1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #include <linux/errno.h> 42 #include <linux/types.h> 43 #include <linux/kernel.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <linux/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 #include <linux/export.h> 91 92 /* Set to 3 to get tracing... */ 93 #define ACONF_DEBUG 2 94 95 #if ACONF_DEBUG >= 3 96 #define ADBG(x) printk x 97 #else 98 #define ADBG(x) 99 #endif 100 101 #define INFINITY_LIFE_TIME 0xFFFFFFFF 102 103 static inline u32 cstamp_delta(unsigned long cstamp) 104 { 105 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 106 } 107 108 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 109 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 110 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 111 112 #ifdef CONFIG_SYSCTL 113 static void addrconf_sysctl_register(struct inet6_dev *idev); 114 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 115 #else 116 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 117 { 118 } 119 120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 121 { 122 } 123 #endif 124 125 #ifdef CONFIG_IPV6_PRIVACY 126 static int __ipv6_regen_rndid(struct inet6_dev *idev); 127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 128 static void ipv6_regen_rndid(unsigned long data); 129 #endif 130 131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 132 static int ipv6_count_addresses(struct inet6_dev *idev); 133 134 /* 135 * Configured unicast address hash table 136 */ 137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 138 static DEFINE_SPINLOCK(addrconf_hash_lock); 139 140 static void addrconf_verify(unsigned long); 141 142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 143 static DEFINE_SPINLOCK(addrconf_verify_lock); 144 145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 147 148 static void addrconf_type_change(struct net_device *dev, 149 unsigned long event); 150 static int addrconf_ifdown(struct net_device *dev, int how); 151 152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 153 static void addrconf_dad_timer(unsigned long data); 154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 155 static void addrconf_dad_run(struct inet6_dev *idev); 156 static void addrconf_rs_timer(unsigned long data); 157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 159 160 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 161 struct prefix_info *pinfo); 162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 163 struct net_device *dev); 164 165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 166 167 static struct ipv6_devconf ipv6_devconf __read_mostly = { 168 .forwarding = 0, 169 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 170 .mtu6 = IPV6_MIN_MTU, 171 .accept_ra = 1, 172 .accept_redirects = 1, 173 .autoconf = 1, 174 .force_mld_version = 0, 175 .dad_transmits = 1, 176 .rtr_solicits = MAX_RTR_SOLICITATIONS, 177 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 178 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 179 #ifdef CONFIG_IPV6_PRIVACY 180 .use_tempaddr = 0, 181 .temp_valid_lft = TEMP_VALID_LIFETIME, 182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 183 .regen_max_retry = REGEN_MAX_RETRY, 184 .max_desync_factor = MAX_DESYNC_FACTOR, 185 #endif 186 .max_addresses = IPV6_MAX_ADDRESSES, 187 .accept_ra_defrtr = 1, 188 .accept_ra_pinfo = 1, 189 #ifdef CONFIG_IPV6_ROUTER_PREF 190 .accept_ra_rtr_pref = 1, 191 .rtr_probe_interval = 60 * HZ, 192 #ifdef CONFIG_IPV6_ROUTE_INFO 193 .accept_ra_rt_info_max_plen = 0, 194 #endif 195 #endif 196 .proxy_ndp = 0, 197 .accept_source_route = 0, /* we do not accept RH0 by default. */ 198 .disable_ipv6 = 0, 199 .accept_dad = 1, 200 }; 201 202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 203 .forwarding = 0, 204 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 205 .mtu6 = IPV6_MIN_MTU, 206 .accept_ra = 1, 207 .accept_redirects = 1, 208 .autoconf = 1, 209 .dad_transmits = 1, 210 .rtr_solicits = MAX_RTR_SOLICITATIONS, 211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 #ifdef CONFIG_IPV6_PRIVACY 214 .use_tempaddr = 0, 215 .temp_valid_lft = TEMP_VALID_LIFETIME, 216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 217 .regen_max_retry = REGEN_MAX_RETRY, 218 .max_desync_factor = MAX_DESYNC_FACTOR, 219 #endif 220 .max_addresses = IPV6_MAX_ADDRESSES, 221 .accept_ra_defrtr = 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_max_plen = 0, 228 #endif 229 #endif 230 .proxy_ndp = 0, 231 .accept_source_route = 0, /* we do not accept RH0 by default. */ 232 .disable_ipv6 = 0, 233 .accept_dad = 1, 234 }; 235 236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 241 242 /* Check if a valid qdisc is available */ 243 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 244 { 245 return !qdisc_tx_is_noop(dev); 246 } 247 248 /* Check if a route is valid prefix route */ 249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 250 { 251 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 252 } 253 254 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 255 { 256 if (del_timer(&ifp->timer)) 257 __in6_ifa_put(ifp); 258 } 259 260 enum addrconf_timer_t { 261 AC_NONE, 262 AC_DAD, 263 AC_RS, 264 }; 265 266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 267 enum addrconf_timer_t what, 268 unsigned long when) 269 { 270 if (!del_timer(&ifp->timer)) 271 in6_ifa_hold(ifp); 272 273 switch (what) { 274 case AC_DAD: 275 ifp->timer.function = addrconf_dad_timer; 276 break; 277 case AC_RS: 278 ifp->timer.function = addrconf_rs_timer; 279 break; 280 default: 281 break; 282 } 283 ifp->timer.expires = jiffies + when; 284 add_timer(&ifp->timer); 285 } 286 287 static int snmp6_alloc_dev(struct inet6_dev *idev) 288 { 289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 290 sizeof(struct ipstats_mib), 291 __alignof__(struct ipstats_mib)) < 0) 292 goto err_ip; 293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 294 GFP_KERNEL); 295 if (!idev->stats.icmpv6dev) 296 goto err_icmp; 297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 298 GFP_KERNEL); 299 if (!idev->stats.icmpv6msgdev) 300 goto err_icmpmsg; 301 302 return 0; 303 304 err_icmpmsg: 305 kfree(idev->stats.icmpv6dev); 306 err_icmp: 307 snmp_mib_free((void __percpu **)idev->stats.ipv6); 308 err_ip: 309 return -ENOMEM; 310 } 311 312 static void snmp6_free_dev(struct inet6_dev *idev) 313 { 314 kfree(idev->stats.icmpv6msgdev); 315 kfree(idev->stats.icmpv6dev); 316 snmp_mib_free((void __percpu **)idev->stats.ipv6); 317 } 318 319 /* Nobody refers to this device, we may destroy it. */ 320 321 void in6_dev_finish_destroy(struct inet6_dev *idev) 322 { 323 struct net_device *dev = idev->dev; 324 325 WARN_ON(!list_empty(&idev->addr_list)); 326 WARN_ON(idev->mc_list != NULL); 327 328 #ifdef NET_REFCNT_DEBUG 329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 330 #endif 331 dev_put(dev); 332 if (!idev->dead) { 333 pr_warning("Freeing alive inet6 device %p\n", idev); 334 return; 335 } 336 snmp6_free_dev(idev); 337 kfree_rcu(idev, rcu); 338 } 339 340 EXPORT_SYMBOL(in6_dev_finish_destroy); 341 342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 343 { 344 struct inet6_dev *ndev; 345 346 ASSERT_RTNL(); 347 348 if (dev->mtu < IPV6_MIN_MTU) 349 return NULL; 350 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 352 353 if (ndev == NULL) 354 return NULL; 355 356 rwlock_init(&ndev->lock); 357 ndev->dev = dev; 358 INIT_LIST_HEAD(&ndev->addr_list); 359 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 361 ndev->cnf.mtu6 = dev->mtu; 362 ndev->cnf.sysctl = NULL; 363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 364 if (ndev->nd_parms == NULL) { 365 kfree(ndev); 366 return NULL; 367 } 368 if (ndev->cnf.forwarding) 369 dev_disable_lro(dev); 370 /* We refer to the device */ 371 dev_hold(dev); 372 373 if (snmp6_alloc_dev(ndev) < 0) { 374 ADBG((KERN_WARNING 375 "%s(): cannot allocate memory for statistics; dev=%s.\n", 376 __func__, dev->name)); 377 neigh_parms_release(&nd_tbl, ndev->nd_parms); 378 dev_put(dev); 379 kfree(ndev); 380 return NULL; 381 } 382 383 if (snmp6_register_dev(ndev) < 0) { 384 ADBG((KERN_WARNING 385 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 386 __func__, dev->name)); 387 neigh_parms_release(&nd_tbl, ndev->nd_parms); 388 ndev->dead = 1; 389 in6_dev_finish_destroy(ndev); 390 return NULL; 391 } 392 393 /* One reference from device. We must do this before 394 * we invoke __ipv6_regen_rndid(). 395 */ 396 in6_dev_hold(ndev); 397 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 399 ndev->cnf.accept_dad = -1; 400 401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 403 printk(KERN_INFO 404 "%s: Disabled Multicast RS\n", 405 dev->name); 406 ndev->cnf.rtr_solicits = 0; 407 } 408 #endif 409 410 #ifdef CONFIG_IPV6_PRIVACY 411 INIT_LIST_HEAD(&ndev->tempaddr_list); 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 413 if ((dev->flags&IFF_LOOPBACK) || 414 dev->type == ARPHRD_TUNNEL || 415 dev->type == ARPHRD_TUNNEL6 || 416 dev->type == ARPHRD_SIT || 417 dev->type == ARPHRD_NONE) { 418 ndev->cnf.use_tempaddr = -1; 419 } else { 420 in6_dev_hold(ndev); 421 ipv6_regen_rndid((unsigned long) ndev); 422 } 423 #endif 424 425 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 426 ndev->if_flags |= IF_READY; 427 428 ipv6_mc_init_dev(ndev); 429 ndev->tstamp = jiffies; 430 addrconf_sysctl_register(ndev); 431 /* protected by rtnl_lock */ 432 rcu_assign_pointer(dev->ip6_ptr, ndev); 433 434 /* Join all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 436 437 /* Join all-router multicast group if forwarding is set */ 438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 440 441 return ndev; 442 } 443 444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 445 { 446 struct inet6_dev *idev; 447 448 ASSERT_RTNL(); 449 450 idev = __in6_dev_get(dev); 451 if (!idev) { 452 idev = ipv6_add_dev(dev); 453 if (!idev) 454 return NULL; 455 } 456 457 if (dev->flags&IFF_UP) 458 ipv6_mc_up(idev); 459 return idev; 460 } 461 462 #ifdef CONFIG_SYSCTL 463 static void dev_forward_change(struct inet6_dev *idev) 464 { 465 struct net_device *dev; 466 struct inet6_ifaddr *ifa; 467 468 if (!idev) 469 return; 470 dev = idev->dev; 471 if (idev->cnf.forwarding) 472 dev_disable_lro(dev); 473 if (dev && (dev->flags & IFF_MULTICAST)) { 474 if (idev->cnf.forwarding) 475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 476 else 477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 478 } 479 480 list_for_each_entry(ifa, &idev->addr_list, if_list) { 481 if (ifa->flags&IFA_F_TENTATIVE) 482 continue; 483 if (idev->cnf.forwarding) 484 addrconf_join_anycast(ifa); 485 else 486 addrconf_leave_anycast(ifa); 487 } 488 } 489 490 491 static void addrconf_forward_change(struct net *net, __s32 newf) 492 { 493 struct net_device *dev; 494 struct inet6_dev *idev; 495 496 rcu_read_lock(); 497 for_each_netdev_rcu(net, dev) { 498 idev = __in6_dev_get(dev); 499 if (idev) { 500 int changed = (!idev->cnf.forwarding) ^ (!newf); 501 idev->cnf.forwarding = newf; 502 if (changed) 503 dev_forward_change(idev); 504 } 505 } 506 rcu_read_unlock(); 507 } 508 509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 510 { 511 struct net *net; 512 int old; 513 514 if (!rtnl_trylock()) 515 return restart_syscall(); 516 517 net = (struct net *)table->extra2; 518 old = *p; 519 *p = newf; 520 521 if (p == &net->ipv6.devconf_dflt->forwarding) { 522 rtnl_unlock(); 523 return 0; 524 } 525 526 if (p == &net->ipv6.devconf_all->forwarding) { 527 net->ipv6.devconf_dflt->forwarding = newf; 528 addrconf_forward_change(net, newf); 529 } else if ((!newf) ^ (!old)) 530 dev_forward_change((struct inet6_dev *)table->extra1); 531 rtnl_unlock(); 532 533 if (newf) 534 rt6_purge_dflt_routers(net); 535 return 1; 536 } 537 #endif 538 539 /* Nobody refers to this ifaddr, destroy it */ 540 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 541 { 542 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 543 544 #ifdef NET_REFCNT_DEBUG 545 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 546 #endif 547 548 in6_dev_put(ifp->idev); 549 550 if (del_timer(&ifp->timer)) 551 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 552 553 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 554 pr_warning("Freeing alive inet6 address %p\n", ifp); 555 return; 556 } 557 dst_release(&ifp->rt->dst); 558 559 kfree_rcu(ifp, rcu); 560 } 561 562 static void 563 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 564 { 565 struct list_head *p; 566 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 567 568 /* 569 * Each device address list is sorted in order of scope - 570 * global before linklocal. 571 */ 572 list_for_each(p, &idev->addr_list) { 573 struct inet6_ifaddr *ifa 574 = list_entry(p, struct inet6_ifaddr, if_list); 575 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 576 break; 577 } 578 579 list_add_tail(&ifp->if_list, p); 580 } 581 582 static u32 ipv6_addr_hash(const struct in6_addr *addr) 583 { 584 /* 585 * We perform the hash function over the last 64 bits of the address 586 * This will include the IEEE address token on links that support it. 587 */ 588 return jhash_2words((__force u32)addr->s6_addr32[2], 589 (__force u32)addr->s6_addr32[3], 0) 590 & (IN6_ADDR_HSIZE - 1); 591 } 592 593 /* On success it returns ifp with increased reference count */ 594 595 static struct inet6_ifaddr * 596 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 597 int scope, u32 flags) 598 { 599 struct inet6_ifaddr *ifa = NULL; 600 struct rt6_info *rt; 601 unsigned int hash; 602 int err = 0; 603 int addr_type = ipv6_addr_type(addr); 604 605 if (addr_type == IPV6_ADDR_ANY || 606 addr_type & IPV6_ADDR_MULTICAST || 607 (!(idev->dev->flags & IFF_LOOPBACK) && 608 addr_type & IPV6_ADDR_LOOPBACK)) 609 return ERR_PTR(-EADDRNOTAVAIL); 610 611 rcu_read_lock_bh(); 612 if (idev->dead) { 613 err = -ENODEV; /*XXX*/ 614 goto out2; 615 } 616 617 if (idev->cnf.disable_ipv6) { 618 err = -EACCES; 619 goto out2; 620 } 621 622 spin_lock(&addrconf_hash_lock); 623 624 /* Ignore adding duplicate addresses on an interface */ 625 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 626 ADBG(("ipv6_add_addr: already assigned\n")); 627 err = -EEXIST; 628 goto out; 629 } 630 631 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 632 633 if (ifa == NULL) { 634 ADBG(("ipv6_add_addr: malloc failed\n")); 635 err = -ENOBUFS; 636 goto out; 637 } 638 639 rt = addrconf_dst_alloc(idev, addr, false); 640 if (IS_ERR(rt)) { 641 err = PTR_ERR(rt); 642 goto out; 643 } 644 645 ifa->addr = *addr; 646 647 spin_lock_init(&ifa->lock); 648 spin_lock_init(&ifa->state_lock); 649 init_timer(&ifa->timer); 650 INIT_HLIST_NODE(&ifa->addr_lst); 651 ifa->timer.data = (unsigned long) ifa; 652 ifa->scope = scope; 653 ifa->prefix_len = pfxlen; 654 ifa->flags = flags | IFA_F_TENTATIVE; 655 ifa->cstamp = ifa->tstamp = jiffies; 656 657 ifa->rt = rt; 658 659 ifa->idev = idev; 660 in6_dev_hold(idev); 661 /* For caller */ 662 in6_ifa_hold(ifa); 663 664 /* Add to big hash table */ 665 hash = ipv6_addr_hash(addr); 666 667 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 668 spin_unlock(&addrconf_hash_lock); 669 670 write_lock(&idev->lock); 671 /* Add to inet6_dev unicast addr list. */ 672 ipv6_link_dev_addr(idev, ifa); 673 674 #ifdef CONFIG_IPV6_PRIVACY 675 if (ifa->flags&IFA_F_TEMPORARY) { 676 list_add(&ifa->tmp_list, &idev->tempaddr_list); 677 in6_ifa_hold(ifa); 678 } 679 #endif 680 681 in6_ifa_hold(ifa); 682 write_unlock(&idev->lock); 683 out2: 684 rcu_read_unlock_bh(); 685 686 if (likely(err == 0)) 687 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 688 else { 689 kfree(ifa); 690 ifa = ERR_PTR(err); 691 } 692 693 return ifa; 694 out: 695 spin_unlock(&addrconf_hash_lock); 696 goto out2; 697 } 698 699 /* This function wants to get referenced ifp and releases it before return */ 700 701 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 702 { 703 struct inet6_ifaddr *ifa, *ifn; 704 struct inet6_dev *idev = ifp->idev; 705 int state; 706 int deleted = 0, onlink = 0; 707 unsigned long expires = jiffies; 708 709 spin_lock_bh(&ifp->state_lock); 710 state = ifp->state; 711 ifp->state = INET6_IFADDR_STATE_DEAD; 712 spin_unlock_bh(&ifp->state_lock); 713 714 if (state == INET6_IFADDR_STATE_DEAD) 715 goto out; 716 717 spin_lock_bh(&addrconf_hash_lock); 718 hlist_del_init_rcu(&ifp->addr_lst); 719 spin_unlock_bh(&addrconf_hash_lock); 720 721 write_lock_bh(&idev->lock); 722 #ifdef CONFIG_IPV6_PRIVACY 723 if (ifp->flags&IFA_F_TEMPORARY) { 724 list_del(&ifp->tmp_list); 725 if (ifp->ifpub) { 726 in6_ifa_put(ifp->ifpub); 727 ifp->ifpub = NULL; 728 } 729 __in6_ifa_put(ifp); 730 } 731 #endif 732 733 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 734 if (ifa == ifp) { 735 list_del_init(&ifp->if_list); 736 __in6_ifa_put(ifp); 737 738 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 739 break; 740 deleted = 1; 741 continue; 742 } else if (ifp->flags & IFA_F_PERMANENT) { 743 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 744 ifp->prefix_len)) { 745 if (ifa->flags & IFA_F_PERMANENT) { 746 onlink = 1; 747 if (deleted) 748 break; 749 } else { 750 unsigned long lifetime; 751 752 if (!onlink) 753 onlink = -1; 754 755 spin_lock(&ifa->lock); 756 757 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 758 /* 759 * Note: Because this address is 760 * not permanent, lifetime < 761 * LONG_MAX / HZ here. 762 */ 763 if (time_before(expires, 764 ifa->tstamp + lifetime * HZ)) 765 expires = ifa->tstamp + lifetime * HZ; 766 spin_unlock(&ifa->lock); 767 } 768 } 769 } 770 } 771 write_unlock_bh(&idev->lock); 772 773 addrconf_del_timer(ifp); 774 775 ipv6_ifa_notify(RTM_DELADDR, ifp); 776 777 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 778 779 /* 780 * Purge or update corresponding prefix 781 * 782 * 1) we don't purge prefix here if address was not permanent. 783 * prefix is managed by its own lifetime. 784 * 2) if there're no addresses, delete prefix. 785 * 3) if there're still other permanent address(es), 786 * corresponding prefix is still permanent. 787 * 4) otherwise, update prefix lifetime to the 788 * longest valid lifetime among the corresponding 789 * addresses on the device. 790 * Note: subsequent RA will update lifetime. 791 * 792 * --yoshfuji 793 */ 794 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 795 struct in6_addr prefix; 796 struct rt6_info *rt; 797 struct net *net = dev_net(ifp->idev->dev); 798 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 799 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 800 801 if (rt && addrconf_is_prefix_route(rt)) { 802 if (onlink == 0) { 803 ip6_del_rt(rt); 804 rt = NULL; 805 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 806 rt6_set_expires(rt, expires); 807 } 808 } 809 dst_release(&rt->dst); 810 } 811 812 /* clean up prefsrc entries */ 813 rt6_remove_prefsrc(ifp); 814 out: 815 in6_ifa_put(ifp); 816 } 817 818 #ifdef CONFIG_IPV6_PRIVACY 819 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 820 { 821 struct inet6_dev *idev = ifp->idev; 822 struct in6_addr addr, *tmpaddr; 823 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 824 unsigned long regen_advance; 825 int tmp_plen; 826 int ret = 0; 827 int max_addresses; 828 u32 addr_flags; 829 unsigned long now = jiffies; 830 831 write_lock(&idev->lock); 832 if (ift) { 833 spin_lock_bh(&ift->lock); 834 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 835 spin_unlock_bh(&ift->lock); 836 tmpaddr = &addr; 837 } else { 838 tmpaddr = NULL; 839 } 840 retry: 841 in6_dev_hold(idev); 842 if (idev->cnf.use_tempaddr <= 0) { 843 write_unlock(&idev->lock); 844 printk(KERN_INFO 845 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 846 in6_dev_put(idev); 847 ret = -1; 848 goto out; 849 } 850 spin_lock_bh(&ifp->lock); 851 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 852 idev->cnf.use_tempaddr = -1; /*XXX*/ 853 spin_unlock_bh(&ifp->lock); 854 write_unlock(&idev->lock); 855 printk(KERN_WARNING 856 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 857 in6_dev_put(idev); 858 ret = -1; 859 goto out; 860 } 861 in6_ifa_hold(ifp); 862 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 863 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 864 spin_unlock_bh(&ifp->lock); 865 write_unlock(&idev->lock); 866 printk(KERN_WARNING 867 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 868 in6_ifa_put(ifp); 869 in6_dev_put(idev); 870 ret = -1; 871 goto out; 872 } 873 memcpy(&addr.s6_addr[8], idev->rndid, 8); 874 age = (now - ifp->tstamp) / HZ; 875 tmp_valid_lft = min_t(__u32, 876 ifp->valid_lft, 877 idev->cnf.temp_valid_lft + age); 878 tmp_prefered_lft = min_t(__u32, 879 ifp->prefered_lft, 880 idev->cnf.temp_prefered_lft + age - 881 idev->cnf.max_desync_factor); 882 tmp_plen = ifp->prefix_len; 883 max_addresses = idev->cnf.max_addresses; 884 tmp_tstamp = ifp->tstamp; 885 spin_unlock_bh(&ifp->lock); 886 887 regen_advance = idev->cnf.regen_max_retry * 888 idev->cnf.dad_transmits * 889 idev->nd_parms->retrans_time / HZ; 890 write_unlock(&idev->lock); 891 892 /* A temporary address is created only if this calculated Preferred 893 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 894 * an implementation must not create a temporary address with a zero 895 * Preferred Lifetime. 896 */ 897 if (tmp_prefered_lft <= regen_advance) { 898 in6_ifa_put(ifp); 899 in6_dev_put(idev); 900 ret = -1; 901 goto out; 902 } 903 904 addr_flags = IFA_F_TEMPORARY; 905 /* set in addrconf_prefix_rcv() */ 906 if (ifp->flags & IFA_F_OPTIMISTIC) 907 addr_flags |= IFA_F_OPTIMISTIC; 908 909 ift = !max_addresses || 910 ipv6_count_addresses(idev) < max_addresses ? 911 ipv6_add_addr(idev, &addr, tmp_plen, 912 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 913 addr_flags) : NULL; 914 if (!ift || IS_ERR(ift)) { 915 in6_ifa_put(ifp); 916 in6_dev_put(idev); 917 printk(KERN_INFO 918 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 919 tmpaddr = &addr; 920 write_lock(&idev->lock); 921 goto retry; 922 } 923 924 spin_lock_bh(&ift->lock); 925 ift->ifpub = ifp; 926 ift->valid_lft = tmp_valid_lft; 927 ift->prefered_lft = tmp_prefered_lft; 928 ift->cstamp = now; 929 ift->tstamp = tmp_tstamp; 930 spin_unlock_bh(&ift->lock); 931 932 addrconf_dad_start(ift, 0); 933 in6_ifa_put(ift); 934 in6_dev_put(idev); 935 out: 936 return ret; 937 } 938 #endif 939 940 /* 941 * Choose an appropriate source address (RFC3484) 942 */ 943 enum { 944 IPV6_SADDR_RULE_INIT = 0, 945 IPV6_SADDR_RULE_LOCAL, 946 IPV6_SADDR_RULE_SCOPE, 947 IPV6_SADDR_RULE_PREFERRED, 948 #ifdef CONFIG_IPV6_MIP6 949 IPV6_SADDR_RULE_HOA, 950 #endif 951 IPV6_SADDR_RULE_OIF, 952 IPV6_SADDR_RULE_LABEL, 953 #ifdef CONFIG_IPV6_PRIVACY 954 IPV6_SADDR_RULE_PRIVACY, 955 #endif 956 IPV6_SADDR_RULE_ORCHID, 957 IPV6_SADDR_RULE_PREFIX, 958 IPV6_SADDR_RULE_MAX 959 }; 960 961 struct ipv6_saddr_score { 962 int rule; 963 int addr_type; 964 struct inet6_ifaddr *ifa; 965 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 966 int scopedist; 967 int matchlen; 968 }; 969 970 struct ipv6_saddr_dst { 971 const struct in6_addr *addr; 972 int ifindex; 973 int scope; 974 int label; 975 unsigned int prefs; 976 }; 977 978 static inline int ipv6_saddr_preferred(int type) 979 { 980 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 981 return 1; 982 return 0; 983 } 984 985 static int ipv6_get_saddr_eval(struct net *net, 986 struct ipv6_saddr_score *score, 987 struct ipv6_saddr_dst *dst, 988 int i) 989 { 990 int ret; 991 992 if (i <= score->rule) { 993 switch (i) { 994 case IPV6_SADDR_RULE_SCOPE: 995 ret = score->scopedist; 996 break; 997 case IPV6_SADDR_RULE_PREFIX: 998 ret = score->matchlen; 999 break; 1000 default: 1001 ret = !!test_bit(i, score->scorebits); 1002 } 1003 goto out; 1004 } 1005 1006 switch (i) { 1007 case IPV6_SADDR_RULE_INIT: 1008 /* Rule 0: remember if hiscore is not ready yet */ 1009 ret = !!score->ifa; 1010 break; 1011 case IPV6_SADDR_RULE_LOCAL: 1012 /* Rule 1: Prefer same address */ 1013 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1014 break; 1015 case IPV6_SADDR_RULE_SCOPE: 1016 /* Rule 2: Prefer appropriate scope 1017 * 1018 * ret 1019 * ^ 1020 * -1 | d 15 1021 * ---+--+-+---> scope 1022 * | 1023 * | d is scope of the destination. 1024 * B-d | \ 1025 * | \ <- smaller scope is better if 1026 * B-15 | \ if scope is enough for destinaion. 1027 * | ret = B - scope (-1 <= scope >= d <= 15). 1028 * d-C-1 | / 1029 * |/ <- greater is better 1030 * -C / if scope is not enough for destination. 1031 * /| ret = scope - C (-1 <= d < scope <= 15). 1032 * 1033 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1034 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1035 * Assume B = 0 and we get C > 29. 1036 */ 1037 ret = __ipv6_addr_src_scope(score->addr_type); 1038 if (ret >= dst->scope) 1039 ret = -ret; 1040 else 1041 ret -= 128; /* 30 is enough */ 1042 score->scopedist = ret; 1043 break; 1044 case IPV6_SADDR_RULE_PREFERRED: 1045 /* Rule 3: Avoid deprecated and optimistic addresses */ 1046 ret = ipv6_saddr_preferred(score->addr_type) || 1047 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1048 break; 1049 #ifdef CONFIG_IPV6_MIP6 1050 case IPV6_SADDR_RULE_HOA: 1051 { 1052 /* Rule 4: Prefer home address */ 1053 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1054 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1055 break; 1056 } 1057 #endif 1058 case IPV6_SADDR_RULE_OIF: 1059 /* Rule 5: Prefer outgoing interface */ 1060 ret = (!dst->ifindex || 1061 dst->ifindex == score->ifa->idev->dev->ifindex); 1062 break; 1063 case IPV6_SADDR_RULE_LABEL: 1064 /* Rule 6: Prefer matching label */ 1065 ret = ipv6_addr_label(net, 1066 &score->ifa->addr, score->addr_type, 1067 score->ifa->idev->dev->ifindex) == dst->label; 1068 break; 1069 #ifdef CONFIG_IPV6_PRIVACY 1070 case IPV6_SADDR_RULE_PRIVACY: 1071 { 1072 /* Rule 7: Prefer public address 1073 * Note: prefer temporary address if use_tempaddr >= 2 1074 */ 1075 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1076 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1077 score->ifa->idev->cnf.use_tempaddr >= 2; 1078 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1079 break; 1080 } 1081 #endif 1082 case IPV6_SADDR_RULE_ORCHID: 1083 /* Rule 8-: Prefer ORCHID vs ORCHID or 1084 * non-ORCHID vs non-ORCHID 1085 */ 1086 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1087 ipv6_addr_orchid(dst->addr)); 1088 break; 1089 case IPV6_SADDR_RULE_PREFIX: 1090 /* Rule 8: Use longest matching prefix */ 1091 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1092 dst->addr); 1093 break; 1094 default: 1095 ret = 0; 1096 } 1097 1098 if (ret) 1099 __set_bit(i, score->scorebits); 1100 score->rule = i; 1101 out: 1102 return ret; 1103 } 1104 1105 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1106 const struct in6_addr *daddr, unsigned int prefs, 1107 struct in6_addr *saddr) 1108 { 1109 struct ipv6_saddr_score scores[2], 1110 *score = &scores[0], *hiscore = &scores[1]; 1111 struct ipv6_saddr_dst dst; 1112 struct net_device *dev; 1113 int dst_type; 1114 1115 dst_type = __ipv6_addr_type(daddr); 1116 dst.addr = daddr; 1117 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1118 dst.scope = __ipv6_addr_src_scope(dst_type); 1119 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1120 dst.prefs = prefs; 1121 1122 hiscore->rule = -1; 1123 hiscore->ifa = NULL; 1124 1125 rcu_read_lock(); 1126 1127 for_each_netdev_rcu(net, dev) { 1128 struct inet6_dev *idev; 1129 1130 /* Candidate Source Address (section 4) 1131 * - multicast and link-local destination address, 1132 * the set of candidate source address MUST only 1133 * include addresses assigned to interfaces 1134 * belonging to the same link as the outgoing 1135 * interface. 1136 * (- For site-local destination addresses, the 1137 * set of candidate source addresses MUST only 1138 * include addresses assigned to interfaces 1139 * belonging to the same site as the outgoing 1140 * interface.) 1141 */ 1142 if (((dst_type & IPV6_ADDR_MULTICAST) || 1143 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1144 dst.ifindex && dev->ifindex != dst.ifindex) 1145 continue; 1146 1147 idev = __in6_dev_get(dev); 1148 if (!idev) 1149 continue; 1150 1151 read_lock_bh(&idev->lock); 1152 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1153 int i; 1154 1155 /* 1156 * - Tentative Address (RFC2462 section 5.4) 1157 * - A tentative address is not considered 1158 * "assigned to an interface" in the traditional 1159 * sense, unless it is also flagged as optimistic. 1160 * - Candidate Source Address (section 4) 1161 * - In any case, anycast addresses, multicast 1162 * addresses, and the unspecified address MUST 1163 * NOT be included in a candidate set. 1164 */ 1165 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1166 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1167 continue; 1168 1169 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1170 1171 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1172 score->addr_type & IPV6_ADDR_MULTICAST)) { 1173 LIMIT_NETDEBUG(KERN_DEBUG 1174 "ADDRCONF: unspecified / multicast address " 1175 "assigned as unicast address on %s", 1176 dev->name); 1177 continue; 1178 } 1179 1180 score->rule = -1; 1181 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1182 1183 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1184 int minihiscore, miniscore; 1185 1186 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1187 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1188 1189 if (minihiscore > miniscore) { 1190 if (i == IPV6_SADDR_RULE_SCOPE && 1191 score->scopedist > 0) { 1192 /* 1193 * special case: 1194 * each remaining entry 1195 * has too small (not enough) 1196 * scope, because ifa entries 1197 * are sorted by their scope 1198 * values. 1199 */ 1200 goto try_nextdev; 1201 } 1202 break; 1203 } else if (minihiscore < miniscore) { 1204 if (hiscore->ifa) 1205 in6_ifa_put(hiscore->ifa); 1206 1207 in6_ifa_hold(score->ifa); 1208 1209 swap(hiscore, score); 1210 1211 /* restore our iterator */ 1212 score->ifa = hiscore->ifa; 1213 1214 break; 1215 } 1216 } 1217 } 1218 try_nextdev: 1219 read_unlock_bh(&idev->lock); 1220 } 1221 rcu_read_unlock(); 1222 1223 if (!hiscore->ifa) 1224 return -EADDRNOTAVAIL; 1225 1226 *saddr = hiscore->ifa->addr; 1227 in6_ifa_put(hiscore->ifa); 1228 return 0; 1229 } 1230 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1231 1232 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1233 unsigned char banned_flags) 1234 { 1235 struct inet6_dev *idev; 1236 int err = -EADDRNOTAVAIL; 1237 1238 rcu_read_lock(); 1239 idev = __in6_dev_get(dev); 1240 if (idev) { 1241 struct inet6_ifaddr *ifp; 1242 1243 read_lock_bh(&idev->lock); 1244 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1245 if (ifp->scope == IFA_LINK && 1246 !(ifp->flags & banned_flags)) { 1247 *addr = ifp->addr; 1248 err = 0; 1249 break; 1250 } 1251 } 1252 read_unlock_bh(&idev->lock); 1253 } 1254 rcu_read_unlock(); 1255 return err; 1256 } 1257 1258 static int ipv6_count_addresses(struct inet6_dev *idev) 1259 { 1260 int cnt = 0; 1261 struct inet6_ifaddr *ifp; 1262 1263 read_lock_bh(&idev->lock); 1264 list_for_each_entry(ifp, &idev->addr_list, if_list) 1265 cnt++; 1266 read_unlock_bh(&idev->lock); 1267 return cnt; 1268 } 1269 1270 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1271 struct net_device *dev, int strict) 1272 { 1273 struct inet6_ifaddr *ifp; 1274 struct hlist_node *node; 1275 unsigned int hash = ipv6_addr_hash(addr); 1276 1277 rcu_read_lock_bh(); 1278 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1279 if (!net_eq(dev_net(ifp->idev->dev), net)) 1280 continue; 1281 if (ipv6_addr_equal(&ifp->addr, addr) && 1282 !(ifp->flags&IFA_F_TENTATIVE) && 1283 (dev == NULL || ifp->idev->dev == dev || 1284 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1285 rcu_read_unlock_bh(); 1286 return 1; 1287 } 1288 } 1289 1290 rcu_read_unlock_bh(); 1291 return 0; 1292 } 1293 EXPORT_SYMBOL(ipv6_chk_addr); 1294 1295 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1296 struct net_device *dev) 1297 { 1298 unsigned int hash = ipv6_addr_hash(addr); 1299 struct inet6_ifaddr *ifp; 1300 struct hlist_node *node; 1301 1302 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1303 if (!net_eq(dev_net(ifp->idev->dev), net)) 1304 continue; 1305 if (ipv6_addr_equal(&ifp->addr, addr)) { 1306 if (dev == NULL || ifp->idev->dev == dev) 1307 return true; 1308 } 1309 } 1310 return false; 1311 } 1312 1313 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1314 { 1315 struct inet6_dev *idev; 1316 struct inet6_ifaddr *ifa; 1317 int onlink; 1318 1319 onlink = 0; 1320 rcu_read_lock(); 1321 idev = __in6_dev_get(dev); 1322 if (idev) { 1323 read_lock_bh(&idev->lock); 1324 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1325 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1326 ifa->prefix_len); 1327 if (onlink) 1328 break; 1329 } 1330 read_unlock_bh(&idev->lock); 1331 } 1332 rcu_read_unlock(); 1333 return onlink; 1334 } 1335 1336 EXPORT_SYMBOL(ipv6_chk_prefix); 1337 1338 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1339 struct net_device *dev, int strict) 1340 { 1341 struct inet6_ifaddr *ifp, *result = NULL; 1342 unsigned int hash = ipv6_addr_hash(addr); 1343 struct hlist_node *node; 1344 1345 rcu_read_lock_bh(); 1346 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1347 if (!net_eq(dev_net(ifp->idev->dev), net)) 1348 continue; 1349 if (ipv6_addr_equal(&ifp->addr, addr)) { 1350 if (dev == NULL || ifp->idev->dev == dev || 1351 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1352 result = ifp; 1353 in6_ifa_hold(ifp); 1354 break; 1355 } 1356 } 1357 } 1358 rcu_read_unlock_bh(); 1359 1360 return result; 1361 } 1362 1363 /* Gets referenced address, destroys ifaddr */ 1364 1365 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1366 { 1367 if (ifp->flags&IFA_F_PERMANENT) { 1368 spin_lock_bh(&ifp->lock); 1369 addrconf_del_timer(ifp); 1370 ifp->flags |= IFA_F_TENTATIVE; 1371 if (dad_failed) 1372 ifp->flags |= IFA_F_DADFAILED; 1373 spin_unlock_bh(&ifp->lock); 1374 if (dad_failed) 1375 ipv6_ifa_notify(0, ifp); 1376 in6_ifa_put(ifp); 1377 #ifdef CONFIG_IPV6_PRIVACY 1378 } else if (ifp->flags&IFA_F_TEMPORARY) { 1379 struct inet6_ifaddr *ifpub; 1380 spin_lock_bh(&ifp->lock); 1381 ifpub = ifp->ifpub; 1382 if (ifpub) { 1383 in6_ifa_hold(ifpub); 1384 spin_unlock_bh(&ifp->lock); 1385 ipv6_create_tempaddr(ifpub, ifp); 1386 in6_ifa_put(ifpub); 1387 } else { 1388 spin_unlock_bh(&ifp->lock); 1389 } 1390 ipv6_del_addr(ifp); 1391 #endif 1392 } else 1393 ipv6_del_addr(ifp); 1394 } 1395 1396 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1397 { 1398 int err = -ENOENT; 1399 1400 spin_lock(&ifp->state_lock); 1401 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1402 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1403 err = 0; 1404 } 1405 spin_unlock(&ifp->state_lock); 1406 1407 return err; 1408 } 1409 1410 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1411 { 1412 struct inet6_dev *idev = ifp->idev; 1413 1414 if (addrconf_dad_end(ifp)) { 1415 in6_ifa_put(ifp); 1416 return; 1417 } 1418 1419 if (net_ratelimit()) 1420 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1421 ifp->idev->dev->name, &ifp->addr); 1422 1423 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1424 struct in6_addr addr; 1425 1426 addr.s6_addr32[0] = htonl(0xfe800000); 1427 addr.s6_addr32[1] = 0; 1428 1429 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1430 ipv6_addr_equal(&ifp->addr, &addr)) { 1431 /* DAD failed for link-local based on MAC address */ 1432 idev->cnf.disable_ipv6 = 1; 1433 1434 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1435 ifp->idev->dev->name); 1436 } 1437 } 1438 1439 addrconf_dad_stop(ifp, 1); 1440 } 1441 1442 /* Join to solicited addr multicast group. */ 1443 1444 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1445 { 1446 struct in6_addr maddr; 1447 1448 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1449 return; 1450 1451 addrconf_addr_solict_mult(addr, &maddr); 1452 ipv6_dev_mc_inc(dev, &maddr); 1453 } 1454 1455 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1456 { 1457 struct in6_addr maddr; 1458 1459 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1460 return; 1461 1462 addrconf_addr_solict_mult(addr, &maddr); 1463 __ipv6_dev_mc_dec(idev, &maddr); 1464 } 1465 1466 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1467 { 1468 struct in6_addr addr; 1469 if (ifp->prefix_len == 127) /* RFC 6164 */ 1470 return; 1471 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1472 if (ipv6_addr_any(&addr)) 1473 return; 1474 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1475 } 1476 1477 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1478 { 1479 struct in6_addr addr; 1480 if (ifp->prefix_len == 127) /* RFC 6164 */ 1481 return; 1482 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1483 if (ipv6_addr_any(&addr)) 1484 return; 1485 __ipv6_dev_ac_dec(ifp->idev, &addr); 1486 } 1487 1488 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1489 { 1490 if (dev->addr_len != ETH_ALEN) 1491 return -1; 1492 memcpy(eui, dev->dev_addr, 3); 1493 memcpy(eui + 5, dev->dev_addr + 3, 3); 1494 1495 /* 1496 * The zSeries OSA network cards can be shared among various 1497 * OS instances, but the OSA cards have only one MAC address. 1498 * This leads to duplicate address conflicts in conjunction 1499 * with IPv6 if more than one instance uses the same card. 1500 * 1501 * The driver for these cards can deliver a unique 16-bit 1502 * identifier for each instance sharing the same card. It is 1503 * placed instead of 0xFFFE in the interface identifier. The 1504 * "u" bit of the interface identifier is not inverted in this 1505 * case. Hence the resulting interface identifier has local 1506 * scope according to RFC2373. 1507 */ 1508 if (dev->dev_id) { 1509 eui[3] = (dev->dev_id >> 8) & 0xFF; 1510 eui[4] = dev->dev_id & 0xFF; 1511 } else { 1512 eui[3] = 0xFF; 1513 eui[4] = 0xFE; 1514 eui[0] ^= 2; 1515 } 1516 return 0; 1517 } 1518 1519 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1520 { 1521 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1522 if (dev->addr_len != ARCNET_ALEN) 1523 return -1; 1524 memset(eui, 0, 7); 1525 eui[7] = *(u8*)dev->dev_addr; 1526 return 0; 1527 } 1528 1529 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1530 { 1531 if (dev->addr_len != INFINIBAND_ALEN) 1532 return -1; 1533 memcpy(eui, dev->dev_addr + 12, 8); 1534 eui[0] |= 2; 1535 return 0; 1536 } 1537 1538 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1539 { 1540 if (addr == 0) 1541 return -1; 1542 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1543 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1544 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1545 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1546 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1547 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1548 eui[1] = 0; 1549 eui[2] = 0x5E; 1550 eui[3] = 0xFE; 1551 memcpy(eui + 4, &addr, 4); 1552 return 0; 1553 } 1554 1555 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1556 { 1557 if (dev->priv_flags & IFF_ISATAP) 1558 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1559 return -1; 1560 } 1561 1562 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1563 { 1564 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1565 } 1566 1567 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1568 { 1569 switch (dev->type) { 1570 case ARPHRD_ETHER: 1571 case ARPHRD_FDDI: 1572 case ARPHRD_IEEE802_TR: 1573 return addrconf_ifid_eui48(eui, dev); 1574 case ARPHRD_ARCNET: 1575 return addrconf_ifid_arcnet(eui, dev); 1576 case ARPHRD_INFINIBAND: 1577 return addrconf_ifid_infiniband(eui, dev); 1578 case ARPHRD_SIT: 1579 return addrconf_ifid_sit(eui, dev); 1580 case ARPHRD_IPGRE: 1581 return addrconf_ifid_gre(eui, dev); 1582 } 1583 return -1; 1584 } 1585 1586 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1587 { 1588 int err = -1; 1589 struct inet6_ifaddr *ifp; 1590 1591 read_lock_bh(&idev->lock); 1592 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1593 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1594 memcpy(eui, ifp->addr.s6_addr+8, 8); 1595 err = 0; 1596 break; 1597 } 1598 } 1599 read_unlock_bh(&idev->lock); 1600 return err; 1601 } 1602 1603 #ifdef CONFIG_IPV6_PRIVACY 1604 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1605 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1606 { 1607 regen: 1608 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1609 idev->rndid[0] &= ~0x02; 1610 1611 /* 1612 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1613 * check if generated address is not inappropriate 1614 * 1615 * - Reserved subnet anycast (RFC 2526) 1616 * 11111101 11....11 1xxxxxxx 1617 * - ISATAP (RFC4214) 6.1 1618 * 00-00-5E-FE-xx-xx-xx-xx 1619 * - value 0 1620 * - XXX: already assigned to an address on the device 1621 */ 1622 if (idev->rndid[0] == 0xfd && 1623 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1624 (idev->rndid[7]&0x80)) 1625 goto regen; 1626 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1627 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1628 goto regen; 1629 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1630 goto regen; 1631 } 1632 1633 return 0; 1634 } 1635 1636 static void ipv6_regen_rndid(unsigned long data) 1637 { 1638 struct inet6_dev *idev = (struct inet6_dev *) data; 1639 unsigned long expires; 1640 1641 rcu_read_lock_bh(); 1642 write_lock_bh(&idev->lock); 1643 1644 if (idev->dead) 1645 goto out; 1646 1647 if (__ipv6_regen_rndid(idev) < 0) 1648 goto out; 1649 1650 expires = jiffies + 1651 idev->cnf.temp_prefered_lft * HZ - 1652 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1653 idev->cnf.max_desync_factor * HZ; 1654 if (time_before(expires, jiffies)) { 1655 printk(KERN_WARNING 1656 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1657 idev->dev->name); 1658 goto out; 1659 } 1660 1661 if (!mod_timer(&idev->regen_timer, expires)) 1662 in6_dev_hold(idev); 1663 1664 out: 1665 write_unlock_bh(&idev->lock); 1666 rcu_read_unlock_bh(); 1667 in6_dev_put(idev); 1668 } 1669 1670 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1671 int ret = 0; 1672 1673 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1674 ret = __ipv6_regen_rndid(idev); 1675 return ret; 1676 } 1677 #endif 1678 1679 /* 1680 * Add prefix route. 1681 */ 1682 1683 static void 1684 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1685 unsigned long expires, u32 flags) 1686 { 1687 struct fib6_config cfg = { 1688 .fc_table = RT6_TABLE_PREFIX, 1689 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1690 .fc_ifindex = dev->ifindex, 1691 .fc_expires = expires, 1692 .fc_dst_len = plen, 1693 .fc_flags = RTF_UP | flags, 1694 .fc_nlinfo.nl_net = dev_net(dev), 1695 .fc_protocol = RTPROT_KERNEL, 1696 }; 1697 1698 cfg.fc_dst = *pfx; 1699 1700 /* Prevent useless cloning on PtP SIT. 1701 This thing is done here expecting that the whole 1702 class of non-broadcast devices need not cloning. 1703 */ 1704 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1705 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1706 cfg.fc_flags |= RTF_NONEXTHOP; 1707 #endif 1708 1709 ip6_route_add(&cfg); 1710 } 1711 1712 1713 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1714 int plen, 1715 const struct net_device *dev, 1716 u32 flags, u32 noflags) 1717 { 1718 struct fib6_node *fn; 1719 struct rt6_info *rt = NULL; 1720 struct fib6_table *table; 1721 1722 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1723 if (table == NULL) 1724 return NULL; 1725 1726 write_lock_bh(&table->tb6_lock); 1727 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1728 if (!fn) 1729 goto out; 1730 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1731 if (rt->dst.dev->ifindex != dev->ifindex) 1732 continue; 1733 if ((rt->rt6i_flags & flags) != flags) 1734 continue; 1735 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0)) 1736 continue; 1737 dst_hold(&rt->dst); 1738 break; 1739 } 1740 out: 1741 write_unlock_bh(&table->tb6_lock); 1742 return rt; 1743 } 1744 1745 1746 /* Create "default" multicast route to the interface */ 1747 1748 static void addrconf_add_mroute(struct net_device *dev) 1749 { 1750 struct fib6_config cfg = { 1751 .fc_table = RT6_TABLE_LOCAL, 1752 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1753 .fc_ifindex = dev->ifindex, 1754 .fc_dst_len = 8, 1755 .fc_flags = RTF_UP, 1756 .fc_nlinfo.nl_net = dev_net(dev), 1757 }; 1758 1759 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1760 1761 ip6_route_add(&cfg); 1762 } 1763 1764 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1765 static void sit_route_add(struct net_device *dev) 1766 { 1767 struct fib6_config cfg = { 1768 .fc_table = RT6_TABLE_MAIN, 1769 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1770 .fc_ifindex = dev->ifindex, 1771 .fc_dst_len = 96, 1772 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1773 .fc_nlinfo.nl_net = dev_net(dev), 1774 }; 1775 1776 /* prefix length - 96 bits "::d.d.d.d" */ 1777 ip6_route_add(&cfg); 1778 } 1779 #endif 1780 1781 static void addrconf_add_lroute(struct net_device *dev) 1782 { 1783 struct in6_addr addr; 1784 1785 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1786 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1787 } 1788 1789 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1790 { 1791 struct inet6_dev *idev; 1792 1793 ASSERT_RTNL(); 1794 1795 idev = ipv6_find_idev(dev); 1796 if (!idev) 1797 return ERR_PTR(-ENOBUFS); 1798 1799 if (idev->cnf.disable_ipv6) 1800 return ERR_PTR(-EACCES); 1801 1802 /* Add default multicast route */ 1803 if (!(dev->flags & IFF_LOOPBACK)) 1804 addrconf_add_mroute(dev); 1805 1806 /* Add link local route */ 1807 addrconf_add_lroute(dev); 1808 return idev; 1809 } 1810 1811 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 1812 { 1813 struct prefix_info *pinfo; 1814 __u32 valid_lft; 1815 __u32 prefered_lft; 1816 int addr_type; 1817 struct inet6_dev *in6_dev; 1818 struct net *net = dev_net(dev); 1819 1820 pinfo = (struct prefix_info *) opt; 1821 1822 if (len < sizeof(struct prefix_info)) { 1823 ADBG(("addrconf: prefix option too short\n")); 1824 return; 1825 } 1826 1827 /* 1828 * Validation checks ([ADDRCONF], page 19) 1829 */ 1830 1831 addr_type = ipv6_addr_type(&pinfo->prefix); 1832 1833 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1834 return; 1835 1836 valid_lft = ntohl(pinfo->valid); 1837 prefered_lft = ntohl(pinfo->prefered); 1838 1839 if (prefered_lft > valid_lft) { 1840 if (net_ratelimit()) 1841 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1842 return; 1843 } 1844 1845 in6_dev = in6_dev_get(dev); 1846 1847 if (in6_dev == NULL) { 1848 if (net_ratelimit()) 1849 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1850 return; 1851 } 1852 1853 /* 1854 * Two things going on here: 1855 * 1) Add routes for on-link prefixes 1856 * 2) Configure prefixes with the auto flag set 1857 */ 1858 1859 if (pinfo->onlink) { 1860 struct rt6_info *rt; 1861 unsigned long rt_expires; 1862 1863 /* Avoid arithmetic overflow. Really, we could 1864 * save rt_expires in seconds, likely valid_lft, 1865 * but it would require division in fib gc, that it 1866 * not good. 1867 */ 1868 if (HZ > USER_HZ) 1869 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1870 else 1871 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1872 1873 if (addrconf_finite_timeout(rt_expires)) 1874 rt_expires *= HZ; 1875 1876 rt = addrconf_get_prefix_route(&pinfo->prefix, 1877 pinfo->prefix_len, 1878 dev, 1879 RTF_ADDRCONF | RTF_PREFIX_RT, 1880 RTF_GATEWAY | RTF_DEFAULT); 1881 1882 if (rt) { 1883 /* Autoconf prefix route */ 1884 if (valid_lft == 0) { 1885 ip6_del_rt(rt); 1886 rt = NULL; 1887 } else if (addrconf_finite_timeout(rt_expires)) { 1888 /* not infinity */ 1889 rt6_set_expires(rt, jiffies + rt_expires); 1890 } else { 1891 rt6_clean_expires(rt); 1892 } 1893 } else if (valid_lft) { 1894 clock_t expires = 0; 1895 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1896 if (addrconf_finite_timeout(rt_expires)) { 1897 /* not infinity */ 1898 flags |= RTF_EXPIRES; 1899 expires = jiffies_to_clock_t(rt_expires); 1900 } 1901 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1902 dev, expires, flags); 1903 } 1904 if (rt) 1905 dst_release(&rt->dst); 1906 } 1907 1908 /* Try to figure out our local address for this prefix */ 1909 1910 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1911 struct inet6_ifaddr * ifp; 1912 struct in6_addr addr; 1913 int create = 0, update_lft = 0; 1914 1915 if (pinfo->prefix_len == 64) { 1916 memcpy(&addr, &pinfo->prefix, 8); 1917 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1918 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1919 in6_dev_put(in6_dev); 1920 return; 1921 } 1922 goto ok; 1923 } 1924 if (net_ratelimit()) 1925 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1926 pinfo->prefix_len); 1927 in6_dev_put(in6_dev); 1928 return; 1929 1930 ok: 1931 1932 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1933 1934 if (ifp == NULL && valid_lft) { 1935 int max_addresses = in6_dev->cnf.max_addresses; 1936 u32 addr_flags = 0; 1937 1938 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1939 if (in6_dev->cnf.optimistic_dad && 1940 !net->ipv6.devconf_all->forwarding && sllao) 1941 addr_flags = IFA_F_OPTIMISTIC; 1942 #endif 1943 1944 /* Do not allow to create too much of autoconfigured 1945 * addresses; this would be too easy way to crash kernel. 1946 */ 1947 if (!max_addresses || 1948 ipv6_count_addresses(in6_dev) < max_addresses) 1949 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1950 addr_type&IPV6_ADDR_SCOPE_MASK, 1951 addr_flags); 1952 1953 if (!ifp || IS_ERR(ifp)) { 1954 in6_dev_put(in6_dev); 1955 return; 1956 } 1957 1958 update_lft = create = 1; 1959 ifp->cstamp = jiffies; 1960 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1961 } 1962 1963 if (ifp) { 1964 int flags; 1965 unsigned long now; 1966 #ifdef CONFIG_IPV6_PRIVACY 1967 struct inet6_ifaddr *ift; 1968 #endif 1969 u32 stored_lft; 1970 1971 /* update lifetime (RFC2462 5.5.3 e) */ 1972 spin_lock(&ifp->lock); 1973 now = jiffies; 1974 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1975 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1976 else 1977 stored_lft = 0; 1978 if (!update_lft && stored_lft) { 1979 if (valid_lft > MIN_VALID_LIFETIME || 1980 valid_lft > stored_lft) 1981 update_lft = 1; 1982 else if (stored_lft <= MIN_VALID_LIFETIME) { 1983 /* valid_lft <= stored_lft is always true */ 1984 /* 1985 * RFC 4862 Section 5.5.3e: 1986 * "Note that the preferred lifetime of 1987 * the corresponding address is always 1988 * reset to the Preferred Lifetime in 1989 * the received Prefix Information 1990 * option, regardless of whether the 1991 * valid lifetime is also reset or 1992 * ignored." 1993 * 1994 * So if the preferred lifetime in 1995 * this advertisement is different 1996 * than what we have stored, but the 1997 * valid lifetime is invalid, just 1998 * reset prefered_lft. 1999 * 2000 * We must set the valid lifetime 2001 * to the stored lifetime since we'll 2002 * be updating the timestamp below, 2003 * else we'll set it back to the 2004 * minimum. 2005 */ 2006 if (prefered_lft != ifp->prefered_lft) { 2007 valid_lft = stored_lft; 2008 update_lft = 1; 2009 } 2010 } else { 2011 valid_lft = MIN_VALID_LIFETIME; 2012 if (valid_lft < prefered_lft) 2013 prefered_lft = valid_lft; 2014 update_lft = 1; 2015 } 2016 } 2017 2018 if (update_lft) { 2019 ifp->valid_lft = valid_lft; 2020 ifp->prefered_lft = prefered_lft; 2021 ifp->tstamp = now; 2022 flags = ifp->flags; 2023 ifp->flags &= ~IFA_F_DEPRECATED; 2024 spin_unlock(&ifp->lock); 2025 2026 if (!(flags&IFA_F_TENTATIVE)) 2027 ipv6_ifa_notify(0, ifp); 2028 } else 2029 spin_unlock(&ifp->lock); 2030 2031 #ifdef CONFIG_IPV6_PRIVACY 2032 read_lock_bh(&in6_dev->lock); 2033 /* update all temporary addresses in the list */ 2034 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2035 tmp_list) { 2036 int age, max_valid, max_prefered; 2037 2038 if (ifp != ift->ifpub) 2039 continue; 2040 2041 /* 2042 * RFC 4941 section 3.3: 2043 * If a received option will extend the lifetime 2044 * of a public address, the lifetimes of 2045 * temporary addresses should be extended, 2046 * subject to the overall constraint that no 2047 * temporary addresses should ever remain 2048 * "valid" or "preferred" for a time longer than 2049 * (TEMP_VALID_LIFETIME) or 2050 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2051 * respectively. 2052 */ 2053 age = (now - ift->cstamp) / HZ; 2054 max_valid = in6_dev->cnf.temp_valid_lft - age; 2055 if (max_valid < 0) 2056 max_valid = 0; 2057 2058 max_prefered = in6_dev->cnf.temp_prefered_lft - 2059 in6_dev->cnf.max_desync_factor - 2060 age; 2061 if (max_prefered < 0) 2062 max_prefered = 0; 2063 2064 if (valid_lft > max_valid) 2065 valid_lft = max_valid; 2066 2067 if (prefered_lft > max_prefered) 2068 prefered_lft = max_prefered; 2069 2070 spin_lock(&ift->lock); 2071 flags = ift->flags; 2072 ift->valid_lft = valid_lft; 2073 ift->prefered_lft = prefered_lft; 2074 ift->tstamp = now; 2075 if (prefered_lft > 0) 2076 ift->flags &= ~IFA_F_DEPRECATED; 2077 2078 spin_unlock(&ift->lock); 2079 if (!(flags&IFA_F_TENTATIVE)) 2080 ipv6_ifa_notify(0, ift); 2081 } 2082 2083 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2084 /* 2085 * When a new public address is created as 2086 * described in [ADDRCONF], also create a new 2087 * temporary address. Also create a temporary 2088 * address if it's enabled but no temporary 2089 * address currently exists. 2090 */ 2091 read_unlock_bh(&in6_dev->lock); 2092 ipv6_create_tempaddr(ifp, NULL); 2093 } else { 2094 read_unlock_bh(&in6_dev->lock); 2095 } 2096 #endif 2097 in6_ifa_put(ifp); 2098 addrconf_verify(0); 2099 } 2100 } 2101 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2102 in6_dev_put(in6_dev); 2103 } 2104 2105 /* 2106 * Set destination address. 2107 * Special case for SIT interfaces where we create a new "virtual" 2108 * device. 2109 */ 2110 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2111 { 2112 struct in6_ifreq ireq; 2113 struct net_device *dev; 2114 int err = -EINVAL; 2115 2116 rtnl_lock(); 2117 2118 err = -EFAULT; 2119 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2120 goto err_exit; 2121 2122 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2123 2124 err = -ENODEV; 2125 if (dev == NULL) 2126 goto err_exit; 2127 2128 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2129 if (dev->type == ARPHRD_SIT) { 2130 const struct net_device_ops *ops = dev->netdev_ops; 2131 struct ifreq ifr; 2132 struct ip_tunnel_parm p; 2133 2134 err = -EADDRNOTAVAIL; 2135 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2136 goto err_exit; 2137 2138 memset(&p, 0, sizeof(p)); 2139 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2140 p.iph.saddr = 0; 2141 p.iph.version = 4; 2142 p.iph.ihl = 5; 2143 p.iph.protocol = IPPROTO_IPV6; 2144 p.iph.ttl = 64; 2145 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2146 2147 if (ops->ndo_do_ioctl) { 2148 mm_segment_t oldfs = get_fs(); 2149 2150 set_fs(KERNEL_DS); 2151 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2152 set_fs(oldfs); 2153 } else 2154 err = -EOPNOTSUPP; 2155 2156 if (err == 0) { 2157 err = -ENOBUFS; 2158 dev = __dev_get_by_name(net, p.name); 2159 if (!dev) 2160 goto err_exit; 2161 err = dev_open(dev); 2162 } 2163 } 2164 #endif 2165 2166 err_exit: 2167 rtnl_unlock(); 2168 return err; 2169 } 2170 2171 /* 2172 * Manual configuration of address on an interface 2173 */ 2174 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2175 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2176 __u32 valid_lft) 2177 { 2178 struct inet6_ifaddr *ifp; 2179 struct inet6_dev *idev; 2180 struct net_device *dev; 2181 int scope; 2182 u32 flags; 2183 clock_t expires; 2184 unsigned long timeout; 2185 2186 ASSERT_RTNL(); 2187 2188 if (plen > 128) 2189 return -EINVAL; 2190 2191 /* check the lifetime */ 2192 if (!valid_lft || prefered_lft > valid_lft) 2193 return -EINVAL; 2194 2195 dev = __dev_get_by_index(net, ifindex); 2196 if (!dev) 2197 return -ENODEV; 2198 2199 idev = addrconf_add_dev(dev); 2200 if (IS_ERR(idev)) 2201 return PTR_ERR(idev); 2202 2203 scope = ipv6_addr_scope(pfx); 2204 2205 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2206 if (addrconf_finite_timeout(timeout)) { 2207 expires = jiffies_to_clock_t(timeout * HZ); 2208 valid_lft = timeout; 2209 flags = RTF_EXPIRES; 2210 } else { 2211 expires = 0; 2212 flags = 0; 2213 ifa_flags |= IFA_F_PERMANENT; 2214 } 2215 2216 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2217 if (addrconf_finite_timeout(timeout)) { 2218 if (timeout == 0) 2219 ifa_flags |= IFA_F_DEPRECATED; 2220 prefered_lft = timeout; 2221 } 2222 2223 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2224 2225 if (!IS_ERR(ifp)) { 2226 spin_lock_bh(&ifp->lock); 2227 ifp->valid_lft = valid_lft; 2228 ifp->prefered_lft = prefered_lft; 2229 ifp->tstamp = jiffies; 2230 spin_unlock_bh(&ifp->lock); 2231 2232 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2233 expires, flags); 2234 /* 2235 * Note that section 3.1 of RFC 4429 indicates 2236 * that the Optimistic flag should not be set for 2237 * manually configured addresses 2238 */ 2239 addrconf_dad_start(ifp, 0); 2240 in6_ifa_put(ifp); 2241 addrconf_verify(0); 2242 return 0; 2243 } 2244 2245 return PTR_ERR(ifp); 2246 } 2247 2248 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2249 unsigned int plen) 2250 { 2251 struct inet6_ifaddr *ifp; 2252 struct inet6_dev *idev; 2253 struct net_device *dev; 2254 2255 if (plen > 128) 2256 return -EINVAL; 2257 2258 dev = __dev_get_by_index(net, ifindex); 2259 if (!dev) 2260 return -ENODEV; 2261 2262 if ((idev = __in6_dev_get(dev)) == NULL) 2263 return -ENXIO; 2264 2265 read_lock_bh(&idev->lock); 2266 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2267 if (ifp->prefix_len == plen && 2268 ipv6_addr_equal(pfx, &ifp->addr)) { 2269 in6_ifa_hold(ifp); 2270 read_unlock_bh(&idev->lock); 2271 2272 ipv6_del_addr(ifp); 2273 2274 /* If the last address is deleted administratively, 2275 disable IPv6 on this interface. 2276 */ 2277 if (list_empty(&idev->addr_list)) 2278 addrconf_ifdown(idev->dev, 1); 2279 return 0; 2280 } 2281 } 2282 read_unlock_bh(&idev->lock); 2283 return -EADDRNOTAVAIL; 2284 } 2285 2286 2287 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2288 { 2289 struct in6_ifreq ireq; 2290 int err; 2291 2292 if (!capable(CAP_NET_ADMIN)) 2293 return -EPERM; 2294 2295 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2296 return -EFAULT; 2297 2298 rtnl_lock(); 2299 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2300 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2301 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2302 rtnl_unlock(); 2303 return err; 2304 } 2305 2306 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2307 { 2308 struct in6_ifreq ireq; 2309 int err; 2310 2311 if (!capable(CAP_NET_ADMIN)) 2312 return -EPERM; 2313 2314 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2315 return -EFAULT; 2316 2317 rtnl_lock(); 2318 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2319 ireq.ifr6_prefixlen); 2320 rtnl_unlock(); 2321 return err; 2322 } 2323 2324 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2325 int plen, int scope) 2326 { 2327 struct inet6_ifaddr *ifp; 2328 2329 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2330 if (!IS_ERR(ifp)) { 2331 spin_lock_bh(&ifp->lock); 2332 ifp->flags &= ~IFA_F_TENTATIVE; 2333 spin_unlock_bh(&ifp->lock); 2334 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2335 in6_ifa_put(ifp); 2336 } 2337 } 2338 2339 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2340 static void sit_add_v4_addrs(struct inet6_dev *idev) 2341 { 2342 struct in6_addr addr; 2343 struct net_device *dev; 2344 struct net *net = dev_net(idev->dev); 2345 int scope; 2346 2347 ASSERT_RTNL(); 2348 2349 memset(&addr, 0, sizeof(struct in6_addr)); 2350 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2351 2352 if (idev->dev->flags&IFF_POINTOPOINT) { 2353 addr.s6_addr32[0] = htonl(0xfe800000); 2354 scope = IFA_LINK; 2355 } else { 2356 scope = IPV6_ADDR_COMPATv4; 2357 } 2358 2359 if (addr.s6_addr32[3]) { 2360 add_addr(idev, &addr, 128, scope); 2361 return; 2362 } 2363 2364 for_each_netdev(net, dev) { 2365 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2366 if (in_dev && (dev->flags & IFF_UP)) { 2367 struct in_ifaddr * ifa; 2368 2369 int flag = scope; 2370 2371 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2372 int plen; 2373 2374 addr.s6_addr32[3] = ifa->ifa_local; 2375 2376 if (ifa->ifa_scope == RT_SCOPE_LINK) 2377 continue; 2378 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2379 if (idev->dev->flags&IFF_POINTOPOINT) 2380 continue; 2381 flag |= IFA_HOST; 2382 } 2383 if (idev->dev->flags&IFF_POINTOPOINT) 2384 plen = 64; 2385 else 2386 plen = 96; 2387 2388 add_addr(idev, &addr, plen, flag); 2389 } 2390 } 2391 } 2392 } 2393 #endif 2394 2395 static void init_loopback(struct net_device *dev) 2396 { 2397 struct inet6_dev *idev; 2398 2399 /* ::1 */ 2400 2401 ASSERT_RTNL(); 2402 2403 if ((idev = ipv6_find_idev(dev)) == NULL) { 2404 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2405 return; 2406 } 2407 2408 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2409 } 2410 2411 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2412 { 2413 struct inet6_ifaddr * ifp; 2414 u32 addr_flags = IFA_F_PERMANENT; 2415 2416 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2417 if (idev->cnf.optimistic_dad && 2418 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2419 addr_flags |= IFA_F_OPTIMISTIC; 2420 #endif 2421 2422 2423 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2424 if (!IS_ERR(ifp)) { 2425 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2426 addrconf_dad_start(ifp, 0); 2427 in6_ifa_put(ifp); 2428 } 2429 } 2430 2431 static void addrconf_dev_config(struct net_device *dev) 2432 { 2433 struct in6_addr addr; 2434 struct inet6_dev * idev; 2435 2436 ASSERT_RTNL(); 2437 2438 if ((dev->type != ARPHRD_ETHER) && 2439 (dev->type != ARPHRD_FDDI) && 2440 (dev->type != ARPHRD_IEEE802_TR) && 2441 (dev->type != ARPHRD_ARCNET) && 2442 (dev->type != ARPHRD_INFINIBAND)) { 2443 /* Alas, we support only Ethernet autoconfiguration. */ 2444 return; 2445 } 2446 2447 idev = addrconf_add_dev(dev); 2448 if (IS_ERR(idev)) 2449 return; 2450 2451 memset(&addr, 0, sizeof(struct in6_addr)); 2452 addr.s6_addr32[0] = htonl(0xFE800000); 2453 2454 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2455 addrconf_add_linklocal(idev, &addr); 2456 } 2457 2458 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2459 static void addrconf_sit_config(struct net_device *dev) 2460 { 2461 struct inet6_dev *idev; 2462 2463 ASSERT_RTNL(); 2464 2465 /* 2466 * Configure the tunnel with one of our IPv4 2467 * addresses... we should configure all of 2468 * our v4 addrs in the tunnel 2469 */ 2470 2471 if ((idev = ipv6_find_idev(dev)) == NULL) { 2472 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2473 return; 2474 } 2475 2476 if (dev->priv_flags & IFF_ISATAP) { 2477 struct in6_addr addr; 2478 2479 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2480 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2481 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2482 addrconf_add_linklocal(idev, &addr); 2483 return; 2484 } 2485 2486 sit_add_v4_addrs(idev); 2487 2488 if (dev->flags&IFF_POINTOPOINT) { 2489 addrconf_add_mroute(dev); 2490 addrconf_add_lroute(dev); 2491 } else 2492 sit_route_add(dev); 2493 } 2494 #endif 2495 2496 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2497 static void addrconf_gre_config(struct net_device *dev) 2498 { 2499 struct inet6_dev *idev; 2500 struct in6_addr addr; 2501 2502 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name); 2503 2504 ASSERT_RTNL(); 2505 2506 if ((idev = ipv6_find_idev(dev)) == NULL) { 2507 printk(KERN_DEBUG "init gre: add_dev failed\n"); 2508 return; 2509 } 2510 2511 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2512 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2513 2514 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2515 addrconf_add_linklocal(idev, &addr); 2516 } 2517 #endif 2518 2519 static inline int 2520 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2521 { 2522 struct in6_addr lladdr; 2523 2524 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2525 addrconf_add_linklocal(idev, &lladdr); 2526 return 0; 2527 } 2528 return -1; 2529 } 2530 2531 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2532 { 2533 struct net_device *link_dev; 2534 struct net *net = dev_net(idev->dev); 2535 2536 /* first try to inherit the link-local address from the link device */ 2537 if (idev->dev->iflink && 2538 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2539 if (!ipv6_inherit_linklocal(idev, link_dev)) 2540 return; 2541 } 2542 /* then try to inherit it from any device */ 2543 for_each_netdev(net, link_dev) { 2544 if (!ipv6_inherit_linklocal(idev, link_dev)) 2545 return; 2546 } 2547 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2548 } 2549 2550 /* 2551 * Autoconfigure tunnel with a link-local address so routing protocols, 2552 * DHCPv6, MLD etc. can be run over the virtual link 2553 */ 2554 2555 static void addrconf_ip6_tnl_config(struct net_device *dev) 2556 { 2557 struct inet6_dev *idev; 2558 2559 ASSERT_RTNL(); 2560 2561 idev = addrconf_add_dev(dev); 2562 if (IS_ERR(idev)) { 2563 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2564 return; 2565 } 2566 ip6_tnl_add_linklocal(idev); 2567 } 2568 2569 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2570 void * data) 2571 { 2572 struct net_device *dev = (struct net_device *) data; 2573 struct inet6_dev *idev = __in6_dev_get(dev); 2574 int run_pending = 0; 2575 int err; 2576 2577 switch (event) { 2578 case NETDEV_REGISTER: 2579 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2580 idev = ipv6_add_dev(dev); 2581 if (!idev) 2582 return notifier_from_errno(-ENOMEM); 2583 } 2584 break; 2585 2586 case NETDEV_UP: 2587 case NETDEV_CHANGE: 2588 if (dev->flags & IFF_SLAVE) 2589 break; 2590 2591 if (event == NETDEV_UP) { 2592 if (!addrconf_qdisc_ok(dev)) { 2593 /* device is not ready yet. */ 2594 printk(KERN_INFO 2595 "ADDRCONF(NETDEV_UP): %s: " 2596 "link is not ready\n", 2597 dev->name); 2598 break; 2599 } 2600 2601 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2602 idev = ipv6_add_dev(dev); 2603 2604 if (idev) { 2605 idev->if_flags |= IF_READY; 2606 run_pending = 1; 2607 } 2608 } else { 2609 if (!addrconf_qdisc_ok(dev)) { 2610 /* device is still not ready. */ 2611 break; 2612 } 2613 2614 if (idev) { 2615 if (idev->if_flags & IF_READY) 2616 /* device is already configured. */ 2617 break; 2618 idev->if_flags |= IF_READY; 2619 } 2620 2621 printk(KERN_INFO 2622 "ADDRCONF(NETDEV_CHANGE): %s: " 2623 "link becomes ready\n", 2624 dev->name); 2625 2626 run_pending = 1; 2627 } 2628 2629 switch (dev->type) { 2630 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2631 case ARPHRD_SIT: 2632 addrconf_sit_config(dev); 2633 break; 2634 #endif 2635 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2636 case ARPHRD_IPGRE: 2637 addrconf_gre_config(dev); 2638 break; 2639 #endif 2640 case ARPHRD_TUNNEL6: 2641 addrconf_ip6_tnl_config(dev); 2642 break; 2643 case ARPHRD_LOOPBACK: 2644 init_loopback(dev); 2645 break; 2646 2647 default: 2648 addrconf_dev_config(dev); 2649 break; 2650 } 2651 2652 if (idev) { 2653 if (run_pending) 2654 addrconf_dad_run(idev); 2655 2656 /* 2657 * If the MTU changed during the interface down, 2658 * when the interface up, the changed MTU must be 2659 * reflected in the idev as well as routers. 2660 */ 2661 if (idev->cnf.mtu6 != dev->mtu && 2662 dev->mtu >= IPV6_MIN_MTU) { 2663 rt6_mtu_change(dev, dev->mtu); 2664 idev->cnf.mtu6 = dev->mtu; 2665 } 2666 idev->tstamp = jiffies; 2667 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2668 2669 /* 2670 * If the changed mtu during down is lower than 2671 * IPV6_MIN_MTU stop IPv6 on this interface. 2672 */ 2673 if (dev->mtu < IPV6_MIN_MTU) 2674 addrconf_ifdown(dev, 1); 2675 } 2676 break; 2677 2678 case NETDEV_CHANGEMTU: 2679 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2680 rt6_mtu_change(dev, dev->mtu); 2681 idev->cnf.mtu6 = dev->mtu; 2682 break; 2683 } 2684 2685 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2686 idev = ipv6_add_dev(dev); 2687 if (idev) 2688 break; 2689 } 2690 2691 /* 2692 * MTU falled under IPV6_MIN_MTU. 2693 * Stop IPv6 on this interface. 2694 */ 2695 2696 case NETDEV_DOWN: 2697 case NETDEV_UNREGISTER: 2698 /* 2699 * Remove all addresses from this interface. 2700 */ 2701 addrconf_ifdown(dev, event != NETDEV_DOWN); 2702 break; 2703 2704 case NETDEV_CHANGENAME: 2705 if (idev) { 2706 snmp6_unregister_dev(idev); 2707 addrconf_sysctl_unregister(idev); 2708 addrconf_sysctl_register(idev); 2709 err = snmp6_register_dev(idev); 2710 if (err) 2711 return notifier_from_errno(err); 2712 } 2713 break; 2714 2715 case NETDEV_PRE_TYPE_CHANGE: 2716 case NETDEV_POST_TYPE_CHANGE: 2717 addrconf_type_change(dev, event); 2718 break; 2719 } 2720 2721 return NOTIFY_OK; 2722 } 2723 2724 /* 2725 * addrconf module should be notified of a device going up 2726 */ 2727 static struct notifier_block ipv6_dev_notf = { 2728 .notifier_call = addrconf_notify, 2729 }; 2730 2731 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2732 { 2733 struct inet6_dev *idev; 2734 ASSERT_RTNL(); 2735 2736 idev = __in6_dev_get(dev); 2737 2738 if (event == NETDEV_POST_TYPE_CHANGE) 2739 ipv6_mc_remap(idev); 2740 else if (event == NETDEV_PRE_TYPE_CHANGE) 2741 ipv6_mc_unmap(idev); 2742 } 2743 2744 static int addrconf_ifdown(struct net_device *dev, int how) 2745 { 2746 struct net *net = dev_net(dev); 2747 struct inet6_dev *idev; 2748 struct inet6_ifaddr *ifa; 2749 int state, i; 2750 2751 ASSERT_RTNL(); 2752 2753 rt6_ifdown(net, dev); 2754 neigh_ifdown(&nd_tbl, dev); 2755 2756 idev = __in6_dev_get(dev); 2757 if (idev == NULL) 2758 return -ENODEV; 2759 2760 /* 2761 * Step 1: remove reference to ipv6 device from parent device. 2762 * Do not dev_put! 2763 */ 2764 if (how) { 2765 idev->dead = 1; 2766 2767 /* protected by rtnl_lock */ 2768 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2769 2770 /* Step 1.5: remove snmp6 entry */ 2771 snmp6_unregister_dev(idev); 2772 2773 } 2774 2775 /* Step 2: clear hash table */ 2776 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2777 struct hlist_head *h = &inet6_addr_lst[i]; 2778 struct hlist_node *n; 2779 2780 spin_lock_bh(&addrconf_hash_lock); 2781 restart: 2782 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2783 if (ifa->idev == idev) { 2784 hlist_del_init_rcu(&ifa->addr_lst); 2785 addrconf_del_timer(ifa); 2786 goto restart; 2787 } 2788 } 2789 spin_unlock_bh(&addrconf_hash_lock); 2790 } 2791 2792 write_lock_bh(&idev->lock); 2793 2794 /* Step 2: clear flags for stateless addrconf */ 2795 if (!how) 2796 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2797 2798 #ifdef CONFIG_IPV6_PRIVACY 2799 if (how && del_timer(&idev->regen_timer)) 2800 in6_dev_put(idev); 2801 2802 /* Step 3: clear tempaddr list */ 2803 while (!list_empty(&idev->tempaddr_list)) { 2804 ifa = list_first_entry(&idev->tempaddr_list, 2805 struct inet6_ifaddr, tmp_list); 2806 list_del(&ifa->tmp_list); 2807 write_unlock_bh(&idev->lock); 2808 spin_lock_bh(&ifa->lock); 2809 2810 if (ifa->ifpub) { 2811 in6_ifa_put(ifa->ifpub); 2812 ifa->ifpub = NULL; 2813 } 2814 spin_unlock_bh(&ifa->lock); 2815 in6_ifa_put(ifa); 2816 write_lock_bh(&idev->lock); 2817 } 2818 #endif 2819 2820 while (!list_empty(&idev->addr_list)) { 2821 ifa = list_first_entry(&idev->addr_list, 2822 struct inet6_ifaddr, if_list); 2823 addrconf_del_timer(ifa); 2824 2825 list_del(&ifa->if_list); 2826 2827 write_unlock_bh(&idev->lock); 2828 2829 spin_lock_bh(&ifa->state_lock); 2830 state = ifa->state; 2831 ifa->state = INET6_IFADDR_STATE_DEAD; 2832 spin_unlock_bh(&ifa->state_lock); 2833 2834 if (state != INET6_IFADDR_STATE_DEAD) { 2835 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2836 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2837 } 2838 in6_ifa_put(ifa); 2839 2840 write_lock_bh(&idev->lock); 2841 } 2842 2843 write_unlock_bh(&idev->lock); 2844 2845 /* Step 5: Discard multicast list */ 2846 if (how) 2847 ipv6_mc_destroy_dev(idev); 2848 else 2849 ipv6_mc_down(idev); 2850 2851 idev->tstamp = jiffies; 2852 2853 /* Last: Shot the device (if unregistered) */ 2854 if (how) { 2855 addrconf_sysctl_unregister(idev); 2856 neigh_parms_release(&nd_tbl, idev->nd_parms); 2857 neigh_ifdown(&nd_tbl, dev); 2858 in6_dev_put(idev); 2859 } 2860 return 0; 2861 } 2862 2863 static void addrconf_rs_timer(unsigned long data) 2864 { 2865 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2866 struct inet6_dev *idev = ifp->idev; 2867 2868 read_lock(&idev->lock); 2869 if (idev->dead || !(idev->if_flags & IF_READY)) 2870 goto out; 2871 2872 if (idev->cnf.forwarding) 2873 goto out; 2874 2875 /* Announcement received after solicitation was sent */ 2876 if (idev->if_flags & IF_RA_RCVD) 2877 goto out; 2878 2879 spin_lock(&ifp->lock); 2880 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2881 /* The wait after the last probe can be shorter */ 2882 addrconf_mod_timer(ifp, AC_RS, 2883 (ifp->probes == idev->cnf.rtr_solicits) ? 2884 idev->cnf.rtr_solicit_delay : 2885 idev->cnf.rtr_solicit_interval); 2886 spin_unlock(&ifp->lock); 2887 2888 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2889 } else { 2890 spin_unlock(&ifp->lock); 2891 /* 2892 * Note: we do not support deprecated "all on-link" 2893 * assumption any longer. 2894 */ 2895 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2896 idev->dev->name); 2897 } 2898 2899 out: 2900 read_unlock(&idev->lock); 2901 in6_ifa_put(ifp); 2902 } 2903 2904 /* 2905 * Duplicate Address Detection 2906 */ 2907 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2908 { 2909 unsigned long rand_num; 2910 struct inet6_dev *idev = ifp->idev; 2911 2912 if (ifp->flags & IFA_F_OPTIMISTIC) 2913 rand_num = 0; 2914 else 2915 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2916 2917 ifp->probes = idev->cnf.dad_transmits; 2918 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2919 } 2920 2921 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2922 { 2923 struct inet6_dev *idev = ifp->idev; 2924 struct net_device *dev = idev->dev; 2925 2926 addrconf_join_solict(dev, &ifp->addr); 2927 2928 net_srandom(ifp->addr.s6_addr32[3]); 2929 2930 read_lock_bh(&idev->lock); 2931 spin_lock(&ifp->lock); 2932 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2933 goto out; 2934 2935 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2936 idev->cnf.accept_dad < 1 || 2937 !(ifp->flags&IFA_F_TENTATIVE) || 2938 ifp->flags & IFA_F_NODAD) { 2939 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2940 spin_unlock(&ifp->lock); 2941 read_unlock_bh(&idev->lock); 2942 2943 addrconf_dad_completed(ifp); 2944 return; 2945 } 2946 2947 if (!(idev->if_flags & IF_READY)) { 2948 spin_unlock(&ifp->lock); 2949 read_unlock_bh(&idev->lock); 2950 /* 2951 * If the device is not ready: 2952 * - keep it tentative if it is a permanent address. 2953 * - otherwise, kill it. 2954 */ 2955 in6_ifa_hold(ifp); 2956 addrconf_dad_stop(ifp, 0); 2957 return; 2958 } 2959 2960 /* 2961 * Optimistic nodes can start receiving 2962 * Frames right away 2963 */ 2964 if (ifp->flags & IFA_F_OPTIMISTIC) 2965 ip6_ins_rt(ifp->rt); 2966 2967 addrconf_dad_kick(ifp); 2968 out: 2969 spin_unlock(&ifp->lock); 2970 read_unlock_bh(&idev->lock); 2971 } 2972 2973 static void addrconf_dad_timer(unsigned long data) 2974 { 2975 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2976 struct inet6_dev *idev = ifp->idev; 2977 struct in6_addr mcaddr; 2978 2979 if (!ifp->probes && addrconf_dad_end(ifp)) 2980 goto out; 2981 2982 read_lock(&idev->lock); 2983 if (idev->dead || !(idev->if_flags & IF_READY)) { 2984 read_unlock(&idev->lock); 2985 goto out; 2986 } 2987 2988 spin_lock(&ifp->lock); 2989 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2990 spin_unlock(&ifp->lock); 2991 read_unlock(&idev->lock); 2992 goto out; 2993 } 2994 2995 if (ifp->probes == 0) { 2996 /* 2997 * DAD was successful 2998 */ 2999 3000 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3001 spin_unlock(&ifp->lock); 3002 read_unlock(&idev->lock); 3003 3004 addrconf_dad_completed(ifp); 3005 3006 goto out; 3007 } 3008 3009 ifp->probes--; 3010 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3011 spin_unlock(&ifp->lock); 3012 read_unlock(&idev->lock); 3013 3014 /* send a neighbour solicitation for our addr */ 3015 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3016 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3017 out: 3018 in6_ifa_put(ifp); 3019 } 3020 3021 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3022 { 3023 struct net_device *dev = ifp->idev->dev; 3024 3025 /* 3026 * Configure the address for reception. Now it is valid. 3027 */ 3028 3029 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3030 3031 /* If added prefix is link local and we are prepared to process 3032 router advertisements, start sending router solicitations. 3033 */ 3034 3035 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) || 3036 ifp->idev->cnf.accept_ra == 2) && 3037 ifp->idev->cnf.rtr_solicits > 0 && 3038 (dev->flags&IFF_LOOPBACK) == 0 && 3039 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3040 /* 3041 * If a host as already performed a random delay 3042 * [...] as part of DAD [...] there is no need 3043 * to delay again before sending the first RS 3044 */ 3045 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3046 3047 spin_lock_bh(&ifp->lock); 3048 ifp->probes = 1; 3049 ifp->idev->if_flags |= IF_RS_SENT; 3050 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3051 spin_unlock_bh(&ifp->lock); 3052 } 3053 } 3054 3055 static void addrconf_dad_run(struct inet6_dev *idev) 3056 { 3057 struct inet6_ifaddr *ifp; 3058 3059 read_lock_bh(&idev->lock); 3060 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3061 spin_lock(&ifp->lock); 3062 if (ifp->flags & IFA_F_TENTATIVE && 3063 ifp->state == INET6_IFADDR_STATE_DAD) 3064 addrconf_dad_kick(ifp); 3065 spin_unlock(&ifp->lock); 3066 } 3067 read_unlock_bh(&idev->lock); 3068 } 3069 3070 #ifdef CONFIG_PROC_FS 3071 struct if6_iter_state { 3072 struct seq_net_private p; 3073 int bucket; 3074 int offset; 3075 }; 3076 3077 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3078 { 3079 struct inet6_ifaddr *ifa = NULL; 3080 struct if6_iter_state *state = seq->private; 3081 struct net *net = seq_file_net(seq); 3082 int p = 0; 3083 3084 /* initial bucket if pos is 0 */ 3085 if (pos == 0) { 3086 state->bucket = 0; 3087 state->offset = 0; 3088 } 3089 3090 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3091 struct hlist_node *n; 3092 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3093 addr_lst) { 3094 /* sync with offset */ 3095 if (p < state->offset) { 3096 p++; 3097 continue; 3098 } 3099 state->offset++; 3100 if (net_eq(dev_net(ifa->idev->dev), net)) 3101 return ifa; 3102 } 3103 3104 /* prepare for next bucket */ 3105 state->offset = 0; 3106 p = 0; 3107 } 3108 return NULL; 3109 } 3110 3111 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3112 struct inet6_ifaddr *ifa) 3113 { 3114 struct if6_iter_state *state = seq->private; 3115 struct net *net = seq_file_net(seq); 3116 struct hlist_node *n = &ifa->addr_lst; 3117 3118 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) { 3119 state->offset++; 3120 if (net_eq(dev_net(ifa->idev->dev), net)) 3121 return ifa; 3122 } 3123 3124 while (++state->bucket < IN6_ADDR_HSIZE) { 3125 state->offset = 0; 3126 hlist_for_each_entry_rcu_bh(ifa, n, 3127 &inet6_addr_lst[state->bucket], addr_lst) { 3128 state->offset++; 3129 if (net_eq(dev_net(ifa->idev->dev), net)) 3130 return ifa; 3131 } 3132 } 3133 3134 return NULL; 3135 } 3136 3137 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3138 __acquires(rcu_bh) 3139 { 3140 rcu_read_lock_bh(); 3141 return if6_get_first(seq, *pos); 3142 } 3143 3144 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3145 { 3146 struct inet6_ifaddr *ifa; 3147 3148 ifa = if6_get_next(seq, v); 3149 ++*pos; 3150 return ifa; 3151 } 3152 3153 static void if6_seq_stop(struct seq_file *seq, void *v) 3154 __releases(rcu_bh) 3155 { 3156 rcu_read_unlock_bh(); 3157 } 3158 3159 static int if6_seq_show(struct seq_file *seq, void *v) 3160 { 3161 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3162 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3163 &ifp->addr, 3164 ifp->idev->dev->ifindex, 3165 ifp->prefix_len, 3166 ifp->scope, 3167 ifp->flags, 3168 ifp->idev->dev->name); 3169 return 0; 3170 } 3171 3172 static const struct seq_operations if6_seq_ops = { 3173 .start = if6_seq_start, 3174 .next = if6_seq_next, 3175 .show = if6_seq_show, 3176 .stop = if6_seq_stop, 3177 }; 3178 3179 static int if6_seq_open(struct inode *inode, struct file *file) 3180 { 3181 return seq_open_net(inode, file, &if6_seq_ops, 3182 sizeof(struct if6_iter_state)); 3183 } 3184 3185 static const struct file_operations if6_fops = { 3186 .owner = THIS_MODULE, 3187 .open = if6_seq_open, 3188 .read = seq_read, 3189 .llseek = seq_lseek, 3190 .release = seq_release_net, 3191 }; 3192 3193 static int __net_init if6_proc_net_init(struct net *net) 3194 { 3195 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3196 return -ENOMEM; 3197 return 0; 3198 } 3199 3200 static void __net_exit if6_proc_net_exit(struct net *net) 3201 { 3202 proc_net_remove(net, "if_inet6"); 3203 } 3204 3205 static struct pernet_operations if6_proc_net_ops = { 3206 .init = if6_proc_net_init, 3207 .exit = if6_proc_net_exit, 3208 }; 3209 3210 int __init if6_proc_init(void) 3211 { 3212 return register_pernet_subsys(&if6_proc_net_ops); 3213 } 3214 3215 void if6_proc_exit(void) 3216 { 3217 unregister_pernet_subsys(&if6_proc_net_ops); 3218 } 3219 #endif /* CONFIG_PROC_FS */ 3220 3221 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3222 /* Check if address is a home address configured on any interface. */ 3223 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3224 { 3225 int ret = 0; 3226 struct inet6_ifaddr *ifp = NULL; 3227 struct hlist_node *n; 3228 unsigned int hash = ipv6_addr_hash(addr); 3229 3230 rcu_read_lock_bh(); 3231 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3232 if (!net_eq(dev_net(ifp->idev->dev), net)) 3233 continue; 3234 if (ipv6_addr_equal(&ifp->addr, addr) && 3235 (ifp->flags & IFA_F_HOMEADDRESS)) { 3236 ret = 1; 3237 break; 3238 } 3239 } 3240 rcu_read_unlock_bh(); 3241 return ret; 3242 } 3243 #endif 3244 3245 /* 3246 * Periodic address status verification 3247 */ 3248 3249 static void addrconf_verify(unsigned long foo) 3250 { 3251 unsigned long now, next, next_sec, next_sched; 3252 struct inet6_ifaddr *ifp; 3253 struct hlist_node *node; 3254 int i; 3255 3256 rcu_read_lock_bh(); 3257 spin_lock(&addrconf_verify_lock); 3258 now = jiffies; 3259 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3260 3261 del_timer(&addr_chk_timer); 3262 3263 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3264 restart: 3265 hlist_for_each_entry_rcu_bh(ifp, node, 3266 &inet6_addr_lst[i], addr_lst) { 3267 unsigned long age; 3268 3269 if (ifp->flags & IFA_F_PERMANENT) 3270 continue; 3271 3272 spin_lock(&ifp->lock); 3273 /* We try to batch several events at once. */ 3274 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3275 3276 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3277 age >= ifp->valid_lft) { 3278 spin_unlock(&ifp->lock); 3279 in6_ifa_hold(ifp); 3280 ipv6_del_addr(ifp); 3281 goto restart; 3282 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3283 spin_unlock(&ifp->lock); 3284 continue; 3285 } else if (age >= ifp->prefered_lft) { 3286 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3287 int deprecate = 0; 3288 3289 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3290 deprecate = 1; 3291 ifp->flags |= IFA_F_DEPRECATED; 3292 } 3293 3294 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3295 next = ifp->tstamp + ifp->valid_lft * HZ; 3296 3297 spin_unlock(&ifp->lock); 3298 3299 if (deprecate) { 3300 in6_ifa_hold(ifp); 3301 3302 ipv6_ifa_notify(0, ifp); 3303 in6_ifa_put(ifp); 3304 goto restart; 3305 } 3306 #ifdef CONFIG_IPV6_PRIVACY 3307 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3308 !(ifp->flags&IFA_F_TENTATIVE)) { 3309 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3310 ifp->idev->cnf.dad_transmits * 3311 ifp->idev->nd_parms->retrans_time / HZ; 3312 3313 if (age >= ifp->prefered_lft - regen_advance) { 3314 struct inet6_ifaddr *ifpub = ifp->ifpub; 3315 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3316 next = ifp->tstamp + ifp->prefered_lft * HZ; 3317 if (!ifp->regen_count && ifpub) { 3318 ifp->regen_count++; 3319 in6_ifa_hold(ifp); 3320 in6_ifa_hold(ifpub); 3321 spin_unlock(&ifp->lock); 3322 3323 spin_lock(&ifpub->lock); 3324 ifpub->regen_count = 0; 3325 spin_unlock(&ifpub->lock); 3326 ipv6_create_tempaddr(ifpub, ifp); 3327 in6_ifa_put(ifpub); 3328 in6_ifa_put(ifp); 3329 goto restart; 3330 } 3331 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3332 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3333 spin_unlock(&ifp->lock); 3334 #endif 3335 } else { 3336 /* ifp->prefered_lft <= ifp->valid_lft */ 3337 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3338 next = ifp->tstamp + ifp->prefered_lft * HZ; 3339 spin_unlock(&ifp->lock); 3340 } 3341 } 3342 } 3343 3344 next_sec = round_jiffies_up(next); 3345 next_sched = next; 3346 3347 /* If rounded timeout is accurate enough, accept it. */ 3348 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3349 next_sched = next_sec; 3350 3351 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3352 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3353 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3354 3355 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3356 now, next, next_sec, next_sched)); 3357 3358 addr_chk_timer.expires = next_sched; 3359 add_timer(&addr_chk_timer); 3360 spin_unlock(&addrconf_verify_lock); 3361 rcu_read_unlock_bh(); 3362 } 3363 3364 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3365 { 3366 struct in6_addr *pfx = NULL; 3367 3368 if (addr) 3369 pfx = nla_data(addr); 3370 3371 if (local) { 3372 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3373 pfx = NULL; 3374 else 3375 pfx = nla_data(local); 3376 } 3377 3378 return pfx; 3379 } 3380 3381 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3382 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3383 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3384 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3385 }; 3386 3387 static int 3388 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3389 { 3390 struct net *net = sock_net(skb->sk); 3391 struct ifaddrmsg *ifm; 3392 struct nlattr *tb[IFA_MAX+1]; 3393 struct in6_addr *pfx; 3394 int err; 3395 3396 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3397 if (err < 0) 3398 return err; 3399 3400 ifm = nlmsg_data(nlh); 3401 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3402 if (pfx == NULL) 3403 return -EINVAL; 3404 3405 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3406 } 3407 3408 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3409 u32 prefered_lft, u32 valid_lft) 3410 { 3411 u32 flags; 3412 clock_t expires; 3413 unsigned long timeout; 3414 3415 if (!valid_lft || (prefered_lft > valid_lft)) 3416 return -EINVAL; 3417 3418 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3419 if (addrconf_finite_timeout(timeout)) { 3420 expires = jiffies_to_clock_t(timeout * HZ); 3421 valid_lft = timeout; 3422 flags = RTF_EXPIRES; 3423 } else { 3424 expires = 0; 3425 flags = 0; 3426 ifa_flags |= IFA_F_PERMANENT; 3427 } 3428 3429 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3430 if (addrconf_finite_timeout(timeout)) { 3431 if (timeout == 0) 3432 ifa_flags |= IFA_F_DEPRECATED; 3433 prefered_lft = timeout; 3434 } 3435 3436 spin_lock_bh(&ifp->lock); 3437 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3438 ifp->tstamp = jiffies; 3439 ifp->valid_lft = valid_lft; 3440 ifp->prefered_lft = prefered_lft; 3441 3442 spin_unlock_bh(&ifp->lock); 3443 if (!(ifp->flags&IFA_F_TENTATIVE)) 3444 ipv6_ifa_notify(0, ifp); 3445 3446 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3447 expires, flags); 3448 addrconf_verify(0); 3449 3450 return 0; 3451 } 3452 3453 static int 3454 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3455 { 3456 struct net *net = sock_net(skb->sk); 3457 struct ifaddrmsg *ifm; 3458 struct nlattr *tb[IFA_MAX+1]; 3459 struct in6_addr *pfx; 3460 struct inet6_ifaddr *ifa; 3461 struct net_device *dev; 3462 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3463 u8 ifa_flags; 3464 int err; 3465 3466 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3467 if (err < 0) 3468 return err; 3469 3470 ifm = nlmsg_data(nlh); 3471 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3472 if (pfx == NULL) 3473 return -EINVAL; 3474 3475 if (tb[IFA_CACHEINFO]) { 3476 struct ifa_cacheinfo *ci; 3477 3478 ci = nla_data(tb[IFA_CACHEINFO]); 3479 valid_lft = ci->ifa_valid; 3480 preferred_lft = ci->ifa_prefered; 3481 } else { 3482 preferred_lft = INFINITY_LIFE_TIME; 3483 valid_lft = INFINITY_LIFE_TIME; 3484 } 3485 3486 dev = __dev_get_by_index(net, ifm->ifa_index); 3487 if (dev == NULL) 3488 return -ENODEV; 3489 3490 /* We ignore other flags so far. */ 3491 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3492 3493 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3494 if (ifa == NULL) { 3495 /* 3496 * It would be best to check for !NLM_F_CREATE here but 3497 * userspace alreay relies on not having to provide this. 3498 */ 3499 return inet6_addr_add(net, ifm->ifa_index, pfx, 3500 ifm->ifa_prefixlen, ifa_flags, 3501 preferred_lft, valid_lft); 3502 } 3503 3504 if (nlh->nlmsg_flags & NLM_F_EXCL || 3505 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3506 err = -EEXIST; 3507 else 3508 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3509 3510 in6_ifa_put(ifa); 3511 3512 return err; 3513 } 3514 3515 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3516 u8 scope, int ifindex) 3517 { 3518 struct ifaddrmsg *ifm; 3519 3520 ifm = nlmsg_data(nlh); 3521 ifm->ifa_family = AF_INET6; 3522 ifm->ifa_prefixlen = prefixlen; 3523 ifm->ifa_flags = flags; 3524 ifm->ifa_scope = scope; 3525 ifm->ifa_index = ifindex; 3526 } 3527 3528 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3529 unsigned long tstamp, u32 preferred, u32 valid) 3530 { 3531 struct ifa_cacheinfo ci; 3532 3533 ci.cstamp = cstamp_delta(cstamp); 3534 ci.tstamp = cstamp_delta(tstamp); 3535 ci.ifa_prefered = preferred; 3536 ci.ifa_valid = valid; 3537 3538 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3539 } 3540 3541 static inline int rt_scope(int ifa_scope) 3542 { 3543 if (ifa_scope & IFA_HOST) 3544 return RT_SCOPE_HOST; 3545 else if (ifa_scope & IFA_LINK) 3546 return RT_SCOPE_LINK; 3547 else if (ifa_scope & IFA_SITE) 3548 return RT_SCOPE_SITE; 3549 else 3550 return RT_SCOPE_UNIVERSE; 3551 } 3552 3553 static inline int inet6_ifaddr_msgsize(void) 3554 { 3555 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3556 + nla_total_size(16) /* IFA_ADDRESS */ 3557 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3558 } 3559 3560 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3561 u32 pid, u32 seq, int event, unsigned int flags) 3562 { 3563 struct nlmsghdr *nlh; 3564 u32 preferred, valid; 3565 3566 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3567 if (nlh == NULL) 3568 return -EMSGSIZE; 3569 3570 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3571 ifa->idev->dev->ifindex); 3572 3573 if (!(ifa->flags&IFA_F_PERMANENT)) { 3574 preferred = ifa->prefered_lft; 3575 valid = ifa->valid_lft; 3576 if (preferred != INFINITY_LIFE_TIME) { 3577 long tval = (jiffies - ifa->tstamp)/HZ; 3578 if (preferred > tval) 3579 preferred -= tval; 3580 else 3581 preferred = 0; 3582 if (valid != INFINITY_LIFE_TIME) { 3583 if (valid > tval) 3584 valid -= tval; 3585 else 3586 valid = 0; 3587 } 3588 } 3589 } else { 3590 preferred = INFINITY_LIFE_TIME; 3591 valid = INFINITY_LIFE_TIME; 3592 } 3593 3594 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3595 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3596 nlmsg_cancel(skb, nlh); 3597 return -EMSGSIZE; 3598 } 3599 3600 return nlmsg_end(skb, nlh); 3601 } 3602 3603 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3604 u32 pid, u32 seq, int event, u16 flags) 3605 { 3606 struct nlmsghdr *nlh; 3607 u8 scope = RT_SCOPE_UNIVERSE; 3608 int ifindex = ifmca->idev->dev->ifindex; 3609 3610 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3611 scope = RT_SCOPE_SITE; 3612 3613 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3614 if (nlh == NULL) 3615 return -EMSGSIZE; 3616 3617 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3618 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3619 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3620 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3621 nlmsg_cancel(skb, nlh); 3622 return -EMSGSIZE; 3623 } 3624 3625 return nlmsg_end(skb, nlh); 3626 } 3627 3628 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3629 u32 pid, u32 seq, int event, unsigned int flags) 3630 { 3631 struct nlmsghdr *nlh; 3632 u8 scope = RT_SCOPE_UNIVERSE; 3633 int ifindex = ifaca->aca_idev->dev->ifindex; 3634 3635 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3636 scope = RT_SCOPE_SITE; 3637 3638 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3639 if (nlh == NULL) 3640 return -EMSGSIZE; 3641 3642 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3643 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3644 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3645 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3646 nlmsg_cancel(skb, nlh); 3647 return -EMSGSIZE; 3648 } 3649 3650 return nlmsg_end(skb, nlh); 3651 } 3652 3653 enum addr_type_t { 3654 UNICAST_ADDR, 3655 MULTICAST_ADDR, 3656 ANYCAST_ADDR, 3657 }; 3658 3659 /* called with rcu_read_lock() */ 3660 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3661 struct netlink_callback *cb, enum addr_type_t type, 3662 int s_ip_idx, int *p_ip_idx) 3663 { 3664 struct ifmcaddr6 *ifmca; 3665 struct ifacaddr6 *ifaca; 3666 int err = 1; 3667 int ip_idx = *p_ip_idx; 3668 3669 read_lock_bh(&idev->lock); 3670 switch (type) { 3671 case UNICAST_ADDR: { 3672 struct inet6_ifaddr *ifa; 3673 3674 /* unicast address incl. temp addr */ 3675 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3676 if (++ip_idx < s_ip_idx) 3677 continue; 3678 err = inet6_fill_ifaddr(skb, ifa, 3679 NETLINK_CB(cb->skb).pid, 3680 cb->nlh->nlmsg_seq, 3681 RTM_NEWADDR, 3682 NLM_F_MULTI); 3683 if (err <= 0) 3684 break; 3685 } 3686 break; 3687 } 3688 case MULTICAST_ADDR: 3689 /* multicast address */ 3690 for (ifmca = idev->mc_list; ifmca; 3691 ifmca = ifmca->next, ip_idx++) { 3692 if (ip_idx < s_ip_idx) 3693 continue; 3694 err = inet6_fill_ifmcaddr(skb, ifmca, 3695 NETLINK_CB(cb->skb).pid, 3696 cb->nlh->nlmsg_seq, 3697 RTM_GETMULTICAST, 3698 NLM_F_MULTI); 3699 if (err <= 0) 3700 break; 3701 } 3702 break; 3703 case ANYCAST_ADDR: 3704 /* anycast address */ 3705 for (ifaca = idev->ac_list; ifaca; 3706 ifaca = ifaca->aca_next, ip_idx++) { 3707 if (ip_idx < s_ip_idx) 3708 continue; 3709 err = inet6_fill_ifacaddr(skb, ifaca, 3710 NETLINK_CB(cb->skb).pid, 3711 cb->nlh->nlmsg_seq, 3712 RTM_GETANYCAST, 3713 NLM_F_MULTI); 3714 if (err <= 0) 3715 break; 3716 } 3717 break; 3718 default: 3719 break; 3720 } 3721 read_unlock_bh(&idev->lock); 3722 *p_ip_idx = ip_idx; 3723 return err; 3724 } 3725 3726 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3727 enum addr_type_t type) 3728 { 3729 struct net *net = sock_net(skb->sk); 3730 int h, s_h; 3731 int idx, ip_idx; 3732 int s_idx, s_ip_idx; 3733 struct net_device *dev; 3734 struct inet6_dev *idev; 3735 struct hlist_head *head; 3736 struct hlist_node *node; 3737 3738 s_h = cb->args[0]; 3739 s_idx = idx = cb->args[1]; 3740 s_ip_idx = ip_idx = cb->args[2]; 3741 3742 rcu_read_lock(); 3743 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3744 idx = 0; 3745 head = &net->dev_index_head[h]; 3746 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3747 if (idx < s_idx) 3748 goto cont; 3749 if (h > s_h || idx > s_idx) 3750 s_ip_idx = 0; 3751 ip_idx = 0; 3752 idev = __in6_dev_get(dev); 3753 if (!idev) 3754 goto cont; 3755 3756 if (in6_dump_addrs(idev, skb, cb, type, 3757 s_ip_idx, &ip_idx) <= 0) 3758 goto done; 3759 cont: 3760 idx++; 3761 } 3762 } 3763 done: 3764 rcu_read_unlock(); 3765 cb->args[0] = h; 3766 cb->args[1] = idx; 3767 cb->args[2] = ip_idx; 3768 3769 return skb->len; 3770 } 3771 3772 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3773 { 3774 enum addr_type_t type = UNICAST_ADDR; 3775 3776 return inet6_dump_addr(skb, cb, type); 3777 } 3778 3779 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3780 { 3781 enum addr_type_t type = MULTICAST_ADDR; 3782 3783 return inet6_dump_addr(skb, cb, type); 3784 } 3785 3786 3787 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3788 { 3789 enum addr_type_t type = ANYCAST_ADDR; 3790 3791 return inet6_dump_addr(skb, cb, type); 3792 } 3793 3794 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3795 void *arg) 3796 { 3797 struct net *net = sock_net(in_skb->sk); 3798 struct ifaddrmsg *ifm; 3799 struct nlattr *tb[IFA_MAX+1]; 3800 struct in6_addr *addr = NULL; 3801 struct net_device *dev = NULL; 3802 struct inet6_ifaddr *ifa; 3803 struct sk_buff *skb; 3804 int err; 3805 3806 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3807 if (err < 0) 3808 goto errout; 3809 3810 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3811 if (addr == NULL) { 3812 err = -EINVAL; 3813 goto errout; 3814 } 3815 3816 ifm = nlmsg_data(nlh); 3817 if (ifm->ifa_index) 3818 dev = __dev_get_by_index(net, ifm->ifa_index); 3819 3820 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3821 if (!ifa) { 3822 err = -EADDRNOTAVAIL; 3823 goto errout; 3824 } 3825 3826 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3827 if (!skb) { 3828 err = -ENOBUFS; 3829 goto errout_ifa; 3830 } 3831 3832 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3833 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3834 if (err < 0) { 3835 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3836 WARN_ON(err == -EMSGSIZE); 3837 kfree_skb(skb); 3838 goto errout_ifa; 3839 } 3840 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3841 errout_ifa: 3842 in6_ifa_put(ifa); 3843 errout: 3844 return err; 3845 } 3846 3847 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3848 { 3849 struct sk_buff *skb; 3850 struct net *net = dev_net(ifa->idev->dev); 3851 int err = -ENOBUFS; 3852 3853 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3854 if (skb == NULL) 3855 goto errout; 3856 3857 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3858 if (err < 0) { 3859 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3860 WARN_ON(err == -EMSGSIZE); 3861 kfree_skb(skb); 3862 goto errout; 3863 } 3864 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3865 return; 3866 errout: 3867 if (err < 0) 3868 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3869 } 3870 3871 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3872 __s32 *array, int bytes) 3873 { 3874 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3875 3876 memset(array, 0, bytes); 3877 array[DEVCONF_FORWARDING] = cnf->forwarding; 3878 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3879 array[DEVCONF_MTU6] = cnf->mtu6; 3880 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3881 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3882 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3883 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3884 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3885 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3886 jiffies_to_msecs(cnf->rtr_solicit_interval); 3887 array[DEVCONF_RTR_SOLICIT_DELAY] = 3888 jiffies_to_msecs(cnf->rtr_solicit_delay); 3889 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3890 #ifdef CONFIG_IPV6_PRIVACY 3891 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3892 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3893 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3894 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3895 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3896 #endif 3897 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3898 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3899 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3900 #ifdef CONFIG_IPV6_ROUTER_PREF 3901 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3902 array[DEVCONF_RTR_PROBE_INTERVAL] = 3903 jiffies_to_msecs(cnf->rtr_probe_interval); 3904 #ifdef CONFIG_IPV6_ROUTE_INFO 3905 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3906 #endif 3907 #endif 3908 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3909 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3910 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3911 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3912 #endif 3913 #ifdef CONFIG_IPV6_MROUTE 3914 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3915 #endif 3916 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3917 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3918 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3919 } 3920 3921 static inline size_t inet6_ifla6_size(void) 3922 { 3923 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3924 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3925 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3926 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3927 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3928 } 3929 3930 static inline size_t inet6_if_nlmsg_size(void) 3931 { 3932 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3933 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3934 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3935 + nla_total_size(4) /* IFLA_MTU */ 3936 + nla_total_size(4) /* IFLA_LINK */ 3937 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3938 } 3939 3940 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3941 int items, int bytes) 3942 { 3943 int i; 3944 int pad = bytes - sizeof(u64) * items; 3945 BUG_ON(pad < 0); 3946 3947 /* Use put_unaligned() because stats may not be aligned for u64. */ 3948 put_unaligned(items, &stats[0]); 3949 for (i = 1; i < items; i++) 3950 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3951 3952 memset(&stats[items], 0, pad); 3953 } 3954 3955 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3956 int items, int bytes, size_t syncpoff) 3957 { 3958 int i; 3959 int pad = bytes - sizeof(u64) * items; 3960 BUG_ON(pad < 0); 3961 3962 /* Use put_unaligned() because stats may not be aligned for u64. */ 3963 put_unaligned(items, &stats[0]); 3964 for (i = 1; i < items; i++) 3965 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3966 3967 memset(&stats[items], 0, pad); 3968 } 3969 3970 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3971 int bytes) 3972 { 3973 switch (attrtype) { 3974 case IFLA_INET6_STATS: 3975 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3976 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3977 break; 3978 case IFLA_INET6_ICMP6STATS: 3979 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3980 break; 3981 } 3982 } 3983 3984 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3985 { 3986 struct nlattr *nla; 3987 struct ifla_cacheinfo ci; 3988 3989 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3990 3991 ci.max_reasm_len = IPV6_MAXPLEN; 3992 ci.tstamp = cstamp_delta(idev->tstamp); 3993 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3994 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3995 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3996 3997 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3998 if (nla == NULL) 3999 goto nla_put_failure; 4000 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4001 4002 /* XXX - MC not implemented */ 4003 4004 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4005 if (nla == NULL) 4006 goto nla_put_failure; 4007 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4008 4009 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4010 if (nla == NULL) 4011 goto nla_put_failure; 4012 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4013 4014 return 0; 4015 4016 nla_put_failure: 4017 return -EMSGSIZE; 4018 } 4019 4020 static size_t inet6_get_link_af_size(const struct net_device *dev) 4021 { 4022 if (!__in6_dev_get(dev)) 4023 return 0; 4024 4025 return inet6_ifla6_size(); 4026 } 4027 4028 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4029 { 4030 struct inet6_dev *idev = __in6_dev_get(dev); 4031 4032 if (!idev) 4033 return -ENODATA; 4034 4035 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4036 return -EMSGSIZE; 4037 4038 return 0; 4039 } 4040 4041 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4042 u32 pid, u32 seq, int event, unsigned int flags) 4043 { 4044 struct net_device *dev = idev->dev; 4045 struct ifinfomsg *hdr; 4046 struct nlmsghdr *nlh; 4047 void *protoinfo; 4048 4049 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 4050 if (nlh == NULL) 4051 return -EMSGSIZE; 4052 4053 hdr = nlmsg_data(nlh); 4054 hdr->ifi_family = AF_INET6; 4055 hdr->__ifi_pad = 0; 4056 hdr->ifi_type = dev->type; 4057 hdr->ifi_index = dev->ifindex; 4058 hdr->ifi_flags = dev_get_flags(dev); 4059 hdr->ifi_change = 0; 4060 4061 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 4062 4063 if (dev->addr_len) 4064 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 4065 4066 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 4067 if (dev->ifindex != dev->iflink) 4068 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 4069 4070 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4071 if (protoinfo == NULL) 4072 goto nla_put_failure; 4073 4074 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4075 goto nla_put_failure; 4076 4077 nla_nest_end(skb, protoinfo); 4078 return nlmsg_end(skb, nlh); 4079 4080 nla_put_failure: 4081 nlmsg_cancel(skb, nlh); 4082 return -EMSGSIZE; 4083 } 4084 4085 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4086 { 4087 struct net *net = sock_net(skb->sk); 4088 int h, s_h; 4089 int idx = 0, s_idx; 4090 struct net_device *dev; 4091 struct inet6_dev *idev; 4092 struct hlist_head *head; 4093 struct hlist_node *node; 4094 4095 s_h = cb->args[0]; 4096 s_idx = cb->args[1]; 4097 4098 rcu_read_lock(); 4099 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4100 idx = 0; 4101 head = &net->dev_index_head[h]; 4102 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4103 if (idx < s_idx) 4104 goto cont; 4105 idev = __in6_dev_get(dev); 4106 if (!idev) 4107 goto cont; 4108 if (inet6_fill_ifinfo(skb, idev, 4109 NETLINK_CB(cb->skb).pid, 4110 cb->nlh->nlmsg_seq, 4111 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4112 goto out; 4113 cont: 4114 idx++; 4115 } 4116 } 4117 out: 4118 rcu_read_unlock(); 4119 cb->args[1] = idx; 4120 cb->args[0] = h; 4121 4122 return skb->len; 4123 } 4124 4125 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4126 { 4127 struct sk_buff *skb; 4128 struct net *net = dev_net(idev->dev); 4129 int err = -ENOBUFS; 4130 4131 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4132 if (skb == NULL) 4133 goto errout; 4134 4135 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4136 if (err < 0) { 4137 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4138 WARN_ON(err == -EMSGSIZE); 4139 kfree_skb(skb); 4140 goto errout; 4141 } 4142 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4143 return; 4144 errout: 4145 if (err < 0) 4146 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4147 } 4148 4149 static inline size_t inet6_prefix_nlmsg_size(void) 4150 { 4151 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4152 + nla_total_size(sizeof(struct in6_addr)) 4153 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4154 } 4155 4156 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4157 struct prefix_info *pinfo, u32 pid, u32 seq, 4158 int event, unsigned int flags) 4159 { 4160 struct prefixmsg *pmsg; 4161 struct nlmsghdr *nlh; 4162 struct prefix_cacheinfo ci; 4163 4164 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4165 if (nlh == NULL) 4166 return -EMSGSIZE; 4167 4168 pmsg = nlmsg_data(nlh); 4169 pmsg->prefix_family = AF_INET6; 4170 pmsg->prefix_pad1 = 0; 4171 pmsg->prefix_pad2 = 0; 4172 pmsg->prefix_ifindex = idev->dev->ifindex; 4173 pmsg->prefix_len = pinfo->prefix_len; 4174 pmsg->prefix_type = pinfo->type; 4175 pmsg->prefix_pad3 = 0; 4176 pmsg->prefix_flags = 0; 4177 if (pinfo->onlink) 4178 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4179 if (pinfo->autoconf) 4180 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4181 4182 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4183 4184 ci.preferred_time = ntohl(pinfo->prefered); 4185 ci.valid_time = ntohl(pinfo->valid); 4186 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4187 4188 return nlmsg_end(skb, nlh); 4189 4190 nla_put_failure: 4191 nlmsg_cancel(skb, nlh); 4192 return -EMSGSIZE; 4193 } 4194 4195 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4196 struct prefix_info *pinfo) 4197 { 4198 struct sk_buff *skb; 4199 struct net *net = dev_net(idev->dev); 4200 int err = -ENOBUFS; 4201 4202 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4203 if (skb == NULL) 4204 goto errout; 4205 4206 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4207 if (err < 0) { 4208 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4209 WARN_ON(err == -EMSGSIZE); 4210 kfree_skb(skb); 4211 goto errout; 4212 } 4213 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4214 return; 4215 errout: 4216 if (err < 0) 4217 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4218 } 4219 4220 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4221 { 4222 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4223 4224 switch (event) { 4225 case RTM_NEWADDR: 4226 /* 4227 * If the address was optimistic 4228 * we inserted the route at the start of 4229 * our DAD process, so we don't need 4230 * to do it again 4231 */ 4232 if (!(ifp->rt->rt6i_node)) 4233 ip6_ins_rt(ifp->rt); 4234 if (ifp->idev->cnf.forwarding) 4235 addrconf_join_anycast(ifp); 4236 break; 4237 case RTM_DELADDR: 4238 if (ifp->idev->cnf.forwarding) 4239 addrconf_leave_anycast(ifp); 4240 addrconf_leave_solict(ifp->idev, &ifp->addr); 4241 dst_hold(&ifp->rt->dst); 4242 4243 if (ip6_del_rt(ifp->rt)) 4244 dst_free(&ifp->rt->dst); 4245 break; 4246 } 4247 } 4248 4249 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4250 { 4251 rcu_read_lock_bh(); 4252 if (likely(ifp->idev->dead == 0)) 4253 __ipv6_ifa_notify(event, ifp); 4254 rcu_read_unlock_bh(); 4255 } 4256 4257 #ifdef CONFIG_SYSCTL 4258 4259 static 4260 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4261 void __user *buffer, size_t *lenp, loff_t *ppos) 4262 { 4263 int *valp = ctl->data; 4264 int val = *valp; 4265 loff_t pos = *ppos; 4266 ctl_table lctl; 4267 int ret; 4268 4269 /* 4270 * ctl->data points to idev->cnf.forwarding, we should 4271 * not modify it until we get the rtnl lock. 4272 */ 4273 lctl = *ctl; 4274 lctl.data = &val; 4275 4276 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4277 4278 if (write) 4279 ret = addrconf_fixup_forwarding(ctl, valp, val); 4280 if (ret) 4281 *ppos = pos; 4282 return ret; 4283 } 4284 4285 static void dev_disable_change(struct inet6_dev *idev) 4286 { 4287 if (!idev || !idev->dev) 4288 return; 4289 4290 if (idev->cnf.disable_ipv6) 4291 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4292 else 4293 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4294 } 4295 4296 static void addrconf_disable_change(struct net *net, __s32 newf) 4297 { 4298 struct net_device *dev; 4299 struct inet6_dev *idev; 4300 4301 rcu_read_lock(); 4302 for_each_netdev_rcu(net, dev) { 4303 idev = __in6_dev_get(dev); 4304 if (idev) { 4305 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4306 idev->cnf.disable_ipv6 = newf; 4307 if (changed) 4308 dev_disable_change(idev); 4309 } 4310 } 4311 rcu_read_unlock(); 4312 } 4313 4314 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4315 { 4316 struct net *net; 4317 int old; 4318 4319 if (!rtnl_trylock()) 4320 return restart_syscall(); 4321 4322 net = (struct net *)table->extra2; 4323 old = *p; 4324 *p = newf; 4325 4326 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4327 rtnl_unlock(); 4328 return 0; 4329 } 4330 4331 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4332 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4333 addrconf_disable_change(net, newf); 4334 } else if ((!newf) ^ (!old)) 4335 dev_disable_change((struct inet6_dev *)table->extra1); 4336 4337 rtnl_unlock(); 4338 return 0; 4339 } 4340 4341 static 4342 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4343 void __user *buffer, size_t *lenp, loff_t *ppos) 4344 { 4345 int *valp = ctl->data; 4346 int val = *valp; 4347 loff_t pos = *ppos; 4348 ctl_table lctl; 4349 int ret; 4350 4351 /* 4352 * ctl->data points to idev->cnf.disable_ipv6, we should 4353 * not modify it until we get the rtnl lock. 4354 */ 4355 lctl = *ctl; 4356 lctl.data = &val; 4357 4358 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4359 4360 if (write) 4361 ret = addrconf_disable_ipv6(ctl, valp, val); 4362 if (ret) 4363 *ppos = pos; 4364 return ret; 4365 } 4366 4367 static struct addrconf_sysctl_table 4368 { 4369 struct ctl_table_header *sysctl_header; 4370 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4371 char *dev_name; 4372 } addrconf_sysctl __read_mostly = { 4373 .sysctl_header = NULL, 4374 .addrconf_vars = { 4375 { 4376 .procname = "forwarding", 4377 .data = &ipv6_devconf.forwarding, 4378 .maxlen = sizeof(int), 4379 .mode = 0644, 4380 .proc_handler = addrconf_sysctl_forward, 4381 }, 4382 { 4383 .procname = "hop_limit", 4384 .data = &ipv6_devconf.hop_limit, 4385 .maxlen = sizeof(int), 4386 .mode = 0644, 4387 .proc_handler = proc_dointvec, 4388 }, 4389 { 4390 .procname = "mtu", 4391 .data = &ipv6_devconf.mtu6, 4392 .maxlen = sizeof(int), 4393 .mode = 0644, 4394 .proc_handler = proc_dointvec, 4395 }, 4396 { 4397 .procname = "accept_ra", 4398 .data = &ipv6_devconf.accept_ra, 4399 .maxlen = sizeof(int), 4400 .mode = 0644, 4401 .proc_handler = proc_dointvec, 4402 }, 4403 { 4404 .procname = "accept_redirects", 4405 .data = &ipv6_devconf.accept_redirects, 4406 .maxlen = sizeof(int), 4407 .mode = 0644, 4408 .proc_handler = proc_dointvec, 4409 }, 4410 { 4411 .procname = "autoconf", 4412 .data = &ipv6_devconf.autoconf, 4413 .maxlen = sizeof(int), 4414 .mode = 0644, 4415 .proc_handler = proc_dointvec, 4416 }, 4417 { 4418 .procname = "dad_transmits", 4419 .data = &ipv6_devconf.dad_transmits, 4420 .maxlen = sizeof(int), 4421 .mode = 0644, 4422 .proc_handler = proc_dointvec, 4423 }, 4424 { 4425 .procname = "router_solicitations", 4426 .data = &ipv6_devconf.rtr_solicits, 4427 .maxlen = sizeof(int), 4428 .mode = 0644, 4429 .proc_handler = proc_dointvec, 4430 }, 4431 { 4432 .procname = "router_solicitation_interval", 4433 .data = &ipv6_devconf.rtr_solicit_interval, 4434 .maxlen = sizeof(int), 4435 .mode = 0644, 4436 .proc_handler = proc_dointvec_jiffies, 4437 }, 4438 { 4439 .procname = "router_solicitation_delay", 4440 .data = &ipv6_devconf.rtr_solicit_delay, 4441 .maxlen = sizeof(int), 4442 .mode = 0644, 4443 .proc_handler = proc_dointvec_jiffies, 4444 }, 4445 { 4446 .procname = "force_mld_version", 4447 .data = &ipv6_devconf.force_mld_version, 4448 .maxlen = sizeof(int), 4449 .mode = 0644, 4450 .proc_handler = proc_dointvec, 4451 }, 4452 #ifdef CONFIG_IPV6_PRIVACY 4453 { 4454 .procname = "use_tempaddr", 4455 .data = &ipv6_devconf.use_tempaddr, 4456 .maxlen = sizeof(int), 4457 .mode = 0644, 4458 .proc_handler = proc_dointvec, 4459 }, 4460 { 4461 .procname = "temp_valid_lft", 4462 .data = &ipv6_devconf.temp_valid_lft, 4463 .maxlen = sizeof(int), 4464 .mode = 0644, 4465 .proc_handler = proc_dointvec, 4466 }, 4467 { 4468 .procname = "temp_prefered_lft", 4469 .data = &ipv6_devconf.temp_prefered_lft, 4470 .maxlen = sizeof(int), 4471 .mode = 0644, 4472 .proc_handler = proc_dointvec, 4473 }, 4474 { 4475 .procname = "regen_max_retry", 4476 .data = &ipv6_devconf.regen_max_retry, 4477 .maxlen = sizeof(int), 4478 .mode = 0644, 4479 .proc_handler = proc_dointvec, 4480 }, 4481 { 4482 .procname = "max_desync_factor", 4483 .data = &ipv6_devconf.max_desync_factor, 4484 .maxlen = sizeof(int), 4485 .mode = 0644, 4486 .proc_handler = proc_dointvec, 4487 }, 4488 #endif 4489 { 4490 .procname = "max_addresses", 4491 .data = &ipv6_devconf.max_addresses, 4492 .maxlen = sizeof(int), 4493 .mode = 0644, 4494 .proc_handler = proc_dointvec, 4495 }, 4496 { 4497 .procname = "accept_ra_defrtr", 4498 .data = &ipv6_devconf.accept_ra_defrtr, 4499 .maxlen = sizeof(int), 4500 .mode = 0644, 4501 .proc_handler = proc_dointvec, 4502 }, 4503 { 4504 .procname = "accept_ra_pinfo", 4505 .data = &ipv6_devconf.accept_ra_pinfo, 4506 .maxlen = sizeof(int), 4507 .mode = 0644, 4508 .proc_handler = proc_dointvec, 4509 }, 4510 #ifdef CONFIG_IPV6_ROUTER_PREF 4511 { 4512 .procname = "accept_ra_rtr_pref", 4513 .data = &ipv6_devconf.accept_ra_rtr_pref, 4514 .maxlen = sizeof(int), 4515 .mode = 0644, 4516 .proc_handler = proc_dointvec, 4517 }, 4518 { 4519 .procname = "router_probe_interval", 4520 .data = &ipv6_devconf.rtr_probe_interval, 4521 .maxlen = sizeof(int), 4522 .mode = 0644, 4523 .proc_handler = proc_dointvec_jiffies, 4524 }, 4525 #ifdef CONFIG_IPV6_ROUTE_INFO 4526 { 4527 .procname = "accept_ra_rt_info_max_plen", 4528 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4529 .maxlen = sizeof(int), 4530 .mode = 0644, 4531 .proc_handler = proc_dointvec, 4532 }, 4533 #endif 4534 #endif 4535 { 4536 .procname = "proxy_ndp", 4537 .data = &ipv6_devconf.proxy_ndp, 4538 .maxlen = sizeof(int), 4539 .mode = 0644, 4540 .proc_handler = proc_dointvec, 4541 }, 4542 { 4543 .procname = "accept_source_route", 4544 .data = &ipv6_devconf.accept_source_route, 4545 .maxlen = sizeof(int), 4546 .mode = 0644, 4547 .proc_handler = proc_dointvec, 4548 }, 4549 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4550 { 4551 .procname = "optimistic_dad", 4552 .data = &ipv6_devconf.optimistic_dad, 4553 .maxlen = sizeof(int), 4554 .mode = 0644, 4555 .proc_handler = proc_dointvec, 4556 4557 }, 4558 #endif 4559 #ifdef CONFIG_IPV6_MROUTE 4560 { 4561 .procname = "mc_forwarding", 4562 .data = &ipv6_devconf.mc_forwarding, 4563 .maxlen = sizeof(int), 4564 .mode = 0444, 4565 .proc_handler = proc_dointvec, 4566 }, 4567 #endif 4568 { 4569 .procname = "disable_ipv6", 4570 .data = &ipv6_devconf.disable_ipv6, 4571 .maxlen = sizeof(int), 4572 .mode = 0644, 4573 .proc_handler = addrconf_sysctl_disable, 4574 }, 4575 { 4576 .procname = "accept_dad", 4577 .data = &ipv6_devconf.accept_dad, 4578 .maxlen = sizeof(int), 4579 .mode = 0644, 4580 .proc_handler = proc_dointvec, 4581 }, 4582 { 4583 .procname = "force_tllao", 4584 .data = &ipv6_devconf.force_tllao, 4585 .maxlen = sizeof(int), 4586 .mode = 0644, 4587 .proc_handler = proc_dointvec 4588 }, 4589 { 4590 /* sentinel */ 4591 } 4592 }, 4593 }; 4594 4595 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4596 struct inet6_dev *idev, struct ipv6_devconf *p) 4597 { 4598 int i; 4599 struct addrconf_sysctl_table *t; 4600 4601 #define ADDRCONF_CTL_PATH_DEV 3 4602 4603 struct ctl_path addrconf_ctl_path[] = { 4604 { .procname = "net", }, 4605 { .procname = "ipv6", }, 4606 { .procname = "conf", }, 4607 { /* to be set */ }, 4608 { }, 4609 }; 4610 4611 4612 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4613 if (t == NULL) 4614 goto out; 4615 4616 for (i = 0; t->addrconf_vars[i].data; i++) { 4617 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4618 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4619 t->addrconf_vars[i].extra2 = net; 4620 } 4621 4622 /* 4623 * Make a copy of dev_name, because '.procname' is regarded as const 4624 * by sysctl and we wouldn't want anyone to change it under our feet 4625 * (see SIOCSIFNAME). 4626 */ 4627 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4628 if (!t->dev_name) 4629 goto free; 4630 4631 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4632 4633 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4634 t->addrconf_vars); 4635 if (t->sysctl_header == NULL) 4636 goto free_procname; 4637 4638 p->sysctl = t; 4639 return 0; 4640 4641 free_procname: 4642 kfree(t->dev_name); 4643 free: 4644 kfree(t); 4645 out: 4646 return -ENOBUFS; 4647 } 4648 4649 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4650 { 4651 struct addrconf_sysctl_table *t; 4652 4653 if (p->sysctl == NULL) 4654 return; 4655 4656 t = p->sysctl; 4657 p->sysctl = NULL; 4658 unregister_net_sysctl_table(t->sysctl_header); 4659 kfree(t->dev_name); 4660 kfree(t); 4661 } 4662 4663 static void addrconf_sysctl_register(struct inet6_dev *idev) 4664 { 4665 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4666 &ndisc_ifinfo_sysctl_change); 4667 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4668 idev, &idev->cnf); 4669 } 4670 4671 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4672 { 4673 __addrconf_sysctl_unregister(&idev->cnf); 4674 neigh_sysctl_unregister(idev->nd_parms); 4675 } 4676 4677 4678 #endif 4679 4680 static int __net_init addrconf_init_net(struct net *net) 4681 { 4682 int err; 4683 struct ipv6_devconf *all, *dflt; 4684 4685 err = -ENOMEM; 4686 all = &ipv6_devconf; 4687 dflt = &ipv6_devconf_dflt; 4688 4689 if (!net_eq(net, &init_net)) { 4690 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4691 if (all == NULL) 4692 goto err_alloc_all; 4693 4694 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4695 if (dflt == NULL) 4696 goto err_alloc_dflt; 4697 } else { 4698 /* these will be inherited by all namespaces */ 4699 dflt->autoconf = ipv6_defaults.autoconf; 4700 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4701 } 4702 4703 net->ipv6.devconf_all = all; 4704 net->ipv6.devconf_dflt = dflt; 4705 4706 #ifdef CONFIG_SYSCTL 4707 err = __addrconf_sysctl_register(net, "all", NULL, all); 4708 if (err < 0) 4709 goto err_reg_all; 4710 4711 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4712 if (err < 0) 4713 goto err_reg_dflt; 4714 #endif 4715 return 0; 4716 4717 #ifdef CONFIG_SYSCTL 4718 err_reg_dflt: 4719 __addrconf_sysctl_unregister(all); 4720 err_reg_all: 4721 kfree(dflt); 4722 #endif 4723 err_alloc_dflt: 4724 kfree(all); 4725 err_alloc_all: 4726 return err; 4727 } 4728 4729 static void __net_exit addrconf_exit_net(struct net *net) 4730 { 4731 #ifdef CONFIG_SYSCTL 4732 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4733 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4734 #endif 4735 if (!net_eq(net, &init_net)) { 4736 kfree(net->ipv6.devconf_dflt); 4737 kfree(net->ipv6.devconf_all); 4738 } 4739 } 4740 4741 static struct pernet_operations addrconf_ops = { 4742 .init = addrconf_init_net, 4743 .exit = addrconf_exit_net, 4744 }; 4745 4746 /* 4747 * Device notifier 4748 */ 4749 4750 int register_inet6addr_notifier(struct notifier_block *nb) 4751 { 4752 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4753 } 4754 EXPORT_SYMBOL(register_inet6addr_notifier); 4755 4756 int unregister_inet6addr_notifier(struct notifier_block *nb) 4757 { 4758 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4759 } 4760 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4761 4762 static struct rtnl_af_ops inet6_ops = { 4763 .family = AF_INET6, 4764 .fill_link_af = inet6_fill_link_af, 4765 .get_link_af_size = inet6_get_link_af_size, 4766 }; 4767 4768 /* 4769 * Init / cleanup code 4770 */ 4771 4772 int __init addrconf_init(void) 4773 { 4774 int i, err; 4775 4776 err = ipv6_addr_label_init(); 4777 if (err < 0) { 4778 printk(KERN_CRIT "IPv6 Addrconf:" 4779 " cannot initialize default policy table: %d.\n", err); 4780 goto out; 4781 } 4782 4783 err = register_pernet_subsys(&addrconf_ops); 4784 if (err < 0) 4785 goto out_addrlabel; 4786 4787 /* The addrconf netdev notifier requires that loopback_dev 4788 * has it's ipv6 private information allocated and setup 4789 * before it can bring up and give link-local addresses 4790 * to other devices which are up. 4791 * 4792 * Unfortunately, loopback_dev is not necessarily the first 4793 * entry in the global dev_base list of net devices. In fact, 4794 * it is likely to be the very last entry on that list. 4795 * So this causes the notifier registry below to try and 4796 * give link-local addresses to all devices besides loopback_dev 4797 * first, then loopback_dev, which cases all the non-loopback_dev 4798 * devices to fail to get a link-local address. 4799 * 4800 * So, as a temporary fix, allocate the ipv6 structure for 4801 * loopback_dev first by hand. 4802 * Longer term, all of the dependencies ipv6 has upon the loopback 4803 * device and it being up should be removed. 4804 */ 4805 rtnl_lock(); 4806 if (!ipv6_add_dev(init_net.loopback_dev)) 4807 err = -ENOMEM; 4808 rtnl_unlock(); 4809 if (err) 4810 goto errlo; 4811 4812 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4813 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4814 4815 register_netdevice_notifier(&ipv6_dev_notf); 4816 4817 addrconf_verify(0); 4818 4819 err = rtnl_af_register(&inet6_ops); 4820 if (err < 0) 4821 goto errout_af; 4822 4823 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4824 NULL); 4825 if (err < 0) 4826 goto errout; 4827 4828 /* Only the first call to __rtnl_register can fail */ 4829 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4830 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4831 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4832 inet6_dump_ifaddr, NULL); 4833 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4834 inet6_dump_ifmcaddr, NULL); 4835 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4836 inet6_dump_ifacaddr, NULL); 4837 4838 ipv6_addr_label_rtnl_register(); 4839 4840 return 0; 4841 errout: 4842 rtnl_af_unregister(&inet6_ops); 4843 errout_af: 4844 unregister_netdevice_notifier(&ipv6_dev_notf); 4845 errlo: 4846 unregister_pernet_subsys(&addrconf_ops); 4847 out_addrlabel: 4848 ipv6_addr_label_cleanup(); 4849 out: 4850 return err; 4851 } 4852 4853 void addrconf_cleanup(void) 4854 { 4855 struct net_device *dev; 4856 int i; 4857 4858 unregister_netdevice_notifier(&ipv6_dev_notf); 4859 unregister_pernet_subsys(&addrconf_ops); 4860 ipv6_addr_label_cleanup(); 4861 4862 rtnl_lock(); 4863 4864 __rtnl_af_unregister(&inet6_ops); 4865 4866 /* clean dev list */ 4867 for_each_netdev(&init_net, dev) { 4868 if (__in6_dev_get(dev) == NULL) 4869 continue; 4870 addrconf_ifdown(dev, 1); 4871 } 4872 addrconf_ifdown(init_net.loopback_dev, 2); 4873 4874 /* 4875 * Check hash table. 4876 */ 4877 spin_lock_bh(&addrconf_hash_lock); 4878 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4879 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4880 spin_unlock_bh(&addrconf_hash_lock); 4881 4882 del_timer(&addr_chk_timer); 4883 rtnl_unlock(); 4884 } 4885