1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #include <linux/errno.h> 42 #include <linux/types.h> 43 #include <linux/kernel.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <linux/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 91 /* Set to 3 to get tracing... */ 92 #define ACONF_DEBUG 2 93 94 #if ACONF_DEBUG >= 3 95 #define ADBG(x) printk x 96 #else 97 #define ADBG(x) 98 #endif 99 100 #define INFINITY_LIFE_TIME 0xFFFFFFFF 101 #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b))) 102 103 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 104 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 105 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 106 107 #ifdef CONFIG_SYSCTL 108 static void addrconf_sysctl_register(struct inet6_dev *idev); 109 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 110 #else 111 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 112 { 113 } 114 115 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 116 { 117 } 118 #endif 119 120 #ifdef CONFIG_IPV6_PRIVACY 121 static int __ipv6_regen_rndid(struct inet6_dev *idev); 122 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 123 static void ipv6_regen_rndid(unsigned long data); 124 #endif 125 126 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 127 static int ipv6_count_addresses(struct inet6_dev *idev); 128 129 /* 130 * Configured unicast address hash table 131 */ 132 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 133 static DEFINE_SPINLOCK(addrconf_hash_lock); 134 135 static void addrconf_verify(unsigned long); 136 137 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 138 static DEFINE_SPINLOCK(addrconf_verify_lock); 139 140 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 141 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 142 143 static void addrconf_type_change(struct net_device *dev, 144 unsigned long event); 145 static int addrconf_ifdown(struct net_device *dev, int how); 146 147 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 148 static void addrconf_dad_timer(unsigned long data); 149 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 150 static void addrconf_dad_run(struct inet6_dev *idev); 151 static void addrconf_rs_timer(unsigned long data); 152 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 153 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 154 155 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 156 struct prefix_info *pinfo); 157 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 158 struct net_device *dev); 159 160 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 161 162 static struct ipv6_devconf ipv6_devconf __read_mostly = { 163 .forwarding = 0, 164 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 165 .mtu6 = IPV6_MIN_MTU, 166 .accept_ra = 1, 167 .accept_redirects = 1, 168 .autoconf = 1, 169 .force_mld_version = 0, 170 .dad_transmits = 1, 171 .rtr_solicits = MAX_RTR_SOLICITATIONS, 172 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 173 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 174 #ifdef CONFIG_IPV6_PRIVACY 175 .use_tempaddr = 0, 176 .temp_valid_lft = TEMP_VALID_LIFETIME, 177 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 178 .regen_max_retry = REGEN_MAX_RETRY, 179 .max_desync_factor = MAX_DESYNC_FACTOR, 180 #endif 181 .max_addresses = IPV6_MAX_ADDRESSES, 182 .accept_ra_defrtr = 1, 183 .accept_ra_pinfo = 1, 184 #ifdef CONFIG_IPV6_ROUTER_PREF 185 .accept_ra_rtr_pref = 1, 186 .rtr_probe_interval = 60 * HZ, 187 #ifdef CONFIG_IPV6_ROUTE_INFO 188 .accept_ra_rt_info_max_plen = 0, 189 #endif 190 #endif 191 .proxy_ndp = 0, 192 .accept_source_route = 0, /* we do not accept RH0 by default. */ 193 .disable_ipv6 = 0, 194 .accept_dad = 1, 195 }; 196 197 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 198 .forwarding = 0, 199 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 200 .mtu6 = IPV6_MIN_MTU, 201 .accept_ra = 1, 202 .accept_redirects = 1, 203 .autoconf = 1, 204 .dad_transmits = 1, 205 .rtr_solicits = MAX_RTR_SOLICITATIONS, 206 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 207 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 208 #ifdef CONFIG_IPV6_PRIVACY 209 .use_tempaddr = 0, 210 .temp_valid_lft = TEMP_VALID_LIFETIME, 211 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 212 .regen_max_retry = REGEN_MAX_RETRY, 213 .max_desync_factor = MAX_DESYNC_FACTOR, 214 #endif 215 .max_addresses = IPV6_MAX_ADDRESSES, 216 .accept_ra_defrtr = 1, 217 .accept_ra_pinfo = 1, 218 #ifdef CONFIG_IPV6_ROUTER_PREF 219 .accept_ra_rtr_pref = 1, 220 .rtr_probe_interval = 60 * HZ, 221 #ifdef CONFIG_IPV6_ROUTE_INFO 222 .accept_ra_rt_info_max_plen = 0, 223 #endif 224 #endif 225 .proxy_ndp = 0, 226 .accept_source_route = 0, /* we do not accept RH0 by default. */ 227 .disable_ipv6 = 0, 228 .accept_dad = 1, 229 }; 230 231 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 232 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 233 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 234 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 235 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 236 237 /* Check if a valid qdisc is available */ 238 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 239 { 240 return !qdisc_tx_is_noop(dev); 241 } 242 243 /* Check if a route is valid prefix route */ 244 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 245 { 246 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0); 247 } 248 249 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 250 { 251 if (del_timer(&ifp->timer)) 252 __in6_ifa_put(ifp); 253 } 254 255 enum addrconf_timer_t { 256 AC_NONE, 257 AC_DAD, 258 AC_RS, 259 }; 260 261 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 262 enum addrconf_timer_t what, 263 unsigned long when) 264 { 265 if (!del_timer(&ifp->timer)) 266 in6_ifa_hold(ifp); 267 268 switch (what) { 269 case AC_DAD: 270 ifp->timer.function = addrconf_dad_timer; 271 break; 272 case AC_RS: 273 ifp->timer.function = addrconf_rs_timer; 274 break; 275 default: 276 break; 277 } 278 ifp->timer.expires = jiffies + when; 279 add_timer(&ifp->timer); 280 } 281 282 static int snmp6_alloc_dev(struct inet6_dev *idev) 283 { 284 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 285 sizeof(struct ipstats_mib), 286 __alignof__(struct ipstats_mib)) < 0) 287 goto err_ip; 288 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6, 289 sizeof(struct icmpv6_mib), 290 __alignof__(struct icmpv6_mib)) < 0) 291 goto err_icmp; 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg, 293 sizeof(struct icmpv6msg_mib), 294 __alignof__(struct icmpv6msg_mib)) < 0) 295 goto err_icmpmsg; 296 297 return 0; 298 299 err_icmpmsg: 300 snmp_mib_free((void __percpu **)idev->stats.icmpv6); 301 err_icmp: 302 snmp_mib_free((void __percpu **)idev->stats.ipv6); 303 err_ip: 304 return -ENOMEM; 305 } 306 307 static void snmp6_free_dev(struct inet6_dev *idev) 308 { 309 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg); 310 snmp_mib_free((void __percpu **)idev->stats.icmpv6); 311 snmp_mib_free((void __percpu **)idev->stats.ipv6); 312 } 313 314 /* Nobody refers to this device, we may destroy it. */ 315 316 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 317 { 318 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 319 kfree(idev); 320 } 321 322 void in6_dev_finish_destroy(struct inet6_dev *idev) 323 { 324 struct net_device *dev = idev->dev; 325 326 WARN_ON(!list_empty(&idev->addr_list)); 327 WARN_ON(idev->mc_list != NULL); 328 329 #ifdef NET_REFCNT_DEBUG 330 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 331 #endif 332 dev_put(dev); 333 if (!idev->dead) { 334 pr_warning("Freeing alive inet6 device %p\n", idev); 335 return; 336 } 337 snmp6_free_dev(idev); 338 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 339 } 340 341 EXPORT_SYMBOL(in6_dev_finish_destroy); 342 343 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 344 { 345 struct inet6_dev *ndev; 346 347 ASSERT_RTNL(); 348 349 if (dev->mtu < IPV6_MIN_MTU) 350 return NULL; 351 352 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 353 354 if (ndev == NULL) 355 return NULL; 356 357 rwlock_init(&ndev->lock); 358 ndev->dev = dev; 359 INIT_LIST_HEAD(&ndev->addr_list); 360 361 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 362 ndev->cnf.mtu6 = dev->mtu; 363 ndev->cnf.sysctl = NULL; 364 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 365 if (ndev->nd_parms == NULL) { 366 kfree(ndev); 367 return NULL; 368 } 369 if (ndev->cnf.forwarding) 370 dev_disable_lro(dev); 371 /* We refer to the device */ 372 dev_hold(dev); 373 374 if (snmp6_alloc_dev(ndev) < 0) { 375 ADBG((KERN_WARNING 376 "%s(): cannot allocate memory for statistics; dev=%s.\n", 377 __func__, dev->name)); 378 neigh_parms_release(&nd_tbl, ndev->nd_parms); 379 ndev->dead = 1; 380 in6_dev_finish_destroy(ndev); 381 return NULL; 382 } 383 384 if (snmp6_register_dev(ndev) < 0) { 385 ADBG((KERN_WARNING 386 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 387 __func__, dev->name)); 388 neigh_parms_release(&nd_tbl, ndev->nd_parms); 389 ndev->dead = 1; 390 in6_dev_finish_destroy(ndev); 391 return NULL; 392 } 393 394 /* One reference from device. We must do this before 395 * we invoke __ipv6_regen_rndid(). 396 */ 397 in6_dev_hold(ndev); 398 399 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 400 ndev->cnf.accept_dad = -1; 401 402 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 403 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 404 printk(KERN_INFO 405 "%s: Disabled Multicast RS\n", 406 dev->name); 407 ndev->cnf.rtr_solicits = 0; 408 } 409 #endif 410 411 #ifdef CONFIG_IPV6_PRIVACY 412 INIT_LIST_HEAD(&ndev->tempaddr_list); 413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 414 if ((dev->flags&IFF_LOOPBACK) || 415 dev->type == ARPHRD_TUNNEL || 416 dev->type == ARPHRD_TUNNEL6 || 417 dev->type == ARPHRD_SIT || 418 dev->type == ARPHRD_NONE) { 419 printk(KERN_INFO 420 "%s: Disabled Privacy Extensions\n", 421 dev->name); 422 ndev->cnf.use_tempaddr = -1; 423 } else { 424 in6_dev_hold(ndev); 425 ipv6_regen_rndid((unsigned long) ndev); 426 } 427 #endif 428 429 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 430 ndev->if_flags |= IF_READY; 431 432 ipv6_mc_init_dev(ndev); 433 ndev->tstamp = jiffies; 434 addrconf_sysctl_register(ndev); 435 /* protected by rtnl_lock */ 436 rcu_assign_pointer(dev->ip6_ptr, ndev); 437 438 /* Join all-node multicast group */ 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 440 441 return ndev; 442 } 443 444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 445 { 446 struct inet6_dev *idev; 447 448 ASSERT_RTNL(); 449 450 idev = __in6_dev_get(dev); 451 if (!idev) { 452 idev = ipv6_add_dev(dev); 453 if (!idev) 454 return NULL; 455 } 456 457 if (dev->flags&IFF_UP) 458 ipv6_mc_up(idev); 459 return idev; 460 } 461 462 #ifdef CONFIG_SYSCTL 463 static void dev_forward_change(struct inet6_dev *idev) 464 { 465 struct net_device *dev; 466 struct inet6_ifaddr *ifa; 467 468 if (!idev) 469 return; 470 dev = idev->dev; 471 if (idev->cnf.forwarding) 472 dev_disable_lro(dev); 473 if (dev && (dev->flags & IFF_MULTICAST)) { 474 if (idev->cnf.forwarding) 475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 476 else 477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 478 } 479 480 list_for_each_entry(ifa, &idev->addr_list, if_list) { 481 if (ifa->flags&IFA_F_TENTATIVE) 482 continue; 483 if (idev->cnf.forwarding) 484 addrconf_join_anycast(ifa); 485 else 486 addrconf_leave_anycast(ifa); 487 } 488 } 489 490 491 static void addrconf_forward_change(struct net *net, __s32 newf) 492 { 493 struct net_device *dev; 494 struct inet6_dev *idev; 495 496 rcu_read_lock(); 497 for_each_netdev_rcu(net, dev) { 498 idev = __in6_dev_get(dev); 499 if (idev) { 500 int changed = (!idev->cnf.forwarding) ^ (!newf); 501 idev->cnf.forwarding = newf; 502 if (changed) 503 dev_forward_change(idev); 504 } 505 } 506 rcu_read_unlock(); 507 } 508 509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 510 { 511 struct net *net; 512 513 net = (struct net *)table->extra2; 514 if (p == &net->ipv6.devconf_dflt->forwarding) 515 return 0; 516 517 if (!rtnl_trylock()) { 518 /* Restore the original values before restarting */ 519 *p = old; 520 return restart_syscall(); 521 } 522 523 if (p == &net->ipv6.devconf_all->forwarding) { 524 __s32 newf = net->ipv6.devconf_all->forwarding; 525 net->ipv6.devconf_dflt->forwarding = newf; 526 addrconf_forward_change(net, newf); 527 } else if ((!*p) ^ (!old)) 528 dev_forward_change((struct inet6_dev *)table->extra1); 529 rtnl_unlock(); 530 531 if (*p) 532 rt6_purge_dflt_routers(net); 533 return 1; 534 } 535 #endif 536 537 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head) 538 { 539 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu); 540 kfree(ifp); 541 } 542 543 /* Nobody refers to this ifaddr, destroy it */ 544 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 545 { 546 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 547 548 #ifdef NET_REFCNT_DEBUG 549 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 550 #endif 551 552 in6_dev_put(ifp->idev); 553 554 if (del_timer(&ifp->timer)) 555 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 556 557 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 558 pr_warning("Freeing alive inet6 address %p\n", ifp); 559 return; 560 } 561 dst_release(&ifp->rt->dst); 562 563 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu); 564 } 565 566 static void 567 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 568 { 569 struct list_head *p; 570 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 571 572 /* 573 * Each device address list is sorted in order of scope - 574 * global before linklocal. 575 */ 576 list_for_each(p, &idev->addr_list) { 577 struct inet6_ifaddr *ifa 578 = list_entry(p, struct inet6_ifaddr, if_list); 579 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 580 break; 581 } 582 583 list_add_tail(&ifp->if_list, p); 584 } 585 586 static u32 ipv6_addr_hash(const struct in6_addr *addr) 587 { 588 /* 589 * We perform the hash function over the last 64 bits of the address 590 * This will include the IEEE address token on links that support it. 591 */ 592 return jhash_2words((__force u32)addr->s6_addr32[2], 593 (__force u32)addr->s6_addr32[3], 0) 594 & (IN6_ADDR_HSIZE - 1); 595 } 596 597 /* On success it returns ifp with increased reference count */ 598 599 static struct inet6_ifaddr * 600 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 601 int scope, u32 flags) 602 { 603 struct inet6_ifaddr *ifa = NULL; 604 struct rt6_info *rt; 605 unsigned int hash; 606 int err = 0; 607 int addr_type = ipv6_addr_type(addr); 608 609 if (addr_type == IPV6_ADDR_ANY || 610 addr_type & IPV6_ADDR_MULTICAST || 611 (!(idev->dev->flags & IFF_LOOPBACK) && 612 addr_type & IPV6_ADDR_LOOPBACK)) 613 return ERR_PTR(-EADDRNOTAVAIL); 614 615 rcu_read_lock_bh(); 616 if (idev->dead) { 617 err = -ENODEV; /*XXX*/ 618 goto out2; 619 } 620 621 if (idev->cnf.disable_ipv6) { 622 err = -EACCES; 623 goto out2; 624 } 625 626 spin_lock(&addrconf_hash_lock); 627 628 /* Ignore adding duplicate addresses on an interface */ 629 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 630 ADBG(("ipv6_add_addr: already assigned\n")); 631 err = -EEXIST; 632 goto out; 633 } 634 635 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 636 637 if (ifa == NULL) { 638 ADBG(("ipv6_add_addr: malloc failed\n")); 639 err = -ENOBUFS; 640 goto out; 641 } 642 643 rt = addrconf_dst_alloc(idev, addr, 0); 644 if (IS_ERR(rt)) { 645 err = PTR_ERR(rt); 646 goto out; 647 } 648 649 ipv6_addr_copy(&ifa->addr, addr); 650 651 spin_lock_init(&ifa->lock); 652 spin_lock_init(&ifa->state_lock); 653 init_timer(&ifa->timer); 654 INIT_HLIST_NODE(&ifa->addr_lst); 655 ifa->timer.data = (unsigned long) ifa; 656 ifa->scope = scope; 657 ifa->prefix_len = pfxlen; 658 ifa->flags = flags | IFA_F_TENTATIVE; 659 ifa->cstamp = ifa->tstamp = jiffies; 660 661 ifa->rt = rt; 662 663 /* 664 * part one of RFC 4429, section 3.3 665 * We should not configure an address as 666 * optimistic if we do not yet know the link 667 * layer address of our nexhop router 668 */ 669 670 if (rt->rt6i_nexthop == NULL) 671 ifa->flags &= ~IFA_F_OPTIMISTIC; 672 673 ifa->idev = idev; 674 in6_dev_hold(idev); 675 /* For caller */ 676 in6_ifa_hold(ifa); 677 678 /* Add to big hash table */ 679 hash = ipv6_addr_hash(addr); 680 681 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 682 spin_unlock(&addrconf_hash_lock); 683 684 write_lock(&idev->lock); 685 /* Add to inet6_dev unicast addr list. */ 686 ipv6_link_dev_addr(idev, ifa); 687 688 #ifdef CONFIG_IPV6_PRIVACY 689 if (ifa->flags&IFA_F_TEMPORARY) { 690 list_add(&ifa->tmp_list, &idev->tempaddr_list); 691 in6_ifa_hold(ifa); 692 } 693 #endif 694 695 in6_ifa_hold(ifa); 696 write_unlock(&idev->lock); 697 out2: 698 rcu_read_unlock_bh(); 699 700 if (likely(err == 0)) 701 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 702 else { 703 kfree(ifa); 704 ifa = ERR_PTR(err); 705 } 706 707 return ifa; 708 out: 709 spin_unlock(&addrconf_hash_lock); 710 goto out2; 711 } 712 713 /* This function wants to get referenced ifp and releases it before return */ 714 715 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 716 { 717 struct inet6_ifaddr *ifa, *ifn; 718 struct inet6_dev *idev = ifp->idev; 719 int state; 720 int hash; 721 int deleted = 0, onlink = 0; 722 unsigned long expires = jiffies; 723 724 hash = ipv6_addr_hash(&ifp->addr); 725 726 spin_lock_bh(&ifp->state_lock); 727 state = ifp->state; 728 ifp->state = INET6_IFADDR_STATE_DEAD; 729 spin_unlock_bh(&ifp->state_lock); 730 731 if (state == INET6_IFADDR_STATE_DEAD) 732 goto out; 733 734 spin_lock_bh(&addrconf_hash_lock); 735 hlist_del_init_rcu(&ifp->addr_lst); 736 spin_unlock_bh(&addrconf_hash_lock); 737 738 write_lock_bh(&idev->lock); 739 #ifdef CONFIG_IPV6_PRIVACY 740 if (ifp->flags&IFA_F_TEMPORARY) { 741 list_del(&ifp->tmp_list); 742 if (ifp->ifpub) { 743 in6_ifa_put(ifp->ifpub); 744 ifp->ifpub = NULL; 745 } 746 __in6_ifa_put(ifp); 747 } 748 #endif 749 750 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 751 if (ifa == ifp) { 752 list_del_init(&ifp->if_list); 753 __in6_ifa_put(ifp); 754 755 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 756 break; 757 deleted = 1; 758 continue; 759 } else if (ifp->flags & IFA_F_PERMANENT) { 760 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 761 ifp->prefix_len)) { 762 if (ifa->flags & IFA_F_PERMANENT) { 763 onlink = 1; 764 if (deleted) 765 break; 766 } else { 767 unsigned long lifetime; 768 769 if (!onlink) 770 onlink = -1; 771 772 spin_lock(&ifa->lock); 773 774 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 775 /* 776 * Note: Because this address is 777 * not permanent, lifetime < 778 * LONG_MAX / HZ here. 779 */ 780 if (time_before(expires, 781 ifa->tstamp + lifetime * HZ)) 782 expires = ifa->tstamp + lifetime * HZ; 783 spin_unlock(&ifa->lock); 784 } 785 } 786 } 787 } 788 write_unlock_bh(&idev->lock); 789 790 addrconf_del_timer(ifp); 791 792 ipv6_ifa_notify(RTM_DELADDR, ifp); 793 794 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 795 796 /* 797 * Purge or update corresponding prefix 798 * 799 * 1) we don't purge prefix here if address was not permanent. 800 * prefix is managed by its own lifetime. 801 * 2) if there're no addresses, delete prefix. 802 * 3) if there're still other permanent address(es), 803 * corresponding prefix is still permanent. 804 * 4) otherwise, update prefix lifetime to the 805 * longest valid lifetime among the corresponding 806 * addresses on the device. 807 * Note: subsequent RA will update lifetime. 808 * 809 * --yoshfuji 810 */ 811 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 812 struct in6_addr prefix; 813 struct rt6_info *rt; 814 struct net *net = dev_net(ifp->idev->dev); 815 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 816 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 817 818 if (rt && addrconf_is_prefix_route(rt)) { 819 if (onlink == 0) { 820 ip6_del_rt(rt); 821 rt = NULL; 822 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 823 rt->rt6i_expires = expires; 824 rt->rt6i_flags |= RTF_EXPIRES; 825 } 826 } 827 dst_release(&rt->dst); 828 } 829 830 out: 831 in6_ifa_put(ifp); 832 } 833 834 #ifdef CONFIG_IPV6_PRIVACY 835 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 836 { 837 struct inet6_dev *idev = ifp->idev; 838 struct in6_addr addr, *tmpaddr; 839 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 840 unsigned long regen_advance; 841 int tmp_plen; 842 int ret = 0; 843 int max_addresses; 844 u32 addr_flags; 845 846 write_lock(&idev->lock); 847 if (ift) { 848 spin_lock_bh(&ift->lock); 849 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 850 spin_unlock_bh(&ift->lock); 851 tmpaddr = &addr; 852 } else { 853 tmpaddr = NULL; 854 } 855 retry: 856 in6_dev_hold(idev); 857 if (idev->cnf.use_tempaddr <= 0) { 858 write_unlock(&idev->lock); 859 printk(KERN_INFO 860 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 861 in6_dev_put(idev); 862 ret = -1; 863 goto out; 864 } 865 spin_lock_bh(&ifp->lock); 866 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 867 idev->cnf.use_tempaddr = -1; /*XXX*/ 868 spin_unlock_bh(&ifp->lock); 869 write_unlock(&idev->lock); 870 printk(KERN_WARNING 871 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 872 in6_dev_put(idev); 873 ret = -1; 874 goto out; 875 } 876 in6_ifa_hold(ifp); 877 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 878 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 879 spin_unlock_bh(&ifp->lock); 880 write_unlock(&idev->lock); 881 printk(KERN_WARNING 882 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 883 in6_ifa_put(ifp); 884 in6_dev_put(idev); 885 ret = -1; 886 goto out; 887 } 888 memcpy(&addr.s6_addr[8], idev->rndid, 8); 889 tmp_valid_lft = min_t(__u32, 890 ifp->valid_lft, 891 idev->cnf.temp_valid_lft); 892 tmp_prefered_lft = min_t(__u32, 893 ifp->prefered_lft, 894 idev->cnf.temp_prefered_lft - 895 idev->cnf.max_desync_factor); 896 tmp_plen = ifp->prefix_len; 897 max_addresses = idev->cnf.max_addresses; 898 tmp_cstamp = ifp->cstamp; 899 tmp_tstamp = ifp->tstamp; 900 spin_unlock_bh(&ifp->lock); 901 902 regen_advance = idev->cnf.regen_max_retry * 903 idev->cnf.dad_transmits * 904 idev->nd_parms->retrans_time / HZ; 905 write_unlock(&idev->lock); 906 907 /* A temporary address is created only if this calculated Preferred 908 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 909 * an implementation must not create a temporary address with a zero 910 * Preferred Lifetime. 911 */ 912 if (tmp_prefered_lft <= regen_advance) { 913 in6_ifa_put(ifp); 914 in6_dev_put(idev); 915 ret = -1; 916 goto out; 917 } 918 919 addr_flags = IFA_F_TEMPORARY; 920 /* set in addrconf_prefix_rcv() */ 921 if (ifp->flags & IFA_F_OPTIMISTIC) 922 addr_flags |= IFA_F_OPTIMISTIC; 923 924 ift = !max_addresses || 925 ipv6_count_addresses(idev) < max_addresses ? 926 ipv6_add_addr(idev, &addr, tmp_plen, 927 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 928 addr_flags) : NULL; 929 if (!ift || IS_ERR(ift)) { 930 in6_ifa_put(ifp); 931 in6_dev_put(idev); 932 printk(KERN_INFO 933 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 934 tmpaddr = &addr; 935 write_lock(&idev->lock); 936 goto retry; 937 } 938 939 spin_lock_bh(&ift->lock); 940 ift->ifpub = ifp; 941 ift->valid_lft = tmp_valid_lft; 942 ift->prefered_lft = tmp_prefered_lft; 943 ift->cstamp = tmp_cstamp; 944 ift->tstamp = tmp_tstamp; 945 spin_unlock_bh(&ift->lock); 946 947 addrconf_dad_start(ift, 0); 948 in6_ifa_put(ift); 949 in6_dev_put(idev); 950 out: 951 return ret; 952 } 953 #endif 954 955 /* 956 * Choose an appropriate source address (RFC3484) 957 */ 958 enum { 959 IPV6_SADDR_RULE_INIT = 0, 960 IPV6_SADDR_RULE_LOCAL, 961 IPV6_SADDR_RULE_SCOPE, 962 IPV6_SADDR_RULE_PREFERRED, 963 #ifdef CONFIG_IPV6_MIP6 964 IPV6_SADDR_RULE_HOA, 965 #endif 966 IPV6_SADDR_RULE_OIF, 967 IPV6_SADDR_RULE_LABEL, 968 #ifdef CONFIG_IPV6_PRIVACY 969 IPV6_SADDR_RULE_PRIVACY, 970 #endif 971 IPV6_SADDR_RULE_ORCHID, 972 IPV6_SADDR_RULE_PREFIX, 973 IPV6_SADDR_RULE_MAX 974 }; 975 976 struct ipv6_saddr_score { 977 int rule; 978 int addr_type; 979 struct inet6_ifaddr *ifa; 980 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 981 int scopedist; 982 int matchlen; 983 }; 984 985 struct ipv6_saddr_dst { 986 const struct in6_addr *addr; 987 int ifindex; 988 int scope; 989 int label; 990 unsigned int prefs; 991 }; 992 993 static inline int ipv6_saddr_preferred(int type) 994 { 995 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 996 return 1; 997 return 0; 998 } 999 1000 static int ipv6_get_saddr_eval(struct net *net, 1001 struct ipv6_saddr_score *score, 1002 struct ipv6_saddr_dst *dst, 1003 int i) 1004 { 1005 int ret; 1006 1007 if (i <= score->rule) { 1008 switch (i) { 1009 case IPV6_SADDR_RULE_SCOPE: 1010 ret = score->scopedist; 1011 break; 1012 case IPV6_SADDR_RULE_PREFIX: 1013 ret = score->matchlen; 1014 break; 1015 default: 1016 ret = !!test_bit(i, score->scorebits); 1017 } 1018 goto out; 1019 } 1020 1021 switch (i) { 1022 case IPV6_SADDR_RULE_INIT: 1023 /* Rule 0: remember if hiscore is not ready yet */ 1024 ret = !!score->ifa; 1025 break; 1026 case IPV6_SADDR_RULE_LOCAL: 1027 /* Rule 1: Prefer same address */ 1028 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1029 break; 1030 case IPV6_SADDR_RULE_SCOPE: 1031 /* Rule 2: Prefer appropriate scope 1032 * 1033 * ret 1034 * ^ 1035 * -1 | d 15 1036 * ---+--+-+---> scope 1037 * | 1038 * | d is scope of the destination. 1039 * B-d | \ 1040 * | \ <- smaller scope is better if 1041 * B-15 | \ if scope is enough for destinaion. 1042 * | ret = B - scope (-1 <= scope >= d <= 15). 1043 * d-C-1 | / 1044 * |/ <- greater is better 1045 * -C / if scope is not enough for destination. 1046 * /| ret = scope - C (-1 <= d < scope <= 15). 1047 * 1048 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1049 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1050 * Assume B = 0 and we get C > 29. 1051 */ 1052 ret = __ipv6_addr_src_scope(score->addr_type); 1053 if (ret >= dst->scope) 1054 ret = -ret; 1055 else 1056 ret -= 128; /* 30 is enough */ 1057 score->scopedist = ret; 1058 break; 1059 case IPV6_SADDR_RULE_PREFERRED: 1060 /* Rule 3: Avoid deprecated and optimistic addresses */ 1061 ret = ipv6_saddr_preferred(score->addr_type) || 1062 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1063 break; 1064 #ifdef CONFIG_IPV6_MIP6 1065 case IPV6_SADDR_RULE_HOA: 1066 { 1067 /* Rule 4: Prefer home address */ 1068 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1069 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1070 break; 1071 } 1072 #endif 1073 case IPV6_SADDR_RULE_OIF: 1074 /* Rule 5: Prefer outgoing interface */ 1075 ret = (!dst->ifindex || 1076 dst->ifindex == score->ifa->idev->dev->ifindex); 1077 break; 1078 case IPV6_SADDR_RULE_LABEL: 1079 /* Rule 6: Prefer matching label */ 1080 ret = ipv6_addr_label(net, 1081 &score->ifa->addr, score->addr_type, 1082 score->ifa->idev->dev->ifindex) == dst->label; 1083 break; 1084 #ifdef CONFIG_IPV6_PRIVACY 1085 case IPV6_SADDR_RULE_PRIVACY: 1086 { 1087 /* Rule 7: Prefer public address 1088 * Note: prefer temprary address if use_tempaddr >= 2 1089 */ 1090 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1091 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1092 score->ifa->idev->cnf.use_tempaddr >= 2; 1093 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1094 break; 1095 } 1096 #endif 1097 case IPV6_SADDR_RULE_ORCHID: 1098 /* Rule 8-: Prefer ORCHID vs ORCHID or 1099 * non-ORCHID vs non-ORCHID 1100 */ 1101 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1102 ipv6_addr_orchid(dst->addr)); 1103 break; 1104 case IPV6_SADDR_RULE_PREFIX: 1105 /* Rule 8: Use longest matching prefix */ 1106 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1107 dst->addr); 1108 break; 1109 default: 1110 ret = 0; 1111 } 1112 1113 if (ret) 1114 __set_bit(i, score->scorebits); 1115 score->rule = i; 1116 out: 1117 return ret; 1118 } 1119 1120 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1121 const struct in6_addr *daddr, unsigned int prefs, 1122 struct in6_addr *saddr) 1123 { 1124 struct ipv6_saddr_score scores[2], 1125 *score = &scores[0], *hiscore = &scores[1]; 1126 struct ipv6_saddr_dst dst; 1127 struct net_device *dev; 1128 int dst_type; 1129 1130 dst_type = __ipv6_addr_type(daddr); 1131 dst.addr = daddr; 1132 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1133 dst.scope = __ipv6_addr_src_scope(dst_type); 1134 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1135 dst.prefs = prefs; 1136 1137 hiscore->rule = -1; 1138 hiscore->ifa = NULL; 1139 1140 rcu_read_lock(); 1141 1142 for_each_netdev_rcu(net, dev) { 1143 struct inet6_dev *idev; 1144 1145 /* Candidate Source Address (section 4) 1146 * - multicast and link-local destination address, 1147 * the set of candidate source address MUST only 1148 * include addresses assigned to interfaces 1149 * belonging to the same link as the outgoing 1150 * interface. 1151 * (- For site-local destination addresses, the 1152 * set of candidate source addresses MUST only 1153 * include addresses assigned to interfaces 1154 * belonging to the same site as the outgoing 1155 * interface.) 1156 */ 1157 if (((dst_type & IPV6_ADDR_MULTICAST) || 1158 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1159 dst.ifindex && dev->ifindex != dst.ifindex) 1160 continue; 1161 1162 idev = __in6_dev_get(dev); 1163 if (!idev) 1164 continue; 1165 1166 read_lock_bh(&idev->lock); 1167 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1168 int i; 1169 1170 /* 1171 * - Tentative Address (RFC2462 section 5.4) 1172 * - A tentative address is not considered 1173 * "assigned to an interface" in the traditional 1174 * sense, unless it is also flagged as optimistic. 1175 * - Candidate Source Address (section 4) 1176 * - In any case, anycast addresses, multicast 1177 * addresses, and the unspecified address MUST 1178 * NOT be included in a candidate set. 1179 */ 1180 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1181 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1182 continue; 1183 1184 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1185 1186 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1187 score->addr_type & IPV6_ADDR_MULTICAST)) { 1188 LIMIT_NETDEBUG(KERN_DEBUG 1189 "ADDRCONF: unspecified / multicast address " 1190 "assigned as unicast address on %s", 1191 dev->name); 1192 continue; 1193 } 1194 1195 score->rule = -1; 1196 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1197 1198 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1199 int minihiscore, miniscore; 1200 1201 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1202 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1203 1204 if (minihiscore > miniscore) { 1205 if (i == IPV6_SADDR_RULE_SCOPE && 1206 score->scopedist > 0) { 1207 /* 1208 * special case: 1209 * each remaining entry 1210 * has too small (not enough) 1211 * scope, because ifa entries 1212 * are sorted by their scope 1213 * values. 1214 */ 1215 goto try_nextdev; 1216 } 1217 break; 1218 } else if (minihiscore < miniscore) { 1219 if (hiscore->ifa) 1220 in6_ifa_put(hiscore->ifa); 1221 1222 in6_ifa_hold(score->ifa); 1223 1224 swap(hiscore, score); 1225 1226 /* restore our iterator */ 1227 score->ifa = hiscore->ifa; 1228 1229 break; 1230 } 1231 } 1232 } 1233 try_nextdev: 1234 read_unlock_bh(&idev->lock); 1235 } 1236 rcu_read_unlock(); 1237 1238 if (!hiscore->ifa) 1239 return -EADDRNOTAVAIL; 1240 1241 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1242 in6_ifa_put(hiscore->ifa); 1243 return 0; 1244 } 1245 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1246 1247 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1248 unsigned char banned_flags) 1249 { 1250 struct inet6_dev *idev; 1251 int err = -EADDRNOTAVAIL; 1252 1253 rcu_read_lock(); 1254 idev = __in6_dev_get(dev); 1255 if (idev) { 1256 struct inet6_ifaddr *ifp; 1257 1258 read_lock_bh(&idev->lock); 1259 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1260 if (ifp->scope == IFA_LINK && 1261 !(ifp->flags & banned_flags)) { 1262 ipv6_addr_copy(addr, &ifp->addr); 1263 err = 0; 1264 break; 1265 } 1266 } 1267 read_unlock_bh(&idev->lock); 1268 } 1269 rcu_read_unlock(); 1270 return err; 1271 } 1272 1273 static int ipv6_count_addresses(struct inet6_dev *idev) 1274 { 1275 int cnt = 0; 1276 struct inet6_ifaddr *ifp; 1277 1278 read_lock_bh(&idev->lock); 1279 list_for_each_entry(ifp, &idev->addr_list, if_list) 1280 cnt++; 1281 read_unlock_bh(&idev->lock); 1282 return cnt; 1283 } 1284 1285 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1286 struct net_device *dev, int strict) 1287 { 1288 struct inet6_ifaddr *ifp; 1289 struct hlist_node *node; 1290 unsigned int hash = ipv6_addr_hash(addr); 1291 1292 rcu_read_lock_bh(); 1293 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1294 if (!net_eq(dev_net(ifp->idev->dev), net)) 1295 continue; 1296 if (ipv6_addr_equal(&ifp->addr, addr) && 1297 !(ifp->flags&IFA_F_TENTATIVE) && 1298 (dev == NULL || ifp->idev->dev == dev || 1299 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1300 rcu_read_unlock_bh(); 1301 return 1; 1302 } 1303 } 1304 1305 rcu_read_unlock_bh(); 1306 return 0; 1307 } 1308 EXPORT_SYMBOL(ipv6_chk_addr); 1309 1310 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1311 struct net_device *dev) 1312 { 1313 unsigned int hash = ipv6_addr_hash(addr); 1314 struct inet6_ifaddr *ifp; 1315 struct hlist_node *node; 1316 1317 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1318 if (!net_eq(dev_net(ifp->idev->dev), net)) 1319 continue; 1320 if (ipv6_addr_equal(&ifp->addr, addr)) { 1321 if (dev == NULL || ifp->idev->dev == dev) 1322 return true; 1323 } 1324 } 1325 return false; 1326 } 1327 1328 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1329 { 1330 struct inet6_dev *idev; 1331 struct inet6_ifaddr *ifa; 1332 int onlink; 1333 1334 onlink = 0; 1335 rcu_read_lock(); 1336 idev = __in6_dev_get(dev); 1337 if (idev) { 1338 read_lock_bh(&idev->lock); 1339 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1340 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1341 ifa->prefix_len); 1342 if (onlink) 1343 break; 1344 } 1345 read_unlock_bh(&idev->lock); 1346 } 1347 rcu_read_unlock(); 1348 return onlink; 1349 } 1350 1351 EXPORT_SYMBOL(ipv6_chk_prefix); 1352 1353 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1354 struct net_device *dev, int strict) 1355 { 1356 struct inet6_ifaddr *ifp, *result = NULL; 1357 unsigned int hash = ipv6_addr_hash(addr); 1358 struct hlist_node *node; 1359 1360 rcu_read_lock_bh(); 1361 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1362 if (!net_eq(dev_net(ifp->idev->dev), net)) 1363 continue; 1364 if (ipv6_addr_equal(&ifp->addr, addr)) { 1365 if (dev == NULL || ifp->idev->dev == dev || 1366 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1367 result = ifp; 1368 in6_ifa_hold(ifp); 1369 break; 1370 } 1371 } 1372 } 1373 rcu_read_unlock_bh(); 1374 1375 return result; 1376 } 1377 1378 /* Gets referenced address, destroys ifaddr */ 1379 1380 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1381 { 1382 if (ifp->flags&IFA_F_PERMANENT) { 1383 spin_lock_bh(&ifp->lock); 1384 addrconf_del_timer(ifp); 1385 ifp->flags |= IFA_F_TENTATIVE; 1386 if (dad_failed) 1387 ifp->flags |= IFA_F_DADFAILED; 1388 spin_unlock_bh(&ifp->lock); 1389 if (dad_failed) 1390 ipv6_ifa_notify(0, ifp); 1391 in6_ifa_put(ifp); 1392 #ifdef CONFIG_IPV6_PRIVACY 1393 } else if (ifp->flags&IFA_F_TEMPORARY) { 1394 struct inet6_ifaddr *ifpub; 1395 spin_lock_bh(&ifp->lock); 1396 ifpub = ifp->ifpub; 1397 if (ifpub) { 1398 in6_ifa_hold(ifpub); 1399 spin_unlock_bh(&ifp->lock); 1400 ipv6_create_tempaddr(ifpub, ifp); 1401 in6_ifa_put(ifpub); 1402 } else { 1403 spin_unlock_bh(&ifp->lock); 1404 } 1405 ipv6_del_addr(ifp); 1406 #endif 1407 } else 1408 ipv6_del_addr(ifp); 1409 } 1410 1411 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1412 { 1413 int err = -ENOENT; 1414 1415 spin_lock(&ifp->state_lock); 1416 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1417 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1418 err = 0; 1419 } 1420 spin_unlock(&ifp->state_lock); 1421 1422 return err; 1423 } 1424 1425 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1426 { 1427 struct inet6_dev *idev = ifp->idev; 1428 1429 if (addrconf_dad_end(ifp)) 1430 return; 1431 1432 if (net_ratelimit()) 1433 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1434 ifp->idev->dev->name, &ifp->addr); 1435 1436 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1437 struct in6_addr addr; 1438 1439 addr.s6_addr32[0] = htonl(0xfe800000); 1440 addr.s6_addr32[1] = 0; 1441 1442 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1443 ipv6_addr_equal(&ifp->addr, &addr)) { 1444 /* DAD failed for link-local based on MAC address */ 1445 idev->cnf.disable_ipv6 = 1; 1446 1447 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1448 ifp->idev->dev->name); 1449 } 1450 } 1451 1452 addrconf_dad_stop(ifp, 1); 1453 } 1454 1455 /* Join to solicited addr multicast group. */ 1456 1457 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1458 { 1459 struct in6_addr maddr; 1460 1461 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1462 return; 1463 1464 addrconf_addr_solict_mult(addr, &maddr); 1465 ipv6_dev_mc_inc(dev, &maddr); 1466 } 1467 1468 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1469 { 1470 struct in6_addr maddr; 1471 1472 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1473 return; 1474 1475 addrconf_addr_solict_mult(addr, &maddr); 1476 __ipv6_dev_mc_dec(idev, &maddr); 1477 } 1478 1479 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1480 { 1481 struct in6_addr addr; 1482 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1483 if (ipv6_addr_any(&addr)) 1484 return; 1485 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1486 } 1487 1488 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1489 { 1490 struct in6_addr addr; 1491 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1492 if (ipv6_addr_any(&addr)) 1493 return; 1494 __ipv6_dev_ac_dec(ifp->idev, &addr); 1495 } 1496 1497 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1498 { 1499 if (dev->addr_len != ETH_ALEN) 1500 return -1; 1501 memcpy(eui, dev->dev_addr, 3); 1502 memcpy(eui + 5, dev->dev_addr + 3, 3); 1503 1504 /* 1505 * The zSeries OSA network cards can be shared among various 1506 * OS instances, but the OSA cards have only one MAC address. 1507 * This leads to duplicate address conflicts in conjunction 1508 * with IPv6 if more than one instance uses the same card. 1509 * 1510 * The driver for these cards can deliver a unique 16-bit 1511 * identifier for each instance sharing the same card. It is 1512 * placed instead of 0xFFFE in the interface identifier. The 1513 * "u" bit of the interface identifier is not inverted in this 1514 * case. Hence the resulting interface identifier has local 1515 * scope according to RFC2373. 1516 */ 1517 if (dev->dev_id) { 1518 eui[3] = (dev->dev_id >> 8) & 0xFF; 1519 eui[4] = dev->dev_id & 0xFF; 1520 } else { 1521 eui[3] = 0xFF; 1522 eui[4] = 0xFE; 1523 eui[0] ^= 2; 1524 } 1525 return 0; 1526 } 1527 1528 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1529 { 1530 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1531 if (dev->addr_len != ARCNET_ALEN) 1532 return -1; 1533 memset(eui, 0, 7); 1534 eui[7] = *(u8*)dev->dev_addr; 1535 return 0; 1536 } 1537 1538 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1539 { 1540 if (dev->addr_len != INFINIBAND_ALEN) 1541 return -1; 1542 memcpy(eui, dev->dev_addr + 12, 8); 1543 eui[0] |= 2; 1544 return 0; 1545 } 1546 1547 int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1548 { 1549 if (addr == 0) 1550 return -1; 1551 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1552 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1553 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1554 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1555 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1556 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1557 eui[1] = 0; 1558 eui[2] = 0x5E; 1559 eui[3] = 0xFE; 1560 memcpy(eui + 4, &addr, 4); 1561 return 0; 1562 } 1563 EXPORT_SYMBOL(__ipv6_isatap_ifid); 1564 1565 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1566 { 1567 if (dev->priv_flags & IFF_ISATAP) 1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1569 return -1; 1570 } 1571 1572 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1573 { 1574 switch (dev->type) { 1575 case ARPHRD_ETHER: 1576 case ARPHRD_FDDI: 1577 case ARPHRD_IEEE802_TR: 1578 return addrconf_ifid_eui48(eui, dev); 1579 case ARPHRD_ARCNET: 1580 return addrconf_ifid_arcnet(eui, dev); 1581 case ARPHRD_INFINIBAND: 1582 return addrconf_ifid_infiniband(eui, dev); 1583 case ARPHRD_SIT: 1584 return addrconf_ifid_sit(eui, dev); 1585 } 1586 return -1; 1587 } 1588 1589 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1590 { 1591 int err = -1; 1592 struct inet6_ifaddr *ifp; 1593 1594 read_lock_bh(&idev->lock); 1595 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1596 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1597 memcpy(eui, ifp->addr.s6_addr+8, 8); 1598 err = 0; 1599 break; 1600 } 1601 } 1602 read_unlock_bh(&idev->lock); 1603 return err; 1604 } 1605 1606 #ifdef CONFIG_IPV6_PRIVACY 1607 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1608 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1609 { 1610 regen: 1611 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1612 idev->rndid[0] &= ~0x02; 1613 1614 /* 1615 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1616 * check if generated address is not inappropriate 1617 * 1618 * - Reserved subnet anycast (RFC 2526) 1619 * 11111101 11....11 1xxxxxxx 1620 * - ISATAP (RFC4214) 6.1 1621 * 00-00-5E-FE-xx-xx-xx-xx 1622 * - value 0 1623 * - XXX: already assigned to an address on the device 1624 */ 1625 if (idev->rndid[0] == 0xfd && 1626 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1627 (idev->rndid[7]&0x80)) 1628 goto regen; 1629 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1630 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1631 goto regen; 1632 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1633 goto regen; 1634 } 1635 1636 return 0; 1637 } 1638 1639 static void ipv6_regen_rndid(unsigned long data) 1640 { 1641 struct inet6_dev *idev = (struct inet6_dev *) data; 1642 unsigned long expires; 1643 1644 rcu_read_lock_bh(); 1645 write_lock_bh(&idev->lock); 1646 1647 if (idev->dead) 1648 goto out; 1649 1650 if (__ipv6_regen_rndid(idev) < 0) 1651 goto out; 1652 1653 expires = jiffies + 1654 idev->cnf.temp_prefered_lft * HZ - 1655 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1656 idev->cnf.max_desync_factor * HZ; 1657 if (time_before(expires, jiffies)) { 1658 printk(KERN_WARNING 1659 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1660 idev->dev->name); 1661 goto out; 1662 } 1663 1664 if (!mod_timer(&idev->regen_timer, expires)) 1665 in6_dev_hold(idev); 1666 1667 out: 1668 write_unlock_bh(&idev->lock); 1669 rcu_read_unlock_bh(); 1670 in6_dev_put(idev); 1671 } 1672 1673 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1674 int ret = 0; 1675 1676 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1677 ret = __ipv6_regen_rndid(idev); 1678 return ret; 1679 } 1680 #endif 1681 1682 /* 1683 * Add prefix route. 1684 */ 1685 1686 static void 1687 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1688 unsigned long expires, u32 flags) 1689 { 1690 struct fib6_config cfg = { 1691 .fc_table = RT6_TABLE_PREFIX, 1692 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1693 .fc_ifindex = dev->ifindex, 1694 .fc_expires = expires, 1695 .fc_dst_len = plen, 1696 .fc_flags = RTF_UP | flags, 1697 .fc_nlinfo.nl_net = dev_net(dev), 1698 .fc_protocol = RTPROT_KERNEL, 1699 }; 1700 1701 ipv6_addr_copy(&cfg.fc_dst, pfx); 1702 1703 /* Prevent useless cloning on PtP SIT. 1704 This thing is done here expecting that the whole 1705 class of non-broadcast devices need not cloning. 1706 */ 1707 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1708 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1709 cfg.fc_flags |= RTF_NONEXTHOP; 1710 #endif 1711 1712 ip6_route_add(&cfg); 1713 } 1714 1715 /* Create "default" multicast route to the interface */ 1716 1717 static void addrconf_add_mroute(struct net_device *dev) 1718 { 1719 struct fib6_config cfg = { 1720 .fc_table = RT6_TABLE_LOCAL, 1721 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1722 .fc_ifindex = dev->ifindex, 1723 .fc_dst_len = 8, 1724 .fc_flags = RTF_UP, 1725 .fc_nlinfo.nl_net = dev_net(dev), 1726 }; 1727 1728 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1729 1730 ip6_route_add(&cfg); 1731 } 1732 1733 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1734 static void sit_route_add(struct net_device *dev) 1735 { 1736 struct fib6_config cfg = { 1737 .fc_table = RT6_TABLE_MAIN, 1738 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1739 .fc_ifindex = dev->ifindex, 1740 .fc_dst_len = 96, 1741 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1742 .fc_nlinfo.nl_net = dev_net(dev), 1743 }; 1744 1745 /* prefix length - 96 bits "::d.d.d.d" */ 1746 ip6_route_add(&cfg); 1747 } 1748 #endif 1749 1750 static void addrconf_add_lroute(struct net_device *dev) 1751 { 1752 struct in6_addr addr; 1753 1754 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1755 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1756 } 1757 1758 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1759 { 1760 struct inet6_dev *idev; 1761 1762 ASSERT_RTNL(); 1763 1764 idev = ipv6_find_idev(dev); 1765 if (!idev) 1766 return ERR_PTR(-ENOBUFS); 1767 1768 if (idev->cnf.disable_ipv6) 1769 return ERR_PTR(-EACCES); 1770 1771 /* Add default multicast route */ 1772 addrconf_add_mroute(dev); 1773 1774 /* Add link local route */ 1775 addrconf_add_lroute(dev); 1776 return idev; 1777 } 1778 1779 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1780 { 1781 struct prefix_info *pinfo; 1782 __u32 valid_lft; 1783 __u32 prefered_lft; 1784 int addr_type; 1785 struct inet6_dev *in6_dev; 1786 struct net *net = dev_net(dev); 1787 1788 pinfo = (struct prefix_info *) opt; 1789 1790 if (len < sizeof(struct prefix_info)) { 1791 ADBG(("addrconf: prefix option too short\n")); 1792 return; 1793 } 1794 1795 /* 1796 * Validation checks ([ADDRCONF], page 19) 1797 */ 1798 1799 addr_type = ipv6_addr_type(&pinfo->prefix); 1800 1801 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1802 return; 1803 1804 valid_lft = ntohl(pinfo->valid); 1805 prefered_lft = ntohl(pinfo->prefered); 1806 1807 if (prefered_lft > valid_lft) { 1808 if (net_ratelimit()) 1809 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1810 return; 1811 } 1812 1813 in6_dev = in6_dev_get(dev); 1814 1815 if (in6_dev == NULL) { 1816 if (net_ratelimit()) 1817 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1818 return; 1819 } 1820 1821 /* 1822 * Two things going on here: 1823 * 1) Add routes for on-link prefixes 1824 * 2) Configure prefixes with the auto flag set 1825 */ 1826 1827 if (pinfo->onlink) { 1828 struct rt6_info *rt; 1829 unsigned long rt_expires; 1830 1831 /* Avoid arithmetic overflow. Really, we could 1832 * save rt_expires in seconds, likely valid_lft, 1833 * but it would require division in fib gc, that it 1834 * not good. 1835 */ 1836 if (HZ > USER_HZ) 1837 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1838 else 1839 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1840 1841 if (addrconf_finite_timeout(rt_expires)) 1842 rt_expires *= HZ; 1843 1844 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1845 dev->ifindex, 1); 1846 1847 if (rt && addrconf_is_prefix_route(rt)) { 1848 /* Autoconf prefix route */ 1849 if (valid_lft == 0) { 1850 ip6_del_rt(rt); 1851 rt = NULL; 1852 } else if (addrconf_finite_timeout(rt_expires)) { 1853 /* not infinity */ 1854 rt->rt6i_expires = jiffies + rt_expires; 1855 rt->rt6i_flags |= RTF_EXPIRES; 1856 } else { 1857 rt->rt6i_flags &= ~RTF_EXPIRES; 1858 rt->rt6i_expires = 0; 1859 } 1860 } else if (valid_lft) { 1861 clock_t expires = 0; 1862 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1863 if (addrconf_finite_timeout(rt_expires)) { 1864 /* not infinity */ 1865 flags |= RTF_EXPIRES; 1866 expires = jiffies_to_clock_t(rt_expires); 1867 } 1868 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1869 dev, expires, flags); 1870 } 1871 if (rt) 1872 dst_release(&rt->dst); 1873 } 1874 1875 /* Try to figure out our local address for this prefix */ 1876 1877 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1878 struct inet6_ifaddr * ifp; 1879 struct in6_addr addr; 1880 int create = 0, update_lft = 0; 1881 1882 if (pinfo->prefix_len == 64) { 1883 memcpy(&addr, &pinfo->prefix, 8); 1884 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1885 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1886 in6_dev_put(in6_dev); 1887 return; 1888 } 1889 goto ok; 1890 } 1891 if (net_ratelimit()) 1892 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1893 pinfo->prefix_len); 1894 in6_dev_put(in6_dev); 1895 return; 1896 1897 ok: 1898 1899 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1900 1901 if (ifp == NULL && valid_lft) { 1902 int max_addresses = in6_dev->cnf.max_addresses; 1903 u32 addr_flags = 0; 1904 1905 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1906 if (in6_dev->cnf.optimistic_dad && 1907 !net->ipv6.devconf_all->forwarding) 1908 addr_flags = IFA_F_OPTIMISTIC; 1909 #endif 1910 1911 /* Do not allow to create too much of autoconfigured 1912 * addresses; this would be too easy way to crash kernel. 1913 */ 1914 if (!max_addresses || 1915 ipv6_count_addresses(in6_dev) < max_addresses) 1916 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1917 addr_type&IPV6_ADDR_SCOPE_MASK, 1918 addr_flags); 1919 1920 if (!ifp || IS_ERR(ifp)) { 1921 in6_dev_put(in6_dev); 1922 return; 1923 } 1924 1925 update_lft = create = 1; 1926 ifp->cstamp = jiffies; 1927 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1928 } 1929 1930 if (ifp) { 1931 int flags; 1932 unsigned long now; 1933 #ifdef CONFIG_IPV6_PRIVACY 1934 struct inet6_ifaddr *ift; 1935 #endif 1936 u32 stored_lft; 1937 1938 /* update lifetime (RFC2462 5.5.3 e) */ 1939 spin_lock(&ifp->lock); 1940 now = jiffies; 1941 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1942 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1943 else 1944 stored_lft = 0; 1945 if (!update_lft && stored_lft) { 1946 if (valid_lft > MIN_VALID_LIFETIME || 1947 valid_lft > stored_lft) 1948 update_lft = 1; 1949 else if (stored_lft <= MIN_VALID_LIFETIME) { 1950 /* valid_lft <= stored_lft is always true */ 1951 /* 1952 * RFC 4862 Section 5.5.3e: 1953 * "Note that the preferred lifetime of 1954 * the corresponding address is always 1955 * reset to the Preferred Lifetime in 1956 * the received Prefix Information 1957 * option, regardless of whether the 1958 * valid lifetime is also reset or 1959 * ignored." 1960 * 1961 * So if the preferred lifetime in 1962 * this advertisement is different 1963 * than what we have stored, but the 1964 * valid lifetime is invalid, just 1965 * reset prefered_lft. 1966 * 1967 * We must set the valid lifetime 1968 * to the stored lifetime since we'll 1969 * be updating the timestamp below, 1970 * else we'll set it back to the 1971 * minumum. 1972 */ 1973 if (prefered_lft != ifp->prefered_lft) { 1974 valid_lft = stored_lft; 1975 update_lft = 1; 1976 } 1977 } else { 1978 valid_lft = MIN_VALID_LIFETIME; 1979 if (valid_lft < prefered_lft) 1980 prefered_lft = valid_lft; 1981 update_lft = 1; 1982 } 1983 } 1984 1985 if (update_lft) { 1986 ifp->valid_lft = valid_lft; 1987 ifp->prefered_lft = prefered_lft; 1988 ifp->tstamp = now; 1989 flags = ifp->flags; 1990 ifp->flags &= ~IFA_F_DEPRECATED; 1991 spin_unlock(&ifp->lock); 1992 1993 if (!(flags&IFA_F_TENTATIVE)) 1994 ipv6_ifa_notify(0, ifp); 1995 } else 1996 spin_unlock(&ifp->lock); 1997 1998 #ifdef CONFIG_IPV6_PRIVACY 1999 read_lock_bh(&in6_dev->lock); 2000 /* update all temporary addresses in the list */ 2001 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) { 2002 /* 2003 * When adjusting the lifetimes of an existing 2004 * temporary address, only lower the lifetimes. 2005 * Implementations must not increase the 2006 * lifetimes of an existing temporary address 2007 * when processing a Prefix Information Option. 2008 */ 2009 if (ifp != ift->ifpub) 2010 continue; 2011 2012 spin_lock(&ift->lock); 2013 flags = ift->flags; 2014 if (ift->valid_lft > valid_lft && 2015 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 2016 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 2017 if (ift->prefered_lft > prefered_lft && 2018 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 2019 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 2020 spin_unlock(&ift->lock); 2021 if (!(flags&IFA_F_TENTATIVE)) 2022 ipv6_ifa_notify(0, ift); 2023 } 2024 2025 if (create && in6_dev->cnf.use_tempaddr > 0) { 2026 /* 2027 * When a new public address is created as described in [ADDRCONF], 2028 * also create a new temporary address. 2029 */ 2030 read_unlock_bh(&in6_dev->lock); 2031 ipv6_create_tempaddr(ifp, NULL); 2032 } else { 2033 read_unlock_bh(&in6_dev->lock); 2034 } 2035 #endif 2036 in6_ifa_put(ifp); 2037 addrconf_verify(0); 2038 } 2039 } 2040 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2041 in6_dev_put(in6_dev); 2042 } 2043 2044 /* 2045 * Set destination address. 2046 * Special case for SIT interfaces where we create a new "virtual" 2047 * device. 2048 */ 2049 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2050 { 2051 struct in6_ifreq ireq; 2052 struct net_device *dev; 2053 int err = -EINVAL; 2054 2055 rtnl_lock(); 2056 2057 err = -EFAULT; 2058 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2059 goto err_exit; 2060 2061 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2062 2063 err = -ENODEV; 2064 if (dev == NULL) 2065 goto err_exit; 2066 2067 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2068 if (dev->type == ARPHRD_SIT) { 2069 const struct net_device_ops *ops = dev->netdev_ops; 2070 struct ifreq ifr; 2071 struct ip_tunnel_parm p; 2072 2073 err = -EADDRNOTAVAIL; 2074 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2075 goto err_exit; 2076 2077 memset(&p, 0, sizeof(p)); 2078 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2079 p.iph.saddr = 0; 2080 p.iph.version = 4; 2081 p.iph.ihl = 5; 2082 p.iph.protocol = IPPROTO_IPV6; 2083 p.iph.ttl = 64; 2084 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2085 2086 if (ops->ndo_do_ioctl) { 2087 mm_segment_t oldfs = get_fs(); 2088 2089 set_fs(KERNEL_DS); 2090 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2091 set_fs(oldfs); 2092 } else 2093 err = -EOPNOTSUPP; 2094 2095 if (err == 0) { 2096 err = -ENOBUFS; 2097 dev = __dev_get_by_name(net, p.name); 2098 if (!dev) 2099 goto err_exit; 2100 err = dev_open(dev); 2101 } 2102 } 2103 #endif 2104 2105 err_exit: 2106 rtnl_unlock(); 2107 return err; 2108 } 2109 2110 /* 2111 * Manual configuration of address on an interface 2112 */ 2113 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2114 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2115 __u32 valid_lft) 2116 { 2117 struct inet6_ifaddr *ifp; 2118 struct inet6_dev *idev; 2119 struct net_device *dev; 2120 int scope; 2121 u32 flags; 2122 clock_t expires; 2123 unsigned long timeout; 2124 2125 ASSERT_RTNL(); 2126 2127 if (plen > 128) 2128 return -EINVAL; 2129 2130 /* check the lifetime */ 2131 if (!valid_lft || prefered_lft > valid_lft) 2132 return -EINVAL; 2133 2134 dev = __dev_get_by_index(net, ifindex); 2135 if (!dev) 2136 return -ENODEV; 2137 2138 idev = addrconf_add_dev(dev); 2139 if (IS_ERR(idev)) 2140 return PTR_ERR(idev); 2141 2142 scope = ipv6_addr_scope(pfx); 2143 2144 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2145 if (addrconf_finite_timeout(timeout)) { 2146 expires = jiffies_to_clock_t(timeout * HZ); 2147 valid_lft = timeout; 2148 flags = RTF_EXPIRES; 2149 } else { 2150 expires = 0; 2151 flags = 0; 2152 ifa_flags |= IFA_F_PERMANENT; 2153 } 2154 2155 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2156 if (addrconf_finite_timeout(timeout)) { 2157 if (timeout == 0) 2158 ifa_flags |= IFA_F_DEPRECATED; 2159 prefered_lft = timeout; 2160 } 2161 2162 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2163 2164 if (!IS_ERR(ifp)) { 2165 spin_lock_bh(&ifp->lock); 2166 ifp->valid_lft = valid_lft; 2167 ifp->prefered_lft = prefered_lft; 2168 ifp->tstamp = jiffies; 2169 spin_unlock_bh(&ifp->lock); 2170 2171 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2172 expires, flags); 2173 /* 2174 * Note that section 3.1 of RFC 4429 indicates 2175 * that the Optimistic flag should not be set for 2176 * manually configured addresses 2177 */ 2178 addrconf_dad_start(ifp, 0); 2179 in6_ifa_put(ifp); 2180 addrconf_verify(0); 2181 return 0; 2182 } 2183 2184 return PTR_ERR(ifp); 2185 } 2186 2187 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2188 unsigned int plen) 2189 { 2190 struct inet6_ifaddr *ifp; 2191 struct inet6_dev *idev; 2192 struct net_device *dev; 2193 2194 if (plen > 128) 2195 return -EINVAL; 2196 2197 dev = __dev_get_by_index(net, ifindex); 2198 if (!dev) 2199 return -ENODEV; 2200 2201 if ((idev = __in6_dev_get(dev)) == NULL) 2202 return -ENXIO; 2203 2204 read_lock_bh(&idev->lock); 2205 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2206 if (ifp->prefix_len == plen && 2207 ipv6_addr_equal(pfx, &ifp->addr)) { 2208 in6_ifa_hold(ifp); 2209 read_unlock_bh(&idev->lock); 2210 2211 ipv6_del_addr(ifp); 2212 2213 /* If the last address is deleted administratively, 2214 disable IPv6 on this interface. 2215 */ 2216 if (list_empty(&idev->addr_list)) 2217 addrconf_ifdown(idev->dev, 1); 2218 return 0; 2219 } 2220 } 2221 read_unlock_bh(&idev->lock); 2222 return -EADDRNOTAVAIL; 2223 } 2224 2225 2226 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2227 { 2228 struct in6_ifreq ireq; 2229 int err; 2230 2231 if (!capable(CAP_NET_ADMIN)) 2232 return -EPERM; 2233 2234 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2235 return -EFAULT; 2236 2237 rtnl_lock(); 2238 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2239 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2240 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2241 rtnl_unlock(); 2242 return err; 2243 } 2244 2245 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2246 { 2247 struct in6_ifreq ireq; 2248 int err; 2249 2250 if (!capable(CAP_NET_ADMIN)) 2251 return -EPERM; 2252 2253 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2254 return -EFAULT; 2255 2256 rtnl_lock(); 2257 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2258 ireq.ifr6_prefixlen); 2259 rtnl_unlock(); 2260 return err; 2261 } 2262 2263 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2264 int plen, int scope) 2265 { 2266 struct inet6_ifaddr *ifp; 2267 2268 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2269 if (!IS_ERR(ifp)) { 2270 spin_lock_bh(&ifp->lock); 2271 ifp->flags &= ~IFA_F_TENTATIVE; 2272 spin_unlock_bh(&ifp->lock); 2273 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2274 in6_ifa_put(ifp); 2275 } 2276 } 2277 2278 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2279 static void sit_add_v4_addrs(struct inet6_dev *idev) 2280 { 2281 struct in6_addr addr; 2282 struct net_device *dev; 2283 struct net *net = dev_net(idev->dev); 2284 int scope; 2285 2286 ASSERT_RTNL(); 2287 2288 memset(&addr, 0, sizeof(struct in6_addr)); 2289 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2290 2291 if (idev->dev->flags&IFF_POINTOPOINT) { 2292 addr.s6_addr32[0] = htonl(0xfe800000); 2293 scope = IFA_LINK; 2294 } else { 2295 scope = IPV6_ADDR_COMPATv4; 2296 } 2297 2298 if (addr.s6_addr32[3]) { 2299 add_addr(idev, &addr, 128, scope); 2300 return; 2301 } 2302 2303 for_each_netdev(net, dev) { 2304 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2305 if (in_dev && (dev->flags & IFF_UP)) { 2306 struct in_ifaddr * ifa; 2307 2308 int flag = scope; 2309 2310 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2311 int plen; 2312 2313 addr.s6_addr32[3] = ifa->ifa_local; 2314 2315 if (ifa->ifa_scope == RT_SCOPE_LINK) 2316 continue; 2317 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2318 if (idev->dev->flags&IFF_POINTOPOINT) 2319 continue; 2320 flag |= IFA_HOST; 2321 } 2322 if (idev->dev->flags&IFF_POINTOPOINT) 2323 plen = 64; 2324 else 2325 plen = 96; 2326 2327 add_addr(idev, &addr, plen, flag); 2328 } 2329 } 2330 } 2331 } 2332 #endif 2333 2334 static void init_loopback(struct net_device *dev) 2335 { 2336 struct inet6_dev *idev; 2337 2338 /* ::1 */ 2339 2340 ASSERT_RTNL(); 2341 2342 if ((idev = ipv6_find_idev(dev)) == NULL) { 2343 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2344 return; 2345 } 2346 2347 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2348 } 2349 2350 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2351 { 2352 struct inet6_ifaddr * ifp; 2353 u32 addr_flags = IFA_F_PERMANENT; 2354 2355 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2356 if (idev->cnf.optimistic_dad && 2357 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2358 addr_flags |= IFA_F_OPTIMISTIC; 2359 #endif 2360 2361 2362 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2363 if (!IS_ERR(ifp)) { 2364 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2365 addrconf_dad_start(ifp, 0); 2366 in6_ifa_put(ifp); 2367 } 2368 } 2369 2370 static void addrconf_dev_config(struct net_device *dev) 2371 { 2372 struct in6_addr addr; 2373 struct inet6_dev * idev; 2374 2375 ASSERT_RTNL(); 2376 2377 if ((dev->type != ARPHRD_ETHER) && 2378 (dev->type != ARPHRD_FDDI) && 2379 (dev->type != ARPHRD_IEEE802_TR) && 2380 (dev->type != ARPHRD_ARCNET) && 2381 (dev->type != ARPHRD_INFINIBAND)) { 2382 /* Alas, we support only Ethernet autoconfiguration. */ 2383 return; 2384 } 2385 2386 idev = addrconf_add_dev(dev); 2387 if (IS_ERR(idev)) 2388 return; 2389 2390 memset(&addr, 0, sizeof(struct in6_addr)); 2391 addr.s6_addr32[0] = htonl(0xFE800000); 2392 2393 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2394 addrconf_add_linklocal(idev, &addr); 2395 } 2396 2397 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2398 static void addrconf_sit_config(struct net_device *dev) 2399 { 2400 struct inet6_dev *idev; 2401 2402 ASSERT_RTNL(); 2403 2404 /* 2405 * Configure the tunnel with one of our IPv4 2406 * addresses... we should configure all of 2407 * our v4 addrs in the tunnel 2408 */ 2409 2410 if ((idev = ipv6_find_idev(dev)) == NULL) { 2411 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2412 return; 2413 } 2414 2415 if (dev->priv_flags & IFF_ISATAP) { 2416 struct in6_addr addr; 2417 2418 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2419 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2420 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2421 addrconf_add_linklocal(idev, &addr); 2422 return; 2423 } 2424 2425 sit_add_v4_addrs(idev); 2426 2427 if (dev->flags&IFF_POINTOPOINT) { 2428 addrconf_add_mroute(dev); 2429 addrconf_add_lroute(dev); 2430 } else 2431 sit_route_add(dev); 2432 } 2433 #endif 2434 2435 static inline int 2436 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2437 { 2438 struct in6_addr lladdr; 2439 2440 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2441 addrconf_add_linklocal(idev, &lladdr); 2442 return 0; 2443 } 2444 return -1; 2445 } 2446 2447 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2448 { 2449 struct net_device *link_dev; 2450 struct net *net = dev_net(idev->dev); 2451 2452 /* first try to inherit the link-local address from the link device */ 2453 if (idev->dev->iflink && 2454 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2455 if (!ipv6_inherit_linklocal(idev, link_dev)) 2456 return; 2457 } 2458 /* then try to inherit it from any device */ 2459 for_each_netdev(net, link_dev) { 2460 if (!ipv6_inherit_linklocal(idev, link_dev)) 2461 return; 2462 } 2463 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2464 } 2465 2466 /* 2467 * Autoconfigure tunnel with a link-local address so routing protocols, 2468 * DHCPv6, MLD etc. can be run over the virtual link 2469 */ 2470 2471 static void addrconf_ip6_tnl_config(struct net_device *dev) 2472 { 2473 struct inet6_dev *idev; 2474 2475 ASSERT_RTNL(); 2476 2477 idev = addrconf_add_dev(dev); 2478 if (IS_ERR(idev)) { 2479 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2480 return; 2481 } 2482 ip6_tnl_add_linklocal(idev); 2483 } 2484 2485 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2486 void * data) 2487 { 2488 struct net_device *dev = (struct net_device *) data; 2489 struct inet6_dev *idev = __in6_dev_get(dev); 2490 int run_pending = 0; 2491 int err; 2492 2493 switch (event) { 2494 case NETDEV_REGISTER: 2495 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2496 idev = ipv6_add_dev(dev); 2497 if (!idev) 2498 return notifier_from_errno(-ENOMEM); 2499 } 2500 break; 2501 2502 case NETDEV_UP: 2503 case NETDEV_CHANGE: 2504 if (dev->flags & IFF_SLAVE) 2505 break; 2506 2507 if (event == NETDEV_UP) { 2508 if (!addrconf_qdisc_ok(dev)) { 2509 /* device is not ready yet. */ 2510 printk(KERN_INFO 2511 "ADDRCONF(NETDEV_UP): %s: " 2512 "link is not ready\n", 2513 dev->name); 2514 break; 2515 } 2516 2517 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2518 idev = ipv6_add_dev(dev); 2519 2520 if (idev) { 2521 idev->if_flags |= IF_READY; 2522 run_pending = 1; 2523 } 2524 } else { 2525 if (!addrconf_qdisc_ok(dev)) { 2526 /* device is still not ready. */ 2527 break; 2528 } 2529 2530 if (idev) { 2531 if (idev->if_flags & IF_READY) 2532 /* device is already configured. */ 2533 break; 2534 idev->if_flags |= IF_READY; 2535 } 2536 2537 printk(KERN_INFO 2538 "ADDRCONF(NETDEV_CHANGE): %s: " 2539 "link becomes ready\n", 2540 dev->name); 2541 2542 run_pending = 1; 2543 } 2544 2545 switch (dev->type) { 2546 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2547 case ARPHRD_SIT: 2548 addrconf_sit_config(dev); 2549 break; 2550 #endif 2551 case ARPHRD_TUNNEL6: 2552 addrconf_ip6_tnl_config(dev); 2553 break; 2554 case ARPHRD_LOOPBACK: 2555 init_loopback(dev); 2556 break; 2557 2558 default: 2559 addrconf_dev_config(dev); 2560 break; 2561 } 2562 2563 if (idev) { 2564 if (run_pending) 2565 addrconf_dad_run(idev); 2566 2567 /* 2568 * If the MTU changed during the interface down, 2569 * when the interface up, the changed MTU must be 2570 * reflected in the idev as well as routers. 2571 */ 2572 if (idev->cnf.mtu6 != dev->mtu && 2573 dev->mtu >= IPV6_MIN_MTU) { 2574 rt6_mtu_change(dev, dev->mtu); 2575 idev->cnf.mtu6 = dev->mtu; 2576 } 2577 idev->tstamp = jiffies; 2578 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2579 2580 /* 2581 * If the changed mtu during down is lower than 2582 * IPV6_MIN_MTU stop IPv6 on this interface. 2583 */ 2584 if (dev->mtu < IPV6_MIN_MTU) 2585 addrconf_ifdown(dev, 1); 2586 } 2587 break; 2588 2589 case NETDEV_CHANGEMTU: 2590 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2591 rt6_mtu_change(dev, dev->mtu); 2592 idev->cnf.mtu6 = dev->mtu; 2593 break; 2594 } 2595 2596 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2597 idev = ipv6_add_dev(dev); 2598 if (idev) 2599 break; 2600 } 2601 2602 /* 2603 * MTU falled under IPV6_MIN_MTU. 2604 * Stop IPv6 on this interface. 2605 */ 2606 2607 case NETDEV_DOWN: 2608 case NETDEV_UNREGISTER: 2609 /* 2610 * Remove all addresses from this interface. 2611 */ 2612 addrconf_ifdown(dev, event != NETDEV_DOWN); 2613 break; 2614 2615 case NETDEV_CHANGENAME: 2616 if (idev) { 2617 snmp6_unregister_dev(idev); 2618 addrconf_sysctl_unregister(idev); 2619 addrconf_sysctl_register(idev); 2620 err = snmp6_register_dev(idev); 2621 if (err) 2622 return notifier_from_errno(err); 2623 } 2624 break; 2625 2626 case NETDEV_PRE_TYPE_CHANGE: 2627 case NETDEV_POST_TYPE_CHANGE: 2628 addrconf_type_change(dev, event); 2629 break; 2630 } 2631 2632 return NOTIFY_OK; 2633 } 2634 2635 /* 2636 * addrconf module should be notified of a device going up 2637 */ 2638 static struct notifier_block ipv6_dev_notf = { 2639 .notifier_call = addrconf_notify, 2640 }; 2641 2642 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2643 { 2644 struct inet6_dev *idev; 2645 ASSERT_RTNL(); 2646 2647 idev = __in6_dev_get(dev); 2648 2649 if (event == NETDEV_POST_TYPE_CHANGE) 2650 ipv6_mc_remap(idev); 2651 else if (event == NETDEV_PRE_TYPE_CHANGE) 2652 ipv6_mc_unmap(idev); 2653 } 2654 2655 static int addrconf_ifdown(struct net_device *dev, int how) 2656 { 2657 struct net *net = dev_net(dev); 2658 struct inet6_dev *idev; 2659 struct inet6_ifaddr *ifa; 2660 LIST_HEAD(keep_list); 2661 int state; 2662 2663 ASSERT_RTNL(); 2664 2665 rt6_ifdown(net, dev); 2666 neigh_ifdown(&nd_tbl, dev); 2667 2668 idev = __in6_dev_get(dev); 2669 if (idev == NULL) 2670 return -ENODEV; 2671 2672 /* 2673 * Step 1: remove reference to ipv6 device from parent device. 2674 * Do not dev_put! 2675 */ 2676 if (how) { 2677 idev->dead = 1; 2678 2679 /* protected by rtnl_lock */ 2680 rcu_assign_pointer(dev->ip6_ptr, NULL); 2681 2682 /* Step 1.5: remove snmp6 entry */ 2683 snmp6_unregister_dev(idev); 2684 2685 } 2686 2687 write_lock_bh(&idev->lock); 2688 2689 /* Step 2: clear flags for stateless addrconf */ 2690 if (!how) 2691 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2692 2693 #ifdef CONFIG_IPV6_PRIVACY 2694 if (how && del_timer(&idev->regen_timer)) 2695 in6_dev_put(idev); 2696 2697 /* Step 3: clear tempaddr list */ 2698 while (!list_empty(&idev->tempaddr_list)) { 2699 ifa = list_first_entry(&idev->tempaddr_list, 2700 struct inet6_ifaddr, tmp_list); 2701 list_del(&ifa->tmp_list); 2702 write_unlock_bh(&idev->lock); 2703 spin_lock_bh(&ifa->lock); 2704 2705 if (ifa->ifpub) { 2706 in6_ifa_put(ifa->ifpub); 2707 ifa->ifpub = NULL; 2708 } 2709 spin_unlock_bh(&ifa->lock); 2710 in6_ifa_put(ifa); 2711 write_lock_bh(&idev->lock); 2712 } 2713 #endif 2714 2715 while (!list_empty(&idev->addr_list)) { 2716 ifa = list_first_entry(&idev->addr_list, 2717 struct inet6_ifaddr, if_list); 2718 addrconf_del_timer(ifa); 2719 2720 /* If just doing link down, and address is permanent 2721 and not link-local, then retain it. */ 2722 if (!how && 2723 (ifa->flags&IFA_F_PERMANENT) && 2724 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) { 2725 list_move_tail(&ifa->if_list, &keep_list); 2726 2727 /* If not doing DAD on this address, just keep it. */ 2728 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) || 2729 idev->cnf.accept_dad <= 0 || 2730 (ifa->flags & IFA_F_NODAD)) 2731 continue; 2732 2733 /* If it was tentative already, no need to notify */ 2734 if (ifa->flags & IFA_F_TENTATIVE) 2735 continue; 2736 2737 /* Flag it for later restoration when link comes up */ 2738 ifa->flags |= IFA_F_TENTATIVE; 2739 ifa->state = INET6_IFADDR_STATE_DAD; 2740 2741 write_unlock_bh(&idev->lock); 2742 2743 in6_ifa_hold(ifa); 2744 } else { 2745 list_del(&ifa->if_list); 2746 2747 /* clear hash table */ 2748 spin_lock_bh(&addrconf_hash_lock); 2749 hlist_del_init_rcu(&ifa->addr_lst); 2750 spin_unlock_bh(&addrconf_hash_lock); 2751 2752 write_unlock_bh(&idev->lock); 2753 spin_lock_bh(&ifa->state_lock); 2754 state = ifa->state; 2755 ifa->state = INET6_IFADDR_STATE_DEAD; 2756 spin_unlock_bh(&ifa->state_lock); 2757 2758 if (state == INET6_IFADDR_STATE_DEAD) 2759 goto put_ifa; 2760 } 2761 2762 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2763 if (ifa->state == INET6_IFADDR_STATE_DEAD) 2764 atomic_notifier_call_chain(&inet6addr_chain, 2765 NETDEV_DOWN, ifa); 2766 2767 put_ifa: 2768 in6_ifa_put(ifa); 2769 2770 write_lock_bh(&idev->lock); 2771 } 2772 2773 list_splice(&keep_list, &idev->addr_list); 2774 2775 write_unlock_bh(&idev->lock); 2776 2777 /* Step 5: Discard multicast list */ 2778 if (how) 2779 ipv6_mc_destroy_dev(idev); 2780 else 2781 ipv6_mc_down(idev); 2782 2783 idev->tstamp = jiffies; 2784 2785 /* Last: Shot the device (if unregistered) */ 2786 if (how) { 2787 addrconf_sysctl_unregister(idev); 2788 neigh_parms_release(&nd_tbl, idev->nd_parms); 2789 neigh_ifdown(&nd_tbl, dev); 2790 in6_dev_put(idev); 2791 } 2792 return 0; 2793 } 2794 2795 static void addrconf_rs_timer(unsigned long data) 2796 { 2797 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2798 struct inet6_dev *idev = ifp->idev; 2799 2800 read_lock(&idev->lock); 2801 if (idev->dead || !(idev->if_flags & IF_READY)) 2802 goto out; 2803 2804 if (idev->cnf.forwarding) 2805 goto out; 2806 2807 /* Announcement received after solicitation was sent */ 2808 if (idev->if_flags & IF_RA_RCVD) 2809 goto out; 2810 2811 spin_lock(&ifp->lock); 2812 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2813 /* The wait after the last probe can be shorter */ 2814 addrconf_mod_timer(ifp, AC_RS, 2815 (ifp->probes == idev->cnf.rtr_solicits) ? 2816 idev->cnf.rtr_solicit_delay : 2817 idev->cnf.rtr_solicit_interval); 2818 spin_unlock(&ifp->lock); 2819 2820 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2821 } else { 2822 spin_unlock(&ifp->lock); 2823 /* 2824 * Note: we do not support deprecated "all on-link" 2825 * assumption any longer. 2826 */ 2827 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2828 idev->dev->name); 2829 } 2830 2831 out: 2832 read_unlock(&idev->lock); 2833 in6_ifa_put(ifp); 2834 } 2835 2836 /* 2837 * Duplicate Address Detection 2838 */ 2839 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2840 { 2841 unsigned long rand_num; 2842 struct inet6_dev *idev = ifp->idev; 2843 2844 if (ifp->flags & IFA_F_OPTIMISTIC) 2845 rand_num = 0; 2846 else 2847 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2848 2849 ifp->probes = idev->cnf.dad_transmits; 2850 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2851 } 2852 2853 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2854 { 2855 struct inet6_dev *idev = ifp->idev; 2856 struct net_device *dev = idev->dev; 2857 2858 addrconf_join_solict(dev, &ifp->addr); 2859 2860 net_srandom(ifp->addr.s6_addr32[3]); 2861 2862 read_lock_bh(&idev->lock); 2863 spin_lock(&ifp->lock); 2864 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2865 goto out; 2866 2867 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2868 idev->cnf.accept_dad < 1 || 2869 !(ifp->flags&IFA_F_TENTATIVE) || 2870 ifp->flags & IFA_F_NODAD) { 2871 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2872 spin_unlock(&ifp->lock); 2873 read_unlock_bh(&idev->lock); 2874 2875 addrconf_dad_completed(ifp); 2876 return; 2877 } 2878 2879 if (!(idev->if_flags & IF_READY)) { 2880 spin_unlock(&ifp->lock); 2881 read_unlock_bh(&idev->lock); 2882 /* 2883 * If the device is not ready: 2884 * - keep it tentative if it is a permanent address. 2885 * - otherwise, kill it. 2886 */ 2887 in6_ifa_hold(ifp); 2888 addrconf_dad_stop(ifp, 0); 2889 return; 2890 } 2891 2892 /* 2893 * Optimistic nodes can start receiving 2894 * Frames right away 2895 */ 2896 if (ifp->flags & IFA_F_OPTIMISTIC) 2897 ip6_ins_rt(ifp->rt); 2898 2899 addrconf_dad_kick(ifp); 2900 out: 2901 spin_unlock(&ifp->lock); 2902 read_unlock_bh(&idev->lock); 2903 } 2904 2905 static void addrconf_dad_timer(unsigned long data) 2906 { 2907 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2908 struct inet6_dev *idev = ifp->idev; 2909 struct in6_addr mcaddr; 2910 2911 if (!ifp->probes && addrconf_dad_end(ifp)) 2912 goto out; 2913 2914 read_lock(&idev->lock); 2915 if (idev->dead || !(idev->if_flags & IF_READY)) { 2916 read_unlock(&idev->lock); 2917 goto out; 2918 } 2919 2920 spin_lock(&ifp->lock); 2921 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2922 spin_unlock(&ifp->lock); 2923 read_unlock(&idev->lock); 2924 goto out; 2925 } 2926 2927 if (ifp->probes == 0) { 2928 /* 2929 * DAD was successful 2930 */ 2931 2932 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2933 spin_unlock(&ifp->lock); 2934 read_unlock(&idev->lock); 2935 2936 addrconf_dad_completed(ifp); 2937 2938 goto out; 2939 } 2940 2941 ifp->probes--; 2942 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2943 spin_unlock(&ifp->lock); 2944 read_unlock(&idev->lock); 2945 2946 /* send a neighbour solicitation for our addr */ 2947 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2948 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2949 out: 2950 in6_ifa_put(ifp); 2951 } 2952 2953 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2954 { 2955 struct net_device *dev = ifp->idev->dev; 2956 2957 /* 2958 * Configure the address for reception. Now it is valid. 2959 */ 2960 2961 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2962 2963 /* If added prefix is link local and forwarding is off, 2964 start sending router solicitations. 2965 */ 2966 2967 if (ifp->idev->cnf.forwarding == 0 && 2968 ifp->idev->cnf.rtr_solicits > 0 && 2969 (dev->flags&IFF_LOOPBACK) == 0 && 2970 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2971 /* 2972 * If a host as already performed a random delay 2973 * [...] as part of DAD [...] there is no need 2974 * to delay again before sending the first RS 2975 */ 2976 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2977 2978 spin_lock_bh(&ifp->lock); 2979 ifp->probes = 1; 2980 ifp->idev->if_flags |= IF_RS_SENT; 2981 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2982 spin_unlock_bh(&ifp->lock); 2983 } 2984 } 2985 2986 static void addrconf_dad_run(struct inet6_dev *idev) 2987 { 2988 struct inet6_ifaddr *ifp; 2989 2990 read_lock_bh(&idev->lock); 2991 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2992 spin_lock(&ifp->lock); 2993 if (ifp->flags & IFA_F_TENTATIVE && 2994 ifp->state == INET6_IFADDR_STATE_DAD) 2995 addrconf_dad_kick(ifp); 2996 spin_unlock(&ifp->lock); 2997 } 2998 read_unlock_bh(&idev->lock); 2999 } 3000 3001 #ifdef CONFIG_PROC_FS 3002 struct if6_iter_state { 3003 struct seq_net_private p; 3004 int bucket; 3005 }; 3006 3007 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 3008 { 3009 struct inet6_ifaddr *ifa = NULL; 3010 struct if6_iter_state *state = seq->private; 3011 struct net *net = seq_file_net(seq); 3012 3013 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3014 struct hlist_node *n; 3015 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3016 addr_lst) 3017 if (net_eq(dev_net(ifa->idev->dev), net)) 3018 return ifa; 3019 } 3020 return NULL; 3021 } 3022 3023 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3024 struct inet6_ifaddr *ifa) 3025 { 3026 struct if6_iter_state *state = seq->private; 3027 struct net *net = seq_file_net(seq); 3028 struct hlist_node *n = &ifa->addr_lst; 3029 3030 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) 3031 if (net_eq(dev_net(ifa->idev->dev), net)) 3032 return ifa; 3033 3034 while (++state->bucket < IN6_ADDR_HSIZE) { 3035 hlist_for_each_entry_rcu_bh(ifa, n, 3036 &inet6_addr_lst[state->bucket], addr_lst) { 3037 if (net_eq(dev_net(ifa->idev->dev), net)) 3038 return ifa; 3039 } 3040 } 3041 3042 return NULL; 3043 } 3044 3045 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3046 { 3047 struct inet6_ifaddr *ifa = if6_get_first(seq); 3048 3049 if (ifa) 3050 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3051 --pos; 3052 return pos ? NULL : ifa; 3053 } 3054 3055 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3056 __acquires(rcu_bh) 3057 { 3058 rcu_read_lock_bh(); 3059 return if6_get_idx(seq, *pos); 3060 } 3061 3062 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3063 { 3064 struct inet6_ifaddr *ifa; 3065 3066 ifa = if6_get_next(seq, v); 3067 ++*pos; 3068 return ifa; 3069 } 3070 3071 static void if6_seq_stop(struct seq_file *seq, void *v) 3072 __releases(rcu_bh) 3073 { 3074 rcu_read_unlock_bh(); 3075 } 3076 3077 static int if6_seq_show(struct seq_file *seq, void *v) 3078 { 3079 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3080 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3081 &ifp->addr, 3082 ifp->idev->dev->ifindex, 3083 ifp->prefix_len, 3084 ifp->scope, 3085 ifp->flags, 3086 ifp->idev->dev->name); 3087 return 0; 3088 } 3089 3090 static const struct seq_operations if6_seq_ops = { 3091 .start = if6_seq_start, 3092 .next = if6_seq_next, 3093 .show = if6_seq_show, 3094 .stop = if6_seq_stop, 3095 }; 3096 3097 static int if6_seq_open(struct inode *inode, struct file *file) 3098 { 3099 return seq_open_net(inode, file, &if6_seq_ops, 3100 sizeof(struct if6_iter_state)); 3101 } 3102 3103 static const struct file_operations if6_fops = { 3104 .owner = THIS_MODULE, 3105 .open = if6_seq_open, 3106 .read = seq_read, 3107 .llseek = seq_lseek, 3108 .release = seq_release_net, 3109 }; 3110 3111 static int __net_init if6_proc_net_init(struct net *net) 3112 { 3113 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3114 return -ENOMEM; 3115 return 0; 3116 } 3117 3118 static void __net_exit if6_proc_net_exit(struct net *net) 3119 { 3120 proc_net_remove(net, "if_inet6"); 3121 } 3122 3123 static struct pernet_operations if6_proc_net_ops = { 3124 .init = if6_proc_net_init, 3125 .exit = if6_proc_net_exit, 3126 }; 3127 3128 int __init if6_proc_init(void) 3129 { 3130 return register_pernet_subsys(&if6_proc_net_ops); 3131 } 3132 3133 void if6_proc_exit(void) 3134 { 3135 unregister_pernet_subsys(&if6_proc_net_ops); 3136 } 3137 #endif /* CONFIG_PROC_FS */ 3138 3139 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3140 /* Check if address is a home address configured on any interface. */ 3141 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3142 { 3143 int ret = 0; 3144 struct inet6_ifaddr *ifp = NULL; 3145 struct hlist_node *n; 3146 unsigned int hash = ipv6_addr_hash(addr); 3147 3148 rcu_read_lock_bh(); 3149 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3150 if (!net_eq(dev_net(ifp->idev->dev), net)) 3151 continue; 3152 if (ipv6_addr_equal(&ifp->addr, addr) && 3153 (ifp->flags & IFA_F_HOMEADDRESS)) { 3154 ret = 1; 3155 break; 3156 } 3157 } 3158 rcu_read_unlock_bh(); 3159 return ret; 3160 } 3161 #endif 3162 3163 /* 3164 * Periodic address status verification 3165 */ 3166 3167 static void addrconf_verify(unsigned long foo) 3168 { 3169 unsigned long now, next, next_sec, next_sched; 3170 struct inet6_ifaddr *ifp; 3171 struct hlist_node *node; 3172 int i; 3173 3174 rcu_read_lock_bh(); 3175 spin_lock(&addrconf_verify_lock); 3176 now = jiffies; 3177 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3178 3179 del_timer(&addr_chk_timer); 3180 3181 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3182 restart: 3183 hlist_for_each_entry_rcu_bh(ifp, node, 3184 &inet6_addr_lst[i], addr_lst) { 3185 unsigned long age; 3186 3187 if (ifp->flags & IFA_F_PERMANENT) 3188 continue; 3189 3190 spin_lock(&ifp->lock); 3191 /* We try to batch several events at once. */ 3192 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3193 3194 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3195 age >= ifp->valid_lft) { 3196 spin_unlock(&ifp->lock); 3197 in6_ifa_hold(ifp); 3198 ipv6_del_addr(ifp); 3199 goto restart; 3200 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3201 spin_unlock(&ifp->lock); 3202 continue; 3203 } else if (age >= ifp->prefered_lft) { 3204 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3205 int deprecate = 0; 3206 3207 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3208 deprecate = 1; 3209 ifp->flags |= IFA_F_DEPRECATED; 3210 } 3211 3212 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3213 next = ifp->tstamp + ifp->valid_lft * HZ; 3214 3215 spin_unlock(&ifp->lock); 3216 3217 if (deprecate) { 3218 in6_ifa_hold(ifp); 3219 3220 ipv6_ifa_notify(0, ifp); 3221 in6_ifa_put(ifp); 3222 goto restart; 3223 } 3224 #ifdef CONFIG_IPV6_PRIVACY 3225 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3226 !(ifp->flags&IFA_F_TENTATIVE)) { 3227 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3228 ifp->idev->cnf.dad_transmits * 3229 ifp->idev->nd_parms->retrans_time / HZ; 3230 3231 if (age >= ifp->prefered_lft - regen_advance) { 3232 struct inet6_ifaddr *ifpub = ifp->ifpub; 3233 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3234 next = ifp->tstamp + ifp->prefered_lft * HZ; 3235 if (!ifp->regen_count && ifpub) { 3236 ifp->regen_count++; 3237 in6_ifa_hold(ifp); 3238 in6_ifa_hold(ifpub); 3239 spin_unlock(&ifp->lock); 3240 3241 spin_lock(&ifpub->lock); 3242 ifpub->regen_count = 0; 3243 spin_unlock(&ifpub->lock); 3244 ipv6_create_tempaddr(ifpub, ifp); 3245 in6_ifa_put(ifpub); 3246 in6_ifa_put(ifp); 3247 goto restart; 3248 } 3249 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3250 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3251 spin_unlock(&ifp->lock); 3252 #endif 3253 } else { 3254 /* ifp->prefered_lft <= ifp->valid_lft */ 3255 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3256 next = ifp->tstamp + ifp->prefered_lft * HZ; 3257 spin_unlock(&ifp->lock); 3258 } 3259 } 3260 } 3261 3262 next_sec = round_jiffies_up(next); 3263 next_sched = next; 3264 3265 /* If rounded timeout is accurate enough, accept it. */ 3266 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3267 next_sched = next_sec; 3268 3269 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3270 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3271 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3272 3273 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3274 now, next, next_sec, next_sched)); 3275 3276 addr_chk_timer.expires = next_sched; 3277 add_timer(&addr_chk_timer); 3278 spin_unlock(&addrconf_verify_lock); 3279 rcu_read_unlock_bh(); 3280 } 3281 3282 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3283 { 3284 struct in6_addr *pfx = NULL; 3285 3286 if (addr) 3287 pfx = nla_data(addr); 3288 3289 if (local) { 3290 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3291 pfx = NULL; 3292 else 3293 pfx = nla_data(local); 3294 } 3295 3296 return pfx; 3297 } 3298 3299 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3300 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3301 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3302 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3303 }; 3304 3305 static int 3306 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3307 { 3308 struct net *net = sock_net(skb->sk); 3309 struct ifaddrmsg *ifm; 3310 struct nlattr *tb[IFA_MAX+1]; 3311 struct in6_addr *pfx; 3312 int err; 3313 3314 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3315 if (err < 0) 3316 return err; 3317 3318 ifm = nlmsg_data(nlh); 3319 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3320 if (pfx == NULL) 3321 return -EINVAL; 3322 3323 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3324 } 3325 3326 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3327 u32 prefered_lft, u32 valid_lft) 3328 { 3329 u32 flags; 3330 clock_t expires; 3331 unsigned long timeout; 3332 3333 if (!valid_lft || (prefered_lft > valid_lft)) 3334 return -EINVAL; 3335 3336 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3337 if (addrconf_finite_timeout(timeout)) { 3338 expires = jiffies_to_clock_t(timeout * HZ); 3339 valid_lft = timeout; 3340 flags = RTF_EXPIRES; 3341 } else { 3342 expires = 0; 3343 flags = 0; 3344 ifa_flags |= IFA_F_PERMANENT; 3345 } 3346 3347 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3348 if (addrconf_finite_timeout(timeout)) { 3349 if (timeout == 0) 3350 ifa_flags |= IFA_F_DEPRECATED; 3351 prefered_lft = timeout; 3352 } 3353 3354 spin_lock_bh(&ifp->lock); 3355 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3356 ifp->tstamp = jiffies; 3357 ifp->valid_lft = valid_lft; 3358 ifp->prefered_lft = prefered_lft; 3359 3360 spin_unlock_bh(&ifp->lock); 3361 if (!(ifp->flags&IFA_F_TENTATIVE)) 3362 ipv6_ifa_notify(0, ifp); 3363 3364 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3365 expires, flags); 3366 addrconf_verify(0); 3367 3368 return 0; 3369 } 3370 3371 static int 3372 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3373 { 3374 struct net *net = sock_net(skb->sk); 3375 struct ifaddrmsg *ifm; 3376 struct nlattr *tb[IFA_MAX+1]; 3377 struct in6_addr *pfx; 3378 struct inet6_ifaddr *ifa; 3379 struct net_device *dev; 3380 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3381 u8 ifa_flags; 3382 int err; 3383 3384 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3385 if (err < 0) 3386 return err; 3387 3388 ifm = nlmsg_data(nlh); 3389 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3390 if (pfx == NULL) 3391 return -EINVAL; 3392 3393 if (tb[IFA_CACHEINFO]) { 3394 struct ifa_cacheinfo *ci; 3395 3396 ci = nla_data(tb[IFA_CACHEINFO]); 3397 valid_lft = ci->ifa_valid; 3398 preferred_lft = ci->ifa_prefered; 3399 } else { 3400 preferred_lft = INFINITY_LIFE_TIME; 3401 valid_lft = INFINITY_LIFE_TIME; 3402 } 3403 3404 dev = __dev_get_by_index(net, ifm->ifa_index); 3405 if (dev == NULL) 3406 return -ENODEV; 3407 3408 /* We ignore other flags so far. */ 3409 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3410 3411 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3412 if (ifa == NULL) { 3413 /* 3414 * It would be best to check for !NLM_F_CREATE here but 3415 * userspace alreay relies on not having to provide this. 3416 */ 3417 return inet6_addr_add(net, ifm->ifa_index, pfx, 3418 ifm->ifa_prefixlen, ifa_flags, 3419 preferred_lft, valid_lft); 3420 } 3421 3422 if (nlh->nlmsg_flags & NLM_F_EXCL || 3423 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3424 err = -EEXIST; 3425 else 3426 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3427 3428 in6_ifa_put(ifa); 3429 3430 return err; 3431 } 3432 3433 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3434 u8 scope, int ifindex) 3435 { 3436 struct ifaddrmsg *ifm; 3437 3438 ifm = nlmsg_data(nlh); 3439 ifm->ifa_family = AF_INET6; 3440 ifm->ifa_prefixlen = prefixlen; 3441 ifm->ifa_flags = flags; 3442 ifm->ifa_scope = scope; 3443 ifm->ifa_index = ifindex; 3444 } 3445 3446 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3447 unsigned long tstamp, u32 preferred, u32 valid) 3448 { 3449 struct ifa_cacheinfo ci; 3450 3451 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3452 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3453 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3454 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3455 ci.ifa_prefered = preferred; 3456 ci.ifa_valid = valid; 3457 3458 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3459 } 3460 3461 static inline int rt_scope(int ifa_scope) 3462 { 3463 if (ifa_scope & IFA_HOST) 3464 return RT_SCOPE_HOST; 3465 else if (ifa_scope & IFA_LINK) 3466 return RT_SCOPE_LINK; 3467 else if (ifa_scope & IFA_SITE) 3468 return RT_SCOPE_SITE; 3469 else 3470 return RT_SCOPE_UNIVERSE; 3471 } 3472 3473 static inline int inet6_ifaddr_msgsize(void) 3474 { 3475 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3476 + nla_total_size(16) /* IFA_ADDRESS */ 3477 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3478 } 3479 3480 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3481 u32 pid, u32 seq, int event, unsigned int flags) 3482 { 3483 struct nlmsghdr *nlh; 3484 u32 preferred, valid; 3485 3486 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3487 if (nlh == NULL) 3488 return -EMSGSIZE; 3489 3490 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3491 ifa->idev->dev->ifindex); 3492 3493 if (!(ifa->flags&IFA_F_PERMANENT)) { 3494 preferred = ifa->prefered_lft; 3495 valid = ifa->valid_lft; 3496 if (preferred != INFINITY_LIFE_TIME) { 3497 long tval = (jiffies - ifa->tstamp)/HZ; 3498 if (preferred > tval) 3499 preferred -= tval; 3500 else 3501 preferred = 0; 3502 if (valid != INFINITY_LIFE_TIME) { 3503 if (valid > tval) 3504 valid -= tval; 3505 else 3506 valid = 0; 3507 } 3508 } 3509 } else { 3510 preferred = INFINITY_LIFE_TIME; 3511 valid = INFINITY_LIFE_TIME; 3512 } 3513 3514 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3515 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3516 nlmsg_cancel(skb, nlh); 3517 return -EMSGSIZE; 3518 } 3519 3520 return nlmsg_end(skb, nlh); 3521 } 3522 3523 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3524 u32 pid, u32 seq, int event, u16 flags) 3525 { 3526 struct nlmsghdr *nlh; 3527 u8 scope = RT_SCOPE_UNIVERSE; 3528 int ifindex = ifmca->idev->dev->ifindex; 3529 3530 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3531 scope = RT_SCOPE_SITE; 3532 3533 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3534 if (nlh == NULL) 3535 return -EMSGSIZE; 3536 3537 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3538 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3539 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3540 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3541 nlmsg_cancel(skb, nlh); 3542 return -EMSGSIZE; 3543 } 3544 3545 return nlmsg_end(skb, nlh); 3546 } 3547 3548 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3549 u32 pid, u32 seq, int event, unsigned int flags) 3550 { 3551 struct nlmsghdr *nlh; 3552 u8 scope = RT_SCOPE_UNIVERSE; 3553 int ifindex = ifaca->aca_idev->dev->ifindex; 3554 3555 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3556 scope = RT_SCOPE_SITE; 3557 3558 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3559 if (nlh == NULL) 3560 return -EMSGSIZE; 3561 3562 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3563 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3564 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3565 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3566 nlmsg_cancel(skb, nlh); 3567 return -EMSGSIZE; 3568 } 3569 3570 return nlmsg_end(skb, nlh); 3571 } 3572 3573 enum addr_type_t { 3574 UNICAST_ADDR, 3575 MULTICAST_ADDR, 3576 ANYCAST_ADDR, 3577 }; 3578 3579 /* called with rcu_read_lock() */ 3580 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3581 struct netlink_callback *cb, enum addr_type_t type, 3582 int s_ip_idx, int *p_ip_idx) 3583 { 3584 struct ifmcaddr6 *ifmca; 3585 struct ifacaddr6 *ifaca; 3586 int err = 1; 3587 int ip_idx = *p_ip_idx; 3588 3589 read_lock_bh(&idev->lock); 3590 switch (type) { 3591 case UNICAST_ADDR: { 3592 struct inet6_ifaddr *ifa; 3593 3594 /* unicast address incl. temp addr */ 3595 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3596 if (++ip_idx < s_ip_idx) 3597 continue; 3598 err = inet6_fill_ifaddr(skb, ifa, 3599 NETLINK_CB(cb->skb).pid, 3600 cb->nlh->nlmsg_seq, 3601 RTM_NEWADDR, 3602 NLM_F_MULTI); 3603 if (err <= 0) 3604 break; 3605 } 3606 break; 3607 } 3608 case MULTICAST_ADDR: 3609 /* multicast address */ 3610 for (ifmca = idev->mc_list; ifmca; 3611 ifmca = ifmca->next, ip_idx++) { 3612 if (ip_idx < s_ip_idx) 3613 continue; 3614 err = inet6_fill_ifmcaddr(skb, ifmca, 3615 NETLINK_CB(cb->skb).pid, 3616 cb->nlh->nlmsg_seq, 3617 RTM_GETMULTICAST, 3618 NLM_F_MULTI); 3619 if (err <= 0) 3620 break; 3621 } 3622 break; 3623 case ANYCAST_ADDR: 3624 /* anycast address */ 3625 for (ifaca = idev->ac_list; ifaca; 3626 ifaca = ifaca->aca_next, ip_idx++) { 3627 if (ip_idx < s_ip_idx) 3628 continue; 3629 err = inet6_fill_ifacaddr(skb, ifaca, 3630 NETLINK_CB(cb->skb).pid, 3631 cb->nlh->nlmsg_seq, 3632 RTM_GETANYCAST, 3633 NLM_F_MULTI); 3634 if (err <= 0) 3635 break; 3636 } 3637 break; 3638 default: 3639 break; 3640 } 3641 read_unlock_bh(&idev->lock); 3642 *p_ip_idx = ip_idx; 3643 return err; 3644 } 3645 3646 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3647 enum addr_type_t type) 3648 { 3649 struct net *net = sock_net(skb->sk); 3650 int h, s_h; 3651 int idx, ip_idx; 3652 int s_idx, s_ip_idx; 3653 struct net_device *dev; 3654 struct inet6_dev *idev; 3655 struct hlist_head *head; 3656 struct hlist_node *node; 3657 3658 s_h = cb->args[0]; 3659 s_idx = idx = cb->args[1]; 3660 s_ip_idx = ip_idx = cb->args[2]; 3661 3662 rcu_read_lock(); 3663 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3664 idx = 0; 3665 head = &net->dev_index_head[h]; 3666 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3667 if (idx < s_idx) 3668 goto cont; 3669 if (h > s_h || idx > s_idx) 3670 s_ip_idx = 0; 3671 ip_idx = 0; 3672 idev = __in6_dev_get(dev); 3673 if (!idev) 3674 goto cont; 3675 3676 if (in6_dump_addrs(idev, skb, cb, type, 3677 s_ip_idx, &ip_idx) <= 0) 3678 goto done; 3679 cont: 3680 idx++; 3681 } 3682 } 3683 done: 3684 rcu_read_unlock(); 3685 cb->args[0] = h; 3686 cb->args[1] = idx; 3687 cb->args[2] = ip_idx; 3688 3689 return skb->len; 3690 } 3691 3692 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3693 { 3694 enum addr_type_t type = UNICAST_ADDR; 3695 3696 return inet6_dump_addr(skb, cb, type); 3697 } 3698 3699 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3700 { 3701 enum addr_type_t type = MULTICAST_ADDR; 3702 3703 return inet6_dump_addr(skb, cb, type); 3704 } 3705 3706 3707 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3708 { 3709 enum addr_type_t type = ANYCAST_ADDR; 3710 3711 return inet6_dump_addr(skb, cb, type); 3712 } 3713 3714 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3715 void *arg) 3716 { 3717 struct net *net = sock_net(in_skb->sk); 3718 struct ifaddrmsg *ifm; 3719 struct nlattr *tb[IFA_MAX+1]; 3720 struct in6_addr *addr = NULL; 3721 struct net_device *dev = NULL; 3722 struct inet6_ifaddr *ifa; 3723 struct sk_buff *skb; 3724 int err; 3725 3726 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3727 if (err < 0) 3728 goto errout; 3729 3730 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3731 if (addr == NULL) { 3732 err = -EINVAL; 3733 goto errout; 3734 } 3735 3736 ifm = nlmsg_data(nlh); 3737 if (ifm->ifa_index) 3738 dev = __dev_get_by_index(net, ifm->ifa_index); 3739 3740 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3741 if (!ifa) { 3742 err = -EADDRNOTAVAIL; 3743 goto errout; 3744 } 3745 3746 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3747 if (!skb) { 3748 err = -ENOBUFS; 3749 goto errout_ifa; 3750 } 3751 3752 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3753 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3754 if (err < 0) { 3755 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3756 WARN_ON(err == -EMSGSIZE); 3757 kfree_skb(skb); 3758 goto errout_ifa; 3759 } 3760 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3761 errout_ifa: 3762 in6_ifa_put(ifa); 3763 errout: 3764 return err; 3765 } 3766 3767 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3768 { 3769 struct sk_buff *skb; 3770 struct net *net = dev_net(ifa->idev->dev); 3771 int err = -ENOBUFS; 3772 3773 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3774 if (skb == NULL) 3775 goto errout; 3776 3777 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3778 if (err < 0) { 3779 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3780 WARN_ON(err == -EMSGSIZE); 3781 kfree_skb(skb); 3782 goto errout; 3783 } 3784 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3785 return; 3786 errout: 3787 if (err < 0) 3788 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3789 } 3790 3791 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3792 __s32 *array, int bytes) 3793 { 3794 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3795 3796 memset(array, 0, bytes); 3797 array[DEVCONF_FORWARDING] = cnf->forwarding; 3798 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3799 array[DEVCONF_MTU6] = cnf->mtu6; 3800 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3801 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3802 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3803 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3804 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3805 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3806 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3807 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3808 #ifdef CONFIG_IPV6_PRIVACY 3809 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3810 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3811 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3812 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3813 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3814 #endif 3815 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3816 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3817 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3818 #ifdef CONFIG_IPV6_ROUTER_PREF 3819 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3820 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3821 #ifdef CONFIG_IPV6_ROUTE_INFO 3822 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3823 #endif 3824 #endif 3825 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3826 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3827 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3828 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3829 #endif 3830 #ifdef CONFIG_IPV6_MROUTE 3831 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3832 #endif 3833 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3834 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3835 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3836 } 3837 3838 static inline size_t inet6_if_nlmsg_size(void) 3839 { 3840 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3841 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3842 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3843 + nla_total_size(4) /* IFLA_MTU */ 3844 + nla_total_size(4) /* IFLA_LINK */ 3845 + nla_total_size( /* IFLA_PROTINFO */ 3846 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3847 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3848 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3849 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3850 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3851 ); 3852 } 3853 3854 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib, 3855 int items, int bytes) 3856 { 3857 int i; 3858 int pad = bytes - sizeof(u64) * items; 3859 BUG_ON(pad < 0); 3860 3861 /* Use put_unaligned() because stats may not be aligned for u64. */ 3862 put_unaligned(items, &stats[0]); 3863 for (i = 1; i < items; i++) 3864 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3865 3866 memset(&stats[items], 0, pad); 3867 } 3868 3869 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3870 int items, int bytes, size_t syncpoff) 3871 { 3872 int i; 3873 int pad = bytes - sizeof(u64) * items; 3874 BUG_ON(pad < 0); 3875 3876 /* Use put_unaligned() because stats may not be aligned for u64. */ 3877 put_unaligned(items, &stats[0]); 3878 for (i = 1; i < items; i++) 3879 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3880 3881 memset(&stats[items], 0, pad); 3882 } 3883 3884 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3885 int bytes) 3886 { 3887 switch (attrtype) { 3888 case IFLA_INET6_STATS: 3889 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3890 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3891 break; 3892 case IFLA_INET6_ICMP6STATS: 3893 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3894 break; 3895 } 3896 } 3897 3898 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3899 u32 pid, u32 seq, int event, unsigned int flags) 3900 { 3901 struct net_device *dev = idev->dev; 3902 struct nlattr *nla; 3903 struct ifinfomsg *hdr; 3904 struct nlmsghdr *nlh; 3905 void *protoinfo; 3906 struct ifla_cacheinfo ci; 3907 3908 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3909 if (nlh == NULL) 3910 return -EMSGSIZE; 3911 3912 hdr = nlmsg_data(nlh); 3913 hdr->ifi_family = AF_INET6; 3914 hdr->__ifi_pad = 0; 3915 hdr->ifi_type = dev->type; 3916 hdr->ifi_index = dev->ifindex; 3917 hdr->ifi_flags = dev_get_flags(dev); 3918 hdr->ifi_change = 0; 3919 3920 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3921 3922 if (dev->addr_len) 3923 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3924 3925 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3926 if (dev->ifindex != dev->iflink) 3927 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3928 3929 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3930 if (protoinfo == NULL) 3931 goto nla_put_failure; 3932 3933 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3934 3935 ci.max_reasm_len = IPV6_MAXPLEN; 3936 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3937 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3938 ci.reachable_time = idev->nd_parms->reachable_time; 3939 ci.retrans_time = idev->nd_parms->retrans_time; 3940 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3941 3942 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3943 if (nla == NULL) 3944 goto nla_put_failure; 3945 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3946 3947 /* XXX - MC not implemented */ 3948 3949 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3950 if (nla == NULL) 3951 goto nla_put_failure; 3952 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3953 3954 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3955 if (nla == NULL) 3956 goto nla_put_failure; 3957 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3958 3959 nla_nest_end(skb, protoinfo); 3960 return nlmsg_end(skb, nlh); 3961 3962 nla_put_failure: 3963 nlmsg_cancel(skb, nlh); 3964 return -EMSGSIZE; 3965 } 3966 3967 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3968 { 3969 struct net *net = sock_net(skb->sk); 3970 int h, s_h; 3971 int idx = 0, s_idx; 3972 struct net_device *dev; 3973 struct inet6_dev *idev; 3974 struct hlist_head *head; 3975 struct hlist_node *node; 3976 3977 s_h = cb->args[0]; 3978 s_idx = cb->args[1]; 3979 3980 rcu_read_lock(); 3981 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3982 idx = 0; 3983 head = &net->dev_index_head[h]; 3984 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3985 if (idx < s_idx) 3986 goto cont; 3987 idev = __in6_dev_get(dev); 3988 if (!idev) 3989 goto cont; 3990 if (inet6_fill_ifinfo(skb, idev, 3991 NETLINK_CB(cb->skb).pid, 3992 cb->nlh->nlmsg_seq, 3993 RTM_NEWLINK, NLM_F_MULTI) <= 0) 3994 goto out; 3995 cont: 3996 idx++; 3997 } 3998 } 3999 out: 4000 rcu_read_unlock(); 4001 cb->args[1] = idx; 4002 cb->args[0] = h; 4003 4004 return skb->len; 4005 } 4006 4007 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4008 { 4009 struct sk_buff *skb; 4010 struct net *net = dev_net(idev->dev); 4011 int err = -ENOBUFS; 4012 4013 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4014 if (skb == NULL) 4015 goto errout; 4016 4017 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4018 if (err < 0) { 4019 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4020 WARN_ON(err == -EMSGSIZE); 4021 kfree_skb(skb); 4022 goto errout; 4023 } 4024 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4025 return; 4026 errout: 4027 if (err < 0) 4028 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4029 } 4030 4031 static inline size_t inet6_prefix_nlmsg_size(void) 4032 { 4033 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4034 + nla_total_size(sizeof(struct in6_addr)) 4035 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4036 } 4037 4038 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4039 struct prefix_info *pinfo, u32 pid, u32 seq, 4040 int event, unsigned int flags) 4041 { 4042 struct prefixmsg *pmsg; 4043 struct nlmsghdr *nlh; 4044 struct prefix_cacheinfo ci; 4045 4046 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4047 if (nlh == NULL) 4048 return -EMSGSIZE; 4049 4050 pmsg = nlmsg_data(nlh); 4051 pmsg->prefix_family = AF_INET6; 4052 pmsg->prefix_pad1 = 0; 4053 pmsg->prefix_pad2 = 0; 4054 pmsg->prefix_ifindex = idev->dev->ifindex; 4055 pmsg->prefix_len = pinfo->prefix_len; 4056 pmsg->prefix_type = pinfo->type; 4057 pmsg->prefix_pad3 = 0; 4058 pmsg->prefix_flags = 0; 4059 if (pinfo->onlink) 4060 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4061 if (pinfo->autoconf) 4062 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4063 4064 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4065 4066 ci.preferred_time = ntohl(pinfo->prefered); 4067 ci.valid_time = ntohl(pinfo->valid); 4068 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4069 4070 return nlmsg_end(skb, nlh); 4071 4072 nla_put_failure: 4073 nlmsg_cancel(skb, nlh); 4074 return -EMSGSIZE; 4075 } 4076 4077 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4078 struct prefix_info *pinfo) 4079 { 4080 struct sk_buff *skb; 4081 struct net *net = dev_net(idev->dev); 4082 int err = -ENOBUFS; 4083 4084 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4085 if (skb == NULL) 4086 goto errout; 4087 4088 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4089 if (err < 0) { 4090 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4091 WARN_ON(err == -EMSGSIZE); 4092 kfree_skb(skb); 4093 goto errout; 4094 } 4095 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4096 return; 4097 errout: 4098 if (err < 0) 4099 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4100 } 4101 4102 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4103 { 4104 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4105 4106 switch (event) { 4107 case RTM_NEWADDR: 4108 /* 4109 * If the address was optimistic 4110 * we inserted the route at the start of 4111 * our DAD process, so we don't need 4112 * to do it again 4113 */ 4114 if (!(ifp->rt->rt6i_node)) 4115 ip6_ins_rt(ifp->rt); 4116 if (ifp->idev->cnf.forwarding) 4117 addrconf_join_anycast(ifp); 4118 break; 4119 case RTM_DELADDR: 4120 if (ifp->idev->cnf.forwarding) 4121 addrconf_leave_anycast(ifp); 4122 addrconf_leave_solict(ifp->idev, &ifp->addr); 4123 dst_hold(&ifp->rt->dst); 4124 4125 if (ifp->state == INET6_IFADDR_STATE_DEAD && 4126 ip6_del_rt(ifp->rt)) 4127 dst_free(&ifp->rt->dst); 4128 break; 4129 } 4130 } 4131 4132 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4133 { 4134 rcu_read_lock_bh(); 4135 if (likely(ifp->idev->dead == 0)) 4136 __ipv6_ifa_notify(event, ifp); 4137 rcu_read_unlock_bh(); 4138 } 4139 4140 #ifdef CONFIG_SYSCTL 4141 4142 static 4143 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4144 void __user *buffer, size_t *lenp, loff_t *ppos) 4145 { 4146 int *valp = ctl->data; 4147 int val = *valp; 4148 loff_t pos = *ppos; 4149 int ret; 4150 4151 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4152 4153 if (write) 4154 ret = addrconf_fixup_forwarding(ctl, valp, val); 4155 if (ret) 4156 *ppos = pos; 4157 return ret; 4158 } 4159 4160 static void dev_disable_change(struct inet6_dev *idev) 4161 { 4162 if (!idev || !idev->dev) 4163 return; 4164 4165 if (idev->cnf.disable_ipv6) 4166 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4167 else 4168 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4169 } 4170 4171 static void addrconf_disable_change(struct net *net, __s32 newf) 4172 { 4173 struct net_device *dev; 4174 struct inet6_dev *idev; 4175 4176 rcu_read_lock(); 4177 for_each_netdev_rcu(net, dev) { 4178 idev = __in6_dev_get(dev); 4179 if (idev) { 4180 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4181 idev->cnf.disable_ipv6 = newf; 4182 if (changed) 4183 dev_disable_change(idev); 4184 } 4185 } 4186 rcu_read_unlock(); 4187 } 4188 4189 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4190 { 4191 struct net *net; 4192 4193 net = (struct net *)table->extra2; 4194 4195 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4196 return 0; 4197 4198 if (!rtnl_trylock()) { 4199 /* Restore the original values before restarting */ 4200 *p = old; 4201 return restart_syscall(); 4202 } 4203 4204 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4205 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4206 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4207 addrconf_disable_change(net, newf); 4208 } else if ((!*p) ^ (!old)) 4209 dev_disable_change((struct inet6_dev *)table->extra1); 4210 4211 rtnl_unlock(); 4212 return 0; 4213 } 4214 4215 static 4216 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4217 void __user *buffer, size_t *lenp, loff_t *ppos) 4218 { 4219 int *valp = ctl->data; 4220 int val = *valp; 4221 loff_t pos = *ppos; 4222 int ret; 4223 4224 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4225 4226 if (write) 4227 ret = addrconf_disable_ipv6(ctl, valp, val); 4228 if (ret) 4229 *ppos = pos; 4230 return ret; 4231 } 4232 4233 static struct addrconf_sysctl_table 4234 { 4235 struct ctl_table_header *sysctl_header; 4236 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4237 char *dev_name; 4238 } addrconf_sysctl __read_mostly = { 4239 .sysctl_header = NULL, 4240 .addrconf_vars = { 4241 { 4242 .procname = "forwarding", 4243 .data = &ipv6_devconf.forwarding, 4244 .maxlen = sizeof(int), 4245 .mode = 0644, 4246 .proc_handler = addrconf_sysctl_forward, 4247 }, 4248 { 4249 .procname = "hop_limit", 4250 .data = &ipv6_devconf.hop_limit, 4251 .maxlen = sizeof(int), 4252 .mode = 0644, 4253 .proc_handler = proc_dointvec, 4254 }, 4255 { 4256 .procname = "mtu", 4257 .data = &ipv6_devconf.mtu6, 4258 .maxlen = sizeof(int), 4259 .mode = 0644, 4260 .proc_handler = proc_dointvec, 4261 }, 4262 { 4263 .procname = "accept_ra", 4264 .data = &ipv6_devconf.accept_ra, 4265 .maxlen = sizeof(int), 4266 .mode = 0644, 4267 .proc_handler = proc_dointvec, 4268 }, 4269 { 4270 .procname = "accept_redirects", 4271 .data = &ipv6_devconf.accept_redirects, 4272 .maxlen = sizeof(int), 4273 .mode = 0644, 4274 .proc_handler = proc_dointvec, 4275 }, 4276 { 4277 .procname = "autoconf", 4278 .data = &ipv6_devconf.autoconf, 4279 .maxlen = sizeof(int), 4280 .mode = 0644, 4281 .proc_handler = proc_dointvec, 4282 }, 4283 { 4284 .procname = "dad_transmits", 4285 .data = &ipv6_devconf.dad_transmits, 4286 .maxlen = sizeof(int), 4287 .mode = 0644, 4288 .proc_handler = proc_dointvec, 4289 }, 4290 { 4291 .procname = "router_solicitations", 4292 .data = &ipv6_devconf.rtr_solicits, 4293 .maxlen = sizeof(int), 4294 .mode = 0644, 4295 .proc_handler = proc_dointvec, 4296 }, 4297 { 4298 .procname = "router_solicitation_interval", 4299 .data = &ipv6_devconf.rtr_solicit_interval, 4300 .maxlen = sizeof(int), 4301 .mode = 0644, 4302 .proc_handler = proc_dointvec_jiffies, 4303 }, 4304 { 4305 .procname = "router_solicitation_delay", 4306 .data = &ipv6_devconf.rtr_solicit_delay, 4307 .maxlen = sizeof(int), 4308 .mode = 0644, 4309 .proc_handler = proc_dointvec_jiffies, 4310 }, 4311 { 4312 .procname = "force_mld_version", 4313 .data = &ipv6_devconf.force_mld_version, 4314 .maxlen = sizeof(int), 4315 .mode = 0644, 4316 .proc_handler = proc_dointvec, 4317 }, 4318 #ifdef CONFIG_IPV6_PRIVACY 4319 { 4320 .procname = "use_tempaddr", 4321 .data = &ipv6_devconf.use_tempaddr, 4322 .maxlen = sizeof(int), 4323 .mode = 0644, 4324 .proc_handler = proc_dointvec, 4325 }, 4326 { 4327 .procname = "temp_valid_lft", 4328 .data = &ipv6_devconf.temp_valid_lft, 4329 .maxlen = sizeof(int), 4330 .mode = 0644, 4331 .proc_handler = proc_dointvec, 4332 }, 4333 { 4334 .procname = "temp_prefered_lft", 4335 .data = &ipv6_devconf.temp_prefered_lft, 4336 .maxlen = sizeof(int), 4337 .mode = 0644, 4338 .proc_handler = proc_dointvec, 4339 }, 4340 { 4341 .procname = "regen_max_retry", 4342 .data = &ipv6_devconf.regen_max_retry, 4343 .maxlen = sizeof(int), 4344 .mode = 0644, 4345 .proc_handler = proc_dointvec, 4346 }, 4347 { 4348 .procname = "max_desync_factor", 4349 .data = &ipv6_devconf.max_desync_factor, 4350 .maxlen = sizeof(int), 4351 .mode = 0644, 4352 .proc_handler = proc_dointvec, 4353 }, 4354 #endif 4355 { 4356 .procname = "max_addresses", 4357 .data = &ipv6_devconf.max_addresses, 4358 .maxlen = sizeof(int), 4359 .mode = 0644, 4360 .proc_handler = proc_dointvec, 4361 }, 4362 { 4363 .procname = "accept_ra_defrtr", 4364 .data = &ipv6_devconf.accept_ra_defrtr, 4365 .maxlen = sizeof(int), 4366 .mode = 0644, 4367 .proc_handler = proc_dointvec, 4368 }, 4369 { 4370 .procname = "accept_ra_pinfo", 4371 .data = &ipv6_devconf.accept_ra_pinfo, 4372 .maxlen = sizeof(int), 4373 .mode = 0644, 4374 .proc_handler = proc_dointvec, 4375 }, 4376 #ifdef CONFIG_IPV6_ROUTER_PREF 4377 { 4378 .procname = "accept_ra_rtr_pref", 4379 .data = &ipv6_devconf.accept_ra_rtr_pref, 4380 .maxlen = sizeof(int), 4381 .mode = 0644, 4382 .proc_handler = proc_dointvec, 4383 }, 4384 { 4385 .procname = "router_probe_interval", 4386 .data = &ipv6_devconf.rtr_probe_interval, 4387 .maxlen = sizeof(int), 4388 .mode = 0644, 4389 .proc_handler = proc_dointvec_jiffies, 4390 }, 4391 #ifdef CONFIG_IPV6_ROUTE_INFO 4392 { 4393 .procname = "accept_ra_rt_info_max_plen", 4394 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4395 .maxlen = sizeof(int), 4396 .mode = 0644, 4397 .proc_handler = proc_dointvec, 4398 }, 4399 #endif 4400 #endif 4401 { 4402 .procname = "proxy_ndp", 4403 .data = &ipv6_devconf.proxy_ndp, 4404 .maxlen = sizeof(int), 4405 .mode = 0644, 4406 .proc_handler = proc_dointvec, 4407 }, 4408 { 4409 .procname = "accept_source_route", 4410 .data = &ipv6_devconf.accept_source_route, 4411 .maxlen = sizeof(int), 4412 .mode = 0644, 4413 .proc_handler = proc_dointvec, 4414 }, 4415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4416 { 4417 .procname = "optimistic_dad", 4418 .data = &ipv6_devconf.optimistic_dad, 4419 .maxlen = sizeof(int), 4420 .mode = 0644, 4421 .proc_handler = proc_dointvec, 4422 4423 }, 4424 #endif 4425 #ifdef CONFIG_IPV6_MROUTE 4426 { 4427 .procname = "mc_forwarding", 4428 .data = &ipv6_devconf.mc_forwarding, 4429 .maxlen = sizeof(int), 4430 .mode = 0444, 4431 .proc_handler = proc_dointvec, 4432 }, 4433 #endif 4434 { 4435 .procname = "disable_ipv6", 4436 .data = &ipv6_devconf.disable_ipv6, 4437 .maxlen = sizeof(int), 4438 .mode = 0644, 4439 .proc_handler = addrconf_sysctl_disable, 4440 }, 4441 { 4442 .procname = "accept_dad", 4443 .data = &ipv6_devconf.accept_dad, 4444 .maxlen = sizeof(int), 4445 .mode = 0644, 4446 .proc_handler = proc_dointvec, 4447 }, 4448 { 4449 .procname = "force_tllao", 4450 .data = &ipv6_devconf.force_tllao, 4451 .maxlen = sizeof(int), 4452 .mode = 0644, 4453 .proc_handler = proc_dointvec 4454 }, 4455 { 4456 /* sentinel */ 4457 } 4458 }, 4459 }; 4460 4461 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4462 struct inet6_dev *idev, struct ipv6_devconf *p) 4463 { 4464 int i; 4465 struct addrconf_sysctl_table *t; 4466 4467 #define ADDRCONF_CTL_PATH_DEV 3 4468 4469 struct ctl_path addrconf_ctl_path[] = { 4470 { .procname = "net", }, 4471 { .procname = "ipv6", }, 4472 { .procname = "conf", }, 4473 { /* to be set */ }, 4474 { }, 4475 }; 4476 4477 4478 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4479 if (t == NULL) 4480 goto out; 4481 4482 for (i = 0; t->addrconf_vars[i].data; i++) { 4483 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4484 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4485 t->addrconf_vars[i].extra2 = net; 4486 } 4487 4488 /* 4489 * Make a copy of dev_name, because '.procname' is regarded as const 4490 * by sysctl and we wouldn't want anyone to change it under our feet 4491 * (see SIOCSIFNAME). 4492 */ 4493 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4494 if (!t->dev_name) 4495 goto free; 4496 4497 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4498 4499 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4500 t->addrconf_vars); 4501 if (t->sysctl_header == NULL) 4502 goto free_procname; 4503 4504 p->sysctl = t; 4505 return 0; 4506 4507 free_procname: 4508 kfree(t->dev_name); 4509 free: 4510 kfree(t); 4511 out: 4512 return -ENOBUFS; 4513 } 4514 4515 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4516 { 4517 struct addrconf_sysctl_table *t; 4518 4519 if (p->sysctl == NULL) 4520 return; 4521 4522 t = p->sysctl; 4523 p->sysctl = NULL; 4524 unregister_sysctl_table(t->sysctl_header); 4525 kfree(t->dev_name); 4526 kfree(t); 4527 } 4528 4529 static void addrconf_sysctl_register(struct inet6_dev *idev) 4530 { 4531 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4532 &ndisc_ifinfo_sysctl_change); 4533 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4534 idev, &idev->cnf); 4535 } 4536 4537 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4538 { 4539 __addrconf_sysctl_unregister(&idev->cnf); 4540 neigh_sysctl_unregister(idev->nd_parms); 4541 } 4542 4543 4544 #endif 4545 4546 static int __net_init addrconf_init_net(struct net *net) 4547 { 4548 int err; 4549 struct ipv6_devconf *all, *dflt; 4550 4551 err = -ENOMEM; 4552 all = &ipv6_devconf; 4553 dflt = &ipv6_devconf_dflt; 4554 4555 if (!net_eq(net, &init_net)) { 4556 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4557 if (all == NULL) 4558 goto err_alloc_all; 4559 4560 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4561 if (dflt == NULL) 4562 goto err_alloc_dflt; 4563 } else { 4564 /* these will be inherited by all namespaces */ 4565 dflt->autoconf = ipv6_defaults.autoconf; 4566 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4567 } 4568 4569 net->ipv6.devconf_all = all; 4570 net->ipv6.devconf_dflt = dflt; 4571 4572 #ifdef CONFIG_SYSCTL 4573 err = __addrconf_sysctl_register(net, "all", NULL, all); 4574 if (err < 0) 4575 goto err_reg_all; 4576 4577 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4578 if (err < 0) 4579 goto err_reg_dflt; 4580 #endif 4581 return 0; 4582 4583 #ifdef CONFIG_SYSCTL 4584 err_reg_dflt: 4585 __addrconf_sysctl_unregister(all); 4586 err_reg_all: 4587 kfree(dflt); 4588 #endif 4589 err_alloc_dflt: 4590 kfree(all); 4591 err_alloc_all: 4592 return err; 4593 } 4594 4595 static void __net_exit addrconf_exit_net(struct net *net) 4596 { 4597 #ifdef CONFIG_SYSCTL 4598 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4599 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4600 #endif 4601 if (!net_eq(net, &init_net)) { 4602 kfree(net->ipv6.devconf_dflt); 4603 kfree(net->ipv6.devconf_all); 4604 } 4605 } 4606 4607 static struct pernet_operations addrconf_ops = { 4608 .init = addrconf_init_net, 4609 .exit = addrconf_exit_net, 4610 }; 4611 4612 /* 4613 * Device notifier 4614 */ 4615 4616 int register_inet6addr_notifier(struct notifier_block *nb) 4617 { 4618 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4619 } 4620 EXPORT_SYMBOL(register_inet6addr_notifier); 4621 4622 int unregister_inet6addr_notifier(struct notifier_block *nb) 4623 { 4624 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4625 } 4626 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4627 4628 /* 4629 * Init / cleanup code 4630 */ 4631 4632 int __init addrconf_init(void) 4633 { 4634 int i, err; 4635 4636 err = ipv6_addr_label_init(); 4637 if (err < 0) { 4638 printk(KERN_CRIT "IPv6 Addrconf:" 4639 " cannot initialize default policy table: %d.\n", err); 4640 return err; 4641 } 4642 4643 register_pernet_subsys(&addrconf_ops); 4644 4645 /* The addrconf netdev notifier requires that loopback_dev 4646 * has it's ipv6 private information allocated and setup 4647 * before it can bring up and give link-local addresses 4648 * to other devices which are up. 4649 * 4650 * Unfortunately, loopback_dev is not necessarily the first 4651 * entry in the global dev_base list of net devices. In fact, 4652 * it is likely to be the very last entry on that list. 4653 * So this causes the notifier registry below to try and 4654 * give link-local addresses to all devices besides loopback_dev 4655 * first, then loopback_dev, which cases all the non-loopback_dev 4656 * devices to fail to get a link-local address. 4657 * 4658 * So, as a temporary fix, allocate the ipv6 structure for 4659 * loopback_dev first by hand. 4660 * Longer term, all of the dependencies ipv6 has upon the loopback 4661 * device and it being up should be removed. 4662 */ 4663 rtnl_lock(); 4664 if (!ipv6_add_dev(init_net.loopback_dev)) 4665 err = -ENOMEM; 4666 rtnl_unlock(); 4667 if (err) 4668 goto errlo; 4669 4670 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4671 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4672 4673 register_netdevice_notifier(&ipv6_dev_notf); 4674 4675 addrconf_verify(0); 4676 4677 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4678 if (err < 0) 4679 goto errout; 4680 4681 /* Only the first call to __rtnl_register can fail */ 4682 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4683 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4684 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4685 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4686 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4687 4688 ipv6_addr_label_rtnl_register(); 4689 4690 return 0; 4691 errout: 4692 unregister_netdevice_notifier(&ipv6_dev_notf); 4693 errlo: 4694 unregister_pernet_subsys(&addrconf_ops); 4695 4696 return err; 4697 } 4698 4699 void addrconf_cleanup(void) 4700 { 4701 struct net_device *dev; 4702 int i; 4703 4704 unregister_netdevice_notifier(&ipv6_dev_notf); 4705 unregister_pernet_subsys(&addrconf_ops); 4706 4707 rtnl_lock(); 4708 4709 /* clean dev list */ 4710 for_each_netdev(&init_net, dev) { 4711 if (__in6_dev_get(dev) == NULL) 4712 continue; 4713 addrconf_ifdown(dev, 1); 4714 } 4715 addrconf_ifdown(init_net.loopback_dev, 2); 4716 4717 /* 4718 * Check hash table. 4719 */ 4720 spin_lock_bh(&addrconf_hash_lock); 4721 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4722 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4723 spin_unlock_bh(&addrconf_hash_lock); 4724 4725 del_timer(&addr_chk_timer); 4726 rtnl_unlock(); 4727 } 4728