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 (dst_get_neighbour_raw(&rt->dst) == 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 if (ifp->prefix_len == 127) /* RFC 6164 */ 1474 return; 1475 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1476 if (ipv6_addr_any(&addr)) 1477 return; 1478 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1479 } 1480 1481 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1482 { 1483 struct in6_addr addr; 1484 if (ifp->prefix_len == 127) /* RFC 6164 */ 1485 return; 1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1487 if (ipv6_addr_any(&addr)) 1488 return; 1489 __ipv6_dev_ac_dec(ifp->idev, &addr); 1490 } 1491 1492 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1493 { 1494 if (dev->addr_len != ETH_ALEN) 1495 return -1; 1496 memcpy(eui, dev->dev_addr, 3); 1497 memcpy(eui + 5, dev->dev_addr + 3, 3); 1498 1499 /* 1500 * The zSeries OSA network cards can be shared among various 1501 * OS instances, but the OSA cards have only one MAC address. 1502 * This leads to duplicate address conflicts in conjunction 1503 * with IPv6 if more than one instance uses the same card. 1504 * 1505 * The driver for these cards can deliver a unique 16-bit 1506 * identifier for each instance sharing the same card. It is 1507 * placed instead of 0xFFFE in the interface identifier. The 1508 * "u" bit of the interface identifier is not inverted in this 1509 * case. Hence the resulting interface identifier has local 1510 * scope according to RFC2373. 1511 */ 1512 if (dev->dev_id) { 1513 eui[3] = (dev->dev_id >> 8) & 0xFF; 1514 eui[4] = dev->dev_id & 0xFF; 1515 } else { 1516 eui[3] = 0xFF; 1517 eui[4] = 0xFE; 1518 eui[0] ^= 2; 1519 } 1520 return 0; 1521 } 1522 1523 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1524 { 1525 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1526 if (dev->addr_len != ARCNET_ALEN) 1527 return -1; 1528 memset(eui, 0, 7); 1529 eui[7] = *(u8*)dev->dev_addr; 1530 return 0; 1531 } 1532 1533 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1534 { 1535 if (dev->addr_len != INFINIBAND_ALEN) 1536 return -1; 1537 memcpy(eui, dev->dev_addr + 12, 8); 1538 eui[0] |= 2; 1539 return 0; 1540 } 1541 1542 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1543 { 1544 if (addr == 0) 1545 return -1; 1546 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1547 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1548 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1549 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1550 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1551 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1552 eui[1] = 0; 1553 eui[2] = 0x5E; 1554 eui[3] = 0xFE; 1555 memcpy(eui + 4, &addr, 4); 1556 return 0; 1557 } 1558 1559 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1560 { 1561 if (dev->priv_flags & IFF_ISATAP) 1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1563 return -1; 1564 } 1565 1566 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1567 { 1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1569 } 1570 1571 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1572 { 1573 switch (dev->type) { 1574 case ARPHRD_ETHER: 1575 case ARPHRD_FDDI: 1576 case ARPHRD_IEEE802_TR: 1577 return addrconf_ifid_eui48(eui, dev); 1578 case ARPHRD_ARCNET: 1579 return addrconf_ifid_arcnet(eui, dev); 1580 case ARPHRD_INFINIBAND: 1581 return addrconf_ifid_infiniband(eui, dev); 1582 case ARPHRD_SIT: 1583 return addrconf_ifid_sit(eui, dev); 1584 case ARPHRD_IPGRE: 1585 return addrconf_ifid_gre(eui, dev); 1586 } 1587 return -1; 1588 } 1589 1590 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1591 { 1592 int err = -1; 1593 struct inet6_ifaddr *ifp; 1594 1595 read_lock_bh(&idev->lock); 1596 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1597 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1598 memcpy(eui, ifp->addr.s6_addr+8, 8); 1599 err = 0; 1600 break; 1601 } 1602 } 1603 read_unlock_bh(&idev->lock); 1604 return err; 1605 } 1606 1607 #ifdef CONFIG_IPV6_PRIVACY 1608 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1609 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1610 { 1611 regen: 1612 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1613 idev->rndid[0] &= ~0x02; 1614 1615 /* 1616 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1617 * check if generated address is not inappropriate 1618 * 1619 * - Reserved subnet anycast (RFC 2526) 1620 * 11111101 11....11 1xxxxxxx 1621 * - ISATAP (RFC4214) 6.1 1622 * 00-00-5E-FE-xx-xx-xx-xx 1623 * - value 0 1624 * - XXX: already assigned to an address on the device 1625 */ 1626 if (idev->rndid[0] == 0xfd && 1627 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1628 (idev->rndid[7]&0x80)) 1629 goto regen; 1630 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1631 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1632 goto regen; 1633 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1634 goto regen; 1635 } 1636 1637 return 0; 1638 } 1639 1640 static void ipv6_regen_rndid(unsigned long data) 1641 { 1642 struct inet6_dev *idev = (struct inet6_dev *) data; 1643 unsigned long expires; 1644 1645 rcu_read_lock_bh(); 1646 write_lock_bh(&idev->lock); 1647 1648 if (idev->dead) 1649 goto out; 1650 1651 if (__ipv6_regen_rndid(idev) < 0) 1652 goto out; 1653 1654 expires = jiffies + 1655 idev->cnf.temp_prefered_lft * HZ - 1656 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1657 idev->cnf.max_desync_factor * HZ; 1658 if (time_before(expires, jiffies)) { 1659 printk(KERN_WARNING 1660 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1661 idev->dev->name); 1662 goto out; 1663 } 1664 1665 if (!mod_timer(&idev->regen_timer, expires)) 1666 in6_dev_hold(idev); 1667 1668 out: 1669 write_unlock_bh(&idev->lock); 1670 rcu_read_unlock_bh(); 1671 in6_dev_put(idev); 1672 } 1673 1674 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1675 int ret = 0; 1676 1677 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1678 ret = __ipv6_regen_rndid(idev); 1679 return ret; 1680 } 1681 #endif 1682 1683 /* 1684 * Add prefix route. 1685 */ 1686 1687 static void 1688 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1689 unsigned long expires, u32 flags) 1690 { 1691 struct fib6_config cfg = { 1692 .fc_table = RT6_TABLE_PREFIX, 1693 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1694 .fc_ifindex = dev->ifindex, 1695 .fc_expires = expires, 1696 .fc_dst_len = plen, 1697 .fc_flags = RTF_UP | flags, 1698 .fc_nlinfo.nl_net = dev_net(dev), 1699 .fc_protocol = RTPROT_KERNEL, 1700 }; 1701 1702 ipv6_addr_copy(&cfg.fc_dst, pfx); 1703 1704 /* Prevent useless cloning on PtP SIT. 1705 This thing is done here expecting that the whole 1706 class of non-broadcast devices need not cloning. 1707 */ 1708 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1709 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1710 cfg.fc_flags |= RTF_NONEXTHOP; 1711 #endif 1712 1713 ip6_route_add(&cfg); 1714 } 1715 1716 /* Create "default" multicast route to the interface */ 1717 1718 static void addrconf_add_mroute(struct net_device *dev) 1719 { 1720 struct fib6_config cfg = { 1721 .fc_table = RT6_TABLE_LOCAL, 1722 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1723 .fc_ifindex = dev->ifindex, 1724 .fc_dst_len = 8, 1725 .fc_flags = RTF_UP, 1726 .fc_nlinfo.nl_net = dev_net(dev), 1727 }; 1728 1729 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1730 1731 ip6_route_add(&cfg); 1732 } 1733 1734 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1735 static void sit_route_add(struct net_device *dev) 1736 { 1737 struct fib6_config cfg = { 1738 .fc_table = RT6_TABLE_MAIN, 1739 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1740 .fc_ifindex = dev->ifindex, 1741 .fc_dst_len = 96, 1742 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1743 .fc_nlinfo.nl_net = dev_net(dev), 1744 }; 1745 1746 /* prefix length - 96 bits "::d.d.d.d" */ 1747 ip6_route_add(&cfg); 1748 } 1749 #endif 1750 1751 static void addrconf_add_lroute(struct net_device *dev) 1752 { 1753 struct in6_addr addr; 1754 1755 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1756 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1757 } 1758 1759 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1760 { 1761 struct inet6_dev *idev; 1762 1763 ASSERT_RTNL(); 1764 1765 idev = ipv6_find_idev(dev); 1766 if (!idev) 1767 return ERR_PTR(-ENOBUFS); 1768 1769 if (idev->cnf.disable_ipv6) 1770 return ERR_PTR(-EACCES); 1771 1772 /* Add default multicast route */ 1773 addrconf_add_mroute(dev); 1774 1775 /* Add link local route */ 1776 addrconf_add_lroute(dev); 1777 return idev; 1778 } 1779 1780 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1781 { 1782 struct prefix_info *pinfo; 1783 __u32 valid_lft; 1784 __u32 prefered_lft; 1785 int addr_type; 1786 struct inet6_dev *in6_dev; 1787 struct net *net = dev_net(dev); 1788 1789 pinfo = (struct prefix_info *) opt; 1790 1791 if (len < sizeof(struct prefix_info)) { 1792 ADBG(("addrconf: prefix option too short\n")); 1793 return; 1794 } 1795 1796 /* 1797 * Validation checks ([ADDRCONF], page 19) 1798 */ 1799 1800 addr_type = ipv6_addr_type(&pinfo->prefix); 1801 1802 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1803 return; 1804 1805 valid_lft = ntohl(pinfo->valid); 1806 prefered_lft = ntohl(pinfo->prefered); 1807 1808 if (prefered_lft > valid_lft) { 1809 if (net_ratelimit()) 1810 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1811 return; 1812 } 1813 1814 in6_dev = in6_dev_get(dev); 1815 1816 if (in6_dev == NULL) { 1817 if (net_ratelimit()) 1818 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1819 return; 1820 } 1821 1822 /* 1823 * Two things going on here: 1824 * 1) Add routes for on-link prefixes 1825 * 2) Configure prefixes with the auto flag set 1826 */ 1827 1828 if (pinfo->onlink) { 1829 struct rt6_info *rt; 1830 unsigned long rt_expires; 1831 1832 /* Avoid arithmetic overflow. Really, we could 1833 * save rt_expires in seconds, likely valid_lft, 1834 * but it would require division in fib gc, that it 1835 * not good. 1836 */ 1837 if (HZ > USER_HZ) 1838 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1839 else 1840 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1841 1842 if (addrconf_finite_timeout(rt_expires)) 1843 rt_expires *= HZ; 1844 1845 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1846 dev->ifindex, 1); 1847 1848 if (rt && addrconf_is_prefix_route(rt)) { 1849 /* Autoconf prefix route */ 1850 if (valid_lft == 0) { 1851 ip6_del_rt(rt); 1852 rt = NULL; 1853 } else if (addrconf_finite_timeout(rt_expires)) { 1854 /* not infinity */ 1855 rt->rt6i_expires = jiffies + rt_expires; 1856 rt->rt6i_flags |= RTF_EXPIRES; 1857 } else { 1858 rt->rt6i_flags &= ~RTF_EXPIRES; 1859 rt->rt6i_expires = 0; 1860 } 1861 } else if (valid_lft) { 1862 clock_t expires = 0; 1863 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1864 if (addrconf_finite_timeout(rt_expires)) { 1865 /* not infinity */ 1866 flags |= RTF_EXPIRES; 1867 expires = jiffies_to_clock_t(rt_expires); 1868 } 1869 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1870 dev, expires, flags); 1871 } 1872 if (rt) 1873 dst_release(&rt->dst); 1874 } 1875 1876 /* Try to figure out our local address for this prefix */ 1877 1878 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1879 struct inet6_ifaddr * ifp; 1880 struct in6_addr addr; 1881 int create = 0, update_lft = 0; 1882 1883 if (pinfo->prefix_len == 64) { 1884 memcpy(&addr, &pinfo->prefix, 8); 1885 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1886 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1887 in6_dev_put(in6_dev); 1888 return; 1889 } 1890 goto ok; 1891 } 1892 if (net_ratelimit()) 1893 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1894 pinfo->prefix_len); 1895 in6_dev_put(in6_dev); 1896 return; 1897 1898 ok: 1899 1900 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1901 1902 if (ifp == NULL && valid_lft) { 1903 int max_addresses = in6_dev->cnf.max_addresses; 1904 u32 addr_flags = 0; 1905 1906 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1907 if (in6_dev->cnf.optimistic_dad && 1908 !net->ipv6.devconf_all->forwarding) 1909 addr_flags = IFA_F_OPTIMISTIC; 1910 #endif 1911 1912 /* Do not allow to create too much of autoconfigured 1913 * addresses; this would be too easy way to crash kernel. 1914 */ 1915 if (!max_addresses || 1916 ipv6_count_addresses(in6_dev) < max_addresses) 1917 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1918 addr_type&IPV6_ADDR_SCOPE_MASK, 1919 addr_flags); 1920 1921 if (!ifp || IS_ERR(ifp)) { 1922 in6_dev_put(in6_dev); 1923 return; 1924 } 1925 1926 update_lft = create = 1; 1927 ifp->cstamp = jiffies; 1928 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1929 } 1930 1931 if (ifp) { 1932 int flags; 1933 unsigned long now; 1934 #ifdef CONFIG_IPV6_PRIVACY 1935 struct inet6_ifaddr *ift; 1936 #endif 1937 u32 stored_lft; 1938 1939 /* update lifetime (RFC2462 5.5.3 e) */ 1940 spin_lock(&ifp->lock); 1941 now = jiffies; 1942 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1943 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1944 else 1945 stored_lft = 0; 1946 if (!update_lft && stored_lft) { 1947 if (valid_lft > MIN_VALID_LIFETIME || 1948 valid_lft > stored_lft) 1949 update_lft = 1; 1950 else if (stored_lft <= MIN_VALID_LIFETIME) { 1951 /* valid_lft <= stored_lft is always true */ 1952 /* 1953 * RFC 4862 Section 5.5.3e: 1954 * "Note that the preferred lifetime of 1955 * the corresponding address is always 1956 * reset to the Preferred Lifetime in 1957 * the received Prefix Information 1958 * option, regardless of whether the 1959 * valid lifetime is also reset or 1960 * ignored." 1961 * 1962 * So if the preferred lifetime in 1963 * this advertisement is different 1964 * than what we have stored, but the 1965 * valid lifetime is invalid, just 1966 * reset prefered_lft. 1967 * 1968 * We must set the valid lifetime 1969 * to the stored lifetime since we'll 1970 * be updating the timestamp below, 1971 * else we'll set it back to the 1972 * minimum. 1973 */ 1974 if (prefered_lft != ifp->prefered_lft) { 1975 valid_lft = stored_lft; 1976 update_lft = 1; 1977 } 1978 } else { 1979 valid_lft = MIN_VALID_LIFETIME; 1980 if (valid_lft < prefered_lft) 1981 prefered_lft = valid_lft; 1982 update_lft = 1; 1983 } 1984 } 1985 1986 if (update_lft) { 1987 ifp->valid_lft = valid_lft; 1988 ifp->prefered_lft = prefered_lft; 1989 ifp->tstamp = now; 1990 flags = ifp->flags; 1991 ifp->flags &= ~IFA_F_DEPRECATED; 1992 spin_unlock(&ifp->lock); 1993 1994 if (!(flags&IFA_F_TENTATIVE)) 1995 ipv6_ifa_notify(0, ifp); 1996 } else 1997 spin_unlock(&ifp->lock); 1998 1999 #ifdef CONFIG_IPV6_PRIVACY 2000 read_lock_bh(&in6_dev->lock); 2001 /* update all temporary addresses in the list */ 2002 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) { 2003 /* 2004 * When adjusting the lifetimes of an existing 2005 * temporary address, only lower the lifetimes. 2006 * Implementations must not increase the 2007 * lifetimes of an existing temporary address 2008 * when processing a Prefix Information Option. 2009 */ 2010 if (ifp != ift->ifpub) 2011 continue; 2012 2013 spin_lock(&ift->lock); 2014 flags = ift->flags; 2015 if (ift->valid_lft > valid_lft && 2016 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 2017 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 2018 if (ift->prefered_lft > prefered_lft && 2019 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 2020 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 2021 spin_unlock(&ift->lock); 2022 if (!(flags&IFA_F_TENTATIVE)) 2023 ipv6_ifa_notify(0, ift); 2024 } 2025 2026 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2027 /* 2028 * When a new public address is created as described in [ADDRCONF], 2029 * also create a new temporary address. Also create a temporary 2030 * address if it's enabled but no temporary address currently exists. 2031 */ 2032 read_unlock_bh(&in6_dev->lock); 2033 ipv6_create_tempaddr(ifp, NULL); 2034 } else { 2035 read_unlock_bh(&in6_dev->lock); 2036 } 2037 #endif 2038 in6_ifa_put(ifp); 2039 addrconf_verify(0); 2040 } 2041 } 2042 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2043 in6_dev_put(in6_dev); 2044 } 2045 2046 /* 2047 * Set destination address. 2048 * Special case for SIT interfaces where we create a new "virtual" 2049 * device. 2050 */ 2051 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2052 { 2053 struct in6_ifreq ireq; 2054 struct net_device *dev; 2055 int err = -EINVAL; 2056 2057 rtnl_lock(); 2058 2059 err = -EFAULT; 2060 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2061 goto err_exit; 2062 2063 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2064 2065 err = -ENODEV; 2066 if (dev == NULL) 2067 goto err_exit; 2068 2069 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2070 if (dev->type == ARPHRD_SIT) { 2071 const struct net_device_ops *ops = dev->netdev_ops; 2072 struct ifreq ifr; 2073 struct ip_tunnel_parm p; 2074 2075 err = -EADDRNOTAVAIL; 2076 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2077 goto err_exit; 2078 2079 memset(&p, 0, sizeof(p)); 2080 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2081 p.iph.saddr = 0; 2082 p.iph.version = 4; 2083 p.iph.ihl = 5; 2084 p.iph.protocol = IPPROTO_IPV6; 2085 p.iph.ttl = 64; 2086 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2087 2088 if (ops->ndo_do_ioctl) { 2089 mm_segment_t oldfs = get_fs(); 2090 2091 set_fs(KERNEL_DS); 2092 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2093 set_fs(oldfs); 2094 } else 2095 err = -EOPNOTSUPP; 2096 2097 if (err == 0) { 2098 err = -ENOBUFS; 2099 dev = __dev_get_by_name(net, p.name); 2100 if (!dev) 2101 goto err_exit; 2102 err = dev_open(dev); 2103 } 2104 } 2105 #endif 2106 2107 err_exit: 2108 rtnl_unlock(); 2109 return err; 2110 } 2111 2112 /* 2113 * Manual configuration of address on an interface 2114 */ 2115 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2116 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2117 __u32 valid_lft) 2118 { 2119 struct inet6_ifaddr *ifp; 2120 struct inet6_dev *idev; 2121 struct net_device *dev; 2122 int scope; 2123 u32 flags; 2124 clock_t expires; 2125 unsigned long timeout; 2126 2127 ASSERT_RTNL(); 2128 2129 if (plen > 128) 2130 return -EINVAL; 2131 2132 /* check the lifetime */ 2133 if (!valid_lft || prefered_lft > valid_lft) 2134 return -EINVAL; 2135 2136 dev = __dev_get_by_index(net, ifindex); 2137 if (!dev) 2138 return -ENODEV; 2139 2140 idev = addrconf_add_dev(dev); 2141 if (IS_ERR(idev)) 2142 return PTR_ERR(idev); 2143 2144 scope = ipv6_addr_scope(pfx); 2145 2146 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2147 if (addrconf_finite_timeout(timeout)) { 2148 expires = jiffies_to_clock_t(timeout * HZ); 2149 valid_lft = timeout; 2150 flags = RTF_EXPIRES; 2151 } else { 2152 expires = 0; 2153 flags = 0; 2154 ifa_flags |= IFA_F_PERMANENT; 2155 } 2156 2157 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2158 if (addrconf_finite_timeout(timeout)) { 2159 if (timeout == 0) 2160 ifa_flags |= IFA_F_DEPRECATED; 2161 prefered_lft = timeout; 2162 } 2163 2164 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2165 2166 if (!IS_ERR(ifp)) { 2167 spin_lock_bh(&ifp->lock); 2168 ifp->valid_lft = valid_lft; 2169 ifp->prefered_lft = prefered_lft; 2170 ifp->tstamp = jiffies; 2171 spin_unlock_bh(&ifp->lock); 2172 2173 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2174 expires, flags); 2175 /* 2176 * Note that section 3.1 of RFC 4429 indicates 2177 * that the Optimistic flag should not be set for 2178 * manually configured addresses 2179 */ 2180 addrconf_dad_start(ifp, 0); 2181 in6_ifa_put(ifp); 2182 addrconf_verify(0); 2183 return 0; 2184 } 2185 2186 return PTR_ERR(ifp); 2187 } 2188 2189 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2190 unsigned int plen) 2191 { 2192 struct inet6_ifaddr *ifp; 2193 struct inet6_dev *idev; 2194 struct net_device *dev; 2195 2196 if (plen > 128) 2197 return -EINVAL; 2198 2199 dev = __dev_get_by_index(net, ifindex); 2200 if (!dev) 2201 return -ENODEV; 2202 2203 if ((idev = __in6_dev_get(dev)) == NULL) 2204 return -ENXIO; 2205 2206 read_lock_bh(&idev->lock); 2207 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2208 if (ifp->prefix_len == plen && 2209 ipv6_addr_equal(pfx, &ifp->addr)) { 2210 in6_ifa_hold(ifp); 2211 read_unlock_bh(&idev->lock); 2212 2213 ipv6_del_addr(ifp); 2214 2215 /* If the last address is deleted administratively, 2216 disable IPv6 on this interface. 2217 */ 2218 if (list_empty(&idev->addr_list)) 2219 addrconf_ifdown(idev->dev, 1); 2220 return 0; 2221 } 2222 } 2223 read_unlock_bh(&idev->lock); 2224 return -EADDRNOTAVAIL; 2225 } 2226 2227 2228 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2229 { 2230 struct in6_ifreq ireq; 2231 int err; 2232 2233 if (!capable(CAP_NET_ADMIN)) 2234 return -EPERM; 2235 2236 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2237 return -EFAULT; 2238 2239 rtnl_lock(); 2240 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2241 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2242 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2243 rtnl_unlock(); 2244 return err; 2245 } 2246 2247 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2248 { 2249 struct in6_ifreq ireq; 2250 int err; 2251 2252 if (!capable(CAP_NET_ADMIN)) 2253 return -EPERM; 2254 2255 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2256 return -EFAULT; 2257 2258 rtnl_lock(); 2259 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2260 ireq.ifr6_prefixlen); 2261 rtnl_unlock(); 2262 return err; 2263 } 2264 2265 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2266 int plen, int scope) 2267 { 2268 struct inet6_ifaddr *ifp; 2269 2270 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2271 if (!IS_ERR(ifp)) { 2272 spin_lock_bh(&ifp->lock); 2273 ifp->flags &= ~IFA_F_TENTATIVE; 2274 spin_unlock_bh(&ifp->lock); 2275 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2276 in6_ifa_put(ifp); 2277 } 2278 } 2279 2280 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2281 static void sit_add_v4_addrs(struct inet6_dev *idev) 2282 { 2283 struct in6_addr addr; 2284 struct net_device *dev; 2285 struct net *net = dev_net(idev->dev); 2286 int scope; 2287 2288 ASSERT_RTNL(); 2289 2290 memset(&addr, 0, sizeof(struct in6_addr)); 2291 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2292 2293 if (idev->dev->flags&IFF_POINTOPOINT) { 2294 addr.s6_addr32[0] = htonl(0xfe800000); 2295 scope = IFA_LINK; 2296 } else { 2297 scope = IPV6_ADDR_COMPATv4; 2298 } 2299 2300 if (addr.s6_addr32[3]) { 2301 add_addr(idev, &addr, 128, scope); 2302 return; 2303 } 2304 2305 for_each_netdev(net, dev) { 2306 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2307 if (in_dev && (dev->flags & IFF_UP)) { 2308 struct in_ifaddr * ifa; 2309 2310 int flag = scope; 2311 2312 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2313 int plen; 2314 2315 addr.s6_addr32[3] = ifa->ifa_local; 2316 2317 if (ifa->ifa_scope == RT_SCOPE_LINK) 2318 continue; 2319 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2320 if (idev->dev->flags&IFF_POINTOPOINT) 2321 continue; 2322 flag |= IFA_HOST; 2323 } 2324 if (idev->dev->flags&IFF_POINTOPOINT) 2325 plen = 64; 2326 else 2327 plen = 96; 2328 2329 add_addr(idev, &addr, plen, flag); 2330 } 2331 } 2332 } 2333 } 2334 #endif 2335 2336 static void init_loopback(struct net_device *dev) 2337 { 2338 struct inet6_dev *idev; 2339 2340 /* ::1 */ 2341 2342 ASSERT_RTNL(); 2343 2344 if ((idev = ipv6_find_idev(dev)) == NULL) { 2345 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2346 return; 2347 } 2348 2349 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2350 } 2351 2352 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2353 { 2354 struct inet6_ifaddr * ifp; 2355 u32 addr_flags = IFA_F_PERMANENT; 2356 2357 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2358 if (idev->cnf.optimistic_dad && 2359 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2360 addr_flags |= IFA_F_OPTIMISTIC; 2361 #endif 2362 2363 2364 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2365 if (!IS_ERR(ifp)) { 2366 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2367 addrconf_dad_start(ifp, 0); 2368 in6_ifa_put(ifp); 2369 } 2370 } 2371 2372 static void addrconf_dev_config(struct net_device *dev) 2373 { 2374 struct in6_addr addr; 2375 struct inet6_dev * idev; 2376 2377 ASSERT_RTNL(); 2378 2379 if ((dev->type != ARPHRD_ETHER) && 2380 (dev->type != ARPHRD_FDDI) && 2381 (dev->type != ARPHRD_IEEE802_TR) && 2382 (dev->type != ARPHRD_ARCNET) && 2383 (dev->type != ARPHRD_INFINIBAND)) { 2384 /* Alas, we support only Ethernet autoconfiguration. */ 2385 return; 2386 } 2387 2388 idev = addrconf_add_dev(dev); 2389 if (IS_ERR(idev)) 2390 return; 2391 2392 memset(&addr, 0, sizeof(struct in6_addr)); 2393 addr.s6_addr32[0] = htonl(0xFE800000); 2394 2395 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2396 addrconf_add_linklocal(idev, &addr); 2397 } 2398 2399 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2400 static void addrconf_sit_config(struct net_device *dev) 2401 { 2402 struct inet6_dev *idev; 2403 2404 ASSERT_RTNL(); 2405 2406 /* 2407 * Configure the tunnel with one of our IPv4 2408 * addresses... we should configure all of 2409 * our v4 addrs in the tunnel 2410 */ 2411 2412 if ((idev = ipv6_find_idev(dev)) == NULL) { 2413 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2414 return; 2415 } 2416 2417 if (dev->priv_flags & IFF_ISATAP) { 2418 struct in6_addr addr; 2419 2420 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2421 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2422 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2423 addrconf_add_linklocal(idev, &addr); 2424 return; 2425 } 2426 2427 sit_add_v4_addrs(idev); 2428 2429 if (dev->flags&IFF_POINTOPOINT) { 2430 addrconf_add_mroute(dev); 2431 addrconf_add_lroute(dev); 2432 } else 2433 sit_route_add(dev); 2434 } 2435 #endif 2436 2437 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2438 static void addrconf_gre_config(struct net_device *dev) 2439 { 2440 struct inet6_dev *idev; 2441 struct in6_addr addr; 2442 2443 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name); 2444 2445 ASSERT_RTNL(); 2446 2447 if ((idev = ipv6_find_idev(dev)) == NULL) { 2448 printk(KERN_DEBUG "init gre: add_dev failed\n"); 2449 return; 2450 } 2451 2452 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2453 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2454 2455 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2456 addrconf_add_linklocal(idev, &addr); 2457 } 2458 #endif 2459 2460 static inline int 2461 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2462 { 2463 struct in6_addr lladdr; 2464 2465 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2466 addrconf_add_linklocal(idev, &lladdr); 2467 return 0; 2468 } 2469 return -1; 2470 } 2471 2472 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2473 { 2474 struct net_device *link_dev; 2475 struct net *net = dev_net(idev->dev); 2476 2477 /* first try to inherit the link-local address from the link device */ 2478 if (idev->dev->iflink && 2479 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2480 if (!ipv6_inherit_linklocal(idev, link_dev)) 2481 return; 2482 } 2483 /* then try to inherit it from any device */ 2484 for_each_netdev(net, link_dev) { 2485 if (!ipv6_inherit_linklocal(idev, link_dev)) 2486 return; 2487 } 2488 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2489 } 2490 2491 /* 2492 * Autoconfigure tunnel with a link-local address so routing protocols, 2493 * DHCPv6, MLD etc. can be run over the virtual link 2494 */ 2495 2496 static void addrconf_ip6_tnl_config(struct net_device *dev) 2497 { 2498 struct inet6_dev *idev; 2499 2500 ASSERT_RTNL(); 2501 2502 idev = addrconf_add_dev(dev); 2503 if (IS_ERR(idev)) { 2504 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2505 return; 2506 } 2507 ip6_tnl_add_linklocal(idev); 2508 } 2509 2510 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2511 void * data) 2512 { 2513 struct net_device *dev = (struct net_device *) data; 2514 struct inet6_dev *idev = __in6_dev_get(dev); 2515 int run_pending = 0; 2516 int err; 2517 2518 switch (event) { 2519 case NETDEV_REGISTER: 2520 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2521 idev = ipv6_add_dev(dev); 2522 if (!idev) 2523 return notifier_from_errno(-ENOMEM); 2524 } 2525 break; 2526 2527 case NETDEV_UP: 2528 case NETDEV_CHANGE: 2529 if (dev->flags & IFF_SLAVE) 2530 break; 2531 2532 if (event == NETDEV_UP) { 2533 if (!addrconf_qdisc_ok(dev)) { 2534 /* device is not ready yet. */ 2535 printk(KERN_INFO 2536 "ADDRCONF(NETDEV_UP): %s: " 2537 "link is not ready\n", 2538 dev->name); 2539 break; 2540 } 2541 2542 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2543 idev = ipv6_add_dev(dev); 2544 2545 if (idev) { 2546 idev->if_flags |= IF_READY; 2547 run_pending = 1; 2548 } 2549 } else { 2550 if (!addrconf_qdisc_ok(dev)) { 2551 /* device is still not ready. */ 2552 break; 2553 } 2554 2555 if (idev) { 2556 if (idev->if_flags & IF_READY) 2557 /* device is already configured. */ 2558 break; 2559 idev->if_flags |= IF_READY; 2560 } 2561 2562 printk(KERN_INFO 2563 "ADDRCONF(NETDEV_CHANGE): %s: " 2564 "link becomes ready\n", 2565 dev->name); 2566 2567 run_pending = 1; 2568 } 2569 2570 switch (dev->type) { 2571 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2572 case ARPHRD_SIT: 2573 addrconf_sit_config(dev); 2574 break; 2575 #endif 2576 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2577 case ARPHRD_IPGRE: 2578 addrconf_gre_config(dev); 2579 break; 2580 #endif 2581 case ARPHRD_TUNNEL6: 2582 addrconf_ip6_tnl_config(dev); 2583 break; 2584 case ARPHRD_LOOPBACK: 2585 init_loopback(dev); 2586 break; 2587 2588 default: 2589 addrconf_dev_config(dev); 2590 break; 2591 } 2592 2593 if (idev) { 2594 if (run_pending) 2595 addrconf_dad_run(idev); 2596 2597 /* 2598 * If the MTU changed during the interface down, 2599 * when the interface up, the changed MTU must be 2600 * reflected in the idev as well as routers. 2601 */ 2602 if (idev->cnf.mtu6 != dev->mtu && 2603 dev->mtu >= IPV6_MIN_MTU) { 2604 rt6_mtu_change(dev, dev->mtu); 2605 idev->cnf.mtu6 = dev->mtu; 2606 } 2607 idev->tstamp = jiffies; 2608 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2609 2610 /* 2611 * If the changed mtu during down is lower than 2612 * IPV6_MIN_MTU stop IPv6 on this interface. 2613 */ 2614 if (dev->mtu < IPV6_MIN_MTU) 2615 addrconf_ifdown(dev, 1); 2616 } 2617 break; 2618 2619 case NETDEV_CHANGEMTU: 2620 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2621 rt6_mtu_change(dev, dev->mtu); 2622 idev->cnf.mtu6 = dev->mtu; 2623 break; 2624 } 2625 2626 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2627 idev = ipv6_add_dev(dev); 2628 if (idev) 2629 break; 2630 } 2631 2632 /* 2633 * MTU falled under IPV6_MIN_MTU. 2634 * Stop IPv6 on this interface. 2635 */ 2636 2637 case NETDEV_DOWN: 2638 case NETDEV_UNREGISTER: 2639 /* 2640 * Remove all addresses from this interface. 2641 */ 2642 addrconf_ifdown(dev, event != NETDEV_DOWN); 2643 break; 2644 2645 case NETDEV_CHANGENAME: 2646 if (idev) { 2647 snmp6_unregister_dev(idev); 2648 addrconf_sysctl_unregister(idev); 2649 addrconf_sysctl_register(idev); 2650 err = snmp6_register_dev(idev); 2651 if (err) 2652 return notifier_from_errno(err); 2653 } 2654 break; 2655 2656 case NETDEV_PRE_TYPE_CHANGE: 2657 case NETDEV_POST_TYPE_CHANGE: 2658 addrconf_type_change(dev, event); 2659 break; 2660 } 2661 2662 return NOTIFY_OK; 2663 } 2664 2665 /* 2666 * addrconf module should be notified of a device going up 2667 */ 2668 static struct notifier_block ipv6_dev_notf = { 2669 .notifier_call = addrconf_notify, 2670 }; 2671 2672 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2673 { 2674 struct inet6_dev *idev; 2675 ASSERT_RTNL(); 2676 2677 idev = __in6_dev_get(dev); 2678 2679 if (event == NETDEV_POST_TYPE_CHANGE) 2680 ipv6_mc_remap(idev); 2681 else if (event == NETDEV_PRE_TYPE_CHANGE) 2682 ipv6_mc_unmap(idev); 2683 } 2684 2685 static int addrconf_ifdown(struct net_device *dev, int how) 2686 { 2687 struct net *net = dev_net(dev); 2688 struct inet6_dev *idev; 2689 struct inet6_ifaddr *ifa; 2690 int state, i; 2691 2692 ASSERT_RTNL(); 2693 2694 rt6_ifdown(net, dev); 2695 neigh_ifdown(&nd_tbl, dev); 2696 2697 idev = __in6_dev_get(dev); 2698 if (idev == NULL) 2699 return -ENODEV; 2700 2701 /* 2702 * Step 1: remove reference to ipv6 device from parent device. 2703 * Do not dev_put! 2704 */ 2705 if (how) { 2706 idev->dead = 1; 2707 2708 /* protected by rtnl_lock */ 2709 rcu_assign_pointer(dev->ip6_ptr, NULL); 2710 2711 /* Step 1.5: remove snmp6 entry */ 2712 snmp6_unregister_dev(idev); 2713 2714 } 2715 2716 /* Step 2: clear hash table */ 2717 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2718 struct hlist_head *h = &inet6_addr_lst[i]; 2719 struct hlist_node *n; 2720 2721 spin_lock_bh(&addrconf_hash_lock); 2722 restart: 2723 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2724 if (ifa->idev == idev) { 2725 hlist_del_init_rcu(&ifa->addr_lst); 2726 addrconf_del_timer(ifa); 2727 goto restart; 2728 } 2729 } 2730 spin_unlock_bh(&addrconf_hash_lock); 2731 } 2732 2733 write_lock_bh(&idev->lock); 2734 2735 /* Step 2: clear flags for stateless addrconf */ 2736 if (!how) 2737 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2738 2739 #ifdef CONFIG_IPV6_PRIVACY 2740 if (how && del_timer(&idev->regen_timer)) 2741 in6_dev_put(idev); 2742 2743 /* Step 3: clear tempaddr list */ 2744 while (!list_empty(&idev->tempaddr_list)) { 2745 ifa = list_first_entry(&idev->tempaddr_list, 2746 struct inet6_ifaddr, tmp_list); 2747 list_del(&ifa->tmp_list); 2748 write_unlock_bh(&idev->lock); 2749 spin_lock_bh(&ifa->lock); 2750 2751 if (ifa->ifpub) { 2752 in6_ifa_put(ifa->ifpub); 2753 ifa->ifpub = NULL; 2754 } 2755 spin_unlock_bh(&ifa->lock); 2756 in6_ifa_put(ifa); 2757 write_lock_bh(&idev->lock); 2758 } 2759 #endif 2760 2761 while (!list_empty(&idev->addr_list)) { 2762 ifa = list_first_entry(&idev->addr_list, 2763 struct inet6_ifaddr, if_list); 2764 addrconf_del_timer(ifa); 2765 2766 list_del(&ifa->if_list); 2767 2768 write_unlock_bh(&idev->lock); 2769 2770 spin_lock_bh(&ifa->state_lock); 2771 state = ifa->state; 2772 ifa->state = INET6_IFADDR_STATE_DEAD; 2773 spin_unlock_bh(&ifa->state_lock); 2774 2775 if (state != INET6_IFADDR_STATE_DEAD) { 2776 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2777 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2778 } 2779 in6_ifa_put(ifa); 2780 2781 write_lock_bh(&idev->lock); 2782 } 2783 2784 write_unlock_bh(&idev->lock); 2785 2786 /* Step 5: Discard multicast list */ 2787 if (how) 2788 ipv6_mc_destroy_dev(idev); 2789 else 2790 ipv6_mc_down(idev); 2791 2792 idev->tstamp = jiffies; 2793 2794 /* Last: Shot the device (if unregistered) */ 2795 if (how) { 2796 addrconf_sysctl_unregister(idev); 2797 neigh_parms_release(&nd_tbl, idev->nd_parms); 2798 neigh_ifdown(&nd_tbl, dev); 2799 in6_dev_put(idev); 2800 } 2801 return 0; 2802 } 2803 2804 static void addrconf_rs_timer(unsigned long data) 2805 { 2806 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2807 struct inet6_dev *idev = ifp->idev; 2808 2809 read_lock(&idev->lock); 2810 if (idev->dead || !(idev->if_flags & IF_READY)) 2811 goto out; 2812 2813 if (idev->cnf.forwarding) 2814 goto out; 2815 2816 /* Announcement received after solicitation was sent */ 2817 if (idev->if_flags & IF_RA_RCVD) 2818 goto out; 2819 2820 spin_lock(&ifp->lock); 2821 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2822 /* The wait after the last probe can be shorter */ 2823 addrconf_mod_timer(ifp, AC_RS, 2824 (ifp->probes == idev->cnf.rtr_solicits) ? 2825 idev->cnf.rtr_solicit_delay : 2826 idev->cnf.rtr_solicit_interval); 2827 spin_unlock(&ifp->lock); 2828 2829 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2830 } else { 2831 spin_unlock(&ifp->lock); 2832 /* 2833 * Note: we do not support deprecated "all on-link" 2834 * assumption any longer. 2835 */ 2836 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2837 idev->dev->name); 2838 } 2839 2840 out: 2841 read_unlock(&idev->lock); 2842 in6_ifa_put(ifp); 2843 } 2844 2845 /* 2846 * Duplicate Address Detection 2847 */ 2848 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2849 { 2850 unsigned long rand_num; 2851 struct inet6_dev *idev = ifp->idev; 2852 2853 if (ifp->flags & IFA_F_OPTIMISTIC) 2854 rand_num = 0; 2855 else 2856 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2857 2858 ifp->probes = idev->cnf.dad_transmits; 2859 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2860 } 2861 2862 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2863 { 2864 struct inet6_dev *idev = ifp->idev; 2865 struct net_device *dev = idev->dev; 2866 2867 addrconf_join_solict(dev, &ifp->addr); 2868 2869 net_srandom(ifp->addr.s6_addr32[3]); 2870 2871 read_lock_bh(&idev->lock); 2872 spin_lock(&ifp->lock); 2873 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2874 goto out; 2875 2876 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2877 idev->cnf.accept_dad < 1 || 2878 !(ifp->flags&IFA_F_TENTATIVE) || 2879 ifp->flags & IFA_F_NODAD) { 2880 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2881 spin_unlock(&ifp->lock); 2882 read_unlock_bh(&idev->lock); 2883 2884 addrconf_dad_completed(ifp); 2885 return; 2886 } 2887 2888 if (!(idev->if_flags & IF_READY)) { 2889 spin_unlock(&ifp->lock); 2890 read_unlock_bh(&idev->lock); 2891 /* 2892 * If the device is not ready: 2893 * - keep it tentative if it is a permanent address. 2894 * - otherwise, kill it. 2895 */ 2896 in6_ifa_hold(ifp); 2897 addrconf_dad_stop(ifp, 0); 2898 return; 2899 } 2900 2901 /* 2902 * Optimistic nodes can start receiving 2903 * Frames right away 2904 */ 2905 if (ifp->flags & IFA_F_OPTIMISTIC) 2906 ip6_ins_rt(ifp->rt); 2907 2908 addrconf_dad_kick(ifp); 2909 out: 2910 spin_unlock(&ifp->lock); 2911 read_unlock_bh(&idev->lock); 2912 } 2913 2914 static void addrconf_dad_timer(unsigned long data) 2915 { 2916 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2917 struct inet6_dev *idev = ifp->idev; 2918 struct in6_addr mcaddr; 2919 2920 if (!ifp->probes && addrconf_dad_end(ifp)) 2921 goto out; 2922 2923 read_lock(&idev->lock); 2924 if (idev->dead || !(idev->if_flags & IF_READY)) { 2925 read_unlock(&idev->lock); 2926 goto out; 2927 } 2928 2929 spin_lock(&ifp->lock); 2930 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2931 spin_unlock(&ifp->lock); 2932 read_unlock(&idev->lock); 2933 goto out; 2934 } 2935 2936 if (ifp->probes == 0) { 2937 /* 2938 * DAD was successful 2939 */ 2940 2941 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2942 spin_unlock(&ifp->lock); 2943 read_unlock(&idev->lock); 2944 2945 addrconf_dad_completed(ifp); 2946 2947 goto out; 2948 } 2949 2950 ifp->probes--; 2951 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2952 spin_unlock(&ifp->lock); 2953 read_unlock(&idev->lock); 2954 2955 /* send a neighbour solicitation for our addr */ 2956 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2957 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2958 out: 2959 in6_ifa_put(ifp); 2960 } 2961 2962 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2963 { 2964 struct net_device *dev = ifp->idev->dev; 2965 2966 /* 2967 * Configure the address for reception. Now it is valid. 2968 */ 2969 2970 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2971 2972 /* If added prefix is link local and forwarding is off, 2973 start sending router solicitations. 2974 */ 2975 2976 if ((ifp->idev->cnf.forwarding == 0 || 2977 ifp->idev->cnf.forwarding == 2) && 2978 ifp->idev->cnf.rtr_solicits > 0 && 2979 (dev->flags&IFF_LOOPBACK) == 0 && 2980 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2981 /* 2982 * If a host as already performed a random delay 2983 * [...] as part of DAD [...] there is no need 2984 * to delay again before sending the first RS 2985 */ 2986 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2987 2988 spin_lock_bh(&ifp->lock); 2989 ifp->probes = 1; 2990 ifp->idev->if_flags |= IF_RS_SENT; 2991 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2992 spin_unlock_bh(&ifp->lock); 2993 } 2994 } 2995 2996 static void addrconf_dad_run(struct inet6_dev *idev) 2997 { 2998 struct inet6_ifaddr *ifp; 2999 3000 read_lock_bh(&idev->lock); 3001 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3002 spin_lock(&ifp->lock); 3003 if (ifp->flags & IFA_F_TENTATIVE && 3004 ifp->state == INET6_IFADDR_STATE_DAD) 3005 addrconf_dad_kick(ifp); 3006 spin_unlock(&ifp->lock); 3007 } 3008 read_unlock_bh(&idev->lock); 3009 } 3010 3011 #ifdef CONFIG_PROC_FS 3012 struct if6_iter_state { 3013 struct seq_net_private p; 3014 int bucket; 3015 }; 3016 3017 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 3018 { 3019 struct inet6_ifaddr *ifa = NULL; 3020 struct if6_iter_state *state = seq->private; 3021 struct net *net = seq_file_net(seq); 3022 3023 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3024 struct hlist_node *n; 3025 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3026 addr_lst) 3027 if (net_eq(dev_net(ifa->idev->dev), net)) 3028 return ifa; 3029 } 3030 return NULL; 3031 } 3032 3033 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3034 struct inet6_ifaddr *ifa) 3035 { 3036 struct if6_iter_state *state = seq->private; 3037 struct net *net = seq_file_net(seq); 3038 struct hlist_node *n = &ifa->addr_lst; 3039 3040 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) 3041 if (net_eq(dev_net(ifa->idev->dev), net)) 3042 return ifa; 3043 3044 while (++state->bucket < IN6_ADDR_HSIZE) { 3045 hlist_for_each_entry_rcu_bh(ifa, n, 3046 &inet6_addr_lst[state->bucket], addr_lst) { 3047 if (net_eq(dev_net(ifa->idev->dev), net)) 3048 return ifa; 3049 } 3050 } 3051 3052 return NULL; 3053 } 3054 3055 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3056 { 3057 struct inet6_ifaddr *ifa = if6_get_first(seq); 3058 3059 if (ifa) 3060 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3061 --pos; 3062 return pos ? NULL : ifa; 3063 } 3064 3065 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3066 __acquires(rcu_bh) 3067 { 3068 rcu_read_lock_bh(); 3069 return if6_get_idx(seq, *pos); 3070 } 3071 3072 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3073 { 3074 struct inet6_ifaddr *ifa; 3075 3076 ifa = if6_get_next(seq, v); 3077 ++*pos; 3078 return ifa; 3079 } 3080 3081 static void if6_seq_stop(struct seq_file *seq, void *v) 3082 __releases(rcu_bh) 3083 { 3084 rcu_read_unlock_bh(); 3085 } 3086 3087 static int if6_seq_show(struct seq_file *seq, void *v) 3088 { 3089 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3090 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3091 &ifp->addr, 3092 ifp->idev->dev->ifindex, 3093 ifp->prefix_len, 3094 ifp->scope, 3095 ifp->flags, 3096 ifp->idev->dev->name); 3097 return 0; 3098 } 3099 3100 static const struct seq_operations if6_seq_ops = { 3101 .start = if6_seq_start, 3102 .next = if6_seq_next, 3103 .show = if6_seq_show, 3104 .stop = if6_seq_stop, 3105 }; 3106 3107 static int if6_seq_open(struct inode *inode, struct file *file) 3108 { 3109 return seq_open_net(inode, file, &if6_seq_ops, 3110 sizeof(struct if6_iter_state)); 3111 } 3112 3113 static const struct file_operations if6_fops = { 3114 .owner = THIS_MODULE, 3115 .open = if6_seq_open, 3116 .read = seq_read, 3117 .llseek = seq_lseek, 3118 .release = seq_release_net, 3119 }; 3120 3121 static int __net_init if6_proc_net_init(struct net *net) 3122 { 3123 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3124 return -ENOMEM; 3125 return 0; 3126 } 3127 3128 static void __net_exit if6_proc_net_exit(struct net *net) 3129 { 3130 proc_net_remove(net, "if_inet6"); 3131 } 3132 3133 static struct pernet_operations if6_proc_net_ops = { 3134 .init = if6_proc_net_init, 3135 .exit = if6_proc_net_exit, 3136 }; 3137 3138 int __init if6_proc_init(void) 3139 { 3140 return register_pernet_subsys(&if6_proc_net_ops); 3141 } 3142 3143 void if6_proc_exit(void) 3144 { 3145 unregister_pernet_subsys(&if6_proc_net_ops); 3146 } 3147 #endif /* CONFIG_PROC_FS */ 3148 3149 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3150 /* Check if address is a home address configured on any interface. */ 3151 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3152 { 3153 int ret = 0; 3154 struct inet6_ifaddr *ifp = NULL; 3155 struct hlist_node *n; 3156 unsigned int hash = ipv6_addr_hash(addr); 3157 3158 rcu_read_lock_bh(); 3159 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3160 if (!net_eq(dev_net(ifp->idev->dev), net)) 3161 continue; 3162 if (ipv6_addr_equal(&ifp->addr, addr) && 3163 (ifp->flags & IFA_F_HOMEADDRESS)) { 3164 ret = 1; 3165 break; 3166 } 3167 } 3168 rcu_read_unlock_bh(); 3169 return ret; 3170 } 3171 #endif 3172 3173 /* 3174 * Periodic address status verification 3175 */ 3176 3177 static void addrconf_verify(unsigned long foo) 3178 { 3179 unsigned long now, next, next_sec, next_sched; 3180 struct inet6_ifaddr *ifp; 3181 struct hlist_node *node; 3182 int i; 3183 3184 rcu_read_lock_bh(); 3185 spin_lock(&addrconf_verify_lock); 3186 now = jiffies; 3187 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3188 3189 del_timer(&addr_chk_timer); 3190 3191 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3192 restart: 3193 hlist_for_each_entry_rcu_bh(ifp, node, 3194 &inet6_addr_lst[i], addr_lst) { 3195 unsigned long age; 3196 3197 if (ifp->flags & IFA_F_PERMANENT) 3198 continue; 3199 3200 spin_lock(&ifp->lock); 3201 /* We try to batch several events at once. */ 3202 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3203 3204 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3205 age >= ifp->valid_lft) { 3206 spin_unlock(&ifp->lock); 3207 in6_ifa_hold(ifp); 3208 ipv6_del_addr(ifp); 3209 goto restart; 3210 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3211 spin_unlock(&ifp->lock); 3212 continue; 3213 } else if (age >= ifp->prefered_lft) { 3214 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3215 int deprecate = 0; 3216 3217 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3218 deprecate = 1; 3219 ifp->flags |= IFA_F_DEPRECATED; 3220 } 3221 3222 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3223 next = ifp->tstamp + ifp->valid_lft * HZ; 3224 3225 spin_unlock(&ifp->lock); 3226 3227 if (deprecate) { 3228 in6_ifa_hold(ifp); 3229 3230 ipv6_ifa_notify(0, ifp); 3231 in6_ifa_put(ifp); 3232 goto restart; 3233 } 3234 #ifdef CONFIG_IPV6_PRIVACY 3235 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3236 !(ifp->flags&IFA_F_TENTATIVE)) { 3237 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3238 ifp->idev->cnf.dad_transmits * 3239 ifp->idev->nd_parms->retrans_time / HZ; 3240 3241 if (age >= ifp->prefered_lft - regen_advance) { 3242 struct inet6_ifaddr *ifpub = ifp->ifpub; 3243 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3244 next = ifp->tstamp + ifp->prefered_lft * HZ; 3245 if (!ifp->regen_count && ifpub) { 3246 ifp->regen_count++; 3247 in6_ifa_hold(ifp); 3248 in6_ifa_hold(ifpub); 3249 spin_unlock(&ifp->lock); 3250 3251 spin_lock(&ifpub->lock); 3252 ifpub->regen_count = 0; 3253 spin_unlock(&ifpub->lock); 3254 ipv6_create_tempaddr(ifpub, ifp); 3255 in6_ifa_put(ifpub); 3256 in6_ifa_put(ifp); 3257 goto restart; 3258 } 3259 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3260 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3261 spin_unlock(&ifp->lock); 3262 #endif 3263 } else { 3264 /* ifp->prefered_lft <= ifp->valid_lft */ 3265 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3266 next = ifp->tstamp + ifp->prefered_lft * HZ; 3267 spin_unlock(&ifp->lock); 3268 } 3269 } 3270 } 3271 3272 next_sec = round_jiffies_up(next); 3273 next_sched = next; 3274 3275 /* If rounded timeout is accurate enough, accept it. */ 3276 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3277 next_sched = next_sec; 3278 3279 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3280 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3281 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3282 3283 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3284 now, next, next_sec, next_sched)); 3285 3286 addr_chk_timer.expires = next_sched; 3287 add_timer(&addr_chk_timer); 3288 spin_unlock(&addrconf_verify_lock); 3289 rcu_read_unlock_bh(); 3290 } 3291 3292 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3293 { 3294 struct in6_addr *pfx = NULL; 3295 3296 if (addr) 3297 pfx = nla_data(addr); 3298 3299 if (local) { 3300 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3301 pfx = NULL; 3302 else 3303 pfx = nla_data(local); 3304 } 3305 3306 return pfx; 3307 } 3308 3309 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3310 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3311 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3312 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3313 }; 3314 3315 static int 3316 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3317 { 3318 struct net *net = sock_net(skb->sk); 3319 struct ifaddrmsg *ifm; 3320 struct nlattr *tb[IFA_MAX+1]; 3321 struct in6_addr *pfx; 3322 int err; 3323 3324 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3325 if (err < 0) 3326 return err; 3327 3328 ifm = nlmsg_data(nlh); 3329 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3330 if (pfx == NULL) 3331 return -EINVAL; 3332 3333 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3334 } 3335 3336 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3337 u32 prefered_lft, u32 valid_lft) 3338 { 3339 u32 flags; 3340 clock_t expires; 3341 unsigned long timeout; 3342 3343 if (!valid_lft || (prefered_lft > valid_lft)) 3344 return -EINVAL; 3345 3346 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3347 if (addrconf_finite_timeout(timeout)) { 3348 expires = jiffies_to_clock_t(timeout * HZ); 3349 valid_lft = timeout; 3350 flags = RTF_EXPIRES; 3351 } else { 3352 expires = 0; 3353 flags = 0; 3354 ifa_flags |= IFA_F_PERMANENT; 3355 } 3356 3357 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3358 if (addrconf_finite_timeout(timeout)) { 3359 if (timeout == 0) 3360 ifa_flags |= IFA_F_DEPRECATED; 3361 prefered_lft = timeout; 3362 } 3363 3364 spin_lock_bh(&ifp->lock); 3365 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3366 ifp->tstamp = jiffies; 3367 ifp->valid_lft = valid_lft; 3368 ifp->prefered_lft = prefered_lft; 3369 3370 spin_unlock_bh(&ifp->lock); 3371 if (!(ifp->flags&IFA_F_TENTATIVE)) 3372 ipv6_ifa_notify(0, ifp); 3373 3374 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3375 expires, flags); 3376 addrconf_verify(0); 3377 3378 return 0; 3379 } 3380 3381 static int 3382 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3383 { 3384 struct net *net = sock_net(skb->sk); 3385 struct ifaddrmsg *ifm; 3386 struct nlattr *tb[IFA_MAX+1]; 3387 struct in6_addr *pfx; 3388 struct inet6_ifaddr *ifa; 3389 struct net_device *dev; 3390 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3391 u8 ifa_flags; 3392 int err; 3393 3394 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3395 if (err < 0) 3396 return err; 3397 3398 ifm = nlmsg_data(nlh); 3399 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3400 if (pfx == NULL) 3401 return -EINVAL; 3402 3403 if (tb[IFA_CACHEINFO]) { 3404 struct ifa_cacheinfo *ci; 3405 3406 ci = nla_data(tb[IFA_CACHEINFO]); 3407 valid_lft = ci->ifa_valid; 3408 preferred_lft = ci->ifa_prefered; 3409 } else { 3410 preferred_lft = INFINITY_LIFE_TIME; 3411 valid_lft = INFINITY_LIFE_TIME; 3412 } 3413 3414 dev = __dev_get_by_index(net, ifm->ifa_index); 3415 if (dev == NULL) 3416 return -ENODEV; 3417 3418 /* We ignore other flags so far. */ 3419 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3420 3421 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3422 if (ifa == NULL) { 3423 /* 3424 * It would be best to check for !NLM_F_CREATE here but 3425 * userspace alreay relies on not having to provide this. 3426 */ 3427 return inet6_addr_add(net, ifm->ifa_index, pfx, 3428 ifm->ifa_prefixlen, ifa_flags, 3429 preferred_lft, valid_lft); 3430 } 3431 3432 if (nlh->nlmsg_flags & NLM_F_EXCL || 3433 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3434 err = -EEXIST; 3435 else 3436 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3437 3438 in6_ifa_put(ifa); 3439 3440 return err; 3441 } 3442 3443 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3444 u8 scope, int ifindex) 3445 { 3446 struct ifaddrmsg *ifm; 3447 3448 ifm = nlmsg_data(nlh); 3449 ifm->ifa_family = AF_INET6; 3450 ifm->ifa_prefixlen = prefixlen; 3451 ifm->ifa_flags = flags; 3452 ifm->ifa_scope = scope; 3453 ifm->ifa_index = ifindex; 3454 } 3455 3456 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3457 unsigned long tstamp, u32 preferred, u32 valid) 3458 { 3459 struct ifa_cacheinfo ci; 3460 3461 ci.cstamp = cstamp_delta(cstamp); 3462 ci.tstamp = cstamp_delta(tstamp); 3463 ci.ifa_prefered = preferred; 3464 ci.ifa_valid = valid; 3465 3466 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3467 } 3468 3469 static inline int rt_scope(int ifa_scope) 3470 { 3471 if (ifa_scope & IFA_HOST) 3472 return RT_SCOPE_HOST; 3473 else if (ifa_scope & IFA_LINK) 3474 return RT_SCOPE_LINK; 3475 else if (ifa_scope & IFA_SITE) 3476 return RT_SCOPE_SITE; 3477 else 3478 return RT_SCOPE_UNIVERSE; 3479 } 3480 3481 static inline int inet6_ifaddr_msgsize(void) 3482 { 3483 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3484 + nla_total_size(16) /* IFA_ADDRESS */ 3485 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3486 } 3487 3488 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3489 u32 pid, u32 seq, int event, unsigned int flags) 3490 { 3491 struct nlmsghdr *nlh; 3492 u32 preferred, valid; 3493 3494 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3495 if (nlh == NULL) 3496 return -EMSGSIZE; 3497 3498 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3499 ifa->idev->dev->ifindex); 3500 3501 if (!(ifa->flags&IFA_F_PERMANENT)) { 3502 preferred = ifa->prefered_lft; 3503 valid = ifa->valid_lft; 3504 if (preferred != INFINITY_LIFE_TIME) { 3505 long tval = (jiffies - ifa->tstamp)/HZ; 3506 if (preferred > tval) 3507 preferred -= tval; 3508 else 3509 preferred = 0; 3510 if (valid != INFINITY_LIFE_TIME) { 3511 if (valid > tval) 3512 valid -= tval; 3513 else 3514 valid = 0; 3515 } 3516 } 3517 } else { 3518 preferred = INFINITY_LIFE_TIME; 3519 valid = INFINITY_LIFE_TIME; 3520 } 3521 3522 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3523 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3524 nlmsg_cancel(skb, nlh); 3525 return -EMSGSIZE; 3526 } 3527 3528 return nlmsg_end(skb, nlh); 3529 } 3530 3531 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3532 u32 pid, u32 seq, int event, u16 flags) 3533 { 3534 struct nlmsghdr *nlh; 3535 u8 scope = RT_SCOPE_UNIVERSE; 3536 int ifindex = ifmca->idev->dev->ifindex; 3537 3538 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3539 scope = RT_SCOPE_SITE; 3540 3541 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3542 if (nlh == NULL) 3543 return -EMSGSIZE; 3544 3545 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3546 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3547 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3548 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3549 nlmsg_cancel(skb, nlh); 3550 return -EMSGSIZE; 3551 } 3552 3553 return nlmsg_end(skb, nlh); 3554 } 3555 3556 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3557 u32 pid, u32 seq, int event, unsigned int flags) 3558 { 3559 struct nlmsghdr *nlh; 3560 u8 scope = RT_SCOPE_UNIVERSE; 3561 int ifindex = ifaca->aca_idev->dev->ifindex; 3562 3563 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3564 scope = RT_SCOPE_SITE; 3565 3566 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3567 if (nlh == NULL) 3568 return -EMSGSIZE; 3569 3570 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3571 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3572 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3573 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3574 nlmsg_cancel(skb, nlh); 3575 return -EMSGSIZE; 3576 } 3577 3578 return nlmsg_end(skb, nlh); 3579 } 3580 3581 enum addr_type_t { 3582 UNICAST_ADDR, 3583 MULTICAST_ADDR, 3584 ANYCAST_ADDR, 3585 }; 3586 3587 /* called with rcu_read_lock() */ 3588 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3589 struct netlink_callback *cb, enum addr_type_t type, 3590 int s_ip_idx, int *p_ip_idx) 3591 { 3592 struct ifmcaddr6 *ifmca; 3593 struct ifacaddr6 *ifaca; 3594 int err = 1; 3595 int ip_idx = *p_ip_idx; 3596 3597 read_lock_bh(&idev->lock); 3598 switch (type) { 3599 case UNICAST_ADDR: { 3600 struct inet6_ifaddr *ifa; 3601 3602 /* unicast address incl. temp addr */ 3603 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3604 if (++ip_idx < s_ip_idx) 3605 continue; 3606 err = inet6_fill_ifaddr(skb, ifa, 3607 NETLINK_CB(cb->skb).pid, 3608 cb->nlh->nlmsg_seq, 3609 RTM_NEWADDR, 3610 NLM_F_MULTI); 3611 if (err <= 0) 3612 break; 3613 } 3614 break; 3615 } 3616 case MULTICAST_ADDR: 3617 /* multicast address */ 3618 for (ifmca = idev->mc_list; ifmca; 3619 ifmca = ifmca->next, ip_idx++) { 3620 if (ip_idx < s_ip_idx) 3621 continue; 3622 err = inet6_fill_ifmcaddr(skb, ifmca, 3623 NETLINK_CB(cb->skb).pid, 3624 cb->nlh->nlmsg_seq, 3625 RTM_GETMULTICAST, 3626 NLM_F_MULTI); 3627 if (err <= 0) 3628 break; 3629 } 3630 break; 3631 case ANYCAST_ADDR: 3632 /* anycast address */ 3633 for (ifaca = idev->ac_list; ifaca; 3634 ifaca = ifaca->aca_next, ip_idx++) { 3635 if (ip_idx < s_ip_idx) 3636 continue; 3637 err = inet6_fill_ifacaddr(skb, ifaca, 3638 NETLINK_CB(cb->skb).pid, 3639 cb->nlh->nlmsg_seq, 3640 RTM_GETANYCAST, 3641 NLM_F_MULTI); 3642 if (err <= 0) 3643 break; 3644 } 3645 break; 3646 default: 3647 break; 3648 } 3649 read_unlock_bh(&idev->lock); 3650 *p_ip_idx = ip_idx; 3651 return err; 3652 } 3653 3654 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3655 enum addr_type_t type) 3656 { 3657 struct net *net = sock_net(skb->sk); 3658 int h, s_h; 3659 int idx, ip_idx; 3660 int s_idx, s_ip_idx; 3661 struct net_device *dev; 3662 struct inet6_dev *idev; 3663 struct hlist_head *head; 3664 struct hlist_node *node; 3665 3666 s_h = cb->args[0]; 3667 s_idx = idx = cb->args[1]; 3668 s_ip_idx = ip_idx = cb->args[2]; 3669 3670 rcu_read_lock(); 3671 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3672 idx = 0; 3673 head = &net->dev_index_head[h]; 3674 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3675 if (idx < s_idx) 3676 goto cont; 3677 if (h > s_h || idx > s_idx) 3678 s_ip_idx = 0; 3679 ip_idx = 0; 3680 idev = __in6_dev_get(dev); 3681 if (!idev) 3682 goto cont; 3683 3684 if (in6_dump_addrs(idev, skb, cb, type, 3685 s_ip_idx, &ip_idx) <= 0) 3686 goto done; 3687 cont: 3688 idx++; 3689 } 3690 } 3691 done: 3692 rcu_read_unlock(); 3693 cb->args[0] = h; 3694 cb->args[1] = idx; 3695 cb->args[2] = ip_idx; 3696 3697 return skb->len; 3698 } 3699 3700 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3701 { 3702 enum addr_type_t type = UNICAST_ADDR; 3703 3704 return inet6_dump_addr(skb, cb, type); 3705 } 3706 3707 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3708 { 3709 enum addr_type_t type = MULTICAST_ADDR; 3710 3711 return inet6_dump_addr(skb, cb, type); 3712 } 3713 3714 3715 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3716 { 3717 enum addr_type_t type = ANYCAST_ADDR; 3718 3719 return inet6_dump_addr(skb, cb, type); 3720 } 3721 3722 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3723 void *arg) 3724 { 3725 struct net *net = sock_net(in_skb->sk); 3726 struct ifaddrmsg *ifm; 3727 struct nlattr *tb[IFA_MAX+1]; 3728 struct in6_addr *addr = NULL; 3729 struct net_device *dev = NULL; 3730 struct inet6_ifaddr *ifa; 3731 struct sk_buff *skb; 3732 int err; 3733 3734 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3735 if (err < 0) 3736 goto errout; 3737 3738 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3739 if (addr == NULL) { 3740 err = -EINVAL; 3741 goto errout; 3742 } 3743 3744 ifm = nlmsg_data(nlh); 3745 if (ifm->ifa_index) 3746 dev = __dev_get_by_index(net, ifm->ifa_index); 3747 3748 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3749 if (!ifa) { 3750 err = -EADDRNOTAVAIL; 3751 goto errout; 3752 } 3753 3754 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3755 if (!skb) { 3756 err = -ENOBUFS; 3757 goto errout_ifa; 3758 } 3759 3760 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3761 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3762 if (err < 0) { 3763 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3764 WARN_ON(err == -EMSGSIZE); 3765 kfree_skb(skb); 3766 goto errout_ifa; 3767 } 3768 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3769 errout_ifa: 3770 in6_ifa_put(ifa); 3771 errout: 3772 return err; 3773 } 3774 3775 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3776 { 3777 struct sk_buff *skb; 3778 struct net *net = dev_net(ifa->idev->dev); 3779 int err = -ENOBUFS; 3780 3781 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3782 if (skb == NULL) 3783 goto errout; 3784 3785 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3786 if (err < 0) { 3787 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3788 WARN_ON(err == -EMSGSIZE); 3789 kfree_skb(skb); 3790 goto errout; 3791 } 3792 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3793 return; 3794 errout: 3795 if (err < 0) 3796 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3797 } 3798 3799 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3800 __s32 *array, int bytes) 3801 { 3802 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3803 3804 memset(array, 0, bytes); 3805 array[DEVCONF_FORWARDING] = cnf->forwarding; 3806 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3807 array[DEVCONF_MTU6] = cnf->mtu6; 3808 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3809 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3810 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3811 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3812 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3813 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3814 jiffies_to_msecs(cnf->rtr_solicit_interval); 3815 array[DEVCONF_RTR_SOLICIT_DELAY] = 3816 jiffies_to_msecs(cnf->rtr_solicit_delay); 3817 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3818 #ifdef CONFIG_IPV6_PRIVACY 3819 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3820 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3821 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3822 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3823 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3824 #endif 3825 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3826 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3827 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3828 #ifdef CONFIG_IPV6_ROUTER_PREF 3829 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3830 array[DEVCONF_RTR_PROBE_INTERVAL] = 3831 jiffies_to_msecs(cnf->rtr_probe_interval); 3832 #ifdef CONFIG_IPV6_ROUTE_INFO 3833 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3834 #endif 3835 #endif 3836 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3837 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3838 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3839 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3840 #endif 3841 #ifdef CONFIG_IPV6_MROUTE 3842 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3843 #endif 3844 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3845 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3846 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3847 } 3848 3849 static inline size_t inet6_ifla6_size(void) 3850 { 3851 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3852 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3853 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3854 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3855 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3856 } 3857 3858 static inline size_t inet6_if_nlmsg_size(void) 3859 { 3860 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3861 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3862 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3863 + nla_total_size(4) /* IFLA_MTU */ 3864 + nla_total_size(4) /* IFLA_LINK */ 3865 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3866 } 3867 3868 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3869 int items, int bytes) 3870 { 3871 int i; 3872 int pad = bytes - sizeof(u64) * items; 3873 BUG_ON(pad < 0); 3874 3875 /* Use put_unaligned() because stats may not be aligned for u64. */ 3876 put_unaligned(items, &stats[0]); 3877 for (i = 1; i < items; i++) 3878 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3879 3880 memset(&stats[items], 0, pad); 3881 } 3882 3883 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3884 int items, int bytes, size_t syncpoff) 3885 { 3886 int i; 3887 int pad = bytes - sizeof(u64) * items; 3888 BUG_ON(pad < 0); 3889 3890 /* Use put_unaligned() because stats may not be aligned for u64. */ 3891 put_unaligned(items, &stats[0]); 3892 for (i = 1; i < items; i++) 3893 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3894 3895 memset(&stats[items], 0, pad); 3896 } 3897 3898 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3899 int bytes) 3900 { 3901 switch (attrtype) { 3902 case IFLA_INET6_STATS: 3903 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3904 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3905 break; 3906 case IFLA_INET6_ICMP6STATS: 3907 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3908 break; 3909 } 3910 } 3911 3912 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3913 { 3914 struct nlattr *nla; 3915 struct ifla_cacheinfo ci; 3916 3917 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3918 3919 ci.max_reasm_len = IPV6_MAXPLEN; 3920 ci.tstamp = cstamp_delta(idev->tstamp); 3921 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3922 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3923 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3924 3925 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3926 if (nla == NULL) 3927 goto nla_put_failure; 3928 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3929 3930 /* XXX - MC not implemented */ 3931 3932 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3933 if (nla == NULL) 3934 goto nla_put_failure; 3935 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3936 3937 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3938 if (nla == NULL) 3939 goto nla_put_failure; 3940 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3941 3942 return 0; 3943 3944 nla_put_failure: 3945 return -EMSGSIZE; 3946 } 3947 3948 static size_t inet6_get_link_af_size(const struct net_device *dev) 3949 { 3950 if (!__in6_dev_get(dev)) 3951 return 0; 3952 3953 return inet6_ifla6_size(); 3954 } 3955 3956 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 3957 { 3958 struct inet6_dev *idev = __in6_dev_get(dev); 3959 3960 if (!idev) 3961 return -ENODATA; 3962 3963 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 3964 return -EMSGSIZE; 3965 3966 return 0; 3967 } 3968 3969 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3970 u32 pid, u32 seq, int event, unsigned int flags) 3971 { 3972 struct net_device *dev = idev->dev; 3973 struct ifinfomsg *hdr; 3974 struct nlmsghdr *nlh; 3975 void *protoinfo; 3976 3977 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3978 if (nlh == NULL) 3979 return -EMSGSIZE; 3980 3981 hdr = nlmsg_data(nlh); 3982 hdr->ifi_family = AF_INET6; 3983 hdr->__ifi_pad = 0; 3984 hdr->ifi_type = dev->type; 3985 hdr->ifi_index = dev->ifindex; 3986 hdr->ifi_flags = dev_get_flags(dev); 3987 hdr->ifi_change = 0; 3988 3989 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3990 3991 if (dev->addr_len) 3992 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3993 3994 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3995 if (dev->ifindex != dev->iflink) 3996 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3997 3998 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3999 if (protoinfo == NULL) 4000 goto nla_put_failure; 4001 4002 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4003 goto nla_put_failure; 4004 4005 nla_nest_end(skb, protoinfo); 4006 return nlmsg_end(skb, nlh); 4007 4008 nla_put_failure: 4009 nlmsg_cancel(skb, nlh); 4010 return -EMSGSIZE; 4011 } 4012 4013 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4014 { 4015 struct net *net = sock_net(skb->sk); 4016 int h, s_h; 4017 int idx = 0, s_idx; 4018 struct net_device *dev; 4019 struct inet6_dev *idev; 4020 struct hlist_head *head; 4021 struct hlist_node *node; 4022 4023 s_h = cb->args[0]; 4024 s_idx = cb->args[1]; 4025 4026 rcu_read_lock(); 4027 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4028 idx = 0; 4029 head = &net->dev_index_head[h]; 4030 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4031 if (idx < s_idx) 4032 goto cont; 4033 idev = __in6_dev_get(dev); 4034 if (!idev) 4035 goto cont; 4036 if (inet6_fill_ifinfo(skb, idev, 4037 NETLINK_CB(cb->skb).pid, 4038 cb->nlh->nlmsg_seq, 4039 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4040 goto out; 4041 cont: 4042 idx++; 4043 } 4044 } 4045 out: 4046 rcu_read_unlock(); 4047 cb->args[1] = idx; 4048 cb->args[0] = h; 4049 4050 return skb->len; 4051 } 4052 4053 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4054 { 4055 struct sk_buff *skb; 4056 struct net *net = dev_net(idev->dev); 4057 int err = -ENOBUFS; 4058 4059 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4060 if (skb == NULL) 4061 goto errout; 4062 4063 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4064 if (err < 0) { 4065 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4066 WARN_ON(err == -EMSGSIZE); 4067 kfree_skb(skb); 4068 goto errout; 4069 } 4070 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4071 return; 4072 errout: 4073 if (err < 0) 4074 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4075 } 4076 4077 static inline size_t inet6_prefix_nlmsg_size(void) 4078 { 4079 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4080 + nla_total_size(sizeof(struct in6_addr)) 4081 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4082 } 4083 4084 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4085 struct prefix_info *pinfo, u32 pid, u32 seq, 4086 int event, unsigned int flags) 4087 { 4088 struct prefixmsg *pmsg; 4089 struct nlmsghdr *nlh; 4090 struct prefix_cacheinfo ci; 4091 4092 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4093 if (nlh == NULL) 4094 return -EMSGSIZE; 4095 4096 pmsg = nlmsg_data(nlh); 4097 pmsg->prefix_family = AF_INET6; 4098 pmsg->prefix_pad1 = 0; 4099 pmsg->prefix_pad2 = 0; 4100 pmsg->prefix_ifindex = idev->dev->ifindex; 4101 pmsg->prefix_len = pinfo->prefix_len; 4102 pmsg->prefix_type = pinfo->type; 4103 pmsg->prefix_pad3 = 0; 4104 pmsg->prefix_flags = 0; 4105 if (pinfo->onlink) 4106 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4107 if (pinfo->autoconf) 4108 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4109 4110 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4111 4112 ci.preferred_time = ntohl(pinfo->prefered); 4113 ci.valid_time = ntohl(pinfo->valid); 4114 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4115 4116 return nlmsg_end(skb, nlh); 4117 4118 nla_put_failure: 4119 nlmsg_cancel(skb, nlh); 4120 return -EMSGSIZE; 4121 } 4122 4123 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4124 struct prefix_info *pinfo) 4125 { 4126 struct sk_buff *skb; 4127 struct net *net = dev_net(idev->dev); 4128 int err = -ENOBUFS; 4129 4130 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4131 if (skb == NULL) 4132 goto errout; 4133 4134 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4135 if (err < 0) { 4136 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4137 WARN_ON(err == -EMSGSIZE); 4138 kfree_skb(skb); 4139 goto errout; 4140 } 4141 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4142 return; 4143 errout: 4144 if (err < 0) 4145 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4146 } 4147 4148 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4149 { 4150 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4151 4152 switch (event) { 4153 case RTM_NEWADDR: 4154 /* 4155 * If the address was optimistic 4156 * we inserted the route at the start of 4157 * our DAD process, so we don't need 4158 * to do it again 4159 */ 4160 if (!(ifp->rt->rt6i_node)) 4161 ip6_ins_rt(ifp->rt); 4162 if (ifp->idev->cnf.forwarding) 4163 addrconf_join_anycast(ifp); 4164 break; 4165 case RTM_DELADDR: 4166 if (ifp->idev->cnf.forwarding) 4167 addrconf_leave_anycast(ifp); 4168 addrconf_leave_solict(ifp->idev, &ifp->addr); 4169 dst_hold(&ifp->rt->dst); 4170 4171 if (ip6_del_rt(ifp->rt)) 4172 dst_free(&ifp->rt->dst); 4173 break; 4174 } 4175 } 4176 4177 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4178 { 4179 rcu_read_lock_bh(); 4180 if (likely(ifp->idev->dead == 0)) 4181 __ipv6_ifa_notify(event, ifp); 4182 rcu_read_unlock_bh(); 4183 } 4184 4185 #ifdef CONFIG_SYSCTL 4186 4187 static 4188 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4189 void __user *buffer, size_t *lenp, loff_t *ppos) 4190 { 4191 int *valp = ctl->data; 4192 int val = *valp; 4193 loff_t pos = *ppos; 4194 int ret; 4195 4196 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4197 4198 if (write) 4199 ret = addrconf_fixup_forwarding(ctl, valp, val); 4200 if (ret) 4201 *ppos = pos; 4202 return ret; 4203 } 4204 4205 static void dev_disable_change(struct inet6_dev *idev) 4206 { 4207 if (!idev || !idev->dev) 4208 return; 4209 4210 if (idev->cnf.disable_ipv6) 4211 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4212 else 4213 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4214 } 4215 4216 static void addrconf_disable_change(struct net *net, __s32 newf) 4217 { 4218 struct net_device *dev; 4219 struct inet6_dev *idev; 4220 4221 rcu_read_lock(); 4222 for_each_netdev_rcu(net, dev) { 4223 idev = __in6_dev_get(dev); 4224 if (idev) { 4225 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4226 idev->cnf.disable_ipv6 = newf; 4227 if (changed) 4228 dev_disable_change(idev); 4229 } 4230 } 4231 rcu_read_unlock(); 4232 } 4233 4234 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4235 { 4236 struct net *net; 4237 4238 net = (struct net *)table->extra2; 4239 4240 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4241 return 0; 4242 4243 if (!rtnl_trylock()) { 4244 /* Restore the original values before restarting */ 4245 *p = old; 4246 return restart_syscall(); 4247 } 4248 4249 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4250 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4251 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4252 addrconf_disable_change(net, newf); 4253 } else if ((!*p) ^ (!old)) 4254 dev_disable_change((struct inet6_dev *)table->extra1); 4255 4256 rtnl_unlock(); 4257 return 0; 4258 } 4259 4260 static 4261 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4262 void __user *buffer, size_t *lenp, loff_t *ppos) 4263 { 4264 int *valp = ctl->data; 4265 int val = *valp; 4266 loff_t pos = *ppos; 4267 int ret; 4268 4269 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4270 4271 if (write) 4272 ret = addrconf_disable_ipv6(ctl, valp, val); 4273 if (ret) 4274 *ppos = pos; 4275 return ret; 4276 } 4277 4278 static struct addrconf_sysctl_table 4279 { 4280 struct ctl_table_header *sysctl_header; 4281 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4282 char *dev_name; 4283 } addrconf_sysctl __read_mostly = { 4284 .sysctl_header = NULL, 4285 .addrconf_vars = { 4286 { 4287 .procname = "forwarding", 4288 .data = &ipv6_devconf.forwarding, 4289 .maxlen = sizeof(int), 4290 .mode = 0644, 4291 .proc_handler = addrconf_sysctl_forward, 4292 }, 4293 { 4294 .procname = "hop_limit", 4295 .data = &ipv6_devconf.hop_limit, 4296 .maxlen = sizeof(int), 4297 .mode = 0644, 4298 .proc_handler = proc_dointvec, 4299 }, 4300 { 4301 .procname = "mtu", 4302 .data = &ipv6_devconf.mtu6, 4303 .maxlen = sizeof(int), 4304 .mode = 0644, 4305 .proc_handler = proc_dointvec, 4306 }, 4307 { 4308 .procname = "accept_ra", 4309 .data = &ipv6_devconf.accept_ra, 4310 .maxlen = sizeof(int), 4311 .mode = 0644, 4312 .proc_handler = proc_dointvec, 4313 }, 4314 { 4315 .procname = "accept_redirects", 4316 .data = &ipv6_devconf.accept_redirects, 4317 .maxlen = sizeof(int), 4318 .mode = 0644, 4319 .proc_handler = proc_dointvec, 4320 }, 4321 { 4322 .procname = "autoconf", 4323 .data = &ipv6_devconf.autoconf, 4324 .maxlen = sizeof(int), 4325 .mode = 0644, 4326 .proc_handler = proc_dointvec, 4327 }, 4328 { 4329 .procname = "dad_transmits", 4330 .data = &ipv6_devconf.dad_transmits, 4331 .maxlen = sizeof(int), 4332 .mode = 0644, 4333 .proc_handler = proc_dointvec, 4334 }, 4335 { 4336 .procname = "router_solicitations", 4337 .data = &ipv6_devconf.rtr_solicits, 4338 .maxlen = sizeof(int), 4339 .mode = 0644, 4340 .proc_handler = proc_dointvec, 4341 }, 4342 { 4343 .procname = "router_solicitation_interval", 4344 .data = &ipv6_devconf.rtr_solicit_interval, 4345 .maxlen = sizeof(int), 4346 .mode = 0644, 4347 .proc_handler = proc_dointvec_jiffies, 4348 }, 4349 { 4350 .procname = "router_solicitation_delay", 4351 .data = &ipv6_devconf.rtr_solicit_delay, 4352 .maxlen = sizeof(int), 4353 .mode = 0644, 4354 .proc_handler = proc_dointvec_jiffies, 4355 }, 4356 { 4357 .procname = "force_mld_version", 4358 .data = &ipv6_devconf.force_mld_version, 4359 .maxlen = sizeof(int), 4360 .mode = 0644, 4361 .proc_handler = proc_dointvec, 4362 }, 4363 #ifdef CONFIG_IPV6_PRIVACY 4364 { 4365 .procname = "use_tempaddr", 4366 .data = &ipv6_devconf.use_tempaddr, 4367 .maxlen = sizeof(int), 4368 .mode = 0644, 4369 .proc_handler = proc_dointvec, 4370 }, 4371 { 4372 .procname = "temp_valid_lft", 4373 .data = &ipv6_devconf.temp_valid_lft, 4374 .maxlen = sizeof(int), 4375 .mode = 0644, 4376 .proc_handler = proc_dointvec, 4377 }, 4378 { 4379 .procname = "temp_prefered_lft", 4380 .data = &ipv6_devconf.temp_prefered_lft, 4381 .maxlen = sizeof(int), 4382 .mode = 0644, 4383 .proc_handler = proc_dointvec, 4384 }, 4385 { 4386 .procname = "regen_max_retry", 4387 .data = &ipv6_devconf.regen_max_retry, 4388 .maxlen = sizeof(int), 4389 .mode = 0644, 4390 .proc_handler = proc_dointvec, 4391 }, 4392 { 4393 .procname = "max_desync_factor", 4394 .data = &ipv6_devconf.max_desync_factor, 4395 .maxlen = sizeof(int), 4396 .mode = 0644, 4397 .proc_handler = proc_dointvec, 4398 }, 4399 #endif 4400 { 4401 .procname = "max_addresses", 4402 .data = &ipv6_devconf.max_addresses, 4403 .maxlen = sizeof(int), 4404 .mode = 0644, 4405 .proc_handler = proc_dointvec, 4406 }, 4407 { 4408 .procname = "accept_ra_defrtr", 4409 .data = &ipv6_devconf.accept_ra_defrtr, 4410 .maxlen = sizeof(int), 4411 .mode = 0644, 4412 .proc_handler = proc_dointvec, 4413 }, 4414 { 4415 .procname = "accept_ra_pinfo", 4416 .data = &ipv6_devconf.accept_ra_pinfo, 4417 .maxlen = sizeof(int), 4418 .mode = 0644, 4419 .proc_handler = proc_dointvec, 4420 }, 4421 #ifdef CONFIG_IPV6_ROUTER_PREF 4422 { 4423 .procname = "accept_ra_rtr_pref", 4424 .data = &ipv6_devconf.accept_ra_rtr_pref, 4425 .maxlen = sizeof(int), 4426 .mode = 0644, 4427 .proc_handler = proc_dointvec, 4428 }, 4429 { 4430 .procname = "router_probe_interval", 4431 .data = &ipv6_devconf.rtr_probe_interval, 4432 .maxlen = sizeof(int), 4433 .mode = 0644, 4434 .proc_handler = proc_dointvec_jiffies, 4435 }, 4436 #ifdef CONFIG_IPV6_ROUTE_INFO 4437 { 4438 .procname = "accept_ra_rt_info_max_plen", 4439 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4440 .maxlen = sizeof(int), 4441 .mode = 0644, 4442 .proc_handler = proc_dointvec, 4443 }, 4444 #endif 4445 #endif 4446 { 4447 .procname = "proxy_ndp", 4448 .data = &ipv6_devconf.proxy_ndp, 4449 .maxlen = sizeof(int), 4450 .mode = 0644, 4451 .proc_handler = proc_dointvec, 4452 }, 4453 { 4454 .procname = "accept_source_route", 4455 .data = &ipv6_devconf.accept_source_route, 4456 .maxlen = sizeof(int), 4457 .mode = 0644, 4458 .proc_handler = proc_dointvec, 4459 }, 4460 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4461 { 4462 .procname = "optimistic_dad", 4463 .data = &ipv6_devconf.optimistic_dad, 4464 .maxlen = sizeof(int), 4465 .mode = 0644, 4466 .proc_handler = proc_dointvec, 4467 4468 }, 4469 #endif 4470 #ifdef CONFIG_IPV6_MROUTE 4471 { 4472 .procname = "mc_forwarding", 4473 .data = &ipv6_devconf.mc_forwarding, 4474 .maxlen = sizeof(int), 4475 .mode = 0444, 4476 .proc_handler = proc_dointvec, 4477 }, 4478 #endif 4479 { 4480 .procname = "disable_ipv6", 4481 .data = &ipv6_devconf.disable_ipv6, 4482 .maxlen = sizeof(int), 4483 .mode = 0644, 4484 .proc_handler = addrconf_sysctl_disable, 4485 }, 4486 { 4487 .procname = "accept_dad", 4488 .data = &ipv6_devconf.accept_dad, 4489 .maxlen = sizeof(int), 4490 .mode = 0644, 4491 .proc_handler = proc_dointvec, 4492 }, 4493 { 4494 .procname = "force_tllao", 4495 .data = &ipv6_devconf.force_tllao, 4496 .maxlen = sizeof(int), 4497 .mode = 0644, 4498 .proc_handler = proc_dointvec 4499 }, 4500 { 4501 /* sentinel */ 4502 } 4503 }, 4504 }; 4505 4506 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4507 struct inet6_dev *idev, struct ipv6_devconf *p) 4508 { 4509 int i; 4510 struct addrconf_sysctl_table *t; 4511 4512 #define ADDRCONF_CTL_PATH_DEV 3 4513 4514 struct ctl_path addrconf_ctl_path[] = { 4515 { .procname = "net", }, 4516 { .procname = "ipv6", }, 4517 { .procname = "conf", }, 4518 { /* to be set */ }, 4519 { }, 4520 }; 4521 4522 4523 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4524 if (t == NULL) 4525 goto out; 4526 4527 for (i = 0; t->addrconf_vars[i].data; i++) { 4528 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4529 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4530 t->addrconf_vars[i].extra2 = net; 4531 } 4532 4533 /* 4534 * Make a copy of dev_name, because '.procname' is regarded as const 4535 * by sysctl and we wouldn't want anyone to change it under our feet 4536 * (see SIOCSIFNAME). 4537 */ 4538 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4539 if (!t->dev_name) 4540 goto free; 4541 4542 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4543 4544 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4545 t->addrconf_vars); 4546 if (t->sysctl_header == NULL) 4547 goto free_procname; 4548 4549 p->sysctl = t; 4550 return 0; 4551 4552 free_procname: 4553 kfree(t->dev_name); 4554 free: 4555 kfree(t); 4556 out: 4557 return -ENOBUFS; 4558 } 4559 4560 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4561 { 4562 struct addrconf_sysctl_table *t; 4563 4564 if (p->sysctl == NULL) 4565 return; 4566 4567 t = p->sysctl; 4568 p->sysctl = NULL; 4569 unregister_net_sysctl_table(t->sysctl_header); 4570 kfree(t->dev_name); 4571 kfree(t); 4572 } 4573 4574 static void addrconf_sysctl_register(struct inet6_dev *idev) 4575 { 4576 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4577 &ndisc_ifinfo_sysctl_change); 4578 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4579 idev, &idev->cnf); 4580 } 4581 4582 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4583 { 4584 __addrconf_sysctl_unregister(&idev->cnf); 4585 neigh_sysctl_unregister(idev->nd_parms); 4586 } 4587 4588 4589 #endif 4590 4591 static int __net_init addrconf_init_net(struct net *net) 4592 { 4593 int err; 4594 struct ipv6_devconf *all, *dflt; 4595 4596 err = -ENOMEM; 4597 all = &ipv6_devconf; 4598 dflt = &ipv6_devconf_dflt; 4599 4600 if (!net_eq(net, &init_net)) { 4601 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4602 if (all == NULL) 4603 goto err_alloc_all; 4604 4605 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4606 if (dflt == NULL) 4607 goto err_alloc_dflt; 4608 } else { 4609 /* these will be inherited by all namespaces */ 4610 dflt->autoconf = ipv6_defaults.autoconf; 4611 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4612 } 4613 4614 net->ipv6.devconf_all = all; 4615 net->ipv6.devconf_dflt = dflt; 4616 4617 #ifdef CONFIG_SYSCTL 4618 err = __addrconf_sysctl_register(net, "all", NULL, all); 4619 if (err < 0) 4620 goto err_reg_all; 4621 4622 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4623 if (err < 0) 4624 goto err_reg_dflt; 4625 #endif 4626 return 0; 4627 4628 #ifdef CONFIG_SYSCTL 4629 err_reg_dflt: 4630 __addrconf_sysctl_unregister(all); 4631 err_reg_all: 4632 kfree(dflt); 4633 #endif 4634 err_alloc_dflt: 4635 kfree(all); 4636 err_alloc_all: 4637 return err; 4638 } 4639 4640 static void __net_exit addrconf_exit_net(struct net *net) 4641 { 4642 #ifdef CONFIG_SYSCTL 4643 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4644 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4645 #endif 4646 if (!net_eq(net, &init_net)) { 4647 kfree(net->ipv6.devconf_dflt); 4648 kfree(net->ipv6.devconf_all); 4649 } 4650 } 4651 4652 static struct pernet_operations addrconf_ops = { 4653 .init = addrconf_init_net, 4654 .exit = addrconf_exit_net, 4655 }; 4656 4657 /* 4658 * Device notifier 4659 */ 4660 4661 int register_inet6addr_notifier(struct notifier_block *nb) 4662 { 4663 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4664 } 4665 EXPORT_SYMBOL(register_inet6addr_notifier); 4666 4667 int unregister_inet6addr_notifier(struct notifier_block *nb) 4668 { 4669 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4670 } 4671 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4672 4673 static struct rtnl_af_ops inet6_ops = { 4674 .family = AF_INET6, 4675 .fill_link_af = inet6_fill_link_af, 4676 .get_link_af_size = inet6_get_link_af_size, 4677 }; 4678 4679 /* 4680 * Init / cleanup code 4681 */ 4682 4683 int __init addrconf_init(void) 4684 { 4685 int i, err; 4686 4687 err = ipv6_addr_label_init(); 4688 if (err < 0) { 4689 printk(KERN_CRIT "IPv6 Addrconf:" 4690 " cannot initialize default policy table: %d.\n", err); 4691 goto out; 4692 } 4693 4694 err = register_pernet_subsys(&addrconf_ops); 4695 if (err < 0) 4696 goto out_addrlabel; 4697 4698 /* The addrconf netdev notifier requires that loopback_dev 4699 * has it's ipv6 private information allocated and setup 4700 * before it can bring up and give link-local addresses 4701 * to other devices which are up. 4702 * 4703 * Unfortunately, loopback_dev is not necessarily the first 4704 * entry in the global dev_base list of net devices. In fact, 4705 * it is likely to be the very last entry on that list. 4706 * So this causes the notifier registry below to try and 4707 * give link-local addresses to all devices besides loopback_dev 4708 * first, then loopback_dev, which cases all the non-loopback_dev 4709 * devices to fail to get a link-local address. 4710 * 4711 * So, as a temporary fix, allocate the ipv6 structure for 4712 * loopback_dev first by hand. 4713 * Longer term, all of the dependencies ipv6 has upon the loopback 4714 * device and it being up should be removed. 4715 */ 4716 rtnl_lock(); 4717 if (!ipv6_add_dev(init_net.loopback_dev)) 4718 err = -ENOMEM; 4719 rtnl_unlock(); 4720 if (err) 4721 goto errlo; 4722 4723 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4724 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4725 4726 register_netdevice_notifier(&ipv6_dev_notf); 4727 4728 addrconf_verify(0); 4729 4730 err = rtnl_af_register(&inet6_ops); 4731 if (err < 0) 4732 goto errout_af; 4733 4734 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4735 NULL); 4736 if (err < 0) 4737 goto errout; 4738 4739 /* Only the first call to __rtnl_register can fail */ 4740 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4741 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4742 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4743 inet6_dump_ifaddr, NULL); 4744 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4745 inet6_dump_ifmcaddr, NULL); 4746 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4747 inet6_dump_ifacaddr, NULL); 4748 4749 ipv6_addr_label_rtnl_register(); 4750 4751 return 0; 4752 errout: 4753 rtnl_af_unregister(&inet6_ops); 4754 errout_af: 4755 unregister_netdevice_notifier(&ipv6_dev_notf); 4756 errlo: 4757 unregister_pernet_subsys(&addrconf_ops); 4758 out_addrlabel: 4759 ipv6_addr_label_cleanup(); 4760 out: 4761 return err; 4762 } 4763 4764 void addrconf_cleanup(void) 4765 { 4766 struct net_device *dev; 4767 int i; 4768 4769 unregister_netdevice_notifier(&ipv6_dev_notf); 4770 unregister_pernet_subsys(&addrconf_ops); 4771 ipv6_addr_label_cleanup(); 4772 4773 rtnl_lock(); 4774 4775 __rtnl_af_unregister(&inet6_ops); 4776 4777 /* clean dev list */ 4778 for_each_netdev(&init_net, dev) { 4779 if (__in6_dev_get(dev) == NULL) 4780 continue; 4781 addrconf_ifdown(dev, 1); 4782 } 4783 addrconf_ifdown(init_net.loopback_dev, 2); 4784 4785 /* 4786 * Check hash table. 4787 */ 4788 spin_lock_bh(&addrconf_hash_lock); 4789 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4790 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4791 spin_unlock_bh(&addrconf_hash_lock); 4792 4793 del_timer(&addr_chk_timer); 4794 rtnl_unlock(); 4795 } 4796