2175 err = -EINVAL; 2176 if (!tb[NETCONFA_IFINDEX]) 2177 goto errout; 2178 2179 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 2180 switch (ifindex) { 2181 case NETCONFA_IFINDEX_ALL: 2182 devconf = net->ipv4.devconf_all; 2183 break; 2184 case NETCONFA_IFINDEX_DEFAULT: 2185 devconf = net->ipv4.devconf_dflt; 2186 break; 2187 default: 2188 dev = __dev_get_by_index(net, ifindex); 2189 if (!dev) 2190 goto errout; 2191 in_dev = __in_dev_get_rtnl(dev); 2192 if (!in_dev) 2193 goto errout; 2194 devconf = &in_dev->cnf; 2195 break; 2196 } 2197 2198 err = -ENOBUFS; 2199 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 2200 if (!skb) 2201 goto errout; 2202 2203 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 2204 NETLINK_CB(in_skb).portid, 2205 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 2206 NETCONFA_ALL); 2207 if (err < 0) { 2208 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 2209 WARN_ON(err == -EMSGSIZE); 2210 kfree_skb(skb); 2211 goto errout; 2212 } 2213 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 2214 errout: 2215 return err; 2216 } 2217 2218 static int inet_netconf_dump_devconf(struct sk_buff *skb, 2219 struct netlink_callback *cb) 2220 { 2221 const struct nlmsghdr *nlh = cb->nlh; 2222 struct net *net = sock_net(skb->sk); 2223 int h, s_h; 2224 int idx, s_idx; 2225 struct net_device *dev; 2226 struct in_device *in_dev; 2227 struct hlist_head *head; 2228 2229 if (cb->strict_check) { 2230 struct netlink_ext_ack *extack = cb->extack; 2231 struct netconfmsg *ncm; 2232 2233 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 2234 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request"); 2235 return -EINVAL; 2236 } 2237 2238 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 2239 NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request"); 2240 return -EINVAL; 2241 } 2242 } 2243 2244 s_h = cb->args[0]; 2245 s_idx = idx = cb->args[1]; 2246 2247 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 2248 idx = 0; 2249 head = &net->dev_index_head[h]; 2250 rcu_read_lock(); 2251 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 2252 net->dev_base_seq; 2253 hlist_for_each_entry_rcu(dev, head, index_hlist) { 2254 if (idx < s_idx) 2255 goto cont; 2256 in_dev = __in_dev_get_rcu(dev); 2257 if (!in_dev) 2258 goto cont; 2259 2260 if (inet_netconf_fill_devconf(skb, dev->ifindex, 2261 &in_dev->cnf, 2262 NETLINK_CB(cb->skb).portid, 2263 nlh->nlmsg_seq, 2264 RTM_NEWNETCONF, 2265 NLM_F_MULTI, 2266 NETCONFA_ALL) < 0) { 2267 rcu_read_unlock(); 2268 goto done; 2269 } 2270 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 2271 cont: 2272 idx++; 2273 } 2274 rcu_read_unlock(); 2275 } 2276 if (h == NETDEV_HASHENTRIES) { 2277 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 2278 net->ipv4.devconf_all, 2279 NETLINK_CB(cb->skb).portid, 2280 nlh->nlmsg_seq, 2281 RTM_NEWNETCONF, NLM_F_MULTI, 2282 NETCONFA_ALL) < 0) 2283 goto done; 2284 else 2285 h++; 2286 } 2287 if (h == NETDEV_HASHENTRIES + 1) { 2288 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 2289 net->ipv4.devconf_dflt, 2290 NETLINK_CB(cb->skb).portid, 2291 nlh->nlmsg_seq, 2292 RTM_NEWNETCONF, NLM_F_MULTI, 2293 NETCONFA_ALL) < 0) 2294 goto done; 2295 else 2296 h++; 2297 } 2298 done: 2299 cb->args[0] = h; 2300 cb->args[1] = idx; 2301 2302 return skb->len; 2303 } 2304 2305 #ifdef CONFIG_SYSCTL 2306 2307 static void devinet_copy_dflt_conf(struct net *net, int i) 2308 { 2309 struct net_device *dev; 2310 2311 rcu_read_lock(); 2312 for_each_netdev_rcu(net, dev) { 2313 struct in_device *in_dev; 2314 2315 in_dev = __in_dev_get_rcu(dev); 2316 if (in_dev && !test_bit(i, in_dev->cnf.state)) 2317 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 2318 } 2319 rcu_read_unlock(); 2320 } 2321 2322 /* called with RTNL locked */ 2323 static void inet_forward_change(struct net *net) 2324 { 2325 struct net_device *dev; 2326 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 2327 2328 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 2329 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 2330 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2331 NETCONFA_FORWARDING, 2332 NETCONFA_IFINDEX_ALL, 2333 net->ipv4.devconf_all); 2334 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2335 NETCONFA_FORWARDING, 2336 NETCONFA_IFINDEX_DEFAULT, 2337 net->ipv4.devconf_dflt); 2338 2339 for_each_netdev(net, dev) { 2340 struct in_device *in_dev; 2341 2342 if (on) 2343 dev_disable_lro(dev); 2344 2345 in_dev = __in_dev_get_rtnl(dev); 2346 if (in_dev) { 2347 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 2348 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2349 NETCONFA_FORWARDING, 2350 dev->ifindex, &in_dev->cnf); 2351 } 2352 } 2353 } 2354 2355 static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf) 2356 { 2357 if (cnf == net->ipv4.devconf_dflt) 2358 return NETCONFA_IFINDEX_DEFAULT; 2359 else if (cnf == net->ipv4.devconf_all) 2360 return NETCONFA_IFINDEX_ALL; 2361 else { 2362 struct in_device *idev 2363 = container_of(cnf, struct in_device, cnf); 2364 return idev->dev->ifindex; 2365 } 2366 } 2367 2368 static int devinet_conf_proc(struct ctl_table *ctl, int write, 2369 void *buffer, size_t *lenp, loff_t *ppos) 2370 { 2371 int old_value = *(int *)ctl->data; 2372 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2373 int new_value = *(int *)ctl->data; 2374 2375 if (write) { 2376 struct ipv4_devconf *cnf = ctl->extra1; 2377 struct net *net = ctl->extra2; 2378 int i = (int *)ctl->data - cnf->data; 2379 int ifindex; 2380 2381 set_bit(i, cnf->state); 2382 2383 if (cnf == net->ipv4.devconf_dflt) 2384 devinet_copy_dflt_conf(net, i); 2385 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || 2386 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) 2387 if ((new_value == 0) && (old_value != 0)) 2388 rt_cache_flush(net); 2389 2390 if (i == IPV4_DEVCONF_BC_FORWARDING - 1 && 2391 new_value != old_value) 2392 rt_cache_flush(net); 2393 2394 if (i == IPV4_DEVCONF_RP_FILTER - 1 && 2395 new_value != old_value) { 2396 ifindex = devinet_conf_ifindex(net, cnf); 2397 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2398 NETCONFA_RP_FILTER, 2399 ifindex, cnf); 2400 } 2401 if (i == IPV4_DEVCONF_PROXY_ARP - 1 && 2402 new_value != old_value) { 2403 ifindex = devinet_conf_ifindex(net, cnf); 2404 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2405 NETCONFA_PROXY_NEIGH, 2406 ifindex, cnf); 2407 } 2408 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 && 2409 new_value != old_value) { 2410 ifindex = devinet_conf_ifindex(net, cnf); 2411 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2412 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 2413 ifindex, cnf); 2414 } 2415 } 2416 2417 return ret; 2418 } 2419 2420 static int devinet_sysctl_forward(struct ctl_table *ctl, int write, 2421 void *buffer, size_t *lenp, loff_t *ppos) 2422 { 2423 int *valp = ctl->data; 2424 int val = *valp; 2425 loff_t pos = *ppos; 2426 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2427 2428 if (write && *valp != val) { 2429 struct net *net = ctl->extra2; 2430 2431 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { 2432 if (!rtnl_trylock()) { 2433 /* Restore the original values before restarting */ 2434 *valp = val; 2435 *ppos = pos; 2436 return restart_syscall(); 2437 } 2438 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { 2439 inet_forward_change(net); 2440 } else { 2441 struct ipv4_devconf *cnf = ctl->extra1; 2442 struct in_device *idev = 2443 container_of(cnf, struct in_device, cnf); 2444 if (*valp) 2445 dev_disable_lro(idev->dev); 2446 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2447 NETCONFA_FORWARDING, 2448 idev->dev->ifindex, 2449 cnf); 2450 } 2451 rtnl_unlock(); 2452 rt_cache_flush(net); 2453 } else 2454 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, 2455 NETCONFA_FORWARDING, 2456 NETCONFA_IFINDEX_DEFAULT, 2457 net->ipv4.devconf_dflt); 2458 } 2459 2460 return ret; 2461 } 2462 2463 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write, 2464 void *buffer, size_t *lenp, loff_t *ppos) 2465 { 2466 int *valp = ctl->data; 2467 int val = *valp; 2468 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2469 struct net *net = ctl->extra2; 2470 2471 if (write && *valp != val) 2472 rt_cache_flush(net); 2473 2474 return ret; 2475 } 2476 2477 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ 2478 { \ 2479 .procname = name, \ 2480 .data = ipv4_devconf.data + \ 2481 IPV4_DEVCONF_ ## attr - 1, \ 2482 .maxlen = sizeof(int), \ 2483 .mode = mval, \ 2484 .proc_handler = proc, \ 2485 .extra1 = &ipv4_devconf, \ 2486 } 2487 2488 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 2489 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) 2490 2491 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 2492 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) 2493 2494 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ 2495 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) 2496 2497 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 2498 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) 2499 2500 static struct devinet_sysctl_table { 2501 struct ctl_table_header *sysctl_header; 2502 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; 2503 } devinet_sysctl = { 2504 .devinet_vars = { 2505 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 2506 devinet_sysctl_forward), 2507 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 2508 DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"), 2509 2510 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 2511 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 2512 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 2513 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 2514 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 2515 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 2516 "accept_source_route"), 2517 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), 2518 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), 2519 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 2520 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 2521 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 2522 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 2523 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 2524 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 2525 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 2526 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 2527 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 2528 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), 2529 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), 2530 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION, 2531 "force_igmp_version"), 2532 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL, 2533 "igmpv2_unsolicited_report_interval"), 2534 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL, 2535 "igmpv3_unsolicited_report_interval"), 2536 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN, 2537 "ignore_routes_with_linkdown"), 2538 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP, 2539 "drop_gratuitous_arp"), 2540 2541 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 2542 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 2543 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 2544 "promote_secondaries"), 2545 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, 2546 "route_localnet"), 2547 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST, 2548 "drop_unicast_in_l2_multicast"), 2549 }, 2550 }; 2551 2552 static int __devinet_sysctl_register(struct net *net, char *dev_name, 2553 int ifindex, struct ipv4_devconf *p) 2554 { 2555 int i; 2556 struct devinet_sysctl_table *t; 2557 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; 2558 2559 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 2560 if (!t) 2561 goto out; 2562 2563 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 2564 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 2565 t->devinet_vars[i].extra1 = p; 2566 t->devinet_vars[i].extra2 = net; 2567 } 2568 2569 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); 2570 2571 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); 2572 if (!t->sysctl_header) 2573 goto free; 2574 2575 p->sysctl = t; 2576 2577 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 2578 ifindex, p); 2579 return 0; 2580 2581 free: 2582 kfree(t); 2583 out: 2584 return -ENOBUFS; 2585 } 2586 2587 static void __devinet_sysctl_unregister(struct net *net, 2588 struct ipv4_devconf *cnf, int ifindex) 2589 { 2590 struct devinet_sysctl_table *t = cnf->sysctl; 2591 2592 if (t) { 2593 cnf->sysctl = NULL; 2594 unregister_net_sysctl_table(t->sysctl_header); 2595 kfree(t); 2596 } 2597 2598 inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 2599 } 2600 2601 static int devinet_sysctl_register(struct in_device *idev) 2602 { 2603 int err; 2604 2605 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 2606 return -EINVAL; 2607 2608 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL); 2609 if (err) 2610 return err; 2611 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, 2612 idev->dev->ifindex, &idev->cnf); 2613 if (err) 2614 neigh_sysctl_unregister(idev->arp_parms); 2615 return err; 2616 } 2617 2618 static void devinet_sysctl_unregister(struct in_device *idev) 2619 { 2620 struct net *net = dev_net(idev->dev); 2621 2622 __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex); 2623 neigh_sysctl_unregister(idev->arp_parms); 2624 } 2625 2626 static struct ctl_table ctl_forward_entry[] = { 2627 { 2628 .procname = "ip_forward", 2629 .data = &ipv4_devconf.data[ 2630 IPV4_DEVCONF_FORWARDING - 1], 2631 .maxlen = sizeof(int), 2632 .mode = 0644, 2633 .proc_handler = devinet_sysctl_forward, 2634 .extra1 = &ipv4_devconf, 2635 .extra2 = &init_net, 2636 }, 2637 { }, 2638 }; 2639 #endif 2640 2641 static __net_init int devinet_init_net(struct net *net) 2642 { 2643 int err; 2644 struct ipv4_devconf *all, *dflt; 2645 #ifdef CONFIG_SYSCTL 2646 struct ctl_table *tbl; 2647 struct ctl_table_header *forw_hdr; 2648 #endif 2649 2650 err = -ENOMEM; 2651 all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL); 2652 if (!all) 2653 goto err_alloc_all; 2654 2655 dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 2656 if (!dflt) 2657 goto err_alloc_dflt; 2658 2659 #ifdef CONFIG_SYSCTL 2660 tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL); 2661 if (!tbl) 2662 goto err_alloc_ctl; 2663 2664 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; 2665 tbl[0].extra1 = all; 2666 tbl[0].extra2 = net; 2667 #endif 2668 2669 if (!net_eq(net, &init_net)) { 2670 if (IS_ENABLED(CONFIG_SYSCTL) && 2671 sysctl_devconf_inherit_init_net == 3) { 2672 /* copy from the current netns */ 2673 memcpy(all, current->nsproxy->net_ns->ipv4.devconf_all, 2674 sizeof(ipv4_devconf)); 2675 memcpy(dflt, 2676 current->nsproxy->net_ns->ipv4.devconf_dflt, 2677 sizeof(ipv4_devconf_dflt)); 2678 } else if (!IS_ENABLED(CONFIG_SYSCTL) || 2679 sysctl_devconf_inherit_init_net != 2) { 2680 /* inherit == 0 or 1: copy from init_net */ 2681 memcpy(all, init_net.ipv4.devconf_all, 2682 sizeof(ipv4_devconf)); 2683 memcpy(dflt, init_net.ipv4.devconf_dflt, 2684 sizeof(ipv4_devconf_dflt)); 2685 } 2686 /* else inherit == 2: use compiled values */ 2687 } 2688 2689 #ifdef CONFIG_SYSCTL 2690 err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all); 2691 if (err < 0) 2692 goto err_reg_all; 2693 2694 err = __devinet_sysctl_register(net, "default", 2695 NETCONFA_IFINDEX_DEFAULT, dflt); 2696 if (err < 0) 2697 goto err_reg_dflt; 2698 2699 err = -ENOMEM; 2700 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); 2701 if (!forw_hdr) 2702 goto err_reg_ctl; 2703 net->ipv4.forw_hdr = forw_hdr; 2704 #endif 2705 2706 net->ipv4.devconf_all = all; 2707 net->ipv4.devconf_dflt = dflt; 2708 return 0; 2709 2710 #ifdef CONFIG_SYSCTL 2711 err_reg_ctl: 2712 __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT); 2713 err_reg_dflt: 2714 __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 2715 err_reg_all: 2716 kfree(tbl); 2717 err_alloc_ctl: 2718 #endif 2719 kfree(dflt); 2720 err_alloc_dflt: 2721 kfree(all); 2722 err_alloc_all: 2723 return err; 2724 } 2725 2726 static __net_exit void devinet_exit_net(struct net *net) 2727 { 2728 #ifdef CONFIG_SYSCTL 2729 struct ctl_table *tbl; 2730 2731 tbl = net->ipv4.forw_hdr->ctl_table_arg; 2732 unregister_net_sysctl_table(net->ipv4.forw_hdr); 2733 __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt, 2734 NETCONFA_IFINDEX_DEFAULT); 2735 __devinet_sysctl_unregister(net, net->ipv4.devconf_all, 2736 NETCONFA_IFINDEX_ALL); 2737 kfree(tbl); 2738 #endif 2739 kfree(net->ipv4.devconf_dflt); 2740 kfree(net->ipv4.devconf_all); 2741 } 2742 2743 static __net_initdata struct pernet_operations devinet_ops = { 2744 .init = devinet_init_net, 2745 .exit = devinet_exit_net, 2746 }; 2747 2748 static struct rtnl_af_ops inet_af_ops __read_mostly = { 2749 .family = AF_INET, 2750 .fill_link_af = inet_fill_link_af, 2751 .get_link_af_size = inet_get_link_af_size, 2752 .validate_link_af = inet_validate_link_af, 2753 .set_link_af = inet_set_link_af, 2754 }; 2755 2756 void __init devinet_init(void) 2757 { 2758 int i; 2759 2760 for (i = 0; i < IN4_ADDR_HSIZE; i++) 2761 INIT_HLIST_HEAD(&inet_addr_lst[i]); 2762 2763 register_pernet_subsys(&devinet_ops); 2764 2765 register_gifconf(PF_INET, inet_gifconf); 2766 register_netdevice_notifier(&ip_netdev_notifier); 2767 2768 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); 2769 2770 rtnl_af_register(&inet_af_ops); 2771 2772 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0); 2773 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0); 2774 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0); 2775 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, 2776 inet_netconf_dump_devconf, 0); 2777 } 2778