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/socket.h> 44 #include <linux/sockios.h> 45 #include <linux/net.h> 46 #include <linux/in6.h> 47 #include <linux/netdevice.h> 48 #include <linux/if_addr.h> 49 #include <linux/if_arp.h> 50 #include <linux/if_arcnet.h> 51 #include <linux/if_infiniband.h> 52 #include <linux/route.h> 53 #include <linux/inetdevice.h> 54 #include <linux/init.h> 55 #ifdef CONFIG_SYSCTL 56 #include <linux/sysctl.h> 57 #endif 58 #include <linux/capability.h> 59 #include <linux/delay.h> 60 #include <linux/notifier.h> 61 #include <linux/string.h> 62 63 #include <net/net_namespace.h> 64 #include <net/sock.h> 65 #include <net/snmp.h> 66 67 #include <net/ipv6.h> 68 #include <net/protocol.h> 69 #include <net/ndisc.h> 70 #include <net/ip6_route.h> 71 #include <net/addrconf.h> 72 #include <net/tcp.h> 73 #include <net/ip.h> 74 #include <net/netlink.h> 75 #include <net/pkt_sched.h> 76 #include <linux/if_tunnel.h> 77 #include <linux/rtnetlink.h> 78 79 #ifdef CONFIG_IPV6_PRIVACY 80 #include <linux/random.h> 81 #endif 82 83 #include <asm/uaccess.h> 84 #include <asm/unaligned.h> 85 86 #include <linux/proc_fs.h> 87 #include <linux/seq_file.h> 88 89 /* Set to 3 to get tracing... */ 90 #define ACONF_DEBUG 2 91 92 #if ACONF_DEBUG >= 3 93 #define ADBG(x) printk x 94 #else 95 #define ADBG(x) 96 #endif 97 98 #define INFINITY_LIFE_TIME 0xFFFFFFFF 99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 100 101 #ifdef CONFIG_SYSCTL 102 static void addrconf_sysctl_register(struct inet6_dev *idev); 103 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 104 #else 105 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 106 { 107 } 108 109 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 110 { 111 } 112 #endif 113 114 #ifdef CONFIG_IPV6_PRIVACY 115 static int __ipv6_regen_rndid(struct inet6_dev *idev); 116 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 117 static void ipv6_regen_rndid(unsigned long data); 118 119 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 120 #endif 121 122 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 123 static int ipv6_count_addresses(struct inet6_dev *idev); 124 125 /* 126 * Configured unicast address hash table 127 */ 128 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 129 static DEFINE_RWLOCK(addrconf_hash_lock); 130 131 static void addrconf_verify(unsigned long); 132 133 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 134 static DEFINE_SPINLOCK(addrconf_verify_lock); 135 136 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 137 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 138 139 static int addrconf_ifdown(struct net_device *dev, int how); 140 141 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 142 static void addrconf_dad_timer(unsigned long data); 143 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 144 static void addrconf_dad_run(struct inet6_dev *idev); 145 static void addrconf_rs_timer(unsigned long data); 146 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 147 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 148 149 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 150 struct prefix_info *pinfo); 151 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 152 struct net_device *dev); 153 154 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 155 156 static struct ipv6_devconf ipv6_devconf __read_mostly = { 157 .forwarding = 0, 158 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 159 .mtu6 = IPV6_MIN_MTU, 160 .accept_ra = 1, 161 .accept_redirects = 1, 162 .autoconf = 1, 163 .force_mld_version = 0, 164 .dad_transmits = 1, 165 .rtr_solicits = MAX_RTR_SOLICITATIONS, 166 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 167 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 168 #ifdef CONFIG_IPV6_PRIVACY 169 .use_tempaddr = 0, 170 .temp_valid_lft = TEMP_VALID_LIFETIME, 171 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 172 .regen_max_retry = REGEN_MAX_RETRY, 173 .max_desync_factor = MAX_DESYNC_FACTOR, 174 #endif 175 .max_addresses = IPV6_MAX_ADDRESSES, 176 .accept_ra_defrtr = 1, 177 .accept_ra_pinfo = 1, 178 #ifdef CONFIG_IPV6_ROUTER_PREF 179 .accept_ra_rtr_pref = 1, 180 .rtr_probe_interval = 60 * HZ, 181 #ifdef CONFIG_IPV6_ROUTE_INFO 182 .accept_ra_rt_info_max_plen = 0, 183 #endif 184 #endif 185 .proxy_ndp = 0, 186 .accept_source_route = 0, /* we do not accept RH0 by default. */ 187 .disable_ipv6 = 0, 188 .accept_dad = 1, 189 }; 190 191 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 192 .forwarding = 0, 193 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 194 .mtu6 = IPV6_MIN_MTU, 195 .accept_ra = 1, 196 .accept_redirects = 1, 197 .autoconf = 1, 198 .dad_transmits = 1, 199 .rtr_solicits = MAX_RTR_SOLICITATIONS, 200 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 202 #ifdef CONFIG_IPV6_PRIVACY 203 .use_tempaddr = 0, 204 .temp_valid_lft = TEMP_VALID_LIFETIME, 205 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 206 .regen_max_retry = REGEN_MAX_RETRY, 207 .max_desync_factor = MAX_DESYNC_FACTOR, 208 #endif 209 .max_addresses = IPV6_MAX_ADDRESSES, 210 .accept_ra_defrtr = 1, 211 .accept_ra_pinfo = 1, 212 #ifdef CONFIG_IPV6_ROUTER_PREF 213 .accept_ra_rtr_pref = 1, 214 .rtr_probe_interval = 60 * HZ, 215 #ifdef CONFIG_IPV6_ROUTE_INFO 216 .accept_ra_rt_info_max_plen = 0, 217 #endif 218 #endif 219 .proxy_ndp = 0, 220 .accept_source_route = 0, /* we do not accept RH0 by default. */ 221 .disable_ipv6 = 0, 222 .accept_dad = 1, 223 }; 224 225 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 226 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 227 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 228 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 229 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 230 231 /* Check if a valid qdisc is available */ 232 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 233 { 234 return !qdisc_tx_is_noop(dev); 235 } 236 237 /* Check if a route is valid prefix route */ 238 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 239 { 240 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0); 241 } 242 243 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 244 { 245 if (del_timer(&ifp->timer)) 246 __in6_ifa_put(ifp); 247 } 248 249 enum addrconf_timer_t 250 { 251 AC_NONE, 252 AC_DAD, 253 AC_RS, 254 }; 255 256 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 257 enum addrconf_timer_t what, 258 unsigned long when) 259 { 260 if (!del_timer(&ifp->timer)) 261 in6_ifa_hold(ifp); 262 263 switch (what) { 264 case AC_DAD: 265 ifp->timer.function = addrconf_dad_timer; 266 break; 267 case AC_RS: 268 ifp->timer.function = addrconf_rs_timer; 269 break; 270 default:; 271 } 272 ifp->timer.expires = jiffies + when; 273 add_timer(&ifp->timer); 274 } 275 276 static int snmp6_alloc_dev(struct inet6_dev *idev) 277 { 278 if (snmp_mib_init((void **)idev->stats.ipv6, 279 sizeof(struct ipstats_mib)) < 0) 280 goto err_ip; 281 if (snmp_mib_init((void **)idev->stats.icmpv6, 282 sizeof(struct icmpv6_mib)) < 0) 283 goto err_icmp; 284 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 285 sizeof(struct icmpv6msg_mib)) < 0) 286 goto err_icmpmsg; 287 288 return 0; 289 290 err_icmpmsg: 291 snmp_mib_free((void **)idev->stats.icmpv6); 292 err_icmp: 293 snmp_mib_free((void **)idev->stats.ipv6); 294 err_ip: 295 return -ENOMEM; 296 } 297 298 static void snmp6_free_dev(struct inet6_dev *idev) 299 { 300 snmp_mib_free((void **)idev->stats.icmpv6msg); 301 snmp_mib_free((void **)idev->stats.icmpv6); 302 snmp_mib_free((void **)idev->stats.ipv6); 303 } 304 305 /* Nobody refers to this device, we may destroy it. */ 306 307 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 308 { 309 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 310 kfree(idev); 311 } 312 313 void in6_dev_finish_destroy(struct inet6_dev *idev) 314 { 315 struct net_device *dev = idev->dev; 316 317 WARN_ON(idev->addr_list != NULL); 318 WARN_ON(idev->mc_list != NULL); 319 320 #ifdef NET_REFCNT_DEBUG 321 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 322 #endif 323 dev_put(dev); 324 if (!idev->dead) { 325 printk("Freeing alive inet6 device %p\n", idev); 326 return; 327 } 328 snmp6_free_dev(idev); 329 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 330 } 331 332 EXPORT_SYMBOL(in6_dev_finish_destroy); 333 334 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 335 { 336 struct inet6_dev *ndev; 337 338 ASSERT_RTNL(); 339 340 if (dev->mtu < IPV6_MIN_MTU) 341 return NULL; 342 343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 344 345 if (ndev == NULL) 346 return NULL; 347 348 rwlock_init(&ndev->lock); 349 ndev->dev = dev; 350 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 351 ndev->cnf.mtu6 = dev->mtu; 352 ndev->cnf.sysctl = NULL; 353 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 354 if (ndev->nd_parms == NULL) { 355 kfree(ndev); 356 return NULL; 357 } 358 if (ndev->cnf.forwarding) 359 dev_disable_lro(dev); 360 /* We refer to the device */ 361 dev_hold(dev); 362 363 if (snmp6_alloc_dev(ndev) < 0) { 364 ADBG((KERN_WARNING 365 "%s(): cannot allocate memory for statistics; dev=%s.\n", 366 __func__, dev->name)); 367 neigh_parms_release(&nd_tbl, ndev->nd_parms); 368 ndev->dead = 1; 369 in6_dev_finish_destroy(ndev); 370 return NULL; 371 } 372 373 if (snmp6_register_dev(ndev) < 0) { 374 ADBG((KERN_WARNING 375 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 376 __func__, dev->name)); 377 neigh_parms_release(&nd_tbl, ndev->nd_parms); 378 ndev->dead = 1; 379 in6_dev_finish_destroy(ndev); 380 return NULL; 381 } 382 383 /* One reference from device. We must do this before 384 * we invoke __ipv6_regen_rndid(). 385 */ 386 in6_dev_hold(ndev); 387 388 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 389 ndev->cnf.accept_dad = -1; 390 391 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 392 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 393 printk(KERN_INFO 394 "%s: Disabled Multicast RS\n", 395 dev->name); 396 ndev->cnf.rtr_solicits = 0; 397 } 398 #endif 399 400 #ifdef CONFIG_IPV6_PRIVACY 401 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 402 if ((dev->flags&IFF_LOOPBACK) || 403 dev->type == ARPHRD_TUNNEL || 404 dev->type == ARPHRD_TUNNEL6 || 405 dev->type == ARPHRD_SIT || 406 dev->type == ARPHRD_NONE) { 407 printk(KERN_INFO 408 "%s: Disabled Privacy Extensions\n", 409 dev->name); 410 ndev->cnf.use_tempaddr = -1; 411 } else { 412 in6_dev_hold(ndev); 413 ipv6_regen_rndid((unsigned long) ndev); 414 } 415 #endif 416 417 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 418 ndev->if_flags |= IF_READY; 419 420 ipv6_mc_init_dev(ndev); 421 ndev->tstamp = jiffies; 422 addrconf_sysctl_register(ndev); 423 /* protected by rtnl_lock */ 424 rcu_assign_pointer(dev->ip6_ptr, ndev); 425 426 /* Join all-node multicast group */ 427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 428 429 return ndev; 430 } 431 432 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 433 { 434 struct inet6_dev *idev; 435 436 ASSERT_RTNL(); 437 438 if ((idev = __in6_dev_get(dev)) == NULL) { 439 if ((idev = ipv6_add_dev(dev)) == NULL) 440 return NULL; 441 } 442 443 if (dev->flags&IFF_UP) 444 ipv6_mc_up(idev); 445 return idev; 446 } 447 448 #ifdef CONFIG_SYSCTL 449 static void dev_forward_change(struct inet6_dev *idev) 450 { 451 struct net_device *dev; 452 struct inet6_ifaddr *ifa; 453 454 if (!idev) 455 return; 456 dev = idev->dev; 457 if (idev->cnf.forwarding) 458 dev_disable_lro(dev); 459 if (dev && (dev->flags & IFF_MULTICAST)) { 460 if (idev->cnf.forwarding) 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 462 else 463 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 464 } 465 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 466 if (ifa->flags&IFA_F_TENTATIVE) 467 continue; 468 if (idev->cnf.forwarding) 469 addrconf_join_anycast(ifa); 470 else 471 addrconf_leave_anycast(ifa); 472 } 473 } 474 475 476 static void addrconf_forward_change(struct net *net, __s32 newf) 477 { 478 struct net_device *dev; 479 struct inet6_dev *idev; 480 481 read_lock(&dev_base_lock); 482 for_each_netdev(net, dev) { 483 rcu_read_lock(); 484 idev = __in6_dev_get(dev); 485 if (idev) { 486 int changed = (!idev->cnf.forwarding) ^ (!newf); 487 idev->cnf.forwarding = newf; 488 if (changed) 489 dev_forward_change(idev); 490 } 491 rcu_read_unlock(); 492 } 493 read_unlock(&dev_base_lock); 494 } 495 496 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 497 { 498 struct net *net; 499 500 net = (struct net *)table->extra2; 501 if (p == &net->ipv6.devconf_dflt->forwarding) 502 return 0; 503 504 if (!rtnl_trylock()) 505 return -ERESTARTSYS; 506 507 if (p == &net->ipv6.devconf_all->forwarding) { 508 __s32 newf = net->ipv6.devconf_all->forwarding; 509 net->ipv6.devconf_dflt->forwarding = newf; 510 addrconf_forward_change(net, newf); 511 } else if ((!*p) ^ (!old)) 512 dev_forward_change((struct inet6_dev *)table->extra1); 513 rtnl_unlock(); 514 515 if (*p) 516 rt6_purge_dflt_routers(net); 517 return 1; 518 } 519 #endif 520 521 /* Nobody refers to this ifaddr, destroy it */ 522 523 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 524 { 525 WARN_ON(ifp->if_next != NULL); 526 WARN_ON(ifp->lst_next != NULL); 527 528 #ifdef NET_REFCNT_DEBUG 529 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 530 #endif 531 532 in6_dev_put(ifp->idev); 533 534 if (del_timer(&ifp->timer)) 535 printk("Timer is still running, when freeing ifa=%p\n", ifp); 536 537 if (!ifp->dead) { 538 printk("Freeing alive inet6 address %p\n", ifp); 539 return; 540 } 541 dst_release(&ifp->rt->u.dst); 542 543 kfree(ifp); 544 } 545 546 static void 547 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 548 { 549 struct inet6_ifaddr *ifa, **ifap; 550 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 551 552 /* 553 * Each device address list is sorted in order of scope - 554 * global before linklocal. 555 */ 556 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 557 ifap = &ifa->if_next) { 558 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 559 break; 560 } 561 562 ifp->if_next = *ifap; 563 *ifap = ifp; 564 } 565 566 /* 567 * Hash function taken from net_alias.c 568 */ 569 static u8 ipv6_addr_hash(const struct in6_addr *addr) 570 { 571 __u32 word; 572 573 /* 574 * We perform the hash function over the last 64 bits of the address 575 * This will include the IEEE address token on links that support it. 576 */ 577 578 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 579 word ^= (word >> 16); 580 word ^= (word >> 8); 581 582 return ((word ^ (word >> 4)) & 0x0f); 583 } 584 585 /* On success it returns ifp with increased reference count */ 586 587 static struct inet6_ifaddr * 588 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 589 int scope, u32 flags) 590 { 591 struct inet6_ifaddr *ifa = NULL; 592 struct rt6_info *rt; 593 int hash; 594 int err = 0; 595 int addr_type = ipv6_addr_type(addr); 596 597 if (addr_type == IPV6_ADDR_ANY || 598 addr_type & IPV6_ADDR_MULTICAST || 599 (!(idev->dev->flags & IFF_LOOPBACK) && 600 addr_type & IPV6_ADDR_LOOPBACK)) 601 return ERR_PTR(-EADDRNOTAVAIL); 602 603 rcu_read_lock_bh(); 604 if (idev->dead) { 605 err = -ENODEV; /*XXX*/ 606 goto out2; 607 } 608 609 write_lock(&addrconf_hash_lock); 610 611 /* Ignore adding duplicate addresses on an interface */ 612 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 613 ADBG(("ipv6_add_addr: already assigned\n")); 614 err = -EEXIST; 615 goto out; 616 } 617 618 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 619 620 if (ifa == NULL) { 621 ADBG(("ipv6_add_addr: malloc failed\n")); 622 err = -ENOBUFS; 623 goto out; 624 } 625 626 rt = addrconf_dst_alloc(idev, addr, 0); 627 if (IS_ERR(rt)) { 628 err = PTR_ERR(rt); 629 goto out; 630 } 631 632 ipv6_addr_copy(&ifa->addr, addr); 633 634 spin_lock_init(&ifa->lock); 635 init_timer(&ifa->timer); 636 ifa->timer.data = (unsigned long) ifa; 637 ifa->scope = scope; 638 ifa->prefix_len = pfxlen; 639 ifa->flags = flags | IFA_F_TENTATIVE; 640 ifa->cstamp = ifa->tstamp = jiffies; 641 642 ifa->rt = rt; 643 644 /* 645 * part one of RFC 4429, section 3.3 646 * We should not configure an address as 647 * optimistic if we do not yet know the link 648 * layer address of our nexhop router 649 */ 650 651 if (rt->rt6i_nexthop == NULL) 652 ifa->flags &= ~IFA_F_OPTIMISTIC; 653 654 ifa->idev = idev; 655 in6_dev_hold(idev); 656 /* For caller */ 657 in6_ifa_hold(ifa); 658 659 /* Add to big hash table */ 660 hash = ipv6_addr_hash(addr); 661 662 ifa->lst_next = inet6_addr_lst[hash]; 663 inet6_addr_lst[hash] = ifa; 664 in6_ifa_hold(ifa); 665 write_unlock(&addrconf_hash_lock); 666 667 write_lock(&idev->lock); 668 /* Add to inet6_dev unicast addr list. */ 669 ipv6_link_dev_addr(idev, ifa); 670 671 #ifdef CONFIG_IPV6_PRIVACY 672 if (ifa->flags&IFA_F_TEMPORARY) { 673 ifa->tmp_next = idev->tempaddr_list; 674 idev->tempaddr_list = ifa; 675 in6_ifa_hold(ifa); 676 } 677 #endif 678 679 in6_ifa_hold(ifa); 680 write_unlock(&idev->lock); 681 out2: 682 rcu_read_unlock_bh(); 683 684 if (likely(err == 0)) 685 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 686 else { 687 kfree(ifa); 688 ifa = ERR_PTR(err); 689 } 690 691 return ifa; 692 out: 693 write_unlock(&addrconf_hash_lock); 694 goto out2; 695 } 696 697 /* This function wants to get referenced ifp and releases it before return */ 698 699 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 700 { 701 struct inet6_ifaddr *ifa, **ifap; 702 struct inet6_dev *idev = ifp->idev; 703 int hash; 704 int deleted = 0, onlink = 0; 705 unsigned long expires = jiffies; 706 707 hash = ipv6_addr_hash(&ifp->addr); 708 709 ifp->dead = 1; 710 711 write_lock_bh(&addrconf_hash_lock); 712 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 713 ifap = &ifa->lst_next) { 714 if (ifa == ifp) { 715 *ifap = ifa->lst_next; 716 __in6_ifa_put(ifp); 717 ifa->lst_next = NULL; 718 break; 719 } 720 } 721 write_unlock_bh(&addrconf_hash_lock); 722 723 write_lock_bh(&idev->lock); 724 #ifdef CONFIG_IPV6_PRIVACY 725 if (ifp->flags&IFA_F_TEMPORARY) { 726 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 727 ifap = &ifa->tmp_next) { 728 if (ifa == ifp) { 729 *ifap = ifa->tmp_next; 730 if (ifp->ifpub) { 731 in6_ifa_put(ifp->ifpub); 732 ifp->ifpub = NULL; 733 } 734 __in6_ifa_put(ifp); 735 ifa->tmp_next = NULL; 736 break; 737 } 738 } 739 } 740 #endif 741 742 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 743 if (ifa == ifp) { 744 *ifap = ifa->if_next; 745 __in6_ifa_put(ifp); 746 ifa->if_next = NULL; 747 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 748 break; 749 deleted = 1; 750 continue; 751 } else if (ifp->flags & IFA_F_PERMANENT) { 752 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 753 ifp->prefix_len)) { 754 if (ifa->flags & IFA_F_PERMANENT) { 755 onlink = 1; 756 if (deleted) 757 break; 758 } else { 759 unsigned long lifetime; 760 761 if (!onlink) 762 onlink = -1; 763 764 spin_lock(&ifa->lock); 765 766 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 767 /* 768 * Note: Because this address is 769 * not permanent, lifetime < 770 * LONG_MAX / HZ here. 771 */ 772 if (time_before(expires, 773 ifa->tstamp + lifetime * HZ)) 774 expires = ifa->tstamp + lifetime * HZ; 775 spin_unlock(&ifa->lock); 776 } 777 } 778 } 779 ifap = &ifa->if_next; 780 } 781 write_unlock_bh(&idev->lock); 782 783 addrconf_del_timer(ifp); 784 785 ipv6_ifa_notify(RTM_DELADDR, ifp); 786 787 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 788 789 /* 790 * Purge or update corresponding prefix 791 * 792 * 1) we don't purge prefix here if address was not permanent. 793 * prefix is managed by its own lifetime. 794 * 2) if there're no addresses, delete prefix. 795 * 3) if there're still other permanent address(es), 796 * corresponding prefix is still permanent. 797 * 4) otherwise, update prefix lifetime to the 798 * longest valid lifetime among the corresponding 799 * addresses on the device. 800 * Note: subsequent RA will update lifetime. 801 * 802 * --yoshfuji 803 */ 804 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 805 struct in6_addr prefix; 806 struct rt6_info *rt; 807 struct net *net = dev_net(ifp->idev->dev); 808 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 809 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 810 811 if (rt && addrconf_is_prefix_route(rt)) { 812 if (onlink == 0) { 813 ip6_del_rt(rt); 814 rt = NULL; 815 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 816 rt->rt6i_expires = expires; 817 rt->rt6i_flags |= RTF_EXPIRES; 818 } 819 } 820 dst_release(&rt->u.dst); 821 } 822 823 in6_ifa_put(ifp); 824 } 825 826 #ifdef CONFIG_IPV6_PRIVACY 827 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 828 { 829 struct inet6_dev *idev = ifp->idev; 830 struct in6_addr addr, *tmpaddr; 831 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 832 unsigned long regen_advance; 833 int tmp_plen; 834 int ret = 0; 835 int max_addresses; 836 u32 addr_flags; 837 838 write_lock(&idev->lock); 839 if (ift) { 840 spin_lock_bh(&ift->lock); 841 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 842 spin_unlock_bh(&ift->lock); 843 tmpaddr = &addr; 844 } else { 845 tmpaddr = NULL; 846 } 847 retry: 848 in6_dev_hold(idev); 849 if (idev->cnf.use_tempaddr <= 0) { 850 write_unlock(&idev->lock); 851 printk(KERN_INFO 852 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 853 in6_dev_put(idev); 854 ret = -1; 855 goto out; 856 } 857 spin_lock_bh(&ifp->lock); 858 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 859 idev->cnf.use_tempaddr = -1; /*XXX*/ 860 spin_unlock_bh(&ifp->lock); 861 write_unlock(&idev->lock); 862 printk(KERN_WARNING 863 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 864 in6_dev_put(idev); 865 ret = -1; 866 goto out; 867 } 868 in6_ifa_hold(ifp); 869 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 870 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 871 spin_unlock_bh(&ifp->lock); 872 write_unlock(&idev->lock); 873 printk(KERN_WARNING 874 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 875 in6_ifa_put(ifp); 876 in6_dev_put(idev); 877 ret = -1; 878 goto out; 879 } 880 memcpy(&addr.s6_addr[8], idev->rndid, 8); 881 tmp_valid_lft = min_t(__u32, 882 ifp->valid_lft, 883 idev->cnf.temp_valid_lft); 884 tmp_prefered_lft = min_t(__u32, 885 ifp->prefered_lft, 886 idev->cnf.temp_prefered_lft - desync_factor / HZ); 887 tmp_plen = ifp->prefix_len; 888 max_addresses = idev->cnf.max_addresses; 889 tmp_cstamp = ifp->cstamp; 890 tmp_tstamp = ifp->tstamp; 891 spin_unlock_bh(&ifp->lock); 892 893 regen_advance = idev->cnf.regen_max_retry * 894 idev->cnf.dad_transmits * 895 idev->nd_parms->retrans_time / HZ; 896 write_unlock(&idev->lock); 897 898 /* A temporary address is created only if this calculated Preferred 899 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 900 * an implementation must not create a temporary address with a zero 901 * Preferred Lifetime. 902 */ 903 if (tmp_prefered_lft <= regen_advance) { 904 in6_ifa_put(ifp); 905 in6_dev_put(idev); 906 ret = -1; 907 goto out; 908 } 909 910 addr_flags = IFA_F_TEMPORARY; 911 /* set in addrconf_prefix_rcv() */ 912 if (ifp->flags & IFA_F_OPTIMISTIC) 913 addr_flags |= IFA_F_OPTIMISTIC; 914 915 ift = !max_addresses || 916 ipv6_count_addresses(idev) < max_addresses ? 917 ipv6_add_addr(idev, &addr, tmp_plen, 918 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 919 addr_flags) : NULL; 920 if (!ift || IS_ERR(ift)) { 921 in6_ifa_put(ifp); 922 in6_dev_put(idev); 923 printk(KERN_INFO 924 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 925 tmpaddr = &addr; 926 write_lock(&idev->lock); 927 goto retry; 928 } 929 930 spin_lock_bh(&ift->lock); 931 ift->ifpub = ifp; 932 ift->valid_lft = tmp_valid_lft; 933 ift->prefered_lft = tmp_prefered_lft; 934 ift->cstamp = tmp_cstamp; 935 ift->tstamp = tmp_tstamp; 936 spin_unlock_bh(&ift->lock); 937 938 addrconf_dad_start(ift, 0); 939 in6_ifa_put(ift); 940 in6_dev_put(idev); 941 out: 942 return ret; 943 } 944 #endif 945 946 /* 947 * Choose an appropriate source address (RFC3484) 948 */ 949 enum { 950 IPV6_SADDR_RULE_INIT = 0, 951 IPV6_SADDR_RULE_LOCAL, 952 IPV6_SADDR_RULE_SCOPE, 953 IPV6_SADDR_RULE_PREFERRED, 954 #ifdef CONFIG_IPV6_MIP6 955 IPV6_SADDR_RULE_HOA, 956 #endif 957 IPV6_SADDR_RULE_OIF, 958 IPV6_SADDR_RULE_LABEL, 959 #ifdef CONFIG_IPV6_PRIVACY 960 IPV6_SADDR_RULE_PRIVACY, 961 #endif 962 IPV6_SADDR_RULE_ORCHID, 963 IPV6_SADDR_RULE_PREFIX, 964 IPV6_SADDR_RULE_MAX 965 }; 966 967 struct ipv6_saddr_score { 968 int rule; 969 int addr_type; 970 struct inet6_ifaddr *ifa; 971 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 972 int scopedist; 973 int matchlen; 974 }; 975 976 struct ipv6_saddr_dst { 977 const struct in6_addr *addr; 978 int ifindex; 979 int scope; 980 int label; 981 unsigned int prefs; 982 }; 983 984 static inline int ipv6_saddr_preferred(int type) 985 { 986 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 987 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 988 return 1; 989 return 0; 990 } 991 992 static int ipv6_get_saddr_eval(struct net *net, 993 struct ipv6_saddr_score *score, 994 struct ipv6_saddr_dst *dst, 995 int i) 996 { 997 int ret; 998 999 if (i <= score->rule) { 1000 switch (i) { 1001 case IPV6_SADDR_RULE_SCOPE: 1002 ret = score->scopedist; 1003 break; 1004 case IPV6_SADDR_RULE_PREFIX: 1005 ret = score->matchlen; 1006 break; 1007 default: 1008 ret = !!test_bit(i, score->scorebits); 1009 } 1010 goto out; 1011 } 1012 1013 switch (i) { 1014 case IPV6_SADDR_RULE_INIT: 1015 /* Rule 0: remember if hiscore is not ready yet */ 1016 ret = !!score->ifa; 1017 break; 1018 case IPV6_SADDR_RULE_LOCAL: 1019 /* Rule 1: Prefer same address */ 1020 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1021 break; 1022 case IPV6_SADDR_RULE_SCOPE: 1023 /* Rule 2: Prefer appropriate scope 1024 * 1025 * ret 1026 * ^ 1027 * -1 | d 15 1028 * ---+--+-+---> scope 1029 * | 1030 * | d is scope of the destination. 1031 * B-d | \ 1032 * | \ <- smaller scope is better if 1033 * B-15 | \ if scope is enough for destinaion. 1034 * | ret = B - scope (-1 <= scope >= d <= 15). 1035 * d-C-1 | / 1036 * |/ <- greater is better 1037 * -C / if scope is not enough for destination. 1038 * /| ret = scope - C (-1 <= d < scope <= 15). 1039 * 1040 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1041 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1042 * Assume B = 0 and we get C > 29. 1043 */ 1044 ret = __ipv6_addr_src_scope(score->addr_type); 1045 if (ret >= dst->scope) 1046 ret = -ret; 1047 else 1048 ret -= 128; /* 30 is enough */ 1049 score->scopedist = ret; 1050 break; 1051 case IPV6_SADDR_RULE_PREFERRED: 1052 /* Rule 3: Avoid deprecated and optimistic addresses */ 1053 ret = ipv6_saddr_preferred(score->addr_type) || 1054 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1055 break; 1056 #ifdef CONFIG_IPV6_MIP6 1057 case IPV6_SADDR_RULE_HOA: 1058 { 1059 /* Rule 4: Prefer home address */ 1060 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1061 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1062 break; 1063 } 1064 #endif 1065 case IPV6_SADDR_RULE_OIF: 1066 /* Rule 5: Prefer outgoing interface */ 1067 ret = (!dst->ifindex || 1068 dst->ifindex == score->ifa->idev->dev->ifindex); 1069 break; 1070 case IPV6_SADDR_RULE_LABEL: 1071 /* Rule 6: Prefer matching label */ 1072 ret = ipv6_addr_label(net, 1073 &score->ifa->addr, score->addr_type, 1074 score->ifa->idev->dev->ifindex) == dst->label; 1075 break; 1076 #ifdef CONFIG_IPV6_PRIVACY 1077 case IPV6_SADDR_RULE_PRIVACY: 1078 { 1079 /* Rule 7: Prefer public address 1080 * Note: prefer temprary address if use_tempaddr >= 2 1081 */ 1082 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1083 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1084 score->ifa->idev->cnf.use_tempaddr >= 2; 1085 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1086 break; 1087 } 1088 #endif 1089 case IPV6_SADDR_RULE_ORCHID: 1090 /* Rule 8-: Prefer ORCHID vs ORCHID or 1091 * non-ORCHID vs non-ORCHID 1092 */ 1093 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1094 ipv6_addr_orchid(dst->addr)); 1095 break; 1096 case IPV6_SADDR_RULE_PREFIX: 1097 /* Rule 8: Use longest matching prefix */ 1098 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1099 dst->addr); 1100 break; 1101 default: 1102 ret = 0; 1103 } 1104 1105 if (ret) 1106 __set_bit(i, score->scorebits); 1107 score->rule = i; 1108 out: 1109 return ret; 1110 } 1111 1112 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1113 const struct in6_addr *daddr, unsigned int prefs, 1114 struct in6_addr *saddr) 1115 { 1116 struct ipv6_saddr_score scores[2], 1117 *score = &scores[0], *hiscore = &scores[1]; 1118 struct ipv6_saddr_dst dst; 1119 struct net_device *dev; 1120 int dst_type; 1121 1122 dst_type = __ipv6_addr_type(daddr); 1123 dst.addr = daddr; 1124 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1125 dst.scope = __ipv6_addr_src_scope(dst_type); 1126 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1127 dst.prefs = prefs; 1128 1129 hiscore->rule = -1; 1130 hiscore->ifa = NULL; 1131 1132 read_lock(&dev_base_lock); 1133 rcu_read_lock(); 1134 1135 for_each_netdev(net, dev) { 1136 struct inet6_dev *idev; 1137 1138 /* Candidate Source Address (section 4) 1139 * - multicast and link-local destination address, 1140 * the set of candidate source address MUST only 1141 * include addresses assigned to interfaces 1142 * belonging to the same link as the outgoing 1143 * interface. 1144 * (- For site-local destination addresses, the 1145 * set of candidate source addresses MUST only 1146 * include addresses assigned to interfaces 1147 * belonging to the same site as the outgoing 1148 * interface.) 1149 */ 1150 if (((dst_type & IPV6_ADDR_MULTICAST) || 1151 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1152 dst.ifindex && dev->ifindex != dst.ifindex) 1153 continue; 1154 1155 idev = __in6_dev_get(dev); 1156 if (!idev) 1157 continue; 1158 1159 read_lock_bh(&idev->lock); 1160 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1161 int i; 1162 1163 /* 1164 * - Tentative Address (RFC2462 section 5.4) 1165 * - A tentative address is not considered 1166 * "assigned to an interface" in the traditional 1167 * sense, unless it is also flagged as optimistic. 1168 * - Candidate Source Address (section 4) 1169 * - In any case, anycast addresses, multicast 1170 * addresses, and the unspecified address MUST 1171 * NOT be included in a candidate set. 1172 */ 1173 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1174 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1175 continue; 1176 1177 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1178 1179 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1180 score->addr_type & IPV6_ADDR_MULTICAST)) { 1181 LIMIT_NETDEBUG(KERN_DEBUG 1182 "ADDRCONF: unspecified / multicast address " 1183 "assigned as unicast address on %s", 1184 dev->name); 1185 continue; 1186 } 1187 1188 score->rule = -1; 1189 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1190 1191 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1192 int minihiscore, miniscore; 1193 1194 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1195 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1196 1197 if (minihiscore > miniscore) { 1198 if (i == IPV6_SADDR_RULE_SCOPE && 1199 score->scopedist > 0) { 1200 /* 1201 * special case: 1202 * each remaining entry 1203 * has too small (not enough) 1204 * scope, because ifa entries 1205 * are sorted by their scope 1206 * values. 1207 */ 1208 goto try_nextdev; 1209 } 1210 break; 1211 } else if (minihiscore < miniscore) { 1212 struct ipv6_saddr_score *tmp; 1213 1214 if (hiscore->ifa) 1215 in6_ifa_put(hiscore->ifa); 1216 1217 in6_ifa_hold(score->ifa); 1218 1219 tmp = hiscore; 1220 hiscore = score; 1221 score = tmp; 1222 1223 /* restore our iterator */ 1224 score->ifa = hiscore->ifa; 1225 1226 break; 1227 } 1228 } 1229 } 1230 try_nextdev: 1231 read_unlock_bh(&idev->lock); 1232 } 1233 rcu_read_unlock(); 1234 read_unlock(&dev_base_lock); 1235 1236 if (!hiscore->ifa) 1237 return -EADDRNOTAVAIL; 1238 1239 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1240 in6_ifa_put(hiscore->ifa); 1241 return 0; 1242 } 1243 1244 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1245 1246 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1247 unsigned char banned_flags) 1248 { 1249 struct inet6_dev *idev; 1250 int err = -EADDRNOTAVAIL; 1251 1252 rcu_read_lock(); 1253 if ((idev = __in6_dev_get(dev)) != NULL) { 1254 struct inet6_ifaddr *ifp; 1255 1256 read_lock_bh(&idev->lock); 1257 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1258 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1259 ipv6_addr_copy(addr, &ifp->addr); 1260 err = 0; 1261 break; 1262 } 1263 } 1264 read_unlock_bh(&idev->lock); 1265 } 1266 rcu_read_unlock(); 1267 return err; 1268 } 1269 1270 static int ipv6_count_addresses(struct inet6_dev *idev) 1271 { 1272 int cnt = 0; 1273 struct inet6_ifaddr *ifp; 1274 1275 read_lock_bh(&idev->lock); 1276 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1277 cnt++; 1278 read_unlock_bh(&idev->lock); 1279 return cnt; 1280 } 1281 1282 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1283 struct net_device *dev, int strict) 1284 { 1285 struct inet6_ifaddr * ifp; 1286 u8 hash = ipv6_addr_hash(addr); 1287 1288 read_lock_bh(&addrconf_hash_lock); 1289 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1290 if (!net_eq(dev_net(ifp->idev->dev), net)) 1291 continue; 1292 if (ipv6_addr_equal(&ifp->addr, addr) && 1293 !(ifp->flags&IFA_F_TENTATIVE)) { 1294 if (dev == NULL || ifp->idev->dev == dev || 1295 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1296 break; 1297 } 1298 } 1299 read_unlock_bh(&addrconf_hash_lock); 1300 return ifp != NULL; 1301 } 1302 EXPORT_SYMBOL(ipv6_chk_addr); 1303 1304 static 1305 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1306 struct net_device *dev) 1307 { 1308 struct inet6_ifaddr * ifp; 1309 u8 hash = ipv6_addr_hash(addr); 1310 1311 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1312 if (!net_eq(dev_net(ifp->idev->dev), net)) 1313 continue; 1314 if (ipv6_addr_equal(&ifp->addr, addr)) { 1315 if (dev == NULL || ifp->idev->dev == dev) 1316 break; 1317 } 1318 } 1319 return ifp != NULL; 1320 } 1321 1322 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1323 { 1324 struct inet6_dev *idev; 1325 struct inet6_ifaddr *ifa; 1326 int onlink; 1327 1328 onlink = 0; 1329 rcu_read_lock(); 1330 idev = __in6_dev_get(dev); 1331 if (idev) { 1332 read_lock_bh(&idev->lock); 1333 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1334 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1335 ifa->prefix_len); 1336 if (onlink) 1337 break; 1338 } 1339 read_unlock_bh(&idev->lock); 1340 } 1341 rcu_read_unlock(); 1342 return onlink; 1343 } 1344 1345 EXPORT_SYMBOL(ipv6_chk_prefix); 1346 1347 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1348 struct net_device *dev, int strict) 1349 { 1350 struct inet6_ifaddr * ifp; 1351 u8 hash = ipv6_addr_hash(addr); 1352 1353 read_lock_bh(&addrconf_hash_lock); 1354 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1355 if (!net_eq(dev_net(ifp->idev->dev), net)) 1356 continue; 1357 if (ipv6_addr_equal(&ifp->addr, addr)) { 1358 if (dev == NULL || ifp->idev->dev == dev || 1359 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1360 in6_ifa_hold(ifp); 1361 break; 1362 } 1363 } 1364 } 1365 read_unlock_bh(&addrconf_hash_lock); 1366 1367 return ifp; 1368 } 1369 1370 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1371 { 1372 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1373 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1374 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1375 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1376 int sk_ipv6only = ipv6_only_sock(sk); 1377 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1378 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1379 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1380 1381 if (!sk2_rcv_saddr && !sk_ipv6only) 1382 return 1; 1383 1384 if (addr_type2 == IPV6_ADDR_ANY && 1385 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1386 return 1; 1387 1388 if (addr_type == IPV6_ADDR_ANY && 1389 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1390 return 1; 1391 1392 if (sk2_rcv_saddr6 && 1393 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1394 return 1; 1395 1396 if (addr_type == IPV6_ADDR_MAPPED && 1397 !sk2_ipv6only && 1398 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1399 return 1; 1400 1401 return 0; 1402 } 1403 1404 /* Gets referenced address, destroys ifaddr */ 1405 1406 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1407 { 1408 if (ifp->flags&IFA_F_PERMANENT) { 1409 spin_lock_bh(&ifp->lock); 1410 addrconf_del_timer(ifp); 1411 ifp->flags |= IFA_F_TENTATIVE; 1412 spin_unlock_bh(&ifp->lock); 1413 in6_ifa_put(ifp); 1414 #ifdef CONFIG_IPV6_PRIVACY 1415 } else if (ifp->flags&IFA_F_TEMPORARY) { 1416 struct inet6_ifaddr *ifpub; 1417 spin_lock_bh(&ifp->lock); 1418 ifpub = ifp->ifpub; 1419 if (ifpub) { 1420 in6_ifa_hold(ifpub); 1421 spin_unlock_bh(&ifp->lock); 1422 ipv6_create_tempaddr(ifpub, ifp); 1423 in6_ifa_put(ifpub); 1424 } else { 1425 spin_unlock_bh(&ifp->lock); 1426 } 1427 ipv6_del_addr(ifp); 1428 #endif 1429 } else 1430 ipv6_del_addr(ifp); 1431 } 1432 1433 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1434 { 1435 struct inet6_dev *idev = ifp->idev; 1436 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1437 struct in6_addr addr; 1438 1439 addr.s6_addr32[0] = htonl(0xfe800000); 1440 addr.s6_addr32[1] = 0; 1441 1442 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1443 ipv6_addr_equal(&ifp->addr, &addr)) { 1444 /* DAD failed for link-local based on MAC address */ 1445 idev->cnf.disable_ipv6 = 1; 1446 } 1447 } 1448 1449 if (net_ratelimit()) 1450 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1451 addrconf_dad_stop(ifp); 1452 } 1453 1454 /* Join to solicited addr multicast group. */ 1455 1456 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1457 { 1458 struct in6_addr maddr; 1459 1460 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1461 return; 1462 1463 addrconf_addr_solict_mult(addr, &maddr); 1464 ipv6_dev_mc_inc(dev, &maddr); 1465 } 1466 1467 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1468 { 1469 struct in6_addr maddr; 1470 1471 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1472 return; 1473 1474 addrconf_addr_solict_mult(addr, &maddr); 1475 __ipv6_dev_mc_dec(idev, &maddr); 1476 } 1477 1478 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1479 { 1480 struct in6_addr addr; 1481 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1482 if (ipv6_addr_any(&addr)) 1483 return; 1484 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1485 } 1486 1487 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1488 { 1489 struct in6_addr addr; 1490 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1491 if (ipv6_addr_any(&addr)) 1492 return; 1493 __ipv6_dev_ac_dec(ifp->idev, &addr); 1494 } 1495 1496 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1497 { 1498 if (dev->addr_len != ETH_ALEN) 1499 return -1; 1500 memcpy(eui, dev->dev_addr, 3); 1501 memcpy(eui + 5, dev->dev_addr + 3, 3); 1502 1503 /* 1504 * The zSeries OSA network cards can be shared among various 1505 * OS instances, but the OSA cards have only one MAC address. 1506 * This leads to duplicate address conflicts in conjunction 1507 * with IPv6 if more than one instance uses the same card. 1508 * 1509 * The driver for these cards can deliver a unique 16-bit 1510 * identifier for each instance sharing the same card. It is 1511 * placed instead of 0xFFFE in the interface identifier. The 1512 * "u" bit of the interface identifier is not inverted in this 1513 * case. Hence the resulting interface identifier has local 1514 * scope according to RFC2373. 1515 */ 1516 if (dev->dev_id) { 1517 eui[3] = (dev->dev_id >> 8) & 0xFF; 1518 eui[4] = dev->dev_id & 0xFF; 1519 } else { 1520 eui[3] = 0xFF; 1521 eui[4] = 0xFE; 1522 eui[0] ^= 2; 1523 } 1524 return 0; 1525 } 1526 1527 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1528 { 1529 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1530 if (dev->addr_len != ARCNET_ALEN) 1531 return -1; 1532 memset(eui, 0, 7); 1533 eui[7] = *(u8*)dev->dev_addr; 1534 return 0; 1535 } 1536 1537 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1538 { 1539 if (dev->addr_len != INFINIBAND_ALEN) 1540 return -1; 1541 memcpy(eui, dev->dev_addr + 12, 8); 1542 eui[0] |= 2; 1543 return 0; 1544 } 1545 1546 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1547 { 1548 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1549 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1550 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1551 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1552 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1553 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1554 eui[1] = 0; 1555 eui[2] = 0x5E; 1556 eui[3] = 0xFE; 1557 memcpy(eui + 4, &addr, 4); 1558 return 0; 1559 } 1560 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1561 1562 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1563 { 1564 if (dev->priv_flags & IFF_ISATAP) 1565 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1566 return -1; 1567 } 1568 1569 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1570 { 1571 switch (dev->type) { 1572 case ARPHRD_ETHER: 1573 case ARPHRD_FDDI: 1574 case ARPHRD_IEEE802_TR: 1575 return addrconf_ifid_eui48(eui, dev); 1576 case ARPHRD_ARCNET: 1577 return addrconf_ifid_arcnet(eui, dev); 1578 case ARPHRD_INFINIBAND: 1579 return addrconf_ifid_infiniband(eui, dev); 1580 case ARPHRD_SIT: 1581 return addrconf_ifid_sit(eui, dev); 1582 } 1583 return -1; 1584 } 1585 1586 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1587 { 1588 int err = -1; 1589 struct inet6_ifaddr *ifp; 1590 1591 read_lock_bh(&idev->lock); 1592 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1593 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1594 memcpy(eui, ifp->addr.s6_addr+8, 8); 1595 err = 0; 1596 break; 1597 } 1598 } 1599 read_unlock_bh(&idev->lock); 1600 return err; 1601 } 1602 1603 #ifdef CONFIG_IPV6_PRIVACY 1604 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1605 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1606 { 1607 regen: 1608 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1609 idev->rndid[0] &= ~0x02; 1610 1611 /* 1612 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1613 * check if generated address is not inappropriate 1614 * 1615 * - Reserved subnet anycast (RFC 2526) 1616 * 11111101 11....11 1xxxxxxx 1617 * - ISATAP (RFC4214) 6.1 1618 * 00-00-5E-FE-xx-xx-xx-xx 1619 * - value 0 1620 * - XXX: already assigned to an address on the device 1621 */ 1622 if (idev->rndid[0] == 0xfd && 1623 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1624 (idev->rndid[7]&0x80)) 1625 goto regen; 1626 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1627 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1628 goto regen; 1629 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1630 goto regen; 1631 } 1632 1633 return 0; 1634 } 1635 1636 static void ipv6_regen_rndid(unsigned long data) 1637 { 1638 struct inet6_dev *idev = (struct inet6_dev *) data; 1639 unsigned long expires; 1640 1641 rcu_read_lock_bh(); 1642 write_lock_bh(&idev->lock); 1643 1644 if (idev->dead) 1645 goto out; 1646 1647 if (__ipv6_regen_rndid(idev) < 0) 1648 goto out; 1649 1650 expires = jiffies + 1651 idev->cnf.temp_prefered_lft * HZ - 1652 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1653 if (time_before(expires, jiffies)) { 1654 printk(KERN_WARNING 1655 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1656 idev->dev->name); 1657 goto out; 1658 } 1659 1660 if (!mod_timer(&idev->regen_timer, expires)) 1661 in6_dev_hold(idev); 1662 1663 out: 1664 write_unlock_bh(&idev->lock); 1665 rcu_read_unlock_bh(); 1666 in6_dev_put(idev); 1667 } 1668 1669 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1670 int ret = 0; 1671 1672 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1673 ret = __ipv6_regen_rndid(idev); 1674 return ret; 1675 } 1676 #endif 1677 1678 /* 1679 * Add prefix route. 1680 */ 1681 1682 static void 1683 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1684 unsigned long expires, u32 flags) 1685 { 1686 struct fib6_config cfg = { 1687 .fc_table = RT6_TABLE_PREFIX, 1688 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1689 .fc_ifindex = dev->ifindex, 1690 .fc_expires = expires, 1691 .fc_dst_len = plen, 1692 .fc_flags = RTF_UP | flags, 1693 .fc_nlinfo.nl_net = dev_net(dev), 1694 .fc_protocol = RTPROT_KERNEL, 1695 }; 1696 1697 ipv6_addr_copy(&cfg.fc_dst, pfx); 1698 1699 /* Prevent useless cloning on PtP SIT. 1700 This thing is done here expecting that the whole 1701 class of non-broadcast devices need not cloning. 1702 */ 1703 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1704 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1705 cfg.fc_flags |= RTF_NONEXTHOP; 1706 #endif 1707 1708 ip6_route_add(&cfg); 1709 } 1710 1711 /* Create "default" multicast route to the interface */ 1712 1713 static void addrconf_add_mroute(struct net_device *dev) 1714 { 1715 struct fib6_config cfg = { 1716 .fc_table = RT6_TABLE_LOCAL, 1717 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1718 .fc_ifindex = dev->ifindex, 1719 .fc_dst_len = 8, 1720 .fc_flags = RTF_UP, 1721 .fc_nlinfo.nl_net = dev_net(dev), 1722 }; 1723 1724 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1725 1726 ip6_route_add(&cfg); 1727 } 1728 1729 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1730 static void sit_route_add(struct net_device *dev) 1731 { 1732 struct fib6_config cfg = { 1733 .fc_table = RT6_TABLE_MAIN, 1734 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1735 .fc_ifindex = dev->ifindex, 1736 .fc_dst_len = 96, 1737 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1738 .fc_nlinfo.nl_net = dev_net(dev), 1739 }; 1740 1741 /* prefix length - 96 bits "::d.d.d.d" */ 1742 ip6_route_add(&cfg); 1743 } 1744 #endif 1745 1746 static void addrconf_add_lroute(struct net_device *dev) 1747 { 1748 struct in6_addr addr; 1749 1750 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1751 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1752 } 1753 1754 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1755 { 1756 struct inet6_dev *idev; 1757 1758 ASSERT_RTNL(); 1759 1760 if ((idev = ipv6_find_idev(dev)) == NULL) 1761 return NULL; 1762 1763 /* Add default multicast route */ 1764 addrconf_add_mroute(dev); 1765 1766 /* Add link local route */ 1767 addrconf_add_lroute(dev); 1768 return idev; 1769 } 1770 1771 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1772 { 1773 struct prefix_info *pinfo; 1774 __u32 valid_lft; 1775 __u32 prefered_lft; 1776 int addr_type; 1777 struct inet6_dev *in6_dev; 1778 1779 pinfo = (struct prefix_info *) opt; 1780 1781 if (len < sizeof(struct prefix_info)) { 1782 ADBG(("addrconf: prefix option too short\n")); 1783 return; 1784 } 1785 1786 /* 1787 * Validation checks ([ADDRCONF], page 19) 1788 */ 1789 1790 addr_type = ipv6_addr_type(&pinfo->prefix); 1791 1792 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1793 return; 1794 1795 valid_lft = ntohl(pinfo->valid); 1796 prefered_lft = ntohl(pinfo->prefered); 1797 1798 if (prefered_lft > valid_lft) { 1799 if (net_ratelimit()) 1800 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1801 return; 1802 } 1803 1804 in6_dev = in6_dev_get(dev); 1805 1806 if (in6_dev == NULL) { 1807 if (net_ratelimit()) 1808 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1809 return; 1810 } 1811 1812 /* 1813 * Two things going on here: 1814 * 1) Add routes for on-link prefixes 1815 * 2) Configure prefixes with the auto flag set 1816 */ 1817 1818 if (pinfo->onlink) { 1819 struct rt6_info *rt; 1820 unsigned long rt_expires; 1821 1822 /* Avoid arithmetic overflow. Really, we could 1823 * save rt_expires in seconds, likely valid_lft, 1824 * but it would require division in fib gc, that it 1825 * not good. 1826 */ 1827 if (HZ > USER_HZ) 1828 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1829 else 1830 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1831 1832 if (addrconf_finite_timeout(rt_expires)) 1833 rt_expires *= HZ; 1834 1835 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL, 1836 dev->ifindex, 1); 1837 1838 if (rt && addrconf_is_prefix_route(rt)) { 1839 /* Autoconf prefix route */ 1840 if (valid_lft == 0) { 1841 ip6_del_rt(rt); 1842 rt = NULL; 1843 } else if (addrconf_finite_timeout(rt_expires)) { 1844 /* not infinity */ 1845 rt->rt6i_expires = jiffies + rt_expires; 1846 rt->rt6i_flags |= RTF_EXPIRES; 1847 } else { 1848 rt->rt6i_flags &= ~RTF_EXPIRES; 1849 rt->rt6i_expires = 0; 1850 } 1851 } else if (valid_lft) { 1852 clock_t expires = 0; 1853 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1854 if (addrconf_finite_timeout(rt_expires)) { 1855 /* not infinity */ 1856 flags |= RTF_EXPIRES; 1857 expires = jiffies_to_clock_t(rt_expires); 1858 } 1859 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1860 dev, expires, flags); 1861 } 1862 if (rt) 1863 dst_release(&rt->u.dst); 1864 } 1865 1866 /* Try to figure out our local address for this prefix */ 1867 1868 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1869 struct inet6_ifaddr * ifp; 1870 struct in6_addr addr; 1871 int create = 0, update_lft = 0; 1872 struct net *net = dev_net(dev); 1873 1874 if (pinfo->prefix_len == 64) { 1875 memcpy(&addr, &pinfo->prefix, 8); 1876 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1877 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1878 in6_dev_put(in6_dev); 1879 return; 1880 } 1881 goto ok; 1882 } 1883 if (net_ratelimit()) 1884 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1885 pinfo->prefix_len); 1886 in6_dev_put(in6_dev); 1887 return; 1888 1889 ok: 1890 1891 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1892 1893 if (ifp == NULL && valid_lft) { 1894 int max_addresses = in6_dev->cnf.max_addresses; 1895 u32 addr_flags = 0; 1896 1897 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1898 if (in6_dev->cnf.optimistic_dad && 1899 !net->ipv6.devconf_all->forwarding) 1900 addr_flags = IFA_F_OPTIMISTIC; 1901 #endif 1902 1903 /* Do not allow to create too much of autoconfigured 1904 * addresses; this would be too easy way to crash kernel. 1905 */ 1906 if (!max_addresses || 1907 ipv6_count_addresses(in6_dev) < max_addresses) 1908 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1909 addr_type&IPV6_ADDR_SCOPE_MASK, 1910 addr_flags); 1911 1912 if (!ifp || IS_ERR(ifp)) { 1913 in6_dev_put(in6_dev); 1914 return; 1915 } 1916 1917 update_lft = create = 1; 1918 ifp->cstamp = jiffies; 1919 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1920 } 1921 1922 if (ifp) { 1923 int flags; 1924 unsigned long now; 1925 #ifdef CONFIG_IPV6_PRIVACY 1926 struct inet6_ifaddr *ift; 1927 #endif 1928 u32 stored_lft; 1929 1930 /* update lifetime (RFC2462 5.5.3 e) */ 1931 spin_lock(&ifp->lock); 1932 now = jiffies; 1933 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1934 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1935 else 1936 stored_lft = 0; 1937 if (!update_lft && stored_lft) { 1938 if (valid_lft > MIN_VALID_LIFETIME || 1939 valid_lft > stored_lft) 1940 update_lft = 1; 1941 else if (stored_lft <= MIN_VALID_LIFETIME) { 1942 /* valid_lft <= stored_lft is always true */ 1943 /* XXX: IPsec */ 1944 update_lft = 0; 1945 } else { 1946 valid_lft = MIN_VALID_LIFETIME; 1947 if (valid_lft < prefered_lft) 1948 prefered_lft = valid_lft; 1949 update_lft = 1; 1950 } 1951 } 1952 1953 if (update_lft) { 1954 ifp->valid_lft = valid_lft; 1955 ifp->prefered_lft = prefered_lft; 1956 ifp->tstamp = now; 1957 flags = ifp->flags; 1958 ifp->flags &= ~IFA_F_DEPRECATED; 1959 spin_unlock(&ifp->lock); 1960 1961 if (!(flags&IFA_F_TENTATIVE)) 1962 ipv6_ifa_notify(0, ifp); 1963 } else 1964 spin_unlock(&ifp->lock); 1965 1966 #ifdef CONFIG_IPV6_PRIVACY 1967 read_lock_bh(&in6_dev->lock); 1968 /* update all temporary addresses in the list */ 1969 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1970 /* 1971 * When adjusting the lifetimes of an existing 1972 * temporary address, only lower the lifetimes. 1973 * Implementations must not increase the 1974 * lifetimes of an existing temporary address 1975 * when processing a Prefix Information Option. 1976 */ 1977 if (ifp != ift->ifpub) 1978 continue; 1979 1980 spin_lock(&ift->lock); 1981 flags = ift->flags; 1982 if (ift->valid_lft > valid_lft && 1983 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1984 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1985 if (ift->prefered_lft > prefered_lft && 1986 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1987 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1988 spin_unlock(&ift->lock); 1989 if (!(flags&IFA_F_TENTATIVE)) 1990 ipv6_ifa_notify(0, ift); 1991 } 1992 1993 if (create && in6_dev->cnf.use_tempaddr > 0) { 1994 /* 1995 * When a new public address is created as described in [ADDRCONF], 1996 * also create a new temporary address. 1997 */ 1998 read_unlock_bh(&in6_dev->lock); 1999 ipv6_create_tempaddr(ifp, NULL); 2000 } else { 2001 read_unlock_bh(&in6_dev->lock); 2002 } 2003 #endif 2004 in6_ifa_put(ifp); 2005 addrconf_verify(0); 2006 } 2007 } 2008 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2009 in6_dev_put(in6_dev); 2010 } 2011 2012 /* 2013 * Set destination address. 2014 * Special case for SIT interfaces where we create a new "virtual" 2015 * device. 2016 */ 2017 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2018 { 2019 struct in6_ifreq ireq; 2020 struct net_device *dev; 2021 int err = -EINVAL; 2022 2023 rtnl_lock(); 2024 2025 err = -EFAULT; 2026 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2027 goto err_exit; 2028 2029 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2030 2031 err = -ENODEV; 2032 if (dev == NULL) 2033 goto err_exit; 2034 2035 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2036 if (dev->type == ARPHRD_SIT) { 2037 const struct net_device_ops *ops = dev->netdev_ops; 2038 struct ifreq ifr; 2039 struct ip_tunnel_parm p; 2040 2041 err = -EADDRNOTAVAIL; 2042 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2043 goto err_exit; 2044 2045 memset(&p, 0, sizeof(p)); 2046 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2047 p.iph.saddr = 0; 2048 p.iph.version = 4; 2049 p.iph.ihl = 5; 2050 p.iph.protocol = IPPROTO_IPV6; 2051 p.iph.ttl = 64; 2052 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2053 2054 if (ops->ndo_do_ioctl) { 2055 mm_segment_t oldfs = get_fs(); 2056 2057 set_fs(KERNEL_DS); 2058 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2059 set_fs(oldfs); 2060 } else 2061 err = -EOPNOTSUPP; 2062 2063 if (err == 0) { 2064 err = -ENOBUFS; 2065 dev = __dev_get_by_name(net, p.name); 2066 if (!dev) 2067 goto err_exit; 2068 err = dev_open(dev); 2069 } 2070 } 2071 #endif 2072 2073 err_exit: 2074 rtnl_unlock(); 2075 return err; 2076 } 2077 2078 /* 2079 * Manual configuration of address on an interface 2080 */ 2081 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2082 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2083 __u32 valid_lft) 2084 { 2085 struct inet6_ifaddr *ifp; 2086 struct inet6_dev *idev; 2087 struct net_device *dev; 2088 int scope; 2089 u32 flags; 2090 clock_t expires; 2091 unsigned long timeout; 2092 2093 ASSERT_RTNL(); 2094 2095 if (plen > 128) 2096 return -EINVAL; 2097 2098 /* check the lifetime */ 2099 if (!valid_lft || prefered_lft > valid_lft) 2100 return -EINVAL; 2101 2102 dev = __dev_get_by_index(net, ifindex); 2103 if (!dev) 2104 return -ENODEV; 2105 2106 if ((idev = addrconf_add_dev(dev)) == NULL) 2107 return -ENOBUFS; 2108 2109 scope = ipv6_addr_scope(pfx); 2110 2111 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2112 if (addrconf_finite_timeout(timeout)) { 2113 expires = jiffies_to_clock_t(timeout * HZ); 2114 valid_lft = timeout; 2115 flags = RTF_EXPIRES; 2116 } else { 2117 expires = 0; 2118 flags = 0; 2119 ifa_flags |= IFA_F_PERMANENT; 2120 } 2121 2122 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2123 if (addrconf_finite_timeout(timeout)) { 2124 if (timeout == 0) 2125 ifa_flags |= IFA_F_DEPRECATED; 2126 prefered_lft = timeout; 2127 } 2128 2129 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2130 2131 if (!IS_ERR(ifp)) { 2132 spin_lock_bh(&ifp->lock); 2133 ifp->valid_lft = valid_lft; 2134 ifp->prefered_lft = prefered_lft; 2135 ifp->tstamp = jiffies; 2136 spin_unlock_bh(&ifp->lock); 2137 2138 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2139 expires, flags); 2140 /* 2141 * Note that section 3.1 of RFC 4429 indicates 2142 * that the Optimistic flag should not be set for 2143 * manually configured addresses 2144 */ 2145 addrconf_dad_start(ifp, 0); 2146 in6_ifa_put(ifp); 2147 addrconf_verify(0); 2148 return 0; 2149 } 2150 2151 return PTR_ERR(ifp); 2152 } 2153 2154 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2155 unsigned int plen) 2156 { 2157 struct inet6_ifaddr *ifp; 2158 struct inet6_dev *idev; 2159 struct net_device *dev; 2160 2161 if (plen > 128) 2162 return -EINVAL; 2163 2164 dev = __dev_get_by_index(net, ifindex); 2165 if (!dev) 2166 return -ENODEV; 2167 2168 if ((idev = __in6_dev_get(dev)) == NULL) 2169 return -ENXIO; 2170 2171 read_lock_bh(&idev->lock); 2172 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2173 if (ifp->prefix_len == plen && 2174 ipv6_addr_equal(pfx, &ifp->addr)) { 2175 in6_ifa_hold(ifp); 2176 read_unlock_bh(&idev->lock); 2177 2178 ipv6_del_addr(ifp); 2179 2180 /* If the last address is deleted administratively, 2181 disable IPv6 on this interface. 2182 */ 2183 if (idev->addr_list == NULL) 2184 addrconf_ifdown(idev->dev, 1); 2185 return 0; 2186 } 2187 } 2188 read_unlock_bh(&idev->lock); 2189 return -EADDRNOTAVAIL; 2190 } 2191 2192 2193 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2194 { 2195 struct in6_ifreq ireq; 2196 int err; 2197 2198 if (!capable(CAP_NET_ADMIN)) 2199 return -EPERM; 2200 2201 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2202 return -EFAULT; 2203 2204 rtnl_lock(); 2205 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2206 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2207 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2208 rtnl_unlock(); 2209 return err; 2210 } 2211 2212 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2213 { 2214 struct in6_ifreq ireq; 2215 int err; 2216 2217 if (!capable(CAP_NET_ADMIN)) 2218 return -EPERM; 2219 2220 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2221 return -EFAULT; 2222 2223 rtnl_lock(); 2224 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2225 ireq.ifr6_prefixlen); 2226 rtnl_unlock(); 2227 return err; 2228 } 2229 2230 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2231 static void sit_add_v4_addrs(struct inet6_dev *idev) 2232 { 2233 struct inet6_ifaddr * ifp; 2234 struct in6_addr addr; 2235 struct net_device *dev; 2236 struct net *net = dev_net(idev->dev); 2237 int scope; 2238 2239 ASSERT_RTNL(); 2240 2241 memset(&addr, 0, sizeof(struct in6_addr)); 2242 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2243 2244 if (idev->dev->flags&IFF_POINTOPOINT) { 2245 addr.s6_addr32[0] = htonl(0xfe800000); 2246 scope = IFA_LINK; 2247 } else { 2248 scope = IPV6_ADDR_COMPATv4; 2249 } 2250 2251 if (addr.s6_addr32[3]) { 2252 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2253 if (!IS_ERR(ifp)) { 2254 spin_lock_bh(&ifp->lock); 2255 ifp->flags &= ~IFA_F_TENTATIVE; 2256 spin_unlock_bh(&ifp->lock); 2257 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2258 in6_ifa_put(ifp); 2259 } 2260 return; 2261 } 2262 2263 for_each_netdev(net, dev) { 2264 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2265 if (in_dev && (dev->flags & IFF_UP)) { 2266 struct in_ifaddr * ifa; 2267 2268 int flag = scope; 2269 2270 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2271 int plen; 2272 2273 addr.s6_addr32[3] = ifa->ifa_local; 2274 2275 if (ifa->ifa_scope == RT_SCOPE_LINK) 2276 continue; 2277 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2278 if (idev->dev->flags&IFF_POINTOPOINT) 2279 continue; 2280 flag |= IFA_HOST; 2281 } 2282 if (idev->dev->flags&IFF_POINTOPOINT) 2283 plen = 64; 2284 else 2285 plen = 96; 2286 2287 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2288 IFA_F_PERMANENT); 2289 if (!IS_ERR(ifp)) { 2290 spin_lock_bh(&ifp->lock); 2291 ifp->flags &= ~IFA_F_TENTATIVE; 2292 spin_unlock_bh(&ifp->lock); 2293 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2294 in6_ifa_put(ifp); 2295 } 2296 } 2297 } 2298 } 2299 } 2300 #endif 2301 2302 static void init_loopback(struct net_device *dev) 2303 { 2304 struct inet6_dev *idev; 2305 struct inet6_ifaddr * ifp; 2306 2307 /* ::1 */ 2308 2309 ASSERT_RTNL(); 2310 2311 if ((idev = ipv6_find_idev(dev)) == NULL) { 2312 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2313 return; 2314 } 2315 2316 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2317 if (!IS_ERR(ifp)) { 2318 spin_lock_bh(&ifp->lock); 2319 ifp->flags &= ~IFA_F_TENTATIVE; 2320 spin_unlock_bh(&ifp->lock); 2321 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2322 in6_ifa_put(ifp); 2323 } 2324 } 2325 2326 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2327 { 2328 struct inet6_ifaddr * ifp; 2329 u32 addr_flags = IFA_F_PERMANENT; 2330 2331 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2332 if (idev->cnf.optimistic_dad && 2333 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2334 addr_flags |= IFA_F_OPTIMISTIC; 2335 #endif 2336 2337 2338 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2339 if (!IS_ERR(ifp)) { 2340 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2341 addrconf_dad_start(ifp, 0); 2342 in6_ifa_put(ifp); 2343 } 2344 } 2345 2346 static void addrconf_dev_config(struct net_device *dev) 2347 { 2348 struct in6_addr addr; 2349 struct inet6_dev * idev; 2350 2351 ASSERT_RTNL(); 2352 2353 if ((dev->type != ARPHRD_ETHER) && 2354 (dev->type != ARPHRD_FDDI) && 2355 (dev->type != ARPHRD_IEEE802_TR) && 2356 (dev->type != ARPHRD_ARCNET) && 2357 (dev->type != ARPHRD_INFINIBAND)) { 2358 /* Alas, we support only Ethernet autoconfiguration. */ 2359 return; 2360 } 2361 2362 idev = addrconf_add_dev(dev); 2363 if (idev == NULL) 2364 return; 2365 2366 memset(&addr, 0, sizeof(struct in6_addr)); 2367 addr.s6_addr32[0] = htonl(0xFE800000); 2368 2369 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2370 addrconf_add_linklocal(idev, &addr); 2371 } 2372 2373 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2374 static void addrconf_sit_config(struct net_device *dev) 2375 { 2376 struct inet6_dev *idev; 2377 2378 ASSERT_RTNL(); 2379 2380 /* 2381 * Configure the tunnel with one of our IPv4 2382 * addresses... we should configure all of 2383 * our v4 addrs in the tunnel 2384 */ 2385 2386 if ((idev = ipv6_find_idev(dev)) == NULL) { 2387 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2388 return; 2389 } 2390 2391 if (dev->priv_flags & IFF_ISATAP) { 2392 struct in6_addr addr; 2393 2394 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2395 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2396 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2397 addrconf_add_linklocal(idev, &addr); 2398 return; 2399 } 2400 2401 sit_add_v4_addrs(idev); 2402 2403 if (dev->flags&IFF_POINTOPOINT) { 2404 addrconf_add_mroute(dev); 2405 addrconf_add_lroute(dev); 2406 } else 2407 sit_route_add(dev); 2408 } 2409 #endif 2410 2411 static inline int 2412 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2413 { 2414 struct in6_addr lladdr; 2415 2416 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2417 addrconf_add_linklocal(idev, &lladdr); 2418 return 0; 2419 } 2420 return -1; 2421 } 2422 2423 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2424 { 2425 struct net_device *link_dev; 2426 struct net *net = dev_net(idev->dev); 2427 2428 /* first try to inherit the link-local address from the link device */ 2429 if (idev->dev->iflink && 2430 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2431 if (!ipv6_inherit_linklocal(idev, link_dev)) 2432 return; 2433 } 2434 /* then try to inherit it from any device */ 2435 for_each_netdev(net, link_dev) { 2436 if (!ipv6_inherit_linklocal(idev, link_dev)) 2437 return; 2438 } 2439 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2440 } 2441 2442 /* 2443 * Autoconfigure tunnel with a link-local address so routing protocols, 2444 * DHCPv6, MLD etc. can be run over the virtual link 2445 */ 2446 2447 static void addrconf_ip6_tnl_config(struct net_device *dev) 2448 { 2449 struct inet6_dev *idev; 2450 2451 ASSERT_RTNL(); 2452 2453 if ((idev = addrconf_add_dev(dev)) == NULL) { 2454 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2455 return; 2456 } 2457 ip6_tnl_add_linklocal(idev); 2458 } 2459 2460 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2461 void * data) 2462 { 2463 struct net_device *dev = (struct net_device *) data; 2464 struct inet6_dev *idev = __in6_dev_get(dev); 2465 int run_pending = 0; 2466 int err; 2467 2468 switch(event) { 2469 case NETDEV_REGISTER: 2470 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2471 idev = ipv6_add_dev(dev); 2472 if (!idev) 2473 return notifier_from_errno(-ENOMEM); 2474 } 2475 break; 2476 case NETDEV_UP: 2477 case NETDEV_CHANGE: 2478 if (dev->flags & IFF_SLAVE) 2479 break; 2480 2481 if (event == NETDEV_UP) { 2482 if (!addrconf_qdisc_ok(dev)) { 2483 /* device is not ready yet. */ 2484 printk(KERN_INFO 2485 "ADDRCONF(NETDEV_UP): %s: " 2486 "link is not ready\n", 2487 dev->name); 2488 break; 2489 } 2490 2491 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2492 idev = ipv6_add_dev(dev); 2493 2494 if (idev) { 2495 idev->if_flags |= IF_READY; 2496 run_pending = 1; 2497 } 2498 } else { 2499 if (!addrconf_qdisc_ok(dev)) { 2500 /* device is still not ready. */ 2501 break; 2502 } 2503 2504 if (idev) { 2505 if (idev->if_flags & IF_READY) { 2506 /* device is already configured. */ 2507 break; 2508 } 2509 idev->if_flags |= IF_READY; 2510 } 2511 2512 printk(KERN_INFO 2513 "ADDRCONF(NETDEV_CHANGE): %s: " 2514 "link becomes ready\n", 2515 dev->name); 2516 2517 run_pending = 1; 2518 } 2519 2520 switch(dev->type) { 2521 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2522 case ARPHRD_SIT: 2523 addrconf_sit_config(dev); 2524 break; 2525 #endif 2526 case ARPHRD_TUNNEL6: 2527 addrconf_ip6_tnl_config(dev); 2528 break; 2529 case ARPHRD_LOOPBACK: 2530 init_loopback(dev); 2531 break; 2532 2533 default: 2534 addrconf_dev_config(dev); 2535 break; 2536 } 2537 if (idev) { 2538 if (run_pending) 2539 addrconf_dad_run(idev); 2540 2541 /* If the MTU changed during the interface down, when the 2542 interface up, the changed MTU must be reflected in the 2543 idev as well as routers. 2544 */ 2545 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2546 rt6_mtu_change(dev, dev->mtu); 2547 idev->cnf.mtu6 = dev->mtu; 2548 } 2549 idev->tstamp = jiffies; 2550 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2551 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2552 stop IPv6 on this interface. 2553 */ 2554 if (dev->mtu < IPV6_MIN_MTU) 2555 addrconf_ifdown(dev, event != NETDEV_DOWN); 2556 } 2557 break; 2558 2559 case NETDEV_CHANGEMTU: 2560 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2561 rt6_mtu_change(dev, dev->mtu); 2562 idev->cnf.mtu6 = dev->mtu; 2563 break; 2564 } 2565 2566 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2567 idev = ipv6_add_dev(dev); 2568 if (idev) 2569 break; 2570 } 2571 2572 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2573 2574 case NETDEV_DOWN: 2575 case NETDEV_UNREGISTER: 2576 /* 2577 * Remove all addresses from this interface. 2578 */ 2579 addrconf_ifdown(dev, event != NETDEV_DOWN); 2580 break; 2581 2582 case NETDEV_CHANGENAME: 2583 if (idev) { 2584 snmp6_unregister_dev(idev); 2585 addrconf_sysctl_unregister(idev); 2586 addrconf_sysctl_register(idev); 2587 err = snmp6_register_dev(idev); 2588 if (err) 2589 return notifier_from_errno(err); 2590 } 2591 break; 2592 } 2593 2594 return NOTIFY_OK; 2595 } 2596 2597 /* 2598 * addrconf module should be notified of a device going up 2599 */ 2600 static struct notifier_block ipv6_dev_notf = { 2601 .notifier_call = addrconf_notify, 2602 .priority = 0 2603 }; 2604 2605 static int addrconf_ifdown(struct net_device *dev, int how) 2606 { 2607 struct inet6_dev *idev; 2608 struct inet6_ifaddr *ifa, **bifa; 2609 struct net *net = dev_net(dev); 2610 int i; 2611 2612 ASSERT_RTNL(); 2613 2614 rt6_ifdown(net, dev); 2615 neigh_ifdown(&nd_tbl, dev); 2616 2617 idev = __in6_dev_get(dev); 2618 if (idev == NULL) 2619 return -ENODEV; 2620 2621 /* Step 1: remove reference to ipv6 device from parent device. 2622 Do not dev_put! 2623 */ 2624 if (how) { 2625 idev->dead = 1; 2626 2627 /* protected by rtnl_lock */ 2628 rcu_assign_pointer(dev->ip6_ptr, NULL); 2629 2630 /* Step 1.5: remove snmp6 entry */ 2631 snmp6_unregister_dev(idev); 2632 2633 } 2634 2635 /* Step 2: clear hash table */ 2636 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2637 bifa = &inet6_addr_lst[i]; 2638 2639 write_lock_bh(&addrconf_hash_lock); 2640 while ((ifa = *bifa) != NULL) { 2641 if (ifa->idev == idev) { 2642 *bifa = ifa->lst_next; 2643 ifa->lst_next = NULL; 2644 addrconf_del_timer(ifa); 2645 in6_ifa_put(ifa); 2646 continue; 2647 } 2648 bifa = &ifa->lst_next; 2649 } 2650 write_unlock_bh(&addrconf_hash_lock); 2651 } 2652 2653 write_lock_bh(&idev->lock); 2654 2655 /* Step 3: clear flags for stateless addrconf */ 2656 if (!how) 2657 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2658 2659 /* Step 4: clear address list */ 2660 #ifdef CONFIG_IPV6_PRIVACY 2661 if (how && del_timer(&idev->regen_timer)) 2662 in6_dev_put(idev); 2663 2664 /* clear tempaddr list */ 2665 while ((ifa = idev->tempaddr_list) != NULL) { 2666 idev->tempaddr_list = ifa->tmp_next; 2667 ifa->tmp_next = NULL; 2668 ifa->dead = 1; 2669 write_unlock_bh(&idev->lock); 2670 spin_lock_bh(&ifa->lock); 2671 2672 if (ifa->ifpub) { 2673 in6_ifa_put(ifa->ifpub); 2674 ifa->ifpub = NULL; 2675 } 2676 spin_unlock_bh(&ifa->lock); 2677 in6_ifa_put(ifa); 2678 write_lock_bh(&idev->lock); 2679 } 2680 #endif 2681 while ((ifa = idev->addr_list) != NULL) { 2682 idev->addr_list = ifa->if_next; 2683 ifa->if_next = NULL; 2684 ifa->dead = 1; 2685 addrconf_del_timer(ifa); 2686 write_unlock_bh(&idev->lock); 2687 2688 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2689 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2690 in6_ifa_put(ifa); 2691 2692 write_lock_bh(&idev->lock); 2693 } 2694 write_unlock_bh(&idev->lock); 2695 2696 /* Step 5: Discard multicast list */ 2697 2698 if (how) 2699 ipv6_mc_destroy_dev(idev); 2700 else 2701 ipv6_mc_down(idev); 2702 2703 idev->tstamp = jiffies; 2704 2705 /* Shot the device (if unregistered) */ 2706 2707 if (how) { 2708 addrconf_sysctl_unregister(idev); 2709 neigh_parms_release(&nd_tbl, idev->nd_parms); 2710 neigh_ifdown(&nd_tbl, dev); 2711 in6_dev_put(idev); 2712 } 2713 return 0; 2714 } 2715 2716 static void addrconf_rs_timer(unsigned long data) 2717 { 2718 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2719 2720 if (ifp->idev->cnf.forwarding) 2721 goto out; 2722 2723 if (ifp->idev->if_flags & IF_RA_RCVD) { 2724 /* 2725 * Announcement received after solicitation 2726 * was sent 2727 */ 2728 goto out; 2729 } 2730 2731 spin_lock(&ifp->lock); 2732 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2733 /* The wait after the last probe can be shorter */ 2734 addrconf_mod_timer(ifp, AC_RS, 2735 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2736 ifp->idev->cnf.rtr_solicit_delay : 2737 ifp->idev->cnf.rtr_solicit_interval); 2738 spin_unlock(&ifp->lock); 2739 2740 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2741 } else { 2742 spin_unlock(&ifp->lock); 2743 /* 2744 * Note: we do not support deprecated "all on-link" 2745 * assumption any longer. 2746 */ 2747 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2748 ifp->idev->dev->name); 2749 } 2750 2751 out: 2752 in6_ifa_put(ifp); 2753 } 2754 2755 /* 2756 * Duplicate Address Detection 2757 */ 2758 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2759 { 2760 unsigned long rand_num; 2761 struct inet6_dev *idev = ifp->idev; 2762 2763 if (ifp->flags & IFA_F_OPTIMISTIC) 2764 rand_num = 0; 2765 else 2766 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2767 2768 ifp->probes = idev->cnf.dad_transmits; 2769 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2770 } 2771 2772 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2773 { 2774 struct inet6_dev *idev = ifp->idev; 2775 struct net_device *dev = idev->dev; 2776 2777 addrconf_join_solict(dev, &ifp->addr); 2778 2779 net_srandom(ifp->addr.s6_addr32[3]); 2780 2781 read_lock_bh(&idev->lock); 2782 if (ifp->dead) 2783 goto out; 2784 spin_lock_bh(&ifp->lock); 2785 2786 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2787 idev->cnf.accept_dad < 1 || 2788 !(ifp->flags&IFA_F_TENTATIVE) || 2789 ifp->flags & IFA_F_NODAD) { 2790 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2791 spin_unlock_bh(&ifp->lock); 2792 read_unlock_bh(&idev->lock); 2793 2794 addrconf_dad_completed(ifp); 2795 return; 2796 } 2797 2798 if (!(idev->if_flags & IF_READY)) { 2799 spin_unlock_bh(&ifp->lock); 2800 read_unlock_bh(&idev->lock); 2801 /* 2802 * If the defice is not ready: 2803 * - keep it tentative if it is a permanent address. 2804 * - otherwise, kill it. 2805 */ 2806 in6_ifa_hold(ifp); 2807 addrconf_dad_stop(ifp); 2808 return; 2809 } 2810 2811 /* 2812 * Optimistic nodes can start receiving 2813 * Frames right away 2814 */ 2815 if(ifp->flags & IFA_F_OPTIMISTIC) 2816 ip6_ins_rt(ifp->rt); 2817 2818 addrconf_dad_kick(ifp); 2819 spin_unlock_bh(&ifp->lock); 2820 out: 2821 read_unlock_bh(&idev->lock); 2822 } 2823 2824 static void addrconf_dad_timer(unsigned long data) 2825 { 2826 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2827 struct inet6_dev *idev = ifp->idev; 2828 struct in6_addr mcaddr; 2829 2830 read_lock_bh(&idev->lock); 2831 if (idev->dead) { 2832 read_unlock_bh(&idev->lock); 2833 goto out; 2834 } 2835 if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) { 2836 read_unlock_bh(&idev->lock); 2837 addrconf_dad_failure(ifp); 2838 return; 2839 } 2840 spin_lock_bh(&ifp->lock); 2841 if (ifp->probes == 0) { 2842 /* 2843 * DAD was successful 2844 */ 2845 2846 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2847 spin_unlock_bh(&ifp->lock); 2848 read_unlock_bh(&idev->lock); 2849 2850 addrconf_dad_completed(ifp); 2851 2852 goto out; 2853 } 2854 2855 ifp->probes--; 2856 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2857 spin_unlock_bh(&ifp->lock); 2858 read_unlock_bh(&idev->lock); 2859 2860 /* send a neighbour solicitation for our addr */ 2861 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2862 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2863 out: 2864 in6_ifa_put(ifp); 2865 } 2866 2867 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2868 { 2869 struct net_device * dev = ifp->idev->dev; 2870 2871 /* 2872 * Configure the address for reception. Now it is valid. 2873 */ 2874 2875 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2876 2877 /* If added prefix is link local and forwarding is off, 2878 start sending router solicitations. 2879 */ 2880 2881 if (ifp->idev->cnf.forwarding == 0 && 2882 ifp->idev->cnf.rtr_solicits > 0 && 2883 (dev->flags&IFF_LOOPBACK) == 0 && 2884 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2885 /* 2886 * If a host as already performed a random delay 2887 * [...] as part of DAD [...] there is no need 2888 * to delay again before sending the first RS 2889 */ 2890 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2891 2892 spin_lock_bh(&ifp->lock); 2893 ifp->probes = 1; 2894 ifp->idev->if_flags |= IF_RS_SENT; 2895 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2896 spin_unlock_bh(&ifp->lock); 2897 } 2898 } 2899 2900 static void addrconf_dad_run(struct inet6_dev *idev) { 2901 struct inet6_ifaddr *ifp; 2902 2903 read_lock_bh(&idev->lock); 2904 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2905 spin_lock_bh(&ifp->lock); 2906 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2907 spin_unlock_bh(&ifp->lock); 2908 continue; 2909 } 2910 spin_unlock_bh(&ifp->lock); 2911 addrconf_dad_kick(ifp); 2912 } 2913 read_unlock_bh(&idev->lock); 2914 } 2915 2916 #ifdef CONFIG_PROC_FS 2917 struct if6_iter_state { 2918 struct seq_net_private p; 2919 int bucket; 2920 }; 2921 2922 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2923 { 2924 struct inet6_ifaddr *ifa = NULL; 2925 struct if6_iter_state *state = seq->private; 2926 struct net *net = seq_file_net(seq); 2927 2928 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2929 ifa = inet6_addr_lst[state->bucket]; 2930 2931 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2932 ifa = ifa->lst_next; 2933 if (ifa) 2934 break; 2935 } 2936 return ifa; 2937 } 2938 2939 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2940 { 2941 struct if6_iter_state *state = seq->private; 2942 struct net *net = seq_file_net(seq); 2943 2944 ifa = ifa->lst_next; 2945 try_again: 2946 if (ifa) { 2947 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2948 ifa = ifa->lst_next; 2949 goto try_again; 2950 } 2951 } 2952 2953 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2954 ifa = inet6_addr_lst[state->bucket]; 2955 goto try_again; 2956 } 2957 2958 return ifa; 2959 } 2960 2961 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2962 { 2963 struct inet6_ifaddr *ifa = if6_get_first(seq); 2964 2965 if (ifa) 2966 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2967 --pos; 2968 return pos ? NULL : ifa; 2969 } 2970 2971 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2972 __acquires(addrconf_hash_lock) 2973 { 2974 read_lock_bh(&addrconf_hash_lock); 2975 return if6_get_idx(seq, *pos); 2976 } 2977 2978 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2979 { 2980 struct inet6_ifaddr *ifa; 2981 2982 ifa = if6_get_next(seq, v); 2983 ++*pos; 2984 return ifa; 2985 } 2986 2987 static void if6_seq_stop(struct seq_file *seq, void *v) 2988 __releases(addrconf_hash_lock) 2989 { 2990 read_unlock_bh(&addrconf_hash_lock); 2991 } 2992 2993 static int if6_seq_show(struct seq_file *seq, void *v) 2994 { 2995 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2996 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 2997 &ifp->addr, 2998 ifp->idev->dev->ifindex, 2999 ifp->prefix_len, 3000 ifp->scope, 3001 ifp->flags, 3002 ifp->idev->dev->name); 3003 return 0; 3004 } 3005 3006 static const struct seq_operations if6_seq_ops = { 3007 .start = if6_seq_start, 3008 .next = if6_seq_next, 3009 .show = if6_seq_show, 3010 .stop = if6_seq_stop, 3011 }; 3012 3013 static int if6_seq_open(struct inode *inode, struct file *file) 3014 { 3015 return seq_open_net(inode, file, &if6_seq_ops, 3016 sizeof(struct if6_iter_state)); 3017 } 3018 3019 static const struct file_operations if6_fops = { 3020 .owner = THIS_MODULE, 3021 .open = if6_seq_open, 3022 .read = seq_read, 3023 .llseek = seq_lseek, 3024 .release = seq_release_net, 3025 }; 3026 3027 static int if6_proc_net_init(struct net *net) 3028 { 3029 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3030 return -ENOMEM; 3031 return 0; 3032 } 3033 3034 static void if6_proc_net_exit(struct net *net) 3035 { 3036 proc_net_remove(net, "if_inet6"); 3037 } 3038 3039 static struct pernet_operations if6_proc_net_ops = { 3040 .init = if6_proc_net_init, 3041 .exit = if6_proc_net_exit, 3042 }; 3043 3044 int __init if6_proc_init(void) 3045 { 3046 return register_pernet_subsys(&if6_proc_net_ops); 3047 } 3048 3049 void if6_proc_exit(void) 3050 { 3051 unregister_pernet_subsys(&if6_proc_net_ops); 3052 } 3053 #endif /* CONFIG_PROC_FS */ 3054 3055 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3056 /* Check if address is a home address configured on any interface. */ 3057 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3058 { 3059 int ret = 0; 3060 struct inet6_ifaddr * ifp; 3061 u8 hash = ipv6_addr_hash(addr); 3062 read_lock_bh(&addrconf_hash_lock); 3063 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 3064 if (!net_eq(dev_net(ifp->idev->dev), net)) 3065 continue; 3066 if (ipv6_addr_equal(&ifp->addr, addr) && 3067 (ifp->flags & IFA_F_HOMEADDRESS)) { 3068 ret = 1; 3069 break; 3070 } 3071 } 3072 read_unlock_bh(&addrconf_hash_lock); 3073 return ret; 3074 } 3075 #endif 3076 3077 /* 3078 * Periodic address status verification 3079 */ 3080 3081 static void addrconf_verify(unsigned long foo) 3082 { 3083 struct inet6_ifaddr *ifp; 3084 unsigned long now, next; 3085 int i; 3086 3087 spin_lock_bh(&addrconf_verify_lock); 3088 now = jiffies; 3089 next = now + ADDR_CHECK_FREQUENCY; 3090 3091 del_timer(&addr_chk_timer); 3092 3093 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3094 3095 restart: 3096 read_lock(&addrconf_hash_lock); 3097 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3098 unsigned long age; 3099 #ifdef CONFIG_IPV6_PRIVACY 3100 unsigned long regen_advance; 3101 #endif 3102 3103 if (ifp->flags & IFA_F_PERMANENT) 3104 continue; 3105 3106 spin_lock(&ifp->lock); 3107 age = (now - ifp->tstamp) / HZ; 3108 3109 #ifdef CONFIG_IPV6_PRIVACY 3110 regen_advance = ifp->idev->cnf.regen_max_retry * 3111 ifp->idev->cnf.dad_transmits * 3112 ifp->idev->nd_parms->retrans_time / HZ; 3113 #endif 3114 3115 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3116 age >= ifp->valid_lft) { 3117 spin_unlock(&ifp->lock); 3118 in6_ifa_hold(ifp); 3119 read_unlock(&addrconf_hash_lock); 3120 ipv6_del_addr(ifp); 3121 goto restart; 3122 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3123 spin_unlock(&ifp->lock); 3124 continue; 3125 } else if (age >= ifp->prefered_lft) { 3126 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 3127 int deprecate = 0; 3128 3129 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3130 deprecate = 1; 3131 ifp->flags |= IFA_F_DEPRECATED; 3132 } 3133 3134 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3135 next = ifp->tstamp + ifp->valid_lft * HZ; 3136 3137 spin_unlock(&ifp->lock); 3138 3139 if (deprecate) { 3140 in6_ifa_hold(ifp); 3141 read_unlock(&addrconf_hash_lock); 3142 3143 ipv6_ifa_notify(0, ifp); 3144 in6_ifa_put(ifp); 3145 goto restart; 3146 } 3147 #ifdef CONFIG_IPV6_PRIVACY 3148 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3149 !(ifp->flags&IFA_F_TENTATIVE)) { 3150 if (age >= ifp->prefered_lft - regen_advance) { 3151 struct inet6_ifaddr *ifpub = ifp->ifpub; 3152 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3153 next = ifp->tstamp + ifp->prefered_lft * HZ; 3154 if (!ifp->regen_count && ifpub) { 3155 ifp->regen_count++; 3156 in6_ifa_hold(ifp); 3157 in6_ifa_hold(ifpub); 3158 spin_unlock(&ifp->lock); 3159 read_unlock(&addrconf_hash_lock); 3160 spin_lock(&ifpub->lock); 3161 ifpub->regen_count = 0; 3162 spin_unlock(&ifpub->lock); 3163 ipv6_create_tempaddr(ifpub, ifp); 3164 in6_ifa_put(ifpub); 3165 in6_ifa_put(ifp); 3166 goto restart; 3167 } 3168 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3169 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3170 spin_unlock(&ifp->lock); 3171 #endif 3172 } else { 3173 /* ifp->prefered_lft <= ifp->valid_lft */ 3174 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3175 next = ifp->tstamp + ifp->prefered_lft * HZ; 3176 spin_unlock(&ifp->lock); 3177 } 3178 } 3179 read_unlock(&addrconf_hash_lock); 3180 } 3181 3182 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3183 add_timer(&addr_chk_timer); 3184 spin_unlock_bh(&addrconf_verify_lock); 3185 } 3186 3187 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3188 { 3189 struct in6_addr *pfx = NULL; 3190 3191 if (addr) 3192 pfx = nla_data(addr); 3193 3194 if (local) { 3195 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3196 pfx = NULL; 3197 else 3198 pfx = nla_data(local); 3199 } 3200 3201 return pfx; 3202 } 3203 3204 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3205 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3206 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3207 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3208 }; 3209 3210 static int 3211 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3212 { 3213 struct net *net = sock_net(skb->sk); 3214 struct ifaddrmsg *ifm; 3215 struct nlattr *tb[IFA_MAX+1]; 3216 struct in6_addr *pfx; 3217 int err; 3218 3219 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3220 if (err < 0) 3221 return err; 3222 3223 ifm = nlmsg_data(nlh); 3224 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3225 if (pfx == NULL) 3226 return -EINVAL; 3227 3228 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3229 } 3230 3231 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3232 u32 prefered_lft, u32 valid_lft) 3233 { 3234 u32 flags; 3235 clock_t expires; 3236 unsigned long timeout; 3237 3238 if (!valid_lft || (prefered_lft > valid_lft)) 3239 return -EINVAL; 3240 3241 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3242 if (addrconf_finite_timeout(timeout)) { 3243 expires = jiffies_to_clock_t(timeout * HZ); 3244 valid_lft = timeout; 3245 flags = RTF_EXPIRES; 3246 } else { 3247 expires = 0; 3248 flags = 0; 3249 ifa_flags |= IFA_F_PERMANENT; 3250 } 3251 3252 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3253 if (addrconf_finite_timeout(timeout)) { 3254 if (timeout == 0) 3255 ifa_flags |= IFA_F_DEPRECATED; 3256 prefered_lft = timeout; 3257 } 3258 3259 spin_lock_bh(&ifp->lock); 3260 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3261 ifp->tstamp = jiffies; 3262 ifp->valid_lft = valid_lft; 3263 ifp->prefered_lft = prefered_lft; 3264 3265 spin_unlock_bh(&ifp->lock); 3266 if (!(ifp->flags&IFA_F_TENTATIVE)) 3267 ipv6_ifa_notify(0, ifp); 3268 3269 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3270 expires, flags); 3271 addrconf_verify(0); 3272 3273 return 0; 3274 } 3275 3276 static int 3277 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3278 { 3279 struct net *net = sock_net(skb->sk); 3280 struct ifaddrmsg *ifm; 3281 struct nlattr *tb[IFA_MAX+1]; 3282 struct in6_addr *pfx; 3283 struct inet6_ifaddr *ifa; 3284 struct net_device *dev; 3285 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3286 u8 ifa_flags; 3287 int err; 3288 3289 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3290 if (err < 0) 3291 return err; 3292 3293 ifm = nlmsg_data(nlh); 3294 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3295 if (pfx == NULL) 3296 return -EINVAL; 3297 3298 if (tb[IFA_CACHEINFO]) { 3299 struct ifa_cacheinfo *ci; 3300 3301 ci = nla_data(tb[IFA_CACHEINFO]); 3302 valid_lft = ci->ifa_valid; 3303 preferred_lft = ci->ifa_prefered; 3304 } else { 3305 preferred_lft = INFINITY_LIFE_TIME; 3306 valid_lft = INFINITY_LIFE_TIME; 3307 } 3308 3309 dev = __dev_get_by_index(net, ifm->ifa_index); 3310 if (dev == NULL) 3311 return -ENODEV; 3312 3313 /* We ignore other flags so far. */ 3314 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3315 3316 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3317 if (ifa == NULL) { 3318 /* 3319 * It would be best to check for !NLM_F_CREATE here but 3320 * userspace alreay relies on not having to provide this. 3321 */ 3322 return inet6_addr_add(net, ifm->ifa_index, pfx, 3323 ifm->ifa_prefixlen, ifa_flags, 3324 preferred_lft, valid_lft); 3325 } 3326 3327 if (nlh->nlmsg_flags & NLM_F_EXCL || 3328 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3329 err = -EEXIST; 3330 else 3331 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3332 3333 in6_ifa_put(ifa); 3334 3335 return err; 3336 } 3337 3338 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3339 u8 scope, int ifindex) 3340 { 3341 struct ifaddrmsg *ifm; 3342 3343 ifm = nlmsg_data(nlh); 3344 ifm->ifa_family = AF_INET6; 3345 ifm->ifa_prefixlen = prefixlen; 3346 ifm->ifa_flags = flags; 3347 ifm->ifa_scope = scope; 3348 ifm->ifa_index = ifindex; 3349 } 3350 3351 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3352 unsigned long tstamp, u32 preferred, u32 valid) 3353 { 3354 struct ifa_cacheinfo ci; 3355 3356 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3357 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3358 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3359 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3360 ci.ifa_prefered = preferred; 3361 ci.ifa_valid = valid; 3362 3363 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3364 } 3365 3366 static inline int rt_scope(int ifa_scope) 3367 { 3368 if (ifa_scope & IFA_HOST) 3369 return RT_SCOPE_HOST; 3370 else if (ifa_scope & IFA_LINK) 3371 return RT_SCOPE_LINK; 3372 else if (ifa_scope & IFA_SITE) 3373 return RT_SCOPE_SITE; 3374 else 3375 return RT_SCOPE_UNIVERSE; 3376 } 3377 3378 static inline int inet6_ifaddr_msgsize(void) 3379 { 3380 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3381 + nla_total_size(16) /* IFA_ADDRESS */ 3382 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3383 } 3384 3385 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3386 u32 pid, u32 seq, int event, unsigned int flags) 3387 { 3388 struct nlmsghdr *nlh; 3389 u32 preferred, valid; 3390 3391 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3392 if (nlh == NULL) 3393 return -EMSGSIZE; 3394 3395 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3396 ifa->idev->dev->ifindex); 3397 3398 if (!(ifa->flags&IFA_F_PERMANENT)) { 3399 preferred = ifa->prefered_lft; 3400 valid = ifa->valid_lft; 3401 if (preferred != INFINITY_LIFE_TIME) { 3402 long tval = (jiffies - ifa->tstamp)/HZ; 3403 preferred -= tval; 3404 if (valid != INFINITY_LIFE_TIME) 3405 valid -= tval; 3406 } 3407 } else { 3408 preferred = INFINITY_LIFE_TIME; 3409 valid = INFINITY_LIFE_TIME; 3410 } 3411 3412 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3413 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3414 nlmsg_cancel(skb, nlh); 3415 return -EMSGSIZE; 3416 } 3417 3418 return nlmsg_end(skb, nlh); 3419 } 3420 3421 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3422 u32 pid, u32 seq, int event, u16 flags) 3423 { 3424 struct nlmsghdr *nlh; 3425 u8 scope = RT_SCOPE_UNIVERSE; 3426 int ifindex = ifmca->idev->dev->ifindex; 3427 3428 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3429 scope = RT_SCOPE_SITE; 3430 3431 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3432 if (nlh == NULL) 3433 return -EMSGSIZE; 3434 3435 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3436 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3437 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3438 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3439 nlmsg_cancel(skb, nlh); 3440 return -EMSGSIZE; 3441 } 3442 3443 return nlmsg_end(skb, nlh); 3444 } 3445 3446 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3447 u32 pid, u32 seq, int event, unsigned int flags) 3448 { 3449 struct nlmsghdr *nlh; 3450 u8 scope = RT_SCOPE_UNIVERSE; 3451 int ifindex = ifaca->aca_idev->dev->ifindex; 3452 3453 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3454 scope = RT_SCOPE_SITE; 3455 3456 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3457 if (nlh == NULL) 3458 return -EMSGSIZE; 3459 3460 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3461 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3462 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3463 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3464 nlmsg_cancel(skb, nlh); 3465 return -EMSGSIZE; 3466 } 3467 3468 return nlmsg_end(skb, nlh); 3469 } 3470 3471 enum addr_type_t 3472 { 3473 UNICAST_ADDR, 3474 MULTICAST_ADDR, 3475 ANYCAST_ADDR, 3476 }; 3477 3478 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3479 enum addr_type_t type) 3480 { 3481 int idx, ip_idx; 3482 int s_idx, s_ip_idx; 3483 int err = 1; 3484 struct net_device *dev; 3485 struct inet6_dev *idev = NULL; 3486 struct inet6_ifaddr *ifa; 3487 struct ifmcaddr6 *ifmca; 3488 struct ifacaddr6 *ifaca; 3489 struct net *net = sock_net(skb->sk); 3490 3491 s_idx = cb->args[0]; 3492 s_ip_idx = ip_idx = cb->args[1]; 3493 3494 idx = 0; 3495 for_each_netdev(net, dev) { 3496 if (idx < s_idx) 3497 goto cont; 3498 if (idx > s_idx) 3499 s_ip_idx = 0; 3500 ip_idx = 0; 3501 if ((idev = in6_dev_get(dev)) == NULL) 3502 goto cont; 3503 read_lock_bh(&idev->lock); 3504 switch (type) { 3505 case UNICAST_ADDR: 3506 /* unicast address incl. temp addr */ 3507 for (ifa = idev->addr_list; ifa; 3508 ifa = ifa->if_next, ip_idx++) { 3509 if (ip_idx < s_ip_idx) 3510 continue; 3511 err = inet6_fill_ifaddr(skb, ifa, 3512 NETLINK_CB(cb->skb).pid, 3513 cb->nlh->nlmsg_seq, 3514 RTM_NEWADDR, 3515 NLM_F_MULTI); 3516 } 3517 break; 3518 case MULTICAST_ADDR: 3519 /* multicast address */ 3520 for (ifmca = idev->mc_list; ifmca; 3521 ifmca = ifmca->next, ip_idx++) { 3522 if (ip_idx < s_ip_idx) 3523 continue; 3524 err = inet6_fill_ifmcaddr(skb, ifmca, 3525 NETLINK_CB(cb->skb).pid, 3526 cb->nlh->nlmsg_seq, 3527 RTM_GETMULTICAST, 3528 NLM_F_MULTI); 3529 } 3530 break; 3531 case ANYCAST_ADDR: 3532 /* anycast address */ 3533 for (ifaca = idev->ac_list; ifaca; 3534 ifaca = ifaca->aca_next, ip_idx++) { 3535 if (ip_idx < s_ip_idx) 3536 continue; 3537 err = inet6_fill_ifacaddr(skb, ifaca, 3538 NETLINK_CB(cb->skb).pid, 3539 cb->nlh->nlmsg_seq, 3540 RTM_GETANYCAST, 3541 NLM_F_MULTI); 3542 } 3543 break; 3544 default: 3545 break; 3546 } 3547 read_unlock_bh(&idev->lock); 3548 in6_dev_put(idev); 3549 3550 if (err <= 0) 3551 break; 3552 cont: 3553 idx++; 3554 } 3555 cb->args[0] = idx; 3556 cb->args[1] = ip_idx; 3557 return skb->len; 3558 } 3559 3560 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3561 { 3562 enum addr_type_t type = UNICAST_ADDR; 3563 3564 return inet6_dump_addr(skb, cb, type); 3565 } 3566 3567 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3568 { 3569 enum addr_type_t type = MULTICAST_ADDR; 3570 3571 return inet6_dump_addr(skb, cb, type); 3572 } 3573 3574 3575 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3576 { 3577 enum addr_type_t type = ANYCAST_ADDR; 3578 3579 return inet6_dump_addr(skb, cb, type); 3580 } 3581 3582 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3583 void *arg) 3584 { 3585 struct net *net = sock_net(in_skb->sk); 3586 struct ifaddrmsg *ifm; 3587 struct nlattr *tb[IFA_MAX+1]; 3588 struct in6_addr *addr = NULL; 3589 struct net_device *dev = NULL; 3590 struct inet6_ifaddr *ifa; 3591 struct sk_buff *skb; 3592 int err; 3593 3594 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3595 if (err < 0) 3596 goto errout; 3597 3598 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3599 if (addr == NULL) { 3600 err = -EINVAL; 3601 goto errout; 3602 } 3603 3604 ifm = nlmsg_data(nlh); 3605 if (ifm->ifa_index) 3606 dev = __dev_get_by_index(net, ifm->ifa_index); 3607 3608 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3609 err = -EADDRNOTAVAIL; 3610 goto errout; 3611 } 3612 3613 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3614 err = -ENOBUFS; 3615 goto errout_ifa; 3616 } 3617 3618 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3619 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3620 if (err < 0) { 3621 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3622 WARN_ON(err == -EMSGSIZE); 3623 kfree_skb(skb); 3624 goto errout_ifa; 3625 } 3626 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3627 errout_ifa: 3628 in6_ifa_put(ifa); 3629 errout: 3630 return err; 3631 } 3632 3633 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3634 { 3635 struct sk_buff *skb; 3636 struct net *net = dev_net(ifa->idev->dev); 3637 int err = -ENOBUFS; 3638 3639 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3640 if (skb == NULL) 3641 goto errout; 3642 3643 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3644 if (err < 0) { 3645 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3646 WARN_ON(err == -EMSGSIZE); 3647 kfree_skb(skb); 3648 goto errout; 3649 } 3650 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3651 errout: 3652 if (err < 0) 3653 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3654 } 3655 3656 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3657 __s32 *array, int bytes) 3658 { 3659 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3660 3661 memset(array, 0, bytes); 3662 array[DEVCONF_FORWARDING] = cnf->forwarding; 3663 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3664 array[DEVCONF_MTU6] = cnf->mtu6; 3665 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3666 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3667 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3668 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3669 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3670 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3671 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3672 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3673 #ifdef CONFIG_IPV6_PRIVACY 3674 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3675 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3676 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3677 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3678 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3679 #endif 3680 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3681 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3682 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3683 #ifdef CONFIG_IPV6_ROUTER_PREF 3684 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3685 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3686 #ifdef CONFIG_IPV6_ROUTE_INFO 3687 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3688 #endif 3689 #endif 3690 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3691 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3692 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3693 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3694 #endif 3695 #ifdef CONFIG_IPV6_MROUTE 3696 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3697 #endif 3698 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3699 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3700 } 3701 3702 static inline size_t inet6_if_nlmsg_size(void) 3703 { 3704 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3705 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3706 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3707 + nla_total_size(4) /* IFLA_MTU */ 3708 + nla_total_size(4) /* IFLA_LINK */ 3709 + nla_total_size( /* IFLA_PROTINFO */ 3710 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3711 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3712 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3713 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3714 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3715 ); 3716 } 3717 3718 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3719 int bytes) 3720 { 3721 int i; 3722 int pad = bytes - sizeof(u64) * items; 3723 BUG_ON(pad < 0); 3724 3725 /* Use put_unaligned() because stats may not be aligned for u64. */ 3726 put_unaligned(items, &stats[0]); 3727 for (i = 1; i < items; i++) 3728 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3729 3730 memset(&stats[items], 0, pad); 3731 } 3732 3733 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3734 int bytes) 3735 { 3736 switch(attrtype) { 3737 case IFLA_INET6_STATS: 3738 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3739 break; 3740 case IFLA_INET6_ICMP6STATS: 3741 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3742 break; 3743 } 3744 } 3745 3746 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3747 u32 pid, u32 seq, int event, unsigned int flags) 3748 { 3749 struct net_device *dev = idev->dev; 3750 struct nlattr *nla; 3751 struct ifinfomsg *hdr; 3752 struct nlmsghdr *nlh; 3753 void *protoinfo; 3754 struct ifla_cacheinfo ci; 3755 3756 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3757 if (nlh == NULL) 3758 return -EMSGSIZE; 3759 3760 hdr = nlmsg_data(nlh); 3761 hdr->ifi_family = AF_INET6; 3762 hdr->__ifi_pad = 0; 3763 hdr->ifi_type = dev->type; 3764 hdr->ifi_index = dev->ifindex; 3765 hdr->ifi_flags = dev_get_flags(dev); 3766 hdr->ifi_change = 0; 3767 3768 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3769 3770 if (dev->addr_len) 3771 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3772 3773 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3774 if (dev->ifindex != dev->iflink) 3775 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3776 3777 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3778 if (protoinfo == NULL) 3779 goto nla_put_failure; 3780 3781 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3782 3783 ci.max_reasm_len = IPV6_MAXPLEN; 3784 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3785 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3786 ci.reachable_time = idev->nd_parms->reachable_time; 3787 ci.retrans_time = idev->nd_parms->retrans_time; 3788 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3789 3790 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3791 if (nla == NULL) 3792 goto nla_put_failure; 3793 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3794 3795 /* XXX - MC not implemented */ 3796 3797 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3798 if (nla == NULL) 3799 goto nla_put_failure; 3800 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3801 3802 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3803 if (nla == NULL) 3804 goto nla_put_failure; 3805 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3806 3807 nla_nest_end(skb, protoinfo); 3808 return nlmsg_end(skb, nlh); 3809 3810 nla_put_failure: 3811 nlmsg_cancel(skb, nlh); 3812 return -EMSGSIZE; 3813 } 3814 3815 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3816 { 3817 struct net *net = sock_net(skb->sk); 3818 int idx, err; 3819 int s_idx = cb->args[0]; 3820 struct net_device *dev; 3821 struct inet6_dev *idev; 3822 3823 read_lock(&dev_base_lock); 3824 idx = 0; 3825 for_each_netdev(net, dev) { 3826 if (idx < s_idx) 3827 goto cont; 3828 if ((idev = in6_dev_get(dev)) == NULL) 3829 goto cont; 3830 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3831 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3832 in6_dev_put(idev); 3833 if (err <= 0) 3834 break; 3835 cont: 3836 idx++; 3837 } 3838 read_unlock(&dev_base_lock); 3839 cb->args[0] = idx; 3840 3841 return skb->len; 3842 } 3843 3844 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3845 { 3846 struct sk_buff *skb; 3847 struct net *net = dev_net(idev->dev); 3848 int err = -ENOBUFS; 3849 3850 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3851 if (skb == NULL) 3852 goto errout; 3853 3854 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3855 if (err < 0) { 3856 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3857 WARN_ON(err == -EMSGSIZE); 3858 kfree_skb(skb); 3859 goto errout; 3860 } 3861 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3862 errout: 3863 if (err < 0) 3864 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3865 } 3866 3867 static inline size_t inet6_prefix_nlmsg_size(void) 3868 { 3869 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3870 + nla_total_size(sizeof(struct in6_addr)) 3871 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3872 } 3873 3874 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3875 struct prefix_info *pinfo, u32 pid, u32 seq, 3876 int event, unsigned int flags) 3877 { 3878 struct prefixmsg *pmsg; 3879 struct nlmsghdr *nlh; 3880 struct prefix_cacheinfo ci; 3881 3882 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3883 if (nlh == NULL) 3884 return -EMSGSIZE; 3885 3886 pmsg = nlmsg_data(nlh); 3887 pmsg->prefix_family = AF_INET6; 3888 pmsg->prefix_pad1 = 0; 3889 pmsg->prefix_pad2 = 0; 3890 pmsg->prefix_ifindex = idev->dev->ifindex; 3891 pmsg->prefix_len = pinfo->prefix_len; 3892 pmsg->prefix_type = pinfo->type; 3893 pmsg->prefix_pad3 = 0; 3894 pmsg->prefix_flags = 0; 3895 if (pinfo->onlink) 3896 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3897 if (pinfo->autoconf) 3898 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3899 3900 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3901 3902 ci.preferred_time = ntohl(pinfo->prefered); 3903 ci.valid_time = ntohl(pinfo->valid); 3904 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3905 3906 return nlmsg_end(skb, nlh); 3907 3908 nla_put_failure: 3909 nlmsg_cancel(skb, nlh); 3910 return -EMSGSIZE; 3911 } 3912 3913 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3914 struct prefix_info *pinfo) 3915 { 3916 struct sk_buff *skb; 3917 struct net *net = dev_net(idev->dev); 3918 int err = -ENOBUFS; 3919 3920 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3921 if (skb == NULL) 3922 goto errout; 3923 3924 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3925 if (err < 0) { 3926 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3927 WARN_ON(err == -EMSGSIZE); 3928 kfree_skb(skb); 3929 goto errout; 3930 } 3931 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3932 errout: 3933 if (err < 0) 3934 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3935 } 3936 3937 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3938 { 3939 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3940 3941 switch (event) { 3942 case RTM_NEWADDR: 3943 /* 3944 * If the address was optimistic 3945 * we inserted the route at the start of 3946 * our DAD process, so we don't need 3947 * to do it again 3948 */ 3949 if (!(ifp->rt->rt6i_node)) 3950 ip6_ins_rt(ifp->rt); 3951 if (ifp->idev->cnf.forwarding) 3952 addrconf_join_anycast(ifp); 3953 break; 3954 case RTM_DELADDR: 3955 if (ifp->idev->cnf.forwarding) 3956 addrconf_leave_anycast(ifp); 3957 addrconf_leave_solict(ifp->idev, &ifp->addr); 3958 dst_hold(&ifp->rt->u.dst); 3959 if (ip6_del_rt(ifp->rt)) 3960 dst_free(&ifp->rt->u.dst); 3961 break; 3962 } 3963 } 3964 3965 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3966 { 3967 rcu_read_lock_bh(); 3968 if (likely(ifp->idev->dead == 0)) 3969 __ipv6_ifa_notify(event, ifp); 3970 rcu_read_unlock_bh(); 3971 } 3972 3973 #ifdef CONFIG_SYSCTL 3974 3975 static 3976 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3977 void __user *buffer, size_t *lenp, loff_t *ppos) 3978 { 3979 int *valp = ctl->data; 3980 int val = *valp; 3981 int ret; 3982 3983 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3984 3985 if (write) 3986 ret = addrconf_fixup_forwarding(ctl, valp, val); 3987 return ret; 3988 } 3989 3990 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3991 void __user *oldval, 3992 size_t __user *oldlenp, 3993 void __user *newval, size_t newlen) 3994 { 3995 int *valp = table->data; 3996 int val = *valp; 3997 int new; 3998 3999 if (!newval || !newlen) 4000 return 0; 4001 if (newlen != sizeof(int)) 4002 return -EINVAL; 4003 if (get_user(new, (int __user *)newval)) 4004 return -EFAULT; 4005 if (new == *valp) 4006 return 0; 4007 if (oldval && oldlenp) { 4008 size_t len; 4009 if (get_user(len, oldlenp)) 4010 return -EFAULT; 4011 if (len) { 4012 if (len > table->maxlen) 4013 len = table->maxlen; 4014 if (copy_to_user(oldval, valp, len)) 4015 return -EFAULT; 4016 if (put_user(len, oldlenp)) 4017 return -EFAULT; 4018 } 4019 } 4020 4021 *valp = new; 4022 return addrconf_fixup_forwarding(table, valp, val); 4023 } 4024 4025 static struct addrconf_sysctl_table 4026 { 4027 struct ctl_table_header *sysctl_header; 4028 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4029 char *dev_name; 4030 } addrconf_sysctl __read_mostly = { 4031 .sysctl_header = NULL, 4032 .addrconf_vars = { 4033 { 4034 .ctl_name = NET_IPV6_FORWARDING, 4035 .procname = "forwarding", 4036 .data = &ipv6_devconf.forwarding, 4037 .maxlen = sizeof(int), 4038 .mode = 0644, 4039 .proc_handler = addrconf_sysctl_forward, 4040 .strategy = addrconf_sysctl_forward_strategy, 4041 }, 4042 { 4043 .ctl_name = NET_IPV6_HOP_LIMIT, 4044 .procname = "hop_limit", 4045 .data = &ipv6_devconf.hop_limit, 4046 .maxlen = sizeof(int), 4047 .mode = 0644, 4048 .proc_handler = proc_dointvec, 4049 }, 4050 { 4051 .ctl_name = NET_IPV6_MTU, 4052 .procname = "mtu", 4053 .data = &ipv6_devconf.mtu6, 4054 .maxlen = sizeof(int), 4055 .mode = 0644, 4056 .proc_handler = proc_dointvec, 4057 }, 4058 { 4059 .ctl_name = NET_IPV6_ACCEPT_RA, 4060 .procname = "accept_ra", 4061 .data = &ipv6_devconf.accept_ra, 4062 .maxlen = sizeof(int), 4063 .mode = 0644, 4064 .proc_handler = proc_dointvec, 4065 }, 4066 { 4067 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 4068 .procname = "accept_redirects", 4069 .data = &ipv6_devconf.accept_redirects, 4070 .maxlen = sizeof(int), 4071 .mode = 0644, 4072 .proc_handler = proc_dointvec, 4073 }, 4074 { 4075 .ctl_name = NET_IPV6_AUTOCONF, 4076 .procname = "autoconf", 4077 .data = &ipv6_devconf.autoconf, 4078 .maxlen = sizeof(int), 4079 .mode = 0644, 4080 .proc_handler = proc_dointvec, 4081 }, 4082 { 4083 .ctl_name = NET_IPV6_DAD_TRANSMITS, 4084 .procname = "dad_transmits", 4085 .data = &ipv6_devconf.dad_transmits, 4086 .maxlen = sizeof(int), 4087 .mode = 0644, 4088 .proc_handler = proc_dointvec, 4089 }, 4090 { 4091 .ctl_name = NET_IPV6_RTR_SOLICITS, 4092 .procname = "router_solicitations", 4093 .data = &ipv6_devconf.rtr_solicits, 4094 .maxlen = sizeof(int), 4095 .mode = 0644, 4096 .proc_handler = proc_dointvec, 4097 }, 4098 { 4099 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 4100 .procname = "router_solicitation_interval", 4101 .data = &ipv6_devconf.rtr_solicit_interval, 4102 .maxlen = sizeof(int), 4103 .mode = 0644, 4104 .proc_handler = proc_dointvec_jiffies, 4105 .strategy = sysctl_jiffies, 4106 }, 4107 { 4108 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 4109 .procname = "router_solicitation_delay", 4110 .data = &ipv6_devconf.rtr_solicit_delay, 4111 .maxlen = sizeof(int), 4112 .mode = 0644, 4113 .proc_handler = proc_dointvec_jiffies, 4114 .strategy = sysctl_jiffies, 4115 }, 4116 { 4117 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 4118 .procname = "force_mld_version", 4119 .data = &ipv6_devconf.force_mld_version, 4120 .maxlen = sizeof(int), 4121 .mode = 0644, 4122 .proc_handler = proc_dointvec, 4123 }, 4124 #ifdef CONFIG_IPV6_PRIVACY 4125 { 4126 .ctl_name = NET_IPV6_USE_TEMPADDR, 4127 .procname = "use_tempaddr", 4128 .data = &ipv6_devconf.use_tempaddr, 4129 .maxlen = sizeof(int), 4130 .mode = 0644, 4131 .proc_handler = proc_dointvec, 4132 }, 4133 { 4134 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 4135 .procname = "temp_valid_lft", 4136 .data = &ipv6_devconf.temp_valid_lft, 4137 .maxlen = sizeof(int), 4138 .mode = 0644, 4139 .proc_handler = proc_dointvec, 4140 }, 4141 { 4142 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 4143 .procname = "temp_prefered_lft", 4144 .data = &ipv6_devconf.temp_prefered_lft, 4145 .maxlen = sizeof(int), 4146 .mode = 0644, 4147 .proc_handler = proc_dointvec, 4148 }, 4149 { 4150 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4151 .procname = "regen_max_retry", 4152 .data = &ipv6_devconf.regen_max_retry, 4153 .maxlen = sizeof(int), 4154 .mode = 0644, 4155 .proc_handler = proc_dointvec, 4156 }, 4157 { 4158 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4159 .procname = "max_desync_factor", 4160 .data = &ipv6_devconf.max_desync_factor, 4161 .maxlen = sizeof(int), 4162 .mode = 0644, 4163 .proc_handler = proc_dointvec, 4164 }, 4165 #endif 4166 { 4167 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4168 .procname = "max_addresses", 4169 .data = &ipv6_devconf.max_addresses, 4170 .maxlen = sizeof(int), 4171 .mode = 0644, 4172 .proc_handler = proc_dointvec, 4173 }, 4174 { 4175 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4176 .procname = "accept_ra_defrtr", 4177 .data = &ipv6_devconf.accept_ra_defrtr, 4178 .maxlen = sizeof(int), 4179 .mode = 0644, 4180 .proc_handler = proc_dointvec, 4181 }, 4182 { 4183 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4184 .procname = "accept_ra_pinfo", 4185 .data = &ipv6_devconf.accept_ra_pinfo, 4186 .maxlen = sizeof(int), 4187 .mode = 0644, 4188 .proc_handler = proc_dointvec, 4189 }, 4190 #ifdef CONFIG_IPV6_ROUTER_PREF 4191 { 4192 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4193 .procname = "accept_ra_rtr_pref", 4194 .data = &ipv6_devconf.accept_ra_rtr_pref, 4195 .maxlen = sizeof(int), 4196 .mode = 0644, 4197 .proc_handler = proc_dointvec, 4198 }, 4199 { 4200 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4201 .procname = "router_probe_interval", 4202 .data = &ipv6_devconf.rtr_probe_interval, 4203 .maxlen = sizeof(int), 4204 .mode = 0644, 4205 .proc_handler = proc_dointvec_jiffies, 4206 .strategy = sysctl_jiffies, 4207 }, 4208 #ifdef CONFIG_IPV6_ROUTE_INFO 4209 { 4210 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4211 .procname = "accept_ra_rt_info_max_plen", 4212 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4213 .maxlen = sizeof(int), 4214 .mode = 0644, 4215 .proc_handler = proc_dointvec, 4216 }, 4217 #endif 4218 #endif 4219 { 4220 .ctl_name = NET_IPV6_PROXY_NDP, 4221 .procname = "proxy_ndp", 4222 .data = &ipv6_devconf.proxy_ndp, 4223 .maxlen = sizeof(int), 4224 .mode = 0644, 4225 .proc_handler = proc_dointvec, 4226 }, 4227 { 4228 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4229 .procname = "accept_source_route", 4230 .data = &ipv6_devconf.accept_source_route, 4231 .maxlen = sizeof(int), 4232 .mode = 0644, 4233 .proc_handler = proc_dointvec, 4234 }, 4235 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4236 { 4237 .ctl_name = CTL_UNNUMBERED, 4238 .procname = "optimistic_dad", 4239 .data = &ipv6_devconf.optimistic_dad, 4240 .maxlen = sizeof(int), 4241 .mode = 0644, 4242 .proc_handler = proc_dointvec, 4243 4244 }, 4245 #endif 4246 #ifdef CONFIG_IPV6_MROUTE 4247 { 4248 .ctl_name = CTL_UNNUMBERED, 4249 .procname = "mc_forwarding", 4250 .data = &ipv6_devconf.mc_forwarding, 4251 .maxlen = sizeof(int), 4252 .mode = 0444, 4253 .proc_handler = proc_dointvec, 4254 }, 4255 #endif 4256 { 4257 .ctl_name = CTL_UNNUMBERED, 4258 .procname = "disable_ipv6", 4259 .data = &ipv6_devconf.disable_ipv6, 4260 .maxlen = sizeof(int), 4261 .mode = 0644, 4262 .proc_handler = proc_dointvec, 4263 }, 4264 { 4265 .ctl_name = CTL_UNNUMBERED, 4266 .procname = "accept_dad", 4267 .data = &ipv6_devconf.accept_dad, 4268 .maxlen = sizeof(int), 4269 .mode = 0644, 4270 .proc_handler = proc_dointvec, 4271 }, 4272 { 4273 .ctl_name = 0, /* sentinel */ 4274 } 4275 }, 4276 }; 4277 4278 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4279 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4280 { 4281 int i; 4282 struct addrconf_sysctl_table *t; 4283 4284 #define ADDRCONF_CTL_PATH_DEV 3 4285 4286 struct ctl_path addrconf_ctl_path[] = { 4287 { .procname = "net", .ctl_name = CTL_NET, }, 4288 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4289 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4290 { /* to be set */ }, 4291 { }, 4292 }; 4293 4294 4295 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4296 if (t == NULL) 4297 goto out; 4298 4299 for (i=0; t->addrconf_vars[i].data; i++) { 4300 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4301 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4302 t->addrconf_vars[i].extra2 = net; 4303 } 4304 4305 /* 4306 * Make a copy of dev_name, because '.procname' is regarded as const 4307 * by sysctl and we wouldn't want anyone to change it under our feet 4308 * (see SIOCSIFNAME). 4309 */ 4310 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4311 if (!t->dev_name) 4312 goto free; 4313 4314 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4315 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4316 4317 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4318 t->addrconf_vars); 4319 if (t->sysctl_header == NULL) 4320 goto free_procname; 4321 4322 p->sysctl = t; 4323 return 0; 4324 4325 free_procname: 4326 kfree(t->dev_name); 4327 free: 4328 kfree(t); 4329 out: 4330 return -ENOBUFS; 4331 } 4332 4333 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4334 { 4335 struct addrconf_sysctl_table *t; 4336 4337 if (p->sysctl == NULL) 4338 return; 4339 4340 t = p->sysctl; 4341 p->sysctl = NULL; 4342 unregister_sysctl_table(t->sysctl_header); 4343 kfree(t->dev_name); 4344 kfree(t); 4345 } 4346 4347 static void addrconf_sysctl_register(struct inet6_dev *idev) 4348 { 4349 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4350 NET_IPV6_NEIGH, "ipv6", 4351 &ndisc_ifinfo_sysctl_change, 4352 ndisc_ifinfo_sysctl_strategy); 4353 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4354 idev->dev->ifindex, idev, &idev->cnf); 4355 } 4356 4357 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4358 { 4359 __addrconf_sysctl_unregister(&idev->cnf); 4360 neigh_sysctl_unregister(idev->nd_parms); 4361 } 4362 4363 4364 #endif 4365 4366 static int addrconf_init_net(struct net *net) 4367 { 4368 int err; 4369 struct ipv6_devconf *all, *dflt; 4370 4371 err = -ENOMEM; 4372 all = &ipv6_devconf; 4373 dflt = &ipv6_devconf_dflt; 4374 4375 if (net != &init_net) { 4376 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4377 if (all == NULL) 4378 goto err_alloc_all; 4379 4380 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4381 if (dflt == NULL) 4382 goto err_alloc_dflt; 4383 } 4384 4385 net->ipv6.devconf_all = all; 4386 net->ipv6.devconf_dflt = dflt; 4387 4388 #ifdef CONFIG_SYSCTL 4389 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4390 NULL, all); 4391 if (err < 0) 4392 goto err_reg_all; 4393 4394 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4395 NULL, dflt); 4396 if (err < 0) 4397 goto err_reg_dflt; 4398 #endif 4399 return 0; 4400 4401 #ifdef CONFIG_SYSCTL 4402 err_reg_dflt: 4403 __addrconf_sysctl_unregister(all); 4404 err_reg_all: 4405 kfree(dflt); 4406 #endif 4407 err_alloc_dflt: 4408 kfree(all); 4409 err_alloc_all: 4410 return err; 4411 } 4412 4413 static void addrconf_exit_net(struct net *net) 4414 { 4415 #ifdef CONFIG_SYSCTL 4416 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4417 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4418 #endif 4419 if (net != &init_net) { 4420 kfree(net->ipv6.devconf_dflt); 4421 kfree(net->ipv6.devconf_all); 4422 } 4423 } 4424 4425 static struct pernet_operations addrconf_ops = { 4426 .init = addrconf_init_net, 4427 .exit = addrconf_exit_net, 4428 }; 4429 4430 /* 4431 * Device notifier 4432 */ 4433 4434 int register_inet6addr_notifier(struct notifier_block *nb) 4435 { 4436 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4437 } 4438 4439 EXPORT_SYMBOL(register_inet6addr_notifier); 4440 4441 int unregister_inet6addr_notifier(struct notifier_block *nb) 4442 { 4443 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4444 } 4445 4446 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4447 4448 /* 4449 * Init / cleanup code 4450 */ 4451 4452 int __init addrconf_init(void) 4453 { 4454 int err; 4455 4456 if ((err = ipv6_addr_label_init()) < 0) { 4457 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4458 err); 4459 return err; 4460 } 4461 4462 register_pernet_subsys(&addrconf_ops); 4463 4464 /* The addrconf netdev notifier requires that loopback_dev 4465 * has it's ipv6 private information allocated and setup 4466 * before it can bring up and give link-local addresses 4467 * to other devices which are up. 4468 * 4469 * Unfortunately, loopback_dev is not necessarily the first 4470 * entry in the global dev_base list of net devices. In fact, 4471 * it is likely to be the very last entry on that list. 4472 * So this causes the notifier registry below to try and 4473 * give link-local addresses to all devices besides loopback_dev 4474 * first, then loopback_dev, which cases all the non-loopback_dev 4475 * devices to fail to get a link-local address. 4476 * 4477 * So, as a temporary fix, allocate the ipv6 structure for 4478 * loopback_dev first by hand. 4479 * Longer term, all of the dependencies ipv6 has upon the loopback 4480 * device and it being up should be removed. 4481 */ 4482 rtnl_lock(); 4483 if (!ipv6_add_dev(init_net.loopback_dev)) 4484 err = -ENOMEM; 4485 rtnl_unlock(); 4486 if (err) 4487 goto errlo; 4488 4489 register_netdevice_notifier(&ipv6_dev_notf); 4490 4491 addrconf_verify(0); 4492 4493 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4494 if (err < 0) 4495 goto errout; 4496 4497 /* Only the first call to __rtnl_register can fail */ 4498 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4499 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4500 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4501 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4502 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4503 4504 ipv6_addr_label_rtnl_register(); 4505 4506 return 0; 4507 errout: 4508 unregister_netdevice_notifier(&ipv6_dev_notf); 4509 errlo: 4510 unregister_pernet_subsys(&addrconf_ops); 4511 4512 return err; 4513 } 4514 4515 void addrconf_cleanup(void) 4516 { 4517 struct inet6_ifaddr *ifa; 4518 struct net_device *dev; 4519 int i; 4520 4521 unregister_netdevice_notifier(&ipv6_dev_notf); 4522 unregister_pernet_subsys(&addrconf_ops); 4523 4524 rtnl_lock(); 4525 4526 /* clean dev list */ 4527 for_each_netdev(&init_net, dev) { 4528 if (__in6_dev_get(dev) == NULL) 4529 continue; 4530 addrconf_ifdown(dev, 1); 4531 } 4532 addrconf_ifdown(init_net.loopback_dev, 2); 4533 4534 /* 4535 * Check hash table. 4536 */ 4537 write_lock_bh(&addrconf_hash_lock); 4538 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4539 for (ifa=inet6_addr_lst[i]; ifa; ) { 4540 struct inet6_ifaddr *bifa; 4541 4542 bifa = ifa; 4543 ifa = ifa->lst_next; 4544 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4545 /* Do not free it; something is wrong. 4546 Now we can investigate it with debugger. 4547 */ 4548 } 4549 } 4550 write_unlock_bh(&addrconf_hash_lock); 4551 4552 del_timer(&addr_chk_timer); 4553 rtnl_unlock(); 4554 } 4555