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 return; 1432 1433 if (net_ratelimit()) 1434 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1435 ifp->idev->dev->name, &ifp->addr); 1436 1437 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1438 struct in6_addr addr; 1439 1440 addr.s6_addr32[0] = htonl(0xfe800000); 1441 addr.s6_addr32[1] = 0; 1442 1443 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1444 ipv6_addr_equal(&ifp->addr, &addr)) { 1445 /* DAD failed for link-local based on MAC address */ 1446 idev->cnf.disable_ipv6 = 1; 1447 1448 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1449 ifp->idev->dev->name); 1450 } 1451 } 1452 1453 addrconf_dad_stop(ifp, 1); 1454 } 1455 1456 /* Join to solicited addr multicast group. */ 1457 1458 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1459 { 1460 struct in6_addr maddr; 1461 1462 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1463 return; 1464 1465 addrconf_addr_solict_mult(addr, &maddr); 1466 ipv6_dev_mc_inc(dev, &maddr); 1467 } 1468 1469 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1470 { 1471 struct in6_addr maddr; 1472 1473 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1474 return; 1475 1476 addrconf_addr_solict_mult(addr, &maddr); 1477 __ipv6_dev_mc_dec(idev, &maddr); 1478 } 1479 1480 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1481 { 1482 struct in6_addr addr; 1483 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1484 if (ipv6_addr_any(&addr)) 1485 return; 1486 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1487 } 1488 1489 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1490 { 1491 struct in6_addr addr; 1492 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1493 if (ipv6_addr_any(&addr)) 1494 return; 1495 __ipv6_dev_ac_dec(ifp->idev, &addr); 1496 } 1497 1498 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1499 { 1500 if (dev->addr_len != ETH_ALEN) 1501 return -1; 1502 memcpy(eui, dev->dev_addr, 3); 1503 memcpy(eui + 5, dev->dev_addr + 3, 3); 1504 1505 /* 1506 * The zSeries OSA network cards can be shared among various 1507 * OS instances, but the OSA cards have only one MAC address. 1508 * This leads to duplicate address conflicts in conjunction 1509 * with IPv6 if more than one instance uses the same card. 1510 * 1511 * The driver for these cards can deliver a unique 16-bit 1512 * identifier for each instance sharing the same card. It is 1513 * placed instead of 0xFFFE in the interface identifier. The 1514 * "u" bit of the interface identifier is not inverted in this 1515 * case. Hence the resulting interface identifier has local 1516 * scope according to RFC2373. 1517 */ 1518 if (dev->dev_id) { 1519 eui[3] = (dev->dev_id >> 8) & 0xFF; 1520 eui[4] = dev->dev_id & 0xFF; 1521 } else { 1522 eui[3] = 0xFF; 1523 eui[4] = 0xFE; 1524 eui[0] ^= 2; 1525 } 1526 return 0; 1527 } 1528 1529 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1530 { 1531 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1532 if (dev->addr_len != ARCNET_ALEN) 1533 return -1; 1534 memset(eui, 0, 7); 1535 eui[7] = *(u8*)dev->dev_addr; 1536 return 0; 1537 } 1538 1539 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1540 { 1541 if (dev->addr_len != INFINIBAND_ALEN) 1542 return -1; 1543 memcpy(eui, dev->dev_addr + 12, 8); 1544 eui[0] |= 2; 1545 return 0; 1546 } 1547 1548 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1549 { 1550 if (addr == 0) 1551 return -1; 1552 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1553 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1554 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1555 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1556 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1557 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1558 eui[1] = 0; 1559 eui[2] = 0x5E; 1560 eui[3] = 0xFE; 1561 memcpy(eui + 4, &addr, 4); 1562 return 0; 1563 } 1564 1565 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1566 { 1567 if (dev->priv_flags & IFF_ISATAP) 1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1569 return -1; 1570 } 1571 1572 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1573 { 1574 switch (dev->type) { 1575 case ARPHRD_ETHER: 1576 case ARPHRD_FDDI: 1577 case ARPHRD_IEEE802_TR: 1578 return addrconf_ifid_eui48(eui, dev); 1579 case ARPHRD_ARCNET: 1580 return addrconf_ifid_arcnet(eui, dev); 1581 case ARPHRD_INFINIBAND: 1582 return addrconf_ifid_infiniband(eui, dev); 1583 case ARPHRD_SIT: 1584 return addrconf_ifid_sit(eui, dev); 1585 } 1586 return -1; 1587 } 1588 1589 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1590 { 1591 int err = -1; 1592 struct inet6_ifaddr *ifp; 1593 1594 read_lock_bh(&idev->lock); 1595 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1596 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1597 memcpy(eui, ifp->addr.s6_addr+8, 8); 1598 err = 0; 1599 break; 1600 } 1601 } 1602 read_unlock_bh(&idev->lock); 1603 return err; 1604 } 1605 1606 #ifdef CONFIG_IPV6_PRIVACY 1607 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1608 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1609 { 1610 regen: 1611 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1612 idev->rndid[0] &= ~0x02; 1613 1614 /* 1615 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1616 * check if generated address is not inappropriate 1617 * 1618 * - Reserved subnet anycast (RFC 2526) 1619 * 11111101 11....11 1xxxxxxx 1620 * - ISATAP (RFC4214) 6.1 1621 * 00-00-5E-FE-xx-xx-xx-xx 1622 * - value 0 1623 * - XXX: already assigned to an address on the device 1624 */ 1625 if (idev->rndid[0] == 0xfd && 1626 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1627 (idev->rndid[7]&0x80)) 1628 goto regen; 1629 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1630 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1631 goto regen; 1632 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1633 goto regen; 1634 } 1635 1636 return 0; 1637 } 1638 1639 static void ipv6_regen_rndid(unsigned long data) 1640 { 1641 struct inet6_dev *idev = (struct inet6_dev *) data; 1642 unsigned long expires; 1643 1644 rcu_read_lock_bh(); 1645 write_lock_bh(&idev->lock); 1646 1647 if (idev->dead) 1648 goto out; 1649 1650 if (__ipv6_regen_rndid(idev) < 0) 1651 goto out; 1652 1653 expires = jiffies + 1654 idev->cnf.temp_prefered_lft * HZ - 1655 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1656 idev->cnf.max_desync_factor * HZ; 1657 if (time_before(expires, jiffies)) { 1658 printk(KERN_WARNING 1659 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1660 idev->dev->name); 1661 goto out; 1662 } 1663 1664 if (!mod_timer(&idev->regen_timer, expires)) 1665 in6_dev_hold(idev); 1666 1667 out: 1668 write_unlock_bh(&idev->lock); 1669 rcu_read_unlock_bh(); 1670 in6_dev_put(idev); 1671 } 1672 1673 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1674 int ret = 0; 1675 1676 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1677 ret = __ipv6_regen_rndid(idev); 1678 return ret; 1679 } 1680 #endif 1681 1682 /* 1683 * Add prefix route. 1684 */ 1685 1686 static void 1687 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1688 unsigned long expires, u32 flags) 1689 { 1690 struct fib6_config cfg = { 1691 .fc_table = RT6_TABLE_PREFIX, 1692 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1693 .fc_ifindex = dev->ifindex, 1694 .fc_expires = expires, 1695 .fc_dst_len = plen, 1696 .fc_flags = RTF_UP | flags, 1697 .fc_nlinfo.nl_net = dev_net(dev), 1698 .fc_protocol = RTPROT_KERNEL, 1699 }; 1700 1701 ipv6_addr_copy(&cfg.fc_dst, pfx); 1702 1703 /* Prevent useless cloning on PtP SIT. 1704 This thing is done here expecting that the whole 1705 class of non-broadcast devices need not cloning. 1706 */ 1707 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1708 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1709 cfg.fc_flags |= RTF_NONEXTHOP; 1710 #endif 1711 1712 ip6_route_add(&cfg); 1713 } 1714 1715 /* Create "default" multicast route to the interface */ 1716 1717 static void addrconf_add_mroute(struct net_device *dev) 1718 { 1719 struct fib6_config cfg = { 1720 .fc_table = RT6_TABLE_LOCAL, 1721 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1722 .fc_ifindex = dev->ifindex, 1723 .fc_dst_len = 8, 1724 .fc_flags = RTF_UP, 1725 .fc_nlinfo.nl_net = dev_net(dev), 1726 }; 1727 1728 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1729 1730 ip6_route_add(&cfg); 1731 } 1732 1733 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1734 static void sit_route_add(struct net_device *dev) 1735 { 1736 struct fib6_config cfg = { 1737 .fc_table = RT6_TABLE_MAIN, 1738 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1739 .fc_ifindex = dev->ifindex, 1740 .fc_dst_len = 96, 1741 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1742 .fc_nlinfo.nl_net = dev_net(dev), 1743 }; 1744 1745 /* prefix length - 96 bits "::d.d.d.d" */ 1746 ip6_route_add(&cfg); 1747 } 1748 #endif 1749 1750 static void addrconf_add_lroute(struct net_device *dev) 1751 { 1752 struct in6_addr addr; 1753 1754 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1755 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1756 } 1757 1758 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1759 { 1760 struct inet6_dev *idev; 1761 1762 ASSERT_RTNL(); 1763 1764 idev = ipv6_find_idev(dev); 1765 if (!idev) 1766 return ERR_PTR(-ENOBUFS); 1767 1768 if (idev->cnf.disable_ipv6) 1769 return ERR_PTR(-EACCES); 1770 1771 /* Add default multicast route */ 1772 addrconf_add_mroute(dev); 1773 1774 /* Add link local route */ 1775 addrconf_add_lroute(dev); 1776 return idev; 1777 } 1778 1779 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1780 { 1781 struct prefix_info *pinfo; 1782 __u32 valid_lft; 1783 __u32 prefered_lft; 1784 int addr_type; 1785 struct inet6_dev *in6_dev; 1786 struct net *net = dev_net(dev); 1787 1788 pinfo = (struct prefix_info *) opt; 1789 1790 if (len < sizeof(struct prefix_info)) { 1791 ADBG(("addrconf: prefix option too short\n")); 1792 return; 1793 } 1794 1795 /* 1796 * Validation checks ([ADDRCONF], page 19) 1797 */ 1798 1799 addr_type = ipv6_addr_type(&pinfo->prefix); 1800 1801 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1802 return; 1803 1804 valid_lft = ntohl(pinfo->valid); 1805 prefered_lft = ntohl(pinfo->prefered); 1806 1807 if (prefered_lft > valid_lft) { 1808 if (net_ratelimit()) 1809 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1810 return; 1811 } 1812 1813 in6_dev = in6_dev_get(dev); 1814 1815 if (in6_dev == NULL) { 1816 if (net_ratelimit()) 1817 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1818 return; 1819 } 1820 1821 /* 1822 * Two things going on here: 1823 * 1) Add routes for on-link prefixes 1824 * 2) Configure prefixes with the auto flag set 1825 */ 1826 1827 if (pinfo->onlink) { 1828 struct rt6_info *rt; 1829 unsigned long rt_expires; 1830 1831 /* Avoid arithmetic overflow. Really, we could 1832 * save rt_expires in seconds, likely valid_lft, 1833 * but it would require division in fib gc, that it 1834 * not good. 1835 */ 1836 if (HZ > USER_HZ) 1837 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1838 else 1839 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1840 1841 if (addrconf_finite_timeout(rt_expires)) 1842 rt_expires *= HZ; 1843 1844 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1845 dev->ifindex, 1); 1846 1847 if (rt && addrconf_is_prefix_route(rt)) { 1848 /* Autoconf prefix route */ 1849 if (valid_lft == 0) { 1850 ip6_del_rt(rt); 1851 rt = NULL; 1852 } else if (addrconf_finite_timeout(rt_expires)) { 1853 /* not infinity */ 1854 rt->rt6i_expires = jiffies + rt_expires; 1855 rt->rt6i_flags |= RTF_EXPIRES; 1856 } else { 1857 rt->rt6i_flags &= ~RTF_EXPIRES; 1858 rt->rt6i_expires = 0; 1859 } 1860 } else if (valid_lft) { 1861 clock_t expires = 0; 1862 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1863 if (addrconf_finite_timeout(rt_expires)) { 1864 /* not infinity */ 1865 flags |= RTF_EXPIRES; 1866 expires = jiffies_to_clock_t(rt_expires); 1867 } 1868 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1869 dev, expires, flags); 1870 } 1871 if (rt) 1872 dst_release(&rt->dst); 1873 } 1874 1875 /* Try to figure out our local address for this prefix */ 1876 1877 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1878 struct inet6_ifaddr * ifp; 1879 struct in6_addr addr; 1880 int create = 0, update_lft = 0; 1881 1882 if (pinfo->prefix_len == 64) { 1883 memcpy(&addr, &pinfo->prefix, 8); 1884 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1885 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1886 in6_dev_put(in6_dev); 1887 return; 1888 } 1889 goto ok; 1890 } 1891 if (net_ratelimit()) 1892 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1893 pinfo->prefix_len); 1894 in6_dev_put(in6_dev); 1895 return; 1896 1897 ok: 1898 1899 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1900 1901 if (ifp == NULL && valid_lft) { 1902 int max_addresses = in6_dev->cnf.max_addresses; 1903 u32 addr_flags = 0; 1904 1905 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1906 if (in6_dev->cnf.optimistic_dad && 1907 !net->ipv6.devconf_all->forwarding) 1908 addr_flags = IFA_F_OPTIMISTIC; 1909 #endif 1910 1911 /* Do not allow to create too much of autoconfigured 1912 * addresses; this would be too easy way to crash kernel. 1913 */ 1914 if (!max_addresses || 1915 ipv6_count_addresses(in6_dev) < max_addresses) 1916 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1917 addr_type&IPV6_ADDR_SCOPE_MASK, 1918 addr_flags); 1919 1920 if (!ifp || IS_ERR(ifp)) { 1921 in6_dev_put(in6_dev); 1922 return; 1923 } 1924 1925 update_lft = create = 1; 1926 ifp->cstamp = jiffies; 1927 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1928 } 1929 1930 if (ifp) { 1931 int flags; 1932 unsigned long now; 1933 #ifdef CONFIG_IPV6_PRIVACY 1934 struct inet6_ifaddr *ift; 1935 #endif 1936 u32 stored_lft; 1937 1938 /* update lifetime (RFC2462 5.5.3 e) */ 1939 spin_lock(&ifp->lock); 1940 now = jiffies; 1941 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1942 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1943 else 1944 stored_lft = 0; 1945 if (!update_lft && stored_lft) { 1946 if (valid_lft > MIN_VALID_LIFETIME || 1947 valid_lft > stored_lft) 1948 update_lft = 1; 1949 else if (stored_lft <= MIN_VALID_LIFETIME) { 1950 /* valid_lft <= stored_lft is always true */ 1951 /* 1952 * RFC 4862 Section 5.5.3e: 1953 * "Note that the preferred lifetime of 1954 * the corresponding address is always 1955 * reset to the Preferred Lifetime in 1956 * the received Prefix Information 1957 * option, regardless of whether the 1958 * valid lifetime is also reset or 1959 * ignored." 1960 * 1961 * So if the preferred lifetime in 1962 * this advertisement is different 1963 * than what we have stored, but the 1964 * valid lifetime is invalid, just 1965 * reset prefered_lft. 1966 * 1967 * We must set the valid lifetime 1968 * to the stored lifetime since we'll 1969 * be updating the timestamp below, 1970 * else we'll set it back to the 1971 * minumum. 1972 */ 1973 if (prefered_lft != ifp->prefered_lft) { 1974 valid_lft = stored_lft; 1975 update_lft = 1; 1976 } 1977 } else { 1978 valid_lft = MIN_VALID_LIFETIME; 1979 if (valid_lft < prefered_lft) 1980 prefered_lft = valid_lft; 1981 update_lft = 1; 1982 } 1983 } 1984 1985 if (update_lft) { 1986 ifp->valid_lft = valid_lft; 1987 ifp->prefered_lft = prefered_lft; 1988 ifp->tstamp = now; 1989 flags = ifp->flags; 1990 ifp->flags &= ~IFA_F_DEPRECATED; 1991 spin_unlock(&ifp->lock); 1992 1993 if (!(flags&IFA_F_TENTATIVE)) 1994 ipv6_ifa_notify(0, ifp); 1995 } else 1996 spin_unlock(&ifp->lock); 1997 1998 #ifdef CONFIG_IPV6_PRIVACY 1999 read_lock_bh(&in6_dev->lock); 2000 /* update all temporary addresses in the list */ 2001 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) { 2002 /* 2003 * When adjusting the lifetimes of an existing 2004 * temporary address, only lower the lifetimes. 2005 * Implementations must not increase the 2006 * lifetimes of an existing temporary address 2007 * when processing a Prefix Information Option. 2008 */ 2009 if (ifp != ift->ifpub) 2010 continue; 2011 2012 spin_lock(&ift->lock); 2013 flags = ift->flags; 2014 if (ift->valid_lft > valid_lft && 2015 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 2016 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 2017 if (ift->prefered_lft > prefered_lft && 2018 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 2019 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 2020 spin_unlock(&ift->lock); 2021 if (!(flags&IFA_F_TENTATIVE)) 2022 ipv6_ifa_notify(0, ift); 2023 } 2024 2025 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2026 /* 2027 * When a new public address is created as described in [ADDRCONF], 2028 * also create a new temporary address. Also create a temporary 2029 * address if it's enabled but no temporary address currently exists. 2030 */ 2031 read_unlock_bh(&in6_dev->lock); 2032 ipv6_create_tempaddr(ifp, NULL); 2033 } else { 2034 read_unlock_bh(&in6_dev->lock); 2035 } 2036 #endif 2037 in6_ifa_put(ifp); 2038 addrconf_verify(0); 2039 } 2040 } 2041 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2042 in6_dev_put(in6_dev); 2043 } 2044 2045 /* 2046 * Set destination address. 2047 * Special case for SIT interfaces where we create a new "virtual" 2048 * device. 2049 */ 2050 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2051 { 2052 struct in6_ifreq ireq; 2053 struct net_device *dev; 2054 int err = -EINVAL; 2055 2056 rtnl_lock(); 2057 2058 err = -EFAULT; 2059 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2060 goto err_exit; 2061 2062 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2063 2064 err = -ENODEV; 2065 if (dev == NULL) 2066 goto err_exit; 2067 2068 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2069 if (dev->type == ARPHRD_SIT) { 2070 const struct net_device_ops *ops = dev->netdev_ops; 2071 struct ifreq ifr; 2072 struct ip_tunnel_parm p; 2073 2074 err = -EADDRNOTAVAIL; 2075 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2076 goto err_exit; 2077 2078 memset(&p, 0, sizeof(p)); 2079 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2080 p.iph.saddr = 0; 2081 p.iph.version = 4; 2082 p.iph.ihl = 5; 2083 p.iph.protocol = IPPROTO_IPV6; 2084 p.iph.ttl = 64; 2085 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2086 2087 if (ops->ndo_do_ioctl) { 2088 mm_segment_t oldfs = get_fs(); 2089 2090 set_fs(KERNEL_DS); 2091 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2092 set_fs(oldfs); 2093 } else 2094 err = -EOPNOTSUPP; 2095 2096 if (err == 0) { 2097 err = -ENOBUFS; 2098 dev = __dev_get_by_name(net, p.name); 2099 if (!dev) 2100 goto err_exit; 2101 err = dev_open(dev); 2102 } 2103 } 2104 #endif 2105 2106 err_exit: 2107 rtnl_unlock(); 2108 return err; 2109 } 2110 2111 /* 2112 * Manual configuration of address on an interface 2113 */ 2114 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2115 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2116 __u32 valid_lft) 2117 { 2118 struct inet6_ifaddr *ifp; 2119 struct inet6_dev *idev; 2120 struct net_device *dev; 2121 int scope; 2122 u32 flags; 2123 clock_t expires; 2124 unsigned long timeout; 2125 2126 ASSERT_RTNL(); 2127 2128 if (plen > 128) 2129 return -EINVAL; 2130 2131 /* check the lifetime */ 2132 if (!valid_lft || prefered_lft > valid_lft) 2133 return -EINVAL; 2134 2135 dev = __dev_get_by_index(net, ifindex); 2136 if (!dev) 2137 return -ENODEV; 2138 2139 idev = addrconf_add_dev(dev); 2140 if (IS_ERR(idev)) 2141 return PTR_ERR(idev); 2142 2143 scope = ipv6_addr_scope(pfx); 2144 2145 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2146 if (addrconf_finite_timeout(timeout)) { 2147 expires = jiffies_to_clock_t(timeout * HZ); 2148 valid_lft = timeout; 2149 flags = RTF_EXPIRES; 2150 } else { 2151 expires = 0; 2152 flags = 0; 2153 ifa_flags |= IFA_F_PERMANENT; 2154 } 2155 2156 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2157 if (addrconf_finite_timeout(timeout)) { 2158 if (timeout == 0) 2159 ifa_flags |= IFA_F_DEPRECATED; 2160 prefered_lft = timeout; 2161 } 2162 2163 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2164 2165 if (!IS_ERR(ifp)) { 2166 spin_lock_bh(&ifp->lock); 2167 ifp->valid_lft = valid_lft; 2168 ifp->prefered_lft = prefered_lft; 2169 ifp->tstamp = jiffies; 2170 spin_unlock_bh(&ifp->lock); 2171 2172 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2173 expires, flags); 2174 /* 2175 * Note that section 3.1 of RFC 4429 indicates 2176 * that the Optimistic flag should not be set for 2177 * manually configured addresses 2178 */ 2179 addrconf_dad_start(ifp, 0); 2180 in6_ifa_put(ifp); 2181 addrconf_verify(0); 2182 return 0; 2183 } 2184 2185 return PTR_ERR(ifp); 2186 } 2187 2188 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2189 unsigned int plen) 2190 { 2191 struct inet6_ifaddr *ifp; 2192 struct inet6_dev *idev; 2193 struct net_device *dev; 2194 2195 if (plen > 128) 2196 return -EINVAL; 2197 2198 dev = __dev_get_by_index(net, ifindex); 2199 if (!dev) 2200 return -ENODEV; 2201 2202 if ((idev = __in6_dev_get(dev)) == NULL) 2203 return -ENXIO; 2204 2205 read_lock_bh(&idev->lock); 2206 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2207 if (ifp->prefix_len == plen && 2208 ipv6_addr_equal(pfx, &ifp->addr)) { 2209 in6_ifa_hold(ifp); 2210 read_unlock_bh(&idev->lock); 2211 2212 ipv6_del_addr(ifp); 2213 2214 /* If the last address is deleted administratively, 2215 disable IPv6 on this interface. 2216 */ 2217 if (list_empty(&idev->addr_list)) 2218 addrconf_ifdown(idev->dev, 1); 2219 return 0; 2220 } 2221 } 2222 read_unlock_bh(&idev->lock); 2223 return -EADDRNOTAVAIL; 2224 } 2225 2226 2227 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2228 { 2229 struct in6_ifreq ireq; 2230 int err; 2231 2232 if (!capable(CAP_NET_ADMIN)) 2233 return -EPERM; 2234 2235 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2236 return -EFAULT; 2237 2238 rtnl_lock(); 2239 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2240 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2241 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2242 rtnl_unlock(); 2243 return err; 2244 } 2245 2246 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2247 { 2248 struct in6_ifreq ireq; 2249 int err; 2250 2251 if (!capable(CAP_NET_ADMIN)) 2252 return -EPERM; 2253 2254 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2255 return -EFAULT; 2256 2257 rtnl_lock(); 2258 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2259 ireq.ifr6_prefixlen); 2260 rtnl_unlock(); 2261 return err; 2262 } 2263 2264 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2265 int plen, int scope) 2266 { 2267 struct inet6_ifaddr *ifp; 2268 2269 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2270 if (!IS_ERR(ifp)) { 2271 spin_lock_bh(&ifp->lock); 2272 ifp->flags &= ~IFA_F_TENTATIVE; 2273 spin_unlock_bh(&ifp->lock); 2274 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2275 in6_ifa_put(ifp); 2276 } 2277 } 2278 2279 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2280 static void sit_add_v4_addrs(struct inet6_dev *idev) 2281 { 2282 struct in6_addr addr; 2283 struct net_device *dev; 2284 struct net *net = dev_net(idev->dev); 2285 int scope; 2286 2287 ASSERT_RTNL(); 2288 2289 memset(&addr, 0, sizeof(struct in6_addr)); 2290 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2291 2292 if (idev->dev->flags&IFF_POINTOPOINT) { 2293 addr.s6_addr32[0] = htonl(0xfe800000); 2294 scope = IFA_LINK; 2295 } else { 2296 scope = IPV6_ADDR_COMPATv4; 2297 } 2298 2299 if (addr.s6_addr32[3]) { 2300 add_addr(idev, &addr, 128, scope); 2301 return; 2302 } 2303 2304 for_each_netdev(net, dev) { 2305 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2306 if (in_dev && (dev->flags & IFF_UP)) { 2307 struct in_ifaddr * ifa; 2308 2309 int flag = scope; 2310 2311 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2312 int plen; 2313 2314 addr.s6_addr32[3] = ifa->ifa_local; 2315 2316 if (ifa->ifa_scope == RT_SCOPE_LINK) 2317 continue; 2318 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2319 if (idev->dev->flags&IFF_POINTOPOINT) 2320 continue; 2321 flag |= IFA_HOST; 2322 } 2323 if (idev->dev->flags&IFF_POINTOPOINT) 2324 plen = 64; 2325 else 2326 plen = 96; 2327 2328 add_addr(idev, &addr, plen, flag); 2329 } 2330 } 2331 } 2332 } 2333 #endif 2334 2335 static void init_loopback(struct net_device *dev) 2336 { 2337 struct inet6_dev *idev; 2338 2339 /* ::1 */ 2340 2341 ASSERT_RTNL(); 2342 2343 if ((idev = ipv6_find_idev(dev)) == NULL) { 2344 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2345 return; 2346 } 2347 2348 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2349 } 2350 2351 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2352 { 2353 struct inet6_ifaddr * ifp; 2354 u32 addr_flags = IFA_F_PERMANENT; 2355 2356 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2357 if (idev->cnf.optimistic_dad && 2358 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2359 addr_flags |= IFA_F_OPTIMISTIC; 2360 #endif 2361 2362 2363 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2364 if (!IS_ERR(ifp)) { 2365 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2366 addrconf_dad_start(ifp, 0); 2367 in6_ifa_put(ifp); 2368 } 2369 } 2370 2371 static void addrconf_dev_config(struct net_device *dev) 2372 { 2373 struct in6_addr addr; 2374 struct inet6_dev * idev; 2375 2376 ASSERT_RTNL(); 2377 2378 if ((dev->type != ARPHRD_ETHER) && 2379 (dev->type != ARPHRD_FDDI) && 2380 (dev->type != ARPHRD_IEEE802_TR) && 2381 (dev->type != ARPHRD_ARCNET) && 2382 (dev->type != ARPHRD_INFINIBAND)) { 2383 /* Alas, we support only Ethernet autoconfiguration. */ 2384 return; 2385 } 2386 2387 idev = addrconf_add_dev(dev); 2388 if (IS_ERR(idev)) 2389 return; 2390 2391 memset(&addr, 0, sizeof(struct in6_addr)); 2392 addr.s6_addr32[0] = htonl(0xFE800000); 2393 2394 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2395 addrconf_add_linklocal(idev, &addr); 2396 } 2397 2398 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2399 static void addrconf_sit_config(struct net_device *dev) 2400 { 2401 struct inet6_dev *idev; 2402 2403 ASSERT_RTNL(); 2404 2405 /* 2406 * Configure the tunnel with one of our IPv4 2407 * addresses... we should configure all of 2408 * our v4 addrs in the tunnel 2409 */ 2410 2411 if ((idev = ipv6_find_idev(dev)) == NULL) { 2412 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2413 return; 2414 } 2415 2416 if (dev->priv_flags & IFF_ISATAP) { 2417 struct in6_addr addr; 2418 2419 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2420 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2421 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2422 addrconf_add_linklocal(idev, &addr); 2423 return; 2424 } 2425 2426 sit_add_v4_addrs(idev); 2427 2428 if (dev->flags&IFF_POINTOPOINT) { 2429 addrconf_add_mroute(dev); 2430 addrconf_add_lroute(dev); 2431 } else 2432 sit_route_add(dev); 2433 } 2434 #endif 2435 2436 static inline int 2437 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2438 { 2439 struct in6_addr lladdr; 2440 2441 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2442 addrconf_add_linklocal(idev, &lladdr); 2443 return 0; 2444 } 2445 return -1; 2446 } 2447 2448 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2449 { 2450 struct net_device *link_dev; 2451 struct net *net = dev_net(idev->dev); 2452 2453 /* first try to inherit the link-local address from the link device */ 2454 if (idev->dev->iflink && 2455 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2456 if (!ipv6_inherit_linklocal(idev, link_dev)) 2457 return; 2458 } 2459 /* then try to inherit it from any device */ 2460 for_each_netdev(net, link_dev) { 2461 if (!ipv6_inherit_linklocal(idev, link_dev)) 2462 return; 2463 } 2464 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2465 } 2466 2467 /* 2468 * Autoconfigure tunnel with a link-local address so routing protocols, 2469 * DHCPv6, MLD etc. can be run over the virtual link 2470 */ 2471 2472 static void addrconf_ip6_tnl_config(struct net_device *dev) 2473 { 2474 struct inet6_dev *idev; 2475 2476 ASSERT_RTNL(); 2477 2478 idev = addrconf_add_dev(dev); 2479 if (IS_ERR(idev)) { 2480 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2481 return; 2482 } 2483 ip6_tnl_add_linklocal(idev); 2484 } 2485 2486 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2487 void * data) 2488 { 2489 struct net_device *dev = (struct net_device *) data; 2490 struct inet6_dev *idev = __in6_dev_get(dev); 2491 int run_pending = 0; 2492 int err; 2493 2494 switch (event) { 2495 case NETDEV_REGISTER: 2496 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2497 idev = ipv6_add_dev(dev); 2498 if (!idev) 2499 return notifier_from_errno(-ENOMEM); 2500 } 2501 break; 2502 2503 case NETDEV_UP: 2504 case NETDEV_CHANGE: 2505 if (dev->flags & IFF_SLAVE) 2506 break; 2507 2508 if (event == NETDEV_UP) { 2509 if (!addrconf_qdisc_ok(dev)) { 2510 /* device is not ready yet. */ 2511 printk(KERN_INFO 2512 "ADDRCONF(NETDEV_UP): %s: " 2513 "link is not ready\n", 2514 dev->name); 2515 break; 2516 } 2517 2518 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2519 idev = ipv6_add_dev(dev); 2520 2521 if (idev) { 2522 idev->if_flags |= IF_READY; 2523 run_pending = 1; 2524 } 2525 } else { 2526 if (!addrconf_qdisc_ok(dev)) { 2527 /* device is still not ready. */ 2528 break; 2529 } 2530 2531 if (idev) { 2532 if (idev->if_flags & IF_READY) 2533 /* device is already configured. */ 2534 break; 2535 idev->if_flags |= IF_READY; 2536 } 2537 2538 printk(KERN_INFO 2539 "ADDRCONF(NETDEV_CHANGE): %s: " 2540 "link becomes ready\n", 2541 dev->name); 2542 2543 run_pending = 1; 2544 } 2545 2546 switch (dev->type) { 2547 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2548 case ARPHRD_SIT: 2549 addrconf_sit_config(dev); 2550 break; 2551 #endif 2552 case ARPHRD_TUNNEL6: 2553 addrconf_ip6_tnl_config(dev); 2554 break; 2555 case ARPHRD_LOOPBACK: 2556 init_loopback(dev); 2557 break; 2558 2559 default: 2560 addrconf_dev_config(dev); 2561 break; 2562 } 2563 2564 if (idev) { 2565 if (run_pending) 2566 addrconf_dad_run(idev); 2567 2568 /* 2569 * If the MTU changed during the interface down, 2570 * when the interface up, the changed MTU must be 2571 * reflected in the idev as well as routers. 2572 */ 2573 if (idev->cnf.mtu6 != dev->mtu && 2574 dev->mtu >= IPV6_MIN_MTU) { 2575 rt6_mtu_change(dev, dev->mtu); 2576 idev->cnf.mtu6 = dev->mtu; 2577 } 2578 idev->tstamp = jiffies; 2579 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2580 2581 /* 2582 * If the changed mtu during down is lower than 2583 * IPV6_MIN_MTU stop IPv6 on this interface. 2584 */ 2585 if (dev->mtu < IPV6_MIN_MTU) 2586 addrconf_ifdown(dev, 1); 2587 } 2588 break; 2589 2590 case NETDEV_CHANGEMTU: 2591 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2592 rt6_mtu_change(dev, dev->mtu); 2593 idev->cnf.mtu6 = dev->mtu; 2594 break; 2595 } 2596 2597 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2598 idev = ipv6_add_dev(dev); 2599 if (idev) 2600 break; 2601 } 2602 2603 /* 2604 * MTU falled under IPV6_MIN_MTU. 2605 * Stop IPv6 on this interface. 2606 */ 2607 2608 case NETDEV_DOWN: 2609 case NETDEV_UNREGISTER: 2610 /* 2611 * Remove all addresses from this interface. 2612 */ 2613 addrconf_ifdown(dev, event != NETDEV_DOWN); 2614 break; 2615 2616 case NETDEV_CHANGENAME: 2617 if (idev) { 2618 snmp6_unregister_dev(idev); 2619 addrconf_sysctl_unregister(idev); 2620 addrconf_sysctl_register(idev); 2621 err = snmp6_register_dev(idev); 2622 if (err) 2623 return notifier_from_errno(err); 2624 } 2625 break; 2626 2627 case NETDEV_PRE_TYPE_CHANGE: 2628 case NETDEV_POST_TYPE_CHANGE: 2629 addrconf_type_change(dev, event); 2630 break; 2631 } 2632 2633 return NOTIFY_OK; 2634 } 2635 2636 /* 2637 * addrconf module should be notified of a device going up 2638 */ 2639 static struct notifier_block ipv6_dev_notf = { 2640 .notifier_call = addrconf_notify, 2641 }; 2642 2643 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2644 { 2645 struct inet6_dev *idev; 2646 ASSERT_RTNL(); 2647 2648 idev = __in6_dev_get(dev); 2649 2650 if (event == NETDEV_POST_TYPE_CHANGE) 2651 ipv6_mc_remap(idev); 2652 else if (event == NETDEV_PRE_TYPE_CHANGE) 2653 ipv6_mc_unmap(idev); 2654 } 2655 2656 static int addrconf_ifdown(struct net_device *dev, int how) 2657 { 2658 struct net *net = dev_net(dev); 2659 struct inet6_dev *idev; 2660 struct inet6_ifaddr *ifa; 2661 LIST_HEAD(keep_list); 2662 int state; 2663 2664 ASSERT_RTNL(); 2665 2666 rt6_ifdown(net, dev); 2667 neigh_ifdown(&nd_tbl, dev); 2668 2669 idev = __in6_dev_get(dev); 2670 if (idev == NULL) 2671 return -ENODEV; 2672 2673 /* 2674 * Step 1: remove reference to ipv6 device from parent device. 2675 * Do not dev_put! 2676 */ 2677 if (how) { 2678 idev->dead = 1; 2679 2680 /* protected by rtnl_lock */ 2681 rcu_assign_pointer(dev->ip6_ptr, NULL); 2682 2683 /* Step 1.5: remove snmp6 entry */ 2684 snmp6_unregister_dev(idev); 2685 2686 } 2687 2688 write_lock_bh(&idev->lock); 2689 2690 /* Step 2: clear flags for stateless addrconf */ 2691 if (!how) 2692 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2693 2694 #ifdef CONFIG_IPV6_PRIVACY 2695 if (how && del_timer(&idev->regen_timer)) 2696 in6_dev_put(idev); 2697 2698 /* Step 3: clear tempaddr list */ 2699 while (!list_empty(&idev->tempaddr_list)) { 2700 ifa = list_first_entry(&idev->tempaddr_list, 2701 struct inet6_ifaddr, tmp_list); 2702 list_del(&ifa->tmp_list); 2703 write_unlock_bh(&idev->lock); 2704 spin_lock_bh(&ifa->lock); 2705 2706 if (ifa->ifpub) { 2707 in6_ifa_put(ifa->ifpub); 2708 ifa->ifpub = NULL; 2709 } 2710 spin_unlock_bh(&ifa->lock); 2711 in6_ifa_put(ifa); 2712 write_lock_bh(&idev->lock); 2713 } 2714 #endif 2715 2716 while (!list_empty(&idev->addr_list)) { 2717 ifa = list_first_entry(&idev->addr_list, 2718 struct inet6_ifaddr, if_list); 2719 addrconf_del_timer(ifa); 2720 2721 /* If just doing link down, and address is permanent 2722 and not link-local, then retain it. */ 2723 if (!how && 2724 (ifa->flags&IFA_F_PERMANENT) && 2725 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) { 2726 list_move_tail(&ifa->if_list, &keep_list); 2727 2728 /* If not doing DAD on this address, just keep it. */ 2729 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) || 2730 idev->cnf.accept_dad <= 0 || 2731 (ifa->flags & IFA_F_NODAD)) 2732 continue; 2733 2734 /* If it was tentative already, no need to notify */ 2735 if (ifa->flags & IFA_F_TENTATIVE) 2736 continue; 2737 2738 /* Flag it for later restoration when link comes up */ 2739 ifa->flags |= IFA_F_TENTATIVE; 2740 ifa->state = INET6_IFADDR_STATE_DAD; 2741 2742 write_unlock_bh(&idev->lock); 2743 2744 in6_ifa_hold(ifa); 2745 } else { 2746 list_del(&ifa->if_list); 2747 2748 /* clear hash table */ 2749 spin_lock_bh(&addrconf_hash_lock); 2750 hlist_del_init_rcu(&ifa->addr_lst); 2751 spin_unlock_bh(&addrconf_hash_lock); 2752 2753 write_unlock_bh(&idev->lock); 2754 spin_lock_bh(&ifa->state_lock); 2755 state = ifa->state; 2756 ifa->state = INET6_IFADDR_STATE_DEAD; 2757 spin_unlock_bh(&ifa->state_lock); 2758 2759 if (state == INET6_IFADDR_STATE_DEAD) 2760 goto put_ifa; 2761 } 2762 2763 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2764 if (ifa->state == INET6_IFADDR_STATE_DEAD) 2765 atomic_notifier_call_chain(&inet6addr_chain, 2766 NETDEV_DOWN, ifa); 2767 2768 put_ifa: 2769 in6_ifa_put(ifa); 2770 2771 write_lock_bh(&idev->lock); 2772 } 2773 2774 list_splice(&keep_list, &idev->addr_list); 2775 2776 write_unlock_bh(&idev->lock); 2777 2778 /* Step 5: Discard multicast list */ 2779 if (how) 2780 ipv6_mc_destroy_dev(idev); 2781 else 2782 ipv6_mc_down(idev); 2783 2784 idev->tstamp = jiffies; 2785 2786 /* Last: Shot the device (if unregistered) */ 2787 if (how) { 2788 addrconf_sysctl_unregister(idev); 2789 neigh_parms_release(&nd_tbl, idev->nd_parms); 2790 neigh_ifdown(&nd_tbl, dev); 2791 in6_dev_put(idev); 2792 } 2793 return 0; 2794 } 2795 2796 static void addrconf_rs_timer(unsigned long data) 2797 { 2798 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2799 struct inet6_dev *idev = ifp->idev; 2800 2801 read_lock(&idev->lock); 2802 if (idev->dead || !(idev->if_flags & IF_READY)) 2803 goto out; 2804 2805 if (idev->cnf.forwarding) 2806 goto out; 2807 2808 /* Announcement received after solicitation was sent */ 2809 if (idev->if_flags & IF_RA_RCVD) 2810 goto out; 2811 2812 spin_lock(&ifp->lock); 2813 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2814 /* The wait after the last probe can be shorter */ 2815 addrconf_mod_timer(ifp, AC_RS, 2816 (ifp->probes == idev->cnf.rtr_solicits) ? 2817 idev->cnf.rtr_solicit_delay : 2818 idev->cnf.rtr_solicit_interval); 2819 spin_unlock(&ifp->lock); 2820 2821 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2822 } else { 2823 spin_unlock(&ifp->lock); 2824 /* 2825 * Note: we do not support deprecated "all on-link" 2826 * assumption any longer. 2827 */ 2828 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2829 idev->dev->name); 2830 } 2831 2832 out: 2833 read_unlock(&idev->lock); 2834 in6_ifa_put(ifp); 2835 } 2836 2837 /* 2838 * Duplicate Address Detection 2839 */ 2840 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2841 { 2842 unsigned long rand_num; 2843 struct inet6_dev *idev = ifp->idev; 2844 2845 if (ifp->flags & IFA_F_OPTIMISTIC) 2846 rand_num = 0; 2847 else 2848 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2849 2850 ifp->probes = idev->cnf.dad_transmits; 2851 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2852 } 2853 2854 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2855 { 2856 struct inet6_dev *idev = ifp->idev; 2857 struct net_device *dev = idev->dev; 2858 2859 addrconf_join_solict(dev, &ifp->addr); 2860 2861 net_srandom(ifp->addr.s6_addr32[3]); 2862 2863 read_lock_bh(&idev->lock); 2864 spin_lock(&ifp->lock); 2865 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2866 goto out; 2867 2868 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2869 idev->cnf.accept_dad < 1 || 2870 !(ifp->flags&IFA_F_TENTATIVE) || 2871 ifp->flags & IFA_F_NODAD) { 2872 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2873 spin_unlock(&ifp->lock); 2874 read_unlock_bh(&idev->lock); 2875 2876 addrconf_dad_completed(ifp); 2877 return; 2878 } 2879 2880 if (!(idev->if_flags & IF_READY)) { 2881 spin_unlock(&ifp->lock); 2882 read_unlock_bh(&idev->lock); 2883 /* 2884 * If the device is not ready: 2885 * - keep it tentative if it is a permanent address. 2886 * - otherwise, kill it. 2887 */ 2888 in6_ifa_hold(ifp); 2889 addrconf_dad_stop(ifp, 0); 2890 return; 2891 } 2892 2893 /* 2894 * Optimistic nodes can start receiving 2895 * Frames right away 2896 */ 2897 if (ifp->flags & IFA_F_OPTIMISTIC) 2898 ip6_ins_rt(ifp->rt); 2899 2900 addrconf_dad_kick(ifp); 2901 out: 2902 spin_unlock(&ifp->lock); 2903 read_unlock_bh(&idev->lock); 2904 } 2905 2906 static void addrconf_dad_timer(unsigned long data) 2907 { 2908 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2909 struct inet6_dev *idev = ifp->idev; 2910 struct in6_addr mcaddr; 2911 2912 if (!ifp->probes && addrconf_dad_end(ifp)) 2913 goto out; 2914 2915 read_lock(&idev->lock); 2916 if (idev->dead || !(idev->if_flags & IF_READY)) { 2917 read_unlock(&idev->lock); 2918 goto out; 2919 } 2920 2921 spin_lock(&ifp->lock); 2922 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2923 spin_unlock(&ifp->lock); 2924 read_unlock(&idev->lock); 2925 goto out; 2926 } 2927 2928 if (ifp->probes == 0) { 2929 /* 2930 * DAD was successful 2931 */ 2932 2933 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2934 spin_unlock(&ifp->lock); 2935 read_unlock(&idev->lock); 2936 2937 addrconf_dad_completed(ifp); 2938 2939 goto out; 2940 } 2941 2942 ifp->probes--; 2943 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2944 spin_unlock(&ifp->lock); 2945 read_unlock(&idev->lock); 2946 2947 /* send a neighbour solicitation for our addr */ 2948 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2949 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2950 out: 2951 in6_ifa_put(ifp); 2952 } 2953 2954 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2955 { 2956 struct net_device *dev = ifp->idev->dev; 2957 2958 /* 2959 * Configure the address for reception. Now it is valid. 2960 */ 2961 2962 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2963 2964 /* If added prefix is link local and forwarding is off, 2965 start sending router solicitations. 2966 */ 2967 2968 if ((ifp->idev->cnf.forwarding == 0 || 2969 ifp->idev->cnf.forwarding == 2) && 2970 ifp->idev->cnf.rtr_solicits > 0 && 2971 (dev->flags&IFF_LOOPBACK) == 0 && 2972 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2973 /* 2974 * If a host as already performed a random delay 2975 * [...] as part of DAD [...] there is no need 2976 * to delay again before sending the first RS 2977 */ 2978 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2979 2980 spin_lock_bh(&ifp->lock); 2981 ifp->probes = 1; 2982 ifp->idev->if_flags |= IF_RS_SENT; 2983 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2984 spin_unlock_bh(&ifp->lock); 2985 } 2986 } 2987 2988 static void addrconf_dad_run(struct inet6_dev *idev) 2989 { 2990 struct inet6_ifaddr *ifp; 2991 2992 read_lock_bh(&idev->lock); 2993 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2994 spin_lock(&ifp->lock); 2995 if (ifp->flags & IFA_F_TENTATIVE && 2996 ifp->state == INET6_IFADDR_STATE_DAD) 2997 addrconf_dad_kick(ifp); 2998 spin_unlock(&ifp->lock); 2999 } 3000 read_unlock_bh(&idev->lock); 3001 } 3002 3003 #ifdef CONFIG_PROC_FS 3004 struct if6_iter_state { 3005 struct seq_net_private p; 3006 int bucket; 3007 }; 3008 3009 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 3010 { 3011 struct inet6_ifaddr *ifa = NULL; 3012 struct if6_iter_state *state = seq->private; 3013 struct net *net = seq_file_net(seq); 3014 3015 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3016 struct hlist_node *n; 3017 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3018 addr_lst) 3019 if (net_eq(dev_net(ifa->idev->dev), net)) 3020 return ifa; 3021 } 3022 return NULL; 3023 } 3024 3025 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3026 struct inet6_ifaddr *ifa) 3027 { 3028 struct if6_iter_state *state = seq->private; 3029 struct net *net = seq_file_net(seq); 3030 struct hlist_node *n = &ifa->addr_lst; 3031 3032 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) 3033 if (net_eq(dev_net(ifa->idev->dev), net)) 3034 return ifa; 3035 3036 while (++state->bucket < IN6_ADDR_HSIZE) { 3037 hlist_for_each_entry_rcu_bh(ifa, n, 3038 &inet6_addr_lst[state->bucket], addr_lst) { 3039 if (net_eq(dev_net(ifa->idev->dev), net)) 3040 return ifa; 3041 } 3042 } 3043 3044 return NULL; 3045 } 3046 3047 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3048 { 3049 struct inet6_ifaddr *ifa = if6_get_first(seq); 3050 3051 if (ifa) 3052 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3053 --pos; 3054 return pos ? NULL : ifa; 3055 } 3056 3057 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3058 __acquires(rcu_bh) 3059 { 3060 rcu_read_lock_bh(); 3061 return if6_get_idx(seq, *pos); 3062 } 3063 3064 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3065 { 3066 struct inet6_ifaddr *ifa; 3067 3068 ifa = if6_get_next(seq, v); 3069 ++*pos; 3070 return ifa; 3071 } 3072 3073 static void if6_seq_stop(struct seq_file *seq, void *v) 3074 __releases(rcu_bh) 3075 { 3076 rcu_read_unlock_bh(); 3077 } 3078 3079 static int if6_seq_show(struct seq_file *seq, void *v) 3080 { 3081 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3082 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3083 &ifp->addr, 3084 ifp->idev->dev->ifindex, 3085 ifp->prefix_len, 3086 ifp->scope, 3087 ifp->flags, 3088 ifp->idev->dev->name); 3089 return 0; 3090 } 3091 3092 static const struct seq_operations if6_seq_ops = { 3093 .start = if6_seq_start, 3094 .next = if6_seq_next, 3095 .show = if6_seq_show, 3096 .stop = if6_seq_stop, 3097 }; 3098 3099 static int if6_seq_open(struct inode *inode, struct file *file) 3100 { 3101 return seq_open_net(inode, file, &if6_seq_ops, 3102 sizeof(struct if6_iter_state)); 3103 } 3104 3105 static const struct file_operations if6_fops = { 3106 .owner = THIS_MODULE, 3107 .open = if6_seq_open, 3108 .read = seq_read, 3109 .llseek = seq_lseek, 3110 .release = seq_release_net, 3111 }; 3112 3113 static int __net_init if6_proc_net_init(struct net *net) 3114 { 3115 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3116 return -ENOMEM; 3117 return 0; 3118 } 3119 3120 static void __net_exit if6_proc_net_exit(struct net *net) 3121 { 3122 proc_net_remove(net, "if_inet6"); 3123 } 3124 3125 static struct pernet_operations if6_proc_net_ops = { 3126 .init = if6_proc_net_init, 3127 .exit = if6_proc_net_exit, 3128 }; 3129 3130 int __init if6_proc_init(void) 3131 { 3132 return register_pernet_subsys(&if6_proc_net_ops); 3133 } 3134 3135 void if6_proc_exit(void) 3136 { 3137 unregister_pernet_subsys(&if6_proc_net_ops); 3138 } 3139 #endif /* CONFIG_PROC_FS */ 3140 3141 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3142 /* Check if address is a home address configured on any interface. */ 3143 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3144 { 3145 int ret = 0; 3146 struct inet6_ifaddr *ifp = NULL; 3147 struct hlist_node *n; 3148 unsigned int hash = ipv6_addr_hash(addr); 3149 3150 rcu_read_lock_bh(); 3151 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3152 if (!net_eq(dev_net(ifp->idev->dev), net)) 3153 continue; 3154 if (ipv6_addr_equal(&ifp->addr, addr) && 3155 (ifp->flags & IFA_F_HOMEADDRESS)) { 3156 ret = 1; 3157 break; 3158 } 3159 } 3160 rcu_read_unlock_bh(); 3161 return ret; 3162 } 3163 #endif 3164 3165 /* 3166 * Periodic address status verification 3167 */ 3168 3169 static void addrconf_verify(unsigned long foo) 3170 { 3171 unsigned long now, next, next_sec, next_sched; 3172 struct inet6_ifaddr *ifp; 3173 struct hlist_node *node; 3174 int i; 3175 3176 rcu_read_lock_bh(); 3177 spin_lock(&addrconf_verify_lock); 3178 now = jiffies; 3179 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3180 3181 del_timer(&addr_chk_timer); 3182 3183 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3184 restart: 3185 hlist_for_each_entry_rcu_bh(ifp, node, 3186 &inet6_addr_lst[i], addr_lst) { 3187 unsigned long age; 3188 3189 if (ifp->flags & IFA_F_PERMANENT) 3190 continue; 3191 3192 spin_lock(&ifp->lock); 3193 /* We try to batch several events at once. */ 3194 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3195 3196 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3197 age >= ifp->valid_lft) { 3198 spin_unlock(&ifp->lock); 3199 in6_ifa_hold(ifp); 3200 ipv6_del_addr(ifp); 3201 goto restart; 3202 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3203 spin_unlock(&ifp->lock); 3204 continue; 3205 } else if (age >= ifp->prefered_lft) { 3206 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3207 int deprecate = 0; 3208 3209 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3210 deprecate = 1; 3211 ifp->flags |= IFA_F_DEPRECATED; 3212 } 3213 3214 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3215 next = ifp->tstamp + ifp->valid_lft * HZ; 3216 3217 spin_unlock(&ifp->lock); 3218 3219 if (deprecate) { 3220 in6_ifa_hold(ifp); 3221 3222 ipv6_ifa_notify(0, ifp); 3223 in6_ifa_put(ifp); 3224 goto restart; 3225 } 3226 #ifdef CONFIG_IPV6_PRIVACY 3227 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3228 !(ifp->flags&IFA_F_TENTATIVE)) { 3229 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3230 ifp->idev->cnf.dad_transmits * 3231 ifp->idev->nd_parms->retrans_time / HZ; 3232 3233 if (age >= ifp->prefered_lft - regen_advance) { 3234 struct inet6_ifaddr *ifpub = ifp->ifpub; 3235 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3236 next = ifp->tstamp + ifp->prefered_lft * HZ; 3237 if (!ifp->regen_count && ifpub) { 3238 ifp->regen_count++; 3239 in6_ifa_hold(ifp); 3240 in6_ifa_hold(ifpub); 3241 spin_unlock(&ifp->lock); 3242 3243 spin_lock(&ifpub->lock); 3244 ifpub->regen_count = 0; 3245 spin_unlock(&ifpub->lock); 3246 ipv6_create_tempaddr(ifpub, ifp); 3247 in6_ifa_put(ifpub); 3248 in6_ifa_put(ifp); 3249 goto restart; 3250 } 3251 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3252 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3253 spin_unlock(&ifp->lock); 3254 #endif 3255 } else { 3256 /* ifp->prefered_lft <= ifp->valid_lft */ 3257 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3258 next = ifp->tstamp + ifp->prefered_lft * HZ; 3259 spin_unlock(&ifp->lock); 3260 } 3261 } 3262 } 3263 3264 next_sec = round_jiffies_up(next); 3265 next_sched = next; 3266 3267 /* If rounded timeout is accurate enough, accept it. */ 3268 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3269 next_sched = next_sec; 3270 3271 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3272 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3273 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3274 3275 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3276 now, next, next_sec, next_sched)); 3277 3278 addr_chk_timer.expires = next_sched; 3279 add_timer(&addr_chk_timer); 3280 spin_unlock(&addrconf_verify_lock); 3281 rcu_read_unlock_bh(); 3282 } 3283 3284 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3285 { 3286 struct in6_addr *pfx = NULL; 3287 3288 if (addr) 3289 pfx = nla_data(addr); 3290 3291 if (local) { 3292 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3293 pfx = NULL; 3294 else 3295 pfx = nla_data(local); 3296 } 3297 3298 return pfx; 3299 } 3300 3301 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3302 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3303 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3304 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3305 }; 3306 3307 static int 3308 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3309 { 3310 struct net *net = sock_net(skb->sk); 3311 struct ifaddrmsg *ifm; 3312 struct nlattr *tb[IFA_MAX+1]; 3313 struct in6_addr *pfx; 3314 int err; 3315 3316 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3317 if (err < 0) 3318 return err; 3319 3320 ifm = nlmsg_data(nlh); 3321 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3322 if (pfx == NULL) 3323 return -EINVAL; 3324 3325 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3326 } 3327 3328 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3329 u32 prefered_lft, u32 valid_lft) 3330 { 3331 u32 flags; 3332 clock_t expires; 3333 unsigned long timeout; 3334 3335 if (!valid_lft || (prefered_lft > valid_lft)) 3336 return -EINVAL; 3337 3338 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3339 if (addrconf_finite_timeout(timeout)) { 3340 expires = jiffies_to_clock_t(timeout * HZ); 3341 valid_lft = timeout; 3342 flags = RTF_EXPIRES; 3343 } else { 3344 expires = 0; 3345 flags = 0; 3346 ifa_flags |= IFA_F_PERMANENT; 3347 } 3348 3349 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3350 if (addrconf_finite_timeout(timeout)) { 3351 if (timeout == 0) 3352 ifa_flags |= IFA_F_DEPRECATED; 3353 prefered_lft = timeout; 3354 } 3355 3356 spin_lock_bh(&ifp->lock); 3357 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3358 ifp->tstamp = jiffies; 3359 ifp->valid_lft = valid_lft; 3360 ifp->prefered_lft = prefered_lft; 3361 3362 spin_unlock_bh(&ifp->lock); 3363 if (!(ifp->flags&IFA_F_TENTATIVE)) 3364 ipv6_ifa_notify(0, ifp); 3365 3366 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3367 expires, flags); 3368 addrconf_verify(0); 3369 3370 return 0; 3371 } 3372 3373 static int 3374 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3375 { 3376 struct net *net = sock_net(skb->sk); 3377 struct ifaddrmsg *ifm; 3378 struct nlattr *tb[IFA_MAX+1]; 3379 struct in6_addr *pfx; 3380 struct inet6_ifaddr *ifa; 3381 struct net_device *dev; 3382 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3383 u8 ifa_flags; 3384 int err; 3385 3386 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3387 if (err < 0) 3388 return err; 3389 3390 ifm = nlmsg_data(nlh); 3391 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3392 if (pfx == NULL) 3393 return -EINVAL; 3394 3395 if (tb[IFA_CACHEINFO]) { 3396 struct ifa_cacheinfo *ci; 3397 3398 ci = nla_data(tb[IFA_CACHEINFO]); 3399 valid_lft = ci->ifa_valid; 3400 preferred_lft = ci->ifa_prefered; 3401 } else { 3402 preferred_lft = INFINITY_LIFE_TIME; 3403 valid_lft = INFINITY_LIFE_TIME; 3404 } 3405 3406 dev = __dev_get_by_index(net, ifm->ifa_index); 3407 if (dev == NULL) 3408 return -ENODEV; 3409 3410 /* We ignore other flags so far. */ 3411 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3412 3413 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3414 if (ifa == NULL) { 3415 /* 3416 * It would be best to check for !NLM_F_CREATE here but 3417 * userspace alreay relies on not having to provide this. 3418 */ 3419 return inet6_addr_add(net, ifm->ifa_index, pfx, 3420 ifm->ifa_prefixlen, ifa_flags, 3421 preferred_lft, valid_lft); 3422 } 3423 3424 if (nlh->nlmsg_flags & NLM_F_EXCL || 3425 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3426 err = -EEXIST; 3427 else 3428 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3429 3430 in6_ifa_put(ifa); 3431 3432 return err; 3433 } 3434 3435 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3436 u8 scope, int ifindex) 3437 { 3438 struct ifaddrmsg *ifm; 3439 3440 ifm = nlmsg_data(nlh); 3441 ifm->ifa_family = AF_INET6; 3442 ifm->ifa_prefixlen = prefixlen; 3443 ifm->ifa_flags = flags; 3444 ifm->ifa_scope = scope; 3445 ifm->ifa_index = ifindex; 3446 } 3447 3448 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3449 unsigned long tstamp, u32 preferred, u32 valid) 3450 { 3451 struct ifa_cacheinfo ci; 3452 3453 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3454 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3455 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3456 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3457 ci.ifa_prefered = preferred; 3458 ci.ifa_valid = valid; 3459 3460 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3461 } 3462 3463 static inline int rt_scope(int ifa_scope) 3464 { 3465 if (ifa_scope & IFA_HOST) 3466 return RT_SCOPE_HOST; 3467 else if (ifa_scope & IFA_LINK) 3468 return RT_SCOPE_LINK; 3469 else if (ifa_scope & IFA_SITE) 3470 return RT_SCOPE_SITE; 3471 else 3472 return RT_SCOPE_UNIVERSE; 3473 } 3474 3475 static inline int inet6_ifaddr_msgsize(void) 3476 { 3477 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3478 + nla_total_size(16) /* IFA_ADDRESS */ 3479 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3480 } 3481 3482 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3483 u32 pid, u32 seq, int event, unsigned int flags) 3484 { 3485 struct nlmsghdr *nlh; 3486 u32 preferred, valid; 3487 3488 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3489 if (nlh == NULL) 3490 return -EMSGSIZE; 3491 3492 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3493 ifa->idev->dev->ifindex); 3494 3495 if (!(ifa->flags&IFA_F_PERMANENT)) { 3496 preferred = ifa->prefered_lft; 3497 valid = ifa->valid_lft; 3498 if (preferred != INFINITY_LIFE_TIME) { 3499 long tval = (jiffies - ifa->tstamp)/HZ; 3500 if (preferred > tval) 3501 preferred -= tval; 3502 else 3503 preferred = 0; 3504 if (valid != INFINITY_LIFE_TIME) { 3505 if (valid > tval) 3506 valid -= tval; 3507 else 3508 valid = 0; 3509 } 3510 } 3511 } else { 3512 preferred = INFINITY_LIFE_TIME; 3513 valid = INFINITY_LIFE_TIME; 3514 } 3515 3516 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3517 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3518 nlmsg_cancel(skb, nlh); 3519 return -EMSGSIZE; 3520 } 3521 3522 return nlmsg_end(skb, nlh); 3523 } 3524 3525 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3526 u32 pid, u32 seq, int event, u16 flags) 3527 { 3528 struct nlmsghdr *nlh; 3529 u8 scope = RT_SCOPE_UNIVERSE; 3530 int ifindex = ifmca->idev->dev->ifindex; 3531 3532 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3533 scope = RT_SCOPE_SITE; 3534 3535 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3536 if (nlh == NULL) 3537 return -EMSGSIZE; 3538 3539 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3540 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3541 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3542 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3543 nlmsg_cancel(skb, nlh); 3544 return -EMSGSIZE; 3545 } 3546 3547 return nlmsg_end(skb, nlh); 3548 } 3549 3550 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3551 u32 pid, u32 seq, int event, unsigned int flags) 3552 { 3553 struct nlmsghdr *nlh; 3554 u8 scope = RT_SCOPE_UNIVERSE; 3555 int ifindex = ifaca->aca_idev->dev->ifindex; 3556 3557 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3558 scope = RT_SCOPE_SITE; 3559 3560 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3561 if (nlh == NULL) 3562 return -EMSGSIZE; 3563 3564 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3565 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3566 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3567 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3568 nlmsg_cancel(skb, nlh); 3569 return -EMSGSIZE; 3570 } 3571 3572 return nlmsg_end(skb, nlh); 3573 } 3574 3575 enum addr_type_t { 3576 UNICAST_ADDR, 3577 MULTICAST_ADDR, 3578 ANYCAST_ADDR, 3579 }; 3580 3581 /* called with rcu_read_lock() */ 3582 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3583 struct netlink_callback *cb, enum addr_type_t type, 3584 int s_ip_idx, int *p_ip_idx) 3585 { 3586 struct ifmcaddr6 *ifmca; 3587 struct ifacaddr6 *ifaca; 3588 int err = 1; 3589 int ip_idx = *p_ip_idx; 3590 3591 read_lock_bh(&idev->lock); 3592 switch (type) { 3593 case UNICAST_ADDR: { 3594 struct inet6_ifaddr *ifa; 3595 3596 /* unicast address incl. temp addr */ 3597 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3598 if (++ip_idx < s_ip_idx) 3599 continue; 3600 err = inet6_fill_ifaddr(skb, ifa, 3601 NETLINK_CB(cb->skb).pid, 3602 cb->nlh->nlmsg_seq, 3603 RTM_NEWADDR, 3604 NLM_F_MULTI); 3605 if (err <= 0) 3606 break; 3607 } 3608 break; 3609 } 3610 case MULTICAST_ADDR: 3611 /* multicast address */ 3612 for (ifmca = idev->mc_list; ifmca; 3613 ifmca = ifmca->next, ip_idx++) { 3614 if (ip_idx < s_ip_idx) 3615 continue; 3616 err = inet6_fill_ifmcaddr(skb, ifmca, 3617 NETLINK_CB(cb->skb).pid, 3618 cb->nlh->nlmsg_seq, 3619 RTM_GETMULTICAST, 3620 NLM_F_MULTI); 3621 if (err <= 0) 3622 break; 3623 } 3624 break; 3625 case ANYCAST_ADDR: 3626 /* anycast address */ 3627 for (ifaca = idev->ac_list; ifaca; 3628 ifaca = ifaca->aca_next, ip_idx++) { 3629 if (ip_idx < s_ip_idx) 3630 continue; 3631 err = inet6_fill_ifacaddr(skb, ifaca, 3632 NETLINK_CB(cb->skb).pid, 3633 cb->nlh->nlmsg_seq, 3634 RTM_GETANYCAST, 3635 NLM_F_MULTI); 3636 if (err <= 0) 3637 break; 3638 } 3639 break; 3640 default: 3641 break; 3642 } 3643 read_unlock_bh(&idev->lock); 3644 *p_ip_idx = ip_idx; 3645 return err; 3646 } 3647 3648 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3649 enum addr_type_t type) 3650 { 3651 struct net *net = sock_net(skb->sk); 3652 int h, s_h; 3653 int idx, ip_idx; 3654 int s_idx, s_ip_idx; 3655 struct net_device *dev; 3656 struct inet6_dev *idev; 3657 struct hlist_head *head; 3658 struct hlist_node *node; 3659 3660 s_h = cb->args[0]; 3661 s_idx = idx = cb->args[1]; 3662 s_ip_idx = ip_idx = cb->args[2]; 3663 3664 rcu_read_lock(); 3665 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3666 idx = 0; 3667 head = &net->dev_index_head[h]; 3668 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3669 if (idx < s_idx) 3670 goto cont; 3671 if (h > s_h || idx > s_idx) 3672 s_ip_idx = 0; 3673 ip_idx = 0; 3674 idev = __in6_dev_get(dev); 3675 if (!idev) 3676 goto cont; 3677 3678 if (in6_dump_addrs(idev, skb, cb, type, 3679 s_ip_idx, &ip_idx) <= 0) 3680 goto done; 3681 cont: 3682 idx++; 3683 } 3684 } 3685 done: 3686 rcu_read_unlock(); 3687 cb->args[0] = h; 3688 cb->args[1] = idx; 3689 cb->args[2] = ip_idx; 3690 3691 return skb->len; 3692 } 3693 3694 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3695 { 3696 enum addr_type_t type = UNICAST_ADDR; 3697 3698 return inet6_dump_addr(skb, cb, type); 3699 } 3700 3701 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3702 { 3703 enum addr_type_t type = MULTICAST_ADDR; 3704 3705 return inet6_dump_addr(skb, cb, type); 3706 } 3707 3708 3709 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3710 { 3711 enum addr_type_t type = ANYCAST_ADDR; 3712 3713 return inet6_dump_addr(skb, cb, type); 3714 } 3715 3716 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3717 void *arg) 3718 { 3719 struct net *net = sock_net(in_skb->sk); 3720 struct ifaddrmsg *ifm; 3721 struct nlattr *tb[IFA_MAX+1]; 3722 struct in6_addr *addr = NULL; 3723 struct net_device *dev = NULL; 3724 struct inet6_ifaddr *ifa; 3725 struct sk_buff *skb; 3726 int err; 3727 3728 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3729 if (err < 0) 3730 goto errout; 3731 3732 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3733 if (addr == NULL) { 3734 err = -EINVAL; 3735 goto errout; 3736 } 3737 3738 ifm = nlmsg_data(nlh); 3739 if (ifm->ifa_index) 3740 dev = __dev_get_by_index(net, ifm->ifa_index); 3741 3742 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3743 if (!ifa) { 3744 err = -EADDRNOTAVAIL; 3745 goto errout; 3746 } 3747 3748 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3749 if (!skb) { 3750 err = -ENOBUFS; 3751 goto errout_ifa; 3752 } 3753 3754 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3755 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3756 if (err < 0) { 3757 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3758 WARN_ON(err == -EMSGSIZE); 3759 kfree_skb(skb); 3760 goto errout_ifa; 3761 } 3762 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3763 errout_ifa: 3764 in6_ifa_put(ifa); 3765 errout: 3766 return err; 3767 } 3768 3769 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3770 { 3771 struct sk_buff *skb; 3772 struct net *net = dev_net(ifa->idev->dev); 3773 int err = -ENOBUFS; 3774 3775 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3776 if (skb == NULL) 3777 goto errout; 3778 3779 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3780 if (err < 0) { 3781 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3782 WARN_ON(err == -EMSGSIZE); 3783 kfree_skb(skb); 3784 goto errout; 3785 } 3786 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3787 return; 3788 errout: 3789 if (err < 0) 3790 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3791 } 3792 3793 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3794 __s32 *array, int bytes) 3795 { 3796 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3797 3798 memset(array, 0, bytes); 3799 array[DEVCONF_FORWARDING] = cnf->forwarding; 3800 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3801 array[DEVCONF_MTU6] = cnf->mtu6; 3802 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3803 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3804 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3805 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3806 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3807 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3808 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3809 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3810 #ifdef CONFIG_IPV6_PRIVACY 3811 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3812 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3813 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3814 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3815 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3816 #endif 3817 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3818 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3819 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3820 #ifdef CONFIG_IPV6_ROUTER_PREF 3821 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3822 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3823 #ifdef CONFIG_IPV6_ROUTE_INFO 3824 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3825 #endif 3826 #endif 3827 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3828 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3829 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3830 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3831 #endif 3832 #ifdef CONFIG_IPV6_MROUTE 3833 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3834 #endif 3835 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3836 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3837 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3838 } 3839 3840 static inline size_t inet6_if_nlmsg_size(void) 3841 { 3842 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3843 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3844 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3845 + nla_total_size(4) /* IFLA_MTU */ 3846 + nla_total_size(4) /* IFLA_LINK */ 3847 + nla_total_size( /* IFLA_PROTINFO */ 3848 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3849 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3850 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3851 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3852 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3853 ); 3854 } 3855 3856 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib, 3857 int items, int bytes) 3858 { 3859 int i; 3860 int pad = bytes - sizeof(u64) * items; 3861 BUG_ON(pad < 0); 3862 3863 /* Use put_unaligned() because stats may not be aligned for u64. */ 3864 put_unaligned(items, &stats[0]); 3865 for (i = 1; i < items; i++) 3866 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3867 3868 memset(&stats[items], 0, pad); 3869 } 3870 3871 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3872 int items, int bytes, size_t syncpoff) 3873 { 3874 int i; 3875 int pad = bytes - sizeof(u64) * items; 3876 BUG_ON(pad < 0); 3877 3878 /* Use put_unaligned() because stats may not be aligned for u64. */ 3879 put_unaligned(items, &stats[0]); 3880 for (i = 1; i < items; i++) 3881 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3882 3883 memset(&stats[items], 0, pad); 3884 } 3885 3886 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3887 int bytes) 3888 { 3889 switch (attrtype) { 3890 case IFLA_INET6_STATS: 3891 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3892 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3893 break; 3894 case IFLA_INET6_ICMP6STATS: 3895 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3896 break; 3897 } 3898 } 3899 3900 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3901 u32 pid, u32 seq, int event, unsigned int flags) 3902 { 3903 struct net_device *dev = idev->dev; 3904 struct nlattr *nla; 3905 struct ifinfomsg *hdr; 3906 struct nlmsghdr *nlh; 3907 void *protoinfo; 3908 struct ifla_cacheinfo ci; 3909 3910 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3911 if (nlh == NULL) 3912 return -EMSGSIZE; 3913 3914 hdr = nlmsg_data(nlh); 3915 hdr->ifi_family = AF_INET6; 3916 hdr->__ifi_pad = 0; 3917 hdr->ifi_type = dev->type; 3918 hdr->ifi_index = dev->ifindex; 3919 hdr->ifi_flags = dev_get_flags(dev); 3920 hdr->ifi_change = 0; 3921 3922 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3923 3924 if (dev->addr_len) 3925 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3926 3927 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3928 if (dev->ifindex != dev->iflink) 3929 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3930 3931 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3932 if (protoinfo == NULL) 3933 goto nla_put_failure; 3934 3935 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3936 3937 ci.max_reasm_len = IPV6_MAXPLEN; 3938 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3939 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3940 ci.reachable_time = idev->nd_parms->reachable_time; 3941 ci.retrans_time = idev->nd_parms->retrans_time; 3942 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3943 3944 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3945 if (nla == NULL) 3946 goto nla_put_failure; 3947 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3948 3949 /* XXX - MC not implemented */ 3950 3951 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3952 if (nla == NULL) 3953 goto nla_put_failure; 3954 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3955 3956 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3957 if (nla == NULL) 3958 goto nla_put_failure; 3959 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3960 3961 nla_nest_end(skb, protoinfo); 3962 return nlmsg_end(skb, nlh); 3963 3964 nla_put_failure: 3965 nlmsg_cancel(skb, nlh); 3966 return -EMSGSIZE; 3967 } 3968 3969 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3970 { 3971 struct net *net = sock_net(skb->sk); 3972 int h, s_h; 3973 int idx = 0, s_idx; 3974 struct net_device *dev; 3975 struct inet6_dev *idev; 3976 struct hlist_head *head; 3977 struct hlist_node *node; 3978 3979 s_h = cb->args[0]; 3980 s_idx = cb->args[1]; 3981 3982 rcu_read_lock(); 3983 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3984 idx = 0; 3985 head = &net->dev_index_head[h]; 3986 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3987 if (idx < s_idx) 3988 goto cont; 3989 idev = __in6_dev_get(dev); 3990 if (!idev) 3991 goto cont; 3992 if (inet6_fill_ifinfo(skb, idev, 3993 NETLINK_CB(cb->skb).pid, 3994 cb->nlh->nlmsg_seq, 3995 RTM_NEWLINK, NLM_F_MULTI) <= 0) 3996 goto out; 3997 cont: 3998 idx++; 3999 } 4000 } 4001 out: 4002 rcu_read_unlock(); 4003 cb->args[1] = idx; 4004 cb->args[0] = h; 4005 4006 return skb->len; 4007 } 4008 4009 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4010 { 4011 struct sk_buff *skb; 4012 struct net *net = dev_net(idev->dev); 4013 int err = -ENOBUFS; 4014 4015 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4016 if (skb == NULL) 4017 goto errout; 4018 4019 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4020 if (err < 0) { 4021 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4022 WARN_ON(err == -EMSGSIZE); 4023 kfree_skb(skb); 4024 goto errout; 4025 } 4026 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4027 return; 4028 errout: 4029 if (err < 0) 4030 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4031 } 4032 4033 static inline size_t inet6_prefix_nlmsg_size(void) 4034 { 4035 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4036 + nla_total_size(sizeof(struct in6_addr)) 4037 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4038 } 4039 4040 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4041 struct prefix_info *pinfo, u32 pid, u32 seq, 4042 int event, unsigned int flags) 4043 { 4044 struct prefixmsg *pmsg; 4045 struct nlmsghdr *nlh; 4046 struct prefix_cacheinfo ci; 4047 4048 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4049 if (nlh == NULL) 4050 return -EMSGSIZE; 4051 4052 pmsg = nlmsg_data(nlh); 4053 pmsg->prefix_family = AF_INET6; 4054 pmsg->prefix_pad1 = 0; 4055 pmsg->prefix_pad2 = 0; 4056 pmsg->prefix_ifindex = idev->dev->ifindex; 4057 pmsg->prefix_len = pinfo->prefix_len; 4058 pmsg->prefix_type = pinfo->type; 4059 pmsg->prefix_pad3 = 0; 4060 pmsg->prefix_flags = 0; 4061 if (pinfo->onlink) 4062 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4063 if (pinfo->autoconf) 4064 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4065 4066 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4067 4068 ci.preferred_time = ntohl(pinfo->prefered); 4069 ci.valid_time = ntohl(pinfo->valid); 4070 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4071 4072 return nlmsg_end(skb, nlh); 4073 4074 nla_put_failure: 4075 nlmsg_cancel(skb, nlh); 4076 return -EMSGSIZE; 4077 } 4078 4079 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4080 struct prefix_info *pinfo) 4081 { 4082 struct sk_buff *skb; 4083 struct net *net = dev_net(idev->dev); 4084 int err = -ENOBUFS; 4085 4086 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4087 if (skb == NULL) 4088 goto errout; 4089 4090 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4091 if (err < 0) { 4092 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4093 WARN_ON(err == -EMSGSIZE); 4094 kfree_skb(skb); 4095 goto errout; 4096 } 4097 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4098 return; 4099 errout: 4100 if (err < 0) 4101 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4102 } 4103 4104 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4105 { 4106 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4107 4108 switch (event) { 4109 case RTM_NEWADDR: 4110 /* 4111 * If the address was optimistic 4112 * we inserted the route at the start of 4113 * our DAD process, so we don't need 4114 * to do it again 4115 */ 4116 if (!(ifp->rt->rt6i_node)) 4117 ip6_ins_rt(ifp->rt); 4118 if (ifp->idev->cnf.forwarding) 4119 addrconf_join_anycast(ifp); 4120 break; 4121 case RTM_DELADDR: 4122 if (ifp->idev->cnf.forwarding) 4123 addrconf_leave_anycast(ifp); 4124 addrconf_leave_solict(ifp->idev, &ifp->addr); 4125 dst_hold(&ifp->rt->dst); 4126 4127 if (ifp->state == INET6_IFADDR_STATE_DEAD && 4128 ip6_del_rt(ifp->rt)) 4129 dst_free(&ifp->rt->dst); 4130 break; 4131 } 4132 } 4133 4134 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4135 { 4136 rcu_read_lock_bh(); 4137 if (likely(ifp->idev->dead == 0)) 4138 __ipv6_ifa_notify(event, ifp); 4139 rcu_read_unlock_bh(); 4140 } 4141 4142 #ifdef CONFIG_SYSCTL 4143 4144 static 4145 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4146 void __user *buffer, size_t *lenp, loff_t *ppos) 4147 { 4148 int *valp = ctl->data; 4149 int val = *valp; 4150 loff_t pos = *ppos; 4151 int ret; 4152 4153 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4154 4155 if (write) 4156 ret = addrconf_fixup_forwarding(ctl, valp, val); 4157 if (ret) 4158 *ppos = pos; 4159 return ret; 4160 } 4161 4162 static void dev_disable_change(struct inet6_dev *idev) 4163 { 4164 if (!idev || !idev->dev) 4165 return; 4166 4167 if (idev->cnf.disable_ipv6) 4168 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4169 else 4170 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4171 } 4172 4173 static void addrconf_disable_change(struct net *net, __s32 newf) 4174 { 4175 struct net_device *dev; 4176 struct inet6_dev *idev; 4177 4178 rcu_read_lock(); 4179 for_each_netdev_rcu(net, dev) { 4180 idev = __in6_dev_get(dev); 4181 if (idev) { 4182 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4183 idev->cnf.disable_ipv6 = newf; 4184 if (changed) 4185 dev_disable_change(idev); 4186 } 4187 } 4188 rcu_read_unlock(); 4189 } 4190 4191 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4192 { 4193 struct net *net; 4194 4195 net = (struct net *)table->extra2; 4196 4197 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4198 return 0; 4199 4200 if (!rtnl_trylock()) { 4201 /* Restore the original values before restarting */ 4202 *p = old; 4203 return restart_syscall(); 4204 } 4205 4206 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4207 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4208 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4209 addrconf_disable_change(net, newf); 4210 } else if ((!*p) ^ (!old)) 4211 dev_disable_change((struct inet6_dev *)table->extra1); 4212 4213 rtnl_unlock(); 4214 return 0; 4215 } 4216 4217 static 4218 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4219 void __user *buffer, size_t *lenp, loff_t *ppos) 4220 { 4221 int *valp = ctl->data; 4222 int val = *valp; 4223 loff_t pos = *ppos; 4224 int ret; 4225 4226 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4227 4228 if (write) 4229 ret = addrconf_disable_ipv6(ctl, valp, val); 4230 if (ret) 4231 *ppos = pos; 4232 return ret; 4233 } 4234 4235 static struct addrconf_sysctl_table 4236 { 4237 struct ctl_table_header *sysctl_header; 4238 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4239 char *dev_name; 4240 } addrconf_sysctl __read_mostly = { 4241 .sysctl_header = NULL, 4242 .addrconf_vars = { 4243 { 4244 .procname = "forwarding", 4245 .data = &ipv6_devconf.forwarding, 4246 .maxlen = sizeof(int), 4247 .mode = 0644, 4248 .proc_handler = addrconf_sysctl_forward, 4249 }, 4250 { 4251 .procname = "hop_limit", 4252 .data = &ipv6_devconf.hop_limit, 4253 .maxlen = sizeof(int), 4254 .mode = 0644, 4255 .proc_handler = proc_dointvec, 4256 }, 4257 { 4258 .procname = "mtu", 4259 .data = &ipv6_devconf.mtu6, 4260 .maxlen = sizeof(int), 4261 .mode = 0644, 4262 .proc_handler = proc_dointvec, 4263 }, 4264 { 4265 .procname = "accept_ra", 4266 .data = &ipv6_devconf.accept_ra, 4267 .maxlen = sizeof(int), 4268 .mode = 0644, 4269 .proc_handler = proc_dointvec, 4270 }, 4271 { 4272 .procname = "accept_redirects", 4273 .data = &ipv6_devconf.accept_redirects, 4274 .maxlen = sizeof(int), 4275 .mode = 0644, 4276 .proc_handler = proc_dointvec, 4277 }, 4278 { 4279 .procname = "autoconf", 4280 .data = &ipv6_devconf.autoconf, 4281 .maxlen = sizeof(int), 4282 .mode = 0644, 4283 .proc_handler = proc_dointvec, 4284 }, 4285 { 4286 .procname = "dad_transmits", 4287 .data = &ipv6_devconf.dad_transmits, 4288 .maxlen = sizeof(int), 4289 .mode = 0644, 4290 .proc_handler = proc_dointvec, 4291 }, 4292 { 4293 .procname = "router_solicitations", 4294 .data = &ipv6_devconf.rtr_solicits, 4295 .maxlen = sizeof(int), 4296 .mode = 0644, 4297 .proc_handler = proc_dointvec, 4298 }, 4299 { 4300 .procname = "router_solicitation_interval", 4301 .data = &ipv6_devconf.rtr_solicit_interval, 4302 .maxlen = sizeof(int), 4303 .mode = 0644, 4304 .proc_handler = proc_dointvec_jiffies, 4305 }, 4306 { 4307 .procname = "router_solicitation_delay", 4308 .data = &ipv6_devconf.rtr_solicit_delay, 4309 .maxlen = sizeof(int), 4310 .mode = 0644, 4311 .proc_handler = proc_dointvec_jiffies, 4312 }, 4313 { 4314 .procname = "force_mld_version", 4315 .data = &ipv6_devconf.force_mld_version, 4316 .maxlen = sizeof(int), 4317 .mode = 0644, 4318 .proc_handler = proc_dointvec, 4319 }, 4320 #ifdef CONFIG_IPV6_PRIVACY 4321 { 4322 .procname = "use_tempaddr", 4323 .data = &ipv6_devconf.use_tempaddr, 4324 .maxlen = sizeof(int), 4325 .mode = 0644, 4326 .proc_handler = proc_dointvec, 4327 }, 4328 { 4329 .procname = "temp_valid_lft", 4330 .data = &ipv6_devconf.temp_valid_lft, 4331 .maxlen = sizeof(int), 4332 .mode = 0644, 4333 .proc_handler = proc_dointvec, 4334 }, 4335 { 4336 .procname = "temp_prefered_lft", 4337 .data = &ipv6_devconf.temp_prefered_lft, 4338 .maxlen = sizeof(int), 4339 .mode = 0644, 4340 .proc_handler = proc_dointvec, 4341 }, 4342 { 4343 .procname = "regen_max_retry", 4344 .data = &ipv6_devconf.regen_max_retry, 4345 .maxlen = sizeof(int), 4346 .mode = 0644, 4347 .proc_handler = proc_dointvec, 4348 }, 4349 { 4350 .procname = "max_desync_factor", 4351 .data = &ipv6_devconf.max_desync_factor, 4352 .maxlen = sizeof(int), 4353 .mode = 0644, 4354 .proc_handler = proc_dointvec, 4355 }, 4356 #endif 4357 { 4358 .procname = "max_addresses", 4359 .data = &ipv6_devconf.max_addresses, 4360 .maxlen = sizeof(int), 4361 .mode = 0644, 4362 .proc_handler = proc_dointvec, 4363 }, 4364 { 4365 .procname = "accept_ra_defrtr", 4366 .data = &ipv6_devconf.accept_ra_defrtr, 4367 .maxlen = sizeof(int), 4368 .mode = 0644, 4369 .proc_handler = proc_dointvec, 4370 }, 4371 { 4372 .procname = "accept_ra_pinfo", 4373 .data = &ipv6_devconf.accept_ra_pinfo, 4374 .maxlen = sizeof(int), 4375 .mode = 0644, 4376 .proc_handler = proc_dointvec, 4377 }, 4378 #ifdef CONFIG_IPV6_ROUTER_PREF 4379 { 4380 .procname = "accept_ra_rtr_pref", 4381 .data = &ipv6_devconf.accept_ra_rtr_pref, 4382 .maxlen = sizeof(int), 4383 .mode = 0644, 4384 .proc_handler = proc_dointvec, 4385 }, 4386 { 4387 .procname = "router_probe_interval", 4388 .data = &ipv6_devconf.rtr_probe_interval, 4389 .maxlen = sizeof(int), 4390 .mode = 0644, 4391 .proc_handler = proc_dointvec_jiffies, 4392 }, 4393 #ifdef CONFIG_IPV6_ROUTE_INFO 4394 { 4395 .procname = "accept_ra_rt_info_max_plen", 4396 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4397 .maxlen = sizeof(int), 4398 .mode = 0644, 4399 .proc_handler = proc_dointvec, 4400 }, 4401 #endif 4402 #endif 4403 { 4404 .procname = "proxy_ndp", 4405 .data = &ipv6_devconf.proxy_ndp, 4406 .maxlen = sizeof(int), 4407 .mode = 0644, 4408 .proc_handler = proc_dointvec, 4409 }, 4410 { 4411 .procname = "accept_source_route", 4412 .data = &ipv6_devconf.accept_source_route, 4413 .maxlen = sizeof(int), 4414 .mode = 0644, 4415 .proc_handler = proc_dointvec, 4416 }, 4417 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4418 { 4419 .procname = "optimistic_dad", 4420 .data = &ipv6_devconf.optimistic_dad, 4421 .maxlen = sizeof(int), 4422 .mode = 0644, 4423 .proc_handler = proc_dointvec, 4424 4425 }, 4426 #endif 4427 #ifdef CONFIG_IPV6_MROUTE 4428 { 4429 .procname = "mc_forwarding", 4430 .data = &ipv6_devconf.mc_forwarding, 4431 .maxlen = sizeof(int), 4432 .mode = 0444, 4433 .proc_handler = proc_dointvec, 4434 }, 4435 #endif 4436 { 4437 .procname = "disable_ipv6", 4438 .data = &ipv6_devconf.disable_ipv6, 4439 .maxlen = sizeof(int), 4440 .mode = 0644, 4441 .proc_handler = addrconf_sysctl_disable, 4442 }, 4443 { 4444 .procname = "accept_dad", 4445 .data = &ipv6_devconf.accept_dad, 4446 .maxlen = sizeof(int), 4447 .mode = 0644, 4448 .proc_handler = proc_dointvec, 4449 }, 4450 { 4451 .procname = "force_tllao", 4452 .data = &ipv6_devconf.force_tllao, 4453 .maxlen = sizeof(int), 4454 .mode = 0644, 4455 .proc_handler = proc_dointvec 4456 }, 4457 { 4458 /* sentinel */ 4459 } 4460 }, 4461 }; 4462 4463 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4464 struct inet6_dev *idev, struct ipv6_devconf *p) 4465 { 4466 int i; 4467 struct addrconf_sysctl_table *t; 4468 4469 #define ADDRCONF_CTL_PATH_DEV 3 4470 4471 struct ctl_path addrconf_ctl_path[] = { 4472 { .procname = "net", }, 4473 { .procname = "ipv6", }, 4474 { .procname = "conf", }, 4475 { /* to be set */ }, 4476 { }, 4477 }; 4478 4479 4480 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4481 if (t == NULL) 4482 goto out; 4483 4484 for (i = 0; t->addrconf_vars[i].data; i++) { 4485 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4486 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4487 t->addrconf_vars[i].extra2 = net; 4488 } 4489 4490 /* 4491 * Make a copy of dev_name, because '.procname' is regarded as const 4492 * by sysctl and we wouldn't want anyone to change it under our feet 4493 * (see SIOCSIFNAME). 4494 */ 4495 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4496 if (!t->dev_name) 4497 goto free; 4498 4499 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4500 4501 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4502 t->addrconf_vars); 4503 if (t->sysctl_header == NULL) 4504 goto free_procname; 4505 4506 p->sysctl = t; 4507 return 0; 4508 4509 free_procname: 4510 kfree(t->dev_name); 4511 free: 4512 kfree(t); 4513 out: 4514 return -ENOBUFS; 4515 } 4516 4517 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4518 { 4519 struct addrconf_sysctl_table *t; 4520 4521 if (p->sysctl == NULL) 4522 return; 4523 4524 t = p->sysctl; 4525 p->sysctl = NULL; 4526 unregister_sysctl_table(t->sysctl_header); 4527 kfree(t->dev_name); 4528 kfree(t); 4529 } 4530 4531 static void addrconf_sysctl_register(struct inet6_dev *idev) 4532 { 4533 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4534 &ndisc_ifinfo_sysctl_change); 4535 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4536 idev, &idev->cnf); 4537 } 4538 4539 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4540 { 4541 __addrconf_sysctl_unregister(&idev->cnf); 4542 neigh_sysctl_unregister(idev->nd_parms); 4543 } 4544 4545 4546 #endif 4547 4548 static int __net_init addrconf_init_net(struct net *net) 4549 { 4550 int err; 4551 struct ipv6_devconf *all, *dflt; 4552 4553 err = -ENOMEM; 4554 all = &ipv6_devconf; 4555 dflt = &ipv6_devconf_dflt; 4556 4557 if (!net_eq(net, &init_net)) { 4558 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4559 if (all == NULL) 4560 goto err_alloc_all; 4561 4562 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4563 if (dflt == NULL) 4564 goto err_alloc_dflt; 4565 } else { 4566 /* these will be inherited by all namespaces */ 4567 dflt->autoconf = ipv6_defaults.autoconf; 4568 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4569 } 4570 4571 net->ipv6.devconf_all = all; 4572 net->ipv6.devconf_dflt = dflt; 4573 4574 #ifdef CONFIG_SYSCTL 4575 err = __addrconf_sysctl_register(net, "all", NULL, all); 4576 if (err < 0) 4577 goto err_reg_all; 4578 4579 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4580 if (err < 0) 4581 goto err_reg_dflt; 4582 #endif 4583 return 0; 4584 4585 #ifdef CONFIG_SYSCTL 4586 err_reg_dflt: 4587 __addrconf_sysctl_unregister(all); 4588 err_reg_all: 4589 kfree(dflt); 4590 #endif 4591 err_alloc_dflt: 4592 kfree(all); 4593 err_alloc_all: 4594 return err; 4595 } 4596 4597 static void __net_exit addrconf_exit_net(struct net *net) 4598 { 4599 #ifdef CONFIG_SYSCTL 4600 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4601 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4602 #endif 4603 if (!net_eq(net, &init_net)) { 4604 kfree(net->ipv6.devconf_dflt); 4605 kfree(net->ipv6.devconf_all); 4606 } 4607 } 4608 4609 static struct pernet_operations addrconf_ops = { 4610 .init = addrconf_init_net, 4611 .exit = addrconf_exit_net, 4612 }; 4613 4614 /* 4615 * Device notifier 4616 */ 4617 4618 int register_inet6addr_notifier(struct notifier_block *nb) 4619 { 4620 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4621 } 4622 EXPORT_SYMBOL(register_inet6addr_notifier); 4623 4624 int unregister_inet6addr_notifier(struct notifier_block *nb) 4625 { 4626 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4627 } 4628 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4629 4630 /* 4631 * Init / cleanup code 4632 */ 4633 4634 int __init addrconf_init(void) 4635 { 4636 int i, err; 4637 4638 err = ipv6_addr_label_init(); 4639 if (err < 0) { 4640 printk(KERN_CRIT "IPv6 Addrconf:" 4641 " cannot initialize default policy table: %d.\n", err); 4642 goto out; 4643 } 4644 4645 err = register_pernet_subsys(&addrconf_ops); 4646 if (err < 0) 4647 goto out_addrlabel; 4648 4649 /* The addrconf netdev notifier requires that loopback_dev 4650 * has it's ipv6 private information allocated and setup 4651 * before it can bring up and give link-local addresses 4652 * to other devices which are up. 4653 * 4654 * Unfortunately, loopback_dev is not necessarily the first 4655 * entry in the global dev_base list of net devices. In fact, 4656 * it is likely to be the very last entry on that list. 4657 * So this causes the notifier registry below to try and 4658 * give link-local addresses to all devices besides loopback_dev 4659 * first, then loopback_dev, which cases all the non-loopback_dev 4660 * devices to fail to get a link-local address. 4661 * 4662 * So, as a temporary fix, allocate the ipv6 structure for 4663 * loopback_dev first by hand. 4664 * Longer term, all of the dependencies ipv6 has upon the loopback 4665 * device and it being up should be removed. 4666 */ 4667 rtnl_lock(); 4668 if (!ipv6_add_dev(init_net.loopback_dev)) 4669 err = -ENOMEM; 4670 rtnl_unlock(); 4671 if (err) 4672 goto errlo; 4673 4674 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4675 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4676 4677 register_netdevice_notifier(&ipv6_dev_notf); 4678 4679 addrconf_verify(0); 4680 4681 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4682 if (err < 0) 4683 goto errout; 4684 4685 /* Only the first call to __rtnl_register can fail */ 4686 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4687 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4688 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4689 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4690 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4691 4692 ipv6_addr_label_rtnl_register(); 4693 4694 return 0; 4695 errout: 4696 unregister_netdevice_notifier(&ipv6_dev_notf); 4697 errlo: 4698 unregister_pernet_subsys(&addrconf_ops); 4699 out_addrlabel: 4700 ipv6_addr_label_cleanup(); 4701 out: 4702 return err; 4703 } 4704 4705 void addrconf_cleanup(void) 4706 { 4707 struct net_device *dev; 4708 int i; 4709 4710 unregister_netdevice_notifier(&ipv6_dev_notf); 4711 unregister_pernet_subsys(&addrconf_ops); 4712 ipv6_addr_label_cleanup(); 4713 4714 rtnl_lock(); 4715 4716 /* clean dev list */ 4717 for_each_netdev(&init_net, dev) { 4718 if (__in6_dev_get(dev) == NULL) 4719 continue; 4720 addrconf_ifdown(dev, 1); 4721 } 4722 addrconf_ifdown(init_net.loopback_dev, 2); 4723 4724 /* 4725 * Check hash table. 4726 */ 4727 spin_lock_bh(&addrconf_hash_lock); 4728 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4729 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4730 spin_unlock_bh(&addrconf_hash_lock); 4731 4732 del_timer(&addr_chk_timer); 4733 rtnl_unlock(); 4734 } 4735