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 #include <linux/hash.h> 67 68 #include <net/net_namespace.h> 69 #include <net/sock.h> 70 #include <net/snmp.h> 71 72 #include <net/af_ieee802154.h> 73 #include <net/ipv6.h> 74 #include <net/protocol.h> 75 #include <net/ndisc.h> 76 #include <net/ip6_route.h> 77 #include <net/addrconf.h> 78 #include <net/tcp.h> 79 #include <net/ip.h> 80 #include <net/netlink.h> 81 #include <net/pkt_sched.h> 82 #include <linux/if_tunnel.h> 83 #include <linux/rtnetlink.h> 84 85 #ifdef CONFIG_IPV6_PRIVACY 86 #include <linux/random.h> 87 #endif 88 89 #include <linux/uaccess.h> 90 #include <asm/unaligned.h> 91 92 #include <linux/proc_fs.h> 93 #include <linux/seq_file.h> 94 #include <linux/export.h> 95 96 /* Set to 3 to get tracing... */ 97 #define ACONF_DEBUG 2 98 99 #if ACONF_DEBUG >= 3 100 #define ADBG(x) printk x 101 #else 102 #define ADBG(x) 103 #endif 104 105 #define INFINITY_LIFE_TIME 0xFFFFFFFF 106 107 static inline u32 cstamp_delta(unsigned long cstamp) 108 { 109 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 110 } 111 112 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 113 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 114 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 115 116 #ifdef CONFIG_SYSCTL 117 static void addrconf_sysctl_register(struct inet6_dev *idev); 118 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 119 #else 120 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 121 { 122 } 123 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 125 { 126 } 127 #endif 128 129 #ifdef CONFIG_IPV6_PRIVACY 130 static void __ipv6_regen_rndid(struct inet6_dev *idev); 131 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 132 static void ipv6_regen_rndid(unsigned long data); 133 #endif 134 135 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 136 static int ipv6_count_addresses(struct inet6_dev *idev); 137 138 /* 139 * Configured unicast address hash table 140 */ 141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 142 static DEFINE_SPINLOCK(addrconf_hash_lock); 143 144 static void addrconf_verify(unsigned long); 145 146 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 147 static DEFINE_SPINLOCK(addrconf_verify_lock); 148 149 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 150 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 151 152 static void addrconf_type_change(struct net_device *dev, 153 unsigned long event); 154 static int addrconf_ifdown(struct net_device *dev, int how); 155 156 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 157 static void addrconf_dad_timer(unsigned long data); 158 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 159 static void addrconf_dad_run(struct inet6_dev *idev); 160 static void addrconf_rs_timer(unsigned long data); 161 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 162 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 163 164 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 165 struct prefix_info *pinfo); 166 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 167 struct net_device *dev); 168 169 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 170 171 static struct ipv6_devconf ipv6_devconf __read_mostly = { 172 .forwarding = 0, 173 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 174 .mtu6 = IPV6_MIN_MTU, 175 .accept_ra = 1, 176 .accept_redirects = 1, 177 .autoconf = 1, 178 .force_mld_version = 0, 179 .dad_transmits = 1, 180 .rtr_solicits = MAX_RTR_SOLICITATIONS, 181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 183 #ifdef CONFIG_IPV6_PRIVACY 184 .use_tempaddr = 0, 185 .temp_valid_lft = TEMP_VALID_LIFETIME, 186 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 187 .regen_max_retry = REGEN_MAX_RETRY, 188 .max_desync_factor = MAX_DESYNC_FACTOR, 189 #endif 190 .max_addresses = IPV6_MAX_ADDRESSES, 191 .accept_ra_defrtr = 1, 192 .accept_ra_pinfo = 1, 193 #ifdef CONFIG_IPV6_ROUTER_PREF 194 .accept_ra_rtr_pref = 1, 195 .rtr_probe_interval = 60 * HZ, 196 #ifdef CONFIG_IPV6_ROUTE_INFO 197 .accept_ra_rt_info_max_plen = 0, 198 #endif 199 #endif 200 .proxy_ndp = 0, 201 .accept_source_route = 0, /* we do not accept RH0 by default. */ 202 .disable_ipv6 = 0, 203 .accept_dad = 1, 204 }; 205 206 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 207 .forwarding = 0, 208 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 209 .mtu6 = IPV6_MIN_MTU, 210 .accept_ra = 1, 211 .accept_redirects = 1, 212 .autoconf = 1, 213 .dad_transmits = 1, 214 .rtr_solicits = MAX_RTR_SOLICITATIONS, 215 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 216 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 217 #ifdef CONFIG_IPV6_PRIVACY 218 .use_tempaddr = 0, 219 .temp_valid_lft = TEMP_VALID_LIFETIME, 220 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 221 .regen_max_retry = REGEN_MAX_RETRY, 222 .max_desync_factor = MAX_DESYNC_FACTOR, 223 #endif 224 .max_addresses = IPV6_MAX_ADDRESSES, 225 .accept_ra_defrtr = 1, 226 .accept_ra_pinfo = 1, 227 #ifdef CONFIG_IPV6_ROUTER_PREF 228 .accept_ra_rtr_pref = 1, 229 .rtr_probe_interval = 60 * HZ, 230 #ifdef CONFIG_IPV6_ROUTE_INFO 231 .accept_ra_rt_info_max_plen = 0, 232 #endif 233 #endif 234 .proxy_ndp = 0, 235 .accept_source_route = 0, /* we do not accept RH0 by default. */ 236 .disable_ipv6 = 0, 237 .accept_dad = 1, 238 }; 239 240 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 241 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 242 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 243 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 244 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 245 246 /* Check if a valid qdisc is available */ 247 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 248 { 249 return !qdisc_tx_is_noop(dev); 250 } 251 252 /* Check if a route is valid prefix route */ 253 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 254 { 255 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 256 } 257 258 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 259 { 260 if (del_timer(&ifp->timer)) 261 __in6_ifa_put(ifp); 262 } 263 264 enum addrconf_timer_t { 265 AC_NONE, 266 AC_DAD, 267 AC_RS, 268 }; 269 270 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 271 enum addrconf_timer_t what, 272 unsigned long when) 273 { 274 if (!del_timer(&ifp->timer)) 275 in6_ifa_hold(ifp); 276 277 switch (what) { 278 case AC_DAD: 279 ifp->timer.function = addrconf_dad_timer; 280 break; 281 case AC_RS: 282 ifp->timer.function = addrconf_rs_timer; 283 break; 284 default: 285 break; 286 } 287 ifp->timer.expires = jiffies + when; 288 add_timer(&ifp->timer); 289 } 290 291 static int snmp6_alloc_dev(struct inet6_dev *idev) 292 { 293 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 294 sizeof(struct ipstats_mib), 295 __alignof__(struct ipstats_mib)) < 0) 296 goto err_ip; 297 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 298 GFP_KERNEL); 299 if (!idev->stats.icmpv6dev) 300 goto err_icmp; 301 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 302 GFP_KERNEL); 303 if (!idev->stats.icmpv6msgdev) 304 goto err_icmpmsg; 305 306 return 0; 307 308 err_icmpmsg: 309 kfree(idev->stats.icmpv6dev); 310 err_icmp: 311 snmp_mib_free((void __percpu **)idev->stats.ipv6); 312 err_ip: 313 return -ENOMEM; 314 } 315 316 static void snmp6_free_dev(struct inet6_dev *idev) 317 { 318 kfree(idev->stats.icmpv6msgdev); 319 kfree(idev->stats.icmpv6dev); 320 snmp_mib_free((void __percpu **)idev->stats.ipv6); 321 } 322 323 /* Nobody refers to this device, we may destroy it. */ 324 325 void in6_dev_finish_destroy(struct inet6_dev *idev) 326 { 327 struct net_device *dev = idev->dev; 328 329 WARN_ON(!list_empty(&idev->addr_list)); 330 WARN_ON(idev->mc_list != NULL); 331 332 #ifdef NET_REFCNT_DEBUG 333 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 334 #endif 335 dev_put(dev); 336 if (!idev->dead) { 337 pr_warn("Freeing alive inet6 device %p\n", idev); 338 return; 339 } 340 snmp6_free_dev(idev); 341 kfree_rcu(idev, rcu); 342 } 343 EXPORT_SYMBOL(in6_dev_finish_destroy); 344 345 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 346 { 347 struct inet6_dev *ndev; 348 349 ASSERT_RTNL(); 350 351 if (dev->mtu < IPV6_MIN_MTU) 352 return NULL; 353 354 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 355 356 if (ndev == NULL) 357 return NULL; 358 359 rwlock_init(&ndev->lock); 360 ndev->dev = dev; 361 INIT_LIST_HEAD(&ndev->addr_list); 362 363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 364 ndev->cnf.mtu6 = dev->mtu; 365 ndev->cnf.sysctl = NULL; 366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 367 if (ndev->nd_parms == NULL) { 368 kfree(ndev); 369 return NULL; 370 } 371 if (ndev->cnf.forwarding) 372 dev_disable_lro(dev); 373 /* We refer to the device */ 374 dev_hold(dev); 375 376 if (snmp6_alloc_dev(ndev) < 0) { 377 ADBG((KERN_WARNING 378 "%s: cannot allocate memory for statistics; dev=%s.\n", 379 __func__, dev->name)); 380 neigh_parms_release(&nd_tbl, ndev->nd_parms); 381 dev_put(dev); 382 kfree(ndev); 383 return NULL; 384 } 385 386 if (snmp6_register_dev(ndev) < 0) { 387 ADBG((KERN_WARNING 388 "%s: cannot create /proc/net/dev_snmp6/%s\n", 389 __func__, dev->name)); 390 neigh_parms_release(&nd_tbl, ndev->nd_parms); 391 ndev->dead = 1; 392 in6_dev_finish_destroy(ndev); 393 return NULL; 394 } 395 396 /* One reference from device. We must do this before 397 * we invoke __ipv6_regen_rndid(). 398 */ 399 in6_dev_hold(ndev); 400 401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 402 ndev->cnf.accept_dad = -1; 403 404 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 406 pr_info("%s: Disabled Multicast RS\n", dev->name); 407 ndev->cnf.rtr_solicits = 0; 408 } 409 #endif 410 411 #ifdef CONFIG_IPV6_PRIVACY 412 INIT_LIST_HEAD(&ndev->tempaddr_list); 413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 414 if ((dev->flags&IFF_LOOPBACK) || 415 dev->type == ARPHRD_TUNNEL || 416 dev->type == ARPHRD_TUNNEL6 || 417 dev->type == ARPHRD_SIT || 418 dev->type == ARPHRD_NONE) { 419 ndev->cnf.use_tempaddr = -1; 420 } else { 421 in6_dev_hold(ndev); 422 ipv6_regen_rndid((unsigned long) ndev); 423 } 424 #endif 425 426 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 427 ndev->if_flags |= IF_READY; 428 429 ipv6_mc_init_dev(ndev); 430 ndev->tstamp = jiffies; 431 addrconf_sysctl_register(ndev); 432 /* protected by rtnl_lock */ 433 rcu_assign_pointer(dev->ip6_ptr, ndev); 434 435 /* Join all-node multicast group */ 436 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 437 438 /* Join all-router multicast group if forwarding is set */ 439 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 441 442 return ndev; 443 } 444 445 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 446 { 447 struct inet6_dev *idev; 448 449 ASSERT_RTNL(); 450 451 idev = __in6_dev_get(dev); 452 if (!idev) { 453 idev = ipv6_add_dev(dev); 454 if (!idev) 455 return NULL; 456 } 457 458 if (dev->flags&IFF_UP) 459 ipv6_mc_up(idev); 460 return idev; 461 } 462 463 #ifdef CONFIG_SYSCTL 464 static void dev_forward_change(struct inet6_dev *idev) 465 { 466 struct net_device *dev; 467 struct inet6_ifaddr *ifa; 468 469 if (!idev) 470 return; 471 dev = idev->dev; 472 if (idev->cnf.forwarding) 473 dev_disable_lro(dev); 474 if (dev && (dev->flags & IFF_MULTICAST)) { 475 if (idev->cnf.forwarding) 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 477 else 478 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 479 } 480 481 list_for_each_entry(ifa, &idev->addr_list, if_list) { 482 if (ifa->flags&IFA_F_TENTATIVE) 483 continue; 484 if (idev->cnf.forwarding) 485 addrconf_join_anycast(ifa); 486 else 487 addrconf_leave_anycast(ifa); 488 } 489 } 490 491 492 static void addrconf_forward_change(struct net *net, __s32 newf) 493 { 494 struct net_device *dev; 495 struct inet6_dev *idev; 496 497 for_each_netdev(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 } 507 508 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 509 { 510 struct net *net; 511 int old; 512 513 if (!rtnl_trylock()) 514 return restart_syscall(); 515 516 net = (struct net *)table->extra2; 517 old = *p; 518 *p = newf; 519 520 if (p == &net->ipv6.devconf_dflt->forwarding) { 521 rtnl_unlock(); 522 return 0; 523 } 524 525 if (p == &net->ipv6.devconf_all->forwarding) { 526 net->ipv6.devconf_dflt->forwarding = newf; 527 addrconf_forward_change(net, newf); 528 } else if ((!newf) ^ (!old)) 529 dev_forward_change((struct inet6_dev *)table->extra1); 530 rtnl_unlock(); 531 532 if (newf) 533 rt6_purge_dflt_routers(net); 534 return 1; 535 } 536 #endif 537 538 /* Nobody refers to this ifaddr, destroy it */ 539 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 540 { 541 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 542 543 #ifdef NET_REFCNT_DEBUG 544 pr_debug("%s\n", __func__); 545 #endif 546 547 in6_dev_put(ifp->idev); 548 549 if (del_timer(&ifp->timer)) 550 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 551 552 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 553 pr_warn("Freeing alive inet6 address %p\n", ifp); 554 return; 555 } 556 dst_release(&ifp->rt->dst); 557 558 kfree_rcu(ifp, rcu); 559 } 560 561 static void 562 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 563 { 564 struct list_head *p; 565 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 566 567 /* 568 * Each device address list is sorted in order of scope - 569 * global before linklocal. 570 */ 571 list_for_each(p, &idev->addr_list) { 572 struct inet6_ifaddr *ifa 573 = list_entry(p, struct inet6_ifaddr, if_list); 574 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 575 break; 576 } 577 578 list_add_tail(&ifp->if_list, p); 579 } 580 581 static u32 inet6_addr_hash(const struct in6_addr *addr) 582 { 583 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 584 } 585 586 /* On success it returns ifp with increased reference count */ 587 588 static struct inet6_ifaddr * 589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 590 int scope, u32 flags) 591 { 592 struct inet6_ifaddr *ifa = NULL; 593 struct rt6_info *rt; 594 unsigned int hash; 595 int err = 0; 596 int addr_type = ipv6_addr_type(addr); 597 598 if (addr_type == IPV6_ADDR_ANY || 599 addr_type & IPV6_ADDR_MULTICAST || 600 (!(idev->dev->flags & IFF_LOOPBACK) && 601 addr_type & IPV6_ADDR_LOOPBACK)) 602 return ERR_PTR(-EADDRNOTAVAIL); 603 604 rcu_read_lock_bh(); 605 if (idev->dead) { 606 err = -ENODEV; /*XXX*/ 607 goto out2; 608 } 609 610 if (idev->cnf.disable_ipv6) { 611 err = -EACCES; 612 goto out2; 613 } 614 615 spin_lock(&addrconf_hash_lock); 616 617 /* Ignore adding duplicate addresses on an interface */ 618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 619 ADBG(("ipv6_add_addr: already assigned\n")); 620 err = -EEXIST; 621 goto out; 622 } 623 624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 625 626 if (ifa == NULL) { 627 ADBG(("ipv6_add_addr: malloc failed\n")); 628 err = -ENOBUFS; 629 goto out; 630 } 631 632 rt = addrconf_dst_alloc(idev, addr, false); 633 if (IS_ERR(rt)) { 634 err = PTR_ERR(rt); 635 goto out; 636 } 637 638 ifa->addr = *addr; 639 640 spin_lock_init(&ifa->lock); 641 spin_lock_init(&ifa->state_lock); 642 init_timer(&ifa->timer); 643 INIT_HLIST_NODE(&ifa->addr_lst); 644 ifa->timer.data = (unsigned long) ifa; 645 ifa->scope = scope; 646 ifa->prefix_len = pfxlen; 647 ifa->flags = flags | IFA_F_TENTATIVE; 648 ifa->cstamp = ifa->tstamp = jiffies; 649 650 ifa->rt = rt; 651 652 ifa->idev = idev; 653 in6_dev_hold(idev); 654 /* For caller */ 655 in6_ifa_hold(ifa); 656 657 /* Add to big hash table */ 658 hash = inet6_addr_hash(addr); 659 660 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 661 spin_unlock(&addrconf_hash_lock); 662 663 write_lock(&idev->lock); 664 /* Add to inet6_dev unicast addr list. */ 665 ipv6_link_dev_addr(idev, ifa); 666 667 #ifdef CONFIG_IPV6_PRIVACY 668 if (ifa->flags&IFA_F_TEMPORARY) { 669 list_add(&ifa->tmp_list, &idev->tempaddr_list); 670 in6_ifa_hold(ifa); 671 } 672 #endif 673 674 in6_ifa_hold(ifa); 675 write_unlock(&idev->lock); 676 out2: 677 rcu_read_unlock_bh(); 678 679 if (likely(err == 0)) 680 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 681 else { 682 kfree(ifa); 683 ifa = ERR_PTR(err); 684 } 685 686 return ifa; 687 out: 688 spin_unlock(&addrconf_hash_lock); 689 goto out2; 690 } 691 692 /* This function wants to get referenced ifp and releases it before return */ 693 694 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 695 { 696 struct inet6_ifaddr *ifa, *ifn; 697 struct inet6_dev *idev = ifp->idev; 698 int state; 699 int deleted = 0, onlink = 0; 700 unsigned long expires = jiffies; 701 702 spin_lock_bh(&ifp->state_lock); 703 state = ifp->state; 704 ifp->state = INET6_IFADDR_STATE_DEAD; 705 spin_unlock_bh(&ifp->state_lock); 706 707 if (state == INET6_IFADDR_STATE_DEAD) 708 goto out; 709 710 spin_lock_bh(&addrconf_hash_lock); 711 hlist_del_init_rcu(&ifp->addr_lst); 712 spin_unlock_bh(&addrconf_hash_lock); 713 714 write_lock_bh(&idev->lock); 715 #ifdef CONFIG_IPV6_PRIVACY 716 if (ifp->flags&IFA_F_TEMPORARY) { 717 list_del(&ifp->tmp_list); 718 if (ifp->ifpub) { 719 in6_ifa_put(ifp->ifpub); 720 ifp->ifpub = NULL; 721 } 722 __in6_ifa_put(ifp); 723 } 724 #endif 725 726 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 727 if (ifa == ifp) { 728 list_del_init(&ifp->if_list); 729 __in6_ifa_put(ifp); 730 731 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 732 break; 733 deleted = 1; 734 continue; 735 } else if (ifp->flags & IFA_F_PERMANENT) { 736 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 737 ifp->prefix_len)) { 738 if (ifa->flags & IFA_F_PERMANENT) { 739 onlink = 1; 740 if (deleted) 741 break; 742 } else { 743 unsigned long lifetime; 744 745 if (!onlink) 746 onlink = -1; 747 748 spin_lock(&ifa->lock); 749 750 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 751 /* 752 * Note: Because this address is 753 * not permanent, lifetime < 754 * LONG_MAX / HZ here. 755 */ 756 if (time_before(expires, 757 ifa->tstamp + lifetime * HZ)) 758 expires = ifa->tstamp + lifetime * HZ; 759 spin_unlock(&ifa->lock); 760 } 761 } 762 } 763 } 764 write_unlock_bh(&idev->lock); 765 766 addrconf_del_timer(ifp); 767 768 ipv6_ifa_notify(RTM_DELADDR, ifp); 769 770 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 771 772 /* 773 * Purge or update corresponding prefix 774 * 775 * 1) we don't purge prefix here if address was not permanent. 776 * prefix is managed by its own lifetime. 777 * 2) if there're no addresses, delete prefix. 778 * 3) if there're still other permanent address(es), 779 * corresponding prefix is still permanent. 780 * 4) otherwise, update prefix lifetime to the 781 * longest valid lifetime among the corresponding 782 * addresses on the device. 783 * Note: subsequent RA will update lifetime. 784 * 785 * --yoshfuji 786 */ 787 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 788 struct in6_addr prefix; 789 struct rt6_info *rt; 790 struct net *net = dev_net(ifp->idev->dev); 791 struct flowi6 fl6 = {}; 792 793 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 794 fl6.flowi6_oif = ifp->idev->dev->ifindex; 795 fl6.daddr = prefix; 796 rt = (struct rt6_info *)ip6_route_lookup(net, &fl6, 797 RT6_LOOKUP_F_IFACE); 798 799 if (rt != net->ipv6.ip6_null_entry && 800 addrconf_is_prefix_route(rt)) { 801 if (onlink == 0) { 802 ip6_del_rt(rt); 803 rt = NULL; 804 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 805 rt6_set_expires(rt, expires); 806 } 807 } 808 dst_release(&rt->dst); 809 } 810 811 /* clean up prefsrc entries */ 812 rt6_remove_prefsrc(ifp); 813 out: 814 in6_ifa_put(ifp); 815 } 816 817 #ifdef CONFIG_IPV6_PRIVACY 818 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 819 { 820 struct inet6_dev *idev = ifp->idev; 821 struct in6_addr addr, *tmpaddr; 822 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 823 unsigned long regen_advance; 824 int tmp_plen; 825 int ret = 0; 826 int max_addresses; 827 u32 addr_flags; 828 unsigned long now = jiffies; 829 830 write_lock(&idev->lock); 831 if (ift) { 832 spin_lock_bh(&ift->lock); 833 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 834 spin_unlock_bh(&ift->lock); 835 tmpaddr = &addr; 836 } else { 837 tmpaddr = NULL; 838 } 839 retry: 840 in6_dev_hold(idev); 841 if (idev->cnf.use_tempaddr <= 0) { 842 write_unlock(&idev->lock); 843 pr_info("%s: use_tempaddr is disabled\n", __func__); 844 in6_dev_put(idev); 845 ret = -1; 846 goto out; 847 } 848 spin_lock_bh(&ifp->lock); 849 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 850 idev->cnf.use_tempaddr = -1; /*XXX*/ 851 spin_unlock_bh(&ifp->lock); 852 write_unlock(&idev->lock); 853 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 854 __func__); 855 in6_dev_put(idev); 856 ret = -1; 857 goto out; 858 } 859 in6_ifa_hold(ifp); 860 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 861 __ipv6_try_regen_rndid(idev, tmpaddr); 862 memcpy(&addr.s6_addr[8], idev->rndid, 8); 863 age = (now - ifp->tstamp) / HZ; 864 tmp_valid_lft = min_t(__u32, 865 ifp->valid_lft, 866 idev->cnf.temp_valid_lft + age); 867 tmp_prefered_lft = min_t(__u32, 868 ifp->prefered_lft, 869 idev->cnf.temp_prefered_lft + age - 870 idev->cnf.max_desync_factor); 871 tmp_plen = ifp->prefix_len; 872 max_addresses = idev->cnf.max_addresses; 873 tmp_tstamp = ifp->tstamp; 874 spin_unlock_bh(&ifp->lock); 875 876 regen_advance = idev->cnf.regen_max_retry * 877 idev->cnf.dad_transmits * 878 idev->nd_parms->retrans_time / HZ; 879 write_unlock(&idev->lock); 880 881 /* A temporary address is created only if this calculated Preferred 882 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 883 * an implementation must not create a temporary address with a zero 884 * Preferred Lifetime. 885 */ 886 if (tmp_prefered_lft <= regen_advance) { 887 in6_ifa_put(ifp); 888 in6_dev_put(idev); 889 ret = -1; 890 goto out; 891 } 892 893 addr_flags = IFA_F_TEMPORARY; 894 /* set in addrconf_prefix_rcv() */ 895 if (ifp->flags & IFA_F_OPTIMISTIC) 896 addr_flags |= IFA_F_OPTIMISTIC; 897 898 ift = !max_addresses || 899 ipv6_count_addresses(idev) < max_addresses ? 900 ipv6_add_addr(idev, &addr, tmp_plen, 901 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 902 addr_flags) : NULL; 903 if (!ift || IS_ERR(ift)) { 904 in6_ifa_put(ifp); 905 in6_dev_put(idev); 906 pr_info("%s: retry temporary address regeneration\n", __func__); 907 tmpaddr = &addr; 908 write_lock(&idev->lock); 909 goto retry; 910 } 911 912 spin_lock_bh(&ift->lock); 913 ift->ifpub = ifp; 914 ift->valid_lft = tmp_valid_lft; 915 ift->prefered_lft = tmp_prefered_lft; 916 ift->cstamp = now; 917 ift->tstamp = tmp_tstamp; 918 spin_unlock_bh(&ift->lock); 919 920 addrconf_dad_start(ift); 921 in6_ifa_put(ift); 922 in6_dev_put(idev); 923 out: 924 return ret; 925 } 926 #endif 927 928 /* 929 * Choose an appropriate source address (RFC3484) 930 */ 931 enum { 932 IPV6_SADDR_RULE_INIT = 0, 933 IPV6_SADDR_RULE_LOCAL, 934 IPV6_SADDR_RULE_SCOPE, 935 IPV6_SADDR_RULE_PREFERRED, 936 #ifdef CONFIG_IPV6_MIP6 937 IPV6_SADDR_RULE_HOA, 938 #endif 939 IPV6_SADDR_RULE_OIF, 940 IPV6_SADDR_RULE_LABEL, 941 #ifdef CONFIG_IPV6_PRIVACY 942 IPV6_SADDR_RULE_PRIVACY, 943 #endif 944 IPV6_SADDR_RULE_ORCHID, 945 IPV6_SADDR_RULE_PREFIX, 946 IPV6_SADDR_RULE_MAX 947 }; 948 949 struct ipv6_saddr_score { 950 int rule; 951 int addr_type; 952 struct inet6_ifaddr *ifa; 953 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 954 int scopedist; 955 int matchlen; 956 }; 957 958 struct ipv6_saddr_dst { 959 const struct in6_addr *addr; 960 int ifindex; 961 int scope; 962 int label; 963 unsigned int prefs; 964 }; 965 966 static inline int ipv6_saddr_preferred(int type) 967 { 968 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 969 return 1; 970 return 0; 971 } 972 973 static int ipv6_get_saddr_eval(struct net *net, 974 struct ipv6_saddr_score *score, 975 struct ipv6_saddr_dst *dst, 976 int i) 977 { 978 int ret; 979 980 if (i <= score->rule) { 981 switch (i) { 982 case IPV6_SADDR_RULE_SCOPE: 983 ret = score->scopedist; 984 break; 985 case IPV6_SADDR_RULE_PREFIX: 986 ret = score->matchlen; 987 break; 988 default: 989 ret = !!test_bit(i, score->scorebits); 990 } 991 goto out; 992 } 993 994 switch (i) { 995 case IPV6_SADDR_RULE_INIT: 996 /* Rule 0: remember if hiscore is not ready yet */ 997 ret = !!score->ifa; 998 break; 999 case IPV6_SADDR_RULE_LOCAL: 1000 /* Rule 1: Prefer same address */ 1001 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1002 break; 1003 case IPV6_SADDR_RULE_SCOPE: 1004 /* Rule 2: Prefer appropriate scope 1005 * 1006 * ret 1007 * ^ 1008 * -1 | d 15 1009 * ---+--+-+---> scope 1010 * | 1011 * | d is scope of the destination. 1012 * B-d | \ 1013 * | \ <- smaller scope is better if 1014 * B-15 | \ if scope is enough for destinaion. 1015 * | ret = B - scope (-1 <= scope >= d <= 15). 1016 * d-C-1 | / 1017 * |/ <- greater is better 1018 * -C / if scope is not enough for destination. 1019 * /| ret = scope - C (-1 <= d < scope <= 15). 1020 * 1021 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1022 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1023 * Assume B = 0 and we get C > 29. 1024 */ 1025 ret = __ipv6_addr_src_scope(score->addr_type); 1026 if (ret >= dst->scope) 1027 ret = -ret; 1028 else 1029 ret -= 128; /* 30 is enough */ 1030 score->scopedist = ret; 1031 break; 1032 case IPV6_SADDR_RULE_PREFERRED: 1033 /* Rule 3: Avoid deprecated and optimistic addresses */ 1034 ret = ipv6_saddr_preferred(score->addr_type) || 1035 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1036 break; 1037 #ifdef CONFIG_IPV6_MIP6 1038 case IPV6_SADDR_RULE_HOA: 1039 { 1040 /* Rule 4: Prefer home address */ 1041 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1042 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1043 break; 1044 } 1045 #endif 1046 case IPV6_SADDR_RULE_OIF: 1047 /* Rule 5: Prefer outgoing interface */ 1048 ret = (!dst->ifindex || 1049 dst->ifindex == score->ifa->idev->dev->ifindex); 1050 break; 1051 case IPV6_SADDR_RULE_LABEL: 1052 /* Rule 6: Prefer matching label */ 1053 ret = ipv6_addr_label(net, 1054 &score->ifa->addr, score->addr_type, 1055 score->ifa->idev->dev->ifindex) == dst->label; 1056 break; 1057 #ifdef CONFIG_IPV6_PRIVACY 1058 case IPV6_SADDR_RULE_PRIVACY: 1059 { 1060 /* Rule 7: Prefer public address 1061 * Note: prefer temporary address if use_tempaddr >= 2 1062 */ 1063 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1064 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1065 score->ifa->idev->cnf.use_tempaddr >= 2; 1066 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1067 break; 1068 } 1069 #endif 1070 case IPV6_SADDR_RULE_ORCHID: 1071 /* Rule 8-: Prefer ORCHID vs ORCHID or 1072 * non-ORCHID vs non-ORCHID 1073 */ 1074 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1075 ipv6_addr_orchid(dst->addr)); 1076 break; 1077 case IPV6_SADDR_RULE_PREFIX: 1078 /* Rule 8: Use longest matching prefix */ 1079 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1080 if (ret > score->ifa->prefix_len) 1081 ret = score->ifa->prefix_len; 1082 score->matchlen = ret; 1083 break; 1084 default: 1085 ret = 0; 1086 } 1087 1088 if (ret) 1089 __set_bit(i, score->scorebits); 1090 score->rule = i; 1091 out: 1092 return ret; 1093 } 1094 1095 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1096 const struct in6_addr *daddr, unsigned int prefs, 1097 struct in6_addr *saddr) 1098 { 1099 struct ipv6_saddr_score scores[2], 1100 *score = &scores[0], *hiscore = &scores[1]; 1101 struct ipv6_saddr_dst dst; 1102 struct net_device *dev; 1103 int dst_type; 1104 1105 dst_type = __ipv6_addr_type(daddr); 1106 dst.addr = daddr; 1107 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1108 dst.scope = __ipv6_addr_src_scope(dst_type); 1109 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1110 dst.prefs = prefs; 1111 1112 hiscore->rule = -1; 1113 hiscore->ifa = NULL; 1114 1115 rcu_read_lock(); 1116 1117 for_each_netdev_rcu(net, dev) { 1118 struct inet6_dev *idev; 1119 1120 /* Candidate Source Address (section 4) 1121 * - multicast and link-local destination address, 1122 * the set of candidate source address MUST only 1123 * include addresses assigned to interfaces 1124 * belonging to the same link as the outgoing 1125 * interface. 1126 * (- For site-local destination addresses, the 1127 * set of candidate source addresses MUST only 1128 * include addresses assigned to interfaces 1129 * belonging to the same site as the outgoing 1130 * interface.) 1131 */ 1132 if (((dst_type & IPV6_ADDR_MULTICAST) || 1133 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1134 dst.ifindex && dev->ifindex != dst.ifindex) 1135 continue; 1136 1137 idev = __in6_dev_get(dev); 1138 if (!idev) 1139 continue; 1140 1141 read_lock_bh(&idev->lock); 1142 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1143 int i; 1144 1145 /* 1146 * - Tentative Address (RFC2462 section 5.4) 1147 * - A tentative address is not considered 1148 * "assigned to an interface" in the traditional 1149 * sense, unless it is also flagged as optimistic. 1150 * - Candidate Source Address (section 4) 1151 * - In any case, anycast addresses, multicast 1152 * addresses, and the unspecified address MUST 1153 * NOT be included in a candidate set. 1154 */ 1155 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1156 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1157 continue; 1158 1159 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1160 1161 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1162 score->addr_type & IPV6_ADDR_MULTICAST)) { 1163 LIMIT_NETDEBUG(KERN_DEBUG 1164 "ADDRCONF: unspecified / multicast address " 1165 "assigned as unicast address on %s", 1166 dev->name); 1167 continue; 1168 } 1169 1170 score->rule = -1; 1171 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1172 1173 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1174 int minihiscore, miniscore; 1175 1176 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1177 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1178 1179 if (minihiscore > miniscore) { 1180 if (i == IPV6_SADDR_RULE_SCOPE && 1181 score->scopedist > 0) { 1182 /* 1183 * special case: 1184 * each remaining entry 1185 * has too small (not enough) 1186 * scope, because ifa entries 1187 * are sorted by their scope 1188 * values. 1189 */ 1190 goto try_nextdev; 1191 } 1192 break; 1193 } else if (minihiscore < miniscore) { 1194 if (hiscore->ifa) 1195 in6_ifa_put(hiscore->ifa); 1196 1197 in6_ifa_hold(score->ifa); 1198 1199 swap(hiscore, score); 1200 1201 /* restore our iterator */ 1202 score->ifa = hiscore->ifa; 1203 1204 break; 1205 } 1206 } 1207 } 1208 try_nextdev: 1209 read_unlock_bh(&idev->lock); 1210 } 1211 rcu_read_unlock(); 1212 1213 if (!hiscore->ifa) 1214 return -EADDRNOTAVAIL; 1215 1216 *saddr = hiscore->ifa->addr; 1217 in6_ifa_put(hiscore->ifa); 1218 return 0; 1219 } 1220 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1221 1222 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1223 unsigned char banned_flags) 1224 { 1225 struct inet6_dev *idev; 1226 int err = -EADDRNOTAVAIL; 1227 1228 rcu_read_lock(); 1229 idev = __in6_dev_get(dev); 1230 if (idev) { 1231 struct inet6_ifaddr *ifp; 1232 1233 read_lock_bh(&idev->lock); 1234 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1235 if (ifp->scope == IFA_LINK && 1236 !(ifp->flags & banned_flags)) { 1237 *addr = ifp->addr; 1238 err = 0; 1239 break; 1240 } 1241 } 1242 read_unlock_bh(&idev->lock); 1243 } 1244 rcu_read_unlock(); 1245 return err; 1246 } 1247 1248 static int ipv6_count_addresses(struct inet6_dev *idev) 1249 { 1250 int cnt = 0; 1251 struct inet6_ifaddr *ifp; 1252 1253 read_lock_bh(&idev->lock); 1254 list_for_each_entry(ifp, &idev->addr_list, if_list) 1255 cnt++; 1256 read_unlock_bh(&idev->lock); 1257 return cnt; 1258 } 1259 1260 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1261 struct net_device *dev, int strict) 1262 { 1263 struct inet6_ifaddr *ifp; 1264 struct hlist_node *node; 1265 unsigned int hash = inet6_addr_hash(addr); 1266 1267 rcu_read_lock_bh(); 1268 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1269 if (!net_eq(dev_net(ifp->idev->dev), net)) 1270 continue; 1271 if (ipv6_addr_equal(&ifp->addr, addr) && 1272 !(ifp->flags&IFA_F_TENTATIVE) && 1273 (dev == NULL || ifp->idev->dev == dev || 1274 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1275 rcu_read_unlock_bh(); 1276 return 1; 1277 } 1278 } 1279 1280 rcu_read_unlock_bh(); 1281 return 0; 1282 } 1283 EXPORT_SYMBOL(ipv6_chk_addr); 1284 1285 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1286 struct net_device *dev) 1287 { 1288 unsigned int hash = inet6_addr_hash(addr); 1289 struct inet6_ifaddr *ifp; 1290 struct hlist_node *node; 1291 1292 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1293 if (!net_eq(dev_net(ifp->idev->dev), net)) 1294 continue; 1295 if (ipv6_addr_equal(&ifp->addr, addr)) { 1296 if (dev == NULL || ifp->idev->dev == dev) 1297 return true; 1298 } 1299 } 1300 return false; 1301 } 1302 1303 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1304 { 1305 struct inet6_dev *idev; 1306 struct inet6_ifaddr *ifa; 1307 int onlink; 1308 1309 onlink = 0; 1310 rcu_read_lock(); 1311 idev = __in6_dev_get(dev); 1312 if (idev) { 1313 read_lock_bh(&idev->lock); 1314 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1315 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1316 ifa->prefix_len); 1317 if (onlink) 1318 break; 1319 } 1320 read_unlock_bh(&idev->lock); 1321 } 1322 rcu_read_unlock(); 1323 return onlink; 1324 } 1325 EXPORT_SYMBOL(ipv6_chk_prefix); 1326 1327 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1328 struct net_device *dev, int strict) 1329 { 1330 struct inet6_ifaddr *ifp, *result = NULL; 1331 unsigned int hash = inet6_addr_hash(addr); 1332 struct hlist_node *node; 1333 1334 rcu_read_lock_bh(); 1335 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1336 if (!net_eq(dev_net(ifp->idev->dev), net)) 1337 continue; 1338 if (ipv6_addr_equal(&ifp->addr, addr)) { 1339 if (dev == NULL || ifp->idev->dev == dev || 1340 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1341 result = ifp; 1342 in6_ifa_hold(ifp); 1343 break; 1344 } 1345 } 1346 } 1347 rcu_read_unlock_bh(); 1348 1349 return result; 1350 } 1351 1352 /* Gets referenced address, destroys ifaddr */ 1353 1354 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1355 { 1356 if (ifp->flags&IFA_F_PERMANENT) { 1357 spin_lock_bh(&ifp->lock); 1358 addrconf_del_timer(ifp); 1359 ifp->flags |= IFA_F_TENTATIVE; 1360 if (dad_failed) 1361 ifp->flags |= IFA_F_DADFAILED; 1362 spin_unlock_bh(&ifp->lock); 1363 if (dad_failed) 1364 ipv6_ifa_notify(0, ifp); 1365 in6_ifa_put(ifp); 1366 #ifdef CONFIG_IPV6_PRIVACY 1367 } else if (ifp->flags&IFA_F_TEMPORARY) { 1368 struct inet6_ifaddr *ifpub; 1369 spin_lock_bh(&ifp->lock); 1370 ifpub = ifp->ifpub; 1371 if (ifpub) { 1372 in6_ifa_hold(ifpub); 1373 spin_unlock_bh(&ifp->lock); 1374 ipv6_create_tempaddr(ifpub, ifp); 1375 in6_ifa_put(ifpub); 1376 } else { 1377 spin_unlock_bh(&ifp->lock); 1378 } 1379 ipv6_del_addr(ifp); 1380 #endif 1381 } else 1382 ipv6_del_addr(ifp); 1383 } 1384 1385 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1386 { 1387 int err = -ENOENT; 1388 1389 spin_lock(&ifp->state_lock); 1390 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1391 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1392 err = 0; 1393 } 1394 spin_unlock(&ifp->state_lock); 1395 1396 return err; 1397 } 1398 1399 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1400 { 1401 struct inet6_dev *idev = ifp->idev; 1402 1403 if (addrconf_dad_end(ifp)) { 1404 in6_ifa_put(ifp); 1405 return; 1406 } 1407 1408 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1409 ifp->idev->dev->name, &ifp->addr); 1410 1411 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1412 struct in6_addr addr; 1413 1414 addr.s6_addr32[0] = htonl(0xfe800000); 1415 addr.s6_addr32[1] = 0; 1416 1417 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1418 ipv6_addr_equal(&ifp->addr, &addr)) { 1419 /* DAD failed for link-local based on MAC address */ 1420 idev->cnf.disable_ipv6 = 1; 1421 1422 pr_info("%s: IPv6 being disabled!\n", 1423 ifp->idev->dev->name); 1424 } 1425 } 1426 1427 addrconf_dad_stop(ifp, 1); 1428 } 1429 1430 /* Join to solicited addr multicast group. */ 1431 1432 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1433 { 1434 struct in6_addr maddr; 1435 1436 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1437 return; 1438 1439 addrconf_addr_solict_mult(addr, &maddr); 1440 ipv6_dev_mc_inc(dev, &maddr); 1441 } 1442 1443 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1444 { 1445 struct in6_addr maddr; 1446 1447 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1448 return; 1449 1450 addrconf_addr_solict_mult(addr, &maddr); 1451 __ipv6_dev_mc_dec(idev, &maddr); 1452 } 1453 1454 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1455 { 1456 struct in6_addr addr; 1457 if (ifp->prefix_len == 127) /* RFC 6164 */ 1458 return; 1459 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1460 if (ipv6_addr_any(&addr)) 1461 return; 1462 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1463 } 1464 1465 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1466 { 1467 struct in6_addr addr; 1468 if (ifp->prefix_len == 127) /* RFC 6164 */ 1469 return; 1470 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1471 if (ipv6_addr_any(&addr)) 1472 return; 1473 __ipv6_dev_ac_dec(ifp->idev, &addr); 1474 } 1475 1476 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1477 { 1478 if (dev->addr_len != ETH_ALEN) 1479 return -1; 1480 memcpy(eui, dev->dev_addr, 3); 1481 memcpy(eui + 5, dev->dev_addr + 3, 3); 1482 1483 /* 1484 * The zSeries OSA network cards can be shared among various 1485 * OS instances, but the OSA cards have only one MAC address. 1486 * This leads to duplicate address conflicts in conjunction 1487 * with IPv6 if more than one instance uses the same card. 1488 * 1489 * The driver for these cards can deliver a unique 16-bit 1490 * identifier for each instance sharing the same card. It is 1491 * placed instead of 0xFFFE in the interface identifier. The 1492 * "u" bit of the interface identifier is not inverted in this 1493 * case. Hence the resulting interface identifier has local 1494 * scope according to RFC2373. 1495 */ 1496 if (dev->dev_id) { 1497 eui[3] = (dev->dev_id >> 8) & 0xFF; 1498 eui[4] = dev->dev_id & 0xFF; 1499 } else { 1500 eui[3] = 0xFF; 1501 eui[4] = 0xFE; 1502 eui[0] ^= 2; 1503 } 1504 return 0; 1505 } 1506 1507 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1508 { 1509 if (dev->addr_len != IEEE802154_ADDR_LEN) 1510 return -1; 1511 memcpy(eui, dev->dev_addr, 8); 1512 return 0; 1513 } 1514 1515 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1516 { 1517 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1518 if (dev->addr_len != ARCNET_ALEN) 1519 return -1; 1520 memset(eui, 0, 7); 1521 eui[7] = *(u8 *)dev->dev_addr; 1522 return 0; 1523 } 1524 1525 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1526 { 1527 if (dev->addr_len != INFINIBAND_ALEN) 1528 return -1; 1529 memcpy(eui, dev->dev_addr + 12, 8); 1530 eui[0] |= 2; 1531 return 0; 1532 } 1533 1534 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1535 { 1536 if (addr == 0) 1537 return -1; 1538 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1539 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1540 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1541 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1542 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1543 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1544 eui[1] = 0; 1545 eui[2] = 0x5E; 1546 eui[3] = 0xFE; 1547 memcpy(eui + 4, &addr, 4); 1548 return 0; 1549 } 1550 1551 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1552 { 1553 if (dev->priv_flags & IFF_ISATAP) 1554 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1555 return -1; 1556 } 1557 1558 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1559 { 1560 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1561 } 1562 1563 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1564 { 1565 switch (dev->type) { 1566 case ARPHRD_ETHER: 1567 case ARPHRD_FDDI: 1568 return addrconf_ifid_eui48(eui, dev); 1569 case ARPHRD_ARCNET: 1570 return addrconf_ifid_arcnet(eui, dev); 1571 case ARPHRD_INFINIBAND: 1572 return addrconf_ifid_infiniband(eui, dev); 1573 case ARPHRD_SIT: 1574 return addrconf_ifid_sit(eui, dev); 1575 case ARPHRD_IPGRE: 1576 return addrconf_ifid_gre(eui, dev); 1577 case ARPHRD_IEEE802154: 1578 return addrconf_ifid_eui64(eui, dev); 1579 } 1580 return -1; 1581 } 1582 1583 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1584 { 1585 int err = -1; 1586 struct inet6_ifaddr *ifp; 1587 1588 read_lock_bh(&idev->lock); 1589 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1590 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1591 memcpy(eui, ifp->addr.s6_addr+8, 8); 1592 err = 0; 1593 break; 1594 } 1595 } 1596 read_unlock_bh(&idev->lock); 1597 return err; 1598 } 1599 1600 #ifdef CONFIG_IPV6_PRIVACY 1601 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1602 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1603 { 1604 regen: 1605 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1606 idev->rndid[0] &= ~0x02; 1607 1608 /* 1609 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1610 * check if generated address is not inappropriate 1611 * 1612 * - Reserved subnet anycast (RFC 2526) 1613 * 11111101 11....11 1xxxxxxx 1614 * - ISATAP (RFC4214) 6.1 1615 * 00-00-5E-FE-xx-xx-xx-xx 1616 * - value 0 1617 * - XXX: already assigned to an address on the device 1618 */ 1619 if (idev->rndid[0] == 0xfd && 1620 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1621 (idev->rndid[7]&0x80)) 1622 goto regen; 1623 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1624 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1625 goto regen; 1626 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1627 goto regen; 1628 } 1629 } 1630 1631 static void ipv6_regen_rndid(unsigned long data) 1632 { 1633 struct inet6_dev *idev = (struct inet6_dev *) data; 1634 unsigned long expires; 1635 1636 rcu_read_lock_bh(); 1637 write_lock_bh(&idev->lock); 1638 1639 if (idev->dead) 1640 goto out; 1641 1642 __ipv6_regen_rndid(idev); 1643 1644 expires = jiffies + 1645 idev->cnf.temp_prefered_lft * HZ - 1646 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1647 idev->cnf.max_desync_factor * HZ; 1648 if (time_before(expires, jiffies)) { 1649 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1650 __func__, idev->dev->name); 1651 goto out; 1652 } 1653 1654 if (!mod_timer(&idev->regen_timer, expires)) 1655 in6_dev_hold(idev); 1656 1657 out: 1658 write_unlock_bh(&idev->lock); 1659 rcu_read_unlock_bh(); 1660 in6_dev_put(idev); 1661 } 1662 1663 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1664 { 1665 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1666 __ipv6_regen_rndid(idev); 1667 } 1668 #endif 1669 1670 /* 1671 * Add prefix route. 1672 */ 1673 1674 static void 1675 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1676 unsigned long expires, u32 flags) 1677 { 1678 struct fib6_config cfg = { 1679 .fc_table = RT6_TABLE_PREFIX, 1680 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1681 .fc_ifindex = dev->ifindex, 1682 .fc_expires = expires, 1683 .fc_dst_len = plen, 1684 .fc_flags = RTF_UP | flags, 1685 .fc_nlinfo.nl_net = dev_net(dev), 1686 .fc_protocol = RTPROT_KERNEL, 1687 }; 1688 1689 cfg.fc_dst = *pfx; 1690 1691 /* Prevent useless cloning on PtP SIT. 1692 This thing is done here expecting that the whole 1693 class of non-broadcast devices need not cloning. 1694 */ 1695 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1696 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1697 cfg.fc_flags |= RTF_NONEXTHOP; 1698 #endif 1699 1700 ip6_route_add(&cfg); 1701 } 1702 1703 1704 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1705 int plen, 1706 const struct net_device *dev, 1707 u32 flags, u32 noflags) 1708 { 1709 struct fib6_node *fn; 1710 struct rt6_info *rt = NULL; 1711 struct fib6_table *table; 1712 1713 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1714 if (table == NULL) 1715 return NULL; 1716 1717 read_lock_bh(&table->tb6_lock); 1718 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1719 if (!fn) 1720 goto out; 1721 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1722 if (rt->dst.dev->ifindex != dev->ifindex) 1723 continue; 1724 if ((rt->rt6i_flags & flags) != flags) 1725 continue; 1726 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0)) 1727 continue; 1728 dst_hold(&rt->dst); 1729 break; 1730 } 1731 out: 1732 read_unlock_bh(&table->tb6_lock); 1733 return rt; 1734 } 1735 1736 1737 /* Create "default" multicast route to the interface */ 1738 1739 static void addrconf_add_mroute(struct net_device *dev) 1740 { 1741 struct fib6_config cfg = { 1742 .fc_table = RT6_TABLE_LOCAL, 1743 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1744 .fc_ifindex = dev->ifindex, 1745 .fc_dst_len = 8, 1746 .fc_flags = RTF_UP, 1747 .fc_nlinfo.nl_net = dev_net(dev), 1748 }; 1749 1750 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1751 1752 ip6_route_add(&cfg); 1753 } 1754 1755 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1756 static void sit_route_add(struct net_device *dev) 1757 { 1758 struct fib6_config cfg = { 1759 .fc_table = RT6_TABLE_MAIN, 1760 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1761 .fc_ifindex = dev->ifindex, 1762 .fc_dst_len = 96, 1763 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1764 .fc_nlinfo.nl_net = dev_net(dev), 1765 }; 1766 1767 /* prefix length - 96 bits "::d.d.d.d" */ 1768 ip6_route_add(&cfg); 1769 } 1770 #endif 1771 1772 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1773 { 1774 struct inet6_dev *idev; 1775 1776 ASSERT_RTNL(); 1777 1778 idev = ipv6_find_idev(dev); 1779 if (!idev) 1780 return ERR_PTR(-ENOBUFS); 1781 1782 if (idev->cnf.disable_ipv6) 1783 return ERR_PTR(-EACCES); 1784 1785 /* Add default multicast route */ 1786 if (!(dev->flags & IFF_LOOPBACK)) 1787 addrconf_add_mroute(dev); 1788 1789 return idev; 1790 } 1791 1792 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 1793 { 1794 struct prefix_info *pinfo; 1795 __u32 valid_lft; 1796 __u32 prefered_lft; 1797 int addr_type; 1798 struct inet6_dev *in6_dev; 1799 struct net *net = dev_net(dev); 1800 1801 pinfo = (struct prefix_info *) opt; 1802 1803 if (len < sizeof(struct prefix_info)) { 1804 ADBG(("addrconf: prefix option too short\n")); 1805 return; 1806 } 1807 1808 /* 1809 * Validation checks ([ADDRCONF], page 19) 1810 */ 1811 1812 addr_type = ipv6_addr_type(&pinfo->prefix); 1813 1814 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1815 return; 1816 1817 valid_lft = ntohl(pinfo->valid); 1818 prefered_lft = ntohl(pinfo->prefered); 1819 1820 if (prefered_lft > valid_lft) { 1821 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 1822 return; 1823 } 1824 1825 in6_dev = in6_dev_get(dev); 1826 1827 if (in6_dev == NULL) { 1828 net_dbg_ratelimited("addrconf: device %s not configured\n", 1829 dev->name); 1830 return; 1831 } 1832 1833 /* 1834 * Two things going on here: 1835 * 1) Add routes for on-link prefixes 1836 * 2) Configure prefixes with the auto flag set 1837 */ 1838 1839 if (pinfo->onlink) { 1840 struct rt6_info *rt; 1841 unsigned long rt_expires; 1842 1843 /* Avoid arithmetic overflow. Really, we could 1844 * save rt_expires in seconds, likely valid_lft, 1845 * but it would require division in fib gc, that it 1846 * not good. 1847 */ 1848 if (HZ > USER_HZ) 1849 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1850 else 1851 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1852 1853 if (addrconf_finite_timeout(rt_expires)) 1854 rt_expires *= HZ; 1855 1856 rt = addrconf_get_prefix_route(&pinfo->prefix, 1857 pinfo->prefix_len, 1858 dev, 1859 RTF_ADDRCONF | RTF_PREFIX_RT, 1860 RTF_GATEWAY | RTF_DEFAULT); 1861 1862 if (rt) { 1863 /* Autoconf prefix route */ 1864 if (valid_lft == 0) { 1865 ip6_del_rt(rt); 1866 rt = NULL; 1867 } else if (addrconf_finite_timeout(rt_expires)) { 1868 /* not infinity */ 1869 rt6_set_expires(rt, jiffies + rt_expires); 1870 } else { 1871 rt6_clean_expires(rt); 1872 } 1873 } else if (valid_lft) { 1874 clock_t expires = 0; 1875 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1876 if (addrconf_finite_timeout(rt_expires)) { 1877 /* not infinity */ 1878 flags |= RTF_EXPIRES; 1879 expires = jiffies_to_clock_t(rt_expires); 1880 } 1881 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1882 dev, expires, flags); 1883 } 1884 if (rt) 1885 dst_release(&rt->dst); 1886 } 1887 1888 /* Try to figure out our local address for this prefix */ 1889 1890 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1891 struct inet6_ifaddr *ifp; 1892 struct in6_addr addr; 1893 int create = 0, update_lft = 0; 1894 1895 if (pinfo->prefix_len == 64) { 1896 memcpy(&addr, &pinfo->prefix, 8); 1897 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1898 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1899 in6_dev_put(in6_dev); 1900 return; 1901 } 1902 goto ok; 1903 } 1904 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 1905 pinfo->prefix_len); 1906 in6_dev_put(in6_dev); 1907 return; 1908 1909 ok: 1910 1911 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1912 1913 if (ifp == NULL && valid_lft) { 1914 int max_addresses = in6_dev->cnf.max_addresses; 1915 u32 addr_flags = 0; 1916 1917 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1918 if (in6_dev->cnf.optimistic_dad && 1919 !net->ipv6.devconf_all->forwarding && sllao) 1920 addr_flags = IFA_F_OPTIMISTIC; 1921 #endif 1922 1923 /* Do not allow to create too much of autoconfigured 1924 * addresses; this would be too easy way to crash kernel. 1925 */ 1926 if (!max_addresses || 1927 ipv6_count_addresses(in6_dev) < max_addresses) 1928 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1929 addr_type&IPV6_ADDR_SCOPE_MASK, 1930 addr_flags); 1931 1932 if (!ifp || IS_ERR(ifp)) { 1933 in6_dev_put(in6_dev); 1934 return; 1935 } 1936 1937 update_lft = create = 1; 1938 ifp->cstamp = jiffies; 1939 addrconf_dad_start(ifp); 1940 } 1941 1942 if (ifp) { 1943 int flags; 1944 unsigned long now; 1945 #ifdef CONFIG_IPV6_PRIVACY 1946 struct inet6_ifaddr *ift; 1947 #endif 1948 u32 stored_lft; 1949 1950 /* update lifetime (RFC2462 5.5.3 e) */ 1951 spin_lock(&ifp->lock); 1952 now = jiffies; 1953 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1954 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1955 else 1956 stored_lft = 0; 1957 if (!update_lft && stored_lft) { 1958 if (valid_lft > MIN_VALID_LIFETIME || 1959 valid_lft > stored_lft) 1960 update_lft = 1; 1961 else if (stored_lft <= MIN_VALID_LIFETIME) { 1962 /* valid_lft <= stored_lft is always true */ 1963 /* 1964 * RFC 4862 Section 5.5.3e: 1965 * "Note that the preferred lifetime of 1966 * the corresponding address is always 1967 * reset to the Preferred Lifetime in 1968 * the received Prefix Information 1969 * option, regardless of whether the 1970 * valid lifetime is also reset or 1971 * ignored." 1972 * 1973 * So if the preferred lifetime in 1974 * this advertisement is different 1975 * than what we have stored, but the 1976 * valid lifetime is invalid, just 1977 * reset prefered_lft. 1978 * 1979 * We must set the valid lifetime 1980 * to the stored lifetime since we'll 1981 * be updating the timestamp below, 1982 * else we'll set it back to the 1983 * minimum. 1984 */ 1985 if (prefered_lft != ifp->prefered_lft) { 1986 valid_lft = stored_lft; 1987 update_lft = 1; 1988 } 1989 } else { 1990 valid_lft = MIN_VALID_LIFETIME; 1991 if (valid_lft < prefered_lft) 1992 prefered_lft = valid_lft; 1993 update_lft = 1; 1994 } 1995 } 1996 1997 if (update_lft) { 1998 ifp->valid_lft = valid_lft; 1999 ifp->prefered_lft = prefered_lft; 2000 ifp->tstamp = now; 2001 flags = ifp->flags; 2002 ifp->flags &= ~IFA_F_DEPRECATED; 2003 spin_unlock(&ifp->lock); 2004 2005 if (!(flags&IFA_F_TENTATIVE)) 2006 ipv6_ifa_notify(0, ifp); 2007 } else 2008 spin_unlock(&ifp->lock); 2009 2010 #ifdef CONFIG_IPV6_PRIVACY 2011 read_lock_bh(&in6_dev->lock); 2012 /* update all temporary addresses in the list */ 2013 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2014 tmp_list) { 2015 int age, max_valid, max_prefered; 2016 2017 if (ifp != ift->ifpub) 2018 continue; 2019 2020 /* 2021 * RFC 4941 section 3.3: 2022 * If a received option will extend the lifetime 2023 * of a public address, the lifetimes of 2024 * temporary addresses should be extended, 2025 * subject to the overall constraint that no 2026 * temporary addresses should ever remain 2027 * "valid" or "preferred" for a time longer than 2028 * (TEMP_VALID_LIFETIME) or 2029 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2030 * respectively. 2031 */ 2032 age = (now - ift->cstamp) / HZ; 2033 max_valid = in6_dev->cnf.temp_valid_lft - age; 2034 if (max_valid < 0) 2035 max_valid = 0; 2036 2037 max_prefered = in6_dev->cnf.temp_prefered_lft - 2038 in6_dev->cnf.max_desync_factor - 2039 age; 2040 if (max_prefered < 0) 2041 max_prefered = 0; 2042 2043 if (valid_lft > max_valid) 2044 valid_lft = max_valid; 2045 2046 if (prefered_lft > max_prefered) 2047 prefered_lft = max_prefered; 2048 2049 spin_lock(&ift->lock); 2050 flags = ift->flags; 2051 ift->valid_lft = valid_lft; 2052 ift->prefered_lft = prefered_lft; 2053 ift->tstamp = now; 2054 if (prefered_lft > 0) 2055 ift->flags &= ~IFA_F_DEPRECATED; 2056 2057 spin_unlock(&ift->lock); 2058 if (!(flags&IFA_F_TENTATIVE)) 2059 ipv6_ifa_notify(0, ift); 2060 } 2061 2062 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2063 /* 2064 * When a new public address is created as 2065 * described in [ADDRCONF], also create a new 2066 * temporary address. Also create a temporary 2067 * address if it's enabled but no temporary 2068 * address currently exists. 2069 */ 2070 read_unlock_bh(&in6_dev->lock); 2071 ipv6_create_tempaddr(ifp, NULL); 2072 } else { 2073 read_unlock_bh(&in6_dev->lock); 2074 } 2075 #endif 2076 in6_ifa_put(ifp); 2077 addrconf_verify(0); 2078 } 2079 } 2080 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2081 in6_dev_put(in6_dev); 2082 } 2083 2084 /* 2085 * Set destination address. 2086 * Special case for SIT interfaces where we create a new "virtual" 2087 * device. 2088 */ 2089 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2090 { 2091 struct in6_ifreq ireq; 2092 struct net_device *dev; 2093 int err = -EINVAL; 2094 2095 rtnl_lock(); 2096 2097 err = -EFAULT; 2098 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2099 goto err_exit; 2100 2101 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2102 2103 err = -ENODEV; 2104 if (dev == NULL) 2105 goto err_exit; 2106 2107 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2108 if (dev->type == ARPHRD_SIT) { 2109 const struct net_device_ops *ops = dev->netdev_ops; 2110 struct ifreq ifr; 2111 struct ip_tunnel_parm p; 2112 2113 err = -EADDRNOTAVAIL; 2114 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2115 goto err_exit; 2116 2117 memset(&p, 0, sizeof(p)); 2118 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2119 p.iph.saddr = 0; 2120 p.iph.version = 4; 2121 p.iph.ihl = 5; 2122 p.iph.protocol = IPPROTO_IPV6; 2123 p.iph.ttl = 64; 2124 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2125 2126 if (ops->ndo_do_ioctl) { 2127 mm_segment_t oldfs = get_fs(); 2128 2129 set_fs(KERNEL_DS); 2130 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2131 set_fs(oldfs); 2132 } else 2133 err = -EOPNOTSUPP; 2134 2135 if (err == 0) { 2136 err = -ENOBUFS; 2137 dev = __dev_get_by_name(net, p.name); 2138 if (!dev) 2139 goto err_exit; 2140 err = dev_open(dev); 2141 } 2142 } 2143 #endif 2144 2145 err_exit: 2146 rtnl_unlock(); 2147 return err; 2148 } 2149 2150 /* 2151 * Manual configuration of address on an interface 2152 */ 2153 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2154 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2155 __u32 valid_lft) 2156 { 2157 struct inet6_ifaddr *ifp; 2158 struct inet6_dev *idev; 2159 struct net_device *dev; 2160 int scope; 2161 u32 flags; 2162 clock_t expires; 2163 unsigned long timeout; 2164 2165 ASSERT_RTNL(); 2166 2167 if (plen > 128) 2168 return -EINVAL; 2169 2170 /* check the lifetime */ 2171 if (!valid_lft || prefered_lft > valid_lft) 2172 return -EINVAL; 2173 2174 dev = __dev_get_by_index(net, ifindex); 2175 if (!dev) 2176 return -ENODEV; 2177 2178 idev = addrconf_add_dev(dev); 2179 if (IS_ERR(idev)) 2180 return PTR_ERR(idev); 2181 2182 scope = ipv6_addr_scope(pfx); 2183 2184 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2185 if (addrconf_finite_timeout(timeout)) { 2186 expires = jiffies_to_clock_t(timeout * HZ); 2187 valid_lft = timeout; 2188 flags = RTF_EXPIRES; 2189 } else { 2190 expires = 0; 2191 flags = 0; 2192 ifa_flags |= IFA_F_PERMANENT; 2193 } 2194 2195 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2196 if (addrconf_finite_timeout(timeout)) { 2197 if (timeout == 0) 2198 ifa_flags |= IFA_F_DEPRECATED; 2199 prefered_lft = timeout; 2200 } 2201 2202 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2203 2204 if (!IS_ERR(ifp)) { 2205 spin_lock_bh(&ifp->lock); 2206 ifp->valid_lft = valid_lft; 2207 ifp->prefered_lft = prefered_lft; 2208 ifp->tstamp = jiffies; 2209 spin_unlock_bh(&ifp->lock); 2210 2211 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2212 expires, flags); 2213 /* 2214 * Note that section 3.1 of RFC 4429 indicates 2215 * that the Optimistic flag should not be set for 2216 * manually configured addresses 2217 */ 2218 addrconf_dad_start(ifp); 2219 in6_ifa_put(ifp); 2220 addrconf_verify(0); 2221 return 0; 2222 } 2223 2224 return PTR_ERR(ifp); 2225 } 2226 2227 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2228 unsigned int plen) 2229 { 2230 struct inet6_ifaddr *ifp; 2231 struct inet6_dev *idev; 2232 struct net_device *dev; 2233 2234 if (plen > 128) 2235 return -EINVAL; 2236 2237 dev = __dev_get_by_index(net, ifindex); 2238 if (!dev) 2239 return -ENODEV; 2240 2241 if ((idev = __in6_dev_get(dev)) == NULL) 2242 return -ENXIO; 2243 2244 read_lock_bh(&idev->lock); 2245 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2246 if (ifp->prefix_len == plen && 2247 ipv6_addr_equal(pfx, &ifp->addr)) { 2248 in6_ifa_hold(ifp); 2249 read_unlock_bh(&idev->lock); 2250 2251 ipv6_del_addr(ifp); 2252 2253 /* If the last address is deleted administratively, 2254 disable IPv6 on this interface. 2255 */ 2256 if (list_empty(&idev->addr_list)) 2257 addrconf_ifdown(idev->dev, 1); 2258 return 0; 2259 } 2260 } 2261 read_unlock_bh(&idev->lock); 2262 return -EADDRNOTAVAIL; 2263 } 2264 2265 2266 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2267 { 2268 struct in6_ifreq ireq; 2269 int err; 2270 2271 if (!capable(CAP_NET_ADMIN)) 2272 return -EPERM; 2273 2274 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2275 return -EFAULT; 2276 2277 rtnl_lock(); 2278 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2279 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2280 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2281 rtnl_unlock(); 2282 return err; 2283 } 2284 2285 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2286 { 2287 struct in6_ifreq ireq; 2288 int err; 2289 2290 if (!capable(CAP_NET_ADMIN)) 2291 return -EPERM; 2292 2293 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2294 return -EFAULT; 2295 2296 rtnl_lock(); 2297 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2298 ireq.ifr6_prefixlen); 2299 rtnl_unlock(); 2300 return err; 2301 } 2302 2303 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2304 int plen, int scope) 2305 { 2306 struct inet6_ifaddr *ifp; 2307 2308 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2309 if (!IS_ERR(ifp)) { 2310 spin_lock_bh(&ifp->lock); 2311 ifp->flags &= ~IFA_F_TENTATIVE; 2312 spin_unlock_bh(&ifp->lock); 2313 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2314 in6_ifa_put(ifp); 2315 } 2316 } 2317 2318 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2319 static void sit_add_v4_addrs(struct inet6_dev *idev) 2320 { 2321 struct in6_addr addr; 2322 struct net_device *dev; 2323 struct net *net = dev_net(idev->dev); 2324 int scope; 2325 2326 ASSERT_RTNL(); 2327 2328 memset(&addr, 0, sizeof(struct in6_addr)); 2329 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2330 2331 if (idev->dev->flags&IFF_POINTOPOINT) { 2332 addr.s6_addr32[0] = htonl(0xfe800000); 2333 scope = IFA_LINK; 2334 } else { 2335 scope = IPV6_ADDR_COMPATv4; 2336 } 2337 2338 if (addr.s6_addr32[3]) { 2339 add_addr(idev, &addr, 128, scope); 2340 return; 2341 } 2342 2343 for_each_netdev(net, dev) { 2344 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2345 if (in_dev && (dev->flags & IFF_UP)) { 2346 struct in_ifaddr *ifa; 2347 2348 int flag = scope; 2349 2350 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2351 int plen; 2352 2353 addr.s6_addr32[3] = ifa->ifa_local; 2354 2355 if (ifa->ifa_scope == RT_SCOPE_LINK) 2356 continue; 2357 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2358 if (idev->dev->flags&IFF_POINTOPOINT) 2359 continue; 2360 flag |= IFA_HOST; 2361 } 2362 if (idev->dev->flags&IFF_POINTOPOINT) 2363 plen = 64; 2364 else 2365 plen = 96; 2366 2367 add_addr(idev, &addr, plen, flag); 2368 } 2369 } 2370 } 2371 } 2372 #endif 2373 2374 static void init_loopback(struct net_device *dev) 2375 { 2376 struct inet6_dev *idev; 2377 2378 /* ::1 */ 2379 2380 ASSERT_RTNL(); 2381 2382 if ((idev = ipv6_find_idev(dev)) == NULL) { 2383 pr_debug("%s: add_dev failed\n", __func__); 2384 return; 2385 } 2386 2387 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2388 } 2389 2390 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2391 { 2392 struct inet6_ifaddr *ifp; 2393 u32 addr_flags = IFA_F_PERMANENT; 2394 2395 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2396 if (idev->cnf.optimistic_dad && 2397 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2398 addr_flags |= IFA_F_OPTIMISTIC; 2399 #endif 2400 2401 2402 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2403 if (!IS_ERR(ifp)) { 2404 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2405 addrconf_dad_start(ifp); 2406 in6_ifa_put(ifp); 2407 } 2408 } 2409 2410 static void addrconf_dev_config(struct net_device *dev) 2411 { 2412 struct in6_addr addr; 2413 struct inet6_dev *idev; 2414 2415 ASSERT_RTNL(); 2416 2417 if ((dev->type != ARPHRD_ETHER) && 2418 (dev->type != ARPHRD_FDDI) && 2419 (dev->type != ARPHRD_ARCNET) && 2420 (dev->type != ARPHRD_INFINIBAND) && 2421 (dev->type != ARPHRD_IEEE802154)) { 2422 /* Alas, we support only Ethernet autoconfiguration. */ 2423 return; 2424 } 2425 2426 idev = addrconf_add_dev(dev); 2427 if (IS_ERR(idev)) 2428 return; 2429 2430 memset(&addr, 0, sizeof(struct in6_addr)); 2431 addr.s6_addr32[0] = htonl(0xFE800000); 2432 2433 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2434 addrconf_add_linklocal(idev, &addr); 2435 } 2436 2437 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2438 static void addrconf_sit_config(struct net_device *dev) 2439 { 2440 struct inet6_dev *idev; 2441 2442 ASSERT_RTNL(); 2443 2444 /* 2445 * Configure the tunnel with one of our IPv4 2446 * addresses... we should configure all of 2447 * our v4 addrs in the tunnel 2448 */ 2449 2450 if ((idev = ipv6_find_idev(dev)) == NULL) { 2451 pr_debug("%s: add_dev failed\n", __func__); 2452 return; 2453 } 2454 2455 if (dev->priv_flags & IFF_ISATAP) { 2456 struct in6_addr addr; 2457 2458 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2459 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2460 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2461 addrconf_add_linklocal(idev, &addr); 2462 return; 2463 } 2464 2465 sit_add_v4_addrs(idev); 2466 2467 if (dev->flags&IFF_POINTOPOINT) 2468 addrconf_add_mroute(dev); 2469 else 2470 sit_route_add(dev); 2471 } 2472 #endif 2473 2474 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2475 static void addrconf_gre_config(struct net_device *dev) 2476 { 2477 struct inet6_dev *idev; 2478 struct in6_addr addr; 2479 2480 pr_info("%s(%s)\n", __func__, dev->name); 2481 2482 ASSERT_RTNL(); 2483 2484 if ((idev = ipv6_find_idev(dev)) == NULL) { 2485 pr_debug("%s: add_dev failed\n", __func__); 2486 return; 2487 } 2488 2489 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2490 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2491 2492 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2493 addrconf_add_linklocal(idev, &addr); 2494 } 2495 #endif 2496 2497 static inline int 2498 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2499 { 2500 struct in6_addr lladdr; 2501 2502 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2503 addrconf_add_linklocal(idev, &lladdr); 2504 return 0; 2505 } 2506 return -1; 2507 } 2508 2509 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2510 { 2511 struct net_device *link_dev; 2512 struct net *net = dev_net(idev->dev); 2513 2514 /* first try to inherit the link-local address from the link device */ 2515 if (idev->dev->iflink && 2516 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2517 if (!ipv6_inherit_linklocal(idev, link_dev)) 2518 return; 2519 } 2520 /* then try to inherit it from any device */ 2521 for_each_netdev(net, link_dev) { 2522 if (!ipv6_inherit_linklocal(idev, link_dev)) 2523 return; 2524 } 2525 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2526 } 2527 2528 /* 2529 * Autoconfigure tunnel with a link-local address so routing protocols, 2530 * DHCPv6, MLD etc. can be run over the virtual link 2531 */ 2532 2533 static void addrconf_ip6_tnl_config(struct net_device *dev) 2534 { 2535 struct inet6_dev *idev; 2536 2537 ASSERT_RTNL(); 2538 2539 idev = addrconf_add_dev(dev); 2540 if (IS_ERR(idev)) { 2541 pr_debug("init ip6-ip6: add_dev failed\n"); 2542 return; 2543 } 2544 ip6_tnl_add_linklocal(idev); 2545 } 2546 2547 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2548 void *data) 2549 { 2550 struct net_device *dev = (struct net_device *) data; 2551 struct inet6_dev *idev = __in6_dev_get(dev); 2552 int run_pending = 0; 2553 int err; 2554 2555 switch (event) { 2556 case NETDEV_REGISTER: 2557 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2558 idev = ipv6_add_dev(dev); 2559 if (!idev) 2560 return notifier_from_errno(-ENOMEM); 2561 } 2562 break; 2563 2564 case NETDEV_UP: 2565 case NETDEV_CHANGE: 2566 if (dev->flags & IFF_SLAVE) 2567 break; 2568 2569 if (event == NETDEV_UP) { 2570 if (!addrconf_qdisc_ok(dev)) { 2571 /* device is not ready yet. */ 2572 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2573 dev->name); 2574 break; 2575 } 2576 2577 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2578 idev = ipv6_add_dev(dev); 2579 2580 if (idev) { 2581 idev->if_flags |= IF_READY; 2582 run_pending = 1; 2583 } 2584 } else { 2585 if (!addrconf_qdisc_ok(dev)) { 2586 /* device is still not ready. */ 2587 break; 2588 } 2589 2590 if (idev) { 2591 if (idev->if_flags & IF_READY) 2592 /* device is already configured. */ 2593 break; 2594 idev->if_flags |= IF_READY; 2595 } 2596 2597 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2598 dev->name); 2599 2600 run_pending = 1; 2601 } 2602 2603 switch (dev->type) { 2604 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2605 case ARPHRD_SIT: 2606 addrconf_sit_config(dev); 2607 break; 2608 #endif 2609 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2610 case ARPHRD_IPGRE: 2611 addrconf_gre_config(dev); 2612 break; 2613 #endif 2614 case ARPHRD_TUNNEL6: 2615 addrconf_ip6_tnl_config(dev); 2616 break; 2617 case ARPHRD_LOOPBACK: 2618 init_loopback(dev); 2619 break; 2620 2621 default: 2622 addrconf_dev_config(dev); 2623 break; 2624 } 2625 2626 if (idev) { 2627 if (run_pending) 2628 addrconf_dad_run(idev); 2629 2630 /* 2631 * If the MTU changed during the interface down, 2632 * when the interface up, the changed MTU must be 2633 * reflected in the idev as well as routers. 2634 */ 2635 if (idev->cnf.mtu6 != dev->mtu && 2636 dev->mtu >= IPV6_MIN_MTU) { 2637 rt6_mtu_change(dev, dev->mtu); 2638 idev->cnf.mtu6 = dev->mtu; 2639 } 2640 idev->tstamp = jiffies; 2641 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2642 2643 /* 2644 * If the changed mtu during down is lower than 2645 * IPV6_MIN_MTU stop IPv6 on this interface. 2646 */ 2647 if (dev->mtu < IPV6_MIN_MTU) 2648 addrconf_ifdown(dev, 1); 2649 } 2650 break; 2651 2652 case NETDEV_CHANGEMTU: 2653 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2654 rt6_mtu_change(dev, dev->mtu); 2655 idev->cnf.mtu6 = dev->mtu; 2656 break; 2657 } 2658 2659 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2660 idev = ipv6_add_dev(dev); 2661 if (idev) 2662 break; 2663 } 2664 2665 /* 2666 * MTU falled under IPV6_MIN_MTU. 2667 * Stop IPv6 on this interface. 2668 */ 2669 2670 case NETDEV_DOWN: 2671 case NETDEV_UNREGISTER: 2672 /* 2673 * Remove all addresses from this interface. 2674 */ 2675 addrconf_ifdown(dev, event != NETDEV_DOWN); 2676 break; 2677 2678 case NETDEV_CHANGENAME: 2679 if (idev) { 2680 snmp6_unregister_dev(idev); 2681 addrconf_sysctl_unregister(idev); 2682 addrconf_sysctl_register(idev); 2683 err = snmp6_register_dev(idev); 2684 if (err) 2685 return notifier_from_errno(err); 2686 } 2687 break; 2688 2689 case NETDEV_PRE_TYPE_CHANGE: 2690 case NETDEV_POST_TYPE_CHANGE: 2691 addrconf_type_change(dev, event); 2692 break; 2693 } 2694 2695 return NOTIFY_OK; 2696 } 2697 2698 /* 2699 * addrconf module should be notified of a device going up 2700 */ 2701 static struct notifier_block ipv6_dev_notf = { 2702 .notifier_call = addrconf_notify, 2703 }; 2704 2705 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2706 { 2707 struct inet6_dev *idev; 2708 ASSERT_RTNL(); 2709 2710 idev = __in6_dev_get(dev); 2711 2712 if (event == NETDEV_POST_TYPE_CHANGE) 2713 ipv6_mc_remap(idev); 2714 else if (event == NETDEV_PRE_TYPE_CHANGE) 2715 ipv6_mc_unmap(idev); 2716 } 2717 2718 static int addrconf_ifdown(struct net_device *dev, int how) 2719 { 2720 struct net *net = dev_net(dev); 2721 struct inet6_dev *idev; 2722 struct inet6_ifaddr *ifa; 2723 int state, i; 2724 2725 ASSERT_RTNL(); 2726 2727 rt6_ifdown(net, dev); 2728 neigh_ifdown(&nd_tbl, dev); 2729 2730 idev = __in6_dev_get(dev); 2731 if (idev == NULL) 2732 return -ENODEV; 2733 2734 /* 2735 * Step 1: remove reference to ipv6 device from parent device. 2736 * Do not dev_put! 2737 */ 2738 if (how) { 2739 idev->dead = 1; 2740 2741 /* protected by rtnl_lock */ 2742 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2743 2744 /* Step 1.5: remove snmp6 entry */ 2745 snmp6_unregister_dev(idev); 2746 2747 } 2748 2749 /* Step 2: clear hash table */ 2750 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2751 struct hlist_head *h = &inet6_addr_lst[i]; 2752 struct hlist_node *n; 2753 2754 spin_lock_bh(&addrconf_hash_lock); 2755 restart: 2756 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2757 if (ifa->idev == idev) { 2758 hlist_del_init_rcu(&ifa->addr_lst); 2759 addrconf_del_timer(ifa); 2760 goto restart; 2761 } 2762 } 2763 spin_unlock_bh(&addrconf_hash_lock); 2764 } 2765 2766 write_lock_bh(&idev->lock); 2767 2768 /* Step 2: clear flags for stateless addrconf */ 2769 if (!how) 2770 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2771 2772 #ifdef CONFIG_IPV6_PRIVACY 2773 if (how && del_timer(&idev->regen_timer)) 2774 in6_dev_put(idev); 2775 2776 /* Step 3: clear tempaddr list */ 2777 while (!list_empty(&idev->tempaddr_list)) { 2778 ifa = list_first_entry(&idev->tempaddr_list, 2779 struct inet6_ifaddr, tmp_list); 2780 list_del(&ifa->tmp_list); 2781 write_unlock_bh(&idev->lock); 2782 spin_lock_bh(&ifa->lock); 2783 2784 if (ifa->ifpub) { 2785 in6_ifa_put(ifa->ifpub); 2786 ifa->ifpub = NULL; 2787 } 2788 spin_unlock_bh(&ifa->lock); 2789 in6_ifa_put(ifa); 2790 write_lock_bh(&idev->lock); 2791 } 2792 #endif 2793 2794 while (!list_empty(&idev->addr_list)) { 2795 ifa = list_first_entry(&idev->addr_list, 2796 struct inet6_ifaddr, if_list); 2797 addrconf_del_timer(ifa); 2798 2799 list_del(&ifa->if_list); 2800 2801 write_unlock_bh(&idev->lock); 2802 2803 spin_lock_bh(&ifa->state_lock); 2804 state = ifa->state; 2805 ifa->state = INET6_IFADDR_STATE_DEAD; 2806 spin_unlock_bh(&ifa->state_lock); 2807 2808 if (state != INET6_IFADDR_STATE_DEAD) { 2809 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2810 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2811 } 2812 in6_ifa_put(ifa); 2813 2814 write_lock_bh(&idev->lock); 2815 } 2816 2817 write_unlock_bh(&idev->lock); 2818 2819 /* Step 5: Discard multicast list */ 2820 if (how) 2821 ipv6_mc_destroy_dev(idev); 2822 else 2823 ipv6_mc_down(idev); 2824 2825 idev->tstamp = jiffies; 2826 2827 /* Last: Shot the device (if unregistered) */ 2828 if (how) { 2829 addrconf_sysctl_unregister(idev); 2830 neigh_parms_release(&nd_tbl, idev->nd_parms); 2831 neigh_ifdown(&nd_tbl, dev); 2832 in6_dev_put(idev); 2833 } 2834 return 0; 2835 } 2836 2837 static void addrconf_rs_timer(unsigned long data) 2838 { 2839 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2840 struct inet6_dev *idev = ifp->idev; 2841 2842 read_lock(&idev->lock); 2843 if (idev->dead || !(idev->if_flags & IF_READY)) 2844 goto out; 2845 2846 if (idev->cnf.forwarding) 2847 goto out; 2848 2849 /* Announcement received after solicitation was sent */ 2850 if (idev->if_flags & IF_RA_RCVD) 2851 goto out; 2852 2853 spin_lock(&ifp->lock); 2854 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2855 /* The wait after the last probe can be shorter */ 2856 addrconf_mod_timer(ifp, AC_RS, 2857 (ifp->probes == idev->cnf.rtr_solicits) ? 2858 idev->cnf.rtr_solicit_delay : 2859 idev->cnf.rtr_solicit_interval); 2860 spin_unlock(&ifp->lock); 2861 2862 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2863 } else { 2864 spin_unlock(&ifp->lock); 2865 /* 2866 * Note: we do not support deprecated "all on-link" 2867 * assumption any longer. 2868 */ 2869 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 2870 } 2871 2872 out: 2873 read_unlock(&idev->lock); 2874 in6_ifa_put(ifp); 2875 } 2876 2877 /* 2878 * Duplicate Address Detection 2879 */ 2880 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2881 { 2882 unsigned long rand_num; 2883 struct inet6_dev *idev = ifp->idev; 2884 2885 if (ifp->flags & IFA_F_OPTIMISTIC) 2886 rand_num = 0; 2887 else 2888 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2889 2890 ifp->probes = idev->cnf.dad_transmits; 2891 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2892 } 2893 2894 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 2895 { 2896 struct inet6_dev *idev = ifp->idev; 2897 struct net_device *dev = idev->dev; 2898 2899 addrconf_join_solict(dev, &ifp->addr); 2900 2901 net_srandom(ifp->addr.s6_addr32[3]); 2902 2903 read_lock_bh(&idev->lock); 2904 spin_lock(&ifp->lock); 2905 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2906 goto out; 2907 2908 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2909 idev->cnf.accept_dad < 1 || 2910 !(ifp->flags&IFA_F_TENTATIVE) || 2911 ifp->flags & IFA_F_NODAD) { 2912 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2913 spin_unlock(&ifp->lock); 2914 read_unlock_bh(&idev->lock); 2915 2916 addrconf_dad_completed(ifp); 2917 return; 2918 } 2919 2920 if (!(idev->if_flags & IF_READY)) { 2921 spin_unlock(&ifp->lock); 2922 read_unlock_bh(&idev->lock); 2923 /* 2924 * If the device is not ready: 2925 * - keep it tentative if it is a permanent address. 2926 * - otherwise, kill it. 2927 */ 2928 in6_ifa_hold(ifp); 2929 addrconf_dad_stop(ifp, 0); 2930 return; 2931 } 2932 2933 /* 2934 * Optimistic nodes can start receiving 2935 * Frames right away 2936 */ 2937 if (ifp->flags & IFA_F_OPTIMISTIC) 2938 ip6_ins_rt(ifp->rt); 2939 2940 addrconf_dad_kick(ifp); 2941 out: 2942 spin_unlock(&ifp->lock); 2943 read_unlock_bh(&idev->lock); 2944 } 2945 2946 static void addrconf_dad_timer(unsigned long data) 2947 { 2948 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2949 struct inet6_dev *idev = ifp->idev; 2950 struct in6_addr mcaddr; 2951 2952 if (!ifp->probes && addrconf_dad_end(ifp)) 2953 goto out; 2954 2955 read_lock(&idev->lock); 2956 if (idev->dead || !(idev->if_flags & IF_READY)) { 2957 read_unlock(&idev->lock); 2958 goto out; 2959 } 2960 2961 spin_lock(&ifp->lock); 2962 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2963 spin_unlock(&ifp->lock); 2964 read_unlock(&idev->lock); 2965 goto out; 2966 } 2967 2968 if (ifp->probes == 0) { 2969 /* 2970 * DAD was successful 2971 */ 2972 2973 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2974 spin_unlock(&ifp->lock); 2975 read_unlock(&idev->lock); 2976 2977 addrconf_dad_completed(ifp); 2978 2979 goto out; 2980 } 2981 2982 ifp->probes--; 2983 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2984 spin_unlock(&ifp->lock); 2985 read_unlock(&idev->lock); 2986 2987 /* send a neighbour solicitation for our addr */ 2988 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2989 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2990 out: 2991 in6_ifa_put(ifp); 2992 } 2993 2994 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2995 { 2996 struct net_device *dev = ifp->idev->dev; 2997 2998 /* 2999 * Configure the address for reception. Now it is valid. 3000 */ 3001 3002 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3003 3004 /* If added prefix is link local and we are prepared to process 3005 router advertisements, start sending router solicitations. 3006 */ 3007 3008 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) || 3009 ifp->idev->cnf.accept_ra == 2) && 3010 ifp->idev->cnf.rtr_solicits > 0 && 3011 (dev->flags&IFF_LOOPBACK) == 0 && 3012 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3013 /* 3014 * If a host as already performed a random delay 3015 * [...] as part of DAD [...] there is no need 3016 * to delay again before sending the first RS 3017 */ 3018 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3019 3020 spin_lock_bh(&ifp->lock); 3021 ifp->probes = 1; 3022 ifp->idev->if_flags |= IF_RS_SENT; 3023 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3024 spin_unlock_bh(&ifp->lock); 3025 } 3026 } 3027 3028 static void addrconf_dad_run(struct inet6_dev *idev) 3029 { 3030 struct inet6_ifaddr *ifp; 3031 3032 read_lock_bh(&idev->lock); 3033 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3034 spin_lock(&ifp->lock); 3035 if (ifp->flags & IFA_F_TENTATIVE && 3036 ifp->state == INET6_IFADDR_STATE_DAD) 3037 addrconf_dad_kick(ifp); 3038 spin_unlock(&ifp->lock); 3039 } 3040 read_unlock_bh(&idev->lock); 3041 } 3042 3043 #ifdef CONFIG_PROC_FS 3044 struct if6_iter_state { 3045 struct seq_net_private p; 3046 int bucket; 3047 int offset; 3048 }; 3049 3050 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3051 { 3052 struct inet6_ifaddr *ifa = NULL; 3053 struct if6_iter_state *state = seq->private; 3054 struct net *net = seq_file_net(seq); 3055 int p = 0; 3056 3057 /* initial bucket if pos is 0 */ 3058 if (pos == 0) { 3059 state->bucket = 0; 3060 state->offset = 0; 3061 } 3062 3063 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3064 struct hlist_node *n; 3065 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3066 addr_lst) { 3067 /* sync with offset */ 3068 if (p < state->offset) { 3069 p++; 3070 continue; 3071 } 3072 state->offset++; 3073 if (net_eq(dev_net(ifa->idev->dev), net)) 3074 return ifa; 3075 } 3076 3077 /* prepare for next bucket */ 3078 state->offset = 0; 3079 p = 0; 3080 } 3081 return NULL; 3082 } 3083 3084 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3085 struct inet6_ifaddr *ifa) 3086 { 3087 struct if6_iter_state *state = seq->private; 3088 struct net *net = seq_file_net(seq); 3089 struct hlist_node *n = &ifa->addr_lst; 3090 3091 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) { 3092 state->offset++; 3093 if (net_eq(dev_net(ifa->idev->dev), net)) 3094 return ifa; 3095 } 3096 3097 while (++state->bucket < IN6_ADDR_HSIZE) { 3098 state->offset = 0; 3099 hlist_for_each_entry_rcu_bh(ifa, n, 3100 &inet6_addr_lst[state->bucket], addr_lst) { 3101 state->offset++; 3102 if (net_eq(dev_net(ifa->idev->dev), net)) 3103 return ifa; 3104 } 3105 } 3106 3107 return NULL; 3108 } 3109 3110 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3111 __acquires(rcu_bh) 3112 { 3113 rcu_read_lock_bh(); 3114 return if6_get_first(seq, *pos); 3115 } 3116 3117 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3118 { 3119 struct inet6_ifaddr *ifa; 3120 3121 ifa = if6_get_next(seq, v); 3122 ++*pos; 3123 return ifa; 3124 } 3125 3126 static void if6_seq_stop(struct seq_file *seq, void *v) 3127 __releases(rcu_bh) 3128 { 3129 rcu_read_unlock_bh(); 3130 } 3131 3132 static int if6_seq_show(struct seq_file *seq, void *v) 3133 { 3134 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3135 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3136 &ifp->addr, 3137 ifp->idev->dev->ifindex, 3138 ifp->prefix_len, 3139 ifp->scope, 3140 ifp->flags, 3141 ifp->idev->dev->name); 3142 return 0; 3143 } 3144 3145 static const struct seq_operations if6_seq_ops = { 3146 .start = if6_seq_start, 3147 .next = if6_seq_next, 3148 .show = if6_seq_show, 3149 .stop = if6_seq_stop, 3150 }; 3151 3152 static int if6_seq_open(struct inode *inode, struct file *file) 3153 { 3154 return seq_open_net(inode, file, &if6_seq_ops, 3155 sizeof(struct if6_iter_state)); 3156 } 3157 3158 static const struct file_operations if6_fops = { 3159 .owner = THIS_MODULE, 3160 .open = if6_seq_open, 3161 .read = seq_read, 3162 .llseek = seq_lseek, 3163 .release = seq_release_net, 3164 }; 3165 3166 static int __net_init if6_proc_net_init(struct net *net) 3167 { 3168 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3169 return -ENOMEM; 3170 return 0; 3171 } 3172 3173 static void __net_exit if6_proc_net_exit(struct net *net) 3174 { 3175 proc_net_remove(net, "if_inet6"); 3176 } 3177 3178 static struct pernet_operations if6_proc_net_ops = { 3179 .init = if6_proc_net_init, 3180 .exit = if6_proc_net_exit, 3181 }; 3182 3183 int __init if6_proc_init(void) 3184 { 3185 return register_pernet_subsys(&if6_proc_net_ops); 3186 } 3187 3188 void if6_proc_exit(void) 3189 { 3190 unregister_pernet_subsys(&if6_proc_net_ops); 3191 } 3192 #endif /* CONFIG_PROC_FS */ 3193 3194 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3195 /* Check if address is a home address configured on any interface. */ 3196 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3197 { 3198 int ret = 0; 3199 struct inet6_ifaddr *ifp = NULL; 3200 struct hlist_node *n; 3201 unsigned int hash = inet6_addr_hash(addr); 3202 3203 rcu_read_lock_bh(); 3204 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3205 if (!net_eq(dev_net(ifp->idev->dev), net)) 3206 continue; 3207 if (ipv6_addr_equal(&ifp->addr, addr) && 3208 (ifp->flags & IFA_F_HOMEADDRESS)) { 3209 ret = 1; 3210 break; 3211 } 3212 } 3213 rcu_read_unlock_bh(); 3214 return ret; 3215 } 3216 #endif 3217 3218 /* 3219 * Periodic address status verification 3220 */ 3221 3222 static void addrconf_verify(unsigned long foo) 3223 { 3224 unsigned long now, next, next_sec, next_sched; 3225 struct inet6_ifaddr *ifp; 3226 struct hlist_node *node; 3227 int i; 3228 3229 rcu_read_lock_bh(); 3230 spin_lock(&addrconf_verify_lock); 3231 now = jiffies; 3232 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3233 3234 del_timer(&addr_chk_timer); 3235 3236 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3237 restart: 3238 hlist_for_each_entry_rcu_bh(ifp, node, 3239 &inet6_addr_lst[i], addr_lst) { 3240 unsigned long age; 3241 3242 if (ifp->flags & IFA_F_PERMANENT) 3243 continue; 3244 3245 spin_lock(&ifp->lock); 3246 /* We try to batch several events at once. */ 3247 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3248 3249 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3250 age >= ifp->valid_lft) { 3251 spin_unlock(&ifp->lock); 3252 in6_ifa_hold(ifp); 3253 ipv6_del_addr(ifp); 3254 goto restart; 3255 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3256 spin_unlock(&ifp->lock); 3257 continue; 3258 } else if (age >= ifp->prefered_lft) { 3259 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3260 int deprecate = 0; 3261 3262 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3263 deprecate = 1; 3264 ifp->flags |= IFA_F_DEPRECATED; 3265 } 3266 3267 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3268 next = ifp->tstamp + ifp->valid_lft * HZ; 3269 3270 spin_unlock(&ifp->lock); 3271 3272 if (deprecate) { 3273 in6_ifa_hold(ifp); 3274 3275 ipv6_ifa_notify(0, ifp); 3276 in6_ifa_put(ifp); 3277 goto restart; 3278 } 3279 #ifdef CONFIG_IPV6_PRIVACY 3280 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3281 !(ifp->flags&IFA_F_TENTATIVE)) { 3282 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3283 ifp->idev->cnf.dad_transmits * 3284 ifp->idev->nd_parms->retrans_time / HZ; 3285 3286 if (age >= ifp->prefered_lft - regen_advance) { 3287 struct inet6_ifaddr *ifpub = ifp->ifpub; 3288 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3289 next = ifp->tstamp + ifp->prefered_lft * HZ; 3290 if (!ifp->regen_count && ifpub) { 3291 ifp->regen_count++; 3292 in6_ifa_hold(ifp); 3293 in6_ifa_hold(ifpub); 3294 spin_unlock(&ifp->lock); 3295 3296 spin_lock(&ifpub->lock); 3297 ifpub->regen_count = 0; 3298 spin_unlock(&ifpub->lock); 3299 ipv6_create_tempaddr(ifpub, ifp); 3300 in6_ifa_put(ifpub); 3301 in6_ifa_put(ifp); 3302 goto restart; 3303 } 3304 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3305 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3306 spin_unlock(&ifp->lock); 3307 #endif 3308 } else { 3309 /* ifp->prefered_lft <= ifp->valid_lft */ 3310 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3311 next = ifp->tstamp + ifp->prefered_lft * HZ; 3312 spin_unlock(&ifp->lock); 3313 } 3314 } 3315 } 3316 3317 next_sec = round_jiffies_up(next); 3318 next_sched = next; 3319 3320 /* If rounded timeout is accurate enough, accept it. */ 3321 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3322 next_sched = next_sec; 3323 3324 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3325 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3326 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3327 3328 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3329 now, next, next_sec, next_sched)); 3330 3331 addr_chk_timer.expires = next_sched; 3332 add_timer(&addr_chk_timer); 3333 spin_unlock(&addrconf_verify_lock); 3334 rcu_read_unlock_bh(); 3335 } 3336 3337 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3338 { 3339 struct in6_addr *pfx = NULL; 3340 3341 if (addr) 3342 pfx = nla_data(addr); 3343 3344 if (local) { 3345 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3346 pfx = NULL; 3347 else 3348 pfx = nla_data(local); 3349 } 3350 3351 return pfx; 3352 } 3353 3354 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3355 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3356 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3357 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3358 }; 3359 3360 static int 3361 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3362 { 3363 struct net *net = sock_net(skb->sk); 3364 struct ifaddrmsg *ifm; 3365 struct nlattr *tb[IFA_MAX+1]; 3366 struct in6_addr *pfx; 3367 int err; 3368 3369 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3370 if (err < 0) 3371 return err; 3372 3373 ifm = nlmsg_data(nlh); 3374 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3375 if (pfx == NULL) 3376 return -EINVAL; 3377 3378 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3379 } 3380 3381 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3382 u32 prefered_lft, u32 valid_lft) 3383 { 3384 u32 flags; 3385 clock_t expires; 3386 unsigned long timeout; 3387 3388 if (!valid_lft || (prefered_lft > valid_lft)) 3389 return -EINVAL; 3390 3391 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3392 if (addrconf_finite_timeout(timeout)) { 3393 expires = jiffies_to_clock_t(timeout * HZ); 3394 valid_lft = timeout; 3395 flags = RTF_EXPIRES; 3396 } else { 3397 expires = 0; 3398 flags = 0; 3399 ifa_flags |= IFA_F_PERMANENT; 3400 } 3401 3402 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3403 if (addrconf_finite_timeout(timeout)) { 3404 if (timeout == 0) 3405 ifa_flags |= IFA_F_DEPRECATED; 3406 prefered_lft = timeout; 3407 } 3408 3409 spin_lock_bh(&ifp->lock); 3410 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3411 ifp->tstamp = jiffies; 3412 ifp->valid_lft = valid_lft; 3413 ifp->prefered_lft = prefered_lft; 3414 3415 spin_unlock_bh(&ifp->lock); 3416 if (!(ifp->flags&IFA_F_TENTATIVE)) 3417 ipv6_ifa_notify(0, ifp); 3418 3419 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3420 expires, flags); 3421 addrconf_verify(0); 3422 3423 return 0; 3424 } 3425 3426 static int 3427 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3428 { 3429 struct net *net = sock_net(skb->sk); 3430 struct ifaddrmsg *ifm; 3431 struct nlattr *tb[IFA_MAX+1]; 3432 struct in6_addr *pfx; 3433 struct inet6_ifaddr *ifa; 3434 struct net_device *dev; 3435 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3436 u8 ifa_flags; 3437 int err; 3438 3439 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3440 if (err < 0) 3441 return err; 3442 3443 ifm = nlmsg_data(nlh); 3444 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3445 if (pfx == NULL) 3446 return -EINVAL; 3447 3448 if (tb[IFA_CACHEINFO]) { 3449 struct ifa_cacheinfo *ci; 3450 3451 ci = nla_data(tb[IFA_CACHEINFO]); 3452 valid_lft = ci->ifa_valid; 3453 preferred_lft = ci->ifa_prefered; 3454 } else { 3455 preferred_lft = INFINITY_LIFE_TIME; 3456 valid_lft = INFINITY_LIFE_TIME; 3457 } 3458 3459 dev = __dev_get_by_index(net, ifm->ifa_index); 3460 if (dev == NULL) 3461 return -ENODEV; 3462 3463 /* We ignore other flags so far. */ 3464 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3465 3466 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3467 if (ifa == NULL) { 3468 /* 3469 * It would be best to check for !NLM_F_CREATE here but 3470 * userspace alreay relies on not having to provide this. 3471 */ 3472 return inet6_addr_add(net, ifm->ifa_index, pfx, 3473 ifm->ifa_prefixlen, ifa_flags, 3474 preferred_lft, valid_lft); 3475 } 3476 3477 if (nlh->nlmsg_flags & NLM_F_EXCL || 3478 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3479 err = -EEXIST; 3480 else 3481 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3482 3483 in6_ifa_put(ifa); 3484 3485 return err; 3486 } 3487 3488 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3489 u8 scope, int ifindex) 3490 { 3491 struct ifaddrmsg *ifm; 3492 3493 ifm = nlmsg_data(nlh); 3494 ifm->ifa_family = AF_INET6; 3495 ifm->ifa_prefixlen = prefixlen; 3496 ifm->ifa_flags = flags; 3497 ifm->ifa_scope = scope; 3498 ifm->ifa_index = ifindex; 3499 } 3500 3501 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3502 unsigned long tstamp, u32 preferred, u32 valid) 3503 { 3504 struct ifa_cacheinfo ci; 3505 3506 ci.cstamp = cstamp_delta(cstamp); 3507 ci.tstamp = cstamp_delta(tstamp); 3508 ci.ifa_prefered = preferred; 3509 ci.ifa_valid = valid; 3510 3511 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3512 } 3513 3514 static inline int rt_scope(int ifa_scope) 3515 { 3516 if (ifa_scope & IFA_HOST) 3517 return RT_SCOPE_HOST; 3518 else if (ifa_scope & IFA_LINK) 3519 return RT_SCOPE_LINK; 3520 else if (ifa_scope & IFA_SITE) 3521 return RT_SCOPE_SITE; 3522 else 3523 return RT_SCOPE_UNIVERSE; 3524 } 3525 3526 static inline int inet6_ifaddr_msgsize(void) 3527 { 3528 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3529 + nla_total_size(16) /* IFA_ADDRESS */ 3530 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3531 } 3532 3533 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3534 u32 portid, u32 seq, int event, unsigned int flags) 3535 { 3536 struct nlmsghdr *nlh; 3537 u32 preferred, valid; 3538 3539 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3540 if (nlh == NULL) 3541 return -EMSGSIZE; 3542 3543 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3544 ifa->idev->dev->ifindex); 3545 3546 if (!(ifa->flags&IFA_F_PERMANENT)) { 3547 preferred = ifa->prefered_lft; 3548 valid = ifa->valid_lft; 3549 if (preferred != INFINITY_LIFE_TIME) { 3550 long tval = (jiffies - ifa->tstamp)/HZ; 3551 if (preferred > tval) 3552 preferred -= tval; 3553 else 3554 preferred = 0; 3555 if (valid != INFINITY_LIFE_TIME) { 3556 if (valid > tval) 3557 valid -= tval; 3558 else 3559 valid = 0; 3560 } 3561 } 3562 } else { 3563 preferred = INFINITY_LIFE_TIME; 3564 valid = INFINITY_LIFE_TIME; 3565 } 3566 3567 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3568 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3569 nlmsg_cancel(skb, nlh); 3570 return -EMSGSIZE; 3571 } 3572 3573 return nlmsg_end(skb, nlh); 3574 } 3575 3576 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3577 u32 portid, u32 seq, int event, u16 flags) 3578 { 3579 struct nlmsghdr *nlh; 3580 u8 scope = RT_SCOPE_UNIVERSE; 3581 int ifindex = ifmca->idev->dev->ifindex; 3582 3583 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3584 scope = RT_SCOPE_SITE; 3585 3586 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3587 if (nlh == NULL) 3588 return -EMSGSIZE; 3589 3590 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3591 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3592 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3593 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3594 nlmsg_cancel(skb, nlh); 3595 return -EMSGSIZE; 3596 } 3597 3598 return nlmsg_end(skb, nlh); 3599 } 3600 3601 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3602 u32 portid, u32 seq, int event, unsigned int flags) 3603 { 3604 struct nlmsghdr *nlh; 3605 u8 scope = RT_SCOPE_UNIVERSE; 3606 int ifindex = ifaca->aca_idev->dev->ifindex; 3607 3608 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3609 scope = RT_SCOPE_SITE; 3610 3611 nlh = nlmsg_put(skb, portid, 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_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3617 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_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 enum addr_type_t { 3627 UNICAST_ADDR, 3628 MULTICAST_ADDR, 3629 ANYCAST_ADDR, 3630 }; 3631 3632 /* called with rcu_read_lock() */ 3633 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3634 struct netlink_callback *cb, enum addr_type_t type, 3635 int s_ip_idx, int *p_ip_idx) 3636 { 3637 struct ifmcaddr6 *ifmca; 3638 struct ifacaddr6 *ifaca; 3639 int err = 1; 3640 int ip_idx = *p_ip_idx; 3641 3642 read_lock_bh(&idev->lock); 3643 switch (type) { 3644 case UNICAST_ADDR: { 3645 struct inet6_ifaddr *ifa; 3646 3647 /* unicast address incl. temp addr */ 3648 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3649 if (++ip_idx < s_ip_idx) 3650 continue; 3651 err = inet6_fill_ifaddr(skb, ifa, 3652 NETLINK_CB(cb->skb).portid, 3653 cb->nlh->nlmsg_seq, 3654 RTM_NEWADDR, 3655 NLM_F_MULTI); 3656 if (err <= 0) 3657 break; 3658 } 3659 break; 3660 } 3661 case MULTICAST_ADDR: 3662 /* multicast address */ 3663 for (ifmca = idev->mc_list; ifmca; 3664 ifmca = ifmca->next, ip_idx++) { 3665 if (ip_idx < s_ip_idx) 3666 continue; 3667 err = inet6_fill_ifmcaddr(skb, ifmca, 3668 NETLINK_CB(cb->skb).portid, 3669 cb->nlh->nlmsg_seq, 3670 RTM_GETMULTICAST, 3671 NLM_F_MULTI); 3672 if (err <= 0) 3673 break; 3674 } 3675 break; 3676 case ANYCAST_ADDR: 3677 /* anycast address */ 3678 for (ifaca = idev->ac_list; ifaca; 3679 ifaca = ifaca->aca_next, ip_idx++) { 3680 if (ip_idx < s_ip_idx) 3681 continue; 3682 err = inet6_fill_ifacaddr(skb, ifaca, 3683 NETLINK_CB(cb->skb).portid, 3684 cb->nlh->nlmsg_seq, 3685 RTM_GETANYCAST, 3686 NLM_F_MULTI); 3687 if (err <= 0) 3688 break; 3689 } 3690 break; 3691 default: 3692 break; 3693 } 3694 read_unlock_bh(&idev->lock); 3695 *p_ip_idx = ip_idx; 3696 return err; 3697 } 3698 3699 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3700 enum addr_type_t type) 3701 { 3702 struct net *net = sock_net(skb->sk); 3703 int h, s_h; 3704 int idx, ip_idx; 3705 int s_idx, s_ip_idx; 3706 struct net_device *dev; 3707 struct inet6_dev *idev; 3708 struct hlist_head *head; 3709 struct hlist_node *node; 3710 3711 s_h = cb->args[0]; 3712 s_idx = idx = cb->args[1]; 3713 s_ip_idx = ip_idx = cb->args[2]; 3714 3715 rcu_read_lock(); 3716 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3717 idx = 0; 3718 head = &net->dev_index_head[h]; 3719 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3720 if (idx < s_idx) 3721 goto cont; 3722 if (h > s_h || idx > s_idx) 3723 s_ip_idx = 0; 3724 ip_idx = 0; 3725 idev = __in6_dev_get(dev); 3726 if (!idev) 3727 goto cont; 3728 3729 if (in6_dump_addrs(idev, skb, cb, type, 3730 s_ip_idx, &ip_idx) <= 0) 3731 goto done; 3732 cont: 3733 idx++; 3734 } 3735 } 3736 done: 3737 rcu_read_unlock(); 3738 cb->args[0] = h; 3739 cb->args[1] = idx; 3740 cb->args[2] = ip_idx; 3741 3742 return skb->len; 3743 } 3744 3745 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3746 { 3747 enum addr_type_t type = UNICAST_ADDR; 3748 3749 return inet6_dump_addr(skb, cb, type); 3750 } 3751 3752 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3753 { 3754 enum addr_type_t type = MULTICAST_ADDR; 3755 3756 return inet6_dump_addr(skb, cb, type); 3757 } 3758 3759 3760 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3761 { 3762 enum addr_type_t type = ANYCAST_ADDR; 3763 3764 return inet6_dump_addr(skb, cb, type); 3765 } 3766 3767 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 3768 void *arg) 3769 { 3770 struct net *net = sock_net(in_skb->sk); 3771 struct ifaddrmsg *ifm; 3772 struct nlattr *tb[IFA_MAX+1]; 3773 struct in6_addr *addr = NULL; 3774 struct net_device *dev = NULL; 3775 struct inet6_ifaddr *ifa; 3776 struct sk_buff *skb; 3777 int err; 3778 3779 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3780 if (err < 0) 3781 goto errout; 3782 3783 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3784 if (addr == NULL) { 3785 err = -EINVAL; 3786 goto errout; 3787 } 3788 3789 ifm = nlmsg_data(nlh); 3790 if (ifm->ifa_index) 3791 dev = __dev_get_by_index(net, ifm->ifa_index); 3792 3793 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3794 if (!ifa) { 3795 err = -EADDRNOTAVAIL; 3796 goto errout; 3797 } 3798 3799 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3800 if (!skb) { 3801 err = -ENOBUFS; 3802 goto errout_ifa; 3803 } 3804 3805 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 3806 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3807 if (err < 0) { 3808 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3809 WARN_ON(err == -EMSGSIZE); 3810 kfree_skb(skb); 3811 goto errout_ifa; 3812 } 3813 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 3814 errout_ifa: 3815 in6_ifa_put(ifa); 3816 errout: 3817 return err; 3818 } 3819 3820 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3821 { 3822 struct sk_buff *skb; 3823 struct net *net = dev_net(ifa->idev->dev); 3824 int err = -ENOBUFS; 3825 3826 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3827 if (skb == NULL) 3828 goto errout; 3829 3830 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3831 if (err < 0) { 3832 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3833 WARN_ON(err == -EMSGSIZE); 3834 kfree_skb(skb); 3835 goto errout; 3836 } 3837 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3838 return; 3839 errout: 3840 if (err < 0) 3841 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3842 } 3843 3844 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3845 __s32 *array, int bytes) 3846 { 3847 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3848 3849 memset(array, 0, bytes); 3850 array[DEVCONF_FORWARDING] = cnf->forwarding; 3851 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3852 array[DEVCONF_MTU6] = cnf->mtu6; 3853 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3854 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3855 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3856 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3857 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3858 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3859 jiffies_to_msecs(cnf->rtr_solicit_interval); 3860 array[DEVCONF_RTR_SOLICIT_DELAY] = 3861 jiffies_to_msecs(cnf->rtr_solicit_delay); 3862 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3863 #ifdef CONFIG_IPV6_PRIVACY 3864 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3865 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3866 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3867 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3868 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3869 #endif 3870 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3871 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3872 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3873 #ifdef CONFIG_IPV6_ROUTER_PREF 3874 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3875 array[DEVCONF_RTR_PROBE_INTERVAL] = 3876 jiffies_to_msecs(cnf->rtr_probe_interval); 3877 #ifdef CONFIG_IPV6_ROUTE_INFO 3878 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3879 #endif 3880 #endif 3881 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3882 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3883 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3884 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3885 #endif 3886 #ifdef CONFIG_IPV6_MROUTE 3887 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3888 #endif 3889 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3890 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3891 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3892 } 3893 3894 static inline size_t inet6_ifla6_size(void) 3895 { 3896 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3897 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3898 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3899 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3900 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3901 } 3902 3903 static inline size_t inet6_if_nlmsg_size(void) 3904 { 3905 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3906 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3907 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3908 + nla_total_size(4) /* IFLA_MTU */ 3909 + nla_total_size(4) /* IFLA_LINK */ 3910 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3911 } 3912 3913 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3914 int items, int bytes) 3915 { 3916 int i; 3917 int pad = bytes - sizeof(u64) * items; 3918 BUG_ON(pad < 0); 3919 3920 /* Use put_unaligned() because stats may not be aligned for u64. */ 3921 put_unaligned(items, &stats[0]); 3922 for (i = 1; i < items; i++) 3923 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3924 3925 memset(&stats[items], 0, pad); 3926 } 3927 3928 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3929 int items, int bytes, size_t syncpoff) 3930 { 3931 int i; 3932 int pad = bytes - sizeof(u64) * items; 3933 BUG_ON(pad < 0); 3934 3935 /* Use put_unaligned() because stats may not be aligned for u64. */ 3936 put_unaligned(items, &stats[0]); 3937 for (i = 1; i < items; i++) 3938 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3939 3940 memset(&stats[items], 0, pad); 3941 } 3942 3943 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3944 int bytes) 3945 { 3946 switch (attrtype) { 3947 case IFLA_INET6_STATS: 3948 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3949 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3950 break; 3951 case IFLA_INET6_ICMP6STATS: 3952 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3953 break; 3954 } 3955 } 3956 3957 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3958 { 3959 struct nlattr *nla; 3960 struct ifla_cacheinfo ci; 3961 3962 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 3963 goto nla_put_failure; 3964 ci.max_reasm_len = IPV6_MAXPLEN; 3965 ci.tstamp = cstamp_delta(idev->tstamp); 3966 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3967 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3968 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 3969 goto nla_put_failure; 3970 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3971 if (nla == NULL) 3972 goto nla_put_failure; 3973 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3974 3975 /* XXX - MC not implemented */ 3976 3977 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3978 if (nla == NULL) 3979 goto nla_put_failure; 3980 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3981 3982 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3983 if (nla == NULL) 3984 goto nla_put_failure; 3985 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3986 3987 return 0; 3988 3989 nla_put_failure: 3990 return -EMSGSIZE; 3991 } 3992 3993 static size_t inet6_get_link_af_size(const struct net_device *dev) 3994 { 3995 if (!__in6_dev_get(dev)) 3996 return 0; 3997 3998 return inet6_ifla6_size(); 3999 } 4000 4001 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4002 { 4003 struct inet6_dev *idev = __in6_dev_get(dev); 4004 4005 if (!idev) 4006 return -ENODATA; 4007 4008 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4009 return -EMSGSIZE; 4010 4011 return 0; 4012 } 4013 4014 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4015 u32 portid, u32 seq, int event, unsigned int flags) 4016 { 4017 struct net_device *dev = idev->dev; 4018 struct ifinfomsg *hdr; 4019 struct nlmsghdr *nlh; 4020 void *protoinfo; 4021 4022 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4023 if (nlh == NULL) 4024 return -EMSGSIZE; 4025 4026 hdr = nlmsg_data(nlh); 4027 hdr->ifi_family = AF_INET6; 4028 hdr->__ifi_pad = 0; 4029 hdr->ifi_type = dev->type; 4030 hdr->ifi_index = dev->ifindex; 4031 hdr->ifi_flags = dev_get_flags(dev); 4032 hdr->ifi_change = 0; 4033 4034 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4035 (dev->addr_len && 4036 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4037 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4038 (dev->ifindex != dev->iflink && 4039 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4040 goto nla_put_failure; 4041 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4042 if (protoinfo == NULL) 4043 goto nla_put_failure; 4044 4045 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4046 goto nla_put_failure; 4047 4048 nla_nest_end(skb, protoinfo); 4049 return nlmsg_end(skb, nlh); 4050 4051 nla_put_failure: 4052 nlmsg_cancel(skb, nlh); 4053 return -EMSGSIZE; 4054 } 4055 4056 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4057 { 4058 struct net *net = sock_net(skb->sk); 4059 int h, s_h; 4060 int idx = 0, s_idx; 4061 struct net_device *dev; 4062 struct inet6_dev *idev; 4063 struct hlist_head *head; 4064 struct hlist_node *node; 4065 4066 s_h = cb->args[0]; 4067 s_idx = cb->args[1]; 4068 4069 rcu_read_lock(); 4070 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4071 idx = 0; 4072 head = &net->dev_index_head[h]; 4073 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4074 if (idx < s_idx) 4075 goto cont; 4076 idev = __in6_dev_get(dev); 4077 if (!idev) 4078 goto cont; 4079 if (inet6_fill_ifinfo(skb, idev, 4080 NETLINK_CB(cb->skb).portid, 4081 cb->nlh->nlmsg_seq, 4082 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4083 goto out; 4084 cont: 4085 idx++; 4086 } 4087 } 4088 out: 4089 rcu_read_unlock(); 4090 cb->args[1] = idx; 4091 cb->args[0] = h; 4092 4093 return skb->len; 4094 } 4095 4096 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4097 { 4098 struct sk_buff *skb; 4099 struct net *net = dev_net(idev->dev); 4100 int err = -ENOBUFS; 4101 4102 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4103 if (skb == NULL) 4104 goto errout; 4105 4106 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4107 if (err < 0) { 4108 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4109 WARN_ON(err == -EMSGSIZE); 4110 kfree_skb(skb); 4111 goto errout; 4112 } 4113 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4114 return; 4115 errout: 4116 if (err < 0) 4117 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4118 } 4119 4120 static inline size_t inet6_prefix_nlmsg_size(void) 4121 { 4122 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4123 + nla_total_size(sizeof(struct in6_addr)) 4124 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4125 } 4126 4127 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4128 struct prefix_info *pinfo, u32 portid, u32 seq, 4129 int event, unsigned int flags) 4130 { 4131 struct prefixmsg *pmsg; 4132 struct nlmsghdr *nlh; 4133 struct prefix_cacheinfo ci; 4134 4135 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4136 if (nlh == NULL) 4137 return -EMSGSIZE; 4138 4139 pmsg = nlmsg_data(nlh); 4140 pmsg->prefix_family = AF_INET6; 4141 pmsg->prefix_pad1 = 0; 4142 pmsg->prefix_pad2 = 0; 4143 pmsg->prefix_ifindex = idev->dev->ifindex; 4144 pmsg->prefix_len = pinfo->prefix_len; 4145 pmsg->prefix_type = pinfo->type; 4146 pmsg->prefix_pad3 = 0; 4147 pmsg->prefix_flags = 0; 4148 if (pinfo->onlink) 4149 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4150 if (pinfo->autoconf) 4151 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4152 4153 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4154 goto nla_put_failure; 4155 ci.preferred_time = ntohl(pinfo->prefered); 4156 ci.valid_time = ntohl(pinfo->valid); 4157 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4158 goto nla_put_failure; 4159 return nlmsg_end(skb, nlh); 4160 4161 nla_put_failure: 4162 nlmsg_cancel(skb, nlh); 4163 return -EMSGSIZE; 4164 } 4165 4166 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4167 struct prefix_info *pinfo) 4168 { 4169 struct sk_buff *skb; 4170 struct net *net = dev_net(idev->dev); 4171 int err = -ENOBUFS; 4172 4173 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4174 if (skb == NULL) 4175 goto errout; 4176 4177 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4178 if (err < 0) { 4179 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4180 WARN_ON(err == -EMSGSIZE); 4181 kfree_skb(skb); 4182 goto errout; 4183 } 4184 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4185 return; 4186 errout: 4187 if (err < 0) 4188 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4189 } 4190 4191 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4192 { 4193 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4194 4195 switch (event) { 4196 case RTM_NEWADDR: 4197 /* 4198 * If the address was optimistic 4199 * we inserted the route at the start of 4200 * our DAD process, so we don't need 4201 * to do it again 4202 */ 4203 if (!(ifp->rt->rt6i_node)) 4204 ip6_ins_rt(ifp->rt); 4205 if (ifp->idev->cnf.forwarding) 4206 addrconf_join_anycast(ifp); 4207 break; 4208 case RTM_DELADDR: 4209 if (ifp->idev->cnf.forwarding) 4210 addrconf_leave_anycast(ifp); 4211 addrconf_leave_solict(ifp->idev, &ifp->addr); 4212 dst_hold(&ifp->rt->dst); 4213 4214 if (ip6_del_rt(ifp->rt)) 4215 dst_free(&ifp->rt->dst); 4216 break; 4217 } 4218 } 4219 4220 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4221 { 4222 rcu_read_lock_bh(); 4223 if (likely(ifp->idev->dead == 0)) 4224 __ipv6_ifa_notify(event, ifp); 4225 rcu_read_unlock_bh(); 4226 } 4227 4228 #ifdef CONFIG_SYSCTL 4229 4230 static 4231 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4232 void __user *buffer, size_t *lenp, loff_t *ppos) 4233 { 4234 int *valp = ctl->data; 4235 int val = *valp; 4236 loff_t pos = *ppos; 4237 ctl_table lctl; 4238 int ret; 4239 4240 /* 4241 * ctl->data points to idev->cnf.forwarding, we should 4242 * not modify it until we get the rtnl lock. 4243 */ 4244 lctl = *ctl; 4245 lctl.data = &val; 4246 4247 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4248 4249 if (write) 4250 ret = addrconf_fixup_forwarding(ctl, valp, val); 4251 if (ret) 4252 *ppos = pos; 4253 return ret; 4254 } 4255 4256 static void dev_disable_change(struct inet6_dev *idev) 4257 { 4258 if (!idev || !idev->dev) 4259 return; 4260 4261 if (idev->cnf.disable_ipv6) 4262 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4263 else 4264 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4265 } 4266 4267 static void addrconf_disable_change(struct net *net, __s32 newf) 4268 { 4269 struct net_device *dev; 4270 struct inet6_dev *idev; 4271 4272 rcu_read_lock(); 4273 for_each_netdev_rcu(net, dev) { 4274 idev = __in6_dev_get(dev); 4275 if (idev) { 4276 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4277 idev->cnf.disable_ipv6 = newf; 4278 if (changed) 4279 dev_disable_change(idev); 4280 } 4281 } 4282 rcu_read_unlock(); 4283 } 4284 4285 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4286 { 4287 struct net *net; 4288 int old; 4289 4290 if (!rtnl_trylock()) 4291 return restart_syscall(); 4292 4293 net = (struct net *)table->extra2; 4294 old = *p; 4295 *p = newf; 4296 4297 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4298 rtnl_unlock(); 4299 return 0; 4300 } 4301 4302 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4303 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4304 addrconf_disable_change(net, newf); 4305 } else if ((!newf) ^ (!old)) 4306 dev_disable_change((struct inet6_dev *)table->extra1); 4307 4308 rtnl_unlock(); 4309 return 0; 4310 } 4311 4312 static 4313 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4314 void __user *buffer, size_t *lenp, loff_t *ppos) 4315 { 4316 int *valp = ctl->data; 4317 int val = *valp; 4318 loff_t pos = *ppos; 4319 ctl_table lctl; 4320 int ret; 4321 4322 /* 4323 * ctl->data points to idev->cnf.disable_ipv6, we should 4324 * not modify it until we get the rtnl lock. 4325 */ 4326 lctl = *ctl; 4327 lctl.data = &val; 4328 4329 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4330 4331 if (write) 4332 ret = addrconf_disable_ipv6(ctl, valp, val); 4333 if (ret) 4334 *ppos = pos; 4335 return ret; 4336 } 4337 4338 static struct addrconf_sysctl_table 4339 { 4340 struct ctl_table_header *sysctl_header; 4341 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4342 } addrconf_sysctl __read_mostly = { 4343 .sysctl_header = NULL, 4344 .addrconf_vars = { 4345 { 4346 .procname = "forwarding", 4347 .data = &ipv6_devconf.forwarding, 4348 .maxlen = sizeof(int), 4349 .mode = 0644, 4350 .proc_handler = addrconf_sysctl_forward, 4351 }, 4352 { 4353 .procname = "hop_limit", 4354 .data = &ipv6_devconf.hop_limit, 4355 .maxlen = sizeof(int), 4356 .mode = 0644, 4357 .proc_handler = proc_dointvec, 4358 }, 4359 { 4360 .procname = "mtu", 4361 .data = &ipv6_devconf.mtu6, 4362 .maxlen = sizeof(int), 4363 .mode = 0644, 4364 .proc_handler = proc_dointvec, 4365 }, 4366 { 4367 .procname = "accept_ra", 4368 .data = &ipv6_devconf.accept_ra, 4369 .maxlen = sizeof(int), 4370 .mode = 0644, 4371 .proc_handler = proc_dointvec, 4372 }, 4373 { 4374 .procname = "accept_redirects", 4375 .data = &ipv6_devconf.accept_redirects, 4376 .maxlen = sizeof(int), 4377 .mode = 0644, 4378 .proc_handler = proc_dointvec, 4379 }, 4380 { 4381 .procname = "autoconf", 4382 .data = &ipv6_devconf.autoconf, 4383 .maxlen = sizeof(int), 4384 .mode = 0644, 4385 .proc_handler = proc_dointvec, 4386 }, 4387 { 4388 .procname = "dad_transmits", 4389 .data = &ipv6_devconf.dad_transmits, 4390 .maxlen = sizeof(int), 4391 .mode = 0644, 4392 .proc_handler = proc_dointvec, 4393 }, 4394 { 4395 .procname = "router_solicitations", 4396 .data = &ipv6_devconf.rtr_solicits, 4397 .maxlen = sizeof(int), 4398 .mode = 0644, 4399 .proc_handler = proc_dointvec, 4400 }, 4401 { 4402 .procname = "router_solicitation_interval", 4403 .data = &ipv6_devconf.rtr_solicit_interval, 4404 .maxlen = sizeof(int), 4405 .mode = 0644, 4406 .proc_handler = proc_dointvec_jiffies, 4407 }, 4408 { 4409 .procname = "router_solicitation_delay", 4410 .data = &ipv6_devconf.rtr_solicit_delay, 4411 .maxlen = sizeof(int), 4412 .mode = 0644, 4413 .proc_handler = proc_dointvec_jiffies, 4414 }, 4415 { 4416 .procname = "force_mld_version", 4417 .data = &ipv6_devconf.force_mld_version, 4418 .maxlen = sizeof(int), 4419 .mode = 0644, 4420 .proc_handler = proc_dointvec, 4421 }, 4422 #ifdef CONFIG_IPV6_PRIVACY 4423 { 4424 .procname = "use_tempaddr", 4425 .data = &ipv6_devconf.use_tempaddr, 4426 .maxlen = sizeof(int), 4427 .mode = 0644, 4428 .proc_handler = proc_dointvec, 4429 }, 4430 { 4431 .procname = "temp_valid_lft", 4432 .data = &ipv6_devconf.temp_valid_lft, 4433 .maxlen = sizeof(int), 4434 .mode = 0644, 4435 .proc_handler = proc_dointvec, 4436 }, 4437 { 4438 .procname = "temp_prefered_lft", 4439 .data = &ipv6_devconf.temp_prefered_lft, 4440 .maxlen = sizeof(int), 4441 .mode = 0644, 4442 .proc_handler = proc_dointvec, 4443 }, 4444 { 4445 .procname = "regen_max_retry", 4446 .data = &ipv6_devconf.regen_max_retry, 4447 .maxlen = sizeof(int), 4448 .mode = 0644, 4449 .proc_handler = proc_dointvec, 4450 }, 4451 { 4452 .procname = "max_desync_factor", 4453 .data = &ipv6_devconf.max_desync_factor, 4454 .maxlen = sizeof(int), 4455 .mode = 0644, 4456 .proc_handler = proc_dointvec, 4457 }, 4458 #endif 4459 { 4460 .procname = "max_addresses", 4461 .data = &ipv6_devconf.max_addresses, 4462 .maxlen = sizeof(int), 4463 .mode = 0644, 4464 .proc_handler = proc_dointvec, 4465 }, 4466 { 4467 .procname = "accept_ra_defrtr", 4468 .data = &ipv6_devconf.accept_ra_defrtr, 4469 .maxlen = sizeof(int), 4470 .mode = 0644, 4471 .proc_handler = proc_dointvec, 4472 }, 4473 { 4474 .procname = "accept_ra_pinfo", 4475 .data = &ipv6_devconf.accept_ra_pinfo, 4476 .maxlen = sizeof(int), 4477 .mode = 0644, 4478 .proc_handler = proc_dointvec, 4479 }, 4480 #ifdef CONFIG_IPV6_ROUTER_PREF 4481 { 4482 .procname = "accept_ra_rtr_pref", 4483 .data = &ipv6_devconf.accept_ra_rtr_pref, 4484 .maxlen = sizeof(int), 4485 .mode = 0644, 4486 .proc_handler = proc_dointvec, 4487 }, 4488 { 4489 .procname = "router_probe_interval", 4490 .data = &ipv6_devconf.rtr_probe_interval, 4491 .maxlen = sizeof(int), 4492 .mode = 0644, 4493 .proc_handler = proc_dointvec_jiffies, 4494 }, 4495 #ifdef CONFIG_IPV6_ROUTE_INFO 4496 { 4497 .procname = "accept_ra_rt_info_max_plen", 4498 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4499 .maxlen = sizeof(int), 4500 .mode = 0644, 4501 .proc_handler = proc_dointvec, 4502 }, 4503 #endif 4504 #endif 4505 { 4506 .procname = "proxy_ndp", 4507 .data = &ipv6_devconf.proxy_ndp, 4508 .maxlen = sizeof(int), 4509 .mode = 0644, 4510 .proc_handler = proc_dointvec, 4511 }, 4512 { 4513 .procname = "accept_source_route", 4514 .data = &ipv6_devconf.accept_source_route, 4515 .maxlen = sizeof(int), 4516 .mode = 0644, 4517 .proc_handler = proc_dointvec, 4518 }, 4519 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4520 { 4521 .procname = "optimistic_dad", 4522 .data = &ipv6_devconf.optimistic_dad, 4523 .maxlen = sizeof(int), 4524 .mode = 0644, 4525 .proc_handler = proc_dointvec, 4526 4527 }, 4528 #endif 4529 #ifdef CONFIG_IPV6_MROUTE 4530 { 4531 .procname = "mc_forwarding", 4532 .data = &ipv6_devconf.mc_forwarding, 4533 .maxlen = sizeof(int), 4534 .mode = 0444, 4535 .proc_handler = proc_dointvec, 4536 }, 4537 #endif 4538 { 4539 .procname = "disable_ipv6", 4540 .data = &ipv6_devconf.disable_ipv6, 4541 .maxlen = sizeof(int), 4542 .mode = 0644, 4543 .proc_handler = addrconf_sysctl_disable, 4544 }, 4545 { 4546 .procname = "accept_dad", 4547 .data = &ipv6_devconf.accept_dad, 4548 .maxlen = sizeof(int), 4549 .mode = 0644, 4550 .proc_handler = proc_dointvec, 4551 }, 4552 { 4553 .procname = "force_tllao", 4554 .data = &ipv6_devconf.force_tllao, 4555 .maxlen = sizeof(int), 4556 .mode = 0644, 4557 .proc_handler = proc_dointvec 4558 }, 4559 { 4560 /* sentinel */ 4561 } 4562 }, 4563 }; 4564 4565 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4566 struct inet6_dev *idev, struct ipv6_devconf *p) 4567 { 4568 int i; 4569 struct addrconf_sysctl_table *t; 4570 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4571 4572 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4573 if (t == NULL) 4574 goto out; 4575 4576 for (i = 0; t->addrconf_vars[i].data; i++) { 4577 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4578 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4579 t->addrconf_vars[i].extra2 = net; 4580 } 4581 4582 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4583 4584 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4585 if (t->sysctl_header == NULL) 4586 goto free; 4587 4588 p->sysctl = t; 4589 return 0; 4590 4591 free: 4592 kfree(t); 4593 out: 4594 return -ENOBUFS; 4595 } 4596 4597 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4598 { 4599 struct addrconf_sysctl_table *t; 4600 4601 if (p->sysctl == NULL) 4602 return; 4603 4604 t = p->sysctl; 4605 p->sysctl = NULL; 4606 unregister_net_sysctl_table(t->sysctl_header); 4607 kfree(t); 4608 } 4609 4610 static void addrconf_sysctl_register(struct inet6_dev *idev) 4611 { 4612 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4613 &ndisc_ifinfo_sysctl_change); 4614 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4615 idev, &idev->cnf); 4616 } 4617 4618 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4619 { 4620 __addrconf_sysctl_unregister(&idev->cnf); 4621 neigh_sysctl_unregister(idev->nd_parms); 4622 } 4623 4624 4625 #endif 4626 4627 static int __net_init addrconf_init_net(struct net *net) 4628 { 4629 int err; 4630 struct ipv6_devconf *all, *dflt; 4631 4632 err = -ENOMEM; 4633 all = &ipv6_devconf; 4634 dflt = &ipv6_devconf_dflt; 4635 4636 if (!net_eq(net, &init_net)) { 4637 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4638 if (all == NULL) 4639 goto err_alloc_all; 4640 4641 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4642 if (dflt == NULL) 4643 goto err_alloc_dflt; 4644 } else { 4645 /* these will be inherited by all namespaces */ 4646 dflt->autoconf = ipv6_defaults.autoconf; 4647 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4648 } 4649 4650 net->ipv6.devconf_all = all; 4651 net->ipv6.devconf_dflt = dflt; 4652 4653 #ifdef CONFIG_SYSCTL 4654 err = __addrconf_sysctl_register(net, "all", NULL, all); 4655 if (err < 0) 4656 goto err_reg_all; 4657 4658 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4659 if (err < 0) 4660 goto err_reg_dflt; 4661 #endif 4662 return 0; 4663 4664 #ifdef CONFIG_SYSCTL 4665 err_reg_dflt: 4666 __addrconf_sysctl_unregister(all); 4667 err_reg_all: 4668 kfree(dflt); 4669 #endif 4670 err_alloc_dflt: 4671 kfree(all); 4672 err_alloc_all: 4673 return err; 4674 } 4675 4676 static void __net_exit addrconf_exit_net(struct net *net) 4677 { 4678 #ifdef CONFIG_SYSCTL 4679 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4680 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4681 #endif 4682 if (!net_eq(net, &init_net)) { 4683 kfree(net->ipv6.devconf_dflt); 4684 kfree(net->ipv6.devconf_all); 4685 } 4686 } 4687 4688 static struct pernet_operations addrconf_ops = { 4689 .init = addrconf_init_net, 4690 .exit = addrconf_exit_net, 4691 }; 4692 4693 /* 4694 * Device notifier 4695 */ 4696 4697 int register_inet6addr_notifier(struct notifier_block *nb) 4698 { 4699 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4700 } 4701 EXPORT_SYMBOL(register_inet6addr_notifier); 4702 4703 int unregister_inet6addr_notifier(struct notifier_block *nb) 4704 { 4705 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4706 } 4707 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4708 4709 static struct rtnl_af_ops inet6_ops = { 4710 .family = AF_INET6, 4711 .fill_link_af = inet6_fill_link_af, 4712 .get_link_af_size = inet6_get_link_af_size, 4713 }; 4714 4715 /* 4716 * Init / cleanup code 4717 */ 4718 4719 int __init addrconf_init(void) 4720 { 4721 int i, err; 4722 4723 err = ipv6_addr_label_init(); 4724 if (err < 0) { 4725 pr_crit("%s: cannot initialize default policy table: %d\n", 4726 __func__, err); 4727 goto out; 4728 } 4729 4730 err = register_pernet_subsys(&addrconf_ops); 4731 if (err < 0) 4732 goto out_addrlabel; 4733 4734 /* The addrconf netdev notifier requires that loopback_dev 4735 * has it's ipv6 private information allocated and setup 4736 * before it can bring up and give link-local addresses 4737 * to other devices which are up. 4738 * 4739 * Unfortunately, loopback_dev is not necessarily the first 4740 * entry in the global dev_base list of net devices. In fact, 4741 * it is likely to be the very last entry on that list. 4742 * So this causes the notifier registry below to try and 4743 * give link-local addresses to all devices besides loopback_dev 4744 * first, then loopback_dev, which cases all the non-loopback_dev 4745 * devices to fail to get a link-local address. 4746 * 4747 * So, as a temporary fix, allocate the ipv6 structure for 4748 * loopback_dev first by hand. 4749 * Longer term, all of the dependencies ipv6 has upon the loopback 4750 * device and it being up should be removed. 4751 */ 4752 rtnl_lock(); 4753 if (!ipv6_add_dev(init_net.loopback_dev)) 4754 err = -ENOMEM; 4755 rtnl_unlock(); 4756 if (err) 4757 goto errlo; 4758 4759 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4760 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4761 4762 register_netdevice_notifier(&ipv6_dev_notf); 4763 4764 addrconf_verify(0); 4765 4766 err = rtnl_af_register(&inet6_ops); 4767 if (err < 0) 4768 goto errout_af; 4769 4770 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4771 NULL); 4772 if (err < 0) 4773 goto errout; 4774 4775 /* Only the first call to __rtnl_register can fail */ 4776 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4777 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4778 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4779 inet6_dump_ifaddr, NULL); 4780 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4781 inet6_dump_ifmcaddr, NULL); 4782 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4783 inet6_dump_ifacaddr, NULL); 4784 4785 ipv6_addr_label_rtnl_register(); 4786 4787 return 0; 4788 errout: 4789 rtnl_af_unregister(&inet6_ops); 4790 errout_af: 4791 unregister_netdevice_notifier(&ipv6_dev_notf); 4792 errlo: 4793 unregister_pernet_subsys(&addrconf_ops); 4794 out_addrlabel: 4795 ipv6_addr_label_cleanup(); 4796 out: 4797 return err; 4798 } 4799 4800 void addrconf_cleanup(void) 4801 { 4802 struct net_device *dev; 4803 int i; 4804 4805 unregister_netdevice_notifier(&ipv6_dev_notf); 4806 unregister_pernet_subsys(&addrconf_ops); 4807 ipv6_addr_label_cleanup(); 4808 4809 rtnl_lock(); 4810 4811 __rtnl_af_unregister(&inet6_ops); 4812 4813 /* clean dev list */ 4814 for_each_netdev(&init_net, dev) { 4815 if (__in6_dev_get(dev) == NULL) 4816 continue; 4817 addrconf_ifdown(dev, 1); 4818 } 4819 addrconf_ifdown(init_net.loopback_dev, 2); 4820 4821 /* 4822 * Check hash table. 4823 */ 4824 spin_lock_bh(&addrconf_hash_lock); 4825 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4826 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4827 spin_unlock_bh(&addrconf_hash_lock); 4828 4829 del_timer(&addr_chk_timer); 4830 rtnl_unlock(); 4831 } 4832