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 void addrconf_bonding_change(struct net_device *dev, 141 unsigned long event); 142 static int addrconf_ifdown(struct net_device *dev, int how); 143 144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 145 static void addrconf_dad_timer(unsigned long data); 146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 147 static void addrconf_dad_run(struct inet6_dev *idev); 148 static void addrconf_rs_timer(unsigned long data); 149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 151 152 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 153 struct prefix_info *pinfo); 154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 155 struct net_device *dev); 156 157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 158 159 static struct ipv6_devconf ipv6_devconf __read_mostly = { 160 .forwarding = 0, 161 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 162 .mtu6 = IPV6_MIN_MTU, 163 .accept_ra = 1, 164 .accept_redirects = 1, 165 .autoconf = 1, 166 .force_mld_version = 0, 167 .dad_transmits = 1, 168 .rtr_solicits = MAX_RTR_SOLICITATIONS, 169 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 170 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 171 #ifdef CONFIG_IPV6_PRIVACY 172 .use_tempaddr = 0, 173 .temp_valid_lft = TEMP_VALID_LIFETIME, 174 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 175 .regen_max_retry = REGEN_MAX_RETRY, 176 .max_desync_factor = MAX_DESYNC_FACTOR, 177 #endif 178 .max_addresses = IPV6_MAX_ADDRESSES, 179 .accept_ra_defrtr = 1, 180 .accept_ra_pinfo = 1, 181 #ifdef CONFIG_IPV6_ROUTER_PREF 182 .accept_ra_rtr_pref = 1, 183 .rtr_probe_interval = 60 * HZ, 184 #ifdef CONFIG_IPV6_ROUTE_INFO 185 .accept_ra_rt_info_max_plen = 0, 186 #endif 187 #endif 188 .proxy_ndp = 0, 189 .accept_source_route = 0, /* we do not accept RH0 by default. */ 190 .disable_ipv6 = 0, 191 .accept_dad = 1, 192 }; 193 194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 195 .forwarding = 0, 196 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 197 .mtu6 = IPV6_MIN_MTU, 198 .accept_ra = 1, 199 .accept_redirects = 1, 200 .autoconf = 1, 201 .dad_transmits = 1, 202 .rtr_solicits = MAX_RTR_SOLICITATIONS, 203 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 205 #ifdef CONFIG_IPV6_PRIVACY 206 .use_tempaddr = 0, 207 .temp_valid_lft = TEMP_VALID_LIFETIME, 208 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 209 .regen_max_retry = REGEN_MAX_RETRY, 210 .max_desync_factor = MAX_DESYNC_FACTOR, 211 #endif 212 .max_addresses = IPV6_MAX_ADDRESSES, 213 .accept_ra_defrtr = 1, 214 .accept_ra_pinfo = 1, 215 #ifdef CONFIG_IPV6_ROUTER_PREF 216 .accept_ra_rtr_pref = 1, 217 .rtr_probe_interval = 60 * HZ, 218 #ifdef CONFIG_IPV6_ROUTE_INFO 219 .accept_ra_rt_info_max_plen = 0, 220 #endif 221 #endif 222 .proxy_ndp = 0, 223 .accept_source_route = 0, /* we do not accept RH0 by default. */ 224 .disable_ipv6 = 0, 225 .accept_dad = 1, 226 }; 227 228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 233 234 /* Check if a valid qdisc is available */ 235 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 236 { 237 return !qdisc_tx_is_noop(dev); 238 } 239 240 /* Check if a route is valid prefix route */ 241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 242 { 243 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0); 244 } 245 246 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 247 { 248 if (del_timer(&ifp->timer)) 249 __in6_ifa_put(ifp); 250 } 251 252 enum addrconf_timer_t 253 { 254 AC_NONE, 255 AC_DAD, 256 AC_RS, 257 }; 258 259 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 260 enum addrconf_timer_t what, 261 unsigned long when) 262 { 263 if (!del_timer(&ifp->timer)) 264 in6_ifa_hold(ifp); 265 266 switch (what) { 267 case AC_DAD: 268 ifp->timer.function = addrconf_dad_timer; 269 break; 270 case AC_RS: 271 ifp->timer.function = addrconf_rs_timer; 272 break; 273 default:; 274 } 275 ifp->timer.expires = jiffies + when; 276 add_timer(&ifp->timer); 277 } 278 279 static int snmp6_alloc_dev(struct inet6_dev *idev) 280 { 281 if (snmp_mib_init((void **)idev->stats.ipv6, 282 sizeof(struct ipstats_mib)) < 0) 283 goto err_ip; 284 if (snmp_mib_init((void **)idev->stats.icmpv6, 285 sizeof(struct icmpv6_mib)) < 0) 286 goto err_icmp; 287 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 288 sizeof(struct icmpv6msg_mib)) < 0) 289 goto err_icmpmsg; 290 291 return 0; 292 293 err_icmpmsg: 294 snmp_mib_free((void **)idev->stats.icmpv6); 295 err_icmp: 296 snmp_mib_free((void **)idev->stats.ipv6); 297 err_ip: 298 return -ENOMEM; 299 } 300 301 static void snmp6_free_dev(struct inet6_dev *idev) 302 { 303 snmp_mib_free((void **)idev->stats.icmpv6msg); 304 snmp_mib_free((void **)idev->stats.icmpv6); 305 snmp_mib_free((void **)idev->stats.ipv6); 306 } 307 308 /* Nobody refers to this device, we may destroy it. */ 309 310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 311 { 312 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 313 kfree(idev); 314 } 315 316 void in6_dev_finish_destroy(struct inet6_dev *idev) 317 { 318 struct net_device *dev = idev->dev; 319 320 WARN_ON(idev->addr_list != NULL); 321 WARN_ON(idev->mc_list != NULL); 322 323 #ifdef NET_REFCNT_DEBUG 324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 325 #endif 326 dev_put(dev); 327 if (!idev->dead) { 328 printk("Freeing alive inet6 device %p\n", idev); 329 return; 330 } 331 snmp6_free_dev(idev); 332 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 333 } 334 335 EXPORT_SYMBOL(in6_dev_finish_destroy); 336 337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 338 { 339 struct inet6_dev *ndev; 340 341 ASSERT_RTNL(); 342 343 if (dev->mtu < IPV6_MIN_MTU) 344 return NULL; 345 346 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 347 348 if (ndev == NULL) 349 return NULL; 350 351 rwlock_init(&ndev->lock); 352 ndev->dev = dev; 353 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 354 ndev->cnf.mtu6 = dev->mtu; 355 ndev->cnf.sysctl = NULL; 356 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 357 if (ndev->nd_parms == NULL) { 358 kfree(ndev); 359 return NULL; 360 } 361 if (ndev->cnf.forwarding) 362 dev_disable_lro(dev); 363 /* We refer to the device */ 364 dev_hold(dev); 365 366 if (snmp6_alloc_dev(ndev) < 0) { 367 ADBG((KERN_WARNING 368 "%s(): cannot allocate memory for statistics; dev=%s.\n", 369 __func__, dev->name)); 370 neigh_parms_release(&nd_tbl, ndev->nd_parms); 371 ndev->dead = 1; 372 in6_dev_finish_destroy(ndev); 373 return NULL; 374 } 375 376 if (snmp6_register_dev(ndev) < 0) { 377 ADBG((KERN_WARNING 378 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 379 __func__, dev->name)); 380 neigh_parms_release(&nd_tbl, ndev->nd_parms); 381 ndev->dead = 1; 382 in6_dev_finish_destroy(ndev); 383 return NULL; 384 } 385 386 /* One reference from device. We must do this before 387 * we invoke __ipv6_regen_rndid(). 388 */ 389 in6_dev_hold(ndev); 390 391 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 392 ndev->cnf.accept_dad = -1; 393 394 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 395 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 396 printk(KERN_INFO 397 "%s: Disabled Multicast RS\n", 398 dev->name); 399 ndev->cnf.rtr_solicits = 0; 400 } 401 #endif 402 403 #ifdef CONFIG_IPV6_PRIVACY 404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 405 if ((dev->flags&IFF_LOOPBACK) || 406 dev->type == ARPHRD_TUNNEL || 407 dev->type == ARPHRD_TUNNEL6 || 408 dev->type == ARPHRD_SIT || 409 dev->type == ARPHRD_NONE) { 410 printk(KERN_INFO 411 "%s: Disabled Privacy Extensions\n", 412 dev->name); 413 ndev->cnf.use_tempaddr = -1; 414 } else { 415 in6_dev_hold(ndev); 416 ipv6_regen_rndid((unsigned long) ndev); 417 } 418 #endif 419 420 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 421 ndev->if_flags |= IF_READY; 422 423 ipv6_mc_init_dev(ndev); 424 ndev->tstamp = jiffies; 425 addrconf_sysctl_register(ndev); 426 /* protected by rtnl_lock */ 427 rcu_assign_pointer(dev->ip6_ptr, ndev); 428 429 /* Join all-node multicast group */ 430 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 431 432 return ndev; 433 } 434 435 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 436 { 437 struct inet6_dev *idev; 438 439 ASSERT_RTNL(); 440 441 if ((idev = __in6_dev_get(dev)) == NULL) { 442 if ((idev = ipv6_add_dev(dev)) == NULL) 443 return NULL; 444 } 445 446 if (dev->flags&IFF_UP) 447 ipv6_mc_up(idev); 448 return idev; 449 } 450 451 #ifdef CONFIG_SYSCTL 452 static void dev_forward_change(struct inet6_dev *idev) 453 { 454 struct net_device *dev; 455 struct inet6_ifaddr *ifa; 456 457 if (!idev) 458 return; 459 dev = idev->dev; 460 if (idev->cnf.forwarding) 461 dev_disable_lro(dev); 462 if (dev && (dev->flags & IFF_MULTICAST)) { 463 if (idev->cnf.forwarding) 464 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 465 else 466 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 467 } 468 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 469 if (ifa->flags&IFA_F_TENTATIVE) 470 continue; 471 if (idev->cnf.forwarding) 472 addrconf_join_anycast(ifa); 473 else 474 addrconf_leave_anycast(ifa); 475 } 476 } 477 478 479 static void addrconf_forward_change(struct net *net, __s32 newf) 480 { 481 struct net_device *dev; 482 struct inet6_dev *idev; 483 484 rcu_read_lock(); 485 for_each_netdev_rcu(net, dev) { 486 idev = __in6_dev_get(dev); 487 if (idev) { 488 int changed = (!idev->cnf.forwarding) ^ (!newf); 489 idev->cnf.forwarding = newf; 490 if (changed) 491 dev_forward_change(idev); 492 } 493 } 494 rcu_read_unlock(); 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 restart_syscall(); 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 int hash; 595 int err = 0; 596 int addr_type = ipv6_addr_type(addr); 597 598 if (addr_type == IPV6_ADDR_ANY || 599 addr_type & IPV6_ADDR_MULTICAST || 600 (!(idev->dev->flags & IFF_LOOPBACK) && 601 addr_type & IPV6_ADDR_LOOPBACK)) 602 return ERR_PTR(-EADDRNOTAVAIL); 603 604 rcu_read_lock_bh(); 605 if (idev->dead) { 606 err = -ENODEV; /*XXX*/ 607 goto out2; 608 } 609 610 if (idev->cnf.disable_ipv6) { 611 err = -EACCES; 612 goto out2; 613 } 614 615 write_lock(&addrconf_hash_lock); 616 617 /* Ignore adding duplicate addresses on an interface */ 618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 619 ADBG(("ipv6_add_addr: already assigned\n")); 620 err = -EEXIST; 621 goto out; 622 } 623 624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 625 626 if (ifa == NULL) { 627 ADBG(("ipv6_add_addr: malloc failed\n")); 628 err = -ENOBUFS; 629 goto out; 630 } 631 632 rt = addrconf_dst_alloc(idev, addr, 0); 633 if (IS_ERR(rt)) { 634 err = PTR_ERR(rt); 635 goto out; 636 } 637 638 ipv6_addr_copy(&ifa->addr, addr); 639 640 spin_lock_init(&ifa->lock); 641 init_timer(&ifa->timer); 642 ifa->timer.data = (unsigned long) ifa; 643 ifa->scope = scope; 644 ifa->prefix_len = pfxlen; 645 ifa->flags = flags | IFA_F_TENTATIVE; 646 ifa->cstamp = ifa->tstamp = jiffies; 647 648 ifa->rt = rt; 649 650 /* 651 * part one of RFC 4429, section 3.3 652 * We should not configure an address as 653 * optimistic if we do not yet know the link 654 * layer address of our nexhop router 655 */ 656 657 if (rt->rt6i_nexthop == NULL) 658 ifa->flags &= ~IFA_F_OPTIMISTIC; 659 660 ifa->idev = idev; 661 in6_dev_hold(idev); 662 /* For caller */ 663 in6_ifa_hold(ifa); 664 665 /* Add to big hash table */ 666 hash = ipv6_addr_hash(addr); 667 668 ifa->lst_next = inet6_addr_lst[hash]; 669 inet6_addr_lst[hash] = ifa; 670 in6_ifa_hold(ifa); 671 write_unlock(&addrconf_hash_lock); 672 673 write_lock(&idev->lock); 674 /* Add to inet6_dev unicast addr list. */ 675 ipv6_link_dev_addr(idev, ifa); 676 677 #ifdef CONFIG_IPV6_PRIVACY 678 if (ifa->flags&IFA_F_TEMPORARY) { 679 ifa->tmp_next = idev->tempaddr_list; 680 idev->tempaddr_list = ifa; 681 in6_ifa_hold(ifa); 682 } 683 #endif 684 685 in6_ifa_hold(ifa); 686 write_unlock(&idev->lock); 687 out2: 688 rcu_read_unlock_bh(); 689 690 if (likely(err == 0)) 691 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 692 else { 693 kfree(ifa); 694 ifa = ERR_PTR(err); 695 } 696 697 return ifa; 698 out: 699 write_unlock(&addrconf_hash_lock); 700 goto out2; 701 } 702 703 /* This function wants to get referenced ifp and releases it before return */ 704 705 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 706 { 707 struct inet6_ifaddr *ifa, **ifap; 708 struct inet6_dev *idev = ifp->idev; 709 int hash; 710 int deleted = 0, onlink = 0; 711 unsigned long expires = jiffies; 712 713 hash = ipv6_addr_hash(&ifp->addr); 714 715 ifp->dead = 1; 716 717 write_lock_bh(&addrconf_hash_lock); 718 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 719 ifap = &ifa->lst_next) { 720 if (ifa == ifp) { 721 *ifap = ifa->lst_next; 722 __in6_ifa_put(ifp); 723 ifa->lst_next = NULL; 724 break; 725 } 726 } 727 write_unlock_bh(&addrconf_hash_lock); 728 729 write_lock_bh(&idev->lock); 730 #ifdef CONFIG_IPV6_PRIVACY 731 if (ifp->flags&IFA_F_TEMPORARY) { 732 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 733 ifap = &ifa->tmp_next) { 734 if (ifa == ifp) { 735 *ifap = ifa->tmp_next; 736 if (ifp->ifpub) { 737 in6_ifa_put(ifp->ifpub); 738 ifp->ifpub = NULL; 739 } 740 __in6_ifa_put(ifp); 741 ifa->tmp_next = NULL; 742 break; 743 } 744 } 745 } 746 #endif 747 748 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 749 if (ifa == ifp) { 750 *ifap = ifa->if_next; 751 __in6_ifa_put(ifp); 752 ifa->if_next = NULL; 753 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 754 break; 755 deleted = 1; 756 continue; 757 } else if (ifp->flags & IFA_F_PERMANENT) { 758 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 759 ifp->prefix_len)) { 760 if (ifa->flags & IFA_F_PERMANENT) { 761 onlink = 1; 762 if (deleted) 763 break; 764 } else { 765 unsigned long lifetime; 766 767 if (!onlink) 768 onlink = -1; 769 770 spin_lock(&ifa->lock); 771 772 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 773 /* 774 * Note: Because this address is 775 * not permanent, lifetime < 776 * LONG_MAX / HZ here. 777 */ 778 if (time_before(expires, 779 ifa->tstamp + lifetime * HZ)) 780 expires = ifa->tstamp + lifetime * HZ; 781 spin_unlock(&ifa->lock); 782 } 783 } 784 } 785 ifap = &ifa->if_next; 786 } 787 write_unlock_bh(&idev->lock); 788 789 addrconf_del_timer(ifp); 790 791 ipv6_ifa_notify(RTM_DELADDR, ifp); 792 793 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 794 795 /* 796 * Purge or update corresponding prefix 797 * 798 * 1) we don't purge prefix here if address was not permanent. 799 * prefix is managed by its own lifetime. 800 * 2) if there're no addresses, delete prefix. 801 * 3) if there're still other permanent address(es), 802 * corresponding prefix is still permanent. 803 * 4) otherwise, update prefix lifetime to the 804 * longest valid lifetime among the corresponding 805 * addresses on the device. 806 * Note: subsequent RA will update lifetime. 807 * 808 * --yoshfuji 809 */ 810 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 811 struct in6_addr prefix; 812 struct rt6_info *rt; 813 struct net *net = dev_net(ifp->idev->dev); 814 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 815 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 816 817 if (rt && addrconf_is_prefix_route(rt)) { 818 if (onlink == 0) { 819 ip6_del_rt(rt); 820 rt = NULL; 821 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 822 rt->rt6i_expires = expires; 823 rt->rt6i_flags |= RTF_EXPIRES; 824 } 825 } 826 dst_release(&rt->u.dst); 827 } 828 829 in6_ifa_put(ifp); 830 } 831 832 #ifdef CONFIG_IPV6_PRIVACY 833 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 834 { 835 struct inet6_dev *idev = ifp->idev; 836 struct in6_addr addr, *tmpaddr; 837 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 838 unsigned long regen_advance; 839 int tmp_plen; 840 int ret = 0; 841 int max_addresses; 842 u32 addr_flags; 843 844 write_lock(&idev->lock); 845 if (ift) { 846 spin_lock_bh(&ift->lock); 847 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 848 spin_unlock_bh(&ift->lock); 849 tmpaddr = &addr; 850 } else { 851 tmpaddr = NULL; 852 } 853 retry: 854 in6_dev_hold(idev); 855 if (idev->cnf.use_tempaddr <= 0) { 856 write_unlock(&idev->lock); 857 printk(KERN_INFO 858 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 859 in6_dev_put(idev); 860 ret = -1; 861 goto out; 862 } 863 spin_lock_bh(&ifp->lock); 864 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 865 idev->cnf.use_tempaddr = -1; /*XXX*/ 866 spin_unlock_bh(&ifp->lock); 867 write_unlock(&idev->lock); 868 printk(KERN_WARNING 869 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 870 in6_dev_put(idev); 871 ret = -1; 872 goto out; 873 } 874 in6_ifa_hold(ifp); 875 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 876 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 877 spin_unlock_bh(&ifp->lock); 878 write_unlock(&idev->lock); 879 printk(KERN_WARNING 880 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 881 in6_ifa_put(ifp); 882 in6_dev_put(idev); 883 ret = -1; 884 goto out; 885 } 886 memcpy(&addr.s6_addr[8], idev->rndid, 8); 887 tmp_valid_lft = min_t(__u32, 888 ifp->valid_lft, 889 idev->cnf.temp_valid_lft); 890 tmp_prefered_lft = min_t(__u32, 891 ifp->prefered_lft, 892 idev->cnf.temp_prefered_lft - desync_factor / HZ); 893 tmp_plen = ifp->prefix_len; 894 max_addresses = idev->cnf.max_addresses; 895 tmp_cstamp = ifp->cstamp; 896 tmp_tstamp = ifp->tstamp; 897 spin_unlock_bh(&ifp->lock); 898 899 regen_advance = idev->cnf.regen_max_retry * 900 idev->cnf.dad_transmits * 901 idev->nd_parms->retrans_time / HZ; 902 write_unlock(&idev->lock); 903 904 /* A temporary address is created only if this calculated Preferred 905 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 906 * an implementation must not create a temporary address with a zero 907 * Preferred Lifetime. 908 */ 909 if (tmp_prefered_lft <= regen_advance) { 910 in6_ifa_put(ifp); 911 in6_dev_put(idev); 912 ret = -1; 913 goto out; 914 } 915 916 addr_flags = IFA_F_TEMPORARY; 917 /* set in addrconf_prefix_rcv() */ 918 if (ifp->flags & IFA_F_OPTIMISTIC) 919 addr_flags |= IFA_F_OPTIMISTIC; 920 921 ift = !max_addresses || 922 ipv6_count_addresses(idev) < max_addresses ? 923 ipv6_add_addr(idev, &addr, tmp_plen, 924 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 925 addr_flags) : NULL; 926 if (!ift || IS_ERR(ift)) { 927 in6_ifa_put(ifp); 928 in6_dev_put(idev); 929 printk(KERN_INFO 930 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 931 tmpaddr = &addr; 932 write_lock(&idev->lock); 933 goto retry; 934 } 935 936 spin_lock_bh(&ift->lock); 937 ift->ifpub = ifp; 938 ift->valid_lft = tmp_valid_lft; 939 ift->prefered_lft = tmp_prefered_lft; 940 ift->cstamp = tmp_cstamp; 941 ift->tstamp = tmp_tstamp; 942 spin_unlock_bh(&ift->lock); 943 944 addrconf_dad_start(ift, 0); 945 in6_ifa_put(ift); 946 in6_dev_put(idev); 947 out: 948 return ret; 949 } 950 #endif 951 952 /* 953 * Choose an appropriate source address (RFC3484) 954 */ 955 enum { 956 IPV6_SADDR_RULE_INIT = 0, 957 IPV6_SADDR_RULE_LOCAL, 958 IPV6_SADDR_RULE_SCOPE, 959 IPV6_SADDR_RULE_PREFERRED, 960 #ifdef CONFIG_IPV6_MIP6 961 IPV6_SADDR_RULE_HOA, 962 #endif 963 IPV6_SADDR_RULE_OIF, 964 IPV6_SADDR_RULE_LABEL, 965 #ifdef CONFIG_IPV6_PRIVACY 966 IPV6_SADDR_RULE_PRIVACY, 967 #endif 968 IPV6_SADDR_RULE_ORCHID, 969 IPV6_SADDR_RULE_PREFIX, 970 IPV6_SADDR_RULE_MAX 971 }; 972 973 struct ipv6_saddr_score { 974 int rule; 975 int addr_type; 976 struct inet6_ifaddr *ifa; 977 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 978 int scopedist; 979 int matchlen; 980 }; 981 982 struct ipv6_saddr_dst { 983 const struct in6_addr *addr; 984 int ifindex; 985 int scope; 986 int label; 987 unsigned int prefs; 988 }; 989 990 static inline int ipv6_saddr_preferred(int type) 991 { 992 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 993 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 994 return 1; 995 return 0; 996 } 997 998 static int ipv6_get_saddr_eval(struct net *net, 999 struct ipv6_saddr_score *score, 1000 struct ipv6_saddr_dst *dst, 1001 int i) 1002 { 1003 int ret; 1004 1005 if (i <= score->rule) { 1006 switch (i) { 1007 case IPV6_SADDR_RULE_SCOPE: 1008 ret = score->scopedist; 1009 break; 1010 case IPV6_SADDR_RULE_PREFIX: 1011 ret = score->matchlen; 1012 break; 1013 default: 1014 ret = !!test_bit(i, score->scorebits); 1015 } 1016 goto out; 1017 } 1018 1019 switch (i) { 1020 case IPV6_SADDR_RULE_INIT: 1021 /* Rule 0: remember if hiscore is not ready yet */ 1022 ret = !!score->ifa; 1023 break; 1024 case IPV6_SADDR_RULE_LOCAL: 1025 /* Rule 1: Prefer same address */ 1026 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1027 break; 1028 case IPV6_SADDR_RULE_SCOPE: 1029 /* Rule 2: Prefer appropriate scope 1030 * 1031 * ret 1032 * ^ 1033 * -1 | d 15 1034 * ---+--+-+---> scope 1035 * | 1036 * | d is scope of the destination. 1037 * B-d | \ 1038 * | \ <- smaller scope is better if 1039 * B-15 | \ if scope is enough for destinaion. 1040 * | ret = B - scope (-1 <= scope >= d <= 15). 1041 * d-C-1 | / 1042 * |/ <- greater is better 1043 * -C / if scope is not enough for destination. 1044 * /| ret = scope - C (-1 <= d < scope <= 15). 1045 * 1046 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1047 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1048 * Assume B = 0 and we get C > 29. 1049 */ 1050 ret = __ipv6_addr_src_scope(score->addr_type); 1051 if (ret >= dst->scope) 1052 ret = -ret; 1053 else 1054 ret -= 128; /* 30 is enough */ 1055 score->scopedist = ret; 1056 break; 1057 case IPV6_SADDR_RULE_PREFERRED: 1058 /* Rule 3: Avoid deprecated and optimistic addresses */ 1059 ret = ipv6_saddr_preferred(score->addr_type) || 1060 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1061 break; 1062 #ifdef CONFIG_IPV6_MIP6 1063 case IPV6_SADDR_RULE_HOA: 1064 { 1065 /* Rule 4: Prefer home address */ 1066 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1067 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1068 break; 1069 } 1070 #endif 1071 case IPV6_SADDR_RULE_OIF: 1072 /* Rule 5: Prefer outgoing interface */ 1073 ret = (!dst->ifindex || 1074 dst->ifindex == score->ifa->idev->dev->ifindex); 1075 break; 1076 case IPV6_SADDR_RULE_LABEL: 1077 /* Rule 6: Prefer matching label */ 1078 ret = ipv6_addr_label(net, 1079 &score->ifa->addr, score->addr_type, 1080 score->ifa->idev->dev->ifindex) == dst->label; 1081 break; 1082 #ifdef CONFIG_IPV6_PRIVACY 1083 case IPV6_SADDR_RULE_PRIVACY: 1084 { 1085 /* Rule 7: Prefer public address 1086 * Note: prefer temprary address if use_tempaddr >= 2 1087 */ 1088 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1089 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1090 score->ifa->idev->cnf.use_tempaddr >= 2; 1091 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1092 break; 1093 } 1094 #endif 1095 case IPV6_SADDR_RULE_ORCHID: 1096 /* Rule 8-: Prefer ORCHID vs ORCHID or 1097 * non-ORCHID vs non-ORCHID 1098 */ 1099 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1100 ipv6_addr_orchid(dst->addr)); 1101 break; 1102 case IPV6_SADDR_RULE_PREFIX: 1103 /* Rule 8: Use longest matching prefix */ 1104 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1105 dst->addr); 1106 break; 1107 default: 1108 ret = 0; 1109 } 1110 1111 if (ret) 1112 __set_bit(i, score->scorebits); 1113 score->rule = i; 1114 out: 1115 return ret; 1116 } 1117 1118 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1119 const struct in6_addr *daddr, unsigned int prefs, 1120 struct in6_addr *saddr) 1121 { 1122 struct ipv6_saddr_score scores[2], 1123 *score = &scores[0], *hiscore = &scores[1]; 1124 struct ipv6_saddr_dst dst; 1125 struct net_device *dev; 1126 int dst_type; 1127 1128 dst_type = __ipv6_addr_type(daddr); 1129 dst.addr = daddr; 1130 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1131 dst.scope = __ipv6_addr_src_scope(dst_type); 1132 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1133 dst.prefs = prefs; 1134 1135 hiscore->rule = -1; 1136 hiscore->ifa = NULL; 1137 1138 rcu_read_lock(); 1139 1140 for_each_netdev_rcu(net, dev) { 1141 struct inet6_dev *idev; 1142 1143 /* Candidate Source Address (section 4) 1144 * - multicast and link-local destination address, 1145 * the set of candidate source address MUST only 1146 * include addresses assigned to interfaces 1147 * belonging to the same link as the outgoing 1148 * interface. 1149 * (- For site-local destination addresses, the 1150 * set of candidate source addresses MUST only 1151 * include addresses assigned to interfaces 1152 * belonging to the same site as the outgoing 1153 * interface.) 1154 */ 1155 if (((dst_type & IPV6_ADDR_MULTICAST) || 1156 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1157 dst.ifindex && dev->ifindex != dst.ifindex) 1158 continue; 1159 1160 idev = __in6_dev_get(dev); 1161 if (!idev) 1162 continue; 1163 1164 read_lock_bh(&idev->lock); 1165 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1166 int i; 1167 1168 /* 1169 * - Tentative Address (RFC2462 section 5.4) 1170 * - A tentative address is not considered 1171 * "assigned to an interface" in the traditional 1172 * sense, unless it is also flagged as optimistic. 1173 * - Candidate Source Address (section 4) 1174 * - In any case, anycast addresses, multicast 1175 * addresses, and the unspecified address MUST 1176 * NOT be included in a candidate set. 1177 */ 1178 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1179 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1180 continue; 1181 1182 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1183 1184 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1185 score->addr_type & IPV6_ADDR_MULTICAST)) { 1186 LIMIT_NETDEBUG(KERN_DEBUG 1187 "ADDRCONF: unspecified / multicast address " 1188 "assigned as unicast address on %s", 1189 dev->name); 1190 continue; 1191 } 1192 1193 score->rule = -1; 1194 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1195 1196 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1197 int minihiscore, miniscore; 1198 1199 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1200 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1201 1202 if (minihiscore > miniscore) { 1203 if (i == IPV6_SADDR_RULE_SCOPE && 1204 score->scopedist > 0) { 1205 /* 1206 * special case: 1207 * each remaining entry 1208 * has too small (not enough) 1209 * scope, because ifa entries 1210 * are sorted by their scope 1211 * values. 1212 */ 1213 goto try_nextdev; 1214 } 1215 break; 1216 } else if (minihiscore < miniscore) { 1217 if (hiscore->ifa) 1218 in6_ifa_put(hiscore->ifa); 1219 1220 in6_ifa_hold(score->ifa); 1221 1222 swap(hiscore, score); 1223 1224 /* restore our iterator */ 1225 score->ifa = hiscore->ifa; 1226 1227 break; 1228 } 1229 } 1230 } 1231 try_nextdev: 1232 read_unlock_bh(&idev->lock); 1233 } 1234 rcu_read_unlock(); 1235 1236 if (!hiscore->ifa) 1237 return -EADDRNOTAVAIL; 1238 1239 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1240 in6_ifa_put(hiscore->ifa); 1241 return 0; 1242 } 1243 1244 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1245 1246 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1247 unsigned char banned_flags) 1248 { 1249 struct inet6_dev *idev; 1250 int err = -EADDRNOTAVAIL; 1251 1252 rcu_read_lock(); 1253 if ((idev = __in6_dev_get(dev)) != NULL) { 1254 struct inet6_ifaddr *ifp; 1255 1256 read_lock_bh(&idev->lock); 1257 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1258 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1259 ipv6_addr_copy(addr, &ifp->addr); 1260 err = 0; 1261 break; 1262 } 1263 } 1264 read_unlock_bh(&idev->lock); 1265 } 1266 rcu_read_unlock(); 1267 return err; 1268 } 1269 1270 static int ipv6_count_addresses(struct inet6_dev *idev) 1271 { 1272 int cnt = 0; 1273 struct inet6_ifaddr *ifp; 1274 1275 read_lock_bh(&idev->lock); 1276 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1277 cnt++; 1278 read_unlock_bh(&idev->lock); 1279 return cnt; 1280 } 1281 1282 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1283 struct net_device *dev, int strict) 1284 { 1285 struct inet6_ifaddr * ifp; 1286 u8 hash = ipv6_addr_hash(addr); 1287 1288 read_lock_bh(&addrconf_hash_lock); 1289 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1290 if (!net_eq(dev_net(ifp->idev->dev), net)) 1291 continue; 1292 if (ipv6_addr_equal(&ifp->addr, addr) && 1293 !(ifp->flags&IFA_F_TENTATIVE)) { 1294 if (dev == NULL || ifp->idev->dev == dev || 1295 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1296 break; 1297 } 1298 } 1299 read_unlock_bh(&addrconf_hash_lock); 1300 return ifp != NULL; 1301 } 1302 EXPORT_SYMBOL(ipv6_chk_addr); 1303 1304 static 1305 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1306 struct net_device *dev) 1307 { 1308 struct inet6_ifaddr * ifp; 1309 u8 hash = ipv6_addr_hash(addr); 1310 1311 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1312 if (!net_eq(dev_net(ifp->idev->dev), net)) 1313 continue; 1314 if (ipv6_addr_equal(&ifp->addr, addr)) { 1315 if (dev == NULL || ifp->idev->dev == dev) 1316 break; 1317 } 1318 } 1319 return ifp != NULL; 1320 } 1321 1322 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1323 { 1324 struct inet6_dev *idev; 1325 struct inet6_ifaddr *ifa; 1326 int onlink; 1327 1328 onlink = 0; 1329 rcu_read_lock(); 1330 idev = __in6_dev_get(dev); 1331 if (idev) { 1332 read_lock_bh(&idev->lock); 1333 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1334 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1335 ifa->prefix_len); 1336 if (onlink) 1337 break; 1338 } 1339 read_unlock_bh(&idev->lock); 1340 } 1341 rcu_read_unlock(); 1342 return onlink; 1343 } 1344 1345 EXPORT_SYMBOL(ipv6_chk_prefix); 1346 1347 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1348 struct net_device *dev, int strict) 1349 { 1350 struct inet6_ifaddr * ifp; 1351 u8 hash = ipv6_addr_hash(addr); 1352 1353 read_lock_bh(&addrconf_hash_lock); 1354 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1355 if (!net_eq(dev_net(ifp->idev->dev), net)) 1356 continue; 1357 if (ipv6_addr_equal(&ifp->addr, addr)) { 1358 if (dev == NULL || ifp->idev->dev == dev || 1359 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1360 in6_ifa_hold(ifp); 1361 break; 1362 } 1363 } 1364 } 1365 read_unlock_bh(&addrconf_hash_lock); 1366 1367 return ifp; 1368 } 1369 1370 /* Gets referenced address, destroys ifaddr */ 1371 1372 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1373 { 1374 if (ifp->flags&IFA_F_PERMANENT) { 1375 spin_lock_bh(&ifp->lock); 1376 addrconf_del_timer(ifp); 1377 ifp->flags |= IFA_F_TENTATIVE; 1378 if (dad_failed) 1379 ifp->flags |= IFA_F_DADFAILED; 1380 spin_unlock_bh(&ifp->lock); 1381 in6_ifa_put(ifp); 1382 #ifdef CONFIG_IPV6_PRIVACY 1383 } else if (ifp->flags&IFA_F_TEMPORARY) { 1384 struct inet6_ifaddr *ifpub; 1385 spin_lock_bh(&ifp->lock); 1386 ifpub = ifp->ifpub; 1387 if (ifpub) { 1388 in6_ifa_hold(ifpub); 1389 spin_unlock_bh(&ifp->lock); 1390 ipv6_create_tempaddr(ifpub, ifp); 1391 in6_ifa_put(ifpub); 1392 } else { 1393 spin_unlock_bh(&ifp->lock); 1394 } 1395 ipv6_del_addr(ifp); 1396 #endif 1397 } else 1398 ipv6_del_addr(ifp); 1399 } 1400 1401 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1402 { 1403 struct inet6_dev *idev = ifp->idev; 1404 1405 if (net_ratelimit()) 1406 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1407 ifp->idev->dev->name, &ifp->addr); 1408 1409 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1410 struct in6_addr addr; 1411 1412 addr.s6_addr32[0] = htonl(0xfe800000); 1413 addr.s6_addr32[1] = 0; 1414 1415 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1416 ipv6_addr_equal(&ifp->addr, &addr)) { 1417 /* DAD failed for link-local based on MAC address */ 1418 idev->cnf.disable_ipv6 = 1; 1419 1420 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1421 ifp->idev->dev->name); 1422 } 1423 } 1424 1425 addrconf_dad_stop(ifp, 1); 1426 } 1427 1428 /* Join to solicited addr multicast group. */ 1429 1430 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1431 { 1432 struct in6_addr maddr; 1433 1434 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1435 return; 1436 1437 addrconf_addr_solict_mult(addr, &maddr); 1438 ipv6_dev_mc_inc(dev, &maddr); 1439 } 1440 1441 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1442 { 1443 struct in6_addr maddr; 1444 1445 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1446 return; 1447 1448 addrconf_addr_solict_mult(addr, &maddr); 1449 __ipv6_dev_mc_dec(idev, &maddr); 1450 } 1451 1452 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1453 { 1454 struct in6_addr addr; 1455 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1456 if (ipv6_addr_any(&addr)) 1457 return; 1458 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1459 } 1460 1461 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1462 { 1463 struct in6_addr addr; 1464 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1465 if (ipv6_addr_any(&addr)) 1466 return; 1467 __ipv6_dev_ac_dec(ifp->idev, &addr); 1468 } 1469 1470 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1471 { 1472 if (dev->addr_len != ETH_ALEN) 1473 return -1; 1474 memcpy(eui, dev->dev_addr, 3); 1475 memcpy(eui + 5, dev->dev_addr + 3, 3); 1476 1477 /* 1478 * The zSeries OSA network cards can be shared among various 1479 * OS instances, but the OSA cards have only one MAC address. 1480 * This leads to duplicate address conflicts in conjunction 1481 * with IPv6 if more than one instance uses the same card. 1482 * 1483 * The driver for these cards can deliver a unique 16-bit 1484 * identifier for each instance sharing the same card. It is 1485 * placed instead of 0xFFFE in the interface identifier. The 1486 * "u" bit of the interface identifier is not inverted in this 1487 * case. Hence the resulting interface identifier has local 1488 * scope according to RFC2373. 1489 */ 1490 if (dev->dev_id) { 1491 eui[3] = (dev->dev_id >> 8) & 0xFF; 1492 eui[4] = dev->dev_id & 0xFF; 1493 } else { 1494 eui[3] = 0xFF; 1495 eui[4] = 0xFE; 1496 eui[0] ^= 2; 1497 } 1498 return 0; 1499 } 1500 1501 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1502 { 1503 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1504 if (dev->addr_len != ARCNET_ALEN) 1505 return -1; 1506 memset(eui, 0, 7); 1507 eui[7] = *(u8*)dev->dev_addr; 1508 return 0; 1509 } 1510 1511 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1512 { 1513 if (dev->addr_len != INFINIBAND_ALEN) 1514 return -1; 1515 memcpy(eui, dev->dev_addr + 12, 8); 1516 eui[0] |= 2; 1517 return 0; 1518 } 1519 1520 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1521 { 1522 if (addr == 0) 1523 return -1; 1524 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1525 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1526 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1527 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1528 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1529 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1530 eui[1] = 0; 1531 eui[2] = 0x5E; 1532 eui[3] = 0xFE; 1533 memcpy(eui + 4, &addr, 4); 1534 return 0; 1535 } 1536 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1537 1538 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1539 { 1540 if (dev->priv_flags & IFF_ISATAP) 1541 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1542 return -1; 1543 } 1544 1545 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1546 { 1547 switch (dev->type) { 1548 case ARPHRD_ETHER: 1549 case ARPHRD_FDDI: 1550 case ARPHRD_IEEE802_TR: 1551 return addrconf_ifid_eui48(eui, dev); 1552 case ARPHRD_ARCNET: 1553 return addrconf_ifid_arcnet(eui, dev); 1554 case ARPHRD_INFINIBAND: 1555 return addrconf_ifid_infiniband(eui, dev); 1556 case ARPHRD_SIT: 1557 return addrconf_ifid_sit(eui, dev); 1558 } 1559 return -1; 1560 } 1561 1562 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1563 { 1564 int err = -1; 1565 struct inet6_ifaddr *ifp; 1566 1567 read_lock_bh(&idev->lock); 1568 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1569 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1570 memcpy(eui, ifp->addr.s6_addr+8, 8); 1571 err = 0; 1572 break; 1573 } 1574 } 1575 read_unlock_bh(&idev->lock); 1576 return err; 1577 } 1578 1579 #ifdef CONFIG_IPV6_PRIVACY 1580 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1581 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1582 { 1583 regen: 1584 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1585 idev->rndid[0] &= ~0x02; 1586 1587 /* 1588 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1589 * check if generated address is not inappropriate 1590 * 1591 * - Reserved subnet anycast (RFC 2526) 1592 * 11111101 11....11 1xxxxxxx 1593 * - ISATAP (RFC4214) 6.1 1594 * 00-00-5E-FE-xx-xx-xx-xx 1595 * - value 0 1596 * - XXX: already assigned to an address on the device 1597 */ 1598 if (idev->rndid[0] == 0xfd && 1599 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1600 (idev->rndid[7]&0x80)) 1601 goto regen; 1602 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1603 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1604 goto regen; 1605 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1606 goto regen; 1607 } 1608 1609 return 0; 1610 } 1611 1612 static void ipv6_regen_rndid(unsigned long data) 1613 { 1614 struct inet6_dev *idev = (struct inet6_dev *) data; 1615 unsigned long expires; 1616 1617 rcu_read_lock_bh(); 1618 write_lock_bh(&idev->lock); 1619 1620 if (idev->dead) 1621 goto out; 1622 1623 if (__ipv6_regen_rndid(idev) < 0) 1624 goto out; 1625 1626 expires = jiffies + 1627 idev->cnf.temp_prefered_lft * HZ - 1628 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1629 if (time_before(expires, jiffies)) { 1630 printk(KERN_WARNING 1631 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1632 idev->dev->name); 1633 goto out; 1634 } 1635 1636 if (!mod_timer(&idev->regen_timer, expires)) 1637 in6_dev_hold(idev); 1638 1639 out: 1640 write_unlock_bh(&idev->lock); 1641 rcu_read_unlock_bh(); 1642 in6_dev_put(idev); 1643 } 1644 1645 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1646 int ret = 0; 1647 1648 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1649 ret = __ipv6_regen_rndid(idev); 1650 return ret; 1651 } 1652 #endif 1653 1654 /* 1655 * Add prefix route. 1656 */ 1657 1658 static void 1659 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1660 unsigned long expires, u32 flags) 1661 { 1662 struct fib6_config cfg = { 1663 .fc_table = RT6_TABLE_PREFIX, 1664 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1665 .fc_ifindex = dev->ifindex, 1666 .fc_expires = expires, 1667 .fc_dst_len = plen, 1668 .fc_flags = RTF_UP | flags, 1669 .fc_nlinfo.nl_net = dev_net(dev), 1670 .fc_protocol = RTPROT_KERNEL, 1671 }; 1672 1673 ipv6_addr_copy(&cfg.fc_dst, pfx); 1674 1675 /* Prevent useless cloning on PtP SIT. 1676 This thing is done here expecting that the whole 1677 class of non-broadcast devices need not cloning. 1678 */ 1679 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1680 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1681 cfg.fc_flags |= RTF_NONEXTHOP; 1682 #endif 1683 1684 ip6_route_add(&cfg); 1685 } 1686 1687 /* Create "default" multicast route to the interface */ 1688 1689 static void addrconf_add_mroute(struct net_device *dev) 1690 { 1691 struct fib6_config cfg = { 1692 .fc_table = RT6_TABLE_LOCAL, 1693 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1694 .fc_ifindex = dev->ifindex, 1695 .fc_dst_len = 8, 1696 .fc_flags = RTF_UP, 1697 .fc_nlinfo.nl_net = dev_net(dev), 1698 }; 1699 1700 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1701 1702 ip6_route_add(&cfg); 1703 } 1704 1705 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1706 static void sit_route_add(struct net_device *dev) 1707 { 1708 struct fib6_config cfg = { 1709 .fc_table = RT6_TABLE_MAIN, 1710 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1711 .fc_ifindex = dev->ifindex, 1712 .fc_dst_len = 96, 1713 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1714 .fc_nlinfo.nl_net = dev_net(dev), 1715 }; 1716 1717 /* prefix length - 96 bits "::d.d.d.d" */ 1718 ip6_route_add(&cfg); 1719 } 1720 #endif 1721 1722 static void addrconf_add_lroute(struct net_device *dev) 1723 { 1724 struct in6_addr addr; 1725 1726 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1727 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1728 } 1729 1730 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1731 { 1732 struct inet6_dev *idev; 1733 1734 ASSERT_RTNL(); 1735 1736 if ((idev = ipv6_find_idev(dev)) == NULL) 1737 return NULL; 1738 1739 /* Add default multicast route */ 1740 addrconf_add_mroute(dev); 1741 1742 /* Add link local route */ 1743 addrconf_add_lroute(dev); 1744 return idev; 1745 } 1746 1747 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1748 { 1749 struct prefix_info *pinfo; 1750 __u32 valid_lft; 1751 __u32 prefered_lft; 1752 int addr_type; 1753 struct inet6_dev *in6_dev; 1754 struct net *net = dev_net(dev); 1755 1756 pinfo = (struct prefix_info *) opt; 1757 1758 if (len < sizeof(struct prefix_info)) { 1759 ADBG(("addrconf: prefix option too short\n")); 1760 return; 1761 } 1762 1763 /* 1764 * Validation checks ([ADDRCONF], page 19) 1765 */ 1766 1767 addr_type = ipv6_addr_type(&pinfo->prefix); 1768 1769 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1770 return; 1771 1772 valid_lft = ntohl(pinfo->valid); 1773 prefered_lft = ntohl(pinfo->prefered); 1774 1775 if (prefered_lft > valid_lft) { 1776 if (net_ratelimit()) 1777 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1778 return; 1779 } 1780 1781 in6_dev = in6_dev_get(dev); 1782 1783 if (in6_dev == NULL) { 1784 if (net_ratelimit()) 1785 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1786 return; 1787 } 1788 1789 /* 1790 * Two things going on here: 1791 * 1) Add routes for on-link prefixes 1792 * 2) Configure prefixes with the auto flag set 1793 */ 1794 1795 if (pinfo->onlink) { 1796 struct rt6_info *rt; 1797 unsigned long rt_expires; 1798 1799 /* Avoid arithmetic overflow. Really, we could 1800 * save rt_expires in seconds, likely valid_lft, 1801 * but it would require division in fib gc, that it 1802 * not good. 1803 */ 1804 if (HZ > USER_HZ) 1805 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1806 else 1807 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1808 1809 if (addrconf_finite_timeout(rt_expires)) 1810 rt_expires *= HZ; 1811 1812 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1813 dev->ifindex, 1); 1814 1815 if (rt && addrconf_is_prefix_route(rt)) { 1816 /* Autoconf prefix route */ 1817 if (valid_lft == 0) { 1818 ip6_del_rt(rt); 1819 rt = NULL; 1820 } else if (addrconf_finite_timeout(rt_expires)) { 1821 /* not infinity */ 1822 rt->rt6i_expires = jiffies + rt_expires; 1823 rt->rt6i_flags |= RTF_EXPIRES; 1824 } else { 1825 rt->rt6i_flags &= ~RTF_EXPIRES; 1826 rt->rt6i_expires = 0; 1827 } 1828 } else if (valid_lft) { 1829 clock_t expires = 0; 1830 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1831 if (addrconf_finite_timeout(rt_expires)) { 1832 /* not infinity */ 1833 flags |= RTF_EXPIRES; 1834 expires = jiffies_to_clock_t(rt_expires); 1835 } 1836 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1837 dev, expires, flags); 1838 } 1839 if (rt) 1840 dst_release(&rt->u.dst); 1841 } 1842 1843 /* Try to figure out our local address for this prefix */ 1844 1845 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1846 struct inet6_ifaddr * ifp; 1847 struct in6_addr addr; 1848 int create = 0, update_lft = 0; 1849 1850 if (pinfo->prefix_len == 64) { 1851 memcpy(&addr, &pinfo->prefix, 8); 1852 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1853 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1854 in6_dev_put(in6_dev); 1855 return; 1856 } 1857 goto ok; 1858 } 1859 if (net_ratelimit()) 1860 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1861 pinfo->prefix_len); 1862 in6_dev_put(in6_dev); 1863 return; 1864 1865 ok: 1866 1867 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1868 1869 if (ifp == NULL && valid_lft) { 1870 int max_addresses = in6_dev->cnf.max_addresses; 1871 u32 addr_flags = 0; 1872 1873 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1874 if (in6_dev->cnf.optimistic_dad && 1875 !net->ipv6.devconf_all->forwarding) 1876 addr_flags = IFA_F_OPTIMISTIC; 1877 #endif 1878 1879 /* Do not allow to create too much of autoconfigured 1880 * addresses; this would be too easy way to crash kernel. 1881 */ 1882 if (!max_addresses || 1883 ipv6_count_addresses(in6_dev) < max_addresses) 1884 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1885 addr_type&IPV6_ADDR_SCOPE_MASK, 1886 addr_flags); 1887 1888 if (!ifp || IS_ERR(ifp)) { 1889 in6_dev_put(in6_dev); 1890 return; 1891 } 1892 1893 update_lft = create = 1; 1894 ifp->cstamp = jiffies; 1895 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1896 } 1897 1898 if (ifp) { 1899 int flags; 1900 unsigned long now; 1901 #ifdef CONFIG_IPV6_PRIVACY 1902 struct inet6_ifaddr *ift; 1903 #endif 1904 u32 stored_lft; 1905 1906 /* update lifetime (RFC2462 5.5.3 e) */ 1907 spin_lock(&ifp->lock); 1908 now = jiffies; 1909 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1910 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1911 else 1912 stored_lft = 0; 1913 if (!update_lft && stored_lft) { 1914 if (valid_lft > MIN_VALID_LIFETIME || 1915 valid_lft > stored_lft) 1916 update_lft = 1; 1917 else if (stored_lft <= MIN_VALID_LIFETIME) { 1918 /* valid_lft <= stored_lft is always true */ 1919 /* 1920 * RFC 4862 Section 5.5.3e: 1921 * "Note that the preferred lifetime of 1922 * the corresponding address is always 1923 * reset to the Preferred Lifetime in 1924 * the received Prefix Information 1925 * option, regardless of whether the 1926 * valid lifetime is also reset or 1927 * ignored." 1928 * 1929 * So if the preferred lifetime in 1930 * this advertisement is different 1931 * than what we have stored, but the 1932 * valid lifetime is invalid, just 1933 * reset prefered_lft. 1934 * 1935 * We must set the valid lifetime 1936 * to the stored lifetime since we'll 1937 * be updating the timestamp below, 1938 * else we'll set it back to the 1939 * minumum. 1940 */ 1941 if (prefered_lft != ifp->prefered_lft) { 1942 valid_lft = stored_lft; 1943 update_lft = 1; 1944 } 1945 } else { 1946 valid_lft = MIN_VALID_LIFETIME; 1947 if (valid_lft < prefered_lft) 1948 prefered_lft = valid_lft; 1949 update_lft = 1; 1950 } 1951 } 1952 1953 if (update_lft) { 1954 ifp->valid_lft = valid_lft; 1955 ifp->prefered_lft = prefered_lft; 1956 ifp->tstamp = now; 1957 flags = ifp->flags; 1958 ifp->flags &= ~IFA_F_DEPRECATED; 1959 spin_unlock(&ifp->lock); 1960 1961 if (!(flags&IFA_F_TENTATIVE)) 1962 ipv6_ifa_notify(0, ifp); 1963 } else 1964 spin_unlock(&ifp->lock); 1965 1966 #ifdef CONFIG_IPV6_PRIVACY 1967 read_lock_bh(&in6_dev->lock); 1968 /* update all temporary addresses in the list */ 1969 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1970 /* 1971 * When adjusting the lifetimes of an existing 1972 * temporary address, only lower the lifetimes. 1973 * Implementations must not increase the 1974 * lifetimes of an existing temporary address 1975 * when processing a Prefix Information Option. 1976 */ 1977 if (ifp != ift->ifpub) 1978 continue; 1979 1980 spin_lock(&ift->lock); 1981 flags = ift->flags; 1982 if (ift->valid_lft > valid_lft && 1983 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1984 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1985 if (ift->prefered_lft > prefered_lft && 1986 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1987 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1988 spin_unlock(&ift->lock); 1989 if (!(flags&IFA_F_TENTATIVE)) 1990 ipv6_ifa_notify(0, ift); 1991 } 1992 1993 if (create && in6_dev->cnf.use_tempaddr > 0) { 1994 /* 1995 * When a new public address is created as described in [ADDRCONF], 1996 * also create a new temporary address. 1997 */ 1998 read_unlock_bh(&in6_dev->lock); 1999 ipv6_create_tempaddr(ifp, NULL); 2000 } else { 2001 read_unlock_bh(&in6_dev->lock); 2002 } 2003 #endif 2004 in6_ifa_put(ifp); 2005 addrconf_verify(0); 2006 } 2007 } 2008 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2009 in6_dev_put(in6_dev); 2010 } 2011 2012 /* 2013 * Set destination address. 2014 * Special case for SIT interfaces where we create a new "virtual" 2015 * device. 2016 */ 2017 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2018 { 2019 struct in6_ifreq ireq; 2020 struct net_device *dev; 2021 int err = -EINVAL; 2022 2023 rtnl_lock(); 2024 2025 err = -EFAULT; 2026 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2027 goto err_exit; 2028 2029 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2030 2031 err = -ENODEV; 2032 if (dev == NULL) 2033 goto err_exit; 2034 2035 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2036 if (dev->type == ARPHRD_SIT) { 2037 const struct net_device_ops *ops = dev->netdev_ops; 2038 struct ifreq ifr; 2039 struct ip_tunnel_parm p; 2040 2041 err = -EADDRNOTAVAIL; 2042 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2043 goto err_exit; 2044 2045 memset(&p, 0, sizeof(p)); 2046 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2047 p.iph.saddr = 0; 2048 p.iph.version = 4; 2049 p.iph.ihl = 5; 2050 p.iph.protocol = IPPROTO_IPV6; 2051 p.iph.ttl = 64; 2052 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2053 2054 if (ops->ndo_do_ioctl) { 2055 mm_segment_t oldfs = get_fs(); 2056 2057 set_fs(KERNEL_DS); 2058 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2059 set_fs(oldfs); 2060 } else 2061 err = -EOPNOTSUPP; 2062 2063 if (err == 0) { 2064 err = -ENOBUFS; 2065 dev = __dev_get_by_name(net, p.name); 2066 if (!dev) 2067 goto err_exit; 2068 err = dev_open(dev); 2069 } 2070 } 2071 #endif 2072 2073 err_exit: 2074 rtnl_unlock(); 2075 return err; 2076 } 2077 2078 /* 2079 * Manual configuration of address on an interface 2080 */ 2081 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2082 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2083 __u32 valid_lft) 2084 { 2085 struct inet6_ifaddr *ifp; 2086 struct inet6_dev *idev; 2087 struct net_device *dev; 2088 int scope; 2089 u32 flags; 2090 clock_t expires; 2091 unsigned long timeout; 2092 2093 ASSERT_RTNL(); 2094 2095 if (plen > 128) 2096 return -EINVAL; 2097 2098 /* check the lifetime */ 2099 if (!valid_lft || prefered_lft > valid_lft) 2100 return -EINVAL; 2101 2102 dev = __dev_get_by_index(net, ifindex); 2103 if (!dev) 2104 return -ENODEV; 2105 2106 if ((idev = addrconf_add_dev(dev)) == NULL) 2107 return -ENOBUFS; 2108 2109 scope = ipv6_addr_scope(pfx); 2110 2111 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2112 if (addrconf_finite_timeout(timeout)) { 2113 expires = jiffies_to_clock_t(timeout * HZ); 2114 valid_lft = timeout; 2115 flags = RTF_EXPIRES; 2116 } else { 2117 expires = 0; 2118 flags = 0; 2119 ifa_flags |= IFA_F_PERMANENT; 2120 } 2121 2122 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2123 if (addrconf_finite_timeout(timeout)) { 2124 if (timeout == 0) 2125 ifa_flags |= IFA_F_DEPRECATED; 2126 prefered_lft = timeout; 2127 } 2128 2129 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2130 2131 if (!IS_ERR(ifp)) { 2132 spin_lock_bh(&ifp->lock); 2133 ifp->valid_lft = valid_lft; 2134 ifp->prefered_lft = prefered_lft; 2135 ifp->tstamp = jiffies; 2136 spin_unlock_bh(&ifp->lock); 2137 2138 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2139 expires, flags); 2140 /* 2141 * Note that section 3.1 of RFC 4429 indicates 2142 * that the Optimistic flag should not be set for 2143 * manually configured addresses 2144 */ 2145 addrconf_dad_start(ifp, 0); 2146 in6_ifa_put(ifp); 2147 addrconf_verify(0); 2148 return 0; 2149 } 2150 2151 return PTR_ERR(ifp); 2152 } 2153 2154 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2155 unsigned int plen) 2156 { 2157 struct inet6_ifaddr *ifp; 2158 struct inet6_dev *idev; 2159 struct net_device *dev; 2160 2161 if (plen > 128) 2162 return -EINVAL; 2163 2164 dev = __dev_get_by_index(net, ifindex); 2165 if (!dev) 2166 return -ENODEV; 2167 2168 if ((idev = __in6_dev_get(dev)) == NULL) 2169 return -ENXIO; 2170 2171 read_lock_bh(&idev->lock); 2172 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2173 if (ifp->prefix_len == plen && 2174 ipv6_addr_equal(pfx, &ifp->addr)) { 2175 in6_ifa_hold(ifp); 2176 read_unlock_bh(&idev->lock); 2177 2178 ipv6_del_addr(ifp); 2179 2180 /* If the last address is deleted administratively, 2181 disable IPv6 on this interface. 2182 */ 2183 if (idev->addr_list == NULL) 2184 addrconf_ifdown(idev->dev, 1); 2185 return 0; 2186 } 2187 } 2188 read_unlock_bh(&idev->lock); 2189 return -EADDRNOTAVAIL; 2190 } 2191 2192 2193 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2194 { 2195 struct in6_ifreq ireq; 2196 int err; 2197 2198 if (!capable(CAP_NET_ADMIN)) 2199 return -EPERM; 2200 2201 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2202 return -EFAULT; 2203 2204 rtnl_lock(); 2205 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2206 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2207 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2208 rtnl_unlock(); 2209 return err; 2210 } 2211 2212 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2213 { 2214 struct in6_ifreq ireq; 2215 int err; 2216 2217 if (!capable(CAP_NET_ADMIN)) 2218 return -EPERM; 2219 2220 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2221 return -EFAULT; 2222 2223 rtnl_lock(); 2224 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2225 ireq.ifr6_prefixlen); 2226 rtnl_unlock(); 2227 return err; 2228 } 2229 2230 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2231 int plen, int scope) 2232 { 2233 struct inet6_ifaddr *ifp; 2234 2235 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2236 if (!IS_ERR(ifp)) { 2237 spin_lock_bh(&ifp->lock); 2238 ifp->flags &= ~IFA_F_TENTATIVE; 2239 spin_unlock_bh(&ifp->lock); 2240 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2241 in6_ifa_put(ifp); 2242 } 2243 } 2244 2245 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2246 static void sit_add_v4_addrs(struct inet6_dev *idev) 2247 { 2248 struct in6_addr addr; 2249 struct net_device *dev; 2250 struct net *net = dev_net(idev->dev); 2251 int scope; 2252 2253 ASSERT_RTNL(); 2254 2255 memset(&addr, 0, sizeof(struct in6_addr)); 2256 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2257 2258 if (idev->dev->flags&IFF_POINTOPOINT) { 2259 addr.s6_addr32[0] = htonl(0xfe800000); 2260 scope = IFA_LINK; 2261 } else { 2262 scope = IPV6_ADDR_COMPATv4; 2263 } 2264 2265 if (addr.s6_addr32[3]) { 2266 add_addr(idev, &addr, 128, scope); 2267 return; 2268 } 2269 2270 for_each_netdev(net, dev) { 2271 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2272 if (in_dev && (dev->flags & IFF_UP)) { 2273 struct in_ifaddr * ifa; 2274 2275 int flag = scope; 2276 2277 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2278 int plen; 2279 2280 addr.s6_addr32[3] = ifa->ifa_local; 2281 2282 if (ifa->ifa_scope == RT_SCOPE_LINK) 2283 continue; 2284 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2285 if (idev->dev->flags&IFF_POINTOPOINT) 2286 continue; 2287 flag |= IFA_HOST; 2288 } 2289 if (idev->dev->flags&IFF_POINTOPOINT) 2290 plen = 64; 2291 else 2292 plen = 96; 2293 2294 add_addr(idev, &addr, plen, flag); 2295 } 2296 } 2297 } 2298 } 2299 #endif 2300 2301 static void init_loopback(struct net_device *dev) 2302 { 2303 struct inet6_dev *idev; 2304 2305 /* ::1 */ 2306 2307 ASSERT_RTNL(); 2308 2309 if ((idev = ipv6_find_idev(dev)) == NULL) { 2310 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2311 return; 2312 } 2313 2314 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2315 } 2316 2317 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2318 { 2319 struct inet6_ifaddr * ifp; 2320 u32 addr_flags = IFA_F_PERMANENT; 2321 2322 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2323 if (idev->cnf.optimistic_dad && 2324 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2325 addr_flags |= IFA_F_OPTIMISTIC; 2326 #endif 2327 2328 2329 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2330 if (!IS_ERR(ifp)) { 2331 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2332 addrconf_dad_start(ifp, 0); 2333 in6_ifa_put(ifp); 2334 } 2335 } 2336 2337 static void addrconf_dev_config(struct net_device *dev) 2338 { 2339 struct in6_addr addr; 2340 struct inet6_dev * idev; 2341 2342 ASSERT_RTNL(); 2343 2344 if ((dev->type != ARPHRD_ETHER) && 2345 (dev->type != ARPHRD_FDDI) && 2346 (dev->type != ARPHRD_IEEE802_TR) && 2347 (dev->type != ARPHRD_ARCNET) && 2348 (dev->type != ARPHRD_INFINIBAND)) { 2349 /* Alas, we support only Ethernet autoconfiguration. */ 2350 return; 2351 } 2352 2353 idev = addrconf_add_dev(dev); 2354 if (idev == NULL) 2355 return; 2356 2357 memset(&addr, 0, sizeof(struct in6_addr)); 2358 addr.s6_addr32[0] = htonl(0xFE800000); 2359 2360 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2361 addrconf_add_linklocal(idev, &addr); 2362 } 2363 2364 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2365 static void addrconf_sit_config(struct net_device *dev) 2366 { 2367 struct inet6_dev *idev; 2368 2369 ASSERT_RTNL(); 2370 2371 /* 2372 * Configure the tunnel with one of our IPv4 2373 * addresses... we should configure all of 2374 * our v4 addrs in the tunnel 2375 */ 2376 2377 if ((idev = ipv6_find_idev(dev)) == NULL) { 2378 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2379 return; 2380 } 2381 2382 if (dev->priv_flags & IFF_ISATAP) { 2383 struct in6_addr addr; 2384 2385 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2386 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2387 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2388 addrconf_add_linklocal(idev, &addr); 2389 return; 2390 } 2391 2392 sit_add_v4_addrs(idev); 2393 2394 if (dev->flags&IFF_POINTOPOINT) { 2395 addrconf_add_mroute(dev); 2396 addrconf_add_lroute(dev); 2397 } else 2398 sit_route_add(dev); 2399 } 2400 #endif 2401 2402 static inline int 2403 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2404 { 2405 struct in6_addr lladdr; 2406 2407 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2408 addrconf_add_linklocal(idev, &lladdr); 2409 return 0; 2410 } 2411 return -1; 2412 } 2413 2414 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2415 { 2416 struct net_device *link_dev; 2417 struct net *net = dev_net(idev->dev); 2418 2419 /* first try to inherit the link-local address from the link device */ 2420 if (idev->dev->iflink && 2421 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2422 if (!ipv6_inherit_linklocal(idev, link_dev)) 2423 return; 2424 } 2425 /* then try to inherit it from any device */ 2426 for_each_netdev(net, link_dev) { 2427 if (!ipv6_inherit_linklocal(idev, link_dev)) 2428 return; 2429 } 2430 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2431 } 2432 2433 /* 2434 * Autoconfigure tunnel with a link-local address so routing protocols, 2435 * DHCPv6, MLD etc. can be run over the virtual link 2436 */ 2437 2438 static void addrconf_ip6_tnl_config(struct net_device *dev) 2439 { 2440 struct inet6_dev *idev; 2441 2442 ASSERT_RTNL(); 2443 2444 if ((idev = addrconf_add_dev(dev)) == NULL) { 2445 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2446 return; 2447 } 2448 ip6_tnl_add_linklocal(idev); 2449 } 2450 2451 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2452 void * data) 2453 { 2454 struct net_device *dev = (struct net_device *) data; 2455 struct inet6_dev *idev = __in6_dev_get(dev); 2456 int run_pending = 0; 2457 int err; 2458 2459 switch(event) { 2460 case NETDEV_REGISTER: 2461 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2462 idev = ipv6_add_dev(dev); 2463 if (!idev) 2464 return notifier_from_errno(-ENOMEM); 2465 } 2466 break; 2467 case NETDEV_UP: 2468 case NETDEV_CHANGE: 2469 if (dev->flags & IFF_SLAVE) 2470 break; 2471 2472 if (event == NETDEV_UP) { 2473 if (!addrconf_qdisc_ok(dev)) { 2474 /* device is not ready yet. */ 2475 printk(KERN_INFO 2476 "ADDRCONF(NETDEV_UP): %s: " 2477 "link is not ready\n", 2478 dev->name); 2479 break; 2480 } 2481 2482 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2483 idev = ipv6_add_dev(dev); 2484 2485 if (idev) { 2486 idev->if_flags |= IF_READY; 2487 run_pending = 1; 2488 } 2489 } else { 2490 if (!addrconf_qdisc_ok(dev)) { 2491 /* device is still not ready. */ 2492 break; 2493 } 2494 2495 if (idev) { 2496 if (idev->if_flags & IF_READY) { 2497 /* device is already configured. */ 2498 break; 2499 } 2500 idev->if_flags |= IF_READY; 2501 } 2502 2503 printk(KERN_INFO 2504 "ADDRCONF(NETDEV_CHANGE): %s: " 2505 "link becomes ready\n", 2506 dev->name); 2507 2508 run_pending = 1; 2509 } 2510 2511 switch(dev->type) { 2512 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2513 case ARPHRD_SIT: 2514 addrconf_sit_config(dev); 2515 break; 2516 #endif 2517 case ARPHRD_TUNNEL6: 2518 addrconf_ip6_tnl_config(dev); 2519 break; 2520 case ARPHRD_LOOPBACK: 2521 init_loopback(dev); 2522 break; 2523 2524 default: 2525 addrconf_dev_config(dev); 2526 break; 2527 } 2528 if (idev) { 2529 if (run_pending) 2530 addrconf_dad_run(idev); 2531 2532 /* If the MTU changed during the interface down, when the 2533 interface up, the changed MTU must be reflected in the 2534 idev as well as routers. 2535 */ 2536 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2537 rt6_mtu_change(dev, dev->mtu); 2538 idev->cnf.mtu6 = dev->mtu; 2539 } 2540 idev->tstamp = jiffies; 2541 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2542 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2543 stop IPv6 on this interface. 2544 */ 2545 if (dev->mtu < IPV6_MIN_MTU) 2546 addrconf_ifdown(dev, event != NETDEV_DOWN); 2547 } 2548 break; 2549 2550 case NETDEV_CHANGEMTU: 2551 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2552 rt6_mtu_change(dev, dev->mtu); 2553 idev->cnf.mtu6 = dev->mtu; 2554 break; 2555 } 2556 2557 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2558 idev = ipv6_add_dev(dev); 2559 if (idev) 2560 break; 2561 } 2562 2563 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2564 2565 case NETDEV_DOWN: 2566 case NETDEV_UNREGISTER: 2567 /* 2568 * Remove all addresses from this interface. 2569 */ 2570 addrconf_ifdown(dev, event != NETDEV_DOWN); 2571 break; 2572 2573 case NETDEV_CHANGENAME: 2574 if (idev) { 2575 snmp6_unregister_dev(idev); 2576 addrconf_sysctl_unregister(idev); 2577 addrconf_sysctl_register(idev); 2578 err = snmp6_register_dev(idev); 2579 if (err) 2580 return notifier_from_errno(err); 2581 } 2582 break; 2583 case NETDEV_BONDING_OLDTYPE: 2584 case NETDEV_BONDING_NEWTYPE: 2585 addrconf_bonding_change(dev, event); 2586 break; 2587 } 2588 2589 return NOTIFY_OK; 2590 } 2591 2592 /* 2593 * addrconf module should be notified of a device going up 2594 */ 2595 static struct notifier_block ipv6_dev_notf = { 2596 .notifier_call = addrconf_notify, 2597 .priority = 0 2598 }; 2599 2600 static void addrconf_bonding_change(struct net_device *dev, unsigned long event) 2601 { 2602 struct inet6_dev *idev; 2603 ASSERT_RTNL(); 2604 2605 idev = __in6_dev_get(dev); 2606 2607 if (event == NETDEV_BONDING_NEWTYPE) 2608 ipv6_mc_remap(idev); 2609 else if (event == NETDEV_BONDING_OLDTYPE) 2610 ipv6_mc_unmap(idev); 2611 } 2612 2613 static int addrconf_ifdown(struct net_device *dev, int how) 2614 { 2615 struct inet6_dev *idev; 2616 struct inet6_ifaddr *ifa, **bifa; 2617 struct net *net = dev_net(dev); 2618 int i; 2619 2620 ASSERT_RTNL(); 2621 2622 rt6_ifdown(net, dev); 2623 neigh_ifdown(&nd_tbl, dev); 2624 2625 idev = __in6_dev_get(dev); 2626 if (idev == NULL) 2627 return -ENODEV; 2628 2629 /* Step 1: remove reference to ipv6 device from parent device. 2630 Do not dev_put! 2631 */ 2632 if (how) { 2633 idev->dead = 1; 2634 2635 /* protected by rtnl_lock */ 2636 rcu_assign_pointer(dev->ip6_ptr, NULL); 2637 2638 /* Step 1.5: remove snmp6 entry */ 2639 snmp6_unregister_dev(idev); 2640 2641 } 2642 2643 /* Step 2: clear hash table */ 2644 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2645 bifa = &inet6_addr_lst[i]; 2646 2647 write_lock_bh(&addrconf_hash_lock); 2648 while ((ifa = *bifa) != NULL) { 2649 if (ifa->idev == idev) { 2650 *bifa = ifa->lst_next; 2651 ifa->lst_next = NULL; 2652 addrconf_del_timer(ifa); 2653 in6_ifa_put(ifa); 2654 continue; 2655 } 2656 bifa = &ifa->lst_next; 2657 } 2658 write_unlock_bh(&addrconf_hash_lock); 2659 } 2660 2661 write_lock_bh(&idev->lock); 2662 2663 /* Step 3: clear flags for stateless addrconf */ 2664 if (!how) 2665 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2666 2667 /* Step 4: clear address list */ 2668 #ifdef CONFIG_IPV6_PRIVACY 2669 if (how && del_timer(&idev->regen_timer)) 2670 in6_dev_put(idev); 2671 2672 /* clear tempaddr list */ 2673 while ((ifa = idev->tempaddr_list) != NULL) { 2674 idev->tempaddr_list = ifa->tmp_next; 2675 ifa->tmp_next = NULL; 2676 ifa->dead = 1; 2677 write_unlock_bh(&idev->lock); 2678 spin_lock_bh(&ifa->lock); 2679 2680 if (ifa->ifpub) { 2681 in6_ifa_put(ifa->ifpub); 2682 ifa->ifpub = NULL; 2683 } 2684 spin_unlock_bh(&ifa->lock); 2685 in6_ifa_put(ifa); 2686 write_lock_bh(&idev->lock); 2687 } 2688 #endif 2689 while ((ifa = idev->addr_list) != NULL) { 2690 idev->addr_list = ifa->if_next; 2691 ifa->if_next = NULL; 2692 ifa->dead = 1; 2693 addrconf_del_timer(ifa); 2694 write_unlock_bh(&idev->lock); 2695 2696 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2697 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2698 in6_ifa_put(ifa); 2699 2700 write_lock_bh(&idev->lock); 2701 } 2702 write_unlock_bh(&idev->lock); 2703 2704 /* Step 5: Discard multicast list */ 2705 2706 if (how) 2707 ipv6_mc_destroy_dev(idev); 2708 else 2709 ipv6_mc_down(idev); 2710 2711 idev->tstamp = jiffies; 2712 2713 /* Shot the device (if unregistered) */ 2714 2715 if (how) { 2716 addrconf_sysctl_unregister(idev); 2717 neigh_parms_release(&nd_tbl, idev->nd_parms); 2718 neigh_ifdown(&nd_tbl, dev); 2719 in6_dev_put(idev); 2720 } 2721 return 0; 2722 } 2723 2724 static void addrconf_rs_timer(unsigned long data) 2725 { 2726 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2727 2728 if (ifp->idev->cnf.forwarding) 2729 goto out; 2730 2731 if (ifp->idev->if_flags & IF_RA_RCVD) { 2732 /* 2733 * Announcement received after solicitation 2734 * was sent 2735 */ 2736 goto out; 2737 } 2738 2739 spin_lock(&ifp->lock); 2740 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2741 /* The wait after the last probe can be shorter */ 2742 addrconf_mod_timer(ifp, AC_RS, 2743 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2744 ifp->idev->cnf.rtr_solicit_delay : 2745 ifp->idev->cnf.rtr_solicit_interval); 2746 spin_unlock(&ifp->lock); 2747 2748 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2749 } else { 2750 spin_unlock(&ifp->lock); 2751 /* 2752 * Note: we do not support deprecated "all on-link" 2753 * assumption any longer. 2754 */ 2755 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2756 ifp->idev->dev->name); 2757 } 2758 2759 out: 2760 in6_ifa_put(ifp); 2761 } 2762 2763 /* 2764 * Duplicate Address Detection 2765 */ 2766 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2767 { 2768 unsigned long rand_num; 2769 struct inet6_dev *idev = ifp->idev; 2770 2771 if (ifp->flags & IFA_F_OPTIMISTIC) 2772 rand_num = 0; 2773 else 2774 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2775 2776 ifp->probes = idev->cnf.dad_transmits; 2777 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2778 } 2779 2780 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2781 { 2782 struct inet6_dev *idev = ifp->idev; 2783 struct net_device *dev = idev->dev; 2784 2785 addrconf_join_solict(dev, &ifp->addr); 2786 2787 net_srandom(ifp->addr.s6_addr32[3]); 2788 2789 read_lock_bh(&idev->lock); 2790 if (ifp->dead) 2791 goto out; 2792 spin_lock_bh(&ifp->lock); 2793 2794 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2795 idev->cnf.accept_dad < 1 || 2796 !(ifp->flags&IFA_F_TENTATIVE) || 2797 ifp->flags & IFA_F_NODAD) { 2798 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2799 spin_unlock_bh(&ifp->lock); 2800 read_unlock_bh(&idev->lock); 2801 2802 addrconf_dad_completed(ifp); 2803 return; 2804 } 2805 2806 if (!(idev->if_flags & IF_READY)) { 2807 spin_unlock_bh(&ifp->lock); 2808 read_unlock_bh(&idev->lock); 2809 /* 2810 * If the device is not ready: 2811 * - keep it tentative if it is a permanent address. 2812 * - otherwise, kill it. 2813 */ 2814 in6_ifa_hold(ifp); 2815 addrconf_dad_stop(ifp, 0); 2816 return; 2817 } 2818 2819 /* 2820 * Optimistic nodes can start receiving 2821 * Frames right away 2822 */ 2823 if(ifp->flags & IFA_F_OPTIMISTIC) 2824 ip6_ins_rt(ifp->rt); 2825 2826 addrconf_dad_kick(ifp); 2827 spin_unlock_bh(&ifp->lock); 2828 out: 2829 read_unlock_bh(&idev->lock); 2830 } 2831 2832 static void addrconf_dad_timer(unsigned long data) 2833 { 2834 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2835 struct inet6_dev *idev = ifp->idev; 2836 struct in6_addr mcaddr; 2837 2838 read_lock_bh(&idev->lock); 2839 if (idev->dead) { 2840 read_unlock_bh(&idev->lock); 2841 goto out; 2842 } 2843 spin_lock_bh(&ifp->lock); 2844 if (ifp->probes == 0) { 2845 /* 2846 * DAD was successful 2847 */ 2848 2849 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2850 spin_unlock_bh(&ifp->lock); 2851 read_unlock_bh(&idev->lock); 2852 2853 addrconf_dad_completed(ifp); 2854 2855 goto out; 2856 } 2857 2858 ifp->probes--; 2859 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2860 spin_unlock_bh(&ifp->lock); 2861 read_unlock_bh(&idev->lock); 2862 2863 /* send a neighbour solicitation for our addr */ 2864 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2865 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2866 out: 2867 in6_ifa_put(ifp); 2868 } 2869 2870 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2871 { 2872 struct net_device * dev = ifp->idev->dev; 2873 2874 /* 2875 * Configure the address for reception. Now it is valid. 2876 */ 2877 2878 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2879 2880 /* If added prefix is link local and forwarding is off, 2881 start sending router solicitations. 2882 */ 2883 2884 if (ifp->idev->cnf.forwarding == 0 && 2885 ifp->idev->cnf.rtr_solicits > 0 && 2886 (dev->flags&IFF_LOOPBACK) == 0 && 2887 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2888 /* 2889 * If a host as already performed a random delay 2890 * [...] as part of DAD [...] there is no need 2891 * to delay again before sending the first RS 2892 */ 2893 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2894 2895 spin_lock_bh(&ifp->lock); 2896 ifp->probes = 1; 2897 ifp->idev->if_flags |= IF_RS_SENT; 2898 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2899 spin_unlock_bh(&ifp->lock); 2900 } 2901 } 2902 2903 static void addrconf_dad_run(struct inet6_dev *idev) { 2904 struct inet6_ifaddr *ifp; 2905 2906 read_lock_bh(&idev->lock); 2907 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2908 spin_lock_bh(&ifp->lock); 2909 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2910 spin_unlock_bh(&ifp->lock); 2911 continue; 2912 } 2913 spin_unlock_bh(&ifp->lock); 2914 addrconf_dad_kick(ifp); 2915 } 2916 read_unlock_bh(&idev->lock); 2917 } 2918 2919 #ifdef CONFIG_PROC_FS 2920 struct if6_iter_state { 2921 struct seq_net_private p; 2922 int bucket; 2923 }; 2924 2925 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2926 { 2927 struct inet6_ifaddr *ifa = NULL; 2928 struct if6_iter_state *state = seq->private; 2929 struct net *net = seq_file_net(seq); 2930 2931 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2932 ifa = inet6_addr_lst[state->bucket]; 2933 2934 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2935 ifa = ifa->lst_next; 2936 if (ifa) 2937 break; 2938 } 2939 return ifa; 2940 } 2941 2942 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2943 { 2944 struct if6_iter_state *state = seq->private; 2945 struct net *net = seq_file_net(seq); 2946 2947 ifa = ifa->lst_next; 2948 try_again: 2949 if (ifa) { 2950 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2951 ifa = ifa->lst_next; 2952 goto try_again; 2953 } 2954 } 2955 2956 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2957 ifa = inet6_addr_lst[state->bucket]; 2958 goto try_again; 2959 } 2960 2961 return ifa; 2962 } 2963 2964 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2965 { 2966 struct inet6_ifaddr *ifa = if6_get_first(seq); 2967 2968 if (ifa) 2969 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2970 --pos; 2971 return pos ? NULL : ifa; 2972 } 2973 2974 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2975 __acquires(addrconf_hash_lock) 2976 { 2977 read_lock_bh(&addrconf_hash_lock); 2978 return if6_get_idx(seq, *pos); 2979 } 2980 2981 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2982 { 2983 struct inet6_ifaddr *ifa; 2984 2985 ifa = if6_get_next(seq, v); 2986 ++*pos; 2987 return ifa; 2988 } 2989 2990 static void if6_seq_stop(struct seq_file *seq, void *v) 2991 __releases(addrconf_hash_lock) 2992 { 2993 read_unlock_bh(&addrconf_hash_lock); 2994 } 2995 2996 static int if6_seq_show(struct seq_file *seq, void *v) 2997 { 2998 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2999 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3000 &ifp->addr, 3001 ifp->idev->dev->ifindex, 3002 ifp->prefix_len, 3003 ifp->scope, 3004 ifp->flags, 3005 ifp->idev->dev->name); 3006 return 0; 3007 } 3008 3009 static const struct seq_operations if6_seq_ops = { 3010 .start = if6_seq_start, 3011 .next = if6_seq_next, 3012 .show = if6_seq_show, 3013 .stop = if6_seq_stop, 3014 }; 3015 3016 static int if6_seq_open(struct inode *inode, struct file *file) 3017 { 3018 return seq_open_net(inode, file, &if6_seq_ops, 3019 sizeof(struct if6_iter_state)); 3020 } 3021 3022 static const struct file_operations if6_fops = { 3023 .owner = THIS_MODULE, 3024 .open = if6_seq_open, 3025 .read = seq_read, 3026 .llseek = seq_lseek, 3027 .release = seq_release_net, 3028 }; 3029 3030 static int if6_proc_net_init(struct net *net) 3031 { 3032 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3033 return -ENOMEM; 3034 return 0; 3035 } 3036 3037 static void if6_proc_net_exit(struct net *net) 3038 { 3039 proc_net_remove(net, "if_inet6"); 3040 } 3041 3042 static struct pernet_operations if6_proc_net_ops = { 3043 .init = if6_proc_net_init, 3044 .exit = if6_proc_net_exit, 3045 }; 3046 3047 int __init if6_proc_init(void) 3048 { 3049 return register_pernet_subsys(&if6_proc_net_ops); 3050 } 3051 3052 void if6_proc_exit(void) 3053 { 3054 unregister_pernet_subsys(&if6_proc_net_ops); 3055 } 3056 #endif /* CONFIG_PROC_FS */ 3057 3058 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3059 /* Check if address is a home address configured on any interface. */ 3060 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3061 { 3062 int ret = 0; 3063 struct inet6_ifaddr * ifp; 3064 u8 hash = ipv6_addr_hash(addr); 3065 read_lock_bh(&addrconf_hash_lock); 3066 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 3067 if (!net_eq(dev_net(ifp->idev->dev), net)) 3068 continue; 3069 if (ipv6_addr_equal(&ifp->addr, addr) && 3070 (ifp->flags & IFA_F_HOMEADDRESS)) { 3071 ret = 1; 3072 break; 3073 } 3074 } 3075 read_unlock_bh(&addrconf_hash_lock); 3076 return ret; 3077 } 3078 #endif 3079 3080 /* 3081 * Periodic address status verification 3082 */ 3083 3084 static void addrconf_verify(unsigned long foo) 3085 { 3086 struct inet6_ifaddr *ifp; 3087 unsigned long now, next; 3088 int i; 3089 3090 spin_lock_bh(&addrconf_verify_lock); 3091 now = jiffies; 3092 next = now + ADDR_CHECK_FREQUENCY; 3093 3094 del_timer(&addr_chk_timer); 3095 3096 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3097 3098 restart: 3099 read_lock(&addrconf_hash_lock); 3100 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3101 unsigned long age; 3102 #ifdef CONFIG_IPV6_PRIVACY 3103 unsigned long regen_advance; 3104 #endif 3105 3106 if (ifp->flags & IFA_F_PERMANENT) 3107 continue; 3108 3109 spin_lock(&ifp->lock); 3110 age = (now - ifp->tstamp) / HZ; 3111 3112 #ifdef CONFIG_IPV6_PRIVACY 3113 regen_advance = ifp->idev->cnf.regen_max_retry * 3114 ifp->idev->cnf.dad_transmits * 3115 ifp->idev->nd_parms->retrans_time / HZ; 3116 #endif 3117 3118 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3119 age >= ifp->valid_lft) { 3120 spin_unlock(&ifp->lock); 3121 in6_ifa_hold(ifp); 3122 read_unlock(&addrconf_hash_lock); 3123 ipv6_del_addr(ifp); 3124 goto restart; 3125 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3126 spin_unlock(&ifp->lock); 3127 continue; 3128 } else if (age >= ifp->prefered_lft) { 3129 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3130 int deprecate = 0; 3131 3132 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3133 deprecate = 1; 3134 ifp->flags |= IFA_F_DEPRECATED; 3135 } 3136 3137 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3138 next = ifp->tstamp + ifp->valid_lft * HZ; 3139 3140 spin_unlock(&ifp->lock); 3141 3142 if (deprecate) { 3143 in6_ifa_hold(ifp); 3144 read_unlock(&addrconf_hash_lock); 3145 3146 ipv6_ifa_notify(0, ifp); 3147 in6_ifa_put(ifp); 3148 goto restart; 3149 } 3150 #ifdef CONFIG_IPV6_PRIVACY 3151 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3152 !(ifp->flags&IFA_F_TENTATIVE)) { 3153 if (age >= ifp->prefered_lft - regen_advance) { 3154 struct inet6_ifaddr *ifpub = ifp->ifpub; 3155 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3156 next = ifp->tstamp + ifp->prefered_lft * HZ; 3157 if (!ifp->regen_count && ifpub) { 3158 ifp->regen_count++; 3159 in6_ifa_hold(ifp); 3160 in6_ifa_hold(ifpub); 3161 spin_unlock(&ifp->lock); 3162 read_unlock(&addrconf_hash_lock); 3163 spin_lock(&ifpub->lock); 3164 ifpub->regen_count = 0; 3165 spin_unlock(&ifpub->lock); 3166 ipv6_create_tempaddr(ifpub, ifp); 3167 in6_ifa_put(ifpub); 3168 in6_ifa_put(ifp); 3169 goto restart; 3170 } 3171 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3172 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3173 spin_unlock(&ifp->lock); 3174 #endif 3175 } else { 3176 /* ifp->prefered_lft <= ifp->valid_lft */ 3177 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3178 next = ifp->tstamp + ifp->prefered_lft * HZ; 3179 spin_unlock(&ifp->lock); 3180 } 3181 } 3182 read_unlock(&addrconf_hash_lock); 3183 } 3184 3185 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3186 add_timer(&addr_chk_timer); 3187 spin_unlock_bh(&addrconf_verify_lock); 3188 } 3189 3190 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3191 { 3192 struct in6_addr *pfx = NULL; 3193 3194 if (addr) 3195 pfx = nla_data(addr); 3196 3197 if (local) { 3198 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3199 pfx = NULL; 3200 else 3201 pfx = nla_data(local); 3202 } 3203 3204 return pfx; 3205 } 3206 3207 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3208 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3209 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3210 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3211 }; 3212 3213 static int 3214 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3215 { 3216 struct net *net = sock_net(skb->sk); 3217 struct ifaddrmsg *ifm; 3218 struct nlattr *tb[IFA_MAX+1]; 3219 struct in6_addr *pfx; 3220 int err; 3221 3222 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3223 if (err < 0) 3224 return err; 3225 3226 ifm = nlmsg_data(nlh); 3227 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3228 if (pfx == NULL) 3229 return -EINVAL; 3230 3231 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3232 } 3233 3234 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3235 u32 prefered_lft, u32 valid_lft) 3236 { 3237 u32 flags; 3238 clock_t expires; 3239 unsigned long timeout; 3240 3241 if (!valid_lft || (prefered_lft > valid_lft)) 3242 return -EINVAL; 3243 3244 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3245 if (addrconf_finite_timeout(timeout)) { 3246 expires = jiffies_to_clock_t(timeout * HZ); 3247 valid_lft = timeout; 3248 flags = RTF_EXPIRES; 3249 } else { 3250 expires = 0; 3251 flags = 0; 3252 ifa_flags |= IFA_F_PERMANENT; 3253 } 3254 3255 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3256 if (addrconf_finite_timeout(timeout)) { 3257 if (timeout == 0) 3258 ifa_flags |= IFA_F_DEPRECATED; 3259 prefered_lft = timeout; 3260 } 3261 3262 spin_lock_bh(&ifp->lock); 3263 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3264 ifp->tstamp = jiffies; 3265 ifp->valid_lft = valid_lft; 3266 ifp->prefered_lft = prefered_lft; 3267 3268 spin_unlock_bh(&ifp->lock); 3269 if (!(ifp->flags&IFA_F_TENTATIVE)) 3270 ipv6_ifa_notify(0, ifp); 3271 3272 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3273 expires, flags); 3274 addrconf_verify(0); 3275 3276 return 0; 3277 } 3278 3279 static int 3280 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3281 { 3282 struct net *net = sock_net(skb->sk); 3283 struct ifaddrmsg *ifm; 3284 struct nlattr *tb[IFA_MAX+1]; 3285 struct in6_addr *pfx; 3286 struct inet6_ifaddr *ifa; 3287 struct net_device *dev; 3288 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3289 u8 ifa_flags; 3290 int err; 3291 3292 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3293 if (err < 0) 3294 return err; 3295 3296 ifm = nlmsg_data(nlh); 3297 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3298 if (pfx == NULL) 3299 return -EINVAL; 3300 3301 if (tb[IFA_CACHEINFO]) { 3302 struct ifa_cacheinfo *ci; 3303 3304 ci = nla_data(tb[IFA_CACHEINFO]); 3305 valid_lft = ci->ifa_valid; 3306 preferred_lft = ci->ifa_prefered; 3307 } else { 3308 preferred_lft = INFINITY_LIFE_TIME; 3309 valid_lft = INFINITY_LIFE_TIME; 3310 } 3311 3312 dev = __dev_get_by_index(net, ifm->ifa_index); 3313 if (dev == NULL) 3314 return -ENODEV; 3315 3316 /* We ignore other flags so far. */ 3317 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3318 3319 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3320 if (ifa == NULL) { 3321 /* 3322 * It would be best to check for !NLM_F_CREATE here but 3323 * userspace alreay relies on not having to provide this. 3324 */ 3325 return inet6_addr_add(net, ifm->ifa_index, pfx, 3326 ifm->ifa_prefixlen, ifa_flags, 3327 preferred_lft, valid_lft); 3328 } 3329 3330 if (nlh->nlmsg_flags & NLM_F_EXCL || 3331 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3332 err = -EEXIST; 3333 else 3334 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3335 3336 in6_ifa_put(ifa); 3337 3338 return err; 3339 } 3340 3341 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3342 u8 scope, int ifindex) 3343 { 3344 struct ifaddrmsg *ifm; 3345 3346 ifm = nlmsg_data(nlh); 3347 ifm->ifa_family = AF_INET6; 3348 ifm->ifa_prefixlen = prefixlen; 3349 ifm->ifa_flags = flags; 3350 ifm->ifa_scope = scope; 3351 ifm->ifa_index = ifindex; 3352 } 3353 3354 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3355 unsigned long tstamp, u32 preferred, u32 valid) 3356 { 3357 struct ifa_cacheinfo ci; 3358 3359 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3360 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3361 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3362 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3363 ci.ifa_prefered = preferred; 3364 ci.ifa_valid = valid; 3365 3366 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3367 } 3368 3369 static inline int rt_scope(int ifa_scope) 3370 { 3371 if (ifa_scope & IFA_HOST) 3372 return RT_SCOPE_HOST; 3373 else if (ifa_scope & IFA_LINK) 3374 return RT_SCOPE_LINK; 3375 else if (ifa_scope & IFA_SITE) 3376 return RT_SCOPE_SITE; 3377 else 3378 return RT_SCOPE_UNIVERSE; 3379 } 3380 3381 static inline int inet6_ifaddr_msgsize(void) 3382 { 3383 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3384 + nla_total_size(16) /* IFA_ADDRESS */ 3385 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3386 } 3387 3388 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3389 u32 pid, u32 seq, int event, unsigned int flags) 3390 { 3391 struct nlmsghdr *nlh; 3392 u32 preferred, valid; 3393 3394 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3395 if (nlh == NULL) 3396 return -EMSGSIZE; 3397 3398 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3399 ifa->idev->dev->ifindex); 3400 3401 if (!(ifa->flags&IFA_F_PERMANENT)) { 3402 preferred = ifa->prefered_lft; 3403 valid = ifa->valid_lft; 3404 if (preferred != INFINITY_LIFE_TIME) { 3405 long tval = (jiffies - ifa->tstamp)/HZ; 3406 if (preferred > tval) 3407 preferred -= tval; 3408 else 3409 preferred = 0; 3410 if (valid != INFINITY_LIFE_TIME) 3411 valid -= tval; 3412 } 3413 } else { 3414 preferred = INFINITY_LIFE_TIME; 3415 valid = INFINITY_LIFE_TIME; 3416 } 3417 3418 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3419 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3420 nlmsg_cancel(skb, nlh); 3421 return -EMSGSIZE; 3422 } 3423 3424 return nlmsg_end(skb, nlh); 3425 } 3426 3427 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3428 u32 pid, u32 seq, int event, u16 flags) 3429 { 3430 struct nlmsghdr *nlh; 3431 u8 scope = RT_SCOPE_UNIVERSE; 3432 int ifindex = ifmca->idev->dev->ifindex; 3433 3434 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3435 scope = RT_SCOPE_SITE; 3436 3437 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3438 if (nlh == NULL) 3439 return -EMSGSIZE; 3440 3441 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3442 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3443 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3444 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3445 nlmsg_cancel(skb, nlh); 3446 return -EMSGSIZE; 3447 } 3448 3449 return nlmsg_end(skb, nlh); 3450 } 3451 3452 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3453 u32 pid, u32 seq, int event, unsigned int flags) 3454 { 3455 struct nlmsghdr *nlh; 3456 u8 scope = RT_SCOPE_UNIVERSE; 3457 int ifindex = ifaca->aca_idev->dev->ifindex; 3458 3459 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3460 scope = RT_SCOPE_SITE; 3461 3462 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3463 if (nlh == NULL) 3464 return -EMSGSIZE; 3465 3466 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3467 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3468 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3469 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3470 nlmsg_cancel(skb, nlh); 3471 return -EMSGSIZE; 3472 } 3473 3474 return nlmsg_end(skb, nlh); 3475 } 3476 3477 enum addr_type_t 3478 { 3479 UNICAST_ADDR, 3480 MULTICAST_ADDR, 3481 ANYCAST_ADDR, 3482 }; 3483 3484 /* called with rcu_read_lock() */ 3485 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3486 struct netlink_callback *cb, enum addr_type_t type, 3487 int s_ip_idx, int *p_ip_idx) 3488 { 3489 struct inet6_ifaddr *ifa; 3490 struct ifmcaddr6 *ifmca; 3491 struct ifacaddr6 *ifaca; 3492 int err = 1; 3493 int ip_idx = *p_ip_idx; 3494 3495 read_lock_bh(&idev->lock); 3496 switch (type) { 3497 case UNICAST_ADDR: 3498 /* unicast address incl. temp addr */ 3499 for (ifa = idev->addr_list; ifa; 3500 ifa = ifa->if_next, ip_idx++) { 3501 if (ip_idx < s_ip_idx) 3502 continue; 3503 err = inet6_fill_ifaddr(skb, ifa, 3504 NETLINK_CB(cb->skb).pid, 3505 cb->nlh->nlmsg_seq, 3506 RTM_NEWADDR, 3507 NLM_F_MULTI); 3508 if (err <= 0) 3509 break; 3510 } 3511 break; 3512 case MULTICAST_ADDR: 3513 /* multicast address */ 3514 for (ifmca = idev->mc_list; ifmca; 3515 ifmca = ifmca->next, ip_idx++) { 3516 if (ip_idx < s_ip_idx) 3517 continue; 3518 err = inet6_fill_ifmcaddr(skb, ifmca, 3519 NETLINK_CB(cb->skb).pid, 3520 cb->nlh->nlmsg_seq, 3521 RTM_GETMULTICAST, 3522 NLM_F_MULTI); 3523 if (err <= 0) 3524 break; 3525 } 3526 break; 3527 case ANYCAST_ADDR: 3528 /* anycast address */ 3529 for (ifaca = idev->ac_list; ifaca; 3530 ifaca = ifaca->aca_next, ip_idx++) { 3531 if (ip_idx < s_ip_idx) 3532 continue; 3533 err = inet6_fill_ifacaddr(skb, ifaca, 3534 NETLINK_CB(cb->skb).pid, 3535 cb->nlh->nlmsg_seq, 3536 RTM_GETANYCAST, 3537 NLM_F_MULTI); 3538 if (err <= 0) 3539 break; 3540 } 3541 break; 3542 default: 3543 break; 3544 } 3545 read_unlock_bh(&idev->lock); 3546 *p_ip_idx = ip_idx; 3547 return err; 3548 } 3549 3550 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3551 enum addr_type_t type) 3552 { 3553 struct net *net = sock_net(skb->sk); 3554 int h, s_h; 3555 int idx, ip_idx; 3556 int s_idx, s_ip_idx; 3557 struct net_device *dev; 3558 struct inet6_dev *idev; 3559 struct hlist_head *head; 3560 struct hlist_node *node; 3561 3562 s_h = cb->args[0]; 3563 s_idx = idx = cb->args[1]; 3564 s_ip_idx = ip_idx = cb->args[2]; 3565 3566 rcu_read_lock(); 3567 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3568 idx = 0; 3569 head = &net->dev_index_head[h]; 3570 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3571 if (idx < s_idx) 3572 goto cont; 3573 if (idx > s_idx) 3574 s_ip_idx = 0; 3575 ip_idx = 0; 3576 if ((idev = __in6_dev_get(dev)) == NULL) 3577 goto cont; 3578 3579 if (in6_dump_addrs(idev, skb, cb, type, 3580 s_ip_idx, &ip_idx) <= 0) 3581 goto done; 3582 cont: 3583 idx++; 3584 } 3585 } 3586 done: 3587 rcu_read_unlock(); 3588 cb->args[0] = h; 3589 cb->args[1] = idx; 3590 cb->args[2] = ip_idx; 3591 3592 return skb->len; 3593 } 3594 3595 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3596 { 3597 enum addr_type_t type = UNICAST_ADDR; 3598 3599 return inet6_dump_addr(skb, cb, type); 3600 } 3601 3602 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3603 { 3604 enum addr_type_t type = MULTICAST_ADDR; 3605 3606 return inet6_dump_addr(skb, cb, type); 3607 } 3608 3609 3610 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3611 { 3612 enum addr_type_t type = ANYCAST_ADDR; 3613 3614 return inet6_dump_addr(skb, cb, type); 3615 } 3616 3617 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3618 void *arg) 3619 { 3620 struct net *net = sock_net(in_skb->sk); 3621 struct ifaddrmsg *ifm; 3622 struct nlattr *tb[IFA_MAX+1]; 3623 struct in6_addr *addr = NULL; 3624 struct net_device *dev = NULL; 3625 struct inet6_ifaddr *ifa; 3626 struct sk_buff *skb; 3627 int err; 3628 3629 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3630 if (err < 0) 3631 goto errout; 3632 3633 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3634 if (addr == NULL) { 3635 err = -EINVAL; 3636 goto errout; 3637 } 3638 3639 ifm = nlmsg_data(nlh); 3640 if (ifm->ifa_index) 3641 dev = __dev_get_by_index(net, ifm->ifa_index); 3642 3643 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3644 err = -EADDRNOTAVAIL; 3645 goto errout; 3646 } 3647 3648 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3649 err = -ENOBUFS; 3650 goto errout_ifa; 3651 } 3652 3653 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3654 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3655 if (err < 0) { 3656 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3657 WARN_ON(err == -EMSGSIZE); 3658 kfree_skb(skb); 3659 goto errout_ifa; 3660 } 3661 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3662 errout_ifa: 3663 in6_ifa_put(ifa); 3664 errout: 3665 return err; 3666 } 3667 3668 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3669 { 3670 struct sk_buff *skb; 3671 struct net *net = dev_net(ifa->idev->dev); 3672 int err = -ENOBUFS; 3673 3674 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3675 if (skb == NULL) 3676 goto errout; 3677 3678 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3679 if (err < 0) { 3680 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3681 WARN_ON(err == -EMSGSIZE); 3682 kfree_skb(skb); 3683 goto errout; 3684 } 3685 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3686 return; 3687 errout: 3688 if (err < 0) 3689 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3690 } 3691 3692 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3693 __s32 *array, int bytes) 3694 { 3695 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3696 3697 memset(array, 0, bytes); 3698 array[DEVCONF_FORWARDING] = cnf->forwarding; 3699 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3700 array[DEVCONF_MTU6] = cnf->mtu6; 3701 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3702 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3703 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3704 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3705 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3706 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3707 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3708 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3709 #ifdef CONFIG_IPV6_PRIVACY 3710 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3711 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3712 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3713 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3714 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3715 #endif 3716 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3717 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3718 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3719 #ifdef CONFIG_IPV6_ROUTER_PREF 3720 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3721 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3722 #ifdef CONFIG_IPV6_ROUTE_INFO 3723 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3724 #endif 3725 #endif 3726 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3727 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3728 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3729 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3730 #endif 3731 #ifdef CONFIG_IPV6_MROUTE 3732 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3733 #endif 3734 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3735 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3736 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3737 } 3738 3739 static inline size_t inet6_if_nlmsg_size(void) 3740 { 3741 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3742 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3743 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3744 + nla_total_size(4) /* IFLA_MTU */ 3745 + nla_total_size(4) /* IFLA_LINK */ 3746 + nla_total_size( /* IFLA_PROTINFO */ 3747 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3748 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3749 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3750 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3751 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3752 ); 3753 } 3754 3755 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3756 int bytes) 3757 { 3758 int i; 3759 int pad = bytes - sizeof(u64) * items; 3760 BUG_ON(pad < 0); 3761 3762 /* Use put_unaligned() because stats may not be aligned for u64. */ 3763 put_unaligned(items, &stats[0]); 3764 for (i = 1; i < items; i++) 3765 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3766 3767 memset(&stats[items], 0, pad); 3768 } 3769 3770 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3771 int bytes) 3772 { 3773 switch(attrtype) { 3774 case IFLA_INET6_STATS: 3775 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3776 break; 3777 case IFLA_INET6_ICMP6STATS: 3778 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3779 break; 3780 } 3781 } 3782 3783 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3784 u32 pid, u32 seq, int event, unsigned int flags) 3785 { 3786 struct net_device *dev = idev->dev; 3787 struct nlattr *nla; 3788 struct ifinfomsg *hdr; 3789 struct nlmsghdr *nlh; 3790 void *protoinfo; 3791 struct ifla_cacheinfo ci; 3792 3793 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3794 if (nlh == NULL) 3795 return -EMSGSIZE; 3796 3797 hdr = nlmsg_data(nlh); 3798 hdr->ifi_family = AF_INET6; 3799 hdr->__ifi_pad = 0; 3800 hdr->ifi_type = dev->type; 3801 hdr->ifi_index = dev->ifindex; 3802 hdr->ifi_flags = dev_get_flags(dev); 3803 hdr->ifi_change = 0; 3804 3805 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3806 3807 if (dev->addr_len) 3808 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3809 3810 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3811 if (dev->ifindex != dev->iflink) 3812 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3813 3814 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3815 if (protoinfo == NULL) 3816 goto nla_put_failure; 3817 3818 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3819 3820 ci.max_reasm_len = IPV6_MAXPLEN; 3821 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3822 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3823 ci.reachable_time = idev->nd_parms->reachable_time; 3824 ci.retrans_time = idev->nd_parms->retrans_time; 3825 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3826 3827 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3828 if (nla == NULL) 3829 goto nla_put_failure; 3830 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3831 3832 /* XXX - MC not implemented */ 3833 3834 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3835 if (nla == NULL) 3836 goto nla_put_failure; 3837 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3838 3839 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3840 if (nla == NULL) 3841 goto nla_put_failure; 3842 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3843 3844 nla_nest_end(skb, protoinfo); 3845 return nlmsg_end(skb, nlh); 3846 3847 nla_put_failure: 3848 nlmsg_cancel(skb, nlh); 3849 return -EMSGSIZE; 3850 } 3851 3852 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3853 { 3854 struct net *net = sock_net(skb->sk); 3855 int h, s_h; 3856 int idx = 0, s_idx; 3857 struct net_device *dev; 3858 struct inet6_dev *idev; 3859 struct hlist_head *head; 3860 struct hlist_node *node; 3861 3862 s_h = cb->args[0]; 3863 s_idx = cb->args[1]; 3864 3865 rcu_read_lock(); 3866 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3867 idx = 0; 3868 head = &net->dev_index_head[h]; 3869 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3870 if (idx < s_idx) 3871 goto cont; 3872 idev = __in6_dev_get(dev); 3873 if (!idev) 3874 goto cont; 3875 if (inet6_fill_ifinfo(skb, idev, 3876 NETLINK_CB(cb->skb).pid, 3877 cb->nlh->nlmsg_seq, 3878 RTM_NEWLINK, NLM_F_MULTI) <= 0) 3879 goto out; 3880 cont: 3881 idx++; 3882 } 3883 } 3884 out: 3885 rcu_read_unlock(); 3886 cb->args[1] = idx; 3887 cb->args[0] = h; 3888 3889 return skb->len; 3890 } 3891 3892 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3893 { 3894 struct sk_buff *skb; 3895 struct net *net = dev_net(idev->dev); 3896 int err = -ENOBUFS; 3897 3898 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3899 if (skb == NULL) 3900 goto errout; 3901 3902 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3903 if (err < 0) { 3904 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3905 WARN_ON(err == -EMSGSIZE); 3906 kfree_skb(skb); 3907 goto errout; 3908 } 3909 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3910 return; 3911 errout: 3912 if (err < 0) 3913 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3914 } 3915 3916 static inline size_t inet6_prefix_nlmsg_size(void) 3917 { 3918 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3919 + nla_total_size(sizeof(struct in6_addr)) 3920 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3921 } 3922 3923 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3924 struct prefix_info *pinfo, u32 pid, u32 seq, 3925 int event, unsigned int flags) 3926 { 3927 struct prefixmsg *pmsg; 3928 struct nlmsghdr *nlh; 3929 struct prefix_cacheinfo ci; 3930 3931 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3932 if (nlh == NULL) 3933 return -EMSGSIZE; 3934 3935 pmsg = nlmsg_data(nlh); 3936 pmsg->prefix_family = AF_INET6; 3937 pmsg->prefix_pad1 = 0; 3938 pmsg->prefix_pad2 = 0; 3939 pmsg->prefix_ifindex = idev->dev->ifindex; 3940 pmsg->prefix_len = pinfo->prefix_len; 3941 pmsg->prefix_type = pinfo->type; 3942 pmsg->prefix_pad3 = 0; 3943 pmsg->prefix_flags = 0; 3944 if (pinfo->onlink) 3945 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3946 if (pinfo->autoconf) 3947 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3948 3949 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3950 3951 ci.preferred_time = ntohl(pinfo->prefered); 3952 ci.valid_time = ntohl(pinfo->valid); 3953 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3954 3955 return nlmsg_end(skb, nlh); 3956 3957 nla_put_failure: 3958 nlmsg_cancel(skb, nlh); 3959 return -EMSGSIZE; 3960 } 3961 3962 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3963 struct prefix_info *pinfo) 3964 { 3965 struct sk_buff *skb; 3966 struct net *net = dev_net(idev->dev); 3967 int err = -ENOBUFS; 3968 3969 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3970 if (skb == NULL) 3971 goto errout; 3972 3973 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3974 if (err < 0) { 3975 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3976 WARN_ON(err == -EMSGSIZE); 3977 kfree_skb(skb); 3978 goto errout; 3979 } 3980 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3981 return; 3982 errout: 3983 if (err < 0) 3984 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3985 } 3986 3987 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3988 { 3989 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3990 3991 switch (event) { 3992 case RTM_NEWADDR: 3993 /* 3994 * If the address was optimistic 3995 * we inserted the route at the start of 3996 * our DAD process, so we don't need 3997 * to do it again 3998 */ 3999 if (!(ifp->rt->rt6i_node)) 4000 ip6_ins_rt(ifp->rt); 4001 if (ifp->idev->cnf.forwarding) 4002 addrconf_join_anycast(ifp); 4003 break; 4004 case RTM_DELADDR: 4005 if (ifp->idev->cnf.forwarding) 4006 addrconf_leave_anycast(ifp); 4007 addrconf_leave_solict(ifp->idev, &ifp->addr); 4008 dst_hold(&ifp->rt->u.dst); 4009 if (ip6_del_rt(ifp->rt)) 4010 dst_free(&ifp->rt->u.dst); 4011 break; 4012 } 4013 } 4014 4015 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4016 { 4017 rcu_read_lock_bh(); 4018 if (likely(ifp->idev->dead == 0)) 4019 __ipv6_ifa_notify(event, ifp); 4020 rcu_read_unlock_bh(); 4021 } 4022 4023 #ifdef CONFIG_SYSCTL 4024 4025 static 4026 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4027 void __user *buffer, size_t *lenp, loff_t *ppos) 4028 { 4029 int *valp = ctl->data; 4030 int val = *valp; 4031 int ret; 4032 4033 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4034 4035 if (write) 4036 ret = addrconf_fixup_forwarding(ctl, valp, val); 4037 return ret; 4038 } 4039 4040 static void dev_disable_change(struct inet6_dev *idev) 4041 { 4042 if (!idev || !idev->dev) 4043 return; 4044 4045 if (idev->cnf.disable_ipv6) 4046 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4047 else 4048 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4049 } 4050 4051 static void addrconf_disable_change(struct net *net, __s32 newf) 4052 { 4053 struct net_device *dev; 4054 struct inet6_dev *idev; 4055 4056 rcu_read_lock(); 4057 for_each_netdev_rcu(net, dev) { 4058 idev = __in6_dev_get(dev); 4059 if (idev) { 4060 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4061 idev->cnf.disable_ipv6 = newf; 4062 if (changed) 4063 dev_disable_change(idev); 4064 } 4065 } 4066 rcu_read_unlock(); 4067 } 4068 4069 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4070 { 4071 struct net *net; 4072 4073 net = (struct net *)table->extra2; 4074 4075 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4076 return 0; 4077 4078 if (!rtnl_trylock()) 4079 return restart_syscall(); 4080 4081 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4082 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4083 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4084 addrconf_disable_change(net, newf); 4085 } else if ((!*p) ^ (!old)) 4086 dev_disable_change((struct inet6_dev *)table->extra1); 4087 4088 rtnl_unlock(); 4089 return 0; 4090 } 4091 4092 static 4093 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4094 void __user *buffer, size_t *lenp, loff_t *ppos) 4095 { 4096 int *valp = ctl->data; 4097 int val = *valp; 4098 int ret; 4099 4100 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4101 4102 if (write) 4103 ret = addrconf_disable_ipv6(ctl, valp, val); 4104 return ret; 4105 } 4106 4107 static struct addrconf_sysctl_table 4108 { 4109 struct ctl_table_header *sysctl_header; 4110 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4111 char *dev_name; 4112 } addrconf_sysctl __read_mostly = { 4113 .sysctl_header = NULL, 4114 .addrconf_vars = { 4115 { 4116 .procname = "forwarding", 4117 .data = &ipv6_devconf.forwarding, 4118 .maxlen = sizeof(int), 4119 .mode = 0644, 4120 .proc_handler = addrconf_sysctl_forward, 4121 }, 4122 { 4123 .procname = "hop_limit", 4124 .data = &ipv6_devconf.hop_limit, 4125 .maxlen = sizeof(int), 4126 .mode = 0644, 4127 .proc_handler = proc_dointvec, 4128 }, 4129 { 4130 .procname = "mtu", 4131 .data = &ipv6_devconf.mtu6, 4132 .maxlen = sizeof(int), 4133 .mode = 0644, 4134 .proc_handler = proc_dointvec, 4135 }, 4136 { 4137 .procname = "accept_ra", 4138 .data = &ipv6_devconf.accept_ra, 4139 .maxlen = sizeof(int), 4140 .mode = 0644, 4141 .proc_handler = proc_dointvec, 4142 }, 4143 { 4144 .procname = "accept_redirects", 4145 .data = &ipv6_devconf.accept_redirects, 4146 .maxlen = sizeof(int), 4147 .mode = 0644, 4148 .proc_handler = proc_dointvec, 4149 }, 4150 { 4151 .procname = "autoconf", 4152 .data = &ipv6_devconf.autoconf, 4153 .maxlen = sizeof(int), 4154 .mode = 0644, 4155 .proc_handler = proc_dointvec, 4156 }, 4157 { 4158 .procname = "dad_transmits", 4159 .data = &ipv6_devconf.dad_transmits, 4160 .maxlen = sizeof(int), 4161 .mode = 0644, 4162 .proc_handler = proc_dointvec, 4163 }, 4164 { 4165 .procname = "router_solicitations", 4166 .data = &ipv6_devconf.rtr_solicits, 4167 .maxlen = sizeof(int), 4168 .mode = 0644, 4169 .proc_handler = proc_dointvec, 4170 }, 4171 { 4172 .procname = "router_solicitation_interval", 4173 .data = &ipv6_devconf.rtr_solicit_interval, 4174 .maxlen = sizeof(int), 4175 .mode = 0644, 4176 .proc_handler = proc_dointvec_jiffies, 4177 }, 4178 { 4179 .procname = "router_solicitation_delay", 4180 .data = &ipv6_devconf.rtr_solicit_delay, 4181 .maxlen = sizeof(int), 4182 .mode = 0644, 4183 .proc_handler = proc_dointvec_jiffies, 4184 }, 4185 { 4186 .procname = "force_mld_version", 4187 .data = &ipv6_devconf.force_mld_version, 4188 .maxlen = sizeof(int), 4189 .mode = 0644, 4190 .proc_handler = proc_dointvec, 4191 }, 4192 #ifdef CONFIG_IPV6_PRIVACY 4193 { 4194 .procname = "use_tempaddr", 4195 .data = &ipv6_devconf.use_tempaddr, 4196 .maxlen = sizeof(int), 4197 .mode = 0644, 4198 .proc_handler = proc_dointvec, 4199 }, 4200 { 4201 .procname = "temp_valid_lft", 4202 .data = &ipv6_devconf.temp_valid_lft, 4203 .maxlen = sizeof(int), 4204 .mode = 0644, 4205 .proc_handler = proc_dointvec, 4206 }, 4207 { 4208 .procname = "temp_prefered_lft", 4209 .data = &ipv6_devconf.temp_prefered_lft, 4210 .maxlen = sizeof(int), 4211 .mode = 0644, 4212 .proc_handler = proc_dointvec, 4213 }, 4214 { 4215 .procname = "regen_max_retry", 4216 .data = &ipv6_devconf.regen_max_retry, 4217 .maxlen = sizeof(int), 4218 .mode = 0644, 4219 .proc_handler = proc_dointvec, 4220 }, 4221 { 4222 .procname = "max_desync_factor", 4223 .data = &ipv6_devconf.max_desync_factor, 4224 .maxlen = sizeof(int), 4225 .mode = 0644, 4226 .proc_handler = proc_dointvec, 4227 }, 4228 #endif 4229 { 4230 .procname = "max_addresses", 4231 .data = &ipv6_devconf.max_addresses, 4232 .maxlen = sizeof(int), 4233 .mode = 0644, 4234 .proc_handler = proc_dointvec, 4235 }, 4236 { 4237 .procname = "accept_ra_defrtr", 4238 .data = &ipv6_devconf.accept_ra_defrtr, 4239 .maxlen = sizeof(int), 4240 .mode = 0644, 4241 .proc_handler = proc_dointvec, 4242 }, 4243 { 4244 .procname = "accept_ra_pinfo", 4245 .data = &ipv6_devconf.accept_ra_pinfo, 4246 .maxlen = sizeof(int), 4247 .mode = 0644, 4248 .proc_handler = proc_dointvec, 4249 }, 4250 #ifdef CONFIG_IPV6_ROUTER_PREF 4251 { 4252 .procname = "accept_ra_rtr_pref", 4253 .data = &ipv6_devconf.accept_ra_rtr_pref, 4254 .maxlen = sizeof(int), 4255 .mode = 0644, 4256 .proc_handler = proc_dointvec, 4257 }, 4258 { 4259 .procname = "router_probe_interval", 4260 .data = &ipv6_devconf.rtr_probe_interval, 4261 .maxlen = sizeof(int), 4262 .mode = 0644, 4263 .proc_handler = proc_dointvec_jiffies, 4264 }, 4265 #ifdef CONFIG_IPV6_ROUTE_INFO 4266 { 4267 .procname = "accept_ra_rt_info_max_plen", 4268 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4269 .maxlen = sizeof(int), 4270 .mode = 0644, 4271 .proc_handler = proc_dointvec, 4272 }, 4273 #endif 4274 #endif 4275 { 4276 .procname = "proxy_ndp", 4277 .data = &ipv6_devconf.proxy_ndp, 4278 .maxlen = sizeof(int), 4279 .mode = 0644, 4280 .proc_handler = proc_dointvec, 4281 }, 4282 { 4283 .procname = "accept_source_route", 4284 .data = &ipv6_devconf.accept_source_route, 4285 .maxlen = sizeof(int), 4286 .mode = 0644, 4287 .proc_handler = proc_dointvec, 4288 }, 4289 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4290 { 4291 .procname = "optimistic_dad", 4292 .data = &ipv6_devconf.optimistic_dad, 4293 .maxlen = sizeof(int), 4294 .mode = 0644, 4295 .proc_handler = proc_dointvec, 4296 4297 }, 4298 #endif 4299 #ifdef CONFIG_IPV6_MROUTE 4300 { 4301 .procname = "mc_forwarding", 4302 .data = &ipv6_devconf.mc_forwarding, 4303 .maxlen = sizeof(int), 4304 .mode = 0444, 4305 .proc_handler = proc_dointvec, 4306 }, 4307 #endif 4308 { 4309 .procname = "disable_ipv6", 4310 .data = &ipv6_devconf.disable_ipv6, 4311 .maxlen = sizeof(int), 4312 .mode = 0644, 4313 .proc_handler = addrconf_sysctl_disable, 4314 }, 4315 { 4316 .procname = "accept_dad", 4317 .data = &ipv6_devconf.accept_dad, 4318 .maxlen = sizeof(int), 4319 .mode = 0644, 4320 .proc_handler = proc_dointvec, 4321 }, 4322 { 4323 .procname = "force_tllao", 4324 .data = &ipv6_devconf.force_tllao, 4325 .maxlen = sizeof(int), 4326 .mode = 0644, 4327 .proc_handler = proc_dointvec 4328 }, 4329 { 4330 /* sentinel */ 4331 } 4332 }, 4333 }; 4334 4335 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4336 struct inet6_dev *idev, struct ipv6_devconf *p) 4337 { 4338 int i; 4339 struct addrconf_sysctl_table *t; 4340 4341 #define ADDRCONF_CTL_PATH_DEV 3 4342 4343 struct ctl_path addrconf_ctl_path[] = { 4344 { .procname = "net", }, 4345 { .procname = "ipv6", }, 4346 { .procname = "conf", }, 4347 { /* to be set */ }, 4348 { }, 4349 }; 4350 4351 4352 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4353 if (t == NULL) 4354 goto out; 4355 4356 for (i=0; t->addrconf_vars[i].data; i++) { 4357 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4358 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4359 t->addrconf_vars[i].extra2 = net; 4360 } 4361 4362 /* 4363 * Make a copy of dev_name, because '.procname' is regarded as const 4364 * by sysctl and we wouldn't want anyone to change it under our feet 4365 * (see SIOCSIFNAME). 4366 */ 4367 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4368 if (!t->dev_name) 4369 goto free; 4370 4371 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4372 4373 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4374 t->addrconf_vars); 4375 if (t->sysctl_header == NULL) 4376 goto free_procname; 4377 4378 p->sysctl = t; 4379 return 0; 4380 4381 free_procname: 4382 kfree(t->dev_name); 4383 free: 4384 kfree(t); 4385 out: 4386 return -ENOBUFS; 4387 } 4388 4389 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4390 { 4391 struct addrconf_sysctl_table *t; 4392 4393 if (p->sysctl == NULL) 4394 return; 4395 4396 t = p->sysctl; 4397 p->sysctl = NULL; 4398 unregister_sysctl_table(t->sysctl_header); 4399 kfree(t->dev_name); 4400 kfree(t); 4401 } 4402 4403 static void addrconf_sysctl_register(struct inet6_dev *idev) 4404 { 4405 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4406 NET_IPV6_NEIGH, "ipv6", 4407 &ndisc_ifinfo_sysctl_change); 4408 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4409 idev, &idev->cnf); 4410 } 4411 4412 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4413 { 4414 __addrconf_sysctl_unregister(&idev->cnf); 4415 neigh_sysctl_unregister(idev->nd_parms); 4416 } 4417 4418 4419 #endif 4420 4421 static int addrconf_init_net(struct net *net) 4422 { 4423 int err; 4424 struct ipv6_devconf *all, *dflt; 4425 4426 err = -ENOMEM; 4427 all = &ipv6_devconf; 4428 dflt = &ipv6_devconf_dflt; 4429 4430 if (!net_eq(net, &init_net)) { 4431 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4432 if (all == NULL) 4433 goto err_alloc_all; 4434 4435 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4436 if (dflt == NULL) 4437 goto err_alloc_dflt; 4438 } else { 4439 /* these will be inherited by all namespaces */ 4440 dflt->autoconf = ipv6_defaults.autoconf; 4441 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4442 } 4443 4444 net->ipv6.devconf_all = all; 4445 net->ipv6.devconf_dflt = dflt; 4446 4447 #ifdef CONFIG_SYSCTL 4448 err = __addrconf_sysctl_register(net, "all", NULL, all); 4449 if (err < 0) 4450 goto err_reg_all; 4451 4452 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4453 if (err < 0) 4454 goto err_reg_dflt; 4455 #endif 4456 return 0; 4457 4458 #ifdef CONFIG_SYSCTL 4459 err_reg_dflt: 4460 __addrconf_sysctl_unregister(all); 4461 err_reg_all: 4462 kfree(dflt); 4463 #endif 4464 err_alloc_dflt: 4465 kfree(all); 4466 err_alloc_all: 4467 return err; 4468 } 4469 4470 static void addrconf_exit_net(struct net *net) 4471 { 4472 #ifdef CONFIG_SYSCTL 4473 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4474 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4475 #endif 4476 if (!net_eq(net, &init_net)) { 4477 kfree(net->ipv6.devconf_dflt); 4478 kfree(net->ipv6.devconf_all); 4479 } 4480 } 4481 4482 static struct pernet_operations addrconf_ops = { 4483 .init = addrconf_init_net, 4484 .exit = addrconf_exit_net, 4485 }; 4486 4487 /* 4488 * Device notifier 4489 */ 4490 4491 int register_inet6addr_notifier(struct notifier_block *nb) 4492 { 4493 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4494 } 4495 4496 EXPORT_SYMBOL(register_inet6addr_notifier); 4497 4498 int unregister_inet6addr_notifier(struct notifier_block *nb) 4499 { 4500 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4501 } 4502 4503 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4504 4505 /* 4506 * Init / cleanup code 4507 */ 4508 4509 int __init addrconf_init(void) 4510 { 4511 int err; 4512 4513 if ((err = ipv6_addr_label_init()) < 0) { 4514 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4515 err); 4516 return err; 4517 } 4518 4519 register_pernet_subsys(&addrconf_ops); 4520 4521 /* The addrconf netdev notifier requires that loopback_dev 4522 * has it's ipv6 private information allocated and setup 4523 * before it can bring up and give link-local addresses 4524 * to other devices which are up. 4525 * 4526 * Unfortunately, loopback_dev is not necessarily the first 4527 * entry in the global dev_base list of net devices. In fact, 4528 * it is likely to be the very last entry on that list. 4529 * So this causes the notifier registry below to try and 4530 * give link-local addresses to all devices besides loopback_dev 4531 * first, then loopback_dev, which cases all the non-loopback_dev 4532 * devices to fail to get a link-local address. 4533 * 4534 * So, as a temporary fix, allocate the ipv6 structure for 4535 * loopback_dev first by hand. 4536 * Longer term, all of the dependencies ipv6 has upon the loopback 4537 * device and it being up should be removed. 4538 */ 4539 rtnl_lock(); 4540 if (!ipv6_add_dev(init_net.loopback_dev)) 4541 err = -ENOMEM; 4542 rtnl_unlock(); 4543 if (err) 4544 goto errlo; 4545 4546 register_netdevice_notifier(&ipv6_dev_notf); 4547 4548 addrconf_verify(0); 4549 4550 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4551 if (err < 0) 4552 goto errout; 4553 4554 /* Only the first call to __rtnl_register can fail */ 4555 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4556 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4557 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4558 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4559 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4560 4561 ipv6_addr_label_rtnl_register(); 4562 4563 return 0; 4564 errout: 4565 unregister_netdevice_notifier(&ipv6_dev_notf); 4566 errlo: 4567 unregister_pernet_subsys(&addrconf_ops); 4568 4569 return err; 4570 } 4571 4572 void addrconf_cleanup(void) 4573 { 4574 struct inet6_ifaddr *ifa; 4575 struct net_device *dev; 4576 int i; 4577 4578 unregister_netdevice_notifier(&ipv6_dev_notf); 4579 unregister_pernet_subsys(&addrconf_ops); 4580 4581 rtnl_lock(); 4582 4583 /* clean dev list */ 4584 for_each_netdev(&init_net, dev) { 4585 if (__in6_dev_get(dev) == NULL) 4586 continue; 4587 addrconf_ifdown(dev, 1); 4588 } 4589 addrconf_ifdown(init_net.loopback_dev, 2); 4590 4591 /* 4592 * Check hash table. 4593 */ 4594 write_lock_bh(&addrconf_hash_lock); 4595 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4596 for (ifa=inet6_addr_lst[i]; ifa; ) { 4597 struct inet6_ifaddr *bifa; 4598 4599 bifa = ifa; 4600 ifa = ifa->lst_next; 4601 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4602 /* Do not free it; something is wrong. 4603 Now we can investigate it with debugger. 4604 */ 4605 } 4606 } 4607 write_unlock_bh(&addrconf_hash_lock); 4608 4609 del_timer(&addr_chk_timer); 4610 rtnl_unlock(); 4611 } 4612