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 { 1649 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1650 1651 if (!in_dev) 1652 return 0; 1653 1654 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ 1655 } 1656 1657 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 1658 u32 ext_filter_mask) 1659 { 1660 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1661 struct nlattr *nla; 1662 int i; 1663 1664 if (!in_dev) 1665 return -ENODATA; 1666 1667 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); 1668 if (!nla) 1669 return -EMSGSIZE; 1670 1671 for (i = 0; i < IPV4_DEVCONF_MAX; i++) 1672 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; 1673 1674 return 0; 1675 } 1676 1677 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { 1678 [IFLA_INET_CONF] = { .type = NLA_NESTED }, 1679 }; 1680 1681 static int inet_validate_link_af(const struct net_device *dev, 1682 const struct nlattr *nla) 1683 { 1684 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1685 int err, rem; 1686 1687 if (dev && !__in_dev_get_rtnl(dev)) 1688 return -EAFNOSUPPORT; 1689 1690 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); 1691 if (err < 0) 1692 return err; 1693 1694 if (tb[IFLA_INET_CONF]) { 1695 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { 1696 int cfgid = nla_type(a); 1697 1698 if (nla_len(a) < 4) 1699 return -EINVAL; 1700 1701 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) 1702 return -EINVAL; 1703 } 1704 } 1705 1706 return 0; 1707 } 1708 1709 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) 1710 { 1711 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1712 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1713 int rem; 1714 1715 if (!in_dev) 1716 return -EAFNOSUPPORT; 1717 1718 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) 1719 BUG(); 1720 1721 if (tb[IFLA_INET_CONF]) { 1722 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) 1723 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); 1724 } 1725 1726 return 0; 1727 } 1728 1729 static int inet_netconf_msgsize_devconf(int type) 1730 { 1731 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1732 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1733 1734 /* type -1 is used for ALL */ 1735 if (type == -1 || type == NETCONFA_FORWARDING) 1736 size += nla_total_size(4); 1737 if (type == -1 || type == NETCONFA_RP_FILTER) 1738 size += nla_total_size(4); 1739 if (type == -1 || type == NETCONFA_MC_FORWARDING) 1740 size += nla_total_size(4); 1741 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 1742 size += nla_total_size(4); 1743 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 1744 size += nla_total_size(4); 1745 1746 return size; 1747 } 1748 1749 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 1750 struct ipv4_devconf *devconf, u32 portid, 1751 u32 seq, int event, unsigned int flags, 1752 int type) 1753 { 1754 struct nlmsghdr *nlh; 1755 struct netconfmsg *ncm; 1756 1757 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1758 flags); 1759 if (!nlh) 1760 return -EMSGSIZE; 1761 1762 ncm = nlmsg_data(nlh); 1763 ncm->ncm_family = AF_INET; 1764 1765 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 1766 goto nla_put_failure; 1767 1768 /* type -1 is used for ALL */ 1769 if ((type == -1 || type == NETCONFA_FORWARDING) && 1770 nla_put_s32(skb, NETCONFA_FORWARDING, 1771 IPV4_DEVCONF(*devconf, FORWARDING)) < 0) 1772 goto nla_put_failure; 1773 if ((type == -1 || type == NETCONFA_RP_FILTER) && 1774 nla_put_s32(skb, NETCONFA_RP_FILTER, 1775 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) 1776 goto nla_put_failure; 1777 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 1778 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 1779 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) 1780 goto nla_put_failure; 1781 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 1782 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 1783 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0) 1784 goto nla_put_failure; 1785 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 1786 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 1787 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0) 1788 goto nla_put_failure; 1789 1790 nlmsg_end(skb, nlh); 1791 return 0; 1792 1793 nla_put_failure: 1794 nlmsg_cancel(skb, nlh); 1795 return -EMSGSIZE; 1796 } 1797 1798 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex, 1799 struct ipv4_devconf *devconf) 1800 { 1801 struct sk_buff *skb; 1802 int err = -ENOBUFS; 1803 1804 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC); 1805 if (!skb) 1806 goto errout; 1807 1808 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 1809 RTM_NEWNETCONF, 0, type); 1810 if (err < 0) { 1811 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1812 WARN_ON(err == -EMSGSIZE); 1813 kfree_skb(skb); 1814 goto errout; 1815 } 1816 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC); 1817 return; 1818 errout: 1819 if (err < 0) 1820 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); 1821 } 1822 1823 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { 1824 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1825 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 1826 [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, 1827 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 1828 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 1829 }; 1830 1831 static int inet_netconf_get_devconf(struct sk_buff *in_skb, 1832 struct nlmsghdr *nlh) 1833 { 1834 struct net *net = sock_net(in_skb->sk); 1835 struct nlattr *tb[NETCONFA_MAX+1]; 1836 struct netconfmsg *ncm; 1837 struct sk_buff *skb; 1838 struct ipv4_devconf *devconf; 1839 struct in_device *in_dev; 1840 struct net_device *dev; 1841 int ifindex; 1842 int err; 1843 1844 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 1845 devconf_ipv4_policy); 1846 if (err < 0) 1847 goto errout; 1848 1849 err = EINVAL; 1850 if (!tb[NETCONFA_IFINDEX]) 1851 goto errout; 1852 1853 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1854 switch (ifindex) { 1855 case NETCONFA_IFINDEX_ALL: 1856 devconf = net->ipv4.devconf_all; 1857 break; 1858 case NETCONFA_IFINDEX_DEFAULT: 1859 devconf = net->ipv4.devconf_dflt; 1860 break; 1861 default: 1862 dev = __dev_get_by_index(net, ifindex); 1863 if (!dev) 1864 goto errout; 1865 in_dev = __in_dev_get_rtnl(dev); 1866 if (!in_dev) 1867 goto errout; 1868 devconf = &in_dev->cnf; 1869 break; 1870 } 1871 1872 err = -ENOBUFS; 1873 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC); 1874 if (!skb) 1875 goto errout; 1876 1877 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 1878 NETLINK_CB(in_skb).portid, 1879 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1880 -1); 1881 if (err < 0) { 1882 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1883 WARN_ON(err == -EMSGSIZE); 1884 kfree_skb(skb); 1885 goto errout; 1886 } 1887 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1888 errout: 1889 return err; 1890 } 1891 1892 static int inet_netconf_dump_devconf(struct sk_buff *skb, 1893 struct netlink_callback *cb) 1894 { 1895 struct net *net = sock_net(skb->sk); 1896 int h, s_h; 1897 int idx, s_idx; 1898 struct net_device *dev; 1899 struct in_device *in_dev; 1900 struct hlist_head *head; 1901 1902 s_h = cb->args[0]; 1903 s_idx = idx = cb->args[1]; 1904 1905 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1906 idx = 0; 1907 head = &net->dev_index_head[h]; 1908 rcu_read_lock(); 1909 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1910 net->dev_base_seq; 1911 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1912 if (idx < s_idx) 1913 goto cont; 1914 in_dev = __in_dev_get_rcu(dev); 1915 if (!in_dev) 1916 goto cont; 1917 1918 if (inet_netconf_fill_devconf(skb, dev->ifindex, 1919 &in_dev->cnf, 1920 NETLINK_CB(cb->skb).portid, 1921 cb->nlh->nlmsg_seq, 1922 RTM_NEWNETCONF, 1923 NLM_F_MULTI, 1924 -1) < 0) { 1925 rcu_read_unlock(); 1926 goto done; 1927 } 1928 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1929 cont: 1930 idx++; 1931 } 1932 rcu_read_unlock(); 1933 } 1934 if (h == NETDEV_HASHENTRIES) { 1935 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 1936 net->ipv4.devconf_all, 1937 NETLINK_CB(cb->skb).portid, 1938 cb->nlh->nlmsg_seq, 1939 RTM_NEWNETCONF, NLM_F_MULTI, 1940 -1) < 0) 1941 goto done; 1942 else 1943 h++; 1944 } 1945 if (h == NETDEV_HASHENTRIES + 1) { 1946 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 1947 net->ipv4.devconf_dflt, 1948 NETLINK_CB(cb->skb).portid, 1949 cb->nlh->nlmsg_seq, 1950 RTM_NEWNETCONF, NLM_F_MULTI, 1951 -1) < 0) 1952 goto done; 1953 else 1954 h++; 1955 } 1956 done: 1957 cb->args[0] = h; 1958 cb->args[1] = idx; 1959 1960 return skb->len; 1961 } 1962 1963 #ifdef CONFIG_SYSCTL 1964 1965 static void devinet_copy_dflt_conf(struct net *net, int i) 1966 { 1967 struct net_device *dev; 1968 1969 rcu_read_lock(); 1970 for_each_netdev_rcu(net, dev) { 1971 struct in_device *in_dev; 1972 1973 in_dev = __in_dev_get_rcu(dev); 1974 if (in_dev && !test_bit(i, in_dev->cnf.state)) 1975 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 1976 } 1977 rcu_read_unlock(); 1978 } 1979 1980 /* called with RTNL locked */ 1981 static void inet_forward_change(struct net *net) 1982 { 1983 struct net_device *dev; 1984 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 1985 1986 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 1987 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 1988 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1989 NETCONFA_IFINDEX_ALL, 1990 net->ipv4.devconf_all); 1991 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1992 NETCONFA_IFINDEX_DEFAULT, 1993 net->ipv4.devconf_dflt); 1994 1995 for_each_netdev(net, dev) { 1996 struct in_device *in_dev; 1997 if (on) 1998 dev_disable_lro(dev); 1999 rcu_read_lock(); 2000 in_dev = __in_dev_get_rcu(dev); 2001 if (in_dev) { 2002 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 2003 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 2004 dev->ifindex, &in_dev->cnf); 2005 } 2006 rcu_read_unlock(); 2007 } 2008 } 2009 2010 static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf) 2011 { 2012 if (cnf == net->ipv4.devconf_dflt) 2013 return NETCONFA_IFINDEX_DEFAULT; 2014 else if (cnf == net->ipv4.devconf_all) 2015 return NETCONFA_IFINDEX_ALL; 2016 else { 2017 struct in_device *idev 2018 = container_of(cnf, struct in_device, cnf); 2019 return idev->dev->ifindex; 2020 } 2021 } 2022 2023 static int devinet_conf_proc(struct ctl_table *ctl, int write, 2024 void __user *buffer, 2025 size_t *lenp, loff_t *ppos) 2026 { 2027 int old_value = *(int *)ctl->data; 2028 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2029 int new_value = *(int *)ctl->data; 2030 2031 if (write) { 2032 struct ipv4_devconf *cnf = ctl->extra1; 2033 struct net *net = ctl->extra2; 2034 int i = (int *)ctl->data - cnf->data; 2035 int ifindex; 2036 2037 set_bit(i, cnf->state); 2038 2039 if (cnf == net->ipv4.devconf_dflt) 2040 devinet_copy_dflt_conf(net, i); 2041 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || 2042 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) 2043 if ((new_value == 0) && (old_value != 0)) 2044 rt_cache_flush(net); 2045 2046 if (i == IPV4_DEVCONF_RP_FILTER - 1 && 2047 new_value != old_value) { 2048 ifindex = devinet_conf_ifindex(net, cnf); 2049 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER, 2050 ifindex, cnf); 2051 } 2052 if (i == IPV4_DEVCONF_PROXY_ARP - 1 && 2053 new_value != old_value) { 2054 ifindex = devinet_conf_ifindex(net, cnf); 2055 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 2056 ifindex, cnf); 2057 } 2058 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 && 2059 new_value != old_value) { 2060 ifindex = devinet_conf_ifindex(net, cnf); 2061 inet_netconf_notify_devconf(net, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 2062 ifindex, cnf); 2063 } 2064 } 2065 2066 return ret; 2067 } 2068 2069 static int devinet_sysctl_forward(struct ctl_table *ctl, int write, 2070 void __user *buffer, 2071 size_t *lenp, loff_t *ppos) 2072 { 2073 int *valp = ctl->data; 2074 int val = *valp; 2075 loff_t pos = *ppos; 2076 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2077 2078 if (write && *valp != val) { 2079 struct net *net = ctl->extra2; 2080 2081 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { 2082 if (!rtnl_trylock()) { 2083 /* Restore the original values before restarting */ 2084 *valp = val; 2085 *ppos = pos; 2086 return restart_syscall(); 2087 } 2088 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { 2089 inet_forward_change(net); 2090 } else { 2091 struct ipv4_devconf *cnf = ctl->extra1; 2092 struct in_device *idev = 2093 container_of(cnf, struct in_device, cnf); 2094 if (*valp) 2095 dev_disable_lro(idev->dev); 2096 inet_netconf_notify_devconf(net, 2097 NETCONFA_FORWARDING, 2098 idev->dev->ifindex, 2099 cnf); 2100 } 2101 rtnl_unlock(); 2102 rt_cache_flush(net); 2103 } else 2104 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 2105 NETCONFA_IFINDEX_DEFAULT, 2106 net->ipv4.devconf_dflt); 2107 } 2108 2109 return ret; 2110 } 2111 2112 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write, 2113 void __user *buffer, 2114 size_t *lenp, loff_t *ppos) 2115 { 2116 int *valp = ctl->data; 2117 int val = *valp; 2118 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2119 struct net *net = ctl->extra2; 2120 2121 if (write && *valp != val) 2122 rt_cache_flush(net); 2123 2124 return ret; 2125 } 2126 2127 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ 2128 { \ 2129 .procname = name, \ 2130 .data = ipv4_devconf.data + \ 2131 IPV4_DEVCONF_ ## attr - 1, \ 2132 .maxlen = sizeof(int), \ 2133 .mode = mval, \ 2134 .proc_handler = proc, \ 2135 .extra1 = &ipv4_devconf, \ 2136 } 2137 2138 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 2139 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) 2140 2141 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 2142 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) 2143 2144 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ 2145 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) 2146 2147 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 2148 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) 2149 2150 static struct devinet_sysctl_table { 2151 struct ctl_table_header *sysctl_header; 2152 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; 2153 } devinet_sysctl = { 2154 .devinet_vars = { 2155 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 2156 devinet_sysctl_forward), 2157 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 2158 2159 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 2160 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 2161 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 2162 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 2163 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 2164 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 2165 "accept_source_route"), 2166 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), 2167 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), 2168 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 2169 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 2170 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 2171 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 2172 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 2173 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 2174 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 2175 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 2176 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 2177 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), 2178 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), 2179 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION, 2180 "force_igmp_version"), 2181 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL, 2182 "igmpv2_unsolicited_report_interval"), 2183 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL, 2184 "igmpv3_unsolicited_report_interval"), 2185 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN, 2186 "ignore_routes_with_linkdown"), 2187 2188 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 2189 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 2190 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 2191 "promote_secondaries"), 2192 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, 2193 "route_localnet"), 2194 }, 2195 }; 2196 2197 static int __devinet_sysctl_register(struct net *net, char *dev_name, 2198 struct ipv4_devconf *p) 2199 { 2200 int i; 2201 struct devinet_sysctl_table *t; 2202 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; 2203 2204 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 2205 if (!t) 2206 goto out; 2207 2208 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 2209 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 2210 t->devinet_vars[i].extra1 = p; 2211 t->devinet_vars[i].extra2 = net; 2212 } 2213 2214 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); 2215 2216 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); 2217 if (!t->sysctl_header) 2218 goto free; 2219 2220 p->sysctl = t; 2221 return 0; 2222 2223 free: 2224 kfree(t); 2225 out: 2226 return -ENOBUFS; 2227 } 2228 2229 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) 2230 { 2231 struct devinet_sysctl_table *t = cnf->sysctl; 2232 2233 if (!t) 2234 return; 2235 2236 cnf->sysctl = NULL; 2237 unregister_net_sysctl_table(t->sysctl_header); 2238 kfree(t); 2239 } 2240 2241 static int devinet_sysctl_register(struct in_device *idev) 2242 { 2243 int err; 2244 2245 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 2246 return -EINVAL; 2247 2248 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL); 2249 if (err) 2250 return err; 2251 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, 2252 &idev->cnf); 2253 if (err) 2254 neigh_sysctl_unregister(idev->arp_parms); 2255 return err; 2256 } 2257 2258 static void devinet_sysctl_unregister(struct in_device *idev) 2259 { 2260 __devinet_sysctl_unregister(&idev->cnf); 2261 neigh_sysctl_unregister(idev->arp_parms); 2262 } 2263 2264 static struct ctl_table ctl_forward_entry[] = { 2265 { 2266 .procname = "ip_forward", 2267 .data = &ipv4_devconf.data[ 2268 IPV4_DEVCONF_FORWARDING - 1], 2269 .maxlen = sizeof(int), 2270 .mode = 0644, 2271 .proc_handler = devinet_sysctl_forward, 2272 .extra1 = &ipv4_devconf, 2273 .extra2 = &init_net, 2274 }, 2275 { }, 2276 }; 2277 #endif 2278 2279 static __net_init int devinet_init_net(struct net *net) 2280 { 2281 int err; 2282 struct ipv4_devconf *all, *dflt; 2283 #ifdef CONFIG_SYSCTL 2284 struct ctl_table *tbl = ctl_forward_entry; 2285 struct ctl_table_header *forw_hdr; 2286 #endif 2287 2288 err = -ENOMEM; 2289 all = &ipv4_devconf; 2290 dflt = &ipv4_devconf_dflt; 2291 2292 if (!net_eq(net, &init_net)) { 2293 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); 2294 if (!all) 2295 goto err_alloc_all; 2296 2297 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 2298 if (!dflt) 2299 goto err_alloc_dflt; 2300 2301 #ifdef CONFIG_SYSCTL 2302 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); 2303 if (!tbl) 2304 goto err_alloc_ctl; 2305 2306 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; 2307 tbl[0].extra1 = all; 2308 tbl[0].extra2 = net; 2309 #endif 2310 } 2311 2312 #ifdef CONFIG_SYSCTL 2313 err = __devinet_sysctl_register(net, "all", all); 2314 if (err < 0) 2315 goto err_reg_all; 2316 2317 err = __devinet_sysctl_register(net, "default", dflt); 2318 if (err < 0) 2319 goto err_reg_dflt; 2320 2321 err = -ENOMEM; 2322 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); 2323 if (!forw_hdr) 2324 goto err_reg_ctl; 2325 net->ipv4.forw_hdr = forw_hdr; 2326 #endif 2327 2328 net->ipv4.devconf_all = all; 2329 net->ipv4.devconf_dflt = dflt; 2330 return 0; 2331 2332 #ifdef CONFIG_SYSCTL 2333 err_reg_ctl: 2334 __devinet_sysctl_unregister(dflt); 2335 err_reg_dflt: 2336 __devinet_sysctl_unregister(all); 2337 err_reg_all: 2338 if (tbl != ctl_forward_entry) 2339 kfree(tbl); 2340 err_alloc_ctl: 2341 #endif 2342 if (dflt != &ipv4_devconf_dflt) 2343 kfree(dflt); 2344 err_alloc_dflt: 2345 if (all != &ipv4_devconf) 2346 kfree(all); 2347 err_alloc_all: 2348 return err; 2349 } 2350 2351 static __net_exit void devinet_exit_net(struct net *net) 2352 { 2353 #ifdef CONFIG_SYSCTL 2354 struct ctl_table *tbl; 2355 2356 tbl = net->ipv4.forw_hdr->ctl_table_arg; 2357 unregister_net_sysctl_table(net->ipv4.forw_hdr); 2358 __devinet_sysctl_unregister(net->ipv4.devconf_dflt); 2359 __devinet_sysctl_unregister(net->ipv4.devconf_all); 2360 kfree(tbl); 2361 #endif 2362 kfree(net->ipv4.devconf_dflt); 2363 kfree(net->ipv4.devconf_all); 2364 } 2365 2366 static __net_initdata struct pernet_operations devinet_ops = { 2367 .init = devinet_init_net, 2368 .exit = devinet_exit_net, 2369 }; 2370 2371 static struct rtnl_af_ops inet_af_ops __read_mostly = { 2372 .family = AF_INET, 2373 .fill_link_af = inet_fill_link_af, 2374 .get_link_af_size = inet_get_link_af_size, 2375 .validate_link_af = inet_validate_link_af, 2376 .set_link_af = inet_set_link_af, 2377 }; 2378 2379 void __init devinet_init(void) 2380 { 2381 int i; 2382 2383 for (i = 0; i < IN4_ADDR_HSIZE; i++) 2384 INIT_HLIST_HEAD(&inet_addr_lst[i]); 2385 2386 register_pernet_subsys(&devinet_ops); 2387 2388 register_gifconf(PF_INET, inet_gifconf); 2389 register_netdevice_notifier(&ip_netdev_notifier); 2390 2391 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); 2392 2393 rtnl_af_register(&inet_af_ops); 2394 2395 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); 2396 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); 2397 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); 2398 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, 2399 inet_netconf_dump_devconf, NULL); 2400 } 2401 2402