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 #include <linux/export.h> 91 92 /* Set to 3 to get tracing... */ 93 #define ACONF_DEBUG 2 94 95 #if ACONF_DEBUG >= 3 96 #define ADBG(x) printk x 97 #else 98 #define ADBG(x) 99 #endif 100 101 #define INFINITY_LIFE_TIME 0xFFFFFFFF 102 103 static inline u32 cstamp_delta(unsigned long cstamp) 104 { 105 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 106 } 107 108 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 109 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 110 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 111 112 #ifdef CONFIG_SYSCTL 113 static void addrconf_sysctl_register(struct inet6_dev *idev); 114 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 115 #else 116 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 117 { 118 } 119 120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 121 { 122 } 123 #endif 124 125 #ifdef CONFIG_IPV6_PRIVACY 126 static int __ipv6_regen_rndid(struct inet6_dev *idev); 127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 128 static void ipv6_regen_rndid(unsigned long data); 129 #endif 130 131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 132 static int ipv6_count_addresses(struct inet6_dev *idev); 133 134 /* 135 * Configured unicast address hash table 136 */ 137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 138 static DEFINE_SPINLOCK(addrconf_hash_lock); 139 140 static void addrconf_verify(unsigned long); 141 142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 143 static DEFINE_SPINLOCK(addrconf_verify_lock); 144 145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 147 148 static void addrconf_type_change(struct net_device *dev, 149 unsigned long event); 150 static int addrconf_ifdown(struct net_device *dev, int how); 151 152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 153 static void addrconf_dad_timer(unsigned long data); 154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 155 static void addrconf_dad_run(struct inet6_dev *idev); 156 static void addrconf_rs_timer(unsigned long data); 157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 159 160 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 161 struct prefix_info *pinfo); 162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 163 struct net_device *dev); 164 165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 166 167 static struct ipv6_devconf ipv6_devconf __read_mostly = { 168 .forwarding = 0, 169 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 170 .mtu6 = IPV6_MIN_MTU, 171 .accept_ra = 1, 172 .accept_redirects = 1, 173 .autoconf = 1, 174 .force_mld_version = 0, 175 .dad_transmits = 1, 176 .rtr_solicits = MAX_RTR_SOLICITATIONS, 177 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 178 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 179 #ifdef CONFIG_IPV6_PRIVACY 180 .use_tempaddr = 0, 181 .temp_valid_lft = TEMP_VALID_LIFETIME, 182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 183 .regen_max_retry = REGEN_MAX_RETRY, 184 .max_desync_factor = MAX_DESYNC_FACTOR, 185 #endif 186 .max_addresses = IPV6_MAX_ADDRESSES, 187 .accept_ra_defrtr = 1, 188 .accept_ra_pinfo = 1, 189 #ifdef CONFIG_IPV6_ROUTER_PREF 190 .accept_ra_rtr_pref = 1, 191 .rtr_probe_interval = 60 * HZ, 192 #ifdef CONFIG_IPV6_ROUTE_INFO 193 .accept_ra_rt_info_max_plen = 0, 194 #endif 195 #endif 196 .proxy_ndp = 0, 197 .accept_source_route = 0, /* we do not accept RH0 by default. */ 198 .disable_ipv6 = 0, 199 .accept_dad = 1, 200 }; 201 202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 203 .forwarding = 0, 204 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 205 .mtu6 = IPV6_MIN_MTU, 206 .accept_ra = 1, 207 .accept_redirects = 1, 208 .autoconf = 1, 209 .dad_transmits = 1, 210 .rtr_solicits = MAX_RTR_SOLICITATIONS, 211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 #ifdef CONFIG_IPV6_PRIVACY 214 .use_tempaddr = 0, 215 .temp_valid_lft = TEMP_VALID_LIFETIME, 216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 217 .regen_max_retry = REGEN_MAX_RETRY, 218 .max_desync_factor = MAX_DESYNC_FACTOR, 219 #endif 220 .max_addresses = IPV6_MAX_ADDRESSES, 221 .accept_ra_defrtr = 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_max_plen = 0, 228 #endif 229 #endif 230 .proxy_ndp = 0, 231 .accept_source_route = 0, /* we do not accept RH0 by default. */ 232 .disable_ipv6 = 0, 233 .accept_dad = 1, 234 }; 235 236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 241 242 /* Check if a valid qdisc is available */ 243 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 244 { 245 return !qdisc_tx_is_noop(dev); 246 } 247 248 /* Check if a route is valid prefix route */ 249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 250 { 251 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 252 } 253 254 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 255 { 256 if (del_timer(&ifp->timer)) 257 __in6_ifa_put(ifp); 258 } 259 260 enum addrconf_timer_t { 261 AC_NONE, 262 AC_DAD, 263 AC_RS, 264 }; 265 266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 267 enum addrconf_timer_t what, 268 unsigned long when) 269 { 270 if (!del_timer(&ifp->timer)) 271 in6_ifa_hold(ifp); 272 273 switch (what) { 274 case AC_DAD: 275 ifp->timer.function = addrconf_dad_timer; 276 break; 277 case AC_RS: 278 ifp->timer.function = addrconf_rs_timer; 279 break; 280 default: 281 break; 282 } 283 ifp->timer.expires = jiffies + when; 284 add_timer(&ifp->timer); 285 } 286 287 static int snmp6_alloc_dev(struct inet6_dev *idev) 288 { 289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 290 sizeof(struct ipstats_mib), 291 __alignof__(struct ipstats_mib)) < 0) 292 goto err_ip; 293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 294 GFP_KERNEL); 295 if (!idev->stats.icmpv6dev) 296 goto err_icmp; 297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 298 GFP_KERNEL); 299 if (!idev->stats.icmpv6msgdev) 300 goto err_icmpmsg; 301 302 return 0; 303 304 err_icmpmsg: 305 kfree(idev->stats.icmpv6dev); 306 err_icmp: 307 snmp_mib_free((void __percpu **)idev->stats.ipv6); 308 err_ip: 309 return -ENOMEM; 310 } 311 312 static void snmp6_free_dev(struct inet6_dev *idev) 313 { 314 kfree(idev->stats.icmpv6msgdev); 315 kfree(idev->stats.icmpv6dev); 316 snmp_mib_free((void __percpu **)idev->stats.ipv6); 317 } 318 319 /* Nobody refers to this device, we may destroy it. */ 320 321 void in6_dev_finish_destroy(struct inet6_dev *idev) 322 { 323 struct net_device *dev = idev->dev; 324 325 WARN_ON(!list_empty(&idev->addr_list)); 326 WARN_ON(idev->mc_list != NULL); 327 328 #ifdef NET_REFCNT_DEBUG 329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 330 #endif 331 dev_put(dev); 332 if (!idev->dead) { 333 pr_warning("Freeing alive inet6 device %p\n", idev); 334 return; 335 } 336 snmp6_free_dev(idev); 337 kfree_rcu(idev, rcu); 338 } 339 340 EXPORT_SYMBOL(in6_dev_finish_destroy); 341 342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 343 { 344 struct inet6_dev *ndev; 345 346 ASSERT_RTNL(); 347 348 if (dev->mtu < IPV6_MIN_MTU) 349 return NULL; 350 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 352 353 if (ndev == NULL) 354 return NULL; 355 356 rwlock_init(&ndev->lock); 357 ndev->dev = dev; 358 INIT_LIST_HEAD(&ndev->addr_list); 359 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 361 ndev->cnf.mtu6 = dev->mtu; 362 ndev->cnf.sysctl = NULL; 363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 364 if (ndev->nd_parms == NULL) { 365 kfree(ndev); 366 return NULL; 367 } 368 if (ndev->cnf.forwarding) 369 dev_disable_lro(dev); 370 /* We refer to the device */ 371 dev_hold(dev); 372 373 if (snmp6_alloc_dev(ndev) < 0) { 374 ADBG((KERN_WARNING 375 "%s(): cannot allocate memory for statistics; dev=%s.\n", 376 __func__, dev->name)); 377 neigh_parms_release(&nd_tbl, ndev->nd_parms); 378 dev_put(dev); 379 kfree(ndev); 380 return NULL; 381 } 382 383 if (snmp6_register_dev(ndev) < 0) { 384 ADBG((KERN_WARNING 385 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 386 __func__, dev->name)); 387 neigh_parms_release(&nd_tbl, ndev->nd_parms); 388 ndev->dead = 1; 389 in6_dev_finish_destroy(ndev); 390 return NULL; 391 } 392 393 /* One reference from device. We must do this before 394 * we invoke __ipv6_regen_rndid(). 395 */ 396 in6_dev_hold(ndev); 397 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 399 ndev->cnf.accept_dad = -1; 400 401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 403 printk(KERN_INFO 404 "%s: Disabled Multicast RS\n", 405 dev->name); 406 ndev->cnf.rtr_solicits = 0; 407 } 408 #endif 409 410 #ifdef CONFIG_IPV6_PRIVACY 411 INIT_LIST_HEAD(&ndev->tempaddr_list); 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 413 if ((dev->flags&IFF_LOOPBACK) || 414 dev->type == ARPHRD_TUNNEL || 415 dev->type == ARPHRD_TUNNEL6 || 416 dev->type == ARPHRD_SIT || 417 dev->type == ARPHRD_NONE) { 418 ndev->cnf.use_tempaddr = -1; 419 } else { 420 in6_dev_hold(ndev); 421 ipv6_regen_rndid((unsigned long) ndev); 422 } 423 #endif 424 425 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 426 ndev->if_flags |= IF_READY; 427 428 ipv6_mc_init_dev(ndev); 429 ndev->tstamp = jiffies; 430 addrconf_sysctl_register(ndev); 431 /* protected by rtnl_lock */ 432 RCU_INIT_POINTER(dev->ip6_ptr, ndev); 433 434 /* Join all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 436 437 return ndev; 438 } 439 440 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 441 { 442 struct inet6_dev *idev; 443 444 ASSERT_RTNL(); 445 446 idev = __in6_dev_get(dev); 447 if (!idev) { 448 idev = ipv6_add_dev(dev); 449 if (!idev) 450 return NULL; 451 } 452 453 if (dev->flags&IFF_UP) 454 ipv6_mc_up(idev); 455 return idev; 456 } 457 458 #ifdef CONFIG_SYSCTL 459 static void dev_forward_change(struct inet6_dev *idev) 460 { 461 struct net_device *dev; 462 struct inet6_ifaddr *ifa; 463 464 if (!idev) 465 return; 466 dev = idev->dev; 467 if (idev->cnf.forwarding) 468 dev_disable_lro(dev); 469 if (dev && (dev->flags & IFF_MULTICAST)) { 470 if (idev->cnf.forwarding) 471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 472 else 473 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 474 } 475 476 list_for_each_entry(ifa, &idev->addr_list, if_list) { 477 if (ifa->flags&IFA_F_TENTATIVE) 478 continue; 479 if (idev->cnf.forwarding) 480 addrconf_join_anycast(ifa); 481 else 482 addrconf_leave_anycast(ifa); 483 } 484 } 485 486 487 static void addrconf_forward_change(struct net *net, __s32 newf) 488 { 489 struct net_device *dev; 490 struct inet6_dev *idev; 491 492 rcu_read_lock(); 493 for_each_netdev_rcu(net, dev) { 494 idev = __in6_dev_get(dev); 495 if (idev) { 496 int changed = (!idev->cnf.forwarding) ^ (!newf); 497 idev->cnf.forwarding = newf; 498 if (changed) 499 dev_forward_change(idev); 500 } 501 } 502 rcu_read_unlock(); 503 } 504 505 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 506 { 507 struct net *net; 508 509 net = (struct net *)table->extra2; 510 if (p == &net->ipv6.devconf_dflt->forwarding) 511 return 0; 512 513 if (!rtnl_trylock()) { 514 /* Restore the original values before restarting */ 515 *p = old; 516 return restart_syscall(); 517 } 518 519 if (p == &net->ipv6.devconf_all->forwarding) { 520 __s32 newf = net->ipv6.devconf_all->forwarding; 521 net->ipv6.devconf_dflt->forwarding = newf; 522 addrconf_forward_change(net, newf); 523 } else if ((!*p) ^ (!old)) 524 dev_forward_change((struct inet6_dev *)table->extra1); 525 rtnl_unlock(); 526 527 if (*p) 528 rt6_purge_dflt_routers(net); 529 return 1; 530 } 531 #endif 532 533 /* Nobody refers to this ifaddr, destroy it */ 534 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 535 { 536 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 537 538 #ifdef NET_REFCNT_DEBUG 539 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 540 #endif 541 542 in6_dev_put(ifp->idev); 543 544 if (del_timer(&ifp->timer)) 545 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 546 547 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 548 pr_warning("Freeing alive inet6 address %p\n", ifp); 549 return; 550 } 551 dst_release(&ifp->rt->dst); 552 553 kfree_rcu(ifp, rcu); 554 } 555 556 static void 557 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 558 { 559 struct list_head *p; 560 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 561 562 /* 563 * Each device address list is sorted in order of scope - 564 * global before linklocal. 565 */ 566 list_for_each(p, &idev->addr_list) { 567 struct inet6_ifaddr *ifa 568 = list_entry(p, struct inet6_ifaddr, if_list); 569 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 570 break; 571 } 572 573 list_add_tail(&ifp->if_list, p); 574 } 575 576 static u32 ipv6_addr_hash(const struct in6_addr *addr) 577 { 578 /* 579 * We perform the hash function over the last 64 bits of the address 580 * This will include the IEEE address token on links that support it. 581 */ 582 return jhash_2words((__force u32)addr->s6_addr32[2], 583 (__force u32)addr->s6_addr32[3], 0) 584 & (IN6_ADDR_HSIZE - 1); 585 } 586 587 /* On success it returns ifp with increased reference count */ 588 589 static struct inet6_ifaddr * 590 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 591 int scope, u32 flags) 592 { 593 struct inet6_ifaddr *ifa = NULL; 594 struct rt6_info *rt; 595 unsigned int hash; 596 int err = 0; 597 int addr_type = ipv6_addr_type(addr); 598 599 if (addr_type == IPV6_ADDR_ANY || 600 addr_type & IPV6_ADDR_MULTICAST || 601 (!(idev->dev->flags & IFF_LOOPBACK) && 602 addr_type & IPV6_ADDR_LOOPBACK)) 603 return ERR_PTR(-EADDRNOTAVAIL); 604 605 rcu_read_lock_bh(); 606 if (idev->dead) { 607 err = -ENODEV; /*XXX*/ 608 goto out2; 609 } 610 611 if (idev->cnf.disable_ipv6) { 612 err = -EACCES; 613 goto out2; 614 } 615 616 spin_lock(&addrconf_hash_lock); 617 618 /* Ignore adding duplicate addresses on an interface */ 619 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 620 ADBG(("ipv6_add_addr: already assigned\n")); 621 err = -EEXIST; 622 goto out; 623 } 624 625 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 626 627 if (ifa == NULL) { 628 ADBG(("ipv6_add_addr: malloc failed\n")); 629 err = -ENOBUFS; 630 goto out; 631 } 632 633 rt = addrconf_dst_alloc(idev, addr, 0); 634 if (IS_ERR(rt)) { 635 err = PTR_ERR(rt); 636 goto out; 637 } 638 639 ipv6_addr_copy(&ifa->addr, addr); 640 641 spin_lock_init(&ifa->lock); 642 spin_lock_init(&ifa->state_lock); 643 init_timer(&ifa->timer); 644 INIT_HLIST_NODE(&ifa->addr_lst); 645 ifa->timer.data = (unsigned long) ifa; 646 ifa->scope = scope; 647 ifa->prefix_len = pfxlen; 648 ifa->flags = flags | IFA_F_TENTATIVE; 649 ifa->cstamp = ifa->tstamp = jiffies; 650 651 ifa->rt = rt; 652 653 /* 654 * part one of RFC 4429, section 3.3 655 * We should not configure an address as 656 * optimistic if we do not yet know the link 657 * layer address of our nexhop router 658 */ 659 660 if (dst_get_neighbour_raw(&rt->dst) == NULL) 661 ifa->flags &= ~IFA_F_OPTIMISTIC; 662 663 ifa->idev = idev; 664 in6_dev_hold(idev); 665 /* For caller */ 666 in6_ifa_hold(ifa); 667 668 /* Add to big hash table */ 669 hash = ipv6_addr_hash(addr); 670 671 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 672 spin_unlock(&addrconf_hash_lock); 673 674 write_lock(&idev->lock); 675 /* Add to inet6_dev unicast addr list. */ 676 ipv6_link_dev_addr(idev, ifa); 677 678 #ifdef CONFIG_IPV6_PRIVACY 679 if (ifa->flags&IFA_F_TEMPORARY) { 680 list_add(&ifa->tmp_list, &idev->tempaddr_list); 681 in6_ifa_hold(ifa); 682 } 683 #endif 684 685 in6_ifa_hold(ifa); 686 write_unlock(&idev->lock); 687 out2: 688 rcu_read_unlock_bh(); 689 690 if (likely(err == 0)) 691 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 692 else { 693 kfree(ifa); 694 ifa = ERR_PTR(err); 695 } 696 697 return ifa; 698 out: 699 spin_unlock(&addrconf_hash_lock); 700 goto out2; 701 } 702 703 /* This function wants to get referenced ifp and releases it before return */ 704 705 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 706 { 707 struct inet6_ifaddr *ifa, *ifn; 708 struct inet6_dev *idev = ifp->idev; 709 int state; 710 int deleted = 0, onlink = 0; 711 unsigned long expires = jiffies; 712 713 spin_lock_bh(&ifp->state_lock); 714 state = ifp->state; 715 ifp->state = INET6_IFADDR_STATE_DEAD; 716 spin_unlock_bh(&ifp->state_lock); 717 718 if (state == INET6_IFADDR_STATE_DEAD) 719 goto out; 720 721 spin_lock_bh(&addrconf_hash_lock); 722 hlist_del_init_rcu(&ifp->addr_lst); 723 spin_unlock_bh(&addrconf_hash_lock); 724 725 write_lock_bh(&idev->lock); 726 #ifdef CONFIG_IPV6_PRIVACY 727 if (ifp->flags&IFA_F_TEMPORARY) { 728 list_del(&ifp->tmp_list); 729 if (ifp->ifpub) { 730 in6_ifa_put(ifp->ifpub); 731 ifp->ifpub = NULL; 732 } 733 __in6_ifa_put(ifp); 734 } 735 #endif 736 737 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 738 if (ifa == ifp) { 739 list_del_init(&ifp->if_list); 740 __in6_ifa_put(ifp); 741 742 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 743 break; 744 deleted = 1; 745 continue; 746 } else if (ifp->flags & IFA_F_PERMANENT) { 747 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 748 ifp->prefix_len)) { 749 if (ifa->flags & IFA_F_PERMANENT) { 750 onlink = 1; 751 if (deleted) 752 break; 753 } else { 754 unsigned long lifetime; 755 756 if (!onlink) 757 onlink = -1; 758 759 spin_lock(&ifa->lock); 760 761 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 762 /* 763 * Note: Because this address is 764 * not permanent, lifetime < 765 * LONG_MAX / HZ here. 766 */ 767 if (time_before(expires, 768 ifa->tstamp + lifetime * HZ)) 769 expires = ifa->tstamp + lifetime * HZ; 770 spin_unlock(&ifa->lock); 771 } 772 } 773 } 774 } 775 write_unlock_bh(&idev->lock); 776 777 addrconf_del_timer(ifp); 778 779 ipv6_ifa_notify(RTM_DELADDR, ifp); 780 781 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 782 783 /* 784 * Purge or update corresponding prefix 785 * 786 * 1) we don't purge prefix here if address was not permanent. 787 * prefix is managed by its own lifetime. 788 * 2) if there're no addresses, delete prefix. 789 * 3) if there're still other permanent address(es), 790 * corresponding prefix is still permanent. 791 * 4) otherwise, update prefix lifetime to the 792 * longest valid lifetime among the corresponding 793 * addresses on the device. 794 * Note: subsequent RA will update lifetime. 795 * 796 * --yoshfuji 797 */ 798 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 799 struct in6_addr prefix; 800 struct rt6_info *rt; 801 struct net *net = dev_net(ifp->idev->dev); 802 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 803 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 804 805 if (rt && addrconf_is_prefix_route(rt)) { 806 if (onlink == 0) { 807 ip6_del_rt(rt); 808 rt = NULL; 809 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 810 rt->rt6i_expires = expires; 811 rt->rt6i_flags |= RTF_EXPIRES; 812 } 813 } 814 dst_release(&rt->dst); 815 } 816 817 /* clean up prefsrc entries */ 818 rt6_remove_prefsrc(ifp); 819 out: 820 in6_ifa_put(ifp); 821 } 822 823 #ifdef CONFIG_IPV6_PRIVACY 824 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 825 { 826 struct inet6_dev *idev = ifp->idev; 827 struct in6_addr addr, *tmpaddr; 828 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 829 unsigned long regen_advance; 830 int tmp_plen; 831 int ret = 0; 832 int max_addresses; 833 u32 addr_flags; 834 unsigned long now = jiffies; 835 836 write_lock(&idev->lock); 837 if (ift) { 838 spin_lock_bh(&ift->lock); 839 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 840 spin_unlock_bh(&ift->lock); 841 tmpaddr = &addr; 842 } else { 843 tmpaddr = NULL; 844 } 845 retry: 846 in6_dev_hold(idev); 847 if (idev->cnf.use_tempaddr <= 0) { 848 write_unlock(&idev->lock); 849 printk(KERN_INFO 850 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 851 in6_dev_put(idev); 852 ret = -1; 853 goto out; 854 } 855 spin_lock_bh(&ifp->lock); 856 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 857 idev->cnf.use_tempaddr = -1; /*XXX*/ 858 spin_unlock_bh(&ifp->lock); 859 write_unlock(&idev->lock); 860 printk(KERN_WARNING 861 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 862 in6_dev_put(idev); 863 ret = -1; 864 goto out; 865 } 866 in6_ifa_hold(ifp); 867 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 868 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 869 spin_unlock_bh(&ifp->lock); 870 write_unlock(&idev->lock); 871 printk(KERN_WARNING 872 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 873 in6_ifa_put(ifp); 874 in6_dev_put(idev); 875 ret = -1; 876 goto out; 877 } 878 memcpy(&addr.s6_addr[8], idev->rndid, 8); 879 age = (now - ifp->tstamp) / HZ; 880 tmp_valid_lft = min_t(__u32, 881 ifp->valid_lft, 882 idev->cnf.temp_valid_lft + age); 883 tmp_prefered_lft = min_t(__u32, 884 ifp->prefered_lft, 885 idev->cnf.temp_prefered_lft + age - 886 idev->cnf.max_desync_factor); 887 tmp_plen = ifp->prefix_len; 888 max_addresses = idev->cnf.max_addresses; 889 tmp_tstamp = ifp->tstamp; 890 spin_unlock_bh(&ifp->lock); 891 892 regen_advance = idev->cnf.regen_max_retry * 893 idev->cnf.dad_transmits * 894 idev->nd_parms->retrans_time / HZ; 895 write_unlock(&idev->lock); 896 897 /* A temporary address is created only if this calculated Preferred 898 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 899 * an implementation must not create a temporary address with a zero 900 * Preferred Lifetime. 901 */ 902 if (tmp_prefered_lft <= regen_advance) { 903 in6_ifa_put(ifp); 904 in6_dev_put(idev); 905 ret = -1; 906 goto out; 907 } 908 909 addr_flags = IFA_F_TEMPORARY; 910 /* set in addrconf_prefix_rcv() */ 911 if (ifp->flags & IFA_F_OPTIMISTIC) 912 addr_flags |= IFA_F_OPTIMISTIC; 913 914 ift = !max_addresses || 915 ipv6_count_addresses(idev) < max_addresses ? 916 ipv6_add_addr(idev, &addr, tmp_plen, 917 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 918 addr_flags) : NULL; 919 if (!ift || IS_ERR(ift)) { 920 in6_ifa_put(ifp); 921 in6_dev_put(idev); 922 printk(KERN_INFO 923 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 924 tmpaddr = &addr; 925 write_lock(&idev->lock); 926 goto retry; 927 } 928 929 spin_lock_bh(&ift->lock); 930 ift->ifpub = ifp; 931 ift->valid_lft = tmp_valid_lft; 932 ift->prefered_lft = tmp_prefered_lft; 933 ift->cstamp = now; 934 ift->tstamp = tmp_tstamp; 935 spin_unlock_bh(&ift->lock); 936 937 addrconf_dad_start(ift, 0); 938 in6_ifa_put(ift); 939 in6_dev_put(idev); 940 out: 941 return ret; 942 } 943 #endif 944 945 /* 946 * Choose an appropriate source address (RFC3484) 947 */ 948 enum { 949 IPV6_SADDR_RULE_INIT = 0, 950 IPV6_SADDR_RULE_LOCAL, 951 IPV6_SADDR_RULE_SCOPE, 952 IPV6_SADDR_RULE_PREFERRED, 953 #ifdef CONFIG_IPV6_MIP6 954 IPV6_SADDR_RULE_HOA, 955 #endif 956 IPV6_SADDR_RULE_OIF, 957 IPV6_SADDR_RULE_LABEL, 958 #ifdef CONFIG_IPV6_PRIVACY 959 IPV6_SADDR_RULE_PRIVACY, 960 #endif 961 IPV6_SADDR_RULE_ORCHID, 962 IPV6_SADDR_RULE_PREFIX, 963 IPV6_SADDR_RULE_MAX 964 }; 965 966 struct ipv6_saddr_score { 967 int rule; 968 int addr_type; 969 struct inet6_ifaddr *ifa; 970 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 971 int scopedist; 972 int matchlen; 973 }; 974 975 struct ipv6_saddr_dst { 976 const struct in6_addr *addr; 977 int ifindex; 978 int scope; 979 int label; 980 unsigned int prefs; 981 }; 982 983 static inline int ipv6_saddr_preferred(int type) 984 { 985 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 986 return 1; 987 return 0; 988 } 989 990 static int ipv6_get_saddr_eval(struct net *net, 991 struct ipv6_saddr_score *score, 992 struct ipv6_saddr_dst *dst, 993 int i) 994 { 995 int ret; 996 997 if (i <= score->rule) { 998 switch (i) { 999 case IPV6_SADDR_RULE_SCOPE: 1000 ret = score->scopedist; 1001 break; 1002 case IPV6_SADDR_RULE_PREFIX: 1003 ret = score->matchlen; 1004 break; 1005 default: 1006 ret = !!test_bit(i, score->scorebits); 1007 } 1008 goto out; 1009 } 1010 1011 switch (i) { 1012 case IPV6_SADDR_RULE_INIT: 1013 /* Rule 0: remember if hiscore is not ready yet */ 1014 ret = !!score->ifa; 1015 break; 1016 case IPV6_SADDR_RULE_LOCAL: 1017 /* Rule 1: Prefer same address */ 1018 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1019 break; 1020 case IPV6_SADDR_RULE_SCOPE: 1021 /* Rule 2: Prefer appropriate scope 1022 * 1023 * ret 1024 * ^ 1025 * -1 | d 15 1026 * ---+--+-+---> scope 1027 * | 1028 * | d is scope of the destination. 1029 * B-d | \ 1030 * | \ <- smaller scope is better if 1031 * B-15 | \ if scope is enough for destinaion. 1032 * | ret = B - scope (-1 <= scope >= d <= 15). 1033 * d-C-1 | / 1034 * |/ <- greater is better 1035 * -C / if scope is not enough for destination. 1036 * /| ret = scope - C (-1 <= d < scope <= 15). 1037 * 1038 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1039 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1040 * Assume B = 0 and we get C > 29. 1041 */ 1042 ret = __ipv6_addr_src_scope(score->addr_type); 1043 if (ret >= dst->scope) 1044 ret = -ret; 1045 else 1046 ret -= 128; /* 30 is enough */ 1047 score->scopedist = ret; 1048 break; 1049 case IPV6_SADDR_RULE_PREFERRED: 1050 /* Rule 3: Avoid deprecated and optimistic addresses */ 1051 ret = ipv6_saddr_preferred(score->addr_type) || 1052 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1053 break; 1054 #ifdef CONFIG_IPV6_MIP6 1055 case IPV6_SADDR_RULE_HOA: 1056 { 1057 /* Rule 4: Prefer home address */ 1058 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1059 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1060 break; 1061 } 1062 #endif 1063 case IPV6_SADDR_RULE_OIF: 1064 /* Rule 5: Prefer outgoing interface */ 1065 ret = (!dst->ifindex || 1066 dst->ifindex == score->ifa->idev->dev->ifindex); 1067 break; 1068 case IPV6_SADDR_RULE_LABEL: 1069 /* Rule 6: Prefer matching label */ 1070 ret = ipv6_addr_label(net, 1071 &score->ifa->addr, score->addr_type, 1072 score->ifa->idev->dev->ifindex) == dst->label; 1073 break; 1074 #ifdef CONFIG_IPV6_PRIVACY 1075 case IPV6_SADDR_RULE_PRIVACY: 1076 { 1077 /* Rule 7: Prefer public address 1078 * Note: prefer temporary address if use_tempaddr >= 2 1079 */ 1080 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1081 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1082 score->ifa->idev->cnf.use_tempaddr >= 2; 1083 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1084 break; 1085 } 1086 #endif 1087 case IPV6_SADDR_RULE_ORCHID: 1088 /* Rule 8-: Prefer ORCHID vs ORCHID or 1089 * non-ORCHID vs non-ORCHID 1090 */ 1091 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1092 ipv6_addr_orchid(dst->addr)); 1093 break; 1094 case IPV6_SADDR_RULE_PREFIX: 1095 /* Rule 8: Use longest matching prefix */ 1096 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1097 dst->addr); 1098 break; 1099 default: 1100 ret = 0; 1101 } 1102 1103 if (ret) 1104 __set_bit(i, score->scorebits); 1105 score->rule = i; 1106 out: 1107 return ret; 1108 } 1109 1110 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1111 const struct in6_addr *daddr, unsigned int prefs, 1112 struct in6_addr *saddr) 1113 { 1114 struct ipv6_saddr_score scores[2], 1115 *score = &scores[0], *hiscore = &scores[1]; 1116 struct ipv6_saddr_dst dst; 1117 struct net_device *dev; 1118 int dst_type; 1119 1120 dst_type = __ipv6_addr_type(daddr); 1121 dst.addr = daddr; 1122 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1123 dst.scope = __ipv6_addr_src_scope(dst_type); 1124 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1125 dst.prefs = prefs; 1126 1127 hiscore->rule = -1; 1128 hiscore->ifa = NULL; 1129 1130 rcu_read_lock(); 1131 1132 for_each_netdev_rcu(net, dev) { 1133 struct inet6_dev *idev; 1134 1135 /* Candidate Source Address (section 4) 1136 * - multicast and link-local destination address, 1137 * the set of candidate source address MUST only 1138 * include addresses assigned to interfaces 1139 * belonging to the same link as the outgoing 1140 * interface. 1141 * (- For site-local destination addresses, the 1142 * set of candidate source addresses MUST only 1143 * include addresses assigned to interfaces 1144 * belonging to the same site as the outgoing 1145 * interface.) 1146 */ 1147 if (((dst_type & IPV6_ADDR_MULTICAST) || 1148 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1149 dst.ifindex && dev->ifindex != dst.ifindex) 1150 continue; 1151 1152 idev = __in6_dev_get(dev); 1153 if (!idev) 1154 continue; 1155 1156 read_lock_bh(&idev->lock); 1157 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1158 int i; 1159 1160 /* 1161 * - Tentative Address (RFC2462 section 5.4) 1162 * - A tentative address is not considered 1163 * "assigned to an interface" in the traditional 1164 * sense, unless it is also flagged as optimistic. 1165 * - Candidate Source Address (section 4) 1166 * - In any case, anycast addresses, multicast 1167 * addresses, and the unspecified address MUST 1168 * NOT be included in a candidate set. 1169 */ 1170 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1171 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1172 continue; 1173 1174 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1175 1176 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1177 score->addr_type & IPV6_ADDR_MULTICAST)) { 1178 LIMIT_NETDEBUG(KERN_DEBUG 1179 "ADDRCONF: unspecified / multicast address " 1180 "assigned as unicast address on %s", 1181 dev->name); 1182 continue; 1183 } 1184 1185 score->rule = -1; 1186 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1187 1188 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1189 int minihiscore, miniscore; 1190 1191 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1192 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1193 1194 if (minihiscore > miniscore) { 1195 if (i == IPV6_SADDR_RULE_SCOPE && 1196 score->scopedist > 0) { 1197 /* 1198 * special case: 1199 * each remaining entry 1200 * has too small (not enough) 1201 * scope, because ifa entries 1202 * are sorted by their scope 1203 * values. 1204 */ 1205 goto try_nextdev; 1206 } 1207 break; 1208 } else if (minihiscore < miniscore) { 1209 if (hiscore->ifa) 1210 in6_ifa_put(hiscore->ifa); 1211 1212 in6_ifa_hold(score->ifa); 1213 1214 swap(hiscore, score); 1215 1216 /* restore our iterator */ 1217 score->ifa = hiscore->ifa; 1218 1219 break; 1220 } 1221 } 1222 } 1223 try_nextdev: 1224 read_unlock_bh(&idev->lock); 1225 } 1226 rcu_read_unlock(); 1227 1228 if (!hiscore->ifa) 1229 return -EADDRNOTAVAIL; 1230 1231 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1232 in6_ifa_put(hiscore->ifa); 1233 return 0; 1234 } 1235 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1236 1237 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1238 unsigned char banned_flags) 1239 { 1240 struct inet6_dev *idev; 1241 int err = -EADDRNOTAVAIL; 1242 1243 rcu_read_lock(); 1244 idev = __in6_dev_get(dev); 1245 if (idev) { 1246 struct inet6_ifaddr *ifp; 1247 1248 read_lock_bh(&idev->lock); 1249 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1250 if (ifp->scope == IFA_LINK && 1251 !(ifp->flags & banned_flags)) { 1252 ipv6_addr_copy(addr, &ifp->addr); 1253 err = 0; 1254 break; 1255 } 1256 } 1257 read_unlock_bh(&idev->lock); 1258 } 1259 rcu_read_unlock(); 1260 return err; 1261 } 1262 1263 static int ipv6_count_addresses(struct inet6_dev *idev) 1264 { 1265 int cnt = 0; 1266 struct inet6_ifaddr *ifp; 1267 1268 read_lock_bh(&idev->lock); 1269 list_for_each_entry(ifp, &idev->addr_list, if_list) 1270 cnt++; 1271 read_unlock_bh(&idev->lock); 1272 return cnt; 1273 } 1274 1275 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1276 struct net_device *dev, int strict) 1277 { 1278 struct inet6_ifaddr *ifp; 1279 struct hlist_node *node; 1280 unsigned int hash = ipv6_addr_hash(addr); 1281 1282 rcu_read_lock_bh(); 1283 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1284 if (!net_eq(dev_net(ifp->idev->dev), net)) 1285 continue; 1286 if (ipv6_addr_equal(&ifp->addr, addr) && 1287 !(ifp->flags&IFA_F_TENTATIVE) && 1288 (dev == NULL || ifp->idev->dev == dev || 1289 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1290 rcu_read_unlock_bh(); 1291 return 1; 1292 } 1293 } 1294 1295 rcu_read_unlock_bh(); 1296 return 0; 1297 } 1298 EXPORT_SYMBOL(ipv6_chk_addr); 1299 1300 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1301 struct net_device *dev) 1302 { 1303 unsigned int hash = ipv6_addr_hash(addr); 1304 struct inet6_ifaddr *ifp; 1305 struct hlist_node *node; 1306 1307 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1308 if (!net_eq(dev_net(ifp->idev->dev), net)) 1309 continue; 1310 if (ipv6_addr_equal(&ifp->addr, addr)) { 1311 if (dev == NULL || ifp->idev->dev == dev) 1312 return true; 1313 } 1314 } 1315 return false; 1316 } 1317 1318 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1319 { 1320 struct inet6_dev *idev; 1321 struct inet6_ifaddr *ifa; 1322 int onlink; 1323 1324 onlink = 0; 1325 rcu_read_lock(); 1326 idev = __in6_dev_get(dev); 1327 if (idev) { 1328 read_lock_bh(&idev->lock); 1329 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1330 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1331 ifa->prefix_len); 1332 if (onlink) 1333 break; 1334 } 1335 read_unlock_bh(&idev->lock); 1336 } 1337 rcu_read_unlock(); 1338 return onlink; 1339 } 1340 1341 EXPORT_SYMBOL(ipv6_chk_prefix); 1342 1343 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1344 struct net_device *dev, int strict) 1345 { 1346 struct inet6_ifaddr *ifp, *result = NULL; 1347 unsigned int hash = ipv6_addr_hash(addr); 1348 struct hlist_node *node; 1349 1350 rcu_read_lock_bh(); 1351 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1352 if (!net_eq(dev_net(ifp->idev->dev), net)) 1353 continue; 1354 if (ipv6_addr_equal(&ifp->addr, addr)) { 1355 if (dev == NULL || ifp->idev->dev == dev || 1356 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1357 result = ifp; 1358 in6_ifa_hold(ifp); 1359 break; 1360 } 1361 } 1362 } 1363 rcu_read_unlock_bh(); 1364 1365 return result; 1366 } 1367 1368 /* Gets referenced address, destroys ifaddr */ 1369 1370 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1371 { 1372 if (ifp->flags&IFA_F_PERMANENT) { 1373 spin_lock_bh(&ifp->lock); 1374 addrconf_del_timer(ifp); 1375 ifp->flags |= IFA_F_TENTATIVE; 1376 if (dad_failed) 1377 ifp->flags |= IFA_F_DADFAILED; 1378 spin_unlock_bh(&ifp->lock); 1379 if (dad_failed) 1380 ipv6_ifa_notify(0, ifp); 1381 in6_ifa_put(ifp); 1382 #ifdef CONFIG_IPV6_PRIVACY 1383 } else if (ifp->flags&IFA_F_TEMPORARY) { 1384 struct inet6_ifaddr *ifpub; 1385 spin_lock_bh(&ifp->lock); 1386 ifpub = ifp->ifpub; 1387 if (ifpub) { 1388 in6_ifa_hold(ifpub); 1389 spin_unlock_bh(&ifp->lock); 1390 ipv6_create_tempaddr(ifpub, ifp); 1391 in6_ifa_put(ifpub); 1392 } else { 1393 spin_unlock_bh(&ifp->lock); 1394 } 1395 ipv6_del_addr(ifp); 1396 #endif 1397 } else 1398 ipv6_del_addr(ifp); 1399 } 1400 1401 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1402 { 1403 int err = -ENOENT; 1404 1405 spin_lock(&ifp->state_lock); 1406 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1407 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1408 err = 0; 1409 } 1410 spin_unlock(&ifp->state_lock); 1411 1412 return err; 1413 } 1414 1415 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1416 { 1417 struct inet6_dev *idev = ifp->idev; 1418 1419 if (addrconf_dad_end(ifp)) { 1420 in6_ifa_put(ifp); 1421 return; 1422 } 1423 1424 if (net_ratelimit()) 1425 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1426 ifp->idev->dev->name, &ifp->addr); 1427 1428 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1429 struct in6_addr addr; 1430 1431 addr.s6_addr32[0] = htonl(0xfe800000); 1432 addr.s6_addr32[1] = 0; 1433 1434 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1435 ipv6_addr_equal(&ifp->addr, &addr)) { 1436 /* DAD failed for link-local based on MAC address */ 1437 idev->cnf.disable_ipv6 = 1; 1438 1439 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1440 ifp->idev->dev->name); 1441 } 1442 } 1443 1444 addrconf_dad_stop(ifp, 1); 1445 } 1446 1447 /* Join to solicited addr multicast group. */ 1448 1449 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1450 { 1451 struct in6_addr maddr; 1452 1453 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1454 return; 1455 1456 addrconf_addr_solict_mult(addr, &maddr); 1457 ipv6_dev_mc_inc(dev, &maddr); 1458 } 1459 1460 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1461 { 1462 struct in6_addr maddr; 1463 1464 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1465 return; 1466 1467 addrconf_addr_solict_mult(addr, &maddr); 1468 __ipv6_dev_mc_dec(idev, &maddr); 1469 } 1470 1471 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1472 { 1473 struct in6_addr addr; 1474 if (ifp->prefix_len == 127) /* RFC 6164 */ 1475 return; 1476 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1477 if (ipv6_addr_any(&addr)) 1478 return; 1479 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1480 } 1481 1482 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1483 { 1484 struct in6_addr addr; 1485 if (ifp->prefix_len == 127) /* RFC 6164 */ 1486 return; 1487 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1488 if (ipv6_addr_any(&addr)) 1489 return; 1490 __ipv6_dev_ac_dec(ifp->idev, &addr); 1491 } 1492 1493 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1494 { 1495 if (dev->addr_len != ETH_ALEN) 1496 return -1; 1497 memcpy(eui, dev->dev_addr, 3); 1498 memcpy(eui + 5, dev->dev_addr + 3, 3); 1499 1500 /* 1501 * The zSeries OSA network cards can be shared among various 1502 * OS instances, but the OSA cards have only one MAC address. 1503 * This leads to duplicate address conflicts in conjunction 1504 * with IPv6 if more than one instance uses the same card. 1505 * 1506 * The driver for these cards can deliver a unique 16-bit 1507 * identifier for each instance sharing the same card. It is 1508 * placed instead of 0xFFFE in the interface identifier. The 1509 * "u" bit of the interface identifier is not inverted in this 1510 * case. Hence the resulting interface identifier has local 1511 * scope according to RFC2373. 1512 */ 1513 if (dev->dev_id) { 1514 eui[3] = (dev->dev_id >> 8) & 0xFF; 1515 eui[4] = dev->dev_id & 0xFF; 1516 } else { 1517 eui[3] = 0xFF; 1518 eui[4] = 0xFE; 1519 eui[0] ^= 2; 1520 } 1521 return 0; 1522 } 1523 1524 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1525 { 1526 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1527 if (dev->addr_len != ARCNET_ALEN) 1528 return -1; 1529 memset(eui, 0, 7); 1530 eui[7] = *(u8*)dev->dev_addr; 1531 return 0; 1532 } 1533 1534 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1535 { 1536 if (dev->addr_len != INFINIBAND_ALEN) 1537 return -1; 1538 memcpy(eui, dev->dev_addr + 12, 8); 1539 eui[0] |= 2; 1540 return 0; 1541 } 1542 1543 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1544 { 1545 if (addr == 0) 1546 return -1; 1547 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1548 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1549 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1550 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1551 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1552 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1553 eui[1] = 0; 1554 eui[2] = 0x5E; 1555 eui[3] = 0xFE; 1556 memcpy(eui + 4, &addr, 4); 1557 return 0; 1558 } 1559 1560 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1561 { 1562 if (dev->priv_flags & IFF_ISATAP) 1563 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1564 return -1; 1565 } 1566 1567 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1568 { 1569 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1570 } 1571 1572 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1573 { 1574 switch (dev->type) { 1575 case ARPHRD_ETHER: 1576 case ARPHRD_FDDI: 1577 case ARPHRD_IEEE802_TR: 1578 return addrconf_ifid_eui48(eui, dev); 1579 case ARPHRD_ARCNET: 1580 return addrconf_ifid_arcnet(eui, dev); 1581 case ARPHRD_INFINIBAND: 1582 return addrconf_ifid_infiniband(eui, dev); 1583 case ARPHRD_SIT: 1584 return addrconf_ifid_sit(eui, dev); 1585 case ARPHRD_IPGRE: 1586 return addrconf_ifid_gre(eui, dev); 1587 } 1588 return -1; 1589 } 1590 1591 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1592 { 1593 int err = -1; 1594 struct inet6_ifaddr *ifp; 1595 1596 read_lock_bh(&idev->lock); 1597 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1598 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1599 memcpy(eui, ifp->addr.s6_addr+8, 8); 1600 err = 0; 1601 break; 1602 } 1603 } 1604 read_unlock_bh(&idev->lock); 1605 return err; 1606 } 1607 1608 #ifdef CONFIG_IPV6_PRIVACY 1609 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1610 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1611 { 1612 regen: 1613 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1614 idev->rndid[0] &= ~0x02; 1615 1616 /* 1617 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1618 * check if generated address is not inappropriate 1619 * 1620 * - Reserved subnet anycast (RFC 2526) 1621 * 11111101 11....11 1xxxxxxx 1622 * - ISATAP (RFC4214) 6.1 1623 * 00-00-5E-FE-xx-xx-xx-xx 1624 * - value 0 1625 * - XXX: already assigned to an address on the device 1626 */ 1627 if (idev->rndid[0] == 0xfd && 1628 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1629 (idev->rndid[7]&0x80)) 1630 goto regen; 1631 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1632 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1633 goto regen; 1634 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1635 goto regen; 1636 } 1637 1638 return 0; 1639 } 1640 1641 static void ipv6_regen_rndid(unsigned long data) 1642 { 1643 struct inet6_dev *idev = (struct inet6_dev *) data; 1644 unsigned long expires; 1645 1646 rcu_read_lock_bh(); 1647 write_lock_bh(&idev->lock); 1648 1649 if (idev->dead) 1650 goto out; 1651 1652 if (__ipv6_regen_rndid(idev) < 0) 1653 goto out; 1654 1655 expires = jiffies + 1656 idev->cnf.temp_prefered_lft * HZ - 1657 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1658 idev->cnf.max_desync_factor * HZ; 1659 if (time_before(expires, jiffies)) { 1660 printk(KERN_WARNING 1661 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1662 idev->dev->name); 1663 goto out; 1664 } 1665 1666 if (!mod_timer(&idev->regen_timer, expires)) 1667 in6_dev_hold(idev); 1668 1669 out: 1670 write_unlock_bh(&idev->lock); 1671 rcu_read_unlock_bh(); 1672 in6_dev_put(idev); 1673 } 1674 1675 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1676 int ret = 0; 1677 1678 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1679 ret = __ipv6_regen_rndid(idev); 1680 return ret; 1681 } 1682 #endif 1683 1684 /* 1685 * Add prefix route. 1686 */ 1687 1688 static void 1689 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1690 unsigned long expires, u32 flags) 1691 { 1692 struct fib6_config cfg = { 1693 .fc_table = RT6_TABLE_PREFIX, 1694 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1695 .fc_ifindex = dev->ifindex, 1696 .fc_expires = expires, 1697 .fc_dst_len = plen, 1698 .fc_flags = RTF_UP | flags, 1699 .fc_nlinfo.nl_net = dev_net(dev), 1700 .fc_protocol = RTPROT_KERNEL, 1701 }; 1702 1703 ipv6_addr_copy(&cfg.fc_dst, pfx); 1704 1705 /* Prevent useless cloning on PtP SIT. 1706 This thing is done here expecting that the whole 1707 class of non-broadcast devices need not cloning. 1708 */ 1709 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1710 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1711 cfg.fc_flags |= RTF_NONEXTHOP; 1712 #endif 1713 1714 ip6_route_add(&cfg); 1715 } 1716 1717 /* Create "default" multicast route to the interface */ 1718 1719 static void addrconf_add_mroute(struct net_device *dev) 1720 { 1721 struct fib6_config cfg = { 1722 .fc_table = RT6_TABLE_LOCAL, 1723 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1724 .fc_ifindex = dev->ifindex, 1725 .fc_dst_len = 8, 1726 .fc_flags = RTF_UP, 1727 .fc_nlinfo.nl_net = dev_net(dev), 1728 }; 1729 1730 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1731 1732 ip6_route_add(&cfg); 1733 } 1734 1735 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1736 static void sit_route_add(struct net_device *dev) 1737 { 1738 struct fib6_config cfg = { 1739 .fc_table = RT6_TABLE_MAIN, 1740 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1741 .fc_ifindex = dev->ifindex, 1742 .fc_dst_len = 96, 1743 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1744 .fc_nlinfo.nl_net = dev_net(dev), 1745 }; 1746 1747 /* prefix length - 96 bits "::d.d.d.d" */ 1748 ip6_route_add(&cfg); 1749 } 1750 #endif 1751 1752 static void addrconf_add_lroute(struct net_device *dev) 1753 { 1754 struct in6_addr addr; 1755 1756 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1757 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1758 } 1759 1760 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1761 { 1762 struct inet6_dev *idev; 1763 1764 ASSERT_RTNL(); 1765 1766 idev = ipv6_find_idev(dev); 1767 if (!idev) 1768 return ERR_PTR(-ENOBUFS); 1769 1770 if (idev->cnf.disable_ipv6) 1771 return ERR_PTR(-EACCES); 1772 1773 /* Add default multicast route */ 1774 addrconf_add_mroute(dev); 1775 1776 /* Add link local route */ 1777 addrconf_add_lroute(dev); 1778 return idev; 1779 } 1780 1781 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1782 { 1783 struct prefix_info *pinfo; 1784 __u32 valid_lft; 1785 __u32 prefered_lft; 1786 int addr_type; 1787 struct inet6_dev *in6_dev; 1788 struct net *net = dev_net(dev); 1789 1790 pinfo = (struct prefix_info *) opt; 1791 1792 if (len < sizeof(struct prefix_info)) { 1793 ADBG(("addrconf: prefix option too short\n")); 1794 return; 1795 } 1796 1797 /* 1798 * Validation checks ([ADDRCONF], page 19) 1799 */ 1800 1801 addr_type = ipv6_addr_type(&pinfo->prefix); 1802 1803 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1804 return; 1805 1806 valid_lft = ntohl(pinfo->valid); 1807 prefered_lft = ntohl(pinfo->prefered); 1808 1809 if (prefered_lft > valid_lft) { 1810 if (net_ratelimit()) 1811 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1812 return; 1813 } 1814 1815 in6_dev = in6_dev_get(dev); 1816 1817 if (in6_dev == NULL) { 1818 if (net_ratelimit()) 1819 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1820 return; 1821 } 1822 1823 /* 1824 * Two things going on here: 1825 * 1) Add routes for on-link prefixes 1826 * 2) Configure prefixes with the auto flag set 1827 */ 1828 1829 if (pinfo->onlink) { 1830 struct rt6_info *rt; 1831 unsigned long rt_expires; 1832 1833 /* Avoid arithmetic overflow. Really, we could 1834 * save rt_expires in seconds, likely valid_lft, 1835 * but it would require division in fib gc, that it 1836 * not good. 1837 */ 1838 if (HZ > USER_HZ) 1839 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1840 else 1841 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1842 1843 if (addrconf_finite_timeout(rt_expires)) 1844 rt_expires *= HZ; 1845 1846 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1847 dev->ifindex, 1); 1848 1849 if (rt && addrconf_is_prefix_route(rt)) { 1850 /* Autoconf prefix route */ 1851 if (valid_lft == 0) { 1852 ip6_del_rt(rt); 1853 rt = NULL; 1854 } else if (addrconf_finite_timeout(rt_expires)) { 1855 /* not infinity */ 1856 rt->rt6i_expires = jiffies + rt_expires; 1857 rt->rt6i_flags |= RTF_EXPIRES; 1858 } else { 1859 rt->rt6i_flags &= ~RTF_EXPIRES; 1860 rt->rt6i_expires = 0; 1861 } 1862 } else if (valid_lft) { 1863 clock_t expires = 0; 1864 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1865 if (addrconf_finite_timeout(rt_expires)) { 1866 /* not infinity */ 1867 flags |= RTF_EXPIRES; 1868 expires = jiffies_to_clock_t(rt_expires); 1869 } 1870 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1871 dev, expires, flags); 1872 } 1873 if (rt) 1874 dst_release(&rt->dst); 1875 } 1876 1877 /* Try to figure out our local address for this prefix */ 1878 1879 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1880 struct inet6_ifaddr * ifp; 1881 struct in6_addr addr; 1882 int create = 0, update_lft = 0; 1883 1884 if (pinfo->prefix_len == 64) { 1885 memcpy(&addr, &pinfo->prefix, 8); 1886 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1887 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1888 in6_dev_put(in6_dev); 1889 return; 1890 } 1891 goto ok; 1892 } 1893 if (net_ratelimit()) 1894 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1895 pinfo->prefix_len); 1896 in6_dev_put(in6_dev); 1897 return; 1898 1899 ok: 1900 1901 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1902 1903 if (ifp == NULL && valid_lft) { 1904 int max_addresses = in6_dev->cnf.max_addresses; 1905 u32 addr_flags = 0; 1906 1907 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1908 if (in6_dev->cnf.optimistic_dad && 1909 !net->ipv6.devconf_all->forwarding) 1910 addr_flags = IFA_F_OPTIMISTIC; 1911 #endif 1912 1913 /* Do not allow to create too much of autoconfigured 1914 * addresses; this would be too easy way to crash kernel. 1915 */ 1916 if (!max_addresses || 1917 ipv6_count_addresses(in6_dev) < max_addresses) 1918 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1919 addr_type&IPV6_ADDR_SCOPE_MASK, 1920 addr_flags); 1921 1922 if (!ifp || IS_ERR(ifp)) { 1923 in6_dev_put(in6_dev); 1924 return; 1925 } 1926 1927 update_lft = create = 1; 1928 ifp->cstamp = jiffies; 1929 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1930 } 1931 1932 if (ifp) { 1933 int flags; 1934 unsigned long now; 1935 #ifdef CONFIG_IPV6_PRIVACY 1936 struct inet6_ifaddr *ift; 1937 #endif 1938 u32 stored_lft; 1939 1940 /* update lifetime (RFC2462 5.5.3 e) */ 1941 spin_lock(&ifp->lock); 1942 now = jiffies; 1943 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1944 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1945 else 1946 stored_lft = 0; 1947 if (!update_lft && stored_lft) { 1948 if (valid_lft > MIN_VALID_LIFETIME || 1949 valid_lft > stored_lft) 1950 update_lft = 1; 1951 else if (stored_lft <= MIN_VALID_LIFETIME) { 1952 /* valid_lft <= stored_lft is always true */ 1953 /* 1954 * RFC 4862 Section 5.5.3e: 1955 * "Note that the preferred lifetime of 1956 * the corresponding address is always 1957 * reset to the Preferred Lifetime in 1958 * the received Prefix Information 1959 * option, regardless of whether the 1960 * valid lifetime is also reset or 1961 * ignored." 1962 * 1963 * So if the preferred lifetime in 1964 * this advertisement is different 1965 * than what we have stored, but the 1966 * valid lifetime is invalid, just 1967 * reset prefered_lft. 1968 * 1969 * We must set the valid lifetime 1970 * to the stored lifetime since we'll 1971 * be updating the timestamp below, 1972 * else we'll set it back to the 1973 * minimum. 1974 */ 1975 if (prefered_lft != ifp->prefered_lft) { 1976 valid_lft = stored_lft; 1977 update_lft = 1; 1978 } 1979 } else { 1980 valid_lft = MIN_VALID_LIFETIME; 1981 if (valid_lft < prefered_lft) 1982 prefered_lft = valid_lft; 1983 update_lft = 1; 1984 } 1985 } 1986 1987 if (update_lft) { 1988 ifp->valid_lft = valid_lft; 1989 ifp->prefered_lft = prefered_lft; 1990 ifp->tstamp = now; 1991 flags = ifp->flags; 1992 ifp->flags &= ~IFA_F_DEPRECATED; 1993 spin_unlock(&ifp->lock); 1994 1995 if (!(flags&IFA_F_TENTATIVE)) 1996 ipv6_ifa_notify(0, ifp); 1997 } else 1998 spin_unlock(&ifp->lock); 1999 2000 #ifdef CONFIG_IPV6_PRIVACY 2001 read_lock_bh(&in6_dev->lock); 2002 /* update all temporary addresses in the list */ 2003 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2004 tmp_list) { 2005 int age, max_valid, max_prefered; 2006 2007 if (ifp != ift->ifpub) 2008 continue; 2009 2010 /* 2011 * RFC 4941 section 3.3: 2012 * If a received option will extend the lifetime 2013 * of a public address, the lifetimes of 2014 * temporary addresses should be extended, 2015 * subject to the overall constraint that no 2016 * temporary addresses should ever remain 2017 * "valid" or "preferred" for a time longer than 2018 * (TEMP_VALID_LIFETIME) or 2019 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2020 * respectively. 2021 */ 2022 age = (now - ift->cstamp) / HZ; 2023 max_valid = in6_dev->cnf.temp_valid_lft - age; 2024 if (max_valid < 0) 2025 max_valid = 0; 2026 2027 max_prefered = in6_dev->cnf.temp_prefered_lft - 2028 in6_dev->cnf.max_desync_factor - 2029 age; 2030 if (max_prefered < 0) 2031 max_prefered = 0; 2032 2033 if (valid_lft > max_valid) 2034 valid_lft = max_valid; 2035 2036 if (prefered_lft > max_prefered) 2037 prefered_lft = max_prefered; 2038 2039 spin_lock(&ift->lock); 2040 flags = ift->flags; 2041 ift->valid_lft = valid_lft; 2042 ift->prefered_lft = prefered_lft; 2043 ift->tstamp = now; 2044 if (prefered_lft > 0) 2045 ift->flags &= ~IFA_F_DEPRECATED; 2046 2047 spin_unlock(&ift->lock); 2048 if (!(flags&IFA_F_TENTATIVE)) 2049 ipv6_ifa_notify(0, ift); 2050 } 2051 2052 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2053 /* 2054 * When a new public address is created as 2055 * described in [ADDRCONF], also create a new 2056 * temporary address. Also create a temporary 2057 * address if it's enabled but no temporary 2058 * address currently exists. 2059 */ 2060 read_unlock_bh(&in6_dev->lock); 2061 ipv6_create_tempaddr(ifp, NULL); 2062 } else { 2063 read_unlock_bh(&in6_dev->lock); 2064 } 2065 #endif 2066 in6_ifa_put(ifp); 2067 addrconf_verify(0); 2068 } 2069 } 2070 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2071 in6_dev_put(in6_dev); 2072 } 2073 2074 /* 2075 * Set destination address. 2076 * Special case for SIT interfaces where we create a new "virtual" 2077 * device. 2078 */ 2079 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2080 { 2081 struct in6_ifreq ireq; 2082 struct net_device *dev; 2083 int err = -EINVAL; 2084 2085 rtnl_lock(); 2086 2087 err = -EFAULT; 2088 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2089 goto err_exit; 2090 2091 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2092 2093 err = -ENODEV; 2094 if (dev == NULL) 2095 goto err_exit; 2096 2097 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2098 if (dev->type == ARPHRD_SIT) { 2099 const struct net_device_ops *ops = dev->netdev_ops; 2100 struct ifreq ifr; 2101 struct ip_tunnel_parm p; 2102 2103 err = -EADDRNOTAVAIL; 2104 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2105 goto err_exit; 2106 2107 memset(&p, 0, sizeof(p)); 2108 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2109 p.iph.saddr = 0; 2110 p.iph.version = 4; 2111 p.iph.ihl = 5; 2112 p.iph.protocol = IPPROTO_IPV6; 2113 p.iph.ttl = 64; 2114 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2115 2116 if (ops->ndo_do_ioctl) { 2117 mm_segment_t oldfs = get_fs(); 2118 2119 set_fs(KERNEL_DS); 2120 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2121 set_fs(oldfs); 2122 } else 2123 err = -EOPNOTSUPP; 2124 2125 if (err == 0) { 2126 err = -ENOBUFS; 2127 dev = __dev_get_by_name(net, p.name); 2128 if (!dev) 2129 goto err_exit; 2130 err = dev_open(dev); 2131 } 2132 } 2133 #endif 2134 2135 err_exit: 2136 rtnl_unlock(); 2137 return err; 2138 } 2139 2140 /* 2141 * Manual configuration of address on an interface 2142 */ 2143 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2144 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2145 __u32 valid_lft) 2146 { 2147 struct inet6_ifaddr *ifp; 2148 struct inet6_dev *idev; 2149 struct net_device *dev; 2150 int scope; 2151 u32 flags; 2152 clock_t expires; 2153 unsigned long timeout; 2154 2155 ASSERT_RTNL(); 2156 2157 if (plen > 128) 2158 return -EINVAL; 2159 2160 /* check the lifetime */ 2161 if (!valid_lft || prefered_lft > valid_lft) 2162 return -EINVAL; 2163 2164 dev = __dev_get_by_index(net, ifindex); 2165 if (!dev) 2166 return -ENODEV; 2167 2168 idev = addrconf_add_dev(dev); 2169 if (IS_ERR(idev)) 2170 return PTR_ERR(idev); 2171 2172 scope = ipv6_addr_scope(pfx); 2173 2174 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2175 if (addrconf_finite_timeout(timeout)) { 2176 expires = jiffies_to_clock_t(timeout * HZ); 2177 valid_lft = timeout; 2178 flags = RTF_EXPIRES; 2179 } else { 2180 expires = 0; 2181 flags = 0; 2182 ifa_flags |= IFA_F_PERMANENT; 2183 } 2184 2185 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2186 if (addrconf_finite_timeout(timeout)) { 2187 if (timeout == 0) 2188 ifa_flags |= IFA_F_DEPRECATED; 2189 prefered_lft = timeout; 2190 } 2191 2192 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2193 2194 if (!IS_ERR(ifp)) { 2195 spin_lock_bh(&ifp->lock); 2196 ifp->valid_lft = valid_lft; 2197 ifp->prefered_lft = prefered_lft; 2198 ifp->tstamp = jiffies; 2199 spin_unlock_bh(&ifp->lock); 2200 2201 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2202 expires, flags); 2203 /* 2204 * Note that section 3.1 of RFC 4429 indicates 2205 * that the Optimistic flag should not be set for 2206 * manually configured addresses 2207 */ 2208 addrconf_dad_start(ifp, 0); 2209 in6_ifa_put(ifp); 2210 addrconf_verify(0); 2211 return 0; 2212 } 2213 2214 return PTR_ERR(ifp); 2215 } 2216 2217 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2218 unsigned int plen) 2219 { 2220 struct inet6_ifaddr *ifp; 2221 struct inet6_dev *idev; 2222 struct net_device *dev; 2223 2224 if (plen > 128) 2225 return -EINVAL; 2226 2227 dev = __dev_get_by_index(net, ifindex); 2228 if (!dev) 2229 return -ENODEV; 2230 2231 if ((idev = __in6_dev_get(dev)) == NULL) 2232 return -ENXIO; 2233 2234 read_lock_bh(&idev->lock); 2235 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2236 if (ifp->prefix_len == plen && 2237 ipv6_addr_equal(pfx, &ifp->addr)) { 2238 in6_ifa_hold(ifp); 2239 read_unlock_bh(&idev->lock); 2240 2241 ipv6_del_addr(ifp); 2242 2243 /* If the last address is deleted administratively, 2244 disable IPv6 on this interface. 2245 */ 2246 if (list_empty(&idev->addr_list)) 2247 addrconf_ifdown(idev->dev, 1); 2248 return 0; 2249 } 2250 } 2251 read_unlock_bh(&idev->lock); 2252 return -EADDRNOTAVAIL; 2253 } 2254 2255 2256 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2257 { 2258 struct in6_ifreq ireq; 2259 int err; 2260 2261 if (!capable(CAP_NET_ADMIN)) 2262 return -EPERM; 2263 2264 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2265 return -EFAULT; 2266 2267 rtnl_lock(); 2268 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2269 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2270 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2271 rtnl_unlock(); 2272 return err; 2273 } 2274 2275 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2276 { 2277 struct in6_ifreq ireq; 2278 int err; 2279 2280 if (!capable(CAP_NET_ADMIN)) 2281 return -EPERM; 2282 2283 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2284 return -EFAULT; 2285 2286 rtnl_lock(); 2287 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2288 ireq.ifr6_prefixlen); 2289 rtnl_unlock(); 2290 return err; 2291 } 2292 2293 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2294 int plen, int scope) 2295 { 2296 struct inet6_ifaddr *ifp; 2297 2298 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2299 if (!IS_ERR(ifp)) { 2300 spin_lock_bh(&ifp->lock); 2301 ifp->flags &= ~IFA_F_TENTATIVE; 2302 spin_unlock_bh(&ifp->lock); 2303 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2304 in6_ifa_put(ifp); 2305 } 2306 } 2307 2308 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2309 static void sit_add_v4_addrs(struct inet6_dev *idev) 2310 { 2311 struct in6_addr addr; 2312 struct net_device *dev; 2313 struct net *net = dev_net(idev->dev); 2314 int scope; 2315 2316 ASSERT_RTNL(); 2317 2318 memset(&addr, 0, sizeof(struct in6_addr)); 2319 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2320 2321 if (idev->dev->flags&IFF_POINTOPOINT) { 2322 addr.s6_addr32[0] = htonl(0xfe800000); 2323 scope = IFA_LINK; 2324 } else { 2325 scope = IPV6_ADDR_COMPATv4; 2326 } 2327 2328 if (addr.s6_addr32[3]) { 2329 add_addr(idev, &addr, 128, scope); 2330 return; 2331 } 2332 2333 for_each_netdev(net, dev) { 2334 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2335 if (in_dev && (dev->flags & IFF_UP)) { 2336 struct in_ifaddr * ifa; 2337 2338 int flag = scope; 2339 2340 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2341 int plen; 2342 2343 addr.s6_addr32[3] = ifa->ifa_local; 2344 2345 if (ifa->ifa_scope == RT_SCOPE_LINK) 2346 continue; 2347 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2348 if (idev->dev->flags&IFF_POINTOPOINT) 2349 continue; 2350 flag |= IFA_HOST; 2351 } 2352 if (idev->dev->flags&IFF_POINTOPOINT) 2353 plen = 64; 2354 else 2355 plen = 96; 2356 2357 add_addr(idev, &addr, plen, flag); 2358 } 2359 } 2360 } 2361 } 2362 #endif 2363 2364 static void init_loopback(struct net_device *dev) 2365 { 2366 struct inet6_dev *idev; 2367 2368 /* ::1 */ 2369 2370 ASSERT_RTNL(); 2371 2372 if ((idev = ipv6_find_idev(dev)) == NULL) { 2373 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2374 return; 2375 } 2376 2377 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2378 } 2379 2380 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2381 { 2382 struct inet6_ifaddr * ifp; 2383 u32 addr_flags = IFA_F_PERMANENT; 2384 2385 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2386 if (idev->cnf.optimistic_dad && 2387 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2388 addr_flags |= IFA_F_OPTIMISTIC; 2389 #endif 2390 2391 2392 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2393 if (!IS_ERR(ifp)) { 2394 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2395 addrconf_dad_start(ifp, 0); 2396 in6_ifa_put(ifp); 2397 } 2398 } 2399 2400 static void addrconf_dev_config(struct net_device *dev) 2401 { 2402 struct in6_addr addr; 2403 struct inet6_dev * idev; 2404 2405 ASSERT_RTNL(); 2406 2407 if ((dev->type != ARPHRD_ETHER) && 2408 (dev->type != ARPHRD_FDDI) && 2409 (dev->type != ARPHRD_IEEE802_TR) && 2410 (dev->type != ARPHRD_ARCNET) && 2411 (dev->type != ARPHRD_INFINIBAND)) { 2412 /* Alas, we support only Ethernet autoconfiguration. */ 2413 return; 2414 } 2415 2416 idev = addrconf_add_dev(dev); 2417 if (IS_ERR(idev)) 2418 return; 2419 2420 memset(&addr, 0, sizeof(struct in6_addr)); 2421 addr.s6_addr32[0] = htonl(0xFE800000); 2422 2423 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2424 addrconf_add_linklocal(idev, &addr); 2425 } 2426 2427 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2428 static void addrconf_sit_config(struct net_device *dev) 2429 { 2430 struct inet6_dev *idev; 2431 2432 ASSERT_RTNL(); 2433 2434 /* 2435 * Configure the tunnel with one of our IPv4 2436 * addresses... we should configure all of 2437 * our v4 addrs in the tunnel 2438 */ 2439 2440 if ((idev = ipv6_find_idev(dev)) == NULL) { 2441 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2442 return; 2443 } 2444 2445 if (dev->priv_flags & IFF_ISATAP) { 2446 struct in6_addr addr; 2447 2448 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2449 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2450 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2451 addrconf_add_linklocal(idev, &addr); 2452 return; 2453 } 2454 2455 sit_add_v4_addrs(idev); 2456 2457 if (dev->flags&IFF_POINTOPOINT) { 2458 addrconf_add_mroute(dev); 2459 addrconf_add_lroute(dev); 2460 } else 2461 sit_route_add(dev); 2462 } 2463 #endif 2464 2465 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2466 static void addrconf_gre_config(struct net_device *dev) 2467 { 2468 struct inet6_dev *idev; 2469 struct in6_addr addr; 2470 2471 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name); 2472 2473 ASSERT_RTNL(); 2474 2475 if ((idev = ipv6_find_idev(dev)) == NULL) { 2476 printk(KERN_DEBUG "init gre: add_dev failed\n"); 2477 return; 2478 } 2479 2480 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2481 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2482 2483 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2484 addrconf_add_linklocal(idev, &addr); 2485 } 2486 #endif 2487 2488 static inline int 2489 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2490 { 2491 struct in6_addr lladdr; 2492 2493 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2494 addrconf_add_linklocal(idev, &lladdr); 2495 return 0; 2496 } 2497 return -1; 2498 } 2499 2500 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2501 { 2502 struct net_device *link_dev; 2503 struct net *net = dev_net(idev->dev); 2504 2505 /* first try to inherit the link-local address from the link device */ 2506 if (idev->dev->iflink && 2507 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2508 if (!ipv6_inherit_linklocal(idev, link_dev)) 2509 return; 2510 } 2511 /* then try to inherit it from any device */ 2512 for_each_netdev(net, link_dev) { 2513 if (!ipv6_inherit_linklocal(idev, link_dev)) 2514 return; 2515 } 2516 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2517 } 2518 2519 /* 2520 * Autoconfigure tunnel with a link-local address so routing protocols, 2521 * DHCPv6, MLD etc. can be run over the virtual link 2522 */ 2523 2524 static void addrconf_ip6_tnl_config(struct net_device *dev) 2525 { 2526 struct inet6_dev *idev; 2527 2528 ASSERT_RTNL(); 2529 2530 idev = addrconf_add_dev(dev); 2531 if (IS_ERR(idev)) { 2532 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2533 return; 2534 } 2535 ip6_tnl_add_linklocal(idev); 2536 } 2537 2538 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2539 void * data) 2540 { 2541 struct net_device *dev = (struct net_device *) data; 2542 struct inet6_dev *idev = __in6_dev_get(dev); 2543 int run_pending = 0; 2544 int err; 2545 2546 switch (event) { 2547 case NETDEV_REGISTER: 2548 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2549 idev = ipv6_add_dev(dev); 2550 if (!idev) 2551 return notifier_from_errno(-ENOMEM); 2552 } 2553 break; 2554 2555 case NETDEV_UP: 2556 case NETDEV_CHANGE: 2557 if (dev->flags & IFF_SLAVE) 2558 break; 2559 2560 if (event == NETDEV_UP) { 2561 if (!addrconf_qdisc_ok(dev)) { 2562 /* device is not ready yet. */ 2563 printk(KERN_INFO 2564 "ADDRCONF(NETDEV_UP): %s: " 2565 "link is not ready\n", 2566 dev->name); 2567 break; 2568 } 2569 2570 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2571 idev = ipv6_add_dev(dev); 2572 2573 if (idev) { 2574 idev->if_flags |= IF_READY; 2575 run_pending = 1; 2576 } 2577 } else { 2578 if (!addrconf_qdisc_ok(dev)) { 2579 /* device is still not ready. */ 2580 break; 2581 } 2582 2583 if (idev) { 2584 if (idev->if_flags & IF_READY) 2585 /* device is already configured. */ 2586 break; 2587 idev->if_flags |= IF_READY; 2588 } 2589 2590 printk(KERN_INFO 2591 "ADDRCONF(NETDEV_CHANGE): %s: " 2592 "link becomes ready\n", 2593 dev->name); 2594 2595 run_pending = 1; 2596 } 2597 2598 switch (dev->type) { 2599 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2600 case ARPHRD_SIT: 2601 addrconf_sit_config(dev); 2602 break; 2603 #endif 2604 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2605 case ARPHRD_IPGRE: 2606 addrconf_gre_config(dev); 2607 break; 2608 #endif 2609 case ARPHRD_TUNNEL6: 2610 addrconf_ip6_tnl_config(dev); 2611 break; 2612 case ARPHRD_LOOPBACK: 2613 init_loopback(dev); 2614 break; 2615 2616 default: 2617 addrconf_dev_config(dev); 2618 break; 2619 } 2620 2621 if (idev) { 2622 if (run_pending) 2623 addrconf_dad_run(idev); 2624 2625 /* 2626 * If the MTU changed during the interface down, 2627 * when the interface up, the changed MTU must be 2628 * reflected in the idev as well as routers. 2629 */ 2630 if (idev->cnf.mtu6 != dev->mtu && 2631 dev->mtu >= IPV6_MIN_MTU) { 2632 rt6_mtu_change(dev, dev->mtu); 2633 idev->cnf.mtu6 = dev->mtu; 2634 } 2635 idev->tstamp = jiffies; 2636 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2637 2638 /* 2639 * If the changed mtu during down is lower than 2640 * IPV6_MIN_MTU stop IPv6 on this interface. 2641 */ 2642 if (dev->mtu < IPV6_MIN_MTU) 2643 addrconf_ifdown(dev, 1); 2644 } 2645 break; 2646 2647 case NETDEV_CHANGEMTU: 2648 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2649 rt6_mtu_change(dev, dev->mtu); 2650 idev->cnf.mtu6 = dev->mtu; 2651 break; 2652 } 2653 2654 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2655 idev = ipv6_add_dev(dev); 2656 if (idev) 2657 break; 2658 } 2659 2660 /* 2661 * MTU falled under IPV6_MIN_MTU. 2662 * Stop IPv6 on this interface. 2663 */ 2664 2665 case NETDEV_DOWN: 2666 case NETDEV_UNREGISTER: 2667 /* 2668 * Remove all addresses from this interface. 2669 */ 2670 addrconf_ifdown(dev, event != NETDEV_DOWN); 2671 break; 2672 2673 case NETDEV_CHANGENAME: 2674 if (idev) { 2675 snmp6_unregister_dev(idev); 2676 addrconf_sysctl_unregister(idev); 2677 addrconf_sysctl_register(idev); 2678 err = snmp6_register_dev(idev); 2679 if (err) 2680 return notifier_from_errno(err); 2681 } 2682 break; 2683 2684 case NETDEV_PRE_TYPE_CHANGE: 2685 case NETDEV_POST_TYPE_CHANGE: 2686 addrconf_type_change(dev, event); 2687 break; 2688 } 2689 2690 return NOTIFY_OK; 2691 } 2692 2693 /* 2694 * addrconf module should be notified of a device going up 2695 */ 2696 static struct notifier_block ipv6_dev_notf = { 2697 .notifier_call = addrconf_notify, 2698 }; 2699 2700 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2701 { 2702 struct inet6_dev *idev; 2703 ASSERT_RTNL(); 2704 2705 idev = __in6_dev_get(dev); 2706 2707 if (event == NETDEV_POST_TYPE_CHANGE) 2708 ipv6_mc_remap(idev); 2709 else if (event == NETDEV_PRE_TYPE_CHANGE) 2710 ipv6_mc_unmap(idev); 2711 } 2712 2713 static int addrconf_ifdown(struct net_device *dev, int how) 2714 { 2715 struct net *net = dev_net(dev); 2716 struct inet6_dev *idev; 2717 struct inet6_ifaddr *ifa; 2718 int state, i; 2719 2720 ASSERT_RTNL(); 2721 2722 rt6_ifdown(net, dev); 2723 neigh_ifdown(&nd_tbl, dev); 2724 2725 idev = __in6_dev_get(dev); 2726 if (idev == NULL) 2727 return -ENODEV; 2728 2729 /* 2730 * Step 1: remove reference to ipv6 device from parent device. 2731 * Do not dev_put! 2732 */ 2733 if (how) { 2734 idev->dead = 1; 2735 2736 /* protected by rtnl_lock */ 2737 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2738 2739 /* Step 1.5: remove snmp6 entry */ 2740 snmp6_unregister_dev(idev); 2741 2742 } 2743 2744 /* Step 2: clear hash table */ 2745 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2746 struct hlist_head *h = &inet6_addr_lst[i]; 2747 struct hlist_node *n; 2748 2749 spin_lock_bh(&addrconf_hash_lock); 2750 restart: 2751 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2752 if (ifa->idev == idev) { 2753 hlist_del_init_rcu(&ifa->addr_lst); 2754 addrconf_del_timer(ifa); 2755 goto restart; 2756 } 2757 } 2758 spin_unlock_bh(&addrconf_hash_lock); 2759 } 2760 2761 write_lock_bh(&idev->lock); 2762 2763 /* Step 2: clear flags for stateless addrconf */ 2764 if (!how) 2765 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2766 2767 #ifdef CONFIG_IPV6_PRIVACY 2768 if (how && del_timer(&idev->regen_timer)) 2769 in6_dev_put(idev); 2770 2771 /* Step 3: clear tempaddr list */ 2772 while (!list_empty(&idev->tempaddr_list)) { 2773 ifa = list_first_entry(&idev->tempaddr_list, 2774 struct inet6_ifaddr, tmp_list); 2775 list_del(&ifa->tmp_list); 2776 write_unlock_bh(&idev->lock); 2777 spin_lock_bh(&ifa->lock); 2778 2779 if (ifa->ifpub) { 2780 in6_ifa_put(ifa->ifpub); 2781 ifa->ifpub = NULL; 2782 } 2783 spin_unlock_bh(&ifa->lock); 2784 in6_ifa_put(ifa); 2785 write_lock_bh(&idev->lock); 2786 } 2787 #endif 2788 2789 while (!list_empty(&idev->addr_list)) { 2790 ifa = list_first_entry(&idev->addr_list, 2791 struct inet6_ifaddr, if_list); 2792 addrconf_del_timer(ifa); 2793 2794 list_del(&ifa->if_list); 2795 2796 write_unlock_bh(&idev->lock); 2797 2798 spin_lock_bh(&ifa->state_lock); 2799 state = ifa->state; 2800 ifa->state = INET6_IFADDR_STATE_DEAD; 2801 spin_unlock_bh(&ifa->state_lock); 2802 2803 if (state != INET6_IFADDR_STATE_DEAD) { 2804 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2805 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2806 } 2807 in6_ifa_put(ifa); 2808 2809 write_lock_bh(&idev->lock); 2810 } 2811 2812 write_unlock_bh(&idev->lock); 2813 2814 /* Step 5: Discard multicast list */ 2815 if (how) 2816 ipv6_mc_destroy_dev(idev); 2817 else 2818 ipv6_mc_down(idev); 2819 2820 idev->tstamp = jiffies; 2821 2822 /* Last: Shot the device (if unregistered) */ 2823 if (how) { 2824 addrconf_sysctl_unregister(idev); 2825 neigh_parms_release(&nd_tbl, idev->nd_parms); 2826 neigh_ifdown(&nd_tbl, dev); 2827 in6_dev_put(idev); 2828 } 2829 return 0; 2830 } 2831 2832 static void addrconf_rs_timer(unsigned long data) 2833 { 2834 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2835 struct inet6_dev *idev = ifp->idev; 2836 2837 read_lock(&idev->lock); 2838 if (idev->dead || !(idev->if_flags & IF_READY)) 2839 goto out; 2840 2841 if (idev->cnf.forwarding) 2842 goto out; 2843 2844 /* Announcement received after solicitation was sent */ 2845 if (idev->if_flags & IF_RA_RCVD) 2846 goto out; 2847 2848 spin_lock(&ifp->lock); 2849 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2850 /* The wait after the last probe can be shorter */ 2851 addrconf_mod_timer(ifp, AC_RS, 2852 (ifp->probes == idev->cnf.rtr_solicits) ? 2853 idev->cnf.rtr_solicit_delay : 2854 idev->cnf.rtr_solicit_interval); 2855 spin_unlock(&ifp->lock); 2856 2857 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2858 } else { 2859 spin_unlock(&ifp->lock); 2860 /* 2861 * Note: we do not support deprecated "all on-link" 2862 * assumption any longer. 2863 */ 2864 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2865 idev->dev->name); 2866 } 2867 2868 out: 2869 read_unlock(&idev->lock); 2870 in6_ifa_put(ifp); 2871 } 2872 2873 /* 2874 * Duplicate Address Detection 2875 */ 2876 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2877 { 2878 unsigned long rand_num; 2879 struct inet6_dev *idev = ifp->idev; 2880 2881 if (ifp->flags & IFA_F_OPTIMISTIC) 2882 rand_num = 0; 2883 else 2884 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2885 2886 ifp->probes = idev->cnf.dad_transmits; 2887 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2888 } 2889 2890 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2891 { 2892 struct inet6_dev *idev = ifp->idev; 2893 struct net_device *dev = idev->dev; 2894 2895 addrconf_join_solict(dev, &ifp->addr); 2896 2897 net_srandom(ifp->addr.s6_addr32[3]); 2898 2899 read_lock_bh(&idev->lock); 2900 spin_lock(&ifp->lock); 2901 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2902 goto out; 2903 2904 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2905 idev->cnf.accept_dad < 1 || 2906 !(ifp->flags&IFA_F_TENTATIVE) || 2907 ifp->flags & IFA_F_NODAD) { 2908 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2909 spin_unlock(&ifp->lock); 2910 read_unlock_bh(&idev->lock); 2911 2912 addrconf_dad_completed(ifp); 2913 return; 2914 } 2915 2916 if (!(idev->if_flags & IF_READY)) { 2917 spin_unlock(&ifp->lock); 2918 read_unlock_bh(&idev->lock); 2919 /* 2920 * If the device is not ready: 2921 * - keep it tentative if it is a permanent address. 2922 * - otherwise, kill it. 2923 */ 2924 in6_ifa_hold(ifp); 2925 addrconf_dad_stop(ifp, 0); 2926 return; 2927 } 2928 2929 /* 2930 * Optimistic nodes can start receiving 2931 * Frames right away 2932 */ 2933 if (ifp->flags & IFA_F_OPTIMISTIC) 2934 ip6_ins_rt(ifp->rt); 2935 2936 addrconf_dad_kick(ifp); 2937 out: 2938 spin_unlock(&ifp->lock); 2939 read_unlock_bh(&idev->lock); 2940 } 2941 2942 static void addrconf_dad_timer(unsigned long data) 2943 { 2944 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2945 struct inet6_dev *idev = ifp->idev; 2946 struct in6_addr mcaddr; 2947 2948 if (!ifp->probes && addrconf_dad_end(ifp)) 2949 goto out; 2950 2951 read_lock(&idev->lock); 2952 if (idev->dead || !(idev->if_flags & IF_READY)) { 2953 read_unlock(&idev->lock); 2954 goto out; 2955 } 2956 2957 spin_lock(&ifp->lock); 2958 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2959 spin_unlock(&ifp->lock); 2960 read_unlock(&idev->lock); 2961 goto out; 2962 } 2963 2964 if (ifp->probes == 0) { 2965 /* 2966 * DAD was successful 2967 */ 2968 2969 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2970 spin_unlock(&ifp->lock); 2971 read_unlock(&idev->lock); 2972 2973 addrconf_dad_completed(ifp); 2974 2975 goto out; 2976 } 2977 2978 ifp->probes--; 2979 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2980 spin_unlock(&ifp->lock); 2981 read_unlock(&idev->lock); 2982 2983 /* send a neighbour solicitation for our addr */ 2984 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2985 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2986 out: 2987 in6_ifa_put(ifp); 2988 } 2989 2990 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2991 { 2992 struct net_device *dev = ifp->idev->dev; 2993 2994 /* 2995 * Configure the address for reception. Now it is valid. 2996 */ 2997 2998 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2999 3000 /* If added prefix is link local and we are prepared to process 3001 router advertisements, start sending router solicitations. 3002 */ 3003 3004 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) || 3005 ifp->idev->cnf.accept_ra == 2) && 3006 ifp->idev->cnf.rtr_solicits > 0 && 3007 (dev->flags&IFF_LOOPBACK) == 0 && 3008 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3009 /* 3010 * If a host as already performed a random delay 3011 * [...] as part of DAD [...] there is no need 3012 * to delay again before sending the first RS 3013 */ 3014 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3015 3016 spin_lock_bh(&ifp->lock); 3017 ifp->probes = 1; 3018 ifp->idev->if_flags |= IF_RS_SENT; 3019 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3020 spin_unlock_bh(&ifp->lock); 3021 } 3022 } 3023 3024 static void addrconf_dad_run(struct inet6_dev *idev) 3025 { 3026 struct inet6_ifaddr *ifp; 3027 3028 read_lock_bh(&idev->lock); 3029 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3030 spin_lock(&ifp->lock); 3031 if (ifp->flags & IFA_F_TENTATIVE && 3032 ifp->state == INET6_IFADDR_STATE_DAD) 3033 addrconf_dad_kick(ifp); 3034 spin_unlock(&ifp->lock); 3035 } 3036 read_unlock_bh(&idev->lock); 3037 } 3038 3039 #ifdef CONFIG_PROC_FS 3040 struct if6_iter_state { 3041 struct seq_net_private p; 3042 int bucket; 3043 }; 3044 3045 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 3046 { 3047 struct inet6_ifaddr *ifa = NULL; 3048 struct if6_iter_state *state = seq->private; 3049 struct net *net = seq_file_net(seq); 3050 3051 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3052 struct hlist_node *n; 3053 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3054 addr_lst) 3055 if (net_eq(dev_net(ifa->idev->dev), net)) 3056 return ifa; 3057 } 3058 return NULL; 3059 } 3060 3061 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3062 struct inet6_ifaddr *ifa) 3063 { 3064 struct if6_iter_state *state = seq->private; 3065 struct net *net = seq_file_net(seq); 3066 struct hlist_node *n = &ifa->addr_lst; 3067 3068 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) 3069 if (net_eq(dev_net(ifa->idev->dev), net)) 3070 return ifa; 3071 3072 while (++state->bucket < IN6_ADDR_HSIZE) { 3073 hlist_for_each_entry_rcu_bh(ifa, n, 3074 &inet6_addr_lst[state->bucket], addr_lst) { 3075 if (net_eq(dev_net(ifa->idev->dev), net)) 3076 return ifa; 3077 } 3078 } 3079 3080 return NULL; 3081 } 3082 3083 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3084 { 3085 struct inet6_ifaddr *ifa = if6_get_first(seq); 3086 3087 if (ifa) 3088 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3089 --pos; 3090 return pos ? NULL : ifa; 3091 } 3092 3093 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3094 __acquires(rcu_bh) 3095 { 3096 rcu_read_lock_bh(); 3097 return if6_get_idx(seq, *pos); 3098 } 3099 3100 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3101 { 3102 struct inet6_ifaddr *ifa; 3103 3104 ifa = if6_get_next(seq, v); 3105 ++*pos; 3106 return ifa; 3107 } 3108 3109 static void if6_seq_stop(struct seq_file *seq, void *v) 3110 __releases(rcu_bh) 3111 { 3112 rcu_read_unlock_bh(); 3113 } 3114 3115 static int if6_seq_show(struct seq_file *seq, void *v) 3116 { 3117 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3118 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3119 &ifp->addr, 3120 ifp->idev->dev->ifindex, 3121 ifp->prefix_len, 3122 ifp->scope, 3123 ifp->flags, 3124 ifp->idev->dev->name); 3125 return 0; 3126 } 3127 3128 static const struct seq_operations if6_seq_ops = { 3129 .start = if6_seq_start, 3130 .next = if6_seq_next, 3131 .show = if6_seq_show, 3132 .stop = if6_seq_stop, 3133 }; 3134 3135 static int if6_seq_open(struct inode *inode, struct file *file) 3136 { 3137 return seq_open_net(inode, file, &if6_seq_ops, 3138 sizeof(struct if6_iter_state)); 3139 } 3140 3141 static const struct file_operations if6_fops = { 3142 .owner = THIS_MODULE, 3143 .open = if6_seq_open, 3144 .read = seq_read, 3145 .llseek = seq_lseek, 3146 .release = seq_release_net, 3147 }; 3148 3149 static int __net_init if6_proc_net_init(struct net *net) 3150 { 3151 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3152 return -ENOMEM; 3153 return 0; 3154 } 3155 3156 static void __net_exit if6_proc_net_exit(struct net *net) 3157 { 3158 proc_net_remove(net, "if_inet6"); 3159 } 3160 3161 static struct pernet_operations if6_proc_net_ops = { 3162 .init = if6_proc_net_init, 3163 .exit = if6_proc_net_exit, 3164 }; 3165 3166 int __init if6_proc_init(void) 3167 { 3168 return register_pernet_subsys(&if6_proc_net_ops); 3169 } 3170 3171 void if6_proc_exit(void) 3172 { 3173 unregister_pernet_subsys(&if6_proc_net_ops); 3174 } 3175 #endif /* CONFIG_PROC_FS */ 3176 3177 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3178 /* Check if address is a home address configured on any interface. */ 3179 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3180 { 3181 int ret = 0; 3182 struct inet6_ifaddr *ifp = NULL; 3183 struct hlist_node *n; 3184 unsigned int hash = ipv6_addr_hash(addr); 3185 3186 rcu_read_lock_bh(); 3187 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3188 if (!net_eq(dev_net(ifp->idev->dev), net)) 3189 continue; 3190 if (ipv6_addr_equal(&ifp->addr, addr) && 3191 (ifp->flags & IFA_F_HOMEADDRESS)) { 3192 ret = 1; 3193 break; 3194 } 3195 } 3196 rcu_read_unlock_bh(); 3197 return ret; 3198 } 3199 #endif 3200 3201 /* 3202 * Periodic address status verification 3203 */ 3204 3205 static void addrconf_verify(unsigned long foo) 3206 { 3207 unsigned long now, next, next_sec, next_sched; 3208 struct inet6_ifaddr *ifp; 3209 struct hlist_node *node; 3210 int i; 3211 3212 rcu_read_lock_bh(); 3213 spin_lock(&addrconf_verify_lock); 3214 now = jiffies; 3215 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3216 3217 del_timer(&addr_chk_timer); 3218 3219 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3220 restart: 3221 hlist_for_each_entry_rcu_bh(ifp, node, 3222 &inet6_addr_lst[i], addr_lst) { 3223 unsigned long age; 3224 3225 if (ifp->flags & IFA_F_PERMANENT) 3226 continue; 3227 3228 spin_lock(&ifp->lock); 3229 /* We try to batch several events at once. */ 3230 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3231 3232 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3233 age >= ifp->valid_lft) { 3234 spin_unlock(&ifp->lock); 3235 in6_ifa_hold(ifp); 3236 ipv6_del_addr(ifp); 3237 goto restart; 3238 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3239 spin_unlock(&ifp->lock); 3240 continue; 3241 } else if (age >= ifp->prefered_lft) { 3242 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3243 int deprecate = 0; 3244 3245 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3246 deprecate = 1; 3247 ifp->flags |= IFA_F_DEPRECATED; 3248 } 3249 3250 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3251 next = ifp->tstamp + ifp->valid_lft * HZ; 3252 3253 spin_unlock(&ifp->lock); 3254 3255 if (deprecate) { 3256 in6_ifa_hold(ifp); 3257 3258 ipv6_ifa_notify(0, ifp); 3259 in6_ifa_put(ifp); 3260 goto restart; 3261 } 3262 #ifdef CONFIG_IPV6_PRIVACY 3263 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3264 !(ifp->flags&IFA_F_TENTATIVE)) { 3265 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3266 ifp->idev->cnf.dad_transmits * 3267 ifp->idev->nd_parms->retrans_time / HZ; 3268 3269 if (age >= ifp->prefered_lft - regen_advance) { 3270 struct inet6_ifaddr *ifpub = ifp->ifpub; 3271 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3272 next = ifp->tstamp + ifp->prefered_lft * HZ; 3273 if (!ifp->regen_count && ifpub) { 3274 ifp->regen_count++; 3275 in6_ifa_hold(ifp); 3276 in6_ifa_hold(ifpub); 3277 spin_unlock(&ifp->lock); 3278 3279 spin_lock(&ifpub->lock); 3280 ifpub->regen_count = 0; 3281 spin_unlock(&ifpub->lock); 3282 ipv6_create_tempaddr(ifpub, ifp); 3283 in6_ifa_put(ifpub); 3284 in6_ifa_put(ifp); 3285 goto restart; 3286 } 3287 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3288 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3289 spin_unlock(&ifp->lock); 3290 #endif 3291 } else { 3292 /* ifp->prefered_lft <= ifp->valid_lft */ 3293 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3294 next = ifp->tstamp + ifp->prefered_lft * HZ; 3295 spin_unlock(&ifp->lock); 3296 } 3297 } 3298 } 3299 3300 next_sec = round_jiffies_up(next); 3301 next_sched = next; 3302 3303 /* If rounded timeout is accurate enough, accept it. */ 3304 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3305 next_sched = next_sec; 3306 3307 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3308 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3309 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3310 3311 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3312 now, next, next_sec, next_sched)); 3313 3314 addr_chk_timer.expires = next_sched; 3315 add_timer(&addr_chk_timer); 3316 spin_unlock(&addrconf_verify_lock); 3317 rcu_read_unlock_bh(); 3318 } 3319 3320 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3321 { 3322 struct in6_addr *pfx = NULL; 3323 3324 if (addr) 3325 pfx = nla_data(addr); 3326 3327 if (local) { 3328 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3329 pfx = NULL; 3330 else 3331 pfx = nla_data(local); 3332 } 3333 3334 return pfx; 3335 } 3336 3337 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3338 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3339 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3340 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3341 }; 3342 3343 static int 3344 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3345 { 3346 struct net *net = sock_net(skb->sk); 3347 struct ifaddrmsg *ifm; 3348 struct nlattr *tb[IFA_MAX+1]; 3349 struct in6_addr *pfx; 3350 int err; 3351 3352 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3353 if (err < 0) 3354 return err; 3355 3356 ifm = nlmsg_data(nlh); 3357 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3358 if (pfx == NULL) 3359 return -EINVAL; 3360 3361 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3362 } 3363 3364 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3365 u32 prefered_lft, u32 valid_lft) 3366 { 3367 u32 flags; 3368 clock_t expires; 3369 unsigned long timeout; 3370 3371 if (!valid_lft || (prefered_lft > valid_lft)) 3372 return -EINVAL; 3373 3374 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3375 if (addrconf_finite_timeout(timeout)) { 3376 expires = jiffies_to_clock_t(timeout * HZ); 3377 valid_lft = timeout; 3378 flags = RTF_EXPIRES; 3379 } else { 3380 expires = 0; 3381 flags = 0; 3382 ifa_flags |= IFA_F_PERMANENT; 3383 } 3384 3385 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3386 if (addrconf_finite_timeout(timeout)) { 3387 if (timeout == 0) 3388 ifa_flags |= IFA_F_DEPRECATED; 3389 prefered_lft = timeout; 3390 } 3391 3392 spin_lock_bh(&ifp->lock); 3393 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3394 ifp->tstamp = jiffies; 3395 ifp->valid_lft = valid_lft; 3396 ifp->prefered_lft = prefered_lft; 3397 3398 spin_unlock_bh(&ifp->lock); 3399 if (!(ifp->flags&IFA_F_TENTATIVE)) 3400 ipv6_ifa_notify(0, ifp); 3401 3402 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3403 expires, flags); 3404 addrconf_verify(0); 3405 3406 return 0; 3407 } 3408 3409 static int 3410 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3411 { 3412 struct net *net = sock_net(skb->sk); 3413 struct ifaddrmsg *ifm; 3414 struct nlattr *tb[IFA_MAX+1]; 3415 struct in6_addr *pfx; 3416 struct inet6_ifaddr *ifa; 3417 struct net_device *dev; 3418 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3419 u8 ifa_flags; 3420 int err; 3421 3422 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3423 if (err < 0) 3424 return err; 3425 3426 ifm = nlmsg_data(nlh); 3427 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3428 if (pfx == NULL) 3429 return -EINVAL; 3430 3431 if (tb[IFA_CACHEINFO]) { 3432 struct ifa_cacheinfo *ci; 3433 3434 ci = nla_data(tb[IFA_CACHEINFO]); 3435 valid_lft = ci->ifa_valid; 3436 preferred_lft = ci->ifa_prefered; 3437 } else { 3438 preferred_lft = INFINITY_LIFE_TIME; 3439 valid_lft = INFINITY_LIFE_TIME; 3440 } 3441 3442 dev = __dev_get_by_index(net, ifm->ifa_index); 3443 if (dev == NULL) 3444 return -ENODEV; 3445 3446 /* We ignore other flags so far. */ 3447 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3448 3449 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3450 if (ifa == NULL) { 3451 /* 3452 * It would be best to check for !NLM_F_CREATE here but 3453 * userspace alreay relies on not having to provide this. 3454 */ 3455 return inet6_addr_add(net, ifm->ifa_index, pfx, 3456 ifm->ifa_prefixlen, ifa_flags, 3457 preferred_lft, valid_lft); 3458 } 3459 3460 if (nlh->nlmsg_flags & NLM_F_EXCL || 3461 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3462 err = -EEXIST; 3463 else 3464 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3465 3466 in6_ifa_put(ifa); 3467 3468 return err; 3469 } 3470 3471 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3472 u8 scope, int ifindex) 3473 { 3474 struct ifaddrmsg *ifm; 3475 3476 ifm = nlmsg_data(nlh); 3477 ifm->ifa_family = AF_INET6; 3478 ifm->ifa_prefixlen = prefixlen; 3479 ifm->ifa_flags = flags; 3480 ifm->ifa_scope = scope; 3481 ifm->ifa_index = ifindex; 3482 } 3483 3484 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3485 unsigned long tstamp, u32 preferred, u32 valid) 3486 { 3487 struct ifa_cacheinfo ci; 3488 3489 ci.cstamp = cstamp_delta(cstamp); 3490 ci.tstamp = cstamp_delta(tstamp); 3491 ci.ifa_prefered = preferred; 3492 ci.ifa_valid = valid; 3493 3494 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3495 } 3496 3497 static inline int rt_scope(int ifa_scope) 3498 { 3499 if (ifa_scope & IFA_HOST) 3500 return RT_SCOPE_HOST; 3501 else if (ifa_scope & IFA_LINK) 3502 return RT_SCOPE_LINK; 3503 else if (ifa_scope & IFA_SITE) 3504 return RT_SCOPE_SITE; 3505 else 3506 return RT_SCOPE_UNIVERSE; 3507 } 3508 3509 static inline int inet6_ifaddr_msgsize(void) 3510 { 3511 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3512 + nla_total_size(16) /* IFA_ADDRESS */ 3513 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3514 } 3515 3516 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3517 u32 pid, u32 seq, int event, unsigned int flags) 3518 { 3519 struct nlmsghdr *nlh; 3520 u32 preferred, valid; 3521 3522 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3523 if (nlh == NULL) 3524 return -EMSGSIZE; 3525 3526 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3527 ifa->idev->dev->ifindex); 3528 3529 if (!(ifa->flags&IFA_F_PERMANENT)) { 3530 preferred = ifa->prefered_lft; 3531 valid = ifa->valid_lft; 3532 if (preferred != INFINITY_LIFE_TIME) { 3533 long tval = (jiffies - ifa->tstamp)/HZ; 3534 if (preferred > tval) 3535 preferred -= tval; 3536 else 3537 preferred = 0; 3538 if (valid != INFINITY_LIFE_TIME) { 3539 if (valid > tval) 3540 valid -= tval; 3541 else 3542 valid = 0; 3543 } 3544 } 3545 } else { 3546 preferred = INFINITY_LIFE_TIME; 3547 valid = INFINITY_LIFE_TIME; 3548 } 3549 3550 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3551 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3552 nlmsg_cancel(skb, nlh); 3553 return -EMSGSIZE; 3554 } 3555 3556 return nlmsg_end(skb, nlh); 3557 } 3558 3559 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3560 u32 pid, u32 seq, int event, u16 flags) 3561 { 3562 struct nlmsghdr *nlh; 3563 u8 scope = RT_SCOPE_UNIVERSE; 3564 int ifindex = ifmca->idev->dev->ifindex; 3565 3566 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3567 scope = RT_SCOPE_SITE; 3568 3569 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3570 if (nlh == NULL) 3571 return -EMSGSIZE; 3572 3573 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3574 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3575 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3576 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3577 nlmsg_cancel(skb, nlh); 3578 return -EMSGSIZE; 3579 } 3580 3581 return nlmsg_end(skb, nlh); 3582 } 3583 3584 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3585 u32 pid, u32 seq, int event, unsigned int flags) 3586 { 3587 struct nlmsghdr *nlh; 3588 u8 scope = RT_SCOPE_UNIVERSE; 3589 int ifindex = ifaca->aca_idev->dev->ifindex; 3590 3591 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3592 scope = RT_SCOPE_SITE; 3593 3594 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3595 if (nlh == NULL) 3596 return -EMSGSIZE; 3597 3598 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3599 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3600 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3601 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3602 nlmsg_cancel(skb, nlh); 3603 return -EMSGSIZE; 3604 } 3605 3606 return nlmsg_end(skb, nlh); 3607 } 3608 3609 enum addr_type_t { 3610 UNICAST_ADDR, 3611 MULTICAST_ADDR, 3612 ANYCAST_ADDR, 3613 }; 3614 3615 /* called with rcu_read_lock() */ 3616 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3617 struct netlink_callback *cb, enum addr_type_t type, 3618 int s_ip_idx, int *p_ip_idx) 3619 { 3620 struct ifmcaddr6 *ifmca; 3621 struct ifacaddr6 *ifaca; 3622 int err = 1; 3623 int ip_idx = *p_ip_idx; 3624 3625 read_lock_bh(&idev->lock); 3626 switch (type) { 3627 case UNICAST_ADDR: { 3628 struct inet6_ifaddr *ifa; 3629 3630 /* unicast address incl. temp addr */ 3631 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3632 if (++ip_idx < s_ip_idx) 3633 continue; 3634 err = inet6_fill_ifaddr(skb, ifa, 3635 NETLINK_CB(cb->skb).pid, 3636 cb->nlh->nlmsg_seq, 3637 RTM_NEWADDR, 3638 NLM_F_MULTI); 3639 if (err <= 0) 3640 break; 3641 } 3642 break; 3643 } 3644 case MULTICAST_ADDR: 3645 /* multicast address */ 3646 for (ifmca = idev->mc_list; ifmca; 3647 ifmca = ifmca->next, ip_idx++) { 3648 if (ip_idx < s_ip_idx) 3649 continue; 3650 err = inet6_fill_ifmcaddr(skb, ifmca, 3651 NETLINK_CB(cb->skb).pid, 3652 cb->nlh->nlmsg_seq, 3653 RTM_GETMULTICAST, 3654 NLM_F_MULTI); 3655 if (err <= 0) 3656 break; 3657 } 3658 break; 3659 case ANYCAST_ADDR: 3660 /* anycast address */ 3661 for (ifaca = idev->ac_list; ifaca; 3662 ifaca = ifaca->aca_next, ip_idx++) { 3663 if (ip_idx < s_ip_idx) 3664 continue; 3665 err = inet6_fill_ifacaddr(skb, ifaca, 3666 NETLINK_CB(cb->skb).pid, 3667 cb->nlh->nlmsg_seq, 3668 RTM_GETANYCAST, 3669 NLM_F_MULTI); 3670 if (err <= 0) 3671 break; 3672 } 3673 break; 3674 default: 3675 break; 3676 } 3677 read_unlock_bh(&idev->lock); 3678 *p_ip_idx = ip_idx; 3679 return err; 3680 } 3681 3682 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3683 enum addr_type_t type) 3684 { 3685 struct net *net = sock_net(skb->sk); 3686 int h, s_h; 3687 int idx, ip_idx; 3688 int s_idx, s_ip_idx; 3689 struct net_device *dev; 3690 struct inet6_dev *idev; 3691 struct hlist_head *head; 3692 struct hlist_node *node; 3693 3694 s_h = cb->args[0]; 3695 s_idx = idx = cb->args[1]; 3696 s_ip_idx = ip_idx = cb->args[2]; 3697 3698 rcu_read_lock(); 3699 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3700 idx = 0; 3701 head = &net->dev_index_head[h]; 3702 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3703 if (idx < s_idx) 3704 goto cont; 3705 if (h > s_h || idx > s_idx) 3706 s_ip_idx = 0; 3707 ip_idx = 0; 3708 idev = __in6_dev_get(dev); 3709 if (!idev) 3710 goto cont; 3711 3712 if (in6_dump_addrs(idev, skb, cb, type, 3713 s_ip_idx, &ip_idx) <= 0) 3714 goto done; 3715 cont: 3716 idx++; 3717 } 3718 } 3719 done: 3720 rcu_read_unlock(); 3721 cb->args[0] = h; 3722 cb->args[1] = idx; 3723 cb->args[2] = ip_idx; 3724 3725 return skb->len; 3726 } 3727 3728 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3729 { 3730 enum addr_type_t type = UNICAST_ADDR; 3731 3732 return inet6_dump_addr(skb, cb, type); 3733 } 3734 3735 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3736 { 3737 enum addr_type_t type = MULTICAST_ADDR; 3738 3739 return inet6_dump_addr(skb, cb, type); 3740 } 3741 3742 3743 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3744 { 3745 enum addr_type_t type = ANYCAST_ADDR; 3746 3747 return inet6_dump_addr(skb, cb, type); 3748 } 3749 3750 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3751 void *arg) 3752 { 3753 struct net *net = sock_net(in_skb->sk); 3754 struct ifaddrmsg *ifm; 3755 struct nlattr *tb[IFA_MAX+1]; 3756 struct in6_addr *addr = NULL; 3757 struct net_device *dev = NULL; 3758 struct inet6_ifaddr *ifa; 3759 struct sk_buff *skb; 3760 int err; 3761 3762 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3763 if (err < 0) 3764 goto errout; 3765 3766 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3767 if (addr == NULL) { 3768 err = -EINVAL; 3769 goto errout; 3770 } 3771 3772 ifm = nlmsg_data(nlh); 3773 if (ifm->ifa_index) 3774 dev = __dev_get_by_index(net, ifm->ifa_index); 3775 3776 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3777 if (!ifa) { 3778 err = -EADDRNOTAVAIL; 3779 goto errout; 3780 } 3781 3782 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3783 if (!skb) { 3784 err = -ENOBUFS; 3785 goto errout_ifa; 3786 } 3787 3788 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3789 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3790 if (err < 0) { 3791 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3792 WARN_ON(err == -EMSGSIZE); 3793 kfree_skb(skb); 3794 goto errout_ifa; 3795 } 3796 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3797 errout_ifa: 3798 in6_ifa_put(ifa); 3799 errout: 3800 return err; 3801 } 3802 3803 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3804 { 3805 struct sk_buff *skb; 3806 struct net *net = dev_net(ifa->idev->dev); 3807 int err = -ENOBUFS; 3808 3809 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3810 if (skb == NULL) 3811 goto errout; 3812 3813 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3814 if (err < 0) { 3815 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3816 WARN_ON(err == -EMSGSIZE); 3817 kfree_skb(skb); 3818 goto errout; 3819 } 3820 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3821 return; 3822 errout: 3823 if (err < 0) 3824 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3825 } 3826 3827 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3828 __s32 *array, int bytes) 3829 { 3830 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3831 3832 memset(array, 0, bytes); 3833 array[DEVCONF_FORWARDING] = cnf->forwarding; 3834 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3835 array[DEVCONF_MTU6] = cnf->mtu6; 3836 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3837 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3838 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3839 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3840 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3841 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3842 jiffies_to_msecs(cnf->rtr_solicit_interval); 3843 array[DEVCONF_RTR_SOLICIT_DELAY] = 3844 jiffies_to_msecs(cnf->rtr_solicit_delay); 3845 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3846 #ifdef CONFIG_IPV6_PRIVACY 3847 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3848 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3849 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3850 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3851 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3852 #endif 3853 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3854 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3855 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3856 #ifdef CONFIG_IPV6_ROUTER_PREF 3857 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3858 array[DEVCONF_RTR_PROBE_INTERVAL] = 3859 jiffies_to_msecs(cnf->rtr_probe_interval); 3860 #ifdef CONFIG_IPV6_ROUTE_INFO 3861 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3862 #endif 3863 #endif 3864 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3865 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3866 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3867 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3868 #endif 3869 #ifdef CONFIG_IPV6_MROUTE 3870 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3871 #endif 3872 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3873 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3874 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3875 } 3876 3877 static inline size_t inet6_ifla6_size(void) 3878 { 3879 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3880 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3881 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3882 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3883 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3884 } 3885 3886 static inline size_t inet6_if_nlmsg_size(void) 3887 { 3888 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3889 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3890 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3891 + nla_total_size(4) /* IFLA_MTU */ 3892 + nla_total_size(4) /* IFLA_LINK */ 3893 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3894 } 3895 3896 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3897 int items, int bytes) 3898 { 3899 int i; 3900 int pad = bytes - sizeof(u64) * items; 3901 BUG_ON(pad < 0); 3902 3903 /* Use put_unaligned() because stats may not be aligned for u64. */ 3904 put_unaligned(items, &stats[0]); 3905 for (i = 1; i < items; i++) 3906 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3907 3908 memset(&stats[items], 0, pad); 3909 } 3910 3911 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3912 int items, int bytes, size_t syncpoff) 3913 { 3914 int i; 3915 int pad = bytes - sizeof(u64) * items; 3916 BUG_ON(pad < 0); 3917 3918 /* Use put_unaligned() because stats may not be aligned for u64. */ 3919 put_unaligned(items, &stats[0]); 3920 for (i = 1; i < items; i++) 3921 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3922 3923 memset(&stats[items], 0, pad); 3924 } 3925 3926 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3927 int bytes) 3928 { 3929 switch (attrtype) { 3930 case IFLA_INET6_STATS: 3931 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3932 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3933 break; 3934 case IFLA_INET6_ICMP6STATS: 3935 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3936 break; 3937 } 3938 } 3939 3940 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3941 { 3942 struct nlattr *nla; 3943 struct ifla_cacheinfo ci; 3944 3945 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3946 3947 ci.max_reasm_len = IPV6_MAXPLEN; 3948 ci.tstamp = cstamp_delta(idev->tstamp); 3949 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3950 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3951 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3952 3953 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3954 if (nla == NULL) 3955 goto nla_put_failure; 3956 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3957 3958 /* XXX - MC not implemented */ 3959 3960 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3961 if (nla == NULL) 3962 goto nla_put_failure; 3963 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3964 3965 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3966 if (nla == NULL) 3967 goto nla_put_failure; 3968 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3969 3970 return 0; 3971 3972 nla_put_failure: 3973 return -EMSGSIZE; 3974 } 3975 3976 static size_t inet6_get_link_af_size(const struct net_device *dev) 3977 { 3978 if (!__in6_dev_get(dev)) 3979 return 0; 3980 3981 return inet6_ifla6_size(); 3982 } 3983 3984 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 3985 { 3986 struct inet6_dev *idev = __in6_dev_get(dev); 3987 3988 if (!idev) 3989 return -ENODATA; 3990 3991 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 3992 return -EMSGSIZE; 3993 3994 return 0; 3995 } 3996 3997 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3998 u32 pid, u32 seq, int event, unsigned int flags) 3999 { 4000 struct net_device *dev = idev->dev; 4001 struct ifinfomsg *hdr; 4002 struct nlmsghdr *nlh; 4003 void *protoinfo; 4004 4005 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 4006 if (nlh == NULL) 4007 return -EMSGSIZE; 4008 4009 hdr = nlmsg_data(nlh); 4010 hdr->ifi_family = AF_INET6; 4011 hdr->__ifi_pad = 0; 4012 hdr->ifi_type = dev->type; 4013 hdr->ifi_index = dev->ifindex; 4014 hdr->ifi_flags = dev_get_flags(dev); 4015 hdr->ifi_change = 0; 4016 4017 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 4018 4019 if (dev->addr_len) 4020 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 4021 4022 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 4023 if (dev->ifindex != dev->iflink) 4024 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 4025 4026 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4027 if (protoinfo == NULL) 4028 goto nla_put_failure; 4029 4030 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4031 goto nla_put_failure; 4032 4033 nla_nest_end(skb, protoinfo); 4034 return nlmsg_end(skb, nlh); 4035 4036 nla_put_failure: 4037 nlmsg_cancel(skb, nlh); 4038 return -EMSGSIZE; 4039 } 4040 4041 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4042 { 4043 struct net *net = sock_net(skb->sk); 4044 int h, s_h; 4045 int idx = 0, s_idx; 4046 struct net_device *dev; 4047 struct inet6_dev *idev; 4048 struct hlist_head *head; 4049 struct hlist_node *node; 4050 4051 s_h = cb->args[0]; 4052 s_idx = cb->args[1]; 4053 4054 rcu_read_lock(); 4055 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4056 idx = 0; 4057 head = &net->dev_index_head[h]; 4058 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4059 if (idx < s_idx) 4060 goto cont; 4061 idev = __in6_dev_get(dev); 4062 if (!idev) 4063 goto cont; 4064 if (inet6_fill_ifinfo(skb, idev, 4065 NETLINK_CB(cb->skb).pid, 4066 cb->nlh->nlmsg_seq, 4067 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4068 goto out; 4069 cont: 4070 idx++; 4071 } 4072 } 4073 out: 4074 rcu_read_unlock(); 4075 cb->args[1] = idx; 4076 cb->args[0] = h; 4077 4078 return skb->len; 4079 } 4080 4081 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4082 { 4083 struct sk_buff *skb; 4084 struct net *net = dev_net(idev->dev); 4085 int err = -ENOBUFS; 4086 4087 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4088 if (skb == NULL) 4089 goto errout; 4090 4091 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4092 if (err < 0) { 4093 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4094 WARN_ON(err == -EMSGSIZE); 4095 kfree_skb(skb); 4096 goto errout; 4097 } 4098 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4099 return; 4100 errout: 4101 if (err < 0) 4102 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4103 } 4104 4105 static inline size_t inet6_prefix_nlmsg_size(void) 4106 { 4107 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4108 + nla_total_size(sizeof(struct in6_addr)) 4109 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4110 } 4111 4112 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4113 struct prefix_info *pinfo, u32 pid, u32 seq, 4114 int event, unsigned int flags) 4115 { 4116 struct prefixmsg *pmsg; 4117 struct nlmsghdr *nlh; 4118 struct prefix_cacheinfo ci; 4119 4120 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4121 if (nlh == NULL) 4122 return -EMSGSIZE; 4123 4124 pmsg = nlmsg_data(nlh); 4125 pmsg->prefix_family = AF_INET6; 4126 pmsg->prefix_pad1 = 0; 4127 pmsg->prefix_pad2 = 0; 4128 pmsg->prefix_ifindex = idev->dev->ifindex; 4129 pmsg->prefix_len = pinfo->prefix_len; 4130 pmsg->prefix_type = pinfo->type; 4131 pmsg->prefix_pad3 = 0; 4132 pmsg->prefix_flags = 0; 4133 if (pinfo->onlink) 4134 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4135 if (pinfo->autoconf) 4136 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4137 4138 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4139 4140 ci.preferred_time = ntohl(pinfo->prefered); 4141 ci.valid_time = ntohl(pinfo->valid); 4142 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4143 4144 return nlmsg_end(skb, nlh); 4145 4146 nla_put_failure: 4147 nlmsg_cancel(skb, nlh); 4148 return -EMSGSIZE; 4149 } 4150 4151 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4152 struct prefix_info *pinfo) 4153 { 4154 struct sk_buff *skb; 4155 struct net *net = dev_net(idev->dev); 4156 int err = -ENOBUFS; 4157 4158 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4159 if (skb == NULL) 4160 goto errout; 4161 4162 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4163 if (err < 0) { 4164 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4165 WARN_ON(err == -EMSGSIZE); 4166 kfree_skb(skb); 4167 goto errout; 4168 } 4169 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4170 return; 4171 errout: 4172 if (err < 0) 4173 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4174 } 4175 4176 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4177 { 4178 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4179 4180 switch (event) { 4181 case RTM_NEWADDR: 4182 /* 4183 * If the address was optimistic 4184 * we inserted the route at the start of 4185 * our DAD process, so we don't need 4186 * to do it again 4187 */ 4188 if (!(ifp->rt->rt6i_node)) 4189 ip6_ins_rt(ifp->rt); 4190 if (ifp->idev->cnf.forwarding) 4191 addrconf_join_anycast(ifp); 4192 break; 4193 case RTM_DELADDR: 4194 if (ifp->idev->cnf.forwarding) 4195 addrconf_leave_anycast(ifp); 4196 addrconf_leave_solict(ifp->idev, &ifp->addr); 4197 dst_hold(&ifp->rt->dst); 4198 4199 if (ip6_del_rt(ifp->rt)) 4200 dst_free(&ifp->rt->dst); 4201 break; 4202 } 4203 } 4204 4205 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4206 { 4207 rcu_read_lock_bh(); 4208 if (likely(ifp->idev->dead == 0)) 4209 __ipv6_ifa_notify(event, ifp); 4210 rcu_read_unlock_bh(); 4211 } 4212 4213 #ifdef CONFIG_SYSCTL 4214 4215 static 4216 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4217 void __user *buffer, size_t *lenp, loff_t *ppos) 4218 { 4219 int *valp = ctl->data; 4220 int val = *valp; 4221 loff_t pos = *ppos; 4222 int ret; 4223 4224 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4225 4226 if (write) 4227 ret = addrconf_fixup_forwarding(ctl, valp, val); 4228 if (ret) 4229 *ppos = pos; 4230 return ret; 4231 } 4232 4233 static void dev_disable_change(struct inet6_dev *idev) 4234 { 4235 if (!idev || !idev->dev) 4236 return; 4237 4238 if (idev->cnf.disable_ipv6) 4239 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4240 else 4241 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4242 } 4243 4244 static void addrconf_disable_change(struct net *net, __s32 newf) 4245 { 4246 struct net_device *dev; 4247 struct inet6_dev *idev; 4248 4249 rcu_read_lock(); 4250 for_each_netdev_rcu(net, dev) { 4251 idev = __in6_dev_get(dev); 4252 if (idev) { 4253 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4254 idev->cnf.disable_ipv6 = newf; 4255 if (changed) 4256 dev_disable_change(idev); 4257 } 4258 } 4259 rcu_read_unlock(); 4260 } 4261 4262 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4263 { 4264 struct net *net; 4265 4266 net = (struct net *)table->extra2; 4267 4268 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4269 return 0; 4270 4271 if (!rtnl_trylock()) { 4272 /* Restore the original values before restarting */ 4273 *p = old; 4274 return restart_syscall(); 4275 } 4276 4277 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4278 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4279 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4280 addrconf_disable_change(net, newf); 4281 } else if ((!*p) ^ (!old)) 4282 dev_disable_change((struct inet6_dev *)table->extra1); 4283 4284 rtnl_unlock(); 4285 return 0; 4286 } 4287 4288 static 4289 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4290 void __user *buffer, size_t *lenp, loff_t *ppos) 4291 { 4292 int *valp = ctl->data; 4293 int val = *valp; 4294 loff_t pos = *ppos; 4295 int ret; 4296 4297 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4298 4299 if (write) 4300 ret = addrconf_disable_ipv6(ctl, valp, val); 4301 if (ret) 4302 *ppos = pos; 4303 return ret; 4304 } 4305 4306 static struct addrconf_sysctl_table 4307 { 4308 struct ctl_table_header *sysctl_header; 4309 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4310 char *dev_name; 4311 } addrconf_sysctl __read_mostly = { 4312 .sysctl_header = NULL, 4313 .addrconf_vars = { 4314 { 4315 .procname = "forwarding", 4316 .data = &ipv6_devconf.forwarding, 4317 .maxlen = sizeof(int), 4318 .mode = 0644, 4319 .proc_handler = addrconf_sysctl_forward, 4320 }, 4321 { 4322 .procname = "hop_limit", 4323 .data = &ipv6_devconf.hop_limit, 4324 .maxlen = sizeof(int), 4325 .mode = 0644, 4326 .proc_handler = proc_dointvec, 4327 }, 4328 { 4329 .procname = "mtu", 4330 .data = &ipv6_devconf.mtu6, 4331 .maxlen = sizeof(int), 4332 .mode = 0644, 4333 .proc_handler = proc_dointvec, 4334 }, 4335 { 4336 .procname = "accept_ra", 4337 .data = &ipv6_devconf.accept_ra, 4338 .maxlen = sizeof(int), 4339 .mode = 0644, 4340 .proc_handler = proc_dointvec, 4341 }, 4342 { 4343 .procname = "accept_redirects", 4344 .data = &ipv6_devconf.accept_redirects, 4345 .maxlen = sizeof(int), 4346 .mode = 0644, 4347 .proc_handler = proc_dointvec, 4348 }, 4349 { 4350 .procname = "autoconf", 4351 .data = &ipv6_devconf.autoconf, 4352 .maxlen = sizeof(int), 4353 .mode = 0644, 4354 .proc_handler = proc_dointvec, 4355 }, 4356 { 4357 .procname = "dad_transmits", 4358 .data = &ipv6_devconf.dad_transmits, 4359 .maxlen = sizeof(int), 4360 .mode = 0644, 4361 .proc_handler = proc_dointvec, 4362 }, 4363 { 4364 .procname = "router_solicitations", 4365 .data = &ipv6_devconf.rtr_solicits, 4366 .maxlen = sizeof(int), 4367 .mode = 0644, 4368 .proc_handler = proc_dointvec, 4369 }, 4370 { 4371 .procname = "router_solicitation_interval", 4372 .data = &ipv6_devconf.rtr_solicit_interval, 4373 .maxlen = sizeof(int), 4374 .mode = 0644, 4375 .proc_handler = proc_dointvec_jiffies, 4376 }, 4377 { 4378 .procname = "router_solicitation_delay", 4379 .data = &ipv6_devconf.rtr_solicit_delay, 4380 .maxlen = sizeof(int), 4381 .mode = 0644, 4382 .proc_handler = proc_dointvec_jiffies, 4383 }, 4384 { 4385 .procname = "force_mld_version", 4386 .data = &ipv6_devconf.force_mld_version, 4387 .maxlen = sizeof(int), 4388 .mode = 0644, 4389 .proc_handler = proc_dointvec, 4390 }, 4391 #ifdef CONFIG_IPV6_PRIVACY 4392 { 4393 .procname = "use_tempaddr", 4394 .data = &ipv6_devconf.use_tempaddr, 4395 .maxlen = sizeof(int), 4396 .mode = 0644, 4397 .proc_handler = proc_dointvec, 4398 }, 4399 { 4400 .procname = "temp_valid_lft", 4401 .data = &ipv6_devconf.temp_valid_lft, 4402 .maxlen = sizeof(int), 4403 .mode = 0644, 4404 .proc_handler = proc_dointvec, 4405 }, 4406 { 4407 .procname = "temp_prefered_lft", 4408 .data = &ipv6_devconf.temp_prefered_lft, 4409 .maxlen = sizeof(int), 4410 .mode = 0644, 4411 .proc_handler = proc_dointvec, 4412 }, 4413 { 4414 .procname = "regen_max_retry", 4415 .data = &ipv6_devconf.regen_max_retry, 4416 .maxlen = sizeof(int), 4417 .mode = 0644, 4418 .proc_handler = proc_dointvec, 4419 }, 4420 { 4421 .procname = "max_desync_factor", 4422 .data = &ipv6_devconf.max_desync_factor, 4423 .maxlen = sizeof(int), 4424 .mode = 0644, 4425 .proc_handler = proc_dointvec, 4426 }, 4427 #endif 4428 { 4429 .procname = "max_addresses", 4430 .data = &ipv6_devconf.max_addresses, 4431 .maxlen = sizeof(int), 4432 .mode = 0644, 4433 .proc_handler = proc_dointvec, 4434 }, 4435 { 4436 .procname = "accept_ra_defrtr", 4437 .data = &ipv6_devconf.accept_ra_defrtr, 4438 .maxlen = sizeof(int), 4439 .mode = 0644, 4440 .proc_handler = proc_dointvec, 4441 }, 4442 { 4443 .procname = "accept_ra_pinfo", 4444 .data = &ipv6_devconf.accept_ra_pinfo, 4445 .maxlen = sizeof(int), 4446 .mode = 0644, 4447 .proc_handler = proc_dointvec, 4448 }, 4449 #ifdef CONFIG_IPV6_ROUTER_PREF 4450 { 4451 .procname = "accept_ra_rtr_pref", 4452 .data = &ipv6_devconf.accept_ra_rtr_pref, 4453 .maxlen = sizeof(int), 4454 .mode = 0644, 4455 .proc_handler = proc_dointvec, 4456 }, 4457 { 4458 .procname = "router_probe_interval", 4459 .data = &ipv6_devconf.rtr_probe_interval, 4460 .maxlen = sizeof(int), 4461 .mode = 0644, 4462 .proc_handler = proc_dointvec_jiffies, 4463 }, 4464 #ifdef CONFIG_IPV6_ROUTE_INFO 4465 { 4466 .procname = "accept_ra_rt_info_max_plen", 4467 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4468 .maxlen = sizeof(int), 4469 .mode = 0644, 4470 .proc_handler = proc_dointvec, 4471 }, 4472 #endif 4473 #endif 4474 { 4475 .procname = "proxy_ndp", 4476 .data = &ipv6_devconf.proxy_ndp, 4477 .maxlen = sizeof(int), 4478 .mode = 0644, 4479 .proc_handler = proc_dointvec, 4480 }, 4481 { 4482 .procname = "accept_source_route", 4483 .data = &ipv6_devconf.accept_source_route, 4484 .maxlen = sizeof(int), 4485 .mode = 0644, 4486 .proc_handler = proc_dointvec, 4487 }, 4488 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4489 { 4490 .procname = "optimistic_dad", 4491 .data = &ipv6_devconf.optimistic_dad, 4492 .maxlen = sizeof(int), 4493 .mode = 0644, 4494 .proc_handler = proc_dointvec, 4495 4496 }, 4497 #endif 4498 #ifdef CONFIG_IPV6_MROUTE 4499 { 4500 .procname = "mc_forwarding", 4501 .data = &ipv6_devconf.mc_forwarding, 4502 .maxlen = sizeof(int), 4503 .mode = 0444, 4504 .proc_handler = proc_dointvec, 4505 }, 4506 #endif 4507 { 4508 .procname = "disable_ipv6", 4509 .data = &ipv6_devconf.disable_ipv6, 4510 .maxlen = sizeof(int), 4511 .mode = 0644, 4512 .proc_handler = addrconf_sysctl_disable, 4513 }, 4514 { 4515 .procname = "accept_dad", 4516 .data = &ipv6_devconf.accept_dad, 4517 .maxlen = sizeof(int), 4518 .mode = 0644, 4519 .proc_handler = proc_dointvec, 4520 }, 4521 { 4522 .procname = "force_tllao", 4523 .data = &ipv6_devconf.force_tllao, 4524 .maxlen = sizeof(int), 4525 .mode = 0644, 4526 .proc_handler = proc_dointvec 4527 }, 4528 { 4529 /* sentinel */ 4530 } 4531 }, 4532 }; 4533 4534 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4535 struct inet6_dev *idev, struct ipv6_devconf *p) 4536 { 4537 int i; 4538 struct addrconf_sysctl_table *t; 4539 4540 #define ADDRCONF_CTL_PATH_DEV 3 4541 4542 struct ctl_path addrconf_ctl_path[] = { 4543 { .procname = "net", }, 4544 { .procname = "ipv6", }, 4545 { .procname = "conf", }, 4546 { /* to be set */ }, 4547 { }, 4548 }; 4549 4550 4551 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4552 if (t == NULL) 4553 goto out; 4554 4555 for (i = 0; t->addrconf_vars[i].data; i++) { 4556 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4557 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4558 t->addrconf_vars[i].extra2 = net; 4559 } 4560 4561 /* 4562 * Make a copy of dev_name, because '.procname' is regarded as const 4563 * by sysctl and we wouldn't want anyone to change it under our feet 4564 * (see SIOCSIFNAME). 4565 */ 4566 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4567 if (!t->dev_name) 4568 goto free; 4569 4570 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4571 4572 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4573 t->addrconf_vars); 4574 if (t->sysctl_header == NULL) 4575 goto free_procname; 4576 4577 p->sysctl = t; 4578 return 0; 4579 4580 free_procname: 4581 kfree(t->dev_name); 4582 free: 4583 kfree(t); 4584 out: 4585 return -ENOBUFS; 4586 } 4587 4588 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4589 { 4590 struct addrconf_sysctl_table *t; 4591 4592 if (p->sysctl == NULL) 4593 return; 4594 4595 t = p->sysctl; 4596 p->sysctl = NULL; 4597 unregister_net_sysctl_table(t->sysctl_header); 4598 kfree(t->dev_name); 4599 kfree(t); 4600 } 4601 4602 static void addrconf_sysctl_register(struct inet6_dev *idev) 4603 { 4604 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4605 &ndisc_ifinfo_sysctl_change); 4606 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4607 idev, &idev->cnf); 4608 } 4609 4610 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4611 { 4612 __addrconf_sysctl_unregister(&idev->cnf); 4613 neigh_sysctl_unregister(idev->nd_parms); 4614 } 4615 4616 4617 #endif 4618 4619 static int __net_init addrconf_init_net(struct net *net) 4620 { 4621 int err; 4622 struct ipv6_devconf *all, *dflt; 4623 4624 err = -ENOMEM; 4625 all = &ipv6_devconf; 4626 dflt = &ipv6_devconf_dflt; 4627 4628 if (!net_eq(net, &init_net)) { 4629 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4630 if (all == NULL) 4631 goto err_alloc_all; 4632 4633 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4634 if (dflt == NULL) 4635 goto err_alloc_dflt; 4636 } else { 4637 /* these will be inherited by all namespaces */ 4638 dflt->autoconf = ipv6_defaults.autoconf; 4639 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4640 } 4641 4642 net->ipv6.devconf_all = all; 4643 net->ipv6.devconf_dflt = dflt; 4644 4645 #ifdef CONFIG_SYSCTL 4646 err = __addrconf_sysctl_register(net, "all", NULL, all); 4647 if (err < 0) 4648 goto err_reg_all; 4649 4650 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4651 if (err < 0) 4652 goto err_reg_dflt; 4653 #endif 4654 return 0; 4655 4656 #ifdef CONFIG_SYSCTL 4657 err_reg_dflt: 4658 __addrconf_sysctl_unregister(all); 4659 err_reg_all: 4660 kfree(dflt); 4661 #endif 4662 err_alloc_dflt: 4663 kfree(all); 4664 err_alloc_all: 4665 return err; 4666 } 4667 4668 static void __net_exit addrconf_exit_net(struct net *net) 4669 { 4670 #ifdef CONFIG_SYSCTL 4671 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4672 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4673 #endif 4674 if (!net_eq(net, &init_net)) { 4675 kfree(net->ipv6.devconf_dflt); 4676 kfree(net->ipv6.devconf_all); 4677 } 4678 } 4679 4680 static struct pernet_operations addrconf_ops = { 4681 .init = addrconf_init_net, 4682 .exit = addrconf_exit_net, 4683 }; 4684 4685 /* 4686 * Device notifier 4687 */ 4688 4689 int register_inet6addr_notifier(struct notifier_block *nb) 4690 { 4691 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4692 } 4693 EXPORT_SYMBOL(register_inet6addr_notifier); 4694 4695 int unregister_inet6addr_notifier(struct notifier_block *nb) 4696 { 4697 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4698 } 4699 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4700 4701 static struct rtnl_af_ops inet6_ops = { 4702 .family = AF_INET6, 4703 .fill_link_af = inet6_fill_link_af, 4704 .get_link_af_size = inet6_get_link_af_size, 4705 }; 4706 4707 /* 4708 * Init / cleanup code 4709 */ 4710 4711 int __init addrconf_init(void) 4712 { 4713 int i, err; 4714 4715 err = ipv6_addr_label_init(); 4716 if (err < 0) { 4717 printk(KERN_CRIT "IPv6 Addrconf:" 4718 " cannot initialize default policy table: %d.\n", err); 4719 goto out; 4720 } 4721 4722 err = register_pernet_subsys(&addrconf_ops); 4723 if (err < 0) 4724 goto out_addrlabel; 4725 4726 /* The addrconf netdev notifier requires that loopback_dev 4727 * has it's ipv6 private information allocated and setup 4728 * before it can bring up and give link-local addresses 4729 * to other devices which are up. 4730 * 4731 * Unfortunately, loopback_dev is not necessarily the first 4732 * entry in the global dev_base list of net devices. In fact, 4733 * it is likely to be the very last entry on that list. 4734 * So this causes the notifier registry below to try and 4735 * give link-local addresses to all devices besides loopback_dev 4736 * first, then loopback_dev, which cases all the non-loopback_dev 4737 * devices to fail to get a link-local address. 4738 * 4739 * So, as a temporary fix, allocate the ipv6 structure for 4740 * loopback_dev first by hand. 4741 * Longer term, all of the dependencies ipv6 has upon the loopback 4742 * device and it being up should be removed. 4743 */ 4744 rtnl_lock(); 4745 if (!ipv6_add_dev(init_net.loopback_dev)) 4746 err = -ENOMEM; 4747 rtnl_unlock(); 4748 if (err) 4749 goto errlo; 4750 4751 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4752 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4753 4754 register_netdevice_notifier(&ipv6_dev_notf); 4755 4756 addrconf_verify(0); 4757 4758 err = rtnl_af_register(&inet6_ops); 4759 if (err < 0) 4760 goto errout_af; 4761 4762 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4763 NULL); 4764 if (err < 0) 4765 goto errout; 4766 4767 /* Only the first call to __rtnl_register can fail */ 4768 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4769 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4770 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4771 inet6_dump_ifaddr, NULL); 4772 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4773 inet6_dump_ifmcaddr, NULL); 4774 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4775 inet6_dump_ifacaddr, NULL); 4776 4777 ipv6_addr_label_rtnl_register(); 4778 4779 return 0; 4780 errout: 4781 rtnl_af_unregister(&inet6_ops); 4782 errout_af: 4783 unregister_netdevice_notifier(&ipv6_dev_notf); 4784 errlo: 4785 unregister_pernet_subsys(&addrconf_ops); 4786 out_addrlabel: 4787 ipv6_addr_label_cleanup(); 4788 out: 4789 return err; 4790 } 4791 4792 void addrconf_cleanup(void) 4793 { 4794 struct net_device *dev; 4795 int i; 4796 4797 unregister_netdevice_notifier(&ipv6_dev_notf); 4798 unregister_pernet_subsys(&addrconf_ops); 4799 ipv6_addr_label_cleanup(); 4800 4801 rtnl_lock(); 4802 4803 __rtnl_af_unregister(&inet6_ops); 4804 4805 /* clean dev list */ 4806 for_each_netdev(&init_net, dev) { 4807 if (__in6_dev_get(dev) == NULL) 4808 continue; 4809 addrconf_ifdown(dev, 1); 4810 } 4811 addrconf_ifdown(init_net.loopback_dev, 2); 4812 4813 /* 4814 * Check hash table. 4815 */ 4816 spin_lock_bh(&addrconf_hash_lock); 4817 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4818 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4819 spin_unlock_bh(&addrconf_hash_lock); 4820 4821 del_timer(&addr_chk_timer); 4822 rtnl_unlock(); 4823 } 4824