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 int __ipv6_regen_rndid(struct inet6_dev *idev); 131 static int __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 rcu_read_lock(); 498 for_each_netdev_rcu(net, dev) { 499 idev = __in6_dev_get(dev); 500 if (idev) { 501 int changed = (!idev->cnf.forwarding) ^ (!newf); 502 idev->cnf.forwarding = newf; 503 if (changed) 504 dev_forward_change(idev); 505 } 506 } 507 rcu_read_unlock(); 508 } 509 510 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 511 { 512 struct net *net; 513 int old; 514 515 if (!rtnl_trylock()) 516 return restart_syscall(); 517 518 net = (struct net *)table->extra2; 519 old = *p; 520 *p = newf; 521 522 if (p == &net->ipv6.devconf_dflt->forwarding) { 523 rtnl_unlock(); 524 return 0; 525 } 526 527 if (p == &net->ipv6.devconf_all->forwarding) { 528 net->ipv6.devconf_dflt->forwarding = newf; 529 addrconf_forward_change(net, newf); 530 } else if ((!newf) ^ (!old)) 531 dev_forward_change((struct inet6_dev *)table->extra1); 532 rtnl_unlock(); 533 534 if (newf) 535 rt6_purge_dflt_routers(net); 536 return 1; 537 } 538 #endif 539 540 /* Nobody refers to this ifaddr, destroy it */ 541 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 542 { 543 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 544 545 #ifdef NET_REFCNT_DEBUG 546 pr_debug("%s\n", __func__); 547 #endif 548 549 in6_dev_put(ifp->idev); 550 551 if (del_timer(&ifp->timer)) 552 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 553 554 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 555 pr_warn("Freeing alive inet6 address %p\n", ifp); 556 return; 557 } 558 dst_release(&ifp->rt->dst); 559 560 kfree_rcu(ifp, rcu); 561 } 562 563 static void 564 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 565 { 566 struct list_head *p; 567 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 568 569 /* 570 * Each device address list is sorted in order of scope - 571 * global before linklocal. 572 */ 573 list_for_each(p, &idev->addr_list) { 574 struct inet6_ifaddr *ifa 575 = list_entry(p, struct inet6_ifaddr, if_list); 576 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 577 break; 578 } 579 580 list_add_tail(&ifp->if_list, p); 581 } 582 583 static u32 inet6_addr_hash(const struct in6_addr *addr) 584 { 585 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 586 } 587 588 /* On success it returns ifp with increased reference count */ 589 590 static struct inet6_ifaddr * 591 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 592 int scope, u32 flags) 593 { 594 struct inet6_ifaddr *ifa = NULL; 595 struct rt6_info *rt; 596 unsigned int hash; 597 int err = 0; 598 int addr_type = ipv6_addr_type(addr); 599 600 if (addr_type == IPV6_ADDR_ANY || 601 addr_type & IPV6_ADDR_MULTICAST || 602 (!(idev->dev->flags & IFF_LOOPBACK) && 603 addr_type & IPV6_ADDR_LOOPBACK)) 604 return ERR_PTR(-EADDRNOTAVAIL); 605 606 rcu_read_lock_bh(); 607 if (idev->dead) { 608 err = -ENODEV; /*XXX*/ 609 goto out2; 610 } 611 612 if (idev->cnf.disable_ipv6) { 613 err = -EACCES; 614 goto out2; 615 } 616 617 spin_lock(&addrconf_hash_lock); 618 619 /* Ignore adding duplicate addresses on an interface */ 620 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 621 ADBG(("ipv6_add_addr: already assigned\n")); 622 err = -EEXIST; 623 goto out; 624 } 625 626 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 627 628 if (ifa == NULL) { 629 ADBG(("ipv6_add_addr: malloc failed\n")); 630 err = -ENOBUFS; 631 goto out; 632 } 633 634 rt = addrconf_dst_alloc(idev, addr, false); 635 if (IS_ERR(rt)) { 636 err = PTR_ERR(rt); 637 goto out; 638 } 639 640 ifa->addr = *addr; 641 642 spin_lock_init(&ifa->lock); 643 spin_lock_init(&ifa->state_lock); 644 init_timer(&ifa->timer); 645 INIT_HLIST_NODE(&ifa->addr_lst); 646 ifa->timer.data = (unsigned long) ifa; 647 ifa->scope = scope; 648 ifa->prefix_len = pfxlen; 649 ifa->flags = flags | IFA_F_TENTATIVE; 650 ifa->cstamp = ifa->tstamp = jiffies; 651 652 ifa->rt = rt; 653 654 ifa->idev = idev; 655 in6_dev_hold(idev); 656 /* For caller */ 657 in6_ifa_hold(ifa); 658 659 /* Add to big hash table */ 660 hash = inet6_addr_hash(addr); 661 662 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 663 spin_unlock(&addrconf_hash_lock); 664 665 write_lock(&idev->lock); 666 /* Add to inet6_dev unicast addr list. */ 667 ipv6_link_dev_addr(idev, ifa); 668 669 #ifdef CONFIG_IPV6_PRIVACY 670 if (ifa->flags&IFA_F_TEMPORARY) { 671 list_add(&ifa->tmp_list, &idev->tempaddr_list); 672 in6_ifa_hold(ifa); 673 } 674 #endif 675 676 in6_ifa_hold(ifa); 677 write_unlock(&idev->lock); 678 out2: 679 rcu_read_unlock_bh(); 680 681 if (likely(err == 0)) 682 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 683 else { 684 kfree(ifa); 685 ifa = ERR_PTR(err); 686 } 687 688 return ifa; 689 out: 690 spin_unlock(&addrconf_hash_lock); 691 goto out2; 692 } 693 694 /* This function wants to get referenced ifp and releases it before return */ 695 696 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 697 { 698 struct inet6_ifaddr *ifa, *ifn; 699 struct inet6_dev *idev = ifp->idev; 700 int state; 701 int deleted = 0, onlink = 0; 702 unsigned long expires = jiffies; 703 704 spin_lock_bh(&ifp->state_lock); 705 state = ifp->state; 706 ifp->state = INET6_IFADDR_STATE_DEAD; 707 spin_unlock_bh(&ifp->state_lock); 708 709 if (state == INET6_IFADDR_STATE_DEAD) 710 goto out; 711 712 spin_lock_bh(&addrconf_hash_lock); 713 hlist_del_init_rcu(&ifp->addr_lst); 714 spin_unlock_bh(&addrconf_hash_lock); 715 716 write_lock_bh(&idev->lock); 717 #ifdef CONFIG_IPV6_PRIVACY 718 if (ifp->flags&IFA_F_TEMPORARY) { 719 list_del(&ifp->tmp_list); 720 if (ifp->ifpub) { 721 in6_ifa_put(ifp->ifpub); 722 ifp->ifpub = NULL; 723 } 724 __in6_ifa_put(ifp); 725 } 726 #endif 727 728 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 729 if (ifa == ifp) { 730 list_del_init(&ifp->if_list); 731 __in6_ifa_put(ifp); 732 733 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 734 break; 735 deleted = 1; 736 continue; 737 } else if (ifp->flags & IFA_F_PERMANENT) { 738 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 739 ifp->prefix_len)) { 740 if (ifa->flags & IFA_F_PERMANENT) { 741 onlink = 1; 742 if (deleted) 743 break; 744 } else { 745 unsigned long lifetime; 746 747 if (!onlink) 748 onlink = -1; 749 750 spin_lock(&ifa->lock); 751 752 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 753 /* 754 * Note: Because this address is 755 * not permanent, lifetime < 756 * LONG_MAX / HZ here. 757 */ 758 if (time_before(expires, 759 ifa->tstamp + lifetime * HZ)) 760 expires = ifa->tstamp + lifetime * HZ; 761 spin_unlock(&ifa->lock); 762 } 763 } 764 } 765 } 766 write_unlock_bh(&idev->lock); 767 768 addrconf_del_timer(ifp); 769 770 ipv6_ifa_notify(RTM_DELADDR, ifp); 771 772 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 773 774 /* 775 * Purge or update corresponding prefix 776 * 777 * 1) we don't purge prefix here if address was not permanent. 778 * prefix is managed by its own lifetime. 779 * 2) if there're no addresses, delete prefix. 780 * 3) if there're still other permanent address(es), 781 * corresponding prefix is still permanent. 782 * 4) otherwise, update prefix lifetime to the 783 * longest valid lifetime among the corresponding 784 * addresses on the device. 785 * Note: subsequent RA will update lifetime. 786 * 787 * --yoshfuji 788 */ 789 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 790 struct in6_addr prefix; 791 struct rt6_info *rt; 792 struct net *net = dev_net(ifp->idev->dev); 793 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 794 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 795 796 if (rt && addrconf_is_prefix_route(rt)) { 797 if (onlink == 0) { 798 ip6_del_rt(rt); 799 rt = NULL; 800 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 801 rt6_set_expires(rt, expires); 802 } 803 } 804 dst_release(&rt->dst); 805 } 806 807 /* clean up prefsrc entries */ 808 rt6_remove_prefsrc(ifp); 809 out: 810 in6_ifa_put(ifp); 811 } 812 813 #ifdef CONFIG_IPV6_PRIVACY 814 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 815 { 816 struct inet6_dev *idev = ifp->idev; 817 struct in6_addr addr, *tmpaddr; 818 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 819 unsigned long regen_advance; 820 int tmp_plen; 821 int ret = 0; 822 int max_addresses; 823 u32 addr_flags; 824 unsigned long now = jiffies; 825 826 write_lock(&idev->lock); 827 if (ift) { 828 spin_lock_bh(&ift->lock); 829 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 830 spin_unlock_bh(&ift->lock); 831 tmpaddr = &addr; 832 } else { 833 tmpaddr = NULL; 834 } 835 retry: 836 in6_dev_hold(idev); 837 if (idev->cnf.use_tempaddr <= 0) { 838 write_unlock(&idev->lock); 839 pr_info("%s: use_tempaddr is disabled\n", __func__); 840 in6_dev_put(idev); 841 ret = -1; 842 goto out; 843 } 844 spin_lock_bh(&ifp->lock); 845 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 846 idev->cnf.use_tempaddr = -1; /*XXX*/ 847 spin_unlock_bh(&ifp->lock); 848 write_unlock(&idev->lock); 849 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 850 __func__); 851 in6_dev_put(idev); 852 ret = -1; 853 goto out; 854 } 855 in6_ifa_hold(ifp); 856 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 857 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 858 spin_unlock_bh(&ifp->lock); 859 write_unlock(&idev->lock); 860 pr_warn("%s: regeneration of randomized interface id failed\n", 861 __func__); 862 in6_ifa_put(ifp); 863 in6_dev_put(idev); 864 ret = -1; 865 goto out; 866 } 867 memcpy(&addr.s6_addr[8], idev->rndid, 8); 868 age = (now - ifp->tstamp) / HZ; 869 tmp_valid_lft = min_t(__u32, 870 ifp->valid_lft, 871 idev->cnf.temp_valid_lft + age); 872 tmp_prefered_lft = min_t(__u32, 873 ifp->prefered_lft, 874 idev->cnf.temp_prefered_lft + age - 875 idev->cnf.max_desync_factor); 876 tmp_plen = ifp->prefix_len; 877 max_addresses = idev->cnf.max_addresses; 878 tmp_tstamp = ifp->tstamp; 879 spin_unlock_bh(&ifp->lock); 880 881 regen_advance = idev->cnf.regen_max_retry * 882 idev->cnf.dad_transmits * 883 idev->nd_parms->retrans_time / HZ; 884 write_unlock(&idev->lock); 885 886 /* A temporary address is created only if this calculated Preferred 887 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 888 * an implementation must not create a temporary address with a zero 889 * Preferred Lifetime. 890 */ 891 if (tmp_prefered_lft <= regen_advance) { 892 in6_ifa_put(ifp); 893 in6_dev_put(idev); 894 ret = -1; 895 goto out; 896 } 897 898 addr_flags = IFA_F_TEMPORARY; 899 /* set in addrconf_prefix_rcv() */ 900 if (ifp->flags & IFA_F_OPTIMISTIC) 901 addr_flags |= IFA_F_OPTIMISTIC; 902 903 ift = !max_addresses || 904 ipv6_count_addresses(idev) < max_addresses ? 905 ipv6_add_addr(idev, &addr, tmp_plen, 906 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 907 addr_flags) : NULL; 908 if (!ift || IS_ERR(ift)) { 909 in6_ifa_put(ifp); 910 in6_dev_put(idev); 911 pr_info("%s: retry temporary address regeneration\n", __func__); 912 tmpaddr = &addr; 913 write_lock(&idev->lock); 914 goto retry; 915 } 916 917 spin_lock_bh(&ift->lock); 918 ift->ifpub = ifp; 919 ift->valid_lft = tmp_valid_lft; 920 ift->prefered_lft = tmp_prefered_lft; 921 ift->cstamp = now; 922 ift->tstamp = tmp_tstamp; 923 spin_unlock_bh(&ift->lock); 924 925 addrconf_dad_start(ift); 926 in6_ifa_put(ift); 927 in6_dev_put(idev); 928 out: 929 return ret; 930 } 931 #endif 932 933 /* 934 * Choose an appropriate source address (RFC3484) 935 */ 936 enum { 937 IPV6_SADDR_RULE_INIT = 0, 938 IPV6_SADDR_RULE_LOCAL, 939 IPV6_SADDR_RULE_SCOPE, 940 IPV6_SADDR_RULE_PREFERRED, 941 #ifdef CONFIG_IPV6_MIP6 942 IPV6_SADDR_RULE_HOA, 943 #endif 944 IPV6_SADDR_RULE_OIF, 945 IPV6_SADDR_RULE_LABEL, 946 #ifdef CONFIG_IPV6_PRIVACY 947 IPV6_SADDR_RULE_PRIVACY, 948 #endif 949 IPV6_SADDR_RULE_ORCHID, 950 IPV6_SADDR_RULE_PREFIX, 951 IPV6_SADDR_RULE_MAX 952 }; 953 954 struct ipv6_saddr_score { 955 int rule; 956 int addr_type; 957 struct inet6_ifaddr *ifa; 958 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 959 int scopedist; 960 int matchlen; 961 }; 962 963 struct ipv6_saddr_dst { 964 const struct in6_addr *addr; 965 int ifindex; 966 int scope; 967 int label; 968 unsigned int prefs; 969 }; 970 971 static inline int ipv6_saddr_preferred(int type) 972 { 973 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 974 return 1; 975 return 0; 976 } 977 978 static int ipv6_get_saddr_eval(struct net *net, 979 struct ipv6_saddr_score *score, 980 struct ipv6_saddr_dst *dst, 981 int i) 982 { 983 int ret; 984 985 if (i <= score->rule) { 986 switch (i) { 987 case IPV6_SADDR_RULE_SCOPE: 988 ret = score->scopedist; 989 break; 990 case IPV6_SADDR_RULE_PREFIX: 991 ret = score->matchlen; 992 break; 993 default: 994 ret = !!test_bit(i, score->scorebits); 995 } 996 goto out; 997 } 998 999 switch (i) { 1000 case IPV6_SADDR_RULE_INIT: 1001 /* Rule 0: remember if hiscore is not ready yet */ 1002 ret = !!score->ifa; 1003 break; 1004 case IPV6_SADDR_RULE_LOCAL: 1005 /* Rule 1: Prefer same address */ 1006 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1007 break; 1008 case IPV6_SADDR_RULE_SCOPE: 1009 /* Rule 2: Prefer appropriate scope 1010 * 1011 * ret 1012 * ^ 1013 * -1 | d 15 1014 * ---+--+-+---> scope 1015 * | 1016 * | d is scope of the destination. 1017 * B-d | \ 1018 * | \ <- smaller scope is better if 1019 * B-15 | \ if scope is enough for destinaion. 1020 * | ret = B - scope (-1 <= scope >= d <= 15). 1021 * d-C-1 | / 1022 * |/ <- greater is better 1023 * -C / if scope is not enough for destination. 1024 * /| ret = scope - C (-1 <= d < scope <= 15). 1025 * 1026 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1027 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1028 * Assume B = 0 and we get C > 29. 1029 */ 1030 ret = __ipv6_addr_src_scope(score->addr_type); 1031 if (ret >= dst->scope) 1032 ret = -ret; 1033 else 1034 ret -= 128; /* 30 is enough */ 1035 score->scopedist = ret; 1036 break; 1037 case IPV6_SADDR_RULE_PREFERRED: 1038 /* Rule 3: Avoid deprecated and optimistic addresses */ 1039 ret = ipv6_saddr_preferred(score->addr_type) || 1040 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1041 break; 1042 #ifdef CONFIG_IPV6_MIP6 1043 case IPV6_SADDR_RULE_HOA: 1044 { 1045 /* Rule 4: Prefer home address */ 1046 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1047 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1048 break; 1049 } 1050 #endif 1051 case IPV6_SADDR_RULE_OIF: 1052 /* Rule 5: Prefer outgoing interface */ 1053 ret = (!dst->ifindex || 1054 dst->ifindex == score->ifa->idev->dev->ifindex); 1055 break; 1056 case IPV6_SADDR_RULE_LABEL: 1057 /* Rule 6: Prefer matching label */ 1058 ret = ipv6_addr_label(net, 1059 &score->ifa->addr, score->addr_type, 1060 score->ifa->idev->dev->ifindex) == dst->label; 1061 break; 1062 #ifdef CONFIG_IPV6_PRIVACY 1063 case IPV6_SADDR_RULE_PRIVACY: 1064 { 1065 /* Rule 7: Prefer public address 1066 * Note: prefer temporary address if use_tempaddr >= 2 1067 */ 1068 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1069 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1070 score->ifa->idev->cnf.use_tempaddr >= 2; 1071 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1072 break; 1073 } 1074 #endif 1075 case IPV6_SADDR_RULE_ORCHID: 1076 /* Rule 8-: Prefer ORCHID vs ORCHID or 1077 * non-ORCHID vs non-ORCHID 1078 */ 1079 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1080 ipv6_addr_orchid(dst->addr)); 1081 break; 1082 case IPV6_SADDR_RULE_PREFIX: 1083 /* Rule 8: Use longest matching prefix */ 1084 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1085 dst->addr); 1086 break; 1087 default: 1088 ret = 0; 1089 } 1090 1091 if (ret) 1092 __set_bit(i, score->scorebits); 1093 score->rule = i; 1094 out: 1095 return ret; 1096 } 1097 1098 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1099 const struct in6_addr *daddr, unsigned int prefs, 1100 struct in6_addr *saddr) 1101 { 1102 struct ipv6_saddr_score scores[2], 1103 *score = &scores[0], *hiscore = &scores[1]; 1104 struct ipv6_saddr_dst dst; 1105 struct net_device *dev; 1106 int dst_type; 1107 1108 dst_type = __ipv6_addr_type(daddr); 1109 dst.addr = daddr; 1110 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1111 dst.scope = __ipv6_addr_src_scope(dst_type); 1112 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1113 dst.prefs = prefs; 1114 1115 hiscore->rule = -1; 1116 hiscore->ifa = NULL; 1117 1118 rcu_read_lock(); 1119 1120 for_each_netdev_rcu(net, dev) { 1121 struct inet6_dev *idev; 1122 1123 /* Candidate Source Address (section 4) 1124 * - multicast and link-local destination address, 1125 * the set of candidate source address MUST only 1126 * include addresses assigned to interfaces 1127 * belonging to the same link as the outgoing 1128 * interface. 1129 * (- For site-local destination addresses, the 1130 * set of candidate source addresses MUST only 1131 * include addresses assigned to interfaces 1132 * belonging to the same site as the outgoing 1133 * interface.) 1134 */ 1135 if (((dst_type & IPV6_ADDR_MULTICAST) || 1136 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1137 dst.ifindex && dev->ifindex != dst.ifindex) 1138 continue; 1139 1140 idev = __in6_dev_get(dev); 1141 if (!idev) 1142 continue; 1143 1144 read_lock_bh(&idev->lock); 1145 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1146 int i; 1147 1148 /* 1149 * - Tentative Address (RFC2462 section 5.4) 1150 * - A tentative address is not considered 1151 * "assigned to an interface" in the traditional 1152 * sense, unless it is also flagged as optimistic. 1153 * - Candidate Source Address (section 4) 1154 * - In any case, anycast addresses, multicast 1155 * addresses, and the unspecified address MUST 1156 * NOT be included in a candidate set. 1157 */ 1158 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1159 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1160 continue; 1161 1162 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1163 1164 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1165 score->addr_type & IPV6_ADDR_MULTICAST)) { 1166 LIMIT_NETDEBUG(KERN_DEBUG 1167 "ADDRCONF: unspecified / multicast address " 1168 "assigned as unicast address on %s", 1169 dev->name); 1170 continue; 1171 } 1172 1173 score->rule = -1; 1174 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1175 1176 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1177 int minihiscore, miniscore; 1178 1179 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1180 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1181 1182 if (minihiscore > miniscore) { 1183 if (i == IPV6_SADDR_RULE_SCOPE && 1184 score->scopedist > 0) { 1185 /* 1186 * special case: 1187 * each remaining entry 1188 * has too small (not enough) 1189 * scope, because ifa entries 1190 * are sorted by their scope 1191 * values. 1192 */ 1193 goto try_nextdev; 1194 } 1195 break; 1196 } else if (minihiscore < miniscore) { 1197 if (hiscore->ifa) 1198 in6_ifa_put(hiscore->ifa); 1199 1200 in6_ifa_hold(score->ifa); 1201 1202 swap(hiscore, score); 1203 1204 /* restore our iterator */ 1205 score->ifa = hiscore->ifa; 1206 1207 break; 1208 } 1209 } 1210 } 1211 try_nextdev: 1212 read_unlock_bh(&idev->lock); 1213 } 1214 rcu_read_unlock(); 1215 1216 if (!hiscore->ifa) 1217 return -EADDRNOTAVAIL; 1218 1219 *saddr = hiscore->ifa->addr; 1220 in6_ifa_put(hiscore->ifa); 1221 return 0; 1222 } 1223 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1224 1225 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1226 unsigned char banned_flags) 1227 { 1228 struct inet6_dev *idev; 1229 int err = -EADDRNOTAVAIL; 1230 1231 rcu_read_lock(); 1232 idev = __in6_dev_get(dev); 1233 if (idev) { 1234 struct inet6_ifaddr *ifp; 1235 1236 read_lock_bh(&idev->lock); 1237 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1238 if (ifp->scope == IFA_LINK && 1239 !(ifp->flags & banned_flags)) { 1240 *addr = ifp->addr; 1241 err = 0; 1242 break; 1243 } 1244 } 1245 read_unlock_bh(&idev->lock); 1246 } 1247 rcu_read_unlock(); 1248 return err; 1249 } 1250 1251 static int ipv6_count_addresses(struct inet6_dev *idev) 1252 { 1253 int cnt = 0; 1254 struct inet6_ifaddr *ifp; 1255 1256 read_lock_bh(&idev->lock); 1257 list_for_each_entry(ifp, &idev->addr_list, if_list) 1258 cnt++; 1259 read_unlock_bh(&idev->lock); 1260 return cnt; 1261 } 1262 1263 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1264 struct net_device *dev, int strict) 1265 { 1266 struct inet6_ifaddr *ifp; 1267 struct hlist_node *node; 1268 unsigned int hash = inet6_addr_hash(addr); 1269 1270 rcu_read_lock_bh(); 1271 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1272 if (!net_eq(dev_net(ifp->idev->dev), net)) 1273 continue; 1274 if (ipv6_addr_equal(&ifp->addr, addr) && 1275 !(ifp->flags&IFA_F_TENTATIVE) && 1276 (dev == NULL || ifp->idev->dev == dev || 1277 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1278 rcu_read_unlock_bh(); 1279 return 1; 1280 } 1281 } 1282 1283 rcu_read_unlock_bh(); 1284 return 0; 1285 } 1286 EXPORT_SYMBOL(ipv6_chk_addr); 1287 1288 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1289 struct net_device *dev) 1290 { 1291 unsigned int hash = inet6_addr_hash(addr); 1292 struct inet6_ifaddr *ifp; 1293 struct hlist_node *node; 1294 1295 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1296 if (!net_eq(dev_net(ifp->idev->dev), net)) 1297 continue; 1298 if (ipv6_addr_equal(&ifp->addr, addr)) { 1299 if (dev == NULL || ifp->idev->dev == dev) 1300 return true; 1301 } 1302 } 1303 return false; 1304 } 1305 1306 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1307 { 1308 struct inet6_dev *idev; 1309 struct inet6_ifaddr *ifa; 1310 int onlink; 1311 1312 onlink = 0; 1313 rcu_read_lock(); 1314 idev = __in6_dev_get(dev); 1315 if (idev) { 1316 read_lock_bh(&idev->lock); 1317 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1318 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1319 ifa->prefix_len); 1320 if (onlink) 1321 break; 1322 } 1323 read_unlock_bh(&idev->lock); 1324 } 1325 rcu_read_unlock(); 1326 return onlink; 1327 } 1328 EXPORT_SYMBOL(ipv6_chk_prefix); 1329 1330 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1331 struct net_device *dev, int strict) 1332 { 1333 struct inet6_ifaddr *ifp, *result = NULL; 1334 unsigned int hash = inet6_addr_hash(addr); 1335 struct hlist_node *node; 1336 1337 rcu_read_lock_bh(); 1338 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1339 if (!net_eq(dev_net(ifp->idev->dev), net)) 1340 continue; 1341 if (ipv6_addr_equal(&ifp->addr, addr)) { 1342 if (dev == NULL || ifp->idev->dev == dev || 1343 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1344 result = ifp; 1345 in6_ifa_hold(ifp); 1346 break; 1347 } 1348 } 1349 } 1350 rcu_read_unlock_bh(); 1351 1352 return result; 1353 } 1354 1355 /* Gets referenced address, destroys ifaddr */ 1356 1357 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1358 { 1359 if (ifp->flags&IFA_F_PERMANENT) { 1360 spin_lock_bh(&ifp->lock); 1361 addrconf_del_timer(ifp); 1362 ifp->flags |= IFA_F_TENTATIVE; 1363 if (dad_failed) 1364 ifp->flags |= IFA_F_DADFAILED; 1365 spin_unlock_bh(&ifp->lock); 1366 if (dad_failed) 1367 ipv6_ifa_notify(0, ifp); 1368 in6_ifa_put(ifp); 1369 #ifdef CONFIG_IPV6_PRIVACY 1370 } else if (ifp->flags&IFA_F_TEMPORARY) { 1371 struct inet6_ifaddr *ifpub; 1372 spin_lock_bh(&ifp->lock); 1373 ifpub = ifp->ifpub; 1374 if (ifpub) { 1375 in6_ifa_hold(ifpub); 1376 spin_unlock_bh(&ifp->lock); 1377 ipv6_create_tempaddr(ifpub, ifp); 1378 in6_ifa_put(ifpub); 1379 } else { 1380 spin_unlock_bh(&ifp->lock); 1381 } 1382 ipv6_del_addr(ifp); 1383 #endif 1384 } else 1385 ipv6_del_addr(ifp); 1386 } 1387 1388 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1389 { 1390 int err = -ENOENT; 1391 1392 spin_lock(&ifp->state_lock); 1393 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1394 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1395 err = 0; 1396 } 1397 spin_unlock(&ifp->state_lock); 1398 1399 return err; 1400 } 1401 1402 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1403 { 1404 struct inet6_dev *idev = ifp->idev; 1405 1406 if (addrconf_dad_end(ifp)) { 1407 in6_ifa_put(ifp); 1408 return; 1409 } 1410 1411 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1412 ifp->idev->dev->name, &ifp->addr); 1413 1414 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1415 struct in6_addr addr; 1416 1417 addr.s6_addr32[0] = htonl(0xfe800000); 1418 addr.s6_addr32[1] = 0; 1419 1420 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1421 ipv6_addr_equal(&ifp->addr, &addr)) { 1422 /* DAD failed for link-local based on MAC address */ 1423 idev->cnf.disable_ipv6 = 1; 1424 1425 pr_info("%s: IPv6 being disabled!\n", 1426 ifp->idev->dev->name); 1427 } 1428 } 1429 1430 addrconf_dad_stop(ifp, 1); 1431 } 1432 1433 /* Join to solicited addr multicast group. */ 1434 1435 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1436 { 1437 struct in6_addr maddr; 1438 1439 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1440 return; 1441 1442 addrconf_addr_solict_mult(addr, &maddr); 1443 ipv6_dev_mc_inc(dev, &maddr); 1444 } 1445 1446 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1447 { 1448 struct in6_addr maddr; 1449 1450 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1451 return; 1452 1453 addrconf_addr_solict_mult(addr, &maddr); 1454 __ipv6_dev_mc_dec(idev, &maddr); 1455 } 1456 1457 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1458 { 1459 struct in6_addr addr; 1460 if (ifp->prefix_len == 127) /* RFC 6164 */ 1461 return; 1462 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1463 if (ipv6_addr_any(&addr)) 1464 return; 1465 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1466 } 1467 1468 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1469 { 1470 struct in6_addr addr; 1471 if (ifp->prefix_len == 127) /* RFC 6164 */ 1472 return; 1473 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1474 if (ipv6_addr_any(&addr)) 1475 return; 1476 __ipv6_dev_ac_dec(ifp->idev, &addr); 1477 } 1478 1479 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1480 { 1481 if (dev->addr_len != ETH_ALEN) 1482 return -1; 1483 memcpy(eui, dev->dev_addr, 3); 1484 memcpy(eui + 5, dev->dev_addr + 3, 3); 1485 1486 /* 1487 * The zSeries OSA network cards can be shared among various 1488 * OS instances, but the OSA cards have only one MAC address. 1489 * This leads to duplicate address conflicts in conjunction 1490 * with IPv6 if more than one instance uses the same card. 1491 * 1492 * The driver for these cards can deliver a unique 16-bit 1493 * identifier for each instance sharing the same card. It is 1494 * placed instead of 0xFFFE in the interface identifier. The 1495 * "u" bit of the interface identifier is not inverted in this 1496 * case. Hence the resulting interface identifier has local 1497 * scope according to RFC2373. 1498 */ 1499 if (dev->dev_id) { 1500 eui[3] = (dev->dev_id >> 8) & 0xFF; 1501 eui[4] = dev->dev_id & 0xFF; 1502 } else { 1503 eui[3] = 0xFF; 1504 eui[4] = 0xFE; 1505 eui[0] ^= 2; 1506 } 1507 return 0; 1508 } 1509 1510 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1511 { 1512 if (dev->addr_len != IEEE802154_ADDR_LEN) 1513 return -1; 1514 memcpy(eui, dev->dev_addr, 8); 1515 return 0; 1516 } 1517 1518 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1519 { 1520 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1521 if (dev->addr_len != ARCNET_ALEN) 1522 return -1; 1523 memset(eui, 0, 7); 1524 eui[7] = *(u8 *)dev->dev_addr; 1525 return 0; 1526 } 1527 1528 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1529 { 1530 if (dev->addr_len != INFINIBAND_ALEN) 1531 return -1; 1532 memcpy(eui, dev->dev_addr + 12, 8); 1533 eui[0] |= 2; 1534 return 0; 1535 } 1536 1537 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1538 { 1539 if (addr == 0) 1540 return -1; 1541 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1542 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1543 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1544 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1545 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1546 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1547 eui[1] = 0; 1548 eui[2] = 0x5E; 1549 eui[3] = 0xFE; 1550 memcpy(eui + 4, &addr, 4); 1551 return 0; 1552 } 1553 1554 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1555 { 1556 if (dev->priv_flags & IFF_ISATAP) 1557 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1558 return -1; 1559 } 1560 1561 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1562 { 1563 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1564 } 1565 1566 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1567 { 1568 switch (dev->type) { 1569 case ARPHRD_ETHER: 1570 case ARPHRD_FDDI: 1571 return addrconf_ifid_eui48(eui, dev); 1572 case ARPHRD_ARCNET: 1573 return addrconf_ifid_arcnet(eui, dev); 1574 case ARPHRD_INFINIBAND: 1575 return addrconf_ifid_infiniband(eui, dev); 1576 case ARPHRD_SIT: 1577 return addrconf_ifid_sit(eui, dev); 1578 case ARPHRD_IPGRE: 1579 return addrconf_ifid_gre(eui, dev); 1580 case ARPHRD_IEEE802154: 1581 return addrconf_ifid_eui64(eui, dev); 1582 } 1583 return -1; 1584 } 1585 1586 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1587 { 1588 int err = -1; 1589 struct inet6_ifaddr *ifp; 1590 1591 read_lock_bh(&idev->lock); 1592 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1593 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1594 memcpy(eui, ifp->addr.s6_addr+8, 8); 1595 err = 0; 1596 break; 1597 } 1598 } 1599 read_unlock_bh(&idev->lock); 1600 return err; 1601 } 1602 1603 #ifdef CONFIG_IPV6_PRIVACY 1604 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1605 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1606 { 1607 regen: 1608 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1609 idev->rndid[0] &= ~0x02; 1610 1611 /* 1612 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1613 * check if generated address is not inappropriate 1614 * 1615 * - Reserved subnet anycast (RFC 2526) 1616 * 11111101 11....11 1xxxxxxx 1617 * - ISATAP (RFC4214) 6.1 1618 * 00-00-5E-FE-xx-xx-xx-xx 1619 * - value 0 1620 * - XXX: already assigned to an address on the device 1621 */ 1622 if (idev->rndid[0] == 0xfd && 1623 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1624 (idev->rndid[7]&0x80)) 1625 goto regen; 1626 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1627 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1628 goto regen; 1629 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1630 goto regen; 1631 } 1632 1633 return 0; 1634 } 1635 1636 static void ipv6_regen_rndid(unsigned long data) 1637 { 1638 struct inet6_dev *idev = (struct inet6_dev *) data; 1639 unsigned long expires; 1640 1641 rcu_read_lock_bh(); 1642 write_lock_bh(&idev->lock); 1643 1644 if (idev->dead) 1645 goto out; 1646 1647 if (__ipv6_regen_rndid(idev) < 0) 1648 goto out; 1649 1650 expires = jiffies + 1651 idev->cnf.temp_prefered_lft * HZ - 1652 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1653 idev->cnf.max_desync_factor * HZ; 1654 if (time_before(expires, jiffies)) { 1655 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1656 __func__, idev->dev->name); 1657 goto out; 1658 } 1659 1660 if (!mod_timer(&idev->regen_timer, expires)) 1661 in6_dev_hold(idev); 1662 1663 out: 1664 write_unlock_bh(&idev->lock); 1665 rcu_read_unlock_bh(); 1666 in6_dev_put(idev); 1667 } 1668 1669 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1670 { 1671 int ret = 0; 1672 1673 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1674 ret = __ipv6_regen_rndid(idev); 1675 return ret; 1676 } 1677 #endif 1678 1679 /* 1680 * Add prefix route. 1681 */ 1682 1683 static void 1684 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1685 unsigned long expires, u32 flags) 1686 { 1687 struct fib6_config cfg = { 1688 .fc_table = RT6_TABLE_PREFIX, 1689 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1690 .fc_ifindex = dev->ifindex, 1691 .fc_expires = expires, 1692 .fc_dst_len = plen, 1693 .fc_flags = RTF_UP | flags, 1694 .fc_nlinfo.nl_net = dev_net(dev), 1695 .fc_protocol = RTPROT_KERNEL, 1696 }; 1697 1698 cfg.fc_dst = *pfx; 1699 1700 /* Prevent useless cloning on PtP SIT. 1701 This thing is done here expecting that the whole 1702 class of non-broadcast devices need not cloning. 1703 */ 1704 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1705 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1706 cfg.fc_flags |= RTF_NONEXTHOP; 1707 #endif 1708 1709 ip6_route_add(&cfg); 1710 } 1711 1712 1713 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1714 int plen, 1715 const struct net_device *dev, 1716 u32 flags, u32 noflags) 1717 { 1718 struct fib6_node *fn; 1719 struct rt6_info *rt = NULL; 1720 struct fib6_table *table; 1721 1722 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1723 if (table == NULL) 1724 return NULL; 1725 1726 write_lock_bh(&table->tb6_lock); 1727 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1728 if (!fn) 1729 goto out; 1730 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1731 if (rt->dst.dev->ifindex != dev->ifindex) 1732 continue; 1733 if ((rt->rt6i_flags & flags) != flags) 1734 continue; 1735 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0)) 1736 continue; 1737 dst_hold(&rt->dst); 1738 break; 1739 } 1740 out: 1741 write_unlock_bh(&table->tb6_lock); 1742 return rt; 1743 } 1744 1745 1746 /* Create "default" multicast route to the interface */ 1747 1748 static void addrconf_add_mroute(struct net_device *dev) 1749 { 1750 struct fib6_config cfg = { 1751 .fc_table = RT6_TABLE_LOCAL, 1752 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1753 .fc_ifindex = dev->ifindex, 1754 .fc_dst_len = 8, 1755 .fc_flags = RTF_UP, 1756 .fc_nlinfo.nl_net = dev_net(dev), 1757 }; 1758 1759 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1760 1761 ip6_route_add(&cfg); 1762 } 1763 1764 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1765 static void sit_route_add(struct net_device *dev) 1766 { 1767 struct fib6_config cfg = { 1768 .fc_table = RT6_TABLE_MAIN, 1769 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1770 .fc_ifindex = dev->ifindex, 1771 .fc_dst_len = 96, 1772 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1773 .fc_nlinfo.nl_net = dev_net(dev), 1774 }; 1775 1776 /* prefix length - 96 bits "::d.d.d.d" */ 1777 ip6_route_add(&cfg); 1778 } 1779 #endif 1780 1781 static void addrconf_add_lroute(struct net_device *dev) 1782 { 1783 struct in6_addr addr; 1784 1785 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1786 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1787 } 1788 1789 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1790 { 1791 struct inet6_dev *idev; 1792 1793 ASSERT_RTNL(); 1794 1795 idev = ipv6_find_idev(dev); 1796 if (!idev) 1797 return ERR_PTR(-ENOBUFS); 1798 1799 if (idev->cnf.disable_ipv6) 1800 return ERR_PTR(-EACCES); 1801 1802 /* Add default multicast route */ 1803 if (!(dev->flags & IFF_LOOPBACK)) 1804 addrconf_add_mroute(dev); 1805 1806 /* Add link local route */ 1807 addrconf_add_lroute(dev); 1808 return idev; 1809 } 1810 1811 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 1812 { 1813 struct prefix_info *pinfo; 1814 __u32 valid_lft; 1815 __u32 prefered_lft; 1816 int addr_type; 1817 struct inet6_dev *in6_dev; 1818 struct net *net = dev_net(dev); 1819 1820 pinfo = (struct prefix_info *) opt; 1821 1822 if (len < sizeof(struct prefix_info)) { 1823 ADBG(("addrconf: prefix option too short\n")); 1824 return; 1825 } 1826 1827 /* 1828 * Validation checks ([ADDRCONF], page 19) 1829 */ 1830 1831 addr_type = ipv6_addr_type(&pinfo->prefix); 1832 1833 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1834 return; 1835 1836 valid_lft = ntohl(pinfo->valid); 1837 prefered_lft = ntohl(pinfo->prefered); 1838 1839 if (prefered_lft > valid_lft) { 1840 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 1841 return; 1842 } 1843 1844 in6_dev = in6_dev_get(dev); 1845 1846 if (in6_dev == NULL) { 1847 net_dbg_ratelimited("addrconf: device %s not configured\n", 1848 dev->name); 1849 return; 1850 } 1851 1852 /* 1853 * Two things going on here: 1854 * 1) Add routes for on-link prefixes 1855 * 2) Configure prefixes with the auto flag set 1856 */ 1857 1858 if (pinfo->onlink) { 1859 struct rt6_info *rt; 1860 unsigned long rt_expires; 1861 1862 /* Avoid arithmetic overflow. Really, we could 1863 * save rt_expires in seconds, likely valid_lft, 1864 * but it would require division in fib gc, that it 1865 * not good. 1866 */ 1867 if (HZ > USER_HZ) 1868 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1869 else 1870 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1871 1872 if (addrconf_finite_timeout(rt_expires)) 1873 rt_expires *= HZ; 1874 1875 rt = addrconf_get_prefix_route(&pinfo->prefix, 1876 pinfo->prefix_len, 1877 dev, 1878 RTF_ADDRCONF | RTF_PREFIX_RT, 1879 RTF_GATEWAY | RTF_DEFAULT); 1880 1881 if (rt) { 1882 /* Autoconf prefix route */ 1883 if (valid_lft == 0) { 1884 ip6_del_rt(rt); 1885 rt = NULL; 1886 } else if (addrconf_finite_timeout(rt_expires)) { 1887 /* not infinity */ 1888 rt6_set_expires(rt, jiffies + rt_expires); 1889 } else { 1890 rt6_clean_expires(rt); 1891 } 1892 } else if (valid_lft) { 1893 clock_t expires = 0; 1894 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1895 if (addrconf_finite_timeout(rt_expires)) { 1896 /* not infinity */ 1897 flags |= RTF_EXPIRES; 1898 expires = jiffies_to_clock_t(rt_expires); 1899 } 1900 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1901 dev, expires, flags); 1902 } 1903 if (rt) 1904 dst_release(&rt->dst); 1905 } 1906 1907 /* Try to figure out our local address for this prefix */ 1908 1909 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1910 struct inet6_ifaddr *ifp; 1911 struct in6_addr addr; 1912 int create = 0, update_lft = 0; 1913 1914 if (pinfo->prefix_len == 64) { 1915 memcpy(&addr, &pinfo->prefix, 8); 1916 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1917 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1918 in6_dev_put(in6_dev); 1919 return; 1920 } 1921 goto ok; 1922 } 1923 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 1924 pinfo->prefix_len); 1925 in6_dev_put(in6_dev); 1926 return; 1927 1928 ok: 1929 1930 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1931 1932 if (ifp == NULL && valid_lft) { 1933 int max_addresses = in6_dev->cnf.max_addresses; 1934 u32 addr_flags = 0; 1935 1936 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1937 if (in6_dev->cnf.optimistic_dad && 1938 !net->ipv6.devconf_all->forwarding && sllao) 1939 addr_flags = IFA_F_OPTIMISTIC; 1940 #endif 1941 1942 /* Do not allow to create too much of autoconfigured 1943 * addresses; this would be too easy way to crash kernel. 1944 */ 1945 if (!max_addresses || 1946 ipv6_count_addresses(in6_dev) < max_addresses) 1947 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1948 addr_type&IPV6_ADDR_SCOPE_MASK, 1949 addr_flags); 1950 1951 if (!ifp || IS_ERR(ifp)) { 1952 in6_dev_put(in6_dev); 1953 return; 1954 } 1955 1956 update_lft = create = 1; 1957 ifp->cstamp = jiffies; 1958 addrconf_dad_start(ifp); 1959 } 1960 1961 if (ifp) { 1962 int flags; 1963 unsigned long now; 1964 #ifdef CONFIG_IPV6_PRIVACY 1965 struct inet6_ifaddr *ift; 1966 #endif 1967 u32 stored_lft; 1968 1969 /* update lifetime (RFC2462 5.5.3 e) */ 1970 spin_lock(&ifp->lock); 1971 now = jiffies; 1972 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1973 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1974 else 1975 stored_lft = 0; 1976 if (!update_lft && stored_lft) { 1977 if (valid_lft > MIN_VALID_LIFETIME || 1978 valid_lft > stored_lft) 1979 update_lft = 1; 1980 else if (stored_lft <= MIN_VALID_LIFETIME) { 1981 /* valid_lft <= stored_lft is always true */ 1982 /* 1983 * RFC 4862 Section 5.5.3e: 1984 * "Note that the preferred lifetime of 1985 * the corresponding address is always 1986 * reset to the Preferred Lifetime in 1987 * the received Prefix Information 1988 * option, regardless of whether the 1989 * valid lifetime is also reset or 1990 * ignored." 1991 * 1992 * So if the preferred lifetime in 1993 * this advertisement is different 1994 * than what we have stored, but the 1995 * valid lifetime is invalid, just 1996 * reset prefered_lft. 1997 * 1998 * We must set the valid lifetime 1999 * to the stored lifetime since we'll 2000 * be updating the timestamp below, 2001 * else we'll set it back to the 2002 * minimum. 2003 */ 2004 if (prefered_lft != ifp->prefered_lft) { 2005 valid_lft = stored_lft; 2006 update_lft = 1; 2007 } 2008 } else { 2009 valid_lft = MIN_VALID_LIFETIME; 2010 if (valid_lft < prefered_lft) 2011 prefered_lft = valid_lft; 2012 update_lft = 1; 2013 } 2014 } 2015 2016 if (update_lft) { 2017 ifp->valid_lft = valid_lft; 2018 ifp->prefered_lft = prefered_lft; 2019 ifp->tstamp = now; 2020 flags = ifp->flags; 2021 ifp->flags &= ~IFA_F_DEPRECATED; 2022 spin_unlock(&ifp->lock); 2023 2024 if (!(flags&IFA_F_TENTATIVE)) 2025 ipv6_ifa_notify(0, ifp); 2026 } else 2027 spin_unlock(&ifp->lock); 2028 2029 #ifdef CONFIG_IPV6_PRIVACY 2030 read_lock_bh(&in6_dev->lock); 2031 /* update all temporary addresses in the list */ 2032 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2033 tmp_list) { 2034 int age, max_valid, max_prefered; 2035 2036 if (ifp != ift->ifpub) 2037 continue; 2038 2039 /* 2040 * RFC 4941 section 3.3: 2041 * If a received option will extend the lifetime 2042 * of a public address, the lifetimes of 2043 * temporary addresses should be extended, 2044 * subject to the overall constraint that no 2045 * temporary addresses should ever remain 2046 * "valid" or "preferred" for a time longer than 2047 * (TEMP_VALID_LIFETIME) or 2048 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2049 * respectively. 2050 */ 2051 age = (now - ift->cstamp) / HZ; 2052 max_valid = in6_dev->cnf.temp_valid_lft - age; 2053 if (max_valid < 0) 2054 max_valid = 0; 2055 2056 max_prefered = in6_dev->cnf.temp_prefered_lft - 2057 in6_dev->cnf.max_desync_factor - 2058 age; 2059 if (max_prefered < 0) 2060 max_prefered = 0; 2061 2062 if (valid_lft > max_valid) 2063 valid_lft = max_valid; 2064 2065 if (prefered_lft > max_prefered) 2066 prefered_lft = max_prefered; 2067 2068 spin_lock(&ift->lock); 2069 flags = ift->flags; 2070 ift->valid_lft = valid_lft; 2071 ift->prefered_lft = prefered_lft; 2072 ift->tstamp = now; 2073 if (prefered_lft > 0) 2074 ift->flags &= ~IFA_F_DEPRECATED; 2075 2076 spin_unlock(&ift->lock); 2077 if (!(flags&IFA_F_TENTATIVE)) 2078 ipv6_ifa_notify(0, ift); 2079 } 2080 2081 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2082 /* 2083 * When a new public address is created as 2084 * described in [ADDRCONF], also create a new 2085 * temporary address. Also create a temporary 2086 * address if it's enabled but no temporary 2087 * address currently exists. 2088 */ 2089 read_unlock_bh(&in6_dev->lock); 2090 ipv6_create_tempaddr(ifp, NULL); 2091 } else { 2092 read_unlock_bh(&in6_dev->lock); 2093 } 2094 #endif 2095 in6_ifa_put(ifp); 2096 addrconf_verify(0); 2097 } 2098 } 2099 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2100 in6_dev_put(in6_dev); 2101 } 2102 2103 /* 2104 * Set destination address. 2105 * Special case for SIT interfaces where we create a new "virtual" 2106 * device. 2107 */ 2108 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2109 { 2110 struct in6_ifreq ireq; 2111 struct net_device *dev; 2112 int err = -EINVAL; 2113 2114 rtnl_lock(); 2115 2116 err = -EFAULT; 2117 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2118 goto err_exit; 2119 2120 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2121 2122 err = -ENODEV; 2123 if (dev == NULL) 2124 goto err_exit; 2125 2126 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2127 if (dev->type == ARPHRD_SIT) { 2128 const struct net_device_ops *ops = dev->netdev_ops; 2129 struct ifreq ifr; 2130 struct ip_tunnel_parm p; 2131 2132 err = -EADDRNOTAVAIL; 2133 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2134 goto err_exit; 2135 2136 memset(&p, 0, sizeof(p)); 2137 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2138 p.iph.saddr = 0; 2139 p.iph.version = 4; 2140 p.iph.ihl = 5; 2141 p.iph.protocol = IPPROTO_IPV6; 2142 p.iph.ttl = 64; 2143 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2144 2145 if (ops->ndo_do_ioctl) { 2146 mm_segment_t oldfs = get_fs(); 2147 2148 set_fs(KERNEL_DS); 2149 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2150 set_fs(oldfs); 2151 } else 2152 err = -EOPNOTSUPP; 2153 2154 if (err == 0) { 2155 err = -ENOBUFS; 2156 dev = __dev_get_by_name(net, p.name); 2157 if (!dev) 2158 goto err_exit; 2159 err = dev_open(dev); 2160 } 2161 } 2162 #endif 2163 2164 err_exit: 2165 rtnl_unlock(); 2166 return err; 2167 } 2168 2169 /* 2170 * Manual configuration of address on an interface 2171 */ 2172 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2173 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2174 __u32 valid_lft) 2175 { 2176 struct inet6_ifaddr *ifp; 2177 struct inet6_dev *idev; 2178 struct net_device *dev; 2179 int scope; 2180 u32 flags; 2181 clock_t expires; 2182 unsigned long timeout; 2183 2184 ASSERT_RTNL(); 2185 2186 if (plen > 128) 2187 return -EINVAL; 2188 2189 /* check the lifetime */ 2190 if (!valid_lft || prefered_lft > valid_lft) 2191 return -EINVAL; 2192 2193 dev = __dev_get_by_index(net, ifindex); 2194 if (!dev) 2195 return -ENODEV; 2196 2197 idev = addrconf_add_dev(dev); 2198 if (IS_ERR(idev)) 2199 return PTR_ERR(idev); 2200 2201 scope = ipv6_addr_scope(pfx); 2202 2203 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2204 if (addrconf_finite_timeout(timeout)) { 2205 expires = jiffies_to_clock_t(timeout * HZ); 2206 valid_lft = timeout; 2207 flags = RTF_EXPIRES; 2208 } else { 2209 expires = 0; 2210 flags = 0; 2211 ifa_flags |= IFA_F_PERMANENT; 2212 } 2213 2214 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2215 if (addrconf_finite_timeout(timeout)) { 2216 if (timeout == 0) 2217 ifa_flags |= IFA_F_DEPRECATED; 2218 prefered_lft = timeout; 2219 } 2220 2221 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2222 2223 if (!IS_ERR(ifp)) { 2224 spin_lock_bh(&ifp->lock); 2225 ifp->valid_lft = valid_lft; 2226 ifp->prefered_lft = prefered_lft; 2227 ifp->tstamp = jiffies; 2228 spin_unlock_bh(&ifp->lock); 2229 2230 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2231 expires, flags); 2232 /* 2233 * Note that section 3.1 of RFC 4429 indicates 2234 * that the Optimistic flag should not be set for 2235 * manually configured addresses 2236 */ 2237 addrconf_dad_start(ifp); 2238 in6_ifa_put(ifp); 2239 addrconf_verify(0); 2240 return 0; 2241 } 2242 2243 return PTR_ERR(ifp); 2244 } 2245 2246 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2247 unsigned int plen) 2248 { 2249 struct inet6_ifaddr *ifp; 2250 struct inet6_dev *idev; 2251 struct net_device *dev; 2252 2253 if (plen > 128) 2254 return -EINVAL; 2255 2256 dev = __dev_get_by_index(net, ifindex); 2257 if (!dev) 2258 return -ENODEV; 2259 2260 if ((idev = __in6_dev_get(dev)) == NULL) 2261 return -ENXIO; 2262 2263 read_lock_bh(&idev->lock); 2264 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2265 if (ifp->prefix_len == plen && 2266 ipv6_addr_equal(pfx, &ifp->addr)) { 2267 in6_ifa_hold(ifp); 2268 read_unlock_bh(&idev->lock); 2269 2270 ipv6_del_addr(ifp); 2271 2272 /* If the last address is deleted administratively, 2273 disable IPv6 on this interface. 2274 */ 2275 if (list_empty(&idev->addr_list)) 2276 addrconf_ifdown(idev->dev, 1); 2277 return 0; 2278 } 2279 } 2280 read_unlock_bh(&idev->lock); 2281 return -EADDRNOTAVAIL; 2282 } 2283 2284 2285 int addrconf_add_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_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2298 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2299 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2300 rtnl_unlock(); 2301 return err; 2302 } 2303 2304 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2305 { 2306 struct in6_ifreq ireq; 2307 int err; 2308 2309 if (!capable(CAP_NET_ADMIN)) 2310 return -EPERM; 2311 2312 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2313 return -EFAULT; 2314 2315 rtnl_lock(); 2316 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2317 ireq.ifr6_prefixlen); 2318 rtnl_unlock(); 2319 return err; 2320 } 2321 2322 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2323 int plen, int scope) 2324 { 2325 struct inet6_ifaddr *ifp; 2326 2327 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2328 if (!IS_ERR(ifp)) { 2329 spin_lock_bh(&ifp->lock); 2330 ifp->flags &= ~IFA_F_TENTATIVE; 2331 spin_unlock_bh(&ifp->lock); 2332 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2333 in6_ifa_put(ifp); 2334 } 2335 } 2336 2337 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2338 static void sit_add_v4_addrs(struct inet6_dev *idev) 2339 { 2340 struct in6_addr addr; 2341 struct net_device *dev; 2342 struct net *net = dev_net(idev->dev); 2343 int scope; 2344 2345 ASSERT_RTNL(); 2346 2347 memset(&addr, 0, sizeof(struct in6_addr)); 2348 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2349 2350 if (idev->dev->flags&IFF_POINTOPOINT) { 2351 addr.s6_addr32[0] = htonl(0xfe800000); 2352 scope = IFA_LINK; 2353 } else { 2354 scope = IPV6_ADDR_COMPATv4; 2355 } 2356 2357 if (addr.s6_addr32[3]) { 2358 add_addr(idev, &addr, 128, scope); 2359 return; 2360 } 2361 2362 for_each_netdev(net, dev) { 2363 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2364 if (in_dev && (dev->flags & IFF_UP)) { 2365 struct in_ifaddr *ifa; 2366 2367 int flag = scope; 2368 2369 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2370 int plen; 2371 2372 addr.s6_addr32[3] = ifa->ifa_local; 2373 2374 if (ifa->ifa_scope == RT_SCOPE_LINK) 2375 continue; 2376 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2377 if (idev->dev->flags&IFF_POINTOPOINT) 2378 continue; 2379 flag |= IFA_HOST; 2380 } 2381 if (idev->dev->flags&IFF_POINTOPOINT) 2382 plen = 64; 2383 else 2384 plen = 96; 2385 2386 add_addr(idev, &addr, plen, flag); 2387 } 2388 } 2389 } 2390 } 2391 #endif 2392 2393 static void init_loopback(struct net_device *dev) 2394 { 2395 struct inet6_dev *idev; 2396 2397 /* ::1 */ 2398 2399 ASSERT_RTNL(); 2400 2401 if ((idev = ipv6_find_idev(dev)) == NULL) { 2402 pr_debug("%s: add_dev failed\n", __func__); 2403 return; 2404 } 2405 2406 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2407 } 2408 2409 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2410 { 2411 struct inet6_ifaddr *ifp; 2412 u32 addr_flags = IFA_F_PERMANENT; 2413 2414 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2415 if (idev->cnf.optimistic_dad && 2416 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2417 addr_flags |= IFA_F_OPTIMISTIC; 2418 #endif 2419 2420 2421 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2422 if (!IS_ERR(ifp)) { 2423 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2424 addrconf_dad_start(ifp); 2425 in6_ifa_put(ifp); 2426 } 2427 } 2428 2429 static void addrconf_dev_config(struct net_device *dev) 2430 { 2431 struct in6_addr addr; 2432 struct inet6_dev *idev; 2433 2434 ASSERT_RTNL(); 2435 2436 if ((dev->type != ARPHRD_ETHER) && 2437 (dev->type != ARPHRD_FDDI) && 2438 (dev->type != ARPHRD_ARCNET) && 2439 (dev->type != ARPHRD_INFINIBAND) && 2440 (dev->type != ARPHRD_IEEE802154)) { 2441 /* Alas, we support only Ethernet autoconfiguration. */ 2442 return; 2443 } 2444 2445 idev = addrconf_add_dev(dev); 2446 if (IS_ERR(idev)) 2447 return; 2448 2449 memset(&addr, 0, sizeof(struct in6_addr)); 2450 addr.s6_addr32[0] = htonl(0xFE800000); 2451 2452 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2453 addrconf_add_linklocal(idev, &addr); 2454 } 2455 2456 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2457 static void addrconf_sit_config(struct net_device *dev) 2458 { 2459 struct inet6_dev *idev; 2460 2461 ASSERT_RTNL(); 2462 2463 /* 2464 * Configure the tunnel with one of our IPv4 2465 * addresses... we should configure all of 2466 * our v4 addrs in the tunnel 2467 */ 2468 2469 if ((idev = ipv6_find_idev(dev)) == NULL) { 2470 pr_debug("%s: add_dev failed\n", __func__); 2471 return; 2472 } 2473 2474 if (dev->priv_flags & IFF_ISATAP) { 2475 struct in6_addr addr; 2476 2477 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2478 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2479 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2480 addrconf_add_linklocal(idev, &addr); 2481 return; 2482 } 2483 2484 sit_add_v4_addrs(idev); 2485 2486 if (dev->flags&IFF_POINTOPOINT) { 2487 addrconf_add_mroute(dev); 2488 addrconf_add_lroute(dev); 2489 } else 2490 sit_route_add(dev); 2491 } 2492 #endif 2493 2494 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2495 static void addrconf_gre_config(struct net_device *dev) 2496 { 2497 struct inet6_dev *idev; 2498 struct in6_addr addr; 2499 2500 pr_info("%s(%s)\n", __func__, dev->name); 2501 2502 ASSERT_RTNL(); 2503 2504 if ((idev = ipv6_find_idev(dev)) == NULL) { 2505 pr_debug("%s: add_dev failed\n", __func__); 2506 return; 2507 } 2508 2509 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2510 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2511 2512 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2513 addrconf_add_linklocal(idev, &addr); 2514 } 2515 #endif 2516 2517 static inline int 2518 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2519 { 2520 struct in6_addr lladdr; 2521 2522 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2523 addrconf_add_linklocal(idev, &lladdr); 2524 return 0; 2525 } 2526 return -1; 2527 } 2528 2529 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2530 { 2531 struct net_device *link_dev; 2532 struct net *net = dev_net(idev->dev); 2533 2534 /* first try to inherit the link-local address from the link device */ 2535 if (idev->dev->iflink && 2536 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2537 if (!ipv6_inherit_linklocal(idev, link_dev)) 2538 return; 2539 } 2540 /* then try to inherit it from any device */ 2541 for_each_netdev(net, link_dev) { 2542 if (!ipv6_inherit_linklocal(idev, link_dev)) 2543 return; 2544 } 2545 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2546 } 2547 2548 /* 2549 * Autoconfigure tunnel with a link-local address so routing protocols, 2550 * DHCPv6, MLD etc. can be run over the virtual link 2551 */ 2552 2553 static void addrconf_ip6_tnl_config(struct net_device *dev) 2554 { 2555 struct inet6_dev *idev; 2556 2557 ASSERT_RTNL(); 2558 2559 idev = addrconf_add_dev(dev); 2560 if (IS_ERR(idev)) { 2561 pr_debug("init ip6-ip6: add_dev failed\n"); 2562 return; 2563 } 2564 ip6_tnl_add_linklocal(idev); 2565 } 2566 2567 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2568 void *data) 2569 { 2570 struct net_device *dev = (struct net_device *) data; 2571 struct inet6_dev *idev = __in6_dev_get(dev); 2572 int run_pending = 0; 2573 int err; 2574 2575 switch (event) { 2576 case NETDEV_REGISTER: 2577 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2578 idev = ipv6_add_dev(dev); 2579 if (!idev) 2580 return notifier_from_errno(-ENOMEM); 2581 } 2582 break; 2583 2584 case NETDEV_UP: 2585 case NETDEV_CHANGE: 2586 if (dev->flags & IFF_SLAVE) 2587 break; 2588 2589 if (event == NETDEV_UP) { 2590 if (!addrconf_qdisc_ok(dev)) { 2591 /* device is not ready yet. */ 2592 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2593 dev->name); 2594 break; 2595 } 2596 2597 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2598 idev = ipv6_add_dev(dev); 2599 2600 if (idev) { 2601 idev->if_flags |= IF_READY; 2602 run_pending = 1; 2603 } 2604 } else { 2605 if (!addrconf_qdisc_ok(dev)) { 2606 /* device is still not ready. */ 2607 break; 2608 } 2609 2610 if (idev) { 2611 if (idev->if_flags & IF_READY) 2612 /* device is already configured. */ 2613 break; 2614 idev->if_flags |= IF_READY; 2615 } 2616 2617 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2618 dev->name); 2619 2620 run_pending = 1; 2621 } 2622 2623 switch (dev->type) { 2624 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2625 case ARPHRD_SIT: 2626 addrconf_sit_config(dev); 2627 break; 2628 #endif 2629 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2630 case ARPHRD_IPGRE: 2631 addrconf_gre_config(dev); 2632 break; 2633 #endif 2634 case ARPHRD_TUNNEL6: 2635 addrconf_ip6_tnl_config(dev); 2636 break; 2637 case ARPHRD_LOOPBACK: 2638 init_loopback(dev); 2639 break; 2640 2641 default: 2642 addrconf_dev_config(dev); 2643 break; 2644 } 2645 2646 if (idev) { 2647 if (run_pending) 2648 addrconf_dad_run(idev); 2649 2650 /* 2651 * If the MTU changed during the interface down, 2652 * when the interface up, the changed MTU must be 2653 * reflected in the idev as well as routers. 2654 */ 2655 if (idev->cnf.mtu6 != dev->mtu && 2656 dev->mtu >= IPV6_MIN_MTU) { 2657 rt6_mtu_change(dev, dev->mtu); 2658 idev->cnf.mtu6 = dev->mtu; 2659 } 2660 idev->tstamp = jiffies; 2661 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2662 2663 /* 2664 * If the changed mtu during down is lower than 2665 * IPV6_MIN_MTU stop IPv6 on this interface. 2666 */ 2667 if (dev->mtu < IPV6_MIN_MTU) 2668 addrconf_ifdown(dev, 1); 2669 } 2670 break; 2671 2672 case NETDEV_CHANGEMTU: 2673 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2674 rt6_mtu_change(dev, dev->mtu); 2675 idev->cnf.mtu6 = dev->mtu; 2676 break; 2677 } 2678 2679 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2680 idev = ipv6_add_dev(dev); 2681 if (idev) 2682 break; 2683 } 2684 2685 /* 2686 * MTU falled under IPV6_MIN_MTU. 2687 * Stop IPv6 on this interface. 2688 */ 2689 2690 case NETDEV_DOWN: 2691 case NETDEV_UNREGISTER: 2692 /* 2693 * Remove all addresses from this interface. 2694 */ 2695 addrconf_ifdown(dev, event != NETDEV_DOWN); 2696 break; 2697 2698 case NETDEV_CHANGENAME: 2699 if (idev) { 2700 snmp6_unregister_dev(idev); 2701 addrconf_sysctl_unregister(idev); 2702 addrconf_sysctl_register(idev); 2703 err = snmp6_register_dev(idev); 2704 if (err) 2705 return notifier_from_errno(err); 2706 } 2707 break; 2708 2709 case NETDEV_PRE_TYPE_CHANGE: 2710 case NETDEV_POST_TYPE_CHANGE: 2711 addrconf_type_change(dev, event); 2712 break; 2713 } 2714 2715 return NOTIFY_OK; 2716 } 2717 2718 /* 2719 * addrconf module should be notified of a device going up 2720 */ 2721 static struct notifier_block ipv6_dev_notf = { 2722 .notifier_call = addrconf_notify, 2723 }; 2724 2725 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2726 { 2727 struct inet6_dev *idev; 2728 ASSERT_RTNL(); 2729 2730 idev = __in6_dev_get(dev); 2731 2732 if (event == NETDEV_POST_TYPE_CHANGE) 2733 ipv6_mc_remap(idev); 2734 else if (event == NETDEV_PRE_TYPE_CHANGE) 2735 ipv6_mc_unmap(idev); 2736 } 2737 2738 static int addrconf_ifdown(struct net_device *dev, int how) 2739 { 2740 struct net *net = dev_net(dev); 2741 struct inet6_dev *idev; 2742 struct inet6_ifaddr *ifa; 2743 int state, i; 2744 2745 ASSERT_RTNL(); 2746 2747 rt6_ifdown(net, dev); 2748 neigh_ifdown(&nd_tbl, dev); 2749 2750 idev = __in6_dev_get(dev); 2751 if (idev == NULL) 2752 return -ENODEV; 2753 2754 /* 2755 * Step 1: remove reference to ipv6 device from parent device. 2756 * Do not dev_put! 2757 */ 2758 if (how) { 2759 idev->dead = 1; 2760 2761 /* protected by rtnl_lock */ 2762 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2763 2764 /* Step 1.5: remove snmp6 entry */ 2765 snmp6_unregister_dev(idev); 2766 2767 } 2768 2769 /* Step 2: clear hash table */ 2770 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2771 struct hlist_head *h = &inet6_addr_lst[i]; 2772 struct hlist_node *n; 2773 2774 spin_lock_bh(&addrconf_hash_lock); 2775 restart: 2776 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2777 if (ifa->idev == idev) { 2778 hlist_del_init_rcu(&ifa->addr_lst); 2779 addrconf_del_timer(ifa); 2780 goto restart; 2781 } 2782 } 2783 spin_unlock_bh(&addrconf_hash_lock); 2784 } 2785 2786 write_lock_bh(&idev->lock); 2787 2788 /* Step 2: clear flags for stateless addrconf */ 2789 if (!how) 2790 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2791 2792 #ifdef CONFIG_IPV6_PRIVACY 2793 if (how && del_timer(&idev->regen_timer)) 2794 in6_dev_put(idev); 2795 2796 /* Step 3: clear tempaddr list */ 2797 while (!list_empty(&idev->tempaddr_list)) { 2798 ifa = list_first_entry(&idev->tempaddr_list, 2799 struct inet6_ifaddr, tmp_list); 2800 list_del(&ifa->tmp_list); 2801 write_unlock_bh(&idev->lock); 2802 spin_lock_bh(&ifa->lock); 2803 2804 if (ifa->ifpub) { 2805 in6_ifa_put(ifa->ifpub); 2806 ifa->ifpub = NULL; 2807 } 2808 spin_unlock_bh(&ifa->lock); 2809 in6_ifa_put(ifa); 2810 write_lock_bh(&idev->lock); 2811 } 2812 #endif 2813 2814 while (!list_empty(&idev->addr_list)) { 2815 ifa = list_first_entry(&idev->addr_list, 2816 struct inet6_ifaddr, if_list); 2817 addrconf_del_timer(ifa); 2818 2819 list_del(&ifa->if_list); 2820 2821 write_unlock_bh(&idev->lock); 2822 2823 spin_lock_bh(&ifa->state_lock); 2824 state = ifa->state; 2825 ifa->state = INET6_IFADDR_STATE_DEAD; 2826 spin_unlock_bh(&ifa->state_lock); 2827 2828 if (state != INET6_IFADDR_STATE_DEAD) { 2829 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2830 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2831 } 2832 in6_ifa_put(ifa); 2833 2834 write_lock_bh(&idev->lock); 2835 } 2836 2837 write_unlock_bh(&idev->lock); 2838 2839 /* Step 5: Discard multicast list */ 2840 if (how) 2841 ipv6_mc_destroy_dev(idev); 2842 else 2843 ipv6_mc_down(idev); 2844 2845 idev->tstamp = jiffies; 2846 2847 /* Last: Shot the device (if unregistered) */ 2848 if (how) { 2849 addrconf_sysctl_unregister(idev); 2850 neigh_parms_release(&nd_tbl, idev->nd_parms); 2851 neigh_ifdown(&nd_tbl, dev); 2852 in6_dev_put(idev); 2853 } 2854 return 0; 2855 } 2856 2857 static void addrconf_rs_timer(unsigned long data) 2858 { 2859 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2860 struct inet6_dev *idev = ifp->idev; 2861 2862 read_lock(&idev->lock); 2863 if (idev->dead || !(idev->if_flags & IF_READY)) 2864 goto out; 2865 2866 if (idev->cnf.forwarding) 2867 goto out; 2868 2869 /* Announcement received after solicitation was sent */ 2870 if (idev->if_flags & IF_RA_RCVD) 2871 goto out; 2872 2873 spin_lock(&ifp->lock); 2874 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2875 /* The wait after the last probe can be shorter */ 2876 addrconf_mod_timer(ifp, AC_RS, 2877 (ifp->probes == idev->cnf.rtr_solicits) ? 2878 idev->cnf.rtr_solicit_delay : 2879 idev->cnf.rtr_solicit_interval); 2880 spin_unlock(&ifp->lock); 2881 2882 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2883 } else { 2884 spin_unlock(&ifp->lock); 2885 /* 2886 * Note: we do not support deprecated "all on-link" 2887 * assumption any longer. 2888 */ 2889 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 2890 } 2891 2892 out: 2893 read_unlock(&idev->lock); 2894 in6_ifa_put(ifp); 2895 } 2896 2897 /* 2898 * Duplicate Address Detection 2899 */ 2900 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2901 { 2902 unsigned long rand_num; 2903 struct inet6_dev *idev = ifp->idev; 2904 2905 if (ifp->flags & IFA_F_OPTIMISTIC) 2906 rand_num = 0; 2907 else 2908 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2909 2910 ifp->probes = idev->cnf.dad_transmits; 2911 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2912 } 2913 2914 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 2915 { 2916 struct inet6_dev *idev = ifp->idev; 2917 struct net_device *dev = idev->dev; 2918 2919 addrconf_join_solict(dev, &ifp->addr); 2920 2921 net_srandom(ifp->addr.s6_addr32[3]); 2922 2923 read_lock_bh(&idev->lock); 2924 spin_lock(&ifp->lock); 2925 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2926 goto out; 2927 2928 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2929 idev->cnf.accept_dad < 1 || 2930 !(ifp->flags&IFA_F_TENTATIVE) || 2931 ifp->flags & IFA_F_NODAD) { 2932 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2933 spin_unlock(&ifp->lock); 2934 read_unlock_bh(&idev->lock); 2935 2936 addrconf_dad_completed(ifp); 2937 return; 2938 } 2939 2940 if (!(idev->if_flags & IF_READY)) { 2941 spin_unlock(&ifp->lock); 2942 read_unlock_bh(&idev->lock); 2943 /* 2944 * If the device is not ready: 2945 * - keep it tentative if it is a permanent address. 2946 * - otherwise, kill it. 2947 */ 2948 in6_ifa_hold(ifp); 2949 addrconf_dad_stop(ifp, 0); 2950 return; 2951 } 2952 2953 /* 2954 * Optimistic nodes can start receiving 2955 * Frames right away 2956 */ 2957 if (ifp->flags & IFA_F_OPTIMISTIC) 2958 ip6_ins_rt(ifp->rt); 2959 2960 addrconf_dad_kick(ifp); 2961 out: 2962 spin_unlock(&ifp->lock); 2963 read_unlock_bh(&idev->lock); 2964 } 2965 2966 static void addrconf_dad_timer(unsigned long data) 2967 { 2968 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2969 struct inet6_dev *idev = ifp->idev; 2970 struct in6_addr mcaddr; 2971 2972 if (!ifp->probes && addrconf_dad_end(ifp)) 2973 goto out; 2974 2975 read_lock(&idev->lock); 2976 if (idev->dead || !(idev->if_flags & IF_READY)) { 2977 read_unlock(&idev->lock); 2978 goto out; 2979 } 2980 2981 spin_lock(&ifp->lock); 2982 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2983 spin_unlock(&ifp->lock); 2984 read_unlock(&idev->lock); 2985 goto out; 2986 } 2987 2988 if (ifp->probes == 0) { 2989 /* 2990 * DAD was successful 2991 */ 2992 2993 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2994 spin_unlock(&ifp->lock); 2995 read_unlock(&idev->lock); 2996 2997 addrconf_dad_completed(ifp); 2998 2999 goto out; 3000 } 3001 3002 ifp->probes--; 3003 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3004 spin_unlock(&ifp->lock); 3005 read_unlock(&idev->lock); 3006 3007 /* send a neighbour solicitation for our addr */ 3008 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3009 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3010 out: 3011 in6_ifa_put(ifp); 3012 } 3013 3014 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3015 { 3016 struct net_device *dev = ifp->idev->dev; 3017 3018 /* 3019 * Configure the address for reception. Now it is valid. 3020 */ 3021 3022 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3023 3024 /* If added prefix is link local and we are prepared to process 3025 router advertisements, start sending router solicitations. 3026 */ 3027 3028 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) || 3029 ifp->idev->cnf.accept_ra == 2) && 3030 ifp->idev->cnf.rtr_solicits > 0 && 3031 (dev->flags&IFF_LOOPBACK) == 0 && 3032 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3033 /* 3034 * If a host as already performed a random delay 3035 * [...] as part of DAD [...] there is no need 3036 * to delay again before sending the first RS 3037 */ 3038 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3039 3040 spin_lock_bh(&ifp->lock); 3041 ifp->probes = 1; 3042 ifp->idev->if_flags |= IF_RS_SENT; 3043 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3044 spin_unlock_bh(&ifp->lock); 3045 } 3046 } 3047 3048 static void addrconf_dad_run(struct inet6_dev *idev) 3049 { 3050 struct inet6_ifaddr *ifp; 3051 3052 read_lock_bh(&idev->lock); 3053 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3054 spin_lock(&ifp->lock); 3055 if (ifp->flags & IFA_F_TENTATIVE && 3056 ifp->state == INET6_IFADDR_STATE_DAD) 3057 addrconf_dad_kick(ifp); 3058 spin_unlock(&ifp->lock); 3059 } 3060 read_unlock_bh(&idev->lock); 3061 } 3062 3063 #ifdef CONFIG_PROC_FS 3064 struct if6_iter_state { 3065 struct seq_net_private p; 3066 int bucket; 3067 int offset; 3068 }; 3069 3070 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3071 { 3072 struct inet6_ifaddr *ifa = NULL; 3073 struct if6_iter_state *state = seq->private; 3074 struct net *net = seq_file_net(seq); 3075 int p = 0; 3076 3077 /* initial bucket if pos is 0 */ 3078 if (pos == 0) { 3079 state->bucket = 0; 3080 state->offset = 0; 3081 } 3082 3083 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3084 struct hlist_node *n; 3085 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3086 addr_lst) { 3087 /* sync with offset */ 3088 if (p < state->offset) { 3089 p++; 3090 continue; 3091 } 3092 state->offset++; 3093 if (net_eq(dev_net(ifa->idev->dev), net)) 3094 return ifa; 3095 } 3096 3097 /* prepare for next bucket */ 3098 state->offset = 0; 3099 p = 0; 3100 } 3101 return NULL; 3102 } 3103 3104 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3105 struct inet6_ifaddr *ifa) 3106 { 3107 struct if6_iter_state *state = seq->private; 3108 struct net *net = seq_file_net(seq); 3109 struct hlist_node *n = &ifa->addr_lst; 3110 3111 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) { 3112 state->offset++; 3113 if (net_eq(dev_net(ifa->idev->dev), net)) 3114 return ifa; 3115 } 3116 3117 while (++state->bucket < IN6_ADDR_HSIZE) { 3118 state->offset = 0; 3119 hlist_for_each_entry_rcu_bh(ifa, n, 3120 &inet6_addr_lst[state->bucket], addr_lst) { 3121 state->offset++; 3122 if (net_eq(dev_net(ifa->idev->dev), net)) 3123 return ifa; 3124 } 3125 } 3126 3127 return NULL; 3128 } 3129 3130 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3131 __acquires(rcu_bh) 3132 { 3133 rcu_read_lock_bh(); 3134 return if6_get_first(seq, *pos); 3135 } 3136 3137 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3138 { 3139 struct inet6_ifaddr *ifa; 3140 3141 ifa = if6_get_next(seq, v); 3142 ++*pos; 3143 return ifa; 3144 } 3145 3146 static void if6_seq_stop(struct seq_file *seq, void *v) 3147 __releases(rcu_bh) 3148 { 3149 rcu_read_unlock_bh(); 3150 } 3151 3152 static int if6_seq_show(struct seq_file *seq, void *v) 3153 { 3154 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3155 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3156 &ifp->addr, 3157 ifp->idev->dev->ifindex, 3158 ifp->prefix_len, 3159 ifp->scope, 3160 ifp->flags, 3161 ifp->idev->dev->name); 3162 return 0; 3163 } 3164 3165 static const struct seq_operations if6_seq_ops = { 3166 .start = if6_seq_start, 3167 .next = if6_seq_next, 3168 .show = if6_seq_show, 3169 .stop = if6_seq_stop, 3170 }; 3171 3172 static int if6_seq_open(struct inode *inode, struct file *file) 3173 { 3174 return seq_open_net(inode, file, &if6_seq_ops, 3175 sizeof(struct if6_iter_state)); 3176 } 3177 3178 static const struct file_operations if6_fops = { 3179 .owner = THIS_MODULE, 3180 .open = if6_seq_open, 3181 .read = seq_read, 3182 .llseek = seq_lseek, 3183 .release = seq_release_net, 3184 }; 3185 3186 static int __net_init if6_proc_net_init(struct net *net) 3187 { 3188 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3189 return -ENOMEM; 3190 return 0; 3191 } 3192 3193 static void __net_exit if6_proc_net_exit(struct net *net) 3194 { 3195 proc_net_remove(net, "if_inet6"); 3196 } 3197 3198 static struct pernet_operations if6_proc_net_ops = { 3199 .init = if6_proc_net_init, 3200 .exit = if6_proc_net_exit, 3201 }; 3202 3203 int __init if6_proc_init(void) 3204 { 3205 return register_pernet_subsys(&if6_proc_net_ops); 3206 } 3207 3208 void if6_proc_exit(void) 3209 { 3210 unregister_pernet_subsys(&if6_proc_net_ops); 3211 } 3212 #endif /* CONFIG_PROC_FS */ 3213 3214 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3215 /* Check if address is a home address configured on any interface. */ 3216 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3217 { 3218 int ret = 0; 3219 struct inet6_ifaddr *ifp = NULL; 3220 struct hlist_node *n; 3221 unsigned int hash = inet6_addr_hash(addr); 3222 3223 rcu_read_lock_bh(); 3224 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3225 if (!net_eq(dev_net(ifp->idev->dev), net)) 3226 continue; 3227 if (ipv6_addr_equal(&ifp->addr, addr) && 3228 (ifp->flags & IFA_F_HOMEADDRESS)) { 3229 ret = 1; 3230 break; 3231 } 3232 } 3233 rcu_read_unlock_bh(); 3234 return ret; 3235 } 3236 #endif 3237 3238 /* 3239 * Periodic address status verification 3240 */ 3241 3242 static void addrconf_verify(unsigned long foo) 3243 { 3244 unsigned long now, next, next_sec, next_sched; 3245 struct inet6_ifaddr *ifp; 3246 struct hlist_node *node; 3247 int i; 3248 3249 rcu_read_lock_bh(); 3250 spin_lock(&addrconf_verify_lock); 3251 now = jiffies; 3252 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3253 3254 del_timer(&addr_chk_timer); 3255 3256 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3257 restart: 3258 hlist_for_each_entry_rcu_bh(ifp, node, 3259 &inet6_addr_lst[i], addr_lst) { 3260 unsigned long age; 3261 3262 if (ifp->flags & IFA_F_PERMANENT) 3263 continue; 3264 3265 spin_lock(&ifp->lock); 3266 /* We try to batch several events at once. */ 3267 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3268 3269 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3270 age >= ifp->valid_lft) { 3271 spin_unlock(&ifp->lock); 3272 in6_ifa_hold(ifp); 3273 ipv6_del_addr(ifp); 3274 goto restart; 3275 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3276 spin_unlock(&ifp->lock); 3277 continue; 3278 } else if (age >= ifp->prefered_lft) { 3279 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3280 int deprecate = 0; 3281 3282 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3283 deprecate = 1; 3284 ifp->flags |= IFA_F_DEPRECATED; 3285 } 3286 3287 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3288 next = ifp->tstamp + ifp->valid_lft * HZ; 3289 3290 spin_unlock(&ifp->lock); 3291 3292 if (deprecate) { 3293 in6_ifa_hold(ifp); 3294 3295 ipv6_ifa_notify(0, ifp); 3296 in6_ifa_put(ifp); 3297 goto restart; 3298 } 3299 #ifdef CONFIG_IPV6_PRIVACY 3300 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3301 !(ifp->flags&IFA_F_TENTATIVE)) { 3302 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3303 ifp->idev->cnf.dad_transmits * 3304 ifp->idev->nd_parms->retrans_time / HZ; 3305 3306 if (age >= ifp->prefered_lft - regen_advance) { 3307 struct inet6_ifaddr *ifpub = ifp->ifpub; 3308 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3309 next = ifp->tstamp + ifp->prefered_lft * HZ; 3310 if (!ifp->regen_count && ifpub) { 3311 ifp->regen_count++; 3312 in6_ifa_hold(ifp); 3313 in6_ifa_hold(ifpub); 3314 spin_unlock(&ifp->lock); 3315 3316 spin_lock(&ifpub->lock); 3317 ifpub->regen_count = 0; 3318 spin_unlock(&ifpub->lock); 3319 ipv6_create_tempaddr(ifpub, ifp); 3320 in6_ifa_put(ifpub); 3321 in6_ifa_put(ifp); 3322 goto restart; 3323 } 3324 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3325 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3326 spin_unlock(&ifp->lock); 3327 #endif 3328 } else { 3329 /* ifp->prefered_lft <= ifp->valid_lft */ 3330 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3331 next = ifp->tstamp + ifp->prefered_lft * HZ; 3332 spin_unlock(&ifp->lock); 3333 } 3334 } 3335 } 3336 3337 next_sec = round_jiffies_up(next); 3338 next_sched = next; 3339 3340 /* If rounded timeout is accurate enough, accept it. */ 3341 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3342 next_sched = next_sec; 3343 3344 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3345 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3346 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3347 3348 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3349 now, next, next_sec, next_sched)); 3350 3351 addr_chk_timer.expires = next_sched; 3352 add_timer(&addr_chk_timer); 3353 spin_unlock(&addrconf_verify_lock); 3354 rcu_read_unlock_bh(); 3355 } 3356 3357 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3358 { 3359 struct in6_addr *pfx = NULL; 3360 3361 if (addr) 3362 pfx = nla_data(addr); 3363 3364 if (local) { 3365 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3366 pfx = NULL; 3367 else 3368 pfx = nla_data(local); 3369 } 3370 3371 return pfx; 3372 } 3373 3374 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3375 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3376 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3377 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3378 }; 3379 3380 static int 3381 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3382 { 3383 struct net *net = sock_net(skb->sk); 3384 struct ifaddrmsg *ifm; 3385 struct nlattr *tb[IFA_MAX+1]; 3386 struct in6_addr *pfx; 3387 int err; 3388 3389 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3390 if (err < 0) 3391 return err; 3392 3393 ifm = nlmsg_data(nlh); 3394 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3395 if (pfx == NULL) 3396 return -EINVAL; 3397 3398 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3399 } 3400 3401 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3402 u32 prefered_lft, u32 valid_lft) 3403 { 3404 u32 flags; 3405 clock_t expires; 3406 unsigned long timeout; 3407 3408 if (!valid_lft || (prefered_lft > valid_lft)) 3409 return -EINVAL; 3410 3411 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3412 if (addrconf_finite_timeout(timeout)) { 3413 expires = jiffies_to_clock_t(timeout * HZ); 3414 valid_lft = timeout; 3415 flags = RTF_EXPIRES; 3416 } else { 3417 expires = 0; 3418 flags = 0; 3419 ifa_flags |= IFA_F_PERMANENT; 3420 } 3421 3422 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3423 if (addrconf_finite_timeout(timeout)) { 3424 if (timeout == 0) 3425 ifa_flags |= IFA_F_DEPRECATED; 3426 prefered_lft = timeout; 3427 } 3428 3429 spin_lock_bh(&ifp->lock); 3430 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3431 ifp->tstamp = jiffies; 3432 ifp->valid_lft = valid_lft; 3433 ifp->prefered_lft = prefered_lft; 3434 3435 spin_unlock_bh(&ifp->lock); 3436 if (!(ifp->flags&IFA_F_TENTATIVE)) 3437 ipv6_ifa_notify(0, ifp); 3438 3439 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3440 expires, flags); 3441 addrconf_verify(0); 3442 3443 return 0; 3444 } 3445 3446 static int 3447 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3448 { 3449 struct net *net = sock_net(skb->sk); 3450 struct ifaddrmsg *ifm; 3451 struct nlattr *tb[IFA_MAX+1]; 3452 struct in6_addr *pfx; 3453 struct inet6_ifaddr *ifa; 3454 struct net_device *dev; 3455 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3456 u8 ifa_flags; 3457 int err; 3458 3459 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3460 if (err < 0) 3461 return err; 3462 3463 ifm = nlmsg_data(nlh); 3464 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3465 if (pfx == NULL) 3466 return -EINVAL; 3467 3468 if (tb[IFA_CACHEINFO]) { 3469 struct ifa_cacheinfo *ci; 3470 3471 ci = nla_data(tb[IFA_CACHEINFO]); 3472 valid_lft = ci->ifa_valid; 3473 preferred_lft = ci->ifa_prefered; 3474 } else { 3475 preferred_lft = INFINITY_LIFE_TIME; 3476 valid_lft = INFINITY_LIFE_TIME; 3477 } 3478 3479 dev = __dev_get_by_index(net, ifm->ifa_index); 3480 if (dev == NULL) 3481 return -ENODEV; 3482 3483 /* We ignore other flags so far. */ 3484 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3485 3486 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3487 if (ifa == NULL) { 3488 /* 3489 * It would be best to check for !NLM_F_CREATE here but 3490 * userspace alreay relies on not having to provide this. 3491 */ 3492 return inet6_addr_add(net, ifm->ifa_index, pfx, 3493 ifm->ifa_prefixlen, ifa_flags, 3494 preferred_lft, valid_lft); 3495 } 3496 3497 if (nlh->nlmsg_flags & NLM_F_EXCL || 3498 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3499 err = -EEXIST; 3500 else 3501 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3502 3503 in6_ifa_put(ifa); 3504 3505 return err; 3506 } 3507 3508 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3509 u8 scope, int ifindex) 3510 { 3511 struct ifaddrmsg *ifm; 3512 3513 ifm = nlmsg_data(nlh); 3514 ifm->ifa_family = AF_INET6; 3515 ifm->ifa_prefixlen = prefixlen; 3516 ifm->ifa_flags = flags; 3517 ifm->ifa_scope = scope; 3518 ifm->ifa_index = ifindex; 3519 } 3520 3521 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3522 unsigned long tstamp, u32 preferred, u32 valid) 3523 { 3524 struct ifa_cacheinfo ci; 3525 3526 ci.cstamp = cstamp_delta(cstamp); 3527 ci.tstamp = cstamp_delta(tstamp); 3528 ci.ifa_prefered = preferred; 3529 ci.ifa_valid = valid; 3530 3531 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3532 } 3533 3534 static inline int rt_scope(int ifa_scope) 3535 { 3536 if (ifa_scope & IFA_HOST) 3537 return RT_SCOPE_HOST; 3538 else if (ifa_scope & IFA_LINK) 3539 return RT_SCOPE_LINK; 3540 else if (ifa_scope & IFA_SITE) 3541 return RT_SCOPE_SITE; 3542 else 3543 return RT_SCOPE_UNIVERSE; 3544 } 3545 3546 static inline int inet6_ifaddr_msgsize(void) 3547 { 3548 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3549 + nla_total_size(16) /* IFA_ADDRESS */ 3550 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3551 } 3552 3553 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3554 u32 pid, u32 seq, int event, unsigned int flags) 3555 { 3556 struct nlmsghdr *nlh; 3557 u32 preferred, valid; 3558 3559 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3560 if (nlh == NULL) 3561 return -EMSGSIZE; 3562 3563 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3564 ifa->idev->dev->ifindex); 3565 3566 if (!(ifa->flags&IFA_F_PERMANENT)) { 3567 preferred = ifa->prefered_lft; 3568 valid = ifa->valid_lft; 3569 if (preferred != INFINITY_LIFE_TIME) { 3570 long tval = (jiffies - ifa->tstamp)/HZ; 3571 if (preferred > tval) 3572 preferred -= tval; 3573 else 3574 preferred = 0; 3575 if (valid != INFINITY_LIFE_TIME) { 3576 if (valid > tval) 3577 valid -= tval; 3578 else 3579 valid = 0; 3580 } 3581 } 3582 } else { 3583 preferred = INFINITY_LIFE_TIME; 3584 valid = INFINITY_LIFE_TIME; 3585 } 3586 3587 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3588 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3589 nlmsg_cancel(skb, nlh); 3590 return -EMSGSIZE; 3591 } 3592 3593 return nlmsg_end(skb, nlh); 3594 } 3595 3596 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3597 u32 pid, u32 seq, int event, u16 flags) 3598 { 3599 struct nlmsghdr *nlh; 3600 u8 scope = RT_SCOPE_UNIVERSE; 3601 int ifindex = ifmca->idev->dev->ifindex; 3602 3603 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3604 scope = RT_SCOPE_SITE; 3605 3606 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3607 if (nlh == NULL) 3608 return -EMSGSIZE; 3609 3610 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3611 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3612 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3613 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3614 nlmsg_cancel(skb, nlh); 3615 return -EMSGSIZE; 3616 } 3617 3618 return nlmsg_end(skb, nlh); 3619 } 3620 3621 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3622 u32 pid, u32 seq, int event, unsigned int flags) 3623 { 3624 struct nlmsghdr *nlh; 3625 u8 scope = RT_SCOPE_UNIVERSE; 3626 int ifindex = ifaca->aca_idev->dev->ifindex; 3627 3628 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3629 scope = RT_SCOPE_SITE; 3630 3631 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3632 if (nlh == NULL) 3633 return -EMSGSIZE; 3634 3635 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3636 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3637 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3638 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3639 nlmsg_cancel(skb, nlh); 3640 return -EMSGSIZE; 3641 } 3642 3643 return nlmsg_end(skb, nlh); 3644 } 3645 3646 enum addr_type_t { 3647 UNICAST_ADDR, 3648 MULTICAST_ADDR, 3649 ANYCAST_ADDR, 3650 }; 3651 3652 /* called with rcu_read_lock() */ 3653 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3654 struct netlink_callback *cb, enum addr_type_t type, 3655 int s_ip_idx, int *p_ip_idx) 3656 { 3657 struct ifmcaddr6 *ifmca; 3658 struct ifacaddr6 *ifaca; 3659 int err = 1; 3660 int ip_idx = *p_ip_idx; 3661 3662 read_lock_bh(&idev->lock); 3663 switch (type) { 3664 case UNICAST_ADDR: { 3665 struct inet6_ifaddr *ifa; 3666 3667 /* unicast address incl. temp addr */ 3668 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3669 if (++ip_idx < s_ip_idx) 3670 continue; 3671 err = inet6_fill_ifaddr(skb, ifa, 3672 NETLINK_CB(cb->skb).pid, 3673 cb->nlh->nlmsg_seq, 3674 RTM_NEWADDR, 3675 NLM_F_MULTI); 3676 if (err <= 0) 3677 break; 3678 } 3679 break; 3680 } 3681 case MULTICAST_ADDR: 3682 /* multicast address */ 3683 for (ifmca = idev->mc_list; ifmca; 3684 ifmca = ifmca->next, ip_idx++) { 3685 if (ip_idx < s_ip_idx) 3686 continue; 3687 err = inet6_fill_ifmcaddr(skb, ifmca, 3688 NETLINK_CB(cb->skb).pid, 3689 cb->nlh->nlmsg_seq, 3690 RTM_GETMULTICAST, 3691 NLM_F_MULTI); 3692 if (err <= 0) 3693 break; 3694 } 3695 break; 3696 case ANYCAST_ADDR: 3697 /* anycast address */ 3698 for (ifaca = idev->ac_list; ifaca; 3699 ifaca = ifaca->aca_next, ip_idx++) { 3700 if (ip_idx < s_ip_idx) 3701 continue; 3702 err = inet6_fill_ifacaddr(skb, ifaca, 3703 NETLINK_CB(cb->skb).pid, 3704 cb->nlh->nlmsg_seq, 3705 RTM_GETANYCAST, 3706 NLM_F_MULTI); 3707 if (err <= 0) 3708 break; 3709 } 3710 break; 3711 default: 3712 break; 3713 } 3714 read_unlock_bh(&idev->lock); 3715 *p_ip_idx = ip_idx; 3716 return err; 3717 } 3718 3719 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3720 enum addr_type_t type) 3721 { 3722 struct net *net = sock_net(skb->sk); 3723 int h, s_h; 3724 int idx, ip_idx; 3725 int s_idx, s_ip_idx; 3726 struct net_device *dev; 3727 struct inet6_dev *idev; 3728 struct hlist_head *head; 3729 struct hlist_node *node; 3730 3731 s_h = cb->args[0]; 3732 s_idx = idx = cb->args[1]; 3733 s_ip_idx = ip_idx = cb->args[2]; 3734 3735 rcu_read_lock(); 3736 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3737 idx = 0; 3738 head = &net->dev_index_head[h]; 3739 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3740 if (idx < s_idx) 3741 goto cont; 3742 if (h > s_h || idx > s_idx) 3743 s_ip_idx = 0; 3744 ip_idx = 0; 3745 idev = __in6_dev_get(dev); 3746 if (!idev) 3747 goto cont; 3748 3749 if (in6_dump_addrs(idev, skb, cb, type, 3750 s_ip_idx, &ip_idx) <= 0) 3751 goto done; 3752 cont: 3753 idx++; 3754 } 3755 } 3756 done: 3757 rcu_read_unlock(); 3758 cb->args[0] = h; 3759 cb->args[1] = idx; 3760 cb->args[2] = ip_idx; 3761 3762 return skb->len; 3763 } 3764 3765 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3766 { 3767 enum addr_type_t type = UNICAST_ADDR; 3768 3769 return inet6_dump_addr(skb, cb, type); 3770 } 3771 3772 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3773 { 3774 enum addr_type_t type = MULTICAST_ADDR; 3775 3776 return inet6_dump_addr(skb, cb, type); 3777 } 3778 3779 3780 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3781 { 3782 enum addr_type_t type = ANYCAST_ADDR; 3783 3784 return inet6_dump_addr(skb, cb, type); 3785 } 3786 3787 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 3788 void *arg) 3789 { 3790 struct net *net = sock_net(in_skb->sk); 3791 struct ifaddrmsg *ifm; 3792 struct nlattr *tb[IFA_MAX+1]; 3793 struct in6_addr *addr = NULL; 3794 struct net_device *dev = NULL; 3795 struct inet6_ifaddr *ifa; 3796 struct sk_buff *skb; 3797 int err; 3798 3799 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3800 if (err < 0) 3801 goto errout; 3802 3803 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3804 if (addr == NULL) { 3805 err = -EINVAL; 3806 goto errout; 3807 } 3808 3809 ifm = nlmsg_data(nlh); 3810 if (ifm->ifa_index) 3811 dev = __dev_get_by_index(net, ifm->ifa_index); 3812 3813 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3814 if (!ifa) { 3815 err = -EADDRNOTAVAIL; 3816 goto errout; 3817 } 3818 3819 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3820 if (!skb) { 3821 err = -ENOBUFS; 3822 goto errout_ifa; 3823 } 3824 3825 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3826 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3827 if (err < 0) { 3828 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3829 WARN_ON(err == -EMSGSIZE); 3830 kfree_skb(skb); 3831 goto errout_ifa; 3832 } 3833 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3834 errout_ifa: 3835 in6_ifa_put(ifa); 3836 errout: 3837 return err; 3838 } 3839 3840 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3841 { 3842 struct sk_buff *skb; 3843 struct net *net = dev_net(ifa->idev->dev); 3844 int err = -ENOBUFS; 3845 3846 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3847 if (skb == NULL) 3848 goto errout; 3849 3850 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3851 if (err < 0) { 3852 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3853 WARN_ON(err == -EMSGSIZE); 3854 kfree_skb(skb); 3855 goto errout; 3856 } 3857 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3858 return; 3859 errout: 3860 if (err < 0) 3861 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3862 } 3863 3864 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3865 __s32 *array, int bytes) 3866 { 3867 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3868 3869 memset(array, 0, bytes); 3870 array[DEVCONF_FORWARDING] = cnf->forwarding; 3871 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3872 array[DEVCONF_MTU6] = cnf->mtu6; 3873 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3874 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3875 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3876 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3877 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3878 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3879 jiffies_to_msecs(cnf->rtr_solicit_interval); 3880 array[DEVCONF_RTR_SOLICIT_DELAY] = 3881 jiffies_to_msecs(cnf->rtr_solicit_delay); 3882 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3883 #ifdef CONFIG_IPV6_PRIVACY 3884 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3885 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3886 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3887 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3888 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3889 #endif 3890 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3891 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3892 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3893 #ifdef CONFIG_IPV6_ROUTER_PREF 3894 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3895 array[DEVCONF_RTR_PROBE_INTERVAL] = 3896 jiffies_to_msecs(cnf->rtr_probe_interval); 3897 #ifdef CONFIG_IPV6_ROUTE_INFO 3898 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3899 #endif 3900 #endif 3901 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3902 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3903 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3904 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3905 #endif 3906 #ifdef CONFIG_IPV6_MROUTE 3907 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3908 #endif 3909 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3910 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3911 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3912 } 3913 3914 static inline size_t inet6_ifla6_size(void) 3915 { 3916 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3917 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3918 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3919 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3920 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3921 } 3922 3923 static inline size_t inet6_if_nlmsg_size(void) 3924 { 3925 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3926 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3927 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3928 + nla_total_size(4) /* IFLA_MTU */ 3929 + nla_total_size(4) /* IFLA_LINK */ 3930 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3931 } 3932 3933 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3934 int items, int bytes) 3935 { 3936 int i; 3937 int pad = bytes - sizeof(u64) * items; 3938 BUG_ON(pad < 0); 3939 3940 /* Use put_unaligned() because stats may not be aligned for u64. */ 3941 put_unaligned(items, &stats[0]); 3942 for (i = 1; i < items; i++) 3943 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3944 3945 memset(&stats[items], 0, pad); 3946 } 3947 3948 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3949 int items, int bytes, size_t syncpoff) 3950 { 3951 int i; 3952 int pad = bytes - sizeof(u64) * items; 3953 BUG_ON(pad < 0); 3954 3955 /* Use put_unaligned() because stats may not be aligned for u64. */ 3956 put_unaligned(items, &stats[0]); 3957 for (i = 1; i < items; i++) 3958 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3959 3960 memset(&stats[items], 0, pad); 3961 } 3962 3963 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3964 int bytes) 3965 { 3966 switch (attrtype) { 3967 case IFLA_INET6_STATS: 3968 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3969 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3970 break; 3971 case IFLA_INET6_ICMP6STATS: 3972 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3973 break; 3974 } 3975 } 3976 3977 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3978 { 3979 struct nlattr *nla; 3980 struct ifla_cacheinfo ci; 3981 3982 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 3983 goto nla_put_failure; 3984 ci.max_reasm_len = IPV6_MAXPLEN; 3985 ci.tstamp = cstamp_delta(idev->tstamp); 3986 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3987 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3988 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 3989 goto nla_put_failure; 3990 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3991 if (nla == NULL) 3992 goto nla_put_failure; 3993 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3994 3995 /* XXX - MC not implemented */ 3996 3997 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3998 if (nla == NULL) 3999 goto nla_put_failure; 4000 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4001 4002 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4003 if (nla == NULL) 4004 goto nla_put_failure; 4005 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4006 4007 return 0; 4008 4009 nla_put_failure: 4010 return -EMSGSIZE; 4011 } 4012 4013 static size_t inet6_get_link_af_size(const struct net_device *dev) 4014 { 4015 if (!__in6_dev_get(dev)) 4016 return 0; 4017 4018 return inet6_ifla6_size(); 4019 } 4020 4021 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4022 { 4023 struct inet6_dev *idev = __in6_dev_get(dev); 4024 4025 if (!idev) 4026 return -ENODATA; 4027 4028 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4029 return -EMSGSIZE; 4030 4031 return 0; 4032 } 4033 4034 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4035 u32 pid, u32 seq, int event, unsigned int flags) 4036 { 4037 struct net_device *dev = idev->dev; 4038 struct ifinfomsg *hdr; 4039 struct nlmsghdr *nlh; 4040 void *protoinfo; 4041 4042 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 4043 if (nlh == NULL) 4044 return -EMSGSIZE; 4045 4046 hdr = nlmsg_data(nlh); 4047 hdr->ifi_family = AF_INET6; 4048 hdr->__ifi_pad = 0; 4049 hdr->ifi_type = dev->type; 4050 hdr->ifi_index = dev->ifindex; 4051 hdr->ifi_flags = dev_get_flags(dev); 4052 hdr->ifi_change = 0; 4053 4054 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4055 (dev->addr_len && 4056 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4057 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4058 (dev->ifindex != dev->iflink && 4059 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4060 goto nla_put_failure; 4061 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4062 if (protoinfo == NULL) 4063 goto nla_put_failure; 4064 4065 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4066 goto nla_put_failure; 4067 4068 nla_nest_end(skb, protoinfo); 4069 return nlmsg_end(skb, nlh); 4070 4071 nla_put_failure: 4072 nlmsg_cancel(skb, nlh); 4073 return -EMSGSIZE; 4074 } 4075 4076 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4077 { 4078 struct net *net = sock_net(skb->sk); 4079 int h, s_h; 4080 int idx = 0, s_idx; 4081 struct net_device *dev; 4082 struct inet6_dev *idev; 4083 struct hlist_head *head; 4084 struct hlist_node *node; 4085 4086 s_h = cb->args[0]; 4087 s_idx = cb->args[1]; 4088 4089 rcu_read_lock(); 4090 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4091 idx = 0; 4092 head = &net->dev_index_head[h]; 4093 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4094 if (idx < s_idx) 4095 goto cont; 4096 idev = __in6_dev_get(dev); 4097 if (!idev) 4098 goto cont; 4099 if (inet6_fill_ifinfo(skb, idev, 4100 NETLINK_CB(cb->skb).pid, 4101 cb->nlh->nlmsg_seq, 4102 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4103 goto out; 4104 cont: 4105 idx++; 4106 } 4107 } 4108 out: 4109 rcu_read_unlock(); 4110 cb->args[1] = idx; 4111 cb->args[0] = h; 4112 4113 return skb->len; 4114 } 4115 4116 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4117 { 4118 struct sk_buff *skb; 4119 struct net *net = dev_net(idev->dev); 4120 int err = -ENOBUFS; 4121 4122 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4123 if (skb == NULL) 4124 goto errout; 4125 4126 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4127 if (err < 0) { 4128 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4129 WARN_ON(err == -EMSGSIZE); 4130 kfree_skb(skb); 4131 goto errout; 4132 } 4133 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4134 return; 4135 errout: 4136 if (err < 0) 4137 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4138 } 4139 4140 static inline size_t inet6_prefix_nlmsg_size(void) 4141 { 4142 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4143 + nla_total_size(sizeof(struct in6_addr)) 4144 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4145 } 4146 4147 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4148 struct prefix_info *pinfo, u32 pid, u32 seq, 4149 int event, unsigned int flags) 4150 { 4151 struct prefixmsg *pmsg; 4152 struct nlmsghdr *nlh; 4153 struct prefix_cacheinfo ci; 4154 4155 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4156 if (nlh == NULL) 4157 return -EMSGSIZE; 4158 4159 pmsg = nlmsg_data(nlh); 4160 pmsg->prefix_family = AF_INET6; 4161 pmsg->prefix_pad1 = 0; 4162 pmsg->prefix_pad2 = 0; 4163 pmsg->prefix_ifindex = idev->dev->ifindex; 4164 pmsg->prefix_len = pinfo->prefix_len; 4165 pmsg->prefix_type = pinfo->type; 4166 pmsg->prefix_pad3 = 0; 4167 pmsg->prefix_flags = 0; 4168 if (pinfo->onlink) 4169 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4170 if (pinfo->autoconf) 4171 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4172 4173 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4174 goto nla_put_failure; 4175 ci.preferred_time = ntohl(pinfo->prefered); 4176 ci.valid_time = ntohl(pinfo->valid); 4177 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4178 goto nla_put_failure; 4179 return nlmsg_end(skb, nlh); 4180 4181 nla_put_failure: 4182 nlmsg_cancel(skb, nlh); 4183 return -EMSGSIZE; 4184 } 4185 4186 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4187 struct prefix_info *pinfo) 4188 { 4189 struct sk_buff *skb; 4190 struct net *net = dev_net(idev->dev); 4191 int err = -ENOBUFS; 4192 4193 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4194 if (skb == NULL) 4195 goto errout; 4196 4197 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4198 if (err < 0) { 4199 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4200 WARN_ON(err == -EMSGSIZE); 4201 kfree_skb(skb); 4202 goto errout; 4203 } 4204 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4205 return; 4206 errout: 4207 if (err < 0) 4208 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4209 } 4210 4211 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4212 { 4213 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4214 4215 switch (event) { 4216 case RTM_NEWADDR: 4217 /* 4218 * If the address was optimistic 4219 * we inserted the route at the start of 4220 * our DAD process, so we don't need 4221 * to do it again 4222 */ 4223 if (!(ifp->rt->rt6i_node)) 4224 ip6_ins_rt(ifp->rt); 4225 if (ifp->idev->cnf.forwarding) 4226 addrconf_join_anycast(ifp); 4227 break; 4228 case RTM_DELADDR: 4229 if (ifp->idev->cnf.forwarding) 4230 addrconf_leave_anycast(ifp); 4231 addrconf_leave_solict(ifp->idev, &ifp->addr); 4232 dst_hold(&ifp->rt->dst); 4233 4234 if (ip6_del_rt(ifp->rt)) 4235 dst_free(&ifp->rt->dst); 4236 break; 4237 } 4238 } 4239 4240 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4241 { 4242 rcu_read_lock_bh(); 4243 if (likely(ifp->idev->dead == 0)) 4244 __ipv6_ifa_notify(event, ifp); 4245 rcu_read_unlock_bh(); 4246 } 4247 4248 #ifdef CONFIG_SYSCTL 4249 4250 static 4251 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4252 void __user *buffer, size_t *lenp, loff_t *ppos) 4253 { 4254 int *valp = ctl->data; 4255 int val = *valp; 4256 loff_t pos = *ppos; 4257 ctl_table lctl; 4258 int ret; 4259 4260 /* 4261 * ctl->data points to idev->cnf.forwarding, we should 4262 * not modify it until we get the rtnl lock. 4263 */ 4264 lctl = *ctl; 4265 lctl.data = &val; 4266 4267 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4268 4269 if (write) 4270 ret = addrconf_fixup_forwarding(ctl, valp, val); 4271 if (ret) 4272 *ppos = pos; 4273 return ret; 4274 } 4275 4276 static void dev_disable_change(struct inet6_dev *idev) 4277 { 4278 if (!idev || !idev->dev) 4279 return; 4280 4281 if (idev->cnf.disable_ipv6) 4282 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4283 else 4284 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4285 } 4286 4287 static void addrconf_disable_change(struct net *net, __s32 newf) 4288 { 4289 struct net_device *dev; 4290 struct inet6_dev *idev; 4291 4292 rcu_read_lock(); 4293 for_each_netdev_rcu(net, dev) { 4294 idev = __in6_dev_get(dev); 4295 if (idev) { 4296 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4297 idev->cnf.disable_ipv6 = newf; 4298 if (changed) 4299 dev_disable_change(idev); 4300 } 4301 } 4302 rcu_read_unlock(); 4303 } 4304 4305 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4306 { 4307 struct net *net; 4308 int old; 4309 4310 if (!rtnl_trylock()) 4311 return restart_syscall(); 4312 4313 net = (struct net *)table->extra2; 4314 old = *p; 4315 *p = newf; 4316 4317 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4318 rtnl_unlock(); 4319 return 0; 4320 } 4321 4322 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4323 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4324 addrconf_disable_change(net, newf); 4325 } else if ((!newf) ^ (!old)) 4326 dev_disable_change((struct inet6_dev *)table->extra1); 4327 4328 rtnl_unlock(); 4329 return 0; 4330 } 4331 4332 static 4333 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4334 void __user *buffer, size_t *lenp, loff_t *ppos) 4335 { 4336 int *valp = ctl->data; 4337 int val = *valp; 4338 loff_t pos = *ppos; 4339 ctl_table lctl; 4340 int ret; 4341 4342 /* 4343 * ctl->data points to idev->cnf.disable_ipv6, we should 4344 * not modify it until we get the rtnl lock. 4345 */ 4346 lctl = *ctl; 4347 lctl.data = &val; 4348 4349 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4350 4351 if (write) 4352 ret = addrconf_disable_ipv6(ctl, valp, val); 4353 if (ret) 4354 *ppos = pos; 4355 return ret; 4356 } 4357 4358 static struct addrconf_sysctl_table 4359 { 4360 struct ctl_table_header *sysctl_header; 4361 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4362 } addrconf_sysctl __read_mostly = { 4363 .sysctl_header = NULL, 4364 .addrconf_vars = { 4365 { 4366 .procname = "forwarding", 4367 .data = &ipv6_devconf.forwarding, 4368 .maxlen = sizeof(int), 4369 .mode = 0644, 4370 .proc_handler = addrconf_sysctl_forward, 4371 }, 4372 { 4373 .procname = "hop_limit", 4374 .data = &ipv6_devconf.hop_limit, 4375 .maxlen = sizeof(int), 4376 .mode = 0644, 4377 .proc_handler = proc_dointvec, 4378 }, 4379 { 4380 .procname = "mtu", 4381 .data = &ipv6_devconf.mtu6, 4382 .maxlen = sizeof(int), 4383 .mode = 0644, 4384 .proc_handler = proc_dointvec, 4385 }, 4386 { 4387 .procname = "accept_ra", 4388 .data = &ipv6_devconf.accept_ra, 4389 .maxlen = sizeof(int), 4390 .mode = 0644, 4391 .proc_handler = proc_dointvec, 4392 }, 4393 { 4394 .procname = "accept_redirects", 4395 .data = &ipv6_devconf.accept_redirects, 4396 .maxlen = sizeof(int), 4397 .mode = 0644, 4398 .proc_handler = proc_dointvec, 4399 }, 4400 { 4401 .procname = "autoconf", 4402 .data = &ipv6_devconf.autoconf, 4403 .maxlen = sizeof(int), 4404 .mode = 0644, 4405 .proc_handler = proc_dointvec, 4406 }, 4407 { 4408 .procname = "dad_transmits", 4409 .data = &ipv6_devconf.dad_transmits, 4410 .maxlen = sizeof(int), 4411 .mode = 0644, 4412 .proc_handler = proc_dointvec, 4413 }, 4414 { 4415 .procname = "router_solicitations", 4416 .data = &ipv6_devconf.rtr_solicits, 4417 .maxlen = sizeof(int), 4418 .mode = 0644, 4419 .proc_handler = proc_dointvec, 4420 }, 4421 { 4422 .procname = "router_solicitation_interval", 4423 .data = &ipv6_devconf.rtr_solicit_interval, 4424 .maxlen = sizeof(int), 4425 .mode = 0644, 4426 .proc_handler = proc_dointvec_jiffies, 4427 }, 4428 { 4429 .procname = "router_solicitation_delay", 4430 .data = &ipv6_devconf.rtr_solicit_delay, 4431 .maxlen = sizeof(int), 4432 .mode = 0644, 4433 .proc_handler = proc_dointvec_jiffies, 4434 }, 4435 { 4436 .procname = "force_mld_version", 4437 .data = &ipv6_devconf.force_mld_version, 4438 .maxlen = sizeof(int), 4439 .mode = 0644, 4440 .proc_handler = proc_dointvec, 4441 }, 4442 #ifdef CONFIG_IPV6_PRIVACY 4443 { 4444 .procname = "use_tempaddr", 4445 .data = &ipv6_devconf.use_tempaddr, 4446 .maxlen = sizeof(int), 4447 .mode = 0644, 4448 .proc_handler = proc_dointvec, 4449 }, 4450 { 4451 .procname = "temp_valid_lft", 4452 .data = &ipv6_devconf.temp_valid_lft, 4453 .maxlen = sizeof(int), 4454 .mode = 0644, 4455 .proc_handler = proc_dointvec, 4456 }, 4457 { 4458 .procname = "temp_prefered_lft", 4459 .data = &ipv6_devconf.temp_prefered_lft, 4460 .maxlen = sizeof(int), 4461 .mode = 0644, 4462 .proc_handler = proc_dointvec, 4463 }, 4464 { 4465 .procname = "regen_max_retry", 4466 .data = &ipv6_devconf.regen_max_retry, 4467 .maxlen = sizeof(int), 4468 .mode = 0644, 4469 .proc_handler = proc_dointvec, 4470 }, 4471 { 4472 .procname = "max_desync_factor", 4473 .data = &ipv6_devconf.max_desync_factor, 4474 .maxlen = sizeof(int), 4475 .mode = 0644, 4476 .proc_handler = proc_dointvec, 4477 }, 4478 #endif 4479 { 4480 .procname = "max_addresses", 4481 .data = &ipv6_devconf.max_addresses, 4482 .maxlen = sizeof(int), 4483 .mode = 0644, 4484 .proc_handler = proc_dointvec, 4485 }, 4486 { 4487 .procname = "accept_ra_defrtr", 4488 .data = &ipv6_devconf.accept_ra_defrtr, 4489 .maxlen = sizeof(int), 4490 .mode = 0644, 4491 .proc_handler = proc_dointvec, 4492 }, 4493 { 4494 .procname = "accept_ra_pinfo", 4495 .data = &ipv6_devconf.accept_ra_pinfo, 4496 .maxlen = sizeof(int), 4497 .mode = 0644, 4498 .proc_handler = proc_dointvec, 4499 }, 4500 #ifdef CONFIG_IPV6_ROUTER_PREF 4501 { 4502 .procname = "accept_ra_rtr_pref", 4503 .data = &ipv6_devconf.accept_ra_rtr_pref, 4504 .maxlen = sizeof(int), 4505 .mode = 0644, 4506 .proc_handler = proc_dointvec, 4507 }, 4508 { 4509 .procname = "router_probe_interval", 4510 .data = &ipv6_devconf.rtr_probe_interval, 4511 .maxlen = sizeof(int), 4512 .mode = 0644, 4513 .proc_handler = proc_dointvec_jiffies, 4514 }, 4515 #ifdef CONFIG_IPV6_ROUTE_INFO 4516 { 4517 .procname = "accept_ra_rt_info_max_plen", 4518 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4519 .maxlen = sizeof(int), 4520 .mode = 0644, 4521 .proc_handler = proc_dointvec, 4522 }, 4523 #endif 4524 #endif 4525 { 4526 .procname = "proxy_ndp", 4527 .data = &ipv6_devconf.proxy_ndp, 4528 .maxlen = sizeof(int), 4529 .mode = 0644, 4530 .proc_handler = proc_dointvec, 4531 }, 4532 { 4533 .procname = "accept_source_route", 4534 .data = &ipv6_devconf.accept_source_route, 4535 .maxlen = sizeof(int), 4536 .mode = 0644, 4537 .proc_handler = proc_dointvec, 4538 }, 4539 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4540 { 4541 .procname = "optimistic_dad", 4542 .data = &ipv6_devconf.optimistic_dad, 4543 .maxlen = sizeof(int), 4544 .mode = 0644, 4545 .proc_handler = proc_dointvec, 4546 4547 }, 4548 #endif 4549 #ifdef CONFIG_IPV6_MROUTE 4550 { 4551 .procname = "mc_forwarding", 4552 .data = &ipv6_devconf.mc_forwarding, 4553 .maxlen = sizeof(int), 4554 .mode = 0444, 4555 .proc_handler = proc_dointvec, 4556 }, 4557 #endif 4558 { 4559 .procname = "disable_ipv6", 4560 .data = &ipv6_devconf.disable_ipv6, 4561 .maxlen = sizeof(int), 4562 .mode = 0644, 4563 .proc_handler = addrconf_sysctl_disable, 4564 }, 4565 { 4566 .procname = "accept_dad", 4567 .data = &ipv6_devconf.accept_dad, 4568 .maxlen = sizeof(int), 4569 .mode = 0644, 4570 .proc_handler = proc_dointvec, 4571 }, 4572 { 4573 .procname = "force_tllao", 4574 .data = &ipv6_devconf.force_tllao, 4575 .maxlen = sizeof(int), 4576 .mode = 0644, 4577 .proc_handler = proc_dointvec 4578 }, 4579 { 4580 /* sentinel */ 4581 } 4582 }, 4583 }; 4584 4585 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4586 struct inet6_dev *idev, struct ipv6_devconf *p) 4587 { 4588 int i; 4589 struct addrconf_sysctl_table *t; 4590 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4591 4592 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4593 if (t == NULL) 4594 goto out; 4595 4596 for (i = 0; t->addrconf_vars[i].data; i++) { 4597 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4598 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4599 t->addrconf_vars[i].extra2 = net; 4600 } 4601 4602 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4603 4604 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4605 if (t->sysctl_header == NULL) 4606 goto free; 4607 4608 p->sysctl = t; 4609 return 0; 4610 4611 free: 4612 kfree(t); 4613 out: 4614 return -ENOBUFS; 4615 } 4616 4617 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4618 { 4619 struct addrconf_sysctl_table *t; 4620 4621 if (p->sysctl == NULL) 4622 return; 4623 4624 t = p->sysctl; 4625 p->sysctl = NULL; 4626 unregister_net_sysctl_table(t->sysctl_header); 4627 kfree(t); 4628 } 4629 4630 static void addrconf_sysctl_register(struct inet6_dev *idev) 4631 { 4632 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4633 &ndisc_ifinfo_sysctl_change); 4634 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4635 idev, &idev->cnf); 4636 } 4637 4638 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4639 { 4640 __addrconf_sysctl_unregister(&idev->cnf); 4641 neigh_sysctl_unregister(idev->nd_parms); 4642 } 4643 4644 4645 #endif 4646 4647 static int __net_init addrconf_init_net(struct net *net) 4648 { 4649 int err; 4650 struct ipv6_devconf *all, *dflt; 4651 4652 err = -ENOMEM; 4653 all = &ipv6_devconf; 4654 dflt = &ipv6_devconf_dflt; 4655 4656 if (!net_eq(net, &init_net)) { 4657 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4658 if (all == NULL) 4659 goto err_alloc_all; 4660 4661 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4662 if (dflt == NULL) 4663 goto err_alloc_dflt; 4664 } else { 4665 /* these will be inherited by all namespaces */ 4666 dflt->autoconf = ipv6_defaults.autoconf; 4667 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4668 } 4669 4670 net->ipv6.devconf_all = all; 4671 net->ipv6.devconf_dflt = dflt; 4672 4673 #ifdef CONFIG_SYSCTL 4674 err = __addrconf_sysctl_register(net, "all", NULL, all); 4675 if (err < 0) 4676 goto err_reg_all; 4677 4678 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4679 if (err < 0) 4680 goto err_reg_dflt; 4681 #endif 4682 return 0; 4683 4684 #ifdef CONFIG_SYSCTL 4685 err_reg_dflt: 4686 __addrconf_sysctl_unregister(all); 4687 err_reg_all: 4688 kfree(dflt); 4689 #endif 4690 err_alloc_dflt: 4691 kfree(all); 4692 err_alloc_all: 4693 return err; 4694 } 4695 4696 static void __net_exit addrconf_exit_net(struct net *net) 4697 { 4698 #ifdef CONFIG_SYSCTL 4699 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4700 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4701 #endif 4702 if (!net_eq(net, &init_net)) { 4703 kfree(net->ipv6.devconf_dflt); 4704 kfree(net->ipv6.devconf_all); 4705 } 4706 } 4707 4708 static struct pernet_operations addrconf_ops = { 4709 .init = addrconf_init_net, 4710 .exit = addrconf_exit_net, 4711 }; 4712 4713 /* 4714 * Device notifier 4715 */ 4716 4717 int register_inet6addr_notifier(struct notifier_block *nb) 4718 { 4719 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4720 } 4721 EXPORT_SYMBOL(register_inet6addr_notifier); 4722 4723 int unregister_inet6addr_notifier(struct notifier_block *nb) 4724 { 4725 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4726 } 4727 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4728 4729 static struct rtnl_af_ops inet6_ops = { 4730 .family = AF_INET6, 4731 .fill_link_af = inet6_fill_link_af, 4732 .get_link_af_size = inet6_get_link_af_size, 4733 }; 4734 4735 /* 4736 * Init / cleanup code 4737 */ 4738 4739 int __init addrconf_init(void) 4740 { 4741 int i, err; 4742 4743 err = ipv6_addr_label_init(); 4744 if (err < 0) { 4745 pr_crit("%s: cannot initialize default policy table: %d\n", 4746 __func__, err); 4747 goto out; 4748 } 4749 4750 err = register_pernet_subsys(&addrconf_ops); 4751 if (err < 0) 4752 goto out_addrlabel; 4753 4754 /* The addrconf netdev notifier requires that loopback_dev 4755 * has it's ipv6 private information allocated and setup 4756 * before it can bring up and give link-local addresses 4757 * to other devices which are up. 4758 * 4759 * Unfortunately, loopback_dev is not necessarily the first 4760 * entry in the global dev_base list of net devices. In fact, 4761 * it is likely to be the very last entry on that list. 4762 * So this causes the notifier registry below to try and 4763 * give link-local addresses to all devices besides loopback_dev 4764 * first, then loopback_dev, which cases all the non-loopback_dev 4765 * devices to fail to get a link-local address. 4766 * 4767 * So, as a temporary fix, allocate the ipv6 structure for 4768 * loopback_dev first by hand. 4769 * Longer term, all of the dependencies ipv6 has upon the loopback 4770 * device and it being up should be removed. 4771 */ 4772 rtnl_lock(); 4773 if (!ipv6_add_dev(init_net.loopback_dev)) 4774 err = -ENOMEM; 4775 rtnl_unlock(); 4776 if (err) 4777 goto errlo; 4778 4779 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4780 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4781 4782 register_netdevice_notifier(&ipv6_dev_notf); 4783 4784 addrconf_verify(0); 4785 4786 err = rtnl_af_register(&inet6_ops); 4787 if (err < 0) 4788 goto errout_af; 4789 4790 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4791 NULL); 4792 if (err < 0) 4793 goto errout; 4794 4795 /* Only the first call to __rtnl_register can fail */ 4796 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4797 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4798 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4799 inet6_dump_ifaddr, NULL); 4800 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4801 inet6_dump_ifmcaddr, NULL); 4802 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4803 inet6_dump_ifacaddr, NULL); 4804 4805 ipv6_addr_label_rtnl_register(); 4806 4807 return 0; 4808 errout: 4809 rtnl_af_unregister(&inet6_ops); 4810 errout_af: 4811 unregister_netdevice_notifier(&ipv6_dev_notf); 4812 errlo: 4813 unregister_pernet_subsys(&addrconf_ops); 4814 out_addrlabel: 4815 ipv6_addr_label_cleanup(); 4816 out: 4817 return err; 4818 } 4819 4820 void addrconf_cleanup(void) 4821 { 4822 struct net_device *dev; 4823 int i; 4824 4825 unregister_netdevice_notifier(&ipv6_dev_notf); 4826 unregister_pernet_subsys(&addrconf_ops); 4827 ipv6_addr_label_cleanup(); 4828 4829 rtnl_lock(); 4830 4831 __rtnl_af_unregister(&inet6_ops); 4832 4833 /* clean dev list */ 4834 for_each_netdev(&init_net, dev) { 4835 if (__in6_dev_get(dev) == NULL) 4836 continue; 4837 addrconf_ifdown(dev, 1); 4838 } 4839 addrconf_ifdown(init_net.loopback_dev, 2); 4840 4841 /* 4842 * Check hash table. 4843 */ 4844 spin_lock_bh(&addrconf_hash_lock); 4845 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4846 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4847 spin_unlock_bh(&addrconf_hash_lock); 4848 4849 del_timer(&addr_chk_timer); 4850 rtnl_unlock(); 4851 } 4852