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