1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #include <linux/errno.h> 42 #include <linux/types.h> 43 #include <linux/kernel.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <linux/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 91 /* Set to 3 to get tracing... */ 92 #define ACONF_DEBUG 2 93 94 #if ACONF_DEBUG >= 3 95 #define ADBG(x) printk x 96 #else 97 #define ADBG(x) 98 #endif 99 100 #define INFINITY_LIFE_TIME 0xFFFFFFFF 101 102 static inline u32 cstamp_delta(unsigned long cstamp) 103 { 104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 105 } 106 107 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 108 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 109 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 110 111 #ifdef CONFIG_SYSCTL 112 static void addrconf_sysctl_register(struct inet6_dev *idev); 113 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 114 #else 115 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 116 { 117 } 118 119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 120 { 121 } 122 #endif 123 124 #ifdef CONFIG_IPV6_PRIVACY 125 static int __ipv6_regen_rndid(struct inet6_dev *idev); 126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 127 static void ipv6_regen_rndid(unsigned long data); 128 #endif 129 130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 131 static int ipv6_count_addresses(struct inet6_dev *idev); 132 133 /* 134 * Configured unicast address hash table 135 */ 136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 137 static DEFINE_SPINLOCK(addrconf_hash_lock); 138 139 static void addrconf_verify(unsigned long); 140 141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 142 static DEFINE_SPINLOCK(addrconf_verify_lock); 143 144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 146 147 static void addrconf_type_change(struct net_device *dev, 148 unsigned long event); 149 static int addrconf_ifdown(struct net_device *dev, int how); 150 151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 152 static void addrconf_dad_timer(unsigned long data); 153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 154 static void addrconf_dad_run(struct inet6_dev *idev); 155 static void addrconf_rs_timer(unsigned long data); 156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 158 159 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 160 struct prefix_info *pinfo); 161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 162 struct net_device *dev); 163 164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 165 166 static struct ipv6_devconf ipv6_devconf __read_mostly = { 167 .forwarding = 0, 168 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 169 .mtu6 = IPV6_MIN_MTU, 170 .accept_ra = 1, 171 .accept_redirects = 1, 172 .autoconf = 1, 173 .force_mld_version = 0, 174 .dad_transmits = 1, 175 .rtr_solicits = MAX_RTR_SOLICITATIONS, 176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 178 #ifdef CONFIG_IPV6_PRIVACY 179 .use_tempaddr = 0, 180 .temp_valid_lft = TEMP_VALID_LIFETIME, 181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 182 .regen_max_retry = REGEN_MAX_RETRY, 183 .max_desync_factor = MAX_DESYNC_FACTOR, 184 #endif 185 .max_addresses = IPV6_MAX_ADDRESSES, 186 .accept_ra_defrtr = 1, 187 .accept_ra_pinfo = 1, 188 #ifdef CONFIG_IPV6_ROUTER_PREF 189 .accept_ra_rtr_pref = 1, 190 .rtr_probe_interval = 60 * HZ, 191 #ifdef CONFIG_IPV6_ROUTE_INFO 192 .accept_ra_rt_info_max_plen = 0, 193 #endif 194 #endif 195 .proxy_ndp = 0, 196 .accept_source_route = 0, /* we do not accept RH0 by default. */ 197 .disable_ipv6 = 0, 198 .accept_dad = 1, 199 }; 200 201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 202 .forwarding = 0, 203 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 204 .mtu6 = IPV6_MIN_MTU, 205 .accept_ra = 1, 206 .accept_redirects = 1, 207 .autoconf = 1, 208 .dad_transmits = 1, 209 .rtr_solicits = MAX_RTR_SOLICITATIONS, 210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 212 #ifdef CONFIG_IPV6_PRIVACY 213 .use_tempaddr = 0, 214 .temp_valid_lft = TEMP_VALID_LIFETIME, 215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 216 .regen_max_retry = REGEN_MAX_RETRY, 217 .max_desync_factor = MAX_DESYNC_FACTOR, 218 #endif 219 .max_addresses = IPV6_MAX_ADDRESSES, 220 .accept_ra_defrtr = 1, 221 .accept_ra_pinfo = 1, 222 #ifdef CONFIG_IPV6_ROUTER_PREF 223 .accept_ra_rtr_pref = 1, 224 .rtr_probe_interval = 60 * HZ, 225 #ifdef CONFIG_IPV6_ROUTE_INFO 226 .accept_ra_rt_info_max_plen = 0, 227 #endif 228 #endif 229 .proxy_ndp = 0, 230 .accept_source_route = 0, /* we do not accept RH0 by default. */ 231 .disable_ipv6 = 0, 232 .accept_dad = 1, 233 }; 234 235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 240 241 /* Check if a valid qdisc is available */ 242 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 243 { 244 return !qdisc_tx_is_noop(dev); 245 } 246 247 /* Check if a route is valid prefix route */ 248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 249 { 250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 251 } 252 253 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 254 { 255 if (del_timer(&ifp->timer)) 256 __in6_ifa_put(ifp); 257 } 258 259 enum addrconf_timer_t { 260 AC_NONE, 261 AC_DAD, 262 AC_RS, 263 }; 264 265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 266 enum addrconf_timer_t what, 267 unsigned long when) 268 { 269 if (!del_timer(&ifp->timer)) 270 in6_ifa_hold(ifp); 271 272 switch (what) { 273 case AC_DAD: 274 ifp->timer.function = addrconf_dad_timer; 275 break; 276 case AC_RS: 277 ifp->timer.function = addrconf_rs_timer; 278 break; 279 default: 280 break; 281 } 282 ifp->timer.expires = jiffies + when; 283 add_timer(&ifp->timer); 284 } 285 286 static int snmp6_alloc_dev(struct inet6_dev *idev) 287 { 288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 289 sizeof(struct ipstats_mib), 290 __alignof__(struct ipstats_mib)) < 0) 291 goto err_ip; 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6, 293 sizeof(struct icmpv6_mib), 294 __alignof__(struct icmpv6_mib)) < 0) 295 goto err_icmp; 296 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg, 297 sizeof(struct icmpv6msg_mib), 298 __alignof__(struct icmpv6msg_mib)) < 0) 299 goto err_icmpmsg; 300 301 return 0; 302 303 err_icmpmsg: 304 snmp_mib_free((void __percpu **)idev->stats.icmpv6); 305 err_icmp: 306 snmp_mib_free((void __percpu **)idev->stats.ipv6); 307 err_ip: 308 return -ENOMEM; 309 } 310 311 static void snmp6_free_dev(struct inet6_dev *idev) 312 { 313 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg); 314 snmp_mib_free((void __percpu **)idev->stats.icmpv6); 315 snmp_mib_free((void __percpu **)idev->stats.ipv6); 316 } 317 318 /* Nobody refers to this device, we may destroy it. */ 319 320 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 321 { 322 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 323 kfree(idev); 324 } 325 326 void in6_dev_finish_destroy(struct inet6_dev *idev) 327 { 328 struct net_device *dev = idev->dev; 329 330 WARN_ON(!list_empty(&idev->addr_list)); 331 WARN_ON(idev->mc_list != NULL); 332 333 #ifdef NET_REFCNT_DEBUG 334 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 335 #endif 336 dev_put(dev); 337 if (!idev->dead) { 338 pr_warning("Freeing alive inet6 device %p\n", idev); 339 return; 340 } 341 snmp6_free_dev(idev); 342 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 343 } 344 345 EXPORT_SYMBOL(in6_dev_finish_destroy); 346 347 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 348 { 349 struct inet6_dev *ndev; 350 351 ASSERT_RTNL(); 352 353 if (dev->mtu < IPV6_MIN_MTU) 354 return NULL; 355 356 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 357 358 if (ndev == NULL) 359 return NULL; 360 361 rwlock_init(&ndev->lock); 362 ndev->dev = dev; 363 INIT_LIST_HEAD(&ndev->addr_list); 364 365 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 366 ndev->cnf.mtu6 = dev->mtu; 367 ndev->cnf.sysctl = NULL; 368 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 369 if (ndev->nd_parms == NULL) { 370 kfree(ndev); 371 return NULL; 372 } 373 if (ndev->cnf.forwarding) 374 dev_disable_lro(dev); 375 /* We refer to the device */ 376 dev_hold(dev); 377 378 if (snmp6_alloc_dev(ndev) < 0) { 379 ADBG((KERN_WARNING 380 "%s(): cannot allocate memory for statistics; dev=%s.\n", 381 __func__, dev->name)); 382 neigh_parms_release(&nd_tbl, ndev->nd_parms); 383 ndev->dead = 1; 384 in6_dev_finish_destroy(ndev); 385 return NULL; 386 } 387 388 if (snmp6_register_dev(ndev) < 0) { 389 ADBG((KERN_WARNING 390 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 391 __func__, dev->name)); 392 neigh_parms_release(&nd_tbl, ndev->nd_parms); 393 ndev->dead = 1; 394 in6_dev_finish_destroy(ndev); 395 return NULL; 396 } 397 398 /* One reference from device. We must do this before 399 * we invoke __ipv6_regen_rndid(). 400 */ 401 in6_dev_hold(ndev); 402 403 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 404 ndev->cnf.accept_dad = -1; 405 406 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 407 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 408 printk(KERN_INFO 409 "%s: Disabled Multicast RS\n", 410 dev->name); 411 ndev->cnf.rtr_solicits = 0; 412 } 413 #endif 414 415 #ifdef CONFIG_IPV6_PRIVACY 416 INIT_LIST_HEAD(&ndev->tempaddr_list); 417 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 418 if ((dev->flags&IFF_LOOPBACK) || 419 dev->type == ARPHRD_TUNNEL || 420 dev->type == ARPHRD_TUNNEL6 || 421 dev->type == ARPHRD_SIT || 422 dev->type == ARPHRD_NONE) { 423 ndev->cnf.use_tempaddr = -1; 424 } else { 425 in6_dev_hold(ndev); 426 ipv6_regen_rndid((unsigned long) ndev); 427 } 428 #endif 429 430 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 431 ndev->if_flags |= IF_READY; 432 433 ipv6_mc_init_dev(ndev); 434 ndev->tstamp = jiffies; 435 addrconf_sysctl_register(ndev); 436 /* protected by rtnl_lock */ 437 rcu_assign_pointer(dev->ip6_ptr, ndev); 438 439 /* Join all-node multicast group */ 440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 441 442 return ndev; 443 } 444 445 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 446 { 447 struct inet6_dev *idev; 448 449 ASSERT_RTNL(); 450 451 idev = __in6_dev_get(dev); 452 if (!idev) { 453 idev = ipv6_add_dev(dev); 454 if (!idev) 455 return NULL; 456 } 457 458 if (dev->flags&IFF_UP) 459 ipv6_mc_up(idev); 460 return idev; 461 } 462 463 #ifdef CONFIG_SYSCTL 464 static void dev_forward_change(struct inet6_dev *idev) 465 { 466 struct net_device *dev; 467 struct inet6_ifaddr *ifa; 468 469 if (!idev) 470 return; 471 dev = idev->dev; 472 if (idev->cnf.forwarding) 473 dev_disable_lro(dev); 474 if (dev && (dev->flags & IFF_MULTICAST)) { 475 if (idev->cnf.forwarding) 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 477 else 478 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 479 } 480 481 list_for_each_entry(ifa, &idev->addr_list, if_list) { 482 if (ifa->flags&IFA_F_TENTATIVE) 483 continue; 484 if (idev->cnf.forwarding) 485 addrconf_join_anycast(ifa); 486 else 487 addrconf_leave_anycast(ifa); 488 } 489 } 490 491 492 static void addrconf_forward_change(struct net *net, __s32 newf) 493 { 494 struct net_device *dev; 495 struct inet6_dev *idev; 496 497 rcu_read_lock(); 498 for_each_netdev_rcu(net, dev) { 499 idev = __in6_dev_get(dev); 500 if (idev) { 501 int changed = (!idev->cnf.forwarding) ^ (!newf); 502 idev->cnf.forwarding = newf; 503 if (changed) 504 dev_forward_change(idev); 505 } 506 } 507 rcu_read_unlock(); 508 } 509 510 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 511 { 512 struct net *net; 513 514 net = (struct net *)table->extra2; 515 if (p == &net->ipv6.devconf_dflt->forwarding) 516 return 0; 517 518 if (!rtnl_trylock()) { 519 /* Restore the original values before restarting */ 520 *p = old; 521 return restart_syscall(); 522 } 523 524 if (p == &net->ipv6.devconf_all->forwarding) { 525 __s32 newf = net->ipv6.devconf_all->forwarding; 526 net->ipv6.devconf_dflt->forwarding = newf; 527 addrconf_forward_change(net, newf); 528 } else if ((!*p) ^ (!old)) 529 dev_forward_change((struct inet6_dev *)table->extra1); 530 rtnl_unlock(); 531 532 if (*p) 533 rt6_purge_dflt_routers(net); 534 return 1; 535 } 536 #endif 537 538 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head) 539 { 540 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu); 541 kfree(ifp); 542 } 543 544 /* Nobody refers to this ifaddr, destroy it */ 545 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 546 { 547 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 548 549 #ifdef NET_REFCNT_DEBUG 550 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 551 #endif 552 553 in6_dev_put(ifp->idev); 554 555 if (del_timer(&ifp->timer)) 556 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 557 558 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 559 pr_warning("Freeing alive inet6 address %p\n", ifp); 560 return; 561 } 562 dst_release(&ifp->rt->dst); 563 564 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu); 565 } 566 567 static void 568 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 569 { 570 struct list_head *p; 571 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 572 573 /* 574 * Each device address list is sorted in order of scope - 575 * global before linklocal. 576 */ 577 list_for_each(p, &idev->addr_list) { 578 struct inet6_ifaddr *ifa 579 = list_entry(p, struct inet6_ifaddr, if_list); 580 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 581 break; 582 } 583 584 list_add_tail(&ifp->if_list, p); 585 } 586 587 static u32 ipv6_addr_hash(const struct in6_addr *addr) 588 { 589 /* 590 * We perform the hash function over the last 64 bits of the address 591 * This will include the IEEE address token on links that support it. 592 */ 593 return jhash_2words((__force u32)addr->s6_addr32[2], 594 (__force u32)addr->s6_addr32[3], 0) 595 & (IN6_ADDR_HSIZE - 1); 596 } 597 598 /* On success it returns ifp with increased reference count */ 599 600 static struct inet6_ifaddr * 601 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 602 int scope, u32 flags) 603 { 604 struct inet6_ifaddr *ifa = NULL; 605 struct rt6_info *rt; 606 unsigned int hash; 607 int err = 0; 608 int addr_type = ipv6_addr_type(addr); 609 610 if (addr_type == IPV6_ADDR_ANY || 611 addr_type & IPV6_ADDR_MULTICAST || 612 (!(idev->dev->flags & IFF_LOOPBACK) && 613 addr_type & IPV6_ADDR_LOOPBACK)) 614 return ERR_PTR(-EADDRNOTAVAIL); 615 616 rcu_read_lock_bh(); 617 if (idev->dead) { 618 err = -ENODEV; /*XXX*/ 619 goto out2; 620 } 621 622 if (idev->cnf.disable_ipv6) { 623 err = -EACCES; 624 goto out2; 625 } 626 627 spin_lock(&addrconf_hash_lock); 628 629 /* Ignore adding duplicate addresses on an interface */ 630 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 631 ADBG(("ipv6_add_addr: already assigned\n")); 632 err = -EEXIST; 633 goto out; 634 } 635 636 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 637 638 if (ifa == NULL) { 639 ADBG(("ipv6_add_addr: malloc failed\n")); 640 err = -ENOBUFS; 641 goto out; 642 } 643 644 rt = addrconf_dst_alloc(idev, addr, 0); 645 if (IS_ERR(rt)) { 646 err = PTR_ERR(rt); 647 goto out; 648 } 649 650 ipv6_addr_copy(&ifa->addr, addr); 651 652 spin_lock_init(&ifa->lock); 653 spin_lock_init(&ifa->state_lock); 654 init_timer(&ifa->timer); 655 INIT_HLIST_NODE(&ifa->addr_lst); 656 ifa->timer.data = (unsigned long) ifa; 657 ifa->scope = scope; 658 ifa->prefix_len = pfxlen; 659 ifa->flags = flags | IFA_F_TENTATIVE; 660 ifa->cstamp = ifa->tstamp = jiffies; 661 662 ifa->rt = rt; 663 664 /* 665 * part one of RFC 4429, section 3.3 666 * We should not configure an address as 667 * optimistic if we do not yet know the link 668 * layer address of our nexhop router 669 */ 670 671 if (rt->rt6i_nexthop == NULL) 672 ifa->flags &= ~IFA_F_OPTIMISTIC; 673 674 ifa->idev = idev; 675 in6_dev_hold(idev); 676 /* For caller */ 677 in6_ifa_hold(ifa); 678 679 /* Add to big hash table */ 680 hash = ipv6_addr_hash(addr); 681 682 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 683 spin_unlock(&addrconf_hash_lock); 684 685 write_lock(&idev->lock); 686 /* Add to inet6_dev unicast addr list. */ 687 ipv6_link_dev_addr(idev, ifa); 688 689 #ifdef CONFIG_IPV6_PRIVACY 690 if (ifa->flags&IFA_F_TEMPORARY) { 691 list_add(&ifa->tmp_list, &idev->tempaddr_list); 692 in6_ifa_hold(ifa); 693 } 694 #endif 695 696 in6_ifa_hold(ifa); 697 write_unlock(&idev->lock); 698 out2: 699 rcu_read_unlock_bh(); 700 701 if (likely(err == 0)) 702 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 703 else { 704 kfree(ifa); 705 ifa = ERR_PTR(err); 706 } 707 708 return ifa; 709 out: 710 spin_unlock(&addrconf_hash_lock); 711 goto out2; 712 } 713 714 /* This function wants to get referenced ifp and releases it before return */ 715 716 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 717 { 718 struct inet6_ifaddr *ifa, *ifn; 719 struct inet6_dev *idev = ifp->idev; 720 int state; 721 int hash; 722 int deleted = 0, onlink = 0; 723 unsigned long expires = jiffies; 724 725 hash = ipv6_addr_hash(&ifp->addr); 726 727 spin_lock_bh(&ifp->state_lock); 728 state = ifp->state; 729 ifp->state = INET6_IFADDR_STATE_DEAD; 730 spin_unlock_bh(&ifp->state_lock); 731 732 if (state == INET6_IFADDR_STATE_DEAD) 733 goto out; 734 735 spin_lock_bh(&addrconf_hash_lock); 736 hlist_del_init_rcu(&ifp->addr_lst); 737 spin_unlock_bh(&addrconf_hash_lock); 738 739 write_lock_bh(&idev->lock); 740 #ifdef CONFIG_IPV6_PRIVACY 741 if (ifp->flags&IFA_F_TEMPORARY) { 742 list_del(&ifp->tmp_list); 743 if (ifp->ifpub) { 744 in6_ifa_put(ifp->ifpub); 745 ifp->ifpub = NULL; 746 } 747 __in6_ifa_put(ifp); 748 } 749 #endif 750 751 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 752 if (ifa == ifp) { 753 list_del_init(&ifp->if_list); 754 __in6_ifa_put(ifp); 755 756 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 757 break; 758 deleted = 1; 759 continue; 760 } else if (ifp->flags & IFA_F_PERMANENT) { 761 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 762 ifp->prefix_len)) { 763 if (ifa->flags & IFA_F_PERMANENT) { 764 onlink = 1; 765 if (deleted) 766 break; 767 } else { 768 unsigned long lifetime; 769 770 if (!onlink) 771 onlink = -1; 772 773 spin_lock(&ifa->lock); 774 775 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 776 /* 777 * Note: Because this address is 778 * not permanent, lifetime < 779 * LONG_MAX / HZ here. 780 */ 781 if (time_before(expires, 782 ifa->tstamp + lifetime * HZ)) 783 expires = ifa->tstamp + lifetime * HZ; 784 spin_unlock(&ifa->lock); 785 } 786 } 787 } 788 } 789 write_unlock_bh(&idev->lock); 790 791 addrconf_del_timer(ifp); 792 793 ipv6_ifa_notify(RTM_DELADDR, ifp); 794 795 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 796 797 /* 798 * Purge or update corresponding prefix 799 * 800 * 1) we don't purge prefix here if address was not permanent. 801 * prefix is managed by its own lifetime. 802 * 2) if there're no addresses, delete prefix. 803 * 3) if there're still other permanent address(es), 804 * corresponding prefix is still permanent. 805 * 4) otherwise, update prefix lifetime to the 806 * longest valid lifetime among the corresponding 807 * addresses on the device. 808 * Note: subsequent RA will update lifetime. 809 * 810 * --yoshfuji 811 */ 812 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 813 struct in6_addr prefix; 814 struct rt6_info *rt; 815 struct net *net = dev_net(ifp->idev->dev); 816 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 817 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 818 819 if (rt && addrconf_is_prefix_route(rt)) { 820 if (onlink == 0) { 821 ip6_del_rt(rt); 822 rt = NULL; 823 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 824 rt->rt6i_expires = expires; 825 rt->rt6i_flags |= RTF_EXPIRES; 826 } 827 } 828 dst_release(&rt->dst); 829 } 830 831 out: 832 in6_ifa_put(ifp); 833 } 834 835 #ifdef CONFIG_IPV6_PRIVACY 836 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 837 { 838 struct inet6_dev *idev = ifp->idev; 839 struct in6_addr addr, *tmpaddr; 840 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age; 841 unsigned long regen_advance; 842 int tmp_plen; 843 int ret = 0; 844 int max_addresses; 845 u32 addr_flags; 846 847 write_lock(&idev->lock); 848 if (ift) { 849 spin_lock_bh(&ift->lock); 850 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 851 spin_unlock_bh(&ift->lock); 852 tmpaddr = &addr; 853 } else { 854 tmpaddr = NULL; 855 } 856 retry: 857 in6_dev_hold(idev); 858 if (idev->cnf.use_tempaddr <= 0) { 859 write_unlock(&idev->lock); 860 printk(KERN_INFO 861 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 862 in6_dev_put(idev); 863 ret = -1; 864 goto out; 865 } 866 spin_lock_bh(&ifp->lock); 867 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 868 idev->cnf.use_tempaddr = -1; /*XXX*/ 869 spin_unlock_bh(&ifp->lock); 870 write_unlock(&idev->lock); 871 printk(KERN_WARNING 872 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 873 in6_dev_put(idev); 874 ret = -1; 875 goto out; 876 } 877 in6_ifa_hold(ifp); 878 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 879 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 880 spin_unlock_bh(&ifp->lock); 881 write_unlock(&idev->lock); 882 printk(KERN_WARNING 883 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 884 in6_ifa_put(ifp); 885 in6_dev_put(idev); 886 ret = -1; 887 goto out; 888 } 889 memcpy(&addr.s6_addr[8], idev->rndid, 8); 890 age = (jiffies - ifp->tstamp) / HZ; 891 tmp_valid_lft = min_t(__u32, 892 ifp->valid_lft, 893 idev->cnf.temp_valid_lft + age); 894 tmp_prefered_lft = min_t(__u32, 895 ifp->prefered_lft, 896 idev->cnf.temp_prefered_lft + age - 897 idev->cnf.max_desync_factor); 898 tmp_plen = ifp->prefix_len; 899 max_addresses = idev->cnf.max_addresses; 900 tmp_cstamp = ifp->cstamp; 901 tmp_tstamp = ifp->tstamp; 902 spin_unlock_bh(&ifp->lock); 903 904 regen_advance = idev->cnf.regen_max_retry * 905 idev->cnf.dad_transmits * 906 idev->nd_parms->retrans_time / HZ; 907 write_unlock(&idev->lock); 908 909 /* A temporary address is created only if this calculated Preferred 910 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 911 * an implementation must not create a temporary address with a zero 912 * Preferred Lifetime. 913 */ 914 if (tmp_prefered_lft <= regen_advance) { 915 in6_ifa_put(ifp); 916 in6_dev_put(idev); 917 ret = -1; 918 goto out; 919 } 920 921 addr_flags = IFA_F_TEMPORARY; 922 /* set in addrconf_prefix_rcv() */ 923 if (ifp->flags & IFA_F_OPTIMISTIC) 924 addr_flags |= IFA_F_OPTIMISTIC; 925 926 ift = !max_addresses || 927 ipv6_count_addresses(idev) < max_addresses ? 928 ipv6_add_addr(idev, &addr, tmp_plen, 929 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 930 addr_flags) : NULL; 931 if (!ift || IS_ERR(ift)) { 932 in6_ifa_put(ifp); 933 in6_dev_put(idev); 934 printk(KERN_INFO 935 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 936 tmpaddr = &addr; 937 write_lock(&idev->lock); 938 goto retry; 939 } 940 941 spin_lock_bh(&ift->lock); 942 ift->ifpub = ifp; 943 ift->valid_lft = tmp_valid_lft; 944 ift->prefered_lft = tmp_prefered_lft; 945 ift->cstamp = tmp_cstamp; 946 ift->tstamp = tmp_tstamp; 947 spin_unlock_bh(&ift->lock); 948 949 addrconf_dad_start(ift, 0); 950 in6_ifa_put(ift); 951 in6_dev_put(idev); 952 out: 953 return ret; 954 } 955 #endif 956 957 /* 958 * Choose an appropriate source address (RFC3484) 959 */ 960 enum { 961 IPV6_SADDR_RULE_INIT = 0, 962 IPV6_SADDR_RULE_LOCAL, 963 IPV6_SADDR_RULE_SCOPE, 964 IPV6_SADDR_RULE_PREFERRED, 965 #ifdef CONFIG_IPV6_MIP6 966 IPV6_SADDR_RULE_HOA, 967 #endif 968 IPV6_SADDR_RULE_OIF, 969 IPV6_SADDR_RULE_LABEL, 970 #ifdef CONFIG_IPV6_PRIVACY 971 IPV6_SADDR_RULE_PRIVACY, 972 #endif 973 IPV6_SADDR_RULE_ORCHID, 974 IPV6_SADDR_RULE_PREFIX, 975 IPV6_SADDR_RULE_MAX 976 }; 977 978 struct ipv6_saddr_score { 979 int rule; 980 int addr_type; 981 struct inet6_ifaddr *ifa; 982 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 983 int scopedist; 984 int matchlen; 985 }; 986 987 struct ipv6_saddr_dst { 988 const struct in6_addr *addr; 989 int ifindex; 990 int scope; 991 int label; 992 unsigned int prefs; 993 }; 994 995 static inline int ipv6_saddr_preferred(int type) 996 { 997 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 998 return 1; 999 return 0; 1000 } 1001 1002 static int ipv6_get_saddr_eval(struct net *net, 1003 struct ipv6_saddr_score *score, 1004 struct ipv6_saddr_dst *dst, 1005 int i) 1006 { 1007 int ret; 1008 1009 if (i <= score->rule) { 1010 switch (i) { 1011 case IPV6_SADDR_RULE_SCOPE: 1012 ret = score->scopedist; 1013 break; 1014 case IPV6_SADDR_RULE_PREFIX: 1015 ret = score->matchlen; 1016 break; 1017 default: 1018 ret = !!test_bit(i, score->scorebits); 1019 } 1020 goto out; 1021 } 1022 1023 switch (i) { 1024 case IPV6_SADDR_RULE_INIT: 1025 /* Rule 0: remember if hiscore is not ready yet */ 1026 ret = !!score->ifa; 1027 break; 1028 case IPV6_SADDR_RULE_LOCAL: 1029 /* Rule 1: Prefer same address */ 1030 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1031 break; 1032 case IPV6_SADDR_RULE_SCOPE: 1033 /* Rule 2: Prefer appropriate scope 1034 * 1035 * ret 1036 * ^ 1037 * -1 | d 15 1038 * ---+--+-+---> scope 1039 * | 1040 * | d is scope of the destination. 1041 * B-d | \ 1042 * | \ <- smaller scope is better if 1043 * B-15 | \ if scope is enough for destinaion. 1044 * | ret = B - scope (-1 <= scope >= d <= 15). 1045 * d-C-1 | / 1046 * |/ <- greater is better 1047 * -C / if scope is not enough for destination. 1048 * /| ret = scope - C (-1 <= d < scope <= 15). 1049 * 1050 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1051 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1052 * Assume B = 0 and we get C > 29. 1053 */ 1054 ret = __ipv6_addr_src_scope(score->addr_type); 1055 if (ret >= dst->scope) 1056 ret = -ret; 1057 else 1058 ret -= 128; /* 30 is enough */ 1059 score->scopedist = ret; 1060 break; 1061 case IPV6_SADDR_RULE_PREFERRED: 1062 /* Rule 3: Avoid deprecated and optimistic addresses */ 1063 ret = ipv6_saddr_preferred(score->addr_type) || 1064 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1065 break; 1066 #ifdef CONFIG_IPV6_MIP6 1067 case IPV6_SADDR_RULE_HOA: 1068 { 1069 /* Rule 4: Prefer home address */ 1070 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1071 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1072 break; 1073 } 1074 #endif 1075 case IPV6_SADDR_RULE_OIF: 1076 /* Rule 5: Prefer outgoing interface */ 1077 ret = (!dst->ifindex || 1078 dst->ifindex == score->ifa->idev->dev->ifindex); 1079 break; 1080 case IPV6_SADDR_RULE_LABEL: 1081 /* Rule 6: Prefer matching label */ 1082 ret = ipv6_addr_label(net, 1083 &score->ifa->addr, score->addr_type, 1084 score->ifa->idev->dev->ifindex) == dst->label; 1085 break; 1086 #ifdef CONFIG_IPV6_PRIVACY 1087 case IPV6_SADDR_RULE_PRIVACY: 1088 { 1089 /* Rule 7: Prefer public address 1090 * Note: prefer temprary address if use_tempaddr >= 2 1091 */ 1092 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1093 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1094 score->ifa->idev->cnf.use_tempaddr >= 2; 1095 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1096 break; 1097 } 1098 #endif 1099 case IPV6_SADDR_RULE_ORCHID: 1100 /* Rule 8-: Prefer ORCHID vs ORCHID or 1101 * non-ORCHID vs non-ORCHID 1102 */ 1103 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1104 ipv6_addr_orchid(dst->addr)); 1105 break; 1106 case IPV6_SADDR_RULE_PREFIX: 1107 /* Rule 8: Use longest matching prefix */ 1108 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1109 dst->addr); 1110 break; 1111 default: 1112 ret = 0; 1113 } 1114 1115 if (ret) 1116 __set_bit(i, score->scorebits); 1117 score->rule = i; 1118 out: 1119 return ret; 1120 } 1121 1122 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1123 const struct in6_addr *daddr, unsigned int prefs, 1124 struct in6_addr *saddr) 1125 { 1126 struct ipv6_saddr_score scores[2], 1127 *score = &scores[0], *hiscore = &scores[1]; 1128 struct ipv6_saddr_dst dst; 1129 struct net_device *dev; 1130 int dst_type; 1131 1132 dst_type = __ipv6_addr_type(daddr); 1133 dst.addr = daddr; 1134 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1135 dst.scope = __ipv6_addr_src_scope(dst_type); 1136 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1137 dst.prefs = prefs; 1138 1139 hiscore->rule = -1; 1140 hiscore->ifa = NULL; 1141 1142 rcu_read_lock(); 1143 1144 for_each_netdev_rcu(net, dev) { 1145 struct inet6_dev *idev; 1146 1147 /* Candidate Source Address (section 4) 1148 * - multicast and link-local destination address, 1149 * the set of candidate source address MUST only 1150 * include addresses assigned to interfaces 1151 * belonging to the same link as the outgoing 1152 * interface. 1153 * (- For site-local destination addresses, the 1154 * set of candidate source addresses MUST only 1155 * include addresses assigned to interfaces 1156 * belonging to the same site as the outgoing 1157 * interface.) 1158 */ 1159 if (((dst_type & IPV6_ADDR_MULTICAST) || 1160 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1161 dst.ifindex && dev->ifindex != dst.ifindex) 1162 continue; 1163 1164 idev = __in6_dev_get(dev); 1165 if (!idev) 1166 continue; 1167 1168 read_lock_bh(&idev->lock); 1169 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1170 int i; 1171 1172 /* 1173 * - Tentative Address (RFC2462 section 5.4) 1174 * - A tentative address is not considered 1175 * "assigned to an interface" in the traditional 1176 * sense, unless it is also flagged as optimistic. 1177 * - Candidate Source Address (section 4) 1178 * - In any case, anycast addresses, multicast 1179 * addresses, and the unspecified address MUST 1180 * NOT be included in a candidate set. 1181 */ 1182 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1183 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1184 continue; 1185 1186 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1187 1188 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1189 score->addr_type & IPV6_ADDR_MULTICAST)) { 1190 LIMIT_NETDEBUG(KERN_DEBUG 1191 "ADDRCONF: unspecified / multicast address " 1192 "assigned as unicast address on %s", 1193 dev->name); 1194 continue; 1195 } 1196 1197 score->rule = -1; 1198 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1199 1200 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1201 int minihiscore, miniscore; 1202 1203 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1204 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1205 1206 if (minihiscore > miniscore) { 1207 if (i == IPV6_SADDR_RULE_SCOPE && 1208 score->scopedist > 0) { 1209 /* 1210 * special case: 1211 * each remaining entry 1212 * has too small (not enough) 1213 * scope, because ifa entries 1214 * are sorted by their scope 1215 * values. 1216 */ 1217 goto try_nextdev; 1218 } 1219 break; 1220 } else if (minihiscore < miniscore) { 1221 if (hiscore->ifa) 1222 in6_ifa_put(hiscore->ifa); 1223 1224 in6_ifa_hold(score->ifa); 1225 1226 swap(hiscore, score); 1227 1228 /* restore our iterator */ 1229 score->ifa = hiscore->ifa; 1230 1231 break; 1232 } 1233 } 1234 } 1235 try_nextdev: 1236 read_unlock_bh(&idev->lock); 1237 } 1238 rcu_read_unlock(); 1239 1240 if (!hiscore->ifa) 1241 return -EADDRNOTAVAIL; 1242 1243 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1244 in6_ifa_put(hiscore->ifa); 1245 return 0; 1246 } 1247 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1248 1249 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1250 unsigned char banned_flags) 1251 { 1252 struct inet6_dev *idev; 1253 int err = -EADDRNOTAVAIL; 1254 1255 rcu_read_lock(); 1256 idev = __in6_dev_get(dev); 1257 if (idev) { 1258 struct inet6_ifaddr *ifp; 1259 1260 read_lock_bh(&idev->lock); 1261 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1262 if (ifp->scope == IFA_LINK && 1263 !(ifp->flags & banned_flags)) { 1264 ipv6_addr_copy(addr, &ifp->addr); 1265 err = 0; 1266 break; 1267 } 1268 } 1269 read_unlock_bh(&idev->lock); 1270 } 1271 rcu_read_unlock(); 1272 return err; 1273 } 1274 1275 static int ipv6_count_addresses(struct inet6_dev *idev) 1276 { 1277 int cnt = 0; 1278 struct inet6_ifaddr *ifp; 1279 1280 read_lock_bh(&idev->lock); 1281 list_for_each_entry(ifp, &idev->addr_list, if_list) 1282 cnt++; 1283 read_unlock_bh(&idev->lock); 1284 return cnt; 1285 } 1286 1287 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1288 struct net_device *dev, int strict) 1289 { 1290 struct inet6_ifaddr *ifp; 1291 struct hlist_node *node; 1292 unsigned int hash = ipv6_addr_hash(addr); 1293 1294 rcu_read_lock_bh(); 1295 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1296 if (!net_eq(dev_net(ifp->idev->dev), net)) 1297 continue; 1298 if (ipv6_addr_equal(&ifp->addr, addr) && 1299 !(ifp->flags&IFA_F_TENTATIVE) && 1300 (dev == NULL || ifp->idev->dev == dev || 1301 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1302 rcu_read_unlock_bh(); 1303 return 1; 1304 } 1305 } 1306 1307 rcu_read_unlock_bh(); 1308 return 0; 1309 } 1310 EXPORT_SYMBOL(ipv6_chk_addr); 1311 1312 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1313 struct net_device *dev) 1314 { 1315 unsigned int hash = ipv6_addr_hash(addr); 1316 struct inet6_ifaddr *ifp; 1317 struct hlist_node *node; 1318 1319 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1320 if (!net_eq(dev_net(ifp->idev->dev), net)) 1321 continue; 1322 if (ipv6_addr_equal(&ifp->addr, addr)) { 1323 if (dev == NULL || ifp->idev->dev == dev) 1324 return true; 1325 } 1326 } 1327 return false; 1328 } 1329 1330 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) 1331 { 1332 struct inet6_dev *idev; 1333 struct inet6_ifaddr *ifa; 1334 int onlink; 1335 1336 onlink = 0; 1337 rcu_read_lock(); 1338 idev = __in6_dev_get(dev); 1339 if (idev) { 1340 read_lock_bh(&idev->lock); 1341 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1342 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1343 ifa->prefix_len); 1344 if (onlink) 1345 break; 1346 } 1347 read_unlock_bh(&idev->lock); 1348 } 1349 rcu_read_unlock(); 1350 return onlink; 1351 } 1352 1353 EXPORT_SYMBOL(ipv6_chk_prefix); 1354 1355 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1356 struct net_device *dev, int strict) 1357 { 1358 struct inet6_ifaddr *ifp, *result = NULL; 1359 unsigned int hash = ipv6_addr_hash(addr); 1360 struct hlist_node *node; 1361 1362 rcu_read_lock_bh(); 1363 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1364 if (!net_eq(dev_net(ifp->idev->dev), net)) 1365 continue; 1366 if (ipv6_addr_equal(&ifp->addr, addr)) { 1367 if (dev == NULL || ifp->idev->dev == dev || 1368 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1369 result = ifp; 1370 in6_ifa_hold(ifp); 1371 break; 1372 } 1373 } 1374 } 1375 rcu_read_unlock_bh(); 1376 1377 return result; 1378 } 1379 1380 /* Gets referenced address, destroys ifaddr */ 1381 1382 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1383 { 1384 if (ifp->flags&IFA_F_PERMANENT) { 1385 spin_lock_bh(&ifp->lock); 1386 addrconf_del_timer(ifp); 1387 ifp->flags |= IFA_F_TENTATIVE; 1388 if (dad_failed) 1389 ifp->flags |= IFA_F_DADFAILED; 1390 spin_unlock_bh(&ifp->lock); 1391 if (dad_failed) 1392 ipv6_ifa_notify(0, ifp); 1393 in6_ifa_put(ifp); 1394 #ifdef CONFIG_IPV6_PRIVACY 1395 } else if (ifp->flags&IFA_F_TEMPORARY) { 1396 struct inet6_ifaddr *ifpub; 1397 spin_lock_bh(&ifp->lock); 1398 ifpub = ifp->ifpub; 1399 if (ifpub) { 1400 in6_ifa_hold(ifpub); 1401 spin_unlock_bh(&ifp->lock); 1402 ipv6_create_tempaddr(ifpub, ifp); 1403 in6_ifa_put(ifpub); 1404 } else { 1405 spin_unlock_bh(&ifp->lock); 1406 } 1407 ipv6_del_addr(ifp); 1408 #endif 1409 } else 1410 ipv6_del_addr(ifp); 1411 } 1412 1413 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1414 { 1415 int err = -ENOENT; 1416 1417 spin_lock(&ifp->state_lock); 1418 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1419 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1420 err = 0; 1421 } 1422 spin_unlock(&ifp->state_lock); 1423 1424 return err; 1425 } 1426 1427 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1428 { 1429 struct inet6_dev *idev = ifp->idev; 1430 1431 if (addrconf_dad_end(ifp)) { 1432 in6_ifa_put(ifp); 1433 return; 1434 } 1435 1436 if (net_ratelimit()) 1437 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1438 ifp->idev->dev->name, &ifp->addr); 1439 1440 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1441 struct in6_addr addr; 1442 1443 addr.s6_addr32[0] = htonl(0xfe800000); 1444 addr.s6_addr32[1] = 0; 1445 1446 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1447 ipv6_addr_equal(&ifp->addr, &addr)) { 1448 /* DAD failed for link-local based on MAC address */ 1449 idev->cnf.disable_ipv6 = 1; 1450 1451 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1452 ifp->idev->dev->name); 1453 } 1454 } 1455 1456 addrconf_dad_stop(ifp, 1); 1457 } 1458 1459 /* Join to solicited addr multicast group. */ 1460 1461 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1462 { 1463 struct in6_addr maddr; 1464 1465 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1466 return; 1467 1468 addrconf_addr_solict_mult(addr, &maddr); 1469 ipv6_dev_mc_inc(dev, &maddr); 1470 } 1471 1472 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1473 { 1474 struct in6_addr maddr; 1475 1476 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1477 return; 1478 1479 addrconf_addr_solict_mult(addr, &maddr); 1480 __ipv6_dev_mc_dec(idev, &maddr); 1481 } 1482 1483 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1484 { 1485 struct in6_addr addr; 1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1487 if (ipv6_addr_any(&addr)) 1488 return; 1489 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1490 } 1491 1492 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1493 { 1494 struct in6_addr addr; 1495 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1496 if (ipv6_addr_any(&addr)) 1497 return; 1498 __ipv6_dev_ac_dec(ifp->idev, &addr); 1499 } 1500 1501 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1502 { 1503 if (dev->addr_len != ETH_ALEN) 1504 return -1; 1505 memcpy(eui, dev->dev_addr, 3); 1506 memcpy(eui + 5, dev->dev_addr + 3, 3); 1507 1508 /* 1509 * The zSeries OSA network cards can be shared among various 1510 * OS instances, but the OSA cards have only one MAC address. 1511 * This leads to duplicate address conflicts in conjunction 1512 * with IPv6 if more than one instance uses the same card. 1513 * 1514 * The driver for these cards can deliver a unique 16-bit 1515 * identifier for each instance sharing the same card. It is 1516 * placed instead of 0xFFFE in the interface identifier. The 1517 * "u" bit of the interface identifier is not inverted in this 1518 * case. Hence the resulting interface identifier has local 1519 * scope according to RFC2373. 1520 */ 1521 if (dev->dev_id) { 1522 eui[3] = (dev->dev_id >> 8) & 0xFF; 1523 eui[4] = dev->dev_id & 0xFF; 1524 } else { 1525 eui[3] = 0xFF; 1526 eui[4] = 0xFE; 1527 eui[0] ^= 2; 1528 } 1529 return 0; 1530 } 1531 1532 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1533 { 1534 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1535 if (dev->addr_len != ARCNET_ALEN) 1536 return -1; 1537 memset(eui, 0, 7); 1538 eui[7] = *(u8*)dev->dev_addr; 1539 return 0; 1540 } 1541 1542 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1543 { 1544 if (dev->addr_len != INFINIBAND_ALEN) 1545 return -1; 1546 memcpy(eui, dev->dev_addr + 12, 8); 1547 eui[0] |= 2; 1548 return 0; 1549 } 1550 1551 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1552 { 1553 if (addr == 0) 1554 return -1; 1555 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1556 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1557 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1558 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1559 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1560 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1561 eui[1] = 0; 1562 eui[2] = 0x5E; 1563 eui[3] = 0xFE; 1564 memcpy(eui + 4, &addr, 4); 1565 return 0; 1566 } 1567 1568 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1569 { 1570 if (dev->priv_flags & IFF_ISATAP) 1571 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1572 return -1; 1573 } 1574 1575 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1576 { 1577 switch (dev->type) { 1578 case ARPHRD_ETHER: 1579 case ARPHRD_FDDI: 1580 case ARPHRD_IEEE802_TR: 1581 return addrconf_ifid_eui48(eui, dev); 1582 case ARPHRD_ARCNET: 1583 return addrconf_ifid_arcnet(eui, dev); 1584 case ARPHRD_INFINIBAND: 1585 return addrconf_ifid_infiniband(eui, dev); 1586 case ARPHRD_SIT: 1587 return addrconf_ifid_sit(eui, dev); 1588 } 1589 return -1; 1590 } 1591 1592 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1593 { 1594 int err = -1; 1595 struct inet6_ifaddr *ifp; 1596 1597 read_lock_bh(&idev->lock); 1598 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1599 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1600 memcpy(eui, ifp->addr.s6_addr+8, 8); 1601 err = 0; 1602 break; 1603 } 1604 } 1605 read_unlock_bh(&idev->lock); 1606 return err; 1607 } 1608 1609 #ifdef CONFIG_IPV6_PRIVACY 1610 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1611 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1612 { 1613 regen: 1614 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1615 idev->rndid[0] &= ~0x02; 1616 1617 /* 1618 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1619 * check if generated address is not inappropriate 1620 * 1621 * - Reserved subnet anycast (RFC 2526) 1622 * 11111101 11....11 1xxxxxxx 1623 * - ISATAP (RFC4214) 6.1 1624 * 00-00-5E-FE-xx-xx-xx-xx 1625 * - value 0 1626 * - XXX: already assigned to an address on the device 1627 */ 1628 if (idev->rndid[0] == 0xfd && 1629 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1630 (idev->rndid[7]&0x80)) 1631 goto regen; 1632 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1633 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1634 goto regen; 1635 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1636 goto regen; 1637 } 1638 1639 return 0; 1640 } 1641 1642 static void ipv6_regen_rndid(unsigned long data) 1643 { 1644 struct inet6_dev *idev = (struct inet6_dev *) data; 1645 unsigned long expires; 1646 1647 rcu_read_lock_bh(); 1648 write_lock_bh(&idev->lock); 1649 1650 if (idev->dead) 1651 goto out; 1652 1653 if (__ipv6_regen_rndid(idev) < 0) 1654 goto out; 1655 1656 expires = jiffies + 1657 idev->cnf.temp_prefered_lft * HZ - 1658 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1659 idev->cnf.max_desync_factor * HZ; 1660 if (time_before(expires, jiffies)) { 1661 printk(KERN_WARNING 1662 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1663 idev->dev->name); 1664 goto out; 1665 } 1666 1667 if (!mod_timer(&idev->regen_timer, expires)) 1668 in6_dev_hold(idev); 1669 1670 out: 1671 write_unlock_bh(&idev->lock); 1672 rcu_read_unlock_bh(); 1673 in6_dev_put(idev); 1674 } 1675 1676 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1677 int ret = 0; 1678 1679 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1680 ret = __ipv6_regen_rndid(idev); 1681 return ret; 1682 } 1683 #endif 1684 1685 /* 1686 * Add prefix route. 1687 */ 1688 1689 static void 1690 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1691 unsigned long expires, u32 flags) 1692 { 1693 struct fib6_config cfg = { 1694 .fc_table = RT6_TABLE_PREFIX, 1695 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1696 .fc_ifindex = dev->ifindex, 1697 .fc_expires = expires, 1698 .fc_dst_len = plen, 1699 .fc_flags = RTF_UP | flags, 1700 .fc_nlinfo.nl_net = dev_net(dev), 1701 .fc_protocol = RTPROT_KERNEL, 1702 }; 1703 1704 ipv6_addr_copy(&cfg.fc_dst, pfx); 1705 1706 /* Prevent useless cloning on PtP SIT. 1707 This thing is done here expecting that the whole 1708 class of non-broadcast devices need not cloning. 1709 */ 1710 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1711 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1712 cfg.fc_flags |= RTF_NONEXTHOP; 1713 #endif 1714 1715 ip6_route_add(&cfg); 1716 } 1717 1718 /* Create "default" multicast route to the interface */ 1719 1720 static void addrconf_add_mroute(struct net_device *dev) 1721 { 1722 struct fib6_config cfg = { 1723 .fc_table = RT6_TABLE_LOCAL, 1724 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1725 .fc_ifindex = dev->ifindex, 1726 .fc_dst_len = 8, 1727 .fc_flags = RTF_UP, 1728 .fc_nlinfo.nl_net = dev_net(dev), 1729 }; 1730 1731 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1732 1733 ip6_route_add(&cfg); 1734 } 1735 1736 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1737 static void sit_route_add(struct net_device *dev) 1738 { 1739 struct fib6_config cfg = { 1740 .fc_table = RT6_TABLE_MAIN, 1741 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1742 .fc_ifindex = dev->ifindex, 1743 .fc_dst_len = 96, 1744 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1745 .fc_nlinfo.nl_net = dev_net(dev), 1746 }; 1747 1748 /* prefix length - 96 bits "::d.d.d.d" */ 1749 ip6_route_add(&cfg); 1750 } 1751 #endif 1752 1753 static void addrconf_add_lroute(struct net_device *dev) 1754 { 1755 struct in6_addr addr; 1756 1757 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1758 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1759 } 1760 1761 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1762 { 1763 struct inet6_dev *idev; 1764 1765 ASSERT_RTNL(); 1766 1767 idev = ipv6_find_idev(dev); 1768 if (!idev) 1769 return ERR_PTR(-ENOBUFS); 1770 1771 if (idev->cnf.disable_ipv6) 1772 return ERR_PTR(-EACCES); 1773 1774 /* Add default multicast route */ 1775 addrconf_add_mroute(dev); 1776 1777 /* Add link local route */ 1778 addrconf_add_lroute(dev); 1779 return idev; 1780 } 1781 1782 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1783 { 1784 struct prefix_info *pinfo; 1785 __u32 valid_lft; 1786 __u32 prefered_lft; 1787 int addr_type; 1788 struct inet6_dev *in6_dev; 1789 struct net *net = dev_net(dev); 1790 1791 pinfo = (struct prefix_info *) opt; 1792 1793 if (len < sizeof(struct prefix_info)) { 1794 ADBG(("addrconf: prefix option too short\n")); 1795 return; 1796 } 1797 1798 /* 1799 * Validation checks ([ADDRCONF], page 19) 1800 */ 1801 1802 addr_type = ipv6_addr_type(&pinfo->prefix); 1803 1804 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1805 return; 1806 1807 valid_lft = ntohl(pinfo->valid); 1808 prefered_lft = ntohl(pinfo->prefered); 1809 1810 if (prefered_lft > valid_lft) { 1811 if (net_ratelimit()) 1812 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1813 return; 1814 } 1815 1816 in6_dev = in6_dev_get(dev); 1817 1818 if (in6_dev == NULL) { 1819 if (net_ratelimit()) 1820 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1821 return; 1822 } 1823 1824 /* 1825 * Two things going on here: 1826 * 1) Add routes for on-link prefixes 1827 * 2) Configure prefixes with the auto flag set 1828 */ 1829 1830 if (pinfo->onlink) { 1831 struct rt6_info *rt; 1832 unsigned long rt_expires; 1833 1834 /* Avoid arithmetic overflow. Really, we could 1835 * save rt_expires in seconds, likely valid_lft, 1836 * but it would require division in fib gc, that it 1837 * not good. 1838 */ 1839 if (HZ > USER_HZ) 1840 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1841 else 1842 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1843 1844 if (addrconf_finite_timeout(rt_expires)) 1845 rt_expires *= HZ; 1846 1847 rt = rt6_lookup(net, &pinfo->prefix, NULL, 1848 dev->ifindex, 1); 1849 1850 if (rt && addrconf_is_prefix_route(rt)) { 1851 /* Autoconf prefix route */ 1852 if (valid_lft == 0) { 1853 ip6_del_rt(rt); 1854 rt = NULL; 1855 } else if (addrconf_finite_timeout(rt_expires)) { 1856 /* not infinity */ 1857 rt->rt6i_expires = jiffies + rt_expires; 1858 rt->rt6i_flags |= RTF_EXPIRES; 1859 } else { 1860 rt->rt6i_flags &= ~RTF_EXPIRES; 1861 rt->rt6i_expires = 0; 1862 } 1863 } else if (valid_lft) { 1864 clock_t expires = 0; 1865 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1866 if (addrconf_finite_timeout(rt_expires)) { 1867 /* not infinity */ 1868 flags |= RTF_EXPIRES; 1869 expires = jiffies_to_clock_t(rt_expires); 1870 } 1871 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1872 dev, expires, flags); 1873 } 1874 if (rt) 1875 dst_release(&rt->dst); 1876 } 1877 1878 /* Try to figure out our local address for this prefix */ 1879 1880 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1881 struct inet6_ifaddr * ifp; 1882 struct in6_addr addr; 1883 int create = 0, update_lft = 0; 1884 1885 if (pinfo->prefix_len == 64) { 1886 memcpy(&addr, &pinfo->prefix, 8); 1887 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1888 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1889 in6_dev_put(in6_dev); 1890 return; 1891 } 1892 goto ok; 1893 } 1894 if (net_ratelimit()) 1895 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1896 pinfo->prefix_len); 1897 in6_dev_put(in6_dev); 1898 return; 1899 1900 ok: 1901 1902 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1903 1904 if (ifp == NULL && valid_lft) { 1905 int max_addresses = in6_dev->cnf.max_addresses; 1906 u32 addr_flags = 0; 1907 1908 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1909 if (in6_dev->cnf.optimistic_dad && 1910 !net->ipv6.devconf_all->forwarding) 1911 addr_flags = IFA_F_OPTIMISTIC; 1912 #endif 1913 1914 /* Do not allow to create too much of autoconfigured 1915 * addresses; this would be too easy way to crash kernel. 1916 */ 1917 if (!max_addresses || 1918 ipv6_count_addresses(in6_dev) < max_addresses) 1919 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1920 addr_type&IPV6_ADDR_SCOPE_MASK, 1921 addr_flags); 1922 1923 if (!ifp || IS_ERR(ifp)) { 1924 in6_dev_put(in6_dev); 1925 return; 1926 } 1927 1928 update_lft = create = 1; 1929 ifp->cstamp = jiffies; 1930 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1931 } 1932 1933 if (ifp) { 1934 int flags; 1935 unsigned long now; 1936 #ifdef CONFIG_IPV6_PRIVACY 1937 struct inet6_ifaddr *ift; 1938 #endif 1939 u32 stored_lft; 1940 1941 /* update lifetime (RFC2462 5.5.3 e) */ 1942 spin_lock(&ifp->lock); 1943 now = jiffies; 1944 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1945 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1946 else 1947 stored_lft = 0; 1948 if (!update_lft && stored_lft) { 1949 if (valid_lft > MIN_VALID_LIFETIME || 1950 valid_lft > stored_lft) 1951 update_lft = 1; 1952 else if (stored_lft <= MIN_VALID_LIFETIME) { 1953 /* valid_lft <= stored_lft is always true */ 1954 /* 1955 * RFC 4862 Section 5.5.3e: 1956 * "Note that the preferred lifetime of 1957 * the corresponding address is always 1958 * reset to the Preferred Lifetime in 1959 * the received Prefix Information 1960 * option, regardless of whether the 1961 * valid lifetime is also reset or 1962 * ignored." 1963 * 1964 * So if the preferred lifetime in 1965 * this advertisement is different 1966 * than what we have stored, but the 1967 * valid lifetime is invalid, just 1968 * reset prefered_lft. 1969 * 1970 * We must set the valid lifetime 1971 * to the stored lifetime since we'll 1972 * be updating the timestamp below, 1973 * else we'll set it back to the 1974 * minumum. 1975 */ 1976 if (prefered_lft != ifp->prefered_lft) { 1977 valid_lft = stored_lft; 1978 update_lft = 1; 1979 } 1980 } else { 1981 valid_lft = MIN_VALID_LIFETIME; 1982 if (valid_lft < prefered_lft) 1983 prefered_lft = valid_lft; 1984 update_lft = 1; 1985 } 1986 } 1987 1988 if (update_lft) { 1989 ifp->valid_lft = valid_lft; 1990 ifp->prefered_lft = prefered_lft; 1991 ifp->tstamp = now; 1992 flags = ifp->flags; 1993 ifp->flags &= ~IFA_F_DEPRECATED; 1994 spin_unlock(&ifp->lock); 1995 1996 if (!(flags&IFA_F_TENTATIVE)) 1997 ipv6_ifa_notify(0, ifp); 1998 } else 1999 spin_unlock(&ifp->lock); 2000 2001 #ifdef CONFIG_IPV6_PRIVACY 2002 read_lock_bh(&in6_dev->lock); 2003 /* update all temporary addresses in the list */ 2004 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) { 2005 /* 2006 * When adjusting the lifetimes of an existing 2007 * temporary address, only lower the lifetimes. 2008 * Implementations must not increase the 2009 * lifetimes of an existing temporary address 2010 * when processing a Prefix Information Option. 2011 */ 2012 if (ifp != ift->ifpub) 2013 continue; 2014 2015 spin_lock(&ift->lock); 2016 flags = ift->flags; 2017 if (ift->valid_lft > valid_lft && 2018 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 2019 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 2020 if (ift->prefered_lft > prefered_lft && 2021 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 2022 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 2023 spin_unlock(&ift->lock); 2024 if (!(flags&IFA_F_TENTATIVE)) 2025 ipv6_ifa_notify(0, ift); 2026 } 2027 2028 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2029 /* 2030 * When a new public address is created as described in [ADDRCONF], 2031 * also create a new temporary address. Also create a temporary 2032 * address if it's enabled but no temporary address currently exists. 2033 */ 2034 read_unlock_bh(&in6_dev->lock); 2035 ipv6_create_tempaddr(ifp, NULL); 2036 } else { 2037 read_unlock_bh(&in6_dev->lock); 2038 } 2039 #endif 2040 in6_ifa_put(ifp); 2041 addrconf_verify(0); 2042 } 2043 } 2044 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2045 in6_dev_put(in6_dev); 2046 } 2047 2048 /* 2049 * Set destination address. 2050 * Special case for SIT interfaces where we create a new "virtual" 2051 * device. 2052 */ 2053 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2054 { 2055 struct in6_ifreq ireq; 2056 struct net_device *dev; 2057 int err = -EINVAL; 2058 2059 rtnl_lock(); 2060 2061 err = -EFAULT; 2062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2063 goto err_exit; 2064 2065 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2066 2067 err = -ENODEV; 2068 if (dev == NULL) 2069 goto err_exit; 2070 2071 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2072 if (dev->type == ARPHRD_SIT) { 2073 const struct net_device_ops *ops = dev->netdev_ops; 2074 struct ifreq ifr; 2075 struct ip_tunnel_parm p; 2076 2077 err = -EADDRNOTAVAIL; 2078 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2079 goto err_exit; 2080 2081 memset(&p, 0, sizeof(p)); 2082 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2083 p.iph.saddr = 0; 2084 p.iph.version = 4; 2085 p.iph.ihl = 5; 2086 p.iph.protocol = IPPROTO_IPV6; 2087 p.iph.ttl = 64; 2088 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2089 2090 if (ops->ndo_do_ioctl) { 2091 mm_segment_t oldfs = get_fs(); 2092 2093 set_fs(KERNEL_DS); 2094 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2095 set_fs(oldfs); 2096 } else 2097 err = -EOPNOTSUPP; 2098 2099 if (err == 0) { 2100 err = -ENOBUFS; 2101 dev = __dev_get_by_name(net, p.name); 2102 if (!dev) 2103 goto err_exit; 2104 err = dev_open(dev); 2105 } 2106 } 2107 #endif 2108 2109 err_exit: 2110 rtnl_unlock(); 2111 return err; 2112 } 2113 2114 /* 2115 * Manual configuration of address on an interface 2116 */ 2117 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 2118 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2119 __u32 valid_lft) 2120 { 2121 struct inet6_ifaddr *ifp; 2122 struct inet6_dev *idev; 2123 struct net_device *dev; 2124 int scope; 2125 u32 flags; 2126 clock_t expires; 2127 unsigned long timeout; 2128 2129 ASSERT_RTNL(); 2130 2131 if (plen > 128) 2132 return -EINVAL; 2133 2134 /* check the lifetime */ 2135 if (!valid_lft || prefered_lft > valid_lft) 2136 return -EINVAL; 2137 2138 dev = __dev_get_by_index(net, ifindex); 2139 if (!dev) 2140 return -ENODEV; 2141 2142 idev = addrconf_add_dev(dev); 2143 if (IS_ERR(idev)) 2144 return PTR_ERR(idev); 2145 2146 scope = ipv6_addr_scope(pfx); 2147 2148 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2149 if (addrconf_finite_timeout(timeout)) { 2150 expires = jiffies_to_clock_t(timeout * HZ); 2151 valid_lft = timeout; 2152 flags = RTF_EXPIRES; 2153 } else { 2154 expires = 0; 2155 flags = 0; 2156 ifa_flags |= IFA_F_PERMANENT; 2157 } 2158 2159 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2160 if (addrconf_finite_timeout(timeout)) { 2161 if (timeout == 0) 2162 ifa_flags |= IFA_F_DEPRECATED; 2163 prefered_lft = timeout; 2164 } 2165 2166 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2167 2168 if (!IS_ERR(ifp)) { 2169 spin_lock_bh(&ifp->lock); 2170 ifp->valid_lft = valid_lft; 2171 ifp->prefered_lft = prefered_lft; 2172 ifp->tstamp = jiffies; 2173 spin_unlock_bh(&ifp->lock); 2174 2175 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2176 expires, flags); 2177 /* 2178 * Note that section 3.1 of RFC 4429 indicates 2179 * that the Optimistic flag should not be set for 2180 * manually configured addresses 2181 */ 2182 addrconf_dad_start(ifp, 0); 2183 in6_ifa_put(ifp); 2184 addrconf_verify(0); 2185 return 0; 2186 } 2187 2188 return PTR_ERR(ifp); 2189 } 2190 2191 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2192 unsigned int plen) 2193 { 2194 struct inet6_ifaddr *ifp; 2195 struct inet6_dev *idev; 2196 struct net_device *dev; 2197 2198 if (plen > 128) 2199 return -EINVAL; 2200 2201 dev = __dev_get_by_index(net, ifindex); 2202 if (!dev) 2203 return -ENODEV; 2204 2205 if ((idev = __in6_dev_get(dev)) == NULL) 2206 return -ENXIO; 2207 2208 read_lock_bh(&idev->lock); 2209 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2210 if (ifp->prefix_len == plen && 2211 ipv6_addr_equal(pfx, &ifp->addr)) { 2212 in6_ifa_hold(ifp); 2213 read_unlock_bh(&idev->lock); 2214 2215 ipv6_del_addr(ifp); 2216 2217 /* If the last address is deleted administratively, 2218 disable IPv6 on this interface. 2219 */ 2220 if (list_empty(&idev->addr_list)) 2221 addrconf_ifdown(idev->dev, 1); 2222 return 0; 2223 } 2224 } 2225 read_unlock_bh(&idev->lock); 2226 return -EADDRNOTAVAIL; 2227 } 2228 2229 2230 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2231 { 2232 struct in6_ifreq ireq; 2233 int err; 2234 2235 if (!capable(CAP_NET_ADMIN)) 2236 return -EPERM; 2237 2238 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2239 return -EFAULT; 2240 2241 rtnl_lock(); 2242 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2243 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2244 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2245 rtnl_unlock(); 2246 return err; 2247 } 2248 2249 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2250 { 2251 struct in6_ifreq ireq; 2252 int err; 2253 2254 if (!capable(CAP_NET_ADMIN)) 2255 return -EPERM; 2256 2257 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2258 return -EFAULT; 2259 2260 rtnl_lock(); 2261 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2262 ireq.ifr6_prefixlen); 2263 rtnl_unlock(); 2264 return err; 2265 } 2266 2267 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2268 int plen, int scope) 2269 { 2270 struct inet6_ifaddr *ifp; 2271 2272 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2273 if (!IS_ERR(ifp)) { 2274 spin_lock_bh(&ifp->lock); 2275 ifp->flags &= ~IFA_F_TENTATIVE; 2276 spin_unlock_bh(&ifp->lock); 2277 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2278 in6_ifa_put(ifp); 2279 } 2280 } 2281 2282 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2283 static void sit_add_v4_addrs(struct inet6_dev *idev) 2284 { 2285 struct in6_addr addr; 2286 struct net_device *dev; 2287 struct net *net = dev_net(idev->dev); 2288 int scope; 2289 2290 ASSERT_RTNL(); 2291 2292 memset(&addr, 0, sizeof(struct in6_addr)); 2293 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2294 2295 if (idev->dev->flags&IFF_POINTOPOINT) { 2296 addr.s6_addr32[0] = htonl(0xfe800000); 2297 scope = IFA_LINK; 2298 } else { 2299 scope = IPV6_ADDR_COMPATv4; 2300 } 2301 2302 if (addr.s6_addr32[3]) { 2303 add_addr(idev, &addr, 128, scope); 2304 return; 2305 } 2306 2307 for_each_netdev(net, dev) { 2308 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2309 if (in_dev && (dev->flags & IFF_UP)) { 2310 struct in_ifaddr * ifa; 2311 2312 int flag = scope; 2313 2314 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2315 int plen; 2316 2317 addr.s6_addr32[3] = ifa->ifa_local; 2318 2319 if (ifa->ifa_scope == RT_SCOPE_LINK) 2320 continue; 2321 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2322 if (idev->dev->flags&IFF_POINTOPOINT) 2323 continue; 2324 flag |= IFA_HOST; 2325 } 2326 if (idev->dev->flags&IFF_POINTOPOINT) 2327 plen = 64; 2328 else 2329 plen = 96; 2330 2331 add_addr(idev, &addr, plen, flag); 2332 } 2333 } 2334 } 2335 } 2336 #endif 2337 2338 static void init_loopback(struct net_device *dev) 2339 { 2340 struct inet6_dev *idev; 2341 2342 /* ::1 */ 2343 2344 ASSERT_RTNL(); 2345 2346 if ((idev = ipv6_find_idev(dev)) == NULL) { 2347 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2348 return; 2349 } 2350 2351 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2352 } 2353 2354 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2355 { 2356 struct inet6_ifaddr * ifp; 2357 u32 addr_flags = IFA_F_PERMANENT; 2358 2359 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2360 if (idev->cnf.optimistic_dad && 2361 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2362 addr_flags |= IFA_F_OPTIMISTIC; 2363 #endif 2364 2365 2366 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2367 if (!IS_ERR(ifp)) { 2368 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2369 addrconf_dad_start(ifp, 0); 2370 in6_ifa_put(ifp); 2371 } 2372 } 2373 2374 static void addrconf_dev_config(struct net_device *dev) 2375 { 2376 struct in6_addr addr; 2377 struct inet6_dev * idev; 2378 2379 ASSERT_RTNL(); 2380 2381 if ((dev->type != ARPHRD_ETHER) && 2382 (dev->type != ARPHRD_FDDI) && 2383 (dev->type != ARPHRD_IEEE802_TR) && 2384 (dev->type != ARPHRD_ARCNET) && 2385 (dev->type != ARPHRD_INFINIBAND)) { 2386 /* Alas, we support only Ethernet autoconfiguration. */ 2387 return; 2388 } 2389 2390 idev = addrconf_add_dev(dev); 2391 if (IS_ERR(idev)) 2392 return; 2393 2394 memset(&addr, 0, sizeof(struct in6_addr)); 2395 addr.s6_addr32[0] = htonl(0xFE800000); 2396 2397 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2398 addrconf_add_linklocal(idev, &addr); 2399 } 2400 2401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2402 static void addrconf_sit_config(struct net_device *dev) 2403 { 2404 struct inet6_dev *idev; 2405 2406 ASSERT_RTNL(); 2407 2408 /* 2409 * Configure the tunnel with one of our IPv4 2410 * addresses... we should configure all of 2411 * our v4 addrs in the tunnel 2412 */ 2413 2414 if ((idev = ipv6_find_idev(dev)) == NULL) { 2415 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2416 return; 2417 } 2418 2419 if (dev->priv_flags & IFF_ISATAP) { 2420 struct in6_addr addr; 2421 2422 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2423 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2424 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2425 addrconf_add_linklocal(idev, &addr); 2426 return; 2427 } 2428 2429 sit_add_v4_addrs(idev); 2430 2431 if (dev->flags&IFF_POINTOPOINT) { 2432 addrconf_add_mroute(dev); 2433 addrconf_add_lroute(dev); 2434 } else 2435 sit_route_add(dev); 2436 } 2437 #endif 2438 2439 static inline int 2440 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2441 { 2442 struct in6_addr lladdr; 2443 2444 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2445 addrconf_add_linklocal(idev, &lladdr); 2446 return 0; 2447 } 2448 return -1; 2449 } 2450 2451 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2452 { 2453 struct net_device *link_dev; 2454 struct net *net = dev_net(idev->dev); 2455 2456 /* first try to inherit the link-local address from the link device */ 2457 if (idev->dev->iflink && 2458 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2459 if (!ipv6_inherit_linklocal(idev, link_dev)) 2460 return; 2461 } 2462 /* then try to inherit it from any device */ 2463 for_each_netdev(net, link_dev) { 2464 if (!ipv6_inherit_linklocal(idev, link_dev)) 2465 return; 2466 } 2467 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2468 } 2469 2470 /* 2471 * Autoconfigure tunnel with a link-local address so routing protocols, 2472 * DHCPv6, MLD etc. can be run over the virtual link 2473 */ 2474 2475 static void addrconf_ip6_tnl_config(struct net_device *dev) 2476 { 2477 struct inet6_dev *idev; 2478 2479 ASSERT_RTNL(); 2480 2481 idev = addrconf_add_dev(dev); 2482 if (IS_ERR(idev)) { 2483 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2484 return; 2485 } 2486 ip6_tnl_add_linklocal(idev); 2487 } 2488 2489 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2490 void * data) 2491 { 2492 struct net_device *dev = (struct net_device *) data; 2493 struct inet6_dev *idev = __in6_dev_get(dev); 2494 int run_pending = 0; 2495 int err; 2496 2497 switch (event) { 2498 case NETDEV_REGISTER: 2499 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2500 idev = ipv6_add_dev(dev); 2501 if (!idev) 2502 return notifier_from_errno(-ENOMEM); 2503 } 2504 break; 2505 2506 case NETDEV_UP: 2507 case NETDEV_CHANGE: 2508 if (dev->flags & IFF_SLAVE) 2509 break; 2510 2511 if (event == NETDEV_UP) { 2512 if (!addrconf_qdisc_ok(dev)) { 2513 /* device is not ready yet. */ 2514 printk(KERN_INFO 2515 "ADDRCONF(NETDEV_UP): %s: " 2516 "link is not ready\n", 2517 dev->name); 2518 break; 2519 } 2520 2521 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2522 idev = ipv6_add_dev(dev); 2523 2524 if (idev) { 2525 idev->if_flags |= IF_READY; 2526 run_pending = 1; 2527 } 2528 } else { 2529 if (!addrconf_qdisc_ok(dev)) { 2530 /* device is still not ready. */ 2531 break; 2532 } 2533 2534 if (idev) { 2535 if (idev->if_flags & IF_READY) 2536 /* device is already configured. */ 2537 break; 2538 idev->if_flags |= IF_READY; 2539 } 2540 2541 printk(KERN_INFO 2542 "ADDRCONF(NETDEV_CHANGE): %s: " 2543 "link becomes ready\n", 2544 dev->name); 2545 2546 run_pending = 1; 2547 } 2548 2549 switch (dev->type) { 2550 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2551 case ARPHRD_SIT: 2552 addrconf_sit_config(dev); 2553 break; 2554 #endif 2555 case ARPHRD_TUNNEL6: 2556 addrconf_ip6_tnl_config(dev); 2557 break; 2558 case ARPHRD_LOOPBACK: 2559 init_loopback(dev); 2560 break; 2561 2562 default: 2563 addrconf_dev_config(dev); 2564 break; 2565 } 2566 2567 if (idev) { 2568 if (run_pending) 2569 addrconf_dad_run(idev); 2570 2571 /* 2572 * If the MTU changed during the interface down, 2573 * when the interface up, the changed MTU must be 2574 * reflected in the idev as well as routers. 2575 */ 2576 if (idev->cnf.mtu6 != dev->mtu && 2577 dev->mtu >= IPV6_MIN_MTU) { 2578 rt6_mtu_change(dev, dev->mtu); 2579 idev->cnf.mtu6 = dev->mtu; 2580 } 2581 idev->tstamp = jiffies; 2582 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2583 2584 /* 2585 * If the changed mtu during down is lower than 2586 * IPV6_MIN_MTU stop IPv6 on this interface. 2587 */ 2588 if (dev->mtu < IPV6_MIN_MTU) 2589 addrconf_ifdown(dev, 1); 2590 } 2591 break; 2592 2593 case NETDEV_CHANGEMTU: 2594 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2595 rt6_mtu_change(dev, dev->mtu); 2596 idev->cnf.mtu6 = dev->mtu; 2597 break; 2598 } 2599 2600 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2601 idev = ipv6_add_dev(dev); 2602 if (idev) 2603 break; 2604 } 2605 2606 /* 2607 * MTU falled under IPV6_MIN_MTU. 2608 * Stop IPv6 on this interface. 2609 */ 2610 2611 case NETDEV_DOWN: 2612 case NETDEV_UNREGISTER: 2613 /* 2614 * Remove all addresses from this interface. 2615 */ 2616 addrconf_ifdown(dev, event != NETDEV_DOWN); 2617 break; 2618 2619 case NETDEV_CHANGENAME: 2620 if (idev) { 2621 snmp6_unregister_dev(idev); 2622 addrconf_sysctl_unregister(idev); 2623 addrconf_sysctl_register(idev); 2624 err = snmp6_register_dev(idev); 2625 if (err) 2626 return notifier_from_errno(err); 2627 } 2628 break; 2629 2630 case NETDEV_PRE_TYPE_CHANGE: 2631 case NETDEV_POST_TYPE_CHANGE: 2632 addrconf_type_change(dev, event); 2633 break; 2634 } 2635 2636 return NOTIFY_OK; 2637 } 2638 2639 /* 2640 * addrconf module should be notified of a device going up 2641 */ 2642 static struct notifier_block ipv6_dev_notf = { 2643 .notifier_call = addrconf_notify, 2644 }; 2645 2646 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2647 { 2648 struct inet6_dev *idev; 2649 ASSERT_RTNL(); 2650 2651 idev = __in6_dev_get(dev); 2652 2653 if (event == NETDEV_POST_TYPE_CHANGE) 2654 ipv6_mc_remap(idev); 2655 else if (event == NETDEV_PRE_TYPE_CHANGE) 2656 ipv6_mc_unmap(idev); 2657 } 2658 2659 static int addrconf_ifdown(struct net_device *dev, int how) 2660 { 2661 struct net *net = dev_net(dev); 2662 struct inet6_dev *idev; 2663 struct inet6_ifaddr *ifa; 2664 int state, i; 2665 2666 ASSERT_RTNL(); 2667 2668 rt6_ifdown(net, dev); 2669 neigh_ifdown(&nd_tbl, dev); 2670 2671 idev = __in6_dev_get(dev); 2672 if (idev == NULL) 2673 return -ENODEV; 2674 2675 /* 2676 * Step 1: remove reference to ipv6 device from parent device. 2677 * Do not dev_put! 2678 */ 2679 if (how) { 2680 idev->dead = 1; 2681 2682 /* protected by rtnl_lock */ 2683 rcu_assign_pointer(dev->ip6_ptr, NULL); 2684 2685 /* Step 1.5: remove snmp6 entry */ 2686 snmp6_unregister_dev(idev); 2687 2688 } 2689 2690 /* Step 2: clear hash table */ 2691 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2692 struct hlist_head *h = &inet6_addr_lst[i]; 2693 struct hlist_node *n; 2694 2695 spin_lock_bh(&addrconf_hash_lock); 2696 restart: 2697 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2698 if (ifa->idev == idev) { 2699 hlist_del_init_rcu(&ifa->addr_lst); 2700 addrconf_del_timer(ifa); 2701 goto restart; 2702 } 2703 } 2704 spin_unlock_bh(&addrconf_hash_lock); 2705 } 2706 2707 write_lock_bh(&idev->lock); 2708 2709 /* Step 2: clear flags for stateless addrconf */ 2710 if (!how) 2711 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2712 2713 #ifdef CONFIG_IPV6_PRIVACY 2714 if (how && del_timer(&idev->regen_timer)) 2715 in6_dev_put(idev); 2716 2717 /* Step 3: clear tempaddr list */ 2718 while (!list_empty(&idev->tempaddr_list)) { 2719 ifa = list_first_entry(&idev->tempaddr_list, 2720 struct inet6_ifaddr, tmp_list); 2721 list_del(&ifa->tmp_list); 2722 write_unlock_bh(&idev->lock); 2723 spin_lock_bh(&ifa->lock); 2724 2725 if (ifa->ifpub) { 2726 in6_ifa_put(ifa->ifpub); 2727 ifa->ifpub = NULL; 2728 } 2729 spin_unlock_bh(&ifa->lock); 2730 in6_ifa_put(ifa); 2731 write_lock_bh(&idev->lock); 2732 } 2733 #endif 2734 2735 while (!list_empty(&idev->addr_list)) { 2736 ifa = list_first_entry(&idev->addr_list, 2737 struct inet6_ifaddr, if_list); 2738 addrconf_del_timer(ifa); 2739 2740 list_del(&ifa->if_list); 2741 2742 write_unlock_bh(&idev->lock); 2743 2744 spin_lock_bh(&ifa->state_lock); 2745 state = ifa->state; 2746 ifa->state = INET6_IFADDR_STATE_DEAD; 2747 spin_unlock_bh(&ifa->state_lock); 2748 2749 if (state != INET6_IFADDR_STATE_DEAD) { 2750 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2751 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2752 } 2753 in6_ifa_put(ifa); 2754 2755 write_lock_bh(&idev->lock); 2756 } 2757 2758 write_unlock_bh(&idev->lock); 2759 2760 /* Step 5: Discard multicast list */ 2761 if (how) 2762 ipv6_mc_destroy_dev(idev); 2763 else 2764 ipv6_mc_down(idev); 2765 2766 idev->tstamp = jiffies; 2767 2768 /* Last: Shot the device (if unregistered) */ 2769 if (how) { 2770 addrconf_sysctl_unregister(idev); 2771 neigh_parms_release(&nd_tbl, idev->nd_parms); 2772 neigh_ifdown(&nd_tbl, dev); 2773 in6_dev_put(idev); 2774 } 2775 return 0; 2776 } 2777 2778 static void addrconf_rs_timer(unsigned long data) 2779 { 2780 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2781 struct inet6_dev *idev = ifp->idev; 2782 2783 read_lock(&idev->lock); 2784 if (idev->dead || !(idev->if_flags & IF_READY)) 2785 goto out; 2786 2787 if (idev->cnf.forwarding) 2788 goto out; 2789 2790 /* Announcement received after solicitation was sent */ 2791 if (idev->if_flags & IF_RA_RCVD) 2792 goto out; 2793 2794 spin_lock(&ifp->lock); 2795 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2796 /* The wait after the last probe can be shorter */ 2797 addrconf_mod_timer(ifp, AC_RS, 2798 (ifp->probes == idev->cnf.rtr_solicits) ? 2799 idev->cnf.rtr_solicit_delay : 2800 idev->cnf.rtr_solicit_interval); 2801 spin_unlock(&ifp->lock); 2802 2803 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2804 } else { 2805 spin_unlock(&ifp->lock); 2806 /* 2807 * Note: we do not support deprecated "all on-link" 2808 * assumption any longer. 2809 */ 2810 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2811 idev->dev->name); 2812 } 2813 2814 out: 2815 read_unlock(&idev->lock); 2816 in6_ifa_put(ifp); 2817 } 2818 2819 /* 2820 * Duplicate Address Detection 2821 */ 2822 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2823 { 2824 unsigned long rand_num; 2825 struct inet6_dev *idev = ifp->idev; 2826 2827 if (ifp->flags & IFA_F_OPTIMISTIC) 2828 rand_num = 0; 2829 else 2830 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2831 2832 ifp->probes = idev->cnf.dad_transmits; 2833 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2834 } 2835 2836 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2837 { 2838 struct inet6_dev *idev = ifp->idev; 2839 struct net_device *dev = idev->dev; 2840 2841 addrconf_join_solict(dev, &ifp->addr); 2842 2843 net_srandom(ifp->addr.s6_addr32[3]); 2844 2845 read_lock_bh(&idev->lock); 2846 spin_lock(&ifp->lock); 2847 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2848 goto out; 2849 2850 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2851 idev->cnf.accept_dad < 1 || 2852 !(ifp->flags&IFA_F_TENTATIVE) || 2853 ifp->flags & IFA_F_NODAD) { 2854 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2855 spin_unlock(&ifp->lock); 2856 read_unlock_bh(&idev->lock); 2857 2858 addrconf_dad_completed(ifp); 2859 return; 2860 } 2861 2862 if (!(idev->if_flags & IF_READY)) { 2863 spin_unlock(&ifp->lock); 2864 read_unlock_bh(&idev->lock); 2865 /* 2866 * If the device is not ready: 2867 * - keep it tentative if it is a permanent address. 2868 * - otherwise, kill it. 2869 */ 2870 in6_ifa_hold(ifp); 2871 addrconf_dad_stop(ifp, 0); 2872 return; 2873 } 2874 2875 /* 2876 * Optimistic nodes can start receiving 2877 * Frames right away 2878 */ 2879 if (ifp->flags & IFA_F_OPTIMISTIC) 2880 ip6_ins_rt(ifp->rt); 2881 2882 addrconf_dad_kick(ifp); 2883 out: 2884 spin_unlock(&ifp->lock); 2885 read_unlock_bh(&idev->lock); 2886 } 2887 2888 static void addrconf_dad_timer(unsigned long data) 2889 { 2890 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2891 struct inet6_dev *idev = ifp->idev; 2892 struct in6_addr mcaddr; 2893 2894 if (!ifp->probes && addrconf_dad_end(ifp)) 2895 goto out; 2896 2897 read_lock(&idev->lock); 2898 if (idev->dead || !(idev->if_flags & IF_READY)) { 2899 read_unlock(&idev->lock); 2900 goto out; 2901 } 2902 2903 spin_lock(&ifp->lock); 2904 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2905 spin_unlock(&ifp->lock); 2906 read_unlock(&idev->lock); 2907 goto out; 2908 } 2909 2910 if (ifp->probes == 0) { 2911 /* 2912 * DAD was successful 2913 */ 2914 2915 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2916 spin_unlock(&ifp->lock); 2917 read_unlock(&idev->lock); 2918 2919 addrconf_dad_completed(ifp); 2920 2921 goto out; 2922 } 2923 2924 ifp->probes--; 2925 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2926 spin_unlock(&ifp->lock); 2927 read_unlock(&idev->lock); 2928 2929 /* send a neighbour solicitation for our addr */ 2930 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2931 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 2932 out: 2933 in6_ifa_put(ifp); 2934 } 2935 2936 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2937 { 2938 struct net_device *dev = ifp->idev->dev; 2939 2940 /* 2941 * Configure the address for reception. Now it is valid. 2942 */ 2943 2944 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2945 2946 /* If added prefix is link local and forwarding is off, 2947 start sending router solicitations. 2948 */ 2949 2950 if ((ifp->idev->cnf.forwarding == 0 || 2951 ifp->idev->cnf.forwarding == 2) && 2952 ifp->idev->cnf.rtr_solicits > 0 && 2953 (dev->flags&IFF_LOOPBACK) == 0 && 2954 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2955 /* 2956 * If a host as already performed a random delay 2957 * [...] as part of DAD [...] there is no need 2958 * to delay again before sending the first RS 2959 */ 2960 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2961 2962 spin_lock_bh(&ifp->lock); 2963 ifp->probes = 1; 2964 ifp->idev->if_flags |= IF_RS_SENT; 2965 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2966 spin_unlock_bh(&ifp->lock); 2967 } 2968 } 2969 2970 static void addrconf_dad_run(struct inet6_dev *idev) 2971 { 2972 struct inet6_ifaddr *ifp; 2973 2974 read_lock_bh(&idev->lock); 2975 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2976 spin_lock(&ifp->lock); 2977 if (ifp->flags & IFA_F_TENTATIVE && 2978 ifp->state == INET6_IFADDR_STATE_DAD) 2979 addrconf_dad_kick(ifp); 2980 spin_unlock(&ifp->lock); 2981 } 2982 read_unlock_bh(&idev->lock); 2983 } 2984 2985 #ifdef CONFIG_PROC_FS 2986 struct if6_iter_state { 2987 struct seq_net_private p; 2988 int bucket; 2989 }; 2990 2991 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2992 { 2993 struct inet6_ifaddr *ifa = NULL; 2994 struct if6_iter_state *state = seq->private; 2995 struct net *net = seq_file_net(seq); 2996 2997 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2998 struct hlist_node *n; 2999 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3000 addr_lst) 3001 if (net_eq(dev_net(ifa->idev->dev), net)) 3002 return ifa; 3003 } 3004 return NULL; 3005 } 3006 3007 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3008 struct inet6_ifaddr *ifa) 3009 { 3010 struct if6_iter_state *state = seq->private; 3011 struct net *net = seq_file_net(seq); 3012 struct hlist_node *n = &ifa->addr_lst; 3013 3014 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) 3015 if (net_eq(dev_net(ifa->idev->dev), net)) 3016 return ifa; 3017 3018 while (++state->bucket < IN6_ADDR_HSIZE) { 3019 hlist_for_each_entry_rcu_bh(ifa, n, 3020 &inet6_addr_lst[state->bucket], addr_lst) { 3021 if (net_eq(dev_net(ifa->idev->dev), net)) 3022 return ifa; 3023 } 3024 } 3025 3026 return NULL; 3027 } 3028 3029 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3030 { 3031 struct inet6_ifaddr *ifa = if6_get_first(seq); 3032 3033 if (ifa) 3034 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3035 --pos; 3036 return pos ? NULL : ifa; 3037 } 3038 3039 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3040 __acquires(rcu_bh) 3041 { 3042 rcu_read_lock_bh(); 3043 return if6_get_idx(seq, *pos); 3044 } 3045 3046 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3047 { 3048 struct inet6_ifaddr *ifa; 3049 3050 ifa = if6_get_next(seq, v); 3051 ++*pos; 3052 return ifa; 3053 } 3054 3055 static void if6_seq_stop(struct seq_file *seq, void *v) 3056 __releases(rcu_bh) 3057 { 3058 rcu_read_unlock_bh(); 3059 } 3060 3061 static int if6_seq_show(struct seq_file *seq, void *v) 3062 { 3063 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3064 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3065 &ifp->addr, 3066 ifp->idev->dev->ifindex, 3067 ifp->prefix_len, 3068 ifp->scope, 3069 ifp->flags, 3070 ifp->idev->dev->name); 3071 return 0; 3072 } 3073 3074 static const struct seq_operations if6_seq_ops = { 3075 .start = if6_seq_start, 3076 .next = if6_seq_next, 3077 .show = if6_seq_show, 3078 .stop = if6_seq_stop, 3079 }; 3080 3081 static int if6_seq_open(struct inode *inode, struct file *file) 3082 { 3083 return seq_open_net(inode, file, &if6_seq_ops, 3084 sizeof(struct if6_iter_state)); 3085 } 3086 3087 static const struct file_operations if6_fops = { 3088 .owner = THIS_MODULE, 3089 .open = if6_seq_open, 3090 .read = seq_read, 3091 .llseek = seq_lseek, 3092 .release = seq_release_net, 3093 }; 3094 3095 static int __net_init if6_proc_net_init(struct net *net) 3096 { 3097 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3098 return -ENOMEM; 3099 return 0; 3100 } 3101 3102 static void __net_exit if6_proc_net_exit(struct net *net) 3103 { 3104 proc_net_remove(net, "if_inet6"); 3105 } 3106 3107 static struct pernet_operations if6_proc_net_ops = { 3108 .init = if6_proc_net_init, 3109 .exit = if6_proc_net_exit, 3110 }; 3111 3112 int __init if6_proc_init(void) 3113 { 3114 return register_pernet_subsys(&if6_proc_net_ops); 3115 } 3116 3117 void if6_proc_exit(void) 3118 { 3119 unregister_pernet_subsys(&if6_proc_net_ops); 3120 } 3121 #endif /* CONFIG_PROC_FS */ 3122 3123 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3124 /* Check if address is a home address configured on any interface. */ 3125 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 3126 { 3127 int ret = 0; 3128 struct inet6_ifaddr *ifp = NULL; 3129 struct hlist_node *n; 3130 unsigned int hash = ipv6_addr_hash(addr); 3131 3132 rcu_read_lock_bh(); 3133 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3134 if (!net_eq(dev_net(ifp->idev->dev), net)) 3135 continue; 3136 if (ipv6_addr_equal(&ifp->addr, addr) && 3137 (ifp->flags & IFA_F_HOMEADDRESS)) { 3138 ret = 1; 3139 break; 3140 } 3141 } 3142 rcu_read_unlock_bh(); 3143 return ret; 3144 } 3145 #endif 3146 3147 /* 3148 * Periodic address status verification 3149 */ 3150 3151 static void addrconf_verify(unsigned long foo) 3152 { 3153 unsigned long now, next, next_sec, next_sched; 3154 struct inet6_ifaddr *ifp; 3155 struct hlist_node *node; 3156 int i; 3157 3158 rcu_read_lock_bh(); 3159 spin_lock(&addrconf_verify_lock); 3160 now = jiffies; 3161 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3162 3163 del_timer(&addr_chk_timer); 3164 3165 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3166 restart: 3167 hlist_for_each_entry_rcu_bh(ifp, node, 3168 &inet6_addr_lst[i], addr_lst) { 3169 unsigned long age; 3170 3171 if (ifp->flags & IFA_F_PERMANENT) 3172 continue; 3173 3174 spin_lock(&ifp->lock); 3175 /* We try to batch several events at once. */ 3176 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3177 3178 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3179 age >= ifp->valid_lft) { 3180 spin_unlock(&ifp->lock); 3181 in6_ifa_hold(ifp); 3182 ipv6_del_addr(ifp); 3183 goto restart; 3184 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3185 spin_unlock(&ifp->lock); 3186 continue; 3187 } else if (age >= ifp->prefered_lft) { 3188 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3189 int deprecate = 0; 3190 3191 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3192 deprecate = 1; 3193 ifp->flags |= IFA_F_DEPRECATED; 3194 } 3195 3196 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3197 next = ifp->tstamp + ifp->valid_lft * HZ; 3198 3199 spin_unlock(&ifp->lock); 3200 3201 if (deprecate) { 3202 in6_ifa_hold(ifp); 3203 3204 ipv6_ifa_notify(0, ifp); 3205 in6_ifa_put(ifp); 3206 goto restart; 3207 } 3208 #ifdef CONFIG_IPV6_PRIVACY 3209 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3210 !(ifp->flags&IFA_F_TENTATIVE)) { 3211 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3212 ifp->idev->cnf.dad_transmits * 3213 ifp->idev->nd_parms->retrans_time / HZ; 3214 3215 if (age >= ifp->prefered_lft - regen_advance) { 3216 struct inet6_ifaddr *ifpub = ifp->ifpub; 3217 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3218 next = ifp->tstamp + ifp->prefered_lft * HZ; 3219 if (!ifp->regen_count && ifpub) { 3220 ifp->regen_count++; 3221 in6_ifa_hold(ifp); 3222 in6_ifa_hold(ifpub); 3223 spin_unlock(&ifp->lock); 3224 3225 spin_lock(&ifpub->lock); 3226 ifpub->regen_count = 0; 3227 spin_unlock(&ifpub->lock); 3228 ipv6_create_tempaddr(ifpub, ifp); 3229 in6_ifa_put(ifpub); 3230 in6_ifa_put(ifp); 3231 goto restart; 3232 } 3233 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3234 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3235 spin_unlock(&ifp->lock); 3236 #endif 3237 } else { 3238 /* ifp->prefered_lft <= ifp->valid_lft */ 3239 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3240 next = ifp->tstamp + ifp->prefered_lft * HZ; 3241 spin_unlock(&ifp->lock); 3242 } 3243 } 3244 } 3245 3246 next_sec = round_jiffies_up(next); 3247 next_sched = next; 3248 3249 /* If rounded timeout is accurate enough, accept it. */ 3250 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3251 next_sched = next_sec; 3252 3253 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3254 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3255 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3256 3257 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3258 now, next, next_sec, next_sched)); 3259 3260 addr_chk_timer.expires = next_sched; 3261 add_timer(&addr_chk_timer); 3262 spin_unlock(&addrconf_verify_lock); 3263 rcu_read_unlock_bh(); 3264 } 3265 3266 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3267 { 3268 struct in6_addr *pfx = NULL; 3269 3270 if (addr) 3271 pfx = nla_data(addr); 3272 3273 if (local) { 3274 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3275 pfx = NULL; 3276 else 3277 pfx = nla_data(local); 3278 } 3279 3280 return pfx; 3281 } 3282 3283 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3284 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3285 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3286 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3287 }; 3288 3289 static int 3290 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3291 { 3292 struct net *net = sock_net(skb->sk); 3293 struct ifaddrmsg *ifm; 3294 struct nlattr *tb[IFA_MAX+1]; 3295 struct in6_addr *pfx; 3296 int err; 3297 3298 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3299 if (err < 0) 3300 return err; 3301 3302 ifm = nlmsg_data(nlh); 3303 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3304 if (pfx == NULL) 3305 return -EINVAL; 3306 3307 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3308 } 3309 3310 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3311 u32 prefered_lft, u32 valid_lft) 3312 { 3313 u32 flags; 3314 clock_t expires; 3315 unsigned long timeout; 3316 3317 if (!valid_lft || (prefered_lft > valid_lft)) 3318 return -EINVAL; 3319 3320 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3321 if (addrconf_finite_timeout(timeout)) { 3322 expires = jiffies_to_clock_t(timeout * HZ); 3323 valid_lft = timeout; 3324 flags = RTF_EXPIRES; 3325 } else { 3326 expires = 0; 3327 flags = 0; 3328 ifa_flags |= IFA_F_PERMANENT; 3329 } 3330 3331 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3332 if (addrconf_finite_timeout(timeout)) { 3333 if (timeout == 0) 3334 ifa_flags |= IFA_F_DEPRECATED; 3335 prefered_lft = timeout; 3336 } 3337 3338 spin_lock_bh(&ifp->lock); 3339 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3340 ifp->tstamp = jiffies; 3341 ifp->valid_lft = valid_lft; 3342 ifp->prefered_lft = prefered_lft; 3343 3344 spin_unlock_bh(&ifp->lock); 3345 if (!(ifp->flags&IFA_F_TENTATIVE)) 3346 ipv6_ifa_notify(0, ifp); 3347 3348 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3349 expires, flags); 3350 addrconf_verify(0); 3351 3352 return 0; 3353 } 3354 3355 static int 3356 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3357 { 3358 struct net *net = sock_net(skb->sk); 3359 struct ifaddrmsg *ifm; 3360 struct nlattr *tb[IFA_MAX+1]; 3361 struct in6_addr *pfx; 3362 struct inet6_ifaddr *ifa; 3363 struct net_device *dev; 3364 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3365 u8 ifa_flags; 3366 int err; 3367 3368 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3369 if (err < 0) 3370 return err; 3371 3372 ifm = nlmsg_data(nlh); 3373 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3374 if (pfx == NULL) 3375 return -EINVAL; 3376 3377 if (tb[IFA_CACHEINFO]) { 3378 struct ifa_cacheinfo *ci; 3379 3380 ci = nla_data(tb[IFA_CACHEINFO]); 3381 valid_lft = ci->ifa_valid; 3382 preferred_lft = ci->ifa_prefered; 3383 } else { 3384 preferred_lft = INFINITY_LIFE_TIME; 3385 valid_lft = INFINITY_LIFE_TIME; 3386 } 3387 3388 dev = __dev_get_by_index(net, ifm->ifa_index); 3389 if (dev == NULL) 3390 return -ENODEV; 3391 3392 /* We ignore other flags so far. */ 3393 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3394 3395 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3396 if (ifa == NULL) { 3397 /* 3398 * It would be best to check for !NLM_F_CREATE here but 3399 * userspace alreay relies on not having to provide this. 3400 */ 3401 return inet6_addr_add(net, ifm->ifa_index, pfx, 3402 ifm->ifa_prefixlen, ifa_flags, 3403 preferred_lft, valid_lft); 3404 } 3405 3406 if (nlh->nlmsg_flags & NLM_F_EXCL || 3407 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3408 err = -EEXIST; 3409 else 3410 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3411 3412 in6_ifa_put(ifa); 3413 3414 return err; 3415 } 3416 3417 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3418 u8 scope, int ifindex) 3419 { 3420 struct ifaddrmsg *ifm; 3421 3422 ifm = nlmsg_data(nlh); 3423 ifm->ifa_family = AF_INET6; 3424 ifm->ifa_prefixlen = prefixlen; 3425 ifm->ifa_flags = flags; 3426 ifm->ifa_scope = scope; 3427 ifm->ifa_index = ifindex; 3428 } 3429 3430 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3431 unsigned long tstamp, u32 preferred, u32 valid) 3432 { 3433 struct ifa_cacheinfo ci; 3434 3435 ci.cstamp = cstamp_delta(cstamp); 3436 ci.tstamp = cstamp_delta(tstamp); 3437 ci.ifa_prefered = preferred; 3438 ci.ifa_valid = valid; 3439 3440 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3441 } 3442 3443 static inline int rt_scope(int ifa_scope) 3444 { 3445 if (ifa_scope & IFA_HOST) 3446 return RT_SCOPE_HOST; 3447 else if (ifa_scope & IFA_LINK) 3448 return RT_SCOPE_LINK; 3449 else if (ifa_scope & IFA_SITE) 3450 return RT_SCOPE_SITE; 3451 else 3452 return RT_SCOPE_UNIVERSE; 3453 } 3454 3455 static inline int inet6_ifaddr_msgsize(void) 3456 { 3457 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3458 + nla_total_size(16) /* IFA_ADDRESS */ 3459 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3460 } 3461 3462 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3463 u32 pid, u32 seq, int event, unsigned int flags) 3464 { 3465 struct nlmsghdr *nlh; 3466 u32 preferred, valid; 3467 3468 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3469 if (nlh == NULL) 3470 return -EMSGSIZE; 3471 3472 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3473 ifa->idev->dev->ifindex); 3474 3475 if (!(ifa->flags&IFA_F_PERMANENT)) { 3476 preferred = ifa->prefered_lft; 3477 valid = ifa->valid_lft; 3478 if (preferred != INFINITY_LIFE_TIME) { 3479 long tval = (jiffies - ifa->tstamp)/HZ; 3480 if (preferred > tval) 3481 preferred -= tval; 3482 else 3483 preferred = 0; 3484 if (valid != INFINITY_LIFE_TIME) { 3485 if (valid > tval) 3486 valid -= tval; 3487 else 3488 valid = 0; 3489 } 3490 } 3491 } else { 3492 preferred = INFINITY_LIFE_TIME; 3493 valid = INFINITY_LIFE_TIME; 3494 } 3495 3496 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3497 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3498 nlmsg_cancel(skb, nlh); 3499 return -EMSGSIZE; 3500 } 3501 3502 return nlmsg_end(skb, nlh); 3503 } 3504 3505 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3506 u32 pid, u32 seq, int event, u16 flags) 3507 { 3508 struct nlmsghdr *nlh; 3509 u8 scope = RT_SCOPE_UNIVERSE; 3510 int ifindex = ifmca->idev->dev->ifindex; 3511 3512 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3513 scope = RT_SCOPE_SITE; 3514 3515 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3516 if (nlh == NULL) 3517 return -EMSGSIZE; 3518 3519 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3520 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3521 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3522 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3523 nlmsg_cancel(skb, nlh); 3524 return -EMSGSIZE; 3525 } 3526 3527 return nlmsg_end(skb, nlh); 3528 } 3529 3530 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3531 u32 pid, u32 seq, int event, unsigned int flags) 3532 { 3533 struct nlmsghdr *nlh; 3534 u8 scope = RT_SCOPE_UNIVERSE; 3535 int ifindex = ifaca->aca_idev->dev->ifindex; 3536 3537 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3538 scope = RT_SCOPE_SITE; 3539 3540 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3541 if (nlh == NULL) 3542 return -EMSGSIZE; 3543 3544 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3545 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3546 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3547 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3548 nlmsg_cancel(skb, nlh); 3549 return -EMSGSIZE; 3550 } 3551 3552 return nlmsg_end(skb, nlh); 3553 } 3554 3555 enum addr_type_t { 3556 UNICAST_ADDR, 3557 MULTICAST_ADDR, 3558 ANYCAST_ADDR, 3559 }; 3560 3561 /* called with rcu_read_lock() */ 3562 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3563 struct netlink_callback *cb, enum addr_type_t type, 3564 int s_ip_idx, int *p_ip_idx) 3565 { 3566 struct ifmcaddr6 *ifmca; 3567 struct ifacaddr6 *ifaca; 3568 int err = 1; 3569 int ip_idx = *p_ip_idx; 3570 3571 read_lock_bh(&idev->lock); 3572 switch (type) { 3573 case UNICAST_ADDR: { 3574 struct inet6_ifaddr *ifa; 3575 3576 /* unicast address incl. temp addr */ 3577 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3578 if (++ip_idx < s_ip_idx) 3579 continue; 3580 err = inet6_fill_ifaddr(skb, ifa, 3581 NETLINK_CB(cb->skb).pid, 3582 cb->nlh->nlmsg_seq, 3583 RTM_NEWADDR, 3584 NLM_F_MULTI); 3585 if (err <= 0) 3586 break; 3587 } 3588 break; 3589 } 3590 case MULTICAST_ADDR: 3591 /* multicast address */ 3592 for (ifmca = idev->mc_list; ifmca; 3593 ifmca = ifmca->next, ip_idx++) { 3594 if (ip_idx < s_ip_idx) 3595 continue; 3596 err = inet6_fill_ifmcaddr(skb, ifmca, 3597 NETLINK_CB(cb->skb).pid, 3598 cb->nlh->nlmsg_seq, 3599 RTM_GETMULTICAST, 3600 NLM_F_MULTI); 3601 if (err <= 0) 3602 break; 3603 } 3604 break; 3605 case ANYCAST_ADDR: 3606 /* anycast address */ 3607 for (ifaca = idev->ac_list; ifaca; 3608 ifaca = ifaca->aca_next, ip_idx++) { 3609 if (ip_idx < s_ip_idx) 3610 continue; 3611 err = inet6_fill_ifacaddr(skb, ifaca, 3612 NETLINK_CB(cb->skb).pid, 3613 cb->nlh->nlmsg_seq, 3614 RTM_GETANYCAST, 3615 NLM_F_MULTI); 3616 if (err <= 0) 3617 break; 3618 } 3619 break; 3620 default: 3621 break; 3622 } 3623 read_unlock_bh(&idev->lock); 3624 *p_ip_idx = ip_idx; 3625 return err; 3626 } 3627 3628 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3629 enum addr_type_t type) 3630 { 3631 struct net *net = sock_net(skb->sk); 3632 int h, s_h; 3633 int idx, ip_idx; 3634 int s_idx, s_ip_idx; 3635 struct net_device *dev; 3636 struct inet6_dev *idev; 3637 struct hlist_head *head; 3638 struct hlist_node *node; 3639 3640 s_h = cb->args[0]; 3641 s_idx = idx = cb->args[1]; 3642 s_ip_idx = ip_idx = cb->args[2]; 3643 3644 rcu_read_lock(); 3645 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3646 idx = 0; 3647 head = &net->dev_index_head[h]; 3648 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3649 if (idx < s_idx) 3650 goto cont; 3651 if (h > s_h || idx > s_idx) 3652 s_ip_idx = 0; 3653 ip_idx = 0; 3654 idev = __in6_dev_get(dev); 3655 if (!idev) 3656 goto cont; 3657 3658 if (in6_dump_addrs(idev, skb, cb, type, 3659 s_ip_idx, &ip_idx) <= 0) 3660 goto done; 3661 cont: 3662 idx++; 3663 } 3664 } 3665 done: 3666 rcu_read_unlock(); 3667 cb->args[0] = h; 3668 cb->args[1] = idx; 3669 cb->args[2] = ip_idx; 3670 3671 return skb->len; 3672 } 3673 3674 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3675 { 3676 enum addr_type_t type = UNICAST_ADDR; 3677 3678 return inet6_dump_addr(skb, cb, type); 3679 } 3680 3681 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3682 { 3683 enum addr_type_t type = MULTICAST_ADDR; 3684 3685 return inet6_dump_addr(skb, cb, type); 3686 } 3687 3688 3689 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3690 { 3691 enum addr_type_t type = ANYCAST_ADDR; 3692 3693 return inet6_dump_addr(skb, cb, type); 3694 } 3695 3696 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3697 void *arg) 3698 { 3699 struct net *net = sock_net(in_skb->sk); 3700 struct ifaddrmsg *ifm; 3701 struct nlattr *tb[IFA_MAX+1]; 3702 struct in6_addr *addr = NULL; 3703 struct net_device *dev = NULL; 3704 struct inet6_ifaddr *ifa; 3705 struct sk_buff *skb; 3706 int err; 3707 3708 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3709 if (err < 0) 3710 goto errout; 3711 3712 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3713 if (addr == NULL) { 3714 err = -EINVAL; 3715 goto errout; 3716 } 3717 3718 ifm = nlmsg_data(nlh); 3719 if (ifm->ifa_index) 3720 dev = __dev_get_by_index(net, ifm->ifa_index); 3721 3722 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3723 if (!ifa) { 3724 err = -EADDRNOTAVAIL; 3725 goto errout; 3726 } 3727 3728 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3729 if (!skb) { 3730 err = -ENOBUFS; 3731 goto errout_ifa; 3732 } 3733 3734 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3735 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3736 if (err < 0) { 3737 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3738 WARN_ON(err == -EMSGSIZE); 3739 kfree_skb(skb); 3740 goto errout_ifa; 3741 } 3742 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3743 errout_ifa: 3744 in6_ifa_put(ifa); 3745 errout: 3746 return err; 3747 } 3748 3749 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3750 { 3751 struct sk_buff *skb; 3752 struct net *net = dev_net(ifa->idev->dev); 3753 int err = -ENOBUFS; 3754 3755 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3756 if (skb == NULL) 3757 goto errout; 3758 3759 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3760 if (err < 0) { 3761 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3762 WARN_ON(err == -EMSGSIZE); 3763 kfree_skb(skb); 3764 goto errout; 3765 } 3766 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3767 return; 3768 errout: 3769 if (err < 0) 3770 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3771 } 3772 3773 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3774 __s32 *array, int bytes) 3775 { 3776 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3777 3778 memset(array, 0, bytes); 3779 array[DEVCONF_FORWARDING] = cnf->forwarding; 3780 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3781 array[DEVCONF_MTU6] = cnf->mtu6; 3782 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3783 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3784 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3785 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3786 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3787 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3788 jiffies_to_msecs(cnf->rtr_solicit_interval); 3789 array[DEVCONF_RTR_SOLICIT_DELAY] = 3790 jiffies_to_msecs(cnf->rtr_solicit_delay); 3791 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3792 #ifdef CONFIG_IPV6_PRIVACY 3793 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3794 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3795 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3796 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3797 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3798 #endif 3799 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3800 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3801 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3802 #ifdef CONFIG_IPV6_ROUTER_PREF 3803 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3804 array[DEVCONF_RTR_PROBE_INTERVAL] = 3805 jiffies_to_msecs(cnf->rtr_probe_interval); 3806 #ifdef CONFIG_IPV6_ROUTE_INFO 3807 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3808 #endif 3809 #endif 3810 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3811 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3812 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3813 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3814 #endif 3815 #ifdef CONFIG_IPV6_MROUTE 3816 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3817 #endif 3818 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3819 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3820 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3821 } 3822 3823 static inline size_t inet6_ifla6_size(void) 3824 { 3825 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3826 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3827 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3828 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3829 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3830 } 3831 3832 static inline size_t inet6_if_nlmsg_size(void) 3833 { 3834 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3835 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3836 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3837 + nla_total_size(4) /* IFLA_MTU */ 3838 + nla_total_size(4) /* IFLA_LINK */ 3839 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3840 } 3841 3842 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib, 3843 int items, int bytes) 3844 { 3845 int i; 3846 int pad = bytes - sizeof(u64) * items; 3847 BUG_ON(pad < 0); 3848 3849 /* Use put_unaligned() because stats may not be aligned for u64. */ 3850 put_unaligned(items, &stats[0]); 3851 for (i = 1; i < items; i++) 3852 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3853 3854 memset(&stats[items], 0, pad); 3855 } 3856 3857 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3858 int items, int bytes, size_t syncpoff) 3859 { 3860 int i; 3861 int pad = bytes - sizeof(u64) * items; 3862 BUG_ON(pad < 0); 3863 3864 /* Use put_unaligned() because stats may not be aligned for u64. */ 3865 put_unaligned(items, &stats[0]); 3866 for (i = 1; i < items; i++) 3867 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3868 3869 memset(&stats[items], 0, pad); 3870 } 3871 3872 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3873 int bytes) 3874 { 3875 switch (attrtype) { 3876 case IFLA_INET6_STATS: 3877 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3878 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3879 break; 3880 case IFLA_INET6_ICMP6STATS: 3881 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3882 break; 3883 } 3884 } 3885 3886 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3887 { 3888 struct nlattr *nla; 3889 struct ifla_cacheinfo ci; 3890 3891 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3892 3893 ci.max_reasm_len = IPV6_MAXPLEN; 3894 ci.tstamp = cstamp_delta(idev->tstamp); 3895 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3896 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3897 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3898 3899 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3900 if (nla == NULL) 3901 goto nla_put_failure; 3902 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3903 3904 /* XXX - MC not implemented */ 3905 3906 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3907 if (nla == NULL) 3908 goto nla_put_failure; 3909 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3910 3911 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3912 if (nla == NULL) 3913 goto nla_put_failure; 3914 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3915 3916 return 0; 3917 3918 nla_put_failure: 3919 return -EMSGSIZE; 3920 } 3921 3922 static size_t inet6_get_link_af_size(const struct net_device *dev) 3923 { 3924 if (!__in6_dev_get(dev)) 3925 return 0; 3926 3927 return inet6_ifla6_size(); 3928 } 3929 3930 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 3931 { 3932 struct inet6_dev *idev = __in6_dev_get(dev); 3933 3934 if (!idev) 3935 return -ENODATA; 3936 3937 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 3938 return -EMSGSIZE; 3939 3940 return 0; 3941 } 3942 3943 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3944 u32 pid, u32 seq, int event, unsigned int flags) 3945 { 3946 struct net_device *dev = idev->dev; 3947 struct ifinfomsg *hdr; 3948 struct nlmsghdr *nlh; 3949 void *protoinfo; 3950 3951 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3952 if (nlh == NULL) 3953 return -EMSGSIZE; 3954 3955 hdr = nlmsg_data(nlh); 3956 hdr->ifi_family = AF_INET6; 3957 hdr->__ifi_pad = 0; 3958 hdr->ifi_type = dev->type; 3959 hdr->ifi_index = dev->ifindex; 3960 hdr->ifi_flags = dev_get_flags(dev); 3961 hdr->ifi_change = 0; 3962 3963 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3964 3965 if (dev->addr_len) 3966 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3967 3968 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3969 if (dev->ifindex != dev->iflink) 3970 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3971 3972 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3973 if (protoinfo == NULL) 3974 goto nla_put_failure; 3975 3976 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 3977 goto nla_put_failure; 3978 3979 nla_nest_end(skb, protoinfo); 3980 return nlmsg_end(skb, nlh); 3981 3982 nla_put_failure: 3983 nlmsg_cancel(skb, nlh); 3984 return -EMSGSIZE; 3985 } 3986 3987 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3988 { 3989 struct net *net = sock_net(skb->sk); 3990 int h, s_h; 3991 int idx = 0, s_idx; 3992 struct net_device *dev; 3993 struct inet6_dev *idev; 3994 struct hlist_head *head; 3995 struct hlist_node *node; 3996 3997 s_h = cb->args[0]; 3998 s_idx = cb->args[1]; 3999 4000 rcu_read_lock(); 4001 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4002 idx = 0; 4003 head = &net->dev_index_head[h]; 4004 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4005 if (idx < s_idx) 4006 goto cont; 4007 idev = __in6_dev_get(dev); 4008 if (!idev) 4009 goto cont; 4010 if (inet6_fill_ifinfo(skb, idev, 4011 NETLINK_CB(cb->skb).pid, 4012 cb->nlh->nlmsg_seq, 4013 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4014 goto out; 4015 cont: 4016 idx++; 4017 } 4018 } 4019 out: 4020 rcu_read_unlock(); 4021 cb->args[1] = idx; 4022 cb->args[0] = h; 4023 4024 return skb->len; 4025 } 4026 4027 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4028 { 4029 struct sk_buff *skb; 4030 struct net *net = dev_net(idev->dev); 4031 int err = -ENOBUFS; 4032 4033 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4034 if (skb == NULL) 4035 goto errout; 4036 4037 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4038 if (err < 0) { 4039 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4040 WARN_ON(err == -EMSGSIZE); 4041 kfree_skb(skb); 4042 goto errout; 4043 } 4044 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4045 return; 4046 errout: 4047 if (err < 0) 4048 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4049 } 4050 4051 static inline size_t inet6_prefix_nlmsg_size(void) 4052 { 4053 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4054 + nla_total_size(sizeof(struct in6_addr)) 4055 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4056 } 4057 4058 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4059 struct prefix_info *pinfo, u32 pid, u32 seq, 4060 int event, unsigned int flags) 4061 { 4062 struct prefixmsg *pmsg; 4063 struct nlmsghdr *nlh; 4064 struct prefix_cacheinfo ci; 4065 4066 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4067 if (nlh == NULL) 4068 return -EMSGSIZE; 4069 4070 pmsg = nlmsg_data(nlh); 4071 pmsg->prefix_family = AF_INET6; 4072 pmsg->prefix_pad1 = 0; 4073 pmsg->prefix_pad2 = 0; 4074 pmsg->prefix_ifindex = idev->dev->ifindex; 4075 pmsg->prefix_len = pinfo->prefix_len; 4076 pmsg->prefix_type = pinfo->type; 4077 pmsg->prefix_pad3 = 0; 4078 pmsg->prefix_flags = 0; 4079 if (pinfo->onlink) 4080 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4081 if (pinfo->autoconf) 4082 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4083 4084 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4085 4086 ci.preferred_time = ntohl(pinfo->prefered); 4087 ci.valid_time = ntohl(pinfo->valid); 4088 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4089 4090 return nlmsg_end(skb, nlh); 4091 4092 nla_put_failure: 4093 nlmsg_cancel(skb, nlh); 4094 return -EMSGSIZE; 4095 } 4096 4097 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4098 struct prefix_info *pinfo) 4099 { 4100 struct sk_buff *skb; 4101 struct net *net = dev_net(idev->dev); 4102 int err = -ENOBUFS; 4103 4104 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4105 if (skb == NULL) 4106 goto errout; 4107 4108 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4109 if (err < 0) { 4110 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4111 WARN_ON(err == -EMSGSIZE); 4112 kfree_skb(skb); 4113 goto errout; 4114 } 4115 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4116 return; 4117 errout: 4118 if (err < 0) 4119 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4120 } 4121 4122 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4123 { 4124 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4125 4126 switch (event) { 4127 case RTM_NEWADDR: 4128 /* 4129 * If the address was optimistic 4130 * we inserted the route at the start of 4131 * our DAD process, so we don't need 4132 * to do it again 4133 */ 4134 if (!(ifp->rt->rt6i_node)) 4135 ip6_ins_rt(ifp->rt); 4136 if (ifp->idev->cnf.forwarding) 4137 addrconf_join_anycast(ifp); 4138 break; 4139 case RTM_DELADDR: 4140 if (ifp->idev->cnf.forwarding) 4141 addrconf_leave_anycast(ifp); 4142 addrconf_leave_solict(ifp->idev, &ifp->addr); 4143 dst_hold(&ifp->rt->dst); 4144 4145 if (ip6_del_rt(ifp->rt)) 4146 dst_free(&ifp->rt->dst); 4147 break; 4148 } 4149 } 4150 4151 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4152 { 4153 rcu_read_lock_bh(); 4154 if (likely(ifp->idev->dead == 0)) 4155 __ipv6_ifa_notify(event, ifp); 4156 rcu_read_unlock_bh(); 4157 } 4158 4159 #ifdef CONFIG_SYSCTL 4160 4161 static 4162 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4163 void __user *buffer, size_t *lenp, loff_t *ppos) 4164 { 4165 int *valp = ctl->data; 4166 int val = *valp; 4167 loff_t pos = *ppos; 4168 int ret; 4169 4170 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4171 4172 if (write) 4173 ret = addrconf_fixup_forwarding(ctl, valp, val); 4174 if (ret) 4175 *ppos = pos; 4176 return ret; 4177 } 4178 4179 static void dev_disable_change(struct inet6_dev *idev) 4180 { 4181 if (!idev || !idev->dev) 4182 return; 4183 4184 if (idev->cnf.disable_ipv6) 4185 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4186 else 4187 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4188 } 4189 4190 static void addrconf_disable_change(struct net *net, __s32 newf) 4191 { 4192 struct net_device *dev; 4193 struct inet6_dev *idev; 4194 4195 rcu_read_lock(); 4196 for_each_netdev_rcu(net, dev) { 4197 idev = __in6_dev_get(dev); 4198 if (idev) { 4199 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4200 idev->cnf.disable_ipv6 = newf; 4201 if (changed) 4202 dev_disable_change(idev); 4203 } 4204 } 4205 rcu_read_unlock(); 4206 } 4207 4208 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4209 { 4210 struct net *net; 4211 4212 net = (struct net *)table->extra2; 4213 4214 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4215 return 0; 4216 4217 if (!rtnl_trylock()) { 4218 /* Restore the original values before restarting */ 4219 *p = old; 4220 return restart_syscall(); 4221 } 4222 4223 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4224 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4225 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4226 addrconf_disable_change(net, newf); 4227 } else if ((!*p) ^ (!old)) 4228 dev_disable_change((struct inet6_dev *)table->extra1); 4229 4230 rtnl_unlock(); 4231 return 0; 4232 } 4233 4234 static 4235 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4236 void __user *buffer, size_t *lenp, loff_t *ppos) 4237 { 4238 int *valp = ctl->data; 4239 int val = *valp; 4240 loff_t pos = *ppos; 4241 int ret; 4242 4243 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4244 4245 if (write) 4246 ret = addrconf_disable_ipv6(ctl, valp, val); 4247 if (ret) 4248 *ppos = pos; 4249 return ret; 4250 } 4251 4252 static struct addrconf_sysctl_table 4253 { 4254 struct ctl_table_header *sysctl_header; 4255 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4256 char *dev_name; 4257 } addrconf_sysctl __read_mostly = { 4258 .sysctl_header = NULL, 4259 .addrconf_vars = { 4260 { 4261 .procname = "forwarding", 4262 .data = &ipv6_devconf.forwarding, 4263 .maxlen = sizeof(int), 4264 .mode = 0644, 4265 .proc_handler = addrconf_sysctl_forward, 4266 }, 4267 { 4268 .procname = "hop_limit", 4269 .data = &ipv6_devconf.hop_limit, 4270 .maxlen = sizeof(int), 4271 .mode = 0644, 4272 .proc_handler = proc_dointvec, 4273 }, 4274 { 4275 .procname = "mtu", 4276 .data = &ipv6_devconf.mtu6, 4277 .maxlen = sizeof(int), 4278 .mode = 0644, 4279 .proc_handler = proc_dointvec, 4280 }, 4281 { 4282 .procname = "accept_ra", 4283 .data = &ipv6_devconf.accept_ra, 4284 .maxlen = sizeof(int), 4285 .mode = 0644, 4286 .proc_handler = proc_dointvec, 4287 }, 4288 { 4289 .procname = "accept_redirects", 4290 .data = &ipv6_devconf.accept_redirects, 4291 .maxlen = sizeof(int), 4292 .mode = 0644, 4293 .proc_handler = proc_dointvec, 4294 }, 4295 { 4296 .procname = "autoconf", 4297 .data = &ipv6_devconf.autoconf, 4298 .maxlen = sizeof(int), 4299 .mode = 0644, 4300 .proc_handler = proc_dointvec, 4301 }, 4302 { 4303 .procname = "dad_transmits", 4304 .data = &ipv6_devconf.dad_transmits, 4305 .maxlen = sizeof(int), 4306 .mode = 0644, 4307 .proc_handler = proc_dointvec, 4308 }, 4309 { 4310 .procname = "router_solicitations", 4311 .data = &ipv6_devconf.rtr_solicits, 4312 .maxlen = sizeof(int), 4313 .mode = 0644, 4314 .proc_handler = proc_dointvec, 4315 }, 4316 { 4317 .procname = "router_solicitation_interval", 4318 .data = &ipv6_devconf.rtr_solicit_interval, 4319 .maxlen = sizeof(int), 4320 .mode = 0644, 4321 .proc_handler = proc_dointvec_jiffies, 4322 }, 4323 { 4324 .procname = "router_solicitation_delay", 4325 .data = &ipv6_devconf.rtr_solicit_delay, 4326 .maxlen = sizeof(int), 4327 .mode = 0644, 4328 .proc_handler = proc_dointvec_jiffies, 4329 }, 4330 { 4331 .procname = "force_mld_version", 4332 .data = &ipv6_devconf.force_mld_version, 4333 .maxlen = sizeof(int), 4334 .mode = 0644, 4335 .proc_handler = proc_dointvec, 4336 }, 4337 #ifdef CONFIG_IPV6_PRIVACY 4338 { 4339 .procname = "use_tempaddr", 4340 .data = &ipv6_devconf.use_tempaddr, 4341 .maxlen = sizeof(int), 4342 .mode = 0644, 4343 .proc_handler = proc_dointvec, 4344 }, 4345 { 4346 .procname = "temp_valid_lft", 4347 .data = &ipv6_devconf.temp_valid_lft, 4348 .maxlen = sizeof(int), 4349 .mode = 0644, 4350 .proc_handler = proc_dointvec, 4351 }, 4352 { 4353 .procname = "temp_prefered_lft", 4354 .data = &ipv6_devconf.temp_prefered_lft, 4355 .maxlen = sizeof(int), 4356 .mode = 0644, 4357 .proc_handler = proc_dointvec, 4358 }, 4359 { 4360 .procname = "regen_max_retry", 4361 .data = &ipv6_devconf.regen_max_retry, 4362 .maxlen = sizeof(int), 4363 .mode = 0644, 4364 .proc_handler = proc_dointvec, 4365 }, 4366 { 4367 .procname = "max_desync_factor", 4368 .data = &ipv6_devconf.max_desync_factor, 4369 .maxlen = sizeof(int), 4370 .mode = 0644, 4371 .proc_handler = proc_dointvec, 4372 }, 4373 #endif 4374 { 4375 .procname = "max_addresses", 4376 .data = &ipv6_devconf.max_addresses, 4377 .maxlen = sizeof(int), 4378 .mode = 0644, 4379 .proc_handler = proc_dointvec, 4380 }, 4381 { 4382 .procname = "accept_ra_defrtr", 4383 .data = &ipv6_devconf.accept_ra_defrtr, 4384 .maxlen = sizeof(int), 4385 .mode = 0644, 4386 .proc_handler = proc_dointvec, 4387 }, 4388 { 4389 .procname = "accept_ra_pinfo", 4390 .data = &ipv6_devconf.accept_ra_pinfo, 4391 .maxlen = sizeof(int), 4392 .mode = 0644, 4393 .proc_handler = proc_dointvec, 4394 }, 4395 #ifdef CONFIG_IPV6_ROUTER_PREF 4396 { 4397 .procname = "accept_ra_rtr_pref", 4398 .data = &ipv6_devconf.accept_ra_rtr_pref, 4399 .maxlen = sizeof(int), 4400 .mode = 0644, 4401 .proc_handler = proc_dointvec, 4402 }, 4403 { 4404 .procname = "router_probe_interval", 4405 .data = &ipv6_devconf.rtr_probe_interval, 4406 .maxlen = sizeof(int), 4407 .mode = 0644, 4408 .proc_handler = proc_dointvec_jiffies, 4409 }, 4410 #ifdef CONFIG_IPV6_ROUTE_INFO 4411 { 4412 .procname = "accept_ra_rt_info_max_plen", 4413 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4414 .maxlen = sizeof(int), 4415 .mode = 0644, 4416 .proc_handler = proc_dointvec, 4417 }, 4418 #endif 4419 #endif 4420 { 4421 .procname = "proxy_ndp", 4422 .data = &ipv6_devconf.proxy_ndp, 4423 .maxlen = sizeof(int), 4424 .mode = 0644, 4425 .proc_handler = proc_dointvec, 4426 }, 4427 { 4428 .procname = "accept_source_route", 4429 .data = &ipv6_devconf.accept_source_route, 4430 .maxlen = sizeof(int), 4431 .mode = 0644, 4432 .proc_handler = proc_dointvec, 4433 }, 4434 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4435 { 4436 .procname = "optimistic_dad", 4437 .data = &ipv6_devconf.optimistic_dad, 4438 .maxlen = sizeof(int), 4439 .mode = 0644, 4440 .proc_handler = proc_dointvec, 4441 4442 }, 4443 #endif 4444 #ifdef CONFIG_IPV6_MROUTE 4445 { 4446 .procname = "mc_forwarding", 4447 .data = &ipv6_devconf.mc_forwarding, 4448 .maxlen = sizeof(int), 4449 .mode = 0444, 4450 .proc_handler = proc_dointvec, 4451 }, 4452 #endif 4453 { 4454 .procname = "disable_ipv6", 4455 .data = &ipv6_devconf.disable_ipv6, 4456 .maxlen = sizeof(int), 4457 .mode = 0644, 4458 .proc_handler = addrconf_sysctl_disable, 4459 }, 4460 { 4461 .procname = "accept_dad", 4462 .data = &ipv6_devconf.accept_dad, 4463 .maxlen = sizeof(int), 4464 .mode = 0644, 4465 .proc_handler = proc_dointvec, 4466 }, 4467 { 4468 .procname = "force_tllao", 4469 .data = &ipv6_devconf.force_tllao, 4470 .maxlen = sizeof(int), 4471 .mode = 0644, 4472 .proc_handler = proc_dointvec 4473 }, 4474 { 4475 /* sentinel */ 4476 } 4477 }, 4478 }; 4479 4480 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4481 struct inet6_dev *idev, struct ipv6_devconf *p) 4482 { 4483 int i; 4484 struct addrconf_sysctl_table *t; 4485 4486 #define ADDRCONF_CTL_PATH_DEV 3 4487 4488 struct ctl_path addrconf_ctl_path[] = { 4489 { .procname = "net", }, 4490 { .procname = "ipv6", }, 4491 { .procname = "conf", }, 4492 { /* to be set */ }, 4493 { }, 4494 }; 4495 4496 4497 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4498 if (t == NULL) 4499 goto out; 4500 4501 for (i = 0; t->addrconf_vars[i].data; i++) { 4502 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4503 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4504 t->addrconf_vars[i].extra2 = net; 4505 } 4506 4507 /* 4508 * Make a copy of dev_name, because '.procname' is regarded as const 4509 * by sysctl and we wouldn't want anyone to change it under our feet 4510 * (see SIOCSIFNAME). 4511 */ 4512 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4513 if (!t->dev_name) 4514 goto free; 4515 4516 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4517 4518 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4519 t->addrconf_vars); 4520 if (t->sysctl_header == NULL) 4521 goto free_procname; 4522 4523 p->sysctl = t; 4524 return 0; 4525 4526 free_procname: 4527 kfree(t->dev_name); 4528 free: 4529 kfree(t); 4530 out: 4531 return -ENOBUFS; 4532 } 4533 4534 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4535 { 4536 struct addrconf_sysctl_table *t; 4537 4538 if (p->sysctl == NULL) 4539 return; 4540 4541 t = p->sysctl; 4542 p->sysctl = NULL; 4543 unregister_sysctl_table(t->sysctl_header); 4544 kfree(t->dev_name); 4545 kfree(t); 4546 } 4547 4548 static void addrconf_sysctl_register(struct inet6_dev *idev) 4549 { 4550 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4551 &ndisc_ifinfo_sysctl_change); 4552 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4553 idev, &idev->cnf); 4554 } 4555 4556 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4557 { 4558 __addrconf_sysctl_unregister(&idev->cnf); 4559 neigh_sysctl_unregister(idev->nd_parms); 4560 } 4561 4562 4563 #endif 4564 4565 static int __net_init addrconf_init_net(struct net *net) 4566 { 4567 int err; 4568 struct ipv6_devconf *all, *dflt; 4569 4570 err = -ENOMEM; 4571 all = &ipv6_devconf; 4572 dflt = &ipv6_devconf_dflt; 4573 4574 if (!net_eq(net, &init_net)) { 4575 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4576 if (all == NULL) 4577 goto err_alloc_all; 4578 4579 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4580 if (dflt == NULL) 4581 goto err_alloc_dflt; 4582 } else { 4583 /* these will be inherited by all namespaces */ 4584 dflt->autoconf = ipv6_defaults.autoconf; 4585 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4586 } 4587 4588 net->ipv6.devconf_all = all; 4589 net->ipv6.devconf_dflt = dflt; 4590 4591 #ifdef CONFIG_SYSCTL 4592 err = __addrconf_sysctl_register(net, "all", NULL, all); 4593 if (err < 0) 4594 goto err_reg_all; 4595 4596 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4597 if (err < 0) 4598 goto err_reg_dflt; 4599 #endif 4600 return 0; 4601 4602 #ifdef CONFIG_SYSCTL 4603 err_reg_dflt: 4604 __addrconf_sysctl_unregister(all); 4605 err_reg_all: 4606 kfree(dflt); 4607 #endif 4608 err_alloc_dflt: 4609 kfree(all); 4610 err_alloc_all: 4611 return err; 4612 } 4613 4614 static void __net_exit addrconf_exit_net(struct net *net) 4615 { 4616 #ifdef CONFIG_SYSCTL 4617 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4618 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4619 #endif 4620 if (!net_eq(net, &init_net)) { 4621 kfree(net->ipv6.devconf_dflt); 4622 kfree(net->ipv6.devconf_all); 4623 } 4624 } 4625 4626 static struct pernet_operations addrconf_ops = { 4627 .init = addrconf_init_net, 4628 .exit = addrconf_exit_net, 4629 }; 4630 4631 /* 4632 * Device notifier 4633 */ 4634 4635 int register_inet6addr_notifier(struct notifier_block *nb) 4636 { 4637 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4638 } 4639 EXPORT_SYMBOL(register_inet6addr_notifier); 4640 4641 int unregister_inet6addr_notifier(struct notifier_block *nb) 4642 { 4643 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4644 } 4645 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4646 4647 static struct rtnl_af_ops inet6_ops = { 4648 .family = AF_INET6, 4649 .fill_link_af = inet6_fill_link_af, 4650 .get_link_af_size = inet6_get_link_af_size, 4651 }; 4652 4653 /* 4654 * Init / cleanup code 4655 */ 4656 4657 int __init addrconf_init(void) 4658 { 4659 int i, err; 4660 4661 err = ipv6_addr_label_init(); 4662 if (err < 0) { 4663 printk(KERN_CRIT "IPv6 Addrconf:" 4664 " cannot initialize default policy table: %d.\n", err); 4665 goto out; 4666 } 4667 4668 err = register_pernet_subsys(&addrconf_ops); 4669 if (err < 0) 4670 goto out_addrlabel; 4671 4672 /* The addrconf netdev notifier requires that loopback_dev 4673 * has it's ipv6 private information allocated and setup 4674 * before it can bring up and give link-local addresses 4675 * to other devices which are up. 4676 * 4677 * Unfortunately, loopback_dev is not necessarily the first 4678 * entry in the global dev_base list of net devices. In fact, 4679 * it is likely to be the very last entry on that list. 4680 * So this causes the notifier registry below to try and 4681 * give link-local addresses to all devices besides loopback_dev 4682 * first, then loopback_dev, which cases all the non-loopback_dev 4683 * devices to fail to get a link-local address. 4684 * 4685 * So, as a temporary fix, allocate the ipv6 structure for 4686 * loopback_dev first by hand. 4687 * Longer term, all of the dependencies ipv6 has upon the loopback 4688 * device and it being up should be removed. 4689 */ 4690 rtnl_lock(); 4691 if (!ipv6_add_dev(init_net.loopback_dev)) 4692 err = -ENOMEM; 4693 rtnl_unlock(); 4694 if (err) 4695 goto errlo; 4696 4697 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4698 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4699 4700 register_netdevice_notifier(&ipv6_dev_notf); 4701 4702 addrconf_verify(0); 4703 4704 err = rtnl_af_register(&inet6_ops); 4705 if (err < 0) 4706 goto errout_af; 4707 4708 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4709 if (err < 0) 4710 goto errout; 4711 4712 /* Only the first call to __rtnl_register can fail */ 4713 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4714 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4715 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4716 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4717 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4718 4719 ipv6_addr_label_rtnl_register(); 4720 4721 return 0; 4722 errout: 4723 rtnl_af_unregister(&inet6_ops); 4724 errout_af: 4725 unregister_netdevice_notifier(&ipv6_dev_notf); 4726 errlo: 4727 unregister_pernet_subsys(&addrconf_ops); 4728 out_addrlabel: 4729 ipv6_addr_label_cleanup(); 4730 out: 4731 return err; 4732 } 4733 4734 void addrconf_cleanup(void) 4735 { 4736 struct net_device *dev; 4737 int i; 4738 4739 unregister_netdevice_notifier(&ipv6_dev_notf); 4740 unregister_pernet_subsys(&addrconf_ops); 4741 ipv6_addr_label_cleanup(); 4742 4743 rtnl_lock(); 4744 4745 __rtnl_af_unregister(&inet6_ops); 4746 4747 /* clean dev list */ 4748 for_each_netdev(&init_net, dev) { 4749 if (__in6_dev_get(dev) == NULL) 4750 continue; 4751 addrconf_ifdown(dev, 1); 4752 } 4753 addrconf_ifdown(init_net.loopback_dev, 2); 4754 4755 /* 4756 * Check hash table. 4757 */ 4758 spin_lock_bh(&addrconf_hash_lock); 4759 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4760 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4761 spin_unlock_bh(&addrconf_hash_lock); 4762 4763 del_timer(&addr_chk_timer); 4764 rtnl_unlock(); 4765 } 4766