1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #include <linux/errno.h> 42 #include <linux/types.h> 43 #include <linux/kernel.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #ifdef CONFIG_SYSCTL 57 #include <linux/sysctl.h> 58 #endif 59 #include <linux/capability.h> 60 #include <linux/delay.h> 61 #include <linux/notifier.h> 62 #include <linux/string.h> 63 64 #include <net/net_namespace.h> 65 #include <net/sock.h> 66 #include <net/snmp.h> 67 68 #include <net/ipv6.h> 69 #include <net/protocol.h> 70 #include <net/ndisc.h> 71 #include <net/ip6_route.h> 72 #include <net/addrconf.h> 73 #include <net/tcp.h> 74 #include <net/ip.h> 75 #include <net/netlink.h> 76 #include <net/pkt_sched.h> 77 #include <linux/if_tunnel.h> 78 #include <linux/rtnetlink.h> 79 80 #ifdef CONFIG_IPV6_PRIVACY 81 #include <linux/random.h> 82 #endif 83 84 #include <asm/uaccess.h> 85 #include <asm/unaligned.h> 86 87 #include <linux/proc_fs.h> 88 #include <linux/seq_file.h> 89 90 /* Set to 3 to get tracing... */ 91 #define ACONF_DEBUG 2 92 93 #if ACONF_DEBUG >= 3 94 #define ADBG(x) printk x 95 #else 96 #define ADBG(x) 97 #endif 98 99 #define INFINITY_LIFE_TIME 0xFFFFFFFF 100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 101 102 #ifdef CONFIG_SYSCTL 103 static void addrconf_sysctl_register(struct inet6_dev *idev); 104 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 105 #else 106 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 107 { 108 } 109 110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 111 { 112 } 113 #endif 114 115 #ifdef CONFIG_IPV6_PRIVACY 116 static int __ipv6_regen_rndid(struct inet6_dev *idev); 117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 118 static void ipv6_regen_rndid(unsigned long data); 119 120 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 121 #endif 122 123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 124 static int ipv6_count_addresses(struct inet6_dev *idev); 125 126 /* 127 * Configured unicast address hash table 128 */ 129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 130 static DEFINE_RWLOCK(addrconf_hash_lock); 131 132 static void addrconf_verify(unsigned long); 133 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 135 static DEFINE_SPINLOCK(addrconf_verify_lock); 136 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 139 140 static void addrconf_bonding_change(struct net_device *dev, 141 unsigned long event); 142 static int addrconf_ifdown(struct net_device *dev, int how); 143 144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 145 static void addrconf_dad_timer(unsigned long data); 146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 147 static void addrconf_dad_run(struct inet6_dev *idev); 148 static void addrconf_rs_timer(unsigned long data); 149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 151 152 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 153 struct prefix_info *pinfo); 154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 155 struct net_device *dev); 156 157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 158 159 static struct ipv6_devconf ipv6_devconf __read_mostly = { 160 .forwarding = 0, 161 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 162 .mtu6 = IPV6_MIN_MTU, 163 .accept_ra = 1, 164 .accept_redirects = 1, 165 .autoconf = 1, 166 .force_mld_version = 0, 167 .dad_transmits = 1, 168 .rtr_solicits = MAX_RTR_SOLICITATIONS, 169 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 170 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 171 #ifdef CONFIG_IPV6_PRIVACY 172 .use_tempaddr = 0, 173 .temp_valid_lft = TEMP_VALID_LIFETIME, 174 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 175 .regen_max_retry = REGEN_MAX_RETRY, 176 .max_desync_factor = MAX_DESYNC_FACTOR, 177 #endif 178 .max_addresses = IPV6_MAX_ADDRESSES, 179 .accept_ra_defrtr = 1, 180 .accept_ra_pinfo = 1, 181 #ifdef CONFIG_IPV6_ROUTER_PREF 182 .accept_ra_rtr_pref = 1, 183 .rtr_probe_interval = 60 * HZ, 184 #ifdef CONFIG_IPV6_ROUTE_INFO 185 .accept_ra_rt_info_max_plen = 0, 186 #endif 187 #endif 188 .proxy_ndp = 0, 189 .accept_source_route = 0, /* we do not accept RH0 by default. */ 190 .disable_ipv6 = 0, 191 .accept_dad = 1, 192 }; 193 194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 195 .forwarding = 0, 196 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 197 .mtu6 = IPV6_MIN_MTU, 198 .accept_ra = 1, 199 .accept_redirects = 1, 200 .autoconf = 1, 201 .dad_transmits = 1, 202 .rtr_solicits = MAX_RTR_SOLICITATIONS, 203 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 205 #ifdef CONFIG_IPV6_PRIVACY 206 .use_tempaddr = 0, 207 .temp_valid_lft = TEMP_VALID_LIFETIME, 208 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 209 .regen_max_retry = REGEN_MAX_RETRY, 210 .max_desync_factor = MAX_DESYNC_FACTOR, 211 #endif 212 .max_addresses = IPV6_MAX_ADDRESSES, 213 .accept_ra_defrtr = 1, 214 .accept_ra_pinfo = 1, 215 #ifdef CONFIG_IPV6_ROUTER_PREF 216 .accept_ra_rtr_pref = 1, 217 .rtr_probe_interval = 60 * HZ, 218 #ifdef CONFIG_IPV6_ROUTE_INFO 219 .accept_ra_rt_info_max_plen = 0, 220 #endif 221 #endif 222 .proxy_ndp = 0, 223 .accept_source_route = 0, /* we do not accept RH0 by default. */ 224 .disable_ipv6 = 0, 225 .accept_dad = 1, 226 }; 227 228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 233 234 /* Check if a valid qdisc is available */ 235 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 236 { 237 return !qdisc_tx_is_noop(dev); 238 } 239 240 /* Check if a route is valid prefix route */ 241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 242 { 243 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0); 244 } 245 246 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 247 { 248 if (del_timer(&ifp->timer)) 249 __in6_ifa_put(ifp); 250 } 251 252 enum addrconf_timer_t 253 { 254 AC_NONE, 255 AC_DAD, 256 AC_RS, 257 }; 258 259 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 260 enum addrconf_timer_t what, 261 unsigned long when) 262 { 263 if (!del_timer(&ifp->timer)) 264 in6_ifa_hold(ifp); 265 266 switch (what) { 267 case AC_DAD: 268 ifp->timer.function = addrconf_dad_timer; 269 break; 270 case AC_RS: 271 ifp->timer.function = addrconf_rs_timer; 272 break; 273 default:; 274 } 275 ifp->timer.expires = jiffies + when; 276 add_timer(&ifp->timer); 277 } 278 279 static int snmp6_alloc_dev(struct inet6_dev *idev) 280 { 281 if (snmp_mib_init((void **)idev->stats.ipv6, 282 sizeof(struct ipstats_mib)) < 0) 283 goto err_ip; 284 if (snmp_mib_init((void **)idev->stats.icmpv6, 285 sizeof(struct icmpv6_mib)) < 0) 286 goto err_icmp; 287 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 288 sizeof(struct icmpv6msg_mib)) < 0) 289 goto err_icmpmsg; 290 291 return 0; 292 293 err_icmpmsg: 294 snmp_mib_free((void **)idev->stats.icmpv6); 295 err_icmp: 296 snmp_mib_free((void **)idev->stats.ipv6); 297 err_ip: 298 return -ENOMEM; 299 } 300 301 static void snmp6_free_dev(struct inet6_dev *idev) 302 { 303 snmp_mib_free((void **)idev->stats.icmpv6msg); 304 snmp_mib_free((void **)idev->stats.icmpv6); 305 snmp_mib_free((void **)idev->stats.ipv6); 306 } 307 308 /* Nobody refers to this device, we may destroy it. */ 309 310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 311 { 312 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 313 kfree(idev); 314 } 315 316 void in6_dev_finish_destroy(struct inet6_dev *idev) 317 { 318 struct net_device *dev = idev->dev; 319 320 WARN_ON(idev->addr_list != NULL); 321 WARN_ON(idev->mc_list != NULL); 322 323 #ifdef NET_REFCNT_DEBUG 324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 325 #endif 326 dev_put(dev); 327 if (!idev->dead) { 328 printk("Freeing alive inet6 device %p\n", idev); 329 return; 330 } 331 snmp6_free_dev(idev); 332 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 333 } 334 335 EXPORT_SYMBOL(in6_dev_finish_destroy); 336 337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 338 { 339 struct inet6_dev *ndev; 340 341 ASSERT_RTNL(); 342 343 if (dev->mtu < IPV6_MIN_MTU) 344 return NULL; 345 346 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 347 348 if (ndev == NULL) 349 return NULL; 350 351 rwlock_init(&ndev->lock); 352 ndev->dev = dev; 353 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 354 ndev->cnf.mtu6 = dev->mtu; 355 ndev->cnf.sysctl = NULL; 356 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 357 if (ndev->nd_parms == NULL) { 358 kfree(ndev); 359 return NULL; 360 } 361 if (ndev->cnf.forwarding) 362 dev_disable_lro(dev); 363 /* We refer to the device */ 364 dev_hold(dev); 365 366 if (snmp6_alloc_dev(ndev) < 0) { 367 ADBG((KERN_WARNING 368 "%s(): cannot allocate memory for statistics; dev=%s.\n", 369 __func__, dev->name)); 370 neigh_parms_release(&nd_tbl, ndev->nd_parms); 371 ndev->dead = 1; 372 in6_dev_finish_destroy(ndev); 373 return NULL; 374 } 375 376 if (snmp6_register_dev(ndev) < 0) { 377 ADBG((KERN_WARNING 378 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 379 __func__, dev->name)); 380 neigh_parms_release(&nd_tbl, ndev->nd_parms); 381 ndev->dead = 1; 382 in6_dev_finish_destroy(ndev); 383 return NULL; 384 } 385 386 /* One reference from device. We must do this before 387 * we invoke __ipv6_regen_rndid(). 388 */ 389 in6_dev_hold(ndev); 390 391 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 392 ndev->cnf.accept_dad = -1; 393 394 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 395 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 396 printk(KERN_INFO 397 "%s: Disabled Multicast RS\n", 398 dev->name); 399 ndev->cnf.rtr_solicits = 0; 400 } 401 #endif 402 403 #ifdef CONFIG_IPV6_PRIVACY 404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 405 if ((dev->flags&IFF_LOOPBACK) || 406 dev->type == ARPHRD_TUNNEL || 407 dev->type == ARPHRD_TUNNEL6 || 408 dev->type == ARPHRD_SIT || 409 dev->type == ARPHRD_NONE) { 410 printk(KERN_INFO 411 "%s: Disabled Privacy Extensions\n", 412 dev->name); 413 ndev->cnf.use_tempaddr = -1; 414 } else { 415 in6_dev_hold(ndev); 416 ipv6_regen_rndid((unsigned long) ndev); 417 } 418 #endif 419 420 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 421 ndev->if_flags |= IF_READY; 422 423 ipv6_mc_init_dev(ndev); 424 ndev->tstamp = jiffies; 425 addrconf_sysctl_register(ndev); 426 /* protected by rtnl_lock */ 427 rcu_assign_pointer(dev->ip6_ptr, ndev); 428 429 /* Join all-node multicast group */ 430 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 431 432 return ndev; 433 } 434 435 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 436 { 437 struct inet6_dev *idev; 438 439 ASSERT_RTNL(); 440 441 if ((idev = __in6_dev_get(dev)) == NULL) { 442 if ((idev = ipv6_add_dev(dev)) == NULL) 443 return NULL; 444 } 445 446 if (dev->flags&IFF_UP) 447 ipv6_mc_up(idev); 448 return idev; 449 } 450 451 #ifdef CONFIG_SYSCTL 452 static void dev_forward_change(struct inet6_dev *idev) 453 { 454 struct net_device *dev; 455 struct inet6_ifaddr *ifa; 456 457 if (!idev) 458 return; 459 dev = idev->dev; 460 if (idev->cnf.forwarding) 461 dev_disable_lro(dev); 462 if (dev && (dev->flags & IFF_MULTICAST)) { 463 if (idev->cnf.forwarding) 464 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 465 else 466 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 467 } 468 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 469 if (ifa->flags&IFA_F_TENTATIVE) 470 continue; 471 if (idev->cnf.forwarding) 472 addrconf_join_anycast(ifa); 473 else 474 addrconf_leave_anycast(ifa); 475 } 476 } 477 478 479 static void addrconf_forward_change(struct net *net, __s32 newf) 480 { 481 struct net_device *dev; 482 struct inet6_dev *idev; 483 484 rcu_read_lock(); 485 for_each_netdev_rcu(net, dev) { 486 idev = __in6_dev_get(dev); 487 if (idev) { 488 int changed = (!idev->cnf.forwarding) ^ (!newf); 489 idev->cnf.forwarding = newf; 490 if (changed) 491 dev_forward_change(idev); 492 } 493 } 494 rcu_read_unlock(); 495 } 496 497 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 498 { 499 struct net *net; 500 501 net = (struct net *)table->extra2; 502 if (p == &net->ipv6.devconf_dflt->forwarding) 503 return 0; 504 505 if (!rtnl_trylock()) { 506 /* Restore the original values before restarting */ 507 *p = old; 508 return restart_syscall(); 509 } 510 511 if (p == &net->ipv6.devconf_all->forwarding) { 512 __s32 newf = net->ipv6.devconf_all->forwarding; 513 net->ipv6.devconf_dflt->forwarding = newf; 514 addrconf_forward_change(net, newf); 515 } else if ((!*p) ^ (!old)) 516 dev_forward_change((struct inet6_dev *)table->extra1); 517 rtnl_unlock(); 518 519 if (*p) 520 rt6_purge_dflt_routers(net); 521 return 1; 522 } 523 #endif 524 525 /* Nobody refers to this ifaddr, destroy it */ 526 527 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 528 { 529 WARN_ON(ifp->if_next != NULL); 530 WARN_ON(ifp->lst_next != NULL); 531 532 #ifdef NET_REFCNT_DEBUG 533 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 534 #endif 535 536 in6_dev_put(ifp->idev); 537 538 if (del_timer(&ifp->timer)) 539 printk("Timer is still running, when freeing ifa=%p\n", ifp); 540 541 if (!ifp->dead) { 542 printk("Freeing alive inet6 address %p\n", ifp); 543 return; 544 } 545 dst_release(&ifp->rt->u.dst); 546 547 kfree(ifp); 548 } 549 550 static void 551 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 552 { 553 struct inet6_ifaddr *ifa, **ifap; 554 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 555 556 /* 557 * Each device address list is sorted in order of scope - 558 * global before linklocal. 559 */ 560 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 561 ifap = &ifa->if_next) { 562 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 563 break; 564 } 565 566 ifp->if_next = *ifap; 567 *ifap = ifp; 568 } 569 570 /* 571 * Hash function taken from net_alias.c 572 */ 573 static u8 ipv6_addr_hash(const struct in6_addr *addr) 574 { 575 __u32 word; 576 577 /* 578 * We perform the hash function over the last 64 bits of the address 579 * This will include the IEEE address token on links that support it. 580 */ 581 582 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 583 word ^= (word >> 16); 584 word ^= (word >> 8); 585 586 return ((word ^ (word >> 4)) & 0x0f); 587 } 588 589 /* On success it returns ifp with increased reference count */ 590 591 static struct inet6_ifaddr * 592 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 593 int scope, u32 flags) 594 { 595 struct inet6_ifaddr *ifa = NULL; 596 struct rt6_info *rt; 597 int hash; 598 int err = 0; 599 int addr_type = ipv6_addr_type(addr); 600 601 if (addr_type == IPV6_ADDR_ANY || 602 addr_type & IPV6_ADDR_MULTICAST || 603 (!(idev->dev->flags & IFF_LOOPBACK) && 604 addr_type & IPV6_ADDR_LOOPBACK)) 605 return ERR_PTR(-EADDRNOTAVAIL); 606 607 rcu_read_lock_bh(); 608 if (idev->dead) { 609 err = -ENODEV; /*XXX*/ 610 goto out2; 611 } 612 613 if (idev->cnf.disable_ipv6) { 614 err = -EACCES; 615 goto out2; 616 } 617 618 write_lock(&addrconf_hash_lock); 619 620 /* Ignore adding duplicate addresses on an interface */ 621 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 622 ADBG(("ipv6_add_addr: already assigned\n")); 623 err = -EEXIST; 624 goto out; 625 } 626 627 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 628 629 if (ifa == NULL) { 630 ADBG(("ipv6_add_addr: malloc failed\n")); 631 err = -ENOBUFS; 632 goto out; 633 } 634 635 rt = addrconf_dst_alloc(idev, addr, 0); 636 if (IS_ERR(rt)) { 637 err = PTR_ERR(rt); 638 goto out; 639 } 640 641 ipv6_addr_copy(&ifa->addr, addr); 642 643 spin_lock_init(&ifa->lock); 644 init_timer(&ifa->timer); 645 ifa->timer.data = (unsigned long) ifa; 646 ifa->scope = scope; 647 ifa->prefix_len = pfxlen; 648 ifa->flags = flags | IFA_F_TENTATIVE; 649 ifa->cstamp = ifa->tstamp = jiffies; 650 651 ifa->rt = rt; 652 653 /* 654 * part one of RFC 4429, section 3.3 655 * We should not configure an address as 656 * optimistic if we do not yet know the link 657 * layer address of our nexhop router 658 */ 659 660 if (rt->rt6i_nexthop == NULL) 661 ifa->flags &= ~IFA_F_OPTIMISTIC; 662 663 ifa->idev = idev; 664 in6_dev_hold(idev); 665 /* For caller */ 666 in6_ifa_hold(ifa); 667 668 /* Add to big hash table */ 669 hash = ipv6_addr_hash(addr); 670 671 ifa->lst_next = inet6_addr_lst[hash]; 672 inet6_addr_lst[hash] = ifa; 673 in6_ifa_hold(ifa); 674 write_unlock(&addrconf_hash_lock); 675 676 write_lock(&idev->lock); 677 /* Add to inet6_dev unicast addr list. */ 678 ipv6_link_dev_addr(idev, ifa); 679 680 #ifdef CONFIG_IPV6_PRIVACY 681 if (ifa->flags&IFA_F_TEMPORARY) { 682 ifa->tmp_next = idev->tempaddr_list; 683 idev->tempaddr_list = ifa; 684 in6_ifa_hold(ifa); 685 } 686 #endif 687 688 in6_ifa_hold(ifa); 689 write_unlock(&idev->lock); 690 out2: 691 rcu_read_unlock_bh(); 692 693 if (likely(err == 0)) 694 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 695 else { 696 kfree(ifa); 697 ifa = ERR_PTR(err); 698 } 699 700 return ifa; 701 out: 702 write_unlock(&addrconf_hash_lock); 703 goto out2; 704 } 705 706 /* This function wants to get referenced ifp and releases it before return */ 707 708 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 709 { 710 struct inet6_ifaddr *ifa, **ifap; 711 struct inet6_dev *idev = ifp->idev; 712 int hash; 713 int deleted = 0, onlink = 0; 714 unsigned long expires = jiffies; 715 716 hash = ipv6_addr_hash(&ifp->addr); 717 718 ifp->dead = 1; 719 720 write_lock_bh(&addrconf_hash_lock); 721 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 722 ifap = &ifa->lst_next) { 723 if (ifa == ifp) { 724 *ifap = ifa->lst_next; 725 __in6_ifa_put(ifp); 726 ifa->lst_next = NULL; 727 break; 728 } 729 } 730 write_unlock_bh(&addrconf_hash_lock); 731 732 write_lock_bh(&idev->lock); 733 #ifdef CONFIG_IPV6_PRIVACY 734 if (ifp->flags&IFA_F_TEMPORARY) { 735 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 736 ifap = &ifa->tmp_next) { 737 if (ifa == ifp) { 738 *ifap = ifa->tmp_next; 739 if (ifp->ifpub) { 740 in6_ifa_put(ifp->ifpub); 741 ifp->ifpub = NULL; 742 } 743 __in6_ifa_put(ifp); 744 ifa->tmp_next = NULL; 745 break; 746 } 747 } 748 } 749 #endif 750 751 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 752 if (ifa == ifp) { 753 *ifap = ifa->if_next; 754 __in6_ifa_put(ifp); 755 ifa->if_next = NULL; 756 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 757 break; 758 deleted = 1; 759 continue; 760 } else if (ifp->flags & IFA_F_PERMANENT) { 761 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 762 ifp->prefix_len)) { 763 if (ifa->flags & IFA_F_PERMANENT) { 764 onlink = 1; 765 if (deleted) 766 break; 767 } else { 768 unsigned long lifetime; 769 770 if (!onlink) 771 onlink = -1; 772 773 spin_lock(&ifa->lock); 774 775 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 776 /* 777 * Note: Because this address is 778 * not permanent, lifetime < 779 * LONG_MAX / HZ here. 780 */ 781 if (time_before(expires, 782 ifa->tstamp + lifetime * HZ)) 783 expires = ifa->tstamp + lifetime * HZ; 784 spin_unlock(&ifa->lock); 785 } 786 } 787 } 788 ifap = &ifa->if_next; 789 } 790 write_unlock_bh(&idev->lock); 791 792 addrconf_del_timer(ifp); 793 794 ipv6_ifa_notify(RTM_DELADDR, ifp); 795 796 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 797 798 /* 799 * Purge or update corresponding prefix 800 * 801 * 1) we don't purge prefix here if address was not permanent. 802 * prefix is managed by its own lifetime. 803 * 2) if there're no addresses, delete prefix. 804 * 3) if there're still other permanent address(es), 805 * corresponding prefix is still permanent. 806 * 4) otherwise, update prefix lifetime to the 807 * longest valid lifetime among the corresponding 808 * addresses on the device. 809 * Note: subsequent RA will update lifetime. 810 * 811 * --yoshfuji 812 */ 813 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 814 struct in6_addr prefix; 815 struct rt6_info *rt; 816 struct net *net = dev_net(ifp->idev->dev); 817 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 818 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 819 820 if (rt && addrconf_is_prefix_route(rt)) { 821 if (onlink == 0) { 822 ip6_del_rt(rt); 823 rt = NULL; 824 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 825 rt->rt6i_expires = expires; 826 rt->rt6i_flags |= RTF_EXPIRES; 827 } 828 } 829 dst_release(&rt->u.dst); 830 } 831 832 in6_ifa_put(ifp); 833 } 834 835 #ifdef CONFIG_IPV6_PRIVACY 836 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 837 { 838 struct inet6_dev *idev = ifp->idev; 839 struct in6_addr addr, *tmpaddr; 840 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 841 unsigned long regen_advance; 842 int tmp_plen; 843 int ret = 0; 844 int max_addresses; 845 u32 addr_flags; 846 847 write_lock(&idev->lock); 848 if (ift) { 849 spin_lock_bh(&ift->lock); 850 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 851 spin_unlock_bh(&ift->lock); 852 tmpaddr = &addr; 853 } else { 854 tmpaddr = NULL; 855 } 856 retry: 857 in6_dev_hold(idev); 858 if (idev->cnf.use_tempaddr <= 0) { 859 write_unlock(&idev->lock); 860 printk(KERN_INFO 861 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 862 in6_dev_put(idev); 863 ret = -1; 864 goto out; 865 } 866 spin_lock_bh(&ifp->lock); 867 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 868 idev->cnf.use_tempaddr = -1; /*XXX*/ 869 spin_unlock_bh(&ifp->lock); 870 write_unlock(&idev->lock); 871 printk(KERN_WARNING 872 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 873 in6_dev_put(idev); 874 ret = -1; 875 goto out; 876 } 877 in6_ifa_hold(ifp); 878 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 879 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 880 spin_unlock_bh(&ifp->lock); 881 write_unlock(&idev->lock); 882 printk(KERN_WARNING 883 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 884 in6_ifa_put(ifp); 885 in6_dev_put(idev); 886 ret = -1; 887 goto out; 888 } 889 memcpy(&addr.s6_addr[8], idev->rndid, 8); 890 tmp_valid_lft = min_t(__u32, 891 ifp->valid_lft, 892 idev->cnf.temp_valid_lft); 893 tmp_prefered_lft = min_t(__u32, 894 ifp->prefered_lft, 895 idev->cnf.temp_prefered_lft - desync_factor / HZ); 896 tmp_plen = ifp->prefix_len; 897 max_addresses = idev->cnf.max_addresses; 898 tmp_cstamp = ifp->cstamp; 899 tmp_tstamp = ifp->tstamp; 900 spin_unlock_bh(&ifp->lock); 901 902 regen_advance = idev->cnf.regen_max_retry * 903 idev->cnf.dad_transmits * 904 idev->nd_parms->retrans_time / HZ; 905 write_unlock(&idev->lock); 906 907 /* A temporary address is created only if this calculated Preferred 908 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 909 * an implementation must not create a temporary address with a zero 910 * Preferred Lifetime. 911 */ 912 if (tmp_prefered_lft <= regen_advance) { 913 in6_ifa_put(ifp); 914 in6_dev_put(idev); 915 ret = -1; 916 goto out; 917 } 918 919 addr_flags = IFA_F_TEMPORARY; 920 /* set in addrconf_prefix_rcv() */ 921 if (ifp->flags & IFA_F_OPTIMISTIC) 922 addr_flags |= IFA_F_OPTIMISTIC; 923 924 ift = !max_addresses || 925 ipv6_count_addresses(idev) < max_addresses ? 926 ipv6_add_addr(idev, &addr, tmp_plen, 927 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 928 addr_flags) : NULL; 929 if (!ift || IS_ERR(ift)) { 930 in6_ifa_put(ifp); 931 in6_dev_put(idev); 932 printk(KERN_INFO 933 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 934 tmpaddr = &addr; 935 write_lock(&idev->lock); 936 goto retry; 937 } 938 939 spin_lock_bh(&ift->lock); 940 ift->ifpub = ifp; 941 ift->valid_lft = tmp_valid_lft; 942 ift->prefered_lft = tmp_prefered_lft; 943 ift->cstamp = tmp_cstamp; 944 ift->tstamp = tmp_tstamp; 945 spin_unlock_bh(&ift->lock); 946 947 addrconf_dad_start(ift, 0); 948 in6_ifa_put(ift); 949 in6_dev_put(idev); 950 out: 951 return ret; 952 } 953 #endif 954 955 /* 956 * Choose an appropriate source address (RFC3484) 957 */ 958 enum { 959 IPV6_SADDR_RULE_INIT = 0, 960 IPV6_SADDR_RULE_LOCAL, 961 IPV6_SADDR_RULE_SCOPE, 962 IPV6_SADDR_RULE_PREFERRED, 963 #ifdef CONFIG_IPV6_MIP6 964 IPV6_SADDR_RULE_HOA, 965 #endif 966 IPV6_SADDR_RULE_OIF, 967 IPV6_SADDR_RULE_LABEL, 968 #ifdef CONFIG_IPV6_PRIVACY 969 IPV6_SADDR_RULE_PRIVACY, 970 #endif 971 IPV6_SADDR_RULE_ORCHID, 972 IPV6_SADDR_RULE_PREFIX, 973 IPV6_SADDR_RULE_MAX 974 }; 975 976 struct ipv6_saddr_score { 977 int rule; 978 int addr_type; 979 struct inet6_ifaddr *ifa; 980 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 981 int scopedist; 982 int matchlen; 983 }; 984 985 struct ipv6_saddr_dst { 986 const struct in6_addr *addr; 987 int ifindex; 988 int scope; 989 int label; 990 unsigned int prefs; 991 }; 992 993 static inline int ipv6_saddr_preferred(int type) 994 { 995 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 996 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 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 in6_ifa_put(ifp); 1385 #ifdef CONFIG_IPV6_PRIVACY 1386 } else if (ifp->flags&IFA_F_TEMPORARY) { 1387 struct inet6_ifaddr *ifpub; 1388 spin_lock_bh(&ifp->lock); 1389 ifpub = ifp->ifpub; 1390 if (ifpub) { 1391 in6_ifa_hold(ifpub); 1392 spin_unlock_bh(&ifp->lock); 1393 ipv6_create_tempaddr(ifpub, ifp); 1394 in6_ifa_put(ifpub); 1395 } else { 1396 spin_unlock_bh(&ifp->lock); 1397 } 1398 ipv6_del_addr(ifp); 1399 #endif 1400 } else 1401 ipv6_del_addr(ifp); 1402 } 1403 1404 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1405 { 1406 struct inet6_dev *idev = ifp->idev; 1407 1408 if (net_ratelimit()) 1409 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1410 ifp->idev->dev->name, &ifp->addr); 1411 1412 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1413 struct in6_addr addr; 1414 1415 addr.s6_addr32[0] = htonl(0xfe800000); 1416 addr.s6_addr32[1] = 0; 1417 1418 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1419 ipv6_addr_equal(&ifp->addr, &addr)) { 1420 /* DAD failed for link-local based on MAC address */ 1421 idev->cnf.disable_ipv6 = 1; 1422 1423 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1424 ifp->idev->dev->name); 1425 } 1426 } 1427 1428 addrconf_dad_stop(ifp, 1); 1429 } 1430 1431 /* Join to solicited addr multicast group. */ 1432 1433 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1434 { 1435 struct in6_addr maddr; 1436 1437 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1438 return; 1439 1440 addrconf_addr_solict_mult(addr, &maddr); 1441 ipv6_dev_mc_inc(dev, &maddr); 1442 } 1443 1444 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1445 { 1446 struct in6_addr maddr; 1447 1448 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1449 return; 1450 1451 addrconf_addr_solict_mult(addr, &maddr); 1452 __ipv6_dev_mc_dec(idev, &maddr); 1453 } 1454 1455 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1456 { 1457 struct in6_addr addr; 1458 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1459 if (ipv6_addr_any(&addr)) 1460 return; 1461 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1462 } 1463 1464 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1465 { 1466 struct in6_addr addr; 1467 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1468 if (ipv6_addr_any(&addr)) 1469 return; 1470 __ipv6_dev_ac_dec(ifp->idev, &addr); 1471 } 1472 1473 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1474 { 1475 if (dev->addr_len != ETH_ALEN) 1476 return -1; 1477 memcpy(eui, dev->dev_addr, 3); 1478 memcpy(eui + 5, dev->dev_addr + 3, 3); 1479 1480 /* 1481 * The zSeries OSA network cards can be shared among various 1482 * OS instances, but the OSA cards have only one MAC address. 1483 * This leads to duplicate address conflicts in conjunction 1484 * with IPv6 if more than one instance uses the same card. 1485 * 1486 * The driver for these cards can deliver a unique 16-bit 1487 * identifier for each instance sharing the same card. It is 1488 * placed instead of 0xFFFE in the interface identifier. The 1489 * "u" bit of the interface identifier is not inverted in this 1490 * case. Hence the resulting interface identifier has local 1491 * scope according to RFC2373. 1492 */ 1493 if (dev->dev_id) { 1494 eui[3] = (dev->dev_id >> 8) & 0xFF; 1495 eui[4] = dev->dev_id & 0xFF; 1496 } else { 1497 eui[3] = 0xFF; 1498 eui[4] = 0xFE; 1499 eui[0] ^= 2; 1500 } 1501 return 0; 1502 } 1503 1504 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1505 { 1506 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1507 if (dev->addr_len != ARCNET_ALEN) 1508 return -1; 1509 memset(eui, 0, 7); 1510 eui[7] = *(u8*)dev->dev_addr; 1511 return 0; 1512 } 1513 1514 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1515 { 1516 if (dev->addr_len != INFINIBAND_ALEN) 1517 return -1; 1518 memcpy(eui, dev->dev_addr + 12, 8); 1519 eui[0] |= 2; 1520 return 0; 1521 } 1522 1523 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1524 { 1525 if (addr == 0) 1526 return -1; 1527 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1528 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1529 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1530 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1531 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1532 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1533 eui[1] = 0; 1534 eui[2] = 0x5E; 1535 eui[3] = 0xFE; 1536 memcpy(eui + 4, &addr, 4); 1537 return 0; 1538 } 1539 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1540 1541 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1542 { 1543 if (dev->priv_flags & IFF_ISATAP) 1544 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1545 return -1; 1546 } 1547 1548 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1549 { 1550 switch (dev->type) { 1551 case ARPHRD_ETHER: 1552 case ARPHRD_FDDI: 1553 case ARPHRD_IEEE802_TR: 1554 return addrconf_ifid_eui48(eui, dev); 1555 case ARPHRD_ARCNET: 1556 return addrconf_ifid_arcnet(eui, dev); 1557 case ARPHRD_INFINIBAND: 1558 return addrconf_ifid_infiniband(eui, dev); 1559 case ARPHRD_SIT: 1560 return addrconf_ifid_sit(eui, dev); 1561 } 1562 return -1; 1563 } 1564 1565 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1566 { 1567 int err = -1; 1568 struct inet6_ifaddr *ifp; 1569 1570 read_lock_bh(&idev->lock); 1571 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1572 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1573 memcpy(eui, ifp->addr.s6_addr+8, 8); 1574 err = 0; 1575 break; 1576 } 1577 } 1578 read_unlock_bh(&idev->lock); 1579 return err; 1580 } 1581 1582 #ifdef CONFIG_IPV6_PRIVACY 1583 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1584 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1585 { 1586 regen: 1587 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1588 idev->rndid[0] &= ~0x02; 1589 1590 /* 1591 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1592 * check if generated address is not inappropriate 1593 * 1594 * - Reserved subnet anycast (RFC 2526) 1595 * 11111101 11....11 1xxxxxxx 1596 * - ISATAP (RFC4214) 6.1 1597 * 00-00-5E-FE-xx-xx-xx-xx 1598 * - value 0 1599 * - XXX: already assigned to an address on the device 1600 */ 1601 if (idev->rndid[0] == 0xfd && 1602 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1603 (idev->rndid[7]&0x80)) 1604 goto regen; 1605 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1606 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1607 goto regen; 1608 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1609 goto regen; 1610 } 1611 1612 return 0; 1613 } 1614 1615 static void ipv6_regen_rndid(unsigned long data) 1616 { 1617 struct inet6_dev *idev = (struct inet6_dev *) data; 1618 unsigned long expires; 1619 1620 rcu_read_lock_bh(); 1621 write_lock_bh(&idev->lock); 1622 1623 if (idev->dead) 1624 goto out; 1625 1626 if (__ipv6_regen_rndid(idev) < 0) 1627 goto out; 1628 1629 expires = jiffies + 1630 idev->cnf.temp_prefered_lft * HZ - 1631 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1632 if (time_before(expires, jiffies)) { 1633 printk(KERN_WARNING 1634 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1635 idev->dev->name); 1636 goto out; 1637 } 1638 1639 if (!mod_timer(&idev->regen_timer, expires)) 1640 in6_dev_hold(idev); 1641 1642 out: 1643 write_unlock_bh(&idev->lock); 1644 rcu_read_unlock_bh(); 1645 in6_dev_put(idev); 1646 } 1647 1648 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1649 int ret = 0; 1650 1651 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1652 ret = __ipv6_regen_rndid(idev); 1653 return ret; 1654 } 1655 #endif 1656 1657 /* 1658 * Add prefix route. 1659 */ 1660 1661 static void 1662 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1663 unsigned long expires, u32 flags) 1664 { 1665 struct fib6_config cfg = { 1666 .fc_table = RT6_TABLE_PREFIX, 1667 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1668 .fc_ifindex = dev->ifindex, 1669 .fc_expires = expires, 1670 .fc_dst_len = plen, 1671 .fc_flags = RTF_UP | flags, 1672 .fc_nlinfo.nl_net = dev_net(dev), 1673 .fc_protocol = RTPROT_KERNEL, 1674 }; 1675 1676 ipv6_addr_copy(&cfg.fc_dst, pfx); 1677 1678 /* Prevent useless cloning on PtP SIT. 1679 This thing is done here expecting that the whole 1680 class of non-broadcast devices need not cloning. 1681 */ 1682 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1683 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1684 cfg.fc_flags |= RTF_NONEXTHOP; 1685 #endif 1686 1687 ip6_route_add(&cfg); 1688 } 1689 1690 /* Create "default" multicast route to the interface */ 1691 1692 static void addrconf_add_mroute(struct net_device *dev) 1693 { 1694 struct fib6_config cfg = { 1695 .fc_table = RT6_TABLE_LOCAL, 1696 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1697 .fc_ifindex = dev->ifindex, 1698 .fc_dst_len = 8, 1699 .fc_flags = RTF_UP, 1700 .fc_nlinfo.nl_net = dev_net(dev), 1701 }; 1702 1703 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1704 1705 ip6_route_add(&cfg); 1706 } 1707 1708 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1709 static void sit_route_add(struct net_device *dev) 1710 { 1711 struct fib6_config cfg = { 1712 .fc_table = RT6_TABLE_MAIN, 1713 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1714 .fc_ifindex = dev->ifindex, 1715 .fc_dst_len = 96, 1716 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1717 .fc_nlinfo.nl_net = dev_net(dev), 1718 }; 1719 1720 /* prefix length - 96 bits "::d.d.d.d" */ 1721 ip6_route_add(&cfg); 1722 } 1723 #endif 1724 1725 static void addrconf_add_lroute(struct net_device *dev) 1726 { 1727 struct in6_addr addr; 1728 1729 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1730 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1731 } 1732 1733 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1734 { 1735 struct inet6_dev *idev; 1736 1737 ASSERT_RTNL(); 1738 1739 if ((idev = ipv6_find_idev(dev)) == NULL) 1740 return NULL; 1741 1742 /* Add default multicast route */ 1743 addrconf_add_mroute(dev); 1744 1745 /* Add link local route */ 1746 addrconf_add_lroute(dev); 1747 return idev; 1748 } 1749 1750 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1751 { 1752 struct prefix_info *pinfo; 1753 __u32 valid_lft; 1754 __u32 prefered_lft; 1755 int addr_type; 1756 struct inet6_dev *in6_dev; 1757 struct net *net = dev_net(dev); 1758 1759 pinfo = (struct prefix_info *) opt; 1760 1761 if (len < sizeof(struct prefix_info)) { 1762 ADBG(("addrconf: prefix option too short\n")); 1763 return; 1764 } 1765 1766 /* 1767 * Validation checks ([ADDRCONF], page 19) 1768 */ 1769 1770 addr_type = ipv6_addr_type(&pinfo->prefix); 1771 1772 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1773 return; 1774 1775 valid_lft = ntohl(pinfo->valid); 1776 prefered_lft = ntohl(pinfo->prefered); 1777 1778 if (prefered_lft > valid_lft) { 1779 if (net_ratelimit()) 1780 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1781 return; 1782 } 1783 1784 in6_dev = in6_dev_get(dev); 1785 1786 if (in6_dev == NULL) { 1787 if (net_ratelimit()) 1788 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1789 return; 1790 } 1791 1792 /* 1793 * Two things going on here: 1794 * 1) Add routes for on-link prefixes 1795 * 2) Configure prefixes with the auto flag set 1796 */ 1797 1798 if (pinfo->onlink) { 1799 struct rt6_info *rt; 1800 unsigned long rt_expires; 1801 1802 /* Avoid arithmetic overflow. Really, we could 1803 * save rt_expires in seconds, likely valid_lft, 1804 * but it would require division in fib gc, that it 1805 * not good. 1806 */ 1807 if (HZ > USER_HZ) 1808 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1809 else 1810 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1811 1812 if (addrconf_finite_timeout(rt_expires)) 1813 rt_expires *= HZ; 1814 1815 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1816 dev->ifindex, 1); 1817 1818 if (rt && addrconf_is_prefix_route(rt)) { 1819 /* Autoconf prefix route */ 1820 if (valid_lft == 0) { 1821 ip6_del_rt(rt); 1822 rt = NULL; 1823 } else if (addrconf_finite_timeout(rt_expires)) { 1824 /* not infinity */ 1825 rt->rt6i_expires = jiffies + rt_expires; 1826 rt->rt6i_flags |= RTF_EXPIRES; 1827 } else { 1828 rt->rt6i_flags &= ~RTF_EXPIRES; 1829 rt->rt6i_expires = 0; 1830 } 1831 } else if (valid_lft) { 1832 clock_t expires = 0; 1833 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1834 if (addrconf_finite_timeout(rt_expires)) { 1835 /* not infinity */ 1836 flags |= RTF_EXPIRES; 1837 expires = jiffies_to_clock_t(rt_expires); 1838 } 1839 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1840 dev, expires, flags); 1841 } 1842 if (rt) 1843 dst_release(&rt->u.dst); 1844 } 1845 1846 /* Try to figure out our local address for this prefix */ 1847 1848 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1849 struct inet6_ifaddr * ifp; 1850 struct in6_addr addr; 1851 int create = 0, update_lft = 0; 1852 1853 if (pinfo->prefix_len == 64) { 1854 memcpy(&addr, &pinfo->prefix, 8); 1855 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1856 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1857 in6_dev_put(in6_dev); 1858 return; 1859 } 1860 goto ok; 1861 } 1862 if (net_ratelimit()) 1863 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1864 pinfo->prefix_len); 1865 in6_dev_put(in6_dev); 1866 return; 1867 1868 ok: 1869 1870 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1871 1872 if (ifp == NULL && valid_lft) { 1873 int max_addresses = in6_dev->cnf.max_addresses; 1874 u32 addr_flags = 0; 1875 1876 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1877 if (in6_dev->cnf.optimistic_dad && 1878 !net->ipv6.devconf_all->forwarding) 1879 addr_flags = IFA_F_OPTIMISTIC; 1880 #endif 1881 1882 /* Do not allow to create too much of autoconfigured 1883 * addresses; this would be too easy way to crash kernel. 1884 */ 1885 if (!max_addresses || 1886 ipv6_count_addresses(in6_dev) < max_addresses) 1887 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1888 addr_type&IPV6_ADDR_SCOPE_MASK, 1889 addr_flags); 1890 1891 if (!ifp || IS_ERR(ifp)) { 1892 in6_dev_put(in6_dev); 1893 return; 1894 } 1895 1896 update_lft = create = 1; 1897 ifp->cstamp = jiffies; 1898 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1899 } 1900 1901 if (ifp) { 1902 int flags; 1903 unsigned long now; 1904 #ifdef CONFIG_IPV6_PRIVACY 1905 struct inet6_ifaddr *ift; 1906 #endif 1907 u32 stored_lft; 1908 1909 /* update lifetime (RFC2462 5.5.3 e) */ 1910 spin_lock(&ifp->lock); 1911 now = jiffies; 1912 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1913 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1914 else 1915 stored_lft = 0; 1916 if (!update_lft && stored_lft) { 1917 if (valid_lft > MIN_VALID_LIFETIME || 1918 valid_lft > stored_lft) 1919 update_lft = 1; 1920 else if (stored_lft <= MIN_VALID_LIFETIME) { 1921 /* valid_lft <= stored_lft is always true */ 1922 /* 1923 * RFC 4862 Section 5.5.3e: 1924 * "Note that the preferred lifetime of 1925 * the corresponding address is always 1926 * reset to the Preferred Lifetime in 1927 * the received Prefix Information 1928 * option, regardless of whether the 1929 * valid lifetime is also reset or 1930 * ignored." 1931 * 1932 * So if the preferred lifetime in 1933 * this advertisement is different 1934 * than what we have stored, but the 1935 * valid lifetime is invalid, just 1936 * reset prefered_lft. 1937 * 1938 * We must set the valid lifetime 1939 * to the stored lifetime since we'll 1940 * be updating the timestamp below, 1941 * else we'll set it back to the 1942 * minumum. 1943 */ 1944 if (prefered_lft != ifp->prefered_lft) { 1945 valid_lft = stored_lft; 1946 update_lft = 1; 1947 } 1948 } else { 1949 valid_lft = MIN_VALID_LIFETIME; 1950 if (valid_lft < prefered_lft) 1951 prefered_lft = valid_lft; 1952 update_lft = 1; 1953 } 1954 } 1955 1956 if (update_lft) { 1957 ifp->valid_lft = valid_lft; 1958 ifp->prefered_lft = prefered_lft; 1959 ifp->tstamp = now; 1960 flags = ifp->flags; 1961 ifp->flags &= ~IFA_F_DEPRECATED; 1962 spin_unlock(&ifp->lock); 1963 1964 if (!(flags&IFA_F_TENTATIVE)) 1965 ipv6_ifa_notify(0, ifp); 1966 } else 1967 spin_unlock(&ifp->lock); 1968 1969 #ifdef CONFIG_IPV6_PRIVACY 1970 read_lock_bh(&in6_dev->lock); 1971 /* update all temporary addresses in the list */ 1972 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1973 /* 1974 * When adjusting the lifetimes of an existing 1975 * temporary address, only lower the lifetimes. 1976 * Implementations must not increase the 1977 * lifetimes of an existing temporary address 1978 * when processing a Prefix Information Option. 1979 */ 1980 if (ifp != ift->ifpub) 1981 continue; 1982 1983 spin_lock(&ift->lock); 1984 flags = ift->flags; 1985 if (ift->valid_lft > valid_lft && 1986 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1987 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1988 if (ift->prefered_lft > prefered_lft && 1989 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1990 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1991 spin_unlock(&ift->lock); 1992 if (!(flags&IFA_F_TENTATIVE)) 1993 ipv6_ifa_notify(0, ift); 1994 } 1995 1996 if (create && in6_dev->cnf.use_tempaddr > 0) { 1997 /* 1998 * When a new public address is created as described in [ADDRCONF], 1999 * also create a new temporary address. 2000 */ 2001 read_unlock_bh(&in6_dev->lock); 2002 ipv6_create_tempaddr(ifp, NULL); 2003 } else { 2004 read_unlock_bh(&in6_dev->lock); 2005 } 2006 #endif 2007 in6_ifa_put(ifp); 2008 addrconf_verify(0); 2009 } 2010 } 2011 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2012 in6_dev_put(in6_dev); 2013 } 2014 2015 /* 2016 * Set destination address. 2017 * Special case for SIT interfaces where we create a new "virtual" 2018 * device. 2019 */ 2020 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2021 { 2022 struct in6_ifreq ireq; 2023 struct net_device *dev; 2024 int err = -EINVAL; 2025 2026 rtnl_lock(); 2027 2028 err = -EFAULT; 2029 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2030 goto err_exit; 2031 2032 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2033 2034 err = -ENODEV; 2035 if (dev == NULL) 2036 goto err_exit; 2037 2038 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2039 if (dev->type == ARPHRD_SIT) { 2040 const struct net_device_ops *ops = dev->netdev_ops; 2041 struct ifreq ifr; 2042 struct ip_tunnel_parm p; 2043 2044 err = -EADDRNOTAVAIL; 2045 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2046 goto err_exit; 2047 2048 memset(&p, 0, sizeof(p)); 2049 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2050 p.iph.saddr = 0; 2051 p.iph.version = 4; 2052 p.iph.ihl = 5; 2053 p.iph.protocol = IPPROTO_IPV6; 2054 p.iph.ttl = 64; 2055 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2056 2057 if (ops->ndo_do_ioctl) { 2058 mm_segment_t oldfs = get_fs(); 2059 2060 set_fs(KERNEL_DS); 2061 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2062 set_fs(oldfs); 2063 } else 2064 err = -EOPNOTSUPP; 2065 2066 if (err == 0) { 2067 err = -ENOBUFS; 2068 dev = __dev_get_by_name(net, p.name); 2069 if (!dev) 2070 goto err_exit; 2071 err = dev_open(dev); 2072 } 2073 } 2074 #endif 2075 2076 err_exit: 2077 rtnl_unlock(); 2078 return err; 2079 } 2080 2081 /* 2082 * Manual configuration of address on an interface 2083 */ 2084 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2085 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2086 __u32 valid_lft) 2087 { 2088 struct inet6_ifaddr *ifp; 2089 struct inet6_dev *idev; 2090 struct net_device *dev; 2091 int scope; 2092 u32 flags; 2093 clock_t expires; 2094 unsigned long timeout; 2095 2096 ASSERT_RTNL(); 2097 2098 if (plen > 128) 2099 return -EINVAL; 2100 2101 /* check the lifetime */ 2102 if (!valid_lft || prefered_lft > valid_lft) 2103 return -EINVAL; 2104 2105 dev = __dev_get_by_index(net, ifindex); 2106 if (!dev) 2107 return -ENODEV; 2108 2109 if ((idev = addrconf_add_dev(dev)) == NULL) 2110 return -ENOBUFS; 2111 2112 scope = ipv6_addr_scope(pfx); 2113 2114 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2115 if (addrconf_finite_timeout(timeout)) { 2116 expires = jiffies_to_clock_t(timeout * HZ); 2117 valid_lft = timeout; 2118 flags = RTF_EXPIRES; 2119 } else { 2120 expires = 0; 2121 flags = 0; 2122 ifa_flags |= IFA_F_PERMANENT; 2123 } 2124 2125 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2126 if (addrconf_finite_timeout(timeout)) { 2127 if (timeout == 0) 2128 ifa_flags |= IFA_F_DEPRECATED; 2129 prefered_lft = timeout; 2130 } 2131 2132 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2133 2134 if (!IS_ERR(ifp)) { 2135 spin_lock_bh(&ifp->lock); 2136 ifp->valid_lft = valid_lft; 2137 ifp->prefered_lft = prefered_lft; 2138 ifp->tstamp = jiffies; 2139 spin_unlock_bh(&ifp->lock); 2140 2141 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2142 expires, flags); 2143 /* 2144 * Note that section 3.1 of RFC 4429 indicates 2145 * that the Optimistic flag should not be set for 2146 * manually configured addresses 2147 */ 2148 addrconf_dad_start(ifp, 0); 2149 in6_ifa_put(ifp); 2150 addrconf_verify(0); 2151 return 0; 2152 } 2153 2154 return PTR_ERR(ifp); 2155 } 2156 2157 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2158 unsigned int plen) 2159 { 2160 struct inet6_ifaddr *ifp; 2161 struct inet6_dev *idev; 2162 struct net_device *dev; 2163 2164 if (plen > 128) 2165 return -EINVAL; 2166 2167 dev = __dev_get_by_index(net, ifindex); 2168 if (!dev) 2169 return -ENODEV; 2170 2171 if ((idev = __in6_dev_get(dev)) == NULL) 2172 return -ENXIO; 2173 2174 read_lock_bh(&idev->lock); 2175 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2176 if (ifp->prefix_len == plen && 2177 ipv6_addr_equal(pfx, &ifp->addr)) { 2178 in6_ifa_hold(ifp); 2179 read_unlock_bh(&idev->lock); 2180 2181 ipv6_del_addr(ifp); 2182 2183 /* If the last address is deleted administratively, 2184 disable IPv6 on this interface. 2185 */ 2186 if (idev->addr_list == NULL) 2187 addrconf_ifdown(idev->dev, 1); 2188 return 0; 2189 } 2190 } 2191 read_unlock_bh(&idev->lock); 2192 return -EADDRNOTAVAIL; 2193 } 2194 2195 2196 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2197 { 2198 struct in6_ifreq ireq; 2199 int err; 2200 2201 if (!capable(CAP_NET_ADMIN)) 2202 return -EPERM; 2203 2204 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2205 return -EFAULT; 2206 2207 rtnl_lock(); 2208 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2209 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2210 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2211 rtnl_unlock(); 2212 return err; 2213 } 2214 2215 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2216 { 2217 struct in6_ifreq ireq; 2218 int err; 2219 2220 if (!capable(CAP_NET_ADMIN)) 2221 return -EPERM; 2222 2223 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2224 return -EFAULT; 2225 2226 rtnl_lock(); 2227 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2228 ireq.ifr6_prefixlen); 2229 rtnl_unlock(); 2230 return err; 2231 } 2232 2233 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2234 int plen, int scope) 2235 { 2236 struct inet6_ifaddr *ifp; 2237 2238 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2239 if (!IS_ERR(ifp)) { 2240 spin_lock_bh(&ifp->lock); 2241 ifp->flags &= ~IFA_F_TENTATIVE; 2242 spin_unlock_bh(&ifp->lock); 2243 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2244 in6_ifa_put(ifp); 2245 } 2246 } 2247 2248 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2249 static void sit_add_v4_addrs(struct inet6_dev *idev) 2250 { 2251 struct in6_addr addr; 2252 struct net_device *dev; 2253 struct net *net = dev_net(idev->dev); 2254 int scope; 2255 2256 ASSERT_RTNL(); 2257 2258 memset(&addr, 0, sizeof(struct in6_addr)); 2259 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2260 2261 if (idev->dev->flags&IFF_POINTOPOINT) { 2262 addr.s6_addr32[0] = htonl(0xfe800000); 2263 scope = IFA_LINK; 2264 } else { 2265 scope = IPV6_ADDR_COMPATv4; 2266 } 2267 2268 if (addr.s6_addr32[3]) { 2269 add_addr(idev, &addr, 128, scope); 2270 return; 2271 } 2272 2273 for_each_netdev(net, dev) { 2274 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2275 if (in_dev && (dev->flags & IFF_UP)) { 2276 struct in_ifaddr * ifa; 2277 2278 int flag = scope; 2279 2280 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2281 int plen; 2282 2283 addr.s6_addr32[3] = ifa->ifa_local; 2284 2285 if (ifa->ifa_scope == RT_SCOPE_LINK) 2286 continue; 2287 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2288 if (idev->dev->flags&IFF_POINTOPOINT) 2289 continue; 2290 flag |= IFA_HOST; 2291 } 2292 if (idev->dev->flags&IFF_POINTOPOINT) 2293 plen = 64; 2294 else 2295 plen = 96; 2296 2297 add_addr(idev, &addr, plen, flag); 2298 } 2299 } 2300 } 2301 } 2302 #endif 2303 2304 static void init_loopback(struct net_device *dev) 2305 { 2306 struct inet6_dev *idev; 2307 2308 /* ::1 */ 2309 2310 ASSERT_RTNL(); 2311 2312 if ((idev = ipv6_find_idev(dev)) == NULL) { 2313 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2314 return; 2315 } 2316 2317 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2318 } 2319 2320 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2321 { 2322 struct inet6_ifaddr * ifp; 2323 u32 addr_flags = IFA_F_PERMANENT; 2324 2325 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2326 if (idev->cnf.optimistic_dad && 2327 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2328 addr_flags |= IFA_F_OPTIMISTIC; 2329 #endif 2330 2331 2332 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2333 if (!IS_ERR(ifp)) { 2334 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2335 addrconf_dad_start(ifp, 0); 2336 in6_ifa_put(ifp); 2337 } 2338 } 2339 2340 static void addrconf_dev_config(struct net_device *dev) 2341 { 2342 struct in6_addr addr; 2343 struct inet6_dev * idev; 2344 2345 ASSERT_RTNL(); 2346 2347 if ((dev->type != ARPHRD_ETHER) && 2348 (dev->type != ARPHRD_FDDI) && 2349 (dev->type != ARPHRD_IEEE802_TR) && 2350 (dev->type != ARPHRD_ARCNET) && 2351 (dev->type != ARPHRD_INFINIBAND)) { 2352 /* Alas, we support only Ethernet autoconfiguration. */ 2353 return; 2354 } 2355 2356 idev = addrconf_add_dev(dev); 2357 if (idev == NULL) 2358 return; 2359 2360 memset(&addr, 0, sizeof(struct in6_addr)); 2361 addr.s6_addr32[0] = htonl(0xFE800000); 2362 2363 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2364 addrconf_add_linklocal(idev, &addr); 2365 } 2366 2367 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2368 static void addrconf_sit_config(struct net_device *dev) 2369 { 2370 struct inet6_dev *idev; 2371 2372 ASSERT_RTNL(); 2373 2374 /* 2375 * Configure the tunnel with one of our IPv4 2376 * addresses... we should configure all of 2377 * our v4 addrs in the tunnel 2378 */ 2379 2380 if ((idev = ipv6_find_idev(dev)) == NULL) { 2381 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2382 return; 2383 } 2384 2385 if (dev->priv_flags & IFF_ISATAP) { 2386 struct in6_addr addr; 2387 2388 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2389 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2390 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2391 addrconf_add_linklocal(idev, &addr); 2392 return; 2393 } 2394 2395 sit_add_v4_addrs(idev); 2396 2397 if (dev->flags&IFF_POINTOPOINT) { 2398 addrconf_add_mroute(dev); 2399 addrconf_add_lroute(dev); 2400 } else 2401 sit_route_add(dev); 2402 } 2403 #endif 2404 2405 static inline int 2406 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2407 { 2408 struct in6_addr lladdr; 2409 2410 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2411 addrconf_add_linklocal(idev, &lladdr); 2412 return 0; 2413 } 2414 return -1; 2415 } 2416 2417 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2418 { 2419 struct net_device *link_dev; 2420 struct net *net = dev_net(idev->dev); 2421 2422 /* first try to inherit the link-local address from the link device */ 2423 if (idev->dev->iflink && 2424 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2425 if (!ipv6_inherit_linklocal(idev, link_dev)) 2426 return; 2427 } 2428 /* then try to inherit it from any device */ 2429 for_each_netdev(net, link_dev) { 2430 if (!ipv6_inherit_linklocal(idev, link_dev)) 2431 return; 2432 } 2433 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2434 } 2435 2436 /* 2437 * Autoconfigure tunnel with a link-local address so routing protocols, 2438 * DHCPv6, MLD etc. can be run over the virtual link 2439 */ 2440 2441 static void addrconf_ip6_tnl_config(struct net_device *dev) 2442 { 2443 struct inet6_dev *idev; 2444 2445 ASSERT_RTNL(); 2446 2447 if ((idev = addrconf_add_dev(dev)) == NULL) { 2448 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2449 return; 2450 } 2451 ip6_tnl_add_linklocal(idev); 2452 } 2453 2454 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2455 void * data) 2456 { 2457 struct net_device *dev = (struct net_device *) data; 2458 struct inet6_dev *idev = __in6_dev_get(dev); 2459 int run_pending = 0; 2460 int err; 2461 2462 switch(event) { 2463 case NETDEV_REGISTER: 2464 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2465 idev = ipv6_add_dev(dev); 2466 if (!idev) 2467 return notifier_from_errno(-ENOMEM); 2468 } 2469 break; 2470 case NETDEV_UP: 2471 case NETDEV_CHANGE: 2472 if (dev->flags & IFF_SLAVE) 2473 break; 2474 2475 if (event == NETDEV_UP) { 2476 if (!addrconf_qdisc_ok(dev)) { 2477 /* device is not ready yet. */ 2478 printk(KERN_INFO 2479 "ADDRCONF(NETDEV_UP): %s: " 2480 "link is not ready\n", 2481 dev->name); 2482 break; 2483 } 2484 2485 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2486 idev = ipv6_add_dev(dev); 2487 2488 if (idev) { 2489 idev->if_flags |= IF_READY; 2490 run_pending = 1; 2491 } 2492 } else { 2493 if (!addrconf_qdisc_ok(dev)) { 2494 /* device is still not ready. */ 2495 break; 2496 } 2497 2498 if (idev) { 2499 if (idev->if_flags & IF_READY) { 2500 /* device is already configured. */ 2501 break; 2502 } 2503 idev->if_flags |= IF_READY; 2504 } 2505 2506 printk(KERN_INFO 2507 "ADDRCONF(NETDEV_CHANGE): %s: " 2508 "link becomes ready\n", 2509 dev->name); 2510 2511 run_pending = 1; 2512 } 2513 2514 switch(dev->type) { 2515 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2516 case ARPHRD_SIT: 2517 addrconf_sit_config(dev); 2518 break; 2519 #endif 2520 case ARPHRD_TUNNEL6: 2521 addrconf_ip6_tnl_config(dev); 2522 break; 2523 case ARPHRD_LOOPBACK: 2524 init_loopback(dev); 2525 break; 2526 2527 default: 2528 addrconf_dev_config(dev); 2529 break; 2530 } 2531 if (idev) { 2532 if (run_pending) 2533 addrconf_dad_run(idev); 2534 2535 /* If the MTU changed during the interface down, when the 2536 interface up, the changed MTU must be reflected in the 2537 idev as well as routers. 2538 */ 2539 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2540 rt6_mtu_change(dev, dev->mtu); 2541 idev->cnf.mtu6 = dev->mtu; 2542 } 2543 idev->tstamp = jiffies; 2544 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2545 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2546 stop IPv6 on this interface. 2547 */ 2548 if (dev->mtu < IPV6_MIN_MTU) 2549 addrconf_ifdown(dev, event != NETDEV_DOWN); 2550 } 2551 break; 2552 2553 case NETDEV_CHANGEMTU: 2554 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2555 rt6_mtu_change(dev, dev->mtu); 2556 idev->cnf.mtu6 = dev->mtu; 2557 break; 2558 } 2559 2560 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2561 idev = ipv6_add_dev(dev); 2562 if (idev) 2563 break; 2564 } 2565 2566 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2567 2568 case NETDEV_DOWN: 2569 case NETDEV_UNREGISTER: 2570 /* 2571 * Remove all addresses from this interface. 2572 */ 2573 addrconf_ifdown(dev, event != NETDEV_DOWN); 2574 break; 2575 2576 case NETDEV_CHANGENAME: 2577 if (idev) { 2578 snmp6_unregister_dev(idev); 2579 addrconf_sysctl_unregister(idev); 2580 addrconf_sysctl_register(idev); 2581 err = snmp6_register_dev(idev); 2582 if (err) 2583 return notifier_from_errno(err); 2584 } 2585 break; 2586 case NETDEV_BONDING_OLDTYPE: 2587 case NETDEV_BONDING_NEWTYPE: 2588 addrconf_bonding_change(dev, event); 2589 break; 2590 } 2591 2592 return NOTIFY_OK; 2593 } 2594 2595 /* 2596 * addrconf module should be notified of a device going up 2597 */ 2598 static struct notifier_block ipv6_dev_notf = { 2599 .notifier_call = addrconf_notify, 2600 .priority = 0 2601 }; 2602 2603 static void addrconf_bonding_change(struct net_device *dev, unsigned long event) 2604 { 2605 struct inet6_dev *idev; 2606 ASSERT_RTNL(); 2607 2608 idev = __in6_dev_get(dev); 2609 2610 if (event == NETDEV_BONDING_NEWTYPE) 2611 ipv6_mc_remap(idev); 2612 else if (event == NETDEV_BONDING_OLDTYPE) 2613 ipv6_mc_unmap(idev); 2614 } 2615 2616 static int addrconf_ifdown(struct net_device *dev, int how) 2617 { 2618 struct inet6_dev *idev; 2619 struct inet6_ifaddr *ifa, **bifa; 2620 struct net *net = dev_net(dev); 2621 int i; 2622 2623 ASSERT_RTNL(); 2624 2625 rt6_ifdown(net, dev); 2626 neigh_ifdown(&nd_tbl, dev); 2627 2628 idev = __in6_dev_get(dev); 2629 if (idev == NULL) 2630 return -ENODEV; 2631 2632 /* Step 1: remove reference to ipv6 device from parent device. 2633 Do not dev_put! 2634 */ 2635 if (how) { 2636 idev->dead = 1; 2637 2638 /* protected by rtnl_lock */ 2639 rcu_assign_pointer(dev->ip6_ptr, NULL); 2640 2641 /* Step 1.5: remove snmp6 entry */ 2642 snmp6_unregister_dev(idev); 2643 2644 } 2645 2646 /* Step 2: clear hash table */ 2647 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2648 bifa = &inet6_addr_lst[i]; 2649 2650 write_lock_bh(&addrconf_hash_lock); 2651 while ((ifa = *bifa) != NULL) { 2652 if (ifa->idev == idev) { 2653 *bifa = ifa->lst_next; 2654 ifa->lst_next = NULL; 2655 addrconf_del_timer(ifa); 2656 in6_ifa_put(ifa); 2657 continue; 2658 } 2659 bifa = &ifa->lst_next; 2660 } 2661 write_unlock_bh(&addrconf_hash_lock); 2662 } 2663 2664 write_lock_bh(&idev->lock); 2665 2666 /* Step 3: clear flags for stateless addrconf */ 2667 if (!how) 2668 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2669 2670 /* Step 4: clear address list */ 2671 #ifdef CONFIG_IPV6_PRIVACY 2672 if (how && del_timer(&idev->regen_timer)) 2673 in6_dev_put(idev); 2674 2675 /* clear tempaddr list */ 2676 while ((ifa = idev->tempaddr_list) != NULL) { 2677 idev->tempaddr_list = ifa->tmp_next; 2678 ifa->tmp_next = NULL; 2679 ifa->dead = 1; 2680 write_unlock_bh(&idev->lock); 2681 spin_lock_bh(&ifa->lock); 2682 2683 if (ifa->ifpub) { 2684 in6_ifa_put(ifa->ifpub); 2685 ifa->ifpub = NULL; 2686 } 2687 spin_unlock_bh(&ifa->lock); 2688 in6_ifa_put(ifa); 2689 write_lock_bh(&idev->lock); 2690 } 2691 #endif 2692 while ((ifa = idev->addr_list) != NULL) { 2693 idev->addr_list = ifa->if_next; 2694 ifa->if_next = NULL; 2695 ifa->dead = 1; 2696 addrconf_del_timer(ifa); 2697 write_unlock_bh(&idev->lock); 2698 2699 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2700 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2701 in6_ifa_put(ifa); 2702 2703 write_lock_bh(&idev->lock); 2704 } 2705 write_unlock_bh(&idev->lock); 2706 2707 /* Step 5: Discard multicast list */ 2708 2709 if (how) 2710 ipv6_mc_destroy_dev(idev); 2711 else 2712 ipv6_mc_down(idev); 2713 2714 idev->tstamp = jiffies; 2715 2716 /* Shot the device (if unregistered) */ 2717 2718 if (how) { 2719 addrconf_sysctl_unregister(idev); 2720 neigh_parms_release(&nd_tbl, idev->nd_parms); 2721 neigh_ifdown(&nd_tbl, dev); 2722 in6_dev_put(idev); 2723 } 2724 return 0; 2725 } 2726 2727 static void addrconf_rs_timer(unsigned long data) 2728 { 2729 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2730 2731 if (ifp->idev->cnf.forwarding) 2732 goto out; 2733 2734 if (ifp->idev->if_flags & IF_RA_RCVD) { 2735 /* 2736 * Announcement received after solicitation 2737 * was sent 2738 */ 2739 goto out; 2740 } 2741 2742 spin_lock(&ifp->lock); 2743 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2744 /* The wait after the last probe can be shorter */ 2745 addrconf_mod_timer(ifp, AC_RS, 2746 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2747 ifp->idev->cnf.rtr_solicit_delay : 2748 ifp->idev->cnf.rtr_solicit_interval); 2749 spin_unlock(&ifp->lock); 2750 2751 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2752 } else { 2753 spin_unlock(&ifp->lock); 2754 /* 2755 * Note: we do not support deprecated "all on-link" 2756 * assumption any longer. 2757 */ 2758 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2759 ifp->idev->dev->name); 2760 } 2761 2762 out: 2763 in6_ifa_put(ifp); 2764 } 2765 2766 /* 2767 * Duplicate Address Detection 2768 */ 2769 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2770 { 2771 unsigned long rand_num; 2772 struct inet6_dev *idev = ifp->idev; 2773 2774 if (ifp->flags & IFA_F_OPTIMISTIC) 2775 rand_num = 0; 2776 else 2777 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2778 2779 ifp->probes = idev->cnf.dad_transmits; 2780 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2781 } 2782 2783 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2784 { 2785 struct inet6_dev *idev = ifp->idev; 2786 struct net_device *dev = idev->dev; 2787 2788 addrconf_join_solict(dev, &ifp->addr); 2789 2790 net_srandom(ifp->addr.s6_addr32[3]); 2791 2792 read_lock_bh(&idev->lock); 2793 if (ifp->dead) 2794 goto out; 2795 spin_lock_bh(&ifp->lock); 2796 2797 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2798 idev->cnf.accept_dad < 1 || 2799 !(ifp->flags&IFA_F_TENTATIVE) || 2800 ifp->flags & IFA_F_NODAD) { 2801 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2802 spin_unlock_bh(&ifp->lock); 2803 read_unlock_bh(&idev->lock); 2804 2805 addrconf_dad_completed(ifp); 2806 return; 2807 } 2808 2809 if (!(idev->if_flags & IF_READY)) { 2810 spin_unlock_bh(&ifp->lock); 2811 read_unlock_bh(&idev->lock); 2812 /* 2813 * If the device is not ready: 2814 * - keep it tentative if it is a permanent address. 2815 * - otherwise, kill it. 2816 */ 2817 in6_ifa_hold(ifp); 2818 addrconf_dad_stop(ifp, 0); 2819 return; 2820 } 2821 2822 /* 2823 * Optimistic nodes can start receiving 2824 * Frames right away 2825 */ 2826 if(ifp->flags & IFA_F_OPTIMISTIC) 2827 ip6_ins_rt(ifp->rt); 2828 2829 addrconf_dad_kick(ifp); 2830 spin_unlock_bh(&ifp->lock); 2831 out: 2832 read_unlock_bh(&idev->lock); 2833 } 2834 2835 static void addrconf_dad_timer(unsigned long data) 2836 { 2837 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2838 struct inet6_dev *idev = ifp->idev; 2839 struct in6_addr mcaddr; 2840 2841 read_lock_bh(&idev->lock); 2842 if (idev->dead) { 2843 read_unlock_bh(&idev->lock); 2844 goto out; 2845 } 2846 spin_lock_bh(&ifp->lock); 2847 if (ifp->probes == 0) { 2848 /* 2849 * DAD was successful 2850 */ 2851 2852 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2853 spin_unlock_bh(&ifp->lock); 2854 read_unlock_bh(&idev->lock); 2855 2856 addrconf_dad_completed(ifp); 2857 2858 goto out; 2859 } 2860 2861 ifp->probes--; 2862 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2863 spin_unlock_bh(&ifp->lock); 2864 read_unlock_bh(&idev->lock); 2865 2866 /* send a neighbour solicitation for our addr */ 2867 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2868 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2869 out: 2870 in6_ifa_put(ifp); 2871 } 2872 2873 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2874 { 2875 struct net_device * dev = ifp->idev->dev; 2876 2877 /* 2878 * Configure the address for reception. Now it is valid. 2879 */ 2880 2881 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2882 2883 /* If added prefix is link local and forwarding is off, 2884 start sending router solicitations. 2885 */ 2886 2887 if (ifp->idev->cnf.forwarding == 0 && 2888 ifp->idev->cnf.rtr_solicits > 0 && 2889 (dev->flags&IFF_LOOPBACK) == 0 && 2890 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2891 /* 2892 * If a host as already performed a random delay 2893 * [...] as part of DAD [...] there is no need 2894 * to delay again before sending the first RS 2895 */ 2896 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2897 2898 spin_lock_bh(&ifp->lock); 2899 ifp->probes = 1; 2900 ifp->idev->if_flags |= IF_RS_SENT; 2901 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2902 spin_unlock_bh(&ifp->lock); 2903 } 2904 } 2905 2906 static void addrconf_dad_run(struct inet6_dev *idev) { 2907 struct inet6_ifaddr *ifp; 2908 2909 read_lock_bh(&idev->lock); 2910 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2911 spin_lock_bh(&ifp->lock); 2912 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2913 spin_unlock_bh(&ifp->lock); 2914 continue; 2915 } 2916 spin_unlock_bh(&ifp->lock); 2917 addrconf_dad_kick(ifp); 2918 } 2919 read_unlock_bh(&idev->lock); 2920 } 2921 2922 #ifdef CONFIG_PROC_FS 2923 struct if6_iter_state { 2924 struct seq_net_private p; 2925 int bucket; 2926 }; 2927 2928 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2929 { 2930 struct inet6_ifaddr *ifa = NULL; 2931 struct if6_iter_state *state = seq->private; 2932 struct net *net = seq_file_net(seq); 2933 2934 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2935 ifa = inet6_addr_lst[state->bucket]; 2936 2937 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2938 ifa = ifa->lst_next; 2939 if (ifa) 2940 break; 2941 } 2942 return ifa; 2943 } 2944 2945 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2946 { 2947 struct if6_iter_state *state = seq->private; 2948 struct net *net = seq_file_net(seq); 2949 2950 ifa = ifa->lst_next; 2951 try_again: 2952 if (ifa) { 2953 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2954 ifa = ifa->lst_next; 2955 goto try_again; 2956 } 2957 } 2958 2959 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2960 ifa = inet6_addr_lst[state->bucket]; 2961 goto try_again; 2962 } 2963 2964 return ifa; 2965 } 2966 2967 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2968 { 2969 struct inet6_ifaddr *ifa = if6_get_first(seq); 2970 2971 if (ifa) 2972 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2973 --pos; 2974 return pos ? NULL : ifa; 2975 } 2976 2977 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2978 __acquires(addrconf_hash_lock) 2979 { 2980 read_lock_bh(&addrconf_hash_lock); 2981 return if6_get_idx(seq, *pos); 2982 } 2983 2984 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2985 { 2986 struct inet6_ifaddr *ifa; 2987 2988 ifa = if6_get_next(seq, v); 2989 ++*pos; 2990 return ifa; 2991 } 2992 2993 static void if6_seq_stop(struct seq_file *seq, void *v) 2994 __releases(addrconf_hash_lock) 2995 { 2996 read_unlock_bh(&addrconf_hash_lock); 2997 } 2998 2999 static int if6_seq_show(struct seq_file *seq, void *v) 3000 { 3001 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3002 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3003 &ifp->addr, 3004 ifp->idev->dev->ifindex, 3005 ifp->prefix_len, 3006 ifp->scope, 3007 ifp->flags, 3008 ifp->idev->dev->name); 3009 return 0; 3010 } 3011 3012 static const struct seq_operations if6_seq_ops = { 3013 .start = if6_seq_start, 3014 .next = if6_seq_next, 3015 .show = if6_seq_show, 3016 .stop = if6_seq_stop, 3017 }; 3018 3019 static int if6_seq_open(struct inode *inode, struct file *file) 3020 { 3021 return seq_open_net(inode, file, &if6_seq_ops, 3022 sizeof(struct if6_iter_state)); 3023 } 3024 3025 static const struct file_operations if6_fops = { 3026 .owner = THIS_MODULE, 3027 .open = if6_seq_open, 3028 .read = seq_read, 3029 .llseek = seq_lseek, 3030 .release = seq_release_net, 3031 }; 3032 3033 static int if6_proc_net_init(struct net *net) 3034 { 3035 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3036 return -ENOMEM; 3037 return 0; 3038 } 3039 3040 static void if6_proc_net_exit(struct net *net) 3041 { 3042 proc_net_remove(net, "if_inet6"); 3043 } 3044 3045 static struct pernet_operations if6_proc_net_ops = { 3046 .init = if6_proc_net_init, 3047 .exit = if6_proc_net_exit, 3048 }; 3049 3050 int __init if6_proc_init(void) 3051 { 3052 return register_pernet_subsys(&if6_proc_net_ops); 3053 } 3054 3055 void if6_proc_exit(void) 3056 { 3057 unregister_pernet_subsys(&if6_proc_net_ops); 3058 } 3059 #endif /* CONFIG_PROC_FS */ 3060 3061 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3062 /* Check if address is a home address configured on any interface. */ 3063 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3064 { 3065 int ret = 0; 3066 struct inet6_ifaddr * ifp; 3067 u8 hash = ipv6_addr_hash(addr); 3068 read_lock_bh(&addrconf_hash_lock); 3069 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 3070 if (!net_eq(dev_net(ifp->idev->dev), net)) 3071 continue; 3072 if (ipv6_addr_equal(&ifp->addr, addr) && 3073 (ifp->flags & IFA_F_HOMEADDRESS)) { 3074 ret = 1; 3075 break; 3076 } 3077 } 3078 read_unlock_bh(&addrconf_hash_lock); 3079 return ret; 3080 } 3081 #endif 3082 3083 /* 3084 * Periodic address status verification 3085 */ 3086 3087 static void addrconf_verify(unsigned long foo) 3088 { 3089 struct inet6_ifaddr *ifp; 3090 unsigned long now, next; 3091 int i; 3092 3093 spin_lock_bh(&addrconf_verify_lock); 3094 now = jiffies; 3095 next = now + ADDR_CHECK_FREQUENCY; 3096 3097 del_timer(&addr_chk_timer); 3098 3099 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3100 3101 restart: 3102 read_lock(&addrconf_hash_lock); 3103 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3104 unsigned long age; 3105 #ifdef CONFIG_IPV6_PRIVACY 3106 unsigned long regen_advance; 3107 #endif 3108 3109 if (ifp->flags & IFA_F_PERMANENT) 3110 continue; 3111 3112 spin_lock(&ifp->lock); 3113 age = (now - ifp->tstamp) / HZ; 3114 3115 #ifdef CONFIG_IPV6_PRIVACY 3116 regen_advance = ifp->idev->cnf.regen_max_retry * 3117 ifp->idev->cnf.dad_transmits * 3118 ifp->idev->nd_parms->retrans_time / HZ; 3119 #endif 3120 3121 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3122 age >= ifp->valid_lft) { 3123 spin_unlock(&ifp->lock); 3124 in6_ifa_hold(ifp); 3125 read_unlock(&addrconf_hash_lock); 3126 ipv6_del_addr(ifp); 3127 goto restart; 3128 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3129 spin_unlock(&ifp->lock); 3130 continue; 3131 } else if (age >= ifp->prefered_lft) { 3132 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3133 int deprecate = 0; 3134 3135 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3136 deprecate = 1; 3137 ifp->flags |= IFA_F_DEPRECATED; 3138 } 3139 3140 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3141 next = ifp->tstamp + ifp->valid_lft * HZ; 3142 3143 spin_unlock(&ifp->lock); 3144 3145 if (deprecate) { 3146 in6_ifa_hold(ifp); 3147 read_unlock(&addrconf_hash_lock); 3148 3149 ipv6_ifa_notify(0, ifp); 3150 in6_ifa_put(ifp); 3151 goto restart; 3152 } 3153 #ifdef CONFIG_IPV6_PRIVACY 3154 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3155 !(ifp->flags&IFA_F_TENTATIVE)) { 3156 if (age >= ifp->prefered_lft - regen_advance) { 3157 struct inet6_ifaddr *ifpub = ifp->ifpub; 3158 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3159 next = ifp->tstamp + ifp->prefered_lft * HZ; 3160 if (!ifp->regen_count && ifpub) { 3161 ifp->regen_count++; 3162 in6_ifa_hold(ifp); 3163 in6_ifa_hold(ifpub); 3164 spin_unlock(&ifp->lock); 3165 read_unlock(&addrconf_hash_lock); 3166 spin_lock(&ifpub->lock); 3167 ifpub->regen_count = 0; 3168 spin_unlock(&ifpub->lock); 3169 ipv6_create_tempaddr(ifpub, ifp); 3170 in6_ifa_put(ifpub); 3171 in6_ifa_put(ifp); 3172 goto restart; 3173 } 3174 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3175 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3176 spin_unlock(&ifp->lock); 3177 #endif 3178 } else { 3179 /* ifp->prefered_lft <= ifp->valid_lft */ 3180 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3181 next = ifp->tstamp + ifp->prefered_lft * HZ; 3182 spin_unlock(&ifp->lock); 3183 } 3184 } 3185 read_unlock(&addrconf_hash_lock); 3186 } 3187 3188 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3189 add_timer(&addr_chk_timer); 3190 spin_unlock_bh(&addrconf_verify_lock); 3191 } 3192 3193 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3194 { 3195 struct in6_addr *pfx = NULL; 3196 3197 if (addr) 3198 pfx = nla_data(addr); 3199 3200 if (local) { 3201 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3202 pfx = NULL; 3203 else 3204 pfx = nla_data(local); 3205 } 3206 3207 return pfx; 3208 } 3209 3210 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3211 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3212 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3213 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3214 }; 3215 3216 static int 3217 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3218 { 3219 struct net *net = sock_net(skb->sk); 3220 struct ifaddrmsg *ifm; 3221 struct nlattr *tb[IFA_MAX+1]; 3222 struct in6_addr *pfx; 3223 int err; 3224 3225 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3226 if (err < 0) 3227 return err; 3228 3229 ifm = nlmsg_data(nlh); 3230 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3231 if (pfx == NULL) 3232 return -EINVAL; 3233 3234 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3235 } 3236 3237 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3238 u32 prefered_lft, u32 valid_lft) 3239 { 3240 u32 flags; 3241 clock_t expires; 3242 unsigned long timeout; 3243 3244 if (!valid_lft || (prefered_lft > valid_lft)) 3245 return -EINVAL; 3246 3247 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3248 if (addrconf_finite_timeout(timeout)) { 3249 expires = jiffies_to_clock_t(timeout * HZ); 3250 valid_lft = timeout; 3251 flags = RTF_EXPIRES; 3252 } else { 3253 expires = 0; 3254 flags = 0; 3255 ifa_flags |= IFA_F_PERMANENT; 3256 } 3257 3258 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3259 if (addrconf_finite_timeout(timeout)) { 3260 if (timeout == 0) 3261 ifa_flags |= IFA_F_DEPRECATED; 3262 prefered_lft = timeout; 3263 } 3264 3265 spin_lock_bh(&ifp->lock); 3266 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3267 ifp->tstamp = jiffies; 3268 ifp->valid_lft = valid_lft; 3269 ifp->prefered_lft = prefered_lft; 3270 3271 spin_unlock_bh(&ifp->lock); 3272 if (!(ifp->flags&IFA_F_TENTATIVE)) 3273 ipv6_ifa_notify(0, ifp); 3274 3275 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3276 expires, flags); 3277 addrconf_verify(0); 3278 3279 return 0; 3280 } 3281 3282 static int 3283 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3284 { 3285 struct net *net = sock_net(skb->sk); 3286 struct ifaddrmsg *ifm; 3287 struct nlattr *tb[IFA_MAX+1]; 3288 struct in6_addr *pfx; 3289 struct inet6_ifaddr *ifa; 3290 struct net_device *dev; 3291 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3292 u8 ifa_flags; 3293 int err; 3294 3295 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3296 if (err < 0) 3297 return err; 3298 3299 ifm = nlmsg_data(nlh); 3300 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3301 if (pfx == NULL) 3302 return -EINVAL; 3303 3304 if (tb[IFA_CACHEINFO]) { 3305 struct ifa_cacheinfo *ci; 3306 3307 ci = nla_data(tb[IFA_CACHEINFO]); 3308 valid_lft = ci->ifa_valid; 3309 preferred_lft = ci->ifa_prefered; 3310 } else { 3311 preferred_lft = INFINITY_LIFE_TIME; 3312 valid_lft = INFINITY_LIFE_TIME; 3313 } 3314 3315 dev = __dev_get_by_index(net, ifm->ifa_index); 3316 if (dev == NULL) 3317 return -ENODEV; 3318 3319 /* We ignore other flags so far. */ 3320 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3321 3322 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3323 if (ifa == NULL) { 3324 /* 3325 * It would be best to check for !NLM_F_CREATE here but 3326 * userspace alreay relies on not having to provide this. 3327 */ 3328 return inet6_addr_add(net, ifm->ifa_index, pfx, 3329 ifm->ifa_prefixlen, ifa_flags, 3330 preferred_lft, valid_lft); 3331 } 3332 3333 if (nlh->nlmsg_flags & NLM_F_EXCL || 3334 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3335 err = -EEXIST; 3336 else 3337 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3338 3339 in6_ifa_put(ifa); 3340 3341 return err; 3342 } 3343 3344 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3345 u8 scope, int ifindex) 3346 { 3347 struct ifaddrmsg *ifm; 3348 3349 ifm = nlmsg_data(nlh); 3350 ifm->ifa_family = AF_INET6; 3351 ifm->ifa_prefixlen = prefixlen; 3352 ifm->ifa_flags = flags; 3353 ifm->ifa_scope = scope; 3354 ifm->ifa_index = ifindex; 3355 } 3356 3357 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3358 unsigned long tstamp, u32 preferred, u32 valid) 3359 { 3360 struct ifa_cacheinfo ci; 3361 3362 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3363 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3364 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3365 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3366 ci.ifa_prefered = preferred; 3367 ci.ifa_valid = valid; 3368 3369 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3370 } 3371 3372 static inline int rt_scope(int ifa_scope) 3373 { 3374 if (ifa_scope & IFA_HOST) 3375 return RT_SCOPE_HOST; 3376 else if (ifa_scope & IFA_LINK) 3377 return RT_SCOPE_LINK; 3378 else if (ifa_scope & IFA_SITE) 3379 return RT_SCOPE_SITE; 3380 else 3381 return RT_SCOPE_UNIVERSE; 3382 } 3383 3384 static inline int inet6_ifaddr_msgsize(void) 3385 { 3386 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3387 + nla_total_size(16) /* IFA_ADDRESS */ 3388 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3389 } 3390 3391 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3392 u32 pid, u32 seq, int event, unsigned int flags) 3393 { 3394 struct nlmsghdr *nlh; 3395 u32 preferred, valid; 3396 3397 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3398 if (nlh == NULL) 3399 return -EMSGSIZE; 3400 3401 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3402 ifa->idev->dev->ifindex); 3403 3404 if (!(ifa->flags&IFA_F_PERMANENT)) { 3405 preferred = ifa->prefered_lft; 3406 valid = ifa->valid_lft; 3407 if (preferred != INFINITY_LIFE_TIME) { 3408 long tval = (jiffies - ifa->tstamp)/HZ; 3409 if (preferred > tval) 3410 preferred -= tval; 3411 else 3412 preferred = 0; 3413 if (valid != INFINITY_LIFE_TIME) 3414 valid -= tval; 3415 } 3416 } else { 3417 preferred = INFINITY_LIFE_TIME; 3418 valid = INFINITY_LIFE_TIME; 3419 } 3420 3421 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3422 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3423 nlmsg_cancel(skb, nlh); 3424 return -EMSGSIZE; 3425 } 3426 3427 return nlmsg_end(skb, nlh); 3428 } 3429 3430 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3431 u32 pid, u32 seq, int event, u16 flags) 3432 { 3433 struct nlmsghdr *nlh; 3434 u8 scope = RT_SCOPE_UNIVERSE; 3435 int ifindex = ifmca->idev->dev->ifindex; 3436 3437 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3438 scope = RT_SCOPE_SITE; 3439 3440 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3441 if (nlh == NULL) 3442 return -EMSGSIZE; 3443 3444 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3445 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3446 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3447 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3448 nlmsg_cancel(skb, nlh); 3449 return -EMSGSIZE; 3450 } 3451 3452 return nlmsg_end(skb, nlh); 3453 } 3454 3455 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3456 u32 pid, u32 seq, int event, unsigned int flags) 3457 { 3458 struct nlmsghdr *nlh; 3459 u8 scope = RT_SCOPE_UNIVERSE; 3460 int ifindex = ifaca->aca_idev->dev->ifindex; 3461 3462 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3463 scope = RT_SCOPE_SITE; 3464 3465 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3466 if (nlh == NULL) 3467 return -EMSGSIZE; 3468 3469 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3470 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3471 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3472 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3473 nlmsg_cancel(skb, nlh); 3474 return -EMSGSIZE; 3475 } 3476 3477 return nlmsg_end(skb, nlh); 3478 } 3479 3480 enum addr_type_t 3481 { 3482 UNICAST_ADDR, 3483 MULTICAST_ADDR, 3484 ANYCAST_ADDR, 3485 }; 3486 3487 /* called with rcu_read_lock() */ 3488 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3489 struct netlink_callback *cb, enum addr_type_t type, 3490 int s_ip_idx, int *p_ip_idx) 3491 { 3492 struct inet6_ifaddr *ifa; 3493 struct ifmcaddr6 *ifmca; 3494 struct ifacaddr6 *ifaca; 3495 int err = 1; 3496 int ip_idx = *p_ip_idx; 3497 3498 read_lock_bh(&idev->lock); 3499 switch (type) { 3500 case UNICAST_ADDR: 3501 /* unicast address incl. temp addr */ 3502 for (ifa = idev->addr_list; ifa; 3503 ifa = ifa->if_next, ip_idx++) { 3504 if (ip_idx < s_ip_idx) 3505 continue; 3506 err = inet6_fill_ifaddr(skb, ifa, 3507 NETLINK_CB(cb->skb).pid, 3508 cb->nlh->nlmsg_seq, 3509 RTM_NEWADDR, 3510 NLM_F_MULTI); 3511 if (err <= 0) 3512 break; 3513 } 3514 break; 3515 case MULTICAST_ADDR: 3516 /* multicast address */ 3517 for (ifmca = idev->mc_list; ifmca; 3518 ifmca = ifmca->next, ip_idx++) { 3519 if (ip_idx < s_ip_idx) 3520 continue; 3521 err = inet6_fill_ifmcaddr(skb, ifmca, 3522 NETLINK_CB(cb->skb).pid, 3523 cb->nlh->nlmsg_seq, 3524 RTM_GETMULTICAST, 3525 NLM_F_MULTI); 3526 if (err <= 0) 3527 break; 3528 } 3529 break; 3530 case ANYCAST_ADDR: 3531 /* anycast address */ 3532 for (ifaca = idev->ac_list; ifaca; 3533 ifaca = ifaca->aca_next, ip_idx++) { 3534 if (ip_idx < s_ip_idx) 3535 continue; 3536 err = inet6_fill_ifacaddr(skb, ifaca, 3537 NETLINK_CB(cb->skb).pid, 3538 cb->nlh->nlmsg_seq, 3539 RTM_GETANYCAST, 3540 NLM_F_MULTI); 3541 if (err <= 0) 3542 break; 3543 } 3544 break; 3545 default: 3546 break; 3547 } 3548 read_unlock_bh(&idev->lock); 3549 *p_ip_idx = ip_idx; 3550 return err; 3551 } 3552 3553 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3554 enum addr_type_t type) 3555 { 3556 struct net *net = sock_net(skb->sk); 3557 int h, s_h; 3558 int idx, ip_idx; 3559 int s_idx, s_ip_idx; 3560 struct net_device *dev; 3561 struct inet6_dev *idev; 3562 struct hlist_head *head; 3563 struct hlist_node *node; 3564 3565 s_h = cb->args[0]; 3566 s_idx = idx = cb->args[1]; 3567 s_ip_idx = ip_idx = cb->args[2]; 3568 3569 rcu_read_lock(); 3570 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3571 idx = 0; 3572 head = &net->dev_index_head[h]; 3573 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3574 if (idx < s_idx) 3575 goto cont; 3576 if (idx > s_idx) 3577 s_ip_idx = 0; 3578 ip_idx = 0; 3579 if ((idev = __in6_dev_get(dev)) == NULL) 3580 goto cont; 3581 3582 if (in6_dump_addrs(idev, skb, cb, type, 3583 s_ip_idx, &ip_idx) <= 0) 3584 goto done; 3585 cont: 3586 idx++; 3587 } 3588 } 3589 done: 3590 rcu_read_unlock(); 3591 cb->args[0] = h; 3592 cb->args[1] = idx; 3593 cb->args[2] = ip_idx; 3594 3595 return skb->len; 3596 } 3597 3598 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3599 { 3600 enum addr_type_t type = UNICAST_ADDR; 3601 3602 return inet6_dump_addr(skb, cb, type); 3603 } 3604 3605 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3606 { 3607 enum addr_type_t type = MULTICAST_ADDR; 3608 3609 return inet6_dump_addr(skb, cb, type); 3610 } 3611 3612 3613 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3614 { 3615 enum addr_type_t type = ANYCAST_ADDR; 3616 3617 return inet6_dump_addr(skb, cb, type); 3618 } 3619 3620 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3621 void *arg) 3622 { 3623 struct net *net = sock_net(in_skb->sk); 3624 struct ifaddrmsg *ifm; 3625 struct nlattr *tb[IFA_MAX+1]; 3626 struct in6_addr *addr = NULL; 3627 struct net_device *dev = NULL; 3628 struct inet6_ifaddr *ifa; 3629 struct sk_buff *skb; 3630 int err; 3631 3632 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3633 if (err < 0) 3634 goto errout; 3635 3636 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3637 if (addr == NULL) { 3638 err = -EINVAL; 3639 goto errout; 3640 } 3641 3642 ifm = nlmsg_data(nlh); 3643 if (ifm->ifa_index) 3644 dev = __dev_get_by_index(net, ifm->ifa_index); 3645 3646 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3647 err = -EADDRNOTAVAIL; 3648 goto errout; 3649 } 3650 3651 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3652 err = -ENOBUFS; 3653 goto errout_ifa; 3654 } 3655 3656 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3657 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3658 if (err < 0) { 3659 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3660 WARN_ON(err == -EMSGSIZE); 3661 kfree_skb(skb); 3662 goto errout_ifa; 3663 } 3664 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3665 errout_ifa: 3666 in6_ifa_put(ifa); 3667 errout: 3668 return err; 3669 } 3670 3671 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3672 { 3673 struct sk_buff *skb; 3674 struct net *net = dev_net(ifa->idev->dev); 3675 int err = -ENOBUFS; 3676 3677 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3678 if (skb == NULL) 3679 goto errout; 3680 3681 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3682 if (err < 0) { 3683 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3684 WARN_ON(err == -EMSGSIZE); 3685 kfree_skb(skb); 3686 goto errout; 3687 } 3688 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3689 return; 3690 errout: 3691 if (err < 0) 3692 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3693 } 3694 3695 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3696 __s32 *array, int bytes) 3697 { 3698 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3699 3700 memset(array, 0, bytes); 3701 array[DEVCONF_FORWARDING] = cnf->forwarding; 3702 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3703 array[DEVCONF_MTU6] = cnf->mtu6; 3704 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3705 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3706 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3707 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3708 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3709 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3710 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3711 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3712 #ifdef CONFIG_IPV6_PRIVACY 3713 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3714 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3715 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3716 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3717 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3718 #endif 3719 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3720 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3721 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3722 #ifdef CONFIG_IPV6_ROUTER_PREF 3723 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3724 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3725 #ifdef CONFIG_IPV6_ROUTE_INFO 3726 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3727 #endif 3728 #endif 3729 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3730 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3731 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3732 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3733 #endif 3734 #ifdef CONFIG_IPV6_MROUTE 3735 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3736 #endif 3737 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3738 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3739 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3740 } 3741 3742 static inline size_t inet6_if_nlmsg_size(void) 3743 { 3744 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3745 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3746 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3747 + nla_total_size(4) /* IFLA_MTU */ 3748 + nla_total_size(4) /* IFLA_LINK */ 3749 + nla_total_size( /* IFLA_PROTINFO */ 3750 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3751 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3752 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3753 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3754 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3755 ); 3756 } 3757 3758 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3759 int bytes) 3760 { 3761 int i; 3762 int pad = bytes - sizeof(u64) * items; 3763 BUG_ON(pad < 0); 3764 3765 /* Use put_unaligned() because stats may not be aligned for u64. */ 3766 put_unaligned(items, &stats[0]); 3767 for (i = 1; i < items; i++) 3768 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3769 3770 memset(&stats[items], 0, pad); 3771 } 3772 3773 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3774 int bytes) 3775 { 3776 switch(attrtype) { 3777 case IFLA_INET6_STATS: 3778 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3779 break; 3780 case IFLA_INET6_ICMP6STATS: 3781 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3782 break; 3783 } 3784 } 3785 3786 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3787 u32 pid, u32 seq, int event, unsigned int flags) 3788 { 3789 struct net_device *dev = idev->dev; 3790 struct nlattr *nla; 3791 struct ifinfomsg *hdr; 3792 struct nlmsghdr *nlh; 3793 void *protoinfo; 3794 struct ifla_cacheinfo ci; 3795 3796 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3797 if (nlh == NULL) 3798 return -EMSGSIZE; 3799 3800 hdr = nlmsg_data(nlh); 3801 hdr->ifi_family = AF_INET6; 3802 hdr->__ifi_pad = 0; 3803 hdr->ifi_type = dev->type; 3804 hdr->ifi_index = dev->ifindex; 3805 hdr->ifi_flags = dev_get_flags(dev); 3806 hdr->ifi_change = 0; 3807 3808 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3809 3810 if (dev->addr_len) 3811 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3812 3813 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3814 if (dev->ifindex != dev->iflink) 3815 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3816 3817 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3818 if (protoinfo == NULL) 3819 goto nla_put_failure; 3820 3821 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3822 3823 ci.max_reasm_len = IPV6_MAXPLEN; 3824 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3825 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3826 ci.reachable_time = idev->nd_parms->reachable_time; 3827 ci.retrans_time = idev->nd_parms->retrans_time; 3828 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3829 3830 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3831 if (nla == NULL) 3832 goto nla_put_failure; 3833 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3834 3835 /* XXX - MC not implemented */ 3836 3837 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3838 if (nla == NULL) 3839 goto nla_put_failure; 3840 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3841 3842 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3843 if (nla == NULL) 3844 goto nla_put_failure; 3845 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3846 3847 nla_nest_end(skb, protoinfo); 3848 return nlmsg_end(skb, nlh); 3849 3850 nla_put_failure: 3851 nlmsg_cancel(skb, nlh); 3852 return -EMSGSIZE; 3853 } 3854 3855 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3856 { 3857 struct net *net = sock_net(skb->sk); 3858 int h, s_h; 3859 int idx = 0, s_idx; 3860 struct net_device *dev; 3861 struct inet6_dev *idev; 3862 struct hlist_head *head; 3863 struct hlist_node *node; 3864 3865 s_h = cb->args[0]; 3866 s_idx = cb->args[1]; 3867 3868 rcu_read_lock(); 3869 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3870 idx = 0; 3871 head = &net->dev_index_head[h]; 3872 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3873 if (idx < s_idx) 3874 goto cont; 3875 idev = __in6_dev_get(dev); 3876 if (!idev) 3877 goto cont; 3878 if (inet6_fill_ifinfo(skb, idev, 3879 NETLINK_CB(cb->skb).pid, 3880 cb->nlh->nlmsg_seq, 3881 RTM_NEWLINK, NLM_F_MULTI) <= 0) 3882 goto out; 3883 cont: 3884 idx++; 3885 } 3886 } 3887 out: 3888 rcu_read_unlock(); 3889 cb->args[1] = idx; 3890 cb->args[0] = h; 3891 3892 return skb->len; 3893 } 3894 3895 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3896 { 3897 struct sk_buff *skb; 3898 struct net *net = dev_net(idev->dev); 3899 int err = -ENOBUFS; 3900 3901 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3902 if (skb == NULL) 3903 goto errout; 3904 3905 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3906 if (err < 0) { 3907 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3908 WARN_ON(err == -EMSGSIZE); 3909 kfree_skb(skb); 3910 goto errout; 3911 } 3912 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3913 return; 3914 errout: 3915 if (err < 0) 3916 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3917 } 3918 3919 static inline size_t inet6_prefix_nlmsg_size(void) 3920 { 3921 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3922 + nla_total_size(sizeof(struct in6_addr)) 3923 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3924 } 3925 3926 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3927 struct prefix_info *pinfo, u32 pid, u32 seq, 3928 int event, unsigned int flags) 3929 { 3930 struct prefixmsg *pmsg; 3931 struct nlmsghdr *nlh; 3932 struct prefix_cacheinfo ci; 3933 3934 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3935 if (nlh == NULL) 3936 return -EMSGSIZE; 3937 3938 pmsg = nlmsg_data(nlh); 3939 pmsg->prefix_family = AF_INET6; 3940 pmsg->prefix_pad1 = 0; 3941 pmsg->prefix_pad2 = 0; 3942 pmsg->prefix_ifindex = idev->dev->ifindex; 3943 pmsg->prefix_len = pinfo->prefix_len; 3944 pmsg->prefix_type = pinfo->type; 3945 pmsg->prefix_pad3 = 0; 3946 pmsg->prefix_flags = 0; 3947 if (pinfo->onlink) 3948 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3949 if (pinfo->autoconf) 3950 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3951 3952 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3953 3954 ci.preferred_time = ntohl(pinfo->prefered); 3955 ci.valid_time = ntohl(pinfo->valid); 3956 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3957 3958 return nlmsg_end(skb, nlh); 3959 3960 nla_put_failure: 3961 nlmsg_cancel(skb, nlh); 3962 return -EMSGSIZE; 3963 } 3964 3965 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3966 struct prefix_info *pinfo) 3967 { 3968 struct sk_buff *skb; 3969 struct net *net = dev_net(idev->dev); 3970 int err = -ENOBUFS; 3971 3972 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3973 if (skb == NULL) 3974 goto errout; 3975 3976 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3977 if (err < 0) { 3978 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3979 WARN_ON(err == -EMSGSIZE); 3980 kfree_skb(skb); 3981 goto errout; 3982 } 3983 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3984 return; 3985 errout: 3986 if (err < 0) 3987 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3988 } 3989 3990 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3991 { 3992 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3993 3994 switch (event) { 3995 case RTM_NEWADDR: 3996 /* 3997 * If the address was optimistic 3998 * we inserted the route at the start of 3999 * our DAD process, so we don't need 4000 * to do it again 4001 */ 4002 if (!(ifp->rt->rt6i_node)) 4003 ip6_ins_rt(ifp->rt); 4004 if (ifp->idev->cnf.forwarding) 4005 addrconf_join_anycast(ifp); 4006 break; 4007 case RTM_DELADDR: 4008 if (ifp->idev->cnf.forwarding) 4009 addrconf_leave_anycast(ifp); 4010 addrconf_leave_solict(ifp->idev, &ifp->addr); 4011 dst_hold(&ifp->rt->u.dst); 4012 if (ip6_del_rt(ifp->rt)) 4013 dst_free(&ifp->rt->u.dst); 4014 break; 4015 } 4016 } 4017 4018 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4019 { 4020 rcu_read_lock_bh(); 4021 if (likely(ifp->idev->dead == 0)) 4022 __ipv6_ifa_notify(event, ifp); 4023 rcu_read_unlock_bh(); 4024 } 4025 4026 #ifdef CONFIG_SYSCTL 4027 4028 static 4029 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4030 void __user *buffer, size_t *lenp, loff_t *ppos) 4031 { 4032 int *valp = ctl->data; 4033 int val = *valp; 4034 loff_t pos = *ppos; 4035 int ret; 4036 4037 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4038 4039 if (write) 4040 ret = addrconf_fixup_forwarding(ctl, valp, val); 4041 if (ret) 4042 *ppos = pos; 4043 return ret; 4044 } 4045 4046 static void dev_disable_change(struct inet6_dev *idev) 4047 { 4048 if (!idev || !idev->dev) 4049 return; 4050 4051 if (idev->cnf.disable_ipv6) 4052 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4053 else 4054 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4055 } 4056 4057 static void addrconf_disable_change(struct net *net, __s32 newf) 4058 { 4059 struct net_device *dev; 4060 struct inet6_dev *idev; 4061 4062 rcu_read_lock(); 4063 for_each_netdev_rcu(net, dev) { 4064 idev = __in6_dev_get(dev); 4065 if (idev) { 4066 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4067 idev->cnf.disable_ipv6 = newf; 4068 if (changed) 4069 dev_disable_change(idev); 4070 } 4071 } 4072 rcu_read_unlock(); 4073 } 4074 4075 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4076 { 4077 struct net *net; 4078 4079 net = (struct net *)table->extra2; 4080 4081 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4082 return 0; 4083 4084 if (!rtnl_trylock()) { 4085 /* Restore the original values before restarting */ 4086 *p = old; 4087 return restart_syscall(); 4088 } 4089 4090 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4091 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4092 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4093 addrconf_disable_change(net, newf); 4094 } else if ((!*p) ^ (!old)) 4095 dev_disable_change((struct inet6_dev *)table->extra1); 4096 4097 rtnl_unlock(); 4098 return 0; 4099 } 4100 4101 static 4102 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4103 void __user *buffer, size_t *lenp, loff_t *ppos) 4104 { 4105 int *valp = ctl->data; 4106 int val = *valp; 4107 loff_t pos = *ppos; 4108 int ret; 4109 4110 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4111 4112 if (write) 4113 ret = addrconf_disable_ipv6(ctl, valp, val); 4114 if (ret) 4115 *ppos = pos; 4116 return ret; 4117 } 4118 4119 static struct addrconf_sysctl_table 4120 { 4121 struct ctl_table_header *sysctl_header; 4122 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4123 char *dev_name; 4124 } addrconf_sysctl __read_mostly = { 4125 .sysctl_header = NULL, 4126 .addrconf_vars = { 4127 { 4128 .procname = "forwarding", 4129 .data = &ipv6_devconf.forwarding, 4130 .maxlen = sizeof(int), 4131 .mode = 0644, 4132 .proc_handler = addrconf_sysctl_forward, 4133 }, 4134 { 4135 .procname = "hop_limit", 4136 .data = &ipv6_devconf.hop_limit, 4137 .maxlen = sizeof(int), 4138 .mode = 0644, 4139 .proc_handler = proc_dointvec, 4140 }, 4141 { 4142 .procname = "mtu", 4143 .data = &ipv6_devconf.mtu6, 4144 .maxlen = sizeof(int), 4145 .mode = 0644, 4146 .proc_handler = proc_dointvec, 4147 }, 4148 { 4149 .procname = "accept_ra", 4150 .data = &ipv6_devconf.accept_ra, 4151 .maxlen = sizeof(int), 4152 .mode = 0644, 4153 .proc_handler = proc_dointvec, 4154 }, 4155 { 4156 .procname = "accept_redirects", 4157 .data = &ipv6_devconf.accept_redirects, 4158 .maxlen = sizeof(int), 4159 .mode = 0644, 4160 .proc_handler = proc_dointvec, 4161 }, 4162 { 4163 .procname = "autoconf", 4164 .data = &ipv6_devconf.autoconf, 4165 .maxlen = sizeof(int), 4166 .mode = 0644, 4167 .proc_handler = proc_dointvec, 4168 }, 4169 { 4170 .procname = "dad_transmits", 4171 .data = &ipv6_devconf.dad_transmits, 4172 .maxlen = sizeof(int), 4173 .mode = 0644, 4174 .proc_handler = proc_dointvec, 4175 }, 4176 { 4177 .procname = "router_solicitations", 4178 .data = &ipv6_devconf.rtr_solicits, 4179 .maxlen = sizeof(int), 4180 .mode = 0644, 4181 .proc_handler = proc_dointvec, 4182 }, 4183 { 4184 .procname = "router_solicitation_interval", 4185 .data = &ipv6_devconf.rtr_solicit_interval, 4186 .maxlen = sizeof(int), 4187 .mode = 0644, 4188 .proc_handler = proc_dointvec_jiffies, 4189 }, 4190 { 4191 .procname = "router_solicitation_delay", 4192 .data = &ipv6_devconf.rtr_solicit_delay, 4193 .maxlen = sizeof(int), 4194 .mode = 0644, 4195 .proc_handler = proc_dointvec_jiffies, 4196 }, 4197 { 4198 .procname = "force_mld_version", 4199 .data = &ipv6_devconf.force_mld_version, 4200 .maxlen = sizeof(int), 4201 .mode = 0644, 4202 .proc_handler = proc_dointvec, 4203 }, 4204 #ifdef CONFIG_IPV6_PRIVACY 4205 { 4206 .procname = "use_tempaddr", 4207 .data = &ipv6_devconf.use_tempaddr, 4208 .maxlen = sizeof(int), 4209 .mode = 0644, 4210 .proc_handler = proc_dointvec, 4211 }, 4212 { 4213 .procname = "temp_valid_lft", 4214 .data = &ipv6_devconf.temp_valid_lft, 4215 .maxlen = sizeof(int), 4216 .mode = 0644, 4217 .proc_handler = proc_dointvec, 4218 }, 4219 { 4220 .procname = "temp_prefered_lft", 4221 .data = &ipv6_devconf.temp_prefered_lft, 4222 .maxlen = sizeof(int), 4223 .mode = 0644, 4224 .proc_handler = proc_dointvec, 4225 }, 4226 { 4227 .procname = "regen_max_retry", 4228 .data = &ipv6_devconf.regen_max_retry, 4229 .maxlen = sizeof(int), 4230 .mode = 0644, 4231 .proc_handler = proc_dointvec, 4232 }, 4233 { 4234 .procname = "max_desync_factor", 4235 .data = &ipv6_devconf.max_desync_factor, 4236 .maxlen = sizeof(int), 4237 .mode = 0644, 4238 .proc_handler = proc_dointvec, 4239 }, 4240 #endif 4241 { 4242 .procname = "max_addresses", 4243 .data = &ipv6_devconf.max_addresses, 4244 .maxlen = sizeof(int), 4245 .mode = 0644, 4246 .proc_handler = proc_dointvec, 4247 }, 4248 { 4249 .procname = "accept_ra_defrtr", 4250 .data = &ipv6_devconf.accept_ra_defrtr, 4251 .maxlen = sizeof(int), 4252 .mode = 0644, 4253 .proc_handler = proc_dointvec, 4254 }, 4255 { 4256 .procname = "accept_ra_pinfo", 4257 .data = &ipv6_devconf.accept_ra_pinfo, 4258 .maxlen = sizeof(int), 4259 .mode = 0644, 4260 .proc_handler = proc_dointvec, 4261 }, 4262 #ifdef CONFIG_IPV6_ROUTER_PREF 4263 { 4264 .procname = "accept_ra_rtr_pref", 4265 .data = &ipv6_devconf.accept_ra_rtr_pref, 4266 .maxlen = sizeof(int), 4267 .mode = 0644, 4268 .proc_handler = proc_dointvec, 4269 }, 4270 { 4271 .procname = "router_probe_interval", 4272 .data = &ipv6_devconf.rtr_probe_interval, 4273 .maxlen = sizeof(int), 4274 .mode = 0644, 4275 .proc_handler = proc_dointvec_jiffies, 4276 }, 4277 #ifdef CONFIG_IPV6_ROUTE_INFO 4278 { 4279 .procname = "accept_ra_rt_info_max_plen", 4280 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4281 .maxlen = sizeof(int), 4282 .mode = 0644, 4283 .proc_handler = proc_dointvec, 4284 }, 4285 #endif 4286 #endif 4287 { 4288 .procname = "proxy_ndp", 4289 .data = &ipv6_devconf.proxy_ndp, 4290 .maxlen = sizeof(int), 4291 .mode = 0644, 4292 .proc_handler = proc_dointvec, 4293 }, 4294 { 4295 .procname = "accept_source_route", 4296 .data = &ipv6_devconf.accept_source_route, 4297 .maxlen = sizeof(int), 4298 .mode = 0644, 4299 .proc_handler = proc_dointvec, 4300 }, 4301 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4302 { 4303 .procname = "optimistic_dad", 4304 .data = &ipv6_devconf.optimistic_dad, 4305 .maxlen = sizeof(int), 4306 .mode = 0644, 4307 .proc_handler = proc_dointvec, 4308 4309 }, 4310 #endif 4311 #ifdef CONFIG_IPV6_MROUTE 4312 { 4313 .procname = "mc_forwarding", 4314 .data = &ipv6_devconf.mc_forwarding, 4315 .maxlen = sizeof(int), 4316 .mode = 0444, 4317 .proc_handler = proc_dointvec, 4318 }, 4319 #endif 4320 { 4321 .procname = "disable_ipv6", 4322 .data = &ipv6_devconf.disable_ipv6, 4323 .maxlen = sizeof(int), 4324 .mode = 0644, 4325 .proc_handler = addrconf_sysctl_disable, 4326 }, 4327 { 4328 .procname = "accept_dad", 4329 .data = &ipv6_devconf.accept_dad, 4330 .maxlen = sizeof(int), 4331 .mode = 0644, 4332 .proc_handler = proc_dointvec, 4333 }, 4334 { 4335 .procname = "force_tllao", 4336 .data = &ipv6_devconf.force_tllao, 4337 .maxlen = sizeof(int), 4338 .mode = 0644, 4339 .proc_handler = proc_dointvec 4340 }, 4341 { 4342 /* sentinel */ 4343 } 4344 }, 4345 }; 4346 4347 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4348 struct inet6_dev *idev, struct ipv6_devconf *p) 4349 { 4350 int i; 4351 struct addrconf_sysctl_table *t; 4352 4353 #define ADDRCONF_CTL_PATH_DEV 3 4354 4355 struct ctl_path addrconf_ctl_path[] = { 4356 { .procname = "net", }, 4357 { .procname = "ipv6", }, 4358 { .procname = "conf", }, 4359 { /* to be set */ }, 4360 { }, 4361 }; 4362 4363 4364 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4365 if (t == NULL) 4366 goto out; 4367 4368 for (i=0; t->addrconf_vars[i].data; i++) { 4369 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4370 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4371 t->addrconf_vars[i].extra2 = net; 4372 } 4373 4374 /* 4375 * Make a copy of dev_name, because '.procname' is regarded as const 4376 * by sysctl and we wouldn't want anyone to change it under our feet 4377 * (see SIOCSIFNAME). 4378 */ 4379 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4380 if (!t->dev_name) 4381 goto free; 4382 4383 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4384 4385 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4386 t->addrconf_vars); 4387 if (t->sysctl_header == NULL) 4388 goto free_procname; 4389 4390 p->sysctl = t; 4391 return 0; 4392 4393 free_procname: 4394 kfree(t->dev_name); 4395 free: 4396 kfree(t); 4397 out: 4398 return -ENOBUFS; 4399 } 4400 4401 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4402 { 4403 struct addrconf_sysctl_table *t; 4404 4405 if (p->sysctl == NULL) 4406 return; 4407 4408 t = p->sysctl; 4409 p->sysctl = NULL; 4410 unregister_sysctl_table(t->sysctl_header); 4411 kfree(t->dev_name); 4412 kfree(t); 4413 } 4414 4415 static void addrconf_sysctl_register(struct inet6_dev *idev) 4416 { 4417 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4418 NET_IPV6_NEIGH, "ipv6", 4419 &ndisc_ifinfo_sysctl_change); 4420 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4421 idev, &idev->cnf); 4422 } 4423 4424 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4425 { 4426 __addrconf_sysctl_unregister(&idev->cnf); 4427 neigh_sysctl_unregister(idev->nd_parms); 4428 } 4429 4430 4431 #endif 4432 4433 static int addrconf_init_net(struct net *net) 4434 { 4435 int err; 4436 struct ipv6_devconf *all, *dflt; 4437 4438 err = -ENOMEM; 4439 all = &ipv6_devconf; 4440 dflt = &ipv6_devconf_dflt; 4441 4442 if (!net_eq(net, &init_net)) { 4443 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4444 if (all == NULL) 4445 goto err_alloc_all; 4446 4447 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4448 if (dflt == NULL) 4449 goto err_alloc_dflt; 4450 } else { 4451 /* these will be inherited by all namespaces */ 4452 dflt->autoconf = ipv6_defaults.autoconf; 4453 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4454 } 4455 4456 net->ipv6.devconf_all = all; 4457 net->ipv6.devconf_dflt = dflt; 4458 4459 #ifdef CONFIG_SYSCTL 4460 err = __addrconf_sysctl_register(net, "all", NULL, all); 4461 if (err < 0) 4462 goto err_reg_all; 4463 4464 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4465 if (err < 0) 4466 goto err_reg_dflt; 4467 #endif 4468 return 0; 4469 4470 #ifdef CONFIG_SYSCTL 4471 err_reg_dflt: 4472 __addrconf_sysctl_unregister(all); 4473 err_reg_all: 4474 kfree(dflt); 4475 #endif 4476 err_alloc_dflt: 4477 kfree(all); 4478 err_alloc_all: 4479 return err; 4480 } 4481 4482 static void addrconf_exit_net(struct net *net) 4483 { 4484 #ifdef CONFIG_SYSCTL 4485 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4486 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4487 #endif 4488 if (!net_eq(net, &init_net)) { 4489 kfree(net->ipv6.devconf_dflt); 4490 kfree(net->ipv6.devconf_all); 4491 } 4492 } 4493 4494 static struct pernet_operations addrconf_ops = { 4495 .init = addrconf_init_net, 4496 .exit = addrconf_exit_net, 4497 }; 4498 4499 /* 4500 * Device notifier 4501 */ 4502 4503 int register_inet6addr_notifier(struct notifier_block *nb) 4504 { 4505 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4506 } 4507 4508 EXPORT_SYMBOL(register_inet6addr_notifier); 4509 4510 int unregister_inet6addr_notifier(struct notifier_block *nb) 4511 { 4512 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4513 } 4514 4515 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4516 4517 /* 4518 * Init / cleanup code 4519 */ 4520 4521 int __init addrconf_init(void) 4522 { 4523 int err; 4524 4525 if ((err = ipv6_addr_label_init()) < 0) { 4526 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4527 err); 4528 return err; 4529 } 4530 4531 register_pernet_subsys(&addrconf_ops); 4532 4533 /* The addrconf netdev notifier requires that loopback_dev 4534 * has it's ipv6 private information allocated and setup 4535 * before it can bring up and give link-local addresses 4536 * to other devices which are up. 4537 * 4538 * Unfortunately, loopback_dev is not necessarily the first 4539 * entry in the global dev_base list of net devices. In fact, 4540 * it is likely to be the very last entry on that list. 4541 * So this causes the notifier registry below to try and 4542 * give link-local addresses to all devices besides loopback_dev 4543 * first, then loopback_dev, which cases all the non-loopback_dev 4544 * devices to fail to get a link-local address. 4545 * 4546 * So, as a temporary fix, allocate the ipv6 structure for 4547 * loopback_dev first by hand. 4548 * Longer term, all of the dependencies ipv6 has upon the loopback 4549 * device and it being up should be removed. 4550 */ 4551 rtnl_lock(); 4552 if (!ipv6_add_dev(init_net.loopback_dev)) 4553 err = -ENOMEM; 4554 rtnl_unlock(); 4555 if (err) 4556 goto errlo; 4557 4558 register_netdevice_notifier(&ipv6_dev_notf); 4559 4560 addrconf_verify(0); 4561 4562 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4563 if (err < 0) 4564 goto errout; 4565 4566 /* Only the first call to __rtnl_register can fail */ 4567 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4568 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4569 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4570 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4571 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4572 4573 ipv6_addr_label_rtnl_register(); 4574 4575 return 0; 4576 errout: 4577 unregister_netdevice_notifier(&ipv6_dev_notf); 4578 errlo: 4579 unregister_pernet_subsys(&addrconf_ops); 4580 4581 return err; 4582 } 4583 4584 void addrconf_cleanup(void) 4585 { 4586 struct inet6_ifaddr *ifa; 4587 struct net_device *dev; 4588 int i; 4589 4590 unregister_netdevice_notifier(&ipv6_dev_notf); 4591 unregister_pernet_subsys(&addrconf_ops); 4592 4593 rtnl_lock(); 4594 4595 /* clean dev list */ 4596 for_each_netdev(&init_net, dev) { 4597 if (__in6_dev_get(dev) == NULL) 4598 continue; 4599 addrconf_ifdown(dev, 1); 4600 } 4601 addrconf_ifdown(init_net.loopback_dev, 2); 4602 4603 /* 4604 * Check hash table. 4605 */ 4606 write_lock_bh(&addrconf_hash_lock); 4607 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4608 for (ifa=inet6_addr_lst[i]; ifa; ) { 4609 struct inet6_ifaddr *bifa; 4610 4611 bifa = ifa; 4612 ifa = ifa->lst_next; 4613 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4614 /* Do not free it; something is wrong. 4615 Now we can investigate it with debugger. 4616 */ 4617 } 4618 } 4619 write_unlock_bh(&addrconf_hash_lock); 4620 4621 del_timer(&addr_chk_timer); 4622 rtnl_unlock(); 4623 } 4624