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 #ifdef CONFIG_IPV6_PRIVACY 376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 377 if ((dev->flags&IFF_LOOPBACK) || 378 dev->type == ARPHRD_TUNNEL || 379 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 380 dev->type == ARPHRD_SIT || 381 #endif 382 dev->type == ARPHRD_NONE) { 383 printk(KERN_INFO 384 "%s: Disabled Privacy Extensions\n", 385 dev->name); 386 ndev->cnf.use_tempaddr = -1; 387 388 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 389 printk(KERN_INFO 390 "%s: Disabled Multicast RS\n", 391 dev->name); 392 ndev->cnf.rtr_solicits = 0; 393 } 394 } else { 395 in6_dev_hold(ndev); 396 ipv6_regen_rndid((unsigned long) ndev); 397 } 398 #endif 399 400 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 401 ndev->if_flags |= IF_READY; 402 403 ipv6_mc_init_dev(ndev); 404 ndev->tstamp = jiffies; 405 addrconf_sysctl_register(ndev); 406 /* protected by rtnl_lock */ 407 rcu_assign_pointer(dev->ip6_ptr, ndev); 408 409 /* Join all-node multicast group */ 410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 411 412 return ndev; 413 } 414 415 struct inet6_dev * ipv6_find_idev(struct net_device *dev) 416 { 417 struct inet6_dev *idev; 418 419 ASSERT_RTNL(); 420 421 if ((idev = __in6_dev_get(dev)) == NULL) { 422 if ((idev = ipv6_add_dev(dev)) == NULL) 423 return NULL; 424 } 425 426 if (dev->flags&IFF_UP) 427 ipv6_mc_up(idev); 428 return idev; 429 } 430 431 #ifdef CONFIG_SYSCTL 432 static void dev_forward_change(struct inet6_dev *idev) 433 { 434 struct net_device *dev; 435 struct inet6_ifaddr *ifa; 436 437 if (!idev) 438 return; 439 dev = idev->dev; 440 if (dev && (dev->flags & IFF_MULTICAST)) { 441 if (idev->cnf.forwarding) 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 443 else 444 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 445 } 446 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 447 if (ifa->flags&IFA_F_TENTATIVE) 448 continue; 449 if (idev->cnf.forwarding) 450 addrconf_join_anycast(ifa); 451 else 452 addrconf_leave_anycast(ifa); 453 } 454 } 455 456 457 static void addrconf_forward_change(struct net *net, __s32 newf) 458 { 459 struct net_device *dev; 460 struct inet6_dev *idev; 461 462 read_lock(&dev_base_lock); 463 for_each_netdev(net, dev) { 464 rcu_read_lock(); 465 idev = __in6_dev_get(dev); 466 if (idev) { 467 int changed = (!idev->cnf.forwarding) ^ (!newf); 468 idev->cnf.forwarding = newf; 469 if (changed) 470 dev_forward_change(idev); 471 } 472 rcu_read_unlock(); 473 } 474 read_unlock(&dev_base_lock); 475 } 476 477 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 478 { 479 struct net *net; 480 481 net = (struct net *)table->extra2; 482 if (p == &net->ipv6.devconf_dflt->forwarding) 483 return; 484 485 if (p == &net->ipv6.devconf_all->forwarding) { 486 __s32 newf = net->ipv6.devconf_all->forwarding; 487 net->ipv6.devconf_dflt->forwarding = newf; 488 addrconf_forward_change(net, newf); 489 } else if ((!*p) ^ (!old)) 490 dev_forward_change((struct inet6_dev *)table->extra1); 491 492 if (*p) 493 rt6_purge_dflt_routers(net); 494 } 495 #endif 496 497 /* Nobody refers to this ifaddr, destroy it */ 498 499 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 500 { 501 BUG_TRAP(ifp->if_next==NULL); 502 BUG_TRAP(ifp->lst_next==NULL); 503 #ifdef NET_REFCNT_DEBUG 504 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 505 #endif 506 507 in6_dev_put(ifp->idev); 508 509 if (del_timer(&ifp->timer)) 510 printk("Timer is still running, when freeing ifa=%p\n", ifp); 511 512 if (!ifp->dead) { 513 printk("Freeing alive inet6 address %p\n", ifp); 514 return; 515 } 516 dst_release(&ifp->rt->u.dst); 517 518 kfree(ifp); 519 } 520 521 static void 522 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 523 { 524 struct inet6_ifaddr *ifa, **ifap; 525 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 526 527 /* 528 * Each device address list is sorted in order of scope - 529 * global before linklocal. 530 */ 531 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 532 ifap = &ifa->if_next) { 533 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 534 break; 535 } 536 537 ifp->if_next = *ifap; 538 *ifap = ifp; 539 } 540 541 /* 542 * Hash function taken from net_alias.c 543 */ 544 static u8 ipv6_addr_hash(const struct in6_addr *addr) 545 { 546 __u32 word; 547 548 /* 549 * We perform the hash function over the last 64 bits of the address 550 * This will include the IEEE address token on links that support it. 551 */ 552 553 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 554 word ^= (word >> 16); 555 word ^= (word >> 8); 556 557 return ((word ^ (word >> 4)) & 0x0f); 558 } 559 560 /* On success it returns ifp with increased reference count */ 561 562 static struct inet6_ifaddr * 563 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 564 int scope, u32 flags) 565 { 566 struct inet6_ifaddr *ifa = NULL; 567 struct rt6_info *rt; 568 int hash; 569 int err = 0; 570 571 rcu_read_lock_bh(); 572 if (idev->dead) { 573 err = -ENODEV; /*XXX*/ 574 goto out2; 575 } 576 577 write_lock(&addrconf_hash_lock); 578 579 /* Ignore adding duplicate addresses on an interface */ 580 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 581 ADBG(("ipv6_add_addr: already assigned\n")); 582 err = -EEXIST; 583 goto out; 584 } 585 586 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 587 588 if (ifa == NULL) { 589 ADBG(("ipv6_add_addr: malloc failed\n")); 590 err = -ENOBUFS; 591 goto out; 592 } 593 594 rt = addrconf_dst_alloc(idev, addr, 0); 595 if (IS_ERR(rt)) { 596 err = PTR_ERR(rt); 597 goto out; 598 } 599 600 ipv6_addr_copy(&ifa->addr, addr); 601 602 spin_lock_init(&ifa->lock); 603 init_timer(&ifa->timer); 604 ifa->timer.data = (unsigned long) ifa; 605 ifa->scope = scope; 606 ifa->prefix_len = pfxlen; 607 ifa->flags = flags | IFA_F_TENTATIVE; 608 ifa->cstamp = ifa->tstamp = jiffies; 609 610 ifa->rt = rt; 611 612 /* 613 * part one of RFC 4429, section 3.3 614 * We should not configure an address as 615 * optimistic if we do not yet know the link 616 * layer address of our nexhop router 617 */ 618 619 if (rt->rt6i_nexthop == NULL) 620 ifa->flags &= ~IFA_F_OPTIMISTIC; 621 622 ifa->idev = idev; 623 in6_dev_hold(idev); 624 /* For caller */ 625 in6_ifa_hold(ifa); 626 627 /* Add to big hash table */ 628 hash = ipv6_addr_hash(addr); 629 630 ifa->lst_next = inet6_addr_lst[hash]; 631 inet6_addr_lst[hash] = ifa; 632 in6_ifa_hold(ifa); 633 write_unlock(&addrconf_hash_lock); 634 635 write_lock(&idev->lock); 636 /* Add to inet6_dev unicast addr list. */ 637 ipv6_link_dev_addr(idev, ifa); 638 639 #ifdef CONFIG_IPV6_PRIVACY 640 if (ifa->flags&IFA_F_TEMPORARY) { 641 ifa->tmp_next = idev->tempaddr_list; 642 idev->tempaddr_list = ifa; 643 in6_ifa_hold(ifa); 644 } 645 #endif 646 647 in6_ifa_hold(ifa); 648 write_unlock(&idev->lock); 649 out2: 650 rcu_read_unlock_bh(); 651 652 if (likely(err == 0)) 653 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 654 else { 655 kfree(ifa); 656 ifa = ERR_PTR(err); 657 } 658 659 return ifa; 660 out: 661 write_unlock(&addrconf_hash_lock); 662 goto out2; 663 } 664 665 /* This function wants to get referenced ifp and releases it before return */ 666 667 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 668 { 669 struct inet6_ifaddr *ifa, **ifap; 670 struct inet6_dev *idev = ifp->idev; 671 int hash; 672 int deleted = 0, onlink = 0; 673 unsigned long expires = jiffies; 674 675 hash = ipv6_addr_hash(&ifp->addr); 676 677 ifp->dead = 1; 678 679 write_lock_bh(&addrconf_hash_lock); 680 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 681 ifap = &ifa->lst_next) { 682 if (ifa == ifp) { 683 *ifap = ifa->lst_next; 684 __in6_ifa_put(ifp); 685 ifa->lst_next = NULL; 686 break; 687 } 688 } 689 write_unlock_bh(&addrconf_hash_lock); 690 691 write_lock_bh(&idev->lock); 692 #ifdef CONFIG_IPV6_PRIVACY 693 if (ifp->flags&IFA_F_TEMPORARY) { 694 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 695 ifap = &ifa->tmp_next) { 696 if (ifa == ifp) { 697 *ifap = ifa->tmp_next; 698 if (ifp->ifpub) { 699 in6_ifa_put(ifp->ifpub); 700 ifp->ifpub = NULL; 701 } 702 __in6_ifa_put(ifp); 703 ifa->tmp_next = NULL; 704 break; 705 } 706 } 707 } 708 #endif 709 710 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 711 if (ifa == ifp) { 712 *ifap = ifa->if_next; 713 __in6_ifa_put(ifp); 714 ifa->if_next = NULL; 715 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 716 break; 717 deleted = 1; 718 continue; 719 } else if (ifp->flags & IFA_F_PERMANENT) { 720 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 721 ifp->prefix_len)) { 722 if (ifa->flags & IFA_F_PERMANENT) { 723 onlink = 1; 724 if (deleted) 725 break; 726 } else { 727 unsigned long lifetime; 728 729 if (!onlink) 730 onlink = -1; 731 732 spin_lock(&ifa->lock); 733 lifetime = min_t(unsigned long, 734 ifa->valid_lft, 0x7fffffffUL/HZ); 735 if (time_before(expires, 736 ifa->tstamp + lifetime * HZ)) 737 expires = ifa->tstamp + lifetime * HZ; 738 spin_unlock(&ifa->lock); 739 } 740 } 741 } 742 ifap = &ifa->if_next; 743 } 744 write_unlock_bh(&idev->lock); 745 746 ipv6_ifa_notify(RTM_DELADDR, ifp); 747 748 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 749 750 addrconf_del_timer(ifp); 751 752 /* 753 * Purge or update corresponding prefix 754 * 755 * 1) we don't purge prefix here if address was not permanent. 756 * prefix is managed by its own lifetime. 757 * 2) if there're no addresses, delete prefix. 758 * 3) if there're still other permanent address(es), 759 * corresponding prefix is still permanent. 760 * 4) otherwise, update prefix lifetime to the 761 * longest valid lifetime among the corresponding 762 * addresses on the device. 763 * Note: subsequent RA will update lifetime. 764 * 765 * --yoshfuji 766 */ 767 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 768 struct in6_addr prefix; 769 struct rt6_info *rt; 770 struct net *net = dev_net(ifp->idev->dev); 771 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 772 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 773 774 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 775 if (onlink == 0) { 776 ip6_del_rt(rt); 777 rt = NULL; 778 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 779 rt->rt6i_expires = expires; 780 rt->rt6i_flags |= RTF_EXPIRES; 781 } 782 } 783 dst_release(&rt->u.dst); 784 } 785 786 in6_ifa_put(ifp); 787 } 788 789 #ifdef CONFIG_IPV6_PRIVACY 790 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 791 { 792 struct inet6_dev *idev = ifp->idev; 793 struct in6_addr addr, *tmpaddr; 794 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 795 unsigned long regen_advance; 796 int tmp_plen; 797 int ret = 0; 798 int max_addresses; 799 u32 addr_flags; 800 801 write_lock(&idev->lock); 802 if (ift) { 803 spin_lock_bh(&ift->lock); 804 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 805 spin_unlock_bh(&ift->lock); 806 tmpaddr = &addr; 807 } else { 808 tmpaddr = NULL; 809 } 810 retry: 811 in6_dev_hold(idev); 812 if (idev->cnf.use_tempaddr <= 0) { 813 write_unlock(&idev->lock); 814 printk(KERN_INFO 815 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 816 in6_dev_put(idev); 817 ret = -1; 818 goto out; 819 } 820 spin_lock_bh(&ifp->lock); 821 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 822 idev->cnf.use_tempaddr = -1; /*XXX*/ 823 spin_unlock_bh(&ifp->lock); 824 write_unlock(&idev->lock); 825 printk(KERN_WARNING 826 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 827 in6_dev_put(idev); 828 ret = -1; 829 goto out; 830 } 831 in6_ifa_hold(ifp); 832 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 833 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 834 spin_unlock_bh(&ifp->lock); 835 write_unlock(&idev->lock); 836 printk(KERN_WARNING 837 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 838 in6_ifa_put(ifp); 839 in6_dev_put(idev); 840 ret = -1; 841 goto out; 842 } 843 memcpy(&addr.s6_addr[8], idev->rndid, 8); 844 tmp_valid_lft = min_t(__u32, 845 ifp->valid_lft, 846 idev->cnf.temp_valid_lft); 847 tmp_prefered_lft = min_t(__u32, 848 ifp->prefered_lft, 849 idev->cnf.temp_prefered_lft - desync_factor / HZ); 850 tmp_plen = ifp->prefix_len; 851 max_addresses = idev->cnf.max_addresses; 852 tmp_cstamp = ifp->cstamp; 853 tmp_tstamp = ifp->tstamp; 854 spin_unlock_bh(&ifp->lock); 855 856 regen_advance = idev->cnf.regen_max_retry * 857 idev->cnf.dad_transmits * 858 idev->nd_parms->retrans_time / HZ; 859 write_unlock(&idev->lock); 860 861 /* A temporary address is created only if this calculated Preferred 862 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 863 * an implementation must not create a temporary address with a zero 864 * Preferred Lifetime. 865 */ 866 if (tmp_prefered_lft <= regen_advance) { 867 in6_ifa_put(ifp); 868 in6_dev_put(idev); 869 ret = -1; 870 goto out; 871 } 872 873 addr_flags = IFA_F_TEMPORARY; 874 /* set in addrconf_prefix_rcv() */ 875 if (ifp->flags & IFA_F_OPTIMISTIC) 876 addr_flags |= IFA_F_OPTIMISTIC; 877 878 ift = !max_addresses || 879 ipv6_count_addresses(idev) < max_addresses ? 880 ipv6_add_addr(idev, &addr, tmp_plen, 881 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 882 addr_flags) : NULL; 883 if (!ift || IS_ERR(ift)) { 884 in6_ifa_put(ifp); 885 in6_dev_put(idev); 886 printk(KERN_INFO 887 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 888 tmpaddr = &addr; 889 write_lock(&idev->lock); 890 goto retry; 891 } 892 893 spin_lock_bh(&ift->lock); 894 ift->ifpub = ifp; 895 ift->valid_lft = tmp_valid_lft; 896 ift->prefered_lft = tmp_prefered_lft; 897 ift->cstamp = tmp_cstamp; 898 ift->tstamp = tmp_tstamp; 899 spin_unlock_bh(&ift->lock); 900 901 addrconf_dad_start(ift, 0); 902 in6_ifa_put(ift); 903 in6_dev_put(idev); 904 out: 905 return ret; 906 } 907 #endif 908 909 /* 910 * Choose an appropriate source address (RFC3484) 911 */ 912 enum { 913 IPV6_SADDR_RULE_INIT = 0, 914 IPV6_SADDR_RULE_LOCAL, 915 IPV6_SADDR_RULE_SCOPE, 916 IPV6_SADDR_RULE_PREFERRED, 917 #ifdef CONFIG_IPV6_MIP6 918 IPV6_SADDR_RULE_HOA, 919 #endif 920 IPV6_SADDR_RULE_OIF, 921 IPV6_SADDR_RULE_LABEL, 922 #ifdef CONFIG_IPV6_PRIVACY 923 IPV6_SADDR_RULE_PRIVACY, 924 #endif 925 IPV6_SADDR_RULE_ORCHID, 926 IPV6_SADDR_RULE_PREFIX, 927 IPV6_SADDR_RULE_MAX 928 }; 929 930 struct ipv6_saddr_score { 931 int rule; 932 int addr_type; 933 struct inet6_ifaddr *ifa; 934 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 935 int scopedist; 936 int matchlen; 937 }; 938 939 struct ipv6_saddr_dst { 940 const struct in6_addr *addr; 941 int ifindex; 942 int scope; 943 int label; 944 unsigned int prefs; 945 }; 946 947 static inline int ipv6_saddr_preferred(int type) 948 { 949 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 950 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 951 return 1; 952 return 0; 953 } 954 955 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score, 956 struct ipv6_saddr_dst *dst, 957 int i) 958 { 959 int ret; 960 961 if (i <= score->rule) { 962 switch (i) { 963 case IPV6_SADDR_RULE_SCOPE: 964 ret = score->scopedist; 965 break; 966 case IPV6_SADDR_RULE_PREFIX: 967 ret = score->matchlen; 968 break; 969 default: 970 ret = !!test_bit(i, score->scorebits); 971 } 972 goto out; 973 } 974 975 switch (i) { 976 case IPV6_SADDR_RULE_INIT: 977 /* Rule 0: remember if hiscore is not ready yet */ 978 ret = !!score->ifa; 979 break; 980 case IPV6_SADDR_RULE_LOCAL: 981 /* Rule 1: Prefer same address */ 982 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 983 break; 984 case IPV6_SADDR_RULE_SCOPE: 985 /* Rule 2: Prefer appropriate scope 986 * 987 * ret 988 * ^ 989 * -1 | d 15 990 * ---+--+-+---> scope 991 * | 992 * | d is scope of the destination. 993 * B-d | \ 994 * | \ <- smaller scope is better if 995 * B-15 | \ if scope is enough for destinaion. 996 * | ret = B - scope (-1 <= scope >= d <= 15). 997 * d-C-1 | / 998 * |/ <- greater is better 999 * -C / if scope is not enough for destination. 1000 * /| ret = scope - C (-1 <= d < scope <= 15). 1001 * 1002 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1003 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1004 * Assume B = 0 and we get C > 29. 1005 */ 1006 ret = __ipv6_addr_src_scope(score->addr_type); 1007 if (ret >= dst->scope) 1008 ret = -ret; 1009 else 1010 ret -= 128; /* 30 is enough */ 1011 score->scopedist = ret; 1012 break; 1013 case IPV6_SADDR_RULE_PREFERRED: 1014 /* Rule 3: Avoid deprecated and optimistic addresses */ 1015 ret = ipv6_saddr_preferred(score->addr_type) || 1016 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1017 break; 1018 #ifdef CONFIG_IPV6_MIP6 1019 case IPV6_SADDR_RULE_HOA: 1020 { 1021 /* Rule 4: Prefer home address */ 1022 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1023 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1024 break; 1025 } 1026 #endif 1027 case IPV6_SADDR_RULE_OIF: 1028 /* Rule 5: Prefer outgoing interface */ 1029 ret = (!dst->ifindex || 1030 dst->ifindex == score->ifa->idev->dev->ifindex); 1031 break; 1032 case IPV6_SADDR_RULE_LABEL: 1033 /* Rule 6: Prefer matching label */ 1034 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type, 1035 score->ifa->idev->dev->ifindex) == dst->label; 1036 break; 1037 #ifdef CONFIG_IPV6_PRIVACY 1038 case IPV6_SADDR_RULE_PRIVACY: 1039 { 1040 /* Rule 7: Prefer public address 1041 * Note: prefer temprary address if use_tempaddr >= 2 1042 */ 1043 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1044 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1045 score->ifa->idev->cnf.use_tempaddr >= 2; 1046 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1047 break; 1048 } 1049 #endif 1050 case IPV6_SADDR_RULE_ORCHID: 1051 /* Rule 8-: Prefer ORCHID vs ORCHID or 1052 * non-ORCHID vs non-ORCHID 1053 */ 1054 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1055 ipv6_addr_orchid(dst->addr)); 1056 break; 1057 case IPV6_SADDR_RULE_PREFIX: 1058 /* Rule 8: Use longest matching prefix */ 1059 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1060 dst->addr); 1061 break; 1062 default: 1063 ret = 0; 1064 } 1065 1066 if (ret) 1067 __set_bit(i, score->scorebits); 1068 score->rule = i; 1069 out: 1070 return ret; 1071 } 1072 1073 int ipv6_dev_get_saddr(struct net_device *dst_dev, 1074 const struct in6_addr *daddr, unsigned int prefs, 1075 struct in6_addr *saddr) 1076 { 1077 struct ipv6_saddr_score scores[2], 1078 *score = &scores[0], *hiscore = &scores[1]; 1079 struct net *net = dev_net(dst_dev); 1080 struct ipv6_saddr_dst dst; 1081 struct net_device *dev; 1082 int dst_type; 1083 1084 dst_type = __ipv6_addr_type(daddr); 1085 dst.addr = daddr; 1086 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1087 dst.scope = __ipv6_addr_src_scope(dst_type); 1088 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex); 1089 dst.prefs = prefs; 1090 1091 hiscore->rule = -1; 1092 hiscore->ifa = NULL; 1093 1094 read_lock(&dev_base_lock); 1095 rcu_read_lock(); 1096 1097 for_each_netdev(net, dev) { 1098 struct inet6_dev *idev; 1099 1100 /* Candidate Source Address (section 4) 1101 * - multicast and link-local destination address, 1102 * the set of candidate source address MUST only 1103 * include addresses assigned to interfaces 1104 * belonging to the same link as the outgoing 1105 * interface. 1106 * (- For site-local destination addresses, the 1107 * set of candidate source addresses MUST only 1108 * include addresses assigned to interfaces 1109 * belonging to the same site as the outgoing 1110 * interface.) 1111 */ 1112 if (((dst_type & IPV6_ADDR_MULTICAST) || 1113 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1114 dst.ifindex && dev->ifindex != dst.ifindex) 1115 continue; 1116 1117 idev = __in6_dev_get(dev); 1118 if (!idev) 1119 continue; 1120 1121 read_lock_bh(&idev->lock); 1122 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1123 int i; 1124 1125 /* 1126 * - Tentative Address (RFC2462 section 5.4) 1127 * - A tentative address is not considered 1128 * "assigned to an interface" in the traditional 1129 * sense, unless it is also flagged as optimistic. 1130 * - Candidate Source Address (section 4) 1131 * - In any case, anycast addresses, multicast 1132 * addresses, and the unspecified address MUST 1133 * NOT be included in a candidate set. 1134 */ 1135 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1136 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1137 continue; 1138 1139 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1140 1141 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1142 score->addr_type & IPV6_ADDR_MULTICAST)) { 1143 LIMIT_NETDEBUG(KERN_DEBUG 1144 "ADDRCONF: unspecified / multicast address " 1145 "assigned as unicast address on %s", 1146 dev->name); 1147 continue; 1148 } 1149 1150 score->rule = -1; 1151 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1152 1153 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1154 int minihiscore, miniscore; 1155 1156 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i); 1157 miniscore = ipv6_get_saddr_eval(score, &dst, i); 1158 1159 if (minihiscore > miniscore) { 1160 if (i == IPV6_SADDR_RULE_SCOPE && 1161 score->scopedist > 0) { 1162 /* 1163 * special case: 1164 * each remaining entry 1165 * has too small (not enough) 1166 * scope, because ifa entries 1167 * are sorted by their scope 1168 * values. 1169 */ 1170 goto try_nextdev; 1171 } 1172 break; 1173 } else if (minihiscore < miniscore) { 1174 struct ipv6_saddr_score *tmp; 1175 1176 if (hiscore->ifa) 1177 in6_ifa_put(hiscore->ifa); 1178 1179 in6_ifa_hold(score->ifa); 1180 1181 tmp = hiscore; 1182 hiscore = score; 1183 score = tmp; 1184 1185 /* restore our iterator */ 1186 score->ifa = hiscore->ifa; 1187 1188 break; 1189 } 1190 } 1191 } 1192 try_nextdev: 1193 read_unlock_bh(&idev->lock); 1194 } 1195 rcu_read_unlock(); 1196 read_unlock(&dev_base_lock); 1197 1198 if (!hiscore->ifa) 1199 return -EADDRNOTAVAIL; 1200 1201 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1202 in6_ifa_put(hiscore->ifa); 1203 return 0; 1204 } 1205 1206 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1207 1208 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1209 unsigned char banned_flags) 1210 { 1211 struct inet6_dev *idev; 1212 int err = -EADDRNOTAVAIL; 1213 1214 rcu_read_lock(); 1215 if ((idev = __in6_dev_get(dev)) != NULL) { 1216 struct inet6_ifaddr *ifp; 1217 1218 read_lock_bh(&idev->lock); 1219 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1220 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1221 ipv6_addr_copy(addr, &ifp->addr); 1222 err = 0; 1223 break; 1224 } 1225 } 1226 read_unlock_bh(&idev->lock); 1227 } 1228 rcu_read_unlock(); 1229 return err; 1230 } 1231 1232 static int ipv6_count_addresses(struct inet6_dev *idev) 1233 { 1234 int cnt = 0; 1235 struct inet6_ifaddr *ifp; 1236 1237 read_lock_bh(&idev->lock); 1238 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1239 cnt++; 1240 read_unlock_bh(&idev->lock); 1241 return cnt; 1242 } 1243 1244 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1245 struct net_device *dev, int strict) 1246 { 1247 struct inet6_ifaddr * ifp; 1248 u8 hash = ipv6_addr_hash(addr); 1249 1250 read_lock_bh(&addrconf_hash_lock); 1251 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1252 if (!net_eq(dev_net(ifp->idev->dev), net)) 1253 continue; 1254 if (ipv6_addr_equal(&ifp->addr, addr) && 1255 !(ifp->flags&IFA_F_TENTATIVE)) { 1256 if (dev == NULL || ifp->idev->dev == dev || 1257 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1258 break; 1259 } 1260 } 1261 read_unlock_bh(&addrconf_hash_lock); 1262 return ifp != NULL; 1263 } 1264 EXPORT_SYMBOL(ipv6_chk_addr); 1265 1266 static 1267 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1268 struct net_device *dev) 1269 { 1270 struct inet6_ifaddr * ifp; 1271 u8 hash = ipv6_addr_hash(addr); 1272 1273 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1274 if (!net_eq(dev_net(ifp->idev->dev), net)) 1275 continue; 1276 if (ipv6_addr_equal(&ifp->addr, addr)) { 1277 if (dev == NULL || ifp->idev->dev == dev) 1278 break; 1279 } 1280 } 1281 return ifp != NULL; 1282 } 1283 1284 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1285 { 1286 struct inet6_dev *idev; 1287 struct inet6_ifaddr *ifa; 1288 int onlink; 1289 1290 onlink = 0; 1291 rcu_read_lock(); 1292 idev = __in6_dev_get(dev); 1293 if (idev) { 1294 read_lock_bh(&idev->lock); 1295 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1296 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1297 ifa->prefix_len); 1298 if (onlink) 1299 break; 1300 } 1301 read_unlock_bh(&idev->lock); 1302 } 1303 rcu_read_unlock(); 1304 return onlink; 1305 } 1306 1307 EXPORT_SYMBOL(ipv6_chk_prefix); 1308 1309 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1310 struct net_device *dev, int strict) 1311 { 1312 struct inet6_ifaddr * ifp; 1313 u8 hash = ipv6_addr_hash(addr); 1314 1315 read_lock_bh(&addrconf_hash_lock); 1316 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1317 if (!net_eq(dev_net(ifp->idev->dev), net)) 1318 continue; 1319 if (ipv6_addr_equal(&ifp->addr, addr)) { 1320 if (dev == NULL || ifp->idev->dev == dev || 1321 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1322 in6_ifa_hold(ifp); 1323 break; 1324 } 1325 } 1326 } 1327 read_unlock_bh(&addrconf_hash_lock); 1328 1329 return ifp; 1330 } 1331 1332 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1333 { 1334 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1335 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1336 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1337 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1338 int sk_ipv6only = ipv6_only_sock(sk); 1339 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1340 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1341 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1342 1343 if (!sk2_rcv_saddr && !sk_ipv6only) 1344 return 1; 1345 1346 if (addr_type2 == IPV6_ADDR_ANY && 1347 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1348 return 1; 1349 1350 if (addr_type == IPV6_ADDR_ANY && 1351 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1352 return 1; 1353 1354 if (sk2_rcv_saddr6 && 1355 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1356 return 1; 1357 1358 if (addr_type == IPV6_ADDR_MAPPED && 1359 !sk2_ipv6only && 1360 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1361 return 1; 1362 1363 return 0; 1364 } 1365 1366 /* Gets referenced address, destroys ifaddr */ 1367 1368 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1369 { 1370 if (ifp->flags&IFA_F_PERMANENT) { 1371 spin_lock_bh(&ifp->lock); 1372 addrconf_del_timer(ifp); 1373 ifp->flags |= IFA_F_TENTATIVE; 1374 spin_unlock_bh(&ifp->lock); 1375 in6_ifa_put(ifp); 1376 #ifdef CONFIG_IPV6_PRIVACY 1377 } else if (ifp->flags&IFA_F_TEMPORARY) { 1378 struct inet6_ifaddr *ifpub; 1379 spin_lock_bh(&ifp->lock); 1380 ifpub = ifp->ifpub; 1381 if (ifpub) { 1382 in6_ifa_hold(ifpub); 1383 spin_unlock_bh(&ifp->lock); 1384 ipv6_create_tempaddr(ifpub, ifp); 1385 in6_ifa_put(ifpub); 1386 } else { 1387 spin_unlock_bh(&ifp->lock); 1388 } 1389 ipv6_del_addr(ifp); 1390 #endif 1391 } else 1392 ipv6_del_addr(ifp); 1393 } 1394 1395 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1396 { 1397 if (net_ratelimit()) 1398 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1399 addrconf_dad_stop(ifp); 1400 } 1401 1402 /* Join to solicited addr multicast group. */ 1403 1404 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1405 { 1406 struct in6_addr maddr; 1407 1408 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1409 return; 1410 1411 addrconf_addr_solict_mult(addr, &maddr); 1412 ipv6_dev_mc_inc(dev, &maddr); 1413 } 1414 1415 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1416 { 1417 struct in6_addr maddr; 1418 1419 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1420 return; 1421 1422 addrconf_addr_solict_mult(addr, &maddr); 1423 __ipv6_dev_mc_dec(idev, &maddr); 1424 } 1425 1426 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1427 { 1428 struct in6_addr addr; 1429 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1430 if (ipv6_addr_any(&addr)) 1431 return; 1432 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1433 } 1434 1435 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1436 { 1437 struct in6_addr addr; 1438 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1439 if (ipv6_addr_any(&addr)) 1440 return; 1441 __ipv6_dev_ac_dec(ifp->idev, &addr); 1442 } 1443 1444 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1445 { 1446 if (dev->addr_len != ETH_ALEN) 1447 return -1; 1448 memcpy(eui, dev->dev_addr, 3); 1449 memcpy(eui + 5, dev->dev_addr + 3, 3); 1450 1451 /* 1452 * The zSeries OSA network cards can be shared among various 1453 * OS instances, but the OSA cards have only one MAC address. 1454 * This leads to duplicate address conflicts in conjunction 1455 * with IPv6 if more than one instance uses the same card. 1456 * 1457 * The driver for these cards can deliver a unique 16-bit 1458 * identifier for each instance sharing the same card. It is 1459 * placed instead of 0xFFFE in the interface identifier. The 1460 * "u" bit of the interface identifier is not inverted in this 1461 * case. Hence the resulting interface identifier has local 1462 * scope according to RFC2373. 1463 */ 1464 if (dev->dev_id) { 1465 eui[3] = (dev->dev_id >> 8) & 0xFF; 1466 eui[4] = dev->dev_id & 0xFF; 1467 } else { 1468 eui[3] = 0xFF; 1469 eui[4] = 0xFE; 1470 eui[0] ^= 2; 1471 } 1472 return 0; 1473 } 1474 1475 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1476 { 1477 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1478 if (dev->addr_len != ARCNET_ALEN) 1479 return -1; 1480 memset(eui, 0, 7); 1481 eui[7] = *(u8*)dev->dev_addr; 1482 return 0; 1483 } 1484 1485 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1486 { 1487 if (dev->addr_len != INFINIBAND_ALEN) 1488 return -1; 1489 memcpy(eui, dev->dev_addr + 12, 8); 1490 eui[0] |= 2; 1491 return 0; 1492 } 1493 1494 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1495 { 1496 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1497 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1498 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1499 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1500 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1501 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1502 eui[1] = 0; 1503 eui[2] = 0x5E; 1504 eui[3] = 0xFE; 1505 memcpy(eui + 4, &addr, 4); 1506 return 0; 1507 } 1508 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1509 1510 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1511 { 1512 if (dev->priv_flags & IFF_ISATAP) 1513 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1514 return -1; 1515 } 1516 1517 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1518 { 1519 switch (dev->type) { 1520 case ARPHRD_ETHER: 1521 case ARPHRD_FDDI: 1522 case ARPHRD_IEEE802_TR: 1523 return addrconf_ifid_eui48(eui, dev); 1524 case ARPHRD_ARCNET: 1525 return addrconf_ifid_arcnet(eui, dev); 1526 case ARPHRD_INFINIBAND: 1527 return addrconf_ifid_infiniband(eui, dev); 1528 case ARPHRD_SIT: 1529 return addrconf_ifid_sit(eui, dev); 1530 } 1531 return -1; 1532 } 1533 1534 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1535 { 1536 int err = -1; 1537 struct inet6_ifaddr *ifp; 1538 1539 read_lock_bh(&idev->lock); 1540 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1541 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1542 memcpy(eui, ifp->addr.s6_addr+8, 8); 1543 err = 0; 1544 break; 1545 } 1546 } 1547 read_unlock_bh(&idev->lock); 1548 return err; 1549 } 1550 1551 #ifdef CONFIG_IPV6_PRIVACY 1552 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1553 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1554 { 1555 regen: 1556 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1557 idev->rndid[0] &= ~0x02; 1558 1559 /* 1560 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1561 * check if generated address is not inappropriate 1562 * 1563 * - Reserved subnet anycast (RFC 2526) 1564 * 11111101 11....11 1xxxxxxx 1565 * - ISATAP (RFC4214) 6.1 1566 * 00-00-5E-FE-xx-xx-xx-xx 1567 * - value 0 1568 * - XXX: already assigned to an address on the device 1569 */ 1570 if (idev->rndid[0] == 0xfd && 1571 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1572 (idev->rndid[7]&0x80)) 1573 goto regen; 1574 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1575 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1576 goto regen; 1577 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1578 goto regen; 1579 } 1580 1581 return 0; 1582 } 1583 1584 static void ipv6_regen_rndid(unsigned long data) 1585 { 1586 struct inet6_dev *idev = (struct inet6_dev *) data; 1587 unsigned long expires; 1588 1589 rcu_read_lock_bh(); 1590 write_lock_bh(&idev->lock); 1591 1592 if (idev->dead) 1593 goto out; 1594 1595 if (__ipv6_regen_rndid(idev) < 0) 1596 goto out; 1597 1598 expires = jiffies + 1599 idev->cnf.temp_prefered_lft * HZ - 1600 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1601 if (time_before(expires, jiffies)) { 1602 printk(KERN_WARNING 1603 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1604 idev->dev->name); 1605 goto out; 1606 } 1607 1608 if (!mod_timer(&idev->regen_timer, expires)) 1609 in6_dev_hold(idev); 1610 1611 out: 1612 write_unlock_bh(&idev->lock); 1613 rcu_read_unlock_bh(); 1614 in6_dev_put(idev); 1615 } 1616 1617 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1618 int ret = 0; 1619 1620 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1621 ret = __ipv6_regen_rndid(idev); 1622 return ret; 1623 } 1624 #endif 1625 1626 /* 1627 * Add prefix route. 1628 */ 1629 1630 static void 1631 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1632 unsigned long expires, u32 flags) 1633 { 1634 struct fib6_config cfg = { 1635 .fc_table = RT6_TABLE_PREFIX, 1636 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1637 .fc_ifindex = dev->ifindex, 1638 .fc_expires = expires, 1639 .fc_dst_len = plen, 1640 .fc_flags = RTF_UP | flags, 1641 .fc_nlinfo.nl_net = dev_net(dev), 1642 }; 1643 1644 ipv6_addr_copy(&cfg.fc_dst, pfx); 1645 1646 /* Prevent useless cloning on PtP SIT. 1647 This thing is done here expecting that the whole 1648 class of non-broadcast devices need not cloning. 1649 */ 1650 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1651 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1652 cfg.fc_flags |= RTF_NONEXTHOP; 1653 #endif 1654 1655 ip6_route_add(&cfg); 1656 } 1657 1658 /* Create "default" multicast route to the interface */ 1659 1660 static void addrconf_add_mroute(struct net_device *dev) 1661 { 1662 struct fib6_config cfg = { 1663 .fc_table = RT6_TABLE_LOCAL, 1664 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1665 .fc_ifindex = dev->ifindex, 1666 .fc_dst_len = 8, 1667 .fc_flags = RTF_UP, 1668 .fc_nlinfo.nl_net = dev_net(dev), 1669 }; 1670 1671 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1672 1673 ip6_route_add(&cfg); 1674 } 1675 1676 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1677 static void sit_route_add(struct net_device *dev) 1678 { 1679 struct fib6_config cfg = { 1680 .fc_table = RT6_TABLE_MAIN, 1681 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1682 .fc_ifindex = dev->ifindex, 1683 .fc_dst_len = 96, 1684 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1685 .fc_nlinfo.nl_net = dev_net(dev), 1686 }; 1687 1688 /* prefix length - 96 bits "::d.d.d.d" */ 1689 ip6_route_add(&cfg); 1690 } 1691 #endif 1692 1693 static void addrconf_add_lroute(struct net_device *dev) 1694 { 1695 struct in6_addr addr; 1696 1697 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1698 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1699 } 1700 1701 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1702 { 1703 struct inet6_dev *idev; 1704 1705 ASSERT_RTNL(); 1706 1707 if ((idev = ipv6_find_idev(dev)) == NULL) 1708 return NULL; 1709 1710 /* Add default multicast route */ 1711 addrconf_add_mroute(dev); 1712 1713 /* Add link local route */ 1714 addrconf_add_lroute(dev); 1715 return idev; 1716 } 1717 1718 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1719 { 1720 struct prefix_info *pinfo; 1721 __u32 valid_lft; 1722 __u32 prefered_lft; 1723 int addr_type; 1724 unsigned long rt_expires; 1725 struct inet6_dev *in6_dev; 1726 1727 pinfo = (struct prefix_info *) opt; 1728 1729 if (len < sizeof(struct prefix_info)) { 1730 ADBG(("addrconf: prefix option too short\n")); 1731 return; 1732 } 1733 1734 /* 1735 * Validation checks ([ADDRCONF], page 19) 1736 */ 1737 1738 addr_type = ipv6_addr_type(&pinfo->prefix); 1739 1740 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1741 return; 1742 1743 valid_lft = ntohl(pinfo->valid); 1744 prefered_lft = ntohl(pinfo->prefered); 1745 1746 if (prefered_lft > valid_lft) { 1747 if (net_ratelimit()) 1748 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1749 return; 1750 } 1751 1752 in6_dev = in6_dev_get(dev); 1753 1754 if (in6_dev == NULL) { 1755 if (net_ratelimit()) 1756 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1757 return; 1758 } 1759 1760 /* 1761 * Two things going on here: 1762 * 1) Add routes for on-link prefixes 1763 * 2) Configure prefixes with the auto flag set 1764 */ 1765 1766 /* Avoid arithmetic overflow. Really, we could 1767 save rt_expires in seconds, likely valid_lft, 1768 but it would require division in fib gc, that it 1769 not good. 1770 */ 1771 if (valid_lft >= 0x7FFFFFFF/HZ) 1772 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1773 else 1774 rt_expires = valid_lft * HZ; 1775 1776 /* 1777 * We convert this (in jiffies) to clock_t later. 1778 * Avoid arithmetic overflow there as well. 1779 * Overflow can happen only if HZ < USER_HZ. 1780 */ 1781 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1782 rt_expires = 0x7FFFFFFF / USER_HZ; 1783 1784 if (pinfo->onlink) { 1785 struct rt6_info *rt; 1786 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL, 1787 dev->ifindex, 1); 1788 1789 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1790 if (rt->rt6i_flags&RTF_EXPIRES) { 1791 if (valid_lft == 0) { 1792 ip6_del_rt(rt); 1793 rt = NULL; 1794 } else { 1795 rt->rt6i_expires = jiffies + rt_expires; 1796 } 1797 } 1798 } else if (valid_lft) { 1799 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1800 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1801 } 1802 if (rt) 1803 dst_release(&rt->u.dst); 1804 } 1805 1806 /* Try to figure out our local address for this prefix */ 1807 1808 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1809 struct inet6_ifaddr * ifp; 1810 struct in6_addr addr; 1811 int create = 0, update_lft = 0; 1812 1813 if (pinfo->prefix_len == 64) { 1814 memcpy(&addr, &pinfo->prefix, 8); 1815 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1816 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1817 in6_dev_put(in6_dev); 1818 return; 1819 } 1820 goto ok; 1821 } 1822 if (net_ratelimit()) 1823 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1824 pinfo->prefix_len); 1825 in6_dev_put(in6_dev); 1826 return; 1827 1828 ok: 1829 1830 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1); 1831 1832 if (ifp == NULL && valid_lft) { 1833 int max_addresses = in6_dev->cnf.max_addresses; 1834 u32 addr_flags = 0; 1835 1836 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1837 if (in6_dev->cnf.optimistic_dad && 1838 !ipv6_devconf.forwarding) 1839 addr_flags = IFA_F_OPTIMISTIC; 1840 #endif 1841 1842 /* Do not allow to create too much of autoconfigured 1843 * addresses; this would be too easy way to crash kernel. 1844 */ 1845 if (!max_addresses || 1846 ipv6_count_addresses(in6_dev) < max_addresses) 1847 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1848 addr_type&IPV6_ADDR_SCOPE_MASK, 1849 addr_flags); 1850 1851 if (!ifp || IS_ERR(ifp)) { 1852 in6_dev_put(in6_dev); 1853 return; 1854 } 1855 1856 update_lft = create = 1; 1857 ifp->cstamp = jiffies; 1858 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1859 } 1860 1861 if (ifp) { 1862 int flags; 1863 unsigned long now; 1864 #ifdef CONFIG_IPV6_PRIVACY 1865 struct inet6_ifaddr *ift; 1866 #endif 1867 u32 stored_lft; 1868 1869 /* update lifetime (RFC2462 5.5.3 e) */ 1870 spin_lock(&ifp->lock); 1871 now = jiffies; 1872 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1873 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1874 else 1875 stored_lft = 0; 1876 if (!update_lft && stored_lft) { 1877 if (valid_lft > MIN_VALID_LIFETIME || 1878 valid_lft > stored_lft) 1879 update_lft = 1; 1880 else if (stored_lft <= MIN_VALID_LIFETIME) { 1881 /* valid_lft <= stored_lft is always true */ 1882 /* XXX: IPsec */ 1883 update_lft = 0; 1884 } else { 1885 valid_lft = MIN_VALID_LIFETIME; 1886 if (valid_lft < prefered_lft) 1887 prefered_lft = valid_lft; 1888 update_lft = 1; 1889 } 1890 } 1891 1892 if (update_lft) { 1893 ifp->valid_lft = valid_lft; 1894 ifp->prefered_lft = prefered_lft; 1895 ifp->tstamp = now; 1896 flags = ifp->flags; 1897 ifp->flags &= ~IFA_F_DEPRECATED; 1898 spin_unlock(&ifp->lock); 1899 1900 if (!(flags&IFA_F_TENTATIVE)) 1901 ipv6_ifa_notify(0, ifp); 1902 } else 1903 spin_unlock(&ifp->lock); 1904 1905 #ifdef CONFIG_IPV6_PRIVACY 1906 read_lock_bh(&in6_dev->lock); 1907 /* update all temporary addresses in the list */ 1908 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1909 /* 1910 * When adjusting the lifetimes of an existing 1911 * temporary address, only lower the lifetimes. 1912 * Implementations must not increase the 1913 * lifetimes of an existing temporary address 1914 * when processing a Prefix Information Option. 1915 */ 1916 if (ifp != ift->ifpub) 1917 continue; 1918 1919 spin_lock(&ift->lock); 1920 flags = ift->flags; 1921 if (ift->valid_lft > valid_lft && 1922 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1923 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1924 if (ift->prefered_lft > prefered_lft && 1925 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1926 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1927 spin_unlock(&ift->lock); 1928 if (!(flags&IFA_F_TENTATIVE)) 1929 ipv6_ifa_notify(0, ift); 1930 } 1931 1932 if (create && in6_dev->cnf.use_tempaddr > 0) { 1933 /* 1934 * When a new public address is created as described in [ADDRCONF], 1935 * also create a new temporary address. 1936 */ 1937 read_unlock_bh(&in6_dev->lock); 1938 ipv6_create_tempaddr(ifp, NULL); 1939 } else { 1940 read_unlock_bh(&in6_dev->lock); 1941 } 1942 #endif 1943 in6_ifa_put(ifp); 1944 addrconf_verify(0); 1945 } 1946 } 1947 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1948 in6_dev_put(in6_dev); 1949 } 1950 1951 /* 1952 * Set destination address. 1953 * Special case for SIT interfaces where we create a new "virtual" 1954 * device. 1955 */ 1956 int addrconf_set_dstaddr(struct net *net, void __user *arg) 1957 { 1958 struct in6_ifreq ireq; 1959 struct net_device *dev; 1960 int err = -EINVAL; 1961 1962 rtnl_lock(); 1963 1964 err = -EFAULT; 1965 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1966 goto err_exit; 1967 1968 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 1969 1970 err = -ENODEV; 1971 if (dev == NULL) 1972 goto err_exit; 1973 1974 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1975 if (dev->type == ARPHRD_SIT) { 1976 struct ifreq ifr; 1977 mm_segment_t oldfs; 1978 struct ip_tunnel_parm p; 1979 1980 err = -EADDRNOTAVAIL; 1981 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1982 goto err_exit; 1983 1984 memset(&p, 0, sizeof(p)); 1985 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1986 p.iph.saddr = 0; 1987 p.iph.version = 4; 1988 p.iph.ihl = 5; 1989 p.iph.protocol = IPPROTO_IPV6; 1990 p.iph.ttl = 64; 1991 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 1992 1993 oldfs = get_fs(); set_fs(KERNEL_DS); 1994 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1995 set_fs(oldfs); 1996 1997 if (err == 0) { 1998 err = -ENOBUFS; 1999 dev = __dev_get_by_name(net, p.name); 2000 if (!dev) 2001 goto err_exit; 2002 err = dev_open(dev); 2003 } 2004 } 2005 #endif 2006 2007 err_exit: 2008 rtnl_unlock(); 2009 return err; 2010 } 2011 2012 /* 2013 * Manual configuration of address on an interface 2014 */ 2015 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2016 int plen, __u8 ifa_flags, __u32 prefered_lft, 2017 __u32 valid_lft) 2018 { 2019 struct inet6_ifaddr *ifp; 2020 struct inet6_dev *idev; 2021 struct net_device *dev; 2022 int scope; 2023 u32 flags = RTF_EXPIRES; 2024 2025 ASSERT_RTNL(); 2026 2027 /* check the lifetime */ 2028 if (!valid_lft || prefered_lft > valid_lft) 2029 return -EINVAL; 2030 2031 dev = __dev_get_by_index(net, ifindex); 2032 if (!dev) 2033 return -ENODEV; 2034 2035 if ((idev = addrconf_add_dev(dev)) == NULL) 2036 return -ENOBUFS; 2037 2038 scope = ipv6_addr_scope(pfx); 2039 2040 if (valid_lft == INFINITY_LIFE_TIME) { 2041 ifa_flags |= IFA_F_PERMANENT; 2042 flags = 0; 2043 } else if (valid_lft >= 0x7FFFFFFF/HZ) 2044 valid_lft = 0x7FFFFFFF/HZ; 2045 2046 if (prefered_lft == 0) 2047 ifa_flags |= IFA_F_DEPRECATED; 2048 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 2049 (prefered_lft != INFINITY_LIFE_TIME)) 2050 prefered_lft = 0x7FFFFFFF/HZ; 2051 2052 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2053 2054 if (!IS_ERR(ifp)) { 2055 spin_lock_bh(&ifp->lock); 2056 ifp->valid_lft = valid_lft; 2057 ifp->prefered_lft = prefered_lft; 2058 ifp->tstamp = jiffies; 2059 spin_unlock_bh(&ifp->lock); 2060 2061 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2062 jiffies_to_clock_t(valid_lft * HZ), flags); 2063 /* 2064 * Note that section 3.1 of RFC 4429 indicates 2065 * that the Optimistic flag should not be set for 2066 * manually configured addresses 2067 */ 2068 addrconf_dad_start(ifp, 0); 2069 in6_ifa_put(ifp); 2070 addrconf_verify(0); 2071 return 0; 2072 } 2073 2074 return PTR_ERR(ifp); 2075 } 2076 2077 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2078 int plen) 2079 { 2080 struct inet6_ifaddr *ifp; 2081 struct inet6_dev *idev; 2082 struct net_device *dev; 2083 2084 dev = __dev_get_by_index(net, ifindex); 2085 if (!dev) 2086 return -ENODEV; 2087 2088 if ((idev = __in6_dev_get(dev)) == NULL) 2089 return -ENXIO; 2090 2091 read_lock_bh(&idev->lock); 2092 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2093 if (ifp->prefix_len == plen && 2094 ipv6_addr_equal(pfx, &ifp->addr)) { 2095 in6_ifa_hold(ifp); 2096 read_unlock_bh(&idev->lock); 2097 2098 ipv6_del_addr(ifp); 2099 2100 /* If the last address is deleted administratively, 2101 disable IPv6 on this interface. 2102 */ 2103 if (idev->addr_list == NULL) 2104 addrconf_ifdown(idev->dev, 1); 2105 return 0; 2106 } 2107 } 2108 read_unlock_bh(&idev->lock); 2109 return -EADDRNOTAVAIL; 2110 } 2111 2112 2113 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2114 { 2115 struct in6_ifreq ireq; 2116 int err; 2117 2118 if (!capable(CAP_NET_ADMIN)) 2119 return -EPERM; 2120 2121 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2122 return -EFAULT; 2123 2124 rtnl_lock(); 2125 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2126 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2127 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2128 rtnl_unlock(); 2129 return err; 2130 } 2131 2132 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2133 { 2134 struct in6_ifreq ireq; 2135 int err; 2136 2137 if (!capable(CAP_NET_ADMIN)) 2138 return -EPERM; 2139 2140 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2141 return -EFAULT; 2142 2143 rtnl_lock(); 2144 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2145 ireq.ifr6_prefixlen); 2146 rtnl_unlock(); 2147 return err; 2148 } 2149 2150 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2151 static void sit_add_v4_addrs(struct inet6_dev *idev) 2152 { 2153 struct inet6_ifaddr * ifp; 2154 struct in6_addr addr; 2155 struct net_device *dev; 2156 struct net *net = dev_net(idev->dev); 2157 int scope; 2158 2159 ASSERT_RTNL(); 2160 2161 memset(&addr, 0, sizeof(struct in6_addr)); 2162 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2163 2164 if (idev->dev->flags&IFF_POINTOPOINT) { 2165 addr.s6_addr32[0] = htonl(0xfe800000); 2166 scope = IFA_LINK; 2167 } else { 2168 scope = IPV6_ADDR_COMPATv4; 2169 } 2170 2171 if (addr.s6_addr32[3]) { 2172 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2173 if (!IS_ERR(ifp)) { 2174 spin_lock_bh(&ifp->lock); 2175 ifp->flags &= ~IFA_F_TENTATIVE; 2176 spin_unlock_bh(&ifp->lock); 2177 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2178 in6_ifa_put(ifp); 2179 } 2180 return; 2181 } 2182 2183 for_each_netdev(net, dev) { 2184 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2185 if (in_dev && (dev->flags & IFF_UP)) { 2186 struct in_ifaddr * ifa; 2187 2188 int flag = scope; 2189 2190 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2191 int plen; 2192 2193 addr.s6_addr32[3] = ifa->ifa_local; 2194 2195 if (ifa->ifa_scope == RT_SCOPE_LINK) 2196 continue; 2197 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2198 if (idev->dev->flags&IFF_POINTOPOINT) 2199 continue; 2200 flag |= IFA_HOST; 2201 } 2202 if (idev->dev->flags&IFF_POINTOPOINT) 2203 plen = 64; 2204 else 2205 plen = 96; 2206 2207 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2208 IFA_F_PERMANENT); 2209 if (!IS_ERR(ifp)) { 2210 spin_lock_bh(&ifp->lock); 2211 ifp->flags &= ~IFA_F_TENTATIVE; 2212 spin_unlock_bh(&ifp->lock); 2213 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2214 in6_ifa_put(ifp); 2215 } 2216 } 2217 } 2218 } 2219 } 2220 #endif 2221 2222 static void init_loopback(struct net_device *dev) 2223 { 2224 struct inet6_dev *idev; 2225 struct inet6_ifaddr * ifp; 2226 2227 /* ::1 */ 2228 2229 ASSERT_RTNL(); 2230 2231 if ((idev = ipv6_find_idev(dev)) == NULL) { 2232 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2233 return; 2234 } 2235 2236 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2237 if (!IS_ERR(ifp)) { 2238 spin_lock_bh(&ifp->lock); 2239 ifp->flags &= ~IFA_F_TENTATIVE; 2240 spin_unlock_bh(&ifp->lock); 2241 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2242 in6_ifa_put(ifp); 2243 } 2244 } 2245 2246 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2247 { 2248 struct inet6_ifaddr * ifp; 2249 u32 addr_flags = IFA_F_PERMANENT; 2250 2251 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2252 if (idev->cnf.optimistic_dad && 2253 !ipv6_devconf.forwarding) 2254 addr_flags |= IFA_F_OPTIMISTIC; 2255 #endif 2256 2257 2258 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2259 if (!IS_ERR(ifp)) { 2260 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2261 addrconf_dad_start(ifp, 0); 2262 in6_ifa_put(ifp); 2263 } 2264 } 2265 2266 static void addrconf_dev_config(struct net_device *dev) 2267 { 2268 struct in6_addr addr; 2269 struct inet6_dev * idev; 2270 2271 ASSERT_RTNL(); 2272 2273 if ((dev->type != ARPHRD_ETHER) && 2274 (dev->type != ARPHRD_FDDI) && 2275 (dev->type != ARPHRD_IEEE802_TR) && 2276 (dev->type != ARPHRD_ARCNET) && 2277 (dev->type != ARPHRD_INFINIBAND)) { 2278 /* Alas, we support only Ethernet autoconfiguration. */ 2279 return; 2280 } 2281 2282 idev = addrconf_add_dev(dev); 2283 if (idev == NULL) 2284 return; 2285 2286 memset(&addr, 0, sizeof(struct in6_addr)); 2287 addr.s6_addr32[0] = htonl(0xFE800000); 2288 2289 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2290 addrconf_add_linklocal(idev, &addr); 2291 } 2292 2293 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2294 static void addrconf_sit_config(struct net_device *dev) 2295 { 2296 struct inet6_dev *idev; 2297 2298 ASSERT_RTNL(); 2299 2300 /* 2301 * Configure the tunnel with one of our IPv4 2302 * addresses... we should configure all of 2303 * our v4 addrs in the tunnel 2304 */ 2305 2306 if ((idev = ipv6_find_idev(dev)) == NULL) { 2307 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2308 return; 2309 } 2310 2311 if (dev->priv_flags & IFF_ISATAP) { 2312 struct in6_addr addr; 2313 2314 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2315 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2316 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2317 addrconf_add_linklocal(idev, &addr); 2318 return; 2319 } 2320 2321 sit_add_v4_addrs(idev); 2322 2323 if (dev->flags&IFF_POINTOPOINT) { 2324 addrconf_add_mroute(dev); 2325 addrconf_add_lroute(dev); 2326 } else 2327 sit_route_add(dev); 2328 } 2329 #endif 2330 2331 static inline int 2332 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2333 { 2334 struct in6_addr lladdr; 2335 2336 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2337 addrconf_add_linklocal(idev, &lladdr); 2338 return 0; 2339 } 2340 return -1; 2341 } 2342 2343 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2344 { 2345 struct net_device *link_dev; 2346 struct net *net = dev_net(idev->dev); 2347 2348 /* first try to inherit the link-local address from the link device */ 2349 if (idev->dev->iflink && 2350 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2351 if (!ipv6_inherit_linklocal(idev, link_dev)) 2352 return; 2353 } 2354 /* then try to inherit it from any device */ 2355 for_each_netdev(net, link_dev) { 2356 if (!ipv6_inherit_linklocal(idev, link_dev)) 2357 return; 2358 } 2359 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2360 } 2361 2362 /* 2363 * Autoconfigure tunnel with a link-local address so routing protocols, 2364 * DHCPv6, MLD etc. can be run over the virtual link 2365 */ 2366 2367 static void addrconf_ip6_tnl_config(struct net_device *dev) 2368 { 2369 struct inet6_dev *idev; 2370 2371 ASSERT_RTNL(); 2372 2373 if ((idev = addrconf_add_dev(dev)) == NULL) { 2374 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2375 return; 2376 } 2377 ip6_tnl_add_linklocal(idev); 2378 } 2379 2380 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2381 void * data) 2382 { 2383 struct net_device *dev = (struct net_device *) data; 2384 struct inet6_dev *idev = __in6_dev_get(dev); 2385 int run_pending = 0; 2386 int err; 2387 2388 switch(event) { 2389 case NETDEV_REGISTER: 2390 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2391 idev = ipv6_add_dev(dev); 2392 if (!idev) 2393 return notifier_from_errno(-ENOMEM); 2394 } 2395 break; 2396 case NETDEV_UP: 2397 case NETDEV_CHANGE: 2398 if (dev->flags & IFF_SLAVE) 2399 break; 2400 2401 if (event == NETDEV_UP) { 2402 if (!addrconf_qdisc_ok(dev)) { 2403 /* device is not ready yet. */ 2404 printk(KERN_INFO 2405 "ADDRCONF(NETDEV_UP): %s: " 2406 "link is not ready\n", 2407 dev->name); 2408 break; 2409 } 2410 2411 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2412 idev = ipv6_add_dev(dev); 2413 2414 if (idev) 2415 idev->if_flags |= IF_READY; 2416 } else { 2417 if (!addrconf_qdisc_ok(dev)) { 2418 /* device is still not ready. */ 2419 break; 2420 } 2421 2422 if (idev) { 2423 if (idev->if_flags & IF_READY) { 2424 /* device is already configured. */ 2425 break; 2426 } 2427 idev->if_flags |= IF_READY; 2428 } 2429 2430 printk(KERN_INFO 2431 "ADDRCONF(NETDEV_CHANGE): %s: " 2432 "link becomes ready\n", 2433 dev->name); 2434 2435 run_pending = 1; 2436 } 2437 2438 switch(dev->type) { 2439 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2440 case ARPHRD_SIT: 2441 addrconf_sit_config(dev); 2442 break; 2443 #endif 2444 case ARPHRD_TUNNEL6: 2445 addrconf_ip6_tnl_config(dev); 2446 break; 2447 case ARPHRD_LOOPBACK: 2448 init_loopback(dev); 2449 break; 2450 2451 default: 2452 addrconf_dev_config(dev); 2453 break; 2454 } 2455 if (idev) { 2456 if (run_pending) 2457 addrconf_dad_run(idev); 2458 2459 /* If the MTU changed during the interface down, when the 2460 interface up, the changed MTU must be reflected in the 2461 idev as well as routers. 2462 */ 2463 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2464 rt6_mtu_change(dev, dev->mtu); 2465 idev->cnf.mtu6 = dev->mtu; 2466 } 2467 idev->tstamp = jiffies; 2468 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2469 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2470 stop IPv6 on this interface. 2471 */ 2472 if (dev->mtu < IPV6_MIN_MTU) 2473 addrconf_ifdown(dev, event != NETDEV_DOWN); 2474 } 2475 break; 2476 2477 case NETDEV_CHANGEMTU: 2478 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2479 rt6_mtu_change(dev, dev->mtu); 2480 idev->cnf.mtu6 = dev->mtu; 2481 break; 2482 } 2483 2484 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2485 idev = ipv6_add_dev(dev); 2486 if (idev) 2487 break; 2488 } 2489 2490 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2491 2492 case NETDEV_DOWN: 2493 case NETDEV_UNREGISTER: 2494 /* 2495 * Remove all addresses from this interface. 2496 */ 2497 addrconf_ifdown(dev, event != NETDEV_DOWN); 2498 break; 2499 2500 case NETDEV_CHANGENAME: 2501 if (idev) { 2502 snmp6_unregister_dev(idev); 2503 addrconf_sysctl_unregister(idev); 2504 addrconf_sysctl_register(idev); 2505 err = snmp6_register_dev(idev); 2506 if (err) 2507 return notifier_from_errno(err); 2508 } 2509 break; 2510 } 2511 2512 return NOTIFY_OK; 2513 } 2514 2515 /* 2516 * addrconf module should be notified of a device going up 2517 */ 2518 static struct notifier_block ipv6_dev_notf = { 2519 .notifier_call = addrconf_notify, 2520 .priority = 0 2521 }; 2522 2523 static int addrconf_ifdown(struct net_device *dev, int how) 2524 { 2525 struct inet6_dev *idev; 2526 struct inet6_ifaddr *ifa, **bifa; 2527 struct net *net = dev_net(dev); 2528 int i; 2529 2530 ASSERT_RTNL(); 2531 2532 if (dev == init_net.loopback_dev && how == 1) 2533 how = 0; 2534 2535 rt6_ifdown(net, dev); 2536 neigh_ifdown(&nd_tbl, dev); 2537 2538 idev = __in6_dev_get(dev); 2539 if (idev == NULL) 2540 return -ENODEV; 2541 2542 /* Step 1: remove reference to ipv6 device from parent device. 2543 Do not dev_put! 2544 */ 2545 if (how == 1) { 2546 idev->dead = 1; 2547 2548 /* protected by rtnl_lock */ 2549 rcu_assign_pointer(dev->ip6_ptr, NULL); 2550 2551 /* Step 1.5: remove snmp6 entry */ 2552 snmp6_unregister_dev(idev); 2553 2554 } 2555 2556 /* Step 2: clear hash table */ 2557 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2558 bifa = &inet6_addr_lst[i]; 2559 2560 write_lock_bh(&addrconf_hash_lock); 2561 while ((ifa = *bifa) != NULL) { 2562 if (ifa->idev == idev) { 2563 *bifa = ifa->lst_next; 2564 ifa->lst_next = NULL; 2565 addrconf_del_timer(ifa); 2566 in6_ifa_put(ifa); 2567 continue; 2568 } 2569 bifa = &ifa->lst_next; 2570 } 2571 write_unlock_bh(&addrconf_hash_lock); 2572 } 2573 2574 write_lock_bh(&idev->lock); 2575 2576 /* Step 3: clear flags for stateless addrconf */ 2577 if (how != 1) 2578 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2579 2580 /* Step 4: clear address list */ 2581 #ifdef CONFIG_IPV6_PRIVACY 2582 if (how == 1 && del_timer(&idev->regen_timer)) 2583 in6_dev_put(idev); 2584 2585 /* clear tempaddr list */ 2586 while ((ifa = idev->tempaddr_list) != NULL) { 2587 idev->tempaddr_list = ifa->tmp_next; 2588 ifa->tmp_next = NULL; 2589 ifa->dead = 1; 2590 write_unlock_bh(&idev->lock); 2591 spin_lock_bh(&ifa->lock); 2592 2593 if (ifa->ifpub) { 2594 in6_ifa_put(ifa->ifpub); 2595 ifa->ifpub = NULL; 2596 } 2597 spin_unlock_bh(&ifa->lock); 2598 in6_ifa_put(ifa); 2599 write_lock_bh(&idev->lock); 2600 } 2601 #endif 2602 while ((ifa = idev->addr_list) != NULL) { 2603 idev->addr_list = ifa->if_next; 2604 ifa->if_next = NULL; 2605 ifa->dead = 1; 2606 addrconf_del_timer(ifa); 2607 write_unlock_bh(&idev->lock); 2608 2609 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2610 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2611 in6_ifa_put(ifa); 2612 2613 write_lock_bh(&idev->lock); 2614 } 2615 write_unlock_bh(&idev->lock); 2616 2617 /* Step 5: Discard multicast list */ 2618 2619 if (how == 1) 2620 ipv6_mc_destroy_dev(idev); 2621 else 2622 ipv6_mc_down(idev); 2623 2624 idev->tstamp = jiffies; 2625 2626 /* Shot the device (if unregistered) */ 2627 2628 if (how == 1) { 2629 addrconf_sysctl_unregister(idev); 2630 neigh_parms_release(&nd_tbl, idev->nd_parms); 2631 neigh_ifdown(&nd_tbl, dev); 2632 in6_dev_put(idev); 2633 } 2634 return 0; 2635 } 2636 2637 static void addrconf_rs_timer(unsigned long data) 2638 { 2639 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2640 2641 if (ifp->idev->cnf.forwarding) 2642 goto out; 2643 2644 if (ifp->idev->if_flags & IF_RA_RCVD) { 2645 /* 2646 * Announcement received after solicitation 2647 * was sent 2648 */ 2649 goto out; 2650 } 2651 2652 spin_lock(&ifp->lock); 2653 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2654 /* The wait after the last probe can be shorter */ 2655 addrconf_mod_timer(ifp, AC_RS, 2656 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2657 ifp->idev->cnf.rtr_solicit_delay : 2658 ifp->idev->cnf.rtr_solicit_interval); 2659 spin_unlock(&ifp->lock); 2660 2661 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2662 } else { 2663 spin_unlock(&ifp->lock); 2664 /* 2665 * Note: we do not support deprecated "all on-link" 2666 * assumption any longer. 2667 */ 2668 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2669 ifp->idev->dev->name); 2670 } 2671 2672 out: 2673 in6_ifa_put(ifp); 2674 } 2675 2676 /* 2677 * Duplicate Address Detection 2678 */ 2679 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2680 { 2681 unsigned long rand_num; 2682 struct inet6_dev *idev = ifp->idev; 2683 2684 if (ifp->flags & IFA_F_OPTIMISTIC) 2685 rand_num = 0; 2686 else 2687 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2688 2689 ifp->probes = idev->cnf.dad_transmits; 2690 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2691 } 2692 2693 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2694 { 2695 struct inet6_dev *idev = ifp->idev; 2696 struct net_device *dev = idev->dev; 2697 2698 addrconf_join_solict(dev, &ifp->addr); 2699 2700 net_srandom(ifp->addr.s6_addr32[3]); 2701 2702 read_lock_bh(&idev->lock); 2703 if (ifp->dead) 2704 goto out; 2705 spin_lock_bh(&ifp->lock); 2706 2707 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2708 !(ifp->flags&IFA_F_TENTATIVE) || 2709 ifp->flags & IFA_F_NODAD) { 2710 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2711 spin_unlock_bh(&ifp->lock); 2712 read_unlock_bh(&idev->lock); 2713 2714 addrconf_dad_completed(ifp); 2715 return; 2716 } 2717 2718 if (!(idev->if_flags & IF_READY)) { 2719 spin_unlock_bh(&ifp->lock); 2720 read_unlock_bh(&idev->lock); 2721 /* 2722 * If the defice is not ready: 2723 * - keep it tentative if it is a permanent address. 2724 * - otherwise, kill it. 2725 */ 2726 in6_ifa_hold(ifp); 2727 addrconf_dad_stop(ifp); 2728 return; 2729 } 2730 2731 /* 2732 * Optimistic nodes can start receiving 2733 * Frames right away 2734 */ 2735 if(ifp->flags & IFA_F_OPTIMISTIC) 2736 ip6_ins_rt(ifp->rt); 2737 2738 addrconf_dad_kick(ifp); 2739 spin_unlock_bh(&ifp->lock); 2740 out: 2741 read_unlock_bh(&idev->lock); 2742 } 2743 2744 static void addrconf_dad_timer(unsigned long data) 2745 { 2746 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2747 struct inet6_dev *idev = ifp->idev; 2748 struct in6_addr unspec; 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 memset(&unspec, 0, sizeof(unspec)); 2778 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2779 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2780 out: 2781 in6_ifa_put(ifp); 2782 } 2783 2784 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2785 { 2786 struct net_device * dev = ifp->idev->dev; 2787 2788 /* 2789 * Configure the address for reception. Now it is valid. 2790 */ 2791 2792 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2793 2794 /* If added prefix is link local and forwarding is off, 2795 start sending router solicitations. 2796 */ 2797 2798 if (ifp->idev->cnf.forwarding == 0 && 2799 ifp->idev->cnf.rtr_solicits > 0 && 2800 (dev->flags&IFF_LOOPBACK) == 0 && 2801 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2802 /* 2803 * If a host as already performed a random delay 2804 * [...] as part of DAD [...] there is no need 2805 * to delay again before sending the first RS 2806 */ 2807 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2808 2809 spin_lock_bh(&ifp->lock); 2810 ifp->probes = 1; 2811 ifp->idev->if_flags |= IF_RS_SENT; 2812 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2813 spin_unlock_bh(&ifp->lock); 2814 } 2815 } 2816 2817 static void addrconf_dad_run(struct inet6_dev *idev) { 2818 struct inet6_ifaddr *ifp; 2819 2820 read_lock_bh(&idev->lock); 2821 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2822 spin_lock_bh(&ifp->lock); 2823 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2824 spin_unlock_bh(&ifp->lock); 2825 continue; 2826 } 2827 spin_unlock_bh(&ifp->lock); 2828 addrconf_dad_kick(ifp); 2829 } 2830 read_unlock_bh(&idev->lock); 2831 } 2832 2833 #ifdef CONFIG_PROC_FS 2834 struct if6_iter_state { 2835 struct seq_net_private p; 2836 int bucket; 2837 }; 2838 2839 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2840 { 2841 struct inet6_ifaddr *ifa = NULL; 2842 struct if6_iter_state *state = seq->private; 2843 struct net *net = seq_file_net(seq); 2844 2845 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2846 ifa = inet6_addr_lst[state->bucket]; 2847 2848 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2849 ifa = ifa->lst_next; 2850 if (ifa) 2851 break; 2852 } 2853 return ifa; 2854 } 2855 2856 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2857 { 2858 struct if6_iter_state *state = seq->private; 2859 struct net *net = seq_file_net(seq); 2860 2861 ifa = ifa->lst_next; 2862 try_again: 2863 if (ifa) { 2864 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2865 ifa = ifa->lst_next; 2866 goto try_again; 2867 } 2868 } 2869 2870 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2871 ifa = inet6_addr_lst[state->bucket]; 2872 goto try_again; 2873 } 2874 2875 return ifa; 2876 } 2877 2878 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2879 { 2880 struct inet6_ifaddr *ifa = if6_get_first(seq); 2881 2882 if (ifa) 2883 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2884 --pos; 2885 return pos ? NULL : ifa; 2886 } 2887 2888 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2889 __acquires(addrconf_hash_lock) 2890 { 2891 read_lock_bh(&addrconf_hash_lock); 2892 return if6_get_idx(seq, *pos); 2893 } 2894 2895 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2896 { 2897 struct inet6_ifaddr *ifa; 2898 2899 ifa = if6_get_next(seq, v); 2900 ++*pos; 2901 return ifa; 2902 } 2903 2904 static void if6_seq_stop(struct seq_file *seq, void *v) 2905 __releases(addrconf_hash_lock) 2906 { 2907 read_unlock_bh(&addrconf_hash_lock); 2908 } 2909 2910 static int if6_seq_show(struct seq_file *seq, void *v) 2911 { 2912 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2913 seq_printf(seq, 2914 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2915 NIP6(ifp->addr), 2916 ifp->idev->dev->ifindex, 2917 ifp->prefix_len, 2918 ifp->scope, 2919 ifp->flags, 2920 ifp->idev->dev->name); 2921 return 0; 2922 } 2923 2924 static const struct seq_operations if6_seq_ops = { 2925 .start = if6_seq_start, 2926 .next = if6_seq_next, 2927 .show = if6_seq_show, 2928 .stop = if6_seq_stop, 2929 }; 2930 2931 static int if6_seq_open(struct inode *inode, struct file *file) 2932 { 2933 return seq_open_net(inode, file, &if6_seq_ops, 2934 sizeof(struct if6_iter_state)); 2935 } 2936 2937 static const struct file_operations if6_fops = { 2938 .owner = THIS_MODULE, 2939 .open = if6_seq_open, 2940 .read = seq_read, 2941 .llseek = seq_lseek, 2942 .release = seq_release_net, 2943 }; 2944 2945 static int if6_proc_net_init(struct net *net) 2946 { 2947 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 2948 return -ENOMEM; 2949 return 0; 2950 } 2951 2952 static void if6_proc_net_exit(struct net *net) 2953 { 2954 proc_net_remove(net, "if_inet6"); 2955 } 2956 2957 static struct pernet_operations if6_proc_net_ops = { 2958 .init = if6_proc_net_init, 2959 .exit = if6_proc_net_exit, 2960 }; 2961 2962 int __init if6_proc_init(void) 2963 { 2964 return register_pernet_subsys(&if6_proc_net_ops); 2965 } 2966 2967 void if6_proc_exit(void) 2968 { 2969 unregister_pernet_subsys(&if6_proc_net_ops); 2970 } 2971 #endif /* CONFIG_PROC_FS */ 2972 2973 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 2974 /* Check if address is a home address configured on any interface. */ 2975 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 2976 { 2977 int ret = 0; 2978 struct inet6_ifaddr * ifp; 2979 u8 hash = ipv6_addr_hash(addr); 2980 read_lock_bh(&addrconf_hash_lock); 2981 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2982 if (!net_eq(dev_net(ifp->idev->dev), net)) 2983 continue; 2984 if (ipv6_addr_equal(&ifp->addr, addr) && 2985 (ifp->flags & IFA_F_HOMEADDRESS)) { 2986 ret = 1; 2987 break; 2988 } 2989 } 2990 read_unlock_bh(&addrconf_hash_lock); 2991 return ret; 2992 } 2993 #endif 2994 2995 /* 2996 * Periodic address status verification 2997 */ 2998 2999 static void addrconf_verify(unsigned long foo) 3000 { 3001 struct inet6_ifaddr *ifp; 3002 unsigned long now, next; 3003 int i; 3004 3005 spin_lock_bh(&addrconf_verify_lock); 3006 now = jiffies; 3007 next = now + ADDR_CHECK_FREQUENCY; 3008 3009 del_timer(&addr_chk_timer); 3010 3011 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3012 3013 restart: 3014 read_lock(&addrconf_hash_lock); 3015 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3016 unsigned long age; 3017 #ifdef CONFIG_IPV6_PRIVACY 3018 unsigned long regen_advance; 3019 #endif 3020 3021 if (ifp->flags & IFA_F_PERMANENT) 3022 continue; 3023 3024 spin_lock(&ifp->lock); 3025 age = (now - ifp->tstamp) / HZ; 3026 3027 #ifdef CONFIG_IPV6_PRIVACY 3028 regen_advance = ifp->idev->cnf.regen_max_retry * 3029 ifp->idev->cnf.dad_transmits * 3030 ifp->idev->nd_parms->retrans_time / HZ; 3031 #endif 3032 3033 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3034 age >= ifp->valid_lft) { 3035 spin_unlock(&ifp->lock); 3036 in6_ifa_hold(ifp); 3037 read_unlock(&addrconf_hash_lock); 3038 ipv6_del_addr(ifp); 3039 goto restart; 3040 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3041 spin_unlock(&ifp->lock); 3042 continue; 3043 } else if (age >= ifp->prefered_lft) { 3044 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 3045 int deprecate = 0; 3046 3047 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3048 deprecate = 1; 3049 ifp->flags |= IFA_F_DEPRECATED; 3050 } 3051 3052 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3053 next = ifp->tstamp + ifp->valid_lft * HZ; 3054 3055 spin_unlock(&ifp->lock); 3056 3057 if (deprecate) { 3058 in6_ifa_hold(ifp); 3059 read_unlock(&addrconf_hash_lock); 3060 3061 ipv6_ifa_notify(0, ifp); 3062 in6_ifa_put(ifp); 3063 goto restart; 3064 } 3065 #ifdef CONFIG_IPV6_PRIVACY 3066 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3067 !(ifp->flags&IFA_F_TENTATIVE)) { 3068 if (age >= ifp->prefered_lft - regen_advance) { 3069 struct inet6_ifaddr *ifpub = ifp->ifpub; 3070 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3071 next = ifp->tstamp + ifp->prefered_lft * HZ; 3072 if (!ifp->regen_count && ifpub) { 3073 ifp->regen_count++; 3074 in6_ifa_hold(ifp); 3075 in6_ifa_hold(ifpub); 3076 spin_unlock(&ifp->lock); 3077 read_unlock(&addrconf_hash_lock); 3078 spin_lock(&ifpub->lock); 3079 ifpub->regen_count = 0; 3080 spin_unlock(&ifpub->lock); 3081 ipv6_create_tempaddr(ifpub, ifp); 3082 in6_ifa_put(ifpub); 3083 in6_ifa_put(ifp); 3084 goto restart; 3085 } 3086 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3087 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3088 spin_unlock(&ifp->lock); 3089 #endif 3090 } else { 3091 /* ifp->prefered_lft <= ifp->valid_lft */ 3092 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3093 next = ifp->tstamp + ifp->prefered_lft * HZ; 3094 spin_unlock(&ifp->lock); 3095 } 3096 } 3097 read_unlock(&addrconf_hash_lock); 3098 } 3099 3100 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3101 add_timer(&addr_chk_timer); 3102 spin_unlock_bh(&addrconf_verify_lock); 3103 } 3104 3105 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3106 { 3107 struct in6_addr *pfx = NULL; 3108 3109 if (addr) 3110 pfx = nla_data(addr); 3111 3112 if (local) { 3113 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3114 pfx = NULL; 3115 else 3116 pfx = nla_data(local); 3117 } 3118 3119 return pfx; 3120 } 3121 3122 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3123 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3124 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3125 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3126 }; 3127 3128 static int 3129 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3130 { 3131 struct net *net = sock_net(skb->sk); 3132 struct ifaddrmsg *ifm; 3133 struct nlattr *tb[IFA_MAX+1]; 3134 struct in6_addr *pfx; 3135 int err; 3136 3137 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3138 if (err < 0) 3139 return err; 3140 3141 ifm = nlmsg_data(nlh); 3142 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3143 if (pfx == NULL) 3144 return -EINVAL; 3145 3146 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3147 } 3148 3149 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3150 u32 prefered_lft, u32 valid_lft) 3151 { 3152 u32 flags = RTF_EXPIRES; 3153 3154 if (!valid_lft || (prefered_lft > valid_lft)) 3155 return -EINVAL; 3156 3157 if (valid_lft == INFINITY_LIFE_TIME) { 3158 ifa_flags |= IFA_F_PERMANENT; 3159 flags = 0; 3160 } else if (valid_lft >= 0x7FFFFFFF/HZ) 3161 valid_lft = 0x7FFFFFFF/HZ; 3162 3163 if (prefered_lft == 0) 3164 ifa_flags |= IFA_F_DEPRECATED; 3165 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 3166 (prefered_lft != INFINITY_LIFE_TIME)) 3167 prefered_lft = 0x7FFFFFFF/HZ; 3168 3169 spin_lock_bh(&ifp->lock); 3170 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3171 ifp->tstamp = jiffies; 3172 ifp->valid_lft = valid_lft; 3173 ifp->prefered_lft = prefered_lft; 3174 3175 spin_unlock_bh(&ifp->lock); 3176 if (!(ifp->flags&IFA_F_TENTATIVE)) 3177 ipv6_ifa_notify(0, ifp); 3178 3179 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3180 jiffies_to_clock_t(valid_lft * HZ), flags); 3181 addrconf_verify(0); 3182 3183 return 0; 3184 } 3185 3186 static int 3187 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3188 { 3189 struct net *net = sock_net(skb->sk); 3190 struct ifaddrmsg *ifm; 3191 struct nlattr *tb[IFA_MAX+1]; 3192 struct in6_addr *pfx; 3193 struct inet6_ifaddr *ifa; 3194 struct net_device *dev; 3195 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3196 u8 ifa_flags; 3197 int err; 3198 3199 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3200 if (err < 0) 3201 return err; 3202 3203 ifm = nlmsg_data(nlh); 3204 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3205 if (pfx == NULL) 3206 return -EINVAL; 3207 3208 if (tb[IFA_CACHEINFO]) { 3209 struct ifa_cacheinfo *ci; 3210 3211 ci = nla_data(tb[IFA_CACHEINFO]); 3212 valid_lft = ci->ifa_valid; 3213 preferred_lft = ci->ifa_prefered; 3214 } else { 3215 preferred_lft = INFINITY_LIFE_TIME; 3216 valid_lft = INFINITY_LIFE_TIME; 3217 } 3218 3219 dev = __dev_get_by_index(net, ifm->ifa_index); 3220 if (dev == NULL) 3221 return -ENODEV; 3222 3223 /* We ignore other flags so far. */ 3224 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3225 3226 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3227 if (ifa == NULL) { 3228 /* 3229 * It would be best to check for !NLM_F_CREATE here but 3230 * userspace alreay relies on not having to provide this. 3231 */ 3232 return inet6_addr_add(net, ifm->ifa_index, pfx, 3233 ifm->ifa_prefixlen, ifa_flags, 3234 preferred_lft, valid_lft); 3235 } 3236 3237 if (nlh->nlmsg_flags & NLM_F_EXCL || 3238 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3239 err = -EEXIST; 3240 else 3241 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3242 3243 in6_ifa_put(ifa); 3244 3245 return err; 3246 } 3247 3248 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3249 u8 scope, int ifindex) 3250 { 3251 struct ifaddrmsg *ifm; 3252 3253 ifm = nlmsg_data(nlh); 3254 ifm->ifa_family = AF_INET6; 3255 ifm->ifa_prefixlen = prefixlen; 3256 ifm->ifa_flags = flags; 3257 ifm->ifa_scope = scope; 3258 ifm->ifa_index = ifindex; 3259 } 3260 3261 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3262 unsigned long tstamp, u32 preferred, u32 valid) 3263 { 3264 struct ifa_cacheinfo ci; 3265 3266 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3267 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3268 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3269 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3270 ci.ifa_prefered = preferred; 3271 ci.ifa_valid = valid; 3272 3273 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3274 } 3275 3276 static inline int rt_scope(int ifa_scope) 3277 { 3278 if (ifa_scope & IFA_HOST) 3279 return RT_SCOPE_HOST; 3280 else if (ifa_scope & IFA_LINK) 3281 return RT_SCOPE_LINK; 3282 else if (ifa_scope & IFA_SITE) 3283 return RT_SCOPE_SITE; 3284 else 3285 return RT_SCOPE_UNIVERSE; 3286 } 3287 3288 static inline int inet6_ifaddr_msgsize(void) 3289 { 3290 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3291 + nla_total_size(16) /* IFA_ADDRESS */ 3292 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3293 } 3294 3295 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3296 u32 pid, u32 seq, int event, unsigned int flags) 3297 { 3298 struct nlmsghdr *nlh; 3299 u32 preferred, valid; 3300 3301 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3302 if (nlh == NULL) 3303 return -EMSGSIZE; 3304 3305 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3306 ifa->idev->dev->ifindex); 3307 3308 if (!(ifa->flags&IFA_F_PERMANENT)) { 3309 preferred = ifa->prefered_lft; 3310 valid = ifa->valid_lft; 3311 if (preferred != INFINITY_LIFE_TIME) { 3312 long tval = (jiffies - ifa->tstamp)/HZ; 3313 preferred -= tval; 3314 if (valid != INFINITY_LIFE_TIME) 3315 valid -= tval; 3316 } 3317 } else { 3318 preferred = INFINITY_LIFE_TIME; 3319 valid = INFINITY_LIFE_TIME; 3320 } 3321 3322 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3323 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3324 nlmsg_cancel(skb, nlh); 3325 return -EMSGSIZE; 3326 } 3327 3328 return nlmsg_end(skb, nlh); 3329 } 3330 3331 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3332 u32 pid, u32 seq, int event, u16 flags) 3333 { 3334 struct nlmsghdr *nlh; 3335 u8 scope = RT_SCOPE_UNIVERSE; 3336 int ifindex = ifmca->idev->dev->ifindex; 3337 3338 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3339 scope = RT_SCOPE_SITE; 3340 3341 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3342 if (nlh == NULL) 3343 return -EMSGSIZE; 3344 3345 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3346 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3347 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3348 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3349 nlmsg_cancel(skb, nlh); 3350 return -EMSGSIZE; 3351 } 3352 3353 return nlmsg_end(skb, nlh); 3354 } 3355 3356 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3357 u32 pid, u32 seq, int event, unsigned int flags) 3358 { 3359 struct nlmsghdr *nlh; 3360 u8 scope = RT_SCOPE_UNIVERSE; 3361 int ifindex = ifaca->aca_idev->dev->ifindex; 3362 3363 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3364 scope = RT_SCOPE_SITE; 3365 3366 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3367 if (nlh == NULL) 3368 return -EMSGSIZE; 3369 3370 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3371 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3372 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3373 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3374 nlmsg_cancel(skb, nlh); 3375 return -EMSGSIZE; 3376 } 3377 3378 return nlmsg_end(skb, nlh); 3379 } 3380 3381 enum addr_type_t 3382 { 3383 UNICAST_ADDR, 3384 MULTICAST_ADDR, 3385 ANYCAST_ADDR, 3386 }; 3387 3388 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3389 enum addr_type_t type) 3390 { 3391 int idx, ip_idx; 3392 int s_idx, s_ip_idx; 3393 int err = 1; 3394 struct net_device *dev; 3395 struct inet6_dev *idev = NULL; 3396 struct inet6_ifaddr *ifa; 3397 struct ifmcaddr6 *ifmca; 3398 struct ifacaddr6 *ifaca; 3399 struct net *net = sock_net(skb->sk); 3400 3401 s_idx = cb->args[0]; 3402 s_ip_idx = ip_idx = cb->args[1]; 3403 3404 idx = 0; 3405 for_each_netdev(net, dev) { 3406 if (idx < s_idx) 3407 goto cont; 3408 if (idx > s_idx) 3409 s_ip_idx = 0; 3410 ip_idx = 0; 3411 if ((idev = in6_dev_get(dev)) == NULL) 3412 goto cont; 3413 read_lock_bh(&idev->lock); 3414 switch (type) { 3415 case UNICAST_ADDR: 3416 /* unicast address incl. temp addr */ 3417 for (ifa = idev->addr_list; ifa; 3418 ifa = ifa->if_next, ip_idx++) { 3419 if (ip_idx < s_ip_idx) 3420 continue; 3421 err = inet6_fill_ifaddr(skb, ifa, 3422 NETLINK_CB(cb->skb).pid, 3423 cb->nlh->nlmsg_seq, 3424 RTM_NEWADDR, 3425 NLM_F_MULTI); 3426 } 3427 break; 3428 case MULTICAST_ADDR: 3429 /* multicast address */ 3430 for (ifmca = idev->mc_list; ifmca; 3431 ifmca = ifmca->next, ip_idx++) { 3432 if (ip_idx < s_ip_idx) 3433 continue; 3434 err = inet6_fill_ifmcaddr(skb, ifmca, 3435 NETLINK_CB(cb->skb).pid, 3436 cb->nlh->nlmsg_seq, 3437 RTM_GETMULTICAST, 3438 NLM_F_MULTI); 3439 } 3440 break; 3441 case ANYCAST_ADDR: 3442 /* anycast address */ 3443 for (ifaca = idev->ac_list; ifaca; 3444 ifaca = ifaca->aca_next, ip_idx++) { 3445 if (ip_idx < s_ip_idx) 3446 continue; 3447 err = inet6_fill_ifacaddr(skb, ifaca, 3448 NETLINK_CB(cb->skb).pid, 3449 cb->nlh->nlmsg_seq, 3450 RTM_GETANYCAST, 3451 NLM_F_MULTI); 3452 } 3453 break; 3454 default: 3455 break; 3456 } 3457 read_unlock_bh(&idev->lock); 3458 in6_dev_put(idev); 3459 3460 if (err <= 0) 3461 break; 3462 cont: 3463 idx++; 3464 } 3465 cb->args[0] = idx; 3466 cb->args[1] = ip_idx; 3467 return skb->len; 3468 } 3469 3470 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3471 { 3472 enum addr_type_t type = UNICAST_ADDR; 3473 3474 return inet6_dump_addr(skb, cb, type); 3475 } 3476 3477 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3478 { 3479 enum addr_type_t type = MULTICAST_ADDR; 3480 3481 return inet6_dump_addr(skb, cb, type); 3482 } 3483 3484 3485 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3486 { 3487 enum addr_type_t type = ANYCAST_ADDR; 3488 3489 return inet6_dump_addr(skb, cb, type); 3490 } 3491 3492 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3493 void *arg) 3494 { 3495 struct net *net = sock_net(in_skb->sk); 3496 struct ifaddrmsg *ifm; 3497 struct nlattr *tb[IFA_MAX+1]; 3498 struct in6_addr *addr = NULL; 3499 struct net_device *dev = NULL; 3500 struct inet6_ifaddr *ifa; 3501 struct sk_buff *skb; 3502 int err; 3503 3504 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3505 if (err < 0) 3506 goto errout; 3507 3508 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3509 if (addr == NULL) { 3510 err = -EINVAL; 3511 goto errout; 3512 } 3513 3514 ifm = nlmsg_data(nlh); 3515 if (ifm->ifa_index) 3516 dev = __dev_get_by_index(net, ifm->ifa_index); 3517 3518 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3519 err = -EADDRNOTAVAIL; 3520 goto errout; 3521 } 3522 3523 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3524 err = -ENOBUFS; 3525 goto errout_ifa; 3526 } 3527 3528 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3529 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3530 if (err < 0) { 3531 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3532 WARN_ON(err == -EMSGSIZE); 3533 kfree_skb(skb); 3534 goto errout_ifa; 3535 } 3536 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3537 errout_ifa: 3538 in6_ifa_put(ifa); 3539 errout: 3540 return err; 3541 } 3542 3543 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3544 { 3545 struct sk_buff *skb; 3546 struct net *net = dev_net(ifa->idev->dev); 3547 int err = -ENOBUFS; 3548 3549 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3550 if (skb == NULL) 3551 goto errout; 3552 3553 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3554 if (err < 0) { 3555 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3556 WARN_ON(err == -EMSGSIZE); 3557 kfree_skb(skb); 3558 goto errout; 3559 } 3560 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3561 errout: 3562 if (err < 0) 3563 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3564 } 3565 3566 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3567 __s32 *array, int bytes) 3568 { 3569 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3570 3571 memset(array, 0, bytes); 3572 array[DEVCONF_FORWARDING] = cnf->forwarding; 3573 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3574 array[DEVCONF_MTU6] = cnf->mtu6; 3575 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3576 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3577 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3578 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3579 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3580 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3581 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3582 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3583 #ifdef CONFIG_IPV6_PRIVACY 3584 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3585 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3586 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3587 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3588 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3589 #endif 3590 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3591 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3592 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3593 #ifdef CONFIG_IPV6_ROUTER_PREF 3594 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3595 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3596 #ifdef CONFIG_IPV6_ROUTE_INFO 3597 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3598 #endif 3599 #endif 3600 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3601 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3602 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3603 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3604 #endif 3605 #ifdef CONFIG_IPV6_MROUTE 3606 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3607 #endif 3608 } 3609 3610 static inline size_t inet6_if_nlmsg_size(void) 3611 { 3612 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3613 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3614 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3615 + nla_total_size(4) /* IFLA_MTU */ 3616 + nla_total_size(4) /* IFLA_LINK */ 3617 + nla_total_size( /* IFLA_PROTINFO */ 3618 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3619 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3620 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3621 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3622 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3623 ); 3624 } 3625 3626 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3627 int bytes) 3628 { 3629 int i; 3630 int pad = bytes - sizeof(u64) * items; 3631 BUG_ON(pad < 0); 3632 3633 /* Use put_unaligned() because stats may not be aligned for u64. */ 3634 put_unaligned(items, &stats[0]); 3635 for (i = 1; i < items; i++) 3636 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3637 3638 memset(&stats[items], 0, pad); 3639 } 3640 3641 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3642 int bytes) 3643 { 3644 switch(attrtype) { 3645 case IFLA_INET6_STATS: 3646 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3647 break; 3648 case IFLA_INET6_ICMP6STATS: 3649 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3650 break; 3651 } 3652 } 3653 3654 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3655 u32 pid, u32 seq, int event, unsigned int flags) 3656 { 3657 struct net_device *dev = idev->dev; 3658 struct nlattr *nla; 3659 struct ifinfomsg *hdr; 3660 struct nlmsghdr *nlh; 3661 void *protoinfo; 3662 struct ifla_cacheinfo ci; 3663 3664 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3665 if (nlh == NULL) 3666 return -EMSGSIZE; 3667 3668 hdr = nlmsg_data(nlh); 3669 hdr->ifi_family = AF_INET6; 3670 hdr->__ifi_pad = 0; 3671 hdr->ifi_type = dev->type; 3672 hdr->ifi_index = dev->ifindex; 3673 hdr->ifi_flags = dev_get_flags(dev); 3674 hdr->ifi_change = 0; 3675 3676 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3677 3678 if (dev->addr_len) 3679 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3680 3681 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3682 if (dev->ifindex != dev->iflink) 3683 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3684 3685 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3686 if (protoinfo == NULL) 3687 goto nla_put_failure; 3688 3689 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3690 3691 ci.max_reasm_len = IPV6_MAXPLEN; 3692 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3693 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3694 ci.reachable_time = idev->nd_parms->reachable_time; 3695 ci.retrans_time = idev->nd_parms->retrans_time; 3696 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3697 3698 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3699 if (nla == NULL) 3700 goto nla_put_failure; 3701 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3702 3703 /* XXX - MC not implemented */ 3704 3705 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3706 if (nla == NULL) 3707 goto nla_put_failure; 3708 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3709 3710 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3711 if (nla == NULL) 3712 goto nla_put_failure; 3713 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3714 3715 nla_nest_end(skb, protoinfo); 3716 return nlmsg_end(skb, nlh); 3717 3718 nla_put_failure: 3719 nlmsg_cancel(skb, nlh); 3720 return -EMSGSIZE; 3721 } 3722 3723 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3724 { 3725 struct net *net = sock_net(skb->sk); 3726 int idx, err; 3727 int s_idx = cb->args[0]; 3728 struct net_device *dev; 3729 struct inet6_dev *idev; 3730 3731 read_lock(&dev_base_lock); 3732 idx = 0; 3733 for_each_netdev(net, dev) { 3734 if (idx < s_idx) 3735 goto cont; 3736 if ((idev = in6_dev_get(dev)) == NULL) 3737 goto cont; 3738 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3739 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3740 in6_dev_put(idev); 3741 if (err <= 0) 3742 break; 3743 cont: 3744 idx++; 3745 } 3746 read_unlock(&dev_base_lock); 3747 cb->args[0] = idx; 3748 3749 return skb->len; 3750 } 3751 3752 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3753 { 3754 struct sk_buff *skb; 3755 struct net *net = dev_net(idev->dev); 3756 int err = -ENOBUFS; 3757 3758 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3759 if (skb == NULL) 3760 goto errout; 3761 3762 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3763 if (err < 0) { 3764 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3765 WARN_ON(err == -EMSGSIZE); 3766 kfree_skb(skb); 3767 goto errout; 3768 } 3769 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3770 errout: 3771 if (err < 0) 3772 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3773 } 3774 3775 static inline size_t inet6_prefix_nlmsg_size(void) 3776 { 3777 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3778 + nla_total_size(sizeof(struct in6_addr)) 3779 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3780 } 3781 3782 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3783 struct prefix_info *pinfo, u32 pid, u32 seq, 3784 int event, unsigned int flags) 3785 { 3786 struct prefixmsg *pmsg; 3787 struct nlmsghdr *nlh; 3788 struct prefix_cacheinfo ci; 3789 3790 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3791 if (nlh == NULL) 3792 return -EMSGSIZE; 3793 3794 pmsg = nlmsg_data(nlh); 3795 pmsg->prefix_family = AF_INET6; 3796 pmsg->prefix_pad1 = 0; 3797 pmsg->prefix_pad2 = 0; 3798 pmsg->prefix_ifindex = idev->dev->ifindex; 3799 pmsg->prefix_len = pinfo->prefix_len; 3800 pmsg->prefix_type = pinfo->type; 3801 pmsg->prefix_pad3 = 0; 3802 pmsg->prefix_flags = 0; 3803 if (pinfo->onlink) 3804 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3805 if (pinfo->autoconf) 3806 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3807 3808 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3809 3810 ci.preferred_time = ntohl(pinfo->prefered); 3811 ci.valid_time = ntohl(pinfo->valid); 3812 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3813 3814 return nlmsg_end(skb, nlh); 3815 3816 nla_put_failure: 3817 nlmsg_cancel(skb, nlh); 3818 return -EMSGSIZE; 3819 } 3820 3821 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3822 struct prefix_info *pinfo) 3823 { 3824 struct sk_buff *skb; 3825 struct net *net = dev_net(idev->dev); 3826 int err = -ENOBUFS; 3827 3828 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3829 if (skb == NULL) 3830 goto errout; 3831 3832 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3833 if (err < 0) { 3834 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3835 WARN_ON(err == -EMSGSIZE); 3836 kfree_skb(skb); 3837 goto errout; 3838 } 3839 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3840 errout: 3841 if (err < 0) 3842 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3843 } 3844 3845 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3846 { 3847 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3848 3849 switch (event) { 3850 case RTM_NEWADDR: 3851 /* 3852 * If the address was optimistic 3853 * we inserted the route at the start of 3854 * our DAD process, so we don't need 3855 * to do it again 3856 */ 3857 if (!(ifp->rt->rt6i_node)) 3858 ip6_ins_rt(ifp->rt); 3859 if (ifp->idev->cnf.forwarding) 3860 addrconf_join_anycast(ifp); 3861 break; 3862 case RTM_DELADDR: 3863 if (ifp->idev->cnf.forwarding) 3864 addrconf_leave_anycast(ifp); 3865 addrconf_leave_solict(ifp->idev, &ifp->addr); 3866 dst_hold(&ifp->rt->u.dst); 3867 if (ip6_del_rt(ifp->rt)) 3868 dst_free(&ifp->rt->u.dst); 3869 break; 3870 } 3871 } 3872 3873 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3874 { 3875 rcu_read_lock_bh(); 3876 if (likely(ifp->idev->dead == 0)) 3877 __ipv6_ifa_notify(event, ifp); 3878 rcu_read_unlock_bh(); 3879 } 3880 3881 #ifdef CONFIG_SYSCTL 3882 3883 static 3884 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3885 void __user *buffer, size_t *lenp, loff_t *ppos) 3886 { 3887 int *valp = ctl->data; 3888 int val = *valp; 3889 int ret; 3890 3891 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3892 3893 if (write) 3894 addrconf_fixup_forwarding(ctl, valp, val); 3895 return ret; 3896 } 3897 3898 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3899 int __user *name, int nlen, 3900 void __user *oldval, 3901 size_t __user *oldlenp, 3902 void __user *newval, size_t newlen) 3903 { 3904 int *valp = table->data; 3905 int val = *valp; 3906 int new; 3907 3908 if (!newval || !newlen) 3909 return 0; 3910 if (newlen != sizeof(int)) 3911 return -EINVAL; 3912 if (get_user(new, (int __user *)newval)) 3913 return -EFAULT; 3914 if (new == *valp) 3915 return 0; 3916 if (oldval && oldlenp) { 3917 size_t len; 3918 if (get_user(len, oldlenp)) 3919 return -EFAULT; 3920 if (len) { 3921 if (len > table->maxlen) 3922 len = table->maxlen; 3923 if (copy_to_user(oldval, valp, len)) 3924 return -EFAULT; 3925 if (put_user(len, oldlenp)) 3926 return -EFAULT; 3927 } 3928 } 3929 3930 *valp = new; 3931 addrconf_fixup_forwarding(table, valp, val); 3932 return 1; 3933 } 3934 3935 static struct addrconf_sysctl_table 3936 { 3937 struct ctl_table_header *sysctl_header; 3938 ctl_table addrconf_vars[DEVCONF_MAX+1]; 3939 char *dev_name; 3940 } addrconf_sysctl __read_mostly = { 3941 .sysctl_header = NULL, 3942 .addrconf_vars = { 3943 { 3944 .ctl_name = NET_IPV6_FORWARDING, 3945 .procname = "forwarding", 3946 .data = &ipv6_devconf.forwarding, 3947 .maxlen = sizeof(int), 3948 .mode = 0644, 3949 .proc_handler = &addrconf_sysctl_forward, 3950 .strategy = &addrconf_sysctl_forward_strategy, 3951 }, 3952 { 3953 .ctl_name = NET_IPV6_HOP_LIMIT, 3954 .procname = "hop_limit", 3955 .data = &ipv6_devconf.hop_limit, 3956 .maxlen = sizeof(int), 3957 .mode = 0644, 3958 .proc_handler = proc_dointvec, 3959 }, 3960 { 3961 .ctl_name = NET_IPV6_MTU, 3962 .procname = "mtu", 3963 .data = &ipv6_devconf.mtu6, 3964 .maxlen = sizeof(int), 3965 .mode = 0644, 3966 .proc_handler = &proc_dointvec, 3967 }, 3968 { 3969 .ctl_name = NET_IPV6_ACCEPT_RA, 3970 .procname = "accept_ra", 3971 .data = &ipv6_devconf.accept_ra, 3972 .maxlen = sizeof(int), 3973 .mode = 0644, 3974 .proc_handler = &proc_dointvec, 3975 }, 3976 { 3977 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3978 .procname = "accept_redirects", 3979 .data = &ipv6_devconf.accept_redirects, 3980 .maxlen = sizeof(int), 3981 .mode = 0644, 3982 .proc_handler = &proc_dointvec, 3983 }, 3984 { 3985 .ctl_name = NET_IPV6_AUTOCONF, 3986 .procname = "autoconf", 3987 .data = &ipv6_devconf.autoconf, 3988 .maxlen = sizeof(int), 3989 .mode = 0644, 3990 .proc_handler = &proc_dointvec, 3991 }, 3992 { 3993 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3994 .procname = "dad_transmits", 3995 .data = &ipv6_devconf.dad_transmits, 3996 .maxlen = sizeof(int), 3997 .mode = 0644, 3998 .proc_handler = &proc_dointvec, 3999 }, 4000 { 4001 .ctl_name = NET_IPV6_RTR_SOLICITS, 4002 .procname = "router_solicitations", 4003 .data = &ipv6_devconf.rtr_solicits, 4004 .maxlen = sizeof(int), 4005 .mode = 0644, 4006 .proc_handler = &proc_dointvec, 4007 }, 4008 { 4009 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 4010 .procname = "router_solicitation_interval", 4011 .data = &ipv6_devconf.rtr_solicit_interval, 4012 .maxlen = sizeof(int), 4013 .mode = 0644, 4014 .proc_handler = &proc_dointvec_jiffies, 4015 .strategy = &sysctl_jiffies, 4016 }, 4017 { 4018 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 4019 .procname = "router_solicitation_delay", 4020 .data = &ipv6_devconf.rtr_solicit_delay, 4021 .maxlen = sizeof(int), 4022 .mode = 0644, 4023 .proc_handler = &proc_dointvec_jiffies, 4024 .strategy = &sysctl_jiffies, 4025 }, 4026 { 4027 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 4028 .procname = "force_mld_version", 4029 .data = &ipv6_devconf.force_mld_version, 4030 .maxlen = sizeof(int), 4031 .mode = 0644, 4032 .proc_handler = &proc_dointvec, 4033 }, 4034 #ifdef CONFIG_IPV6_PRIVACY 4035 { 4036 .ctl_name = NET_IPV6_USE_TEMPADDR, 4037 .procname = "use_tempaddr", 4038 .data = &ipv6_devconf.use_tempaddr, 4039 .maxlen = sizeof(int), 4040 .mode = 0644, 4041 .proc_handler = &proc_dointvec, 4042 }, 4043 { 4044 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 4045 .procname = "temp_valid_lft", 4046 .data = &ipv6_devconf.temp_valid_lft, 4047 .maxlen = sizeof(int), 4048 .mode = 0644, 4049 .proc_handler = &proc_dointvec, 4050 }, 4051 { 4052 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 4053 .procname = "temp_prefered_lft", 4054 .data = &ipv6_devconf.temp_prefered_lft, 4055 .maxlen = sizeof(int), 4056 .mode = 0644, 4057 .proc_handler = &proc_dointvec, 4058 }, 4059 { 4060 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4061 .procname = "regen_max_retry", 4062 .data = &ipv6_devconf.regen_max_retry, 4063 .maxlen = sizeof(int), 4064 .mode = 0644, 4065 .proc_handler = &proc_dointvec, 4066 }, 4067 { 4068 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4069 .procname = "max_desync_factor", 4070 .data = &ipv6_devconf.max_desync_factor, 4071 .maxlen = sizeof(int), 4072 .mode = 0644, 4073 .proc_handler = &proc_dointvec, 4074 }, 4075 #endif 4076 { 4077 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4078 .procname = "max_addresses", 4079 .data = &ipv6_devconf.max_addresses, 4080 .maxlen = sizeof(int), 4081 .mode = 0644, 4082 .proc_handler = &proc_dointvec, 4083 }, 4084 { 4085 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4086 .procname = "accept_ra_defrtr", 4087 .data = &ipv6_devconf.accept_ra_defrtr, 4088 .maxlen = sizeof(int), 4089 .mode = 0644, 4090 .proc_handler = &proc_dointvec, 4091 }, 4092 { 4093 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4094 .procname = "accept_ra_pinfo", 4095 .data = &ipv6_devconf.accept_ra_pinfo, 4096 .maxlen = sizeof(int), 4097 .mode = 0644, 4098 .proc_handler = &proc_dointvec, 4099 }, 4100 #ifdef CONFIG_IPV6_ROUTER_PREF 4101 { 4102 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4103 .procname = "accept_ra_rtr_pref", 4104 .data = &ipv6_devconf.accept_ra_rtr_pref, 4105 .maxlen = sizeof(int), 4106 .mode = 0644, 4107 .proc_handler = &proc_dointvec, 4108 }, 4109 { 4110 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4111 .procname = "router_probe_interval", 4112 .data = &ipv6_devconf.rtr_probe_interval, 4113 .maxlen = sizeof(int), 4114 .mode = 0644, 4115 .proc_handler = &proc_dointvec_jiffies, 4116 .strategy = &sysctl_jiffies, 4117 }, 4118 #ifdef CONFIG_IPV6_ROUTE_INFO 4119 { 4120 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4121 .procname = "accept_ra_rt_info_max_plen", 4122 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4123 .maxlen = sizeof(int), 4124 .mode = 0644, 4125 .proc_handler = &proc_dointvec, 4126 }, 4127 #endif 4128 #endif 4129 { 4130 .ctl_name = NET_IPV6_PROXY_NDP, 4131 .procname = "proxy_ndp", 4132 .data = &ipv6_devconf.proxy_ndp, 4133 .maxlen = sizeof(int), 4134 .mode = 0644, 4135 .proc_handler = &proc_dointvec, 4136 }, 4137 { 4138 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4139 .procname = "accept_source_route", 4140 .data = &ipv6_devconf.accept_source_route, 4141 .maxlen = sizeof(int), 4142 .mode = 0644, 4143 .proc_handler = &proc_dointvec, 4144 }, 4145 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4146 { 4147 .ctl_name = CTL_UNNUMBERED, 4148 .procname = "optimistic_dad", 4149 .data = &ipv6_devconf.optimistic_dad, 4150 .maxlen = sizeof(int), 4151 .mode = 0644, 4152 .proc_handler = &proc_dointvec, 4153 4154 }, 4155 #endif 4156 #ifdef CONFIG_IPV6_MROUTE 4157 { 4158 .ctl_name = CTL_UNNUMBERED, 4159 .procname = "mc_forwarding", 4160 .data = &ipv6_devconf.mc_forwarding, 4161 .maxlen = sizeof(int), 4162 .mode = 0644, 4163 .proc_handler = &proc_dointvec, 4164 }, 4165 #endif 4166 { 4167 .ctl_name = 0, /* sentinel */ 4168 } 4169 }, 4170 }; 4171 4172 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4173 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4174 { 4175 int i; 4176 struct addrconf_sysctl_table *t; 4177 4178 #define ADDRCONF_CTL_PATH_DEV 3 4179 4180 struct ctl_path addrconf_ctl_path[] = { 4181 { .procname = "net", .ctl_name = CTL_NET, }, 4182 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4183 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4184 { /* to be set */ }, 4185 { }, 4186 }; 4187 4188 4189 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4190 if (t == NULL) 4191 goto out; 4192 4193 for (i=0; t->addrconf_vars[i].data; i++) { 4194 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4195 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4196 t->addrconf_vars[i].extra2 = net; 4197 } 4198 4199 /* 4200 * Make a copy of dev_name, because '.procname' is regarded as const 4201 * by sysctl and we wouldn't want anyone to change it under our feet 4202 * (see SIOCSIFNAME). 4203 */ 4204 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4205 if (!t->dev_name) 4206 goto free; 4207 4208 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4209 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4210 4211 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4212 t->addrconf_vars); 4213 if (t->sysctl_header == NULL) 4214 goto free_procname; 4215 4216 p->sysctl = t; 4217 return 0; 4218 4219 free_procname: 4220 kfree(t->dev_name); 4221 free: 4222 kfree(t); 4223 out: 4224 return -ENOBUFS; 4225 } 4226 4227 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4228 { 4229 struct addrconf_sysctl_table *t; 4230 4231 if (p->sysctl == NULL) 4232 return; 4233 4234 t = p->sysctl; 4235 p->sysctl = NULL; 4236 unregister_sysctl_table(t->sysctl_header); 4237 kfree(t->dev_name); 4238 kfree(t); 4239 } 4240 4241 static void addrconf_sysctl_register(struct inet6_dev *idev) 4242 { 4243 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4244 NET_IPV6_NEIGH, "ipv6", 4245 &ndisc_ifinfo_sysctl_change, 4246 NULL); 4247 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4248 idev->dev->ifindex, idev, &idev->cnf); 4249 } 4250 4251 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4252 { 4253 __addrconf_sysctl_unregister(&idev->cnf); 4254 neigh_sysctl_unregister(idev->nd_parms); 4255 } 4256 4257 4258 #endif 4259 4260 static int addrconf_init_net(struct net *net) 4261 { 4262 int err; 4263 struct ipv6_devconf *all, *dflt; 4264 4265 err = -ENOMEM; 4266 all = &ipv6_devconf; 4267 dflt = &ipv6_devconf_dflt; 4268 4269 if (net != &init_net) { 4270 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4271 if (all == NULL) 4272 goto err_alloc_all; 4273 4274 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4275 if (dflt == NULL) 4276 goto err_alloc_dflt; 4277 } 4278 4279 net->ipv6.devconf_all = all; 4280 net->ipv6.devconf_dflt = dflt; 4281 4282 #ifdef CONFIG_SYSCTL 4283 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4284 NULL, all); 4285 if (err < 0) 4286 goto err_reg_all; 4287 4288 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4289 NULL, dflt); 4290 if (err < 0) 4291 goto err_reg_dflt; 4292 #endif 4293 return 0; 4294 4295 #ifdef CONFIG_SYSCTL 4296 err_reg_dflt: 4297 __addrconf_sysctl_unregister(all); 4298 err_reg_all: 4299 kfree(dflt); 4300 #endif 4301 err_alloc_dflt: 4302 kfree(all); 4303 err_alloc_all: 4304 return err; 4305 } 4306 4307 static void addrconf_exit_net(struct net *net) 4308 { 4309 #ifdef CONFIG_SYSCTL 4310 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4311 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4312 #endif 4313 if (net != &init_net) { 4314 kfree(net->ipv6.devconf_dflt); 4315 kfree(net->ipv6.devconf_all); 4316 } 4317 } 4318 4319 static struct pernet_operations addrconf_ops = { 4320 .init = addrconf_init_net, 4321 .exit = addrconf_exit_net, 4322 }; 4323 4324 /* 4325 * Device notifier 4326 */ 4327 4328 int register_inet6addr_notifier(struct notifier_block *nb) 4329 { 4330 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4331 } 4332 4333 EXPORT_SYMBOL(register_inet6addr_notifier); 4334 4335 int unregister_inet6addr_notifier(struct notifier_block *nb) 4336 { 4337 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4338 } 4339 4340 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4341 4342 4343 static int addrconf_net_init(struct net *net) 4344 { 4345 return 0; 4346 } 4347 4348 static void addrconf_net_exit(struct net *net) 4349 { 4350 struct net_device *dev; 4351 4352 rtnl_lock(); 4353 /* clean dev list */ 4354 for_each_netdev(net, dev) { 4355 if (__in6_dev_get(dev) == NULL) 4356 continue; 4357 addrconf_ifdown(dev, 1); 4358 } 4359 addrconf_ifdown(net->loopback_dev, 2); 4360 rtnl_unlock(); 4361 } 4362 4363 static struct pernet_operations addrconf_net_ops = { 4364 .init = addrconf_net_init, 4365 .exit = addrconf_net_exit, 4366 }; 4367 4368 /* 4369 * Init / cleanup code 4370 */ 4371 4372 int __init addrconf_init(void) 4373 { 4374 int err; 4375 4376 if ((err = ipv6_addr_label_init()) < 0) { 4377 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4378 err); 4379 return err; 4380 } 4381 4382 register_pernet_subsys(&addrconf_ops); 4383 4384 /* The addrconf netdev notifier requires that loopback_dev 4385 * has it's ipv6 private information allocated and setup 4386 * before it can bring up and give link-local addresses 4387 * to other devices which are up. 4388 * 4389 * Unfortunately, loopback_dev is not necessarily the first 4390 * entry in the global dev_base list of net devices. In fact, 4391 * it is likely to be the very last entry on that list. 4392 * So this causes the notifier registry below to try and 4393 * give link-local addresses to all devices besides loopback_dev 4394 * first, then loopback_dev, which cases all the non-loopback_dev 4395 * devices to fail to get a link-local address. 4396 * 4397 * So, as a temporary fix, allocate the ipv6 structure for 4398 * loopback_dev first by hand. 4399 * Longer term, all of the dependencies ipv6 has upon the loopback 4400 * device and it being up should be removed. 4401 */ 4402 rtnl_lock(); 4403 if (!ipv6_add_dev(init_net.loopback_dev)) 4404 err = -ENOMEM; 4405 rtnl_unlock(); 4406 if (err) 4407 goto errlo; 4408 4409 err = register_pernet_device(&addrconf_net_ops); 4410 if (err) 4411 return err; 4412 4413 register_netdevice_notifier(&ipv6_dev_notf); 4414 4415 addrconf_verify(0); 4416 4417 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4418 if (err < 0) 4419 goto errout; 4420 4421 /* Only the first call to __rtnl_register can fail */ 4422 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4423 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4424 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4425 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4426 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4427 4428 ipv6_addr_label_rtnl_register(); 4429 4430 return 0; 4431 errout: 4432 unregister_netdevice_notifier(&ipv6_dev_notf); 4433 errlo: 4434 unregister_pernet_subsys(&addrconf_ops); 4435 4436 return err; 4437 } 4438 4439 void addrconf_cleanup(void) 4440 { 4441 struct inet6_ifaddr *ifa; 4442 int i; 4443 4444 unregister_netdevice_notifier(&ipv6_dev_notf); 4445 unregister_pernet_device(&addrconf_net_ops); 4446 4447 unregister_pernet_subsys(&addrconf_ops); 4448 4449 rtnl_lock(); 4450 4451 /* 4452 * Check hash table. 4453 */ 4454 write_lock_bh(&addrconf_hash_lock); 4455 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4456 for (ifa=inet6_addr_lst[i]; ifa; ) { 4457 struct inet6_ifaddr *bifa; 4458 4459 bifa = ifa; 4460 ifa = ifa->lst_next; 4461 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4462 /* Do not free it; something is wrong. 4463 Now we can investigate it with debugger. 4464 */ 4465 } 4466 } 4467 write_unlock_bh(&addrconf_hash_lock); 4468 4469 del_timer(&addr_chk_timer); 4470 rtnl_unlock(); 4471 4472 unregister_pernet_subsys(&addrconf_net_ops); 4473 } 4474