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