devinet.c revision 73af614aedd221df8495fc8c9993c50e87f899f2
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 70static 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 81static 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 96static 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}; 103 104#define IN4_ADDR_HSIZE_SHIFT 8 105#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT) 106 107static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE]; 108static DEFINE_SPINLOCK(inet_addr_hash_lock); 109 110static u32 inet_addr_hash(struct net *net, __be32 addr) 111{ 112 u32 val = (__force u32) addr ^ net_hash_mix(net); 113 114 return hash_32(val, IN4_ADDR_HSIZE_SHIFT); 115} 116 117static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) 118{ 119 u32 hash = inet_addr_hash(net, ifa->ifa_local); 120 121 spin_lock(&inet_addr_hash_lock); 122 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); 123 spin_unlock(&inet_addr_hash_lock); 124} 125 126static void inet_hash_remove(struct in_ifaddr *ifa) 127{ 128 spin_lock(&inet_addr_hash_lock); 129 hlist_del_init_rcu(&ifa->hash); 130 spin_unlock(&inet_addr_hash_lock); 131} 132 133/** 134 * __ip_dev_find - find the first device with a given source address. 135 * @net: the net namespace 136 * @addr: the source address 137 * @devref: if true, take a reference on the found device 138 * 139 * If a caller uses devref=false, it should be protected by RCU, or RTNL 140 */ 141struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) 142{ 143 u32 hash = inet_addr_hash(net, addr); 144 struct net_device *result = NULL; 145 struct in_ifaddr *ifa; 146 147 rcu_read_lock(); 148 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) { 149 if (ifa->ifa_local == addr) { 150 struct net_device *dev = ifa->ifa_dev->dev; 151 152 if (!net_eq(dev_net(dev), net)) 153 continue; 154 result = dev; 155 break; 156 } 157 } 158 if (!result) { 159 struct flowi4 fl4 = { .daddr = addr }; 160 struct fib_result res = { 0 }; 161 struct fib_table *local; 162 163 /* Fallback to FIB local table so that communication 164 * over loopback subnets work. 165 */ 166 local = fib_get_table(net, RT_TABLE_LOCAL); 167 if (local && 168 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) && 169 res.type == RTN_LOCAL) 170 result = FIB_RES_DEV(res); 171 } 172 if (result && devref) 173 dev_hold(result); 174 rcu_read_unlock(); 175 return result; 176} 177EXPORT_SYMBOL(__ip_dev_find); 178 179static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); 180 181static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); 182static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 183 int destroy); 184#ifdef CONFIG_SYSCTL 185static void devinet_sysctl_register(struct in_device *idev); 186static void devinet_sysctl_unregister(struct in_device *idev); 187#else 188static void devinet_sysctl_register(struct in_device *idev) 189{ 190} 191static void devinet_sysctl_unregister(struct in_device *idev) 192{ 193} 194#endif 195 196/* Locks all the inet devices. */ 197 198static struct in_ifaddr *inet_alloc_ifa(void) 199{ 200 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); 201} 202 203static void inet_rcu_free_ifa(struct rcu_head *head) 204{ 205 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); 206 if (ifa->ifa_dev) 207 in_dev_put(ifa->ifa_dev); 208 kfree(ifa); 209} 210 211static void inet_free_ifa(struct in_ifaddr *ifa) 212{ 213 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); 214} 215 216void in_dev_finish_destroy(struct in_device *idev) 217{ 218 struct net_device *dev = idev->dev; 219 220 WARN_ON(idev->ifa_list); 221 WARN_ON(idev->mc_list); 222 kfree(rcu_dereference_protected(idev->mc_hash, 1)); 223#ifdef NET_REFCNT_DEBUG 224 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL"); 225#endif 226 dev_put(dev); 227 if (!idev->dead) 228 pr_err("Freeing alive in_device %p\n", idev); 229 else 230 kfree(idev); 231} 232EXPORT_SYMBOL(in_dev_finish_destroy); 233 234static struct in_device *inetdev_init(struct net_device *dev) 235{ 236 struct in_device *in_dev; 237 238 ASSERT_RTNL(); 239 240 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); 241 if (!in_dev) 242 goto out; 243 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, 244 sizeof(in_dev->cnf)); 245 in_dev->cnf.sysctl = NULL; 246 in_dev->dev = dev; 247 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); 248 if (!in_dev->arp_parms) 249 goto out_kfree; 250 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) 251 dev_disable_lro(dev); 252 /* Reference in_dev->dev */ 253 dev_hold(dev); 254 /* Account for reference dev->ip_ptr (below) */ 255 in_dev_hold(in_dev); 256 257 devinet_sysctl_register(in_dev); 258 ip_mc_init_dev(in_dev); 259 if (dev->flags & IFF_UP) 260 ip_mc_up(in_dev); 261 262 /* we can receive as soon as ip_ptr is set -- do this last */ 263 rcu_assign_pointer(dev->ip_ptr, in_dev); 264out: 265 return in_dev; 266out_kfree: 267 kfree(in_dev); 268 in_dev = NULL; 269 goto out; 270} 271 272static void in_dev_rcu_put(struct rcu_head *head) 273{ 274 struct in_device *idev = container_of(head, struct in_device, rcu_head); 275 in_dev_put(idev); 276} 277 278static void inetdev_destroy(struct in_device *in_dev) 279{ 280 struct in_ifaddr *ifa; 281 struct net_device *dev; 282 283 ASSERT_RTNL(); 284 285 dev = in_dev->dev; 286 287 in_dev->dead = 1; 288 289 ip_mc_destroy_dev(in_dev); 290 291 while ((ifa = in_dev->ifa_list) != NULL) { 292 inet_del_ifa(in_dev, &in_dev->ifa_list, 0); 293 inet_free_ifa(ifa); 294 } 295 296 RCU_INIT_POINTER(dev->ip_ptr, NULL); 297 298 devinet_sysctl_unregister(in_dev); 299 neigh_parms_release(&arp_tbl, in_dev->arp_parms); 300 arp_ifdown(dev); 301 302 call_rcu(&in_dev->rcu_head, in_dev_rcu_put); 303} 304 305int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) 306{ 307 rcu_read_lock(); 308 for_primary_ifa(in_dev) { 309 if (inet_ifa_match(a, ifa)) { 310 if (!b || inet_ifa_match(b, ifa)) { 311 rcu_read_unlock(); 312 return 1; 313 } 314 } 315 } endfor_ifa(in_dev); 316 rcu_read_unlock(); 317 return 0; 318} 319 320static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 321 int destroy, struct nlmsghdr *nlh, u32 portid) 322{ 323 struct in_ifaddr *promote = NULL; 324 struct in_ifaddr *ifa, *ifa1 = *ifap; 325 struct in_ifaddr *last_prim = in_dev->ifa_list; 326 struct in_ifaddr *prev_prom = NULL; 327 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); 328 329 ASSERT_RTNL(); 330 331 /* 1. Deleting primary ifaddr forces deletion all secondaries 332 * unless alias promotion is set 333 **/ 334 335 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { 336 struct in_ifaddr **ifap1 = &ifa1->ifa_next; 337 338 while ((ifa = *ifap1) != NULL) { 339 if (!(ifa->ifa_flags & IFA_F_SECONDARY) && 340 ifa1->ifa_scope <= ifa->ifa_scope) 341 last_prim = ifa; 342 343 if (!(ifa->ifa_flags & IFA_F_SECONDARY) || 344 ifa1->ifa_mask != ifa->ifa_mask || 345 !inet_ifa_match(ifa1->ifa_address, ifa)) { 346 ifap1 = &ifa->ifa_next; 347 prev_prom = ifa; 348 continue; 349 } 350 351 if (!do_promote) { 352 inet_hash_remove(ifa); 353 *ifap1 = ifa->ifa_next; 354 355 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid); 356 blocking_notifier_call_chain(&inetaddr_chain, 357 NETDEV_DOWN, ifa); 358 inet_free_ifa(ifa); 359 } else { 360 promote = ifa; 361 break; 362 } 363 } 364 } 365 366 /* On promotion all secondaries from subnet are changing 367 * the primary IP, we must remove all their routes silently 368 * and later to add them back with new prefsrc. Do this 369 * while all addresses are on the device list. 370 */ 371 for (ifa = promote; ifa; ifa = ifa->ifa_next) { 372 if (ifa1->ifa_mask == ifa->ifa_mask && 373 inet_ifa_match(ifa1->ifa_address, ifa)) 374 fib_del_ifaddr(ifa, ifa1); 375 } 376 377 /* 2. Unlink it */ 378 379 *ifap = ifa1->ifa_next; 380 inet_hash_remove(ifa1); 381 382 /* 3. Announce address deletion */ 383 384 /* Send message first, then call notifier. 385 At first sight, FIB update triggered by notifier 386 will refer to already deleted ifaddr, that could confuse 387 netlink listeners. It is not true: look, gated sees 388 that route deleted and if it still thinks that ifaddr 389 is valid, it will try to restore deleted routes... Grr. 390 So that, this order is correct. 391 */ 392 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid); 393 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); 394 395 if (promote) { 396 struct in_ifaddr *next_sec = promote->ifa_next; 397 398 if (prev_prom) { 399 prev_prom->ifa_next = promote->ifa_next; 400 promote->ifa_next = last_prim->ifa_next; 401 last_prim->ifa_next = promote; 402 } 403 404 promote->ifa_flags &= ~IFA_F_SECONDARY; 405 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid); 406 blocking_notifier_call_chain(&inetaddr_chain, 407 NETDEV_UP, promote); 408 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) { 409 if (ifa1->ifa_mask != ifa->ifa_mask || 410 !inet_ifa_match(ifa1->ifa_address, ifa)) 411 continue; 412 fib_add_ifaddr(ifa); 413 } 414 415 } 416 if (destroy) 417 inet_free_ifa(ifa1); 418} 419 420static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 421 int destroy) 422{ 423 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); 424} 425 426static void check_lifetime(struct work_struct *work); 427 428static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime); 429 430static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, 431 u32 portid) 432{ 433 struct in_device *in_dev = ifa->ifa_dev; 434 struct in_ifaddr *ifa1, **ifap, **last_primary; 435 436 ASSERT_RTNL(); 437 438 if (!ifa->ifa_local) { 439 inet_free_ifa(ifa); 440 return 0; 441 } 442 443 ifa->ifa_flags &= ~IFA_F_SECONDARY; 444 last_primary = &in_dev->ifa_list; 445 446 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 447 ifap = &ifa1->ifa_next) { 448 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && 449 ifa->ifa_scope <= ifa1->ifa_scope) 450 last_primary = &ifa1->ifa_next; 451 if (ifa1->ifa_mask == ifa->ifa_mask && 452 inet_ifa_match(ifa1->ifa_address, ifa)) { 453 if (ifa1->ifa_local == ifa->ifa_local) { 454 inet_free_ifa(ifa); 455 return -EEXIST; 456 } 457 if (ifa1->ifa_scope != ifa->ifa_scope) { 458 inet_free_ifa(ifa); 459 return -EINVAL; 460 } 461 ifa->ifa_flags |= IFA_F_SECONDARY; 462 } 463 } 464 465 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { 466 net_srandom(ifa->ifa_local); 467 ifap = last_primary; 468 } 469 470 ifa->ifa_next = *ifap; 471 *ifap = ifa; 472 473 inet_hash_insert(dev_net(in_dev->dev), ifa); 474 475 cancel_delayed_work(&check_lifetime_work); 476 schedule_delayed_work(&check_lifetime_work, 0); 477 478 /* Send message first, then call notifier. 479 Notifier will trigger FIB update, so that 480 listeners of netlink will know about new ifaddr */ 481 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid); 482 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 483 484 return 0; 485} 486 487static int inet_insert_ifa(struct in_ifaddr *ifa) 488{ 489 return __inet_insert_ifa(ifa, NULL, 0); 490} 491 492static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) 493{ 494 struct in_device *in_dev = __in_dev_get_rtnl(dev); 495 496 ASSERT_RTNL(); 497 498 if (!in_dev) { 499 inet_free_ifa(ifa); 500 return -ENOBUFS; 501 } 502 ipv4_devconf_setall(in_dev); 503 if (ifa->ifa_dev != in_dev) { 504 WARN_ON(ifa->ifa_dev); 505 in_dev_hold(in_dev); 506 ifa->ifa_dev = in_dev; 507 } 508 if (ipv4_is_loopback(ifa->ifa_local)) 509 ifa->ifa_scope = RT_SCOPE_HOST; 510 return inet_insert_ifa(ifa); 511} 512 513/* Caller must hold RCU or RTNL : 514 * We dont take a reference on found in_device 515 */ 516struct in_device *inetdev_by_index(struct net *net, int ifindex) 517{ 518 struct net_device *dev; 519 struct in_device *in_dev = NULL; 520 521 rcu_read_lock(); 522 dev = dev_get_by_index_rcu(net, ifindex); 523 if (dev) 524 in_dev = rcu_dereference_rtnl(dev->ip_ptr); 525 rcu_read_unlock(); 526 return in_dev; 527} 528EXPORT_SYMBOL(inetdev_by_index); 529 530/* Called only from RTNL semaphored context. No locks. */ 531 532struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, 533 __be32 mask) 534{ 535 ASSERT_RTNL(); 536 537 for_primary_ifa(in_dev) { 538 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) 539 return ifa; 540 } endfor_ifa(in_dev); 541 return NULL; 542} 543 544static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 545{ 546 struct net *net = sock_net(skb->sk); 547 struct nlattr *tb[IFA_MAX+1]; 548 struct in_device *in_dev; 549 struct ifaddrmsg *ifm; 550 struct in_ifaddr *ifa, **ifap; 551 int err = -EINVAL; 552 553 ASSERT_RTNL(); 554 555 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 556 if (err < 0) 557 goto errout; 558 559 ifm = nlmsg_data(nlh); 560 in_dev = inetdev_by_index(net, ifm->ifa_index); 561 if (in_dev == NULL) { 562 err = -ENODEV; 563 goto errout; 564 } 565 566 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 567 ifap = &ifa->ifa_next) { 568 if (tb[IFA_LOCAL] && 569 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) 570 continue; 571 572 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) 573 continue; 574 575 if (tb[IFA_ADDRESS] && 576 (ifm->ifa_prefixlen != ifa->ifa_prefixlen || 577 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) 578 continue; 579 580 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); 581 return 0; 582 } 583 584 err = -EADDRNOTAVAIL; 585errout: 586 return err; 587} 588 589#define INFINITY_LIFE_TIME 0xFFFFFFFF 590 591static void check_lifetime(struct work_struct *work) 592{ 593 unsigned long now, next, next_sec, next_sched; 594 struct in_ifaddr *ifa; 595 struct hlist_node *n; 596 int i; 597 598 now = jiffies; 599 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 600 601 for (i = 0; i < IN4_ADDR_HSIZE; i++) { 602 bool change_needed = false; 603 604 rcu_read_lock(); 605 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) { 606 unsigned long age; 607 608 if (ifa->ifa_flags & IFA_F_PERMANENT) 609 continue; 610 611 /* We try to batch several events at once. */ 612 age = (now - ifa->ifa_tstamp + 613 ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 614 615 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && 616 age >= ifa->ifa_valid_lft) { 617 change_needed = true; 618 } else if (ifa->ifa_preferred_lft == 619 INFINITY_LIFE_TIME) { 620 continue; 621 } else if (age >= ifa->ifa_preferred_lft) { 622 if (time_before(ifa->ifa_tstamp + 623 ifa->ifa_valid_lft * HZ, next)) 624 next = ifa->ifa_tstamp + 625 ifa->ifa_valid_lft * HZ; 626 627 if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) 628 change_needed = true; 629 } else if (time_before(ifa->ifa_tstamp + 630 ifa->ifa_preferred_lft * HZ, 631 next)) { 632 next = ifa->ifa_tstamp + 633 ifa->ifa_preferred_lft * HZ; 634 } 635 } 636 rcu_read_unlock(); 637 if (!change_needed) 638 continue; 639 rtnl_lock(); 640 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) { 641 unsigned long age; 642 643 if (ifa->ifa_flags & IFA_F_PERMANENT) 644 continue; 645 646 /* We try to batch several events at once. */ 647 age = (now - ifa->ifa_tstamp + 648 ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 649 650 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && 651 age >= ifa->ifa_valid_lft) { 652 struct in_ifaddr **ifap; 653 654 for (ifap = &ifa->ifa_dev->ifa_list; 655 *ifap != NULL; ifap = &(*ifap)->ifa_next) { 656 if (*ifap == ifa) { 657 inet_del_ifa(ifa->ifa_dev, 658 ifap, 1); 659 break; 660 } 661 } 662 } else if (ifa->ifa_preferred_lft != 663 INFINITY_LIFE_TIME && 664 age >= ifa->ifa_preferred_lft && 665 !(ifa->ifa_flags & IFA_F_DEPRECATED)) { 666 ifa->ifa_flags |= IFA_F_DEPRECATED; 667 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 668 } 669 } 670 rtnl_unlock(); 671 } 672 673 next_sec = round_jiffies_up(next); 674 next_sched = next; 675 676 /* If rounded timeout is accurate enough, accept it. */ 677 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 678 next_sched = next_sec; 679 680 now = jiffies; 681 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 682 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX)) 683 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX; 684 685 schedule_delayed_work(&check_lifetime_work, next_sched - now); 686} 687 688static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, 689 __u32 prefered_lft) 690{ 691 unsigned long timeout; 692 693 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); 694 695 timeout = addrconf_timeout_fixup(valid_lft, HZ); 696 if (addrconf_finite_timeout(timeout)) 697 ifa->ifa_valid_lft = timeout; 698 else 699 ifa->ifa_flags |= IFA_F_PERMANENT; 700 701 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 702 if (addrconf_finite_timeout(timeout)) { 703 if (timeout == 0) 704 ifa->ifa_flags |= IFA_F_DEPRECATED; 705 ifa->ifa_preferred_lft = timeout; 706 } 707 ifa->ifa_tstamp = jiffies; 708 if (!ifa->ifa_cstamp) 709 ifa->ifa_cstamp = ifa->ifa_tstamp; 710} 711 712static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, 713 __u32 *pvalid_lft, __u32 *pprefered_lft) 714{ 715 struct nlattr *tb[IFA_MAX+1]; 716 struct in_ifaddr *ifa; 717 struct ifaddrmsg *ifm; 718 struct net_device *dev; 719 struct in_device *in_dev; 720 int err; 721 722 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 723 if (err < 0) 724 goto errout; 725 726 ifm = nlmsg_data(nlh); 727 err = -EINVAL; 728 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) 729 goto errout; 730 731 dev = __dev_get_by_index(net, ifm->ifa_index); 732 err = -ENODEV; 733 if (dev == NULL) 734 goto errout; 735 736 in_dev = __in_dev_get_rtnl(dev); 737 err = -ENOBUFS; 738 if (in_dev == NULL) 739 goto errout; 740 741 ifa = inet_alloc_ifa(); 742 if (ifa == NULL) 743 /* 744 * A potential indev allocation can be left alive, it stays 745 * assigned to its device and is destroy with it. 746 */ 747 goto errout; 748 749 ipv4_devconf_setall(in_dev); 750 in_dev_hold(in_dev); 751 752 if (tb[IFA_ADDRESS] == NULL) 753 tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 754 755 INIT_HLIST_NODE(&ifa->hash); 756 ifa->ifa_prefixlen = ifm->ifa_prefixlen; 757 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 758 ifa->ifa_flags = ifm->ifa_flags; 759 ifa->ifa_scope = ifm->ifa_scope; 760 ifa->ifa_dev = in_dev; 761 762 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); 763 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); 764 765 if (tb[IFA_BROADCAST]) 766 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); 767 768 if (tb[IFA_LABEL]) 769 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 770 else 771 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 772 773 if (tb[IFA_CACHEINFO]) { 774 struct ifa_cacheinfo *ci; 775 776 ci = nla_data(tb[IFA_CACHEINFO]); 777 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { 778 err = -EINVAL; 779 goto errout_free; 780 } 781 *pvalid_lft = ci->ifa_valid; 782 *pprefered_lft = ci->ifa_prefered; 783 } 784 785 return ifa; 786 787errout_free: 788 inet_free_ifa(ifa); 789errout: 790 return ERR_PTR(err); 791} 792 793static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) 794{ 795 struct in_device *in_dev = ifa->ifa_dev; 796 struct in_ifaddr *ifa1, **ifap; 797 798 if (!ifa->ifa_local) 799 return NULL; 800 801 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 802 ifap = &ifa1->ifa_next) { 803 if (ifa1->ifa_mask == ifa->ifa_mask && 804 inet_ifa_match(ifa1->ifa_address, ifa) && 805 ifa1->ifa_local == ifa->ifa_local) 806 return ifa1; 807 } 808 return NULL; 809} 810 811static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 812{ 813 struct net *net = sock_net(skb->sk); 814 struct in_ifaddr *ifa; 815 struct in_ifaddr *ifa_existing; 816 __u32 valid_lft = INFINITY_LIFE_TIME; 817 __u32 prefered_lft = INFINITY_LIFE_TIME; 818 819 ASSERT_RTNL(); 820 821 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft); 822 if (IS_ERR(ifa)) 823 return PTR_ERR(ifa); 824 825 ifa_existing = find_matching_ifa(ifa); 826 if (!ifa_existing) { 827 /* It would be best to check for !NLM_F_CREATE here but 828 * userspace alreay relies on not having to provide this. 829 */ 830 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 831 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid); 832 } else { 833 inet_free_ifa(ifa); 834 835 if (nlh->nlmsg_flags & NLM_F_EXCL || 836 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 837 return -EEXIST; 838 ifa = ifa_existing; 839 set_ifa_lifetime(ifa, valid_lft, prefered_lft); 840 cancel_delayed_work(&check_lifetime_work); 841 schedule_delayed_work(&check_lifetime_work, 0); 842 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); 843 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 844 } 845 return 0; 846} 847 848/* 849 * Determine a default network mask, based on the IP address. 850 */ 851 852static int inet_abc_len(__be32 addr) 853{ 854 int rc = -1; /* Something else, probably a multicast. */ 855 856 if (ipv4_is_zeronet(addr)) 857 rc = 0; 858 else { 859 __u32 haddr = ntohl(addr); 860 861 if (IN_CLASSA(haddr)) 862 rc = 8; 863 else if (IN_CLASSB(haddr)) 864 rc = 16; 865 else if (IN_CLASSC(haddr)) 866 rc = 24; 867 } 868 869 return rc; 870} 871 872 873int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) 874{ 875 struct ifreq ifr; 876 struct sockaddr_in sin_orig; 877 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; 878 struct in_device *in_dev; 879 struct in_ifaddr **ifap = NULL; 880 struct in_ifaddr *ifa = NULL; 881 struct net_device *dev; 882 char *colon; 883 int ret = -EFAULT; 884 int tryaddrmatch = 0; 885 886 /* 887 * Fetch the caller's info block into kernel space 888 */ 889 890 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 891 goto out; 892 ifr.ifr_name[IFNAMSIZ - 1] = 0; 893 894 /* save original address for comparison */ 895 memcpy(&sin_orig, sin, sizeof(*sin)); 896 897 colon = strchr(ifr.ifr_name, ':'); 898 if (colon) 899 *colon = 0; 900 901 dev_load(net, ifr.ifr_name); 902 903 switch (cmd) { 904 case SIOCGIFADDR: /* Get interface address */ 905 case SIOCGIFBRDADDR: /* Get the broadcast address */ 906 case SIOCGIFDSTADDR: /* Get the destination address */ 907 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 908 /* Note that these ioctls will not sleep, 909 so that we do not impose a lock. 910 One day we will be forced to put shlock here (I mean SMP) 911 */ 912 tryaddrmatch = (sin_orig.sin_family == AF_INET); 913 memset(sin, 0, sizeof(*sin)); 914 sin->sin_family = AF_INET; 915 break; 916 917 case SIOCSIFFLAGS: 918 ret = -EPERM; 919 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 920 goto out; 921 break; 922 case SIOCSIFADDR: /* Set interface address (and family) */ 923 case SIOCSIFBRDADDR: /* Set the broadcast address */ 924 case SIOCSIFDSTADDR: /* Set the destination address */ 925 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 926 ret = -EPERM; 927 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 928 goto out; 929 ret = -EINVAL; 930 if (sin->sin_family != AF_INET) 931 goto out; 932 break; 933 default: 934 ret = -EINVAL; 935 goto out; 936 } 937 938 rtnl_lock(); 939 940 ret = -ENODEV; 941 dev = __dev_get_by_name(net, ifr.ifr_name); 942 if (!dev) 943 goto done; 944 945 if (colon) 946 *colon = ':'; 947 948 in_dev = __in_dev_get_rtnl(dev); 949 if (in_dev) { 950 if (tryaddrmatch) { 951 /* Matthias Andree */ 952 /* compare label and address (4.4BSD style) */ 953 /* note: we only do this for a limited set of ioctls 954 and only if the original address family was AF_INET. 955 This is checked above. */ 956 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 957 ifap = &ifa->ifa_next) { 958 if (!strcmp(ifr.ifr_name, ifa->ifa_label) && 959 sin_orig.sin_addr.s_addr == 960 ifa->ifa_local) { 961 break; /* found */ 962 } 963 } 964 } 965 /* we didn't get a match, maybe the application is 966 4.3BSD-style and passed in junk so we fall back to 967 comparing just the label */ 968 if (!ifa) { 969 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 970 ifap = &ifa->ifa_next) 971 if (!strcmp(ifr.ifr_name, ifa->ifa_label)) 972 break; 973 } 974 } 975 976 ret = -EADDRNOTAVAIL; 977 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 978 goto done; 979 980 switch (cmd) { 981 case SIOCGIFADDR: /* Get interface address */ 982 sin->sin_addr.s_addr = ifa->ifa_local; 983 goto rarok; 984 985 case SIOCGIFBRDADDR: /* Get the broadcast address */ 986 sin->sin_addr.s_addr = ifa->ifa_broadcast; 987 goto rarok; 988 989 case SIOCGIFDSTADDR: /* Get the destination address */ 990 sin->sin_addr.s_addr = ifa->ifa_address; 991 goto rarok; 992 993 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 994 sin->sin_addr.s_addr = ifa->ifa_mask; 995 goto rarok; 996 997 case SIOCSIFFLAGS: 998 if (colon) { 999 ret = -EADDRNOTAVAIL; 1000 if (!ifa) 1001 break; 1002 ret = 0; 1003 if (!(ifr.ifr_flags & IFF_UP)) 1004 inet_del_ifa(in_dev, ifap, 1); 1005 break; 1006 } 1007 ret = dev_change_flags(dev, ifr.ifr_flags); 1008 break; 1009 1010 case SIOCSIFADDR: /* Set interface address (and family) */ 1011 ret = -EINVAL; 1012 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1013 break; 1014 1015 if (!ifa) { 1016 ret = -ENOBUFS; 1017 ifa = inet_alloc_ifa(); 1018 if (!ifa) 1019 break; 1020 INIT_HLIST_NODE(&ifa->hash); 1021 if (colon) 1022 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); 1023 else 1024 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1025 } else { 1026 ret = 0; 1027 if (ifa->ifa_local == sin->sin_addr.s_addr) 1028 break; 1029 inet_del_ifa(in_dev, ifap, 0); 1030 ifa->ifa_broadcast = 0; 1031 ifa->ifa_scope = 0; 1032 } 1033 1034 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 1035 1036 if (!(dev->flags & IFF_POINTOPOINT)) { 1037 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 1038 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 1039 if ((dev->flags & IFF_BROADCAST) && 1040 ifa->ifa_prefixlen < 31) 1041 ifa->ifa_broadcast = ifa->ifa_address | 1042 ~ifa->ifa_mask; 1043 } else { 1044 ifa->ifa_prefixlen = 32; 1045 ifa->ifa_mask = inet_make_mask(32); 1046 } 1047 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 1048 ret = inet_set_ifa(dev, ifa); 1049 break; 1050 1051 case SIOCSIFBRDADDR: /* Set the broadcast address */ 1052 ret = 0; 1053 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 1054 inet_del_ifa(in_dev, ifap, 0); 1055 ifa->ifa_broadcast = sin->sin_addr.s_addr; 1056 inet_insert_ifa(ifa); 1057 } 1058 break; 1059 1060 case SIOCSIFDSTADDR: /* Set the destination address */ 1061 ret = 0; 1062 if (ifa->ifa_address == sin->sin_addr.s_addr) 1063 break; 1064 ret = -EINVAL; 1065 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 1066 break; 1067 ret = 0; 1068 inet_del_ifa(in_dev, ifap, 0); 1069 ifa->ifa_address = sin->sin_addr.s_addr; 1070 inet_insert_ifa(ifa); 1071 break; 1072 1073 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 1074 1075 /* 1076 * The mask we set must be legal. 1077 */ 1078 ret = -EINVAL; 1079 if (bad_mask(sin->sin_addr.s_addr, 0)) 1080 break; 1081 ret = 0; 1082 if (ifa->ifa_mask != sin->sin_addr.s_addr) { 1083 __be32 old_mask = ifa->ifa_mask; 1084 inet_del_ifa(in_dev, ifap, 0); 1085 ifa->ifa_mask = sin->sin_addr.s_addr; 1086 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 1087 1088 /* See if current broadcast address matches 1089 * with current netmask, then recalculate 1090 * the broadcast address. Otherwise it's a 1091 * funny address, so don't touch it since 1092 * the user seems to know what (s)he's doing... 1093 */ 1094 if ((dev->flags & IFF_BROADCAST) && 1095 (ifa->ifa_prefixlen < 31) && 1096 (ifa->ifa_broadcast == 1097 (ifa->ifa_local|~old_mask))) { 1098 ifa->ifa_broadcast = (ifa->ifa_local | 1099 ~sin->sin_addr.s_addr); 1100 } 1101 inet_insert_ifa(ifa); 1102 } 1103 break; 1104 } 1105done: 1106 rtnl_unlock(); 1107out: 1108 return ret; 1109rarok: 1110 rtnl_unlock(); 1111 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; 1112 goto out; 1113} 1114 1115static int inet_gifconf(struct net_device *dev, char __user *buf, int len) 1116{ 1117 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1118 struct in_ifaddr *ifa; 1119 struct ifreq ifr; 1120 int done = 0; 1121 1122 if (!in_dev) 1123 goto out; 1124 1125 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1126 if (!buf) { 1127 done += sizeof(ifr); 1128 continue; 1129 } 1130 if (len < (int) sizeof(ifr)) 1131 break; 1132 memset(&ifr, 0, sizeof(struct ifreq)); 1133 strcpy(ifr.ifr_name, ifa->ifa_label); 1134 1135 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 1136 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 1137 ifa->ifa_local; 1138 1139 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { 1140 done = -EFAULT; 1141 break; 1142 } 1143 buf += sizeof(struct ifreq); 1144 len -= sizeof(struct ifreq); 1145 done += sizeof(struct ifreq); 1146 } 1147out: 1148 return done; 1149} 1150 1151__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 1152{ 1153 __be32 addr = 0; 1154 struct in_device *in_dev; 1155 struct net *net = dev_net(dev); 1156 1157 rcu_read_lock(); 1158 in_dev = __in_dev_get_rcu(dev); 1159 if (!in_dev) 1160 goto no_in_dev; 1161 1162 for_primary_ifa(in_dev) { 1163 if (ifa->ifa_scope > scope) 1164 continue; 1165 if (!dst || inet_ifa_match(dst, ifa)) { 1166 addr = ifa->ifa_local; 1167 break; 1168 } 1169 if (!addr) 1170 addr = ifa->ifa_local; 1171 } endfor_ifa(in_dev); 1172 1173 if (addr) 1174 goto out_unlock; 1175no_in_dev: 1176 1177 /* Not loopback addresses on loopback should be preferred 1178 in this case. It is importnat that lo is the first interface 1179 in dev_base list. 1180 */ 1181 for_each_netdev_rcu(net, dev) { 1182 in_dev = __in_dev_get_rcu(dev); 1183 if (!in_dev) 1184 continue; 1185 1186 for_primary_ifa(in_dev) { 1187 if (ifa->ifa_scope != RT_SCOPE_LINK && 1188 ifa->ifa_scope <= scope) { 1189 addr = ifa->ifa_local; 1190 goto out_unlock; 1191 } 1192 } endfor_ifa(in_dev); 1193 } 1194out_unlock: 1195 rcu_read_unlock(); 1196 return addr; 1197} 1198EXPORT_SYMBOL(inet_select_addr); 1199 1200static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 1201 __be32 local, int scope) 1202{ 1203 int same = 0; 1204 __be32 addr = 0; 1205 1206 for_ifa(in_dev) { 1207 if (!addr && 1208 (local == ifa->ifa_local || !local) && 1209 ifa->ifa_scope <= scope) { 1210 addr = ifa->ifa_local; 1211 if (same) 1212 break; 1213 } 1214 if (!same) { 1215 same = (!local || inet_ifa_match(local, ifa)) && 1216 (!dst || inet_ifa_match(dst, ifa)); 1217 if (same && addr) { 1218 if (local || !dst) 1219 break; 1220 /* Is the selected addr into dst subnet? */ 1221 if (inet_ifa_match(addr, ifa)) 1222 break; 1223 /* No, then can we use new local src? */ 1224 if (ifa->ifa_scope <= scope) { 1225 addr = ifa->ifa_local; 1226 break; 1227 } 1228 /* search for large dst subnet for addr */ 1229 same = 0; 1230 } 1231 } 1232 } endfor_ifa(in_dev); 1233 1234 return same ? addr : 0; 1235} 1236 1237/* 1238 * Confirm that local IP address exists using wildcards: 1239 * - in_dev: only on this interface, 0=any interface 1240 * - dst: only in the same subnet as dst, 0=any dst 1241 * - local: address, 0=autoselect the local address 1242 * - scope: maximum allowed scope value for the local address 1243 */ 1244__be32 inet_confirm_addr(struct in_device *in_dev, 1245 __be32 dst, __be32 local, int scope) 1246{ 1247 __be32 addr = 0; 1248 struct net_device *dev; 1249 struct net *net; 1250 1251 if (scope != RT_SCOPE_LINK) 1252 return confirm_addr_indev(in_dev, dst, local, scope); 1253 1254 net = dev_net(in_dev->dev); 1255 rcu_read_lock(); 1256 for_each_netdev_rcu(net, dev) { 1257 in_dev = __in_dev_get_rcu(dev); 1258 if (in_dev) { 1259 addr = confirm_addr_indev(in_dev, dst, local, scope); 1260 if (addr) 1261 break; 1262 } 1263 } 1264 rcu_read_unlock(); 1265 1266 return addr; 1267} 1268EXPORT_SYMBOL(inet_confirm_addr); 1269 1270/* 1271 * Device notifier 1272 */ 1273 1274int register_inetaddr_notifier(struct notifier_block *nb) 1275{ 1276 return blocking_notifier_chain_register(&inetaddr_chain, nb); 1277} 1278EXPORT_SYMBOL(register_inetaddr_notifier); 1279 1280int unregister_inetaddr_notifier(struct notifier_block *nb) 1281{ 1282 return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 1283} 1284EXPORT_SYMBOL(unregister_inetaddr_notifier); 1285 1286/* Rename ifa_labels for a device name change. Make some effort to preserve 1287 * existing alias numbering and to create unique labels if possible. 1288*/ 1289static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 1290{ 1291 struct in_ifaddr *ifa; 1292 int named = 0; 1293 1294 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1295 char old[IFNAMSIZ], *dot; 1296 1297 memcpy(old, ifa->ifa_label, IFNAMSIZ); 1298 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1299 if (named++ == 0) 1300 goto skip; 1301 dot = strchr(old, ':'); 1302 if (dot == NULL) { 1303 sprintf(old, ":%d", named); 1304 dot = old; 1305 } 1306 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) 1307 strcat(ifa->ifa_label, dot); 1308 else 1309 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 1310skip: 1311 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 1312 } 1313} 1314 1315static bool inetdev_valid_mtu(unsigned int mtu) 1316{ 1317 return mtu >= 68; 1318} 1319 1320static void inetdev_send_gratuitous_arp(struct net_device *dev, 1321 struct in_device *in_dev) 1322 1323{ 1324 struct in_ifaddr *ifa; 1325 1326 for (ifa = in_dev->ifa_list; ifa; 1327 ifa = ifa->ifa_next) { 1328 arp_send(ARPOP_REQUEST, ETH_P_ARP, 1329 ifa->ifa_local, dev, 1330 ifa->ifa_local, NULL, 1331 dev->dev_addr, NULL); 1332 } 1333} 1334 1335/* Called only under RTNL semaphore */ 1336 1337static int inetdev_event(struct notifier_block *this, unsigned long event, 1338 void *ptr) 1339{ 1340 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1341 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1342 1343 ASSERT_RTNL(); 1344 1345 if (!in_dev) { 1346 if (event == NETDEV_REGISTER) { 1347 in_dev = inetdev_init(dev); 1348 if (!in_dev) 1349 return notifier_from_errno(-ENOMEM); 1350 if (dev->flags & IFF_LOOPBACK) { 1351 IN_DEV_CONF_SET(in_dev, NOXFRM, 1); 1352 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); 1353 } 1354 } else if (event == NETDEV_CHANGEMTU) { 1355 /* Re-enabling IP */ 1356 if (inetdev_valid_mtu(dev->mtu)) 1357 in_dev = inetdev_init(dev); 1358 } 1359 goto out; 1360 } 1361 1362 switch (event) { 1363 case NETDEV_REGISTER: 1364 pr_debug("%s: bug\n", __func__); 1365 RCU_INIT_POINTER(dev->ip_ptr, NULL); 1366 break; 1367 case NETDEV_UP: 1368 if (!inetdev_valid_mtu(dev->mtu)) 1369 break; 1370 if (dev->flags & IFF_LOOPBACK) { 1371 struct in_ifaddr *ifa = inet_alloc_ifa(); 1372 1373 if (ifa) { 1374 INIT_HLIST_NODE(&ifa->hash); 1375 ifa->ifa_local = 1376 ifa->ifa_address = htonl(INADDR_LOOPBACK); 1377 ifa->ifa_prefixlen = 8; 1378 ifa->ifa_mask = inet_make_mask(8); 1379 in_dev_hold(in_dev); 1380 ifa->ifa_dev = in_dev; 1381 ifa->ifa_scope = RT_SCOPE_HOST; 1382 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1383 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, 1384 INFINITY_LIFE_TIME); 1385 inet_insert_ifa(ifa); 1386 } 1387 } 1388 ip_mc_up(in_dev); 1389 /* fall through */ 1390 case NETDEV_CHANGEADDR: 1391 if (!IN_DEV_ARP_NOTIFY(in_dev)) 1392 break; 1393 /* fall through */ 1394 case NETDEV_NOTIFY_PEERS: 1395 /* Send gratuitous ARP to notify of link change */ 1396 inetdev_send_gratuitous_arp(dev, in_dev); 1397 break; 1398 case NETDEV_DOWN: 1399 ip_mc_down(in_dev); 1400 break; 1401 case NETDEV_PRE_TYPE_CHANGE: 1402 ip_mc_unmap(in_dev); 1403 break; 1404 case NETDEV_POST_TYPE_CHANGE: 1405 ip_mc_remap(in_dev); 1406 break; 1407 case NETDEV_CHANGEMTU: 1408 if (inetdev_valid_mtu(dev->mtu)) 1409 break; 1410 /* disable IP when MTU is not enough */ 1411 case NETDEV_UNREGISTER: 1412 inetdev_destroy(in_dev); 1413 break; 1414 case NETDEV_CHANGENAME: 1415 /* Do not notify about label change, this event is 1416 * not interesting to applications using netlink. 1417 */ 1418 inetdev_changename(dev, in_dev); 1419 1420 devinet_sysctl_unregister(in_dev); 1421 devinet_sysctl_register(in_dev); 1422 break; 1423 } 1424out: 1425 return NOTIFY_DONE; 1426} 1427 1428static struct notifier_block ip_netdev_notifier = { 1429 .notifier_call = inetdev_event, 1430}; 1431 1432static size_t inet_nlmsg_size(void) 1433{ 1434 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1435 + nla_total_size(4) /* IFA_ADDRESS */ 1436 + nla_total_size(4) /* IFA_LOCAL */ 1437 + nla_total_size(4) /* IFA_BROADCAST */ 1438 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ 1439} 1440 1441static inline u32 cstamp_delta(unsigned long cstamp) 1442{ 1443 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 1444} 1445 1446static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 1447 unsigned long tstamp, u32 preferred, u32 valid) 1448{ 1449 struct ifa_cacheinfo ci; 1450 1451 ci.cstamp = cstamp_delta(cstamp); 1452 ci.tstamp = cstamp_delta(tstamp); 1453 ci.ifa_prefered = preferred; 1454 ci.ifa_valid = valid; 1455 1456 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 1457} 1458 1459static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1460 u32 portid, u32 seq, int event, unsigned int flags) 1461{ 1462 struct ifaddrmsg *ifm; 1463 struct nlmsghdr *nlh; 1464 u32 preferred, valid; 1465 1466 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); 1467 if (nlh == NULL) 1468 return -EMSGSIZE; 1469 1470 ifm = nlmsg_data(nlh); 1471 ifm->ifa_family = AF_INET; 1472 ifm->ifa_prefixlen = ifa->ifa_prefixlen; 1473 ifm->ifa_flags = ifa->ifa_flags; 1474 ifm->ifa_scope = ifa->ifa_scope; 1475 ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 1476 1477 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { 1478 preferred = ifa->ifa_preferred_lft; 1479 valid = ifa->ifa_valid_lft; 1480 if (preferred != INFINITY_LIFE_TIME) { 1481 long tval = (jiffies - ifa->ifa_tstamp) / HZ; 1482 1483 if (preferred > tval) 1484 preferred -= tval; 1485 else 1486 preferred = 0; 1487 if (valid != INFINITY_LIFE_TIME) { 1488 if (valid > tval) 1489 valid -= tval; 1490 else 1491 valid = 0; 1492 } 1493 } 1494 } else { 1495 preferred = INFINITY_LIFE_TIME; 1496 valid = INFINITY_LIFE_TIME; 1497 } 1498 if ((ifa->ifa_address && 1499 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) || 1500 (ifa->ifa_local && 1501 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) || 1502 (ifa->ifa_broadcast && 1503 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || 1504 (ifa->ifa_label[0] && 1505 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || 1506 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, 1507 preferred, valid)) 1508 goto nla_put_failure; 1509 1510 return nlmsg_end(skb, nlh); 1511 1512nla_put_failure: 1513 nlmsg_cancel(skb, nlh); 1514 return -EMSGSIZE; 1515} 1516 1517static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1518{ 1519 struct net *net = sock_net(skb->sk); 1520 int h, s_h; 1521 int idx, s_idx; 1522 int ip_idx, s_ip_idx; 1523 struct net_device *dev; 1524 struct in_device *in_dev; 1525 struct in_ifaddr *ifa; 1526 struct hlist_head *head; 1527 1528 s_h = cb->args[0]; 1529 s_idx = idx = cb->args[1]; 1530 s_ip_idx = ip_idx = cb->args[2]; 1531 1532 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1533 idx = 0; 1534 head = &net->dev_index_head[h]; 1535 rcu_read_lock(); 1536 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1537 net->dev_base_seq; 1538 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1539 if (idx < s_idx) 1540 goto cont; 1541 if (h > s_h || idx > s_idx) 1542 s_ip_idx = 0; 1543 in_dev = __in_dev_get_rcu(dev); 1544 if (!in_dev) 1545 goto cont; 1546 1547 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 1548 ifa = ifa->ifa_next, ip_idx++) { 1549 if (ip_idx < s_ip_idx) 1550 continue; 1551 if (inet_fill_ifaddr(skb, ifa, 1552 NETLINK_CB(cb->skb).portid, 1553 cb->nlh->nlmsg_seq, 1554 RTM_NEWADDR, NLM_F_MULTI) <= 0) { 1555 rcu_read_unlock(); 1556 goto done; 1557 } 1558 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1559 } 1560cont: 1561 idx++; 1562 } 1563 rcu_read_unlock(); 1564 } 1565 1566done: 1567 cb->args[0] = h; 1568 cb->args[1] = idx; 1569 cb->args[2] = ip_idx; 1570 1571 return skb->len; 1572} 1573 1574static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, 1575 u32 portid) 1576{ 1577 struct sk_buff *skb; 1578 u32 seq = nlh ? nlh->nlmsg_seq : 0; 1579 int err = -ENOBUFS; 1580 struct net *net; 1581 1582 net = dev_net(ifa->ifa_dev->dev); 1583 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1584 if (skb == NULL) 1585 goto errout; 1586 1587 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0); 1588 if (err < 0) { 1589 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1590 WARN_ON(err == -EMSGSIZE); 1591 kfree_skb(skb); 1592 goto errout; 1593 } 1594 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1595 return; 1596errout: 1597 if (err < 0) 1598 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); 1599} 1600 1601static size_t inet_get_link_af_size(const struct net_device *dev) 1602{ 1603 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1604 1605 if (!in_dev) 1606 return 0; 1607 1608 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ 1609} 1610 1611static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 1612{ 1613 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1614 struct nlattr *nla; 1615 int i; 1616 1617 if (!in_dev) 1618 return -ENODATA; 1619 1620 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); 1621 if (nla == NULL) 1622 return -EMSGSIZE; 1623 1624 for (i = 0; i < IPV4_DEVCONF_MAX; i++) 1625 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; 1626 1627 return 0; 1628} 1629 1630static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { 1631 [IFLA_INET_CONF] = { .type = NLA_NESTED }, 1632}; 1633 1634static int inet_validate_link_af(const struct net_device *dev, 1635 const struct nlattr *nla) 1636{ 1637 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1638 int err, rem; 1639 1640 if (dev && !__in_dev_get_rtnl(dev)) 1641 return -EAFNOSUPPORT; 1642 1643 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); 1644 if (err < 0) 1645 return err; 1646 1647 if (tb[IFLA_INET_CONF]) { 1648 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { 1649 int cfgid = nla_type(a); 1650 1651 if (nla_len(a) < 4) 1652 return -EINVAL; 1653 1654 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) 1655 return -EINVAL; 1656 } 1657 } 1658 1659 return 0; 1660} 1661 1662static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) 1663{ 1664 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1665 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1666 int rem; 1667 1668 if (!in_dev) 1669 return -EAFNOSUPPORT; 1670 1671 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) 1672 BUG(); 1673 1674 if (tb[IFLA_INET_CONF]) { 1675 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) 1676 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); 1677 } 1678 1679 return 0; 1680} 1681 1682static int inet_netconf_msgsize_devconf(int type) 1683{ 1684 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1685 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1686 1687 /* type -1 is used for ALL */ 1688 if (type == -1 || type == NETCONFA_FORWARDING) 1689 size += nla_total_size(4); 1690 if (type == -1 || type == NETCONFA_RP_FILTER) 1691 size += nla_total_size(4); 1692 if (type == -1 || type == NETCONFA_MC_FORWARDING) 1693 size += nla_total_size(4); 1694 1695 return size; 1696} 1697 1698static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 1699 struct ipv4_devconf *devconf, u32 portid, 1700 u32 seq, int event, unsigned int flags, 1701 int type) 1702{ 1703 struct nlmsghdr *nlh; 1704 struct netconfmsg *ncm; 1705 1706 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1707 flags); 1708 if (nlh == NULL) 1709 return -EMSGSIZE; 1710 1711 ncm = nlmsg_data(nlh); 1712 ncm->ncm_family = AF_INET; 1713 1714 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 1715 goto nla_put_failure; 1716 1717 /* type -1 is used for ALL */ 1718 if ((type == -1 || type == NETCONFA_FORWARDING) && 1719 nla_put_s32(skb, NETCONFA_FORWARDING, 1720 IPV4_DEVCONF(*devconf, FORWARDING)) < 0) 1721 goto nla_put_failure; 1722 if ((type == -1 || type == NETCONFA_RP_FILTER) && 1723 nla_put_s32(skb, NETCONFA_RP_FILTER, 1724 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) 1725 goto nla_put_failure; 1726 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 1727 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 1728 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) 1729 goto nla_put_failure; 1730 1731 return nlmsg_end(skb, nlh); 1732 1733nla_put_failure: 1734 nlmsg_cancel(skb, nlh); 1735 return -EMSGSIZE; 1736} 1737 1738void inet_netconf_notify_devconf(struct net *net, int type, int ifindex, 1739 struct ipv4_devconf *devconf) 1740{ 1741 struct sk_buff *skb; 1742 int err = -ENOBUFS; 1743 1744 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC); 1745 if (skb == NULL) 1746 goto errout; 1747 1748 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 1749 RTM_NEWNETCONF, 0, type); 1750 if (err < 0) { 1751 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1752 WARN_ON(err == -EMSGSIZE); 1753 kfree_skb(skb); 1754 goto errout; 1755 } 1756 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC); 1757 return; 1758errout: 1759 if (err < 0) 1760 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); 1761} 1762 1763static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { 1764 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1765 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 1766 [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, 1767}; 1768 1769static int inet_netconf_get_devconf(struct sk_buff *in_skb, 1770 struct nlmsghdr *nlh) 1771{ 1772 struct net *net = sock_net(in_skb->sk); 1773 struct nlattr *tb[NETCONFA_MAX+1]; 1774 struct netconfmsg *ncm; 1775 struct sk_buff *skb; 1776 struct ipv4_devconf *devconf; 1777 struct in_device *in_dev; 1778 struct net_device *dev; 1779 int ifindex; 1780 int err; 1781 1782 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 1783 devconf_ipv4_policy); 1784 if (err < 0) 1785 goto errout; 1786 1787 err = EINVAL; 1788 if (!tb[NETCONFA_IFINDEX]) 1789 goto errout; 1790 1791 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1792 switch (ifindex) { 1793 case NETCONFA_IFINDEX_ALL: 1794 devconf = net->ipv4.devconf_all; 1795 break; 1796 case NETCONFA_IFINDEX_DEFAULT: 1797 devconf = net->ipv4.devconf_dflt; 1798 break; 1799 default: 1800 dev = __dev_get_by_index(net, ifindex); 1801 if (dev == NULL) 1802 goto errout; 1803 in_dev = __in_dev_get_rtnl(dev); 1804 if (in_dev == NULL) 1805 goto errout; 1806 devconf = &in_dev->cnf; 1807 break; 1808 } 1809 1810 err = -ENOBUFS; 1811 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC); 1812 if (skb == NULL) 1813 goto errout; 1814 1815 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 1816 NETLINK_CB(in_skb).portid, 1817 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1818 -1); 1819 if (err < 0) { 1820 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1821 WARN_ON(err == -EMSGSIZE); 1822 kfree_skb(skb); 1823 goto errout; 1824 } 1825 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1826errout: 1827 return err; 1828} 1829 1830static int inet_netconf_dump_devconf(struct sk_buff *skb, 1831 struct netlink_callback *cb) 1832{ 1833 struct net *net = sock_net(skb->sk); 1834 int h, s_h; 1835 int idx, s_idx; 1836 struct net_device *dev; 1837 struct in_device *in_dev; 1838 struct hlist_head *head; 1839 1840 s_h = cb->args[0]; 1841 s_idx = idx = cb->args[1]; 1842 1843 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1844 idx = 0; 1845 head = &net->dev_index_head[h]; 1846 rcu_read_lock(); 1847 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ 1848 net->dev_base_seq; 1849 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1850 if (idx < s_idx) 1851 goto cont; 1852 in_dev = __in_dev_get_rcu(dev); 1853 if (!in_dev) 1854 goto cont; 1855 1856 if (inet_netconf_fill_devconf(skb, dev->ifindex, 1857 &in_dev->cnf, 1858 NETLINK_CB(cb->skb).portid, 1859 cb->nlh->nlmsg_seq, 1860 RTM_NEWNETCONF, 1861 NLM_F_MULTI, 1862 -1) <= 0) { 1863 rcu_read_unlock(); 1864 goto done; 1865 } 1866 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1867cont: 1868 idx++; 1869 } 1870 rcu_read_unlock(); 1871 } 1872 if (h == NETDEV_HASHENTRIES) { 1873 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 1874 net->ipv4.devconf_all, 1875 NETLINK_CB(cb->skb).portid, 1876 cb->nlh->nlmsg_seq, 1877 RTM_NEWNETCONF, NLM_F_MULTI, 1878 -1) <= 0) 1879 goto done; 1880 else 1881 h++; 1882 } 1883 if (h == NETDEV_HASHENTRIES + 1) { 1884 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 1885 net->ipv4.devconf_dflt, 1886 NETLINK_CB(cb->skb).portid, 1887 cb->nlh->nlmsg_seq, 1888 RTM_NEWNETCONF, NLM_F_MULTI, 1889 -1) <= 0) 1890 goto done; 1891 else 1892 h++; 1893 } 1894done: 1895 cb->args[0] = h; 1896 cb->args[1] = idx; 1897 1898 return skb->len; 1899} 1900 1901#ifdef CONFIG_SYSCTL 1902 1903static void devinet_copy_dflt_conf(struct net *net, int i) 1904{ 1905 struct net_device *dev; 1906 1907 rcu_read_lock(); 1908 for_each_netdev_rcu(net, dev) { 1909 struct in_device *in_dev; 1910 1911 in_dev = __in_dev_get_rcu(dev); 1912 if (in_dev && !test_bit(i, in_dev->cnf.state)) 1913 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 1914 } 1915 rcu_read_unlock(); 1916} 1917 1918/* called with RTNL locked */ 1919static void inet_forward_change(struct net *net) 1920{ 1921 struct net_device *dev; 1922 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 1923 1924 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 1925 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 1926 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1927 NETCONFA_IFINDEX_ALL, 1928 net->ipv4.devconf_all); 1929 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1930 NETCONFA_IFINDEX_DEFAULT, 1931 net->ipv4.devconf_dflt); 1932 1933 for_each_netdev(net, dev) { 1934 struct in_device *in_dev; 1935 if (on) 1936 dev_disable_lro(dev); 1937 rcu_read_lock(); 1938 in_dev = __in_dev_get_rcu(dev); 1939 if (in_dev) { 1940 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 1941 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1942 dev->ifindex, &in_dev->cnf); 1943 } 1944 rcu_read_unlock(); 1945 } 1946} 1947 1948static int devinet_conf_proc(struct ctl_table *ctl, int write, 1949 void __user *buffer, 1950 size_t *lenp, loff_t *ppos) 1951{ 1952 int old_value = *(int *)ctl->data; 1953 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1954 int new_value = *(int *)ctl->data; 1955 1956 if (write) { 1957 struct ipv4_devconf *cnf = ctl->extra1; 1958 struct net *net = ctl->extra2; 1959 int i = (int *)ctl->data - cnf->data; 1960 1961 set_bit(i, cnf->state); 1962 1963 if (cnf == net->ipv4.devconf_dflt) 1964 devinet_copy_dflt_conf(net, i); 1965 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || 1966 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) 1967 if ((new_value == 0) && (old_value != 0)) 1968 rt_cache_flush(net); 1969 if (i == IPV4_DEVCONF_RP_FILTER - 1 && 1970 new_value != old_value) { 1971 int ifindex; 1972 1973 if (cnf == net->ipv4.devconf_dflt) 1974 ifindex = NETCONFA_IFINDEX_DEFAULT; 1975 else if (cnf == net->ipv4.devconf_all) 1976 ifindex = NETCONFA_IFINDEX_ALL; 1977 else { 1978 struct in_device *idev = 1979 container_of(cnf, struct in_device, 1980 cnf); 1981 ifindex = idev->dev->ifindex; 1982 } 1983 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER, 1984 ifindex, cnf); 1985 } 1986 } 1987 1988 return ret; 1989} 1990 1991static int devinet_sysctl_forward(struct ctl_table *ctl, int write, 1992 void __user *buffer, 1993 size_t *lenp, loff_t *ppos) 1994{ 1995 int *valp = ctl->data; 1996 int val = *valp; 1997 loff_t pos = *ppos; 1998 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1999 2000 if (write && *valp != val) { 2001 struct net *net = ctl->extra2; 2002 2003 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { 2004 if (!rtnl_trylock()) { 2005 /* Restore the original values before restarting */ 2006 *valp = val; 2007 *ppos = pos; 2008 return restart_syscall(); 2009 } 2010 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { 2011 inet_forward_change(net); 2012 } else { 2013 struct ipv4_devconf *cnf = ctl->extra1; 2014 struct in_device *idev = 2015 container_of(cnf, struct in_device, cnf); 2016 if (*valp) 2017 dev_disable_lro(idev->dev); 2018 inet_netconf_notify_devconf(net, 2019 NETCONFA_FORWARDING, 2020 idev->dev->ifindex, 2021 cnf); 2022 } 2023 rtnl_unlock(); 2024 rt_cache_flush(net); 2025 } else 2026 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 2027 NETCONFA_IFINDEX_DEFAULT, 2028 net->ipv4.devconf_dflt); 2029 } 2030 2031 return ret; 2032} 2033 2034static int ipv4_doint_and_flush(struct ctl_table *ctl, int write, 2035 void __user *buffer, 2036 size_t *lenp, loff_t *ppos) 2037{ 2038 int *valp = ctl->data; 2039 int val = *valp; 2040 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 2041 struct net *net = ctl->extra2; 2042 2043 if (write && *valp != val) 2044 rt_cache_flush(net); 2045 2046 return ret; 2047} 2048 2049#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ 2050 { \ 2051 .procname = name, \ 2052 .data = ipv4_devconf.data + \ 2053 IPV4_DEVCONF_ ## attr - 1, \ 2054 .maxlen = sizeof(int), \ 2055 .mode = mval, \ 2056 .proc_handler = proc, \ 2057 .extra1 = &ipv4_devconf, \ 2058 } 2059 2060#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 2061 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) 2062 2063#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 2064 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) 2065 2066#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ 2067 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) 2068 2069#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 2070 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) 2071 2072static struct devinet_sysctl_table { 2073 struct ctl_table_header *sysctl_header; 2074 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; 2075} devinet_sysctl = { 2076 .devinet_vars = { 2077 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 2078 devinet_sysctl_forward), 2079 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 2080 2081 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 2082 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 2083 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 2084 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 2085 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 2086 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 2087 "accept_source_route"), 2088 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), 2089 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), 2090 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 2091 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 2092 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 2093 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 2094 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 2095 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 2096 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 2097 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 2098 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 2099 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), 2100 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), 2101 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION, 2102 "force_igmp_version"), 2103 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL, 2104 "igmpv2_unsolicited_report_interval"), 2105 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL, 2106 "igmpv3_unsolicited_report_interval"), 2107 2108 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 2109 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 2110 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 2111 "promote_secondaries"), 2112 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, 2113 "route_localnet"), 2114 }, 2115}; 2116 2117static int __devinet_sysctl_register(struct net *net, char *dev_name, 2118 struct ipv4_devconf *p) 2119{ 2120 int i; 2121 struct devinet_sysctl_table *t; 2122 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; 2123 2124 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 2125 if (!t) 2126 goto out; 2127 2128 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 2129 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 2130 t->devinet_vars[i].extra1 = p; 2131 t->devinet_vars[i].extra2 = net; 2132 } 2133 2134 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); 2135 2136 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); 2137 if (!t->sysctl_header) 2138 goto free; 2139 2140 p->sysctl = t; 2141 return 0; 2142 2143free: 2144 kfree(t); 2145out: 2146 return -ENOBUFS; 2147} 2148 2149static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) 2150{ 2151 struct devinet_sysctl_table *t = cnf->sysctl; 2152 2153 if (t == NULL) 2154 return; 2155 2156 cnf->sysctl = NULL; 2157 unregister_net_sysctl_table(t->sysctl_header); 2158 kfree(t); 2159} 2160 2161static void devinet_sysctl_register(struct in_device *idev) 2162{ 2163 neigh_sysctl_register(idev->dev, idev->arp_parms, NULL); 2164 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, 2165 &idev->cnf); 2166} 2167 2168static void devinet_sysctl_unregister(struct in_device *idev) 2169{ 2170 __devinet_sysctl_unregister(&idev->cnf); 2171 neigh_sysctl_unregister(idev->arp_parms); 2172} 2173 2174static struct ctl_table ctl_forward_entry[] = { 2175 { 2176 .procname = "ip_forward", 2177 .data = &ipv4_devconf.data[ 2178 IPV4_DEVCONF_FORWARDING - 1], 2179 .maxlen = sizeof(int), 2180 .mode = 0644, 2181 .proc_handler = devinet_sysctl_forward, 2182 .extra1 = &ipv4_devconf, 2183 .extra2 = &init_net, 2184 }, 2185 { }, 2186}; 2187#endif 2188 2189static __net_init int devinet_init_net(struct net *net) 2190{ 2191 int err; 2192 struct ipv4_devconf *all, *dflt; 2193#ifdef CONFIG_SYSCTL 2194 struct ctl_table *tbl = ctl_forward_entry; 2195 struct ctl_table_header *forw_hdr; 2196#endif 2197 2198 err = -ENOMEM; 2199 all = &ipv4_devconf; 2200 dflt = &ipv4_devconf_dflt; 2201 2202 if (!net_eq(net, &init_net)) { 2203 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); 2204 if (all == NULL) 2205 goto err_alloc_all; 2206 2207 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 2208 if (dflt == NULL) 2209 goto err_alloc_dflt; 2210 2211#ifdef CONFIG_SYSCTL 2212 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); 2213 if (tbl == NULL) 2214 goto err_alloc_ctl; 2215 2216 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; 2217 tbl[0].extra1 = all; 2218 tbl[0].extra2 = net; 2219#endif 2220 } 2221 2222#ifdef CONFIG_SYSCTL 2223 err = __devinet_sysctl_register(net, "all", all); 2224 if (err < 0) 2225 goto err_reg_all; 2226 2227 err = __devinet_sysctl_register(net, "default", dflt); 2228 if (err < 0) 2229 goto err_reg_dflt; 2230 2231 err = -ENOMEM; 2232 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); 2233 if (forw_hdr == NULL) 2234 goto err_reg_ctl; 2235 net->ipv4.forw_hdr = forw_hdr; 2236#endif 2237 2238 net->ipv4.devconf_all = all; 2239 net->ipv4.devconf_dflt = dflt; 2240 return 0; 2241 2242#ifdef CONFIG_SYSCTL 2243err_reg_ctl: 2244 __devinet_sysctl_unregister(dflt); 2245err_reg_dflt: 2246 __devinet_sysctl_unregister(all); 2247err_reg_all: 2248 if (tbl != ctl_forward_entry) 2249 kfree(tbl); 2250err_alloc_ctl: 2251#endif 2252 if (dflt != &ipv4_devconf_dflt) 2253 kfree(dflt); 2254err_alloc_dflt: 2255 if (all != &ipv4_devconf) 2256 kfree(all); 2257err_alloc_all: 2258 return err; 2259} 2260 2261static __net_exit void devinet_exit_net(struct net *net) 2262{ 2263#ifdef CONFIG_SYSCTL 2264 struct ctl_table *tbl; 2265 2266 tbl = net->ipv4.forw_hdr->ctl_table_arg; 2267 unregister_net_sysctl_table(net->ipv4.forw_hdr); 2268 __devinet_sysctl_unregister(net->ipv4.devconf_dflt); 2269 __devinet_sysctl_unregister(net->ipv4.devconf_all); 2270 kfree(tbl); 2271#endif 2272 kfree(net->ipv4.devconf_dflt); 2273 kfree(net->ipv4.devconf_all); 2274} 2275 2276static __net_initdata struct pernet_operations devinet_ops = { 2277 .init = devinet_init_net, 2278 .exit = devinet_exit_net, 2279}; 2280 2281static struct rtnl_af_ops inet_af_ops = { 2282 .family = AF_INET, 2283 .fill_link_af = inet_fill_link_af, 2284 .get_link_af_size = inet_get_link_af_size, 2285 .validate_link_af = inet_validate_link_af, 2286 .set_link_af = inet_set_link_af, 2287}; 2288 2289void __init devinet_init(void) 2290{ 2291 int i; 2292 2293 for (i = 0; i < IN4_ADDR_HSIZE; i++) 2294 INIT_HLIST_HEAD(&inet_addr_lst[i]); 2295 2296 register_pernet_subsys(&devinet_ops); 2297 2298 register_gifconf(PF_INET, inet_gifconf); 2299 register_netdevice_notifier(&ip_netdev_notifier); 2300 2301 schedule_delayed_work(&check_lifetime_work, 0); 2302 2303 rtnl_af_register(&inet_af_ops); 2304 2305 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); 2306 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); 2307 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); 2308 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, 2309 inet_netconf_dump_devconf, NULL); 2310} 2311 2312