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 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/in6.h> 50 #include <linux/netdevice.h> 51 #include <linux/if_addr.h> 52 #include <linux/if_arp.h> 53 #include <linux/if_arcnet.h> 54 #include <linux/if_infiniband.h> 55 #include <linux/route.h> 56 #include <linux/inetdevice.h> 57 #include <linux/init.h> 58 #include <linux/slab.h> 59 #ifdef CONFIG_SYSCTL 60 #include <linux/sysctl.h> 61 #endif 62 #include <linux/capability.h> 63 #include <linux/delay.h> 64 #include <linux/notifier.h> 65 #include <linux/string.h> 66 67 #include <net/net_namespace.h> 68 #include <net/sock.h> 69 #include <net/snmp.h> 70 71 #include <net/af_ieee802154.h> 72 #include <net/ipv6.h> 73 #include <net/protocol.h> 74 #include <net/ndisc.h> 75 #include <net/ip6_route.h> 76 #include <net/addrconf.h> 77 #include <net/tcp.h> 78 #include <net/ip.h> 79 #include <net/netlink.h> 80 #include <net/pkt_sched.h> 81 #include <linux/if_tunnel.h> 82 #include <linux/rtnetlink.h> 83 84 #ifdef CONFIG_IPV6_PRIVACY 85 #include <linux/random.h> 86 #endif 87 88 #include <linux/uaccess.h> 89 #include <asm/unaligned.h> 90 91 #include <linux/proc_fs.h> 92 #include <linux/seq_file.h> 93 #include <linux/export.h> 94 95 /* Set to 3 to get tracing... */ 96 #define ACONF_DEBUG 2 97 98 #if ACONF_DEBUG >= 3 99 #define ADBG(x) printk x 100 #else 101 #define ADBG(x) 102 #endif 103 104 #define INFINITY_LIFE_TIME 0xFFFFFFFF 105 106 static inline u32 cstamp_delta(unsigned long cstamp) 107 { 108 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 109 } 110 111 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 112 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 113 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 114 115 #ifdef CONFIG_SYSCTL 116 static void addrconf_sysctl_register(struct inet6_dev *idev); 117 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 118 #else 119 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 120 { 121 } 122 123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 124 { 125 } 126 #endif 127 128 #ifdef CONFIG_IPV6_PRIVACY 129 static int __ipv6_regen_rndid(struct inet6_dev *idev); 130 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 131 static void ipv6_regen_rndid(unsigned long data); 132 #endif 133 134 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 135 static int ipv6_count_addresses(struct inet6_dev *idev); 136 137 /* 138 * Configured unicast address hash table 139 */ 140 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 141 static DEFINE_SPINLOCK(addrconf_hash_lock); 142 143 static void addrconf_verify(unsigned long); 144 145 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 146 static DEFINE_SPINLOCK(addrconf_verify_lock); 147 148 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 149 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 150 151 static void addrconf_type_change(struct net_device *dev, 152 unsigned long event); 153 static int addrconf_ifdown(struct net_device *dev, int how); 154 155 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 156 static void addrconf_dad_timer(unsigned long data); 157 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 158 static void addrconf_dad_run(struct inet6_dev *idev); 159 static void addrconf_rs_timer(unsigned long data); 160 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 161 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 162 163 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 164 struct prefix_info *pinfo); 165 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 166 struct net_device *dev); 167 168 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 169 170 static struct ipv6_devconf ipv6_devconf __read_mostly = { 171 .forwarding = 0, 172 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 173 .mtu6 = IPV6_MIN_MTU, 174 .accept_ra = 1, 175 .accept_redirects = 1, 176 .autoconf = 1, 177 .force_mld_version = 0, 178 .dad_transmits = 1, 179 .rtr_solicits = MAX_RTR_SOLICITATIONS, 180 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 181 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 182 #ifdef CONFIG_IPV6_PRIVACY 183 .use_tempaddr = 0, 184 .temp_valid_lft = TEMP_VALID_LIFETIME, 185 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 186 .regen_max_retry = REGEN_MAX_RETRY, 187 .max_desync_factor = MAX_DESYNC_FACTOR, 188 #endif 189 .max_addresses = IPV6_MAX_ADDRESSES, 190 .accept_ra_defrtr = 1, 191 .accept_ra_pinfo = 1, 192 #ifdef CONFIG_IPV6_ROUTER_PREF 193 .accept_ra_rtr_pref = 1, 194 .rtr_probe_interval = 60 * HZ, 195 #ifdef CONFIG_IPV6_ROUTE_INFO 196 .accept_ra_rt_info_max_plen = 0, 197 #endif 198 #endif 199 .proxy_ndp = 0, 200 .accept_source_route = 0, /* we do not accept RH0 by default. */ 201 .disable_ipv6 = 0, 202 .accept_dad = 1, 203 }; 204 205 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 206 .forwarding = 0, 207 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 208 .mtu6 = IPV6_MIN_MTU, 209 .accept_ra = 1, 210 .accept_redirects = 1, 211 .autoconf = 1, 212 .dad_transmits = 1, 213 .rtr_solicits = MAX_RTR_SOLICITATIONS, 214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 216 #ifdef CONFIG_IPV6_PRIVACY 217 .use_tempaddr = 0, 218 .temp_valid_lft = TEMP_VALID_LIFETIME, 219 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 220 .regen_max_retry = REGEN_MAX_RETRY, 221 .max_desync_factor = MAX_DESYNC_FACTOR, 222 #endif 223 .max_addresses = IPV6_MAX_ADDRESSES, 224 .accept_ra_defrtr = 1, 225 .accept_ra_pinfo = 1, 226 #ifdef CONFIG_IPV6_ROUTER_PREF 227 .accept_ra_rtr_pref = 1, 228 .rtr_probe_interval = 60 * HZ, 229 #ifdef CONFIG_IPV6_ROUTE_INFO 230 .accept_ra_rt_info_max_plen = 0, 231 #endif 232 #endif 233 .proxy_ndp = 0, 234 .accept_source_route = 0, /* we do not accept RH0 by default. */ 235 .disable_ipv6 = 0, 236 .accept_dad = 1, 237 }; 238 239 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 240 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 241 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 242 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 243 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 244 245 /* Check if a valid qdisc is available */ 246 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 247 { 248 return !qdisc_tx_is_noop(dev); 249 } 250 251 /* Check if a route is valid prefix route */ 252 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 253 { 254 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 255 } 256 257 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 258 { 259 if (del_timer(&ifp->timer)) 260 __in6_ifa_put(ifp); 261 } 262 263 enum addrconf_timer_t { 264 AC_NONE, 265 AC_DAD, 266 AC_RS, 267 }; 268 269 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 270 enum addrconf_timer_t what, 271 unsigned long when) 272 { 273 if (!del_timer(&ifp->timer)) 274 in6_ifa_hold(ifp); 275 276 switch (what) { 277 case AC_DAD: 278 ifp->timer.function = addrconf_dad_timer; 279 break; 280 case AC_RS: 281 ifp->timer.function = addrconf_rs_timer; 282 break; 283 default: 284 break; 285 } 286 ifp->timer.expires = jiffies + when; 287 add_timer(&ifp->timer); 288 } 289 290 static int snmp6_alloc_dev(struct inet6_dev *idev) 291 { 292 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 293 sizeof(struct ipstats_mib), 294 __alignof__(struct ipstats_mib)) < 0) 295 goto err_ip; 296 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 297 GFP_KERNEL); 298 if (!idev->stats.icmpv6dev) 299 goto err_icmp; 300 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 301 GFP_KERNEL); 302 if (!idev->stats.icmpv6msgdev) 303 goto err_icmpmsg; 304 305 return 0; 306 307 err_icmpmsg: 308 kfree(idev->stats.icmpv6dev); 309 err_icmp: 310 snmp_mib_free((void __percpu **)idev->stats.ipv6); 311 err_ip: 312 return -ENOMEM; 313 } 314 315 static void snmp6_free_dev(struct inet6_dev *idev) 316 { 317 kfree(idev->stats.icmpv6msgdev); 318 kfree(idev->stats.icmpv6dev); 319 snmp_mib_free((void __percpu **)idev->stats.ipv6); 320 } 321 322 /* Nobody refers to this device, we may destroy it. */ 323 324 void in6_dev_finish_destroy(struct inet6_dev *idev) 325 { 326 struct net_device *dev = idev->dev; 327 328 WARN_ON(!list_empty(&idev->addr_list)); 329 WARN_ON(idev->mc_list != NULL); 330 331 #ifdef NET_REFCNT_DEBUG 332 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 333 #endif 334 dev_put(dev); 335 if (!idev->dead) { 336 pr_warn("Freeing alive inet6 device %p\n", idev); 337 return; 338 } 339 snmp6_free_dev(idev); 340 kfree_rcu(idev, rcu); 341 } 342 EXPORT_SYMBOL(in6_dev_finish_destroy); 343 344 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 345 { 346 struct inet6_dev *ndev; 347 348 ASSERT_RTNL(); 349 350 if (dev->mtu < IPV6_MIN_MTU) 351 return NULL; 352 353 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 354 355 if (ndev == NULL) 356 return NULL; 357 358 rwlock_init(&ndev->lock); 359 ndev->dev = dev; 360 INIT_LIST_HEAD(&ndev->addr_list); 361 362 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 363 ndev->cnf.mtu6 = dev->mtu; 364 ndev->cnf.sysctl = NULL; 365 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 366 if (ndev->nd_parms == NULL) { 367 kfree(ndev); 368 return NULL; 369 } 370 if (ndev->cnf.forwarding) 371 dev_disable_lro(dev); 372 /* We refer to the device */ 373 dev_hold(dev); 374 375 if (snmp6_alloc_dev(ndev) < 0) { 376 ADBG((KERN_WARNING 377 "%s: cannot allocate memory for statistics; dev=%s.\n", 378 __func__, dev->name)); 379 neigh_parms_release(&nd_tbl, ndev->nd_parms); 380 dev_put(dev); 381 kfree(ndev); 382 return NULL; 383 } 384 385 if (snmp6_register_dev(ndev) < 0) { 386 ADBG((KERN_WARNING 387 "%s: cannot create /proc/net/dev_snmp6/%s\n", 388 __func__, dev->name)); 389 neigh_parms_release(&nd_tbl, ndev->nd_parms); 390 ndev->dead = 1; 391 in6_dev_finish_destroy(ndev); 392 return NULL; 393 } 394 395 /* One reference from device. We must do this before 396 * we invoke __ipv6_regen_rndid(). 397 */ 398 in6_dev_hold(ndev); 399 400 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 401 ndev->cnf.accept_dad = -1; 402 403 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 404 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 405 pr_info("%s: Disabled Multicast RS\n", dev->name); 406 ndev->cnf.rtr_solicits = 0; 407 } 408 #endif 409 410 #ifdef CONFIG_IPV6_PRIVACY 411 INIT_LIST_HEAD(&ndev->tempaddr_list); 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 413 if ((dev->flags&IFF_LOOPBACK) || 414 dev->type == ARPHRD_TUNNEL || 415 dev->type == ARPHRD_TUNNEL6 || 416 dev->type == ARPHRD_SIT || 417 dev->type == ARPHRD_NONE) { 418 ndev->cnf.use_tempaddr = -1; 419 } else { 420 in6_dev_hold(ndev); 421 ipv6_regen_rndid((unsigned long) ndev); 422 } 423 #endif 424 425 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 426 ndev->if_flags |= IF_READY; 427 428 ipv6_mc_init_dev(ndev); 429 ndev->tstamp = jiffies; 430 addrconf_sysctl_register(ndev); 431 /* protected by rtnl_lock */ 432 rcu_assign_pointer(dev->ip6_ptr, ndev); 433 434 /* Join all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 436 437 /* Join all-router multicast group if forwarding is set */ 438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 440 441 return ndev; 442 } 443 444 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 445 { 446 struct inet6_dev *idev; 447 448 ASSERT_RTNL(); 449 450 idev = __in6_dev_get(dev); 451 if (!idev) { 452 idev = ipv6_add_dev(dev); 453 if (!idev) 454 return NULL; 455 } 456 457 if (dev->flags&IFF_UP) 458 ipv6_mc_up(idev); 459 return idev; 460 } 461 462 #ifdef CONFIG_SYSCTL 463 static void dev_forward_change(struct inet6_dev *idev) 464 { 465 struct net_device *dev; 466 struct inet6_ifaddr *ifa; 467 468 if (!idev) 469 return; 470 dev = idev->dev; 471 if (idev->cnf.forwarding) 472 dev_disable_lro(dev); 473 if (dev && (dev->flags & IFF_MULTICAST)) { 474 if (idev->cnf.forwarding) 475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 476 else 477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 478 } 479 480 list_for_each_entry(ifa, &idev->addr_list, if_list) { 481 if (ifa->flags&IFA_F_TENTATIVE) 482 continue; 483 if (idev->cnf.forwarding) 484 addrconf_join_anycast(ifa); 485 else 486 addrconf_leave_anycast(ifa); 487 } 488 } 489 490 491 static void addrconf_forward_change(struct net *net, __s32 newf) 492 { 493 struct net_device *dev; 494 struct inet6_dev *idev; 495 496 rcu_read_lock(); 497 for_each_netdev_rcu(net, dev) { 498 idev = __in6_dev_get(dev); 499 if (idev) { 500 int changed = (!idev->cnf.forwarding) ^ (!newf); 501 idev->cnf.forwarding = newf; 502 if (changed) 503 dev_forward_change(idev); 504 } 505 } 506 rcu_read_unlock(); 507 } 508 509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 510 { 511 struct net *net; 512 int old; 513 514 if (!rtnl_trylock()) 515 return restart_syscall(); 516 517 net = (struct net *)table->extra2; 518 old = *p; 519 *p = newf; 520 521 if (p == &net->ipv6.devconf_dflt->forwarding) { 522 rtnl_unlock(); 523 return 0; 524 } 525 526 if (p == &net->ipv6.devconf_all->forwarding) { 527 net->ipv6.devconf_dflt->forwarding = newf; 528 addrconf_forward_change(net, newf); 529 } else if ((!newf) ^ (!old)) 530 dev_forward_change((struct inet6_dev *)table->extra1); 531 rtnl_unlock(); 532 533 if (newf) 534 rt6_purge_dflt_routers(net); 535 return 1; 536 } 537 #endif 538 539 /* Nobody refers to this ifaddr, destroy it */ 540 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 541 { 542 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 543 544 #ifdef NET_REFCNT_DEBUG 545 pr_debug("%s\n", __func__); 546 #endif 547 548 in6_dev_put(ifp->idev); 549 550 if (del_timer(&ifp->timer)) 551 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 552 553 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 554 pr_warn("Freeing alive inet6 address %p\n", ifp); 555 return; 556 } 557 dst_release(&ifp->rt->dst); 558 559 kfree_rcu(ifp, rcu); 560 } 561 562 static void 563 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 564 { 565 struct list_head *p; 566 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 567 568 /* 569 * Each device address list is sorted in order of scope - 570 * global before linklocal. 571 */ 572 list_for_each(p, &idev->addr_list) { 573 struct inet6_ifaddr *ifa 574 = list_entry(p, struct inet6_ifaddr, if_list); 575 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 576 break; 577 } 578 579 list_add_tail(&ifp->if_list, p); 580 } 581 582 static u32 ipv6_addr_hash(const struct in6_addr *addr) 583 { 584 /* 585 * We perform the hash function over the last 64 bits of the address 586 * This will include the IEEE address token on links that support it. 587 */ 588 return jhash_2words((__force u32)addr->s6_addr32[2], 589 (__force u32)addr->s6_addr32[3], 0) 590 & (IN6_ADDR_HSIZE - 1); 591 } 592 593 /* On success it returns ifp with increased reference count */ 594 595 static struct inet6_ifaddr * 596 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 597 int scope, u32 flags) 598 { 599 struct inet6_ifaddr *ifa = NULL; 600 struct rt6_info *rt; 601 unsigned int hash; 602 int err = 0; 603 int addr_type = ipv6_addr_type(addr); 604 605 if (addr_type == IPV6_ADDR_ANY || 606 addr_type & IPV6_ADDR_MULTICAST || 607 (!(idev->dev->flags & IFF_LOOPBACK) && 608 addr_type & IPV6_ADDR_LOOPBACK)) 609 return ERR_PTR(-EADDRNOTAVAIL); 610 611 rcu_read_lock_bh(); 612 if (idev->dead) { 613 err = -ENODEV; /*XXX*/ 614 goto out2; 615 } 616 617 if (idev->cnf.disable_ipv6) { 618 err = -EACCES; 619 goto out2; 620 } 621 622 spin_lock(&addrconf_hash_lock); 623 624 /* Ignore adding duplicate addresses on an interface */ 625 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 626 ADBG(("ipv6_add_addr: already assigned\n")); 627 err = -EEXIST; 628 goto out; 629 } 630 631 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 632 633 if (ifa == NULL) { 634 ADBG(("ipv6_add_addr: malloc failed\n")); 635 err = -ENOBUFS; 636 goto out; 637 } 638 639 rt = addrconf_dst_alloc(idev, addr, false); 640 if (IS_ERR(rt)) { 641 err = PTR_ERR(rt); 642 goto out; 643 } 644 645 ifa->addr = *addr; 646 647 spin_lock_init(&ifa->lock); 648 spin_lock_init(&ifa->state_lock); 649 init_timer(&ifa->timer); 650 INIT_HLIST_NODE(&ifa->addr_lst); 651 ifa->timer.data = (unsigned long) ifa; 652 ifa->scope = scope; 653 ifa->prefix_len = pfxlen; 654 ifa->flags = flags | IFA_F_TENTATIVE; 655 ifa->cstamp = ifa->tstamp = jiffies; 656 657 ifa->rt = rt; 658 659 ifa->idev = idev; 660 in6_dev_hold(idev); 661 /* For caller */ 662 in6_ifa_hold(ifa); 663 664 /* Add to big hash table */ 665 hash = ipv6_addr_hash(addr); 666 667 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 668 spin_unlock(&addrconf_hash_lock); 669 670 write_lock(&idev->lock); 671 /* Add to inet6_dev unicast addr list. */ 672 ipv6_link_dev_addr(idev, ifa); 673 674 #ifdef CONFIG_IPV6_PRIVACY 675 if (ifa->flags&IFA_F_TEMPORARY) { 676 list_add(&ifa->tmp_list, &idev->tempaddr_list); 677 in6_ifa_hold(ifa); 678 } 679 #endif 680 681 in6_ifa_hold(ifa); 682 write_unlock(&idev->lock); 683 out2: 684 rcu_read_unlock_bh(); 685 686 if (likely(err == 0)) 687 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 688 else { 689 kfree(ifa); 690 ifa = ERR_PTR(err); 691 } 692 693 return ifa; 694 out: 695 spin_unlock(&addrconf_hash_lock); 696 goto out2; 697 } 698 699 /* This function wants to get referenced ifp and releases it before return */ 700 701 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 702 { 703 struct inet6_ifaddr *ifa, *ifn; 704 struct inet6_dev *idev = ifp->idev; 705 int state; 706 int deleted = 0, onlink = 0; 707 unsigned long expires = jiffies; 708 709 spin_lock_bh(&ifp->state_lock); 710 state = ifp->state; 711 ifp->state = INET6_IFADDR_STATE_DEAD; 712 spin_unlock_bh(&ifp->state_lock); 713 714 if (state == INET6_IFADDR_STATE_DEAD) 715 goto out; 716 717 spin_lock_bh(&addrconf_hash_lock); 718 hlist_del_init_rcu(&ifp->addr_lst); 719 spin_unlock_bh(&addrconf_hash_lock); 720 721 write_lock_bh(&idev->lock); 722 #ifdef CONFIG_IPV6_PRIVACY 723 if (ifp->flags&IFA_F_TEMPORARY) { 724 list_del(&ifp->tmp_list); 725 if (ifp->ifpub) { 726 in6_ifa_put(ifp->ifpub); 727 ifp->ifpub = NULL; 728 } 729 __in6_ifa_put(ifp); 730 } 731 #endif 732 733 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 734 if (ifa == ifp) { 735 list_del_init(&ifp->if_list); 736 __in6_ifa_put(ifp); 737 738 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 739 break; 740 deleted = 1; 741 continue; 742 } else if (ifp->flags & IFA_F_PERMANENT) { 743 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 744 ifp->prefix_len)) { 745 if (ifa->flags & IFA_F_PERMANENT) { 746 onlink = 1; 747 if (deleted) 748 break; 749 } else { 750 unsigned long lifetime; 751 752 if (!onlink) 753 onlink = -1; 754 755 spin_lock(&ifa->lock); 756 757 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 758 /* 759 * Note: Because this address is 760 * not permanent, lifetime < 761 * LONG_MAX / HZ here. 762 */ 763 if (time_before(expires, 764 ifa->tstamp + lifetime * HZ)) 765 expires = ifa->tstamp + lifetime * HZ; 766 spin_unlock(&ifa->lock); 767 } 768 } 769 } 770 } 771 write_unlock_bh(&idev->lock); 772 773 addrconf_del_timer(ifp); 774 775 ipv6_ifa_notify(RTM_DELADDR, ifp); 776 777 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 778 779 /* 780 * Purge or update corresponding prefix 781 * 782 * 1) we don't purge prefix here if address was not permanent. 783 * prefix is managed by its own lifetime. 784 * 2) if there're no addresses, delete prefix. 785 * 3) if there're still other permanent address(es), 786 * corresponding prefix is still permanent. 787 * 4) otherwise, update prefix lifetime to the 788 * longest valid lifetime among the corresponding 789 * addresses on the device. 790 * Note: subsequent RA will update lifetime. 791 * 792 * --yoshfuji 793 */ 794 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 795 struct in6_addr prefix; 796 struct rt6_info *rt; 797 struct net *net = dev_net(ifp->idev->dev); 798 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 799 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 800 801 if (rt && addrconf_is_prefix_route(rt)) { 802 if (onlink == 0) { 803 ip6_del_rt(rt); 804 rt = NULL; 805 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 806 rt6_set_expires(rt, expires); 807 } 808 } 809 dst_release(&rt->dst); 810 } 811 812 /* clean up prefsrc entries */ 813 rt6_remove_prefsrc(ifp); 814 out: 815 in6_ifa_put(ifp); 816 } 817 818 #ifdef CONFIG_IPV6_PRIVACY 819 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 820 { 821 struct inet6_dev *idev = ifp->idev; 822 struct in6_addr addr, *tmpaddr; 823 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 824 unsigned long regen_advance; 825 int tmp_plen; 826 int ret = 0; 827 int max_addresses; 828 u32 addr_flags; 829 unsigned long now = jiffies; 830 831 write_lock(&idev->lock); 832 if (ift) { 833 spin_lock_bh(&ift->lock); 834 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 835 spin_unlock_bh(&ift->lock); 836 tmpaddr = &addr; 837 } else { 838 tmpaddr = NULL; 839 } 840 retry: 841 in6_dev_hold(idev); 842 if (idev->cnf.use_tempaddr <= 0) { 843 write_unlock(&idev->lock); 844 pr_info("%s: use_tempaddr is disabled\n", __func__); 845 in6_dev_put(idev); 846 ret = -1; 847 goto out; 848 } 849 spin_lock_bh(&ifp->lock); 850 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 851 idev->cnf.use_tempaddr = -1; /*XXX*/ 852 spin_unlock_bh(&ifp->lock); 853 write_unlock(&idev->lock); 854 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 855 __func__); 856 in6_dev_put(idev); 857 ret = -1; 858 goto out; 859 } 860 in6_ifa_hold(ifp); 861 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 862 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 863 spin_unlock_bh(&ifp->lock); 864 write_unlock(&idev->lock); 865 pr_warn("%s: regeneration of randomized interface id failed\n", 866 __func__); 867 in6_ifa_put(ifp); 868 in6_dev_put(idev); 869 ret = -1; 870 goto out; 871 } 872 memcpy(&addr.s6_addr[8], idev->rndid, 8); 873 age = (now - ifp->tstamp) / HZ; 874 tmp_valid_lft = min_t(__u32, 875 ifp->valid_lft, 876 idev->cnf.temp_valid_lft + age); 877 tmp_prefered_lft = min_t(__u32, 878 ifp->prefered_lft, 879 idev->cnf.temp_prefered_lft + age - 880 idev->cnf.max_desync_factor); 881 tmp_plen = ifp->prefix_len; 882 max_addresses = idev->cnf.max_addresses; 883 tmp_tstamp = ifp->tstamp; 884 spin_unlock_bh(&ifp->lock); 885 886 regen_advance = idev->cnf.regen_max_retry * 887 idev->cnf.dad_transmits * 888 idev->nd_parms->retrans_time / HZ; 889 write_unlock(&idev->lock); 890 891 /* A temporary address is created only if this calculated Preferred 892 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 893 * an implementation must not create a temporary address with a zero 894 * Preferred Lifetime. 895 */ 896 if (tmp_prefered_lft <= regen_advance) { 897 in6_ifa_put(ifp); 898 in6_dev_put(idev); 899 ret = -1; 900 goto out; 901 } 902 903 addr_flags = IFA_F_TEMPORARY; 904 /* set in addrconf_prefix_rcv() */ 905 if (ifp->flags & IFA_F_OPTIMISTIC) 906 addr_flags |= IFA_F_OPTIMISTIC; 907 908 ift = !max_addresses || 909 ipv6_count_addresses(idev) < max_addresses ? 910 ipv6_add_addr(idev, &addr, tmp_plen, 911 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 912 addr_flags) : NULL; 913 if (!ift || IS_ERR(ift)) { 914 in6_ifa_put(ifp); 915 in6_dev_put(idev); 916 pr_info("%s: retry temporary address regeneration\n", __func__); 917 tmpaddr = &addr; 918 write_lock(&idev->lock); 919 goto retry; 920 } 921 922 spin_lock_bh(&ift->lock); 923 ift->ifpub = ifp; 924 ift->valid_lft = tmp_valid_lft; 925 ift->prefered_lft = tmp_prefered_lft; 926 ift->cstamp = now; 927 ift->tstamp = tmp_tstamp; 928 spin_unlock_bh(&ift->lock); 929 930 addrconf_dad_start(ift); 931 in6_ifa_put(ift); 932 in6_dev_put(idev); 933 out: 934 return ret; 935 } 936 #endif 937 938 /* 939 * Choose an appropriate source address (RFC3484) 940 */ 941 enum { 942 IPV6_SADDR_RULE_INIT = 0, 943 IPV6_SADDR_RULE_LOCAL, 944 IPV6_SADDR_RULE_SCOPE, 945 IPV6_SADDR_RULE_PREFERRED, 946 #ifdef CONFIG_IPV6_MIP6 947 IPV6_SADDR_RULE_HOA, 948 #endif 949 IPV6_SADDR_RULE_OIF, 950 IPV6_SADDR_RULE_LABEL, 951 #ifdef CONFIG_IPV6_PRIVACY 952 IPV6_SADDR_RULE_PRIVACY, 953 #endif 954 IPV6_SADDR_RULE_ORCHID, 955 IPV6_SADDR_RULE_PREFIX, 956 IPV6_SADDR_RULE_MAX 957 }; 958 959 struct ipv6_saddr_score { 960 int rule; 961 int addr_type; 962 struct inet6_ifaddr *ifa; 963 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 964 int scopedist; 965 int matchlen; 966 }; 967 968 struct ipv6_saddr_dst { 969 const struct in6_addr *addr; 970 int ifindex; 971 int scope; 972 int label; 973 unsigned int prefs; 974 }; 975 976 static inline int ipv6_saddr_preferred(int type) 977 { 978 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 979 return 1; 980 return 0; 981 } 982 983 static int ipv6_get_saddr_eval(struct net *net, 984 struct ipv6_saddr_score *score, 985 struct ipv6_saddr_dst *dst, 986 int i) 987 { 988 int ret; 989 990 if (i <= score->rule) { 991 switch (i) { 992 case IPV6_SADDR_RULE_SCOPE: 993 ret = score->scopedist; 994 break; 995 case IPV6_SADDR_RULE_PREFIX: 996 ret = score->matchlen; 997 break; 998 default: 999 ret = !!test_bit(i, score->scorebits); 1000 } 1001 goto out; 1002 } 1003 1004 switch (i) { 1005 case IPV6_SADDR_RULE_INIT: 1006 /* Rule 0: remember if hiscore is not ready yet */ 1007 ret = !!score->ifa; 1008 break; 1009 case IPV6_SADDR_RULE_LOCAL: 1010 /* Rule 1: Prefer same address */ 1011 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1012 break; 1013 case IPV6_SADDR_RULE_SCOPE: 1014 /* Rule 2: Prefer appropriate scope 1015 * 1016 * ret 1017 * ^ 1018 * -1 | d 15 1019 * ---+--+-+---> scope 1020 * | 1021 * | d is scope of the destination. 1022 * B-d | \ 1023 * | \ <- smaller scope is better if 1024 * B-15 | \ if scope is enough for destinaion. 1025 * | ret = B - scope (-1 <= scope >= d <= 15). 1026 * d-C-1 | / 1027 * |/ <- greater is better 1028 * -C / if scope is not enough for destination. 1029 * /| ret = scope - C (-1 <= d < scope <= 15). 1030 * 1031 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1032 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1033 * Assume B = 0 and we get C > 29. 1034 */ 1035 ret = __ipv6_addr_src_scope(score->addr_type); 1036 if (ret >= dst->scope) 1037 ret = -ret; 1038 else 1039 ret -= 128; /* 30 is enough */ 1040 score->scopedist = ret; 1041 break; 1042 case IPV6_SADDR_RULE_PREFERRED: 1043 /* Rule 3: Avoid deprecated and optimistic addresses */ 1044 ret = ipv6_saddr_preferred(score->addr_type) || 1045 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1046 break; 1047 #ifdef CONFIG_IPV6_MIP6 1048 case IPV6_SADDR_RULE_HOA: 1049 { 1050 /* Rule 4: Prefer home address */ 1051 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1052 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1053 break; 1054 } 1055 #endif 1056 case IPV6_SADDR_RULE_OIF: 1057 /* Rule 5: Prefer outgoing interface */ 1058 ret = (!dst->ifindex || 1059 dst->ifindex == score->ifa->idev->dev->ifindex); 1060 break; 1061 case IPV6_SADDR_RULE_LABEL: 1062 /* Rule 6: Prefer matching label */ 1063 ret = ipv6_addr_label(net, 1064 &score->ifa->addr, score->addr_type, 1065 score->ifa->idev->dev->ifindex) == dst->label; 1066 break; 1067 #ifdef CONFIG_IPV6_PRIVACY 1068 case IPV6_SADDR_RULE_PRIVACY: 1069 { 1070 /* Rule 7: Prefer public address 1071 * Note: prefer temporary address if use_tempaddr >= 2 1072 */ 1073 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1074 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1075 score->ifa->idev->cnf.use_tempaddr >= 2; 1076 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1077 break; 1078 } 1079 #endif 1080 case IPV6_SADDR_RULE_ORCHID: 1081 /* Rule 8-: Prefer ORCHID vs ORCHID or 1082 * non-ORCHID vs non-ORCHID 1083 */ 1084 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1085 ipv6_addr_orchid(dst->addr)); 1086 break; 1087 case IPV6_SADDR_RULE_PREFIX: 1088 /* Rule 8: Use longest matching prefix */ 1089 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1090 dst->addr); 1091 break; 1092 default: 1093 ret = 0; 1094 } 1095 1096 if (ret) 1097 __set_bit(i, score->scorebits); 1098 score->rule = i; 1099 out: 1100 return ret; 1101 } 1102 1103 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1104 const struct in6_addr *daddr, unsigned int prefs, 1105 struct in6_addr *saddr) 1106 { 1107 struct ipv6_saddr_score scores[2], 1108 *score = &scores[0], *hiscore = &scores[1]; 1109 struct ipv6_saddr_dst dst; 1110 struct net_device *dev; 1111 int dst_type; 1112 1113 dst_type = __ipv6_addr_type(daddr); 1114 dst.addr = daddr; 1115 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1116 dst.scope = __ipv6_addr_src_scope(dst_type); 1117 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1118 dst.prefs = prefs; 1119 1120 hiscore->rule = -1; 1121 hiscore->ifa = NULL; 1122 1123 rcu_read_lock(); 1124 1125 for_each_netdev_rcu(net, dev) { 1126 struct inet6_dev *idev; 1127 1128 /* Candidate Source Address (section 4) 1129 * - multicast and link-local destination address, 1130 * the set of candidate source address MUST only 1131 * include addresses assigned to interfaces 1132 * belonging to the same link as the outgoing 1133 * interface. 1134 * (- For site-local destination addresses, the 1135 * set of candidate source addresses MUST only 1136 * include addresses assigned to interfaces 1137 * belonging to the same site as the outgoing 1138 * interface.) 1139 */ 1140 if (((dst_type & IPV6_ADDR_MULTICAST) || 1141 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1142 dst.ifindex && dev->ifindex != dst.ifindex) 1143 continue; 1144 1145 idev = __in6_dev_get(dev); 1146 if (!idev) 1147 continue; 1148 1149 read_lock_bh(&idev->lock); 1150 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1151 int i; 1152 1153 /* 1154 * - Tentative Address (RFC2462 section 5.4) 1155 * - A tentative address is not considered 1156 * "assigned to an interface" in the traditional 1157 * sense, unless it is also flagged as optimistic. 1158 * - Candidate Source Address (section 4) 1159 * - In any case, anycast addresses, multicast 1160 * addresses, and the unspecified address MUST 1161 * NOT be included in a candidate set. 1162 */ 1163 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1164 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1165 continue; 1166 1167 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1168 1169 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1170 score->addr_type & IPV6_ADDR_MULTICAST)) { 1171 LIMIT_NETDEBUG(KERN_DEBUG 1172 "ADDRCONF: unspecified / multicast address " 1173 "assigned as unicast address on %s", 1174 dev->name); 1175 continue; 1176 } 1177 1178 score->rule = -1; 1179 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1180 1181 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1182 int minihiscore, miniscore; 1183 1184 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1185 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1186 1187 if (minihiscore > miniscore) { 1188 if (i == IPV6_SADDR_RULE_SCOPE && 1189 score->scopedist > 0) { 1190 /* 1191 * special case: 1192 * each remaining entry 1193 * has too small (not enough) 1194 * scope, because ifa entries 1195 * are sorted by their scope 1196 * values. 1197 */ 1198 goto try_nextdev; 1199 } 1200 break; 1201 } else if (minihiscore < miniscore) { 1202 if (hiscore->ifa) 1203 in6_ifa_put(hiscore->ifa); 1204 1205 in6_ifa_hold(score->ifa); 1206 1207 swap(hiscore, score); 1208 1209 /* restore our iterator */ 1210 score->ifa = hiscore->ifa; 1211 1212 break; 1213 } 1214 } 1215 } 1216 try_nextdev: 1217 read_unlock_bh(&idev->lock); 1218 } 1219 rcu_read_unlock(); 1220 1221 if (!hiscore->ifa) 1222 return -EADDRNOTAVAIL; 1223 1224 *saddr = hiscore->ifa->addr; 1225 in6_ifa_put(hiscore->ifa); 1226 return 0; 1227 } 1228 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1229 1230 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1231 unsigned char banned_flags) 1232 { 1233 struct inet6_dev *idev; 1234 int err = -EADDRNOTAVAIL; 1235 1236 rcu_read_lock(); 1237 idev = __in6_dev_get(dev); 1238 if (idev) { 1239 struct inet6_ifaddr *ifp; 1240 1241 read_lock_bh(&idev->lock); 1242 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1243 if (ifp->scope == IFA_LINK && 1244 !(ifp->flags & banned_flags)) { 1245 *addr = ifp->addr; 1246 err = 0; 1247 break; 1248 } 1249 } 1250 read_unlock_bh(&idev->lock); 1251 } 1252 rcu_read_unlock(); 1253 return err; 1254 } 1255 1256 static int ipv6_count_addresses(struct inet6_dev *idev) 1257 { 1258 int cnt = 0; 1259 struct inet6_ifaddr *ifp; 1260 1261 read_lock_bh(&idev->lock); 1262 list_for_each_entry(ifp, &idev->addr_list, if_list) 1263 cnt++; 1264 read_unlock_bh(&idev->lock); 1265 return cnt; 1266 } 1267 1268 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1269 struct net_device *dev, int strict) 1270 { 1271 struct inet6_ifaddr *ifp; 1272 struct hlist_node *node; 1273 unsigned int hash = ipv6_addr_hash(addr); 1274 1275 rcu_read_lock_bh(); 1276 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1277 if (!net_eq(dev_net(ifp->idev->dev), net)) 1278 continue; 1279 if (ipv6_addr_equal(&ifp->addr, addr) && 1280 !(ifp->flags&IFA_F_TENTATIVE) && 1281 (dev == NULL || ifp->idev->dev == dev || 1282 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1283 rcu_read_unlock_bh(); 1284 return 1; 1285 } 1286 } 1287 1288 rcu_read_unlock_bh(); 1289 return 0; 1290 } 1291 EXPORT_SYMBOL(ipv6_chk_addr); 1292 1293 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1294 struct net_device *dev) 1295 { 1296 unsigned int hash = ipv6_addr_hash(addr); 1297 struct inet6_ifaddr *ifp; 1298 struct hlist_node *node; 1299 1300 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1301 if (!net_eq(dev_net(ifp->idev->dev), net)) 1302 continue; 1303 if (ipv6_addr_equal(&ifp->addr, addr)) { 1304 if (dev == NULL || ifp->idev->dev == dev) 1305 return true; 1306 } 1307 } 1308 return false; 1309 } 1310 1311 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1312 { 1313 struct inet6_dev *idev; 1314 struct inet6_ifaddr *ifa; 1315 int onlink; 1316 1317 onlink = 0; 1318 rcu_read_lock(); 1319 idev = __in6_dev_get(dev); 1320 if (idev) { 1321 read_lock_bh(&idev->lock); 1322 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1323 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1324 ifa->prefix_len); 1325 if (onlink) 1326 break; 1327 } 1328 read_unlock_bh(&idev->lock); 1329 } 1330 rcu_read_unlock(); 1331 return onlink; 1332 } 1333 EXPORT_SYMBOL(ipv6_chk_prefix); 1334 1335 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1336 struct net_device *dev, int strict) 1337 { 1338 struct inet6_ifaddr *ifp, *result = NULL; 1339 unsigned int hash = ipv6_addr_hash(addr); 1340 struct hlist_node *node; 1341 1342 rcu_read_lock_bh(); 1343 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1344 if (!net_eq(dev_net(ifp->idev->dev), net)) 1345 continue; 1346 if (ipv6_addr_equal(&ifp->addr, addr)) { 1347 if (dev == NULL || ifp->idev->dev == dev || 1348 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1349 result = ifp; 1350 in6_ifa_hold(ifp); 1351 break; 1352 } 1353 } 1354 } 1355 rcu_read_unlock_bh(); 1356 1357 return result; 1358 } 1359 1360 /* Gets referenced address, destroys ifaddr */ 1361 1362 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1363 { 1364 if (ifp->flags&IFA_F_PERMANENT) { 1365 spin_lock_bh(&ifp->lock); 1366 addrconf_del_timer(ifp); 1367 ifp->flags |= IFA_F_TENTATIVE; 1368 if (dad_failed) 1369 ifp->flags |= IFA_F_DADFAILED; 1370 spin_unlock_bh(&ifp->lock); 1371 if (dad_failed) 1372 ipv6_ifa_notify(0, ifp); 1373 in6_ifa_put(ifp); 1374 #ifdef CONFIG_IPV6_PRIVACY 1375 } else if (ifp->flags&IFA_F_TEMPORARY) { 1376 struct inet6_ifaddr *ifpub; 1377 spin_lock_bh(&ifp->lock); 1378 ifpub = ifp->ifpub; 1379 if (ifpub) { 1380 in6_ifa_hold(ifpub); 1381 spin_unlock_bh(&ifp->lock); 1382 ipv6_create_tempaddr(ifpub, ifp); 1383 in6_ifa_put(ifpub); 1384 } else { 1385 spin_unlock_bh(&ifp->lock); 1386 } 1387 ipv6_del_addr(ifp); 1388 #endif 1389 } else 1390 ipv6_del_addr(ifp); 1391 } 1392 1393 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1394 { 1395 int err = -ENOENT; 1396 1397 spin_lock(&ifp->state_lock); 1398 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1399 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1400 err = 0; 1401 } 1402 spin_unlock(&ifp->state_lock); 1403 1404 return err; 1405 } 1406 1407 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1408 { 1409 struct inet6_dev *idev = ifp->idev; 1410 1411 if (addrconf_dad_end(ifp)) { 1412 in6_ifa_put(ifp); 1413 return; 1414 } 1415 1416 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1417 ifp->idev->dev->name, &ifp->addr); 1418 1419 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1420 struct in6_addr addr; 1421 1422 addr.s6_addr32[0] = htonl(0xfe800000); 1423 addr.s6_addr32[1] = 0; 1424 1425 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1426 ipv6_addr_equal(&ifp->addr, &addr)) { 1427 /* DAD failed for link-local based on MAC address */ 1428 idev->cnf.disable_ipv6 = 1; 1429 1430 pr_info("%s: IPv6 being disabled!\n", 1431 ifp->idev->dev->name); 1432 } 1433 } 1434 1435 addrconf_dad_stop(ifp, 1); 1436 } 1437 1438 /* Join to solicited addr multicast group. */ 1439 1440 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1441 { 1442 struct in6_addr maddr; 1443 1444 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1445 return; 1446 1447 addrconf_addr_solict_mult(addr, &maddr); 1448 ipv6_dev_mc_inc(dev, &maddr); 1449 } 1450 1451 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1452 { 1453 struct in6_addr maddr; 1454 1455 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1456 return; 1457 1458 addrconf_addr_solict_mult(addr, &maddr); 1459 __ipv6_dev_mc_dec(idev, &maddr); 1460 } 1461 1462 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1463 { 1464 struct in6_addr addr; 1465 if (ifp->prefix_len == 127) /* RFC 6164 */ 1466 return; 1467 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1468 if (ipv6_addr_any(&addr)) 1469 return; 1470 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1471 } 1472 1473 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1474 { 1475 struct in6_addr addr; 1476 if (ifp->prefix_len == 127) /* RFC 6164 */ 1477 return; 1478 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1479 if (ipv6_addr_any(&addr)) 1480 return; 1481 __ipv6_dev_ac_dec(ifp->idev, &addr); 1482 } 1483 1484 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1485 { 1486 if (dev->addr_len != ETH_ALEN) 1487 return -1; 1488 memcpy(eui, dev->dev_addr, 3); 1489 memcpy(eui + 5, dev->dev_addr + 3, 3); 1490 1491 /* 1492 * The zSeries OSA network cards can be shared among various 1493 * OS instances, but the OSA cards have only one MAC address. 1494 * This leads to duplicate address conflicts in conjunction 1495 * with IPv6 if more than one instance uses the same card. 1496 * 1497 * The driver for these cards can deliver a unique 16-bit 1498 * identifier for each instance sharing the same card. It is 1499 * placed instead of 0xFFFE in the interface identifier. The 1500 * "u" bit of the interface identifier is not inverted in this 1501 * case. Hence the resulting interface identifier has local 1502 * scope according to RFC2373. 1503 */ 1504 if (dev->dev_id) { 1505 eui[3] = (dev->dev_id >> 8) & 0xFF; 1506 eui[4] = dev->dev_id & 0xFF; 1507 } else { 1508 eui[3] = 0xFF; 1509 eui[4] = 0xFE; 1510 eui[0] ^= 2; 1511 } 1512 return 0; 1513 } 1514 1515 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1516 { 1517 if (dev->addr_len != IEEE802154_ADDR_LEN) 1518 return -1; 1519 memcpy(eui, dev->dev_addr, 8); 1520 return 0; 1521 } 1522 1523 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1524 { 1525 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1526 if (dev->addr_len != ARCNET_ALEN) 1527 return -1; 1528 memset(eui, 0, 7); 1529 eui[7] = *(u8 *)dev->dev_addr; 1530 return 0; 1531 } 1532 1533 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1534 { 1535 if (dev->addr_len != INFINIBAND_ALEN) 1536 return -1; 1537 memcpy(eui, dev->dev_addr + 12, 8); 1538 eui[0] |= 2; 1539 return 0; 1540 } 1541 1542 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1543 { 1544 if (addr == 0) 1545 return -1; 1546 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1547 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1548 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1549 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1550 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1551 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1552 eui[1] = 0; 1553 eui[2] = 0x5E; 1554 eui[3] = 0xFE; 1555 memcpy(eui + 4, &addr, 4); 1556 return 0; 1557 } 1558 1559 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1560 { 1561 if (dev->priv_flags & IFF_ISATAP) 1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1563 return -1; 1564 } 1565 1566 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1567 { 1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1569 } 1570 1571 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1572 { 1573 switch (dev->type) { 1574 case ARPHRD_ETHER: 1575 case ARPHRD_FDDI: 1576 return addrconf_ifid_eui48(eui, dev); 1577 case ARPHRD_ARCNET: 1578 return addrconf_ifid_arcnet(eui, dev); 1579 case ARPHRD_INFINIBAND: 1580 return addrconf_ifid_infiniband(eui, dev); 1581 case ARPHRD_SIT: 1582 return addrconf_ifid_sit(eui, dev); 1583 case ARPHRD_IPGRE: 1584 return addrconf_ifid_gre(eui, dev); 1585 case ARPHRD_IEEE802154: 1586 return addrconf_ifid_eui64(eui, dev); 1587 } 1588 return -1; 1589 } 1590 1591 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1592 { 1593 int err = -1; 1594 struct inet6_ifaddr *ifp; 1595 1596 read_lock_bh(&idev->lock); 1597 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1598 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1599 memcpy(eui, ifp->addr.s6_addr+8, 8); 1600 err = 0; 1601 break; 1602 } 1603 } 1604 read_unlock_bh(&idev->lock); 1605 return err; 1606 } 1607 1608 #ifdef CONFIG_IPV6_PRIVACY 1609 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1610 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1611 { 1612 regen: 1613 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1614 idev->rndid[0] &= ~0x02; 1615 1616 /* 1617 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1618 * check if generated address is not inappropriate 1619 * 1620 * - Reserved subnet anycast (RFC 2526) 1621 * 11111101 11....11 1xxxxxxx 1622 * - ISATAP (RFC4214) 6.1 1623 * 00-00-5E-FE-xx-xx-xx-xx 1624 * - value 0 1625 * - XXX: already assigned to an address on the device 1626 */ 1627 if (idev->rndid[0] == 0xfd && 1628 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1629 (idev->rndid[7]&0x80)) 1630 goto regen; 1631 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1632 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1633 goto regen; 1634 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1635 goto regen; 1636 } 1637 1638 return 0; 1639 } 1640 1641 static void ipv6_regen_rndid(unsigned long data) 1642 { 1643 struct inet6_dev *idev = (struct inet6_dev *) data; 1644 unsigned long expires; 1645 1646 rcu_read_lock_bh(); 1647 write_lock_bh(&idev->lock); 1648 1649 if (idev->dead) 1650 goto out; 1651 1652 if (__ipv6_regen_rndid(idev) < 0) 1653 goto out; 1654 1655 expires = jiffies + 1656 idev->cnf.temp_prefered_lft * HZ - 1657 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1658 idev->cnf.max_desync_factor * HZ; 1659 if (time_before(expires, jiffies)) { 1660 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1661 __func__, idev->dev->name); 1662 goto out; 1663 } 1664 1665 if (!mod_timer(&idev->regen_timer, expires)) 1666 in6_dev_hold(idev); 1667 1668 out: 1669 write_unlock_bh(&idev->lock); 1670 rcu_read_unlock_bh(); 1671 in6_dev_put(idev); 1672 } 1673 1674 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1675 { 1676 int ret = 0; 1677 1678 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1679 ret = __ipv6_regen_rndid(idev); 1680 return ret; 1681 } 1682 #endif 1683 1684 /* 1685 * Add prefix route. 1686 */ 1687 1688 static void 1689 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1690 unsigned long expires, u32 flags) 1691 { 1692 struct fib6_config cfg = { 1693 .fc_table = RT6_TABLE_PREFIX, 1694 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1695 .fc_ifindex = dev->ifindex, 1696 .fc_expires = expires, 1697 .fc_dst_len = plen, 1698 .fc_flags = RTF_UP | flags, 1699 .fc_nlinfo.nl_net = dev_net(dev), 1700 .fc_protocol = RTPROT_KERNEL, 1701 }; 1702 1703 cfg.fc_dst = *pfx; 1704 1705 /* Prevent useless cloning on PtP SIT. 1706 This thing is done here expecting that the whole 1707 class of non-broadcast devices need not cloning. 1708 */ 1709 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1710 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1711 cfg.fc_flags |= RTF_NONEXTHOP; 1712 #endif 1713 1714 ip6_route_add(&cfg); 1715 } 1716 1717 1718 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1719 int plen, 1720 const struct net_device *dev, 1721 u32 flags, u32 noflags) 1722 { 1723 struct fib6_node *fn; 1724 struct rt6_info *rt = NULL; 1725 struct fib6_table *table; 1726 1727 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1728 if (table == NULL) 1729 return NULL; 1730 1731 write_lock_bh(&table->tb6_lock); 1732 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1733 if (!fn) 1734 goto out; 1735 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1736 if (rt->dst.dev->ifindex != dev->ifindex) 1737 continue; 1738 if ((rt->rt6i_flags & flags) != flags) 1739 continue; 1740 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0)) 1741 continue; 1742 dst_hold(&rt->dst); 1743 break; 1744 } 1745 out: 1746 write_unlock_bh(&table->tb6_lock); 1747 return rt; 1748 } 1749 1750 1751 /* Create "default" multicast route to the interface */ 1752 1753 static void addrconf_add_mroute(struct net_device *dev) 1754 { 1755 struct fib6_config cfg = { 1756 .fc_table = RT6_TABLE_LOCAL, 1757 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1758 .fc_ifindex = dev->ifindex, 1759 .fc_dst_len = 8, 1760 .fc_flags = RTF_UP, 1761 .fc_nlinfo.nl_net = dev_net(dev), 1762 }; 1763 1764 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1765 1766 ip6_route_add(&cfg); 1767 } 1768 1769 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1770 static void sit_route_add(struct net_device *dev) 1771 { 1772 struct fib6_config cfg = { 1773 .fc_table = RT6_TABLE_MAIN, 1774 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1775 .fc_ifindex = dev->ifindex, 1776 .fc_dst_len = 96, 1777 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1778 .fc_nlinfo.nl_net = dev_net(dev), 1779 }; 1780 1781 /* prefix length - 96 bits "::d.d.d.d" */ 1782 ip6_route_add(&cfg); 1783 } 1784 #endif 1785 1786 static void addrconf_add_lroute(struct net_device *dev) 1787 { 1788 struct in6_addr addr; 1789 1790 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1791 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1792 } 1793 1794 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1795 { 1796 struct inet6_dev *idev; 1797 1798 ASSERT_RTNL(); 1799 1800 idev = ipv6_find_idev(dev); 1801 if (!idev) 1802 return ERR_PTR(-ENOBUFS); 1803 1804 if (idev->cnf.disable_ipv6) 1805 return ERR_PTR(-EACCES); 1806 1807 /* Add default multicast route */ 1808 if (!(dev->flags & IFF_LOOPBACK)) 1809 addrconf_add_mroute(dev); 1810 1811 /* Add link local route */ 1812 addrconf_add_lroute(dev); 1813 return idev; 1814 } 1815 1816 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 1817 { 1818 struct prefix_info *pinfo; 1819 __u32 valid_lft; 1820 __u32 prefered_lft; 1821 int addr_type; 1822 struct inet6_dev *in6_dev; 1823 struct net *net = dev_net(dev); 1824 1825 pinfo = (struct prefix_info *) opt; 1826 1827 if (len < sizeof(struct prefix_info)) { 1828 ADBG(("addrconf: prefix option too short\n")); 1829 return; 1830 } 1831 1832 /* 1833 * Validation checks ([ADDRCONF], page 19) 1834 */ 1835 1836 addr_type = ipv6_addr_type(&pinfo->prefix); 1837 1838 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1839 return; 1840 1841 valid_lft = ntohl(pinfo->valid); 1842 prefered_lft = ntohl(pinfo->prefered); 1843 1844 if (prefered_lft > valid_lft) { 1845 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 1846 return; 1847 } 1848 1849 in6_dev = in6_dev_get(dev); 1850 1851 if (in6_dev == NULL) { 1852 net_dbg_ratelimited("addrconf: device %s not configured\n", 1853 dev->name); 1854 return; 1855 } 1856 1857 /* 1858 * Two things going on here: 1859 * 1) Add routes for on-link prefixes 1860 * 2) Configure prefixes with the auto flag set 1861 */ 1862 1863 if (pinfo->onlink) { 1864 struct rt6_info *rt; 1865 unsigned long rt_expires; 1866 1867 /* Avoid arithmetic overflow. Really, we could 1868 * save rt_expires in seconds, likely valid_lft, 1869 * but it would require division in fib gc, that it 1870 * not good. 1871 */ 1872 if (HZ > USER_HZ) 1873 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1874 else 1875 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1876 1877 if (addrconf_finite_timeout(rt_expires)) 1878 rt_expires *= HZ; 1879 1880 rt = addrconf_get_prefix_route(&pinfo->prefix, 1881 pinfo->prefix_len, 1882 dev, 1883 RTF_ADDRCONF | RTF_PREFIX_RT, 1884 RTF_GATEWAY | RTF_DEFAULT); 1885 1886 if (rt) { 1887 /* Autoconf prefix route */ 1888 if (valid_lft == 0) { 1889 ip6_del_rt(rt); 1890 rt = NULL; 1891 } else if (addrconf_finite_timeout(rt_expires)) { 1892 /* not infinity */ 1893 rt6_set_expires(rt, jiffies + rt_expires); 1894 } else { 1895 rt6_clean_expires(rt); 1896 } 1897 } else if (valid_lft) { 1898 clock_t expires = 0; 1899 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1900 if (addrconf_finite_timeout(rt_expires)) { 1901 /* not infinity */ 1902 flags |= RTF_EXPIRES; 1903 expires = jiffies_to_clock_t(rt_expires); 1904 } 1905 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1906 dev, expires, flags); 1907 } 1908 if (rt) 1909 dst_release(&rt->dst); 1910 } 1911 1912 /* Try to figure out our local address for this prefix */ 1913 1914 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1915 struct inet6_ifaddr *ifp; 1916 struct in6_addr addr; 1917 int create = 0, update_lft = 0; 1918 1919 if (pinfo->prefix_len == 64) { 1920 memcpy(&addr, &pinfo->prefix, 8); 1921 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1922 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1923 in6_dev_put(in6_dev); 1924 return; 1925 } 1926 goto ok; 1927 } 1928 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 1929 pinfo->prefix_len); 1930 in6_dev_put(in6_dev); 1931 return; 1932 1933 ok: 1934 1935 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1936 1937 if (ifp == NULL && valid_lft) { 1938 int max_addresses = in6_dev->cnf.max_addresses; 1939 u32 addr_flags = 0; 1940 1941 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1942 if (in6_dev->cnf.optimistic_dad && 1943 !net->ipv6.devconf_all->forwarding && sllao) 1944 addr_flags = IFA_F_OPTIMISTIC; 1945 #endif 1946 1947 /* Do not allow to create too much of autoconfigured 1948 * addresses; this would be too easy way to crash kernel. 1949 */ 1950 if (!max_addresses || 1951 ipv6_count_addresses(in6_dev) < max_addresses) 1952 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1953 addr_type&IPV6_ADDR_SCOPE_MASK, 1954 addr_flags); 1955 1956 if (!ifp || IS_ERR(ifp)) { 1957 in6_dev_put(in6_dev); 1958 return; 1959 } 1960 1961 update_lft = create = 1; 1962 ifp->cstamp = jiffies; 1963 addrconf_dad_start(ifp); 1964 } 1965 1966 if (ifp) { 1967 int flags; 1968 unsigned long now; 1969 #ifdef CONFIG_IPV6_PRIVACY 1970 struct inet6_ifaddr *ift; 1971 #endif 1972 u32 stored_lft; 1973 1974 /* update lifetime (RFC2462 5.5.3 e) */ 1975 spin_lock(&ifp->lock); 1976 now = jiffies; 1977 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1978 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1979 else 1980 stored_lft = 0; 1981 if (!update_lft && stored_lft) { 1982 if (valid_lft > MIN_VALID_LIFETIME || 1983 valid_lft > stored_lft) 1984 update_lft = 1; 1985 else if (stored_lft <= MIN_VALID_LIFETIME) { 1986 /* valid_lft <= stored_lft is always true */ 1987 /* 1988 * RFC 4862 Section 5.5.3e: 1989 * "Note that the preferred lifetime of 1990 * the corresponding address is always 1991 * reset to the Preferred Lifetime in 1992 * the received Prefix Information 1993 * option, regardless of whether the 1994 * valid lifetime is also reset or 1995 * ignored." 1996 * 1997 * So if the preferred lifetime in 1998 * this advertisement is different 1999 * than what we have stored, but the 2000 * valid lifetime is invalid, just 2001 * reset prefered_lft. 2002 * 2003 * We must set the valid lifetime 2004 * to the stored lifetime since we'll 2005 * be updating the timestamp below, 2006 * else we'll set it back to the 2007 * minimum. 2008 */ 2009 if (prefered_lft != ifp->prefered_lft) { 2010 valid_lft = stored_lft; 2011 update_lft = 1; 2012 } 2013 } else { 2014 valid_lft = MIN_VALID_LIFETIME; 2015 if (valid_lft < prefered_lft) 2016 prefered_lft = valid_lft; 2017 update_lft = 1; 2018 } 2019 } 2020 2021 if (update_lft) { 2022 ifp->valid_lft = valid_lft; 2023 ifp->prefered_lft = prefered_lft; 2024 ifp->tstamp = now; 2025 flags = ifp->flags; 2026 ifp->flags &= ~IFA_F_DEPRECATED; 2027 spin_unlock(&ifp->lock); 2028 2029 if (!(flags&IFA_F_TENTATIVE)) 2030 ipv6_ifa_notify(0, ifp); 2031 } else 2032 spin_unlock(&ifp->lock); 2033 2034 #ifdef CONFIG_IPV6_PRIVACY 2035 read_lock_bh(&in6_dev->lock); 2036 /* update all temporary addresses in the list */ 2037 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2038 tmp_list) { 2039 int age, max_valid, max_prefered; 2040 2041 if (ifp != ift->ifpub) 2042 continue; 2043 2044 /* 2045 * RFC 4941 section 3.3: 2046 * If a received option will extend the lifetime 2047 * of a public address, the lifetimes of 2048 * temporary addresses should be extended, 2049 * subject to the overall constraint that no 2050 * temporary addresses should ever remain 2051 * "valid" or "preferred" for a time longer than 2052 * (TEMP_VALID_LIFETIME) or 2053 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2054 * respectively. 2055 */ 2056 age = (now - ift->cstamp) / HZ; 2057 max_valid = in6_dev->cnf.temp_valid_lft - age; 2058 if (max_valid < 0) 2059 max_valid = 0; 2060 2061 max_prefered = in6_dev->cnf.temp_prefered_lft - 2062 in6_dev->cnf.max_desync_factor - 2063 age; 2064 if (max_prefered < 0) 2065 max_prefered = 0; 2066 2067 if (valid_lft > max_valid) 2068 valid_lft = max_valid; 2069 2070 if (prefered_lft > max_prefered) 2071 prefered_lft = max_prefered; 2072 2073 spin_lock(&ift->lock); 2074 flags = ift->flags; 2075 ift->valid_lft = valid_lft; 2076 ift->prefered_lft = prefered_lft; 2077 ift->tstamp = now; 2078 if (prefered_lft > 0) 2079 ift->flags &= ~IFA_F_DEPRECATED; 2080 2081 spin_unlock(&ift->lock); 2082 if (!(flags&IFA_F_TENTATIVE)) 2083 ipv6_ifa_notify(0, ift); 2084 } 2085 2086 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2087 /* 2088 * When a new public address is created as 2089 * described in [ADDRCONF], also create a new 2090 * temporary address. Also create a temporary 2091 * address if it's enabled but no temporary 2092 * address currently exists. 2093 */ 2094 read_unlock_bh(&in6_dev->lock); 2095 ipv6_create_tempaddr(ifp, NULL); 2096 } else { 2097 read_unlock_bh(&in6_dev->lock); 2098 } 2099 #endif 2100 in6_ifa_put(ifp); 2101 addrconf_verify(0); 2102 } 2103 } 2104 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2105 in6_dev_put(in6_dev); 2106 } 2107 2108 /* 2109 * Set destination address. 2110 * Special case for SIT interfaces where we create a new "virtual" 2111 * device. 2112 */ 2113 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2114 { 2115 struct in6_ifreq ireq; 2116 struct net_device *dev; 2117 int err = -EINVAL; 2118 2119 rtnl_lock(); 2120 2121 err = -EFAULT; 2122 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2123 goto err_exit; 2124 2125 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2126 2127 err = -ENODEV; 2128 if (dev == NULL) 2129 goto err_exit; 2130 2131 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2132 if (dev->type == ARPHRD_SIT) { 2133 const struct net_device_ops *ops = dev->netdev_ops; 2134 struct ifreq ifr; 2135 struct ip_tunnel_parm p; 2136 2137 err = -EADDRNOTAVAIL; 2138 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2139 goto err_exit; 2140 2141 memset(&p, 0, sizeof(p)); 2142 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2143 p.iph.saddr = 0; 2144 p.iph.version = 4; 2145 p.iph.ihl = 5; 2146 p.iph.protocol = IPPROTO_IPV6; 2147 p.iph.ttl = 64; 2148 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2149 2150 if (ops->ndo_do_ioctl) { 2151 mm_segment_t oldfs = get_fs(); 2152 2153 set_fs(KERNEL_DS); 2154 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2155 set_fs(oldfs); 2156 } else 2157 err = -EOPNOTSUPP; 2158 2159 if (err == 0) { 2160 err = -ENOBUFS; 2161 dev = __dev_get_by_name(net, p.name); 2162 if (!dev) 2163 goto err_exit; 2164 err = dev_open(dev); 2165 } 2166 } 2167 #endif 2168 2169 err_exit: 2170 rtnl_unlock(); 2171 return err; 2172 } 2173 2174 /* 2175 * Manual configuration of address on an interface 2176 */ 2177 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2178 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2179 __u32 valid_lft) 2180 { 2181 struct inet6_ifaddr *ifp; 2182 struct inet6_dev *idev; 2183 struct net_device *dev; 2184 int scope; 2185 u32 flags; 2186 clock_t expires; 2187 unsigned long timeout; 2188 2189 ASSERT_RTNL(); 2190 2191 if (plen > 128) 2192 return -EINVAL; 2193 2194 /* check the lifetime */ 2195 if (!valid_lft || prefered_lft > valid_lft) 2196 return -EINVAL; 2197 2198 dev = __dev_get_by_index(net, ifindex); 2199 if (!dev) 2200 return -ENODEV; 2201 2202 idev = addrconf_add_dev(dev); 2203 if (IS_ERR(idev)) 2204 return PTR_ERR(idev); 2205 2206 scope = ipv6_addr_scope(pfx); 2207 2208 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2209 if (addrconf_finite_timeout(timeout)) { 2210 expires = jiffies_to_clock_t(timeout * HZ); 2211 valid_lft = timeout; 2212 flags = RTF_EXPIRES; 2213 } else { 2214 expires = 0; 2215 flags = 0; 2216 ifa_flags |= IFA_F_PERMANENT; 2217 } 2218 2219 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2220 if (addrconf_finite_timeout(timeout)) { 2221 if (timeout == 0) 2222 ifa_flags |= IFA_F_DEPRECATED; 2223 prefered_lft = timeout; 2224 } 2225 2226 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2227 2228 if (!IS_ERR(ifp)) { 2229 spin_lock_bh(&ifp->lock); 2230 ifp->valid_lft = valid_lft; 2231 ifp->prefered_lft = prefered_lft; 2232 ifp->tstamp = jiffies; 2233 spin_unlock_bh(&ifp->lock); 2234 2235 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2236 expires, flags); 2237 /* 2238 * Note that section 3.1 of RFC 4429 indicates 2239 * that the Optimistic flag should not be set for 2240 * manually configured addresses 2241 */ 2242 addrconf_dad_start(ifp); 2243 in6_ifa_put(ifp); 2244 addrconf_verify(0); 2245 return 0; 2246 } 2247 2248 return PTR_ERR(ifp); 2249 } 2250 2251 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2252 unsigned int plen) 2253 { 2254 struct inet6_ifaddr *ifp; 2255 struct inet6_dev *idev; 2256 struct net_device *dev; 2257 2258 if (plen > 128) 2259 return -EINVAL; 2260 2261 dev = __dev_get_by_index(net, ifindex); 2262 if (!dev) 2263 return -ENODEV; 2264 2265 if ((idev = __in6_dev_get(dev)) == NULL) 2266 return -ENXIO; 2267 2268 read_lock_bh(&idev->lock); 2269 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2270 if (ifp->prefix_len == plen && 2271 ipv6_addr_equal(pfx, &ifp->addr)) { 2272 in6_ifa_hold(ifp); 2273 read_unlock_bh(&idev->lock); 2274 2275 ipv6_del_addr(ifp); 2276 2277 /* If the last address is deleted administratively, 2278 disable IPv6 on this interface. 2279 */ 2280 if (list_empty(&idev->addr_list)) 2281 addrconf_ifdown(idev->dev, 1); 2282 return 0; 2283 } 2284 } 2285 read_unlock_bh(&idev->lock); 2286 return -EADDRNOTAVAIL; 2287 } 2288 2289 2290 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2291 { 2292 struct in6_ifreq ireq; 2293 int err; 2294 2295 if (!capable(CAP_NET_ADMIN)) 2296 return -EPERM; 2297 2298 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2299 return -EFAULT; 2300 2301 rtnl_lock(); 2302 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2303 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2304 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2305 rtnl_unlock(); 2306 return err; 2307 } 2308 2309 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2310 { 2311 struct in6_ifreq ireq; 2312 int err; 2313 2314 if (!capable(CAP_NET_ADMIN)) 2315 return -EPERM; 2316 2317 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2318 return -EFAULT; 2319 2320 rtnl_lock(); 2321 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2322 ireq.ifr6_prefixlen); 2323 rtnl_unlock(); 2324 return err; 2325 } 2326 2327 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2328 int plen, int scope) 2329 { 2330 struct inet6_ifaddr *ifp; 2331 2332 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2333 if (!IS_ERR(ifp)) { 2334 spin_lock_bh(&ifp->lock); 2335 ifp->flags &= ~IFA_F_TENTATIVE; 2336 spin_unlock_bh(&ifp->lock); 2337 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2338 in6_ifa_put(ifp); 2339 } 2340 } 2341 2342 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2343 static void sit_add_v4_addrs(struct inet6_dev *idev) 2344 { 2345 struct in6_addr addr; 2346 struct net_device *dev; 2347 struct net *net = dev_net(idev->dev); 2348 int scope; 2349 2350 ASSERT_RTNL(); 2351 2352 memset(&addr, 0, sizeof(struct in6_addr)); 2353 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2354 2355 if (idev->dev->flags&IFF_POINTOPOINT) { 2356 addr.s6_addr32[0] = htonl(0xfe800000); 2357 scope = IFA_LINK; 2358 } else { 2359 scope = IPV6_ADDR_COMPATv4; 2360 } 2361 2362 if (addr.s6_addr32[3]) { 2363 add_addr(idev, &addr, 128, scope); 2364 return; 2365 } 2366 2367 for_each_netdev(net, dev) { 2368 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2369 if (in_dev && (dev->flags & IFF_UP)) { 2370 struct in_ifaddr *ifa; 2371 2372 int flag = scope; 2373 2374 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2375 int plen; 2376 2377 addr.s6_addr32[3] = ifa->ifa_local; 2378 2379 if (ifa->ifa_scope == RT_SCOPE_LINK) 2380 continue; 2381 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2382 if (idev->dev->flags&IFF_POINTOPOINT) 2383 continue; 2384 flag |= IFA_HOST; 2385 } 2386 if (idev->dev->flags&IFF_POINTOPOINT) 2387 plen = 64; 2388 else 2389 plen = 96; 2390 2391 add_addr(idev, &addr, plen, flag); 2392 } 2393 } 2394 } 2395 } 2396 #endif 2397 2398 static void init_loopback(struct net_device *dev) 2399 { 2400 struct inet6_dev *idev; 2401 2402 /* ::1 */ 2403 2404 ASSERT_RTNL(); 2405 2406 if ((idev = ipv6_find_idev(dev)) == NULL) { 2407 pr_debug("%s: add_dev failed\n", __func__); 2408 return; 2409 } 2410 2411 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2412 } 2413 2414 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2415 { 2416 struct inet6_ifaddr *ifp; 2417 u32 addr_flags = IFA_F_PERMANENT; 2418 2419 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2420 if (idev->cnf.optimistic_dad && 2421 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2422 addr_flags |= IFA_F_OPTIMISTIC; 2423 #endif 2424 2425 2426 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2427 if (!IS_ERR(ifp)) { 2428 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2429 addrconf_dad_start(ifp); 2430 in6_ifa_put(ifp); 2431 } 2432 } 2433 2434 static void addrconf_dev_config(struct net_device *dev) 2435 { 2436 struct in6_addr addr; 2437 struct inet6_dev *idev; 2438 2439 ASSERT_RTNL(); 2440 2441 if ((dev->type != ARPHRD_ETHER) && 2442 (dev->type != ARPHRD_FDDI) && 2443 (dev->type != ARPHRD_ARCNET) && 2444 (dev->type != ARPHRD_INFINIBAND) && 2445 (dev->type != ARPHRD_IEEE802154)) { 2446 /* Alas, we support only Ethernet autoconfiguration. */ 2447 return; 2448 } 2449 2450 idev = addrconf_add_dev(dev); 2451 if (IS_ERR(idev)) 2452 return; 2453 2454 memset(&addr, 0, sizeof(struct in6_addr)); 2455 addr.s6_addr32[0] = htonl(0xFE800000); 2456 2457 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2458 addrconf_add_linklocal(idev, &addr); 2459 } 2460 2461 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2462 static void addrconf_sit_config(struct net_device *dev) 2463 { 2464 struct inet6_dev *idev; 2465 2466 ASSERT_RTNL(); 2467 2468 /* 2469 * Configure the tunnel with one of our IPv4 2470 * addresses... we should configure all of 2471 * our v4 addrs in the tunnel 2472 */ 2473 2474 if ((idev = ipv6_find_idev(dev)) == NULL) { 2475 pr_debug("%s: add_dev failed\n", __func__); 2476 return; 2477 } 2478 2479 if (dev->priv_flags & IFF_ISATAP) { 2480 struct in6_addr addr; 2481 2482 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2483 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2484 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2485 addrconf_add_linklocal(idev, &addr); 2486 return; 2487 } 2488 2489 sit_add_v4_addrs(idev); 2490 2491 if (dev->flags&IFF_POINTOPOINT) { 2492 addrconf_add_mroute(dev); 2493 addrconf_add_lroute(dev); 2494 } else 2495 sit_route_add(dev); 2496 } 2497 #endif 2498 2499 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2500 static void addrconf_gre_config(struct net_device *dev) 2501 { 2502 struct inet6_dev *idev; 2503 struct in6_addr addr; 2504 2505 pr_info("%s(%s)\n", __func__, dev->name); 2506 2507 ASSERT_RTNL(); 2508 2509 if ((idev = ipv6_find_idev(dev)) == NULL) { 2510 pr_debug("%s: add_dev failed\n", __func__); 2511 return; 2512 } 2513 2514 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2515 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2516 2517 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2518 addrconf_add_linklocal(idev, &addr); 2519 } 2520 #endif 2521 2522 static inline int 2523 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2524 { 2525 struct in6_addr lladdr; 2526 2527 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2528 addrconf_add_linklocal(idev, &lladdr); 2529 return 0; 2530 } 2531 return -1; 2532 } 2533 2534 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2535 { 2536 struct net_device *link_dev; 2537 struct net *net = dev_net(idev->dev); 2538 2539 /* first try to inherit the link-local address from the link device */ 2540 if (idev->dev->iflink && 2541 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2542 if (!ipv6_inherit_linklocal(idev, link_dev)) 2543 return; 2544 } 2545 /* then try to inherit it from any device */ 2546 for_each_netdev(net, link_dev) { 2547 if (!ipv6_inherit_linklocal(idev, link_dev)) 2548 return; 2549 } 2550 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2551 } 2552 2553 /* 2554 * Autoconfigure tunnel with a link-local address so routing protocols, 2555 * DHCPv6, MLD etc. can be run over the virtual link 2556 */ 2557 2558 static void addrconf_ip6_tnl_config(struct net_device *dev) 2559 { 2560 struct inet6_dev *idev; 2561 2562 ASSERT_RTNL(); 2563 2564 idev = addrconf_add_dev(dev); 2565 if (IS_ERR(idev)) { 2566 pr_debug("init ip6-ip6: add_dev failed\n"); 2567 return; 2568 } 2569 ip6_tnl_add_linklocal(idev); 2570 } 2571 2572 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2573 void *data) 2574 { 2575 struct net_device *dev = (struct net_device *) data; 2576 struct inet6_dev *idev = __in6_dev_get(dev); 2577 int run_pending = 0; 2578 int err; 2579 2580 switch (event) { 2581 case NETDEV_REGISTER: 2582 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2583 idev = ipv6_add_dev(dev); 2584 if (!idev) 2585 return notifier_from_errno(-ENOMEM); 2586 } 2587 break; 2588 2589 case NETDEV_UP: 2590 case NETDEV_CHANGE: 2591 if (dev->flags & IFF_SLAVE) 2592 break; 2593 2594 if (event == NETDEV_UP) { 2595 if (!addrconf_qdisc_ok(dev)) { 2596 /* device is not ready yet. */ 2597 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2598 dev->name); 2599 break; 2600 } 2601 2602 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2603 idev = ipv6_add_dev(dev); 2604 2605 if (idev) { 2606 idev->if_flags |= IF_READY; 2607 run_pending = 1; 2608 } 2609 } else { 2610 if (!addrconf_qdisc_ok(dev)) { 2611 /* device is still not ready. */ 2612 break; 2613 } 2614 2615 if (idev) { 2616 if (idev->if_flags & IF_READY) 2617 /* device is already configured. */ 2618 break; 2619 idev->if_flags |= IF_READY; 2620 } 2621 2622 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2623 dev->name); 2624 2625 run_pending = 1; 2626 } 2627 2628 switch (dev->type) { 2629 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2630 case ARPHRD_SIT: 2631 addrconf_sit_config(dev); 2632 break; 2633 #endif 2634 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2635 case ARPHRD_IPGRE: 2636 addrconf_gre_config(dev); 2637 break; 2638 #endif 2639 case ARPHRD_TUNNEL6: 2640 addrconf_ip6_tnl_config(dev); 2641 break; 2642 case ARPHRD_LOOPBACK: 2643 init_loopback(dev); 2644 break; 2645 2646 default: 2647 addrconf_dev_config(dev); 2648 break; 2649 } 2650 2651 if (idev) { 2652 if (run_pending) 2653 addrconf_dad_run(idev); 2654 2655 /* 2656 * If the MTU changed during the interface down, 2657 * when the interface up, the changed MTU must be 2658 * reflected in the idev as well as routers. 2659 */ 2660 if (idev->cnf.mtu6 != dev->mtu && 2661 dev->mtu >= IPV6_MIN_MTU) { 2662 rt6_mtu_change(dev, dev->mtu); 2663 idev->cnf.mtu6 = dev->mtu; 2664 } 2665 idev->tstamp = jiffies; 2666 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2667 2668 /* 2669 * If the changed mtu during down is lower than 2670 * IPV6_MIN_MTU stop IPv6 on this interface. 2671 */ 2672 if (dev->mtu < IPV6_MIN_MTU) 2673 addrconf_ifdown(dev, 1); 2674 } 2675 break; 2676 2677 case NETDEV_CHANGEMTU: 2678 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2679 rt6_mtu_change(dev, dev->mtu); 2680 idev->cnf.mtu6 = dev->mtu; 2681 break; 2682 } 2683 2684 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2685 idev = ipv6_add_dev(dev); 2686 if (idev) 2687 break; 2688 } 2689 2690 /* 2691 * MTU falled under IPV6_MIN_MTU. 2692 * Stop IPv6 on this interface. 2693 */ 2694 2695 case NETDEV_DOWN: 2696 case NETDEV_UNREGISTER: 2697 /* 2698 * Remove all addresses from this interface. 2699 */ 2700 addrconf_ifdown(dev, event != NETDEV_DOWN); 2701 break; 2702 2703 case NETDEV_CHANGENAME: 2704 if (idev) { 2705 snmp6_unregister_dev(idev); 2706 addrconf_sysctl_unregister(idev); 2707 addrconf_sysctl_register(idev); 2708 err = snmp6_register_dev(idev); 2709 if (err) 2710 return notifier_from_errno(err); 2711 } 2712 break; 2713 2714 case NETDEV_PRE_TYPE_CHANGE: 2715 case NETDEV_POST_TYPE_CHANGE: 2716 addrconf_type_change(dev, event); 2717 break; 2718 } 2719 2720 return NOTIFY_OK; 2721 } 2722 2723 /* 2724 * addrconf module should be notified of a device going up 2725 */ 2726 static struct notifier_block ipv6_dev_notf = { 2727 .notifier_call = addrconf_notify, 2728 }; 2729 2730 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2731 { 2732 struct inet6_dev *idev; 2733 ASSERT_RTNL(); 2734 2735 idev = __in6_dev_get(dev); 2736 2737 if (event == NETDEV_POST_TYPE_CHANGE) 2738 ipv6_mc_remap(idev); 2739 else if (event == NETDEV_PRE_TYPE_CHANGE) 2740 ipv6_mc_unmap(idev); 2741 } 2742 2743 static int addrconf_ifdown(struct net_device *dev, int how) 2744 { 2745 struct net *net = dev_net(dev); 2746 struct inet6_dev *idev; 2747 struct inet6_ifaddr *ifa; 2748 int state, i; 2749 2750 ASSERT_RTNL(); 2751 2752 rt6_ifdown(net, dev); 2753 neigh_ifdown(&nd_tbl, dev); 2754 2755 idev = __in6_dev_get(dev); 2756 if (idev == NULL) 2757 return -ENODEV; 2758 2759 /* 2760 * Step 1: remove reference to ipv6 device from parent device. 2761 * Do not dev_put! 2762 */ 2763 if (how) { 2764 idev->dead = 1; 2765 2766 /* protected by rtnl_lock */ 2767 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2768 2769 /* Step 1.5: remove snmp6 entry */ 2770 snmp6_unregister_dev(idev); 2771 2772 } 2773 2774 /* Step 2: clear hash table */ 2775 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2776 struct hlist_head *h = &inet6_addr_lst[i]; 2777 struct hlist_node *n; 2778 2779 spin_lock_bh(&addrconf_hash_lock); 2780 restart: 2781 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2782 if (ifa->idev == idev) { 2783 hlist_del_init_rcu(&ifa->addr_lst); 2784 addrconf_del_timer(ifa); 2785 goto restart; 2786 } 2787 } 2788 spin_unlock_bh(&addrconf_hash_lock); 2789 } 2790 2791 write_lock_bh(&idev->lock); 2792 2793 /* Step 2: clear flags for stateless addrconf */ 2794 if (!how) 2795 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2796 2797 #ifdef CONFIG_IPV6_PRIVACY 2798 if (how && del_timer(&idev->regen_timer)) 2799 in6_dev_put(idev); 2800 2801 /* Step 3: clear tempaddr list */ 2802 while (!list_empty(&idev->tempaddr_list)) { 2803 ifa = list_first_entry(&idev->tempaddr_list, 2804 struct inet6_ifaddr, tmp_list); 2805 list_del(&ifa->tmp_list); 2806 write_unlock_bh(&idev->lock); 2807 spin_lock_bh(&ifa->lock); 2808 2809 if (ifa->ifpub) { 2810 in6_ifa_put(ifa->ifpub); 2811 ifa->ifpub = NULL; 2812 } 2813 spin_unlock_bh(&ifa->lock); 2814 in6_ifa_put(ifa); 2815 write_lock_bh(&idev->lock); 2816 } 2817 #endif 2818 2819 while (!list_empty(&idev->addr_list)) { 2820 ifa = list_first_entry(&idev->addr_list, 2821 struct inet6_ifaddr, if_list); 2822 addrconf_del_timer(ifa); 2823 2824 list_del(&ifa->if_list); 2825 2826 write_unlock_bh(&idev->lock); 2827 2828 spin_lock_bh(&ifa->state_lock); 2829 state = ifa->state; 2830 ifa->state = INET6_IFADDR_STATE_DEAD; 2831 spin_unlock_bh(&ifa->state_lock); 2832 2833 if (state != INET6_IFADDR_STATE_DEAD) { 2834 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2835 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2836 } 2837 in6_ifa_put(ifa); 2838 2839 write_lock_bh(&idev->lock); 2840 } 2841 2842 write_unlock_bh(&idev->lock); 2843 2844 /* Step 5: Discard multicast list */ 2845 if (how) 2846 ipv6_mc_destroy_dev(idev); 2847 else 2848 ipv6_mc_down(idev); 2849 2850 idev->tstamp = jiffies; 2851 2852 /* Last: Shot the device (if unregistered) */ 2853 if (how) { 2854 addrconf_sysctl_unregister(idev); 2855 neigh_parms_release(&nd_tbl, idev->nd_parms); 2856 neigh_ifdown(&nd_tbl, dev); 2857 in6_dev_put(idev); 2858 } 2859 return 0; 2860 } 2861 2862 static void addrconf_rs_timer(unsigned long data) 2863 { 2864 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2865 struct inet6_dev *idev = ifp->idev; 2866 2867 read_lock(&idev->lock); 2868 if (idev->dead || !(idev->if_flags & IF_READY)) 2869 goto out; 2870 2871 if (idev->cnf.forwarding) 2872 goto out; 2873 2874 /* Announcement received after solicitation was sent */ 2875 if (idev->if_flags & IF_RA_RCVD) 2876 goto out; 2877 2878 spin_lock(&ifp->lock); 2879 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2880 /* The wait after the last probe can be shorter */ 2881 addrconf_mod_timer(ifp, AC_RS, 2882 (ifp->probes == idev->cnf.rtr_solicits) ? 2883 idev->cnf.rtr_solicit_delay : 2884 idev->cnf.rtr_solicit_interval); 2885 spin_unlock(&ifp->lock); 2886 2887 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2888 } else { 2889 spin_unlock(&ifp->lock); 2890 /* 2891 * Note: we do not support deprecated "all on-link" 2892 * assumption any longer. 2893 */ 2894 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 2895 } 2896 2897 out: 2898 read_unlock(&idev->lock); 2899 in6_ifa_put(ifp); 2900 } 2901 2902 /* 2903 * Duplicate Address Detection 2904 */ 2905 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2906 { 2907 unsigned long rand_num; 2908 struct inet6_dev *idev = ifp->idev; 2909 2910 if (ifp->flags & IFA_F_OPTIMISTIC) 2911 rand_num = 0; 2912 else 2913 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2914 2915 ifp->probes = idev->cnf.dad_transmits; 2916 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2917 } 2918 2919 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 2920 { 2921 struct inet6_dev *idev = ifp->idev; 2922 struct net_device *dev = idev->dev; 2923 2924 addrconf_join_solict(dev, &ifp->addr); 2925 2926 net_srandom(ifp->addr.s6_addr32[3]); 2927 2928 read_lock_bh(&idev->lock); 2929 spin_lock(&ifp->lock); 2930 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2931 goto out; 2932 2933 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2934 idev->cnf.accept_dad < 1 || 2935 !(ifp->flags&IFA_F_TENTATIVE) || 2936 ifp->flags & IFA_F_NODAD) { 2937 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2938 spin_unlock(&ifp->lock); 2939 read_unlock_bh(&idev->lock); 2940 2941 addrconf_dad_completed(ifp); 2942 return; 2943 } 2944 2945 if (!(idev->if_flags & IF_READY)) { 2946 spin_unlock(&ifp->lock); 2947 read_unlock_bh(&idev->lock); 2948 /* 2949 * If the device is not ready: 2950 * - keep it tentative if it is a permanent address. 2951 * - otherwise, kill it. 2952 */ 2953 in6_ifa_hold(ifp); 2954 addrconf_dad_stop(ifp, 0); 2955 return; 2956 } 2957 2958 /* 2959 * Optimistic nodes can start receiving 2960 * Frames right away 2961 */ 2962 if (ifp->flags & IFA_F_OPTIMISTIC) 2963 ip6_ins_rt(ifp->rt); 2964 2965 addrconf_dad_kick(ifp); 2966 out: 2967 spin_unlock(&ifp->lock); 2968 read_unlock_bh(&idev->lock); 2969 } 2970 2971 static void addrconf_dad_timer(unsigned long data) 2972 { 2973 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2974 struct inet6_dev *idev = ifp->idev; 2975 struct in6_addr mcaddr; 2976 2977 if (!ifp->probes && addrconf_dad_end(ifp)) 2978 goto out; 2979 2980 read_lock(&idev->lock); 2981 if (idev->dead || !(idev->if_flags & IF_READY)) { 2982 read_unlock(&idev->lock); 2983 goto out; 2984 } 2985 2986 spin_lock(&ifp->lock); 2987 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2988 spin_unlock(&ifp->lock); 2989 read_unlock(&idev->lock); 2990 goto out; 2991 } 2992 2993 if (ifp->probes == 0) { 2994 /* 2995 * DAD was successful 2996 */ 2997 2998 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2999 spin_unlock(&ifp->lock); 3000 read_unlock(&idev->lock); 3001 3002 addrconf_dad_completed(ifp); 3003 3004 goto out; 3005 } 3006 3007 ifp->probes--; 3008 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3009 spin_unlock(&ifp->lock); 3010 read_unlock(&idev->lock); 3011 3012 /* send a neighbour solicitation for our addr */ 3013 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3014 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3015 out: 3016 in6_ifa_put(ifp); 3017 } 3018 3019 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3020 { 3021 struct net_device *dev = ifp->idev->dev; 3022 3023 /* 3024 * Configure the address for reception. Now it is valid. 3025 */ 3026 3027 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3028 3029 /* If added prefix is link local and we are prepared to process 3030 router advertisements, start sending router solicitations. 3031 */ 3032 3033 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) || 3034 ifp->idev->cnf.accept_ra == 2) && 3035 ifp->idev->cnf.rtr_solicits > 0 && 3036 (dev->flags&IFF_LOOPBACK) == 0 && 3037 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3038 /* 3039 * If a host as already performed a random delay 3040 * [...] as part of DAD [...] there is no need 3041 * to delay again before sending the first RS 3042 */ 3043 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3044 3045 spin_lock_bh(&ifp->lock); 3046 ifp->probes = 1; 3047 ifp->idev->if_flags |= IF_RS_SENT; 3048 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3049 spin_unlock_bh(&ifp->lock); 3050 } 3051 } 3052 3053 static void addrconf_dad_run(struct inet6_dev *idev) 3054 { 3055 struct inet6_ifaddr *ifp; 3056 3057 read_lock_bh(&idev->lock); 3058 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3059 spin_lock(&ifp->lock); 3060 if (ifp->flags & IFA_F_TENTATIVE && 3061 ifp->state == INET6_IFADDR_STATE_DAD) 3062 addrconf_dad_kick(ifp); 3063 spin_unlock(&ifp->lock); 3064 } 3065 read_unlock_bh(&idev->lock); 3066 } 3067 3068 #ifdef CONFIG_PROC_FS 3069 struct if6_iter_state { 3070 struct seq_net_private p; 3071 int bucket; 3072 int offset; 3073 }; 3074 3075 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3076 { 3077 struct inet6_ifaddr *ifa = NULL; 3078 struct if6_iter_state *state = seq->private; 3079 struct net *net = seq_file_net(seq); 3080 int p = 0; 3081 3082 /* initial bucket if pos is 0 */ 3083 if (pos == 0) { 3084 state->bucket = 0; 3085 state->offset = 0; 3086 } 3087 3088 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3089 struct hlist_node *n; 3090 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3091 addr_lst) { 3092 /* sync with offset */ 3093 if (p < state->offset) { 3094 p++; 3095 continue; 3096 } 3097 state->offset++; 3098 if (net_eq(dev_net(ifa->idev->dev), net)) 3099 return ifa; 3100 } 3101 3102 /* prepare for next bucket */ 3103 state->offset = 0; 3104 p = 0; 3105 } 3106 return NULL; 3107 } 3108 3109 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3110 struct inet6_ifaddr *ifa) 3111 { 3112 struct if6_iter_state *state = seq->private; 3113 struct net *net = seq_file_net(seq); 3114 struct hlist_node *n = &ifa->addr_lst; 3115 3116 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) { 3117 state->offset++; 3118 if (net_eq(dev_net(ifa->idev->dev), net)) 3119 return ifa; 3120 } 3121 3122 while (++state->bucket < IN6_ADDR_HSIZE) { 3123 state->offset = 0; 3124 hlist_for_each_entry_rcu_bh(ifa, n, 3125 &inet6_addr_lst[state->bucket], addr_lst) { 3126 state->offset++; 3127 if (net_eq(dev_net(ifa->idev->dev), net)) 3128 return ifa; 3129 } 3130 } 3131 3132 return NULL; 3133 } 3134 3135 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3136 __acquires(rcu_bh) 3137 { 3138 rcu_read_lock_bh(); 3139 return if6_get_first(seq, *pos); 3140 } 3141 3142 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3143 { 3144 struct inet6_ifaddr *ifa; 3145 3146 ifa = if6_get_next(seq, v); 3147 ++*pos; 3148 return ifa; 3149 } 3150 3151 static void if6_seq_stop(struct seq_file *seq, void *v) 3152 __releases(rcu_bh) 3153 { 3154 rcu_read_unlock_bh(); 3155 } 3156 3157 static int if6_seq_show(struct seq_file *seq, void *v) 3158 { 3159 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3160 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3161 &ifp->addr, 3162 ifp->idev->dev->ifindex, 3163 ifp->prefix_len, 3164 ifp->scope, 3165 ifp->flags, 3166 ifp->idev->dev->name); 3167 return 0; 3168 } 3169 3170 static const struct seq_operations if6_seq_ops = { 3171 .start = if6_seq_start, 3172 .next = if6_seq_next, 3173 .show = if6_seq_show, 3174 .stop = if6_seq_stop, 3175 }; 3176 3177 static int if6_seq_open(struct inode *inode, struct file *file) 3178 { 3179 return seq_open_net(inode, file, &if6_seq_ops, 3180 sizeof(struct if6_iter_state)); 3181 } 3182 3183 static const struct file_operations if6_fops = { 3184 .owner = THIS_MODULE, 3185 .open = if6_seq_open, 3186 .read = seq_read, 3187 .llseek = seq_lseek, 3188 .release = seq_release_net, 3189 }; 3190 3191 static int __net_init if6_proc_net_init(struct net *net) 3192 { 3193 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3194 return -ENOMEM; 3195 return 0; 3196 } 3197 3198 static void __net_exit if6_proc_net_exit(struct net *net) 3199 { 3200 proc_net_remove(net, "if_inet6"); 3201 } 3202 3203 static struct pernet_operations if6_proc_net_ops = { 3204 .init = if6_proc_net_init, 3205 .exit = if6_proc_net_exit, 3206 }; 3207 3208 int __init if6_proc_init(void) 3209 { 3210 return register_pernet_subsys(&if6_proc_net_ops); 3211 } 3212 3213 void if6_proc_exit(void) 3214 { 3215 unregister_pernet_subsys(&if6_proc_net_ops); 3216 } 3217 #endif /* CONFIG_PROC_FS */ 3218 3219 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3220 /* Check if address is a home address configured on any interface. */ 3221 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3222 { 3223 int ret = 0; 3224 struct inet6_ifaddr *ifp = NULL; 3225 struct hlist_node *n; 3226 unsigned int hash = ipv6_addr_hash(addr); 3227 3228 rcu_read_lock_bh(); 3229 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3230 if (!net_eq(dev_net(ifp->idev->dev), net)) 3231 continue; 3232 if (ipv6_addr_equal(&ifp->addr, addr) && 3233 (ifp->flags & IFA_F_HOMEADDRESS)) { 3234 ret = 1; 3235 break; 3236 } 3237 } 3238 rcu_read_unlock_bh(); 3239 return ret; 3240 } 3241 #endif 3242 3243 /* 3244 * Periodic address status verification 3245 */ 3246 3247 static void addrconf_verify(unsigned long foo) 3248 { 3249 unsigned long now, next, next_sec, next_sched; 3250 struct inet6_ifaddr *ifp; 3251 struct hlist_node *node; 3252 int i; 3253 3254 rcu_read_lock_bh(); 3255 spin_lock(&addrconf_verify_lock); 3256 now = jiffies; 3257 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3258 3259 del_timer(&addr_chk_timer); 3260 3261 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3262 restart: 3263 hlist_for_each_entry_rcu_bh(ifp, node, 3264 &inet6_addr_lst[i], addr_lst) { 3265 unsigned long age; 3266 3267 if (ifp->flags & IFA_F_PERMANENT) 3268 continue; 3269 3270 spin_lock(&ifp->lock); 3271 /* We try to batch several events at once. */ 3272 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3273 3274 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3275 age >= ifp->valid_lft) { 3276 spin_unlock(&ifp->lock); 3277 in6_ifa_hold(ifp); 3278 ipv6_del_addr(ifp); 3279 goto restart; 3280 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3281 spin_unlock(&ifp->lock); 3282 continue; 3283 } else if (age >= ifp->prefered_lft) { 3284 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3285 int deprecate = 0; 3286 3287 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3288 deprecate = 1; 3289 ifp->flags |= IFA_F_DEPRECATED; 3290 } 3291 3292 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3293 next = ifp->tstamp + ifp->valid_lft * HZ; 3294 3295 spin_unlock(&ifp->lock); 3296 3297 if (deprecate) { 3298 in6_ifa_hold(ifp); 3299 3300 ipv6_ifa_notify(0, ifp); 3301 in6_ifa_put(ifp); 3302 goto restart; 3303 } 3304 #ifdef CONFIG_IPV6_PRIVACY 3305 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3306 !(ifp->flags&IFA_F_TENTATIVE)) { 3307 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3308 ifp->idev->cnf.dad_transmits * 3309 ifp->idev->nd_parms->retrans_time / HZ; 3310 3311 if (age >= ifp->prefered_lft - regen_advance) { 3312 struct inet6_ifaddr *ifpub = ifp->ifpub; 3313 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3314 next = ifp->tstamp + ifp->prefered_lft * HZ; 3315 if (!ifp->regen_count && ifpub) { 3316 ifp->regen_count++; 3317 in6_ifa_hold(ifp); 3318 in6_ifa_hold(ifpub); 3319 spin_unlock(&ifp->lock); 3320 3321 spin_lock(&ifpub->lock); 3322 ifpub->regen_count = 0; 3323 spin_unlock(&ifpub->lock); 3324 ipv6_create_tempaddr(ifpub, ifp); 3325 in6_ifa_put(ifpub); 3326 in6_ifa_put(ifp); 3327 goto restart; 3328 } 3329 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3330 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3331 spin_unlock(&ifp->lock); 3332 #endif 3333 } else { 3334 /* ifp->prefered_lft <= ifp->valid_lft */ 3335 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3336 next = ifp->tstamp + ifp->prefered_lft * HZ; 3337 spin_unlock(&ifp->lock); 3338 } 3339 } 3340 } 3341 3342 next_sec = round_jiffies_up(next); 3343 next_sched = next; 3344 3345 /* If rounded timeout is accurate enough, accept it. */ 3346 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3347 next_sched = next_sec; 3348 3349 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3350 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3351 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3352 3353 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3354 now, next, next_sec, next_sched)); 3355 3356 addr_chk_timer.expires = next_sched; 3357 add_timer(&addr_chk_timer); 3358 spin_unlock(&addrconf_verify_lock); 3359 rcu_read_unlock_bh(); 3360 } 3361 3362 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3363 { 3364 struct in6_addr *pfx = NULL; 3365 3366 if (addr) 3367 pfx = nla_data(addr); 3368 3369 if (local) { 3370 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3371 pfx = NULL; 3372 else 3373 pfx = nla_data(local); 3374 } 3375 3376 return pfx; 3377 } 3378 3379 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3380 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3381 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3382 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3383 }; 3384 3385 static int 3386 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3387 { 3388 struct net *net = sock_net(skb->sk); 3389 struct ifaddrmsg *ifm; 3390 struct nlattr *tb[IFA_MAX+1]; 3391 struct in6_addr *pfx; 3392 int err; 3393 3394 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3395 if (err < 0) 3396 return err; 3397 3398 ifm = nlmsg_data(nlh); 3399 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3400 if (pfx == NULL) 3401 return -EINVAL; 3402 3403 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3404 } 3405 3406 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3407 u32 prefered_lft, u32 valid_lft) 3408 { 3409 u32 flags; 3410 clock_t expires; 3411 unsigned long timeout; 3412 3413 if (!valid_lft || (prefered_lft > valid_lft)) 3414 return -EINVAL; 3415 3416 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3417 if (addrconf_finite_timeout(timeout)) { 3418 expires = jiffies_to_clock_t(timeout * HZ); 3419 valid_lft = timeout; 3420 flags = RTF_EXPIRES; 3421 } else { 3422 expires = 0; 3423 flags = 0; 3424 ifa_flags |= IFA_F_PERMANENT; 3425 } 3426 3427 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3428 if (addrconf_finite_timeout(timeout)) { 3429 if (timeout == 0) 3430 ifa_flags |= IFA_F_DEPRECATED; 3431 prefered_lft = timeout; 3432 } 3433 3434 spin_lock_bh(&ifp->lock); 3435 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3436 ifp->tstamp = jiffies; 3437 ifp->valid_lft = valid_lft; 3438 ifp->prefered_lft = prefered_lft; 3439 3440 spin_unlock_bh(&ifp->lock); 3441 if (!(ifp->flags&IFA_F_TENTATIVE)) 3442 ipv6_ifa_notify(0, ifp); 3443 3444 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3445 expires, flags); 3446 addrconf_verify(0); 3447 3448 return 0; 3449 } 3450 3451 static int 3452 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3453 { 3454 struct net *net = sock_net(skb->sk); 3455 struct ifaddrmsg *ifm; 3456 struct nlattr *tb[IFA_MAX+1]; 3457 struct in6_addr *pfx; 3458 struct inet6_ifaddr *ifa; 3459 struct net_device *dev; 3460 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3461 u8 ifa_flags; 3462 int err; 3463 3464 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3465 if (err < 0) 3466 return err; 3467 3468 ifm = nlmsg_data(nlh); 3469 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3470 if (pfx == NULL) 3471 return -EINVAL; 3472 3473 if (tb[IFA_CACHEINFO]) { 3474 struct ifa_cacheinfo *ci; 3475 3476 ci = nla_data(tb[IFA_CACHEINFO]); 3477 valid_lft = ci->ifa_valid; 3478 preferred_lft = ci->ifa_prefered; 3479 } else { 3480 preferred_lft = INFINITY_LIFE_TIME; 3481 valid_lft = INFINITY_LIFE_TIME; 3482 } 3483 3484 dev = __dev_get_by_index(net, ifm->ifa_index); 3485 if (dev == NULL) 3486 return -ENODEV; 3487 3488 /* We ignore other flags so far. */ 3489 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3490 3491 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3492 if (ifa == NULL) { 3493 /* 3494 * It would be best to check for !NLM_F_CREATE here but 3495 * userspace alreay relies on not having to provide this. 3496 */ 3497 return inet6_addr_add(net, ifm->ifa_index, pfx, 3498 ifm->ifa_prefixlen, ifa_flags, 3499 preferred_lft, valid_lft); 3500 } 3501 3502 if (nlh->nlmsg_flags & NLM_F_EXCL || 3503 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3504 err = -EEXIST; 3505 else 3506 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3507 3508 in6_ifa_put(ifa); 3509 3510 return err; 3511 } 3512 3513 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3514 u8 scope, int ifindex) 3515 { 3516 struct ifaddrmsg *ifm; 3517 3518 ifm = nlmsg_data(nlh); 3519 ifm->ifa_family = AF_INET6; 3520 ifm->ifa_prefixlen = prefixlen; 3521 ifm->ifa_flags = flags; 3522 ifm->ifa_scope = scope; 3523 ifm->ifa_index = ifindex; 3524 } 3525 3526 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3527 unsigned long tstamp, u32 preferred, u32 valid) 3528 { 3529 struct ifa_cacheinfo ci; 3530 3531 ci.cstamp = cstamp_delta(cstamp); 3532 ci.tstamp = cstamp_delta(tstamp); 3533 ci.ifa_prefered = preferred; 3534 ci.ifa_valid = valid; 3535 3536 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3537 } 3538 3539 static inline int rt_scope(int ifa_scope) 3540 { 3541 if (ifa_scope & IFA_HOST) 3542 return RT_SCOPE_HOST; 3543 else if (ifa_scope & IFA_LINK) 3544 return RT_SCOPE_LINK; 3545 else if (ifa_scope & IFA_SITE) 3546 return RT_SCOPE_SITE; 3547 else 3548 return RT_SCOPE_UNIVERSE; 3549 } 3550 3551 static inline int inet6_ifaddr_msgsize(void) 3552 { 3553 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3554 + nla_total_size(16) /* IFA_ADDRESS */ 3555 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3556 } 3557 3558 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3559 u32 pid, u32 seq, int event, unsigned int flags) 3560 { 3561 struct nlmsghdr *nlh; 3562 u32 preferred, valid; 3563 3564 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3565 if (nlh == NULL) 3566 return -EMSGSIZE; 3567 3568 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3569 ifa->idev->dev->ifindex); 3570 3571 if (!(ifa->flags&IFA_F_PERMANENT)) { 3572 preferred = ifa->prefered_lft; 3573 valid = ifa->valid_lft; 3574 if (preferred != INFINITY_LIFE_TIME) { 3575 long tval = (jiffies - ifa->tstamp)/HZ; 3576 if (preferred > tval) 3577 preferred -= tval; 3578 else 3579 preferred = 0; 3580 if (valid != INFINITY_LIFE_TIME) { 3581 if (valid > tval) 3582 valid -= tval; 3583 else 3584 valid = 0; 3585 } 3586 } 3587 } else { 3588 preferred = INFINITY_LIFE_TIME; 3589 valid = INFINITY_LIFE_TIME; 3590 } 3591 3592 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3593 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3594 nlmsg_cancel(skb, nlh); 3595 return -EMSGSIZE; 3596 } 3597 3598 return nlmsg_end(skb, nlh); 3599 } 3600 3601 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3602 u32 pid, u32 seq, int event, u16 flags) 3603 { 3604 struct nlmsghdr *nlh; 3605 u8 scope = RT_SCOPE_UNIVERSE; 3606 int ifindex = ifmca->idev->dev->ifindex; 3607 3608 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3609 scope = RT_SCOPE_SITE; 3610 3611 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3612 if (nlh == NULL) 3613 return -EMSGSIZE; 3614 3615 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3616 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3617 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3618 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3619 nlmsg_cancel(skb, nlh); 3620 return -EMSGSIZE; 3621 } 3622 3623 return nlmsg_end(skb, nlh); 3624 } 3625 3626 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3627 u32 pid, u32 seq, int event, unsigned int flags) 3628 { 3629 struct nlmsghdr *nlh; 3630 u8 scope = RT_SCOPE_UNIVERSE; 3631 int ifindex = ifaca->aca_idev->dev->ifindex; 3632 3633 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3634 scope = RT_SCOPE_SITE; 3635 3636 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3637 if (nlh == NULL) 3638 return -EMSGSIZE; 3639 3640 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3641 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3642 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3643 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3644 nlmsg_cancel(skb, nlh); 3645 return -EMSGSIZE; 3646 } 3647 3648 return nlmsg_end(skb, nlh); 3649 } 3650 3651 enum addr_type_t { 3652 UNICAST_ADDR, 3653 MULTICAST_ADDR, 3654 ANYCAST_ADDR, 3655 }; 3656 3657 /* called with rcu_read_lock() */ 3658 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3659 struct netlink_callback *cb, enum addr_type_t type, 3660 int s_ip_idx, int *p_ip_idx) 3661 { 3662 struct ifmcaddr6 *ifmca; 3663 struct ifacaddr6 *ifaca; 3664 int err = 1; 3665 int ip_idx = *p_ip_idx; 3666 3667 read_lock_bh(&idev->lock); 3668 switch (type) { 3669 case UNICAST_ADDR: { 3670 struct inet6_ifaddr *ifa; 3671 3672 /* unicast address incl. temp addr */ 3673 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3674 if (++ip_idx < s_ip_idx) 3675 continue; 3676 err = inet6_fill_ifaddr(skb, ifa, 3677 NETLINK_CB(cb->skb).pid, 3678 cb->nlh->nlmsg_seq, 3679 RTM_NEWADDR, 3680 NLM_F_MULTI); 3681 if (err <= 0) 3682 break; 3683 } 3684 break; 3685 } 3686 case MULTICAST_ADDR: 3687 /* multicast address */ 3688 for (ifmca = idev->mc_list; ifmca; 3689 ifmca = ifmca->next, ip_idx++) { 3690 if (ip_idx < s_ip_idx) 3691 continue; 3692 err = inet6_fill_ifmcaddr(skb, ifmca, 3693 NETLINK_CB(cb->skb).pid, 3694 cb->nlh->nlmsg_seq, 3695 RTM_GETMULTICAST, 3696 NLM_F_MULTI); 3697 if (err <= 0) 3698 break; 3699 } 3700 break; 3701 case ANYCAST_ADDR: 3702 /* anycast address */ 3703 for (ifaca = idev->ac_list; ifaca; 3704 ifaca = ifaca->aca_next, ip_idx++) { 3705 if (ip_idx < s_ip_idx) 3706 continue; 3707 err = inet6_fill_ifacaddr(skb, ifaca, 3708 NETLINK_CB(cb->skb).pid, 3709 cb->nlh->nlmsg_seq, 3710 RTM_GETANYCAST, 3711 NLM_F_MULTI); 3712 if (err <= 0) 3713 break; 3714 } 3715 break; 3716 default: 3717 break; 3718 } 3719 read_unlock_bh(&idev->lock); 3720 *p_ip_idx = ip_idx; 3721 return err; 3722 } 3723 3724 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3725 enum addr_type_t type) 3726 { 3727 struct net *net = sock_net(skb->sk); 3728 int h, s_h; 3729 int idx, ip_idx; 3730 int s_idx, s_ip_idx; 3731 struct net_device *dev; 3732 struct inet6_dev *idev; 3733 struct hlist_head *head; 3734 struct hlist_node *node; 3735 3736 s_h = cb->args[0]; 3737 s_idx = idx = cb->args[1]; 3738 s_ip_idx = ip_idx = cb->args[2]; 3739 3740 rcu_read_lock(); 3741 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3742 idx = 0; 3743 head = &net->dev_index_head[h]; 3744 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3745 if (idx < s_idx) 3746 goto cont; 3747 if (h > s_h || idx > s_idx) 3748 s_ip_idx = 0; 3749 ip_idx = 0; 3750 idev = __in6_dev_get(dev); 3751 if (!idev) 3752 goto cont; 3753 3754 if (in6_dump_addrs(idev, skb, cb, type, 3755 s_ip_idx, &ip_idx) <= 0) 3756 goto done; 3757 cont: 3758 idx++; 3759 } 3760 } 3761 done: 3762 rcu_read_unlock(); 3763 cb->args[0] = h; 3764 cb->args[1] = idx; 3765 cb->args[2] = ip_idx; 3766 3767 return skb->len; 3768 } 3769 3770 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3771 { 3772 enum addr_type_t type = UNICAST_ADDR; 3773 3774 return inet6_dump_addr(skb, cb, type); 3775 } 3776 3777 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3778 { 3779 enum addr_type_t type = MULTICAST_ADDR; 3780 3781 return inet6_dump_addr(skb, cb, type); 3782 } 3783 3784 3785 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3786 { 3787 enum addr_type_t type = ANYCAST_ADDR; 3788 3789 return inet6_dump_addr(skb, cb, type); 3790 } 3791 3792 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 3793 void *arg) 3794 { 3795 struct net *net = sock_net(in_skb->sk); 3796 struct ifaddrmsg *ifm; 3797 struct nlattr *tb[IFA_MAX+1]; 3798 struct in6_addr *addr = NULL; 3799 struct net_device *dev = NULL; 3800 struct inet6_ifaddr *ifa; 3801 struct sk_buff *skb; 3802 int err; 3803 3804 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3805 if (err < 0) 3806 goto errout; 3807 3808 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3809 if (addr == NULL) { 3810 err = -EINVAL; 3811 goto errout; 3812 } 3813 3814 ifm = nlmsg_data(nlh); 3815 if (ifm->ifa_index) 3816 dev = __dev_get_by_index(net, ifm->ifa_index); 3817 3818 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3819 if (!ifa) { 3820 err = -EADDRNOTAVAIL; 3821 goto errout; 3822 } 3823 3824 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3825 if (!skb) { 3826 err = -ENOBUFS; 3827 goto errout_ifa; 3828 } 3829 3830 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3831 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3832 if (err < 0) { 3833 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3834 WARN_ON(err == -EMSGSIZE); 3835 kfree_skb(skb); 3836 goto errout_ifa; 3837 } 3838 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3839 errout_ifa: 3840 in6_ifa_put(ifa); 3841 errout: 3842 return err; 3843 } 3844 3845 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3846 { 3847 struct sk_buff *skb; 3848 struct net *net = dev_net(ifa->idev->dev); 3849 int err = -ENOBUFS; 3850 3851 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3852 if (skb == NULL) 3853 goto errout; 3854 3855 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3856 if (err < 0) { 3857 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3858 WARN_ON(err == -EMSGSIZE); 3859 kfree_skb(skb); 3860 goto errout; 3861 } 3862 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3863 return; 3864 errout: 3865 if (err < 0) 3866 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3867 } 3868 3869 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3870 __s32 *array, int bytes) 3871 { 3872 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3873 3874 memset(array, 0, bytes); 3875 array[DEVCONF_FORWARDING] = cnf->forwarding; 3876 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3877 array[DEVCONF_MTU6] = cnf->mtu6; 3878 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3879 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3880 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3881 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3882 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3883 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3884 jiffies_to_msecs(cnf->rtr_solicit_interval); 3885 array[DEVCONF_RTR_SOLICIT_DELAY] = 3886 jiffies_to_msecs(cnf->rtr_solicit_delay); 3887 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3888 #ifdef CONFIG_IPV6_PRIVACY 3889 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3890 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3891 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3892 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3893 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3894 #endif 3895 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3896 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3897 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3898 #ifdef CONFIG_IPV6_ROUTER_PREF 3899 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3900 array[DEVCONF_RTR_PROBE_INTERVAL] = 3901 jiffies_to_msecs(cnf->rtr_probe_interval); 3902 #ifdef CONFIG_IPV6_ROUTE_INFO 3903 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3904 #endif 3905 #endif 3906 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3907 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3908 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3909 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3910 #endif 3911 #ifdef CONFIG_IPV6_MROUTE 3912 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3913 #endif 3914 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3915 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3916 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3917 } 3918 3919 static inline size_t inet6_ifla6_size(void) 3920 { 3921 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3922 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3923 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3924 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3925 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3926 } 3927 3928 static inline size_t inet6_if_nlmsg_size(void) 3929 { 3930 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3931 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3932 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3933 + nla_total_size(4) /* IFLA_MTU */ 3934 + nla_total_size(4) /* IFLA_LINK */ 3935 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3936 } 3937 3938 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3939 int items, int bytes) 3940 { 3941 int i; 3942 int pad = bytes - sizeof(u64) * items; 3943 BUG_ON(pad < 0); 3944 3945 /* Use put_unaligned() because stats may not be aligned for u64. */ 3946 put_unaligned(items, &stats[0]); 3947 for (i = 1; i < items; i++) 3948 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3949 3950 memset(&stats[items], 0, pad); 3951 } 3952 3953 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3954 int items, int bytes, size_t syncpoff) 3955 { 3956 int i; 3957 int pad = bytes - sizeof(u64) * items; 3958 BUG_ON(pad < 0); 3959 3960 /* Use put_unaligned() because stats may not be aligned for u64. */ 3961 put_unaligned(items, &stats[0]); 3962 for (i = 1; i < items; i++) 3963 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3964 3965 memset(&stats[items], 0, pad); 3966 } 3967 3968 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3969 int bytes) 3970 { 3971 switch (attrtype) { 3972 case IFLA_INET6_STATS: 3973 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3974 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3975 break; 3976 case IFLA_INET6_ICMP6STATS: 3977 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3978 break; 3979 } 3980 } 3981 3982 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3983 { 3984 struct nlattr *nla; 3985 struct ifla_cacheinfo ci; 3986 3987 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 3988 goto nla_put_failure; 3989 ci.max_reasm_len = IPV6_MAXPLEN; 3990 ci.tstamp = cstamp_delta(idev->tstamp); 3991 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3992 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3993 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 3994 goto nla_put_failure; 3995 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3996 if (nla == NULL) 3997 goto nla_put_failure; 3998 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3999 4000 /* XXX - MC not implemented */ 4001 4002 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4003 if (nla == NULL) 4004 goto nla_put_failure; 4005 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4006 4007 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4008 if (nla == NULL) 4009 goto nla_put_failure; 4010 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4011 4012 return 0; 4013 4014 nla_put_failure: 4015 return -EMSGSIZE; 4016 } 4017 4018 static size_t inet6_get_link_af_size(const struct net_device *dev) 4019 { 4020 if (!__in6_dev_get(dev)) 4021 return 0; 4022 4023 return inet6_ifla6_size(); 4024 } 4025 4026 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4027 { 4028 struct inet6_dev *idev = __in6_dev_get(dev); 4029 4030 if (!idev) 4031 return -ENODATA; 4032 4033 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4034 return -EMSGSIZE; 4035 4036 return 0; 4037 } 4038 4039 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4040 u32 pid, u32 seq, int event, unsigned int flags) 4041 { 4042 struct net_device *dev = idev->dev; 4043 struct ifinfomsg *hdr; 4044 struct nlmsghdr *nlh; 4045 void *protoinfo; 4046 4047 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 4048 if (nlh == NULL) 4049 return -EMSGSIZE; 4050 4051 hdr = nlmsg_data(nlh); 4052 hdr->ifi_family = AF_INET6; 4053 hdr->__ifi_pad = 0; 4054 hdr->ifi_type = dev->type; 4055 hdr->ifi_index = dev->ifindex; 4056 hdr->ifi_flags = dev_get_flags(dev); 4057 hdr->ifi_change = 0; 4058 4059 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4060 (dev->addr_len && 4061 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4062 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4063 (dev->ifindex != dev->iflink && 4064 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4065 goto nla_put_failure; 4066 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4067 if (protoinfo == NULL) 4068 goto nla_put_failure; 4069 4070 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4071 goto nla_put_failure; 4072 4073 nla_nest_end(skb, protoinfo); 4074 return nlmsg_end(skb, nlh); 4075 4076 nla_put_failure: 4077 nlmsg_cancel(skb, nlh); 4078 return -EMSGSIZE; 4079 } 4080 4081 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4082 { 4083 struct net *net = sock_net(skb->sk); 4084 int h, s_h; 4085 int idx = 0, s_idx; 4086 struct net_device *dev; 4087 struct inet6_dev *idev; 4088 struct hlist_head *head; 4089 struct hlist_node *node; 4090 4091 s_h = cb->args[0]; 4092 s_idx = cb->args[1]; 4093 4094 rcu_read_lock(); 4095 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4096 idx = 0; 4097 head = &net->dev_index_head[h]; 4098 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4099 if (idx < s_idx) 4100 goto cont; 4101 idev = __in6_dev_get(dev); 4102 if (!idev) 4103 goto cont; 4104 if (inet6_fill_ifinfo(skb, idev, 4105 NETLINK_CB(cb->skb).pid, 4106 cb->nlh->nlmsg_seq, 4107 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4108 goto out; 4109 cont: 4110 idx++; 4111 } 4112 } 4113 out: 4114 rcu_read_unlock(); 4115 cb->args[1] = idx; 4116 cb->args[0] = h; 4117 4118 return skb->len; 4119 } 4120 4121 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4122 { 4123 struct sk_buff *skb; 4124 struct net *net = dev_net(idev->dev); 4125 int err = -ENOBUFS; 4126 4127 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4128 if (skb == NULL) 4129 goto errout; 4130 4131 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4132 if (err < 0) { 4133 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4134 WARN_ON(err == -EMSGSIZE); 4135 kfree_skb(skb); 4136 goto errout; 4137 } 4138 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4139 return; 4140 errout: 4141 if (err < 0) 4142 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4143 } 4144 4145 static inline size_t inet6_prefix_nlmsg_size(void) 4146 { 4147 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4148 + nla_total_size(sizeof(struct in6_addr)) 4149 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4150 } 4151 4152 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4153 struct prefix_info *pinfo, u32 pid, u32 seq, 4154 int event, unsigned int flags) 4155 { 4156 struct prefixmsg *pmsg; 4157 struct nlmsghdr *nlh; 4158 struct prefix_cacheinfo ci; 4159 4160 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4161 if (nlh == NULL) 4162 return -EMSGSIZE; 4163 4164 pmsg = nlmsg_data(nlh); 4165 pmsg->prefix_family = AF_INET6; 4166 pmsg->prefix_pad1 = 0; 4167 pmsg->prefix_pad2 = 0; 4168 pmsg->prefix_ifindex = idev->dev->ifindex; 4169 pmsg->prefix_len = pinfo->prefix_len; 4170 pmsg->prefix_type = pinfo->type; 4171 pmsg->prefix_pad3 = 0; 4172 pmsg->prefix_flags = 0; 4173 if (pinfo->onlink) 4174 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4175 if (pinfo->autoconf) 4176 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4177 4178 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4179 goto nla_put_failure; 4180 ci.preferred_time = ntohl(pinfo->prefered); 4181 ci.valid_time = ntohl(pinfo->valid); 4182 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4183 goto nla_put_failure; 4184 return nlmsg_end(skb, nlh); 4185 4186 nla_put_failure: 4187 nlmsg_cancel(skb, nlh); 4188 return -EMSGSIZE; 4189 } 4190 4191 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4192 struct prefix_info *pinfo) 4193 { 4194 struct sk_buff *skb; 4195 struct net *net = dev_net(idev->dev); 4196 int err = -ENOBUFS; 4197 4198 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4199 if (skb == NULL) 4200 goto errout; 4201 4202 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4203 if (err < 0) { 4204 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4205 WARN_ON(err == -EMSGSIZE); 4206 kfree_skb(skb); 4207 goto errout; 4208 } 4209 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4210 return; 4211 errout: 4212 if (err < 0) 4213 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4214 } 4215 4216 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4217 { 4218 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4219 4220 switch (event) { 4221 case RTM_NEWADDR: 4222 /* 4223 * If the address was optimistic 4224 * we inserted the route at the start of 4225 * our DAD process, so we don't need 4226 * to do it again 4227 */ 4228 if (!(ifp->rt->rt6i_node)) 4229 ip6_ins_rt(ifp->rt); 4230 if (ifp->idev->cnf.forwarding) 4231 addrconf_join_anycast(ifp); 4232 break; 4233 case RTM_DELADDR: 4234 if (ifp->idev->cnf.forwarding) 4235 addrconf_leave_anycast(ifp); 4236 addrconf_leave_solict(ifp->idev, &ifp->addr); 4237 dst_hold(&ifp->rt->dst); 4238 4239 if (ip6_del_rt(ifp->rt)) 4240 dst_free(&ifp->rt->dst); 4241 break; 4242 } 4243 } 4244 4245 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4246 { 4247 rcu_read_lock_bh(); 4248 if (likely(ifp->idev->dead == 0)) 4249 __ipv6_ifa_notify(event, ifp); 4250 rcu_read_unlock_bh(); 4251 } 4252 4253 #ifdef CONFIG_SYSCTL 4254 4255 static 4256 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4257 void __user *buffer, size_t *lenp, loff_t *ppos) 4258 { 4259 int *valp = ctl->data; 4260 int val = *valp; 4261 loff_t pos = *ppos; 4262 ctl_table lctl; 4263 int ret; 4264 4265 /* 4266 * ctl->data points to idev->cnf.forwarding, we should 4267 * not modify it until we get the rtnl lock. 4268 */ 4269 lctl = *ctl; 4270 lctl.data = &val; 4271 4272 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4273 4274 if (write) 4275 ret = addrconf_fixup_forwarding(ctl, valp, val); 4276 if (ret) 4277 *ppos = pos; 4278 return ret; 4279 } 4280 4281 static void dev_disable_change(struct inet6_dev *idev) 4282 { 4283 if (!idev || !idev->dev) 4284 return; 4285 4286 if (idev->cnf.disable_ipv6) 4287 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4288 else 4289 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4290 } 4291 4292 static void addrconf_disable_change(struct net *net, __s32 newf) 4293 { 4294 struct net_device *dev; 4295 struct inet6_dev *idev; 4296 4297 rcu_read_lock(); 4298 for_each_netdev_rcu(net, dev) { 4299 idev = __in6_dev_get(dev); 4300 if (idev) { 4301 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4302 idev->cnf.disable_ipv6 = newf; 4303 if (changed) 4304 dev_disable_change(idev); 4305 } 4306 } 4307 rcu_read_unlock(); 4308 } 4309 4310 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4311 { 4312 struct net *net; 4313 int old; 4314 4315 if (!rtnl_trylock()) 4316 return restart_syscall(); 4317 4318 net = (struct net *)table->extra2; 4319 old = *p; 4320 *p = newf; 4321 4322 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4323 rtnl_unlock(); 4324 return 0; 4325 } 4326 4327 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4328 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4329 addrconf_disable_change(net, newf); 4330 } else if ((!newf) ^ (!old)) 4331 dev_disable_change((struct inet6_dev *)table->extra1); 4332 4333 rtnl_unlock(); 4334 return 0; 4335 } 4336 4337 static 4338 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4339 void __user *buffer, size_t *lenp, loff_t *ppos) 4340 { 4341 int *valp = ctl->data; 4342 int val = *valp; 4343 loff_t pos = *ppos; 4344 ctl_table lctl; 4345 int ret; 4346 4347 /* 4348 * ctl->data points to idev->cnf.disable_ipv6, we should 4349 * not modify it until we get the rtnl lock. 4350 */ 4351 lctl = *ctl; 4352 lctl.data = &val; 4353 4354 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4355 4356 if (write) 4357 ret = addrconf_disable_ipv6(ctl, valp, val); 4358 if (ret) 4359 *ppos = pos; 4360 return ret; 4361 } 4362 4363 static struct addrconf_sysctl_table 4364 { 4365 struct ctl_table_header *sysctl_header; 4366 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4367 } addrconf_sysctl __read_mostly = { 4368 .sysctl_header = NULL, 4369 .addrconf_vars = { 4370 { 4371 .procname = "forwarding", 4372 .data = &ipv6_devconf.forwarding, 4373 .maxlen = sizeof(int), 4374 .mode = 0644, 4375 .proc_handler = addrconf_sysctl_forward, 4376 }, 4377 { 4378 .procname = "hop_limit", 4379 .data = &ipv6_devconf.hop_limit, 4380 .maxlen = sizeof(int), 4381 .mode = 0644, 4382 .proc_handler = proc_dointvec, 4383 }, 4384 { 4385 .procname = "mtu", 4386 .data = &ipv6_devconf.mtu6, 4387 .maxlen = sizeof(int), 4388 .mode = 0644, 4389 .proc_handler = proc_dointvec, 4390 }, 4391 { 4392 .procname = "accept_ra", 4393 .data = &ipv6_devconf.accept_ra, 4394 .maxlen = sizeof(int), 4395 .mode = 0644, 4396 .proc_handler = proc_dointvec, 4397 }, 4398 { 4399 .procname = "accept_redirects", 4400 .data = &ipv6_devconf.accept_redirects, 4401 .maxlen = sizeof(int), 4402 .mode = 0644, 4403 .proc_handler = proc_dointvec, 4404 }, 4405 { 4406 .procname = "autoconf", 4407 .data = &ipv6_devconf.autoconf, 4408 .maxlen = sizeof(int), 4409 .mode = 0644, 4410 .proc_handler = proc_dointvec, 4411 }, 4412 { 4413 .procname = "dad_transmits", 4414 .data = &ipv6_devconf.dad_transmits, 4415 .maxlen = sizeof(int), 4416 .mode = 0644, 4417 .proc_handler = proc_dointvec, 4418 }, 4419 { 4420 .procname = "router_solicitations", 4421 .data = &ipv6_devconf.rtr_solicits, 4422 .maxlen = sizeof(int), 4423 .mode = 0644, 4424 .proc_handler = proc_dointvec, 4425 }, 4426 { 4427 .procname = "router_solicitation_interval", 4428 .data = &ipv6_devconf.rtr_solicit_interval, 4429 .maxlen = sizeof(int), 4430 .mode = 0644, 4431 .proc_handler = proc_dointvec_jiffies, 4432 }, 4433 { 4434 .procname = "router_solicitation_delay", 4435 .data = &ipv6_devconf.rtr_solicit_delay, 4436 .maxlen = sizeof(int), 4437 .mode = 0644, 4438 .proc_handler = proc_dointvec_jiffies, 4439 }, 4440 { 4441 .procname = "force_mld_version", 4442 .data = &ipv6_devconf.force_mld_version, 4443 .maxlen = sizeof(int), 4444 .mode = 0644, 4445 .proc_handler = proc_dointvec, 4446 }, 4447 #ifdef CONFIG_IPV6_PRIVACY 4448 { 4449 .procname = "use_tempaddr", 4450 .data = &ipv6_devconf.use_tempaddr, 4451 .maxlen = sizeof(int), 4452 .mode = 0644, 4453 .proc_handler = proc_dointvec, 4454 }, 4455 { 4456 .procname = "temp_valid_lft", 4457 .data = &ipv6_devconf.temp_valid_lft, 4458 .maxlen = sizeof(int), 4459 .mode = 0644, 4460 .proc_handler = proc_dointvec, 4461 }, 4462 { 4463 .procname = "temp_prefered_lft", 4464 .data = &ipv6_devconf.temp_prefered_lft, 4465 .maxlen = sizeof(int), 4466 .mode = 0644, 4467 .proc_handler = proc_dointvec, 4468 }, 4469 { 4470 .procname = "regen_max_retry", 4471 .data = &ipv6_devconf.regen_max_retry, 4472 .maxlen = sizeof(int), 4473 .mode = 0644, 4474 .proc_handler = proc_dointvec, 4475 }, 4476 { 4477 .procname = "max_desync_factor", 4478 .data = &ipv6_devconf.max_desync_factor, 4479 .maxlen = sizeof(int), 4480 .mode = 0644, 4481 .proc_handler = proc_dointvec, 4482 }, 4483 #endif 4484 { 4485 .procname = "max_addresses", 4486 .data = &ipv6_devconf.max_addresses, 4487 .maxlen = sizeof(int), 4488 .mode = 0644, 4489 .proc_handler = proc_dointvec, 4490 }, 4491 { 4492 .procname = "accept_ra_defrtr", 4493 .data = &ipv6_devconf.accept_ra_defrtr, 4494 .maxlen = sizeof(int), 4495 .mode = 0644, 4496 .proc_handler = proc_dointvec, 4497 }, 4498 { 4499 .procname = "accept_ra_pinfo", 4500 .data = &ipv6_devconf.accept_ra_pinfo, 4501 .maxlen = sizeof(int), 4502 .mode = 0644, 4503 .proc_handler = proc_dointvec, 4504 }, 4505 #ifdef CONFIG_IPV6_ROUTER_PREF 4506 { 4507 .procname = "accept_ra_rtr_pref", 4508 .data = &ipv6_devconf.accept_ra_rtr_pref, 4509 .maxlen = sizeof(int), 4510 .mode = 0644, 4511 .proc_handler = proc_dointvec, 4512 }, 4513 { 4514 .procname = "router_probe_interval", 4515 .data = &ipv6_devconf.rtr_probe_interval, 4516 .maxlen = sizeof(int), 4517 .mode = 0644, 4518 .proc_handler = proc_dointvec_jiffies, 4519 }, 4520 #ifdef CONFIG_IPV6_ROUTE_INFO 4521 { 4522 .procname = "accept_ra_rt_info_max_plen", 4523 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4524 .maxlen = sizeof(int), 4525 .mode = 0644, 4526 .proc_handler = proc_dointvec, 4527 }, 4528 #endif 4529 #endif 4530 { 4531 .procname = "proxy_ndp", 4532 .data = &ipv6_devconf.proxy_ndp, 4533 .maxlen = sizeof(int), 4534 .mode = 0644, 4535 .proc_handler = proc_dointvec, 4536 }, 4537 { 4538 .procname = "accept_source_route", 4539 .data = &ipv6_devconf.accept_source_route, 4540 .maxlen = sizeof(int), 4541 .mode = 0644, 4542 .proc_handler = proc_dointvec, 4543 }, 4544 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4545 { 4546 .procname = "optimistic_dad", 4547 .data = &ipv6_devconf.optimistic_dad, 4548 .maxlen = sizeof(int), 4549 .mode = 0644, 4550 .proc_handler = proc_dointvec, 4551 4552 }, 4553 #endif 4554 #ifdef CONFIG_IPV6_MROUTE 4555 { 4556 .procname = "mc_forwarding", 4557 .data = &ipv6_devconf.mc_forwarding, 4558 .maxlen = sizeof(int), 4559 .mode = 0444, 4560 .proc_handler = proc_dointvec, 4561 }, 4562 #endif 4563 { 4564 .procname = "disable_ipv6", 4565 .data = &ipv6_devconf.disable_ipv6, 4566 .maxlen = sizeof(int), 4567 .mode = 0644, 4568 .proc_handler = addrconf_sysctl_disable, 4569 }, 4570 { 4571 .procname = "accept_dad", 4572 .data = &ipv6_devconf.accept_dad, 4573 .maxlen = sizeof(int), 4574 .mode = 0644, 4575 .proc_handler = proc_dointvec, 4576 }, 4577 { 4578 .procname = "force_tllao", 4579 .data = &ipv6_devconf.force_tllao, 4580 .maxlen = sizeof(int), 4581 .mode = 0644, 4582 .proc_handler = proc_dointvec 4583 }, 4584 { 4585 /* sentinel */ 4586 } 4587 }, 4588 }; 4589 4590 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4591 struct inet6_dev *idev, struct ipv6_devconf *p) 4592 { 4593 int i; 4594 struct addrconf_sysctl_table *t; 4595 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4596 4597 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4598 if (t == NULL) 4599 goto out; 4600 4601 for (i = 0; t->addrconf_vars[i].data; i++) { 4602 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4603 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4604 t->addrconf_vars[i].extra2 = net; 4605 } 4606 4607 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4608 4609 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4610 if (t->sysctl_header == NULL) 4611 goto free; 4612 4613 p->sysctl = t; 4614 return 0; 4615 4616 free: 4617 kfree(t); 4618 out: 4619 return -ENOBUFS; 4620 } 4621 4622 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4623 { 4624 struct addrconf_sysctl_table *t; 4625 4626 if (p->sysctl == NULL) 4627 return; 4628 4629 t = p->sysctl; 4630 p->sysctl = NULL; 4631 unregister_net_sysctl_table(t->sysctl_header); 4632 kfree(t); 4633 } 4634 4635 static void addrconf_sysctl_register(struct inet6_dev *idev) 4636 { 4637 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4638 &ndisc_ifinfo_sysctl_change); 4639 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4640 idev, &idev->cnf); 4641 } 4642 4643 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4644 { 4645 __addrconf_sysctl_unregister(&idev->cnf); 4646 neigh_sysctl_unregister(idev->nd_parms); 4647 } 4648 4649 4650 #endif 4651 4652 static int __net_init addrconf_init_net(struct net *net) 4653 { 4654 int err; 4655 struct ipv6_devconf *all, *dflt; 4656 4657 err = -ENOMEM; 4658 all = &ipv6_devconf; 4659 dflt = &ipv6_devconf_dflt; 4660 4661 if (!net_eq(net, &init_net)) { 4662 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4663 if (all == NULL) 4664 goto err_alloc_all; 4665 4666 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4667 if (dflt == NULL) 4668 goto err_alloc_dflt; 4669 } else { 4670 /* these will be inherited by all namespaces */ 4671 dflt->autoconf = ipv6_defaults.autoconf; 4672 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4673 } 4674 4675 net->ipv6.devconf_all = all; 4676 net->ipv6.devconf_dflt = dflt; 4677 4678 #ifdef CONFIG_SYSCTL 4679 err = __addrconf_sysctl_register(net, "all", NULL, all); 4680 if (err < 0) 4681 goto err_reg_all; 4682 4683 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4684 if (err < 0) 4685 goto err_reg_dflt; 4686 #endif 4687 return 0; 4688 4689 #ifdef CONFIG_SYSCTL 4690 err_reg_dflt: 4691 __addrconf_sysctl_unregister(all); 4692 err_reg_all: 4693 kfree(dflt); 4694 #endif 4695 err_alloc_dflt: 4696 kfree(all); 4697 err_alloc_all: 4698 return err; 4699 } 4700 4701 static void __net_exit addrconf_exit_net(struct net *net) 4702 { 4703 #ifdef CONFIG_SYSCTL 4704 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4705 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4706 #endif 4707 if (!net_eq(net, &init_net)) { 4708 kfree(net->ipv6.devconf_dflt); 4709 kfree(net->ipv6.devconf_all); 4710 } 4711 } 4712 4713 static struct pernet_operations addrconf_ops = { 4714 .init = addrconf_init_net, 4715 .exit = addrconf_exit_net, 4716 }; 4717 4718 /* 4719 * Device notifier 4720 */ 4721 4722 int register_inet6addr_notifier(struct notifier_block *nb) 4723 { 4724 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4725 } 4726 EXPORT_SYMBOL(register_inet6addr_notifier); 4727 4728 int unregister_inet6addr_notifier(struct notifier_block *nb) 4729 { 4730 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4731 } 4732 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4733 4734 static struct rtnl_af_ops inet6_ops = { 4735 .family = AF_INET6, 4736 .fill_link_af = inet6_fill_link_af, 4737 .get_link_af_size = inet6_get_link_af_size, 4738 }; 4739 4740 /* 4741 * Init / cleanup code 4742 */ 4743 4744 int __init addrconf_init(void) 4745 { 4746 int i, err; 4747 4748 err = ipv6_addr_label_init(); 4749 if (err < 0) { 4750 pr_crit("%s: cannot initialize default policy table: %d\n", 4751 __func__, err); 4752 goto out; 4753 } 4754 4755 err = register_pernet_subsys(&addrconf_ops); 4756 if (err < 0) 4757 goto out_addrlabel; 4758 4759 /* The addrconf netdev notifier requires that loopback_dev 4760 * has it's ipv6 private information allocated and setup 4761 * before it can bring up and give link-local addresses 4762 * to other devices which are up. 4763 * 4764 * Unfortunately, loopback_dev is not necessarily the first 4765 * entry in the global dev_base list of net devices. In fact, 4766 * it is likely to be the very last entry on that list. 4767 * So this causes the notifier registry below to try and 4768 * give link-local addresses to all devices besides loopback_dev 4769 * first, then loopback_dev, which cases all the non-loopback_dev 4770 * devices to fail to get a link-local address. 4771 * 4772 * So, as a temporary fix, allocate the ipv6 structure for 4773 * loopback_dev first by hand. 4774 * Longer term, all of the dependencies ipv6 has upon the loopback 4775 * device and it being up should be removed. 4776 */ 4777 rtnl_lock(); 4778 if (!ipv6_add_dev(init_net.loopback_dev)) 4779 err = -ENOMEM; 4780 rtnl_unlock(); 4781 if (err) 4782 goto errlo; 4783 4784 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4785 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4786 4787 register_netdevice_notifier(&ipv6_dev_notf); 4788 4789 addrconf_verify(0); 4790 4791 err = rtnl_af_register(&inet6_ops); 4792 if (err < 0) 4793 goto errout_af; 4794 4795 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4796 NULL); 4797 if (err < 0) 4798 goto errout; 4799 4800 /* Only the first call to __rtnl_register can fail */ 4801 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4802 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4803 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4804 inet6_dump_ifaddr, NULL); 4805 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4806 inet6_dump_ifmcaddr, NULL); 4807 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4808 inet6_dump_ifacaddr, NULL); 4809 4810 ipv6_addr_label_rtnl_register(); 4811 4812 return 0; 4813 errout: 4814 rtnl_af_unregister(&inet6_ops); 4815 errout_af: 4816 unregister_netdevice_notifier(&ipv6_dev_notf); 4817 errlo: 4818 unregister_pernet_subsys(&addrconf_ops); 4819 out_addrlabel: 4820 ipv6_addr_label_cleanup(); 4821 out: 4822 return err; 4823 } 4824 4825 void addrconf_cleanup(void) 4826 { 4827 struct net_device *dev; 4828 int i; 4829 4830 unregister_netdevice_notifier(&ipv6_dev_notf); 4831 unregister_pernet_subsys(&addrconf_ops); 4832 ipv6_addr_label_cleanup(); 4833 4834 rtnl_lock(); 4835 4836 __rtnl_af_unregister(&inet6_ops); 4837 4838 /* clean dev list */ 4839 for_each_netdev(&init_net, dev) { 4840 if (__in6_dev_get(dev) == NULL) 4841 continue; 4842 addrconf_ifdown(dev, 1); 4843 } 4844 addrconf_ifdown(init_net.loopback_dev, 2); 4845 4846 /* 4847 * Check hash table. 4848 */ 4849 spin_lock_bh(&addrconf_hash_lock); 4850 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4851 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4852 spin_unlock_bh(&addrconf_hash_lock); 4853 4854 del_timer(&addr_chk_timer); 4855 rtnl_unlock(); 4856 } 4857