1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #include <linux/errno.h> 42 #include <linux/types.h> 43 #include <linux/kernel.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #ifdef CONFIG_SYSCTL 57 #include <linux/sysctl.h> 58 #endif 59 #include <linux/capability.h> 60 #include <linux/delay.h> 61 #include <linux/notifier.h> 62 #include <linux/string.h> 63 64 #include <net/net_namespace.h> 65 #include <net/sock.h> 66 #include <net/snmp.h> 67 68 #include <net/ipv6.h> 69 #include <net/protocol.h> 70 #include <net/ndisc.h> 71 #include <net/ip6_route.h> 72 #include <net/addrconf.h> 73 #include <net/tcp.h> 74 #include <net/ip.h> 75 #include <net/netlink.h> 76 #include <net/pkt_sched.h> 77 #include <linux/if_tunnel.h> 78 #include <linux/rtnetlink.h> 79 80 #ifdef CONFIG_IPV6_PRIVACY 81 #include <linux/random.h> 82 #endif 83 84 #include <asm/uaccess.h> 85 #include <asm/unaligned.h> 86 87 #include <linux/proc_fs.h> 88 #include <linux/seq_file.h> 89 90 /* Set to 3 to get tracing... */ 91 #define ACONF_DEBUG 2 92 93 #if ACONF_DEBUG >= 3 94 #define ADBG(x) printk x 95 #else 96 #define ADBG(x) 97 #endif 98 99 #define INFINITY_LIFE_TIME 0xFFFFFFFF 100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 101 102 #ifdef CONFIG_SYSCTL 103 static void addrconf_sysctl_register(struct inet6_dev *idev); 104 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 105 #else 106 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 107 { 108 } 109 110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 111 { 112 } 113 #endif 114 115 #ifdef CONFIG_IPV6_PRIVACY 116 static int __ipv6_regen_rndid(struct inet6_dev *idev); 117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 118 static void ipv6_regen_rndid(unsigned long data); 119 120 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 121 #endif 122 123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 124 static int ipv6_count_addresses(struct inet6_dev *idev); 125 126 /* 127 * Configured unicast address hash table 128 */ 129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 130 static DEFINE_RWLOCK(addrconf_hash_lock); 131 132 static void addrconf_verify(unsigned long); 133 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 135 static DEFINE_SPINLOCK(addrconf_verify_lock); 136 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 139 140 static void addrconf_bonding_change(struct net_device *dev, 141 unsigned long event); 142 static int addrconf_ifdown(struct net_device *dev, int how); 143 144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 145 static void addrconf_dad_timer(unsigned long data); 146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 147 static void addrconf_dad_run(struct inet6_dev *idev); 148 static void addrconf_rs_timer(unsigned long data); 149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 151 152 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 153 struct prefix_info *pinfo); 154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 155 struct net_device *dev); 156 157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 158 159 static struct ipv6_devconf ipv6_devconf __read_mostly = { 160 .forwarding = 0, 161 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 162 .mtu6 = IPV6_MIN_MTU, 163 .accept_ra = 1, 164 .accept_redirects = 1, 165 .autoconf = 1, 166 .force_mld_version = 0, 167 .dad_transmits = 1, 168 .rtr_solicits = MAX_RTR_SOLICITATIONS, 169 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 170 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 171 #ifdef CONFIG_IPV6_PRIVACY 172 .use_tempaddr = 0, 173 .temp_valid_lft = TEMP_VALID_LIFETIME, 174 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 175 .regen_max_retry = REGEN_MAX_RETRY, 176 .max_desync_factor = MAX_DESYNC_FACTOR, 177 #endif 178 .max_addresses = IPV6_MAX_ADDRESSES, 179 .accept_ra_defrtr = 1, 180 .accept_ra_pinfo = 1, 181 #ifdef CONFIG_IPV6_ROUTER_PREF 182 .accept_ra_rtr_pref = 1, 183 .rtr_probe_interval = 60 * HZ, 184 #ifdef CONFIG_IPV6_ROUTE_INFO 185 .accept_ra_rt_info_max_plen = 0, 186 #endif 187 #endif 188 .proxy_ndp = 0, 189 .accept_source_route = 0, /* we do not accept RH0 by default. */ 190 .disable_ipv6 = 0, 191 .accept_dad = 1, 192 }; 193 194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 195 .forwarding = 0, 196 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 197 .mtu6 = IPV6_MIN_MTU, 198 .accept_ra = 1, 199 .accept_redirects = 1, 200 .autoconf = 1, 201 .dad_transmits = 1, 202 .rtr_solicits = MAX_RTR_SOLICITATIONS, 203 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 205 #ifdef CONFIG_IPV6_PRIVACY 206 .use_tempaddr = 0, 207 .temp_valid_lft = TEMP_VALID_LIFETIME, 208 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 209 .regen_max_retry = REGEN_MAX_RETRY, 210 .max_desync_factor = MAX_DESYNC_FACTOR, 211 #endif 212 .max_addresses = IPV6_MAX_ADDRESSES, 213 .accept_ra_defrtr = 1, 214 .accept_ra_pinfo = 1, 215 #ifdef CONFIG_IPV6_ROUTER_PREF 216 .accept_ra_rtr_pref = 1, 217 .rtr_probe_interval = 60 * HZ, 218 #ifdef CONFIG_IPV6_ROUTE_INFO 219 .accept_ra_rt_info_max_plen = 0, 220 #endif 221 #endif 222 .proxy_ndp = 0, 223 .accept_source_route = 0, /* we do not accept RH0 by default. */ 224 .disable_ipv6 = 0, 225 .accept_dad = 1, 226 }; 227 228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 233 234 /* Check if a valid qdisc is available */ 235 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 236 { 237 return !qdisc_tx_is_noop(dev); 238 } 239 240 /* Check if a route is valid prefix route */ 241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 242 { 243 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0); 244 } 245 246 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 247 { 248 if (del_timer(&ifp->timer)) 249 __in6_ifa_put(ifp); 250 } 251 252 enum addrconf_timer_t 253 { 254 AC_NONE, 255 AC_DAD, 256 AC_RS, 257 }; 258 259 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 260 enum addrconf_timer_t what, 261 unsigned long when) 262 { 263 if (!del_timer(&ifp->timer)) 264 in6_ifa_hold(ifp); 265 266 switch (what) { 267 case AC_DAD: 268 ifp->timer.function = addrconf_dad_timer; 269 break; 270 case AC_RS: 271 ifp->timer.function = addrconf_rs_timer; 272 break; 273 default:; 274 } 275 ifp->timer.expires = jiffies + when; 276 add_timer(&ifp->timer); 277 } 278 279 static int snmp6_alloc_dev(struct inet6_dev *idev) 280 { 281 if (snmp_mib_init((void **)idev->stats.ipv6, 282 sizeof(struct ipstats_mib)) < 0) 283 goto err_ip; 284 if (snmp_mib_init((void **)idev->stats.icmpv6, 285 sizeof(struct icmpv6_mib)) < 0) 286 goto err_icmp; 287 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 288 sizeof(struct icmpv6msg_mib)) < 0) 289 goto err_icmpmsg; 290 291 return 0; 292 293 err_icmpmsg: 294 snmp_mib_free((void **)idev->stats.icmpv6); 295 err_icmp: 296 snmp_mib_free((void **)idev->stats.ipv6); 297 err_ip: 298 return -ENOMEM; 299 } 300 301 static void snmp6_free_dev(struct inet6_dev *idev) 302 { 303 snmp_mib_free((void **)idev->stats.icmpv6msg); 304 snmp_mib_free((void **)idev->stats.icmpv6); 305 snmp_mib_free((void **)idev->stats.ipv6); 306 } 307 308 /* Nobody refers to this device, we may destroy it. */ 309 310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 311 { 312 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 313 kfree(idev); 314 } 315 316 void in6_dev_finish_destroy(struct inet6_dev *idev) 317 { 318 struct net_device *dev = idev->dev; 319 320 WARN_ON(idev->addr_list != NULL); 321 WARN_ON(idev->mc_list != NULL); 322 323 #ifdef NET_REFCNT_DEBUG 324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 325 #endif 326 dev_put(dev); 327 if (!idev->dead) { 328 printk("Freeing alive inet6 device %p\n", idev); 329 return; 330 } 331 snmp6_free_dev(idev); 332 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 333 } 334 335 EXPORT_SYMBOL(in6_dev_finish_destroy); 336 337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 338 { 339 struct inet6_dev *ndev; 340 341 ASSERT_RTNL(); 342 343 if (dev->mtu < IPV6_MIN_MTU) 344 return NULL; 345 346 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 347 348 if (ndev == NULL) 349 return NULL; 350 351 rwlock_init(&ndev->lock); 352 ndev->dev = dev; 353 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 354 ndev->cnf.mtu6 = dev->mtu; 355 ndev->cnf.sysctl = NULL; 356 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 357 if (ndev->nd_parms == NULL) { 358 kfree(ndev); 359 return NULL; 360 } 361 if (ndev->cnf.forwarding) 362 dev_disable_lro(dev); 363 /* We refer to the device */ 364 dev_hold(dev); 365 366 if (snmp6_alloc_dev(ndev) < 0) { 367 ADBG((KERN_WARNING 368 "%s(): cannot allocate memory for statistics; dev=%s.\n", 369 __func__, dev->name)); 370 neigh_parms_release(&nd_tbl, ndev->nd_parms); 371 ndev->dead = 1; 372 in6_dev_finish_destroy(ndev); 373 return NULL; 374 } 375 376 if (snmp6_register_dev(ndev) < 0) { 377 ADBG((KERN_WARNING 378 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 379 __func__, dev->name)); 380 neigh_parms_release(&nd_tbl, ndev->nd_parms); 381 ndev->dead = 1; 382 in6_dev_finish_destroy(ndev); 383 return NULL; 384 } 385 386 /* One reference from device. We must do this before 387 * we invoke __ipv6_regen_rndid(). 388 */ 389 in6_dev_hold(ndev); 390 391 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 392 ndev->cnf.accept_dad = -1; 393 394 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 395 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 396 printk(KERN_INFO 397 "%s: Disabled Multicast RS\n", 398 dev->name); 399 ndev->cnf.rtr_solicits = 0; 400 } 401 #endif 402 403 #ifdef CONFIG_IPV6_PRIVACY 404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 405 if ((dev->flags&IFF_LOOPBACK) || 406 dev->type == ARPHRD_TUNNEL || 407 dev->type == ARPHRD_TUNNEL6 || 408 dev->type == ARPHRD_SIT || 409 dev->type == ARPHRD_NONE) { 410 printk(KERN_INFO 411 "%s: Disabled Privacy Extensions\n", 412 dev->name); 413 ndev->cnf.use_tempaddr = -1; 414 } else { 415 in6_dev_hold(ndev); 416 ipv6_regen_rndid((unsigned long) ndev); 417 } 418 #endif 419 420 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 421 ndev->if_flags |= IF_READY; 422 423 ipv6_mc_init_dev(ndev); 424 ndev->tstamp = jiffies; 425 addrconf_sysctl_register(ndev); 426 /* protected by rtnl_lock */ 427 rcu_assign_pointer(dev->ip6_ptr, ndev); 428 429 /* Join all-node multicast group */ 430 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 431 432 return ndev; 433 } 434 435 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 436 { 437 struct inet6_dev *idev; 438 439 ASSERT_RTNL(); 440 441 if ((idev = __in6_dev_get(dev)) == NULL) { 442 if ((idev = ipv6_add_dev(dev)) == NULL) 443 return NULL; 444 } 445 446 if (dev->flags&IFF_UP) 447 ipv6_mc_up(idev); 448 return idev; 449 } 450 451 #ifdef CONFIG_SYSCTL 452 static void dev_forward_change(struct inet6_dev *idev) 453 { 454 struct net_device *dev; 455 struct inet6_ifaddr *ifa; 456 457 if (!idev) 458 return; 459 dev = idev->dev; 460 if (idev->cnf.forwarding) 461 dev_disable_lro(dev); 462 if (dev && (dev->flags & IFF_MULTICAST)) { 463 if (idev->cnf.forwarding) 464 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 465 else 466 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 467 } 468 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 469 if (ifa->flags&IFA_F_TENTATIVE) 470 continue; 471 if (idev->cnf.forwarding) 472 addrconf_join_anycast(ifa); 473 else 474 addrconf_leave_anycast(ifa); 475 } 476 } 477 478 479 static void addrconf_forward_change(struct net *net, __s32 newf) 480 { 481 struct net_device *dev; 482 struct inet6_dev *idev; 483 484 read_lock(&dev_base_lock); 485 for_each_netdev(net, dev) { 486 rcu_read_lock(); 487 idev = __in6_dev_get(dev); 488 if (idev) { 489 int changed = (!idev->cnf.forwarding) ^ (!newf); 490 idev->cnf.forwarding = newf; 491 if (changed) 492 dev_forward_change(idev); 493 } 494 rcu_read_unlock(); 495 } 496 read_unlock(&dev_base_lock); 497 } 498 499 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 500 { 501 struct net *net; 502 503 net = (struct net *)table->extra2; 504 if (p == &net->ipv6.devconf_dflt->forwarding) 505 return 0; 506 507 if (!rtnl_trylock()) 508 return restart_syscall(); 509 510 if (p == &net->ipv6.devconf_all->forwarding) { 511 __s32 newf = net->ipv6.devconf_all->forwarding; 512 net->ipv6.devconf_dflt->forwarding = newf; 513 addrconf_forward_change(net, newf); 514 } else if ((!*p) ^ (!old)) 515 dev_forward_change((struct inet6_dev *)table->extra1); 516 rtnl_unlock(); 517 518 if (*p) 519 rt6_purge_dflt_routers(net); 520 return 1; 521 } 522 #endif 523 524 /* Nobody refers to this ifaddr, destroy it */ 525 526 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 527 { 528 WARN_ON(ifp->if_next != NULL); 529 WARN_ON(ifp->lst_next != NULL); 530 531 #ifdef NET_REFCNT_DEBUG 532 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 533 #endif 534 535 in6_dev_put(ifp->idev); 536 537 if (del_timer(&ifp->timer)) 538 printk("Timer is still running, when freeing ifa=%p\n", ifp); 539 540 if (!ifp->dead) { 541 printk("Freeing alive inet6 address %p\n", ifp); 542 return; 543 } 544 dst_release(&ifp->rt->u.dst); 545 546 kfree(ifp); 547 } 548 549 static void 550 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 551 { 552 struct inet6_ifaddr *ifa, **ifap; 553 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 554 555 /* 556 * Each device address list is sorted in order of scope - 557 * global before linklocal. 558 */ 559 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 560 ifap = &ifa->if_next) { 561 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 562 break; 563 } 564 565 ifp->if_next = *ifap; 566 *ifap = ifp; 567 } 568 569 /* 570 * Hash function taken from net_alias.c 571 */ 572 static u8 ipv6_addr_hash(const struct in6_addr *addr) 573 { 574 __u32 word; 575 576 /* 577 * We perform the hash function over the last 64 bits of the address 578 * This will include the IEEE address token on links that support it. 579 */ 580 581 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 582 word ^= (word >> 16); 583 word ^= (word >> 8); 584 585 return ((word ^ (word >> 4)) & 0x0f); 586 } 587 588 /* On success it returns ifp with increased reference count */ 589 590 static struct inet6_ifaddr * 591 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 592 int scope, u32 flags) 593 { 594 struct inet6_ifaddr *ifa = NULL; 595 struct rt6_info *rt; 596 int hash; 597 int err = 0; 598 int addr_type = ipv6_addr_type(addr); 599 600 if (addr_type == IPV6_ADDR_ANY || 601 addr_type & IPV6_ADDR_MULTICAST || 602 (!(idev->dev->flags & IFF_LOOPBACK) && 603 addr_type & IPV6_ADDR_LOOPBACK)) 604 return ERR_PTR(-EADDRNOTAVAIL); 605 606 rcu_read_lock_bh(); 607 if (idev->dead) { 608 err = -ENODEV; /*XXX*/ 609 goto out2; 610 } 611 612 if (idev->cnf.disable_ipv6) { 613 err = -EACCES; 614 goto out2; 615 } 616 617 write_lock(&addrconf_hash_lock); 618 619 /* Ignore adding duplicate addresses on an interface */ 620 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 621 ADBG(("ipv6_add_addr: already assigned\n")); 622 err = -EEXIST; 623 goto out; 624 } 625 626 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 627 628 if (ifa == NULL) { 629 ADBG(("ipv6_add_addr: malloc failed\n")); 630 err = -ENOBUFS; 631 goto out; 632 } 633 634 rt = addrconf_dst_alloc(idev, addr, 0); 635 if (IS_ERR(rt)) { 636 err = PTR_ERR(rt); 637 goto out; 638 } 639 640 ipv6_addr_copy(&ifa->addr, addr); 641 642 spin_lock_init(&ifa->lock); 643 init_timer(&ifa->timer); 644 ifa->timer.data = (unsigned long) ifa; 645 ifa->scope = scope; 646 ifa->prefix_len = pfxlen; 647 ifa->flags = flags | IFA_F_TENTATIVE; 648 ifa->cstamp = ifa->tstamp = jiffies; 649 650 ifa->rt = rt; 651 652 /* 653 * part one of RFC 4429, section 3.3 654 * We should not configure an address as 655 * optimistic if we do not yet know the link 656 * layer address of our nexhop router 657 */ 658 659 if (rt->rt6i_nexthop == NULL) 660 ifa->flags &= ~IFA_F_OPTIMISTIC; 661 662 ifa->idev = idev; 663 in6_dev_hold(idev); 664 /* For caller */ 665 in6_ifa_hold(ifa); 666 667 /* Add to big hash table */ 668 hash = ipv6_addr_hash(addr); 669 670 ifa->lst_next = inet6_addr_lst[hash]; 671 inet6_addr_lst[hash] = ifa; 672 in6_ifa_hold(ifa); 673 write_unlock(&addrconf_hash_lock); 674 675 write_lock(&idev->lock); 676 /* Add to inet6_dev unicast addr list. */ 677 ipv6_link_dev_addr(idev, ifa); 678 679 #ifdef CONFIG_IPV6_PRIVACY 680 if (ifa->flags&IFA_F_TEMPORARY) { 681 ifa->tmp_next = idev->tempaddr_list; 682 idev->tempaddr_list = ifa; 683 in6_ifa_hold(ifa); 684 } 685 #endif 686 687 in6_ifa_hold(ifa); 688 write_unlock(&idev->lock); 689 out2: 690 rcu_read_unlock_bh(); 691 692 if (likely(err == 0)) 693 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 694 else { 695 kfree(ifa); 696 ifa = ERR_PTR(err); 697 } 698 699 return ifa; 700 out: 701 write_unlock(&addrconf_hash_lock); 702 goto out2; 703 } 704 705 /* This function wants to get referenced ifp and releases it before return */ 706 707 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 708 { 709 struct inet6_ifaddr *ifa, **ifap; 710 struct inet6_dev *idev = ifp->idev; 711 int hash; 712 int deleted = 0, onlink = 0; 713 unsigned long expires = jiffies; 714 715 hash = ipv6_addr_hash(&ifp->addr); 716 717 ifp->dead = 1; 718 719 write_lock_bh(&addrconf_hash_lock); 720 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 721 ifap = &ifa->lst_next) { 722 if (ifa == ifp) { 723 *ifap = ifa->lst_next; 724 __in6_ifa_put(ifp); 725 ifa->lst_next = NULL; 726 break; 727 } 728 } 729 write_unlock_bh(&addrconf_hash_lock); 730 731 write_lock_bh(&idev->lock); 732 #ifdef CONFIG_IPV6_PRIVACY 733 if (ifp->flags&IFA_F_TEMPORARY) { 734 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 735 ifap = &ifa->tmp_next) { 736 if (ifa == ifp) { 737 *ifap = ifa->tmp_next; 738 if (ifp->ifpub) { 739 in6_ifa_put(ifp->ifpub); 740 ifp->ifpub = NULL; 741 } 742 __in6_ifa_put(ifp); 743 ifa->tmp_next = NULL; 744 break; 745 } 746 } 747 } 748 #endif 749 750 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 751 if (ifa == ifp) { 752 *ifap = ifa->if_next; 753 __in6_ifa_put(ifp); 754 ifa->if_next = NULL; 755 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 756 break; 757 deleted = 1; 758 continue; 759 } else if (ifp->flags & IFA_F_PERMANENT) { 760 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 761 ifp->prefix_len)) { 762 if (ifa->flags & IFA_F_PERMANENT) { 763 onlink = 1; 764 if (deleted) 765 break; 766 } else { 767 unsigned long lifetime; 768 769 if (!onlink) 770 onlink = -1; 771 772 spin_lock(&ifa->lock); 773 774 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 775 /* 776 * Note: Because this address is 777 * not permanent, lifetime < 778 * LONG_MAX / HZ here. 779 */ 780 if (time_before(expires, 781 ifa->tstamp + lifetime * HZ)) 782 expires = ifa->tstamp + lifetime * HZ; 783 spin_unlock(&ifa->lock); 784 } 785 } 786 } 787 ifap = &ifa->if_next; 788 } 789 write_unlock_bh(&idev->lock); 790 791 addrconf_del_timer(ifp); 792 793 ipv6_ifa_notify(RTM_DELADDR, ifp); 794 795 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 796 797 /* 798 * Purge or update corresponding prefix 799 * 800 * 1) we don't purge prefix here if address was not permanent. 801 * prefix is managed by its own lifetime. 802 * 2) if there're no addresses, delete prefix. 803 * 3) if there're still other permanent address(es), 804 * corresponding prefix is still permanent. 805 * 4) otherwise, update prefix lifetime to the 806 * longest valid lifetime among the corresponding 807 * addresses on the device. 808 * Note: subsequent RA will update lifetime. 809 * 810 * --yoshfuji 811 */ 812 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 813 struct in6_addr prefix; 814 struct rt6_info *rt; 815 struct net *net = dev_net(ifp->idev->dev); 816 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 817 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 818 819 if (rt && addrconf_is_prefix_route(rt)) { 820 if (onlink == 0) { 821 ip6_del_rt(rt); 822 rt = NULL; 823 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 824 rt->rt6i_expires = expires; 825 rt->rt6i_flags |= RTF_EXPIRES; 826 } 827 } 828 dst_release(&rt->u.dst); 829 } 830 831 in6_ifa_put(ifp); 832 } 833 834 #ifdef CONFIG_IPV6_PRIVACY 835 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 836 { 837 struct inet6_dev *idev = ifp->idev; 838 struct in6_addr addr, *tmpaddr; 839 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 840 unsigned long regen_advance; 841 int tmp_plen; 842 int ret = 0; 843 int max_addresses; 844 u32 addr_flags; 845 846 write_lock(&idev->lock); 847 if (ift) { 848 spin_lock_bh(&ift->lock); 849 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 850 spin_unlock_bh(&ift->lock); 851 tmpaddr = &addr; 852 } else { 853 tmpaddr = NULL; 854 } 855 retry: 856 in6_dev_hold(idev); 857 if (idev->cnf.use_tempaddr <= 0) { 858 write_unlock(&idev->lock); 859 printk(KERN_INFO 860 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 861 in6_dev_put(idev); 862 ret = -1; 863 goto out; 864 } 865 spin_lock_bh(&ifp->lock); 866 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 867 idev->cnf.use_tempaddr = -1; /*XXX*/ 868 spin_unlock_bh(&ifp->lock); 869 write_unlock(&idev->lock); 870 printk(KERN_WARNING 871 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 872 in6_dev_put(idev); 873 ret = -1; 874 goto out; 875 } 876 in6_ifa_hold(ifp); 877 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 878 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 879 spin_unlock_bh(&ifp->lock); 880 write_unlock(&idev->lock); 881 printk(KERN_WARNING 882 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 883 in6_ifa_put(ifp); 884 in6_dev_put(idev); 885 ret = -1; 886 goto out; 887 } 888 memcpy(&addr.s6_addr[8], idev->rndid, 8); 889 tmp_valid_lft = min_t(__u32, 890 ifp->valid_lft, 891 idev->cnf.temp_valid_lft); 892 tmp_prefered_lft = min_t(__u32, 893 ifp->prefered_lft, 894 idev->cnf.temp_prefered_lft - desync_factor / HZ); 895 tmp_plen = ifp->prefix_len; 896 max_addresses = idev->cnf.max_addresses; 897 tmp_cstamp = ifp->cstamp; 898 tmp_tstamp = ifp->tstamp; 899 spin_unlock_bh(&ifp->lock); 900 901 regen_advance = idev->cnf.regen_max_retry * 902 idev->cnf.dad_transmits * 903 idev->nd_parms->retrans_time / HZ; 904 write_unlock(&idev->lock); 905 906 /* A temporary address is created only if this calculated Preferred 907 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 908 * an implementation must not create a temporary address with a zero 909 * Preferred Lifetime. 910 */ 911 if (tmp_prefered_lft <= regen_advance) { 912 in6_ifa_put(ifp); 913 in6_dev_put(idev); 914 ret = -1; 915 goto out; 916 } 917 918 addr_flags = IFA_F_TEMPORARY; 919 /* set in addrconf_prefix_rcv() */ 920 if (ifp->flags & IFA_F_OPTIMISTIC) 921 addr_flags |= IFA_F_OPTIMISTIC; 922 923 ift = !max_addresses || 924 ipv6_count_addresses(idev) < max_addresses ? 925 ipv6_add_addr(idev, &addr, tmp_plen, 926 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 927 addr_flags) : NULL; 928 if (!ift || IS_ERR(ift)) { 929 in6_ifa_put(ifp); 930 in6_dev_put(idev); 931 printk(KERN_INFO 932 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 933 tmpaddr = &addr; 934 write_lock(&idev->lock); 935 goto retry; 936 } 937 938 spin_lock_bh(&ift->lock); 939 ift->ifpub = ifp; 940 ift->valid_lft = tmp_valid_lft; 941 ift->prefered_lft = tmp_prefered_lft; 942 ift->cstamp = tmp_cstamp; 943 ift->tstamp = tmp_tstamp; 944 spin_unlock_bh(&ift->lock); 945 946 addrconf_dad_start(ift, 0); 947 in6_ifa_put(ift); 948 in6_dev_put(idev); 949 out: 950 return ret; 951 } 952 #endif 953 954 /* 955 * Choose an appropriate source address (RFC3484) 956 */ 957 enum { 958 IPV6_SADDR_RULE_INIT = 0, 959 IPV6_SADDR_RULE_LOCAL, 960 IPV6_SADDR_RULE_SCOPE, 961 IPV6_SADDR_RULE_PREFERRED, 962 #ifdef CONFIG_IPV6_MIP6 963 IPV6_SADDR_RULE_HOA, 964 #endif 965 IPV6_SADDR_RULE_OIF, 966 IPV6_SADDR_RULE_LABEL, 967 #ifdef CONFIG_IPV6_PRIVACY 968 IPV6_SADDR_RULE_PRIVACY, 969 #endif 970 IPV6_SADDR_RULE_ORCHID, 971 IPV6_SADDR_RULE_PREFIX, 972 IPV6_SADDR_RULE_MAX 973 }; 974 975 struct ipv6_saddr_score { 976 int rule; 977 int addr_type; 978 struct inet6_ifaddr *ifa; 979 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 980 int scopedist; 981 int matchlen; 982 }; 983 984 struct ipv6_saddr_dst { 985 const struct in6_addr *addr; 986 int ifindex; 987 int scope; 988 int label; 989 unsigned int prefs; 990 }; 991 992 static inline int ipv6_saddr_preferred(int type) 993 { 994 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 995 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 996 return 1; 997 return 0; 998 } 999 1000 static int ipv6_get_saddr_eval(struct net *net, 1001 struct ipv6_saddr_score *score, 1002 struct ipv6_saddr_dst *dst, 1003 int i) 1004 { 1005 int ret; 1006 1007 if (i <= score->rule) { 1008 switch (i) { 1009 case IPV6_SADDR_RULE_SCOPE: 1010 ret = score->scopedist; 1011 break; 1012 case IPV6_SADDR_RULE_PREFIX: 1013 ret = score->matchlen; 1014 break; 1015 default: 1016 ret = !!test_bit(i, score->scorebits); 1017 } 1018 goto out; 1019 } 1020 1021 switch (i) { 1022 case IPV6_SADDR_RULE_INIT: 1023 /* Rule 0: remember if hiscore is not ready yet */ 1024 ret = !!score->ifa; 1025 break; 1026 case IPV6_SADDR_RULE_LOCAL: 1027 /* Rule 1: Prefer same address */ 1028 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1029 break; 1030 case IPV6_SADDR_RULE_SCOPE: 1031 /* Rule 2: Prefer appropriate scope 1032 * 1033 * ret 1034 * ^ 1035 * -1 | d 15 1036 * ---+--+-+---> scope 1037 * | 1038 * | d is scope of the destination. 1039 * B-d | \ 1040 * | \ <- smaller scope is better if 1041 * B-15 | \ if scope is enough for destinaion. 1042 * | ret = B - scope (-1 <= scope >= d <= 15). 1043 * d-C-1 | / 1044 * |/ <- greater is better 1045 * -C / if scope is not enough for destination. 1046 * /| ret = scope - C (-1 <= d < scope <= 15). 1047 * 1048 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1049 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1050 * Assume B = 0 and we get C > 29. 1051 */ 1052 ret = __ipv6_addr_src_scope(score->addr_type); 1053 if (ret >= dst->scope) 1054 ret = -ret; 1055 else 1056 ret -= 128; /* 30 is enough */ 1057 score->scopedist = ret; 1058 break; 1059 case IPV6_SADDR_RULE_PREFERRED: 1060 /* Rule 3: Avoid deprecated and optimistic addresses */ 1061 ret = ipv6_saddr_preferred(score->addr_type) || 1062 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1063 break; 1064 #ifdef CONFIG_IPV6_MIP6 1065 case IPV6_SADDR_RULE_HOA: 1066 { 1067 /* Rule 4: Prefer home address */ 1068 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1069 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1070 break; 1071 } 1072 #endif 1073 case IPV6_SADDR_RULE_OIF: 1074 /* Rule 5: Prefer outgoing interface */ 1075 ret = (!dst->ifindex || 1076 dst->ifindex == score->ifa->idev->dev->ifindex); 1077 break; 1078 case IPV6_SADDR_RULE_LABEL: 1079 /* Rule 6: Prefer matching label */ 1080 ret = ipv6_addr_label(net, 1081 &score->ifa->addr, score->addr_type, 1082 score->ifa->idev->dev->ifindex) == dst->label; 1083 break; 1084 #ifdef CONFIG_IPV6_PRIVACY 1085 case IPV6_SADDR_RULE_PRIVACY: 1086 { 1087 /* Rule 7: Prefer public address 1088 * Note: prefer temprary address if use_tempaddr >= 2 1089 */ 1090 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1091 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1092 score->ifa->idev->cnf.use_tempaddr >= 2; 1093 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1094 break; 1095 } 1096 #endif 1097 case IPV6_SADDR_RULE_ORCHID: 1098 /* Rule 8-: Prefer ORCHID vs ORCHID or 1099 * non-ORCHID vs non-ORCHID 1100 */ 1101 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1102 ipv6_addr_orchid(dst->addr)); 1103 break; 1104 case IPV6_SADDR_RULE_PREFIX: 1105 /* Rule 8: Use longest matching prefix */ 1106 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1107 dst->addr); 1108 break; 1109 default: 1110 ret = 0; 1111 } 1112 1113 if (ret) 1114 __set_bit(i, score->scorebits); 1115 score->rule = i; 1116 out: 1117 return ret; 1118 } 1119 1120 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1121 const struct in6_addr *daddr, unsigned int prefs, 1122 struct in6_addr *saddr) 1123 { 1124 struct ipv6_saddr_score scores[2], 1125 *score = &scores[0], *hiscore = &scores[1]; 1126 struct ipv6_saddr_dst dst; 1127 struct net_device *dev; 1128 int dst_type; 1129 1130 dst_type = __ipv6_addr_type(daddr); 1131 dst.addr = daddr; 1132 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1133 dst.scope = __ipv6_addr_src_scope(dst_type); 1134 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1135 dst.prefs = prefs; 1136 1137 hiscore->rule = -1; 1138 hiscore->ifa = NULL; 1139 1140 read_lock(&dev_base_lock); 1141 rcu_read_lock(); 1142 1143 for_each_netdev(net, dev) { 1144 struct inet6_dev *idev; 1145 1146 /* Candidate Source Address (section 4) 1147 * - multicast and link-local destination address, 1148 * the set of candidate source address MUST only 1149 * include addresses assigned to interfaces 1150 * belonging to the same link as the outgoing 1151 * interface. 1152 * (- For site-local destination addresses, the 1153 * set of candidate source addresses MUST only 1154 * include addresses assigned to interfaces 1155 * belonging to the same site as the outgoing 1156 * interface.) 1157 */ 1158 if (((dst_type & IPV6_ADDR_MULTICAST) || 1159 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1160 dst.ifindex && dev->ifindex != dst.ifindex) 1161 continue; 1162 1163 idev = __in6_dev_get(dev); 1164 if (!idev) 1165 continue; 1166 1167 read_lock_bh(&idev->lock); 1168 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1169 int i; 1170 1171 /* 1172 * - Tentative Address (RFC2462 section 5.4) 1173 * - A tentative address is not considered 1174 * "assigned to an interface" in the traditional 1175 * sense, unless it is also flagged as optimistic. 1176 * - Candidate Source Address (section 4) 1177 * - In any case, anycast addresses, multicast 1178 * addresses, and the unspecified address MUST 1179 * NOT be included in a candidate set. 1180 */ 1181 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1182 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1183 continue; 1184 1185 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1186 1187 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1188 score->addr_type & IPV6_ADDR_MULTICAST)) { 1189 LIMIT_NETDEBUG(KERN_DEBUG 1190 "ADDRCONF: unspecified / multicast address " 1191 "assigned as unicast address on %s", 1192 dev->name); 1193 continue; 1194 } 1195 1196 score->rule = -1; 1197 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1198 1199 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1200 int minihiscore, miniscore; 1201 1202 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1203 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1204 1205 if (minihiscore > miniscore) { 1206 if (i == IPV6_SADDR_RULE_SCOPE && 1207 score->scopedist > 0) { 1208 /* 1209 * special case: 1210 * each remaining entry 1211 * has too small (not enough) 1212 * scope, because ifa entries 1213 * are sorted by their scope 1214 * values. 1215 */ 1216 goto try_nextdev; 1217 } 1218 break; 1219 } else if (minihiscore < miniscore) { 1220 if (hiscore->ifa) 1221 in6_ifa_put(hiscore->ifa); 1222 1223 in6_ifa_hold(score->ifa); 1224 1225 swap(hiscore, score); 1226 1227 /* restore our iterator */ 1228 score->ifa = hiscore->ifa; 1229 1230 break; 1231 } 1232 } 1233 } 1234 try_nextdev: 1235 read_unlock_bh(&idev->lock); 1236 } 1237 rcu_read_unlock(); 1238 read_unlock(&dev_base_lock); 1239 1240 if (!hiscore->ifa) 1241 return -EADDRNOTAVAIL; 1242 1243 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1244 in6_ifa_put(hiscore->ifa); 1245 return 0; 1246 } 1247 1248 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1249 1250 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1251 unsigned char banned_flags) 1252 { 1253 struct inet6_dev *idev; 1254 int err = -EADDRNOTAVAIL; 1255 1256 rcu_read_lock(); 1257 if ((idev = __in6_dev_get(dev)) != NULL) { 1258 struct inet6_ifaddr *ifp; 1259 1260 read_lock_bh(&idev->lock); 1261 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1262 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1263 ipv6_addr_copy(addr, &ifp->addr); 1264 err = 0; 1265 break; 1266 } 1267 } 1268 read_unlock_bh(&idev->lock); 1269 } 1270 rcu_read_unlock(); 1271 return err; 1272 } 1273 1274 static int ipv6_count_addresses(struct inet6_dev *idev) 1275 { 1276 int cnt = 0; 1277 struct inet6_ifaddr *ifp; 1278 1279 read_lock_bh(&idev->lock); 1280 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1281 cnt++; 1282 read_unlock_bh(&idev->lock); 1283 return cnt; 1284 } 1285 1286 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1287 struct net_device *dev, int strict) 1288 { 1289 struct inet6_ifaddr * ifp; 1290 u8 hash = ipv6_addr_hash(addr); 1291 1292 read_lock_bh(&addrconf_hash_lock); 1293 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1294 if (!net_eq(dev_net(ifp->idev->dev), net)) 1295 continue; 1296 if (ipv6_addr_equal(&ifp->addr, addr) && 1297 !(ifp->flags&IFA_F_TENTATIVE)) { 1298 if (dev == NULL || ifp->idev->dev == dev || 1299 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1300 break; 1301 } 1302 } 1303 read_unlock_bh(&addrconf_hash_lock); 1304 return ifp != NULL; 1305 } 1306 EXPORT_SYMBOL(ipv6_chk_addr); 1307 1308 static 1309 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1310 struct net_device *dev) 1311 { 1312 struct inet6_ifaddr * ifp; 1313 u8 hash = ipv6_addr_hash(addr); 1314 1315 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1316 if (!net_eq(dev_net(ifp->idev->dev), net)) 1317 continue; 1318 if (ipv6_addr_equal(&ifp->addr, addr)) { 1319 if (dev == NULL || ifp->idev->dev == dev) 1320 break; 1321 } 1322 } 1323 return ifp != NULL; 1324 } 1325 1326 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1327 { 1328 struct inet6_dev *idev; 1329 struct inet6_ifaddr *ifa; 1330 int onlink; 1331 1332 onlink = 0; 1333 rcu_read_lock(); 1334 idev = __in6_dev_get(dev); 1335 if (idev) { 1336 read_lock_bh(&idev->lock); 1337 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1338 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1339 ifa->prefix_len); 1340 if (onlink) 1341 break; 1342 } 1343 read_unlock_bh(&idev->lock); 1344 } 1345 rcu_read_unlock(); 1346 return onlink; 1347 } 1348 1349 EXPORT_SYMBOL(ipv6_chk_prefix); 1350 1351 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1352 struct net_device *dev, int strict) 1353 { 1354 struct inet6_ifaddr * ifp; 1355 u8 hash = ipv6_addr_hash(addr); 1356 1357 read_lock_bh(&addrconf_hash_lock); 1358 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1359 if (!net_eq(dev_net(ifp->idev->dev), net)) 1360 continue; 1361 if (ipv6_addr_equal(&ifp->addr, addr)) { 1362 if (dev == NULL || ifp->idev->dev == dev || 1363 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1364 in6_ifa_hold(ifp); 1365 break; 1366 } 1367 } 1368 } 1369 read_unlock_bh(&addrconf_hash_lock); 1370 1371 return ifp; 1372 } 1373 1374 /* Gets referenced address, destroys ifaddr */ 1375 1376 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1377 { 1378 if (ifp->flags&IFA_F_PERMANENT) { 1379 spin_lock_bh(&ifp->lock); 1380 addrconf_del_timer(ifp); 1381 ifp->flags |= IFA_F_TENTATIVE; 1382 if (dad_failed) 1383 ifp->flags |= IFA_F_DADFAILED; 1384 spin_unlock_bh(&ifp->lock); 1385 in6_ifa_put(ifp); 1386 #ifdef CONFIG_IPV6_PRIVACY 1387 } else if (ifp->flags&IFA_F_TEMPORARY) { 1388 struct inet6_ifaddr *ifpub; 1389 spin_lock_bh(&ifp->lock); 1390 ifpub = ifp->ifpub; 1391 if (ifpub) { 1392 in6_ifa_hold(ifpub); 1393 spin_unlock_bh(&ifp->lock); 1394 ipv6_create_tempaddr(ifpub, ifp); 1395 in6_ifa_put(ifpub); 1396 } else { 1397 spin_unlock_bh(&ifp->lock); 1398 } 1399 ipv6_del_addr(ifp); 1400 #endif 1401 } else 1402 ipv6_del_addr(ifp); 1403 } 1404 1405 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1406 { 1407 struct inet6_dev *idev = ifp->idev; 1408 1409 if (net_ratelimit()) 1410 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1411 ifp->idev->dev->name, &ifp->addr); 1412 1413 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1414 struct in6_addr addr; 1415 1416 addr.s6_addr32[0] = htonl(0xfe800000); 1417 addr.s6_addr32[1] = 0; 1418 1419 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1420 ipv6_addr_equal(&ifp->addr, &addr)) { 1421 /* DAD failed for link-local based on MAC address */ 1422 idev->cnf.disable_ipv6 = 1; 1423 1424 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1425 ifp->idev->dev->name); 1426 } 1427 } 1428 1429 addrconf_dad_stop(ifp, 1); 1430 } 1431 1432 /* Join to solicited addr multicast group. */ 1433 1434 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1435 { 1436 struct in6_addr maddr; 1437 1438 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1439 return; 1440 1441 addrconf_addr_solict_mult(addr, &maddr); 1442 ipv6_dev_mc_inc(dev, &maddr); 1443 } 1444 1445 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1446 { 1447 struct in6_addr maddr; 1448 1449 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1450 return; 1451 1452 addrconf_addr_solict_mult(addr, &maddr); 1453 __ipv6_dev_mc_dec(idev, &maddr); 1454 } 1455 1456 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1457 { 1458 struct in6_addr addr; 1459 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1460 if (ipv6_addr_any(&addr)) 1461 return; 1462 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1463 } 1464 1465 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1466 { 1467 struct in6_addr addr; 1468 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1469 if (ipv6_addr_any(&addr)) 1470 return; 1471 __ipv6_dev_ac_dec(ifp->idev, &addr); 1472 } 1473 1474 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1475 { 1476 if (dev->addr_len != ETH_ALEN) 1477 return -1; 1478 memcpy(eui, dev->dev_addr, 3); 1479 memcpy(eui + 5, dev->dev_addr + 3, 3); 1480 1481 /* 1482 * The zSeries OSA network cards can be shared among various 1483 * OS instances, but the OSA cards have only one MAC address. 1484 * This leads to duplicate address conflicts in conjunction 1485 * with IPv6 if more than one instance uses the same card. 1486 * 1487 * The driver for these cards can deliver a unique 16-bit 1488 * identifier for each instance sharing the same card. It is 1489 * placed instead of 0xFFFE in the interface identifier. The 1490 * "u" bit of the interface identifier is not inverted in this 1491 * case. Hence the resulting interface identifier has local 1492 * scope according to RFC2373. 1493 */ 1494 if (dev->dev_id) { 1495 eui[3] = (dev->dev_id >> 8) & 0xFF; 1496 eui[4] = dev->dev_id & 0xFF; 1497 } else { 1498 eui[3] = 0xFF; 1499 eui[4] = 0xFE; 1500 eui[0] ^= 2; 1501 } 1502 return 0; 1503 } 1504 1505 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1506 { 1507 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1508 if (dev->addr_len != ARCNET_ALEN) 1509 return -1; 1510 memset(eui, 0, 7); 1511 eui[7] = *(u8*)dev->dev_addr; 1512 return 0; 1513 } 1514 1515 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1516 { 1517 if (dev->addr_len != INFINIBAND_ALEN) 1518 return -1; 1519 memcpy(eui, dev->dev_addr + 12, 8); 1520 eui[0] |= 2; 1521 return 0; 1522 } 1523 1524 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1525 { 1526 if (addr == 0) 1527 return -1; 1528 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1529 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1530 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1531 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1532 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1533 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1534 eui[1] = 0; 1535 eui[2] = 0x5E; 1536 eui[3] = 0xFE; 1537 memcpy(eui + 4, &addr, 4); 1538 return 0; 1539 } 1540 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1541 1542 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1543 { 1544 if (dev->priv_flags & IFF_ISATAP) 1545 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1546 return -1; 1547 } 1548 1549 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1550 { 1551 switch (dev->type) { 1552 case ARPHRD_ETHER: 1553 case ARPHRD_FDDI: 1554 case ARPHRD_IEEE802_TR: 1555 return addrconf_ifid_eui48(eui, dev); 1556 case ARPHRD_ARCNET: 1557 return addrconf_ifid_arcnet(eui, dev); 1558 case ARPHRD_INFINIBAND: 1559 return addrconf_ifid_infiniband(eui, dev); 1560 case ARPHRD_SIT: 1561 return addrconf_ifid_sit(eui, dev); 1562 } 1563 return -1; 1564 } 1565 1566 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1567 { 1568 int err = -1; 1569 struct inet6_ifaddr *ifp; 1570 1571 read_lock_bh(&idev->lock); 1572 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1573 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1574 memcpy(eui, ifp->addr.s6_addr+8, 8); 1575 err = 0; 1576 break; 1577 } 1578 } 1579 read_unlock_bh(&idev->lock); 1580 return err; 1581 } 1582 1583 #ifdef CONFIG_IPV6_PRIVACY 1584 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1585 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1586 { 1587 regen: 1588 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1589 idev->rndid[0] &= ~0x02; 1590 1591 /* 1592 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1593 * check if generated address is not inappropriate 1594 * 1595 * - Reserved subnet anycast (RFC 2526) 1596 * 11111101 11....11 1xxxxxxx 1597 * - ISATAP (RFC4214) 6.1 1598 * 00-00-5E-FE-xx-xx-xx-xx 1599 * - value 0 1600 * - XXX: already assigned to an address on the device 1601 */ 1602 if (idev->rndid[0] == 0xfd && 1603 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1604 (idev->rndid[7]&0x80)) 1605 goto regen; 1606 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1607 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1608 goto regen; 1609 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1610 goto regen; 1611 } 1612 1613 return 0; 1614 } 1615 1616 static void ipv6_regen_rndid(unsigned long data) 1617 { 1618 struct inet6_dev *idev = (struct inet6_dev *) data; 1619 unsigned long expires; 1620 1621 rcu_read_lock_bh(); 1622 write_lock_bh(&idev->lock); 1623 1624 if (idev->dead) 1625 goto out; 1626 1627 if (__ipv6_regen_rndid(idev) < 0) 1628 goto out; 1629 1630 expires = jiffies + 1631 idev->cnf.temp_prefered_lft * HZ - 1632 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1633 if (time_before(expires, jiffies)) { 1634 printk(KERN_WARNING 1635 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1636 idev->dev->name); 1637 goto out; 1638 } 1639 1640 if (!mod_timer(&idev->regen_timer, expires)) 1641 in6_dev_hold(idev); 1642 1643 out: 1644 write_unlock_bh(&idev->lock); 1645 rcu_read_unlock_bh(); 1646 in6_dev_put(idev); 1647 } 1648 1649 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1650 int ret = 0; 1651 1652 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1653 ret = __ipv6_regen_rndid(idev); 1654 return ret; 1655 } 1656 #endif 1657 1658 /* 1659 * Add prefix route. 1660 */ 1661 1662 static void 1663 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1664 unsigned long expires, u32 flags) 1665 { 1666 struct fib6_config cfg = { 1667 .fc_table = RT6_TABLE_PREFIX, 1668 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1669 .fc_ifindex = dev->ifindex, 1670 .fc_expires = expires, 1671 .fc_dst_len = plen, 1672 .fc_flags = RTF_UP | flags, 1673 .fc_nlinfo.nl_net = dev_net(dev), 1674 .fc_protocol = RTPROT_KERNEL, 1675 }; 1676 1677 ipv6_addr_copy(&cfg.fc_dst, pfx); 1678 1679 /* Prevent useless cloning on PtP SIT. 1680 This thing is done here expecting that the whole 1681 class of non-broadcast devices need not cloning. 1682 */ 1683 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1684 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1685 cfg.fc_flags |= RTF_NONEXTHOP; 1686 #endif 1687 1688 ip6_route_add(&cfg); 1689 } 1690 1691 /* Create "default" multicast route to the interface */ 1692 1693 static void addrconf_add_mroute(struct net_device *dev) 1694 { 1695 struct fib6_config cfg = { 1696 .fc_table = RT6_TABLE_LOCAL, 1697 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1698 .fc_ifindex = dev->ifindex, 1699 .fc_dst_len = 8, 1700 .fc_flags = RTF_UP, 1701 .fc_nlinfo.nl_net = dev_net(dev), 1702 }; 1703 1704 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1705 1706 ip6_route_add(&cfg); 1707 } 1708 1709 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1710 static void sit_route_add(struct net_device *dev) 1711 { 1712 struct fib6_config cfg = { 1713 .fc_table = RT6_TABLE_MAIN, 1714 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1715 .fc_ifindex = dev->ifindex, 1716 .fc_dst_len = 96, 1717 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1718 .fc_nlinfo.nl_net = dev_net(dev), 1719 }; 1720 1721 /* prefix length - 96 bits "::d.d.d.d" */ 1722 ip6_route_add(&cfg); 1723 } 1724 #endif 1725 1726 static void addrconf_add_lroute(struct net_device *dev) 1727 { 1728 struct in6_addr addr; 1729 1730 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1731 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1732 } 1733 1734 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1735 { 1736 struct inet6_dev *idev; 1737 1738 ASSERT_RTNL(); 1739 1740 if ((idev = ipv6_find_idev(dev)) == NULL) 1741 return NULL; 1742 1743 /* Add default multicast route */ 1744 addrconf_add_mroute(dev); 1745 1746 /* Add link local route */ 1747 addrconf_add_lroute(dev); 1748 return idev; 1749 } 1750 1751 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1752 { 1753 struct prefix_info *pinfo; 1754 __u32 valid_lft; 1755 __u32 prefered_lft; 1756 int addr_type; 1757 struct inet6_dev *in6_dev; 1758 struct net *net = dev_net(dev); 1759 1760 pinfo = (struct prefix_info *) opt; 1761 1762 if (len < sizeof(struct prefix_info)) { 1763 ADBG(("addrconf: prefix option too short\n")); 1764 return; 1765 } 1766 1767 /* 1768 * Validation checks ([ADDRCONF], page 19) 1769 */ 1770 1771 addr_type = ipv6_addr_type(&pinfo->prefix); 1772 1773 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1774 return; 1775 1776 valid_lft = ntohl(pinfo->valid); 1777 prefered_lft = ntohl(pinfo->prefered); 1778 1779 if (prefered_lft > valid_lft) { 1780 if (net_ratelimit()) 1781 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1782 return; 1783 } 1784 1785 in6_dev = in6_dev_get(dev); 1786 1787 if (in6_dev == NULL) { 1788 if (net_ratelimit()) 1789 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1790 return; 1791 } 1792 1793 /* 1794 * Two things going on here: 1795 * 1) Add routes for on-link prefixes 1796 * 2) Configure prefixes with the auto flag set 1797 */ 1798 1799 if (pinfo->onlink) { 1800 struct rt6_info *rt; 1801 unsigned long rt_expires; 1802 1803 /* Avoid arithmetic overflow. Really, we could 1804 * save rt_expires in seconds, likely valid_lft, 1805 * but it would require division in fib gc, that it 1806 * not good. 1807 */ 1808 if (HZ > USER_HZ) 1809 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1810 else 1811 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1812 1813 if (addrconf_finite_timeout(rt_expires)) 1814 rt_expires *= HZ; 1815 1816 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1817 dev->ifindex, 1); 1818 1819 if (rt && addrconf_is_prefix_route(rt)) { 1820 /* Autoconf prefix route */ 1821 if (valid_lft == 0) { 1822 ip6_del_rt(rt); 1823 rt = NULL; 1824 } else if (addrconf_finite_timeout(rt_expires)) { 1825 /* not infinity */ 1826 rt->rt6i_expires = jiffies + rt_expires; 1827 rt->rt6i_flags |= RTF_EXPIRES; 1828 } else { 1829 rt->rt6i_flags &= ~RTF_EXPIRES; 1830 rt->rt6i_expires = 0; 1831 } 1832 } else if (valid_lft) { 1833 clock_t expires = 0; 1834 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1835 if (addrconf_finite_timeout(rt_expires)) { 1836 /* not infinity */ 1837 flags |= RTF_EXPIRES; 1838 expires = jiffies_to_clock_t(rt_expires); 1839 } 1840 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1841 dev, expires, flags); 1842 } 1843 if (rt) 1844 dst_release(&rt->u.dst); 1845 } 1846 1847 /* Try to figure out our local address for this prefix */ 1848 1849 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1850 struct inet6_ifaddr * ifp; 1851 struct in6_addr addr; 1852 int create = 0, update_lft = 0; 1853 1854 if (pinfo->prefix_len == 64) { 1855 memcpy(&addr, &pinfo->prefix, 8); 1856 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1857 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1858 in6_dev_put(in6_dev); 1859 return; 1860 } 1861 goto ok; 1862 } 1863 if (net_ratelimit()) 1864 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1865 pinfo->prefix_len); 1866 in6_dev_put(in6_dev); 1867 return; 1868 1869 ok: 1870 1871 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1872 1873 if (ifp == NULL && valid_lft) { 1874 int max_addresses = in6_dev->cnf.max_addresses; 1875 u32 addr_flags = 0; 1876 1877 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1878 if (in6_dev->cnf.optimistic_dad && 1879 !net->ipv6.devconf_all->forwarding) 1880 addr_flags = IFA_F_OPTIMISTIC; 1881 #endif 1882 1883 /* Do not allow to create too much of autoconfigured 1884 * addresses; this would be too easy way to crash kernel. 1885 */ 1886 if (!max_addresses || 1887 ipv6_count_addresses(in6_dev) < max_addresses) 1888 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1889 addr_type&IPV6_ADDR_SCOPE_MASK, 1890 addr_flags); 1891 1892 if (!ifp || IS_ERR(ifp)) { 1893 in6_dev_put(in6_dev); 1894 return; 1895 } 1896 1897 update_lft = create = 1; 1898 ifp->cstamp = jiffies; 1899 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1900 } 1901 1902 if (ifp) { 1903 int flags; 1904 unsigned long now; 1905 #ifdef CONFIG_IPV6_PRIVACY 1906 struct inet6_ifaddr *ift; 1907 #endif 1908 u32 stored_lft; 1909 1910 /* update lifetime (RFC2462 5.5.3 e) */ 1911 spin_lock(&ifp->lock); 1912 now = jiffies; 1913 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1914 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1915 else 1916 stored_lft = 0; 1917 if (!update_lft && stored_lft) { 1918 if (valid_lft > MIN_VALID_LIFETIME || 1919 valid_lft > stored_lft) 1920 update_lft = 1; 1921 else if (stored_lft <= MIN_VALID_LIFETIME) { 1922 /* valid_lft <= stored_lft is always true */ 1923 /* 1924 * RFC 4862 Section 5.5.3e: 1925 * "Note that the preferred lifetime of 1926 * the corresponding address is always 1927 * reset to the Preferred Lifetime in 1928 * the received Prefix Information 1929 * option, regardless of whether the 1930 * valid lifetime is also reset or 1931 * ignored." 1932 * 1933 * So if the preferred lifetime in 1934 * this advertisement is different 1935 * than what we have stored, but the 1936 * valid lifetime is invalid, just 1937 * reset prefered_lft. 1938 * 1939 * We must set the valid lifetime 1940 * to the stored lifetime since we'll 1941 * be updating the timestamp below, 1942 * else we'll set it back to the 1943 * minumum. 1944 */ 1945 if (prefered_lft != ifp->prefered_lft) { 1946 valid_lft = stored_lft; 1947 update_lft = 1; 1948 } 1949 } else { 1950 valid_lft = MIN_VALID_LIFETIME; 1951 if (valid_lft < prefered_lft) 1952 prefered_lft = valid_lft; 1953 update_lft = 1; 1954 } 1955 } 1956 1957 if (update_lft) { 1958 ifp->valid_lft = valid_lft; 1959 ifp->prefered_lft = prefered_lft; 1960 ifp->tstamp = now; 1961 flags = ifp->flags; 1962 ifp->flags &= ~IFA_F_DEPRECATED; 1963 spin_unlock(&ifp->lock); 1964 1965 if (!(flags&IFA_F_TENTATIVE)) 1966 ipv6_ifa_notify(0, ifp); 1967 } else 1968 spin_unlock(&ifp->lock); 1969 1970 #ifdef CONFIG_IPV6_PRIVACY 1971 read_lock_bh(&in6_dev->lock); 1972 /* update all temporary addresses in the list */ 1973 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1974 /* 1975 * When adjusting the lifetimes of an existing 1976 * temporary address, only lower the lifetimes. 1977 * Implementations must not increase the 1978 * lifetimes of an existing temporary address 1979 * when processing a Prefix Information Option. 1980 */ 1981 if (ifp != ift->ifpub) 1982 continue; 1983 1984 spin_lock(&ift->lock); 1985 flags = ift->flags; 1986 if (ift->valid_lft > valid_lft && 1987 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1988 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1989 if (ift->prefered_lft > prefered_lft && 1990 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1991 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1992 spin_unlock(&ift->lock); 1993 if (!(flags&IFA_F_TENTATIVE)) 1994 ipv6_ifa_notify(0, ift); 1995 } 1996 1997 if (create && in6_dev->cnf.use_tempaddr > 0) { 1998 /* 1999 * When a new public address is created as described in [ADDRCONF], 2000 * also create a new temporary address. 2001 */ 2002 read_unlock_bh(&in6_dev->lock); 2003 ipv6_create_tempaddr(ifp, NULL); 2004 } else { 2005 read_unlock_bh(&in6_dev->lock); 2006 } 2007 #endif 2008 in6_ifa_put(ifp); 2009 addrconf_verify(0); 2010 } 2011 } 2012 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2013 in6_dev_put(in6_dev); 2014 } 2015 2016 /* 2017 * Set destination address. 2018 * Special case for SIT interfaces where we create a new "virtual" 2019 * device. 2020 */ 2021 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2022 { 2023 struct in6_ifreq ireq; 2024 struct net_device *dev; 2025 int err = -EINVAL; 2026 2027 rtnl_lock(); 2028 2029 err = -EFAULT; 2030 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2031 goto err_exit; 2032 2033 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2034 2035 err = -ENODEV; 2036 if (dev == NULL) 2037 goto err_exit; 2038 2039 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2040 if (dev->type == ARPHRD_SIT) { 2041 const struct net_device_ops *ops = dev->netdev_ops; 2042 struct ifreq ifr; 2043 struct ip_tunnel_parm p; 2044 2045 err = -EADDRNOTAVAIL; 2046 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2047 goto err_exit; 2048 2049 memset(&p, 0, sizeof(p)); 2050 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2051 p.iph.saddr = 0; 2052 p.iph.version = 4; 2053 p.iph.ihl = 5; 2054 p.iph.protocol = IPPROTO_IPV6; 2055 p.iph.ttl = 64; 2056 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2057 2058 if (ops->ndo_do_ioctl) { 2059 mm_segment_t oldfs = get_fs(); 2060 2061 set_fs(KERNEL_DS); 2062 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2063 set_fs(oldfs); 2064 } else 2065 err = -EOPNOTSUPP; 2066 2067 if (err == 0) { 2068 err = -ENOBUFS; 2069 dev = __dev_get_by_name(net, p.name); 2070 if (!dev) 2071 goto err_exit; 2072 err = dev_open(dev); 2073 } 2074 } 2075 #endif 2076 2077 err_exit: 2078 rtnl_unlock(); 2079 return err; 2080 } 2081 2082 /* 2083 * Manual configuration of address on an interface 2084 */ 2085 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2086 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2087 __u32 valid_lft) 2088 { 2089 struct inet6_ifaddr *ifp; 2090 struct inet6_dev *idev; 2091 struct net_device *dev; 2092 int scope; 2093 u32 flags; 2094 clock_t expires; 2095 unsigned long timeout; 2096 2097 ASSERT_RTNL(); 2098 2099 if (plen > 128) 2100 return -EINVAL; 2101 2102 /* check the lifetime */ 2103 if (!valid_lft || prefered_lft > valid_lft) 2104 return -EINVAL; 2105 2106 dev = __dev_get_by_index(net, ifindex); 2107 if (!dev) 2108 return -ENODEV; 2109 2110 if ((idev = addrconf_add_dev(dev)) == NULL) 2111 return -ENOBUFS; 2112 2113 scope = ipv6_addr_scope(pfx); 2114 2115 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2116 if (addrconf_finite_timeout(timeout)) { 2117 expires = jiffies_to_clock_t(timeout * HZ); 2118 valid_lft = timeout; 2119 flags = RTF_EXPIRES; 2120 } else { 2121 expires = 0; 2122 flags = 0; 2123 ifa_flags |= IFA_F_PERMANENT; 2124 } 2125 2126 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2127 if (addrconf_finite_timeout(timeout)) { 2128 if (timeout == 0) 2129 ifa_flags |= IFA_F_DEPRECATED; 2130 prefered_lft = timeout; 2131 } 2132 2133 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2134 2135 if (!IS_ERR(ifp)) { 2136 spin_lock_bh(&ifp->lock); 2137 ifp->valid_lft = valid_lft; 2138 ifp->prefered_lft = prefered_lft; 2139 ifp->tstamp = jiffies; 2140 spin_unlock_bh(&ifp->lock); 2141 2142 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2143 expires, flags); 2144 /* 2145 * Note that section 3.1 of RFC 4429 indicates 2146 * that the Optimistic flag should not be set for 2147 * manually configured addresses 2148 */ 2149 addrconf_dad_start(ifp, 0); 2150 in6_ifa_put(ifp); 2151 addrconf_verify(0); 2152 return 0; 2153 } 2154 2155 return PTR_ERR(ifp); 2156 } 2157 2158 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2159 unsigned int plen) 2160 { 2161 struct inet6_ifaddr *ifp; 2162 struct inet6_dev *idev; 2163 struct net_device *dev; 2164 2165 if (plen > 128) 2166 return -EINVAL; 2167 2168 dev = __dev_get_by_index(net, ifindex); 2169 if (!dev) 2170 return -ENODEV; 2171 2172 if ((idev = __in6_dev_get(dev)) == NULL) 2173 return -ENXIO; 2174 2175 read_lock_bh(&idev->lock); 2176 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2177 if (ifp->prefix_len == plen && 2178 ipv6_addr_equal(pfx, &ifp->addr)) { 2179 in6_ifa_hold(ifp); 2180 read_unlock_bh(&idev->lock); 2181 2182 ipv6_del_addr(ifp); 2183 2184 /* If the last address is deleted administratively, 2185 disable IPv6 on this interface. 2186 */ 2187 if (idev->addr_list == NULL) 2188 addrconf_ifdown(idev->dev, 1); 2189 return 0; 2190 } 2191 } 2192 read_unlock_bh(&idev->lock); 2193 return -EADDRNOTAVAIL; 2194 } 2195 2196 2197 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2198 { 2199 struct in6_ifreq ireq; 2200 int err; 2201 2202 if (!capable(CAP_NET_ADMIN)) 2203 return -EPERM; 2204 2205 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2206 return -EFAULT; 2207 2208 rtnl_lock(); 2209 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2210 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2211 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2212 rtnl_unlock(); 2213 return err; 2214 } 2215 2216 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2217 { 2218 struct in6_ifreq ireq; 2219 int err; 2220 2221 if (!capable(CAP_NET_ADMIN)) 2222 return -EPERM; 2223 2224 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2225 return -EFAULT; 2226 2227 rtnl_lock(); 2228 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2229 ireq.ifr6_prefixlen); 2230 rtnl_unlock(); 2231 return err; 2232 } 2233 2234 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2235 int plen, int scope) 2236 { 2237 struct inet6_ifaddr *ifp; 2238 2239 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2240 if (!IS_ERR(ifp)) { 2241 spin_lock_bh(&ifp->lock); 2242 ifp->flags &= ~IFA_F_TENTATIVE; 2243 spin_unlock_bh(&ifp->lock); 2244 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2245 in6_ifa_put(ifp); 2246 } 2247 } 2248 2249 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2250 static void sit_add_v4_addrs(struct inet6_dev *idev) 2251 { 2252 struct in6_addr addr; 2253 struct net_device *dev; 2254 struct net *net = dev_net(idev->dev); 2255 int scope; 2256 2257 ASSERT_RTNL(); 2258 2259 memset(&addr, 0, sizeof(struct in6_addr)); 2260 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2261 2262 if (idev->dev->flags&IFF_POINTOPOINT) { 2263 addr.s6_addr32[0] = htonl(0xfe800000); 2264 scope = IFA_LINK; 2265 } else { 2266 scope = IPV6_ADDR_COMPATv4; 2267 } 2268 2269 if (addr.s6_addr32[3]) { 2270 add_addr(idev, &addr, 128, scope); 2271 return; 2272 } 2273 2274 for_each_netdev(net, dev) { 2275 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2276 if (in_dev && (dev->flags & IFF_UP)) { 2277 struct in_ifaddr * ifa; 2278 2279 int flag = scope; 2280 2281 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2282 int plen; 2283 2284 addr.s6_addr32[3] = ifa->ifa_local; 2285 2286 if (ifa->ifa_scope == RT_SCOPE_LINK) 2287 continue; 2288 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2289 if (idev->dev->flags&IFF_POINTOPOINT) 2290 continue; 2291 flag |= IFA_HOST; 2292 } 2293 if (idev->dev->flags&IFF_POINTOPOINT) 2294 plen = 64; 2295 else 2296 plen = 96; 2297 2298 add_addr(idev, &addr, plen, flag); 2299 } 2300 } 2301 } 2302 } 2303 #endif 2304 2305 static void init_loopback(struct net_device *dev) 2306 { 2307 struct inet6_dev *idev; 2308 2309 /* ::1 */ 2310 2311 ASSERT_RTNL(); 2312 2313 if ((idev = ipv6_find_idev(dev)) == NULL) { 2314 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2315 return; 2316 } 2317 2318 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2319 } 2320 2321 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2322 { 2323 struct inet6_ifaddr * ifp; 2324 u32 addr_flags = IFA_F_PERMANENT; 2325 2326 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2327 if (idev->cnf.optimistic_dad && 2328 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2329 addr_flags |= IFA_F_OPTIMISTIC; 2330 #endif 2331 2332 2333 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2334 if (!IS_ERR(ifp)) { 2335 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2336 addrconf_dad_start(ifp, 0); 2337 in6_ifa_put(ifp); 2338 } 2339 } 2340 2341 static void addrconf_dev_config(struct net_device *dev) 2342 { 2343 struct in6_addr addr; 2344 struct inet6_dev * idev; 2345 2346 ASSERT_RTNL(); 2347 2348 if ((dev->type != ARPHRD_ETHER) && 2349 (dev->type != ARPHRD_FDDI) && 2350 (dev->type != ARPHRD_IEEE802_TR) && 2351 (dev->type != ARPHRD_ARCNET) && 2352 (dev->type != ARPHRD_INFINIBAND)) { 2353 /* Alas, we support only Ethernet autoconfiguration. */ 2354 return; 2355 } 2356 2357 idev = addrconf_add_dev(dev); 2358 if (idev == NULL) 2359 return; 2360 2361 memset(&addr, 0, sizeof(struct in6_addr)); 2362 addr.s6_addr32[0] = htonl(0xFE800000); 2363 2364 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2365 addrconf_add_linklocal(idev, &addr); 2366 } 2367 2368 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2369 static void addrconf_sit_config(struct net_device *dev) 2370 { 2371 struct inet6_dev *idev; 2372 2373 ASSERT_RTNL(); 2374 2375 /* 2376 * Configure the tunnel with one of our IPv4 2377 * addresses... we should configure all of 2378 * our v4 addrs in the tunnel 2379 */ 2380 2381 if ((idev = ipv6_find_idev(dev)) == NULL) { 2382 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2383 return; 2384 } 2385 2386 if (dev->priv_flags & IFF_ISATAP) { 2387 struct in6_addr addr; 2388 2389 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2390 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2391 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2392 addrconf_add_linklocal(idev, &addr); 2393 return; 2394 } 2395 2396 sit_add_v4_addrs(idev); 2397 2398 if (dev->flags&IFF_POINTOPOINT) { 2399 addrconf_add_mroute(dev); 2400 addrconf_add_lroute(dev); 2401 } else 2402 sit_route_add(dev); 2403 } 2404 #endif 2405 2406 static inline int 2407 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2408 { 2409 struct in6_addr lladdr; 2410 2411 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2412 addrconf_add_linklocal(idev, &lladdr); 2413 return 0; 2414 } 2415 return -1; 2416 } 2417 2418 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2419 { 2420 struct net_device *link_dev; 2421 struct net *net = dev_net(idev->dev); 2422 2423 /* first try to inherit the link-local address from the link device */ 2424 if (idev->dev->iflink && 2425 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2426 if (!ipv6_inherit_linklocal(idev, link_dev)) 2427 return; 2428 } 2429 /* then try to inherit it from any device */ 2430 for_each_netdev(net, link_dev) { 2431 if (!ipv6_inherit_linklocal(idev, link_dev)) 2432 return; 2433 } 2434 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2435 } 2436 2437 /* 2438 * Autoconfigure tunnel with a link-local address so routing protocols, 2439 * DHCPv6, MLD etc. can be run over the virtual link 2440 */ 2441 2442 static void addrconf_ip6_tnl_config(struct net_device *dev) 2443 { 2444 struct inet6_dev *idev; 2445 2446 ASSERT_RTNL(); 2447 2448 if ((idev = addrconf_add_dev(dev)) == NULL) { 2449 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2450 return; 2451 } 2452 ip6_tnl_add_linklocal(idev); 2453 } 2454 2455 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2456 void * data) 2457 { 2458 struct net_device *dev = (struct net_device *) data; 2459 struct inet6_dev *idev = __in6_dev_get(dev); 2460 int run_pending = 0; 2461 int err; 2462 2463 switch(event) { 2464 case NETDEV_REGISTER: 2465 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2466 idev = ipv6_add_dev(dev); 2467 if (!idev) 2468 return notifier_from_errno(-ENOMEM); 2469 } 2470 break; 2471 case NETDEV_UP: 2472 case NETDEV_CHANGE: 2473 if (dev->flags & IFF_SLAVE) 2474 break; 2475 2476 if (event == NETDEV_UP) { 2477 if (!addrconf_qdisc_ok(dev)) { 2478 /* device is not ready yet. */ 2479 printk(KERN_INFO 2480 "ADDRCONF(NETDEV_UP): %s: " 2481 "link is not ready\n", 2482 dev->name); 2483 break; 2484 } 2485 2486 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2487 idev = ipv6_add_dev(dev); 2488 2489 if (idev) { 2490 idev->if_flags |= IF_READY; 2491 run_pending = 1; 2492 } 2493 } else { 2494 if (!addrconf_qdisc_ok(dev)) { 2495 /* device is still not ready. */ 2496 break; 2497 } 2498 2499 if (idev) { 2500 if (idev->if_flags & IF_READY) { 2501 /* device is already configured. */ 2502 break; 2503 } 2504 idev->if_flags |= IF_READY; 2505 } 2506 2507 printk(KERN_INFO 2508 "ADDRCONF(NETDEV_CHANGE): %s: " 2509 "link becomes ready\n", 2510 dev->name); 2511 2512 run_pending = 1; 2513 } 2514 2515 switch(dev->type) { 2516 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2517 case ARPHRD_SIT: 2518 addrconf_sit_config(dev); 2519 break; 2520 #endif 2521 case ARPHRD_TUNNEL6: 2522 addrconf_ip6_tnl_config(dev); 2523 break; 2524 case ARPHRD_LOOPBACK: 2525 init_loopback(dev); 2526 break; 2527 2528 default: 2529 addrconf_dev_config(dev); 2530 break; 2531 } 2532 if (idev) { 2533 if (run_pending) 2534 addrconf_dad_run(idev); 2535 2536 /* If the MTU changed during the interface down, when the 2537 interface up, the changed MTU must be reflected in the 2538 idev as well as routers. 2539 */ 2540 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2541 rt6_mtu_change(dev, dev->mtu); 2542 idev->cnf.mtu6 = dev->mtu; 2543 } 2544 idev->tstamp = jiffies; 2545 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2546 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2547 stop IPv6 on this interface. 2548 */ 2549 if (dev->mtu < IPV6_MIN_MTU) 2550 addrconf_ifdown(dev, event != NETDEV_DOWN); 2551 } 2552 break; 2553 2554 case NETDEV_CHANGEMTU: 2555 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2556 rt6_mtu_change(dev, dev->mtu); 2557 idev->cnf.mtu6 = dev->mtu; 2558 break; 2559 } 2560 2561 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2562 idev = ipv6_add_dev(dev); 2563 if (idev) 2564 break; 2565 } 2566 2567 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2568 2569 case NETDEV_DOWN: 2570 case NETDEV_UNREGISTER: 2571 /* 2572 * Remove all addresses from this interface. 2573 */ 2574 addrconf_ifdown(dev, event != NETDEV_DOWN); 2575 break; 2576 2577 case NETDEV_CHANGENAME: 2578 if (idev) { 2579 snmp6_unregister_dev(idev); 2580 addrconf_sysctl_unregister(idev); 2581 addrconf_sysctl_register(idev); 2582 err = snmp6_register_dev(idev); 2583 if (err) 2584 return notifier_from_errno(err); 2585 } 2586 break; 2587 case NETDEV_BONDING_OLDTYPE: 2588 case NETDEV_BONDING_NEWTYPE: 2589 addrconf_bonding_change(dev, event); 2590 break; 2591 } 2592 2593 return NOTIFY_OK; 2594 } 2595 2596 /* 2597 * addrconf module should be notified of a device going up 2598 */ 2599 static struct notifier_block ipv6_dev_notf = { 2600 .notifier_call = addrconf_notify, 2601 .priority = 0 2602 }; 2603 2604 static void addrconf_bonding_change(struct net_device *dev, unsigned long event) 2605 { 2606 struct inet6_dev *idev; 2607 ASSERT_RTNL(); 2608 2609 idev = __in6_dev_get(dev); 2610 2611 if (event == NETDEV_BONDING_NEWTYPE) 2612 ipv6_mc_remap(idev); 2613 else if (event == NETDEV_BONDING_OLDTYPE) 2614 ipv6_mc_unmap(idev); 2615 } 2616 2617 static int addrconf_ifdown(struct net_device *dev, int how) 2618 { 2619 struct inet6_dev *idev; 2620 struct inet6_ifaddr *ifa, **bifa; 2621 struct net *net = dev_net(dev); 2622 int i; 2623 2624 ASSERT_RTNL(); 2625 2626 rt6_ifdown(net, dev); 2627 neigh_ifdown(&nd_tbl, dev); 2628 2629 idev = __in6_dev_get(dev); 2630 if (idev == NULL) 2631 return -ENODEV; 2632 2633 /* Step 1: remove reference to ipv6 device from parent device. 2634 Do not dev_put! 2635 */ 2636 if (how) { 2637 idev->dead = 1; 2638 2639 /* protected by rtnl_lock */ 2640 rcu_assign_pointer(dev->ip6_ptr, NULL); 2641 2642 /* Step 1.5: remove snmp6 entry */ 2643 snmp6_unregister_dev(idev); 2644 2645 } 2646 2647 /* Step 2: clear hash table */ 2648 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2649 bifa = &inet6_addr_lst[i]; 2650 2651 write_lock_bh(&addrconf_hash_lock); 2652 while ((ifa = *bifa) != NULL) { 2653 if (ifa->idev == idev) { 2654 *bifa = ifa->lst_next; 2655 ifa->lst_next = NULL; 2656 addrconf_del_timer(ifa); 2657 in6_ifa_put(ifa); 2658 continue; 2659 } 2660 bifa = &ifa->lst_next; 2661 } 2662 write_unlock_bh(&addrconf_hash_lock); 2663 } 2664 2665 write_lock_bh(&idev->lock); 2666 2667 /* Step 3: clear flags for stateless addrconf */ 2668 if (!how) 2669 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2670 2671 /* Step 4: clear address list */ 2672 #ifdef CONFIG_IPV6_PRIVACY 2673 if (how && del_timer(&idev->regen_timer)) 2674 in6_dev_put(idev); 2675 2676 /* clear tempaddr list */ 2677 while ((ifa = idev->tempaddr_list) != NULL) { 2678 idev->tempaddr_list = ifa->tmp_next; 2679 ifa->tmp_next = NULL; 2680 ifa->dead = 1; 2681 write_unlock_bh(&idev->lock); 2682 spin_lock_bh(&ifa->lock); 2683 2684 if (ifa->ifpub) { 2685 in6_ifa_put(ifa->ifpub); 2686 ifa->ifpub = NULL; 2687 } 2688 spin_unlock_bh(&ifa->lock); 2689 in6_ifa_put(ifa); 2690 write_lock_bh(&idev->lock); 2691 } 2692 #endif 2693 while ((ifa = idev->addr_list) != NULL) { 2694 idev->addr_list = ifa->if_next; 2695 ifa->if_next = NULL; 2696 ifa->dead = 1; 2697 addrconf_del_timer(ifa); 2698 write_unlock_bh(&idev->lock); 2699 2700 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2701 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2702 in6_ifa_put(ifa); 2703 2704 write_lock_bh(&idev->lock); 2705 } 2706 write_unlock_bh(&idev->lock); 2707 2708 /* Step 5: Discard multicast list */ 2709 2710 if (how) 2711 ipv6_mc_destroy_dev(idev); 2712 else 2713 ipv6_mc_down(idev); 2714 2715 idev->tstamp = jiffies; 2716 2717 /* Shot the device (if unregistered) */ 2718 2719 if (how) { 2720 addrconf_sysctl_unregister(idev); 2721 neigh_parms_release(&nd_tbl, idev->nd_parms); 2722 neigh_ifdown(&nd_tbl, dev); 2723 in6_dev_put(idev); 2724 } 2725 return 0; 2726 } 2727 2728 static void addrconf_rs_timer(unsigned long data) 2729 { 2730 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2731 2732 if (ifp->idev->cnf.forwarding) 2733 goto out; 2734 2735 if (ifp->idev->if_flags & IF_RA_RCVD) { 2736 /* 2737 * Announcement received after solicitation 2738 * was sent 2739 */ 2740 goto out; 2741 } 2742 2743 spin_lock(&ifp->lock); 2744 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2745 /* The wait after the last probe can be shorter */ 2746 addrconf_mod_timer(ifp, AC_RS, 2747 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2748 ifp->idev->cnf.rtr_solicit_delay : 2749 ifp->idev->cnf.rtr_solicit_interval); 2750 spin_unlock(&ifp->lock); 2751 2752 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2753 } else { 2754 spin_unlock(&ifp->lock); 2755 /* 2756 * Note: we do not support deprecated "all on-link" 2757 * assumption any longer. 2758 */ 2759 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2760 ifp->idev->dev->name); 2761 } 2762 2763 out: 2764 in6_ifa_put(ifp); 2765 } 2766 2767 /* 2768 * Duplicate Address Detection 2769 */ 2770 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2771 { 2772 unsigned long rand_num; 2773 struct inet6_dev *idev = ifp->idev; 2774 2775 if (ifp->flags & IFA_F_OPTIMISTIC) 2776 rand_num = 0; 2777 else 2778 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2779 2780 ifp->probes = idev->cnf.dad_transmits; 2781 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2782 } 2783 2784 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2785 { 2786 struct inet6_dev *idev = ifp->idev; 2787 struct net_device *dev = idev->dev; 2788 2789 addrconf_join_solict(dev, &ifp->addr); 2790 2791 net_srandom(ifp->addr.s6_addr32[3]); 2792 2793 read_lock_bh(&idev->lock); 2794 if (ifp->dead) 2795 goto out; 2796 spin_lock_bh(&ifp->lock); 2797 2798 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2799 idev->cnf.accept_dad < 1 || 2800 !(ifp->flags&IFA_F_TENTATIVE) || 2801 ifp->flags & IFA_F_NODAD) { 2802 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2803 spin_unlock_bh(&ifp->lock); 2804 read_unlock_bh(&idev->lock); 2805 2806 addrconf_dad_completed(ifp); 2807 return; 2808 } 2809 2810 if (!(idev->if_flags & IF_READY)) { 2811 spin_unlock_bh(&ifp->lock); 2812 read_unlock_bh(&idev->lock); 2813 /* 2814 * If the device is not ready: 2815 * - keep it tentative if it is a permanent address. 2816 * - otherwise, kill it. 2817 */ 2818 in6_ifa_hold(ifp); 2819 addrconf_dad_stop(ifp, 0); 2820 return; 2821 } 2822 2823 /* 2824 * Optimistic nodes can start receiving 2825 * Frames right away 2826 */ 2827 if(ifp->flags & IFA_F_OPTIMISTIC) 2828 ip6_ins_rt(ifp->rt); 2829 2830 addrconf_dad_kick(ifp); 2831 spin_unlock_bh(&ifp->lock); 2832 out: 2833 read_unlock_bh(&idev->lock); 2834 } 2835 2836 static void addrconf_dad_timer(unsigned long data) 2837 { 2838 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2839 struct inet6_dev *idev = ifp->idev; 2840 struct in6_addr mcaddr; 2841 2842 read_lock_bh(&idev->lock); 2843 if (idev->dead) { 2844 read_unlock_bh(&idev->lock); 2845 goto out; 2846 } 2847 spin_lock_bh(&ifp->lock); 2848 if (ifp->probes == 0) { 2849 /* 2850 * DAD was successful 2851 */ 2852 2853 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2854 spin_unlock_bh(&ifp->lock); 2855 read_unlock_bh(&idev->lock); 2856 2857 addrconf_dad_completed(ifp); 2858 2859 goto out; 2860 } 2861 2862 ifp->probes--; 2863 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2864 spin_unlock_bh(&ifp->lock); 2865 read_unlock_bh(&idev->lock); 2866 2867 /* send a neighbour solicitation for our addr */ 2868 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2869 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2870 out: 2871 in6_ifa_put(ifp); 2872 } 2873 2874 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2875 { 2876 struct net_device * dev = ifp->idev->dev; 2877 2878 /* 2879 * Configure the address for reception. Now it is valid. 2880 */ 2881 2882 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2883 2884 /* If added prefix is link local and forwarding is off, 2885 start sending router solicitations. 2886 */ 2887 2888 if (ifp->idev->cnf.forwarding == 0 && 2889 ifp->idev->cnf.rtr_solicits > 0 && 2890 (dev->flags&IFF_LOOPBACK) == 0 && 2891 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2892 /* 2893 * If a host as already performed a random delay 2894 * [...] as part of DAD [...] there is no need 2895 * to delay again before sending the first RS 2896 */ 2897 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2898 2899 spin_lock_bh(&ifp->lock); 2900 ifp->probes = 1; 2901 ifp->idev->if_flags |= IF_RS_SENT; 2902 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2903 spin_unlock_bh(&ifp->lock); 2904 } 2905 } 2906 2907 static void addrconf_dad_run(struct inet6_dev *idev) { 2908 struct inet6_ifaddr *ifp; 2909 2910 read_lock_bh(&idev->lock); 2911 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2912 spin_lock_bh(&ifp->lock); 2913 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2914 spin_unlock_bh(&ifp->lock); 2915 continue; 2916 } 2917 spin_unlock_bh(&ifp->lock); 2918 addrconf_dad_kick(ifp); 2919 } 2920 read_unlock_bh(&idev->lock); 2921 } 2922 2923 #ifdef CONFIG_PROC_FS 2924 struct if6_iter_state { 2925 struct seq_net_private p; 2926 int bucket; 2927 }; 2928 2929 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2930 { 2931 struct inet6_ifaddr *ifa = NULL; 2932 struct if6_iter_state *state = seq->private; 2933 struct net *net = seq_file_net(seq); 2934 2935 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2936 ifa = inet6_addr_lst[state->bucket]; 2937 2938 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2939 ifa = ifa->lst_next; 2940 if (ifa) 2941 break; 2942 } 2943 return ifa; 2944 } 2945 2946 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2947 { 2948 struct if6_iter_state *state = seq->private; 2949 struct net *net = seq_file_net(seq); 2950 2951 ifa = ifa->lst_next; 2952 try_again: 2953 if (ifa) { 2954 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2955 ifa = ifa->lst_next; 2956 goto try_again; 2957 } 2958 } 2959 2960 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2961 ifa = inet6_addr_lst[state->bucket]; 2962 goto try_again; 2963 } 2964 2965 return ifa; 2966 } 2967 2968 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2969 { 2970 struct inet6_ifaddr *ifa = if6_get_first(seq); 2971 2972 if (ifa) 2973 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2974 --pos; 2975 return pos ? NULL : ifa; 2976 } 2977 2978 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2979 __acquires(addrconf_hash_lock) 2980 { 2981 read_lock_bh(&addrconf_hash_lock); 2982 return if6_get_idx(seq, *pos); 2983 } 2984 2985 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2986 { 2987 struct inet6_ifaddr *ifa; 2988 2989 ifa = if6_get_next(seq, v); 2990 ++*pos; 2991 return ifa; 2992 } 2993 2994 static void if6_seq_stop(struct seq_file *seq, void *v) 2995 __releases(addrconf_hash_lock) 2996 { 2997 read_unlock_bh(&addrconf_hash_lock); 2998 } 2999 3000 static int if6_seq_show(struct seq_file *seq, void *v) 3001 { 3002 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3003 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3004 &ifp->addr, 3005 ifp->idev->dev->ifindex, 3006 ifp->prefix_len, 3007 ifp->scope, 3008 ifp->flags, 3009 ifp->idev->dev->name); 3010 return 0; 3011 } 3012 3013 static const struct seq_operations if6_seq_ops = { 3014 .start = if6_seq_start, 3015 .next = if6_seq_next, 3016 .show = if6_seq_show, 3017 .stop = if6_seq_stop, 3018 }; 3019 3020 static int if6_seq_open(struct inode *inode, struct file *file) 3021 { 3022 return seq_open_net(inode, file, &if6_seq_ops, 3023 sizeof(struct if6_iter_state)); 3024 } 3025 3026 static const struct file_operations if6_fops = { 3027 .owner = THIS_MODULE, 3028 .open = if6_seq_open, 3029 .read = seq_read, 3030 .llseek = seq_lseek, 3031 .release = seq_release_net, 3032 }; 3033 3034 static int if6_proc_net_init(struct net *net) 3035 { 3036 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3037 return -ENOMEM; 3038 return 0; 3039 } 3040 3041 static void if6_proc_net_exit(struct net *net) 3042 { 3043 proc_net_remove(net, "if_inet6"); 3044 } 3045 3046 static struct pernet_operations if6_proc_net_ops = { 3047 .init = if6_proc_net_init, 3048 .exit = if6_proc_net_exit, 3049 }; 3050 3051 int __init if6_proc_init(void) 3052 { 3053 return register_pernet_subsys(&if6_proc_net_ops); 3054 } 3055 3056 void if6_proc_exit(void) 3057 { 3058 unregister_pernet_subsys(&if6_proc_net_ops); 3059 } 3060 #endif /* CONFIG_PROC_FS */ 3061 3062 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3063 /* Check if address is a home address configured on any interface. */ 3064 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3065 { 3066 int ret = 0; 3067 struct inet6_ifaddr * ifp; 3068 u8 hash = ipv6_addr_hash(addr); 3069 read_lock_bh(&addrconf_hash_lock); 3070 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 3071 if (!net_eq(dev_net(ifp->idev->dev), net)) 3072 continue; 3073 if (ipv6_addr_equal(&ifp->addr, addr) && 3074 (ifp->flags & IFA_F_HOMEADDRESS)) { 3075 ret = 1; 3076 break; 3077 } 3078 } 3079 read_unlock_bh(&addrconf_hash_lock); 3080 return ret; 3081 } 3082 #endif 3083 3084 /* 3085 * Periodic address status verification 3086 */ 3087 3088 static void addrconf_verify(unsigned long foo) 3089 { 3090 struct inet6_ifaddr *ifp; 3091 unsigned long now, next; 3092 int i; 3093 3094 spin_lock_bh(&addrconf_verify_lock); 3095 now = jiffies; 3096 next = now + ADDR_CHECK_FREQUENCY; 3097 3098 del_timer(&addr_chk_timer); 3099 3100 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3101 3102 restart: 3103 read_lock(&addrconf_hash_lock); 3104 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3105 unsigned long age; 3106 #ifdef CONFIG_IPV6_PRIVACY 3107 unsigned long regen_advance; 3108 #endif 3109 3110 if (ifp->flags & IFA_F_PERMANENT) 3111 continue; 3112 3113 spin_lock(&ifp->lock); 3114 age = (now - ifp->tstamp) / HZ; 3115 3116 #ifdef CONFIG_IPV6_PRIVACY 3117 regen_advance = ifp->idev->cnf.regen_max_retry * 3118 ifp->idev->cnf.dad_transmits * 3119 ifp->idev->nd_parms->retrans_time / HZ; 3120 #endif 3121 3122 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3123 age >= ifp->valid_lft) { 3124 spin_unlock(&ifp->lock); 3125 in6_ifa_hold(ifp); 3126 read_unlock(&addrconf_hash_lock); 3127 ipv6_del_addr(ifp); 3128 goto restart; 3129 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3130 spin_unlock(&ifp->lock); 3131 continue; 3132 } else if (age >= ifp->prefered_lft) { 3133 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3134 int deprecate = 0; 3135 3136 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3137 deprecate = 1; 3138 ifp->flags |= IFA_F_DEPRECATED; 3139 } 3140 3141 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3142 next = ifp->tstamp + ifp->valid_lft * HZ; 3143 3144 spin_unlock(&ifp->lock); 3145 3146 if (deprecate) { 3147 in6_ifa_hold(ifp); 3148 read_unlock(&addrconf_hash_lock); 3149 3150 ipv6_ifa_notify(0, ifp); 3151 in6_ifa_put(ifp); 3152 goto restart; 3153 } 3154 #ifdef CONFIG_IPV6_PRIVACY 3155 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3156 !(ifp->flags&IFA_F_TENTATIVE)) { 3157 if (age >= ifp->prefered_lft - regen_advance) { 3158 struct inet6_ifaddr *ifpub = ifp->ifpub; 3159 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3160 next = ifp->tstamp + ifp->prefered_lft * HZ; 3161 if (!ifp->regen_count && ifpub) { 3162 ifp->regen_count++; 3163 in6_ifa_hold(ifp); 3164 in6_ifa_hold(ifpub); 3165 spin_unlock(&ifp->lock); 3166 read_unlock(&addrconf_hash_lock); 3167 spin_lock(&ifpub->lock); 3168 ifpub->regen_count = 0; 3169 spin_unlock(&ifpub->lock); 3170 ipv6_create_tempaddr(ifpub, ifp); 3171 in6_ifa_put(ifpub); 3172 in6_ifa_put(ifp); 3173 goto restart; 3174 } 3175 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3176 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3177 spin_unlock(&ifp->lock); 3178 #endif 3179 } else { 3180 /* ifp->prefered_lft <= ifp->valid_lft */ 3181 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3182 next = ifp->tstamp + ifp->prefered_lft * HZ; 3183 spin_unlock(&ifp->lock); 3184 } 3185 } 3186 read_unlock(&addrconf_hash_lock); 3187 } 3188 3189 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3190 add_timer(&addr_chk_timer); 3191 spin_unlock_bh(&addrconf_verify_lock); 3192 } 3193 3194 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3195 { 3196 struct in6_addr *pfx = NULL; 3197 3198 if (addr) 3199 pfx = nla_data(addr); 3200 3201 if (local) { 3202 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3203 pfx = NULL; 3204 else 3205 pfx = nla_data(local); 3206 } 3207 3208 return pfx; 3209 } 3210 3211 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3212 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3213 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3214 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3215 }; 3216 3217 static int 3218 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3219 { 3220 struct net *net = sock_net(skb->sk); 3221 struct ifaddrmsg *ifm; 3222 struct nlattr *tb[IFA_MAX+1]; 3223 struct in6_addr *pfx; 3224 int err; 3225 3226 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3227 if (err < 0) 3228 return err; 3229 3230 ifm = nlmsg_data(nlh); 3231 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3232 if (pfx == NULL) 3233 return -EINVAL; 3234 3235 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3236 } 3237 3238 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3239 u32 prefered_lft, u32 valid_lft) 3240 { 3241 u32 flags; 3242 clock_t expires; 3243 unsigned long timeout; 3244 3245 if (!valid_lft || (prefered_lft > valid_lft)) 3246 return -EINVAL; 3247 3248 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3249 if (addrconf_finite_timeout(timeout)) { 3250 expires = jiffies_to_clock_t(timeout * HZ); 3251 valid_lft = timeout; 3252 flags = RTF_EXPIRES; 3253 } else { 3254 expires = 0; 3255 flags = 0; 3256 ifa_flags |= IFA_F_PERMANENT; 3257 } 3258 3259 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3260 if (addrconf_finite_timeout(timeout)) { 3261 if (timeout == 0) 3262 ifa_flags |= IFA_F_DEPRECATED; 3263 prefered_lft = timeout; 3264 } 3265 3266 spin_lock_bh(&ifp->lock); 3267 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3268 ifp->tstamp = jiffies; 3269 ifp->valid_lft = valid_lft; 3270 ifp->prefered_lft = prefered_lft; 3271 3272 spin_unlock_bh(&ifp->lock); 3273 if (!(ifp->flags&IFA_F_TENTATIVE)) 3274 ipv6_ifa_notify(0, ifp); 3275 3276 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3277 expires, flags); 3278 addrconf_verify(0); 3279 3280 return 0; 3281 } 3282 3283 static int 3284 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3285 { 3286 struct net *net = sock_net(skb->sk); 3287 struct ifaddrmsg *ifm; 3288 struct nlattr *tb[IFA_MAX+1]; 3289 struct in6_addr *pfx; 3290 struct inet6_ifaddr *ifa; 3291 struct net_device *dev; 3292 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3293 u8 ifa_flags; 3294 int err; 3295 3296 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3297 if (err < 0) 3298 return err; 3299 3300 ifm = nlmsg_data(nlh); 3301 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3302 if (pfx == NULL) 3303 return -EINVAL; 3304 3305 if (tb[IFA_CACHEINFO]) { 3306 struct ifa_cacheinfo *ci; 3307 3308 ci = nla_data(tb[IFA_CACHEINFO]); 3309 valid_lft = ci->ifa_valid; 3310 preferred_lft = ci->ifa_prefered; 3311 } else { 3312 preferred_lft = INFINITY_LIFE_TIME; 3313 valid_lft = INFINITY_LIFE_TIME; 3314 } 3315 3316 dev = __dev_get_by_index(net, ifm->ifa_index); 3317 if (dev == NULL) 3318 return -ENODEV; 3319 3320 /* We ignore other flags so far. */ 3321 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3322 3323 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3324 if (ifa == NULL) { 3325 /* 3326 * It would be best to check for !NLM_F_CREATE here but 3327 * userspace alreay relies on not having to provide this. 3328 */ 3329 return inet6_addr_add(net, ifm->ifa_index, pfx, 3330 ifm->ifa_prefixlen, ifa_flags, 3331 preferred_lft, valid_lft); 3332 } 3333 3334 if (nlh->nlmsg_flags & NLM_F_EXCL || 3335 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3336 err = -EEXIST; 3337 else 3338 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3339 3340 in6_ifa_put(ifa); 3341 3342 return err; 3343 } 3344 3345 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3346 u8 scope, int ifindex) 3347 { 3348 struct ifaddrmsg *ifm; 3349 3350 ifm = nlmsg_data(nlh); 3351 ifm->ifa_family = AF_INET6; 3352 ifm->ifa_prefixlen = prefixlen; 3353 ifm->ifa_flags = flags; 3354 ifm->ifa_scope = scope; 3355 ifm->ifa_index = ifindex; 3356 } 3357 3358 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3359 unsigned long tstamp, u32 preferred, u32 valid) 3360 { 3361 struct ifa_cacheinfo ci; 3362 3363 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3364 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3365 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3366 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3367 ci.ifa_prefered = preferred; 3368 ci.ifa_valid = valid; 3369 3370 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3371 } 3372 3373 static inline int rt_scope(int ifa_scope) 3374 { 3375 if (ifa_scope & IFA_HOST) 3376 return RT_SCOPE_HOST; 3377 else if (ifa_scope & IFA_LINK) 3378 return RT_SCOPE_LINK; 3379 else if (ifa_scope & IFA_SITE) 3380 return RT_SCOPE_SITE; 3381 else 3382 return RT_SCOPE_UNIVERSE; 3383 } 3384 3385 static inline int inet6_ifaddr_msgsize(void) 3386 { 3387 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3388 + nla_total_size(16) /* IFA_ADDRESS */ 3389 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3390 } 3391 3392 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3393 u32 pid, u32 seq, int event, unsigned int flags) 3394 { 3395 struct nlmsghdr *nlh; 3396 u32 preferred, valid; 3397 3398 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3399 if (nlh == NULL) 3400 return -EMSGSIZE; 3401 3402 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3403 ifa->idev->dev->ifindex); 3404 3405 if (!(ifa->flags&IFA_F_PERMANENT)) { 3406 preferred = ifa->prefered_lft; 3407 valid = ifa->valid_lft; 3408 if (preferred != INFINITY_LIFE_TIME) { 3409 long tval = (jiffies - ifa->tstamp)/HZ; 3410 if (preferred > tval) 3411 preferred -= tval; 3412 else 3413 preferred = 0; 3414 if (valid != INFINITY_LIFE_TIME) 3415 valid -= tval; 3416 } 3417 } else { 3418 preferred = INFINITY_LIFE_TIME; 3419 valid = INFINITY_LIFE_TIME; 3420 } 3421 3422 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3423 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3424 nlmsg_cancel(skb, nlh); 3425 return -EMSGSIZE; 3426 } 3427 3428 return nlmsg_end(skb, nlh); 3429 } 3430 3431 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3432 u32 pid, u32 seq, int event, u16 flags) 3433 { 3434 struct nlmsghdr *nlh; 3435 u8 scope = RT_SCOPE_UNIVERSE; 3436 int ifindex = ifmca->idev->dev->ifindex; 3437 3438 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3439 scope = RT_SCOPE_SITE; 3440 3441 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3442 if (nlh == NULL) 3443 return -EMSGSIZE; 3444 3445 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3446 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3447 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3448 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3449 nlmsg_cancel(skb, nlh); 3450 return -EMSGSIZE; 3451 } 3452 3453 return nlmsg_end(skb, nlh); 3454 } 3455 3456 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3457 u32 pid, u32 seq, int event, unsigned int flags) 3458 { 3459 struct nlmsghdr *nlh; 3460 u8 scope = RT_SCOPE_UNIVERSE; 3461 int ifindex = ifaca->aca_idev->dev->ifindex; 3462 3463 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3464 scope = RT_SCOPE_SITE; 3465 3466 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3467 if (nlh == NULL) 3468 return -EMSGSIZE; 3469 3470 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3471 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3472 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3473 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3474 nlmsg_cancel(skb, nlh); 3475 return -EMSGSIZE; 3476 } 3477 3478 return nlmsg_end(skb, nlh); 3479 } 3480 3481 enum addr_type_t 3482 { 3483 UNICAST_ADDR, 3484 MULTICAST_ADDR, 3485 ANYCAST_ADDR, 3486 }; 3487 3488 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3489 enum addr_type_t type) 3490 { 3491 int idx, ip_idx; 3492 int s_idx, s_ip_idx; 3493 int err = 1; 3494 struct net_device *dev; 3495 struct inet6_dev *idev = NULL; 3496 struct inet6_ifaddr *ifa; 3497 struct ifmcaddr6 *ifmca; 3498 struct ifacaddr6 *ifaca; 3499 struct net *net = sock_net(skb->sk); 3500 3501 s_idx = cb->args[0]; 3502 s_ip_idx = ip_idx = cb->args[1]; 3503 3504 idx = 0; 3505 for_each_netdev(net, dev) { 3506 if (idx < s_idx) 3507 goto cont; 3508 if (idx > s_idx) 3509 s_ip_idx = 0; 3510 ip_idx = 0; 3511 if ((idev = in6_dev_get(dev)) == NULL) 3512 goto cont; 3513 read_lock_bh(&idev->lock); 3514 switch (type) { 3515 case UNICAST_ADDR: 3516 /* unicast address incl. temp addr */ 3517 for (ifa = idev->addr_list; ifa; 3518 ifa = ifa->if_next, ip_idx++) { 3519 if (ip_idx < s_ip_idx) 3520 continue; 3521 err = inet6_fill_ifaddr(skb, ifa, 3522 NETLINK_CB(cb->skb).pid, 3523 cb->nlh->nlmsg_seq, 3524 RTM_NEWADDR, 3525 NLM_F_MULTI); 3526 } 3527 break; 3528 case MULTICAST_ADDR: 3529 /* multicast address */ 3530 for (ifmca = idev->mc_list; ifmca; 3531 ifmca = ifmca->next, ip_idx++) { 3532 if (ip_idx < s_ip_idx) 3533 continue; 3534 err = inet6_fill_ifmcaddr(skb, ifmca, 3535 NETLINK_CB(cb->skb).pid, 3536 cb->nlh->nlmsg_seq, 3537 RTM_GETMULTICAST, 3538 NLM_F_MULTI); 3539 } 3540 break; 3541 case ANYCAST_ADDR: 3542 /* anycast address */ 3543 for (ifaca = idev->ac_list; ifaca; 3544 ifaca = ifaca->aca_next, ip_idx++) { 3545 if (ip_idx < s_ip_idx) 3546 continue; 3547 err = inet6_fill_ifacaddr(skb, ifaca, 3548 NETLINK_CB(cb->skb).pid, 3549 cb->nlh->nlmsg_seq, 3550 RTM_GETANYCAST, 3551 NLM_F_MULTI); 3552 } 3553 break; 3554 default: 3555 break; 3556 } 3557 read_unlock_bh(&idev->lock); 3558 in6_dev_put(idev); 3559 3560 if (err <= 0) 3561 break; 3562 cont: 3563 idx++; 3564 } 3565 cb->args[0] = idx; 3566 cb->args[1] = ip_idx; 3567 return skb->len; 3568 } 3569 3570 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3571 { 3572 enum addr_type_t type = UNICAST_ADDR; 3573 3574 return inet6_dump_addr(skb, cb, type); 3575 } 3576 3577 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3578 { 3579 enum addr_type_t type = MULTICAST_ADDR; 3580 3581 return inet6_dump_addr(skb, cb, type); 3582 } 3583 3584 3585 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3586 { 3587 enum addr_type_t type = ANYCAST_ADDR; 3588 3589 return inet6_dump_addr(skb, cb, type); 3590 } 3591 3592 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3593 void *arg) 3594 { 3595 struct net *net = sock_net(in_skb->sk); 3596 struct ifaddrmsg *ifm; 3597 struct nlattr *tb[IFA_MAX+1]; 3598 struct in6_addr *addr = NULL; 3599 struct net_device *dev = NULL; 3600 struct inet6_ifaddr *ifa; 3601 struct sk_buff *skb; 3602 int err; 3603 3604 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3605 if (err < 0) 3606 goto errout; 3607 3608 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3609 if (addr == NULL) { 3610 err = -EINVAL; 3611 goto errout; 3612 } 3613 3614 ifm = nlmsg_data(nlh); 3615 if (ifm->ifa_index) 3616 dev = __dev_get_by_index(net, ifm->ifa_index); 3617 3618 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3619 err = -EADDRNOTAVAIL; 3620 goto errout; 3621 } 3622 3623 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3624 err = -ENOBUFS; 3625 goto errout_ifa; 3626 } 3627 3628 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3629 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3630 if (err < 0) { 3631 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3632 WARN_ON(err == -EMSGSIZE); 3633 kfree_skb(skb); 3634 goto errout_ifa; 3635 } 3636 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3637 errout_ifa: 3638 in6_ifa_put(ifa); 3639 errout: 3640 return err; 3641 } 3642 3643 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3644 { 3645 struct sk_buff *skb; 3646 struct net *net = dev_net(ifa->idev->dev); 3647 int err = -ENOBUFS; 3648 3649 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3650 if (skb == NULL) 3651 goto errout; 3652 3653 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3654 if (err < 0) { 3655 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3656 WARN_ON(err == -EMSGSIZE); 3657 kfree_skb(skb); 3658 goto errout; 3659 } 3660 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3661 return; 3662 errout: 3663 if (err < 0) 3664 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3665 } 3666 3667 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3668 __s32 *array, int bytes) 3669 { 3670 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3671 3672 memset(array, 0, bytes); 3673 array[DEVCONF_FORWARDING] = cnf->forwarding; 3674 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3675 array[DEVCONF_MTU6] = cnf->mtu6; 3676 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3677 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3678 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3679 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3680 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3681 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3682 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3683 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3684 #ifdef CONFIG_IPV6_PRIVACY 3685 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3686 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3687 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3688 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3689 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3690 #endif 3691 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3692 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3693 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3694 #ifdef CONFIG_IPV6_ROUTER_PREF 3695 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3696 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3697 #ifdef CONFIG_IPV6_ROUTE_INFO 3698 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3699 #endif 3700 #endif 3701 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3702 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3703 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3704 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3705 #endif 3706 #ifdef CONFIG_IPV6_MROUTE 3707 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3708 #endif 3709 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3710 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3711 } 3712 3713 static inline size_t inet6_if_nlmsg_size(void) 3714 { 3715 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3716 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3717 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3718 + nla_total_size(4) /* IFLA_MTU */ 3719 + nla_total_size(4) /* IFLA_LINK */ 3720 + nla_total_size( /* IFLA_PROTINFO */ 3721 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3722 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3723 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3724 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3725 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3726 ); 3727 } 3728 3729 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3730 int bytes) 3731 { 3732 int i; 3733 int pad = bytes - sizeof(u64) * items; 3734 BUG_ON(pad < 0); 3735 3736 /* Use put_unaligned() because stats may not be aligned for u64. */ 3737 put_unaligned(items, &stats[0]); 3738 for (i = 1; i < items; i++) 3739 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3740 3741 memset(&stats[items], 0, pad); 3742 } 3743 3744 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3745 int bytes) 3746 { 3747 switch(attrtype) { 3748 case IFLA_INET6_STATS: 3749 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3750 break; 3751 case IFLA_INET6_ICMP6STATS: 3752 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3753 break; 3754 } 3755 } 3756 3757 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3758 u32 pid, u32 seq, int event, unsigned int flags) 3759 { 3760 struct net_device *dev = idev->dev; 3761 struct nlattr *nla; 3762 struct ifinfomsg *hdr; 3763 struct nlmsghdr *nlh; 3764 void *protoinfo; 3765 struct ifla_cacheinfo ci; 3766 3767 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3768 if (nlh == NULL) 3769 return -EMSGSIZE; 3770 3771 hdr = nlmsg_data(nlh); 3772 hdr->ifi_family = AF_INET6; 3773 hdr->__ifi_pad = 0; 3774 hdr->ifi_type = dev->type; 3775 hdr->ifi_index = dev->ifindex; 3776 hdr->ifi_flags = dev_get_flags(dev); 3777 hdr->ifi_change = 0; 3778 3779 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3780 3781 if (dev->addr_len) 3782 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3783 3784 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3785 if (dev->ifindex != dev->iflink) 3786 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3787 3788 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3789 if (protoinfo == NULL) 3790 goto nla_put_failure; 3791 3792 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3793 3794 ci.max_reasm_len = IPV6_MAXPLEN; 3795 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3796 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3797 ci.reachable_time = idev->nd_parms->reachable_time; 3798 ci.retrans_time = idev->nd_parms->retrans_time; 3799 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3800 3801 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3802 if (nla == NULL) 3803 goto nla_put_failure; 3804 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3805 3806 /* XXX - MC not implemented */ 3807 3808 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3809 if (nla == NULL) 3810 goto nla_put_failure; 3811 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3812 3813 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3814 if (nla == NULL) 3815 goto nla_put_failure; 3816 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3817 3818 nla_nest_end(skb, protoinfo); 3819 return nlmsg_end(skb, nlh); 3820 3821 nla_put_failure: 3822 nlmsg_cancel(skb, nlh); 3823 return -EMSGSIZE; 3824 } 3825 3826 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3827 { 3828 struct net *net = sock_net(skb->sk); 3829 int idx, err; 3830 int s_idx = cb->args[0]; 3831 struct net_device *dev; 3832 struct inet6_dev *idev; 3833 3834 read_lock(&dev_base_lock); 3835 idx = 0; 3836 for_each_netdev(net, dev) { 3837 if (idx < s_idx) 3838 goto cont; 3839 if ((idev = in6_dev_get(dev)) == NULL) 3840 goto cont; 3841 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3842 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3843 in6_dev_put(idev); 3844 if (err <= 0) 3845 break; 3846 cont: 3847 idx++; 3848 } 3849 read_unlock(&dev_base_lock); 3850 cb->args[0] = idx; 3851 3852 return skb->len; 3853 } 3854 3855 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3856 { 3857 struct sk_buff *skb; 3858 struct net *net = dev_net(idev->dev); 3859 int err = -ENOBUFS; 3860 3861 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3862 if (skb == NULL) 3863 goto errout; 3864 3865 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3866 if (err < 0) { 3867 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3868 WARN_ON(err == -EMSGSIZE); 3869 kfree_skb(skb); 3870 goto errout; 3871 } 3872 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3873 return; 3874 errout: 3875 if (err < 0) 3876 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3877 } 3878 3879 static inline size_t inet6_prefix_nlmsg_size(void) 3880 { 3881 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3882 + nla_total_size(sizeof(struct in6_addr)) 3883 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3884 } 3885 3886 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3887 struct prefix_info *pinfo, u32 pid, u32 seq, 3888 int event, unsigned int flags) 3889 { 3890 struct prefixmsg *pmsg; 3891 struct nlmsghdr *nlh; 3892 struct prefix_cacheinfo ci; 3893 3894 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3895 if (nlh == NULL) 3896 return -EMSGSIZE; 3897 3898 pmsg = nlmsg_data(nlh); 3899 pmsg->prefix_family = AF_INET6; 3900 pmsg->prefix_pad1 = 0; 3901 pmsg->prefix_pad2 = 0; 3902 pmsg->prefix_ifindex = idev->dev->ifindex; 3903 pmsg->prefix_len = pinfo->prefix_len; 3904 pmsg->prefix_type = pinfo->type; 3905 pmsg->prefix_pad3 = 0; 3906 pmsg->prefix_flags = 0; 3907 if (pinfo->onlink) 3908 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3909 if (pinfo->autoconf) 3910 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3911 3912 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3913 3914 ci.preferred_time = ntohl(pinfo->prefered); 3915 ci.valid_time = ntohl(pinfo->valid); 3916 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3917 3918 return nlmsg_end(skb, nlh); 3919 3920 nla_put_failure: 3921 nlmsg_cancel(skb, nlh); 3922 return -EMSGSIZE; 3923 } 3924 3925 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3926 struct prefix_info *pinfo) 3927 { 3928 struct sk_buff *skb; 3929 struct net *net = dev_net(idev->dev); 3930 int err = -ENOBUFS; 3931 3932 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3933 if (skb == NULL) 3934 goto errout; 3935 3936 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3937 if (err < 0) { 3938 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3939 WARN_ON(err == -EMSGSIZE); 3940 kfree_skb(skb); 3941 goto errout; 3942 } 3943 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3944 return; 3945 errout: 3946 if (err < 0) 3947 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3948 } 3949 3950 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3951 { 3952 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3953 3954 switch (event) { 3955 case RTM_NEWADDR: 3956 /* 3957 * If the address was optimistic 3958 * we inserted the route at the start of 3959 * our DAD process, so we don't need 3960 * to do it again 3961 */ 3962 if (!(ifp->rt->rt6i_node)) 3963 ip6_ins_rt(ifp->rt); 3964 if (ifp->idev->cnf.forwarding) 3965 addrconf_join_anycast(ifp); 3966 break; 3967 case RTM_DELADDR: 3968 if (ifp->idev->cnf.forwarding) 3969 addrconf_leave_anycast(ifp); 3970 addrconf_leave_solict(ifp->idev, &ifp->addr); 3971 dst_hold(&ifp->rt->u.dst); 3972 if (ip6_del_rt(ifp->rt)) 3973 dst_free(&ifp->rt->u.dst); 3974 break; 3975 } 3976 } 3977 3978 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3979 { 3980 rcu_read_lock_bh(); 3981 if (likely(ifp->idev->dead == 0)) 3982 __ipv6_ifa_notify(event, ifp); 3983 rcu_read_unlock_bh(); 3984 } 3985 3986 #ifdef CONFIG_SYSCTL 3987 3988 static 3989 int addrconf_sysctl_forward(ctl_table *ctl, int write, 3990 void __user *buffer, size_t *lenp, loff_t *ppos) 3991 { 3992 int *valp = ctl->data; 3993 int val = *valp; 3994 int ret; 3995 3996 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 3997 3998 if (write) 3999 ret = addrconf_fixup_forwarding(ctl, valp, val); 4000 return ret; 4001 } 4002 4003 static int addrconf_sysctl_forward_strategy(ctl_table *table, 4004 void __user *oldval, 4005 size_t __user *oldlenp, 4006 void __user *newval, size_t newlen) 4007 { 4008 int *valp = table->data; 4009 int val = *valp; 4010 int new; 4011 4012 if (!newval || !newlen) 4013 return 0; 4014 if (newlen != sizeof(int)) 4015 return -EINVAL; 4016 if (get_user(new, (int __user *)newval)) 4017 return -EFAULT; 4018 if (new == *valp) 4019 return 0; 4020 if (oldval && oldlenp) { 4021 size_t len; 4022 if (get_user(len, oldlenp)) 4023 return -EFAULT; 4024 if (len) { 4025 if (len > table->maxlen) 4026 len = table->maxlen; 4027 if (copy_to_user(oldval, valp, len)) 4028 return -EFAULT; 4029 if (put_user(len, oldlenp)) 4030 return -EFAULT; 4031 } 4032 } 4033 4034 *valp = new; 4035 return addrconf_fixup_forwarding(table, valp, val); 4036 } 4037 4038 static void dev_disable_change(struct inet6_dev *idev) 4039 { 4040 if (!idev || !idev->dev) 4041 return; 4042 4043 if (idev->cnf.disable_ipv6) 4044 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4045 else 4046 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4047 } 4048 4049 static void addrconf_disable_change(struct net *net, __s32 newf) 4050 { 4051 struct net_device *dev; 4052 struct inet6_dev *idev; 4053 4054 read_lock(&dev_base_lock); 4055 for_each_netdev(net, dev) { 4056 rcu_read_lock(); 4057 idev = __in6_dev_get(dev); 4058 if (idev) { 4059 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4060 idev->cnf.disable_ipv6 = newf; 4061 if (changed) 4062 dev_disable_change(idev); 4063 } 4064 rcu_read_unlock(); 4065 } 4066 read_unlock(&dev_base_lock); 4067 } 4068 4069 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4070 { 4071 struct net *net; 4072 4073 net = (struct net *)table->extra2; 4074 4075 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4076 return 0; 4077 4078 if (!rtnl_trylock()) 4079 return restart_syscall(); 4080 4081 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4082 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4083 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4084 addrconf_disable_change(net, newf); 4085 } else if ((!*p) ^ (!old)) 4086 dev_disable_change((struct inet6_dev *)table->extra1); 4087 4088 rtnl_unlock(); 4089 return 0; 4090 } 4091 4092 static 4093 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4094 void __user *buffer, size_t *lenp, loff_t *ppos) 4095 { 4096 int *valp = ctl->data; 4097 int val = *valp; 4098 int ret; 4099 4100 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4101 4102 if (write) 4103 ret = addrconf_disable_ipv6(ctl, valp, val); 4104 return ret; 4105 } 4106 4107 static struct addrconf_sysctl_table 4108 { 4109 struct ctl_table_header *sysctl_header; 4110 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4111 char *dev_name; 4112 } addrconf_sysctl __read_mostly = { 4113 .sysctl_header = NULL, 4114 .addrconf_vars = { 4115 { 4116 .ctl_name = NET_IPV6_FORWARDING, 4117 .procname = "forwarding", 4118 .data = &ipv6_devconf.forwarding, 4119 .maxlen = sizeof(int), 4120 .mode = 0644, 4121 .proc_handler = addrconf_sysctl_forward, 4122 .strategy = addrconf_sysctl_forward_strategy, 4123 }, 4124 { 4125 .ctl_name = NET_IPV6_HOP_LIMIT, 4126 .procname = "hop_limit", 4127 .data = &ipv6_devconf.hop_limit, 4128 .maxlen = sizeof(int), 4129 .mode = 0644, 4130 .proc_handler = proc_dointvec, 4131 }, 4132 { 4133 .ctl_name = NET_IPV6_MTU, 4134 .procname = "mtu", 4135 .data = &ipv6_devconf.mtu6, 4136 .maxlen = sizeof(int), 4137 .mode = 0644, 4138 .proc_handler = proc_dointvec, 4139 }, 4140 { 4141 .ctl_name = NET_IPV6_ACCEPT_RA, 4142 .procname = "accept_ra", 4143 .data = &ipv6_devconf.accept_ra, 4144 .maxlen = sizeof(int), 4145 .mode = 0644, 4146 .proc_handler = proc_dointvec, 4147 }, 4148 { 4149 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 4150 .procname = "accept_redirects", 4151 .data = &ipv6_devconf.accept_redirects, 4152 .maxlen = sizeof(int), 4153 .mode = 0644, 4154 .proc_handler = proc_dointvec, 4155 }, 4156 { 4157 .ctl_name = NET_IPV6_AUTOCONF, 4158 .procname = "autoconf", 4159 .data = &ipv6_devconf.autoconf, 4160 .maxlen = sizeof(int), 4161 .mode = 0644, 4162 .proc_handler = proc_dointvec, 4163 }, 4164 { 4165 .ctl_name = NET_IPV6_DAD_TRANSMITS, 4166 .procname = "dad_transmits", 4167 .data = &ipv6_devconf.dad_transmits, 4168 .maxlen = sizeof(int), 4169 .mode = 0644, 4170 .proc_handler = proc_dointvec, 4171 }, 4172 { 4173 .ctl_name = NET_IPV6_RTR_SOLICITS, 4174 .procname = "router_solicitations", 4175 .data = &ipv6_devconf.rtr_solicits, 4176 .maxlen = sizeof(int), 4177 .mode = 0644, 4178 .proc_handler = proc_dointvec, 4179 }, 4180 { 4181 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 4182 .procname = "router_solicitation_interval", 4183 .data = &ipv6_devconf.rtr_solicit_interval, 4184 .maxlen = sizeof(int), 4185 .mode = 0644, 4186 .proc_handler = proc_dointvec_jiffies, 4187 .strategy = sysctl_jiffies, 4188 }, 4189 { 4190 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 4191 .procname = "router_solicitation_delay", 4192 .data = &ipv6_devconf.rtr_solicit_delay, 4193 .maxlen = sizeof(int), 4194 .mode = 0644, 4195 .proc_handler = proc_dointvec_jiffies, 4196 .strategy = sysctl_jiffies, 4197 }, 4198 { 4199 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 4200 .procname = "force_mld_version", 4201 .data = &ipv6_devconf.force_mld_version, 4202 .maxlen = sizeof(int), 4203 .mode = 0644, 4204 .proc_handler = proc_dointvec, 4205 }, 4206 #ifdef CONFIG_IPV6_PRIVACY 4207 { 4208 .ctl_name = NET_IPV6_USE_TEMPADDR, 4209 .procname = "use_tempaddr", 4210 .data = &ipv6_devconf.use_tempaddr, 4211 .maxlen = sizeof(int), 4212 .mode = 0644, 4213 .proc_handler = proc_dointvec, 4214 }, 4215 { 4216 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 4217 .procname = "temp_valid_lft", 4218 .data = &ipv6_devconf.temp_valid_lft, 4219 .maxlen = sizeof(int), 4220 .mode = 0644, 4221 .proc_handler = proc_dointvec, 4222 }, 4223 { 4224 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 4225 .procname = "temp_prefered_lft", 4226 .data = &ipv6_devconf.temp_prefered_lft, 4227 .maxlen = sizeof(int), 4228 .mode = 0644, 4229 .proc_handler = proc_dointvec, 4230 }, 4231 { 4232 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4233 .procname = "regen_max_retry", 4234 .data = &ipv6_devconf.regen_max_retry, 4235 .maxlen = sizeof(int), 4236 .mode = 0644, 4237 .proc_handler = proc_dointvec, 4238 }, 4239 { 4240 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4241 .procname = "max_desync_factor", 4242 .data = &ipv6_devconf.max_desync_factor, 4243 .maxlen = sizeof(int), 4244 .mode = 0644, 4245 .proc_handler = proc_dointvec, 4246 }, 4247 #endif 4248 { 4249 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4250 .procname = "max_addresses", 4251 .data = &ipv6_devconf.max_addresses, 4252 .maxlen = sizeof(int), 4253 .mode = 0644, 4254 .proc_handler = proc_dointvec, 4255 }, 4256 { 4257 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4258 .procname = "accept_ra_defrtr", 4259 .data = &ipv6_devconf.accept_ra_defrtr, 4260 .maxlen = sizeof(int), 4261 .mode = 0644, 4262 .proc_handler = proc_dointvec, 4263 }, 4264 { 4265 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4266 .procname = "accept_ra_pinfo", 4267 .data = &ipv6_devconf.accept_ra_pinfo, 4268 .maxlen = sizeof(int), 4269 .mode = 0644, 4270 .proc_handler = proc_dointvec, 4271 }, 4272 #ifdef CONFIG_IPV6_ROUTER_PREF 4273 { 4274 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4275 .procname = "accept_ra_rtr_pref", 4276 .data = &ipv6_devconf.accept_ra_rtr_pref, 4277 .maxlen = sizeof(int), 4278 .mode = 0644, 4279 .proc_handler = proc_dointvec, 4280 }, 4281 { 4282 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4283 .procname = "router_probe_interval", 4284 .data = &ipv6_devconf.rtr_probe_interval, 4285 .maxlen = sizeof(int), 4286 .mode = 0644, 4287 .proc_handler = proc_dointvec_jiffies, 4288 .strategy = sysctl_jiffies, 4289 }, 4290 #ifdef CONFIG_IPV6_ROUTE_INFO 4291 { 4292 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4293 .procname = "accept_ra_rt_info_max_plen", 4294 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4295 .maxlen = sizeof(int), 4296 .mode = 0644, 4297 .proc_handler = proc_dointvec, 4298 }, 4299 #endif 4300 #endif 4301 { 4302 .ctl_name = NET_IPV6_PROXY_NDP, 4303 .procname = "proxy_ndp", 4304 .data = &ipv6_devconf.proxy_ndp, 4305 .maxlen = sizeof(int), 4306 .mode = 0644, 4307 .proc_handler = proc_dointvec, 4308 }, 4309 { 4310 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4311 .procname = "accept_source_route", 4312 .data = &ipv6_devconf.accept_source_route, 4313 .maxlen = sizeof(int), 4314 .mode = 0644, 4315 .proc_handler = proc_dointvec, 4316 }, 4317 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4318 { 4319 .ctl_name = CTL_UNNUMBERED, 4320 .procname = "optimistic_dad", 4321 .data = &ipv6_devconf.optimistic_dad, 4322 .maxlen = sizeof(int), 4323 .mode = 0644, 4324 .proc_handler = proc_dointvec, 4325 4326 }, 4327 #endif 4328 #ifdef CONFIG_IPV6_MROUTE 4329 { 4330 .ctl_name = CTL_UNNUMBERED, 4331 .procname = "mc_forwarding", 4332 .data = &ipv6_devconf.mc_forwarding, 4333 .maxlen = sizeof(int), 4334 .mode = 0444, 4335 .proc_handler = proc_dointvec, 4336 }, 4337 #endif 4338 { 4339 .ctl_name = CTL_UNNUMBERED, 4340 .procname = "disable_ipv6", 4341 .data = &ipv6_devconf.disable_ipv6, 4342 .maxlen = sizeof(int), 4343 .mode = 0644, 4344 .proc_handler = addrconf_sysctl_disable, 4345 .strategy = sysctl_intvec, 4346 }, 4347 { 4348 .ctl_name = CTL_UNNUMBERED, 4349 .procname = "accept_dad", 4350 .data = &ipv6_devconf.accept_dad, 4351 .maxlen = sizeof(int), 4352 .mode = 0644, 4353 .proc_handler = proc_dointvec, 4354 }, 4355 { 4356 .ctl_name = 0, /* sentinel */ 4357 } 4358 }, 4359 }; 4360 4361 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4362 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4363 { 4364 int i; 4365 struct addrconf_sysctl_table *t; 4366 4367 #define ADDRCONF_CTL_PATH_DEV 3 4368 4369 struct ctl_path addrconf_ctl_path[] = { 4370 { .procname = "net", .ctl_name = CTL_NET, }, 4371 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4372 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4373 { /* to be set */ }, 4374 { }, 4375 }; 4376 4377 4378 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4379 if (t == NULL) 4380 goto out; 4381 4382 for (i=0; t->addrconf_vars[i].data; i++) { 4383 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4384 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4385 t->addrconf_vars[i].extra2 = net; 4386 } 4387 4388 /* 4389 * Make a copy of dev_name, because '.procname' is regarded as const 4390 * by sysctl and we wouldn't want anyone to change it under our feet 4391 * (see SIOCSIFNAME). 4392 */ 4393 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4394 if (!t->dev_name) 4395 goto free; 4396 4397 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4398 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4399 4400 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4401 t->addrconf_vars); 4402 if (t->sysctl_header == NULL) 4403 goto free_procname; 4404 4405 p->sysctl = t; 4406 return 0; 4407 4408 free_procname: 4409 kfree(t->dev_name); 4410 free: 4411 kfree(t); 4412 out: 4413 return -ENOBUFS; 4414 } 4415 4416 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4417 { 4418 struct addrconf_sysctl_table *t; 4419 4420 if (p->sysctl == NULL) 4421 return; 4422 4423 t = p->sysctl; 4424 p->sysctl = NULL; 4425 unregister_sysctl_table(t->sysctl_header); 4426 kfree(t->dev_name); 4427 kfree(t); 4428 } 4429 4430 static void addrconf_sysctl_register(struct inet6_dev *idev) 4431 { 4432 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4433 NET_IPV6_NEIGH, "ipv6", 4434 &ndisc_ifinfo_sysctl_change, 4435 ndisc_ifinfo_sysctl_strategy); 4436 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4437 idev->dev->ifindex, idev, &idev->cnf); 4438 } 4439 4440 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4441 { 4442 __addrconf_sysctl_unregister(&idev->cnf); 4443 neigh_sysctl_unregister(idev->nd_parms); 4444 } 4445 4446 4447 #endif 4448 4449 static int addrconf_init_net(struct net *net) 4450 { 4451 int err; 4452 struct ipv6_devconf *all, *dflt; 4453 4454 err = -ENOMEM; 4455 all = &ipv6_devconf; 4456 dflt = &ipv6_devconf_dflt; 4457 4458 if (net != &init_net) { 4459 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4460 if (all == NULL) 4461 goto err_alloc_all; 4462 4463 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4464 if (dflt == NULL) 4465 goto err_alloc_dflt; 4466 } else { 4467 /* these will be inherited by all namespaces */ 4468 dflt->autoconf = ipv6_defaults.autoconf; 4469 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4470 } 4471 4472 net->ipv6.devconf_all = all; 4473 net->ipv6.devconf_dflt = dflt; 4474 4475 #ifdef CONFIG_SYSCTL 4476 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4477 NULL, all); 4478 if (err < 0) 4479 goto err_reg_all; 4480 4481 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4482 NULL, dflt); 4483 if (err < 0) 4484 goto err_reg_dflt; 4485 #endif 4486 return 0; 4487 4488 #ifdef CONFIG_SYSCTL 4489 err_reg_dflt: 4490 __addrconf_sysctl_unregister(all); 4491 err_reg_all: 4492 kfree(dflt); 4493 #endif 4494 err_alloc_dflt: 4495 kfree(all); 4496 err_alloc_all: 4497 return err; 4498 } 4499 4500 static void addrconf_exit_net(struct net *net) 4501 { 4502 #ifdef CONFIG_SYSCTL 4503 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4504 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4505 #endif 4506 if (net != &init_net) { 4507 kfree(net->ipv6.devconf_dflt); 4508 kfree(net->ipv6.devconf_all); 4509 } 4510 } 4511 4512 static struct pernet_operations addrconf_ops = { 4513 .init = addrconf_init_net, 4514 .exit = addrconf_exit_net, 4515 }; 4516 4517 /* 4518 * Device notifier 4519 */ 4520 4521 int register_inet6addr_notifier(struct notifier_block *nb) 4522 { 4523 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4524 } 4525 4526 EXPORT_SYMBOL(register_inet6addr_notifier); 4527 4528 int unregister_inet6addr_notifier(struct notifier_block *nb) 4529 { 4530 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4531 } 4532 4533 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4534 4535 /* 4536 * Init / cleanup code 4537 */ 4538 4539 int __init addrconf_init(void) 4540 { 4541 int err; 4542 4543 if ((err = ipv6_addr_label_init()) < 0) { 4544 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4545 err); 4546 return err; 4547 } 4548 4549 register_pernet_subsys(&addrconf_ops); 4550 4551 /* The addrconf netdev notifier requires that loopback_dev 4552 * has it's ipv6 private information allocated and setup 4553 * before it can bring up and give link-local addresses 4554 * to other devices which are up. 4555 * 4556 * Unfortunately, loopback_dev is not necessarily the first 4557 * entry in the global dev_base list of net devices. In fact, 4558 * it is likely to be the very last entry on that list. 4559 * So this causes the notifier registry below to try and 4560 * give link-local addresses to all devices besides loopback_dev 4561 * first, then loopback_dev, which cases all the non-loopback_dev 4562 * devices to fail to get a link-local address. 4563 * 4564 * So, as a temporary fix, allocate the ipv6 structure for 4565 * loopback_dev first by hand. 4566 * Longer term, all of the dependencies ipv6 has upon the loopback 4567 * device and it being up should be removed. 4568 */ 4569 rtnl_lock(); 4570 if (!ipv6_add_dev(init_net.loopback_dev)) 4571 err = -ENOMEM; 4572 rtnl_unlock(); 4573 if (err) 4574 goto errlo; 4575 4576 register_netdevice_notifier(&ipv6_dev_notf); 4577 4578 addrconf_verify(0); 4579 4580 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4581 if (err < 0) 4582 goto errout; 4583 4584 /* Only the first call to __rtnl_register can fail */ 4585 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4586 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4587 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4588 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4589 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4590 4591 ipv6_addr_label_rtnl_register(); 4592 4593 return 0; 4594 errout: 4595 unregister_netdevice_notifier(&ipv6_dev_notf); 4596 errlo: 4597 unregister_pernet_subsys(&addrconf_ops); 4598 4599 return err; 4600 } 4601 4602 void addrconf_cleanup(void) 4603 { 4604 struct inet6_ifaddr *ifa; 4605 struct net_device *dev; 4606 int i; 4607 4608 unregister_netdevice_notifier(&ipv6_dev_notf); 4609 unregister_pernet_subsys(&addrconf_ops); 4610 4611 rtnl_lock(); 4612 4613 /* clean dev list */ 4614 for_each_netdev(&init_net, dev) { 4615 if (__in6_dev_get(dev) == NULL) 4616 continue; 4617 addrconf_ifdown(dev, 1); 4618 } 4619 addrconf_ifdown(init_net.loopback_dev, 2); 4620 4621 /* 4622 * Check hash table. 4623 */ 4624 write_lock_bh(&addrconf_hash_lock); 4625 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4626 for (ifa=inet6_addr_lst[i]; ifa; ) { 4627 struct inet6_ifaddr *bifa; 4628 4629 bifa = ifa; 4630 ifa = ifa->lst_next; 4631 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4632 /* Do not free it; something is wrong. 4633 Now we can investigate it with debugger. 4634 */ 4635 } 4636 } 4637 write_unlock_bh(&addrconf_hash_lock); 4638 4639 del_timer(&addr_chk_timer); 4640 rtnl_unlock(); 4641 } 4642