1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #include <linux/errno.h> 42 #include <linux/types.h> 43 #include <linux/kernel.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <linux/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 91 /* Set to 3 to get tracing... */ 92 #define ACONF_DEBUG 2 93 94 #if ACONF_DEBUG >= 3 95 #define ADBG(x) printk x 96 #else 97 #define ADBG(x) 98 #endif 99 100 #define INFINITY_LIFE_TIME 0xFFFFFFFF 101 #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b))) 102 103 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 104 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 105 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 106 107 #ifdef CONFIG_SYSCTL 108 static void addrconf_sysctl_register(struct inet6_dev *idev); 109 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 110 #else 111 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 112 { 113 } 114 115 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 116 { 117 } 118 #endif 119 120 #ifdef CONFIG_IPV6_PRIVACY 121 static int __ipv6_regen_rndid(struct inet6_dev *idev); 122 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 123 static void ipv6_regen_rndid(unsigned long data); 124 #endif 125 126 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 127 static int ipv6_count_addresses(struct inet6_dev *idev); 128 129 /* 130 * Configured unicast address hash table 131 */ 132 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 133 static DEFINE_SPINLOCK(addrconf_hash_lock); 134 135 static void addrconf_verify(unsigned long); 136 137 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 138 static DEFINE_SPINLOCK(addrconf_verify_lock); 139 140 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 141 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 142 143 static void addrconf_type_change(struct net_device *dev, 144 unsigned long event); 145 static int addrconf_ifdown(struct net_device *dev, int how); 146 147 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 148 static void addrconf_dad_timer(unsigned long data); 149 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 150 static void addrconf_dad_run(struct inet6_dev *idev); 151 static void addrconf_rs_timer(unsigned long data); 152 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 153 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 154 155 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 156 struct prefix_info *pinfo); 157 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 158 struct net_device *dev); 159 160 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 161 162 static struct ipv6_devconf ipv6_devconf __read_mostly = { 163 .forwarding = 0, 164 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 165 .mtu6 = IPV6_MIN_MTU, 166 .accept_ra = 1, 167 .accept_redirects = 1, 168 .autoconf = 1, 169 .force_mld_version = 0, 170 .dad_transmits = 1, 171 .rtr_solicits = MAX_RTR_SOLICITATIONS, 172 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 173 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 174 #ifdef CONFIG_IPV6_PRIVACY 175 .use_tempaddr = 0, 176 .temp_valid_lft = TEMP_VALID_LIFETIME, 177 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 178 .regen_max_retry = REGEN_MAX_RETRY, 179 .max_desync_factor = MAX_DESYNC_FACTOR, 180 #endif 181 .max_addresses = IPV6_MAX_ADDRESSES, 182 .accept_ra_defrtr = 1, 183 .accept_ra_pinfo = 1, 184 #ifdef CONFIG_IPV6_ROUTER_PREF 185 .accept_ra_rtr_pref = 1, 186 .rtr_probe_interval = 60 * HZ, 187 #ifdef CONFIG_IPV6_ROUTE_INFO 188 .accept_ra_rt_info_max_plen = 0, 189 #endif 190 #endif 191 .proxy_ndp = 0, 192 .accept_source_route = 0, /* we do not accept RH0 by default. */ 193 .disable_ipv6 = 0, 194 .accept_dad = 1, 195 }; 196 197 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 198 .forwarding = 0, 199 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 200 .mtu6 = IPV6_MIN_MTU, 201 .accept_ra = 1, 202 .accept_redirects = 1, 203 .autoconf = 1, 204 .dad_transmits = 1, 205 .rtr_solicits = MAX_RTR_SOLICITATIONS, 206 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 207 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 208 #ifdef CONFIG_IPV6_PRIVACY 209 .use_tempaddr = 0, 210 .temp_valid_lft = TEMP_VALID_LIFETIME, 211 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 212 .regen_max_retry = REGEN_MAX_RETRY, 213 .max_desync_factor = MAX_DESYNC_FACTOR, 214 #endif 215 .max_addresses = IPV6_MAX_ADDRESSES, 216 .accept_ra_defrtr = 1, 217 .accept_ra_pinfo = 1, 218 #ifdef CONFIG_IPV6_ROUTER_PREF 219 .accept_ra_rtr_pref = 1, 220 .rtr_probe_interval = 60 * HZ, 221 #ifdef CONFIG_IPV6_ROUTE_INFO 222 .accept_ra_rt_info_max_plen = 0, 223 #endif 224 #endif 225 .proxy_ndp = 0, 226 .accept_source_route = 0, /* we do not accept RH0 by default. */ 227 .disable_ipv6 = 0, 228 .accept_dad = 1, 229 }; 230 231 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 232 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 233 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 234 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 235 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 236 237 /* Check if a valid qdisc is available */ 238 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 239 { 240 return !qdisc_tx_is_noop(dev); 241 } 242 243 /* Check if a route is valid prefix route */ 244 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 245 { 246 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 247 } 248 249 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 250 { 251 if (del_timer(&ifp->timer)) 252 __in6_ifa_put(ifp); 253 } 254 255 enum addrconf_timer_t { 256 AC_NONE, 257 AC_DAD, 258 AC_RS, 259 }; 260 261 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 262 enum addrconf_timer_t what, 263 unsigned long when) 264 { 265 if (!del_timer(&ifp->timer)) 266 in6_ifa_hold(ifp); 267 268 switch (what) { 269 case AC_DAD: 270 ifp->timer.function = addrconf_dad_timer; 271 break; 272 case AC_RS: 273 ifp->timer.function = addrconf_rs_timer; 274 break; 275 default: 276 break; 277 } 278 ifp->timer.expires = jiffies + when; 279 add_timer(&ifp->timer); 280 } 281 282 static int snmp6_alloc_dev(struct inet6_dev *idev) 283 { 284 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 285 sizeof(struct ipstats_mib), 286 __alignof__(struct ipstats_mib)) < 0) 287 goto err_ip; 288 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6, 289 sizeof(struct icmpv6_mib), 290 __alignof__(struct icmpv6_mib)) < 0) 291 goto err_icmp; 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg, 293 sizeof(struct icmpv6msg_mib), 294 __alignof__(struct icmpv6msg_mib)) < 0) 295 goto err_icmpmsg; 296 297 return 0; 298 299 err_icmpmsg: 300 snmp_mib_free((void __percpu **)idev->stats.icmpv6); 301 err_icmp: 302 snmp_mib_free((void __percpu **)idev->stats.ipv6); 303 err_ip: 304 return -ENOMEM; 305 } 306 307 static void snmp6_free_dev(struct inet6_dev *idev) 308 { 309 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg); 310 snmp_mib_free((void __percpu **)idev->stats.icmpv6); 311 snmp_mib_free((void __percpu **)idev->stats.ipv6); 312 } 313 314 /* Nobody refers to this device, we may destroy it. */ 315 316 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 317 { 318 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 319 kfree(idev); 320 } 321 322 void in6_dev_finish_destroy(struct inet6_dev *idev) 323 { 324 struct net_device *dev = idev->dev; 325 326 WARN_ON(!list_empty(&idev->addr_list)); 327 WARN_ON(idev->mc_list != NULL); 328 329 #ifdef NET_REFCNT_DEBUG 330 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 331 #endif 332 dev_put(dev); 333 if (!idev->dead) { 334 pr_warning("Freeing alive inet6 device %p\n", idev); 335 return; 336 } 337 snmp6_free_dev(idev); 338 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 339 } 340 341 EXPORT_SYMBOL(in6_dev_finish_destroy); 342 343 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 344 { 345 struct inet6_dev *ndev; 346 347 ASSERT_RTNL(); 348 349 if (dev->mtu < IPV6_MIN_MTU) 350 return NULL; 351 352 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 353 354 if (ndev == NULL) 355 return NULL; 356 357 rwlock_init(&ndev->lock); 358 ndev->dev = dev; 359 INIT_LIST_HEAD(&ndev->addr_list); 360 361 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 362 ndev->cnf.mtu6 = dev->mtu; 363 ndev->cnf.sysctl = NULL; 364 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 365 if (ndev->nd_parms == NULL) { 366 kfree(ndev); 367 return NULL; 368 } 369 if (ndev->cnf.forwarding) 370 dev_disable_lro(dev); 371 /* We refer to the device */ 372 dev_hold(dev); 373 374 if (snmp6_alloc_dev(ndev) < 0) { 375 ADBG((KERN_WARNING 376 "%s(): cannot allocate memory for statistics; dev=%s.\n", 377 __func__, dev->name)); 378 neigh_parms_release(&nd_tbl, ndev->nd_parms); 379 ndev->dead = 1; 380 in6_dev_finish_destroy(ndev); 381 return NULL; 382 } 383 384 if (snmp6_register_dev(ndev) < 0) { 385 ADBG((KERN_WARNING 386 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 387 __func__, dev->name)); 388 neigh_parms_release(&nd_tbl, ndev->nd_parms); 389 ndev->dead = 1; 390 in6_dev_finish_destroy(ndev); 391 return NULL; 392 } 393 394 /* One reference from device. We must do this before 395 * we invoke __ipv6_regen_rndid(). 396 */ 397 in6_dev_hold(ndev); 398 399 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 400 ndev->cnf.accept_dad = -1; 401 402 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 403 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 404 printk(KERN_INFO 405 "%s: Disabled Multicast RS\n", 406 dev->name); 407 ndev->cnf.rtr_solicits = 0; 408 } 409 #endif 410 411 #ifdef CONFIG_IPV6_PRIVACY 412 INIT_LIST_HEAD(&ndev->tempaddr_list); 413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 414 if ((dev->flags&IFF_LOOPBACK) || 415 dev->type == ARPHRD_TUNNEL || 416 dev->type == ARPHRD_TUNNEL6 || 417 dev->type == ARPHRD_SIT || 418 dev->type == ARPHRD_NONE) { 419 printk(KERN_INFO 420 "%s: Disabled Privacy Extensions\n", 421 dev->name); 422 ndev->cnf.use_tempaddr = -1; 423 } else { 424 in6_dev_hold(ndev); 425 ipv6_regen_rndid((unsigned long) ndev); 426 } 427 #endif 428 429 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 430 ndev->if_flags |= IF_READY; 431 432 ipv6_mc_init_dev(ndev); 433 ndev->tstamp = jiffies; 434 addrconf_sysctl_register(ndev); 435 /* protected by rtnl_lock */ 436 rcu_assign_pointer(dev->ip6_ptr, ndev); 437 438 /* Join all-node multicast group */ 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 440 441 return ndev; 442 } 443 444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 445 { 446 struct inet6_dev *idev; 447 448 ASSERT_RTNL(); 449 450 idev = __in6_dev_get(dev); 451 if (!idev) { 452 idev = ipv6_add_dev(dev); 453 if (!idev) 454 return NULL; 455 } 456 457 if (dev->flags&IFF_UP) 458 ipv6_mc_up(idev); 459 return idev; 460 } 461 462 #ifdef CONFIG_SYSCTL 463 static void dev_forward_change(struct inet6_dev *idev) 464 { 465 struct net_device *dev; 466 struct inet6_ifaddr *ifa; 467 468 if (!idev) 469 return; 470 dev = idev->dev; 471 if (idev->cnf.forwarding) 472 dev_disable_lro(dev); 473 if (dev && (dev->flags & IFF_MULTICAST)) { 474 if (idev->cnf.forwarding) 475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 476 else 477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 478 } 479 480 list_for_each_entry(ifa, &idev->addr_list, if_list) { 481 if (ifa->flags&IFA_F_TENTATIVE) 482 continue; 483 if (idev->cnf.forwarding) 484 addrconf_join_anycast(ifa); 485 else 486 addrconf_leave_anycast(ifa); 487 } 488 } 489 490 491 static void addrconf_forward_change(struct net *net, __s32 newf) 492 { 493 struct net_device *dev; 494 struct inet6_dev *idev; 495 496 rcu_read_lock(); 497 for_each_netdev_rcu(net, dev) { 498 idev = __in6_dev_get(dev); 499 if (idev) { 500 int changed = (!idev->cnf.forwarding) ^ (!newf); 501 idev->cnf.forwarding = newf; 502 if (changed) 503 dev_forward_change(idev); 504 } 505 } 506 rcu_read_unlock(); 507 } 508 509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 510 { 511 struct net *net; 512 513 net = (struct net *)table->extra2; 514 if (p == &net->ipv6.devconf_dflt->forwarding) 515 return 0; 516 517 if (!rtnl_trylock()) { 518 /* Restore the original values before restarting */ 519 *p = old; 520 return restart_syscall(); 521 } 522 523 if (p == &net->ipv6.devconf_all->forwarding) { 524 __s32 newf = net->ipv6.devconf_all->forwarding; 525 net->ipv6.devconf_dflt->forwarding = newf; 526 addrconf_forward_change(net, newf); 527 } else if ((!*p) ^ (!old)) 528 dev_forward_change((struct inet6_dev *)table->extra1); 529 rtnl_unlock(); 530 531 if (*p) 532 rt6_purge_dflt_routers(net); 533 return 1; 534 } 535 #endif 536 537 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head) 538 { 539 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu); 540 kfree(ifp); 541 } 542 543 /* Nobody refers to this ifaddr, destroy it */ 544 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 545 { 546 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 547 548 #ifdef NET_REFCNT_DEBUG 549 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 550 #endif 551 552 in6_dev_put(ifp->idev); 553 554 if (del_timer(&ifp->timer)) 555 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 556 557 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 558 pr_warning("Freeing alive inet6 address %p\n", ifp); 559 return; 560 } 561 dst_release(&ifp->rt->dst); 562 563 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu); 564 } 565 566 static void 567 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 568 { 569 struct list_head *p; 570 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 571 572 /* 573 * Each device address list is sorted in order of scope - 574 * global before linklocal. 575 */ 576 list_for_each(p, &idev->addr_list) { 577 struct inet6_ifaddr *ifa 578 = list_entry(p, struct inet6_ifaddr, if_list); 579 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 580 break; 581 } 582 583 list_add_tail(&ifp->if_list, p); 584 } 585 586 static u32 ipv6_addr_hash(const struct in6_addr *addr) 587 { 588 /* 589 * We perform the hash function over the last 64 bits of the address 590 * This will include the IEEE address token on links that support it. 591 */ 592 return jhash_2words((__force u32)addr->s6_addr32[2], 593 (__force u32)addr->s6_addr32[3], 0) 594 & (IN6_ADDR_HSIZE - 1); 595 } 596 597 /* On success it returns ifp with increased reference count */ 598 599 static struct inet6_ifaddr * 600 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 601 int scope, u32 flags) 602 { 603 struct inet6_ifaddr *ifa = NULL; 604 struct rt6_info *rt; 605 unsigned int hash; 606 int err = 0; 607 int addr_type = ipv6_addr_type(addr); 608 609 if (addr_type == IPV6_ADDR_ANY || 610 addr_type & IPV6_ADDR_MULTICAST || 611 (!(idev->dev->flags & IFF_LOOPBACK) && 612 addr_type & IPV6_ADDR_LOOPBACK)) 613 return ERR_PTR(-EADDRNOTAVAIL); 614 615 rcu_read_lock_bh(); 616 if (idev->dead) { 617 err = -ENODEV; /*XXX*/ 618 goto out2; 619 } 620 621 if (idev->cnf.disable_ipv6) { 622 err = -EACCES; 623 goto out2; 624 } 625 626 spin_lock(&addrconf_hash_lock); 627 628 /* Ignore adding duplicate addresses on an interface */ 629 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 630 ADBG(("ipv6_add_addr: already assigned\n")); 631 err = -EEXIST; 632 goto out; 633 } 634 635 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 636 637 if (ifa == NULL) { 638 ADBG(("ipv6_add_addr: malloc failed\n")); 639 err = -ENOBUFS; 640 goto out; 641 } 642 643 rt = addrconf_dst_alloc(idev, addr, 0); 644 if (IS_ERR(rt)) { 645 err = PTR_ERR(rt); 646 goto out; 647 } 648 649 ipv6_addr_copy(&ifa->addr, addr); 650 651 spin_lock_init(&ifa->lock); 652 spin_lock_init(&ifa->state_lock); 653 init_timer(&ifa->timer); 654 INIT_HLIST_NODE(&ifa->addr_lst); 655 ifa->timer.data = (unsigned long) ifa; 656 ifa->scope = scope; 657 ifa->prefix_len = pfxlen; 658 ifa->flags = flags | IFA_F_TENTATIVE; 659 ifa->cstamp = ifa->tstamp = jiffies; 660 661 ifa->rt = rt; 662 663 /* 664 * part one of RFC 4429, section 3.3 665 * We should not configure an address as 666 * optimistic if we do not yet know the link 667 * layer address of our nexhop router 668 */ 669 670 if (rt->rt6i_nexthop == NULL) 671 ifa->flags &= ~IFA_F_OPTIMISTIC; 672 673 ifa->idev = idev; 674 in6_dev_hold(idev); 675 /* For caller */ 676 in6_ifa_hold(ifa); 677 678 /* Add to big hash table */ 679 hash = ipv6_addr_hash(addr); 680 681 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 682 spin_unlock(&addrconf_hash_lock); 683 684 write_lock(&idev->lock); 685 /* Add to inet6_dev unicast addr list. */ 686 ipv6_link_dev_addr(idev, ifa); 687 688 #ifdef CONFIG_IPV6_PRIVACY 689 if (ifa->flags&IFA_F_TEMPORARY) { 690 list_add(&ifa->tmp_list, &idev->tempaddr_list); 691 in6_ifa_hold(ifa); 692 } 693 #endif 694 695 in6_ifa_hold(ifa); 696 write_unlock(&idev->lock); 697 out2: 698 rcu_read_unlock_bh(); 699 700 if (likely(err == 0)) 701 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 702 else { 703 kfree(ifa); 704 ifa = ERR_PTR(err); 705 } 706 707 return ifa; 708 out: 709 spin_unlock(&addrconf_hash_lock); 710 goto out2; 711 } 712 713 /* This function wants to get referenced ifp and releases it before return */ 714 715 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 716 { 717 struct inet6_ifaddr *ifa, *ifn; 718 struct inet6_dev *idev = ifp->idev; 719 int state; 720 int hash; 721 int deleted = 0, onlink = 0; 722 unsigned long expires = jiffies; 723 724 hash = ipv6_addr_hash(&ifp->addr); 725 726 spin_lock_bh(&ifp->state_lock); 727 state = ifp->state; 728 ifp->state = INET6_IFADDR_STATE_DEAD; 729 spin_unlock_bh(&ifp->state_lock); 730 731 if (state == INET6_IFADDR_STATE_DEAD) 732 goto out; 733 734 spin_lock_bh(&addrconf_hash_lock); 735 hlist_del_init_rcu(&ifp->addr_lst); 736 spin_unlock_bh(&addrconf_hash_lock); 737 738 write_lock_bh(&idev->lock); 739 #ifdef CONFIG_IPV6_PRIVACY 740 if (ifp->flags&IFA_F_TEMPORARY) { 741 list_del(&ifp->tmp_list); 742 if (ifp->ifpub) { 743 in6_ifa_put(ifp->ifpub); 744 ifp->ifpub = NULL; 745 } 746 __in6_ifa_put(ifp); 747 } 748 #endif 749 750 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 751 if (ifa == ifp) { 752 list_del_init(&ifp->if_list); 753 __in6_ifa_put(ifp); 754 755 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 756 break; 757 deleted = 1; 758 continue; 759 } else if (ifp->flags & IFA_F_PERMANENT) { 760 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 761 ifp->prefix_len)) { 762 if (ifa->flags & IFA_F_PERMANENT) { 763 onlink = 1; 764 if (deleted) 765 break; 766 } else { 767 unsigned long lifetime; 768 769 if (!onlink) 770 onlink = -1; 771 772 spin_lock(&ifa->lock); 773 774 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 775 /* 776 * Note: Because this address is 777 * not permanent, lifetime < 778 * LONG_MAX / HZ here. 779 */ 780 if (time_before(expires, 781 ifa->tstamp + lifetime * HZ)) 782 expires = ifa->tstamp + lifetime * HZ; 783 spin_unlock(&ifa->lock); 784 } 785 } 786 } 787 } 788 write_unlock_bh(&idev->lock); 789 790 addrconf_del_timer(ifp); 791 792 ipv6_ifa_notify(RTM_DELADDR, ifp); 793 794 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 795 796 /* 797 * Purge or update corresponding prefix 798 * 799 * 1) we don't purge prefix here if address was not permanent. 800 * prefix is managed by its own lifetime. 801 * 2) if there're no addresses, delete prefix. 802 * 3) if there're still other permanent address(es), 803 * corresponding prefix is still permanent. 804 * 4) otherwise, update prefix lifetime to the 805 * longest valid lifetime among the corresponding 806 * addresses on the device. 807 * Note: subsequent RA will update lifetime. 808 * 809 * --yoshfuji 810 */ 811 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 812 struct in6_addr prefix; 813 struct rt6_info *rt; 814 struct net *net = dev_net(ifp->idev->dev); 815 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 816 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 817 818 if (rt && addrconf_is_prefix_route(rt)) { 819 if (onlink == 0) { 820 ip6_del_rt(rt); 821 rt = NULL; 822 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 823 rt->rt6i_expires = expires; 824 rt->rt6i_flags |= RTF_EXPIRES; 825 } 826 } 827 dst_release(&rt->dst); 828 } 829 830 out: 831 in6_ifa_put(ifp); 832 } 833 834 #ifdef CONFIG_IPV6_PRIVACY 835 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 836 { 837 struct inet6_dev *idev = ifp->idev; 838 struct in6_addr addr, *tmpaddr; 839 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age; 840 unsigned long regen_advance; 841 int tmp_plen; 842 int ret = 0; 843 int max_addresses; 844 u32 addr_flags; 845 846 write_lock(&idev->lock); 847 if (ift) { 848 spin_lock_bh(&ift->lock); 849 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 850 spin_unlock_bh(&ift->lock); 851 tmpaddr = &addr; 852 } else { 853 tmpaddr = NULL; 854 } 855 retry: 856 in6_dev_hold(idev); 857 if (idev->cnf.use_tempaddr <= 0) { 858 write_unlock(&idev->lock); 859 printk(KERN_INFO 860 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 861 in6_dev_put(idev); 862 ret = -1; 863 goto out; 864 } 865 spin_lock_bh(&ifp->lock); 866 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 867 idev->cnf.use_tempaddr = -1; /*XXX*/ 868 spin_unlock_bh(&ifp->lock); 869 write_unlock(&idev->lock); 870 printk(KERN_WARNING 871 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 872 in6_dev_put(idev); 873 ret = -1; 874 goto out; 875 } 876 in6_ifa_hold(ifp); 877 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 878 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 879 spin_unlock_bh(&ifp->lock); 880 write_unlock(&idev->lock); 881 printk(KERN_WARNING 882 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 883 in6_ifa_put(ifp); 884 in6_dev_put(idev); 885 ret = -1; 886 goto out; 887 } 888 memcpy(&addr.s6_addr[8], idev->rndid, 8); 889 age = (jiffies - ifp->tstamp) / HZ; 890 tmp_valid_lft = min_t(__u32, 891 ifp->valid_lft, 892 idev->cnf.temp_valid_lft + age); 893 tmp_prefered_lft = min_t(__u32, 894 ifp->prefered_lft, 895 idev->cnf.temp_prefered_lft + age - 896 idev->cnf.max_desync_factor); 897 tmp_plen = ifp->prefix_len; 898 max_addresses = idev->cnf.max_addresses; 899 tmp_cstamp = ifp->cstamp; 900 tmp_tstamp = ifp->tstamp; 901 spin_unlock_bh(&ifp->lock); 902 903 regen_advance = idev->cnf.regen_max_retry * 904 idev->cnf.dad_transmits * 905 idev->nd_parms->retrans_time / HZ; 906 write_unlock(&idev->lock); 907 908 /* A temporary address is created only if this calculated Preferred 909 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 910 * an implementation must not create a temporary address with a zero 911 * Preferred Lifetime. 912 */ 913 if (tmp_prefered_lft <= regen_advance) { 914 in6_ifa_put(ifp); 915 in6_dev_put(idev); 916 ret = -1; 917 goto out; 918 } 919 920 addr_flags = IFA_F_TEMPORARY; 921 /* set in addrconf_prefix_rcv() */ 922 if (ifp->flags & IFA_F_OPTIMISTIC) 923 addr_flags |= IFA_F_OPTIMISTIC; 924 925 ift = !max_addresses || 926 ipv6_count_addresses(idev) < max_addresses ? 927 ipv6_add_addr(idev, &addr, tmp_plen, 928 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 929 addr_flags) : NULL; 930 if (!ift || IS_ERR(ift)) { 931 in6_ifa_put(ifp); 932 in6_dev_put(idev); 933 printk(KERN_INFO 934 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 935 tmpaddr = &addr; 936 write_lock(&idev->lock); 937 goto retry; 938 } 939 940 spin_lock_bh(&ift->lock); 941 ift->ifpub = ifp; 942 ift->valid_lft = tmp_valid_lft; 943 ift->prefered_lft = tmp_prefered_lft; 944 ift->cstamp = tmp_cstamp; 945 ift->tstamp = tmp_tstamp; 946 spin_unlock_bh(&ift->lock); 947 948 addrconf_dad_start(ift, 0); 949 in6_ifa_put(ift); 950 in6_dev_put(idev); 951 out: 952 return ret; 953 } 954 #endif 955 956 /* 957 * Choose an appropriate source address (RFC3484) 958 */ 959 enum { 960 IPV6_SADDR_RULE_INIT = 0, 961 IPV6_SADDR_RULE_LOCAL, 962 IPV6_SADDR_RULE_SCOPE, 963 IPV6_SADDR_RULE_PREFERRED, 964 #ifdef CONFIG_IPV6_MIP6 965 IPV6_SADDR_RULE_HOA, 966 #endif 967 IPV6_SADDR_RULE_OIF, 968 IPV6_SADDR_RULE_LABEL, 969 #ifdef CONFIG_IPV6_PRIVACY 970 IPV6_SADDR_RULE_PRIVACY, 971 #endif 972 IPV6_SADDR_RULE_ORCHID, 973 IPV6_SADDR_RULE_PREFIX, 974 IPV6_SADDR_RULE_MAX 975 }; 976 977 struct ipv6_saddr_score { 978 int rule; 979 int addr_type; 980 struct inet6_ifaddr *ifa; 981 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 982 int scopedist; 983 int matchlen; 984 }; 985 986 struct ipv6_saddr_dst { 987 const struct in6_addr *addr; 988 int ifindex; 989 int scope; 990 int label; 991 unsigned int prefs; 992 }; 993 994 static inline int ipv6_saddr_preferred(int type) 995 { 996 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 997 return 1; 998 return 0; 999 } 1000 1001 static int ipv6_get_saddr_eval(struct net *net, 1002 struct ipv6_saddr_score *score, 1003 struct ipv6_saddr_dst *dst, 1004 int i) 1005 { 1006 int ret; 1007 1008 if (i <= score->rule) { 1009 switch (i) { 1010 case IPV6_SADDR_RULE_SCOPE: 1011 ret = score->scopedist; 1012 break; 1013 case IPV6_SADDR_RULE_PREFIX: 1014 ret = score->matchlen; 1015 break; 1016 default: 1017 ret = !!test_bit(i, score->scorebits); 1018 } 1019 goto out; 1020 } 1021 1022 switch (i) { 1023 case IPV6_SADDR_RULE_INIT: 1024 /* Rule 0: remember if hiscore is not ready yet */ 1025 ret = !!score->ifa; 1026 break; 1027 case IPV6_SADDR_RULE_LOCAL: 1028 /* Rule 1: Prefer same address */ 1029 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1030 break; 1031 case IPV6_SADDR_RULE_SCOPE: 1032 /* Rule 2: Prefer appropriate scope 1033 * 1034 * ret 1035 * ^ 1036 * -1 | d 15 1037 * ---+--+-+---> scope 1038 * | 1039 * | d is scope of the destination. 1040 * B-d | \ 1041 * | \ <- smaller scope is better if 1042 * B-15 | \ if scope is enough for destinaion. 1043 * | ret = B - scope (-1 <= scope >= d <= 15). 1044 * d-C-1 | / 1045 * |/ <- greater is better 1046 * -C / if scope is not enough for destination. 1047 * /| ret = scope - C (-1 <= d < scope <= 15). 1048 * 1049 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1050 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1051 * Assume B = 0 and we get C > 29. 1052 */ 1053 ret = __ipv6_addr_src_scope(score->addr_type); 1054 if (ret >= dst->scope) 1055 ret = -ret; 1056 else 1057 ret -= 128; /* 30 is enough */ 1058 score->scopedist = ret; 1059 break; 1060 case IPV6_SADDR_RULE_PREFERRED: 1061 /* Rule 3: Avoid deprecated and optimistic addresses */ 1062 ret = ipv6_saddr_preferred(score->addr_type) || 1063 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1064 break; 1065 #ifdef CONFIG_IPV6_MIP6 1066 case IPV6_SADDR_RULE_HOA: 1067 { 1068 /* Rule 4: Prefer home address */ 1069 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1070 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1071 break; 1072 } 1073 #endif 1074 case IPV6_SADDR_RULE_OIF: 1075 /* Rule 5: Prefer outgoing interface */ 1076 ret = (!dst->ifindex || 1077 dst->ifindex == score->ifa->idev->dev->ifindex); 1078 break; 1079 case IPV6_SADDR_RULE_LABEL: 1080 /* Rule 6: Prefer matching label */ 1081 ret = ipv6_addr_label(net, 1082 &score->ifa->addr, score->addr_type, 1083 score->ifa->idev->dev->ifindex) == dst->label; 1084 break; 1085 #ifdef CONFIG_IPV6_PRIVACY 1086 case IPV6_SADDR_RULE_PRIVACY: 1087 { 1088 /* Rule 7: Prefer public address 1089 * Note: prefer temprary address if use_tempaddr >= 2 1090 */ 1091 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1092 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1093 score->ifa->idev->cnf.use_tempaddr >= 2; 1094 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1095 break; 1096 } 1097 #endif 1098 case IPV6_SADDR_RULE_ORCHID: 1099 /* Rule 8-: Prefer ORCHID vs ORCHID or 1100 * non-ORCHID vs non-ORCHID 1101 */ 1102 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1103 ipv6_addr_orchid(dst->addr)); 1104 break; 1105 case IPV6_SADDR_RULE_PREFIX: 1106 /* Rule 8: Use longest matching prefix */ 1107 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1108 dst->addr); 1109 break; 1110 default: 1111 ret = 0; 1112 } 1113 1114 if (ret) 1115 __set_bit(i, score->scorebits); 1116 score->rule = i; 1117 out: 1118 return ret; 1119 } 1120 1121 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1122 const struct in6_addr *daddr, unsigned int prefs, 1123 struct in6_addr *saddr) 1124 { 1125 struct ipv6_saddr_score scores[2], 1126 *score = &scores[0], *hiscore = &scores[1]; 1127 struct ipv6_saddr_dst dst; 1128 struct net_device *dev; 1129 int dst_type; 1130 1131 dst_type = __ipv6_addr_type(daddr); 1132 dst.addr = daddr; 1133 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1134 dst.scope = __ipv6_addr_src_scope(dst_type); 1135 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1136 dst.prefs = prefs; 1137 1138 hiscore->rule = -1; 1139 hiscore->ifa = NULL; 1140 1141 rcu_read_lock(); 1142 1143 for_each_netdev_rcu(net, dev) { 1144 struct inet6_dev *idev; 1145 1146 /* Candidate Source Address (section 4) 1147 * - multicast and link-local destination address, 1148 * the set of candidate source address MUST only 1149 * include addresses assigned to interfaces 1150 * belonging to the same link as the outgoing 1151 * interface. 1152 * (- For site-local destination addresses, the 1153 * set of candidate source addresses MUST only 1154 * include addresses assigned to interfaces 1155 * belonging to the same site as the outgoing 1156 * interface.) 1157 */ 1158 if (((dst_type & IPV6_ADDR_MULTICAST) || 1159 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1160 dst.ifindex && dev->ifindex != dst.ifindex) 1161 continue; 1162 1163 idev = __in6_dev_get(dev); 1164 if (!idev) 1165 continue; 1166 1167 read_lock_bh(&idev->lock); 1168 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1169 int i; 1170 1171 /* 1172 * - Tentative Address (RFC2462 section 5.4) 1173 * - A tentative address is not considered 1174 * "assigned to an interface" in the traditional 1175 * sense, unless it is also flagged as optimistic. 1176 * - Candidate Source Address (section 4) 1177 * - In any case, anycast addresses, multicast 1178 * addresses, and the unspecified address MUST 1179 * NOT be included in a candidate set. 1180 */ 1181 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1182 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1183 continue; 1184 1185 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1186 1187 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1188 score->addr_type & IPV6_ADDR_MULTICAST)) { 1189 LIMIT_NETDEBUG(KERN_DEBUG 1190 "ADDRCONF: unspecified / multicast address " 1191 "assigned as unicast address on %s", 1192 dev->name); 1193 continue; 1194 } 1195 1196 score->rule = -1; 1197 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1198 1199 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1200 int minihiscore, miniscore; 1201 1202 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1203 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1204 1205 if (minihiscore > miniscore) { 1206 if (i == IPV6_SADDR_RULE_SCOPE && 1207 score->scopedist > 0) { 1208 /* 1209 * special case: 1210 * each remaining entry 1211 * has too small (not enough) 1212 * scope, because ifa entries 1213 * are sorted by their scope 1214 * values. 1215 */ 1216 goto try_nextdev; 1217 } 1218 break; 1219 } else if (minihiscore < miniscore) { 1220 if (hiscore->ifa) 1221 in6_ifa_put(hiscore->ifa); 1222 1223 in6_ifa_hold(score->ifa); 1224 1225 swap(hiscore, score); 1226 1227 /* restore our iterator */ 1228 score->ifa = hiscore->ifa; 1229 1230 break; 1231 } 1232 } 1233 } 1234 try_nextdev: 1235 read_unlock_bh(&idev->lock); 1236 } 1237 rcu_read_unlock(); 1238 1239 if (!hiscore->ifa) 1240 return -EADDRNOTAVAIL; 1241 1242 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1243 in6_ifa_put(hiscore->ifa); 1244 return 0; 1245 } 1246 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1247 1248 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1249 unsigned char banned_flags) 1250 { 1251 struct inet6_dev *idev; 1252 int err = -EADDRNOTAVAIL; 1253 1254 rcu_read_lock(); 1255 idev = __in6_dev_get(dev); 1256 if (idev) { 1257 struct inet6_ifaddr *ifp; 1258 1259 read_lock_bh(&idev->lock); 1260 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1261 if (ifp->scope == IFA_LINK && 1262 !(ifp->flags & banned_flags)) { 1263 ipv6_addr_copy(addr, &ifp->addr); 1264 err = 0; 1265 break; 1266 } 1267 } 1268 read_unlock_bh(&idev->lock); 1269 } 1270 rcu_read_unlock(); 1271 return err; 1272 } 1273 1274 static int ipv6_count_addresses(struct inet6_dev *idev) 1275 { 1276 int cnt = 0; 1277 struct inet6_ifaddr *ifp; 1278 1279 read_lock_bh(&idev->lock); 1280 list_for_each_entry(ifp, &idev->addr_list, if_list) 1281 cnt++; 1282 read_unlock_bh(&idev->lock); 1283 return cnt; 1284 } 1285 1286 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1287 struct net_device *dev, int strict) 1288 { 1289 struct inet6_ifaddr *ifp; 1290 struct hlist_node *node; 1291 unsigned int hash = ipv6_addr_hash(addr); 1292 1293 rcu_read_lock_bh(); 1294 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1295 if (!net_eq(dev_net(ifp->idev->dev), net)) 1296 continue; 1297 if (ipv6_addr_equal(&ifp->addr, addr) && 1298 !(ifp->flags&IFA_F_TENTATIVE) && 1299 (dev == NULL || ifp->idev->dev == dev || 1300 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1301 rcu_read_unlock_bh(); 1302 return 1; 1303 } 1304 } 1305 1306 rcu_read_unlock_bh(); 1307 return 0; 1308 } 1309 EXPORT_SYMBOL(ipv6_chk_addr); 1310 1311 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1312 struct net_device *dev) 1313 { 1314 unsigned int hash = ipv6_addr_hash(addr); 1315 struct inet6_ifaddr *ifp; 1316 struct hlist_node *node; 1317 1318 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1319 if (!net_eq(dev_net(ifp->idev->dev), net)) 1320 continue; 1321 if (ipv6_addr_equal(&ifp->addr, addr)) { 1322 if (dev == NULL || ifp->idev->dev == dev) 1323 return true; 1324 } 1325 } 1326 return false; 1327 } 1328 1329 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1330 { 1331 struct inet6_dev *idev; 1332 struct inet6_ifaddr *ifa; 1333 int onlink; 1334 1335 onlink = 0; 1336 rcu_read_lock(); 1337 idev = __in6_dev_get(dev); 1338 if (idev) { 1339 read_lock_bh(&idev->lock); 1340 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1341 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1342 ifa->prefix_len); 1343 if (onlink) 1344 break; 1345 } 1346 read_unlock_bh(&idev->lock); 1347 } 1348 rcu_read_unlock(); 1349 return onlink; 1350 } 1351 1352 EXPORT_SYMBOL(ipv6_chk_prefix); 1353 1354 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1355 struct net_device *dev, int strict) 1356 { 1357 struct inet6_ifaddr *ifp, *result = NULL; 1358 unsigned int hash = ipv6_addr_hash(addr); 1359 struct hlist_node *node; 1360 1361 rcu_read_lock_bh(); 1362 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1363 if (!net_eq(dev_net(ifp->idev->dev), net)) 1364 continue; 1365 if (ipv6_addr_equal(&ifp->addr, addr)) { 1366 if (dev == NULL || ifp->idev->dev == dev || 1367 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1368 result = ifp; 1369 in6_ifa_hold(ifp); 1370 break; 1371 } 1372 } 1373 } 1374 rcu_read_unlock_bh(); 1375 1376 return result; 1377 } 1378 1379 /* Gets referenced address, destroys ifaddr */ 1380 1381 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1382 { 1383 if (ifp->flags&IFA_F_PERMANENT) { 1384 spin_lock_bh(&ifp->lock); 1385 addrconf_del_timer(ifp); 1386 ifp->flags |= IFA_F_TENTATIVE; 1387 if (dad_failed) 1388 ifp->flags |= IFA_F_DADFAILED; 1389 spin_unlock_bh(&ifp->lock); 1390 if (dad_failed) 1391 ipv6_ifa_notify(0, ifp); 1392 in6_ifa_put(ifp); 1393 #ifdef CONFIG_IPV6_PRIVACY 1394 } else if (ifp->flags&IFA_F_TEMPORARY) { 1395 struct inet6_ifaddr *ifpub; 1396 spin_lock_bh(&ifp->lock); 1397 ifpub = ifp->ifpub; 1398 if (ifpub) { 1399 in6_ifa_hold(ifpub); 1400 spin_unlock_bh(&ifp->lock); 1401 ipv6_create_tempaddr(ifpub, ifp); 1402 in6_ifa_put(ifpub); 1403 } else { 1404 spin_unlock_bh(&ifp->lock); 1405 } 1406 ipv6_del_addr(ifp); 1407 #endif 1408 } else 1409 ipv6_del_addr(ifp); 1410 } 1411 1412 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1413 { 1414 int err = -ENOENT; 1415 1416 spin_lock(&ifp->state_lock); 1417 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1418 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1419 err = 0; 1420 } 1421 spin_unlock(&ifp->state_lock); 1422 1423 return err; 1424 } 1425 1426 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1427 { 1428 struct inet6_dev *idev = ifp->idev; 1429 1430 if (addrconf_dad_end(ifp)) { 1431 in6_ifa_put(ifp); 1432 return; 1433 } 1434 1435 if (net_ratelimit()) 1436 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1437 ifp->idev->dev->name, &ifp->addr); 1438 1439 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1440 struct in6_addr addr; 1441 1442 addr.s6_addr32[0] = htonl(0xfe800000); 1443 addr.s6_addr32[1] = 0; 1444 1445 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1446 ipv6_addr_equal(&ifp->addr, &addr)) { 1447 /* DAD failed for link-local based on MAC address */ 1448 idev->cnf.disable_ipv6 = 1; 1449 1450 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1451 ifp->idev->dev->name); 1452 } 1453 } 1454 1455 addrconf_dad_stop(ifp, 1); 1456 } 1457 1458 /* Join to solicited addr multicast group. */ 1459 1460 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1461 { 1462 struct in6_addr maddr; 1463 1464 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1465 return; 1466 1467 addrconf_addr_solict_mult(addr, &maddr); 1468 ipv6_dev_mc_inc(dev, &maddr); 1469 } 1470 1471 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1472 { 1473 struct in6_addr maddr; 1474 1475 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1476 return; 1477 1478 addrconf_addr_solict_mult(addr, &maddr); 1479 __ipv6_dev_mc_dec(idev, &maddr); 1480 } 1481 1482 static void addrconf_join_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_inc(ifp->idev->dev, &addr); 1489 } 1490 1491 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1492 { 1493 struct in6_addr addr; 1494 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1495 if (ipv6_addr_any(&addr)) 1496 return; 1497 __ipv6_dev_ac_dec(ifp->idev, &addr); 1498 } 1499 1500 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1501 { 1502 if (dev->addr_len != ETH_ALEN) 1503 return -1; 1504 memcpy(eui, dev->dev_addr, 3); 1505 memcpy(eui + 5, dev->dev_addr + 3, 3); 1506 1507 /* 1508 * The zSeries OSA network cards can be shared among various 1509 * OS instances, but the OSA cards have only one MAC address. 1510 * This leads to duplicate address conflicts in conjunction 1511 * with IPv6 if more than one instance uses the same card. 1512 * 1513 * The driver for these cards can deliver a unique 16-bit 1514 * identifier for each instance sharing the same card. It is 1515 * placed instead of 0xFFFE in the interface identifier. The 1516 * "u" bit of the interface identifier is not inverted in this 1517 * case. Hence the resulting interface identifier has local 1518 * scope according to RFC2373. 1519 */ 1520 if (dev->dev_id) { 1521 eui[3] = (dev->dev_id >> 8) & 0xFF; 1522 eui[4] = dev->dev_id & 0xFF; 1523 } else { 1524 eui[3] = 0xFF; 1525 eui[4] = 0xFE; 1526 eui[0] ^= 2; 1527 } 1528 return 0; 1529 } 1530 1531 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1532 { 1533 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1534 if (dev->addr_len != ARCNET_ALEN) 1535 return -1; 1536 memset(eui, 0, 7); 1537 eui[7] = *(u8*)dev->dev_addr; 1538 return 0; 1539 } 1540 1541 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1542 { 1543 if (dev->addr_len != INFINIBAND_ALEN) 1544 return -1; 1545 memcpy(eui, dev->dev_addr + 12, 8); 1546 eui[0] |= 2; 1547 return 0; 1548 } 1549 1550 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1551 { 1552 if (addr == 0) 1553 return -1; 1554 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1555 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1556 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1557 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1558 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1559 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1560 eui[1] = 0; 1561 eui[2] = 0x5E; 1562 eui[3] = 0xFE; 1563 memcpy(eui + 4, &addr, 4); 1564 return 0; 1565 } 1566 1567 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1568 { 1569 if (dev->priv_flags & IFF_ISATAP) 1570 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1571 return -1; 1572 } 1573 1574 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1575 { 1576 switch (dev->type) { 1577 case ARPHRD_ETHER: 1578 case ARPHRD_FDDI: 1579 case ARPHRD_IEEE802_TR: 1580 return addrconf_ifid_eui48(eui, dev); 1581 case ARPHRD_ARCNET: 1582 return addrconf_ifid_arcnet(eui, dev); 1583 case ARPHRD_INFINIBAND: 1584 return addrconf_ifid_infiniband(eui, dev); 1585 case ARPHRD_SIT: 1586 return addrconf_ifid_sit(eui, dev); 1587 } 1588 return -1; 1589 } 1590 1591 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1592 { 1593 int err = -1; 1594 struct inet6_ifaddr *ifp; 1595 1596 read_lock_bh(&idev->lock); 1597 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1598 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1599 memcpy(eui, ifp->addr.s6_addr+8, 8); 1600 err = 0; 1601 break; 1602 } 1603 } 1604 read_unlock_bh(&idev->lock); 1605 return err; 1606 } 1607 1608 #ifdef CONFIG_IPV6_PRIVACY 1609 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1610 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1611 { 1612 regen: 1613 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1614 idev->rndid[0] &= ~0x02; 1615 1616 /* 1617 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1618 * check if generated address is not inappropriate 1619 * 1620 * - Reserved subnet anycast (RFC 2526) 1621 * 11111101 11....11 1xxxxxxx 1622 * - ISATAP (RFC4214) 6.1 1623 * 00-00-5E-FE-xx-xx-xx-xx 1624 * - value 0 1625 * - XXX: already assigned to an address on the device 1626 */ 1627 if (idev->rndid[0] == 0xfd && 1628 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1629 (idev->rndid[7]&0x80)) 1630 goto regen; 1631 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1632 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1633 goto regen; 1634 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1635 goto regen; 1636 } 1637 1638 return 0; 1639 } 1640 1641 static void ipv6_regen_rndid(unsigned long data) 1642 { 1643 struct inet6_dev *idev = (struct inet6_dev *) data; 1644 unsigned long expires; 1645 1646 rcu_read_lock_bh(); 1647 write_lock_bh(&idev->lock); 1648 1649 if (idev->dead) 1650 goto out; 1651 1652 if (__ipv6_regen_rndid(idev) < 0) 1653 goto out; 1654 1655 expires = jiffies + 1656 idev->cnf.temp_prefered_lft * HZ - 1657 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1658 idev->cnf.max_desync_factor * HZ; 1659 if (time_before(expires, jiffies)) { 1660 printk(KERN_WARNING 1661 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1662 idev->dev->name); 1663 goto out; 1664 } 1665 1666 if (!mod_timer(&idev->regen_timer, expires)) 1667 in6_dev_hold(idev); 1668 1669 out: 1670 write_unlock_bh(&idev->lock); 1671 rcu_read_unlock_bh(); 1672 in6_dev_put(idev); 1673 } 1674 1675 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1676 int ret = 0; 1677 1678 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1679 ret = __ipv6_regen_rndid(idev); 1680 return ret; 1681 } 1682 #endif 1683 1684 /* 1685 * Add prefix route. 1686 */ 1687 1688 static void 1689 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1690 unsigned long expires, u32 flags) 1691 { 1692 struct fib6_config cfg = { 1693 .fc_table = RT6_TABLE_PREFIX, 1694 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1695 .fc_ifindex = dev->ifindex, 1696 .fc_expires = expires, 1697 .fc_dst_len = plen, 1698 .fc_flags = RTF_UP | flags, 1699 .fc_nlinfo.nl_net = dev_net(dev), 1700 .fc_protocol = RTPROT_KERNEL, 1701 }; 1702 1703 ipv6_addr_copy(&cfg.fc_dst, pfx); 1704 1705 /* Prevent useless cloning on PtP SIT. 1706 This thing is done here expecting that the whole 1707 class of non-broadcast devices need not cloning. 1708 */ 1709 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1710 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1711 cfg.fc_flags |= RTF_NONEXTHOP; 1712 #endif 1713 1714 ip6_route_add(&cfg); 1715 } 1716 1717 /* Create "default" multicast route to the interface */ 1718 1719 static void addrconf_add_mroute(struct net_device *dev) 1720 { 1721 struct fib6_config cfg = { 1722 .fc_table = RT6_TABLE_LOCAL, 1723 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1724 .fc_ifindex = dev->ifindex, 1725 .fc_dst_len = 8, 1726 .fc_flags = RTF_UP, 1727 .fc_nlinfo.nl_net = dev_net(dev), 1728 }; 1729 1730 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1731 1732 ip6_route_add(&cfg); 1733 } 1734 1735 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1736 static void sit_route_add(struct net_device *dev) 1737 { 1738 struct fib6_config cfg = { 1739 .fc_table = RT6_TABLE_MAIN, 1740 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1741 .fc_ifindex = dev->ifindex, 1742 .fc_dst_len = 96, 1743 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1744 .fc_nlinfo.nl_net = dev_net(dev), 1745 }; 1746 1747 /* prefix length - 96 bits "::d.d.d.d" */ 1748 ip6_route_add(&cfg); 1749 } 1750 #endif 1751 1752 static void addrconf_add_lroute(struct net_device *dev) 1753 { 1754 struct in6_addr addr; 1755 1756 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1757 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1758 } 1759 1760 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1761 { 1762 struct inet6_dev *idev; 1763 1764 ASSERT_RTNL(); 1765 1766 idev = ipv6_find_idev(dev); 1767 if (!idev) 1768 return ERR_PTR(-ENOBUFS); 1769 1770 if (idev->cnf.disable_ipv6) 1771 return ERR_PTR(-EACCES); 1772 1773 /* Add default multicast route */ 1774 addrconf_add_mroute(dev); 1775 1776 /* Add link local route */ 1777 addrconf_add_lroute(dev); 1778 return idev; 1779 } 1780 1781 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1782 { 1783 struct prefix_info *pinfo; 1784 __u32 valid_lft; 1785 __u32 prefered_lft; 1786 int addr_type; 1787 struct inet6_dev *in6_dev; 1788 struct net *net = dev_net(dev); 1789 1790 pinfo = (struct prefix_info *) opt; 1791 1792 if (len < sizeof(struct prefix_info)) { 1793 ADBG(("addrconf: prefix option too short\n")); 1794 return; 1795 } 1796 1797 /* 1798 * Validation checks ([ADDRCONF], page 19) 1799 */ 1800 1801 addr_type = ipv6_addr_type(&pinfo->prefix); 1802 1803 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1804 return; 1805 1806 valid_lft = ntohl(pinfo->valid); 1807 prefered_lft = ntohl(pinfo->prefered); 1808 1809 if (prefered_lft > valid_lft) { 1810 if (net_ratelimit()) 1811 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1812 return; 1813 } 1814 1815 in6_dev = in6_dev_get(dev); 1816 1817 if (in6_dev == NULL) { 1818 if (net_ratelimit()) 1819 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1820 return; 1821 } 1822 1823 /* 1824 * Two things going on here: 1825 * 1) Add routes for on-link prefixes 1826 * 2) Configure prefixes with the auto flag set 1827 */ 1828 1829 if (pinfo->onlink) { 1830 struct rt6_info *rt; 1831 unsigned long rt_expires; 1832 1833 /* Avoid arithmetic overflow. Really, we could 1834 * save rt_expires in seconds, likely valid_lft, 1835 * but it would require division in fib gc, that it 1836 * not good. 1837 */ 1838 if (HZ > USER_HZ) 1839 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1840 else 1841 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1842 1843 if (addrconf_finite_timeout(rt_expires)) 1844 rt_expires *= HZ; 1845 1846 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1847 dev->ifindex, 1); 1848 1849 if (rt && addrconf_is_prefix_route(rt)) { 1850 /* Autoconf prefix route */ 1851 if (valid_lft == 0) { 1852 ip6_del_rt(rt); 1853 rt = NULL; 1854 } else if (addrconf_finite_timeout(rt_expires)) { 1855 /* not infinity */ 1856 rt->rt6i_expires = jiffies + rt_expires; 1857 rt->rt6i_flags |= RTF_EXPIRES; 1858 } else { 1859 rt->rt6i_flags &= ~RTF_EXPIRES; 1860 rt->rt6i_expires = 0; 1861 } 1862 } else if (valid_lft) { 1863 clock_t expires = 0; 1864 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1865 if (addrconf_finite_timeout(rt_expires)) { 1866 /* not infinity */ 1867 flags |= RTF_EXPIRES; 1868 expires = jiffies_to_clock_t(rt_expires); 1869 } 1870 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1871 dev, expires, flags); 1872 } 1873 if (rt) 1874 dst_release(&rt->dst); 1875 } 1876 1877 /* Try to figure out our local address for this prefix */ 1878 1879 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1880 struct inet6_ifaddr * ifp; 1881 struct in6_addr addr; 1882 int create = 0, update_lft = 0; 1883 1884 if (pinfo->prefix_len == 64) { 1885 memcpy(&addr, &pinfo->prefix, 8); 1886 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1887 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1888 in6_dev_put(in6_dev); 1889 return; 1890 } 1891 goto ok; 1892 } 1893 if (net_ratelimit()) 1894 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1895 pinfo->prefix_len); 1896 in6_dev_put(in6_dev); 1897 return; 1898 1899 ok: 1900 1901 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1902 1903 if (ifp == NULL && valid_lft) { 1904 int max_addresses = in6_dev->cnf.max_addresses; 1905 u32 addr_flags = 0; 1906 1907 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1908 if (in6_dev->cnf.optimistic_dad && 1909 !net->ipv6.devconf_all->forwarding) 1910 addr_flags = IFA_F_OPTIMISTIC; 1911 #endif 1912 1913 /* Do not allow to create too much of autoconfigured 1914 * addresses; this would be too easy way to crash kernel. 1915 */ 1916 if (!max_addresses || 1917 ipv6_count_addresses(in6_dev) < max_addresses) 1918 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1919 addr_type&IPV6_ADDR_SCOPE_MASK, 1920 addr_flags); 1921 1922 if (!ifp || IS_ERR(ifp)) { 1923 in6_dev_put(in6_dev); 1924 return; 1925 } 1926 1927 update_lft = create = 1; 1928 ifp->cstamp = jiffies; 1929 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1930 } 1931 1932 if (ifp) { 1933 int flags; 1934 unsigned long now; 1935 #ifdef CONFIG_IPV6_PRIVACY 1936 struct inet6_ifaddr *ift; 1937 #endif 1938 u32 stored_lft; 1939 1940 /* update lifetime (RFC2462 5.5.3 e) */ 1941 spin_lock(&ifp->lock); 1942 now = jiffies; 1943 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1944 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1945 else 1946 stored_lft = 0; 1947 if (!update_lft && stored_lft) { 1948 if (valid_lft > MIN_VALID_LIFETIME || 1949 valid_lft > stored_lft) 1950 update_lft = 1; 1951 else if (stored_lft <= MIN_VALID_LIFETIME) { 1952 /* valid_lft <= stored_lft is always true */ 1953 /* 1954 * RFC 4862 Section 5.5.3e: 1955 * "Note that the preferred lifetime of 1956 * the corresponding address is always 1957 * reset to the Preferred Lifetime in 1958 * the received Prefix Information 1959 * option, regardless of whether the 1960 * valid lifetime is also reset or 1961 * ignored." 1962 * 1963 * So if the preferred lifetime in 1964 * this advertisement is different 1965 * than what we have stored, but the 1966 * valid lifetime is invalid, just 1967 * reset prefered_lft. 1968 * 1969 * We must set the valid lifetime 1970 * to the stored lifetime since we'll 1971 * be updating the timestamp below, 1972 * else we'll set it back to the 1973 * minumum. 1974 */ 1975 if (prefered_lft != ifp->prefered_lft) { 1976 valid_lft = stored_lft; 1977 update_lft = 1; 1978 } 1979 } else { 1980 valid_lft = MIN_VALID_LIFETIME; 1981 if (valid_lft < prefered_lft) 1982 prefered_lft = valid_lft; 1983 update_lft = 1; 1984 } 1985 } 1986 1987 if (update_lft) { 1988 ifp->valid_lft = valid_lft; 1989 ifp->prefered_lft = prefered_lft; 1990 ifp->tstamp = now; 1991 flags = ifp->flags; 1992 ifp->flags &= ~IFA_F_DEPRECATED; 1993 spin_unlock(&ifp->lock); 1994 1995 if (!(flags&IFA_F_TENTATIVE)) 1996 ipv6_ifa_notify(0, ifp); 1997 } else 1998 spin_unlock(&ifp->lock); 1999 2000 #ifdef CONFIG_IPV6_PRIVACY 2001 read_lock_bh(&in6_dev->lock); 2002 /* update all temporary addresses in the list */ 2003 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) { 2004 /* 2005 * When adjusting the lifetimes of an existing 2006 * temporary address, only lower the lifetimes. 2007 * Implementations must not increase the 2008 * lifetimes of an existing temporary address 2009 * when processing a Prefix Information Option. 2010 */ 2011 if (ifp != ift->ifpub) 2012 continue; 2013 2014 spin_lock(&ift->lock); 2015 flags = ift->flags; 2016 if (ift->valid_lft > valid_lft && 2017 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 2018 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 2019 if (ift->prefered_lft > prefered_lft && 2020 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 2021 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 2022 spin_unlock(&ift->lock); 2023 if (!(flags&IFA_F_TENTATIVE)) 2024 ipv6_ifa_notify(0, ift); 2025 } 2026 2027 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2028 /* 2029 * When a new public address is created as described in [ADDRCONF], 2030 * also create a new temporary address. Also create a temporary 2031 * address if it's enabled but no temporary address currently exists. 2032 */ 2033 read_unlock_bh(&in6_dev->lock); 2034 ipv6_create_tempaddr(ifp, NULL); 2035 } else { 2036 read_unlock_bh(&in6_dev->lock); 2037 } 2038 #endif 2039 in6_ifa_put(ifp); 2040 addrconf_verify(0); 2041 } 2042 } 2043 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2044 in6_dev_put(in6_dev); 2045 } 2046 2047 /* 2048 * Set destination address. 2049 * Special case for SIT interfaces where we create a new "virtual" 2050 * device. 2051 */ 2052 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2053 { 2054 struct in6_ifreq ireq; 2055 struct net_device *dev; 2056 int err = -EINVAL; 2057 2058 rtnl_lock(); 2059 2060 err = -EFAULT; 2061 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2062 goto err_exit; 2063 2064 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2065 2066 err = -ENODEV; 2067 if (dev == NULL) 2068 goto err_exit; 2069 2070 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2071 if (dev->type == ARPHRD_SIT) { 2072 const struct net_device_ops *ops = dev->netdev_ops; 2073 struct ifreq ifr; 2074 struct ip_tunnel_parm p; 2075 2076 err = -EADDRNOTAVAIL; 2077 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2078 goto err_exit; 2079 2080 memset(&p, 0, sizeof(p)); 2081 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2082 p.iph.saddr = 0; 2083 p.iph.version = 4; 2084 p.iph.ihl = 5; 2085 p.iph.protocol = IPPROTO_IPV6; 2086 p.iph.ttl = 64; 2087 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2088 2089 if (ops->ndo_do_ioctl) { 2090 mm_segment_t oldfs = get_fs(); 2091 2092 set_fs(KERNEL_DS); 2093 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2094 set_fs(oldfs); 2095 } else 2096 err = -EOPNOTSUPP; 2097 2098 if (err == 0) { 2099 err = -ENOBUFS; 2100 dev = __dev_get_by_name(net, p.name); 2101 if (!dev) 2102 goto err_exit; 2103 err = dev_open(dev); 2104 } 2105 } 2106 #endif 2107 2108 err_exit: 2109 rtnl_unlock(); 2110 return err; 2111 } 2112 2113 /* 2114 * Manual configuration of address on an interface 2115 */ 2116 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2117 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2118 __u32 valid_lft) 2119 { 2120 struct inet6_ifaddr *ifp; 2121 struct inet6_dev *idev; 2122 struct net_device *dev; 2123 int scope; 2124 u32 flags; 2125 clock_t expires; 2126 unsigned long timeout; 2127 2128 ASSERT_RTNL(); 2129 2130 if (plen > 128) 2131 return -EINVAL; 2132 2133 /* check the lifetime */ 2134 if (!valid_lft || prefered_lft > valid_lft) 2135 return -EINVAL; 2136 2137 dev = __dev_get_by_index(net, ifindex); 2138 if (!dev) 2139 return -ENODEV; 2140 2141 idev = addrconf_add_dev(dev); 2142 if (IS_ERR(idev)) 2143 return PTR_ERR(idev); 2144 2145 scope = ipv6_addr_scope(pfx); 2146 2147 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2148 if (addrconf_finite_timeout(timeout)) { 2149 expires = jiffies_to_clock_t(timeout * HZ); 2150 valid_lft = timeout; 2151 flags = RTF_EXPIRES; 2152 } else { 2153 expires = 0; 2154 flags = 0; 2155 ifa_flags |= IFA_F_PERMANENT; 2156 } 2157 2158 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2159 if (addrconf_finite_timeout(timeout)) { 2160 if (timeout == 0) 2161 ifa_flags |= IFA_F_DEPRECATED; 2162 prefered_lft = timeout; 2163 } 2164 2165 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2166 2167 if (!IS_ERR(ifp)) { 2168 spin_lock_bh(&ifp->lock); 2169 ifp->valid_lft = valid_lft; 2170 ifp->prefered_lft = prefered_lft; 2171 ifp->tstamp = jiffies; 2172 spin_unlock_bh(&ifp->lock); 2173 2174 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2175 expires, flags); 2176 /* 2177 * Note that section 3.1 of RFC 4429 indicates 2178 * that the Optimistic flag should not be set for 2179 * manually configured addresses 2180 */ 2181 addrconf_dad_start(ifp, 0); 2182 in6_ifa_put(ifp); 2183 addrconf_verify(0); 2184 return 0; 2185 } 2186 2187 return PTR_ERR(ifp); 2188 } 2189 2190 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2191 unsigned int plen) 2192 { 2193 struct inet6_ifaddr *ifp; 2194 struct inet6_dev *idev; 2195 struct net_device *dev; 2196 2197 if (plen > 128) 2198 return -EINVAL; 2199 2200 dev = __dev_get_by_index(net, ifindex); 2201 if (!dev) 2202 return -ENODEV; 2203 2204 if ((idev = __in6_dev_get(dev)) == NULL) 2205 return -ENXIO; 2206 2207 read_lock_bh(&idev->lock); 2208 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2209 if (ifp->prefix_len == plen && 2210 ipv6_addr_equal(pfx, &ifp->addr)) { 2211 in6_ifa_hold(ifp); 2212 read_unlock_bh(&idev->lock); 2213 2214 ipv6_del_addr(ifp); 2215 2216 /* If the last address is deleted administratively, 2217 disable IPv6 on this interface. 2218 */ 2219 if (list_empty(&idev->addr_list)) 2220 addrconf_ifdown(idev->dev, 1); 2221 return 0; 2222 } 2223 } 2224 read_unlock_bh(&idev->lock); 2225 return -EADDRNOTAVAIL; 2226 } 2227 2228 2229 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2230 { 2231 struct in6_ifreq ireq; 2232 int err; 2233 2234 if (!capable(CAP_NET_ADMIN)) 2235 return -EPERM; 2236 2237 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2238 return -EFAULT; 2239 2240 rtnl_lock(); 2241 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2242 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2243 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2244 rtnl_unlock(); 2245 return err; 2246 } 2247 2248 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2249 { 2250 struct in6_ifreq ireq; 2251 int err; 2252 2253 if (!capable(CAP_NET_ADMIN)) 2254 return -EPERM; 2255 2256 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2257 return -EFAULT; 2258 2259 rtnl_lock(); 2260 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2261 ireq.ifr6_prefixlen); 2262 rtnl_unlock(); 2263 return err; 2264 } 2265 2266 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2267 int plen, int scope) 2268 { 2269 struct inet6_ifaddr *ifp; 2270 2271 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2272 if (!IS_ERR(ifp)) { 2273 spin_lock_bh(&ifp->lock); 2274 ifp->flags &= ~IFA_F_TENTATIVE; 2275 spin_unlock_bh(&ifp->lock); 2276 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2277 in6_ifa_put(ifp); 2278 } 2279 } 2280 2281 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2282 static void sit_add_v4_addrs(struct inet6_dev *idev) 2283 { 2284 struct in6_addr addr; 2285 struct net_device *dev; 2286 struct net *net = dev_net(idev->dev); 2287 int scope; 2288 2289 ASSERT_RTNL(); 2290 2291 memset(&addr, 0, sizeof(struct in6_addr)); 2292 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2293 2294 if (idev->dev->flags&IFF_POINTOPOINT) { 2295 addr.s6_addr32[0] = htonl(0xfe800000); 2296 scope = IFA_LINK; 2297 } else { 2298 scope = IPV6_ADDR_COMPATv4; 2299 } 2300 2301 if (addr.s6_addr32[3]) { 2302 add_addr(idev, &addr, 128, scope); 2303 return; 2304 } 2305 2306 for_each_netdev(net, dev) { 2307 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2308 if (in_dev && (dev->flags & IFF_UP)) { 2309 struct in_ifaddr * ifa; 2310 2311 int flag = scope; 2312 2313 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2314 int plen; 2315 2316 addr.s6_addr32[3] = ifa->ifa_local; 2317 2318 if (ifa->ifa_scope == RT_SCOPE_LINK) 2319 continue; 2320 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2321 if (idev->dev->flags&IFF_POINTOPOINT) 2322 continue; 2323 flag |= IFA_HOST; 2324 } 2325 if (idev->dev->flags&IFF_POINTOPOINT) 2326 plen = 64; 2327 else 2328 plen = 96; 2329 2330 add_addr(idev, &addr, plen, flag); 2331 } 2332 } 2333 } 2334 } 2335 #endif 2336 2337 static void init_loopback(struct net_device *dev) 2338 { 2339 struct inet6_dev *idev; 2340 2341 /* ::1 */ 2342 2343 ASSERT_RTNL(); 2344 2345 if ((idev = ipv6_find_idev(dev)) == NULL) { 2346 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2347 return; 2348 } 2349 2350 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2351 } 2352 2353 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2354 { 2355 struct inet6_ifaddr * ifp; 2356 u32 addr_flags = IFA_F_PERMANENT; 2357 2358 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2359 if (idev->cnf.optimistic_dad && 2360 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2361 addr_flags |= IFA_F_OPTIMISTIC; 2362 #endif 2363 2364 2365 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2366 if (!IS_ERR(ifp)) { 2367 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2368 addrconf_dad_start(ifp, 0); 2369 in6_ifa_put(ifp); 2370 } 2371 } 2372 2373 static void addrconf_dev_config(struct net_device *dev) 2374 { 2375 struct in6_addr addr; 2376 struct inet6_dev * idev; 2377 2378 ASSERT_RTNL(); 2379 2380 if ((dev->type != ARPHRD_ETHER) && 2381 (dev->type != ARPHRD_FDDI) && 2382 (dev->type != ARPHRD_IEEE802_TR) && 2383 (dev->type != ARPHRD_ARCNET) && 2384 (dev->type != ARPHRD_INFINIBAND)) { 2385 /* Alas, we support only Ethernet autoconfiguration. */ 2386 return; 2387 } 2388 2389 idev = addrconf_add_dev(dev); 2390 if (IS_ERR(idev)) 2391 return; 2392 2393 memset(&addr, 0, sizeof(struct in6_addr)); 2394 addr.s6_addr32[0] = htonl(0xFE800000); 2395 2396 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2397 addrconf_add_linklocal(idev, &addr); 2398 } 2399 2400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2401 static void addrconf_sit_config(struct net_device *dev) 2402 { 2403 struct inet6_dev *idev; 2404 2405 ASSERT_RTNL(); 2406 2407 /* 2408 * Configure the tunnel with one of our IPv4 2409 * addresses... we should configure all of 2410 * our v4 addrs in the tunnel 2411 */ 2412 2413 if ((idev = ipv6_find_idev(dev)) == NULL) { 2414 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2415 return; 2416 } 2417 2418 if (dev->priv_flags & IFF_ISATAP) { 2419 struct in6_addr addr; 2420 2421 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2422 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2423 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2424 addrconf_add_linklocal(idev, &addr); 2425 return; 2426 } 2427 2428 sit_add_v4_addrs(idev); 2429 2430 if (dev->flags&IFF_POINTOPOINT) { 2431 addrconf_add_mroute(dev); 2432 addrconf_add_lroute(dev); 2433 } else 2434 sit_route_add(dev); 2435 } 2436 #endif 2437 2438 static inline int 2439 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2440 { 2441 struct in6_addr lladdr; 2442 2443 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2444 addrconf_add_linklocal(idev, &lladdr); 2445 return 0; 2446 } 2447 return -1; 2448 } 2449 2450 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2451 { 2452 struct net_device *link_dev; 2453 struct net *net = dev_net(idev->dev); 2454 2455 /* first try to inherit the link-local address from the link device */ 2456 if (idev->dev->iflink && 2457 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2458 if (!ipv6_inherit_linklocal(idev, link_dev)) 2459 return; 2460 } 2461 /* then try to inherit it from any device */ 2462 for_each_netdev(net, link_dev) { 2463 if (!ipv6_inherit_linklocal(idev, link_dev)) 2464 return; 2465 } 2466 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2467 } 2468 2469 /* 2470 * Autoconfigure tunnel with a link-local address so routing protocols, 2471 * DHCPv6, MLD etc. can be run over the virtual link 2472 */ 2473 2474 static void addrconf_ip6_tnl_config(struct net_device *dev) 2475 { 2476 struct inet6_dev *idev; 2477 2478 ASSERT_RTNL(); 2479 2480 idev = addrconf_add_dev(dev); 2481 if (IS_ERR(idev)) { 2482 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2483 return; 2484 } 2485 ip6_tnl_add_linklocal(idev); 2486 } 2487 2488 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2489 void * data) 2490 { 2491 struct net_device *dev = (struct net_device *) data; 2492 struct inet6_dev *idev = __in6_dev_get(dev); 2493 int run_pending = 0; 2494 int err; 2495 2496 switch (event) { 2497 case NETDEV_REGISTER: 2498 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2499 idev = ipv6_add_dev(dev); 2500 if (!idev) 2501 return notifier_from_errno(-ENOMEM); 2502 } 2503 break; 2504 2505 case NETDEV_UP: 2506 case NETDEV_CHANGE: 2507 if (dev->flags & IFF_SLAVE) 2508 break; 2509 2510 if (event == NETDEV_UP) { 2511 if (!addrconf_qdisc_ok(dev)) { 2512 /* device is not ready yet. */ 2513 printk(KERN_INFO 2514 "ADDRCONF(NETDEV_UP): %s: " 2515 "link is not ready\n", 2516 dev->name); 2517 break; 2518 } 2519 2520 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2521 idev = ipv6_add_dev(dev); 2522 2523 if (idev) { 2524 idev->if_flags |= IF_READY; 2525 run_pending = 1; 2526 } 2527 } else { 2528 if (!addrconf_qdisc_ok(dev)) { 2529 /* device is still not ready. */ 2530 break; 2531 } 2532 2533 if (idev) { 2534 if (idev->if_flags & IF_READY) 2535 /* device is already configured. */ 2536 break; 2537 idev->if_flags |= IF_READY; 2538 } 2539 2540 printk(KERN_INFO 2541 "ADDRCONF(NETDEV_CHANGE): %s: " 2542 "link becomes ready\n", 2543 dev->name); 2544 2545 run_pending = 1; 2546 } 2547 2548 switch (dev->type) { 2549 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2550 case ARPHRD_SIT: 2551 addrconf_sit_config(dev); 2552 break; 2553 #endif 2554 case ARPHRD_TUNNEL6: 2555 addrconf_ip6_tnl_config(dev); 2556 break; 2557 case ARPHRD_LOOPBACK: 2558 init_loopback(dev); 2559 break; 2560 2561 default: 2562 addrconf_dev_config(dev); 2563 break; 2564 } 2565 2566 if (idev) { 2567 if (run_pending) 2568 addrconf_dad_run(idev); 2569 2570 /* 2571 * If the MTU changed during the interface down, 2572 * when the interface up, the changed MTU must be 2573 * reflected in the idev as well as routers. 2574 */ 2575 if (idev->cnf.mtu6 != dev->mtu && 2576 dev->mtu >= IPV6_MIN_MTU) { 2577 rt6_mtu_change(dev, dev->mtu); 2578 idev->cnf.mtu6 = dev->mtu; 2579 } 2580 idev->tstamp = jiffies; 2581 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2582 2583 /* 2584 * If the changed mtu during down is lower than 2585 * IPV6_MIN_MTU stop IPv6 on this interface. 2586 */ 2587 if (dev->mtu < IPV6_MIN_MTU) 2588 addrconf_ifdown(dev, 1); 2589 } 2590 break; 2591 2592 case NETDEV_CHANGEMTU: 2593 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2594 rt6_mtu_change(dev, dev->mtu); 2595 idev->cnf.mtu6 = dev->mtu; 2596 break; 2597 } 2598 2599 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2600 idev = ipv6_add_dev(dev); 2601 if (idev) 2602 break; 2603 } 2604 2605 /* 2606 * MTU falled under IPV6_MIN_MTU. 2607 * Stop IPv6 on this interface. 2608 */ 2609 2610 case NETDEV_DOWN: 2611 case NETDEV_UNREGISTER: 2612 /* 2613 * Remove all addresses from this interface. 2614 */ 2615 addrconf_ifdown(dev, event != NETDEV_DOWN); 2616 break; 2617 2618 case NETDEV_CHANGENAME: 2619 if (idev) { 2620 snmp6_unregister_dev(idev); 2621 addrconf_sysctl_unregister(idev); 2622 addrconf_sysctl_register(idev); 2623 err = snmp6_register_dev(idev); 2624 if (err) 2625 return notifier_from_errno(err); 2626 } 2627 break; 2628 2629 case NETDEV_PRE_TYPE_CHANGE: 2630 case NETDEV_POST_TYPE_CHANGE: 2631 addrconf_type_change(dev, event); 2632 break; 2633 } 2634 2635 return NOTIFY_OK; 2636 } 2637 2638 /* 2639 * addrconf module should be notified of a device going up 2640 */ 2641 static struct notifier_block ipv6_dev_notf = { 2642 .notifier_call = addrconf_notify, 2643 }; 2644 2645 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2646 { 2647 struct inet6_dev *idev; 2648 ASSERT_RTNL(); 2649 2650 idev = __in6_dev_get(dev); 2651 2652 if (event == NETDEV_POST_TYPE_CHANGE) 2653 ipv6_mc_remap(idev); 2654 else if (event == NETDEV_PRE_TYPE_CHANGE) 2655 ipv6_mc_unmap(idev); 2656 } 2657 2658 static int addrconf_ifdown(struct net_device *dev, int how) 2659 { 2660 struct net *net = dev_net(dev); 2661 struct inet6_dev *idev; 2662 struct inet6_ifaddr *ifa; 2663 LIST_HEAD(keep_list); 2664 int state; 2665 2666 ASSERT_RTNL(); 2667 2668 rt6_ifdown(net, dev); 2669 neigh_ifdown(&nd_tbl, dev); 2670 2671 idev = __in6_dev_get(dev); 2672 if (idev == NULL) 2673 return -ENODEV; 2674 2675 /* 2676 * Step 1: remove reference to ipv6 device from parent device. 2677 * Do not dev_put! 2678 */ 2679 if (how) { 2680 idev->dead = 1; 2681 2682 /* protected by rtnl_lock */ 2683 rcu_assign_pointer(dev->ip6_ptr, NULL); 2684 2685 /* Step 1.5: remove snmp6 entry */ 2686 snmp6_unregister_dev(idev); 2687 2688 } 2689 2690 write_lock_bh(&idev->lock); 2691 2692 /* Step 2: clear flags for stateless addrconf */ 2693 if (!how) 2694 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2695 2696 #ifdef CONFIG_IPV6_PRIVACY 2697 if (how && del_timer(&idev->regen_timer)) 2698 in6_dev_put(idev); 2699 2700 /* Step 3: clear tempaddr list */ 2701 while (!list_empty(&idev->tempaddr_list)) { 2702 ifa = list_first_entry(&idev->tempaddr_list, 2703 struct inet6_ifaddr, tmp_list); 2704 list_del(&ifa->tmp_list); 2705 write_unlock_bh(&idev->lock); 2706 spin_lock_bh(&ifa->lock); 2707 2708 if (ifa->ifpub) { 2709 in6_ifa_put(ifa->ifpub); 2710 ifa->ifpub = NULL; 2711 } 2712 spin_unlock_bh(&ifa->lock); 2713 in6_ifa_put(ifa); 2714 write_lock_bh(&idev->lock); 2715 } 2716 #endif 2717 2718 while (!list_empty(&idev->addr_list)) { 2719 ifa = list_first_entry(&idev->addr_list, 2720 struct inet6_ifaddr, if_list); 2721 addrconf_del_timer(ifa); 2722 2723 /* If just doing link down, and address is permanent 2724 and not link-local, then retain it. */ 2725 if (!how && 2726 (ifa->flags&IFA_F_PERMANENT) && 2727 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) { 2728 list_move_tail(&ifa->if_list, &keep_list); 2729 2730 /* If not doing DAD on this address, just keep it. */ 2731 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) || 2732 idev->cnf.accept_dad <= 0 || 2733 (ifa->flags & IFA_F_NODAD)) 2734 continue; 2735 2736 /* If it was tentative already, no need to notify */ 2737 if (ifa->flags & IFA_F_TENTATIVE) 2738 continue; 2739 2740 /* Flag it for later restoration when link comes up */ 2741 ifa->flags |= IFA_F_TENTATIVE; 2742 ifa->state = INET6_IFADDR_STATE_DAD; 2743 2744 write_unlock_bh(&idev->lock); 2745 2746 in6_ifa_hold(ifa); 2747 } else { 2748 list_del(&ifa->if_list); 2749 2750 /* clear hash table */ 2751 spin_lock_bh(&addrconf_hash_lock); 2752 hlist_del_init_rcu(&ifa->addr_lst); 2753 spin_unlock_bh(&addrconf_hash_lock); 2754 2755 write_unlock_bh(&idev->lock); 2756 spin_lock_bh(&ifa->state_lock); 2757 state = ifa->state; 2758 ifa->state = INET6_IFADDR_STATE_DEAD; 2759 spin_unlock_bh(&ifa->state_lock); 2760 2761 if (state == INET6_IFADDR_STATE_DEAD) 2762 goto put_ifa; 2763 } 2764 2765 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2766 if (ifa->state == INET6_IFADDR_STATE_DEAD) 2767 atomic_notifier_call_chain(&inet6addr_chain, 2768 NETDEV_DOWN, ifa); 2769 2770 put_ifa: 2771 in6_ifa_put(ifa); 2772 2773 write_lock_bh(&idev->lock); 2774 } 2775 2776 list_splice(&keep_list, &idev->addr_list); 2777 2778 write_unlock_bh(&idev->lock); 2779 2780 /* Step 5: Discard multicast list */ 2781 if (how) 2782 ipv6_mc_destroy_dev(idev); 2783 else 2784 ipv6_mc_down(idev); 2785 2786 idev->tstamp = jiffies; 2787 2788 /* Last: Shot the device (if unregistered) */ 2789 if (how) { 2790 addrconf_sysctl_unregister(idev); 2791 neigh_parms_release(&nd_tbl, idev->nd_parms); 2792 neigh_ifdown(&nd_tbl, dev); 2793 in6_dev_put(idev); 2794 } 2795 return 0; 2796 } 2797 2798 static void addrconf_rs_timer(unsigned long data) 2799 { 2800 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2801 struct inet6_dev *idev = ifp->idev; 2802 2803 read_lock(&idev->lock); 2804 if (idev->dead || !(idev->if_flags & IF_READY)) 2805 goto out; 2806 2807 if (idev->cnf.forwarding) 2808 goto out; 2809 2810 /* Announcement received after solicitation was sent */ 2811 if (idev->if_flags & IF_RA_RCVD) 2812 goto out; 2813 2814 spin_lock(&ifp->lock); 2815 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2816 /* The wait after the last probe can be shorter */ 2817 addrconf_mod_timer(ifp, AC_RS, 2818 (ifp->probes == idev->cnf.rtr_solicits) ? 2819 idev->cnf.rtr_solicit_delay : 2820 idev->cnf.rtr_solicit_interval); 2821 spin_unlock(&ifp->lock); 2822 2823 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2824 } else { 2825 spin_unlock(&ifp->lock); 2826 /* 2827 * Note: we do not support deprecated "all on-link" 2828 * assumption any longer. 2829 */ 2830 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2831 idev->dev->name); 2832 } 2833 2834 out: 2835 read_unlock(&idev->lock); 2836 in6_ifa_put(ifp); 2837 } 2838 2839 /* 2840 * Duplicate Address Detection 2841 */ 2842 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2843 { 2844 unsigned long rand_num; 2845 struct inet6_dev *idev = ifp->idev; 2846 2847 if (ifp->flags & IFA_F_OPTIMISTIC) 2848 rand_num = 0; 2849 else 2850 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2851 2852 ifp->probes = idev->cnf.dad_transmits; 2853 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2854 } 2855 2856 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2857 { 2858 struct inet6_dev *idev = ifp->idev; 2859 struct net_device *dev = idev->dev; 2860 2861 addrconf_join_solict(dev, &ifp->addr); 2862 2863 net_srandom(ifp->addr.s6_addr32[3]); 2864 2865 read_lock_bh(&idev->lock); 2866 spin_lock(&ifp->lock); 2867 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2868 goto out; 2869 2870 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2871 idev->cnf.accept_dad < 1 || 2872 !(ifp->flags&IFA_F_TENTATIVE) || 2873 ifp->flags & IFA_F_NODAD) { 2874 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2875 spin_unlock(&ifp->lock); 2876 read_unlock_bh(&idev->lock); 2877 2878 addrconf_dad_completed(ifp); 2879 return; 2880 } 2881 2882 if (!(idev->if_flags & IF_READY)) { 2883 spin_unlock(&ifp->lock); 2884 read_unlock_bh(&idev->lock); 2885 /* 2886 * If the device is not ready: 2887 * - keep it tentative if it is a permanent address. 2888 * - otherwise, kill it. 2889 */ 2890 in6_ifa_hold(ifp); 2891 addrconf_dad_stop(ifp, 0); 2892 return; 2893 } 2894 2895 /* 2896 * Optimistic nodes can start receiving 2897 * Frames right away 2898 */ 2899 if (ifp->flags & IFA_F_OPTIMISTIC) 2900 ip6_ins_rt(ifp->rt); 2901 2902 addrconf_dad_kick(ifp); 2903 out: 2904 spin_unlock(&ifp->lock); 2905 read_unlock_bh(&idev->lock); 2906 } 2907 2908 static void addrconf_dad_timer(unsigned long data) 2909 { 2910 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2911 struct inet6_dev *idev = ifp->idev; 2912 struct in6_addr mcaddr; 2913 2914 if (!ifp->probes && addrconf_dad_end(ifp)) 2915 goto out; 2916 2917 read_lock(&idev->lock); 2918 if (idev->dead || !(idev->if_flags & IF_READY)) { 2919 read_unlock(&idev->lock); 2920 goto out; 2921 } 2922 2923 spin_lock(&ifp->lock); 2924 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2925 spin_unlock(&ifp->lock); 2926 read_unlock(&idev->lock); 2927 goto out; 2928 } 2929 2930 if (ifp->probes == 0) { 2931 /* 2932 * DAD was successful 2933 */ 2934 2935 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2936 spin_unlock(&ifp->lock); 2937 read_unlock(&idev->lock); 2938 2939 addrconf_dad_completed(ifp); 2940 2941 goto out; 2942 } 2943 2944 ifp->probes--; 2945 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2946 spin_unlock(&ifp->lock); 2947 read_unlock(&idev->lock); 2948 2949 /* send a neighbour solicitation for our addr */ 2950 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2951 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2952 out: 2953 in6_ifa_put(ifp); 2954 } 2955 2956 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2957 { 2958 struct net_device *dev = ifp->idev->dev; 2959 2960 /* 2961 * Configure the address for reception. Now it is valid. 2962 */ 2963 2964 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2965 2966 /* If added prefix is link local and forwarding is off, 2967 start sending router solicitations. 2968 */ 2969 2970 if ((ifp->idev->cnf.forwarding == 0 || 2971 ifp->idev->cnf.forwarding == 2) && 2972 ifp->idev->cnf.rtr_solicits > 0 && 2973 (dev->flags&IFF_LOOPBACK) == 0 && 2974 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2975 /* 2976 * If a host as already performed a random delay 2977 * [...] as part of DAD [...] there is no need 2978 * to delay again before sending the first RS 2979 */ 2980 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2981 2982 spin_lock_bh(&ifp->lock); 2983 ifp->probes = 1; 2984 ifp->idev->if_flags |= IF_RS_SENT; 2985 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2986 spin_unlock_bh(&ifp->lock); 2987 } 2988 } 2989 2990 static void addrconf_dad_run(struct inet6_dev *idev) 2991 { 2992 struct inet6_ifaddr *ifp; 2993 2994 read_lock_bh(&idev->lock); 2995 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2996 spin_lock(&ifp->lock); 2997 if (ifp->flags & IFA_F_TENTATIVE && 2998 ifp->state == INET6_IFADDR_STATE_DAD) 2999 addrconf_dad_kick(ifp); 3000 spin_unlock(&ifp->lock); 3001 } 3002 read_unlock_bh(&idev->lock); 3003 } 3004 3005 #ifdef CONFIG_PROC_FS 3006 struct if6_iter_state { 3007 struct seq_net_private p; 3008 int bucket; 3009 }; 3010 3011 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 3012 { 3013 struct inet6_ifaddr *ifa = NULL; 3014 struct if6_iter_state *state = seq->private; 3015 struct net *net = seq_file_net(seq); 3016 3017 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3018 struct hlist_node *n; 3019 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3020 addr_lst) 3021 if (net_eq(dev_net(ifa->idev->dev), net)) 3022 return ifa; 3023 } 3024 return NULL; 3025 } 3026 3027 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3028 struct inet6_ifaddr *ifa) 3029 { 3030 struct if6_iter_state *state = seq->private; 3031 struct net *net = seq_file_net(seq); 3032 struct hlist_node *n = &ifa->addr_lst; 3033 3034 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) 3035 if (net_eq(dev_net(ifa->idev->dev), net)) 3036 return ifa; 3037 3038 while (++state->bucket < IN6_ADDR_HSIZE) { 3039 hlist_for_each_entry_rcu_bh(ifa, n, 3040 &inet6_addr_lst[state->bucket], addr_lst) { 3041 if (net_eq(dev_net(ifa->idev->dev), net)) 3042 return ifa; 3043 } 3044 } 3045 3046 return NULL; 3047 } 3048 3049 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3050 { 3051 struct inet6_ifaddr *ifa = if6_get_first(seq); 3052 3053 if (ifa) 3054 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3055 --pos; 3056 return pos ? NULL : ifa; 3057 } 3058 3059 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3060 __acquires(rcu_bh) 3061 { 3062 rcu_read_lock_bh(); 3063 return if6_get_idx(seq, *pos); 3064 } 3065 3066 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3067 { 3068 struct inet6_ifaddr *ifa; 3069 3070 ifa = if6_get_next(seq, v); 3071 ++*pos; 3072 return ifa; 3073 } 3074 3075 static void if6_seq_stop(struct seq_file *seq, void *v) 3076 __releases(rcu_bh) 3077 { 3078 rcu_read_unlock_bh(); 3079 } 3080 3081 static int if6_seq_show(struct seq_file *seq, void *v) 3082 { 3083 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3084 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3085 &ifp->addr, 3086 ifp->idev->dev->ifindex, 3087 ifp->prefix_len, 3088 ifp->scope, 3089 ifp->flags, 3090 ifp->idev->dev->name); 3091 return 0; 3092 } 3093 3094 static const struct seq_operations if6_seq_ops = { 3095 .start = if6_seq_start, 3096 .next = if6_seq_next, 3097 .show = if6_seq_show, 3098 .stop = if6_seq_stop, 3099 }; 3100 3101 static int if6_seq_open(struct inode *inode, struct file *file) 3102 { 3103 return seq_open_net(inode, file, &if6_seq_ops, 3104 sizeof(struct if6_iter_state)); 3105 } 3106 3107 static const struct file_operations if6_fops = { 3108 .owner = THIS_MODULE, 3109 .open = if6_seq_open, 3110 .read = seq_read, 3111 .llseek = seq_lseek, 3112 .release = seq_release_net, 3113 }; 3114 3115 static int __net_init if6_proc_net_init(struct net *net) 3116 { 3117 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3118 return -ENOMEM; 3119 return 0; 3120 } 3121 3122 static void __net_exit if6_proc_net_exit(struct net *net) 3123 { 3124 proc_net_remove(net, "if_inet6"); 3125 } 3126 3127 static struct pernet_operations if6_proc_net_ops = { 3128 .init = if6_proc_net_init, 3129 .exit = if6_proc_net_exit, 3130 }; 3131 3132 int __init if6_proc_init(void) 3133 { 3134 return register_pernet_subsys(&if6_proc_net_ops); 3135 } 3136 3137 void if6_proc_exit(void) 3138 { 3139 unregister_pernet_subsys(&if6_proc_net_ops); 3140 } 3141 #endif /* CONFIG_PROC_FS */ 3142 3143 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3144 /* Check if address is a home address configured on any interface. */ 3145 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3146 { 3147 int ret = 0; 3148 struct inet6_ifaddr *ifp = NULL; 3149 struct hlist_node *n; 3150 unsigned int hash = ipv6_addr_hash(addr); 3151 3152 rcu_read_lock_bh(); 3153 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3154 if (!net_eq(dev_net(ifp->idev->dev), net)) 3155 continue; 3156 if (ipv6_addr_equal(&ifp->addr, addr) && 3157 (ifp->flags & IFA_F_HOMEADDRESS)) { 3158 ret = 1; 3159 break; 3160 } 3161 } 3162 rcu_read_unlock_bh(); 3163 return ret; 3164 } 3165 #endif 3166 3167 /* 3168 * Periodic address status verification 3169 */ 3170 3171 static void addrconf_verify(unsigned long foo) 3172 { 3173 unsigned long now, next, next_sec, next_sched; 3174 struct inet6_ifaddr *ifp; 3175 struct hlist_node *node; 3176 int i; 3177 3178 rcu_read_lock_bh(); 3179 spin_lock(&addrconf_verify_lock); 3180 now = jiffies; 3181 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3182 3183 del_timer(&addr_chk_timer); 3184 3185 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3186 restart: 3187 hlist_for_each_entry_rcu_bh(ifp, node, 3188 &inet6_addr_lst[i], addr_lst) { 3189 unsigned long age; 3190 3191 if (ifp->flags & IFA_F_PERMANENT) 3192 continue; 3193 3194 spin_lock(&ifp->lock); 3195 /* We try to batch several events at once. */ 3196 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3197 3198 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3199 age >= ifp->valid_lft) { 3200 spin_unlock(&ifp->lock); 3201 in6_ifa_hold(ifp); 3202 ipv6_del_addr(ifp); 3203 goto restart; 3204 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3205 spin_unlock(&ifp->lock); 3206 continue; 3207 } else if (age >= ifp->prefered_lft) { 3208 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3209 int deprecate = 0; 3210 3211 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3212 deprecate = 1; 3213 ifp->flags |= IFA_F_DEPRECATED; 3214 } 3215 3216 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3217 next = ifp->tstamp + ifp->valid_lft * HZ; 3218 3219 spin_unlock(&ifp->lock); 3220 3221 if (deprecate) { 3222 in6_ifa_hold(ifp); 3223 3224 ipv6_ifa_notify(0, ifp); 3225 in6_ifa_put(ifp); 3226 goto restart; 3227 } 3228 #ifdef CONFIG_IPV6_PRIVACY 3229 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3230 !(ifp->flags&IFA_F_TENTATIVE)) { 3231 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3232 ifp->idev->cnf.dad_transmits * 3233 ifp->idev->nd_parms->retrans_time / HZ; 3234 3235 if (age >= ifp->prefered_lft - regen_advance) { 3236 struct inet6_ifaddr *ifpub = ifp->ifpub; 3237 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3238 next = ifp->tstamp + ifp->prefered_lft * HZ; 3239 if (!ifp->regen_count && ifpub) { 3240 ifp->regen_count++; 3241 in6_ifa_hold(ifp); 3242 in6_ifa_hold(ifpub); 3243 spin_unlock(&ifp->lock); 3244 3245 spin_lock(&ifpub->lock); 3246 ifpub->regen_count = 0; 3247 spin_unlock(&ifpub->lock); 3248 ipv6_create_tempaddr(ifpub, ifp); 3249 in6_ifa_put(ifpub); 3250 in6_ifa_put(ifp); 3251 goto restart; 3252 } 3253 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3254 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3255 spin_unlock(&ifp->lock); 3256 #endif 3257 } else { 3258 /* ifp->prefered_lft <= ifp->valid_lft */ 3259 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3260 next = ifp->tstamp + ifp->prefered_lft * HZ; 3261 spin_unlock(&ifp->lock); 3262 } 3263 } 3264 } 3265 3266 next_sec = round_jiffies_up(next); 3267 next_sched = next; 3268 3269 /* If rounded timeout is accurate enough, accept it. */ 3270 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3271 next_sched = next_sec; 3272 3273 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3274 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3275 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3276 3277 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3278 now, next, next_sec, next_sched)); 3279 3280 addr_chk_timer.expires = next_sched; 3281 add_timer(&addr_chk_timer); 3282 spin_unlock(&addrconf_verify_lock); 3283 rcu_read_unlock_bh(); 3284 } 3285 3286 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3287 { 3288 struct in6_addr *pfx = NULL; 3289 3290 if (addr) 3291 pfx = nla_data(addr); 3292 3293 if (local) { 3294 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3295 pfx = NULL; 3296 else 3297 pfx = nla_data(local); 3298 } 3299 3300 return pfx; 3301 } 3302 3303 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3304 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3305 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3306 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3307 }; 3308 3309 static int 3310 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3311 { 3312 struct net *net = sock_net(skb->sk); 3313 struct ifaddrmsg *ifm; 3314 struct nlattr *tb[IFA_MAX+1]; 3315 struct in6_addr *pfx; 3316 int err; 3317 3318 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3319 if (err < 0) 3320 return err; 3321 3322 ifm = nlmsg_data(nlh); 3323 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3324 if (pfx == NULL) 3325 return -EINVAL; 3326 3327 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3328 } 3329 3330 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3331 u32 prefered_lft, u32 valid_lft) 3332 { 3333 u32 flags; 3334 clock_t expires; 3335 unsigned long timeout; 3336 3337 if (!valid_lft || (prefered_lft > valid_lft)) 3338 return -EINVAL; 3339 3340 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3341 if (addrconf_finite_timeout(timeout)) { 3342 expires = jiffies_to_clock_t(timeout * HZ); 3343 valid_lft = timeout; 3344 flags = RTF_EXPIRES; 3345 } else { 3346 expires = 0; 3347 flags = 0; 3348 ifa_flags |= IFA_F_PERMANENT; 3349 } 3350 3351 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3352 if (addrconf_finite_timeout(timeout)) { 3353 if (timeout == 0) 3354 ifa_flags |= IFA_F_DEPRECATED; 3355 prefered_lft = timeout; 3356 } 3357 3358 spin_lock_bh(&ifp->lock); 3359 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3360 ifp->tstamp = jiffies; 3361 ifp->valid_lft = valid_lft; 3362 ifp->prefered_lft = prefered_lft; 3363 3364 spin_unlock_bh(&ifp->lock); 3365 if (!(ifp->flags&IFA_F_TENTATIVE)) 3366 ipv6_ifa_notify(0, ifp); 3367 3368 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3369 expires, flags); 3370 addrconf_verify(0); 3371 3372 return 0; 3373 } 3374 3375 static int 3376 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3377 { 3378 struct net *net = sock_net(skb->sk); 3379 struct ifaddrmsg *ifm; 3380 struct nlattr *tb[IFA_MAX+1]; 3381 struct in6_addr *pfx; 3382 struct inet6_ifaddr *ifa; 3383 struct net_device *dev; 3384 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3385 u8 ifa_flags; 3386 int err; 3387 3388 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3389 if (err < 0) 3390 return err; 3391 3392 ifm = nlmsg_data(nlh); 3393 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3394 if (pfx == NULL) 3395 return -EINVAL; 3396 3397 if (tb[IFA_CACHEINFO]) { 3398 struct ifa_cacheinfo *ci; 3399 3400 ci = nla_data(tb[IFA_CACHEINFO]); 3401 valid_lft = ci->ifa_valid; 3402 preferred_lft = ci->ifa_prefered; 3403 } else { 3404 preferred_lft = INFINITY_LIFE_TIME; 3405 valid_lft = INFINITY_LIFE_TIME; 3406 } 3407 3408 dev = __dev_get_by_index(net, ifm->ifa_index); 3409 if (dev == NULL) 3410 return -ENODEV; 3411 3412 /* We ignore other flags so far. */ 3413 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3414 3415 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3416 if (ifa == NULL) { 3417 /* 3418 * It would be best to check for !NLM_F_CREATE here but 3419 * userspace alreay relies on not having to provide this. 3420 */ 3421 return inet6_addr_add(net, ifm->ifa_index, pfx, 3422 ifm->ifa_prefixlen, ifa_flags, 3423 preferred_lft, valid_lft); 3424 } 3425 3426 if (nlh->nlmsg_flags & NLM_F_EXCL || 3427 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3428 err = -EEXIST; 3429 else 3430 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3431 3432 in6_ifa_put(ifa); 3433 3434 return err; 3435 } 3436 3437 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3438 u8 scope, int ifindex) 3439 { 3440 struct ifaddrmsg *ifm; 3441 3442 ifm = nlmsg_data(nlh); 3443 ifm->ifa_family = AF_INET6; 3444 ifm->ifa_prefixlen = prefixlen; 3445 ifm->ifa_flags = flags; 3446 ifm->ifa_scope = scope; 3447 ifm->ifa_index = ifindex; 3448 } 3449 3450 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3451 unsigned long tstamp, u32 preferred, u32 valid) 3452 { 3453 struct ifa_cacheinfo ci; 3454 3455 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3456 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3457 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3458 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3459 ci.ifa_prefered = preferred; 3460 ci.ifa_valid = valid; 3461 3462 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3463 } 3464 3465 static inline int rt_scope(int ifa_scope) 3466 { 3467 if (ifa_scope & IFA_HOST) 3468 return RT_SCOPE_HOST; 3469 else if (ifa_scope & IFA_LINK) 3470 return RT_SCOPE_LINK; 3471 else if (ifa_scope & IFA_SITE) 3472 return RT_SCOPE_SITE; 3473 else 3474 return RT_SCOPE_UNIVERSE; 3475 } 3476 3477 static inline int inet6_ifaddr_msgsize(void) 3478 { 3479 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3480 + nla_total_size(16) /* IFA_ADDRESS */ 3481 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3482 } 3483 3484 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3485 u32 pid, u32 seq, int event, unsigned int flags) 3486 { 3487 struct nlmsghdr *nlh; 3488 u32 preferred, valid; 3489 3490 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3491 if (nlh == NULL) 3492 return -EMSGSIZE; 3493 3494 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3495 ifa->idev->dev->ifindex); 3496 3497 if (!(ifa->flags&IFA_F_PERMANENT)) { 3498 preferred = ifa->prefered_lft; 3499 valid = ifa->valid_lft; 3500 if (preferred != INFINITY_LIFE_TIME) { 3501 long tval = (jiffies - ifa->tstamp)/HZ; 3502 if (preferred > tval) 3503 preferred -= tval; 3504 else 3505 preferred = 0; 3506 if (valid != INFINITY_LIFE_TIME) { 3507 if (valid > tval) 3508 valid -= tval; 3509 else 3510 valid = 0; 3511 } 3512 } 3513 } else { 3514 preferred = INFINITY_LIFE_TIME; 3515 valid = INFINITY_LIFE_TIME; 3516 } 3517 3518 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3519 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3520 nlmsg_cancel(skb, nlh); 3521 return -EMSGSIZE; 3522 } 3523 3524 return nlmsg_end(skb, nlh); 3525 } 3526 3527 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3528 u32 pid, u32 seq, int event, u16 flags) 3529 { 3530 struct nlmsghdr *nlh; 3531 u8 scope = RT_SCOPE_UNIVERSE; 3532 int ifindex = ifmca->idev->dev->ifindex; 3533 3534 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3535 scope = RT_SCOPE_SITE; 3536 3537 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3538 if (nlh == NULL) 3539 return -EMSGSIZE; 3540 3541 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3542 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3543 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3544 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3545 nlmsg_cancel(skb, nlh); 3546 return -EMSGSIZE; 3547 } 3548 3549 return nlmsg_end(skb, nlh); 3550 } 3551 3552 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3553 u32 pid, u32 seq, int event, unsigned int flags) 3554 { 3555 struct nlmsghdr *nlh; 3556 u8 scope = RT_SCOPE_UNIVERSE; 3557 int ifindex = ifaca->aca_idev->dev->ifindex; 3558 3559 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3560 scope = RT_SCOPE_SITE; 3561 3562 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3563 if (nlh == NULL) 3564 return -EMSGSIZE; 3565 3566 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3567 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3568 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3569 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3570 nlmsg_cancel(skb, nlh); 3571 return -EMSGSIZE; 3572 } 3573 3574 return nlmsg_end(skb, nlh); 3575 } 3576 3577 enum addr_type_t { 3578 UNICAST_ADDR, 3579 MULTICAST_ADDR, 3580 ANYCAST_ADDR, 3581 }; 3582 3583 /* called with rcu_read_lock() */ 3584 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3585 struct netlink_callback *cb, enum addr_type_t type, 3586 int s_ip_idx, int *p_ip_idx) 3587 { 3588 struct ifmcaddr6 *ifmca; 3589 struct ifacaddr6 *ifaca; 3590 int err = 1; 3591 int ip_idx = *p_ip_idx; 3592 3593 read_lock_bh(&idev->lock); 3594 switch (type) { 3595 case UNICAST_ADDR: { 3596 struct inet6_ifaddr *ifa; 3597 3598 /* unicast address incl. temp addr */ 3599 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3600 if (++ip_idx < s_ip_idx) 3601 continue; 3602 err = inet6_fill_ifaddr(skb, ifa, 3603 NETLINK_CB(cb->skb).pid, 3604 cb->nlh->nlmsg_seq, 3605 RTM_NEWADDR, 3606 NLM_F_MULTI); 3607 if (err <= 0) 3608 break; 3609 } 3610 break; 3611 } 3612 case MULTICAST_ADDR: 3613 /* multicast address */ 3614 for (ifmca = idev->mc_list; ifmca; 3615 ifmca = ifmca->next, ip_idx++) { 3616 if (ip_idx < s_ip_idx) 3617 continue; 3618 err = inet6_fill_ifmcaddr(skb, ifmca, 3619 NETLINK_CB(cb->skb).pid, 3620 cb->nlh->nlmsg_seq, 3621 RTM_GETMULTICAST, 3622 NLM_F_MULTI); 3623 if (err <= 0) 3624 break; 3625 } 3626 break; 3627 case ANYCAST_ADDR: 3628 /* anycast address */ 3629 for (ifaca = idev->ac_list; ifaca; 3630 ifaca = ifaca->aca_next, ip_idx++) { 3631 if (ip_idx < s_ip_idx) 3632 continue; 3633 err = inet6_fill_ifacaddr(skb, ifaca, 3634 NETLINK_CB(cb->skb).pid, 3635 cb->nlh->nlmsg_seq, 3636 RTM_GETANYCAST, 3637 NLM_F_MULTI); 3638 if (err <= 0) 3639 break; 3640 } 3641 break; 3642 default: 3643 break; 3644 } 3645 read_unlock_bh(&idev->lock); 3646 *p_ip_idx = ip_idx; 3647 return err; 3648 } 3649 3650 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3651 enum addr_type_t type) 3652 { 3653 struct net *net = sock_net(skb->sk); 3654 int h, s_h; 3655 int idx, ip_idx; 3656 int s_idx, s_ip_idx; 3657 struct net_device *dev; 3658 struct inet6_dev *idev; 3659 struct hlist_head *head; 3660 struct hlist_node *node; 3661 3662 s_h = cb->args[0]; 3663 s_idx = idx = cb->args[1]; 3664 s_ip_idx = ip_idx = cb->args[2]; 3665 3666 rcu_read_lock(); 3667 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3668 idx = 0; 3669 head = &net->dev_index_head[h]; 3670 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3671 if (idx < s_idx) 3672 goto cont; 3673 if (h > s_h || idx > s_idx) 3674 s_ip_idx = 0; 3675 ip_idx = 0; 3676 idev = __in6_dev_get(dev); 3677 if (!idev) 3678 goto cont; 3679 3680 if (in6_dump_addrs(idev, skb, cb, type, 3681 s_ip_idx, &ip_idx) <= 0) 3682 goto done; 3683 cont: 3684 idx++; 3685 } 3686 } 3687 done: 3688 rcu_read_unlock(); 3689 cb->args[0] = h; 3690 cb->args[1] = idx; 3691 cb->args[2] = ip_idx; 3692 3693 return skb->len; 3694 } 3695 3696 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3697 { 3698 enum addr_type_t type = UNICAST_ADDR; 3699 3700 return inet6_dump_addr(skb, cb, type); 3701 } 3702 3703 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3704 { 3705 enum addr_type_t type = MULTICAST_ADDR; 3706 3707 return inet6_dump_addr(skb, cb, type); 3708 } 3709 3710 3711 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3712 { 3713 enum addr_type_t type = ANYCAST_ADDR; 3714 3715 return inet6_dump_addr(skb, cb, type); 3716 } 3717 3718 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3719 void *arg) 3720 { 3721 struct net *net = sock_net(in_skb->sk); 3722 struct ifaddrmsg *ifm; 3723 struct nlattr *tb[IFA_MAX+1]; 3724 struct in6_addr *addr = NULL; 3725 struct net_device *dev = NULL; 3726 struct inet6_ifaddr *ifa; 3727 struct sk_buff *skb; 3728 int err; 3729 3730 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3731 if (err < 0) 3732 goto errout; 3733 3734 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3735 if (addr == NULL) { 3736 err = -EINVAL; 3737 goto errout; 3738 } 3739 3740 ifm = nlmsg_data(nlh); 3741 if (ifm->ifa_index) 3742 dev = __dev_get_by_index(net, ifm->ifa_index); 3743 3744 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3745 if (!ifa) { 3746 err = -EADDRNOTAVAIL; 3747 goto errout; 3748 } 3749 3750 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3751 if (!skb) { 3752 err = -ENOBUFS; 3753 goto errout_ifa; 3754 } 3755 3756 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3757 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3758 if (err < 0) { 3759 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3760 WARN_ON(err == -EMSGSIZE); 3761 kfree_skb(skb); 3762 goto errout_ifa; 3763 } 3764 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3765 errout_ifa: 3766 in6_ifa_put(ifa); 3767 errout: 3768 return err; 3769 } 3770 3771 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3772 { 3773 struct sk_buff *skb; 3774 struct net *net = dev_net(ifa->idev->dev); 3775 int err = -ENOBUFS; 3776 3777 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3778 if (skb == NULL) 3779 goto errout; 3780 3781 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3782 if (err < 0) { 3783 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3784 WARN_ON(err == -EMSGSIZE); 3785 kfree_skb(skb); 3786 goto errout; 3787 } 3788 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3789 return; 3790 errout: 3791 if (err < 0) 3792 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3793 } 3794 3795 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3796 __s32 *array, int bytes) 3797 { 3798 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3799 3800 memset(array, 0, bytes); 3801 array[DEVCONF_FORWARDING] = cnf->forwarding; 3802 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3803 array[DEVCONF_MTU6] = cnf->mtu6; 3804 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3805 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3806 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3807 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3808 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3809 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3810 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3811 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3812 #ifdef CONFIG_IPV6_PRIVACY 3813 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3814 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3815 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3816 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3817 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3818 #endif 3819 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3820 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3821 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3822 #ifdef CONFIG_IPV6_ROUTER_PREF 3823 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3824 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3825 #ifdef CONFIG_IPV6_ROUTE_INFO 3826 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3827 #endif 3828 #endif 3829 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3830 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3831 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3832 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3833 #endif 3834 #ifdef CONFIG_IPV6_MROUTE 3835 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3836 #endif 3837 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3838 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3839 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3840 } 3841 3842 static inline size_t inet6_if_nlmsg_size(void) 3843 { 3844 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3845 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3846 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3847 + nla_total_size(4) /* IFLA_MTU */ 3848 + nla_total_size(4) /* IFLA_LINK */ 3849 + nla_total_size( /* IFLA_PROTINFO */ 3850 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3851 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3852 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3853 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3854 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3855 ); 3856 } 3857 3858 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib, 3859 int items, int bytes) 3860 { 3861 int i; 3862 int pad = bytes - sizeof(u64) * items; 3863 BUG_ON(pad < 0); 3864 3865 /* Use put_unaligned() because stats may not be aligned for u64. */ 3866 put_unaligned(items, &stats[0]); 3867 for (i = 1; i < items; i++) 3868 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3869 3870 memset(&stats[items], 0, pad); 3871 } 3872 3873 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3874 int items, int bytes, size_t syncpoff) 3875 { 3876 int i; 3877 int pad = bytes - sizeof(u64) * items; 3878 BUG_ON(pad < 0); 3879 3880 /* Use put_unaligned() because stats may not be aligned for u64. */ 3881 put_unaligned(items, &stats[0]); 3882 for (i = 1; i < items; i++) 3883 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3884 3885 memset(&stats[items], 0, pad); 3886 } 3887 3888 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3889 int bytes) 3890 { 3891 switch (attrtype) { 3892 case IFLA_INET6_STATS: 3893 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3894 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3895 break; 3896 case IFLA_INET6_ICMP6STATS: 3897 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3898 break; 3899 } 3900 } 3901 3902 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3903 u32 pid, u32 seq, int event, unsigned int flags) 3904 { 3905 struct net_device *dev = idev->dev; 3906 struct nlattr *nla; 3907 struct ifinfomsg *hdr; 3908 struct nlmsghdr *nlh; 3909 void *protoinfo; 3910 struct ifla_cacheinfo ci; 3911 3912 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3913 if (nlh == NULL) 3914 return -EMSGSIZE; 3915 3916 hdr = nlmsg_data(nlh); 3917 hdr->ifi_family = AF_INET6; 3918 hdr->__ifi_pad = 0; 3919 hdr->ifi_type = dev->type; 3920 hdr->ifi_index = dev->ifindex; 3921 hdr->ifi_flags = dev_get_flags(dev); 3922 hdr->ifi_change = 0; 3923 3924 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3925 3926 if (dev->addr_len) 3927 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3928 3929 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3930 if (dev->ifindex != dev->iflink) 3931 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3932 3933 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3934 if (protoinfo == NULL) 3935 goto nla_put_failure; 3936 3937 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3938 3939 ci.max_reasm_len = IPV6_MAXPLEN; 3940 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3941 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3942 ci.reachable_time = idev->nd_parms->reachable_time; 3943 ci.retrans_time = idev->nd_parms->retrans_time; 3944 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3945 3946 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3947 if (nla == NULL) 3948 goto nla_put_failure; 3949 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3950 3951 /* XXX - MC not implemented */ 3952 3953 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3954 if (nla == NULL) 3955 goto nla_put_failure; 3956 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3957 3958 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3959 if (nla == NULL) 3960 goto nla_put_failure; 3961 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3962 3963 nla_nest_end(skb, protoinfo); 3964 return nlmsg_end(skb, nlh); 3965 3966 nla_put_failure: 3967 nlmsg_cancel(skb, nlh); 3968 return -EMSGSIZE; 3969 } 3970 3971 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3972 { 3973 struct net *net = sock_net(skb->sk); 3974 int h, s_h; 3975 int idx = 0, s_idx; 3976 struct net_device *dev; 3977 struct inet6_dev *idev; 3978 struct hlist_head *head; 3979 struct hlist_node *node; 3980 3981 s_h = cb->args[0]; 3982 s_idx = cb->args[1]; 3983 3984 rcu_read_lock(); 3985 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3986 idx = 0; 3987 head = &net->dev_index_head[h]; 3988 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3989 if (idx < s_idx) 3990 goto cont; 3991 idev = __in6_dev_get(dev); 3992 if (!idev) 3993 goto cont; 3994 if (inet6_fill_ifinfo(skb, idev, 3995 NETLINK_CB(cb->skb).pid, 3996 cb->nlh->nlmsg_seq, 3997 RTM_NEWLINK, NLM_F_MULTI) <= 0) 3998 goto out; 3999 cont: 4000 idx++; 4001 } 4002 } 4003 out: 4004 rcu_read_unlock(); 4005 cb->args[1] = idx; 4006 cb->args[0] = h; 4007 4008 return skb->len; 4009 } 4010 4011 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4012 { 4013 struct sk_buff *skb; 4014 struct net *net = dev_net(idev->dev); 4015 int err = -ENOBUFS; 4016 4017 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4018 if (skb == NULL) 4019 goto errout; 4020 4021 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4022 if (err < 0) { 4023 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4024 WARN_ON(err == -EMSGSIZE); 4025 kfree_skb(skb); 4026 goto errout; 4027 } 4028 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4029 return; 4030 errout: 4031 if (err < 0) 4032 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4033 } 4034 4035 static inline size_t inet6_prefix_nlmsg_size(void) 4036 { 4037 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4038 + nla_total_size(sizeof(struct in6_addr)) 4039 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4040 } 4041 4042 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4043 struct prefix_info *pinfo, u32 pid, u32 seq, 4044 int event, unsigned int flags) 4045 { 4046 struct prefixmsg *pmsg; 4047 struct nlmsghdr *nlh; 4048 struct prefix_cacheinfo ci; 4049 4050 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4051 if (nlh == NULL) 4052 return -EMSGSIZE; 4053 4054 pmsg = nlmsg_data(nlh); 4055 pmsg->prefix_family = AF_INET6; 4056 pmsg->prefix_pad1 = 0; 4057 pmsg->prefix_pad2 = 0; 4058 pmsg->prefix_ifindex = idev->dev->ifindex; 4059 pmsg->prefix_len = pinfo->prefix_len; 4060 pmsg->prefix_type = pinfo->type; 4061 pmsg->prefix_pad3 = 0; 4062 pmsg->prefix_flags = 0; 4063 if (pinfo->onlink) 4064 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4065 if (pinfo->autoconf) 4066 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4067 4068 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4069 4070 ci.preferred_time = ntohl(pinfo->prefered); 4071 ci.valid_time = ntohl(pinfo->valid); 4072 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4073 4074 return nlmsg_end(skb, nlh); 4075 4076 nla_put_failure: 4077 nlmsg_cancel(skb, nlh); 4078 return -EMSGSIZE; 4079 } 4080 4081 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4082 struct prefix_info *pinfo) 4083 { 4084 struct sk_buff *skb; 4085 struct net *net = dev_net(idev->dev); 4086 int err = -ENOBUFS; 4087 4088 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4089 if (skb == NULL) 4090 goto errout; 4091 4092 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4093 if (err < 0) { 4094 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4095 WARN_ON(err == -EMSGSIZE); 4096 kfree_skb(skb); 4097 goto errout; 4098 } 4099 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4100 return; 4101 errout: 4102 if (err < 0) 4103 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4104 } 4105 4106 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4107 { 4108 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4109 4110 switch (event) { 4111 case RTM_NEWADDR: 4112 /* 4113 * If the address was optimistic 4114 * we inserted the route at the start of 4115 * our DAD process, so we don't need 4116 * to do it again 4117 */ 4118 if (!(ifp->rt->rt6i_node)) 4119 ip6_ins_rt(ifp->rt); 4120 if (ifp->idev->cnf.forwarding) 4121 addrconf_join_anycast(ifp); 4122 break; 4123 case RTM_DELADDR: 4124 if (ifp->idev->cnf.forwarding) 4125 addrconf_leave_anycast(ifp); 4126 addrconf_leave_solict(ifp->idev, &ifp->addr); 4127 dst_hold(&ifp->rt->dst); 4128 4129 if (ifp->state == INET6_IFADDR_STATE_DEAD && 4130 ip6_del_rt(ifp->rt)) 4131 dst_free(&ifp->rt->dst); 4132 break; 4133 } 4134 } 4135 4136 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4137 { 4138 rcu_read_lock_bh(); 4139 if (likely(ifp->idev->dead == 0)) 4140 __ipv6_ifa_notify(event, ifp); 4141 rcu_read_unlock_bh(); 4142 } 4143 4144 #ifdef CONFIG_SYSCTL 4145 4146 static 4147 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4148 void __user *buffer, size_t *lenp, loff_t *ppos) 4149 { 4150 int *valp = ctl->data; 4151 int val = *valp; 4152 loff_t pos = *ppos; 4153 int ret; 4154 4155 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4156 4157 if (write) 4158 ret = addrconf_fixup_forwarding(ctl, valp, val); 4159 if (ret) 4160 *ppos = pos; 4161 return ret; 4162 } 4163 4164 static void dev_disable_change(struct inet6_dev *idev) 4165 { 4166 if (!idev || !idev->dev) 4167 return; 4168 4169 if (idev->cnf.disable_ipv6) 4170 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4171 else 4172 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4173 } 4174 4175 static void addrconf_disable_change(struct net *net, __s32 newf) 4176 { 4177 struct net_device *dev; 4178 struct inet6_dev *idev; 4179 4180 rcu_read_lock(); 4181 for_each_netdev_rcu(net, dev) { 4182 idev = __in6_dev_get(dev); 4183 if (idev) { 4184 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4185 idev->cnf.disable_ipv6 = newf; 4186 if (changed) 4187 dev_disable_change(idev); 4188 } 4189 } 4190 rcu_read_unlock(); 4191 } 4192 4193 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4194 { 4195 struct net *net; 4196 4197 net = (struct net *)table->extra2; 4198 4199 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4200 return 0; 4201 4202 if (!rtnl_trylock()) { 4203 /* Restore the original values before restarting */ 4204 *p = old; 4205 return restart_syscall(); 4206 } 4207 4208 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4209 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4210 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4211 addrconf_disable_change(net, newf); 4212 } else if ((!*p) ^ (!old)) 4213 dev_disable_change((struct inet6_dev *)table->extra1); 4214 4215 rtnl_unlock(); 4216 return 0; 4217 } 4218 4219 static 4220 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4221 void __user *buffer, size_t *lenp, loff_t *ppos) 4222 { 4223 int *valp = ctl->data; 4224 int val = *valp; 4225 loff_t pos = *ppos; 4226 int ret; 4227 4228 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4229 4230 if (write) 4231 ret = addrconf_disable_ipv6(ctl, valp, val); 4232 if (ret) 4233 *ppos = pos; 4234 return ret; 4235 } 4236 4237 static struct addrconf_sysctl_table 4238 { 4239 struct ctl_table_header *sysctl_header; 4240 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4241 char *dev_name; 4242 } addrconf_sysctl __read_mostly = { 4243 .sysctl_header = NULL, 4244 .addrconf_vars = { 4245 { 4246 .procname = "forwarding", 4247 .data = &ipv6_devconf.forwarding, 4248 .maxlen = sizeof(int), 4249 .mode = 0644, 4250 .proc_handler = addrconf_sysctl_forward, 4251 }, 4252 { 4253 .procname = "hop_limit", 4254 .data = &ipv6_devconf.hop_limit, 4255 .maxlen = sizeof(int), 4256 .mode = 0644, 4257 .proc_handler = proc_dointvec, 4258 }, 4259 { 4260 .procname = "mtu", 4261 .data = &ipv6_devconf.mtu6, 4262 .maxlen = sizeof(int), 4263 .mode = 0644, 4264 .proc_handler = proc_dointvec, 4265 }, 4266 { 4267 .procname = "accept_ra", 4268 .data = &ipv6_devconf.accept_ra, 4269 .maxlen = sizeof(int), 4270 .mode = 0644, 4271 .proc_handler = proc_dointvec, 4272 }, 4273 { 4274 .procname = "accept_redirects", 4275 .data = &ipv6_devconf.accept_redirects, 4276 .maxlen = sizeof(int), 4277 .mode = 0644, 4278 .proc_handler = proc_dointvec, 4279 }, 4280 { 4281 .procname = "autoconf", 4282 .data = &ipv6_devconf.autoconf, 4283 .maxlen = sizeof(int), 4284 .mode = 0644, 4285 .proc_handler = proc_dointvec, 4286 }, 4287 { 4288 .procname = "dad_transmits", 4289 .data = &ipv6_devconf.dad_transmits, 4290 .maxlen = sizeof(int), 4291 .mode = 0644, 4292 .proc_handler = proc_dointvec, 4293 }, 4294 { 4295 .procname = "router_solicitations", 4296 .data = &ipv6_devconf.rtr_solicits, 4297 .maxlen = sizeof(int), 4298 .mode = 0644, 4299 .proc_handler = proc_dointvec, 4300 }, 4301 { 4302 .procname = "router_solicitation_interval", 4303 .data = &ipv6_devconf.rtr_solicit_interval, 4304 .maxlen = sizeof(int), 4305 .mode = 0644, 4306 .proc_handler = proc_dointvec_jiffies, 4307 }, 4308 { 4309 .procname = "router_solicitation_delay", 4310 .data = &ipv6_devconf.rtr_solicit_delay, 4311 .maxlen = sizeof(int), 4312 .mode = 0644, 4313 .proc_handler = proc_dointvec_jiffies, 4314 }, 4315 { 4316 .procname = "force_mld_version", 4317 .data = &ipv6_devconf.force_mld_version, 4318 .maxlen = sizeof(int), 4319 .mode = 0644, 4320 .proc_handler = proc_dointvec, 4321 }, 4322 #ifdef CONFIG_IPV6_PRIVACY 4323 { 4324 .procname = "use_tempaddr", 4325 .data = &ipv6_devconf.use_tempaddr, 4326 .maxlen = sizeof(int), 4327 .mode = 0644, 4328 .proc_handler = proc_dointvec, 4329 }, 4330 { 4331 .procname = "temp_valid_lft", 4332 .data = &ipv6_devconf.temp_valid_lft, 4333 .maxlen = sizeof(int), 4334 .mode = 0644, 4335 .proc_handler = proc_dointvec, 4336 }, 4337 { 4338 .procname = "temp_prefered_lft", 4339 .data = &ipv6_devconf.temp_prefered_lft, 4340 .maxlen = sizeof(int), 4341 .mode = 0644, 4342 .proc_handler = proc_dointvec, 4343 }, 4344 { 4345 .procname = "regen_max_retry", 4346 .data = &ipv6_devconf.regen_max_retry, 4347 .maxlen = sizeof(int), 4348 .mode = 0644, 4349 .proc_handler = proc_dointvec, 4350 }, 4351 { 4352 .procname = "max_desync_factor", 4353 .data = &ipv6_devconf.max_desync_factor, 4354 .maxlen = sizeof(int), 4355 .mode = 0644, 4356 .proc_handler = proc_dointvec, 4357 }, 4358 #endif 4359 { 4360 .procname = "max_addresses", 4361 .data = &ipv6_devconf.max_addresses, 4362 .maxlen = sizeof(int), 4363 .mode = 0644, 4364 .proc_handler = proc_dointvec, 4365 }, 4366 { 4367 .procname = "accept_ra_defrtr", 4368 .data = &ipv6_devconf.accept_ra_defrtr, 4369 .maxlen = sizeof(int), 4370 .mode = 0644, 4371 .proc_handler = proc_dointvec, 4372 }, 4373 { 4374 .procname = "accept_ra_pinfo", 4375 .data = &ipv6_devconf.accept_ra_pinfo, 4376 .maxlen = sizeof(int), 4377 .mode = 0644, 4378 .proc_handler = proc_dointvec, 4379 }, 4380 #ifdef CONFIG_IPV6_ROUTER_PREF 4381 { 4382 .procname = "accept_ra_rtr_pref", 4383 .data = &ipv6_devconf.accept_ra_rtr_pref, 4384 .maxlen = sizeof(int), 4385 .mode = 0644, 4386 .proc_handler = proc_dointvec, 4387 }, 4388 { 4389 .procname = "router_probe_interval", 4390 .data = &ipv6_devconf.rtr_probe_interval, 4391 .maxlen = sizeof(int), 4392 .mode = 0644, 4393 .proc_handler = proc_dointvec_jiffies, 4394 }, 4395 #ifdef CONFIG_IPV6_ROUTE_INFO 4396 { 4397 .procname = "accept_ra_rt_info_max_plen", 4398 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4399 .maxlen = sizeof(int), 4400 .mode = 0644, 4401 .proc_handler = proc_dointvec, 4402 }, 4403 #endif 4404 #endif 4405 { 4406 .procname = "proxy_ndp", 4407 .data = &ipv6_devconf.proxy_ndp, 4408 .maxlen = sizeof(int), 4409 .mode = 0644, 4410 .proc_handler = proc_dointvec, 4411 }, 4412 { 4413 .procname = "accept_source_route", 4414 .data = &ipv6_devconf.accept_source_route, 4415 .maxlen = sizeof(int), 4416 .mode = 0644, 4417 .proc_handler = proc_dointvec, 4418 }, 4419 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4420 { 4421 .procname = "optimistic_dad", 4422 .data = &ipv6_devconf.optimistic_dad, 4423 .maxlen = sizeof(int), 4424 .mode = 0644, 4425 .proc_handler = proc_dointvec, 4426 4427 }, 4428 #endif 4429 #ifdef CONFIG_IPV6_MROUTE 4430 { 4431 .procname = "mc_forwarding", 4432 .data = &ipv6_devconf.mc_forwarding, 4433 .maxlen = sizeof(int), 4434 .mode = 0444, 4435 .proc_handler = proc_dointvec, 4436 }, 4437 #endif 4438 { 4439 .procname = "disable_ipv6", 4440 .data = &ipv6_devconf.disable_ipv6, 4441 .maxlen = sizeof(int), 4442 .mode = 0644, 4443 .proc_handler = addrconf_sysctl_disable, 4444 }, 4445 { 4446 .procname = "accept_dad", 4447 .data = &ipv6_devconf.accept_dad, 4448 .maxlen = sizeof(int), 4449 .mode = 0644, 4450 .proc_handler = proc_dointvec, 4451 }, 4452 { 4453 .procname = "force_tllao", 4454 .data = &ipv6_devconf.force_tllao, 4455 .maxlen = sizeof(int), 4456 .mode = 0644, 4457 .proc_handler = proc_dointvec 4458 }, 4459 { 4460 /* sentinel */ 4461 } 4462 }, 4463 }; 4464 4465 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4466 struct inet6_dev *idev, struct ipv6_devconf *p) 4467 { 4468 int i; 4469 struct addrconf_sysctl_table *t; 4470 4471 #define ADDRCONF_CTL_PATH_DEV 3 4472 4473 struct ctl_path addrconf_ctl_path[] = { 4474 { .procname = "net", }, 4475 { .procname = "ipv6", }, 4476 { .procname = "conf", }, 4477 { /* to be set */ }, 4478 { }, 4479 }; 4480 4481 4482 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4483 if (t == NULL) 4484 goto out; 4485 4486 for (i = 0; t->addrconf_vars[i].data; i++) { 4487 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4488 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4489 t->addrconf_vars[i].extra2 = net; 4490 } 4491 4492 /* 4493 * Make a copy of dev_name, because '.procname' is regarded as const 4494 * by sysctl and we wouldn't want anyone to change it under our feet 4495 * (see SIOCSIFNAME). 4496 */ 4497 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4498 if (!t->dev_name) 4499 goto free; 4500 4501 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4502 4503 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4504 t->addrconf_vars); 4505 if (t->sysctl_header == NULL) 4506 goto free_procname; 4507 4508 p->sysctl = t; 4509 return 0; 4510 4511 free_procname: 4512 kfree(t->dev_name); 4513 free: 4514 kfree(t); 4515 out: 4516 return -ENOBUFS; 4517 } 4518 4519 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4520 { 4521 struct addrconf_sysctl_table *t; 4522 4523 if (p->sysctl == NULL) 4524 return; 4525 4526 t = p->sysctl; 4527 p->sysctl = NULL; 4528 unregister_sysctl_table(t->sysctl_header); 4529 kfree(t->dev_name); 4530 kfree(t); 4531 } 4532 4533 static void addrconf_sysctl_register(struct inet6_dev *idev) 4534 { 4535 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4536 &ndisc_ifinfo_sysctl_change); 4537 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4538 idev, &idev->cnf); 4539 } 4540 4541 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4542 { 4543 __addrconf_sysctl_unregister(&idev->cnf); 4544 neigh_sysctl_unregister(idev->nd_parms); 4545 } 4546 4547 4548 #endif 4549 4550 static int __net_init addrconf_init_net(struct net *net) 4551 { 4552 int err; 4553 struct ipv6_devconf *all, *dflt; 4554 4555 err = -ENOMEM; 4556 all = &ipv6_devconf; 4557 dflt = &ipv6_devconf_dflt; 4558 4559 if (!net_eq(net, &init_net)) { 4560 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4561 if (all == NULL) 4562 goto err_alloc_all; 4563 4564 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4565 if (dflt == NULL) 4566 goto err_alloc_dflt; 4567 } else { 4568 /* these will be inherited by all namespaces */ 4569 dflt->autoconf = ipv6_defaults.autoconf; 4570 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4571 } 4572 4573 net->ipv6.devconf_all = all; 4574 net->ipv6.devconf_dflt = dflt; 4575 4576 #ifdef CONFIG_SYSCTL 4577 err = __addrconf_sysctl_register(net, "all", NULL, all); 4578 if (err < 0) 4579 goto err_reg_all; 4580 4581 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4582 if (err < 0) 4583 goto err_reg_dflt; 4584 #endif 4585 return 0; 4586 4587 #ifdef CONFIG_SYSCTL 4588 err_reg_dflt: 4589 __addrconf_sysctl_unregister(all); 4590 err_reg_all: 4591 kfree(dflt); 4592 #endif 4593 err_alloc_dflt: 4594 kfree(all); 4595 err_alloc_all: 4596 return err; 4597 } 4598 4599 static void __net_exit addrconf_exit_net(struct net *net) 4600 { 4601 #ifdef CONFIG_SYSCTL 4602 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4603 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4604 #endif 4605 if (!net_eq(net, &init_net)) { 4606 kfree(net->ipv6.devconf_dflt); 4607 kfree(net->ipv6.devconf_all); 4608 } 4609 } 4610 4611 static struct pernet_operations addrconf_ops = { 4612 .init = addrconf_init_net, 4613 .exit = addrconf_exit_net, 4614 }; 4615 4616 /* 4617 * Device notifier 4618 */ 4619 4620 int register_inet6addr_notifier(struct notifier_block *nb) 4621 { 4622 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4623 } 4624 EXPORT_SYMBOL(register_inet6addr_notifier); 4625 4626 int unregister_inet6addr_notifier(struct notifier_block *nb) 4627 { 4628 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4629 } 4630 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4631 4632 /* 4633 * Init / cleanup code 4634 */ 4635 4636 int __init addrconf_init(void) 4637 { 4638 int i, err; 4639 4640 err = ipv6_addr_label_init(); 4641 if (err < 0) { 4642 printk(KERN_CRIT "IPv6 Addrconf:" 4643 " cannot initialize default policy table: %d.\n", err); 4644 goto out; 4645 } 4646 4647 err = register_pernet_subsys(&addrconf_ops); 4648 if (err < 0) 4649 goto out_addrlabel; 4650 4651 /* The addrconf netdev notifier requires that loopback_dev 4652 * has it's ipv6 private information allocated and setup 4653 * before it can bring up and give link-local addresses 4654 * to other devices which are up. 4655 * 4656 * Unfortunately, loopback_dev is not necessarily the first 4657 * entry in the global dev_base list of net devices. In fact, 4658 * it is likely to be the very last entry on that list. 4659 * So this causes the notifier registry below to try and 4660 * give link-local addresses to all devices besides loopback_dev 4661 * first, then loopback_dev, which cases all the non-loopback_dev 4662 * devices to fail to get a link-local address. 4663 * 4664 * So, as a temporary fix, allocate the ipv6 structure for 4665 * loopback_dev first by hand. 4666 * Longer term, all of the dependencies ipv6 has upon the loopback 4667 * device and it being up should be removed. 4668 */ 4669 rtnl_lock(); 4670 if (!ipv6_add_dev(init_net.loopback_dev)) 4671 err = -ENOMEM; 4672 rtnl_unlock(); 4673 if (err) 4674 goto errlo; 4675 4676 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4677 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4678 4679 register_netdevice_notifier(&ipv6_dev_notf); 4680 4681 addrconf_verify(0); 4682 4683 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4684 if (err < 0) 4685 goto errout; 4686 4687 /* Only the first call to __rtnl_register can fail */ 4688 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4689 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4690 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4691 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4692 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4693 4694 ipv6_addr_label_rtnl_register(); 4695 4696 return 0; 4697 errout: 4698 unregister_netdevice_notifier(&ipv6_dev_notf); 4699 errlo: 4700 unregister_pernet_subsys(&addrconf_ops); 4701 out_addrlabel: 4702 ipv6_addr_label_cleanup(); 4703 out: 4704 return err; 4705 } 4706 4707 void addrconf_cleanup(void) 4708 { 4709 struct net_device *dev; 4710 int i; 4711 4712 unregister_netdevice_notifier(&ipv6_dev_notf); 4713 unregister_pernet_subsys(&addrconf_ops); 4714 ipv6_addr_label_cleanup(); 4715 4716 rtnl_lock(); 4717 4718 /* clean dev list */ 4719 for_each_netdev(&init_net, dev) { 4720 if (__in6_dev_get(dev) == NULL) 4721 continue; 4722 addrconf_ifdown(dev, 1); 4723 } 4724 addrconf_ifdown(init_net.loopback_dev, 2); 4725 4726 /* 4727 * Check hash table. 4728 */ 4729 spin_lock_bh(&addrconf_hash_lock); 4730 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4731 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4732 spin_unlock_bh(&addrconf_hash_lock); 4733 4734 del_timer(&addr_chk_timer); 4735 rtnl_unlock(); 4736 } 4737