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 }, 77 }; 78 79 static struct ipv4_devconf ipv4_devconf_dflt = { 80 .data = { 81 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, 82 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, 83 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, 84 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, 85 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1, 86 }, 87 }; 88 89 #define IPV4_DEVCONF_DFLT(net, attr) \ 90 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) 91 92 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { 93 [IFA_LOCAL] = { .type = NLA_U32 }, 94 [IFA_ADDRESS] = { .type = NLA_U32 }, 95 [IFA_BROADCAST] = { .type = NLA_U32 }, 96 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, 97 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 98 }; 99 100 #define IN4_ADDR_HSIZE_SHIFT 8 101 #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT) 102 103 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE]; 104 static DEFINE_SPINLOCK(inet_addr_hash_lock); 105 106 static u32 inet_addr_hash(struct net *net, __be32 addr) 107 { 108 u32 val = (__force u32) addr ^ net_hash_mix(net); 109 110 return hash_32(val, IN4_ADDR_HSIZE_SHIFT); 111 } 112 113 static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) 114 { 115 u32 hash = inet_addr_hash(net, ifa->ifa_local); 116 117 spin_lock(&inet_addr_hash_lock); 118 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); 119 spin_unlock(&inet_addr_hash_lock); 120 } 121 122 static void inet_hash_remove(struct in_ifaddr *ifa) 123 { 124 spin_lock(&inet_addr_hash_lock); 125 hlist_del_init_rcu(&ifa->hash); 126 spin_unlock(&inet_addr_hash_lock); 127 } 128 129 /** 130 * __ip_dev_find - find the first device with a given source address. 131 * @net: the net namespace 132 * @addr: the source address 133 * @devref: if true, take a reference on the found device 134 * 135 * If a caller uses devref=false, it should be protected by RCU, or RTNL 136 */ 137 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) 138 { 139 u32 hash = inet_addr_hash(net, addr); 140 struct net_device *result = NULL; 141 struct in_ifaddr *ifa; 142 143 rcu_read_lock(); 144 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) { 145 if (ifa->ifa_local == addr) { 146 struct net_device *dev = ifa->ifa_dev->dev; 147 148 if (!net_eq(dev_net(dev), net)) 149 continue; 150 result = dev; 151 break; 152 } 153 } 154 if (!result) { 155 struct flowi4 fl4 = { .daddr = addr }; 156 struct fib_result res = { 0 }; 157 struct fib_table *local; 158 159 /* Fallback to FIB local table so that communication 160 * over loopback subnets work. 161 */ 162 local = fib_get_table(net, RT_TABLE_LOCAL); 163 if (local && 164 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) && 165 res.type == RTN_LOCAL) 166 result = FIB_RES_DEV(res); 167 } 168 if (result && devref) 169 dev_hold(result); 170 rcu_read_unlock(); 171 return result; 172 } 173 EXPORT_SYMBOL(__ip_dev_find); 174 175 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); 176 177 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); 178 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 179 int destroy); 180 #ifdef CONFIG_SYSCTL 181 static void devinet_sysctl_register(struct in_device *idev); 182 static void devinet_sysctl_unregister(struct in_device *idev); 183 #else 184 static void devinet_sysctl_register(struct in_device *idev) 185 { 186 } 187 static void devinet_sysctl_unregister(struct in_device *idev) 188 { 189 } 190 #endif 191 192 /* Locks all the inet devices. */ 193 194 static struct in_ifaddr *inet_alloc_ifa(void) 195 { 196 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); 197 } 198 199 static void inet_rcu_free_ifa(struct rcu_head *head) 200 { 201 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); 202 if (ifa->ifa_dev) 203 in_dev_put(ifa->ifa_dev); 204 kfree(ifa); 205 } 206 207 static void inet_free_ifa(struct in_ifaddr *ifa) 208 { 209 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); 210 } 211 212 void in_dev_finish_destroy(struct in_device *idev) 213 { 214 struct net_device *dev = idev->dev; 215 216 WARN_ON(idev->ifa_list); 217 WARN_ON(idev->mc_list); 218 #ifdef NET_REFCNT_DEBUG 219 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL"); 220 #endif 221 dev_put(dev); 222 if (!idev->dead) 223 pr_err("Freeing alive in_device %p\n", idev); 224 else 225 kfree(idev); 226 } 227 EXPORT_SYMBOL(in_dev_finish_destroy); 228 229 static struct in_device *inetdev_init(struct net_device *dev) 230 { 231 struct in_device *in_dev; 232 233 ASSERT_RTNL(); 234 235 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); 236 if (!in_dev) 237 goto out; 238 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, 239 sizeof(in_dev->cnf)); 240 in_dev->cnf.sysctl = NULL; 241 in_dev->dev = dev; 242 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); 243 if (!in_dev->arp_parms) 244 goto out_kfree; 245 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) 246 dev_disable_lro(dev); 247 /* Reference in_dev->dev */ 248 dev_hold(dev); 249 /* Account for reference dev->ip_ptr (below) */ 250 in_dev_hold(in_dev); 251 252 devinet_sysctl_register(in_dev); 253 ip_mc_init_dev(in_dev); 254 if (dev->flags & IFF_UP) 255 ip_mc_up(in_dev); 256 257 /* we can receive as soon as ip_ptr is set -- do this last */ 258 rcu_assign_pointer(dev->ip_ptr, in_dev); 259 out: 260 return in_dev; 261 out_kfree: 262 kfree(in_dev); 263 in_dev = NULL; 264 goto out; 265 } 266 267 static void in_dev_rcu_put(struct rcu_head *head) 268 { 269 struct in_device *idev = container_of(head, struct in_device, rcu_head); 270 in_dev_put(idev); 271 } 272 273 static void inetdev_destroy(struct in_device *in_dev) 274 { 275 struct in_ifaddr *ifa; 276 struct net_device *dev; 277 278 ASSERT_RTNL(); 279 280 dev = in_dev->dev; 281 282 in_dev->dead = 1; 283 284 ip_mc_destroy_dev(in_dev); 285 286 while ((ifa = in_dev->ifa_list) != NULL) { 287 inet_del_ifa(in_dev, &in_dev->ifa_list, 0); 288 inet_free_ifa(ifa); 289 } 290 291 RCU_INIT_POINTER(dev->ip_ptr, NULL); 292 293 devinet_sysctl_unregister(in_dev); 294 neigh_parms_release(&arp_tbl, in_dev->arp_parms); 295 arp_ifdown(dev); 296 297 call_rcu(&in_dev->rcu_head, in_dev_rcu_put); 298 } 299 300 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) 301 { 302 rcu_read_lock(); 303 for_primary_ifa(in_dev) { 304 if (inet_ifa_match(a, ifa)) { 305 if (!b || inet_ifa_match(b, ifa)) { 306 rcu_read_unlock(); 307 return 1; 308 } 309 } 310 } endfor_ifa(in_dev); 311 rcu_read_unlock(); 312 return 0; 313 } 314 315 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 316 int destroy, struct nlmsghdr *nlh, u32 portid) 317 { 318 struct in_ifaddr *promote = NULL; 319 struct in_ifaddr *ifa, *ifa1 = *ifap; 320 struct in_ifaddr *last_prim = in_dev->ifa_list; 321 struct in_ifaddr *prev_prom = NULL; 322 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); 323 324 ASSERT_RTNL(); 325 326 /* 1. Deleting primary ifaddr forces deletion all secondaries 327 * unless alias promotion is set 328 **/ 329 330 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { 331 struct in_ifaddr **ifap1 = &ifa1->ifa_next; 332 333 while ((ifa = *ifap1) != NULL) { 334 if (!(ifa->ifa_flags & IFA_F_SECONDARY) && 335 ifa1->ifa_scope <= ifa->ifa_scope) 336 last_prim = ifa; 337 338 if (!(ifa->ifa_flags & IFA_F_SECONDARY) || 339 ifa1->ifa_mask != ifa->ifa_mask || 340 !inet_ifa_match(ifa1->ifa_address, ifa)) { 341 ifap1 = &ifa->ifa_next; 342 prev_prom = ifa; 343 continue; 344 } 345 346 if (!do_promote) { 347 inet_hash_remove(ifa); 348 *ifap1 = ifa->ifa_next; 349 350 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid); 351 blocking_notifier_call_chain(&inetaddr_chain, 352 NETDEV_DOWN, ifa); 353 inet_free_ifa(ifa); 354 } else { 355 promote = ifa; 356 break; 357 } 358 } 359 } 360 361 /* On promotion all secondaries from subnet are changing 362 * the primary IP, we must remove all their routes silently 363 * and later to add them back with new prefsrc. Do this 364 * while all addresses are on the device list. 365 */ 366 for (ifa = promote; ifa; ifa = ifa->ifa_next) { 367 if (ifa1->ifa_mask == ifa->ifa_mask && 368 inet_ifa_match(ifa1->ifa_address, ifa)) 369 fib_del_ifaddr(ifa, ifa1); 370 } 371 372 /* 2. Unlink it */ 373 374 *ifap = ifa1->ifa_next; 375 inet_hash_remove(ifa1); 376 377 /* 3. Announce address deletion */ 378 379 /* Send message first, then call notifier. 380 At first sight, FIB update triggered by notifier 381 will refer to already deleted ifaddr, that could confuse 382 netlink listeners. It is not true: look, gated sees 383 that route deleted and if it still thinks that ifaddr 384 is valid, it will try to restore deleted routes... Grr. 385 So that, this order is correct. 386 */ 387 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid); 388 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); 389 390 if (promote) { 391 struct in_ifaddr *next_sec = promote->ifa_next; 392 393 if (prev_prom) { 394 prev_prom->ifa_next = promote->ifa_next; 395 promote->ifa_next = last_prim->ifa_next; 396 last_prim->ifa_next = promote; 397 } 398 399 promote->ifa_flags &= ~IFA_F_SECONDARY; 400 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid); 401 blocking_notifier_call_chain(&inetaddr_chain, 402 NETDEV_UP, promote); 403 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) { 404 if (ifa1->ifa_mask != ifa->ifa_mask || 405 !inet_ifa_match(ifa1->ifa_address, ifa)) 406 continue; 407 fib_add_ifaddr(ifa); 408 } 409 410 } 411 if (destroy) 412 inet_free_ifa(ifa1); 413 } 414 415 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 416 int destroy) 417 { 418 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); 419 } 420 421 static void check_lifetime(struct work_struct *work); 422 423 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime); 424 425 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, 426 u32 portid) 427 { 428 struct in_device *in_dev = ifa->ifa_dev; 429 struct in_ifaddr *ifa1, **ifap, **last_primary; 430 431 ASSERT_RTNL(); 432 433 if (!ifa->ifa_local) { 434 inet_free_ifa(ifa); 435 return 0; 436 } 437 438 ifa->ifa_flags &= ~IFA_F_SECONDARY; 439 last_primary = &in_dev->ifa_list; 440 441 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 442 ifap = &ifa1->ifa_next) { 443 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && 444 ifa->ifa_scope <= ifa1->ifa_scope) 445 last_primary = &ifa1->ifa_next; 446 if (ifa1->ifa_mask == ifa->ifa_mask && 447 inet_ifa_match(ifa1->ifa_address, ifa)) { 448 if (ifa1->ifa_local == ifa->ifa_local) { 449 inet_free_ifa(ifa); 450 return -EEXIST; 451 } 452 if (ifa1->ifa_scope != ifa->ifa_scope) { 453 inet_free_ifa(ifa); 454 return -EINVAL; 455 } 456 ifa->ifa_flags |= IFA_F_SECONDARY; 457 } 458 } 459 460 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { 461 net_srandom(ifa->ifa_local); 462 ifap = last_primary; 463 } 464 465 ifa->ifa_next = *ifap; 466 *ifap = ifa; 467 468 inet_hash_insert(dev_net(in_dev->dev), ifa); 469 470 cancel_delayed_work(&check_lifetime_work); 471 schedule_delayed_work(&check_lifetime_work, 0); 472 473 /* Send message first, then call notifier. 474 Notifier will trigger FIB update, so that 475 listeners of netlink will know about new ifaddr */ 476 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid); 477 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 478 479 return 0; 480 } 481 482 static int inet_insert_ifa(struct in_ifaddr *ifa) 483 { 484 return __inet_insert_ifa(ifa, NULL, 0); 485 } 486 487 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) 488 { 489 struct in_device *in_dev = __in_dev_get_rtnl(dev); 490 491 ASSERT_RTNL(); 492 493 if (!in_dev) { 494 inet_free_ifa(ifa); 495 return -ENOBUFS; 496 } 497 ipv4_devconf_setall(in_dev); 498 if (ifa->ifa_dev != in_dev) { 499 WARN_ON(ifa->ifa_dev); 500 in_dev_hold(in_dev); 501 ifa->ifa_dev = in_dev; 502 } 503 if (ipv4_is_loopback(ifa->ifa_local)) 504 ifa->ifa_scope = RT_SCOPE_HOST; 505 return inet_insert_ifa(ifa); 506 } 507 508 /* Caller must hold RCU or RTNL : 509 * We dont take a reference on found in_device 510 */ 511 struct in_device *inetdev_by_index(struct net *net, int ifindex) 512 { 513 struct net_device *dev; 514 struct in_device *in_dev = NULL; 515 516 rcu_read_lock(); 517 dev = dev_get_by_index_rcu(net, ifindex); 518 if (dev) 519 in_dev = rcu_dereference_rtnl(dev->ip_ptr); 520 rcu_read_unlock(); 521 return in_dev; 522 } 523 EXPORT_SYMBOL(inetdev_by_index); 524 525 /* Called only from RTNL semaphored context. No locks. */ 526 527 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, 528 __be32 mask) 529 { 530 ASSERT_RTNL(); 531 532 for_primary_ifa(in_dev) { 533 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) 534 return ifa; 535 } endfor_ifa(in_dev); 536 return NULL; 537 } 538 539 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 540 { 541 struct net *net = sock_net(skb->sk); 542 struct nlattr *tb[IFA_MAX+1]; 543 struct in_device *in_dev; 544 struct ifaddrmsg *ifm; 545 struct in_ifaddr *ifa, **ifap; 546 int err = -EINVAL; 547 548 ASSERT_RTNL(); 549 550 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 551 if (err < 0) 552 goto errout; 553 554 ifm = nlmsg_data(nlh); 555 in_dev = inetdev_by_index(net, ifm->ifa_index); 556 if (in_dev == NULL) { 557 err = -ENODEV; 558 goto errout; 559 } 560 561 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 562 ifap = &ifa->ifa_next) { 563 if (tb[IFA_LOCAL] && 564 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) 565 continue; 566 567 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) 568 continue; 569 570 if (tb[IFA_ADDRESS] && 571 (ifm->ifa_prefixlen != ifa->ifa_prefixlen || 572 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) 573 continue; 574 575 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); 576 return 0; 577 } 578 579 err = -EADDRNOTAVAIL; 580 errout: 581 return err; 582 } 583 584 #define INFINITY_LIFE_TIME 0xFFFFFFFF 585 586 static void check_lifetime(struct work_struct *work) 587 { 588 unsigned long now, next, next_sec, next_sched; 589 struct in_ifaddr *ifa; 590 struct hlist_node *n; 591 int i; 592 593 now = jiffies; 594 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 595 596 for (i = 0; i < IN4_ADDR_HSIZE; i++) { 597 bool change_needed = false; 598 599 rcu_read_lock(); 600 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) { 601 unsigned long age; 602 603 if (ifa->ifa_flags & IFA_F_PERMANENT) 604 continue; 605 606 /* We try to batch several events at once. */ 607 age = (now - ifa->ifa_tstamp + 608 ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 609 610 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && 611 age >= ifa->ifa_valid_lft) { 612 change_needed = true; 613 } else if (ifa->ifa_preferred_lft == 614 INFINITY_LIFE_TIME) { 615 continue; 616 } else if (age >= ifa->ifa_preferred_lft) { 617 if (time_before(ifa->ifa_tstamp + 618 ifa->ifa_valid_lft * HZ, next)) 619 next = ifa->ifa_tstamp + 620 ifa->ifa_valid_lft * HZ; 621 622 if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) 623 change_needed = true; 624 } else if (time_before(ifa->ifa_tstamp + 625 ifa->ifa_preferred_lft * HZ, 626 next)) { 627 next = ifa->ifa_tstamp + 628 ifa->ifa_preferred_lft * HZ; 629 } 630 } 631 rcu_read_unlock(); 632 if (!change_needed) 633 continue; 634 rtnl_lock(); 635 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) { 636 unsigned long age; 637 638 if (ifa->ifa_flags & IFA_F_PERMANENT) 639 continue; 640 641 /* We try to batch several events at once. */ 642 age = (now - ifa->ifa_tstamp + 643 ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 644 645 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && 646 age >= ifa->ifa_valid_lft) { 647 struct in_ifaddr **ifap; 648 649 for (ifap = &ifa->ifa_dev->ifa_list; 650 *ifap != NULL; ifap = &(*ifap)->ifa_next) { 651 if (*ifap == ifa) { 652 inet_del_ifa(ifa->ifa_dev, 653 ifap, 1); 654 break; 655 } 656 } 657 } else if (ifa->ifa_preferred_lft != 658 INFINITY_LIFE_TIME && 659 age >= ifa->ifa_preferred_lft && 660 !(ifa->ifa_flags & IFA_F_DEPRECATED)) { 661 ifa->ifa_flags |= IFA_F_DEPRECATED; 662 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 663 } 664 } 665 rtnl_unlock(); 666 } 667 668 next_sec = round_jiffies_up(next); 669 next_sched = next; 670 671 /* If rounded timeout is accurate enough, accept it. */ 672 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 673 next_sched = next_sec; 674 675 now = jiffies; 676 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 677 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX)) 678 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX; 679 680 schedule_delayed_work(&check_lifetime_work, next_sched - now); 681 } 682 683 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, 684 __u32 prefered_lft) 685 { 686 unsigned long timeout; 687 688 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); 689 690 timeout = addrconf_timeout_fixup(valid_lft, HZ); 691 if (addrconf_finite_timeout(timeout)) 692 ifa->ifa_valid_lft = timeout; 693 else 694 ifa->ifa_flags |= IFA_F_PERMANENT; 695 696 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 697 if (addrconf_finite_timeout(timeout)) { 698 if (timeout == 0) 699 ifa->ifa_flags |= IFA_F_DEPRECATED; 700 ifa->ifa_preferred_lft = timeout; 701 } 702 ifa->ifa_tstamp = jiffies; 703 if (!ifa->ifa_cstamp) 704 ifa->ifa_cstamp = ifa->ifa_tstamp; 705 } 706 707 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, 708 __u32 *pvalid_lft, __u32 *pprefered_lft) 709 { 710 struct nlattr *tb[IFA_MAX+1]; 711 struct in_ifaddr *ifa; 712 struct ifaddrmsg *ifm; 713 struct net_device *dev; 714 struct in_device *in_dev; 715 int err; 716 717 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 718 if (err < 0) 719 goto errout; 720 721 ifm = nlmsg_data(nlh); 722 err = -EINVAL; 723 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) 724 goto errout; 725 726 dev = __dev_get_by_index(net, ifm->ifa_index); 727 err = -ENODEV; 728 if (dev == NULL) 729 goto errout; 730 731 in_dev = __in_dev_get_rtnl(dev); 732 err = -ENOBUFS; 733 if (in_dev == NULL) 734 goto errout; 735 736 ifa = inet_alloc_ifa(); 737 if (ifa == NULL) 738 /* 739 * A potential indev allocation can be left alive, it stays 740 * assigned to its device and is destroy with it. 741 */ 742 goto errout; 743 744 ipv4_devconf_setall(in_dev); 745 in_dev_hold(in_dev); 746 747 if (tb[IFA_ADDRESS] == NULL) 748 tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 749 750 INIT_HLIST_NODE(&ifa->hash); 751 ifa->ifa_prefixlen = ifm->ifa_prefixlen; 752 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 753 ifa->ifa_flags = ifm->ifa_flags; 754 ifa->ifa_scope = ifm->ifa_scope; 755 ifa->ifa_dev = in_dev; 756 757 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); 758 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); 759 760 if (tb[IFA_BROADCAST]) 761 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); 762 763 if (tb[IFA_LABEL]) 764 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 765 else 766 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 767 768 if (tb[IFA_CACHEINFO]) { 769 struct ifa_cacheinfo *ci; 770 771 ci = nla_data(tb[IFA_CACHEINFO]); 772 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { 773 err = -EINVAL; 774 goto errout; 775 } 776 *pvalid_lft = ci->ifa_valid; 777 *pprefered_lft = ci->ifa_prefered; 778 } 779 780 return ifa; 781 782 errout: 783 return ERR_PTR(err); 784 } 785 786 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) 787 { 788 struct in_device *in_dev = ifa->ifa_dev; 789 struct in_ifaddr *ifa1, **ifap; 790 791 if (!ifa->ifa_local) 792 return NULL; 793 794 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 795 ifap = &ifa1->ifa_next) { 796 if (ifa1->ifa_mask == ifa->ifa_mask && 797 inet_ifa_match(ifa1->ifa_address, ifa) && 798 ifa1->ifa_local == ifa->ifa_local) 799 return ifa1; 800 } 801 return NULL; 802 } 803 804 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 805 { 806 struct net *net = sock_net(skb->sk); 807 struct in_ifaddr *ifa; 808 struct in_ifaddr *ifa_existing; 809 __u32 valid_lft = INFINITY_LIFE_TIME; 810 __u32 prefered_lft = INFINITY_LIFE_TIME; 811 812 ASSERT_RTNL(); 813 814 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft); 815 if (IS_ERR(ifa)) 816 return PTR_ERR(ifa); 817 818 ifa_existing = find_matching_ifa(ifa); 819 if (!ifa_existing) { 820 /* It would be best to check for !NLM_F_CREATE here but 821 * userspace alreay relies on not having to provide this. 822 */ 823 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 824 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid); 825 } else { 826 inet_free_ifa(ifa); 827 828 if (nlh->nlmsg_flags & NLM_F_EXCL || 829 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 830 return -EEXIST; 831 ifa = ifa_existing; 832 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 833 cancel_delayed_work(&check_lifetime_work); 834 schedule_delayed_work(&check_lifetime_work, 0); 835 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); 836 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 837 } 838 return 0; 839 } 840 841 /* 842 * Determine a default network mask, based on the IP address. 843 */ 844 845 static int inet_abc_len(__be32 addr) 846 { 847 int rc = -1; /* Something else, probably a multicast. */ 848 849 if (ipv4_is_zeronet(addr)) 850 rc = 0; 851 else { 852 __u32 haddr = ntohl(addr); 853 854 if (IN_CLASSA(haddr)) 855 rc = 8; 856 else if (IN_CLASSB(haddr)) 857 rc = 16; 858 else if (IN_CLASSC(haddr)) 859 rc = 24; 860 } 861 862 return rc; 863 } 864 865 866 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) 867 { 868 struct ifreq ifr; 869 struct sockaddr_in sin_orig; 870 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; 871 struct in_device *in_dev; 872 struct in_ifaddr **ifap = NULL; 873 struct in_ifaddr *ifa = NULL; 874 struct net_device *dev; 875 char *colon; 876 int ret = -EFAULT; 877 int tryaddrmatch = 0; 878 879 /* 880 * Fetch the caller's info block into kernel space 881 */ 882 883 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 884 goto out; 885 ifr.ifr_name[IFNAMSIZ - 1] = 0; 886 887 /* save original address for comparison */ 888 memcpy(&sin_orig, sin, sizeof(*sin)); 889 890 colon = strchr(ifr.ifr_name, ':'); 891 if (colon) 892 *colon = 0; 893 894 dev_load(net, ifr.ifr_name); 895 896 switch (cmd) { 897 case SIOCGIFADDR: /* Get interface address */ 898 case SIOCGIFBRDADDR: /* Get the broadcast address */ 899 case SIOCGIFDSTADDR: /* Get the destination address */ 900 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 901 /* Note that these ioctls will not sleep, 902 so that we do not impose a lock. 903 One day we will be forced to put shlock here (I mean SMP) 904 */ 905 tryaddrmatch = (sin_orig.sin_family == AF_INET); 906 memset(sin, 0, sizeof(*sin)); 907 sin->sin_family = AF_INET; 908 break; 909 910 case SIOCSIFFLAGS: 911 ret = -EPERM; 912 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 913 goto out; 914 break; 915 case SIOCSIFADDR: /* Set interface address (and family) */ 916 case SIOCSIFBRDADDR: /* Set the broadcast address */ 917 case SIOCSIFDSTADDR: /* Set the destination address */ 918 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 919 ret = -EPERM; 920 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 921 goto out; 922 ret = -EINVAL; 923 if (sin->sin_family != AF_INET) 924 goto out; 925 break; 926 default: 927 ret = -EINVAL; 928 goto out; 929 } 930 931 rtnl_lock(); 932 933 ret = -ENODEV; 934 dev = __dev_get_by_name(net, ifr.ifr_name); 935 if (!dev) 936 goto done; 937 938 if (colon) 939 *colon = ':'; 940 941 in_dev = __in_dev_get_rtnl(dev); 942 if (in_dev) { 943 if (tryaddrmatch) { 944 /* Matthias Andree */ 945 /* compare label and address (4.4BSD style) */ 946 /* note: we only do this for a limited set of ioctls 947 and only if the original address family was AF_INET. 948 This is checked above. */ 949 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 950 ifap = &ifa->ifa_next) { 951 if (!strcmp(ifr.ifr_name, ifa->ifa_label) && 952 sin_orig.sin_addr.s_addr == 953 ifa->ifa_local) { 954 break; /* found */ 955 } 956 } 957 } 958 /* we didn't get a match, maybe the application is 959 4.3BSD-style and passed in junk so we fall back to 960 comparing just the label */ 961 if (!ifa) { 962 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 963 ifap = &ifa->ifa_next) 964 if (!strcmp(ifr.ifr_name, ifa->ifa_label)) 965 break; 966 } 967 } 968 969 ret = -EADDRNOTAVAIL; 970 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 971 goto done; 972 973 switch (cmd) { 974 case SIOCGIFADDR: /* Get interface address */ 975 sin->sin_addr.s_addr = ifa->ifa_local; 976 goto rarok; 977 978 case SIOCGIFBRDADDR: /* Get the broadcast address */ 979 sin->sin_addr.s_addr = ifa->ifa_broadcast; 980 goto rarok; 981 982 case SIOCGIFDSTADDR: /* Get the destination address */ 983 sin->sin_addr.s_addr = ifa->ifa_address; 984 goto rarok; 985 986 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 987 sin->sin_addr.s_addr = ifa->ifa_mask; 988 goto rarok; 989 990 case SIOCSIFFLAGS: 991 if (colon) { 992 ret = -EADDRNOTAVAIL; 993 if (!ifa) 994 break; 995 ret = 0; 996 if (!(ifr.ifr_flags & IFF_UP)) 997 inet_del_ifa(in_dev, ifap, 1); 998 break; 999 } 1000 ret = dev_change_flags(dev, ifr.ifr_flags); 1001 break; 1002 1003 case SIOCSIFADDR: /* Set interface address (and family) */ 1004 ret = -EINVAL; 1005 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1006 break; 1007 1008 if (!ifa) { 1009 ret = -ENOBUFS; 1010 ifa = inet_alloc_ifa(); 1011 if (!ifa) 1012 break; 1013 INIT_HLIST_NODE(&ifa->hash); 1014 if (colon) 1015 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); 1016 else 1017 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1018 } else { 1019 ret = 0; 1020 if (ifa->ifa_local == sin->sin_addr.s_addr) 1021 break; 1022 inet_del_ifa(in_dev, ifap, 0); 1023 ifa->ifa_broadcast = 0; 1024 ifa->ifa_scope = 0; 1025 } 1026 1027 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 1028 1029 if (!(dev->flags & IFF_POINTOPOINT)) { 1030 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 1031 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 1032 if ((dev->flags & IFF_BROADCAST) && 1033 ifa->ifa_prefixlen < 31) 1034 ifa->ifa_broadcast = ifa->ifa_address | 1035 ~ifa->ifa_mask; 1036 } else { 1037 ifa->ifa_prefixlen = 32; 1038 ifa->ifa_mask = inet_make_mask(32); 1039 } 1040 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 1041 ret = inet_set_ifa(dev, ifa); 1042 break; 1043 1044 case SIOCSIFBRDADDR: /* Set the broadcast address */ 1045 ret = 0; 1046 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 1047 inet_del_ifa(in_dev, ifap, 0); 1048 ifa->ifa_broadcast = sin->sin_addr.s_addr; 1049 inet_insert_ifa(ifa); 1050 } 1051 break; 1052 1053 case SIOCSIFDSTADDR: /* Set the destination address */ 1054 ret = 0; 1055 if (ifa->ifa_address == sin->sin_addr.s_addr) 1056 break; 1057 ret = -EINVAL; 1058 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1059 break; 1060 ret = 0; 1061 inet_del_ifa(in_dev, ifap, 0); 1062 ifa->ifa_address = sin->sin_addr.s_addr; 1063 inet_insert_ifa(ifa); 1064 break; 1065 1066 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 1067 1068 /* 1069 * The mask we set must be legal. 1070 */ 1071 ret = -EINVAL; 1072 if (bad_mask(sin->sin_addr.s_addr, 0)) 1073 break; 1074 ret = 0; 1075 if (ifa->ifa_mask != sin->sin_addr.s_addr) { 1076 __be32 old_mask = ifa->ifa_mask; 1077 inet_del_ifa(in_dev, ifap, 0); 1078 ifa->ifa_mask = sin->sin_addr.s_addr; 1079 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 1080 1081 /* See if current broadcast address matches 1082 * with current netmask, then recalculate 1083 * the broadcast address. Otherwise it's a 1084 * funny address, so don't touch it since 1085 * the user seems to know what (s)he's doing... 1086 */ 1087 if ((dev->flags & IFF_BROADCAST) && 1088 (ifa->ifa_prefixlen < 31) && 1089 (ifa->ifa_broadcast == 1090 (ifa->ifa_local|~old_mask))) { 1091 ifa->ifa_broadcast = (ifa->ifa_local | 1092 ~sin->sin_addr.s_addr); 1093 } 1094 inet_insert_ifa(ifa); 1095 } 1096 break; 1097 } 1098 done: 1099 rtnl_unlock(); 1100 out: 1101 return ret; 1102 rarok: 1103 rtnl_unlock(); 1104 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; 1105 goto out; 1106 } 1107 1108 static int inet_gifconf(struct net_device *dev, char __user *buf, int len) 1109 { 1110 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1111 struct in_ifaddr *ifa; 1112 struct ifreq ifr; 1113 int done = 0; 1114 1115 if (!in_dev) 1116 goto out; 1117 1118 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1119 if (!buf) { 1120 done += sizeof(ifr); 1121 continue; 1122 } 1123 if (len < (int) sizeof(ifr)) 1124 break; 1125 memset(&ifr, 0, sizeof(struct ifreq)); 1126 if (ifa->ifa_label) 1127 strcpy(ifr.ifr_name, ifa->ifa_label); 1128 else 1129 strcpy(ifr.ifr_name, dev->name); 1130 1131 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 1132 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 1133 ifa->ifa_local; 1134 1135 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { 1136 done = -EFAULT; 1137 break; 1138 } 1139 buf += sizeof(struct ifreq); 1140 len -= sizeof(struct ifreq); 1141 done += sizeof(struct ifreq); 1142 } 1143 out: 1144 return done; 1145 } 1146 1147 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 1148 { 1149 __be32 addr = 0; 1150 struct in_device *in_dev; 1151 struct net *net = dev_net(dev); 1152 1153 rcu_read_lock(); 1154 in_dev = __in_dev_get_rcu(dev); 1155 if (!in_dev) 1156 goto no_in_dev; 1157 1158 for_primary_ifa(in_dev) { 1159 if (ifa->ifa_scope > scope) 1160 continue; 1161 if (!dst || inet_ifa_match(dst, ifa)) { 1162 addr = ifa->ifa_local; 1163 break; 1164 } 1165 if (!addr) 1166 addr = ifa->ifa_local; 1167 } endfor_ifa(in_dev); 1168 1169 if (addr) 1170 goto out_unlock; 1171 no_in_dev: 1172 1173 /* Not loopback addresses on loopback should be preferred 1174 in this case. It is importnat that lo is the first interface 1175 in dev_base list. 1176 */ 1177 for_each_netdev_rcu(net, dev) { 1178 in_dev = __in_dev_get_rcu(dev); 1179 if (!in_dev) 1180 continue; 1181 1182 for_primary_ifa(in_dev) { 1183 if (ifa->ifa_scope != RT_SCOPE_LINK && 1184 ifa->ifa_scope <= scope) { 1185 addr = ifa->ifa_local; 1186 goto out_unlock; 1187 } 1188 } endfor_ifa(in_dev); 1189 } 1190 out_unlock: 1191 rcu_read_unlock(); 1192 return addr; 1193 } 1194 EXPORT_SYMBOL(inet_select_addr); 1195 1196 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 1197 __be32 local, int scope) 1198 { 1199 int same = 0; 1200 __be32 addr = 0; 1201 1202 for_ifa(in_dev) { 1203 if (!addr && 1204 (local == ifa->ifa_local || !local) && 1205 ifa->ifa_scope <= scope) { 1206 addr = ifa->ifa_local; 1207 if (same) 1208 break; 1209 } 1210 if (!same) { 1211 same = (!local || inet_ifa_match(local, ifa)) && 1212 (!dst || inet_ifa_match(dst, ifa)); 1213 if (same && addr) { 1214 if (local || !dst) 1215 break; 1216 /* Is the selected addr into dst subnet? */ 1217 if (inet_ifa_match(addr, ifa)) 1218 break; 1219 /* No, then can we use new local src? */ 1220 if (ifa->ifa_scope <= scope) { 1221 addr = ifa->ifa_local; 1222 break; 1223 } 1224 /* search for large dst subnet for addr */ 1225 same = 0; 1226 } 1227 } 1228 } endfor_ifa(in_dev); 1229 1230 return same ? addr : 0; 1231 } 1232 1233 /* 1234 * Confirm that local IP address exists using wildcards: 1235 * - in_dev: only on this interface, 0=any interface 1236 * - dst: only in the same subnet as dst, 0=any dst 1237 * - local: address, 0=autoselect the local address 1238 * - scope: maximum allowed scope value for the local address 1239 */ 1240 __be32 inet_confirm_addr(struct in_device *in_dev, 1241 __be32 dst, __be32 local, int scope) 1242 { 1243 __be32 addr = 0; 1244 struct net_device *dev; 1245 struct net *net; 1246 1247 if (scope != RT_SCOPE_LINK) 1248 return confirm_addr_indev(in_dev, dst, local, scope); 1249 1250 net = dev_net(in_dev->dev); 1251 rcu_read_lock(); 1252 for_each_netdev_rcu(net, dev) { 1253 in_dev = __in_dev_get_rcu(dev); 1254 if (in_dev) { 1255 addr = confirm_addr_indev(in_dev, dst, local, scope); 1256 if (addr) 1257 break; 1258 } 1259 } 1260 rcu_read_unlock(); 1261 1262 return addr; 1263 } 1264 EXPORT_SYMBOL(inet_confirm_addr); 1265 1266 /* 1267 * Device notifier 1268 */ 1269 1270 int register_inetaddr_notifier(struct notifier_block *nb) 1271 { 1272 return blocking_notifier_chain_register(&inetaddr_chain, nb); 1273 } 1274 EXPORT_SYMBOL(register_inetaddr_notifier); 1275 1276 int unregister_inetaddr_notifier(struct notifier_block *nb) 1277 { 1278 return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 1279 } 1280 EXPORT_SYMBOL(unregister_inetaddr_notifier); 1281 1282 /* Rename ifa_labels for a device name change. Make some effort to preserve 1283 * existing alias numbering and to create unique labels if possible. 1284 */ 1285 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 1286 { 1287 struct in_ifaddr *ifa; 1288 int named = 0; 1289 1290 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1291 char old[IFNAMSIZ], *dot; 1292 1293 memcpy(old, ifa->ifa_label, IFNAMSIZ); 1294 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1295 if (named++ == 0) 1296 goto skip; 1297 dot = strchr(old, ':'); 1298 if (dot == NULL) { 1299 sprintf(old, ":%d", named); 1300 dot = old; 1301 } 1302 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) 1303 strcat(ifa->ifa_label, dot); 1304 else 1305 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 1306 skip: 1307 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 1308 } 1309 } 1310 1311 static bool inetdev_valid_mtu(unsigned int mtu) 1312 { 1313 return mtu >= 68; 1314 } 1315 1316 static void inetdev_send_gratuitous_arp(struct net_device *dev, 1317 struct in_device *in_dev) 1318 1319 { 1320 struct in_ifaddr *ifa; 1321 1322 for (ifa = in_dev->ifa_list; ifa; 1323 ifa = ifa->ifa_next) { 1324 arp_send(ARPOP_REQUEST, ETH_P_ARP, 1325 ifa->ifa_local, dev, 1326 ifa->ifa_local, NULL, 1327 dev->dev_addr, NULL); 1328 } 1329 } 1330 1331 /* Called only under RTNL semaphore */ 1332 1333 static int inetdev_event(struct notifier_block *this, unsigned long event, 1334 void *ptr) 1335 { 1336 struct net_device *dev = ptr; 1337 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1338 1339 ASSERT_RTNL(); 1340 1341 if (!in_dev) { 1342 if (event == NETDEV_REGISTER) { 1343 in_dev = inetdev_init(dev); 1344 if (!in_dev) 1345 return notifier_from_errno(-ENOMEM); 1346 if (dev->flags & IFF_LOOPBACK) { 1347 IN_DEV_CONF_SET(in_dev, NOXFRM, 1); 1348 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); 1349 } 1350 } else if (event == NETDEV_CHANGEMTU) { 1351 /* Re-enabling IP */ 1352 if (inetdev_valid_mtu(dev->mtu)) 1353 in_dev = inetdev_init(dev); 1354 } 1355 goto out; 1356 } 1357 1358 switch (event) { 1359 case NETDEV_REGISTER: 1360 pr_debug("%s: bug\n", __func__); 1361 RCU_INIT_POINTER(dev->ip_ptr, NULL); 1362 break; 1363 case NETDEV_UP: 1364 if (!inetdev_valid_mtu(dev->mtu)) 1365 break; 1366 if (dev->flags & IFF_LOOPBACK) { 1367 struct in_ifaddr *ifa = inet_alloc_ifa(); 1368 1369 if (ifa) { 1370 INIT_HLIST_NODE(&ifa->hash); 1371 ifa->ifa_local = 1372 ifa->ifa_address = htonl(INADDR_LOOPBACK); 1373 ifa->ifa_prefixlen = 8; 1374 ifa->ifa_mask = inet_make_mask(8); 1375 in_dev_hold(in_dev); 1376 ifa->ifa_dev = in_dev; 1377 ifa->ifa_scope = RT_SCOPE_HOST; 1378 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1379 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, 1380 INFINITY_LIFE_TIME); 1381 inet_insert_ifa(ifa); 1382 } 1383 } 1384 ip_mc_up(in_dev); 1385 /* fall through */ 1386 case NETDEV_CHANGEADDR: 1387 if (!IN_DEV_ARP_NOTIFY(in_dev)) 1388 break; 1389 /* fall through */ 1390 case NETDEV_NOTIFY_PEERS: 1391 /* Send gratuitous ARP to notify of link change */ 1392 inetdev_send_gratuitous_arp(dev, in_dev); 1393 break; 1394 case NETDEV_DOWN: 1395 ip_mc_down(in_dev); 1396 break; 1397 case NETDEV_PRE_TYPE_CHANGE: 1398 ip_mc_unmap(in_dev); 1399 break; 1400 case NETDEV_POST_TYPE_CHANGE: 1401 ip_mc_remap(in_dev); 1402 break; 1403 case NETDEV_CHANGEMTU: 1404 if (inetdev_valid_mtu(dev->mtu)) 1405 break; 1406 /* disable IP when MTU is not enough */ 1407 case NETDEV_UNREGISTER: 1408 inetdev_destroy(in_dev); 1409 break; 1410 case NETDEV_CHANGENAME: 1411 /* Do not notify about label change, this event is 1412 * not interesting to applications using netlink. 1413 */ 1414 inetdev_changename(dev, in_dev); 1415 1416 devinet_sysctl_unregister(in_dev); 1417 devinet_sysctl_register(in_dev); 1418 break; 1419 } 1420 out: 1421 return NOTIFY_DONE; 1422 } 1423 1424 static struct notifier_block ip_netdev_notifier = { 1425 .notifier_call = inetdev_event, 1426 }; 1427 1428 static size_t inet_nlmsg_size(void) 1429 { 1430 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1431 + nla_total_size(4) /* IFA_ADDRESS */ 1432 + nla_total_size(4) /* IFA_LOCAL */ 1433 + nla_total_size(4) /* IFA_BROADCAST */ 1434 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ 1435 } 1436 1437 static inline u32 cstamp_delta(unsigned long cstamp) 1438 { 1439 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 1440 } 1441 1442 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 1443 unsigned long tstamp, u32 preferred, u32 valid) 1444 { 1445 struct ifa_cacheinfo ci; 1446 1447 ci.cstamp = cstamp_delta(cstamp); 1448 ci.tstamp = cstamp_delta(tstamp); 1449 ci.ifa_prefered = preferred; 1450 ci.ifa_valid = valid; 1451 1452 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 1453 } 1454 1455 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1456 u32 portid, u32 seq, int event, unsigned int flags) 1457 { 1458 struct ifaddrmsg *ifm; 1459 struct nlmsghdr *nlh; 1460 u32 preferred, valid; 1461 1462 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); 1463 if (nlh == NULL) 1464 return -EMSGSIZE; 1465 1466 ifm = nlmsg_data(nlh); 1467 ifm->ifa_family = AF_INET; 1468 ifm->ifa_prefixlen = ifa->ifa_prefixlen; 1469 ifm->ifa_flags = ifa->ifa_flags; 1470 ifm->ifa_scope = ifa->ifa_scope; 1471 ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 1472 1473 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { 1474 preferred = ifa->ifa_preferred_lft; 1475 valid = ifa->ifa_valid_lft; 1476 if (preferred != INFINITY_LIFE_TIME) { 1477 long tval = (jiffies - ifa->ifa_tstamp) / HZ; 1478 1479 if (preferred > tval) 1480 preferred -= tval; 1481 else 1482 preferred = 0; 1483 if (valid != INFINITY_LIFE_TIME) { 1484 if (valid > tval) 1485 valid -= tval; 1486 else 1487 valid = 0; 1488 } 1489 } 1490 } else { 1491 preferred = INFINITY_LIFE_TIME; 1492 valid = INFINITY_LIFE_TIME; 1493 } 1494 if ((ifa->ifa_address && 1495 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) || 1496 (ifa->ifa_local && 1497 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) || 1498 (ifa->ifa_broadcast && 1499 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || 1500 (ifa->ifa_label[0] && 1501 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || 1502 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, 1503 preferred, valid)) 1504 goto nla_put_failure; 1505 1506 return nlmsg_end(skb, nlh); 1507 1508 nla_put_failure: 1509 nlmsg_cancel(skb, nlh); 1510 return -EMSGSIZE; 1511 } 1512 1513 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1514 { 1515 struct net *net = sock_net(skb->sk); 1516 int h, s_h; 1517 int idx, s_idx; 1518 int ip_idx, s_ip_idx; 1519 struct net_device *dev; 1520 struct in_device *in_dev; 1521 struct in_ifaddr *ifa; 1522 struct hlist_head *head; 1523 1524 s_h = cb->args[0]; 1525 s_idx = idx = cb->args[1]; 1526 s_ip_idx = ip_idx = cb->args[2]; 1527 1528 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1529 idx = 0; 1530 head = &net->dev_index_head[h]; 1531 rcu_read_lock(); 1532 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1533 net->dev_base_seq; 1534 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1535 if (idx < s_idx) 1536 goto cont; 1537 if (h > s_h || idx > s_idx) 1538 s_ip_idx = 0; 1539 in_dev = __in_dev_get_rcu(dev); 1540 if (!in_dev) 1541 goto cont; 1542 1543 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 1544 ifa = ifa->ifa_next, ip_idx++) { 1545 if (ip_idx < s_ip_idx) 1546 continue; 1547 if (inet_fill_ifaddr(skb, ifa, 1548 NETLINK_CB(cb->skb).portid, 1549 cb->nlh->nlmsg_seq, 1550 RTM_NEWADDR, NLM_F_MULTI) <= 0) { 1551 rcu_read_unlock(); 1552 goto done; 1553 } 1554 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1555 } 1556 cont: 1557 idx++; 1558 } 1559 rcu_read_unlock(); 1560 } 1561 1562 done: 1563 cb->args[0] = h; 1564 cb->args[1] = idx; 1565 cb->args[2] = ip_idx; 1566 1567 return skb->len; 1568 } 1569 1570 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, 1571 u32 portid) 1572 { 1573 struct sk_buff *skb; 1574 u32 seq = nlh ? nlh->nlmsg_seq : 0; 1575 int err = -ENOBUFS; 1576 struct net *net; 1577 1578 net = dev_net(ifa->ifa_dev->dev); 1579 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1580 if (skb == NULL) 1581 goto errout; 1582 1583 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0); 1584 if (err < 0) { 1585 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1586 WARN_ON(err == -EMSGSIZE); 1587 kfree_skb(skb); 1588 goto errout; 1589 } 1590 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1591 return; 1592 errout: 1593 if (err < 0) 1594 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); 1595 } 1596 1597 static size_t inet_get_link_af_size(const struct net_device *dev) 1598 { 1599 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1600 1601 if (!in_dev) 1602 return 0; 1603 1604 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ 1605 } 1606 1607 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 1608 { 1609 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1610 struct nlattr *nla; 1611 int i; 1612 1613 if (!in_dev) 1614 return -ENODATA; 1615 1616 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); 1617 if (nla == NULL) 1618 return -EMSGSIZE; 1619 1620 for (i = 0; i < IPV4_DEVCONF_MAX; i++) 1621 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; 1622 1623 return 0; 1624 } 1625 1626 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { 1627 [IFLA_INET_CONF] = { .type = NLA_NESTED }, 1628 }; 1629 1630 static int inet_validate_link_af(const struct net_device *dev, 1631 const struct nlattr *nla) 1632 { 1633 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1634 int err, rem; 1635 1636 if (dev && !__in_dev_get_rtnl(dev)) 1637 return -EAFNOSUPPORT; 1638 1639 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); 1640 if (err < 0) 1641 return err; 1642 1643 if (tb[IFLA_INET_CONF]) { 1644 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { 1645 int cfgid = nla_type(a); 1646 1647 if (nla_len(a) < 4) 1648 return -EINVAL; 1649 1650 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) 1651 return -EINVAL; 1652 } 1653 } 1654 1655 return 0; 1656 } 1657 1658 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) 1659 { 1660 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1661 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1662 int rem; 1663 1664 if (!in_dev) 1665 return -EAFNOSUPPORT; 1666 1667 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) 1668 BUG(); 1669 1670 if (tb[IFLA_INET_CONF]) { 1671 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) 1672 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); 1673 } 1674 1675 return 0; 1676 } 1677 1678 static int inet_netconf_msgsize_devconf(int type) 1679 { 1680 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1681 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1682 1683 /* type -1 is used for ALL */ 1684 if (type == -1 || type == NETCONFA_FORWARDING) 1685 size += nla_total_size(4); 1686 if (type == -1 || type == NETCONFA_RP_FILTER) 1687 size += nla_total_size(4); 1688 if (type == -1 || type == NETCONFA_MC_FORWARDING) 1689 size += nla_total_size(4); 1690 1691 return size; 1692 } 1693 1694 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 1695 struct ipv4_devconf *devconf, u32 portid, 1696 u32 seq, int event, unsigned int flags, 1697 int type) 1698 { 1699 struct nlmsghdr *nlh; 1700 struct netconfmsg *ncm; 1701 1702 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1703 flags); 1704 if (nlh == NULL) 1705 return -EMSGSIZE; 1706 1707 ncm = nlmsg_data(nlh); 1708 ncm->ncm_family = AF_INET; 1709 1710 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 1711 goto nla_put_failure; 1712 1713 /* type -1 is used for ALL */ 1714 if ((type == -1 || type == NETCONFA_FORWARDING) && 1715 nla_put_s32(skb, NETCONFA_FORWARDING, 1716 IPV4_DEVCONF(*devconf, FORWARDING)) < 0) 1717 goto nla_put_failure; 1718 if ((type == -1 || type == NETCONFA_RP_FILTER) && 1719 nla_put_s32(skb, NETCONFA_RP_FILTER, 1720 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) 1721 goto nla_put_failure; 1722 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 1723 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 1724 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) 1725 goto nla_put_failure; 1726 1727 return nlmsg_end(skb, nlh); 1728 1729 nla_put_failure: 1730 nlmsg_cancel(skb, nlh); 1731 return -EMSGSIZE; 1732 } 1733 1734 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex, 1735 struct ipv4_devconf *devconf) 1736 { 1737 struct sk_buff *skb; 1738 int err = -ENOBUFS; 1739 1740 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC); 1741 if (skb == NULL) 1742 goto errout; 1743 1744 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 1745 RTM_NEWNETCONF, 0, type); 1746 if (err < 0) { 1747 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1748 WARN_ON(err == -EMSGSIZE); 1749 kfree_skb(skb); 1750 goto errout; 1751 } 1752 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC); 1753 return; 1754 errout: 1755 if (err < 0) 1756 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); 1757 } 1758 1759 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { 1760 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1761 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 1762 [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, 1763 }; 1764 1765 static int inet_netconf_get_devconf(struct sk_buff *in_skb, 1766 struct nlmsghdr *nlh) 1767 { 1768 struct net *net = sock_net(in_skb->sk); 1769 struct nlattr *tb[NETCONFA_MAX+1]; 1770 struct netconfmsg *ncm; 1771 struct sk_buff *skb; 1772 struct ipv4_devconf *devconf; 1773 struct in_device *in_dev; 1774 struct net_device *dev; 1775 int ifindex; 1776 int err; 1777 1778 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 1779 devconf_ipv4_policy); 1780 if (err < 0) 1781 goto errout; 1782 1783 err = EINVAL; 1784 if (!tb[NETCONFA_IFINDEX]) 1785 goto errout; 1786 1787 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1788 switch (ifindex) { 1789 case NETCONFA_IFINDEX_ALL: 1790 devconf = net->ipv4.devconf_all; 1791 break; 1792 case NETCONFA_IFINDEX_DEFAULT: 1793 devconf = net->ipv4.devconf_dflt; 1794 break; 1795 default: 1796 dev = __dev_get_by_index(net, ifindex); 1797 if (dev == NULL) 1798 goto errout; 1799 in_dev = __in_dev_get_rtnl(dev); 1800 if (in_dev == NULL) 1801 goto errout; 1802 devconf = &in_dev->cnf; 1803 break; 1804 } 1805 1806 err = -ENOBUFS; 1807 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC); 1808 if (skb == NULL) 1809 goto errout; 1810 1811 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 1812 NETLINK_CB(in_skb).portid, 1813 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1814 -1); 1815 if (err < 0) { 1816 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1817 WARN_ON(err == -EMSGSIZE); 1818 kfree_skb(skb); 1819 goto errout; 1820 } 1821 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1822 errout: 1823 return err; 1824 } 1825 1826 static int inet_netconf_dump_devconf(struct sk_buff *skb, 1827 struct netlink_callback *cb) 1828 { 1829 struct net *net = sock_net(skb->sk); 1830 int h, s_h; 1831 int idx, s_idx; 1832 struct net_device *dev; 1833 struct in_device *in_dev; 1834 struct hlist_head *head; 1835 1836 s_h = cb->args[0]; 1837 s_idx = idx = cb->args[1]; 1838 1839 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1840 idx = 0; 1841 head = &net->dev_index_head[h]; 1842 rcu_read_lock(); 1843 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1844 net->dev_base_seq; 1845 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1846 if (idx < s_idx) 1847 goto cont; 1848 in_dev = __in_dev_get_rcu(dev); 1849 if (!in_dev) 1850 goto cont; 1851 1852 if (inet_netconf_fill_devconf(skb, dev->ifindex, 1853 &in_dev->cnf, 1854 NETLINK_CB(cb->skb).portid, 1855 cb->nlh->nlmsg_seq, 1856 RTM_NEWNETCONF, 1857 NLM_F_MULTI, 1858 -1) <= 0) { 1859 rcu_read_unlock(); 1860 goto done; 1861 } 1862 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1863 cont: 1864 idx++; 1865 } 1866 rcu_read_unlock(); 1867 } 1868 if (h == NETDEV_HASHENTRIES) { 1869 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 1870 net->ipv4.devconf_all, 1871 NETLINK_CB(cb->skb).portid, 1872 cb->nlh->nlmsg_seq, 1873 RTM_NEWNETCONF, NLM_F_MULTI, 1874 -1) <= 0) 1875 goto done; 1876 else 1877 h++; 1878 } 1879 if (h == NETDEV_HASHENTRIES + 1) { 1880 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 1881 net->ipv4.devconf_dflt, 1882 NETLINK_CB(cb->skb).portid, 1883 cb->nlh->nlmsg_seq, 1884 RTM_NEWNETCONF, NLM_F_MULTI, 1885 -1) <= 0) 1886 goto done; 1887 else 1888 h++; 1889 } 1890 done: 1891 cb->args[0] = h; 1892 cb->args[1] = idx; 1893 1894 return skb->len; 1895 } 1896 1897 #ifdef CONFIG_SYSCTL 1898 1899 static void devinet_copy_dflt_conf(struct net *net, int i) 1900 { 1901 struct net_device *dev; 1902 1903 rcu_read_lock(); 1904 for_each_netdev_rcu(net, dev) { 1905 struct in_device *in_dev; 1906 1907 in_dev = __in_dev_get_rcu(dev); 1908 if (in_dev && !test_bit(i, in_dev->cnf.state)) 1909 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 1910 } 1911 rcu_read_unlock(); 1912 } 1913 1914 /* called with RTNL locked */ 1915 static void inet_forward_change(struct net *net) 1916 { 1917 struct net_device *dev; 1918 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 1919 1920 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 1921 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 1922 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1923 NETCONFA_IFINDEX_ALL, 1924 net->ipv4.devconf_all); 1925 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1926 NETCONFA_IFINDEX_DEFAULT, 1927 net->ipv4.devconf_dflt); 1928 1929 for_each_netdev(net, dev) { 1930 struct in_device *in_dev; 1931 if (on) 1932 dev_disable_lro(dev); 1933 rcu_read_lock(); 1934 in_dev = __in_dev_get_rcu(dev); 1935 if (in_dev) { 1936 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 1937 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1938 dev->ifindex, &in_dev->cnf); 1939 } 1940 rcu_read_unlock(); 1941 } 1942 } 1943 1944 static int devinet_conf_proc(ctl_table *ctl, int write, 1945 void __user *buffer, 1946 size_t *lenp, loff_t *ppos) 1947 { 1948 int old_value = *(int *)ctl->data; 1949 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1950 int new_value = *(int *)ctl->data; 1951 1952 if (write) { 1953 struct ipv4_devconf *cnf = ctl->extra1; 1954 struct net *net = ctl->extra2; 1955 int i = (int *)ctl->data - cnf->data; 1956 1957 set_bit(i, cnf->state); 1958 1959 if (cnf == net->ipv4.devconf_dflt) 1960 devinet_copy_dflt_conf(net, i); 1961 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || 1962 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) 1963 if ((new_value == 0) && (old_value != 0)) 1964 rt_cache_flush(net); 1965 if (i == IPV4_DEVCONF_RP_FILTER - 1 && 1966 new_value != old_value) { 1967 int ifindex; 1968 1969 if (cnf == net->ipv4.devconf_dflt) 1970 ifindex = NETCONFA_IFINDEX_DEFAULT; 1971 else if (cnf == net->ipv4.devconf_all) 1972 ifindex = NETCONFA_IFINDEX_ALL; 1973 else { 1974 struct in_device *idev = 1975 container_of(cnf, struct in_device, 1976 cnf); 1977 ifindex = idev->dev->ifindex; 1978 } 1979 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER, 1980 ifindex, cnf); 1981 } 1982 } 1983 1984 return ret; 1985 } 1986 1987 static int devinet_sysctl_forward(ctl_table *ctl, int write, 1988 void __user *buffer, 1989 size_t *lenp, loff_t *ppos) 1990 { 1991 int *valp = ctl->data; 1992 int val = *valp; 1993 loff_t pos = *ppos; 1994 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1995 1996 if (write && *valp != val) { 1997 struct net *net = ctl->extra2; 1998 1999 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { 2000 if (!rtnl_trylock()) { 2001 /* Restore the original values before restarting */ 2002 *valp = val; 2003 *ppos = pos; 2004 return restart_syscall(); 2005 } 2006 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { 2007 inet_forward_change(net); 2008 } else { 2009 struct ipv4_devconf *cnf = ctl->extra1; 2010 struct in_device *idev = 2011 container_of(cnf, struct in_device, cnf); 2012 if (*valp) 2013 dev_disable_lro(idev->dev); 2014 inet_netconf_notify_devconf(net, 2015 NETCONFA_FORWARDING, 2016 idev->dev->ifindex, 2017 cnf); 2018 } 2019 rtnl_unlock(); 2020 rt_cache_flush(net); 2021 } else 2022 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 2023 NETCONFA_IFINDEX_DEFAULT, 2024 net->ipv4.devconf_dflt); 2025 } 2026 2027 return ret; 2028 } 2029 2030 static int ipv4_doint_and_flush(ctl_table *ctl, int write, 2031 void __user *buffer, 2032 size_t *lenp, loff_t *ppos) 2033 { 2034 int *valp = ctl->data; 2035 int val = *valp; 2036 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2037 struct net *net = ctl->extra2; 2038 2039 if (write && *valp != val) 2040 rt_cache_flush(net); 2041 2042 return ret; 2043 } 2044 2045 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ 2046 { \ 2047 .procname = name, \ 2048 .data = ipv4_devconf.data + \ 2049 IPV4_DEVCONF_ ## attr - 1, \ 2050 .maxlen = sizeof(int), \ 2051 .mode = mval, \ 2052 .proc_handler = proc, \ 2053 .extra1 = &ipv4_devconf, \ 2054 } 2055 2056 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 2057 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) 2058 2059 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 2060 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) 2061 2062 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ 2063 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) 2064 2065 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 2066 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) 2067 2068 static struct devinet_sysctl_table { 2069 struct ctl_table_header *sysctl_header; 2070 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; 2071 } devinet_sysctl = { 2072 .devinet_vars = { 2073 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 2074 devinet_sysctl_forward), 2075 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 2076 2077 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 2078 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 2079 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 2080 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 2081 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 2082 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 2083 "accept_source_route"), 2084 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), 2085 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), 2086 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 2087 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 2088 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 2089 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 2090 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 2091 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 2092 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 2093 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 2094 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 2095 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), 2096 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), 2097 2098 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 2099 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 2100 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, 2101 "force_igmp_version"), 2102 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 2103 "promote_secondaries"), 2104 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, 2105 "route_localnet"), 2106 }, 2107 }; 2108 2109 static int __devinet_sysctl_register(struct net *net, char *dev_name, 2110 struct ipv4_devconf *p) 2111 { 2112 int i; 2113 struct devinet_sysctl_table *t; 2114 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; 2115 2116 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 2117 if (!t) 2118 goto out; 2119 2120 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 2121 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 2122 t->devinet_vars[i].extra1 = p; 2123 t->devinet_vars[i].extra2 = net; 2124 } 2125 2126 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); 2127 2128 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); 2129 if (!t->sysctl_header) 2130 goto free; 2131 2132 p->sysctl = t; 2133 return 0; 2134 2135 free: 2136 kfree(t); 2137 out: 2138 return -ENOBUFS; 2139 } 2140 2141 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) 2142 { 2143 struct devinet_sysctl_table *t = cnf->sysctl; 2144 2145 if (t == NULL) 2146 return; 2147 2148 cnf->sysctl = NULL; 2149 unregister_net_sysctl_table(t->sysctl_header); 2150 kfree(t); 2151 } 2152 2153 static void devinet_sysctl_register(struct in_device *idev) 2154 { 2155 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL); 2156 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, 2157 &idev->cnf); 2158 } 2159 2160 static void devinet_sysctl_unregister(struct in_device *idev) 2161 { 2162 __devinet_sysctl_unregister(&idev->cnf); 2163 neigh_sysctl_unregister(idev->arp_parms); 2164 } 2165 2166 static struct ctl_table ctl_forward_entry[] = { 2167 { 2168 .procname = "ip_forward", 2169 .data = &ipv4_devconf.data[ 2170 IPV4_DEVCONF_FORWARDING - 1], 2171 .maxlen = sizeof(int), 2172 .mode = 0644, 2173 .proc_handler = devinet_sysctl_forward, 2174 .extra1 = &ipv4_devconf, 2175 .extra2 = &init_net, 2176 }, 2177 { }, 2178 }; 2179 #endif 2180 2181 static __net_init int devinet_init_net(struct net *net) 2182 { 2183 int err; 2184 struct ipv4_devconf *all, *dflt; 2185 #ifdef CONFIG_SYSCTL 2186 struct ctl_table *tbl = ctl_forward_entry; 2187 struct ctl_table_header *forw_hdr; 2188 #endif 2189 2190 err = -ENOMEM; 2191 all = &ipv4_devconf; 2192 dflt = &ipv4_devconf_dflt; 2193 2194 if (!net_eq(net, &init_net)) { 2195 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); 2196 if (all == NULL) 2197 goto err_alloc_all; 2198 2199 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 2200 if (dflt == NULL) 2201 goto err_alloc_dflt; 2202 2203 #ifdef CONFIG_SYSCTL 2204 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); 2205 if (tbl == NULL) 2206 goto err_alloc_ctl; 2207 2208 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; 2209 tbl[0].extra1 = all; 2210 tbl[0].extra2 = net; 2211 #endif 2212 } 2213 2214 #ifdef CONFIG_SYSCTL 2215 err = __devinet_sysctl_register(net, "all", all); 2216 if (err < 0) 2217 goto err_reg_all; 2218 2219 err = __devinet_sysctl_register(net, "default", dflt); 2220 if (err < 0) 2221 goto err_reg_dflt; 2222 2223 err = -ENOMEM; 2224 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); 2225 if (forw_hdr == NULL) 2226 goto err_reg_ctl; 2227 net->ipv4.forw_hdr = forw_hdr; 2228 #endif 2229 2230 net->ipv4.devconf_all = all; 2231 net->ipv4.devconf_dflt = dflt; 2232 return 0; 2233 2234 #ifdef CONFIG_SYSCTL 2235 err_reg_ctl: 2236 __devinet_sysctl_unregister(dflt); 2237 err_reg_dflt: 2238 __devinet_sysctl_unregister(all); 2239 err_reg_all: 2240 if (tbl != ctl_forward_entry) 2241 kfree(tbl); 2242 err_alloc_ctl: 2243 #endif 2244 if (dflt != &ipv4_devconf_dflt) 2245 kfree(dflt); 2246 err_alloc_dflt: 2247 if (all != &ipv4_devconf) 2248 kfree(all); 2249 err_alloc_all: 2250 return err; 2251 } 2252 2253 static __net_exit void devinet_exit_net(struct net *net) 2254 { 2255 #ifdef CONFIG_SYSCTL 2256 struct ctl_table *tbl; 2257 2258 tbl = net->ipv4.forw_hdr->ctl_table_arg; 2259 unregister_net_sysctl_table(net->ipv4.forw_hdr); 2260 __devinet_sysctl_unregister(net->ipv4.devconf_dflt); 2261 __devinet_sysctl_unregister(net->ipv4.devconf_all); 2262 kfree(tbl); 2263 #endif 2264 kfree(net->ipv4.devconf_dflt); 2265 kfree(net->ipv4.devconf_all); 2266 } 2267 2268 static __net_initdata struct pernet_operations devinet_ops = { 2269 .init = devinet_init_net, 2270 .exit = devinet_exit_net, 2271 }; 2272 2273 static struct rtnl_af_ops inet_af_ops = { 2274 .family = AF_INET, 2275 .fill_link_af = inet_fill_link_af, 2276 .get_link_af_size = inet_get_link_af_size, 2277 .validate_link_af = inet_validate_link_af, 2278 .set_link_af = inet_set_link_af, 2279 }; 2280 2281 void __init devinet_init(void) 2282 { 2283 int i; 2284 2285 for (i = 0; i < IN4_ADDR_HSIZE; i++) 2286 INIT_HLIST_HEAD(&inet_addr_lst[i]); 2287 2288 register_pernet_subsys(&devinet_ops); 2289 2290 register_gifconf(PF_INET, inet_gifconf); 2291 register_netdevice_notifier(&ip_netdev_notifier); 2292 2293 schedule_delayed_work(&check_lifetime_work, 0); 2294 2295 rtnl_af_register(&inet_af_ops); 2296 2297 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); 2298 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); 2299 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); 2300 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, 2301 inet_netconf_dump_devconf, NULL); 2302 } 2303 2304