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