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 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 /* 18 * Changes: 19 * 20 * Janos Farkas : delete timer on ifdown 21 * <chexum@bankinf.banki.hu> 22 * Andi Kleen : kill double kfree on module 23 * unload. 24 * Maciej W. Rozycki : FDDI support 25 * sekiya@USAGI : Don't send too many RS 26 * packets. 27 * yoshfuji@USAGI : Fixed interval between DAD 28 * packets. 29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 30 * address validation timer. 31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 32 * support. 33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 34 * address on a same interface. 35 * YOSHIFUJI Hideaki @USAGI : ARCnet support 36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 37 * seq_file. 38 * YOSHIFUJI Hideaki @USAGI : improved source address 39 * selection; consider scope, 40 * status etc. 41 */ 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/socket.h> 46 #include <linux/sockios.h> 47 #include <linux/net.h> 48 #include <linux/in6.h> 49 #include <linux/netdevice.h> 50 #include <linux/if_addr.h> 51 #include <linux/if_arp.h> 52 #include <linux/if_arcnet.h> 53 #include <linux/if_infiniband.h> 54 #include <linux/route.h> 55 #include <linux/inetdevice.h> 56 #include <linux/init.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <asm/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 91 /* Set to 3 to get tracing... */ 92 #define ACONF_DEBUG 2 93 94 #if ACONF_DEBUG >= 3 95 #define ADBG(x) printk x 96 #else 97 #define ADBG(x) 98 #endif 99 100 #define INFINITY_LIFE_TIME 0xFFFFFFFF 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 102 103 #ifdef CONFIG_SYSCTL 104 static void addrconf_sysctl_register(struct inet6_dev *idev); 105 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 106 #else 107 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 108 { 109 } 110 111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 112 { 113 } 114 #endif 115 116 #ifdef CONFIG_IPV6_PRIVACY 117 static int __ipv6_regen_rndid(struct inet6_dev *idev); 118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 119 static void ipv6_regen_rndid(unsigned long data); 120 121 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 122 #endif 123 124 static int ipv6_count_addresses(struct inet6_dev *idev); 125 126 /* 127 * Configured unicast address hash table 128 */ 129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 130 static DEFINE_RWLOCK(addrconf_hash_lock); 131 132 static void addrconf_verify(unsigned long); 133 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 135 static DEFINE_SPINLOCK(addrconf_verify_lock); 136 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 139 140 static int addrconf_ifdown(struct net_device *dev, int how); 141 142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 143 static void addrconf_dad_timer(unsigned long data); 144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 145 static void addrconf_dad_run(struct inet6_dev *idev); 146 static void addrconf_rs_timer(unsigned long data); 147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 149 150 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 151 struct prefix_info *pinfo); 152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 153 struct net_device *dev); 154 155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 156 157 struct ipv6_devconf ipv6_devconf __read_mostly = { 158 .forwarding = 0, 159 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 160 .mtu6 = IPV6_MIN_MTU, 161 .accept_ra = 1, 162 .accept_redirects = 1, 163 .autoconf = 1, 164 .force_mld_version = 0, 165 .dad_transmits = 1, 166 .rtr_solicits = MAX_RTR_SOLICITATIONS, 167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 169 #ifdef CONFIG_IPV6_PRIVACY 170 .use_tempaddr = 0, 171 .temp_valid_lft = TEMP_VALID_LIFETIME, 172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 173 .regen_max_retry = REGEN_MAX_RETRY, 174 .max_desync_factor = MAX_DESYNC_FACTOR, 175 #endif 176 .max_addresses = IPV6_MAX_ADDRESSES, 177 .accept_ra_defrtr = 1, 178 .accept_ra_pinfo = 1, 179 #ifdef CONFIG_IPV6_ROUTER_PREF 180 .accept_ra_rtr_pref = 1, 181 .rtr_probe_interval = 60 * HZ, 182 #ifdef CONFIG_IPV6_ROUTE_INFO 183 .accept_ra_rt_info_max_plen = 0, 184 #endif 185 #endif 186 .proxy_ndp = 0, 187 .accept_source_route = 0, /* we do not accept RH0 by default. */ 188 }; 189 190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .dad_transmits = 1, 198 .rtr_solicits = MAX_RTR_SOLICITATIONS, 199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 201 #ifdef CONFIG_IPV6_PRIVACY 202 .use_tempaddr = 0, 203 .temp_valid_lft = TEMP_VALID_LIFETIME, 204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 205 .regen_max_retry = REGEN_MAX_RETRY, 206 .max_desync_factor = MAX_DESYNC_FACTOR, 207 #endif 208 .max_addresses = IPV6_MAX_ADDRESSES, 209 .accept_ra_defrtr = 1, 210 .accept_ra_pinfo = 1, 211 #ifdef CONFIG_IPV6_ROUTER_PREF 212 .accept_ra_rtr_pref = 1, 213 .rtr_probe_interval = 60 * HZ, 214 #ifdef CONFIG_IPV6_ROUTE_INFO 215 .accept_ra_rt_info_max_plen = 0, 216 #endif 217 #endif 218 .proxy_ndp = 0, 219 .accept_source_route = 0, /* we do not accept RH0 by default. */ 220 }; 221 222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 225 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 226 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 227 228 /* Check if a valid qdisc is available */ 229 static inline int addrconf_qdisc_ok(struct net_device *dev) 230 { 231 return (dev->qdisc != &noop_qdisc); 232 } 233 234 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 235 { 236 if (del_timer(&ifp->timer)) 237 __in6_ifa_put(ifp); 238 } 239 240 enum addrconf_timer_t 241 { 242 AC_NONE, 243 AC_DAD, 244 AC_RS, 245 }; 246 247 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 248 enum addrconf_timer_t what, 249 unsigned long when) 250 { 251 if (!del_timer(&ifp->timer)) 252 in6_ifa_hold(ifp); 253 254 switch (what) { 255 case AC_DAD: 256 ifp->timer.function = addrconf_dad_timer; 257 break; 258 case AC_RS: 259 ifp->timer.function = addrconf_rs_timer; 260 break; 261 default:; 262 } 263 ifp->timer.expires = jiffies + when; 264 add_timer(&ifp->timer); 265 } 266 267 static int snmp6_alloc_dev(struct inet6_dev *idev) 268 { 269 if (snmp_mib_init((void **)idev->stats.ipv6, 270 sizeof(struct ipstats_mib)) < 0) 271 goto err_ip; 272 if (snmp_mib_init((void **)idev->stats.icmpv6, 273 sizeof(struct icmpv6_mib)) < 0) 274 goto err_icmp; 275 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 276 sizeof(struct icmpv6msg_mib)) < 0) 277 goto err_icmpmsg; 278 279 return 0; 280 281 err_icmpmsg: 282 snmp_mib_free((void **)idev->stats.icmpv6); 283 err_icmp: 284 snmp_mib_free((void **)idev->stats.ipv6); 285 err_ip: 286 return -ENOMEM; 287 } 288 289 static void snmp6_free_dev(struct inet6_dev *idev) 290 { 291 snmp_mib_free((void **)idev->stats.icmpv6msg); 292 snmp_mib_free((void **)idev->stats.icmpv6); 293 snmp_mib_free((void **)idev->stats.ipv6); 294 } 295 296 /* Nobody refers to this device, we may destroy it. */ 297 298 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 299 { 300 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 301 kfree(idev); 302 } 303 304 void in6_dev_finish_destroy(struct inet6_dev *idev) 305 { 306 struct net_device *dev = idev->dev; 307 BUG_TRAP(idev->addr_list==NULL); 308 BUG_TRAP(idev->mc_list==NULL); 309 #ifdef NET_REFCNT_DEBUG 310 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 311 #endif 312 dev_put(dev); 313 if (!idev->dead) { 314 printk("Freeing alive inet6 device %p\n", idev); 315 return; 316 } 317 snmp6_free_dev(idev); 318 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 319 } 320 321 EXPORT_SYMBOL(in6_dev_finish_destroy); 322 323 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 324 { 325 struct inet6_dev *ndev; 326 327 ASSERT_RTNL(); 328 329 if (dev->mtu < IPV6_MIN_MTU) 330 return NULL; 331 332 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 333 334 if (ndev == NULL) 335 return NULL; 336 337 rwlock_init(&ndev->lock); 338 ndev->dev = dev; 339 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 340 ndev->cnf.mtu6 = dev->mtu; 341 ndev->cnf.sysctl = NULL; 342 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 343 if (ndev->nd_parms == NULL) { 344 kfree(ndev); 345 return NULL; 346 } 347 /* We refer to the device */ 348 dev_hold(dev); 349 350 if (snmp6_alloc_dev(ndev) < 0) { 351 ADBG((KERN_WARNING 352 "%s(): cannot allocate memory for statistics; dev=%s.\n", 353 __func__, dev->name)); 354 neigh_parms_release(&nd_tbl, ndev->nd_parms); 355 ndev->dead = 1; 356 in6_dev_finish_destroy(ndev); 357 return NULL; 358 } 359 360 if (snmp6_register_dev(ndev) < 0) { 361 ADBG((KERN_WARNING 362 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 363 __func__, dev->name)); 364 neigh_parms_release(&nd_tbl, ndev->nd_parms); 365 ndev->dead = 1; 366 in6_dev_finish_destroy(ndev); 367 return NULL; 368 } 369 370 /* One reference from device. We must do this before 371 * we invoke __ipv6_regen_rndid(). 372 */ 373 in6_dev_hold(ndev); 374 375 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 376 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 377 printk(KERN_INFO 378 "%s: Disabled Multicast RS\n", 379 dev->name); 380 ndev->cnf.rtr_solicits = 0; 381 } 382 #endif 383 384 #ifdef CONFIG_IPV6_PRIVACY 385 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 386 if ((dev->flags&IFF_LOOPBACK) || 387 dev->type == ARPHRD_TUNNEL || 388 dev->type == ARPHRD_TUNNEL6 || 389 dev->type == ARPHRD_SIT || 390 dev->type == ARPHRD_NONE) { 391 printk(KERN_INFO 392 "%s: Disabled Privacy Extensions\n", 393 dev->name); 394 ndev->cnf.use_tempaddr = -1; 395 } else { 396 in6_dev_hold(ndev); 397 ipv6_regen_rndid((unsigned long) ndev); 398 } 399 #endif 400 401 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 402 ndev->if_flags |= IF_READY; 403 404 ipv6_mc_init_dev(ndev); 405 ndev->tstamp = jiffies; 406 addrconf_sysctl_register(ndev); 407 /* protected by rtnl_lock */ 408 rcu_assign_pointer(dev->ip6_ptr, ndev); 409 410 /* Join all-node multicast group */ 411 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 412 413 return ndev; 414 } 415 416 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 417 { 418 struct inet6_dev *idev; 419 420 ASSERT_RTNL(); 421 422 if ((idev = __in6_dev_get(dev)) == NULL) { 423 if ((idev = ipv6_add_dev(dev)) == NULL) 424 return NULL; 425 } 426 427 if (dev->flags&IFF_UP) 428 ipv6_mc_up(idev); 429 return idev; 430 } 431 432 #ifdef CONFIG_SYSCTL 433 static void dev_forward_change(struct inet6_dev *idev) 434 { 435 struct net_device *dev; 436 struct inet6_ifaddr *ifa; 437 438 if (!idev) 439 return; 440 dev = idev->dev; 441 if (dev && (dev->flags & IFF_MULTICAST)) { 442 if (idev->cnf.forwarding) 443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 444 else 445 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 446 } 447 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 448 if (ifa->flags&IFA_F_TENTATIVE) 449 continue; 450 if (idev->cnf.forwarding) 451 addrconf_join_anycast(ifa); 452 else 453 addrconf_leave_anycast(ifa); 454 } 455 } 456 457 458 static void addrconf_forward_change(struct net *net, __s32 newf) 459 { 460 struct net_device *dev; 461 struct inet6_dev *idev; 462 463 read_lock(&dev_base_lock); 464 for_each_netdev(net, dev) { 465 rcu_read_lock(); 466 idev = __in6_dev_get(dev); 467 if (idev) { 468 int changed = (!idev->cnf.forwarding) ^ (!newf); 469 idev->cnf.forwarding = newf; 470 if (changed) 471 dev_forward_change(idev); 472 } 473 rcu_read_unlock(); 474 } 475 read_unlock(&dev_base_lock); 476 } 477 478 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 479 { 480 struct net *net; 481 482 net = (struct net *)table->extra2; 483 if (p == &net->ipv6.devconf_dflt->forwarding) 484 return; 485 486 if (p == &net->ipv6.devconf_all->forwarding) { 487 __s32 newf = net->ipv6.devconf_all->forwarding; 488 net->ipv6.devconf_dflt->forwarding = newf; 489 addrconf_forward_change(net, newf); 490 } else if ((!*p) ^ (!old)) 491 dev_forward_change((struct inet6_dev *)table->extra1); 492 493 if (*p) 494 rt6_purge_dflt_routers(net); 495 } 496 #endif 497 498 /* Nobody refers to this ifaddr, destroy it */ 499 500 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 501 { 502 BUG_TRAP(ifp->if_next==NULL); 503 BUG_TRAP(ifp->lst_next==NULL); 504 #ifdef NET_REFCNT_DEBUG 505 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 506 #endif 507 508 in6_dev_put(ifp->idev); 509 510 if (del_timer(&ifp->timer)) 511 printk("Timer is still running, when freeing ifa=%p\n", ifp); 512 513 if (!ifp->dead) { 514 printk("Freeing alive inet6 address %p\n", ifp); 515 return; 516 } 517 dst_release(&ifp->rt->u.dst); 518 519 kfree(ifp); 520 } 521 522 static void 523 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 524 { 525 struct inet6_ifaddr *ifa, **ifap; 526 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 527 528 /* 529 * Each device address list is sorted in order of scope - 530 * global before linklocal. 531 */ 532 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 533 ifap = &ifa->if_next) { 534 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 535 break; 536 } 537 538 ifp->if_next = *ifap; 539 *ifap = ifp; 540 } 541 542 /* 543 * Hash function taken from net_alias.c 544 */ 545 static u8 ipv6_addr_hash(const struct in6_addr *addr) 546 { 547 __u32 word; 548 549 /* 550 * We perform the hash function over the last 64 bits of the address 551 * This will include the IEEE address token on links that support it. 552 */ 553 554 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 555 word ^= (word >> 16); 556 word ^= (word >> 8); 557 558 return ((word ^ (word >> 4)) & 0x0f); 559 } 560 561 /* On success it returns ifp with increased reference count */ 562 563 static struct inet6_ifaddr * 564 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 565 int scope, u32 flags) 566 { 567 struct inet6_ifaddr *ifa = NULL; 568 struct rt6_info *rt; 569 int hash; 570 int err = 0; 571 572 rcu_read_lock_bh(); 573 if (idev->dead) { 574 err = -ENODEV; /*XXX*/ 575 goto out2; 576 } 577 578 write_lock(&addrconf_hash_lock); 579 580 /* Ignore adding duplicate addresses on an interface */ 581 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 582 ADBG(("ipv6_add_addr: already assigned\n")); 583 err = -EEXIST; 584 goto out; 585 } 586 587 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 588 589 if (ifa == NULL) { 590 ADBG(("ipv6_add_addr: malloc failed\n")); 591 err = -ENOBUFS; 592 goto out; 593 } 594 595 rt = addrconf_dst_alloc(idev, addr, 0); 596 if (IS_ERR(rt)) { 597 err = PTR_ERR(rt); 598 goto out; 599 } 600 601 ipv6_addr_copy(&ifa->addr, addr); 602 603 spin_lock_init(&ifa->lock); 604 init_timer(&ifa->timer); 605 ifa->timer.data = (unsigned long) ifa; 606 ifa->scope = scope; 607 ifa->prefix_len = pfxlen; 608 ifa->flags = flags | IFA_F_TENTATIVE; 609 ifa->cstamp = ifa->tstamp = jiffies; 610 611 ifa->rt = rt; 612 613 /* 614 * part one of RFC 4429, section 3.3 615 * We should not configure an address as 616 * optimistic if we do not yet know the link 617 * layer address of our nexhop router 618 */ 619 620 if (rt->rt6i_nexthop == NULL) 621 ifa->flags &= ~IFA_F_OPTIMISTIC; 622 623 ifa->idev = idev; 624 in6_dev_hold(idev); 625 /* For caller */ 626 in6_ifa_hold(ifa); 627 628 /* Add to big hash table */ 629 hash = ipv6_addr_hash(addr); 630 631 ifa->lst_next = inet6_addr_lst[hash]; 632 inet6_addr_lst[hash] = ifa; 633 in6_ifa_hold(ifa); 634 write_unlock(&addrconf_hash_lock); 635 636 write_lock(&idev->lock); 637 /* Add to inet6_dev unicast addr list. */ 638 ipv6_link_dev_addr(idev, ifa); 639 640 #ifdef CONFIG_IPV6_PRIVACY 641 if (ifa->flags&IFA_F_TEMPORARY) { 642 ifa->tmp_next = idev->tempaddr_list; 643 idev->tempaddr_list = ifa; 644 in6_ifa_hold(ifa); 645 } 646 #endif 647 648 in6_ifa_hold(ifa); 649 write_unlock(&idev->lock); 650 out2: 651 rcu_read_unlock_bh(); 652 653 if (likely(err == 0)) 654 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 655 else { 656 kfree(ifa); 657 ifa = ERR_PTR(err); 658 } 659 660 return ifa; 661 out: 662 write_unlock(&addrconf_hash_lock); 663 goto out2; 664 } 665 666 /* This function wants to get referenced ifp and releases it before return */ 667 668 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 669 { 670 struct inet6_ifaddr *ifa, **ifap; 671 struct inet6_dev *idev = ifp->idev; 672 int hash; 673 int deleted = 0, onlink = 0; 674 unsigned long expires = jiffies; 675 676 hash = ipv6_addr_hash(&ifp->addr); 677 678 ifp->dead = 1; 679 680 write_lock_bh(&addrconf_hash_lock); 681 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 682 ifap = &ifa->lst_next) { 683 if (ifa == ifp) { 684 *ifap = ifa->lst_next; 685 __in6_ifa_put(ifp); 686 ifa->lst_next = NULL; 687 break; 688 } 689 } 690 write_unlock_bh(&addrconf_hash_lock); 691 692 write_lock_bh(&idev->lock); 693 #ifdef CONFIG_IPV6_PRIVACY 694 if (ifp->flags&IFA_F_TEMPORARY) { 695 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 696 ifap = &ifa->tmp_next) { 697 if (ifa == ifp) { 698 *ifap = ifa->tmp_next; 699 if (ifp->ifpub) { 700 in6_ifa_put(ifp->ifpub); 701 ifp->ifpub = NULL; 702 } 703 __in6_ifa_put(ifp); 704 ifa->tmp_next = NULL; 705 break; 706 } 707 } 708 } 709 #endif 710 711 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 712 if (ifa == ifp) { 713 *ifap = ifa->if_next; 714 __in6_ifa_put(ifp); 715 ifa->if_next = NULL; 716 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 717 break; 718 deleted = 1; 719 continue; 720 } else if (ifp->flags & IFA_F_PERMANENT) { 721 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 722 ifp->prefix_len)) { 723 if (ifa->flags & IFA_F_PERMANENT) { 724 onlink = 1; 725 if (deleted) 726 break; 727 } else { 728 unsigned long lifetime; 729 730 if (!onlink) 731 onlink = -1; 732 733 spin_lock(&ifa->lock); 734 735 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 736 /* 737 * Note: Because this address is 738 * not permanent, lifetime < 739 * LONG_MAX / HZ here. 740 */ 741 if (time_before(expires, 742 ifa->tstamp + lifetime * HZ)) 743 expires = ifa->tstamp + lifetime * HZ; 744 spin_unlock(&ifa->lock); 745 } 746 } 747 } 748 ifap = &ifa->if_next; 749 } 750 write_unlock_bh(&idev->lock); 751 752 ipv6_ifa_notify(RTM_DELADDR, ifp); 753 754 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 755 756 addrconf_del_timer(ifp); 757 758 /* 759 * Purge or update corresponding prefix 760 * 761 * 1) we don't purge prefix here if address was not permanent. 762 * prefix is managed by its own lifetime. 763 * 2) if there're no addresses, delete prefix. 764 * 3) if there're still other permanent address(es), 765 * corresponding prefix is still permanent. 766 * 4) otherwise, update prefix lifetime to the 767 * longest valid lifetime among the corresponding 768 * addresses on the device. 769 * Note: subsequent RA will update lifetime. 770 * 771 * --yoshfuji 772 */ 773 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 774 struct in6_addr prefix; 775 struct rt6_info *rt; 776 struct net *net = dev_net(ifp->idev->dev); 777 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 778 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 779 780 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 781 if (onlink == 0) { 782 ip6_del_rt(rt); 783 rt = NULL; 784 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 785 rt->rt6i_expires = expires; 786 rt->rt6i_flags |= RTF_EXPIRES; 787 } 788 } 789 dst_release(&rt->u.dst); 790 } 791 792 in6_ifa_put(ifp); 793 } 794 795 #ifdef CONFIG_IPV6_PRIVACY 796 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 797 { 798 struct inet6_dev *idev = ifp->idev; 799 struct in6_addr addr, *tmpaddr; 800 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 801 unsigned long regen_advance; 802 int tmp_plen; 803 int ret = 0; 804 int max_addresses; 805 u32 addr_flags; 806 807 write_lock(&idev->lock); 808 if (ift) { 809 spin_lock_bh(&ift->lock); 810 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 811 spin_unlock_bh(&ift->lock); 812 tmpaddr = &addr; 813 } else { 814 tmpaddr = NULL; 815 } 816 retry: 817 in6_dev_hold(idev); 818 if (idev->cnf.use_tempaddr <= 0) { 819 write_unlock(&idev->lock); 820 printk(KERN_INFO 821 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 822 in6_dev_put(idev); 823 ret = -1; 824 goto out; 825 } 826 spin_lock_bh(&ifp->lock); 827 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 828 idev->cnf.use_tempaddr = -1; /*XXX*/ 829 spin_unlock_bh(&ifp->lock); 830 write_unlock(&idev->lock); 831 printk(KERN_WARNING 832 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 833 in6_dev_put(idev); 834 ret = -1; 835 goto out; 836 } 837 in6_ifa_hold(ifp); 838 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 839 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 840 spin_unlock_bh(&ifp->lock); 841 write_unlock(&idev->lock); 842 printk(KERN_WARNING 843 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 844 in6_ifa_put(ifp); 845 in6_dev_put(idev); 846 ret = -1; 847 goto out; 848 } 849 memcpy(&addr.s6_addr[8], idev->rndid, 8); 850 tmp_valid_lft = min_t(__u32, 851 ifp->valid_lft, 852 idev->cnf.temp_valid_lft); 853 tmp_prefered_lft = min_t(__u32, 854 ifp->prefered_lft, 855 idev->cnf.temp_prefered_lft - desync_factor / HZ); 856 tmp_plen = ifp->prefix_len; 857 max_addresses = idev->cnf.max_addresses; 858 tmp_cstamp = ifp->cstamp; 859 tmp_tstamp = ifp->tstamp; 860 spin_unlock_bh(&ifp->lock); 861 862 regen_advance = idev->cnf.regen_max_retry * 863 idev->cnf.dad_transmits * 864 idev->nd_parms->retrans_time / HZ; 865 write_unlock(&idev->lock); 866 867 /* A temporary address is created only if this calculated Preferred 868 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 869 * an implementation must not create a temporary address with a zero 870 * Preferred Lifetime. 871 */ 872 if (tmp_prefered_lft <= regen_advance) { 873 in6_ifa_put(ifp); 874 in6_dev_put(idev); 875 ret = -1; 876 goto out; 877 } 878 879 addr_flags = IFA_F_TEMPORARY; 880 /* set in addrconf_prefix_rcv() */ 881 if (ifp->flags & IFA_F_OPTIMISTIC) 882 addr_flags |= IFA_F_OPTIMISTIC; 883 884 ift = !max_addresses || 885 ipv6_count_addresses(idev) < max_addresses ? 886 ipv6_add_addr(idev, &addr, tmp_plen, 887 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 888 addr_flags) : NULL; 889 if (!ift || IS_ERR(ift)) { 890 in6_ifa_put(ifp); 891 in6_dev_put(idev); 892 printk(KERN_INFO 893 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 894 tmpaddr = &addr; 895 write_lock(&idev->lock); 896 goto retry; 897 } 898 899 spin_lock_bh(&ift->lock); 900 ift->ifpub = ifp; 901 ift->valid_lft = tmp_valid_lft; 902 ift->prefered_lft = tmp_prefered_lft; 903 ift->cstamp = tmp_cstamp; 904 ift->tstamp = tmp_tstamp; 905 spin_unlock_bh(&ift->lock); 906 907 addrconf_dad_start(ift, 0); 908 in6_ifa_put(ift); 909 in6_dev_put(idev); 910 out: 911 return ret; 912 } 913 #endif 914 915 /* 916 * Choose an appropriate source address (RFC3484) 917 */ 918 enum { 919 IPV6_SADDR_RULE_INIT = 0, 920 IPV6_SADDR_RULE_LOCAL, 921 IPV6_SADDR_RULE_SCOPE, 922 IPV6_SADDR_RULE_PREFERRED, 923 #ifdef CONFIG_IPV6_MIP6 924 IPV6_SADDR_RULE_HOA, 925 #endif 926 IPV6_SADDR_RULE_OIF, 927 IPV6_SADDR_RULE_LABEL, 928 #ifdef CONFIG_IPV6_PRIVACY 929 IPV6_SADDR_RULE_PRIVACY, 930 #endif 931 IPV6_SADDR_RULE_ORCHID, 932 IPV6_SADDR_RULE_PREFIX, 933 IPV6_SADDR_RULE_MAX 934 }; 935 936 struct ipv6_saddr_score { 937 int rule; 938 int addr_type; 939 struct inet6_ifaddr *ifa; 940 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 941 int scopedist; 942 int matchlen; 943 }; 944 945 struct ipv6_saddr_dst { 946 const struct in6_addr *addr; 947 int ifindex; 948 int scope; 949 int label; 950 unsigned int prefs; 951 }; 952 953 static inline int ipv6_saddr_preferred(int type) 954 { 955 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 956 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 957 return 1; 958 return 0; 959 } 960 961 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score, 962 struct ipv6_saddr_dst *dst, 963 int i) 964 { 965 int ret; 966 967 if (i <= score->rule) { 968 switch (i) { 969 case IPV6_SADDR_RULE_SCOPE: 970 ret = score->scopedist; 971 break; 972 case IPV6_SADDR_RULE_PREFIX: 973 ret = score->matchlen; 974 break; 975 default: 976 ret = !!test_bit(i, score->scorebits); 977 } 978 goto out; 979 } 980 981 switch (i) { 982 case IPV6_SADDR_RULE_INIT: 983 /* Rule 0: remember if hiscore is not ready yet */ 984 ret = !!score->ifa; 985 break; 986 case IPV6_SADDR_RULE_LOCAL: 987 /* Rule 1: Prefer same address */ 988 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 989 break; 990 case IPV6_SADDR_RULE_SCOPE: 991 /* Rule 2: Prefer appropriate scope 992 * 993 * ret 994 * ^ 995 * -1 | d 15 996 * ---+--+-+---> scope 997 * | 998 * | d is scope of the destination. 999 * B-d | \ 1000 * | \ <- smaller scope is better if 1001 * B-15 | \ if scope is enough for destinaion. 1002 * | ret = B - scope (-1 <= scope >= d <= 15). 1003 * d-C-1 | / 1004 * |/ <- greater is better 1005 * -C / if scope is not enough for destination. 1006 * /| ret = scope - C (-1 <= d < scope <= 15). 1007 * 1008 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1009 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1010 * Assume B = 0 and we get C > 29. 1011 */ 1012 ret = __ipv6_addr_src_scope(score->addr_type); 1013 if (ret >= dst->scope) 1014 ret = -ret; 1015 else 1016 ret -= 128; /* 30 is enough */ 1017 score->scopedist = ret; 1018 break; 1019 case IPV6_SADDR_RULE_PREFERRED: 1020 /* Rule 3: Avoid deprecated and optimistic addresses */ 1021 ret = ipv6_saddr_preferred(score->addr_type) || 1022 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1023 break; 1024 #ifdef CONFIG_IPV6_MIP6 1025 case IPV6_SADDR_RULE_HOA: 1026 { 1027 /* Rule 4: Prefer home address */ 1028 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1029 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1030 break; 1031 } 1032 #endif 1033 case IPV6_SADDR_RULE_OIF: 1034 /* Rule 5: Prefer outgoing interface */ 1035 ret = (!dst->ifindex || 1036 dst->ifindex == score->ifa->idev->dev->ifindex); 1037 break; 1038 case IPV6_SADDR_RULE_LABEL: 1039 /* Rule 6: Prefer matching label */ 1040 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type, 1041 score->ifa->idev->dev->ifindex) == dst->label; 1042 break; 1043 #ifdef CONFIG_IPV6_PRIVACY 1044 case IPV6_SADDR_RULE_PRIVACY: 1045 { 1046 /* Rule 7: Prefer public address 1047 * Note: prefer temprary address if use_tempaddr >= 2 1048 */ 1049 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1050 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1051 score->ifa->idev->cnf.use_tempaddr >= 2; 1052 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1053 break; 1054 } 1055 #endif 1056 case IPV6_SADDR_RULE_ORCHID: 1057 /* Rule 8-: Prefer ORCHID vs ORCHID or 1058 * non-ORCHID vs non-ORCHID 1059 */ 1060 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1061 ipv6_addr_orchid(dst->addr)); 1062 break; 1063 case IPV6_SADDR_RULE_PREFIX: 1064 /* Rule 8: Use longest matching prefix */ 1065 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1066 dst->addr); 1067 break; 1068 default: 1069 ret = 0; 1070 } 1071 1072 if (ret) 1073 __set_bit(i, score->scorebits); 1074 score->rule = i; 1075 out: 1076 return ret; 1077 } 1078 1079 int ipv6_dev_get_saddr(struct net_device *dst_dev, 1080 const struct in6_addr *daddr, unsigned int prefs, 1081 struct in6_addr *saddr) 1082 { 1083 struct ipv6_saddr_score scores[2], 1084 *score = &scores[0], *hiscore = &scores[1]; 1085 struct net *net = dev_net(dst_dev); 1086 struct ipv6_saddr_dst dst; 1087 struct net_device *dev; 1088 int dst_type; 1089 1090 dst_type = __ipv6_addr_type(daddr); 1091 dst.addr = daddr; 1092 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1093 dst.scope = __ipv6_addr_src_scope(dst_type); 1094 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex); 1095 dst.prefs = prefs; 1096 1097 hiscore->rule = -1; 1098 hiscore->ifa = NULL; 1099 1100 read_lock(&dev_base_lock); 1101 rcu_read_lock(); 1102 1103 for_each_netdev(net, dev) { 1104 struct inet6_dev *idev; 1105 1106 /* Candidate Source Address (section 4) 1107 * - multicast and link-local destination address, 1108 * the set of candidate source address MUST only 1109 * include addresses assigned to interfaces 1110 * belonging to the same link as the outgoing 1111 * interface. 1112 * (- For site-local destination addresses, the 1113 * set of candidate source addresses MUST only 1114 * include addresses assigned to interfaces 1115 * belonging to the same site as the outgoing 1116 * interface.) 1117 */ 1118 if (((dst_type & IPV6_ADDR_MULTICAST) || 1119 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1120 dst.ifindex && dev->ifindex != dst.ifindex) 1121 continue; 1122 1123 idev = __in6_dev_get(dev); 1124 if (!idev) 1125 continue; 1126 1127 read_lock_bh(&idev->lock); 1128 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1129 int i; 1130 1131 /* 1132 * - Tentative Address (RFC2462 section 5.4) 1133 * - A tentative address is not considered 1134 * "assigned to an interface" in the traditional 1135 * sense, unless it is also flagged as optimistic. 1136 * - Candidate Source Address (section 4) 1137 * - In any case, anycast addresses, multicast 1138 * addresses, and the unspecified address MUST 1139 * NOT be included in a candidate set. 1140 */ 1141 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1142 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1143 continue; 1144 1145 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1146 1147 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1148 score->addr_type & IPV6_ADDR_MULTICAST)) { 1149 LIMIT_NETDEBUG(KERN_DEBUG 1150 "ADDRCONF: unspecified / multicast address " 1151 "assigned as unicast address on %s", 1152 dev->name); 1153 continue; 1154 } 1155 1156 score->rule = -1; 1157 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1158 1159 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1160 int minihiscore, miniscore; 1161 1162 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i); 1163 miniscore = ipv6_get_saddr_eval(score, &dst, i); 1164 1165 if (minihiscore > miniscore) { 1166 if (i == IPV6_SADDR_RULE_SCOPE && 1167 score->scopedist > 0) { 1168 /* 1169 * special case: 1170 * each remaining entry 1171 * has too small (not enough) 1172 * scope, because ifa entries 1173 * are sorted by their scope 1174 * values. 1175 */ 1176 goto try_nextdev; 1177 } 1178 break; 1179 } else if (minihiscore < miniscore) { 1180 struct ipv6_saddr_score *tmp; 1181 1182 if (hiscore->ifa) 1183 in6_ifa_put(hiscore->ifa); 1184 1185 in6_ifa_hold(score->ifa); 1186 1187 tmp = hiscore; 1188 hiscore = score; 1189 score = tmp; 1190 1191 /* restore our iterator */ 1192 score->ifa = hiscore->ifa; 1193 1194 break; 1195 } 1196 } 1197 } 1198 try_nextdev: 1199 read_unlock_bh(&idev->lock); 1200 } 1201 rcu_read_unlock(); 1202 read_unlock(&dev_base_lock); 1203 1204 if (!hiscore->ifa) 1205 return -EADDRNOTAVAIL; 1206 1207 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1208 in6_ifa_put(hiscore->ifa); 1209 return 0; 1210 } 1211 1212 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1213 1214 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1215 unsigned char banned_flags) 1216 { 1217 struct inet6_dev *idev; 1218 int err = -EADDRNOTAVAIL; 1219 1220 rcu_read_lock(); 1221 if ((idev = __in6_dev_get(dev)) != NULL) { 1222 struct inet6_ifaddr *ifp; 1223 1224 read_lock_bh(&idev->lock); 1225 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1226 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1227 ipv6_addr_copy(addr, &ifp->addr); 1228 err = 0; 1229 break; 1230 } 1231 } 1232 read_unlock_bh(&idev->lock); 1233 } 1234 rcu_read_unlock(); 1235 return err; 1236 } 1237 1238 static int ipv6_count_addresses(struct inet6_dev *idev) 1239 { 1240 int cnt = 0; 1241 struct inet6_ifaddr *ifp; 1242 1243 read_lock_bh(&idev->lock); 1244 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1245 cnt++; 1246 read_unlock_bh(&idev->lock); 1247 return cnt; 1248 } 1249 1250 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1251 struct net_device *dev, int strict) 1252 { 1253 struct inet6_ifaddr * ifp; 1254 u8 hash = ipv6_addr_hash(addr); 1255 1256 read_lock_bh(&addrconf_hash_lock); 1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1258 if (!net_eq(dev_net(ifp->idev->dev), net)) 1259 continue; 1260 if (ipv6_addr_equal(&ifp->addr, addr) && 1261 !(ifp->flags&IFA_F_TENTATIVE)) { 1262 if (dev == NULL || ifp->idev->dev == dev || 1263 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1264 break; 1265 } 1266 } 1267 read_unlock_bh(&addrconf_hash_lock); 1268 return ifp != NULL; 1269 } 1270 EXPORT_SYMBOL(ipv6_chk_addr); 1271 1272 static 1273 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1274 struct net_device *dev) 1275 { 1276 struct inet6_ifaddr * ifp; 1277 u8 hash = ipv6_addr_hash(addr); 1278 1279 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1280 if (!net_eq(dev_net(ifp->idev->dev), net)) 1281 continue; 1282 if (ipv6_addr_equal(&ifp->addr, addr)) { 1283 if (dev == NULL || ifp->idev->dev == dev) 1284 break; 1285 } 1286 } 1287 return ifp != NULL; 1288 } 1289 1290 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1291 { 1292 struct inet6_dev *idev; 1293 struct inet6_ifaddr *ifa; 1294 int onlink; 1295 1296 onlink = 0; 1297 rcu_read_lock(); 1298 idev = __in6_dev_get(dev); 1299 if (idev) { 1300 read_lock_bh(&idev->lock); 1301 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1302 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1303 ifa->prefix_len); 1304 if (onlink) 1305 break; 1306 } 1307 read_unlock_bh(&idev->lock); 1308 } 1309 rcu_read_unlock(); 1310 return onlink; 1311 } 1312 1313 EXPORT_SYMBOL(ipv6_chk_prefix); 1314 1315 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1316 struct net_device *dev, int strict) 1317 { 1318 struct inet6_ifaddr * ifp; 1319 u8 hash = ipv6_addr_hash(addr); 1320 1321 read_lock_bh(&addrconf_hash_lock); 1322 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1323 if (!net_eq(dev_net(ifp->idev->dev), net)) 1324 continue; 1325 if (ipv6_addr_equal(&ifp->addr, addr)) { 1326 if (dev == NULL || ifp->idev->dev == dev || 1327 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1328 in6_ifa_hold(ifp); 1329 break; 1330 } 1331 } 1332 } 1333 read_unlock_bh(&addrconf_hash_lock); 1334 1335 return ifp; 1336 } 1337 1338 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1339 { 1340 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1341 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1342 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1343 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1344 int sk_ipv6only = ipv6_only_sock(sk); 1345 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1346 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1347 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1348 1349 if (!sk2_rcv_saddr && !sk_ipv6only) 1350 return 1; 1351 1352 if (addr_type2 == IPV6_ADDR_ANY && 1353 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1354 return 1; 1355 1356 if (addr_type == IPV6_ADDR_ANY && 1357 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1358 return 1; 1359 1360 if (sk2_rcv_saddr6 && 1361 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1362 return 1; 1363 1364 if (addr_type == IPV6_ADDR_MAPPED && 1365 !sk2_ipv6only && 1366 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1367 return 1; 1368 1369 return 0; 1370 } 1371 1372 /* Gets referenced address, destroys ifaddr */ 1373 1374 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 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 spin_unlock_bh(&ifp->lock); 1381 in6_ifa_put(ifp); 1382 #ifdef CONFIG_IPV6_PRIVACY 1383 } else if (ifp->flags&IFA_F_TEMPORARY) { 1384 struct inet6_ifaddr *ifpub; 1385 spin_lock_bh(&ifp->lock); 1386 ifpub = ifp->ifpub; 1387 if (ifpub) { 1388 in6_ifa_hold(ifpub); 1389 spin_unlock_bh(&ifp->lock); 1390 ipv6_create_tempaddr(ifpub, ifp); 1391 in6_ifa_put(ifpub); 1392 } else { 1393 spin_unlock_bh(&ifp->lock); 1394 } 1395 ipv6_del_addr(ifp); 1396 #endif 1397 } else 1398 ipv6_del_addr(ifp); 1399 } 1400 1401 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1402 { 1403 if (net_ratelimit()) 1404 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1405 addrconf_dad_stop(ifp); 1406 } 1407 1408 /* Join to solicited addr multicast group. */ 1409 1410 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1411 { 1412 struct in6_addr maddr; 1413 1414 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1415 return; 1416 1417 addrconf_addr_solict_mult(addr, &maddr); 1418 ipv6_dev_mc_inc(dev, &maddr); 1419 } 1420 1421 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1422 { 1423 struct in6_addr maddr; 1424 1425 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1426 return; 1427 1428 addrconf_addr_solict_mult(addr, &maddr); 1429 __ipv6_dev_mc_dec(idev, &maddr); 1430 } 1431 1432 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1433 { 1434 struct in6_addr addr; 1435 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1436 if (ipv6_addr_any(&addr)) 1437 return; 1438 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1439 } 1440 1441 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1442 { 1443 struct in6_addr addr; 1444 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1445 if (ipv6_addr_any(&addr)) 1446 return; 1447 __ipv6_dev_ac_dec(ifp->idev, &addr); 1448 } 1449 1450 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1451 { 1452 if (dev->addr_len != ETH_ALEN) 1453 return -1; 1454 memcpy(eui, dev->dev_addr, 3); 1455 memcpy(eui + 5, dev->dev_addr + 3, 3); 1456 1457 /* 1458 * The zSeries OSA network cards can be shared among various 1459 * OS instances, but the OSA cards have only one MAC address. 1460 * This leads to duplicate address conflicts in conjunction 1461 * with IPv6 if more than one instance uses the same card. 1462 * 1463 * The driver for these cards can deliver a unique 16-bit 1464 * identifier for each instance sharing the same card. It is 1465 * placed instead of 0xFFFE in the interface identifier. The 1466 * "u" bit of the interface identifier is not inverted in this 1467 * case. Hence the resulting interface identifier has local 1468 * scope according to RFC2373. 1469 */ 1470 if (dev->dev_id) { 1471 eui[3] = (dev->dev_id >> 8) & 0xFF; 1472 eui[4] = dev->dev_id & 0xFF; 1473 } else { 1474 eui[3] = 0xFF; 1475 eui[4] = 0xFE; 1476 eui[0] ^= 2; 1477 } 1478 return 0; 1479 } 1480 1481 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1482 { 1483 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1484 if (dev->addr_len != ARCNET_ALEN) 1485 return -1; 1486 memset(eui, 0, 7); 1487 eui[7] = *(u8*)dev->dev_addr; 1488 return 0; 1489 } 1490 1491 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1492 { 1493 if (dev->addr_len != INFINIBAND_ALEN) 1494 return -1; 1495 memcpy(eui, dev->dev_addr + 12, 8); 1496 eui[0] |= 2; 1497 return 0; 1498 } 1499 1500 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1501 { 1502 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1503 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1504 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1505 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1506 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1507 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1508 eui[1] = 0; 1509 eui[2] = 0x5E; 1510 eui[3] = 0xFE; 1511 memcpy(eui + 4, &addr, 4); 1512 return 0; 1513 } 1514 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1515 1516 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1517 { 1518 if (dev->priv_flags & IFF_ISATAP) 1519 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1520 return -1; 1521 } 1522 1523 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1524 { 1525 switch (dev->type) { 1526 case ARPHRD_ETHER: 1527 case ARPHRD_FDDI: 1528 case ARPHRD_IEEE802_TR: 1529 return addrconf_ifid_eui48(eui, dev); 1530 case ARPHRD_ARCNET: 1531 return addrconf_ifid_arcnet(eui, dev); 1532 case ARPHRD_INFINIBAND: 1533 return addrconf_ifid_infiniband(eui, dev); 1534 case ARPHRD_SIT: 1535 return addrconf_ifid_sit(eui, dev); 1536 } 1537 return -1; 1538 } 1539 1540 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1541 { 1542 int err = -1; 1543 struct inet6_ifaddr *ifp; 1544 1545 read_lock_bh(&idev->lock); 1546 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1547 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1548 memcpy(eui, ifp->addr.s6_addr+8, 8); 1549 err = 0; 1550 break; 1551 } 1552 } 1553 read_unlock_bh(&idev->lock); 1554 return err; 1555 } 1556 1557 #ifdef CONFIG_IPV6_PRIVACY 1558 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1559 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1560 { 1561 regen: 1562 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1563 idev->rndid[0] &= ~0x02; 1564 1565 /* 1566 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1567 * check if generated address is not inappropriate 1568 * 1569 * - Reserved subnet anycast (RFC 2526) 1570 * 11111101 11....11 1xxxxxxx 1571 * - ISATAP (RFC4214) 6.1 1572 * 00-00-5E-FE-xx-xx-xx-xx 1573 * - value 0 1574 * - XXX: already assigned to an address on the device 1575 */ 1576 if (idev->rndid[0] == 0xfd && 1577 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1578 (idev->rndid[7]&0x80)) 1579 goto regen; 1580 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1581 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1582 goto regen; 1583 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1584 goto regen; 1585 } 1586 1587 return 0; 1588 } 1589 1590 static void ipv6_regen_rndid(unsigned long data) 1591 { 1592 struct inet6_dev *idev = (struct inet6_dev *) data; 1593 unsigned long expires; 1594 1595 rcu_read_lock_bh(); 1596 write_lock_bh(&idev->lock); 1597 1598 if (idev->dead) 1599 goto out; 1600 1601 if (__ipv6_regen_rndid(idev) < 0) 1602 goto out; 1603 1604 expires = jiffies + 1605 idev->cnf.temp_prefered_lft * HZ - 1606 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1607 if (time_before(expires, jiffies)) { 1608 printk(KERN_WARNING 1609 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1610 idev->dev->name); 1611 goto out; 1612 } 1613 1614 if (!mod_timer(&idev->regen_timer, expires)) 1615 in6_dev_hold(idev); 1616 1617 out: 1618 write_unlock_bh(&idev->lock); 1619 rcu_read_unlock_bh(); 1620 in6_dev_put(idev); 1621 } 1622 1623 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1624 int ret = 0; 1625 1626 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1627 ret = __ipv6_regen_rndid(idev); 1628 return ret; 1629 } 1630 #endif 1631 1632 /* 1633 * Add prefix route. 1634 */ 1635 1636 static void 1637 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1638 unsigned long expires, u32 flags) 1639 { 1640 struct fib6_config cfg = { 1641 .fc_table = RT6_TABLE_PREFIX, 1642 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1643 .fc_ifindex = dev->ifindex, 1644 .fc_expires = expires, 1645 .fc_dst_len = plen, 1646 .fc_flags = RTF_UP | flags, 1647 .fc_nlinfo.nl_net = dev_net(dev), 1648 }; 1649 1650 ipv6_addr_copy(&cfg.fc_dst, pfx); 1651 1652 /* Prevent useless cloning on PtP SIT. 1653 This thing is done here expecting that the whole 1654 class of non-broadcast devices need not cloning. 1655 */ 1656 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1657 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1658 cfg.fc_flags |= RTF_NONEXTHOP; 1659 #endif 1660 1661 ip6_route_add(&cfg); 1662 } 1663 1664 /* Create "default" multicast route to the interface */ 1665 1666 static void addrconf_add_mroute(struct net_device *dev) 1667 { 1668 struct fib6_config cfg = { 1669 .fc_table = RT6_TABLE_LOCAL, 1670 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1671 .fc_ifindex = dev->ifindex, 1672 .fc_dst_len = 8, 1673 .fc_flags = RTF_UP, 1674 .fc_nlinfo.nl_net = dev_net(dev), 1675 }; 1676 1677 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1678 1679 ip6_route_add(&cfg); 1680 } 1681 1682 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1683 static void sit_route_add(struct net_device *dev) 1684 { 1685 struct fib6_config cfg = { 1686 .fc_table = RT6_TABLE_MAIN, 1687 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1688 .fc_ifindex = dev->ifindex, 1689 .fc_dst_len = 96, 1690 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1691 .fc_nlinfo.nl_net = dev_net(dev), 1692 }; 1693 1694 /* prefix length - 96 bits "::d.d.d.d" */ 1695 ip6_route_add(&cfg); 1696 } 1697 #endif 1698 1699 static void addrconf_add_lroute(struct net_device *dev) 1700 { 1701 struct in6_addr addr; 1702 1703 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1704 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1705 } 1706 1707 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1708 { 1709 struct inet6_dev *idev; 1710 1711 ASSERT_RTNL(); 1712 1713 if ((idev = ipv6_find_idev(dev)) == NULL) 1714 return NULL; 1715 1716 /* Add default multicast route */ 1717 addrconf_add_mroute(dev); 1718 1719 /* Add link local route */ 1720 addrconf_add_lroute(dev); 1721 return idev; 1722 } 1723 1724 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1725 { 1726 struct prefix_info *pinfo; 1727 __u32 valid_lft; 1728 __u32 prefered_lft; 1729 int addr_type; 1730 struct inet6_dev *in6_dev; 1731 1732 pinfo = (struct prefix_info *) opt; 1733 1734 if (len < sizeof(struct prefix_info)) { 1735 ADBG(("addrconf: prefix option too short\n")); 1736 return; 1737 } 1738 1739 /* 1740 * Validation checks ([ADDRCONF], page 19) 1741 */ 1742 1743 addr_type = ipv6_addr_type(&pinfo->prefix); 1744 1745 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1746 return; 1747 1748 valid_lft = ntohl(pinfo->valid); 1749 prefered_lft = ntohl(pinfo->prefered); 1750 1751 if (prefered_lft > valid_lft) { 1752 if (net_ratelimit()) 1753 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1754 return; 1755 } 1756 1757 in6_dev = in6_dev_get(dev); 1758 1759 if (in6_dev == NULL) { 1760 if (net_ratelimit()) 1761 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1762 return; 1763 } 1764 1765 /* 1766 * Two things going on here: 1767 * 1) Add routes for on-link prefixes 1768 * 2) Configure prefixes with the auto flag set 1769 */ 1770 1771 if (pinfo->onlink) { 1772 struct rt6_info *rt; 1773 unsigned long rt_expires; 1774 1775 /* Avoid arithmetic overflow. Really, we could 1776 * save rt_expires in seconds, likely valid_lft, 1777 * but it would require division in fib gc, that it 1778 * not good. 1779 */ 1780 if (HZ > USER_HZ) 1781 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1782 else 1783 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1784 1785 if (addrconf_finite_timeout(rt_expires)) 1786 rt_expires *= HZ; 1787 1788 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL, 1789 dev->ifindex, 1); 1790 1791 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1792 /* Autoconf prefix route */ 1793 if (valid_lft == 0) { 1794 ip6_del_rt(rt); 1795 rt = NULL; 1796 } else if (addrconf_finite_timeout(rt_expires)) { 1797 /* not infinity */ 1798 rt->rt6i_expires = jiffies + rt_expires; 1799 rt->rt6i_flags |= RTF_EXPIRES; 1800 } else { 1801 rt->rt6i_flags &= ~RTF_EXPIRES; 1802 rt->rt6i_expires = 0; 1803 } 1804 } else if (valid_lft) { 1805 clock_t expires = 0; 1806 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1807 if (addrconf_finite_timeout(rt_expires)) { 1808 /* not infinity */ 1809 flags |= RTF_EXPIRES; 1810 expires = jiffies_to_clock_t(rt_expires); 1811 } 1812 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1813 dev, expires, flags); 1814 } 1815 if (rt) 1816 dst_release(&rt->u.dst); 1817 } 1818 1819 /* Try to figure out our local address for this prefix */ 1820 1821 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1822 struct inet6_ifaddr * ifp; 1823 struct in6_addr addr; 1824 int create = 0, update_lft = 0; 1825 1826 if (pinfo->prefix_len == 64) { 1827 memcpy(&addr, &pinfo->prefix, 8); 1828 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1829 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1830 in6_dev_put(in6_dev); 1831 return; 1832 } 1833 goto ok; 1834 } 1835 if (net_ratelimit()) 1836 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1837 pinfo->prefix_len); 1838 in6_dev_put(in6_dev); 1839 return; 1840 1841 ok: 1842 1843 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1); 1844 1845 if (ifp == NULL && valid_lft) { 1846 int max_addresses = in6_dev->cnf.max_addresses; 1847 u32 addr_flags = 0; 1848 1849 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1850 if (in6_dev->cnf.optimistic_dad && 1851 !ipv6_devconf.forwarding) 1852 addr_flags = IFA_F_OPTIMISTIC; 1853 #endif 1854 1855 /* Do not allow to create too much of autoconfigured 1856 * addresses; this would be too easy way to crash kernel. 1857 */ 1858 if (!max_addresses || 1859 ipv6_count_addresses(in6_dev) < max_addresses) 1860 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1861 addr_type&IPV6_ADDR_SCOPE_MASK, 1862 addr_flags); 1863 1864 if (!ifp || IS_ERR(ifp)) { 1865 in6_dev_put(in6_dev); 1866 return; 1867 } 1868 1869 update_lft = create = 1; 1870 ifp->cstamp = jiffies; 1871 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1872 } 1873 1874 if (ifp) { 1875 int flags; 1876 unsigned long now; 1877 #ifdef CONFIG_IPV6_PRIVACY 1878 struct inet6_ifaddr *ift; 1879 #endif 1880 u32 stored_lft; 1881 1882 /* update lifetime (RFC2462 5.5.3 e) */ 1883 spin_lock(&ifp->lock); 1884 now = jiffies; 1885 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1886 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1887 else 1888 stored_lft = 0; 1889 if (!update_lft && stored_lft) { 1890 if (valid_lft > MIN_VALID_LIFETIME || 1891 valid_lft > stored_lft) 1892 update_lft = 1; 1893 else if (stored_lft <= MIN_VALID_LIFETIME) { 1894 /* valid_lft <= stored_lft is always true */ 1895 /* XXX: IPsec */ 1896 update_lft = 0; 1897 } else { 1898 valid_lft = MIN_VALID_LIFETIME; 1899 if (valid_lft < prefered_lft) 1900 prefered_lft = valid_lft; 1901 update_lft = 1; 1902 } 1903 } 1904 1905 if (update_lft) { 1906 ifp->valid_lft = valid_lft; 1907 ifp->prefered_lft = prefered_lft; 1908 ifp->tstamp = now; 1909 flags = ifp->flags; 1910 ifp->flags &= ~IFA_F_DEPRECATED; 1911 spin_unlock(&ifp->lock); 1912 1913 if (!(flags&IFA_F_TENTATIVE)) 1914 ipv6_ifa_notify(0, ifp); 1915 } else 1916 spin_unlock(&ifp->lock); 1917 1918 #ifdef CONFIG_IPV6_PRIVACY 1919 read_lock_bh(&in6_dev->lock); 1920 /* update all temporary addresses in the list */ 1921 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1922 /* 1923 * When adjusting the lifetimes of an existing 1924 * temporary address, only lower the lifetimes. 1925 * Implementations must not increase the 1926 * lifetimes of an existing temporary address 1927 * when processing a Prefix Information Option. 1928 */ 1929 if (ifp != ift->ifpub) 1930 continue; 1931 1932 spin_lock(&ift->lock); 1933 flags = ift->flags; 1934 if (ift->valid_lft > valid_lft && 1935 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1936 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1937 if (ift->prefered_lft > prefered_lft && 1938 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1939 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1940 spin_unlock(&ift->lock); 1941 if (!(flags&IFA_F_TENTATIVE)) 1942 ipv6_ifa_notify(0, ift); 1943 } 1944 1945 if (create && in6_dev->cnf.use_tempaddr > 0) { 1946 /* 1947 * When a new public address is created as described in [ADDRCONF], 1948 * also create a new temporary address. 1949 */ 1950 read_unlock_bh(&in6_dev->lock); 1951 ipv6_create_tempaddr(ifp, NULL); 1952 } else { 1953 read_unlock_bh(&in6_dev->lock); 1954 } 1955 #endif 1956 in6_ifa_put(ifp); 1957 addrconf_verify(0); 1958 } 1959 } 1960 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1961 in6_dev_put(in6_dev); 1962 } 1963 1964 /* 1965 * Set destination address. 1966 * Special case for SIT interfaces where we create a new "virtual" 1967 * device. 1968 */ 1969 int addrconf_set_dstaddr(struct net *net, void __user *arg) 1970 { 1971 struct in6_ifreq ireq; 1972 struct net_device *dev; 1973 int err = -EINVAL; 1974 1975 rtnl_lock(); 1976 1977 err = -EFAULT; 1978 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1979 goto err_exit; 1980 1981 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 1982 1983 err = -ENODEV; 1984 if (dev == NULL) 1985 goto err_exit; 1986 1987 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1988 if (dev->type == ARPHRD_SIT) { 1989 struct ifreq ifr; 1990 mm_segment_t oldfs; 1991 struct ip_tunnel_parm p; 1992 1993 err = -EADDRNOTAVAIL; 1994 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1995 goto err_exit; 1996 1997 memset(&p, 0, sizeof(p)); 1998 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1999 p.iph.saddr = 0; 2000 p.iph.version = 4; 2001 p.iph.ihl = 5; 2002 p.iph.protocol = IPPROTO_IPV6; 2003 p.iph.ttl = 64; 2004 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2005 2006 oldfs = get_fs(); set_fs(KERNEL_DS); 2007 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2008 set_fs(oldfs); 2009 2010 if (err == 0) { 2011 err = -ENOBUFS; 2012 dev = __dev_get_by_name(net, p.name); 2013 if (!dev) 2014 goto err_exit; 2015 err = dev_open(dev); 2016 } 2017 } 2018 #endif 2019 2020 err_exit: 2021 rtnl_unlock(); 2022 return err; 2023 } 2024 2025 /* 2026 * Manual configuration of address on an interface 2027 */ 2028 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2029 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2030 __u32 valid_lft) 2031 { 2032 struct inet6_ifaddr *ifp; 2033 struct inet6_dev *idev; 2034 struct net_device *dev; 2035 int scope; 2036 u32 flags; 2037 clock_t expires; 2038 unsigned long timeout; 2039 2040 ASSERT_RTNL(); 2041 2042 if (plen > 128) 2043 return -EINVAL; 2044 2045 /* check the lifetime */ 2046 if (!valid_lft || prefered_lft > valid_lft) 2047 return -EINVAL; 2048 2049 dev = __dev_get_by_index(net, ifindex); 2050 if (!dev) 2051 return -ENODEV; 2052 2053 if ((idev = addrconf_add_dev(dev)) == NULL) 2054 return -ENOBUFS; 2055 2056 scope = ipv6_addr_scope(pfx); 2057 2058 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2059 if (addrconf_finite_timeout(timeout)) { 2060 expires = jiffies_to_clock_t(timeout * HZ); 2061 valid_lft = timeout; 2062 flags = RTF_EXPIRES; 2063 } else { 2064 expires = 0; 2065 flags = 0; 2066 ifa_flags |= IFA_F_PERMANENT; 2067 } 2068 2069 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2070 if (addrconf_finite_timeout(timeout)) { 2071 if (timeout == 0) 2072 ifa_flags |= IFA_F_DEPRECATED; 2073 prefered_lft = timeout; 2074 } 2075 2076 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2077 2078 if (!IS_ERR(ifp)) { 2079 spin_lock_bh(&ifp->lock); 2080 ifp->valid_lft = valid_lft; 2081 ifp->prefered_lft = prefered_lft; 2082 ifp->tstamp = jiffies; 2083 spin_unlock_bh(&ifp->lock); 2084 2085 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2086 expires, flags); 2087 /* 2088 * Note that section 3.1 of RFC 4429 indicates 2089 * that the Optimistic flag should not be set for 2090 * manually configured addresses 2091 */ 2092 addrconf_dad_start(ifp, 0); 2093 in6_ifa_put(ifp); 2094 addrconf_verify(0); 2095 return 0; 2096 } 2097 2098 return PTR_ERR(ifp); 2099 } 2100 2101 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2102 unsigned int plen) 2103 { 2104 struct inet6_ifaddr *ifp; 2105 struct inet6_dev *idev; 2106 struct net_device *dev; 2107 2108 if (plen > 128) 2109 return -EINVAL; 2110 2111 dev = __dev_get_by_index(net, ifindex); 2112 if (!dev) 2113 return -ENODEV; 2114 2115 if ((idev = __in6_dev_get(dev)) == NULL) 2116 return -ENXIO; 2117 2118 read_lock_bh(&idev->lock); 2119 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2120 if (ifp->prefix_len == plen && 2121 ipv6_addr_equal(pfx, &ifp->addr)) { 2122 in6_ifa_hold(ifp); 2123 read_unlock_bh(&idev->lock); 2124 2125 ipv6_del_addr(ifp); 2126 2127 /* If the last address is deleted administratively, 2128 disable IPv6 on this interface. 2129 */ 2130 if (idev->addr_list == NULL) 2131 addrconf_ifdown(idev->dev, 1); 2132 return 0; 2133 } 2134 } 2135 read_unlock_bh(&idev->lock); 2136 return -EADDRNOTAVAIL; 2137 } 2138 2139 2140 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2141 { 2142 struct in6_ifreq ireq; 2143 int err; 2144 2145 if (!capable(CAP_NET_ADMIN)) 2146 return -EPERM; 2147 2148 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2149 return -EFAULT; 2150 2151 rtnl_lock(); 2152 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2153 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2154 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2155 rtnl_unlock(); 2156 return err; 2157 } 2158 2159 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2160 { 2161 struct in6_ifreq ireq; 2162 int err; 2163 2164 if (!capable(CAP_NET_ADMIN)) 2165 return -EPERM; 2166 2167 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2168 return -EFAULT; 2169 2170 rtnl_lock(); 2171 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2172 ireq.ifr6_prefixlen); 2173 rtnl_unlock(); 2174 return err; 2175 } 2176 2177 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2178 static void sit_add_v4_addrs(struct inet6_dev *idev) 2179 { 2180 struct inet6_ifaddr * ifp; 2181 struct in6_addr addr; 2182 struct net_device *dev; 2183 struct net *net = dev_net(idev->dev); 2184 int scope; 2185 2186 ASSERT_RTNL(); 2187 2188 memset(&addr, 0, sizeof(struct in6_addr)); 2189 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2190 2191 if (idev->dev->flags&IFF_POINTOPOINT) { 2192 addr.s6_addr32[0] = htonl(0xfe800000); 2193 scope = IFA_LINK; 2194 } else { 2195 scope = IPV6_ADDR_COMPATv4; 2196 } 2197 2198 if (addr.s6_addr32[3]) { 2199 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2200 if (!IS_ERR(ifp)) { 2201 spin_lock_bh(&ifp->lock); 2202 ifp->flags &= ~IFA_F_TENTATIVE; 2203 spin_unlock_bh(&ifp->lock); 2204 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2205 in6_ifa_put(ifp); 2206 } 2207 return; 2208 } 2209 2210 for_each_netdev(net, dev) { 2211 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2212 if (in_dev && (dev->flags & IFF_UP)) { 2213 struct in_ifaddr * ifa; 2214 2215 int flag = scope; 2216 2217 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2218 int plen; 2219 2220 addr.s6_addr32[3] = ifa->ifa_local; 2221 2222 if (ifa->ifa_scope == RT_SCOPE_LINK) 2223 continue; 2224 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2225 if (idev->dev->flags&IFF_POINTOPOINT) 2226 continue; 2227 flag |= IFA_HOST; 2228 } 2229 if (idev->dev->flags&IFF_POINTOPOINT) 2230 plen = 64; 2231 else 2232 plen = 96; 2233 2234 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2235 IFA_F_PERMANENT); 2236 if (!IS_ERR(ifp)) { 2237 spin_lock_bh(&ifp->lock); 2238 ifp->flags &= ~IFA_F_TENTATIVE; 2239 spin_unlock_bh(&ifp->lock); 2240 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2241 in6_ifa_put(ifp); 2242 } 2243 } 2244 } 2245 } 2246 } 2247 #endif 2248 2249 static void init_loopback(struct net_device *dev) 2250 { 2251 struct inet6_dev *idev; 2252 struct inet6_ifaddr * ifp; 2253 2254 /* ::1 */ 2255 2256 ASSERT_RTNL(); 2257 2258 if ((idev = ipv6_find_idev(dev)) == NULL) { 2259 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2260 return; 2261 } 2262 2263 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2264 if (!IS_ERR(ifp)) { 2265 spin_lock_bh(&ifp->lock); 2266 ifp->flags &= ~IFA_F_TENTATIVE; 2267 spin_unlock_bh(&ifp->lock); 2268 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2269 in6_ifa_put(ifp); 2270 } 2271 } 2272 2273 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2274 { 2275 struct inet6_ifaddr * ifp; 2276 u32 addr_flags = IFA_F_PERMANENT; 2277 2278 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2279 if (idev->cnf.optimistic_dad && 2280 !ipv6_devconf.forwarding) 2281 addr_flags |= IFA_F_OPTIMISTIC; 2282 #endif 2283 2284 2285 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2286 if (!IS_ERR(ifp)) { 2287 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2288 addrconf_dad_start(ifp, 0); 2289 in6_ifa_put(ifp); 2290 } 2291 } 2292 2293 static void addrconf_dev_config(struct net_device *dev) 2294 { 2295 struct in6_addr addr; 2296 struct inet6_dev * idev; 2297 2298 ASSERT_RTNL(); 2299 2300 if ((dev->type != ARPHRD_ETHER) && 2301 (dev->type != ARPHRD_FDDI) && 2302 (dev->type != ARPHRD_IEEE802_TR) && 2303 (dev->type != ARPHRD_ARCNET) && 2304 (dev->type != ARPHRD_INFINIBAND)) { 2305 /* Alas, we support only Ethernet autoconfiguration. */ 2306 return; 2307 } 2308 2309 idev = addrconf_add_dev(dev); 2310 if (idev == NULL) 2311 return; 2312 2313 memset(&addr, 0, sizeof(struct in6_addr)); 2314 addr.s6_addr32[0] = htonl(0xFE800000); 2315 2316 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2317 addrconf_add_linklocal(idev, &addr); 2318 } 2319 2320 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2321 static void addrconf_sit_config(struct net_device *dev) 2322 { 2323 struct inet6_dev *idev; 2324 2325 ASSERT_RTNL(); 2326 2327 /* 2328 * Configure the tunnel with one of our IPv4 2329 * addresses... we should configure all of 2330 * our v4 addrs in the tunnel 2331 */ 2332 2333 if ((idev = ipv6_find_idev(dev)) == NULL) { 2334 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2335 return; 2336 } 2337 2338 if (dev->priv_flags & IFF_ISATAP) { 2339 struct in6_addr addr; 2340 2341 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2342 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2343 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2344 addrconf_add_linklocal(idev, &addr); 2345 return; 2346 } 2347 2348 sit_add_v4_addrs(idev); 2349 2350 if (dev->flags&IFF_POINTOPOINT) { 2351 addrconf_add_mroute(dev); 2352 addrconf_add_lroute(dev); 2353 } else 2354 sit_route_add(dev); 2355 } 2356 #endif 2357 2358 static inline int 2359 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2360 { 2361 struct in6_addr lladdr; 2362 2363 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2364 addrconf_add_linklocal(idev, &lladdr); 2365 return 0; 2366 } 2367 return -1; 2368 } 2369 2370 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2371 { 2372 struct net_device *link_dev; 2373 struct net *net = dev_net(idev->dev); 2374 2375 /* first try to inherit the link-local address from the link device */ 2376 if (idev->dev->iflink && 2377 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2378 if (!ipv6_inherit_linklocal(idev, link_dev)) 2379 return; 2380 } 2381 /* then try to inherit it from any device */ 2382 for_each_netdev(net, link_dev) { 2383 if (!ipv6_inherit_linklocal(idev, link_dev)) 2384 return; 2385 } 2386 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2387 } 2388 2389 /* 2390 * Autoconfigure tunnel with a link-local address so routing protocols, 2391 * DHCPv6, MLD etc. can be run over the virtual link 2392 */ 2393 2394 static void addrconf_ip6_tnl_config(struct net_device *dev) 2395 { 2396 struct inet6_dev *idev; 2397 2398 ASSERT_RTNL(); 2399 2400 if ((idev = addrconf_add_dev(dev)) == NULL) { 2401 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2402 return; 2403 } 2404 ip6_tnl_add_linklocal(idev); 2405 } 2406 2407 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2408 void * data) 2409 { 2410 struct net_device *dev = (struct net_device *) data; 2411 struct inet6_dev *idev = __in6_dev_get(dev); 2412 int run_pending = 0; 2413 int err; 2414 2415 switch(event) { 2416 case NETDEV_REGISTER: 2417 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2418 idev = ipv6_add_dev(dev); 2419 if (!idev) 2420 return notifier_from_errno(-ENOMEM); 2421 } 2422 break; 2423 case NETDEV_UP: 2424 case NETDEV_CHANGE: 2425 if (dev->flags & IFF_SLAVE) 2426 break; 2427 2428 if (event == NETDEV_UP) { 2429 if (!addrconf_qdisc_ok(dev)) { 2430 /* device is not ready yet. */ 2431 printk(KERN_INFO 2432 "ADDRCONF(NETDEV_UP): %s: " 2433 "link is not ready\n", 2434 dev->name); 2435 break; 2436 } 2437 2438 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2439 idev = ipv6_add_dev(dev); 2440 2441 if (idev) 2442 idev->if_flags |= IF_READY; 2443 } else { 2444 if (!addrconf_qdisc_ok(dev)) { 2445 /* device is still not ready. */ 2446 break; 2447 } 2448 2449 if (idev) { 2450 if (idev->if_flags & IF_READY) { 2451 /* device is already configured. */ 2452 break; 2453 } 2454 idev->if_flags |= IF_READY; 2455 } 2456 2457 printk(KERN_INFO 2458 "ADDRCONF(NETDEV_CHANGE): %s: " 2459 "link becomes ready\n", 2460 dev->name); 2461 2462 run_pending = 1; 2463 } 2464 2465 switch(dev->type) { 2466 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2467 case ARPHRD_SIT: 2468 addrconf_sit_config(dev); 2469 break; 2470 #endif 2471 case ARPHRD_TUNNEL6: 2472 addrconf_ip6_tnl_config(dev); 2473 break; 2474 case ARPHRD_LOOPBACK: 2475 init_loopback(dev); 2476 break; 2477 2478 default: 2479 addrconf_dev_config(dev); 2480 break; 2481 } 2482 if (idev) { 2483 if (run_pending) 2484 addrconf_dad_run(idev); 2485 2486 /* If the MTU changed during the interface down, when the 2487 interface up, the changed MTU must be reflected in the 2488 idev as well as routers. 2489 */ 2490 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2491 rt6_mtu_change(dev, dev->mtu); 2492 idev->cnf.mtu6 = dev->mtu; 2493 } 2494 idev->tstamp = jiffies; 2495 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2496 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2497 stop IPv6 on this interface. 2498 */ 2499 if (dev->mtu < IPV6_MIN_MTU) 2500 addrconf_ifdown(dev, event != NETDEV_DOWN); 2501 } 2502 break; 2503 2504 case NETDEV_CHANGEMTU: 2505 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2506 rt6_mtu_change(dev, dev->mtu); 2507 idev->cnf.mtu6 = dev->mtu; 2508 break; 2509 } 2510 2511 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2512 idev = ipv6_add_dev(dev); 2513 if (idev) 2514 break; 2515 } 2516 2517 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2518 2519 case NETDEV_DOWN: 2520 case NETDEV_UNREGISTER: 2521 /* 2522 * Remove all addresses from this interface. 2523 */ 2524 addrconf_ifdown(dev, event != NETDEV_DOWN); 2525 break; 2526 2527 case NETDEV_CHANGENAME: 2528 if (idev) { 2529 snmp6_unregister_dev(idev); 2530 addrconf_sysctl_unregister(idev); 2531 addrconf_sysctl_register(idev); 2532 err = snmp6_register_dev(idev); 2533 if (err) 2534 return notifier_from_errno(err); 2535 } 2536 break; 2537 } 2538 2539 return NOTIFY_OK; 2540 } 2541 2542 /* 2543 * addrconf module should be notified of a device going up 2544 */ 2545 static struct notifier_block ipv6_dev_notf = { 2546 .notifier_call = addrconf_notify, 2547 .priority = 0 2548 }; 2549 2550 static int addrconf_ifdown(struct net_device *dev, int how) 2551 { 2552 struct inet6_dev *idev; 2553 struct inet6_ifaddr *ifa, **bifa; 2554 struct net *net = dev_net(dev); 2555 int i; 2556 2557 ASSERT_RTNL(); 2558 2559 if ((dev->flags & IFF_LOOPBACK) && how == 1) 2560 how = 0; 2561 2562 rt6_ifdown(net, dev); 2563 neigh_ifdown(&nd_tbl, dev); 2564 2565 idev = __in6_dev_get(dev); 2566 if (idev == NULL) 2567 return -ENODEV; 2568 2569 /* Step 1: remove reference to ipv6 device from parent device. 2570 Do not dev_put! 2571 */ 2572 if (how) { 2573 idev->dead = 1; 2574 2575 /* protected by rtnl_lock */ 2576 rcu_assign_pointer(dev->ip6_ptr, NULL); 2577 2578 /* Step 1.5: remove snmp6 entry */ 2579 snmp6_unregister_dev(idev); 2580 2581 } 2582 2583 /* Step 2: clear hash table */ 2584 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2585 bifa = &inet6_addr_lst[i]; 2586 2587 write_lock_bh(&addrconf_hash_lock); 2588 while ((ifa = *bifa) != NULL) { 2589 if (ifa->idev == idev) { 2590 *bifa = ifa->lst_next; 2591 ifa->lst_next = NULL; 2592 addrconf_del_timer(ifa); 2593 in6_ifa_put(ifa); 2594 continue; 2595 } 2596 bifa = &ifa->lst_next; 2597 } 2598 write_unlock_bh(&addrconf_hash_lock); 2599 } 2600 2601 write_lock_bh(&idev->lock); 2602 2603 /* Step 3: clear flags for stateless addrconf */ 2604 if (!how) 2605 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2606 2607 /* Step 4: clear address list */ 2608 #ifdef CONFIG_IPV6_PRIVACY 2609 if (how && del_timer(&idev->regen_timer)) 2610 in6_dev_put(idev); 2611 2612 /* clear tempaddr list */ 2613 while ((ifa = idev->tempaddr_list) != NULL) { 2614 idev->tempaddr_list = ifa->tmp_next; 2615 ifa->tmp_next = NULL; 2616 ifa->dead = 1; 2617 write_unlock_bh(&idev->lock); 2618 spin_lock_bh(&ifa->lock); 2619 2620 if (ifa->ifpub) { 2621 in6_ifa_put(ifa->ifpub); 2622 ifa->ifpub = NULL; 2623 } 2624 spin_unlock_bh(&ifa->lock); 2625 in6_ifa_put(ifa); 2626 write_lock_bh(&idev->lock); 2627 } 2628 #endif 2629 while ((ifa = idev->addr_list) != NULL) { 2630 idev->addr_list = ifa->if_next; 2631 ifa->if_next = NULL; 2632 ifa->dead = 1; 2633 addrconf_del_timer(ifa); 2634 write_unlock_bh(&idev->lock); 2635 2636 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2638 in6_ifa_put(ifa); 2639 2640 write_lock_bh(&idev->lock); 2641 } 2642 write_unlock_bh(&idev->lock); 2643 2644 /* Step 5: Discard multicast list */ 2645 2646 if (how) 2647 ipv6_mc_destroy_dev(idev); 2648 else 2649 ipv6_mc_down(idev); 2650 2651 idev->tstamp = jiffies; 2652 2653 /* Shot the device (if unregistered) */ 2654 2655 if (how) { 2656 addrconf_sysctl_unregister(idev); 2657 neigh_parms_release(&nd_tbl, idev->nd_parms); 2658 neigh_ifdown(&nd_tbl, dev); 2659 in6_dev_put(idev); 2660 } 2661 return 0; 2662 } 2663 2664 static void addrconf_rs_timer(unsigned long data) 2665 { 2666 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2667 2668 if (ifp->idev->cnf.forwarding) 2669 goto out; 2670 2671 if (ifp->idev->if_flags & IF_RA_RCVD) { 2672 /* 2673 * Announcement received after solicitation 2674 * was sent 2675 */ 2676 goto out; 2677 } 2678 2679 spin_lock(&ifp->lock); 2680 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2681 /* The wait after the last probe can be shorter */ 2682 addrconf_mod_timer(ifp, AC_RS, 2683 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2684 ifp->idev->cnf.rtr_solicit_delay : 2685 ifp->idev->cnf.rtr_solicit_interval); 2686 spin_unlock(&ifp->lock); 2687 2688 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2689 } else { 2690 spin_unlock(&ifp->lock); 2691 /* 2692 * Note: we do not support deprecated "all on-link" 2693 * assumption any longer. 2694 */ 2695 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2696 ifp->idev->dev->name); 2697 } 2698 2699 out: 2700 in6_ifa_put(ifp); 2701 } 2702 2703 /* 2704 * Duplicate Address Detection 2705 */ 2706 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2707 { 2708 unsigned long rand_num; 2709 struct inet6_dev *idev = ifp->idev; 2710 2711 if (ifp->flags & IFA_F_OPTIMISTIC) 2712 rand_num = 0; 2713 else 2714 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2715 2716 ifp->probes = idev->cnf.dad_transmits; 2717 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2718 } 2719 2720 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2721 { 2722 struct inet6_dev *idev = ifp->idev; 2723 struct net_device *dev = idev->dev; 2724 2725 addrconf_join_solict(dev, &ifp->addr); 2726 2727 net_srandom(ifp->addr.s6_addr32[3]); 2728 2729 read_lock_bh(&idev->lock); 2730 if (ifp->dead) 2731 goto out; 2732 spin_lock_bh(&ifp->lock); 2733 2734 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2735 !(ifp->flags&IFA_F_TENTATIVE) || 2736 ifp->flags & IFA_F_NODAD) { 2737 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2738 spin_unlock_bh(&ifp->lock); 2739 read_unlock_bh(&idev->lock); 2740 2741 addrconf_dad_completed(ifp); 2742 return; 2743 } 2744 2745 if (!(idev->if_flags & IF_READY)) { 2746 spin_unlock_bh(&ifp->lock); 2747 read_unlock_bh(&idev->lock); 2748 /* 2749 * If the defice is not ready: 2750 * - keep it tentative if it is a permanent address. 2751 * - otherwise, kill it. 2752 */ 2753 in6_ifa_hold(ifp); 2754 addrconf_dad_stop(ifp); 2755 return; 2756 } 2757 2758 /* 2759 * Optimistic nodes can start receiving 2760 * Frames right away 2761 */ 2762 if(ifp->flags & IFA_F_OPTIMISTIC) 2763 ip6_ins_rt(ifp->rt); 2764 2765 addrconf_dad_kick(ifp); 2766 spin_unlock_bh(&ifp->lock); 2767 out: 2768 read_unlock_bh(&idev->lock); 2769 } 2770 2771 static void addrconf_dad_timer(unsigned long data) 2772 { 2773 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2774 struct inet6_dev *idev = ifp->idev; 2775 struct in6_addr mcaddr; 2776 2777 read_lock_bh(&idev->lock); 2778 if (idev->dead) { 2779 read_unlock_bh(&idev->lock); 2780 goto out; 2781 } 2782 spin_lock_bh(&ifp->lock); 2783 if (ifp->probes == 0) { 2784 /* 2785 * DAD was successful 2786 */ 2787 2788 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2789 spin_unlock_bh(&ifp->lock); 2790 read_unlock_bh(&idev->lock); 2791 2792 addrconf_dad_completed(ifp); 2793 2794 goto out; 2795 } 2796 2797 ifp->probes--; 2798 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2799 spin_unlock_bh(&ifp->lock); 2800 read_unlock_bh(&idev->lock); 2801 2802 /* send a neighbour solicitation for our addr */ 2803 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2804 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2805 out: 2806 in6_ifa_put(ifp); 2807 } 2808 2809 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2810 { 2811 struct net_device * dev = ifp->idev->dev; 2812 2813 /* 2814 * Configure the address for reception. Now it is valid. 2815 */ 2816 2817 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2818 2819 /* If added prefix is link local and forwarding is off, 2820 start sending router solicitations. 2821 */ 2822 2823 if (ifp->idev->cnf.forwarding == 0 && 2824 ifp->idev->cnf.rtr_solicits > 0 && 2825 (dev->flags&IFF_LOOPBACK) == 0 && 2826 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2827 /* 2828 * If a host as already performed a random delay 2829 * [...] as part of DAD [...] there is no need 2830 * to delay again before sending the first RS 2831 */ 2832 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2833 2834 spin_lock_bh(&ifp->lock); 2835 ifp->probes = 1; 2836 ifp->idev->if_flags |= IF_RS_SENT; 2837 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2838 spin_unlock_bh(&ifp->lock); 2839 } 2840 } 2841 2842 static void addrconf_dad_run(struct inet6_dev *idev) { 2843 struct inet6_ifaddr *ifp; 2844 2845 read_lock_bh(&idev->lock); 2846 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2847 spin_lock_bh(&ifp->lock); 2848 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2849 spin_unlock_bh(&ifp->lock); 2850 continue; 2851 } 2852 spin_unlock_bh(&ifp->lock); 2853 addrconf_dad_kick(ifp); 2854 } 2855 read_unlock_bh(&idev->lock); 2856 } 2857 2858 #ifdef CONFIG_PROC_FS 2859 struct if6_iter_state { 2860 struct seq_net_private p; 2861 int bucket; 2862 }; 2863 2864 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2865 { 2866 struct inet6_ifaddr *ifa = NULL; 2867 struct if6_iter_state *state = seq->private; 2868 struct net *net = seq_file_net(seq); 2869 2870 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2871 ifa = inet6_addr_lst[state->bucket]; 2872 2873 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2874 ifa = ifa->lst_next; 2875 if (ifa) 2876 break; 2877 } 2878 return ifa; 2879 } 2880 2881 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2882 { 2883 struct if6_iter_state *state = seq->private; 2884 struct net *net = seq_file_net(seq); 2885 2886 ifa = ifa->lst_next; 2887 try_again: 2888 if (ifa) { 2889 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2890 ifa = ifa->lst_next; 2891 goto try_again; 2892 } 2893 } 2894 2895 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2896 ifa = inet6_addr_lst[state->bucket]; 2897 goto try_again; 2898 } 2899 2900 return ifa; 2901 } 2902 2903 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2904 { 2905 struct inet6_ifaddr *ifa = if6_get_first(seq); 2906 2907 if (ifa) 2908 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2909 --pos; 2910 return pos ? NULL : ifa; 2911 } 2912 2913 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2914 __acquires(addrconf_hash_lock) 2915 { 2916 read_lock_bh(&addrconf_hash_lock); 2917 return if6_get_idx(seq, *pos); 2918 } 2919 2920 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2921 { 2922 struct inet6_ifaddr *ifa; 2923 2924 ifa = if6_get_next(seq, v); 2925 ++*pos; 2926 return ifa; 2927 } 2928 2929 static void if6_seq_stop(struct seq_file *seq, void *v) 2930 __releases(addrconf_hash_lock) 2931 { 2932 read_unlock_bh(&addrconf_hash_lock); 2933 } 2934 2935 static int if6_seq_show(struct seq_file *seq, void *v) 2936 { 2937 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2938 seq_printf(seq, 2939 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2940 NIP6(ifp->addr), 2941 ifp->idev->dev->ifindex, 2942 ifp->prefix_len, 2943 ifp->scope, 2944 ifp->flags, 2945 ifp->idev->dev->name); 2946 return 0; 2947 } 2948 2949 static const struct seq_operations if6_seq_ops = { 2950 .start = if6_seq_start, 2951 .next = if6_seq_next, 2952 .show = if6_seq_show, 2953 .stop = if6_seq_stop, 2954 }; 2955 2956 static int if6_seq_open(struct inode *inode, struct file *file) 2957 { 2958 return seq_open_net(inode, file, &if6_seq_ops, 2959 sizeof(struct if6_iter_state)); 2960 } 2961 2962 static const struct file_operations if6_fops = { 2963 .owner = THIS_MODULE, 2964 .open = if6_seq_open, 2965 .read = seq_read, 2966 .llseek = seq_lseek, 2967 .release = seq_release_net, 2968 }; 2969 2970 static int if6_proc_net_init(struct net *net) 2971 { 2972 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 2973 return -ENOMEM; 2974 return 0; 2975 } 2976 2977 static void if6_proc_net_exit(struct net *net) 2978 { 2979 proc_net_remove(net, "if_inet6"); 2980 } 2981 2982 static struct pernet_operations if6_proc_net_ops = { 2983 .init = if6_proc_net_init, 2984 .exit = if6_proc_net_exit, 2985 }; 2986 2987 int __init if6_proc_init(void) 2988 { 2989 return register_pernet_subsys(&if6_proc_net_ops); 2990 } 2991 2992 void if6_proc_exit(void) 2993 { 2994 unregister_pernet_subsys(&if6_proc_net_ops); 2995 } 2996 #endif /* CONFIG_PROC_FS */ 2997 2998 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 2999 /* Check if address is a home address configured on any interface. */ 3000 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3001 { 3002 int ret = 0; 3003 struct inet6_ifaddr * ifp; 3004 u8 hash = ipv6_addr_hash(addr); 3005 read_lock_bh(&addrconf_hash_lock); 3006 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 3007 if (!net_eq(dev_net(ifp->idev->dev), net)) 3008 continue; 3009 if (ipv6_addr_equal(&ifp->addr, addr) && 3010 (ifp->flags & IFA_F_HOMEADDRESS)) { 3011 ret = 1; 3012 break; 3013 } 3014 } 3015 read_unlock_bh(&addrconf_hash_lock); 3016 return ret; 3017 } 3018 #endif 3019 3020 /* 3021 * Periodic address status verification 3022 */ 3023 3024 static void addrconf_verify(unsigned long foo) 3025 { 3026 struct inet6_ifaddr *ifp; 3027 unsigned long now, next; 3028 int i; 3029 3030 spin_lock_bh(&addrconf_verify_lock); 3031 now = jiffies; 3032 next = now + ADDR_CHECK_FREQUENCY; 3033 3034 del_timer(&addr_chk_timer); 3035 3036 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3037 3038 restart: 3039 read_lock(&addrconf_hash_lock); 3040 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3041 unsigned long age; 3042 #ifdef CONFIG_IPV6_PRIVACY 3043 unsigned long regen_advance; 3044 #endif 3045 3046 if (ifp->flags & IFA_F_PERMANENT) 3047 continue; 3048 3049 spin_lock(&ifp->lock); 3050 age = (now - ifp->tstamp) / HZ; 3051 3052 #ifdef CONFIG_IPV6_PRIVACY 3053 regen_advance = ifp->idev->cnf.regen_max_retry * 3054 ifp->idev->cnf.dad_transmits * 3055 ifp->idev->nd_parms->retrans_time / HZ; 3056 #endif 3057 3058 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3059 age >= ifp->valid_lft) { 3060 spin_unlock(&ifp->lock); 3061 in6_ifa_hold(ifp); 3062 read_unlock(&addrconf_hash_lock); 3063 ipv6_del_addr(ifp); 3064 goto restart; 3065 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3066 spin_unlock(&ifp->lock); 3067 continue; 3068 } else if (age >= ifp->prefered_lft) { 3069 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 3070 int deprecate = 0; 3071 3072 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3073 deprecate = 1; 3074 ifp->flags |= IFA_F_DEPRECATED; 3075 } 3076 3077 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3078 next = ifp->tstamp + ifp->valid_lft * HZ; 3079 3080 spin_unlock(&ifp->lock); 3081 3082 if (deprecate) { 3083 in6_ifa_hold(ifp); 3084 read_unlock(&addrconf_hash_lock); 3085 3086 ipv6_ifa_notify(0, ifp); 3087 in6_ifa_put(ifp); 3088 goto restart; 3089 } 3090 #ifdef CONFIG_IPV6_PRIVACY 3091 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3092 !(ifp->flags&IFA_F_TENTATIVE)) { 3093 if (age >= ifp->prefered_lft - regen_advance) { 3094 struct inet6_ifaddr *ifpub = ifp->ifpub; 3095 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3096 next = ifp->tstamp + ifp->prefered_lft * HZ; 3097 if (!ifp->regen_count && ifpub) { 3098 ifp->regen_count++; 3099 in6_ifa_hold(ifp); 3100 in6_ifa_hold(ifpub); 3101 spin_unlock(&ifp->lock); 3102 read_unlock(&addrconf_hash_lock); 3103 spin_lock(&ifpub->lock); 3104 ifpub->regen_count = 0; 3105 spin_unlock(&ifpub->lock); 3106 ipv6_create_tempaddr(ifpub, ifp); 3107 in6_ifa_put(ifpub); 3108 in6_ifa_put(ifp); 3109 goto restart; 3110 } 3111 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3112 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3113 spin_unlock(&ifp->lock); 3114 #endif 3115 } else { 3116 /* ifp->prefered_lft <= ifp->valid_lft */ 3117 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3118 next = ifp->tstamp + ifp->prefered_lft * HZ; 3119 spin_unlock(&ifp->lock); 3120 } 3121 } 3122 read_unlock(&addrconf_hash_lock); 3123 } 3124 3125 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3126 add_timer(&addr_chk_timer); 3127 spin_unlock_bh(&addrconf_verify_lock); 3128 } 3129 3130 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3131 { 3132 struct in6_addr *pfx = NULL; 3133 3134 if (addr) 3135 pfx = nla_data(addr); 3136 3137 if (local) { 3138 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3139 pfx = NULL; 3140 else 3141 pfx = nla_data(local); 3142 } 3143 3144 return pfx; 3145 } 3146 3147 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3148 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3149 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3150 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3151 }; 3152 3153 static int 3154 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3155 { 3156 struct net *net = sock_net(skb->sk); 3157 struct ifaddrmsg *ifm; 3158 struct nlattr *tb[IFA_MAX+1]; 3159 struct in6_addr *pfx; 3160 int err; 3161 3162 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3163 if (err < 0) 3164 return err; 3165 3166 ifm = nlmsg_data(nlh); 3167 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3168 if (pfx == NULL) 3169 return -EINVAL; 3170 3171 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3172 } 3173 3174 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3175 u32 prefered_lft, u32 valid_lft) 3176 { 3177 u32 flags; 3178 clock_t expires; 3179 unsigned long timeout; 3180 3181 if (!valid_lft || (prefered_lft > valid_lft)) 3182 return -EINVAL; 3183 3184 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3185 if (addrconf_finite_timeout(timeout)) { 3186 expires = jiffies_to_clock_t(timeout * HZ); 3187 valid_lft = timeout; 3188 flags = RTF_EXPIRES; 3189 } else { 3190 expires = 0; 3191 flags = 0; 3192 ifa_flags |= IFA_F_PERMANENT; 3193 } 3194 3195 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3196 if (addrconf_finite_timeout(timeout)) { 3197 if (timeout == 0) 3198 ifa_flags |= IFA_F_DEPRECATED; 3199 prefered_lft = timeout; 3200 } 3201 3202 spin_lock_bh(&ifp->lock); 3203 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3204 ifp->tstamp = jiffies; 3205 ifp->valid_lft = valid_lft; 3206 ifp->prefered_lft = prefered_lft; 3207 3208 spin_unlock_bh(&ifp->lock); 3209 if (!(ifp->flags&IFA_F_TENTATIVE)) 3210 ipv6_ifa_notify(0, ifp); 3211 3212 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3213 expires, flags); 3214 addrconf_verify(0); 3215 3216 return 0; 3217 } 3218 3219 static int 3220 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3221 { 3222 struct net *net = sock_net(skb->sk); 3223 struct ifaddrmsg *ifm; 3224 struct nlattr *tb[IFA_MAX+1]; 3225 struct in6_addr *pfx; 3226 struct inet6_ifaddr *ifa; 3227 struct net_device *dev; 3228 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3229 u8 ifa_flags; 3230 int err; 3231 3232 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3233 if (err < 0) 3234 return err; 3235 3236 ifm = nlmsg_data(nlh); 3237 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3238 if (pfx == NULL) 3239 return -EINVAL; 3240 3241 if (tb[IFA_CACHEINFO]) { 3242 struct ifa_cacheinfo *ci; 3243 3244 ci = nla_data(tb[IFA_CACHEINFO]); 3245 valid_lft = ci->ifa_valid; 3246 preferred_lft = ci->ifa_prefered; 3247 } else { 3248 preferred_lft = INFINITY_LIFE_TIME; 3249 valid_lft = INFINITY_LIFE_TIME; 3250 } 3251 3252 dev = __dev_get_by_index(net, ifm->ifa_index); 3253 if (dev == NULL) 3254 return -ENODEV; 3255 3256 /* We ignore other flags so far. */ 3257 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3258 3259 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3260 if (ifa == NULL) { 3261 /* 3262 * It would be best to check for !NLM_F_CREATE here but 3263 * userspace alreay relies on not having to provide this. 3264 */ 3265 return inet6_addr_add(net, ifm->ifa_index, pfx, 3266 ifm->ifa_prefixlen, ifa_flags, 3267 preferred_lft, valid_lft); 3268 } 3269 3270 if (nlh->nlmsg_flags & NLM_F_EXCL || 3271 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3272 err = -EEXIST; 3273 else 3274 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3275 3276 in6_ifa_put(ifa); 3277 3278 return err; 3279 } 3280 3281 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3282 u8 scope, int ifindex) 3283 { 3284 struct ifaddrmsg *ifm; 3285 3286 ifm = nlmsg_data(nlh); 3287 ifm->ifa_family = AF_INET6; 3288 ifm->ifa_prefixlen = prefixlen; 3289 ifm->ifa_flags = flags; 3290 ifm->ifa_scope = scope; 3291 ifm->ifa_index = ifindex; 3292 } 3293 3294 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3295 unsigned long tstamp, u32 preferred, u32 valid) 3296 { 3297 struct ifa_cacheinfo ci; 3298 3299 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3300 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3301 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3302 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3303 ci.ifa_prefered = preferred; 3304 ci.ifa_valid = valid; 3305 3306 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3307 } 3308 3309 static inline int rt_scope(int ifa_scope) 3310 { 3311 if (ifa_scope & IFA_HOST) 3312 return RT_SCOPE_HOST; 3313 else if (ifa_scope & IFA_LINK) 3314 return RT_SCOPE_LINK; 3315 else if (ifa_scope & IFA_SITE) 3316 return RT_SCOPE_SITE; 3317 else 3318 return RT_SCOPE_UNIVERSE; 3319 } 3320 3321 static inline int inet6_ifaddr_msgsize(void) 3322 { 3323 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3324 + nla_total_size(16) /* IFA_ADDRESS */ 3325 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3326 } 3327 3328 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3329 u32 pid, u32 seq, int event, unsigned int flags) 3330 { 3331 struct nlmsghdr *nlh; 3332 u32 preferred, valid; 3333 3334 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3335 if (nlh == NULL) 3336 return -EMSGSIZE; 3337 3338 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3339 ifa->idev->dev->ifindex); 3340 3341 if (!(ifa->flags&IFA_F_PERMANENT)) { 3342 preferred = ifa->prefered_lft; 3343 valid = ifa->valid_lft; 3344 if (preferred != INFINITY_LIFE_TIME) { 3345 long tval = (jiffies - ifa->tstamp)/HZ; 3346 preferred -= tval; 3347 if (valid != INFINITY_LIFE_TIME) 3348 valid -= tval; 3349 } 3350 } else { 3351 preferred = INFINITY_LIFE_TIME; 3352 valid = INFINITY_LIFE_TIME; 3353 } 3354 3355 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3356 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3357 nlmsg_cancel(skb, nlh); 3358 return -EMSGSIZE; 3359 } 3360 3361 return nlmsg_end(skb, nlh); 3362 } 3363 3364 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3365 u32 pid, u32 seq, int event, u16 flags) 3366 { 3367 struct nlmsghdr *nlh; 3368 u8 scope = RT_SCOPE_UNIVERSE; 3369 int ifindex = ifmca->idev->dev->ifindex; 3370 3371 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3372 scope = RT_SCOPE_SITE; 3373 3374 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3375 if (nlh == NULL) 3376 return -EMSGSIZE; 3377 3378 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3379 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3380 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3381 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3382 nlmsg_cancel(skb, nlh); 3383 return -EMSGSIZE; 3384 } 3385 3386 return nlmsg_end(skb, nlh); 3387 } 3388 3389 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3390 u32 pid, u32 seq, int event, unsigned int flags) 3391 { 3392 struct nlmsghdr *nlh; 3393 u8 scope = RT_SCOPE_UNIVERSE; 3394 int ifindex = ifaca->aca_idev->dev->ifindex; 3395 3396 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3397 scope = RT_SCOPE_SITE; 3398 3399 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3400 if (nlh == NULL) 3401 return -EMSGSIZE; 3402 3403 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3404 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3405 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3406 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3407 nlmsg_cancel(skb, nlh); 3408 return -EMSGSIZE; 3409 } 3410 3411 return nlmsg_end(skb, nlh); 3412 } 3413 3414 enum addr_type_t 3415 { 3416 UNICAST_ADDR, 3417 MULTICAST_ADDR, 3418 ANYCAST_ADDR, 3419 }; 3420 3421 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3422 enum addr_type_t type) 3423 { 3424 int idx, ip_idx; 3425 int s_idx, s_ip_idx; 3426 int err = 1; 3427 struct net_device *dev; 3428 struct inet6_dev *idev = NULL; 3429 struct inet6_ifaddr *ifa; 3430 struct ifmcaddr6 *ifmca; 3431 struct ifacaddr6 *ifaca; 3432 struct net *net = sock_net(skb->sk); 3433 3434 s_idx = cb->args[0]; 3435 s_ip_idx = ip_idx = cb->args[1]; 3436 3437 idx = 0; 3438 for_each_netdev(net, dev) { 3439 if (idx < s_idx) 3440 goto cont; 3441 if (idx > s_idx) 3442 s_ip_idx = 0; 3443 ip_idx = 0; 3444 if ((idev = in6_dev_get(dev)) == NULL) 3445 goto cont; 3446 read_lock_bh(&idev->lock); 3447 switch (type) { 3448 case UNICAST_ADDR: 3449 /* unicast address incl. temp addr */ 3450 for (ifa = idev->addr_list; ifa; 3451 ifa = ifa->if_next, ip_idx++) { 3452 if (ip_idx < s_ip_idx) 3453 continue; 3454 err = inet6_fill_ifaddr(skb, ifa, 3455 NETLINK_CB(cb->skb).pid, 3456 cb->nlh->nlmsg_seq, 3457 RTM_NEWADDR, 3458 NLM_F_MULTI); 3459 } 3460 break; 3461 case MULTICAST_ADDR: 3462 /* multicast address */ 3463 for (ifmca = idev->mc_list; ifmca; 3464 ifmca = ifmca->next, ip_idx++) { 3465 if (ip_idx < s_ip_idx) 3466 continue; 3467 err = inet6_fill_ifmcaddr(skb, ifmca, 3468 NETLINK_CB(cb->skb).pid, 3469 cb->nlh->nlmsg_seq, 3470 RTM_GETMULTICAST, 3471 NLM_F_MULTI); 3472 } 3473 break; 3474 case ANYCAST_ADDR: 3475 /* anycast address */ 3476 for (ifaca = idev->ac_list; ifaca; 3477 ifaca = ifaca->aca_next, ip_idx++) { 3478 if (ip_idx < s_ip_idx) 3479 continue; 3480 err = inet6_fill_ifacaddr(skb, ifaca, 3481 NETLINK_CB(cb->skb).pid, 3482 cb->nlh->nlmsg_seq, 3483 RTM_GETANYCAST, 3484 NLM_F_MULTI); 3485 } 3486 break; 3487 default: 3488 break; 3489 } 3490 read_unlock_bh(&idev->lock); 3491 in6_dev_put(idev); 3492 3493 if (err <= 0) 3494 break; 3495 cont: 3496 idx++; 3497 } 3498 cb->args[0] = idx; 3499 cb->args[1] = ip_idx; 3500 return skb->len; 3501 } 3502 3503 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3504 { 3505 enum addr_type_t type = UNICAST_ADDR; 3506 3507 return inet6_dump_addr(skb, cb, type); 3508 } 3509 3510 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3511 { 3512 enum addr_type_t type = MULTICAST_ADDR; 3513 3514 return inet6_dump_addr(skb, cb, type); 3515 } 3516 3517 3518 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3519 { 3520 enum addr_type_t type = ANYCAST_ADDR; 3521 3522 return inet6_dump_addr(skb, cb, type); 3523 } 3524 3525 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3526 void *arg) 3527 { 3528 struct net *net = sock_net(in_skb->sk); 3529 struct ifaddrmsg *ifm; 3530 struct nlattr *tb[IFA_MAX+1]; 3531 struct in6_addr *addr = NULL; 3532 struct net_device *dev = NULL; 3533 struct inet6_ifaddr *ifa; 3534 struct sk_buff *skb; 3535 int err; 3536 3537 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3538 if (err < 0) 3539 goto errout; 3540 3541 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3542 if (addr == NULL) { 3543 err = -EINVAL; 3544 goto errout; 3545 } 3546 3547 ifm = nlmsg_data(nlh); 3548 if (ifm->ifa_index) 3549 dev = __dev_get_by_index(net, ifm->ifa_index); 3550 3551 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3552 err = -EADDRNOTAVAIL; 3553 goto errout; 3554 } 3555 3556 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3557 err = -ENOBUFS; 3558 goto errout_ifa; 3559 } 3560 3561 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3562 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3563 if (err < 0) { 3564 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3565 WARN_ON(err == -EMSGSIZE); 3566 kfree_skb(skb); 3567 goto errout_ifa; 3568 } 3569 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3570 errout_ifa: 3571 in6_ifa_put(ifa); 3572 errout: 3573 return err; 3574 } 3575 3576 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3577 { 3578 struct sk_buff *skb; 3579 struct net *net = dev_net(ifa->idev->dev); 3580 int err = -ENOBUFS; 3581 3582 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3583 if (skb == NULL) 3584 goto errout; 3585 3586 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3587 if (err < 0) { 3588 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3589 WARN_ON(err == -EMSGSIZE); 3590 kfree_skb(skb); 3591 goto errout; 3592 } 3593 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3594 errout: 3595 if (err < 0) 3596 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3597 } 3598 3599 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3600 __s32 *array, int bytes) 3601 { 3602 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3603 3604 memset(array, 0, bytes); 3605 array[DEVCONF_FORWARDING] = cnf->forwarding; 3606 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3607 array[DEVCONF_MTU6] = cnf->mtu6; 3608 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3609 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3610 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3611 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3612 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3613 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3614 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3615 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3616 #ifdef CONFIG_IPV6_PRIVACY 3617 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3618 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3619 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3620 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3621 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3622 #endif 3623 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3624 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3625 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3626 #ifdef CONFIG_IPV6_ROUTER_PREF 3627 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3628 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3629 #ifdef CONFIG_IPV6_ROUTE_INFO 3630 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3631 #endif 3632 #endif 3633 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3634 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3635 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3636 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3637 #endif 3638 #ifdef CONFIG_IPV6_MROUTE 3639 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3640 #endif 3641 } 3642 3643 static inline size_t inet6_if_nlmsg_size(void) 3644 { 3645 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3646 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3647 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3648 + nla_total_size(4) /* IFLA_MTU */ 3649 + nla_total_size(4) /* IFLA_LINK */ 3650 + nla_total_size( /* IFLA_PROTINFO */ 3651 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3652 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3653 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3654 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3655 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3656 ); 3657 } 3658 3659 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3660 int bytes) 3661 { 3662 int i; 3663 int pad = bytes - sizeof(u64) * items; 3664 BUG_ON(pad < 0); 3665 3666 /* Use put_unaligned() because stats may not be aligned for u64. */ 3667 put_unaligned(items, &stats[0]); 3668 for (i = 1; i < items; i++) 3669 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3670 3671 memset(&stats[items], 0, pad); 3672 } 3673 3674 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3675 int bytes) 3676 { 3677 switch(attrtype) { 3678 case IFLA_INET6_STATS: 3679 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3680 break; 3681 case IFLA_INET6_ICMP6STATS: 3682 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3683 break; 3684 } 3685 } 3686 3687 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3688 u32 pid, u32 seq, int event, unsigned int flags) 3689 { 3690 struct net_device *dev = idev->dev; 3691 struct nlattr *nla; 3692 struct ifinfomsg *hdr; 3693 struct nlmsghdr *nlh; 3694 void *protoinfo; 3695 struct ifla_cacheinfo ci; 3696 3697 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3698 if (nlh == NULL) 3699 return -EMSGSIZE; 3700 3701 hdr = nlmsg_data(nlh); 3702 hdr->ifi_family = AF_INET6; 3703 hdr->__ifi_pad = 0; 3704 hdr->ifi_type = dev->type; 3705 hdr->ifi_index = dev->ifindex; 3706 hdr->ifi_flags = dev_get_flags(dev); 3707 hdr->ifi_change = 0; 3708 3709 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3710 3711 if (dev->addr_len) 3712 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3713 3714 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3715 if (dev->ifindex != dev->iflink) 3716 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3717 3718 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3719 if (protoinfo == NULL) 3720 goto nla_put_failure; 3721 3722 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3723 3724 ci.max_reasm_len = IPV6_MAXPLEN; 3725 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3726 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3727 ci.reachable_time = idev->nd_parms->reachable_time; 3728 ci.retrans_time = idev->nd_parms->retrans_time; 3729 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3730 3731 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3732 if (nla == NULL) 3733 goto nla_put_failure; 3734 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3735 3736 /* XXX - MC not implemented */ 3737 3738 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3739 if (nla == NULL) 3740 goto nla_put_failure; 3741 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3742 3743 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3744 if (nla == NULL) 3745 goto nla_put_failure; 3746 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3747 3748 nla_nest_end(skb, protoinfo); 3749 return nlmsg_end(skb, nlh); 3750 3751 nla_put_failure: 3752 nlmsg_cancel(skb, nlh); 3753 return -EMSGSIZE; 3754 } 3755 3756 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3757 { 3758 struct net *net = sock_net(skb->sk); 3759 int idx, err; 3760 int s_idx = cb->args[0]; 3761 struct net_device *dev; 3762 struct inet6_dev *idev; 3763 3764 read_lock(&dev_base_lock); 3765 idx = 0; 3766 for_each_netdev(net, dev) { 3767 if (idx < s_idx) 3768 goto cont; 3769 if ((idev = in6_dev_get(dev)) == NULL) 3770 goto cont; 3771 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3772 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3773 in6_dev_put(idev); 3774 if (err <= 0) 3775 break; 3776 cont: 3777 idx++; 3778 } 3779 read_unlock(&dev_base_lock); 3780 cb->args[0] = idx; 3781 3782 return skb->len; 3783 } 3784 3785 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3786 { 3787 struct sk_buff *skb; 3788 struct net *net = dev_net(idev->dev); 3789 int err = -ENOBUFS; 3790 3791 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3792 if (skb == NULL) 3793 goto errout; 3794 3795 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3796 if (err < 0) { 3797 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3798 WARN_ON(err == -EMSGSIZE); 3799 kfree_skb(skb); 3800 goto errout; 3801 } 3802 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3803 errout: 3804 if (err < 0) 3805 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3806 } 3807 3808 static inline size_t inet6_prefix_nlmsg_size(void) 3809 { 3810 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3811 + nla_total_size(sizeof(struct in6_addr)) 3812 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3813 } 3814 3815 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3816 struct prefix_info *pinfo, u32 pid, u32 seq, 3817 int event, unsigned int flags) 3818 { 3819 struct prefixmsg *pmsg; 3820 struct nlmsghdr *nlh; 3821 struct prefix_cacheinfo ci; 3822 3823 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3824 if (nlh == NULL) 3825 return -EMSGSIZE; 3826 3827 pmsg = nlmsg_data(nlh); 3828 pmsg->prefix_family = AF_INET6; 3829 pmsg->prefix_pad1 = 0; 3830 pmsg->prefix_pad2 = 0; 3831 pmsg->prefix_ifindex = idev->dev->ifindex; 3832 pmsg->prefix_len = pinfo->prefix_len; 3833 pmsg->prefix_type = pinfo->type; 3834 pmsg->prefix_pad3 = 0; 3835 pmsg->prefix_flags = 0; 3836 if (pinfo->onlink) 3837 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3838 if (pinfo->autoconf) 3839 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3840 3841 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3842 3843 ci.preferred_time = ntohl(pinfo->prefered); 3844 ci.valid_time = ntohl(pinfo->valid); 3845 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3846 3847 return nlmsg_end(skb, nlh); 3848 3849 nla_put_failure: 3850 nlmsg_cancel(skb, nlh); 3851 return -EMSGSIZE; 3852 } 3853 3854 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3855 struct prefix_info *pinfo) 3856 { 3857 struct sk_buff *skb; 3858 struct net *net = dev_net(idev->dev); 3859 int err = -ENOBUFS; 3860 3861 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3862 if (skb == NULL) 3863 goto errout; 3864 3865 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3866 if (err < 0) { 3867 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3868 WARN_ON(err == -EMSGSIZE); 3869 kfree_skb(skb); 3870 goto errout; 3871 } 3872 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3873 errout: 3874 if (err < 0) 3875 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3876 } 3877 3878 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3879 { 3880 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3881 3882 switch (event) { 3883 case RTM_NEWADDR: 3884 /* 3885 * If the address was optimistic 3886 * we inserted the route at the start of 3887 * our DAD process, so we don't need 3888 * to do it again 3889 */ 3890 if (!(ifp->rt->rt6i_node)) 3891 ip6_ins_rt(ifp->rt); 3892 if (ifp->idev->cnf.forwarding) 3893 addrconf_join_anycast(ifp); 3894 break; 3895 case RTM_DELADDR: 3896 if (ifp->idev->cnf.forwarding) 3897 addrconf_leave_anycast(ifp); 3898 addrconf_leave_solict(ifp->idev, &ifp->addr); 3899 dst_hold(&ifp->rt->u.dst); 3900 if (ip6_del_rt(ifp->rt)) 3901 dst_free(&ifp->rt->u.dst); 3902 break; 3903 } 3904 } 3905 3906 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3907 { 3908 rcu_read_lock_bh(); 3909 if (likely(ifp->idev->dead == 0)) 3910 __ipv6_ifa_notify(event, ifp); 3911 rcu_read_unlock_bh(); 3912 } 3913 3914 #ifdef CONFIG_SYSCTL 3915 3916 static 3917 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3918 void __user *buffer, size_t *lenp, loff_t *ppos) 3919 { 3920 int *valp = ctl->data; 3921 int val = *valp; 3922 int ret; 3923 3924 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3925 3926 if (write) 3927 addrconf_fixup_forwarding(ctl, valp, val); 3928 return ret; 3929 } 3930 3931 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3932 int __user *name, int nlen, 3933 void __user *oldval, 3934 size_t __user *oldlenp, 3935 void __user *newval, size_t newlen) 3936 { 3937 int *valp = table->data; 3938 int val = *valp; 3939 int new; 3940 3941 if (!newval || !newlen) 3942 return 0; 3943 if (newlen != sizeof(int)) 3944 return -EINVAL; 3945 if (get_user(new, (int __user *)newval)) 3946 return -EFAULT; 3947 if (new == *valp) 3948 return 0; 3949 if (oldval && oldlenp) { 3950 size_t len; 3951 if (get_user(len, oldlenp)) 3952 return -EFAULT; 3953 if (len) { 3954 if (len > table->maxlen) 3955 len = table->maxlen; 3956 if (copy_to_user(oldval, valp, len)) 3957 return -EFAULT; 3958 if (put_user(len, oldlenp)) 3959 return -EFAULT; 3960 } 3961 } 3962 3963 *valp = new; 3964 addrconf_fixup_forwarding(table, valp, val); 3965 return 1; 3966 } 3967 3968 static struct addrconf_sysctl_table 3969 { 3970 struct ctl_table_header *sysctl_header; 3971 ctl_table addrconf_vars[DEVCONF_MAX+1]; 3972 char *dev_name; 3973 } addrconf_sysctl __read_mostly = { 3974 .sysctl_header = NULL, 3975 .addrconf_vars = { 3976 { 3977 .ctl_name = NET_IPV6_FORWARDING, 3978 .procname = "forwarding", 3979 .data = &ipv6_devconf.forwarding, 3980 .maxlen = sizeof(int), 3981 .mode = 0644, 3982 .proc_handler = &addrconf_sysctl_forward, 3983 .strategy = &addrconf_sysctl_forward_strategy, 3984 }, 3985 { 3986 .ctl_name = NET_IPV6_HOP_LIMIT, 3987 .procname = "hop_limit", 3988 .data = &ipv6_devconf.hop_limit, 3989 .maxlen = sizeof(int), 3990 .mode = 0644, 3991 .proc_handler = proc_dointvec, 3992 }, 3993 { 3994 .ctl_name = NET_IPV6_MTU, 3995 .procname = "mtu", 3996 .data = &ipv6_devconf.mtu6, 3997 .maxlen = sizeof(int), 3998 .mode = 0644, 3999 .proc_handler = &proc_dointvec, 4000 }, 4001 { 4002 .ctl_name = NET_IPV6_ACCEPT_RA, 4003 .procname = "accept_ra", 4004 .data = &ipv6_devconf.accept_ra, 4005 .maxlen = sizeof(int), 4006 .mode = 0644, 4007 .proc_handler = &proc_dointvec, 4008 }, 4009 { 4010 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 4011 .procname = "accept_redirects", 4012 .data = &ipv6_devconf.accept_redirects, 4013 .maxlen = sizeof(int), 4014 .mode = 0644, 4015 .proc_handler = &proc_dointvec, 4016 }, 4017 { 4018 .ctl_name = NET_IPV6_AUTOCONF, 4019 .procname = "autoconf", 4020 .data = &ipv6_devconf.autoconf, 4021 .maxlen = sizeof(int), 4022 .mode = 0644, 4023 .proc_handler = &proc_dointvec, 4024 }, 4025 { 4026 .ctl_name = NET_IPV6_DAD_TRANSMITS, 4027 .procname = "dad_transmits", 4028 .data = &ipv6_devconf.dad_transmits, 4029 .maxlen = sizeof(int), 4030 .mode = 0644, 4031 .proc_handler = &proc_dointvec, 4032 }, 4033 { 4034 .ctl_name = NET_IPV6_RTR_SOLICITS, 4035 .procname = "router_solicitations", 4036 .data = &ipv6_devconf.rtr_solicits, 4037 .maxlen = sizeof(int), 4038 .mode = 0644, 4039 .proc_handler = &proc_dointvec, 4040 }, 4041 { 4042 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 4043 .procname = "router_solicitation_interval", 4044 .data = &ipv6_devconf.rtr_solicit_interval, 4045 .maxlen = sizeof(int), 4046 .mode = 0644, 4047 .proc_handler = &proc_dointvec_jiffies, 4048 .strategy = &sysctl_jiffies, 4049 }, 4050 { 4051 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 4052 .procname = "router_solicitation_delay", 4053 .data = &ipv6_devconf.rtr_solicit_delay, 4054 .maxlen = sizeof(int), 4055 .mode = 0644, 4056 .proc_handler = &proc_dointvec_jiffies, 4057 .strategy = &sysctl_jiffies, 4058 }, 4059 { 4060 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 4061 .procname = "force_mld_version", 4062 .data = &ipv6_devconf.force_mld_version, 4063 .maxlen = sizeof(int), 4064 .mode = 0644, 4065 .proc_handler = &proc_dointvec, 4066 }, 4067 #ifdef CONFIG_IPV6_PRIVACY 4068 { 4069 .ctl_name = NET_IPV6_USE_TEMPADDR, 4070 .procname = "use_tempaddr", 4071 .data = &ipv6_devconf.use_tempaddr, 4072 .maxlen = sizeof(int), 4073 .mode = 0644, 4074 .proc_handler = &proc_dointvec, 4075 }, 4076 { 4077 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 4078 .procname = "temp_valid_lft", 4079 .data = &ipv6_devconf.temp_valid_lft, 4080 .maxlen = sizeof(int), 4081 .mode = 0644, 4082 .proc_handler = &proc_dointvec, 4083 }, 4084 { 4085 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 4086 .procname = "temp_prefered_lft", 4087 .data = &ipv6_devconf.temp_prefered_lft, 4088 .maxlen = sizeof(int), 4089 .mode = 0644, 4090 .proc_handler = &proc_dointvec, 4091 }, 4092 { 4093 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4094 .procname = "regen_max_retry", 4095 .data = &ipv6_devconf.regen_max_retry, 4096 .maxlen = sizeof(int), 4097 .mode = 0644, 4098 .proc_handler = &proc_dointvec, 4099 }, 4100 { 4101 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4102 .procname = "max_desync_factor", 4103 .data = &ipv6_devconf.max_desync_factor, 4104 .maxlen = sizeof(int), 4105 .mode = 0644, 4106 .proc_handler = &proc_dointvec, 4107 }, 4108 #endif 4109 { 4110 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4111 .procname = "max_addresses", 4112 .data = &ipv6_devconf.max_addresses, 4113 .maxlen = sizeof(int), 4114 .mode = 0644, 4115 .proc_handler = &proc_dointvec, 4116 }, 4117 { 4118 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4119 .procname = "accept_ra_defrtr", 4120 .data = &ipv6_devconf.accept_ra_defrtr, 4121 .maxlen = sizeof(int), 4122 .mode = 0644, 4123 .proc_handler = &proc_dointvec, 4124 }, 4125 { 4126 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4127 .procname = "accept_ra_pinfo", 4128 .data = &ipv6_devconf.accept_ra_pinfo, 4129 .maxlen = sizeof(int), 4130 .mode = 0644, 4131 .proc_handler = &proc_dointvec, 4132 }, 4133 #ifdef CONFIG_IPV6_ROUTER_PREF 4134 { 4135 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4136 .procname = "accept_ra_rtr_pref", 4137 .data = &ipv6_devconf.accept_ra_rtr_pref, 4138 .maxlen = sizeof(int), 4139 .mode = 0644, 4140 .proc_handler = &proc_dointvec, 4141 }, 4142 { 4143 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4144 .procname = "router_probe_interval", 4145 .data = &ipv6_devconf.rtr_probe_interval, 4146 .maxlen = sizeof(int), 4147 .mode = 0644, 4148 .proc_handler = &proc_dointvec_jiffies, 4149 .strategy = &sysctl_jiffies, 4150 }, 4151 #ifdef CONFIG_IPV6_ROUTE_INFO 4152 { 4153 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4154 .procname = "accept_ra_rt_info_max_plen", 4155 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4156 .maxlen = sizeof(int), 4157 .mode = 0644, 4158 .proc_handler = &proc_dointvec, 4159 }, 4160 #endif 4161 #endif 4162 { 4163 .ctl_name = NET_IPV6_PROXY_NDP, 4164 .procname = "proxy_ndp", 4165 .data = &ipv6_devconf.proxy_ndp, 4166 .maxlen = sizeof(int), 4167 .mode = 0644, 4168 .proc_handler = &proc_dointvec, 4169 }, 4170 { 4171 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4172 .procname = "accept_source_route", 4173 .data = &ipv6_devconf.accept_source_route, 4174 .maxlen = sizeof(int), 4175 .mode = 0644, 4176 .proc_handler = &proc_dointvec, 4177 }, 4178 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4179 { 4180 .ctl_name = CTL_UNNUMBERED, 4181 .procname = "optimistic_dad", 4182 .data = &ipv6_devconf.optimistic_dad, 4183 .maxlen = sizeof(int), 4184 .mode = 0644, 4185 .proc_handler = &proc_dointvec, 4186 4187 }, 4188 #endif 4189 #ifdef CONFIG_IPV6_MROUTE 4190 { 4191 .ctl_name = CTL_UNNUMBERED, 4192 .procname = "mc_forwarding", 4193 .data = &ipv6_devconf.mc_forwarding, 4194 .maxlen = sizeof(int), 4195 .mode = 0644, 4196 .proc_handler = &proc_dointvec, 4197 }, 4198 #endif 4199 { 4200 .ctl_name = 0, /* sentinel */ 4201 } 4202 }, 4203 }; 4204 4205 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4206 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4207 { 4208 int i; 4209 struct addrconf_sysctl_table *t; 4210 4211 #define ADDRCONF_CTL_PATH_DEV 3 4212 4213 struct ctl_path addrconf_ctl_path[] = { 4214 { .procname = "net", .ctl_name = CTL_NET, }, 4215 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4216 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4217 { /* to be set */ }, 4218 { }, 4219 }; 4220 4221 4222 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4223 if (t == NULL) 4224 goto out; 4225 4226 for (i=0; t->addrconf_vars[i].data; i++) { 4227 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4228 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4229 t->addrconf_vars[i].extra2 = net; 4230 } 4231 4232 /* 4233 * Make a copy of dev_name, because '.procname' is regarded as const 4234 * by sysctl and we wouldn't want anyone to change it under our feet 4235 * (see SIOCSIFNAME). 4236 */ 4237 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4238 if (!t->dev_name) 4239 goto free; 4240 4241 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4242 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4243 4244 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4245 t->addrconf_vars); 4246 if (t->sysctl_header == NULL) 4247 goto free_procname; 4248 4249 p->sysctl = t; 4250 return 0; 4251 4252 free_procname: 4253 kfree(t->dev_name); 4254 free: 4255 kfree(t); 4256 out: 4257 return -ENOBUFS; 4258 } 4259 4260 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4261 { 4262 struct addrconf_sysctl_table *t; 4263 4264 if (p->sysctl == NULL) 4265 return; 4266 4267 t = p->sysctl; 4268 p->sysctl = NULL; 4269 unregister_sysctl_table(t->sysctl_header); 4270 kfree(t->dev_name); 4271 kfree(t); 4272 } 4273 4274 static void addrconf_sysctl_register(struct inet6_dev *idev) 4275 { 4276 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4277 NET_IPV6_NEIGH, "ipv6", 4278 &ndisc_ifinfo_sysctl_change, 4279 ndisc_ifinfo_sysctl_strategy); 4280 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4281 idev->dev->ifindex, idev, &idev->cnf); 4282 } 4283 4284 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4285 { 4286 __addrconf_sysctl_unregister(&idev->cnf); 4287 neigh_sysctl_unregister(idev->nd_parms); 4288 } 4289 4290 4291 #endif 4292 4293 static int addrconf_init_net(struct net *net) 4294 { 4295 int err; 4296 struct ipv6_devconf *all, *dflt; 4297 4298 err = -ENOMEM; 4299 all = &ipv6_devconf; 4300 dflt = &ipv6_devconf_dflt; 4301 4302 if (net != &init_net) { 4303 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4304 if (all == NULL) 4305 goto err_alloc_all; 4306 4307 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4308 if (dflt == NULL) 4309 goto err_alloc_dflt; 4310 } 4311 4312 net->ipv6.devconf_all = all; 4313 net->ipv6.devconf_dflt = dflt; 4314 4315 #ifdef CONFIG_SYSCTL 4316 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4317 NULL, all); 4318 if (err < 0) 4319 goto err_reg_all; 4320 4321 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4322 NULL, dflt); 4323 if (err < 0) 4324 goto err_reg_dflt; 4325 #endif 4326 return 0; 4327 4328 #ifdef CONFIG_SYSCTL 4329 err_reg_dflt: 4330 __addrconf_sysctl_unregister(all); 4331 err_reg_all: 4332 kfree(dflt); 4333 #endif 4334 err_alloc_dflt: 4335 kfree(all); 4336 err_alloc_all: 4337 return err; 4338 } 4339 4340 static void addrconf_exit_net(struct net *net) 4341 { 4342 #ifdef CONFIG_SYSCTL 4343 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4344 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4345 #endif 4346 if (net != &init_net) { 4347 kfree(net->ipv6.devconf_dflt); 4348 kfree(net->ipv6.devconf_all); 4349 } 4350 } 4351 4352 static struct pernet_operations addrconf_ops = { 4353 .init = addrconf_init_net, 4354 .exit = addrconf_exit_net, 4355 }; 4356 4357 /* 4358 * Device notifier 4359 */ 4360 4361 int register_inet6addr_notifier(struct notifier_block *nb) 4362 { 4363 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4364 } 4365 4366 EXPORT_SYMBOL(register_inet6addr_notifier); 4367 4368 int unregister_inet6addr_notifier(struct notifier_block *nb) 4369 { 4370 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4371 } 4372 4373 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4374 4375 static void addrconf_net_exit(struct net *net) 4376 { 4377 struct net_device *dev; 4378 4379 rtnl_lock(); 4380 /* clean dev list */ 4381 for_each_netdev(net, dev) { 4382 if (__in6_dev_get(dev) == NULL) 4383 continue; 4384 addrconf_ifdown(dev, 1); 4385 } 4386 addrconf_ifdown(net->loopback_dev, 2); 4387 rtnl_unlock(); 4388 } 4389 4390 static struct pernet_operations addrconf_net_ops = { 4391 .exit = addrconf_net_exit, 4392 }; 4393 4394 /* 4395 * Init / cleanup code 4396 */ 4397 4398 int __init addrconf_init(void) 4399 { 4400 int err; 4401 4402 if ((err = ipv6_addr_label_init()) < 0) { 4403 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4404 err); 4405 return err; 4406 } 4407 4408 register_pernet_subsys(&addrconf_ops); 4409 4410 /* The addrconf netdev notifier requires that loopback_dev 4411 * has it's ipv6 private information allocated and setup 4412 * before it can bring up and give link-local addresses 4413 * to other devices which are up. 4414 * 4415 * Unfortunately, loopback_dev is not necessarily the first 4416 * entry in the global dev_base list of net devices. In fact, 4417 * it is likely to be the very last entry on that list. 4418 * So this causes the notifier registry below to try and 4419 * give link-local addresses to all devices besides loopback_dev 4420 * first, then loopback_dev, which cases all the non-loopback_dev 4421 * devices to fail to get a link-local address. 4422 * 4423 * So, as a temporary fix, allocate the ipv6 structure for 4424 * loopback_dev first by hand. 4425 * Longer term, all of the dependencies ipv6 has upon the loopback 4426 * device and it being up should be removed. 4427 */ 4428 rtnl_lock(); 4429 if (!ipv6_add_dev(init_net.loopback_dev)) 4430 err = -ENOMEM; 4431 rtnl_unlock(); 4432 if (err) 4433 goto errlo; 4434 4435 err = register_pernet_device(&addrconf_net_ops); 4436 if (err) 4437 return err; 4438 4439 register_netdevice_notifier(&ipv6_dev_notf); 4440 4441 addrconf_verify(0); 4442 4443 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4444 if (err < 0) 4445 goto errout; 4446 4447 /* Only the first call to __rtnl_register can fail */ 4448 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4449 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4450 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4451 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4452 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4453 4454 ipv6_addr_label_rtnl_register(); 4455 4456 return 0; 4457 errout: 4458 unregister_netdevice_notifier(&ipv6_dev_notf); 4459 errlo: 4460 unregister_pernet_subsys(&addrconf_ops); 4461 4462 return err; 4463 } 4464 4465 void addrconf_cleanup(void) 4466 { 4467 struct inet6_ifaddr *ifa; 4468 int i; 4469 4470 unregister_netdevice_notifier(&ipv6_dev_notf); 4471 unregister_pernet_device(&addrconf_net_ops); 4472 4473 unregister_pernet_subsys(&addrconf_ops); 4474 4475 rtnl_lock(); 4476 4477 /* 4478 * Check hash table. 4479 */ 4480 write_lock_bh(&addrconf_hash_lock); 4481 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4482 for (ifa=inet6_addr_lst[i]; ifa; ) { 4483 struct inet6_ifaddr *bifa; 4484 4485 bifa = ifa; 4486 ifa = ifa->lst_next; 4487 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4488 /* Do not free it; something is wrong. 4489 Now we can investigate it with debugger. 4490 */ 4491 } 4492 } 4493 write_unlock_bh(&addrconf_hash_lock); 4494 4495 del_timer(&addr_chk_timer); 4496 rtnl_unlock(); 4497 4498 unregister_pernet_subsys(&addrconf_net_ops); 4499 } 4500