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 static DEFINE_SPINLOCK(inet_addr_hash_lock); 110 111 static u32 inet_addr_hash(struct net *net, __be32 addr) 112 { 113 u32 val = (__force u32) addr ^ net_hash_mix(net); 114 115 return hash_32(val, IN4_ADDR_HSIZE_SHIFT); 116 } 117 118 static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) 119 { 120 u32 hash = inet_addr_hash(net, ifa->ifa_local); 121 122 spin_lock(&inet_addr_hash_lock); 123 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); 124 spin_unlock(&inet_addr_hash_lock); 125 } 126 127 static void inet_hash_remove(struct in_ifaddr *ifa) 128 { 129 spin_lock(&inet_addr_hash_lock); 130 hlist_del_init_rcu(&ifa->hash); 131 spin_unlock(&inet_addr_hash_lock); 132 } 133 134 /** 135 * __ip_dev_find - find the first device with a given source address. 136 * @net: the net namespace 137 * @addr: the source address 138 * @devref: if true, take a reference on the found device 139 * 140 * If a caller uses devref=false, it should be protected by RCU, or RTNL 141 */ 142 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) 143 { 144 u32 hash = inet_addr_hash(net, addr); 145 struct net_device *result = NULL; 146 struct in_ifaddr *ifa; 147 148 rcu_read_lock(); 149 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) { 150 if (ifa->ifa_local == addr) { 151 struct net_device *dev = ifa->ifa_dev->dev; 152 153 if (!net_eq(dev_net(dev), net)) 154 continue; 155 result = dev; 156 break; 157 } 158 } 159 if (!result) { 160 struct flowi4 fl4 = { .daddr = addr }; 161 struct fib_result res = { 0 }; 162 struct fib_table *local; 163 164 /* Fallback to FIB local table so that communication 165 * over loopback subnets work. 166 */ 167 local = fib_get_table(net, RT_TABLE_LOCAL); 168 if (local && 169 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) && 170 res.type == RTN_LOCAL) 171 result = FIB_RES_DEV(res); 172 } 173 if (result && devref) 174 dev_hold(result); 175 rcu_read_unlock(); 176 return result; 177 } 178 EXPORT_SYMBOL(__ip_dev_find); 179 180 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); 181 182 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); 183 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 184 int destroy); 185 #ifdef CONFIG_SYSCTL 186 static void devinet_sysctl_register(struct in_device *idev); 187 static void devinet_sysctl_unregister(struct in_device *idev); 188 #else 189 static void devinet_sysctl_register(struct in_device *idev) 190 { 191 } 192 static void devinet_sysctl_unregister(struct in_device *idev) 193 { 194 } 195 #endif 196 197 /* Locks all the inet devices. */ 198 199 static struct in_ifaddr *inet_alloc_ifa(void) 200 { 201 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); 202 } 203 204 static void inet_rcu_free_ifa(struct rcu_head *head) 205 { 206 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); 207 if (ifa->ifa_dev) 208 in_dev_put(ifa->ifa_dev); 209 kfree(ifa); 210 } 211 212 static void inet_free_ifa(struct in_ifaddr *ifa) 213 { 214 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); 215 } 216 217 void in_dev_finish_destroy(struct in_device *idev) 218 { 219 struct net_device *dev = idev->dev; 220 221 WARN_ON(idev->ifa_list); 222 WARN_ON(idev->mc_list); 223 kfree(rcu_dereference_protected(idev->mc_hash, 1)); 224 #ifdef NET_REFCNT_DEBUG 225 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL"); 226 #endif 227 dev_put(dev); 228 if (!idev->dead) 229 pr_err("Freeing alive in_device %p\n", idev); 230 else 231 kfree(idev); 232 } 233 EXPORT_SYMBOL(in_dev_finish_destroy); 234 235 static struct in_device *inetdev_init(struct net_device *dev) 236 { 237 struct in_device *in_dev; 238 239 ASSERT_RTNL(); 240 241 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); 242 if (!in_dev) 243 goto out; 244 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, 245 sizeof(in_dev->cnf)); 246 in_dev->cnf.sysctl = NULL; 247 in_dev->dev = dev; 248 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); 249 if (!in_dev->arp_parms) 250 goto out_kfree; 251 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) 252 dev_disable_lro(dev); 253 /* Reference in_dev->dev */ 254 dev_hold(dev); 255 /* Account for reference dev->ip_ptr (below) */ 256 in_dev_hold(in_dev); 257 258 devinet_sysctl_register(in_dev); 259 ip_mc_init_dev(in_dev); 260 if (dev->flags & IFF_UP) 261 ip_mc_up(in_dev); 262 263 /* we can receive as soon as ip_ptr is set -- do this last */ 264 rcu_assign_pointer(dev->ip_ptr, in_dev); 265 out: 266 return in_dev; 267 out_kfree: 268 kfree(in_dev); 269 in_dev = NULL; 270 goto out; 271 } 272 273 static void in_dev_rcu_put(struct rcu_head *head) 274 { 275 struct in_device *idev = container_of(head, struct in_device, rcu_head); 276 in_dev_put(idev); 277 } 278 279 static void inetdev_destroy(struct in_device *in_dev) 280 { 281 struct in_ifaddr *ifa; 282 struct net_device *dev; 283 284 ASSERT_RTNL(); 285 286 dev = in_dev->dev; 287 288 in_dev->dead = 1; 289 290 ip_mc_destroy_dev(in_dev); 291 292 while ((ifa = in_dev->ifa_list) != NULL) { 293 inet_del_ifa(in_dev, &in_dev->ifa_list, 0); 294 inet_free_ifa(ifa); 295 } 296 297 RCU_INIT_POINTER(dev->ip_ptr, NULL); 298 299 devinet_sysctl_unregister(in_dev); 300 neigh_parms_release(&arp_tbl, in_dev->arp_parms); 301 arp_ifdown(dev); 302 303 call_rcu(&in_dev->rcu_head, in_dev_rcu_put); 304 } 305 306 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) 307 { 308 rcu_read_lock(); 309 for_primary_ifa(in_dev) { 310 if (inet_ifa_match(a, ifa)) { 311 if (!b || inet_ifa_match(b, ifa)) { 312 rcu_read_unlock(); 313 return 1; 314 } 315 } 316 } endfor_ifa(in_dev); 317 rcu_read_unlock(); 318 return 0; 319 } 320 321 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 322 int destroy, struct nlmsghdr *nlh, u32 portid) 323 { 324 struct in_ifaddr *promote = NULL; 325 struct in_ifaddr *ifa, *ifa1 = *ifap; 326 struct in_ifaddr *last_prim = in_dev->ifa_list; 327 struct in_ifaddr *prev_prom = NULL; 328 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); 329 330 ASSERT_RTNL(); 331 332 /* 1. Deleting primary ifaddr forces deletion all secondaries 333 * unless alias promotion is set 334 **/ 335 336 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { 337 struct in_ifaddr **ifap1 = &ifa1->ifa_next; 338 339 while ((ifa = *ifap1) != NULL) { 340 if (!(ifa->ifa_flags & IFA_F_SECONDARY) && 341 ifa1->ifa_scope <= ifa->ifa_scope) 342 last_prim = ifa; 343 344 if (!(ifa->ifa_flags & IFA_F_SECONDARY) || 345 ifa1->ifa_mask != ifa->ifa_mask || 346 !inet_ifa_match(ifa1->ifa_address, ifa)) { 347 ifap1 = &ifa->ifa_next; 348 prev_prom = ifa; 349 continue; 350 } 351 352 if (!do_promote) { 353 inet_hash_remove(ifa); 354 *ifap1 = ifa->ifa_next; 355 356 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid); 357 blocking_notifier_call_chain(&inetaddr_chain, 358 NETDEV_DOWN, ifa); 359 inet_free_ifa(ifa); 360 } else { 361 promote = ifa; 362 break; 363 } 364 } 365 } 366 367 /* On promotion all secondaries from subnet are changing 368 * the primary IP, we must remove all their routes silently 369 * and later to add them back with new prefsrc. Do this 370 * while all addresses are on the device list. 371 */ 372 for (ifa = promote; ifa; ifa = ifa->ifa_next) { 373 if (ifa1->ifa_mask == ifa->ifa_mask && 374 inet_ifa_match(ifa1->ifa_address, ifa)) 375 fib_del_ifaddr(ifa, ifa1); 376 } 377 378 /* 2. Unlink it */ 379 380 *ifap = ifa1->ifa_next; 381 inet_hash_remove(ifa1); 382 383 /* 3. Announce address deletion */ 384 385 /* Send message first, then call notifier. 386 At first sight, FIB update triggered by notifier 387 will refer to already deleted ifaddr, that could confuse 388 netlink listeners. It is not true: look, gated sees 389 that route deleted and if it still thinks that ifaddr 390 is valid, it will try to restore deleted routes... Grr. 391 So that, this order is correct. 392 */ 393 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid); 394 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); 395 396 if (promote) { 397 struct in_ifaddr *next_sec = promote->ifa_next; 398 399 if (prev_prom) { 400 prev_prom->ifa_next = promote->ifa_next; 401 promote->ifa_next = last_prim->ifa_next; 402 last_prim->ifa_next = promote; 403 } 404 405 promote->ifa_flags &= ~IFA_F_SECONDARY; 406 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid); 407 blocking_notifier_call_chain(&inetaddr_chain, 408 NETDEV_UP, promote); 409 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) { 410 if (ifa1->ifa_mask != ifa->ifa_mask || 411 !inet_ifa_match(ifa1->ifa_address, ifa)) 412 continue; 413 fib_add_ifaddr(ifa); 414 } 415 416 } 417 if (destroy) 418 inet_free_ifa(ifa1); 419 } 420 421 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 422 int destroy) 423 { 424 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); 425 } 426 427 static void check_lifetime(struct work_struct *work); 428 429 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime); 430 431 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, 432 u32 portid) 433 { 434 struct in_device *in_dev = ifa->ifa_dev; 435 struct in_ifaddr *ifa1, **ifap, **last_primary; 436 437 ASSERT_RTNL(); 438 439 if (!ifa->ifa_local) { 440 inet_free_ifa(ifa); 441 return 0; 442 } 443 444 ifa->ifa_flags &= ~IFA_F_SECONDARY; 445 last_primary = &in_dev->ifa_list; 446 447 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 448 ifap = &ifa1->ifa_next) { 449 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && 450 ifa->ifa_scope <= ifa1->ifa_scope) 451 last_primary = &ifa1->ifa_next; 452 if (ifa1->ifa_mask == ifa->ifa_mask && 453 inet_ifa_match(ifa1->ifa_address, ifa)) { 454 if (ifa1->ifa_local == ifa->ifa_local) { 455 inet_free_ifa(ifa); 456 return -EEXIST; 457 } 458 if (ifa1->ifa_scope != ifa->ifa_scope) { 459 inet_free_ifa(ifa); 460 return -EINVAL; 461 } 462 ifa->ifa_flags |= IFA_F_SECONDARY; 463 } 464 } 465 466 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { 467 prandom_seed((__force u32) ifa->ifa_local); 468 ifap = last_primary; 469 } 470 471 ifa->ifa_next = *ifap; 472 *ifap = ifa; 473 474 inet_hash_insert(dev_net(in_dev->dev), ifa); 475 476 cancel_delayed_work(&check_lifetime_work); 477 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); 478 479 /* Send message first, then call notifier. 480 Notifier will trigger FIB update, so that 481 listeners of netlink will know about new ifaddr */ 482 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid); 483 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 484 485 return 0; 486 } 487 488 static int inet_insert_ifa(struct in_ifaddr *ifa) 489 { 490 return __inet_insert_ifa(ifa, NULL, 0); 491 } 492 493 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) 494 { 495 struct in_device *in_dev = __in_dev_get_rtnl(dev); 496 497 ASSERT_RTNL(); 498 499 if (!in_dev) { 500 inet_free_ifa(ifa); 501 return -ENOBUFS; 502 } 503 ipv4_devconf_setall(in_dev); 504 neigh_parms_data_state_setall(in_dev->arp_parms); 505 if (ifa->ifa_dev != in_dev) { 506 WARN_ON(ifa->ifa_dev); 507 in_dev_hold(in_dev); 508 ifa->ifa_dev = in_dev; 509 } 510 if (ipv4_is_loopback(ifa->ifa_local)) 511 ifa->ifa_scope = RT_SCOPE_HOST; 512 return inet_insert_ifa(ifa); 513 } 514 515 /* Caller must hold RCU or RTNL : 516 * We dont take a reference on found in_device 517 */ 518 struct in_device *inetdev_by_index(struct net *net, int ifindex) 519 { 520 struct net_device *dev; 521 struct in_device *in_dev = NULL; 522 523 rcu_read_lock(); 524 dev = dev_get_by_index_rcu(net, ifindex); 525 if (dev) 526 in_dev = rcu_dereference_rtnl(dev->ip_ptr); 527 rcu_read_unlock(); 528 return in_dev; 529 } 530 EXPORT_SYMBOL(inetdev_by_index); 531 532 /* Called only from RTNL semaphored context. No locks. */ 533 534 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, 535 __be32 mask) 536 { 537 ASSERT_RTNL(); 538 539 for_primary_ifa(in_dev) { 540 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) 541 return ifa; 542 } endfor_ifa(in_dev); 543 return NULL; 544 } 545 546 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 547 { 548 struct net *net = sock_net(skb->sk); 549 struct nlattr *tb[IFA_MAX+1]; 550 struct in_device *in_dev; 551 struct ifaddrmsg *ifm; 552 struct in_ifaddr *ifa, **ifap; 553 int err = -EINVAL; 554 555 ASSERT_RTNL(); 556 557 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 558 if (err < 0) 559 goto errout; 560 561 ifm = nlmsg_data(nlh); 562 in_dev = inetdev_by_index(net, ifm->ifa_index); 563 if (in_dev == NULL) { 564 err = -ENODEV; 565 goto errout; 566 } 567 568 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 569 ifap = &ifa->ifa_next) { 570 if (tb[IFA_LOCAL] && 571 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) 572 continue; 573 574 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) 575 continue; 576 577 if (tb[IFA_ADDRESS] && 578 (ifm->ifa_prefixlen != ifa->ifa_prefixlen || 579 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) 580 continue; 581 582 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); 583 return 0; 584 } 585 586 err = -EADDRNOTAVAIL; 587 errout: 588 return err; 589 } 590 591 #define INFINITY_LIFE_TIME 0xFFFFFFFF 592 593 static void check_lifetime(struct work_struct *work) 594 { 595 unsigned long now, next, next_sec, next_sched; 596 struct in_ifaddr *ifa; 597 struct hlist_node *n; 598 int i; 599 600 now = jiffies; 601 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 602 603 for (i = 0; i < IN4_ADDR_HSIZE; i++) { 604 bool change_needed = false; 605 606 rcu_read_lock(); 607 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) { 608 unsigned long age; 609 610 if (ifa->ifa_flags & IFA_F_PERMANENT) 611 continue; 612 613 /* We try to batch several events at once. */ 614 age = (now - ifa->ifa_tstamp + 615 ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 616 617 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && 618 age >= ifa->ifa_valid_lft) { 619 change_needed = true; 620 } else if (ifa->ifa_preferred_lft == 621 INFINITY_LIFE_TIME) { 622 continue; 623 } else if (age >= ifa->ifa_preferred_lft) { 624 if (time_before(ifa->ifa_tstamp + 625 ifa->ifa_valid_lft * HZ, next)) 626 next = ifa->ifa_tstamp + 627 ifa->ifa_valid_lft * HZ; 628 629 if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) 630 change_needed = true; 631 } else if (time_before(ifa->ifa_tstamp + 632 ifa->ifa_preferred_lft * HZ, 633 next)) { 634 next = ifa->ifa_tstamp + 635 ifa->ifa_preferred_lft * HZ; 636 } 637 } 638 rcu_read_unlock(); 639 if (!change_needed) 640 continue; 641 rtnl_lock(); 642 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) { 643 unsigned long age; 644 645 if (ifa->ifa_flags & IFA_F_PERMANENT) 646 continue; 647 648 /* We try to batch several events at once. */ 649 age = (now - ifa->ifa_tstamp + 650 ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 651 652 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && 653 age >= ifa->ifa_valid_lft) { 654 struct in_ifaddr **ifap; 655 656 for (ifap = &ifa->ifa_dev->ifa_list; 657 *ifap != NULL; ifap = &(*ifap)->ifa_next) { 658 if (*ifap == ifa) { 659 inet_del_ifa(ifa->ifa_dev, 660 ifap, 1); 661 break; 662 } 663 } 664 } else if (ifa->ifa_preferred_lft != 665 INFINITY_LIFE_TIME && 666 age >= ifa->ifa_preferred_lft && 667 !(ifa->ifa_flags & IFA_F_DEPRECATED)) { 668 ifa->ifa_flags |= IFA_F_DEPRECATED; 669 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 670 } 671 } 672 rtnl_unlock(); 673 } 674 675 next_sec = round_jiffies_up(next); 676 next_sched = next; 677 678 /* If rounded timeout is accurate enough, accept it. */ 679 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 680 next_sched = next_sec; 681 682 now = jiffies; 683 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 684 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX)) 685 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX; 686 687 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 688 next_sched - now); 689 } 690 691 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, 692 __u32 prefered_lft) 693 { 694 unsigned long timeout; 695 696 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); 697 698 timeout = addrconf_timeout_fixup(valid_lft, HZ); 699 if (addrconf_finite_timeout(timeout)) 700 ifa->ifa_valid_lft = timeout; 701 else 702 ifa->ifa_flags |= IFA_F_PERMANENT; 703 704 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 705 if (addrconf_finite_timeout(timeout)) { 706 if (timeout == 0) 707 ifa->ifa_flags |= IFA_F_DEPRECATED; 708 ifa->ifa_preferred_lft = timeout; 709 } 710 ifa->ifa_tstamp = jiffies; 711 if (!ifa->ifa_cstamp) 712 ifa->ifa_cstamp = ifa->ifa_tstamp; 713 } 714 715 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, 716 __u32 *pvalid_lft, __u32 *pprefered_lft) 717 { 718 struct nlattr *tb[IFA_MAX+1]; 719 struct in_ifaddr *ifa; 720 struct ifaddrmsg *ifm; 721 struct net_device *dev; 722 struct in_device *in_dev; 723 int err; 724 725 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 726 if (err < 0) 727 goto errout; 728 729 ifm = nlmsg_data(nlh); 730 err = -EINVAL; 731 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) 732 goto errout; 733 734 dev = __dev_get_by_index(net, ifm->ifa_index); 735 err = -ENODEV; 736 if (dev == NULL) 737 goto errout; 738 739 in_dev = __in_dev_get_rtnl(dev); 740 err = -ENOBUFS; 741 if (in_dev == NULL) 742 goto errout; 743 744 ifa = inet_alloc_ifa(); 745 if (ifa == NULL) 746 /* 747 * A potential indev allocation can be left alive, it stays 748 * assigned to its device and is destroy with it. 749 */ 750 goto errout; 751 752 ipv4_devconf_setall(in_dev); 753 neigh_parms_data_state_setall(in_dev->arp_parms); 754 in_dev_hold(in_dev); 755 756 if (tb[IFA_ADDRESS] == NULL) 757 tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 758 759 INIT_HLIST_NODE(&ifa->hash); 760 ifa->ifa_prefixlen = ifm->ifa_prefixlen; 761 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 762 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : 763 ifm->ifa_flags; 764 ifa->ifa_scope = ifm->ifa_scope; 765 ifa->ifa_dev = in_dev; 766 767 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); 768 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); 769 770 if (tb[IFA_BROADCAST]) 771 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); 772 773 if (tb[IFA_LABEL]) 774 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 775 else 776 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 777 778 if (tb[IFA_CACHEINFO]) { 779 struct ifa_cacheinfo *ci; 780 781 ci = nla_data(tb[IFA_CACHEINFO]); 782 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { 783 err = -EINVAL; 784 goto errout_free; 785 } 786 *pvalid_lft = ci->ifa_valid; 787 *pprefered_lft = ci->ifa_prefered; 788 } 789 790 return ifa; 791 792 errout_free: 793 inet_free_ifa(ifa); 794 errout: 795 return ERR_PTR(err); 796 } 797 798 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) 799 { 800 struct in_device *in_dev = ifa->ifa_dev; 801 struct in_ifaddr *ifa1, **ifap; 802 803 if (!ifa->ifa_local) 804 return NULL; 805 806 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 807 ifap = &ifa1->ifa_next) { 808 if (ifa1->ifa_mask == ifa->ifa_mask && 809 inet_ifa_match(ifa1->ifa_address, ifa) && 810 ifa1->ifa_local == ifa->ifa_local) 811 return ifa1; 812 } 813 return NULL; 814 } 815 816 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 817 { 818 struct net *net = sock_net(skb->sk); 819 struct in_ifaddr *ifa; 820 struct in_ifaddr *ifa_existing; 821 __u32 valid_lft = INFINITY_LIFE_TIME; 822 __u32 prefered_lft = INFINITY_LIFE_TIME; 823 824 ASSERT_RTNL(); 825 826 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft); 827 if (IS_ERR(ifa)) 828 return PTR_ERR(ifa); 829 830 ifa_existing = find_matching_ifa(ifa); 831 if (!ifa_existing) { 832 /* It would be best to check for !NLM_F_CREATE here but 833 * userspace alreay relies on not having to provide this. 834 */ 835 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 836 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid); 837 } else { 838 inet_free_ifa(ifa); 839 840 if (nlh->nlmsg_flags & NLM_F_EXCL || 841 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 842 return -EEXIST; 843 ifa = ifa_existing; 844 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 845 cancel_delayed_work(&check_lifetime_work); 846 queue_delayed_work(system_power_efficient_wq, 847 &check_lifetime_work, 0); 848 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); 849 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 850 } 851 return 0; 852 } 853 854 /* 855 * Determine a default network mask, based on the IP address. 856 */ 857 858 static int inet_abc_len(__be32 addr) 859 { 860 int rc = -1; /* Something else, probably a multicast. */ 861 862 if (ipv4_is_zeronet(addr)) 863 rc = 0; 864 else { 865 __u32 haddr = ntohl(addr); 866 867 if (IN_CLASSA(haddr)) 868 rc = 8; 869 else if (IN_CLASSB(haddr)) 870 rc = 16; 871 else if (IN_CLASSC(haddr)) 872 rc = 24; 873 } 874 875 return rc; 876 } 877 878 879 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) 880 { 881 struct ifreq ifr; 882 struct sockaddr_in sin_orig; 883 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; 884 struct in_device *in_dev; 885 struct in_ifaddr **ifap = NULL; 886 struct in_ifaddr *ifa = NULL; 887 struct net_device *dev; 888 char *colon; 889 int ret = -EFAULT; 890 int tryaddrmatch = 0; 891 892 /* 893 * Fetch the caller's info block into kernel space 894 */ 895 896 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 897 goto out; 898 ifr.ifr_name[IFNAMSIZ - 1] = 0; 899 900 /* save original address for comparison */ 901 memcpy(&sin_orig, sin, sizeof(*sin)); 902 903 colon = strchr(ifr.ifr_name, ':'); 904 if (colon) 905 *colon = 0; 906 907 dev_load(net, ifr.ifr_name); 908 909 switch (cmd) { 910 case SIOCGIFADDR: /* Get interface address */ 911 case SIOCGIFBRDADDR: /* Get the broadcast address */ 912 case SIOCGIFDSTADDR: /* Get the destination address */ 913 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 914 /* Note that these ioctls will not sleep, 915 so that we do not impose a lock. 916 One day we will be forced to put shlock here (I mean SMP) 917 */ 918 tryaddrmatch = (sin_orig.sin_family == AF_INET); 919 memset(sin, 0, sizeof(*sin)); 920 sin->sin_family = AF_INET; 921 break; 922 923 case SIOCSIFFLAGS: 924 ret = -EPERM; 925 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 926 goto out; 927 break; 928 case SIOCSIFADDR: /* Set interface address (and family) */ 929 case SIOCSIFBRDADDR: /* Set the broadcast address */ 930 case SIOCSIFDSTADDR: /* Set the destination address */ 931 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 932 ret = -EPERM; 933 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 934 goto out; 935 ret = -EINVAL; 936 if (sin->sin_family != AF_INET) 937 goto out; 938 break; 939 default: 940 ret = -EINVAL; 941 goto out; 942 } 943 944 rtnl_lock(); 945 946 ret = -ENODEV; 947 dev = __dev_get_by_name(net, ifr.ifr_name); 948 if (!dev) 949 goto done; 950 951 if (colon) 952 *colon = ':'; 953 954 in_dev = __in_dev_get_rtnl(dev); 955 if (in_dev) { 956 if (tryaddrmatch) { 957 /* Matthias Andree */ 958 /* compare label and address (4.4BSD style) */ 959 /* note: we only do this for a limited set of ioctls 960 and only if the original address family was AF_INET. 961 This is checked above. */ 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 sin_orig.sin_addr.s_addr == 966 ifa->ifa_local) { 967 break; /* found */ 968 } 969 } 970 } 971 /* we didn't get a match, maybe the application is 972 4.3BSD-style and passed in junk so we fall back to 973 comparing just the label */ 974 if (!ifa) { 975 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 976 ifap = &ifa->ifa_next) 977 if (!strcmp(ifr.ifr_name, ifa->ifa_label)) 978 break; 979 } 980 } 981 982 ret = -EADDRNOTAVAIL; 983 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 984 goto done; 985 986 switch (cmd) { 987 case SIOCGIFADDR: /* Get interface address */ 988 sin->sin_addr.s_addr = ifa->ifa_local; 989 goto rarok; 990 991 case SIOCGIFBRDADDR: /* Get the broadcast address */ 992 sin->sin_addr.s_addr = ifa->ifa_broadcast; 993 goto rarok; 994 995 case SIOCGIFDSTADDR: /* Get the destination address */ 996 sin->sin_addr.s_addr = ifa->ifa_address; 997 goto rarok; 998 999 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 1000 sin->sin_addr.s_addr = ifa->ifa_mask; 1001 goto rarok; 1002 1003 case SIOCSIFFLAGS: 1004 if (colon) { 1005 ret = -EADDRNOTAVAIL; 1006 if (!ifa) 1007 break; 1008 ret = 0; 1009 if (!(ifr.ifr_flags & IFF_UP)) 1010 inet_del_ifa(in_dev, ifap, 1); 1011 break; 1012 } 1013 ret = dev_change_flags(dev, ifr.ifr_flags); 1014 break; 1015 1016 case SIOCSIFADDR: /* Set interface address (and family) */ 1017 ret = -EINVAL; 1018 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1019 break; 1020 1021 if (!ifa) { 1022 ret = -ENOBUFS; 1023 ifa = inet_alloc_ifa(); 1024 if (!ifa) 1025 break; 1026 INIT_HLIST_NODE(&ifa->hash); 1027 if (colon) 1028 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); 1029 else 1030 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1031 } else { 1032 ret = 0; 1033 if (ifa->ifa_local == sin->sin_addr.s_addr) 1034 break; 1035 inet_del_ifa(in_dev, ifap, 0); 1036 ifa->ifa_broadcast = 0; 1037 ifa->ifa_scope = 0; 1038 } 1039 1040 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 1041 1042 if (!(dev->flags & IFF_POINTOPOINT)) { 1043 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 1044 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 1045 if ((dev->flags & IFF_BROADCAST) && 1046 ifa->ifa_prefixlen < 31) 1047 ifa->ifa_broadcast = ifa->ifa_address | 1048 ~ifa->ifa_mask; 1049 } else { 1050 ifa->ifa_prefixlen = 32; 1051 ifa->ifa_mask = inet_make_mask(32); 1052 } 1053 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 1054 ret = inet_set_ifa(dev, ifa); 1055 break; 1056 1057 case SIOCSIFBRDADDR: /* Set the broadcast address */ 1058 ret = 0; 1059 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 1060 inet_del_ifa(in_dev, ifap, 0); 1061 ifa->ifa_broadcast = sin->sin_addr.s_addr; 1062 inet_insert_ifa(ifa); 1063 } 1064 break; 1065 1066 case SIOCSIFDSTADDR: /* Set the destination address */ 1067 ret = 0; 1068 if (ifa->ifa_address == sin->sin_addr.s_addr) 1069 break; 1070 ret = -EINVAL; 1071 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1072 break; 1073 ret = 0; 1074 inet_del_ifa(in_dev, ifap, 0); 1075 ifa->ifa_address = sin->sin_addr.s_addr; 1076 inet_insert_ifa(ifa); 1077 break; 1078 1079 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 1080 1081 /* 1082 * The mask we set must be legal. 1083 */ 1084 ret = -EINVAL; 1085 if (bad_mask(sin->sin_addr.s_addr, 0)) 1086 break; 1087 ret = 0; 1088 if (ifa->ifa_mask != sin->sin_addr.s_addr) { 1089 __be32 old_mask = ifa->ifa_mask; 1090 inet_del_ifa(in_dev, ifap, 0); 1091 ifa->ifa_mask = sin->sin_addr.s_addr; 1092 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 1093 1094 /* See if current broadcast address matches 1095 * with current netmask, then recalculate 1096 * the broadcast address. Otherwise it's a 1097 * funny address, so don't touch it since 1098 * the user seems to know what (s)he's doing... 1099 */ 1100 if ((dev->flags & IFF_BROADCAST) && 1101 (ifa->ifa_prefixlen < 31) && 1102 (ifa->ifa_broadcast == 1103 (ifa->ifa_local|~old_mask))) { 1104 ifa->ifa_broadcast = (ifa->ifa_local | 1105 ~sin->sin_addr.s_addr); 1106 } 1107 inet_insert_ifa(ifa); 1108 } 1109 break; 1110 } 1111 done: 1112 rtnl_unlock(); 1113 out: 1114 return ret; 1115 rarok: 1116 rtnl_unlock(); 1117 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; 1118 goto out; 1119 } 1120 1121 static int inet_gifconf(struct net_device *dev, char __user *buf, int len) 1122 { 1123 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1124 struct in_ifaddr *ifa; 1125 struct ifreq ifr; 1126 int done = 0; 1127 1128 if (!in_dev) 1129 goto out; 1130 1131 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1132 if (!buf) { 1133 done += sizeof(ifr); 1134 continue; 1135 } 1136 if (len < (int) sizeof(ifr)) 1137 break; 1138 memset(&ifr, 0, sizeof(struct ifreq)); 1139 strcpy(ifr.ifr_name, ifa->ifa_label); 1140 1141 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 1142 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 1143 ifa->ifa_local; 1144 1145 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { 1146 done = -EFAULT; 1147 break; 1148 } 1149 buf += sizeof(struct ifreq); 1150 len -= sizeof(struct ifreq); 1151 done += sizeof(struct ifreq); 1152 } 1153 out: 1154 return done; 1155 } 1156 1157 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 1158 { 1159 __be32 addr = 0; 1160 struct in_device *in_dev; 1161 struct net *net = dev_net(dev); 1162 1163 rcu_read_lock(); 1164 in_dev = __in_dev_get_rcu(dev); 1165 if (!in_dev) 1166 goto no_in_dev; 1167 1168 for_primary_ifa(in_dev) { 1169 if (ifa->ifa_scope > scope) 1170 continue; 1171 if (!dst || inet_ifa_match(dst, ifa)) { 1172 addr = ifa->ifa_local; 1173 break; 1174 } 1175 if (!addr) 1176 addr = ifa->ifa_local; 1177 } endfor_ifa(in_dev); 1178 1179 if (addr) 1180 goto out_unlock; 1181 no_in_dev: 1182 1183 /* Not loopback addresses on loopback should be preferred 1184 in this case. It is importnat that lo is the first interface 1185 in dev_base list. 1186 */ 1187 for_each_netdev_rcu(net, dev) { 1188 in_dev = __in_dev_get_rcu(dev); 1189 if (!in_dev) 1190 continue; 1191 1192 for_primary_ifa(in_dev) { 1193 if (ifa->ifa_scope != RT_SCOPE_LINK && 1194 ifa->ifa_scope <= scope) { 1195 addr = ifa->ifa_local; 1196 goto out_unlock; 1197 } 1198 } endfor_ifa(in_dev); 1199 } 1200 out_unlock: 1201 rcu_read_unlock(); 1202 return addr; 1203 } 1204 EXPORT_SYMBOL(inet_select_addr); 1205 1206 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 1207 __be32 local, int scope) 1208 { 1209 int same = 0; 1210 __be32 addr = 0; 1211 1212 for_ifa(in_dev) { 1213 if (!addr && 1214 (local == ifa->ifa_local || !local) && 1215 ifa->ifa_scope <= scope) { 1216 addr = ifa->ifa_local; 1217 if (same) 1218 break; 1219 } 1220 if (!same) { 1221 same = (!local || inet_ifa_match(local, ifa)) && 1222 (!dst || inet_ifa_match(dst, ifa)); 1223 if (same && addr) { 1224 if (local || !dst) 1225 break; 1226 /* Is the selected addr into dst subnet? */ 1227 if (inet_ifa_match(addr, ifa)) 1228 break; 1229 /* No, then can we use new local src? */ 1230 if (ifa->ifa_scope <= scope) { 1231 addr = ifa->ifa_local; 1232 break; 1233 } 1234 /* search for large dst subnet for addr */ 1235 same = 0; 1236 } 1237 } 1238 } endfor_ifa(in_dev); 1239 1240 return same ? addr : 0; 1241 } 1242 1243 /* 1244 * Confirm that local IP address exists using wildcards: 1245 * - net: netns to check, cannot be NULL 1246 * - in_dev: only on this interface, NULL=any interface 1247 * - dst: only in the same subnet as dst, 0=any dst 1248 * - local: address, 0=autoselect the local address 1249 * - scope: maximum allowed scope value for the local address 1250 */ 1251 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, 1252 __be32 dst, __be32 local, int scope) 1253 { 1254 __be32 addr = 0; 1255 struct net_device *dev; 1256 1257 if (in_dev != NULL) 1258 return confirm_addr_indev(in_dev, dst, local, scope); 1259 1260 rcu_read_lock(); 1261 for_each_netdev_rcu(net, dev) { 1262 in_dev = __in_dev_get_rcu(dev); 1263 if (in_dev) { 1264 addr = confirm_addr_indev(in_dev, dst, local, scope); 1265 if (addr) 1266 break; 1267 } 1268 } 1269 rcu_read_unlock(); 1270 1271 return addr; 1272 } 1273 EXPORT_SYMBOL(inet_confirm_addr); 1274 1275 /* 1276 * Device notifier 1277 */ 1278 1279 int register_inetaddr_notifier(struct notifier_block *nb) 1280 { 1281 return blocking_notifier_chain_register(&inetaddr_chain, nb); 1282 } 1283 EXPORT_SYMBOL(register_inetaddr_notifier); 1284 1285 int unregister_inetaddr_notifier(struct notifier_block *nb) 1286 { 1287 return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 1288 } 1289 EXPORT_SYMBOL(unregister_inetaddr_notifier); 1290 1291 /* Rename ifa_labels for a device name change. Make some effort to preserve 1292 * existing alias numbering and to create unique labels if possible. 1293 */ 1294 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 1295 { 1296 struct in_ifaddr *ifa; 1297 int named = 0; 1298 1299 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1300 char old[IFNAMSIZ], *dot; 1301 1302 memcpy(old, ifa->ifa_label, IFNAMSIZ); 1303 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1304 if (named++ == 0) 1305 goto skip; 1306 dot = strchr(old, ':'); 1307 if (dot == NULL) { 1308 sprintf(old, ":%d", named); 1309 dot = old; 1310 } 1311 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) 1312 strcat(ifa->ifa_label, dot); 1313 else 1314 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 1315 skip: 1316 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 1317 } 1318 } 1319 1320 static bool inetdev_valid_mtu(unsigned int mtu) 1321 { 1322 return mtu >= 68; 1323 } 1324 1325 static void inetdev_send_gratuitous_arp(struct net_device *dev, 1326 struct in_device *in_dev) 1327 1328 { 1329 struct in_ifaddr *ifa; 1330 1331 for (ifa = in_dev->ifa_list; ifa; 1332 ifa = ifa->ifa_next) { 1333 arp_send(ARPOP_REQUEST, ETH_P_ARP, 1334 ifa->ifa_local, dev, 1335 ifa->ifa_local, NULL, 1336 dev->dev_addr, NULL); 1337 } 1338 } 1339 1340 /* Called only under RTNL semaphore */ 1341 1342 static int inetdev_event(struct notifier_block *this, unsigned long event, 1343 void *ptr) 1344 { 1345 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1346 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1347 1348 ASSERT_RTNL(); 1349 1350 if (!in_dev) { 1351 if (event == NETDEV_REGISTER) { 1352 in_dev = inetdev_init(dev); 1353 if (!in_dev) 1354 return notifier_from_errno(-ENOMEM); 1355 if (dev->flags & IFF_LOOPBACK) { 1356 IN_DEV_CONF_SET(in_dev, NOXFRM, 1); 1357 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); 1358 } 1359 } else if (event == NETDEV_CHANGEMTU) { 1360 /* Re-enabling IP */ 1361 if (inetdev_valid_mtu(dev->mtu)) 1362 in_dev = inetdev_init(dev); 1363 } 1364 goto out; 1365 } 1366 1367 switch (event) { 1368 case NETDEV_REGISTER: 1369 pr_debug("%s: bug\n", __func__); 1370 RCU_INIT_POINTER(dev->ip_ptr, NULL); 1371 break; 1372 case NETDEV_UP: 1373 if (!inetdev_valid_mtu(dev->mtu)) 1374 break; 1375 if (dev->flags & IFF_LOOPBACK) { 1376 struct in_ifaddr *ifa = inet_alloc_ifa(); 1377 1378 if (ifa) { 1379 INIT_HLIST_NODE(&ifa->hash); 1380 ifa->ifa_local = 1381 ifa->ifa_address = htonl(INADDR_LOOPBACK); 1382 ifa->ifa_prefixlen = 8; 1383 ifa->ifa_mask = inet_make_mask(8); 1384 in_dev_hold(in_dev); 1385 ifa->ifa_dev = in_dev; 1386 ifa->ifa_scope = RT_SCOPE_HOST; 1387 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1388 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, 1389 INFINITY_LIFE_TIME); 1390 ipv4_devconf_setall(in_dev); 1391 neigh_parms_data_state_setall(in_dev->arp_parms); 1392 inet_insert_ifa(ifa); 1393 } 1394 } 1395 ip_mc_up(in_dev); 1396 /* fall through */ 1397 case NETDEV_CHANGEADDR: 1398 if (!IN_DEV_ARP_NOTIFY(in_dev)) 1399 break; 1400 /* fall through */ 1401 case NETDEV_NOTIFY_PEERS: 1402 /* Send gratuitous ARP to notify of link change */ 1403 inetdev_send_gratuitous_arp(dev, in_dev); 1404 break; 1405 case NETDEV_DOWN: 1406 ip_mc_down(in_dev); 1407 break; 1408 case NETDEV_PRE_TYPE_CHANGE: 1409 ip_mc_unmap(in_dev); 1410 break; 1411 case NETDEV_POST_TYPE_CHANGE: 1412 ip_mc_remap(in_dev); 1413 break; 1414 case NETDEV_CHANGEMTU: 1415 if (inetdev_valid_mtu(dev->mtu)) 1416 break; 1417 /* disable IP when MTU is not enough */ 1418 case NETDEV_UNREGISTER: 1419 inetdev_destroy(in_dev); 1420 break; 1421 case NETDEV_CHANGENAME: 1422 /* Do not notify about label change, this event is 1423 * not interesting to applications using netlink. 1424 */ 1425 inetdev_changename(dev, in_dev); 1426 1427 devinet_sysctl_unregister(in_dev); 1428 devinet_sysctl_register(in_dev); 1429 break; 1430 } 1431 out: 1432 return NOTIFY_DONE; 1433 } 1434 1435 static struct notifier_block ip_netdev_notifier = { 1436 .notifier_call = inetdev_event, 1437 }; 1438 1439 static size_t inet_nlmsg_size(void) 1440 { 1441 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1442 + nla_total_size(4) /* IFA_ADDRESS */ 1443 + nla_total_size(4) /* IFA_LOCAL */ 1444 + nla_total_size(4) /* IFA_BROADCAST */ 1445 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ 1446 + nla_total_size(4); /* IFA_FLAGS */ 1447 } 1448 1449 static inline u32 cstamp_delta(unsigned long cstamp) 1450 { 1451 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 1452 } 1453 1454 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 1455 unsigned long tstamp, u32 preferred, u32 valid) 1456 { 1457 struct ifa_cacheinfo ci; 1458 1459 ci.cstamp = cstamp_delta(cstamp); 1460 ci.tstamp = cstamp_delta(tstamp); 1461 ci.ifa_prefered = preferred; 1462 ci.ifa_valid = valid; 1463 1464 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 1465 } 1466 1467 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1468 u32 portid, u32 seq, int event, unsigned int flags) 1469 { 1470 struct ifaddrmsg *ifm; 1471 struct nlmsghdr *nlh; 1472 u32 preferred, valid; 1473 1474 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); 1475 if (nlh == NULL) 1476 return -EMSGSIZE; 1477 1478 ifm = nlmsg_data(nlh); 1479 ifm->ifa_family = AF_INET; 1480 ifm->ifa_prefixlen = ifa->ifa_prefixlen; 1481 ifm->ifa_flags = ifa->ifa_flags; 1482 ifm->ifa_scope = ifa->ifa_scope; 1483 ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 1484 1485 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { 1486 preferred = ifa->ifa_preferred_lft; 1487 valid = ifa->ifa_valid_lft; 1488 if (preferred != INFINITY_LIFE_TIME) { 1489 long tval = (jiffies - ifa->ifa_tstamp) / HZ; 1490 1491 if (preferred > tval) 1492 preferred -= tval; 1493 else 1494 preferred = 0; 1495 if (valid != INFINITY_LIFE_TIME) { 1496 if (valid > tval) 1497 valid -= tval; 1498 else 1499 valid = 0; 1500 } 1501 } 1502 } else { 1503 preferred = INFINITY_LIFE_TIME; 1504 valid = INFINITY_LIFE_TIME; 1505 } 1506 if ((ifa->ifa_address && 1507 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) || 1508 (ifa->ifa_local && 1509 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) || 1510 (ifa->ifa_broadcast && 1511 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || 1512 (ifa->ifa_label[0] && 1513 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || 1514 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) || 1515 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, 1516 preferred, valid)) 1517 goto nla_put_failure; 1518 1519 return nlmsg_end(skb, nlh); 1520 1521 nla_put_failure: 1522 nlmsg_cancel(skb, nlh); 1523 return -EMSGSIZE; 1524 } 1525 1526 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1527 { 1528 struct net *net = sock_net(skb->sk); 1529 int h, s_h; 1530 int idx, s_idx; 1531 int ip_idx, s_ip_idx; 1532 struct net_device *dev; 1533 struct in_device *in_dev; 1534 struct in_ifaddr *ifa; 1535 struct hlist_head *head; 1536 1537 s_h = cb->args[0]; 1538 s_idx = idx = cb->args[1]; 1539 s_ip_idx = ip_idx = cb->args[2]; 1540 1541 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1542 idx = 0; 1543 head = &net->dev_index_head[h]; 1544 rcu_read_lock(); 1545 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1546 net->dev_base_seq; 1547 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1548 if (idx < s_idx) 1549 goto cont; 1550 if (h > s_h || idx > s_idx) 1551 s_ip_idx = 0; 1552 in_dev = __in_dev_get_rcu(dev); 1553 if (!in_dev) 1554 goto cont; 1555 1556 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 1557 ifa = ifa->ifa_next, ip_idx++) { 1558 if (ip_idx < s_ip_idx) 1559 continue; 1560 if (inet_fill_ifaddr(skb, ifa, 1561 NETLINK_CB(cb->skb).portid, 1562 cb->nlh->nlmsg_seq, 1563 RTM_NEWADDR, NLM_F_MULTI) <= 0) { 1564 rcu_read_unlock(); 1565 goto done; 1566 } 1567 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1568 } 1569 cont: 1570 idx++; 1571 } 1572 rcu_read_unlock(); 1573 } 1574 1575 done: 1576 cb->args[0] = h; 1577 cb->args[1] = idx; 1578 cb->args[2] = ip_idx; 1579 1580 return skb->len; 1581 } 1582 1583 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, 1584 u32 portid) 1585 { 1586 struct sk_buff *skb; 1587 u32 seq = nlh ? nlh->nlmsg_seq : 0; 1588 int err = -ENOBUFS; 1589 struct net *net; 1590 1591 net = dev_net(ifa->ifa_dev->dev); 1592 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1593 if (skb == NULL) 1594 goto errout; 1595 1596 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0); 1597 if (err < 0) { 1598 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1599 WARN_ON(err == -EMSGSIZE); 1600 kfree_skb(skb); 1601 goto errout; 1602 } 1603 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1604 return; 1605 errout: 1606 if (err < 0) 1607 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); 1608 } 1609 1610 static size_t inet_get_link_af_size(const struct net_device *dev) 1611 { 1612 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1613 1614 if (!in_dev) 1615 return 0; 1616 1617 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ 1618 } 1619 1620 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 1621 { 1622 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1623 struct nlattr *nla; 1624 int i; 1625 1626 if (!in_dev) 1627 return -ENODATA; 1628 1629 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); 1630 if (nla == NULL) 1631 return -EMSGSIZE; 1632 1633 for (i = 0; i < IPV4_DEVCONF_MAX; i++) 1634 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; 1635 1636 return 0; 1637 } 1638 1639 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { 1640 [IFLA_INET_CONF] = { .type = NLA_NESTED }, 1641 }; 1642 1643 static int inet_validate_link_af(const struct net_device *dev, 1644 const struct nlattr *nla) 1645 { 1646 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1647 int err, rem; 1648 1649 if (dev && !__in_dev_get_rtnl(dev)) 1650 return -EAFNOSUPPORT; 1651 1652 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); 1653 if (err < 0) 1654 return err; 1655 1656 if (tb[IFLA_INET_CONF]) { 1657 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { 1658 int cfgid = nla_type(a); 1659 1660 if (nla_len(a) < 4) 1661 return -EINVAL; 1662 1663 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) 1664 return -EINVAL; 1665 } 1666 } 1667 1668 return 0; 1669 } 1670 1671 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) 1672 { 1673 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1674 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1675 int rem; 1676 1677 if (!in_dev) 1678 return -EAFNOSUPPORT; 1679 1680 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) 1681 BUG(); 1682 1683 if (tb[IFLA_INET_CONF]) { 1684 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) 1685 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); 1686 } 1687 1688 return 0; 1689 } 1690 1691 static int inet_netconf_msgsize_devconf(int type) 1692 { 1693 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1694 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1695 1696 /* type -1 is used for ALL */ 1697 if (type == -1 || type == NETCONFA_FORWARDING) 1698 size += nla_total_size(4); 1699 if (type == -1 || type == NETCONFA_RP_FILTER) 1700 size += nla_total_size(4); 1701 if (type == -1 || type == NETCONFA_MC_FORWARDING) 1702 size += nla_total_size(4); 1703 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 1704 size += nla_total_size(4); 1705 1706 return size; 1707 } 1708 1709 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 1710 struct ipv4_devconf *devconf, u32 portid, 1711 u32 seq, int event, unsigned int flags, 1712 int type) 1713 { 1714 struct nlmsghdr *nlh; 1715 struct netconfmsg *ncm; 1716 1717 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1718 flags); 1719 if (nlh == NULL) 1720 return -EMSGSIZE; 1721 1722 ncm = nlmsg_data(nlh); 1723 ncm->ncm_family = AF_INET; 1724 1725 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 1726 goto nla_put_failure; 1727 1728 /* type -1 is used for ALL */ 1729 if ((type == -1 || type == NETCONFA_FORWARDING) && 1730 nla_put_s32(skb, NETCONFA_FORWARDING, 1731 IPV4_DEVCONF(*devconf, FORWARDING)) < 0) 1732 goto nla_put_failure; 1733 if ((type == -1 || type == NETCONFA_RP_FILTER) && 1734 nla_put_s32(skb, NETCONFA_RP_FILTER, 1735 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) 1736 goto nla_put_failure; 1737 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 1738 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 1739 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) 1740 goto nla_put_failure; 1741 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 1742 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 1743 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0) 1744 goto nla_put_failure; 1745 1746 return nlmsg_end(skb, nlh); 1747 1748 nla_put_failure: 1749 nlmsg_cancel(skb, nlh); 1750 return -EMSGSIZE; 1751 } 1752 1753 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex, 1754 struct ipv4_devconf *devconf) 1755 { 1756 struct sk_buff *skb; 1757 int err = -ENOBUFS; 1758 1759 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC); 1760 if (skb == NULL) 1761 goto errout; 1762 1763 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 1764 RTM_NEWNETCONF, 0, type); 1765 if (err < 0) { 1766 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1767 WARN_ON(err == -EMSGSIZE); 1768 kfree_skb(skb); 1769 goto errout; 1770 } 1771 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC); 1772 return; 1773 errout: 1774 if (err < 0) 1775 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); 1776 } 1777 1778 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { 1779 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1780 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 1781 [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, 1782 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 1783 }; 1784 1785 static int inet_netconf_get_devconf(struct sk_buff *in_skb, 1786 struct nlmsghdr *nlh) 1787 { 1788 struct net *net = sock_net(in_skb->sk); 1789 struct nlattr *tb[NETCONFA_MAX+1]; 1790 struct netconfmsg *ncm; 1791 struct sk_buff *skb; 1792 struct ipv4_devconf *devconf; 1793 struct in_device *in_dev; 1794 struct net_device *dev; 1795 int ifindex; 1796 int err; 1797 1798 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 1799 devconf_ipv4_policy); 1800 if (err < 0) 1801 goto errout; 1802 1803 err = EINVAL; 1804 if (!tb[NETCONFA_IFINDEX]) 1805 goto errout; 1806 1807 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1808 switch (ifindex) { 1809 case NETCONFA_IFINDEX_ALL: 1810 devconf = net->ipv4.devconf_all; 1811 break; 1812 case NETCONFA_IFINDEX_DEFAULT: 1813 devconf = net->ipv4.devconf_dflt; 1814 break; 1815 default: 1816 dev = __dev_get_by_index(net, ifindex); 1817 if (dev == NULL) 1818 goto errout; 1819 in_dev = __in_dev_get_rtnl(dev); 1820 if (in_dev == NULL) 1821 goto errout; 1822 devconf = &in_dev->cnf; 1823 break; 1824 } 1825 1826 err = -ENOBUFS; 1827 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC); 1828 if (skb == NULL) 1829 goto errout; 1830 1831 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 1832 NETLINK_CB(in_skb).portid, 1833 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1834 -1); 1835 if (err < 0) { 1836 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1837 WARN_ON(err == -EMSGSIZE); 1838 kfree_skb(skb); 1839 goto errout; 1840 } 1841 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1842 errout: 1843 return err; 1844 } 1845 1846 static int inet_netconf_dump_devconf(struct sk_buff *skb, 1847 struct netlink_callback *cb) 1848 { 1849 struct net *net = sock_net(skb->sk); 1850 int h, s_h; 1851 int idx, s_idx; 1852 struct net_device *dev; 1853 struct in_device *in_dev; 1854 struct hlist_head *head; 1855 1856 s_h = cb->args[0]; 1857 s_idx = idx = cb->args[1]; 1858 1859 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1860 idx = 0; 1861 head = &net->dev_index_head[h]; 1862 rcu_read_lock(); 1863 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1864 net->dev_base_seq; 1865 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1866 if (idx < s_idx) 1867 goto cont; 1868 in_dev = __in_dev_get_rcu(dev); 1869 if (!in_dev) 1870 goto cont; 1871 1872 if (inet_netconf_fill_devconf(skb, dev->ifindex, 1873 &in_dev->cnf, 1874 NETLINK_CB(cb->skb).portid, 1875 cb->nlh->nlmsg_seq, 1876 RTM_NEWNETCONF, 1877 NLM_F_MULTI, 1878 -1) <= 0) { 1879 rcu_read_unlock(); 1880 goto done; 1881 } 1882 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1883 cont: 1884 idx++; 1885 } 1886 rcu_read_unlock(); 1887 } 1888 if (h == NETDEV_HASHENTRIES) { 1889 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 1890 net->ipv4.devconf_all, 1891 NETLINK_CB(cb->skb).portid, 1892 cb->nlh->nlmsg_seq, 1893 RTM_NEWNETCONF, NLM_F_MULTI, 1894 -1) <= 0) 1895 goto done; 1896 else 1897 h++; 1898 } 1899 if (h == NETDEV_HASHENTRIES + 1) { 1900 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 1901 net->ipv4.devconf_dflt, 1902 NETLINK_CB(cb->skb).portid, 1903 cb->nlh->nlmsg_seq, 1904 RTM_NEWNETCONF, NLM_F_MULTI, 1905 -1) <= 0) 1906 goto done; 1907 else 1908 h++; 1909 } 1910 done: 1911 cb->args[0] = h; 1912 cb->args[1] = idx; 1913 1914 return skb->len; 1915 } 1916 1917 #ifdef CONFIG_SYSCTL 1918 1919 static void devinet_copy_dflt_conf(struct net *net, int i) 1920 { 1921 struct net_device *dev; 1922 1923 rcu_read_lock(); 1924 for_each_netdev_rcu(net, dev) { 1925 struct in_device *in_dev; 1926 1927 in_dev = __in_dev_get_rcu(dev); 1928 if (in_dev && !test_bit(i, in_dev->cnf.state)) 1929 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 1930 } 1931 rcu_read_unlock(); 1932 } 1933 1934 /* called with RTNL locked */ 1935 static void inet_forward_change(struct net *net) 1936 { 1937 struct net_device *dev; 1938 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 1939 1940 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 1941 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 1942 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1943 NETCONFA_IFINDEX_ALL, 1944 net->ipv4.devconf_all); 1945 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1946 NETCONFA_IFINDEX_DEFAULT, 1947 net->ipv4.devconf_dflt); 1948 1949 for_each_netdev(net, dev) { 1950 struct in_device *in_dev; 1951 if (on) 1952 dev_disable_lro(dev); 1953 rcu_read_lock(); 1954 in_dev = __in_dev_get_rcu(dev); 1955 if (in_dev) { 1956 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 1957 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1958 dev->ifindex, &in_dev->cnf); 1959 } 1960 rcu_read_unlock(); 1961 } 1962 } 1963 1964 static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf) 1965 { 1966 if (cnf == net->ipv4.devconf_dflt) 1967 return NETCONFA_IFINDEX_DEFAULT; 1968 else if (cnf == net->ipv4.devconf_all) 1969 return NETCONFA_IFINDEX_ALL; 1970 else { 1971 struct in_device *idev 1972 = container_of(cnf, struct in_device, cnf); 1973 return idev->dev->ifindex; 1974 } 1975 } 1976 1977 static int devinet_conf_proc(struct ctl_table *ctl, int write, 1978 void __user *buffer, 1979 size_t *lenp, loff_t *ppos) 1980 { 1981 int old_value = *(int *)ctl->data; 1982 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1983 int new_value = *(int *)ctl->data; 1984 1985 if (write) { 1986 struct ipv4_devconf *cnf = ctl->extra1; 1987 struct net *net = ctl->extra2; 1988 int i = (int *)ctl->data - cnf->data; 1989 int ifindex; 1990 1991 set_bit(i, cnf->state); 1992 1993 if (cnf == net->ipv4.devconf_dflt) 1994 devinet_copy_dflt_conf(net, i); 1995 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || 1996 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) 1997 if ((new_value == 0) && (old_value != 0)) 1998 rt_cache_flush(net); 1999 2000 if (i == IPV4_DEVCONF_RP_FILTER - 1 && 2001 new_value != old_value) { 2002 ifindex = devinet_conf_ifindex(net, cnf); 2003 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER, 2004 ifindex, cnf); 2005 } 2006 if (i == IPV4_DEVCONF_PROXY_ARP - 1 && 2007 new_value != old_value) { 2008 ifindex = devinet_conf_ifindex(net, cnf); 2009 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 2010 ifindex, cnf); 2011 } 2012 } 2013 2014 return ret; 2015 } 2016 2017 static int devinet_sysctl_forward(struct ctl_table *ctl, int write, 2018 void __user *buffer, 2019 size_t *lenp, loff_t *ppos) 2020 { 2021 int *valp = ctl->data; 2022 int val = *valp; 2023 loff_t pos = *ppos; 2024 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2025 2026 if (write && *valp != val) { 2027 struct net *net = ctl->extra2; 2028 2029 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { 2030 if (!rtnl_trylock()) { 2031 /* Restore the original values before restarting */ 2032 *valp = val; 2033 *ppos = pos; 2034 return restart_syscall(); 2035 } 2036 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { 2037 inet_forward_change(net); 2038 } else { 2039 struct ipv4_devconf *cnf = ctl->extra1; 2040 struct in_device *idev = 2041 container_of(cnf, struct in_device, cnf); 2042 if (*valp) 2043 dev_disable_lro(idev->dev); 2044 inet_netconf_notify_devconf(net, 2045 NETCONFA_FORWARDING, 2046 idev->dev->ifindex, 2047 cnf); 2048 } 2049 rtnl_unlock(); 2050 rt_cache_flush(net); 2051 } else 2052 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 2053 NETCONFA_IFINDEX_DEFAULT, 2054 net->ipv4.devconf_dflt); 2055 } 2056 2057 return ret; 2058 } 2059 2060 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write, 2061 void __user *buffer, 2062 size_t *lenp, loff_t *ppos) 2063 { 2064 int *valp = ctl->data; 2065 int val = *valp; 2066 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2067 struct net *net = ctl->extra2; 2068 2069 if (write && *valp != val) 2070 rt_cache_flush(net); 2071 2072 return ret; 2073 } 2074 2075 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ 2076 { \ 2077 .procname = name, \ 2078 .data = ipv4_devconf.data + \ 2079 IPV4_DEVCONF_ ## attr - 1, \ 2080 .maxlen = sizeof(int), \ 2081 .mode = mval, \ 2082 .proc_handler = proc, \ 2083 .extra1 = &ipv4_devconf, \ 2084 } 2085 2086 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 2087 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) 2088 2089 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 2090 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) 2091 2092 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ 2093 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) 2094 2095 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 2096 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) 2097 2098 static struct devinet_sysctl_table { 2099 struct ctl_table_header *sysctl_header; 2100 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; 2101 } devinet_sysctl = { 2102 .devinet_vars = { 2103 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 2104 devinet_sysctl_forward), 2105 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 2106 2107 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 2108 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 2109 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 2110 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 2111 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 2112 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 2113 "accept_source_route"), 2114 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), 2115 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), 2116 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 2117 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 2118 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 2119 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 2120 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 2121 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 2122 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 2123 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 2124 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 2125 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), 2126 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), 2127 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION, 2128 "force_igmp_version"), 2129 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL, 2130 "igmpv2_unsolicited_report_interval"), 2131 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL, 2132 "igmpv3_unsolicited_report_interval"), 2133 2134 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 2135 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 2136 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 2137 "promote_secondaries"), 2138 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, 2139 "route_localnet"), 2140 }, 2141 }; 2142 2143 static int __devinet_sysctl_register(struct net *net, char *dev_name, 2144 struct ipv4_devconf *p) 2145 { 2146 int i; 2147 struct devinet_sysctl_table *t; 2148 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; 2149 2150 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 2151 if (!t) 2152 goto out; 2153 2154 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 2155 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 2156 t->devinet_vars[i].extra1 = p; 2157 t->devinet_vars[i].extra2 = net; 2158 } 2159 2160 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); 2161 2162 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); 2163 if (!t->sysctl_header) 2164 goto free; 2165 2166 p->sysctl = t; 2167 return 0; 2168 2169 free: 2170 kfree(t); 2171 out: 2172 return -ENOBUFS; 2173 } 2174 2175 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) 2176 { 2177 struct devinet_sysctl_table *t = cnf->sysctl; 2178 2179 if (t == NULL) 2180 return; 2181 2182 cnf->sysctl = NULL; 2183 unregister_net_sysctl_table(t->sysctl_header); 2184 kfree(t); 2185 } 2186 2187 static void devinet_sysctl_register(struct in_device *idev) 2188 { 2189 neigh_sysctl_register(idev->dev, idev->arp_parms, NULL); 2190 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, 2191 &idev->cnf); 2192 } 2193 2194 static void devinet_sysctl_unregister(struct in_device *idev) 2195 { 2196 __devinet_sysctl_unregister(&idev->cnf); 2197 neigh_sysctl_unregister(idev->arp_parms); 2198 } 2199 2200 static struct ctl_table ctl_forward_entry[] = { 2201 { 2202 .procname = "ip_forward", 2203 .data = &ipv4_devconf.data[ 2204 IPV4_DEVCONF_FORWARDING - 1], 2205 .maxlen = sizeof(int), 2206 .mode = 0644, 2207 .proc_handler = devinet_sysctl_forward, 2208 .extra1 = &ipv4_devconf, 2209 .extra2 = &init_net, 2210 }, 2211 { }, 2212 }; 2213 #endif 2214 2215 static __net_init int devinet_init_net(struct net *net) 2216 { 2217 int err; 2218 struct ipv4_devconf *all, *dflt; 2219 #ifdef CONFIG_SYSCTL 2220 struct ctl_table *tbl = ctl_forward_entry; 2221 struct ctl_table_header *forw_hdr; 2222 #endif 2223 2224 err = -ENOMEM; 2225 all = &ipv4_devconf; 2226 dflt = &ipv4_devconf_dflt; 2227 2228 if (!net_eq(net, &init_net)) { 2229 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); 2230 if (all == NULL) 2231 goto err_alloc_all; 2232 2233 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 2234 if (dflt == NULL) 2235 goto err_alloc_dflt; 2236 2237 #ifdef CONFIG_SYSCTL 2238 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); 2239 if (tbl == NULL) 2240 goto err_alloc_ctl; 2241 2242 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; 2243 tbl[0].extra1 = all; 2244 tbl[0].extra2 = net; 2245 #endif 2246 } 2247 2248 #ifdef CONFIG_SYSCTL 2249 err = __devinet_sysctl_register(net, "all", all); 2250 if (err < 0) 2251 goto err_reg_all; 2252 2253 err = __devinet_sysctl_register(net, "default", dflt); 2254 if (err < 0) 2255 goto err_reg_dflt; 2256 2257 err = -ENOMEM; 2258 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); 2259 if (forw_hdr == NULL) 2260 goto err_reg_ctl; 2261 net->ipv4.forw_hdr = forw_hdr; 2262 #endif 2263 2264 net->ipv4.devconf_all = all; 2265 net->ipv4.devconf_dflt = dflt; 2266 return 0; 2267 2268 #ifdef CONFIG_SYSCTL 2269 err_reg_ctl: 2270 __devinet_sysctl_unregister(dflt); 2271 err_reg_dflt: 2272 __devinet_sysctl_unregister(all); 2273 err_reg_all: 2274 if (tbl != ctl_forward_entry) 2275 kfree(tbl); 2276 err_alloc_ctl: 2277 #endif 2278 if (dflt != &ipv4_devconf_dflt) 2279 kfree(dflt); 2280 err_alloc_dflt: 2281 if (all != &ipv4_devconf) 2282 kfree(all); 2283 err_alloc_all: 2284 return err; 2285 } 2286 2287 static __net_exit void devinet_exit_net(struct net *net) 2288 { 2289 #ifdef CONFIG_SYSCTL 2290 struct ctl_table *tbl; 2291 2292 tbl = net->ipv4.forw_hdr->ctl_table_arg; 2293 unregister_net_sysctl_table(net->ipv4.forw_hdr); 2294 __devinet_sysctl_unregister(net->ipv4.devconf_dflt); 2295 __devinet_sysctl_unregister(net->ipv4.devconf_all); 2296 kfree(tbl); 2297 #endif 2298 kfree(net->ipv4.devconf_dflt); 2299 kfree(net->ipv4.devconf_all); 2300 } 2301 2302 static __net_initdata struct pernet_operations devinet_ops = { 2303 .init = devinet_init_net, 2304 .exit = devinet_exit_net, 2305 }; 2306 2307 static struct rtnl_af_ops inet_af_ops = { 2308 .family = AF_INET, 2309 .fill_link_af = inet_fill_link_af, 2310 .get_link_af_size = inet_get_link_af_size, 2311 .validate_link_af = inet_validate_link_af, 2312 .set_link_af = inet_set_link_af, 2313 }; 2314 2315 void __init devinet_init(void) 2316 { 2317 int i; 2318 2319 for (i = 0; i < IN4_ADDR_HSIZE; i++) 2320 INIT_HLIST_HEAD(&inet_addr_lst[i]); 2321 2322 register_pernet_subsys(&devinet_ops); 2323 2324 register_gifconf(PF_INET, inet_gifconf); 2325 register_netdevice_notifier(&ip_netdev_notifier); 2326 2327 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); 2328 2329 rtnl_af_register(&inet_af_ops); 2330 2331 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); 2332 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); 2333 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); 2334 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, 2335 inet_netconf_dump_devconf, NULL); 2336 } 2337 2338