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 BUG_TRAP(idev->addr_list==NULL); 317 BUG_TRAP(idev->mc_list==NULL); 318 #ifdef NET_REFCNT_DEBUG 319 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 320 #endif 321 dev_put(dev); 322 if (!idev->dead) { 323 printk("Freeing alive inet6 device %p\n", idev); 324 return; 325 } 326 snmp6_free_dev(idev); 327 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 328 } 329 330 EXPORT_SYMBOL(in6_dev_finish_destroy); 331 332 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 333 { 334 struct inet6_dev *ndev; 335 336 ASSERT_RTNL(); 337 338 if (dev->mtu < IPV6_MIN_MTU) 339 return NULL; 340 341 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 342 343 if (ndev == NULL) 344 return NULL; 345 346 rwlock_init(&ndev->lock); 347 ndev->dev = dev; 348 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 349 ndev->cnf.mtu6 = dev->mtu; 350 ndev->cnf.sysctl = NULL; 351 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 352 if (ndev->nd_parms == NULL) { 353 kfree(ndev); 354 return NULL; 355 } 356 if (ndev->cnf.forwarding) 357 dev_disable_lro(dev); 358 /* We refer to the device */ 359 dev_hold(dev); 360 361 if (snmp6_alloc_dev(ndev) < 0) { 362 ADBG((KERN_WARNING 363 "%s(): cannot allocate memory for statistics; dev=%s.\n", 364 __func__, dev->name)); 365 neigh_parms_release(&nd_tbl, ndev->nd_parms); 366 ndev->dead = 1; 367 in6_dev_finish_destroy(ndev); 368 return NULL; 369 } 370 371 if (snmp6_register_dev(ndev) < 0) { 372 ADBG((KERN_WARNING 373 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 374 __func__, dev->name)); 375 neigh_parms_release(&nd_tbl, ndev->nd_parms); 376 ndev->dead = 1; 377 in6_dev_finish_destroy(ndev); 378 return NULL; 379 } 380 381 /* One reference from device. We must do this before 382 * we invoke __ipv6_regen_rndid(). 383 */ 384 in6_dev_hold(ndev); 385 386 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 387 ndev->cnf.accept_dad = -1; 388 389 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 390 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 391 printk(KERN_INFO 392 "%s: Disabled Multicast RS\n", 393 dev->name); 394 ndev->cnf.rtr_solicits = 0; 395 } 396 #endif 397 398 #ifdef CONFIG_IPV6_PRIVACY 399 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 400 if ((dev->flags&IFF_LOOPBACK) || 401 dev->type == ARPHRD_TUNNEL || 402 dev->type == ARPHRD_TUNNEL6 || 403 dev->type == ARPHRD_SIT || 404 dev->type == ARPHRD_NONE) { 405 printk(KERN_INFO 406 "%s: Disabled Privacy Extensions\n", 407 dev->name); 408 ndev->cnf.use_tempaddr = -1; 409 } else { 410 in6_dev_hold(ndev); 411 ipv6_regen_rndid((unsigned long) ndev); 412 } 413 #endif 414 415 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 416 ndev->if_flags |= IF_READY; 417 418 ipv6_mc_init_dev(ndev); 419 ndev->tstamp = jiffies; 420 addrconf_sysctl_register(ndev); 421 /* protected by rtnl_lock */ 422 rcu_assign_pointer(dev->ip6_ptr, ndev); 423 424 /* Join all-node multicast group */ 425 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 426 427 return ndev; 428 } 429 430 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 431 { 432 struct inet6_dev *idev; 433 434 ASSERT_RTNL(); 435 436 if ((idev = __in6_dev_get(dev)) == NULL) { 437 if ((idev = ipv6_add_dev(dev)) == NULL) 438 return NULL; 439 } 440 441 if (dev->flags&IFF_UP) 442 ipv6_mc_up(idev); 443 return idev; 444 } 445 446 #ifdef CONFIG_SYSCTL 447 static void dev_forward_change(struct inet6_dev *idev) 448 { 449 struct net_device *dev; 450 struct inet6_ifaddr *ifa; 451 452 if (!idev) 453 return; 454 dev = idev->dev; 455 if (idev->cnf.forwarding) 456 dev_disable_lro(dev); 457 if (dev && (dev->flags & IFF_MULTICAST)) { 458 if (idev->cnf.forwarding) 459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 460 else 461 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 462 } 463 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 464 if (ifa->flags&IFA_F_TENTATIVE) 465 continue; 466 if (idev->cnf.forwarding) 467 addrconf_join_anycast(ifa); 468 else 469 addrconf_leave_anycast(ifa); 470 } 471 } 472 473 474 static void addrconf_forward_change(struct net *net, __s32 newf) 475 { 476 struct net_device *dev; 477 struct inet6_dev *idev; 478 479 read_lock(&dev_base_lock); 480 for_each_netdev(net, dev) { 481 rcu_read_lock(); 482 idev = __in6_dev_get(dev); 483 if (idev) { 484 int changed = (!idev->cnf.forwarding) ^ (!newf); 485 idev->cnf.forwarding = newf; 486 if (changed) 487 dev_forward_change(idev); 488 } 489 rcu_read_unlock(); 490 } 491 read_unlock(&dev_base_lock); 492 } 493 494 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 495 { 496 struct net *net; 497 498 net = (struct net *)table->extra2; 499 if (p == &net->ipv6.devconf_dflt->forwarding) 500 return; 501 502 rtnl_lock(); 503 if (p == &net->ipv6.devconf_all->forwarding) { 504 __s32 newf = net->ipv6.devconf_all->forwarding; 505 net->ipv6.devconf_dflt->forwarding = newf; 506 addrconf_forward_change(net, newf); 507 } else if ((!*p) ^ (!old)) 508 dev_forward_change((struct inet6_dev *)table->extra1); 509 rtnl_unlock(); 510 511 if (*p) 512 rt6_purge_dflt_routers(net); 513 } 514 #endif 515 516 /* Nobody refers to this ifaddr, destroy it */ 517 518 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 519 { 520 BUG_TRAP(ifp->if_next==NULL); 521 BUG_TRAP(ifp->lst_next==NULL); 522 #ifdef NET_REFCNT_DEBUG 523 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 524 #endif 525 526 in6_dev_put(ifp->idev); 527 528 if (del_timer(&ifp->timer)) 529 printk("Timer is still running, when freeing ifa=%p\n", ifp); 530 531 if (!ifp->dead) { 532 printk("Freeing alive inet6 address %p\n", ifp); 533 return; 534 } 535 dst_release(&ifp->rt->u.dst); 536 537 kfree(ifp); 538 } 539 540 static void 541 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 542 { 543 struct inet6_ifaddr *ifa, **ifap; 544 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 545 546 /* 547 * Each device address list is sorted in order of scope - 548 * global before linklocal. 549 */ 550 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 551 ifap = &ifa->if_next) { 552 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 553 break; 554 } 555 556 ifp->if_next = *ifap; 557 *ifap = ifp; 558 } 559 560 /* 561 * Hash function taken from net_alias.c 562 */ 563 static u8 ipv6_addr_hash(const struct in6_addr *addr) 564 { 565 __u32 word; 566 567 /* 568 * We perform the hash function over the last 64 bits of the address 569 * This will include the IEEE address token on links that support it. 570 */ 571 572 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]); 573 word ^= (word >> 16); 574 word ^= (word >> 8); 575 576 return ((word ^ (word >> 4)) & 0x0f); 577 } 578 579 /* On success it returns ifp with increased reference count */ 580 581 static struct inet6_ifaddr * 582 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 583 int scope, u32 flags) 584 { 585 struct inet6_ifaddr *ifa = NULL; 586 struct rt6_info *rt; 587 int hash; 588 int err = 0; 589 int addr_type = ipv6_addr_type(addr); 590 591 if (addr_type == IPV6_ADDR_ANY || 592 addr_type & IPV6_ADDR_MULTICAST || 593 (!(idev->dev->flags & IFF_LOOPBACK) && 594 addr_type & IPV6_ADDR_LOOPBACK)) 595 return ERR_PTR(-EADDRNOTAVAIL); 596 597 rcu_read_lock_bh(); 598 if (idev->dead) { 599 err = -ENODEV; /*XXX*/ 600 goto out2; 601 } 602 603 write_lock(&addrconf_hash_lock); 604 605 /* Ignore adding duplicate addresses on an interface */ 606 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 607 ADBG(("ipv6_add_addr: already assigned\n")); 608 err = -EEXIST; 609 goto out; 610 } 611 612 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 613 614 if (ifa == NULL) { 615 ADBG(("ipv6_add_addr: malloc failed\n")); 616 err = -ENOBUFS; 617 goto out; 618 } 619 620 rt = addrconf_dst_alloc(idev, addr, 0); 621 if (IS_ERR(rt)) { 622 err = PTR_ERR(rt); 623 goto out; 624 } 625 626 ipv6_addr_copy(&ifa->addr, addr); 627 628 spin_lock_init(&ifa->lock); 629 init_timer(&ifa->timer); 630 ifa->timer.data = (unsigned long) ifa; 631 ifa->scope = scope; 632 ifa->prefix_len = pfxlen; 633 ifa->flags = flags | IFA_F_TENTATIVE; 634 ifa->cstamp = ifa->tstamp = jiffies; 635 636 ifa->rt = rt; 637 638 /* 639 * part one of RFC 4429, section 3.3 640 * We should not configure an address as 641 * optimistic if we do not yet know the link 642 * layer address of our nexhop router 643 */ 644 645 if (rt->rt6i_nexthop == NULL) 646 ifa->flags &= ~IFA_F_OPTIMISTIC; 647 648 ifa->idev = idev; 649 in6_dev_hold(idev); 650 /* For caller */ 651 in6_ifa_hold(ifa); 652 653 /* Add to big hash table */ 654 hash = ipv6_addr_hash(addr); 655 656 ifa->lst_next = inet6_addr_lst[hash]; 657 inet6_addr_lst[hash] = ifa; 658 in6_ifa_hold(ifa); 659 write_unlock(&addrconf_hash_lock); 660 661 write_lock(&idev->lock); 662 /* Add to inet6_dev unicast addr list. */ 663 ipv6_link_dev_addr(idev, ifa); 664 665 #ifdef CONFIG_IPV6_PRIVACY 666 if (ifa->flags&IFA_F_TEMPORARY) { 667 ifa->tmp_next = idev->tempaddr_list; 668 idev->tempaddr_list = ifa; 669 in6_ifa_hold(ifa); 670 } 671 #endif 672 673 in6_ifa_hold(ifa); 674 write_unlock(&idev->lock); 675 out2: 676 rcu_read_unlock_bh(); 677 678 if (likely(err == 0)) 679 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 680 else { 681 kfree(ifa); 682 ifa = ERR_PTR(err); 683 } 684 685 return ifa; 686 out: 687 write_unlock(&addrconf_hash_lock); 688 goto out2; 689 } 690 691 /* This function wants to get referenced ifp and releases it before return */ 692 693 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 694 { 695 struct inet6_ifaddr *ifa, **ifap; 696 struct inet6_dev *idev = ifp->idev; 697 int hash; 698 int deleted = 0, onlink = 0; 699 unsigned long expires = jiffies; 700 701 hash = ipv6_addr_hash(&ifp->addr); 702 703 ifp->dead = 1; 704 705 write_lock_bh(&addrconf_hash_lock); 706 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 707 ifap = &ifa->lst_next) { 708 if (ifa == ifp) { 709 *ifap = ifa->lst_next; 710 __in6_ifa_put(ifp); 711 ifa->lst_next = NULL; 712 break; 713 } 714 } 715 write_unlock_bh(&addrconf_hash_lock); 716 717 write_lock_bh(&idev->lock); 718 #ifdef CONFIG_IPV6_PRIVACY 719 if (ifp->flags&IFA_F_TEMPORARY) { 720 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 721 ifap = &ifa->tmp_next) { 722 if (ifa == ifp) { 723 *ifap = ifa->tmp_next; 724 if (ifp->ifpub) { 725 in6_ifa_put(ifp->ifpub); 726 ifp->ifpub = NULL; 727 } 728 __in6_ifa_put(ifp); 729 ifa->tmp_next = NULL; 730 break; 731 } 732 } 733 } 734 #endif 735 736 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 737 if (ifa == ifp) { 738 *ifap = ifa->if_next; 739 __in6_ifa_put(ifp); 740 ifa->if_next = NULL; 741 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 742 break; 743 deleted = 1; 744 continue; 745 } else if (ifp->flags & IFA_F_PERMANENT) { 746 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 747 ifp->prefix_len)) { 748 if (ifa->flags & IFA_F_PERMANENT) { 749 onlink = 1; 750 if (deleted) 751 break; 752 } else { 753 unsigned long lifetime; 754 755 if (!onlink) 756 onlink = -1; 757 758 spin_lock(&ifa->lock); 759 760 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 761 /* 762 * Note: Because this address is 763 * not permanent, lifetime < 764 * LONG_MAX / HZ here. 765 */ 766 if (time_before(expires, 767 ifa->tstamp + lifetime * HZ)) 768 expires = ifa->tstamp + lifetime * HZ; 769 spin_unlock(&ifa->lock); 770 } 771 } 772 } 773 ifap = &ifa->if_next; 774 } 775 write_unlock_bh(&idev->lock); 776 777 addrconf_del_timer(ifp); 778 779 ipv6_ifa_notify(RTM_DELADDR, ifp); 780 781 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 782 783 /* 784 * Purge or update corresponding prefix 785 * 786 * 1) we don't purge prefix here if address was not permanent. 787 * prefix is managed by its own lifetime. 788 * 2) if there're no addresses, delete prefix. 789 * 3) if there're still other permanent address(es), 790 * corresponding prefix is still permanent. 791 * 4) otherwise, update prefix lifetime to the 792 * longest valid lifetime among the corresponding 793 * addresses on the device. 794 * Note: subsequent RA will update lifetime. 795 * 796 * --yoshfuji 797 */ 798 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 799 struct in6_addr prefix; 800 struct rt6_info *rt; 801 struct net *net = dev_net(ifp->idev->dev); 802 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 803 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 804 805 if (rt && addrconf_is_prefix_route(rt)) { 806 if (onlink == 0) { 807 ip6_del_rt(rt); 808 rt = NULL; 809 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 810 rt->rt6i_expires = expires; 811 rt->rt6i_flags |= RTF_EXPIRES; 812 } 813 } 814 dst_release(&rt->u.dst); 815 } 816 817 in6_ifa_put(ifp); 818 } 819 820 #ifdef CONFIG_IPV6_PRIVACY 821 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 822 { 823 struct inet6_dev *idev = ifp->idev; 824 struct in6_addr addr, *tmpaddr; 825 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 826 unsigned long regen_advance; 827 int tmp_plen; 828 int ret = 0; 829 int max_addresses; 830 u32 addr_flags; 831 832 write_lock(&idev->lock); 833 if (ift) { 834 spin_lock_bh(&ift->lock); 835 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 836 spin_unlock_bh(&ift->lock); 837 tmpaddr = &addr; 838 } else { 839 tmpaddr = NULL; 840 } 841 retry: 842 in6_dev_hold(idev); 843 if (idev->cnf.use_tempaddr <= 0) { 844 write_unlock(&idev->lock); 845 printk(KERN_INFO 846 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 847 in6_dev_put(idev); 848 ret = -1; 849 goto out; 850 } 851 spin_lock_bh(&ifp->lock); 852 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 853 idev->cnf.use_tempaddr = -1; /*XXX*/ 854 spin_unlock_bh(&ifp->lock); 855 write_unlock(&idev->lock); 856 printk(KERN_WARNING 857 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 858 in6_dev_put(idev); 859 ret = -1; 860 goto out; 861 } 862 in6_ifa_hold(ifp); 863 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 864 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 865 spin_unlock_bh(&ifp->lock); 866 write_unlock(&idev->lock); 867 printk(KERN_WARNING 868 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 869 in6_ifa_put(ifp); 870 in6_dev_put(idev); 871 ret = -1; 872 goto out; 873 } 874 memcpy(&addr.s6_addr[8], idev->rndid, 8); 875 tmp_valid_lft = min_t(__u32, 876 ifp->valid_lft, 877 idev->cnf.temp_valid_lft); 878 tmp_prefered_lft = min_t(__u32, 879 ifp->prefered_lft, 880 idev->cnf.temp_prefered_lft - desync_factor / HZ); 881 tmp_plen = ifp->prefix_len; 882 max_addresses = idev->cnf.max_addresses; 883 tmp_cstamp = ifp->cstamp; 884 tmp_tstamp = ifp->tstamp; 885 spin_unlock_bh(&ifp->lock); 886 887 regen_advance = idev->cnf.regen_max_retry * 888 idev->cnf.dad_transmits * 889 idev->nd_parms->retrans_time / HZ; 890 write_unlock(&idev->lock); 891 892 /* A temporary address is created only if this calculated Preferred 893 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 894 * an implementation must not create a temporary address with a zero 895 * Preferred Lifetime. 896 */ 897 if (tmp_prefered_lft <= regen_advance) { 898 in6_ifa_put(ifp); 899 in6_dev_put(idev); 900 ret = -1; 901 goto out; 902 } 903 904 addr_flags = IFA_F_TEMPORARY; 905 /* set in addrconf_prefix_rcv() */ 906 if (ifp->flags & IFA_F_OPTIMISTIC) 907 addr_flags |= IFA_F_OPTIMISTIC; 908 909 ift = !max_addresses || 910 ipv6_count_addresses(idev) < max_addresses ? 911 ipv6_add_addr(idev, &addr, tmp_plen, 912 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 913 addr_flags) : NULL; 914 if (!ift || IS_ERR(ift)) { 915 in6_ifa_put(ifp); 916 in6_dev_put(idev); 917 printk(KERN_INFO 918 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 919 tmpaddr = &addr; 920 write_lock(&idev->lock); 921 goto retry; 922 } 923 924 spin_lock_bh(&ift->lock); 925 ift->ifpub = ifp; 926 ift->valid_lft = tmp_valid_lft; 927 ift->prefered_lft = tmp_prefered_lft; 928 ift->cstamp = tmp_cstamp; 929 ift->tstamp = tmp_tstamp; 930 spin_unlock_bh(&ift->lock); 931 932 addrconf_dad_start(ift, 0); 933 in6_ifa_put(ift); 934 in6_dev_put(idev); 935 out: 936 return ret; 937 } 938 #endif 939 940 /* 941 * Choose an appropriate source address (RFC3484) 942 */ 943 enum { 944 IPV6_SADDR_RULE_INIT = 0, 945 IPV6_SADDR_RULE_LOCAL, 946 IPV6_SADDR_RULE_SCOPE, 947 IPV6_SADDR_RULE_PREFERRED, 948 #ifdef CONFIG_IPV6_MIP6 949 IPV6_SADDR_RULE_HOA, 950 #endif 951 IPV6_SADDR_RULE_OIF, 952 IPV6_SADDR_RULE_LABEL, 953 #ifdef CONFIG_IPV6_PRIVACY 954 IPV6_SADDR_RULE_PRIVACY, 955 #endif 956 IPV6_SADDR_RULE_ORCHID, 957 IPV6_SADDR_RULE_PREFIX, 958 IPV6_SADDR_RULE_MAX 959 }; 960 961 struct ipv6_saddr_score { 962 int rule; 963 int addr_type; 964 struct inet6_ifaddr *ifa; 965 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 966 int scopedist; 967 int matchlen; 968 }; 969 970 struct ipv6_saddr_dst { 971 const struct in6_addr *addr; 972 int ifindex; 973 int scope; 974 int label; 975 unsigned int prefs; 976 }; 977 978 static inline int ipv6_saddr_preferred(int type) 979 { 980 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 981 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 982 return 1; 983 return 0; 984 } 985 986 static int ipv6_get_saddr_eval(struct net *net, 987 struct ipv6_saddr_score *score, 988 struct ipv6_saddr_dst *dst, 989 int i) 990 { 991 int ret; 992 993 if (i <= score->rule) { 994 switch (i) { 995 case IPV6_SADDR_RULE_SCOPE: 996 ret = score->scopedist; 997 break; 998 case IPV6_SADDR_RULE_PREFIX: 999 ret = score->matchlen; 1000 break; 1001 default: 1002 ret = !!test_bit(i, score->scorebits); 1003 } 1004 goto out; 1005 } 1006 1007 switch (i) { 1008 case IPV6_SADDR_RULE_INIT: 1009 /* Rule 0: remember if hiscore is not ready yet */ 1010 ret = !!score->ifa; 1011 break; 1012 case IPV6_SADDR_RULE_LOCAL: 1013 /* Rule 1: Prefer same address */ 1014 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1015 break; 1016 case IPV6_SADDR_RULE_SCOPE: 1017 /* Rule 2: Prefer appropriate scope 1018 * 1019 * ret 1020 * ^ 1021 * -1 | d 15 1022 * ---+--+-+---> scope 1023 * | 1024 * | d is scope of the destination. 1025 * B-d | \ 1026 * | \ <- smaller scope is better if 1027 * B-15 | \ if scope is enough for destinaion. 1028 * | ret = B - scope (-1 <= scope >= d <= 15). 1029 * d-C-1 | / 1030 * |/ <- greater is better 1031 * -C / if scope is not enough for destination. 1032 * /| ret = scope - C (-1 <= d < scope <= 15). 1033 * 1034 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1035 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1036 * Assume B = 0 and we get C > 29. 1037 */ 1038 ret = __ipv6_addr_src_scope(score->addr_type); 1039 if (ret >= dst->scope) 1040 ret = -ret; 1041 else 1042 ret -= 128; /* 30 is enough */ 1043 score->scopedist = ret; 1044 break; 1045 case IPV6_SADDR_RULE_PREFERRED: 1046 /* Rule 3: Avoid deprecated and optimistic addresses */ 1047 ret = ipv6_saddr_preferred(score->addr_type) || 1048 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1049 break; 1050 #ifdef CONFIG_IPV6_MIP6 1051 case IPV6_SADDR_RULE_HOA: 1052 { 1053 /* Rule 4: Prefer home address */ 1054 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1055 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1056 break; 1057 } 1058 #endif 1059 case IPV6_SADDR_RULE_OIF: 1060 /* Rule 5: Prefer outgoing interface */ 1061 ret = (!dst->ifindex || 1062 dst->ifindex == score->ifa->idev->dev->ifindex); 1063 break; 1064 case IPV6_SADDR_RULE_LABEL: 1065 /* Rule 6: Prefer matching label */ 1066 ret = ipv6_addr_label(net, 1067 &score->ifa->addr, score->addr_type, 1068 score->ifa->idev->dev->ifindex) == dst->label; 1069 break; 1070 #ifdef CONFIG_IPV6_PRIVACY 1071 case IPV6_SADDR_RULE_PRIVACY: 1072 { 1073 /* Rule 7: Prefer public address 1074 * Note: prefer temprary address if use_tempaddr >= 2 1075 */ 1076 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1077 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1078 score->ifa->idev->cnf.use_tempaddr >= 2; 1079 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1080 break; 1081 } 1082 #endif 1083 case IPV6_SADDR_RULE_ORCHID: 1084 /* Rule 8-: Prefer ORCHID vs ORCHID or 1085 * non-ORCHID vs non-ORCHID 1086 */ 1087 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1088 ipv6_addr_orchid(dst->addr)); 1089 break; 1090 case IPV6_SADDR_RULE_PREFIX: 1091 /* Rule 8: Use longest matching prefix */ 1092 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1093 dst->addr); 1094 break; 1095 default: 1096 ret = 0; 1097 } 1098 1099 if (ret) 1100 __set_bit(i, score->scorebits); 1101 score->rule = i; 1102 out: 1103 return ret; 1104 } 1105 1106 int ipv6_dev_get_saddr(struct net_device *dst_dev, 1107 const struct in6_addr *daddr, unsigned int prefs, 1108 struct in6_addr *saddr) 1109 { 1110 struct ipv6_saddr_score scores[2], 1111 *score = &scores[0], *hiscore = &scores[1]; 1112 struct net *net = dev_net(dst_dev); 1113 struct ipv6_saddr_dst dst; 1114 struct net_device *dev; 1115 int dst_type; 1116 1117 dst_type = __ipv6_addr_type(daddr); 1118 dst.addr = daddr; 1119 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1120 dst.scope = __ipv6_addr_src_scope(dst_type); 1121 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1122 dst.prefs = prefs; 1123 1124 hiscore->rule = -1; 1125 hiscore->ifa = NULL; 1126 1127 read_lock(&dev_base_lock); 1128 rcu_read_lock(); 1129 1130 for_each_netdev(net, dev) { 1131 struct inet6_dev *idev; 1132 1133 /* Candidate Source Address (section 4) 1134 * - multicast and link-local destination address, 1135 * the set of candidate source address MUST only 1136 * include addresses assigned to interfaces 1137 * belonging to the same link as the outgoing 1138 * interface. 1139 * (- For site-local destination addresses, the 1140 * set of candidate source addresses MUST only 1141 * include addresses assigned to interfaces 1142 * belonging to the same site as the outgoing 1143 * interface.) 1144 */ 1145 if (((dst_type & IPV6_ADDR_MULTICAST) || 1146 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1147 dst.ifindex && dev->ifindex != dst.ifindex) 1148 continue; 1149 1150 idev = __in6_dev_get(dev); 1151 if (!idev) 1152 continue; 1153 1154 read_lock_bh(&idev->lock); 1155 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1156 int i; 1157 1158 /* 1159 * - Tentative Address (RFC2462 section 5.4) 1160 * - A tentative address is not considered 1161 * "assigned to an interface" in the traditional 1162 * sense, unless it is also flagged as optimistic. 1163 * - Candidate Source Address (section 4) 1164 * - In any case, anycast addresses, multicast 1165 * addresses, and the unspecified address MUST 1166 * NOT be included in a candidate set. 1167 */ 1168 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1169 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1170 continue; 1171 1172 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1173 1174 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1175 score->addr_type & IPV6_ADDR_MULTICAST)) { 1176 LIMIT_NETDEBUG(KERN_DEBUG 1177 "ADDRCONF: unspecified / multicast address " 1178 "assigned as unicast address on %s", 1179 dev->name); 1180 continue; 1181 } 1182 1183 score->rule = -1; 1184 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1185 1186 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1187 int minihiscore, miniscore; 1188 1189 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1190 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1191 1192 if (minihiscore > miniscore) { 1193 if (i == IPV6_SADDR_RULE_SCOPE && 1194 score->scopedist > 0) { 1195 /* 1196 * special case: 1197 * each remaining entry 1198 * has too small (not enough) 1199 * scope, because ifa entries 1200 * are sorted by their scope 1201 * values. 1202 */ 1203 goto try_nextdev; 1204 } 1205 break; 1206 } else if (minihiscore < miniscore) { 1207 struct ipv6_saddr_score *tmp; 1208 1209 if (hiscore->ifa) 1210 in6_ifa_put(hiscore->ifa); 1211 1212 in6_ifa_hold(score->ifa); 1213 1214 tmp = hiscore; 1215 hiscore = score; 1216 score = tmp; 1217 1218 /* restore our iterator */ 1219 score->ifa = hiscore->ifa; 1220 1221 break; 1222 } 1223 } 1224 } 1225 try_nextdev: 1226 read_unlock_bh(&idev->lock); 1227 } 1228 rcu_read_unlock(); 1229 read_unlock(&dev_base_lock); 1230 1231 if (!hiscore->ifa) 1232 return -EADDRNOTAVAIL; 1233 1234 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1235 in6_ifa_put(hiscore->ifa); 1236 return 0; 1237 } 1238 1239 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1240 1241 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1242 unsigned char banned_flags) 1243 { 1244 struct inet6_dev *idev; 1245 int err = -EADDRNOTAVAIL; 1246 1247 rcu_read_lock(); 1248 if ((idev = __in6_dev_get(dev)) != NULL) { 1249 struct inet6_ifaddr *ifp; 1250 1251 read_lock_bh(&idev->lock); 1252 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1253 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1254 ipv6_addr_copy(addr, &ifp->addr); 1255 err = 0; 1256 break; 1257 } 1258 } 1259 read_unlock_bh(&idev->lock); 1260 } 1261 rcu_read_unlock(); 1262 return err; 1263 } 1264 1265 static int ipv6_count_addresses(struct inet6_dev *idev) 1266 { 1267 int cnt = 0; 1268 struct inet6_ifaddr *ifp; 1269 1270 read_lock_bh(&idev->lock); 1271 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1272 cnt++; 1273 read_unlock_bh(&idev->lock); 1274 return cnt; 1275 } 1276 1277 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1278 struct net_device *dev, int strict) 1279 { 1280 struct inet6_ifaddr * ifp; 1281 u8 hash = ipv6_addr_hash(addr); 1282 1283 read_lock_bh(&addrconf_hash_lock); 1284 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1285 if (!net_eq(dev_net(ifp->idev->dev), net)) 1286 continue; 1287 if (ipv6_addr_equal(&ifp->addr, addr) && 1288 !(ifp->flags&IFA_F_TENTATIVE)) { 1289 if (dev == NULL || ifp->idev->dev == dev || 1290 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1291 break; 1292 } 1293 } 1294 read_unlock_bh(&addrconf_hash_lock); 1295 return ifp != NULL; 1296 } 1297 EXPORT_SYMBOL(ipv6_chk_addr); 1298 1299 static 1300 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1301 struct net_device *dev) 1302 { 1303 struct inet6_ifaddr * ifp; 1304 u8 hash = ipv6_addr_hash(addr); 1305 1306 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1307 if (!net_eq(dev_net(ifp->idev->dev), net)) 1308 continue; 1309 if (ipv6_addr_equal(&ifp->addr, addr)) { 1310 if (dev == NULL || ifp->idev->dev == dev) 1311 break; 1312 } 1313 } 1314 return ifp != NULL; 1315 } 1316 1317 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1318 { 1319 struct inet6_dev *idev; 1320 struct inet6_ifaddr *ifa; 1321 int onlink; 1322 1323 onlink = 0; 1324 rcu_read_lock(); 1325 idev = __in6_dev_get(dev); 1326 if (idev) { 1327 read_lock_bh(&idev->lock); 1328 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 1329 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1330 ifa->prefix_len); 1331 if (onlink) 1332 break; 1333 } 1334 read_unlock_bh(&idev->lock); 1335 } 1336 rcu_read_unlock(); 1337 return onlink; 1338 } 1339 1340 EXPORT_SYMBOL(ipv6_chk_prefix); 1341 1342 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1343 struct net_device *dev, int strict) 1344 { 1345 struct inet6_ifaddr * ifp; 1346 u8 hash = ipv6_addr_hash(addr); 1347 1348 read_lock_bh(&addrconf_hash_lock); 1349 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1350 if (!net_eq(dev_net(ifp->idev->dev), net)) 1351 continue; 1352 if (ipv6_addr_equal(&ifp->addr, addr)) { 1353 if (dev == NULL || ifp->idev->dev == dev || 1354 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1355 in6_ifa_hold(ifp); 1356 break; 1357 } 1358 } 1359 } 1360 read_unlock_bh(&addrconf_hash_lock); 1361 1362 return ifp; 1363 } 1364 1365 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1366 { 1367 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1368 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1369 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1370 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1371 int sk_ipv6only = ipv6_only_sock(sk); 1372 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1373 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1374 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1375 1376 if (!sk2_rcv_saddr && !sk_ipv6only) 1377 return 1; 1378 1379 if (addr_type2 == IPV6_ADDR_ANY && 1380 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1381 return 1; 1382 1383 if (addr_type == IPV6_ADDR_ANY && 1384 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1385 return 1; 1386 1387 if (sk2_rcv_saddr6 && 1388 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1389 return 1; 1390 1391 if (addr_type == IPV6_ADDR_MAPPED && 1392 !sk2_ipv6only && 1393 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1394 return 1; 1395 1396 return 0; 1397 } 1398 1399 /* Gets referenced address, destroys ifaddr */ 1400 1401 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1402 { 1403 if (ifp->flags&IFA_F_PERMANENT) { 1404 spin_lock_bh(&ifp->lock); 1405 addrconf_del_timer(ifp); 1406 ifp->flags |= IFA_F_TENTATIVE; 1407 spin_unlock_bh(&ifp->lock); 1408 in6_ifa_put(ifp); 1409 #ifdef CONFIG_IPV6_PRIVACY 1410 } else if (ifp->flags&IFA_F_TEMPORARY) { 1411 struct inet6_ifaddr *ifpub; 1412 spin_lock_bh(&ifp->lock); 1413 ifpub = ifp->ifpub; 1414 if (ifpub) { 1415 in6_ifa_hold(ifpub); 1416 spin_unlock_bh(&ifp->lock); 1417 ipv6_create_tempaddr(ifpub, ifp); 1418 in6_ifa_put(ifpub); 1419 } else { 1420 spin_unlock_bh(&ifp->lock); 1421 } 1422 ipv6_del_addr(ifp); 1423 #endif 1424 } else 1425 ipv6_del_addr(ifp); 1426 } 1427 1428 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1429 { 1430 struct inet6_dev *idev = ifp->idev; 1431 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1432 struct in6_addr addr; 1433 1434 addr.s6_addr32[0] = htonl(0xfe800000); 1435 addr.s6_addr32[1] = 0; 1436 1437 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1438 ipv6_addr_equal(&ifp->addr, &addr)) { 1439 /* DAD failed for link-local based on MAC address */ 1440 idev->cnf.disable_ipv6 = 1; 1441 } 1442 } 1443 1444 if (net_ratelimit()) 1445 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1446 addrconf_dad_stop(ifp); 1447 } 1448 1449 /* Join to solicited addr multicast group. */ 1450 1451 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1452 { 1453 struct in6_addr maddr; 1454 1455 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1456 return; 1457 1458 addrconf_addr_solict_mult(addr, &maddr); 1459 ipv6_dev_mc_inc(dev, &maddr); 1460 } 1461 1462 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1463 { 1464 struct in6_addr maddr; 1465 1466 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1467 return; 1468 1469 addrconf_addr_solict_mult(addr, &maddr); 1470 __ipv6_dev_mc_dec(idev, &maddr); 1471 } 1472 1473 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1474 { 1475 struct in6_addr addr; 1476 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1477 if (ipv6_addr_any(&addr)) 1478 return; 1479 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1480 } 1481 1482 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1483 { 1484 struct in6_addr addr; 1485 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1486 if (ipv6_addr_any(&addr)) 1487 return; 1488 __ipv6_dev_ac_dec(ifp->idev, &addr); 1489 } 1490 1491 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1492 { 1493 if (dev->addr_len != ETH_ALEN) 1494 return -1; 1495 memcpy(eui, dev->dev_addr, 3); 1496 memcpy(eui + 5, dev->dev_addr + 3, 3); 1497 1498 /* 1499 * The zSeries OSA network cards can be shared among various 1500 * OS instances, but the OSA cards have only one MAC address. 1501 * This leads to duplicate address conflicts in conjunction 1502 * with IPv6 if more than one instance uses the same card. 1503 * 1504 * The driver for these cards can deliver a unique 16-bit 1505 * identifier for each instance sharing the same card. It is 1506 * placed instead of 0xFFFE in the interface identifier. The 1507 * "u" bit of the interface identifier is not inverted in this 1508 * case. Hence the resulting interface identifier has local 1509 * scope according to RFC2373. 1510 */ 1511 if (dev->dev_id) { 1512 eui[3] = (dev->dev_id >> 8) & 0xFF; 1513 eui[4] = dev->dev_id & 0xFF; 1514 } else { 1515 eui[3] = 0xFF; 1516 eui[4] = 0xFE; 1517 eui[0] ^= 2; 1518 } 1519 return 0; 1520 } 1521 1522 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1523 { 1524 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1525 if (dev->addr_len != ARCNET_ALEN) 1526 return -1; 1527 memset(eui, 0, 7); 1528 eui[7] = *(u8*)dev->dev_addr; 1529 return 0; 1530 } 1531 1532 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1533 { 1534 if (dev->addr_len != INFINIBAND_ALEN) 1535 return -1; 1536 memcpy(eui, dev->dev_addr + 12, 8); 1537 eui[0] |= 2; 1538 return 0; 1539 } 1540 1541 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1542 { 1543 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1544 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1545 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1546 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1547 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1548 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1549 eui[1] = 0; 1550 eui[2] = 0x5E; 1551 eui[3] = 0xFE; 1552 memcpy(eui + 4, &addr, 4); 1553 return 0; 1554 } 1555 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1556 1557 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1558 { 1559 if (dev->priv_flags & IFF_ISATAP) 1560 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1561 return -1; 1562 } 1563 1564 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1565 { 1566 switch (dev->type) { 1567 case ARPHRD_ETHER: 1568 case ARPHRD_FDDI: 1569 case ARPHRD_IEEE802_TR: 1570 return addrconf_ifid_eui48(eui, dev); 1571 case ARPHRD_ARCNET: 1572 return addrconf_ifid_arcnet(eui, dev); 1573 case ARPHRD_INFINIBAND: 1574 return addrconf_ifid_infiniband(eui, dev); 1575 case ARPHRD_SIT: 1576 return addrconf_ifid_sit(eui, dev); 1577 } 1578 return -1; 1579 } 1580 1581 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1582 { 1583 int err = -1; 1584 struct inet6_ifaddr *ifp; 1585 1586 read_lock_bh(&idev->lock); 1587 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1588 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1589 memcpy(eui, ifp->addr.s6_addr+8, 8); 1590 err = 0; 1591 break; 1592 } 1593 } 1594 read_unlock_bh(&idev->lock); 1595 return err; 1596 } 1597 1598 #ifdef CONFIG_IPV6_PRIVACY 1599 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1600 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1601 { 1602 regen: 1603 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1604 idev->rndid[0] &= ~0x02; 1605 1606 /* 1607 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1608 * check if generated address is not inappropriate 1609 * 1610 * - Reserved subnet anycast (RFC 2526) 1611 * 11111101 11....11 1xxxxxxx 1612 * - ISATAP (RFC4214) 6.1 1613 * 00-00-5E-FE-xx-xx-xx-xx 1614 * - value 0 1615 * - XXX: already assigned to an address on the device 1616 */ 1617 if (idev->rndid[0] == 0xfd && 1618 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1619 (idev->rndid[7]&0x80)) 1620 goto regen; 1621 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1622 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1623 goto regen; 1624 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1625 goto regen; 1626 } 1627 1628 return 0; 1629 } 1630 1631 static void ipv6_regen_rndid(unsigned long data) 1632 { 1633 struct inet6_dev *idev = (struct inet6_dev *) data; 1634 unsigned long expires; 1635 1636 rcu_read_lock_bh(); 1637 write_lock_bh(&idev->lock); 1638 1639 if (idev->dead) 1640 goto out; 1641 1642 if (__ipv6_regen_rndid(idev) < 0) 1643 goto out; 1644 1645 expires = jiffies + 1646 idev->cnf.temp_prefered_lft * HZ - 1647 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1648 if (time_before(expires, jiffies)) { 1649 printk(KERN_WARNING 1650 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1651 idev->dev->name); 1652 goto out; 1653 } 1654 1655 if (!mod_timer(&idev->regen_timer, expires)) 1656 in6_dev_hold(idev); 1657 1658 out: 1659 write_unlock_bh(&idev->lock); 1660 rcu_read_unlock_bh(); 1661 in6_dev_put(idev); 1662 } 1663 1664 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1665 int ret = 0; 1666 1667 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1668 ret = __ipv6_regen_rndid(idev); 1669 return ret; 1670 } 1671 #endif 1672 1673 /* 1674 * Add prefix route. 1675 */ 1676 1677 static void 1678 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1679 unsigned long expires, u32 flags) 1680 { 1681 struct fib6_config cfg = { 1682 .fc_table = RT6_TABLE_PREFIX, 1683 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1684 .fc_ifindex = dev->ifindex, 1685 .fc_expires = expires, 1686 .fc_dst_len = plen, 1687 .fc_flags = RTF_UP | flags, 1688 .fc_nlinfo.nl_net = dev_net(dev), 1689 }; 1690 1691 ipv6_addr_copy(&cfg.fc_dst, pfx); 1692 1693 /* Prevent useless cloning on PtP SIT. 1694 This thing is done here expecting that the whole 1695 class of non-broadcast devices need not cloning. 1696 */ 1697 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1698 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1699 cfg.fc_flags |= RTF_NONEXTHOP; 1700 #endif 1701 1702 ip6_route_add(&cfg); 1703 } 1704 1705 /* Create "default" multicast route to the interface */ 1706 1707 static void addrconf_add_mroute(struct net_device *dev) 1708 { 1709 struct fib6_config cfg = { 1710 .fc_table = RT6_TABLE_LOCAL, 1711 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1712 .fc_ifindex = dev->ifindex, 1713 .fc_dst_len = 8, 1714 .fc_flags = RTF_UP, 1715 .fc_nlinfo.nl_net = dev_net(dev), 1716 }; 1717 1718 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1719 1720 ip6_route_add(&cfg); 1721 } 1722 1723 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1724 static void sit_route_add(struct net_device *dev) 1725 { 1726 struct fib6_config cfg = { 1727 .fc_table = RT6_TABLE_MAIN, 1728 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1729 .fc_ifindex = dev->ifindex, 1730 .fc_dst_len = 96, 1731 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1732 .fc_nlinfo.nl_net = dev_net(dev), 1733 }; 1734 1735 /* prefix length - 96 bits "::d.d.d.d" */ 1736 ip6_route_add(&cfg); 1737 } 1738 #endif 1739 1740 static void addrconf_add_lroute(struct net_device *dev) 1741 { 1742 struct in6_addr addr; 1743 1744 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1745 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1746 } 1747 1748 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1749 { 1750 struct inet6_dev *idev; 1751 1752 ASSERT_RTNL(); 1753 1754 if ((idev = ipv6_find_idev(dev)) == NULL) 1755 return NULL; 1756 1757 /* Add default multicast route */ 1758 addrconf_add_mroute(dev); 1759 1760 /* Add link local route */ 1761 addrconf_add_lroute(dev); 1762 return idev; 1763 } 1764 1765 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1766 { 1767 struct prefix_info *pinfo; 1768 __u32 valid_lft; 1769 __u32 prefered_lft; 1770 int addr_type; 1771 struct inet6_dev *in6_dev; 1772 1773 pinfo = (struct prefix_info *) opt; 1774 1775 if (len < sizeof(struct prefix_info)) { 1776 ADBG(("addrconf: prefix option too short\n")); 1777 return; 1778 } 1779 1780 /* 1781 * Validation checks ([ADDRCONF], page 19) 1782 */ 1783 1784 addr_type = ipv6_addr_type(&pinfo->prefix); 1785 1786 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1787 return; 1788 1789 valid_lft = ntohl(pinfo->valid); 1790 prefered_lft = ntohl(pinfo->prefered); 1791 1792 if (prefered_lft > valid_lft) { 1793 if (net_ratelimit()) 1794 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1795 return; 1796 } 1797 1798 in6_dev = in6_dev_get(dev); 1799 1800 if (in6_dev == NULL) { 1801 if (net_ratelimit()) 1802 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1803 return; 1804 } 1805 1806 /* 1807 * Two things going on here: 1808 * 1) Add routes for on-link prefixes 1809 * 2) Configure prefixes with the auto flag set 1810 */ 1811 1812 if (pinfo->onlink) { 1813 struct rt6_info *rt; 1814 unsigned long rt_expires; 1815 1816 /* Avoid arithmetic overflow. Really, we could 1817 * save rt_expires in seconds, likely valid_lft, 1818 * but it would require division in fib gc, that it 1819 * not good. 1820 */ 1821 if (HZ > USER_HZ) 1822 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1823 else 1824 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1825 1826 if (addrconf_finite_timeout(rt_expires)) 1827 rt_expires *= HZ; 1828 1829 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL, 1830 dev->ifindex, 1); 1831 1832 if (rt && addrconf_is_prefix_route(rt)) { 1833 /* Autoconf prefix route */ 1834 if (valid_lft == 0) { 1835 ip6_del_rt(rt); 1836 rt = NULL; 1837 } else if (addrconf_finite_timeout(rt_expires)) { 1838 /* not infinity */ 1839 rt->rt6i_expires = jiffies + rt_expires; 1840 rt->rt6i_flags |= RTF_EXPIRES; 1841 } else { 1842 rt->rt6i_flags &= ~RTF_EXPIRES; 1843 rt->rt6i_expires = 0; 1844 } 1845 } else if (valid_lft) { 1846 clock_t expires = 0; 1847 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1848 if (addrconf_finite_timeout(rt_expires)) { 1849 /* not infinity */ 1850 flags |= RTF_EXPIRES; 1851 expires = jiffies_to_clock_t(rt_expires); 1852 } 1853 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1854 dev, expires, flags); 1855 } 1856 if (rt) 1857 dst_release(&rt->u.dst); 1858 } 1859 1860 /* Try to figure out our local address for this prefix */ 1861 1862 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1863 struct inet6_ifaddr * ifp; 1864 struct in6_addr addr; 1865 int create = 0, update_lft = 0; 1866 struct net *net = dev_net(dev); 1867 1868 if (pinfo->prefix_len == 64) { 1869 memcpy(&addr, &pinfo->prefix, 8); 1870 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1871 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1872 in6_dev_put(in6_dev); 1873 return; 1874 } 1875 goto ok; 1876 } 1877 if (net_ratelimit()) 1878 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1879 pinfo->prefix_len); 1880 in6_dev_put(in6_dev); 1881 return; 1882 1883 ok: 1884 1885 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1886 1887 if (ifp == NULL && valid_lft) { 1888 int max_addresses = in6_dev->cnf.max_addresses; 1889 u32 addr_flags = 0; 1890 1891 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1892 if (in6_dev->cnf.optimistic_dad && 1893 !net->ipv6.devconf_all->forwarding) 1894 addr_flags = IFA_F_OPTIMISTIC; 1895 #endif 1896 1897 /* Do not allow to create too much of autoconfigured 1898 * addresses; this would be too easy way to crash kernel. 1899 */ 1900 if (!max_addresses || 1901 ipv6_count_addresses(in6_dev) < max_addresses) 1902 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1903 addr_type&IPV6_ADDR_SCOPE_MASK, 1904 addr_flags); 1905 1906 if (!ifp || IS_ERR(ifp)) { 1907 in6_dev_put(in6_dev); 1908 return; 1909 } 1910 1911 update_lft = create = 1; 1912 ifp->cstamp = jiffies; 1913 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1914 } 1915 1916 if (ifp) { 1917 int flags; 1918 unsigned long now; 1919 #ifdef CONFIG_IPV6_PRIVACY 1920 struct inet6_ifaddr *ift; 1921 #endif 1922 u32 stored_lft; 1923 1924 /* update lifetime (RFC2462 5.5.3 e) */ 1925 spin_lock(&ifp->lock); 1926 now = jiffies; 1927 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1928 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1929 else 1930 stored_lft = 0; 1931 if (!update_lft && stored_lft) { 1932 if (valid_lft > MIN_VALID_LIFETIME || 1933 valid_lft > stored_lft) 1934 update_lft = 1; 1935 else if (stored_lft <= MIN_VALID_LIFETIME) { 1936 /* valid_lft <= stored_lft is always true */ 1937 /* XXX: IPsec */ 1938 update_lft = 0; 1939 } else { 1940 valid_lft = MIN_VALID_LIFETIME; 1941 if (valid_lft < prefered_lft) 1942 prefered_lft = valid_lft; 1943 update_lft = 1; 1944 } 1945 } 1946 1947 if (update_lft) { 1948 ifp->valid_lft = valid_lft; 1949 ifp->prefered_lft = prefered_lft; 1950 ifp->tstamp = now; 1951 flags = ifp->flags; 1952 ifp->flags &= ~IFA_F_DEPRECATED; 1953 spin_unlock(&ifp->lock); 1954 1955 if (!(flags&IFA_F_TENTATIVE)) 1956 ipv6_ifa_notify(0, ifp); 1957 } else 1958 spin_unlock(&ifp->lock); 1959 1960 #ifdef CONFIG_IPV6_PRIVACY 1961 read_lock_bh(&in6_dev->lock); 1962 /* update all temporary addresses in the list */ 1963 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1964 /* 1965 * When adjusting the lifetimes of an existing 1966 * temporary address, only lower the lifetimes. 1967 * Implementations must not increase the 1968 * lifetimes of an existing temporary address 1969 * when processing a Prefix Information Option. 1970 */ 1971 if (ifp != ift->ifpub) 1972 continue; 1973 1974 spin_lock(&ift->lock); 1975 flags = ift->flags; 1976 if (ift->valid_lft > valid_lft && 1977 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1978 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1979 if (ift->prefered_lft > prefered_lft && 1980 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1981 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1982 spin_unlock(&ift->lock); 1983 if (!(flags&IFA_F_TENTATIVE)) 1984 ipv6_ifa_notify(0, ift); 1985 } 1986 1987 if (create && in6_dev->cnf.use_tempaddr > 0) { 1988 /* 1989 * When a new public address is created as described in [ADDRCONF], 1990 * also create a new temporary address. 1991 */ 1992 read_unlock_bh(&in6_dev->lock); 1993 ipv6_create_tempaddr(ifp, NULL); 1994 } else { 1995 read_unlock_bh(&in6_dev->lock); 1996 } 1997 #endif 1998 in6_ifa_put(ifp); 1999 addrconf_verify(0); 2000 } 2001 } 2002 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2003 in6_dev_put(in6_dev); 2004 } 2005 2006 /* 2007 * Set destination address. 2008 * Special case for SIT interfaces where we create a new "virtual" 2009 * device. 2010 */ 2011 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2012 { 2013 struct in6_ifreq ireq; 2014 struct net_device *dev; 2015 int err = -EINVAL; 2016 2017 rtnl_lock(); 2018 2019 err = -EFAULT; 2020 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2021 goto err_exit; 2022 2023 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2024 2025 err = -ENODEV; 2026 if (dev == NULL) 2027 goto err_exit; 2028 2029 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2030 if (dev->type == ARPHRD_SIT) { 2031 struct ifreq ifr; 2032 mm_segment_t oldfs; 2033 struct ip_tunnel_parm p; 2034 2035 err = -EADDRNOTAVAIL; 2036 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2037 goto err_exit; 2038 2039 memset(&p, 0, sizeof(p)); 2040 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2041 p.iph.saddr = 0; 2042 p.iph.version = 4; 2043 p.iph.ihl = 5; 2044 p.iph.protocol = IPPROTO_IPV6; 2045 p.iph.ttl = 64; 2046 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2047 2048 oldfs = get_fs(); set_fs(KERNEL_DS); 2049 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2050 set_fs(oldfs); 2051 2052 if (err == 0) { 2053 err = -ENOBUFS; 2054 dev = __dev_get_by_name(net, p.name); 2055 if (!dev) 2056 goto err_exit; 2057 err = dev_open(dev); 2058 } 2059 } 2060 #endif 2061 2062 err_exit: 2063 rtnl_unlock(); 2064 return err; 2065 } 2066 2067 /* 2068 * Manual configuration of address on an interface 2069 */ 2070 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2071 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2072 __u32 valid_lft) 2073 { 2074 struct inet6_ifaddr *ifp; 2075 struct inet6_dev *idev; 2076 struct net_device *dev; 2077 int scope; 2078 u32 flags; 2079 clock_t expires; 2080 unsigned long timeout; 2081 2082 ASSERT_RTNL(); 2083 2084 if (plen > 128) 2085 return -EINVAL; 2086 2087 /* check the lifetime */ 2088 if (!valid_lft || prefered_lft > valid_lft) 2089 return -EINVAL; 2090 2091 dev = __dev_get_by_index(net, ifindex); 2092 if (!dev) 2093 return -ENODEV; 2094 2095 if ((idev = addrconf_add_dev(dev)) == NULL) 2096 return -ENOBUFS; 2097 2098 scope = ipv6_addr_scope(pfx); 2099 2100 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2101 if (addrconf_finite_timeout(timeout)) { 2102 expires = jiffies_to_clock_t(timeout * HZ); 2103 valid_lft = timeout; 2104 flags = RTF_EXPIRES; 2105 } else { 2106 expires = 0; 2107 flags = 0; 2108 ifa_flags |= IFA_F_PERMANENT; 2109 } 2110 2111 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2112 if (addrconf_finite_timeout(timeout)) { 2113 if (timeout == 0) 2114 ifa_flags |= IFA_F_DEPRECATED; 2115 prefered_lft = timeout; 2116 } 2117 2118 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2119 2120 if (!IS_ERR(ifp)) { 2121 spin_lock_bh(&ifp->lock); 2122 ifp->valid_lft = valid_lft; 2123 ifp->prefered_lft = prefered_lft; 2124 ifp->tstamp = jiffies; 2125 spin_unlock_bh(&ifp->lock); 2126 2127 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2128 expires, flags); 2129 /* 2130 * Note that section 3.1 of RFC 4429 indicates 2131 * that the Optimistic flag should not be set for 2132 * manually configured addresses 2133 */ 2134 addrconf_dad_start(ifp, 0); 2135 in6_ifa_put(ifp); 2136 addrconf_verify(0); 2137 return 0; 2138 } 2139 2140 return PTR_ERR(ifp); 2141 } 2142 2143 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2144 unsigned int plen) 2145 { 2146 struct inet6_ifaddr *ifp; 2147 struct inet6_dev *idev; 2148 struct net_device *dev; 2149 2150 if (plen > 128) 2151 return -EINVAL; 2152 2153 dev = __dev_get_by_index(net, ifindex); 2154 if (!dev) 2155 return -ENODEV; 2156 2157 if ((idev = __in6_dev_get(dev)) == NULL) 2158 return -ENXIO; 2159 2160 read_lock_bh(&idev->lock); 2161 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2162 if (ifp->prefix_len == plen && 2163 ipv6_addr_equal(pfx, &ifp->addr)) { 2164 in6_ifa_hold(ifp); 2165 read_unlock_bh(&idev->lock); 2166 2167 ipv6_del_addr(ifp); 2168 2169 /* If the last address is deleted administratively, 2170 disable IPv6 on this interface. 2171 */ 2172 if (idev->addr_list == NULL) 2173 addrconf_ifdown(idev->dev, 1); 2174 return 0; 2175 } 2176 } 2177 read_unlock_bh(&idev->lock); 2178 return -EADDRNOTAVAIL; 2179 } 2180 2181 2182 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2183 { 2184 struct in6_ifreq ireq; 2185 int err; 2186 2187 if (!capable(CAP_NET_ADMIN)) 2188 return -EPERM; 2189 2190 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2191 return -EFAULT; 2192 2193 rtnl_lock(); 2194 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2195 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2196 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2197 rtnl_unlock(); 2198 return err; 2199 } 2200 2201 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2202 { 2203 struct in6_ifreq ireq; 2204 int err; 2205 2206 if (!capable(CAP_NET_ADMIN)) 2207 return -EPERM; 2208 2209 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2210 return -EFAULT; 2211 2212 rtnl_lock(); 2213 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2214 ireq.ifr6_prefixlen); 2215 rtnl_unlock(); 2216 return err; 2217 } 2218 2219 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2220 static void sit_add_v4_addrs(struct inet6_dev *idev) 2221 { 2222 struct inet6_ifaddr * ifp; 2223 struct in6_addr addr; 2224 struct net_device *dev; 2225 struct net *net = dev_net(idev->dev); 2226 int scope; 2227 2228 ASSERT_RTNL(); 2229 2230 memset(&addr, 0, sizeof(struct in6_addr)); 2231 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2232 2233 if (idev->dev->flags&IFF_POINTOPOINT) { 2234 addr.s6_addr32[0] = htonl(0xfe800000); 2235 scope = IFA_LINK; 2236 } else { 2237 scope = IPV6_ADDR_COMPATv4; 2238 } 2239 2240 if (addr.s6_addr32[3]) { 2241 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2242 if (!IS_ERR(ifp)) { 2243 spin_lock_bh(&ifp->lock); 2244 ifp->flags &= ~IFA_F_TENTATIVE; 2245 spin_unlock_bh(&ifp->lock); 2246 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2247 in6_ifa_put(ifp); 2248 } 2249 return; 2250 } 2251 2252 for_each_netdev(net, dev) { 2253 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2254 if (in_dev && (dev->flags & IFF_UP)) { 2255 struct in_ifaddr * ifa; 2256 2257 int flag = scope; 2258 2259 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2260 int plen; 2261 2262 addr.s6_addr32[3] = ifa->ifa_local; 2263 2264 if (ifa->ifa_scope == RT_SCOPE_LINK) 2265 continue; 2266 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2267 if (idev->dev->flags&IFF_POINTOPOINT) 2268 continue; 2269 flag |= IFA_HOST; 2270 } 2271 if (idev->dev->flags&IFF_POINTOPOINT) 2272 plen = 64; 2273 else 2274 plen = 96; 2275 2276 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2277 IFA_F_PERMANENT); 2278 if (!IS_ERR(ifp)) { 2279 spin_lock_bh(&ifp->lock); 2280 ifp->flags &= ~IFA_F_TENTATIVE; 2281 spin_unlock_bh(&ifp->lock); 2282 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2283 in6_ifa_put(ifp); 2284 } 2285 } 2286 } 2287 } 2288 } 2289 #endif 2290 2291 static void init_loopback(struct net_device *dev) 2292 { 2293 struct inet6_dev *idev; 2294 struct inet6_ifaddr * ifp; 2295 2296 /* ::1 */ 2297 2298 ASSERT_RTNL(); 2299 2300 if ((idev = ipv6_find_idev(dev)) == NULL) { 2301 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2302 return; 2303 } 2304 2305 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2306 if (!IS_ERR(ifp)) { 2307 spin_lock_bh(&ifp->lock); 2308 ifp->flags &= ~IFA_F_TENTATIVE; 2309 spin_unlock_bh(&ifp->lock); 2310 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2311 in6_ifa_put(ifp); 2312 } 2313 } 2314 2315 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2316 { 2317 struct inet6_ifaddr * ifp; 2318 u32 addr_flags = IFA_F_PERMANENT; 2319 2320 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2321 if (idev->cnf.optimistic_dad && 2322 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2323 addr_flags |= IFA_F_OPTIMISTIC; 2324 #endif 2325 2326 2327 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2328 if (!IS_ERR(ifp)) { 2329 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2330 addrconf_dad_start(ifp, 0); 2331 in6_ifa_put(ifp); 2332 } 2333 } 2334 2335 static void addrconf_dev_config(struct net_device *dev) 2336 { 2337 struct in6_addr addr; 2338 struct inet6_dev * idev; 2339 2340 ASSERT_RTNL(); 2341 2342 if ((dev->type != ARPHRD_ETHER) && 2343 (dev->type != ARPHRD_FDDI) && 2344 (dev->type != ARPHRD_IEEE802_TR) && 2345 (dev->type != ARPHRD_ARCNET) && 2346 (dev->type != ARPHRD_INFINIBAND)) { 2347 /* Alas, we support only Ethernet autoconfiguration. */ 2348 return; 2349 } 2350 2351 idev = addrconf_add_dev(dev); 2352 if (idev == NULL) 2353 return; 2354 2355 memset(&addr, 0, sizeof(struct in6_addr)); 2356 addr.s6_addr32[0] = htonl(0xFE800000); 2357 2358 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2359 addrconf_add_linklocal(idev, &addr); 2360 } 2361 2362 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2363 static void addrconf_sit_config(struct net_device *dev) 2364 { 2365 struct inet6_dev *idev; 2366 2367 ASSERT_RTNL(); 2368 2369 /* 2370 * Configure the tunnel with one of our IPv4 2371 * addresses... we should configure all of 2372 * our v4 addrs in the tunnel 2373 */ 2374 2375 if ((idev = ipv6_find_idev(dev)) == NULL) { 2376 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2377 return; 2378 } 2379 2380 if (dev->priv_flags & IFF_ISATAP) { 2381 struct in6_addr addr; 2382 2383 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2384 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2385 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2386 addrconf_add_linklocal(idev, &addr); 2387 return; 2388 } 2389 2390 sit_add_v4_addrs(idev); 2391 2392 if (dev->flags&IFF_POINTOPOINT) { 2393 addrconf_add_mroute(dev); 2394 addrconf_add_lroute(dev); 2395 } else 2396 sit_route_add(dev); 2397 } 2398 #endif 2399 2400 static inline int 2401 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2402 { 2403 struct in6_addr lladdr; 2404 2405 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2406 addrconf_add_linklocal(idev, &lladdr); 2407 return 0; 2408 } 2409 return -1; 2410 } 2411 2412 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2413 { 2414 struct net_device *link_dev; 2415 struct net *net = dev_net(idev->dev); 2416 2417 /* first try to inherit the link-local address from the link device */ 2418 if (idev->dev->iflink && 2419 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2420 if (!ipv6_inherit_linklocal(idev, link_dev)) 2421 return; 2422 } 2423 /* then try to inherit it from any device */ 2424 for_each_netdev(net, link_dev) { 2425 if (!ipv6_inherit_linklocal(idev, link_dev)) 2426 return; 2427 } 2428 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2429 } 2430 2431 /* 2432 * Autoconfigure tunnel with a link-local address so routing protocols, 2433 * DHCPv6, MLD etc. can be run over the virtual link 2434 */ 2435 2436 static void addrconf_ip6_tnl_config(struct net_device *dev) 2437 { 2438 struct inet6_dev *idev; 2439 2440 ASSERT_RTNL(); 2441 2442 if ((idev = addrconf_add_dev(dev)) == NULL) { 2443 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2444 return; 2445 } 2446 ip6_tnl_add_linklocal(idev); 2447 } 2448 2449 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2450 void * data) 2451 { 2452 struct net_device *dev = (struct net_device *) data; 2453 struct inet6_dev *idev = __in6_dev_get(dev); 2454 int run_pending = 0; 2455 int err; 2456 2457 switch(event) { 2458 case NETDEV_REGISTER: 2459 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2460 idev = ipv6_add_dev(dev); 2461 if (!idev) 2462 return notifier_from_errno(-ENOMEM); 2463 } 2464 break; 2465 case NETDEV_UP: 2466 case NETDEV_CHANGE: 2467 if (dev->flags & IFF_SLAVE) 2468 break; 2469 2470 if (event == NETDEV_UP) { 2471 if (!addrconf_qdisc_ok(dev)) { 2472 /* device is not ready yet. */ 2473 printk(KERN_INFO 2474 "ADDRCONF(NETDEV_UP): %s: " 2475 "link is not ready\n", 2476 dev->name); 2477 break; 2478 } 2479 2480 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2481 idev = ipv6_add_dev(dev); 2482 2483 if (idev) 2484 idev->if_flags |= IF_READY; 2485 } else { 2486 if (!addrconf_qdisc_ok(dev)) { 2487 /* device is still not ready. */ 2488 break; 2489 } 2490 2491 if (idev) { 2492 if (idev->if_flags & IF_READY) { 2493 /* device is already configured. */ 2494 break; 2495 } 2496 idev->if_flags |= IF_READY; 2497 } 2498 2499 printk(KERN_INFO 2500 "ADDRCONF(NETDEV_CHANGE): %s: " 2501 "link becomes ready\n", 2502 dev->name); 2503 2504 run_pending = 1; 2505 } 2506 2507 switch(dev->type) { 2508 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2509 case ARPHRD_SIT: 2510 addrconf_sit_config(dev); 2511 break; 2512 #endif 2513 case ARPHRD_TUNNEL6: 2514 addrconf_ip6_tnl_config(dev); 2515 break; 2516 case ARPHRD_LOOPBACK: 2517 init_loopback(dev); 2518 break; 2519 2520 default: 2521 addrconf_dev_config(dev); 2522 break; 2523 } 2524 if (idev) { 2525 if (run_pending) 2526 addrconf_dad_run(idev); 2527 2528 /* If the MTU changed during the interface down, when the 2529 interface up, the changed MTU must be reflected in the 2530 idev as well as routers. 2531 */ 2532 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2533 rt6_mtu_change(dev, dev->mtu); 2534 idev->cnf.mtu6 = dev->mtu; 2535 } 2536 idev->tstamp = jiffies; 2537 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2538 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2539 stop IPv6 on this interface. 2540 */ 2541 if (dev->mtu < IPV6_MIN_MTU) 2542 addrconf_ifdown(dev, event != NETDEV_DOWN); 2543 } 2544 break; 2545 2546 case NETDEV_CHANGEMTU: 2547 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2548 rt6_mtu_change(dev, dev->mtu); 2549 idev->cnf.mtu6 = dev->mtu; 2550 break; 2551 } 2552 2553 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2554 idev = ipv6_add_dev(dev); 2555 if (idev) 2556 break; 2557 } 2558 2559 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2560 2561 case NETDEV_DOWN: 2562 case NETDEV_UNREGISTER: 2563 /* 2564 * Remove all addresses from this interface. 2565 */ 2566 addrconf_ifdown(dev, event != NETDEV_DOWN); 2567 break; 2568 2569 case NETDEV_CHANGENAME: 2570 if (idev) { 2571 snmp6_unregister_dev(idev); 2572 addrconf_sysctl_unregister(idev); 2573 addrconf_sysctl_register(idev); 2574 err = snmp6_register_dev(idev); 2575 if (err) 2576 return notifier_from_errno(err); 2577 } 2578 break; 2579 } 2580 2581 return NOTIFY_OK; 2582 } 2583 2584 /* 2585 * addrconf module should be notified of a device going up 2586 */ 2587 static struct notifier_block ipv6_dev_notf = { 2588 .notifier_call = addrconf_notify, 2589 .priority = 0 2590 }; 2591 2592 static int addrconf_ifdown(struct net_device *dev, int how) 2593 { 2594 struct inet6_dev *idev; 2595 struct inet6_ifaddr *ifa, **bifa; 2596 struct net *net = dev_net(dev); 2597 int i; 2598 2599 ASSERT_RTNL(); 2600 2601 if ((dev->flags & IFF_LOOPBACK) && how == 1) 2602 how = 0; 2603 2604 rt6_ifdown(net, dev); 2605 neigh_ifdown(&nd_tbl, dev); 2606 2607 idev = __in6_dev_get(dev); 2608 if (idev == NULL) 2609 return -ENODEV; 2610 2611 /* Step 1: remove reference to ipv6 device from parent device. 2612 Do not dev_put! 2613 */ 2614 if (how) { 2615 idev->dead = 1; 2616 2617 /* protected by rtnl_lock */ 2618 rcu_assign_pointer(dev->ip6_ptr, NULL); 2619 2620 /* Step 1.5: remove snmp6 entry */ 2621 snmp6_unregister_dev(idev); 2622 2623 } 2624 2625 /* Step 2: clear hash table */ 2626 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2627 bifa = &inet6_addr_lst[i]; 2628 2629 write_lock_bh(&addrconf_hash_lock); 2630 while ((ifa = *bifa) != NULL) { 2631 if (ifa->idev == idev) { 2632 *bifa = ifa->lst_next; 2633 ifa->lst_next = NULL; 2634 addrconf_del_timer(ifa); 2635 in6_ifa_put(ifa); 2636 continue; 2637 } 2638 bifa = &ifa->lst_next; 2639 } 2640 write_unlock_bh(&addrconf_hash_lock); 2641 } 2642 2643 write_lock_bh(&idev->lock); 2644 2645 /* Step 3: clear flags for stateless addrconf */ 2646 if (!how) 2647 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2648 2649 /* Step 4: clear address list */ 2650 #ifdef CONFIG_IPV6_PRIVACY 2651 if (how && del_timer(&idev->regen_timer)) 2652 in6_dev_put(idev); 2653 2654 /* clear tempaddr list */ 2655 while ((ifa = idev->tempaddr_list) != NULL) { 2656 idev->tempaddr_list = ifa->tmp_next; 2657 ifa->tmp_next = NULL; 2658 ifa->dead = 1; 2659 write_unlock_bh(&idev->lock); 2660 spin_lock_bh(&ifa->lock); 2661 2662 if (ifa->ifpub) { 2663 in6_ifa_put(ifa->ifpub); 2664 ifa->ifpub = NULL; 2665 } 2666 spin_unlock_bh(&ifa->lock); 2667 in6_ifa_put(ifa); 2668 write_lock_bh(&idev->lock); 2669 } 2670 #endif 2671 while ((ifa = idev->addr_list) != NULL) { 2672 idev->addr_list = ifa->if_next; 2673 ifa->if_next = NULL; 2674 ifa->dead = 1; 2675 addrconf_del_timer(ifa); 2676 write_unlock_bh(&idev->lock); 2677 2678 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2679 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2680 in6_ifa_put(ifa); 2681 2682 write_lock_bh(&idev->lock); 2683 } 2684 write_unlock_bh(&idev->lock); 2685 2686 /* Step 5: Discard multicast list */ 2687 2688 if (how) 2689 ipv6_mc_destroy_dev(idev); 2690 else 2691 ipv6_mc_down(idev); 2692 2693 idev->tstamp = jiffies; 2694 2695 /* Shot the device (if unregistered) */ 2696 2697 if (how) { 2698 addrconf_sysctl_unregister(idev); 2699 neigh_parms_release(&nd_tbl, idev->nd_parms); 2700 neigh_ifdown(&nd_tbl, dev); 2701 in6_dev_put(idev); 2702 } 2703 return 0; 2704 } 2705 2706 static void addrconf_rs_timer(unsigned long data) 2707 { 2708 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2709 2710 if (ifp->idev->cnf.forwarding) 2711 goto out; 2712 2713 if (ifp->idev->if_flags & IF_RA_RCVD) { 2714 /* 2715 * Announcement received after solicitation 2716 * was sent 2717 */ 2718 goto out; 2719 } 2720 2721 spin_lock(&ifp->lock); 2722 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2723 /* The wait after the last probe can be shorter */ 2724 addrconf_mod_timer(ifp, AC_RS, 2725 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2726 ifp->idev->cnf.rtr_solicit_delay : 2727 ifp->idev->cnf.rtr_solicit_interval); 2728 spin_unlock(&ifp->lock); 2729 2730 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2731 } else { 2732 spin_unlock(&ifp->lock); 2733 /* 2734 * Note: we do not support deprecated "all on-link" 2735 * assumption any longer. 2736 */ 2737 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2738 ifp->idev->dev->name); 2739 } 2740 2741 out: 2742 in6_ifa_put(ifp); 2743 } 2744 2745 /* 2746 * Duplicate Address Detection 2747 */ 2748 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2749 { 2750 unsigned long rand_num; 2751 struct inet6_dev *idev = ifp->idev; 2752 2753 if (ifp->flags & IFA_F_OPTIMISTIC) 2754 rand_num = 0; 2755 else 2756 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2757 2758 ifp->probes = idev->cnf.dad_transmits; 2759 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2760 } 2761 2762 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2763 { 2764 struct inet6_dev *idev = ifp->idev; 2765 struct net_device *dev = idev->dev; 2766 2767 addrconf_join_solict(dev, &ifp->addr); 2768 2769 net_srandom(ifp->addr.s6_addr32[3]); 2770 2771 read_lock_bh(&idev->lock); 2772 if (ifp->dead) 2773 goto out; 2774 spin_lock_bh(&ifp->lock); 2775 2776 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2777 idev->cnf.accept_dad < 1 || 2778 !(ifp->flags&IFA_F_TENTATIVE) || 2779 ifp->flags & IFA_F_NODAD) { 2780 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2781 spin_unlock_bh(&ifp->lock); 2782 read_unlock_bh(&idev->lock); 2783 2784 addrconf_dad_completed(ifp); 2785 return; 2786 } 2787 2788 if (!(idev->if_flags & IF_READY)) { 2789 spin_unlock_bh(&ifp->lock); 2790 read_unlock_bh(&idev->lock); 2791 /* 2792 * If the defice is not ready: 2793 * - keep it tentative if it is a permanent address. 2794 * - otherwise, kill it. 2795 */ 2796 in6_ifa_hold(ifp); 2797 addrconf_dad_stop(ifp); 2798 return; 2799 } 2800 2801 /* 2802 * Optimistic nodes can start receiving 2803 * Frames right away 2804 */ 2805 if(ifp->flags & IFA_F_OPTIMISTIC) 2806 ip6_ins_rt(ifp->rt); 2807 2808 addrconf_dad_kick(ifp); 2809 spin_unlock_bh(&ifp->lock); 2810 out: 2811 read_unlock_bh(&idev->lock); 2812 } 2813 2814 static void addrconf_dad_timer(unsigned long data) 2815 { 2816 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2817 struct inet6_dev *idev = ifp->idev; 2818 struct in6_addr mcaddr; 2819 2820 read_lock_bh(&idev->lock); 2821 if (idev->dead) { 2822 read_unlock_bh(&idev->lock); 2823 goto out; 2824 } 2825 if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) { 2826 read_unlock_bh(&idev->lock); 2827 addrconf_dad_failure(ifp); 2828 return; 2829 } 2830 spin_lock_bh(&ifp->lock); 2831 if (ifp->probes == 0) { 2832 /* 2833 * DAD was successful 2834 */ 2835 2836 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2837 spin_unlock_bh(&ifp->lock); 2838 read_unlock_bh(&idev->lock); 2839 2840 addrconf_dad_completed(ifp); 2841 2842 goto out; 2843 } 2844 2845 ifp->probes--; 2846 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2847 spin_unlock_bh(&ifp->lock); 2848 read_unlock_bh(&idev->lock); 2849 2850 /* send a neighbour solicitation for our addr */ 2851 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2852 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2853 out: 2854 in6_ifa_put(ifp); 2855 } 2856 2857 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2858 { 2859 struct net_device * dev = ifp->idev->dev; 2860 2861 /* 2862 * Configure the address for reception. Now it is valid. 2863 */ 2864 2865 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2866 2867 /* If added prefix is link local and forwarding is off, 2868 start sending router solicitations. 2869 */ 2870 2871 if (ifp->idev->cnf.forwarding == 0 && 2872 ifp->idev->cnf.rtr_solicits > 0 && 2873 (dev->flags&IFF_LOOPBACK) == 0 && 2874 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2875 /* 2876 * If a host as already performed a random delay 2877 * [...] as part of DAD [...] there is no need 2878 * to delay again before sending the first RS 2879 */ 2880 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2881 2882 spin_lock_bh(&ifp->lock); 2883 ifp->probes = 1; 2884 ifp->idev->if_flags |= IF_RS_SENT; 2885 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2886 spin_unlock_bh(&ifp->lock); 2887 } 2888 } 2889 2890 static void addrconf_dad_run(struct inet6_dev *idev) { 2891 struct inet6_ifaddr *ifp; 2892 2893 read_lock_bh(&idev->lock); 2894 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2895 spin_lock_bh(&ifp->lock); 2896 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2897 spin_unlock_bh(&ifp->lock); 2898 continue; 2899 } 2900 spin_unlock_bh(&ifp->lock); 2901 addrconf_dad_kick(ifp); 2902 } 2903 read_unlock_bh(&idev->lock); 2904 } 2905 2906 #ifdef CONFIG_PROC_FS 2907 struct if6_iter_state { 2908 struct seq_net_private p; 2909 int bucket; 2910 }; 2911 2912 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2913 { 2914 struct inet6_ifaddr *ifa = NULL; 2915 struct if6_iter_state *state = seq->private; 2916 struct net *net = seq_file_net(seq); 2917 2918 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2919 ifa = inet6_addr_lst[state->bucket]; 2920 2921 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2922 ifa = ifa->lst_next; 2923 if (ifa) 2924 break; 2925 } 2926 return ifa; 2927 } 2928 2929 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2930 { 2931 struct if6_iter_state *state = seq->private; 2932 struct net *net = seq_file_net(seq); 2933 2934 ifa = ifa->lst_next; 2935 try_again: 2936 if (ifa) { 2937 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2938 ifa = ifa->lst_next; 2939 goto try_again; 2940 } 2941 } 2942 2943 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2944 ifa = inet6_addr_lst[state->bucket]; 2945 goto try_again; 2946 } 2947 2948 return ifa; 2949 } 2950 2951 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2952 { 2953 struct inet6_ifaddr *ifa = if6_get_first(seq); 2954 2955 if (ifa) 2956 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2957 --pos; 2958 return pos ? NULL : ifa; 2959 } 2960 2961 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2962 __acquires(addrconf_hash_lock) 2963 { 2964 read_lock_bh(&addrconf_hash_lock); 2965 return if6_get_idx(seq, *pos); 2966 } 2967 2968 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2969 { 2970 struct inet6_ifaddr *ifa; 2971 2972 ifa = if6_get_next(seq, v); 2973 ++*pos; 2974 return ifa; 2975 } 2976 2977 static void if6_seq_stop(struct seq_file *seq, void *v) 2978 __releases(addrconf_hash_lock) 2979 { 2980 read_unlock_bh(&addrconf_hash_lock); 2981 } 2982 2983 static int if6_seq_show(struct seq_file *seq, void *v) 2984 { 2985 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2986 seq_printf(seq, 2987 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2988 NIP6(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 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3642 errout: 3643 if (err < 0) 3644 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3645 } 3646 3647 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3648 __s32 *array, int bytes) 3649 { 3650 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3651 3652 memset(array, 0, bytes); 3653 array[DEVCONF_FORWARDING] = cnf->forwarding; 3654 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3655 array[DEVCONF_MTU6] = cnf->mtu6; 3656 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3657 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3658 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3659 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3660 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3661 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3662 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3663 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3664 #ifdef CONFIG_IPV6_PRIVACY 3665 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3666 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3667 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3668 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3669 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3670 #endif 3671 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3672 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3673 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3674 #ifdef CONFIG_IPV6_ROUTER_PREF 3675 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3676 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3677 #ifdef CONFIG_IPV6_ROUTE_INFO 3678 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3679 #endif 3680 #endif 3681 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3682 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3683 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3684 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3685 #endif 3686 #ifdef CONFIG_IPV6_MROUTE 3687 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3688 #endif 3689 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3690 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3691 } 3692 3693 static inline size_t inet6_if_nlmsg_size(void) 3694 { 3695 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3696 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3697 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3698 + nla_total_size(4) /* IFLA_MTU */ 3699 + nla_total_size(4) /* IFLA_LINK */ 3700 + nla_total_size( /* IFLA_PROTINFO */ 3701 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3702 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3703 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3704 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3705 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3706 ); 3707 } 3708 3709 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3710 int bytes) 3711 { 3712 int i; 3713 int pad = bytes - sizeof(u64) * items; 3714 BUG_ON(pad < 0); 3715 3716 /* Use put_unaligned() because stats may not be aligned for u64. */ 3717 put_unaligned(items, &stats[0]); 3718 for (i = 1; i < items; i++) 3719 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3720 3721 memset(&stats[items], 0, pad); 3722 } 3723 3724 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3725 int bytes) 3726 { 3727 switch(attrtype) { 3728 case IFLA_INET6_STATS: 3729 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3730 break; 3731 case IFLA_INET6_ICMP6STATS: 3732 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3733 break; 3734 } 3735 } 3736 3737 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3738 u32 pid, u32 seq, int event, unsigned int flags) 3739 { 3740 struct net_device *dev = idev->dev; 3741 struct nlattr *nla; 3742 struct ifinfomsg *hdr; 3743 struct nlmsghdr *nlh; 3744 void *protoinfo; 3745 struct ifla_cacheinfo ci; 3746 3747 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3748 if (nlh == NULL) 3749 return -EMSGSIZE; 3750 3751 hdr = nlmsg_data(nlh); 3752 hdr->ifi_family = AF_INET6; 3753 hdr->__ifi_pad = 0; 3754 hdr->ifi_type = dev->type; 3755 hdr->ifi_index = dev->ifindex; 3756 hdr->ifi_flags = dev_get_flags(dev); 3757 hdr->ifi_change = 0; 3758 3759 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3760 3761 if (dev->addr_len) 3762 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3763 3764 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3765 if (dev->ifindex != dev->iflink) 3766 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3767 3768 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3769 if (protoinfo == NULL) 3770 goto nla_put_failure; 3771 3772 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3773 3774 ci.max_reasm_len = IPV6_MAXPLEN; 3775 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3776 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3777 ci.reachable_time = idev->nd_parms->reachable_time; 3778 ci.retrans_time = idev->nd_parms->retrans_time; 3779 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3780 3781 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3782 if (nla == NULL) 3783 goto nla_put_failure; 3784 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3785 3786 /* XXX - MC not implemented */ 3787 3788 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3789 if (nla == NULL) 3790 goto nla_put_failure; 3791 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3792 3793 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3794 if (nla == NULL) 3795 goto nla_put_failure; 3796 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3797 3798 nla_nest_end(skb, protoinfo); 3799 return nlmsg_end(skb, nlh); 3800 3801 nla_put_failure: 3802 nlmsg_cancel(skb, nlh); 3803 return -EMSGSIZE; 3804 } 3805 3806 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3807 { 3808 struct net *net = sock_net(skb->sk); 3809 int idx, err; 3810 int s_idx = cb->args[0]; 3811 struct net_device *dev; 3812 struct inet6_dev *idev; 3813 3814 read_lock(&dev_base_lock); 3815 idx = 0; 3816 for_each_netdev(net, dev) { 3817 if (idx < s_idx) 3818 goto cont; 3819 if ((idev = in6_dev_get(dev)) == NULL) 3820 goto cont; 3821 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3822 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3823 in6_dev_put(idev); 3824 if (err <= 0) 3825 break; 3826 cont: 3827 idx++; 3828 } 3829 read_unlock(&dev_base_lock); 3830 cb->args[0] = idx; 3831 3832 return skb->len; 3833 } 3834 3835 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3836 { 3837 struct sk_buff *skb; 3838 struct net *net = dev_net(idev->dev); 3839 int err = -ENOBUFS; 3840 3841 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3842 if (skb == NULL) 3843 goto errout; 3844 3845 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3846 if (err < 0) { 3847 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3848 WARN_ON(err == -EMSGSIZE); 3849 kfree_skb(skb); 3850 goto errout; 3851 } 3852 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3853 errout: 3854 if (err < 0) 3855 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3856 } 3857 3858 static inline size_t inet6_prefix_nlmsg_size(void) 3859 { 3860 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3861 + nla_total_size(sizeof(struct in6_addr)) 3862 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3863 } 3864 3865 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3866 struct prefix_info *pinfo, u32 pid, u32 seq, 3867 int event, unsigned int flags) 3868 { 3869 struct prefixmsg *pmsg; 3870 struct nlmsghdr *nlh; 3871 struct prefix_cacheinfo ci; 3872 3873 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3874 if (nlh == NULL) 3875 return -EMSGSIZE; 3876 3877 pmsg = nlmsg_data(nlh); 3878 pmsg->prefix_family = AF_INET6; 3879 pmsg->prefix_pad1 = 0; 3880 pmsg->prefix_pad2 = 0; 3881 pmsg->prefix_ifindex = idev->dev->ifindex; 3882 pmsg->prefix_len = pinfo->prefix_len; 3883 pmsg->prefix_type = pinfo->type; 3884 pmsg->prefix_pad3 = 0; 3885 pmsg->prefix_flags = 0; 3886 if (pinfo->onlink) 3887 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3888 if (pinfo->autoconf) 3889 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3890 3891 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3892 3893 ci.preferred_time = ntohl(pinfo->prefered); 3894 ci.valid_time = ntohl(pinfo->valid); 3895 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3896 3897 return nlmsg_end(skb, nlh); 3898 3899 nla_put_failure: 3900 nlmsg_cancel(skb, nlh); 3901 return -EMSGSIZE; 3902 } 3903 3904 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3905 struct prefix_info *pinfo) 3906 { 3907 struct sk_buff *skb; 3908 struct net *net = dev_net(idev->dev); 3909 int err = -ENOBUFS; 3910 3911 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3912 if (skb == NULL) 3913 goto errout; 3914 3915 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3916 if (err < 0) { 3917 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3918 WARN_ON(err == -EMSGSIZE); 3919 kfree_skb(skb); 3920 goto errout; 3921 } 3922 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3923 errout: 3924 if (err < 0) 3925 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3926 } 3927 3928 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3929 { 3930 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3931 3932 switch (event) { 3933 case RTM_NEWADDR: 3934 /* 3935 * If the address was optimistic 3936 * we inserted the route at the start of 3937 * our DAD process, so we don't need 3938 * to do it again 3939 */ 3940 if (!(ifp->rt->rt6i_node)) 3941 ip6_ins_rt(ifp->rt); 3942 if (ifp->idev->cnf.forwarding) 3943 addrconf_join_anycast(ifp); 3944 break; 3945 case RTM_DELADDR: 3946 if (ifp->idev->cnf.forwarding) 3947 addrconf_leave_anycast(ifp); 3948 addrconf_leave_solict(ifp->idev, &ifp->addr); 3949 dst_hold(&ifp->rt->u.dst); 3950 if (ip6_del_rt(ifp->rt)) 3951 dst_free(&ifp->rt->u.dst); 3952 break; 3953 } 3954 } 3955 3956 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3957 { 3958 rcu_read_lock_bh(); 3959 if (likely(ifp->idev->dead == 0)) 3960 __ipv6_ifa_notify(event, ifp); 3961 rcu_read_unlock_bh(); 3962 } 3963 3964 #ifdef CONFIG_SYSCTL 3965 3966 static 3967 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3968 void __user *buffer, size_t *lenp, loff_t *ppos) 3969 { 3970 int *valp = ctl->data; 3971 int val = *valp; 3972 int ret; 3973 3974 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3975 3976 if (write) 3977 addrconf_fixup_forwarding(ctl, valp, val); 3978 return ret; 3979 } 3980 3981 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3982 int __user *name, int nlen, 3983 void __user *oldval, 3984 size_t __user *oldlenp, 3985 void __user *newval, size_t newlen) 3986 { 3987 int *valp = table->data; 3988 int val = *valp; 3989 int new; 3990 3991 if (!newval || !newlen) 3992 return 0; 3993 if (newlen != sizeof(int)) 3994 return -EINVAL; 3995 if (get_user(new, (int __user *)newval)) 3996 return -EFAULT; 3997 if (new == *valp) 3998 return 0; 3999 if (oldval && oldlenp) { 4000 size_t len; 4001 if (get_user(len, oldlenp)) 4002 return -EFAULT; 4003 if (len) { 4004 if (len > table->maxlen) 4005 len = table->maxlen; 4006 if (copy_to_user(oldval, valp, len)) 4007 return -EFAULT; 4008 if (put_user(len, oldlenp)) 4009 return -EFAULT; 4010 } 4011 } 4012 4013 *valp = new; 4014 addrconf_fixup_forwarding(table, valp, val); 4015 return 1; 4016 } 4017 4018 static struct addrconf_sysctl_table 4019 { 4020 struct ctl_table_header *sysctl_header; 4021 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4022 char *dev_name; 4023 } addrconf_sysctl __read_mostly = { 4024 .sysctl_header = NULL, 4025 .addrconf_vars = { 4026 { 4027 .ctl_name = NET_IPV6_FORWARDING, 4028 .procname = "forwarding", 4029 .data = &ipv6_devconf.forwarding, 4030 .maxlen = sizeof(int), 4031 .mode = 0644, 4032 .proc_handler = &addrconf_sysctl_forward, 4033 .strategy = &addrconf_sysctl_forward_strategy, 4034 }, 4035 { 4036 .ctl_name = NET_IPV6_HOP_LIMIT, 4037 .procname = "hop_limit", 4038 .data = &ipv6_devconf.hop_limit, 4039 .maxlen = sizeof(int), 4040 .mode = 0644, 4041 .proc_handler = proc_dointvec, 4042 }, 4043 { 4044 .ctl_name = NET_IPV6_MTU, 4045 .procname = "mtu", 4046 .data = &ipv6_devconf.mtu6, 4047 .maxlen = sizeof(int), 4048 .mode = 0644, 4049 .proc_handler = &proc_dointvec, 4050 }, 4051 { 4052 .ctl_name = NET_IPV6_ACCEPT_RA, 4053 .procname = "accept_ra", 4054 .data = &ipv6_devconf.accept_ra, 4055 .maxlen = sizeof(int), 4056 .mode = 0644, 4057 .proc_handler = &proc_dointvec, 4058 }, 4059 { 4060 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 4061 .procname = "accept_redirects", 4062 .data = &ipv6_devconf.accept_redirects, 4063 .maxlen = sizeof(int), 4064 .mode = 0644, 4065 .proc_handler = &proc_dointvec, 4066 }, 4067 { 4068 .ctl_name = NET_IPV6_AUTOCONF, 4069 .procname = "autoconf", 4070 .data = &ipv6_devconf.autoconf, 4071 .maxlen = sizeof(int), 4072 .mode = 0644, 4073 .proc_handler = &proc_dointvec, 4074 }, 4075 { 4076 .ctl_name = NET_IPV6_DAD_TRANSMITS, 4077 .procname = "dad_transmits", 4078 .data = &ipv6_devconf.dad_transmits, 4079 .maxlen = sizeof(int), 4080 .mode = 0644, 4081 .proc_handler = &proc_dointvec, 4082 }, 4083 { 4084 .ctl_name = NET_IPV6_RTR_SOLICITS, 4085 .procname = "router_solicitations", 4086 .data = &ipv6_devconf.rtr_solicits, 4087 .maxlen = sizeof(int), 4088 .mode = 0644, 4089 .proc_handler = &proc_dointvec, 4090 }, 4091 { 4092 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 4093 .procname = "router_solicitation_interval", 4094 .data = &ipv6_devconf.rtr_solicit_interval, 4095 .maxlen = sizeof(int), 4096 .mode = 0644, 4097 .proc_handler = &proc_dointvec_jiffies, 4098 .strategy = &sysctl_jiffies, 4099 }, 4100 { 4101 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 4102 .procname = "router_solicitation_delay", 4103 .data = &ipv6_devconf.rtr_solicit_delay, 4104 .maxlen = sizeof(int), 4105 .mode = 0644, 4106 .proc_handler = &proc_dointvec_jiffies, 4107 .strategy = &sysctl_jiffies, 4108 }, 4109 { 4110 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 4111 .procname = "force_mld_version", 4112 .data = &ipv6_devconf.force_mld_version, 4113 .maxlen = sizeof(int), 4114 .mode = 0644, 4115 .proc_handler = &proc_dointvec, 4116 }, 4117 #ifdef CONFIG_IPV6_PRIVACY 4118 { 4119 .ctl_name = NET_IPV6_USE_TEMPADDR, 4120 .procname = "use_tempaddr", 4121 .data = &ipv6_devconf.use_tempaddr, 4122 .maxlen = sizeof(int), 4123 .mode = 0644, 4124 .proc_handler = &proc_dointvec, 4125 }, 4126 { 4127 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 4128 .procname = "temp_valid_lft", 4129 .data = &ipv6_devconf.temp_valid_lft, 4130 .maxlen = sizeof(int), 4131 .mode = 0644, 4132 .proc_handler = &proc_dointvec, 4133 }, 4134 { 4135 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 4136 .procname = "temp_prefered_lft", 4137 .data = &ipv6_devconf.temp_prefered_lft, 4138 .maxlen = sizeof(int), 4139 .mode = 0644, 4140 .proc_handler = &proc_dointvec, 4141 }, 4142 { 4143 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4144 .procname = "regen_max_retry", 4145 .data = &ipv6_devconf.regen_max_retry, 4146 .maxlen = sizeof(int), 4147 .mode = 0644, 4148 .proc_handler = &proc_dointvec, 4149 }, 4150 { 4151 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4152 .procname = "max_desync_factor", 4153 .data = &ipv6_devconf.max_desync_factor, 4154 .maxlen = sizeof(int), 4155 .mode = 0644, 4156 .proc_handler = &proc_dointvec, 4157 }, 4158 #endif 4159 { 4160 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4161 .procname = "max_addresses", 4162 .data = &ipv6_devconf.max_addresses, 4163 .maxlen = sizeof(int), 4164 .mode = 0644, 4165 .proc_handler = &proc_dointvec, 4166 }, 4167 { 4168 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4169 .procname = "accept_ra_defrtr", 4170 .data = &ipv6_devconf.accept_ra_defrtr, 4171 .maxlen = sizeof(int), 4172 .mode = 0644, 4173 .proc_handler = &proc_dointvec, 4174 }, 4175 { 4176 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4177 .procname = "accept_ra_pinfo", 4178 .data = &ipv6_devconf.accept_ra_pinfo, 4179 .maxlen = sizeof(int), 4180 .mode = 0644, 4181 .proc_handler = &proc_dointvec, 4182 }, 4183 #ifdef CONFIG_IPV6_ROUTER_PREF 4184 { 4185 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4186 .procname = "accept_ra_rtr_pref", 4187 .data = &ipv6_devconf.accept_ra_rtr_pref, 4188 .maxlen = sizeof(int), 4189 .mode = 0644, 4190 .proc_handler = &proc_dointvec, 4191 }, 4192 { 4193 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4194 .procname = "router_probe_interval", 4195 .data = &ipv6_devconf.rtr_probe_interval, 4196 .maxlen = sizeof(int), 4197 .mode = 0644, 4198 .proc_handler = &proc_dointvec_jiffies, 4199 .strategy = &sysctl_jiffies, 4200 }, 4201 #ifdef CONFIG_IPV6_ROUTE_INFO 4202 { 4203 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4204 .procname = "accept_ra_rt_info_max_plen", 4205 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4206 .maxlen = sizeof(int), 4207 .mode = 0644, 4208 .proc_handler = &proc_dointvec, 4209 }, 4210 #endif 4211 #endif 4212 { 4213 .ctl_name = NET_IPV6_PROXY_NDP, 4214 .procname = "proxy_ndp", 4215 .data = &ipv6_devconf.proxy_ndp, 4216 .maxlen = sizeof(int), 4217 .mode = 0644, 4218 .proc_handler = &proc_dointvec, 4219 }, 4220 { 4221 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4222 .procname = "accept_source_route", 4223 .data = &ipv6_devconf.accept_source_route, 4224 .maxlen = sizeof(int), 4225 .mode = 0644, 4226 .proc_handler = &proc_dointvec, 4227 }, 4228 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4229 { 4230 .ctl_name = CTL_UNNUMBERED, 4231 .procname = "optimistic_dad", 4232 .data = &ipv6_devconf.optimistic_dad, 4233 .maxlen = sizeof(int), 4234 .mode = 0644, 4235 .proc_handler = &proc_dointvec, 4236 4237 }, 4238 #endif 4239 #ifdef CONFIG_IPV6_MROUTE 4240 { 4241 .ctl_name = CTL_UNNUMBERED, 4242 .procname = "mc_forwarding", 4243 .data = &ipv6_devconf.mc_forwarding, 4244 .maxlen = sizeof(int), 4245 .mode = 0644, 4246 .proc_handler = &proc_dointvec, 4247 }, 4248 #endif 4249 { 4250 .ctl_name = CTL_UNNUMBERED, 4251 .procname = "disable_ipv6", 4252 .data = &ipv6_devconf.disable_ipv6, 4253 .maxlen = sizeof(int), 4254 .mode = 0644, 4255 .proc_handler = &proc_dointvec, 4256 }, 4257 { 4258 .ctl_name = CTL_UNNUMBERED, 4259 .procname = "accept_dad", 4260 .data = &ipv6_devconf.accept_dad, 4261 .maxlen = sizeof(int), 4262 .mode = 0644, 4263 .proc_handler = &proc_dointvec, 4264 }, 4265 { 4266 .ctl_name = 0, /* sentinel */ 4267 } 4268 }, 4269 }; 4270 4271 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4272 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4273 { 4274 int i; 4275 struct addrconf_sysctl_table *t; 4276 4277 #define ADDRCONF_CTL_PATH_DEV 3 4278 4279 struct ctl_path addrconf_ctl_path[] = { 4280 { .procname = "net", .ctl_name = CTL_NET, }, 4281 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4282 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4283 { /* to be set */ }, 4284 { }, 4285 }; 4286 4287 4288 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4289 if (t == NULL) 4290 goto out; 4291 4292 for (i=0; t->addrconf_vars[i].data; i++) { 4293 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4294 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4295 t->addrconf_vars[i].extra2 = net; 4296 } 4297 4298 /* 4299 * Make a copy of dev_name, because '.procname' is regarded as const 4300 * by sysctl and we wouldn't want anyone to change it under our feet 4301 * (see SIOCSIFNAME). 4302 */ 4303 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4304 if (!t->dev_name) 4305 goto free; 4306 4307 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4308 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4309 4310 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4311 t->addrconf_vars); 4312 if (t->sysctl_header == NULL) 4313 goto free_procname; 4314 4315 p->sysctl = t; 4316 return 0; 4317 4318 free_procname: 4319 kfree(t->dev_name); 4320 free: 4321 kfree(t); 4322 out: 4323 return -ENOBUFS; 4324 } 4325 4326 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4327 { 4328 struct addrconf_sysctl_table *t; 4329 4330 if (p->sysctl == NULL) 4331 return; 4332 4333 t = p->sysctl; 4334 p->sysctl = NULL; 4335 unregister_sysctl_table(t->sysctl_header); 4336 kfree(t->dev_name); 4337 kfree(t); 4338 } 4339 4340 static void addrconf_sysctl_register(struct inet6_dev *idev) 4341 { 4342 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4343 NET_IPV6_NEIGH, "ipv6", 4344 &ndisc_ifinfo_sysctl_change, 4345 ndisc_ifinfo_sysctl_strategy); 4346 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4347 idev->dev->ifindex, idev, &idev->cnf); 4348 } 4349 4350 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4351 { 4352 __addrconf_sysctl_unregister(&idev->cnf); 4353 neigh_sysctl_unregister(idev->nd_parms); 4354 } 4355 4356 4357 #endif 4358 4359 static int addrconf_init_net(struct net *net) 4360 { 4361 int err; 4362 struct ipv6_devconf *all, *dflt; 4363 4364 err = -ENOMEM; 4365 all = &ipv6_devconf; 4366 dflt = &ipv6_devconf_dflt; 4367 4368 if (net != &init_net) { 4369 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4370 if (all == NULL) 4371 goto err_alloc_all; 4372 4373 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4374 if (dflt == NULL) 4375 goto err_alloc_dflt; 4376 } 4377 4378 net->ipv6.devconf_all = all; 4379 net->ipv6.devconf_dflt = dflt; 4380 4381 #ifdef CONFIG_SYSCTL 4382 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4383 NULL, all); 4384 if (err < 0) 4385 goto err_reg_all; 4386 4387 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4388 NULL, dflt); 4389 if (err < 0) 4390 goto err_reg_dflt; 4391 #endif 4392 return 0; 4393 4394 #ifdef CONFIG_SYSCTL 4395 err_reg_dflt: 4396 __addrconf_sysctl_unregister(all); 4397 err_reg_all: 4398 kfree(dflt); 4399 #endif 4400 err_alloc_dflt: 4401 kfree(all); 4402 err_alloc_all: 4403 return err; 4404 } 4405 4406 static void addrconf_exit_net(struct net *net) 4407 { 4408 #ifdef CONFIG_SYSCTL 4409 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4410 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4411 #endif 4412 if (net != &init_net) { 4413 kfree(net->ipv6.devconf_dflt); 4414 kfree(net->ipv6.devconf_all); 4415 } 4416 } 4417 4418 static struct pernet_operations addrconf_ops = { 4419 .init = addrconf_init_net, 4420 .exit = addrconf_exit_net, 4421 }; 4422 4423 /* 4424 * Device notifier 4425 */ 4426 4427 int register_inet6addr_notifier(struct notifier_block *nb) 4428 { 4429 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4430 } 4431 4432 EXPORT_SYMBOL(register_inet6addr_notifier); 4433 4434 int unregister_inet6addr_notifier(struct notifier_block *nb) 4435 { 4436 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4437 } 4438 4439 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4440 4441 static void addrconf_net_exit(struct net *net) 4442 { 4443 struct net_device *dev; 4444 4445 rtnl_lock(); 4446 /* clean dev list */ 4447 for_each_netdev(net, dev) { 4448 if (__in6_dev_get(dev) == NULL) 4449 continue; 4450 addrconf_ifdown(dev, 1); 4451 } 4452 addrconf_ifdown(net->loopback_dev, 2); 4453 rtnl_unlock(); 4454 } 4455 4456 static struct pernet_operations addrconf_net_ops = { 4457 .exit = addrconf_net_exit, 4458 }; 4459 4460 /* 4461 * Init / cleanup code 4462 */ 4463 4464 int __init addrconf_init(void) 4465 { 4466 int err; 4467 4468 if ((err = ipv6_addr_label_init()) < 0) { 4469 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4470 err); 4471 return err; 4472 } 4473 4474 register_pernet_subsys(&addrconf_ops); 4475 4476 /* The addrconf netdev notifier requires that loopback_dev 4477 * has it's ipv6 private information allocated and setup 4478 * before it can bring up and give link-local addresses 4479 * to other devices which are up. 4480 * 4481 * Unfortunately, loopback_dev is not necessarily the first 4482 * entry in the global dev_base list of net devices. In fact, 4483 * it is likely to be the very last entry on that list. 4484 * So this causes the notifier registry below to try and 4485 * give link-local addresses to all devices besides loopback_dev 4486 * first, then loopback_dev, which cases all the non-loopback_dev 4487 * devices to fail to get a link-local address. 4488 * 4489 * So, as a temporary fix, allocate the ipv6 structure for 4490 * loopback_dev first by hand. 4491 * Longer term, all of the dependencies ipv6 has upon the loopback 4492 * device and it being up should be removed. 4493 */ 4494 rtnl_lock(); 4495 if (!ipv6_add_dev(init_net.loopback_dev)) 4496 err = -ENOMEM; 4497 rtnl_unlock(); 4498 if (err) 4499 goto errlo; 4500 4501 err = register_pernet_device(&addrconf_net_ops); 4502 if (err) 4503 return err; 4504 4505 register_netdevice_notifier(&ipv6_dev_notf); 4506 4507 addrconf_verify(0); 4508 4509 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4510 if (err < 0) 4511 goto errout; 4512 4513 /* Only the first call to __rtnl_register can fail */ 4514 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4515 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4516 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4517 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4518 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4519 4520 ipv6_addr_label_rtnl_register(); 4521 4522 return 0; 4523 errout: 4524 unregister_netdevice_notifier(&ipv6_dev_notf); 4525 errlo: 4526 unregister_pernet_subsys(&addrconf_ops); 4527 4528 return err; 4529 } 4530 4531 void addrconf_cleanup(void) 4532 { 4533 struct inet6_ifaddr *ifa; 4534 int i; 4535 4536 unregister_netdevice_notifier(&ipv6_dev_notf); 4537 unregister_pernet_device(&addrconf_net_ops); 4538 4539 unregister_pernet_subsys(&addrconf_ops); 4540 4541 rtnl_lock(); 4542 4543 /* 4544 * Check hash table. 4545 */ 4546 write_lock_bh(&addrconf_hash_lock); 4547 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4548 for (ifa=inet6_addr_lst[i]; ifa; ) { 4549 struct inet6_ifaddr *bifa; 4550 4551 bifa = ifa; 4552 ifa = ifa->lst_next; 4553 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4554 /* Do not free it; something is wrong. 4555 Now we can investigate it with debugger. 4556 */ 4557 } 4558 } 4559 write_unlock_bh(&addrconf_hash_lock); 4560 4561 del_timer(&addr_chk_timer); 4562 rtnl_unlock(); 4563 4564 unregister_pernet_subsys(&addrconf_net_ops); 4565 } 4566