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 101 102 static inline u32 cstamp_delta(unsigned long cstamp) 103 { 104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 105 } 106 107 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 108 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 109 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 110 111 #ifdef CONFIG_SYSCTL 112 static void addrconf_sysctl_register(struct inet6_dev *idev); 113 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 114 #else 115 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 116 { 117 } 118 119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 120 { 121 } 122 #endif 123 124 #ifdef CONFIG_IPV6_PRIVACY 125 static int __ipv6_regen_rndid(struct inet6_dev *idev); 126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 127 static void ipv6_regen_rndid(unsigned long data); 128 #endif 129 130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 131 static int ipv6_count_addresses(struct inet6_dev *idev); 132 133 /* 134 * Configured unicast address hash table 135 */ 136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 137 static DEFINE_SPINLOCK(addrconf_hash_lock); 138 139 static void addrconf_verify(unsigned long); 140 141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 142 static DEFINE_SPINLOCK(addrconf_verify_lock); 143 144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 146 147 static void addrconf_type_change(struct net_device *dev, 148 unsigned long event); 149 static int addrconf_ifdown(struct net_device *dev, int how); 150 151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 152 static void addrconf_dad_timer(unsigned long data); 153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 154 static void addrconf_dad_run(struct inet6_dev *idev); 155 static void addrconf_rs_timer(unsigned long data); 156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 158 159 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 160 struct prefix_info *pinfo); 161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 162 struct net_device *dev); 163 164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 165 166 static struct ipv6_devconf ipv6_devconf __read_mostly = { 167 .forwarding = 0, 168 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 169 .mtu6 = IPV6_MIN_MTU, 170 .accept_ra = 1, 171 .accept_redirects = 1, 172 .autoconf = 1, 173 .force_mld_version = 0, 174 .dad_transmits = 1, 175 .rtr_solicits = MAX_RTR_SOLICITATIONS, 176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 178 #ifdef CONFIG_IPV6_PRIVACY 179 .use_tempaddr = 0, 180 .temp_valid_lft = TEMP_VALID_LIFETIME, 181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 182 .regen_max_retry = REGEN_MAX_RETRY, 183 .max_desync_factor = MAX_DESYNC_FACTOR, 184 #endif 185 .max_addresses = IPV6_MAX_ADDRESSES, 186 .accept_ra_defrtr = 1, 187 .accept_ra_pinfo = 1, 188 #ifdef CONFIG_IPV6_ROUTER_PREF 189 .accept_ra_rtr_pref = 1, 190 .rtr_probe_interval = 60 * HZ, 191 #ifdef CONFIG_IPV6_ROUTE_INFO 192 .accept_ra_rt_info_max_plen = 0, 193 #endif 194 #endif 195 .proxy_ndp = 0, 196 .accept_source_route = 0, /* we do not accept RH0 by default. */ 197 .disable_ipv6 = 0, 198 .accept_dad = 1, 199 }; 200 201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 202 .forwarding = 0, 203 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 204 .mtu6 = IPV6_MIN_MTU, 205 .accept_ra = 1, 206 .accept_redirects = 1, 207 .autoconf = 1, 208 .dad_transmits = 1, 209 .rtr_solicits = MAX_RTR_SOLICITATIONS, 210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 212 #ifdef CONFIG_IPV6_PRIVACY 213 .use_tempaddr = 0, 214 .temp_valid_lft = TEMP_VALID_LIFETIME, 215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 216 .regen_max_retry = REGEN_MAX_RETRY, 217 .max_desync_factor = MAX_DESYNC_FACTOR, 218 #endif 219 .max_addresses = IPV6_MAX_ADDRESSES, 220 .accept_ra_defrtr = 1, 221 .accept_ra_pinfo = 1, 222 #ifdef CONFIG_IPV6_ROUTER_PREF 223 .accept_ra_rtr_pref = 1, 224 .rtr_probe_interval = 60 * HZ, 225 #ifdef CONFIG_IPV6_ROUTE_INFO 226 .accept_ra_rt_info_max_plen = 0, 227 #endif 228 #endif 229 .proxy_ndp = 0, 230 .accept_source_route = 0, /* we do not accept RH0 by default. */ 231 .disable_ipv6 = 0, 232 .accept_dad = 1, 233 }; 234 235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 240 241 /* Check if a valid qdisc is available */ 242 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 243 { 244 return !qdisc_tx_is_noop(dev); 245 } 246 247 /* Check if a route is valid prefix route */ 248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 249 { 250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 251 } 252 253 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 254 { 255 if (del_timer(&ifp->timer)) 256 __in6_ifa_put(ifp); 257 } 258 259 enum addrconf_timer_t { 260 AC_NONE, 261 AC_DAD, 262 AC_RS, 263 }; 264 265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 266 enum addrconf_timer_t what, 267 unsigned long when) 268 { 269 if (!del_timer(&ifp->timer)) 270 in6_ifa_hold(ifp); 271 272 switch (what) { 273 case AC_DAD: 274 ifp->timer.function = addrconf_dad_timer; 275 break; 276 case AC_RS: 277 ifp->timer.function = addrconf_rs_timer; 278 break; 279 default: 280 break; 281 } 282 ifp->timer.expires = jiffies + when; 283 add_timer(&ifp->timer); 284 } 285 286 static int snmp6_alloc_dev(struct inet6_dev *idev) 287 { 288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 289 sizeof(struct ipstats_mib), 290 __alignof__(struct ipstats_mib)) < 0) 291 goto err_ip; 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6, 293 sizeof(struct icmpv6_mib), 294 __alignof__(struct icmpv6_mib)) < 0) 295 goto err_icmp; 296 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg, 297 sizeof(struct icmpv6msg_mib), 298 __alignof__(struct icmpv6msg_mib)) < 0) 299 goto err_icmpmsg; 300 301 return 0; 302 303 err_icmpmsg: 304 snmp_mib_free((void __percpu **)idev->stats.icmpv6); 305 err_icmp: 306 snmp_mib_free((void __percpu **)idev->stats.ipv6); 307 err_ip: 308 return -ENOMEM; 309 } 310 311 static void snmp6_free_dev(struct inet6_dev *idev) 312 { 313 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg); 314 snmp_mib_free((void __percpu **)idev->stats.icmpv6); 315 snmp_mib_free((void __percpu **)idev->stats.ipv6); 316 } 317 318 /* Nobody refers to this device, we may destroy it. */ 319 320 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 321 { 322 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 323 kfree(idev); 324 } 325 326 void in6_dev_finish_destroy(struct inet6_dev *idev) 327 { 328 struct net_device *dev = idev->dev; 329 330 WARN_ON(!list_empty(&idev->addr_list)); 331 WARN_ON(idev->mc_list != NULL); 332 333 #ifdef NET_REFCNT_DEBUG 334 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 335 #endif 336 dev_put(dev); 337 if (!idev->dead) { 338 pr_warning("Freeing alive inet6 device %p\n", idev); 339 return; 340 } 341 snmp6_free_dev(idev); 342 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 343 } 344 345 EXPORT_SYMBOL(in6_dev_finish_destroy); 346 347 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 348 { 349 struct inet6_dev *ndev; 350 351 ASSERT_RTNL(); 352 353 if (dev->mtu < IPV6_MIN_MTU) 354 return NULL; 355 356 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 357 358 if (ndev == NULL) 359 return NULL; 360 361 rwlock_init(&ndev->lock); 362 ndev->dev = dev; 363 INIT_LIST_HEAD(&ndev->addr_list); 364 365 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 366 ndev->cnf.mtu6 = dev->mtu; 367 ndev->cnf.sysctl = NULL; 368 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 369 if (ndev->nd_parms == NULL) { 370 kfree(ndev); 371 return NULL; 372 } 373 if (ndev->cnf.forwarding) 374 dev_disable_lro(dev); 375 /* We refer to the device */ 376 dev_hold(dev); 377 378 if (snmp6_alloc_dev(ndev) < 0) { 379 ADBG((KERN_WARNING 380 "%s(): cannot allocate memory for statistics; dev=%s.\n", 381 __func__, dev->name)); 382 neigh_parms_release(&nd_tbl, ndev->nd_parms); 383 ndev->dead = 1; 384 in6_dev_finish_destroy(ndev); 385 return NULL; 386 } 387 388 if (snmp6_register_dev(ndev) < 0) { 389 ADBG((KERN_WARNING 390 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 391 __func__, dev->name)); 392 neigh_parms_release(&nd_tbl, ndev->nd_parms); 393 ndev->dead = 1; 394 in6_dev_finish_destroy(ndev); 395 return NULL; 396 } 397 398 /* One reference from device. We must do this before 399 * we invoke __ipv6_regen_rndid(). 400 */ 401 in6_dev_hold(ndev); 402 403 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 404 ndev->cnf.accept_dad = -1; 405 406 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 407 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 408 printk(KERN_INFO 409 "%s: Disabled Multicast RS\n", 410 dev->name); 411 ndev->cnf.rtr_solicits = 0; 412 } 413 #endif 414 415 #ifdef CONFIG_IPV6_PRIVACY 416 INIT_LIST_HEAD(&ndev->tempaddr_list); 417 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 418 if ((dev->flags&IFF_LOOPBACK) || 419 dev->type == ARPHRD_TUNNEL || 420 dev->type == ARPHRD_TUNNEL6 || 421 dev->type == ARPHRD_SIT || 422 dev->type == ARPHRD_NONE) { 423 printk(KERN_INFO 424 "%s: Disabled Privacy Extensions\n", 425 dev->name); 426 ndev->cnf.use_tempaddr = -1; 427 } else { 428 in6_dev_hold(ndev); 429 ipv6_regen_rndid((unsigned long) ndev); 430 } 431 #endif 432 433 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 434 ndev->if_flags |= IF_READY; 435 436 ipv6_mc_init_dev(ndev); 437 ndev->tstamp = jiffies; 438 addrconf_sysctl_register(ndev); 439 /* protected by rtnl_lock */ 440 rcu_assign_pointer(dev->ip6_ptr, ndev); 441 442 /* Join all-node multicast group */ 443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 444 445 return ndev; 446 } 447 448 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 449 { 450 struct inet6_dev *idev; 451 452 ASSERT_RTNL(); 453 454 idev = __in6_dev_get(dev); 455 if (!idev) { 456 idev = ipv6_add_dev(dev); 457 if (!idev) 458 return NULL; 459 } 460 461 if (dev->flags&IFF_UP) 462 ipv6_mc_up(idev); 463 return idev; 464 } 465 466 #ifdef CONFIG_SYSCTL 467 static void dev_forward_change(struct inet6_dev *idev) 468 { 469 struct net_device *dev; 470 struct inet6_ifaddr *ifa; 471 472 if (!idev) 473 return; 474 dev = idev->dev; 475 if (idev->cnf.forwarding) 476 dev_disable_lro(dev); 477 if (dev && (dev->flags & IFF_MULTICAST)) { 478 if (idev->cnf.forwarding) 479 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 480 else 481 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 482 } 483 484 list_for_each_entry(ifa, &idev->addr_list, if_list) { 485 if (ifa->flags&IFA_F_TENTATIVE) 486 continue; 487 if (idev->cnf.forwarding) 488 addrconf_join_anycast(ifa); 489 else 490 addrconf_leave_anycast(ifa); 491 } 492 } 493 494 495 static void addrconf_forward_change(struct net *net, __s32 newf) 496 { 497 struct net_device *dev; 498 struct inet6_dev *idev; 499 500 rcu_read_lock(); 501 for_each_netdev_rcu(net, dev) { 502 idev = __in6_dev_get(dev); 503 if (idev) { 504 int changed = (!idev->cnf.forwarding) ^ (!newf); 505 idev->cnf.forwarding = newf; 506 if (changed) 507 dev_forward_change(idev); 508 } 509 } 510 rcu_read_unlock(); 511 } 512 513 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 514 { 515 struct net *net; 516 517 net = (struct net *)table->extra2; 518 if (p == &net->ipv6.devconf_dflt->forwarding) 519 return 0; 520 521 if (!rtnl_trylock()) { 522 /* Restore the original values before restarting */ 523 *p = old; 524 return restart_syscall(); 525 } 526 527 if (p == &net->ipv6.devconf_all->forwarding) { 528 __s32 newf = net->ipv6.devconf_all->forwarding; 529 net->ipv6.devconf_dflt->forwarding = newf; 530 addrconf_forward_change(net, newf); 531 } else if ((!*p) ^ (!old)) 532 dev_forward_change((struct inet6_dev *)table->extra1); 533 rtnl_unlock(); 534 535 if (*p) 536 rt6_purge_dflt_routers(net); 537 return 1; 538 } 539 #endif 540 541 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head) 542 { 543 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu); 544 kfree(ifp); 545 } 546 547 /* Nobody refers to this ifaddr, destroy it */ 548 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 549 { 550 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 551 552 #ifdef NET_REFCNT_DEBUG 553 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 554 #endif 555 556 in6_dev_put(ifp->idev); 557 558 if (del_timer(&ifp->timer)) 559 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 560 561 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 562 pr_warning("Freeing alive inet6 address %p\n", ifp); 563 return; 564 } 565 dst_release(&ifp->rt->dst); 566 567 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu); 568 } 569 570 static void 571 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 572 { 573 struct list_head *p; 574 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 575 576 /* 577 * Each device address list is sorted in order of scope - 578 * global before linklocal. 579 */ 580 list_for_each(p, &idev->addr_list) { 581 struct inet6_ifaddr *ifa 582 = list_entry(p, struct inet6_ifaddr, if_list); 583 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 584 break; 585 } 586 587 list_add_tail(&ifp->if_list, p); 588 } 589 590 static u32 ipv6_addr_hash(const struct in6_addr *addr) 591 { 592 /* 593 * We perform the hash function over the last 64 bits of the address 594 * This will include the IEEE address token on links that support it. 595 */ 596 return jhash_2words((__force u32)addr->s6_addr32[2], 597 (__force u32)addr->s6_addr32[3], 0) 598 & (IN6_ADDR_HSIZE - 1); 599 } 600 601 /* On success it returns ifp with increased reference count */ 602 603 static struct inet6_ifaddr * 604 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 605 int scope, u32 flags) 606 { 607 struct inet6_ifaddr *ifa = NULL; 608 struct rt6_info *rt; 609 unsigned int hash; 610 int err = 0; 611 int addr_type = ipv6_addr_type(addr); 612 613 if (addr_type == IPV6_ADDR_ANY || 614 addr_type & IPV6_ADDR_MULTICAST || 615 (!(idev->dev->flags & IFF_LOOPBACK) && 616 addr_type & IPV6_ADDR_LOOPBACK)) 617 return ERR_PTR(-EADDRNOTAVAIL); 618 619 rcu_read_lock_bh(); 620 if (idev->dead) { 621 err = -ENODEV; /*XXX*/ 622 goto out2; 623 } 624 625 if (idev->cnf.disable_ipv6) { 626 err = -EACCES; 627 goto out2; 628 } 629 630 spin_lock(&addrconf_hash_lock); 631 632 /* Ignore adding duplicate addresses on an interface */ 633 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 634 ADBG(("ipv6_add_addr: already assigned\n")); 635 err = -EEXIST; 636 goto out; 637 } 638 639 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 640 641 if (ifa == NULL) { 642 ADBG(("ipv6_add_addr: malloc failed\n")); 643 err = -ENOBUFS; 644 goto out; 645 } 646 647 rt = addrconf_dst_alloc(idev, addr, 0); 648 if (IS_ERR(rt)) { 649 err = PTR_ERR(rt); 650 goto out; 651 } 652 653 ipv6_addr_copy(&ifa->addr, addr); 654 655 spin_lock_init(&ifa->lock); 656 spin_lock_init(&ifa->state_lock); 657 init_timer(&ifa->timer); 658 INIT_HLIST_NODE(&ifa->addr_lst); 659 ifa->timer.data = (unsigned long) ifa; 660 ifa->scope = scope; 661 ifa->prefix_len = pfxlen; 662 ifa->flags = flags | IFA_F_TENTATIVE; 663 ifa->cstamp = ifa->tstamp = jiffies; 664 665 ifa->rt = rt; 666 667 /* 668 * part one of RFC 4429, section 3.3 669 * We should not configure an address as 670 * optimistic if we do not yet know the link 671 * layer address of our nexhop router 672 */ 673 674 if (rt->rt6i_nexthop == NULL) 675 ifa->flags &= ~IFA_F_OPTIMISTIC; 676 677 ifa->idev = idev; 678 in6_dev_hold(idev); 679 /* For caller */ 680 in6_ifa_hold(ifa); 681 682 /* Add to big hash table */ 683 hash = ipv6_addr_hash(addr); 684 685 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 686 spin_unlock(&addrconf_hash_lock); 687 688 write_lock(&idev->lock); 689 /* Add to inet6_dev unicast addr list. */ 690 ipv6_link_dev_addr(idev, ifa); 691 692 #ifdef CONFIG_IPV6_PRIVACY 693 if (ifa->flags&IFA_F_TEMPORARY) { 694 list_add(&ifa->tmp_list, &idev->tempaddr_list); 695 in6_ifa_hold(ifa); 696 } 697 #endif 698 699 in6_ifa_hold(ifa); 700 write_unlock(&idev->lock); 701 out2: 702 rcu_read_unlock_bh(); 703 704 if (likely(err == 0)) 705 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 706 else { 707 kfree(ifa); 708 ifa = ERR_PTR(err); 709 } 710 711 return ifa; 712 out: 713 spin_unlock(&addrconf_hash_lock); 714 goto out2; 715 } 716 717 /* This function wants to get referenced ifp and releases it before return */ 718 719 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 720 { 721 struct inet6_ifaddr *ifa, *ifn; 722 struct inet6_dev *idev = ifp->idev; 723 int state; 724 int hash; 725 int deleted = 0, onlink = 0; 726 unsigned long expires = jiffies; 727 728 hash = ipv6_addr_hash(&ifp->addr); 729 730 spin_lock_bh(&ifp->state_lock); 731 state = ifp->state; 732 ifp->state = INET6_IFADDR_STATE_DEAD; 733 spin_unlock_bh(&ifp->state_lock); 734 735 if (state == INET6_IFADDR_STATE_DEAD) 736 goto out; 737 738 spin_lock_bh(&addrconf_hash_lock); 739 hlist_del_init_rcu(&ifp->addr_lst); 740 spin_unlock_bh(&addrconf_hash_lock); 741 742 write_lock_bh(&idev->lock); 743 #ifdef CONFIG_IPV6_PRIVACY 744 if (ifp->flags&IFA_F_TEMPORARY) { 745 list_del(&ifp->tmp_list); 746 if (ifp->ifpub) { 747 in6_ifa_put(ifp->ifpub); 748 ifp->ifpub = NULL; 749 } 750 __in6_ifa_put(ifp); 751 } 752 #endif 753 754 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 755 if (ifa == ifp) { 756 list_del_init(&ifp->if_list); 757 __in6_ifa_put(ifp); 758 759 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 760 break; 761 deleted = 1; 762 continue; 763 } else if (ifp->flags & IFA_F_PERMANENT) { 764 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 765 ifp->prefix_len)) { 766 if (ifa->flags & IFA_F_PERMANENT) { 767 onlink = 1; 768 if (deleted) 769 break; 770 } else { 771 unsigned long lifetime; 772 773 if (!onlink) 774 onlink = -1; 775 776 spin_lock(&ifa->lock); 777 778 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 779 /* 780 * Note: Because this address is 781 * not permanent, lifetime < 782 * LONG_MAX / HZ here. 783 */ 784 if (time_before(expires, 785 ifa->tstamp + lifetime * HZ)) 786 expires = ifa->tstamp + lifetime * HZ; 787 spin_unlock(&ifa->lock); 788 } 789 } 790 } 791 } 792 write_unlock_bh(&idev->lock); 793 794 addrconf_del_timer(ifp); 795 796 ipv6_ifa_notify(RTM_DELADDR, ifp); 797 798 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 799 800 /* 801 * Purge or update corresponding prefix 802 * 803 * 1) we don't purge prefix here if address was not permanent. 804 * prefix is managed by its own lifetime. 805 * 2) if there're no addresses, delete prefix. 806 * 3) if there're still other permanent address(es), 807 * corresponding prefix is still permanent. 808 * 4) otherwise, update prefix lifetime to the 809 * longest valid lifetime among the corresponding 810 * addresses on the device. 811 * Note: subsequent RA will update lifetime. 812 * 813 * --yoshfuji 814 */ 815 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 816 struct in6_addr prefix; 817 struct rt6_info *rt; 818 struct net *net = dev_net(ifp->idev->dev); 819 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 820 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 821 822 if (rt && addrconf_is_prefix_route(rt)) { 823 if (onlink == 0) { 824 ip6_del_rt(rt); 825 rt = NULL; 826 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 827 rt->rt6i_expires = expires; 828 rt->rt6i_flags |= RTF_EXPIRES; 829 } 830 } 831 dst_release(&rt->dst); 832 } 833 834 out: 835 in6_ifa_put(ifp); 836 } 837 838 #ifdef CONFIG_IPV6_PRIVACY 839 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 840 { 841 struct inet6_dev *idev = ifp->idev; 842 struct in6_addr addr, *tmpaddr; 843 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age; 844 unsigned long regen_advance; 845 int tmp_plen; 846 int ret = 0; 847 int max_addresses; 848 u32 addr_flags; 849 850 write_lock(&idev->lock); 851 if (ift) { 852 spin_lock_bh(&ift->lock); 853 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 854 spin_unlock_bh(&ift->lock); 855 tmpaddr = &addr; 856 } else { 857 tmpaddr = NULL; 858 } 859 retry: 860 in6_dev_hold(idev); 861 if (idev->cnf.use_tempaddr <= 0) { 862 write_unlock(&idev->lock); 863 printk(KERN_INFO 864 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 865 in6_dev_put(idev); 866 ret = -1; 867 goto out; 868 } 869 spin_lock_bh(&ifp->lock); 870 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 871 idev->cnf.use_tempaddr = -1; /*XXX*/ 872 spin_unlock_bh(&ifp->lock); 873 write_unlock(&idev->lock); 874 printk(KERN_WARNING 875 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 876 in6_dev_put(idev); 877 ret = -1; 878 goto out; 879 } 880 in6_ifa_hold(ifp); 881 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 882 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 883 spin_unlock_bh(&ifp->lock); 884 write_unlock(&idev->lock); 885 printk(KERN_WARNING 886 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 887 in6_ifa_put(ifp); 888 in6_dev_put(idev); 889 ret = -1; 890 goto out; 891 } 892 memcpy(&addr.s6_addr[8], idev->rndid, 8); 893 age = (jiffies - ifp->tstamp) / HZ; 894 tmp_valid_lft = min_t(__u32, 895 ifp->valid_lft, 896 idev->cnf.temp_valid_lft + age); 897 tmp_prefered_lft = min_t(__u32, 898 ifp->prefered_lft, 899 idev->cnf.temp_prefered_lft + age - 900 idev->cnf.max_desync_factor); 901 tmp_plen = ifp->prefix_len; 902 max_addresses = idev->cnf.max_addresses; 903 tmp_cstamp = ifp->cstamp; 904 tmp_tstamp = ifp->tstamp; 905 spin_unlock_bh(&ifp->lock); 906 907 regen_advance = idev->cnf.regen_max_retry * 908 idev->cnf.dad_transmits * 909 idev->nd_parms->retrans_time / HZ; 910 write_unlock(&idev->lock); 911 912 /* A temporary address is created only if this calculated Preferred 913 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 914 * an implementation must not create a temporary address with a zero 915 * Preferred Lifetime. 916 */ 917 if (tmp_prefered_lft <= regen_advance) { 918 in6_ifa_put(ifp); 919 in6_dev_put(idev); 920 ret = -1; 921 goto out; 922 } 923 924 addr_flags = IFA_F_TEMPORARY; 925 /* set in addrconf_prefix_rcv() */ 926 if (ifp->flags & IFA_F_OPTIMISTIC) 927 addr_flags |= IFA_F_OPTIMISTIC; 928 929 ift = !max_addresses || 930 ipv6_count_addresses(idev) < max_addresses ? 931 ipv6_add_addr(idev, &addr, tmp_plen, 932 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 933 addr_flags) : NULL; 934 if (!ift || IS_ERR(ift)) { 935 in6_ifa_put(ifp); 936 in6_dev_put(idev); 937 printk(KERN_INFO 938 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 939 tmpaddr = &addr; 940 write_lock(&idev->lock); 941 goto retry; 942 } 943 944 spin_lock_bh(&ift->lock); 945 ift->ifpub = ifp; 946 ift->valid_lft = tmp_valid_lft; 947 ift->prefered_lft = tmp_prefered_lft; 948 ift->cstamp = tmp_cstamp; 949 ift->tstamp = tmp_tstamp; 950 spin_unlock_bh(&ift->lock); 951 952 addrconf_dad_start(ift, 0); 953 in6_ifa_put(ift); 954 in6_dev_put(idev); 955 out: 956 return ret; 957 } 958 #endif 959 960 /* 961 * Choose an appropriate source address (RFC3484) 962 */ 963 enum { 964 IPV6_SADDR_RULE_INIT = 0, 965 IPV6_SADDR_RULE_LOCAL, 966 IPV6_SADDR_RULE_SCOPE, 967 IPV6_SADDR_RULE_PREFERRED, 968 #ifdef CONFIG_IPV6_MIP6 969 IPV6_SADDR_RULE_HOA, 970 #endif 971 IPV6_SADDR_RULE_OIF, 972 IPV6_SADDR_RULE_LABEL, 973 #ifdef CONFIG_IPV6_PRIVACY 974 IPV6_SADDR_RULE_PRIVACY, 975 #endif 976 IPV6_SADDR_RULE_ORCHID, 977 IPV6_SADDR_RULE_PREFIX, 978 IPV6_SADDR_RULE_MAX 979 }; 980 981 struct ipv6_saddr_score { 982 int rule; 983 int addr_type; 984 struct inet6_ifaddr *ifa; 985 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 986 int scopedist; 987 int matchlen; 988 }; 989 990 struct ipv6_saddr_dst { 991 const struct in6_addr *addr; 992 int ifindex; 993 int scope; 994 int label; 995 unsigned int prefs; 996 }; 997 998 static inline int ipv6_saddr_preferred(int type) 999 { 1000 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1001 return 1; 1002 return 0; 1003 } 1004 1005 static int ipv6_get_saddr_eval(struct net *net, 1006 struct ipv6_saddr_score *score, 1007 struct ipv6_saddr_dst *dst, 1008 int i) 1009 { 1010 int ret; 1011 1012 if (i <= score->rule) { 1013 switch (i) { 1014 case IPV6_SADDR_RULE_SCOPE: 1015 ret = score->scopedist; 1016 break; 1017 case IPV6_SADDR_RULE_PREFIX: 1018 ret = score->matchlen; 1019 break; 1020 default: 1021 ret = !!test_bit(i, score->scorebits); 1022 } 1023 goto out; 1024 } 1025 1026 switch (i) { 1027 case IPV6_SADDR_RULE_INIT: 1028 /* Rule 0: remember if hiscore is not ready yet */ 1029 ret = !!score->ifa; 1030 break; 1031 case IPV6_SADDR_RULE_LOCAL: 1032 /* Rule 1: Prefer same address */ 1033 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1034 break; 1035 case IPV6_SADDR_RULE_SCOPE: 1036 /* Rule 2: Prefer appropriate scope 1037 * 1038 * ret 1039 * ^ 1040 * -1 | d 15 1041 * ---+--+-+---> scope 1042 * | 1043 * | d is scope of the destination. 1044 * B-d | \ 1045 * | \ <- smaller scope is better if 1046 * B-15 | \ if scope is enough for destinaion. 1047 * | ret = B - scope (-1 <= scope >= d <= 15). 1048 * d-C-1 | / 1049 * |/ <- greater is better 1050 * -C / if scope is not enough for destination. 1051 * /| ret = scope - C (-1 <= d < scope <= 15). 1052 * 1053 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1054 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1055 * Assume B = 0 and we get C > 29. 1056 */ 1057 ret = __ipv6_addr_src_scope(score->addr_type); 1058 if (ret >= dst->scope) 1059 ret = -ret; 1060 else 1061 ret -= 128; /* 30 is enough */ 1062 score->scopedist = ret; 1063 break; 1064 case IPV6_SADDR_RULE_PREFERRED: 1065 /* Rule 3: Avoid deprecated and optimistic addresses */ 1066 ret = ipv6_saddr_preferred(score->addr_type) || 1067 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1068 break; 1069 #ifdef CONFIG_IPV6_MIP6 1070 case IPV6_SADDR_RULE_HOA: 1071 { 1072 /* Rule 4: Prefer home address */ 1073 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1074 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1075 break; 1076 } 1077 #endif 1078 case IPV6_SADDR_RULE_OIF: 1079 /* Rule 5: Prefer outgoing interface */ 1080 ret = (!dst->ifindex || 1081 dst->ifindex == score->ifa->idev->dev->ifindex); 1082 break; 1083 case IPV6_SADDR_RULE_LABEL: 1084 /* Rule 6: Prefer matching label */ 1085 ret = ipv6_addr_label(net, 1086 &score->ifa->addr, score->addr_type, 1087 score->ifa->idev->dev->ifindex) == dst->label; 1088 break; 1089 #ifdef CONFIG_IPV6_PRIVACY 1090 case IPV6_SADDR_RULE_PRIVACY: 1091 { 1092 /* Rule 7: Prefer public address 1093 * Note: prefer temprary address if use_tempaddr >= 2 1094 */ 1095 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1096 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1097 score->ifa->idev->cnf.use_tempaddr >= 2; 1098 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1099 break; 1100 } 1101 #endif 1102 case IPV6_SADDR_RULE_ORCHID: 1103 /* Rule 8-: Prefer ORCHID vs ORCHID or 1104 * non-ORCHID vs non-ORCHID 1105 */ 1106 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1107 ipv6_addr_orchid(dst->addr)); 1108 break; 1109 case IPV6_SADDR_RULE_PREFIX: 1110 /* Rule 8: Use longest matching prefix */ 1111 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1112 dst->addr); 1113 break; 1114 default: 1115 ret = 0; 1116 } 1117 1118 if (ret) 1119 __set_bit(i, score->scorebits); 1120 score->rule = i; 1121 out: 1122 return ret; 1123 } 1124 1125 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1126 const struct in6_addr *daddr, unsigned int prefs, 1127 struct in6_addr *saddr) 1128 { 1129 struct ipv6_saddr_score scores[2], 1130 *score = &scores[0], *hiscore = &scores[1]; 1131 struct ipv6_saddr_dst dst; 1132 struct net_device *dev; 1133 int dst_type; 1134 1135 dst_type = __ipv6_addr_type(daddr); 1136 dst.addr = daddr; 1137 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1138 dst.scope = __ipv6_addr_src_scope(dst_type); 1139 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1140 dst.prefs = prefs; 1141 1142 hiscore->rule = -1; 1143 hiscore->ifa = NULL; 1144 1145 rcu_read_lock(); 1146 1147 for_each_netdev_rcu(net, dev) { 1148 struct inet6_dev *idev; 1149 1150 /* Candidate Source Address (section 4) 1151 * - multicast and link-local destination address, 1152 * the set of candidate source address MUST only 1153 * include addresses assigned to interfaces 1154 * belonging to the same link as the outgoing 1155 * interface. 1156 * (- For site-local destination addresses, the 1157 * set of candidate source addresses MUST only 1158 * include addresses assigned to interfaces 1159 * belonging to the same site as the outgoing 1160 * interface.) 1161 */ 1162 if (((dst_type & IPV6_ADDR_MULTICAST) || 1163 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1164 dst.ifindex && dev->ifindex != dst.ifindex) 1165 continue; 1166 1167 idev = __in6_dev_get(dev); 1168 if (!idev) 1169 continue; 1170 1171 read_lock_bh(&idev->lock); 1172 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1173 int i; 1174 1175 /* 1176 * - Tentative Address (RFC2462 section 5.4) 1177 * - A tentative address is not considered 1178 * "assigned to an interface" in the traditional 1179 * sense, unless it is also flagged as optimistic. 1180 * - Candidate Source Address (section 4) 1181 * - In any case, anycast addresses, multicast 1182 * addresses, and the unspecified address MUST 1183 * NOT be included in a candidate set. 1184 */ 1185 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1186 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1187 continue; 1188 1189 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1190 1191 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1192 score->addr_type & IPV6_ADDR_MULTICAST)) { 1193 LIMIT_NETDEBUG(KERN_DEBUG 1194 "ADDRCONF: unspecified / multicast address " 1195 "assigned as unicast address on %s", 1196 dev->name); 1197 continue; 1198 } 1199 1200 score->rule = -1; 1201 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1202 1203 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1204 int minihiscore, miniscore; 1205 1206 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1207 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1208 1209 if (minihiscore > miniscore) { 1210 if (i == IPV6_SADDR_RULE_SCOPE && 1211 score->scopedist > 0) { 1212 /* 1213 * special case: 1214 * each remaining entry 1215 * has too small (not enough) 1216 * scope, because ifa entries 1217 * are sorted by their scope 1218 * values. 1219 */ 1220 goto try_nextdev; 1221 } 1222 break; 1223 } else if (minihiscore < miniscore) { 1224 if (hiscore->ifa) 1225 in6_ifa_put(hiscore->ifa); 1226 1227 in6_ifa_hold(score->ifa); 1228 1229 swap(hiscore, score); 1230 1231 /* restore our iterator */ 1232 score->ifa = hiscore->ifa; 1233 1234 break; 1235 } 1236 } 1237 } 1238 try_nextdev: 1239 read_unlock_bh(&idev->lock); 1240 } 1241 rcu_read_unlock(); 1242 1243 if (!hiscore->ifa) 1244 return -EADDRNOTAVAIL; 1245 1246 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1247 in6_ifa_put(hiscore->ifa); 1248 return 0; 1249 } 1250 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1251 1252 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1253 unsigned char banned_flags) 1254 { 1255 struct inet6_dev *idev; 1256 int err = -EADDRNOTAVAIL; 1257 1258 rcu_read_lock(); 1259 idev = __in6_dev_get(dev); 1260 if (idev) { 1261 struct inet6_ifaddr *ifp; 1262 1263 read_lock_bh(&idev->lock); 1264 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1265 if (ifp->scope == IFA_LINK && 1266 !(ifp->flags & banned_flags)) { 1267 ipv6_addr_copy(addr, &ifp->addr); 1268 err = 0; 1269 break; 1270 } 1271 } 1272 read_unlock_bh(&idev->lock); 1273 } 1274 rcu_read_unlock(); 1275 return err; 1276 } 1277 1278 static int ipv6_count_addresses(struct inet6_dev *idev) 1279 { 1280 int cnt = 0; 1281 struct inet6_ifaddr *ifp; 1282 1283 read_lock_bh(&idev->lock); 1284 list_for_each_entry(ifp, &idev->addr_list, if_list) 1285 cnt++; 1286 read_unlock_bh(&idev->lock); 1287 return cnt; 1288 } 1289 1290 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1291 struct net_device *dev, int strict) 1292 { 1293 struct inet6_ifaddr *ifp; 1294 struct hlist_node *node; 1295 unsigned int hash = ipv6_addr_hash(addr); 1296 1297 rcu_read_lock_bh(); 1298 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1299 if (!net_eq(dev_net(ifp->idev->dev), net)) 1300 continue; 1301 if (ipv6_addr_equal(&ifp->addr, addr) && 1302 !(ifp->flags&IFA_F_TENTATIVE) && 1303 (dev == NULL || ifp->idev->dev == dev || 1304 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1305 rcu_read_unlock_bh(); 1306 return 1; 1307 } 1308 } 1309 1310 rcu_read_unlock_bh(); 1311 return 0; 1312 } 1313 EXPORT_SYMBOL(ipv6_chk_addr); 1314 1315 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1316 struct net_device *dev) 1317 { 1318 unsigned int hash = ipv6_addr_hash(addr); 1319 struct inet6_ifaddr *ifp; 1320 struct hlist_node *node; 1321 1322 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1323 if (!net_eq(dev_net(ifp->idev->dev), net)) 1324 continue; 1325 if (ipv6_addr_equal(&ifp->addr, addr)) { 1326 if (dev == NULL || ifp->idev->dev == dev) 1327 return true; 1328 } 1329 } 1330 return false; 1331 } 1332 1333 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1334 { 1335 struct inet6_dev *idev; 1336 struct inet6_ifaddr *ifa; 1337 int onlink; 1338 1339 onlink = 0; 1340 rcu_read_lock(); 1341 idev = __in6_dev_get(dev); 1342 if (idev) { 1343 read_lock_bh(&idev->lock); 1344 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1345 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1346 ifa->prefix_len); 1347 if (onlink) 1348 break; 1349 } 1350 read_unlock_bh(&idev->lock); 1351 } 1352 rcu_read_unlock(); 1353 return onlink; 1354 } 1355 1356 EXPORT_SYMBOL(ipv6_chk_prefix); 1357 1358 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1359 struct net_device *dev, int strict) 1360 { 1361 struct inet6_ifaddr *ifp, *result = NULL; 1362 unsigned int hash = ipv6_addr_hash(addr); 1363 struct hlist_node *node; 1364 1365 rcu_read_lock_bh(); 1366 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1367 if (!net_eq(dev_net(ifp->idev->dev), net)) 1368 continue; 1369 if (ipv6_addr_equal(&ifp->addr, addr)) { 1370 if (dev == NULL || ifp->idev->dev == dev || 1371 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1372 result = ifp; 1373 in6_ifa_hold(ifp); 1374 break; 1375 } 1376 } 1377 } 1378 rcu_read_unlock_bh(); 1379 1380 return result; 1381 } 1382 1383 /* Gets referenced address, destroys ifaddr */ 1384 1385 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1386 { 1387 if (ifp->flags&IFA_F_PERMANENT) { 1388 spin_lock_bh(&ifp->lock); 1389 addrconf_del_timer(ifp); 1390 ifp->flags |= IFA_F_TENTATIVE; 1391 if (dad_failed) 1392 ifp->flags |= IFA_F_DADFAILED; 1393 spin_unlock_bh(&ifp->lock); 1394 if (dad_failed) 1395 ipv6_ifa_notify(0, ifp); 1396 in6_ifa_put(ifp); 1397 #ifdef CONFIG_IPV6_PRIVACY 1398 } else if (ifp->flags&IFA_F_TEMPORARY) { 1399 struct inet6_ifaddr *ifpub; 1400 spin_lock_bh(&ifp->lock); 1401 ifpub = ifp->ifpub; 1402 if (ifpub) { 1403 in6_ifa_hold(ifpub); 1404 spin_unlock_bh(&ifp->lock); 1405 ipv6_create_tempaddr(ifpub, ifp); 1406 in6_ifa_put(ifpub); 1407 } else { 1408 spin_unlock_bh(&ifp->lock); 1409 } 1410 ipv6_del_addr(ifp); 1411 #endif 1412 } else 1413 ipv6_del_addr(ifp); 1414 } 1415 1416 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1417 { 1418 int err = -ENOENT; 1419 1420 spin_lock(&ifp->state_lock); 1421 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1422 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1423 err = 0; 1424 } 1425 spin_unlock(&ifp->state_lock); 1426 1427 return err; 1428 } 1429 1430 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1431 { 1432 struct inet6_dev *idev = ifp->idev; 1433 1434 if (addrconf_dad_end(ifp)) { 1435 in6_ifa_put(ifp); 1436 return; 1437 } 1438 1439 if (net_ratelimit()) 1440 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1441 ifp->idev->dev->name, &ifp->addr); 1442 1443 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1444 struct in6_addr addr; 1445 1446 addr.s6_addr32[0] = htonl(0xfe800000); 1447 addr.s6_addr32[1] = 0; 1448 1449 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1450 ipv6_addr_equal(&ifp->addr, &addr)) { 1451 /* DAD failed for link-local based on MAC address */ 1452 idev->cnf.disable_ipv6 = 1; 1453 1454 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1455 ifp->idev->dev->name); 1456 } 1457 } 1458 1459 addrconf_dad_stop(ifp, 1); 1460 } 1461 1462 /* Join to solicited addr multicast group. */ 1463 1464 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1465 { 1466 struct in6_addr maddr; 1467 1468 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1469 return; 1470 1471 addrconf_addr_solict_mult(addr, &maddr); 1472 ipv6_dev_mc_inc(dev, &maddr); 1473 } 1474 1475 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1476 { 1477 struct in6_addr maddr; 1478 1479 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1480 return; 1481 1482 addrconf_addr_solict_mult(addr, &maddr); 1483 __ipv6_dev_mc_dec(idev, &maddr); 1484 } 1485 1486 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1487 { 1488 struct in6_addr addr; 1489 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1490 if (ipv6_addr_any(&addr)) 1491 return; 1492 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1493 } 1494 1495 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1496 { 1497 struct in6_addr addr; 1498 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1499 if (ipv6_addr_any(&addr)) 1500 return; 1501 __ipv6_dev_ac_dec(ifp->idev, &addr); 1502 } 1503 1504 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1505 { 1506 if (dev->addr_len != ETH_ALEN) 1507 return -1; 1508 memcpy(eui, dev->dev_addr, 3); 1509 memcpy(eui + 5, dev->dev_addr + 3, 3); 1510 1511 /* 1512 * The zSeries OSA network cards can be shared among various 1513 * OS instances, but the OSA cards have only one MAC address. 1514 * This leads to duplicate address conflicts in conjunction 1515 * with IPv6 if more than one instance uses the same card. 1516 * 1517 * The driver for these cards can deliver a unique 16-bit 1518 * identifier for each instance sharing the same card. It is 1519 * placed instead of 0xFFFE in the interface identifier. The 1520 * "u" bit of the interface identifier is not inverted in this 1521 * case. Hence the resulting interface identifier has local 1522 * scope according to RFC2373. 1523 */ 1524 if (dev->dev_id) { 1525 eui[3] = (dev->dev_id >> 8) & 0xFF; 1526 eui[4] = dev->dev_id & 0xFF; 1527 } else { 1528 eui[3] = 0xFF; 1529 eui[4] = 0xFE; 1530 eui[0] ^= 2; 1531 } 1532 return 0; 1533 } 1534 1535 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1536 { 1537 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1538 if (dev->addr_len != ARCNET_ALEN) 1539 return -1; 1540 memset(eui, 0, 7); 1541 eui[7] = *(u8*)dev->dev_addr; 1542 return 0; 1543 } 1544 1545 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1546 { 1547 if (dev->addr_len != INFINIBAND_ALEN) 1548 return -1; 1549 memcpy(eui, dev->dev_addr + 12, 8); 1550 eui[0] |= 2; 1551 return 0; 1552 } 1553 1554 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1555 { 1556 if (addr == 0) 1557 return -1; 1558 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1559 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1560 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1561 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1562 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1563 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1564 eui[1] = 0; 1565 eui[2] = 0x5E; 1566 eui[3] = 0xFE; 1567 memcpy(eui + 4, &addr, 4); 1568 return 0; 1569 } 1570 1571 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1572 { 1573 if (dev->priv_flags & IFF_ISATAP) 1574 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1575 return -1; 1576 } 1577 1578 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1579 { 1580 switch (dev->type) { 1581 case ARPHRD_ETHER: 1582 case ARPHRD_FDDI: 1583 case ARPHRD_IEEE802_TR: 1584 return addrconf_ifid_eui48(eui, dev); 1585 case ARPHRD_ARCNET: 1586 return addrconf_ifid_arcnet(eui, dev); 1587 case ARPHRD_INFINIBAND: 1588 return addrconf_ifid_infiniband(eui, dev); 1589 case ARPHRD_SIT: 1590 return addrconf_ifid_sit(eui, dev); 1591 } 1592 return -1; 1593 } 1594 1595 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1596 { 1597 int err = -1; 1598 struct inet6_ifaddr *ifp; 1599 1600 read_lock_bh(&idev->lock); 1601 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1602 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1603 memcpy(eui, ifp->addr.s6_addr+8, 8); 1604 err = 0; 1605 break; 1606 } 1607 } 1608 read_unlock_bh(&idev->lock); 1609 return err; 1610 } 1611 1612 #ifdef CONFIG_IPV6_PRIVACY 1613 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1614 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1615 { 1616 regen: 1617 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1618 idev->rndid[0] &= ~0x02; 1619 1620 /* 1621 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1622 * check if generated address is not inappropriate 1623 * 1624 * - Reserved subnet anycast (RFC 2526) 1625 * 11111101 11....11 1xxxxxxx 1626 * - ISATAP (RFC4214) 6.1 1627 * 00-00-5E-FE-xx-xx-xx-xx 1628 * - value 0 1629 * - XXX: already assigned to an address on the device 1630 */ 1631 if (idev->rndid[0] == 0xfd && 1632 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1633 (idev->rndid[7]&0x80)) 1634 goto regen; 1635 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1636 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1637 goto regen; 1638 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1639 goto regen; 1640 } 1641 1642 return 0; 1643 } 1644 1645 static void ipv6_regen_rndid(unsigned long data) 1646 { 1647 struct inet6_dev *idev = (struct inet6_dev *) data; 1648 unsigned long expires; 1649 1650 rcu_read_lock_bh(); 1651 write_lock_bh(&idev->lock); 1652 1653 if (idev->dead) 1654 goto out; 1655 1656 if (__ipv6_regen_rndid(idev) < 0) 1657 goto out; 1658 1659 expires = jiffies + 1660 idev->cnf.temp_prefered_lft * HZ - 1661 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1662 idev->cnf.max_desync_factor * HZ; 1663 if (time_before(expires, jiffies)) { 1664 printk(KERN_WARNING 1665 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1666 idev->dev->name); 1667 goto out; 1668 } 1669 1670 if (!mod_timer(&idev->regen_timer, expires)) 1671 in6_dev_hold(idev); 1672 1673 out: 1674 write_unlock_bh(&idev->lock); 1675 rcu_read_unlock_bh(); 1676 in6_dev_put(idev); 1677 } 1678 1679 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1680 int ret = 0; 1681 1682 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1683 ret = __ipv6_regen_rndid(idev); 1684 return ret; 1685 } 1686 #endif 1687 1688 /* 1689 * Add prefix route. 1690 */ 1691 1692 static void 1693 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1694 unsigned long expires, u32 flags) 1695 { 1696 struct fib6_config cfg = { 1697 .fc_table = RT6_TABLE_PREFIX, 1698 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1699 .fc_ifindex = dev->ifindex, 1700 .fc_expires = expires, 1701 .fc_dst_len = plen, 1702 .fc_flags = RTF_UP | flags, 1703 .fc_nlinfo.nl_net = dev_net(dev), 1704 .fc_protocol = RTPROT_KERNEL, 1705 }; 1706 1707 ipv6_addr_copy(&cfg.fc_dst, pfx); 1708 1709 /* Prevent useless cloning on PtP SIT. 1710 This thing is done here expecting that the whole 1711 class of non-broadcast devices need not cloning. 1712 */ 1713 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1714 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1715 cfg.fc_flags |= RTF_NONEXTHOP; 1716 #endif 1717 1718 ip6_route_add(&cfg); 1719 } 1720 1721 /* Create "default" multicast route to the interface */ 1722 1723 static void addrconf_add_mroute(struct net_device *dev) 1724 { 1725 struct fib6_config cfg = { 1726 .fc_table = RT6_TABLE_LOCAL, 1727 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1728 .fc_ifindex = dev->ifindex, 1729 .fc_dst_len = 8, 1730 .fc_flags = RTF_UP, 1731 .fc_nlinfo.nl_net = dev_net(dev), 1732 }; 1733 1734 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1735 1736 ip6_route_add(&cfg); 1737 } 1738 1739 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1740 static void sit_route_add(struct net_device *dev) 1741 { 1742 struct fib6_config cfg = { 1743 .fc_table = RT6_TABLE_MAIN, 1744 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1745 .fc_ifindex = dev->ifindex, 1746 .fc_dst_len = 96, 1747 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1748 .fc_nlinfo.nl_net = dev_net(dev), 1749 }; 1750 1751 /* prefix length - 96 bits "::d.d.d.d" */ 1752 ip6_route_add(&cfg); 1753 } 1754 #endif 1755 1756 static void addrconf_add_lroute(struct net_device *dev) 1757 { 1758 struct in6_addr addr; 1759 1760 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1761 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1762 } 1763 1764 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1765 { 1766 struct inet6_dev *idev; 1767 1768 ASSERT_RTNL(); 1769 1770 idev = ipv6_find_idev(dev); 1771 if (!idev) 1772 return ERR_PTR(-ENOBUFS); 1773 1774 if (idev->cnf.disable_ipv6) 1775 return ERR_PTR(-EACCES); 1776 1777 /* Add default multicast route */ 1778 addrconf_add_mroute(dev); 1779 1780 /* Add link local route */ 1781 addrconf_add_lroute(dev); 1782 return idev; 1783 } 1784 1785 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1786 { 1787 struct prefix_info *pinfo; 1788 __u32 valid_lft; 1789 __u32 prefered_lft; 1790 int addr_type; 1791 struct inet6_dev *in6_dev; 1792 struct net *net = dev_net(dev); 1793 1794 pinfo = (struct prefix_info *) opt; 1795 1796 if (len < sizeof(struct prefix_info)) { 1797 ADBG(("addrconf: prefix option too short\n")); 1798 return; 1799 } 1800 1801 /* 1802 * Validation checks ([ADDRCONF], page 19) 1803 */ 1804 1805 addr_type = ipv6_addr_type(&pinfo->prefix); 1806 1807 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1808 return; 1809 1810 valid_lft = ntohl(pinfo->valid); 1811 prefered_lft = ntohl(pinfo->prefered); 1812 1813 if (prefered_lft > valid_lft) { 1814 if (net_ratelimit()) 1815 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1816 return; 1817 } 1818 1819 in6_dev = in6_dev_get(dev); 1820 1821 if (in6_dev == NULL) { 1822 if (net_ratelimit()) 1823 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1824 return; 1825 } 1826 1827 /* 1828 * Two things going on here: 1829 * 1) Add routes for on-link prefixes 1830 * 2) Configure prefixes with the auto flag set 1831 */ 1832 1833 if (pinfo->onlink) { 1834 struct rt6_info *rt; 1835 unsigned long rt_expires; 1836 1837 /* Avoid arithmetic overflow. Really, we could 1838 * save rt_expires in seconds, likely valid_lft, 1839 * but it would require division in fib gc, that it 1840 * not good. 1841 */ 1842 if (HZ > USER_HZ) 1843 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1844 else 1845 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1846 1847 if (addrconf_finite_timeout(rt_expires)) 1848 rt_expires *= HZ; 1849 1850 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1851 dev->ifindex, 1); 1852 1853 if (rt && addrconf_is_prefix_route(rt)) { 1854 /* Autoconf prefix route */ 1855 if (valid_lft == 0) { 1856 ip6_del_rt(rt); 1857 rt = NULL; 1858 } else if (addrconf_finite_timeout(rt_expires)) { 1859 /* not infinity */ 1860 rt->rt6i_expires = jiffies + rt_expires; 1861 rt->rt6i_flags |= RTF_EXPIRES; 1862 } else { 1863 rt->rt6i_flags &= ~RTF_EXPIRES; 1864 rt->rt6i_expires = 0; 1865 } 1866 } else if (valid_lft) { 1867 clock_t expires = 0; 1868 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1869 if (addrconf_finite_timeout(rt_expires)) { 1870 /* not infinity */ 1871 flags |= RTF_EXPIRES; 1872 expires = jiffies_to_clock_t(rt_expires); 1873 } 1874 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1875 dev, expires, flags); 1876 } 1877 if (rt) 1878 dst_release(&rt->dst); 1879 } 1880 1881 /* Try to figure out our local address for this prefix */ 1882 1883 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1884 struct inet6_ifaddr * ifp; 1885 struct in6_addr addr; 1886 int create = 0, update_lft = 0; 1887 1888 if (pinfo->prefix_len == 64) { 1889 memcpy(&addr, &pinfo->prefix, 8); 1890 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1891 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1892 in6_dev_put(in6_dev); 1893 return; 1894 } 1895 goto ok; 1896 } 1897 if (net_ratelimit()) 1898 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1899 pinfo->prefix_len); 1900 in6_dev_put(in6_dev); 1901 return; 1902 1903 ok: 1904 1905 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1906 1907 if (ifp == NULL && valid_lft) { 1908 int max_addresses = in6_dev->cnf.max_addresses; 1909 u32 addr_flags = 0; 1910 1911 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1912 if (in6_dev->cnf.optimistic_dad && 1913 !net->ipv6.devconf_all->forwarding) 1914 addr_flags = IFA_F_OPTIMISTIC; 1915 #endif 1916 1917 /* Do not allow to create too much of autoconfigured 1918 * addresses; this would be too easy way to crash kernel. 1919 */ 1920 if (!max_addresses || 1921 ipv6_count_addresses(in6_dev) < max_addresses) 1922 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1923 addr_type&IPV6_ADDR_SCOPE_MASK, 1924 addr_flags); 1925 1926 if (!ifp || IS_ERR(ifp)) { 1927 in6_dev_put(in6_dev); 1928 return; 1929 } 1930 1931 update_lft = create = 1; 1932 ifp->cstamp = jiffies; 1933 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1934 } 1935 1936 if (ifp) { 1937 int flags; 1938 unsigned long now; 1939 #ifdef CONFIG_IPV6_PRIVACY 1940 struct inet6_ifaddr *ift; 1941 #endif 1942 u32 stored_lft; 1943 1944 /* update lifetime (RFC2462 5.5.3 e) */ 1945 spin_lock(&ifp->lock); 1946 now = jiffies; 1947 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1948 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1949 else 1950 stored_lft = 0; 1951 if (!update_lft && stored_lft) { 1952 if (valid_lft > MIN_VALID_LIFETIME || 1953 valid_lft > stored_lft) 1954 update_lft = 1; 1955 else if (stored_lft <= MIN_VALID_LIFETIME) { 1956 /* valid_lft <= stored_lft is always true */ 1957 /* 1958 * RFC 4862 Section 5.5.3e: 1959 * "Note that the preferred lifetime of 1960 * the corresponding address is always 1961 * reset to the Preferred Lifetime in 1962 * the received Prefix Information 1963 * option, regardless of whether the 1964 * valid lifetime is also reset or 1965 * ignored." 1966 * 1967 * So if the preferred lifetime in 1968 * this advertisement is different 1969 * than what we have stored, but the 1970 * valid lifetime is invalid, just 1971 * reset prefered_lft. 1972 * 1973 * We must set the valid lifetime 1974 * to the stored lifetime since we'll 1975 * be updating the timestamp below, 1976 * else we'll set it back to the 1977 * minumum. 1978 */ 1979 if (prefered_lft != ifp->prefered_lft) { 1980 valid_lft = stored_lft; 1981 update_lft = 1; 1982 } 1983 } else { 1984 valid_lft = MIN_VALID_LIFETIME; 1985 if (valid_lft < prefered_lft) 1986 prefered_lft = valid_lft; 1987 update_lft = 1; 1988 } 1989 } 1990 1991 if (update_lft) { 1992 ifp->valid_lft = valid_lft; 1993 ifp->prefered_lft = prefered_lft; 1994 ifp->tstamp = now; 1995 flags = ifp->flags; 1996 ifp->flags &= ~IFA_F_DEPRECATED; 1997 spin_unlock(&ifp->lock); 1998 1999 if (!(flags&IFA_F_TENTATIVE)) 2000 ipv6_ifa_notify(0, ifp); 2001 } else 2002 spin_unlock(&ifp->lock); 2003 2004 #ifdef CONFIG_IPV6_PRIVACY 2005 read_lock_bh(&in6_dev->lock); 2006 /* update all temporary addresses in the list */ 2007 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) { 2008 /* 2009 * When adjusting the lifetimes of an existing 2010 * temporary address, only lower the lifetimes. 2011 * Implementations must not increase the 2012 * lifetimes of an existing temporary address 2013 * when processing a Prefix Information Option. 2014 */ 2015 if (ifp != ift->ifpub) 2016 continue; 2017 2018 spin_lock(&ift->lock); 2019 flags = ift->flags; 2020 if (ift->valid_lft > valid_lft && 2021 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 2022 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 2023 if (ift->prefered_lft > prefered_lft && 2024 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 2025 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 2026 spin_unlock(&ift->lock); 2027 if (!(flags&IFA_F_TENTATIVE)) 2028 ipv6_ifa_notify(0, ift); 2029 } 2030 2031 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2032 /* 2033 * When a new public address is created as described in [ADDRCONF], 2034 * also create a new temporary address. Also create a temporary 2035 * address if it's enabled but no temporary address currently exists. 2036 */ 2037 read_unlock_bh(&in6_dev->lock); 2038 ipv6_create_tempaddr(ifp, NULL); 2039 } else { 2040 read_unlock_bh(&in6_dev->lock); 2041 } 2042 #endif 2043 in6_ifa_put(ifp); 2044 addrconf_verify(0); 2045 } 2046 } 2047 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2048 in6_dev_put(in6_dev); 2049 } 2050 2051 /* 2052 * Set destination address. 2053 * Special case for SIT interfaces where we create a new "virtual" 2054 * device. 2055 */ 2056 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2057 { 2058 struct in6_ifreq ireq; 2059 struct net_device *dev; 2060 int err = -EINVAL; 2061 2062 rtnl_lock(); 2063 2064 err = -EFAULT; 2065 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2066 goto err_exit; 2067 2068 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2069 2070 err = -ENODEV; 2071 if (dev == NULL) 2072 goto err_exit; 2073 2074 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2075 if (dev->type == ARPHRD_SIT) { 2076 const struct net_device_ops *ops = dev->netdev_ops; 2077 struct ifreq ifr; 2078 struct ip_tunnel_parm p; 2079 2080 err = -EADDRNOTAVAIL; 2081 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2082 goto err_exit; 2083 2084 memset(&p, 0, sizeof(p)); 2085 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2086 p.iph.saddr = 0; 2087 p.iph.version = 4; 2088 p.iph.ihl = 5; 2089 p.iph.protocol = IPPROTO_IPV6; 2090 p.iph.ttl = 64; 2091 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2092 2093 if (ops->ndo_do_ioctl) { 2094 mm_segment_t oldfs = get_fs(); 2095 2096 set_fs(KERNEL_DS); 2097 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2098 set_fs(oldfs); 2099 } else 2100 err = -EOPNOTSUPP; 2101 2102 if (err == 0) { 2103 err = -ENOBUFS; 2104 dev = __dev_get_by_name(net, p.name); 2105 if (!dev) 2106 goto err_exit; 2107 err = dev_open(dev); 2108 } 2109 } 2110 #endif 2111 2112 err_exit: 2113 rtnl_unlock(); 2114 return err; 2115 } 2116 2117 /* 2118 * Manual configuration of address on an interface 2119 */ 2120 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2121 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2122 __u32 valid_lft) 2123 { 2124 struct inet6_ifaddr *ifp; 2125 struct inet6_dev *idev; 2126 struct net_device *dev; 2127 int scope; 2128 u32 flags; 2129 clock_t expires; 2130 unsigned long timeout; 2131 2132 ASSERT_RTNL(); 2133 2134 if (plen > 128) 2135 return -EINVAL; 2136 2137 /* check the lifetime */ 2138 if (!valid_lft || prefered_lft > valid_lft) 2139 return -EINVAL; 2140 2141 dev = __dev_get_by_index(net, ifindex); 2142 if (!dev) 2143 return -ENODEV; 2144 2145 idev = addrconf_add_dev(dev); 2146 if (IS_ERR(idev)) 2147 return PTR_ERR(idev); 2148 2149 scope = ipv6_addr_scope(pfx); 2150 2151 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2152 if (addrconf_finite_timeout(timeout)) { 2153 expires = jiffies_to_clock_t(timeout * HZ); 2154 valid_lft = timeout; 2155 flags = RTF_EXPIRES; 2156 } else { 2157 expires = 0; 2158 flags = 0; 2159 ifa_flags |= IFA_F_PERMANENT; 2160 } 2161 2162 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2163 if (addrconf_finite_timeout(timeout)) { 2164 if (timeout == 0) 2165 ifa_flags |= IFA_F_DEPRECATED; 2166 prefered_lft = timeout; 2167 } 2168 2169 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2170 2171 if (!IS_ERR(ifp)) { 2172 spin_lock_bh(&ifp->lock); 2173 ifp->valid_lft = valid_lft; 2174 ifp->prefered_lft = prefered_lft; 2175 ifp->tstamp = jiffies; 2176 spin_unlock_bh(&ifp->lock); 2177 2178 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2179 expires, flags); 2180 /* 2181 * Note that section 3.1 of RFC 4429 indicates 2182 * that the Optimistic flag should not be set for 2183 * manually configured addresses 2184 */ 2185 addrconf_dad_start(ifp, 0); 2186 in6_ifa_put(ifp); 2187 addrconf_verify(0); 2188 return 0; 2189 } 2190 2191 return PTR_ERR(ifp); 2192 } 2193 2194 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2195 unsigned int plen) 2196 { 2197 struct inet6_ifaddr *ifp; 2198 struct inet6_dev *idev; 2199 struct net_device *dev; 2200 2201 if (plen > 128) 2202 return -EINVAL; 2203 2204 dev = __dev_get_by_index(net, ifindex); 2205 if (!dev) 2206 return -ENODEV; 2207 2208 if ((idev = __in6_dev_get(dev)) == NULL) 2209 return -ENXIO; 2210 2211 read_lock_bh(&idev->lock); 2212 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2213 if (ifp->prefix_len == plen && 2214 ipv6_addr_equal(pfx, &ifp->addr)) { 2215 in6_ifa_hold(ifp); 2216 read_unlock_bh(&idev->lock); 2217 2218 ipv6_del_addr(ifp); 2219 2220 /* If the last address is deleted administratively, 2221 disable IPv6 on this interface. 2222 */ 2223 if (list_empty(&idev->addr_list)) 2224 addrconf_ifdown(idev->dev, 1); 2225 return 0; 2226 } 2227 } 2228 read_unlock_bh(&idev->lock); 2229 return -EADDRNOTAVAIL; 2230 } 2231 2232 2233 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2234 { 2235 struct in6_ifreq ireq; 2236 int err; 2237 2238 if (!capable(CAP_NET_ADMIN)) 2239 return -EPERM; 2240 2241 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2242 return -EFAULT; 2243 2244 rtnl_lock(); 2245 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2246 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2247 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2248 rtnl_unlock(); 2249 return err; 2250 } 2251 2252 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2253 { 2254 struct in6_ifreq ireq; 2255 int err; 2256 2257 if (!capable(CAP_NET_ADMIN)) 2258 return -EPERM; 2259 2260 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2261 return -EFAULT; 2262 2263 rtnl_lock(); 2264 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2265 ireq.ifr6_prefixlen); 2266 rtnl_unlock(); 2267 return err; 2268 } 2269 2270 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2271 int plen, int scope) 2272 { 2273 struct inet6_ifaddr *ifp; 2274 2275 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2276 if (!IS_ERR(ifp)) { 2277 spin_lock_bh(&ifp->lock); 2278 ifp->flags &= ~IFA_F_TENTATIVE; 2279 spin_unlock_bh(&ifp->lock); 2280 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2281 in6_ifa_put(ifp); 2282 } 2283 } 2284 2285 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2286 static void sit_add_v4_addrs(struct inet6_dev *idev) 2287 { 2288 struct in6_addr addr; 2289 struct net_device *dev; 2290 struct net *net = dev_net(idev->dev); 2291 int scope; 2292 2293 ASSERT_RTNL(); 2294 2295 memset(&addr, 0, sizeof(struct in6_addr)); 2296 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2297 2298 if (idev->dev->flags&IFF_POINTOPOINT) { 2299 addr.s6_addr32[0] = htonl(0xfe800000); 2300 scope = IFA_LINK; 2301 } else { 2302 scope = IPV6_ADDR_COMPATv4; 2303 } 2304 2305 if (addr.s6_addr32[3]) { 2306 add_addr(idev, &addr, 128, scope); 2307 return; 2308 } 2309 2310 for_each_netdev(net, dev) { 2311 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2312 if (in_dev && (dev->flags & IFF_UP)) { 2313 struct in_ifaddr * ifa; 2314 2315 int flag = scope; 2316 2317 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2318 int plen; 2319 2320 addr.s6_addr32[3] = ifa->ifa_local; 2321 2322 if (ifa->ifa_scope == RT_SCOPE_LINK) 2323 continue; 2324 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2325 if (idev->dev->flags&IFF_POINTOPOINT) 2326 continue; 2327 flag |= IFA_HOST; 2328 } 2329 if (idev->dev->flags&IFF_POINTOPOINT) 2330 plen = 64; 2331 else 2332 plen = 96; 2333 2334 add_addr(idev, &addr, plen, flag); 2335 } 2336 } 2337 } 2338 } 2339 #endif 2340 2341 static void init_loopback(struct net_device *dev) 2342 { 2343 struct inet6_dev *idev; 2344 2345 /* ::1 */ 2346 2347 ASSERT_RTNL(); 2348 2349 if ((idev = ipv6_find_idev(dev)) == NULL) { 2350 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2351 return; 2352 } 2353 2354 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2355 } 2356 2357 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2358 { 2359 struct inet6_ifaddr * ifp; 2360 u32 addr_flags = IFA_F_PERMANENT; 2361 2362 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2363 if (idev->cnf.optimistic_dad && 2364 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2365 addr_flags |= IFA_F_OPTIMISTIC; 2366 #endif 2367 2368 2369 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2370 if (!IS_ERR(ifp)) { 2371 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2372 addrconf_dad_start(ifp, 0); 2373 in6_ifa_put(ifp); 2374 } 2375 } 2376 2377 static void addrconf_dev_config(struct net_device *dev) 2378 { 2379 struct in6_addr addr; 2380 struct inet6_dev * idev; 2381 2382 ASSERT_RTNL(); 2383 2384 if ((dev->type != ARPHRD_ETHER) && 2385 (dev->type != ARPHRD_FDDI) && 2386 (dev->type != ARPHRD_IEEE802_TR) && 2387 (dev->type != ARPHRD_ARCNET) && 2388 (dev->type != ARPHRD_INFINIBAND)) { 2389 /* Alas, we support only Ethernet autoconfiguration. */ 2390 return; 2391 } 2392 2393 idev = addrconf_add_dev(dev); 2394 if (IS_ERR(idev)) 2395 return; 2396 2397 memset(&addr, 0, sizeof(struct in6_addr)); 2398 addr.s6_addr32[0] = htonl(0xFE800000); 2399 2400 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2401 addrconf_add_linklocal(idev, &addr); 2402 } 2403 2404 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2405 static void addrconf_sit_config(struct net_device *dev) 2406 { 2407 struct inet6_dev *idev; 2408 2409 ASSERT_RTNL(); 2410 2411 /* 2412 * Configure the tunnel with one of our IPv4 2413 * addresses... we should configure all of 2414 * our v4 addrs in the tunnel 2415 */ 2416 2417 if ((idev = ipv6_find_idev(dev)) == NULL) { 2418 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2419 return; 2420 } 2421 2422 if (dev->priv_flags & IFF_ISATAP) { 2423 struct in6_addr addr; 2424 2425 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2426 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2427 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2428 addrconf_add_linklocal(idev, &addr); 2429 return; 2430 } 2431 2432 sit_add_v4_addrs(idev); 2433 2434 if (dev->flags&IFF_POINTOPOINT) { 2435 addrconf_add_mroute(dev); 2436 addrconf_add_lroute(dev); 2437 } else 2438 sit_route_add(dev); 2439 } 2440 #endif 2441 2442 static inline int 2443 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2444 { 2445 struct in6_addr lladdr; 2446 2447 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2448 addrconf_add_linklocal(idev, &lladdr); 2449 return 0; 2450 } 2451 return -1; 2452 } 2453 2454 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2455 { 2456 struct net_device *link_dev; 2457 struct net *net = dev_net(idev->dev); 2458 2459 /* first try to inherit the link-local address from the link device */ 2460 if (idev->dev->iflink && 2461 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2462 if (!ipv6_inherit_linklocal(idev, link_dev)) 2463 return; 2464 } 2465 /* then try to inherit it from any device */ 2466 for_each_netdev(net, link_dev) { 2467 if (!ipv6_inherit_linklocal(idev, link_dev)) 2468 return; 2469 } 2470 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2471 } 2472 2473 /* 2474 * Autoconfigure tunnel with a link-local address so routing protocols, 2475 * DHCPv6, MLD etc. can be run over the virtual link 2476 */ 2477 2478 static void addrconf_ip6_tnl_config(struct net_device *dev) 2479 { 2480 struct inet6_dev *idev; 2481 2482 ASSERT_RTNL(); 2483 2484 idev = addrconf_add_dev(dev); 2485 if (IS_ERR(idev)) { 2486 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2487 return; 2488 } 2489 ip6_tnl_add_linklocal(idev); 2490 } 2491 2492 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2493 void * data) 2494 { 2495 struct net_device *dev = (struct net_device *) data; 2496 struct inet6_dev *idev = __in6_dev_get(dev); 2497 int run_pending = 0; 2498 int err; 2499 2500 switch (event) { 2501 case NETDEV_REGISTER: 2502 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2503 idev = ipv6_add_dev(dev); 2504 if (!idev) 2505 return notifier_from_errno(-ENOMEM); 2506 } 2507 break; 2508 2509 case NETDEV_UP: 2510 case NETDEV_CHANGE: 2511 if (dev->flags & IFF_SLAVE) 2512 break; 2513 2514 if (event == NETDEV_UP) { 2515 if (!addrconf_qdisc_ok(dev)) { 2516 /* device is not ready yet. */ 2517 printk(KERN_INFO 2518 "ADDRCONF(NETDEV_UP): %s: " 2519 "link is not ready\n", 2520 dev->name); 2521 break; 2522 } 2523 2524 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2525 idev = ipv6_add_dev(dev); 2526 2527 if (idev) { 2528 idev->if_flags |= IF_READY; 2529 run_pending = 1; 2530 } 2531 } else { 2532 if (!addrconf_qdisc_ok(dev)) { 2533 /* device is still not ready. */ 2534 break; 2535 } 2536 2537 if (idev) { 2538 if (idev->if_flags & IF_READY) 2539 /* device is already configured. */ 2540 break; 2541 idev->if_flags |= IF_READY; 2542 } 2543 2544 printk(KERN_INFO 2545 "ADDRCONF(NETDEV_CHANGE): %s: " 2546 "link becomes ready\n", 2547 dev->name); 2548 2549 run_pending = 1; 2550 } 2551 2552 switch (dev->type) { 2553 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2554 case ARPHRD_SIT: 2555 addrconf_sit_config(dev); 2556 break; 2557 #endif 2558 case ARPHRD_TUNNEL6: 2559 addrconf_ip6_tnl_config(dev); 2560 break; 2561 case ARPHRD_LOOPBACK: 2562 init_loopback(dev); 2563 break; 2564 2565 default: 2566 addrconf_dev_config(dev); 2567 break; 2568 } 2569 2570 if (idev) { 2571 if (run_pending) 2572 addrconf_dad_run(idev); 2573 2574 /* 2575 * If the MTU changed during the interface down, 2576 * when the interface up, the changed MTU must be 2577 * reflected in the idev as well as routers. 2578 */ 2579 if (idev->cnf.mtu6 != dev->mtu && 2580 dev->mtu >= IPV6_MIN_MTU) { 2581 rt6_mtu_change(dev, dev->mtu); 2582 idev->cnf.mtu6 = dev->mtu; 2583 } 2584 idev->tstamp = jiffies; 2585 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2586 2587 /* 2588 * If the changed mtu during down is lower than 2589 * IPV6_MIN_MTU stop IPv6 on this interface. 2590 */ 2591 if (dev->mtu < IPV6_MIN_MTU) 2592 addrconf_ifdown(dev, 1); 2593 } 2594 break; 2595 2596 case NETDEV_CHANGEMTU: 2597 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2598 rt6_mtu_change(dev, dev->mtu); 2599 idev->cnf.mtu6 = dev->mtu; 2600 break; 2601 } 2602 2603 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2604 idev = ipv6_add_dev(dev); 2605 if (idev) 2606 break; 2607 } 2608 2609 /* 2610 * MTU falled under IPV6_MIN_MTU. 2611 * Stop IPv6 on this interface. 2612 */ 2613 2614 case NETDEV_DOWN: 2615 case NETDEV_UNREGISTER: 2616 /* 2617 * Remove all addresses from this interface. 2618 */ 2619 addrconf_ifdown(dev, event != NETDEV_DOWN); 2620 break; 2621 2622 case NETDEV_CHANGENAME: 2623 if (idev) { 2624 snmp6_unregister_dev(idev); 2625 addrconf_sysctl_unregister(idev); 2626 addrconf_sysctl_register(idev); 2627 err = snmp6_register_dev(idev); 2628 if (err) 2629 return notifier_from_errno(err); 2630 } 2631 break; 2632 2633 case NETDEV_PRE_TYPE_CHANGE: 2634 case NETDEV_POST_TYPE_CHANGE: 2635 addrconf_type_change(dev, event); 2636 break; 2637 } 2638 2639 return NOTIFY_OK; 2640 } 2641 2642 /* 2643 * addrconf module should be notified of a device going up 2644 */ 2645 static struct notifier_block ipv6_dev_notf = { 2646 .notifier_call = addrconf_notify, 2647 }; 2648 2649 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2650 { 2651 struct inet6_dev *idev; 2652 ASSERT_RTNL(); 2653 2654 idev = __in6_dev_get(dev); 2655 2656 if (event == NETDEV_POST_TYPE_CHANGE) 2657 ipv6_mc_remap(idev); 2658 else if (event == NETDEV_PRE_TYPE_CHANGE) 2659 ipv6_mc_unmap(idev); 2660 } 2661 2662 static int addrconf_ifdown(struct net_device *dev, int how) 2663 { 2664 struct net *net = dev_net(dev); 2665 struct inet6_dev *idev; 2666 struct inet6_ifaddr *ifa; 2667 LIST_HEAD(keep_list); 2668 int state; 2669 2670 ASSERT_RTNL(); 2671 2672 /* Flush routes if device is being removed or it is not loopback */ 2673 if (how || !(dev->flags & IFF_LOOPBACK)) 2674 rt6_ifdown(net, dev); 2675 2676 idev = __in6_dev_get(dev); 2677 if (idev == NULL) 2678 return -ENODEV; 2679 2680 /* 2681 * Step 1: remove reference to ipv6 device from parent device. 2682 * Do not dev_put! 2683 */ 2684 if (how) { 2685 idev->dead = 1; 2686 2687 /* protected by rtnl_lock */ 2688 rcu_assign_pointer(dev->ip6_ptr, NULL); 2689 2690 /* Step 1.5: remove snmp6 entry */ 2691 snmp6_unregister_dev(idev); 2692 2693 } 2694 2695 write_lock_bh(&idev->lock); 2696 2697 /* Step 2: clear flags for stateless addrconf */ 2698 if (!how) 2699 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2700 2701 #ifdef CONFIG_IPV6_PRIVACY 2702 if (how && del_timer(&idev->regen_timer)) 2703 in6_dev_put(idev); 2704 2705 /* Step 3: clear tempaddr list */ 2706 while (!list_empty(&idev->tempaddr_list)) { 2707 ifa = list_first_entry(&idev->tempaddr_list, 2708 struct inet6_ifaddr, tmp_list); 2709 list_del(&ifa->tmp_list); 2710 write_unlock_bh(&idev->lock); 2711 spin_lock_bh(&ifa->lock); 2712 2713 if (ifa->ifpub) { 2714 in6_ifa_put(ifa->ifpub); 2715 ifa->ifpub = NULL; 2716 } 2717 spin_unlock_bh(&ifa->lock); 2718 in6_ifa_put(ifa); 2719 write_lock_bh(&idev->lock); 2720 } 2721 #endif 2722 2723 while (!list_empty(&idev->addr_list)) { 2724 ifa = list_first_entry(&idev->addr_list, 2725 struct inet6_ifaddr, if_list); 2726 addrconf_del_timer(ifa); 2727 2728 /* If just doing link down, and address is permanent 2729 and not link-local, then retain it. */ 2730 if (!how && 2731 (ifa->flags&IFA_F_PERMANENT) && 2732 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) { 2733 list_move_tail(&ifa->if_list, &keep_list); 2734 2735 /* If not doing DAD on this address, just keep it. */ 2736 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) || 2737 idev->cnf.accept_dad <= 0 || 2738 (ifa->flags & IFA_F_NODAD)) 2739 continue; 2740 2741 /* If it was tentative already, no need to notify */ 2742 if (ifa->flags & IFA_F_TENTATIVE) 2743 continue; 2744 2745 /* Flag it for later restoration when link comes up */ 2746 ifa->flags |= IFA_F_TENTATIVE; 2747 ifa->state = INET6_IFADDR_STATE_DAD; 2748 } else { 2749 list_del(&ifa->if_list); 2750 2751 /* clear hash table */ 2752 spin_lock_bh(&addrconf_hash_lock); 2753 hlist_del_init_rcu(&ifa->addr_lst); 2754 spin_unlock_bh(&addrconf_hash_lock); 2755 2756 write_unlock_bh(&idev->lock); 2757 spin_lock_bh(&ifa->state_lock); 2758 state = ifa->state; 2759 ifa->state = INET6_IFADDR_STATE_DEAD; 2760 spin_unlock_bh(&ifa->state_lock); 2761 2762 if (state != INET6_IFADDR_STATE_DEAD) { 2763 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2764 atomic_notifier_call_chain(&inet6addr_chain, 2765 NETDEV_DOWN, ifa); 2766 } 2767 2768 in6_ifa_put(ifa); 2769 write_lock_bh(&idev->lock); 2770 } 2771 } 2772 2773 list_splice(&keep_list, &idev->addr_list); 2774 2775 write_unlock_bh(&idev->lock); 2776 2777 /* Step 5: Discard multicast list */ 2778 if (how) 2779 ipv6_mc_destroy_dev(idev); 2780 else 2781 ipv6_mc_down(idev); 2782 2783 idev->tstamp = jiffies; 2784 2785 /* Last: Shot the device (if unregistered) */ 2786 if (how) { 2787 addrconf_sysctl_unregister(idev); 2788 neigh_parms_release(&nd_tbl, idev->nd_parms); 2789 neigh_ifdown(&nd_tbl, dev); 2790 in6_dev_put(idev); 2791 } 2792 return 0; 2793 } 2794 2795 static void addrconf_rs_timer(unsigned long data) 2796 { 2797 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2798 struct inet6_dev *idev = ifp->idev; 2799 2800 read_lock(&idev->lock); 2801 if (idev->dead || !(idev->if_flags & IF_READY)) 2802 goto out; 2803 2804 if (idev->cnf.forwarding) 2805 goto out; 2806 2807 /* Announcement received after solicitation was sent */ 2808 if (idev->if_flags & IF_RA_RCVD) 2809 goto out; 2810 2811 spin_lock(&ifp->lock); 2812 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2813 /* The wait after the last probe can be shorter */ 2814 addrconf_mod_timer(ifp, AC_RS, 2815 (ifp->probes == idev->cnf.rtr_solicits) ? 2816 idev->cnf.rtr_solicit_delay : 2817 idev->cnf.rtr_solicit_interval); 2818 spin_unlock(&ifp->lock); 2819 2820 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2821 } else { 2822 spin_unlock(&ifp->lock); 2823 /* 2824 * Note: we do not support deprecated "all on-link" 2825 * assumption any longer. 2826 */ 2827 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2828 idev->dev->name); 2829 } 2830 2831 out: 2832 read_unlock(&idev->lock); 2833 in6_ifa_put(ifp); 2834 } 2835 2836 /* 2837 * Duplicate Address Detection 2838 */ 2839 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2840 { 2841 unsigned long rand_num; 2842 struct inet6_dev *idev = ifp->idev; 2843 2844 if (ifp->flags & IFA_F_OPTIMISTIC) 2845 rand_num = 0; 2846 else 2847 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2848 2849 ifp->probes = idev->cnf.dad_transmits; 2850 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2851 } 2852 2853 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2854 { 2855 struct inet6_dev *idev = ifp->idev; 2856 struct net_device *dev = idev->dev; 2857 2858 addrconf_join_solict(dev, &ifp->addr); 2859 2860 net_srandom(ifp->addr.s6_addr32[3]); 2861 2862 read_lock_bh(&idev->lock); 2863 spin_lock(&ifp->lock); 2864 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2865 goto out; 2866 2867 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2868 idev->cnf.accept_dad < 1 || 2869 !(ifp->flags&IFA_F_TENTATIVE) || 2870 ifp->flags & IFA_F_NODAD) { 2871 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2872 spin_unlock(&ifp->lock); 2873 read_unlock_bh(&idev->lock); 2874 2875 addrconf_dad_completed(ifp); 2876 return; 2877 } 2878 2879 if (!(idev->if_flags & IF_READY)) { 2880 spin_unlock(&ifp->lock); 2881 read_unlock_bh(&idev->lock); 2882 /* 2883 * If the device is not ready: 2884 * - keep it tentative if it is a permanent address. 2885 * - otherwise, kill it. 2886 */ 2887 in6_ifa_hold(ifp); 2888 addrconf_dad_stop(ifp, 0); 2889 return; 2890 } 2891 2892 /* 2893 * Optimistic nodes can start receiving 2894 * Frames right away 2895 */ 2896 if (ifp->flags & IFA_F_OPTIMISTIC) 2897 ip6_ins_rt(ifp->rt); 2898 2899 addrconf_dad_kick(ifp); 2900 out: 2901 spin_unlock(&ifp->lock); 2902 read_unlock_bh(&idev->lock); 2903 } 2904 2905 static void addrconf_dad_timer(unsigned long data) 2906 { 2907 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2908 struct inet6_dev *idev = ifp->idev; 2909 struct in6_addr mcaddr; 2910 2911 if (!ifp->probes && addrconf_dad_end(ifp)) 2912 goto out; 2913 2914 read_lock(&idev->lock); 2915 if (idev->dead || !(idev->if_flags & IF_READY)) { 2916 read_unlock(&idev->lock); 2917 goto out; 2918 } 2919 2920 spin_lock(&ifp->lock); 2921 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2922 spin_unlock(&ifp->lock); 2923 read_unlock(&idev->lock); 2924 goto out; 2925 } 2926 2927 if (ifp->probes == 0) { 2928 /* 2929 * DAD was successful 2930 */ 2931 2932 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2933 spin_unlock(&ifp->lock); 2934 read_unlock(&idev->lock); 2935 2936 addrconf_dad_completed(ifp); 2937 2938 goto out; 2939 } 2940 2941 ifp->probes--; 2942 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2943 spin_unlock(&ifp->lock); 2944 read_unlock(&idev->lock); 2945 2946 /* send a neighbour solicitation for our addr */ 2947 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2948 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2949 out: 2950 in6_ifa_put(ifp); 2951 } 2952 2953 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2954 { 2955 struct net_device *dev = ifp->idev->dev; 2956 2957 /* 2958 * Configure the address for reception. Now it is valid. 2959 */ 2960 2961 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2962 2963 /* If added prefix is link local and forwarding is off, 2964 start sending router solicitations. 2965 */ 2966 2967 if ((ifp->idev->cnf.forwarding == 0 || 2968 ifp->idev->cnf.forwarding == 2) && 2969 ifp->idev->cnf.rtr_solicits > 0 && 2970 (dev->flags&IFF_LOOPBACK) == 0 && 2971 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2972 /* 2973 * If a host as already performed a random delay 2974 * [...] as part of DAD [...] there is no need 2975 * to delay again before sending the first RS 2976 */ 2977 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2978 2979 spin_lock_bh(&ifp->lock); 2980 ifp->probes = 1; 2981 ifp->idev->if_flags |= IF_RS_SENT; 2982 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2983 spin_unlock_bh(&ifp->lock); 2984 } 2985 } 2986 2987 static void addrconf_dad_run(struct inet6_dev *idev) 2988 { 2989 struct inet6_ifaddr *ifp; 2990 2991 read_lock_bh(&idev->lock); 2992 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2993 spin_lock(&ifp->lock); 2994 if (ifp->flags & IFA_F_TENTATIVE && 2995 ifp->state == INET6_IFADDR_STATE_DAD) 2996 addrconf_dad_kick(ifp); 2997 spin_unlock(&ifp->lock); 2998 } 2999 read_unlock_bh(&idev->lock); 3000 } 3001 3002 #ifdef CONFIG_PROC_FS 3003 struct if6_iter_state { 3004 struct seq_net_private p; 3005 int bucket; 3006 }; 3007 3008 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 3009 { 3010 struct inet6_ifaddr *ifa = NULL; 3011 struct if6_iter_state *state = seq->private; 3012 struct net *net = seq_file_net(seq); 3013 3014 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3015 struct hlist_node *n; 3016 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3017 addr_lst) 3018 if (net_eq(dev_net(ifa->idev->dev), net)) 3019 return ifa; 3020 } 3021 return NULL; 3022 } 3023 3024 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3025 struct inet6_ifaddr *ifa) 3026 { 3027 struct if6_iter_state *state = seq->private; 3028 struct net *net = seq_file_net(seq); 3029 struct hlist_node *n = &ifa->addr_lst; 3030 3031 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) 3032 if (net_eq(dev_net(ifa->idev->dev), net)) 3033 return ifa; 3034 3035 while (++state->bucket < IN6_ADDR_HSIZE) { 3036 hlist_for_each_entry_rcu_bh(ifa, n, 3037 &inet6_addr_lst[state->bucket], addr_lst) { 3038 if (net_eq(dev_net(ifa->idev->dev), net)) 3039 return ifa; 3040 } 3041 } 3042 3043 return NULL; 3044 } 3045 3046 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3047 { 3048 struct inet6_ifaddr *ifa = if6_get_first(seq); 3049 3050 if (ifa) 3051 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3052 --pos; 3053 return pos ? NULL : ifa; 3054 } 3055 3056 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3057 __acquires(rcu_bh) 3058 { 3059 rcu_read_lock_bh(); 3060 return if6_get_idx(seq, *pos); 3061 } 3062 3063 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3064 { 3065 struct inet6_ifaddr *ifa; 3066 3067 ifa = if6_get_next(seq, v); 3068 ++*pos; 3069 return ifa; 3070 } 3071 3072 static void if6_seq_stop(struct seq_file *seq, void *v) 3073 __releases(rcu_bh) 3074 { 3075 rcu_read_unlock_bh(); 3076 } 3077 3078 static int if6_seq_show(struct seq_file *seq, void *v) 3079 { 3080 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3081 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3082 &ifp->addr, 3083 ifp->idev->dev->ifindex, 3084 ifp->prefix_len, 3085 ifp->scope, 3086 ifp->flags, 3087 ifp->idev->dev->name); 3088 return 0; 3089 } 3090 3091 static const struct seq_operations if6_seq_ops = { 3092 .start = if6_seq_start, 3093 .next = if6_seq_next, 3094 .show = if6_seq_show, 3095 .stop = if6_seq_stop, 3096 }; 3097 3098 static int if6_seq_open(struct inode *inode, struct file *file) 3099 { 3100 return seq_open_net(inode, file, &if6_seq_ops, 3101 sizeof(struct if6_iter_state)); 3102 } 3103 3104 static const struct file_operations if6_fops = { 3105 .owner = THIS_MODULE, 3106 .open = if6_seq_open, 3107 .read = seq_read, 3108 .llseek = seq_lseek, 3109 .release = seq_release_net, 3110 }; 3111 3112 static int __net_init if6_proc_net_init(struct net *net) 3113 { 3114 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3115 return -ENOMEM; 3116 return 0; 3117 } 3118 3119 static void __net_exit if6_proc_net_exit(struct net *net) 3120 { 3121 proc_net_remove(net, "if_inet6"); 3122 } 3123 3124 static struct pernet_operations if6_proc_net_ops = { 3125 .init = if6_proc_net_init, 3126 .exit = if6_proc_net_exit, 3127 }; 3128 3129 int __init if6_proc_init(void) 3130 { 3131 return register_pernet_subsys(&if6_proc_net_ops); 3132 } 3133 3134 void if6_proc_exit(void) 3135 { 3136 unregister_pernet_subsys(&if6_proc_net_ops); 3137 } 3138 #endif /* CONFIG_PROC_FS */ 3139 3140 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3141 /* Check if address is a home address configured on any interface. */ 3142 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3143 { 3144 int ret = 0; 3145 struct inet6_ifaddr *ifp = NULL; 3146 struct hlist_node *n; 3147 unsigned int hash = ipv6_addr_hash(addr); 3148 3149 rcu_read_lock_bh(); 3150 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3151 if (!net_eq(dev_net(ifp->idev->dev), net)) 3152 continue; 3153 if (ipv6_addr_equal(&ifp->addr, addr) && 3154 (ifp->flags & IFA_F_HOMEADDRESS)) { 3155 ret = 1; 3156 break; 3157 } 3158 } 3159 rcu_read_unlock_bh(); 3160 return ret; 3161 } 3162 #endif 3163 3164 /* 3165 * Periodic address status verification 3166 */ 3167 3168 static void addrconf_verify(unsigned long foo) 3169 { 3170 unsigned long now, next, next_sec, next_sched; 3171 struct inet6_ifaddr *ifp; 3172 struct hlist_node *node; 3173 int i; 3174 3175 rcu_read_lock_bh(); 3176 spin_lock(&addrconf_verify_lock); 3177 now = jiffies; 3178 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3179 3180 del_timer(&addr_chk_timer); 3181 3182 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3183 restart: 3184 hlist_for_each_entry_rcu_bh(ifp, node, 3185 &inet6_addr_lst[i], addr_lst) { 3186 unsigned long age; 3187 3188 if (ifp->flags & IFA_F_PERMANENT) 3189 continue; 3190 3191 spin_lock(&ifp->lock); 3192 /* We try to batch several events at once. */ 3193 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3194 3195 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3196 age >= ifp->valid_lft) { 3197 spin_unlock(&ifp->lock); 3198 in6_ifa_hold(ifp); 3199 ipv6_del_addr(ifp); 3200 goto restart; 3201 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3202 spin_unlock(&ifp->lock); 3203 continue; 3204 } else if (age >= ifp->prefered_lft) { 3205 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3206 int deprecate = 0; 3207 3208 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3209 deprecate = 1; 3210 ifp->flags |= IFA_F_DEPRECATED; 3211 } 3212 3213 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3214 next = ifp->tstamp + ifp->valid_lft * HZ; 3215 3216 spin_unlock(&ifp->lock); 3217 3218 if (deprecate) { 3219 in6_ifa_hold(ifp); 3220 3221 ipv6_ifa_notify(0, ifp); 3222 in6_ifa_put(ifp); 3223 goto restart; 3224 } 3225 #ifdef CONFIG_IPV6_PRIVACY 3226 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3227 !(ifp->flags&IFA_F_TENTATIVE)) { 3228 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3229 ifp->idev->cnf.dad_transmits * 3230 ifp->idev->nd_parms->retrans_time / HZ; 3231 3232 if (age >= ifp->prefered_lft - regen_advance) { 3233 struct inet6_ifaddr *ifpub = ifp->ifpub; 3234 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3235 next = ifp->tstamp + ifp->prefered_lft * HZ; 3236 if (!ifp->regen_count && ifpub) { 3237 ifp->regen_count++; 3238 in6_ifa_hold(ifp); 3239 in6_ifa_hold(ifpub); 3240 spin_unlock(&ifp->lock); 3241 3242 spin_lock(&ifpub->lock); 3243 ifpub->regen_count = 0; 3244 spin_unlock(&ifpub->lock); 3245 ipv6_create_tempaddr(ifpub, ifp); 3246 in6_ifa_put(ifpub); 3247 in6_ifa_put(ifp); 3248 goto restart; 3249 } 3250 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3251 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3252 spin_unlock(&ifp->lock); 3253 #endif 3254 } else { 3255 /* ifp->prefered_lft <= ifp->valid_lft */ 3256 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3257 next = ifp->tstamp + ifp->prefered_lft * HZ; 3258 spin_unlock(&ifp->lock); 3259 } 3260 } 3261 } 3262 3263 next_sec = round_jiffies_up(next); 3264 next_sched = next; 3265 3266 /* If rounded timeout is accurate enough, accept it. */ 3267 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3268 next_sched = next_sec; 3269 3270 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3271 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3272 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3273 3274 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3275 now, next, next_sec, next_sched)); 3276 3277 addr_chk_timer.expires = next_sched; 3278 add_timer(&addr_chk_timer); 3279 spin_unlock(&addrconf_verify_lock); 3280 rcu_read_unlock_bh(); 3281 } 3282 3283 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3284 { 3285 struct in6_addr *pfx = NULL; 3286 3287 if (addr) 3288 pfx = nla_data(addr); 3289 3290 if (local) { 3291 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3292 pfx = NULL; 3293 else 3294 pfx = nla_data(local); 3295 } 3296 3297 return pfx; 3298 } 3299 3300 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3301 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3302 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3303 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3304 }; 3305 3306 static int 3307 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3308 { 3309 struct net *net = sock_net(skb->sk); 3310 struct ifaddrmsg *ifm; 3311 struct nlattr *tb[IFA_MAX+1]; 3312 struct in6_addr *pfx; 3313 int err; 3314 3315 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3316 if (err < 0) 3317 return err; 3318 3319 ifm = nlmsg_data(nlh); 3320 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3321 if (pfx == NULL) 3322 return -EINVAL; 3323 3324 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3325 } 3326 3327 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3328 u32 prefered_lft, u32 valid_lft) 3329 { 3330 u32 flags; 3331 clock_t expires; 3332 unsigned long timeout; 3333 3334 if (!valid_lft || (prefered_lft > valid_lft)) 3335 return -EINVAL; 3336 3337 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3338 if (addrconf_finite_timeout(timeout)) { 3339 expires = jiffies_to_clock_t(timeout * HZ); 3340 valid_lft = timeout; 3341 flags = RTF_EXPIRES; 3342 } else { 3343 expires = 0; 3344 flags = 0; 3345 ifa_flags |= IFA_F_PERMANENT; 3346 } 3347 3348 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3349 if (addrconf_finite_timeout(timeout)) { 3350 if (timeout == 0) 3351 ifa_flags |= IFA_F_DEPRECATED; 3352 prefered_lft = timeout; 3353 } 3354 3355 spin_lock_bh(&ifp->lock); 3356 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3357 ifp->tstamp = jiffies; 3358 ifp->valid_lft = valid_lft; 3359 ifp->prefered_lft = prefered_lft; 3360 3361 spin_unlock_bh(&ifp->lock); 3362 if (!(ifp->flags&IFA_F_TENTATIVE)) 3363 ipv6_ifa_notify(0, ifp); 3364 3365 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3366 expires, flags); 3367 addrconf_verify(0); 3368 3369 return 0; 3370 } 3371 3372 static int 3373 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3374 { 3375 struct net *net = sock_net(skb->sk); 3376 struct ifaddrmsg *ifm; 3377 struct nlattr *tb[IFA_MAX+1]; 3378 struct in6_addr *pfx; 3379 struct inet6_ifaddr *ifa; 3380 struct net_device *dev; 3381 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3382 u8 ifa_flags; 3383 int err; 3384 3385 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3386 if (err < 0) 3387 return err; 3388 3389 ifm = nlmsg_data(nlh); 3390 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3391 if (pfx == NULL) 3392 return -EINVAL; 3393 3394 if (tb[IFA_CACHEINFO]) { 3395 struct ifa_cacheinfo *ci; 3396 3397 ci = nla_data(tb[IFA_CACHEINFO]); 3398 valid_lft = ci->ifa_valid; 3399 preferred_lft = ci->ifa_prefered; 3400 } else { 3401 preferred_lft = INFINITY_LIFE_TIME; 3402 valid_lft = INFINITY_LIFE_TIME; 3403 } 3404 3405 dev = __dev_get_by_index(net, ifm->ifa_index); 3406 if (dev == NULL) 3407 return -ENODEV; 3408 3409 /* We ignore other flags so far. */ 3410 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3411 3412 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3413 if (ifa == NULL) { 3414 /* 3415 * It would be best to check for !NLM_F_CREATE here but 3416 * userspace alreay relies on not having to provide this. 3417 */ 3418 return inet6_addr_add(net, ifm->ifa_index, pfx, 3419 ifm->ifa_prefixlen, ifa_flags, 3420 preferred_lft, valid_lft); 3421 } 3422 3423 if (nlh->nlmsg_flags & NLM_F_EXCL || 3424 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3425 err = -EEXIST; 3426 else 3427 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3428 3429 in6_ifa_put(ifa); 3430 3431 return err; 3432 } 3433 3434 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3435 u8 scope, int ifindex) 3436 { 3437 struct ifaddrmsg *ifm; 3438 3439 ifm = nlmsg_data(nlh); 3440 ifm->ifa_family = AF_INET6; 3441 ifm->ifa_prefixlen = prefixlen; 3442 ifm->ifa_flags = flags; 3443 ifm->ifa_scope = scope; 3444 ifm->ifa_index = ifindex; 3445 } 3446 3447 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3448 unsigned long tstamp, u32 preferred, u32 valid) 3449 { 3450 struct ifa_cacheinfo ci; 3451 3452 ci.cstamp = cstamp_delta(cstamp); 3453 ci.tstamp = cstamp_delta(tstamp); 3454 ci.ifa_prefered = preferred; 3455 ci.ifa_valid = valid; 3456 3457 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3458 } 3459 3460 static inline int rt_scope(int ifa_scope) 3461 { 3462 if (ifa_scope & IFA_HOST) 3463 return RT_SCOPE_HOST; 3464 else if (ifa_scope & IFA_LINK) 3465 return RT_SCOPE_LINK; 3466 else if (ifa_scope & IFA_SITE) 3467 return RT_SCOPE_SITE; 3468 else 3469 return RT_SCOPE_UNIVERSE; 3470 } 3471 3472 static inline int inet6_ifaddr_msgsize(void) 3473 { 3474 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3475 + nla_total_size(16) /* IFA_ADDRESS */ 3476 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3477 } 3478 3479 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3480 u32 pid, u32 seq, int event, unsigned int flags) 3481 { 3482 struct nlmsghdr *nlh; 3483 u32 preferred, valid; 3484 3485 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3486 if (nlh == NULL) 3487 return -EMSGSIZE; 3488 3489 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3490 ifa->idev->dev->ifindex); 3491 3492 if (!(ifa->flags&IFA_F_PERMANENT)) { 3493 preferred = ifa->prefered_lft; 3494 valid = ifa->valid_lft; 3495 if (preferred != INFINITY_LIFE_TIME) { 3496 long tval = (jiffies - ifa->tstamp)/HZ; 3497 if (preferred > tval) 3498 preferred -= tval; 3499 else 3500 preferred = 0; 3501 if (valid != INFINITY_LIFE_TIME) { 3502 if (valid > tval) 3503 valid -= tval; 3504 else 3505 valid = 0; 3506 } 3507 } 3508 } else { 3509 preferred = INFINITY_LIFE_TIME; 3510 valid = INFINITY_LIFE_TIME; 3511 } 3512 3513 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3514 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3515 nlmsg_cancel(skb, nlh); 3516 return -EMSGSIZE; 3517 } 3518 3519 return nlmsg_end(skb, nlh); 3520 } 3521 3522 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3523 u32 pid, u32 seq, int event, u16 flags) 3524 { 3525 struct nlmsghdr *nlh; 3526 u8 scope = RT_SCOPE_UNIVERSE; 3527 int ifindex = ifmca->idev->dev->ifindex; 3528 3529 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3530 scope = RT_SCOPE_SITE; 3531 3532 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3533 if (nlh == NULL) 3534 return -EMSGSIZE; 3535 3536 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3537 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3538 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3539 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3540 nlmsg_cancel(skb, nlh); 3541 return -EMSGSIZE; 3542 } 3543 3544 return nlmsg_end(skb, nlh); 3545 } 3546 3547 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3548 u32 pid, u32 seq, int event, unsigned int flags) 3549 { 3550 struct nlmsghdr *nlh; 3551 u8 scope = RT_SCOPE_UNIVERSE; 3552 int ifindex = ifaca->aca_idev->dev->ifindex; 3553 3554 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3555 scope = RT_SCOPE_SITE; 3556 3557 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3558 if (nlh == NULL) 3559 return -EMSGSIZE; 3560 3561 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3562 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3563 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3564 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3565 nlmsg_cancel(skb, nlh); 3566 return -EMSGSIZE; 3567 } 3568 3569 return nlmsg_end(skb, nlh); 3570 } 3571 3572 enum addr_type_t { 3573 UNICAST_ADDR, 3574 MULTICAST_ADDR, 3575 ANYCAST_ADDR, 3576 }; 3577 3578 /* called with rcu_read_lock() */ 3579 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3580 struct netlink_callback *cb, enum addr_type_t type, 3581 int s_ip_idx, int *p_ip_idx) 3582 { 3583 struct ifmcaddr6 *ifmca; 3584 struct ifacaddr6 *ifaca; 3585 int err = 1; 3586 int ip_idx = *p_ip_idx; 3587 3588 read_lock_bh(&idev->lock); 3589 switch (type) { 3590 case UNICAST_ADDR: { 3591 struct inet6_ifaddr *ifa; 3592 3593 /* unicast address incl. temp addr */ 3594 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3595 if (++ip_idx < s_ip_idx) 3596 continue; 3597 err = inet6_fill_ifaddr(skb, ifa, 3598 NETLINK_CB(cb->skb).pid, 3599 cb->nlh->nlmsg_seq, 3600 RTM_NEWADDR, 3601 NLM_F_MULTI); 3602 if (err <= 0) 3603 break; 3604 } 3605 break; 3606 } 3607 case MULTICAST_ADDR: 3608 /* multicast address */ 3609 for (ifmca = idev->mc_list; ifmca; 3610 ifmca = ifmca->next, ip_idx++) { 3611 if (ip_idx < s_ip_idx) 3612 continue; 3613 err = inet6_fill_ifmcaddr(skb, ifmca, 3614 NETLINK_CB(cb->skb).pid, 3615 cb->nlh->nlmsg_seq, 3616 RTM_GETMULTICAST, 3617 NLM_F_MULTI); 3618 if (err <= 0) 3619 break; 3620 } 3621 break; 3622 case ANYCAST_ADDR: 3623 /* anycast address */ 3624 for (ifaca = idev->ac_list; ifaca; 3625 ifaca = ifaca->aca_next, ip_idx++) { 3626 if (ip_idx < s_ip_idx) 3627 continue; 3628 err = inet6_fill_ifacaddr(skb, ifaca, 3629 NETLINK_CB(cb->skb).pid, 3630 cb->nlh->nlmsg_seq, 3631 RTM_GETANYCAST, 3632 NLM_F_MULTI); 3633 if (err <= 0) 3634 break; 3635 } 3636 break; 3637 default: 3638 break; 3639 } 3640 read_unlock_bh(&idev->lock); 3641 *p_ip_idx = ip_idx; 3642 return err; 3643 } 3644 3645 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3646 enum addr_type_t type) 3647 { 3648 struct net *net = sock_net(skb->sk); 3649 int h, s_h; 3650 int idx, ip_idx; 3651 int s_idx, s_ip_idx; 3652 struct net_device *dev; 3653 struct inet6_dev *idev; 3654 struct hlist_head *head; 3655 struct hlist_node *node; 3656 3657 s_h = cb->args[0]; 3658 s_idx = idx = cb->args[1]; 3659 s_ip_idx = ip_idx = cb->args[2]; 3660 3661 rcu_read_lock(); 3662 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3663 idx = 0; 3664 head = &net->dev_index_head[h]; 3665 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3666 if (idx < s_idx) 3667 goto cont; 3668 if (h > s_h || idx > s_idx) 3669 s_ip_idx = 0; 3670 ip_idx = 0; 3671 idev = __in6_dev_get(dev); 3672 if (!idev) 3673 goto cont; 3674 3675 if (in6_dump_addrs(idev, skb, cb, type, 3676 s_ip_idx, &ip_idx) <= 0) 3677 goto done; 3678 cont: 3679 idx++; 3680 } 3681 } 3682 done: 3683 rcu_read_unlock(); 3684 cb->args[0] = h; 3685 cb->args[1] = idx; 3686 cb->args[2] = ip_idx; 3687 3688 return skb->len; 3689 } 3690 3691 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3692 { 3693 enum addr_type_t type = UNICAST_ADDR; 3694 3695 return inet6_dump_addr(skb, cb, type); 3696 } 3697 3698 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3699 { 3700 enum addr_type_t type = MULTICAST_ADDR; 3701 3702 return inet6_dump_addr(skb, cb, type); 3703 } 3704 3705 3706 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3707 { 3708 enum addr_type_t type = ANYCAST_ADDR; 3709 3710 return inet6_dump_addr(skb, cb, type); 3711 } 3712 3713 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3714 void *arg) 3715 { 3716 struct net *net = sock_net(in_skb->sk); 3717 struct ifaddrmsg *ifm; 3718 struct nlattr *tb[IFA_MAX+1]; 3719 struct in6_addr *addr = NULL; 3720 struct net_device *dev = NULL; 3721 struct inet6_ifaddr *ifa; 3722 struct sk_buff *skb; 3723 int err; 3724 3725 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3726 if (err < 0) 3727 goto errout; 3728 3729 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3730 if (addr == NULL) { 3731 err = -EINVAL; 3732 goto errout; 3733 } 3734 3735 ifm = nlmsg_data(nlh); 3736 if (ifm->ifa_index) 3737 dev = __dev_get_by_index(net, ifm->ifa_index); 3738 3739 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3740 if (!ifa) { 3741 err = -EADDRNOTAVAIL; 3742 goto errout; 3743 } 3744 3745 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3746 if (!skb) { 3747 err = -ENOBUFS; 3748 goto errout_ifa; 3749 } 3750 3751 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3752 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3753 if (err < 0) { 3754 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3755 WARN_ON(err == -EMSGSIZE); 3756 kfree_skb(skb); 3757 goto errout_ifa; 3758 } 3759 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3760 errout_ifa: 3761 in6_ifa_put(ifa); 3762 errout: 3763 return err; 3764 } 3765 3766 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3767 { 3768 struct sk_buff *skb; 3769 struct net *net = dev_net(ifa->idev->dev); 3770 int err = -ENOBUFS; 3771 3772 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3773 if (skb == NULL) 3774 goto errout; 3775 3776 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3777 if (err < 0) { 3778 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3779 WARN_ON(err == -EMSGSIZE); 3780 kfree_skb(skb); 3781 goto errout; 3782 } 3783 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3784 return; 3785 errout: 3786 if (err < 0) 3787 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3788 } 3789 3790 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3791 __s32 *array, int bytes) 3792 { 3793 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3794 3795 memset(array, 0, bytes); 3796 array[DEVCONF_FORWARDING] = cnf->forwarding; 3797 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3798 array[DEVCONF_MTU6] = cnf->mtu6; 3799 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3800 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3801 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3802 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3803 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3804 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3805 jiffies_to_msecs(cnf->rtr_solicit_interval); 3806 array[DEVCONF_RTR_SOLICIT_DELAY] = 3807 jiffies_to_msecs(cnf->rtr_solicit_delay); 3808 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3809 #ifdef CONFIG_IPV6_PRIVACY 3810 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3811 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3812 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3813 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3814 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3815 #endif 3816 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3817 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3818 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3819 #ifdef CONFIG_IPV6_ROUTER_PREF 3820 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3821 array[DEVCONF_RTR_PROBE_INTERVAL] = 3822 jiffies_to_msecs(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_ifla6_size(void) 3841 { 3842 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3843 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3844 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3845 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3846 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3847 } 3848 3849 static inline size_t inet6_if_nlmsg_size(void) 3850 { 3851 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3852 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3853 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3854 + nla_total_size(4) /* IFLA_MTU */ 3855 + nla_total_size(4) /* IFLA_LINK */ 3856 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3857 } 3858 3859 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib, 3860 int items, int bytes) 3861 { 3862 int i; 3863 int pad = bytes - sizeof(u64) * items; 3864 BUG_ON(pad < 0); 3865 3866 /* Use put_unaligned() because stats may not be aligned for u64. */ 3867 put_unaligned(items, &stats[0]); 3868 for (i = 1; i < items; i++) 3869 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3870 3871 memset(&stats[items], 0, pad); 3872 } 3873 3874 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3875 int items, int bytes, size_t syncpoff) 3876 { 3877 int i; 3878 int pad = bytes - sizeof(u64) * items; 3879 BUG_ON(pad < 0); 3880 3881 /* Use put_unaligned() because stats may not be aligned for u64. */ 3882 put_unaligned(items, &stats[0]); 3883 for (i = 1; i < items; i++) 3884 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3885 3886 memset(&stats[items], 0, pad); 3887 } 3888 3889 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3890 int bytes) 3891 { 3892 switch (attrtype) { 3893 case IFLA_INET6_STATS: 3894 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3895 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3896 break; 3897 case IFLA_INET6_ICMP6STATS: 3898 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3899 break; 3900 } 3901 } 3902 3903 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3904 { 3905 struct nlattr *nla; 3906 struct ifla_cacheinfo ci; 3907 3908 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3909 3910 ci.max_reasm_len = IPV6_MAXPLEN; 3911 ci.tstamp = cstamp_delta(idev->tstamp); 3912 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3913 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3914 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3915 3916 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3917 if (nla == NULL) 3918 goto nla_put_failure; 3919 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3920 3921 /* XXX - MC not implemented */ 3922 3923 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3924 if (nla == NULL) 3925 goto nla_put_failure; 3926 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3927 3928 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3929 if (nla == NULL) 3930 goto nla_put_failure; 3931 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3932 3933 return 0; 3934 3935 nla_put_failure: 3936 return -EMSGSIZE; 3937 } 3938 3939 static size_t inet6_get_link_af_size(const struct net_device *dev) 3940 { 3941 if (!__in6_dev_get(dev)) 3942 return 0; 3943 3944 return inet6_ifla6_size(); 3945 } 3946 3947 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 3948 { 3949 struct inet6_dev *idev = __in6_dev_get(dev); 3950 3951 if (!idev) 3952 return -ENODATA; 3953 3954 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 3955 return -EMSGSIZE; 3956 3957 return 0; 3958 } 3959 3960 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3961 u32 pid, u32 seq, int event, unsigned int flags) 3962 { 3963 struct net_device *dev = idev->dev; 3964 struct ifinfomsg *hdr; 3965 struct nlmsghdr *nlh; 3966 void *protoinfo; 3967 3968 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3969 if (nlh == NULL) 3970 return -EMSGSIZE; 3971 3972 hdr = nlmsg_data(nlh); 3973 hdr->ifi_family = AF_INET6; 3974 hdr->__ifi_pad = 0; 3975 hdr->ifi_type = dev->type; 3976 hdr->ifi_index = dev->ifindex; 3977 hdr->ifi_flags = dev_get_flags(dev); 3978 hdr->ifi_change = 0; 3979 3980 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3981 3982 if (dev->addr_len) 3983 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3984 3985 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3986 if (dev->ifindex != dev->iflink) 3987 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3988 3989 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3990 if (protoinfo == NULL) 3991 goto nla_put_failure; 3992 3993 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 3994 goto nla_put_failure; 3995 3996 nla_nest_end(skb, protoinfo); 3997 return nlmsg_end(skb, nlh); 3998 3999 nla_put_failure: 4000 nlmsg_cancel(skb, nlh); 4001 return -EMSGSIZE; 4002 } 4003 4004 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4005 { 4006 struct net *net = sock_net(skb->sk); 4007 int h, s_h; 4008 int idx = 0, s_idx; 4009 struct net_device *dev; 4010 struct inet6_dev *idev; 4011 struct hlist_head *head; 4012 struct hlist_node *node; 4013 4014 s_h = cb->args[0]; 4015 s_idx = cb->args[1]; 4016 4017 rcu_read_lock(); 4018 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4019 idx = 0; 4020 head = &net->dev_index_head[h]; 4021 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4022 if (idx < s_idx) 4023 goto cont; 4024 idev = __in6_dev_get(dev); 4025 if (!idev) 4026 goto cont; 4027 if (inet6_fill_ifinfo(skb, idev, 4028 NETLINK_CB(cb->skb).pid, 4029 cb->nlh->nlmsg_seq, 4030 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4031 goto out; 4032 cont: 4033 idx++; 4034 } 4035 } 4036 out: 4037 rcu_read_unlock(); 4038 cb->args[1] = idx; 4039 cb->args[0] = h; 4040 4041 return skb->len; 4042 } 4043 4044 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4045 { 4046 struct sk_buff *skb; 4047 struct net *net = dev_net(idev->dev); 4048 int err = -ENOBUFS; 4049 4050 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4051 if (skb == NULL) 4052 goto errout; 4053 4054 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4055 if (err < 0) { 4056 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4057 WARN_ON(err == -EMSGSIZE); 4058 kfree_skb(skb); 4059 goto errout; 4060 } 4061 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4062 return; 4063 errout: 4064 if (err < 0) 4065 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4066 } 4067 4068 static inline size_t inet6_prefix_nlmsg_size(void) 4069 { 4070 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4071 + nla_total_size(sizeof(struct in6_addr)) 4072 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4073 } 4074 4075 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4076 struct prefix_info *pinfo, u32 pid, u32 seq, 4077 int event, unsigned int flags) 4078 { 4079 struct prefixmsg *pmsg; 4080 struct nlmsghdr *nlh; 4081 struct prefix_cacheinfo ci; 4082 4083 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4084 if (nlh == NULL) 4085 return -EMSGSIZE; 4086 4087 pmsg = nlmsg_data(nlh); 4088 pmsg->prefix_family = AF_INET6; 4089 pmsg->prefix_pad1 = 0; 4090 pmsg->prefix_pad2 = 0; 4091 pmsg->prefix_ifindex = idev->dev->ifindex; 4092 pmsg->prefix_len = pinfo->prefix_len; 4093 pmsg->prefix_type = pinfo->type; 4094 pmsg->prefix_pad3 = 0; 4095 pmsg->prefix_flags = 0; 4096 if (pinfo->onlink) 4097 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4098 if (pinfo->autoconf) 4099 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4100 4101 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4102 4103 ci.preferred_time = ntohl(pinfo->prefered); 4104 ci.valid_time = ntohl(pinfo->valid); 4105 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4106 4107 return nlmsg_end(skb, nlh); 4108 4109 nla_put_failure: 4110 nlmsg_cancel(skb, nlh); 4111 return -EMSGSIZE; 4112 } 4113 4114 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4115 struct prefix_info *pinfo) 4116 { 4117 struct sk_buff *skb; 4118 struct net *net = dev_net(idev->dev); 4119 int err = -ENOBUFS; 4120 4121 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4122 if (skb == NULL) 4123 goto errout; 4124 4125 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4126 if (err < 0) { 4127 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4128 WARN_ON(err == -EMSGSIZE); 4129 kfree_skb(skb); 4130 goto errout; 4131 } 4132 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4133 return; 4134 errout: 4135 if (err < 0) 4136 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4137 } 4138 4139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4140 { 4141 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4142 4143 switch (event) { 4144 case RTM_NEWADDR: 4145 /* 4146 * If the address was optimistic 4147 * we inserted the route at the start of 4148 * our DAD process, so we don't need 4149 * to do it again 4150 */ 4151 if (!(ifp->rt->rt6i_node)) 4152 ip6_ins_rt(ifp->rt); 4153 if (ifp->idev->cnf.forwarding) 4154 addrconf_join_anycast(ifp); 4155 break; 4156 case RTM_DELADDR: 4157 if (ifp->idev->cnf.forwarding) 4158 addrconf_leave_anycast(ifp); 4159 addrconf_leave_solict(ifp->idev, &ifp->addr); 4160 dst_hold(&ifp->rt->dst); 4161 4162 if (ifp->state == INET6_IFADDR_STATE_DEAD && 4163 ip6_del_rt(ifp->rt)) 4164 dst_free(&ifp->rt->dst); 4165 break; 4166 } 4167 } 4168 4169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4170 { 4171 rcu_read_lock_bh(); 4172 if (likely(ifp->idev->dead == 0)) 4173 __ipv6_ifa_notify(event, ifp); 4174 rcu_read_unlock_bh(); 4175 } 4176 4177 #ifdef CONFIG_SYSCTL 4178 4179 static 4180 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4181 void __user *buffer, size_t *lenp, loff_t *ppos) 4182 { 4183 int *valp = ctl->data; 4184 int val = *valp; 4185 loff_t pos = *ppos; 4186 int ret; 4187 4188 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4189 4190 if (write) 4191 ret = addrconf_fixup_forwarding(ctl, valp, val); 4192 if (ret) 4193 *ppos = pos; 4194 return ret; 4195 } 4196 4197 static void dev_disable_change(struct inet6_dev *idev) 4198 { 4199 if (!idev || !idev->dev) 4200 return; 4201 4202 if (idev->cnf.disable_ipv6) 4203 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4204 else 4205 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4206 } 4207 4208 static void addrconf_disable_change(struct net *net, __s32 newf) 4209 { 4210 struct net_device *dev; 4211 struct inet6_dev *idev; 4212 4213 rcu_read_lock(); 4214 for_each_netdev_rcu(net, dev) { 4215 idev = __in6_dev_get(dev); 4216 if (idev) { 4217 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4218 idev->cnf.disable_ipv6 = newf; 4219 if (changed) 4220 dev_disable_change(idev); 4221 } 4222 } 4223 rcu_read_unlock(); 4224 } 4225 4226 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4227 { 4228 struct net *net; 4229 4230 net = (struct net *)table->extra2; 4231 4232 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4233 return 0; 4234 4235 if (!rtnl_trylock()) { 4236 /* Restore the original values before restarting */ 4237 *p = old; 4238 return restart_syscall(); 4239 } 4240 4241 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4242 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4243 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4244 addrconf_disable_change(net, newf); 4245 } else if ((!*p) ^ (!old)) 4246 dev_disable_change((struct inet6_dev *)table->extra1); 4247 4248 rtnl_unlock(); 4249 return 0; 4250 } 4251 4252 static 4253 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4254 void __user *buffer, size_t *lenp, loff_t *ppos) 4255 { 4256 int *valp = ctl->data; 4257 int val = *valp; 4258 loff_t pos = *ppos; 4259 int ret; 4260 4261 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4262 4263 if (write) 4264 ret = addrconf_disable_ipv6(ctl, valp, val); 4265 if (ret) 4266 *ppos = pos; 4267 return ret; 4268 } 4269 4270 static struct addrconf_sysctl_table 4271 { 4272 struct ctl_table_header *sysctl_header; 4273 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4274 char *dev_name; 4275 } addrconf_sysctl __read_mostly = { 4276 .sysctl_header = NULL, 4277 .addrconf_vars = { 4278 { 4279 .procname = "forwarding", 4280 .data = &ipv6_devconf.forwarding, 4281 .maxlen = sizeof(int), 4282 .mode = 0644, 4283 .proc_handler = addrconf_sysctl_forward, 4284 }, 4285 { 4286 .procname = "hop_limit", 4287 .data = &ipv6_devconf.hop_limit, 4288 .maxlen = sizeof(int), 4289 .mode = 0644, 4290 .proc_handler = proc_dointvec, 4291 }, 4292 { 4293 .procname = "mtu", 4294 .data = &ipv6_devconf.mtu6, 4295 .maxlen = sizeof(int), 4296 .mode = 0644, 4297 .proc_handler = proc_dointvec, 4298 }, 4299 { 4300 .procname = "accept_ra", 4301 .data = &ipv6_devconf.accept_ra, 4302 .maxlen = sizeof(int), 4303 .mode = 0644, 4304 .proc_handler = proc_dointvec, 4305 }, 4306 { 4307 .procname = "accept_redirects", 4308 .data = &ipv6_devconf.accept_redirects, 4309 .maxlen = sizeof(int), 4310 .mode = 0644, 4311 .proc_handler = proc_dointvec, 4312 }, 4313 { 4314 .procname = "autoconf", 4315 .data = &ipv6_devconf.autoconf, 4316 .maxlen = sizeof(int), 4317 .mode = 0644, 4318 .proc_handler = proc_dointvec, 4319 }, 4320 { 4321 .procname = "dad_transmits", 4322 .data = &ipv6_devconf.dad_transmits, 4323 .maxlen = sizeof(int), 4324 .mode = 0644, 4325 .proc_handler = proc_dointvec, 4326 }, 4327 { 4328 .procname = "router_solicitations", 4329 .data = &ipv6_devconf.rtr_solicits, 4330 .maxlen = sizeof(int), 4331 .mode = 0644, 4332 .proc_handler = proc_dointvec, 4333 }, 4334 { 4335 .procname = "router_solicitation_interval", 4336 .data = &ipv6_devconf.rtr_solicit_interval, 4337 .maxlen = sizeof(int), 4338 .mode = 0644, 4339 .proc_handler = proc_dointvec_jiffies, 4340 }, 4341 { 4342 .procname = "router_solicitation_delay", 4343 .data = &ipv6_devconf.rtr_solicit_delay, 4344 .maxlen = sizeof(int), 4345 .mode = 0644, 4346 .proc_handler = proc_dointvec_jiffies, 4347 }, 4348 { 4349 .procname = "force_mld_version", 4350 .data = &ipv6_devconf.force_mld_version, 4351 .maxlen = sizeof(int), 4352 .mode = 0644, 4353 .proc_handler = proc_dointvec, 4354 }, 4355 #ifdef CONFIG_IPV6_PRIVACY 4356 { 4357 .procname = "use_tempaddr", 4358 .data = &ipv6_devconf.use_tempaddr, 4359 .maxlen = sizeof(int), 4360 .mode = 0644, 4361 .proc_handler = proc_dointvec, 4362 }, 4363 { 4364 .procname = "temp_valid_lft", 4365 .data = &ipv6_devconf.temp_valid_lft, 4366 .maxlen = sizeof(int), 4367 .mode = 0644, 4368 .proc_handler = proc_dointvec, 4369 }, 4370 { 4371 .procname = "temp_prefered_lft", 4372 .data = &ipv6_devconf.temp_prefered_lft, 4373 .maxlen = sizeof(int), 4374 .mode = 0644, 4375 .proc_handler = proc_dointvec, 4376 }, 4377 { 4378 .procname = "regen_max_retry", 4379 .data = &ipv6_devconf.regen_max_retry, 4380 .maxlen = sizeof(int), 4381 .mode = 0644, 4382 .proc_handler = proc_dointvec, 4383 }, 4384 { 4385 .procname = "max_desync_factor", 4386 .data = &ipv6_devconf.max_desync_factor, 4387 .maxlen = sizeof(int), 4388 .mode = 0644, 4389 .proc_handler = proc_dointvec, 4390 }, 4391 #endif 4392 { 4393 .procname = "max_addresses", 4394 .data = &ipv6_devconf.max_addresses, 4395 .maxlen = sizeof(int), 4396 .mode = 0644, 4397 .proc_handler = proc_dointvec, 4398 }, 4399 { 4400 .procname = "accept_ra_defrtr", 4401 .data = &ipv6_devconf.accept_ra_defrtr, 4402 .maxlen = sizeof(int), 4403 .mode = 0644, 4404 .proc_handler = proc_dointvec, 4405 }, 4406 { 4407 .procname = "accept_ra_pinfo", 4408 .data = &ipv6_devconf.accept_ra_pinfo, 4409 .maxlen = sizeof(int), 4410 .mode = 0644, 4411 .proc_handler = proc_dointvec, 4412 }, 4413 #ifdef CONFIG_IPV6_ROUTER_PREF 4414 { 4415 .procname = "accept_ra_rtr_pref", 4416 .data = &ipv6_devconf.accept_ra_rtr_pref, 4417 .maxlen = sizeof(int), 4418 .mode = 0644, 4419 .proc_handler = proc_dointvec, 4420 }, 4421 { 4422 .procname = "router_probe_interval", 4423 .data = &ipv6_devconf.rtr_probe_interval, 4424 .maxlen = sizeof(int), 4425 .mode = 0644, 4426 .proc_handler = proc_dointvec_jiffies, 4427 }, 4428 #ifdef CONFIG_IPV6_ROUTE_INFO 4429 { 4430 .procname = "accept_ra_rt_info_max_plen", 4431 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4432 .maxlen = sizeof(int), 4433 .mode = 0644, 4434 .proc_handler = proc_dointvec, 4435 }, 4436 #endif 4437 #endif 4438 { 4439 .procname = "proxy_ndp", 4440 .data = &ipv6_devconf.proxy_ndp, 4441 .maxlen = sizeof(int), 4442 .mode = 0644, 4443 .proc_handler = proc_dointvec, 4444 }, 4445 { 4446 .procname = "accept_source_route", 4447 .data = &ipv6_devconf.accept_source_route, 4448 .maxlen = sizeof(int), 4449 .mode = 0644, 4450 .proc_handler = proc_dointvec, 4451 }, 4452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4453 { 4454 .procname = "optimistic_dad", 4455 .data = &ipv6_devconf.optimistic_dad, 4456 .maxlen = sizeof(int), 4457 .mode = 0644, 4458 .proc_handler = proc_dointvec, 4459 4460 }, 4461 #endif 4462 #ifdef CONFIG_IPV6_MROUTE 4463 { 4464 .procname = "mc_forwarding", 4465 .data = &ipv6_devconf.mc_forwarding, 4466 .maxlen = sizeof(int), 4467 .mode = 0444, 4468 .proc_handler = proc_dointvec, 4469 }, 4470 #endif 4471 { 4472 .procname = "disable_ipv6", 4473 .data = &ipv6_devconf.disable_ipv6, 4474 .maxlen = sizeof(int), 4475 .mode = 0644, 4476 .proc_handler = addrconf_sysctl_disable, 4477 }, 4478 { 4479 .procname = "accept_dad", 4480 .data = &ipv6_devconf.accept_dad, 4481 .maxlen = sizeof(int), 4482 .mode = 0644, 4483 .proc_handler = proc_dointvec, 4484 }, 4485 { 4486 .procname = "force_tllao", 4487 .data = &ipv6_devconf.force_tllao, 4488 .maxlen = sizeof(int), 4489 .mode = 0644, 4490 .proc_handler = proc_dointvec 4491 }, 4492 { 4493 /* sentinel */ 4494 } 4495 }, 4496 }; 4497 4498 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4499 struct inet6_dev *idev, struct ipv6_devconf *p) 4500 { 4501 int i; 4502 struct addrconf_sysctl_table *t; 4503 4504 #define ADDRCONF_CTL_PATH_DEV 3 4505 4506 struct ctl_path addrconf_ctl_path[] = { 4507 { .procname = "net", }, 4508 { .procname = "ipv6", }, 4509 { .procname = "conf", }, 4510 { /* to be set */ }, 4511 { }, 4512 }; 4513 4514 4515 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4516 if (t == NULL) 4517 goto out; 4518 4519 for (i = 0; t->addrconf_vars[i].data; i++) { 4520 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4521 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4522 t->addrconf_vars[i].extra2 = net; 4523 } 4524 4525 /* 4526 * Make a copy of dev_name, because '.procname' is regarded as const 4527 * by sysctl and we wouldn't want anyone to change it under our feet 4528 * (see SIOCSIFNAME). 4529 */ 4530 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4531 if (!t->dev_name) 4532 goto free; 4533 4534 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4535 4536 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4537 t->addrconf_vars); 4538 if (t->sysctl_header == NULL) 4539 goto free_procname; 4540 4541 p->sysctl = t; 4542 return 0; 4543 4544 free_procname: 4545 kfree(t->dev_name); 4546 free: 4547 kfree(t); 4548 out: 4549 return -ENOBUFS; 4550 } 4551 4552 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4553 { 4554 struct addrconf_sysctl_table *t; 4555 4556 if (p->sysctl == NULL) 4557 return; 4558 4559 t = p->sysctl; 4560 p->sysctl = NULL; 4561 unregister_sysctl_table(t->sysctl_header); 4562 kfree(t->dev_name); 4563 kfree(t); 4564 } 4565 4566 static void addrconf_sysctl_register(struct inet6_dev *idev) 4567 { 4568 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4569 &ndisc_ifinfo_sysctl_change); 4570 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4571 idev, &idev->cnf); 4572 } 4573 4574 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4575 { 4576 __addrconf_sysctl_unregister(&idev->cnf); 4577 neigh_sysctl_unregister(idev->nd_parms); 4578 } 4579 4580 4581 #endif 4582 4583 static int __net_init addrconf_init_net(struct net *net) 4584 { 4585 int err; 4586 struct ipv6_devconf *all, *dflt; 4587 4588 err = -ENOMEM; 4589 all = &ipv6_devconf; 4590 dflt = &ipv6_devconf_dflt; 4591 4592 if (!net_eq(net, &init_net)) { 4593 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4594 if (all == NULL) 4595 goto err_alloc_all; 4596 4597 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4598 if (dflt == NULL) 4599 goto err_alloc_dflt; 4600 } else { 4601 /* these will be inherited by all namespaces */ 4602 dflt->autoconf = ipv6_defaults.autoconf; 4603 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4604 } 4605 4606 net->ipv6.devconf_all = all; 4607 net->ipv6.devconf_dflt = dflt; 4608 4609 #ifdef CONFIG_SYSCTL 4610 err = __addrconf_sysctl_register(net, "all", NULL, all); 4611 if (err < 0) 4612 goto err_reg_all; 4613 4614 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4615 if (err < 0) 4616 goto err_reg_dflt; 4617 #endif 4618 return 0; 4619 4620 #ifdef CONFIG_SYSCTL 4621 err_reg_dflt: 4622 __addrconf_sysctl_unregister(all); 4623 err_reg_all: 4624 kfree(dflt); 4625 #endif 4626 err_alloc_dflt: 4627 kfree(all); 4628 err_alloc_all: 4629 return err; 4630 } 4631 4632 static void __net_exit addrconf_exit_net(struct net *net) 4633 { 4634 #ifdef CONFIG_SYSCTL 4635 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4636 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4637 #endif 4638 if (!net_eq(net, &init_net)) { 4639 kfree(net->ipv6.devconf_dflt); 4640 kfree(net->ipv6.devconf_all); 4641 } 4642 } 4643 4644 static struct pernet_operations addrconf_ops = { 4645 .init = addrconf_init_net, 4646 .exit = addrconf_exit_net, 4647 }; 4648 4649 /* 4650 * Device notifier 4651 */ 4652 4653 int register_inet6addr_notifier(struct notifier_block *nb) 4654 { 4655 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4656 } 4657 EXPORT_SYMBOL(register_inet6addr_notifier); 4658 4659 int unregister_inet6addr_notifier(struct notifier_block *nb) 4660 { 4661 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4662 } 4663 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4664 4665 static struct rtnl_af_ops inet6_ops = { 4666 .family = AF_INET6, 4667 .fill_link_af = inet6_fill_link_af, 4668 .get_link_af_size = inet6_get_link_af_size, 4669 }; 4670 4671 /* 4672 * Init / cleanup code 4673 */ 4674 4675 int __init addrconf_init(void) 4676 { 4677 int i, err; 4678 4679 err = ipv6_addr_label_init(); 4680 if (err < 0) { 4681 printk(KERN_CRIT "IPv6 Addrconf:" 4682 " cannot initialize default policy table: %d.\n", err); 4683 goto out; 4684 } 4685 4686 err = register_pernet_subsys(&addrconf_ops); 4687 if (err < 0) 4688 goto out_addrlabel; 4689 4690 /* The addrconf netdev notifier requires that loopback_dev 4691 * has it's ipv6 private information allocated and setup 4692 * before it can bring up and give link-local addresses 4693 * to other devices which are up. 4694 * 4695 * Unfortunately, loopback_dev is not necessarily the first 4696 * entry in the global dev_base list of net devices. In fact, 4697 * it is likely to be the very last entry on that list. 4698 * So this causes the notifier registry below to try and 4699 * give link-local addresses to all devices besides loopback_dev 4700 * first, then loopback_dev, which cases all the non-loopback_dev 4701 * devices to fail to get a link-local address. 4702 * 4703 * So, as a temporary fix, allocate the ipv6 structure for 4704 * loopback_dev first by hand. 4705 * Longer term, all of the dependencies ipv6 has upon the loopback 4706 * device and it being up should be removed. 4707 */ 4708 rtnl_lock(); 4709 if (!ipv6_add_dev(init_net.loopback_dev)) 4710 err = -ENOMEM; 4711 rtnl_unlock(); 4712 if (err) 4713 goto errlo; 4714 4715 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4716 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4717 4718 register_netdevice_notifier(&ipv6_dev_notf); 4719 4720 addrconf_verify(0); 4721 4722 err = rtnl_af_register(&inet6_ops); 4723 if (err < 0) 4724 goto errout_af; 4725 4726 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4727 if (err < 0) 4728 goto errout; 4729 4730 /* Only the first call to __rtnl_register can fail */ 4731 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4732 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4733 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4734 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4735 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4736 4737 ipv6_addr_label_rtnl_register(); 4738 4739 return 0; 4740 errout: 4741 rtnl_af_unregister(&inet6_ops); 4742 errout_af: 4743 unregister_netdevice_notifier(&ipv6_dev_notf); 4744 errlo: 4745 unregister_pernet_subsys(&addrconf_ops); 4746 out_addrlabel: 4747 ipv6_addr_label_cleanup(); 4748 out: 4749 return err; 4750 } 4751 4752 void addrconf_cleanup(void) 4753 { 4754 struct net_device *dev; 4755 int i; 4756 4757 unregister_netdevice_notifier(&ipv6_dev_notf); 4758 unregister_pernet_subsys(&addrconf_ops); 4759 ipv6_addr_label_cleanup(); 4760 4761 rtnl_lock(); 4762 4763 __rtnl_af_unregister(&inet6_ops); 4764 4765 /* clean dev list */ 4766 for_each_netdev(&init_net, dev) { 4767 if (__in6_dev_get(dev) == NULL) 4768 continue; 4769 addrconf_ifdown(dev, 1); 4770 } 4771 addrconf_ifdown(init_net.loopback_dev, 2); 4772 4773 /* 4774 * Check hash table. 4775 */ 4776 spin_lock_bh(&addrconf_hash_lock); 4777 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4778 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4779 spin_unlock_bh(&addrconf_hash_lock); 4780 4781 del_timer(&addr_chk_timer); 4782 rtnl_unlock(); 4783 } 4784