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 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #include <linux/errno.h> 42 #include <linux/types.h> 43 #include <linux/kernel.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #ifdef CONFIG_SYSCTL 57 #include <linux/sysctl.h> 58 #endif 59 #include <linux/capability.h> 60 #include <linux/delay.h> 61 #include <linux/notifier.h> 62 #include <linux/string.h> 63 64 #include <net/net_namespace.h> 65 #include <net/sock.h> 66 #include <net/snmp.h> 67 68 #include <net/ipv6.h> 69 #include <net/protocol.h> 70 #include <net/ndisc.h> 71 #include <net/ip6_route.h> 72 #include <net/addrconf.h> 73 #include <net/tcp.h> 74 #include <net/ip.h> 75 #include <net/netlink.h> 76 #include <net/pkt_sched.h> 77 #include <linux/if_tunnel.h> 78 #include <linux/rtnetlink.h> 79 80 #ifdef CONFIG_IPV6_PRIVACY 81 #include <linux/random.h> 82 #endif 83 84 #include <asm/uaccess.h> 85 #include <asm/unaligned.h> 86 87 #include <linux/proc_fs.h> 88 #include <linux/seq_file.h> 89 90 /* Set to 3 to get tracing... */ 91 #define ACONF_DEBUG 2 92 93 #if ACONF_DEBUG >= 3 94 #define ADBG(x) printk x 95 #else 96 #define ADBG(x) 97 #endif 98 99 #define INFINITY_LIFE_TIME 0xFFFFFFFF 100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 101 102 #ifdef CONFIG_SYSCTL 103 static void addrconf_sysctl_register(struct inet6_dev *idev); 104 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 105 #else 106 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 107 { 108 } 109 110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 111 { 112 } 113 #endif 114 115 #ifdef CONFIG_IPV6_PRIVACY 116 static int __ipv6_regen_rndid(struct inet6_dev *idev); 117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 118 static void ipv6_regen_rndid(unsigned long data); 119 120 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 121 #endif 122 123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 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 static 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 .disable_ipv6 = 0, 189 .accept_dad = 1, 190 }; 191 192 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 193 .forwarding = 0, 194 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 195 .mtu6 = IPV6_MIN_MTU, 196 .accept_ra = 1, 197 .accept_redirects = 1, 198 .autoconf = 1, 199 .dad_transmits = 1, 200 .rtr_solicits = MAX_RTR_SOLICITATIONS, 201 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 202 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 203 #ifdef CONFIG_IPV6_PRIVACY 204 .use_tempaddr = 0, 205 .temp_valid_lft = TEMP_VALID_LIFETIME, 206 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 207 .regen_max_retry = REGEN_MAX_RETRY, 208 .max_desync_factor = MAX_DESYNC_FACTOR, 209 #endif 210 .max_addresses = IPV6_MAX_ADDRESSES, 211 .accept_ra_defrtr = 1, 212 .accept_ra_pinfo = 1, 213 #ifdef CONFIG_IPV6_ROUTER_PREF 214 .accept_ra_rtr_pref = 1, 215 .rtr_probe_interval = 60 * HZ, 216 #ifdef CONFIG_IPV6_ROUTE_INFO 217 .accept_ra_rt_info_max_plen = 0, 218 #endif 219 #endif 220 .proxy_ndp = 0, 221 .accept_source_route = 0, /* we do not accept RH0 by default. */ 222 .disable_ipv6 = 0, 223 .accept_dad = 1, 224 }; 225 226 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 227 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 228 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 229 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 230 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 231 232 /* Check if a valid qdisc is available */ 233 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 234 { 235 return !qdisc_tx_is_noop(dev); 236 } 237 238 /* Check if a route is valid prefix route */ 239 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 240 { 241 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0); 242 } 243 244 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 245 { 246 if (del_timer(&ifp->timer)) 247 __in6_ifa_put(ifp); 248 } 249 250 enum addrconf_timer_t 251 { 252 AC_NONE, 253 AC_DAD, 254 AC_RS, 255 }; 256 257 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 258 enum addrconf_timer_t what, 259 unsigned long when) 260 { 261 if (!del_timer(&ifp->timer)) 262 in6_ifa_hold(ifp); 263 264 switch (what) { 265 case AC_DAD: 266 ifp->timer.function = addrconf_dad_timer; 267 break; 268 case AC_RS: 269 ifp->timer.function = addrconf_rs_timer; 270 break; 271 default:; 272 } 273 ifp->timer.expires = jiffies + when; 274 add_timer(&ifp->timer); 275 } 276 277 static int snmp6_alloc_dev(struct inet6_dev *idev) 278 { 279 if (snmp_mib_init((void **)idev->stats.ipv6, 280 sizeof(struct ipstats_mib)) < 0) 281 goto err_ip; 282 if (snmp_mib_init((void **)idev->stats.icmpv6, 283 sizeof(struct icmpv6_mib)) < 0) 284 goto err_icmp; 285 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 286 sizeof(struct icmpv6msg_mib)) < 0) 287 goto err_icmpmsg; 288 289 return 0; 290 291 err_icmpmsg: 292 snmp_mib_free((void **)idev->stats.icmpv6); 293 err_icmp: 294 snmp_mib_free((void **)idev->stats.ipv6); 295 err_ip: 296 return -ENOMEM; 297 } 298 299 static void snmp6_free_dev(struct inet6_dev *idev) 300 { 301 snmp_mib_free((void **)idev->stats.icmpv6msg); 302 snmp_mib_free((void **)idev->stats.icmpv6); 303 snmp_mib_free((void **)idev->stats.ipv6); 304 } 305 306 /* Nobody refers to this device, we may destroy it. */ 307 308 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 309 { 310 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 311 kfree(idev); 312 } 313 314 void in6_dev_finish_destroy(struct inet6_dev *idev) 315 { 316 struct net_device *dev = idev->dev; 317 318 WARN_ON(idev->addr_list != NULL); 319 WARN_ON(idev->mc_list != NULL); 320 321 #ifdef NET_REFCNT_DEBUG 322 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 323 #endif 324 dev_put(dev); 325 if (!idev->dead) { 326 printk("Freeing alive inet6 device %p\n", idev); 327 return; 328 } 329 snmp6_free_dev(idev); 330 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 331 } 332 333 EXPORT_SYMBOL(in6_dev_finish_destroy); 334 335 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 336 { 337 struct inet6_dev *ndev; 338 339 ASSERT_RTNL(); 340 341 if (dev->mtu < IPV6_MIN_MTU) 342 return NULL; 343 344 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 345 346 if (ndev == NULL) 347 return NULL; 348 349 rwlock_init(&ndev->lock); 350 ndev->dev = dev; 351 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 352 ndev->cnf.mtu6 = dev->mtu; 353 ndev->cnf.sysctl = NULL; 354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 355 if (ndev->nd_parms == NULL) { 356 kfree(ndev); 357 return NULL; 358 } 359 if (ndev->cnf.forwarding) 360 dev_disable_lro(dev); 361 /* We refer to the device */ 362 dev_hold(dev); 363 364 if (snmp6_alloc_dev(ndev) < 0) { 365 ADBG((KERN_WARNING 366 "%s(): cannot allocate memory for statistics; dev=%s.\n", 367 __func__, dev->name)); 368 neigh_parms_release(&nd_tbl, ndev->nd_parms); 369 ndev->dead = 1; 370 in6_dev_finish_destroy(ndev); 371 return NULL; 372 } 373 374 if (snmp6_register_dev(ndev) < 0) { 375 ADBG((KERN_WARNING 376 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 377 __func__, dev->name)); 378 neigh_parms_release(&nd_tbl, ndev->nd_parms); 379 ndev->dead = 1; 380 in6_dev_finish_destroy(ndev); 381 return NULL; 382 } 383 384 /* One reference from device. We must do this before 385 * we invoke __ipv6_regen_rndid(). 386 */ 387 in6_dev_hold(ndev); 388 389 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 390 ndev->cnf.accept_dad = -1; 391 392 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 393 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 394 printk(KERN_INFO 395 "%s: Disabled Multicast RS\n", 396 dev->name); 397 ndev->cnf.rtr_solicits = 0; 398 } 399 #endif 400 401 #ifdef CONFIG_IPV6_PRIVACY 402 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 403 if ((dev->flags&IFF_LOOPBACK) || 404 dev->type == ARPHRD_TUNNEL || 405 dev->type == ARPHRD_TUNNEL6 || 406 dev->type == ARPHRD_SIT || 407 dev->type == ARPHRD_NONE) { 408 printk(KERN_INFO 409 "%s: Disabled Privacy Extensions\n", 410 dev->name); 411 ndev->cnf.use_tempaddr = -1; 412 } else { 413 in6_dev_hold(ndev); 414 ipv6_regen_rndid((unsigned long) ndev); 415 } 416 #endif 417 418 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 419 ndev->if_flags |= IF_READY; 420 421 ipv6_mc_init_dev(ndev); 422 ndev->tstamp = jiffies; 423 addrconf_sysctl_register(ndev); 424 /* protected by rtnl_lock */ 425 rcu_assign_pointer(dev->ip6_ptr, ndev); 426 427 /* Join all-node multicast group */ 428 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 429 430 return ndev; 431 } 432 433 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 434 { 435 struct inet6_dev *idev; 436 437 ASSERT_RTNL(); 438 439 if ((idev = __in6_dev_get(dev)) == NULL) { 440 if ((idev = ipv6_add_dev(dev)) == NULL) 441 return NULL; 442 } 443 444 if (dev->flags&IFF_UP) 445 ipv6_mc_up(idev); 446 return idev; 447 } 448 449 #ifdef CONFIG_SYSCTL 450 static void dev_forward_change(struct inet6_dev *idev) 451 { 452 struct net_device *dev; 453 struct inet6_ifaddr *ifa; 454 455 if (!idev) 456 return; 457 dev = idev->dev; 458 if (idev->cnf.forwarding) 459 dev_disable_lro(dev); 460 if (dev && (dev->flags & IFF_MULTICAST)) { 461 if (idev->cnf.forwarding) 462 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 463 else 464 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 465 } 466 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 467 if (ifa->flags&IFA_F_TENTATIVE) 468 continue; 469 if (idev->cnf.forwarding) 470 addrconf_join_anycast(ifa); 471 else 472 addrconf_leave_anycast(ifa); 473 } 474 } 475 476 477 static void addrconf_forward_change(struct net *net, __s32 newf) 478 { 479 struct net_device *dev; 480 struct inet6_dev *idev; 481 482 read_lock(&dev_base_lock); 483 for_each_netdev(net, dev) { 484 rcu_read_lock(); 485 idev = __in6_dev_get(dev); 486 if (idev) { 487 int changed = (!idev->cnf.forwarding) ^ (!newf); 488 idev->cnf.forwarding = newf; 489 if (changed) 490 dev_forward_change(idev); 491 } 492 rcu_read_unlock(); 493 } 494 read_unlock(&dev_base_lock); 495 } 496 497 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 498 { 499 struct net *net; 500 501 net = (struct net *)table->extra2; 502 if (p == &net->ipv6.devconf_dflt->forwarding) 503 return 0; 504 505 if (!rtnl_trylock()) 506 return -ERESTARTSYS; 507 508 if (p == &net->ipv6.devconf_all->forwarding) { 509 __s32 newf = net->ipv6.devconf_all->forwarding; 510 net->ipv6.devconf_dflt->forwarding = newf; 511 addrconf_forward_change(net, newf); 512 } else if ((!*p) ^ (!old)) 513 dev_forward_change((struct inet6_dev *)table->extra1); 514 rtnl_unlock(); 515 516 if (*p) 517 rt6_purge_dflt_routers(net); 518 return 1; 519 } 520 #endif 521 522 /* Nobody refers to this ifaddr, destroy it */ 523 524 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 525 { 526 WARN_ON(ifp->if_next != NULL); 527 WARN_ON(ifp->lst_next != NULL); 528 529 #ifdef NET_REFCNT_DEBUG 530 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 531 #endif 532 533 in6_dev_put(ifp->idev); 534 535 if (del_timer(&ifp->timer)) 536 printk("Timer is still running, when freeing ifa=%p\n", ifp); 537 538 if (!ifp->dead) { 539 printk("Freeing alive inet6 address %p\n", ifp); 540 return; 541 } 542 dst_release(&ifp->rt->u.dst); 543 544 kfree(ifp); 545 } 546 547 static void 548 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 549 { 550 struct inet6_ifaddr *ifa, **ifap; 551 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 552 553 /* 554 * Each device address list is sorted in order of scope - 555 * global before linklocal. 556 */ 557 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 558 ifap = &ifa->if_next) { 559 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 560 break; 561 } 562 563 ifp->if_next = *ifap; 564 *ifap = ifp; 565 } 566 567 /* 568 * Hash function taken from net_alias.c 569 */ 570 static u8 ipv6_addr_hash(const struct in6_addr *addr) 571 { 572 __u32 word; 573 574 /* 575 * We perform the hash function over the last 64 bits of the address 576 * This will include the IEEE address token on links that support it. 577 */ 578 579 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 580 word ^= (word >> 16); 581 word ^= (word >> 8); 582 583 return ((word ^ (word >> 4)) & 0x0f); 584 } 585 586 /* On success it returns ifp with increased reference count */ 587 588 static struct inet6_ifaddr * 589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 590 int scope, u32 flags) 591 { 592 struct inet6_ifaddr *ifa = NULL; 593 struct rt6_info *rt; 594 struct net *net = dev_net(idev->dev); 595 int hash; 596 int err = 0; 597 int addr_type = ipv6_addr_type(addr); 598 599 if (addr_type == IPV6_ADDR_ANY || 600 addr_type & IPV6_ADDR_MULTICAST || 601 (!(idev->dev->flags & IFF_LOOPBACK) && 602 addr_type & IPV6_ADDR_LOOPBACK)) 603 return ERR_PTR(-EADDRNOTAVAIL); 604 605 rcu_read_lock_bh(); 606 if (idev->dead) { 607 err = -ENODEV; /*XXX*/ 608 goto out2; 609 } 610 611 if (idev->cnf.disable_ipv6 || net->ipv6.devconf_all->disable_ipv6) { 612 err = -EACCES; 613 goto out2; 614 } 615 616 write_lock(&addrconf_hash_lock); 617 618 /* Ignore adding duplicate addresses on an interface */ 619 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 620 ADBG(("ipv6_add_addr: already assigned\n")); 621 err = -EEXIST; 622 goto out; 623 } 624 625 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 626 627 if (ifa == NULL) { 628 ADBG(("ipv6_add_addr: malloc failed\n")); 629 err = -ENOBUFS; 630 goto out; 631 } 632 633 rt = addrconf_dst_alloc(idev, addr, 0); 634 if (IS_ERR(rt)) { 635 err = PTR_ERR(rt); 636 goto out; 637 } 638 639 ipv6_addr_copy(&ifa->addr, addr); 640 641 spin_lock_init(&ifa->lock); 642 init_timer(&ifa->timer); 643 ifa->timer.data = (unsigned long) ifa; 644 ifa->scope = scope; 645 ifa->prefix_len = pfxlen; 646 ifa->flags = flags | IFA_F_TENTATIVE; 647 ifa->cstamp = ifa->tstamp = jiffies; 648 649 ifa->rt = rt; 650 651 /* 652 * part one of RFC 4429, section 3.3 653 * We should not configure an address as 654 * optimistic if we do not yet know the link 655 * layer address of our nexhop router 656 */ 657 658 if (rt->rt6i_nexthop == NULL) 659 ifa->flags &= ~IFA_F_OPTIMISTIC; 660 661 ifa->idev = idev; 662 in6_dev_hold(idev); 663 /* For caller */ 664 in6_ifa_hold(ifa); 665 666 /* Add to big hash table */ 667 hash = ipv6_addr_hash(addr); 668 669 ifa->lst_next = inet6_addr_lst[hash]; 670 inet6_addr_lst[hash] = ifa; 671 in6_ifa_hold(ifa); 672 write_unlock(&addrconf_hash_lock); 673 674 write_lock(&idev->lock); 675 /* Add to inet6_dev unicast addr list. */ 676 ipv6_link_dev_addr(idev, ifa); 677 678 #ifdef CONFIG_IPV6_PRIVACY 679 if (ifa->flags&IFA_F_TEMPORARY) { 680 ifa->tmp_next = idev->tempaddr_list; 681 idev->tempaddr_list = ifa; 682 in6_ifa_hold(ifa); 683 } 684 #endif 685 686 in6_ifa_hold(ifa); 687 write_unlock(&idev->lock); 688 out2: 689 rcu_read_unlock_bh(); 690 691 if (likely(err == 0)) 692 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 693 else { 694 kfree(ifa); 695 ifa = ERR_PTR(err); 696 } 697 698 return ifa; 699 out: 700 write_unlock(&addrconf_hash_lock); 701 goto out2; 702 } 703 704 /* This function wants to get referenced ifp and releases it before return */ 705 706 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 707 { 708 struct inet6_ifaddr *ifa, **ifap; 709 struct inet6_dev *idev = ifp->idev; 710 int hash; 711 int deleted = 0, onlink = 0; 712 unsigned long expires = jiffies; 713 714 hash = ipv6_addr_hash(&ifp->addr); 715 716 ifp->dead = 1; 717 718 write_lock_bh(&addrconf_hash_lock); 719 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 720 ifap = &ifa->lst_next) { 721 if (ifa == ifp) { 722 *ifap = ifa->lst_next; 723 __in6_ifa_put(ifp); 724 ifa->lst_next = NULL; 725 break; 726 } 727 } 728 write_unlock_bh(&addrconf_hash_lock); 729 730 write_lock_bh(&idev->lock); 731 #ifdef CONFIG_IPV6_PRIVACY 732 if (ifp->flags&IFA_F_TEMPORARY) { 733 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 734 ifap = &ifa->tmp_next) { 735 if (ifa == ifp) { 736 *ifap = ifa->tmp_next; 737 if (ifp->ifpub) { 738 in6_ifa_put(ifp->ifpub); 739 ifp->ifpub = NULL; 740 } 741 __in6_ifa_put(ifp); 742 ifa->tmp_next = NULL; 743 break; 744 } 745 } 746 } 747 #endif 748 749 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 750 if (ifa == ifp) { 751 *ifap = ifa->if_next; 752 __in6_ifa_put(ifp); 753 ifa->if_next = NULL; 754 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 755 break; 756 deleted = 1; 757 continue; 758 } else if (ifp->flags & IFA_F_PERMANENT) { 759 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 760 ifp->prefix_len)) { 761 if (ifa->flags & IFA_F_PERMANENT) { 762 onlink = 1; 763 if (deleted) 764 break; 765 } else { 766 unsigned long lifetime; 767 768 if (!onlink) 769 onlink = -1; 770 771 spin_lock(&ifa->lock); 772 773 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 774 /* 775 * Note: Because this address is 776 * not permanent, lifetime < 777 * LONG_MAX / HZ here. 778 */ 779 if (time_before(expires, 780 ifa->tstamp + lifetime * HZ)) 781 expires = ifa->tstamp + lifetime * HZ; 782 spin_unlock(&ifa->lock); 783 } 784 } 785 } 786 ifap = &ifa->if_next; 787 } 788 write_unlock_bh(&idev->lock); 789 790 addrconf_del_timer(ifp); 791 792 ipv6_ifa_notify(RTM_DELADDR, ifp); 793 794 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 795 796 /* 797 * Purge or update corresponding prefix 798 * 799 * 1) we don't purge prefix here if address was not permanent. 800 * prefix is managed by its own lifetime. 801 * 2) if there're no addresses, delete prefix. 802 * 3) if there're still other permanent address(es), 803 * corresponding prefix is still permanent. 804 * 4) otherwise, update prefix lifetime to the 805 * longest valid lifetime among the corresponding 806 * addresses on the device. 807 * Note: subsequent RA will update lifetime. 808 * 809 * --yoshfuji 810 */ 811 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 812 struct in6_addr prefix; 813 struct rt6_info *rt; 814 struct net *net = dev_net(ifp->idev->dev); 815 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 816 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 817 818 if (rt && addrconf_is_prefix_route(rt)) { 819 if (onlink == 0) { 820 ip6_del_rt(rt); 821 rt = NULL; 822 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 823 rt->rt6i_expires = expires; 824 rt->rt6i_flags |= RTF_EXPIRES; 825 } 826 } 827 dst_release(&rt->u.dst); 828 } 829 830 in6_ifa_put(ifp); 831 } 832 833 #ifdef CONFIG_IPV6_PRIVACY 834 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 835 { 836 struct inet6_dev *idev = ifp->idev; 837 struct in6_addr addr, *tmpaddr; 838 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 839 unsigned long regen_advance; 840 int tmp_plen; 841 int ret = 0; 842 int max_addresses; 843 u32 addr_flags; 844 845 write_lock(&idev->lock); 846 if (ift) { 847 spin_lock_bh(&ift->lock); 848 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 849 spin_unlock_bh(&ift->lock); 850 tmpaddr = &addr; 851 } else { 852 tmpaddr = NULL; 853 } 854 retry: 855 in6_dev_hold(idev); 856 if (idev->cnf.use_tempaddr <= 0) { 857 write_unlock(&idev->lock); 858 printk(KERN_INFO 859 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 860 in6_dev_put(idev); 861 ret = -1; 862 goto out; 863 } 864 spin_lock_bh(&ifp->lock); 865 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 866 idev->cnf.use_tempaddr = -1; /*XXX*/ 867 spin_unlock_bh(&ifp->lock); 868 write_unlock(&idev->lock); 869 printk(KERN_WARNING 870 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 871 in6_dev_put(idev); 872 ret = -1; 873 goto out; 874 } 875 in6_ifa_hold(ifp); 876 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 877 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 878 spin_unlock_bh(&ifp->lock); 879 write_unlock(&idev->lock); 880 printk(KERN_WARNING 881 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 882 in6_ifa_put(ifp); 883 in6_dev_put(idev); 884 ret = -1; 885 goto out; 886 } 887 memcpy(&addr.s6_addr[8], idev->rndid, 8); 888 tmp_valid_lft = min_t(__u32, 889 ifp->valid_lft, 890 idev->cnf.temp_valid_lft); 891 tmp_prefered_lft = min_t(__u32, 892 ifp->prefered_lft, 893 idev->cnf.temp_prefered_lft - desync_factor / HZ); 894 tmp_plen = ifp->prefix_len; 895 max_addresses = idev->cnf.max_addresses; 896 tmp_cstamp = ifp->cstamp; 897 tmp_tstamp = ifp->tstamp; 898 spin_unlock_bh(&ifp->lock); 899 900 regen_advance = idev->cnf.regen_max_retry * 901 idev->cnf.dad_transmits * 902 idev->nd_parms->retrans_time / HZ; 903 write_unlock(&idev->lock); 904 905 /* A temporary address is created only if this calculated Preferred 906 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 907 * an implementation must not create a temporary address with a zero 908 * Preferred Lifetime. 909 */ 910 if (tmp_prefered_lft <= regen_advance) { 911 in6_ifa_put(ifp); 912 in6_dev_put(idev); 913 ret = -1; 914 goto out; 915 } 916 917 addr_flags = IFA_F_TEMPORARY; 918 /* set in addrconf_prefix_rcv() */ 919 if (ifp->flags & IFA_F_OPTIMISTIC) 920 addr_flags |= IFA_F_OPTIMISTIC; 921 922 ift = !max_addresses || 923 ipv6_count_addresses(idev) < max_addresses ? 924 ipv6_add_addr(idev, &addr, tmp_plen, 925 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 926 addr_flags) : NULL; 927 if (!ift || IS_ERR(ift)) { 928 in6_ifa_put(ifp); 929 in6_dev_put(idev); 930 printk(KERN_INFO 931 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 932 tmpaddr = &addr; 933 write_lock(&idev->lock); 934 goto retry; 935 } 936 937 spin_lock_bh(&ift->lock); 938 ift->ifpub = ifp; 939 ift->valid_lft = tmp_valid_lft; 940 ift->prefered_lft = tmp_prefered_lft; 941 ift->cstamp = tmp_cstamp; 942 ift->tstamp = tmp_tstamp; 943 spin_unlock_bh(&ift->lock); 944 945 addrconf_dad_start(ift, 0); 946 in6_ifa_put(ift); 947 in6_dev_put(idev); 948 out: 949 return ret; 950 } 951 #endif 952 953 /* 954 * Choose an appropriate source address (RFC3484) 955 */ 956 enum { 957 IPV6_SADDR_RULE_INIT = 0, 958 IPV6_SADDR_RULE_LOCAL, 959 IPV6_SADDR_RULE_SCOPE, 960 IPV6_SADDR_RULE_PREFERRED, 961 #ifdef CONFIG_IPV6_MIP6 962 IPV6_SADDR_RULE_HOA, 963 #endif 964 IPV6_SADDR_RULE_OIF, 965 IPV6_SADDR_RULE_LABEL, 966 #ifdef CONFIG_IPV6_PRIVACY 967 IPV6_SADDR_RULE_PRIVACY, 968 #endif 969 IPV6_SADDR_RULE_ORCHID, 970 IPV6_SADDR_RULE_PREFIX, 971 IPV6_SADDR_RULE_MAX 972 }; 973 974 struct ipv6_saddr_score { 975 int rule; 976 int addr_type; 977 struct inet6_ifaddr *ifa; 978 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 979 int scopedist; 980 int matchlen; 981 }; 982 983 struct ipv6_saddr_dst { 984 const struct in6_addr *addr; 985 int ifindex; 986 int scope; 987 int label; 988 unsigned int prefs; 989 }; 990 991 static inline int ipv6_saddr_preferred(int type) 992 { 993 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 994 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 995 return 1; 996 return 0; 997 } 998 999 static int ipv6_get_saddr_eval(struct net *net, 1000 struct ipv6_saddr_score *score, 1001 struct ipv6_saddr_dst *dst, 1002 int i) 1003 { 1004 int ret; 1005 1006 if (i <= score->rule) { 1007 switch (i) { 1008 case IPV6_SADDR_RULE_SCOPE: 1009 ret = score->scopedist; 1010 break; 1011 case IPV6_SADDR_RULE_PREFIX: 1012 ret = score->matchlen; 1013 break; 1014 default: 1015 ret = !!test_bit(i, score->scorebits); 1016 } 1017 goto out; 1018 } 1019 1020 switch (i) { 1021 case IPV6_SADDR_RULE_INIT: 1022 /* Rule 0: remember if hiscore is not ready yet */ 1023 ret = !!score->ifa; 1024 break; 1025 case IPV6_SADDR_RULE_LOCAL: 1026 /* Rule 1: Prefer same address */ 1027 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1028 break; 1029 case IPV6_SADDR_RULE_SCOPE: 1030 /* Rule 2: Prefer appropriate scope 1031 * 1032 * ret 1033 * ^ 1034 * -1 | d 15 1035 * ---+--+-+---> scope 1036 * | 1037 * | d is scope of the destination. 1038 * B-d | \ 1039 * | \ <- smaller scope is better if 1040 * B-15 | \ if scope is enough for destinaion. 1041 * | ret = B - scope (-1 <= scope >= d <= 15). 1042 * d-C-1 | / 1043 * |/ <- greater is better 1044 * -C / if scope is not enough for destination. 1045 * /| ret = scope - C (-1 <= d < scope <= 15). 1046 * 1047 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1048 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1049 * Assume B = 0 and we get C > 29. 1050 */ 1051 ret = __ipv6_addr_src_scope(score->addr_type); 1052 if (ret >= dst->scope) 1053 ret = -ret; 1054 else 1055 ret -= 128; /* 30 is enough */ 1056 score->scopedist = ret; 1057 break; 1058 case IPV6_SADDR_RULE_PREFERRED: 1059 /* Rule 3: Avoid deprecated and optimistic addresses */ 1060 ret = ipv6_saddr_preferred(score->addr_type) || 1061 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1062 break; 1063 #ifdef CONFIG_IPV6_MIP6 1064 case IPV6_SADDR_RULE_HOA: 1065 { 1066 /* Rule 4: Prefer home address */ 1067 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1068 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1069 break; 1070 } 1071 #endif 1072 case IPV6_SADDR_RULE_OIF: 1073 /* Rule 5: Prefer outgoing interface */ 1074 ret = (!dst->ifindex || 1075 dst->ifindex == score->ifa->idev->dev->ifindex); 1076 break; 1077 case IPV6_SADDR_RULE_LABEL: 1078 /* Rule 6: Prefer matching label */ 1079 ret = ipv6_addr_label(net, 1080 &score->ifa->addr, score->addr_type, 1081 score->ifa->idev->dev->ifindex) == dst->label; 1082 break; 1083 #ifdef CONFIG_IPV6_PRIVACY 1084 case IPV6_SADDR_RULE_PRIVACY: 1085 { 1086 /* Rule 7: Prefer public address 1087 * Note: prefer temprary address if use_tempaddr >= 2 1088 */ 1089 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1090 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1091 score->ifa->idev->cnf.use_tempaddr >= 2; 1092 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1093 break; 1094 } 1095 #endif 1096 case IPV6_SADDR_RULE_ORCHID: 1097 /* Rule 8-: Prefer ORCHID vs ORCHID or 1098 * non-ORCHID vs non-ORCHID 1099 */ 1100 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1101 ipv6_addr_orchid(dst->addr)); 1102 break; 1103 case IPV6_SADDR_RULE_PREFIX: 1104 /* Rule 8: Use longest matching prefix */ 1105 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1106 dst->addr); 1107 break; 1108 default: 1109 ret = 0; 1110 } 1111 1112 if (ret) 1113 __set_bit(i, score->scorebits); 1114 score->rule = i; 1115 out: 1116 return ret; 1117 } 1118 1119 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1120 const struct in6_addr *daddr, unsigned int prefs, 1121 struct in6_addr *saddr) 1122 { 1123 struct ipv6_saddr_score scores[2], 1124 *score = &scores[0], *hiscore = &scores[1]; 1125 struct ipv6_saddr_dst dst; 1126 struct net_device *dev; 1127 int dst_type; 1128 1129 dst_type = __ipv6_addr_type(daddr); 1130 dst.addr = daddr; 1131 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1132 dst.scope = __ipv6_addr_src_scope(dst_type); 1133 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1134 dst.prefs = prefs; 1135 1136 hiscore->rule = -1; 1137 hiscore->ifa = NULL; 1138 1139 read_lock(&dev_base_lock); 1140 rcu_read_lock(); 1141 1142 for_each_netdev(net, dev) { 1143 struct inet6_dev *idev; 1144 1145 /* Candidate Source Address (section 4) 1146 * - multicast and link-local destination address, 1147 * the set of candidate source address MUST only 1148 * include addresses assigned to interfaces 1149 * belonging to the same link as the outgoing 1150 * interface. 1151 * (- For site-local destination addresses, the 1152 * set of candidate source addresses MUST only 1153 * include addresses assigned to interfaces 1154 * belonging to the same site as the outgoing 1155 * interface.) 1156 */ 1157 if (((dst_type & IPV6_ADDR_MULTICAST) || 1158 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1159 dst.ifindex && dev->ifindex != dst.ifindex) 1160 continue; 1161 1162 idev = __in6_dev_get(dev); 1163 if (!idev) 1164 continue; 1165 1166 read_lock_bh(&idev->lock); 1167 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1168 int i; 1169 1170 /* 1171 * - Tentative Address (RFC2462 section 5.4) 1172 * - A tentative address is not considered 1173 * "assigned to an interface" in the traditional 1174 * sense, unless it is also flagged as optimistic. 1175 * - Candidate Source Address (section 4) 1176 * - In any case, anycast addresses, multicast 1177 * addresses, and the unspecified address MUST 1178 * NOT be included in a candidate set. 1179 */ 1180 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1181 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1182 continue; 1183 1184 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1185 1186 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1187 score->addr_type & IPV6_ADDR_MULTICAST)) { 1188 LIMIT_NETDEBUG(KERN_DEBUG 1189 "ADDRCONF: unspecified / multicast address " 1190 "assigned as unicast address on %s", 1191 dev->name); 1192 continue; 1193 } 1194 1195 score->rule = -1; 1196 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1197 1198 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1199 int minihiscore, miniscore; 1200 1201 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1202 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1203 1204 if (minihiscore > miniscore) { 1205 if (i == IPV6_SADDR_RULE_SCOPE && 1206 score->scopedist > 0) { 1207 /* 1208 * special case: 1209 * each remaining entry 1210 * has too small (not enough) 1211 * scope, because ifa entries 1212 * are sorted by their scope 1213 * values. 1214 */ 1215 goto try_nextdev; 1216 } 1217 break; 1218 } else if (minihiscore < miniscore) { 1219 if (hiscore->ifa) 1220 in6_ifa_put(hiscore->ifa); 1221 1222 in6_ifa_hold(score->ifa); 1223 1224 swap(hiscore, score); 1225 1226 /* restore our iterator */ 1227 score->ifa = hiscore->ifa; 1228 1229 break; 1230 } 1231 } 1232 } 1233 try_nextdev: 1234 read_unlock_bh(&idev->lock); 1235 } 1236 rcu_read_unlock(); 1237 read_unlock(&dev_base_lock); 1238 1239 if (!hiscore->ifa) 1240 return -EADDRNOTAVAIL; 1241 1242 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1243 in6_ifa_put(hiscore->ifa); 1244 return 0; 1245 } 1246 1247 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1248 1249 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1250 unsigned char banned_flags) 1251 { 1252 struct inet6_dev *idev; 1253 int err = -EADDRNOTAVAIL; 1254 1255 rcu_read_lock(); 1256 if ((idev = __in6_dev_get(dev)) != NULL) { 1257 struct inet6_ifaddr *ifp; 1258 1259 read_lock_bh(&idev->lock); 1260 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1261 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1262 ipv6_addr_copy(addr, &ifp->addr); 1263 err = 0; 1264 break; 1265 } 1266 } 1267 read_unlock_bh(&idev->lock); 1268 } 1269 rcu_read_unlock(); 1270 return err; 1271 } 1272 1273 static int ipv6_count_addresses(struct inet6_dev *idev) 1274 { 1275 int cnt = 0; 1276 struct inet6_ifaddr *ifp; 1277 1278 read_lock_bh(&idev->lock); 1279 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1280 cnt++; 1281 read_unlock_bh(&idev->lock); 1282 return cnt; 1283 } 1284 1285 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1286 struct net_device *dev, int strict) 1287 { 1288 struct inet6_ifaddr * ifp; 1289 u8 hash = ipv6_addr_hash(addr); 1290 1291 read_lock_bh(&addrconf_hash_lock); 1292 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1293 if (!net_eq(dev_net(ifp->idev->dev), net)) 1294 continue; 1295 if (ipv6_addr_equal(&ifp->addr, addr) && 1296 !(ifp->flags&IFA_F_TENTATIVE)) { 1297 if (dev == NULL || ifp->idev->dev == dev || 1298 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1299 break; 1300 } 1301 } 1302 read_unlock_bh(&addrconf_hash_lock); 1303 return ifp != NULL; 1304 } 1305 EXPORT_SYMBOL(ipv6_chk_addr); 1306 1307 static 1308 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1309 struct net_device *dev) 1310 { 1311 struct inet6_ifaddr * ifp; 1312 u8 hash = ipv6_addr_hash(addr); 1313 1314 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1315 if (!net_eq(dev_net(ifp->idev->dev), net)) 1316 continue; 1317 if (ipv6_addr_equal(&ifp->addr, addr)) { 1318 if (dev == NULL || ifp->idev->dev == dev) 1319 break; 1320 } 1321 } 1322 return ifp != NULL; 1323 } 1324 1325 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1326 { 1327 struct inet6_dev *idev; 1328 struct inet6_ifaddr *ifa; 1329 int onlink; 1330 1331 onlink = 0; 1332 rcu_read_lock(); 1333 idev = __in6_dev_get(dev); 1334 if (idev) { 1335 read_lock_bh(&idev->lock); 1336 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1337 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1338 ifa->prefix_len); 1339 if (onlink) 1340 break; 1341 } 1342 read_unlock_bh(&idev->lock); 1343 } 1344 rcu_read_unlock(); 1345 return onlink; 1346 } 1347 1348 EXPORT_SYMBOL(ipv6_chk_prefix); 1349 1350 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1351 struct net_device *dev, int strict) 1352 { 1353 struct inet6_ifaddr * ifp; 1354 u8 hash = ipv6_addr_hash(addr); 1355 1356 read_lock_bh(&addrconf_hash_lock); 1357 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1358 if (!net_eq(dev_net(ifp->idev->dev), net)) 1359 continue; 1360 if (ipv6_addr_equal(&ifp->addr, addr)) { 1361 if (dev == NULL || ifp->idev->dev == dev || 1362 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1363 in6_ifa_hold(ifp); 1364 break; 1365 } 1366 } 1367 } 1368 read_unlock_bh(&addrconf_hash_lock); 1369 1370 return ifp; 1371 } 1372 1373 /* Gets referenced address, destroys ifaddr */ 1374 1375 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1376 { 1377 if (ifp->flags&IFA_F_PERMANENT) { 1378 spin_lock_bh(&ifp->lock); 1379 addrconf_del_timer(ifp); 1380 ifp->flags |= IFA_F_TENTATIVE; 1381 spin_unlock_bh(&ifp->lock); 1382 in6_ifa_put(ifp); 1383 #ifdef CONFIG_IPV6_PRIVACY 1384 } else if (ifp->flags&IFA_F_TEMPORARY) { 1385 struct inet6_ifaddr *ifpub; 1386 spin_lock_bh(&ifp->lock); 1387 ifpub = ifp->ifpub; 1388 if (ifpub) { 1389 in6_ifa_hold(ifpub); 1390 spin_unlock_bh(&ifp->lock); 1391 ipv6_create_tempaddr(ifpub, ifp); 1392 in6_ifa_put(ifpub); 1393 } else { 1394 spin_unlock_bh(&ifp->lock); 1395 } 1396 ipv6_del_addr(ifp); 1397 #endif 1398 } else 1399 ipv6_del_addr(ifp); 1400 } 1401 1402 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1403 { 1404 struct inet6_dev *idev = ifp->idev; 1405 1406 if (net_ratelimit()) 1407 printk(KERN_INFO "%s: IPv6 duplicate address detected!\n", 1408 ifp->idev->dev->name); 1409 1410 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1411 struct in6_addr addr; 1412 1413 addr.s6_addr32[0] = htonl(0xfe800000); 1414 addr.s6_addr32[1] = 0; 1415 1416 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1417 ipv6_addr_equal(&ifp->addr, &addr)) { 1418 /* DAD failed for link-local based on MAC address */ 1419 idev->cnf.disable_ipv6 = 1; 1420 1421 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1422 ifp->idev->dev->name); 1423 } 1424 } 1425 1426 addrconf_dad_stop(ifp); 1427 } 1428 1429 /* Join to solicited addr multicast group. */ 1430 1431 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1432 { 1433 struct in6_addr maddr; 1434 1435 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1436 return; 1437 1438 addrconf_addr_solict_mult(addr, &maddr); 1439 ipv6_dev_mc_inc(dev, &maddr); 1440 } 1441 1442 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1443 { 1444 struct in6_addr maddr; 1445 1446 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1447 return; 1448 1449 addrconf_addr_solict_mult(addr, &maddr); 1450 __ipv6_dev_mc_dec(idev, &maddr); 1451 } 1452 1453 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1454 { 1455 struct in6_addr addr; 1456 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1457 if (ipv6_addr_any(&addr)) 1458 return; 1459 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1460 } 1461 1462 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1463 { 1464 struct in6_addr addr; 1465 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1466 if (ipv6_addr_any(&addr)) 1467 return; 1468 __ipv6_dev_ac_dec(ifp->idev, &addr); 1469 } 1470 1471 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1472 { 1473 if (dev->addr_len != ETH_ALEN) 1474 return -1; 1475 memcpy(eui, dev->dev_addr, 3); 1476 memcpy(eui + 5, dev->dev_addr + 3, 3); 1477 1478 /* 1479 * The zSeries OSA network cards can be shared among various 1480 * OS instances, but the OSA cards have only one MAC address. 1481 * This leads to duplicate address conflicts in conjunction 1482 * with IPv6 if more than one instance uses the same card. 1483 * 1484 * The driver for these cards can deliver a unique 16-bit 1485 * identifier for each instance sharing the same card. It is 1486 * placed instead of 0xFFFE in the interface identifier. The 1487 * "u" bit of the interface identifier is not inverted in this 1488 * case. Hence the resulting interface identifier has local 1489 * scope according to RFC2373. 1490 */ 1491 if (dev->dev_id) { 1492 eui[3] = (dev->dev_id >> 8) & 0xFF; 1493 eui[4] = dev->dev_id & 0xFF; 1494 } else { 1495 eui[3] = 0xFF; 1496 eui[4] = 0xFE; 1497 eui[0] ^= 2; 1498 } 1499 return 0; 1500 } 1501 1502 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1503 { 1504 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1505 if (dev->addr_len != ARCNET_ALEN) 1506 return -1; 1507 memset(eui, 0, 7); 1508 eui[7] = *(u8*)dev->dev_addr; 1509 return 0; 1510 } 1511 1512 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1513 { 1514 if (dev->addr_len != INFINIBAND_ALEN) 1515 return -1; 1516 memcpy(eui, dev->dev_addr + 12, 8); 1517 eui[0] |= 2; 1518 return 0; 1519 } 1520 1521 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1522 { 1523 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1524 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1525 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1526 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1527 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1528 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1529 eui[1] = 0; 1530 eui[2] = 0x5E; 1531 eui[3] = 0xFE; 1532 memcpy(eui + 4, &addr, 4); 1533 return 0; 1534 } 1535 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1536 1537 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1538 { 1539 if (dev->priv_flags & IFF_ISATAP) 1540 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1541 return -1; 1542 } 1543 1544 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1545 { 1546 switch (dev->type) { 1547 case ARPHRD_ETHER: 1548 case ARPHRD_FDDI: 1549 case ARPHRD_IEEE802_TR: 1550 return addrconf_ifid_eui48(eui, dev); 1551 case ARPHRD_ARCNET: 1552 return addrconf_ifid_arcnet(eui, dev); 1553 case ARPHRD_INFINIBAND: 1554 return addrconf_ifid_infiniband(eui, dev); 1555 case ARPHRD_SIT: 1556 return addrconf_ifid_sit(eui, dev); 1557 } 1558 return -1; 1559 } 1560 1561 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1562 { 1563 int err = -1; 1564 struct inet6_ifaddr *ifp; 1565 1566 read_lock_bh(&idev->lock); 1567 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1568 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1569 memcpy(eui, ifp->addr.s6_addr+8, 8); 1570 err = 0; 1571 break; 1572 } 1573 } 1574 read_unlock_bh(&idev->lock); 1575 return err; 1576 } 1577 1578 #ifdef CONFIG_IPV6_PRIVACY 1579 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1580 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1581 { 1582 regen: 1583 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1584 idev->rndid[0] &= ~0x02; 1585 1586 /* 1587 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1588 * check if generated address is not inappropriate 1589 * 1590 * - Reserved subnet anycast (RFC 2526) 1591 * 11111101 11....11 1xxxxxxx 1592 * - ISATAP (RFC4214) 6.1 1593 * 00-00-5E-FE-xx-xx-xx-xx 1594 * - value 0 1595 * - XXX: already assigned to an address on the device 1596 */ 1597 if (idev->rndid[0] == 0xfd && 1598 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1599 (idev->rndid[7]&0x80)) 1600 goto regen; 1601 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1602 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1603 goto regen; 1604 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1605 goto regen; 1606 } 1607 1608 return 0; 1609 } 1610 1611 static void ipv6_regen_rndid(unsigned long data) 1612 { 1613 struct inet6_dev *idev = (struct inet6_dev *) data; 1614 unsigned long expires; 1615 1616 rcu_read_lock_bh(); 1617 write_lock_bh(&idev->lock); 1618 1619 if (idev->dead) 1620 goto out; 1621 1622 if (__ipv6_regen_rndid(idev) < 0) 1623 goto out; 1624 1625 expires = jiffies + 1626 idev->cnf.temp_prefered_lft * HZ - 1627 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1628 if (time_before(expires, jiffies)) { 1629 printk(KERN_WARNING 1630 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1631 idev->dev->name); 1632 goto out; 1633 } 1634 1635 if (!mod_timer(&idev->regen_timer, expires)) 1636 in6_dev_hold(idev); 1637 1638 out: 1639 write_unlock_bh(&idev->lock); 1640 rcu_read_unlock_bh(); 1641 in6_dev_put(idev); 1642 } 1643 1644 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1645 int ret = 0; 1646 1647 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1648 ret = __ipv6_regen_rndid(idev); 1649 return ret; 1650 } 1651 #endif 1652 1653 /* 1654 * Add prefix route. 1655 */ 1656 1657 static void 1658 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1659 unsigned long expires, u32 flags) 1660 { 1661 struct fib6_config cfg = { 1662 .fc_table = RT6_TABLE_PREFIX, 1663 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1664 .fc_ifindex = dev->ifindex, 1665 .fc_expires = expires, 1666 .fc_dst_len = plen, 1667 .fc_flags = RTF_UP | flags, 1668 .fc_nlinfo.nl_net = dev_net(dev), 1669 .fc_protocol = RTPROT_KERNEL, 1670 }; 1671 1672 ipv6_addr_copy(&cfg.fc_dst, pfx); 1673 1674 /* Prevent useless cloning on PtP SIT. 1675 This thing is done here expecting that the whole 1676 class of non-broadcast devices need not cloning. 1677 */ 1678 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1679 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1680 cfg.fc_flags |= RTF_NONEXTHOP; 1681 #endif 1682 1683 ip6_route_add(&cfg); 1684 } 1685 1686 /* Create "default" multicast route to the interface */ 1687 1688 static void addrconf_add_mroute(struct net_device *dev) 1689 { 1690 struct fib6_config cfg = { 1691 .fc_table = RT6_TABLE_LOCAL, 1692 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1693 .fc_ifindex = dev->ifindex, 1694 .fc_dst_len = 8, 1695 .fc_flags = RTF_UP, 1696 .fc_nlinfo.nl_net = dev_net(dev), 1697 }; 1698 1699 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1700 1701 ip6_route_add(&cfg); 1702 } 1703 1704 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1705 static void sit_route_add(struct net_device *dev) 1706 { 1707 struct fib6_config cfg = { 1708 .fc_table = RT6_TABLE_MAIN, 1709 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1710 .fc_ifindex = dev->ifindex, 1711 .fc_dst_len = 96, 1712 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1713 .fc_nlinfo.nl_net = dev_net(dev), 1714 }; 1715 1716 /* prefix length - 96 bits "::d.d.d.d" */ 1717 ip6_route_add(&cfg); 1718 } 1719 #endif 1720 1721 static void addrconf_add_lroute(struct net_device *dev) 1722 { 1723 struct in6_addr addr; 1724 1725 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1726 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1727 } 1728 1729 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1730 { 1731 struct inet6_dev *idev; 1732 1733 ASSERT_RTNL(); 1734 1735 if ((idev = ipv6_find_idev(dev)) == NULL) 1736 return NULL; 1737 1738 /* Add default multicast route */ 1739 addrconf_add_mroute(dev); 1740 1741 /* Add link local route */ 1742 addrconf_add_lroute(dev); 1743 return idev; 1744 } 1745 1746 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1747 { 1748 struct prefix_info *pinfo; 1749 __u32 valid_lft; 1750 __u32 prefered_lft; 1751 int addr_type; 1752 struct inet6_dev *in6_dev; 1753 1754 pinfo = (struct prefix_info *) opt; 1755 1756 if (len < sizeof(struct prefix_info)) { 1757 ADBG(("addrconf: prefix option too short\n")); 1758 return; 1759 } 1760 1761 /* 1762 * Validation checks ([ADDRCONF], page 19) 1763 */ 1764 1765 addr_type = ipv6_addr_type(&pinfo->prefix); 1766 1767 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1768 return; 1769 1770 valid_lft = ntohl(pinfo->valid); 1771 prefered_lft = ntohl(pinfo->prefered); 1772 1773 if (prefered_lft > valid_lft) { 1774 if (net_ratelimit()) 1775 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1776 return; 1777 } 1778 1779 in6_dev = in6_dev_get(dev); 1780 1781 if (in6_dev == NULL) { 1782 if (net_ratelimit()) 1783 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1784 return; 1785 } 1786 1787 /* 1788 * Two things going on here: 1789 * 1) Add routes for on-link prefixes 1790 * 2) Configure prefixes with the auto flag set 1791 */ 1792 1793 if (pinfo->onlink) { 1794 struct rt6_info *rt; 1795 unsigned long rt_expires; 1796 1797 /* Avoid arithmetic overflow. Really, we could 1798 * save rt_expires in seconds, likely valid_lft, 1799 * but it would require division in fib gc, that it 1800 * not good. 1801 */ 1802 if (HZ > USER_HZ) 1803 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1804 else 1805 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1806 1807 if (addrconf_finite_timeout(rt_expires)) 1808 rt_expires *= HZ; 1809 1810 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL, 1811 dev->ifindex, 1); 1812 1813 if (rt && addrconf_is_prefix_route(rt)) { 1814 /* Autoconf prefix route */ 1815 if (valid_lft == 0) { 1816 ip6_del_rt(rt); 1817 rt = NULL; 1818 } else if (addrconf_finite_timeout(rt_expires)) { 1819 /* not infinity */ 1820 rt->rt6i_expires = jiffies + rt_expires; 1821 rt->rt6i_flags |= RTF_EXPIRES; 1822 } else { 1823 rt->rt6i_flags &= ~RTF_EXPIRES; 1824 rt->rt6i_expires = 0; 1825 } 1826 } else if (valid_lft) { 1827 clock_t expires = 0; 1828 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1829 if (addrconf_finite_timeout(rt_expires)) { 1830 /* not infinity */ 1831 flags |= RTF_EXPIRES; 1832 expires = jiffies_to_clock_t(rt_expires); 1833 } 1834 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1835 dev, expires, flags); 1836 } 1837 if (rt) 1838 dst_release(&rt->u.dst); 1839 } 1840 1841 /* Try to figure out our local address for this prefix */ 1842 1843 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1844 struct inet6_ifaddr * ifp; 1845 struct in6_addr addr; 1846 int create = 0, update_lft = 0; 1847 struct net *net = dev_net(dev); 1848 1849 if (pinfo->prefix_len == 64) { 1850 memcpy(&addr, &pinfo->prefix, 8); 1851 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1852 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1853 in6_dev_put(in6_dev); 1854 return; 1855 } 1856 goto ok; 1857 } 1858 if (net_ratelimit()) 1859 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1860 pinfo->prefix_len); 1861 in6_dev_put(in6_dev); 1862 return; 1863 1864 ok: 1865 1866 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1867 1868 if (ifp == NULL && valid_lft) { 1869 int max_addresses = in6_dev->cnf.max_addresses; 1870 u32 addr_flags = 0; 1871 1872 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1873 if (in6_dev->cnf.optimistic_dad && 1874 !net->ipv6.devconf_all->forwarding) 1875 addr_flags = IFA_F_OPTIMISTIC; 1876 #endif 1877 1878 /* Do not allow to create too much of autoconfigured 1879 * addresses; this would be too easy way to crash kernel. 1880 */ 1881 if (!max_addresses || 1882 ipv6_count_addresses(in6_dev) < max_addresses) 1883 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1884 addr_type&IPV6_ADDR_SCOPE_MASK, 1885 addr_flags); 1886 1887 if (!ifp || IS_ERR(ifp)) { 1888 in6_dev_put(in6_dev); 1889 return; 1890 } 1891 1892 update_lft = create = 1; 1893 ifp->cstamp = jiffies; 1894 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1895 } 1896 1897 if (ifp) { 1898 int flags; 1899 unsigned long now; 1900 #ifdef CONFIG_IPV6_PRIVACY 1901 struct inet6_ifaddr *ift; 1902 #endif 1903 u32 stored_lft; 1904 1905 /* update lifetime (RFC2462 5.5.3 e) */ 1906 spin_lock(&ifp->lock); 1907 now = jiffies; 1908 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1909 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1910 else 1911 stored_lft = 0; 1912 if (!update_lft && stored_lft) { 1913 if (valid_lft > MIN_VALID_LIFETIME || 1914 valid_lft > stored_lft) 1915 update_lft = 1; 1916 else if (stored_lft <= MIN_VALID_LIFETIME) { 1917 /* valid_lft <= stored_lft is always true */ 1918 /* XXX: IPsec */ 1919 update_lft = 0; 1920 } else { 1921 valid_lft = MIN_VALID_LIFETIME; 1922 if (valid_lft < prefered_lft) 1923 prefered_lft = valid_lft; 1924 update_lft = 1; 1925 } 1926 } 1927 1928 if (update_lft) { 1929 ifp->valid_lft = valid_lft; 1930 ifp->prefered_lft = prefered_lft; 1931 ifp->tstamp = now; 1932 flags = ifp->flags; 1933 ifp->flags &= ~IFA_F_DEPRECATED; 1934 spin_unlock(&ifp->lock); 1935 1936 if (!(flags&IFA_F_TENTATIVE)) 1937 ipv6_ifa_notify(0, ifp); 1938 } else 1939 spin_unlock(&ifp->lock); 1940 1941 #ifdef CONFIG_IPV6_PRIVACY 1942 read_lock_bh(&in6_dev->lock); 1943 /* update all temporary addresses in the list */ 1944 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1945 /* 1946 * When adjusting the lifetimes of an existing 1947 * temporary address, only lower the lifetimes. 1948 * Implementations must not increase the 1949 * lifetimes of an existing temporary address 1950 * when processing a Prefix Information Option. 1951 */ 1952 if (ifp != ift->ifpub) 1953 continue; 1954 1955 spin_lock(&ift->lock); 1956 flags = ift->flags; 1957 if (ift->valid_lft > valid_lft && 1958 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1959 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1960 if (ift->prefered_lft > prefered_lft && 1961 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1962 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1963 spin_unlock(&ift->lock); 1964 if (!(flags&IFA_F_TENTATIVE)) 1965 ipv6_ifa_notify(0, ift); 1966 } 1967 1968 if (create && in6_dev->cnf.use_tempaddr > 0) { 1969 /* 1970 * When a new public address is created as described in [ADDRCONF], 1971 * also create a new temporary address. 1972 */ 1973 read_unlock_bh(&in6_dev->lock); 1974 ipv6_create_tempaddr(ifp, NULL); 1975 } else { 1976 read_unlock_bh(&in6_dev->lock); 1977 } 1978 #endif 1979 in6_ifa_put(ifp); 1980 addrconf_verify(0); 1981 } 1982 } 1983 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1984 in6_dev_put(in6_dev); 1985 } 1986 1987 /* 1988 * Set destination address. 1989 * Special case for SIT interfaces where we create a new "virtual" 1990 * device. 1991 */ 1992 int addrconf_set_dstaddr(struct net *net, void __user *arg) 1993 { 1994 struct in6_ifreq ireq; 1995 struct net_device *dev; 1996 int err = -EINVAL; 1997 1998 rtnl_lock(); 1999 2000 err = -EFAULT; 2001 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2002 goto err_exit; 2003 2004 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2005 2006 err = -ENODEV; 2007 if (dev == NULL) 2008 goto err_exit; 2009 2010 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2011 if (dev->type == ARPHRD_SIT) { 2012 const struct net_device_ops *ops = dev->netdev_ops; 2013 struct ifreq ifr; 2014 struct ip_tunnel_parm p; 2015 2016 err = -EADDRNOTAVAIL; 2017 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2018 goto err_exit; 2019 2020 memset(&p, 0, sizeof(p)); 2021 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2022 p.iph.saddr = 0; 2023 p.iph.version = 4; 2024 p.iph.ihl = 5; 2025 p.iph.protocol = IPPROTO_IPV6; 2026 p.iph.ttl = 64; 2027 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2028 2029 if (ops->ndo_do_ioctl) { 2030 mm_segment_t oldfs = get_fs(); 2031 2032 set_fs(KERNEL_DS); 2033 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2034 set_fs(oldfs); 2035 } else 2036 err = -EOPNOTSUPP; 2037 2038 if (err == 0) { 2039 err = -ENOBUFS; 2040 dev = __dev_get_by_name(net, p.name); 2041 if (!dev) 2042 goto err_exit; 2043 err = dev_open(dev); 2044 } 2045 } 2046 #endif 2047 2048 err_exit: 2049 rtnl_unlock(); 2050 return err; 2051 } 2052 2053 /* 2054 * Manual configuration of address on an interface 2055 */ 2056 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2057 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2058 __u32 valid_lft) 2059 { 2060 struct inet6_ifaddr *ifp; 2061 struct inet6_dev *idev; 2062 struct net_device *dev; 2063 int scope; 2064 u32 flags; 2065 clock_t expires; 2066 unsigned long timeout; 2067 2068 ASSERT_RTNL(); 2069 2070 if (plen > 128) 2071 return -EINVAL; 2072 2073 /* check the lifetime */ 2074 if (!valid_lft || prefered_lft > valid_lft) 2075 return -EINVAL; 2076 2077 dev = __dev_get_by_index(net, ifindex); 2078 if (!dev) 2079 return -ENODEV; 2080 2081 if ((idev = addrconf_add_dev(dev)) == NULL) 2082 return -ENOBUFS; 2083 2084 scope = ipv6_addr_scope(pfx); 2085 2086 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2087 if (addrconf_finite_timeout(timeout)) { 2088 expires = jiffies_to_clock_t(timeout * HZ); 2089 valid_lft = timeout; 2090 flags = RTF_EXPIRES; 2091 } else { 2092 expires = 0; 2093 flags = 0; 2094 ifa_flags |= IFA_F_PERMANENT; 2095 } 2096 2097 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2098 if (addrconf_finite_timeout(timeout)) { 2099 if (timeout == 0) 2100 ifa_flags |= IFA_F_DEPRECATED; 2101 prefered_lft = timeout; 2102 } 2103 2104 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2105 2106 if (!IS_ERR(ifp)) { 2107 spin_lock_bh(&ifp->lock); 2108 ifp->valid_lft = valid_lft; 2109 ifp->prefered_lft = prefered_lft; 2110 ifp->tstamp = jiffies; 2111 spin_unlock_bh(&ifp->lock); 2112 2113 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2114 expires, flags); 2115 /* 2116 * Note that section 3.1 of RFC 4429 indicates 2117 * that the Optimistic flag should not be set for 2118 * manually configured addresses 2119 */ 2120 addrconf_dad_start(ifp, 0); 2121 in6_ifa_put(ifp); 2122 addrconf_verify(0); 2123 return 0; 2124 } 2125 2126 return PTR_ERR(ifp); 2127 } 2128 2129 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2130 unsigned int plen) 2131 { 2132 struct inet6_ifaddr *ifp; 2133 struct inet6_dev *idev; 2134 struct net_device *dev; 2135 2136 if (plen > 128) 2137 return -EINVAL; 2138 2139 dev = __dev_get_by_index(net, ifindex); 2140 if (!dev) 2141 return -ENODEV; 2142 2143 if ((idev = __in6_dev_get(dev)) == NULL) 2144 return -ENXIO; 2145 2146 read_lock_bh(&idev->lock); 2147 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2148 if (ifp->prefix_len == plen && 2149 ipv6_addr_equal(pfx, &ifp->addr)) { 2150 in6_ifa_hold(ifp); 2151 read_unlock_bh(&idev->lock); 2152 2153 ipv6_del_addr(ifp); 2154 2155 /* If the last address is deleted administratively, 2156 disable IPv6 on this interface. 2157 */ 2158 if (idev->addr_list == NULL) 2159 addrconf_ifdown(idev->dev, 1); 2160 return 0; 2161 } 2162 } 2163 read_unlock_bh(&idev->lock); 2164 return -EADDRNOTAVAIL; 2165 } 2166 2167 2168 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2169 { 2170 struct in6_ifreq ireq; 2171 int err; 2172 2173 if (!capable(CAP_NET_ADMIN)) 2174 return -EPERM; 2175 2176 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2177 return -EFAULT; 2178 2179 rtnl_lock(); 2180 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2181 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2182 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2183 rtnl_unlock(); 2184 return err; 2185 } 2186 2187 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2188 { 2189 struct in6_ifreq ireq; 2190 int err; 2191 2192 if (!capable(CAP_NET_ADMIN)) 2193 return -EPERM; 2194 2195 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2196 return -EFAULT; 2197 2198 rtnl_lock(); 2199 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2200 ireq.ifr6_prefixlen); 2201 rtnl_unlock(); 2202 return err; 2203 } 2204 2205 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2206 int plen, int scope) 2207 { 2208 struct inet6_ifaddr *ifp; 2209 2210 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2211 if (!IS_ERR(ifp)) { 2212 spin_lock_bh(&ifp->lock); 2213 ifp->flags &= ~IFA_F_TENTATIVE; 2214 spin_unlock_bh(&ifp->lock); 2215 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2216 in6_ifa_put(ifp); 2217 } 2218 } 2219 2220 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2221 static void sit_add_v4_addrs(struct inet6_dev *idev) 2222 { 2223 struct in6_addr addr; 2224 struct net_device *dev; 2225 struct net *net = dev_net(idev->dev); 2226 int scope; 2227 2228 ASSERT_RTNL(); 2229 2230 memset(&addr, 0, sizeof(struct in6_addr)); 2231 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2232 2233 if (idev->dev->flags&IFF_POINTOPOINT) { 2234 addr.s6_addr32[0] = htonl(0xfe800000); 2235 scope = IFA_LINK; 2236 } else { 2237 scope = IPV6_ADDR_COMPATv4; 2238 } 2239 2240 if (addr.s6_addr32[3]) { 2241 add_addr(idev, &addr, 128, scope); 2242 return; 2243 } 2244 2245 for_each_netdev(net, dev) { 2246 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2247 if (in_dev && (dev->flags & IFF_UP)) { 2248 struct in_ifaddr * ifa; 2249 2250 int flag = scope; 2251 2252 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2253 int plen; 2254 2255 addr.s6_addr32[3] = ifa->ifa_local; 2256 2257 if (ifa->ifa_scope == RT_SCOPE_LINK) 2258 continue; 2259 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2260 if (idev->dev->flags&IFF_POINTOPOINT) 2261 continue; 2262 flag |= IFA_HOST; 2263 } 2264 if (idev->dev->flags&IFF_POINTOPOINT) 2265 plen = 64; 2266 else 2267 plen = 96; 2268 2269 add_addr(idev, &addr, plen, flag); 2270 } 2271 } 2272 } 2273 } 2274 #endif 2275 2276 static void init_loopback(struct net_device *dev) 2277 { 2278 struct inet6_dev *idev; 2279 2280 /* ::1 */ 2281 2282 ASSERT_RTNL(); 2283 2284 if ((idev = ipv6_find_idev(dev)) == NULL) { 2285 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2286 return; 2287 } 2288 2289 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2290 } 2291 2292 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2293 { 2294 struct inet6_ifaddr * ifp; 2295 u32 addr_flags = IFA_F_PERMANENT; 2296 2297 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2298 if (idev->cnf.optimistic_dad && 2299 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2300 addr_flags |= IFA_F_OPTIMISTIC; 2301 #endif 2302 2303 2304 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2305 if (!IS_ERR(ifp)) { 2306 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2307 addrconf_dad_start(ifp, 0); 2308 in6_ifa_put(ifp); 2309 } 2310 } 2311 2312 static void addrconf_dev_config(struct net_device *dev) 2313 { 2314 struct in6_addr addr; 2315 struct inet6_dev * idev; 2316 2317 ASSERT_RTNL(); 2318 2319 if ((dev->type != ARPHRD_ETHER) && 2320 (dev->type != ARPHRD_FDDI) && 2321 (dev->type != ARPHRD_IEEE802_TR) && 2322 (dev->type != ARPHRD_ARCNET) && 2323 (dev->type != ARPHRD_INFINIBAND)) { 2324 /* Alas, we support only Ethernet autoconfiguration. */ 2325 return; 2326 } 2327 2328 idev = addrconf_add_dev(dev); 2329 if (idev == NULL) 2330 return; 2331 2332 memset(&addr, 0, sizeof(struct in6_addr)); 2333 addr.s6_addr32[0] = htonl(0xFE800000); 2334 2335 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2336 addrconf_add_linklocal(idev, &addr); 2337 } 2338 2339 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2340 static void addrconf_sit_config(struct net_device *dev) 2341 { 2342 struct inet6_dev *idev; 2343 2344 ASSERT_RTNL(); 2345 2346 /* 2347 * Configure the tunnel with one of our IPv4 2348 * addresses... we should configure all of 2349 * our v4 addrs in the tunnel 2350 */ 2351 2352 if ((idev = ipv6_find_idev(dev)) == NULL) { 2353 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2354 return; 2355 } 2356 2357 if (dev->priv_flags & IFF_ISATAP) { 2358 struct in6_addr addr; 2359 2360 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2361 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2362 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2363 addrconf_add_linklocal(idev, &addr); 2364 return; 2365 } 2366 2367 sit_add_v4_addrs(idev); 2368 2369 if (dev->flags&IFF_POINTOPOINT) { 2370 addrconf_add_mroute(dev); 2371 addrconf_add_lroute(dev); 2372 } else 2373 sit_route_add(dev); 2374 } 2375 #endif 2376 2377 static inline int 2378 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2379 { 2380 struct in6_addr lladdr; 2381 2382 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2383 addrconf_add_linklocal(idev, &lladdr); 2384 return 0; 2385 } 2386 return -1; 2387 } 2388 2389 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2390 { 2391 struct net_device *link_dev; 2392 struct net *net = dev_net(idev->dev); 2393 2394 /* first try to inherit the link-local address from the link device */ 2395 if (idev->dev->iflink && 2396 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2397 if (!ipv6_inherit_linklocal(idev, link_dev)) 2398 return; 2399 } 2400 /* then try to inherit it from any device */ 2401 for_each_netdev(net, link_dev) { 2402 if (!ipv6_inherit_linklocal(idev, link_dev)) 2403 return; 2404 } 2405 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2406 } 2407 2408 /* 2409 * Autoconfigure tunnel with a link-local address so routing protocols, 2410 * DHCPv6, MLD etc. can be run over the virtual link 2411 */ 2412 2413 static void addrconf_ip6_tnl_config(struct net_device *dev) 2414 { 2415 struct inet6_dev *idev; 2416 2417 ASSERT_RTNL(); 2418 2419 if ((idev = addrconf_add_dev(dev)) == NULL) { 2420 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2421 return; 2422 } 2423 ip6_tnl_add_linklocal(idev); 2424 } 2425 2426 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2427 void * data) 2428 { 2429 struct net_device *dev = (struct net_device *) data; 2430 struct inet6_dev *idev = __in6_dev_get(dev); 2431 int run_pending = 0; 2432 int err; 2433 2434 switch(event) { 2435 case NETDEV_REGISTER: 2436 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2437 idev = ipv6_add_dev(dev); 2438 if (!idev) 2439 return notifier_from_errno(-ENOMEM); 2440 } 2441 break; 2442 case NETDEV_UP: 2443 case NETDEV_CHANGE: 2444 if (dev->flags & IFF_SLAVE) 2445 break; 2446 2447 if (event == NETDEV_UP) { 2448 if (!addrconf_qdisc_ok(dev)) { 2449 /* device is not ready yet. */ 2450 printk(KERN_INFO 2451 "ADDRCONF(NETDEV_UP): %s: " 2452 "link is not ready\n", 2453 dev->name); 2454 break; 2455 } 2456 2457 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2458 idev = ipv6_add_dev(dev); 2459 2460 if (idev) { 2461 idev->if_flags |= IF_READY; 2462 run_pending = 1; 2463 } 2464 } else { 2465 if (!addrconf_qdisc_ok(dev)) { 2466 /* device is still not ready. */ 2467 break; 2468 } 2469 2470 if (idev) { 2471 if (idev->if_flags & IF_READY) { 2472 /* device is already configured. */ 2473 break; 2474 } 2475 idev->if_flags |= IF_READY; 2476 } 2477 2478 printk(KERN_INFO 2479 "ADDRCONF(NETDEV_CHANGE): %s: " 2480 "link becomes ready\n", 2481 dev->name); 2482 2483 run_pending = 1; 2484 } 2485 2486 switch(dev->type) { 2487 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2488 case ARPHRD_SIT: 2489 addrconf_sit_config(dev); 2490 break; 2491 #endif 2492 case ARPHRD_TUNNEL6: 2493 addrconf_ip6_tnl_config(dev); 2494 break; 2495 case ARPHRD_LOOPBACK: 2496 init_loopback(dev); 2497 break; 2498 2499 default: 2500 addrconf_dev_config(dev); 2501 break; 2502 } 2503 if (idev) { 2504 if (run_pending) 2505 addrconf_dad_run(idev); 2506 2507 /* If the MTU changed during the interface down, when the 2508 interface up, the changed MTU must be reflected in the 2509 idev as well as routers. 2510 */ 2511 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2512 rt6_mtu_change(dev, dev->mtu); 2513 idev->cnf.mtu6 = dev->mtu; 2514 } 2515 idev->tstamp = jiffies; 2516 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2517 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2518 stop IPv6 on this interface. 2519 */ 2520 if (dev->mtu < IPV6_MIN_MTU) 2521 addrconf_ifdown(dev, event != NETDEV_DOWN); 2522 } 2523 break; 2524 2525 case NETDEV_CHANGEMTU: 2526 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2527 rt6_mtu_change(dev, dev->mtu); 2528 idev->cnf.mtu6 = dev->mtu; 2529 break; 2530 } 2531 2532 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2533 idev = ipv6_add_dev(dev); 2534 if (idev) 2535 break; 2536 } 2537 2538 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2539 2540 case NETDEV_DOWN: 2541 case NETDEV_UNREGISTER: 2542 /* 2543 * Remove all addresses from this interface. 2544 */ 2545 addrconf_ifdown(dev, event != NETDEV_DOWN); 2546 break; 2547 2548 case NETDEV_CHANGENAME: 2549 if (idev) { 2550 snmp6_unregister_dev(idev); 2551 addrconf_sysctl_unregister(idev); 2552 addrconf_sysctl_register(idev); 2553 err = snmp6_register_dev(idev); 2554 if (err) 2555 return notifier_from_errno(err); 2556 } 2557 break; 2558 } 2559 2560 return NOTIFY_OK; 2561 } 2562 2563 /* 2564 * addrconf module should be notified of a device going up 2565 */ 2566 static struct notifier_block ipv6_dev_notf = { 2567 .notifier_call = addrconf_notify, 2568 .priority = 0 2569 }; 2570 2571 static int addrconf_ifdown(struct net_device *dev, int how) 2572 { 2573 struct inet6_dev *idev; 2574 struct inet6_ifaddr *ifa, **bifa; 2575 struct net *net = dev_net(dev); 2576 int i; 2577 2578 ASSERT_RTNL(); 2579 2580 rt6_ifdown(net, dev); 2581 neigh_ifdown(&nd_tbl, dev); 2582 2583 idev = __in6_dev_get(dev); 2584 if (idev == NULL) 2585 return -ENODEV; 2586 2587 /* Step 1: remove reference to ipv6 device from parent device. 2588 Do not dev_put! 2589 */ 2590 if (how) { 2591 idev->dead = 1; 2592 2593 /* protected by rtnl_lock */ 2594 rcu_assign_pointer(dev->ip6_ptr, NULL); 2595 2596 /* Step 1.5: remove snmp6 entry */ 2597 snmp6_unregister_dev(idev); 2598 2599 } 2600 2601 /* Step 2: clear hash table */ 2602 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2603 bifa = &inet6_addr_lst[i]; 2604 2605 write_lock_bh(&addrconf_hash_lock); 2606 while ((ifa = *bifa) != NULL) { 2607 if (ifa->idev == idev) { 2608 *bifa = ifa->lst_next; 2609 ifa->lst_next = NULL; 2610 addrconf_del_timer(ifa); 2611 in6_ifa_put(ifa); 2612 continue; 2613 } 2614 bifa = &ifa->lst_next; 2615 } 2616 write_unlock_bh(&addrconf_hash_lock); 2617 } 2618 2619 write_lock_bh(&idev->lock); 2620 2621 /* Step 3: clear flags for stateless addrconf */ 2622 if (!how) 2623 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2624 2625 /* Step 4: clear address list */ 2626 #ifdef CONFIG_IPV6_PRIVACY 2627 if (how && del_timer(&idev->regen_timer)) 2628 in6_dev_put(idev); 2629 2630 /* clear tempaddr list */ 2631 while ((ifa = idev->tempaddr_list) != NULL) { 2632 idev->tempaddr_list = ifa->tmp_next; 2633 ifa->tmp_next = NULL; 2634 ifa->dead = 1; 2635 write_unlock_bh(&idev->lock); 2636 spin_lock_bh(&ifa->lock); 2637 2638 if (ifa->ifpub) { 2639 in6_ifa_put(ifa->ifpub); 2640 ifa->ifpub = NULL; 2641 } 2642 spin_unlock_bh(&ifa->lock); 2643 in6_ifa_put(ifa); 2644 write_lock_bh(&idev->lock); 2645 } 2646 #endif 2647 while ((ifa = idev->addr_list) != NULL) { 2648 idev->addr_list = ifa->if_next; 2649 ifa->if_next = NULL; 2650 ifa->dead = 1; 2651 addrconf_del_timer(ifa); 2652 write_unlock_bh(&idev->lock); 2653 2654 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2655 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2656 in6_ifa_put(ifa); 2657 2658 write_lock_bh(&idev->lock); 2659 } 2660 write_unlock_bh(&idev->lock); 2661 2662 /* Step 5: Discard multicast list */ 2663 2664 if (how) 2665 ipv6_mc_destroy_dev(idev); 2666 else 2667 ipv6_mc_down(idev); 2668 2669 idev->tstamp = jiffies; 2670 2671 /* Shot the device (if unregistered) */ 2672 2673 if (how) { 2674 addrconf_sysctl_unregister(idev); 2675 neigh_parms_release(&nd_tbl, idev->nd_parms); 2676 neigh_ifdown(&nd_tbl, dev); 2677 in6_dev_put(idev); 2678 } 2679 return 0; 2680 } 2681 2682 static void addrconf_rs_timer(unsigned long data) 2683 { 2684 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2685 2686 if (ifp->idev->cnf.forwarding) 2687 goto out; 2688 2689 if (ifp->idev->if_flags & IF_RA_RCVD) { 2690 /* 2691 * Announcement received after solicitation 2692 * was sent 2693 */ 2694 goto out; 2695 } 2696 2697 spin_lock(&ifp->lock); 2698 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2699 /* The wait after the last probe can be shorter */ 2700 addrconf_mod_timer(ifp, AC_RS, 2701 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2702 ifp->idev->cnf.rtr_solicit_delay : 2703 ifp->idev->cnf.rtr_solicit_interval); 2704 spin_unlock(&ifp->lock); 2705 2706 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2707 } else { 2708 spin_unlock(&ifp->lock); 2709 /* 2710 * Note: we do not support deprecated "all on-link" 2711 * assumption any longer. 2712 */ 2713 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2714 ifp->idev->dev->name); 2715 } 2716 2717 out: 2718 in6_ifa_put(ifp); 2719 } 2720 2721 /* 2722 * Duplicate Address Detection 2723 */ 2724 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2725 { 2726 unsigned long rand_num; 2727 struct inet6_dev *idev = ifp->idev; 2728 2729 if (ifp->flags & IFA_F_OPTIMISTIC) 2730 rand_num = 0; 2731 else 2732 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2733 2734 ifp->probes = idev->cnf.dad_transmits; 2735 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2736 } 2737 2738 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2739 { 2740 struct inet6_dev *idev = ifp->idev; 2741 struct net_device *dev = idev->dev; 2742 2743 addrconf_join_solict(dev, &ifp->addr); 2744 2745 net_srandom(ifp->addr.s6_addr32[3]); 2746 2747 read_lock_bh(&idev->lock); 2748 if (ifp->dead) 2749 goto out; 2750 spin_lock_bh(&ifp->lock); 2751 2752 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2753 idev->cnf.accept_dad < 1 || 2754 !(ifp->flags&IFA_F_TENTATIVE) || 2755 ifp->flags & IFA_F_NODAD) { 2756 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2757 spin_unlock_bh(&ifp->lock); 2758 read_unlock_bh(&idev->lock); 2759 2760 addrconf_dad_completed(ifp); 2761 return; 2762 } 2763 2764 if (!(idev->if_flags & IF_READY)) { 2765 spin_unlock_bh(&ifp->lock); 2766 read_unlock_bh(&idev->lock); 2767 /* 2768 * If the defice is not ready: 2769 * - keep it tentative if it is a permanent address. 2770 * - otherwise, kill it. 2771 */ 2772 in6_ifa_hold(ifp); 2773 addrconf_dad_stop(ifp); 2774 return; 2775 } 2776 2777 /* 2778 * Optimistic nodes can start receiving 2779 * Frames right away 2780 */ 2781 if(ifp->flags & IFA_F_OPTIMISTIC) 2782 ip6_ins_rt(ifp->rt); 2783 2784 addrconf_dad_kick(ifp); 2785 spin_unlock_bh(&ifp->lock); 2786 out: 2787 read_unlock_bh(&idev->lock); 2788 } 2789 2790 static void addrconf_dad_timer(unsigned long data) 2791 { 2792 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2793 struct inet6_dev *idev = ifp->idev; 2794 struct in6_addr mcaddr; 2795 2796 read_lock_bh(&idev->lock); 2797 if (idev->dead) { 2798 read_unlock_bh(&idev->lock); 2799 goto out; 2800 } 2801 spin_lock_bh(&ifp->lock); 2802 if (ifp->probes == 0) { 2803 /* 2804 * DAD was successful 2805 */ 2806 2807 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2808 spin_unlock_bh(&ifp->lock); 2809 read_unlock_bh(&idev->lock); 2810 2811 addrconf_dad_completed(ifp); 2812 2813 goto out; 2814 } 2815 2816 ifp->probes--; 2817 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2818 spin_unlock_bh(&ifp->lock); 2819 read_unlock_bh(&idev->lock); 2820 2821 /* send a neighbour solicitation for our addr */ 2822 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2823 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2824 out: 2825 in6_ifa_put(ifp); 2826 } 2827 2828 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2829 { 2830 struct net_device * dev = ifp->idev->dev; 2831 2832 /* 2833 * Configure the address for reception. Now it is valid. 2834 */ 2835 2836 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2837 2838 /* If added prefix is link local and forwarding is off, 2839 start sending router solicitations. 2840 */ 2841 2842 if (ifp->idev->cnf.forwarding == 0 && 2843 ifp->idev->cnf.rtr_solicits > 0 && 2844 (dev->flags&IFF_LOOPBACK) == 0 && 2845 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2846 /* 2847 * If a host as already performed a random delay 2848 * [...] as part of DAD [...] there is no need 2849 * to delay again before sending the first RS 2850 */ 2851 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2852 2853 spin_lock_bh(&ifp->lock); 2854 ifp->probes = 1; 2855 ifp->idev->if_flags |= IF_RS_SENT; 2856 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2857 spin_unlock_bh(&ifp->lock); 2858 } 2859 } 2860 2861 static void addrconf_dad_run(struct inet6_dev *idev) { 2862 struct inet6_ifaddr *ifp; 2863 2864 read_lock_bh(&idev->lock); 2865 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2866 spin_lock_bh(&ifp->lock); 2867 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2868 spin_unlock_bh(&ifp->lock); 2869 continue; 2870 } 2871 spin_unlock_bh(&ifp->lock); 2872 addrconf_dad_kick(ifp); 2873 } 2874 read_unlock_bh(&idev->lock); 2875 } 2876 2877 #ifdef CONFIG_PROC_FS 2878 struct if6_iter_state { 2879 struct seq_net_private p; 2880 int bucket; 2881 }; 2882 2883 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2884 { 2885 struct inet6_ifaddr *ifa = NULL; 2886 struct if6_iter_state *state = seq->private; 2887 struct net *net = seq_file_net(seq); 2888 2889 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2890 ifa = inet6_addr_lst[state->bucket]; 2891 2892 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2893 ifa = ifa->lst_next; 2894 if (ifa) 2895 break; 2896 } 2897 return ifa; 2898 } 2899 2900 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2901 { 2902 struct if6_iter_state *state = seq->private; 2903 struct net *net = seq_file_net(seq); 2904 2905 ifa = ifa->lst_next; 2906 try_again: 2907 if (ifa) { 2908 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2909 ifa = ifa->lst_next; 2910 goto try_again; 2911 } 2912 } 2913 2914 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2915 ifa = inet6_addr_lst[state->bucket]; 2916 goto try_again; 2917 } 2918 2919 return ifa; 2920 } 2921 2922 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2923 { 2924 struct inet6_ifaddr *ifa = if6_get_first(seq); 2925 2926 if (ifa) 2927 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2928 --pos; 2929 return pos ? NULL : ifa; 2930 } 2931 2932 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2933 __acquires(addrconf_hash_lock) 2934 { 2935 read_lock_bh(&addrconf_hash_lock); 2936 return if6_get_idx(seq, *pos); 2937 } 2938 2939 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2940 { 2941 struct inet6_ifaddr *ifa; 2942 2943 ifa = if6_get_next(seq, v); 2944 ++*pos; 2945 return ifa; 2946 } 2947 2948 static void if6_seq_stop(struct seq_file *seq, void *v) 2949 __releases(addrconf_hash_lock) 2950 { 2951 read_unlock_bh(&addrconf_hash_lock); 2952 } 2953 2954 static int if6_seq_show(struct seq_file *seq, void *v) 2955 { 2956 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2957 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 2958 &ifp->addr, 2959 ifp->idev->dev->ifindex, 2960 ifp->prefix_len, 2961 ifp->scope, 2962 ifp->flags, 2963 ifp->idev->dev->name); 2964 return 0; 2965 } 2966 2967 static const struct seq_operations if6_seq_ops = { 2968 .start = if6_seq_start, 2969 .next = if6_seq_next, 2970 .show = if6_seq_show, 2971 .stop = if6_seq_stop, 2972 }; 2973 2974 static int if6_seq_open(struct inode *inode, struct file *file) 2975 { 2976 return seq_open_net(inode, file, &if6_seq_ops, 2977 sizeof(struct if6_iter_state)); 2978 } 2979 2980 static const struct file_operations if6_fops = { 2981 .owner = THIS_MODULE, 2982 .open = if6_seq_open, 2983 .read = seq_read, 2984 .llseek = seq_lseek, 2985 .release = seq_release_net, 2986 }; 2987 2988 static int if6_proc_net_init(struct net *net) 2989 { 2990 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 2991 return -ENOMEM; 2992 return 0; 2993 } 2994 2995 static void if6_proc_net_exit(struct net *net) 2996 { 2997 proc_net_remove(net, "if_inet6"); 2998 } 2999 3000 static struct pernet_operations if6_proc_net_ops = { 3001 .init = if6_proc_net_init, 3002 .exit = if6_proc_net_exit, 3003 }; 3004 3005 int __init if6_proc_init(void) 3006 { 3007 return register_pernet_subsys(&if6_proc_net_ops); 3008 } 3009 3010 void if6_proc_exit(void) 3011 { 3012 unregister_pernet_subsys(&if6_proc_net_ops); 3013 } 3014 #endif /* CONFIG_PROC_FS */ 3015 3016 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3017 /* Check if address is a home address configured on any interface. */ 3018 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3019 { 3020 int ret = 0; 3021 struct inet6_ifaddr * ifp; 3022 u8 hash = ipv6_addr_hash(addr); 3023 read_lock_bh(&addrconf_hash_lock); 3024 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 3025 if (!net_eq(dev_net(ifp->idev->dev), net)) 3026 continue; 3027 if (ipv6_addr_equal(&ifp->addr, addr) && 3028 (ifp->flags & IFA_F_HOMEADDRESS)) { 3029 ret = 1; 3030 break; 3031 } 3032 } 3033 read_unlock_bh(&addrconf_hash_lock); 3034 return ret; 3035 } 3036 #endif 3037 3038 /* 3039 * Periodic address status verification 3040 */ 3041 3042 static void addrconf_verify(unsigned long foo) 3043 { 3044 struct inet6_ifaddr *ifp; 3045 unsigned long now, next; 3046 int i; 3047 3048 spin_lock_bh(&addrconf_verify_lock); 3049 now = jiffies; 3050 next = now + ADDR_CHECK_FREQUENCY; 3051 3052 del_timer(&addr_chk_timer); 3053 3054 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3055 3056 restart: 3057 read_lock(&addrconf_hash_lock); 3058 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3059 unsigned long age; 3060 #ifdef CONFIG_IPV6_PRIVACY 3061 unsigned long regen_advance; 3062 #endif 3063 3064 if (ifp->flags & IFA_F_PERMANENT) 3065 continue; 3066 3067 spin_lock(&ifp->lock); 3068 age = (now - ifp->tstamp) / HZ; 3069 3070 #ifdef CONFIG_IPV6_PRIVACY 3071 regen_advance = ifp->idev->cnf.regen_max_retry * 3072 ifp->idev->cnf.dad_transmits * 3073 ifp->idev->nd_parms->retrans_time / HZ; 3074 #endif 3075 3076 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3077 age >= ifp->valid_lft) { 3078 spin_unlock(&ifp->lock); 3079 in6_ifa_hold(ifp); 3080 read_unlock(&addrconf_hash_lock); 3081 ipv6_del_addr(ifp); 3082 goto restart; 3083 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3084 spin_unlock(&ifp->lock); 3085 continue; 3086 } else if (age >= ifp->prefered_lft) { 3087 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 3088 int deprecate = 0; 3089 3090 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3091 deprecate = 1; 3092 ifp->flags |= IFA_F_DEPRECATED; 3093 } 3094 3095 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3096 next = ifp->tstamp + ifp->valid_lft * HZ; 3097 3098 spin_unlock(&ifp->lock); 3099 3100 if (deprecate) { 3101 in6_ifa_hold(ifp); 3102 read_unlock(&addrconf_hash_lock); 3103 3104 ipv6_ifa_notify(0, ifp); 3105 in6_ifa_put(ifp); 3106 goto restart; 3107 } 3108 #ifdef CONFIG_IPV6_PRIVACY 3109 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3110 !(ifp->flags&IFA_F_TENTATIVE)) { 3111 if (age >= ifp->prefered_lft - regen_advance) { 3112 struct inet6_ifaddr *ifpub = ifp->ifpub; 3113 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3114 next = ifp->tstamp + ifp->prefered_lft * HZ; 3115 if (!ifp->regen_count && ifpub) { 3116 ifp->regen_count++; 3117 in6_ifa_hold(ifp); 3118 in6_ifa_hold(ifpub); 3119 spin_unlock(&ifp->lock); 3120 read_unlock(&addrconf_hash_lock); 3121 spin_lock(&ifpub->lock); 3122 ifpub->regen_count = 0; 3123 spin_unlock(&ifpub->lock); 3124 ipv6_create_tempaddr(ifpub, ifp); 3125 in6_ifa_put(ifpub); 3126 in6_ifa_put(ifp); 3127 goto restart; 3128 } 3129 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3130 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3131 spin_unlock(&ifp->lock); 3132 #endif 3133 } else { 3134 /* ifp->prefered_lft <= ifp->valid_lft */ 3135 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3136 next = ifp->tstamp + ifp->prefered_lft * HZ; 3137 spin_unlock(&ifp->lock); 3138 } 3139 } 3140 read_unlock(&addrconf_hash_lock); 3141 } 3142 3143 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3144 add_timer(&addr_chk_timer); 3145 spin_unlock_bh(&addrconf_verify_lock); 3146 } 3147 3148 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3149 { 3150 struct in6_addr *pfx = NULL; 3151 3152 if (addr) 3153 pfx = nla_data(addr); 3154 3155 if (local) { 3156 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3157 pfx = NULL; 3158 else 3159 pfx = nla_data(local); 3160 } 3161 3162 return pfx; 3163 } 3164 3165 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3166 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3167 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3168 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3169 }; 3170 3171 static int 3172 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3173 { 3174 struct net *net = sock_net(skb->sk); 3175 struct ifaddrmsg *ifm; 3176 struct nlattr *tb[IFA_MAX+1]; 3177 struct in6_addr *pfx; 3178 int err; 3179 3180 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3181 if (err < 0) 3182 return err; 3183 3184 ifm = nlmsg_data(nlh); 3185 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3186 if (pfx == NULL) 3187 return -EINVAL; 3188 3189 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3190 } 3191 3192 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3193 u32 prefered_lft, u32 valid_lft) 3194 { 3195 u32 flags; 3196 clock_t expires; 3197 unsigned long timeout; 3198 3199 if (!valid_lft || (prefered_lft > valid_lft)) 3200 return -EINVAL; 3201 3202 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3203 if (addrconf_finite_timeout(timeout)) { 3204 expires = jiffies_to_clock_t(timeout * HZ); 3205 valid_lft = timeout; 3206 flags = RTF_EXPIRES; 3207 } else { 3208 expires = 0; 3209 flags = 0; 3210 ifa_flags |= IFA_F_PERMANENT; 3211 } 3212 3213 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3214 if (addrconf_finite_timeout(timeout)) { 3215 if (timeout == 0) 3216 ifa_flags |= IFA_F_DEPRECATED; 3217 prefered_lft = timeout; 3218 } 3219 3220 spin_lock_bh(&ifp->lock); 3221 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3222 ifp->tstamp = jiffies; 3223 ifp->valid_lft = valid_lft; 3224 ifp->prefered_lft = prefered_lft; 3225 3226 spin_unlock_bh(&ifp->lock); 3227 if (!(ifp->flags&IFA_F_TENTATIVE)) 3228 ipv6_ifa_notify(0, ifp); 3229 3230 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3231 expires, flags); 3232 addrconf_verify(0); 3233 3234 return 0; 3235 } 3236 3237 static int 3238 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3239 { 3240 struct net *net = sock_net(skb->sk); 3241 struct ifaddrmsg *ifm; 3242 struct nlattr *tb[IFA_MAX+1]; 3243 struct in6_addr *pfx; 3244 struct inet6_ifaddr *ifa; 3245 struct net_device *dev; 3246 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3247 u8 ifa_flags; 3248 int err; 3249 3250 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3251 if (err < 0) 3252 return err; 3253 3254 ifm = nlmsg_data(nlh); 3255 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3256 if (pfx == NULL) 3257 return -EINVAL; 3258 3259 if (tb[IFA_CACHEINFO]) { 3260 struct ifa_cacheinfo *ci; 3261 3262 ci = nla_data(tb[IFA_CACHEINFO]); 3263 valid_lft = ci->ifa_valid; 3264 preferred_lft = ci->ifa_prefered; 3265 } else { 3266 preferred_lft = INFINITY_LIFE_TIME; 3267 valid_lft = INFINITY_LIFE_TIME; 3268 } 3269 3270 dev = __dev_get_by_index(net, ifm->ifa_index); 3271 if (dev == NULL) 3272 return -ENODEV; 3273 3274 /* We ignore other flags so far. */ 3275 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3276 3277 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3278 if (ifa == NULL) { 3279 /* 3280 * It would be best to check for !NLM_F_CREATE here but 3281 * userspace alreay relies on not having to provide this. 3282 */ 3283 return inet6_addr_add(net, ifm->ifa_index, pfx, 3284 ifm->ifa_prefixlen, ifa_flags, 3285 preferred_lft, valid_lft); 3286 } 3287 3288 if (nlh->nlmsg_flags & NLM_F_EXCL || 3289 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3290 err = -EEXIST; 3291 else 3292 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3293 3294 in6_ifa_put(ifa); 3295 3296 return err; 3297 } 3298 3299 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3300 u8 scope, int ifindex) 3301 { 3302 struct ifaddrmsg *ifm; 3303 3304 ifm = nlmsg_data(nlh); 3305 ifm->ifa_family = AF_INET6; 3306 ifm->ifa_prefixlen = prefixlen; 3307 ifm->ifa_flags = flags; 3308 ifm->ifa_scope = scope; 3309 ifm->ifa_index = ifindex; 3310 } 3311 3312 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3313 unsigned long tstamp, u32 preferred, u32 valid) 3314 { 3315 struct ifa_cacheinfo ci; 3316 3317 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3318 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3319 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3320 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3321 ci.ifa_prefered = preferred; 3322 ci.ifa_valid = valid; 3323 3324 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3325 } 3326 3327 static inline int rt_scope(int ifa_scope) 3328 { 3329 if (ifa_scope & IFA_HOST) 3330 return RT_SCOPE_HOST; 3331 else if (ifa_scope & IFA_LINK) 3332 return RT_SCOPE_LINK; 3333 else if (ifa_scope & IFA_SITE) 3334 return RT_SCOPE_SITE; 3335 else 3336 return RT_SCOPE_UNIVERSE; 3337 } 3338 3339 static inline int inet6_ifaddr_msgsize(void) 3340 { 3341 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3342 + nla_total_size(16) /* IFA_ADDRESS */ 3343 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3344 } 3345 3346 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3347 u32 pid, u32 seq, int event, unsigned int flags) 3348 { 3349 struct nlmsghdr *nlh; 3350 u32 preferred, valid; 3351 3352 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3353 if (nlh == NULL) 3354 return -EMSGSIZE; 3355 3356 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3357 ifa->idev->dev->ifindex); 3358 3359 if (!(ifa->flags&IFA_F_PERMANENT)) { 3360 preferred = ifa->prefered_lft; 3361 valid = ifa->valid_lft; 3362 if (preferred != INFINITY_LIFE_TIME) { 3363 long tval = (jiffies - ifa->tstamp)/HZ; 3364 preferred -= tval; 3365 if (valid != INFINITY_LIFE_TIME) 3366 valid -= tval; 3367 } 3368 } else { 3369 preferred = INFINITY_LIFE_TIME; 3370 valid = INFINITY_LIFE_TIME; 3371 } 3372 3373 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3374 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3375 nlmsg_cancel(skb, nlh); 3376 return -EMSGSIZE; 3377 } 3378 3379 return nlmsg_end(skb, nlh); 3380 } 3381 3382 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3383 u32 pid, u32 seq, int event, u16 flags) 3384 { 3385 struct nlmsghdr *nlh; 3386 u8 scope = RT_SCOPE_UNIVERSE; 3387 int ifindex = ifmca->idev->dev->ifindex; 3388 3389 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3390 scope = RT_SCOPE_SITE; 3391 3392 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3393 if (nlh == NULL) 3394 return -EMSGSIZE; 3395 3396 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3397 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3398 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3399 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3400 nlmsg_cancel(skb, nlh); 3401 return -EMSGSIZE; 3402 } 3403 3404 return nlmsg_end(skb, nlh); 3405 } 3406 3407 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3408 u32 pid, u32 seq, int event, unsigned int flags) 3409 { 3410 struct nlmsghdr *nlh; 3411 u8 scope = RT_SCOPE_UNIVERSE; 3412 int ifindex = ifaca->aca_idev->dev->ifindex; 3413 3414 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3415 scope = RT_SCOPE_SITE; 3416 3417 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3418 if (nlh == NULL) 3419 return -EMSGSIZE; 3420 3421 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3422 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3423 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3424 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3425 nlmsg_cancel(skb, nlh); 3426 return -EMSGSIZE; 3427 } 3428 3429 return nlmsg_end(skb, nlh); 3430 } 3431 3432 enum addr_type_t 3433 { 3434 UNICAST_ADDR, 3435 MULTICAST_ADDR, 3436 ANYCAST_ADDR, 3437 }; 3438 3439 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3440 enum addr_type_t type) 3441 { 3442 int idx, ip_idx; 3443 int s_idx, s_ip_idx; 3444 int err = 1; 3445 struct net_device *dev; 3446 struct inet6_dev *idev = NULL; 3447 struct inet6_ifaddr *ifa; 3448 struct ifmcaddr6 *ifmca; 3449 struct ifacaddr6 *ifaca; 3450 struct net *net = sock_net(skb->sk); 3451 3452 s_idx = cb->args[0]; 3453 s_ip_idx = ip_idx = cb->args[1]; 3454 3455 idx = 0; 3456 for_each_netdev(net, dev) { 3457 if (idx < s_idx) 3458 goto cont; 3459 if (idx > s_idx) 3460 s_ip_idx = 0; 3461 ip_idx = 0; 3462 if ((idev = in6_dev_get(dev)) == NULL) 3463 goto cont; 3464 read_lock_bh(&idev->lock); 3465 switch (type) { 3466 case UNICAST_ADDR: 3467 /* unicast address incl. temp addr */ 3468 for (ifa = idev->addr_list; ifa; 3469 ifa = ifa->if_next, ip_idx++) { 3470 if (ip_idx < s_ip_idx) 3471 continue; 3472 err = inet6_fill_ifaddr(skb, ifa, 3473 NETLINK_CB(cb->skb).pid, 3474 cb->nlh->nlmsg_seq, 3475 RTM_NEWADDR, 3476 NLM_F_MULTI); 3477 } 3478 break; 3479 case MULTICAST_ADDR: 3480 /* multicast address */ 3481 for (ifmca = idev->mc_list; ifmca; 3482 ifmca = ifmca->next, ip_idx++) { 3483 if (ip_idx < s_ip_idx) 3484 continue; 3485 err = inet6_fill_ifmcaddr(skb, ifmca, 3486 NETLINK_CB(cb->skb).pid, 3487 cb->nlh->nlmsg_seq, 3488 RTM_GETMULTICAST, 3489 NLM_F_MULTI); 3490 } 3491 break; 3492 case ANYCAST_ADDR: 3493 /* anycast address */ 3494 for (ifaca = idev->ac_list; ifaca; 3495 ifaca = ifaca->aca_next, ip_idx++) { 3496 if (ip_idx < s_ip_idx) 3497 continue; 3498 err = inet6_fill_ifacaddr(skb, ifaca, 3499 NETLINK_CB(cb->skb).pid, 3500 cb->nlh->nlmsg_seq, 3501 RTM_GETANYCAST, 3502 NLM_F_MULTI); 3503 } 3504 break; 3505 default: 3506 break; 3507 } 3508 read_unlock_bh(&idev->lock); 3509 in6_dev_put(idev); 3510 3511 if (err <= 0) 3512 break; 3513 cont: 3514 idx++; 3515 } 3516 cb->args[0] = idx; 3517 cb->args[1] = ip_idx; 3518 return skb->len; 3519 } 3520 3521 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3522 { 3523 enum addr_type_t type = UNICAST_ADDR; 3524 3525 return inet6_dump_addr(skb, cb, type); 3526 } 3527 3528 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3529 { 3530 enum addr_type_t type = MULTICAST_ADDR; 3531 3532 return inet6_dump_addr(skb, cb, type); 3533 } 3534 3535 3536 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3537 { 3538 enum addr_type_t type = ANYCAST_ADDR; 3539 3540 return inet6_dump_addr(skb, cb, type); 3541 } 3542 3543 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3544 void *arg) 3545 { 3546 struct net *net = sock_net(in_skb->sk); 3547 struct ifaddrmsg *ifm; 3548 struct nlattr *tb[IFA_MAX+1]; 3549 struct in6_addr *addr = NULL; 3550 struct net_device *dev = NULL; 3551 struct inet6_ifaddr *ifa; 3552 struct sk_buff *skb; 3553 int err; 3554 3555 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3556 if (err < 0) 3557 goto errout; 3558 3559 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3560 if (addr == NULL) { 3561 err = -EINVAL; 3562 goto errout; 3563 } 3564 3565 ifm = nlmsg_data(nlh); 3566 if (ifm->ifa_index) 3567 dev = __dev_get_by_index(net, ifm->ifa_index); 3568 3569 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3570 err = -EADDRNOTAVAIL; 3571 goto errout; 3572 } 3573 3574 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3575 err = -ENOBUFS; 3576 goto errout_ifa; 3577 } 3578 3579 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3580 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3581 if (err < 0) { 3582 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3583 WARN_ON(err == -EMSGSIZE); 3584 kfree_skb(skb); 3585 goto errout_ifa; 3586 } 3587 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3588 errout_ifa: 3589 in6_ifa_put(ifa); 3590 errout: 3591 return err; 3592 } 3593 3594 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3595 { 3596 struct sk_buff *skb; 3597 struct net *net = dev_net(ifa->idev->dev); 3598 int err = -ENOBUFS; 3599 3600 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3601 if (skb == NULL) 3602 goto errout; 3603 3604 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3605 if (err < 0) { 3606 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3607 WARN_ON(err == -EMSGSIZE); 3608 kfree_skb(skb); 3609 goto errout; 3610 } 3611 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3612 return; 3613 errout: 3614 if (err < 0) 3615 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3616 } 3617 3618 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3619 __s32 *array, int bytes) 3620 { 3621 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3622 3623 memset(array, 0, bytes); 3624 array[DEVCONF_FORWARDING] = cnf->forwarding; 3625 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3626 array[DEVCONF_MTU6] = cnf->mtu6; 3627 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3628 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3629 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3630 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3631 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3632 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3633 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3634 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3635 #ifdef CONFIG_IPV6_PRIVACY 3636 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3637 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3638 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3639 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3640 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3641 #endif 3642 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3643 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3644 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3645 #ifdef CONFIG_IPV6_ROUTER_PREF 3646 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3647 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3648 #ifdef CONFIG_IPV6_ROUTE_INFO 3649 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3650 #endif 3651 #endif 3652 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3653 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3654 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3655 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3656 #endif 3657 #ifdef CONFIG_IPV6_MROUTE 3658 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3659 #endif 3660 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3661 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3662 } 3663 3664 static inline size_t inet6_if_nlmsg_size(void) 3665 { 3666 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3667 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3668 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3669 + nla_total_size(4) /* IFLA_MTU */ 3670 + nla_total_size(4) /* IFLA_LINK */ 3671 + nla_total_size( /* IFLA_PROTINFO */ 3672 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3673 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3674 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3675 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3676 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3677 ); 3678 } 3679 3680 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3681 int bytes) 3682 { 3683 int i; 3684 int pad = bytes - sizeof(u64) * items; 3685 BUG_ON(pad < 0); 3686 3687 /* Use put_unaligned() because stats may not be aligned for u64. */ 3688 put_unaligned(items, &stats[0]); 3689 for (i = 1; i < items; i++) 3690 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3691 3692 memset(&stats[items], 0, pad); 3693 } 3694 3695 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3696 int bytes) 3697 { 3698 switch(attrtype) { 3699 case IFLA_INET6_STATS: 3700 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3701 break; 3702 case IFLA_INET6_ICMP6STATS: 3703 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3704 break; 3705 } 3706 } 3707 3708 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3709 u32 pid, u32 seq, int event, unsigned int flags) 3710 { 3711 struct net_device *dev = idev->dev; 3712 struct nlattr *nla; 3713 struct ifinfomsg *hdr; 3714 struct nlmsghdr *nlh; 3715 void *protoinfo; 3716 struct ifla_cacheinfo ci; 3717 3718 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3719 if (nlh == NULL) 3720 return -EMSGSIZE; 3721 3722 hdr = nlmsg_data(nlh); 3723 hdr->ifi_family = AF_INET6; 3724 hdr->__ifi_pad = 0; 3725 hdr->ifi_type = dev->type; 3726 hdr->ifi_index = dev->ifindex; 3727 hdr->ifi_flags = dev_get_flags(dev); 3728 hdr->ifi_change = 0; 3729 3730 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3731 3732 if (dev->addr_len) 3733 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3734 3735 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3736 if (dev->ifindex != dev->iflink) 3737 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3738 3739 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3740 if (protoinfo == NULL) 3741 goto nla_put_failure; 3742 3743 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3744 3745 ci.max_reasm_len = IPV6_MAXPLEN; 3746 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3747 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3748 ci.reachable_time = idev->nd_parms->reachable_time; 3749 ci.retrans_time = idev->nd_parms->retrans_time; 3750 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3751 3752 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3753 if (nla == NULL) 3754 goto nla_put_failure; 3755 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3756 3757 /* XXX - MC not implemented */ 3758 3759 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3760 if (nla == NULL) 3761 goto nla_put_failure; 3762 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3763 3764 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3765 if (nla == NULL) 3766 goto nla_put_failure; 3767 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3768 3769 nla_nest_end(skb, protoinfo); 3770 return nlmsg_end(skb, nlh); 3771 3772 nla_put_failure: 3773 nlmsg_cancel(skb, nlh); 3774 return -EMSGSIZE; 3775 } 3776 3777 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3778 { 3779 struct net *net = sock_net(skb->sk); 3780 int idx, err; 3781 int s_idx = cb->args[0]; 3782 struct net_device *dev; 3783 struct inet6_dev *idev; 3784 3785 read_lock(&dev_base_lock); 3786 idx = 0; 3787 for_each_netdev(net, dev) { 3788 if (idx < s_idx) 3789 goto cont; 3790 if ((idev = in6_dev_get(dev)) == NULL) 3791 goto cont; 3792 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3793 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3794 in6_dev_put(idev); 3795 if (err <= 0) 3796 break; 3797 cont: 3798 idx++; 3799 } 3800 read_unlock(&dev_base_lock); 3801 cb->args[0] = idx; 3802 3803 return skb->len; 3804 } 3805 3806 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3807 { 3808 struct sk_buff *skb; 3809 struct net *net = dev_net(idev->dev); 3810 int err = -ENOBUFS; 3811 3812 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3813 if (skb == NULL) 3814 goto errout; 3815 3816 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3817 if (err < 0) { 3818 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3819 WARN_ON(err == -EMSGSIZE); 3820 kfree_skb(skb); 3821 goto errout; 3822 } 3823 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3824 return; 3825 errout: 3826 if (err < 0) 3827 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3828 } 3829 3830 static inline size_t inet6_prefix_nlmsg_size(void) 3831 { 3832 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3833 + nla_total_size(sizeof(struct in6_addr)) 3834 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3835 } 3836 3837 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3838 struct prefix_info *pinfo, u32 pid, u32 seq, 3839 int event, unsigned int flags) 3840 { 3841 struct prefixmsg *pmsg; 3842 struct nlmsghdr *nlh; 3843 struct prefix_cacheinfo ci; 3844 3845 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3846 if (nlh == NULL) 3847 return -EMSGSIZE; 3848 3849 pmsg = nlmsg_data(nlh); 3850 pmsg->prefix_family = AF_INET6; 3851 pmsg->prefix_pad1 = 0; 3852 pmsg->prefix_pad2 = 0; 3853 pmsg->prefix_ifindex = idev->dev->ifindex; 3854 pmsg->prefix_len = pinfo->prefix_len; 3855 pmsg->prefix_type = pinfo->type; 3856 pmsg->prefix_pad3 = 0; 3857 pmsg->prefix_flags = 0; 3858 if (pinfo->onlink) 3859 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3860 if (pinfo->autoconf) 3861 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3862 3863 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3864 3865 ci.preferred_time = ntohl(pinfo->prefered); 3866 ci.valid_time = ntohl(pinfo->valid); 3867 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3868 3869 return nlmsg_end(skb, nlh); 3870 3871 nla_put_failure: 3872 nlmsg_cancel(skb, nlh); 3873 return -EMSGSIZE; 3874 } 3875 3876 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3877 struct prefix_info *pinfo) 3878 { 3879 struct sk_buff *skb; 3880 struct net *net = dev_net(idev->dev); 3881 int err = -ENOBUFS; 3882 3883 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3884 if (skb == NULL) 3885 goto errout; 3886 3887 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3888 if (err < 0) { 3889 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3890 WARN_ON(err == -EMSGSIZE); 3891 kfree_skb(skb); 3892 goto errout; 3893 } 3894 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3895 return; 3896 errout: 3897 if (err < 0) 3898 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3899 } 3900 3901 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3902 { 3903 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3904 3905 switch (event) { 3906 case RTM_NEWADDR: 3907 /* 3908 * If the address was optimistic 3909 * we inserted the route at the start of 3910 * our DAD process, so we don't need 3911 * to do it again 3912 */ 3913 if (!(ifp->rt->rt6i_node)) 3914 ip6_ins_rt(ifp->rt); 3915 if (ifp->idev->cnf.forwarding) 3916 addrconf_join_anycast(ifp); 3917 break; 3918 case RTM_DELADDR: 3919 if (ifp->idev->cnf.forwarding) 3920 addrconf_leave_anycast(ifp); 3921 addrconf_leave_solict(ifp->idev, &ifp->addr); 3922 dst_hold(&ifp->rt->u.dst); 3923 if (ip6_del_rt(ifp->rt)) 3924 dst_free(&ifp->rt->u.dst); 3925 break; 3926 } 3927 } 3928 3929 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3930 { 3931 rcu_read_lock_bh(); 3932 if (likely(ifp->idev->dead == 0)) 3933 __ipv6_ifa_notify(event, ifp); 3934 rcu_read_unlock_bh(); 3935 } 3936 3937 #ifdef CONFIG_SYSCTL 3938 3939 static 3940 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3941 void __user *buffer, size_t *lenp, loff_t *ppos) 3942 { 3943 int *valp = ctl->data; 3944 int val = *valp; 3945 int ret; 3946 3947 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3948 3949 if (write) 3950 ret = addrconf_fixup_forwarding(ctl, valp, val); 3951 return ret; 3952 } 3953 3954 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3955 void __user *oldval, 3956 size_t __user *oldlenp, 3957 void __user *newval, size_t newlen) 3958 { 3959 int *valp = table->data; 3960 int val = *valp; 3961 int new; 3962 3963 if (!newval || !newlen) 3964 return 0; 3965 if (newlen != sizeof(int)) 3966 return -EINVAL; 3967 if (get_user(new, (int __user *)newval)) 3968 return -EFAULT; 3969 if (new == *valp) 3970 return 0; 3971 if (oldval && oldlenp) { 3972 size_t len; 3973 if (get_user(len, oldlenp)) 3974 return -EFAULT; 3975 if (len) { 3976 if (len > table->maxlen) 3977 len = table->maxlen; 3978 if (copy_to_user(oldval, valp, len)) 3979 return -EFAULT; 3980 if (put_user(len, oldlenp)) 3981 return -EFAULT; 3982 } 3983 } 3984 3985 *valp = new; 3986 return addrconf_fixup_forwarding(table, valp, val); 3987 } 3988 3989 static struct addrconf_sysctl_table 3990 { 3991 struct ctl_table_header *sysctl_header; 3992 ctl_table addrconf_vars[DEVCONF_MAX+1]; 3993 char *dev_name; 3994 } addrconf_sysctl __read_mostly = { 3995 .sysctl_header = NULL, 3996 .addrconf_vars = { 3997 { 3998 .ctl_name = NET_IPV6_FORWARDING, 3999 .procname = "forwarding", 4000 .data = &ipv6_devconf.forwarding, 4001 .maxlen = sizeof(int), 4002 .mode = 0644, 4003 .proc_handler = addrconf_sysctl_forward, 4004 .strategy = addrconf_sysctl_forward_strategy, 4005 }, 4006 { 4007 .ctl_name = NET_IPV6_HOP_LIMIT, 4008 .procname = "hop_limit", 4009 .data = &ipv6_devconf.hop_limit, 4010 .maxlen = sizeof(int), 4011 .mode = 0644, 4012 .proc_handler = proc_dointvec, 4013 }, 4014 { 4015 .ctl_name = NET_IPV6_MTU, 4016 .procname = "mtu", 4017 .data = &ipv6_devconf.mtu6, 4018 .maxlen = sizeof(int), 4019 .mode = 0644, 4020 .proc_handler = proc_dointvec, 4021 }, 4022 { 4023 .ctl_name = NET_IPV6_ACCEPT_RA, 4024 .procname = "accept_ra", 4025 .data = &ipv6_devconf.accept_ra, 4026 .maxlen = sizeof(int), 4027 .mode = 0644, 4028 .proc_handler = proc_dointvec, 4029 }, 4030 { 4031 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 4032 .procname = "accept_redirects", 4033 .data = &ipv6_devconf.accept_redirects, 4034 .maxlen = sizeof(int), 4035 .mode = 0644, 4036 .proc_handler = proc_dointvec, 4037 }, 4038 { 4039 .ctl_name = NET_IPV6_AUTOCONF, 4040 .procname = "autoconf", 4041 .data = &ipv6_devconf.autoconf, 4042 .maxlen = sizeof(int), 4043 .mode = 0644, 4044 .proc_handler = proc_dointvec, 4045 }, 4046 { 4047 .ctl_name = NET_IPV6_DAD_TRANSMITS, 4048 .procname = "dad_transmits", 4049 .data = &ipv6_devconf.dad_transmits, 4050 .maxlen = sizeof(int), 4051 .mode = 0644, 4052 .proc_handler = proc_dointvec, 4053 }, 4054 { 4055 .ctl_name = NET_IPV6_RTR_SOLICITS, 4056 .procname = "router_solicitations", 4057 .data = &ipv6_devconf.rtr_solicits, 4058 .maxlen = sizeof(int), 4059 .mode = 0644, 4060 .proc_handler = proc_dointvec, 4061 }, 4062 { 4063 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 4064 .procname = "router_solicitation_interval", 4065 .data = &ipv6_devconf.rtr_solicit_interval, 4066 .maxlen = sizeof(int), 4067 .mode = 0644, 4068 .proc_handler = proc_dointvec_jiffies, 4069 .strategy = sysctl_jiffies, 4070 }, 4071 { 4072 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 4073 .procname = "router_solicitation_delay", 4074 .data = &ipv6_devconf.rtr_solicit_delay, 4075 .maxlen = sizeof(int), 4076 .mode = 0644, 4077 .proc_handler = proc_dointvec_jiffies, 4078 .strategy = sysctl_jiffies, 4079 }, 4080 { 4081 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 4082 .procname = "force_mld_version", 4083 .data = &ipv6_devconf.force_mld_version, 4084 .maxlen = sizeof(int), 4085 .mode = 0644, 4086 .proc_handler = proc_dointvec, 4087 }, 4088 #ifdef CONFIG_IPV6_PRIVACY 4089 { 4090 .ctl_name = NET_IPV6_USE_TEMPADDR, 4091 .procname = "use_tempaddr", 4092 .data = &ipv6_devconf.use_tempaddr, 4093 .maxlen = sizeof(int), 4094 .mode = 0644, 4095 .proc_handler = proc_dointvec, 4096 }, 4097 { 4098 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 4099 .procname = "temp_valid_lft", 4100 .data = &ipv6_devconf.temp_valid_lft, 4101 .maxlen = sizeof(int), 4102 .mode = 0644, 4103 .proc_handler = proc_dointvec, 4104 }, 4105 { 4106 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 4107 .procname = "temp_prefered_lft", 4108 .data = &ipv6_devconf.temp_prefered_lft, 4109 .maxlen = sizeof(int), 4110 .mode = 0644, 4111 .proc_handler = proc_dointvec, 4112 }, 4113 { 4114 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4115 .procname = "regen_max_retry", 4116 .data = &ipv6_devconf.regen_max_retry, 4117 .maxlen = sizeof(int), 4118 .mode = 0644, 4119 .proc_handler = proc_dointvec, 4120 }, 4121 { 4122 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4123 .procname = "max_desync_factor", 4124 .data = &ipv6_devconf.max_desync_factor, 4125 .maxlen = sizeof(int), 4126 .mode = 0644, 4127 .proc_handler = proc_dointvec, 4128 }, 4129 #endif 4130 { 4131 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4132 .procname = "max_addresses", 4133 .data = &ipv6_devconf.max_addresses, 4134 .maxlen = sizeof(int), 4135 .mode = 0644, 4136 .proc_handler = proc_dointvec, 4137 }, 4138 { 4139 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4140 .procname = "accept_ra_defrtr", 4141 .data = &ipv6_devconf.accept_ra_defrtr, 4142 .maxlen = sizeof(int), 4143 .mode = 0644, 4144 .proc_handler = proc_dointvec, 4145 }, 4146 { 4147 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4148 .procname = "accept_ra_pinfo", 4149 .data = &ipv6_devconf.accept_ra_pinfo, 4150 .maxlen = sizeof(int), 4151 .mode = 0644, 4152 .proc_handler = proc_dointvec, 4153 }, 4154 #ifdef CONFIG_IPV6_ROUTER_PREF 4155 { 4156 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4157 .procname = "accept_ra_rtr_pref", 4158 .data = &ipv6_devconf.accept_ra_rtr_pref, 4159 .maxlen = sizeof(int), 4160 .mode = 0644, 4161 .proc_handler = proc_dointvec, 4162 }, 4163 { 4164 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4165 .procname = "router_probe_interval", 4166 .data = &ipv6_devconf.rtr_probe_interval, 4167 .maxlen = sizeof(int), 4168 .mode = 0644, 4169 .proc_handler = proc_dointvec_jiffies, 4170 .strategy = sysctl_jiffies, 4171 }, 4172 #ifdef CONFIG_IPV6_ROUTE_INFO 4173 { 4174 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4175 .procname = "accept_ra_rt_info_max_plen", 4176 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4177 .maxlen = sizeof(int), 4178 .mode = 0644, 4179 .proc_handler = proc_dointvec, 4180 }, 4181 #endif 4182 #endif 4183 { 4184 .ctl_name = NET_IPV6_PROXY_NDP, 4185 .procname = "proxy_ndp", 4186 .data = &ipv6_devconf.proxy_ndp, 4187 .maxlen = sizeof(int), 4188 .mode = 0644, 4189 .proc_handler = proc_dointvec, 4190 }, 4191 { 4192 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4193 .procname = "accept_source_route", 4194 .data = &ipv6_devconf.accept_source_route, 4195 .maxlen = sizeof(int), 4196 .mode = 0644, 4197 .proc_handler = proc_dointvec, 4198 }, 4199 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4200 { 4201 .ctl_name = CTL_UNNUMBERED, 4202 .procname = "optimistic_dad", 4203 .data = &ipv6_devconf.optimistic_dad, 4204 .maxlen = sizeof(int), 4205 .mode = 0644, 4206 .proc_handler = proc_dointvec, 4207 4208 }, 4209 #endif 4210 #ifdef CONFIG_IPV6_MROUTE 4211 { 4212 .ctl_name = CTL_UNNUMBERED, 4213 .procname = "mc_forwarding", 4214 .data = &ipv6_devconf.mc_forwarding, 4215 .maxlen = sizeof(int), 4216 .mode = 0444, 4217 .proc_handler = proc_dointvec, 4218 }, 4219 #endif 4220 { 4221 .ctl_name = CTL_UNNUMBERED, 4222 .procname = "disable_ipv6", 4223 .data = &ipv6_devconf.disable_ipv6, 4224 .maxlen = sizeof(int), 4225 .mode = 0644, 4226 .proc_handler = proc_dointvec, 4227 }, 4228 { 4229 .ctl_name = CTL_UNNUMBERED, 4230 .procname = "accept_dad", 4231 .data = &ipv6_devconf.accept_dad, 4232 .maxlen = sizeof(int), 4233 .mode = 0644, 4234 .proc_handler = proc_dointvec, 4235 }, 4236 { 4237 .ctl_name = 0, /* sentinel */ 4238 } 4239 }, 4240 }; 4241 4242 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4243 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4244 { 4245 int i; 4246 struct addrconf_sysctl_table *t; 4247 4248 #define ADDRCONF_CTL_PATH_DEV 3 4249 4250 struct ctl_path addrconf_ctl_path[] = { 4251 { .procname = "net", .ctl_name = CTL_NET, }, 4252 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4253 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4254 { /* to be set */ }, 4255 { }, 4256 }; 4257 4258 4259 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4260 if (t == NULL) 4261 goto out; 4262 4263 for (i=0; t->addrconf_vars[i].data; i++) { 4264 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4265 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4266 t->addrconf_vars[i].extra2 = net; 4267 } 4268 4269 /* 4270 * Make a copy of dev_name, because '.procname' is regarded as const 4271 * by sysctl and we wouldn't want anyone to change it under our feet 4272 * (see SIOCSIFNAME). 4273 */ 4274 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4275 if (!t->dev_name) 4276 goto free; 4277 4278 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4279 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4280 4281 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4282 t->addrconf_vars); 4283 if (t->sysctl_header == NULL) 4284 goto free_procname; 4285 4286 p->sysctl = t; 4287 return 0; 4288 4289 free_procname: 4290 kfree(t->dev_name); 4291 free: 4292 kfree(t); 4293 out: 4294 return -ENOBUFS; 4295 } 4296 4297 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4298 { 4299 struct addrconf_sysctl_table *t; 4300 4301 if (p->sysctl == NULL) 4302 return; 4303 4304 t = p->sysctl; 4305 p->sysctl = NULL; 4306 unregister_sysctl_table(t->sysctl_header); 4307 kfree(t->dev_name); 4308 kfree(t); 4309 } 4310 4311 static void addrconf_sysctl_register(struct inet6_dev *idev) 4312 { 4313 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4314 NET_IPV6_NEIGH, "ipv6", 4315 &ndisc_ifinfo_sysctl_change, 4316 ndisc_ifinfo_sysctl_strategy); 4317 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4318 idev->dev->ifindex, idev, &idev->cnf); 4319 } 4320 4321 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4322 { 4323 __addrconf_sysctl_unregister(&idev->cnf); 4324 neigh_sysctl_unregister(idev->nd_parms); 4325 } 4326 4327 4328 #endif 4329 4330 static int addrconf_init_net(struct net *net) 4331 { 4332 int err; 4333 struct ipv6_devconf *all, *dflt; 4334 4335 err = -ENOMEM; 4336 all = &ipv6_devconf; 4337 dflt = &ipv6_devconf_dflt; 4338 4339 if (net != &init_net) { 4340 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4341 if (all == NULL) 4342 goto err_alloc_all; 4343 4344 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4345 if (dflt == NULL) 4346 goto err_alloc_dflt; 4347 } 4348 4349 net->ipv6.devconf_all = all; 4350 net->ipv6.devconf_dflt = dflt; 4351 4352 #ifdef CONFIG_SYSCTL 4353 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4354 NULL, all); 4355 if (err < 0) 4356 goto err_reg_all; 4357 4358 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4359 NULL, dflt); 4360 if (err < 0) 4361 goto err_reg_dflt; 4362 #endif 4363 return 0; 4364 4365 #ifdef CONFIG_SYSCTL 4366 err_reg_dflt: 4367 __addrconf_sysctl_unregister(all); 4368 err_reg_all: 4369 kfree(dflt); 4370 #endif 4371 err_alloc_dflt: 4372 kfree(all); 4373 err_alloc_all: 4374 return err; 4375 } 4376 4377 static void addrconf_exit_net(struct net *net) 4378 { 4379 #ifdef CONFIG_SYSCTL 4380 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4381 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4382 #endif 4383 if (net != &init_net) { 4384 kfree(net->ipv6.devconf_dflt); 4385 kfree(net->ipv6.devconf_all); 4386 } 4387 } 4388 4389 static struct pernet_operations addrconf_ops = { 4390 .init = addrconf_init_net, 4391 .exit = addrconf_exit_net, 4392 }; 4393 4394 /* 4395 * Device notifier 4396 */ 4397 4398 int register_inet6addr_notifier(struct notifier_block *nb) 4399 { 4400 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4401 } 4402 4403 EXPORT_SYMBOL(register_inet6addr_notifier); 4404 4405 int unregister_inet6addr_notifier(struct notifier_block *nb) 4406 { 4407 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4408 } 4409 4410 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4411 4412 /* 4413 * Init / cleanup code 4414 */ 4415 4416 int __init addrconf_init(void) 4417 { 4418 int err; 4419 4420 if ((err = ipv6_addr_label_init()) < 0) { 4421 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4422 err); 4423 return err; 4424 } 4425 4426 register_pernet_subsys(&addrconf_ops); 4427 4428 /* The addrconf netdev notifier requires that loopback_dev 4429 * has it's ipv6 private information allocated and setup 4430 * before it can bring up and give link-local addresses 4431 * to other devices which are up. 4432 * 4433 * Unfortunately, loopback_dev is not necessarily the first 4434 * entry in the global dev_base list of net devices. In fact, 4435 * it is likely to be the very last entry on that list. 4436 * So this causes the notifier registry below to try and 4437 * give link-local addresses to all devices besides loopback_dev 4438 * first, then loopback_dev, which cases all the non-loopback_dev 4439 * devices to fail to get a link-local address. 4440 * 4441 * So, as a temporary fix, allocate the ipv6 structure for 4442 * loopback_dev first by hand. 4443 * Longer term, all of the dependencies ipv6 has upon the loopback 4444 * device and it being up should be removed. 4445 */ 4446 rtnl_lock(); 4447 if (!ipv6_add_dev(init_net.loopback_dev)) 4448 err = -ENOMEM; 4449 rtnl_unlock(); 4450 if (err) 4451 goto errlo; 4452 4453 register_netdevice_notifier(&ipv6_dev_notf); 4454 4455 addrconf_verify(0); 4456 4457 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4458 if (err < 0) 4459 goto errout; 4460 4461 /* Only the first call to __rtnl_register can fail */ 4462 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4463 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4464 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4465 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4466 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4467 4468 ipv6_addr_label_rtnl_register(); 4469 4470 return 0; 4471 errout: 4472 unregister_netdevice_notifier(&ipv6_dev_notf); 4473 errlo: 4474 unregister_pernet_subsys(&addrconf_ops); 4475 4476 return err; 4477 } 4478 4479 void addrconf_cleanup(void) 4480 { 4481 struct inet6_ifaddr *ifa; 4482 struct net_device *dev; 4483 int i; 4484 4485 unregister_netdevice_notifier(&ipv6_dev_notf); 4486 unregister_pernet_subsys(&addrconf_ops); 4487 4488 rtnl_lock(); 4489 4490 /* clean dev list */ 4491 for_each_netdev(&init_net, dev) { 4492 if (__in6_dev_get(dev) == NULL) 4493 continue; 4494 addrconf_ifdown(dev, 1); 4495 } 4496 addrconf_ifdown(init_net.loopback_dev, 2); 4497 4498 /* 4499 * Check hash table. 4500 */ 4501 write_lock_bh(&addrconf_hash_lock); 4502 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4503 for (ifa=inet6_addr_lst[i]; ifa; ) { 4504 struct inet6_ifaddr *bifa; 4505 4506 bifa = ifa; 4507 ifa = ifa->lst_next; 4508 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4509 /* Do not free it; something is wrong. 4510 Now we can investigate it with debugger. 4511 */ 4512 } 4513 } 4514 write_unlock_bh(&addrconf_hash_lock); 4515 4516 del_timer(&addr_chk_timer); 4517 rtnl_unlock(); 4518 } 4519