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 schedule_delayed_work(&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 schedule_delayed_work(&check_lifetime_work, next_sched - now); 688 } 689 690 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, 691 __u32 prefered_lft) 692 { 693 unsigned long timeout; 694 695 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); 696 697 timeout = addrconf_timeout_fixup(valid_lft, HZ); 698 if (addrconf_finite_timeout(timeout)) 699 ifa->ifa_valid_lft = timeout; 700 else 701 ifa->ifa_flags |= IFA_F_PERMANENT; 702 703 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 704 if (addrconf_finite_timeout(timeout)) { 705 if (timeout == 0) 706 ifa->ifa_flags |= IFA_F_DEPRECATED; 707 ifa->ifa_preferred_lft = timeout; 708 } 709 ifa->ifa_tstamp = jiffies; 710 if (!ifa->ifa_cstamp) 711 ifa->ifa_cstamp = ifa->ifa_tstamp; 712 } 713 714 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, 715 __u32 *pvalid_lft, __u32 *pprefered_lft) 716 { 717 struct nlattr *tb[IFA_MAX+1]; 718 struct in_ifaddr *ifa; 719 struct ifaddrmsg *ifm; 720 struct net_device *dev; 721 struct in_device *in_dev; 722 int err; 723 724 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 725 if (err < 0) 726 goto errout; 727 728 ifm = nlmsg_data(nlh); 729 err = -EINVAL; 730 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) 731 goto errout; 732 733 dev = __dev_get_by_index(net, ifm->ifa_index); 734 err = -ENODEV; 735 if (dev == NULL) 736 goto errout; 737 738 in_dev = __in_dev_get_rtnl(dev); 739 err = -ENOBUFS; 740 if (in_dev == NULL) 741 goto errout; 742 743 ifa = inet_alloc_ifa(); 744 if (ifa == NULL) 745 /* 746 * A potential indev allocation can be left alive, it stays 747 * assigned to its device and is destroy with it. 748 */ 749 goto errout; 750 751 ipv4_devconf_setall(in_dev); 752 neigh_parms_data_state_setall(in_dev->arp_parms); 753 in_dev_hold(in_dev); 754 755 if (tb[IFA_ADDRESS] == NULL) 756 tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 757 758 INIT_HLIST_NODE(&ifa->hash); 759 ifa->ifa_prefixlen = ifm->ifa_prefixlen; 760 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 761 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : 762 ifm->ifa_flags; 763 ifa->ifa_scope = ifm->ifa_scope; 764 ifa->ifa_dev = in_dev; 765 766 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); 767 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); 768 769 if (tb[IFA_BROADCAST]) 770 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); 771 772 if (tb[IFA_LABEL]) 773 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 774 else 775 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 776 777 if (tb[IFA_CACHEINFO]) { 778 struct ifa_cacheinfo *ci; 779 780 ci = nla_data(tb[IFA_CACHEINFO]); 781 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { 782 err = -EINVAL; 783 goto errout_free; 784 } 785 *pvalid_lft = ci->ifa_valid; 786 *pprefered_lft = ci->ifa_prefered; 787 } 788 789 return ifa; 790 791 errout_free: 792 inet_free_ifa(ifa); 793 errout: 794 return ERR_PTR(err); 795 } 796 797 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) 798 { 799 struct in_device *in_dev = ifa->ifa_dev; 800 struct in_ifaddr *ifa1, **ifap; 801 802 if (!ifa->ifa_local) 803 return NULL; 804 805 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 806 ifap = &ifa1->ifa_next) { 807 if (ifa1->ifa_mask == ifa->ifa_mask && 808 inet_ifa_match(ifa1->ifa_address, ifa) && 809 ifa1->ifa_local == ifa->ifa_local) 810 return ifa1; 811 } 812 return NULL; 813 } 814 815 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 816 { 817 struct net *net = sock_net(skb->sk); 818 struct in_ifaddr *ifa; 819 struct in_ifaddr *ifa_existing; 820 __u32 valid_lft = INFINITY_LIFE_TIME; 821 __u32 prefered_lft = INFINITY_LIFE_TIME; 822 823 ASSERT_RTNL(); 824 825 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft); 826 if (IS_ERR(ifa)) 827 return PTR_ERR(ifa); 828 829 ifa_existing = find_matching_ifa(ifa); 830 if (!ifa_existing) { 831 /* It would be best to check for !NLM_F_CREATE here but 832 * userspace alreay relies on not having to provide this. 833 */ 834 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 835 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid); 836 } else { 837 inet_free_ifa(ifa); 838 839 if (nlh->nlmsg_flags & NLM_F_EXCL || 840 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 841 return -EEXIST; 842 ifa = ifa_existing; 843 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 844 cancel_delayed_work(&check_lifetime_work); 845 schedule_delayed_work(&check_lifetime_work, 0); 846 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); 847 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 848 } 849 return 0; 850 } 851 852 /* 853 * Determine a default network mask, based on the IP address. 854 */ 855 856 static int inet_abc_len(__be32 addr) 857 { 858 int rc = -1; /* Something else, probably a multicast. */ 859 860 if (ipv4_is_zeronet(addr)) 861 rc = 0; 862 else { 863 __u32 haddr = ntohl(addr); 864 865 if (IN_CLASSA(haddr)) 866 rc = 8; 867 else if (IN_CLASSB(haddr)) 868 rc = 16; 869 else if (IN_CLASSC(haddr)) 870 rc = 24; 871 } 872 873 return rc; 874 } 875 876 877 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) 878 { 879 struct ifreq ifr; 880 struct sockaddr_in sin_orig; 881 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; 882 struct in_device *in_dev; 883 struct in_ifaddr **ifap = NULL; 884 struct in_ifaddr *ifa = NULL; 885 struct net_device *dev; 886 char *colon; 887 int ret = -EFAULT; 888 int tryaddrmatch = 0; 889 890 /* 891 * Fetch the caller's info block into kernel space 892 */ 893 894 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 895 goto out; 896 ifr.ifr_name[IFNAMSIZ - 1] = 0; 897 898 /* save original address for comparison */ 899 memcpy(&sin_orig, sin, sizeof(*sin)); 900 901 colon = strchr(ifr.ifr_name, ':'); 902 if (colon) 903 *colon = 0; 904 905 dev_load(net, ifr.ifr_name); 906 907 switch (cmd) { 908 case SIOCGIFADDR: /* Get interface address */ 909 case SIOCGIFBRDADDR: /* Get the broadcast address */ 910 case SIOCGIFDSTADDR: /* Get the destination address */ 911 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 912 /* Note that these ioctls will not sleep, 913 so that we do not impose a lock. 914 One day we will be forced to put shlock here (I mean SMP) 915 */ 916 tryaddrmatch = (sin_orig.sin_family == AF_INET); 917 memset(sin, 0, sizeof(*sin)); 918 sin->sin_family = AF_INET; 919 break; 920 921 case SIOCSIFFLAGS: 922 ret = -EPERM; 923 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 924 goto out; 925 break; 926 case SIOCSIFADDR: /* Set interface address (and family) */ 927 case SIOCSIFBRDADDR: /* Set the broadcast address */ 928 case SIOCSIFDSTADDR: /* Set the destination address */ 929 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 930 ret = -EPERM; 931 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 932 goto out; 933 ret = -EINVAL; 934 if (sin->sin_family != AF_INET) 935 goto out; 936 break; 937 default: 938 ret = -EINVAL; 939 goto out; 940 } 941 942 rtnl_lock(); 943 944 ret = -ENODEV; 945 dev = __dev_get_by_name(net, ifr.ifr_name); 946 if (!dev) 947 goto done; 948 949 if (colon) 950 *colon = ':'; 951 952 in_dev = __in_dev_get_rtnl(dev); 953 if (in_dev) { 954 if (tryaddrmatch) { 955 /* Matthias Andree */ 956 /* compare label and address (4.4BSD style) */ 957 /* note: we only do this for a limited set of ioctls 958 and only if the original address family was AF_INET. 959 This is checked above. */ 960 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 961 ifap = &ifa->ifa_next) { 962 if (!strcmp(ifr.ifr_name, ifa->ifa_label) && 963 sin_orig.sin_addr.s_addr == 964 ifa->ifa_local) { 965 break; /* found */ 966 } 967 } 968 } 969 /* we didn't get a match, maybe the application is 970 4.3BSD-style and passed in junk so we fall back to 971 comparing just the label */ 972 if (!ifa) { 973 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 974 ifap = &ifa->ifa_next) 975 if (!strcmp(ifr.ifr_name, ifa->ifa_label)) 976 break; 977 } 978 } 979 980 ret = -EADDRNOTAVAIL; 981 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 982 goto done; 983 984 switch (cmd) { 985 case SIOCGIFADDR: /* Get interface address */ 986 sin->sin_addr.s_addr = ifa->ifa_local; 987 goto rarok; 988 989 case SIOCGIFBRDADDR: /* Get the broadcast address */ 990 sin->sin_addr.s_addr = ifa->ifa_broadcast; 991 goto rarok; 992 993 case SIOCGIFDSTADDR: /* Get the destination address */ 994 sin->sin_addr.s_addr = ifa->ifa_address; 995 goto rarok; 996 997 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 998 sin->sin_addr.s_addr = ifa->ifa_mask; 999 goto rarok; 1000 1001 case SIOCSIFFLAGS: 1002 if (colon) { 1003 ret = -EADDRNOTAVAIL; 1004 if (!ifa) 1005 break; 1006 ret = 0; 1007 if (!(ifr.ifr_flags & IFF_UP)) 1008 inet_del_ifa(in_dev, ifap, 1); 1009 break; 1010 } 1011 ret = dev_change_flags(dev, ifr.ifr_flags); 1012 break; 1013 1014 case SIOCSIFADDR: /* Set interface address (and family) */ 1015 ret = -EINVAL; 1016 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1017 break; 1018 1019 if (!ifa) { 1020 ret = -ENOBUFS; 1021 ifa = inet_alloc_ifa(); 1022 if (!ifa) 1023 break; 1024 INIT_HLIST_NODE(&ifa->hash); 1025 if (colon) 1026 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); 1027 else 1028 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1029 } else { 1030 ret = 0; 1031 if (ifa->ifa_local == sin->sin_addr.s_addr) 1032 break; 1033 inet_del_ifa(in_dev, ifap, 0); 1034 ifa->ifa_broadcast = 0; 1035 ifa->ifa_scope = 0; 1036 } 1037 1038 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 1039 1040 if (!(dev->flags & IFF_POINTOPOINT)) { 1041 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 1042 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 1043 if ((dev->flags & IFF_BROADCAST) && 1044 ifa->ifa_prefixlen < 31) 1045 ifa->ifa_broadcast = ifa->ifa_address | 1046 ~ifa->ifa_mask; 1047 } else { 1048 ifa->ifa_prefixlen = 32; 1049 ifa->ifa_mask = inet_make_mask(32); 1050 } 1051 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 1052 ret = inet_set_ifa(dev, ifa); 1053 break; 1054 1055 case SIOCSIFBRDADDR: /* Set the broadcast address */ 1056 ret = 0; 1057 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 1058 inet_del_ifa(in_dev, ifap, 0); 1059 ifa->ifa_broadcast = sin->sin_addr.s_addr; 1060 inet_insert_ifa(ifa); 1061 } 1062 break; 1063 1064 case SIOCSIFDSTADDR: /* Set the destination address */ 1065 ret = 0; 1066 if (ifa->ifa_address == sin->sin_addr.s_addr) 1067 break; 1068 ret = -EINVAL; 1069 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1070 break; 1071 ret = 0; 1072 inet_del_ifa(in_dev, ifap, 0); 1073 ifa->ifa_address = sin->sin_addr.s_addr; 1074 inet_insert_ifa(ifa); 1075 break; 1076 1077 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 1078 1079 /* 1080 * The mask we set must be legal. 1081 */ 1082 ret = -EINVAL; 1083 if (bad_mask(sin->sin_addr.s_addr, 0)) 1084 break; 1085 ret = 0; 1086 if (ifa->ifa_mask != sin->sin_addr.s_addr) { 1087 __be32 old_mask = ifa->ifa_mask; 1088 inet_del_ifa(in_dev, ifap, 0); 1089 ifa->ifa_mask = sin->sin_addr.s_addr; 1090 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 1091 1092 /* See if current broadcast address matches 1093 * with current netmask, then recalculate 1094 * the broadcast address. Otherwise it's a 1095 * funny address, so don't touch it since 1096 * the user seems to know what (s)he's doing... 1097 */ 1098 if ((dev->flags & IFF_BROADCAST) && 1099 (ifa->ifa_prefixlen < 31) && 1100 (ifa->ifa_broadcast == 1101 (ifa->ifa_local|~old_mask))) { 1102 ifa->ifa_broadcast = (ifa->ifa_local | 1103 ~sin->sin_addr.s_addr); 1104 } 1105 inet_insert_ifa(ifa); 1106 } 1107 break; 1108 } 1109 done: 1110 rtnl_unlock(); 1111 out: 1112 return ret; 1113 rarok: 1114 rtnl_unlock(); 1115 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; 1116 goto out; 1117 } 1118 1119 static int inet_gifconf(struct net_device *dev, char __user *buf, int len) 1120 { 1121 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1122 struct in_ifaddr *ifa; 1123 struct ifreq ifr; 1124 int done = 0; 1125 1126 if (!in_dev) 1127 goto out; 1128 1129 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1130 if (!buf) { 1131 done += sizeof(ifr); 1132 continue; 1133 } 1134 if (len < (int) sizeof(ifr)) 1135 break; 1136 memset(&ifr, 0, sizeof(struct ifreq)); 1137 strcpy(ifr.ifr_name, ifa->ifa_label); 1138 1139 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 1140 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 1141 ifa->ifa_local; 1142 1143 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { 1144 done = -EFAULT; 1145 break; 1146 } 1147 buf += sizeof(struct ifreq); 1148 len -= sizeof(struct ifreq); 1149 done += sizeof(struct ifreq); 1150 } 1151 out: 1152 return done; 1153 } 1154 1155 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 1156 { 1157 __be32 addr = 0; 1158 struct in_device *in_dev; 1159 struct net *net = dev_net(dev); 1160 1161 rcu_read_lock(); 1162 in_dev = __in_dev_get_rcu(dev); 1163 if (!in_dev) 1164 goto no_in_dev; 1165 1166 for_primary_ifa(in_dev) { 1167 if (ifa->ifa_scope > scope) 1168 continue; 1169 if (!dst || inet_ifa_match(dst, ifa)) { 1170 addr = ifa->ifa_local; 1171 break; 1172 } 1173 if (!addr) 1174 addr = ifa->ifa_local; 1175 } endfor_ifa(in_dev); 1176 1177 if (addr) 1178 goto out_unlock; 1179 no_in_dev: 1180 1181 /* Not loopback addresses on loopback should be preferred 1182 in this case. It is importnat that lo is the first interface 1183 in dev_base list. 1184 */ 1185 for_each_netdev_rcu(net, dev) { 1186 in_dev = __in_dev_get_rcu(dev); 1187 if (!in_dev) 1188 continue; 1189 1190 for_primary_ifa(in_dev) { 1191 if (ifa->ifa_scope != RT_SCOPE_LINK && 1192 ifa->ifa_scope <= scope) { 1193 addr = ifa->ifa_local; 1194 goto out_unlock; 1195 } 1196 } endfor_ifa(in_dev); 1197 } 1198 out_unlock: 1199 rcu_read_unlock(); 1200 return addr; 1201 } 1202 EXPORT_SYMBOL(inet_select_addr); 1203 1204 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 1205 __be32 local, int scope) 1206 { 1207 int same = 0; 1208 __be32 addr = 0; 1209 1210 for_ifa(in_dev) { 1211 if (!addr && 1212 (local == ifa->ifa_local || !local) && 1213 ifa->ifa_scope <= scope) { 1214 addr = ifa->ifa_local; 1215 if (same) 1216 break; 1217 } 1218 if (!same) { 1219 same = (!local || inet_ifa_match(local, ifa)) && 1220 (!dst || inet_ifa_match(dst, ifa)); 1221 if (same && addr) { 1222 if (local || !dst) 1223 break; 1224 /* Is the selected addr into dst subnet? */ 1225 if (inet_ifa_match(addr, ifa)) 1226 break; 1227 /* No, then can we use new local src? */ 1228 if (ifa->ifa_scope <= scope) { 1229 addr = ifa->ifa_local; 1230 break; 1231 } 1232 /* search for large dst subnet for addr */ 1233 same = 0; 1234 } 1235 } 1236 } endfor_ifa(in_dev); 1237 1238 return same ? addr : 0; 1239 } 1240 1241 /* 1242 * Confirm that local IP address exists using wildcards: 1243 * - net: netns to check, cannot be NULL 1244 * - in_dev: only on this interface, NULL=any interface 1245 * - dst: only in the same subnet as dst, 0=any dst 1246 * - local: address, 0=autoselect the local address 1247 * - scope: maximum allowed scope value for the local address 1248 */ 1249 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, 1250 __be32 dst, __be32 local, int scope) 1251 { 1252 __be32 addr = 0; 1253 struct net_device *dev; 1254 1255 if (in_dev != NULL) 1256 return confirm_addr_indev(in_dev, dst, local, scope); 1257 1258 rcu_read_lock(); 1259 for_each_netdev_rcu(net, dev) { 1260 in_dev = __in_dev_get_rcu(dev); 1261 if (in_dev) { 1262 addr = confirm_addr_indev(in_dev, dst, local, scope); 1263 if (addr) 1264 break; 1265 } 1266 } 1267 rcu_read_unlock(); 1268 1269 return addr; 1270 } 1271 EXPORT_SYMBOL(inet_confirm_addr); 1272 1273 /* 1274 * Device notifier 1275 */ 1276 1277 int register_inetaddr_notifier(struct notifier_block *nb) 1278 { 1279 return blocking_notifier_chain_register(&inetaddr_chain, nb); 1280 } 1281 EXPORT_SYMBOL(register_inetaddr_notifier); 1282 1283 int unregister_inetaddr_notifier(struct notifier_block *nb) 1284 { 1285 return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 1286 } 1287 EXPORT_SYMBOL(unregister_inetaddr_notifier); 1288 1289 /* Rename ifa_labels for a device name change. Make some effort to preserve 1290 * existing alias numbering and to create unique labels if possible. 1291 */ 1292 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 1293 { 1294 struct in_ifaddr *ifa; 1295 int named = 0; 1296 1297 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1298 char old[IFNAMSIZ], *dot; 1299 1300 memcpy(old, ifa->ifa_label, IFNAMSIZ); 1301 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1302 if (named++ == 0) 1303 goto skip; 1304 dot = strchr(old, ':'); 1305 if (dot == NULL) { 1306 sprintf(old, ":%d", named); 1307 dot = old; 1308 } 1309 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) 1310 strcat(ifa->ifa_label, dot); 1311 else 1312 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 1313 skip: 1314 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 1315 } 1316 } 1317 1318 static bool inetdev_valid_mtu(unsigned int mtu) 1319 { 1320 return mtu >= 68; 1321 } 1322 1323 static void inetdev_send_gratuitous_arp(struct net_device *dev, 1324 struct in_device *in_dev) 1325 1326 { 1327 struct in_ifaddr *ifa; 1328 1329 for (ifa = in_dev->ifa_list; ifa; 1330 ifa = ifa->ifa_next) { 1331 arp_send(ARPOP_REQUEST, ETH_P_ARP, 1332 ifa->ifa_local, dev, 1333 ifa->ifa_local, NULL, 1334 dev->dev_addr, NULL); 1335 } 1336 } 1337 1338 /* Called only under RTNL semaphore */ 1339 1340 static int inetdev_event(struct notifier_block *this, unsigned long event, 1341 void *ptr) 1342 { 1343 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1344 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1345 1346 ASSERT_RTNL(); 1347 1348 if (!in_dev) { 1349 if (event == NETDEV_REGISTER) { 1350 in_dev = inetdev_init(dev); 1351 if (!in_dev) 1352 return notifier_from_errno(-ENOMEM); 1353 if (dev->flags & IFF_LOOPBACK) { 1354 IN_DEV_CONF_SET(in_dev, NOXFRM, 1); 1355 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); 1356 } 1357 } else if (event == NETDEV_CHANGEMTU) { 1358 /* Re-enabling IP */ 1359 if (inetdev_valid_mtu(dev->mtu)) 1360 in_dev = inetdev_init(dev); 1361 } 1362 goto out; 1363 } 1364 1365 switch (event) { 1366 case NETDEV_REGISTER: 1367 pr_debug("%s: bug\n", __func__); 1368 RCU_INIT_POINTER(dev->ip_ptr, NULL); 1369 break; 1370 case NETDEV_UP: 1371 if (!inetdev_valid_mtu(dev->mtu)) 1372 break; 1373 if (dev->flags & IFF_LOOPBACK) { 1374 struct in_ifaddr *ifa = inet_alloc_ifa(); 1375 1376 if (ifa) { 1377 INIT_HLIST_NODE(&ifa->hash); 1378 ifa->ifa_local = 1379 ifa->ifa_address = htonl(INADDR_LOOPBACK); 1380 ifa->ifa_prefixlen = 8; 1381 ifa->ifa_mask = inet_make_mask(8); 1382 in_dev_hold(in_dev); 1383 ifa->ifa_dev = in_dev; 1384 ifa->ifa_scope = RT_SCOPE_HOST; 1385 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1386 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, 1387 INFINITY_LIFE_TIME); 1388 ipv4_devconf_setall(in_dev); 1389 neigh_parms_data_state_setall(in_dev->arp_parms); 1390 inet_insert_ifa(ifa); 1391 } 1392 } 1393 ip_mc_up(in_dev); 1394 /* fall through */ 1395 case NETDEV_CHANGEADDR: 1396 if (!IN_DEV_ARP_NOTIFY(in_dev)) 1397 break; 1398 /* fall through */ 1399 case NETDEV_NOTIFY_PEERS: 1400 /* Send gratuitous ARP to notify of link change */ 1401 inetdev_send_gratuitous_arp(dev, in_dev); 1402 break; 1403 case NETDEV_DOWN: 1404 ip_mc_down(in_dev); 1405 break; 1406 case NETDEV_PRE_TYPE_CHANGE: 1407 ip_mc_unmap(in_dev); 1408 break; 1409 case NETDEV_POST_TYPE_CHANGE: 1410 ip_mc_remap(in_dev); 1411 break; 1412 case NETDEV_CHANGEMTU: 1413 if (inetdev_valid_mtu(dev->mtu)) 1414 break; 1415 /* disable IP when MTU is not enough */ 1416 case NETDEV_UNREGISTER: 1417 inetdev_destroy(in_dev); 1418 break; 1419 case NETDEV_CHANGENAME: 1420 /* Do not notify about label change, this event is 1421 * not interesting to applications using netlink. 1422 */ 1423 inetdev_changename(dev, in_dev); 1424 1425 devinet_sysctl_unregister(in_dev); 1426 devinet_sysctl_register(in_dev); 1427 break; 1428 } 1429 out: 1430 return NOTIFY_DONE; 1431 } 1432 1433 static struct notifier_block ip_netdev_notifier = { 1434 .notifier_call = inetdev_event, 1435 }; 1436 1437 static size_t inet_nlmsg_size(void) 1438 { 1439 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1440 + nla_total_size(4) /* IFA_ADDRESS */ 1441 + nla_total_size(4) /* IFA_LOCAL */ 1442 + nla_total_size(4) /* IFA_BROADCAST */ 1443 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ 1444 + nla_total_size(4); /* IFA_FLAGS */ 1445 } 1446 1447 static inline u32 cstamp_delta(unsigned long cstamp) 1448 { 1449 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 1450 } 1451 1452 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 1453 unsigned long tstamp, u32 preferred, u32 valid) 1454 { 1455 struct ifa_cacheinfo ci; 1456 1457 ci.cstamp = cstamp_delta(cstamp); 1458 ci.tstamp = cstamp_delta(tstamp); 1459 ci.ifa_prefered = preferred; 1460 ci.ifa_valid = valid; 1461 1462 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 1463 } 1464 1465 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1466 u32 portid, u32 seq, int event, unsigned int flags) 1467 { 1468 struct ifaddrmsg *ifm; 1469 struct nlmsghdr *nlh; 1470 u32 preferred, valid; 1471 1472 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); 1473 if (nlh == NULL) 1474 return -EMSGSIZE; 1475 1476 ifm = nlmsg_data(nlh); 1477 ifm->ifa_family = AF_INET; 1478 ifm->ifa_prefixlen = ifa->ifa_prefixlen; 1479 ifm->ifa_flags = ifa->ifa_flags; 1480 ifm->ifa_scope = ifa->ifa_scope; 1481 ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 1482 1483 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { 1484 preferred = ifa->ifa_preferred_lft; 1485 valid = ifa->ifa_valid_lft; 1486 if (preferred != INFINITY_LIFE_TIME) { 1487 long tval = (jiffies - ifa->ifa_tstamp) / HZ; 1488 1489 if (preferred > tval) 1490 preferred -= tval; 1491 else 1492 preferred = 0; 1493 if (valid != INFINITY_LIFE_TIME) { 1494 if (valid > tval) 1495 valid -= tval; 1496 else 1497 valid = 0; 1498 } 1499 } 1500 } else { 1501 preferred = INFINITY_LIFE_TIME; 1502 valid = INFINITY_LIFE_TIME; 1503 } 1504 if ((ifa->ifa_address && 1505 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) || 1506 (ifa->ifa_local && 1507 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) || 1508 (ifa->ifa_broadcast && 1509 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || 1510 (ifa->ifa_label[0] && 1511 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || 1512 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) || 1513 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, 1514 preferred, valid)) 1515 goto nla_put_failure; 1516 1517 return nlmsg_end(skb, nlh); 1518 1519 nla_put_failure: 1520 nlmsg_cancel(skb, nlh); 1521 return -EMSGSIZE; 1522 } 1523 1524 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1525 { 1526 struct net *net = sock_net(skb->sk); 1527 int h, s_h; 1528 int idx, s_idx; 1529 int ip_idx, s_ip_idx; 1530 struct net_device *dev; 1531 struct in_device *in_dev; 1532 struct in_ifaddr *ifa; 1533 struct hlist_head *head; 1534 1535 s_h = cb->args[0]; 1536 s_idx = idx = cb->args[1]; 1537 s_ip_idx = ip_idx = cb->args[2]; 1538 1539 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1540 idx = 0; 1541 head = &net->dev_index_head[h]; 1542 rcu_read_lock(); 1543 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1544 net->dev_base_seq; 1545 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1546 if (idx < s_idx) 1547 goto cont; 1548 if (h > s_h || idx > s_idx) 1549 s_ip_idx = 0; 1550 in_dev = __in_dev_get_rcu(dev); 1551 if (!in_dev) 1552 goto cont; 1553 1554 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 1555 ifa = ifa->ifa_next, ip_idx++) { 1556 if (ip_idx < s_ip_idx) 1557 continue; 1558 if (inet_fill_ifaddr(skb, ifa, 1559 NETLINK_CB(cb->skb).portid, 1560 cb->nlh->nlmsg_seq, 1561 RTM_NEWADDR, NLM_F_MULTI) <= 0) { 1562 rcu_read_unlock(); 1563 goto done; 1564 } 1565 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1566 } 1567 cont: 1568 idx++; 1569 } 1570 rcu_read_unlock(); 1571 } 1572 1573 done: 1574 cb->args[0] = h; 1575 cb->args[1] = idx; 1576 cb->args[2] = ip_idx; 1577 1578 return skb->len; 1579 } 1580 1581 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, 1582 u32 portid) 1583 { 1584 struct sk_buff *skb; 1585 u32 seq = nlh ? nlh->nlmsg_seq : 0; 1586 int err = -ENOBUFS; 1587 struct net *net; 1588 1589 net = dev_net(ifa->ifa_dev->dev); 1590 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1591 if (skb == NULL) 1592 goto errout; 1593 1594 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0); 1595 if (err < 0) { 1596 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1597 WARN_ON(err == -EMSGSIZE); 1598 kfree_skb(skb); 1599 goto errout; 1600 } 1601 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1602 return; 1603 errout: 1604 if (err < 0) 1605 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); 1606 } 1607 1608 static size_t inet_get_link_af_size(const struct net_device *dev) 1609 { 1610 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1611 1612 if (!in_dev) 1613 return 0; 1614 1615 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ 1616 } 1617 1618 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 1619 { 1620 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1621 struct nlattr *nla; 1622 int i; 1623 1624 if (!in_dev) 1625 return -ENODATA; 1626 1627 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); 1628 if (nla == NULL) 1629 return -EMSGSIZE; 1630 1631 for (i = 0; i < IPV4_DEVCONF_MAX; i++) 1632 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; 1633 1634 return 0; 1635 } 1636 1637 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { 1638 [IFLA_INET_CONF] = { .type = NLA_NESTED }, 1639 }; 1640 1641 static int inet_validate_link_af(const struct net_device *dev, 1642 const struct nlattr *nla) 1643 { 1644 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1645 int err, rem; 1646 1647 if (dev && !__in_dev_get_rtnl(dev)) 1648 return -EAFNOSUPPORT; 1649 1650 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); 1651 if (err < 0) 1652 return err; 1653 1654 if (tb[IFLA_INET_CONF]) { 1655 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { 1656 int cfgid = nla_type(a); 1657 1658 if (nla_len(a) < 4) 1659 return -EINVAL; 1660 1661 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) 1662 return -EINVAL; 1663 } 1664 } 1665 1666 return 0; 1667 } 1668 1669 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) 1670 { 1671 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1672 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1673 int rem; 1674 1675 if (!in_dev) 1676 return -EAFNOSUPPORT; 1677 1678 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) 1679 BUG(); 1680 1681 if (tb[IFLA_INET_CONF]) { 1682 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) 1683 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); 1684 } 1685 1686 return 0; 1687 } 1688 1689 static int inet_netconf_msgsize_devconf(int type) 1690 { 1691 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1692 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1693 1694 /* type -1 is used for ALL */ 1695 if (type == -1 || type == NETCONFA_FORWARDING) 1696 size += nla_total_size(4); 1697 if (type == -1 || type == NETCONFA_RP_FILTER) 1698 size += nla_total_size(4); 1699 if (type == -1 || type == NETCONFA_MC_FORWARDING) 1700 size += nla_total_size(4); 1701 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 1702 size += nla_total_size(4); 1703 1704 return size; 1705 } 1706 1707 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 1708 struct ipv4_devconf *devconf, u32 portid, 1709 u32 seq, int event, unsigned int flags, 1710 int type) 1711 { 1712 struct nlmsghdr *nlh; 1713 struct netconfmsg *ncm; 1714 1715 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1716 flags); 1717 if (nlh == NULL) 1718 return -EMSGSIZE; 1719 1720 ncm = nlmsg_data(nlh); 1721 ncm->ncm_family = AF_INET; 1722 1723 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 1724 goto nla_put_failure; 1725 1726 /* type -1 is used for ALL */ 1727 if ((type == -1 || type == NETCONFA_FORWARDING) && 1728 nla_put_s32(skb, NETCONFA_FORWARDING, 1729 IPV4_DEVCONF(*devconf, FORWARDING)) < 0) 1730 goto nla_put_failure; 1731 if ((type == -1 || type == NETCONFA_RP_FILTER) && 1732 nla_put_s32(skb, NETCONFA_RP_FILTER, 1733 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) 1734 goto nla_put_failure; 1735 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 1736 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 1737 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) 1738 goto nla_put_failure; 1739 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 1740 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 1741 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0) 1742 goto nla_put_failure; 1743 1744 return nlmsg_end(skb, nlh); 1745 1746 nla_put_failure: 1747 nlmsg_cancel(skb, nlh); 1748 return -EMSGSIZE; 1749 } 1750 1751 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex, 1752 struct ipv4_devconf *devconf) 1753 { 1754 struct sk_buff *skb; 1755 int err = -ENOBUFS; 1756 1757 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC); 1758 if (skb == NULL) 1759 goto errout; 1760 1761 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 1762 RTM_NEWNETCONF, 0, type); 1763 if (err < 0) { 1764 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1765 WARN_ON(err == -EMSGSIZE); 1766 kfree_skb(skb); 1767 goto errout; 1768 } 1769 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC); 1770 return; 1771 errout: 1772 if (err < 0) 1773 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); 1774 } 1775 1776 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { 1777 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1778 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 1779 [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, 1780 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 1781 }; 1782 1783 static int inet_netconf_get_devconf(struct sk_buff *in_skb, 1784 struct nlmsghdr *nlh) 1785 { 1786 struct net *net = sock_net(in_skb->sk); 1787 struct nlattr *tb[NETCONFA_MAX+1]; 1788 struct netconfmsg *ncm; 1789 struct sk_buff *skb; 1790 struct ipv4_devconf *devconf; 1791 struct in_device *in_dev; 1792 struct net_device *dev; 1793 int ifindex; 1794 int err; 1795 1796 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 1797 devconf_ipv4_policy); 1798 if (err < 0) 1799 goto errout; 1800 1801 err = EINVAL; 1802 if (!tb[NETCONFA_IFINDEX]) 1803 goto errout; 1804 1805 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1806 switch (ifindex) { 1807 case NETCONFA_IFINDEX_ALL: 1808 devconf = net->ipv4.devconf_all; 1809 break; 1810 case NETCONFA_IFINDEX_DEFAULT: 1811 devconf = net->ipv4.devconf_dflt; 1812 break; 1813 default: 1814 dev = __dev_get_by_index(net, ifindex); 1815 if (dev == NULL) 1816 goto errout; 1817 in_dev = __in_dev_get_rtnl(dev); 1818 if (in_dev == NULL) 1819 goto errout; 1820 devconf = &in_dev->cnf; 1821 break; 1822 } 1823 1824 err = -ENOBUFS; 1825 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC); 1826 if (skb == NULL) 1827 goto errout; 1828 1829 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 1830 NETLINK_CB(in_skb).portid, 1831 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1832 -1); 1833 if (err < 0) { 1834 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1835 WARN_ON(err == -EMSGSIZE); 1836 kfree_skb(skb); 1837 goto errout; 1838 } 1839 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1840 errout: 1841 return err; 1842 } 1843 1844 static int inet_netconf_dump_devconf(struct sk_buff *skb, 1845 struct netlink_callback *cb) 1846 { 1847 struct net *net = sock_net(skb->sk); 1848 int h, s_h; 1849 int idx, s_idx; 1850 struct net_device *dev; 1851 struct in_device *in_dev; 1852 struct hlist_head *head; 1853 1854 s_h = cb->args[0]; 1855 s_idx = idx = cb->args[1]; 1856 1857 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1858 idx = 0; 1859 head = &net->dev_index_head[h]; 1860 rcu_read_lock(); 1861 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1862 net->dev_base_seq; 1863 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1864 if (idx < s_idx) 1865 goto cont; 1866 in_dev = __in_dev_get_rcu(dev); 1867 if (!in_dev) 1868 goto cont; 1869 1870 if (inet_netconf_fill_devconf(skb, dev->ifindex, 1871 &in_dev->cnf, 1872 NETLINK_CB(cb->skb).portid, 1873 cb->nlh->nlmsg_seq, 1874 RTM_NEWNETCONF, 1875 NLM_F_MULTI, 1876 -1) <= 0) { 1877 rcu_read_unlock(); 1878 goto done; 1879 } 1880 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1881 cont: 1882 idx++; 1883 } 1884 rcu_read_unlock(); 1885 } 1886 if (h == NETDEV_HASHENTRIES) { 1887 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 1888 net->ipv4.devconf_all, 1889 NETLINK_CB(cb->skb).portid, 1890 cb->nlh->nlmsg_seq, 1891 RTM_NEWNETCONF, NLM_F_MULTI, 1892 -1) <= 0) 1893 goto done; 1894 else 1895 h++; 1896 } 1897 if (h == NETDEV_HASHENTRIES + 1) { 1898 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 1899 net->ipv4.devconf_dflt, 1900 NETLINK_CB(cb->skb).portid, 1901 cb->nlh->nlmsg_seq, 1902 RTM_NEWNETCONF, NLM_F_MULTI, 1903 -1) <= 0) 1904 goto done; 1905 else 1906 h++; 1907 } 1908 done: 1909 cb->args[0] = h; 1910 cb->args[1] = idx; 1911 1912 return skb->len; 1913 } 1914 1915 #ifdef CONFIG_SYSCTL 1916 1917 static void devinet_copy_dflt_conf(struct net *net, int i) 1918 { 1919 struct net_device *dev; 1920 1921 rcu_read_lock(); 1922 for_each_netdev_rcu(net, dev) { 1923 struct in_device *in_dev; 1924 1925 in_dev = __in_dev_get_rcu(dev); 1926 if (in_dev && !test_bit(i, in_dev->cnf.state)) 1927 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 1928 } 1929 rcu_read_unlock(); 1930 } 1931 1932 /* called with RTNL locked */ 1933 static void inet_forward_change(struct net *net) 1934 { 1935 struct net_device *dev; 1936 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 1937 1938 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 1939 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 1940 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1941 NETCONFA_IFINDEX_ALL, 1942 net->ipv4.devconf_all); 1943 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1944 NETCONFA_IFINDEX_DEFAULT, 1945 net->ipv4.devconf_dflt); 1946 1947 for_each_netdev(net, dev) { 1948 struct in_device *in_dev; 1949 if (on) 1950 dev_disable_lro(dev); 1951 rcu_read_lock(); 1952 in_dev = __in_dev_get_rcu(dev); 1953 if (in_dev) { 1954 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 1955 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1956 dev->ifindex, &in_dev->cnf); 1957 } 1958 rcu_read_unlock(); 1959 } 1960 } 1961 1962 static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf) 1963 { 1964 if (cnf == net->ipv4.devconf_dflt) 1965 return NETCONFA_IFINDEX_DEFAULT; 1966 else if (cnf == net->ipv4.devconf_all) 1967 return NETCONFA_IFINDEX_ALL; 1968 else { 1969 struct in_device *idev 1970 = container_of(cnf, struct in_device, cnf); 1971 return idev->dev->ifindex; 1972 } 1973 } 1974 1975 static int devinet_conf_proc(struct ctl_table *ctl, int write, 1976 void __user *buffer, 1977 size_t *lenp, loff_t *ppos) 1978 { 1979 int old_value = *(int *)ctl->data; 1980 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1981 int new_value = *(int *)ctl->data; 1982 1983 if (write) { 1984 struct ipv4_devconf *cnf = ctl->extra1; 1985 struct net *net = ctl->extra2; 1986 int i = (int *)ctl->data - cnf->data; 1987 int ifindex; 1988 1989 set_bit(i, cnf->state); 1990 1991 if (cnf == net->ipv4.devconf_dflt) 1992 devinet_copy_dflt_conf(net, i); 1993 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || 1994 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) 1995 if ((new_value == 0) && (old_value != 0)) 1996 rt_cache_flush(net); 1997 1998 if (i == IPV4_DEVCONF_RP_FILTER - 1 && 1999 new_value != old_value) { 2000 ifindex = devinet_conf_ifindex(net, cnf); 2001 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER, 2002 ifindex, cnf); 2003 } 2004 if (i == IPV4_DEVCONF_PROXY_ARP - 1 && 2005 new_value != old_value) { 2006 ifindex = devinet_conf_ifindex(net, cnf); 2007 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 2008 ifindex, cnf); 2009 } 2010 } 2011 2012 return ret; 2013 } 2014 2015 static int devinet_sysctl_forward(struct ctl_table *ctl, int write, 2016 void __user *buffer, 2017 size_t *lenp, loff_t *ppos) 2018 { 2019 int *valp = ctl->data; 2020 int val = *valp; 2021 loff_t pos = *ppos; 2022 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2023 2024 if (write && *valp != val) { 2025 struct net *net = ctl->extra2; 2026 2027 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { 2028 if (!rtnl_trylock()) { 2029 /* Restore the original values before restarting */ 2030 *valp = val; 2031 *ppos = pos; 2032 return restart_syscall(); 2033 } 2034 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { 2035 inet_forward_change(net); 2036 } else { 2037 struct ipv4_devconf *cnf = ctl->extra1; 2038 struct in_device *idev = 2039 container_of(cnf, struct in_device, cnf); 2040 if (*valp) 2041 dev_disable_lro(idev->dev); 2042 inet_netconf_notify_devconf(net, 2043 NETCONFA_FORWARDING, 2044 idev->dev->ifindex, 2045 cnf); 2046 } 2047 rtnl_unlock(); 2048 rt_cache_flush(net); 2049 } else 2050 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 2051 NETCONFA_IFINDEX_DEFAULT, 2052 net->ipv4.devconf_dflt); 2053 } 2054 2055 return ret; 2056 } 2057 2058 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write, 2059 void __user *buffer, 2060 size_t *lenp, loff_t *ppos) 2061 { 2062 int *valp = ctl->data; 2063 int val = *valp; 2064 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2065 struct net *net = ctl->extra2; 2066 2067 if (write && *valp != val) 2068 rt_cache_flush(net); 2069 2070 return ret; 2071 } 2072 2073 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ 2074 { \ 2075 .procname = name, \ 2076 .data = ipv4_devconf.data + \ 2077 IPV4_DEVCONF_ ## attr - 1, \ 2078 .maxlen = sizeof(int), \ 2079 .mode = mval, \ 2080 .proc_handler = proc, \ 2081 .extra1 = &ipv4_devconf, \ 2082 } 2083 2084 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 2085 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) 2086 2087 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 2088 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) 2089 2090 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ 2091 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) 2092 2093 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 2094 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) 2095 2096 static struct devinet_sysctl_table { 2097 struct ctl_table_header *sysctl_header; 2098 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; 2099 } devinet_sysctl = { 2100 .devinet_vars = { 2101 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 2102 devinet_sysctl_forward), 2103 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 2104 2105 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 2106 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 2107 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 2108 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 2109 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 2110 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 2111 "accept_source_route"), 2112 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), 2113 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), 2114 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 2115 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 2116 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 2117 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 2118 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 2119 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 2120 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 2121 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 2122 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 2123 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), 2124 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), 2125 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION, 2126 "force_igmp_version"), 2127 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL, 2128 "igmpv2_unsolicited_report_interval"), 2129 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL, 2130 "igmpv3_unsolicited_report_interval"), 2131 2132 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 2133 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 2134 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 2135 "promote_secondaries"), 2136 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, 2137 "route_localnet"), 2138 }, 2139 }; 2140 2141 static int __devinet_sysctl_register(struct net *net, char *dev_name, 2142 struct ipv4_devconf *p) 2143 { 2144 int i; 2145 struct devinet_sysctl_table *t; 2146 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; 2147 2148 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 2149 if (!t) 2150 goto out; 2151 2152 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 2153 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 2154 t->devinet_vars[i].extra1 = p; 2155 t->devinet_vars[i].extra2 = net; 2156 } 2157 2158 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); 2159 2160 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); 2161 if (!t->sysctl_header) 2162 goto free; 2163 2164 p->sysctl = t; 2165 return 0; 2166 2167 free: 2168 kfree(t); 2169 out: 2170 return -ENOBUFS; 2171 } 2172 2173 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) 2174 { 2175 struct devinet_sysctl_table *t = cnf->sysctl; 2176 2177 if (t == NULL) 2178 return; 2179 2180 cnf->sysctl = NULL; 2181 unregister_net_sysctl_table(t->sysctl_header); 2182 kfree(t); 2183 } 2184 2185 static void devinet_sysctl_register(struct in_device *idev) 2186 { 2187 neigh_sysctl_register(idev->dev, idev->arp_parms, NULL); 2188 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, 2189 &idev->cnf); 2190 } 2191 2192 static void devinet_sysctl_unregister(struct in_device *idev) 2193 { 2194 __devinet_sysctl_unregister(&idev->cnf); 2195 neigh_sysctl_unregister(idev->arp_parms); 2196 } 2197 2198 static struct ctl_table ctl_forward_entry[] = { 2199 { 2200 .procname = "ip_forward", 2201 .data = &ipv4_devconf.data[ 2202 IPV4_DEVCONF_FORWARDING - 1], 2203 .maxlen = sizeof(int), 2204 .mode = 0644, 2205 .proc_handler = devinet_sysctl_forward, 2206 .extra1 = &ipv4_devconf, 2207 .extra2 = &init_net, 2208 }, 2209 { }, 2210 }; 2211 #endif 2212 2213 static __net_init int devinet_init_net(struct net *net) 2214 { 2215 int err; 2216 struct ipv4_devconf *all, *dflt; 2217 #ifdef CONFIG_SYSCTL 2218 struct ctl_table *tbl = ctl_forward_entry; 2219 struct ctl_table_header *forw_hdr; 2220 #endif 2221 2222 err = -ENOMEM; 2223 all = &ipv4_devconf; 2224 dflt = &ipv4_devconf_dflt; 2225 2226 if (!net_eq(net, &init_net)) { 2227 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); 2228 if (all == NULL) 2229 goto err_alloc_all; 2230 2231 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 2232 if (dflt == NULL) 2233 goto err_alloc_dflt; 2234 2235 #ifdef CONFIG_SYSCTL 2236 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); 2237 if (tbl == NULL) 2238 goto err_alloc_ctl; 2239 2240 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; 2241 tbl[0].extra1 = all; 2242 tbl[0].extra2 = net; 2243 #endif 2244 } 2245 2246 #ifdef CONFIG_SYSCTL 2247 err = __devinet_sysctl_register(net, "all", all); 2248 if (err < 0) 2249 goto err_reg_all; 2250 2251 err = __devinet_sysctl_register(net, "default", dflt); 2252 if (err < 0) 2253 goto err_reg_dflt; 2254 2255 err = -ENOMEM; 2256 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); 2257 if (forw_hdr == NULL) 2258 goto err_reg_ctl; 2259 net->ipv4.forw_hdr = forw_hdr; 2260 #endif 2261 2262 net->ipv4.devconf_all = all; 2263 net->ipv4.devconf_dflt = dflt; 2264 return 0; 2265 2266 #ifdef CONFIG_SYSCTL 2267 err_reg_ctl: 2268 __devinet_sysctl_unregister(dflt); 2269 err_reg_dflt: 2270 __devinet_sysctl_unregister(all); 2271 err_reg_all: 2272 if (tbl != ctl_forward_entry) 2273 kfree(tbl); 2274 err_alloc_ctl: 2275 #endif 2276 if (dflt != &ipv4_devconf_dflt) 2277 kfree(dflt); 2278 err_alloc_dflt: 2279 if (all != &ipv4_devconf) 2280 kfree(all); 2281 err_alloc_all: 2282 return err; 2283 } 2284 2285 static __net_exit void devinet_exit_net(struct net *net) 2286 { 2287 #ifdef CONFIG_SYSCTL 2288 struct ctl_table *tbl; 2289 2290 tbl = net->ipv4.forw_hdr->ctl_table_arg; 2291 unregister_net_sysctl_table(net->ipv4.forw_hdr); 2292 __devinet_sysctl_unregister(net->ipv4.devconf_dflt); 2293 __devinet_sysctl_unregister(net->ipv4.devconf_all); 2294 kfree(tbl); 2295 #endif 2296 kfree(net->ipv4.devconf_dflt); 2297 kfree(net->ipv4.devconf_all); 2298 } 2299 2300 static __net_initdata struct pernet_operations devinet_ops = { 2301 .init = devinet_init_net, 2302 .exit = devinet_exit_net, 2303 }; 2304 2305 static struct rtnl_af_ops inet_af_ops = { 2306 .family = AF_INET, 2307 .fill_link_af = inet_fill_link_af, 2308 .get_link_af_size = inet_get_link_af_size, 2309 .validate_link_af = inet_validate_link_af, 2310 .set_link_af = inet_set_link_af, 2311 }; 2312 2313 void __init devinet_init(void) 2314 { 2315 int i; 2316 2317 for (i = 0; i < IN4_ADDR_HSIZE; i++) 2318 INIT_HLIST_HEAD(&inet_addr_lst[i]); 2319 2320 register_pernet_subsys(&devinet_ops); 2321 2322 register_gifconf(PF_INET, inet_gifconf); 2323 register_netdevice_notifier(&ip_netdev_notifier); 2324 2325 schedule_delayed_work(&check_lifetime_work, 0); 2326 2327 rtnl_af_register(&inet_af_ops); 2328 2329 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); 2330 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); 2331 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); 2332 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, 2333 inet_netconf_dump_devconf, NULL); 2334 } 2335 2336