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 void 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; 503 504 rtnl_lock(); 505 if (p == &net->ipv6.devconf_all->forwarding) { 506 __s32 newf = net->ipv6.devconf_all->forwarding; 507 net->ipv6.devconf_dflt->forwarding = newf; 508 addrconf_forward_change(net, newf); 509 } else if ((!*p) ^ (!old)) 510 dev_forward_change((struct inet6_dev *)table->extra1); 511 rtnl_unlock(); 512 513 if (*p) 514 rt6_purge_dflt_routers(net); 515 } 516 #endif 517 518 /* Nobody refers to this ifaddr, destroy it */ 519 520 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 521 { 522 WARN_ON(ifp->if_next != NULL); 523 WARN_ON(ifp->lst_next != NULL); 524 525 #ifdef NET_REFCNT_DEBUG 526 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 527 #endif 528 529 in6_dev_put(ifp->idev); 530 531 if (del_timer(&ifp->timer)) 532 printk("Timer is still running, when freeing ifa=%p\n", ifp); 533 534 if (!ifp->dead) { 535 printk("Freeing alive inet6 address %p\n", ifp); 536 return; 537 } 538 dst_release(&ifp->rt->u.dst); 539 540 kfree(ifp); 541 } 542 543 static void 544 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 545 { 546 struct inet6_ifaddr *ifa, **ifap; 547 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 548 549 /* 550 * Each device address list is sorted in order of scope - 551 * global before linklocal. 552 */ 553 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 554 ifap = &ifa->if_next) { 555 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 556 break; 557 } 558 559 ifp->if_next = *ifap; 560 *ifap = ifp; 561 } 562 563 /* 564 * Hash function taken from net_alias.c 565 */ 566 static u8 ipv6_addr_hash(const struct in6_addr *addr) 567 { 568 __u32 word; 569 570 /* 571 * We perform the hash function over the last 64 bits of the address 572 * This will include the IEEE address token on links that support it. 573 */ 574 575 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 576 word ^= (word >> 16); 577 word ^= (word >> 8); 578 579 return ((word ^ (word >> 4)) & 0x0f); 580 } 581 582 /* On success it returns ifp with increased reference count */ 583 584 static struct inet6_ifaddr * 585 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 586 int scope, u32 flags) 587 { 588 struct inet6_ifaddr *ifa = NULL; 589 struct rt6_info *rt; 590 int hash; 591 int err = 0; 592 int addr_type = ipv6_addr_type(addr); 593 594 if (addr_type == IPV6_ADDR_ANY || 595 addr_type & IPV6_ADDR_MULTICAST || 596 (!(idev->dev->flags & IFF_LOOPBACK) && 597 addr_type & IPV6_ADDR_LOOPBACK)) 598 return ERR_PTR(-EADDRNOTAVAIL); 599 600 rcu_read_lock_bh(); 601 if (idev->dead) { 602 err = -ENODEV; /*XXX*/ 603 goto out2; 604 } 605 606 write_lock(&addrconf_hash_lock); 607 608 /* Ignore adding duplicate addresses on an interface */ 609 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 610 ADBG(("ipv6_add_addr: already assigned\n")); 611 err = -EEXIST; 612 goto out; 613 } 614 615 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 616 617 if (ifa == NULL) { 618 ADBG(("ipv6_add_addr: malloc failed\n")); 619 err = -ENOBUFS; 620 goto out; 621 } 622 623 rt = addrconf_dst_alloc(idev, addr, 0); 624 if (IS_ERR(rt)) { 625 err = PTR_ERR(rt); 626 goto out; 627 } 628 629 ipv6_addr_copy(&ifa->addr, addr); 630 631 spin_lock_init(&ifa->lock); 632 init_timer(&ifa->timer); 633 ifa->timer.data = (unsigned long) ifa; 634 ifa->scope = scope; 635 ifa->prefix_len = pfxlen; 636 ifa->flags = flags | IFA_F_TENTATIVE; 637 ifa->cstamp = ifa->tstamp = jiffies; 638 639 ifa->rt = rt; 640 641 /* 642 * part one of RFC 4429, section 3.3 643 * We should not configure an address as 644 * optimistic if we do not yet know the link 645 * layer address of our nexhop router 646 */ 647 648 if (rt->rt6i_nexthop == NULL) 649 ifa->flags &= ~IFA_F_OPTIMISTIC; 650 651 ifa->idev = idev; 652 in6_dev_hold(idev); 653 /* For caller */ 654 in6_ifa_hold(ifa); 655 656 /* Add to big hash table */ 657 hash = ipv6_addr_hash(addr); 658 659 ifa->lst_next = inet6_addr_lst[hash]; 660 inet6_addr_lst[hash] = ifa; 661 in6_ifa_hold(ifa); 662 write_unlock(&addrconf_hash_lock); 663 664 write_lock(&idev->lock); 665 /* Add to inet6_dev unicast addr list. */ 666 ipv6_link_dev_addr(idev, ifa); 667 668 #ifdef CONFIG_IPV6_PRIVACY 669 if (ifa->flags&IFA_F_TEMPORARY) { 670 ifa->tmp_next = idev->tempaddr_list; 671 idev->tempaddr_list = ifa; 672 in6_ifa_hold(ifa); 673 } 674 #endif 675 676 in6_ifa_hold(ifa); 677 write_unlock(&idev->lock); 678 out2: 679 rcu_read_unlock_bh(); 680 681 if (likely(err == 0)) 682 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 683 else { 684 kfree(ifa); 685 ifa = ERR_PTR(err); 686 } 687 688 return ifa; 689 out: 690 write_unlock(&addrconf_hash_lock); 691 goto out2; 692 } 693 694 /* This function wants to get referenced ifp and releases it before return */ 695 696 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 697 { 698 struct inet6_ifaddr *ifa, **ifap; 699 struct inet6_dev *idev = ifp->idev; 700 int hash; 701 int deleted = 0, onlink = 0; 702 unsigned long expires = jiffies; 703 704 hash = ipv6_addr_hash(&ifp->addr); 705 706 ifp->dead = 1; 707 708 write_lock_bh(&addrconf_hash_lock); 709 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 710 ifap = &ifa->lst_next) { 711 if (ifa == ifp) { 712 *ifap = ifa->lst_next; 713 __in6_ifa_put(ifp); 714 ifa->lst_next = NULL; 715 break; 716 } 717 } 718 write_unlock_bh(&addrconf_hash_lock); 719 720 write_lock_bh(&idev->lock); 721 #ifdef CONFIG_IPV6_PRIVACY 722 if (ifp->flags&IFA_F_TEMPORARY) { 723 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 724 ifap = &ifa->tmp_next) { 725 if (ifa == ifp) { 726 *ifap = ifa->tmp_next; 727 if (ifp->ifpub) { 728 in6_ifa_put(ifp->ifpub); 729 ifp->ifpub = NULL; 730 } 731 __in6_ifa_put(ifp); 732 ifa->tmp_next = NULL; 733 break; 734 } 735 } 736 } 737 #endif 738 739 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 740 if (ifa == ifp) { 741 *ifap = ifa->if_next; 742 __in6_ifa_put(ifp); 743 ifa->if_next = NULL; 744 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 745 break; 746 deleted = 1; 747 continue; 748 } else if (ifp->flags & IFA_F_PERMANENT) { 749 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 750 ifp->prefix_len)) { 751 if (ifa->flags & IFA_F_PERMANENT) { 752 onlink = 1; 753 if (deleted) 754 break; 755 } else { 756 unsigned long lifetime; 757 758 if (!onlink) 759 onlink = -1; 760 761 spin_lock(&ifa->lock); 762 763 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 764 /* 765 * Note: Because this address is 766 * not permanent, lifetime < 767 * LONG_MAX / HZ here. 768 */ 769 if (time_before(expires, 770 ifa->tstamp + lifetime * HZ)) 771 expires = ifa->tstamp + lifetime * HZ; 772 spin_unlock(&ifa->lock); 773 } 774 } 775 } 776 ifap = &ifa->if_next; 777 } 778 write_unlock_bh(&idev->lock); 779 780 addrconf_del_timer(ifp); 781 782 ipv6_ifa_notify(RTM_DELADDR, ifp); 783 784 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 785 786 /* 787 * Purge or update corresponding prefix 788 * 789 * 1) we don't purge prefix here if address was not permanent. 790 * prefix is managed by its own lifetime. 791 * 2) if there're no addresses, delete prefix. 792 * 3) if there're still other permanent address(es), 793 * corresponding prefix is still permanent. 794 * 4) otherwise, update prefix lifetime to the 795 * longest valid lifetime among the corresponding 796 * addresses on the device. 797 * Note: subsequent RA will update lifetime. 798 * 799 * --yoshfuji 800 */ 801 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 802 struct in6_addr prefix; 803 struct rt6_info *rt; 804 struct net *net = dev_net(ifp->idev->dev); 805 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 806 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 807 808 if (rt && addrconf_is_prefix_route(rt)) { 809 if (onlink == 0) { 810 ip6_del_rt(rt); 811 rt = NULL; 812 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 813 rt->rt6i_expires = expires; 814 rt->rt6i_flags |= RTF_EXPIRES; 815 } 816 } 817 dst_release(&rt->u.dst); 818 } 819 820 in6_ifa_put(ifp); 821 } 822 823 #ifdef CONFIG_IPV6_PRIVACY 824 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 825 { 826 struct inet6_dev *idev = ifp->idev; 827 struct in6_addr addr, *tmpaddr; 828 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 829 unsigned long regen_advance; 830 int tmp_plen; 831 int ret = 0; 832 int max_addresses; 833 u32 addr_flags; 834 835 write_lock(&idev->lock); 836 if (ift) { 837 spin_lock_bh(&ift->lock); 838 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 839 spin_unlock_bh(&ift->lock); 840 tmpaddr = &addr; 841 } else { 842 tmpaddr = NULL; 843 } 844 retry: 845 in6_dev_hold(idev); 846 if (idev->cnf.use_tempaddr <= 0) { 847 write_unlock(&idev->lock); 848 printk(KERN_INFO 849 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 850 in6_dev_put(idev); 851 ret = -1; 852 goto out; 853 } 854 spin_lock_bh(&ifp->lock); 855 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 856 idev->cnf.use_tempaddr = -1; /*XXX*/ 857 spin_unlock_bh(&ifp->lock); 858 write_unlock(&idev->lock); 859 printk(KERN_WARNING 860 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 861 in6_dev_put(idev); 862 ret = -1; 863 goto out; 864 } 865 in6_ifa_hold(ifp); 866 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 867 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 868 spin_unlock_bh(&ifp->lock); 869 write_unlock(&idev->lock); 870 printk(KERN_WARNING 871 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 872 in6_ifa_put(ifp); 873 in6_dev_put(idev); 874 ret = -1; 875 goto out; 876 } 877 memcpy(&addr.s6_addr[8], idev->rndid, 8); 878 tmp_valid_lft = min_t(__u32, 879 ifp->valid_lft, 880 idev->cnf.temp_valid_lft); 881 tmp_prefered_lft = min_t(__u32, 882 ifp->prefered_lft, 883 idev->cnf.temp_prefered_lft - desync_factor / HZ); 884 tmp_plen = ifp->prefix_len; 885 max_addresses = idev->cnf.max_addresses; 886 tmp_cstamp = ifp->cstamp; 887 tmp_tstamp = ifp->tstamp; 888 spin_unlock_bh(&ifp->lock); 889 890 regen_advance = idev->cnf.regen_max_retry * 891 idev->cnf.dad_transmits * 892 idev->nd_parms->retrans_time / HZ; 893 write_unlock(&idev->lock); 894 895 /* A temporary address is created only if this calculated Preferred 896 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 897 * an implementation must not create a temporary address with a zero 898 * Preferred Lifetime. 899 */ 900 if (tmp_prefered_lft <= regen_advance) { 901 in6_ifa_put(ifp); 902 in6_dev_put(idev); 903 ret = -1; 904 goto out; 905 } 906 907 addr_flags = IFA_F_TEMPORARY; 908 /* set in addrconf_prefix_rcv() */ 909 if (ifp->flags & IFA_F_OPTIMISTIC) 910 addr_flags |= IFA_F_OPTIMISTIC; 911 912 ift = !max_addresses || 913 ipv6_count_addresses(idev) < max_addresses ? 914 ipv6_add_addr(idev, &addr, tmp_plen, 915 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 916 addr_flags) : NULL; 917 if (!ift || IS_ERR(ift)) { 918 in6_ifa_put(ifp); 919 in6_dev_put(idev); 920 printk(KERN_INFO 921 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 922 tmpaddr = &addr; 923 write_lock(&idev->lock); 924 goto retry; 925 } 926 927 spin_lock_bh(&ift->lock); 928 ift->ifpub = ifp; 929 ift->valid_lft = tmp_valid_lft; 930 ift->prefered_lft = tmp_prefered_lft; 931 ift->cstamp = tmp_cstamp; 932 ift->tstamp = tmp_tstamp; 933 spin_unlock_bh(&ift->lock); 934 935 addrconf_dad_start(ift, 0); 936 in6_ifa_put(ift); 937 in6_dev_put(idev); 938 out: 939 return ret; 940 } 941 #endif 942 943 /* 944 * Choose an appropriate source address (RFC3484) 945 */ 946 enum { 947 IPV6_SADDR_RULE_INIT = 0, 948 IPV6_SADDR_RULE_LOCAL, 949 IPV6_SADDR_RULE_SCOPE, 950 IPV6_SADDR_RULE_PREFERRED, 951 #ifdef CONFIG_IPV6_MIP6 952 IPV6_SADDR_RULE_HOA, 953 #endif 954 IPV6_SADDR_RULE_OIF, 955 IPV6_SADDR_RULE_LABEL, 956 #ifdef CONFIG_IPV6_PRIVACY 957 IPV6_SADDR_RULE_PRIVACY, 958 #endif 959 IPV6_SADDR_RULE_ORCHID, 960 IPV6_SADDR_RULE_PREFIX, 961 IPV6_SADDR_RULE_MAX 962 }; 963 964 struct ipv6_saddr_score { 965 int rule; 966 int addr_type; 967 struct inet6_ifaddr *ifa; 968 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 969 int scopedist; 970 int matchlen; 971 }; 972 973 struct ipv6_saddr_dst { 974 const struct in6_addr *addr; 975 int ifindex; 976 int scope; 977 int label; 978 unsigned int prefs; 979 }; 980 981 static inline int ipv6_saddr_preferred(int type) 982 { 983 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 984 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 985 return 1; 986 return 0; 987 } 988 989 static int ipv6_get_saddr_eval(struct net *net, 990 struct ipv6_saddr_score *score, 991 struct ipv6_saddr_dst *dst, 992 int i) 993 { 994 int ret; 995 996 if (i <= score->rule) { 997 switch (i) { 998 case IPV6_SADDR_RULE_SCOPE: 999 ret = score->scopedist; 1000 break; 1001 case IPV6_SADDR_RULE_PREFIX: 1002 ret = score->matchlen; 1003 break; 1004 default: 1005 ret = !!test_bit(i, score->scorebits); 1006 } 1007 goto out; 1008 } 1009 1010 switch (i) { 1011 case IPV6_SADDR_RULE_INIT: 1012 /* Rule 0: remember if hiscore is not ready yet */ 1013 ret = !!score->ifa; 1014 break; 1015 case IPV6_SADDR_RULE_LOCAL: 1016 /* Rule 1: Prefer same address */ 1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1018 break; 1019 case IPV6_SADDR_RULE_SCOPE: 1020 /* Rule 2: Prefer appropriate scope 1021 * 1022 * ret 1023 * ^ 1024 * -1 | d 15 1025 * ---+--+-+---> scope 1026 * | 1027 * | d is scope of the destination. 1028 * B-d | \ 1029 * | \ <- smaller scope is better if 1030 * B-15 | \ if scope is enough for destinaion. 1031 * | ret = B - scope (-1 <= scope >= d <= 15). 1032 * d-C-1 | / 1033 * |/ <- greater is better 1034 * -C / if scope is not enough for destination. 1035 * /| ret = scope - C (-1 <= d < scope <= 15). 1036 * 1037 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1039 * Assume B = 0 and we get C > 29. 1040 */ 1041 ret = __ipv6_addr_src_scope(score->addr_type); 1042 if (ret >= dst->scope) 1043 ret = -ret; 1044 else 1045 ret -= 128; /* 30 is enough */ 1046 score->scopedist = ret; 1047 break; 1048 case IPV6_SADDR_RULE_PREFERRED: 1049 /* Rule 3: Avoid deprecated and optimistic addresses */ 1050 ret = ipv6_saddr_preferred(score->addr_type) || 1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1052 break; 1053 #ifdef CONFIG_IPV6_MIP6 1054 case IPV6_SADDR_RULE_HOA: 1055 { 1056 /* Rule 4: Prefer home address */ 1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1059 break; 1060 } 1061 #endif 1062 case IPV6_SADDR_RULE_OIF: 1063 /* Rule 5: Prefer outgoing interface */ 1064 ret = (!dst->ifindex || 1065 dst->ifindex == score->ifa->idev->dev->ifindex); 1066 break; 1067 case IPV6_SADDR_RULE_LABEL: 1068 /* Rule 6: Prefer matching label */ 1069 ret = ipv6_addr_label(net, 1070 &score->ifa->addr, score->addr_type, 1071 score->ifa->idev->dev->ifindex) == dst->label; 1072 break; 1073 #ifdef CONFIG_IPV6_PRIVACY 1074 case IPV6_SADDR_RULE_PRIVACY: 1075 { 1076 /* Rule 7: Prefer public address 1077 * Note: prefer temprary address if use_tempaddr >= 2 1078 */ 1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1081 score->ifa->idev->cnf.use_tempaddr >= 2; 1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1083 break; 1084 } 1085 #endif 1086 case IPV6_SADDR_RULE_ORCHID: 1087 /* Rule 8-: Prefer ORCHID vs ORCHID or 1088 * non-ORCHID vs non-ORCHID 1089 */ 1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1091 ipv6_addr_orchid(dst->addr)); 1092 break; 1093 case IPV6_SADDR_RULE_PREFIX: 1094 /* Rule 8: Use longest matching prefix */ 1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1096 dst->addr); 1097 break; 1098 default: 1099 ret = 0; 1100 } 1101 1102 if (ret) 1103 __set_bit(i, score->scorebits); 1104 score->rule = i; 1105 out: 1106 return ret; 1107 } 1108 1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1110 const struct in6_addr *daddr, unsigned int prefs, 1111 struct in6_addr *saddr) 1112 { 1113 struct ipv6_saddr_score scores[2], 1114 *score = &scores[0], *hiscore = &scores[1]; 1115 struct ipv6_saddr_dst dst; 1116 struct net_device *dev; 1117 int dst_type; 1118 1119 dst_type = __ipv6_addr_type(daddr); 1120 dst.addr = daddr; 1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1122 dst.scope = __ipv6_addr_src_scope(dst_type); 1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1124 dst.prefs = prefs; 1125 1126 hiscore->rule = -1; 1127 hiscore->ifa = NULL; 1128 1129 read_lock(&dev_base_lock); 1130 rcu_read_lock(); 1131 1132 for_each_netdev(net, dev) { 1133 struct inet6_dev *idev; 1134 1135 /* Candidate Source Address (section 4) 1136 * - multicast and link-local destination address, 1137 * the set of candidate source address MUST only 1138 * include addresses assigned to interfaces 1139 * belonging to the same link as the outgoing 1140 * interface. 1141 * (- For site-local destination addresses, the 1142 * set of candidate source addresses MUST only 1143 * include addresses assigned to interfaces 1144 * belonging to the same site as the outgoing 1145 * interface.) 1146 */ 1147 if (((dst_type & IPV6_ADDR_MULTICAST) || 1148 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1149 dst.ifindex && dev->ifindex != dst.ifindex) 1150 continue; 1151 1152 idev = __in6_dev_get(dev); 1153 if (!idev) 1154 continue; 1155 1156 read_lock_bh(&idev->lock); 1157 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1158 int i; 1159 1160 /* 1161 * - Tentative Address (RFC2462 section 5.4) 1162 * - A tentative address is not considered 1163 * "assigned to an interface" in the traditional 1164 * sense, unless it is also flagged as optimistic. 1165 * - Candidate Source Address (section 4) 1166 * - In any case, anycast addresses, multicast 1167 * addresses, and the unspecified address MUST 1168 * NOT be included in a candidate set. 1169 */ 1170 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1171 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1172 continue; 1173 1174 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1175 1176 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1177 score->addr_type & IPV6_ADDR_MULTICAST)) { 1178 LIMIT_NETDEBUG(KERN_DEBUG 1179 "ADDRCONF: unspecified / multicast address " 1180 "assigned as unicast address on %s", 1181 dev->name); 1182 continue; 1183 } 1184 1185 score->rule = -1; 1186 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1187 1188 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1189 int minihiscore, miniscore; 1190 1191 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1192 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1193 1194 if (minihiscore > miniscore) { 1195 if (i == IPV6_SADDR_RULE_SCOPE && 1196 score->scopedist > 0) { 1197 /* 1198 * special case: 1199 * each remaining entry 1200 * has too small (not enough) 1201 * scope, because ifa entries 1202 * are sorted by their scope 1203 * values. 1204 */ 1205 goto try_nextdev; 1206 } 1207 break; 1208 } else if (minihiscore < miniscore) { 1209 struct ipv6_saddr_score *tmp; 1210 1211 if (hiscore->ifa) 1212 in6_ifa_put(hiscore->ifa); 1213 1214 in6_ifa_hold(score->ifa); 1215 1216 tmp = hiscore; 1217 hiscore = score; 1218 score = tmp; 1219 1220 /* restore our iterator */ 1221 score->ifa = hiscore->ifa; 1222 1223 break; 1224 } 1225 } 1226 } 1227 try_nextdev: 1228 read_unlock_bh(&idev->lock); 1229 } 1230 rcu_read_unlock(); 1231 read_unlock(&dev_base_lock); 1232 1233 if (!hiscore->ifa) 1234 return -EADDRNOTAVAIL; 1235 1236 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1237 in6_ifa_put(hiscore->ifa); 1238 return 0; 1239 } 1240 1241 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1242 1243 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1244 unsigned char banned_flags) 1245 { 1246 struct inet6_dev *idev; 1247 int err = -EADDRNOTAVAIL; 1248 1249 rcu_read_lock(); 1250 if ((idev = __in6_dev_get(dev)) != NULL) { 1251 struct inet6_ifaddr *ifp; 1252 1253 read_lock_bh(&idev->lock); 1254 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1255 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1256 ipv6_addr_copy(addr, &ifp->addr); 1257 err = 0; 1258 break; 1259 } 1260 } 1261 read_unlock_bh(&idev->lock); 1262 } 1263 rcu_read_unlock(); 1264 return err; 1265 } 1266 1267 static int ipv6_count_addresses(struct inet6_dev *idev) 1268 { 1269 int cnt = 0; 1270 struct inet6_ifaddr *ifp; 1271 1272 read_lock_bh(&idev->lock); 1273 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1274 cnt++; 1275 read_unlock_bh(&idev->lock); 1276 return cnt; 1277 } 1278 1279 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1280 struct net_device *dev, int strict) 1281 { 1282 struct inet6_ifaddr * ifp; 1283 u8 hash = ipv6_addr_hash(addr); 1284 1285 read_lock_bh(&addrconf_hash_lock); 1286 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1287 if (!net_eq(dev_net(ifp->idev->dev), net)) 1288 continue; 1289 if (ipv6_addr_equal(&ifp->addr, addr) && 1290 !(ifp->flags&IFA_F_TENTATIVE)) { 1291 if (dev == NULL || ifp->idev->dev == dev || 1292 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1293 break; 1294 } 1295 } 1296 read_unlock_bh(&addrconf_hash_lock); 1297 return ifp != NULL; 1298 } 1299 EXPORT_SYMBOL(ipv6_chk_addr); 1300 1301 static 1302 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1303 struct net_device *dev) 1304 { 1305 struct inet6_ifaddr * ifp; 1306 u8 hash = ipv6_addr_hash(addr); 1307 1308 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1309 if (!net_eq(dev_net(ifp->idev->dev), net)) 1310 continue; 1311 if (ipv6_addr_equal(&ifp->addr, addr)) { 1312 if (dev == NULL || ifp->idev->dev == dev) 1313 break; 1314 } 1315 } 1316 return ifp != NULL; 1317 } 1318 1319 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1320 { 1321 struct inet6_dev *idev; 1322 struct inet6_ifaddr *ifa; 1323 int onlink; 1324 1325 onlink = 0; 1326 rcu_read_lock(); 1327 idev = __in6_dev_get(dev); 1328 if (idev) { 1329 read_lock_bh(&idev->lock); 1330 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1331 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1332 ifa->prefix_len); 1333 if (onlink) 1334 break; 1335 } 1336 read_unlock_bh(&idev->lock); 1337 } 1338 rcu_read_unlock(); 1339 return onlink; 1340 } 1341 1342 EXPORT_SYMBOL(ipv6_chk_prefix); 1343 1344 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1345 struct net_device *dev, int strict) 1346 { 1347 struct inet6_ifaddr * ifp; 1348 u8 hash = ipv6_addr_hash(addr); 1349 1350 read_lock_bh(&addrconf_hash_lock); 1351 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1352 if (!net_eq(dev_net(ifp->idev->dev), net)) 1353 continue; 1354 if (ipv6_addr_equal(&ifp->addr, addr)) { 1355 if (dev == NULL || ifp->idev->dev == dev || 1356 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1357 in6_ifa_hold(ifp); 1358 break; 1359 } 1360 } 1361 } 1362 read_unlock_bh(&addrconf_hash_lock); 1363 1364 return ifp; 1365 } 1366 1367 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1368 { 1369 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1370 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1371 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1372 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1373 int sk_ipv6only = ipv6_only_sock(sk); 1374 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1375 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1376 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1377 1378 if (!sk2_rcv_saddr && !sk_ipv6only) 1379 return 1; 1380 1381 if (addr_type2 == IPV6_ADDR_ANY && 1382 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1383 return 1; 1384 1385 if (addr_type == IPV6_ADDR_ANY && 1386 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1387 return 1; 1388 1389 if (sk2_rcv_saddr6 && 1390 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1391 return 1; 1392 1393 if (addr_type == IPV6_ADDR_MAPPED && 1394 !sk2_ipv6only && 1395 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1396 return 1; 1397 1398 return 0; 1399 } 1400 1401 /* Gets referenced address, destroys ifaddr */ 1402 1403 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1404 { 1405 if (ifp->flags&IFA_F_PERMANENT) { 1406 spin_lock_bh(&ifp->lock); 1407 addrconf_del_timer(ifp); 1408 ifp->flags |= IFA_F_TENTATIVE; 1409 spin_unlock_bh(&ifp->lock); 1410 in6_ifa_put(ifp); 1411 #ifdef CONFIG_IPV6_PRIVACY 1412 } else if (ifp->flags&IFA_F_TEMPORARY) { 1413 struct inet6_ifaddr *ifpub; 1414 spin_lock_bh(&ifp->lock); 1415 ifpub = ifp->ifpub; 1416 if (ifpub) { 1417 in6_ifa_hold(ifpub); 1418 spin_unlock_bh(&ifp->lock); 1419 ipv6_create_tempaddr(ifpub, ifp); 1420 in6_ifa_put(ifpub); 1421 } else { 1422 spin_unlock_bh(&ifp->lock); 1423 } 1424 ipv6_del_addr(ifp); 1425 #endif 1426 } else 1427 ipv6_del_addr(ifp); 1428 } 1429 1430 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1431 { 1432 struct inet6_dev *idev = ifp->idev; 1433 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1434 struct in6_addr addr; 1435 1436 addr.s6_addr32[0] = htonl(0xfe800000); 1437 addr.s6_addr32[1] = 0; 1438 1439 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1440 ipv6_addr_equal(&ifp->addr, &addr)) { 1441 /* DAD failed for link-local based on MAC address */ 1442 idev->cnf.disable_ipv6 = 1; 1443 } 1444 } 1445 1446 if (net_ratelimit()) 1447 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1448 addrconf_dad_stop(ifp); 1449 } 1450 1451 /* Join to solicited addr multicast group. */ 1452 1453 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1454 { 1455 struct in6_addr maddr; 1456 1457 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1458 return; 1459 1460 addrconf_addr_solict_mult(addr, &maddr); 1461 ipv6_dev_mc_inc(dev, &maddr); 1462 } 1463 1464 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1465 { 1466 struct in6_addr maddr; 1467 1468 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1469 return; 1470 1471 addrconf_addr_solict_mult(addr, &maddr); 1472 __ipv6_dev_mc_dec(idev, &maddr); 1473 } 1474 1475 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1476 { 1477 struct in6_addr addr; 1478 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1479 if (ipv6_addr_any(&addr)) 1480 return; 1481 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1482 } 1483 1484 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1485 { 1486 struct in6_addr addr; 1487 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1488 if (ipv6_addr_any(&addr)) 1489 return; 1490 __ipv6_dev_ac_dec(ifp->idev, &addr); 1491 } 1492 1493 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1494 { 1495 if (dev->addr_len != ETH_ALEN) 1496 return -1; 1497 memcpy(eui, dev->dev_addr, 3); 1498 memcpy(eui + 5, dev->dev_addr + 3, 3); 1499 1500 /* 1501 * The zSeries OSA network cards can be shared among various 1502 * OS instances, but the OSA cards have only one MAC address. 1503 * This leads to duplicate address conflicts in conjunction 1504 * with IPv6 if more than one instance uses the same card. 1505 * 1506 * The driver for these cards can deliver a unique 16-bit 1507 * identifier for each instance sharing the same card. It is 1508 * placed instead of 0xFFFE in the interface identifier. The 1509 * "u" bit of the interface identifier is not inverted in this 1510 * case. Hence the resulting interface identifier has local 1511 * scope according to RFC2373. 1512 */ 1513 if (dev->dev_id) { 1514 eui[3] = (dev->dev_id >> 8) & 0xFF; 1515 eui[4] = dev->dev_id & 0xFF; 1516 } else { 1517 eui[3] = 0xFF; 1518 eui[4] = 0xFE; 1519 eui[0] ^= 2; 1520 } 1521 return 0; 1522 } 1523 1524 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1525 { 1526 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1527 if (dev->addr_len != ARCNET_ALEN) 1528 return -1; 1529 memset(eui, 0, 7); 1530 eui[7] = *(u8*)dev->dev_addr; 1531 return 0; 1532 } 1533 1534 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1535 { 1536 if (dev->addr_len != INFINIBAND_ALEN) 1537 return -1; 1538 memcpy(eui, dev->dev_addr + 12, 8); 1539 eui[0] |= 2; 1540 return 0; 1541 } 1542 1543 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1544 { 1545 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1546 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1547 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1548 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1549 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1550 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1551 eui[1] = 0; 1552 eui[2] = 0x5E; 1553 eui[3] = 0xFE; 1554 memcpy(eui + 4, &addr, 4); 1555 return 0; 1556 } 1557 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1558 1559 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1560 { 1561 if (dev->priv_flags & IFF_ISATAP) 1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1563 return -1; 1564 } 1565 1566 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1567 { 1568 switch (dev->type) { 1569 case ARPHRD_ETHER: 1570 case ARPHRD_FDDI: 1571 case ARPHRD_IEEE802_TR: 1572 return addrconf_ifid_eui48(eui, dev); 1573 case ARPHRD_ARCNET: 1574 return addrconf_ifid_arcnet(eui, dev); 1575 case ARPHRD_INFINIBAND: 1576 return addrconf_ifid_infiniband(eui, dev); 1577 case ARPHRD_SIT: 1578 return addrconf_ifid_sit(eui, dev); 1579 } 1580 return -1; 1581 } 1582 1583 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1584 { 1585 int err = -1; 1586 struct inet6_ifaddr *ifp; 1587 1588 read_lock_bh(&idev->lock); 1589 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1590 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1591 memcpy(eui, ifp->addr.s6_addr+8, 8); 1592 err = 0; 1593 break; 1594 } 1595 } 1596 read_unlock_bh(&idev->lock); 1597 return err; 1598 } 1599 1600 #ifdef CONFIG_IPV6_PRIVACY 1601 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1602 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1603 { 1604 regen: 1605 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1606 idev->rndid[0] &= ~0x02; 1607 1608 /* 1609 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1610 * check if generated address is not inappropriate 1611 * 1612 * - Reserved subnet anycast (RFC 2526) 1613 * 11111101 11....11 1xxxxxxx 1614 * - ISATAP (RFC4214) 6.1 1615 * 00-00-5E-FE-xx-xx-xx-xx 1616 * - value 0 1617 * - XXX: already assigned to an address on the device 1618 */ 1619 if (idev->rndid[0] == 0xfd && 1620 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1621 (idev->rndid[7]&0x80)) 1622 goto regen; 1623 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1624 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1625 goto regen; 1626 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1627 goto regen; 1628 } 1629 1630 return 0; 1631 } 1632 1633 static void ipv6_regen_rndid(unsigned long data) 1634 { 1635 struct inet6_dev *idev = (struct inet6_dev *) data; 1636 unsigned long expires; 1637 1638 rcu_read_lock_bh(); 1639 write_lock_bh(&idev->lock); 1640 1641 if (idev->dead) 1642 goto out; 1643 1644 if (__ipv6_regen_rndid(idev) < 0) 1645 goto out; 1646 1647 expires = jiffies + 1648 idev->cnf.temp_prefered_lft * HZ - 1649 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1650 if (time_before(expires, jiffies)) { 1651 printk(KERN_WARNING 1652 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1653 idev->dev->name); 1654 goto out; 1655 } 1656 1657 if (!mod_timer(&idev->regen_timer, expires)) 1658 in6_dev_hold(idev); 1659 1660 out: 1661 write_unlock_bh(&idev->lock); 1662 rcu_read_unlock_bh(); 1663 in6_dev_put(idev); 1664 } 1665 1666 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1667 int ret = 0; 1668 1669 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1670 ret = __ipv6_regen_rndid(idev); 1671 return ret; 1672 } 1673 #endif 1674 1675 /* 1676 * Add prefix route. 1677 */ 1678 1679 static void 1680 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1681 unsigned long expires, u32 flags) 1682 { 1683 struct fib6_config cfg = { 1684 .fc_table = RT6_TABLE_PREFIX, 1685 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1686 .fc_ifindex = dev->ifindex, 1687 .fc_expires = expires, 1688 .fc_dst_len = plen, 1689 .fc_flags = RTF_UP | flags, 1690 .fc_nlinfo.nl_net = dev_net(dev), 1691 .fc_protocol = RTPROT_KERNEL, 1692 }; 1693 1694 ipv6_addr_copy(&cfg.fc_dst, pfx); 1695 1696 /* Prevent useless cloning on PtP SIT. 1697 This thing is done here expecting that the whole 1698 class of non-broadcast devices need not cloning. 1699 */ 1700 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1701 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1702 cfg.fc_flags |= RTF_NONEXTHOP; 1703 #endif 1704 1705 ip6_route_add(&cfg); 1706 } 1707 1708 /* Create "default" multicast route to the interface */ 1709 1710 static void addrconf_add_mroute(struct net_device *dev) 1711 { 1712 struct fib6_config cfg = { 1713 .fc_table = RT6_TABLE_LOCAL, 1714 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1715 .fc_ifindex = dev->ifindex, 1716 .fc_dst_len = 8, 1717 .fc_flags = RTF_UP, 1718 .fc_nlinfo.nl_net = dev_net(dev), 1719 }; 1720 1721 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1722 1723 ip6_route_add(&cfg); 1724 } 1725 1726 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1727 static void sit_route_add(struct net_device *dev) 1728 { 1729 struct fib6_config cfg = { 1730 .fc_table = RT6_TABLE_MAIN, 1731 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1732 .fc_ifindex = dev->ifindex, 1733 .fc_dst_len = 96, 1734 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1735 .fc_nlinfo.nl_net = dev_net(dev), 1736 }; 1737 1738 /* prefix length - 96 bits "::d.d.d.d" */ 1739 ip6_route_add(&cfg); 1740 } 1741 #endif 1742 1743 static void addrconf_add_lroute(struct net_device *dev) 1744 { 1745 struct in6_addr addr; 1746 1747 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1748 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1749 } 1750 1751 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1752 { 1753 struct inet6_dev *idev; 1754 1755 ASSERT_RTNL(); 1756 1757 if ((idev = ipv6_find_idev(dev)) == NULL) 1758 return NULL; 1759 1760 /* Add default multicast route */ 1761 addrconf_add_mroute(dev); 1762 1763 /* Add link local route */ 1764 addrconf_add_lroute(dev); 1765 return idev; 1766 } 1767 1768 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1769 { 1770 struct prefix_info *pinfo; 1771 __u32 valid_lft; 1772 __u32 prefered_lft; 1773 int addr_type; 1774 struct inet6_dev *in6_dev; 1775 1776 pinfo = (struct prefix_info *) opt; 1777 1778 if (len < sizeof(struct prefix_info)) { 1779 ADBG(("addrconf: prefix option too short\n")); 1780 return; 1781 } 1782 1783 /* 1784 * Validation checks ([ADDRCONF], page 19) 1785 */ 1786 1787 addr_type = ipv6_addr_type(&pinfo->prefix); 1788 1789 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1790 return; 1791 1792 valid_lft = ntohl(pinfo->valid); 1793 prefered_lft = ntohl(pinfo->prefered); 1794 1795 if (prefered_lft > valid_lft) { 1796 if (net_ratelimit()) 1797 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1798 return; 1799 } 1800 1801 in6_dev = in6_dev_get(dev); 1802 1803 if (in6_dev == NULL) { 1804 if (net_ratelimit()) 1805 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1806 return; 1807 } 1808 1809 /* 1810 * Two things going on here: 1811 * 1) Add routes for on-link prefixes 1812 * 2) Configure prefixes with the auto flag set 1813 */ 1814 1815 if (pinfo->onlink) { 1816 struct rt6_info *rt; 1817 unsigned long rt_expires; 1818 1819 /* Avoid arithmetic overflow. Really, we could 1820 * save rt_expires in seconds, likely valid_lft, 1821 * but it would require division in fib gc, that it 1822 * not good. 1823 */ 1824 if (HZ > USER_HZ) 1825 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1826 else 1827 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1828 1829 if (addrconf_finite_timeout(rt_expires)) 1830 rt_expires *= HZ; 1831 1832 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL, 1833 dev->ifindex, 1); 1834 1835 if (rt && addrconf_is_prefix_route(rt)) { 1836 /* Autoconf prefix route */ 1837 if (valid_lft == 0) { 1838 ip6_del_rt(rt); 1839 rt = NULL; 1840 } else if (addrconf_finite_timeout(rt_expires)) { 1841 /* not infinity */ 1842 rt->rt6i_expires = jiffies + rt_expires; 1843 rt->rt6i_flags |= RTF_EXPIRES; 1844 } else { 1845 rt->rt6i_flags &= ~RTF_EXPIRES; 1846 rt->rt6i_expires = 0; 1847 } 1848 } else if (valid_lft) { 1849 clock_t expires = 0; 1850 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1851 if (addrconf_finite_timeout(rt_expires)) { 1852 /* not infinity */ 1853 flags |= RTF_EXPIRES; 1854 expires = jiffies_to_clock_t(rt_expires); 1855 } 1856 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1857 dev, expires, flags); 1858 } 1859 if (rt) 1860 dst_release(&rt->u.dst); 1861 } 1862 1863 /* Try to figure out our local address for this prefix */ 1864 1865 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1866 struct inet6_ifaddr * ifp; 1867 struct in6_addr addr; 1868 int create = 0, update_lft = 0; 1869 struct net *net = dev_net(dev); 1870 1871 if (pinfo->prefix_len == 64) { 1872 memcpy(&addr, &pinfo->prefix, 8); 1873 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1874 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1875 in6_dev_put(in6_dev); 1876 return; 1877 } 1878 goto ok; 1879 } 1880 if (net_ratelimit()) 1881 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1882 pinfo->prefix_len); 1883 in6_dev_put(in6_dev); 1884 return; 1885 1886 ok: 1887 1888 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1889 1890 if (ifp == NULL && valid_lft) { 1891 int max_addresses = in6_dev->cnf.max_addresses; 1892 u32 addr_flags = 0; 1893 1894 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1895 if (in6_dev->cnf.optimistic_dad && 1896 !net->ipv6.devconf_all->forwarding) 1897 addr_flags = IFA_F_OPTIMISTIC; 1898 #endif 1899 1900 /* Do not allow to create too much of autoconfigured 1901 * addresses; this would be too easy way to crash kernel. 1902 */ 1903 if (!max_addresses || 1904 ipv6_count_addresses(in6_dev) < max_addresses) 1905 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1906 addr_type&IPV6_ADDR_SCOPE_MASK, 1907 addr_flags); 1908 1909 if (!ifp || IS_ERR(ifp)) { 1910 in6_dev_put(in6_dev); 1911 return; 1912 } 1913 1914 update_lft = create = 1; 1915 ifp->cstamp = jiffies; 1916 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1917 } 1918 1919 if (ifp) { 1920 int flags; 1921 unsigned long now; 1922 #ifdef CONFIG_IPV6_PRIVACY 1923 struct inet6_ifaddr *ift; 1924 #endif 1925 u32 stored_lft; 1926 1927 /* update lifetime (RFC2462 5.5.3 e) */ 1928 spin_lock(&ifp->lock); 1929 now = jiffies; 1930 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1931 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1932 else 1933 stored_lft = 0; 1934 if (!update_lft && stored_lft) { 1935 if (valid_lft > MIN_VALID_LIFETIME || 1936 valid_lft > stored_lft) 1937 update_lft = 1; 1938 else if (stored_lft <= MIN_VALID_LIFETIME) { 1939 /* valid_lft <= stored_lft is always true */ 1940 /* XXX: IPsec */ 1941 update_lft = 0; 1942 } else { 1943 valid_lft = MIN_VALID_LIFETIME; 1944 if (valid_lft < prefered_lft) 1945 prefered_lft = valid_lft; 1946 update_lft = 1; 1947 } 1948 } 1949 1950 if (update_lft) { 1951 ifp->valid_lft = valid_lft; 1952 ifp->prefered_lft = prefered_lft; 1953 ifp->tstamp = now; 1954 flags = ifp->flags; 1955 ifp->flags &= ~IFA_F_DEPRECATED; 1956 spin_unlock(&ifp->lock); 1957 1958 if (!(flags&IFA_F_TENTATIVE)) 1959 ipv6_ifa_notify(0, ifp); 1960 } else 1961 spin_unlock(&ifp->lock); 1962 1963 #ifdef CONFIG_IPV6_PRIVACY 1964 read_lock_bh(&in6_dev->lock); 1965 /* update all temporary addresses in the list */ 1966 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1967 /* 1968 * When adjusting the lifetimes of an existing 1969 * temporary address, only lower the lifetimes. 1970 * Implementations must not increase the 1971 * lifetimes of an existing temporary address 1972 * when processing a Prefix Information Option. 1973 */ 1974 if (ifp != ift->ifpub) 1975 continue; 1976 1977 spin_lock(&ift->lock); 1978 flags = ift->flags; 1979 if (ift->valid_lft > valid_lft && 1980 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1981 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1982 if (ift->prefered_lft > prefered_lft && 1983 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1984 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1985 spin_unlock(&ift->lock); 1986 if (!(flags&IFA_F_TENTATIVE)) 1987 ipv6_ifa_notify(0, ift); 1988 } 1989 1990 if (create && in6_dev->cnf.use_tempaddr > 0) { 1991 /* 1992 * When a new public address is created as described in [ADDRCONF], 1993 * also create a new temporary address. 1994 */ 1995 read_unlock_bh(&in6_dev->lock); 1996 ipv6_create_tempaddr(ifp, NULL); 1997 } else { 1998 read_unlock_bh(&in6_dev->lock); 1999 } 2000 #endif 2001 in6_ifa_put(ifp); 2002 addrconf_verify(0); 2003 } 2004 } 2005 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2006 in6_dev_put(in6_dev); 2007 } 2008 2009 /* 2010 * Set destination address. 2011 * Special case for SIT interfaces where we create a new "virtual" 2012 * device. 2013 */ 2014 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2015 { 2016 struct in6_ifreq ireq; 2017 struct net_device *dev; 2018 int err = -EINVAL; 2019 2020 rtnl_lock(); 2021 2022 err = -EFAULT; 2023 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2024 goto err_exit; 2025 2026 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2027 2028 err = -ENODEV; 2029 if (dev == NULL) 2030 goto err_exit; 2031 2032 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2033 if (dev->type == ARPHRD_SIT) { 2034 const struct net_device_ops *ops = dev->netdev_ops; 2035 struct ifreq ifr; 2036 struct ip_tunnel_parm p; 2037 2038 err = -EADDRNOTAVAIL; 2039 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2040 goto err_exit; 2041 2042 memset(&p, 0, sizeof(p)); 2043 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2044 p.iph.saddr = 0; 2045 p.iph.version = 4; 2046 p.iph.ihl = 5; 2047 p.iph.protocol = IPPROTO_IPV6; 2048 p.iph.ttl = 64; 2049 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2050 2051 if (ops->ndo_do_ioctl) { 2052 mm_segment_t oldfs = get_fs(); 2053 2054 set_fs(KERNEL_DS); 2055 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2056 set_fs(oldfs); 2057 } else 2058 err = -EOPNOTSUPP; 2059 2060 if (err == 0) { 2061 err = -ENOBUFS; 2062 dev = __dev_get_by_name(net, p.name); 2063 if (!dev) 2064 goto err_exit; 2065 err = dev_open(dev); 2066 } 2067 } 2068 #endif 2069 2070 err_exit: 2071 rtnl_unlock(); 2072 return err; 2073 } 2074 2075 /* 2076 * Manual configuration of address on an interface 2077 */ 2078 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2079 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2080 __u32 valid_lft) 2081 { 2082 struct inet6_ifaddr *ifp; 2083 struct inet6_dev *idev; 2084 struct net_device *dev; 2085 int scope; 2086 u32 flags; 2087 clock_t expires; 2088 unsigned long timeout; 2089 2090 ASSERT_RTNL(); 2091 2092 if (plen > 128) 2093 return -EINVAL; 2094 2095 /* check the lifetime */ 2096 if (!valid_lft || prefered_lft > valid_lft) 2097 return -EINVAL; 2098 2099 dev = __dev_get_by_index(net, ifindex); 2100 if (!dev) 2101 return -ENODEV; 2102 2103 if ((idev = addrconf_add_dev(dev)) == NULL) 2104 return -ENOBUFS; 2105 2106 scope = ipv6_addr_scope(pfx); 2107 2108 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2109 if (addrconf_finite_timeout(timeout)) { 2110 expires = jiffies_to_clock_t(timeout * HZ); 2111 valid_lft = timeout; 2112 flags = RTF_EXPIRES; 2113 } else { 2114 expires = 0; 2115 flags = 0; 2116 ifa_flags |= IFA_F_PERMANENT; 2117 } 2118 2119 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2120 if (addrconf_finite_timeout(timeout)) { 2121 if (timeout == 0) 2122 ifa_flags |= IFA_F_DEPRECATED; 2123 prefered_lft = timeout; 2124 } 2125 2126 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2127 2128 if (!IS_ERR(ifp)) { 2129 spin_lock_bh(&ifp->lock); 2130 ifp->valid_lft = valid_lft; 2131 ifp->prefered_lft = prefered_lft; 2132 ifp->tstamp = jiffies; 2133 spin_unlock_bh(&ifp->lock); 2134 2135 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2136 expires, flags); 2137 /* 2138 * Note that section 3.1 of RFC 4429 indicates 2139 * that the Optimistic flag should not be set for 2140 * manually configured addresses 2141 */ 2142 addrconf_dad_start(ifp, 0); 2143 in6_ifa_put(ifp); 2144 addrconf_verify(0); 2145 return 0; 2146 } 2147 2148 return PTR_ERR(ifp); 2149 } 2150 2151 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2152 unsigned int plen) 2153 { 2154 struct inet6_ifaddr *ifp; 2155 struct inet6_dev *idev; 2156 struct net_device *dev; 2157 2158 if (plen > 128) 2159 return -EINVAL; 2160 2161 dev = __dev_get_by_index(net, ifindex); 2162 if (!dev) 2163 return -ENODEV; 2164 2165 if ((idev = __in6_dev_get(dev)) == NULL) 2166 return -ENXIO; 2167 2168 read_lock_bh(&idev->lock); 2169 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2170 if (ifp->prefix_len == plen && 2171 ipv6_addr_equal(pfx, &ifp->addr)) { 2172 in6_ifa_hold(ifp); 2173 read_unlock_bh(&idev->lock); 2174 2175 ipv6_del_addr(ifp); 2176 2177 /* If the last address is deleted administratively, 2178 disable IPv6 on this interface. 2179 */ 2180 if (idev->addr_list == NULL) 2181 addrconf_ifdown(idev->dev, 1); 2182 return 0; 2183 } 2184 } 2185 read_unlock_bh(&idev->lock); 2186 return -EADDRNOTAVAIL; 2187 } 2188 2189 2190 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2191 { 2192 struct in6_ifreq ireq; 2193 int err; 2194 2195 if (!capable(CAP_NET_ADMIN)) 2196 return -EPERM; 2197 2198 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2199 return -EFAULT; 2200 2201 rtnl_lock(); 2202 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2203 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2204 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2205 rtnl_unlock(); 2206 return err; 2207 } 2208 2209 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2210 { 2211 struct in6_ifreq ireq; 2212 int err; 2213 2214 if (!capable(CAP_NET_ADMIN)) 2215 return -EPERM; 2216 2217 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2218 return -EFAULT; 2219 2220 rtnl_lock(); 2221 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2222 ireq.ifr6_prefixlen); 2223 rtnl_unlock(); 2224 return err; 2225 } 2226 2227 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2228 int plen, int scope) 2229 { 2230 struct inet6_ifaddr *ifp; 2231 2232 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2233 if (!IS_ERR(ifp)) { 2234 spin_lock_bh(&ifp->lock); 2235 ifp->flags &= ~IFA_F_TENTATIVE; 2236 spin_unlock_bh(&ifp->lock); 2237 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2238 in6_ifa_put(ifp); 2239 } 2240 } 2241 2242 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2243 static void sit_add_v4_addrs(struct inet6_dev *idev) 2244 { 2245 struct in6_addr addr; 2246 struct net_device *dev; 2247 struct net *net = dev_net(idev->dev); 2248 int scope; 2249 2250 ASSERT_RTNL(); 2251 2252 memset(&addr, 0, sizeof(struct in6_addr)); 2253 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2254 2255 if (idev->dev->flags&IFF_POINTOPOINT) { 2256 addr.s6_addr32[0] = htonl(0xfe800000); 2257 scope = IFA_LINK; 2258 } else { 2259 scope = IPV6_ADDR_COMPATv4; 2260 } 2261 2262 if (addr.s6_addr32[3]) { 2263 add_addr(idev, &addr, 128, scope); 2264 return; 2265 } 2266 2267 for_each_netdev(net, dev) { 2268 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2269 if (in_dev && (dev->flags & IFF_UP)) { 2270 struct in_ifaddr * ifa; 2271 2272 int flag = scope; 2273 2274 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2275 int plen; 2276 2277 addr.s6_addr32[3] = ifa->ifa_local; 2278 2279 if (ifa->ifa_scope == RT_SCOPE_LINK) 2280 continue; 2281 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2282 if (idev->dev->flags&IFF_POINTOPOINT) 2283 continue; 2284 flag |= IFA_HOST; 2285 } 2286 if (idev->dev->flags&IFF_POINTOPOINT) 2287 plen = 64; 2288 else 2289 plen = 96; 2290 2291 add_addr(idev, &addr, plen, flag); 2292 } 2293 } 2294 } 2295 } 2296 #endif 2297 2298 static void init_loopback(struct net_device *dev) 2299 { 2300 struct inet6_dev *idev; 2301 2302 /* ::1 */ 2303 2304 ASSERT_RTNL(); 2305 2306 if ((idev = ipv6_find_idev(dev)) == NULL) { 2307 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2308 return; 2309 } 2310 2311 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2312 } 2313 2314 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2315 { 2316 struct inet6_ifaddr * ifp; 2317 u32 addr_flags = IFA_F_PERMANENT; 2318 2319 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2320 if (idev->cnf.optimistic_dad && 2321 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2322 addr_flags |= IFA_F_OPTIMISTIC; 2323 #endif 2324 2325 2326 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2327 if (!IS_ERR(ifp)) { 2328 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2329 addrconf_dad_start(ifp, 0); 2330 in6_ifa_put(ifp); 2331 } 2332 } 2333 2334 static void addrconf_dev_config(struct net_device *dev) 2335 { 2336 struct in6_addr addr; 2337 struct inet6_dev * idev; 2338 2339 ASSERT_RTNL(); 2340 2341 if ((dev->type != ARPHRD_ETHER) && 2342 (dev->type != ARPHRD_FDDI) && 2343 (dev->type != ARPHRD_IEEE802_TR) && 2344 (dev->type != ARPHRD_ARCNET) && 2345 (dev->type != ARPHRD_INFINIBAND)) { 2346 /* Alas, we support only Ethernet autoconfiguration. */ 2347 return; 2348 } 2349 2350 idev = addrconf_add_dev(dev); 2351 if (idev == NULL) 2352 return; 2353 2354 memset(&addr, 0, sizeof(struct in6_addr)); 2355 addr.s6_addr32[0] = htonl(0xFE800000); 2356 2357 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2358 addrconf_add_linklocal(idev, &addr); 2359 } 2360 2361 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2362 static void addrconf_sit_config(struct net_device *dev) 2363 { 2364 struct inet6_dev *idev; 2365 2366 ASSERT_RTNL(); 2367 2368 /* 2369 * Configure the tunnel with one of our IPv4 2370 * addresses... we should configure all of 2371 * our v4 addrs in the tunnel 2372 */ 2373 2374 if ((idev = ipv6_find_idev(dev)) == NULL) { 2375 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2376 return; 2377 } 2378 2379 if (dev->priv_flags & IFF_ISATAP) { 2380 struct in6_addr addr; 2381 2382 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2383 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2384 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2385 addrconf_add_linklocal(idev, &addr); 2386 return; 2387 } 2388 2389 sit_add_v4_addrs(idev); 2390 2391 if (dev->flags&IFF_POINTOPOINT) { 2392 addrconf_add_mroute(dev); 2393 addrconf_add_lroute(dev); 2394 } else 2395 sit_route_add(dev); 2396 } 2397 #endif 2398 2399 static inline int 2400 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2401 { 2402 struct in6_addr lladdr; 2403 2404 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2405 addrconf_add_linklocal(idev, &lladdr); 2406 return 0; 2407 } 2408 return -1; 2409 } 2410 2411 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2412 { 2413 struct net_device *link_dev; 2414 struct net *net = dev_net(idev->dev); 2415 2416 /* first try to inherit the link-local address from the link device */ 2417 if (idev->dev->iflink && 2418 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2419 if (!ipv6_inherit_linklocal(idev, link_dev)) 2420 return; 2421 } 2422 /* then try to inherit it from any device */ 2423 for_each_netdev(net, link_dev) { 2424 if (!ipv6_inherit_linklocal(idev, link_dev)) 2425 return; 2426 } 2427 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2428 } 2429 2430 /* 2431 * Autoconfigure tunnel with a link-local address so routing protocols, 2432 * DHCPv6, MLD etc. can be run over the virtual link 2433 */ 2434 2435 static void addrconf_ip6_tnl_config(struct net_device *dev) 2436 { 2437 struct inet6_dev *idev; 2438 2439 ASSERT_RTNL(); 2440 2441 if ((idev = addrconf_add_dev(dev)) == NULL) { 2442 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2443 return; 2444 } 2445 ip6_tnl_add_linklocal(idev); 2446 } 2447 2448 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2449 void * data) 2450 { 2451 struct net_device *dev = (struct net_device *) data; 2452 struct inet6_dev *idev = __in6_dev_get(dev); 2453 int run_pending = 0; 2454 int err; 2455 2456 switch(event) { 2457 case NETDEV_REGISTER: 2458 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2459 idev = ipv6_add_dev(dev); 2460 if (!idev) 2461 return notifier_from_errno(-ENOMEM); 2462 } 2463 break; 2464 case NETDEV_UP: 2465 case NETDEV_CHANGE: 2466 if (dev->flags & IFF_SLAVE) 2467 break; 2468 2469 if (event == NETDEV_UP) { 2470 if (!addrconf_qdisc_ok(dev)) { 2471 /* device is not ready yet. */ 2472 printk(KERN_INFO 2473 "ADDRCONF(NETDEV_UP): %s: " 2474 "link is not ready\n", 2475 dev->name); 2476 break; 2477 } 2478 2479 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2480 idev = ipv6_add_dev(dev); 2481 2482 if (idev) { 2483 idev->if_flags |= IF_READY; 2484 run_pending = 1; 2485 } 2486 } else { 2487 if (!addrconf_qdisc_ok(dev)) { 2488 /* device is still not ready. */ 2489 break; 2490 } 2491 2492 if (idev) { 2493 if (idev->if_flags & IF_READY) { 2494 /* device is already configured. */ 2495 break; 2496 } 2497 idev->if_flags |= IF_READY; 2498 } 2499 2500 printk(KERN_INFO 2501 "ADDRCONF(NETDEV_CHANGE): %s: " 2502 "link becomes ready\n", 2503 dev->name); 2504 2505 run_pending = 1; 2506 } 2507 2508 switch(dev->type) { 2509 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2510 case ARPHRD_SIT: 2511 addrconf_sit_config(dev); 2512 break; 2513 #endif 2514 case ARPHRD_TUNNEL6: 2515 addrconf_ip6_tnl_config(dev); 2516 break; 2517 case ARPHRD_LOOPBACK: 2518 init_loopback(dev); 2519 break; 2520 2521 default: 2522 addrconf_dev_config(dev); 2523 break; 2524 } 2525 if (idev) { 2526 if (run_pending) 2527 addrconf_dad_run(idev); 2528 2529 /* If the MTU changed during the interface down, when the 2530 interface up, the changed MTU must be reflected in the 2531 idev as well as routers. 2532 */ 2533 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2534 rt6_mtu_change(dev, dev->mtu); 2535 idev->cnf.mtu6 = dev->mtu; 2536 } 2537 idev->tstamp = jiffies; 2538 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2539 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2540 stop IPv6 on this interface. 2541 */ 2542 if (dev->mtu < IPV6_MIN_MTU) 2543 addrconf_ifdown(dev, event != NETDEV_DOWN); 2544 } 2545 break; 2546 2547 case NETDEV_CHANGEMTU: 2548 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2549 rt6_mtu_change(dev, dev->mtu); 2550 idev->cnf.mtu6 = dev->mtu; 2551 break; 2552 } 2553 2554 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2555 idev = ipv6_add_dev(dev); 2556 if (idev) 2557 break; 2558 } 2559 2560 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2561 2562 case NETDEV_DOWN: 2563 case NETDEV_UNREGISTER: 2564 /* 2565 * Remove all addresses from this interface. 2566 */ 2567 addrconf_ifdown(dev, event != NETDEV_DOWN); 2568 break; 2569 2570 case NETDEV_CHANGENAME: 2571 if (idev) { 2572 snmp6_unregister_dev(idev); 2573 addrconf_sysctl_unregister(idev); 2574 addrconf_sysctl_register(idev); 2575 err = snmp6_register_dev(idev); 2576 if (err) 2577 return notifier_from_errno(err); 2578 } 2579 break; 2580 } 2581 2582 return NOTIFY_OK; 2583 } 2584 2585 /* 2586 * addrconf module should be notified of a device going up 2587 */ 2588 static struct notifier_block ipv6_dev_notf = { 2589 .notifier_call = addrconf_notify, 2590 .priority = 0 2591 }; 2592 2593 static int addrconf_ifdown(struct net_device *dev, int how) 2594 { 2595 struct inet6_dev *idev; 2596 struct inet6_ifaddr *ifa, **bifa; 2597 struct net *net = dev_net(dev); 2598 int i; 2599 2600 ASSERT_RTNL(); 2601 2602 if ((dev->flags & IFF_LOOPBACK) && how == 1) 2603 how = 0; 2604 2605 rt6_ifdown(net, dev); 2606 neigh_ifdown(&nd_tbl, dev); 2607 2608 idev = __in6_dev_get(dev); 2609 if (idev == NULL) 2610 return -ENODEV; 2611 2612 /* Step 1: remove reference to ipv6 device from parent device. 2613 Do not dev_put! 2614 */ 2615 if (how) { 2616 idev->dead = 1; 2617 2618 /* protected by rtnl_lock */ 2619 rcu_assign_pointer(dev->ip6_ptr, NULL); 2620 2621 /* Step 1.5: remove snmp6 entry */ 2622 snmp6_unregister_dev(idev); 2623 2624 } 2625 2626 /* Step 2: clear hash table */ 2627 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2628 bifa = &inet6_addr_lst[i]; 2629 2630 write_lock_bh(&addrconf_hash_lock); 2631 while ((ifa = *bifa) != NULL) { 2632 if (ifa->idev == idev) { 2633 *bifa = ifa->lst_next; 2634 ifa->lst_next = NULL; 2635 addrconf_del_timer(ifa); 2636 in6_ifa_put(ifa); 2637 continue; 2638 } 2639 bifa = &ifa->lst_next; 2640 } 2641 write_unlock_bh(&addrconf_hash_lock); 2642 } 2643 2644 write_lock_bh(&idev->lock); 2645 2646 /* Step 3: clear flags for stateless addrconf */ 2647 if (!how) 2648 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2649 2650 /* Step 4: clear address list */ 2651 #ifdef CONFIG_IPV6_PRIVACY 2652 if (how && del_timer(&idev->regen_timer)) 2653 in6_dev_put(idev); 2654 2655 /* clear tempaddr list */ 2656 while ((ifa = idev->tempaddr_list) != NULL) { 2657 idev->tempaddr_list = ifa->tmp_next; 2658 ifa->tmp_next = NULL; 2659 ifa->dead = 1; 2660 write_unlock_bh(&idev->lock); 2661 spin_lock_bh(&ifa->lock); 2662 2663 if (ifa->ifpub) { 2664 in6_ifa_put(ifa->ifpub); 2665 ifa->ifpub = NULL; 2666 } 2667 spin_unlock_bh(&ifa->lock); 2668 in6_ifa_put(ifa); 2669 write_lock_bh(&idev->lock); 2670 } 2671 #endif 2672 while ((ifa = idev->addr_list) != NULL) { 2673 idev->addr_list = ifa->if_next; 2674 ifa->if_next = NULL; 2675 ifa->dead = 1; 2676 addrconf_del_timer(ifa); 2677 write_unlock_bh(&idev->lock); 2678 2679 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2680 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2681 in6_ifa_put(ifa); 2682 2683 write_lock_bh(&idev->lock); 2684 } 2685 write_unlock_bh(&idev->lock); 2686 2687 /* Step 5: Discard multicast list */ 2688 2689 if (how) 2690 ipv6_mc_destroy_dev(idev); 2691 else 2692 ipv6_mc_down(idev); 2693 2694 idev->tstamp = jiffies; 2695 2696 /* Shot the device (if unregistered) */ 2697 2698 if (how) { 2699 addrconf_sysctl_unregister(idev); 2700 neigh_parms_release(&nd_tbl, idev->nd_parms); 2701 neigh_ifdown(&nd_tbl, dev); 2702 in6_dev_put(idev); 2703 } 2704 return 0; 2705 } 2706 2707 static void addrconf_rs_timer(unsigned long data) 2708 { 2709 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2710 2711 if (ifp->idev->cnf.forwarding) 2712 goto out; 2713 2714 if (ifp->idev->if_flags & IF_RA_RCVD) { 2715 /* 2716 * Announcement received after solicitation 2717 * was sent 2718 */ 2719 goto out; 2720 } 2721 2722 spin_lock(&ifp->lock); 2723 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2724 /* The wait after the last probe can be shorter */ 2725 addrconf_mod_timer(ifp, AC_RS, 2726 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2727 ifp->idev->cnf.rtr_solicit_delay : 2728 ifp->idev->cnf.rtr_solicit_interval); 2729 spin_unlock(&ifp->lock); 2730 2731 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2732 } else { 2733 spin_unlock(&ifp->lock); 2734 /* 2735 * Note: we do not support deprecated "all on-link" 2736 * assumption any longer. 2737 */ 2738 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2739 ifp->idev->dev->name); 2740 } 2741 2742 out: 2743 in6_ifa_put(ifp); 2744 } 2745 2746 /* 2747 * Duplicate Address Detection 2748 */ 2749 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2750 { 2751 unsigned long rand_num; 2752 struct inet6_dev *idev = ifp->idev; 2753 2754 if (ifp->flags & IFA_F_OPTIMISTIC) 2755 rand_num = 0; 2756 else 2757 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2758 2759 ifp->probes = idev->cnf.dad_transmits; 2760 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2761 } 2762 2763 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2764 { 2765 struct inet6_dev *idev = ifp->idev; 2766 struct net_device *dev = idev->dev; 2767 2768 addrconf_join_solict(dev, &ifp->addr); 2769 2770 net_srandom(ifp->addr.s6_addr32[3]); 2771 2772 read_lock_bh(&idev->lock); 2773 if (ifp->dead) 2774 goto out; 2775 spin_lock_bh(&ifp->lock); 2776 2777 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2778 idev->cnf.accept_dad < 1 || 2779 !(ifp->flags&IFA_F_TENTATIVE) || 2780 ifp->flags & IFA_F_NODAD) { 2781 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2782 spin_unlock_bh(&ifp->lock); 2783 read_unlock_bh(&idev->lock); 2784 2785 addrconf_dad_completed(ifp); 2786 return; 2787 } 2788 2789 if (!(idev->if_flags & IF_READY)) { 2790 spin_unlock_bh(&ifp->lock); 2791 read_unlock_bh(&idev->lock); 2792 /* 2793 * If the defice is not ready: 2794 * - keep it tentative if it is a permanent address. 2795 * - otherwise, kill it. 2796 */ 2797 in6_ifa_hold(ifp); 2798 addrconf_dad_stop(ifp); 2799 return; 2800 } 2801 2802 /* 2803 * Optimistic nodes can start receiving 2804 * Frames right away 2805 */ 2806 if(ifp->flags & IFA_F_OPTIMISTIC) 2807 ip6_ins_rt(ifp->rt); 2808 2809 addrconf_dad_kick(ifp); 2810 spin_unlock_bh(&ifp->lock); 2811 out: 2812 read_unlock_bh(&idev->lock); 2813 } 2814 2815 static void addrconf_dad_timer(unsigned long data) 2816 { 2817 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2818 struct inet6_dev *idev = ifp->idev; 2819 struct in6_addr mcaddr; 2820 2821 read_lock_bh(&idev->lock); 2822 if (idev->dead) { 2823 read_unlock_bh(&idev->lock); 2824 goto out; 2825 } 2826 if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) { 2827 read_unlock_bh(&idev->lock); 2828 addrconf_dad_failure(ifp); 2829 return; 2830 } 2831 spin_lock_bh(&ifp->lock); 2832 if (ifp->probes == 0) { 2833 /* 2834 * DAD was successful 2835 */ 2836 2837 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2838 spin_unlock_bh(&ifp->lock); 2839 read_unlock_bh(&idev->lock); 2840 2841 addrconf_dad_completed(ifp); 2842 2843 goto out; 2844 } 2845 2846 ifp->probes--; 2847 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2848 spin_unlock_bh(&ifp->lock); 2849 read_unlock_bh(&idev->lock); 2850 2851 /* send a neighbour solicitation for our addr */ 2852 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2853 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2854 out: 2855 in6_ifa_put(ifp); 2856 } 2857 2858 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2859 { 2860 struct net_device * dev = ifp->idev->dev; 2861 2862 /* 2863 * Configure the address for reception. Now it is valid. 2864 */ 2865 2866 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2867 2868 /* If added prefix is link local and forwarding is off, 2869 start sending router solicitations. 2870 */ 2871 2872 if (ifp->idev->cnf.forwarding == 0 && 2873 ifp->idev->cnf.rtr_solicits > 0 && 2874 (dev->flags&IFF_LOOPBACK) == 0 && 2875 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2876 /* 2877 * If a host as already performed a random delay 2878 * [...] as part of DAD [...] there is no need 2879 * to delay again before sending the first RS 2880 */ 2881 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2882 2883 spin_lock_bh(&ifp->lock); 2884 ifp->probes = 1; 2885 ifp->idev->if_flags |= IF_RS_SENT; 2886 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2887 spin_unlock_bh(&ifp->lock); 2888 } 2889 } 2890 2891 static void addrconf_dad_run(struct inet6_dev *idev) { 2892 struct inet6_ifaddr *ifp; 2893 2894 read_lock_bh(&idev->lock); 2895 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2896 spin_lock_bh(&ifp->lock); 2897 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2898 spin_unlock_bh(&ifp->lock); 2899 continue; 2900 } 2901 spin_unlock_bh(&ifp->lock); 2902 addrconf_dad_kick(ifp); 2903 } 2904 read_unlock_bh(&idev->lock); 2905 } 2906 2907 #ifdef CONFIG_PROC_FS 2908 struct if6_iter_state { 2909 struct seq_net_private p; 2910 int bucket; 2911 }; 2912 2913 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2914 { 2915 struct inet6_ifaddr *ifa = NULL; 2916 struct if6_iter_state *state = seq->private; 2917 struct net *net = seq_file_net(seq); 2918 2919 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2920 ifa = inet6_addr_lst[state->bucket]; 2921 2922 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2923 ifa = ifa->lst_next; 2924 if (ifa) 2925 break; 2926 } 2927 return ifa; 2928 } 2929 2930 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2931 { 2932 struct if6_iter_state *state = seq->private; 2933 struct net *net = seq_file_net(seq); 2934 2935 ifa = ifa->lst_next; 2936 try_again: 2937 if (ifa) { 2938 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2939 ifa = ifa->lst_next; 2940 goto try_again; 2941 } 2942 } 2943 2944 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2945 ifa = inet6_addr_lst[state->bucket]; 2946 goto try_again; 2947 } 2948 2949 return ifa; 2950 } 2951 2952 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2953 { 2954 struct inet6_ifaddr *ifa = if6_get_first(seq); 2955 2956 if (ifa) 2957 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2958 --pos; 2959 return pos ? NULL : ifa; 2960 } 2961 2962 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2963 __acquires(addrconf_hash_lock) 2964 { 2965 read_lock_bh(&addrconf_hash_lock); 2966 return if6_get_idx(seq, *pos); 2967 } 2968 2969 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2970 { 2971 struct inet6_ifaddr *ifa; 2972 2973 ifa = if6_get_next(seq, v); 2974 ++*pos; 2975 return ifa; 2976 } 2977 2978 static void if6_seq_stop(struct seq_file *seq, void *v) 2979 __releases(addrconf_hash_lock) 2980 { 2981 read_unlock_bh(&addrconf_hash_lock); 2982 } 2983 2984 static int if6_seq_show(struct seq_file *seq, void *v) 2985 { 2986 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2987 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 2988 &ifp->addr, 2989 ifp->idev->dev->ifindex, 2990 ifp->prefix_len, 2991 ifp->scope, 2992 ifp->flags, 2993 ifp->idev->dev->name); 2994 return 0; 2995 } 2996 2997 static const struct seq_operations if6_seq_ops = { 2998 .start = if6_seq_start, 2999 .next = if6_seq_next, 3000 .show = if6_seq_show, 3001 .stop = if6_seq_stop, 3002 }; 3003 3004 static int if6_seq_open(struct inode *inode, struct file *file) 3005 { 3006 return seq_open_net(inode, file, &if6_seq_ops, 3007 sizeof(struct if6_iter_state)); 3008 } 3009 3010 static const struct file_operations if6_fops = { 3011 .owner = THIS_MODULE, 3012 .open = if6_seq_open, 3013 .read = seq_read, 3014 .llseek = seq_lseek, 3015 .release = seq_release_net, 3016 }; 3017 3018 static int if6_proc_net_init(struct net *net) 3019 { 3020 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3021 return -ENOMEM; 3022 return 0; 3023 } 3024 3025 static void if6_proc_net_exit(struct net *net) 3026 { 3027 proc_net_remove(net, "if_inet6"); 3028 } 3029 3030 static struct pernet_operations if6_proc_net_ops = { 3031 .init = if6_proc_net_init, 3032 .exit = if6_proc_net_exit, 3033 }; 3034 3035 int __init if6_proc_init(void) 3036 { 3037 return register_pernet_subsys(&if6_proc_net_ops); 3038 } 3039 3040 void if6_proc_exit(void) 3041 { 3042 unregister_pernet_subsys(&if6_proc_net_ops); 3043 } 3044 #endif /* CONFIG_PROC_FS */ 3045 3046 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3047 /* Check if address is a home address configured on any interface. */ 3048 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3049 { 3050 int ret = 0; 3051 struct inet6_ifaddr * ifp; 3052 u8 hash = ipv6_addr_hash(addr); 3053 read_lock_bh(&addrconf_hash_lock); 3054 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 3055 if (!net_eq(dev_net(ifp->idev->dev), net)) 3056 continue; 3057 if (ipv6_addr_equal(&ifp->addr, addr) && 3058 (ifp->flags & IFA_F_HOMEADDRESS)) { 3059 ret = 1; 3060 break; 3061 } 3062 } 3063 read_unlock_bh(&addrconf_hash_lock); 3064 return ret; 3065 } 3066 #endif 3067 3068 /* 3069 * Periodic address status verification 3070 */ 3071 3072 static void addrconf_verify(unsigned long foo) 3073 { 3074 struct inet6_ifaddr *ifp; 3075 unsigned long now, next; 3076 int i; 3077 3078 spin_lock_bh(&addrconf_verify_lock); 3079 now = jiffies; 3080 next = now + ADDR_CHECK_FREQUENCY; 3081 3082 del_timer(&addr_chk_timer); 3083 3084 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3085 3086 restart: 3087 read_lock(&addrconf_hash_lock); 3088 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 3089 unsigned long age; 3090 #ifdef CONFIG_IPV6_PRIVACY 3091 unsigned long regen_advance; 3092 #endif 3093 3094 if (ifp->flags & IFA_F_PERMANENT) 3095 continue; 3096 3097 spin_lock(&ifp->lock); 3098 age = (now - ifp->tstamp) / HZ; 3099 3100 #ifdef CONFIG_IPV6_PRIVACY 3101 regen_advance = ifp->idev->cnf.regen_max_retry * 3102 ifp->idev->cnf.dad_transmits * 3103 ifp->idev->nd_parms->retrans_time / HZ; 3104 #endif 3105 3106 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3107 age >= ifp->valid_lft) { 3108 spin_unlock(&ifp->lock); 3109 in6_ifa_hold(ifp); 3110 read_unlock(&addrconf_hash_lock); 3111 ipv6_del_addr(ifp); 3112 goto restart; 3113 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3114 spin_unlock(&ifp->lock); 3115 continue; 3116 } else if (age >= ifp->prefered_lft) { 3117 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 3118 int deprecate = 0; 3119 3120 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3121 deprecate = 1; 3122 ifp->flags |= IFA_F_DEPRECATED; 3123 } 3124 3125 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3126 next = ifp->tstamp + ifp->valid_lft * HZ; 3127 3128 spin_unlock(&ifp->lock); 3129 3130 if (deprecate) { 3131 in6_ifa_hold(ifp); 3132 read_unlock(&addrconf_hash_lock); 3133 3134 ipv6_ifa_notify(0, ifp); 3135 in6_ifa_put(ifp); 3136 goto restart; 3137 } 3138 #ifdef CONFIG_IPV6_PRIVACY 3139 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3140 !(ifp->flags&IFA_F_TENTATIVE)) { 3141 if (age >= ifp->prefered_lft - regen_advance) { 3142 struct inet6_ifaddr *ifpub = ifp->ifpub; 3143 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3144 next = ifp->tstamp + ifp->prefered_lft * HZ; 3145 if (!ifp->regen_count && ifpub) { 3146 ifp->regen_count++; 3147 in6_ifa_hold(ifp); 3148 in6_ifa_hold(ifpub); 3149 spin_unlock(&ifp->lock); 3150 read_unlock(&addrconf_hash_lock); 3151 spin_lock(&ifpub->lock); 3152 ifpub->regen_count = 0; 3153 spin_unlock(&ifpub->lock); 3154 ipv6_create_tempaddr(ifpub, ifp); 3155 in6_ifa_put(ifpub); 3156 in6_ifa_put(ifp); 3157 goto restart; 3158 } 3159 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3160 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3161 spin_unlock(&ifp->lock); 3162 #endif 3163 } else { 3164 /* ifp->prefered_lft <= ifp->valid_lft */ 3165 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3166 next = ifp->tstamp + ifp->prefered_lft * HZ; 3167 spin_unlock(&ifp->lock); 3168 } 3169 } 3170 read_unlock(&addrconf_hash_lock); 3171 } 3172 3173 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3174 add_timer(&addr_chk_timer); 3175 spin_unlock_bh(&addrconf_verify_lock); 3176 } 3177 3178 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3179 { 3180 struct in6_addr *pfx = NULL; 3181 3182 if (addr) 3183 pfx = nla_data(addr); 3184 3185 if (local) { 3186 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3187 pfx = NULL; 3188 else 3189 pfx = nla_data(local); 3190 } 3191 3192 return pfx; 3193 } 3194 3195 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3196 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3197 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3198 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3199 }; 3200 3201 static int 3202 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3203 { 3204 struct net *net = sock_net(skb->sk); 3205 struct ifaddrmsg *ifm; 3206 struct nlattr *tb[IFA_MAX+1]; 3207 struct in6_addr *pfx; 3208 int err; 3209 3210 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3211 if (err < 0) 3212 return err; 3213 3214 ifm = nlmsg_data(nlh); 3215 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3216 if (pfx == NULL) 3217 return -EINVAL; 3218 3219 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3220 } 3221 3222 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3223 u32 prefered_lft, u32 valid_lft) 3224 { 3225 u32 flags; 3226 clock_t expires; 3227 unsigned long timeout; 3228 3229 if (!valid_lft || (prefered_lft > valid_lft)) 3230 return -EINVAL; 3231 3232 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3233 if (addrconf_finite_timeout(timeout)) { 3234 expires = jiffies_to_clock_t(timeout * HZ); 3235 valid_lft = timeout; 3236 flags = RTF_EXPIRES; 3237 } else { 3238 expires = 0; 3239 flags = 0; 3240 ifa_flags |= IFA_F_PERMANENT; 3241 } 3242 3243 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3244 if (addrconf_finite_timeout(timeout)) { 3245 if (timeout == 0) 3246 ifa_flags |= IFA_F_DEPRECATED; 3247 prefered_lft = timeout; 3248 } 3249 3250 spin_lock_bh(&ifp->lock); 3251 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3252 ifp->tstamp = jiffies; 3253 ifp->valid_lft = valid_lft; 3254 ifp->prefered_lft = prefered_lft; 3255 3256 spin_unlock_bh(&ifp->lock); 3257 if (!(ifp->flags&IFA_F_TENTATIVE)) 3258 ipv6_ifa_notify(0, ifp); 3259 3260 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3261 expires, flags); 3262 addrconf_verify(0); 3263 3264 return 0; 3265 } 3266 3267 static int 3268 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3269 { 3270 struct net *net = sock_net(skb->sk); 3271 struct ifaddrmsg *ifm; 3272 struct nlattr *tb[IFA_MAX+1]; 3273 struct in6_addr *pfx; 3274 struct inet6_ifaddr *ifa; 3275 struct net_device *dev; 3276 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3277 u8 ifa_flags; 3278 int err; 3279 3280 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3281 if (err < 0) 3282 return err; 3283 3284 ifm = nlmsg_data(nlh); 3285 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3286 if (pfx == NULL) 3287 return -EINVAL; 3288 3289 if (tb[IFA_CACHEINFO]) { 3290 struct ifa_cacheinfo *ci; 3291 3292 ci = nla_data(tb[IFA_CACHEINFO]); 3293 valid_lft = ci->ifa_valid; 3294 preferred_lft = ci->ifa_prefered; 3295 } else { 3296 preferred_lft = INFINITY_LIFE_TIME; 3297 valid_lft = INFINITY_LIFE_TIME; 3298 } 3299 3300 dev = __dev_get_by_index(net, ifm->ifa_index); 3301 if (dev == NULL) 3302 return -ENODEV; 3303 3304 /* We ignore other flags so far. */ 3305 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3306 3307 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3308 if (ifa == NULL) { 3309 /* 3310 * It would be best to check for !NLM_F_CREATE here but 3311 * userspace alreay relies on not having to provide this. 3312 */ 3313 return inet6_addr_add(net, ifm->ifa_index, pfx, 3314 ifm->ifa_prefixlen, ifa_flags, 3315 preferred_lft, valid_lft); 3316 } 3317 3318 if (nlh->nlmsg_flags & NLM_F_EXCL || 3319 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3320 err = -EEXIST; 3321 else 3322 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3323 3324 in6_ifa_put(ifa); 3325 3326 return err; 3327 } 3328 3329 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3330 u8 scope, int ifindex) 3331 { 3332 struct ifaddrmsg *ifm; 3333 3334 ifm = nlmsg_data(nlh); 3335 ifm->ifa_family = AF_INET6; 3336 ifm->ifa_prefixlen = prefixlen; 3337 ifm->ifa_flags = flags; 3338 ifm->ifa_scope = scope; 3339 ifm->ifa_index = ifindex; 3340 } 3341 3342 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3343 unsigned long tstamp, u32 preferred, u32 valid) 3344 { 3345 struct ifa_cacheinfo ci; 3346 3347 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3348 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3349 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3350 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3351 ci.ifa_prefered = preferred; 3352 ci.ifa_valid = valid; 3353 3354 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3355 } 3356 3357 static inline int rt_scope(int ifa_scope) 3358 { 3359 if (ifa_scope & IFA_HOST) 3360 return RT_SCOPE_HOST; 3361 else if (ifa_scope & IFA_LINK) 3362 return RT_SCOPE_LINK; 3363 else if (ifa_scope & IFA_SITE) 3364 return RT_SCOPE_SITE; 3365 else 3366 return RT_SCOPE_UNIVERSE; 3367 } 3368 3369 static inline int inet6_ifaddr_msgsize(void) 3370 { 3371 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3372 + nla_total_size(16) /* IFA_ADDRESS */ 3373 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3374 } 3375 3376 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3377 u32 pid, u32 seq, int event, unsigned int flags) 3378 { 3379 struct nlmsghdr *nlh; 3380 u32 preferred, valid; 3381 3382 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3383 if (nlh == NULL) 3384 return -EMSGSIZE; 3385 3386 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3387 ifa->idev->dev->ifindex); 3388 3389 if (!(ifa->flags&IFA_F_PERMANENT)) { 3390 preferred = ifa->prefered_lft; 3391 valid = ifa->valid_lft; 3392 if (preferred != INFINITY_LIFE_TIME) { 3393 long tval = (jiffies - ifa->tstamp)/HZ; 3394 preferred -= tval; 3395 if (valid != INFINITY_LIFE_TIME) 3396 valid -= tval; 3397 } 3398 } else { 3399 preferred = INFINITY_LIFE_TIME; 3400 valid = INFINITY_LIFE_TIME; 3401 } 3402 3403 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3404 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3405 nlmsg_cancel(skb, nlh); 3406 return -EMSGSIZE; 3407 } 3408 3409 return nlmsg_end(skb, nlh); 3410 } 3411 3412 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3413 u32 pid, u32 seq, int event, u16 flags) 3414 { 3415 struct nlmsghdr *nlh; 3416 u8 scope = RT_SCOPE_UNIVERSE; 3417 int ifindex = ifmca->idev->dev->ifindex; 3418 3419 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3420 scope = RT_SCOPE_SITE; 3421 3422 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3423 if (nlh == NULL) 3424 return -EMSGSIZE; 3425 3426 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3427 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3428 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3429 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3430 nlmsg_cancel(skb, nlh); 3431 return -EMSGSIZE; 3432 } 3433 3434 return nlmsg_end(skb, nlh); 3435 } 3436 3437 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3438 u32 pid, u32 seq, int event, unsigned int flags) 3439 { 3440 struct nlmsghdr *nlh; 3441 u8 scope = RT_SCOPE_UNIVERSE; 3442 int ifindex = ifaca->aca_idev->dev->ifindex; 3443 3444 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3445 scope = RT_SCOPE_SITE; 3446 3447 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3448 if (nlh == NULL) 3449 return -EMSGSIZE; 3450 3451 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3452 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3453 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3454 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3455 nlmsg_cancel(skb, nlh); 3456 return -EMSGSIZE; 3457 } 3458 3459 return nlmsg_end(skb, nlh); 3460 } 3461 3462 enum addr_type_t 3463 { 3464 UNICAST_ADDR, 3465 MULTICAST_ADDR, 3466 ANYCAST_ADDR, 3467 }; 3468 3469 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3470 enum addr_type_t type) 3471 { 3472 int idx, ip_idx; 3473 int s_idx, s_ip_idx; 3474 int err = 1; 3475 struct net_device *dev; 3476 struct inet6_dev *idev = NULL; 3477 struct inet6_ifaddr *ifa; 3478 struct ifmcaddr6 *ifmca; 3479 struct ifacaddr6 *ifaca; 3480 struct net *net = sock_net(skb->sk); 3481 3482 s_idx = cb->args[0]; 3483 s_ip_idx = ip_idx = cb->args[1]; 3484 3485 idx = 0; 3486 for_each_netdev(net, dev) { 3487 if (idx < s_idx) 3488 goto cont; 3489 if (idx > s_idx) 3490 s_ip_idx = 0; 3491 ip_idx = 0; 3492 if ((idev = in6_dev_get(dev)) == NULL) 3493 goto cont; 3494 read_lock_bh(&idev->lock); 3495 switch (type) { 3496 case UNICAST_ADDR: 3497 /* unicast address incl. temp addr */ 3498 for (ifa = idev->addr_list; ifa; 3499 ifa = ifa->if_next, ip_idx++) { 3500 if (ip_idx < s_ip_idx) 3501 continue; 3502 err = inet6_fill_ifaddr(skb, ifa, 3503 NETLINK_CB(cb->skb).pid, 3504 cb->nlh->nlmsg_seq, 3505 RTM_NEWADDR, 3506 NLM_F_MULTI); 3507 } 3508 break; 3509 case MULTICAST_ADDR: 3510 /* multicast address */ 3511 for (ifmca = idev->mc_list; ifmca; 3512 ifmca = ifmca->next, ip_idx++) { 3513 if (ip_idx < s_ip_idx) 3514 continue; 3515 err = inet6_fill_ifmcaddr(skb, ifmca, 3516 NETLINK_CB(cb->skb).pid, 3517 cb->nlh->nlmsg_seq, 3518 RTM_GETMULTICAST, 3519 NLM_F_MULTI); 3520 } 3521 break; 3522 case ANYCAST_ADDR: 3523 /* anycast address */ 3524 for (ifaca = idev->ac_list; ifaca; 3525 ifaca = ifaca->aca_next, ip_idx++) { 3526 if (ip_idx < s_ip_idx) 3527 continue; 3528 err = inet6_fill_ifacaddr(skb, ifaca, 3529 NETLINK_CB(cb->skb).pid, 3530 cb->nlh->nlmsg_seq, 3531 RTM_GETANYCAST, 3532 NLM_F_MULTI); 3533 } 3534 break; 3535 default: 3536 break; 3537 } 3538 read_unlock_bh(&idev->lock); 3539 in6_dev_put(idev); 3540 3541 if (err <= 0) 3542 break; 3543 cont: 3544 idx++; 3545 } 3546 cb->args[0] = idx; 3547 cb->args[1] = ip_idx; 3548 return skb->len; 3549 } 3550 3551 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3552 { 3553 enum addr_type_t type = UNICAST_ADDR; 3554 3555 return inet6_dump_addr(skb, cb, type); 3556 } 3557 3558 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3559 { 3560 enum addr_type_t type = MULTICAST_ADDR; 3561 3562 return inet6_dump_addr(skb, cb, type); 3563 } 3564 3565 3566 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3567 { 3568 enum addr_type_t type = ANYCAST_ADDR; 3569 3570 return inet6_dump_addr(skb, cb, type); 3571 } 3572 3573 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3574 void *arg) 3575 { 3576 struct net *net = sock_net(in_skb->sk); 3577 struct ifaddrmsg *ifm; 3578 struct nlattr *tb[IFA_MAX+1]; 3579 struct in6_addr *addr = NULL; 3580 struct net_device *dev = NULL; 3581 struct inet6_ifaddr *ifa; 3582 struct sk_buff *skb; 3583 int err; 3584 3585 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3586 if (err < 0) 3587 goto errout; 3588 3589 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3590 if (addr == NULL) { 3591 err = -EINVAL; 3592 goto errout; 3593 } 3594 3595 ifm = nlmsg_data(nlh); 3596 if (ifm->ifa_index) 3597 dev = __dev_get_by_index(net, ifm->ifa_index); 3598 3599 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3600 err = -EADDRNOTAVAIL; 3601 goto errout; 3602 } 3603 3604 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3605 err = -ENOBUFS; 3606 goto errout_ifa; 3607 } 3608 3609 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3610 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3611 if (err < 0) { 3612 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3613 WARN_ON(err == -EMSGSIZE); 3614 kfree_skb(skb); 3615 goto errout_ifa; 3616 } 3617 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3618 errout_ifa: 3619 in6_ifa_put(ifa); 3620 errout: 3621 return err; 3622 } 3623 3624 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3625 { 3626 struct sk_buff *skb; 3627 struct net *net = dev_net(ifa->idev->dev); 3628 int err = -ENOBUFS; 3629 3630 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3631 if (skb == NULL) 3632 goto errout; 3633 3634 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3635 if (err < 0) { 3636 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3637 WARN_ON(err == -EMSGSIZE); 3638 kfree_skb(skb); 3639 goto errout; 3640 } 3641 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3642 return; 3643 errout: 3644 if (err < 0) 3645 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3646 } 3647 3648 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3649 __s32 *array, int bytes) 3650 { 3651 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3652 3653 memset(array, 0, bytes); 3654 array[DEVCONF_FORWARDING] = cnf->forwarding; 3655 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3656 array[DEVCONF_MTU6] = cnf->mtu6; 3657 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3658 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3659 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3660 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3661 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3662 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3663 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3664 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3665 #ifdef CONFIG_IPV6_PRIVACY 3666 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3667 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3668 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3669 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3670 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3671 #endif 3672 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3673 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3674 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3675 #ifdef CONFIG_IPV6_ROUTER_PREF 3676 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3677 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3678 #ifdef CONFIG_IPV6_ROUTE_INFO 3679 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3680 #endif 3681 #endif 3682 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3683 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3684 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3685 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3686 #endif 3687 #ifdef CONFIG_IPV6_MROUTE 3688 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3689 #endif 3690 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3691 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3692 } 3693 3694 static inline size_t inet6_if_nlmsg_size(void) 3695 { 3696 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3697 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3698 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3699 + nla_total_size(4) /* IFLA_MTU */ 3700 + nla_total_size(4) /* IFLA_LINK */ 3701 + nla_total_size( /* IFLA_PROTINFO */ 3702 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3703 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3704 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3705 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3706 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3707 ); 3708 } 3709 3710 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3711 int bytes) 3712 { 3713 int i; 3714 int pad = bytes - sizeof(u64) * items; 3715 BUG_ON(pad < 0); 3716 3717 /* Use put_unaligned() because stats may not be aligned for u64. */ 3718 put_unaligned(items, &stats[0]); 3719 for (i = 1; i < items; i++) 3720 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3721 3722 memset(&stats[items], 0, pad); 3723 } 3724 3725 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3726 int bytes) 3727 { 3728 switch(attrtype) { 3729 case IFLA_INET6_STATS: 3730 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3731 break; 3732 case IFLA_INET6_ICMP6STATS: 3733 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3734 break; 3735 } 3736 } 3737 3738 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3739 u32 pid, u32 seq, int event, unsigned int flags) 3740 { 3741 struct net_device *dev = idev->dev; 3742 struct nlattr *nla; 3743 struct ifinfomsg *hdr; 3744 struct nlmsghdr *nlh; 3745 void *protoinfo; 3746 struct ifla_cacheinfo ci; 3747 3748 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3749 if (nlh == NULL) 3750 return -EMSGSIZE; 3751 3752 hdr = nlmsg_data(nlh); 3753 hdr->ifi_family = AF_INET6; 3754 hdr->__ifi_pad = 0; 3755 hdr->ifi_type = dev->type; 3756 hdr->ifi_index = dev->ifindex; 3757 hdr->ifi_flags = dev_get_flags(dev); 3758 hdr->ifi_change = 0; 3759 3760 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3761 3762 if (dev->addr_len) 3763 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3764 3765 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3766 if (dev->ifindex != dev->iflink) 3767 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3768 3769 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3770 if (protoinfo == NULL) 3771 goto nla_put_failure; 3772 3773 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3774 3775 ci.max_reasm_len = IPV6_MAXPLEN; 3776 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3777 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3778 ci.reachable_time = idev->nd_parms->reachable_time; 3779 ci.retrans_time = idev->nd_parms->retrans_time; 3780 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3781 3782 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3783 if (nla == NULL) 3784 goto nla_put_failure; 3785 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3786 3787 /* XXX - MC not implemented */ 3788 3789 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3790 if (nla == NULL) 3791 goto nla_put_failure; 3792 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3793 3794 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3795 if (nla == NULL) 3796 goto nla_put_failure; 3797 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3798 3799 nla_nest_end(skb, protoinfo); 3800 return nlmsg_end(skb, nlh); 3801 3802 nla_put_failure: 3803 nlmsg_cancel(skb, nlh); 3804 return -EMSGSIZE; 3805 } 3806 3807 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3808 { 3809 struct net *net = sock_net(skb->sk); 3810 int idx, err; 3811 int s_idx = cb->args[0]; 3812 struct net_device *dev; 3813 struct inet6_dev *idev; 3814 3815 read_lock(&dev_base_lock); 3816 idx = 0; 3817 for_each_netdev(net, dev) { 3818 if (idx < s_idx) 3819 goto cont; 3820 if ((idev = in6_dev_get(dev)) == NULL) 3821 goto cont; 3822 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3823 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3824 in6_dev_put(idev); 3825 if (err <= 0) 3826 break; 3827 cont: 3828 idx++; 3829 } 3830 read_unlock(&dev_base_lock); 3831 cb->args[0] = idx; 3832 3833 return skb->len; 3834 } 3835 3836 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3837 { 3838 struct sk_buff *skb; 3839 struct net *net = dev_net(idev->dev); 3840 int err = -ENOBUFS; 3841 3842 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3843 if (skb == NULL) 3844 goto errout; 3845 3846 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3847 if (err < 0) { 3848 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3849 WARN_ON(err == -EMSGSIZE); 3850 kfree_skb(skb); 3851 goto errout; 3852 } 3853 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3854 return; 3855 errout: 3856 if (err < 0) 3857 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3858 } 3859 3860 static inline size_t inet6_prefix_nlmsg_size(void) 3861 { 3862 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3863 + nla_total_size(sizeof(struct in6_addr)) 3864 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3865 } 3866 3867 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3868 struct prefix_info *pinfo, u32 pid, u32 seq, 3869 int event, unsigned int flags) 3870 { 3871 struct prefixmsg *pmsg; 3872 struct nlmsghdr *nlh; 3873 struct prefix_cacheinfo ci; 3874 3875 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3876 if (nlh == NULL) 3877 return -EMSGSIZE; 3878 3879 pmsg = nlmsg_data(nlh); 3880 pmsg->prefix_family = AF_INET6; 3881 pmsg->prefix_pad1 = 0; 3882 pmsg->prefix_pad2 = 0; 3883 pmsg->prefix_ifindex = idev->dev->ifindex; 3884 pmsg->prefix_len = pinfo->prefix_len; 3885 pmsg->prefix_type = pinfo->type; 3886 pmsg->prefix_pad3 = 0; 3887 pmsg->prefix_flags = 0; 3888 if (pinfo->onlink) 3889 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3890 if (pinfo->autoconf) 3891 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3892 3893 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3894 3895 ci.preferred_time = ntohl(pinfo->prefered); 3896 ci.valid_time = ntohl(pinfo->valid); 3897 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3898 3899 return nlmsg_end(skb, nlh); 3900 3901 nla_put_failure: 3902 nlmsg_cancel(skb, nlh); 3903 return -EMSGSIZE; 3904 } 3905 3906 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3907 struct prefix_info *pinfo) 3908 { 3909 struct sk_buff *skb; 3910 struct net *net = dev_net(idev->dev); 3911 int err = -ENOBUFS; 3912 3913 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3914 if (skb == NULL) 3915 goto errout; 3916 3917 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3918 if (err < 0) { 3919 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3920 WARN_ON(err == -EMSGSIZE); 3921 kfree_skb(skb); 3922 goto errout; 3923 } 3924 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3925 return; 3926 errout: 3927 if (err < 0) 3928 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3929 } 3930 3931 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3932 { 3933 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3934 3935 switch (event) { 3936 case RTM_NEWADDR: 3937 /* 3938 * If the address was optimistic 3939 * we inserted the route at the start of 3940 * our DAD process, so we don't need 3941 * to do it again 3942 */ 3943 if (!(ifp->rt->rt6i_node)) 3944 ip6_ins_rt(ifp->rt); 3945 if (ifp->idev->cnf.forwarding) 3946 addrconf_join_anycast(ifp); 3947 break; 3948 case RTM_DELADDR: 3949 if (ifp->idev->cnf.forwarding) 3950 addrconf_leave_anycast(ifp); 3951 addrconf_leave_solict(ifp->idev, &ifp->addr); 3952 dst_hold(&ifp->rt->u.dst); 3953 if (ip6_del_rt(ifp->rt)) 3954 dst_free(&ifp->rt->u.dst); 3955 break; 3956 } 3957 } 3958 3959 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3960 { 3961 rcu_read_lock_bh(); 3962 if (likely(ifp->idev->dead == 0)) 3963 __ipv6_ifa_notify(event, ifp); 3964 rcu_read_unlock_bh(); 3965 } 3966 3967 #ifdef CONFIG_SYSCTL 3968 3969 static 3970 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3971 void __user *buffer, size_t *lenp, loff_t *ppos) 3972 { 3973 int *valp = ctl->data; 3974 int val = *valp; 3975 int ret; 3976 3977 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3978 3979 if (write) 3980 addrconf_fixup_forwarding(ctl, valp, val); 3981 return ret; 3982 } 3983 3984 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3985 void __user *oldval, 3986 size_t __user *oldlenp, 3987 void __user *newval, size_t newlen) 3988 { 3989 int *valp = table->data; 3990 int val = *valp; 3991 int new; 3992 3993 if (!newval || !newlen) 3994 return 0; 3995 if (newlen != sizeof(int)) 3996 return -EINVAL; 3997 if (get_user(new, (int __user *)newval)) 3998 return -EFAULT; 3999 if (new == *valp) 4000 return 0; 4001 if (oldval && oldlenp) { 4002 size_t len; 4003 if (get_user(len, oldlenp)) 4004 return -EFAULT; 4005 if (len) { 4006 if (len > table->maxlen) 4007 len = table->maxlen; 4008 if (copy_to_user(oldval, valp, len)) 4009 return -EFAULT; 4010 if (put_user(len, oldlenp)) 4011 return -EFAULT; 4012 } 4013 } 4014 4015 *valp = new; 4016 addrconf_fixup_forwarding(table, valp, val); 4017 return 1; 4018 } 4019 4020 static struct addrconf_sysctl_table 4021 { 4022 struct ctl_table_header *sysctl_header; 4023 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4024 char *dev_name; 4025 } addrconf_sysctl __read_mostly = { 4026 .sysctl_header = NULL, 4027 .addrconf_vars = { 4028 { 4029 .ctl_name = NET_IPV6_FORWARDING, 4030 .procname = "forwarding", 4031 .data = &ipv6_devconf.forwarding, 4032 .maxlen = sizeof(int), 4033 .mode = 0644, 4034 .proc_handler = addrconf_sysctl_forward, 4035 .strategy = addrconf_sysctl_forward_strategy, 4036 }, 4037 { 4038 .ctl_name = NET_IPV6_HOP_LIMIT, 4039 .procname = "hop_limit", 4040 .data = &ipv6_devconf.hop_limit, 4041 .maxlen = sizeof(int), 4042 .mode = 0644, 4043 .proc_handler = proc_dointvec, 4044 }, 4045 { 4046 .ctl_name = NET_IPV6_MTU, 4047 .procname = "mtu", 4048 .data = &ipv6_devconf.mtu6, 4049 .maxlen = sizeof(int), 4050 .mode = 0644, 4051 .proc_handler = proc_dointvec, 4052 }, 4053 { 4054 .ctl_name = NET_IPV6_ACCEPT_RA, 4055 .procname = "accept_ra", 4056 .data = &ipv6_devconf.accept_ra, 4057 .maxlen = sizeof(int), 4058 .mode = 0644, 4059 .proc_handler = proc_dointvec, 4060 }, 4061 { 4062 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 4063 .procname = "accept_redirects", 4064 .data = &ipv6_devconf.accept_redirects, 4065 .maxlen = sizeof(int), 4066 .mode = 0644, 4067 .proc_handler = proc_dointvec, 4068 }, 4069 { 4070 .ctl_name = NET_IPV6_AUTOCONF, 4071 .procname = "autoconf", 4072 .data = &ipv6_devconf.autoconf, 4073 .maxlen = sizeof(int), 4074 .mode = 0644, 4075 .proc_handler = proc_dointvec, 4076 }, 4077 { 4078 .ctl_name = NET_IPV6_DAD_TRANSMITS, 4079 .procname = "dad_transmits", 4080 .data = &ipv6_devconf.dad_transmits, 4081 .maxlen = sizeof(int), 4082 .mode = 0644, 4083 .proc_handler = proc_dointvec, 4084 }, 4085 { 4086 .ctl_name = NET_IPV6_RTR_SOLICITS, 4087 .procname = "router_solicitations", 4088 .data = &ipv6_devconf.rtr_solicits, 4089 .maxlen = sizeof(int), 4090 .mode = 0644, 4091 .proc_handler = proc_dointvec, 4092 }, 4093 { 4094 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 4095 .procname = "router_solicitation_interval", 4096 .data = &ipv6_devconf.rtr_solicit_interval, 4097 .maxlen = sizeof(int), 4098 .mode = 0644, 4099 .proc_handler = proc_dointvec_jiffies, 4100 .strategy = sysctl_jiffies, 4101 }, 4102 { 4103 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 4104 .procname = "router_solicitation_delay", 4105 .data = &ipv6_devconf.rtr_solicit_delay, 4106 .maxlen = sizeof(int), 4107 .mode = 0644, 4108 .proc_handler = proc_dointvec_jiffies, 4109 .strategy = sysctl_jiffies, 4110 }, 4111 { 4112 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 4113 .procname = "force_mld_version", 4114 .data = &ipv6_devconf.force_mld_version, 4115 .maxlen = sizeof(int), 4116 .mode = 0644, 4117 .proc_handler = proc_dointvec, 4118 }, 4119 #ifdef CONFIG_IPV6_PRIVACY 4120 { 4121 .ctl_name = NET_IPV6_USE_TEMPADDR, 4122 .procname = "use_tempaddr", 4123 .data = &ipv6_devconf.use_tempaddr, 4124 .maxlen = sizeof(int), 4125 .mode = 0644, 4126 .proc_handler = proc_dointvec, 4127 }, 4128 { 4129 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 4130 .procname = "temp_valid_lft", 4131 .data = &ipv6_devconf.temp_valid_lft, 4132 .maxlen = sizeof(int), 4133 .mode = 0644, 4134 .proc_handler = proc_dointvec, 4135 }, 4136 { 4137 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 4138 .procname = "temp_prefered_lft", 4139 .data = &ipv6_devconf.temp_prefered_lft, 4140 .maxlen = sizeof(int), 4141 .mode = 0644, 4142 .proc_handler = proc_dointvec, 4143 }, 4144 { 4145 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4146 .procname = "regen_max_retry", 4147 .data = &ipv6_devconf.regen_max_retry, 4148 .maxlen = sizeof(int), 4149 .mode = 0644, 4150 .proc_handler = proc_dointvec, 4151 }, 4152 { 4153 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4154 .procname = "max_desync_factor", 4155 .data = &ipv6_devconf.max_desync_factor, 4156 .maxlen = sizeof(int), 4157 .mode = 0644, 4158 .proc_handler = proc_dointvec, 4159 }, 4160 #endif 4161 { 4162 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4163 .procname = "max_addresses", 4164 .data = &ipv6_devconf.max_addresses, 4165 .maxlen = sizeof(int), 4166 .mode = 0644, 4167 .proc_handler = proc_dointvec, 4168 }, 4169 { 4170 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4171 .procname = "accept_ra_defrtr", 4172 .data = &ipv6_devconf.accept_ra_defrtr, 4173 .maxlen = sizeof(int), 4174 .mode = 0644, 4175 .proc_handler = proc_dointvec, 4176 }, 4177 { 4178 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4179 .procname = "accept_ra_pinfo", 4180 .data = &ipv6_devconf.accept_ra_pinfo, 4181 .maxlen = sizeof(int), 4182 .mode = 0644, 4183 .proc_handler = proc_dointvec, 4184 }, 4185 #ifdef CONFIG_IPV6_ROUTER_PREF 4186 { 4187 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4188 .procname = "accept_ra_rtr_pref", 4189 .data = &ipv6_devconf.accept_ra_rtr_pref, 4190 .maxlen = sizeof(int), 4191 .mode = 0644, 4192 .proc_handler = proc_dointvec, 4193 }, 4194 { 4195 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4196 .procname = "router_probe_interval", 4197 .data = &ipv6_devconf.rtr_probe_interval, 4198 .maxlen = sizeof(int), 4199 .mode = 0644, 4200 .proc_handler = proc_dointvec_jiffies, 4201 .strategy = sysctl_jiffies, 4202 }, 4203 #ifdef CONFIG_IPV6_ROUTE_INFO 4204 { 4205 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4206 .procname = "accept_ra_rt_info_max_plen", 4207 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4208 .maxlen = sizeof(int), 4209 .mode = 0644, 4210 .proc_handler = proc_dointvec, 4211 }, 4212 #endif 4213 #endif 4214 { 4215 .ctl_name = NET_IPV6_PROXY_NDP, 4216 .procname = "proxy_ndp", 4217 .data = &ipv6_devconf.proxy_ndp, 4218 .maxlen = sizeof(int), 4219 .mode = 0644, 4220 .proc_handler = proc_dointvec, 4221 }, 4222 { 4223 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4224 .procname = "accept_source_route", 4225 .data = &ipv6_devconf.accept_source_route, 4226 .maxlen = sizeof(int), 4227 .mode = 0644, 4228 .proc_handler = proc_dointvec, 4229 }, 4230 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4231 { 4232 .ctl_name = CTL_UNNUMBERED, 4233 .procname = "optimistic_dad", 4234 .data = &ipv6_devconf.optimistic_dad, 4235 .maxlen = sizeof(int), 4236 .mode = 0644, 4237 .proc_handler = proc_dointvec, 4238 4239 }, 4240 #endif 4241 #ifdef CONFIG_IPV6_MROUTE 4242 { 4243 .ctl_name = CTL_UNNUMBERED, 4244 .procname = "mc_forwarding", 4245 .data = &ipv6_devconf.mc_forwarding, 4246 .maxlen = sizeof(int), 4247 .mode = 0444, 4248 .proc_handler = proc_dointvec, 4249 }, 4250 #endif 4251 { 4252 .ctl_name = CTL_UNNUMBERED, 4253 .procname = "disable_ipv6", 4254 .data = &ipv6_devconf.disable_ipv6, 4255 .maxlen = sizeof(int), 4256 .mode = 0644, 4257 .proc_handler = proc_dointvec, 4258 }, 4259 { 4260 .ctl_name = CTL_UNNUMBERED, 4261 .procname = "accept_dad", 4262 .data = &ipv6_devconf.accept_dad, 4263 .maxlen = sizeof(int), 4264 .mode = 0644, 4265 .proc_handler = proc_dointvec, 4266 }, 4267 { 4268 .ctl_name = 0, /* sentinel */ 4269 } 4270 }, 4271 }; 4272 4273 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4274 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4275 { 4276 int i; 4277 struct addrconf_sysctl_table *t; 4278 4279 #define ADDRCONF_CTL_PATH_DEV 3 4280 4281 struct ctl_path addrconf_ctl_path[] = { 4282 { .procname = "net", .ctl_name = CTL_NET, }, 4283 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4284 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4285 { /* to be set */ }, 4286 { }, 4287 }; 4288 4289 4290 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4291 if (t == NULL) 4292 goto out; 4293 4294 for (i=0; t->addrconf_vars[i].data; i++) { 4295 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4296 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4297 t->addrconf_vars[i].extra2 = net; 4298 } 4299 4300 /* 4301 * Make a copy of dev_name, because '.procname' is regarded as const 4302 * by sysctl and we wouldn't want anyone to change it under our feet 4303 * (see SIOCSIFNAME). 4304 */ 4305 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4306 if (!t->dev_name) 4307 goto free; 4308 4309 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4310 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4311 4312 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4313 t->addrconf_vars); 4314 if (t->sysctl_header == NULL) 4315 goto free_procname; 4316 4317 p->sysctl = t; 4318 return 0; 4319 4320 free_procname: 4321 kfree(t->dev_name); 4322 free: 4323 kfree(t); 4324 out: 4325 return -ENOBUFS; 4326 } 4327 4328 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4329 { 4330 struct addrconf_sysctl_table *t; 4331 4332 if (p->sysctl == NULL) 4333 return; 4334 4335 t = p->sysctl; 4336 p->sysctl = NULL; 4337 unregister_sysctl_table(t->sysctl_header); 4338 kfree(t->dev_name); 4339 kfree(t); 4340 } 4341 4342 static void addrconf_sysctl_register(struct inet6_dev *idev) 4343 { 4344 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4345 NET_IPV6_NEIGH, "ipv6", 4346 &ndisc_ifinfo_sysctl_change, 4347 ndisc_ifinfo_sysctl_strategy); 4348 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4349 idev->dev->ifindex, idev, &idev->cnf); 4350 } 4351 4352 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4353 { 4354 __addrconf_sysctl_unregister(&idev->cnf); 4355 neigh_sysctl_unregister(idev->nd_parms); 4356 } 4357 4358 4359 #endif 4360 4361 static int addrconf_init_net(struct net *net) 4362 { 4363 int err; 4364 struct ipv6_devconf *all, *dflt; 4365 4366 err = -ENOMEM; 4367 all = &ipv6_devconf; 4368 dflt = &ipv6_devconf_dflt; 4369 4370 if (net != &init_net) { 4371 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4372 if (all == NULL) 4373 goto err_alloc_all; 4374 4375 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4376 if (dflt == NULL) 4377 goto err_alloc_dflt; 4378 } 4379 4380 net->ipv6.devconf_all = all; 4381 net->ipv6.devconf_dflt = dflt; 4382 4383 #ifdef CONFIG_SYSCTL 4384 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4385 NULL, all); 4386 if (err < 0) 4387 goto err_reg_all; 4388 4389 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4390 NULL, dflt); 4391 if (err < 0) 4392 goto err_reg_dflt; 4393 #endif 4394 return 0; 4395 4396 #ifdef CONFIG_SYSCTL 4397 err_reg_dflt: 4398 __addrconf_sysctl_unregister(all); 4399 err_reg_all: 4400 kfree(dflt); 4401 #endif 4402 err_alloc_dflt: 4403 kfree(all); 4404 err_alloc_all: 4405 return err; 4406 } 4407 4408 static void addrconf_exit_net(struct net *net) 4409 { 4410 #ifdef CONFIG_SYSCTL 4411 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4412 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4413 #endif 4414 if (net != &init_net) { 4415 kfree(net->ipv6.devconf_dflt); 4416 kfree(net->ipv6.devconf_all); 4417 } 4418 } 4419 4420 static struct pernet_operations addrconf_ops = { 4421 .init = addrconf_init_net, 4422 .exit = addrconf_exit_net, 4423 }; 4424 4425 /* 4426 * Device notifier 4427 */ 4428 4429 int register_inet6addr_notifier(struct notifier_block *nb) 4430 { 4431 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4432 } 4433 4434 EXPORT_SYMBOL(register_inet6addr_notifier); 4435 4436 int unregister_inet6addr_notifier(struct notifier_block *nb) 4437 { 4438 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4439 } 4440 4441 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4442 4443 static void addrconf_net_exit(struct net *net) 4444 { 4445 struct net_device *dev; 4446 4447 rtnl_lock(); 4448 /* clean dev list */ 4449 for_each_netdev(net, dev) { 4450 if (__in6_dev_get(dev) == NULL) 4451 continue; 4452 addrconf_ifdown(dev, 1); 4453 } 4454 addrconf_ifdown(net->loopback_dev, 2); 4455 rtnl_unlock(); 4456 } 4457 4458 static struct pernet_operations addrconf_net_ops = { 4459 .exit = addrconf_net_exit, 4460 }; 4461 4462 /* 4463 * Init / cleanup code 4464 */ 4465 4466 int __init addrconf_init(void) 4467 { 4468 int err; 4469 4470 if ((err = ipv6_addr_label_init()) < 0) { 4471 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4472 err); 4473 return err; 4474 } 4475 4476 register_pernet_subsys(&addrconf_ops); 4477 4478 /* The addrconf netdev notifier requires that loopback_dev 4479 * has it's ipv6 private information allocated and setup 4480 * before it can bring up and give link-local addresses 4481 * to other devices which are up. 4482 * 4483 * Unfortunately, loopback_dev is not necessarily the first 4484 * entry in the global dev_base list of net devices. In fact, 4485 * it is likely to be the very last entry on that list. 4486 * So this causes the notifier registry below to try and 4487 * give link-local addresses to all devices besides loopback_dev 4488 * first, then loopback_dev, which cases all the non-loopback_dev 4489 * devices to fail to get a link-local address. 4490 * 4491 * So, as a temporary fix, allocate the ipv6 structure for 4492 * loopback_dev first by hand. 4493 * Longer term, all of the dependencies ipv6 has upon the loopback 4494 * device and it being up should be removed. 4495 */ 4496 rtnl_lock(); 4497 if (!ipv6_add_dev(init_net.loopback_dev)) 4498 err = -ENOMEM; 4499 rtnl_unlock(); 4500 if (err) 4501 goto errlo; 4502 4503 err = register_pernet_device(&addrconf_net_ops); 4504 if (err) 4505 return err; 4506 4507 register_netdevice_notifier(&ipv6_dev_notf); 4508 4509 addrconf_verify(0); 4510 4511 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4512 if (err < 0) 4513 goto errout; 4514 4515 /* Only the first call to __rtnl_register can fail */ 4516 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4517 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4518 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4519 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4520 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4521 4522 ipv6_addr_label_rtnl_register(); 4523 4524 return 0; 4525 errout: 4526 unregister_netdevice_notifier(&ipv6_dev_notf); 4527 errlo: 4528 unregister_pernet_subsys(&addrconf_ops); 4529 4530 return err; 4531 } 4532 4533 void addrconf_cleanup(void) 4534 { 4535 struct inet6_ifaddr *ifa; 4536 int i; 4537 4538 unregister_netdevice_notifier(&ipv6_dev_notf); 4539 unregister_pernet_device(&addrconf_net_ops); 4540 4541 unregister_pernet_subsys(&addrconf_ops); 4542 4543 rtnl_lock(); 4544 4545 /* 4546 * Check hash table. 4547 */ 4548 write_lock_bh(&addrconf_hash_lock); 4549 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4550 for (ifa=inet6_addr_lst[i]; ifa; ) { 4551 struct inet6_ifaddr *bifa; 4552 4553 bifa = ifa; 4554 ifa = ifa->lst_next; 4555 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4556 /* Do not free it; something is wrong. 4557 Now we can investigate it with debugger. 4558 */ 4559 } 4560 } 4561 write_unlock_bh(&addrconf_hash_lock); 4562 4563 del_timer(&addr_chk_timer); 4564 rtnl_unlock(); 4565 4566 unregister_pernet_subsys(&addrconf_net_ops); 4567 } 4568