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_assign_pointer(dev->ip6_ptr, ndev); 433 434 /* Join all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 436 437 /* Join all-router multicast group if forwarding is set */ 438 if (ndev->cnf.forwarding && dev && (dev->flags & IFF_MULTICAST)) 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 440 441 return ndev; 442 } 443 444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 445 { 446 struct inet6_dev *idev; 447 448 ASSERT_RTNL(); 449 450 idev = __in6_dev_get(dev); 451 if (!idev) { 452 idev = ipv6_add_dev(dev); 453 if (!idev) 454 return NULL; 455 } 456 457 if (dev->flags&IFF_UP) 458 ipv6_mc_up(idev); 459 return idev; 460 } 461 462 #ifdef CONFIG_SYSCTL 463 static void dev_forward_change(struct inet6_dev *idev) 464 { 465 struct net_device *dev; 466 struct inet6_ifaddr *ifa; 467 468 if (!idev) 469 return; 470 dev = idev->dev; 471 if (idev->cnf.forwarding) 472 dev_disable_lro(dev); 473 if (dev && (dev->flags & IFF_MULTICAST)) { 474 if (idev->cnf.forwarding) 475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 476 else 477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 478 } 479 480 list_for_each_entry(ifa, &idev->addr_list, if_list) { 481 if (ifa->flags&IFA_F_TENTATIVE) 482 continue; 483 if (idev->cnf.forwarding) 484 addrconf_join_anycast(ifa); 485 else 486 addrconf_leave_anycast(ifa); 487 } 488 } 489 490 491 static void addrconf_forward_change(struct net *net, __s32 newf) 492 { 493 struct net_device *dev; 494 struct inet6_dev *idev; 495 496 rcu_read_lock(); 497 for_each_netdev_rcu(net, dev) { 498 idev = __in6_dev_get(dev); 499 if (idev) { 500 int changed = (!idev->cnf.forwarding) ^ (!newf); 501 idev->cnf.forwarding = newf; 502 if (changed) 503 dev_forward_change(idev); 504 } 505 } 506 rcu_read_unlock(); 507 } 508 509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 510 { 511 struct net *net; 512 int old; 513 514 if (!rtnl_trylock()) 515 return restart_syscall(); 516 517 net = (struct net *)table->extra2; 518 old = *p; 519 *p = newf; 520 521 if (p == &net->ipv6.devconf_dflt->forwarding) { 522 rtnl_unlock(); 523 return 0; 524 } 525 526 if (p == &net->ipv6.devconf_all->forwarding) { 527 net->ipv6.devconf_dflt->forwarding = newf; 528 addrconf_forward_change(net, newf); 529 } else if ((!newf) ^ (!old)) 530 dev_forward_change((struct inet6_dev *)table->extra1); 531 rtnl_unlock(); 532 533 if (newf) 534 rt6_purge_dflt_routers(net); 535 return 1; 536 } 537 #endif 538 539 /* Nobody refers to this ifaddr, destroy it */ 540 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 541 { 542 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 543 544 #ifdef NET_REFCNT_DEBUG 545 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 546 #endif 547 548 in6_dev_put(ifp->idev); 549 550 if (del_timer(&ifp->timer)) 551 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 552 553 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 554 pr_warning("Freeing alive inet6 address %p\n", ifp); 555 return; 556 } 557 dst_release(&ifp->rt->dst); 558 559 kfree_rcu(ifp, rcu); 560 } 561 562 static void 563 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 564 { 565 struct list_head *p; 566 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 567 568 /* 569 * Each device address list is sorted in order of scope - 570 * global before linklocal. 571 */ 572 list_for_each(p, &idev->addr_list) { 573 struct inet6_ifaddr *ifa 574 = list_entry(p, struct inet6_ifaddr, if_list); 575 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 576 break; 577 } 578 579 list_add_tail(&ifp->if_list, p); 580 } 581 582 static u32 ipv6_addr_hash(const struct in6_addr *addr) 583 { 584 /* 585 * We perform the hash function over the last 64 bits of the address 586 * This will include the IEEE address token on links that support it. 587 */ 588 return jhash_2words((__force u32)addr->s6_addr32[2], 589 (__force u32)addr->s6_addr32[3], 0) 590 & (IN6_ADDR_HSIZE - 1); 591 } 592 593 /* On success it returns ifp with increased reference count */ 594 595 static struct inet6_ifaddr * 596 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 597 int scope, u32 flags) 598 { 599 struct inet6_ifaddr *ifa = NULL; 600 struct rt6_info *rt; 601 unsigned int hash; 602 int err = 0; 603 int addr_type = ipv6_addr_type(addr); 604 605 if (addr_type == IPV6_ADDR_ANY || 606 addr_type & IPV6_ADDR_MULTICAST || 607 (!(idev->dev->flags & IFF_LOOPBACK) && 608 addr_type & IPV6_ADDR_LOOPBACK)) 609 return ERR_PTR(-EADDRNOTAVAIL); 610 611 rcu_read_lock_bh(); 612 if (idev->dead) { 613 err = -ENODEV; /*XXX*/ 614 goto out2; 615 } 616 617 if (idev->cnf.disable_ipv6) { 618 err = -EACCES; 619 goto out2; 620 } 621 622 spin_lock(&addrconf_hash_lock); 623 624 /* Ignore adding duplicate addresses on an interface */ 625 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 626 ADBG(("ipv6_add_addr: already assigned\n")); 627 err = -EEXIST; 628 goto out; 629 } 630 631 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 632 633 if (ifa == NULL) { 634 ADBG(("ipv6_add_addr: malloc failed\n")); 635 err = -ENOBUFS; 636 goto out; 637 } 638 639 rt = addrconf_dst_alloc(idev, addr, false); 640 if (IS_ERR(rt)) { 641 err = PTR_ERR(rt); 642 goto out; 643 } 644 645 ifa->addr = *addr; 646 647 spin_lock_init(&ifa->lock); 648 spin_lock_init(&ifa->state_lock); 649 init_timer(&ifa->timer); 650 INIT_HLIST_NODE(&ifa->addr_lst); 651 ifa->timer.data = (unsigned long) ifa; 652 ifa->scope = scope; 653 ifa->prefix_len = pfxlen; 654 ifa->flags = flags | IFA_F_TENTATIVE; 655 ifa->cstamp = ifa->tstamp = jiffies; 656 657 ifa->rt = rt; 658 659 ifa->idev = idev; 660 in6_dev_hold(idev); 661 /* For caller */ 662 in6_ifa_hold(ifa); 663 664 /* Add to big hash table */ 665 hash = ipv6_addr_hash(addr); 666 667 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 668 spin_unlock(&addrconf_hash_lock); 669 670 write_lock(&idev->lock); 671 /* Add to inet6_dev unicast addr list. */ 672 ipv6_link_dev_addr(idev, ifa); 673 674 #ifdef CONFIG_IPV6_PRIVACY 675 if (ifa->flags&IFA_F_TEMPORARY) { 676 list_add(&ifa->tmp_list, &idev->tempaddr_list); 677 in6_ifa_hold(ifa); 678 } 679 #endif 680 681 in6_ifa_hold(ifa); 682 write_unlock(&idev->lock); 683 out2: 684 rcu_read_unlock_bh(); 685 686 if (likely(err == 0)) 687 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 688 else { 689 kfree(ifa); 690 ifa = ERR_PTR(err); 691 } 692 693 return ifa; 694 out: 695 spin_unlock(&addrconf_hash_lock); 696 goto out2; 697 } 698 699 /* This function wants to get referenced ifp and releases it before return */ 700 701 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 702 { 703 struct inet6_ifaddr *ifa, *ifn; 704 struct inet6_dev *idev = ifp->idev; 705 int state; 706 int deleted = 0, onlink = 0; 707 unsigned long expires = jiffies; 708 709 spin_lock_bh(&ifp->state_lock); 710 state = ifp->state; 711 ifp->state = INET6_IFADDR_STATE_DEAD; 712 spin_unlock_bh(&ifp->state_lock); 713 714 if (state == INET6_IFADDR_STATE_DEAD) 715 goto out; 716 717 spin_lock_bh(&addrconf_hash_lock); 718 hlist_del_init_rcu(&ifp->addr_lst); 719 spin_unlock_bh(&addrconf_hash_lock); 720 721 write_lock_bh(&idev->lock); 722 #ifdef CONFIG_IPV6_PRIVACY 723 if (ifp->flags&IFA_F_TEMPORARY) { 724 list_del(&ifp->tmp_list); 725 if (ifp->ifpub) { 726 in6_ifa_put(ifp->ifpub); 727 ifp->ifpub = NULL; 728 } 729 __in6_ifa_put(ifp); 730 } 731 #endif 732 733 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 734 if (ifa == ifp) { 735 list_del_init(&ifp->if_list); 736 __in6_ifa_put(ifp); 737 738 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 739 break; 740 deleted = 1; 741 continue; 742 } else if (ifp->flags & IFA_F_PERMANENT) { 743 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 744 ifp->prefix_len)) { 745 if (ifa->flags & IFA_F_PERMANENT) { 746 onlink = 1; 747 if (deleted) 748 break; 749 } else { 750 unsigned long lifetime; 751 752 if (!onlink) 753 onlink = -1; 754 755 spin_lock(&ifa->lock); 756 757 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 758 /* 759 * Note: Because this address is 760 * not permanent, lifetime < 761 * LONG_MAX / HZ here. 762 */ 763 if (time_before(expires, 764 ifa->tstamp + lifetime * HZ)) 765 expires = ifa->tstamp + lifetime * HZ; 766 spin_unlock(&ifa->lock); 767 } 768 } 769 } 770 } 771 write_unlock_bh(&idev->lock); 772 773 addrconf_del_timer(ifp); 774 775 ipv6_ifa_notify(RTM_DELADDR, ifp); 776 777 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 778 779 /* 780 * Purge or update corresponding prefix 781 * 782 * 1) we don't purge prefix here if address was not permanent. 783 * prefix is managed by its own lifetime. 784 * 2) if there're no addresses, delete prefix. 785 * 3) if there're still other permanent address(es), 786 * corresponding prefix is still permanent. 787 * 4) otherwise, update prefix lifetime to the 788 * longest valid lifetime among the corresponding 789 * addresses on the device. 790 * Note: subsequent RA will update lifetime. 791 * 792 * --yoshfuji 793 */ 794 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 795 struct in6_addr prefix; 796 struct rt6_info *rt; 797 struct net *net = dev_net(ifp->idev->dev); 798 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 799 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 800 801 if (rt && addrconf_is_prefix_route(rt)) { 802 if (onlink == 0) { 803 ip6_del_rt(rt); 804 rt = NULL; 805 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 806 rt->dst.expires = expires; 807 rt->rt6i_flags |= RTF_EXPIRES; 808 } 809 } 810 dst_release(&rt->dst); 811 } 812 813 /* clean up prefsrc entries */ 814 rt6_remove_prefsrc(ifp); 815 out: 816 in6_ifa_put(ifp); 817 } 818 819 #ifdef CONFIG_IPV6_PRIVACY 820 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 821 { 822 struct inet6_dev *idev = ifp->idev; 823 struct in6_addr addr, *tmpaddr; 824 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 825 unsigned long regen_advance; 826 int tmp_plen; 827 int ret = 0; 828 int max_addresses; 829 u32 addr_flags; 830 unsigned long now = jiffies; 831 832 write_lock(&idev->lock); 833 if (ift) { 834 spin_lock_bh(&ift->lock); 835 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 836 spin_unlock_bh(&ift->lock); 837 tmpaddr = &addr; 838 } else { 839 tmpaddr = NULL; 840 } 841 retry: 842 in6_dev_hold(idev); 843 if (idev->cnf.use_tempaddr <= 0) { 844 write_unlock(&idev->lock); 845 printk(KERN_INFO 846 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 847 in6_dev_put(idev); 848 ret = -1; 849 goto out; 850 } 851 spin_lock_bh(&ifp->lock); 852 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 853 idev->cnf.use_tempaddr = -1; /*XXX*/ 854 spin_unlock_bh(&ifp->lock); 855 write_unlock(&idev->lock); 856 printk(KERN_WARNING 857 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 858 in6_dev_put(idev); 859 ret = -1; 860 goto out; 861 } 862 in6_ifa_hold(ifp); 863 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 864 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 865 spin_unlock_bh(&ifp->lock); 866 write_unlock(&idev->lock); 867 printk(KERN_WARNING 868 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 869 in6_ifa_put(ifp); 870 in6_dev_put(idev); 871 ret = -1; 872 goto out; 873 } 874 memcpy(&addr.s6_addr[8], idev->rndid, 8); 875 age = (now - ifp->tstamp) / HZ; 876 tmp_valid_lft = min_t(__u32, 877 ifp->valid_lft, 878 idev->cnf.temp_valid_lft + age); 879 tmp_prefered_lft = min_t(__u32, 880 ifp->prefered_lft, 881 idev->cnf.temp_prefered_lft + age - 882 idev->cnf.max_desync_factor); 883 tmp_plen = ifp->prefix_len; 884 max_addresses = idev->cnf.max_addresses; 885 tmp_tstamp = ifp->tstamp; 886 spin_unlock_bh(&ifp->lock); 887 888 regen_advance = idev->cnf.regen_max_retry * 889 idev->cnf.dad_transmits * 890 idev->nd_parms->retrans_time / HZ; 891 write_unlock(&idev->lock); 892 893 /* A temporary address is created only if this calculated Preferred 894 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 895 * an implementation must not create a temporary address with a zero 896 * Preferred Lifetime. 897 */ 898 if (tmp_prefered_lft <= regen_advance) { 899 in6_ifa_put(ifp); 900 in6_dev_put(idev); 901 ret = -1; 902 goto out; 903 } 904 905 addr_flags = IFA_F_TEMPORARY; 906 /* set in addrconf_prefix_rcv() */ 907 if (ifp->flags & IFA_F_OPTIMISTIC) 908 addr_flags |= IFA_F_OPTIMISTIC; 909 910 ift = !max_addresses || 911 ipv6_count_addresses(idev) < max_addresses ? 912 ipv6_add_addr(idev, &addr, tmp_plen, 913 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 914 addr_flags) : NULL; 915 if (!ift || IS_ERR(ift)) { 916 in6_ifa_put(ifp); 917 in6_dev_put(idev); 918 printk(KERN_INFO 919 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 920 tmpaddr = &addr; 921 write_lock(&idev->lock); 922 goto retry; 923 } 924 925 spin_lock_bh(&ift->lock); 926 ift->ifpub = ifp; 927 ift->valid_lft = tmp_valid_lft; 928 ift->prefered_lft = tmp_prefered_lft; 929 ift->cstamp = now; 930 ift->tstamp = tmp_tstamp; 931 spin_unlock_bh(&ift->lock); 932 933 addrconf_dad_start(ift, 0); 934 in6_ifa_put(ift); 935 in6_dev_put(idev); 936 out: 937 return ret; 938 } 939 #endif 940 941 /* 942 * Choose an appropriate source address (RFC3484) 943 */ 944 enum { 945 IPV6_SADDR_RULE_INIT = 0, 946 IPV6_SADDR_RULE_LOCAL, 947 IPV6_SADDR_RULE_SCOPE, 948 IPV6_SADDR_RULE_PREFERRED, 949 #ifdef CONFIG_IPV6_MIP6 950 IPV6_SADDR_RULE_HOA, 951 #endif 952 IPV6_SADDR_RULE_OIF, 953 IPV6_SADDR_RULE_LABEL, 954 #ifdef CONFIG_IPV6_PRIVACY 955 IPV6_SADDR_RULE_PRIVACY, 956 #endif 957 IPV6_SADDR_RULE_ORCHID, 958 IPV6_SADDR_RULE_PREFIX, 959 IPV6_SADDR_RULE_MAX 960 }; 961 962 struct ipv6_saddr_score { 963 int rule; 964 int addr_type; 965 struct inet6_ifaddr *ifa; 966 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 967 int scopedist; 968 int matchlen; 969 }; 970 971 struct ipv6_saddr_dst { 972 const struct in6_addr *addr; 973 int ifindex; 974 int scope; 975 int label; 976 unsigned int prefs; 977 }; 978 979 static inline int ipv6_saddr_preferred(int type) 980 { 981 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 982 return 1; 983 return 0; 984 } 985 986 static int ipv6_get_saddr_eval(struct net *net, 987 struct ipv6_saddr_score *score, 988 struct ipv6_saddr_dst *dst, 989 int i) 990 { 991 int ret; 992 993 if (i <= score->rule) { 994 switch (i) { 995 case IPV6_SADDR_RULE_SCOPE: 996 ret = score->scopedist; 997 break; 998 case IPV6_SADDR_RULE_PREFIX: 999 ret = score->matchlen; 1000 break; 1001 default: 1002 ret = !!test_bit(i, score->scorebits); 1003 } 1004 goto out; 1005 } 1006 1007 switch (i) { 1008 case IPV6_SADDR_RULE_INIT: 1009 /* Rule 0: remember if hiscore is not ready yet */ 1010 ret = !!score->ifa; 1011 break; 1012 case IPV6_SADDR_RULE_LOCAL: 1013 /* Rule 1: Prefer same address */ 1014 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1015 break; 1016 case IPV6_SADDR_RULE_SCOPE: 1017 /* Rule 2: Prefer appropriate scope 1018 * 1019 * ret 1020 * ^ 1021 * -1 | d 15 1022 * ---+--+-+---> scope 1023 * | 1024 * | d is scope of the destination. 1025 * B-d | \ 1026 * | \ <- smaller scope is better if 1027 * B-15 | \ if scope is enough for destinaion. 1028 * | ret = B - scope (-1 <= scope >= d <= 15). 1029 * d-C-1 | / 1030 * |/ <- greater is better 1031 * -C / if scope is not enough for destination. 1032 * /| ret = scope - C (-1 <= d < scope <= 15). 1033 * 1034 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1035 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1036 * Assume B = 0 and we get C > 29. 1037 */ 1038 ret = __ipv6_addr_src_scope(score->addr_type); 1039 if (ret >= dst->scope) 1040 ret = -ret; 1041 else 1042 ret -= 128; /* 30 is enough */ 1043 score->scopedist = ret; 1044 break; 1045 case IPV6_SADDR_RULE_PREFERRED: 1046 /* Rule 3: Avoid deprecated and optimistic addresses */ 1047 ret = ipv6_saddr_preferred(score->addr_type) || 1048 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1049 break; 1050 #ifdef CONFIG_IPV6_MIP6 1051 case IPV6_SADDR_RULE_HOA: 1052 { 1053 /* Rule 4: Prefer home address */ 1054 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1055 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1056 break; 1057 } 1058 #endif 1059 case IPV6_SADDR_RULE_OIF: 1060 /* Rule 5: Prefer outgoing interface */ 1061 ret = (!dst->ifindex || 1062 dst->ifindex == score->ifa->idev->dev->ifindex); 1063 break; 1064 case IPV6_SADDR_RULE_LABEL: 1065 /* Rule 6: Prefer matching label */ 1066 ret = ipv6_addr_label(net, 1067 &score->ifa->addr, score->addr_type, 1068 score->ifa->idev->dev->ifindex) == dst->label; 1069 break; 1070 #ifdef CONFIG_IPV6_PRIVACY 1071 case IPV6_SADDR_RULE_PRIVACY: 1072 { 1073 /* Rule 7: Prefer public address 1074 * Note: prefer temporary address if use_tempaddr >= 2 1075 */ 1076 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1077 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1078 score->ifa->idev->cnf.use_tempaddr >= 2; 1079 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1080 break; 1081 } 1082 #endif 1083 case IPV6_SADDR_RULE_ORCHID: 1084 /* Rule 8-: Prefer ORCHID vs ORCHID or 1085 * non-ORCHID vs non-ORCHID 1086 */ 1087 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1088 ipv6_addr_orchid(dst->addr)); 1089 break; 1090 case IPV6_SADDR_RULE_PREFIX: 1091 /* Rule 8: Use longest matching prefix */ 1092 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1093 dst->addr); 1094 break; 1095 default: 1096 ret = 0; 1097 } 1098 1099 if (ret) 1100 __set_bit(i, score->scorebits); 1101 score->rule = i; 1102 out: 1103 return ret; 1104 } 1105 1106 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1107 const struct in6_addr *daddr, unsigned int prefs, 1108 struct in6_addr *saddr) 1109 { 1110 struct ipv6_saddr_score scores[2], 1111 *score = &scores[0], *hiscore = &scores[1]; 1112 struct ipv6_saddr_dst dst; 1113 struct net_device *dev; 1114 int dst_type; 1115 1116 dst_type = __ipv6_addr_type(daddr); 1117 dst.addr = daddr; 1118 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1119 dst.scope = __ipv6_addr_src_scope(dst_type); 1120 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1121 dst.prefs = prefs; 1122 1123 hiscore->rule = -1; 1124 hiscore->ifa = NULL; 1125 1126 rcu_read_lock(); 1127 1128 for_each_netdev_rcu(net, dev) { 1129 struct inet6_dev *idev; 1130 1131 /* Candidate Source Address (section 4) 1132 * - multicast and link-local destination address, 1133 * the set of candidate source address MUST only 1134 * include addresses assigned to interfaces 1135 * belonging to the same link as the outgoing 1136 * interface. 1137 * (- For site-local destination addresses, the 1138 * set of candidate source addresses MUST only 1139 * include addresses assigned to interfaces 1140 * belonging to the same site as the outgoing 1141 * interface.) 1142 */ 1143 if (((dst_type & IPV6_ADDR_MULTICAST) || 1144 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1145 dst.ifindex && dev->ifindex != dst.ifindex) 1146 continue; 1147 1148 idev = __in6_dev_get(dev); 1149 if (!idev) 1150 continue; 1151 1152 read_lock_bh(&idev->lock); 1153 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1154 int i; 1155 1156 /* 1157 * - Tentative Address (RFC2462 section 5.4) 1158 * - A tentative address is not considered 1159 * "assigned to an interface" in the traditional 1160 * sense, unless it is also flagged as optimistic. 1161 * - Candidate Source Address (section 4) 1162 * - In any case, anycast addresses, multicast 1163 * addresses, and the unspecified address MUST 1164 * NOT be included in a candidate set. 1165 */ 1166 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1167 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1168 continue; 1169 1170 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1171 1172 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1173 score->addr_type & IPV6_ADDR_MULTICAST)) { 1174 LIMIT_NETDEBUG(KERN_DEBUG 1175 "ADDRCONF: unspecified / multicast address " 1176 "assigned as unicast address on %s", 1177 dev->name); 1178 continue; 1179 } 1180 1181 score->rule = -1; 1182 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1183 1184 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1185 int minihiscore, miniscore; 1186 1187 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1188 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1189 1190 if (minihiscore > miniscore) { 1191 if (i == IPV6_SADDR_RULE_SCOPE && 1192 score->scopedist > 0) { 1193 /* 1194 * special case: 1195 * each remaining entry 1196 * has too small (not enough) 1197 * scope, because ifa entries 1198 * are sorted by their scope 1199 * values. 1200 */ 1201 goto try_nextdev; 1202 } 1203 break; 1204 } else if (minihiscore < miniscore) { 1205 if (hiscore->ifa) 1206 in6_ifa_put(hiscore->ifa); 1207 1208 in6_ifa_hold(score->ifa); 1209 1210 swap(hiscore, score); 1211 1212 /* restore our iterator */ 1213 score->ifa = hiscore->ifa; 1214 1215 break; 1216 } 1217 } 1218 } 1219 try_nextdev: 1220 read_unlock_bh(&idev->lock); 1221 } 1222 rcu_read_unlock(); 1223 1224 if (!hiscore->ifa) 1225 return -EADDRNOTAVAIL; 1226 1227 *saddr = hiscore->ifa->addr; 1228 in6_ifa_put(hiscore->ifa); 1229 return 0; 1230 } 1231 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1232 1233 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1234 unsigned char banned_flags) 1235 { 1236 struct inet6_dev *idev; 1237 int err = -EADDRNOTAVAIL; 1238 1239 rcu_read_lock(); 1240 idev = __in6_dev_get(dev); 1241 if (idev) { 1242 struct inet6_ifaddr *ifp; 1243 1244 read_lock_bh(&idev->lock); 1245 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1246 if (ifp->scope == IFA_LINK && 1247 !(ifp->flags & banned_flags)) { 1248 *addr = ifp->addr; 1249 err = 0; 1250 break; 1251 } 1252 } 1253 read_unlock_bh(&idev->lock); 1254 } 1255 rcu_read_unlock(); 1256 return err; 1257 } 1258 1259 static int ipv6_count_addresses(struct inet6_dev *idev) 1260 { 1261 int cnt = 0; 1262 struct inet6_ifaddr *ifp; 1263 1264 read_lock_bh(&idev->lock); 1265 list_for_each_entry(ifp, &idev->addr_list, if_list) 1266 cnt++; 1267 read_unlock_bh(&idev->lock); 1268 return cnt; 1269 } 1270 1271 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1272 struct net_device *dev, int strict) 1273 { 1274 struct inet6_ifaddr *ifp; 1275 struct hlist_node *node; 1276 unsigned int hash = ipv6_addr_hash(addr); 1277 1278 rcu_read_lock_bh(); 1279 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1280 if (!net_eq(dev_net(ifp->idev->dev), net)) 1281 continue; 1282 if (ipv6_addr_equal(&ifp->addr, addr) && 1283 !(ifp->flags&IFA_F_TENTATIVE) && 1284 (dev == NULL || ifp->idev->dev == dev || 1285 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1286 rcu_read_unlock_bh(); 1287 return 1; 1288 } 1289 } 1290 1291 rcu_read_unlock_bh(); 1292 return 0; 1293 } 1294 EXPORT_SYMBOL(ipv6_chk_addr); 1295 1296 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1297 struct net_device *dev) 1298 { 1299 unsigned int hash = ipv6_addr_hash(addr); 1300 struct inet6_ifaddr *ifp; 1301 struct hlist_node *node; 1302 1303 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1304 if (!net_eq(dev_net(ifp->idev->dev), net)) 1305 continue; 1306 if (ipv6_addr_equal(&ifp->addr, addr)) { 1307 if (dev == NULL || ifp->idev->dev == dev) 1308 return true; 1309 } 1310 } 1311 return false; 1312 } 1313 1314 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1315 { 1316 struct inet6_dev *idev; 1317 struct inet6_ifaddr *ifa; 1318 int onlink; 1319 1320 onlink = 0; 1321 rcu_read_lock(); 1322 idev = __in6_dev_get(dev); 1323 if (idev) { 1324 read_lock_bh(&idev->lock); 1325 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1326 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1327 ifa->prefix_len); 1328 if (onlink) 1329 break; 1330 } 1331 read_unlock_bh(&idev->lock); 1332 } 1333 rcu_read_unlock(); 1334 return onlink; 1335 } 1336 1337 EXPORT_SYMBOL(ipv6_chk_prefix); 1338 1339 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1340 struct net_device *dev, int strict) 1341 { 1342 struct inet6_ifaddr *ifp, *result = NULL; 1343 unsigned int hash = ipv6_addr_hash(addr); 1344 struct hlist_node *node; 1345 1346 rcu_read_lock_bh(); 1347 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1348 if (!net_eq(dev_net(ifp->idev->dev), net)) 1349 continue; 1350 if (ipv6_addr_equal(&ifp->addr, addr)) { 1351 if (dev == NULL || ifp->idev->dev == dev || 1352 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1353 result = ifp; 1354 in6_ifa_hold(ifp); 1355 break; 1356 } 1357 } 1358 } 1359 rcu_read_unlock_bh(); 1360 1361 return result; 1362 } 1363 1364 /* Gets referenced address, destroys ifaddr */ 1365 1366 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1367 { 1368 if (ifp->flags&IFA_F_PERMANENT) { 1369 spin_lock_bh(&ifp->lock); 1370 addrconf_del_timer(ifp); 1371 ifp->flags |= IFA_F_TENTATIVE; 1372 if (dad_failed) 1373 ifp->flags |= IFA_F_DADFAILED; 1374 spin_unlock_bh(&ifp->lock); 1375 if (dad_failed) 1376 ipv6_ifa_notify(0, ifp); 1377 in6_ifa_put(ifp); 1378 #ifdef CONFIG_IPV6_PRIVACY 1379 } else if (ifp->flags&IFA_F_TEMPORARY) { 1380 struct inet6_ifaddr *ifpub; 1381 spin_lock_bh(&ifp->lock); 1382 ifpub = ifp->ifpub; 1383 if (ifpub) { 1384 in6_ifa_hold(ifpub); 1385 spin_unlock_bh(&ifp->lock); 1386 ipv6_create_tempaddr(ifpub, ifp); 1387 in6_ifa_put(ifpub); 1388 } else { 1389 spin_unlock_bh(&ifp->lock); 1390 } 1391 ipv6_del_addr(ifp); 1392 #endif 1393 } else 1394 ipv6_del_addr(ifp); 1395 } 1396 1397 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1398 { 1399 int err = -ENOENT; 1400 1401 spin_lock(&ifp->state_lock); 1402 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1403 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1404 err = 0; 1405 } 1406 spin_unlock(&ifp->state_lock); 1407 1408 return err; 1409 } 1410 1411 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1412 { 1413 struct inet6_dev *idev = ifp->idev; 1414 1415 if (addrconf_dad_end(ifp)) { 1416 in6_ifa_put(ifp); 1417 return; 1418 } 1419 1420 if (net_ratelimit()) 1421 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1422 ifp->idev->dev->name, &ifp->addr); 1423 1424 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1425 struct in6_addr addr; 1426 1427 addr.s6_addr32[0] = htonl(0xfe800000); 1428 addr.s6_addr32[1] = 0; 1429 1430 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1431 ipv6_addr_equal(&ifp->addr, &addr)) { 1432 /* DAD failed for link-local based on MAC address */ 1433 idev->cnf.disable_ipv6 = 1; 1434 1435 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1436 ifp->idev->dev->name); 1437 } 1438 } 1439 1440 addrconf_dad_stop(ifp, 1); 1441 } 1442 1443 /* Join to solicited addr multicast group. */ 1444 1445 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1446 { 1447 struct in6_addr maddr; 1448 1449 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1450 return; 1451 1452 addrconf_addr_solict_mult(addr, &maddr); 1453 ipv6_dev_mc_inc(dev, &maddr); 1454 } 1455 1456 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1457 { 1458 struct in6_addr maddr; 1459 1460 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1461 return; 1462 1463 addrconf_addr_solict_mult(addr, &maddr); 1464 __ipv6_dev_mc_dec(idev, &maddr); 1465 } 1466 1467 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1468 { 1469 struct in6_addr addr; 1470 if (ifp->prefix_len == 127) /* RFC 6164 */ 1471 return; 1472 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1473 if (ipv6_addr_any(&addr)) 1474 return; 1475 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1476 } 1477 1478 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1479 { 1480 struct in6_addr addr; 1481 if (ifp->prefix_len == 127) /* RFC 6164 */ 1482 return; 1483 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1484 if (ipv6_addr_any(&addr)) 1485 return; 1486 __ipv6_dev_ac_dec(ifp->idev, &addr); 1487 } 1488 1489 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1490 { 1491 if (dev->addr_len != ETH_ALEN) 1492 return -1; 1493 memcpy(eui, dev->dev_addr, 3); 1494 memcpy(eui + 5, dev->dev_addr + 3, 3); 1495 1496 /* 1497 * The zSeries OSA network cards can be shared among various 1498 * OS instances, but the OSA cards have only one MAC address. 1499 * This leads to duplicate address conflicts in conjunction 1500 * with IPv6 if more than one instance uses the same card. 1501 * 1502 * The driver for these cards can deliver a unique 16-bit 1503 * identifier for each instance sharing the same card. It is 1504 * placed instead of 0xFFFE in the interface identifier. The 1505 * "u" bit of the interface identifier is not inverted in this 1506 * case. Hence the resulting interface identifier has local 1507 * scope according to RFC2373. 1508 */ 1509 if (dev->dev_id) { 1510 eui[3] = (dev->dev_id >> 8) & 0xFF; 1511 eui[4] = dev->dev_id & 0xFF; 1512 } else { 1513 eui[3] = 0xFF; 1514 eui[4] = 0xFE; 1515 eui[0] ^= 2; 1516 } 1517 return 0; 1518 } 1519 1520 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1521 { 1522 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1523 if (dev->addr_len != ARCNET_ALEN) 1524 return -1; 1525 memset(eui, 0, 7); 1526 eui[7] = *(u8*)dev->dev_addr; 1527 return 0; 1528 } 1529 1530 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1531 { 1532 if (dev->addr_len != INFINIBAND_ALEN) 1533 return -1; 1534 memcpy(eui, dev->dev_addr + 12, 8); 1535 eui[0] |= 2; 1536 return 0; 1537 } 1538 1539 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1540 { 1541 if (addr == 0) 1542 return -1; 1543 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1544 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1545 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1546 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1547 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1548 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1549 eui[1] = 0; 1550 eui[2] = 0x5E; 1551 eui[3] = 0xFE; 1552 memcpy(eui + 4, &addr, 4); 1553 return 0; 1554 } 1555 1556 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1557 { 1558 if (dev->priv_flags & IFF_ISATAP) 1559 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1560 return -1; 1561 } 1562 1563 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1564 { 1565 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1566 } 1567 1568 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1569 { 1570 switch (dev->type) { 1571 case ARPHRD_ETHER: 1572 case ARPHRD_FDDI: 1573 case ARPHRD_IEEE802_TR: 1574 return addrconf_ifid_eui48(eui, dev); 1575 case ARPHRD_ARCNET: 1576 return addrconf_ifid_arcnet(eui, dev); 1577 case ARPHRD_INFINIBAND: 1578 return addrconf_ifid_infiniband(eui, dev); 1579 case ARPHRD_SIT: 1580 return addrconf_ifid_sit(eui, dev); 1581 case ARPHRD_IPGRE: 1582 return addrconf_ifid_gre(eui, dev); 1583 } 1584 return -1; 1585 } 1586 1587 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1588 { 1589 int err = -1; 1590 struct inet6_ifaddr *ifp; 1591 1592 read_lock_bh(&idev->lock); 1593 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1594 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1595 memcpy(eui, ifp->addr.s6_addr+8, 8); 1596 err = 0; 1597 break; 1598 } 1599 } 1600 read_unlock_bh(&idev->lock); 1601 return err; 1602 } 1603 1604 #ifdef CONFIG_IPV6_PRIVACY 1605 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1606 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1607 { 1608 regen: 1609 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1610 idev->rndid[0] &= ~0x02; 1611 1612 /* 1613 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1614 * check if generated address is not inappropriate 1615 * 1616 * - Reserved subnet anycast (RFC 2526) 1617 * 11111101 11....11 1xxxxxxx 1618 * - ISATAP (RFC4214) 6.1 1619 * 00-00-5E-FE-xx-xx-xx-xx 1620 * - value 0 1621 * - XXX: already assigned to an address on the device 1622 */ 1623 if (idev->rndid[0] == 0xfd && 1624 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1625 (idev->rndid[7]&0x80)) 1626 goto regen; 1627 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1628 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1629 goto regen; 1630 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1631 goto regen; 1632 } 1633 1634 return 0; 1635 } 1636 1637 static void ipv6_regen_rndid(unsigned long data) 1638 { 1639 struct inet6_dev *idev = (struct inet6_dev *) data; 1640 unsigned long expires; 1641 1642 rcu_read_lock_bh(); 1643 write_lock_bh(&idev->lock); 1644 1645 if (idev->dead) 1646 goto out; 1647 1648 if (__ipv6_regen_rndid(idev) < 0) 1649 goto out; 1650 1651 expires = jiffies + 1652 idev->cnf.temp_prefered_lft * HZ - 1653 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1654 idev->cnf.max_desync_factor * HZ; 1655 if (time_before(expires, jiffies)) { 1656 printk(KERN_WARNING 1657 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1658 idev->dev->name); 1659 goto out; 1660 } 1661 1662 if (!mod_timer(&idev->regen_timer, expires)) 1663 in6_dev_hold(idev); 1664 1665 out: 1666 write_unlock_bh(&idev->lock); 1667 rcu_read_unlock_bh(); 1668 in6_dev_put(idev); 1669 } 1670 1671 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1672 int ret = 0; 1673 1674 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1675 ret = __ipv6_regen_rndid(idev); 1676 return ret; 1677 } 1678 #endif 1679 1680 /* 1681 * Add prefix route. 1682 */ 1683 1684 static void 1685 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1686 unsigned long expires, u32 flags) 1687 { 1688 struct fib6_config cfg = { 1689 .fc_table = RT6_TABLE_PREFIX, 1690 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1691 .fc_ifindex = dev->ifindex, 1692 .fc_expires = expires, 1693 .fc_dst_len = plen, 1694 .fc_flags = RTF_UP | flags, 1695 .fc_nlinfo.nl_net = dev_net(dev), 1696 .fc_protocol = RTPROT_KERNEL, 1697 }; 1698 1699 cfg.fc_dst = *pfx; 1700 1701 /* Prevent useless cloning on PtP SIT. 1702 This thing is done here expecting that the whole 1703 class of non-broadcast devices need not cloning. 1704 */ 1705 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1706 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1707 cfg.fc_flags |= RTF_NONEXTHOP; 1708 #endif 1709 1710 ip6_route_add(&cfg); 1711 } 1712 1713 1714 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1715 int plen, 1716 const struct net_device *dev, 1717 u32 flags, u32 noflags) 1718 { 1719 struct fib6_node *fn; 1720 struct rt6_info *rt = NULL; 1721 struct fib6_table *table; 1722 1723 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1724 if (table == NULL) 1725 return NULL; 1726 1727 write_lock_bh(&table->tb6_lock); 1728 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1729 if (!fn) 1730 goto out; 1731 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1732 if (rt->dst.dev->ifindex != dev->ifindex) 1733 continue; 1734 if ((rt->rt6i_flags & flags) != flags) 1735 continue; 1736 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0)) 1737 continue; 1738 dst_hold(&rt->dst); 1739 break; 1740 } 1741 out: 1742 write_unlock_bh(&table->tb6_lock); 1743 return rt; 1744 } 1745 1746 1747 /* Create "default" multicast route to the interface */ 1748 1749 static void addrconf_add_mroute(struct net_device *dev) 1750 { 1751 struct fib6_config cfg = { 1752 .fc_table = RT6_TABLE_LOCAL, 1753 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1754 .fc_ifindex = dev->ifindex, 1755 .fc_dst_len = 8, 1756 .fc_flags = RTF_UP, 1757 .fc_nlinfo.nl_net = dev_net(dev), 1758 }; 1759 1760 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1761 1762 ip6_route_add(&cfg); 1763 } 1764 1765 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1766 static void sit_route_add(struct net_device *dev) 1767 { 1768 struct fib6_config cfg = { 1769 .fc_table = RT6_TABLE_MAIN, 1770 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1771 .fc_ifindex = dev->ifindex, 1772 .fc_dst_len = 96, 1773 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1774 .fc_nlinfo.nl_net = dev_net(dev), 1775 }; 1776 1777 /* prefix length - 96 bits "::d.d.d.d" */ 1778 ip6_route_add(&cfg); 1779 } 1780 #endif 1781 1782 static void addrconf_add_lroute(struct net_device *dev) 1783 { 1784 struct in6_addr addr; 1785 1786 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1787 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1788 } 1789 1790 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1791 { 1792 struct inet6_dev *idev; 1793 1794 ASSERT_RTNL(); 1795 1796 idev = ipv6_find_idev(dev); 1797 if (!idev) 1798 return ERR_PTR(-ENOBUFS); 1799 1800 if (idev->cnf.disable_ipv6) 1801 return ERR_PTR(-EACCES); 1802 1803 /* Add default multicast route */ 1804 if (!(dev->flags & IFF_LOOPBACK)) 1805 addrconf_add_mroute(dev); 1806 1807 /* Add link local route */ 1808 addrconf_add_lroute(dev); 1809 return idev; 1810 } 1811 1812 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 1813 { 1814 struct prefix_info *pinfo; 1815 __u32 valid_lft; 1816 __u32 prefered_lft; 1817 int addr_type; 1818 struct inet6_dev *in6_dev; 1819 struct net *net = dev_net(dev); 1820 1821 pinfo = (struct prefix_info *) opt; 1822 1823 if (len < sizeof(struct prefix_info)) { 1824 ADBG(("addrconf: prefix option too short\n")); 1825 return; 1826 } 1827 1828 /* 1829 * Validation checks ([ADDRCONF], page 19) 1830 */ 1831 1832 addr_type = ipv6_addr_type(&pinfo->prefix); 1833 1834 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1835 return; 1836 1837 valid_lft = ntohl(pinfo->valid); 1838 prefered_lft = ntohl(pinfo->prefered); 1839 1840 if (prefered_lft > valid_lft) { 1841 if (net_ratelimit()) 1842 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1843 return; 1844 } 1845 1846 in6_dev = in6_dev_get(dev); 1847 1848 if (in6_dev == NULL) { 1849 if (net_ratelimit()) 1850 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1851 return; 1852 } 1853 1854 /* 1855 * Two things going on here: 1856 * 1) Add routes for on-link prefixes 1857 * 2) Configure prefixes with the auto flag set 1858 */ 1859 1860 if (pinfo->onlink) { 1861 struct rt6_info *rt; 1862 unsigned long rt_expires; 1863 1864 /* Avoid arithmetic overflow. Really, we could 1865 * save rt_expires in seconds, likely valid_lft, 1866 * but it would require division in fib gc, that it 1867 * not good. 1868 */ 1869 if (HZ > USER_HZ) 1870 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1871 else 1872 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1873 1874 if (addrconf_finite_timeout(rt_expires)) 1875 rt_expires *= HZ; 1876 1877 rt = addrconf_get_prefix_route(&pinfo->prefix, 1878 pinfo->prefix_len, 1879 dev, 1880 RTF_ADDRCONF | RTF_PREFIX_RT, 1881 RTF_GATEWAY | RTF_DEFAULT); 1882 1883 if (rt) { 1884 /* Autoconf prefix route */ 1885 if (valid_lft == 0) { 1886 ip6_del_rt(rt); 1887 rt = NULL; 1888 } else if (addrconf_finite_timeout(rt_expires)) { 1889 /* not infinity */ 1890 rt->dst.expires = jiffies + rt_expires; 1891 rt->rt6i_flags |= RTF_EXPIRES; 1892 } else { 1893 rt->rt6i_flags &= ~RTF_EXPIRES; 1894 rt->dst.expires = 0; 1895 } 1896 } else if (valid_lft) { 1897 clock_t expires = 0; 1898 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1899 if (addrconf_finite_timeout(rt_expires)) { 1900 /* not infinity */ 1901 flags |= RTF_EXPIRES; 1902 expires = jiffies_to_clock_t(rt_expires); 1903 } 1904 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1905 dev, expires, flags); 1906 } 1907 if (rt) 1908 dst_release(&rt->dst); 1909 } 1910 1911 /* Try to figure out our local address for this prefix */ 1912 1913 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1914 struct inet6_ifaddr * ifp; 1915 struct in6_addr addr; 1916 int create = 0, update_lft = 0; 1917 1918 if (pinfo->prefix_len == 64) { 1919 memcpy(&addr, &pinfo->prefix, 8); 1920 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1921 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1922 in6_dev_put(in6_dev); 1923 return; 1924 } 1925 goto ok; 1926 } 1927 if (net_ratelimit()) 1928 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1929 pinfo->prefix_len); 1930 in6_dev_put(in6_dev); 1931 return; 1932 1933 ok: 1934 1935 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1936 1937 if (ifp == NULL && valid_lft) { 1938 int max_addresses = in6_dev->cnf.max_addresses; 1939 u32 addr_flags = 0; 1940 1941 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1942 if (in6_dev->cnf.optimistic_dad && 1943 !net->ipv6.devconf_all->forwarding && sllao) 1944 addr_flags = IFA_F_OPTIMISTIC; 1945 #endif 1946 1947 /* Do not allow to create too much of autoconfigured 1948 * addresses; this would be too easy way to crash kernel. 1949 */ 1950 if (!max_addresses || 1951 ipv6_count_addresses(in6_dev) < max_addresses) 1952 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1953 addr_type&IPV6_ADDR_SCOPE_MASK, 1954 addr_flags); 1955 1956 if (!ifp || IS_ERR(ifp)) { 1957 in6_dev_put(in6_dev); 1958 return; 1959 } 1960 1961 update_lft = create = 1; 1962 ifp->cstamp = jiffies; 1963 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1964 } 1965 1966 if (ifp) { 1967 int flags; 1968 unsigned long now; 1969 #ifdef CONFIG_IPV6_PRIVACY 1970 struct inet6_ifaddr *ift; 1971 #endif 1972 u32 stored_lft; 1973 1974 /* update lifetime (RFC2462 5.5.3 e) */ 1975 spin_lock(&ifp->lock); 1976 now = jiffies; 1977 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1978 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1979 else 1980 stored_lft = 0; 1981 if (!update_lft && stored_lft) { 1982 if (valid_lft > MIN_VALID_LIFETIME || 1983 valid_lft > stored_lft) 1984 update_lft = 1; 1985 else if (stored_lft <= MIN_VALID_LIFETIME) { 1986 /* valid_lft <= stored_lft is always true */ 1987 /* 1988 * RFC 4862 Section 5.5.3e: 1989 * "Note that the preferred lifetime of 1990 * the corresponding address is always 1991 * reset to the Preferred Lifetime in 1992 * the received Prefix Information 1993 * option, regardless of whether the 1994 * valid lifetime is also reset or 1995 * ignored." 1996 * 1997 * So if the preferred lifetime in 1998 * this advertisement is different 1999 * than what we have stored, but the 2000 * valid lifetime is invalid, just 2001 * reset prefered_lft. 2002 * 2003 * We must set the valid lifetime 2004 * to the stored lifetime since we'll 2005 * be updating the timestamp below, 2006 * else we'll set it back to the 2007 * minimum. 2008 */ 2009 if (prefered_lft != ifp->prefered_lft) { 2010 valid_lft = stored_lft; 2011 update_lft = 1; 2012 } 2013 } else { 2014 valid_lft = MIN_VALID_LIFETIME; 2015 if (valid_lft < prefered_lft) 2016 prefered_lft = valid_lft; 2017 update_lft = 1; 2018 } 2019 } 2020 2021 if (update_lft) { 2022 ifp->valid_lft = valid_lft; 2023 ifp->prefered_lft = prefered_lft; 2024 ifp->tstamp = now; 2025 flags = ifp->flags; 2026 ifp->flags &= ~IFA_F_DEPRECATED; 2027 spin_unlock(&ifp->lock); 2028 2029 if (!(flags&IFA_F_TENTATIVE)) 2030 ipv6_ifa_notify(0, ifp); 2031 } else 2032 spin_unlock(&ifp->lock); 2033 2034 #ifdef CONFIG_IPV6_PRIVACY 2035 read_lock_bh(&in6_dev->lock); 2036 /* update all temporary addresses in the list */ 2037 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2038 tmp_list) { 2039 int age, max_valid, max_prefered; 2040 2041 if (ifp != ift->ifpub) 2042 continue; 2043 2044 /* 2045 * RFC 4941 section 3.3: 2046 * If a received option will extend the lifetime 2047 * of a public address, the lifetimes of 2048 * temporary addresses should be extended, 2049 * subject to the overall constraint that no 2050 * temporary addresses should ever remain 2051 * "valid" or "preferred" for a time longer than 2052 * (TEMP_VALID_LIFETIME) or 2053 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2054 * respectively. 2055 */ 2056 age = (now - ift->cstamp) / HZ; 2057 max_valid = in6_dev->cnf.temp_valid_lft - age; 2058 if (max_valid < 0) 2059 max_valid = 0; 2060 2061 max_prefered = in6_dev->cnf.temp_prefered_lft - 2062 in6_dev->cnf.max_desync_factor - 2063 age; 2064 if (max_prefered < 0) 2065 max_prefered = 0; 2066 2067 if (valid_lft > max_valid) 2068 valid_lft = max_valid; 2069 2070 if (prefered_lft > max_prefered) 2071 prefered_lft = max_prefered; 2072 2073 spin_lock(&ift->lock); 2074 flags = ift->flags; 2075 ift->valid_lft = valid_lft; 2076 ift->prefered_lft = prefered_lft; 2077 ift->tstamp = now; 2078 if (prefered_lft > 0) 2079 ift->flags &= ~IFA_F_DEPRECATED; 2080 2081 spin_unlock(&ift->lock); 2082 if (!(flags&IFA_F_TENTATIVE)) 2083 ipv6_ifa_notify(0, ift); 2084 } 2085 2086 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2087 /* 2088 * When a new public address is created as 2089 * described in [ADDRCONF], also create a new 2090 * temporary address. Also create a temporary 2091 * address if it's enabled but no temporary 2092 * address currently exists. 2093 */ 2094 read_unlock_bh(&in6_dev->lock); 2095 ipv6_create_tempaddr(ifp, NULL); 2096 } else { 2097 read_unlock_bh(&in6_dev->lock); 2098 } 2099 #endif 2100 in6_ifa_put(ifp); 2101 addrconf_verify(0); 2102 } 2103 } 2104 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2105 in6_dev_put(in6_dev); 2106 } 2107 2108 /* 2109 * Set destination address. 2110 * Special case for SIT interfaces where we create a new "virtual" 2111 * device. 2112 */ 2113 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2114 { 2115 struct in6_ifreq ireq; 2116 struct net_device *dev; 2117 int err = -EINVAL; 2118 2119 rtnl_lock(); 2120 2121 err = -EFAULT; 2122 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2123 goto err_exit; 2124 2125 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2126 2127 err = -ENODEV; 2128 if (dev == NULL) 2129 goto err_exit; 2130 2131 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2132 if (dev->type == ARPHRD_SIT) { 2133 const struct net_device_ops *ops = dev->netdev_ops; 2134 struct ifreq ifr; 2135 struct ip_tunnel_parm p; 2136 2137 err = -EADDRNOTAVAIL; 2138 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2139 goto err_exit; 2140 2141 memset(&p, 0, sizeof(p)); 2142 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2143 p.iph.saddr = 0; 2144 p.iph.version = 4; 2145 p.iph.ihl = 5; 2146 p.iph.protocol = IPPROTO_IPV6; 2147 p.iph.ttl = 64; 2148 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2149 2150 if (ops->ndo_do_ioctl) { 2151 mm_segment_t oldfs = get_fs(); 2152 2153 set_fs(KERNEL_DS); 2154 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2155 set_fs(oldfs); 2156 } else 2157 err = -EOPNOTSUPP; 2158 2159 if (err == 0) { 2160 err = -ENOBUFS; 2161 dev = __dev_get_by_name(net, p.name); 2162 if (!dev) 2163 goto err_exit; 2164 err = dev_open(dev); 2165 } 2166 } 2167 #endif 2168 2169 err_exit: 2170 rtnl_unlock(); 2171 return err; 2172 } 2173 2174 /* 2175 * Manual configuration of address on an interface 2176 */ 2177 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2178 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2179 __u32 valid_lft) 2180 { 2181 struct inet6_ifaddr *ifp; 2182 struct inet6_dev *idev; 2183 struct net_device *dev; 2184 int scope; 2185 u32 flags; 2186 clock_t expires; 2187 unsigned long timeout; 2188 2189 ASSERT_RTNL(); 2190 2191 if (plen > 128) 2192 return -EINVAL; 2193 2194 /* check the lifetime */ 2195 if (!valid_lft || prefered_lft > valid_lft) 2196 return -EINVAL; 2197 2198 dev = __dev_get_by_index(net, ifindex); 2199 if (!dev) 2200 return -ENODEV; 2201 2202 idev = addrconf_add_dev(dev); 2203 if (IS_ERR(idev)) 2204 return PTR_ERR(idev); 2205 2206 scope = ipv6_addr_scope(pfx); 2207 2208 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2209 if (addrconf_finite_timeout(timeout)) { 2210 expires = jiffies_to_clock_t(timeout * HZ); 2211 valid_lft = timeout; 2212 flags = RTF_EXPIRES; 2213 } else { 2214 expires = 0; 2215 flags = 0; 2216 ifa_flags |= IFA_F_PERMANENT; 2217 } 2218 2219 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2220 if (addrconf_finite_timeout(timeout)) { 2221 if (timeout == 0) 2222 ifa_flags |= IFA_F_DEPRECATED; 2223 prefered_lft = timeout; 2224 } 2225 2226 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2227 2228 if (!IS_ERR(ifp)) { 2229 spin_lock_bh(&ifp->lock); 2230 ifp->valid_lft = valid_lft; 2231 ifp->prefered_lft = prefered_lft; 2232 ifp->tstamp = jiffies; 2233 spin_unlock_bh(&ifp->lock); 2234 2235 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2236 expires, flags); 2237 /* 2238 * Note that section 3.1 of RFC 4429 indicates 2239 * that the Optimistic flag should not be set for 2240 * manually configured addresses 2241 */ 2242 addrconf_dad_start(ifp, 0); 2243 in6_ifa_put(ifp); 2244 addrconf_verify(0); 2245 return 0; 2246 } 2247 2248 return PTR_ERR(ifp); 2249 } 2250 2251 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2252 unsigned int plen) 2253 { 2254 struct inet6_ifaddr *ifp; 2255 struct inet6_dev *idev; 2256 struct net_device *dev; 2257 2258 if (plen > 128) 2259 return -EINVAL; 2260 2261 dev = __dev_get_by_index(net, ifindex); 2262 if (!dev) 2263 return -ENODEV; 2264 2265 if ((idev = __in6_dev_get(dev)) == NULL) 2266 return -ENXIO; 2267 2268 read_lock_bh(&idev->lock); 2269 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2270 if (ifp->prefix_len == plen && 2271 ipv6_addr_equal(pfx, &ifp->addr)) { 2272 in6_ifa_hold(ifp); 2273 read_unlock_bh(&idev->lock); 2274 2275 ipv6_del_addr(ifp); 2276 2277 /* If the last address is deleted administratively, 2278 disable IPv6 on this interface. 2279 */ 2280 if (list_empty(&idev->addr_list)) 2281 addrconf_ifdown(idev->dev, 1); 2282 return 0; 2283 } 2284 } 2285 read_unlock_bh(&idev->lock); 2286 return -EADDRNOTAVAIL; 2287 } 2288 2289 2290 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2291 { 2292 struct in6_ifreq ireq; 2293 int err; 2294 2295 if (!capable(CAP_NET_ADMIN)) 2296 return -EPERM; 2297 2298 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2299 return -EFAULT; 2300 2301 rtnl_lock(); 2302 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2303 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2304 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2305 rtnl_unlock(); 2306 return err; 2307 } 2308 2309 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2310 { 2311 struct in6_ifreq ireq; 2312 int err; 2313 2314 if (!capable(CAP_NET_ADMIN)) 2315 return -EPERM; 2316 2317 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2318 return -EFAULT; 2319 2320 rtnl_lock(); 2321 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2322 ireq.ifr6_prefixlen); 2323 rtnl_unlock(); 2324 return err; 2325 } 2326 2327 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2328 int plen, int scope) 2329 { 2330 struct inet6_ifaddr *ifp; 2331 2332 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2333 if (!IS_ERR(ifp)) { 2334 spin_lock_bh(&ifp->lock); 2335 ifp->flags &= ~IFA_F_TENTATIVE; 2336 spin_unlock_bh(&ifp->lock); 2337 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2338 in6_ifa_put(ifp); 2339 } 2340 } 2341 2342 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2343 static void sit_add_v4_addrs(struct inet6_dev *idev) 2344 { 2345 struct in6_addr addr; 2346 struct net_device *dev; 2347 struct net *net = dev_net(idev->dev); 2348 int scope; 2349 2350 ASSERT_RTNL(); 2351 2352 memset(&addr, 0, sizeof(struct in6_addr)); 2353 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2354 2355 if (idev->dev->flags&IFF_POINTOPOINT) { 2356 addr.s6_addr32[0] = htonl(0xfe800000); 2357 scope = IFA_LINK; 2358 } else { 2359 scope = IPV6_ADDR_COMPATv4; 2360 } 2361 2362 if (addr.s6_addr32[3]) { 2363 add_addr(idev, &addr, 128, scope); 2364 return; 2365 } 2366 2367 for_each_netdev(net, dev) { 2368 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2369 if (in_dev && (dev->flags & IFF_UP)) { 2370 struct in_ifaddr * ifa; 2371 2372 int flag = scope; 2373 2374 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2375 int plen; 2376 2377 addr.s6_addr32[3] = ifa->ifa_local; 2378 2379 if (ifa->ifa_scope == RT_SCOPE_LINK) 2380 continue; 2381 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2382 if (idev->dev->flags&IFF_POINTOPOINT) 2383 continue; 2384 flag |= IFA_HOST; 2385 } 2386 if (idev->dev->flags&IFF_POINTOPOINT) 2387 plen = 64; 2388 else 2389 plen = 96; 2390 2391 add_addr(idev, &addr, plen, flag); 2392 } 2393 } 2394 } 2395 } 2396 #endif 2397 2398 static void init_loopback(struct net_device *dev) 2399 { 2400 struct inet6_dev *idev; 2401 2402 /* ::1 */ 2403 2404 ASSERT_RTNL(); 2405 2406 if ((idev = ipv6_find_idev(dev)) == NULL) { 2407 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2408 return; 2409 } 2410 2411 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2412 } 2413 2414 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2415 { 2416 struct inet6_ifaddr * ifp; 2417 u32 addr_flags = IFA_F_PERMANENT; 2418 2419 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2420 if (idev->cnf.optimistic_dad && 2421 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2422 addr_flags |= IFA_F_OPTIMISTIC; 2423 #endif 2424 2425 2426 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2427 if (!IS_ERR(ifp)) { 2428 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2429 addrconf_dad_start(ifp, 0); 2430 in6_ifa_put(ifp); 2431 } 2432 } 2433 2434 static void addrconf_dev_config(struct net_device *dev) 2435 { 2436 struct in6_addr addr; 2437 struct inet6_dev * idev; 2438 2439 ASSERT_RTNL(); 2440 2441 if ((dev->type != ARPHRD_ETHER) && 2442 (dev->type != ARPHRD_FDDI) && 2443 (dev->type != ARPHRD_IEEE802_TR) && 2444 (dev->type != ARPHRD_ARCNET) && 2445 (dev->type != ARPHRD_INFINIBAND)) { 2446 /* Alas, we support only Ethernet autoconfiguration. */ 2447 return; 2448 } 2449 2450 idev = addrconf_add_dev(dev); 2451 if (IS_ERR(idev)) 2452 return; 2453 2454 memset(&addr, 0, sizeof(struct in6_addr)); 2455 addr.s6_addr32[0] = htonl(0xFE800000); 2456 2457 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2458 addrconf_add_linklocal(idev, &addr); 2459 } 2460 2461 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2462 static void addrconf_sit_config(struct net_device *dev) 2463 { 2464 struct inet6_dev *idev; 2465 2466 ASSERT_RTNL(); 2467 2468 /* 2469 * Configure the tunnel with one of our IPv4 2470 * addresses... we should configure all of 2471 * our v4 addrs in the tunnel 2472 */ 2473 2474 if ((idev = ipv6_find_idev(dev)) == NULL) { 2475 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2476 return; 2477 } 2478 2479 if (dev->priv_flags & IFF_ISATAP) { 2480 struct in6_addr addr; 2481 2482 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2483 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2484 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2485 addrconf_add_linklocal(idev, &addr); 2486 return; 2487 } 2488 2489 sit_add_v4_addrs(idev); 2490 2491 if (dev->flags&IFF_POINTOPOINT) { 2492 addrconf_add_mroute(dev); 2493 addrconf_add_lroute(dev); 2494 } else 2495 sit_route_add(dev); 2496 } 2497 #endif 2498 2499 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2500 static void addrconf_gre_config(struct net_device *dev) 2501 { 2502 struct inet6_dev *idev; 2503 struct in6_addr addr; 2504 2505 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name); 2506 2507 ASSERT_RTNL(); 2508 2509 if ((idev = ipv6_find_idev(dev)) == NULL) { 2510 printk(KERN_DEBUG "init gre: add_dev failed\n"); 2511 return; 2512 } 2513 2514 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2515 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2516 2517 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2518 addrconf_add_linklocal(idev, &addr); 2519 } 2520 #endif 2521 2522 static inline int 2523 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2524 { 2525 struct in6_addr lladdr; 2526 2527 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2528 addrconf_add_linklocal(idev, &lladdr); 2529 return 0; 2530 } 2531 return -1; 2532 } 2533 2534 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2535 { 2536 struct net_device *link_dev; 2537 struct net *net = dev_net(idev->dev); 2538 2539 /* first try to inherit the link-local address from the link device */ 2540 if (idev->dev->iflink && 2541 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2542 if (!ipv6_inherit_linklocal(idev, link_dev)) 2543 return; 2544 } 2545 /* then try to inherit it from any device */ 2546 for_each_netdev(net, link_dev) { 2547 if (!ipv6_inherit_linklocal(idev, link_dev)) 2548 return; 2549 } 2550 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2551 } 2552 2553 /* 2554 * Autoconfigure tunnel with a link-local address so routing protocols, 2555 * DHCPv6, MLD etc. can be run over the virtual link 2556 */ 2557 2558 static void addrconf_ip6_tnl_config(struct net_device *dev) 2559 { 2560 struct inet6_dev *idev; 2561 2562 ASSERT_RTNL(); 2563 2564 idev = addrconf_add_dev(dev); 2565 if (IS_ERR(idev)) { 2566 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2567 return; 2568 } 2569 ip6_tnl_add_linklocal(idev); 2570 } 2571 2572 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2573 void * data) 2574 { 2575 struct net_device *dev = (struct net_device *) data; 2576 struct inet6_dev *idev = __in6_dev_get(dev); 2577 int run_pending = 0; 2578 int err; 2579 2580 switch (event) { 2581 case NETDEV_REGISTER: 2582 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2583 idev = ipv6_add_dev(dev); 2584 if (!idev) 2585 return notifier_from_errno(-ENOMEM); 2586 } 2587 break; 2588 2589 case NETDEV_UP: 2590 case NETDEV_CHANGE: 2591 if (dev->flags & IFF_SLAVE) 2592 break; 2593 2594 if (event == NETDEV_UP) { 2595 if (!addrconf_qdisc_ok(dev)) { 2596 /* device is not ready yet. */ 2597 printk(KERN_INFO 2598 "ADDRCONF(NETDEV_UP): %s: " 2599 "link is not ready\n", 2600 dev->name); 2601 break; 2602 } 2603 2604 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2605 idev = ipv6_add_dev(dev); 2606 2607 if (idev) { 2608 idev->if_flags |= IF_READY; 2609 run_pending = 1; 2610 } 2611 } else { 2612 if (!addrconf_qdisc_ok(dev)) { 2613 /* device is still not ready. */ 2614 break; 2615 } 2616 2617 if (idev) { 2618 if (idev->if_flags & IF_READY) 2619 /* device is already configured. */ 2620 break; 2621 idev->if_flags |= IF_READY; 2622 } 2623 2624 printk(KERN_INFO 2625 "ADDRCONF(NETDEV_CHANGE): %s: " 2626 "link becomes ready\n", 2627 dev->name); 2628 2629 run_pending = 1; 2630 } 2631 2632 switch (dev->type) { 2633 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2634 case ARPHRD_SIT: 2635 addrconf_sit_config(dev); 2636 break; 2637 #endif 2638 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2639 case ARPHRD_IPGRE: 2640 addrconf_gre_config(dev); 2641 break; 2642 #endif 2643 case ARPHRD_TUNNEL6: 2644 addrconf_ip6_tnl_config(dev); 2645 break; 2646 case ARPHRD_LOOPBACK: 2647 init_loopback(dev); 2648 break; 2649 2650 default: 2651 addrconf_dev_config(dev); 2652 break; 2653 } 2654 2655 if (idev) { 2656 if (run_pending) 2657 addrconf_dad_run(idev); 2658 2659 /* 2660 * If the MTU changed during the interface down, 2661 * when the interface up, the changed MTU must be 2662 * reflected in the idev as well as routers. 2663 */ 2664 if (idev->cnf.mtu6 != dev->mtu && 2665 dev->mtu >= IPV6_MIN_MTU) { 2666 rt6_mtu_change(dev, dev->mtu); 2667 idev->cnf.mtu6 = dev->mtu; 2668 } 2669 idev->tstamp = jiffies; 2670 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2671 2672 /* 2673 * If the changed mtu during down is lower than 2674 * IPV6_MIN_MTU stop IPv6 on this interface. 2675 */ 2676 if (dev->mtu < IPV6_MIN_MTU) 2677 addrconf_ifdown(dev, 1); 2678 } 2679 break; 2680 2681 case NETDEV_CHANGEMTU: 2682 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2683 rt6_mtu_change(dev, dev->mtu); 2684 idev->cnf.mtu6 = dev->mtu; 2685 break; 2686 } 2687 2688 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2689 idev = ipv6_add_dev(dev); 2690 if (idev) 2691 break; 2692 } 2693 2694 /* 2695 * MTU falled under IPV6_MIN_MTU. 2696 * Stop IPv6 on this interface. 2697 */ 2698 2699 case NETDEV_DOWN: 2700 case NETDEV_UNREGISTER: 2701 /* 2702 * Remove all addresses from this interface. 2703 */ 2704 addrconf_ifdown(dev, event != NETDEV_DOWN); 2705 break; 2706 2707 case NETDEV_CHANGENAME: 2708 if (idev) { 2709 snmp6_unregister_dev(idev); 2710 addrconf_sysctl_unregister(idev); 2711 addrconf_sysctl_register(idev); 2712 err = snmp6_register_dev(idev); 2713 if (err) 2714 return notifier_from_errno(err); 2715 } 2716 break; 2717 2718 case NETDEV_PRE_TYPE_CHANGE: 2719 case NETDEV_POST_TYPE_CHANGE: 2720 addrconf_type_change(dev, event); 2721 break; 2722 } 2723 2724 return NOTIFY_OK; 2725 } 2726 2727 /* 2728 * addrconf module should be notified of a device going up 2729 */ 2730 static struct notifier_block ipv6_dev_notf = { 2731 .notifier_call = addrconf_notify, 2732 }; 2733 2734 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2735 { 2736 struct inet6_dev *idev; 2737 ASSERT_RTNL(); 2738 2739 idev = __in6_dev_get(dev); 2740 2741 if (event == NETDEV_POST_TYPE_CHANGE) 2742 ipv6_mc_remap(idev); 2743 else if (event == NETDEV_PRE_TYPE_CHANGE) 2744 ipv6_mc_unmap(idev); 2745 } 2746 2747 static int addrconf_ifdown(struct net_device *dev, int how) 2748 { 2749 struct net *net = dev_net(dev); 2750 struct inet6_dev *idev; 2751 struct inet6_ifaddr *ifa; 2752 int state, i; 2753 2754 ASSERT_RTNL(); 2755 2756 rt6_ifdown(net, dev); 2757 neigh_ifdown(&nd_tbl, dev); 2758 2759 idev = __in6_dev_get(dev); 2760 if (idev == NULL) 2761 return -ENODEV; 2762 2763 /* 2764 * Step 1: remove reference to ipv6 device from parent device. 2765 * Do not dev_put! 2766 */ 2767 if (how) { 2768 idev->dead = 1; 2769 2770 /* protected by rtnl_lock */ 2771 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2772 2773 /* Step 1.5: remove snmp6 entry */ 2774 snmp6_unregister_dev(idev); 2775 2776 } 2777 2778 /* Step 2: clear hash table */ 2779 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2780 struct hlist_head *h = &inet6_addr_lst[i]; 2781 struct hlist_node *n; 2782 2783 spin_lock_bh(&addrconf_hash_lock); 2784 restart: 2785 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2786 if (ifa->idev == idev) { 2787 hlist_del_init_rcu(&ifa->addr_lst); 2788 addrconf_del_timer(ifa); 2789 goto restart; 2790 } 2791 } 2792 spin_unlock_bh(&addrconf_hash_lock); 2793 } 2794 2795 write_lock_bh(&idev->lock); 2796 2797 /* Step 2: clear flags for stateless addrconf */ 2798 if (!how) 2799 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2800 2801 #ifdef CONFIG_IPV6_PRIVACY 2802 if (how && del_timer(&idev->regen_timer)) 2803 in6_dev_put(idev); 2804 2805 /* Step 3: clear tempaddr list */ 2806 while (!list_empty(&idev->tempaddr_list)) { 2807 ifa = list_first_entry(&idev->tempaddr_list, 2808 struct inet6_ifaddr, tmp_list); 2809 list_del(&ifa->tmp_list); 2810 write_unlock_bh(&idev->lock); 2811 spin_lock_bh(&ifa->lock); 2812 2813 if (ifa->ifpub) { 2814 in6_ifa_put(ifa->ifpub); 2815 ifa->ifpub = NULL; 2816 } 2817 spin_unlock_bh(&ifa->lock); 2818 in6_ifa_put(ifa); 2819 write_lock_bh(&idev->lock); 2820 } 2821 #endif 2822 2823 while (!list_empty(&idev->addr_list)) { 2824 ifa = list_first_entry(&idev->addr_list, 2825 struct inet6_ifaddr, if_list); 2826 addrconf_del_timer(ifa); 2827 2828 list_del(&ifa->if_list); 2829 2830 write_unlock_bh(&idev->lock); 2831 2832 spin_lock_bh(&ifa->state_lock); 2833 state = ifa->state; 2834 ifa->state = INET6_IFADDR_STATE_DEAD; 2835 spin_unlock_bh(&ifa->state_lock); 2836 2837 if (state != INET6_IFADDR_STATE_DEAD) { 2838 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2839 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2840 } 2841 in6_ifa_put(ifa); 2842 2843 write_lock_bh(&idev->lock); 2844 } 2845 2846 write_unlock_bh(&idev->lock); 2847 2848 /* Step 5: Discard multicast list */ 2849 if (how) 2850 ipv6_mc_destroy_dev(idev); 2851 else 2852 ipv6_mc_down(idev); 2853 2854 idev->tstamp = jiffies; 2855 2856 /* Last: Shot the device (if unregistered) */ 2857 if (how) { 2858 addrconf_sysctl_unregister(idev); 2859 neigh_parms_release(&nd_tbl, idev->nd_parms); 2860 neigh_ifdown(&nd_tbl, dev); 2861 in6_dev_put(idev); 2862 } 2863 return 0; 2864 } 2865 2866 static void addrconf_rs_timer(unsigned long data) 2867 { 2868 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2869 struct inet6_dev *idev = ifp->idev; 2870 2871 read_lock(&idev->lock); 2872 if (idev->dead || !(idev->if_flags & IF_READY)) 2873 goto out; 2874 2875 if (idev->cnf.forwarding) 2876 goto out; 2877 2878 /* Announcement received after solicitation was sent */ 2879 if (idev->if_flags & IF_RA_RCVD) 2880 goto out; 2881 2882 spin_lock(&ifp->lock); 2883 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2884 /* The wait after the last probe can be shorter */ 2885 addrconf_mod_timer(ifp, AC_RS, 2886 (ifp->probes == idev->cnf.rtr_solicits) ? 2887 idev->cnf.rtr_solicit_delay : 2888 idev->cnf.rtr_solicit_interval); 2889 spin_unlock(&ifp->lock); 2890 2891 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2892 } else { 2893 spin_unlock(&ifp->lock); 2894 /* 2895 * Note: we do not support deprecated "all on-link" 2896 * assumption any longer. 2897 */ 2898 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2899 idev->dev->name); 2900 } 2901 2902 out: 2903 read_unlock(&idev->lock); 2904 in6_ifa_put(ifp); 2905 } 2906 2907 /* 2908 * Duplicate Address Detection 2909 */ 2910 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2911 { 2912 unsigned long rand_num; 2913 struct inet6_dev *idev = ifp->idev; 2914 2915 if (ifp->flags & IFA_F_OPTIMISTIC) 2916 rand_num = 0; 2917 else 2918 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2919 2920 ifp->probes = idev->cnf.dad_transmits; 2921 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2922 } 2923 2924 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2925 { 2926 struct inet6_dev *idev = ifp->idev; 2927 struct net_device *dev = idev->dev; 2928 2929 addrconf_join_solict(dev, &ifp->addr); 2930 2931 net_srandom(ifp->addr.s6_addr32[3]); 2932 2933 read_lock_bh(&idev->lock); 2934 spin_lock(&ifp->lock); 2935 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2936 goto out; 2937 2938 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2939 idev->cnf.accept_dad < 1 || 2940 !(ifp->flags&IFA_F_TENTATIVE) || 2941 ifp->flags & IFA_F_NODAD) { 2942 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2943 spin_unlock(&ifp->lock); 2944 read_unlock_bh(&idev->lock); 2945 2946 addrconf_dad_completed(ifp); 2947 return; 2948 } 2949 2950 if (!(idev->if_flags & IF_READY)) { 2951 spin_unlock(&ifp->lock); 2952 read_unlock_bh(&idev->lock); 2953 /* 2954 * If the device is not ready: 2955 * - keep it tentative if it is a permanent address. 2956 * - otherwise, kill it. 2957 */ 2958 in6_ifa_hold(ifp); 2959 addrconf_dad_stop(ifp, 0); 2960 return; 2961 } 2962 2963 /* 2964 * Optimistic nodes can start receiving 2965 * Frames right away 2966 */ 2967 if (ifp->flags & IFA_F_OPTIMISTIC) 2968 ip6_ins_rt(ifp->rt); 2969 2970 addrconf_dad_kick(ifp); 2971 out: 2972 spin_unlock(&ifp->lock); 2973 read_unlock_bh(&idev->lock); 2974 } 2975 2976 static void addrconf_dad_timer(unsigned long data) 2977 { 2978 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2979 struct inet6_dev *idev = ifp->idev; 2980 struct in6_addr mcaddr; 2981 2982 if (!ifp->probes && addrconf_dad_end(ifp)) 2983 goto out; 2984 2985 read_lock(&idev->lock); 2986 if (idev->dead || !(idev->if_flags & IF_READY)) { 2987 read_unlock(&idev->lock); 2988 goto out; 2989 } 2990 2991 spin_lock(&ifp->lock); 2992 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2993 spin_unlock(&ifp->lock); 2994 read_unlock(&idev->lock); 2995 goto out; 2996 } 2997 2998 if (ifp->probes == 0) { 2999 /* 3000 * DAD was successful 3001 */ 3002 3003 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3004 spin_unlock(&ifp->lock); 3005 read_unlock(&idev->lock); 3006 3007 addrconf_dad_completed(ifp); 3008 3009 goto out; 3010 } 3011 3012 ifp->probes--; 3013 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3014 spin_unlock(&ifp->lock); 3015 read_unlock(&idev->lock); 3016 3017 /* send a neighbour solicitation for our addr */ 3018 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3019 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3020 out: 3021 in6_ifa_put(ifp); 3022 } 3023 3024 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3025 { 3026 struct net_device *dev = ifp->idev->dev; 3027 3028 /* 3029 * Configure the address for reception. Now it is valid. 3030 */ 3031 3032 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3033 3034 /* If added prefix is link local and we are prepared to process 3035 router advertisements, start sending router solicitations. 3036 */ 3037 3038 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) || 3039 ifp->idev->cnf.accept_ra == 2) && 3040 ifp->idev->cnf.rtr_solicits > 0 && 3041 (dev->flags&IFF_LOOPBACK) == 0 && 3042 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3043 /* 3044 * If a host as already performed a random delay 3045 * [...] as part of DAD [...] there is no need 3046 * to delay again before sending the first RS 3047 */ 3048 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3049 3050 spin_lock_bh(&ifp->lock); 3051 ifp->probes = 1; 3052 ifp->idev->if_flags |= IF_RS_SENT; 3053 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3054 spin_unlock_bh(&ifp->lock); 3055 } 3056 } 3057 3058 static void addrconf_dad_run(struct inet6_dev *idev) 3059 { 3060 struct inet6_ifaddr *ifp; 3061 3062 read_lock_bh(&idev->lock); 3063 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3064 spin_lock(&ifp->lock); 3065 if (ifp->flags & IFA_F_TENTATIVE && 3066 ifp->state == INET6_IFADDR_STATE_DAD) 3067 addrconf_dad_kick(ifp); 3068 spin_unlock(&ifp->lock); 3069 } 3070 read_unlock_bh(&idev->lock); 3071 } 3072 3073 #ifdef CONFIG_PROC_FS 3074 struct if6_iter_state { 3075 struct seq_net_private p; 3076 int bucket; 3077 int offset; 3078 }; 3079 3080 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3081 { 3082 struct inet6_ifaddr *ifa = NULL; 3083 struct if6_iter_state *state = seq->private; 3084 struct net *net = seq_file_net(seq); 3085 int p = 0; 3086 3087 /* initial bucket if pos is 0 */ 3088 if (pos == 0) { 3089 state->bucket = 0; 3090 state->offset = 0; 3091 } 3092 3093 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3094 struct hlist_node *n; 3095 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3096 addr_lst) { 3097 /* sync with offset */ 3098 if (p < state->offset) { 3099 p++; 3100 continue; 3101 } 3102 state->offset++; 3103 if (net_eq(dev_net(ifa->idev->dev), net)) 3104 return ifa; 3105 } 3106 3107 /* prepare for next bucket */ 3108 state->offset = 0; 3109 p = 0; 3110 } 3111 return NULL; 3112 } 3113 3114 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3115 struct inet6_ifaddr *ifa) 3116 { 3117 struct if6_iter_state *state = seq->private; 3118 struct net *net = seq_file_net(seq); 3119 struct hlist_node *n = &ifa->addr_lst; 3120 3121 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) { 3122 state->offset++; 3123 if (net_eq(dev_net(ifa->idev->dev), net)) 3124 return ifa; 3125 } 3126 3127 while (++state->bucket < IN6_ADDR_HSIZE) { 3128 state->offset = 0; 3129 hlist_for_each_entry_rcu_bh(ifa, n, 3130 &inet6_addr_lst[state->bucket], addr_lst) { 3131 state->offset++; 3132 if (net_eq(dev_net(ifa->idev->dev), net)) 3133 return ifa; 3134 } 3135 } 3136 3137 return NULL; 3138 } 3139 3140 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3141 __acquires(rcu_bh) 3142 { 3143 rcu_read_lock_bh(); 3144 return if6_get_first(seq, *pos); 3145 } 3146 3147 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3148 { 3149 struct inet6_ifaddr *ifa; 3150 3151 ifa = if6_get_next(seq, v); 3152 ++*pos; 3153 return ifa; 3154 } 3155 3156 static void if6_seq_stop(struct seq_file *seq, void *v) 3157 __releases(rcu_bh) 3158 { 3159 rcu_read_unlock_bh(); 3160 } 3161 3162 static int if6_seq_show(struct seq_file *seq, void *v) 3163 { 3164 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3165 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3166 &ifp->addr, 3167 ifp->idev->dev->ifindex, 3168 ifp->prefix_len, 3169 ifp->scope, 3170 ifp->flags, 3171 ifp->idev->dev->name); 3172 return 0; 3173 } 3174 3175 static const struct seq_operations if6_seq_ops = { 3176 .start = if6_seq_start, 3177 .next = if6_seq_next, 3178 .show = if6_seq_show, 3179 .stop = if6_seq_stop, 3180 }; 3181 3182 static int if6_seq_open(struct inode *inode, struct file *file) 3183 { 3184 return seq_open_net(inode, file, &if6_seq_ops, 3185 sizeof(struct if6_iter_state)); 3186 } 3187 3188 static const struct file_operations if6_fops = { 3189 .owner = THIS_MODULE, 3190 .open = if6_seq_open, 3191 .read = seq_read, 3192 .llseek = seq_lseek, 3193 .release = seq_release_net, 3194 }; 3195 3196 static int __net_init if6_proc_net_init(struct net *net) 3197 { 3198 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3199 return -ENOMEM; 3200 return 0; 3201 } 3202 3203 static void __net_exit if6_proc_net_exit(struct net *net) 3204 { 3205 proc_net_remove(net, "if_inet6"); 3206 } 3207 3208 static struct pernet_operations if6_proc_net_ops = { 3209 .init = if6_proc_net_init, 3210 .exit = if6_proc_net_exit, 3211 }; 3212 3213 int __init if6_proc_init(void) 3214 { 3215 return register_pernet_subsys(&if6_proc_net_ops); 3216 } 3217 3218 void if6_proc_exit(void) 3219 { 3220 unregister_pernet_subsys(&if6_proc_net_ops); 3221 } 3222 #endif /* CONFIG_PROC_FS */ 3223 3224 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3225 /* Check if address is a home address configured on any interface. */ 3226 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3227 { 3228 int ret = 0; 3229 struct inet6_ifaddr *ifp = NULL; 3230 struct hlist_node *n; 3231 unsigned int hash = ipv6_addr_hash(addr); 3232 3233 rcu_read_lock_bh(); 3234 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3235 if (!net_eq(dev_net(ifp->idev->dev), net)) 3236 continue; 3237 if (ipv6_addr_equal(&ifp->addr, addr) && 3238 (ifp->flags & IFA_F_HOMEADDRESS)) { 3239 ret = 1; 3240 break; 3241 } 3242 } 3243 rcu_read_unlock_bh(); 3244 return ret; 3245 } 3246 #endif 3247 3248 /* 3249 * Periodic address status verification 3250 */ 3251 3252 static void addrconf_verify(unsigned long foo) 3253 { 3254 unsigned long now, next, next_sec, next_sched; 3255 struct inet6_ifaddr *ifp; 3256 struct hlist_node *node; 3257 int i; 3258 3259 rcu_read_lock_bh(); 3260 spin_lock(&addrconf_verify_lock); 3261 now = jiffies; 3262 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3263 3264 del_timer(&addr_chk_timer); 3265 3266 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3267 restart: 3268 hlist_for_each_entry_rcu_bh(ifp, node, 3269 &inet6_addr_lst[i], addr_lst) { 3270 unsigned long age; 3271 3272 if (ifp->flags & IFA_F_PERMANENT) 3273 continue; 3274 3275 spin_lock(&ifp->lock); 3276 /* We try to batch several events at once. */ 3277 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3278 3279 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3280 age >= ifp->valid_lft) { 3281 spin_unlock(&ifp->lock); 3282 in6_ifa_hold(ifp); 3283 ipv6_del_addr(ifp); 3284 goto restart; 3285 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3286 spin_unlock(&ifp->lock); 3287 continue; 3288 } else if (age >= ifp->prefered_lft) { 3289 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3290 int deprecate = 0; 3291 3292 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3293 deprecate = 1; 3294 ifp->flags |= IFA_F_DEPRECATED; 3295 } 3296 3297 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3298 next = ifp->tstamp + ifp->valid_lft * HZ; 3299 3300 spin_unlock(&ifp->lock); 3301 3302 if (deprecate) { 3303 in6_ifa_hold(ifp); 3304 3305 ipv6_ifa_notify(0, ifp); 3306 in6_ifa_put(ifp); 3307 goto restart; 3308 } 3309 #ifdef CONFIG_IPV6_PRIVACY 3310 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3311 !(ifp->flags&IFA_F_TENTATIVE)) { 3312 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3313 ifp->idev->cnf.dad_transmits * 3314 ifp->idev->nd_parms->retrans_time / HZ; 3315 3316 if (age >= ifp->prefered_lft - regen_advance) { 3317 struct inet6_ifaddr *ifpub = ifp->ifpub; 3318 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3319 next = ifp->tstamp + ifp->prefered_lft * HZ; 3320 if (!ifp->regen_count && ifpub) { 3321 ifp->regen_count++; 3322 in6_ifa_hold(ifp); 3323 in6_ifa_hold(ifpub); 3324 spin_unlock(&ifp->lock); 3325 3326 spin_lock(&ifpub->lock); 3327 ifpub->regen_count = 0; 3328 spin_unlock(&ifpub->lock); 3329 ipv6_create_tempaddr(ifpub, ifp); 3330 in6_ifa_put(ifpub); 3331 in6_ifa_put(ifp); 3332 goto restart; 3333 } 3334 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3335 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3336 spin_unlock(&ifp->lock); 3337 #endif 3338 } else { 3339 /* ifp->prefered_lft <= ifp->valid_lft */ 3340 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3341 next = ifp->tstamp + ifp->prefered_lft * HZ; 3342 spin_unlock(&ifp->lock); 3343 } 3344 } 3345 } 3346 3347 next_sec = round_jiffies_up(next); 3348 next_sched = next; 3349 3350 /* If rounded timeout is accurate enough, accept it. */ 3351 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3352 next_sched = next_sec; 3353 3354 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3355 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3356 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3357 3358 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3359 now, next, next_sec, next_sched)); 3360 3361 addr_chk_timer.expires = next_sched; 3362 add_timer(&addr_chk_timer); 3363 spin_unlock(&addrconf_verify_lock); 3364 rcu_read_unlock_bh(); 3365 } 3366 3367 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3368 { 3369 struct in6_addr *pfx = NULL; 3370 3371 if (addr) 3372 pfx = nla_data(addr); 3373 3374 if (local) { 3375 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3376 pfx = NULL; 3377 else 3378 pfx = nla_data(local); 3379 } 3380 3381 return pfx; 3382 } 3383 3384 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3385 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3386 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3387 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3388 }; 3389 3390 static int 3391 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3392 { 3393 struct net *net = sock_net(skb->sk); 3394 struct ifaddrmsg *ifm; 3395 struct nlattr *tb[IFA_MAX+1]; 3396 struct in6_addr *pfx; 3397 int err; 3398 3399 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3400 if (err < 0) 3401 return err; 3402 3403 ifm = nlmsg_data(nlh); 3404 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3405 if (pfx == NULL) 3406 return -EINVAL; 3407 3408 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3409 } 3410 3411 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3412 u32 prefered_lft, u32 valid_lft) 3413 { 3414 u32 flags; 3415 clock_t expires; 3416 unsigned long timeout; 3417 3418 if (!valid_lft || (prefered_lft > valid_lft)) 3419 return -EINVAL; 3420 3421 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3422 if (addrconf_finite_timeout(timeout)) { 3423 expires = jiffies_to_clock_t(timeout * HZ); 3424 valid_lft = timeout; 3425 flags = RTF_EXPIRES; 3426 } else { 3427 expires = 0; 3428 flags = 0; 3429 ifa_flags |= IFA_F_PERMANENT; 3430 } 3431 3432 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3433 if (addrconf_finite_timeout(timeout)) { 3434 if (timeout == 0) 3435 ifa_flags |= IFA_F_DEPRECATED; 3436 prefered_lft = timeout; 3437 } 3438 3439 spin_lock_bh(&ifp->lock); 3440 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3441 ifp->tstamp = jiffies; 3442 ifp->valid_lft = valid_lft; 3443 ifp->prefered_lft = prefered_lft; 3444 3445 spin_unlock_bh(&ifp->lock); 3446 if (!(ifp->flags&IFA_F_TENTATIVE)) 3447 ipv6_ifa_notify(0, ifp); 3448 3449 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3450 expires, flags); 3451 addrconf_verify(0); 3452 3453 return 0; 3454 } 3455 3456 static int 3457 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3458 { 3459 struct net *net = sock_net(skb->sk); 3460 struct ifaddrmsg *ifm; 3461 struct nlattr *tb[IFA_MAX+1]; 3462 struct in6_addr *pfx; 3463 struct inet6_ifaddr *ifa; 3464 struct net_device *dev; 3465 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3466 u8 ifa_flags; 3467 int err; 3468 3469 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3470 if (err < 0) 3471 return err; 3472 3473 ifm = nlmsg_data(nlh); 3474 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3475 if (pfx == NULL) 3476 return -EINVAL; 3477 3478 if (tb[IFA_CACHEINFO]) { 3479 struct ifa_cacheinfo *ci; 3480 3481 ci = nla_data(tb[IFA_CACHEINFO]); 3482 valid_lft = ci->ifa_valid; 3483 preferred_lft = ci->ifa_prefered; 3484 } else { 3485 preferred_lft = INFINITY_LIFE_TIME; 3486 valid_lft = INFINITY_LIFE_TIME; 3487 } 3488 3489 dev = __dev_get_by_index(net, ifm->ifa_index); 3490 if (dev == NULL) 3491 return -ENODEV; 3492 3493 /* We ignore other flags so far. */ 3494 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3495 3496 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3497 if (ifa == NULL) { 3498 /* 3499 * It would be best to check for !NLM_F_CREATE here but 3500 * userspace alreay relies on not having to provide this. 3501 */ 3502 return inet6_addr_add(net, ifm->ifa_index, pfx, 3503 ifm->ifa_prefixlen, ifa_flags, 3504 preferred_lft, valid_lft); 3505 } 3506 3507 if (nlh->nlmsg_flags & NLM_F_EXCL || 3508 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3509 err = -EEXIST; 3510 else 3511 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3512 3513 in6_ifa_put(ifa); 3514 3515 return err; 3516 } 3517 3518 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3519 u8 scope, int ifindex) 3520 { 3521 struct ifaddrmsg *ifm; 3522 3523 ifm = nlmsg_data(nlh); 3524 ifm->ifa_family = AF_INET6; 3525 ifm->ifa_prefixlen = prefixlen; 3526 ifm->ifa_flags = flags; 3527 ifm->ifa_scope = scope; 3528 ifm->ifa_index = ifindex; 3529 } 3530 3531 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3532 unsigned long tstamp, u32 preferred, u32 valid) 3533 { 3534 struct ifa_cacheinfo ci; 3535 3536 ci.cstamp = cstamp_delta(cstamp); 3537 ci.tstamp = cstamp_delta(tstamp); 3538 ci.ifa_prefered = preferred; 3539 ci.ifa_valid = valid; 3540 3541 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3542 } 3543 3544 static inline int rt_scope(int ifa_scope) 3545 { 3546 if (ifa_scope & IFA_HOST) 3547 return RT_SCOPE_HOST; 3548 else if (ifa_scope & IFA_LINK) 3549 return RT_SCOPE_LINK; 3550 else if (ifa_scope & IFA_SITE) 3551 return RT_SCOPE_SITE; 3552 else 3553 return RT_SCOPE_UNIVERSE; 3554 } 3555 3556 static inline int inet6_ifaddr_msgsize(void) 3557 { 3558 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3559 + nla_total_size(16) /* IFA_ADDRESS */ 3560 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3561 } 3562 3563 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3564 u32 pid, u32 seq, int event, unsigned int flags) 3565 { 3566 struct nlmsghdr *nlh; 3567 u32 preferred, valid; 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, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3574 ifa->idev->dev->ifindex); 3575 3576 if (!(ifa->flags&IFA_F_PERMANENT)) { 3577 preferred = ifa->prefered_lft; 3578 valid = ifa->valid_lft; 3579 if (preferred != INFINITY_LIFE_TIME) { 3580 long tval = (jiffies - ifa->tstamp)/HZ; 3581 if (preferred > tval) 3582 preferred -= tval; 3583 else 3584 preferred = 0; 3585 if (valid != INFINITY_LIFE_TIME) { 3586 if (valid > tval) 3587 valid -= tval; 3588 else 3589 valid = 0; 3590 } 3591 } 3592 } else { 3593 preferred = INFINITY_LIFE_TIME; 3594 valid = INFINITY_LIFE_TIME; 3595 } 3596 3597 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3598 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3599 nlmsg_cancel(skb, nlh); 3600 return -EMSGSIZE; 3601 } 3602 3603 return nlmsg_end(skb, nlh); 3604 } 3605 3606 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3607 u32 pid, u32 seq, int event, u16 flags) 3608 { 3609 struct nlmsghdr *nlh; 3610 u8 scope = RT_SCOPE_UNIVERSE; 3611 int ifindex = ifmca->idev->dev->ifindex; 3612 3613 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3614 scope = RT_SCOPE_SITE; 3615 3616 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3617 if (nlh == NULL) 3618 return -EMSGSIZE; 3619 3620 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3621 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3622 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3623 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3624 nlmsg_cancel(skb, nlh); 3625 return -EMSGSIZE; 3626 } 3627 3628 return nlmsg_end(skb, nlh); 3629 } 3630 3631 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3632 u32 pid, u32 seq, int event, unsigned int flags) 3633 { 3634 struct nlmsghdr *nlh; 3635 u8 scope = RT_SCOPE_UNIVERSE; 3636 int ifindex = ifaca->aca_idev->dev->ifindex; 3637 3638 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3639 scope = RT_SCOPE_SITE; 3640 3641 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3642 if (nlh == NULL) 3643 return -EMSGSIZE; 3644 3645 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3646 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3647 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3648 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3649 nlmsg_cancel(skb, nlh); 3650 return -EMSGSIZE; 3651 } 3652 3653 return nlmsg_end(skb, nlh); 3654 } 3655 3656 enum addr_type_t { 3657 UNICAST_ADDR, 3658 MULTICAST_ADDR, 3659 ANYCAST_ADDR, 3660 }; 3661 3662 /* called with rcu_read_lock() */ 3663 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3664 struct netlink_callback *cb, enum addr_type_t type, 3665 int s_ip_idx, int *p_ip_idx) 3666 { 3667 struct ifmcaddr6 *ifmca; 3668 struct ifacaddr6 *ifaca; 3669 int err = 1; 3670 int ip_idx = *p_ip_idx; 3671 3672 read_lock_bh(&idev->lock); 3673 switch (type) { 3674 case UNICAST_ADDR: { 3675 struct inet6_ifaddr *ifa; 3676 3677 /* unicast address incl. temp addr */ 3678 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3679 if (++ip_idx < s_ip_idx) 3680 continue; 3681 err = inet6_fill_ifaddr(skb, ifa, 3682 NETLINK_CB(cb->skb).pid, 3683 cb->nlh->nlmsg_seq, 3684 RTM_NEWADDR, 3685 NLM_F_MULTI); 3686 if (err <= 0) 3687 break; 3688 } 3689 break; 3690 } 3691 case MULTICAST_ADDR: 3692 /* multicast address */ 3693 for (ifmca = idev->mc_list; ifmca; 3694 ifmca = ifmca->next, ip_idx++) { 3695 if (ip_idx < s_ip_idx) 3696 continue; 3697 err = inet6_fill_ifmcaddr(skb, ifmca, 3698 NETLINK_CB(cb->skb).pid, 3699 cb->nlh->nlmsg_seq, 3700 RTM_GETMULTICAST, 3701 NLM_F_MULTI); 3702 if (err <= 0) 3703 break; 3704 } 3705 break; 3706 case ANYCAST_ADDR: 3707 /* anycast address */ 3708 for (ifaca = idev->ac_list; ifaca; 3709 ifaca = ifaca->aca_next, ip_idx++) { 3710 if (ip_idx < s_ip_idx) 3711 continue; 3712 err = inet6_fill_ifacaddr(skb, ifaca, 3713 NETLINK_CB(cb->skb).pid, 3714 cb->nlh->nlmsg_seq, 3715 RTM_GETANYCAST, 3716 NLM_F_MULTI); 3717 if (err <= 0) 3718 break; 3719 } 3720 break; 3721 default: 3722 break; 3723 } 3724 read_unlock_bh(&idev->lock); 3725 *p_ip_idx = ip_idx; 3726 return err; 3727 } 3728 3729 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3730 enum addr_type_t type) 3731 { 3732 struct net *net = sock_net(skb->sk); 3733 int h, s_h; 3734 int idx, ip_idx; 3735 int s_idx, s_ip_idx; 3736 struct net_device *dev; 3737 struct inet6_dev *idev; 3738 struct hlist_head *head; 3739 struct hlist_node *node; 3740 3741 s_h = cb->args[0]; 3742 s_idx = idx = cb->args[1]; 3743 s_ip_idx = ip_idx = cb->args[2]; 3744 3745 rcu_read_lock(); 3746 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3747 idx = 0; 3748 head = &net->dev_index_head[h]; 3749 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3750 if (idx < s_idx) 3751 goto cont; 3752 if (h > s_h || idx > s_idx) 3753 s_ip_idx = 0; 3754 ip_idx = 0; 3755 idev = __in6_dev_get(dev); 3756 if (!idev) 3757 goto cont; 3758 3759 if (in6_dump_addrs(idev, skb, cb, type, 3760 s_ip_idx, &ip_idx) <= 0) 3761 goto done; 3762 cont: 3763 idx++; 3764 } 3765 } 3766 done: 3767 rcu_read_unlock(); 3768 cb->args[0] = h; 3769 cb->args[1] = idx; 3770 cb->args[2] = ip_idx; 3771 3772 return skb->len; 3773 } 3774 3775 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3776 { 3777 enum addr_type_t type = UNICAST_ADDR; 3778 3779 return inet6_dump_addr(skb, cb, type); 3780 } 3781 3782 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3783 { 3784 enum addr_type_t type = MULTICAST_ADDR; 3785 3786 return inet6_dump_addr(skb, cb, type); 3787 } 3788 3789 3790 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3791 { 3792 enum addr_type_t type = ANYCAST_ADDR; 3793 3794 return inet6_dump_addr(skb, cb, type); 3795 } 3796 3797 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3798 void *arg) 3799 { 3800 struct net *net = sock_net(in_skb->sk); 3801 struct ifaddrmsg *ifm; 3802 struct nlattr *tb[IFA_MAX+1]; 3803 struct in6_addr *addr = NULL; 3804 struct net_device *dev = NULL; 3805 struct inet6_ifaddr *ifa; 3806 struct sk_buff *skb; 3807 int err; 3808 3809 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3810 if (err < 0) 3811 goto errout; 3812 3813 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3814 if (addr == NULL) { 3815 err = -EINVAL; 3816 goto errout; 3817 } 3818 3819 ifm = nlmsg_data(nlh); 3820 if (ifm->ifa_index) 3821 dev = __dev_get_by_index(net, ifm->ifa_index); 3822 3823 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3824 if (!ifa) { 3825 err = -EADDRNOTAVAIL; 3826 goto errout; 3827 } 3828 3829 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3830 if (!skb) { 3831 err = -ENOBUFS; 3832 goto errout_ifa; 3833 } 3834 3835 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3836 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3837 if (err < 0) { 3838 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3839 WARN_ON(err == -EMSGSIZE); 3840 kfree_skb(skb); 3841 goto errout_ifa; 3842 } 3843 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3844 errout_ifa: 3845 in6_ifa_put(ifa); 3846 errout: 3847 return err; 3848 } 3849 3850 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3851 { 3852 struct sk_buff *skb; 3853 struct net *net = dev_net(ifa->idev->dev); 3854 int err = -ENOBUFS; 3855 3856 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3857 if (skb == NULL) 3858 goto errout; 3859 3860 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3861 if (err < 0) { 3862 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3863 WARN_ON(err == -EMSGSIZE); 3864 kfree_skb(skb); 3865 goto errout; 3866 } 3867 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3868 return; 3869 errout: 3870 if (err < 0) 3871 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3872 } 3873 3874 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3875 __s32 *array, int bytes) 3876 { 3877 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3878 3879 memset(array, 0, bytes); 3880 array[DEVCONF_FORWARDING] = cnf->forwarding; 3881 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3882 array[DEVCONF_MTU6] = cnf->mtu6; 3883 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3884 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3885 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3886 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3887 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3888 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3889 jiffies_to_msecs(cnf->rtr_solicit_interval); 3890 array[DEVCONF_RTR_SOLICIT_DELAY] = 3891 jiffies_to_msecs(cnf->rtr_solicit_delay); 3892 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3893 #ifdef CONFIG_IPV6_PRIVACY 3894 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3895 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3896 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3897 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3898 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3899 #endif 3900 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3901 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3902 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3903 #ifdef CONFIG_IPV6_ROUTER_PREF 3904 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3905 array[DEVCONF_RTR_PROBE_INTERVAL] = 3906 jiffies_to_msecs(cnf->rtr_probe_interval); 3907 #ifdef CONFIG_IPV6_ROUTE_INFO 3908 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3909 #endif 3910 #endif 3911 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3912 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3913 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3914 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3915 #endif 3916 #ifdef CONFIG_IPV6_MROUTE 3917 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3918 #endif 3919 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3920 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3921 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3922 } 3923 3924 static inline size_t inet6_ifla6_size(void) 3925 { 3926 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3927 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3928 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3929 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3930 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3931 } 3932 3933 static inline size_t inet6_if_nlmsg_size(void) 3934 { 3935 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3936 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3937 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3938 + nla_total_size(4) /* IFLA_MTU */ 3939 + nla_total_size(4) /* IFLA_LINK */ 3940 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3941 } 3942 3943 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3944 int items, int bytes) 3945 { 3946 int i; 3947 int pad = bytes - sizeof(u64) * items; 3948 BUG_ON(pad < 0); 3949 3950 /* Use put_unaligned() because stats may not be aligned for u64. */ 3951 put_unaligned(items, &stats[0]); 3952 for (i = 1; i < items; i++) 3953 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3954 3955 memset(&stats[items], 0, pad); 3956 } 3957 3958 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3959 int items, int bytes, size_t syncpoff) 3960 { 3961 int i; 3962 int pad = bytes - sizeof(u64) * items; 3963 BUG_ON(pad < 0); 3964 3965 /* Use put_unaligned() because stats may not be aligned for u64. */ 3966 put_unaligned(items, &stats[0]); 3967 for (i = 1; i < items; i++) 3968 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3969 3970 memset(&stats[items], 0, pad); 3971 } 3972 3973 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3974 int bytes) 3975 { 3976 switch (attrtype) { 3977 case IFLA_INET6_STATS: 3978 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3979 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3980 break; 3981 case IFLA_INET6_ICMP6STATS: 3982 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3983 break; 3984 } 3985 } 3986 3987 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3988 { 3989 struct nlattr *nla; 3990 struct ifla_cacheinfo ci; 3991 3992 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3993 3994 ci.max_reasm_len = IPV6_MAXPLEN; 3995 ci.tstamp = cstamp_delta(idev->tstamp); 3996 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3997 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3998 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3999 4000 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4001 if (nla == NULL) 4002 goto nla_put_failure; 4003 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4004 4005 /* XXX - MC not implemented */ 4006 4007 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4008 if (nla == NULL) 4009 goto nla_put_failure; 4010 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4011 4012 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4013 if (nla == NULL) 4014 goto nla_put_failure; 4015 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4016 4017 return 0; 4018 4019 nla_put_failure: 4020 return -EMSGSIZE; 4021 } 4022 4023 static size_t inet6_get_link_af_size(const struct net_device *dev) 4024 { 4025 if (!__in6_dev_get(dev)) 4026 return 0; 4027 4028 return inet6_ifla6_size(); 4029 } 4030 4031 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4032 { 4033 struct inet6_dev *idev = __in6_dev_get(dev); 4034 4035 if (!idev) 4036 return -ENODATA; 4037 4038 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4039 return -EMSGSIZE; 4040 4041 return 0; 4042 } 4043 4044 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4045 u32 pid, u32 seq, int event, unsigned int flags) 4046 { 4047 struct net_device *dev = idev->dev; 4048 struct ifinfomsg *hdr; 4049 struct nlmsghdr *nlh; 4050 void *protoinfo; 4051 4052 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 4053 if (nlh == NULL) 4054 return -EMSGSIZE; 4055 4056 hdr = nlmsg_data(nlh); 4057 hdr->ifi_family = AF_INET6; 4058 hdr->__ifi_pad = 0; 4059 hdr->ifi_type = dev->type; 4060 hdr->ifi_index = dev->ifindex; 4061 hdr->ifi_flags = dev_get_flags(dev); 4062 hdr->ifi_change = 0; 4063 4064 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 4065 4066 if (dev->addr_len) 4067 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 4068 4069 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 4070 if (dev->ifindex != dev->iflink) 4071 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 4072 4073 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4074 if (protoinfo == NULL) 4075 goto nla_put_failure; 4076 4077 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4078 goto nla_put_failure; 4079 4080 nla_nest_end(skb, protoinfo); 4081 return nlmsg_end(skb, nlh); 4082 4083 nla_put_failure: 4084 nlmsg_cancel(skb, nlh); 4085 return -EMSGSIZE; 4086 } 4087 4088 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4089 { 4090 struct net *net = sock_net(skb->sk); 4091 int h, s_h; 4092 int idx = 0, s_idx; 4093 struct net_device *dev; 4094 struct inet6_dev *idev; 4095 struct hlist_head *head; 4096 struct hlist_node *node; 4097 4098 s_h = cb->args[0]; 4099 s_idx = cb->args[1]; 4100 4101 rcu_read_lock(); 4102 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4103 idx = 0; 4104 head = &net->dev_index_head[h]; 4105 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4106 if (idx < s_idx) 4107 goto cont; 4108 idev = __in6_dev_get(dev); 4109 if (!idev) 4110 goto cont; 4111 if (inet6_fill_ifinfo(skb, idev, 4112 NETLINK_CB(cb->skb).pid, 4113 cb->nlh->nlmsg_seq, 4114 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4115 goto out; 4116 cont: 4117 idx++; 4118 } 4119 } 4120 out: 4121 rcu_read_unlock(); 4122 cb->args[1] = idx; 4123 cb->args[0] = h; 4124 4125 return skb->len; 4126 } 4127 4128 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4129 { 4130 struct sk_buff *skb; 4131 struct net *net = dev_net(idev->dev); 4132 int err = -ENOBUFS; 4133 4134 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4135 if (skb == NULL) 4136 goto errout; 4137 4138 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4139 if (err < 0) { 4140 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4141 WARN_ON(err == -EMSGSIZE); 4142 kfree_skb(skb); 4143 goto errout; 4144 } 4145 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4146 return; 4147 errout: 4148 if (err < 0) 4149 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4150 } 4151 4152 static inline size_t inet6_prefix_nlmsg_size(void) 4153 { 4154 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4155 + nla_total_size(sizeof(struct in6_addr)) 4156 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4157 } 4158 4159 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4160 struct prefix_info *pinfo, u32 pid, u32 seq, 4161 int event, unsigned int flags) 4162 { 4163 struct prefixmsg *pmsg; 4164 struct nlmsghdr *nlh; 4165 struct prefix_cacheinfo ci; 4166 4167 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4168 if (nlh == NULL) 4169 return -EMSGSIZE; 4170 4171 pmsg = nlmsg_data(nlh); 4172 pmsg->prefix_family = AF_INET6; 4173 pmsg->prefix_pad1 = 0; 4174 pmsg->prefix_pad2 = 0; 4175 pmsg->prefix_ifindex = idev->dev->ifindex; 4176 pmsg->prefix_len = pinfo->prefix_len; 4177 pmsg->prefix_type = pinfo->type; 4178 pmsg->prefix_pad3 = 0; 4179 pmsg->prefix_flags = 0; 4180 if (pinfo->onlink) 4181 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4182 if (pinfo->autoconf) 4183 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4184 4185 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4186 4187 ci.preferred_time = ntohl(pinfo->prefered); 4188 ci.valid_time = ntohl(pinfo->valid); 4189 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4190 4191 return nlmsg_end(skb, nlh); 4192 4193 nla_put_failure: 4194 nlmsg_cancel(skb, nlh); 4195 return -EMSGSIZE; 4196 } 4197 4198 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4199 struct prefix_info *pinfo) 4200 { 4201 struct sk_buff *skb; 4202 struct net *net = dev_net(idev->dev); 4203 int err = -ENOBUFS; 4204 4205 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4206 if (skb == NULL) 4207 goto errout; 4208 4209 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4210 if (err < 0) { 4211 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4212 WARN_ON(err == -EMSGSIZE); 4213 kfree_skb(skb); 4214 goto errout; 4215 } 4216 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4217 return; 4218 errout: 4219 if (err < 0) 4220 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4221 } 4222 4223 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4224 { 4225 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4226 4227 switch (event) { 4228 case RTM_NEWADDR: 4229 /* 4230 * If the address was optimistic 4231 * we inserted the route at the start of 4232 * our DAD process, so we don't need 4233 * to do it again 4234 */ 4235 if (!(ifp->rt->rt6i_node)) 4236 ip6_ins_rt(ifp->rt); 4237 if (ifp->idev->cnf.forwarding) 4238 addrconf_join_anycast(ifp); 4239 break; 4240 case RTM_DELADDR: 4241 if (ifp->idev->cnf.forwarding) 4242 addrconf_leave_anycast(ifp); 4243 addrconf_leave_solict(ifp->idev, &ifp->addr); 4244 dst_hold(&ifp->rt->dst); 4245 4246 if (ip6_del_rt(ifp->rt)) 4247 dst_free(&ifp->rt->dst); 4248 break; 4249 } 4250 } 4251 4252 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4253 { 4254 rcu_read_lock_bh(); 4255 if (likely(ifp->idev->dead == 0)) 4256 __ipv6_ifa_notify(event, ifp); 4257 rcu_read_unlock_bh(); 4258 } 4259 4260 #ifdef CONFIG_SYSCTL 4261 4262 static 4263 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4264 void __user *buffer, size_t *lenp, loff_t *ppos) 4265 { 4266 int *valp = ctl->data; 4267 int val = *valp; 4268 loff_t pos = *ppos; 4269 ctl_table lctl; 4270 int ret; 4271 4272 /* 4273 * ctl->data points to idev->cnf.forwarding, we should 4274 * not modify it until we get the rtnl lock. 4275 */ 4276 lctl = *ctl; 4277 lctl.data = &val; 4278 4279 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4280 4281 if (write) 4282 ret = addrconf_fixup_forwarding(ctl, valp, val); 4283 if (ret) 4284 *ppos = pos; 4285 return ret; 4286 } 4287 4288 static void dev_disable_change(struct inet6_dev *idev) 4289 { 4290 if (!idev || !idev->dev) 4291 return; 4292 4293 if (idev->cnf.disable_ipv6) 4294 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4295 else 4296 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4297 } 4298 4299 static void addrconf_disable_change(struct net *net, __s32 newf) 4300 { 4301 struct net_device *dev; 4302 struct inet6_dev *idev; 4303 4304 rcu_read_lock(); 4305 for_each_netdev_rcu(net, dev) { 4306 idev = __in6_dev_get(dev); 4307 if (idev) { 4308 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4309 idev->cnf.disable_ipv6 = newf; 4310 if (changed) 4311 dev_disable_change(idev); 4312 } 4313 } 4314 rcu_read_unlock(); 4315 } 4316 4317 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4318 { 4319 struct net *net; 4320 int old; 4321 4322 if (!rtnl_trylock()) 4323 return restart_syscall(); 4324 4325 net = (struct net *)table->extra2; 4326 old = *p; 4327 *p = newf; 4328 4329 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4330 rtnl_unlock(); 4331 return 0; 4332 } 4333 4334 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4335 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4336 addrconf_disable_change(net, newf); 4337 } else if ((!newf) ^ (!old)) 4338 dev_disable_change((struct inet6_dev *)table->extra1); 4339 4340 rtnl_unlock(); 4341 return 0; 4342 } 4343 4344 static 4345 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4346 void __user *buffer, size_t *lenp, loff_t *ppos) 4347 { 4348 int *valp = ctl->data; 4349 int val = *valp; 4350 loff_t pos = *ppos; 4351 ctl_table lctl; 4352 int ret; 4353 4354 /* 4355 * ctl->data points to idev->cnf.disable_ipv6, we should 4356 * not modify it until we get the rtnl lock. 4357 */ 4358 lctl = *ctl; 4359 lctl.data = &val; 4360 4361 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4362 4363 if (write) 4364 ret = addrconf_disable_ipv6(ctl, valp, val); 4365 if (ret) 4366 *ppos = pos; 4367 return ret; 4368 } 4369 4370 static struct addrconf_sysctl_table 4371 { 4372 struct ctl_table_header *sysctl_header; 4373 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4374 char *dev_name; 4375 } addrconf_sysctl __read_mostly = { 4376 .sysctl_header = NULL, 4377 .addrconf_vars = { 4378 { 4379 .procname = "forwarding", 4380 .data = &ipv6_devconf.forwarding, 4381 .maxlen = sizeof(int), 4382 .mode = 0644, 4383 .proc_handler = addrconf_sysctl_forward, 4384 }, 4385 { 4386 .procname = "hop_limit", 4387 .data = &ipv6_devconf.hop_limit, 4388 .maxlen = sizeof(int), 4389 .mode = 0644, 4390 .proc_handler = proc_dointvec, 4391 }, 4392 { 4393 .procname = "mtu", 4394 .data = &ipv6_devconf.mtu6, 4395 .maxlen = sizeof(int), 4396 .mode = 0644, 4397 .proc_handler = proc_dointvec, 4398 }, 4399 { 4400 .procname = "accept_ra", 4401 .data = &ipv6_devconf.accept_ra, 4402 .maxlen = sizeof(int), 4403 .mode = 0644, 4404 .proc_handler = proc_dointvec, 4405 }, 4406 { 4407 .procname = "accept_redirects", 4408 .data = &ipv6_devconf.accept_redirects, 4409 .maxlen = sizeof(int), 4410 .mode = 0644, 4411 .proc_handler = proc_dointvec, 4412 }, 4413 { 4414 .procname = "autoconf", 4415 .data = &ipv6_devconf.autoconf, 4416 .maxlen = sizeof(int), 4417 .mode = 0644, 4418 .proc_handler = proc_dointvec, 4419 }, 4420 { 4421 .procname = "dad_transmits", 4422 .data = &ipv6_devconf.dad_transmits, 4423 .maxlen = sizeof(int), 4424 .mode = 0644, 4425 .proc_handler = proc_dointvec, 4426 }, 4427 { 4428 .procname = "router_solicitations", 4429 .data = &ipv6_devconf.rtr_solicits, 4430 .maxlen = sizeof(int), 4431 .mode = 0644, 4432 .proc_handler = proc_dointvec, 4433 }, 4434 { 4435 .procname = "router_solicitation_interval", 4436 .data = &ipv6_devconf.rtr_solicit_interval, 4437 .maxlen = sizeof(int), 4438 .mode = 0644, 4439 .proc_handler = proc_dointvec_jiffies, 4440 }, 4441 { 4442 .procname = "router_solicitation_delay", 4443 .data = &ipv6_devconf.rtr_solicit_delay, 4444 .maxlen = sizeof(int), 4445 .mode = 0644, 4446 .proc_handler = proc_dointvec_jiffies, 4447 }, 4448 { 4449 .procname = "force_mld_version", 4450 .data = &ipv6_devconf.force_mld_version, 4451 .maxlen = sizeof(int), 4452 .mode = 0644, 4453 .proc_handler = proc_dointvec, 4454 }, 4455 #ifdef CONFIG_IPV6_PRIVACY 4456 { 4457 .procname = "use_tempaddr", 4458 .data = &ipv6_devconf.use_tempaddr, 4459 .maxlen = sizeof(int), 4460 .mode = 0644, 4461 .proc_handler = proc_dointvec, 4462 }, 4463 { 4464 .procname = "temp_valid_lft", 4465 .data = &ipv6_devconf.temp_valid_lft, 4466 .maxlen = sizeof(int), 4467 .mode = 0644, 4468 .proc_handler = proc_dointvec, 4469 }, 4470 { 4471 .procname = "temp_prefered_lft", 4472 .data = &ipv6_devconf.temp_prefered_lft, 4473 .maxlen = sizeof(int), 4474 .mode = 0644, 4475 .proc_handler = proc_dointvec, 4476 }, 4477 { 4478 .procname = "regen_max_retry", 4479 .data = &ipv6_devconf.regen_max_retry, 4480 .maxlen = sizeof(int), 4481 .mode = 0644, 4482 .proc_handler = proc_dointvec, 4483 }, 4484 { 4485 .procname = "max_desync_factor", 4486 .data = &ipv6_devconf.max_desync_factor, 4487 .maxlen = sizeof(int), 4488 .mode = 0644, 4489 .proc_handler = proc_dointvec, 4490 }, 4491 #endif 4492 { 4493 .procname = "max_addresses", 4494 .data = &ipv6_devconf.max_addresses, 4495 .maxlen = sizeof(int), 4496 .mode = 0644, 4497 .proc_handler = proc_dointvec, 4498 }, 4499 { 4500 .procname = "accept_ra_defrtr", 4501 .data = &ipv6_devconf.accept_ra_defrtr, 4502 .maxlen = sizeof(int), 4503 .mode = 0644, 4504 .proc_handler = proc_dointvec, 4505 }, 4506 { 4507 .procname = "accept_ra_pinfo", 4508 .data = &ipv6_devconf.accept_ra_pinfo, 4509 .maxlen = sizeof(int), 4510 .mode = 0644, 4511 .proc_handler = proc_dointvec, 4512 }, 4513 #ifdef CONFIG_IPV6_ROUTER_PREF 4514 { 4515 .procname = "accept_ra_rtr_pref", 4516 .data = &ipv6_devconf.accept_ra_rtr_pref, 4517 .maxlen = sizeof(int), 4518 .mode = 0644, 4519 .proc_handler = proc_dointvec, 4520 }, 4521 { 4522 .procname = "router_probe_interval", 4523 .data = &ipv6_devconf.rtr_probe_interval, 4524 .maxlen = sizeof(int), 4525 .mode = 0644, 4526 .proc_handler = proc_dointvec_jiffies, 4527 }, 4528 #ifdef CONFIG_IPV6_ROUTE_INFO 4529 { 4530 .procname = "accept_ra_rt_info_max_plen", 4531 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4532 .maxlen = sizeof(int), 4533 .mode = 0644, 4534 .proc_handler = proc_dointvec, 4535 }, 4536 #endif 4537 #endif 4538 { 4539 .procname = "proxy_ndp", 4540 .data = &ipv6_devconf.proxy_ndp, 4541 .maxlen = sizeof(int), 4542 .mode = 0644, 4543 .proc_handler = proc_dointvec, 4544 }, 4545 { 4546 .procname = "accept_source_route", 4547 .data = &ipv6_devconf.accept_source_route, 4548 .maxlen = sizeof(int), 4549 .mode = 0644, 4550 .proc_handler = proc_dointvec, 4551 }, 4552 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4553 { 4554 .procname = "optimistic_dad", 4555 .data = &ipv6_devconf.optimistic_dad, 4556 .maxlen = sizeof(int), 4557 .mode = 0644, 4558 .proc_handler = proc_dointvec, 4559 4560 }, 4561 #endif 4562 #ifdef CONFIG_IPV6_MROUTE 4563 { 4564 .procname = "mc_forwarding", 4565 .data = &ipv6_devconf.mc_forwarding, 4566 .maxlen = sizeof(int), 4567 .mode = 0444, 4568 .proc_handler = proc_dointvec, 4569 }, 4570 #endif 4571 { 4572 .procname = "disable_ipv6", 4573 .data = &ipv6_devconf.disable_ipv6, 4574 .maxlen = sizeof(int), 4575 .mode = 0644, 4576 .proc_handler = addrconf_sysctl_disable, 4577 }, 4578 { 4579 .procname = "accept_dad", 4580 .data = &ipv6_devconf.accept_dad, 4581 .maxlen = sizeof(int), 4582 .mode = 0644, 4583 .proc_handler = proc_dointvec, 4584 }, 4585 { 4586 .procname = "force_tllao", 4587 .data = &ipv6_devconf.force_tllao, 4588 .maxlen = sizeof(int), 4589 .mode = 0644, 4590 .proc_handler = proc_dointvec 4591 }, 4592 { 4593 /* sentinel */ 4594 } 4595 }, 4596 }; 4597 4598 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4599 struct inet6_dev *idev, struct ipv6_devconf *p) 4600 { 4601 int i; 4602 struct addrconf_sysctl_table *t; 4603 4604 #define ADDRCONF_CTL_PATH_DEV 3 4605 4606 struct ctl_path addrconf_ctl_path[] = { 4607 { .procname = "net", }, 4608 { .procname = "ipv6", }, 4609 { .procname = "conf", }, 4610 { /* to be set */ }, 4611 { }, 4612 }; 4613 4614 4615 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4616 if (t == NULL) 4617 goto out; 4618 4619 for (i = 0; t->addrconf_vars[i].data; i++) { 4620 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4621 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4622 t->addrconf_vars[i].extra2 = net; 4623 } 4624 4625 /* 4626 * Make a copy of dev_name, because '.procname' is regarded as const 4627 * by sysctl and we wouldn't want anyone to change it under our feet 4628 * (see SIOCSIFNAME). 4629 */ 4630 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4631 if (!t->dev_name) 4632 goto free; 4633 4634 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4635 4636 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4637 t->addrconf_vars); 4638 if (t->sysctl_header == NULL) 4639 goto free_procname; 4640 4641 p->sysctl = t; 4642 return 0; 4643 4644 free_procname: 4645 kfree(t->dev_name); 4646 free: 4647 kfree(t); 4648 out: 4649 return -ENOBUFS; 4650 } 4651 4652 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4653 { 4654 struct addrconf_sysctl_table *t; 4655 4656 if (p->sysctl == NULL) 4657 return; 4658 4659 t = p->sysctl; 4660 p->sysctl = NULL; 4661 unregister_net_sysctl_table(t->sysctl_header); 4662 kfree(t->dev_name); 4663 kfree(t); 4664 } 4665 4666 static void addrconf_sysctl_register(struct inet6_dev *idev) 4667 { 4668 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4669 &ndisc_ifinfo_sysctl_change); 4670 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4671 idev, &idev->cnf); 4672 } 4673 4674 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4675 { 4676 __addrconf_sysctl_unregister(&idev->cnf); 4677 neigh_sysctl_unregister(idev->nd_parms); 4678 } 4679 4680 4681 #endif 4682 4683 static int __net_init addrconf_init_net(struct net *net) 4684 { 4685 int err; 4686 struct ipv6_devconf *all, *dflt; 4687 4688 err = -ENOMEM; 4689 all = &ipv6_devconf; 4690 dflt = &ipv6_devconf_dflt; 4691 4692 if (!net_eq(net, &init_net)) { 4693 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4694 if (all == NULL) 4695 goto err_alloc_all; 4696 4697 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4698 if (dflt == NULL) 4699 goto err_alloc_dflt; 4700 } else { 4701 /* these will be inherited by all namespaces */ 4702 dflt->autoconf = ipv6_defaults.autoconf; 4703 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4704 } 4705 4706 net->ipv6.devconf_all = all; 4707 net->ipv6.devconf_dflt = dflt; 4708 4709 #ifdef CONFIG_SYSCTL 4710 err = __addrconf_sysctl_register(net, "all", NULL, all); 4711 if (err < 0) 4712 goto err_reg_all; 4713 4714 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4715 if (err < 0) 4716 goto err_reg_dflt; 4717 #endif 4718 return 0; 4719 4720 #ifdef CONFIG_SYSCTL 4721 err_reg_dflt: 4722 __addrconf_sysctl_unregister(all); 4723 err_reg_all: 4724 kfree(dflt); 4725 #endif 4726 err_alloc_dflt: 4727 kfree(all); 4728 err_alloc_all: 4729 return err; 4730 } 4731 4732 static void __net_exit addrconf_exit_net(struct net *net) 4733 { 4734 #ifdef CONFIG_SYSCTL 4735 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4736 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4737 #endif 4738 if (!net_eq(net, &init_net)) { 4739 kfree(net->ipv6.devconf_dflt); 4740 kfree(net->ipv6.devconf_all); 4741 } 4742 } 4743 4744 static struct pernet_operations addrconf_ops = { 4745 .init = addrconf_init_net, 4746 .exit = addrconf_exit_net, 4747 }; 4748 4749 /* 4750 * Device notifier 4751 */ 4752 4753 int register_inet6addr_notifier(struct notifier_block *nb) 4754 { 4755 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4756 } 4757 EXPORT_SYMBOL(register_inet6addr_notifier); 4758 4759 int unregister_inet6addr_notifier(struct notifier_block *nb) 4760 { 4761 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4762 } 4763 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4764 4765 static struct rtnl_af_ops inet6_ops = { 4766 .family = AF_INET6, 4767 .fill_link_af = inet6_fill_link_af, 4768 .get_link_af_size = inet6_get_link_af_size, 4769 }; 4770 4771 /* 4772 * Init / cleanup code 4773 */ 4774 4775 int __init addrconf_init(void) 4776 { 4777 int i, err; 4778 4779 err = ipv6_addr_label_init(); 4780 if (err < 0) { 4781 printk(KERN_CRIT "IPv6 Addrconf:" 4782 " cannot initialize default policy table: %d.\n", err); 4783 goto out; 4784 } 4785 4786 err = register_pernet_subsys(&addrconf_ops); 4787 if (err < 0) 4788 goto out_addrlabel; 4789 4790 /* The addrconf netdev notifier requires that loopback_dev 4791 * has it's ipv6 private information allocated and setup 4792 * before it can bring up and give link-local addresses 4793 * to other devices which are up. 4794 * 4795 * Unfortunately, loopback_dev is not necessarily the first 4796 * entry in the global dev_base list of net devices. In fact, 4797 * it is likely to be the very last entry on that list. 4798 * So this causes the notifier registry below to try and 4799 * give link-local addresses to all devices besides loopback_dev 4800 * first, then loopback_dev, which cases all the non-loopback_dev 4801 * devices to fail to get a link-local address. 4802 * 4803 * So, as a temporary fix, allocate the ipv6 structure for 4804 * loopback_dev first by hand. 4805 * Longer term, all of the dependencies ipv6 has upon the loopback 4806 * device and it being up should be removed. 4807 */ 4808 rtnl_lock(); 4809 if (!ipv6_add_dev(init_net.loopback_dev)) 4810 err = -ENOMEM; 4811 rtnl_unlock(); 4812 if (err) 4813 goto errlo; 4814 4815 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4816 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4817 4818 register_netdevice_notifier(&ipv6_dev_notf); 4819 4820 addrconf_verify(0); 4821 4822 err = rtnl_af_register(&inet6_ops); 4823 if (err < 0) 4824 goto errout_af; 4825 4826 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4827 NULL); 4828 if (err < 0) 4829 goto errout; 4830 4831 /* Only the first call to __rtnl_register can fail */ 4832 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4833 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4834 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4835 inet6_dump_ifaddr, NULL); 4836 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4837 inet6_dump_ifmcaddr, NULL); 4838 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4839 inet6_dump_ifacaddr, NULL); 4840 4841 ipv6_addr_label_rtnl_register(); 4842 4843 return 0; 4844 errout: 4845 rtnl_af_unregister(&inet6_ops); 4846 errout_af: 4847 unregister_netdevice_notifier(&ipv6_dev_notf); 4848 errlo: 4849 unregister_pernet_subsys(&addrconf_ops); 4850 out_addrlabel: 4851 ipv6_addr_label_cleanup(); 4852 out: 4853 return err; 4854 } 4855 4856 void addrconf_cleanup(void) 4857 { 4858 struct net_device *dev; 4859 int i; 4860 4861 unregister_netdevice_notifier(&ipv6_dev_notf); 4862 unregister_pernet_subsys(&addrconf_ops); 4863 ipv6_addr_label_cleanup(); 4864 4865 rtnl_lock(); 4866 4867 __rtnl_af_unregister(&inet6_ops); 4868 4869 /* clean dev list */ 4870 for_each_netdev(&init_net, dev) { 4871 if (__in6_dev_get(dev) == NULL) 4872 continue; 4873 addrconf_ifdown(dev, 1); 4874 } 4875 addrconf_ifdown(init_net.loopback_dev, 2); 4876 4877 /* 4878 * Check hash table. 4879 */ 4880 spin_lock_bh(&addrconf_hash_lock); 4881 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4882 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4883 spin_unlock_bh(&addrconf_hash_lock); 4884 4885 del_timer(&addr_chk_timer); 4886 rtnl_unlock(); 4887 } 4888