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 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 226 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 227 228 /* Check if a valid qdisc is available */ 229 static inline int addrconf_qdisc_ok(struct net_device *dev) 230 { 231 return (dev->qdisc != &noop_qdisc); 232 } 233 234 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 235 { 236 if (del_timer(&ifp->timer)) 237 __in6_ifa_put(ifp); 238 } 239 240 enum addrconf_timer_t 241 { 242 AC_NONE, 243 AC_DAD, 244 AC_RS, 245 }; 246 247 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 248 enum addrconf_timer_t what, 249 unsigned long when) 250 { 251 if (!del_timer(&ifp->timer)) 252 in6_ifa_hold(ifp); 253 254 switch (what) { 255 case AC_DAD: 256 ifp->timer.function = addrconf_dad_timer; 257 break; 258 case AC_RS: 259 ifp->timer.function = addrconf_rs_timer; 260 break; 261 default:; 262 } 263 ifp->timer.expires = jiffies + when; 264 add_timer(&ifp->timer); 265 } 266 267 static int snmp6_alloc_dev(struct inet6_dev *idev) 268 { 269 if (snmp_mib_init((void **)idev->stats.ipv6, 270 sizeof(struct ipstats_mib)) < 0) 271 goto err_ip; 272 if (snmp_mib_init((void **)idev->stats.icmpv6, 273 sizeof(struct icmpv6_mib)) < 0) 274 goto err_icmp; 275 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 276 sizeof(struct icmpv6msg_mib)) < 0) 277 goto err_icmpmsg; 278 279 return 0; 280 281 err_icmpmsg: 282 snmp_mib_free((void **)idev->stats.icmpv6); 283 err_icmp: 284 snmp_mib_free((void **)idev->stats.ipv6); 285 err_ip: 286 return -ENOMEM; 287 } 288 289 static void snmp6_free_dev(struct inet6_dev *idev) 290 { 291 snmp_mib_free((void **)idev->stats.icmpv6msg); 292 snmp_mib_free((void **)idev->stats.icmpv6); 293 snmp_mib_free((void **)idev->stats.ipv6); 294 } 295 296 /* Nobody refers to this device, we may destroy it. */ 297 298 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 299 { 300 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 301 kfree(idev); 302 } 303 304 void in6_dev_finish_destroy(struct inet6_dev *idev) 305 { 306 struct net_device *dev = idev->dev; 307 BUG_TRAP(idev->addr_list==NULL); 308 BUG_TRAP(idev->mc_list==NULL); 309 #ifdef NET_REFCNT_DEBUG 310 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 311 #endif 312 dev_put(dev); 313 if (!idev->dead) { 314 printk("Freeing alive inet6 device %p\n", idev); 315 return; 316 } 317 snmp6_free_dev(idev); 318 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 319 } 320 321 EXPORT_SYMBOL(in6_dev_finish_destroy); 322 323 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 324 { 325 struct inet6_dev *ndev; 326 327 ASSERT_RTNL(); 328 329 if (dev->mtu < IPV6_MIN_MTU) 330 return NULL; 331 332 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 333 334 if (ndev == NULL) 335 return NULL; 336 337 rwlock_init(&ndev->lock); 338 ndev->dev = dev; 339 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 340 ndev->cnf.mtu6 = dev->mtu; 341 ndev->cnf.sysctl = NULL; 342 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 343 if (ndev->nd_parms == NULL) { 344 kfree(ndev); 345 return NULL; 346 } 347 /* We refer to the device */ 348 dev_hold(dev); 349 350 if (snmp6_alloc_dev(ndev) < 0) { 351 ADBG((KERN_WARNING 352 "%s(): cannot allocate memory for statistics; dev=%s.\n", 353 __func__, dev->name)); 354 neigh_parms_release(&nd_tbl, ndev->nd_parms); 355 ndev->dead = 1; 356 in6_dev_finish_destroy(ndev); 357 return NULL; 358 } 359 360 if (snmp6_register_dev(ndev) < 0) { 361 ADBG((KERN_WARNING 362 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 363 __func__, dev->name)); 364 neigh_parms_release(&nd_tbl, ndev->nd_parms); 365 ndev->dead = 1; 366 in6_dev_finish_destroy(ndev); 367 return NULL; 368 } 369 370 /* One reference from device. We must do this before 371 * we invoke __ipv6_regen_rndid(). 372 */ 373 in6_dev_hold(ndev); 374 375 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 376 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 377 printk(KERN_INFO 378 "%s: Disabled Multicast RS\n", 379 dev->name); 380 ndev->cnf.rtr_solicits = 0; 381 } 382 #endif 383 384 #ifdef CONFIG_IPV6_PRIVACY 385 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 386 if ((dev->flags&IFF_LOOPBACK) || 387 dev->type == ARPHRD_TUNNEL || 388 dev->type == ARPHRD_TUNNEL6 || 389 dev->type == ARPHRD_SIT || 390 dev->type == ARPHRD_NONE) { 391 printk(KERN_INFO 392 "%s: Disabled Privacy Extensions\n", 393 dev->name); 394 ndev->cnf.use_tempaddr = -1; 395 } else { 396 in6_dev_hold(ndev); 397 ipv6_regen_rndid((unsigned long) ndev); 398 } 399 #endif 400 401 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 402 ndev->if_flags |= IF_READY; 403 404 ipv6_mc_init_dev(ndev); 405 ndev->tstamp = jiffies; 406 addrconf_sysctl_register(ndev); 407 /* protected by rtnl_lock */ 408 rcu_assign_pointer(dev->ip6_ptr, ndev); 409 410 /* Join all-node multicast group */ 411 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 412 413 return ndev; 414 } 415 416 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 417 { 418 struct inet6_dev *idev; 419 420 ASSERT_RTNL(); 421 422 if ((idev = __in6_dev_get(dev)) == NULL) { 423 if ((idev = ipv6_add_dev(dev)) == NULL) 424 return NULL; 425 } 426 427 if (dev->flags&IFF_UP) 428 ipv6_mc_up(idev); 429 return idev; 430 } 431 432 #ifdef CONFIG_SYSCTL 433 static void dev_forward_change(struct inet6_dev *idev) 434 { 435 struct net_device *dev; 436 struct inet6_ifaddr *ifa; 437 438 if (!idev) 439 return; 440 dev = idev->dev; 441 if (dev && (dev->flags & IFF_MULTICAST)) { 442 if (idev->cnf.forwarding) 443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 444 else 445 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 446 } 447 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 448 if (ifa->flags&IFA_F_TENTATIVE) 449 continue; 450 if (idev->cnf.forwarding) 451 addrconf_join_anycast(ifa); 452 else 453 addrconf_leave_anycast(ifa); 454 } 455 } 456 457 458 static void addrconf_forward_change(struct net *net, __s32 newf) 459 { 460 struct net_device *dev; 461 struct inet6_dev *idev; 462 463 read_lock(&dev_base_lock); 464 for_each_netdev(net, dev) { 465 rcu_read_lock(); 466 idev = __in6_dev_get(dev); 467 if (idev) { 468 int changed = (!idev->cnf.forwarding) ^ (!newf); 469 idev->cnf.forwarding = newf; 470 if (changed) 471 dev_forward_change(idev); 472 } 473 rcu_read_unlock(); 474 } 475 read_unlock(&dev_base_lock); 476 } 477 478 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 479 { 480 struct net *net; 481 482 net = (struct net *)table->extra2; 483 if (p == &net->ipv6.devconf_dflt->forwarding) 484 return; 485 486 if (p == &net->ipv6.devconf_all->forwarding) { 487 __s32 newf = net->ipv6.devconf_all->forwarding; 488 net->ipv6.devconf_dflt->forwarding = newf; 489 addrconf_forward_change(net, newf); 490 } else if ((!*p) ^ (!old)) 491 dev_forward_change((struct inet6_dev *)table->extra1); 492 493 if (*p) 494 rt6_purge_dflt_routers(net); 495 } 496 #endif 497 498 /* Nobody refers to this ifaddr, destroy it */ 499 500 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 501 { 502 BUG_TRAP(ifp->if_next==NULL); 503 BUG_TRAP(ifp->lst_next==NULL); 504 #ifdef NET_REFCNT_DEBUG 505 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 506 #endif 507 508 in6_dev_put(ifp->idev); 509 510 if (del_timer(&ifp->timer)) 511 printk("Timer is still running, when freeing ifa=%p\n", ifp); 512 513 if (!ifp->dead) { 514 printk("Freeing alive inet6 address %p\n", ifp); 515 return; 516 } 517 dst_release(&ifp->rt->u.dst); 518 519 kfree(ifp); 520 } 521 522 static void 523 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 524 { 525 struct inet6_ifaddr *ifa, **ifap; 526 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 527 528 /* 529 * Each device address list is sorted in order of scope - 530 * global before linklocal. 531 */ 532 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 533 ifap = &ifa->if_next) { 534 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 535 break; 536 } 537 538 ifp->if_next = *ifap; 539 *ifap = ifp; 540 } 541 542 /* 543 * Hash function taken from net_alias.c 544 */ 545 static u8 ipv6_addr_hash(const struct in6_addr *addr) 546 { 547 __u32 word; 548 549 /* 550 * We perform the hash function over the last 64 bits of the address 551 * This will include the IEEE address token on links that support it. 552 */ 553 554 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 555 word ^= (word >> 16); 556 word ^= (word >> 8); 557 558 return ((word ^ (word >> 4)) & 0x0f); 559 } 560 561 /* On success it returns ifp with increased reference count */ 562 563 static struct inet6_ifaddr * 564 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 565 int scope, u32 flags) 566 { 567 struct inet6_ifaddr *ifa = NULL; 568 struct rt6_info *rt; 569 int hash; 570 int err = 0; 571 572 rcu_read_lock_bh(); 573 if (idev->dead) { 574 err = -ENODEV; /*XXX*/ 575 goto out2; 576 } 577 578 write_lock(&addrconf_hash_lock); 579 580 /* Ignore adding duplicate addresses on an interface */ 581 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 582 ADBG(("ipv6_add_addr: already assigned\n")); 583 err = -EEXIST; 584 goto out; 585 } 586 587 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 588 589 if (ifa == NULL) { 590 ADBG(("ipv6_add_addr: malloc failed\n")); 591 err = -ENOBUFS; 592 goto out; 593 } 594 595 rt = addrconf_dst_alloc(idev, addr, 0); 596 if (IS_ERR(rt)) { 597 err = PTR_ERR(rt); 598 goto out; 599 } 600 601 ipv6_addr_copy(&ifa->addr, addr); 602 603 spin_lock_init(&ifa->lock); 604 init_timer(&ifa->timer); 605 ifa->timer.data = (unsigned long) ifa; 606 ifa->scope = scope; 607 ifa->prefix_len = pfxlen; 608 ifa->flags = flags | IFA_F_TENTATIVE; 609 ifa->cstamp = ifa->tstamp = jiffies; 610 611 ifa->rt = rt; 612 613 /* 614 * part one of RFC 4429, section 3.3 615 * We should not configure an address as 616 * optimistic if we do not yet know the link 617 * layer address of our nexhop router 618 */ 619 620 if (rt->rt6i_nexthop == NULL) 621 ifa->flags &= ~IFA_F_OPTIMISTIC; 622 623 ifa->idev = idev; 624 in6_dev_hold(idev); 625 /* For caller */ 626 in6_ifa_hold(ifa); 627 628 /* Add to big hash table */ 629 hash = ipv6_addr_hash(addr); 630 631 ifa->lst_next = inet6_addr_lst[hash]; 632 inet6_addr_lst[hash] = ifa; 633 in6_ifa_hold(ifa); 634 write_unlock(&addrconf_hash_lock); 635 636 write_lock(&idev->lock); 637 /* Add to inet6_dev unicast addr list. */ 638 ipv6_link_dev_addr(idev, ifa); 639 640 #ifdef CONFIG_IPV6_PRIVACY 641 if (ifa->flags&IFA_F_TEMPORARY) { 642 ifa->tmp_next = idev->tempaddr_list; 643 idev->tempaddr_list = ifa; 644 in6_ifa_hold(ifa); 645 } 646 #endif 647 648 in6_ifa_hold(ifa); 649 write_unlock(&idev->lock); 650 out2: 651 rcu_read_unlock_bh(); 652 653 if (likely(err == 0)) 654 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 655 else { 656 kfree(ifa); 657 ifa = ERR_PTR(err); 658 } 659 660 return ifa; 661 out: 662 write_unlock(&addrconf_hash_lock); 663 goto out2; 664 } 665 666 /* This function wants to get referenced ifp and releases it before return */ 667 668 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 669 { 670 struct inet6_ifaddr *ifa, **ifap; 671 struct inet6_dev *idev = ifp->idev; 672 int hash; 673 int deleted = 0, onlink = 0; 674 unsigned long expires = jiffies; 675 676 hash = ipv6_addr_hash(&ifp->addr); 677 678 ifp->dead = 1; 679 680 write_lock_bh(&addrconf_hash_lock); 681 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 682 ifap = &ifa->lst_next) { 683 if (ifa == ifp) { 684 *ifap = ifa->lst_next; 685 __in6_ifa_put(ifp); 686 ifa->lst_next = NULL; 687 break; 688 } 689 } 690 write_unlock_bh(&addrconf_hash_lock); 691 692 write_lock_bh(&idev->lock); 693 #ifdef CONFIG_IPV6_PRIVACY 694 if (ifp->flags&IFA_F_TEMPORARY) { 695 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 696 ifap = &ifa->tmp_next) { 697 if (ifa == ifp) { 698 *ifap = ifa->tmp_next; 699 if (ifp->ifpub) { 700 in6_ifa_put(ifp->ifpub); 701 ifp->ifpub = NULL; 702 } 703 __in6_ifa_put(ifp); 704 ifa->tmp_next = NULL; 705 break; 706 } 707 } 708 } 709 #endif 710 711 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 712 if (ifa == ifp) { 713 *ifap = ifa->if_next; 714 __in6_ifa_put(ifp); 715 ifa->if_next = NULL; 716 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 717 break; 718 deleted = 1; 719 continue; 720 } else if (ifp->flags & IFA_F_PERMANENT) { 721 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 722 ifp->prefix_len)) { 723 if (ifa->flags & IFA_F_PERMANENT) { 724 onlink = 1; 725 if (deleted) 726 break; 727 } else { 728 unsigned long lifetime; 729 730 if (!onlink) 731 onlink = -1; 732 733 spin_lock(&ifa->lock); 734 lifetime = min_t(unsigned long, 735 ifa->valid_lft, 0x7fffffffUL/HZ); 736 if (time_before(expires, 737 ifa->tstamp + lifetime * HZ)) 738 expires = ifa->tstamp + lifetime * HZ; 739 spin_unlock(&ifa->lock); 740 } 741 } 742 } 743 ifap = &ifa->if_next; 744 } 745 write_unlock_bh(&idev->lock); 746 747 ipv6_ifa_notify(RTM_DELADDR, ifp); 748 749 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 750 751 addrconf_del_timer(ifp); 752 753 /* 754 * Purge or update corresponding prefix 755 * 756 * 1) we don't purge prefix here if address was not permanent. 757 * prefix is managed by its own lifetime. 758 * 2) if there're no addresses, delete prefix. 759 * 3) if there're still other permanent address(es), 760 * corresponding prefix is still permanent. 761 * 4) otherwise, update prefix lifetime to the 762 * longest valid lifetime among the corresponding 763 * addresses on the device. 764 * Note: subsequent RA will update lifetime. 765 * 766 * --yoshfuji 767 */ 768 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 769 struct in6_addr prefix; 770 struct rt6_info *rt; 771 struct net *net = dev_net(ifp->idev->dev); 772 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 773 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 774 775 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 776 if (onlink == 0) { 777 ip6_del_rt(rt); 778 rt = NULL; 779 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 780 rt->rt6i_expires = expires; 781 rt->rt6i_flags |= RTF_EXPIRES; 782 } 783 } 784 dst_release(&rt->u.dst); 785 } 786 787 in6_ifa_put(ifp); 788 } 789 790 #ifdef CONFIG_IPV6_PRIVACY 791 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 792 { 793 struct inet6_dev *idev = ifp->idev; 794 struct in6_addr addr, *tmpaddr; 795 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 796 unsigned long regen_advance; 797 int tmp_plen; 798 int ret = 0; 799 int max_addresses; 800 u32 addr_flags; 801 802 write_lock(&idev->lock); 803 if (ift) { 804 spin_lock_bh(&ift->lock); 805 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 806 spin_unlock_bh(&ift->lock); 807 tmpaddr = &addr; 808 } else { 809 tmpaddr = NULL; 810 } 811 retry: 812 in6_dev_hold(idev); 813 if (idev->cnf.use_tempaddr <= 0) { 814 write_unlock(&idev->lock); 815 printk(KERN_INFO 816 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 817 in6_dev_put(idev); 818 ret = -1; 819 goto out; 820 } 821 spin_lock_bh(&ifp->lock); 822 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 823 idev->cnf.use_tempaddr = -1; /*XXX*/ 824 spin_unlock_bh(&ifp->lock); 825 write_unlock(&idev->lock); 826 printk(KERN_WARNING 827 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 828 in6_dev_put(idev); 829 ret = -1; 830 goto out; 831 } 832 in6_ifa_hold(ifp); 833 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 834 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 835 spin_unlock_bh(&ifp->lock); 836 write_unlock(&idev->lock); 837 printk(KERN_WARNING 838 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 839 in6_ifa_put(ifp); 840 in6_dev_put(idev); 841 ret = -1; 842 goto out; 843 } 844 memcpy(&addr.s6_addr[8], idev->rndid, 8); 845 tmp_valid_lft = min_t(__u32, 846 ifp->valid_lft, 847 idev->cnf.temp_valid_lft); 848 tmp_prefered_lft = min_t(__u32, 849 ifp->prefered_lft, 850 idev->cnf.temp_prefered_lft - desync_factor / HZ); 851 tmp_plen = ifp->prefix_len; 852 max_addresses = idev->cnf.max_addresses; 853 tmp_cstamp = ifp->cstamp; 854 tmp_tstamp = ifp->tstamp; 855 spin_unlock_bh(&ifp->lock); 856 857 regen_advance = idev->cnf.regen_max_retry * 858 idev->cnf.dad_transmits * 859 idev->nd_parms->retrans_time / HZ; 860 write_unlock(&idev->lock); 861 862 /* A temporary address is created only if this calculated Preferred 863 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 864 * an implementation must not create a temporary address with a zero 865 * Preferred Lifetime. 866 */ 867 if (tmp_prefered_lft <= regen_advance) { 868 in6_ifa_put(ifp); 869 in6_dev_put(idev); 870 ret = -1; 871 goto out; 872 } 873 874 addr_flags = IFA_F_TEMPORARY; 875 /* set in addrconf_prefix_rcv() */ 876 if (ifp->flags & IFA_F_OPTIMISTIC) 877 addr_flags |= IFA_F_OPTIMISTIC; 878 879 ift = !max_addresses || 880 ipv6_count_addresses(idev) < max_addresses ? 881 ipv6_add_addr(idev, &addr, tmp_plen, 882 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 883 addr_flags) : NULL; 884 if (!ift || IS_ERR(ift)) { 885 in6_ifa_put(ifp); 886 in6_dev_put(idev); 887 printk(KERN_INFO 888 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 889 tmpaddr = &addr; 890 write_lock(&idev->lock); 891 goto retry; 892 } 893 894 spin_lock_bh(&ift->lock); 895 ift->ifpub = ifp; 896 ift->valid_lft = tmp_valid_lft; 897 ift->prefered_lft = tmp_prefered_lft; 898 ift->cstamp = tmp_cstamp; 899 ift->tstamp = tmp_tstamp; 900 spin_unlock_bh(&ift->lock); 901 902 addrconf_dad_start(ift, 0); 903 in6_ifa_put(ift); 904 in6_dev_put(idev); 905 out: 906 return ret; 907 } 908 #endif 909 910 /* 911 * Choose an appropriate source address (RFC3484) 912 */ 913 enum { 914 IPV6_SADDR_RULE_INIT = 0, 915 IPV6_SADDR_RULE_LOCAL, 916 IPV6_SADDR_RULE_SCOPE, 917 IPV6_SADDR_RULE_PREFERRED, 918 #ifdef CONFIG_IPV6_MIP6 919 IPV6_SADDR_RULE_HOA, 920 #endif 921 IPV6_SADDR_RULE_OIF, 922 IPV6_SADDR_RULE_LABEL, 923 #ifdef CONFIG_IPV6_PRIVACY 924 IPV6_SADDR_RULE_PRIVACY, 925 #endif 926 IPV6_SADDR_RULE_ORCHID, 927 IPV6_SADDR_RULE_PREFIX, 928 IPV6_SADDR_RULE_MAX 929 }; 930 931 struct ipv6_saddr_score { 932 int rule; 933 int addr_type; 934 struct inet6_ifaddr *ifa; 935 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 936 int scopedist; 937 int matchlen; 938 }; 939 940 struct ipv6_saddr_dst { 941 const struct in6_addr *addr; 942 int ifindex; 943 int scope; 944 int label; 945 unsigned int prefs; 946 }; 947 948 static inline int ipv6_saddr_preferred(int type) 949 { 950 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 951 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 952 return 1; 953 return 0; 954 } 955 956 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score, 957 struct ipv6_saddr_dst *dst, 958 int i) 959 { 960 int ret; 961 962 if (i <= score->rule) { 963 switch (i) { 964 case IPV6_SADDR_RULE_SCOPE: 965 ret = score->scopedist; 966 break; 967 case IPV6_SADDR_RULE_PREFIX: 968 ret = score->matchlen; 969 break; 970 default: 971 ret = !!test_bit(i, score->scorebits); 972 } 973 goto out; 974 } 975 976 switch (i) { 977 case IPV6_SADDR_RULE_INIT: 978 /* Rule 0: remember if hiscore is not ready yet */ 979 ret = !!score->ifa; 980 break; 981 case IPV6_SADDR_RULE_LOCAL: 982 /* Rule 1: Prefer same address */ 983 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 984 break; 985 case IPV6_SADDR_RULE_SCOPE: 986 /* Rule 2: Prefer appropriate scope 987 * 988 * ret 989 * ^ 990 * -1 | d 15 991 * ---+--+-+---> scope 992 * | 993 * | d is scope of the destination. 994 * B-d | \ 995 * | \ <- smaller scope is better if 996 * B-15 | \ if scope is enough for destinaion. 997 * | ret = B - scope (-1 <= scope >= d <= 15). 998 * d-C-1 | / 999 * |/ <- greater is better 1000 * -C / if scope is not enough for destination. 1001 * /| ret = scope - C (-1 <= d < scope <= 15). 1002 * 1003 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1004 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1005 * Assume B = 0 and we get C > 29. 1006 */ 1007 ret = __ipv6_addr_src_scope(score->addr_type); 1008 if (ret >= dst->scope) 1009 ret = -ret; 1010 else 1011 ret -= 128; /* 30 is enough */ 1012 score->scopedist = ret; 1013 break; 1014 case IPV6_SADDR_RULE_PREFERRED: 1015 /* Rule 3: Avoid deprecated and optimistic addresses */ 1016 ret = ipv6_saddr_preferred(score->addr_type) || 1017 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1018 break; 1019 #ifdef CONFIG_IPV6_MIP6 1020 case IPV6_SADDR_RULE_HOA: 1021 { 1022 /* Rule 4: Prefer home address */ 1023 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1024 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1025 break; 1026 } 1027 #endif 1028 case IPV6_SADDR_RULE_OIF: 1029 /* Rule 5: Prefer outgoing interface */ 1030 ret = (!dst->ifindex || 1031 dst->ifindex == score->ifa->idev->dev->ifindex); 1032 break; 1033 case IPV6_SADDR_RULE_LABEL: 1034 /* Rule 6: Prefer matching label */ 1035 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type, 1036 score->ifa->idev->dev->ifindex) == dst->label; 1037 break; 1038 #ifdef CONFIG_IPV6_PRIVACY 1039 case IPV6_SADDR_RULE_PRIVACY: 1040 { 1041 /* Rule 7: Prefer public address 1042 * Note: prefer temprary address if use_tempaddr >= 2 1043 */ 1044 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1045 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1046 score->ifa->idev->cnf.use_tempaddr >= 2; 1047 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1048 break; 1049 } 1050 #endif 1051 case IPV6_SADDR_RULE_ORCHID: 1052 /* Rule 8-: Prefer ORCHID vs ORCHID or 1053 * non-ORCHID vs non-ORCHID 1054 */ 1055 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1056 ipv6_addr_orchid(dst->addr)); 1057 break; 1058 case IPV6_SADDR_RULE_PREFIX: 1059 /* Rule 8: Use longest matching prefix */ 1060 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1061 dst->addr); 1062 break; 1063 default: 1064 ret = 0; 1065 } 1066 1067 if (ret) 1068 __set_bit(i, score->scorebits); 1069 score->rule = i; 1070 out: 1071 return ret; 1072 } 1073 1074 int ipv6_dev_get_saddr(struct net_device *dst_dev, 1075 const struct in6_addr *daddr, unsigned int prefs, 1076 struct in6_addr *saddr) 1077 { 1078 struct ipv6_saddr_score scores[2], 1079 *score = &scores[0], *hiscore = &scores[1]; 1080 struct net *net = dev_net(dst_dev); 1081 struct ipv6_saddr_dst dst; 1082 struct net_device *dev; 1083 int dst_type; 1084 1085 dst_type = __ipv6_addr_type(daddr); 1086 dst.addr = daddr; 1087 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1088 dst.scope = __ipv6_addr_src_scope(dst_type); 1089 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex); 1090 dst.prefs = prefs; 1091 1092 hiscore->rule = -1; 1093 hiscore->ifa = NULL; 1094 1095 read_lock(&dev_base_lock); 1096 rcu_read_lock(); 1097 1098 for_each_netdev(net, dev) { 1099 struct inet6_dev *idev; 1100 1101 /* Candidate Source Address (section 4) 1102 * - multicast and link-local destination address, 1103 * the set of candidate source address MUST only 1104 * include addresses assigned to interfaces 1105 * belonging to the same link as the outgoing 1106 * interface. 1107 * (- For site-local destination addresses, the 1108 * set of candidate source addresses MUST only 1109 * include addresses assigned to interfaces 1110 * belonging to the same site as the outgoing 1111 * interface.) 1112 */ 1113 if (((dst_type & IPV6_ADDR_MULTICAST) || 1114 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1115 dst.ifindex && dev->ifindex != dst.ifindex) 1116 continue; 1117 1118 idev = __in6_dev_get(dev); 1119 if (!idev) 1120 continue; 1121 1122 read_lock_bh(&idev->lock); 1123 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1124 int i; 1125 1126 /* 1127 * - Tentative Address (RFC2462 section 5.4) 1128 * - A tentative address is not considered 1129 * "assigned to an interface" in the traditional 1130 * sense, unless it is also flagged as optimistic. 1131 * - Candidate Source Address (section 4) 1132 * - In any case, anycast addresses, multicast 1133 * addresses, and the unspecified address MUST 1134 * NOT be included in a candidate set. 1135 */ 1136 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1137 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1138 continue; 1139 1140 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1141 1142 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1143 score->addr_type & IPV6_ADDR_MULTICAST)) { 1144 LIMIT_NETDEBUG(KERN_DEBUG 1145 "ADDRCONF: unspecified / multicast address " 1146 "assigned as unicast address on %s", 1147 dev->name); 1148 continue; 1149 } 1150 1151 score->rule = -1; 1152 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1153 1154 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1155 int minihiscore, miniscore; 1156 1157 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i); 1158 miniscore = ipv6_get_saddr_eval(score, &dst, i); 1159 1160 if (minihiscore > miniscore) { 1161 if (i == IPV6_SADDR_RULE_SCOPE && 1162 score->scopedist > 0) { 1163 /* 1164 * special case: 1165 * each remaining entry 1166 * has too small (not enough) 1167 * scope, because ifa entries 1168 * are sorted by their scope 1169 * values. 1170 */ 1171 goto try_nextdev; 1172 } 1173 break; 1174 } else if (minihiscore < miniscore) { 1175 struct ipv6_saddr_score *tmp; 1176 1177 if (hiscore->ifa) 1178 in6_ifa_put(hiscore->ifa); 1179 1180 in6_ifa_hold(score->ifa); 1181 1182 tmp = hiscore; 1183 hiscore = score; 1184 score = tmp; 1185 1186 /* restore our iterator */ 1187 score->ifa = hiscore->ifa; 1188 1189 break; 1190 } 1191 } 1192 } 1193 try_nextdev: 1194 read_unlock_bh(&idev->lock); 1195 } 1196 rcu_read_unlock(); 1197 read_unlock(&dev_base_lock); 1198 1199 if (!hiscore->ifa) 1200 return -EADDRNOTAVAIL; 1201 1202 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1203 in6_ifa_put(hiscore->ifa); 1204 return 0; 1205 } 1206 1207 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1208 1209 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1210 unsigned char banned_flags) 1211 { 1212 struct inet6_dev *idev; 1213 int err = -EADDRNOTAVAIL; 1214 1215 rcu_read_lock(); 1216 if ((idev = __in6_dev_get(dev)) != NULL) { 1217 struct inet6_ifaddr *ifp; 1218 1219 read_lock_bh(&idev->lock); 1220 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1221 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1222 ipv6_addr_copy(addr, &ifp->addr); 1223 err = 0; 1224 break; 1225 } 1226 } 1227 read_unlock_bh(&idev->lock); 1228 } 1229 rcu_read_unlock(); 1230 return err; 1231 } 1232 1233 static int ipv6_count_addresses(struct inet6_dev *idev) 1234 { 1235 int cnt = 0; 1236 struct inet6_ifaddr *ifp; 1237 1238 read_lock_bh(&idev->lock); 1239 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1240 cnt++; 1241 read_unlock_bh(&idev->lock); 1242 return cnt; 1243 } 1244 1245 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1246 struct net_device *dev, int strict) 1247 { 1248 struct inet6_ifaddr * ifp; 1249 u8 hash = ipv6_addr_hash(addr); 1250 1251 read_lock_bh(&addrconf_hash_lock); 1252 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1253 if (!net_eq(dev_net(ifp->idev->dev), net)) 1254 continue; 1255 if (ipv6_addr_equal(&ifp->addr, addr) && 1256 !(ifp->flags&IFA_F_TENTATIVE)) { 1257 if (dev == NULL || ifp->idev->dev == dev || 1258 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1259 break; 1260 } 1261 } 1262 read_unlock_bh(&addrconf_hash_lock); 1263 return ifp != NULL; 1264 } 1265 EXPORT_SYMBOL(ipv6_chk_addr); 1266 1267 static 1268 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1269 struct net_device *dev) 1270 { 1271 struct inet6_ifaddr * ifp; 1272 u8 hash = ipv6_addr_hash(addr); 1273 1274 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1275 if (!net_eq(dev_net(ifp->idev->dev), net)) 1276 continue; 1277 if (ipv6_addr_equal(&ifp->addr, addr)) { 1278 if (dev == NULL || ifp->idev->dev == dev) 1279 break; 1280 } 1281 } 1282 return ifp != NULL; 1283 } 1284 1285 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1286 { 1287 struct inet6_dev *idev; 1288 struct inet6_ifaddr *ifa; 1289 int onlink; 1290 1291 onlink = 0; 1292 rcu_read_lock(); 1293 idev = __in6_dev_get(dev); 1294 if (idev) { 1295 read_lock_bh(&idev->lock); 1296 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1297 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1298 ifa->prefix_len); 1299 if (onlink) 1300 break; 1301 } 1302 read_unlock_bh(&idev->lock); 1303 } 1304 rcu_read_unlock(); 1305 return onlink; 1306 } 1307 1308 EXPORT_SYMBOL(ipv6_chk_prefix); 1309 1310 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1311 struct net_device *dev, int strict) 1312 { 1313 struct inet6_ifaddr * ifp; 1314 u8 hash = ipv6_addr_hash(addr); 1315 1316 read_lock_bh(&addrconf_hash_lock); 1317 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1318 if (!net_eq(dev_net(ifp->idev->dev), net)) 1319 continue; 1320 if (ipv6_addr_equal(&ifp->addr, addr)) { 1321 if (dev == NULL || ifp->idev->dev == dev || 1322 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1323 in6_ifa_hold(ifp); 1324 break; 1325 } 1326 } 1327 } 1328 read_unlock_bh(&addrconf_hash_lock); 1329 1330 return ifp; 1331 } 1332 1333 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1334 { 1335 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1336 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1337 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1338 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1339 int sk_ipv6only = ipv6_only_sock(sk); 1340 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1341 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1342 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1343 1344 if (!sk2_rcv_saddr && !sk_ipv6only) 1345 return 1; 1346 1347 if (addr_type2 == IPV6_ADDR_ANY && 1348 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1349 return 1; 1350 1351 if (addr_type == IPV6_ADDR_ANY && 1352 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1353 return 1; 1354 1355 if (sk2_rcv_saddr6 && 1356 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1357 return 1; 1358 1359 if (addr_type == IPV6_ADDR_MAPPED && 1360 !sk2_ipv6only && 1361 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1362 return 1; 1363 1364 return 0; 1365 } 1366 1367 /* Gets referenced address, destroys ifaddr */ 1368 1369 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1370 { 1371 if (ifp->flags&IFA_F_PERMANENT) { 1372 spin_lock_bh(&ifp->lock); 1373 addrconf_del_timer(ifp); 1374 ifp->flags |= IFA_F_TENTATIVE; 1375 spin_unlock_bh(&ifp->lock); 1376 in6_ifa_put(ifp); 1377 #ifdef CONFIG_IPV6_PRIVACY 1378 } else if (ifp->flags&IFA_F_TEMPORARY) { 1379 struct inet6_ifaddr *ifpub; 1380 spin_lock_bh(&ifp->lock); 1381 ifpub = ifp->ifpub; 1382 if (ifpub) { 1383 in6_ifa_hold(ifpub); 1384 spin_unlock_bh(&ifp->lock); 1385 ipv6_create_tempaddr(ifpub, ifp); 1386 in6_ifa_put(ifpub); 1387 } else { 1388 spin_unlock_bh(&ifp->lock); 1389 } 1390 ipv6_del_addr(ifp); 1391 #endif 1392 } else 1393 ipv6_del_addr(ifp); 1394 } 1395 1396 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1397 { 1398 if (net_ratelimit()) 1399 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1400 addrconf_dad_stop(ifp); 1401 } 1402 1403 /* Join to solicited addr multicast group. */ 1404 1405 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1406 { 1407 struct in6_addr maddr; 1408 1409 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1410 return; 1411 1412 addrconf_addr_solict_mult(addr, &maddr); 1413 ipv6_dev_mc_inc(dev, &maddr); 1414 } 1415 1416 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1417 { 1418 struct in6_addr maddr; 1419 1420 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1421 return; 1422 1423 addrconf_addr_solict_mult(addr, &maddr); 1424 __ipv6_dev_mc_dec(idev, &maddr); 1425 } 1426 1427 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1428 { 1429 struct in6_addr addr; 1430 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1431 if (ipv6_addr_any(&addr)) 1432 return; 1433 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1434 } 1435 1436 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1437 { 1438 struct in6_addr addr; 1439 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1440 if (ipv6_addr_any(&addr)) 1441 return; 1442 __ipv6_dev_ac_dec(ifp->idev, &addr); 1443 } 1444 1445 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1446 { 1447 if (dev->addr_len != ETH_ALEN) 1448 return -1; 1449 memcpy(eui, dev->dev_addr, 3); 1450 memcpy(eui + 5, dev->dev_addr + 3, 3); 1451 1452 /* 1453 * The zSeries OSA network cards can be shared among various 1454 * OS instances, but the OSA cards have only one MAC address. 1455 * This leads to duplicate address conflicts in conjunction 1456 * with IPv6 if more than one instance uses the same card. 1457 * 1458 * The driver for these cards can deliver a unique 16-bit 1459 * identifier for each instance sharing the same card. It is 1460 * placed instead of 0xFFFE in the interface identifier. The 1461 * "u" bit of the interface identifier is not inverted in this 1462 * case. Hence the resulting interface identifier has local 1463 * scope according to RFC2373. 1464 */ 1465 if (dev->dev_id) { 1466 eui[3] = (dev->dev_id >> 8) & 0xFF; 1467 eui[4] = dev->dev_id & 0xFF; 1468 } else { 1469 eui[3] = 0xFF; 1470 eui[4] = 0xFE; 1471 eui[0] ^= 2; 1472 } 1473 return 0; 1474 } 1475 1476 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1477 { 1478 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1479 if (dev->addr_len != ARCNET_ALEN) 1480 return -1; 1481 memset(eui, 0, 7); 1482 eui[7] = *(u8*)dev->dev_addr; 1483 return 0; 1484 } 1485 1486 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1487 { 1488 if (dev->addr_len != INFINIBAND_ALEN) 1489 return -1; 1490 memcpy(eui, dev->dev_addr + 12, 8); 1491 eui[0] |= 2; 1492 return 0; 1493 } 1494 1495 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1496 { 1497 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1498 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1499 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1500 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1501 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1502 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1503 eui[1] = 0; 1504 eui[2] = 0x5E; 1505 eui[3] = 0xFE; 1506 memcpy(eui + 4, &addr, 4); 1507 return 0; 1508 } 1509 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1510 1511 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1512 { 1513 if (dev->priv_flags & IFF_ISATAP) 1514 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1515 return -1; 1516 } 1517 1518 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1519 { 1520 switch (dev->type) { 1521 case ARPHRD_ETHER: 1522 case ARPHRD_FDDI: 1523 case ARPHRD_IEEE802_TR: 1524 return addrconf_ifid_eui48(eui, dev); 1525 case ARPHRD_ARCNET: 1526 return addrconf_ifid_arcnet(eui, dev); 1527 case ARPHRD_INFINIBAND: 1528 return addrconf_ifid_infiniband(eui, dev); 1529 case ARPHRD_SIT: 1530 return addrconf_ifid_sit(eui, dev); 1531 } 1532 return -1; 1533 } 1534 1535 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1536 { 1537 int err = -1; 1538 struct inet6_ifaddr *ifp; 1539 1540 read_lock_bh(&idev->lock); 1541 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1542 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1543 memcpy(eui, ifp->addr.s6_addr+8, 8); 1544 err = 0; 1545 break; 1546 } 1547 } 1548 read_unlock_bh(&idev->lock); 1549 return err; 1550 } 1551 1552 #ifdef CONFIG_IPV6_PRIVACY 1553 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1554 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1555 { 1556 regen: 1557 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1558 idev->rndid[0] &= ~0x02; 1559 1560 /* 1561 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1562 * check if generated address is not inappropriate 1563 * 1564 * - Reserved subnet anycast (RFC 2526) 1565 * 11111101 11....11 1xxxxxxx 1566 * - ISATAP (RFC4214) 6.1 1567 * 00-00-5E-FE-xx-xx-xx-xx 1568 * - value 0 1569 * - XXX: already assigned to an address on the device 1570 */ 1571 if (idev->rndid[0] == 0xfd && 1572 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1573 (idev->rndid[7]&0x80)) 1574 goto regen; 1575 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1576 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1577 goto regen; 1578 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1579 goto regen; 1580 } 1581 1582 return 0; 1583 } 1584 1585 static void ipv6_regen_rndid(unsigned long data) 1586 { 1587 struct inet6_dev *idev = (struct inet6_dev *) data; 1588 unsigned long expires; 1589 1590 rcu_read_lock_bh(); 1591 write_lock_bh(&idev->lock); 1592 1593 if (idev->dead) 1594 goto out; 1595 1596 if (__ipv6_regen_rndid(idev) < 0) 1597 goto out; 1598 1599 expires = jiffies + 1600 idev->cnf.temp_prefered_lft * HZ - 1601 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1602 if (time_before(expires, jiffies)) { 1603 printk(KERN_WARNING 1604 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1605 idev->dev->name); 1606 goto out; 1607 } 1608 1609 if (!mod_timer(&idev->regen_timer, expires)) 1610 in6_dev_hold(idev); 1611 1612 out: 1613 write_unlock_bh(&idev->lock); 1614 rcu_read_unlock_bh(); 1615 in6_dev_put(idev); 1616 } 1617 1618 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1619 int ret = 0; 1620 1621 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1622 ret = __ipv6_regen_rndid(idev); 1623 return ret; 1624 } 1625 #endif 1626 1627 /* 1628 * Add prefix route. 1629 */ 1630 1631 static void 1632 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1633 unsigned long expires, u32 flags) 1634 { 1635 struct fib6_config cfg = { 1636 .fc_table = RT6_TABLE_PREFIX, 1637 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1638 .fc_ifindex = dev->ifindex, 1639 .fc_expires = expires, 1640 .fc_dst_len = plen, 1641 .fc_flags = RTF_UP | flags, 1642 .fc_nlinfo.nl_net = dev_net(dev), 1643 }; 1644 1645 ipv6_addr_copy(&cfg.fc_dst, pfx); 1646 1647 /* Prevent useless cloning on PtP SIT. 1648 This thing is done here expecting that the whole 1649 class of non-broadcast devices need not cloning. 1650 */ 1651 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1652 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1653 cfg.fc_flags |= RTF_NONEXTHOP; 1654 #endif 1655 1656 ip6_route_add(&cfg); 1657 } 1658 1659 /* Create "default" multicast route to the interface */ 1660 1661 static void addrconf_add_mroute(struct net_device *dev) 1662 { 1663 struct fib6_config cfg = { 1664 .fc_table = RT6_TABLE_LOCAL, 1665 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1666 .fc_ifindex = dev->ifindex, 1667 .fc_dst_len = 8, 1668 .fc_flags = RTF_UP, 1669 .fc_nlinfo.nl_net = dev_net(dev), 1670 }; 1671 1672 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1673 1674 ip6_route_add(&cfg); 1675 } 1676 1677 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1678 static void sit_route_add(struct net_device *dev) 1679 { 1680 struct fib6_config cfg = { 1681 .fc_table = RT6_TABLE_MAIN, 1682 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1683 .fc_ifindex = dev->ifindex, 1684 .fc_dst_len = 96, 1685 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1686 .fc_nlinfo.nl_net = dev_net(dev), 1687 }; 1688 1689 /* prefix length - 96 bits "::d.d.d.d" */ 1690 ip6_route_add(&cfg); 1691 } 1692 #endif 1693 1694 static void addrconf_add_lroute(struct net_device *dev) 1695 { 1696 struct in6_addr addr; 1697 1698 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1699 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1700 } 1701 1702 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1703 { 1704 struct inet6_dev *idev; 1705 1706 ASSERT_RTNL(); 1707 1708 if ((idev = ipv6_find_idev(dev)) == NULL) 1709 return NULL; 1710 1711 /* Add default multicast route */ 1712 addrconf_add_mroute(dev); 1713 1714 /* Add link local route */ 1715 addrconf_add_lroute(dev); 1716 return idev; 1717 } 1718 1719 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1720 { 1721 struct prefix_info *pinfo; 1722 __u32 valid_lft; 1723 __u32 prefered_lft; 1724 int addr_type; 1725 unsigned long rt_expires; 1726 struct inet6_dev *in6_dev; 1727 1728 pinfo = (struct prefix_info *) opt; 1729 1730 if (len < sizeof(struct prefix_info)) { 1731 ADBG(("addrconf: prefix option too short\n")); 1732 return; 1733 } 1734 1735 /* 1736 * Validation checks ([ADDRCONF], page 19) 1737 */ 1738 1739 addr_type = ipv6_addr_type(&pinfo->prefix); 1740 1741 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1742 return; 1743 1744 valid_lft = ntohl(pinfo->valid); 1745 prefered_lft = ntohl(pinfo->prefered); 1746 1747 if (prefered_lft > valid_lft) { 1748 if (net_ratelimit()) 1749 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1750 return; 1751 } 1752 1753 in6_dev = in6_dev_get(dev); 1754 1755 if (in6_dev == NULL) { 1756 if (net_ratelimit()) 1757 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1758 return; 1759 } 1760 1761 /* 1762 * Two things going on here: 1763 * 1) Add routes for on-link prefixes 1764 * 2) Configure prefixes with the auto flag set 1765 */ 1766 1767 /* Avoid arithmetic overflow. Really, we could 1768 save rt_expires in seconds, likely valid_lft, 1769 but it would require division in fib gc, that it 1770 not good. 1771 */ 1772 if (valid_lft >= 0x7FFFFFFF/HZ) 1773 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1774 else 1775 rt_expires = valid_lft * HZ; 1776 1777 /* 1778 * We convert this (in jiffies) to clock_t later. 1779 * Avoid arithmetic overflow there as well. 1780 * Overflow can happen only if HZ < USER_HZ. 1781 */ 1782 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1783 rt_expires = 0x7FFFFFFF / USER_HZ; 1784 1785 if (pinfo->onlink) { 1786 struct rt6_info *rt; 1787 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL, 1788 dev->ifindex, 1); 1789 1790 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1791 if (rt->rt6i_flags&RTF_EXPIRES) { 1792 if (valid_lft == 0) { 1793 ip6_del_rt(rt); 1794 rt = NULL; 1795 } else { 1796 rt->rt6i_expires = jiffies + rt_expires; 1797 } 1798 } 1799 } else if (valid_lft) { 1800 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1801 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1802 } 1803 if (rt) 1804 dst_release(&rt->u.dst); 1805 } 1806 1807 /* Try to figure out our local address for this prefix */ 1808 1809 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1810 struct inet6_ifaddr * ifp; 1811 struct in6_addr addr; 1812 int create = 0, update_lft = 0; 1813 1814 if (pinfo->prefix_len == 64) { 1815 memcpy(&addr, &pinfo->prefix, 8); 1816 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1817 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1818 in6_dev_put(in6_dev); 1819 return; 1820 } 1821 goto ok; 1822 } 1823 if (net_ratelimit()) 1824 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1825 pinfo->prefix_len); 1826 in6_dev_put(in6_dev); 1827 return; 1828 1829 ok: 1830 1831 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1); 1832 1833 if (ifp == NULL && valid_lft) { 1834 int max_addresses = in6_dev->cnf.max_addresses; 1835 u32 addr_flags = 0; 1836 1837 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1838 if (in6_dev->cnf.optimistic_dad && 1839 !ipv6_devconf.forwarding) 1840 addr_flags = IFA_F_OPTIMISTIC; 1841 #endif 1842 1843 /* Do not allow to create too much of autoconfigured 1844 * addresses; this would be too easy way to crash kernel. 1845 */ 1846 if (!max_addresses || 1847 ipv6_count_addresses(in6_dev) < max_addresses) 1848 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1849 addr_type&IPV6_ADDR_SCOPE_MASK, 1850 addr_flags); 1851 1852 if (!ifp || IS_ERR(ifp)) { 1853 in6_dev_put(in6_dev); 1854 return; 1855 } 1856 1857 update_lft = create = 1; 1858 ifp->cstamp = jiffies; 1859 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1860 } 1861 1862 if (ifp) { 1863 int flags; 1864 unsigned long now; 1865 #ifdef CONFIG_IPV6_PRIVACY 1866 struct inet6_ifaddr *ift; 1867 #endif 1868 u32 stored_lft; 1869 1870 /* update lifetime (RFC2462 5.5.3 e) */ 1871 spin_lock(&ifp->lock); 1872 now = jiffies; 1873 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1874 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1875 else 1876 stored_lft = 0; 1877 if (!update_lft && stored_lft) { 1878 if (valid_lft > MIN_VALID_LIFETIME || 1879 valid_lft > stored_lft) 1880 update_lft = 1; 1881 else if (stored_lft <= MIN_VALID_LIFETIME) { 1882 /* valid_lft <= stored_lft is always true */ 1883 /* XXX: IPsec */ 1884 update_lft = 0; 1885 } else { 1886 valid_lft = MIN_VALID_LIFETIME; 1887 if (valid_lft < prefered_lft) 1888 prefered_lft = valid_lft; 1889 update_lft = 1; 1890 } 1891 } 1892 1893 if (update_lft) { 1894 ifp->valid_lft = valid_lft; 1895 ifp->prefered_lft = prefered_lft; 1896 ifp->tstamp = now; 1897 flags = ifp->flags; 1898 ifp->flags &= ~IFA_F_DEPRECATED; 1899 spin_unlock(&ifp->lock); 1900 1901 if (!(flags&IFA_F_TENTATIVE)) 1902 ipv6_ifa_notify(0, ifp); 1903 } else 1904 spin_unlock(&ifp->lock); 1905 1906 #ifdef CONFIG_IPV6_PRIVACY 1907 read_lock_bh(&in6_dev->lock); 1908 /* update all temporary addresses in the list */ 1909 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1910 /* 1911 * When adjusting the lifetimes of an existing 1912 * temporary address, only lower the lifetimes. 1913 * Implementations must not increase the 1914 * lifetimes of an existing temporary address 1915 * when processing a Prefix Information Option. 1916 */ 1917 if (ifp != ift->ifpub) 1918 continue; 1919 1920 spin_lock(&ift->lock); 1921 flags = ift->flags; 1922 if (ift->valid_lft > valid_lft && 1923 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1924 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1925 if (ift->prefered_lft > prefered_lft && 1926 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1927 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1928 spin_unlock(&ift->lock); 1929 if (!(flags&IFA_F_TENTATIVE)) 1930 ipv6_ifa_notify(0, ift); 1931 } 1932 1933 if (create && in6_dev->cnf.use_tempaddr > 0) { 1934 /* 1935 * When a new public address is created as described in [ADDRCONF], 1936 * also create a new temporary address. 1937 */ 1938 read_unlock_bh(&in6_dev->lock); 1939 ipv6_create_tempaddr(ifp, NULL); 1940 } else { 1941 read_unlock_bh(&in6_dev->lock); 1942 } 1943 #endif 1944 in6_ifa_put(ifp); 1945 addrconf_verify(0); 1946 } 1947 } 1948 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1949 in6_dev_put(in6_dev); 1950 } 1951 1952 /* 1953 * Set destination address. 1954 * Special case for SIT interfaces where we create a new "virtual" 1955 * device. 1956 */ 1957 int addrconf_set_dstaddr(struct net *net, void __user *arg) 1958 { 1959 struct in6_ifreq ireq; 1960 struct net_device *dev; 1961 int err = -EINVAL; 1962 1963 rtnl_lock(); 1964 1965 err = -EFAULT; 1966 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1967 goto err_exit; 1968 1969 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 1970 1971 err = -ENODEV; 1972 if (dev == NULL) 1973 goto err_exit; 1974 1975 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1976 if (dev->type == ARPHRD_SIT) { 1977 struct ifreq ifr; 1978 mm_segment_t oldfs; 1979 struct ip_tunnel_parm p; 1980 1981 err = -EADDRNOTAVAIL; 1982 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1983 goto err_exit; 1984 1985 memset(&p, 0, sizeof(p)); 1986 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1987 p.iph.saddr = 0; 1988 p.iph.version = 4; 1989 p.iph.ihl = 5; 1990 p.iph.protocol = IPPROTO_IPV6; 1991 p.iph.ttl = 64; 1992 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 1993 1994 oldfs = get_fs(); set_fs(KERNEL_DS); 1995 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1996 set_fs(oldfs); 1997 1998 if (err == 0) { 1999 err = -ENOBUFS; 2000 dev = __dev_get_by_name(net, p.name); 2001 if (!dev) 2002 goto err_exit; 2003 err = dev_open(dev); 2004 } 2005 } 2006 #endif 2007 2008 err_exit: 2009 rtnl_unlock(); 2010 return err; 2011 } 2012 2013 /* 2014 * Manual configuration of address on an interface 2015 */ 2016 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2017 int plen, __u8 ifa_flags, __u32 prefered_lft, 2018 __u32 valid_lft) 2019 { 2020 struct inet6_ifaddr *ifp; 2021 struct inet6_dev *idev; 2022 struct net_device *dev; 2023 int scope; 2024 u32 flags = RTF_EXPIRES; 2025 2026 ASSERT_RTNL(); 2027 2028 /* check the lifetime */ 2029 if (!valid_lft || prefered_lft > valid_lft) 2030 return -EINVAL; 2031 2032 dev = __dev_get_by_index(net, ifindex); 2033 if (!dev) 2034 return -ENODEV; 2035 2036 if ((idev = addrconf_add_dev(dev)) == NULL) 2037 return -ENOBUFS; 2038 2039 scope = ipv6_addr_scope(pfx); 2040 2041 if (valid_lft == INFINITY_LIFE_TIME) { 2042 ifa_flags |= IFA_F_PERMANENT; 2043 flags = 0; 2044 } else if (valid_lft >= 0x7FFFFFFF/HZ) 2045 valid_lft = 0x7FFFFFFF/HZ; 2046 2047 if (prefered_lft == 0) 2048 ifa_flags |= IFA_F_DEPRECATED; 2049 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 2050 (prefered_lft != INFINITY_LIFE_TIME)) 2051 prefered_lft = 0x7FFFFFFF/HZ; 2052 2053 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2054 2055 if (!IS_ERR(ifp)) { 2056 spin_lock_bh(&ifp->lock); 2057 ifp->valid_lft = valid_lft; 2058 ifp->prefered_lft = prefered_lft; 2059 ifp->tstamp = jiffies; 2060 spin_unlock_bh(&ifp->lock); 2061 2062 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2063 jiffies_to_clock_t(valid_lft * HZ), flags); 2064 /* 2065 * Note that section 3.1 of RFC 4429 indicates 2066 * that the Optimistic flag should not be set for 2067 * manually configured addresses 2068 */ 2069 addrconf_dad_start(ifp, 0); 2070 in6_ifa_put(ifp); 2071 addrconf_verify(0); 2072 return 0; 2073 } 2074 2075 return PTR_ERR(ifp); 2076 } 2077 2078 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2079 int plen) 2080 { 2081 struct inet6_ifaddr *ifp; 2082 struct inet6_dev *idev; 2083 struct net_device *dev; 2084 2085 dev = __dev_get_by_index(net, ifindex); 2086 if (!dev) 2087 return -ENODEV; 2088 2089 if ((idev = __in6_dev_get(dev)) == NULL) 2090 return -ENXIO; 2091 2092 read_lock_bh(&idev->lock); 2093 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2094 if (ifp->prefix_len == plen && 2095 ipv6_addr_equal(pfx, &ifp->addr)) { 2096 in6_ifa_hold(ifp); 2097 read_unlock_bh(&idev->lock); 2098 2099 ipv6_del_addr(ifp); 2100 2101 /* If the last address is deleted administratively, 2102 disable IPv6 on this interface. 2103 */ 2104 if (idev->addr_list == NULL) 2105 addrconf_ifdown(idev->dev, 1); 2106 return 0; 2107 } 2108 } 2109 read_unlock_bh(&idev->lock); 2110 return -EADDRNOTAVAIL; 2111 } 2112 2113 2114 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2115 { 2116 struct in6_ifreq ireq; 2117 int err; 2118 2119 if (!capable(CAP_NET_ADMIN)) 2120 return -EPERM; 2121 2122 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2123 return -EFAULT; 2124 2125 rtnl_lock(); 2126 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2127 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2128 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2129 rtnl_unlock(); 2130 return err; 2131 } 2132 2133 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2134 { 2135 struct in6_ifreq ireq; 2136 int err; 2137 2138 if (!capable(CAP_NET_ADMIN)) 2139 return -EPERM; 2140 2141 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2142 return -EFAULT; 2143 2144 rtnl_lock(); 2145 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2146 ireq.ifr6_prefixlen); 2147 rtnl_unlock(); 2148 return err; 2149 } 2150 2151 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2152 static void sit_add_v4_addrs(struct inet6_dev *idev) 2153 { 2154 struct inet6_ifaddr * ifp; 2155 struct in6_addr addr; 2156 struct net_device *dev; 2157 struct net *net = dev_net(idev->dev); 2158 int scope; 2159 2160 ASSERT_RTNL(); 2161 2162 memset(&addr, 0, sizeof(struct in6_addr)); 2163 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2164 2165 if (idev->dev->flags&IFF_POINTOPOINT) { 2166 addr.s6_addr32[0] = htonl(0xfe800000); 2167 scope = IFA_LINK; 2168 } else { 2169 scope = IPV6_ADDR_COMPATv4; 2170 } 2171 2172 if (addr.s6_addr32[3]) { 2173 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2174 if (!IS_ERR(ifp)) { 2175 spin_lock_bh(&ifp->lock); 2176 ifp->flags &= ~IFA_F_TENTATIVE; 2177 spin_unlock_bh(&ifp->lock); 2178 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2179 in6_ifa_put(ifp); 2180 } 2181 return; 2182 } 2183 2184 for_each_netdev(net, dev) { 2185 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2186 if (in_dev && (dev->flags & IFF_UP)) { 2187 struct in_ifaddr * ifa; 2188 2189 int flag = scope; 2190 2191 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2192 int plen; 2193 2194 addr.s6_addr32[3] = ifa->ifa_local; 2195 2196 if (ifa->ifa_scope == RT_SCOPE_LINK) 2197 continue; 2198 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2199 if (idev->dev->flags&IFF_POINTOPOINT) 2200 continue; 2201 flag |= IFA_HOST; 2202 } 2203 if (idev->dev->flags&IFF_POINTOPOINT) 2204 plen = 64; 2205 else 2206 plen = 96; 2207 2208 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2209 IFA_F_PERMANENT); 2210 if (!IS_ERR(ifp)) { 2211 spin_lock_bh(&ifp->lock); 2212 ifp->flags &= ~IFA_F_TENTATIVE; 2213 spin_unlock_bh(&ifp->lock); 2214 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2215 in6_ifa_put(ifp); 2216 } 2217 } 2218 } 2219 } 2220 } 2221 #endif 2222 2223 static void init_loopback(struct net_device *dev) 2224 { 2225 struct inet6_dev *idev; 2226 struct inet6_ifaddr * ifp; 2227 2228 /* ::1 */ 2229 2230 ASSERT_RTNL(); 2231 2232 if ((idev = ipv6_find_idev(dev)) == NULL) { 2233 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2234 return; 2235 } 2236 2237 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2238 if (!IS_ERR(ifp)) { 2239 spin_lock_bh(&ifp->lock); 2240 ifp->flags &= ~IFA_F_TENTATIVE; 2241 spin_unlock_bh(&ifp->lock); 2242 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2243 in6_ifa_put(ifp); 2244 } 2245 } 2246 2247 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2248 { 2249 struct inet6_ifaddr * ifp; 2250 u32 addr_flags = IFA_F_PERMANENT; 2251 2252 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2253 if (idev->cnf.optimistic_dad && 2254 !ipv6_devconf.forwarding) 2255 addr_flags |= IFA_F_OPTIMISTIC; 2256 #endif 2257 2258 2259 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2260 if (!IS_ERR(ifp)) { 2261 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2262 addrconf_dad_start(ifp, 0); 2263 in6_ifa_put(ifp); 2264 } 2265 } 2266 2267 static void addrconf_dev_config(struct net_device *dev) 2268 { 2269 struct in6_addr addr; 2270 struct inet6_dev * idev; 2271 2272 ASSERT_RTNL(); 2273 2274 if ((dev->type != ARPHRD_ETHER) && 2275 (dev->type != ARPHRD_FDDI) && 2276 (dev->type != ARPHRD_IEEE802_TR) && 2277 (dev->type != ARPHRD_ARCNET) && 2278 (dev->type != ARPHRD_INFINIBAND)) { 2279 /* Alas, we support only Ethernet autoconfiguration. */ 2280 return; 2281 } 2282 2283 idev = addrconf_add_dev(dev); 2284 if (idev == NULL) 2285 return; 2286 2287 memset(&addr, 0, sizeof(struct in6_addr)); 2288 addr.s6_addr32[0] = htonl(0xFE800000); 2289 2290 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2291 addrconf_add_linklocal(idev, &addr); 2292 } 2293 2294 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2295 static void addrconf_sit_config(struct net_device *dev) 2296 { 2297 struct inet6_dev *idev; 2298 2299 ASSERT_RTNL(); 2300 2301 /* 2302 * Configure the tunnel with one of our IPv4 2303 * addresses... we should configure all of 2304 * our v4 addrs in the tunnel 2305 */ 2306 2307 if ((idev = ipv6_find_idev(dev)) == NULL) { 2308 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2309 return; 2310 } 2311 2312 if (dev->priv_flags & IFF_ISATAP) { 2313 struct in6_addr addr; 2314 2315 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2316 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2317 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2318 addrconf_add_linklocal(idev, &addr); 2319 return; 2320 } 2321 2322 sit_add_v4_addrs(idev); 2323 2324 if (dev->flags&IFF_POINTOPOINT) { 2325 addrconf_add_mroute(dev); 2326 addrconf_add_lroute(dev); 2327 } else 2328 sit_route_add(dev); 2329 } 2330 #endif 2331 2332 static inline int 2333 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2334 { 2335 struct in6_addr lladdr; 2336 2337 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2338 addrconf_add_linklocal(idev, &lladdr); 2339 return 0; 2340 } 2341 return -1; 2342 } 2343 2344 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2345 { 2346 struct net_device *link_dev; 2347 struct net *net = dev_net(idev->dev); 2348 2349 /* first try to inherit the link-local address from the link device */ 2350 if (idev->dev->iflink && 2351 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2352 if (!ipv6_inherit_linklocal(idev, link_dev)) 2353 return; 2354 } 2355 /* then try to inherit it from any device */ 2356 for_each_netdev(net, link_dev) { 2357 if (!ipv6_inherit_linklocal(idev, link_dev)) 2358 return; 2359 } 2360 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2361 } 2362 2363 /* 2364 * Autoconfigure tunnel with a link-local address so routing protocols, 2365 * DHCPv6, MLD etc. can be run over the virtual link 2366 */ 2367 2368 static void addrconf_ip6_tnl_config(struct net_device *dev) 2369 { 2370 struct inet6_dev *idev; 2371 2372 ASSERT_RTNL(); 2373 2374 if ((idev = addrconf_add_dev(dev)) == NULL) { 2375 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2376 return; 2377 } 2378 ip6_tnl_add_linklocal(idev); 2379 } 2380 2381 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2382 void * data) 2383 { 2384 struct net_device *dev = (struct net_device *) data; 2385 struct inet6_dev *idev = __in6_dev_get(dev); 2386 int run_pending = 0; 2387 int err; 2388 2389 switch(event) { 2390 case NETDEV_REGISTER: 2391 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2392 idev = ipv6_add_dev(dev); 2393 if (!idev) 2394 return notifier_from_errno(-ENOMEM); 2395 } 2396 break; 2397 case NETDEV_UP: 2398 case NETDEV_CHANGE: 2399 if (dev->flags & IFF_SLAVE) 2400 break; 2401 2402 if (event == NETDEV_UP) { 2403 if (!addrconf_qdisc_ok(dev)) { 2404 /* device is not ready yet. */ 2405 printk(KERN_INFO 2406 "ADDRCONF(NETDEV_UP): %s: " 2407 "link is not ready\n", 2408 dev->name); 2409 break; 2410 } 2411 2412 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2413 idev = ipv6_add_dev(dev); 2414 2415 if (idev) 2416 idev->if_flags |= IF_READY; 2417 } else { 2418 if (!addrconf_qdisc_ok(dev)) { 2419 /* device is still not ready. */ 2420 break; 2421 } 2422 2423 if (idev) { 2424 if (idev->if_flags & IF_READY) { 2425 /* device is already configured. */ 2426 break; 2427 } 2428 idev->if_flags |= IF_READY; 2429 } 2430 2431 printk(KERN_INFO 2432 "ADDRCONF(NETDEV_CHANGE): %s: " 2433 "link becomes ready\n", 2434 dev->name); 2435 2436 run_pending = 1; 2437 } 2438 2439 switch(dev->type) { 2440 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2441 case ARPHRD_SIT: 2442 addrconf_sit_config(dev); 2443 break; 2444 #endif 2445 case ARPHRD_TUNNEL6: 2446 addrconf_ip6_tnl_config(dev); 2447 break; 2448 case ARPHRD_LOOPBACK: 2449 init_loopback(dev); 2450 break; 2451 2452 default: 2453 addrconf_dev_config(dev); 2454 break; 2455 } 2456 if (idev) { 2457 if (run_pending) 2458 addrconf_dad_run(idev); 2459 2460 /* If the MTU changed during the interface down, when the 2461 interface up, the changed MTU must be reflected in the 2462 idev as well as routers. 2463 */ 2464 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2465 rt6_mtu_change(dev, dev->mtu); 2466 idev->cnf.mtu6 = dev->mtu; 2467 } 2468 idev->tstamp = jiffies; 2469 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2470 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2471 stop IPv6 on this interface. 2472 */ 2473 if (dev->mtu < IPV6_MIN_MTU) 2474 addrconf_ifdown(dev, event != NETDEV_DOWN); 2475 } 2476 break; 2477 2478 case NETDEV_CHANGEMTU: 2479 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2480 rt6_mtu_change(dev, dev->mtu); 2481 idev->cnf.mtu6 = dev->mtu; 2482 break; 2483 } 2484 2485 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2486 idev = ipv6_add_dev(dev); 2487 if (idev) 2488 break; 2489 } 2490 2491 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2492 2493 case NETDEV_DOWN: 2494 case NETDEV_UNREGISTER: 2495 /* 2496 * Remove all addresses from this interface. 2497 */ 2498 addrconf_ifdown(dev, event != NETDEV_DOWN); 2499 break; 2500 2501 case NETDEV_CHANGENAME: 2502 if (idev) { 2503 snmp6_unregister_dev(idev); 2504 addrconf_sysctl_unregister(idev); 2505 addrconf_sysctl_register(idev); 2506 err = snmp6_register_dev(idev); 2507 if (err) 2508 return notifier_from_errno(err); 2509 } 2510 break; 2511 } 2512 2513 return NOTIFY_OK; 2514 } 2515 2516 /* 2517 * addrconf module should be notified of a device going up 2518 */ 2519 static struct notifier_block ipv6_dev_notf = { 2520 .notifier_call = addrconf_notify, 2521 .priority = 0 2522 }; 2523 2524 static int addrconf_ifdown(struct net_device *dev, int how) 2525 { 2526 struct inet6_dev *idev; 2527 struct inet6_ifaddr *ifa, **bifa; 2528 struct net *net = dev_net(dev); 2529 int i; 2530 2531 ASSERT_RTNL(); 2532 2533 if ((dev->flags & IFF_LOOPBACK) && how == 1) 2534 how = 0; 2535 2536 rt6_ifdown(net, dev); 2537 neigh_ifdown(&nd_tbl, dev); 2538 2539 idev = __in6_dev_get(dev); 2540 if (idev == NULL) 2541 return -ENODEV; 2542 2543 /* Step 1: remove reference to ipv6 device from parent device. 2544 Do not dev_put! 2545 */ 2546 if (how) { 2547 idev->dead = 1; 2548 2549 /* protected by rtnl_lock */ 2550 rcu_assign_pointer(dev->ip6_ptr, NULL); 2551 2552 /* Step 1.5: remove snmp6 entry */ 2553 snmp6_unregister_dev(idev); 2554 2555 } 2556 2557 /* Step 2: clear hash table */ 2558 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2559 bifa = &inet6_addr_lst[i]; 2560 2561 write_lock_bh(&addrconf_hash_lock); 2562 while ((ifa = *bifa) != NULL) { 2563 if (ifa->idev == idev) { 2564 *bifa = ifa->lst_next; 2565 ifa->lst_next = NULL; 2566 addrconf_del_timer(ifa); 2567 in6_ifa_put(ifa); 2568 continue; 2569 } 2570 bifa = &ifa->lst_next; 2571 } 2572 write_unlock_bh(&addrconf_hash_lock); 2573 } 2574 2575 write_lock_bh(&idev->lock); 2576 2577 /* Step 3: clear flags for stateless addrconf */ 2578 if (!how) 2579 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2580 2581 /* Step 4: clear address list */ 2582 #ifdef CONFIG_IPV6_PRIVACY 2583 if (how && del_timer(&idev->regen_timer)) 2584 in6_dev_put(idev); 2585 2586 /* clear tempaddr list */ 2587 while ((ifa = idev->tempaddr_list) != NULL) { 2588 idev->tempaddr_list = ifa->tmp_next; 2589 ifa->tmp_next = NULL; 2590 ifa->dead = 1; 2591 write_unlock_bh(&idev->lock); 2592 spin_lock_bh(&ifa->lock); 2593 2594 if (ifa->ifpub) { 2595 in6_ifa_put(ifa->ifpub); 2596 ifa->ifpub = NULL; 2597 } 2598 spin_unlock_bh(&ifa->lock); 2599 in6_ifa_put(ifa); 2600 write_lock_bh(&idev->lock); 2601 } 2602 #endif 2603 while ((ifa = idev->addr_list) != NULL) { 2604 idev->addr_list = ifa->if_next; 2605 ifa->if_next = NULL; 2606 ifa->dead = 1; 2607 addrconf_del_timer(ifa); 2608 write_unlock_bh(&idev->lock); 2609 2610 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2611 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2612 in6_ifa_put(ifa); 2613 2614 write_lock_bh(&idev->lock); 2615 } 2616 write_unlock_bh(&idev->lock); 2617 2618 /* Step 5: Discard multicast list */ 2619 2620 if (how) 2621 ipv6_mc_destroy_dev(idev); 2622 else 2623 ipv6_mc_down(idev); 2624 2625 idev->tstamp = jiffies; 2626 2627 /* Shot the device (if unregistered) */ 2628 2629 if (how) { 2630 addrconf_sysctl_unregister(idev); 2631 neigh_parms_release(&nd_tbl, idev->nd_parms); 2632 neigh_ifdown(&nd_tbl, dev); 2633 in6_dev_put(idev); 2634 } 2635 return 0; 2636 } 2637 2638 static void addrconf_rs_timer(unsigned long data) 2639 { 2640 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2641 2642 if (ifp->idev->cnf.forwarding) 2643 goto out; 2644 2645 if (ifp->idev->if_flags & IF_RA_RCVD) { 2646 /* 2647 * Announcement received after solicitation 2648 * was sent 2649 */ 2650 goto out; 2651 } 2652 2653 spin_lock(&ifp->lock); 2654 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2655 /* The wait after the last probe can be shorter */ 2656 addrconf_mod_timer(ifp, AC_RS, 2657 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2658 ifp->idev->cnf.rtr_solicit_delay : 2659 ifp->idev->cnf.rtr_solicit_interval); 2660 spin_unlock(&ifp->lock); 2661 2662 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2663 } else { 2664 spin_unlock(&ifp->lock); 2665 /* 2666 * Note: we do not support deprecated "all on-link" 2667 * assumption any longer. 2668 */ 2669 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2670 ifp->idev->dev->name); 2671 } 2672 2673 out: 2674 in6_ifa_put(ifp); 2675 } 2676 2677 /* 2678 * Duplicate Address Detection 2679 */ 2680 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2681 { 2682 unsigned long rand_num; 2683 struct inet6_dev *idev = ifp->idev; 2684 2685 if (ifp->flags & IFA_F_OPTIMISTIC) 2686 rand_num = 0; 2687 else 2688 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2689 2690 ifp->probes = idev->cnf.dad_transmits; 2691 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2692 } 2693 2694 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2695 { 2696 struct inet6_dev *idev = ifp->idev; 2697 struct net_device *dev = idev->dev; 2698 2699 addrconf_join_solict(dev, &ifp->addr); 2700 2701 net_srandom(ifp->addr.s6_addr32[3]); 2702 2703 read_lock_bh(&idev->lock); 2704 if (ifp->dead) 2705 goto out; 2706 spin_lock_bh(&ifp->lock); 2707 2708 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2709 !(ifp->flags&IFA_F_TENTATIVE) || 2710 ifp->flags & IFA_F_NODAD) { 2711 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2712 spin_unlock_bh(&ifp->lock); 2713 read_unlock_bh(&idev->lock); 2714 2715 addrconf_dad_completed(ifp); 2716 return; 2717 } 2718 2719 if (!(idev->if_flags & IF_READY)) { 2720 spin_unlock_bh(&ifp->lock); 2721 read_unlock_bh(&idev->lock); 2722 /* 2723 * If the defice is not ready: 2724 * - keep it tentative if it is a permanent address. 2725 * - otherwise, kill it. 2726 */ 2727 in6_ifa_hold(ifp); 2728 addrconf_dad_stop(ifp); 2729 return; 2730 } 2731 2732 /* 2733 * Optimistic nodes can start receiving 2734 * Frames right away 2735 */ 2736 if(ifp->flags & IFA_F_OPTIMISTIC) 2737 ip6_ins_rt(ifp->rt); 2738 2739 addrconf_dad_kick(ifp); 2740 spin_unlock_bh(&ifp->lock); 2741 out: 2742 read_unlock_bh(&idev->lock); 2743 } 2744 2745 static void addrconf_dad_timer(unsigned long data) 2746 { 2747 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2748 struct inet6_dev *idev = ifp->idev; 2749 struct in6_addr mcaddr; 2750 2751 read_lock_bh(&idev->lock); 2752 if (idev->dead) { 2753 read_unlock_bh(&idev->lock); 2754 goto out; 2755 } 2756 spin_lock_bh(&ifp->lock); 2757 if (ifp->probes == 0) { 2758 /* 2759 * DAD was successful 2760 */ 2761 2762 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2763 spin_unlock_bh(&ifp->lock); 2764 read_unlock_bh(&idev->lock); 2765 2766 addrconf_dad_completed(ifp); 2767 2768 goto out; 2769 } 2770 2771 ifp->probes--; 2772 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2773 spin_unlock_bh(&ifp->lock); 2774 read_unlock_bh(&idev->lock); 2775 2776 /* send a neighbour solicitation for our addr */ 2777 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2778 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2779 out: 2780 in6_ifa_put(ifp); 2781 } 2782 2783 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2784 { 2785 struct net_device * dev = ifp->idev->dev; 2786 2787 /* 2788 * Configure the address for reception. Now it is valid. 2789 */ 2790 2791 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2792 2793 /* If added prefix is link local and forwarding is off, 2794 start sending router solicitations. 2795 */ 2796 2797 if (ifp->idev->cnf.forwarding == 0 && 2798 ifp->idev->cnf.rtr_solicits > 0 && 2799 (dev->flags&IFF_LOOPBACK) == 0 && 2800 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2801 /* 2802 * If a host as already performed a random delay 2803 * [...] as part of DAD [...] there is no need 2804 * to delay again before sending the first RS 2805 */ 2806 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2807 2808 spin_lock_bh(&ifp->lock); 2809 ifp->probes = 1; 2810 ifp->idev->if_flags |= IF_RS_SENT; 2811 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2812 spin_unlock_bh(&ifp->lock); 2813 } 2814 } 2815 2816 static void addrconf_dad_run(struct inet6_dev *idev) { 2817 struct inet6_ifaddr *ifp; 2818 2819 read_lock_bh(&idev->lock); 2820 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2821 spin_lock_bh(&ifp->lock); 2822 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2823 spin_unlock_bh(&ifp->lock); 2824 continue; 2825 } 2826 spin_unlock_bh(&ifp->lock); 2827 addrconf_dad_kick(ifp); 2828 } 2829 read_unlock_bh(&idev->lock); 2830 } 2831 2832 #ifdef CONFIG_PROC_FS 2833 struct if6_iter_state { 2834 struct seq_net_private p; 2835 int bucket; 2836 }; 2837 2838 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2839 { 2840 struct inet6_ifaddr *ifa = NULL; 2841 struct if6_iter_state *state = seq->private; 2842 struct net *net = seq_file_net(seq); 2843 2844 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2845 ifa = inet6_addr_lst[state->bucket]; 2846 2847 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2848 ifa = ifa->lst_next; 2849 if (ifa) 2850 break; 2851 } 2852 return ifa; 2853 } 2854 2855 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2856 { 2857 struct if6_iter_state *state = seq->private; 2858 struct net *net = seq_file_net(seq); 2859 2860 ifa = ifa->lst_next; 2861 try_again: 2862 if (ifa) { 2863 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2864 ifa = ifa->lst_next; 2865 goto try_again; 2866 } 2867 } 2868 2869 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2870 ifa = inet6_addr_lst[state->bucket]; 2871 goto try_again; 2872 } 2873 2874 return ifa; 2875 } 2876 2877 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2878 { 2879 struct inet6_ifaddr *ifa = if6_get_first(seq); 2880 2881 if (ifa) 2882 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2883 --pos; 2884 return pos ? NULL : ifa; 2885 } 2886 2887 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2888 __acquires(addrconf_hash_lock) 2889 { 2890 read_lock_bh(&addrconf_hash_lock); 2891 return if6_get_idx(seq, *pos); 2892 } 2893 2894 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2895 { 2896 struct inet6_ifaddr *ifa; 2897 2898 ifa = if6_get_next(seq, v); 2899 ++*pos; 2900 return ifa; 2901 } 2902 2903 static void if6_seq_stop(struct seq_file *seq, void *v) 2904 __releases(addrconf_hash_lock) 2905 { 2906 read_unlock_bh(&addrconf_hash_lock); 2907 } 2908 2909 static int if6_seq_show(struct seq_file *seq, void *v) 2910 { 2911 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2912 seq_printf(seq, 2913 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2914 NIP6(ifp->addr), 2915 ifp->idev->dev->ifindex, 2916 ifp->prefix_len, 2917 ifp->scope, 2918 ifp->flags, 2919 ifp->idev->dev->name); 2920 return 0; 2921 } 2922 2923 static const struct seq_operations if6_seq_ops = { 2924 .start = if6_seq_start, 2925 .next = if6_seq_next, 2926 .show = if6_seq_show, 2927 .stop = if6_seq_stop, 2928 }; 2929 2930 static int if6_seq_open(struct inode *inode, struct file *file) 2931 { 2932 return seq_open_net(inode, file, &if6_seq_ops, 2933 sizeof(struct if6_iter_state)); 2934 } 2935 2936 static const struct file_operations if6_fops = { 2937 .owner = THIS_MODULE, 2938 .open = if6_seq_open, 2939 .read = seq_read, 2940 .llseek = seq_lseek, 2941 .release = seq_release_net, 2942 }; 2943 2944 static int if6_proc_net_init(struct net *net) 2945 { 2946 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 2947 return -ENOMEM; 2948 return 0; 2949 } 2950 2951 static void if6_proc_net_exit(struct net *net) 2952 { 2953 proc_net_remove(net, "if_inet6"); 2954 } 2955 2956 static struct pernet_operations if6_proc_net_ops = { 2957 .init = if6_proc_net_init, 2958 .exit = if6_proc_net_exit, 2959 }; 2960 2961 int __init if6_proc_init(void) 2962 { 2963 return register_pernet_subsys(&if6_proc_net_ops); 2964 } 2965 2966 void if6_proc_exit(void) 2967 { 2968 unregister_pernet_subsys(&if6_proc_net_ops); 2969 } 2970 #endif /* CONFIG_PROC_FS */ 2971 2972 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 2973 /* Check if address is a home address configured on any interface. */ 2974 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 2975 { 2976 int ret = 0; 2977 struct inet6_ifaddr * ifp; 2978 u8 hash = ipv6_addr_hash(addr); 2979 read_lock_bh(&addrconf_hash_lock); 2980 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2981 if (!net_eq(dev_net(ifp->idev->dev), net)) 2982 continue; 2983 if (ipv6_addr_equal(&ifp->addr, addr) && 2984 (ifp->flags & IFA_F_HOMEADDRESS)) { 2985 ret = 1; 2986 break; 2987 } 2988 } 2989 read_unlock_bh(&addrconf_hash_lock); 2990 return ret; 2991 } 2992 #endif 2993 2994 /* 2995 * Periodic address status verification 2996 */ 2997 2998 static void addrconf_verify(unsigned long foo) 2999 { 3000 struct inet6_ifaddr *ifp; 3001 unsigned long now, next; 3002 int i; 3003 3004 spin_lock_bh(&addrconf_verify_lock); 3005 now = jiffies; 3006 next = now + ADDR_CHECK_FREQUENCY; 3007 3008 del_timer(&addr_chk_timer); 3009 3010 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3011 3012 restart: 3013 read_lock(&addrconf_hash_lock); 3014 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3015 unsigned long age; 3016 #ifdef CONFIG_IPV6_PRIVACY 3017 unsigned long regen_advance; 3018 #endif 3019 3020 if (ifp->flags & IFA_F_PERMANENT) 3021 continue; 3022 3023 spin_lock(&ifp->lock); 3024 age = (now - ifp->tstamp) / HZ; 3025 3026 #ifdef CONFIG_IPV6_PRIVACY 3027 regen_advance = ifp->idev->cnf.regen_max_retry * 3028 ifp->idev->cnf.dad_transmits * 3029 ifp->idev->nd_parms->retrans_time / HZ; 3030 #endif 3031 3032 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3033 age >= ifp->valid_lft) { 3034 spin_unlock(&ifp->lock); 3035 in6_ifa_hold(ifp); 3036 read_unlock(&addrconf_hash_lock); 3037 ipv6_del_addr(ifp); 3038 goto restart; 3039 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3040 spin_unlock(&ifp->lock); 3041 continue; 3042 } else if (age >= ifp->prefered_lft) { 3043 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 3044 int deprecate = 0; 3045 3046 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3047 deprecate = 1; 3048 ifp->flags |= IFA_F_DEPRECATED; 3049 } 3050 3051 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3052 next = ifp->tstamp + ifp->valid_lft * HZ; 3053 3054 spin_unlock(&ifp->lock); 3055 3056 if (deprecate) { 3057 in6_ifa_hold(ifp); 3058 read_unlock(&addrconf_hash_lock); 3059 3060 ipv6_ifa_notify(0, ifp); 3061 in6_ifa_put(ifp); 3062 goto restart; 3063 } 3064 #ifdef CONFIG_IPV6_PRIVACY 3065 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3066 !(ifp->flags&IFA_F_TENTATIVE)) { 3067 if (age >= ifp->prefered_lft - regen_advance) { 3068 struct inet6_ifaddr *ifpub = ifp->ifpub; 3069 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3070 next = ifp->tstamp + ifp->prefered_lft * HZ; 3071 if (!ifp->regen_count && ifpub) { 3072 ifp->regen_count++; 3073 in6_ifa_hold(ifp); 3074 in6_ifa_hold(ifpub); 3075 spin_unlock(&ifp->lock); 3076 read_unlock(&addrconf_hash_lock); 3077 spin_lock(&ifpub->lock); 3078 ifpub->regen_count = 0; 3079 spin_unlock(&ifpub->lock); 3080 ipv6_create_tempaddr(ifpub, ifp); 3081 in6_ifa_put(ifpub); 3082 in6_ifa_put(ifp); 3083 goto restart; 3084 } 3085 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3086 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3087 spin_unlock(&ifp->lock); 3088 #endif 3089 } else { 3090 /* ifp->prefered_lft <= ifp->valid_lft */ 3091 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3092 next = ifp->tstamp + ifp->prefered_lft * HZ; 3093 spin_unlock(&ifp->lock); 3094 } 3095 } 3096 read_unlock(&addrconf_hash_lock); 3097 } 3098 3099 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3100 add_timer(&addr_chk_timer); 3101 spin_unlock_bh(&addrconf_verify_lock); 3102 } 3103 3104 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3105 { 3106 struct in6_addr *pfx = NULL; 3107 3108 if (addr) 3109 pfx = nla_data(addr); 3110 3111 if (local) { 3112 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3113 pfx = NULL; 3114 else 3115 pfx = nla_data(local); 3116 } 3117 3118 return pfx; 3119 } 3120 3121 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3122 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3123 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3124 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3125 }; 3126 3127 static int 3128 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3129 { 3130 struct net *net = sock_net(skb->sk); 3131 struct ifaddrmsg *ifm; 3132 struct nlattr *tb[IFA_MAX+1]; 3133 struct in6_addr *pfx; 3134 int err; 3135 3136 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3137 if (err < 0) 3138 return err; 3139 3140 ifm = nlmsg_data(nlh); 3141 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3142 if (pfx == NULL) 3143 return -EINVAL; 3144 3145 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3146 } 3147 3148 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3149 u32 prefered_lft, u32 valid_lft) 3150 { 3151 u32 flags = RTF_EXPIRES; 3152 3153 if (!valid_lft || (prefered_lft > valid_lft)) 3154 return -EINVAL; 3155 3156 if (valid_lft == INFINITY_LIFE_TIME) { 3157 ifa_flags |= IFA_F_PERMANENT; 3158 flags = 0; 3159 } else if (valid_lft >= 0x7FFFFFFF/HZ) 3160 valid_lft = 0x7FFFFFFF/HZ; 3161 3162 if (prefered_lft == 0) 3163 ifa_flags |= IFA_F_DEPRECATED; 3164 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 3165 (prefered_lft != INFINITY_LIFE_TIME)) 3166 prefered_lft = 0x7FFFFFFF/HZ; 3167 3168 spin_lock_bh(&ifp->lock); 3169 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3170 ifp->tstamp = jiffies; 3171 ifp->valid_lft = valid_lft; 3172 ifp->prefered_lft = prefered_lft; 3173 3174 spin_unlock_bh(&ifp->lock); 3175 if (!(ifp->flags&IFA_F_TENTATIVE)) 3176 ipv6_ifa_notify(0, ifp); 3177 3178 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3179 jiffies_to_clock_t(valid_lft * HZ), flags); 3180 addrconf_verify(0); 3181 3182 return 0; 3183 } 3184 3185 static int 3186 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3187 { 3188 struct net *net = sock_net(skb->sk); 3189 struct ifaddrmsg *ifm; 3190 struct nlattr *tb[IFA_MAX+1]; 3191 struct in6_addr *pfx; 3192 struct inet6_ifaddr *ifa; 3193 struct net_device *dev; 3194 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3195 u8 ifa_flags; 3196 int err; 3197 3198 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3199 if (err < 0) 3200 return err; 3201 3202 ifm = nlmsg_data(nlh); 3203 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3204 if (pfx == NULL) 3205 return -EINVAL; 3206 3207 if (tb[IFA_CACHEINFO]) { 3208 struct ifa_cacheinfo *ci; 3209 3210 ci = nla_data(tb[IFA_CACHEINFO]); 3211 valid_lft = ci->ifa_valid; 3212 preferred_lft = ci->ifa_prefered; 3213 } else { 3214 preferred_lft = INFINITY_LIFE_TIME; 3215 valid_lft = INFINITY_LIFE_TIME; 3216 } 3217 3218 dev = __dev_get_by_index(net, ifm->ifa_index); 3219 if (dev == NULL) 3220 return -ENODEV; 3221 3222 /* We ignore other flags so far. */ 3223 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3224 3225 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3226 if (ifa == NULL) { 3227 /* 3228 * It would be best to check for !NLM_F_CREATE here but 3229 * userspace alreay relies on not having to provide this. 3230 */ 3231 return inet6_addr_add(net, ifm->ifa_index, pfx, 3232 ifm->ifa_prefixlen, ifa_flags, 3233 preferred_lft, valid_lft); 3234 } 3235 3236 if (nlh->nlmsg_flags & NLM_F_EXCL || 3237 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3238 err = -EEXIST; 3239 else 3240 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3241 3242 in6_ifa_put(ifa); 3243 3244 return err; 3245 } 3246 3247 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3248 u8 scope, int ifindex) 3249 { 3250 struct ifaddrmsg *ifm; 3251 3252 ifm = nlmsg_data(nlh); 3253 ifm->ifa_family = AF_INET6; 3254 ifm->ifa_prefixlen = prefixlen; 3255 ifm->ifa_flags = flags; 3256 ifm->ifa_scope = scope; 3257 ifm->ifa_index = ifindex; 3258 } 3259 3260 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3261 unsigned long tstamp, u32 preferred, u32 valid) 3262 { 3263 struct ifa_cacheinfo ci; 3264 3265 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3266 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3267 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3268 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3269 ci.ifa_prefered = preferred; 3270 ci.ifa_valid = valid; 3271 3272 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3273 } 3274 3275 static inline int rt_scope(int ifa_scope) 3276 { 3277 if (ifa_scope & IFA_HOST) 3278 return RT_SCOPE_HOST; 3279 else if (ifa_scope & IFA_LINK) 3280 return RT_SCOPE_LINK; 3281 else if (ifa_scope & IFA_SITE) 3282 return RT_SCOPE_SITE; 3283 else 3284 return RT_SCOPE_UNIVERSE; 3285 } 3286 3287 static inline int inet6_ifaddr_msgsize(void) 3288 { 3289 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3290 + nla_total_size(16) /* IFA_ADDRESS */ 3291 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3292 } 3293 3294 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3295 u32 pid, u32 seq, int event, unsigned int flags) 3296 { 3297 struct nlmsghdr *nlh; 3298 u32 preferred, valid; 3299 3300 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3301 if (nlh == NULL) 3302 return -EMSGSIZE; 3303 3304 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3305 ifa->idev->dev->ifindex); 3306 3307 if (!(ifa->flags&IFA_F_PERMANENT)) { 3308 preferred = ifa->prefered_lft; 3309 valid = ifa->valid_lft; 3310 if (preferred != INFINITY_LIFE_TIME) { 3311 long tval = (jiffies - ifa->tstamp)/HZ; 3312 preferred -= tval; 3313 if (valid != INFINITY_LIFE_TIME) 3314 valid -= tval; 3315 } 3316 } else { 3317 preferred = INFINITY_LIFE_TIME; 3318 valid = INFINITY_LIFE_TIME; 3319 } 3320 3321 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3322 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3323 nlmsg_cancel(skb, nlh); 3324 return -EMSGSIZE; 3325 } 3326 3327 return nlmsg_end(skb, nlh); 3328 } 3329 3330 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3331 u32 pid, u32 seq, int event, u16 flags) 3332 { 3333 struct nlmsghdr *nlh; 3334 u8 scope = RT_SCOPE_UNIVERSE; 3335 int ifindex = ifmca->idev->dev->ifindex; 3336 3337 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3338 scope = RT_SCOPE_SITE; 3339 3340 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3341 if (nlh == NULL) 3342 return -EMSGSIZE; 3343 3344 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3345 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3346 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3347 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3348 nlmsg_cancel(skb, nlh); 3349 return -EMSGSIZE; 3350 } 3351 3352 return nlmsg_end(skb, nlh); 3353 } 3354 3355 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3356 u32 pid, u32 seq, int event, unsigned int flags) 3357 { 3358 struct nlmsghdr *nlh; 3359 u8 scope = RT_SCOPE_UNIVERSE; 3360 int ifindex = ifaca->aca_idev->dev->ifindex; 3361 3362 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3363 scope = RT_SCOPE_SITE; 3364 3365 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3366 if (nlh == NULL) 3367 return -EMSGSIZE; 3368 3369 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3370 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3371 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3372 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3373 nlmsg_cancel(skb, nlh); 3374 return -EMSGSIZE; 3375 } 3376 3377 return nlmsg_end(skb, nlh); 3378 } 3379 3380 enum addr_type_t 3381 { 3382 UNICAST_ADDR, 3383 MULTICAST_ADDR, 3384 ANYCAST_ADDR, 3385 }; 3386 3387 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3388 enum addr_type_t type) 3389 { 3390 int idx, ip_idx; 3391 int s_idx, s_ip_idx; 3392 int err = 1; 3393 struct net_device *dev; 3394 struct inet6_dev *idev = NULL; 3395 struct inet6_ifaddr *ifa; 3396 struct ifmcaddr6 *ifmca; 3397 struct ifacaddr6 *ifaca; 3398 struct net *net = sock_net(skb->sk); 3399 3400 s_idx = cb->args[0]; 3401 s_ip_idx = ip_idx = cb->args[1]; 3402 3403 idx = 0; 3404 for_each_netdev(net, dev) { 3405 if (idx < s_idx) 3406 goto cont; 3407 if (idx > s_idx) 3408 s_ip_idx = 0; 3409 ip_idx = 0; 3410 if ((idev = in6_dev_get(dev)) == NULL) 3411 goto cont; 3412 read_lock_bh(&idev->lock); 3413 switch (type) { 3414 case UNICAST_ADDR: 3415 /* unicast address incl. temp addr */ 3416 for (ifa = idev->addr_list; ifa; 3417 ifa = ifa->if_next, ip_idx++) { 3418 if (ip_idx < s_ip_idx) 3419 continue; 3420 err = inet6_fill_ifaddr(skb, ifa, 3421 NETLINK_CB(cb->skb).pid, 3422 cb->nlh->nlmsg_seq, 3423 RTM_NEWADDR, 3424 NLM_F_MULTI); 3425 } 3426 break; 3427 case MULTICAST_ADDR: 3428 /* multicast address */ 3429 for (ifmca = idev->mc_list; ifmca; 3430 ifmca = ifmca->next, ip_idx++) { 3431 if (ip_idx < s_ip_idx) 3432 continue; 3433 err = inet6_fill_ifmcaddr(skb, ifmca, 3434 NETLINK_CB(cb->skb).pid, 3435 cb->nlh->nlmsg_seq, 3436 RTM_GETMULTICAST, 3437 NLM_F_MULTI); 3438 } 3439 break; 3440 case ANYCAST_ADDR: 3441 /* anycast address */ 3442 for (ifaca = idev->ac_list; ifaca; 3443 ifaca = ifaca->aca_next, ip_idx++) { 3444 if (ip_idx < s_ip_idx) 3445 continue; 3446 err = inet6_fill_ifacaddr(skb, ifaca, 3447 NETLINK_CB(cb->skb).pid, 3448 cb->nlh->nlmsg_seq, 3449 RTM_GETANYCAST, 3450 NLM_F_MULTI); 3451 } 3452 break; 3453 default: 3454 break; 3455 } 3456 read_unlock_bh(&idev->lock); 3457 in6_dev_put(idev); 3458 3459 if (err <= 0) 3460 break; 3461 cont: 3462 idx++; 3463 } 3464 cb->args[0] = idx; 3465 cb->args[1] = ip_idx; 3466 return skb->len; 3467 } 3468 3469 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3470 { 3471 enum addr_type_t type = UNICAST_ADDR; 3472 3473 return inet6_dump_addr(skb, cb, type); 3474 } 3475 3476 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3477 { 3478 enum addr_type_t type = MULTICAST_ADDR; 3479 3480 return inet6_dump_addr(skb, cb, type); 3481 } 3482 3483 3484 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3485 { 3486 enum addr_type_t type = ANYCAST_ADDR; 3487 3488 return inet6_dump_addr(skb, cb, type); 3489 } 3490 3491 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3492 void *arg) 3493 { 3494 struct net *net = sock_net(in_skb->sk); 3495 struct ifaddrmsg *ifm; 3496 struct nlattr *tb[IFA_MAX+1]; 3497 struct in6_addr *addr = NULL; 3498 struct net_device *dev = NULL; 3499 struct inet6_ifaddr *ifa; 3500 struct sk_buff *skb; 3501 int err; 3502 3503 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3504 if (err < 0) 3505 goto errout; 3506 3507 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3508 if (addr == NULL) { 3509 err = -EINVAL; 3510 goto errout; 3511 } 3512 3513 ifm = nlmsg_data(nlh); 3514 if (ifm->ifa_index) 3515 dev = __dev_get_by_index(net, ifm->ifa_index); 3516 3517 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3518 err = -EADDRNOTAVAIL; 3519 goto errout; 3520 } 3521 3522 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3523 err = -ENOBUFS; 3524 goto errout_ifa; 3525 } 3526 3527 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3528 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3529 if (err < 0) { 3530 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3531 WARN_ON(err == -EMSGSIZE); 3532 kfree_skb(skb); 3533 goto errout_ifa; 3534 } 3535 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3536 errout_ifa: 3537 in6_ifa_put(ifa); 3538 errout: 3539 return err; 3540 } 3541 3542 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3543 { 3544 struct sk_buff *skb; 3545 struct net *net = dev_net(ifa->idev->dev); 3546 int err = -ENOBUFS; 3547 3548 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3549 if (skb == NULL) 3550 goto errout; 3551 3552 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3553 if (err < 0) { 3554 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3555 WARN_ON(err == -EMSGSIZE); 3556 kfree_skb(skb); 3557 goto errout; 3558 } 3559 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3560 errout: 3561 if (err < 0) 3562 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3563 } 3564 3565 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3566 __s32 *array, int bytes) 3567 { 3568 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3569 3570 memset(array, 0, bytes); 3571 array[DEVCONF_FORWARDING] = cnf->forwarding; 3572 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3573 array[DEVCONF_MTU6] = cnf->mtu6; 3574 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3575 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3576 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3577 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3578 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3579 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3580 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3581 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3582 #ifdef CONFIG_IPV6_PRIVACY 3583 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3584 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3585 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3586 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3587 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3588 #endif 3589 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3590 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3591 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3592 #ifdef CONFIG_IPV6_ROUTER_PREF 3593 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3594 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3595 #ifdef CONFIG_IPV6_ROUTE_INFO 3596 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3597 #endif 3598 #endif 3599 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3600 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3601 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3602 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3603 #endif 3604 #ifdef CONFIG_IPV6_MROUTE 3605 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3606 #endif 3607 } 3608 3609 static inline size_t inet6_if_nlmsg_size(void) 3610 { 3611 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3612 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3613 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3614 + nla_total_size(4) /* IFLA_MTU */ 3615 + nla_total_size(4) /* IFLA_LINK */ 3616 + nla_total_size( /* IFLA_PROTINFO */ 3617 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3618 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3619 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3620 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3621 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3622 ); 3623 } 3624 3625 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3626 int bytes) 3627 { 3628 int i; 3629 int pad = bytes - sizeof(u64) * items; 3630 BUG_ON(pad < 0); 3631 3632 /* Use put_unaligned() because stats may not be aligned for u64. */ 3633 put_unaligned(items, &stats[0]); 3634 for (i = 1; i < items; i++) 3635 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3636 3637 memset(&stats[items], 0, pad); 3638 } 3639 3640 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3641 int bytes) 3642 { 3643 switch(attrtype) { 3644 case IFLA_INET6_STATS: 3645 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3646 break; 3647 case IFLA_INET6_ICMP6STATS: 3648 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3649 break; 3650 } 3651 } 3652 3653 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3654 u32 pid, u32 seq, int event, unsigned int flags) 3655 { 3656 struct net_device *dev = idev->dev; 3657 struct nlattr *nla; 3658 struct ifinfomsg *hdr; 3659 struct nlmsghdr *nlh; 3660 void *protoinfo; 3661 struct ifla_cacheinfo ci; 3662 3663 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3664 if (nlh == NULL) 3665 return -EMSGSIZE; 3666 3667 hdr = nlmsg_data(nlh); 3668 hdr->ifi_family = AF_INET6; 3669 hdr->__ifi_pad = 0; 3670 hdr->ifi_type = dev->type; 3671 hdr->ifi_index = dev->ifindex; 3672 hdr->ifi_flags = dev_get_flags(dev); 3673 hdr->ifi_change = 0; 3674 3675 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3676 3677 if (dev->addr_len) 3678 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3679 3680 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3681 if (dev->ifindex != dev->iflink) 3682 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3683 3684 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3685 if (protoinfo == NULL) 3686 goto nla_put_failure; 3687 3688 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3689 3690 ci.max_reasm_len = IPV6_MAXPLEN; 3691 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3692 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3693 ci.reachable_time = idev->nd_parms->reachable_time; 3694 ci.retrans_time = idev->nd_parms->retrans_time; 3695 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3696 3697 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3698 if (nla == NULL) 3699 goto nla_put_failure; 3700 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3701 3702 /* XXX - MC not implemented */ 3703 3704 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3705 if (nla == NULL) 3706 goto nla_put_failure; 3707 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3708 3709 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3710 if (nla == NULL) 3711 goto nla_put_failure; 3712 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3713 3714 nla_nest_end(skb, protoinfo); 3715 return nlmsg_end(skb, nlh); 3716 3717 nla_put_failure: 3718 nlmsg_cancel(skb, nlh); 3719 return -EMSGSIZE; 3720 } 3721 3722 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3723 { 3724 struct net *net = sock_net(skb->sk); 3725 int idx, err; 3726 int s_idx = cb->args[0]; 3727 struct net_device *dev; 3728 struct inet6_dev *idev; 3729 3730 read_lock(&dev_base_lock); 3731 idx = 0; 3732 for_each_netdev(net, dev) { 3733 if (idx < s_idx) 3734 goto cont; 3735 if ((idev = in6_dev_get(dev)) == NULL) 3736 goto cont; 3737 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3738 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3739 in6_dev_put(idev); 3740 if (err <= 0) 3741 break; 3742 cont: 3743 idx++; 3744 } 3745 read_unlock(&dev_base_lock); 3746 cb->args[0] = idx; 3747 3748 return skb->len; 3749 } 3750 3751 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3752 { 3753 struct sk_buff *skb; 3754 struct net *net = dev_net(idev->dev); 3755 int err = -ENOBUFS; 3756 3757 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3758 if (skb == NULL) 3759 goto errout; 3760 3761 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3762 if (err < 0) { 3763 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3764 WARN_ON(err == -EMSGSIZE); 3765 kfree_skb(skb); 3766 goto errout; 3767 } 3768 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3769 errout: 3770 if (err < 0) 3771 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3772 } 3773 3774 static inline size_t inet6_prefix_nlmsg_size(void) 3775 { 3776 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3777 + nla_total_size(sizeof(struct in6_addr)) 3778 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3779 } 3780 3781 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3782 struct prefix_info *pinfo, u32 pid, u32 seq, 3783 int event, unsigned int flags) 3784 { 3785 struct prefixmsg *pmsg; 3786 struct nlmsghdr *nlh; 3787 struct prefix_cacheinfo ci; 3788 3789 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3790 if (nlh == NULL) 3791 return -EMSGSIZE; 3792 3793 pmsg = nlmsg_data(nlh); 3794 pmsg->prefix_family = AF_INET6; 3795 pmsg->prefix_pad1 = 0; 3796 pmsg->prefix_pad2 = 0; 3797 pmsg->prefix_ifindex = idev->dev->ifindex; 3798 pmsg->prefix_len = pinfo->prefix_len; 3799 pmsg->prefix_type = pinfo->type; 3800 pmsg->prefix_pad3 = 0; 3801 pmsg->prefix_flags = 0; 3802 if (pinfo->onlink) 3803 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3804 if (pinfo->autoconf) 3805 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3806 3807 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3808 3809 ci.preferred_time = ntohl(pinfo->prefered); 3810 ci.valid_time = ntohl(pinfo->valid); 3811 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3812 3813 return nlmsg_end(skb, nlh); 3814 3815 nla_put_failure: 3816 nlmsg_cancel(skb, nlh); 3817 return -EMSGSIZE; 3818 } 3819 3820 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3821 struct prefix_info *pinfo) 3822 { 3823 struct sk_buff *skb; 3824 struct net *net = dev_net(idev->dev); 3825 int err = -ENOBUFS; 3826 3827 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3828 if (skb == NULL) 3829 goto errout; 3830 3831 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3832 if (err < 0) { 3833 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3834 WARN_ON(err == -EMSGSIZE); 3835 kfree_skb(skb); 3836 goto errout; 3837 } 3838 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3839 errout: 3840 if (err < 0) 3841 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3842 } 3843 3844 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3845 { 3846 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3847 3848 switch (event) { 3849 case RTM_NEWADDR: 3850 /* 3851 * If the address was optimistic 3852 * we inserted the route at the start of 3853 * our DAD process, so we don't need 3854 * to do it again 3855 */ 3856 if (!(ifp->rt->rt6i_node)) 3857 ip6_ins_rt(ifp->rt); 3858 if (ifp->idev->cnf.forwarding) 3859 addrconf_join_anycast(ifp); 3860 break; 3861 case RTM_DELADDR: 3862 if (ifp->idev->cnf.forwarding) 3863 addrconf_leave_anycast(ifp); 3864 addrconf_leave_solict(ifp->idev, &ifp->addr); 3865 dst_hold(&ifp->rt->u.dst); 3866 if (ip6_del_rt(ifp->rt)) 3867 dst_free(&ifp->rt->u.dst); 3868 break; 3869 } 3870 } 3871 3872 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3873 { 3874 rcu_read_lock_bh(); 3875 if (likely(ifp->idev->dead == 0)) 3876 __ipv6_ifa_notify(event, ifp); 3877 rcu_read_unlock_bh(); 3878 } 3879 3880 #ifdef CONFIG_SYSCTL 3881 3882 static 3883 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3884 void __user *buffer, size_t *lenp, loff_t *ppos) 3885 { 3886 int *valp = ctl->data; 3887 int val = *valp; 3888 int ret; 3889 3890 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3891 3892 if (write) 3893 addrconf_fixup_forwarding(ctl, valp, val); 3894 return ret; 3895 } 3896 3897 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3898 int __user *name, int nlen, 3899 void __user *oldval, 3900 size_t __user *oldlenp, 3901 void __user *newval, size_t newlen) 3902 { 3903 int *valp = table->data; 3904 int val = *valp; 3905 int new; 3906 3907 if (!newval || !newlen) 3908 return 0; 3909 if (newlen != sizeof(int)) 3910 return -EINVAL; 3911 if (get_user(new, (int __user *)newval)) 3912 return -EFAULT; 3913 if (new == *valp) 3914 return 0; 3915 if (oldval && oldlenp) { 3916 size_t len; 3917 if (get_user(len, oldlenp)) 3918 return -EFAULT; 3919 if (len) { 3920 if (len > table->maxlen) 3921 len = table->maxlen; 3922 if (copy_to_user(oldval, valp, len)) 3923 return -EFAULT; 3924 if (put_user(len, oldlenp)) 3925 return -EFAULT; 3926 } 3927 } 3928 3929 *valp = new; 3930 addrconf_fixup_forwarding(table, valp, val); 3931 return 1; 3932 } 3933 3934 static struct addrconf_sysctl_table 3935 { 3936 struct ctl_table_header *sysctl_header; 3937 ctl_table addrconf_vars[DEVCONF_MAX+1]; 3938 char *dev_name; 3939 } addrconf_sysctl __read_mostly = { 3940 .sysctl_header = NULL, 3941 .addrconf_vars = { 3942 { 3943 .ctl_name = NET_IPV6_FORWARDING, 3944 .procname = "forwarding", 3945 .data = &ipv6_devconf.forwarding, 3946 .maxlen = sizeof(int), 3947 .mode = 0644, 3948 .proc_handler = &addrconf_sysctl_forward, 3949 .strategy = &addrconf_sysctl_forward_strategy, 3950 }, 3951 { 3952 .ctl_name = NET_IPV6_HOP_LIMIT, 3953 .procname = "hop_limit", 3954 .data = &ipv6_devconf.hop_limit, 3955 .maxlen = sizeof(int), 3956 .mode = 0644, 3957 .proc_handler = proc_dointvec, 3958 }, 3959 { 3960 .ctl_name = NET_IPV6_MTU, 3961 .procname = "mtu", 3962 .data = &ipv6_devconf.mtu6, 3963 .maxlen = sizeof(int), 3964 .mode = 0644, 3965 .proc_handler = &proc_dointvec, 3966 }, 3967 { 3968 .ctl_name = NET_IPV6_ACCEPT_RA, 3969 .procname = "accept_ra", 3970 .data = &ipv6_devconf.accept_ra, 3971 .maxlen = sizeof(int), 3972 .mode = 0644, 3973 .proc_handler = &proc_dointvec, 3974 }, 3975 { 3976 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3977 .procname = "accept_redirects", 3978 .data = &ipv6_devconf.accept_redirects, 3979 .maxlen = sizeof(int), 3980 .mode = 0644, 3981 .proc_handler = &proc_dointvec, 3982 }, 3983 { 3984 .ctl_name = NET_IPV6_AUTOCONF, 3985 .procname = "autoconf", 3986 .data = &ipv6_devconf.autoconf, 3987 .maxlen = sizeof(int), 3988 .mode = 0644, 3989 .proc_handler = &proc_dointvec, 3990 }, 3991 { 3992 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3993 .procname = "dad_transmits", 3994 .data = &ipv6_devconf.dad_transmits, 3995 .maxlen = sizeof(int), 3996 .mode = 0644, 3997 .proc_handler = &proc_dointvec, 3998 }, 3999 { 4000 .ctl_name = NET_IPV6_RTR_SOLICITS, 4001 .procname = "router_solicitations", 4002 .data = &ipv6_devconf.rtr_solicits, 4003 .maxlen = sizeof(int), 4004 .mode = 0644, 4005 .proc_handler = &proc_dointvec, 4006 }, 4007 { 4008 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 4009 .procname = "router_solicitation_interval", 4010 .data = &ipv6_devconf.rtr_solicit_interval, 4011 .maxlen = sizeof(int), 4012 .mode = 0644, 4013 .proc_handler = &proc_dointvec_jiffies, 4014 .strategy = &sysctl_jiffies, 4015 }, 4016 { 4017 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 4018 .procname = "router_solicitation_delay", 4019 .data = &ipv6_devconf.rtr_solicit_delay, 4020 .maxlen = sizeof(int), 4021 .mode = 0644, 4022 .proc_handler = &proc_dointvec_jiffies, 4023 .strategy = &sysctl_jiffies, 4024 }, 4025 { 4026 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 4027 .procname = "force_mld_version", 4028 .data = &ipv6_devconf.force_mld_version, 4029 .maxlen = sizeof(int), 4030 .mode = 0644, 4031 .proc_handler = &proc_dointvec, 4032 }, 4033 #ifdef CONFIG_IPV6_PRIVACY 4034 { 4035 .ctl_name = NET_IPV6_USE_TEMPADDR, 4036 .procname = "use_tempaddr", 4037 .data = &ipv6_devconf.use_tempaddr, 4038 .maxlen = sizeof(int), 4039 .mode = 0644, 4040 .proc_handler = &proc_dointvec, 4041 }, 4042 { 4043 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 4044 .procname = "temp_valid_lft", 4045 .data = &ipv6_devconf.temp_valid_lft, 4046 .maxlen = sizeof(int), 4047 .mode = 0644, 4048 .proc_handler = &proc_dointvec, 4049 }, 4050 { 4051 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 4052 .procname = "temp_prefered_lft", 4053 .data = &ipv6_devconf.temp_prefered_lft, 4054 .maxlen = sizeof(int), 4055 .mode = 0644, 4056 .proc_handler = &proc_dointvec, 4057 }, 4058 { 4059 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4060 .procname = "regen_max_retry", 4061 .data = &ipv6_devconf.regen_max_retry, 4062 .maxlen = sizeof(int), 4063 .mode = 0644, 4064 .proc_handler = &proc_dointvec, 4065 }, 4066 { 4067 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4068 .procname = "max_desync_factor", 4069 .data = &ipv6_devconf.max_desync_factor, 4070 .maxlen = sizeof(int), 4071 .mode = 0644, 4072 .proc_handler = &proc_dointvec, 4073 }, 4074 #endif 4075 { 4076 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4077 .procname = "max_addresses", 4078 .data = &ipv6_devconf.max_addresses, 4079 .maxlen = sizeof(int), 4080 .mode = 0644, 4081 .proc_handler = &proc_dointvec, 4082 }, 4083 { 4084 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4085 .procname = "accept_ra_defrtr", 4086 .data = &ipv6_devconf.accept_ra_defrtr, 4087 .maxlen = sizeof(int), 4088 .mode = 0644, 4089 .proc_handler = &proc_dointvec, 4090 }, 4091 { 4092 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4093 .procname = "accept_ra_pinfo", 4094 .data = &ipv6_devconf.accept_ra_pinfo, 4095 .maxlen = sizeof(int), 4096 .mode = 0644, 4097 .proc_handler = &proc_dointvec, 4098 }, 4099 #ifdef CONFIG_IPV6_ROUTER_PREF 4100 { 4101 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4102 .procname = "accept_ra_rtr_pref", 4103 .data = &ipv6_devconf.accept_ra_rtr_pref, 4104 .maxlen = sizeof(int), 4105 .mode = 0644, 4106 .proc_handler = &proc_dointvec, 4107 }, 4108 { 4109 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4110 .procname = "router_probe_interval", 4111 .data = &ipv6_devconf.rtr_probe_interval, 4112 .maxlen = sizeof(int), 4113 .mode = 0644, 4114 .proc_handler = &proc_dointvec_jiffies, 4115 .strategy = &sysctl_jiffies, 4116 }, 4117 #ifdef CONFIG_IPV6_ROUTE_INFO 4118 { 4119 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4120 .procname = "accept_ra_rt_info_max_plen", 4121 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4122 .maxlen = sizeof(int), 4123 .mode = 0644, 4124 .proc_handler = &proc_dointvec, 4125 }, 4126 #endif 4127 #endif 4128 { 4129 .ctl_name = NET_IPV6_PROXY_NDP, 4130 .procname = "proxy_ndp", 4131 .data = &ipv6_devconf.proxy_ndp, 4132 .maxlen = sizeof(int), 4133 .mode = 0644, 4134 .proc_handler = &proc_dointvec, 4135 }, 4136 { 4137 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4138 .procname = "accept_source_route", 4139 .data = &ipv6_devconf.accept_source_route, 4140 .maxlen = sizeof(int), 4141 .mode = 0644, 4142 .proc_handler = &proc_dointvec, 4143 }, 4144 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4145 { 4146 .ctl_name = CTL_UNNUMBERED, 4147 .procname = "optimistic_dad", 4148 .data = &ipv6_devconf.optimistic_dad, 4149 .maxlen = sizeof(int), 4150 .mode = 0644, 4151 .proc_handler = &proc_dointvec, 4152 4153 }, 4154 #endif 4155 #ifdef CONFIG_IPV6_MROUTE 4156 { 4157 .ctl_name = CTL_UNNUMBERED, 4158 .procname = "mc_forwarding", 4159 .data = &ipv6_devconf.mc_forwarding, 4160 .maxlen = sizeof(int), 4161 .mode = 0644, 4162 .proc_handler = &proc_dointvec, 4163 }, 4164 #endif 4165 { 4166 .ctl_name = 0, /* sentinel */ 4167 } 4168 }, 4169 }; 4170 4171 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4172 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4173 { 4174 int i; 4175 struct addrconf_sysctl_table *t; 4176 4177 #define ADDRCONF_CTL_PATH_DEV 3 4178 4179 struct ctl_path addrconf_ctl_path[] = { 4180 { .procname = "net", .ctl_name = CTL_NET, }, 4181 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4182 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4183 { /* to be set */ }, 4184 { }, 4185 }; 4186 4187 4188 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4189 if (t == NULL) 4190 goto out; 4191 4192 for (i=0; t->addrconf_vars[i].data; i++) { 4193 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4194 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4195 t->addrconf_vars[i].extra2 = net; 4196 } 4197 4198 /* 4199 * Make a copy of dev_name, because '.procname' is regarded as const 4200 * by sysctl and we wouldn't want anyone to change it under our feet 4201 * (see SIOCSIFNAME). 4202 */ 4203 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4204 if (!t->dev_name) 4205 goto free; 4206 4207 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4208 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4209 4210 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4211 t->addrconf_vars); 4212 if (t->sysctl_header == NULL) 4213 goto free_procname; 4214 4215 p->sysctl = t; 4216 return 0; 4217 4218 free_procname: 4219 kfree(t->dev_name); 4220 free: 4221 kfree(t); 4222 out: 4223 return -ENOBUFS; 4224 } 4225 4226 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4227 { 4228 struct addrconf_sysctl_table *t; 4229 4230 if (p->sysctl == NULL) 4231 return; 4232 4233 t = p->sysctl; 4234 p->sysctl = NULL; 4235 unregister_sysctl_table(t->sysctl_header); 4236 kfree(t->dev_name); 4237 kfree(t); 4238 } 4239 4240 static void addrconf_sysctl_register(struct inet6_dev *idev) 4241 { 4242 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4243 NET_IPV6_NEIGH, "ipv6", 4244 &ndisc_ifinfo_sysctl_change, 4245 NULL); 4246 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4247 idev->dev->ifindex, idev, &idev->cnf); 4248 } 4249 4250 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4251 { 4252 __addrconf_sysctl_unregister(&idev->cnf); 4253 neigh_sysctl_unregister(idev->nd_parms); 4254 } 4255 4256 4257 #endif 4258 4259 static int addrconf_init_net(struct net *net) 4260 { 4261 int err; 4262 struct ipv6_devconf *all, *dflt; 4263 4264 err = -ENOMEM; 4265 all = &ipv6_devconf; 4266 dflt = &ipv6_devconf_dflt; 4267 4268 if (net != &init_net) { 4269 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4270 if (all == NULL) 4271 goto err_alloc_all; 4272 4273 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4274 if (dflt == NULL) 4275 goto err_alloc_dflt; 4276 } 4277 4278 net->ipv6.devconf_all = all; 4279 net->ipv6.devconf_dflt = dflt; 4280 4281 #ifdef CONFIG_SYSCTL 4282 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4283 NULL, all); 4284 if (err < 0) 4285 goto err_reg_all; 4286 4287 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4288 NULL, dflt); 4289 if (err < 0) 4290 goto err_reg_dflt; 4291 #endif 4292 return 0; 4293 4294 #ifdef CONFIG_SYSCTL 4295 err_reg_dflt: 4296 __addrconf_sysctl_unregister(all); 4297 err_reg_all: 4298 kfree(dflt); 4299 #endif 4300 err_alloc_dflt: 4301 kfree(all); 4302 err_alloc_all: 4303 return err; 4304 } 4305 4306 static void addrconf_exit_net(struct net *net) 4307 { 4308 #ifdef CONFIG_SYSCTL 4309 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4310 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4311 #endif 4312 if (net != &init_net) { 4313 kfree(net->ipv6.devconf_dflt); 4314 kfree(net->ipv6.devconf_all); 4315 } 4316 } 4317 4318 static struct pernet_operations addrconf_ops = { 4319 .init = addrconf_init_net, 4320 .exit = addrconf_exit_net, 4321 }; 4322 4323 /* 4324 * Device notifier 4325 */ 4326 4327 int register_inet6addr_notifier(struct notifier_block *nb) 4328 { 4329 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4330 } 4331 4332 EXPORT_SYMBOL(register_inet6addr_notifier); 4333 4334 int unregister_inet6addr_notifier(struct notifier_block *nb) 4335 { 4336 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4337 } 4338 4339 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4340 4341 4342 static int addrconf_net_init(struct net *net) 4343 { 4344 return 0; 4345 } 4346 4347 static void addrconf_net_exit(struct net *net) 4348 { 4349 struct net_device *dev; 4350 4351 rtnl_lock(); 4352 /* clean dev list */ 4353 for_each_netdev(net, dev) { 4354 if (__in6_dev_get(dev) == NULL) 4355 continue; 4356 addrconf_ifdown(dev, 1); 4357 } 4358 addrconf_ifdown(net->loopback_dev, 2); 4359 rtnl_unlock(); 4360 } 4361 4362 static struct pernet_operations addrconf_net_ops = { 4363 .init = addrconf_net_init, 4364 .exit = addrconf_net_exit, 4365 }; 4366 4367 /* 4368 * Init / cleanup code 4369 */ 4370 4371 int __init addrconf_init(void) 4372 { 4373 int err; 4374 4375 if ((err = ipv6_addr_label_init()) < 0) { 4376 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4377 err); 4378 return err; 4379 } 4380 4381 register_pernet_subsys(&addrconf_ops); 4382 4383 /* The addrconf netdev notifier requires that loopback_dev 4384 * has it's ipv6 private information allocated and setup 4385 * before it can bring up and give link-local addresses 4386 * to other devices which are up. 4387 * 4388 * Unfortunately, loopback_dev is not necessarily the first 4389 * entry in the global dev_base list of net devices. In fact, 4390 * it is likely to be the very last entry on that list. 4391 * So this causes the notifier registry below to try and 4392 * give link-local addresses to all devices besides loopback_dev 4393 * first, then loopback_dev, which cases all the non-loopback_dev 4394 * devices to fail to get a link-local address. 4395 * 4396 * So, as a temporary fix, allocate the ipv6 structure for 4397 * loopback_dev first by hand. 4398 * Longer term, all of the dependencies ipv6 has upon the loopback 4399 * device and it being up should be removed. 4400 */ 4401 rtnl_lock(); 4402 if (!ipv6_add_dev(init_net.loopback_dev)) 4403 err = -ENOMEM; 4404 rtnl_unlock(); 4405 if (err) 4406 goto errlo; 4407 4408 err = register_pernet_device(&addrconf_net_ops); 4409 if (err) 4410 return err; 4411 4412 register_netdevice_notifier(&ipv6_dev_notf); 4413 4414 addrconf_verify(0); 4415 4416 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4417 if (err < 0) 4418 goto errout; 4419 4420 /* Only the first call to __rtnl_register can fail */ 4421 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4422 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4423 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4424 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4425 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4426 4427 ipv6_addr_label_rtnl_register(); 4428 4429 return 0; 4430 errout: 4431 unregister_netdevice_notifier(&ipv6_dev_notf); 4432 errlo: 4433 unregister_pernet_subsys(&addrconf_ops); 4434 4435 return err; 4436 } 4437 4438 void addrconf_cleanup(void) 4439 { 4440 struct inet6_ifaddr *ifa; 4441 int i; 4442 4443 unregister_netdevice_notifier(&ipv6_dev_notf); 4444 unregister_pernet_device(&addrconf_net_ops); 4445 4446 unregister_pernet_subsys(&addrconf_ops); 4447 4448 rtnl_lock(); 4449 4450 /* 4451 * Check hash table. 4452 */ 4453 write_lock_bh(&addrconf_hash_lock); 4454 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4455 for (ifa=inet6_addr_lst[i]; ifa; ) { 4456 struct inet6_ifaddr *bifa; 4457 4458 bifa = ifa; 4459 ifa = ifa->lst_next; 4460 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4461 /* Do not free it; something is wrong. 4462 Now we can investigate it with debugger. 4463 */ 4464 } 4465 } 4466 write_unlock_bh(&addrconf_hash_lock); 4467 4468 del_timer(&addr_chk_timer); 4469 rtnl_unlock(); 4470 4471 unregister_pernet_subsys(&addrconf_net_ops); 4472 } 4473