1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 /* 18 * Changes: 19 * 20 * Janos Farkas : delete timer on ifdown 21 * <chexum@bankinf.banki.hu> 22 * Andi Kleen : kill double kfree on module 23 * unload. 24 * Maciej W. Rozycki : FDDI support 25 * sekiya@USAGI : Don't send too many RS 26 * packets. 27 * yoshfuji@USAGI : Fixed interval between DAD 28 * packets. 29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 30 * address validation timer. 31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 32 * support. 33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 34 * address on a same interface. 35 * YOSHIFUJI Hideaki @USAGI : ARCnet support 36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 37 * seq_file. 38 * YOSHIFUJI Hideaki @USAGI : improved source address 39 * selection; consider scope, 40 * status etc. 41 */ 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/socket.h> 46 #include <linux/sockios.h> 47 #include <linux/net.h> 48 #include <linux/in6.h> 49 #include <linux/netdevice.h> 50 #include <linux/if_addr.h> 51 #include <linux/if_arp.h> 52 #include <linux/if_arcnet.h> 53 #include <linux/if_infiniband.h> 54 #include <linux/route.h> 55 #include <linux/inetdevice.h> 56 #include <linux/init.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <asm/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 91 /* Set to 3 to get tracing... */ 92 #define ACONF_DEBUG 2 93 94 #if ACONF_DEBUG >= 3 95 #define ADBG(x) printk x 96 #else 97 #define ADBG(x) 98 #endif 99 100 #define INFINITY_LIFE_TIME 0xFFFFFFFF 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 102 103 #ifdef CONFIG_SYSCTL 104 static void addrconf_sysctl_register(struct inet6_dev *idev); 105 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 106 #else 107 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 108 { 109 } 110 111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 112 { 113 } 114 #endif 115 116 #ifdef CONFIG_IPV6_PRIVACY 117 static int __ipv6_regen_rndid(struct inet6_dev *idev); 118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 119 static void ipv6_regen_rndid(unsigned long data); 120 121 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 122 #endif 123 124 static int ipv6_count_addresses(struct inet6_dev *idev); 125 126 /* 127 * Configured unicast address hash table 128 */ 129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 130 static DEFINE_RWLOCK(addrconf_hash_lock); 131 132 static void addrconf_verify(unsigned long); 133 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 135 static DEFINE_SPINLOCK(addrconf_verify_lock); 136 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 139 140 static int addrconf_ifdown(struct net_device *dev, int how); 141 142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 143 static void addrconf_dad_timer(unsigned long data); 144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 145 static void addrconf_dad_run(struct inet6_dev *idev); 146 static void addrconf_rs_timer(unsigned long data); 147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 149 150 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 151 struct prefix_info *pinfo); 152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 153 struct net_device *dev); 154 155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 156 157 struct ipv6_devconf ipv6_devconf __read_mostly = { 158 .forwarding = 0, 159 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 160 .mtu6 = IPV6_MIN_MTU, 161 .accept_ra = 1, 162 .accept_redirects = 1, 163 .autoconf = 1, 164 .force_mld_version = 0, 165 .dad_transmits = 1, 166 .rtr_solicits = MAX_RTR_SOLICITATIONS, 167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 169 #ifdef CONFIG_IPV6_PRIVACY 170 .use_tempaddr = 0, 171 .temp_valid_lft = TEMP_VALID_LIFETIME, 172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 173 .regen_max_retry = REGEN_MAX_RETRY, 174 .max_desync_factor = MAX_DESYNC_FACTOR, 175 #endif 176 .max_addresses = IPV6_MAX_ADDRESSES, 177 .accept_ra_defrtr = 1, 178 .accept_ra_pinfo = 1, 179 #ifdef CONFIG_IPV6_ROUTER_PREF 180 .accept_ra_rtr_pref = 1, 181 .rtr_probe_interval = 60 * HZ, 182 #ifdef CONFIG_IPV6_ROUTE_INFO 183 .accept_ra_rt_info_max_plen = 0, 184 #endif 185 #endif 186 .proxy_ndp = 0, 187 .accept_source_route = 0, /* we do not accept RH0 by default. */ 188 }; 189 190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .dad_transmits = 1, 198 .rtr_solicits = MAX_RTR_SOLICITATIONS, 199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 201 #ifdef CONFIG_IPV6_PRIVACY 202 .use_tempaddr = 0, 203 .temp_valid_lft = TEMP_VALID_LIFETIME, 204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 205 .regen_max_retry = REGEN_MAX_RETRY, 206 .max_desync_factor = MAX_DESYNC_FACTOR, 207 #endif 208 .max_addresses = IPV6_MAX_ADDRESSES, 209 .accept_ra_defrtr = 1, 210 .accept_ra_pinfo = 1, 211 #ifdef CONFIG_IPV6_ROUTER_PREF 212 .accept_ra_rtr_pref = 1, 213 .rtr_probe_interval = 60 * HZ, 214 #ifdef CONFIG_IPV6_ROUTE_INFO 215 .accept_ra_rt_info_max_plen = 0, 216 #endif 217 #endif 218 .proxy_ndp = 0, 219 .accept_source_route = 0, /* we do not accept RH0 by default. */ 220 }; 221 222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 225 226 /* Check if a valid qdisc is available */ 227 static inline int addrconf_qdisc_ok(struct net_device *dev) 228 { 229 return (dev->qdisc != &noop_qdisc); 230 } 231 232 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 233 { 234 if (del_timer(&ifp->timer)) 235 __in6_ifa_put(ifp); 236 } 237 238 enum addrconf_timer_t 239 { 240 AC_NONE, 241 AC_DAD, 242 AC_RS, 243 }; 244 245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 246 enum addrconf_timer_t what, 247 unsigned long when) 248 { 249 if (!del_timer(&ifp->timer)) 250 in6_ifa_hold(ifp); 251 252 switch (what) { 253 case AC_DAD: 254 ifp->timer.function = addrconf_dad_timer; 255 break; 256 case AC_RS: 257 ifp->timer.function = addrconf_rs_timer; 258 break; 259 default:; 260 } 261 ifp->timer.expires = jiffies + when; 262 add_timer(&ifp->timer); 263 } 264 265 static int snmp6_alloc_dev(struct inet6_dev *idev) 266 { 267 if (snmp_mib_init((void **)idev->stats.ipv6, 268 sizeof(struct ipstats_mib)) < 0) 269 goto err_ip; 270 if (snmp_mib_init((void **)idev->stats.icmpv6, 271 sizeof(struct icmpv6_mib)) < 0) 272 goto err_icmp; 273 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 274 sizeof(struct icmpv6msg_mib)) < 0) 275 goto err_icmpmsg; 276 277 return 0; 278 279 err_icmpmsg: 280 snmp_mib_free((void **)idev->stats.icmpv6); 281 err_icmp: 282 snmp_mib_free((void **)idev->stats.ipv6); 283 err_ip: 284 return -ENOMEM; 285 } 286 287 static void snmp6_free_dev(struct inet6_dev *idev) 288 { 289 snmp_mib_free((void **)idev->stats.icmpv6msg); 290 snmp_mib_free((void **)idev->stats.icmpv6); 291 snmp_mib_free((void **)idev->stats.ipv6); 292 } 293 294 /* Nobody refers to this device, we may destroy it. */ 295 296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 297 { 298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 299 kfree(idev); 300 } 301 302 void in6_dev_finish_destroy(struct inet6_dev *idev) 303 { 304 struct net_device *dev = idev->dev; 305 BUG_TRAP(idev->addr_list==NULL); 306 BUG_TRAP(idev->mc_list==NULL); 307 #ifdef NET_REFCNT_DEBUG 308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 309 #endif 310 dev_put(dev); 311 if (!idev->dead) { 312 printk("Freeing alive inet6 device %p\n", idev); 313 return; 314 } 315 snmp6_free_dev(idev); 316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 317 } 318 319 EXPORT_SYMBOL(in6_dev_finish_destroy); 320 321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 322 { 323 struct inet6_dev *ndev; 324 struct in6_addr maddr; 325 326 ASSERT_RTNL(); 327 328 if (dev->mtu < IPV6_MIN_MTU) 329 return NULL; 330 331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 332 333 if (ndev == NULL) 334 return NULL; 335 336 rwlock_init(&ndev->lock); 337 ndev->dev = dev; 338 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 339 ndev->cnf.mtu6 = dev->mtu; 340 ndev->cnf.sysctl = NULL; 341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 342 if (ndev->nd_parms == NULL) { 343 kfree(ndev); 344 return NULL; 345 } 346 /* We refer to the device */ 347 dev_hold(dev); 348 349 if (snmp6_alloc_dev(ndev) < 0) { 350 ADBG((KERN_WARNING 351 "%s(): cannot allocate memory for statistics; dev=%s.\n", 352 __func__, dev->name)); 353 neigh_parms_release(&nd_tbl, ndev->nd_parms); 354 ndev->dead = 1; 355 in6_dev_finish_destroy(ndev); 356 return NULL; 357 } 358 359 if (snmp6_register_dev(ndev) < 0) { 360 ADBG((KERN_WARNING 361 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 362 __func__, dev->name)); 363 neigh_parms_release(&nd_tbl, ndev->nd_parms); 364 ndev->dead = 1; 365 in6_dev_finish_destroy(ndev); 366 return NULL; 367 } 368 369 /* One reference from device. We must do this before 370 * we invoke __ipv6_regen_rndid(). 371 */ 372 in6_dev_hold(ndev); 373 374 #ifdef CONFIG_IPV6_PRIVACY 375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 376 if ((dev->flags&IFF_LOOPBACK) || 377 dev->type == ARPHRD_TUNNEL || 378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 379 dev->type == ARPHRD_SIT || 380 #endif 381 dev->type == ARPHRD_NONE) { 382 printk(KERN_INFO 383 "%s: Disabled Privacy Extensions\n", 384 dev->name); 385 ndev->cnf.use_tempaddr = -1; 386 387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 388 printk(KERN_INFO 389 "%s: Disabled Multicast RS\n", 390 dev->name); 391 ndev->cnf.rtr_solicits = 0; 392 } 393 } else { 394 in6_dev_hold(ndev); 395 ipv6_regen_rndid((unsigned long) ndev); 396 } 397 #endif 398 399 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 400 ndev->if_flags |= IF_READY; 401 402 ipv6_mc_init_dev(ndev); 403 ndev->tstamp = jiffies; 404 addrconf_sysctl_register(ndev); 405 /* protected by rtnl_lock */ 406 rcu_assign_pointer(dev->ip6_ptr, ndev); 407 408 /* Join all-node multicast group */ 409 ipv6_addr_all_nodes(&maddr); 410 ipv6_dev_mc_inc(dev, &maddr); 411 412 return ndev; 413 } 414 415 struct inet6_dev * ipv6_find_idev(struct net_device *dev) 416 { 417 struct inet6_dev *idev; 418 419 ASSERT_RTNL(); 420 421 if ((idev = __in6_dev_get(dev)) == NULL) { 422 if ((idev = ipv6_add_dev(dev)) == NULL) 423 return NULL; 424 } 425 426 if (dev->flags&IFF_UP) 427 ipv6_mc_up(idev); 428 return idev; 429 } 430 431 #ifdef CONFIG_SYSCTL 432 static void dev_forward_change(struct inet6_dev *idev) 433 { 434 struct net_device *dev; 435 struct inet6_ifaddr *ifa; 436 struct in6_addr addr; 437 438 if (!idev) 439 return; 440 dev = idev->dev; 441 if (dev && (dev->flags & IFF_MULTICAST)) { 442 ipv6_addr_all_routers(&addr); 443 444 if (idev->cnf.forwarding) 445 ipv6_dev_mc_inc(dev, &addr); 446 else 447 ipv6_dev_mc_dec(dev, &addr); 448 } 449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 450 if (ifa->flags&IFA_F_TENTATIVE) 451 continue; 452 if (idev->cnf.forwarding) 453 addrconf_join_anycast(ifa); 454 else 455 addrconf_leave_anycast(ifa); 456 } 457 } 458 459 460 static void addrconf_forward_change(struct net *net, __s32 newf) 461 { 462 struct net_device *dev; 463 struct inet6_dev *idev; 464 465 read_lock(&dev_base_lock); 466 for_each_netdev(net, dev) { 467 rcu_read_lock(); 468 idev = __in6_dev_get(dev); 469 if (idev) { 470 int changed = (!idev->cnf.forwarding) ^ (!newf); 471 idev->cnf.forwarding = newf; 472 if (changed) 473 dev_forward_change(idev); 474 } 475 rcu_read_unlock(); 476 } 477 read_unlock(&dev_base_lock); 478 } 479 480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 481 { 482 struct net *net; 483 484 net = (struct net *)table->extra2; 485 if (p == &net->ipv6.devconf_dflt->forwarding) 486 return; 487 488 if (p == &net->ipv6.devconf_all->forwarding) { 489 __s32 newf = net->ipv6.devconf_all->forwarding; 490 net->ipv6.devconf_dflt->forwarding = newf; 491 addrconf_forward_change(net, newf); 492 } else if ((!*p) ^ (!old)) 493 dev_forward_change((struct inet6_dev *)table->extra1); 494 495 if (*p) 496 rt6_purge_dflt_routers(net); 497 } 498 #endif 499 500 /* Nobody refers to this ifaddr, destroy it */ 501 502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 503 { 504 BUG_TRAP(ifp->if_next==NULL); 505 BUG_TRAP(ifp->lst_next==NULL); 506 #ifdef NET_REFCNT_DEBUG 507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 508 #endif 509 510 in6_dev_put(ifp->idev); 511 512 if (del_timer(&ifp->timer)) 513 printk("Timer is still running, when freeing ifa=%p\n", ifp); 514 515 if (!ifp->dead) { 516 printk("Freeing alive inet6 address %p\n", ifp); 517 return; 518 } 519 dst_release(&ifp->rt->u.dst); 520 521 kfree(ifp); 522 } 523 524 static void 525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 526 { 527 struct inet6_ifaddr *ifa, **ifap; 528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 529 530 /* 531 * Each device address list is sorted in order of scope - 532 * global before linklocal. 533 */ 534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 535 ifap = &ifa->if_next) { 536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 537 break; 538 } 539 540 ifp->if_next = *ifap; 541 *ifap = ifp; 542 } 543 544 /* 545 * Hash function taken from net_alias.c 546 */ 547 static u8 ipv6_addr_hash(const struct in6_addr *addr) 548 { 549 __u32 word; 550 551 /* 552 * We perform the hash function over the last 64 bits of the address 553 * This will include the IEEE address token on links that support it. 554 */ 555 556 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 557 word ^= (word >> 16); 558 word ^= (word >> 8); 559 560 return ((word ^ (word >> 4)) & 0x0f); 561 } 562 563 /* On success it returns ifp with increased reference count */ 564 565 static struct inet6_ifaddr * 566 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 567 int scope, u32 flags) 568 { 569 struct inet6_ifaddr *ifa = NULL; 570 struct rt6_info *rt; 571 int hash; 572 int err = 0; 573 574 rcu_read_lock_bh(); 575 if (idev->dead) { 576 err = -ENODEV; /*XXX*/ 577 goto out2; 578 } 579 580 write_lock(&addrconf_hash_lock); 581 582 /* Ignore adding duplicate addresses on an interface */ 583 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 584 ADBG(("ipv6_add_addr: already assigned\n")); 585 err = -EEXIST; 586 goto out; 587 } 588 589 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 590 591 if (ifa == NULL) { 592 ADBG(("ipv6_add_addr: malloc failed\n")); 593 err = -ENOBUFS; 594 goto out; 595 } 596 597 rt = addrconf_dst_alloc(idev, addr, 0); 598 if (IS_ERR(rt)) { 599 err = PTR_ERR(rt); 600 goto out; 601 } 602 603 ipv6_addr_copy(&ifa->addr, addr); 604 605 spin_lock_init(&ifa->lock); 606 init_timer(&ifa->timer); 607 ifa->timer.data = (unsigned long) ifa; 608 ifa->scope = scope; 609 ifa->prefix_len = pfxlen; 610 ifa->flags = flags | IFA_F_TENTATIVE; 611 ifa->cstamp = ifa->tstamp = jiffies; 612 613 ifa->rt = rt; 614 615 /* 616 * part one of RFC 4429, section 3.3 617 * We should not configure an address as 618 * optimistic if we do not yet know the link 619 * layer address of our nexhop router 620 */ 621 622 if (rt->rt6i_nexthop == NULL) 623 ifa->flags &= ~IFA_F_OPTIMISTIC; 624 625 ifa->idev = idev; 626 in6_dev_hold(idev); 627 /* For caller */ 628 in6_ifa_hold(ifa); 629 630 /* Add to big hash table */ 631 hash = ipv6_addr_hash(addr); 632 633 ifa->lst_next = inet6_addr_lst[hash]; 634 inet6_addr_lst[hash] = ifa; 635 in6_ifa_hold(ifa); 636 write_unlock(&addrconf_hash_lock); 637 638 write_lock(&idev->lock); 639 /* Add to inet6_dev unicast addr list. */ 640 ipv6_link_dev_addr(idev, ifa); 641 642 #ifdef CONFIG_IPV6_PRIVACY 643 if (ifa->flags&IFA_F_TEMPORARY) { 644 ifa->tmp_next = idev->tempaddr_list; 645 idev->tempaddr_list = ifa; 646 in6_ifa_hold(ifa); 647 } 648 #endif 649 650 in6_ifa_hold(ifa); 651 write_unlock(&idev->lock); 652 out2: 653 rcu_read_unlock_bh(); 654 655 if (likely(err == 0)) 656 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 657 else { 658 kfree(ifa); 659 ifa = ERR_PTR(err); 660 } 661 662 return ifa; 663 out: 664 write_unlock(&addrconf_hash_lock); 665 goto out2; 666 } 667 668 /* This function wants to get referenced ifp and releases it before return */ 669 670 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 671 { 672 struct inet6_ifaddr *ifa, **ifap; 673 struct inet6_dev *idev = ifp->idev; 674 int hash; 675 int deleted = 0, onlink = 0; 676 unsigned long expires = jiffies; 677 678 hash = ipv6_addr_hash(&ifp->addr); 679 680 ifp->dead = 1; 681 682 write_lock_bh(&addrconf_hash_lock); 683 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 684 ifap = &ifa->lst_next) { 685 if (ifa == ifp) { 686 *ifap = ifa->lst_next; 687 __in6_ifa_put(ifp); 688 ifa->lst_next = NULL; 689 break; 690 } 691 } 692 write_unlock_bh(&addrconf_hash_lock); 693 694 write_lock_bh(&idev->lock); 695 #ifdef CONFIG_IPV6_PRIVACY 696 if (ifp->flags&IFA_F_TEMPORARY) { 697 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 698 ifap = &ifa->tmp_next) { 699 if (ifa == ifp) { 700 *ifap = ifa->tmp_next; 701 if (ifp->ifpub) { 702 in6_ifa_put(ifp->ifpub); 703 ifp->ifpub = NULL; 704 } 705 __in6_ifa_put(ifp); 706 ifa->tmp_next = NULL; 707 break; 708 } 709 } 710 } 711 #endif 712 713 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 714 if (ifa == ifp) { 715 *ifap = ifa->if_next; 716 __in6_ifa_put(ifp); 717 ifa->if_next = NULL; 718 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 719 break; 720 deleted = 1; 721 continue; 722 } else if (ifp->flags & IFA_F_PERMANENT) { 723 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 724 ifp->prefix_len)) { 725 if (ifa->flags & IFA_F_PERMANENT) { 726 onlink = 1; 727 if (deleted) 728 break; 729 } else { 730 unsigned long lifetime; 731 732 if (!onlink) 733 onlink = -1; 734 735 spin_lock(&ifa->lock); 736 lifetime = min_t(unsigned long, 737 ifa->valid_lft, 0x7fffffffUL/HZ); 738 if (time_before(expires, 739 ifa->tstamp + lifetime * HZ)) 740 expires = ifa->tstamp + lifetime * HZ; 741 spin_unlock(&ifa->lock); 742 } 743 } 744 } 745 ifap = &ifa->if_next; 746 } 747 write_unlock_bh(&idev->lock); 748 749 ipv6_ifa_notify(RTM_DELADDR, ifp); 750 751 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 752 753 addrconf_del_timer(ifp); 754 755 /* 756 * Purge or update corresponding prefix 757 * 758 * 1) we don't purge prefix here if address was not permanent. 759 * prefix is managed by its own lifetime. 760 * 2) if there're no addresses, delete prefix. 761 * 3) if there're still other permanent address(es), 762 * corresponding prefix is still permanent. 763 * 4) otherwise, update prefix lifetime to the 764 * longest valid lifetime among the corresponding 765 * addresses on the device. 766 * Note: subsequent RA will update lifetime. 767 * 768 * --yoshfuji 769 */ 770 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 771 struct in6_addr prefix; 772 struct rt6_info *rt; 773 struct net *net = dev_net(ifp->idev->dev); 774 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 775 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 776 777 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 778 if (onlink == 0) { 779 ip6_del_rt(rt); 780 rt = NULL; 781 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 782 rt->rt6i_expires = expires; 783 rt->rt6i_flags |= RTF_EXPIRES; 784 } 785 } 786 dst_release(&rt->u.dst); 787 } 788 789 in6_ifa_put(ifp); 790 } 791 792 #ifdef CONFIG_IPV6_PRIVACY 793 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 794 { 795 struct inet6_dev *idev = ifp->idev; 796 struct in6_addr addr, *tmpaddr; 797 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 798 unsigned long regen_advance; 799 int tmp_plen; 800 int ret = 0; 801 int max_addresses; 802 u32 addr_flags; 803 804 write_lock(&idev->lock); 805 if (ift) { 806 spin_lock_bh(&ift->lock); 807 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 808 spin_unlock_bh(&ift->lock); 809 tmpaddr = &addr; 810 } else { 811 tmpaddr = NULL; 812 } 813 retry: 814 in6_dev_hold(idev); 815 if (idev->cnf.use_tempaddr <= 0) { 816 write_unlock(&idev->lock); 817 printk(KERN_INFO 818 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 819 in6_dev_put(idev); 820 ret = -1; 821 goto out; 822 } 823 spin_lock_bh(&ifp->lock); 824 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 825 idev->cnf.use_tempaddr = -1; /*XXX*/ 826 spin_unlock_bh(&ifp->lock); 827 write_unlock(&idev->lock); 828 printk(KERN_WARNING 829 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 830 in6_dev_put(idev); 831 ret = -1; 832 goto out; 833 } 834 in6_ifa_hold(ifp); 835 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 836 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 837 spin_unlock_bh(&ifp->lock); 838 write_unlock(&idev->lock); 839 printk(KERN_WARNING 840 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 841 in6_ifa_put(ifp); 842 in6_dev_put(idev); 843 ret = -1; 844 goto out; 845 } 846 memcpy(&addr.s6_addr[8], idev->rndid, 8); 847 tmp_valid_lft = min_t(__u32, 848 ifp->valid_lft, 849 idev->cnf.temp_valid_lft); 850 tmp_prefered_lft = min_t(__u32, 851 ifp->prefered_lft, 852 idev->cnf.temp_prefered_lft - desync_factor / HZ); 853 tmp_plen = ifp->prefix_len; 854 max_addresses = idev->cnf.max_addresses; 855 tmp_cstamp = ifp->cstamp; 856 tmp_tstamp = ifp->tstamp; 857 spin_unlock_bh(&ifp->lock); 858 859 regen_advance = idev->cnf.regen_max_retry * 860 idev->cnf.dad_transmits * 861 idev->nd_parms->retrans_time / HZ; 862 write_unlock(&idev->lock); 863 864 /* A temporary address is created only if this calculated Preferred 865 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 866 * an implementation must not create a temporary address with a zero 867 * Preferred Lifetime. 868 */ 869 if (tmp_prefered_lft <= regen_advance) { 870 in6_ifa_put(ifp); 871 in6_dev_put(idev); 872 ret = -1; 873 goto out; 874 } 875 876 addr_flags = IFA_F_TEMPORARY; 877 /* set in addrconf_prefix_rcv() */ 878 if (ifp->flags & IFA_F_OPTIMISTIC) 879 addr_flags |= IFA_F_OPTIMISTIC; 880 881 ift = !max_addresses || 882 ipv6_count_addresses(idev) < max_addresses ? 883 ipv6_add_addr(idev, &addr, tmp_plen, 884 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 885 addr_flags) : NULL; 886 if (!ift || IS_ERR(ift)) { 887 in6_ifa_put(ifp); 888 in6_dev_put(idev); 889 printk(KERN_INFO 890 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 891 tmpaddr = &addr; 892 write_lock(&idev->lock); 893 goto retry; 894 } 895 896 spin_lock_bh(&ift->lock); 897 ift->ifpub = ifp; 898 ift->valid_lft = tmp_valid_lft; 899 ift->prefered_lft = tmp_prefered_lft; 900 ift->cstamp = tmp_cstamp; 901 ift->tstamp = tmp_tstamp; 902 spin_unlock_bh(&ift->lock); 903 904 addrconf_dad_start(ift, 0); 905 in6_ifa_put(ift); 906 in6_dev_put(idev); 907 out: 908 return ret; 909 } 910 #endif 911 912 /* 913 * Choose an appropriate source address (RFC3484) 914 */ 915 enum { 916 IPV6_SADDR_RULE_INIT = 0, 917 IPV6_SADDR_RULE_LOCAL, 918 IPV6_SADDR_RULE_SCOPE, 919 IPV6_SADDR_RULE_PREFERRED, 920 #ifdef CONFIG_IPV6_MIP6 921 IPV6_SADDR_RULE_HOA, 922 #endif 923 IPV6_SADDR_RULE_OIF, 924 IPV6_SADDR_RULE_LABEL, 925 #ifdef CONFIG_IPV6_PRIVACY 926 IPV6_SADDR_RULE_PRIVACY, 927 #endif 928 IPV6_SADDR_RULE_ORCHID, 929 IPV6_SADDR_RULE_PREFIX, 930 IPV6_SADDR_RULE_MAX 931 }; 932 933 struct ipv6_saddr_score { 934 int rule; 935 int addr_type; 936 struct inet6_ifaddr *ifa; 937 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 938 int scopedist; 939 int matchlen; 940 }; 941 942 struct ipv6_saddr_dst { 943 const struct in6_addr *addr; 944 int ifindex; 945 int scope; 946 int label; 947 unsigned int prefs; 948 }; 949 950 static inline int ipv6_saddr_preferred(int type) 951 { 952 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 953 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 954 return 1; 955 return 0; 956 } 957 958 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score, 959 struct ipv6_saddr_dst *dst, 960 int i) 961 { 962 int ret; 963 964 if (i <= score->rule) { 965 switch (i) { 966 case IPV6_SADDR_RULE_SCOPE: 967 ret = score->scopedist; 968 break; 969 case IPV6_SADDR_RULE_PREFIX: 970 ret = score->matchlen; 971 break; 972 default: 973 ret = !!test_bit(i, score->scorebits); 974 } 975 goto out; 976 } 977 978 switch (i) { 979 case IPV6_SADDR_RULE_INIT: 980 /* Rule 0: remember if hiscore is not ready yet */ 981 ret = !!score->ifa; 982 break; 983 case IPV6_SADDR_RULE_LOCAL: 984 /* Rule 1: Prefer same address */ 985 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 986 break; 987 case IPV6_SADDR_RULE_SCOPE: 988 /* Rule 2: Prefer appropriate scope 989 * 990 * ret 991 * ^ 992 * -1 | d 15 993 * ---+--+-+---> scope 994 * | 995 * | d is scope of the destination. 996 * B-d | \ 997 * | \ <- smaller scope is better if 998 * B-15 | \ if scope is enough for destinaion. 999 * | ret = B - scope (-1 <= scope >= d <= 15). 1000 * d-C-1 | / 1001 * |/ <- greater is better 1002 * -C / if scope is not enough for destination. 1003 * /| ret = scope - C (-1 <= d < scope <= 15). 1004 * 1005 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1006 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1007 * Assume B = 0 and we get C > 29. 1008 */ 1009 ret = __ipv6_addr_src_scope(score->addr_type); 1010 if (ret >= dst->scope) 1011 ret = -ret; 1012 else 1013 ret -= 128; /* 30 is enough */ 1014 score->scopedist = ret; 1015 break; 1016 case IPV6_SADDR_RULE_PREFERRED: 1017 /* Rule 3: Avoid deprecated and optimistic addresses */ 1018 ret = ipv6_saddr_preferred(score->addr_type) || 1019 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1020 break; 1021 #ifdef CONFIG_IPV6_MIP6 1022 case IPV6_SADDR_RULE_HOA: 1023 { 1024 /* Rule 4: Prefer home address */ 1025 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1026 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1027 break; 1028 } 1029 #endif 1030 case IPV6_SADDR_RULE_OIF: 1031 /* Rule 5: Prefer outgoing interface */ 1032 ret = (!dst->ifindex || 1033 dst->ifindex == score->ifa->idev->dev->ifindex); 1034 break; 1035 case IPV6_SADDR_RULE_LABEL: 1036 /* Rule 6: Prefer matching label */ 1037 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type, 1038 score->ifa->idev->dev->ifindex) == dst->label; 1039 break; 1040 #ifdef CONFIG_IPV6_PRIVACY 1041 case IPV6_SADDR_RULE_PRIVACY: 1042 { 1043 /* Rule 7: Prefer public address 1044 * Note: prefer temprary address if use_tempaddr >= 2 1045 */ 1046 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1047 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1048 score->ifa->idev->cnf.use_tempaddr >= 2; 1049 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1050 break; 1051 } 1052 #endif 1053 case IPV6_SADDR_RULE_ORCHID: 1054 /* Rule 8-: Prefer ORCHID vs ORCHID or 1055 * non-ORCHID vs non-ORCHID 1056 */ 1057 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1058 ipv6_addr_orchid(dst->addr)); 1059 break; 1060 case IPV6_SADDR_RULE_PREFIX: 1061 /* Rule 8: Use longest matching prefix */ 1062 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1063 dst->addr); 1064 break; 1065 default: 1066 ret = 0; 1067 } 1068 1069 if (ret) 1070 __set_bit(i, score->scorebits); 1071 score->rule = i; 1072 out: 1073 return ret; 1074 } 1075 1076 int ipv6_dev_get_saddr(struct net_device *dst_dev, 1077 const struct in6_addr *daddr, unsigned int prefs, 1078 struct in6_addr *saddr) 1079 { 1080 struct ipv6_saddr_score scores[2], 1081 *score = &scores[0], *hiscore = &scores[1]; 1082 struct net *net = dev_net(dst_dev); 1083 struct ipv6_saddr_dst dst; 1084 struct net_device *dev; 1085 int dst_type; 1086 1087 dst_type = __ipv6_addr_type(daddr); 1088 dst.addr = daddr; 1089 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1090 dst.scope = __ipv6_addr_src_scope(dst_type); 1091 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex); 1092 dst.prefs = prefs; 1093 1094 hiscore->rule = -1; 1095 hiscore->ifa = NULL; 1096 1097 read_lock(&dev_base_lock); 1098 rcu_read_lock(); 1099 1100 for_each_netdev(net, dev) { 1101 struct inet6_dev *idev; 1102 1103 /* Candidate Source Address (section 4) 1104 * - multicast and link-local destination address, 1105 * the set of candidate source address MUST only 1106 * include addresses assigned to interfaces 1107 * belonging to the same link as the outgoing 1108 * interface. 1109 * (- For site-local destination addresses, the 1110 * set of candidate source addresses MUST only 1111 * include addresses assigned to interfaces 1112 * belonging to the same site as the outgoing 1113 * interface.) 1114 */ 1115 if (((dst_type & IPV6_ADDR_MULTICAST) || 1116 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1117 dst.ifindex && dev->ifindex != dst.ifindex) 1118 continue; 1119 1120 idev = __in6_dev_get(dev); 1121 if (!idev) 1122 continue; 1123 1124 read_lock_bh(&idev->lock); 1125 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1126 int i; 1127 1128 /* 1129 * - Tentative Address (RFC2462 section 5.4) 1130 * - A tentative address is not considered 1131 * "assigned to an interface" in the traditional 1132 * sense, unless it is also flagged as optimistic. 1133 * - Candidate Source Address (section 4) 1134 * - In any case, anycast addresses, multicast 1135 * addresses, and the unspecified address MUST 1136 * NOT be included in a candidate set. 1137 */ 1138 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1139 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1140 continue; 1141 1142 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1143 1144 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1145 score->addr_type & IPV6_ADDR_MULTICAST)) { 1146 LIMIT_NETDEBUG(KERN_DEBUG 1147 "ADDRCONF: unspecified / multicast address " 1148 "assigned as unicast address on %s", 1149 dev->name); 1150 continue; 1151 } 1152 1153 score->rule = -1; 1154 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1155 1156 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1157 int minihiscore, miniscore; 1158 1159 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i); 1160 miniscore = ipv6_get_saddr_eval(score, &dst, i); 1161 1162 if (minihiscore > miniscore) { 1163 if (i == IPV6_SADDR_RULE_SCOPE && 1164 score->scopedist > 0) { 1165 /* 1166 * special case: 1167 * each remaining entry 1168 * has too small (not enough) 1169 * scope, because ifa entries 1170 * are sorted by their scope 1171 * values. 1172 */ 1173 goto try_nextdev; 1174 } 1175 break; 1176 } else if (minihiscore < miniscore) { 1177 struct ipv6_saddr_score *tmp; 1178 1179 if (hiscore->ifa) 1180 in6_ifa_put(hiscore->ifa); 1181 1182 in6_ifa_hold(score->ifa); 1183 1184 tmp = hiscore; 1185 hiscore = score; 1186 score = tmp; 1187 1188 /* restore our iterator */ 1189 score->ifa = hiscore->ifa; 1190 1191 break; 1192 } 1193 } 1194 } 1195 try_nextdev: 1196 read_unlock_bh(&idev->lock); 1197 } 1198 rcu_read_unlock(); 1199 read_unlock(&dev_base_lock); 1200 1201 if (!hiscore->ifa) 1202 return -EADDRNOTAVAIL; 1203 1204 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1205 in6_ifa_put(hiscore->ifa); 1206 return 0; 1207 } 1208 1209 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1210 1211 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1212 unsigned char banned_flags) 1213 { 1214 struct inet6_dev *idev; 1215 int err = -EADDRNOTAVAIL; 1216 1217 rcu_read_lock(); 1218 if ((idev = __in6_dev_get(dev)) != NULL) { 1219 struct inet6_ifaddr *ifp; 1220 1221 read_lock_bh(&idev->lock); 1222 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1223 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1224 ipv6_addr_copy(addr, &ifp->addr); 1225 err = 0; 1226 break; 1227 } 1228 } 1229 read_unlock_bh(&idev->lock); 1230 } 1231 rcu_read_unlock(); 1232 return err; 1233 } 1234 1235 static int ipv6_count_addresses(struct inet6_dev *idev) 1236 { 1237 int cnt = 0; 1238 struct inet6_ifaddr *ifp; 1239 1240 read_lock_bh(&idev->lock); 1241 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1242 cnt++; 1243 read_unlock_bh(&idev->lock); 1244 return cnt; 1245 } 1246 1247 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1248 struct net_device *dev, int strict) 1249 { 1250 struct inet6_ifaddr * ifp; 1251 u8 hash = ipv6_addr_hash(addr); 1252 1253 read_lock_bh(&addrconf_hash_lock); 1254 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1255 if (!net_eq(dev_net(ifp->idev->dev), net)) 1256 continue; 1257 if (ipv6_addr_equal(&ifp->addr, addr) && 1258 !(ifp->flags&IFA_F_TENTATIVE)) { 1259 if (dev == NULL || ifp->idev->dev == dev || 1260 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1261 break; 1262 } 1263 } 1264 read_unlock_bh(&addrconf_hash_lock); 1265 return ifp != NULL; 1266 } 1267 EXPORT_SYMBOL(ipv6_chk_addr); 1268 1269 static 1270 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1271 struct net_device *dev) 1272 { 1273 struct inet6_ifaddr * ifp; 1274 u8 hash = ipv6_addr_hash(addr); 1275 1276 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1277 if (!net_eq(dev_net(ifp->idev->dev), net)) 1278 continue; 1279 if (ipv6_addr_equal(&ifp->addr, addr)) { 1280 if (dev == NULL || ifp->idev->dev == dev) 1281 break; 1282 } 1283 } 1284 return ifp != NULL; 1285 } 1286 1287 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1288 { 1289 struct inet6_dev *idev; 1290 struct inet6_ifaddr *ifa; 1291 int onlink; 1292 1293 onlink = 0; 1294 rcu_read_lock(); 1295 idev = __in6_dev_get(dev); 1296 if (idev) { 1297 read_lock_bh(&idev->lock); 1298 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1299 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1300 ifa->prefix_len); 1301 if (onlink) 1302 break; 1303 } 1304 read_unlock_bh(&idev->lock); 1305 } 1306 rcu_read_unlock(); 1307 return onlink; 1308 } 1309 1310 EXPORT_SYMBOL(ipv6_chk_prefix); 1311 1312 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1313 struct net_device *dev, int strict) 1314 { 1315 struct inet6_ifaddr * ifp; 1316 u8 hash = ipv6_addr_hash(addr); 1317 1318 read_lock_bh(&addrconf_hash_lock); 1319 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1320 if (!net_eq(dev_net(ifp->idev->dev), net)) 1321 continue; 1322 if (ipv6_addr_equal(&ifp->addr, addr)) { 1323 if (dev == NULL || ifp->idev->dev == dev || 1324 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1325 in6_ifa_hold(ifp); 1326 break; 1327 } 1328 } 1329 } 1330 read_unlock_bh(&addrconf_hash_lock); 1331 1332 return ifp; 1333 } 1334 1335 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1336 { 1337 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1338 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1339 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1340 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1341 int sk_ipv6only = ipv6_only_sock(sk); 1342 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1343 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1344 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1345 1346 if (!sk2_rcv_saddr && !sk_ipv6only) 1347 return 1; 1348 1349 if (addr_type2 == IPV6_ADDR_ANY && 1350 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1351 return 1; 1352 1353 if (addr_type == IPV6_ADDR_ANY && 1354 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1355 return 1; 1356 1357 if (sk2_rcv_saddr6 && 1358 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1359 return 1; 1360 1361 if (addr_type == IPV6_ADDR_MAPPED && 1362 !sk2_ipv6only && 1363 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1364 return 1; 1365 1366 return 0; 1367 } 1368 1369 /* Gets referenced address, destroys ifaddr */ 1370 1371 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1372 { 1373 if (ifp->flags&IFA_F_PERMANENT) { 1374 spin_lock_bh(&ifp->lock); 1375 addrconf_del_timer(ifp); 1376 ifp->flags |= IFA_F_TENTATIVE; 1377 spin_unlock_bh(&ifp->lock); 1378 in6_ifa_put(ifp); 1379 #ifdef CONFIG_IPV6_PRIVACY 1380 } else if (ifp->flags&IFA_F_TEMPORARY) { 1381 struct inet6_ifaddr *ifpub; 1382 spin_lock_bh(&ifp->lock); 1383 ifpub = ifp->ifpub; 1384 if (ifpub) { 1385 in6_ifa_hold(ifpub); 1386 spin_unlock_bh(&ifp->lock); 1387 ipv6_create_tempaddr(ifpub, ifp); 1388 in6_ifa_put(ifpub); 1389 } else { 1390 spin_unlock_bh(&ifp->lock); 1391 } 1392 ipv6_del_addr(ifp); 1393 #endif 1394 } else 1395 ipv6_del_addr(ifp); 1396 } 1397 1398 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1399 { 1400 if (net_ratelimit()) 1401 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1402 addrconf_dad_stop(ifp); 1403 } 1404 1405 /* Join to solicited addr multicast group. */ 1406 1407 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1408 { 1409 struct in6_addr maddr; 1410 1411 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1412 return; 1413 1414 addrconf_addr_solict_mult(addr, &maddr); 1415 ipv6_dev_mc_inc(dev, &maddr); 1416 } 1417 1418 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1419 { 1420 struct in6_addr maddr; 1421 1422 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1423 return; 1424 1425 addrconf_addr_solict_mult(addr, &maddr); 1426 __ipv6_dev_mc_dec(idev, &maddr); 1427 } 1428 1429 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1430 { 1431 struct in6_addr addr; 1432 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1433 if (ipv6_addr_any(&addr)) 1434 return; 1435 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1436 } 1437 1438 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1439 { 1440 struct in6_addr addr; 1441 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1442 if (ipv6_addr_any(&addr)) 1443 return; 1444 __ipv6_dev_ac_dec(ifp->idev, &addr); 1445 } 1446 1447 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1448 { 1449 if (dev->addr_len != ETH_ALEN) 1450 return -1; 1451 memcpy(eui, dev->dev_addr, 3); 1452 memcpy(eui + 5, dev->dev_addr + 3, 3); 1453 1454 /* 1455 * The zSeries OSA network cards can be shared among various 1456 * OS instances, but the OSA cards have only one MAC address. 1457 * This leads to duplicate address conflicts in conjunction 1458 * with IPv6 if more than one instance uses the same card. 1459 * 1460 * The driver for these cards can deliver a unique 16-bit 1461 * identifier for each instance sharing the same card. It is 1462 * placed instead of 0xFFFE in the interface identifier. The 1463 * "u" bit of the interface identifier is not inverted in this 1464 * case. Hence the resulting interface identifier has local 1465 * scope according to RFC2373. 1466 */ 1467 if (dev->dev_id) { 1468 eui[3] = (dev->dev_id >> 8) & 0xFF; 1469 eui[4] = dev->dev_id & 0xFF; 1470 } else { 1471 eui[3] = 0xFF; 1472 eui[4] = 0xFE; 1473 eui[0] ^= 2; 1474 } 1475 return 0; 1476 } 1477 1478 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1479 { 1480 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1481 if (dev->addr_len != ARCNET_ALEN) 1482 return -1; 1483 memset(eui, 0, 7); 1484 eui[7] = *(u8*)dev->dev_addr; 1485 return 0; 1486 } 1487 1488 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1489 { 1490 if (dev->addr_len != INFINIBAND_ALEN) 1491 return -1; 1492 memcpy(eui, dev->dev_addr + 12, 8); 1493 eui[0] |= 2; 1494 return 0; 1495 } 1496 1497 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1498 { 1499 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1500 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1501 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1502 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1503 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1504 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1505 eui[1] = 0; 1506 eui[2] = 0x5E; 1507 eui[3] = 0xFE; 1508 memcpy(eui + 4, &addr, 4); 1509 return 0; 1510 } 1511 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1512 1513 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1514 { 1515 if (dev->priv_flags & IFF_ISATAP) 1516 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1517 return -1; 1518 } 1519 1520 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1521 { 1522 switch (dev->type) { 1523 case ARPHRD_ETHER: 1524 case ARPHRD_FDDI: 1525 case ARPHRD_IEEE802_TR: 1526 return addrconf_ifid_eui48(eui, dev); 1527 case ARPHRD_ARCNET: 1528 return addrconf_ifid_arcnet(eui, dev); 1529 case ARPHRD_INFINIBAND: 1530 return addrconf_ifid_infiniband(eui, dev); 1531 case ARPHRD_SIT: 1532 return addrconf_ifid_sit(eui, dev); 1533 } 1534 return -1; 1535 } 1536 1537 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1538 { 1539 int err = -1; 1540 struct inet6_ifaddr *ifp; 1541 1542 read_lock_bh(&idev->lock); 1543 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1544 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1545 memcpy(eui, ifp->addr.s6_addr+8, 8); 1546 err = 0; 1547 break; 1548 } 1549 } 1550 read_unlock_bh(&idev->lock); 1551 return err; 1552 } 1553 1554 #ifdef CONFIG_IPV6_PRIVACY 1555 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1556 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1557 { 1558 regen: 1559 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1560 idev->rndid[0] &= ~0x02; 1561 1562 /* 1563 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1564 * check if generated address is not inappropriate 1565 * 1566 * - Reserved subnet anycast (RFC 2526) 1567 * 11111101 11....11 1xxxxxxx 1568 * - ISATAP (RFC4214) 6.1 1569 * 00-00-5E-FE-xx-xx-xx-xx 1570 * - value 0 1571 * - XXX: already assigned to an address on the device 1572 */ 1573 if (idev->rndid[0] == 0xfd && 1574 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1575 (idev->rndid[7]&0x80)) 1576 goto regen; 1577 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1578 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1579 goto regen; 1580 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1581 goto regen; 1582 } 1583 1584 return 0; 1585 } 1586 1587 static void ipv6_regen_rndid(unsigned long data) 1588 { 1589 struct inet6_dev *idev = (struct inet6_dev *) data; 1590 unsigned long expires; 1591 1592 rcu_read_lock_bh(); 1593 write_lock_bh(&idev->lock); 1594 1595 if (idev->dead) 1596 goto out; 1597 1598 if (__ipv6_regen_rndid(idev) < 0) 1599 goto out; 1600 1601 expires = jiffies + 1602 idev->cnf.temp_prefered_lft * HZ - 1603 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1604 if (time_before(expires, jiffies)) { 1605 printk(KERN_WARNING 1606 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1607 idev->dev->name); 1608 goto out; 1609 } 1610 1611 if (!mod_timer(&idev->regen_timer, expires)) 1612 in6_dev_hold(idev); 1613 1614 out: 1615 write_unlock_bh(&idev->lock); 1616 rcu_read_unlock_bh(); 1617 in6_dev_put(idev); 1618 } 1619 1620 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1621 int ret = 0; 1622 1623 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1624 ret = __ipv6_regen_rndid(idev); 1625 return ret; 1626 } 1627 #endif 1628 1629 /* 1630 * Add prefix route. 1631 */ 1632 1633 static void 1634 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1635 unsigned long expires, u32 flags) 1636 { 1637 struct fib6_config cfg = { 1638 .fc_table = RT6_TABLE_PREFIX, 1639 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1640 .fc_ifindex = dev->ifindex, 1641 .fc_expires = expires, 1642 .fc_dst_len = plen, 1643 .fc_flags = RTF_UP | flags, 1644 .fc_nlinfo.nl_net = dev_net(dev), 1645 }; 1646 1647 ipv6_addr_copy(&cfg.fc_dst, pfx); 1648 1649 /* Prevent useless cloning on PtP SIT. 1650 This thing is done here expecting that the whole 1651 class of non-broadcast devices need not cloning. 1652 */ 1653 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1654 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1655 cfg.fc_flags |= RTF_NONEXTHOP; 1656 #endif 1657 1658 ip6_route_add(&cfg); 1659 } 1660 1661 /* Create "default" multicast route to the interface */ 1662 1663 static void addrconf_add_mroute(struct net_device *dev) 1664 { 1665 struct fib6_config cfg = { 1666 .fc_table = RT6_TABLE_LOCAL, 1667 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1668 .fc_ifindex = dev->ifindex, 1669 .fc_dst_len = 8, 1670 .fc_flags = RTF_UP, 1671 .fc_nlinfo.nl_net = dev_net(dev), 1672 }; 1673 1674 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1675 1676 ip6_route_add(&cfg); 1677 } 1678 1679 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1680 static void sit_route_add(struct net_device *dev) 1681 { 1682 struct fib6_config cfg = { 1683 .fc_table = RT6_TABLE_MAIN, 1684 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1685 .fc_ifindex = dev->ifindex, 1686 .fc_dst_len = 96, 1687 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1688 .fc_nlinfo.nl_net = dev_net(dev), 1689 }; 1690 1691 /* prefix length - 96 bits "::d.d.d.d" */ 1692 ip6_route_add(&cfg); 1693 } 1694 #endif 1695 1696 static void addrconf_add_lroute(struct net_device *dev) 1697 { 1698 struct in6_addr addr; 1699 1700 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1701 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1702 } 1703 1704 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1705 { 1706 struct inet6_dev *idev; 1707 1708 ASSERT_RTNL(); 1709 1710 if ((idev = ipv6_find_idev(dev)) == NULL) 1711 return NULL; 1712 1713 /* Add default multicast route */ 1714 addrconf_add_mroute(dev); 1715 1716 /* Add link local route */ 1717 addrconf_add_lroute(dev); 1718 return idev; 1719 } 1720 1721 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1722 { 1723 struct prefix_info *pinfo; 1724 __u32 valid_lft; 1725 __u32 prefered_lft; 1726 int addr_type; 1727 unsigned long rt_expires; 1728 struct inet6_dev *in6_dev; 1729 1730 pinfo = (struct prefix_info *) opt; 1731 1732 if (len < sizeof(struct prefix_info)) { 1733 ADBG(("addrconf: prefix option too short\n")); 1734 return; 1735 } 1736 1737 /* 1738 * Validation checks ([ADDRCONF], page 19) 1739 */ 1740 1741 addr_type = ipv6_addr_type(&pinfo->prefix); 1742 1743 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1744 return; 1745 1746 valid_lft = ntohl(pinfo->valid); 1747 prefered_lft = ntohl(pinfo->prefered); 1748 1749 if (prefered_lft > valid_lft) { 1750 if (net_ratelimit()) 1751 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1752 return; 1753 } 1754 1755 in6_dev = in6_dev_get(dev); 1756 1757 if (in6_dev == NULL) { 1758 if (net_ratelimit()) 1759 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1760 return; 1761 } 1762 1763 /* 1764 * Two things going on here: 1765 * 1) Add routes for on-link prefixes 1766 * 2) Configure prefixes with the auto flag set 1767 */ 1768 1769 /* Avoid arithmetic overflow. Really, we could 1770 save rt_expires in seconds, likely valid_lft, 1771 but it would require division in fib gc, that it 1772 not good. 1773 */ 1774 if (valid_lft >= 0x7FFFFFFF/HZ) 1775 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1776 else 1777 rt_expires = valid_lft * HZ; 1778 1779 /* 1780 * We convert this (in jiffies) to clock_t later. 1781 * Avoid arithmetic overflow there as well. 1782 * Overflow can happen only if HZ < USER_HZ. 1783 */ 1784 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1785 rt_expires = 0x7FFFFFFF / USER_HZ; 1786 1787 if (pinfo->onlink) { 1788 struct rt6_info *rt; 1789 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL, 1790 dev->ifindex, 1); 1791 1792 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1793 if (rt->rt6i_flags&RTF_EXPIRES) { 1794 if (valid_lft == 0) { 1795 ip6_del_rt(rt); 1796 rt = NULL; 1797 } else { 1798 rt->rt6i_expires = jiffies + rt_expires; 1799 } 1800 } 1801 } else if (valid_lft) { 1802 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1803 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1804 } 1805 if (rt) 1806 dst_release(&rt->u.dst); 1807 } 1808 1809 /* Try to figure out our local address for this prefix */ 1810 1811 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1812 struct inet6_ifaddr * ifp; 1813 struct in6_addr addr; 1814 int create = 0, update_lft = 0; 1815 1816 if (pinfo->prefix_len == 64) { 1817 memcpy(&addr, &pinfo->prefix, 8); 1818 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1819 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1820 in6_dev_put(in6_dev); 1821 return; 1822 } 1823 goto ok; 1824 } 1825 if (net_ratelimit()) 1826 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1827 pinfo->prefix_len); 1828 in6_dev_put(in6_dev); 1829 return; 1830 1831 ok: 1832 1833 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1); 1834 1835 if (ifp == NULL && valid_lft) { 1836 int max_addresses = in6_dev->cnf.max_addresses; 1837 u32 addr_flags = 0; 1838 1839 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1840 if (in6_dev->cnf.optimistic_dad && 1841 !ipv6_devconf.forwarding) 1842 addr_flags = IFA_F_OPTIMISTIC; 1843 #endif 1844 1845 /* Do not allow to create too much of autoconfigured 1846 * addresses; this would be too easy way to crash kernel. 1847 */ 1848 if (!max_addresses || 1849 ipv6_count_addresses(in6_dev) < max_addresses) 1850 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1851 addr_type&IPV6_ADDR_SCOPE_MASK, 1852 addr_flags); 1853 1854 if (!ifp || IS_ERR(ifp)) { 1855 in6_dev_put(in6_dev); 1856 return; 1857 } 1858 1859 update_lft = create = 1; 1860 ifp->cstamp = jiffies; 1861 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1862 } 1863 1864 if (ifp) { 1865 int flags; 1866 unsigned long now; 1867 #ifdef CONFIG_IPV6_PRIVACY 1868 struct inet6_ifaddr *ift; 1869 #endif 1870 u32 stored_lft; 1871 1872 /* update lifetime (RFC2462 5.5.3 e) */ 1873 spin_lock(&ifp->lock); 1874 now = jiffies; 1875 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1876 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1877 else 1878 stored_lft = 0; 1879 if (!update_lft && stored_lft) { 1880 if (valid_lft > MIN_VALID_LIFETIME || 1881 valid_lft > stored_lft) 1882 update_lft = 1; 1883 else if (stored_lft <= MIN_VALID_LIFETIME) { 1884 /* valid_lft <= stored_lft is always true */ 1885 /* XXX: IPsec */ 1886 update_lft = 0; 1887 } else { 1888 valid_lft = MIN_VALID_LIFETIME; 1889 if (valid_lft < prefered_lft) 1890 prefered_lft = valid_lft; 1891 update_lft = 1; 1892 } 1893 } 1894 1895 if (update_lft) { 1896 ifp->valid_lft = valid_lft; 1897 ifp->prefered_lft = prefered_lft; 1898 ifp->tstamp = now; 1899 flags = ifp->flags; 1900 ifp->flags &= ~IFA_F_DEPRECATED; 1901 spin_unlock(&ifp->lock); 1902 1903 if (!(flags&IFA_F_TENTATIVE)) 1904 ipv6_ifa_notify(0, ifp); 1905 } else 1906 spin_unlock(&ifp->lock); 1907 1908 #ifdef CONFIG_IPV6_PRIVACY 1909 read_lock_bh(&in6_dev->lock); 1910 /* update all temporary addresses in the list */ 1911 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1912 /* 1913 * When adjusting the lifetimes of an existing 1914 * temporary address, only lower the lifetimes. 1915 * Implementations must not increase the 1916 * lifetimes of an existing temporary address 1917 * when processing a Prefix Information Option. 1918 */ 1919 if (ifp != ift->ifpub) 1920 continue; 1921 1922 spin_lock(&ift->lock); 1923 flags = ift->flags; 1924 if (ift->valid_lft > valid_lft && 1925 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1926 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1927 if (ift->prefered_lft > prefered_lft && 1928 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1929 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1930 spin_unlock(&ift->lock); 1931 if (!(flags&IFA_F_TENTATIVE)) 1932 ipv6_ifa_notify(0, ift); 1933 } 1934 1935 if (create && in6_dev->cnf.use_tempaddr > 0) { 1936 /* 1937 * When a new public address is created as described in [ADDRCONF], 1938 * also create a new temporary address. 1939 */ 1940 read_unlock_bh(&in6_dev->lock); 1941 ipv6_create_tempaddr(ifp, NULL); 1942 } else { 1943 read_unlock_bh(&in6_dev->lock); 1944 } 1945 #endif 1946 in6_ifa_put(ifp); 1947 addrconf_verify(0); 1948 } 1949 } 1950 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1951 in6_dev_put(in6_dev); 1952 } 1953 1954 /* 1955 * Set destination address. 1956 * Special case for SIT interfaces where we create a new "virtual" 1957 * device. 1958 */ 1959 int addrconf_set_dstaddr(struct net *net, void __user *arg) 1960 { 1961 struct in6_ifreq ireq; 1962 struct net_device *dev; 1963 int err = -EINVAL; 1964 1965 rtnl_lock(); 1966 1967 err = -EFAULT; 1968 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1969 goto err_exit; 1970 1971 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 1972 1973 err = -ENODEV; 1974 if (dev == NULL) 1975 goto err_exit; 1976 1977 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1978 if (dev->type == ARPHRD_SIT) { 1979 struct ifreq ifr; 1980 mm_segment_t oldfs; 1981 struct ip_tunnel_parm p; 1982 1983 err = -EADDRNOTAVAIL; 1984 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1985 goto err_exit; 1986 1987 memset(&p, 0, sizeof(p)); 1988 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1989 p.iph.saddr = 0; 1990 p.iph.version = 4; 1991 p.iph.ihl = 5; 1992 p.iph.protocol = IPPROTO_IPV6; 1993 p.iph.ttl = 64; 1994 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 1995 1996 oldfs = get_fs(); set_fs(KERNEL_DS); 1997 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1998 set_fs(oldfs); 1999 2000 if (err == 0) { 2001 err = -ENOBUFS; 2002 dev = __dev_get_by_name(net, p.name); 2003 if (!dev) 2004 goto err_exit; 2005 err = dev_open(dev); 2006 } 2007 } 2008 #endif 2009 2010 err_exit: 2011 rtnl_unlock(); 2012 return err; 2013 } 2014 2015 /* 2016 * Manual configuration of address on an interface 2017 */ 2018 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2019 int plen, __u8 ifa_flags, __u32 prefered_lft, 2020 __u32 valid_lft) 2021 { 2022 struct inet6_ifaddr *ifp; 2023 struct inet6_dev *idev; 2024 struct net_device *dev; 2025 int scope; 2026 u32 flags = RTF_EXPIRES; 2027 2028 ASSERT_RTNL(); 2029 2030 /* check the lifetime */ 2031 if (!valid_lft || prefered_lft > valid_lft) 2032 return -EINVAL; 2033 2034 dev = __dev_get_by_index(net, ifindex); 2035 if (!dev) 2036 return -ENODEV; 2037 2038 if ((idev = addrconf_add_dev(dev)) == NULL) 2039 return -ENOBUFS; 2040 2041 scope = ipv6_addr_scope(pfx); 2042 2043 if (valid_lft == INFINITY_LIFE_TIME) { 2044 ifa_flags |= IFA_F_PERMANENT; 2045 flags = 0; 2046 } else if (valid_lft >= 0x7FFFFFFF/HZ) 2047 valid_lft = 0x7FFFFFFF/HZ; 2048 2049 if (prefered_lft == 0) 2050 ifa_flags |= IFA_F_DEPRECATED; 2051 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 2052 (prefered_lft != INFINITY_LIFE_TIME)) 2053 prefered_lft = 0x7FFFFFFF/HZ; 2054 2055 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2056 2057 if (!IS_ERR(ifp)) { 2058 spin_lock_bh(&ifp->lock); 2059 ifp->valid_lft = valid_lft; 2060 ifp->prefered_lft = prefered_lft; 2061 ifp->tstamp = jiffies; 2062 spin_unlock_bh(&ifp->lock); 2063 2064 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2065 jiffies_to_clock_t(valid_lft * HZ), flags); 2066 /* 2067 * Note that section 3.1 of RFC 4429 indicates 2068 * that the Optimistic flag should not be set for 2069 * manually configured addresses 2070 */ 2071 addrconf_dad_start(ifp, 0); 2072 in6_ifa_put(ifp); 2073 addrconf_verify(0); 2074 return 0; 2075 } 2076 2077 return PTR_ERR(ifp); 2078 } 2079 2080 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2081 int plen) 2082 { 2083 struct inet6_ifaddr *ifp; 2084 struct inet6_dev *idev; 2085 struct net_device *dev; 2086 2087 dev = __dev_get_by_index(net, ifindex); 2088 if (!dev) 2089 return -ENODEV; 2090 2091 if ((idev = __in6_dev_get(dev)) == NULL) 2092 return -ENXIO; 2093 2094 read_lock_bh(&idev->lock); 2095 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2096 if (ifp->prefix_len == plen && 2097 ipv6_addr_equal(pfx, &ifp->addr)) { 2098 in6_ifa_hold(ifp); 2099 read_unlock_bh(&idev->lock); 2100 2101 ipv6_del_addr(ifp); 2102 2103 /* If the last address is deleted administratively, 2104 disable IPv6 on this interface. 2105 */ 2106 if (idev->addr_list == NULL) 2107 addrconf_ifdown(idev->dev, 1); 2108 return 0; 2109 } 2110 } 2111 read_unlock_bh(&idev->lock); 2112 return -EADDRNOTAVAIL; 2113 } 2114 2115 2116 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2117 { 2118 struct in6_ifreq ireq; 2119 int err; 2120 2121 if (!capable(CAP_NET_ADMIN)) 2122 return -EPERM; 2123 2124 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2125 return -EFAULT; 2126 2127 rtnl_lock(); 2128 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2129 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2130 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2131 rtnl_unlock(); 2132 return err; 2133 } 2134 2135 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2136 { 2137 struct in6_ifreq ireq; 2138 int err; 2139 2140 if (!capable(CAP_NET_ADMIN)) 2141 return -EPERM; 2142 2143 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2144 return -EFAULT; 2145 2146 rtnl_lock(); 2147 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2148 ireq.ifr6_prefixlen); 2149 rtnl_unlock(); 2150 return err; 2151 } 2152 2153 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2154 static void sit_add_v4_addrs(struct inet6_dev *idev) 2155 { 2156 struct inet6_ifaddr * ifp; 2157 struct in6_addr addr; 2158 struct net_device *dev; 2159 struct net *net = dev_net(idev->dev); 2160 int scope; 2161 2162 ASSERT_RTNL(); 2163 2164 memset(&addr, 0, sizeof(struct in6_addr)); 2165 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2166 2167 if (idev->dev->flags&IFF_POINTOPOINT) { 2168 addr.s6_addr32[0] = htonl(0xfe800000); 2169 scope = IFA_LINK; 2170 } else { 2171 scope = IPV6_ADDR_COMPATv4; 2172 } 2173 2174 if (addr.s6_addr32[3]) { 2175 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2176 if (!IS_ERR(ifp)) { 2177 spin_lock_bh(&ifp->lock); 2178 ifp->flags &= ~IFA_F_TENTATIVE; 2179 spin_unlock_bh(&ifp->lock); 2180 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2181 in6_ifa_put(ifp); 2182 } 2183 return; 2184 } 2185 2186 for_each_netdev(net, dev) { 2187 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2188 if (in_dev && (dev->flags & IFF_UP)) { 2189 struct in_ifaddr * ifa; 2190 2191 int flag = scope; 2192 2193 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2194 int plen; 2195 2196 addr.s6_addr32[3] = ifa->ifa_local; 2197 2198 if (ifa->ifa_scope == RT_SCOPE_LINK) 2199 continue; 2200 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2201 if (idev->dev->flags&IFF_POINTOPOINT) 2202 continue; 2203 flag |= IFA_HOST; 2204 } 2205 if (idev->dev->flags&IFF_POINTOPOINT) 2206 plen = 64; 2207 else 2208 plen = 96; 2209 2210 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2211 IFA_F_PERMANENT); 2212 if (!IS_ERR(ifp)) { 2213 spin_lock_bh(&ifp->lock); 2214 ifp->flags &= ~IFA_F_TENTATIVE; 2215 spin_unlock_bh(&ifp->lock); 2216 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2217 in6_ifa_put(ifp); 2218 } 2219 } 2220 } 2221 } 2222 } 2223 #endif 2224 2225 static void init_loopback(struct net_device *dev) 2226 { 2227 struct inet6_dev *idev; 2228 struct inet6_ifaddr * ifp; 2229 2230 /* ::1 */ 2231 2232 ASSERT_RTNL(); 2233 2234 if ((idev = ipv6_find_idev(dev)) == NULL) { 2235 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2236 return; 2237 } 2238 2239 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2240 if (!IS_ERR(ifp)) { 2241 spin_lock_bh(&ifp->lock); 2242 ifp->flags &= ~IFA_F_TENTATIVE; 2243 spin_unlock_bh(&ifp->lock); 2244 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2245 in6_ifa_put(ifp); 2246 } 2247 } 2248 2249 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2250 { 2251 struct inet6_ifaddr * ifp; 2252 u32 addr_flags = IFA_F_PERMANENT; 2253 2254 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2255 if (idev->cnf.optimistic_dad && 2256 !ipv6_devconf.forwarding) 2257 addr_flags |= IFA_F_OPTIMISTIC; 2258 #endif 2259 2260 2261 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2262 if (!IS_ERR(ifp)) { 2263 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2264 addrconf_dad_start(ifp, 0); 2265 in6_ifa_put(ifp); 2266 } 2267 } 2268 2269 static void addrconf_dev_config(struct net_device *dev) 2270 { 2271 struct in6_addr addr; 2272 struct inet6_dev * idev; 2273 2274 ASSERT_RTNL(); 2275 2276 if ((dev->type != ARPHRD_ETHER) && 2277 (dev->type != ARPHRD_FDDI) && 2278 (dev->type != ARPHRD_IEEE802_TR) && 2279 (dev->type != ARPHRD_ARCNET) && 2280 (dev->type != ARPHRD_INFINIBAND)) { 2281 /* Alas, we support only Ethernet autoconfiguration. */ 2282 return; 2283 } 2284 2285 idev = addrconf_add_dev(dev); 2286 if (idev == NULL) 2287 return; 2288 2289 memset(&addr, 0, sizeof(struct in6_addr)); 2290 addr.s6_addr32[0] = htonl(0xFE800000); 2291 2292 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2293 addrconf_add_linklocal(idev, &addr); 2294 } 2295 2296 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2297 static void addrconf_sit_config(struct net_device *dev) 2298 { 2299 struct inet6_dev *idev; 2300 2301 ASSERT_RTNL(); 2302 2303 /* 2304 * Configure the tunnel with one of our IPv4 2305 * addresses... we should configure all of 2306 * our v4 addrs in the tunnel 2307 */ 2308 2309 if ((idev = ipv6_find_idev(dev)) == NULL) { 2310 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2311 return; 2312 } 2313 2314 if (dev->priv_flags & IFF_ISATAP) { 2315 struct in6_addr addr; 2316 2317 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2318 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2319 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2320 addrconf_add_linklocal(idev, &addr); 2321 return; 2322 } 2323 2324 sit_add_v4_addrs(idev); 2325 2326 if (dev->flags&IFF_POINTOPOINT) { 2327 addrconf_add_mroute(dev); 2328 addrconf_add_lroute(dev); 2329 } else 2330 sit_route_add(dev); 2331 } 2332 #endif 2333 2334 static inline int 2335 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2336 { 2337 struct in6_addr lladdr; 2338 2339 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2340 addrconf_add_linklocal(idev, &lladdr); 2341 return 0; 2342 } 2343 return -1; 2344 } 2345 2346 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2347 { 2348 struct net_device *link_dev; 2349 struct net *net = dev_net(idev->dev); 2350 2351 /* first try to inherit the link-local address from the link device */ 2352 if (idev->dev->iflink && 2353 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2354 if (!ipv6_inherit_linklocal(idev, link_dev)) 2355 return; 2356 } 2357 /* then try to inherit it from any device */ 2358 for_each_netdev(net, link_dev) { 2359 if (!ipv6_inherit_linklocal(idev, link_dev)) 2360 return; 2361 } 2362 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2363 } 2364 2365 /* 2366 * Autoconfigure tunnel with a link-local address so routing protocols, 2367 * DHCPv6, MLD etc. can be run over the virtual link 2368 */ 2369 2370 static void addrconf_ip6_tnl_config(struct net_device *dev) 2371 { 2372 struct inet6_dev *idev; 2373 2374 ASSERT_RTNL(); 2375 2376 if ((idev = addrconf_add_dev(dev)) == NULL) { 2377 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2378 return; 2379 } 2380 ip6_tnl_add_linklocal(idev); 2381 } 2382 2383 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2384 void * data) 2385 { 2386 struct net_device *dev = (struct net_device *) data; 2387 struct inet6_dev *idev = __in6_dev_get(dev); 2388 int run_pending = 0; 2389 int err; 2390 2391 switch(event) { 2392 case NETDEV_REGISTER: 2393 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2394 idev = ipv6_add_dev(dev); 2395 if (!idev) 2396 return notifier_from_errno(-ENOMEM); 2397 } 2398 break; 2399 case NETDEV_UP: 2400 case NETDEV_CHANGE: 2401 if (dev->flags & IFF_SLAVE) 2402 break; 2403 2404 if (event == NETDEV_UP) { 2405 if (!addrconf_qdisc_ok(dev)) { 2406 /* device is not ready yet. */ 2407 printk(KERN_INFO 2408 "ADDRCONF(NETDEV_UP): %s: " 2409 "link is not ready\n", 2410 dev->name); 2411 break; 2412 } 2413 2414 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2415 idev = ipv6_add_dev(dev); 2416 2417 if (idev) 2418 idev->if_flags |= IF_READY; 2419 } else { 2420 if (!addrconf_qdisc_ok(dev)) { 2421 /* device is still not ready. */ 2422 break; 2423 } 2424 2425 if (idev) { 2426 if (idev->if_flags & IF_READY) { 2427 /* device is already configured. */ 2428 break; 2429 } 2430 idev->if_flags |= IF_READY; 2431 } 2432 2433 printk(KERN_INFO 2434 "ADDRCONF(NETDEV_CHANGE): %s: " 2435 "link becomes ready\n", 2436 dev->name); 2437 2438 run_pending = 1; 2439 } 2440 2441 switch(dev->type) { 2442 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2443 case ARPHRD_SIT: 2444 addrconf_sit_config(dev); 2445 break; 2446 #endif 2447 case ARPHRD_TUNNEL6: 2448 addrconf_ip6_tnl_config(dev); 2449 break; 2450 case ARPHRD_LOOPBACK: 2451 init_loopback(dev); 2452 break; 2453 2454 default: 2455 addrconf_dev_config(dev); 2456 break; 2457 } 2458 if (idev) { 2459 if (run_pending) 2460 addrconf_dad_run(idev); 2461 2462 /* If the MTU changed during the interface down, when the 2463 interface up, the changed MTU must be reflected in the 2464 idev as well as routers. 2465 */ 2466 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2467 rt6_mtu_change(dev, dev->mtu); 2468 idev->cnf.mtu6 = dev->mtu; 2469 } 2470 idev->tstamp = jiffies; 2471 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2472 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2473 stop IPv6 on this interface. 2474 */ 2475 if (dev->mtu < IPV6_MIN_MTU) 2476 addrconf_ifdown(dev, event != NETDEV_DOWN); 2477 } 2478 break; 2479 2480 case NETDEV_CHANGEMTU: 2481 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2482 rt6_mtu_change(dev, dev->mtu); 2483 idev->cnf.mtu6 = dev->mtu; 2484 break; 2485 } 2486 2487 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2488 idev = ipv6_add_dev(dev); 2489 if (idev) 2490 break; 2491 } 2492 2493 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2494 2495 case NETDEV_DOWN: 2496 case NETDEV_UNREGISTER: 2497 /* 2498 * Remove all addresses from this interface. 2499 */ 2500 addrconf_ifdown(dev, event != NETDEV_DOWN); 2501 break; 2502 2503 case NETDEV_CHANGENAME: 2504 if (idev) { 2505 snmp6_unregister_dev(idev); 2506 addrconf_sysctl_unregister(idev); 2507 addrconf_sysctl_register(idev); 2508 err = snmp6_register_dev(idev); 2509 if (err) 2510 return notifier_from_errno(err); 2511 } 2512 break; 2513 } 2514 2515 return NOTIFY_OK; 2516 } 2517 2518 /* 2519 * addrconf module should be notified of a device going up 2520 */ 2521 static struct notifier_block ipv6_dev_notf = { 2522 .notifier_call = addrconf_notify, 2523 .priority = 0 2524 }; 2525 2526 static int addrconf_ifdown(struct net_device *dev, int how) 2527 { 2528 struct inet6_dev *idev; 2529 struct inet6_ifaddr *ifa, **bifa; 2530 struct net *net = dev_net(dev); 2531 int i; 2532 2533 ASSERT_RTNL(); 2534 2535 if (dev == init_net.loopback_dev && how == 1) 2536 how = 0; 2537 2538 rt6_ifdown(net, dev); 2539 neigh_ifdown(&nd_tbl, dev); 2540 2541 idev = __in6_dev_get(dev); 2542 if (idev == NULL) 2543 return -ENODEV; 2544 2545 /* Step 1: remove reference to ipv6 device from parent device. 2546 Do not dev_put! 2547 */ 2548 if (how == 1) { 2549 idev->dead = 1; 2550 2551 /* protected by rtnl_lock */ 2552 rcu_assign_pointer(dev->ip6_ptr, NULL); 2553 2554 /* Step 1.5: remove snmp6 entry */ 2555 snmp6_unregister_dev(idev); 2556 2557 } 2558 2559 /* Step 2: clear hash table */ 2560 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2561 bifa = &inet6_addr_lst[i]; 2562 2563 write_lock_bh(&addrconf_hash_lock); 2564 while ((ifa = *bifa) != NULL) { 2565 if (ifa->idev == idev) { 2566 *bifa = ifa->lst_next; 2567 ifa->lst_next = NULL; 2568 addrconf_del_timer(ifa); 2569 in6_ifa_put(ifa); 2570 continue; 2571 } 2572 bifa = &ifa->lst_next; 2573 } 2574 write_unlock_bh(&addrconf_hash_lock); 2575 } 2576 2577 write_lock_bh(&idev->lock); 2578 2579 /* Step 3: clear flags for stateless addrconf */ 2580 if (how != 1) 2581 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2582 2583 /* Step 4: clear address list */ 2584 #ifdef CONFIG_IPV6_PRIVACY 2585 if (how == 1 && del_timer(&idev->regen_timer)) 2586 in6_dev_put(idev); 2587 2588 /* clear tempaddr list */ 2589 while ((ifa = idev->tempaddr_list) != NULL) { 2590 idev->tempaddr_list = ifa->tmp_next; 2591 ifa->tmp_next = NULL; 2592 ifa->dead = 1; 2593 write_unlock_bh(&idev->lock); 2594 spin_lock_bh(&ifa->lock); 2595 2596 if (ifa->ifpub) { 2597 in6_ifa_put(ifa->ifpub); 2598 ifa->ifpub = NULL; 2599 } 2600 spin_unlock_bh(&ifa->lock); 2601 in6_ifa_put(ifa); 2602 write_lock_bh(&idev->lock); 2603 } 2604 #endif 2605 while ((ifa = idev->addr_list) != NULL) { 2606 idev->addr_list = ifa->if_next; 2607 ifa->if_next = NULL; 2608 ifa->dead = 1; 2609 addrconf_del_timer(ifa); 2610 write_unlock_bh(&idev->lock); 2611 2612 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2613 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2614 in6_ifa_put(ifa); 2615 2616 write_lock_bh(&idev->lock); 2617 } 2618 write_unlock_bh(&idev->lock); 2619 2620 /* Step 5: Discard multicast list */ 2621 2622 if (how == 1) 2623 ipv6_mc_destroy_dev(idev); 2624 else 2625 ipv6_mc_down(idev); 2626 2627 idev->tstamp = jiffies; 2628 2629 /* Shot the device (if unregistered) */ 2630 2631 if (how == 1) { 2632 addrconf_sysctl_unregister(idev); 2633 neigh_parms_release(&nd_tbl, idev->nd_parms); 2634 neigh_ifdown(&nd_tbl, dev); 2635 in6_dev_put(idev); 2636 } 2637 return 0; 2638 } 2639 2640 static void addrconf_rs_timer(unsigned long data) 2641 { 2642 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2643 2644 if (ifp->idev->cnf.forwarding) 2645 goto out; 2646 2647 if (ifp->idev->if_flags & IF_RA_RCVD) { 2648 /* 2649 * Announcement received after solicitation 2650 * was sent 2651 */ 2652 goto out; 2653 } 2654 2655 spin_lock(&ifp->lock); 2656 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2657 struct in6_addr all_routers; 2658 2659 /* The wait after the last probe can be shorter */ 2660 addrconf_mod_timer(ifp, AC_RS, 2661 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2662 ifp->idev->cnf.rtr_solicit_delay : 2663 ifp->idev->cnf.rtr_solicit_interval); 2664 spin_unlock(&ifp->lock); 2665 2666 ipv6_addr_all_routers(&all_routers); 2667 2668 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2669 } else { 2670 spin_unlock(&ifp->lock); 2671 /* 2672 * Note: we do not support deprecated "all on-link" 2673 * assumption any longer. 2674 */ 2675 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2676 ifp->idev->dev->name); 2677 } 2678 2679 out: 2680 in6_ifa_put(ifp); 2681 } 2682 2683 /* 2684 * Duplicate Address Detection 2685 */ 2686 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2687 { 2688 unsigned long rand_num; 2689 struct inet6_dev *idev = ifp->idev; 2690 2691 if (ifp->flags & IFA_F_OPTIMISTIC) 2692 rand_num = 0; 2693 else 2694 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2695 2696 ifp->probes = idev->cnf.dad_transmits; 2697 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2698 } 2699 2700 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2701 { 2702 struct inet6_dev *idev = ifp->idev; 2703 struct net_device *dev = idev->dev; 2704 2705 addrconf_join_solict(dev, &ifp->addr); 2706 2707 net_srandom(ifp->addr.s6_addr32[3]); 2708 2709 read_lock_bh(&idev->lock); 2710 if (ifp->dead) 2711 goto out; 2712 spin_lock_bh(&ifp->lock); 2713 2714 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2715 !(ifp->flags&IFA_F_TENTATIVE) || 2716 ifp->flags & IFA_F_NODAD) { 2717 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2718 spin_unlock_bh(&ifp->lock); 2719 read_unlock_bh(&idev->lock); 2720 2721 addrconf_dad_completed(ifp); 2722 return; 2723 } 2724 2725 if (!(idev->if_flags & IF_READY)) { 2726 spin_unlock_bh(&ifp->lock); 2727 read_unlock_bh(&idev->lock); 2728 /* 2729 * If the defice is not ready: 2730 * - keep it tentative if it is a permanent address. 2731 * - otherwise, kill it. 2732 */ 2733 in6_ifa_hold(ifp); 2734 addrconf_dad_stop(ifp); 2735 return; 2736 } 2737 2738 /* 2739 * Optimistic nodes can start receiving 2740 * Frames right away 2741 */ 2742 if(ifp->flags & IFA_F_OPTIMISTIC) 2743 ip6_ins_rt(ifp->rt); 2744 2745 addrconf_dad_kick(ifp); 2746 spin_unlock_bh(&ifp->lock); 2747 out: 2748 read_unlock_bh(&idev->lock); 2749 } 2750 2751 static void addrconf_dad_timer(unsigned long data) 2752 { 2753 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2754 struct inet6_dev *idev = ifp->idev; 2755 struct in6_addr unspec; 2756 struct in6_addr mcaddr; 2757 2758 read_lock_bh(&idev->lock); 2759 if (idev->dead) { 2760 read_unlock_bh(&idev->lock); 2761 goto out; 2762 } 2763 spin_lock_bh(&ifp->lock); 2764 if (ifp->probes == 0) { 2765 /* 2766 * DAD was successful 2767 */ 2768 2769 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2770 spin_unlock_bh(&ifp->lock); 2771 read_unlock_bh(&idev->lock); 2772 2773 addrconf_dad_completed(ifp); 2774 2775 goto out; 2776 } 2777 2778 ifp->probes--; 2779 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2780 spin_unlock_bh(&ifp->lock); 2781 read_unlock_bh(&idev->lock); 2782 2783 /* send a neighbour solicitation for our addr */ 2784 memset(&unspec, 0, sizeof(unspec)); 2785 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2786 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2787 out: 2788 in6_ifa_put(ifp); 2789 } 2790 2791 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2792 { 2793 struct net_device * dev = ifp->idev->dev; 2794 2795 /* 2796 * Configure the address for reception. Now it is valid. 2797 */ 2798 2799 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2800 2801 /* If added prefix is link local and forwarding is off, 2802 start sending router solicitations. 2803 */ 2804 2805 if (ifp->idev->cnf.forwarding == 0 && 2806 ifp->idev->cnf.rtr_solicits > 0 && 2807 (dev->flags&IFF_LOOPBACK) == 0 && 2808 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2809 struct in6_addr all_routers; 2810 2811 ipv6_addr_all_routers(&all_routers); 2812 2813 /* 2814 * If a host as already performed a random delay 2815 * [...] as part of DAD [...] there is no need 2816 * to delay again before sending the first RS 2817 */ 2818 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2819 2820 spin_lock_bh(&ifp->lock); 2821 ifp->probes = 1; 2822 ifp->idev->if_flags |= IF_RS_SENT; 2823 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2824 spin_unlock_bh(&ifp->lock); 2825 } 2826 } 2827 2828 static void addrconf_dad_run(struct inet6_dev *idev) { 2829 struct inet6_ifaddr *ifp; 2830 2831 read_lock_bh(&idev->lock); 2832 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2833 spin_lock_bh(&ifp->lock); 2834 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2835 spin_unlock_bh(&ifp->lock); 2836 continue; 2837 } 2838 spin_unlock_bh(&ifp->lock); 2839 addrconf_dad_kick(ifp); 2840 } 2841 read_unlock_bh(&idev->lock); 2842 } 2843 2844 #ifdef CONFIG_PROC_FS 2845 struct if6_iter_state { 2846 struct seq_net_private p; 2847 int bucket; 2848 }; 2849 2850 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2851 { 2852 struct inet6_ifaddr *ifa = NULL; 2853 struct if6_iter_state *state = seq->private; 2854 struct net *net = seq_file_net(seq); 2855 2856 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2857 ifa = inet6_addr_lst[state->bucket]; 2858 2859 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2860 ifa = ifa->lst_next; 2861 if (ifa) 2862 break; 2863 } 2864 return ifa; 2865 } 2866 2867 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2868 { 2869 struct if6_iter_state *state = seq->private; 2870 struct net *net = seq_file_net(seq); 2871 2872 ifa = ifa->lst_next; 2873 try_again: 2874 if (ifa) { 2875 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2876 ifa = ifa->lst_next; 2877 goto try_again; 2878 } 2879 } 2880 2881 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2882 ifa = inet6_addr_lst[state->bucket]; 2883 goto try_again; 2884 } 2885 2886 return ifa; 2887 } 2888 2889 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2890 { 2891 struct inet6_ifaddr *ifa = if6_get_first(seq); 2892 2893 if (ifa) 2894 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2895 --pos; 2896 return pos ? NULL : ifa; 2897 } 2898 2899 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2900 __acquires(addrconf_hash_lock) 2901 { 2902 read_lock_bh(&addrconf_hash_lock); 2903 return if6_get_idx(seq, *pos); 2904 } 2905 2906 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2907 { 2908 struct inet6_ifaddr *ifa; 2909 2910 ifa = if6_get_next(seq, v); 2911 ++*pos; 2912 return ifa; 2913 } 2914 2915 static void if6_seq_stop(struct seq_file *seq, void *v) 2916 __releases(addrconf_hash_lock) 2917 { 2918 read_unlock_bh(&addrconf_hash_lock); 2919 } 2920 2921 static int if6_seq_show(struct seq_file *seq, void *v) 2922 { 2923 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2924 seq_printf(seq, 2925 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2926 NIP6(ifp->addr), 2927 ifp->idev->dev->ifindex, 2928 ifp->prefix_len, 2929 ifp->scope, 2930 ifp->flags, 2931 ifp->idev->dev->name); 2932 return 0; 2933 } 2934 2935 static const struct seq_operations if6_seq_ops = { 2936 .start = if6_seq_start, 2937 .next = if6_seq_next, 2938 .show = if6_seq_show, 2939 .stop = if6_seq_stop, 2940 }; 2941 2942 static int if6_seq_open(struct inode *inode, struct file *file) 2943 { 2944 return seq_open_net(inode, file, &if6_seq_ops, 2945 sizeof(struct if6_iter_state)); 2946 } 2947 2948 static const struct file_operations if6_fops = { 2949 .owner = THIS_MODULE, 2950 .open = if6_seq_open, 2951 .read = seq_read, 2952 .llseek = seq_lseek, 2953 .release = seq_release_net, 2954 }; 2955 2956 static int if6_proc_net_init(struct net *net) 2957 { 2958 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 2959 return -ENOMEM; 2960 return 0; 2961 } 2962 2963 static void if6_proc_net_exit(struct net *net) 2964 { 2965 proc_net_remove(net, "if_inet6"); 2966 } 2967 2968 static struct pernet_operations if6_proc_net_ops = { 2969 .init = if6_proc_net_init, 2970 .exit = if6_proc_net_exit, 2971 }; 2972 2973 int __init if6_proc_init(void) 2974 { 2975 return register_pernet_subsys(&if6_proc_net_ops); 2976 } 2977 2978 void if6_proc_exit(void) 2979 { 2980 unregister_pernet_subsys(&if6_proc_net_ops); 2981 } 2982 #endif /* CONFIG_PROC_FS */ 2983 2984 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 2985 /* Check if address is a home address configured on any interface. */ 2986 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 2987 { 2988 int ret = 0; 2989 struct inet6_ifaddr * ifp; 2990 u8 hash = ipv6_addr_hash(addr); 2991 read_lock_bh(&addrconf_hash_lock); 2992 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2993 if (!net_eq(dev_net(ifp->idev->dev), net)) 2994 continue; 2995 if (ipv6_addr_equal(&ifp->addr, addr) && 2996 (ifp->flags & IFA_F_HOMEADDRESS)) { 2997 ret = 1; 2998 break; 2999 } 3000 } 3001 read_unlock_bh(&addrconf_hash_lock); 3002 return ret; 3003 } 3004 #endif 3005 3006 /* 3007 * Periodic address status verification 3008 */ 3009 3010 static void addrconf_verify(unsigned long foo) 3011 { 3012 struct inet6_ifaddr *ifp; 3013 unsigned long now, next; 3014 int i; 3015 3016 spin_lock_bh(&addrconf_verify_lock); 3017 now = jiffies; 3018 next = now + ADDR_CHECK_FREQUENCY; 3019 3020 del_timer(&addr_chk_timer); 3021 3022 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3023 3024 restart: 3025 read_lock(&addrconf_hash_lock); 3026 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3027 unsigned long age; 3028 #ifdef CONFIG_IPV6_PRIVACY 3029 unsigned long regen_advance; 3030 #endif 3031 3032 if (ifp->flags & IFA_F_PERMANENT) 3033 continue; 3034 3035 spin_lock(&ifp->lock); 3036 age = (now - ifp->tstamp) / HZ; 3037 3038 #ifdef CONFIG_IPV6_PRIVACY 3039 regen_advance = ifp->idev->cnf.regen_max_retry * 3040 ifp->idev->cnf.dad_transmits * 3041 ifp->idev->nd_parms->retrans_time / HZ; 3042 #endif 3043 3044 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3045 age >= ifp->valid_lft) { 3046 spin_unlock(&ifp->lock); 3047 in6_ifa_hold(ifp); 3048 read_unlock(&addrconf_hash_lock); 3049 ipv6_del_addr(ifp); 3050 goto restart; 3051 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3052 spin_unlock(&ifp->lock); 3053 continue; 3054 } else if (age >= ifp->prefered_lft) { 3055 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 3056 int deprecate = 0; 3057 3058 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3059 deprecate = 1; 3060 ifp->flags |= IFA_F_DEPRECATED; 3061 } 3062 3063 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3064 next = ifp->tstamp + ifp->valid_lft * HZ; 3065 3066 spin_unlock(&ifp->lock); 3067 3068 if (deprecate) { 3069 in6_ifa_hold(ifp); 3070 read_unlock(&addrconf_hash_lock); 3071 3072 ipv6_ifa_notify(0, ifp); 3073 in6_ifa_put(ifp); 3074 goto restart; 3075 } 3076 #ifdef CONFIG_IPV6_PRIVACY 3077 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3078 !(ifp->flags&IFA_F_TENTATIVE)) { 3079 if (age >= ifp->prefered_lft - regen_advance) { 3080 struct inet6_ifaddr *ifpub = ifp->ifpub; 3081 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3082 next = ifp->tstamp + ifp->prefered_lft * HZ; 3083 if (!ifp->regen_count && ifpub) { 3084 ifp->regen_count++; 3085 in6_ifa_hold(ifp); 3086 in6_ifa_hold(ifpub); 3087 spin_unlock(&ifp->lock); 3088 read_unlock(&addrconf_hash_lock); 3089 spin_lock(&ifpub->lock); 3090 ifpub->regen_count = 0; 3091 spin_unlock(&ifpub->lock); 3092 ipv6_create_tempaddr(ifpub, ifp); 3093 in6_ifa_put(ifpub); 3094 in6_ifa_put(ifp); 3095 goto restart; 3096 } 3097 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3098 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3099 spin_unlock(&ifp->lock); 3100 #endif 3101 } else { 3102 /* ifp->prefered_lft <= ifp->valid_lft */ 3103 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3104 next = ifp->tstamp + ifp->prefered_lft * HZ; 3105 spin_unlock(&ifp->lock); 3106 } 3107 } 3108 read_unlock(&addrconf_hash_lock); 3109 } 3110 3111 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3112 add_timer(&addr_chk_timer); 3113 spin_unlock_bh(&addrconf_verify_lock); 3114 } 3115 3116 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3117 { 3118 struct in6_addr *pfx = NULL; 3119 3120 if (addr) 3121 pfx = nla_data(addr); 3122 3123 if (local) { 3124 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3125 pfx = NULL; 3126 else 3127 pfx = nla_data(local); 3128 } 3129 3130 return pfx; 3131 } 3132 3133 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3134 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3135 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3136 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3137 }; 3138 3139 static int 3140 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3141 { 3142 struct net *net = sock_net(skb->sk); 3143 struct ifaddrmsg *ifm; 3144 struct nlattr *tb[IFA_MAX+1]; 3145 struct in6_addr *pfx; 3146 int err; 3147 3148 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3149 if (err < 0) 3150 return err; 3151 3152 ifm = nlmsg_data(nlh); 3153 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3154 if (pfx == NULL) 3155 return -EINVAL; 3156 3157 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3158 } 3159 3160 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3161 u32 prefered_lft, u32 valid_lft) 3162 { 3163 u32 flags = RTF_EXPIRES; 3164 3165 if (!valid_lft || (prefered_lft > valid_lft)) 3166 return -EINVAL; 3167 3168 if (valid_lft == INFINITY_LIFE_TIME) { 3169 ifa_flags |= IFA_F_PERMANENT; 3170 flags = 0; 3171 } else if (valid_lft >= 0x7FFFFFFF/HZ) 3172 valid_lft = 0x7FFFFFFF/HZ; 3173 3174 if (prefered_lft == 0) 3175 ifa_flags |= IFA_F_DEPRECATED; 3176 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 3177 (prefered_lft != INFINITY_LIFE_TIME)) 3178 prefered_lft = 0x7FFFFFFF/HZ; 3179 3180 spin_lock_bh(&ifp->lock); 3181 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3182 ifp->tstamp = jiffies; 3183 ifp->valid_lft = valid_lft; 3184 ifp->prefered_lft = prefered_lft; 3185 3186 spin_unlock_bh(&ifp->lock); 3187 if (!(ifp->flags&IFA_F_TENTATIVE)) 3188 ipv6_ifa_notify(0, ifp); 3189 3190 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3191 jiffies_to_clock_t(valid_lft * HZ), flags); 3192 addrconf_verify(0); 3193 3194 return 0; 3195 } 3196 3197 static int 3198 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3199 { 3200 struct net *net = sock_net(skb->sk); 3201 struct ifaddrmsg *ifm; 3202 struct nlattr *tb[IFA_MAX+1]; 3203 struct in6_addr *pfx; 3204 struct inet6_ifaddr *ifa; 3205 struct net_device *dev; 3206 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3207 u8 ifa_flags; 3208 int err; 3209 3210 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3211 if (err < 0) 3212 return err; 3213 3214 ifm = nlmsg_data(nlh); 3215 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3216 if (pfx == NULL) 3217 return -EINVAL; 3218 3219 if (tb[IFA_CACHEINFO]) { 3220 struct ifa_cacheinfo *ci; 3221 3222 ci = nla_data(tb[IFA_CACHEINFO]); 3223 valid_lft = ci->ifa_valid; 3224 preferred_lft = ci->ifa_prefered; 3225 } else { 3226 preferred_lft = INFINITY_LIFE_TIME; 3227 valid_lft = INFINITY_LIFE_TIME; 3228 } 3229 3230 dev = __dev_get_by_index(net, ifm->ifa_index); 3231 if (dev == NULL) 3232 return -ENODEV; 3233 3234 /* We ignore other flags so far. */ 3235 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3236 3237 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3238 if (ifa == NULL) { 3239 /* 3240 * It would be best to check for !NLM_F_CREATE here but 3241 * userspace alreay relies on not having to provide this. 3242 */ 3243 return inet6_addr_add(net, ifm->ifa_index, pfx, 3244 ifm->ifa_prefixlen, ifa_flags, 3245 preferred_lft, valid_lft); 3246 } 3247 3248 if (nlh->nlmsg_flags & NLM_F_EXCL || 3249 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3250 err = -EEXIST; 3251 else 3252 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3253 3254 in6_ifa_put(ifa); 3255 3256 return err; 3257 } 3258 3259 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3260 u8 scope, int ifindex) 3261 { 3262 struct ifaddrmsg *ifm; 3263 3264 ifm = nlmsg_data(nlh); 3265 ifm->ifa_family = AF_INET6; 3266 ifm->ifa_prefixlen = prefixlen; 3267 ifm->ifa_flags = flags; 3268 ifm->ifa_scope = scope; 3269 ifm->ifa_index = ifindex; 3270 } 3271 3272 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3273 unsigned long tstamp, u32 preferred, u32 valid) 3274 { 3275 struct ifa_cacheinfo ci; 3276 3277 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3278 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3279 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3280 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3281 ci.ifa_prefered = preferred; 3282 ci.ifa_valid = valid; 3283 3284 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3285 } 3286 3287 static inline int rt_scope(int ifa_scope) 3288 { 3289 if (ifa_scope & IFA_HOST) 3290 return RT_SCOPE_HOST; 3291 else if (ifa_scope & IFA_LINK) 3292 return RT_SCOPE_LINK; 3293 else if (ifa_scope & IFA_SITE) 3294 return RT_SCOPE_SITE; 3295 else 3296 return RT_SCOPE_UNIVERSE; 3297 } 3298 3299 static inline int inet6_ifaddr_msgsize(void) 3300 { 3301 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3302 + nla_total_size(16) /* IFA_ADDRESS */ 3303 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3304 } 3305 3306 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3307 u32 pid, u32 seq, int event, unsigned int flags) 3308 { 3309 struct nlmsghdr *nlh; 3310 u32 preferred, valid; 3311 3312 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3313 if (nlh == NULL) 3314 return -EMSGSIZE; 3315 3316 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3317 ifa->idev->dev->ifindex); 3318 3319 if (!(ifa->flags&IFA_F_PERMANENT)) { 3320 preferred = ifa->prefered_lft; 3321 valid = ifa->valid_lft; 3322 if (preferred != INFINITY_LIFE_TIME) { 3323 long tval = (jiffies - ifa->tstamp)/HZ; 3324 preferred -= tval; 3325 if (valid != INFINITY_LIFE_TIME) 3326 valid -= tval; 3327 } 3328 } else { 3329 preferred = INFINITY_LIFE_TIME; 3330 valid = INFINITY_LIFE_TIME; 3331 } 3332 3333 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3334 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3335 nlmsg_cancel(skb, nlh); 3336 return -EMSGSIZE; 3337 } 3338 3339 return nlmsg_end(skb, nlh); 3340 } 3341 3342 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3343 u32 pid, u32 seq, int event, u16 flags) 3344 { 3345 struct nlmsghdr *nlh; 3346 u8 scope = RT_SCOPE_UNIVERSE; 3347 int ifindex = ifmca->idev->dev->ifindex; 3348 3349 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3350 scope = RT_SCOPE_SITE; 3351 3352 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3353 if (nlh == NULL) 3354 return -EMSGSIZE; 3355 3356 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3357 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3358 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3359 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3360 nlmsg_cancel(skb, nlh); 3361 return -EMSGSIZE; 3362 } 3363 3364 return nlmsg_end(skb, nlh); 3365 } 3366 3367 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3368 u32 pid, u32 seq, int event, unsigned int flags) 3369 { 3370 struct nlmsghdr *nlh; 3371 u8 scope = RT_SCOPE_UNIVERSE; 3372 int ifindex = ifaca->aca_idev->dev->ifindex; 3373 3374 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3375 scope = RT_SCOPE_SITE; 3376 3377 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3378 if (nlh == NULL) 3379 return -EMSGSIZE; 3380 3381 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3382 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3383 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3384 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3385 nlmsg_cancel(skb, nlh); 3386 return -EMSGSIZE; 3387 } 3388 3389 return nlmsg_end(skb, nlh); 3390 } 3391 3392 enum addr_type_t 3393 { 3394 UNICAST_ADDR, 3395 MULTICAST_ADDR, 3396 ANYCAST_ADDR, 3397 }; 3398 3399 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3400 enum addr_type_t type) 3401 { 3402 int idx, ip_idx; 3403 int s_idx, s_ip_idx; 3404 int err = 1; 3405 struct net_device *dev; 3406 struct inet6_dev *idev = NULL; 3407 struct inet6_ifaddr *ifa; 3408 struct ifmcaddr6 *ifmca; 3409 struct ifacaddr6 *ifaca; 3410 struct net *net = sock_net(skb->sk); 3411 3412 s_idx = cb->args[0]; 3413 s_ip_idx = ip_idx = cb->args[1]; 3414 3415 idx = 0; 3416 for_each_netdev(net, dev) { 3417 if (idx < s_idx) 3418 goto cont; 3419 if (idx > s_idx) 3420 s_ip_idx = 0; 3421 ip_idx = 0; 3422 if ((idev = in6_dev_get(dev)) == NULL) 3423 goto cont; 3424 read_lock_bh(&idev->lock); 3425 switch (type) { 3426 case UNICAST_ADDR: 3427 /* unicast address incl. temp addr */ 3428 for (ifa = idev->addr_list; ifa; 3429 ifa = ifa->if_next, ip_idx++) { 3430 if (ip_idx < s_ip_idx) 3431 continue; 3432 err = inet6_fill_ifaddr(skb, ifa, 3433 NETLINK_CB(cb->skb).pid, 3434 cb->nlh->nlmsg_seq, 3435 RTM_NEWADDR, 3436 NLM_F_MULTI); 3437 } 3438 break; 3439 case MULTICAST_ADDR: 3440 /* multicast address */ 3441 for (ifmca = idev->mc_list; ifmca; 3442 ifmca = ifmca->next, ip_idx++) { 3443 if (ip_idx < s_ip_idx) 3444 continue; 3445 err = inet6_fill_ifmcaddr(skb, ifmca, 3446 NETLINK_CB(cb->skb).pid, 3447 cb->nlh->nlmsg_seq, 3448 RTM_GETMULTICAST, 3449 NLM_F_MULTI); 3450 } 3451 break; 3452 case ANYCAST_ADDR: 3453 /* anycast address */ 3454 for (ifaca = idev->ac_list; ifaca; 3455 ifaca = ifaca->aca_next, ip_idx++) { 3456 if (ip_idx < s_ip_idx) 3457 continue; 3458 err = inet6_fill_ifacaddr(skb, ifaca, 3459 NETLINK_CB(cb->skb).pid, 3460 cb->nlh->nlmsg_seq, 3461 RTM_GETANYCAST, 3462 NLM_F_MULTI); 3463 } 3464 break; 3465 default: 3466 break; 3467 } 3468 read_unlock_bh(&idev->lock); 3469 in6_dev_put(idev); 3470 3471 if (err <= 0) 3472 break; 3473 cont: 3474 idx++; 3475 } 3476 cb->args[0] = idx; 3477 cb->args[1] = ip_idx; 3478 return skb->len; 3479 } 3480 3481 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3482 { 3483 enum addr_type_t type = UNICAST_ADDR; 3484 3485 return inet6_dump_addr(skb, cb, type); 3486 } 3487 3488 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3489 { 3490 enum addr_type_t type = MULTICAST_ADDR; 3491 3492 return inet6_dump_addr(skb, cb, type); 3493 } 3494 3495 3496 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3497 { 3498 enum addr_type_t type = ANYCAST_ADDR; 3499 3500 return inet6_dump_addr(skb, cb, type); 3501 } 3502 3503 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3504 void *arg) 3505 { 3506 struct net *net = sock_net(in_skb->sk); 3507 struct ifaddrmsg *ifm; 3508 struct nlattr *tb[IFA_MAX+1]; 3509 struct in6_addr *addr = NULL; 3510 struct net_device *dev = NULL; 3511 struct inet6_ifaddr *ifa; 3512 struct sk_buff *skb; 3513 int err; 3514 3515 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3516 if (err < 0) 3517 goto errout; 3518 3519 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3520 if (addr == NULL) { 3521 err = -EINVAL; 3522 goto errout; 3523 } 3524 3525 ifm = nlmsg_data(nlh); 3526 if (ifm->ifa_index) 3527 dev = __dev_get_by_index(net, ifm->ifa_index); 3528 3529 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3530 err = -EADDRNOTAVAIL; 3531 goto errout; 3532 } 3533 3534 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3535 err = -ENOBUFS; 3536 goto errout_ifa; 3537 } 3538 3539 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3540 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3541 if (err < 0) { 3542 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3543 WARN_ON(err == -EMSGSIZE); 3544 kfree_skb(skb); 3545 goto errout_ifa; 3546 } 3547 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3548 errout_ifa: 3549 in6_ifa_put(ifa); 3550 errout: 3551 return err; 3552 } 3553 3554 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3555 { 3556 struct sk_buff *skb; 3557 struct net *net = dev_net(ifa->idev->dev); 3558 int err = -ENOBUFS; 3559 3560 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3561 if (skb == NULL) 3562 goto errout; 3563 3564 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3565 if (err < 0) { 3566 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3567 WARN_ON(err == -EMSGSIZE); 3568 kfree_skb(skb); 3569 goto errout; 3570 } 3571 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3572 errout: 3573 if (err < 0) 3574 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3575 } 3576 3577 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3578 __s32 *array, int bytes) 3579 { 3580 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3581 3582 memset(array, 0, bytes); 3583 array[DEVCONF_FORWARDING] = cnf->forwarding; 3584 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3585 array[DEVCONF_MTU6] = cnf->mtu6; 3586 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3587 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3588 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3589 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3590 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3591 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3592 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3593 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3594 #ifdef CONFIG_IPV6_PRIVACY 3595 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3596 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3597 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3598 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3599 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3600 #endif 3601 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3602 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3603 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3604 #ifdef CONFIG_IPV6_ROUTER_PREF 3605 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3606 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3607 #ifdef CONFIG_IPV6_ROUTE_INFO 3608 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3609 #endif 3610 #endif 3611 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3612 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3613 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3614 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3615 #endif 3616 #ifdef CONFIG_IPV6_MROUTE 3617 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3618 #endif 3619 } 3620 3621 static inline size_t inet6_if_nlmsg_size(void) 3622 { 3623 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3624 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3625 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3626 + nla_total_size(4) /* IFLA_MTU */ 3627 + nla_total_size(4) /* IFLA_LINK */ 3628 + nla_total_size( /* IFLA_PROTINFO */ 3629 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3630 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3631 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3632 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3633 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3634 ); 3635 } 3636 3637 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3638 int bytes) 3639 { 3640 int i; 3641 int pad = bytes - sizeof(u64) * items; 3642 BUG_ON(pad < 0); 3643 3644 /* Use put_unaligned() because stats may not be aligned for u64. */ 3645 put_unaligned(items, &stats[0]); 3646 for (i = 1; i < items; i++) 3647 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3648 3649 memset(&stats[items], 0, pad); 3650 } 3651 3652 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3653 int bytes) 3654 { 3655 switch(attrtype) { 3656 case IFLA_INET6_STATS: 3657 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3658 break; 3659 case IFLA_INET6_ICMP6STATS: 3660 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3661 break; 3662 } 3663 } 3664 3665 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3666 u32 pid, u32 seq, int event, unsigned int flags) 3667 { 3668 struct net_device *dev = idev->dev; 3669 struct nlattr *nla; 3670 struct ifinfomsg *hdr; 3671 struct nlmsghdr *nlh; 3672 void *protoinfo; 3673 struct ifla_cacheinfo ci; 3674 3675 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3676 if (nlh == NULL) 3677 return -EMSGSIZE; 3678 3679 hdr = nlmsg_data(nlh); 3680 hdr->ifi_family = AF_INET6; 3681 hdr->__ifi_pad = 0; 3682 hdr->ifi_type = dev->type; 3683 hdr->ifi_index = dev->ifindex; 3684 hdr->ifi_flags = dev_get_flags(dev); 3685 hdr->ifi_change = 0; 3686 3687 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3688 3689 if (dev->addr_len) 3690 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3691 3692 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3693 if (dev->ifindex != dev->iflink) 3694 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3695 3696 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3697 if (protoinfo == NULL) 3698 goto nla_put_failure; 3699 3700 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3701 3702 ci.max_reasm_len = IPV6_MAXPLEN; 3703 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3704 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3705 ci.reachable_time = idev->nd_parms->reachable_time; 3706 ci.retrans_time = idev->nd_parms->retrans_time; 3707 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3708 3709 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3710 if (nla == NULL) 3711 goto nla_put_failure; 3712 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3713 3714 /* XXX - MC not implemented */ 3715 3716 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3717 if (nla == NULL) 3718 goto nla_put_failure; 3719 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3720 3721 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3722 if (nla == NULL) 3723 goto nla_put_failure; 3724 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3725 3726 nla_nest_end(skb, protoinfo); 3727 return nlmsg_end(skb, nlh); 3728 3729 nla_put_failure: 3730 nlmsg_cancel(skb, nlh); 3731 return -EMSGSIZE; 3732 } 3733 3734 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3735 { 3736 struct net *net = sock_net(skb->sk); 3737 int idx, err; 3738 int s_idx = cb->args[0]; 3739 struct net_device *dev; 3740 struct inet6_dev *idev; 3741 3742 read_lock(&dev_base_lock); 3743 idx = 0; 3744 for_each_netdev(net, dev) { 3745 if (idx < s_idx) 3746 goto cont; 3747 if ((idev = in6_dev_get(dev)) == NULL) 3748 goto cont; 3749 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3750 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3751 in6_dev_put(idev); 3752 if (err <= 0) 3753 break; 3754 cont: 3755 idx++; 3756 } 3757 read_unlock(&dev_base_lock); 3758 cb->args[0] = idx; 3759 3760 return skb->len; 3761 } 3762 3763 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3764 { 3765 struct sk_buff *skb; 3766 struct net *net = dev_net(idev->dev); 3767 int err = -ENOBUFS; 3768 3769 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3770 if (skb == NULL) 3771 goto errout; 3772 3773 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3774 if (err < 0) { 3775 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3776 WARN_ON(err == -EMSGSIZE); 3777 kfree_skb(skb); 3778 goto errout; 3779 } 3780 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3781 errout: 3782 if (err < 0) 3783 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3784 } 3785 3786 static inline size_t inet6_prefix_nlmsg_size(void) 3787 { 3788 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3789 + nla_total_size(sizeof(struct in6_addr)) 3790 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3791 } 3792 3793 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3794 struct prefix_info *pinfo, u32 pid, u32 seq, 3795 int event, unsigned int flags) 3796 { 3797 struct prefixmsg *pmsg; 3798 struct nlmsghdr *nlh; 3799 struct prefix_cacheinfo ci; 3800 3801 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3802 if (nlh == NULL) 3803 return -EMSGSIZE; 3804 3805 pmsg = nlmsg_data(nlh); 3806 pmsg->prefix_family = AF_INET6; 3807 pmsg->prefix_pad1 = 0; 3808 pmsg->prefix_pad2 = 0; 3809 pmsg->prefix_ifindex = idev->dev->ifindex; 3810 pmsg->prefix_len = pinfo->prefix_len; 3811 pmsg->prefix_type = pinfo->type; 3812 pmsg->prefix_pad3 = 0; 3813 pmsg->prefix_flags = 0; 3814 if (pinfo->onlink) 3815 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3816 if (pinfo->autoconf) 3817 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3818 3819 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3820 3821 ci.preferred_time = ntohl(pinfo->prefered); 3822 ci.valid_time = ntohl(pinfo->valid); 3823 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3824 3825 return nlmsg_end(skb, nlh); 3826 3827 nla_put_failure: 3828 nlmsg_cancel(skb, nlh); 3829 return -EMSGSIZE; 3830 } 3831 3832 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3833 struct prefix_info *pinfo) 3834 { 3835 struct sk_buff *skb; 3836 struct net *net = dev_net(idev->dev); 3837 int err = -ENOBUFS; 3838 3839 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3840 if (skb == NULL) 3841 goto errout; 3842 3843 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3844 if (err < 0) { 3845 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3846 WARN_ON(err == -EMSGSIZE); 3847 kfree_skb(skb); 3848 goto errout; 3849 } 3850 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3851 errout: 3852 if (err < 0) 3853 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3854 } 3855 3856 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3857 { 3858 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3859 3860 switch (event) { 3861 case RTM_NEWADDR: 3862 /* 3863 * If the address was optimistic 3864 * we inserted the route at the start of 3865 * our DAD process, so we don't need 3866 * to do it again 3867 */ 3868 if (!(ifp->rt->rt6i_node)) 3869 ip6_ins_rt(ifp->rt); 3870 if (ifp->idev->cnf.forwarding) 3871 addrconf_join_anycast(ifp); 3872 break; 3873 case RTM_DELADDR: 3874 if (ifp->idev->cnf.forwarding) 3875 addrconf_leave_anycast(ifp); 3876 addrconf_leave_solict(ifp->idev, &ifp->addr); 3877 dst_hold(&ifp->rt->u.dst); 3878 if (ip6_del_rt(ifp->rt)) 3879 dst_free(&ifp->rt->u.dst); 3880 break; 3881 } 3882 } 3883 3884 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3885 { 3886 rcu_read_lock_bh(); 3887 if (likely(ifp->idev->dead == 0)) 3888 __ipv6_ifa_notify(event, ifp); 3889 rcu_read_unlock_bh(); 3890 } 3891 3892 #ifdef CONFIG_SYSCTL 3893 3894 static 3895 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3896 void __user *buffer, size_t *lenp, loff_t *ppos) 3897 { 3898 int *valp = ctl->data; 3899 int val = *valp; 3900 int ret; 3901 3902 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3903 3904 if (write) 3905 addrconf_fixup_forwarding(ctl, valp, val); 3906 return ret; 3907 } 3908 3909 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3910 int __user *name, int nlen, 3911 void __user *oldval, 3912 size_t __user *oldlenp, 3913 void __user *newval, size_t newlen) 3914 { 3915 int *valp = table->data; 3916 int val = *valp; 3917 int new; 3918 3919 if (!newval || !newlen) 3920 return 0; 3921 if (newlen != sizeof(int)) 3922 return -EINVAL; 3923 if (get_user(new, (int __user *)newval)) 3924 return -EFAULT; 3925 if (new == *valp) 3926 return 0; 3927 if (oldval && oldlenp) { 3928 size_t len; 3929 if (get_user(len, oldlenp)) 3930 return -EFAULT; 3931 if (len) { 3932 if (len > table->maxlen) 3933 len = table->maxlen; 3934 if (copy_to_user(oldval, valp, len)) 3935 return -EFAULT; 3936 if (put_user(len, oldlenp)) 3937 return -EFAULT; 3938 } 3939 } 3940 3941 *valp = new; 3942 addrconf_fixup_forwarding(table, valp, val); 3943 return 1; 3944 } 3945 3946 static struct addrconf_sysctl_table 3947 { 3948 struct ctl_table_header *sysctl_header; 3949 ctl_table addrconf_vars[DEVCONF_MAX+1]; 3950 char *dev_name; 3951 } addrconf_sysctl __read_mostly = { 3952 .sysctl_header = NULL, 3953 .addrconf_vars = { 3954 { 3955 .ctl_name = NET_IPV6_FORWARDING, 3956 .procname = "forwarding", 3957 .data = &ipv6_devconf.forwarding, 3958 .maxlen = sizeof(int), 3959 .mode = 0644, 3960 .proc_handler = &addrconf_sysctl_forward, 3961 .strategy = &addrconf_sysctl_forward_strategy, 3962 }, 3963 { 3964 .ctl_name = NET_IPV6_HOP_LIMIT, 3965 .procname = "hop_limit", 3966 .data = &ipv6_devconf.hop_limit, 3967 .maxlen = sizeof(int), 3968 .mode = 0644, 3969 .proc_handler = proc_dointvec, 3970 }, 3971 { 3972 .ctl_name = NET_IPV6_MTU, 3973 .procname = "mtu", 3974 .data = &ipv6_devconf.mtu6, 3975 .maxlen = sizeof(int), 3976 .mode = 0644, 3977 .proc_handler = &proc_dointvec, 3978 }, 3979 { 3980 .ctl_name = NET_IPV6_ACCEPT_RA, 3981 .procname = "accept_ra", 3982 .data = &ipv6_devconf.accept_ra, 3983 .maxlen = sizeof(int), 3984 .mode = 0644, 3985 .proc_handler = &proc_dointvec, 3986 }, 3987 { 3988 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3989 .procname = "accept_redirects", 3990 .data = &ipv6_devconf.accept_redirects, 3991 .maxlen = sizeof(int), 3992 .mode = 0644, 3993 .proc_handler = &proc_dointvec, 3994 }, 3995 { 3996 .ctl_name = NET_IPV6_AUTOCONF, 3997 .procname = "autoconf", 3998 .data = &ipv6_devconf.autoconf, 3999 .maxlen = sizeof(int), 4000 .mode = 0644, 4001 .proc_handler = &proc_dointvec, 4002 }, 4003 { 4004 .ctl_name = NET_IPV6_DAD_TRANSMITS, 4005 .procname = "dad_transmits", 4006 .data = &ipv6_devconf.dad_transmits, 4007 .maxlen = sizeof(int), 4008 .mode = 0644, 4009 .proc_handler = &proc_dointvec, 4010 }, 4011 { 4012 .ctl_name = NET_IPV6_RTR_SOLICITS, 4013 .procname = "router_solicitations", 4014 .data = &ipv6_devconf.rtr_solicits, 4015 .maxlen = sizeof(int), 4016 .mode = 0644, 4017 .proc_handler = &proc_dointvec, 4018 }, 4019 { 4020 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 4021 .procname = "router_solicitation_interval", 4022 .data = &ipv6_devconf.rtr_solicit_interval, 4023 .maxlen = sizeof(int), 4024 .mode = 0644, 4025 .proc_handler = &proc_dointvec_jiffies, 4026 .strategy = &sysctl_jiffies, 4027 }, 4028 { 4029 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 4030 .procname = "router_solicitation_delay", 4031 .data = &ipv6_devconf.rtr_solicit_delay, 4032 .maxlen = sizeof(int), 4033 .mode = 0644, 4034 .proc_handler = &proc_dointvec_jiffies, 4035 .strategy = &sysctl_jiffies, 4036 }, 4037 { 4038 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 4039 .procname = "force_mld_version", 4040 .data = &ipv6_devconf.force_mld_version, 4041 .maxlen = sizeof(int), 4042 .mode = 0644, 4043 .proc_handler = &proc_dointvec, 4044 }, 4045 #ifdef CONFIG_IPV6_PRIVACY 4046 { 4047 .ctl_name = NET_IPV6_USE_TEMPADDR, 4048 .procname = "use_tempaddr", 4049 .data = &ipv6_devconf.use_tempaddr, 4050 .maxlen = sizeof(int), 4051 .mode = 0644, 4052 .proc_handler = &proc_dointvec, 4053 }, 4054 { 4055 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 4056 .procname = "temp_valid_lft", 4057 .data = &ipv6_devconf.temp_valid_lft, 4058 .maxlen = sizeof(int), 4059 .mode = 0644, 4060 .proc_handler = &proc_dointvec, 4061 }, 4062 { 4063 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 4064 .procname = "temp_prefered_lft", 4065 .data = &ipv6_devconf.temp_prefered_lft, 4066 .maxlen = sizeof(int), 4067 .mode = 0644, 4068 .proc_handler = &proc_dointvec, 4069 }, 4070 { 4071 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4072 .procname = "regen_max_retry", 4073 .data = &ipv6_devconf.regen_max_retry, 4074 .maxlen = sizeof(int), 4075 .mode = 0644, 4076 .proc_handler = &proc_dointvec, 4077 }, 4078 { 4079 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4080 .procname = "max_desync_factor", 4081 .data = &ipv6_devconf.max_desync_factor, 4082 .maxlen = sizeof(int), 4083 .mode = 0644, 4084 .proc_handler = &proc_dointvec, 4085 }, 4086 #endif 4087 { 4088 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4089 .procname = "max_addresses", 4090 .data = &ipv6_devconf.max_addresses, 4091 .maxlen = sizeof(int), 4092 .mode = 0644, 4093 .proc_handler = &proc_dointvec, 4094 }, 4095 { 4096 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4097 .procname = "accept_ra_defrtr", 4098 .data = &ipv6_devconf.accept_ra_defrtr, 4099 .maxlen = sizeof(int), 4100 .mode = 0644, 4101 .proc_handler = &proc_dointvec, 4102 }, 4103 { 4104 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4105 .procname = "accept_ra_pinfo", 4106 .data = &ipv6_devconf.accept_ra_pinfo, 4107 .maxlen = sizeof(int), 4108 .mode = 0644, 4109 .proc_handler = &proc_dointvec, 4110 }, 4111 #ifdef CONFIG_IPV6_ROUTER_PREF 4112 { 4113 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4114 .procname = "accept_ra_rtr_pref", 4115 .data = &ipv6_devconf.accept_ra_rtr_pref, 4116 .maxlen = sizeof(int), 4117 .mode = 0644, 4118 .proc_handler = &proc_dointvec, 4119 }, 4120 { 4121 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4122 .procname = "router_probe_interval", 4123 .data = &ipv6_devconf.rtr_probe_interval, 4124 .maxlen = sizeof(int), 4125 .mode = 0644, 4126 .proc_handler = &proc_dointvec_jiffies, 4127 .strategy = &sysctl_jiffies, 4128 }, 4129 #ifdef CONFIG_IPV6_ROUTE_INFO 4130 { 4131 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4132 .procname = "accept_ra_rt_info_max_plen", 4133 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4134 .maxlen = sizeof(int), 4135 .mode = 0644, 4136 .proc_handler = &proc_dointvec, 4137 }, 4138 #endif 4139 #endif 4140 { 4141 .ctl_name = NET_IPV6_PROXY_NDP, 4142 .procname = "proxy_ndp", 4143 .data = &ipv6_devconf.proxy_ndp, 4144 .maxlen = sizeof(int), 4145 .mode = 0644, 4146 .proc_handler = &proc_dointvec, 4147 }, 4148 { 4149 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4150 .procname = "accept_source_route", 4151 .data = &ipv6_devconf.accept_source_route, 4152 .maxlen = sizeof(int), 4153 .mode = 0644, 4154 .proc_handler = &proc_dointvec, 4155 }, 4156 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4157 { 4158 .ctl_name = CTL_UNNUMBERED, 4159 .procname = "optimistic_dad", 4160 .data = &ipv6_devconf.optimistic_dad, 4161 .maxlen = sizeof(int), 4162 .mode = 0644, 4163 .proc_handler = &proc_dointvec, 4164 4165 }, 4166 #endif 4167 #ifdef CONFIG_IPV6_MROUTE 4168 { 4169 .ctl_name = CTL_UNNUMBERED, 4170 .procname = "mc_forwarding", 4171 .data = &ipv6_devconf.mc_forwarding, 4172 .maxlen = sizeof(int), 4173 .mode = 0644, 4174 .proc_handler = &proc_dointvec, 4175 }, 4176 #endif 4177 { 4178 .ctl_name = 0, /* sentinel */ 4179 } 4180 }, 4181 }; 4182 4183 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4184 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4185 { 4186 int i; 4187 struct addrconf_sysctl_table *t; 4188 4189 #define ADDRCONF_CTL_PATH_DEV 3 4190 4191 struct ctl_path addrconf_ctl_path[] = { 4192 { .procname = "net", .ctl_name = CTL_NET, }, 4193 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4194 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4195 { /* to be set */ }, 4196 { }, 4197 }; 4198 4199 4200 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4201 if (t == NULL) 4202 goto out; 4203 4204 for (i=0; t->addrconf_vars[i].data; i++) { 4205 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4206 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4207 t->addrconf_vars[i].extra2 = net; 4208 } 4209 4210 /* 4211 * Make a copy of dev_name, because '.procname' is regarded as const 4212 * by sysctl and we wouldn't want anyone to change it under our feet 4213 * (see SIOCSIFNAME). 4214 */ 4215 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4216 if (!t->dev_name) 4217 goto free; 4218 4219 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4220 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4221 4222 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4223 t->addrconf_vars); 4224 if (t->sysctl_header == NULL) 4225 goto free_procname; 4226 4227 p->sysctl = t; 4228 return 0; 4229 4230 free_procname: 4231 kfree(t->dev_name); 4232 free: 4233 kfree(t); 4234 out: 4235 return -ENOBUFS; 4236 } 4237 4238 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4239 { 4240 struct addrconf_sysctl_table *t; 4241 4242 if (p->sysctl == NULL) 4243 return; 4244 4245 t = p->sysctl; 4246 p->sysctl = NULL; 4247 unregister_sysctl_table(t->sysctl_header); 4248 kfree(t->dev_name); 4249 kfree(t); 4250 } 4251 4252 static void addrconf_sysctl_register(struct inet6_dev *idev) 4253 { 4254 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4255 NET_IPV6_NEIGH, "ipv6", 4256 &ndisc_ifinfo_sysctl_change, 4257 NULL); 4258 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4259 idev->dev->ifindex, idev, &idev->cnf); 4260 } 4261 4262 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4263 { 4264 __addrconf_sysctl_unregister(&idev->cnf); 4265 neigh_sysctl_unregister(idev->nd_parms); 4266 } 4267 4268 4269 #endif 4270 4271 static int addrconf_init_net(struct net *net) 4272 { 4273 int err; 4274 struct ipv6_devconf *all, *dflt; 4275 4276 err = -ENOMEM; 4277 all = &ipv6_devconf; 4278 dflt = &ipv6_devconf_dflt; 4279 4280 if (net != &init_net) { 4281 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4282 if (all == NULL) 4283 goto err_alloc_all; 4284 4285 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4286 if (dflt == NULL) 4287 goto err_alloc_dflt; 4288 } 4289 4290 net->ipv6.devconf_all = all; 4291 net->ipv6.devconf_dflt = dflt; 4292 4293 #ifdef CONFIG_SYSCTL 4294 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4295 NULL, all); 4296 if (err < 0) 4297 goto err_reg_all; 4298 4299 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4300 NULL, dflt); 4301 if (err < 0) 4302 goto err_reg_dflt; 4303 #endif 4304 return 0; 4305 4306 #ifdef CONFIG_SYSCTL 4307 err_reg_dflt: 4308 __addrconf_sysctl_unregister(all); 4309 err_reg_all: 4310 kfree(dflt); 4311 #endif 4312 err_alloc_dflt: 4313 kfree(all); 4314 err_alloc_all: 4315 return err; 4316 } 4317 4318 static void addrconf_exit_net(struct net *net) 4319 { 4320 #ifdef CONFIG_SYSCTL 4321 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4322 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4323 #endif 4324 if (net != &init_net) { 4325 kfree(net->ipv6.devconf_dflt); 4326 kfree(net->ipv6.devconf_all); 4327 } 4328 } 4329 4330 static struct pernet_operations addrconf_ops = { 4331 .init = addrconf_init_net, 4332 .exit = addrconf_exit_net, 4333 }; 4334 4335 /* 4336 * Device notifier 4337 */ 4338 4339 int register_inet6addr_notifier(struct notifier_block *nb) 4340 { 4341 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4342 } 4343 4344 EXPORT_SYMBOL(register_inet6addr_notifier); 4345 4346 int unregister_inet6addr_notifier(struct notifier_block *nb) 4347 { 4348 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4349 } 4350 4351 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4352 4353 4354 static int addrconf_net_init(struct net *net) 4355 { 4356 return 0; 4357 } 4358 4359 static void addrconf_net_exit(struct net *net) 4360 { 4361 struct net_device *dev; 4362 4363 rtnl_lock(); 4364 /* clean dev list */ 4365 for_each_netdev(net, dev) { 4366 if (__in6_dev_get(dev) == NULL) 4367 continue; 4368 addrconf_ifdown(dev, 1); 4369 } 4370 addrconf_ifdown(net->loopback_dev, 2); 4371 rtnl_unlock(); 4372 } 4373 4374 static struct pernet_operations addrconf_net_ops = { 4375 .init = addrconf_net_init, 4376 .exit = addrconf_net_exit, 4377 }; 4378 4379 /* 4380 * Init / cleanup code 4381 */ 4382 4383 int __init addrconf_init(void) 4384 { 4385 int err; 4386 4387 if ((err = ipv6_addr_label_init()) < 0) { 4388 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4389 err); 4390 return err; 4391 } 4392 4393 register_pernet_subsys(&addrconf_ops); 4394 4395 /* The addrconf netdev notifier requires that loopback_dev 4396 * has it's ipv6 private information allocated and setup 4397 * before it can bring up and give link-local addresses 4398 * to other devices which are up. 4399 * 4400 * Unfortunately, loopback_dev is not necessarily the first 4401 * entry in the global dev_base list of net devices. In fact, 4402 * it is likely to be the very last entry on that list. 4403 * So this causes the notifier registry below to try and 4404 * give link-local addresses to all devices besides loopback_dev 4405 * first, then loopback_dev, which cases all the non-loopback_dev 4406 * devices to fail to get a link-local address. 4407 * 4408 * So, as a temporary fix, allocate the ipv6 structure for 4409 * loopback_dev first by hand. 4410 * Longer term, all of the dependencies ipv6 has upon the loopback 4411 * device and it being up should be removed. 4412 */ 4413 rtnl_lock(); 4414 if (!ipv6_add_dev(init_net.loopback_dev)) 4415 err = -ENOMEM; 4416 rtnl_unlock(); 4417 if (err) 4418 goto errlo; 4419 4420 err = register_pernet_device(&addrconf_net_ops); 4421 if (err) 4422 return err; 4423 4424 register_netdevice_notifier(&ipv6_dev_notf); 4425 4426 addrconf_verify(0); 4427 4428 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4429 if (err < 0) 4430 goto errout; 4431 4432 /* Only the first call to __rtnl_register can fail */ 4433 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4434 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4435 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4436 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4437 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4438 4439 ipv6_addr_label_rtnl_register(); 4440 4441 return 0; 4442 errout: 4443 unregister_netdevice_notifier(&ipv6_dev_notf); 4444 errlo: 4445 unregister_pernet_subsys(&addrconf_ops); 4446 4447 return err; 4448 } 4449 4450 void addrconf_cleanup(void) 4451 { 4452 struct inet6_ifaddr *ifa; 4453 int i; 4454 4455 unregister_netdevice_notifier(&ipv6_dev_notf); 4456 unregister_pernet_device(&addrconf_net_ops); 4457 4458 unregister_pernet_subsys(&addrconf_ops); 4459 4460 rtnl_lock(); 4461 4462 /* 4463 * Check hash table. 4464 */ 4465 write_lock_bh(&addrconf_hash_lock); 4466 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4467 for (ifa=inet6_addr_lst[i]; ifa; ) { 4468 struct inet6_ifaddr *bifa; 4469 4470 bifa = ifa; 4471 ifa = ifa->lst_next; 4472 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4473 /* Do not free it; something is wrong. 4474 Now we can investigate it with debugger. 4475 */ 4476 } 4477 } 4478 write_unlock_bh(&addrconf_hash_lock); 4479 4480 del_timer(&addr_chk_timer); 4481 rtnl_unlock(); 4482 4483 unregister_pernet_subsys(&addrconf_net_ops); 4484 } 4485