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 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <asm/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 91 /* Set to 3 to get tracing... */ 92 #define ACONF_DEBUG 2 93 94 #if ACONF_DEBUG >= 3 95 #define ADBG(x) printk x 96 #else 97 #define ADBG(x) 98 #endif 99 100 #define INFINITY_LIFE_TIME 0xFFFFFFFF 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 102 103 #ifdef CONFIG_SYSCTL 104 static void addrconf_sysctl_register(struct inet6_dev *idev); 105 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 106 #else 107 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 108 { 109 } 110 111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 112 { 113 } 114 #endif 115 116 #ifdef CONFIG_IPV6_PRIVACY 117 static int __ipv6_regen_rndid(struct inet6_dev *idev); 118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 119 static void ipv6_regen_rndid(unsigned long data); 120 121 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 122 #endif 123 124 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 125 static int ipv6_count_addresses(struct inet6_dev *idev); 126 127 /* 128 * Configured unicast address hash table 129 */ 130 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 131 static DEFINE_RWLOCK(addrconf_hash_lock); 132 133 static void addrconf_verify(unsigned long); 134 135 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 136 static DEFINE_SPINLOCK(addrconf_verify_lock); 137 138 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 139 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 140 141 static void addrconf_bonding_change(struct net_device *dev, 142 unsigned long event); 143 static int addrconf_ifdown(struct net_device *dev, int how); 144 145 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 146 static void addrconf_dad_timer(unsigned long data); 147 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 148 static void addrconf_dad_run(struct inet6_dev *idev); 149 static void addrconf_rs_timer(unsigned long data); 150 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 151 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 152 153 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 154 struct prefix_info *pinfo); 155 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 156 struct net_device *dev); 157 158 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 159 160 static struct ipv6_devconf ipv6_devconf __read_mostly = { 161 .forwarding = 0, 162 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 163 .mtu6 = IPV6_MIN_MTU, 164 .accept_ra = 1, 165 .accept_redirects = 1, 166 .autoconf = 1, 167 .force_mld_version = 0, 168 .dad_transmits = 1, 169 .rtr_solicits = MAX_RTR_SOLICITATIONS, 170 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 171 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 172 #ifdef CONFIG_IPV6_PRIVACY 173 .use_tempaddr = 0, 174 .temp_valid_lft = TEMP_VALID_LIFETIME, 175 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 176 .regen_max_retry = REGEN_MAX_RETRY, 177 .max_desync_factor = MAX_DESYNC_FACTOR, 178 #endif 179 .max_addresses = IPV6_MAX_ADDRESSES, 180 .accept_ra_defrtr = 1, 181 .accept_ra_pinfo = 1, 182 #ifdef CONFIG_IPV6_ROUTER_PREF 183 .accept_ra_rtr_pref = 1, 184 .rtr_probe_interval = 60 * HZ, 185 #ifdef CONFIG_IPV6_ROUTE_INFO 186 .accept_ra_rt_info_max_plen = 0, 187 #endif 188 #endif 189 .proxy_ndp = 0, 190 .accept_source_route = 0, /* we do not accept RH0 by default. */ 191 .disable_ipv6 = 0, 192 .accept_dad = 1, 193 }; 194 195 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 196 .forwarding = 0, 197 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 198 .mtu6 = IPV6_MIN_MTU, 199 .accept_ra = 1, 200 .accept_redirects = 1, 201 .autoconf = 1, 202 .dad_transmits = 1, 203 .rtr_solicits = MAX_RTR_SOLICITATIONS, 204 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 205 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 206 #ifdef CONFIG_IPV6_PRIVACY 207 .use_tempaddr = 0, 208 .temp_valid_lft = TEMP_VALID_LIFETIME, 209 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 210 .regen_max_retry = REGEN_MAX_RETRY, 211 .max_desync_factor = MAX_DESYNC_FACTOR, 212 #endif 213 .max_addresses = IPV6_MAX_ADDRESSES, 214 .accept_ra_defrtr = 1, 215 .accept_ra_pinfo = 1, 216 #ifdef CONFIG_IPV6_ROUTER_PREF 217 .accept_ra_rtr_pref = 1, 218 .rtr_probe_interval = 60 * HZ, 219 #ifdef CONFIG_IPV6_ROUTE_INFO 220 .accept_ra_rt_info_max_plen = 0, 221 #endif 222 #endif 223 .proxy_ndp = 0, 224 .accept_source_route = 0, /* we do not accept RH0 by default. */ 225 .disable_ipv6 = 0, 226 .accept_dad = 1, 227 }; 228 229 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 230 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 231 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 232 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 233 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 234 235 /* Check if a valid qdisc is available */ 236 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 237 { 238 return !qdisc_tx_is_noop(dev); 239 } 240 241 /* Check if a route is valid prefix route */ 242 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 243 { 244 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0); 245 } 246 247 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 248 { 249 if (del_timer(&ifp->timer)) 250 __in6_ifa_put(ifp); 251 } 252 253 enum addrconf_timer_t 254 { 255 AC_NONE, 256 AC_DAD, 257 AC_RS, 258 }; 259 260 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 261 enum addrconf_timer_t what, 262 unsigned long when) 263 { 264 if (!del_timer(&ifp->timer)) 265 in6_ifa_hold(ifp); 266 267 switch (what) { 268 case AC_DAD: 269 ifp->timer.function = addrconf_dad_timer; 270 break; 271 case AC_RS: 272 ifp->timer.function = addrconf_rs_timer; 273 break; 274 default:; 275 } 276 ifp->timer.expires = jiffies + when; 277 add_timer(&ifp->timer); 278 } 279 280 static int snmp6_alloc_dev(struct inet6_dev *idev) 281 { 282 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 283 sizeof(struct ipstats_mib)) < 0) 284 goto err_ip; 285 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6, 286 sizeof(struct icmpv6_mib)) < 0) 287 goto err_icmp; 288 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg, 289 sizeof(struct icmpv6msg_mib)) < 0) 290 goto err_icmpmsg; 291 292 return 0; 293 294 err_icmpmsg: 295 snmp_mib_free((void __percpu **)idev->stats.icmpv6); 296 err_icmp: 297 snmp_mib_free((void __percpu **)idev->stats.ipv6); 298 err_ip: 299 return -ENOMEM; 300 } 301 302 static void snmp6_free_dev(struct inet6_dev *idev) 303 { 304 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg); 305 snmp_mib_free((void __percpu **)idev->stats.icmpv6); 306 snmp_mib_free((void __percpu **)idev->stats.ipv6); 307 } 308 309 /* Nobody refers to this device, we may destroy it. */ 310 311 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 312 { 313 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 314 kfree(idev); 315 } 316 317 void in6_dev_finish_destroy(struct inet6_dev *idev) 318 { 319 struct net_device *dev = idev->dev; 320 321 WARN_ON(idev->addr_list != NULL); 322 WARN_ON(idev->mc_list != NULL); 323 324 #ifdef NET_REFCNT_DEBUG 325 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 326 #endif 327 dev_put(dev); 328 if (!idev->dead) { 329 printk("Freeing alive inet6 device %p\n", idev); 330 return; 331 } 332 snmp6_free_dev(idev); 333 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 334 } 335 336 EXPORT_SYMBOL(in6_dev_finish_destroy); 337 338 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 339 { 340 struct inet6_dev *ndev; 341 342 ASSERT_RTNL(); 343 344 if (dev->mtu < IPV6_MIN_MTU) 345 return NULL; 346 347 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 348 349 if (ndev == NULL) 350 return NULL; 351 352 rwlock_init(&ndev->lock); 353 ndev->dev = dev; 354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 355 ndev->cnf.mtu6 = dev->mtu; 356 ndev->cnf.sysctl = NULL; 357 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 358 if (ndev->nd_parms == NULL) { 359 kfree(ndev); 360 return NULL; 361 } 362 if (ndev->cnf.forwarding) 363 dev_disable_lro(dev); 364 /* We refer to the device */ 365 dev_hold(dev); 366 367 if (snmp6_alloc_dev(ndev) < 0) { 368 ADBG((KERN_WARNING 369 "%s(): cannot allocate memory for statistics; dev=%s.\n", 370 __func__, dev->name)); 371 neigh_parms_release(&nd_tbl, ndev->nd_parms); 372 ndev->dead = 1; 373 in6_dev_finish_destroy(ndev); 374 return NULL; 375 } 376 377 if (snmp6_register_dev(ndev) < 0) { 378 ADBG((KERN_WARNING 379 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 380 __func__, dev->name)); 381 neigh_parms_release(&nd_tbl, ndev->nd_parms); 382 ndev->dead = 1; 383 in6_dev_finish_destroy(ndev); 384 return NULL; 385 } 386 387 /* One reference from device. We must do this before 388 * we invoke __ipv6_regen_rndid(). 389 */ 390 in6_dev_hold(ndev); 391 392 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 393 ndev->cnf.accept_dad = -1; 394 395 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 396 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 397 printk(KERN_INFO 398 "%s: Disabled Multicast RS\n", 399 dev->name); 400 ndev->cnf.rtr_solicits = 0; 401 } 402 #endif 403 404 #ifdef CONFIG_IPV6_PRIVACY 405 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 406 if ((dev->flags&IFF_LOOPBACK) || 407 dev->type == ARPHRD_TUNNEL || 408 dev->type == ARPHRD_TUNNEL6 || 409 dev->type == ARPHRD_SIT || 410 dev->type == ARPHRD_NONE) { 411 printk(KERN_INFO 412 "%s: Disabled Privacy Extensions\n", 413 dev->name); 414 ndev->cnf.use_tempaddr = -1; 415 } else { 416 in6_dev_hold(ndev); 417 ipv6_regen_rndid((unsigned long) ndev); 418 } 419 #endif 420 421 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 422 ndev->if_flags |= IF_READY; 423 424 ipv6_mc_init_dev(ndev); 425 ndev->tstamp = jiffies; 426 addrconf_sysctl_register(ndev); 427 /* protected by rtnl_lock */ 428 rcu_assign_pointer(dev->ip6_ptr, ndev); 429 430 /* Join all-node multicast group */ 431 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 432 433 return ndev; 434 } 435 436 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 437 { 438 struct inet6_dev *idev; 439 440 ASSERT_RTNL(); 441 442 if ((idev = __in6_dev_get(dev)) == NULL) { 443 if ((idev = ipv6_add_dev(dev)) == NULL) 444 return NULL; 445 } 446 447 if (dev->flags&IFF_UP) 448 ipv6_mc_up(idev); 449 return idev; 450 } 451 452 #ifdef CONFIG_SYSCTL 453 static void dev_forward_change(struct inet6_dev *idev) 454 { 455 struct net_device *dev; 456 struct inet6_ifaddr *ifa; 457 458 if (!idev) 459 return; 460 dev = idev->dev; 461 if (idev->cnf.forwarding) 462 dev_disable_lro(dev); 463 if (dev && (dev->flags & IFF_MULTICAST)) { 464 if (idev->cnf.forwarding) 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 466 else 467 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 468 } 469 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 470 if (ifa->flags&IFA_F_TENTATIVE) 471 continue; 472 if (idev->cnf.forwarding) 473 addrconf_join_anycast(ifa); 474 else 475 addrconf_leave_anycast(ifa); 476 } 477 } 478 479 480 static void addrconf_forward_change(struct net *net, __s32 newf) 481 { 482 struct net_device *dev; 483 struct inet6_dev *idev; 484 485 rcu_read_lock(); 486 for_each_netdev_rcu(net, dev) { 487 idev = __in6_dev_get(dev); 488 if (idev) { 489 int changed = (!idev->cnf.forwarding) ^ (!newf); 490 idev->cnf.forwarding = newf; 491 if (changed) 492 dev_forward_change(idev); 493 } 494 } 495 rcu_read_unlock(); 496 } 497 498 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 499 { 500 struct net *net; 501 502 net = (struct net *)table->extra2; 503 if (p == &net->ipv6.devconf_dflt->forwarding) 504 return 0; 505 506 if (!rtnl_trylock()) { 507 /* Restore the original values before restarting */ 508 *p = old; 509 return restart_syscall(); 510 } 511 512 if (p == &net->ipv6.devconf_all->forwarding) { 513 __s32 newf = net->ipv6.devconf_all->forwarding; 514 net->ipv6.devconf_dflt->forwarding = newf; 515 addrconf_forward_change(net, newf); 516 } else if ((!*p) ^ (!old)) 517 dev_forward_change((struct inet6_dev *)table->extra1); 518 rtnl_unlock(); 519 520 if (*p) 521 rt6_purge_dflt_routers(net); 522 return 1; 523 } 524 #endif 525 526 /* Nobody refers to this ifaddr, destroy it */ 527 528 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 529 { 530 WARN_ON(ifp->if_next != NULL); 531 WARN_ON(ifp->lst_next != NULL); 532 533 #ifdef NET_REFCNT_DEBUG 534 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 535 #endif 536 537 in6_dev_put(ifp->idev); 538 539 if (del_timer(&ifp->timer)) 540 printk("Timer is still running, when freeing ifa=%p\n", ifp); 541 542 if (!ifp->dead) { 543 printk("Freeing alive inet6 address %p\n", ifp); 544 return; 545 } 546 dst_release(&ifp->rt->u.dst); 547 548 kfree(ifp); 549 } 550 551 static void 552 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 553 { 554 struct inet6_ifaddr *ifa, **ifap; 555 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 556 557 /* 558 * Each device address list is sorted in order of scope - 559 * global before linklocal. 560 */ 561 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 562 ifap = &ifa->if_next) { 563 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 564 break; 565 } 566 567 ifp->if_next = *ifap; 568 *ifap = ifp; 569 } 570 571 /* 572 * Hash function taken from net_alias.c 573 */ 574 static u8 ipv6_addr_hash(const struct in6_addr *addr) 575 { 576 __u32 word; 577 578 /* 579 * We perform the hash function over the last 64 bits of the address 580 * This will include the IEEE address token on links that support it. 581 */ 582 583 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 584 word ^= (word >> 16); 585 word ^= (word >> 8); 586 587 return ((word ^ (word >> 4)) & 0x0f); 588 } 589 590 /* On success it returns ifp with increased reference count */ 591 592 static struct inet6_ifaddr * 593 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 594 int scope, u32 flags) 595 { 596 struct inet6_ifaddr *ifa = NULL; 597 struct rt6_info *rt; 598 int hash; 599 int err = 0; 600 int addr_type = ipv6_addr_type(addr); 601 602 if (addr_type == IPV6_ADDR_ANY || 603 addr_type & IPV6_ADDR_MULTICAST || 604 (!(idev->dev->flags & IFF_LOOPBACK) && 605 addr_type & IPV6_ADDR_LOOPBACK)) 606 return ERR_PTR(-EADDRNOTAVAIL); 607 608 rcu_read_lock_bh(); 609 if (idev->dead) { 610 err = -ENODEV; /*XXX*/ 611 goto out2; 612 } 613 614 if (idev->cnf.disable_ipv6) { 615 err = -EACCES; 616 goto out2; 617 } 618 619 write_lock(&addrconf_hash_lock); 620 621 /* Ignore adding duplicate addresses on an interface */ 622 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 623 ADBG(("ipv6_add_addr: already assigned\n")); 624 err = -EEXIST; 625 goto out; 626 } 627 628 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 629 630 if (ifa == NULL) { 631 ADBG(("ipv6_add_addr: malloc failed\n")); 632 err = -ENOBUFS; 633 goto out; 634 } 635 636 rt = addrconf_dst_alloc(idev, addr, 0); 637 if (IS_ERR(rt)) { 638 err = PTR_ERR(rt); 639 goto out; 640 } 641 642 ipv6_addr_copy(&ifa->addr, addr); 643 644 spin_lock_init(&ifa->lock); 645 init_timer(&ifa->timer); 646 ifa->timer.data = (unsigned long) ifa; 647 ifa->scope = scope; 648 ifa->prefix_len = pfxlen; 649 ifa->flags = flags | IFA_F_TENTATIVE; 650 ifa->cstamp = ifa->tstamp = jiffies; 651 652 ifa->rt = rt; 653 654 /* 655 * part one of RFC 4429, section 3.3 656 * We should not configure an address as 657 * optimistic if we do not yet know the link 658 * layer address of our nexhop router 659 */ 660 661 if (rt->rt6i_nexthop == NULL) 662 ifa->flags &= ~IFA_F_OPTIMISTIC; 663 664 ifa->idev = idev; 665 in6_dev_hold(idev); 666 /* For caller */ 667 in6_ifa_hold(ifa); 668 669 /* Add to big hash table */ 670 hash = ipv6_addr_hash(addr); 671 672 ifa->lst_next = inet6_addr_lst[hash]; 673 inet6_addr_lst[hash] = ifa; 674 in6_ifa_hold(ifa); 675 write_unlock(&addrconf_hash_lock); 676 677 write_lock(&idev->lock); 678 /* Add to inet6_dev unicast addr list. */ 679 ipv6_link_dev_addr(idev, ifa); 680 681 #ifdef CONFIG_IPV6_PRIVACY 682 if (ifa->flags&IFA_F_TEMPORARY) { 683 ifa->tmp_next = idev->tempaddr_list; 684 idev->tempaddr_list = ifa; 685 in6_ifa_hold(ifa); 686 } 687 #endif 688 689 in6_ifa_hold(ifa); 690 write_unlock(&idev->lock); 691 out2: 692 rcu_read_unlock_bh(); 693 694 if (likely(err == 0)) 695 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 696 else { 697 kfree(ifa); 698 ifa = ERR_PTR(err); 699 } 700 701 return ifa; 702 out: 703 write_unlock(&addrconf_hash_lock); 704 goto out2; 705 } 706 707 /* This function wants to get referenced ifp and releases it before return */ 708 709 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 710 { 711 struct inet6_ifaddr *ifa, **ifap; 712 struct inet6_dev *idev = ifp->idev; 713 int hash; 714 int deleted = 0, onlink = 0; 715 unsigned long expires = jiffies; 716 717 hash = ipv6_addr_hash(&ifp->addr); 718 719 ifp->dead = 1; 720 721 write_lock_bh(&addrconf_hash_lock); 722 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 723 ifap = &ifa->lst_next) { 724 if (ifa == ifp) { 725 *ifap = ifa->lst_next; 726 __in6_ifa_put(ifp); 727 ifa->lst_next = NULL; 728 break; 729 } 730 } 731 write_unlock_bh(&addrconf_hash_lock); 732 733 write_lock_bh(&idev->lock); 734 #ifdef CONFIG_IPV6_PRIVACY 735 if (ifp->flags&IFA_F_TEMPORARY) { 736 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 737 ifap = &ifa->tmp_next) { 738 if (ifa == ifp) { 739 *ifap = ifa->tmp_next; 740 if (ifp->ifpub) { 741 in6_ifa_put(ifp->ifpub); 742 ifp->ifpub = NULL; 743 } 744 __in6_ifa_put(ifp); 745 ifa->tmp_next = NULL; 746 break; 747 } 748 } 749 } 750 #endif 751 752 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 753 if (ifa == ifp) { 754 *ifap = ifa->if_next; 755 __in6_ifa_put(ifp); 756 ifa->if_next = NULL; 757 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 758 break; 759 deleted = 1; 760 continue; 761 } else if (ifp->flags & IFA_F_PERMANENT) { 762 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 763 ifp->prefix_len)) { 764 if (ifa->flags & IFA_F_PERMANENT) { 765 onlink = 1; 766 if (deleted) 767 break; 768 } else { 769 unsigned long lifetime; 770 771 if (!onlink) 772 onlink = -1; 773 774 spin_lock(&ifa->lock); 775 776 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 777 /* 778 * Note: Because this address is 779 * not permanent, lifetime < 780 * LONG_MAX / HZ here. 781 */ 782 if (time_before(expires, 783 ifa->tstamp + lifetime * HZ)) 784 expires = ifa->tstamp + lifetime * HZ; 785 spin_unlock(&ifa->lock); 786 } 787 } 788 } 789 ifap = &ifa->if_next; 790 } 791 write_unlock_bh(&idev->lock); 792 793 addrconf_del_timer(ifp); 794 795 ipv6_ifa_notify(RTM_DELADDR, ifp); 796 797 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 798 799 /* 800 * Purge or update corresponding prefix 801 * 802 * 1) we don't purge prefix here if address was not permanent. 803 * prefix is managed by its own lifetime. 804 * 2) if there're no addresses, delete prefix. 805 * 3) if there're still other permanent address(es), 806 * corresponding prefix is still permanent. 807 * 4) otherwise, update prefix lifetime to the 808 * longest valid lifetime among the corresponding 809 * addresses on the device. 810 * Note: subsequent RA will update lifetime. 811 * 812 * --yoshfuji 813 */ 814 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 815 struct in6_addr prefix; 816 struct rt6_info *rt; 817 struct net *net = dev_net(ifp->idev->dev); 818 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 819 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 820 821 if (rt && addrconf_is_prefix_route(rt)) { 822 if (onlink == 0) { 823 ip6_del_rt(rt); 824 rt = NULL; 825 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 826 rt->rt6i_expires = expires; 827 rt->rt6i_flags |= RTF_EXPIRES; 828 } 829 } 830 dst_release(&rt->u.dst); 831 } 832 833 in6_ifa_put(ifp); 834 } 835 836 #ifdef CONFIG_IPV6_PRIVACY 837 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 838 { 839 struct inet6_dev *idev = ifp->idev; 840 struct in6_addr addr, *tmpaddr; 841 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 842 unsigned long regen_advance; 843 int tmp_plen; 844 int ret = 0; 845 int max_addresses; 846 u32 addr_flags; 847 848 write_lock(&idev->lock); 849 if (ift) { 850 spin_lock_bh(&ift->lock); 851 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 852 spin_unlock_bh(&ift->lock); 853 tmpaddr = &addr; 854 } else { 855 tmpaddr = NULL; 856 } 857 retry: 858 in6_dev_hold(idev); 859 if (idev->cnf.use_tempaddr <= 0) { 860 write_unlock(&idev->lock); 861 printk(KERN_INFO 862 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 863 in6_dev_put(idev); 864 ret = -1; 865 goto out; 866 } 867 spin_lock_bh(&ifp->lock); 868 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 869 idev->cnf.use_tempaddr = -1; /*XXX*/ 870 spin_unlock_bh(&ifp->lock); 871 write_unlock(&idev->lock); 872 printk(KERN_WARNING 873 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 874 in6_dev_put(idev); 875 ret = -1; 876 goto out; 877 } 878 in6_ifa_hold(ifp); 879 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 880 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 881 spin_unlock_bh(&ifp->lock); 882 write_unlock(&idev->lock); 883 printk(KERN_WARNING 884 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 885 in6_ifa_put(ifp); 886 in6_dev_put(idev); 887 ret = -1; 888 goto out; 889 } 890 memcpy(&addr.s6_addr[8], idev->rndid, 8); 891 tmp_valid_lft = min_t(__u32, 892 ifp->valid_lft, 893 idev->cnf.temp_valid_lft); 894 tmp_prefered_lft = min_t(__u32, 895 ifp->prefered_lft, 896 idev->cnf.temp_prefered_lft - desync_factor / HZ); 897 tmp_plen = ifp->prefix_len; 898 max_addresses = idev->cnf.max_addresses; 899 tmp_cstamp = ifp->cstamp; 900 tmp_tstamp = ifp->tstamp; 901 spin_unlock_bh(&ifp->lock); 902 903 regen_advance = idev->cnf.regen_max_retry * 904 idev->cnf.dad_transmits * 905 idev->nd_parms->retrans_time / HZ; 906 write_unlock(&idev->lock); 907 908 /* A temporary address is created only if this calculated Preferred 909 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 910 * an implementation must not create a temporary address with a zero 911 * Preferred Lifetime. 912 */ 913 if (tmp_prefered_lft <= regen_advance) { 914 in6_ifa_put(ifp); 915 in6_dev_put(idev); 916 ret = -1; 917 goto out; 918 } 919 920 addr_flags = IFA_F_TEMPORARY; 921 /* set in addrconf_prefix_rcv() */ 922 if (ifp->flags & IFA_F_OPTIMISTIC) 923 addr_flags |= IFA_F_OPTIMISTIC; 924 925 ift = !max_addresses || 926 ipv6_count_addresses(idev) < max_addresses ? 927 ipv6_add_addr(idev, &addr, tmp_plen, 928 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 929 addr_flags) : NULL; 930 if (!ift || IS_ERR(ift)) { 931 in6_ifa_put(ifp); 932 in6_dev_put(idev); 933 printk(KERN_INFO 934 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 935 tmpaddr = &addr; 936 write_lock(&idev->lock); 937 goto retry; 938 } 939 940 spin_lock_bh(&ift->lock); 941 ift->ifpub = ifp; 942 ift->valid_lft = tmp_valid_lft; 943 ift->prefered_lft = tmp_prefered_lft; 944 ift->cstamp = tmp_cstamp; 945 ift->tstamp = tmp_tstamp; 946 spin_unlock_bh(&ift->lock); 947 948 addrconf_dad_start(ift, 0); 949 in6_ifa_put(ift); 950 in6_dev_put(idev); 951 out: 952 return ret; 953 } 954 #endif 955 956 /* 957 * Choose an appropriate source address (RFC3484) 958 */ 959 enum { 960 IPV6_SADDR_RULE_INIT = 0, 961 IPV6_SADDR_RULE_LOCAL, 962 IPV6_SADDR_RULE_SCOPE, 963 IPV6_SADDR_RULE_PREFERRED, 964 #ifdef CONFIG_IPV6_MIP6 965 IPV6_SADDR_RULE_HOA, 966 #endif 967 IPV6_SADDR_RULE_OIF, 968 IPV6_SADDR_RULE_LABEL, 969 #ifdef CONFIG_IPV6_PRIVACY 970 IPV6_SADDR_RULE_PRIVACY, 971 #endif 972 IPV6_SADDR_RULE_ORCHID, 973 IPV6_SADDR_RULE_PREFIX, 974 IPV6_SADDR_RULE_MAX 975 }; 976 977 struct ipv6_saddr_score { 978 int rule; 979 int addr_type; 980 struct inet6_ifaddr *ifa; 981 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 982 int scopedist; 983 int matchlen; 984 }; 985 986 struct ipv6_saddr_dst { 987 const struct in6_addr *addr; 988 int ifindex; 989 int scope; 990 int label; 991 unsigned int prefs; 992 }; 993 994 static inline int ipv6_saddr_preferred(int type) 995 { 996 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 997 return 1; 998 return 0; 999 } 1000 1001 static int ipv6_get_saddr_eval(struct net *net, 1002 struct ipv6_saddr_score *score, 1003 struct ipv6_saddr_dst *dst, 1004 int i) 1005 { 1006 int ret; 1007 1008 if (i <= score->rule) { 1009 switch (i) { 1010 case IPV6_SADDR_RULE_SCOPE: 1011 ret = score->scopedist; 1012 break; 1013 case IPV6_SADDR_RULE_PREFIX: 1014 ret = score->matchlen; 1015 break; 1016 default: 1017 ret = !!test_bit(i, score->scorebits); 1018 } 1019 goto out; 1020 } 1021 1022 switch (i) { 1023 case IPV6_SADDR_RULE_INIT: 1024 /* Rule 0: remember if hiscore is not ready yet */ 1025 ret = !!score->ifa; 1026 break; 1027 case IPV6_SADDR_RULE_LOCAL: 1028 /* Rule 1: Prefer same address */ 1029 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1030 break; 1031 case IPV6_SADDR_RULE_SCOPE: 1032 /* Rule 2: Prefer appropriate scope 1033 * 1034 * ret 1035 * ^ 1036 * -1 | d 15 1037 * ---+--+-+---> scope 1038 * | 1039 * | d is scope of the destination. 1040 * B-d | \ 1041 * | \ <- smaller scope is better if 1042 * B-15 | \ if scope is enough for destinaion. 1043 * | ret = B - scope (-1 <= scope >= d <= 15). 1044 * d-C-1 | / 1045 * |/ <- greater is better 1046 * -C / if scope is not enough for destination. 1047 * /| ret = scope - C (-1 <= d < scope <= 15). 1048 * 1049 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1050 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1051 * Assume B = 0 and we get C > 29. 1052 */ 1053 ret = __ipv6_addr_src_scope(score->addr_type); 1054 if (ret >= dst->scope) 1055 ret = -ret; 1056 else 1057 ret -= 128; /* 30 is enough */ 1058 score->scopedist = ret; 1059 break; 1060 case IPV6_SADDR_RULE_PREFERRED: 1061 /* Rule 3: Avoid deprecated and optimistic addresses */ 1062 ret = ipv6_saddr_preferred(score->addr_type) || 1063 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1064 break; 1065 #ifdef CONFIG_IPV6_MIP6 1066 case IPV6_SADDR_RULE_HOA: 1067 { 1068 /* Rule 4: Prefer home address */ 1069 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1070 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1071 break; 1072 } 1073 #endif 1074 case IPV6_SADDR_RULE_OIF: 1075 /* Rule 5: Prefer outgoing interface */ 1076 ret = (!dst->ifindex || 1077 dst->ifindex == score->ifa->idev->dev->ifindex); 1078 break; 1079 case IPV6_SADDR_RULE_LABEL: 1080 /* Rule 6: Prefer matching label */ 1081 ret = ipv6_addr_label(net, 1082 &score->ifa->addr, score->addr_type, 1083 score->ifa->idev->dev->ifindex) == dst->label; 1084 break; 1085 #ifdef CONFIG_IPV6_PRIVACY 1086 case IPV6_SADDR_RULE_PRIVACY: 1087 { 1088 /* Rule 7: Prefer public address 1089 * Note: prefer temprary address if use_tempaddr >= 2 1090 */ 1091 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1092 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1093 score->ifa->idev->cnf.use_tempaddr >= 2; 1094 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1095 break; 1096 } 1097 #endif 1098 case IPV6_SADDR_RULE_ORCHID: 1099 /* Rule 8-: Prefer ORCHID vs ORCHID or 1100 * non-ORCHID vs non-ORCHID 1101 */ 1102 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1103 ipv6_addr_orchid(dst->addr)); 1104 break; 1105 case IPV6_SADDR_RULE_PREFIX: 1106 /* Rule 8: Use longest matching prefix */ 1107 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1108 dst->addr); 1109 break; 1110 default: 1111 ret = 0; 1112 } 1113 1114 if (ret) 1115 __set_bit(i, score->scorebits); 1116 score->rule = i; 1117 out: 1118 return ret; 1119 } 1120 1121 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1122 const struct in6_addr *daddr, unsigned int prefs, 1123 struct in6_addr *saddr) 1124 { 1125 struct ipv6_saddr_score scores[2], 1126 *score = &scores[0], *hiscore = &scores[1]; 1127 struct ipv6_saddr_dst dst; 1128 struct net_device *dev; 1129 int dst_type; 1130 1131 dst_type = __ipv6_addr_type(daddr); 1132 dst.addr = daddr; 1133 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1134 dst.scope = __ipv6_addr_src_scope(dst_type); 1135 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1136 dst.prefs = prefs; 1137 1138 hiscore->rule = -1; 1139 hiscore->ifa = NULL; 1140 1141 rcu_read_lock(); 1142 1143 for_each_netdev_rcu(net, dev) { 1144 struct inet6_dev *idev; 1145 1146 /* Candidate Source Address (section 4) 1147 * - multicast and link-local destination address, 1148 * the set of candidate source address MUST only 1149 * include addresses assigned to interfaces 1150 * belonging to the same link as the outgoing 1151 * interface. 1152 * (- For site-local destination addresses, the 1153 * set of candidate source addresses MUST only 1154 * include addresses assigned to interfaces 1155 * belonging to the same site as the outgoing 1156 * interface.) 1157 */ 1158 if (((dst_type & IPV6_ADDR_MULTICAST) || 1159 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1160 dst.ifindex && dev->ifindex != dst.ifindex) 1161 continue; 1162 1163 idev = __in6_dev_get(dev); 1164 if (!idev) 1165 continue; 1166 1167 read_lock_bh(&idev->lock); 1168 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1169 int i; 1170 1171 /* 1172 * - Tentative Address (RFC2462 section 5.4) 1173 * - A tentative address is not considered 1174 * "assigned to an interface" in the traditional 1175 * sense, unless it is also flagged as optimistic. 1176 * - Candidate Source Address (section 4) 1177 * - In any case, anycast addresses, multicast 1178 * addresses, and the unspecified address MUST 1179 * NOT be included in a candidate set. 1180 */ 1181 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1182 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1183 continue; 1184 1185 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1186 1187 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1188 score->addr_type & IPV6_ADDR_MULTICAST)) { 1189 LIMIT_NETDEBUG(KERN_DEBUG 1190 "ADDRCONF: unspecified / multicast address " 1191 "assigned as unicast address on %s", 1192 dev->name); 1193 continue; 1194 } 1195 1196 score->rule = -1; 1197 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1198 1199 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1200 int minihiscore, miniscore; 1201 1202 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1203 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1204 1205 if (minihiscore > miniscore) { 1206 if (i == IPV6_SADDR_RULE_SCOPE && 1207 score->scopedist > 0) { 1208 /* 1209 * special case: 1210 * each remaining entry 1211 * has too small (not enough) 1212 * scope, because ifa entries 1213 * are sorted by their scope 1214 * values. 1215 */ 1216 goto try_nextdev; 1217 } 1218 break; 1219 } else if (minihiscore < miniscore) { 1220 if (hiscore->ifa) 1221 in6_ifa_put(hiscore->ifa); 1222 1223 in6_ifa_hold(score->ifa); 1224 1225 swap(hiscore, score); 1226 1227 /* restore our iterator */ 1228 score->ifa = hiscore->ifa; 1229 1230 break; 1231 } 1232 } 1233 } 1234 try_nextdev: 1235 read_unlock_bh(&idev->lock); 1236 } 1237 rcu_read_unlock(); 1238 1239 if (!hiscore->ifa) 1240 return -EADDRNOTAVAIL; 1241 1242 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1243 in6_ifa_put(hiscore->ifa); 1244 return 0; 1245 } 1246 1247 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1248 1249 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1250 unsigned char banned_flags) 1251 { 1252 struct inet6_dev *idev; 1253 int err = -EADDRNOTAVAIL; 1254 1255 rcu_read_lock(); 1256 if ((idev = __in6_dev_get(dev)) != NULL) { 1257 struct inet6_ifaddr *ifp; 1258 1259 read_lock_bh(&idev->lock); 1260 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1261 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1262 ipv6_addr_copy(addr, &ifp->addr); 1263 err = 0; 1264 break; 1265 } 1266 } 1267 read_unlock_bh(&idev->lock); 1268 } 1269 rcu_read_unlock(); 1270 return err; 1271 } 1272 1273 static int ipv6_count_addresses(struct inet6_dev *idev) 1274 { 1275 int cnt = 0; 1276 struct inet6_ifaddr *ifp; 1277 1278 read_lock_bh(&idev->lock); 1279 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1280 cnt++; 1281 read_unlock_bh(&idev->lock); 1282 return cnt; 1283 } 1284 1285 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1286 struct net_device *dev, int strict) 1287 { 1288 struct inet6_ifaddr * ifp; 1289 u8 hash = ipv6_addr_hash(addr); 1290 1291 read_lock_bh(&addrconf_hash_lock); 1292 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1293 if (!net_eq(dev_net(ifp->idev->dev), net)) 1294 continue; 1295 if (ipv6_addr_equal(&ifp->addr, addr) && 1296 !(ifp->flags&IFA_F_TENTATIVE)) { 1297 if (dev == NULL || ifp->idev->dev == dev || 1298 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1299 break; 1300 } 1301 } 1302 read_unlock_bh(&addrconf_hash_lock); 1303 return ifp != NULL; 1304 } 1305 EXPORT_SYMBOL(ipv6_chk_addr); 1306 1307 static 1308 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1309 struct net_device *dev) 1310 { 1311 struct inet6_ifaddr * ifp; 1312 u8 hash = ipv6_addr_hash(addr); 1313 1314 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1315 if (!net_eq(dev_net(ifp->idev->dev), net)) 1316 continue; 1317 if (ipv6_addr_equal(&ifp->addr, addr)) { 1318 if (dev == NULL || ifp->idev->dev == dev) 1319 break; 1320 } 1321 } 1322 return ifp != NULL; 1323 } 1324 1325 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1326 { 1327 struct inet6_dev *idev; 1328 struct inet6_ifaddr *ifa; 1329 int onlink; 1330 1331 onlink = 0; 1332 rcu_read_lock(); 1333 idev = __in6_dev_get(dev); 1334 if (idev) { 1335 read_lock_bh(&idev->lock); 1336 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1337 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1338 ifa->prefix_len); 1339 if (onlink) 1340 break; 1341 } 1342 read_unlock_bh(&idev->lock); 1343 } 1344 rcu_read_unlock(); 1345 return onlink; 1346 } 1347 1348 EXPORT_SYMBOL(ipv6_chk_prefix); 1349 1350 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1351 struct net_device *dev, int strict) 1352 { 1353 struct inet6_ifaddr * ifp; 1354 u8 hash = ipv6_addr_hash(addr); 1355 1356 read_lock_bh(&addrconf_hash_lock); 1357 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1358 if (!net_eq(dev_net(ifp->idev->dev), net)) 1359 continue; 1360 if (ipv6_addr_equal(&ifp->addr, addr)) { 1361 if (dev == NULL || ifp->idev->dev == dev || 1362 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1363 in6_ifa_hold(ifp); 1364 break; 1365 } 1366 } 1367 } 1368 read_unlock_bh(&addrconf_hash_lock); 1369 1370 return ifp; 1371 } 1372 1373 /* Gets referenced address, destroys ifaddr */ 1374 1375 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1376 { 1377 if (ifp->flags&IFA_F_PERMANENT) { 1378 spin_lock_bh(&ifp->lock); 1379 addrconf_del_timer(ifp); 1380 ifp->flags |= IFA_F_TENTATIVE; 1381 if (dad_failed) 1382 ifp->flags |= IFA_F_DADFAILED; 1383 spin_unlock_bh(&ifp->lock); 1384 if (dad_failed) 1385 ipv6_ifa_notify(0, ifp); 1386 in6_ifa_put(ifp); 1387 #ifdef CONFIG_IPV6_PRIVACY 1388 } else if (ifp->flags&IFA_F_TEMPORARY) { 1389 struct inet6_ifaddr *ifpub; 1390 spin_lock_bh(&ifp->lock); 1391 ifpub = ifp->ifpub; 1392 if (ifpub) { 1393 in6_ifa_hold(ifpub); 1394 spin_unlock_bh(&ifp->lock); 1395 ipv6_create_tempaddr(ifpub, ifp); 1396 in6_ifa_put(ifpub); 1397 } else { 1398 spin_unlock_bh(&ifp->lock); 1399 } 1400 ipv6_del_addr(ifp); 1401 #endif 1402 } else 1403 ipv6_del_addr(ifp); 1404 } 1405 1406 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1407 { 1408 struct inet6_dev *idev = ifp->idev; 1409 1410 if (net_ratelimit()) 1411 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1412 ifp->idev->dev->name, &ifp->addr); 1413 1414 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1415 struct in6_addr addr; 1416 1417 addr.s6_addr32[0] = htonl(0xfe800000); 1418 addr.s6_addr32[1] = 0; 1419 1420 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1421 ipv6_addr_equal(&ifp->addr, &addr)) { 1422 /* DAD failed for link-local based on MAC address */ 1423 idev->cnf.disable_ipv6 = 1; 1424 1425 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1426 ifp->idev->dev->name); 1427 } 1428 } 1429 1430 addrconf_dad_stop(ifp, 1); 1431 } 1432 1433 /* Join to solicited addr multicast group. */ 1434 1435 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1436 { 1437 struct in6_addr maddr; 1438 1439 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1440 return; 1441 1442 addrconf_addr_solict_mult(addr, &maddr); 1443 ipv6_dev_mc_inc(dev, &maddr); 1444 } 1445 1446 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1447 { 1448 struct in6_addr maddr; 1449 1450 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1451 return; 1452 1453 addrconf_addr_solict_mult(addr, &maddr); 1454 __ipv6_dev_mc_dec(idev, &maddr); 1455 } 1456 1457 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1458 { 1459 struct in6_addr addr; 1460 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1461 if (ipv6_addr_any(&addr)) 1462 return; 1463 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1464 } 1465 1466 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1467 { 1468 struct in6_addr addr; 1469 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1470 if (ipv6_addr_any(&addr)) 1471 return; 1472 __ipv6_dev_ac_dec(ifp->idev, &addr); 1473 } 1474 1475 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1476 { 1477 if (dev->addr_len != ETH_ALEN) 1478 return -1; 1479 memcpy(eui, dev->dev_addr, 3); 1480 memcpy(eui + 5, dev->dev_addr + 3, 3); 1481 1482 /* 1483 * The zSeries OSA network cards can be shared among various 1484 * OS instances, but the OSA cards have only one MAC address. 1485 * This leads to duplicate address conflicts in conjunction 1486 * with IPv6 if more than one instance uses the same card. 1487 * 1488 * The driver for these cards can deliver a unique 16-bit 1489 * identifier for each instance sharing the same card. It is 1490 * placed instead of 0xFFFE in the interface identifier. The 1491 * "u" bit of the interface identifier is not inverted in this 1492 * case. Hence the resulting interface identifier has local 1493 * scope according to RFC2373. 1494 */ 1495 if (dev->dev_id) { 1496 eui[3] = (dev->dev_id >> 8) & 0xFF; 1497 eui[4] = dev->dev_id & 0xFF; 1498 } else { 1499 eui[3] = 0xFF; 1500 eui[4] = 0xFE; 1501 eui[0] ^= 2; 1502 } 1503 return 0; 1504 } 1505 1506 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1507 { 1508 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1509 if (dev->addr_len != ARCNET_ALEN) 1510 return -1; 1511 memset(eui, 0, 7); 1512 eui[7] = *(u8*)dev->dev_addr; 1513 return 0; 1514 } 1515 1516 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1517 { 1518 if (dev->addr_len != INFINIBAND_ALEN) 1519 return -1; 1520 memcpy(eui, dev->dev_addr + 12, 8); 1521 eui[0] |= 2; 1522 return 0; 1523 } 1524 1525 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1526 { 1527 if (addr == 0) 1528 return -1; 1529 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1530 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1531 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1532 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1533 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1534 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1535 eui[1] = 0; 1536 eui[2] = 0x5E; 1537 eui[3] = 0xFE; 1538 memcpy(eui + 4, &addr, 4); 1539 return 0; 1540 } 1541 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1542 1543 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1544 { 1545 if (dev->priv_flags & IFF_ISATAP) 1546 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1547 return -1; 1548 } 1549 1550 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1551 { 1552 switch (dev->type) { 1553 case ARPHRD_ETHER: 1554 case ARPHRD_FDDI: 1555 case ARPHRD_IEEE802_TR: 1556 return addrconf_ifid_eui48(eui, dev); 1557 case ARPHRD_ARCNET: 1558 return addrconf_ifid_arcnet(eui, dev); 1559 case ARPHRD_INFINIBAND: 1560 return addrconf_ifid_infiniband(eui, dev); 1561 case ARPHRD_SIT: 1562 return addrconf_ifid_sit(eui, dev); 1563 } 1564 return -1; 1565 } 1566 1567 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1568 { 1569 int err = -1; 1570 struct inet6_ifaddr *ifp; 1571 1572 read_lock_bh(&idev->lock); 1573 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1574 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1575 memcpy(eui, ifp->addr.s6_addr+8, 8); 1576 err = 0; 1577 break; 1578 } 1579 } 1580 read_unlock_bh(&idev->lock); 1581 return err; 1582 } 1583 1584 #ifdef CONFIG_IPV6_PRIVACY 1585 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1586 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1587 { 1588 regen: 1589 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1590 idev->rndid[0] &= ~0x02; 1591 1592 /* 1593 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1594 * check if generated address is not inappropriate 1595 * 1596 * - Reserved subnet anycast (RFC 2526) 1597 * 11111101 11....11 1xxxxxxx 1598 * - ISATAP (RFC4214) 6.1 1599 * 00-00-5E-FE-xx-xx-xx-xx 1600 * - value 0 1601 * - XXX: already assigned to an address on the device 1602 */ 1603 if (idev->rndid[0] == 0xfd && 1604 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1605 (idev->rndid[7]&0x80)) 1606 goto regen; 1607 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1608 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1609 goto regen; 1610 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1611 goto regen; 1612 } 1613 1614 return 0; 1615 } 1616 1617 static void ipv6_regen_rndid(unsigned long data) 1618 { 1619 struct inet6_dev *idev = (struct inet6_dev *) data; 1620 unsigned long expires; 1621 1622 rcu_read_lock_bh(); 1623 write_lock_bh(&idev->lock); 1624 1625 if (idev->dead) 1626 goto out; 1627 1628 if (__ipv6_regen_rndid(idev) < 0) 1629 goto out; 1630 1631 expires = jiffies + 1632 idev->cnf.temp_prefered_lft * HZ - 1633 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1634 if (time_before(expires, jiffies)) { 1635 printk(KERN_WARNING 1636 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1637 idev->dev->name); 1638 goto out; 1639 } 1640 1641 if (!mod_timer(&idev->regen_timer, expires)) 1642 in6_dev_hold(idev); 1643 1644 out: 1645 write_unlock_bh(&idev->lock); 1646 rcu_read_unlock_bh(); 1647 in6_dev_put(idev); 1648 } 1649 1650 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1651 int ret = 0; 1652 1653 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1654 ret = __ipv6_regen_rndid(idev); 1655 return ret; 1656 } 1657 #endif 1658 1659 /* 1660 * Add prefix route. 1661 */ 1662 1663 static void 1664 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1665 unsigned long expires, u32 flags) 1666 { 1667 struct fib6_config cfg = { 1668 .fc_table = RT6_TABLE_PREFIX, 1669 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1670 .fc_ifindex = dev->ifindex, 1671 .fc_expires = expires, 1672 .fc_dst_len = plen, 1673 .fc_flags = RTF_UP | flags, 1674 .fc_nlinfo.nl_net = dev_net(dev), 1675 .fc_protocol = RTPROT_KERNEL, 1676 }; 1677 1678 ipv6_addr_copy(&cfg.fc_dst, pfx); 1679 1680 /* Prevent useless cloning on PtP SIT. 1681 This thing is done here expecting that the whole 1682 class of non-broadcast devices need not cloning. 1683 */ 1684 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1685 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1686 cfg.fc_flags |= RTF_NONEXTHOP; 1687 #endif 1688 1689 ip6_route_add(&cfg); 1690 } 1691 1692 /* Create "default" multicast route to the interface */ 1693 1694 static void addrconf_add_mroute(struct net_device *dev) 1695 { 1696 struct fib6_config cfg = { 1697 .fc_table = RT6_TABLE_LOCAL, 1698 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1699 .fc_ifindex = dev->ifindex, 1700 .fc_dst_len = 8, 1701 .fc_flags = RTF_UP, 1702 .fc_nlinfo.nl_net = dev_net(dev), 1703 }; 1704 1705 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1706 1707 ip6_route_add(&cfg); 1708 } 1709 1710 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1711 static void sit_route_add(struct net_device *dev) 1712 { 1713 struct fib6_config cfg = { 1714 .fc_table = RT6_TABLE_MAIN, 1715 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1716 .fc_ifindex = dev->ifindex, 1717 .fc_dst_len = 96, 1718 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1719 .fc_nlinfo.nl_net = dev_net(dev), 1720 }; 1721 1722 /* prefix length - 96 bits "::d.d.d.d" */ 1723 ip6_route_add(&cfg); 1724 } 1725 #endif 1726 1727 static void addrconf_add_lroute(struct net_device *dev) 1728 { 1729 struct in6_addr addr; 1730 1731 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1732 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1733 } 1734 1735 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1736 { 1737 struct inet6_dev *idev; 1738 1739 ASSERT_RTNL(); 1740 1741 if ((idev = ipv6_find_idev(dev)) == NULL) 1742 return NULL; 1743 1744 /* Add default multicast route */ 1745 addrconf_add_mroute(dev); 1746 1747 /* Add link local route */ 1748 addrconf_add_lroute(dev); 1749 return idev; 1750 } 1751 1752 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1753 { 1754 struct prefix_info *pinfo; 1755 __u32 valid_lft; 1756 __u32 prefered_lft; 1757 int addr_type; 1758 struct inet6_dev *in6_dev; 1759 struct net *net = dev_net(dev); 1760 1761 pinfo = (struct prefix_info *) opt; 1762 1763 if (len < sizeof(struct prefix_info)) { 1764 ADBG(("addrconf: prefix option too short\n")); 1765 return; 1766 } 1767 1768 /* 1769 * Validation checks ([ADDRCONF], page 19) 1770 */ 1771 1772 addr_type = ipv6_addr_type(&pinfo->prefix); 1773 1774 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1775 return; 1776 1777 valid_lft = ntohl(pinfo->valid); 1778 prefered_lft = ntohl(pinfo->prefered); 1779 1780 if (prefered_lft > valid_lft) { 1781 if (net_ratelimit()) 1782 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1783 return; 1784 } 1785 1786 in6_dev = in6_dev_get(dev); 1787 1788 if (in6_dev == NULL) { 1789 if (net_ratelimit()) 1790 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1791 return; 1792 } 1793 1794 /* 1795 * Two things going on here: 1796 * 1) Add routes for on-link prefixes 1797 * 2) Configure prefixes with the auto flag set 1798 */ 1799 1800 if (pinfo->onlink) { 1801 struct rt6_info *rt; 1802 unsigned long rt_expires; 1803 1804 /* Avoid arithmetic overflow. Really, we could 1805 * save rt_expires in seconds, likely valid_lft, 1806 * but it would require division in fib gc, that it 1807 * not good. 1808 */ 1809 if (HZ > USER_HZ) 1810 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1811 else 1812 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1813 1814 if (addrconf_finite_timeout(rt_expires)) 1815 rt_expires *= HZ; 1816 1817 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1818 dev->ifindex, 1); 1819 1820 if (rt && addrconf_is_prefix_route(rt)) { 1821 /* Autoconf prefix route */ 1822 if (valid_lft == 0) { 1823 ip6_del_rt(rt); 1824 rt = NULL; 1825 } else if (addrconf_finite_timeout(rt_expires)) { 1826 /* not infinity */ 1827 rt->rt6i_expires = jiffies + rt_expires; 1828 rt->rt6i_flags |= RTF_EXPIRES; 1829 } else { 1830 rt->rt6i_flags &= ~RTF_EXPIRES; 1831 rt->rt6i_expires = 0; 1832 } 1833 } else if (valid_lft) { 1834 clock_t expires = 0; 1835 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1836 if (addrconf_finite_timeout(rt_expires)) { 1837 /* not infinity */ 1838 flags |= RTF_EXPIRES; 1839 expires = jiffies_to_clock_t(rt_expires); 1840 } 1841 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1842 dev, expires, flags); 1843 } 1844 if (rt) 1845 dst_release(&rt->u.dst); 1846 } 1847 1848 /* Try to figure out our local address for this prefix */ 1849 1850 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1851 struct inet6_ifaddr * ifp; 1852 struct in6_addr addr; 1853 int create = 0, update_lft = 0; 1854 1855 if (pinfo->prefix_len == 64) { 1856 memcpy(&addr, &pinfo->prefix, 8); 1857 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1858 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1859 in6_dev_put(in6_dev); 1860 return; 1861 } 1862 goto ok; 1863 } 1864 if (net_ratelimit()) 1865 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1866 pinfo->prefix_len); 1867 in6_dev_put(in6_dev); 1868 return; 1869 1870 ok: 1871 1872 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1873 1874 if (ifp == NULL && valid_lft) { 1875 int max_addresses = in6_dev->cnf.max_addresses; 1876 u32 addr_flags = 0; 1877 1878 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1879 if (in6_dev->cnf.optimistic_dad && 1880 !net->ipv6.devconf_all->forwarding) 1881 addr_flags = IFA_F_OPTIMISTIC; 1882 #endif 1883 1884 /* Do not allow to create too much of autoconfigured 1885 * addresses; this would be too easy way to crash kernel. 1886 */ 1887 if (!max_addresses || 1888 ipv6_count_addresses(in6_dev) < max_addresses) 1889 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1890 addr_type&IPV6_ADDR_SCOPE_MASK, 1891 addr_flags); 1892 1893 if (!ifp || IS_ERR(ifp)) { 1894 in6_dev_put(in6_dev); 1895 return; 1896 } 1897 1898 update_lft = create = 1; 1899 ifp->cstamp = jiffies; 1900 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1901 } 1902 1903 if (ifp) { 1904 int flags; 1905 unsigned long now; 1906 #ifdef CONFIG_IPV6_PRIVACY 1907 struct inet6_ifaddr *ift; 1908 #endif 1909 u32 stored_lft; 1910 1911 /* update lifetime (RFC2462 5.5.3 e) */ 1912 spin_lock(&ifp->lock); 1913 now = jiffies; 1914 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1915 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1916 else 1917 stored_lft = 0; 1918 if (!update_lft && stored_lft) { 1919 if (valid_lft > MIN_VALID_LIFETIME || 1920 valid_lft > stored_lft) 1921 update_lft = 1; 1922 else if (stored_lft <= MIN_VALID_LIFETIME) { 1923 /* valid_lft <= stored_lft is always true */ 1924 /* 1925 * RFC 4862 Section 5.5.3e: 1926 * "Note that the preferred lifetime of 1927 * the corresponding address is always 1928 * reset to the Preferred Lifetime in 1929 * the received Prefix Information 1930 * option, regardless of whether the 1931 * valid lifetime is also reset or 1932 * ignored." 1933 * 1934 * So if the preferred lifetime in 1935 * this advertisement is different 1936 * than what we have stored, but the 1937 * valid lifetime is invalid, just 1938 * reset prefered_lft. 1939 * 1940 * We must set the valid lifetime 1941 * to the stored lifetime since we'll 1942 * be updating the timestamp below, 1943 * else we'll set it back to the 1944 * minumum. 1945 */ 1946 if (prefered_lft != ifp->prefered_lft) { 1947 valid_lft = stored_lft; 1948 update_lft = 1; 1949 } 1950 } else { 1951 valid_lft = MIN_VALID_LIFETIME; 1952 if (valid_lft < prefered_lft) 1953 prefered_lft = valid_lft; 1954 update_lft = 1; 1955 } 1956 } 1957 1958 if (update_lft) { 1959 ifp->valid_lft = valid_lft; 1960 ifp->prefered_lft = prefered_lft; 1961 ifp->tstamp = now; 1962 flags = ifp->flags; 1963 ifp->flags &= ~IFA_F_DEPRECATED; 1964 spin_unlock(&ifp->lock); 1965 1966 if (!(flags&IFA_F_TENTATIVE)) 1967 ipv6_ifa_notify(0, ifp); 1968 } else 1969 spin_unlock(&ifp->lock); 1970 1971 #ifdef CONFIG_IPV6_PRIVACY 1972 read_lock_bh(&in6_dev->lock); 1973 /* update all temporary addresses in the list */ 1974 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1975 /* 1976 * When adjusting the lifetimes of an existing 1977 * temporary address, only lower the lifetimes. 1978 * Implementations must not increase the 1979 * lifetimes of an existing temporary address 1980 * when processing a Prefix Information Option. 1981 */ 1982 if (ifp != ift->ifpub) 1983 continue; 1984 1985 spin_lock(&ift->lock); 1986 flags = ift->flags; 1987 if (ift->valid_lft > valid_lft && 1988 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1989 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1990 if (ift->prefered_lft > prefered_lft && 1991 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1992 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1993 spin_unlock(&ift->lock); 1994 if (!(flags&IFA_F_TENTATIVE)) 1995 ipv6_ifa_notify(0, ift); 1996 } 1997 1998 if (create && in6_dev->cnf.use_tempaddr > 0) { 1999 /* 2000 * When a new public address is created as described in [ADDRCONF], 2001 * also create a new temporary address. 2002 */ 2003 read_unlock_bh(&in6_dev->lock); 2004 ipv6_create_tempaddr(ifp, NULL); 2005 } else { 2006 read_unlock_bh(&in6_dev->lock); 2007 } 2008 #endif 2009 in6_ifa_put(ifp); 2010 addrconf_verify(0); 2011 } 2012 } 2013 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2014 in6_dev_put(in6_dev); 2015 } 2016 2017 /* 2018 * Set destination address. 2019 * Special case for SIT interfaces where we create a new "virtual" 2020 * device. 2021 */ 2022 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2023 { 2024 struct in6_ifreq ireq; 2025 struct net_device *dev; 2026 int err = -EINVAL; 2027 2028 rtnl_lock(); 2029 2030 err = -EFAULT; 2031 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2032 goto err_exit; 2033 2034 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2035 2036 err = -ENODEV; 2037 if (dev == NULL) 2038 goto err_exit; 2039 2040 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2041 if (dev->type == ARPHRD_SIT) { 2042 const struct net_device_ops *ops = dev->netdev_ops; 2043 struct ifreq ifr; 2044 struct ip_tunnel_parm p; 2045 2046 err = -EADDRNOTAVAIL; 2047 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2048 goto err_exit; 2049 2050 memset(&p, 0, sizeof(p)); 2051 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2052 p.iph.saddr = 0; 2053 p.iph.version = 4; 2054 p.iph.ihl = 5; 2055 p.iph.protocol = IPPROTO_IPV6; 2056 p.iph.ttl = 64; 2057 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2058 2059 if (ops->ndo_do_ioctl) { 2060 mm_segment_t oldfs = get_fs(); 2061 2062 set_fs(KERNEL_DS); 2063 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2064 set_fs(oldfs); 2065 } else 2066 err = -EOPNOTSUPP; 2067 2068 if (err == 0) { 2069 err = -ENOBUFS; 2070 dev = __dev_get_by_name(net, p.name); 2071 if (!dev) 2072 goto err_exit; 2073 err = dev_open(dev); 2074 } 2075 } 2076 #endif 2077 2078 err_exit: 2079 rtnl_unlock(); 2080 return err; 2081 } 2082 2083 /* 2084 * Manual configuration of address on an interface 2085 */ 2086 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2087 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2088 __u32 valid_lft) 2089 { 2090 struct inet6_ifaddr *ifp; 2091 struct inet6_dev *idev; 2092 struct net_device *dev; 2093 int scope; 2094 u32 flags; 2095 clock_t expires; 2096 unsigned long timeout; 2097 2098 ASSERT_RTNL(); 2099 2100 if (plen > 128) 2101 return -EINVAL; 2102 2103 /* check the lifetime */ 2104 if (!valid_lft || prefered_lft > valid_lft) 2105 return -EINVAL; 2106 2107 dev = __dev_get_by_index(net, ifindex); 2108 if (!dev) 2109 return -ENODEV; 2110 2111 if ((idev = addrconf_add_dev(dev)) == NULL) 2112 return -ENOBUFS; 2113 2114 scope = ipv6_addr_scope(pfx); 2115 2116 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2117 if (addrconf_finite_timeout(timeout)) { 2118 expires = jiffies_to_clock_t(timeout * HZ); 2119 valid_lft = timeout; 2120 flags = RTF_EXPIRES; 2121 } else { 2122 expires = 0; 2123 flags = 0; 2124 ifa_flags |= IFA_F_PERMANENT; 2125 } 2126 2127 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2128 if (addrconf_finite_timeout(timeout)) { 2129 if (timeout == 0) 2130 ifa_flags |= IFA_F_DEPRECATED; 2131 prefered_lft = timeout; 2132 } 2133 2134 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2135 2136 if (!IS_ERR(ifp)) { 2137 spin_lock_bh(&ifp->lock); 2138 ifp->valid_lft = valid_lft; 2139 ifp->prefered_lft = prefered_lft; 2140 ifp->tstamp = jiffies; 2141 spin_unlock_bh(&ifp->lock); 2142 2143 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2144 expires, flags); 2145 /* 2146 * Note that section 3.1 of RFC 4429 indicates 2147 * that the Optimistic flag should not be set for 2148 * manually configured addresses 2149 */ 2150 addrconf_dad_start(ifp, 0); 2151 in6_ifa_put(ifp); 2152 addrconf_verify(0); 2153 return 0; 2154 } 2155 2156 return PTR_ERR(ifp); 2157 } 2158 2159 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2160 unsigned int plen) 2161 { 2162 struct inet6_ifaddr *ifp; 2163 struct inet6_dev *idev; 2164 struct net_device *dev; 2165 2166 if (plen > 128) 2167 return -EINVAL; 2168 2169 dev = __dev_get_by_index(net, ifindex); 2170 if (!dev) 2171 return -ENODEV; 2172 2173 if ((idev = __in6_dev_get(dev)) == NULL) 2174 return -ENXIO; 2175 2176 read_lock_bh(&idev->lock); 2177 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2178 if (ifp->prefix_len == plen && 2179 ipv6_addr_equal(pfx, &ifp->addr)) { 2180 in6_ifa_hold(ifp); 2181 read_unlock_bh(&idev->lock); 2182 2183 ipv6_del_addr(ifp); 2184 2185 /* If the last address is deleted administratively, 2186 disable IPv6 on this interface. 2187 */ 2188 if (idev->addr_list == NULL) 2189 addrconf_ifdown(idev->dev, 1); 2190 return 0; 2191 } 2192 } 2193 read_unlock_bh(&idev->lock); 2194 return -EADDRNOTAVAIL; 2195 } 2196 2197 2198 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2199 { 2200 struct in6_ifreq ireq; 2201 int err; 2202 2203 if (!capable(CAP_NET_ADMIN)) 2204 return -EPERM; 2205 2206 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2207 return -EFAULT; 2208 2209 rtnl_lock(); 2210 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2211 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2212 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2213 rtnl_unlock(); 2214 return err; 2215 } 2216 2217 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2218 { 2219 struct in6_ifreq ireq; 2220 int err; 2221 2222 if (!capable(CAP_NET_ADMIN)) 2223 return -EPERM; 2224 2225 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2226 return -EFAULT; 2227 2228 rtnl_lock(); 2229 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2230 ireq.ifr6_prefixlen); 2231 rtnl_unlock(); 2232 return err; 2233 } 2234 2235 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2236 int plen, int scope) 2237 { 2238 struct inet6_ifaddr *ifp; 2239 2240 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2241 if (!IS_ERR(ifp)) { 2242 spin_lock_bh(&ifp->lock); 2243 ifp->flags &= ~IFA_F_TENTATIVE; 2244 spin_unlock_bh(&ifp->lock); 2245 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2246 in6_ifa_put(ifp); 2247 } 2248 } 2249 2250 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2251 static void sit_add_v4_addrs(struct inet6_dev *idev) 2252 { 2253 struct in6_addr addr; 2254 struct net_device *dev; 2255 struct net *net = dev_net(idev->dev); 2256 int scope; 2257 2258 ASSERT_RTNL(); 2259 2260 memset(&addr, 0, sizeof(struct in6_addr)); 2261 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2262 2263 if (idev->dev->flags&IFF_POINTOPOINT) { 2264 addr.s6_addr32[0] = htonl(0xfe800000); 2265 scope = IFA_LINK; 2266 } else { 2267 scope = IPV6_ADDR_COMPATv4; 2268 } 2269 2270 if (addr.s6_addr32[3]) { 2271 add_addr(idev, &addr, 128, scope); 2272 return; 2273 } 2274 2275 for_each_netdev(net, dev) { 2276 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2277 if (in_dev && (dev->flags & IFF_UP)) { 2278 struct in_ifaddr * ifa; 2279 2280 int flag = scope; 2281 2282 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2283 int plen; 2284 2285 addr.s6_addr32[3] = ifa->ifa_local; 2286 2287 if (ifa->ifa_scope == RT_SCOPE_LINK) 2288 continue; 2289 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2290 if (idev->dev->flags&IFF_POINTOPOINT) 2291 continue; 2292 flag |= IFA_HOST; 2293 } 2294 if (idev->dev->flags&IFF_POINTOPOINT) 2295 plen = 64; 2296 else 2297 plen = 96; 2298 2299 add_addr(idev, &addr, plen, flag); 2300 } 2301 } 2302 } 2303 } 2304 #endif 2305 2306 static void init_loopback(struct net_device *dev) 2307 { 2308 struct inet6_dev *idev; 2309 2310 /* ::1 */ 2311 2312 ASSERT_RTNL(); 2313 2314 if ((idev = ipv6_find_idev(dev)) == NULL) { 2315 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2316 return; 2317 } 2318 2319 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2320 } 2321 2322 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2323 { 2324 struct inet6_ifaddr * ifp; 2325 u32 addr_flags = IFA_F_PERMANENT; 2326 2327 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2328 if (idev->cnf.optimistic_dad && 2329 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2330 addr_flags |= IFA_F_OPTIMISTIC; 2331 #endif 2332 2333 2334 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2335 if (!IS_ERR(ifp)) { 2336 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2337 addrconf_dad_start(ifp, 0); 2338 in6_ifa_put(ifp); 2339 } 2340 } 2341 2342 static void addrconf_dev_config(struct net_device *dev) 2343 { 2344 struct in6_addr addr; 2345 struct inet6_dev * idev; 2346 2347 ASSERT_RTNL(); 2348 2349 if ((dev->type != ARPHRD_ETHER) && 2350 (dev->type != ARPHRD_FDDI) && 2351 (dev->type != ARPHRD_IEEE802_TR) && 2352 (dev->type != ARPHRD_ARCNET) && 2353 (dev->type != ARPHRD_INFINIBAND)) { 2354 /* Alas, we support only Ethernet autoconfiguration. */ 2355 return; 2356 } 2357 2358 idev = addrconf_add_dev(dev); 2359 if (idev == NULL) 2360 return; 2361 2362 memset(&addr, 0, sizeof(struct in6_addr)); 2363 addr.s6_addr32[0] = htonl(0xFE800000); 2364 2365 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2366 addrconf_add_linklocal(idev, &addr); 2367 } 2368 2369 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2370 static void addrconf_sit_config(struct net_device *dev) 2371 { 2372 struct inet6_dev *idev; 2373 2374 ASSERT_RTNL(); 2375 2376 /* 2377 * Configure the tunnel with one of our IPv4 2378 * addresses... we should configure all of 2379 * our v4 addrs in the tunnel 2380 */ 2381 2382 if ((idev = ipv6_find_idev(dev)) == NULL) { 2383 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2384 return; 2385 } 2386 2387 if (dev->priv_flags & IFF_ISATAP) { 2388 struct in6_addr addr; 2389 2390 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2391 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2392 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2393 addrconf_add_linklocal(idev, &addr); 2394 return; 2395 } 2396 2397 sit_add_v4_addrs(idev); 2398 2399 if (dev->flags&IFF_POINTOPOINT) { 2400 addrconf_add_mroute(dev); 2401 addrconf_add_lroute(dev); 2402 } else 2403 sit_route_add(dev); 2404 } 2405 #endif 2406 2407 static inline int 2408 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2409 { 2410 struct in6_addr lladdr; 2411 2412 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2413 addrconf_add_linklocal(idev, &lladdr); 2414 return 0; 2415 } 2416 return -1; 2417 } 2418 2419 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2420 { 2421 struct net_device *link_dev; 2422 struct net *net = dev_net(idev->dev); 2423 2424 /* first try to inherit the link-local address from the link device */ 2425 if (idev->dev->iflink && 2426 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2427 if (!ipv6_inherit_linklocal(idev, link_dev)) 2428 return; 2429 } 2430 /* then try to inherit it from any device */ 2431 for_each_netdev(net, link_dev) { 2432 if (!ipv6_inherit_linklocal(idev, link_dev)) 2433 return; 2434 } 2435 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2436 } 2437 2438 /* 2439 * Autoconfigure tunnel with a link-local address so routing protocols, 2440 * DHCPv6, MLD etc. can be run over the virtual link 2441 */ 2442 2443 static void addrconf_ip6_tnl_config(struct net_device *dev) 2444 { 2445 struct inet6_dev *idev; 2446 2447 ASSERT_RTNL(); 2448 2449 if ((idev = addrconf_add_dev(dev)) == NULL) { 2450 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2451 return; 2452 } 2453 ip6_tnl_add_linklocal(idev); 2454 } 2455 2456 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2457 void * data) 2458 { 2459 struct net_device *dev = (struct net_device *) data; 2460 struct inet6_dev *idev = __in6_dev_get(dev); 2461 int run_pending = 0; 2462 int err; 2463 2464 switch(event) { 2465 case NETDEV_REGISTER: 2466 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2467 idev = ipv6_add_dev(dev); 2468 if (!idev) 2469 return notifier_from_errno(-ENOMEM); 2470 } 2471 break; 2472 case NETDEV_UP: 2473 case NETDEV_CHANGE: 2474 if (dev->flags & IFF_SLAVE) 2475 break; 2476 2477 if (event == NETDEV_UP) { 2478 if (!addrconf_qdisc_ok(dev)) { 2479 /* device is not ready yet. */ 2480 printk(KERN_INFO 2481 "ADDRCONF(NETDEV_UP): %s: " 2482 "link is not ready\n", 2483 dev->name); 2484 break; 2485 } 2486 2487 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2488 idev = ipv6_add_dev(dev); 2489 2490 if (idev) { 2491 idev->if_flags |= IF_READY; 2492 run_pending = 1; 2493 } 2494 } else { 2495 if (!addrconf_qdisc_ok(dev)) { 2496 /* device is still not ready. */ 2497 break; 2498 } 2499 2500 if (idev) { 2501 if (idev->if_flags & IF_READY) { 2502 /* device is already configured. */ 2503 break; 2504 } 2505 idev->if_flags |= IF_READY; 2506 } 2507 2508 printk(KERN_INFO 2509 "ADDRCONF(NETDEV_CHANGE): %s: " 2510 "link becomes ready\n", 2511 dev->name); 2512 2513 run_pending = 1; 2514 } 2515 2516 switch(dev->type) { 2517 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2518 case ARPHRD_SIT: 2519 addrconf_sit_config(dev); 2520 break; 2521 #endif 2522 case ARPHRD_TUNNEL6: 2523 addrconf_ip6_tnl_config(dev); 2524 break; 2525 case ARPHRD_LOOPBACK: 2526 init_loopback(dev); 2527 break; 2528 2529 default: 2530 addrconf_dev_config(dev); 2531 break; 2532 } 2533 if (idev) { 2534 if (run_pending) 2535 addrconf_dad_run(idev); 2536 2537 /* If the MTU changed during the interface down, when the 2538 interface up, the changed MTU must be reflected in the 2539 idev as well as routers. 2540 */ 2541 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2542 rt6_mtu_change(dev, dev->mtu); 2543 idev->cnf.mtu6 = dev->mtu; 2544 } 2545 idev->tstamp = jiffies; 2546 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2547 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2548 stop IPv6 on this interface. 2549 */ 2550 if (dev->mtu < IPV6_MIN_MTU) 2551 addrconf_ifdown(dev, event != NETDEV_DOWN); 2552 } 2553 break; 2554 2555 case NETDEV_CHANGEMTU: 2556 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2557 rt6_mtu_change(dev, dev->mtu); 2558 idev->cnf.mtu6 = dev->mtu; 2559 break; 2560 } 2561 2562 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2563 idev = ipv6_add_dev(dev); 2564 if (idev) 2565 break; 2566 } 2567 2568 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2569 2570 case NETDEV_DOWN: 2571 case NETDEV_UNREGISTER: 2572 /* 2573 * Remove all addresses from this interface. 2574 */ 2575 addrconf_ifdown(dev, event != NETDEV_DOWN); 2576 break; 2577 2578 case NETDEV_CHANGENAME: 2579 if (idev) { 2580 snmp6_unregister_dev(idev); 2581 addrconf_sysctl_unregister(idev); 2582 addrconf_sysctl_register(idev); 2583 err = snmp6_register_dev(idev); 2584 if (err) 2585 return notifier_from_errno(err); 2586 } 2587 break; 2588 case NETDEV_BONDING_OLDTYPE: 2589 case NETDEV_BONDING_NEWTYPE: 2590 addrconf_bonding_change(dev, event); 2591 break; 2592 } 2593 2594 return NOTIFY_OK; 2595 } 2596 2597 /* 2598 * addrconf module should be notified of a device going up 2599 */ 2600 static struct notifier_block ipv6_dev_notf = { 2601 .notifier_call = addrconf_notify, 2602 .priority = 0 2603 }; 2604 2605 static void addrconf_bonding_change(struct net_device *dev, unsigned long event) 2606 { 2607 struct inet6_dev *idev; 2608 ASSERT_RTNL(); 2609 2610 idev = __in6_dev_get(dev); 2611 2612 if (event == NETDEV_BONDING_NEWTYPE) 2613 ipv6_mc_remap(idev); 2614 else if (event == NETDEV_BONDING_OLDTYPE) 2615 ipv6_mc_unmap(idev); 2616 } 2617 2618 static int addrconf_ifdown(struct net_device *dev, int how) 2619 { 2620 struct inet6_dev *idev; 2621 struct inet6_ifaddr *ifa, *keep_list, **bifa; 2622 struct net *net = dev_net(dev); 2623 int i; 2624 2625 ASSERT_RTNL(); 2626 2627 rt6_ifdown(net, dev); 2628 neigh_ifdown(&nd_tbl, dev); 2629 2630 idev = __in6_dev_get(dev); 2631 if (idev == NULL) 2632 return -ENODEV; 2633 2634 /* Step 1: remove reference to ipv6 device from parent device. 2635 Do not dev_put! 2636 */ 2637 if (how) { 2638 idev->dead = 1; 2639 2640 /* protected by rtnl_lock */ 2641 rcu_assign_pointer(dev->ip6_ptr, NULL); 2642 2643 /* Step 1.5: remove snmp6 entry */ 2644 snmp6_unregister_dev(idev); 2645 2646 } 2647 2648 /* Step 2: clear hash table */ 2649 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2650 bifa = &inet6_addr_lst[i]; 2651 2652 write_lock_bh(&addrconf_hash_lock); 2653 while ((ifa = *bifa) != NULL) { 2654 if (ifa->idev == idev && 2655 (how || !(ifa->flags&IFA_F_PERMANENT) || 2656 ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) { 2657 *bifa = ifa->lst_next; 2658 ifa->lst_next = NULL; 2659 __in6_ifa_put(ifa); 2660 continue; 2661 } 2662 bifa = &ifa->lst_next; 2663 } 2664 write_unlock_bh(&addrconf_hash_lock); 2665 } 2666 2667 write_lock_bh(&idev->lock); 2668 2669 /* Step 3: clear flags for stateless addrconf */ 2670 if (!how) 2671 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2672 2673 /* Step 4: clear address list */ 2674 #ifdef CONFIG_IPV6_PRIVACY 2675 if (how && del_timer(&idev->regen_timer)) 2676 in6_dev_put(idev); 2677 2678 /* clear tempaddr list */ 2679 while ((ifa = idev->tempaddr_list) != NULL) { 2680 idev->tempaddr_list = ifa->tmp_next; 2681 ifa->tmp_next = NULL; 2682 ifa->dead = 1; 2683 write_unlock_bh(&idev->lock); 2684 spin_lock_bh(&ifa->lock); 2685 2686 if (ifa->ifpub) { 2687 in6_ifa_put(ifa->ifpub); 2688 ifa->ifpub = NULL; 2689 } 2690 spin_unlock_bh(&ifa->lock); 2691 in6_ifa_put(ifa); 2692 write_lock_bh(&idev->lock); 2693 } 2694 #endif 2695 keep_list = NULL; 2696 bifa = &keep_list; 2697 while ((ifa = idev->addr_list) != NULL) { 2698 idev->addr_list = ifa->if_next; 2699 ifa->if_next = NULL; 2700 2701 addrconf_del_timer(ifa); 2702 2703 /* If just doing link down, and address is permanent 2704 and not link-local, then retain it. */ 2705 if (how == 0 && 2706 (ifa->flags&IFA_F_PERMANENT) && 2707 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) { 2708 2709 /* Move to holding list */ 2710 *bifa = ifa; 2711 bifa = &ifa->if_next; 2712 2713 /* If not doing DAD on this address, just keep it. */ 2714 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) || 2715 idev->cnf.accept_dad <= 0 || 2716 (ifa->flags & IFA_F_NODAD)) 2717 continue; 2718 2719 /* If it was tentative already, no need to notify */ 2720 if (ifa->flags & IFA_F_TENTATIVE) 2721 continue; 2722 2723 /* Flag it for later restoration when link comes up */ 2724 ifa->flags |= IFA_F_TENTATIVE; 2725 in6_ifa_hold(ifa); 2726 } else { 2727 ifa->dead = 1; 2728 } 2729 write_unlock_bh(&idev->lock); 2730 2731 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2733 in6_ifa_put(ifa); 2734 2735 write_lock_bh(&idev->lock); 2736 } 2737 2738 idev->addr_list = keep_list; 2739 2740 write_unlock_bh(&idev->lock); 2741 2742 /* Step 5: Discard multicast list */ 2743 2744 if (how) 2745 ipv6_mc_destroy_dev(idev); 2746 else 2747 ipv6_mc_down(idev); 2748 2749 idev->tstamp = jiffies; 2750 2751 /* Shot the device (if unregistered) */ 2752 2753 if (how) { 2754 addrconf_sysctl_unregister(idev); 2755 neigh_parms_release(&nd_tbl, idev->nd_parms); 2756 neigh_ifdown(&nd_tbl, dev); 2757 in6_dev_put(idev); 2758 } 2759 return 0; 2760 } 2761 2762 static void addrconf_rs_timer(unsigned long data) 2763 { 2764 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2765 struct inet6_dev *idev = ifp->idev; 2766 2767 read_lock(&idev->lock); 2768 if (idev->dead || !(idev->if_flags & IF_READY)) 2769 goto out; 2770 2771 if (idev->cnf.forwarding) 2772 goto out; 2773 2774 /* Announcement received after solicitation was sent */ 2775 if (idev->if_flags & IF_RA_RCVD) 2776 goto out; 2777 2778 spin_lock(&ifp->lock); 2779 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2780 /* The wait after the last probe can be shorter */ 2781 addrconf_mod_timer(ifp, AC_RS, 2782 (ifp->probes == idev->cnf.rtr_solicits) ? 2783 idev->cnf.rtr_solicit_delay : 2784 idev->cnf.rtr_solicit_interval); 2785 spin_unlock(&ifp->lock); 2786 2787 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2788 } else { 2789 spin_unlock(&ifp->lock); 2790 /* 2791 * Note: we do not support deprecated "all on-link" 2792 * assumption any longer. 2793 */ 2794 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2795 idev->dev->name); 2796 } 2797 2798 out: 2799 read_unlock(&idev->lock); 2800 in6_ifa_put(ifp); 2801 } 2802 2803 /* 2804 * Duplicate Address Detection 2805 */ 2806 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2807 { 2808 unsigned long rand_num; 2809 struct inet6_dev *idev = ifp->idev; 2810 2811 if (ifp->flags & IFA_F_OPTIMISTIC) 2812 rand_num = 0; 2813 else 2814 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2815 2816 ifp->probes = idev->cnf.dad_transmits; 2817 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2818 } 2819 2820 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2821 { 2822 struct inet6_dev *idev = ifp->idev; 2823 struct net_device *dev = idev->dev; 2824 2825 addrconf_join_solict(dev, &ifp->addr); 2826 2827 net_srandom(ifp->addr.s6_addr32[3]); 2828 2829 read_lock_bh(&idev->lock); 2830 if (ifp->dead) 2831 goto out; 2832 2833 spin_lock(&ifp->lock); 2834 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2835 idev->cnf.accept_dad < 1 || 2836 !(ifp->flags&IFA_F_TENTATIVE) || 2837 ifp->flags & IFA_F_NODAD) { 2838 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2839 spin_unlock(&ifp->lock); 2840 read_unlock_bh(&idev->lock); 2841 2842 addrconf_dad_completed(ifp); 2843 return; 2844 } 2845 2846 if (!(idev->if_flags & IF_READY)) { 2847 spin_unlock(&ifp->lock); 2848 read_unlock_bh(&idev->lock); 2849 /* 2850 * If the device is not ready: 2851 * - keep it tentative if it is a permanent address. 2852 * - otherwise, kill it. 2853 */ 2854 in6_ifa_hold(ifp); 2855 addrconf_dad_stop(ifp, 0); 2856 return; 2857 } 2858 2859 /* 2860 * Optimistic nodes can start receiving 2861 * Frames right away 2862 */ 2863 if(ifp->flags & IFA_F_OPTIMISTIC) 2864 ip6_ins_rt(ifp->rt); 2865 2866 addrconf_dad_kick(ifp); 2867 spin_unlock(&ifp->lock); 2868 out: 2869 read_unlock_bh(&idev->lock); 2870 } 2871 2872 static void addrconf_dad_timer(unsigned long data) 2873 { 2874 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2875 struct inet6_dev *idev = ifp->idev; 2876 struct in6_addr mcaddr; 2877 2878 read_lock(&idev->lock); 2879 if (idev->dead || !(idev->if_flags & IF_READY)) { 2880 read_unlock(&idev->lock); 2881 goto out; 2882 } 2883 2884 spin_lock(&ifp->lock); 2885 if (ifp->probes == 0) { 2886 /* 2887 * DAD was successful 2888 */ 2889 2890 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2891 spin_unlock(&ifp->lock); 2892 read_unlock(&idev->lock); 2893 2894 addrconf_dad_completed(ifp); 2895 2896 goto out; 2897 } 2898 2899 ifp->probes--; 2900 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2901 spin_unlock(&ifp->lock); 2902 read_unlock(&idev->lock); 2903 2904 /* send a neighbour solicitation for our addr */ 2905 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2906 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2907 out: 2908 in6_ifa_put(ifp); 2909 } 2910 2911 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2912 { 2913 struct net_device * dev = ifp->idev->dev; 2914 2915 /* 2916 * Configure the address for reception. Now it is valid. 2917 */ 2918 2919 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2920 2921 /* If added prefix is link local and forwarding is off, 2922 start sending router solicitations. 2923 */ 2924 2925 if (ifp->idev->cnf.forwarding == 0 && 2926 ifp->idev->cnf.rtr_solicits > 0 && 2927 (dev->flags&IFF_LOOPBACK) == 0 && 2928 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2929 /* 2930 * If a host as already performed a random delay 2931 * [...] as part of DAD [...] there is no need 2932 * to delay again before sending the first RS 2933 */ 2934 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2935 2936 spin_lock_bh(&ifp->lock); 2937 ifp->probes = 1; 2938 ifp->idev->if_flags |= IF_RS_SENT; 2939 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2940 spin_unlock_bh(&ifp->lock); 2941 } 2942 } 2943 2944 static void addrconf_dad_run(struct inet6_dev *idev) { 2945 struct inet6_ifaddr *ifp; 2946 2947 read_lock_bh(&idev->lock); 2948 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2949 spin_lock(&ifp->lock); 2950 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2951 spin_unlock(&ifp->lock); 2952 continue; 2953 } 2954 spin_unlock(&ifp->lock); 2955 addrconf_dad_kick(ifp); 2956 } 2957 read_unlock_bh(&idev->lock); 2958 } 2959 2960 #ifdef CONFIG_PROC_FS 2961 struct if6_iter_state { 2962 struct seq_net_private p; 2963 int bucket; 2964 }; 2965 2966 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2967 { 2968 struct inet6_ifaddr *ifa = NULL; 2969 struct if6_iter_state *state = seq->private; 2970 struct net *net = seq_file_net(seq); 2971 2972 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2973 ifa = inet6_addr_lst[state->bucket]; 2974 2975 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2976 ifa = ifa->lst_next; 2977 if (ifa) 2978 break; 2979 } 2980 return ifa; 2981 } 2982 2983 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2984 { 2985 struct if6_iter_state *state = seq->private; 2986 struct net *net = seq_file_net(seq); 2987 2988 ifa = ifa->lst_next; 2989 try_again: 2990 if (ifa) { 2991 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2992 ifa = ifa->lst_next; 2993 goto try_again; 2994 } 2995 } 2996 2997 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2998 ifa = inet6_addr_lst[state->bucket]; 2999 goto try_again; 3000 } 3001 3002 return ifa; 3003 } 3004 3005 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3006 { 3007 struct inet6_ifaddr *ifa = if6_get_first(seq); 3008 3009 if (ifa) 3010 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3011 --pos; 3012 return pos ? NULL : ifa; 3013 } 3014 3015 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3016 __acquires(addrconf_hash_lock) 3017 { 3018 read_lock_bh(&addrconf_hash_lock); 3019 return if6_get_idx(seq, *pos); 3020 } 3021 3022 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3023 { 3024 struct inet6_ifaddr *ifa; 3025 3026 ifa = if6_get_next(seq, v); 3027 ++*pos; 3028 return ifa; 3029 } 3030 3031 static void if6_seq_stop(struct seq_file *seq, void *v) 3032 __releases(addrconf_hash_lock) 3033 { 3034 read_unlock_bh(&addrconf_hash_lock); 3035 } 3036 3037 static int if6_seq_show(struct seq_file *seq, void *v) 3038 { 3039 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3040 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3041 &ifp->addr, 3042 ifp->idev->dev->ifindex, 3043 ifp->prefix_len, 3044 ifp->scope, 3045 ifp->flags, 3046 ifp->idev->dev->name); 3047 return 0; 3048 } 3049 3050 static const struct seq_operations if6_seq_ops = { 3051 .start = if6_seq_start, 3052 .next = if6_seq_next, 3053 .show = if6_seq_show, 3054 .stop = if6_seq_stop, 3055 }; 3056 3057 static int if6_seq_open(struct inode *inode, struct file *file) 3058 { 3059 return seq_open_net(inode, file, &if6_seq_ops, 3060 sizeof(struct if6_iter_state)); 3061 } 3062 3063 static const struct file_operations if6_fops = { 3064 .owner = THIS_MODULE, 3065 .open = if6_seq_open, 3066 .read = seq_read, 3067 .llseek = seq_lseek, 3068 .release = seq_release_net, 3069 }; 3070 3071 static int __net_init if6_proc_net_init(struct net *net) 3072 { 3073 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3074 return -ENOMEM; 3075 return 0; 3076 } 3077 3078 static void __net_exit if6_proc_net_exit(struct net *net) 3079 { 3080 proc_net_remove(net, "if_inet6"); 3081 } 3082 3083 static struct pernet_operations if6_proc_net_ops = { 3084 .init = if6_proc_net_init, 3085 .exit = if6_proc_net_exit, 3086 }; 3087 3088 int __init if6_proc_init(void) 3089 { 3090 return register_pernet_subsys(&if6_proc_net_ops); 3091 } 3092 3093 void if6_proc_exit(void) 3094 { 3095 unregister_pernet_subsys(&if6_proc_net_ops); 3096 } 3097 #endif /* CONFIG_PROC_FS */ 3098 3099 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3100 /* Check if address is a home address configured on any interface. */ 3101 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3102 { 3103 int ret = 0; 3104 struct inet6_ifaddr * ifp; 3105 u8 hash = ipv6_addr_hash(addr); 3106 read_lock_bh(&addrconf_hash_lock); 3107 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 3108 if (!net_eq(dev_net(ifp->idev->dev), net)) 3109 continue; 3110 if (ipv6_addr_equal(&ifp->addr, addr) && 3111 (ifp->flags & IFA_F_HOMEADDRESS)) { 3112 ret = 1; 3113 break; 3114 } 3115 } 3116 read_unlock_bh(&addrconf_hash_lock); 3117 return ret; 3118 } 3119 #endif 3120 3121 /* 3122 * Periodic address status verification 3123 */ 3124 3125 static void addrconf_verify(unsigned long foo) 3126 { 3127 struct inet6_ifaddr *ifp; 3128 unsigned long now, next; 3129 int i; 3130 3131 spin_lock_bh(&addrconf_verify_lock); 3132 now = jiffies; 3133 next = now + ADDR_CHECK_FREQUENCY; 3134 3135 del_timer(&addr_chk_timer); 3136 3137 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3138 3139 restart: 3140 read_lock(&addrconf_hash_lock); 3141 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3142 unsigned long age; 3143 #ifdef CONFIG_IPV6_PRIVACY 3144 unsigned long regen_advance; 3145 #endif 3146 3147 if (ifp->flags & IFA_F_PERMANENT) 3148 continue; 3149 3150 spin_lock(&ifp->lock); 3151 age = (now - ifp->tstamp) / HZ; 3152 3153 #ifdef CONFIG_IPV6_PRIVACY 3154 regen_advance = ifp->idev->cnf.regen_max_retry * 3155 ifp->idev->cnf.dad_transmits * 3156 ifp->idev->nd_parms->retrans_time / HZ; 3157 #endif 3158 3159 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3160 age >= ifp->valid_lft) { 3161 spin_unlock(&ifp->lock); 3162 in6_ifa_hold(ifp); 3163 read_unlock(&addrconf_hash_lock); 3164 ipv6_del_addr(ifp); 3165 goto restart; 3166 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3167 spin_unlock(&ifp->lock); 3168 continue; 3169 } else if (age >= ifp->prefered_lft) { 3170 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3171 int deprecate = 0; 3172 3173 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3174 deprecate = 1; 3175 ifp->flags |= IFA_F_DEPRECATED; 3176 } 3177 3178 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3179 next = ifp->tstamp + ifp->valid_lft * HZ; 3180 3181 spin_unlock(&ifp->lock); 3182 3183 if (deprecate) { 3184 in6_ifa_hold(ifp); 3185 read_unlock(&addrconf_hash_lock); 3186 3187 ipv6_ifa_notify(0, ifp); 3188 in6_ifa_put(ifp); 3189 goto restart; 3190 } 3191 #ifdef CONFIG_IPV6_PRIVACY 3192 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3193 !(ifp->flags&IFA_F_TENTATIVE)) { 3194 if (age >= ifp->prefered_lft - regen_advance) { 3195 struct inet6_ifaddr *ifpub = ifp->ifpub; 3196 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3197 next = ifp->tstamp + ifp->prefered_lft * HZ; 3198 if (!ifp->regen_count && ifpub) { 3199 ifp->regen_count++; 3200 in6_ifa_hold(ifp); 3201 in6_ifa_hold(ifpub); 3202 spin_unlock(&ifp->lock); 3203 read_unlock(&addrconf_hash_lock); 3204 spin_lock(&ifpub->lock); 3205 ifpub->regen_count = 0; 3206 spin_unlock(&ifpub->lock); 3207 ipv6_create_tempaddr(ifpub, ifp); 3208 in6_ifa_put(ifpub); 3209 in6_ifa_put(ifp); 3210 goto restart; 3211 } 3212 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3213 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3214 spin_unlock(&ifp->lock); 3215 #endif 3216 } else { 3217 /* ifp->prefered_lft <= ifp->valid_lft */ 3218 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3219 next = ifp->tstamp + ifp->prefered_lft * HZ; 3220 spin_unlock(&ifp->lock); 3221 } 3222 } 3223 read_unlock(&addrconf_hash_lock); 3224 } 3225 3226 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3227 add_timer(&addr_chk_timer); 3228 spin_unlock_bh(&addrconf_verify_lock); 3229 } 3230 3231 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3232 { 3233 struct in6_addr *pfx = NULL; 3234 3235 if (addr) 3236 pfx = nla_data(addr); 3237 3238 if (local) { 3239 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3240 pfx = NULL; 3241 else 3242 pfx = nla_data(local); 3243 } 3244 3245 return pfx; 3246 } 3247 3248 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3249 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3250 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3251 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3252 }; 3253 3254 static int 3255 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3256 { 3257 struct net *net = sock_net(skb->sk); 3258 struct ifaddrmsg *ifm; 3259 struct nlattr *tb[IFA_MAX+1]; 3260 struct in6_addr *pfx; 3261 int err; 3262 3263 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3264 if (err < 0) 3265 return err; 3266 3267 ifm = nlmsg_data(nlh); 3268 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3269 if (pfx == NULL) 3270 return -EINVAL; 3271 3272 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3273 } 3274 3275 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3276 u32 prefered_lft, u32 valid_lft) 3277 { 3278 u32 flags; 3279 clock_t expires; 3280 unsigned long timeout; 3281 3282 if (!valid_lft || (prefered_lft > valid_lft)) 3283 return -EINVAL; 3284 3285 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3286 if (addrconf_finite_timeout(timeout)) { 3287 expires = jiffies_to_clock_t(timeout * HZ); 3288 valid_lft = timeout; 3289 flags = RTF_EXPIRES; 3290 } else { 3291 expires = 0; 3292 flags = 0; 3293 ifa_flags |= IFA_F_PERMANENT; 3294 } 3295 3296 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3297 if (addrconf_finite_timeout(timeout)) { 3298 if (timeout == 0) 3299 ifa_flags |= IFA_F_DEPRECATED; 3300 prefered_lft = timeout; 3301 } 3302 3303 spin_lock_bh(&ifp->lock); 3304 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3305 ifp->tstamp = jiffies; 3306 ifp->valid_lft = valid_lft; 3307 ifp->prefered_lft = prefered_lft; 3308 3309 spin_unlock_bh(&ifp->lock); 3310 if (!(ifp->flags&IFA_F_TENTATIVE)) 3311 ipv6_ifa_notify(0, ifp); 3312 3313 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3314 expires, flags); 3315 addrconf_verify(0); 3316 3317 return 0; 3318 } 3319 3320 static int 3321 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3322 { 3323 struct net *net = sock_net(skb->sk); 3324 struct ifaddrmsg *ifm; 3325 struct nlattr *tb[IFA_MAX+1]; 3326 struct in6_addr *pfx; 3327 struct inet6_ifaddr *ifa; 3328 struct net_device *dev; 3329 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3330 u8 ifa_flags; 3331 int err; 3332 3333 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3334 if (err < 0) 3335 return err; 3336 3337 ifm = nlmsg_data(nlh); 3338 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3339 if (pfx == NULL) 3340 return -EINVAL; 3341 3342 if (tb[IFA_CACHEINFO]) { 3343 struct ifa_cacheinfo *ci; 3344 3345 ci = nla_data(tb[IFA_CACHEINFO]); 3346 valid_lft = ci->ifa_valid; 3347 preferred_lft = ci->ifa_prefered; 3348 } else { 3349 preferred_lft = INFINITY_LIFE_TIME; 3350 valid_lft = INFINITY_LIFE_TIME; 3351 } 3352 3353 dev = __dev_get_by_index(net, ifm->ifa_index); 3354 if (dev == NULL) 3355 return -ENODEV; 3356 3357 /* We ignore other flags so far. */ 3358 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3359 3360 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3361 if (ifa == NULL) { 3362 /* 3363 * It would be best to check for !NLM_F_CREATE here but 3364 * userspace alreay relies on not having to provide this. 3365 */ 3366 return inet6_addr_add(net, ifm->ifa_index, pfx, 3367 ifm->ifa_prefixlen, ifa_flags, 3368 preferred_lft, valid_lft); 3369 } 3370 3371 if (nlh->nlmsg_flags & NLM_F_EXCL || 3372 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3373 err = -EEXIST; 3374 else 3375 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3376 3377 in6_ifa_put(ifa); 3378 3379 return err; 3380 } 3381 3382 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3383 u8 scope, int ifindex) 3384 { 3385 struct ifaddrmsg *ifm; 3386 3387 ifm = nlmsg_data(nlh); 3388 ifm->ifa_family = AF_INET6; 3389 ifm->ifa_prefixlen = prefixlen; 3390 ifm->ifa_flags = flags; 3391 ifm->ifa_scope = scope; 3392 ifm->ifa_index = ifindex; 3393 } 3394 3395 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3396 unsigned long tstamp, u32 preferred, u32 valid) 3397 { 3398 struct ifa_cacheinfo ci; 3399 3400 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3401 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3402 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3403 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3404 ci.ifa_prefered = preferred; 3405 ci.ifa_valid = valid; 3406 3407 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3408 } 3409 3410 static inline int rt_scope(int ifa_scope) 3411 { 3412 if (ifa_scope & IFA_HOST) 3413 return RT_SCOPE_HOST; 3414 else if (ifa_scope & IFA_LINK) 3415 return RT_SCOPE_LINK; 3416 else if (ifa_scope & IFA_SITE) 3417 return RT_SCOPE_SITE; 3418 else 3419 return RT_SCOPE_UNIVERSE; 3420 } 3421 3422 static inline int inet6_ifaddr_msgsize(void) 3423 { 3424 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3425 + nla_total_size(16) /* IFA_ADDRESS */ 3426 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3427 } 3428 3429 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3430 u32 pid, u32 seq, int event, unsigned int flags) 3431 { 3432 struct nlmsghdr *nlh; 3433 u32 preferred, valid; 3434 3435 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3436 if (nlh == NULL) 3437 return -EMSGSIZE; 3438 3439 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3440 ifa->idev->dev->ifindex); 3441 3442 if (!(ifa->flags&IFA_F_PERMANENT)) { 3443 preferred = ifa->prefered_lft; 3444 valid = ifa->valid_lft; 3445 if (preferred != INFINITY_LIFE_TIME) { 3446 long tval = (jiffies - ifa->tstamp)/HZ; 3447 if (preferred > tval) 3448 preferred -= tval; 3449 else 3450 preferred = 0; 3451 if (valid != INFINITY_LIFE_TIME) 3452 valid -= tval; 3453 } 3454 } else { 3455 preferred = INFINITY_LIFE_TIME; 3456 valid = INFINITY_LIFE_TIME; 3457 } 3458 3459 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3460 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3461 nlmsg_cancel(skb, nlh); 3462 return -EMSGSIZE; 3463 } 3464 3465 return nlmsg_end(skb, nlh); 3466 } 3467 3468 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3469 u32 pid, u32 seq, int event, u16 flags) 3470 { 3471 struct nlmsghdr *nlh; 3472 u8 scope = RT_SCOPE_UNIVERSE; 3473 int ifindex = ifmca->idev->dev->ifindex; 3474 3475 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3476 scope = RT_SCOPE_SITE; 3477 3478 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3479 if (nlh == NULL) 3480 return -EMSGSIZE; 3481 3482 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3483 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3484 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3485 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3486 nlmsg_cancel(skb, nlh); 3487 return -EMSGSIZE; 3488 } 3489 3490 return nlmsg_end(skb, nlh); 3491 } 3492 3493 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3494 u32 pid, u32 seq, int event, unsigned int flags) 3495 { 3496 struct nlmsghdr *nlh; 3497 u8 scope = RT_SCOPE_UNIVERSE; 3498 int ifindex = ifaca->aca_idev->dev->ifindex; 3499 3500 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3501 scope = RT_SCOPE_SITE; 3502 3503 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3504 if (nlh == NULL) 3505 return -EMSGSIZE; 3506 3507 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3508 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3509 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3510 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3511 nlmsg_cancel(skb, nlh); 3512 return -EMSGSIZE; 3513 } 3514 3515 return nlmsg_end(skb, nlh); 3516 } 3517 3518 enum addr_type_t 3519 { 3520 UNICAST_ADDR, 3521 MULTICAST_ADDR, 3522 ANYCAST_ADDR, 3523 }; 3524 3525 /* called with rcu_read_lock() */ 3526 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3527 struct netlink_callback *cb, enum addr_type_t type, 3528 int s_ip_idx, int *p_ip_idx) 3529 { 3530 struct inet6_ifaddr *ifa; 3531 struct ifmcaddr6 *ifmca; 3532 struct ifacaddr6 *ifaca; 3533 int err = 1; 3534 int ip_idx = *p_ip_idx; 3535 3536 read_lock_bh(&idev->lock); 3537 switch (type) { 3538 case UNICAST_ADDR: 3539 /* unicast address incl. temp addr */ 3540 for (ifa = idev->addr_list; ifa; 3541 ifa = ifa->if_next, ip_idx++) { 3542 if (ip_idx < s_ip_idx) 3543 continue; 3544 err = inet6_fill_ifaddr(skb, ifa, 3545 NETLINK_CB(cb->skb).pid, 3546 cb->nlh->nlmsg_seq, 3547 RTM_NEWADDR, 3548 NLM_F_MULTI); 3549 if (err <= 0) 3550 break; 3551 } 3552 break; 3553 case MULTICAST_ADDR: 3554 /* multicast address */ 3555 for (ifmca = idev->mc_list; ifmca; 3556 ifmca = ifmca->next, ip_idx++) { 3557 if (ip_idx < s_ip_idx) 3558 continue; 3559 err = inet6_fill_ifmcaddr(skb, ifmca, 3560 NETLINK_CB(cb->skb).pid, 3561 cb->nlh->nlmsg_seq, 3562 RTM_GETMULTICAST, 3563 NLM_F_MULTI); 3564 if (err <= 0) 3565 break; 3566 } 3567 break; 3568 case ANYCAST_ADDR: 3569 /* anycast address */ 3570 for (ifaca = idev->ac_list; ifaca; 3571 ifaca = ifaca->aca_next, ip_idx++) { 3572 if (ip_idx < s_ip_idx) 3573 continue; 3574 err = inet6_fill_ifacaddr(skb, ifaca, 3575 NETLINK_CB(cb->skb).pid, 3576 cb->nlh->nlmsg_seq, 3577 RTM_GETANYCAST, 3578 NLM_F_MULTI); 3579 if (err <= 0) 3580 break; 3581 } 3582 break; 3583 default: 3584 break; 3585 } 3586 read_unlock_bh(&idev->lock); 3587 *p_ip_idx = ip_idx; 3588 return err; 3589 } 3590 3591 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3592 enum addr_type_t type) 3593 { 3594 struct net *net = sock_net(skb->sk); 3595 int h, s_h; 3596 int idx, ip_idx; 3597 int s_idx, s_ip_idx; 3598 struct net_device *dev; 3599 struct inet6_dev *idev; 3600 struct hlist_head *head; 3601 struct hlist_node *node; 3602 3603 s_h = cb->args[0]; 3604 s_idx = idx = cb->args[1]; 3605 s_ip_idx = ip_idx = cb->args[2]; 3606 3607 rcu_read_lock(); 3608 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3609 idx = 0; 3610 head = &net->dev_index_head[h]; 3611 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3612 if (idx < s_idx) 3613 goto cont; 3614 if (h > s_h || idx > s_idx) 3615 s_ip_idx = 0; 3616 ip_idx = 0; 3617 if ((idev = __in6_dev_get(dev)) == NULL) 3618 goto cont; 3619 3620 if (in6_dump_addrs(idev, skb, cb, type, 3621 s_ip_idx, &ip_idx) <= 0) 3622 goto done; 3623 cont: 3624 idx++; 3625 } 3626 } 3627 done: 3628 rcu_read_unlock(); 3629 cb->args[0] = h; 3630 cb->args[1] = idx; 3631 cb->args[2] = ip_idx; 3632 3633 return skb->len; 3634 } 3635 3636 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3637 { 3638 enum addr_type_t type = UNICAST_ADDR; 3639 3640 return inet6_dump_addr(skb, cb, type); 3641 } 3642 3643 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3644 { 3645 enum addr_type_t type = MULTICAST_ADDR; 3646 3647 return inet6_dump_addr(skb, cb, type); 3648 } 3649 3650 3651 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3652 { 3653 enum addr_type_t type = ANYCAST_ADDR; 3654 3655 return inet6_dump_addr(skb, cb, type); 3656 } 3657 3658 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3659 void *arg) 3660 { 3661 struct net *net = sock_net(in_skb->sk); 3662 struct ifaddrmsg *ifm; 3663 struct nlattr *tb[IFA_MAX+1]; 3664 struct in6_addr *addr = NULL; 3665 struct net_device *dev = NULL; 3666 struct inet6_ifaddr *ifa; 3667 struct sk_buff *skb; 3668 int err; 3669 3670 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3671 if (err < 0) 3672 goto errout; 3673 3674 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3675 if (addr == NULL) { 3676 err = -EINVAL; 3677 goto errout; 3678 } 3679 3680 ifm = nlmsg_data(nlh); 3681 if (ifm->ifa_index) 3682 dev = __dev_get_by_index(net, ifm->ifa_index); 3683 3684 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3685 err = -EADDRNOTAVAIL; 3686 goto errout; 3687 } 3688 3689 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3690 err = -ENOBUFS; 3691 goto errout_ifa; 3692 } 3693 3694 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3695 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3696 if (err < 0) { 3697 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3698 WARN_ON(err == -EMSGSIZE); 3699 kfree_skb(skb); 3700 goto errout_ifa; 3701 } 3702 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3703 errout_ifa: 3704 in6_ifa_put(ifa); 3705 errout: 3706 return err; 3707 } 3708 3709 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3710 { 3711 struct sk_buff *skb; 3712 struct net *net = dev_net(ifa->idev->dev); 3713 int err = -ENOBUFS; 3714 3715 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3716 if (skb == NULL) 3717 goto errout; 3718 3719 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3720 if (err < 0) { 3721 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3722 WARN_ON(err == -EMSGSIZE); 3723 kfree_skb(skb); 3724 goto errout; 3725 } 3726 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3727 return; 3728 errout: 3729 if (err < 0) 3730 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3731 } 3732 3733 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3734 __s32 *array, int bytes) 3735 { 3736 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3737 3738 memset(array, 0, bytes); 3739 array[DEVCONF_FORWARDING] = cnf->forwarding; 3740 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3741 array[DEVCONF_MTU6] = cnf->mtu6; 3742 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3743 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3744 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3745 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3746 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3747 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3748 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3749 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3750 #ifdef CONFIG_IPV6_PRIVACY 3751 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3752 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3753 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3754 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3755 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3756 #endif 3757 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3758 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3759 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3760 #ifdef CONFIG_IPV6_ROUTER_PREF 3761 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3762 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3763 #ifdef CONFIG_IPV6_ROUTE_INFO 3764 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3765 #endif 3766 #endif 3767 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3768 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3769 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3770 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3771 #endif 3772 #ifdef CONFIG_IPV6_MROUTE 3773 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3774 #endif 3775 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3776 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3777 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3778 } 3779 3780 static inline size_t inet6_if_nlmsg_size(void) 3781 { 3782 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3783 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3784 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3785 + nla_total_size(4) /* IFLA_MTU */ 3786 + nla_total_size(4) /* IFLA_LINK */ 3787 + nla_total_size( /* IFLA_PROTINFO */ 3788 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3789 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3790 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3791 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3792 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3793 ); 3794 } 3795 3796 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib, 3797 int items, int bytes) 3798 { 3799 int i; 3800 int pad = bytes - sizeof(u64) * items; 3801 BUG_ON(pad < 0); 3802 3803 /* Use put_unaligned() because stats may not be aligned for u64. */ 3804 put_unaligned(items, &stats[0]); 3805 for (i = 1; i < items; i++) 3806 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3807 3808 memset(&stats[items], 0, pad); 3809 } 3810 3811 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3812 int bytes) 3813 { 3814 switch(attrtype) { 3815 case IFLA_INET6_STATS: 3816 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3817 break; 3818 case IFLA_INET6_ICMP6STATS: 3819 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3820 break; 3821 } 3822 } 3823 3824 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3825 u32 pid, u32 seq, int event, unsigned int flags) 3826 { 3827 struct net_device *dev = idev->dev; 3828 struct nlattr *nla; 3829 struct ifinfomsg *hdr; 3830 struct nlmsghdr *nlh; 3831 void *protoinfo; 3832 struct ifla_cacheinfo ci; 3833 3834 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3835 if (nlh == NULL) 3836 return -EMSGSIZE; 3837 3838 hdr = nlmsg_data(nlh); 3839 hdr->ifi_family = AF_INET6; 3840 hdr->__ifi_pad = 0; 3841 hdr->ifi_type = dev->type; 3842 hdr->ifi_index = dev->ifindex; 3843 hdr->ifi_flags = dev_get_flags(dev); 3844 hdr->ifi_change = 0; 3845 3846 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3847 3848 if (dev->addr_len) 3849 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3850 3851 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3852 if (dev->ifindex != dev->iflink) 3853 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3854 3855 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3856 if (protoinfo == NULL) 3857 goto nla_put_failure; 3858 3859 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3860 3861 ci.max_reasm_len = IPV6_MAXPLEN; 3862 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3863 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3864 ci.reachable_time = idev->nd_parms->reachable_time; 3865 ci.retrans_time = idev->nd_parms->retrans_time; 3866 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3867 3868 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3869 if (nla == NULL) 3870 goto nla_put_failure; 3871 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3872 3873 /* XXX - MC not implemented */ 3874 3875 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3876 if (nla == NULL) 3877 goto nla_put_failure; 3878 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3879 3880 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3881 if (nla == NULL) 3882 goto nla_put_failure; 3883 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3884 3885 nla_nest_end(skb, protoinfo); 3886 return nlmsg_end(skb, nlh); 3887 3888 nla_put_failure: 3889 nlmsg_cancel(skb, nlh); 3890 return -EMSGSIZE; 3891 } 3892 3893 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3894 { 3895 struct net *net = sock_net(skb->sk); 3896 int h, s_h; 3897 int idx = 0, s_idx; 3898 struct net_device *dev; 3899 struct inet6_dev *idev; 3900 struct hlist_head *head; 3901 struct hlist_node *node; 3902 3903 s_h = cb->args[0]; 3904 s_idx = cb->args[1]; 3905 3906 rcu_read_lock(); 3907 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3908 idx = 0; 3909 head = &net->dev_index_head[h]; 3910 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3911 if (idx < s_idx) 3912 goto cont; 3913 idev = __in6_dev_get(dev); 3914 if (!idev) 3915 goto cont; 3916 if (inet6_fill_ifinfo(skb, idev, 3917 NETLINK_CB(cb->skb).pid, 3918 cb->nlh->nlmsg_seq, 3919 RTM_NEWLINK, NLM_F_MULTI) <= 0) 3920 goto out; 3921 cont: 3922 idx++; 3923 } 3924 } 3925 out: 3926 rcu_read_unlock(); 3927 cb->args[1] = idx; 3928 cb->args[0] = h; 3929 3930 return skb->len; 3931 } 3932 3933 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3934 { 3935 struct sk_buff *skb; 3936 struct net *net = dev_net(idev->dev); 3937 int err = -ENOBUFS; 3938 3939 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3940 if (skb == NULL) 3941 goto errout; 3942 3943 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3944 if (err < 0) { 3945 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3946 WARN_ON(err == -EMSGSIZE); 3947 kfree_skb(skb); 3948 goto errout; 3949 } 3950 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3951 return; 3952 errout: 3953 if (err < 0) 3954 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3955 } 3956 3957 static inline size_t inet6_prefix_nlmsg_size(void) 3958 { 3959 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3960 + nla_total_size(sizeof(struct in6_addr)) 3961 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3962 } 3963 3964 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3965 struct prefix_info *pinfo, u32 pid, u32 seq, 3966 int event, unsigned int flags) 3967 { 3968 struct prefixmsg *pmsg; 3969 struct nlmsghdr *nlh; 3970 struct prefix_cacheinfo ci; 3971 3972 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3973 if (nlh == NULL) 3974 return -EMSGSIZE; 3975 3976 pmsg = nlmsg_data(nlh); 3977 pmsg->prefix_family = AF_INET6; 3978 pmsg->prefix_pad1 = 0; 3979 pmsg->prefix_pad2 = 0; 3980 pmsg->prefix_ifindex = idev->dev->ifindex; 3981 pmsg->prefix_len = pinfo->prefix_len; 3982 pmsg->prefix_type = pinfo->type; 3983 pmsg->prefix_pad3 = 0; 3984 pmsg->prefix_flags = 0; 3985 if (pinfo->onlink) 3986 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3987 if (pinfo->autoconf) 3988 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3989 3990 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3991 3992 ci.preferred_time = ntohl(pinfo->prefered); 3993 ci.valid_time = ntohl(pinfo->valid); 3994 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3995 3996 return nlmsg_end(skb, nlh); 3997 3998 nla_put_failure: 3999 nlmsg_cancel(skb, nlh); 4000 return -EMSGSIZE; 4001 } 4002 4003 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4004 struct prefix_info *pinfo) 4005 { 4006 struct sk_buff *skb; 4007 struct net *net = dev_net(idev->dev); 4008 int err = -ENOBUFS; 4009 4010 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4011 if (skb == NULL) 4012 goto errout; 4013 4014 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4015 if (err < 0) { 4016 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4017 WARN_ON(err == -EMSGSIZE); 4018 kfree_skb(skb); 4019 goto errout; 4020 } 4021 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4022 return; 4023 errout: 4024 if (err < 0) 4025 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4026 } 4027 4028 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4029 { 4030 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4031 4032 switch (event) { 4033 case RTM_NEWADDR: 4034 /* 4035 * If the address was optimistic 4036 * we inserted the route at the start of 4037 * our DAD process, so we don't need 4038 * to do it again 4039 */ 4040 if (!(ifp->rt->rt6i_node)) 4041 ip6_ins_rt(ifp->rt); 4042 if (ifp->idev->cnf.forwarding) 4043 addrconf_join_anycast(ifp); 4044 break; 4045 case RTM_DELADDR: 4046 if (ifp->idev->cnf.forwarding) 4047 addrconf_leave_anycast(ifp); 4048 addrconf_leave_solict(ifp->idev, &ifp->addr); 4049 dst_hold(&ifp->rt->u.dst); 4050 if (ip6_del_rt(ifp->rt)) 4051 dst_free(&ifp->rt->u.dst); 4052 break; 4053 } 4054 } 4055 4056 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4057 { 4058 rcu_read_lock_bh(); 4059 if (likely(ifp->idev->dead == 0)) 4060 __ipv6_ifa_notify(event, ifp); 4061 rcu_read_unlock_bh(); 4062 } 4063 4064 #ifdef CONFIG_SYSCTL 4065 4066 static 4067 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4068 void __user *buffer, size_t *lenp, loff_t *ppos) 4069 { 4070 int *valp = ctl->data; 4071 int val = *valp; 4072 loff_t pos = *ppos; 4073 int ret; 4074 4075 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4076 4077 if (write) 4078 ret = addrconf_fixup_forwarding(ctl, valp, val); 4079 if (ret) 4080 *ppos = pos; 4081 return ret; 4082 } 4083 4084 static void dev_disable_change(struct inet6_dev *idev) 4085 { 4086 if (!idev || !idev->dev) 4087 return; 4088 4089 if (idev->cnf.disable_ipv6) 4090 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4091 else 4092 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4093 } 4094 4095 static void addrconf_disable_change(struct net *net, __s32 newf) 4096 { 4097 struct net_device *dev; 4098 struct inet6_dev *idev; 4099 4100 rcu_read_lock(); 4101 for_each_netdev_rcu(net, dev) { 4102 idev = __in6_dev_get(dev); 4103 if (idev) { 4104 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4105 idev->cnf.disable_ipv6 = newf; 4106 if (changed) 4107 dev_disable_change(idev); 4108 } 4109 } 4110 rcu_read_unlock(); 4111 } 4112 4113 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4114 { 4115 struct net *net; 4116 4117 net = (struct net *)table->extra2; 4118 4119 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4120 return 0; 4121 4122 if (!rtnl_trylock()) { 4123 /* Restore the original values before restarting */ 4124 *p = old; 4125 return restart_syscall(); 4126 } 4127 4128 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4129 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4130 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4131 addrconf_disable_change(net, newf); 4132 } else if ((!*p) ^ (!old)) 4133 dev_disable_change((struct inet6_dev *)table->extra1); 4134 4135 rtnl_unlock(); 4136 return 0; 4137 } 4138 4139 static 4140 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4141 void __user *buffer, size_t *lenp, loff_t *ppos) 4142 { 4143 int *valp = ctl->data; 4144 int val = *valp; 4145 loff_t pos = *ppos; 4146 int ret; 4147 4148 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4149 4150 if (write) 4151 ret = addrconf_disable_ipv6(ctl, valp, val); 4152 if (ret) 4153 *ppos = pos; 4154 return ret; 4155 } 4156 4157 static struct addrconf_sysctl_table 4158 { 4159 struct ctl_table_header *sysctl_header; 4160 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4161 char *dev_name; 4162 } addrconf_sysctl __read_mostly = { 4163 .sysctl_header = NULL, 4164 .addrconf_vars = { 4165 { 4166 .procname = "forwarding", 4167 .data = &ipv6_devconf.forwarding, 4168 .maxlen = sizeof(int), 4169 .mode = 0644, 4170 .proc_handler = addrconf_sysctl_forward, 4171 }, 4172 { 4173 .procname = "hop_limit", 4174 .data = &ipv6_devconf.hop_limit, 4175 .maxlen = sizeof(int), 4176 .mode = 0644, 4177 .proc_handler = proc_dointvec, 4178 }, 4179 { 4180 .procname = "mtu", 4181 .data = &ipv6_devconf.mtu6, 4182 .maxlen = sizeof(int), 4183 .mode = 0644, 4184 .proc_handler = proc_dointvec, 4185 }, 4186 { 4187 .procname = "accept_ra", 4188 .data = &ipv6_devconf.accept_ra, 4189 .maxlen = sizeof(int), 4190 .mode = 0644, 4191 .proc_handler = proc_dointvec, 4192 }, 4193 { 4194 .procname = "accept_redirects", 4195 .data = &ipv6_devconf.accept_redirects, 4196 .maxlen = sizeof(int), 4197 .mode = 0644, 4198 .proc_handler = proc_dointvec, 4199 }, 4200 { 4201 .procname = "autoconf", 4202 .data = &ipv6_devconf.autoconf, 4203 .maxlen = sizeof(int), 4204 .mode = 0644, 4205 .proc_handler = proc_dointvec, 4206 }, 4207 { 4208 .procname = "dad_transmits", 4209 .data = &ipv6_devconf.dad_transmits, 4210 .maxlen = sizeof(int), 4211 .mode = 0644, 4212 .proc_handler = proc_dointvec, 4213 }, 4214 { 4215 .procname = "router_solicitations", 4216 .data = &ipv6_devconf.rtr_solicits, 4217 .maxlen = sizeof(int), 4218 .mode = 0644, 4219 .proc_handler = proc_dointvec, 4220 }, 4221 { 4222 .procname = "router_solicitation_interval", 4223 .data = &ipv6_devconf.rtr_solicit_interval, 4224 .maxlen = sizeof(int), 4225 .mode = 0644, 4226 .proc_handler = proc_dointvec_jiffies, 4227 }, 4228 { 4229 .procname = "router_solicitation_delay", 4230 .data = &ipv6_devconf.rtr_solicit_delay, 4231 .maxlen = sizeof(int), 4232 .mode = 0644, 4233 .proc_handler = proc_dointvec_jiffies, 4234 }, 4235 { 4236 .procname = "force_mld_version", 4237 .data = &ipv6_devconf.force_mld_version, 4238 .maxlen = sizeof(int), 4239 .mode = 0644, 4240 .proc_handler = proc_dointvec, 4241 }, 4242 #ifdef CONFIG_IPV6_PRIVACY 4243 { 4244 .procname = "use_tempaddr", 4245 .data = &ipv6_devconf.use_tempaddr, 4246 .maxlen = sizeof(int), 4247 .mode = 0644, 4248 .proc_handler = proc_dointvec, 4249 }, 4250 { 4251 .procname = "temp_valid_lft", 4252 .data = &ipv6_devconf.temp_valid_lft, 4253 .maxlen = sizeof(int), 4254 .mode = 0644, 4255 .proc_handler = proc_dointvec, 4256 }, 4257 { 4258 .procname = "temp_prefered_lft", 4259 .data = &ipv6_devconf.temp_prefered_lft, 4260 .maxlen = sizeof(int), 4261 .mode = 0644, 4262 .proc_handler = proc_dointvec, 4263 }, 4264 { 4265 .procname = "regen_max_retry", 4266 .data = &ipv6_devconf.regen_max_retry, 4267 .maxlen = sizeof(int), 4268 .mode = 0644, 4269 .proc_handler = proc_dointvec, 4270 }, 4271 { 4272 .procname = "max_desync_factor", 4273 .data = &ipv6_devconf.max_desync_factor, 4274 .maxlen = sizeof(int), 4275 .mode = 0644, 4276 .proc_handler = proc_dointvec, 4277 }, 4278 #endif 4279 { 4280 .procname = "max_addresses", 4281 .data = &ipv6_devconf.max_addresses, 4282 .maxlen = sizeof(int), 4283 .mode = 0644, 4284 .proc_handler = proc_dointvec, 4285 }, 4286 { 4287 .procname = "accept_ra_defrtr", 4288 .data = &ipv6_devconf.accept_ra_defrtr, 4289 .maxlen = sizeof(int), 4290 .mode = 0644, 4291 .proc_handler = proc_dointvec, 4292 }, 4293 { 4294 .procname = "accept_ra_pinfo", 4295 .data = &ipv6_devconf.accept_ra_pinfo, 4296 .maxlen = sizeof(int), 4297 .mode = 0644, 4298 .proc_handler = proc_dointvec, 4299 }, 4300 #ifdef CONFIG_IPV6_ROUTER_PREF 4301 { 4302 .procname = "accept_ra_rtr_pref", 4303 .data = &ipv6_devconf.accept_ra_rtr_pref, 4304 .maxlen = sizeof(int), 4305 .mode = 0644, 4306 .proc_handler = proc_dointvec, 4307 }, 4308 { 4309 .procname = "router_probe_interval", 4310 .data = &ipv6_devconf.rtr_probe_interval, 4311 .maxlen = sizeof(int), 4312 .mode = 0644, 4313 .proc_handler = proc_dointvec_jiffies, 4314 }, 4315 #ifdef CONFIG_IPV6_ROUTE_INFO 4316 { 4317 .procname = "accept_ra_rt_info_max_plen", 4318 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4319 .maxlen = sizeof(int), 4320 .mode = 0644, 4321 .proc_handler = proc_dointvec, 4322 }, 4323 #endif 4324 #endif 4325 { 4326 .procname = "proxy_ndp", 4327 .data = &ipv6_devconf.proxy_ndp, 4328 .maxlen = sizeof(int), 4329 .mode = 0644, 4330 .proc_handler = proc_dointvec, 4331 }, 4332 { 4333 .procname = "accept_source_route", 4334 .data = &ipv6_devconf.accept_source_route, 4335 .maxlen = sizeof(int), 4336 .mode = 0644, 4337 .proc_handler = proc_dointvec, 4338 }, 4339 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4340 { 4341 .procname = "optimistic_dad", 4342 .data = &ipv6_devconf.optimistic_dad, 4343 .maxlen = sizeof(int), 4344 .mode = 0644, 4345 .proc_handler = proc_dointvec, 4346 4347 }, 4348 #endif 4349 #ifdef CONFIG_IPV6_MROUTE 4350 { 4351 .procname = "mc_forwarding", 4352 .data = &ipv6_devconf.mc_forwarding, 4353 .maxlen = sizeof(int), 4354 .mode = 0444, 4355 .proc_handler = proc_dointvec, 4356 }, 4357 #endif 4358 { 4359 .procname = "disable_ipv6", 4360 .data = &ipv6_devconf.disable_ipv6, 4361 .maxlen = sizeof(int), 4362 .mode = 0644, 4363 .proc_handler = addrconf_sysctl_disable, 4364 }, 4365 { 4366 .procname = "accept_dad", 4367 .data = &ipv6_devconf.accept_dad, 4368 .maxlen = sizeof(int), 4369 .mode = 0644, 4370 .proc_handler = proc_dointvec, 4371 }, 4372 { 4373 .procname = "force_tllao", 4374 .data = &ipv6_devconf.force_tllao, 4375 .maxlen = sizeof(int), 4376 .mode = 0644, 4377 .proc_handler = proc_dointvec 4378 }, 4379 { 4380 /* sentinel */ 4381 } 4382 }, 4383 }; 4384 4385 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4386 struct inet6_dev *idev, struct ipv6_devconf *p) 4387 { 4388 int i; 4389 struct addrconf_sysctl_table *t; 4390 4391 #define ADDRCONF_CTL_PATH_DEV 3 4392 4393 struct ctl_path addrconf_ctl_path[] = { 4394 { .procname = "net", }, 4395 { .procname = "ipv6", }, 4396 { .procname = "conf", }, 4397 { /* to be set */ }, 4398 { }, 4399 }; 4400 4401 4402 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4403 if (t == NULL) 4404 goto out; 4405 4406 for (i=0; t->addrconf_vars[i].data; i++) { 4407 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4408 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4409 t->addrconf_vars[i].extra2 = net; 4410 } 4411 4412 /* 4413 * Make a copy of dev_name, because '.procname' is regarded as const 4414 * by sysctl and we wouldn't want anyone to change it under our feet 4415 * (see SIOCSIFNAME). 4416 */ 4417 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4418 if (!t->dev_name) 4419 goto free; 4420 4421 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4422 4423 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4424 t->addrconf_vars); 4425 if (t->sysctl_header == NULL) 4426 goto free_procname; 4427 4428 p->sysctl = t; 4429 return 0; 4430 4431 free_procname: 4432 kfree(t->dev_name); 4433 free: 4434 kfree(t); 4435 out: 4436 return -ENOBUFS; 4437 } 4438 4439 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4440 { 4441 struct addrconf_sysctl_table *t; 4442 4443 if (p->sysctl == NULL) 4444 return; 4445 4446 t = p->sysctl; 4447 p->sysctl = NULL; 4448 unregister_sysctl_table(t->sysctl_header); 4449 kfree(t->dev_name); 4450 kfree(t); 4451 } 4452 4453 static void addrconf_sysctl_register(struct inet6_dev *idev) 4454 { 4455 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4456 &ndisc_ifinfo_sysctl_change); 4457 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4458 idev, &idev->cnf); 4459 } 4460 4461 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4462 { 4463 __addrconf_sysctl_unregister(&idev->cnf); 4464 neigh_sysctl_unregister(idev->nd_parms); 4465 } 4466 4467 4468 #endif 4469 4470 static int __net_init addrconf_init_net(struct net *net) 4471 { 4472 int err; 4473 struct ipv6_devconf *all, *dflt; 4474 4475 err = -ENOMEM; 4476 all = &ipv6_devconf; 4477 dflt = &ipv6_devconf_dflt; 4478 4479 if (!net_eq(net, &init_net)) { 4480 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4481 if (all == NULL) 4482 goto err_alloc_all; 4483 4484 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4485 if (dflt == NULL) 4486 goto err_alloc_dflt; 4487 } else { 4488 /* these will be inherited by all namespaces */ 4489 dflt->autoconf = ipv6_defaults.autoconf; 4490 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4491 } 4492 4493 net->ipv6.devconf_all = all; 4494 net->ipv6.devconf_dflt = dflt; 4495 4496 #ifdef CONFIG_SYSCTL 4497 err = __addrconf_sysctl_register(net, "all", NULL, all); 4498 if (err < 0) 4499 goto err_reg_all; 4500 4501 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4502 if (err < 0) 4503 goto err_reg_dflt; 4504 #endif 4505 return 0; 4506 4507 #ifdef CONFIG_SYSCTL 4508 err_reg_dflt: 4509 __addrconf_sysctl_unregister(all); 4510 err_reg_all: 4511 kfree(dflt); 4512 #endif 4513 err_alloc_dflt: 4514 kfree(all); 4515 err_alloc_all: 4516 return err; 4517 } 4518 4519 static void __net_exit addrconf_exit_net(struct net *net) 4520 { 4521 #ifdef CONFIG_SYSCTL 4522 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4523 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4524 #endif 4525 if (!net_eq(net, &init_net)) { 4526 kfree(net->ipv6.devconf_dflt); 4527 kfree(net->ipv6.devconf_all); 4528 } 4529 } 4530 4531 static struct pernet_operations addrconf_ops = { 4532 .init = addrconf_init_net, 4533 .exit = addrconf_exit_net, 4534 }; 4535 4536 /* 4537 * Device notifier 4538 */ 4539 4540 int register_inet6addr_notifier(struct notifier_block *nb) 4541 { 4542 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4543 } 4544 4545 EXPORT_SYMBOL(register_inet6addr_notifier); 4546 4547 int unregister_inet6addr_notifier(struct notifier_block *nb) 4548 { 4549 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4550 } 4551 4552 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4553 4554 /* 4555 * Init / cleanup code 4556 */ 4557 4558 int __init addrconf_init(void) 4559 { 4560 int err; 4561 4562 if ((err = ipv6_addr_label_init()) < 0) { 4563 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4564 err); 4565 return err; 4566 } 4567 4568 register_pernet_subsys(&addrconf_ops); 4569 4570 /* The addrconf netdev notifier requires that loopback_dev 4571 * has it's ipv6 private information allocated and setup 4572 * before it can bring up and give link-local addresses 4573 * to other devices which are up. 4574 * 4575 * Unfortunately, loopback_dev is not necessarily the first 4576 * entry in the global dev_base list of net devices. In fact, 4577 * it is likely to be the very last entry on that list. 4578 * So this causes the notifier registry below to try and 4579 * give link-local addresses to all devices besides loopback_dev 4580 * first, then loopback_dev, which cases all the non-loopback_dev 4581 * devices to fail to get a link-local address. 4582 * 4583 * So, as a temporary fix, allocate the ipv6 structure for 4584 * loopback_dev first by hand. 4585 * Longer term, all of the dependencies ipv6 has upon the loopback 4586 * device and it being up should be removed. 4587 */ 4588 rtnl_lock(); 4589 if (!ipv6_add_dev(init_net.loopback_dev)) 4590 err = -ENOMEM; 4591 rtnl_unlock(); 4592 if (err) 4593 goto errlo; 4594 4595 register_netdevice_notifier(&ipv6_dev_notf); 4596 4597 addrconf_verify(0); 4598 4599 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4600 if (err < 0) 4601 goto errout; 4602 4603 /* Only the first call to __rtnl_register can fail */ 4604 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4605 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4606 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4607 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4608 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4609 4610 ipv6_addr_label_rtnl_register(); 4611 4612 return 0; 4613 errout: 4614 unregister_netdevice_notifier(&ipv6_dev_notf); 4615 errlo: 4616 unregister_pernet_subsys(&addrconf_ops); 4617 4618 return err; 4619 } 4620 4621 void addrconf_cleanup(void) 4622 { 4623 struct inet6_ifaddr *ifa; 4624 struct net_device *dev; 4625 int i; 4626 4627 unregister_netdevice_notifier(&ipv6_dev_notf); 4628 unregister_pernet_subsys(&addrconf_ops); 4629 4630 rtnl_lock(); 4631 4632 /* clean dev list */ 4633 for_each_netdev(&init_net, dev) { 4634 if (__in6_dev_get(dev) == NULL) 4635 continue; 4636 addrconf_ifdown(dev, 1); 4637 } 4638 addrconf_ifdown(init_net.loopback_dev, 2); 4639 4640 /* 4641 * Check hash table. 4642 */ 4643 write_lock_bh(&addrconf_hash_lock); 4644 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4645 for (ifa=inet6_addr_lst[i]; ifa; ) { 4646 struct inet6_ifaddr *bifa; 4647 4648 bifa = ifa; 4649 ifa = ifa->lst_next; 4650 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4651 /* Do not free it; something is wrong. 4652 Now we can investigate it with debugger. 4653 */ 4654 } 4655 } 4656 write_unlock_bh(&addrconf_hash_lock); 4657 4658 del_timer(&addr_chk_timer); 4659 rtnl_unlock(); 4660 } 4661