1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #include <linux/errno.h> 42 #include <linux/types.h> 43 #include <linux/kernel.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <linux/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 91 /* Set to 3 to get tracing... */ 92 #define ACONF_DEBUG 2 93 94 #if ACONF_DEBUG >= 3 95 #define ADBG(x) printk x 96 #else 97 #define ADBG(x) 98 #endif 99 100 #define INFINITY_LIFE_TIME 0xFFFFFFFF 101 102 static inline u32 cstamp_delta(unsigned long cstamp) 103 { 104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 105 } 106 107 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 108 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 109 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 110 111 #ifdef CONFIG_SYSCTL 112 static void addrconf_sysctl_register(struct inet6_dev *idev); 113 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 114 #else 115 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 116 { 117 } 118 119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 120 { 121 } 122 #endif 123 124 #ifdef CONFIG_IPV6_PRIVACY 125 static int __ipv6_regen_rndid(struct inet6_dev *idev); 126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 127 static void ipv6_regen_rndid(unsigned long data); 128 #endif 129 130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 131 static int ipv6_count_addresses(struct inet6_dev *idev); 132 133 /* 134 * Configured unicast address hash table 135 */ 136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 137 static DEFINE_SPINLOCK(addrconf_hash_lock); 138 139 static void addrconf_verify(unsigned long); 140 141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 142 static DEFINE_SPINLOCK(addrconf_verify_lock); 143 144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 146 147 static void addrconf_type_change(struct net_device *dev, 148 unsigned long event); 149 static int addrconf_ifdown(struct net_device *dev, int how); 150 151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 152 static void addrconf_dad_timer(unsigned long data); 153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 154 static void addrconf_dad_run(struct inet6_dev *idev); 155 static void addrconf_rs_timer(unsigned long data); 156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 158 159 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 160 struct prefix_info *pinfo); 161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 162 struct net_device *dev); 163 164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 165 166 static struct ipv6_devconf ipv6_devconf __read_mostly = { 167 .forwarding = 0, 168 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 169 .mtu6 = IPV6_MIN_MTU, 170 .accept_ra = 1, 171 .accept_redirects = 1, 172 .autoconf = 1, 173 .force_mld_version = 0, 174 .dad_transmits = 1, 175 .rtr_solicits = MAX_RTR_SOLICITATIONS, 176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 178 #ifdef CONFIG_IPV6_PRIVACY 179 .use_tempaddr = 0, 180 .temp_valid_lft = TEMP_VALID_LIFETIME, 181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 182 .regen_max_retry = REGEN_MAX_RETRY, 183 .max_desync_factor = MAX_DESYNC_FACTOR, 184 #endif 185 .max_addresses = IPV6_MAX_ADDRESSES, 186 .accept_ra_defrtr = 1, 187 .accept_ra_pinfo = 1, 188 #ifdef CONFIG_IPV6_ROUTER_PREF 189 .accept_ra_rtr_pref = 1, 190 .rtr_probe_interval = 60 * HZ, 191 #ifdef CONFIG_IPV6_ROUTE_INFO 192 .accept_ra_rt_info_max_plen = 0, 193 #endif 194 #endif 195 .proxy_ndp = 0, 196 .accept_source_route = 0, /* we do not accept RH0 by default. */ 197 .disable_ipv6 = 0, 198 .accept_dad = 1, 199 }; 200 201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 202 .forwarding = 0, 203 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 204 .mtu6 = IPV6_MIN_MTU, 205 .accept_ra = 1, 206 .accept_redirects = 1, 207 .autoconf = 1, 208 .dad_transmits = 1, 209 .rtr_solicits = MAX_RTR_SOLICITATIONS, 210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 212 #ifdef CONFIG_IPV6_PRIVACY 213 .use_tempaddr = 0, 214 .temp_valid_lft = TEMP_VALID_LIFETIME, 215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 216 .regen_max_retry = REGEN_MAX_RETRY, 217 .max_desync_factor = MAX_DESYNC_FACTOR, 218 #endif 219 .max_addresses = IPV6_MAX_ADDRESSES, 220 .accept_ra_defrtr = 1, 221 .accept_ra_pinfo = 1, 222 #ifdef CONFIG_IPV6_ROUTER_PREF 223 .accept_ra_rtr_pref = 1, 224 .rtr_probe_interval = 60 * HZ, 225 #ifdef CONFIG_IPV6_ROUTE_INFO 226 .accept_ra_rt_info_max_plen = 0, 227 #endif 228 #endif 229 .proxy_ndp = 0, 230 .accept_source_route = 0, /* we do not accept RH0 by default. */ 231 .disable_ipv6 = 0, 232 .accept_dad = 1, 233 }; 234 235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 240 241 /* Check if a valid qdisc is available */ 242 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 243 { 244 return !qdisc_tx_is_noop(dev); 245 } 246 247 /* Check if a route is valid prefix route */ 248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 249 { 250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 251 } 252 253 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 254 { 255 if (del_timer(&ifp->timer)) 256 __in6_ifa_put(ifp); 257 } 258 259 enum addrconf_timer_t { 260 AC_NONE, 261 AC_DAD, 262 AC_RS, 263 }; 264 265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 266 enum addrconf_timer_t what, 267 unsigned long when) 268 { 269 if (!del_timer(&ifp->timer)) 270 in6_ifa_hold(ifp); 271 272 switch (what) { 273 case AC_DAD: 274 ifp->timer.function = addrconf_dad_timer; 275 break; 276 case AC_RS: 277 ifp->timer.function = addrconf_rs_timer; 278 break; 279 default: 280 break; 281 } 282 ifp->timer.expires = jiffies + when; 283 add_timer(&ifp->timer); 284 } 285 286 static int snmp6_alloc_dev(struct inet6_dev *idev) 287 { 288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 289 sizeof(struct ipstats_mib), 290 __alignof__(struct ipstats_mib)) < 0) 291 goto err_ip; 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 293 GFP_KERNEL); 294 if (!idev->stats.icmpv6dev) 295 goto err_icmp; 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 297 GFP_KERNEL); 298 if (!idev->stats.icmpv6msgdev) 299 goto err_icmpmsg; 300 301 return 0; 302 303 err_icmpmsg: 304 kfree(idev->stats.icmpv6dev); 305 err_icmp: 306 snmp_mib_free((void __percpu **)idev->stats.ipv6); 307 err_ip: 308 return -ENOMEM; 309 } 310 311 static void snmp6_free_dev(struct inet6_dev *idev) 312 { 313 kfree(idev->stats.icmpv6msgdev); 314 kfree(idev->stats.icmpv6dev); 315 snmp_mib_free((void __percpu **)idev->stats.ipv6); 316 } 317 318 /* Nobody refers to this device, we may destroy it. */ 319 320 void in6_dev_finish_destroy(struct inet6_dev *idev) 321 { 322 struct net_device *dev = idev->dev; 323 324 WARN_ON(!list_empty(&idev->addr_list)); 325 WARN_ON(idev->mc_list != NULL); 326 327 #ifdef NET_REFCNT_DEBUG 328 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 329 #endif 330 dev_put(dev); 331 if (!idev->dead) { 332 pr_warning("Freeing alive inet6 device %p\n", idev); 333 return; 334 } 335 snmp6_free_dev(idev); 336 kfree_rcu(idev, rcu); 337 } 338 339 EXPORT_SYMBOL(in6_dev_finish_destroy); 340 341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 342 { 343 struct inet6_dev *ndev; 344 345 ASSERT_RTNL(); 346 347 if (dev->mtu < IPV6_MIN_MTU) 348 return NULL; 349 350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 351 352 if (ndev == NULL) 353 return NULL; 354 355 rwlock_init(&ndev->lock); 356 ndev->dev = dev; 357 INIT_LIST_HEAD(&ndev->addr_list); 358 359 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 360 ndev->cnf.mtu6 = dev->mtu; 361 ndev->cnf.sysctl = NULL; 362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 363 if (ndev->nd_parms == NULL) { 364 kfree(ndev); 365 return NULL; 366 } 367 if (ndev->cnf.forwarding) 368 dev_disable_lro(dev); 369 /* We refer to the device */ 370 dev_hold(dev); 371 372 if (snmp6_alloc_dev(ndev) < 0) { 373 ADBG((KERN_WARNING 374 "%s(): cannot allocate memory for statistics; dev=%s.\n", 375 __func__, dev->name)); 376 neigh_parms_release(&nd_tbl, ndev->nd_parms); 377 ndev->dead = 1; 378 in6_dev_finish_destroy(ndev); 379 return NULL; 380 } 381 382 if (snmp6_register_dev(ndev) < 0) { 383 ADBG((KERN_WARNING 384 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 385 __func__, dev->name)); 386 neigh_parms_release(&nd_tbl, ndev->nd_parms); 387 ndev->dead = 1; 388 in6_dev_finish_destroy(ndev); 389 return NULL; 390 } 391 392 /* One reference from device. We must do this before 393 * we invoke __ipv6_regen_rndid(). 394 */ 395 in6_dev_hold(ndev); 396 397 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 398 ndev->cnf.accept_dad = -1; 399 400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 402 printk(KERN_INFO 403 "%s: Disabled Multicast RS\n", 404 dev->name); 405 ndev->cnf.rtr_solicits = 0; 406 } 407 #endif 408 409 #ifdef CONFIG_IPV6_PRIVACY 410 INIT_LIST_HEAD(&ndev->tempaddr_list); 411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 412 if ((dev->flags&IFF_LOOPBACK) || 413 dev->type == ARPHRD_TUNNEL || 414 dev->type == ARPHRD_TUNNEL6 || 415 dev->type == ARPHRD_SIT || 416 dev->type == ARPHRD_NONE) { 417 ndev->cnf.use_tempaddr = -1; 418 } else { 419 in6_dev_hold(ndev); 420 ipv6_regen_rndid((unsigned long) ndev); 421 } 422 #endif 423 424 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 425 ndev->if_flags |= IF_READY; 426 427 ipv6_mc_init_dev(ndev); 428 ndev->tstamp = jiffies; 429 addrconf_sysctl_register(ndev); 430 /* protected by rtnl_lock */ 431 rcu_assign_pointer(dev->ip6_ptr, ndev); 432 433 /* Join all-node multicast group */ 434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 435 436 return ndev; 437 } 438 439 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 440 { 441 struct inet6_dev *idev; 442 443 ASSERT_RTNL(); 444 445 idev = __in6_dev_get(dev); 446 if (!idev) { 447 idev = ipv6_add_dev(dev); 448 if (!idev) 449 return NULL; 450 } 451 452 if (dev->flags&IFF_UP) 453 ipv6_mc_up(idev); 454 return idev; 455 } 456 457 #ifdef CONFIG_SYSCTL 458 static void dev_forward_change(struct inet6_dev *idev) 459 { 460 struct net_device *dev; 461 struct inet6_ifaddr *ifa; 462 463 if (!idev) 464 return; 465 dev = idev->dev; 466 if (idev->cnf.forwarding) 467 dev_disable_lro(dev); 468 if (dev && (dev->flags & IFF_MULTICAST)) { 469 if (idev->cnf.forwarding) 470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 471 else 472 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 473 } 474 475 list_for_each_entry(ifa, &idev->addr_list, if_list) { 476 if (ifa->flags&IFA_F_TENTATIVE) 477 continue; 478 if (idev->cnf.forwarding) 479 addrconf_join_anycast(ifa); 480 else 481 addrconf_leave_anycast(ifa); 482 } 483 } 484 485 486 static void addrconf_forward_change(struct net *net, __s32 newf) 487 { 488 struct net_device *dev; 489 struct inet6_dev *idev; 490 491 rcu_read_lock(); 492 for_each_netdev_rcu(net, dev) { 493 idev = __in6_dev_get(dev); 494 if (idev) { 495 int changed = (!idev->cnf.forwarding) ^ (!newf); 496 idev->cnf.forwarding = newf; 497 if (changed) 498 dev_forward_change(idev); 499 } 500 } 501 rcu_read_unlock(); 502 } 503 504 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 505 { 506 struct net *net; 507 508 net = (struct net *)table->extra2; 509 if (p == &net->ipv6.devconf_dflt->forwarding) 510 return 0; 511 512 if (!rtnl_trylock()) { 513 /* Restore the original values before restarting */ 514 *p = old; 515 return restart_syscall(); 516 } 517 518 if (p == &net->ipv6.devconf_all->forwarding) { 519 __s32 newf = net->ipv6.devconf_all->forwarding; 520 net->ipv6.devconf_dflt->forwarding = newf; 521 addrconf_forward_change(net, newf); 522 } else if ((!*p) ^ (!old)) 523 dev_forward_change((struct inet6_dev *)table->extra1); 524 rtnl_unlock(); 525 526 if (*p) 527 rt6_purge_dflt_routers(net); 528 return 1; 529 } 530 #endif 531 532 /* Nobody refers to this ifaddr, destroy it */ 533 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 534 { 535 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 536 537 #ifdef NET_REFCNT_DEBUG 538 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 539 #endif 540 541 in6_dev_put(ifp->idev); 542 543 if (del_timer(&ifp->timer)) 544 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 545 546 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 547 pr_warning("Freeing alive inet6 address %p\n", ifp); 548 return; 549 } 550 dst_release(&ifp->rt->dst); 551 552 kfree_rcu(ifp, rcu); 553 } 554 555 static void 556 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 557 { 558 struct list_head *p; 559 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 560 561 /* 562 * Each device address list is sorted in order of scope - 563 * global before linklocal. 564 */ 565 list_for_each(p, &idev->addr_list) { 566 struct inet6_ifaddr *ifa 567 = list_entry(p, struct inet6_ifaddr, if_list); 568 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 569 break; 570 } 571 572 list_add_tail(&ifp->if_list, p); 573 } 574 575 static u32 ipv6_addr_hash(const struct in6_addr *addr) 576 { 577 /* 578 * We perform the hash function over the last 64 bits of the address 579 * This will include the IEEE address token on links that support it. 580 */ 581 return jhash_2words((__force u32)addr->s6_addr32[2], 582 (__force u32)addr->s6_addr32[3], 0) 583 & (IN6_ADDR_HSIZE - 1); 584 } 585 586 /* On success it returns ifp with increased reference count */ 587 588 static struct inet6_ifaddr * 589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 590 int scope, u32 flags) 591 { 592 struct inet6_ifaddr *ifa = NULL; 593 struct rt6_info *rt; 594 unsigned int hash; 595 int err = 0; 596 int addr_type = ipv6_addr_type(addr); 597 598 if (addr_type == IPV6_ADDR_ANY || 599 addr_type & IPV6_ADDR_MULTICAST || 600 (!(idev->dev->flags & IFF_LOOPBACK) && 601 addr_type & IPV6_ADDR_LOOPBACK)) 602 return ERR_PTR(-EADDRNOTAVAIL); 603 604 rcu_read_lock_bh(); 605 if (idev->dead) { 606 err = -ENODEV; /*XXX*/ 607 goto out2; 608 } 609 610 if (idev->cnf.disable_ipv6) { 611 err = -EACCES; 612 goto out2; 613 } 614 615 spin_lock(&addrconf_hash_lock); 616 617 /* Ignore adding duplicate addresses on an interface */ 618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 619 ADBG(("ipv6_add_addr: already assigned\n")); 620 err = -EEXIST; 621 goto out; 622 } 623 624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 625 626 if (ifa == NULL) { 627 ADBG(("ipv6_add_addr: malloc failed\n")); 628 err = -ENOBUFS; 629 goto out; 630 } 631 632 rt = addrconf_dst_alloc(idev, addr, 0); 633 if (IS_ERR(rt)) { 634 err = PTR_ERR(rt); 635 goto out; 636 } 637 638 ipv6_addr_copy(&ifa->addr, addr); 639 640 spin_lock_init(&ifa->lock); 641 spin_lock_init(&ifa->state_lock); 642 init_timer(&ifa->timer); 643 INIT_HLIST_NODE(&ifa->addr_lst); 644 ifa->timer.data = (unsigned long) ifa; 645 ifa->scope = scope; 646 ifa->prefix_len = pfxlen; 647 ifa->flags = flags | IFA_F_TENTATIVE; 648 ifa->cstamp = ifa->tstamp = jiffies; 649 650 ifa->rt = rt; 651 652 /* 653 * part one of RFC 4429, section 3.3 654 * We should not configure an address as 655 * optimistic if we do not yet know the link 656 * layer address of our nexhop router 657 */ 658 659 if (rt->rt6i_nexthop == NULL) 660 ifa->flags &= ~IFA_F_OPTIMISTIC; 661 662 ifa->idev = idev; 663 in6_dev_hold(idev); 664 /* For caller */ 665 in6_ifa_hold(ifa); 666 667 /* Add to big hash table */ 668 hash = ipv6_addr_hash(addr); 669 670 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 671 spin_unlock(&addrconf_hash_lock); 672 673 write_lock(&idev->lock); 674 /* Add to inet6_dev unicast addr list. */ 675 ipv6_link_dev_addr(idev, ifa); 676 677 #ifdef CONFIG_IPV6_PRIVACY 678 if (ifa->flags&IFA_F_TEMPORARY) { 679 list_add(&ifa->tmp_list, &idev->tempaddr_list); 680 in6_ifa_hold(ifa); 681 } 682 #endif 683 684 in6_ifa_hold(ifa); 685 write_unlock(&idev->lock); 686 out2: 687 rcu_read_unlock_bh(); 688 689 if (likely(err == 0)) 690 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 691 else { 692 kfree(ifa); 693 ifa = ERR_PTR(err); 694 } 695 696 return ifa; 697 out: 698 spin_unlock(&addrconf_hash_lock); 699 goto out2; 700 } 701 702 /* This function wants to get referenced ifp and releases it before return */ 703 704 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 705 { 706 struct inet6_ifaddr *ifa, *ifn; 707 struct inet6_dev *idev = ifp->idev; 708 int state; 709 int deleted = 0, onlink = 0; 710 unsigned long expires = jiffies; 711 712 spin_lock_bh(&ifp->state_lock); 713 state = ifp->state; 714 ifp->state = INET6_IFADDR_STATE_DEAD; 715 spin_unlock_bh(&ifp->state_lock); 716 717 if (state == INET6_IFADDR_STATE_DEAD) 718 goto out; 719 720 spin_lock_bh(&addrconf_hash_lock); 721 hlist_del_init_rcu(&ifp->addr_lst); 722 spin_unlock_bh(&addrconf_hash_lock); 723 724 write_lock_bh(&idev->lock); 725 #ifdef CONFIG_IPV6_PRIVACY 726 if (ifp->flags&IFA_F_TEMPORARY) { 727 list_del(&ifp->tmp_list); 728 if (ifp->ifpub) { 729 in6_ifa_put(ifp->ifpub); 730 ifp->ifpub = NULL; 731 } 732 __in6_ifa_put(ifp); 733 } 734 #endif 735 736 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 737 if (ifa == ifp) { 738 list_del_init(&ifp->if_list); 739 __in6_ifa_put(ifp); 740 741 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 742 break; 743 deleted = 1; 744 continue; 745 } else if (ifp->flags & IFA_F_PERMANENT) { 746 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 747 ifp->prefix_len)) { 748 if (ifa->flags & IFA_F_PERMANENT) { 749 onlink = 1; 750 if (deleted) 751 break; 752 } else { 753 unsigned long lifetime; 754 755 if (!onlink) 756 onlink = -1; 757 758 spin_lock(&ifa->lock); 759 760 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 761 /* 762 * Note: Because this address is 763 * not permanent, lifetime < 764 * LONG_MAX / HZ here. 765 */ 766 if (time_before(expires, 767 ifa->tstamp + lifetime * HZ)) 768 expires = ifa->tstamp + lifetime * HZ; 769 spin_unlock(&ifa->lock); 770 } 771 } 772 } 773 } 774 write_unlock_bh(&idev->lock); 775 776 addrconf_del_timer(ifp); 777 778 ipv6_ifa_notify(RTM_DELADDR, ifp); 779 780 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 781 782 /* 783 * Purge or update corresponding prefix 784 * 785 * 1) we don't purge prefix here if address was not permanent. 786 * prefix is managed by its own lifetime. 787 * 2) if there're no addresses, delete prefix. 788 * 3) if there're still other permanent address(es), 789 * corresponding prefix is still permanent. 790 * 4) otherwise, update prefix lifetime to the 791 * longest valid lifetime among the corresponding 792 * addresses on the device. 793 * Note: subsequent RA will update lifetime. 794 * 795 * --yoshfuji 796 */ 797 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 798 struct in6_addr prefix; 799 struct rt6_info *rt; 800 struct net *net = dev_net(ifp->idev->dev); 801 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 802 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 803 804 if (rt && addrconf_is_prefix_route(rt)) { 805 if (onlink == 0) { 806 ip6_del_rt(rt); 807 rt = NULL; 808 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 809 rt->rt6i_expires = expires; 810 rt->rt6i_flags |= RTF_EXPIRES; 811 } 812 } 813 dst_release(&rt->dst); 814 } 815 816 /* clean up prefsrc entries */ 817 rt6_remove_prefsrc(ifp); 818 out: 819 in6_ifa_put(ifp); 820 } 821 822 #ifdef CONFIG_IPV6_PRIVACY 823 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 824 { 825 struct inet6_dev *idev = ifp->idev; 826 struct in6_addr addr, *tmpaddr; 827 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age; 828 unsigned long regen_advance; 829 int tmp_plen; 830 int ret = 0; 831 int max_addresses; 832 u32 addr_flags; 833 834 write_lock(&idev->lock); 835 if (ift) { 836 spin_lock_bh(&ift->lock); 837 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 838 spin_unlock_bh(&ift->lock); 839 tmpaddr = &addr; 840 } else { 841 tmpaddr = NULL; 842 } 843 retry: 844 in6_dev_hold(idev); 845 if (idev->cnf.use_tempaddr <= 0) { 846 write_unlock(&idev->lock); 847 printk(KERN_INFO 848 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 849 in6_dev_put(idev); 850 ret = -1; 851 goto out; 852 } 853 spin_lock_bh(&ifp->lock); 854 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 855 idev->cnf.use_tempaddr = -1; /*XXX*/ 856 spin_unlock_bh(&ifp->lock); 857 write_unlock(&idev->lock); 858 printk(KERN_WARNING 859 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 860 in6_dev_put(idev); 861 ret = -1; 862 goto out; 863 } 864 in6_ifa_hold(ifp); 865 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 866 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 867 spin_unlock_bh(&ifp->lock); 868 write_unlock(&idev->lock); 869 printk(KERN_WARNING 870 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 871 in6_ifa_put(ifp); 872 in6_dev_put(idev); 873 ret = -1; 874 goto out; 875 } 876 memcpy(&addr.s6_addr[8], idev->rndid, 8); 877 age = (jiffies - ifp->tstamp) / HZ; 878 tmp_valid_lft = min_t(__u32, 879 ifp->valid_lft, 880 idev->cnf.temp_valid_lft + age); 881 tmp_prefered_lft = min_t(__u32, 882 ifp->prefered_lft, 883 idev->cnf.temp_prefered_lft + age - 884 idev->cnf.max_desync_factor); 885 tmp_plen = ifp->prefix_len; 886 max_addresses = idev->cnf.max_addresses; 887 tmp_cstamp = ifp->cstamp; 888 tmp_tstamp = ifp->tstamp; 889 spin_unlock_bh(&ifp->lock); 890 891 regen_advance = idev->cnf.regen_max_retry * 892 idev->cnf.dad_transmits * 893 idev->nd_parms->retrans_time / HZ; 894 write_unlock(&idev->lock); 895 896 /* A temporary address is created only if this calculated Preferred 897 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 898 * an implementation must not create a temporary address with a zero 899 * Preferred Lifetime. 900 */ 901 if (tmp_prefered_lft <= regen_advance) { 902 in6_ifa_put(ifp); 903 in6_dev_put(idev); 904 ret = -1; 905 goto out; 906 } 907 908 addr_flags = IFA_F_TEMPORARY; 909 /* set in addrconf_prefix_rcv() */ 910 if (ifp->flags & IFA_F_OPTIMISTIC) 911 addr_flags |= IFA_F_OPTIMISTIC; 912 913 ift = !max_addresses || 914 ipv6_count_addresses(idev) < max_addresses ? 915 ipv6_add_addr(idev, &addr, tmp_plen, 916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 917 addr_flags) : NULL; 918 if (!ift || IS_ERR(ift)) { 919 in6_ifa_put(ifp); 920 in6_dev_put(idev); 921 printk(KERN_INFO 922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 923 tmpaddr = &addr; 924 write_lock(&idev->lock); 925 goto retry; 926 } 927 928 spin_lock_bh(&ift->lock); 929 ift->ifpub = ifp; 930 ift->valid_lft = tmp_valid_lft; 931 ift->prefered_lft = tmp_prefered_lft; 932 ift->cstamp = tmp_cstamp; 933 ift->tstamp = tmp_tstamp; 934 spin_unlock_bh(&ift->lock); 935 936 addrconf_dad_start(ift, 0); 937 in6_ifa_put(ift); 938 in6_dev_put(idev); 939 out: 940 return ret; 941 } 942 #endif 943 944 /* 945 * Choose an appropriate source address (RFC3484) 946 */ 947 enum { 948 IPV6_SADDR_RULE_INIT = 0, 949 IPV6_SADDR_RULE_LOCAL, 950 IPV6_SADDR_RULE_SCOPE, 951 IPV6_SADDR_RULE_PREFERRED, 952 #ifdef CONFIG_IPV6_MIP6 953 IPV6_SADDR_RULE_HOA, 954 #endif 955 IPV6_SADDR_RULE_OIF, 956 IPV6_SADDR_RULE_LABEL, 957 #ifdef CONFIG_IPV6_PRIVACY 958 IPV6_SADDR_RULE_PRIVACY, 959 #endif 960 IPV6_SADDR_RULE_ORCHID, 961 IPV6_SADDR_RULE_PREFIX, 962 IPV6_SADDR_RULE_MAX 963 }; 964 965 struct ipv6_saddr_score { 966 int rule; 967 int addr_type; 968 struct inet6_ifaddr *ifa; 969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 970 int scopedist; 971 int matchlen; 972 }; 973 974 struct ipv6_saddr_dst { 975 const struct in6_addr *addr; 976 int ifindex; 977 int scope; 978 int label; 979 unsigned int prefs; 980 }; 981 982 static inline int ipv6_saddr_preferred(int type) 983 { 984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 985 return 1; 986 return 0; 987 } 988 989 static int ipv6_get_saddr_eval(struct net *net, 990 struct ipv6_saddr_score *score, 991 struct ipv6_saddr_dst *dst, 992 int i) 993 { 994 int ret; 995 996 if (i <= score->rule) { 997 switch (i) { 998 case IPV6_SADDR_RULE_SCOPE: 999 ret = score->scopedist; 1000 break; 1001 case IPV6_SADDR_RULE_PREFIX: 1002 ret = score->matchlen; 1003 break; 1004 default: 1005 ret = !!test_bit(i, score->scorebits); 1006 } 1007 goto out; 1008 } 1009 1010 switch (i) { 1011 case IPV6_SADDR_RULE_INIT: 1012 /* Rule 0: remember if hiscore is not ready yet */ 1013 ret = !!score->ifa; 1014 break; 1015 case IPV6_SADDR_RULE_LOCAL: 1016 /* Rule 1: Prefer same address */ 1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1018 break; 1019 case IPV6_SADDR_RULE_SCOPE: 1020 /* Rule 2: Prefer appropriate scope 1021 * 1022 * ret 1023 * ^ 1024 * -1 | d 15 1025 * ---+--+-+---> scope 1026 * | 1027 * | d is scope of the destination. 1028 * B-d | \ 1029 * | \ <- smaller scope is better if 1030 * B-15 | \ if scope is enough for destinaion. 1031 * | ret = B - scope (-1 <= scope >= d <= 15). 1032 * d-C-1 | / 1033 * |/ <- greater is better 1034 * -C / if scope is not enough for destination. 1035 * /| ret = scope - C (-1 <= d < scope <= 15). 1036 * 1037 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1039 * Assume B = 0 and we get C > 29. 1040 */ 1041 ret = __ipv6_addr_src_scope(score->addr_type); 1042 if (ret >= dst->scope) 1043 ret = -ret; 1044 else 1045 ret -= 128; /* 30 is enough */ 1046 score->scopedist = ret; 1047 break; 1048 case IPV6_SADDR_RULE_PREFERRED: 1049 /* Rule 3: Avoid deprecated and optimistic addresses */ 1050 ret = ipv6_saddr_preferred(score->addr_type) || 1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1052 break; 1053 #ifdef CONFIG_IPV6_MIP6 1054 case IPV6_SADDR_RULE_HOA: 1055 { 1056 /* Rule 4: Prefer home address */ 1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1059 break; 1060 } 1061 #endif 1062 case IPV6_SADDR_RULE_OIF: 1063 /* Rule 5: Prefer outgoing interface */ 1064 ret = (!dst->ifindex || 1065 dst->ifindex == score->ifa->idev->dev->ifindex); 1066 break; 1067 case IPV6_SADDR_RULE_LABEL: 1068 /* Rule 6: Prefer matching label */ 1069 ret = ipv6_addr_label(net, 1070 &score->ifa->addr, score->addr_type, 1071 score->ifa->idev->dev->ifindex) == dst->label; 1072 break; 1073 #ifdef CONFIG_IPV6_PRIVACY 1074 case IPV6_SADDR_RULE_PRIVACY: 1075 { 1076 /* Rule 7: Prefer public address 1077 * Note: prefer temporary address if use_tempaddr >= 2 1078 */ 1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1081 score->ifa->idev->cnf.use_tempaddr >= 2; 1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1083 break; 1084 } 1085 #endif 1086 case IPV6_SADDR_RULE_ORCHID: 1087 /* Rule 8-: Prefer ORCHID vs ORCHID or 1088 * non-ORCHID vs non-ORCHID 1089 */ 1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1091 ipv6_addr_orchid(dst->addr)); 1092 break; 1093 case IPV6_SADDR_RULE_PREFIX: 1094 /* Rule 8: Use longest matching prefix */ 1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1096 dst->addr); 1097 break; 1098 default: 1099 ret = 0; 1100 } 1101 1102 if (ret) 1103 __set_bit(i, score->scorebits); 1104 score->rule = i; 1105 out: 1106 return ret; 1107 } 1108 1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1110 const struct in6_addr *daddr, unsigned int prefs, 1111 struct in6_addr *saddr) 1112 { 1113 struct ipv6_saddr_score scores[2], 1114 *score = &scores[0], *hiscore = &scores[1]; 1115 struct ipv6_saddr_dst dst; 1116 struct net_device *dev; 1117 int dst_type; 1118 1119 dst_type = __ipv6_addr_type(daddr); 1120 dst.addr = daddr; 1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1122 dst.scope = __ipv6_addr_src_scope(dst_type); 1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1124 dst.prefs = prefs; 1125 1126 hiscore->rule = -1; 1127 hiscore->ifa = NULL; 1128 1129 rcu_read_lock(); 1130 1131 for_each_netdev_rcu(net, dev) { 1132 struct inet6_dev *idev; 1133 1134 /* Candidate Source Address (section 4) 1135 * - multicast and link-local destination address, 1136 * the set of candidate source address MUST only 1137 * include addresses assigned to interfaces 1138 * belonging to the same link as the outgoing 1139 * interface. 1140 * (- For site-local destination addresses, the 1141 * set of candidate source addresses MUST only 1142 * include addresses assigned to interfaces 1143 * belonging to the same site as the outgoing 1144 * interface.) 1145 */ 1146 if (((dst_type & IPV6_ADDR_MULTICAST) || 1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1148 dst.ifindex && dev->ifindex != dst.ifindex) 1149 continue; 1150 1151 idev = __in6_dev_get(dev); 1152 if (!idev) 1153 continue; 1154 1155 read_lock_bh(&idev->lock); 1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1157 int i; 1158 1159 /* 1160 * - Tentative Address (RFC2462 section 5.4) 1161 * - A tentative address is not considered 1162 * "assigned to an interface" in the traditional 1163 * sense, unless it is also flagged as optimistic. 1164 * - Candidate Source Address (section 4) 1165 * - In any case, anycast addresses, multicast 1166 * addresses, and the unspecified address MUST 1167 * NOT be included in a candidate set. 1168 */ 1169 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1171 continue; 1172 1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1174 1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1176 score->addr_type & IPV6_ADDR_MULTICAST)) { 1177 LIMIT_NETDEBUG(KERN_DEBUG 1178 "ADDRCONF: unspecified / multicast address " 1179 "assigned as unicast address on %s", 1180 dev->name); 1181 continue; 1182 } 1183 1184 score->rule = -1; 1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1186 1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1188 int minihiscore, miniscore; 1189 1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1192 1193 if (minihiscore > miniscore) { 1194 if (i == IPV6_SADDR_RULE_SCOPE && 1195 score->scopedist > 0) { 1196 /* 1197 * special case: 1198 * each remaining entry 1199 * has too small (not enough) 1200 * scope, because ifa entries 1201 * are sorted by their scope 1202 * values. 1203 */ 1204 goto try_nextdev; 1205 } 1206 break; 1207 } else if (minihiscore < miniscore) { 1208 if (hiscore->ifa) 1209 in6_ifa_put(hiscore->ifa); 1210 1211 in6_ifa_hold(score->ifa); 1212 1213 swap(hiscore, score); 1214 1215 /* restore our iterator */ 1216 score->ifa = hiscore->ifa; 1217 1218 break; 1219 } 1220 } 1221 } 1222 try_nextdev: 1223 read_unlock_bh(&idev->lock); 1224 } 1225 rcu_read_unlock(); 1226 1227 if (!hiscore->ifa) 1228 return -EADDRNOTAVAIL; 1229 1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1231 in6_ifa_put(hiscore->ifa); 1232 return 0; 1233 } 1234 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1235 1236 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1237 unsigned char banned_flags) 1238 { 1239 struct inet6_dev *idev; 1240 int err = -EADDRNOTAVAIL; 1241 1242 rcu_read_lock(); 1243 idev = __in6_dev_get(dev); 1244 if (idev) { 1245 struct inet6_ifaddr *ifp; 1246 1247 read_lock_bh(&idev->lock); 1248 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1249 if (ifp->scope == IFA_LINK && 1250 !(ifp->flags & banned_flags)) { 1251 ipv6_addr_copy(addr, &ifp->addr); 1252 err = 0; 1253 break; 1254 } 1255 } 1256 read_unlock_bh(&idev->lock); 1257 } 1258 rcu_read_unlock(); 1259 return err; 1260 } 1261 1262 static int ipv6_count_addresses(struct inet6_dev *idev) 1263 { 1264 int cnt = 0; 1265 struct inet6_ifaddr *ifp; 1266 1267 read_lock_bh(&idev->lock); 1268 list_for_each_entry(ifp, &idev->addr_list, if_list) 1269 cnt++; 1270 read_unlock_bh(&idev->lock); 1271 return cnt; 1272 } 1273 1274 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1275 struct net_device *dev, int strict) 1276 { 1277 struct inet6_ifaddr *ifp; 1278 struct hlist_node *node; 1279 unsigned int hash = ipv6_addr_hash(addr); 1280 1281 rcu_read_lock_bh(); 1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1283 if (!net_eq(dev_net(ifp->idev->dev), net)) 1284 continue; 1285 if (ipv6_addr_equal(&ifp->addr, addr) && 1286 !(ifp->flags&IFA_F_TENTATIVE) && 1287 (dev == NULL || ifp->idev->dev == dev || 1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1289 rcu_read_unlock_bh(); 1290 return 1; 1291 } 1292 } 1293 1294 rcu_read_unlock_bh(); 1295 return 0; 1296 } 1297 EXPORT_SYMBOL(ipv6_chk_addr); 1298 1299 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1300 struct net_device *dev) 1301 { 1302 unsigned int hash = ipv6_addr_hash(addr); 1303 struct inet6_ifaddr *ifp; 1304 struct hlist_node *node; 1305 1306 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1307 if (!net_eq(dev_net(ifp->idev->dev), net)) 1308 continue; 1309 if (ipv6_addr_equal(&ifp->addr, addr)) { 1310 if (dev == NULL || ifp->idev->dev == dev) 1311 return true; 1312 } 1313 } 1314 return false; 1315 } 1316 1317 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1318 { 1319 struct inet6_dev *idev; 1320 struct inet6_ifaddr *ifa; 1321 int onlink; 1322 1323 onlink = 0; 1324 rcu_read_lock(); 1325 idev = __in6_dev_get(dev); 1326 if (idev) { 1327 read_lock_bh(&idev->lock); 1328 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1329 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1330 ifa->prefix_len); 1331 if (onlink) 1332 break; 1333 } 1334 read_unlock_bh(&idev->lock); 1335 } 1336 rcu_read_unlock(); 1337 return onlink; 1338 } 1339 1340 EXPORT_SYMBOL(ipv6_chk_prefix); 1341 1342 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1343 struct net_device *dev, int strict) 1344 { 1345 struct inet6_ifaddr *ifp, *result = NULL; 1346 unsigned int hash = ipv6_addr_hash(addr); 1347 struct hlist_node *node; 1348 1349 rcu_read_lock_bh(); 1350 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1351 if (!net_eq(dev_net(ifp->idev->dev), net)) 1352 continue; 1353 if (ipv6_addr_equal(&ifp->addr, addr)) { 1354 if (dev == NULL || ifp->idev->dev == dev || 1355 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1356 result = ifp; 1357 in6_ifa_hold(ifp); 1358 break; 1359 } 1360 } 1361 } 1362 rcu_read_unlock_bh(); 1363 1364 return result; 1365 } 1366 1367 /* Gets referenced address, destroys ifaddr */ 1368 1369 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1370 { 1371 if (ifp->flags&IFA_F_PERMANENT) { 1372 spin_lock_bh(&ifp->lock); 1373 addrconf_del_timer(ifp); 1374 ifp->flags |= IFA_F_TENTATIVE; 1375 if (dad_failed) 1376 ifp->flags |= IFA_F_DADFAILED; 1377 spin_unlock_bh(&ifp->lock); 1378 if (dad_failed) 1379 ipv6_ifa_notify(0, ifp); 1380 in6_ifa_put(ifp); 1381 #ifdef CONFIG_IPV6_PRIVACY 1382 } else if (ifp->flags&IFA_F_TEMPORARY) { 1383 struct inet6_ifaddr *ifpub; 1384 spin_lock_bh(&ifp->lock); 1385 ifpub = ifp->ifpub; 1386 if (ifpub) { 1387 in6_ifa_hold(ifpub); 1388 spin_unlock_bh(&ifp->lock); 1389 ipv6_create_tempaddr(ifpub, ifp); 1390 in6_ifa_put(ifpub); 1391 } else { 1392 spin_unlock_bh(&ifp->lock); 1393 } 1394 ipv6_del_addr(ifp); 1395 #endif 1396 } else 1397 ipv6_del_addr(ifp); 1398 } 1399 1400 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1401 { 1402 int err = -ENOENT; 1403 1404 spin_lock(&ifp->state_lock); 1405 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1406 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1407 err = 0; 1408 } 1409 spin_unlock(&ifp->state_lock); 1410 1411 return err; 1412 } 1413 1414 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1415 { 1416 struct inet6_dev *idev = ifp->idev; 1417 1418 if (addrconf_dad_end(ifp)) { 1419 in6_ifa_put(ifp); 1420 return; 1421 } 1422 1423 if (net_ratelimit()) 1424 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1425 ifp->idev->dev->name, &ifp->addr); 1426 1427 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1428 struct in6_addr addr; 1429 1430 addr.s6_addr32[0] = htonl(0xfe800000); 1431 addr.s6_addr32[1] = 0; 1432 1433 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1434 ipv6_addr_equal(&ifp->addr, &addr)) { 1435 /* DAD failed for link-local based on MAC address */ 1436 idev->cnf.disable_ipv6 = 1; 1437 1438 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1439 ifp->idev->dev->name); 1440 } 1441 } 1442 1443 addrconf_dad_stop(ifp, 1); 1444 } 1445 1446 /* Join to solicited addr multicast group. */ 1447 1448 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1449 { 1450 struct in6_addr maddr; 1451 1452 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1453 return; 1454 1455 addrconf_addr_solict_mult(addr, &maddr); 1456 ipv6_dev_mc_inc(dev, &maddr); 1457 } 1458 1459 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1460 { 1461 struct in6_addr maddr; 1462 1463 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1464 return; 1465 1466 addrconf_addr_solict_mult(addr, &maddr); 1467 __ipv6_dev_mc_dec(idev, &maddr); 1468 } 1469 1470 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1471 { 1472 struct in6_addr addr; 1473 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1474 if (ipv6_addr_any(&addr)) 1475 return; 1476 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1477 } 1478 1479 static void addrconf_leave_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_dec(ifp->idev, &addr); 1486 } 1487 1488 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1489 { 1490 if (dev->addr_len != ETH_ALEN) 1491 return -1; 1492 memcpy(eui, dev->dev_addr, 3); 1493 memcpy(eui + 5, dev->dev_addr + 3, 3); 1494 1495 /* 1496 * The zSeries OSA network cards can be shared among various 1497 * OS instances, but the OSA cards have only one MAC address. 1498 * This leads to duplicate address conflicts in conjunction 1499 * with IPv6 if more than one instance uses the same card. 1500 * 1501 * The driver for these cards can deliver a unique 16-bit 1502 * identifier for each instance sharing the same card. It is 1503 * placed instead of 0xFFFE in the interface identifier. The 1504 * "u" bit of the interface identifier is not inverted in this 1505 * case. Hence the resulting interface identifier has local 1506 * scope according to RFC2373. 1507 */ 1508 if (dev->dev_id) { 1509 eui[3] = (dev->dev_id >> 8) & 0xFF; 1510 eui[4] = dev->dev_id & 0xFF; 1511 } else { 1512 eui[3] = 0xFF; 1513 eui[4] = 0xFE; 1514 eui[0] ^= 2; 1515 } 1516 return 0; 1517 } 1518 1519 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1520 { 1521 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1522 if (dev->addr_len != ARCNET_ALEN) 1523 return -1; 1524 memset(eui, 0, 7); 1525 eui[7] = *(u8*)dev->dev_addr; 1526 return 0; 1527 } 1528 1529 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1530 { 1531 if (dev->addr_len != INFINIBAND_ALEN) 1532 return -1; 1533 memcpy(eui, dev->dev_addr + 12, 8); 1534 eui[0] |= 2; 1535 return 0; 1536 } 1537 1538 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1539 { 1540 if (addr == 0) 1541 return -1; 1542 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1543 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1544 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1545 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1546 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1547 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1548 eui[1] = 0; 1549 eui[2] = 0x5E; 1550 eui[3] = 0xFE; 1551 memcpy(eui + 4, &addr, 4); 1552 return 0; 1553 } 1554 1555 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1556 { 1557 if (dev->priv_flags & IFF_ISATAP) 1558 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1559 return -1; 1560 } 1561 1562 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1563 { 1564 switch (dev->type) { 1565 case ARPHRD_ETHER: 1566 case ARPHRD_FDDI: 1567 case ARPHRD_IEEE802_TR: 1568 return addrconf_ifid_eui48(eui, dev); 1569 case ARPHRD_ARCNET: 1570 return addrconf_ifid_arcnet(eui, dev); 1571 case ARPHRD_INFINIBAND: 1572 return addrconf_ifid_infiniband(eui, dev); 1573 case ARPHRD_SIT: 1574 return addrconf_ifid_sit(eui, dev); 1575 } 1576 return -1; 1577 } 1578 1579 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1580 { 1581 int err = -1; 1582 struct inet6_ifaddr *ifp; 1583 1584 read_lock_bh(&idev->lock); 1585 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1586 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1587 memcpy(eui, ifp->addr.s6_addr+8, 8); 1588 err = 0; 1589 break; 1590 } 1591 } 1592 read_unlock_bh(&idev->lock); 1593 return err; 1594 } 1595 1596 #ifdef CONFIG_IPV6_PRIVACY 1597 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1598 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1599 { 1600 regen: 1601 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1602 idev->rndid[0] &= ~0x02; 1603 1604 /* 1605 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1606 * check if generated address is not inappropriate 1607 * 1608 * - Reserved subnet anycast (RFC 2526) 1609 * 11111101 11....11 1xxxxxxx 1610 * - ISATAP (RFC4214) 6.1 1611 * 00-00-5E-FE-xx-xx-xx-xx 1612 * - value 0 1613 * - XXX: already assigned to an address on the device 1614 */ 1615 if (idev->rndid[0] == 0xfd && 1616 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1617 (idev->rndid[7]&0x80)) 1618 goto regen; 1619 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1620 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1621 goto regen; 1622 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1623 goto regen; 1624 } 1625 1626 return 0; 1627 } 1628 1629 static void ipv6_regen_rndid(unsigned long data) 1630 { 1631 struct inet6_dev *idev = (struct inet6_dev *) data; 1632 unsigned long expires; 1633 1634 rcu_read_lock_bh(); 1635 write_lock_bh(&idev->lock); 1636 1637 if (idev->dead) 1638 goto out; 1639 1640 if (__ipv6_regen_rndid(idev) < 0) 1641 goto out; 1642 1643 expires = jiffies + 1644 idev->cnf.temp_prefered_lft * HZ - 1645 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1646 idev->cnf.max_desync_factor * HZ; 1647 if (time_before(expires, jiffies)) { 1648 printk(KERN_WARNING 1649 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1650 idev->dev->name); 1651 goto out; 1652 } 1653 1654 if (!mod_timer(&idev->regen_timer, expires)) 1655 in6_dev_hold(idev); 1656 1657 out: 1658 write_unlock_bh(&idev->lock); 1659 rcu_read_unlock_bh(); 1660 in6_dev_put(idev); 1661 } 1662 1663 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1664 int ret = 0; 1665 1666 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1667 ret = __ipv6_regen_rndid(idev); 1668 return ret; 1669 } 1670 #endif 1671 1672 /* 1673 * Add prefix route. 1674 */ 1675 1676 static void 1677 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1678 unsigned long expires, u32 flags) 1679 { 1680 struct fib6_config cfg = { 1681 .fc_table = RT6_TABLE_PREFIX, 1682 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1683 .fc_ifindex = dev->ifindex, 1684 .fc_expires = expires, 1685 .fc_dst_len = plen, 1686 .fc_flags = RTF_UP | flags, 1687 .fc_nlinfo.nl_net = dev_net(dev), 1688 .fc_protocol = RTPROT_KERNEL, 1689 }; 1690 1691 ipv6_addr_copy(&cfg.fc_dst, pfx); 1692 1693 /* Prevent useless cloning on PtP SIT. 1694 This thing is done here expecting that the whole 1695 class of non-broadcast devices need not cloning. 1696 */ 1697 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1698 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1699 cfg.fc_flags |= RTF_NONEXTHOP; 1700 #endif 1701 1702 ip6_route_add(&cfg); 1703 } 1704 1705 /* Create "default" multicast route to the interface */ 1706 1707 static void addrconf_add_mroute(struct net_device *dev) 1708 { 1709 struct fib6_config cfg = { 1710 .fc_table = RT6_TABLE_LOCAL, 1711 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1712 .fc_ifindex = dev->ifindex, 1713 .fc_dst_len = 8, 1714 .fc_flags = RTF_UP, 1715 .fc_nlinfo.nl_net = dev_net(dev), 1716 }; 1717 1718 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1719 1720 ip6_route_add(&cfg); 1721 } 1722 1723 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1724 static void sit_route_add(struct net_device *dev) 1725 { 1726 struct fib6_config cfg = { 1727 .fc_table = RT6_TABLE_MAIN, 1728 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1729 .fc_ifindex = dev->ifindex, 1730 .fc_dst_len = 96, 1731 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1732 .fc_nlinfo.nl_net = dev_net(dev), 1733 }; 1734 1735 /* prefix length - 96 bits "::d.d.d.d" */ 1736 ip6_route_add(&cfg); 1737 } 1738 #endif 1739 1740 static void addrconf_add_lroute(struct net_device *dev) 1741 { 1742 struct in6_addr addr; 1743 1744 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1745 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1746 } 1747 1748 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1749 { 1750 struct inet6_dev *idev; 1751 1752 ASSERT_RTNL(); 1753 1754 idev = ipv6_find_idev(dev); 1755 if (!idev) 1756 return ERR_PTR(-ENOBUFS); 1757 1758 if (idev->cnf.disable_ipv6) 1759 return ERR_PTR(-EACCES); 1760 1761 /* Add default multicast route */ 1762 addrconf_add_mroute(dev); 1763 1764 /* Add link local route */ 1765 addrconf_add_lroute(dev); 1766 return idev; 1767 } 1768 1769 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1770 { 1771 struct prefix_info *pinfo; 1772 __u32 valid_lft; 1773 __u32 prefered_lft; 1774 int addr_type; 1775 struct inet6_dev *in6_dev; 1776 struct net *net = dev_net(dev); 1777 1778 pinfo = (struct prefix_info *) opt; 1779 1780 if (len < sizeof(struct prefix_info)) { 1781 ADBG(("addrconf: prefix option too short\n")); 1782 return; 1783 } 1784 1785 /* 1786 * Validation checks ([ADDRCONF], page 19) 1787 */ 1788 1789 addr_type = ipv6_addr_type(&pinfo->prefix); 1790 1791 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1792 return; 1793 1794 valid_lft = ntohl(pinfo->valid); 1795 prefered_lft = ntohl(pinfo->prefered); 1796 1797 if (prefered_lft > valid_lft) { 1798 if (net_ratelimit()) 1799 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1800 return; 1801 } 1802 1803 in6_dev = in6_dev_get(dev); 1804 1805 if (in6_dev == NULL) { 1806 if (net_ratelimit()) 1807 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1808 return; 1809 } 1810 1811 /* 1812 * Two things going on here: 1813 * 1) Add routes for on-link prefixes 1814 * 2) Configure prefixes with the auto flag set 1815 */ 1816 1817 if (pinfo->onlink) { 1818 struct rt6_info *rt; 1819 unsigned long rt_expires; 1820 1821 /* Avoid arithmetic overflow. Really, we could 1822 * save rt_expires in seconds, likely valid_lft, 1823 * but it would require division in fib gc, that it 1824 * not good. 1825 */ 1826 if (HZ > USER_HZ) 1827 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1828 else 1829 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1830 1831 if (addrconf_finite_timeout(rt_expires)) 1832 rt_expires *= HZ; 1833 1834 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1835 dev->ifindex, 1); 1836 1837 if (rt && addrconf_is_prefix_route(rt)) { 1838 /* Autoconf prefix route */ 1839 if (valid_lft == 0) { 1840 ip6_del_rt(rt); 1841 rt = NULL; 1842 } else if (addrconf_finite_timeout(rt_expires)) { 1843 /* not infinity */ 1844 rt->rt6i_expires = jiffies + rt_expires; 1845 rt->rt6i_flags |= RTF_EXPIRES; 1846 } else { 1847 rt->rt6i_flags &= ~RTF_EXPIRES; 1848 rt->rt6i_expires = 0; 1849 } 1850 } else if (valid_lft) { 1851 clock_t expires = 0; 1852 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1853 if (addrconf_finite_timeout(rt_expires)) { 1854 /* not infinity */ 1855 flags |= RTF_EXPIRES; 1856 expires = jiffies_to_clock_t(rt_expires); 1857 } 1858 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1859 dev, expires, flags); 1860 } 1861 if (rt) 1862 dst_release(&rt->dst); 1863 } 1864 1865 /* Try to figure out our local address for this prefix */ 1866 1867 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1868 struct inet6_ifaddr * ifp; 1869 struct in6_addr addr; 1870 int create = 0, update_lft = 0; 1871 1872 if (pinfo->prefix_len == 64) { 1873 memcpy(&addr, &pinfo->prefix, 8); 1874 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1875 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1876 in6_dev_put(in6_dev); 1877 return; 1878 } 1879 goto ok; 1880 } 1881 if (net_ratelimit()) 1882 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1883 pinfo->prefix_len); 1884 in6_dev_put(in6_dev); 1885 return; 1886 1887 ok: 1888 1889 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1890 1891 if (ifp == NULL && valid_lft) { 1892 int max_addresses = in6_dev->cnf.max_addresses; 1893 u32 addr_flags = 0; 1894 1895 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1896 if (in6_dev->cnf.optimistic_dad && 1897 !net->ipv6.devconf_all->forwarding) 1898 addr_flags = IFA_F_OPTIMISTIC; 1899 #endif 1900 1901 /* Do not allow to create too much of autoconfigured 1902 * addresses; this would be too easy way to crash kernel. 1903 */ 1904 if (!max_addresses || 1905 ipv6_count_addresses(in6_dev) < max_addresses) 1906 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1907 addr_type&IPV6_ADDR_SCOPE_MASK, 1908 addr_flags); 1909 1910 if (!ifp || IS_ERR(ifp)) { 1911 in6_dev_put(in6_dev); 1912 return; 1913 } 1914 1915 update_lft = create = 1; 1916 ifp->cstamp = jiffies; 1917 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1918 } 1919 1920 if (ifp) { 1921 int flags; 1922 unsigned long now; 1923 #ifdef CONFIG_IPV6_PRIVACY 1924 struct inet6_ifaddr *ift; 1925 #endif 1926 u32 stored_lft; 1927 1928 /* update lifetime (RFC2462 5.5.3 e) */ 1929 spin_lock(&ifp->lock); 1930 now = jiffies; 1931 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1932 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1933 else 1934 stored_lft = 0; 1935 if (!update_lft && stored_lft) { 1936 if (valid_lft > MIN_VALID_LIFETIME || 1937 valid_lft > stored_lft) 1938 update_lft = 1; 1939 else if (stored_lft <= MIN_VALID_LIFETIME) { 1940 /* valid_lft <= stored_lft is always true */ 1941 /* 1942 * RFC 4862 Section 5.5.3e: 1943 * "Note that the preferred lifetime of 1944 * the corresponding address is always 1945 * reset to the Preferred Lifetime in 1946 * the received Prefix Information 1947 * option, regardless of whether the 1948 * valid lifetime is also reset or 1949 * ignored." 1950 * 1951 * So if the preferred lifetime in 1952 * this advertisement is different 1953 * than what we have stored, but the 1954 * valid lifetime is invalid, just 1955 * reset prefered_lft. 1956 * 1957 * We must set the valid lifetime 1958 * to the stored lifetime since we'll 1959 * be updating the timestamp below, 1960 * else we'll set it back to the 1961 * minimum. 1962 */ 1963 if (prefered_lft != ifp->prefered_lft) { 1964 valid_lft = stored_lft; 1965 update_lft = 1; 1966 } 1967 } else { 1968 valid_lft = MIN_VALID_LIFETIME; 1969 if (valid_lft < prefered_lft) 1970 prefered_lft = valid_lft; 1971 update_lft = 1; 1972 } 1973 } 1974 1975 if (update_lft) { 1976 ifp->valid_lft = valid_lft; 1977 ifp->prefered_lft = prefered_lft; 1978 ifp->tstamp = now; 1979 flags = ifp->flags; 1980 ifp->flags &= ~IFA_F_DEPRECATED; 1981 spin_unlock(&ifp->lock); 1982 1983 if (!(flags&IFA_F_TENTATIVE)) 1984 ipv6_ifa_notify(0, ifp); 1985 } else 1986 spin_unlock(&ifp->lock); 1987 1988 #ifdef CONFIG_IPV6_PRIVACY 1989 read_lock_bh(&in6_dev->lock); 1990 /* update all temporary addresses in the list */ 1991 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) { 1992 /* 1993 * When adjusting the lifetimes of an existing 1994 * temporary address, only lower the lifetimes. 1995 * Implementations must not increase the 1996 * lifetimes of an existing temporary address 1997 * when processing a Prefix Information Option. 1998 */ 1999 if (ifp != ift->ifpub) 2000 continue; 2001 2002 spin_lock(&ift->lock); 2003 flags = ift->flags; 2004 if (ift->valid_lft > valid_lft && 2005 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 2006 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 2007 if (ift->prefered_lft > prefered_lft && 2008 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 2009 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 2010 spin_unlock(&ift->lock); 2011 if (!(flags&IFA_F_TENTATIVE)) 2012 ipv6_ifa_notify(0, ift); 2013 } 2014 2015 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2016 /* 2017 * When a new public address is created as described in [ADDRCONF], 2018 * also create a new temporary address. Also create a temporary 2019 * address if it's enabled but no temporary address currently exists. 2020 */ 2021 read_unlock_bh(&in6_dev->lock); 2022 ipv6_create_tempaddr(ifp, NULL); 2023 } else { 2024 read_unlock_bh(&in6_dev->lock); 2025 } 2026 #endif 2027 in6_ifa_put(ifp); 2028 addrconf_verify(0); 2029 } 2030 } 2031 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2032 in6_dev_put(in6_dev); 2033 } 2034 2035 /* 2036 * Set destination address. 2037 * Special case for SIT interfaces where we create a new "virtual" 2038 * device. 2039 */ 2040 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2041 { 2042 struct in6_ifreq ireq; 2043 struct net_device *dev; 2044 int err = -EINVAL; 2045 2046 rtnl_lock(); 2047 2048 err = -EFAULT; 2049 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2050 goto err_exit; 2051 2052 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2053 2054 err = -ENODEV; 2055 if (dev == NULL) 2056 goto err_exit; 2057 2058 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2059 if (dev->type == ARPHRD_SIT) { 2060 const struct net_device_ops *ops = dev->netdev_ops; 2061 struct ifreq ifr; 2062 struct ip_tunnel_parm p; 2063 2064 err = -EADDRNOTAVAIL; 2065 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2066 goto err_exit; 2067 2068 memset(&p, 0, sizeof(p)); 2069 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2070 p.iph.saddr = 0; 2071 p.iph.version = 4; 2072 p.iph.ihl = 5; 2073 p.iph.protocol = IPPROTO_IPV6; 2074 p.iph.ttl = 64; 2075 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2076 2077 if (ops->ndo_do_ioctl) { 2078 mm_segment_t oldfs = get_fs(); 2079 2080 set_fs(KERNEL_DS); 2081 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2082 set_fs(oldfs); 2083 } else 2084 err = -EOPNOTSUPP; 2085 2086 if (err == 0) { 2087 err = -ENOBUFS; 2088 dev = __dev_get_by_name(net, p.name); 2089 if (!dev) 2090 goto err_exit; 2091 err = dev_open(dev); 2092 } 2093 } 2094 #endif 2095 2096 err_exit: 2097 rtnl_unlock(); 2098 return err; 2099 } 2100 2101 /* 2102 * Manual configuration of address on an interface 2103 */ 2104 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2105 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2106 __u32 valid_lft) 2107 { 2108 struct inet6_ifaddr *ifp; 2109 struct inet6_dev *idev; 2110 struct net_device *dev; 2111 int scope; 2112 u32 flags; 2113 clock_t expires; 2114 unsigned long timeout; 2115 2116 ASSERT_RTNL(); 2117 2118 if (plen > 128) 2119 return -EINVAL; 2120 2121 /* check the lifetime */ 2122 if (!valid_lft || prefered_lft > valid_lft) 2123 return -EINVAL; 2124 2125 dev = __dev_get_by_index(net, ifindex); 2126 if (!dev) 2127 return -ENODEV; 2128 2129 idev = addrconf_add_dev(dev); 2130 if (IS_ERR(idev)) 2131 return PTR_ERR(idev); 2132 2133 scope = ipv6_addr_scope(pfx); 2134 2135 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2136 if (addrconf_finite_timeout(timeout)) { 2137 expires = jiffies_to_clock_t(timeout * HZ); 2138 valid_lft = timeout; 2139 flags = RTF_EXPIRES; 2140 } else { 2141 expires = 0; 2142 flags = 0; 2143 ifa_flags |= IFA_F_PERMANENT; 2144 } 2145 2146 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2147 if (addrconf_finite_timeout(timeout)) { 2148 if (timeout == 0) 2149 ifa_flags |= IFA_F_DEPRECATED; 2150 prefered_lft = timeout; 2151 } 2152 2153 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2154 2155 if (!IS_ERR(ifp)) { 2156 spin_lock_bh(&ifp->lock); 2157 ifp->valid_lft = valid_lft; 2158 ifp->prefered_lft = prefered_lft; 2159 ifp->tstamp = jiffies; 2160 spin_unlock_bh(&ifp->lock); 2161 2162 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2163 expires, flags); 2164 /* 2165 * Note that section 3.1 of RFC 4429 indicates 2166 * that the Optimistic flag should not be set for 2167 * manually configured addresses 2168 */ 2169 addrconf_dad_start(ifp, 0); 2170 in6_ifa_put(ifp); 2171 addrconf_verify(0); 2172 return 0; 2173 } 2174 2175 return PTR_ERR(ifp); 2176 } 2177 2178 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2179 unsigned int plen) 2180 { 2181 struct inet6_ifaddr *ifp; 2182 struct inet6_dev *idev; 2183 struct net_device *dev; 2184 2185 if (plen > 128) 2186 return -EINVAL; 2187 2188 dev = __dev_get_by_index(net, ifindex); 2189 if (!dev) 2190 return -ENODEV; 2191 2192 if ((idev = __in6_dev_get(dev)) == NULL) 2193 return -ENXIO; 2194 2195 read_lock_bh(&idev->lock); 2196 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2197 if (ifp->prefix_len == plen && 2198 ipv6_addr_equal(pfx, &ifp->addr)) { 2199 in6_ifa_hold(ifp); 2200 read_unlock_bh(&idev->lock); 2201 2202 ipv6_del_addr(ifp); 2203 2204 /* If the last address is deleted administratively, 2205 disable IPv6 on this interface. 2206 */ 2207 if (list_empty(&idev->addr_list)) 2208 addrconf_ifdown(idev->dev, 1); 2209 return 0; 2210 } 2211 } 2212 read_unlock_bh(&idev->lock); 2213 return -EADDRNOTAVAIL; 2214 } 2215 2216 2217 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2218 { 2219 struct in6_ifreq ireq; 2220 int err; 2221 2222 if (!capable(CAP_NET_ADMIN)) 2223 return -EPERM; 2224 2225 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2226 return -EFAULT; 2227 2228 rtnl_lock(); 2229 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2230 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2231 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2232 rtnl_unlock(); 2233 return err; 2234 } 2235 2236 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2237 { 2238 struct in6_ifreq ireq; 2239 int err; 2240 2241 if (!capable(CAP_NET_ADMIN)) 2242 return -EPERM; 2243 2244 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2245 return -EFAULT; 2246 2247 rtnl_lock(); 2248 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2249 ireq.ifr6_prefixlen); 2250 rtnl_unlock(); 2251 return err; 2252 } 2253 2254 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2255 int plen, int scope) 2256 { 2257 struct inet6_ifaddr *ifp; 2258 2259 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2260 if (!IS_ERR(ifp)) { 2261 spin_lock_bh(&ifp->lock); 2262 ifp->flags &= ~IFA_F_TENTATIVE; 2263 spin_unlock_bh(&ifp->lock); 2264 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2265 in6_ifa_put(ifp); 2266 } 2267 } 2268 2269 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2270 static void sit_add_v4_addrs(struct inet6_dev *idev) 2271 { 2272 struct in6_addr addr; 2273 struct net_device *dev; 2274 struct net *net = dev_net(idev->dev); 2275 int scope; 2276 2277 ASSERT_RTNL(); 2278 2279 memset(&addr, 0, sizeof(struct in6_addr)); 2280 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2281 2282 if (idev->dev->flags&IFF_POINTOPOINT) { 2283 addr.s6_addr32[0] = htonl(0xfe800000); 2284 scope = IFA_LINK; 2285 } else { 2286 scope = IPV6_ADDR_COMPATv4; 2287 } 2288 2289 if (addr.s6_addr32[3]) { 2290 add_addr(idev, &addr, 128, scope); 2291 return; 2292 } 2293 2294 for_each_netdev(net, dev) { 2295 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2296 if (in_dev && (dev->flags & IFF_UP)) { 2297 struct in_ifaddr * ifa; 2298 2299 int flag = scope; 2300 2301 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2302 int plen; 2303 2304 addr.s6_addr32[3] = ifa->ifa_local; 2305 2306 if (ifa->ifa_scope == RT_SCOPE_LINK) 2307 continue; 2308 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2309 if (idev->dev->flags&IFF_POINTOPOINT) 2310 continue; 2311 flag |= IFA_HOST; 2312 } 2313 if (idev->dev->flags&IFF_POINTOPOINT) 2314 plen = 64; 2315 else 2316 plen = 96; 2317 2318 add_addr(idev, &addr, plen, flag); 2319 } 2320 } 2321 } 2322 } 2323 #endif 2324 2325 static void init_loopback(struct net_device *dev) 2326 { 2327 struct inet6_dev *idev; 2328 2329 /* ::1 */ 2330 2331 ASSERT_RTNL(); 2332 2333 if ((idev = ipv6_find_idev(dev)) == NULL) { 2334 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2335 return; 2336 } 2337 2338 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2339 } 2340 2341 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2342 { 2343 struct inet6_ifaddr * ifp; 2344 u32 addr_flags = IFA_F_PERMANENT; 2345 2346 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2347 if (idev->cnf.optimistic_dad && 2348 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2349 addr_flags |= IFA_F_OPTIMISTIC; 2350 #endif 2351 2352 2353 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2354 if (!IS_ERR(ifp)) { 2355 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2356 addrconf_dad_start(ifp, 0); 2357 in6_ifa_put(ifp); 2358 } 2359 } 2360 2361 static void addrconf_dev_config(struct net_device *dev) 2362 { 2363 struct in6_addr addr; 2364 struct inet6_dev * idev; 2365 2366 ASSERT_RTNL(); 2367 2368 if ((dev->type != ARPHRD_ETHER) && 2369 (dev->type != ARPHRD_FDDI) && 2370 (dev->type != ARPHRD_IEEE802_TR) && 2371 (dev->type != ARPHRD_ARCNET) && 2372 (dev->type != ARPHRD_INFINIBAND)) { 2373 /* Alas, we support only Ethernet autoconfiguration. */ 2374 return; 2375 } 2376 2377 idev = addrconf_add_dev(dev); 2378 if (IS_ERR(idev)) 2379 return; 2380 2381 memset(&addr, 0, sizeof(struct in6_addr)); 2382 addr.s6_addr32[0] = htonl(0xFE800000); 2383 2384 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2385 addrconf_add_linklocal(idev, &addr); 2386 } 2387 2388 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2389 static void addrconf_sit_config(struct net_device *dev) 2390 { 2391 struct inet6_dev *idev; 2392 2393 ASSERT_RTNL(); 2394 2395 /* 2396 * Configure the tunnel with one of our IPv4 2397 * addresses... we should configure all of 2398 * our v4 addrs in the tunnel 2399 */ 2400 2401 if ((idev = ipv6_find_idev(dev)) == NULL) { 2402 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2403 return; 2404 } 2405 2406 if (dev->priv_flags & IFF_ISATAP) { 2407 struct in6_addr addr; 2408 2409 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2410 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2411 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2412 addrconf_add_linklocal(idev, &addr); 2413 return; 2414 } 2415 2416 sit_add_v4_addrs(idev); 2417 2418 if (dev->flags&IFF_POINTOPOINT) { 2419 addrconf_add_mroute(dev); 2420 addrconf_add_lroute(dev); 2421 } else 2422 sit_route_add(dev); 2423 } 2424 #endif 2425 2426 static inline int 2427 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2428 { 2429 struct in6_addr lladdr; 2430 2431 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2432 addrconf_add_linklocal(idev, &lladdr); 2433 return 0; 2434 } 2435 return -1; 2436 } 2437 2438 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2439 { 2440 struct net_device *link_dev; 2441 struct net *net = dev_net(idev->dev); 2442 2443 /* first try to inherit the link-local address from the link device */ 2444 if (idev->dev->iflink && 2445 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2446 if (!ipv6_inherit_linklocal(idev, link_dev)) 2447 return; 2448 } 2449 /* then try to inherit it from any device */ 2450 for_each_netdev(net, link_dev) { 2451 if (!ipv6_inherit_linklocal(idev, link_dev)) 2452 return; 2453 } 2454 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2455 } 2456 2457 /* 2458 * Autoconfigure tunnel with a link-local address so routing protocols, 2459 * DHCPv6, MLD etc. can be run over the virtual link 2460 */ 2461 2462 static void addrconf_ip6_tnl_config(struct net_device *dev) 2463 { 2464 struct inet6_dev *idev; 2465 2466 ASSERT_RTNL(); 2467 2468 idev = addrconf_add_dev(dev); 2469 if (IS_ERR(idev)) { 2470 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2471 return; 2472 } 2473 ip6_tnl_add_linklocal(idev); 2474 } 2475 2476 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2477 void * data) 2478 { 2479 struct net_device *dev = (struct net_device *) data; 2480 struct inet6_dev *idev = __in6_dev_get(dev); 2481 int run_pending = 0; 2482 int err; 2483 2484 switch (event) { 2485 case NETDEV_REGISTER: 2486 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2487 idev = ipv6_add_dev(dev); 2488 if (!idev) 2489 return notifier_from_errno(-ENOMEM); 2490 } 2491 break; 2492 2493 case NETDEV_UP: 2494 case NETDEV_CHANGE: 2495 if (dev->flags & IFF_SLAVE) 2496 break; 2497 2498 if (event == NETDEV_UP) { 2499 if (!addrconf_qdisc_ok(dev)) { 2500 /* device is not ready yet. */ 2501 printk(KERN_INFO 2502 "ADDRCONF(NETDEV_UP): %s: " 2503 "link is not ready\n", 2504 dev->name); 2505 break; 2506 } 2507 2508 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2509 idev = ipv6_add_dev(dev); 2510 2511 if (idev) { 2512 idev->if_flags |= IF_READY; 2513 run_pending = 1; 2514 } 2515 } else { 2516 if (!addrconf_qdisc_ok(dev)) { 2517 /* device is still not ready. */ 2518 break; 2519 } 2520 2521 if (idev) { 2522 if (idev->if_flags & IF_READY) 2523 /* device is already configured. */ 2524 break; 2525 idev->if_flags |= IF_READY; 2526 } 2527 2528 printk(KERN_INFO 2529 "ADDRCONF(NETDEV_CHANGE): %s: " 2530 "link becomes ready\n", 2531 dev->name); 2532 2533 run_pending = 1; 2534 } 2535 2536 switch (dev->type) { 2537 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2538 case ARPHRD_SIT: 2539 addrconf_sit_config(dev); 2540 break; 2541 #endif 2542 case ARPHRD_TUNNEL6: 2543 addrconf_ip6_tnl_config(dev); 2544 break; 2545 case ARPHRD_LOOPBACK: 2546 init_loopback(dev); 2547 break; 2548 2549 default: 2550 addrconf_dev_config(dev); 2551 break; 2552 } 2553 2554 if (idev) { 2555 if (run_pending) 2556 addrconf_dad_run(idev); 2557 2558 /* 2559 * If the MTU changed during the interface down, 2560 * when the interface up, the changed MTU must be 2561 * reflected in the idev as well as routers. 2562 */ 2563 if (idev->cnf.mtu6 != dev->mtu && 2564 dev->mtu >= IPV6_MIN_MTU) { 2565 rt6_mtu_change(dev, dev->mtu); 2566 idev->cnf.mtu6 = dev->mtu; 2567 } 2568 idev->tstamp = jiffies; 2569 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2570 2571 /* 2572 * If the changed mtu during down is lower than 2573 * IPV6_MIN_MTU stop IPv6 on this interface. 2574 */ 2575 if (dev->mtu < IPV6_MIN_MTU) 2576 addrconf_ifdown(dev, 1); 2577 } 2578 break; 2579 2580 case NETDEV_CHANGEMTU: 2581 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2582 rt6_mtu_change(dev, dev->mtu); 2583 idev->cnf.mtu6 = dev->mtu; 2584 break; 2585 } 2586 2587 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2588 idev = ipv6_add_dev(dev); 2589 if (idev) 2590 break; 2591 } 2592 2593 /* 2594 * MTU falled under IPV6_MIN_MTU. 2595 * Stop IPv6 on this interface. 2596 */ 2597 2598 case NETDEV_DOWN: 2599 case NETDEV_UNREGISTER: 2600 /* 2601 * Remove all addresses from this interface. 2602 */ 2603 addrconf_ifdown(dev, event != NETDEV_DOWN); 2604 break; 2605 2606 case NETDEV_CHANGENAME: 2607 if (idev) { 2608 snmp6_unregister_dev(idev); 2609 addrconf_sysctl_unregister(idev); 2610 addrconf_sysctl_register(idev); 2611 err = snmp6_register_dev(idev); 2612 if (err) 2613 return notifier_from_errno(err); 2614 } 2615 break; 2616 2617 case NETDEV_PRE_TYPE_CHANGE: 2618 case NETDEV_POST_TYPE_CHANGE: 2619 addrconf_type_change(dev, event); 2620 break; 2621 } 2622 2623 return NOTIFY_OK; 2624 } 2625 2626 /* 2627 * addrconf module should be notified of a device going up 2628 */ 2629 static struct notifier_block ipv6_dev_notf = { 2630 .notifier_call = addrconf_notify, 2631 }; 2632 2633 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2634 { 2635 struct inet6_dev *idev; 2636 ASSERT_RTNL(); 2637 2638 idev = __in6_dev_get(dev); 2639 2640 if (event == NETDEV_POST_TYPE_CHANGE) 2641 ipv6_mc_remap(idev); 2642 else if (event == NETDEV_PRE_TYPE_CHANGE) 2643 ipv6_mc_unmap(idev); 2644 } 2645 2646 static int addrconf_ifdown(struct net_device *dev, int how) 2647 { 2648 struct net *net = dev_net(dev); 2649 struct inet6_dev *idev; 2650 struct inet6_ifaddr *ifa; 2651 int state, i; 2652 2653 ASSERT_RTNL(); 2654 2655 rt6_ifdown(net, dev); 2656 neigh_ifdown(&nd_tbl, dev); 2657 2658 idev = __in6_dev_get(dev); 2659 if (idev == NULL) 2660 return -ENODEV; 2661 2662 /* 2663 * Step 1: remove reference to ipv6 device from parent device. 2664 * Do not dev_put! 2665 */ 2666 if (how) { 2667 idev->dead = 1; 2668 2669 /* protected by rtnl_lock */ 2670 rcu_assign_pointer(dev->ip6_ptr, NULL); 2671 2672 /* Step 1.5: remove snmp6 entry */ 2673 snmp6_unregister_dev(idev); 2674 2675 } 2676 2677 /* Step 2: clear hash table */ 2678 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2679 struct hlist_head *h = &inet6_addr_lst[i]; 2680 struct hlist_node *n; 2681 2682 spin_lock_bh(&addrconf_hash_lock); 2683 restart: 2684 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2685 if (ifa->idev == idev) { 2686 hlist_del_init_rcu(&ifa->addr_lst); 2687 addrconf_del_timer(ifa); 2688 goto restart; 2689 } 2690 } 2691 spin_unlock_bh(&addrconf_hash_lock); 2692 } 2693 2694 write_lock_bh(&idev->lock); 2695 2696 /* Step 2: clear flags for stateless addrconf */ 2697 if (!how) 2698 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2699 2700 #ifdef CONFIG_IPV6_PRIVACY 2701 if (how && del_timer(&idev->regen_timer)) 2702 in6_dev_put(idev); 2703 2704 /* Step 3: clear tempaddr list */ 2705 while (!list_empty(&idev->tempaddr_list)) { 2706 ifa = list_first_entry(&idev->tempaddr_list, 2707 struct inet6_ifaddr, tmp_list); 2708 list_del(&ifa->tmp_list); 2709 write_unlock_bh(&idev->lock); 2710 spin_lock_bh(&ifa->lock); 2711 2712 if (ifa->ifpub) { 2713 in6_ifa_put(ifa->ifpub); 2714 ifa->ifpub = NULL; 2715 } 2716 spin_unlock_bh(&ifa->lock); 2717 in6_ifa_put(ifa); 2718 write_lock_bh(&idev->lock); 2719 } 2720 #endif 2721 2722 while (!list_empty(&idev->addr_list)) { 2723 ifa = list_first_entry(&idev->addr_list, 2724 struct inet6_ifaddr, if_list); 2725 addrconf_del_timer(ifa); 2726 2727 list_del(&ifa->if_list); 2728 2729 write_unlock_bh(&idev->lock); 2730 2731 spin_lock_bh(&ifa->state_lock); 2732 state = ifa->state; 2733 ifa->state = INET6_IFADDR_STATE_DEAD; 2734 spin_unlock_bh(&ifa->state_lock); 2735 2736 if (state != INET6_IFADDR_STATE_DEAD) { 2737 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2738 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2739 } 2740 in6_ifa_put(ifa); 2741 2742 write_lock_bh(&idev->lock); 2743 } 2744 2745 write_unlock_bh(&idev->lock); 2746 2747 /* Step 5: Discard multicast list */ 2748 if (how) 2749 ipv6_mc_destroy_dev(idev); 2750 else 2751 ipv6_mc_down(idev); 2752 2753 idev->tstamp = jiffies; 2754 2755 /* Last: Shot the device (if unregistered) */ 2756 if (how) { 2757 addrconf_sysctl_unregister(idev); 2758 neigh_parms_release(&nd_tbl, idev->nd_parms); 2759 neigh_ifdown(&nd_tbl, dev); 2760 in6_dev_put(idev); 2761 } 2762 return 0; 2763 } 2764 2765 static void addrconf_rs_timer(unsigned long data) 2766 { 2767 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2768 struct inet6_dev *idev = ifp->idev; 2769 2770 read_lock(&idev->lock); 2771 if (idev->dead || !(idev->if_flags & IF_READY)) 2772 goto out; 2773 2774 if (idev->cnf.forwarding) 2775 goto out; 2776 2777 /* Announcement received after solicitation was sent */ 2778 if (idev->if_flags & IF_RA_RCVD) 2779 goto out; 2780 2781 spin_lock(&ifp->lock); 2782 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2783 /* The wait after the last probe can be shorter */ 2784 addrconf_mod_timer(ifp, AC_RS, 2785 (ifp->probes == idev->cnf.rtr_solicits) ? 2786 idev->cnf.rtr_solicit_delay : 2787 idev->cnf.rtr_solicit_interval); 2788 spin_unlock(&ifp->lock); 2789 2790 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2791 } else { 2792 spin_unlock(&ifp->lock); 2793 /* 2794 * Note: we do not support deprecated "all on-link" 2795 * assumption any longer. 2796 */ 2797 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2798 idev->dev->name); 2799 } 2800 2801 out: 2802 read_unlock(&idev->lock); 2803 in6_ifa_put(ifp); 2804 } 2805 2806 /* 2807 * Duplicate Address Detection 2808 */ 2809 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2810 { 2811 unsigned long rand_num; 2812 struct inet6_dev *idev = ifp->idev; 2813 2814 if (ifp->flags & IFA_F_OPTIMISTIC) 2815 rand_num = 0; 2816 else 2817 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2818 2819 ifp->probes = idev->cnf.dad_transmits; 2820 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2821 } 2822 2823 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2824 { 2825 struct inet6_dev *idev = ifp->idev; 2826 struct net_device *dev = idev->dev; 2827 2828 addrconf_join_solict(dev, &ifp->addr); 2829 2830 net_srandom(ifp->addr.s6_addr32[3]); 2831 2832 read_lock_bh(&idev->lock); 2833 spin_lock(&ifp->lock); 2834 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2835 goto out; 2836 2837 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2838 idev->cnf.accept_dad < 1 || 2839 !(ifp->flags&IFA_F_TENTATIVE) || 2840 ifp->flags & IFA_F_NODAD) { 2841 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2842 spin_unlock(&ifp->lock); 2843 read_unlock_bh(&idev->lock); 2844 2845 addrconf_dad_completed(ifp); 2846 return; 2847 } 2848 2849 if (!(idev->if_flags & IF_READY)) { 2850 spin_unlock(&ifp->lock); 2851 read_unlock_bh(&idev->lock); 2852 /* 2853 * If the device is not ready: 2854 * - keep it tentative if it is a permanent address. 2855 * - otherwise, kill it. 2856 */ 2857 in6_ifa_hold(ifp); 2858 addrconf_dad_stop(ifp, 0); 2859 return; 2860 } 2861 2862 /* 2863 * Optimistic nodes can start receiving 2864 * Frames right away 2865 */ 2866 if (ifp->flags & IFA_F_OPTIMISTIC) 2867 ip6_ins_rt(ifp->rt); 2868 2869 addrconf_dad_kick(ifp); 2870 out: 2871 spin_unlock(&ifp->lock); 2872 read_unlock_bh(&idev->lock); 2873 } 2874 2875 static void addrconf_dad_timer(unsigned long data) 2876 { 2877 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2878 struct inet6_dev *idev = ifp->idev; 2879 struct in6_addr mcaddr; 2880 2881 if (!ifp->probes && addrconf_dad_end(ifp)) 2882 goto out; 2883 2884 read_lock(&idev->lock); 2885 if (idev->dead || !(idev->if_flags & IF_READY)) { 2886 read_unlock(&idev->lock); 2887 goto out; 2888 } 2889 2890 spin_lock(&ifp->lock); 2891 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2892 spin_unlock(&ifp->lock); 2893 read_unlock(&idev->lock); 2894 goto out; 2895 } 2896 2897 if (ifp->probes == 0) { 2898 /* 2899 * DAD was successful 2900 */ 2901 2902 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2903 spin_unlock(&ifp->lock); 2904 read_unlock(&idev->lock); 2905 2906 addrconf_dad_completed(ifp); 2907 2908 goto out; 2909 } 2910 2911 ifp->probes--; 2912 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2913 spin_unlock(&ifp->lock); 2914 read_unlock(&idev->lock); 2915 2916 /* send a neighbour solicitation for our addr */ 2917 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2918 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2919 out: 2920 in6_ifa_put(ifp); 2921 } 2922 2923 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2924 { 2925 struct net_device *dev = ifp->idev->dev; 2926 2927 /* 2928 * Configure the address for reception. Now it is valid. 2929 */ 2930 2931 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2932 2933 /* If added prefix is link local and forwarding is off, 2934 start sending router solicitations. 2935 */ 2936 2937 if ((ifp->idev->cnf.forwarding == 0 || 2938 ifp->idev->cnf.forwarding == 2) && 2939 ifp->idev->cnf.rtr_solicits > 0 && 2940 (dev->flags&IFF_LOOPBACK) == 0 && 2941 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2942 /* 2943 * If a host as already performed a random delay 2944 * [...] as part of DAD [...] there is no need 2945 * to delay again before sending the first RS 2946 */ 2947 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2948 2949 spin_lock_bh(&ifp->lock); 2950 ifp->probes = 1; 2951 ifp->idev->if_flags |= IF_RS_SENT; 2952 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2953 spin_unlock_bh(&ifp->lock); 2954 } 2955 } 2956 2957 static void addrconf_dad_run(struct inet6_dev *idev) 2958 { 2959 struct inet6_ifaddr *ifp; 2960 2961 read_lock_bh(&idev->lock); 2962 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2963 spin_lock(&ifp->lock); 2964 if (ifp->flags & IFA_F_TENTATIVE && 2965 ifp->state == INET6_IFADDR_STATE_DAD) 2966 addrconf_dad_kick(ifp); 2967 spin_unlock(&ifp->lock); 2968 } 2969 read_unlock_bh(&idev->lock); 2970 } 2971 2972 #ifdef CONFIG_PROC_FS 2973 struct if6_iter_state { 2974 struct seq_net_private p; 2975 int bucket; 2976 }; 2977 2978 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2979 { 2980 struct inet6_ifaddr *ifa = NULL; 2981 struct if6_iter_state *state = seq->private; 2982 struct net *net = seq_file_net(seq); 2983 2984 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2985 struct hlist_node *n; 2986 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 2987 addr_lst) 2988 if (net_eq(dev_net(ifa->idev->dev), net)) 2989 return ifa; 2990 } 2991 return NULL; 2992 } 2993 2994 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 2995 struct inet6_ifaddr *ifa) 2996 { 2997 struct if6_iter_state *state = seq->private; 2998 struct net *net = seq_file_net(seq); 2999 struct hlist_node *n = &ifa->addr_lst; 3000 3001 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) 3002 if (net_eq(dev_net(ifa->idev->dev), net)) 3003 return ifa; 3004 3005 while (++state->bucket < IN6_ADDR_HSIZE) { 3006 hlist_for_each_entry_rcu_bh(ifa, n, 3007 &inet6_addr_lst[state->bucket], addr_lst) { 3008 if (net_eq(dev_net(ifa->idev->dev), net)) 3009 return ifa; 3010 } 3011 } 3012 3013 return NULL; 3014 } 3015 3016 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3017 { 3018 struct inet6_ifaddr *ifa = if6_get_first(seq); 3019 3020 if (ifa) 3021 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3022 --pos; 3023 return pos ? NULL : ifa; 3024 } 3025 3026 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3027 __acquires(rcu_bh) 3028 { 3029 rcu_read_lock_bh(); 3030 return if6_get_idx(seq, *pos); 3031 } 3032 3033 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3034 { 3035 struct inet6_ifaddr *ifa; 3036 3037 ifa = if6_get_next(seq, v); 3038 ++*pos; 3039 return ifa; 3040 } 3041 3042 static void if6_seq_stop(struct seq_file *seq, void *v) 3043 __releases(rcu_bh) 3044 { 3045 rcu_read_unlock_bh(); 3046 } 3047 3048 static int if6_seq_show(struct seq_file *seq, void *v) 3049 { 3050 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3051 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3052 &ifp->addr, 3053 ifp->idev->dev->ifindex, 3054 ifp->prefix_len, 3055 ifp->scope, 3056 ifp->flags, 3057 ifp->idev->dev->name); 3058 return 0; 3059 } 3060 3061 static const struct seq_operations if6_seq_ops = { 3062 .start = if6_seq_start, 3063 .next = if6_seq_next, 3064 .show = if6_seq_show, 3065 .stop = if6_seq_stop, 3066 }; 3067 3068 static int if6_seq_open(struct inode *inode, struct file *file) 3069 { 3070 return seq_open_net(inode, file, &if6_seq_ops, 3071 sizeof(struct if6_iter_state)); 3072 } 3073 3074 static const struct file_operations if6_fops = { 3075 .owner = THIS_MODULE, 3076 .open = if6_seq_open, 3077 .read = seq_read, 3078 .llseek = seq_lseek, 3079 .release = seq_release_net, 3080 }; 3081 3082 static int __net_init if6_proc_net_init(struct net *net) 3083 { 3084 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3085 return -ENOMEM; 3086 return 0; 3087 } 3088 3089 static void __net_exit if6_proc_net_exit(struct net *net) 3090 { 3091 proc_net_remove(net, "if_inet6"); 3092 } 3093 3094 static struct pernet_operations if6_proc_net_ops = { 3095 .init = if6_proc_net_init, 3096 .exit = if6_proc_net_exit, 3097 }; 3098 3099 int __init if6_proc_init(void) 3100 { 3101 return register_pernet_subsys(&if6_proc_net_ops); 3102 } 3103 3104 void if6_proc_exit(void) 3105 { 3106 unregister_pernet_subsys(&if6_proc_net_ops); 3107 } 3108 #endif /* CONFIG_PROC_FS */ 3109 3110 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3111 /* Check if address is a home address configured on any interface. */ 3112 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3113 { 3114 int ret = 0; 3115 struct inet6_ifaddr *ifp = NULL; 3116 struct hlist_node *n; 3117 unsigned int hash = ipv6_addr_hash(addr); 3118 3119 rcu_read_lock_bh(); 3120 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3121 if (!net_eq(dev_net(ifp->idev->dev), net)) 3122 continue; 3123 if (ipv6_addr_equal(&ifp->addr, addr) && 3124 (ifp->flags & IFA_F_HOMEADDRESS)) { 3125 ret = 1; 3126 break; 3127 } 3128 } 3129 rcu_read_unlock_bh(); 3130 return ret; 3131 } 3132 #endif 3133 3134 /* 3135 * Periodic address status verification 3136 */ 3137 3138 static void addrconf_verify(unsigned long foo) 3139 { 3140 unsigned long now, next, next_sec, next_sched; 3141 struct inet6_ifaddr *ifp; 3142 struct hlist_node *node; 3143 int i; 3144 3145 rcu_read_lock_bh(); 3146 spin_lock(&addrconf_verify_lock); 3147 now = jiffies; 3148 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3149 3150 del_timer(&addr_chk_timer); 3151 3152 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3153 restart: 3154 hlist_for_each_entry_rcu_bh(ifp, node, 3155 &inet6_addr_lst[i], addr_lst) { 3156 unsigned long age; 3157 3158 if (ifp->flags & IFA_F_PERMANENT) 3159 continue; 3160 3161 spin_lock(&ifp->lock); 3162 /* We try to batch several events at once. */ 3163 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3164 3165 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3166 age >= ifp->valid_lft) { 3167 spin_unlock(&ifp->lock); 3168 in6_ifa_hold(ifp); 3169 ipv6_del_addr(ifp); 3170 goto restart; 3171 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3172 spin_unlock(&ifp->lock); 3173 continue; 3174 } else if (age >= ifp->prefered_lft) { 3175 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3176 int deprecate = 0; 3177 3178 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3179 deprecate = 1; 3180 ifp->flags |= IFA_F_DEPRECATED; 3181 } 3182 3183 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3184 next = ifp->tstamp + ifp->valid_lft * HZ; 3185 3186 spin_unlock(&ifp->lock); 3187 3188 if (deprecate) { 3189 in6_ifa_hold(ifp); 3190 3191 ipv6_ifa_notify(0, ifp); 3192 in6_ifa_put(ifp); 3193 goto restart; 3194 } 3195 #ifdef CONFIG_IPV6_PRIVACY 3196 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3197 !(ifp->flags&IFA_F_TENTATIVE)) { 3198 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3199 ifp->idev->cnf.dad_transmits * 3200 ifp->idev->nd_parms->retrans_time / HZ; 3201 3202 if (age >= ifp->prefered_lft - regen_advance) { 3203 struct inet6_ifaddr *ifpub = ifp->ifpub; 3204 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3205 next = ifp->tstamp + ifp->prefered_lft * HZ; 3206 if (!ifp->regen_count && ifpub) { 3207 ifp->regen_count++; 3208 in6_ifa_hold(ifp); 3209 in6_ifa_hold(ifpub); 3210 spin_unlock(&ifp->lock); 3211 3212 spin_lock(&ifpub->lock); 3213 ifpub->regen_count = 0; 3214 spin_unlock(&ifpub->lock); 3215 ipv6_create_tempaddr(ifpub, ifp); 3216 in6_ifa_put(ifpub); 3217 in6_ifa_put(ifp); 3218 goto restart; 3219 } 3220 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3221 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3222 spin_unlock(&ifp->lock); 3223 #endif 3224 } else { 3225 /* ifp->prefered_lft <= ifp->valid_lft */ 3226 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3227 next = ifp->tstamp + ifp->prefered_lft * HZ; 3228 spin_unlock(&ifp->lock); 3229 } 3230 } 3231 } 3232 3233 next_sec = round_jiffies_up(next); 3234 next_sched = next; 3235 3236 /* If rounded timeout is accurate enough, accept it. */ 3237 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3238 next_sched = next_sec; 3239 3240 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3241 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3242 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3243 3244 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3245 now, next, next_sec, next_sched)); 3246 3247 addr_chk_timer.expires = next_sched; 3248 add_timer(&addr_chk_timer); 3249 spin_unlock(&addrconf_verify_lock); 3250 rcu_read_unlock_bh(); 3251 } 3252 3253 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3254 { 3255 struct in6_addr *pfx = NULL; 3256 3257 if (addr) 3258 pfx = nla_data(addr); 3259 3260 if (local) { 3261 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3262 pfx = NULL; 3263 else 3264 pfx = nla_data(local); 3265 } 3266 3267 return pfx; 3268 } 3269 3270 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3271 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3272 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3273 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3274 }; 3275 3276 static int 3277 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3278 { 3279 struct net *net = sock_net(skb->sk); 3280 struct ifaddrmsg *ifm; 3281 struct nlattr *tb[IFA_MAX+1]; 3282 struct in6_addr *pfx; 3283 int err; 3284 3285 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3286 if (err < 0) 3287 return err; 3288 3289 ifm = nlmsg_data(nlh); 3290 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3291 if (pfx == NULL) 3292 return -EINVAL; 3293 3294 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3295 } 3296 3297 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3298 u32 prefered_lft, u32 valid_lft) 3299 { 3300 u32 flags; 3301 clock_t expires; 3302 unsigned long timeout; 3303 3304 if (!valid_lft || (prefered_lft > valid_lft)) 3305 return -EINVAL; 3306 3307 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3308 if (addrconf_finite_timeout(timeout)) { 3309 expires = jiffies_to_clock_t(timeout * HZ); 3310 valid_lft = timeout; 3311 flags = RTF_EXPIRES; 3312 } else { 3313 expires = 0; 3314 flags = 0; 3315 ifa_flags |= IFA_F_PERMANENT; 3316 } 3317 3318 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3319 if (addrconf_finite_timeout(timeout)) { 3320 if (timeout == 0) 3321 ifa_flags |= IFA_F_DEPRECATED; 3322 prefered_lft = timeout; 3323 } 3324 3325 spin_lock_bh(&ifp->lock); 3326 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3327 ifp->tstamp = jiffies; 3328 ifp->valid_lft = valid_lft; 3329 ifp->prefered_lft = prefered_lft; 3330 3331 spin_unlock_bh(&ifp->lock); 3332 if (!(ifp->flags&IFA_F_TENTATIVE)) 3333 ipv6_ifa_notify(0, ifp); 3334 3335 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3336 expires, flags); 3337 addrconf_verify(0); 3338 3339 return 0; 3340 } 3341 3342 static int 3343 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3344 { 3345 struct net *net = sock_net(skb->sk); 3346 struct ifaddrmsg *ifm; 3347 struct nlattr *tb[IFA_MAX+1]; 3348 struct in6_addr *pfx; 3349 struct inet6_ifaddr *ifa; 3350 struct net_device *dev; 3351 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3352 u8 ifa_flags; 3353 int err; 3354 3355 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3356 if (err < 0) 3357 return err; 3358 3359 ifm = nlmsg_data(nlh); 3360 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3361 if (pfx == NULL) 3362 return -EINVAL; 3363 3364 if (tb[IFA_CACHEINFO]) { 3365 struct ifa_cacheinfo *ci; 3366 3367 ci = nla_data(tb[IFA_CACHEINFO]); 3368 valid_lft = ci->ifa_valid; 3369 preferred_lft = ci->ifa_prefered; 3370 } else { 3371 preferred_lft = INFINITY_LIFE_TIME; 3372 valid_lft = INFINITY_LIFE_TIME; 3373 } 3374 3375 dev = __dev_get_by_index(net, ifm->ifa_index); 3376 if (dev == NULL) 3377 return -ENODEV; 3378 3379 /* We ignore other flags so far. */ 3380 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3381 3382 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3383 if (ifa == NULL) { 3384 /* 3385 * It would be best to check for !NLM_F_CREATE here but 3386 * userspace alreay relies on not having to provide this. 3387 */ 3388 return inet6_addr_add(net, ifm->ifa_index, pfx, 3389 ifm->ifa_prefixlen, ifa_flags, 3390 preferred_lft, valid_lft); 3391 } 3392 3393 if (nlh->nlmsg_flags & NLM_F_EXCL || 3394 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3395 err = -EEXIST; 3396 else 3397 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3398 3399 in6_ifa_put(ifa); 3400 3401 return err; 3402 } 3403 3404 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3405 u8 scope, int ifindex) 3406 { 3407 struct ifaddrmsg *ifm; 3408 3409 ifm = nlmsg_data(nlh); 3410 ifm->ifa_family = AF_INET6; 3411 ifm->ifa_prefixlen = prefixlen; 3412 ifm->ifa_flags = flags; 3413 ifm->ifa_scope = scope; 3414 ifm->ifa_index = ifindex; 3415 } 3416 3417 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3418 unsigned long tstamp, u32 preferred, u32 valid) 3419 { 3420 struct ifa_cacheinfo ci; 3421 3422 ci.cstamp = cstamp_delta(cstamp); 3423 ci.tstamp = cstamp_delta(tstamp); 3424 ci.ifa_prefered = preferred; 3425 ci.ifa_valid = valid; 3426 3427 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3428 } 3429 3430 static inline int rt_scope(int ifa_scope) 3431 { 3432 if (ifa_scope & IFA_HOST) 3433 return RT_SCOPE_HOST; 3434 else if (ifa_scope & IFA_LINK) 3435 return RT_SCOPE_LINK; 3436 else if (ifa_scope & IFA_SITE) 3437 return RT_SCOPE_SITE; 3438 else 3439 return RT_SCOPE_UNIVERSE; 3440 } 3441 3442 static inline int inet6_ifaddr_msgsize(void) 3443 { 3444 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3445 + nla_total_size(16) /* IFA_ADDRESS */ 3446 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3447 } 3448 3449 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3450 u32 pid, u32 seq, int event, unsigned int flags) 3451 { 3452 struct nlmsghdr *nlh; 3453 u32 preferred, valid; 3454 3455 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3456 if (nlh == NULL) 3457 return -EMSGSIZE; 3458 3459 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3460 ifa->idev->dev->ifindex); 3461 3462 if (!(ifa->flags&IFA_F_PERMANENT)) { 3463 preferred = ifa->prefered_lft; 3464 valid = ifa->valid_lft; 3465 if (preferred != INFINITY_LIFE_TIME) { 3466 long tval = (jiffies - ifa->tstamp)/HZ; 3467 if (preferred > tval) 3468 preferred -= tval; 3469 else 3470 preferred = 0; 3471 if (valid != INFINITY_LIFE_TIME) { 3472 if (valid > tval) 3473 valid -= tval; 3474 else 3475 valid = 0; 3476 } 3477 } 3478 } else { 3479 preferred = INFINITY_LIFE_TIME; 3480 valid = INFINITY_LIFE_TIME; 3481 } 3482 3483 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3484 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3485 nlmsg_cancel(skb, nlh); 3486 return -EMSGSIZE; 3487 } 3488 3489 return nlmsg_end(skb, nlh); 3490 } 3491 3492 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3493 u32 pid, u32 seq, int event, u16 flags) 3494 { 3495 struct nlmsghdr *nlh; 3496 u8 scope = RT_SCOPE_UNIVERSE; 3497 int ifindex = ifmca->idev->dev->ifindex; 3498 3499 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3500 scope = RT_SCOPE_SITE; 3501 3502 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3503 if (nlh == NULL) 3504 return -EMSGSIZE; 3505 3506 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3507 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3508 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3509 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3510 nlmsg_cancel(skb, nlh); 3511 return -EMSGSIZE; 3512 } 3513 3514 return nlmsg_end(skb, nlh); 3515 } 3516 3517 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3518 u32 pid, u32 seq, int event, unsigned int flags) 3519 { 3520 struct nlmsghdr *nlh; 3521 u8 scope = RT_SCOPE_UNIVERSE; 3522 int ifindex = ifaca->aca_idev->dev->ifindex; 3523 3524 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3525 scope = RT_SCOPE_SITE; 3526 3527 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3528 if (nlh == NULL) 3529 return -EMSGSIZE; 3530 3531 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3532 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3533 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3534 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3535 nlmsg_cancel(skb, nlh); 3536 return -EMSGSIZE; 3537 } 3538 3539 return nlmsg_end(skb, nlh); 3540 } 3541 3542 enum addr_type_t { 3543 UNICAST_ADDR, 3544 MULTICAST_ADDR, 3545 ANYCAST_ADDR, 3546 }; 3547 3548 /* called with rcu_read_lock() */ 3549 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3550 struct netlink_callback *cb, enum addr_type_t type, 3551 int s_ip_idx, int *p_ip_idx) 3552 { 3553 struct ifmcaddr6 *ifmca; 3554 struct ifacaddr6 *ifaca; 3555 int err = 1; 3556 int ip_idx = *p_ip_idx; 3557 3558 read_lock_bh(&idev->lock); 3559 switch (type) { 3560 case UNICAST_ADDR: { 3561 struct inet6_ifaddr *ifa; 3562 3563 /* unicast address incl. temp addr */ 3564 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3565 if (++ip_idx < s_ip_idx) 3566 continue; 3567 err = inet6_fill_ifaddr(skb, ifa, 3568 NETLINK_CB(cb->skb).pid, 3569 cb->nlh->nlmsg_seq, 3570 RTM_NEWADDR, 3571 NLM_F_MULTI); 3572 if (err <= 0) 3573 break; 3574 } 3575 break; 3576 } 3577 case MULTICAST_ADDR: 3578 /* multicast address */ 3579 for (ifmca = idev->mc_list; ifmca; 3580 ifmca = ifmca->next, ip_idx++) { 3581 if (ip_idx < s_ip_idx) 3582 continue; 3583 err = inet6_fill_ifmcaddr(skb, ifmca, 3584 NETLINK_CB(cb->skb).pid, 3585 cb->nlh->nlmsg_seq, 3586 RTM_GETMULTICAST, 3587 NLM_F_MULTI); 3588 if (err <= 0) 3589 break; 3590 } 3591 break; 3592 case ANYCAST_ADDR: 3593 /* anycast address */ 3594 for (ifaca = idev->ac_list; ifaca; 3595 ifaca = ifaca->aca_next, ip_idx++) { 3596 if (ip_idx < s_ip_idx) 3597 continue; 3598 err = inet6_fill_ifacaddr(skb, ifaca, 3599 NETLINK_CB(cb->skb).pid, 3600 cb->nlh->nlmsg_seq, 3601 RTM_GETANYCAST, 3602 NLM_F_MULTI); 3603 if (err <= 0) 3604 break; 3605 } 3606 break; 3607 default: 3608 break; 3609 } 3610 read_unlock_bh(&idev->lock); 3611 *p_ip_idx = ip_idx; 3612 return err; 3613 } 3614 3615 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3616 enum addr_type_t type) 3617 { 3618 struct net *net = sock_net(skb->sk); 3619 int h, s_h; 3620 int idx, ip_idx; 3621 int s_idx, s_ip_idx; 3622 struct net_device *dev; 3623 struct inet6_dev *idev; 3624 struct hlist_head *head; 3625 struct hlist_node *node; 3626 3627 s_h = cb->args[0]; 3628 s_idx = idx = cb->args[1]; 3629 s_ip_idx = ip_idx = cb->args[2]; 3630 3631 rcu_read_lock(); 3632 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3633 idx = 0; 3634 head = &net->dev_index_head[h]; 3635 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3636 if (idx < s_idx) 3637 goto cont; 3638 if (h > s_h || idx > s_idx) 3639 s_ip_idx = 0; 3640 ip_idx = 0; 3641 idev = __in6_dev_get(dev); 3642 if (!idev) 3643 goto cont; 3644 3645 if (in6_dump_addrs(idev, skb, cb, type, 3646 s_ip_idx, &ip_idx) <= 0) 3647 goto done; 3648 cont: 3649 idx++; 3650 } 3651 } 3652 done: 3653 rcu_read_unlock(); 3654 cb->args[0] = h; 3655 cb->args[1] = idx; 3656 cb->args[2] = ip_idx; 3657 3658 return skb->len; 3659 } 3660 3661 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3662 { 3663 enum addr_type_t type = UNICAST_ADDR; 3664 3665 return inet6_dump_addr(skb, cb, type); 3666 } 3667 3668 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3669 { 3670 enum addr_type_t type = MULTICAST_ADDR; 3671 3672 return inet6_dump_addr(skb, cb, type); 3673 } 3674 3675 3676 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3677 { 3678 enum addr_type_t type = ANYCAST_ADDR; 3679 3680 return inet6_dump_addr(skb, cb, type); 3681 } 3682 3683 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3684 void *arg) 3685 { 3686 struct net *net = sock_net(in_skb->sk); 3687 struct ifaddrmsg *ifm; 3688 struct nlattr *tb[IFA_MAX+1]; 3689 struct in6_addr *addr = NULL; 3690 struct net_device *dev = NULL; 3691 struct inet6_ifaddr *ifa; 3692 struct sk_buff *skb; 3693 int err; 3694 3695 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3696 if (err < 0) 3697 goto errout; 3698 3699 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3700 if (addr == NULL) { 3701 err = -EINVAL; 3702 goto errout; 3703 } 3704 3705 ifm = nlmsg_data(nlh); 3706 if (ifm->ifa_index) 3707 dev = __dev_get_by_index(net, ifm->ifa_index); 3708 3709 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3710 if (!ifa) { 3711 err = -EADDRNOTAVAIL; 3712 goto errout; 3713 } 3714 3715 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3716 if (!skb) { 3717 err = -ENOBUFS; 3718 goto errout_ifa; 3719 } 3720 3721 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3722 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3723 if (err < 0) { 3724 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3725 WARN_ON(err == -EMSGSIZE); 3726 kfree_skb(skb); 3727 goto errout_ifa; 3728 } 3729 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3730 errout_ifa: 3731 in6_ifa_put(ifa); 3732 errout: 3733 return err; 3734 } 3735 3736 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3737 { 3738 struct sk_buff *skb; 3739 struct net *net = dev_net(ifa->idev->dev); 3740 int err = -ENOBUFS; 3741 3742 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3743 if (skb == NULL) 3744 goto errout; 3745 3746 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3747 if (err < 0) { 3748 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3749 WARN_ON(err == -EMSGSIZE); 3750 kfree_skb(skb); 3751 goto errout; 3752 } 3753 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3754 return; 3755 errout: 3756 if (err < 0) 3757 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3758 } 3759 3760 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3761 __s32 *array, int bytes) 3762 { 3763 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3764 3765 memset(array, 0, bytes); 3766 array[DEVCONF_FORWARDING] = cnf->forwarding; 3767 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3768 array[DEVCONF_MTU6] = cnf->mtu6; 3769 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3770 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3771 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3772 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3773 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3774 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3775 jiffies_to_msecs(cnf->rtr_solicit_interval); 3776 array[DEVCONF_RTR_SOLICIT_DELAY] = 3777 jiffies_to_msecs(cnf->rtr_solicit_delay); 3778 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3779 #ifdef CONFIG_IPV6_PRIVACY 3780 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3781 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3782 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3783 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3784 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3785 #endif 3786 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3787 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3788 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3789 #ifdef CONFIG_IPV6_ROUTER_PREF 3790 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3791 array[DEVCONF_RTR_PROBE_INTERVAL] = 3792 jiffies_to_msecs(cnf->rtr_probe_interval); 3793 #ifdef CONFIG_IPV6_ROUTE_INFO 3794 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3795 #endif 3796 #endif 3797 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3798 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3799 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3800 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3801 #endif 3802 #ifdef CONFIG_IPV6_MROUTE 3803 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3804 #endif 3805 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3806 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3807 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3808 } 3809 3810 static inline size_t inet6_ifla6_size(void) 3811 { 3812 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3813 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3814 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3815 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3816 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3817 } 3818 3819 static inline size_t inet6_if_nlmsg_size(void) 3820 { 3821 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3822 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3823 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3824 + nla_total_size(4) /* IFLA_MTU */ 3825 + nla_total_size(4) /* IFLA_LINK */ 3826 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3827 } 3828 3829 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3830 int items, int bytes) 3831 { 3832 int i; 3833 int pad = bytes - sizeof(u64) * items; 3834 BUG_ON(pad < 0); 3835 3836 /* Use put_unaligned() because stats may not be aligned for u64. */ 3837 put_unaligned(items, &stats[0]); 3838 for (i = 1; i < items; i++) 3839 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3840 3841 memset(&stats[items], 0, pad); 3842 } 3843 3844 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3845 int items, int bytes, size_t syncpoff) 3846 { 3847 int i; 3848 int pad = bytes - sizeof(u64) * items; 3849 BUG_ON(pad < 0); 3850 3851 /* Use put_unaligned() because stats may not be aligned for u64. */ 3852 put_unaligned(items, &stats[0]); 3853 for (i = 1; i < items; i++) 3854 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3855 3856 memset(&stats[items], 0, pad); 3857 } 3858 3859 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3860 int bytes) 3861 { 3862 switch (attrtype) { 3863 case IFLA_INET6_STATS: 3864 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3865 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3866 break; 3867 case IFLA_INET6_ICMP6STATS: 3868 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3869 break; 3870 } 3871 } 3872 3873 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3874 { 3875 struct nlattr *nla; 3876 struct ifla_cacheinfo ci; 3877 3878 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3879 3880 ci.max_reasm_len = IPV6_MAXPLEN; 3881 ci.tstamp = cstamp_delta(idev->tstamp); 3882 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3883 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3884 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3885 3886 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3887 if (nla == NULL) 3888 goto nla_put_failure; 3889 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3890 3891 /* XXX - MC not implemented */ 3892 3893 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3894 if (nla == NULL) 3895 goto nla_put_failure; 3896 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3897 3898 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3899 if (nla == NULL) 3900 goto nla_put_failure; 3901 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3902 3903 return 0; 3904 3905 nla_put_failure: 3906 return -EMSGSIZE; 3907 } 3908 3909 static size_t inet6_get_link_af_size(const struct net_device *dev) 3910 { 3911 if (!__in6_dev_get(dev)) 3912 return 0; 3913 3914 return inet6_ifla6_size(); 3915 } 3916 3917 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 3918 { 3919 struct inet6_dev *idev = __in6_dev_get(dev); 3920 3921 if (!idev) 3922 return -ENODATA; 3923 3924 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 3925 return -EMSGSIZE; 3926 3927 return 0; 3928 } 3929 3930 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3931 u32 pid, u32 seq, int event, unsigned int flags) 3932 { 3933 struct net_device *dev = idev->dev; 3934 struct ifinfomsg *hdr; 3935 struct nlmsghdr *nlh; 3936 void *protoinfo; 3937 3938 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3939 if (nlh == NULL) 3940 return -EMSGSIZE; 3941 3942 hdr = nlmsg_data(nlh); 3943 hdr->ifi_family = AF_INET6; 3944 hdr->__ifi_pad = 0; 3945 hdr->ifi_type = dev->type; 3946 hdr->ifi_index = dev->ifindex; 3947 hdr->ifi_flags = dev_get_flags(dev); 3948 hdr->ifi_change = 0; 3949 3950 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3951 3952 if (dev->addr_len) 3953 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3954 3955 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3956 if (dev->ifindex != dev->iflink) 3957 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3958 3959 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3960 if (protoinfo == NULL) 3961 goto nla_put_failure; 3962 3963 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 3964 goto nla_put_failure; 3965 3966 nla_nest_end(skb, protoinfo); 3967 return nlmsg_end(skb, nlh); 3968 3969 nla_put_failure: 3970 nlmsg_cancel(skb, nlh); 3971 return -EMSGSIZE; 3972 } 3973 3974 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3975 { 3976 struct net *net = sock_net(skb->sk); 3977 int h, s_h; 3978 int idx = 0, s_idx; 3979 struct net_device *dev; 3980 struct inet6_dev *idev; 3981 struct hlist_head *head; 3982 struct hlist_node *node; 3983 3984 s_h = cb->args[0]; 3985 s_idx = cb->args[1]; 3986 3987 rcu_read_lock(); 3988 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3989 idx = 0; 3990 head = &net->dev_index_head[h]; 3991 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3992 if (idx < s_idx) 3993 goto cont; 3994 idev = __in6_dev_get(dev); 3995 if (!idev) 3996 goto cont; 3997 if (inet6_fill_ifinfo(skb, idev, 3998 NETLINK_CB(cb->skb).pid, 3999 cb->nlh->nlmsg_seq, 4000 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4001 goto out; 4002 cont: 4003 idx++; 4004 } 4005 } 4006 out: 4007 rcu_read_unlock(); 4008 cb->args[1] = idx; 4009 cb->args[0] = h; 4010 4011 return skb->len; 4012 } 4013 4014 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4015 { 4016 struct sk_buff *skb; 4017 struct net *net = dev_net(idev->dev); 4018 int err = -ENOBUFS; 4019 4020 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4021 if (skb == NULL) 4022 goto errout; 4023 4024 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4025 if (err < 0) { 4026 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4027 WARN_ON(err == -EMSGSIZE); 4028 kfree_skb(skb); 4029 goto errout; 4030 } 4031 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4032 return; 4033 errout: 4034 if (err < 0) 4035 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4036 } 4037 4038 static inline size_t inet6_prefix_nlmsg_size(void) 4039 { 4040 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4041 + nla_total_size(sizeof(struct in6_addr)) 4042 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4043 } 4044 4045 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4046 struct prefix_info *pinfo, u32 pid, u32 seq, 4047 int event, unsigned int flags) 4048 { 4049 struct prefixmsg *pmsg; 4050 struct nlmsghdr *nlh; 4051 struct prefix_cacheinfo ci; 4052 4053 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4054 if (nlh == NULL) 4055 return -EMSGSIZE; 4056 4057 pmsg = nlmsg_data(nlh); 4058 pmsg->prefix_family = AF_INET6; 4059 pmsg->prefix_pad1 = 0; 4060 pmsg->prefix_pad2 = 0; 4061 pmsg->prefix_ifindex = idev->dev->ifindex; 4062 pmsg->prefix_len = pinfo->prefix_len; 4063 pmsg->prefix_type = pinfo->type; 4064 pmsg->prefix_pad3 = 0; 4065 pmsg->prefix_flags = 0; 4066 if (pinfo->onlink) 4067 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4068 if (pinfo->autoconf) 4069 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4070 4071 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4072 4073 ci.preferred_time = ntohl(pinfo->prefered); 4074 ci.valid_time = ntohl(pinfo->valid); 4075 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4076 4077 return nlmsg_end(skb, nlh); 4078 4079 nla_put_failure: 4080 nlmsg_cancel(skb, nlh); 4081 return -EMSGSIZE; 4082 } 4083 4084 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4085 struct prefix_info *pinfo) 4086 { 4087 struct sk_buff *skb; 4088 struct net *net = dev_net(idev->dev); 4089 int err = -ENOBUFS; 4090 4091 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4092 if (skb == NULL) 4093 goto errout; 4094 4095 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4096 if (err < 0) { 4097 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4098 WARN_ON(err == -EMSGSIZE); 4099 kfree_skb(skb); 4100 goto errout; 4101 } 4102 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4103 return; 4104 errout: 4105 if (err < 0) 4106 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4107 } 4108 4109 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4110 { 4111 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4112 4113 switch (event) { 4114 case RTM_NEWADDR: 4115 /* 4116 * If the address was optimistic 4117 * we inserted the route at the start of 4118 * our DAD process, so we don't need 4119 * to do it again 4120 */ 4121 if (!(ifp->rt->rt6i_node)) 4122 ip6_ins_rt(ifp->rt); 4123 if (ifp->idev->cnf.forwarding) 4124 addrconf_join_anycast(ifp); 4125 break; 4126 case RTM_DELADDR: 4127 if (ifp->idev->cnf.forwarding) 4128 addrconf_leave_anycast(ifp); 4129 addrconf_leave_solict(ifp->idev, &ifp->addr); 4130 dst_hold(&ifp->rt->dst); 4131 4132 if (ip6_del_rt(ifp->rt)) 4133 dst_free(&ifp->rt->dst); 4134 break; 4135 } 4136 } 4137 4138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4139 { 4140 rcu_read_lock_bh(); 4141 if (likely(ifp->idev->dead == 0)) 4142 __ipv6_ifa_notify(event, ifp); 4143 rcu_read_unlock_bh(); 4144 } 4145 4146 #ifdef CONFIG_SYSCTL 4147 4148 static 4149 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4150 void __user *buffer, size_t *lenp, loff_t *ppos) 4151 { 4152 int *valp = ctl->data; 4153 int val = *valp; 4154 loff_t pos = *ppos; 4155 int ret; 4156 4157 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4158 4159 if (write) 4160 ret = addrconf_fixup_forwarding(ctl, valp, val); 4161 if (ret) 4162 *ppos = pos; 4163 return ret; 4164 } 4165 4166 static void dev_disable_change(struct inet6_dev *idev) 4167 { 4168 if (!idev || !idev->dev) 4169 return; 4170 4171 if (idev->cnf.disable_ipv6) 4172 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4173 else 4174 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4175 } 4176 4177 static void addrconf_disable_change(struct net *net, __s32 newf) 4178 { 4179 struct net_device *dev; 4180 struct inet6_dev *idev; 4181 4182 rcu_read_lock(); 4183 for_each_netdev_rcu(net, dev) { 4184 idev = __in6_dev_get(dev); 4185 if (idev) { 4186 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4187 idev->cnf.disable_ipv6 = newf; 4188 if (changed) 4189 dev_disable_change(idev); 4190 } 4191 } 4192 rcu_read_unlock(); 4193 } 4194 4195 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4196 { 4197 struct net *net; 4198 4199 net = (struct net *)table->extra2; 4200 4201 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4202 return 0; 4203 4204 if (!rtnl_trylock()) { 4205 /* Restore the original values before restarting */ 4206 *p = old; 4207 return restart_syscall(); 4208 } 4209 4210 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4211 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4212 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4213 addrconf_disable_change(net, newf); 4214 } else if ((!*p) ^ (!old)) 4215 dev_disable_change((struct inet6_dev *)table->extra1); 4216 4217 rtnl_unlock(); 4218 return 0; 4219 } 4220 4221 static 4222 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4223 void __user *buffer, size_t *lenp, loff_t *ppos) 4224 { 4225 int *valp = ctl->data; 4226 int val = *valp; 4227 loff_t pos = *ppos; 4228 int ret; 4229 4230 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4231 4232 if (write) 4233 ret = addrconf_disable_ipv6(ctl, valp, val); 4234 if (ret) 4235 *ppos = pos; 4236 return ret; 4237 } 4238 4239 static struct addrconf_sysctl_table 4240 { 4241 struct ctl_table_header *sysctl_header; 4242 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4243 char *dev_name; 4244 } addrconf_sysctl __read_mostly = { 4245 .sysctl_header = NULL, 4246 .addrconf_vars = { 4247 { 4248 .procname = "forwarding", 4249 .data = &ipv6_devconf.forwarding, 4250 .maxlen = sizeof(int), 4251 .mode = 0644, 4252 .proc_handler = addrconf_sysctl_forward, 4253 }, 4254 { 4255 .procname = "hop_limit", 4256 .data = &ipv6_devconf.hop_limit, 4257 .maxlen = sizeof(int), 4258 .mode = 0644, 4259 .proc_handler = proc_dointvec, 4260 }, 4261 { 4262 .procname = "mtu", 4263 .data = &ipv6_devconf.mtu6, 4264 .maxlen = sizeof(int), 4265 .mode = 0644, 4266 .proc_handler = proc_dointvec, 4267 }, 4268 { 4269 .procname = "accept_ra", 4270 .data = &ipv6_devconf.accept_ra, 4271 .maxlen = sizeof(int), 4272 .mode = 0644, 4273 .proc_handler = proc_dointvec, 4274 }, 4275 { 4276 .procname = "accept_redirects", 4277 .data = &ipv6_devconf.accept_redirects, 4278 .maxlen = sizeof(int), 4279 .mode = 0644, 4280 .proc_handler = proc_dointvec, 4281 }, 4282 { 4283 .procname = "autoconf", 4284 .data = &ipv6_devconf.autoconf, 4285 .maxlen = sizeof(int), 4286 .mode = 0644, 4287 .proc_handler = proc_dointvec, 4288 }, 4289 { 4290 .procname = "dad_transmits", 4291 .data = &ipv6_devconf.dad_transmits, 4292 .maxlen = sizeof(int), 4293 .mode = 0644, 4294 .proc_handler = proc_dointvec, 4295 }, 4296 { 4297 .procname = "router_solicitations", 4298 .data = &ipv6_devconf.rtr_solicits, 4299 .maxlen = sizeof(int), 4300 .mode = 0644, 4301 .proc_handler = proc_dointvec, 4302 }, 4303 { 4304 .procname = "router_solicitation_interval", 4305 .data = &ipv6_devconf.rtr_solicit_interval, 4306 .maxlen = sizeof(int), 4307 .mode = 0644, 4308 .proc_handler = proc_dointvec_jiffies, 4309 }, 4310 { 4311 .procname = "router_solicitation_delay", 4312 .data = &ipv6_devconf.rtr_solicit_delay, 4313 .maxlen = sizeof(int), 4314 .mode = 0644, 4315 .proc_handler = proc_dointvec_jiffies, 4316 }, 4317 { 4318 .procname = "force_mld_version", 4319 .data = &ipv6_devconf.force_mld_version, 4320 .maxlen = sizeof(int), 4321 .mode = 0644, 4322 .proc_handler = proc_dointvec, 4323 }, 4324 #ifdef CONFIG_IPV6_PRIVACY 4325 { 4326 .procname = "use_tempaddr", 4327 .data = &ipv6_devconf.use_tempaddr, 4328 .maxlen = sizeof(int), 4329 .mode = 0644, 4330 .proc_handler = proc_dointvec, 4331 }, 4332 { 4333 .procname = "temp_valid_lft", 4334 .data = &ipv6_devconf.temp_valid_lft, 4335 .maxlen = sizeof(int), 4336 .mode = 0644, 4337 .proc_handler = proc_dointvec, 4338 }, 4339 { 4340 .procname = "temp_prefered_lft", 4341 .data = &ipv6_devconf.temp_prefered_lft, 4342 .maxlen = sizeof(int), 4343 .mode = 0644, 4344 .proc_handler = proc_dointvec, 4345 }, 4346 { 4347 .procname = "regen_max_retry", 4348 .data = &ipv6_devconf.regen_max_retry, 4349 .maxlen = sizeof(int), 4350 .mode = 0644, 4351 .proc_handler = proc_dointvec, 4352 }, 4353 { 4354 .procname = "max_desync_factor", 4355 .data = &ipv6_devconf.max_desync_factor, 4356 .maxlen = sizeof(int), 4357 .mode = 0644, 4358 .proc_handler = proc_dointvec, 4359 }, 4360 #endif 4361 { 4362 .procname = "max_addresses", 4363 .data = &ipv6_devconf.max_addresses, 4364 .maxlen = sizeof(int), 4365 .mode = 0644, 4366 .proc_handler = proc_dointvec, 4367 }, 4368 { 4369 .procname = "accept_ra_defrtr", 4370 .data = &ipv6_devconf.accept_ra_defrtr, 4371 .maxlen = sizeof(int), 4372 .mode = 0644, 4373 .proc_handler = proc_dointvec, 4374 }, 4375 { 4376 .procname = "accept_ra_pinfo", 4377 .data = &ipv6_devconf.accept_ra_pinfo, 4378 .maxlen = sizeof(int), 4379 .mode = 0644, 4380 .proc_handler = proc_dointvec, 4381 }, 4382 #ifdef CONFIG_IPV6_ROUTER_PREF 4383 { 4384 .procname = "accept_ra_rtr_pref", 4385 .data = &ipv6_devconf.accept_ra_rtr_pref, 4386 .maxlen = sizeof(int), 4387 .mode = 0644, 4388 .proc_handler = proc_dointvec, 4389 }, 4390 { 4391 .procname = "router_probe_interval", 4392 .data = &ipv6_devconf.rtr_probe_interval, 4393 .maxlen = sizeof(int), 4394 .mode = 0644, 4395 .proc_handler = proc_dointvec_jiffies, 4396 }, 4397 #ifdef CONFIG_IPV6_ROUTE_INFO 4398 { 4399 .procname = "accept_ra_rt_info_max_plen", 4400 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4401 .maxlen = sizeof(int), 4402 .mode = 0644, 4403 .proc_handler = proc_dointvec, 4404 }, 4405 #endif 4406 #endif 4407 { 4408 .procname = "proxy_ndp", 4409 .data = &ipv6_devconf.proxy_ndp, 4410 .maxlen = sizeof(int), 4411 .mode = 0644, 4412 .proc_handler = proc_dointvec, 4413 }, 4414 { 4415 .procname = "accept_source_route", 4416 .data = &ipv6_devconf.accept_source_route, 4417 .maxlen = sizeof(int), 4418 .mode = 0644, 4419 .proc_handler = proc_dointvec, 4420 }, 4421 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4422 { 4423 .procname = "optimistic_dad", 4424 .data = &ipv6_devconf.optimistic_dad, 4425 .maxlen = sizeof(int), 4426 .mode = 0644, 4427 .proc_handler = proc_dointvec, 4428 4429 }, 4430 #endif 4431 #ifdef CONFIG_IPV6_MROUTE 4432 { 4433 .procname = "mc_forwarding", 4434 .data = &ipv6_devconf.mc_forwarding, 4435 .maxlen = sizeof(int), 4436 .mode = 0444, 4437 .proc_handler = proc_dointvec, 4438 }, 4439 #endif 4440 { 4441 .procname = "disable_ipv6", 4442 .data = &ipv6_devconf.disable_ipv6, 4443 .maxlen = sizeof(int), 4444 .mode = 0644, 4445 .proc_handler = addrconf_sysctl_disable, 4446 }, 4447 { 4448 .procname = "accept_dad", 4449 .data = &ipv6_devconf.accept_dad, 4450 .maxlen = sizeof(int), 4451 .mode = 0644, 4452 .proc_handler = proc_dointvec, 4453 }, 4454 { 4455 .procname = "force_tllao", 4456 .data = &ipv6_devconf.force_tllao, 4457 .maxlen = sizeof(int), 4458 .mode = 0644, 4459 .proc_handler = proc_dointvec 4460 }, 4461 { 4462 /* sentinel */ 4463 } 4464 }, 4465 }; 4466 4467 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4468 struct inet6_dev *idev, struct ipv6_devconf *p) 4469 { 4470 int i; 4471 struct addrconf_sysctl_table *t; 4472 4473 #define ADDRCONF_CTL_PATH_DEV 3 4474 4475 struct ctl_path addrconf_ctl_path[] = { 4476 { .procname = "net", }, 4477 { .procname = "ipv6", }, 4478 { .procname = "conf", }, 4479 { /* to be set */ }, 4480 { }, 4481 }; 4482 4483 4484 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4485 if (t == NULL) 4486 goto out; 4487 4488 for (i = 0; t->addrconf_vars[i].data; i++) { 4489 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4490 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4491 t->addrconf_vars[i].extra2 = net; 4492 } 4493 4494 /* 4495 * Make a copy of dev_name, because '.procname' is regarded as const 4496 * by sysctl and we wouldn't want anyone to change it under our feet 4497 * (see SIOCSIFNAME). 4498 */ 4499 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4500 if (!t->dev_name) 4501 goto free; 4502 4503 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4504 4505 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4506 t->addrconf_vars); 4507 if (t->sysctl_header == NULL) 4508 goto free_procname; 4509 4510 p->sysctl = t; 4511 return 0; 4512 4513 free_procname: 4514 kfree(t->dev_name); 4515 free: 4516 kfree(t); 4517 out: 4518 return -ENOBUFS; 4519 } 4520 4521 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4522 { 4523 struct addrconf_sysctl_table *t; 4524 4525 if (p->sysctl == NULL) 4526 return; 4527 4528 t = p->sysctl; 4529 p->sysctl = NULL; 4530 unregister_net_sysctl_table(t->sysctl_header); 4531 kfree(t->dev_name); 4532 kfree(t); 4533 } 4534 4535 static void addrconf_sysctl_register(struct inet6_dev *idev) 4536 { 4537 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4538 &ndisc_ifinfo_sysctl_change); 4539 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4540 idev, &idev->cnf); 4541 } 4542 4543 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4544 { 4545 __addrconf_sysctl_unregister(&idev->cnf); 4546 neigh_sysctl_unregister(idev->nd_parms); 4547 } 4548 4549 4550 #endif 4551 4552 static int __net_init addrconf_init_net(struct net *net) 4553 { 4554 int err; 4555 struct ipv6_devconf *all, *dflt; 4556 4557 err = -ENOMEM; 4558 all = &ipv6_devconf; 4559 dflt = &ipv6_devconf_dflt; 4560 4561 if (!net_eq(net, &init_net)) { 4562 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4563 if (all == NULL) 4564 goto err_alloc_all; 4565 4566 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4567 if (dflt == NULL) 4568 goto err_alloc_dflt; 4569 } else { 4570 /* these will be inherited by all namespaces */ 4571 dflt->autoconf = ipv6_defaults.autoconf; 4572 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4573 } 4574 4575 net->ipv6.devconf_all = all; 4576 net->ipv6.devconf_dflt = dflt; 4577 4578 #ifdef CONFIG_SYSCTL 4579 err = __addrconf_sysctl_register(net, "all", NULL, all); 4580 if (err < 0) 4581 goto err_reg_all; 4582 4583 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4584 if (err < 0) 4585 goto err_reg_dflt; 4586 #endif 4587 return 0; 4588 4589 #ifdef CONFIG_SYSCTL 4590 err_reg_dflt: 4591 __addrconf_sysctl_unregister(all); 4592 err_reg_all: 4593 kfree(dflt); 4594 #endif 4595 err_alloc_dflt: 4596 kfree(all); 4597 err_alloc_all: 4598 return err; 4599 } 4600 4601 static void __net_exit addrconf_exit_net(struct net *net) 4602 { 4603 #ifdef CONFIG_SYSCTL 4604 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4605 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4606 #endif 4607 if (!net_eq(net, &init_net)) { 4608 kfree(net->ipv6.devconf_dflt); 4609 kfree(net->ipv6.devconf_all); 4610 } 4611 } 4612 4613 static struct pernet_operations addrconf_ops = { 4614 .init = addrconf_init_net, 4615 .exit = addrconf_exit_net, 4616 }; 4617 4618 /* 4619 * Device notifier 4620 */ 4621 4622 int register_inet6addr_notifier(struct notifier_block *nb) 4623 { 4624 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4625 } 4626 EXPORT_SYMBOL(register_inet6addr_notifier); 4627 4628 int unregister_inet6addr_notifier(struct notifier_block *nb) 4629 { 4630 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4631 } 4632 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4633 4634 static struct rtnl_af_ops inet6_ops = { 4635 .family = AF_INET6, 4636 .fill_link_af = inet6_fill_link_af, 4637 .get_link_af_size = inet6_get_link_af_size, 4638 }; 4639 4640 /* 4641 * Init / cleanup code 4642 */ 4643 4644 int __init addrconf_init(void) 4645 { 4646 int i, err; 4647 4648 err = ipv6_addr_label_init(); 4649 if (err < 0) { 4650 printk(KERN_CRIT "IPv6 Addrconf:" 4651 " cannot initialize default policy table: %d.\n", err); 4652 goto out; 4653 } 4654 4655 err = register_pernet_subsys(&addrconf_ops); 4656 if (err < 0) 4657 goto out_addrlabel; 4658 4659 /* The addrconf netdev notifier requires that loopback_dev 4660 * has it's ipv6 private information allocated and setup 4661 * before it can bring up and give link-local addresses 4662 * to other devices which are up. 4663 * 4664 * Unfortunately, loopback_dev is not necessarily the first 4665 * entry in the global dev_base list of net devices. In fact, 4666 * it is likely to be the very last entry on that list. 4667 * So this causes the notifier registry below to try and 4668 * give link-local addresses to all devices besides loopback_dev 4669 * first, then loopback_dev, which cases all the non-loopback_dev 4670 * devices to fail to get a link-local address. 4671 * 4672 * So, as a temporary fix, allocate the ipv6 structure for 4673 * loopback_dev first by hand. 4674 * Longer term, all of the dependencies ipv6 has upon the loopback 4675 * device and it being up should be removed. 4676 */ 4677 rtnl_lock(); 4678 if (!ipv6_add_dev(init_net.loopback_dev)) 4679 err = -ENOMEM; 4680 rtnl_unlock(); 4681 if (err) 4682 goto errlo; 4683 4684 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4685 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4686 4687 register_netdevice_notifier(&ipv6_dev_notf); 4688 4689 addrconf_verify(0); 4690 4691 err = rtnl_af_register(&inet6_ops); 4692 if (err < 0) 4693 goto errout_af; 4694 4695 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4696 if (err < 0) 4697 goto errout; 4698 4699 /* Only the first call to __rtnl_register can fail */ 4700 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4701 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4702 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4703 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4704 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4705 4706 ipv6_addr_label_rtnl_register(); 4707 4708 return 0; 4709 errout: 4710 rtnl_af_unregister(&inet6_ops); 4711 errout_af: 4712 unregister_netdevice_notifier(&ipv6_dev_notf); 4713 errlo: 4714 unregister_pernet_subsys(&addrconf_ops); 4715 out_addrlabel: 4716 ipv6_addr_label_cleanup(); 4717 out: 4718 return err; 4719 } 4720 4721 void addrconf_cleanup(void) 4722 { 4723 struct net_device *dev; 4724 int i; 4725 4726 unregister_netdevice_notifier(&ipv6_dev_notf); 4727 unregister_pernet_subsys(&addrconf_ops); 4728 ipv6_addr_label_cleanup(); 4729 4730 rtnl_lock(); 4731 4732 __rtnl_af_unregister(&inet6_ops); 4733 4734 /* clean dev list */ 4735 for_each_netdev(&init_net, dev) { 4736 if (__in6_dev_get(dev) == NULL) 4737 continue; 4738 addrconf_ifdown(dev, 1); 4739 } 4740 addrconf_ifdown(init_net.loopback_dev, 2); 4741 4742 /* 4743 * Check hash table. 4744 */ 4745 spin_lock_bh(&addrconf_hash_lock); 4746 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4747 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4748 spin_unlock_bh(&addrconf_hash_lock); 4749 4750 del_timer(&addr_chk_timer); 4751 rtnl_unlock(); 4752 } 4753