1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #include <linux/errno.h> 42 #include <linux/types.h> 43 #include <linux/kernel.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <linux/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 #include <linux/export.h> 91 92 /* Set to 3 to get tracing... */ 93 #define ACONF_DEBUG 2 94 95 #if ACONF_DEBUG >= 3 96 #define ADBG(x) printk x 97 #else 98 #define ADBG(x) 99 #endif 100 101 #define INFINITY_LIFE_TIME 0xFFFFFFFF 102 103 static inline u32 cstamp_delta(unsigned long cstamp) 104 { 105 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 106 } 107 108 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 109 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 110 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 111 112 #ifdef CONFIG_SYSCTL 113 static void addrconf_sysctl_register(struct inet6_dev *idev); 114 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 115 #else 116 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 117 { 118 } 119 120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 121 { 122 } 123 #endif 124 125 #ifdef CONFIG_IPV6_PRIVACY 126 static int __ipv6_regen_rndid(struct inet6_dev *idev); 127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 128 static void ipv6_regen_rndid(unsigned long data); 129 #endif 130 131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 132 static int ipv6_count_addresses(struct inet6_dev *idev); 133 134 /* 135 * Configured unicast address hash table 136 */ 137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 138 static DEFINE_SPINLOCK(addrconf_hash_lock); 139 140 static void addrconf_verify(unsigned long); 141 142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 143 static DEFINE_SPINLOCK(addrconf_verify_lock); 144 145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 147 148 static void addrconf_type_change(struct net_device *dev, 149 unsigned long event); 150 static int addrconf_ifdown(struct net_device *dev, int how); 151 152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 153 static void addrconf_dad_timer(unsigned long data); 154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 155 static void addrconf_dad_run(struct inet6_dev *idev); 156 static void addrconf_rs_timer(unsigned long data); 157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 159 160 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 161 struct prefix_info *pinfo); 162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 163 struct net_device *dev); 164 165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 166 167 static struct ipv6_devconf ipv6_devconf __read_mostly = { 168 .forwarding = 0, 169 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 170 .mtu6 = IPV6_MIN_MTU, 171 .accept_ra = 1, 172 .accept_redirects = 1, 173 .autoconf = 1, 174 .force_mld_version = 0, 175 .dad_transmits = 1, 176 .rtr_solicits = MAX_RTR_SOLICITATIONS, 177 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 178 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 179 #ifdef CONFIG_IPV6_PRIVACY 180 .use_tempaddr = 0, 181 .temp_valid_lft = TEMP_VALID_LIFETIME, 182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 183 .regen_max_retry = REGEN_MAX_RETRY, 184 .max_desync_factor = MAX_DESYNC_FACTOR, 185 #endif 186 .max_addresses = IPV6_MAX_ADDRESSES, 187 .accept_ra_defrtr = 1, 188 .accept_ra_pinfo = 1, 189 #ifdef CONFIG_IPV6_ROUTER_PREF 190 .accept_ra_rtr_pref = 1, 191 .rtr_probe_interval = 60 * HZ, 192 #ifdef CONFIG_IPV6_ROUTE_INFO 193 .accept_ra_rt_info_max_plen = 0, 194 #endif 195 #endif 196 .proxy_ndp = 0, 197 .accept_source_route = 0, /* we do not accept RH0 by default. */ 198 .disable_ipv6 = 0, 199 .accept_dad = 1, 200 }; 201 202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 203 .forwarding = 0, 204 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 205 .mtu6 = IPV6_MIN_MTU, 206 .accept_ra = 1, 207 .accept_redirects = 1, 208 .autoconf = 1, 209 .dad_transmits = 1, 210 .rtr_solicits = MAX_RTR_SOLICITATIONS, 211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 #ifdef CONFIG_IPV6_PRIVACY 214 .use_tempaddr = 0, 215 .temp_valid_lft = TEMP_VALID_LIFETIME, 216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 217 .regen_max_retry = REGEN_MAX_RETRY, 218 .max_desync_factor = MAX_DESYNC_FACTOR, 219 #endif 220 .max_addresses = IPV6_MAX_ADDRESSES, 221 .accept_ra_defrtr = 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_max_plen = 0, 228 #endif 229 #endif 230 .proxy_ndp = 0, 231 .accept_source_route = 0, /* we do not accept RH0 by default. */ 232 .disable_ipv6 = 0, 233 .accept_dad = 1, 234 }; 235 236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 241 242 /* Check if a valid qdisc is available */ 243 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 244 { 245 return !qdisc_tx_is_noop(dev); 246 } 247 248 /* Check if a route is valid prefix route */ 249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 250 { 251 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 252 } 253 254 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 255 { 256 if (del_timer(&ifp->timer)) 257 __in6_ifa_put(ifp); 258 } 259 260 enum addrconf_timer_t { 261 AC_NONE, 262 AC_DAD, 263 AC_RS, 264 }; 265 266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 267 enum addrconf_timer_t what, 268 unsigned long when) 269 { 270 if (!del_timer(&ifp->timer)) 271 in6_ifa_hold(ifp); 272 273 switch (what) { 274 case AC_DAD: 275 ifp->timer.function = addrconf_dad_timer; 276 break; 277 case AC_RS: 278 ifp->timer.function = addrconf_rs_timer; 279 break; 280 default: 281 break; 282 } 283 ifp->timer.expires = jiffies + when; 284 add_timer(&ifp->timer); 285 } 286 287 static int snmp6_alloc_dev(struct inet6_dev *idev) 288 { 289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 290 sizeof(struct ipstats_mib), 291 __alignof__(struct ipstats_mib)) < 0) 292 goto err_ip; 293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 294 GFP_KERNEL); 295 if (!idev->stats.icmpv6dev) 296 goto err_icmp; 297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 298 GFP_KERNEL); 299 if (!idev->stats.icmpv6msgdev) 300 goto err_icmpmsg; 301 302 return 0; 303 304 err_icmpmsg: 305 kfree(idev->stats.icmpv6dev); 306 err_icmp: 307 snmp_mib_free((void __percpu **)idev->stats.ipv6); 308 err_ip: 309 return -ENOMEM; 310 } 311 312 static void snmp6_free_dev(struct inet6_dev *idev) 313 { 314 kfree(idev->stats.icmpv6msgdev); 315 kfree(idev->stats.icmpv6dev); 316 snmp_mib_free((void __percpu **)idev->stats.ipv6); 317 } 318 319 /* Nobody refers to this device, we may destroy it. */ 320 321 void in6_dev_finish_destroy(struct inet6_dev *idev) 322 { 323 struct net_device *dev = idev->dev; 324 325 WARN_ON(!list_empty(&idev->addr_list)); 326 WARN_ON(idev->mc_list != NULL); 327 328 #ifdef NET_REFCNT_DEBUG 329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 330 #endif 331 dev_put(dev); 332 if (!idev->dead) { 333 pr_warning("Freeing alive inet6 device %p\n", idev); 334 return; 335 } 336 snmp6_free_dev(idev); 337 kfree_rcu(idev, rcu); 338 } 339 340 EXPORT_SYMBOL(in6_dev_finish_destroy); 341 342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 343 { 344 struct inet6_dev *ndev; 345 346 ASSERT_RTNL(); 347 348 if (dev->mtu < IPV6_MIN_MTU) 349 return NULL; 350 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 352 353 if (ndev == NULL) 354 return NULL; 355 356 rwlock_init(&ndev->lock); 357 ndev->dev = dev; 358 INIT_LIST_HEAD(&ndev->addr_list); 359 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 361 ndev->cnf.mtu6 = dev->mtu; 362 ndev->cnf.sysctl = NULL; 363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 364 if (ndev->nd_parms == NULL) { 365 kfree(ndev); 366 return NULL; 367 } 368 if (ndev->cnf.forwarding) 369 dev_disable_lro(dev); 370 /* We refer to the device */ 371 dev_hold(dev); 372 373 if (snmp6_alloc_dev(ndev) < 0) { 374 ADBG((KERN_WARNING 375 "%s(): cannot allocate memory for statistics; dev=%s.\n", 376 __func__, dev->name)); 377 neigh_parms_release(&nd_tbl, ndev->nd_parms); 378 dev_put(dev); 379 kfree(ndev); 380 return NULL; 381 } 382 383 if (snmp6_register_dev(ndev) < 0) { 384 ADBG((KERN_WARNING 385 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 386 __func__, dev->name)); 387 neigh_parms_release(&nd_tbl, ndev->nd_parms); 388 ndev->dead = 1; 389 in6_dev_finish_destroy(ndev); 390 return NULL; 391 } 392 393 /* One reference from device. We must do this before 394 * we invoke __ipv6_regen_rndid(). 395 */ 396 in6_dev_hold(ndev); 397 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 399 ndev->cnf.accept_dad = -1; 400 401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 403 printk(KERN_INFO 404 "%s: Disabled Multicast RS\n", 405 dev->name); 406 ndev->cnf.rtr_solicits = 0; 407 } 408 #endif 409 410 #ifdef CONFIG_IPV6_PRIVACY 411 INIT_LIST_HEAD(&ndev->tempaddr_list); 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 413 if ((dev->flags&IFF_LOOPBACK) || 414 dev->type == ARPHRD_TUNNEL || 415 dev->type == ARPHRD_TUNNEL6 || 416 dev->type == ARPHRD_SIT || 417 dev->type == ARPHRD_NONE) { 418 ndev->cnf.use_tempaddr = -1; 419 } else { 420 in6_dev_hold(ndev); 421 ipv6_regen_rndid((unsigned long) ndev); 422 } 423 #endif 424 425 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 426 ndev->if_flags |= IF_READY; 427 428 ipv6_mc_init_dev(ndev); 429 ndev->tstamp = jiffies; 430 addrconf_sysctl_register(ndev); 431 /* protected by rtnl_lock */ 432 RCU_INIT_POINTER(dev->ip6_ptr, ndev); 433 434 /* Join all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 436 437 return ndev; 438 } 439 440 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 441 { 442 struct inet6_dev *idev; 443 444 ASSERT_RTNL(); 445 446 idev = __in6_dev_get(dev); 447 if (!idev) { 448 idev = ipv6_add_dev(dev); 449 if (!idev) 450 return NULL; 451 } 452 453 if (dev->flags&IFF_UP) 454 ipv6_mc_up(idev); 455 return idev; 456 } 457 458 #ifdef CONFIG_SYSCTL 459 static void dev_forward_change(struct inet6_dev *idev) 460 { 461 struct net_device *dev; 462 struct inet6_ifaddr *ifa; 463 464 if (!idev) 465 return; 466 dev = idev->dev; 467 if (idev->cnf.forwarding) 468 dev_disable_lro(dev); 469 if (dev && (dev->flags & IFF_MULTICAST)) { 470 if (idev->cnf.forwarding) 471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 472 else 473 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 474 } 475 476 list_for_each_entry(ifa, &idev->addr_list, if_list) { 477 if (ifa->flags&IFA_F_TENTATIVE) 478 continue; 479 if (idev->cnf.forwarding) 480 addrconf_join_anycast(ifa); 481 else 482 addrconf_leave_anycast(ifa); 483 } 484 } 485 486 487 static void addrconf_forward_change(struct net *net, __s32 newf) 488 { 489 struct net_device *dev; 490 struct inet6_dev *idev; 491 492 rcu_read_lock(); 493 for_each_netdev_rcu(net, dev) { 494 idev = __in6_dev_get(dev); 495 if (idev) { 496 int changed = (!idev->cnf.forwarding) ^ (!newf); 497 idev->cnf.forwarding = newf; 498 if (changed) 499 dev_forward_change(idev); 500 } 501 } 502 rcu_read_unlock(); 503 } 504 505 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 506 { 507 struct net *net; 508 509 net = (struct net *)table->extra2; 510 if (p == &net->ipv6.devconf_dflt->forwarding) 511 return 0; 512 513 if (!rtnl_trylock()) { 514 /* Restore the original values before restarting */ 515 *p = old; 516 return restart_syscall(); 517 } 518 519 if (p == &net->ipv6.devconf_all->forwarding) { 520 __s32 newf = net->ipv6.devconf_all->forwarding; 521 net->ipv6.devconf_dflt->forwarding = newf; 522 addrconf_forward_change(net, newf); 523 } else if ((!*p) ^ (!old)) 524 dev_forward_change((struct inet6_dev *)table->extra1); 525 rtnl_unlock(); 526 527 if (*p) 528 rt6_purge_dflt_routers(net); 529 return 1; 530 } 531 #endif 532 533 /* Nobody refers to this ifaddr, destroy it */ 534 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 535 { 536 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 537 538 #ifdef NET_REFCNT_DEBUG 539 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 540 #endif 541 542 in6_dev_put(ifp->idev); 543 544 if (del_timer(&ifp->timer)) 545 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 546 547 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 548 pr_warning("Freeing alive inet6 address %p\n", ifp); 549 return; 550 } 551 dst_release(&ifp->rt->dst); 552 553 kfree_rcu(ifp, rcu); 554 } 555 556 static void 557 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 558 { 559 struct list_head *p; 560 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 561 562 /* 563 * Each device address list is sorted in order of scope - 564 * global before linklocal. 565 */ 566 list_for_each(p, &idev->addr_list) { 567 struct inet6_ifaddr *ifa 568 = list_entry(p, struct inet6_ifaddr, if_list); 569 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 570 break; 571 } 572 573 list_add_tail(&ifp->if_list, p); 574 } 575 576 static u32 ipv6_addr_hash(const struct in6_addr *addr) 577 { 578 /* 579 * We perform the hash function over the last 64 bits of the address 580 * This will include the IEEE address token on links that support it. 581 */ 582 return jhash_2words((__force u32)addr->s6_addr32[2], 583 (__force u32)addr->s6_addr32[3], 0) 584 & (IN6_ADDR_HSIZE - 1); 585 } 586 587 /* On success it returns ifp with increased reference count */ 588 589 static struct inet6_ifaddr * 590 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 591 int scope, u32 flags) 592 { 593 struct inet6_ifaddr *ifa = NULL; 594 struct rt6_info *rt; 595 unsigned int hash; 596 int err = 0; 597 int addr_type = ipv6_addr_type(addr); 598 599 if (addr_type == IPV6_ADDR_ANY || 600 addr_type & IPV6_ADDR_MULTICAST || 601 (!(idev->dev->flags & IFF_LOOPBACK) && 602 addr_type & IPV6_ADDR_LOOPBACK)) 603 return ERR_PTR(-EADDRNOTAVAIL); 604 605 rcu_read_lock_bh(); 606 if (idev->dead) { 607 err = -ENODEV; /*XXX*/ 608 goto out2; 609 } 610 611 if (idev->cnf.disable_ipv6) { 612 err = -EACCES; 613 goto out2; 614 } 615 616 spin_lock(&addrconf_hash_lock); 617 618 /* Ignore adding duplicate addresses on an interface */ 619 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 620 ADBG(("ipv6_add_addr: already assigned\n")); 621 err = -EEXIST; 622 goto out; 623 } 624 625 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 626 627 if (ifa == NULL) { 628 ADBG(("ipv6_add_addr: malloc failed\n")); 629 err = -ENOBUFS; 630 goto out; 631 } 632 633 rt = addrconf_dst_alloc(idev, addr, false); 634 if (IS_ERR(rt)) { 635 err = PTR_ERR(rt); 636 goto out; 637 } 638 639 ifa->addr = *addr; 640 641 spin_lock_init(&ifa->lock); 642 spin_lock_init(&ifa->state_lock); 643 init_timer(&ifa->timer); 644 INIT_HLIST_NODE(&ifa->addr_lst); 645 ifa->timer.data = (unsigned long) ifa; 646 ifa->scope = scope; 647 ifa->prefix_len = pfxlen; 648 ifa->flags = flags | IFA_F_TENTATIVE; 649 ifa->cstamp = ifa->tstamp = jiffies; 650 651 ifa->rt = rt; 652 653 /* 654 * part one of RFC 4429, section 3.3 655 * We should not configure an address as 656 * optimistic if we do not yet know the link 657 * layer address of our nexhop router 658 */ 659 660 if (dst_get_neighbour_noref_raw(&rt->dst) == NULL) 661 ifa->flags &= ~IFA_F_OPTIMISTIC; 662 663 ifa->idev = idev; 664 in6_dev_hold(idev); 665 /* For caller */ 666 in6_ifa_hold(ifa); 667 668 /* Add to big hash table */ 669 hash = ipv6_addr_hash(addr); 670 671 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 672 spin_unlock(&addrconf_hash_lock); 673 674 write_lock(&idev->lock); 675 /* Add to inet6_dev unicast addr list. */ 676 ipv6_link_dev_addr(idev, ifa); 677 678 #ifdef CONFIG_IPV6_PRIVACY 679 if (ifa->flags&IFA_F_TEMPORARY) { 680 list_add(&ifa->tmp_list, &idev->tempaddr_list); 681 in6_ifa_hold(ifa); 682 } 683 #endif 684 685 in6_ifa_hold(ifa); 686 write_unlock(&idev->lock); 687 out2: 688 rcu_read_unlock_bh(); 689 690 if (likely(err == 0)) 691 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 692 else { 693 kfree(ifa); 694 ifa = ERR_PTR(err); 695 } 696 697 return ifa; 698 out: 699 spin_unlock(&addrconf_hash_lock); 700 goto out2; 701 } 702 703 /* This function wants to get referenced ifp and releases it before return */ 704 705 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 706 { 707 struct inet6_ifaddr *ifa, *ifn; 708 struct inet6_dev *idev = ifp->idev; 709 int state; 710 int deleted = 0, onlink = 0; 711 unsigned long expires = jiffies; 712 713 spin_lock_bh(&ifp->state_lock); 714 state = ifp->state; 715 ifp->state = INET6_IFADDR_STATE_DEAD; 716 spin_unlock_bh(&ifp->state_lock); 717 718 if (state == INET6_IFADDR_STATE_DEAD) 719 goto out; 720 721 spin_lock_bh(&addrconf_hash_lock); 722 hlist_del_init_rcu(&ifp->addr_lst); 723 spin_unlock_bh(&addrconf_hash_lock); 724 725 write_lock_bh(&idev->lock); 726 #ifdef CONFIG_IPV6_PRIVACY 727 if (ifp->flags&IFA_F_TEMPORARY) { 728 list_del(&ifp->tmp_list); 729 if (ifp->ifpub) { 730 in6_ifa_put(ifp->ifpub); 731 ifp->ifpub = NULL; 732 } 733 __in6_ifa_put(ifp); 734 } 735 #endif 736 737 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 738 if (ifa == ifp) { 739 list_del_init(&ifp->if_list); 740 __in6_ifa_put(ifp); 741 742 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 743 break; 744 deleted = 1; 745 continue; 746 } else if (ifp->flags & IFA_F_PERMANENT) { 747 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 748 ifp->prefix_len)) { 749 if (ifa->flags & IFA_F_PERMANENT) { 750 onlink = 1; 751 if (deleted) 752 break; 753 } else { 754 unsigned long lifetime; 755 756 if (!onlink) 757 onlink = -1; 758 759 spin_lock(&ifa->lock); 760 761 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 762 /* 763 * Note: Because this address is 764 * not permanent, lifetime < 765 * LONG_MAX / HZ here. 766 */ 767 if (time_before(expires, 768 ifa->tstamp + lifetime * HZ)) 769 expires = ifa->tstamp + lifetime * HZ; 770 spin_unlock(&ifa->lock); 771 } 772 } 773 } 774 } 775 write_unlock_bh(&idev->lock); 776 777 addrconf_del_timer(ifp); 778 779 ipv6_ifa_notify(RTM_DELADDR, ifp); 780 781 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 782 783 /* 784 * Purge or update corresponding prefix 785 * 786 * 1) we don't purge prefix here if address was not permanent. 787 * prefix is managed by its own lifetime. 788 * 2) if there're no addresses, delete prefix. 789 * 3) if there're still other permanent address(es), 790 * corresponding prefix is still permanent. 791 * 4) otherwise, update prefix lifetime to the 792 * longest valid lifetime among the corresponding 793 * addresses on the device. 794 * Note: subsequent RA will update lifetime. 795 * 796 * --yoshfuji 797 */ 798 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 799 struct in6_addr prefix; 800 struct rt6_info *rt; 801 struct net *net = dev_net(ifp->idev->dev); 802 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 803 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 804 805 if (rt && addrconf_is_prefix_route(rt)) { 806 if (onlink == 0) { 807 ip6_del_rt(rt); 808 rt = NULL; 809 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 810 rt->rt6i_expires = expires; 811 rt->rt6i_flags |= RTF_EXPIRES; 812 } 813 } 814 dst_release(&rt->dst); 815 } 816 817 /* clean up prefsrc entries */ 818 rt6_remove_prefsrc(ifp); 819 out: 820 in6_ifa_put(ifp); 821 } 822 823 #ifdef CONFIG_IPV6_PRIVACY 824 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 825 { 826 struct inet6_dev *idev = ifp->idev; 827 struct in6_addr addr, *tmpaddr; 828 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 829 unsigned long regen_advance; 830 int tmp_plen; 831 int ret = 0; 832 int max_addresses; 833 u32 addr_flags; 834 unsigned long now = jiffies; 835 836 write_lock(&idev->lock); 837 if (ift) { 838 spin_lock_bh(&ift->lock); 839 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 840 spin_unlock_bh(&ift->lock); 841 tmpaddr = &addr; 842 } else { 843 tmpaddr = NULL; 844 } 845 retry: 846 in6_dev_hold(idev); 847 if (idev->cnf.use_tempaddr <= 0) { 848 write_unlock(&idev->lock); 849 printk(KERN_INFO 850 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 851 in6_dev_put(idev); 852 ret = -1; 853 goto out; 854 } 855 spin_lock_bh(&ifp->lock); 856 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 857 idev->cnf.use_tempaddr = -1; /*XXX*/ 858 spin_unlock_bh(&ifp->lock); 859 write_unlock(&idev->lock); 860 printk(KERN_WARNING 861 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 862 in6_dev_put(idev); 863 ret = -1; 864 goto out; 865 } 866 in6_ifa_hold(ifp); 867 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 868 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 869 spin_unlock_bh(&ifp->lock); 870 write_unlock(&idev->lock); 871 printk(KERN_WARNING 872 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 873 in6_ifa_put(ifp); 874 in6_dev_put(idev); 875 ret = -1; 876 goto out; 877 } 878 memcpy(&addr.s6_addr[8], idev->rndid, 8); 879 age = (now - ifp->tstamp) / HZ; 880 tmp_valid_lft = min_t(__u32, 881 ifp->valid_lft, 882 idev->cnf.temp_valid_lft + age); 883 tmp_prefered_lft = min_t(__u32, 884 ifp->prefered_lft, 885 idev->cnf.temp_prefered_lft + age - 886 idev->cnf.max_desync_factor); 887 tmp_plen = ifp->prefix_len; 888 max_addresses = idev->cnf.max_addresses; 889 tmp_tstamp = ifp->tstamp; 890 spin_unlock_bh(&ifp->lock); 891 892 regen_advance = idev->cnf.regen_max_retry * 893 idev->cnf.dad_transmits * 894 idev->nd_parms->retrans_time / HZ; 895 write_unlock(&idev->lock); 896 897 /* A temporary address is created only if this calculated Preferred 898 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 899 * an implementation must not create a temporary address with a zero 900 * Preferred Lifetime. 901 */ 902 if (tmp_prefered_lft <= regen_advance) { 903 in6_ifa_put(ifp); 904 in6_dev_put(idev); 905 ret = -1; 906 goto out; 907 } 908 909 addr_flags = IFA_F_TEMPORARY; 910 /* set in addrconf_prefix_rcv() */ 911 if (ifp->flags & IFA_F_OPTIMISTIC) 912 addr_flags |= IFA_F_OPTIMISTIC; 913 914 ift = !max_addresses || 915 ipv6_count_addresses(idev) < max_addresses ? 916 ipv6_add_addr(idev, &addr, tmp_plen, 917 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 918 addr_flags) : NULL; 919 if (!ift || IS_ERR(ift)) { 920 in6_ifa_put(ifp); 921 in6_dev_put(idev); 922 printk(KERN_INFO 923 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 924 tmpaddr = &addr; 925 write_lock(&idev->lock); 926 goto retry; 927 } 928 929 spin_lock_bh(&ift->lock); 930 ift->ifpub = ifp; 931 ift->valid_lft = tmp_valid_lft; 932 ift->prefered_lft = tmp_prefered_lft; 933 ift->cstamp = now; 934 ift->tstamp = tmp_tstamp; 935 spin_unlock_bh(&ift->lock); 936 937 addrconf_dad_start(ift, 0); 938 in6_ifa_put(ift); 939 in6_dev_put(idev); 940 out: 941 return ret; 942 } 943 #endif 944 945 /* 946 * Choose an appropriate source address (RFC3484) 947 */ 948 enum { 949 IPV6_SADDR_RULE_INIT = 0, 950 IPV6_SADDR_RULE_LOCAL, 951 IPV6_SADDR_RULE_SCOPE, 952 IPV6_SADDR_RULE_PREFERRED, 953 #ifdef CONFIG_IPV6_MIP6 954 IPV6_SADDR_RULE_HOA, 955 #endif 956 IPV6_SADDR_RULE_OIF, 957 IPV6_SADDR_RULE_LABEL, 958 #ifdef CONFIG_IPV6_PRIVACY 959 IPV6_SADDR_RULE_PRIVACY, 960 #endif 961 IPV6_SADDR_RULE_ORCHID, 962 IPV6_SADDR_RULE_PREFIX, 963 IPV6_SADDR_RULE_MAX 964 }; 965 966 struct ipv6_saddr_score { 967 int rule; 968 int addr_type; 969 struct inet6_ifaddr *ifa; 970 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 971 int scopedist; 972 int matchlen; 973 }; 974 975 struct ipv6_saddr_dst { 976 const struct in6_addr *addr; 977 int ifindex; 978 int scope; 979 int label; 980 unsigned int prefs; 981 }; 982 983 static inline int ipv6_saddr_preferred(int type) 984 { 985 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 986 return 1; 987 return 0; 988 } 989 990 static int ipv6_get_saddr_eval(struct net *net, 991 struct ipv6_saddr_score *score, 992 struct ipv6_saddr_dst *dst, 993 int i) 994 { 995 int ret; 996 997 if (i <= score->rule) { 998 switch (i) { 999 case IPV6_SADDR_RULE_SCOPE: 1000 ret = score->scopedist; 1001 break; 1002 case IPV6_SADDR_RULE_PREFIX: 1003 ret = score->matchlen; 1004 break; 1005 default: 1006 ret = !!test_bit(i, score->scorebits); 1007 } 1008 goto out; 1009 } 1010 1011 switch (i) { 1012 case IPV6_SADDR_RULE_INIT: 1013 /* Rule 0: remember if hiscore is not ready yet */ 1014 ret = !!score->ifa; 1015 break; 1016 case IPV6_SADDR_RULE_LOCAL: 1017 /* Rule 1: Prefer same address */ 1018 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1019 break; 1020 case IPV6_SADDR_RULE_SCOPE: 1021 /* Rule 2: Prefer appropriate scope 1022 * 1023 * ret 1024 * ^ 1025 * -1 | d 15 1026 * ---+--+-+---> scope 1027 * | 1028 * | d is scope of the destination. 1029 * B-d | \ 1030 * | \ <- smaller scope is better if 1031 * B-15 | \ if scope is enough for destinaion. 1032 * | ret = B - scope (-1 <= scope >= d <= 15). 1033 * d-C-1 | / 1034 * |/ <- greater is better 1035 * -C / if scope is not enough for destination. 1036 * /| ret = scope - C (-1 <= d < scope <= 15). 1037 * 1038 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1039 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1040 * Assume B = 0 and we get C > 29. 1041 */ 1042 ret = __ipv6_addr_src_scope(score->addr_type); 1043 if (ret >= dst->scope) 1044 ret = -ret; 1045 else 1046 ret -= 128; /* 30 is enough */ 1047 score->scopedist = ret; 1048 break; 1049 case IPV6_SADDR_RULE_PREFERRED: 1050 /* Rule 3: Avoid deprecated and optimistic addresses */ 1051 ret = ipv6_saddr_preferred(score->addr_type) || 1052 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1053 break; 1054 #ifdef CONFIG_IPV6_MIP6 1055 case IPV6_SADDR_RULE_HOA: 1056 { 1057 /* Rule 4: Prefer home address */ 1058 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1059 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1060 break; 1061 } 1062 #endif 1063 case IPV6_SADDR_RULE_OIF: 1064 /* Rule 5: Prefer outgoing interface */ 1065 ret = (!dst->ifindex || 1066 dst->ifindex == score->ifa->idev->dev->ifindex); 1067 break; 1068 case IPV6_SADDR_RULE_LABEL: 1069 /* Rule 6: Prefer matching label */ 1070 ret = ipv6_addr_label(net, 1071 &score->ifa->addr, score->addr_type, 1072 score->ifa->idev->dev->ifindex) == dst->label; 1073 break; 1074 #ifdef CONFIG_IPV6_PRIVACY 1075 case IPV6_SADDR_RULE_PRIVACY: 1076 { 1077 /* Rule 7: Prefer public address 1078 * Note: prefer temporary address if use_tempaddr >= 2 1079 */ 1080 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1081 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1082 score->ifa->idev->cnf.use_tempaddr >= 2; 1083 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1084 break; 1085 } 1086 #endif 1087 case IPV6_SADDR_RULE_ORCHID: 1088 /* Rule 8-: Prefer ORCHID vs ORCHID or 1089 * non-ORCHID vs non-ORCHID 1090 */ 1091 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1092 ipv6_addr_orchid(dst->addr)); 1093 break; 1094 case IPV6_SADDR_RULE_PREFIX: 1095 /* Rule 8: Use longest matching prefix */ 1096 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1097 dst->addr); 1098 break; 1099 default: 1100 ret = 0; 1101 } 1102 1103 if (ret) 1104 __set_bit(i, score->scorebits); 1105 score->rule = i; 1106 out: 1107 return ret; 1108 } 1109 1110 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1111 const struct in6_addr *daddr, unsigned int prefs, 1112 struct in6_addr *saddr) 1113 { 1114 struct ipv6_saddr_score scores[2], 1115 *score = &scores[0], *hiscore = &scores[1]; 1116 struct ipv6_saddr_dst dst; 1117 struct net_device *dev; 1118 int dst_type; 1119 1120 dst_type = __ipv6_addr_type(daddr); 1121 dst.addr = daddr; 1122 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1123 dst.scope = __ipv6_addr_src_scope(dst_type); 1124 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1125 dst.prefs = prefs; 1126 1127 hiscore->rule = -1; 1128 hiscore->ifa = NULL; 1129 1130 rcu_read_lock(); 1131 1132 for_each_netdev_rcu(net, dev) { 1133 struct inet6_dev *idev; 1134 1135 /* Candidate Source Address (section 4) 1136 * - multicast and link-local destination address, 1137 * the set of candidate source address MUST only 1138 * include addresses assigned to interfaces 1139 * belonging to the same link as the outgoing 1140 * interface. 1141 * (- For site-local destination addresses, the 1142 * set of candidate source addresses MUST only 1143 * include addresses assigned to interfaces 1144 * belonging to the same site as the outgoing 1145 * interface.) 1146 */ 1147 if (((dst_type & IPV6_ADDR_MULTICAST) || 1148 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1149 dst.ifindex && dev->ifindex != dst.ifindex) 1150 continue; 1151 1152 idev = __in6_dev_get(dev); 1153 if (!idev) 1154 continue; 1155 1156 read_lock_bh(&idev->lock); 1157 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1158 int i; 1159 1160 /* 1161 * - Tentative Address (RFC2462 section 5.4) 1162 * - A tentative address is not considered 1163 * "assigned to an interface" in the traditional 1164 * sense, unless it is also flagged as optimistic. 1165 * - Candidate Source Address (section 4) 1166 * - In any case, anycast addresses, multicast 1167 * addresses, and the unspecified address MUST 1168 * NOT be included in a candidate set. 1169 */ 1170 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1171 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1172 continue; 1173 1174 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1175 1176 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1177 score->addr_type & IPV6_ADDR_MULTICAST)) { 1178 LIMIT_NETDEBUG(KERN_DEBUG 1179 "ADDRCONF: unspecified / multicast address " 1180 "assigned as unicast address on %s", 1181 dev->name); 1182 continue; 1183 } 1184 1185 score->rule = -1; 1186 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1187 1188 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1189 int minihiscore, miniscore; 1190 1191 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1192 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1193 1194 if (minihiscore > miniscore) { 1195 if (i == IPV6_SADDR_RULE_SCOPE && 1196 score->scopedist > 0) { 1197 /* 1198 * special case: 1199 * each remaining entry 1200 * has too small (not enough) 1201 * scope, because ifa entries 1202 * are sorted by their scope 1203 * values. 1204 */ 1205 goto try_nextdev; 1206 } 1207 break; 1208 } else if (minihiscore < miniscore) { 1209 if (hiscore->ifa) 1210 in6_ifa_put(hiscore->ifa); 1211 1212 in6_ifa_hold(score->ifa); 1213 1214 swap(hiscore, score); 1215 1216 /* restore our iterator */ 1217 score->ifa = hiscore->ifa; 1218 1219 break; 1220 } 1221 } 1222 } 1223 try_nextdev: 1224 read_unlock_bh(&idev->lock); 1225 } 1226 rcu_read_unlock(); 1227 1228 if (!hiscore->ifa) 1229 return -EADDRNOTAVAIL; 1230 1231 *saddr = hiscore->ifa->addr; 1232 in6_ifa_put(hiscore->ifa); 1233 return 0; 1234 } 1235 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1236 1237 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1238 unsigned char banned_flags) 1239 { 1240 struct inet6_dev *idev; 1241 int err = -EADDRNOTAVAIL; 1242 1243 rcu_read_lock(); 1244 idev = __in6_dev_get(dev); 1245 if (idev) { 1246 struct inet6_ifaddr *ifp; 1247 1248 read_lock_bh(&idev->lock); 1249 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1250 if (ifp->scope == IFA_LINK && 1251 !(ifp->flags & banned_flags)) { 1252 *addr = ifp->addr; 1253 err = 0; 1254 break; 1255 } 1256 } 1257 read_unlock_bh(&idev->lock); 1258 } 1259 rcu_read_unlock(); 1260 return err; 1261 } 1262 1263 static int ipv6_count_addresses(struct inet6_dev *idev) 1264 { 1265 int cnt = 0; 1266 struct inet6_ifaddr *ifp; 1267 1268 read_lock_bh(&idev->lock); 1269 list_for_each_entry(ifp, &idev->addr_list, if_list) 1270 cnt++; 1271 read_unlock_bh(&idev->lock); 1272 return cnt; 1273 } 1274 1275 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1276 struct net_device *dev, int strict) 1277 { 1278 struct inet6_ifaddr *ifp; 1279 struct hlist_node *node; 1280 unsigned int hash = ipv6_addr_hash(addr); 1281 1282 rcu_read_lock_bh(); 1283 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1284 if (!net_eq(dev_net(ifp->idev->dev), net)) 1285 continue; 1286 if (ipv6_addr_equal(&ifp->addr, addr) && 1287 !(ifp->flags&IFA_F_TENTATIVE) && 1288 (dev == NULL || ifp->idev->dev == dev || 1289 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1290 rcu_read_unlock_bh(); 1291 return 1; 1292 } 1293 } 1294 1295 rcu_read_unlock_bh(); 1296 return 0; 1297 } 1298 EXPORT_SYMBOL(ipv6_chk_addr); 1299 1300 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1301 struct net_device *dev) 1302 { 1303 unsigned int hash = ipv6_addr_hash(addr); 1304 struct inet6_ifaddr *ifp; 1305 struct hlist_node *node; 1306 1307 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1308 if (!net_eq(dev_net(ifp->idev->dev), net)) 1309 continue; 1310 if (ipv6_addr_equal(&ifp->addr, addr)) { 1311 if (dev == NULL || ifp->idev->dev == dev) 1312 return true; 1313 } 1314 } 1315 return false; 1316 } 1317 1318 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1319 { 1320 struct inet6_dev *idev; 1321 struct inet6_ifaddr *ifa; 1322 int onlink; 1323 1324 onlink = 0; 1325 rcu_read_lock(); 1326 idev = __in6_dev_get(dev); 1327 if (idev) { 1328 read_lock_bh(&idev->lock); 1329 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1330 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1331 ifa->prefix_len); 1332 if (onlink) 1333 break; 1334 } 1335 read_unlock_bh(&idev->lock); 1336 } 1337 rcu_read_unlock(); 1338 return onlink; 1339 } 1340 1341 EXPORT_SYMBOL(ipv6_chk_prefix); 1342 1343 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1344 struct net_device *dev, int strict) 1345 { 1346 struct inet6_ifaddr *ifp, *result = NULL; 1347 unsigned int hash = ipv6_addr_hash(addr); 1348 struct hlist_node *node; 1349 1350 rcu_read_lock_bh(); 1351 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1352 if (!net_eq(dev_net(ifp->idev->dev), net)) 1353 continue; 1354 if (ipv6_addr_equal(&ifp->addr, addr)) { 1355 if (dev == NULL || ifp->idev->dev == dev || 1356 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1357 result = ifp; 1358 in6_ifa_hold(ifp); 1359 break; 1360 } 1361 } 1362 } 1363 rcu_read_unlock_bh(); 1364 1365 return result; 1366 } 1367 1368 /* Gets referenced address, destroys ifaddr */ 1369 1370 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1371 { 1372 if (ifp->flags&IFA_F_PERMANENT) { 1373 spin_lock_bh(&ifp->lock); 1374 addrconf_del_timer(ifp); 1375 ifp->flags |= IFA_F_TENTATIVE; 1376 if (dad_failed) 1377 ifp->flags |= IFA_F_DADFAILED; 1378 spin_unlock_bh(&ifp->lock); 1379 if (dad_failed) 1380 ipv6_ifa_notify(0, ifp); 1381 in6_ifa_put(ifp); 1382 #ifdef CONFIG_IPV6_PRIVACY 1383 } else if (ifp->flags&IFA_F_TEMPORARY) { 1384 struct inet6_ifaddr *ifpub; 1385 spin_lock_bh(&ifp->lock); 1386 ifpub = ifp->ifpub; 1387 if (ifpub) { 1388 in6_ifa_hold(ifpub); 1389 spin_unlock_bh(&ifp->lock); 1390 ipv6_create_tempaddr(ifpub, ifp); 1391 in6_ifa_put(ifpub); 1392 } else { 1393 spin_unlock_bh(&ifp->lock); 1394 } 1395 ipv6_del_addr(ifp); 1396 #endif 1397 } else 1398 ipv6_del_addr(ifp); 1399 } 1400 1401 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1402 { 1403 int err = -ENOENT; 1404 1405 spin_lock(&ifp->state_lock); 1406 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1407 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1408 err = 0; 1409 } 1410 spin_unlock(&ifp->state_lock); 1411 1412 return err; 1413 } 1414 1415 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1416 { 1417 struct inet6_dev *idev = ifp->idev; 1418 1419 if (addrconf_dad_end(ifp)) { 1420 in6_ifa_put(ifp); 1421 return; 1422 } 1423 1424 if (net_ratelimit()) 1425 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1426 ifp->idev->dev->name, &ifp->addr); 1427 1428 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1429 struct in6_addr addr; 1430 1431 addr.s6_addr32[0] = htonl(0xfe800000); 1432 addr.s6_addr32[1] = 0; 1433 1434 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1435 ipv6_addr_equal(&ifp->addr, &addr)) { 1436 /* DAD failed for link-local based on MAC address */ 1437 idev->cnf.disable_ipv6 = 1; 1438 1439 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1440 ifp->idev->dev->name); 1441 } 1442 } 1443 1444 addrconf_dad_stop(ifp, 1); 1445 } 1446 1447 /* Join to solicited addr multicast group. */ 1448 1449 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1450 { 1451 struct in6_addr maddr; 1452 1453 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1454 return; 1455 1456 addrconf_addr_solict_mult(addr, &maddr); 1457 ipv6_dev_mc_inc(dev, &maddr); 1458 } 1459 1460 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1461 { 1462 struct in6_addr maddr; 1463 1464 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1465 return; 1466 1467 addrconf_addr_solict_mult(addr, &maddr); 1468 __ipv6_dev_mc_dec(idev, &maddr); 1469 } 1470 1471 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1472 { 1473 struct in6_addr addr; 1474 if (ifp->prefix_len == 127) /* RFC 6164 */ 1475 return; 1476 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1477 if (ipv6_addr_any(&addr)) 1478 return; 1479 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1480 } 1481 1482 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1483 { 1484 struct in6_addr addr; 1485 if (ifp->prefix_len == 127) /* RFC 6164 */ 1486 return; 1487 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1488 if (ipv6_addr_any(&addr)) 1489 return; 1490 __ipv6_dev_ac_dec(ifp->idev, &addr); 1491 } 1492 1493 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1494 { 1495 if (dev->addr_len != ETH_ALEN) 1496 return -1; 1497 memcpy(eui, dev->dev_addr, 3); 1498 memcpy(eui + 5, dev->dev_addr + 3, 3); 1499 1500 /* 1501 * The zSeries OSA network cards can be shared among various 1502 * OS instances, but the OSA cards have only one MAC address. 1503 * This leads to duplicate address conflicts in conjunction 1504 * with IPv6 if more than one instance uses the same card. 1505 * 1506 * The driver for these cards can deliver a unique 16-bit 1507 * identifier for each instance sharing the same card. It is 1508 * placed instead of 0xFFFE in the interface identifier. The 1509 * "u" bit of the interface identifier is not inverted in this 1510 * case. Hence the resulting interface identifier has local 1511 * scope according to RFC2373. 1512 */ 1513 if (dev->dev_id) { 1514 eui[3] = (dev->dev_id >> 8) & 0xFF; 1515 eui[4] = dev->dev_id & 0xFF; 1516 } else { 1517 eui[3] = 0xFF; 1518 eui[4] = 0xFE; 1519 eui[0] ^= 2; 1520 } 1521 return 0; 1522 } 1523 1524 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1525 { 1526 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1527 if (dev->addr_len != ARCNET_ALEN) 1528 return -1; 1529 memset(eui, 0, 7); 1530 eui[7] = *(u8*)dev->dev_addr; 1531 return 0; 1532 } 1533 1534 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1535 { 1536 if (dev->addr_len != INFINIBAND_ALEN) 1537 return -1; 1538 memcpy(eui, dev->dev_addr + 12, 8); 1539 eui[0] |= 2; 1540 return 0; 1541 } 1542 1543 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1544 { 1545 if (addr == 0) 1546 return -1; 1547 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1548 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1549 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1550 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1551 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1552 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1553 eui[1] = 0; 1554 eui[2] = 0x5E; 1555 eui[3] = 0xFE; 1556 memcpy(eui + 4, &addr, 4); 1557 return 0; 1558 } 1559 1560 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1561 { 1562 if (dev->priv_flags & IFF_ISATAP) 1563 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1564 return -1; 1565 } 1566 1567 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1568 { 1569 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1570 } 1571 1572 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1573 { 1574 switch (dev->type) { 1575 case ARPHRD_ETHER: 1576 case ARPHRD_FDDI: 1577 case ARPHRD_IEEE802_TR: 1578 return addrconf_ifid_eui48(eui, dev); 1579 case ARPHRD_ARCNET: 1580 return addrconf_ifid_arcnet(eui, dev); 1581 case ARPHRD_INFINIBAND: 1582 return addrconf_ifid_infiniband(eui, dev); 1583 case ARPHRD_SIT: 1584 return addrconf_ifid_sit(eui, dev); 1585 case ARPHRD_IPGRE: 1586 return addrconf_ifid_gre(eui, dev); 1587 } 1588 return -1; 1589 } 1590 1591 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1592 { 1593 int err = -1; 1594 struct inet6_ifaddr *ifp; 1595 1596 read_lock_bh(&idev->lock); 1597 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1598 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1599 memcpy(eui, ifp->addr.s6_addr+8, 8); 1600 err = 0; 1601 break; 1602 } 1603 } 1604 read_unlock_bh(&idev->lock); 1605 return err; 1606 } 1607 1608 #ifdef CONFIG_IPV6_PRIVACY 1609 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1610 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1611 { 1612 regen: 1613 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1614 idev->rndid[0] &= ~0x02; 1615 1616 /* 1617 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1618 * check if generated address is not inappropriate 1619 * 1620 * - Reserved subnet anycast (RFC 2526) 1621 * 11111101 11....11 1xxxxxxx 1622 * - ISATAP (RFC4214) 6.1 1623 * 00-00-5E-FE-xx-xx-xx-xx 1624 * - value 0 1625 * - XXX: already assigned to an address on the device 1626 */ 1627 if (idev->rndid[0] == 0xfd && 1628 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1629 (idev->rndid[7]&0x80)) 1630 goto regen; 1631 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1632 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1633 goto regen; 1634 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1635 goto regen; 1636 } 1637 1638 return 0; 1639 } 1640 1641 static void ipv6_regen_rndid(unsigned long data) 1642 { 1643 struct inet6_dev *idev = (struct inet6_dev *) data; 1644 unsigned long expires; 1645 1646 rcu_read_lock_bh(); 1647 write_lock_bh(&idev->lock); 1648 1649 if (idev->dead) 1650 goto out; 1651 1652 if (__ipv6_regen_rndid(idev) < 0) 1653 goto out; 1654 1655 expires = jiffies + 1656 idev->cnf.temp_prefered_lft * HZ - 1657 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1658 idev->cnf.max_desync_factor * HZ; 1659 if (time_before(expires, jiffies)) { 1660 printk(KERN_WARNING 1661 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1662 idev->dev->name); 1663 goto out; 1664 } 1665 1666 if (!mod_timer(&idev->regen_timer, expires)) 1667 in6_dev_hold(idev); 1668 1669 out: 1670 write_unlock_bh(&idev->lock); 1671 rcu_read_unlock_bh(); 1672 in6_dev_put(idev); 1673 } 1674 1675 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1676 int ret = 0; 1677 1678 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1679 ret = __ipv6_regen_rndid(idev); 1680 return ret; 1681 } 1682 #endif 1683 1684 /* 1685 * Add prefix route. 1686 */ 1687 1688 static void 1689 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1690 unsigned long expires, u32 flags) 1691 { 1692 struct fib6_config cfg = { 1693 .fc_table = RT6_TABLE_PREFIX, 1694 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1695 .fc_ifindex = dev->ifindex, 1696 .fc_expires = expires, 1697 .fc_dst_len = plen, 1698 .fc_flags = RTF_UP | flags, 1699 .fc_nlinfo.nl_net = dev_net(dev), 1700 .fc_protocol = RTPROT_KERNEL, 1701 }; 1702 1703 cfg.fc_dst = *pfx; 1704 1705 /* Prevent useless cloning on PtP SIT. 1706 This thing is done here expecting that the whole 1707 class of non-broadcast devices need not cloning. 1708 */ 1709 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1710 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1711 cfg.fc_flags |= RTF_NONEXTHOP; 1712 #endif 1713 1714 ip6_route_add(&cfg); 1715 } 1716 1717 1718 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1719 int plen, 1720 const struct net_device *dev, 1721 u32 flags, u32 noflags) 1722 { 1723 struct fib6_node *fn; 1724 struct rt6_info *rt = NULL; 1725 struct fib6_table *table; 1726 1727 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1728 if (table == NULL) 1729 return NULL; 1730 1731 write_lock_bh(&table->tb6_lock); 1732 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1733 if (!fn) 1734 goto out; 1735 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1736 if (rt->rt6i_dev->ifindex != dev->ifindex) 1737 continue; 1738 if ((rt->rt6i_flags & flags) != flags) 1739 continue; 1740 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0)) 1741 continue; 1742 dst_hold(&rt->dst); 1743 break; 1744 } 1745 out: 1746 write_unlock_bh(&table->tb6_lock); 1747 return rt; 1748 } 1749 1750 1751 /* Create "default" multicast route to the interface */ 1752 1753 static void addrconf_add_mroute(struct net_device *dev) 1754 { 1755 struct fib6_config cfg = { 1756 .fc_table = RT6_TABLE_LOCAL, 1757 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1758 .fc_ifindex = dev->ifindex, 1759 .fc_dst_len = 8, 1760 .fc_flags = RTF_UP, 1761 .fc_nlinfo.nl_net = dev_net(dev), 1762 }; 1763 1764 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1765 1766 ip6_route_add(&cfg); 1767 } 1768 1769 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1770 static void sit_route_add(struct net_device *dev) 1771 { 1772 struct fib6_config cfg = { 1773 .fc_table = RT6_TABLE_MAIN, 1774 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1775 .fc_ifindex = dev->ifindex, 1776 .fc_dst_len = 96, 1777 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1778 .fc_nlinfo.nl_net = dev_net(dev), 1779 }; 1780 1781 /* prefix length - 96 bits "::d.d.d.d" */ 1782 ip6_route_add(&cfg); 1783 } 1784 #endif 1785 1786 static void addrconf_add_lroute(struct net_device *dev) 1787 { 1788 struct in6_addr addr; 1789 1790 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1791 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1792 } 1793 1794 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1795 { 1796 struct inet6_dev *idev; 1797 1798 ASSERT_RTNL(); 1799 1800 idev = ipv6_find_idev(dev); 1801 if (!idev) 1802 return ERR_PTR(-ENOBUFS); 1803 1804 if (idev->cnf.disable_ipv6) 1805 return ERR_PTR(-EACCES); 1806 1807 /* Add default multicast route */ 1808 addrconf_add_mroute(dev); 1809 1810 /* Add link local route */ 1811 addrconf_add_lroute(dev); 1812 return idev; 1813 } 1814 1815 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1816 { 1817 struct prefix_info *pinfo; 1818 __u32 valid_lft; 1819 __u32 prefered_lft; 1820 int addr_type; 1821 struct inet6_dev *in6_dev; 1822 struct net *net = dev_net(dev); 1823 1824 pinfo = (struct prefix_info *) opt; 1825 1826 if (len < sizeof(struct prefix_info)) { 1827 ADBG(("addrconf: prefix option too short\n")); 1828 return; 1829 } 1830 1831 /* 1832 * Validation checks ([ADDRCONF], page 19) 1833 */ 1834 1835 addr_type = ipv6_addr_type(&pinfo->prefix); 1836 1837 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1838 return; 1839 1840 valid_lft = ntohl(pinfo->valid); 1841 prefered_lft = ntohl(pinfo->prefered); 1842 1843 if (prefered_lft > valid_lft) { 1844 if (net_ratelimit()) 1845 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1846 return; 1847 } 1848 1849 in6_dev = in6_dev_get(dev); 1850 1851 if (in6_dev == NULL) { 1852 if (net_ratelimit()) 1853 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1854 return; 1855 } 1856 1857 /* 1858 * Two things going on here: 1859 * 1) Add routes for on-link prefixes 1860 * 2) Configure prefixes with the auto flag set 1861 */ 1862 1863 if (pinfo->onlink) { 1864 struct rt6_info *rt; 1865 unsigned long rt_expires; 1866 1867 /* Avoid arithmetic overflow. Really, we could 1868 * save rt_expires in seconds, likely valid_lft, 1869 * but it would require division in fib gc, that it 1870 * not good. 1871 */ 1872 if (HZ > USER_HZ) 1873 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1874 else 1875 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1876 1877 if (addrconf_finite_timeout(rt_expires)) 1878 rt_expires *= HZ; 1879 1880 rt = addrconf_get_prefix_route(&pinfo->prefix, 1881 pinfo->prefix_len, 1882 dev, 1883 RTF_ADDRCONF | RTF_PREFIX_RT, 1884 RTF_GATEWAY | RTF_DEFAULT); 1885 1886 if (rt) { 1887 /* Autoconf prefix route */ 1888 if (valid_lft == 0) { 1889 ip6_del_rt(rt); 1890 rt = NULL; 1891 } else if (addrconf_finite_timeout(rt_expires)) { 1892 /* not infinity */ 1893 rt->rt6i_expires = jiffies + rt_expires; 1894 rt->rt6i_flags |= RTF_EXPIRES; 1895 } else { 1896 rt->rt6i_flags &= ~RTF_EXPIRES; 1897 rt->rt6i_expires = 0; 1898 } 1899 } else if (valid_lft) { 1900 clock_t expires = 0; 1901 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1902 if (addrconf_finite_timeout(rt_expires)) { 1903 /* not infinity */ 1904 flags |= RTF_EXPIRES; 1905 expires = jiffies_to_clock_t(rt_expires); 1906 } 1907 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1908 dev, expires, flags); 1909 } 1910 if (rt) 1911 dst_release(&rt->dst); 1912 } 1913 1914 /* Try to figure out our local address for this prefix */ 1915 1916 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1917 struct inet6_ifaddr * ifp; 1918 struct in6_addr addr; 1919 int create = 0, update_lft = 0; 1920 1921 if (pinfo->prefix_len == 64) { 1922 memcpy(&addr, &pinfo->prefix, 8); 1923 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1924 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1925 in6_dev_put(in6_dev); 1926 return; 1927 } 1928 goto ok; 1929 } 1930 if (net_ratelimit()) 1931 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1932 pinfo->prefix_len); 1933 in6_dev_put(in6_dev); 1934 return; 1935 1936 ok: 1937 1938 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1939 1940 if (ifp == NULL && valid_lft) { 1941 int max_addresses = in6_dev->cnf.max_addresses; 1942 u32 addr_flags = 0; 1943 1944 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1945 if (in6_dev->cnf.optimistic_dad && 1946 !net->ipv6.devconf_all->forwarding) 1947 addr_flags = IFA_F_OPTIMISTIC; 1948 #endif 1949 1950 /* Do not allow to create too much of autoconfigured 1951 * addresses; this would be too easy way to crash kernel. 1952 */ 1953 if (!max_addresses || 1954 ipv6_count_addresses(in6_dev) < max_addresses) 1955 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1956 addr_type&IPV6_ADDR_SCOPE_MASK, 1957 addr_flags); 1958 1959 if (!ifp || IS_ERR(ifp)) { 1960 in6_dev_put(in6_dev); 1961 return; 1962 } 1963 1964 update_lft = create = 1; 1965 ifp->cstamp = jiffies; 1966 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1967 } 1968 1969 if (ifp) { 1970 int flags; 1971 unsigned long now; 1972 #ifdef CONFIG_IPV6_PRIVACY 1973 struct inet6_ifaddr *ift; 1974 #endif 1975 u32 stored_lft; 1976 1977 /* update lifetime (RFC2462 5.5.3 e) */ 1978 spin_lock(&ifp->lock); 1979 now = jiffies; 1980 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1981 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1982 else 1983 stored_lft = 0; 1984 if (!update_lft && stored_lft) { 1985 if (valid_lft > MIN_VALID_LIFETIME || 1986 valid_lft > stored_lft) 1987 update_lft = 1; 1988 else if (stored_lft <= MIN_VALID_LIFETIME) { 1989 /* valid_lft <= stored_lft is always true */ 1990 /* 1991 * RFC 4862 Section 5.5.3e: 1992 * "Note that the preferred lifetime of 1993 * the corresponding address is always 1994 * reset to the Preferred Lifetime in 1995 * the received Prefix Information 1996 * option, regardless of whether the 1997 * valid lifetime is also reset or 1998 * ignored." 1999 * 2000 * So if the preferred lifetime in 2001 * this advertisement is different 2002 * than what we have stored, but the 2003 * valid lifetime is invalid, just 2004 * reset prefered_lft. 2005 * 2006 * We must set the valid lifetime 2007 * to the stored lifetime since we'll 2008 * be updating the timestamp below, 2009 * else we'll set it back to the 2010 * minimum. 2011 */ 2012 if (prefered_lft != ifp->prefered_lft) { 2013 valid_lft = stored_lft; 2014 update_lft = 1; 2015 } 2016 } else { 2017 valid_lft = MIN_VALID_LIFETIME; 2018 if (valid_lft < prefered_lft) 2019 prefered_lft = valid_lft; 2020 update_lft = 1; 2021 } 2022 } 2023 2024 if (update_lft) { 2025 ifp->valid_lft = valid_lft; 2026 ifp->prefered_lft = prefered_lft; 2027 ifp->tstamp = now; 2028 flags = ifp->flags; 2029 ifp->flags &= ~IFA_F_DEPRECATED; 2030 spin_unlock(&ifp->lock); 2031 2032 if (!(flags&IFA_F_TENTATIVE)) 2033 ipv6_ifa_notify(0, ifp); 2034 } else 2035 spin_unlock(&ifp->lock); 2036 2037 #ifdef CONFIG_IPV6_PRIVACY 2038 read_lock_bh(&in6_dev->lock); 2039 /* update all temporary addresses in the list */ 2040 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2041 tmp_list) { 2042 int age, max_valid, max_prefered; 2043 2044 if (ifp != ift->ifpub) 2045 continue; 2046 2047 /* 2048 * RFC 4941 section 3.3: 2049 * If a received option will extend the lifetime 2050 * of a public address, the lifetimes of 2051 * temporary addresses should be extended, 2052 * subject to the overall constraint that no 2053 * temporary addresses should ever remain 2054 * "valid" or "preferred" for a time longer than 2055 * (TEMP_VALID_LIFETIME) or 2056 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2057 * respectively. 2058 */ 2059 age = (now - ift->cstamp) / HZ; 2060 max_valid = in6_dev->cnf.temp_valid_lft - age; 2061 if (max_valid < 0) 2062 max_valid = 0; 2063 2064 max_prefered = in6_dev->cnf.temp_prefered_lft - 2065 in6_dev->cnf.max_desync_factor - 2066 age; 2067 if (max_prefered < 0) 2068 max_prefered = 0; 2069 2070 if (valid_lft > max_valid) 2071 valid_lft = max_valid; 2072 2073 if (prefered_lft > max_prefered) 2074 prefered_lft = max_prefered; 2075 2076 spin_lock(&ift->lock); 2077 flags = ift->flags; 2078 ift->valid_lft = valid_lft; 2079 ift->prefered_lft = prefered_lft; 2080 ift->tstamp = now; 2081 if (prefered_lft > 0) 2082 ift->flags &= ~IFA_F_DEPRECATED; 2083 2084 spin_unlock(&ift->lock); 2085 if (!(flags&IFA_F_TENTATIVE)) 2086 ipv6_ifa_notify(0, ift); 2087 } 2088 2089 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2090 /* 2091 * When a new public address is created as 2092 * described in [ADDRCONF], also create a new 2093 * temporary address. Also create a temporary 2094 * address if it's enabled but no temporary 2095 * address currently exists. 2096 */ 2097 read_unlock_bh(&in6_dev->lock); 2098 ipv6_create_tempaddr(ifp, NULL); 2099 } else { 2100 read_unlock_bh(&in6_dev->lock); 2101 } 2102 #endif 2103 in6_ifa_put(ifp); 2104 addrconf_verify(0); 2105 } 2106 } 2107 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2108 in6_dev_put(in6_dev); 2109 } 2110 2111 /* 2112 * Set destination address. 2113 * Special case for SIT interfaces where we create a new "virtual" 2114 * device. 2115 */ 2116 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2117 { 2118 struct in6_ifreq ireq; 2119 struct net_device *dev; 2120 int err = -EINVAL; 2121 2122 rtnl_lock(); 2123 2124 err = -EFAULT; 2125 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2126 goto err_exit; 2127 2128 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2129 2130 err = -ENODEV; 2131 if (dev == NULL) 2132 goto err_exit; 2133 2134 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2135 if (dev->type == ARPHRD_SIT) { 2136 const struct net_device_ops *ops = dev->netdev_ops; 2137 struct ifreq ifr; 2138 struct ip_tunnel_parm p; 2139 2140 err = -EADDRNOTAVAIL; 2141 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2142 goto err_exit; 2143 2144 memset(&p, 0, sizeof(p)); 2145 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2146 p.iph.saddr = 0; 2147 p.iph.version = 4; 2148 p.iph.ihl = 5; 2149 p.iph.protocol = IPPROTO_IPV6; 2150 p.iph.ttl = 64; 2151 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2152 2153 if (ops->ndo_do_ioctl) { 2154 mm_segment_t oldfs = get_fs(); 2155 2156 set_fs(KERNEL_DS); 2157 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2158 set_fs(oldfs); 2159 } else 2160 err = -EOPNOTSUPP; 2161 2162 if (err == 0) { 2163 err = -ENOBUFS; 2164 dev = __dev_get_by_name(net, p.name); 2165 if (!dev) 2166 goto err_exit; 2167 err = dev_open(dev); 2168 } 2169 } 2170 #endif 2171 2172 err_exit: 2173 rtnl_unlock(); 2174 return err; 2175 } 2176 2177 /* 2178 * Manual configuration of address on an interface 2179 */ 2180 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2181 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2182 __u32 valid_lft) 2183 { 2184 struct inet6_ifaddr *ifp; 2185 struct inet6_dev *idev; 2186 struct net_device *dev; 2187 int scope; 2188 u32 flags; 2189 clock_t expires; 2190 unsigned long timeout; 2191 2192 ASSERT_RTNL(); 2193 2194 if (plen > 128) 2195 return -EINVAL; 2196 2197 /* check the lifetime */ 2198 if (!valid_lft || prefered_lft > valid_lft) 2199 return -EINVAL; 2200 2201 dev = __dev_get_by_index(net, ifindex); 2202 if (!dev) 2203 return -ENODEV; 2204 2205 idev = addrconf_add_dev(dev); 2206 if (IS_ERR(idev)) 2207 return PTR_ERR(idev); 2208 2209 scope = ipv6_addr_scope(pfx); 2210 2211 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2212 if (addrconf_finite_timeout(timeout)) { 2213 expires = jiffies_to_clock_t(timeout * HZ); 2214 valid_lft = timeout; 2215 flags = RTF_EXPIRES; 2216 } else { 2217 expires = 0; 2218 flags = 0; 2219 ifa_flags |= IFA_F_PERMANENT; 2220 } 2221 2222 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2223 if (addrconf_finite_timeout(timeout)) { 2224 if (timeout == 0) 2225 ifa_flags |= IFA_F_DEPRECATED; 2226 prefered_lft = timeout; 2227 } 2228 2229 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2230 2231 if (!IS_ERR(ifp)) { 2232 spin_lock_bh(&ifp->lock); 2233 ifp->valid_lft = valid_lft; 2234 ifp->prefered_lft = prefered_lft; 2235 ifp->tstamp = jiffies; 2236 spin_unlock_bh(&ifp->lock); 2237 2238 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2239 expires, flags); 2240 /* 2241 * Note that section 3.1 of RFC 4429 indicates 2242 * that the Optimistic flag should not be set for 2243 * manually configured addresses 2244 */ 2245 addrconf_dad_start(ifp, 0); 2246 in6_ifa_put(ifp); 2247 addrconf_verify(0); 2248 return 0; 2249 } 2250 2251 return PTR_ERR(ifp); 2252 } 2253 2254 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2255 unsigned int plen) 2256 { 2257 struct inet6_ifaddr *ifp; 2258 struct inet6_dev *idev; 2259 struct net_device *dev; 2260 2261 if (plen > 128) 2262 return -EINVAL; 2263 2264 dev = __dev_get_by_index(net, ifindex); 2265 if (!dev) 2266 return -ENODEV; 2267 2268 if ((idev = __in6_dev_get(dev)) == NULL) 2269 return -ENXIO; 2270 2271 read_lock_bh(&idev->lock); 2272 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2273 if (ifp->prefix_len == plen && 2274 ipv6_addr_equal(pfx, &ifp->addr)) { 2275 in6_ifa_hold(ifp); 2276 read_unlock_bh(&idev->lock); 2277 2278 ipv6_del_addr(ifp); 2279 2280 /* If the last address is deleted administratively, 2281 disable IPv6 on this interface. 2282 */ 2283 if (list_empty(&idev->addr_list)) 2284 addrconf_ifdown(idev->dev, 1); 2285 return 0; 2286 } 2287 } 2288 read_unlock_bh(&idev->lock); 2289 return -EADDRNOTAVAIL; 2290 } 2291 2292 2293 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2294 { 2295 struct in6_ifreq ireq; 2296 int err; 2297 2298 if (!capable(CAP_NET_ADMIN)) 2299 return -EPERM; 2300 2301 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2302 return -EFAULT; 2303 2304 rtnl_lock(); 2305 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2306 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2307 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2308 rtnl_unlock(); 2309 return err; 2310 } 2311 2312 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2313 { 2314 struct in6_ifreq ireq; 2315 int err; 2316 2317 if (!capable(CAP_NET_ADMIN)) 2318 return -EPERM; 2319 2320 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2321 return -EFAULT; 2322 2323 rtnl_lock(); 2324 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2325 ireq.ifr6_prefixlen); 2326 rtnl_unlock(); 2327 return err; 2328 } 2329 2330 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2331 int plen, int scope) 2332 { 2333 struct inet6_ifaddr *ifp; 2334 2335 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2336 if (!IS_ERR(ifp)) { 2337 spin_lock_bh(&ifp->lock); 2338 ifp->flags &= ~IFA_F_TENTATIVE; 2339 spin_unlock_bh(&ifp->lock); 2340 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2341 in6_ifa_put(ifp); 2342 } 2343 } 2344 2345 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2346 static void sit_add_v4_addrs(struct inet6_dev *idev) 2347 { 2348 struct in6_addr addr; 2349 struct net_device *dev; 2350 struct net *net = dev_net(idev->dev); 2351 int scope; 2352 2353 ASSERT_RTNL(); 2354 2355 memset(&addr, 0, sizeof(struct in6_addr)); 2356 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2357 2358 if (idev->dev->flags&IFF_POINTOPOINT) { 2359 addr.s6_addr32[0] = htonl(0xfe800000); 2360 scope = IFA_LINK; 2361 } else { 2362 scope = IPV6_ADDR_COMPATv4; 2363 } 2364 2365 if (addr.s6_addr32[3]) { 2366 add_addr(idev, &addr, 128, scope); 2367 return; 2368 } 2369 2370 for_each_netdev(net, dev) { 2371 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2372 if (in_dev && (dev->flags & IFF_UP)) { 2373 struct in_ifaddr * ifa; 2374 2375 int flag = scope; 2376 2377 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2378 int plen; 2379 2380 addr.s6_addr32[3] = ifa->ifa_local; 2381 2382 if (ifa->ifa_scope == RT_SCOPE_LINK) 2383 continue; 2384 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2385 if (idev->dev->flags&IFF_POINTOPOINT) 2386 continue; 2387 flag |= IFA_HOST; 2388 } 2389 if (idev->dev->flags&IFF_POINTOPOINT) 2390 plen = 64; 2391 else 2392 plen = 96; 2393 2394 add_addr(idev, &addr, plen, flag); 2395 } 2396 } 2397 } 2398 } 2399 #endif 2400 2401 static void init_loopback(struct net_device *dev) 2402 { 2403 struct inet6_dev *idev; 2404 2405 /* ::1 */ 2406 2407 ASSERT_RTNL(); 2408 2409 if ((idev = ipv6_find_idev(dev)) == NULL) { 2410 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2411 return; 2412 } 2413 2414 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2415 } 2416 2417 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2418 { 2419 struct inet6_ifaddr * ifp; 2420 u32 addr_flags = IFA_F_PERMANENT; 2421 2422 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2423 if (idev->cnf.optimistic_dad && 2424 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2425 addr_flags |= IFA_F_OPTIMISTIC; 2426 #endif 2427 2428 2429 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2430 if (!IS_ERR(ifp)) { 2431 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2432 addrconf_dad_start(ifp, 0); 2433 in6_ifa_put(ifp); 2434 } 2435 } 2436 2437 static void addrconf_dev_config(struct net_device *dev) 2438 { 2439 struct in6_addr addr; 2440 struct inet6_dev * idev; 2441 2442 ASSERT_RTNL(); 2443 2444 if ((dev->type != ARPHRD_ETHER) && 2445 (dev->type != ARPHRD_FDDI) && 2446 (dev->type != ARPHRD_IEEE802_TR) && 2447 (dev->type != ARPHRD_ARCNET) && 2448 (dev->type != ARPHRD_INFINIBAND)) { 2449 /* Alas, we support only Ethernet autoconfiguration. */ 2450 return; 2451 } 2452 2453 idev = addrconf_add_dev(dev); 2454 if (IS_ERR(idev)) 2455 return; 2456 2457 memset(&addr, 0, sizeof(struct in6_addr)); 2458 addr.s6_addr32[0] = htonl(0xFE800000); 2459 2460 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2461 addrconf_add_linklocal(idev, &addr); 2462 } 2463 2464 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2465 static void addrconf_sit_config(struct net_device *dev) 2466 { 2467 struct inet6_dev *idev; 2468 2469 ASSERT_RTNL(); 2470 2471 /* 2472 * Configure the tunnel with one of our IPv4 2473 * addresses... we should configure all of 2474 * our v4 addrs in the tunnel 2475 */ 2476 2477 if ((idev = ipv6_find_idev(dev)) == NULL) { 2478 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2479 return; 2480 } 2481 2482 if (dev->priv_flags & IFF_ISATAP) { 2483 struct in6_addr addr; 2484 2485 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2486 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2487 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2488 addrconf_add_linklocal(idev, &addr); 2489 return; 2490 } 2491 2492 sit_add_v4_addrs(idev); 2493 2494 if (dev->flags&IFF_POINTOPOINT) { 2495 addrconf_add_mroute(dev); 2496 addrconf_add_lroute(dev); 2497 } else 2498 sit_route_add(dev); 2499 } 2500 #endif 2501 2502 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2503 static void addrconf_gre_config(struct net_device *dev) 2504 { 2505 struct inet6_dev *idev; 2506 struct in6_addr addr; 2507 2508 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name); 2509 2510 ASSERT_RTNL(); 2511 2512 if ((idev = ipv6_find_idev(dev)) == NULL) { 2513 printk(KERN_DEBUG "init gre: add_dev failed\n"); 2514 return; 2515 } 2516 2517 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2518 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2519 2520 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2521 addrconf_add_linklocal(idev, &addr); 2522 } 2523 #endif 2524 2525 static inline int 2526 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2527 { 2528 struct in6_addr lladdr; 2529 2530 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2531 addrconf_add_linklocal(idev, &lladdr); 2532 return 0; 2533 } 2534 return -1; 2535 } 2536 2537 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2538 { 2539 struct net_device *link_dev; 2540 struct net *net = dev_net(idev->dev); 2541 2542 /* first try to inherit the link-local address from the link device */ 2543 if (idev->dev->iflink && 2544 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2545 if (!ipv6_inherit_linklocal(idev, link_dev)) 2546 return; 2547 } 2548 /* then try to inherit it from any device */ 2549 for_each_netdev(net, link_dev) { 2550 if (!ipv6_inherit_linklocal(idev, link_dev)) 2551 return; 2552 } 2553 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2554 } 2555 2556 /* 2557 * Autoconfigure tunnel with a link-local address so routing protocols, 2558 * DHCPv6, MLD etc. can be run over the virtual link 2559 */ 2560 2561 static void addrconf_ip6_tnl_config(struct net_device *dev) 2562 { 2563 struct inet6_dev *idev; 2564 2565 ASSERT_RTNL(); 2566 2567 idev = addrconf_add_dev(dev); 2568 if (IS_ERR(idev)) { 2569 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2570 return; 2571 } 2572 ip6_tnl_add_linklocal(idev); 2573 } 2574 2575 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2576 void * data) 2577 { 2578 struct net_device *dev = (struct net_device *) data; 2579 struct inet6_dev *idev = __in6_dev_get(dev); 2580 int run_pending = 0; 2581 int err; 2582 2583 switch (event) { 2584 case NETDEV_REGISTER: 2585 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2586 idev = ipv6_add_dev(dev); 2587 if (!idev) 2588 return notifier_from_errno(-ENOMEM); 2589 } 2590 break; 2591 2592 case NETDEV_UP: 2593 case NETDEV_CHANGE: 2594 if (dev->flags & IFF_SLAVE) 2595 break; 2596 2597 if (event == NETDEV_UP) { 2598 if (!addrconf_qdisc_ok(dev)) { 2599 /* device is not ready yet. */ 2600 printk(KERN_INFO 2601 "ADDRCONF(NETDEV_UP): %s: " 2602 "link is not ready\n", 2603 dev->name); 2604 break; 2605 } 2606 2607 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2608 idev = ipv6_add_dev(dev); 2609 2610 if (idev) { 2611 idev->if_flags |= IF_READY; 2612 run_pending = 1; 2613 } 2614 } else { 2615 if (!addrconf_qdisc_ok(dev)) { 2616 /* device is still not ready. */ 2617 break; 2618 } 2619 2620 if (idev) { 2621 if (idev->if_flags & IF_READY) 2622 /* device is already configured. */ 2623 break; 2624 idev->if_flags |= IF_READY; 2625 } 2626 2627 printk(KERN_INFO 2628 "ADDRCONF(NETDEV_CHANGE): %s: " 2629 "link becomes ready\n", 2630 dev->name); 2631 2632 run_pending = 1; 2633 } 2634 2635 switch (dev->type) { 2636 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2637 case ARPHRD_SIT: 2638 addrconf_sit_config(dev); 2639 break; 2640 #endif 2641 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2642 case ARPHRD_IPGRE: 2643 addrconf_gre_config(dev); 2644 break; 2645 #endif 2646 case ARPHRD_TUNNEL6: 2647 addrconf_ip6_tnl_config(dev); 2648 break; 2649 case ARPHRD_LOOPBACK: 2650 init_loopback(dev); 2651 break; 2652 2653 default: 2654 addrconf_dev_config(dev); 2655 break; 2656 } 2657 2658 if (idev) { 2659 if (run_pending) 2660 addrconf_dad_run(idev); 2661 2662 /* 2663 * If the MTU changed during the interface down, 2664 * when the interface up, the changed MTU must be 2665 * reflected in the idev as well as routers. 2666 */ 2667 if (idev->cnf.mtu6 != dev->mtu && 2668 dev->mtu >= IPV6_MIN_MTU) { 2669 rt6_mtu_change(dev, dev->mtu); 2670 idev->cnf.mtu6 = dev->mtu; 2671 } 2672 idev->tstamp = jiffies; 2673 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2674 2675 /* 2676 * If the changed mtu during down is lower than 2677 * IPV6_MIN_MTU stop IPv6 on this interface. 2678 */ 2679 if (dev->mtu < IPV6_MIN_MTU) 2680 addrconf_ifdown(dev, 1); 2681 } 2682 break; 2683 2684 case NETDEV_CHANGEMTU: 2685 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2686 rt6_mtu_change(dev, dev->mtu); 2687 idev->cnf.mtu6 = dev->mtu; 2688 break; 2689 } 2690 2691 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2692 idev = ipv6_add_dev(dev); 2693 if (idev) 2694 break; 2695 } 2696 2697 /* 2698 * MTU falled under IPV6_MIN_MTU. 2699 * Stop IPv6 on this interface. 2700 */ 2701 2702 case NETDEV_DOWN: 2703 case NETDEV_UNREGISTER: 2704 /* 2705 * Remove all addresses from this interface. 2706 */ 2707 addrconf_ifdown(dev, event != NETDEV_DOWN); 2708 break; 2709 2710 case NETDEV_CHANGENAME: 2711 if (idev) { 2712 snmp6_unregister_dev(idev); 2713 addrconf_sysctl_unregister(idev); 2714 addrconf_sysctl_register(idev); 2715 err = snmp6_register_dev(idev); 2716 if (err) 2717 return notifier_from_errno(err); 2718 } 2719 break; 2720 2721 case NETDEV_PRE_TYPE_CHANGE: 2722 case NETDEV_POST_TYPE_CHANGE: 2723 addrconf_type_change(dev, event); 2724 break; 2725 } 2726 2727 return NOTIFY_OK; 2728 } 2729 2730 /* 2731 * addrconf module should be notified of a device going up 2732 */ 2733 static struct notifier_block ipv6_dev_notf = { 2734 .notifier_call = addrconf_notify, 2735 }; 2736 2737 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2738 { 2739 struct inet6_dev *idev; 2740 ASSERT_RTNL(); 2741 2742 idev = __in6_dev_get(dev); 2743 2744 if (event == NETDEV_POST_TYPE_CHANGE) 2745 ipv6_mc_remap(idev); 2746 else if (event == NETDEV_PRE_TYPE_CHANGE) 2747 ipv6_mc_unmap(idev); 2748 } 2749 2750 static int addrconf_ifdown(struct net_device *dev, int how) 2751 { 2752 struct net *net = dev_net(dev); 2753 struct inet6_dev *idev; 2754 struct inet6_ifaddr *ifa; 2755 int state, i; 2756 2757 ASSERT_RTNL(); 2758 2759 rt6_ifdown(net, dev); 2760 neigh_ifdown(&nd_tbl, dev); 2761 2762 idev = __in6_dev_get(dev); 2763 if (idev == NULL) 2764 return -ENODEV; 2765 2766 /* 2767 * Step 1: remove reference to ipv6 device from parent device. 2768 * Do not dev_put! 2769 */ 2770 if (how) { 2771 idev->dead = 1; 2772 2773 /* protected by rtnl_lock */ 2774 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2775 2776 /* Step 1.5: remove snmp6 entry */ 2777 snmp6_unregister_dev(idev); 2778 2779 } 2780 2781 /* Step 2: clear hash table */ 2782 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2783 struct hlist_head *h = &inet6_addr_lst[i]; 2784 struct hlist_node *n; 2785 2786 spin_lock_bh(&addrconf_hash_lock); 2787 restart: 2788 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2789 if (ifa->idev == idev) { 2790 hlist_del_init_rcu(&ifa->addr_lst); 2791 addrconf_del_timer(ifa); 2792 goto restart; 2793 } 2794 } 2795 spin_unlock_bh(&addrconf_hash_lock); 2796 } 2797 2798 write_lock_bh(&idev->lock); 2799 2800 /* Step 2: clear flags for stateless addrconf */ 2801 if (!how) 2802 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2803 2804 #ifdef CONFIG_IPV6_PRIVACY 2805 if (how && del_timer(&idev->regen_timer)) 2806 in6_dev_put(idev); 2807 2808 /* Step 3: clear tempaddr list */ 2809 while (!list_empty(&idev->tempaddr_list)) { 2810 ifa = list_first_entry(&idev->tempaddr_list, 2811 struct inet6_ifaddr, tmp_list); 2812 list_del(&ifa->tmp_list); 2813 write_unlock_bh(&idev->lock); 2814 spin_lock_bh(&ifa->lock); 2815 2816 if (ifa->ifpub) { 2817 in6_ifa_put(ifa->ifpub); 2818 ifa->ifpub = NULL; 2819 } 2820 spin_unlock_bh(&ifa->lock); 2821 in6_ifa_put(ifa); 2822 write_lock_bh(&idev->lock); 2823 } 2824 #endif 2825 2826 while (!list_empty(&idev->addr_list)) { 2827 ifa = list_first_entry(&idev->addr_list, 2828 struct inet6_ifaddr, if_list); 2829 addrconf_del_timer(ifa); 2830 2831 list_del(&ifa->if_list); 2832 2833 write_unlock_bh(&idev->lock); 2834 2835 spin_lock_bh(&ifa->state_lock); 2836 state = ifa->state; 2837 ifa->state = INET6_IFADDR_STATE_DEAD; 2838 spin_unlock_bh(&ifa->state_lock); 2839 2840 if (state != INET6_IFADDR_STATE_DEAD) { 2841 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2842 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2843 } 2844 in6_ifa_put(ifa); 2845 2846 write_lock_bh(&idev->lock); 2847 } 2848 2849 write_unlock_bh(&idev->lock); 2850 2851 /* Step 5: Discard multicast list */ 2852 if (how) 2853 ipv6_mc_destroy_dev(idev); 2854 else 2855 ipv6_mc_down(idev); 2856 2857 idev->tstamp = jiffies; 2858 2859 /* Last: Shot the device (if unregistered) */ 2860 if (how) { 2861 addrconf_sysctl_unregister(idev); 2862 neigh_parms_release(&nd_tbl, idev->nd_parms); 2863 neigh_ifdown(&nd_tbl, dev); 2864 in6_dev_put(idev); 2865 } 2866 return 0; 2867 } 2868 2869 static void addrconf_rs_timer(unsigned long data) 2870 { 2871 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2872 struct inet6_dev *idev = ifp->idev; 2873 2874 read_lock(&idev->lock); 2875 if (idev->dead || !(idev->if_flags & IF_READY)) 2876 goto out; 2877 2878 if (idev->cnf.forwarding) 2879 goto out; 2880 2881 /* Announcement received after solicitation was sent */ 2882 if (idev->if_flags & IF_RA_RCVD) 2883 goto out; 2884 2885 spin_lock(&ifp->lock); 2886 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2887 /* The wait after the last probe can be shorter */ 2888 addrconf_mod_timer(ifp, AC_RS, 2889 (ifp->probes == idev->cnf.rtr_solicits) ? 2890 idev->cnf.rtr_solicit_delay : 2891 idev->cnf.rtr_solicit_interval); 2892 spin_unlock(&ifp->lock); 2893 2894 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2895 } else { 2896 spin_unlock(&ifp->lock); 2897 /* 2898 * Note: we do not support deprecated "all on-link" 2899 * assumption any longer. 2900 */ 2901 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2902 idev->dev->name); 2903 } 2904 2905 out: 2906 read_unlock(&idev->lock); 2907 in6_ifa_put(ifp); 2908 } 2909 2910 /* 2911 * Duplicate Address Detection 2912 */ 2913 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2914 { 2915 unsigned long rand_num; 2916 struct inet6_dev *idev = ifp->idev; 2917 2918 if (ifp->flags & IFA_F_OPTIMISTIC) 2919 rand_num = 0; 2920 else 2921 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2922 2923 ifp->probes = idev->cnf.dad_transmits; 2924 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2925 } 2926 2927 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2928 { 2929 struct inet6_dev *idev = ifp->idev; 2930 struct net_device *dev = idev->dev; 2931 2932 addrconf_join_solict(dev, &ifp->addr); 2933 2934 net_srandom(ifp->addr.s6_addr32[3]); 2935 2936 read_lock_bh(&idev->lock); 2937 spin_lock(&ifp->lock); 2938 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2939 goto out; 2940 2941 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2942 idev->cnf.accept_dad < 1 || 2943 !(ifp->flags&IFA_F_TENTATIVE) || 2944 ifp->flags & IFA_F_NODAD) { 2945 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2946 spin_unlock(&ifp->lock); 2947 read_unlock_bh(&idev->lock); 2948 2949 addrconf_dad_completed(ifp); 2950 return; 2951 } 2952 2953 if (!(idev->if_flags & IF_READY)) { 2954 spin_unlock(&ifp->lock); 2955 read_unlock_bh(&idev->lock); 2956 /* 2957 * If the device is not ready: 2958 * - keep it tentative if it is a permanent address. 2959 * - otherwise, kill it. 2960 */ 2961 in6_ifa_hold(ifp); 2962 addrconf_dad_stop(ifp, 0); 2963 return; 2964 } 2965 2966 /* 2967 * Optimistic nodes can start receiving 2968 * Frames right away 2969 */ 2970 if (ifp->flags & IFA_F_OPTIMISTIC) 2971 ip6_ins_rt(ifp->rt); 2972 2973 addrconf_dad_kick(ifp); 2974 out: 2975 spin_unlock(&ifp->lock); 2976 read_unlock_bh(&idev->lock); 2977 } 2978 2979 static void addrconf_dad_timer(unsigned long data) 2980 { 2981 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2982 struct inet6_dev *idev = ifp->idev; 2983 struct in6_addr mcaddr; 2984 2985 if (!ifp->probes && addrconf_dad_end(ifp)) 2986 goto out; 2987 2988 read_lock(&idev->lock); 2989 if (idev->dead || !(idev->if_flags & IF_READY)) { 2990 read_unlock(&idev->lock); 2991 goto out; 2992 } 2993 2994 spin_lock(&ifp->lock); 2995 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2996 spin_unlock(&ifp->lock); 2997 read_unlock(&idev->lock); 2998 goto out; 2999 } 3000 3001 if (ifp->probes == 0) { 3002 /* 3003 * DAD was successful 3004 */ 3005 3006 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3007 spin_unlock(&ifp->lock); 3008 read_unlock(&idev->lock); 3009 3010 addrconf_dad_completed(ifp); 3011 3012 goto out; 3013 } 3014 3015 ifp->probes--; 3016 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3017 spin_unlock(&ifp->lock); 3018 read_unlock(&idev->lock); 3019 3020 /* send a neighbour solicitation for our addr */ 3021 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3022 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3023 out: 3024 in6_ifa_put(ifp); 3025 } 3026 3027 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3028 { 3029 struct net_device *dev = ifp->idev->dev; 3030 3031 /* 3032 * Configure the address for reception. Now it is valid. 3033 */ 3034 3035 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3036 3037 /* If added prefix is link local and we are prepared to process 3038 router advertisements, start sending router solicitations. 3039 */ 3040 3041 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) || 3042 ifp->idev->cnf.accept_ra == 2) && 3043 ifp->idev->cnf.rtr_solicits > 0 && 3044 (dev->flags&IFF_LOOPBACK) == 0 && 3045 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3046 /* 3047 * If a host as already performed a random delay 3048 * [...] as part of DAD [...] there is no need 3049 * to delay again before sending the first RS 3050 */ 3051 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3052 3053 spin_lock_bh(&ifp->lock); 3054 ifp->probes = 1; 3055 ifp->idev->if_flags |= IF_RS_SENT; 3056 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3057 spin_unlock_bh(&ifp->lock); 3058 } 3059 } 3060 3061 static void addrconf_dad_run(struct inet6_dev *idev) 3062 { 3063 struct inet6_ifaddr *ifp; 3064 3065 read_lock_bh(&idev->lock); 3066 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3067 spin_lock(&ifp->lock); 3068 if (ifp->flags & IFA_F_TENTATIVE && 3069 ifp->state == INET6_IFADDR_STATE_DAD) 3070 addrconf_dad_kick(ifp); 3071 spin_unlock(&ifp->lock); 3072 } 3073 read_unlock_bh(&idev->lock); 3074 } 3075 3076 #ifdef CONFIG_PROC_FS 3077 struct if6_iter_state { 3078 struct seq_net_private p; 3079 int bucket; 3080 }; 3081 3082 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 3083 { 3084 struct inet6_ifaddr *ifa = NULL; 3085 struct if6_iter_state *state = seq->private; 3086 struct net *net = seq_file_net(seq); 3087 3088 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3089 struct hlist_node *n; 3090 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3091 addr_lst) 3092 if (net_eq(dev_net(ifa->idev->dev), net)) 3093 return ifa; 3094 } 3095 return NULL; 3096 } 3097 3098 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3099 struct inet6_ifaddr *ifa) 3100 { 3101 struct if6_iter_state *state = seq->private; 3102 struct net *net = seq_file_net(seq); 3103 struct hlist_node *n = &ifa->addr_lst; 3104 3105 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) 3106 if (net_eq(dev_net(ifa->idev->dev), net)) 3107 return ifa; 3108 3109 while (++state->bucket < IN6_ADDR_HSIZE) { 3110 hlist_for_each_entry_rcu_bh(ifa, n, 3111 &inet6_addr_lst[state->bucket], addr_lst) { 3112 if (net_eq(dev_net(ifa->idev->dev), net)) 3113 return ifa; 3114 } 3115 } 3116 3117 return NULL; 3118 } 3119 3120 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3121 { 3122 struct inet6_ifaddr *ifa = if6_get_first(seq); 3123 3124 if (ifa) 3125 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3126 --pos; 3127 return pos ? NULL : ifa; 3128 } 3129 3130 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3131 __acquires(rcu_bh) 3132 { 3133 rcu_read_lock_bh(); 3134 return if6_get_idx(seq, *pos); 3135 } 3136 3137 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3138 { 3139 struct inet6_ifaddr *ifa; 3140 3141 ifa = if6_get_next(seq, v); 3142 ++*pos; 3143 return ifa; 3144 } 3145 3146 static void if6_seq_stop(struct seq_file *seq, void *v) 3147 __releases(rcu_bh) 3148 { 3149 rcu_read_unlock_bh(); 3150 } 3151 3152 static int if6_seq_show(struct seq_file *seq, void *v) 3153 { 3154 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3155 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3156 &ifp->addr, 3157 ifp->idev->dev->ifindex, 3158 ifp->prefix_len, 3159 ifp->scope, 3160 ifp->flags, 3161 ifp->idev->dev->name); 3162 return 0; 3163 } 3164 3165 static const struct seq_operations if6_seq_ops = { 3166 .start = if6_seq_start, 3167 .next = if6_seq_next, 3168 .show = if6_seq_show, 3169 .stop = if6_seq_stop, 3170 }; 3171 3172 static int if6_seq_open(struct inode *inode, struct file *file) 3173 { 3174 return seq_open_net(inode, file, &if6_seq_ops, 3175 sizeof(struct if6_iter_state)); 3176 } 3177 3178 static const struct file_operations if6_fops = { 3179 .owner = THIS_MODULE, 3180 .open = if6_seq_open, 3181 .read = seq_read, 3182 .llseek = seq_lseek, 3183 .release = seq_release_net, 3184 }; 3185 3186 static int __net_init if6_proc_net_init(struct net *net) 3187 { 3188 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3189 return -ENOMEM; 3190 return 0; 3191 } 3192 3193 static void __net_exit if6_proc_net_exit(struct net *net) 3194 { 3195 proc_net_remove(net, "if_inet6"); 3196 } 3197 3198 static struct pernet_operations if6_proc_net_ops = { 3199 .init = if6_proc_net_init, 3200 .exit = if6_proc_net_exit, 3201 }; 3202 3203 int __init if6_proc_init(void) 3204 { 3205 return register_pernet_subsys(&if6_proc_net_ops); 3206 } 3207 3208 void if6_proc_exit(void) 3209 { 3210 unregister_pernet_subsys(&if6_proc_net_ops); 3211 } 3212 #endif /* CONFIG_PROC_FS */ 3213 3214 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3215 /* Check if address is a home address configured on any interface. */ 3216 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3217 { 3218 int ret = 0; 3219 struct inet6_ifaddr *ifp = NULL; 3220 struct hlist_node *n; 3221 unsigned int hash = ipv6_addr_hash(addr); 3222 3223 rcu_read_lock_bh(); 3224 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3225 if (!net_eq(dev_net(ifp->idev->dev), net)) 3226 continue; 3227 if (ipv6_addr_equal(&ifp->addr, addr) && 3228 (ifp->flags & IFA_F_HOMEADDRESS)) { 3229 ret = 1; 3230 break; 3231 } 3232 } 3233 rcu_read_unlock_bh(); 3234 return ret; 3235 } 3236 #endif 3237 3238 /* 3239 * Periodic address status verification 3240 */ 3241 3242 static void addrconf_verify(unsigned long foo) 3243 { 3244 unsigned long now, next, next_sec, next_sched; 3245 struct inet6_ifaddr *ifp; 3246 struct hlist_node *node; 3247 int i; 3248 3249 rcu_read_lock_bh(); 3250 spin_lock(&addrconf_verify_lock); 3251 now = jiffies; 3252 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3253 3254 del_timer(&addr_chk_timer); 3255 3256 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3257 restart: 3258 hlist_for_each_entry_rcu_bh(ifp, node, 3259 &inet6_addr_lst[i], addr_lst) { 3260 unsigned long age; 3261 3262 if (ifp->flags & IFA_F_PERMANENT) 3263 continue; 3264 3265 spin_lock(&ifp->lock); 3266 /* We try to batch several events at once. */ 3267 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3268 3269 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3270 age >= ifp->valid_lft) { 3271 spin_unlock(&ifp->lock); 3272 in6_ifa_hold(ifp); 3273 ipv6_del_addr(ifp); 3274 goto restart; 3275 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3276 spin_unlock(&ifp->lock); 3277 continue; 3278 } else if (age >= ifp->prefered_lft) { 3279 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3280 int deprecate = 0; 3281 3282 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3283 deprecate = 1; 3284 ifp->flags |= IFA_F_DEPRECATED; 3285 } 3286 3287 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3288 next = ifp->tstamp + ifp->valid_lft * HZ; 3289 3290 spin_unlock(&ifp->lock); 3291 3292 if (deprecate) { 3293 in6_ifa_hold(ifp); 3294 3295 ipv6_ifa_notify(0, ifp); 3296 in6_ifa_put(ifp); 3297 goto restart; 3298 } 3299 #ifdef CONFIG_IPV6_PRIVACY 3300 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3301 !(ifp->flags&IFA_F_TENTATIVE)) { 3302 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3303 ifp->idev->cnf.dad_transmits * 3304 ifp->idev->nd_parms->retrans_time / HZ; 3305 3306 if (age >= ifp->prefered_lft - regen_advance) { 3307 struct inet6_ifaddr *ifpub = ifp->ifpub; 3308 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3309 next = ifp->tstamp + ifp->prefered_lft * HZ; 3310 if (!ifp->regen_count && ifpub) { 3311 ifp->regen_count++; 3312 in6_ifa_hold(ifp); 3313 in6_ifa_hold(ifpub); 3314 spin_unlock(&ifp->lock); 3315 3316 spin_lock(&ifpub->lock); 3317 ifpub->regen_count = 0; 3318 spin_unlock(&ifpub->lock); 3319 ipv6_create_tempaddr(ifpub, ifp); 3320 in6_ifa_put(ifpub); 3321 in6_ifa_put(ifp); 3322 goto restart; 3323 } 3324 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3325 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3326 spin_unlock(&ifp->lock); 3327 #endif 3328 } else { 3329 /* ifp->prefered_lft <= ifp->valid_lft */ 3330 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3331 next = ifp->tstamp + ifp->prefered_lft * HZ; 3332 spin_unlock(&ifp->lock); 3333 } 3334 } 3335 } 3336 3337 next_sec = round_jiffies_up(next); 3338 next_sched = next; 3339 3340 /* If rounded timeout is accurate enough, accept it. */ 3341 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3342 next_sched = next_sec; 3343 3344 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3345 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3346 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3347 3348 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3349 now, next, next_sec, next_sched)); 3350 3351 addr_chk_timer.expires = next_sched; 3352 add_timer(&addr_chk_timer); 3353 spin_unlock(&addrconf_verify_lock); 3354 rcu_read_unlock_bh(); 3355 } 3356 3357 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3358 { 3359 struct in6_addr *pfx = NULL; 3360 3361 if (addr) 3362 pfx = nla_data(addr); 3363 3364 if (local) { 3365 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3366 pfx = NULL; 3367 else 3368 pfx = nla_data(local); 3369 } 3370 3371 return pfx; 3372 } 3373 3374 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3375 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3376 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3377 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3378 }; 3379 3380 static int 3381 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3382 { 3383 struct net *net = sock_net(skb->sk); 3384 struct ifaddrmsg *ifm; 3385 struct nlattr *tb[IFA_MAX+1]; 3386 struct in6_addr *pfx; 3387 int err; 3388 3389 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3390 if (err < 0) 3391 return err; 3392 3393 ifm = nlmsg_data(nlh); 3394 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3395 if (pfx == NULL) 3396 return -EINVAL; 3397 3398 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3399 } 3400 3401 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3402 u32 prefered_lft, u32 valid_lft) 3403 { 3404 u32 flags; 3405 clock_t expires; 3406 unsigned long timeout; 3407 3408 if (!valid_lft || (prefered_lft > valid_lft)) 3409 return -EINVAL; 3410 3411 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3412 if (addrconf_finite_timeout(timeout)) { 3413 expires = jiffies_to_clock_t(timeout * HZ); 3414 valid_lft = timeout; 3415 flags = RTF_EXPIRES; 3416 } else { 3417 expires = 0; 3418 flags = 0; 3419 ifa_flags |= IFA_F_PERMANENT; 3420 } 3421 3422 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3423 if (addrconf_finite_timeout(timeout)) { 3424 if (timeout == 0) 3425 ifa_flags |= IFA_F_DEPRECATED; 3426 prefered_lft = timeout; 3427 } 3428 3429 spin_lock_bh(&ifp->lock); 3430 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3431 ifp->tstamp = jiffies; 3432 ifp->valid_lft = valid_lft; 3433 ifp->prefered_lft = prefered_lft; 3434 3435 spin_unlock_bh(&ifp->lock); 3436 if (!(ifp->flags&IFA_F_TENTATIVE)) 3437 ipv6_ifa_notify(0, ifp); 3438 3439 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3440 expires, flags); 3441 addrconf_verify(0); 3442 3443 return 0; 3444 } 3445 3446 static int 3447 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3448 { 3449 struct net *net = sock_net(skb->sk); 3450 struct ifaddrmsg *ifm; 3451 struct nlattr *tb[IFA_MAX+1]; 3452 struct in6_addr *pfx; 3453 struct inet6_ifaddr *ifa; 3454 struct net_device *dev; 3455 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3456 u8 ifa_flags; 3457 int err; 3458 3459 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3460 if (err < 0) 3461 return err; 3462 3463 ifm = nlmsg_data(nlh); 3464 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3465 if (pfx == NULL) 3466 return -EINVAL; 3467 3468 if (tb[IFA_CACHEINFO]) { 3469 struct ifa_cacheinfo *ci; 3470 3471 ci = nla_data(tb[IFA_CACHEINFO]); 3472 valid_lft = ci->ifa_valid; 3473 preferred_lft = ci->ifa_prefered; 3474 } else { 3475 preferred_lft = INFINITY_LIFE_TIME; 3476 valid_lft = INFINITY_LIFE_TIME; 3477 } 3478 3479 dev = __dev_get_by_index(net, ifm->ifa_index); 3480 if (dev == NULL) 3481 return -ENODEV; 3482 3483 /* We ignore other flags so far. */ 3484 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3485 3486 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3487 if (ifa == NULL) { 3488 /* 3489 * It would be best to check for !NLM_F_CREATE here but 3490 * userspace alreay relies on not having to provide this. 3491 */ 3492 return inet6_addr_add(net, ifm->ifa_index, pfx, 3493 ifm->ifa_prefixlen, ifa_flags, 3494 preferred_lft, valid_lft); 3495 } 3496 3497 if (nlh->nlmsg_flags & NLM_F_EXCL || 3498 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3499 err = -EEXIST; 3500 else 3501 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3502 3503 in6_ifa_put(ifa); 3504 3505 return err; 3506 } 3507 3508 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3509 u8 scope, int ifindex) 3510 { 3511 struct ifaddrmsg *ifm; 3512 3513 ifm = nlmsg_data(nlh); 3514 ifm->ifa_family = AF_INET6; 3515 ifm->ifa_prefixlen = prefixlen; 3516 ifm->ifa_flags = flags; 3517 ifm->ifa_scope = scope; 3518 ifm->ifa_index = ifindex; 3519 } 3520 3521 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3522 unsigned long tstamp, u32 preferred, u32 valid) 3523 { 3524 struct ifa_cacheinfo ci; 3525 3526 ci.cstamp = cstamp_delta(cstamp); 3527 ci.tstamp = cstamp_delta(tstamp); 3528 ci.ifa_prefered = preferred; 3529 ci.ifa_valid = valid; 3530 3531 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3532 } 3533 3534 static inline int rt_scope(int ifa_scope) 3535 { 3536 if (ifa_scope & IFA_HOST) 3537 return RT_SCOPE_HOST; 3538 else if (ifa_scope & IFA_LINK) 3539 return RT_SCOPE_LINK; 3540 else if (ifa_scope & IFA_SITE) 3541 return RT_SCOPE_SITE; 3542 else 3543 return RT_SCOPE_UNIVERSE; 3544 } 3545 3546 static inline int inet6_ifaddr_msgsize(void) 3547 { 3548 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3549 + nla_total_size(16) /* IFA_ADDRESS */ 3550 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3551 } 3552 3553 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3554 u32 pid, u32 seq, int event, unsigned int flags) 3555 { 3556 struct nlmsghdr *nlh; 3557 u32 preferred, valid; 3558 3559 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3560 if (nlh == NULL) 3561 return -EMSGSIZE; 3562 3563 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3564 ifa->idev->dev->ifindex); 3565 3566 if (!(ifa->flags&IFA_F_PERMANENT)) { 3567 preferred = ifa->prefered_lft; 3568 valid = ifa->valid_lft; 3569 if (preferred != INFINITY_LIFE_TIME) { 3570 long tval = (jiffies - ifa->tstamp)/HZ; 3571 if (preferred > tval) 3572 preferred -= tval; 3573 else 3574 preferred = 0; 3575 if (valid != INFINITY_LIFE_TIME) { 3576 if (valid > tval) 3577 valid -= tval; 3578 else 3579 valid = 0; 3580 } 3581 } 3582 } else { 3583 preferred = INFINITY_LIFE_TIME; 3584 valid = INFINITY_LIFE_TIME; 3585 } 3586 3587 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3588 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3589 nlmsg_cancel(skb, nlh); 3590 return -EMSGSIZE; 3591 } 3592 3593 return nlmsg_end(skb, nlh); 3594 } 3595 3596 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3597 u32 pid, u32 seq, int event, u16 flags) 3598 { 3599 struct nlmsghdr *nlh; 3600 u8 scope = RT_SCOPE_UNIVERSE; 3601 int ifindex = ifmca->idev->dev->ifindex; 3602 3603 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3604 scope = RT_SCOPE_SITE; 3605 3606 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3607 if (nlh == NULL) 3608 return -EMSGSIZE; 3609 3610 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3611 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3612 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3613 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3614 nlmsg_cancel(skb, nlh); 3615 return -EMSGSIZE; 3616 } 3617 3618 return nlmsg_end(skb, nlh); 3619 } 3620 3621 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3622 u32 pid, u32 seq, int event, unsigned int flags) 3623 { 3624 struct nlmsghdr *nlh; 3625 u8 scope = RT_SCOPE_UNIVERSE; 3626 int ifindex = ifaca->aca_idev->dev->ifindex; 3627 3628 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3629 scope = RT_SCOPE_SITE; 3630 3631 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3632 if (nlh == NULL) 3633 return -EMSGSIZE; 3634 3635 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3636 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3637 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3638 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3639 nlmsg_cancel(skb, nlh); 3640 return -EMSGSIZE; 3641 } 3642 3643 return nlmsg_end(skb, nlh); 3644 } 3645 3646 enum addr_type_t { 3647 UNICAST_ADDR, 3648 MULTICAST_ADDR, 3649 ANYCAST_ADDR, 3650 }; 3651 3652 /* called with rcu_read_lock() */ 3653 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3654 struct netlink_callback *cb, enum addr_type_t type, 3655 int s_ip_idx, int *p_ip_idx) 3656 { 3657 struct ifmcaddr6 *ifmca; 3658 struct ifacaddr6 *ifaca; 3659 int err = 1; 3660 int ip_idx = *p_ip_idx; 3661 3662 read_lock_bh(&idev->lock); 3663 switch (type) { 3664 case UNICAST_ADDR: { 3665 struct inet6_ifaddr *ifa; 3666 3667 /* unicast address incl. temp addr */ 3668 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3669 if (++ip_idx < s_ip_idx) 3670 continue; 3671 err = inet6_fill_ifaddr(skb, ifa, 3672 NETLINK_CB(cb->skb).pid, 3673 cb->nlh->nlmsg_seq, 3674 RTM_NEWADDR, 3675 NLM_F_MULTI); 3676 if (err <= 0) 3677 break; 3678 } 3679 break; 3680 } 3681 case MULTICAST_ADDR: 3682 /* multicast address */ 3683 for (ifmca = idev->mc_list; ifmca; 3684 ifmca = ifmca->next, ip_idx++) { 3685 if (ip_idx < s_ip_idx) 3686 continue; 3687 err = inet6_fill_ifmcaddr(skb, ifmca, 3688 NETLINK_CB(cb->skb).pid, 3689 cb->nlh->nlmsg_seq, 3690 RTM_GETMULTICAST, 3691 NLM_F_MULTI); 3692 if (err <= 0) 3693 break; 3694 } 3695 break; 3696 case ANYCAST_ADDR: 3697 /* anycast address */ 3698 for (ifaca = idev->ac_list; ifaca; 3699 ifaca = ifaca->aca_next, ip_idx++) { 3700 if (ip_idx < s_ip_idx) 3701 continue; 3702 err = inet6_fill_ifacaddr(skb, ifaca, 3703 NETLINK_CB(cb->skb).pid, 3704 cb->nlh->nlmsg_seq, 3705 RTM_GETANYCAST, 3706 NLM_F_MULTI); 3707 if (err <= 0) 3708 break; 3709 } 3710 break; 3711 default: 3712 break; 3713 } 3714 read_unlock_bh(&idev->lock); 3715 *p_ip_idx = ip_idx; 3716 return err; 3717 } 3718 3719 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3720 enum addr_type_t type) 3721 { 3722 struct net *net = sock_net(skb->sk); 3723 int h, s_h; 3724 int idx, ip_idx; 3725 int s_idx, s_ip_idx; 3726 struct net_device *dev; 3727 struct inet6_dev *idev; 3728 struct hlist_head *head; 3729 struct hlist_node *node; 3730 3731 s_h = cb->args[0]; 3732 s_idx = idx = cb->args[1]; 3733 s_ip_idx = ip_idx = cb->args[2]; 3734 3735 rcu_read_lock(); 3736 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3737 idx = 0; 3738 head = &net->dev_index_head[h]; 3739 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3740 if (idx < s_idx) 3741 goto cont; 3742 if (h > s_h || idx > s_idx) 3743 s_ip_idx = 0; 3744 ip_idx = 0; 3745 idev = __in6_dev_get(dev); 3746 if (!idev) 3747 goto cont; 3748 3749 if (in6_dump_addrs(idev, skb, cb, type, 3750 s_ip_idx, &ip_idx) <= 0) 3751 goto done; 3752 cont: 3753 idx++; 3754 } 3755 } 3756 done: 3757 rcu_read_unlock(); 3758 cb->args[0] = h; 3759 cb->args[1] = idx; 3760 cb->args[2] = ip_idx; 3761 3762 return skb->len; 3763 } 3764 3765 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3766 { 3767 enum addr_type_t type = UNICAST_ADDR; 3768 3769 return inet6_dump_addr(skb, cb, type); 3770 } 3771 3772 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3773 { 3774 enum addr_type_t type = MULTICAST_ADDR; 3775 3776 return inet6_dump_addr(skb, cb, type); 3777 } 3778 3779 3780 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3781 { 3782 enum addr_type_t type = ANYCAST_ADDR; 3783 3784 return inet6_dump_addr(skb, cb, type); 3785 } 3786 3787 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3788 void *arg) 3789 { 3790 struct net *net = sock_net(in_skb->sk); 3791 struct ifaddrmsg *ifm; 3792 struct nlattr *tb[IFA_MAX+1]; 3793 struct in6_addr *addr = NULL; 3794 struct net_device *dev = NULL; 3795 struct inet6_ifaddr *ifa; 3796 struct sk_buff *skb; 3797 int err; 3798 3799 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3800 if (err < 0) 3801 goto errout; 3802 3803 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3804 if (addr == NULL) { 3805 err = -EINVAL; 3806 goto errout; 3807 } 3808 3809 ifm = nlmsg_data(nlh); 3810 if (ifm->ifa_index) 3811 dev = __dev_get_by_index(net, ifm->ifa_index); 3812 3813 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3814 if (!ifa) { 3815 err = -EADDRNOTAVAIL; 3816 goto errout; 3817 } 3818 3819 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3820 if (!skb) { 3821 err = -ENOBUFS; 3822 goto errout_ifa; 3823 } 3824 3825 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3826 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3827 if (err < 0) { 3828 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3829 WARN_ON(err == -EMSGSIZE); 3830 kfree_skb(skb); 3831 goto errout_ifa; 3832 } 3833 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3834 errout_ifa: 3835 in6_ifa_put(ifa); 3836 errout: 3837 return err; 3838 } 3839 3840 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3841 { 3842 struct sk_buff *skb; 3843 struct net *net = dev_net(ifa->idev->dev); 3844 int err = -ENOBUFS; 3845 3846 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3847 if (skb == NULL) 3848 goto errout; 3849 3850 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3851 if (err < 0) { 3852 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3853 WARN_ON(err == -EMSGSIZE); 3854 kfree_skb(skb); 3855 goto errout; 3856 } 3857 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3858 return; 3859 errout: 3860 if (err < 0) 3861 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3862 } 3863 3864 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3865 __s32 *array, int bytes) 3866 { 3867 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3868 3869 memset(array, 0, bytes); 3870 array[DEVCONF_FORWARDING] = cnf->forwarding; 3871 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3872 array[DEVCONF_MTU6] = cnf->mtu6; 3873 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3874 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3875 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3876 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3877 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3878 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3879 jiffies_to_msecs(cnf->rtr_solicit_interval); 3880 array[DEVCONF_RTR_SOLICIT_DELAY] = 3881 jiffies_to_msecs(cnf->rtr_solicit_delay); 3882 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3883 #ifdef CONFIG_IPV6_PRIVACY 3884 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3885 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3886 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3887 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3888 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3889 #endif 3890 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3891 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3892 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3893 #ifdef CONFIG_IPV6_ROUTER_PREF 3894 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3895 array[DEVCONF_RTR_PROBE_INTERVAL] = 3896 jiffies_to_msecs(cnf->rtr_probe_interval); 3897 #ifdef CONFIG_IPV6_ROUTE_INFO 3898 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3899 #endif 3900 #endif 3901 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3902 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3903 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3904 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3905 #endif 3906 #ifdef CONFIG_IPV6_MROUTE 3907 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3908 #endif 3909 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3910 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3911 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3912 } 3913 3914 static inline size_t inet6_ifla6_size(void) 3915 { 3916 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3917 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3918 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3919 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3920 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3921 } 3922 3923 static inline size_t inet6_if_nlmsg_size(void) 3924 { 3925 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3926 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3927 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3928 + nla_total_size(4) /* IFLA_MTU */ 3929 + nla_total_size(4) /* IFLA_LINK */ 3930 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3931 } 3932 3933 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3934 int items, int bytes) 3935 { 3936 int i; 3937 int pad = bytes - sizeof(u64) * items; 3938 BUG_ON(pad < 0); 3939 3940 /* Use put_unaligned() because stats may not be aligned for u64. */ 3941 put_unaligned(items, &stats[0]); 3942 for (i = 1; i < items; i++) 3943 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3944 3945 memset(&stats[items], 0, pad); 3946 } 3947 3948 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3949 int items, int bytes, size_t syncpoff) 3950 { 3951 int i; 3952 int pad = bytes - sizeof(u64) * items; 3953 BUG_ON(pad < 0); 3954 3955 /* Use put_unaligned() because stats may not be aligned for u64. */ 3956 put_unaligned(items, &stats[0]); 3957 for (i = 1; i < items; i++) 3958 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3959 3960 memset(&stats[items], 0, pad); 3961 } 3962 3963 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3964 int bytes) 3965 { 3966 switch (attrtype) { 3967 case IFLA_INET6_STATS: 3968 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3969 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3970 break; 3971 case IFLA_INET6_ICMP6STATS: 3972 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3973 break; 3974 } 3975 } 3976 3977 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3978 { 3979 struct nlattr *nla; 3980 struct ifla_cacheinfo ci; 3981 3982 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3983 3984 ci.max_reasm_len = IPV6_MAXPLEN; 3985 ci.tstamp = cstamp_delta(idev->tstamp); 3986 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3987 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3988 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3989 3990 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3991 if (nla == NULL) 3992 goto nla_put_failure; 3993 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3994 3995 /* XXX - MC not implemented */ 3996 3997 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3998 if (nla == NULL) 3999 goto nla_put_failure; 4000 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4001 4002 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4003 if (nla == NULL) 4004 goto nla_put_failure; 4005 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4006 4007 return 0; 4008 4009 nla_put_failure: 4010 return -EMSGSIZE; 4011 } 4012 4013 static size_t inet6_get_link_af_size(const struct net_device *dev) 4014 { 4015 if (!__in6_dev_get(dev)) 4016 return 0; 4017 4018 return inet6_ifla6_size(); 4019 } 4020 4021 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4022 { 4023 struct inet6_dev *idev = __in6_dev_get(dev); 4024 4025 if (!idev) 4026 return -ENODATA; 4027 4028 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4029 return -EMSGSIZE; 4030 4031 return 0; 4032 } 4033 4034 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4035 u32 pid, u32 seq, int event, unsigned int flags) 4036 { 4037 struct net_device *dev = idev->dev; 4038 struct ifinfomsg *hdr; 4039 struct nlmsghdr *nlh; 4040 void *protoinfo; 4041 4042 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 4043 if (nlh == NULL) 4044 return -EMSGSIZE; 4045 4046 hdr = nlmsg_data(nlh); 4047 hdr->ifi_family = AF_INET6; 4048 hdr->__ifi_pad = 0; 4049 hdr->ifi_type = dev->type; 4050 hdr->ifi_index = dev->ifindex; 4051 hdr->ifi_flags = dev_get_flags(dev); 4052 hdr->ifi_change = 0; 4053 4054 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 4055 4056 if (dev->addr_len) 4057 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 4058 4059 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 4060 if (dev->ifindex != dev->iflink) 4061 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 4062 4063 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4064 if (protoinfo == NULL) 4065 goto nla_put_failure; 4066 4067 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4068 goto nla_put_failure; 4069 4070 nla_nest_end(skb, protoinfo); 4071 return nlmsg_end(skb, nlh); 4072 4073 nla_put_failure: 4074 nlmsg_cancel(skb, nlh); 4075 return -EMSGSIZE; 4076 } 4077 4078 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4079 { 4080 struct net *net = sock_net(skb->sk); 4081 int h, s_h; 4082 int idx = 0, s_idx; 4083 struct net_device *dev; 4084 struct inet6_dev *idev; 4085 struct hlist_head *head; 4086 struct hlist_node *node; 4087 4088 s_h = cb->args[0]; 4089 s_idx = cb->args[1]; 4090 4091 rcu_read_lock(); 4092 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4093 idx = 0; 4094 head = &net->dev_index_head[h]; 4095 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4096 if (idx < s_idx) 4097 goto cont; 4098 idev = __in6_dev_get(dev); 4099 if (!idev) 4100 goto cont; 4101 if (inet6_fill_ifinfo(skb, idev, 4102 NETLINK_CB(cb->skb).pid, 4103 cb->nlh->nlmsg_seq, 4104 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4105 goto out; 4106 cont: 4107 idx++; 4108 } 4109 } 4110 out: 4111 rcu_read_unlock(); 4112 cb->args[1] = idx; 4113 cb->args[0] = h; 4114 4115 return skb->len; 4116 } 4117 4118 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4119 { 4120 struct sk_buff *skb; 4121 struct net *net = dev_net(idev->dev); 4122 int err = -ENOBUFS; 4123 4124 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4125 if (skb == NULL) 4126 goto errout; 4127 4128 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4129 if (err < 0) { 4130 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4131 WARN_ON(err == -EMSGSIZE); 4132 kfree_skb(skb); 4133 goto errout; 4134 } 4135 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4136 return; 4137 errout: 4138 if (err < 0) 4139 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4140 } 4141 4142 static inline size_t inet6_prefix_nlmsg_size(void) 4143 { 4144 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4145 + nla_total_size(sizeof(struct in6_addr)) 4146 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4147 } 4148 4149 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4150 struct prefix_info *pinfo, u32 pid, u32 seq, 4151 int event, unsigned int flags) 4152 { 4153 struct prefixmsg *pmsg; 4154 struct nlmsghdr *nlh; 4155 struct prefix_cacheinfo ci; 4156 4157 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4158 if (nlh == NULL) 4159 return -EMSGSIZE; 4160 4161 pmsg = nlmsg_data(nlh); 4162 pmsg->prefix_family = AF_INET6; 4163 pmsg->prefix_pad1 = 0; 4164 pmsg->prefix_pad2 = 0; 4165 pmsg->prefix_ifindex = idev->dev->ifindex; 4166 pmsg->prefix_len = pinfo->prefix_len; 4167 pmsg->prefix_type = pinfo->type; 4168 pmsg->prefix_pad3 = 0; 4169 pmsg->prefix_flags = 0; 4170 if (pinfo->onlink) 4171 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4172 if (pinfo->autoconf) 4173 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4174 4175 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4176 4177 ci.preferred_time = ntohl(pinfo->prefered); 4178 ci.valid_time = ntohl(pinfo->valid); 4179 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4180 4181 return nlmsg_end(skb, nlh); 4182 4183 nla_put_failure: 4184 nlmsg_cancel(skb, nlh); 4185 return -EMSGSIZE; 4186 } 4187 4188 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4189 struct prefix_info *pinfo) 4190 { 4191 struct sk_buff *skb; 4192 struct net *net = dev_net(idev->dev); 4193 int err = -ENOBUFS; 4194 4195 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4196 if (skb == NULL) 4197 goto errout; 4198 4199 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4200 if (err < 0) { 4201 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4202 WARN_ON(err == -EMSGSIZE); 4203 kfree_skb(skb); 4204 goto errout; 4205 } 4206 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4207 return; 4208 errout: 4209 if (err < 0) 4210 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4211 } 4212 4213 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4214 { 4215 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4216 4217 switch (event) { 4218 case RTM_NEWADDR: 4219 /* 4220 * If the address was optimistic 4221 * we inserted the route at the start of 4222 * our DAD process, so we don't need 4223 * to do it again 4224 */ 4225 if (!(ifp->rt->rt6i_node)) 4226 ip6_ins_rt(ifp->rt); 4227 if (ifp->idev->cnf.forwarding) 4228 addrconf_join_anycast(ifp); 4229 break; 4230 case RTM_DELADDR: 4231 if (ifp->idev->cnf.forwarding) 4232 addrconf_leave_anycast(ifp); 4233 addrconf_leave_solict(ifp->idev, &ifp->addr); 4234 dst_hold(&ifp->rt->dst); 4235 4236 if (ip6_del_rt(ifp->rt)) 4237 dst_free(&ifp->rt->dst); 4238 break; 4239 } 4240 } 4241 4242 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4243 { 4244 rcu_read_lock_bh(); 4245 if (likely(ifp->idev->dead == 0)) 4246 __ipv6_ifa_notify(event, ifp); 4247 rcu_read_unlock_bh(); 4248 } 4249 4250 #ifdef CONFIG_SYSCTL 4251 4252 static 4253 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4254 void __user *buffer, size_t *lenp, loff_t *ppos) 4255 { 4256 int *valp = ctl->data; 4257 int val = *valp; 4258 loff_t pos = *ppos; 4259 int ret; 4260 4261 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4262 4263 if (write) 4264 ret = addrconf_fixup_forwarding(ctl, valp, val); 4265 if (ret) 4266 *ppos = pos; 4267 return ret; 4268 } 4269 4270 static void dev_disable_change(struct inet6_dev *idev) 4271 { 4272 if (!idev || !idev->dev) 4273 return; 4274 4275 if (idev->cnf.disable_ipv6) 4276 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4277 else 4278 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4279 } 4280 4281 static void addrconf_disable_change(struct net *net, __s32 newf) 4282 { 4283 struct net_device *dev; 4284 struct inet6_dev *idev; 4285 4286 rcu_read_lock(); 4287 for_each_netdev_rcu(net, dev) { 4288 idev = __in6_dev_get(dev); 4289 if (idev) { 4290 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4291 idev->cnf.disable_ipv6 = newf; 4292 if (changed) 4293 dev_disable_change(idev); 4294 } 4295 } 4296 rcu_read_unlock(); 4297 } 4298 4299 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4300 { 4301 struct net *net; 4302 4303 net = (struct net *)table->extra2; 4304 4305 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4306 return 0; 4307 4308 if (!rtnl_trylock()) { 4309 /* Restore the original values before restarting */ 4310 *p = old; 4311 return restart_syscall(); 4312 } 4313 4314 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4315 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4316 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4317 addrconf_disable_change(net, newf); 4318 } else if ((!*p) ^ (!old)) 4319 dev_disable_change((struct inet6_dev *)table->extra1); 4320 4321 rtnl_unlock(); 4322 return 0; 4323 } 4324 4325 static 4326 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4327 void __user *buffer, size_t *lenp, loff_t *ppos) 4328 { 4329 int *valp = ctl->data; 4330 int val = *valp; 4331 loff_t pos = *ppos; 4332 int ret; 4333 4334 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4335 4336 if (write) 4337 ret = addrconf_disable_ipv6(ctl, valp, val); 4338 if (ret) 4339 *ppos = pos; 4340 return ret; 4341 } 4342 4343 static struct addrconf_sysctl_table 4344 { 4345 struct ctl_table_header *sysctl_header; 4346 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4347 char *dev_name; 4348 } addrconf_sysctl __read_mostly = { 4349 .sysctl_header = NULL, 4350 .addrconf_vars = { 4351 { 4352 .procname = "forwarding", 4353 .data = &ipv6_devconf.forwarding, 4354 .maxlen = sizeof(int), 4355 .mode = 0644, 4356 .proc_handler = addrconf_sysctl_forward, 4357 }, 4358 { 4359 .procname = "hop_limit", 4360 .data = &ipv6_devconf.hop_limit, 4361 .maxlen = sizeof(int), 4362 .mode = 0644, 4363 .proc_handler = proc_dointvec, 4364 }, 4365 { 4366 .procname = "mtu", 4367 .data = &ipv6_devconf.mtu6, 4368 .maxlen = sizeof(int), 4369 .mode = 0644, 4370 .proc_handler = proc_dointvec, 4371 }, 4372 { 4373 .procname = "accept_ra", 4374 .data = &ipv6_devconf.accept_ra, 4375 .maxlen = sizeof(int), 4376 .mode = 0644, 4377 .proc_handler = proc_dointvec, 4378 }, 4379 { 4380 .procname = "accept_redirects", 4381 .data = &ipv6_devconf.accept_redirects, 4382 .maxlen = sizeof(int), 4383 .mode = 0644, 4384 .proc_handler = proc_dointvec, 4385 }, 4386 { 4387 .procname = "autoconf", 4388 .data = &ipv6_devconf.autoconf, 4389 .maxlen = sizeof(int), 4390 .mode = 0644, 4391 .proc_handler = proc_dointvec, 4392 }, 4393 { 4394 .procname = "dad_transmits", 4395 .data = &ipv6_devconf.dad_transmits, 4396 .maxlen = sizeof(int), 4397 .mode = 0644, 4398 .proc_handler = proc_dointvec, 4399 }, 4400 { 4401 .procname = "router_solicitations", 4402 .data = &ipv6_devconf.rtr_solicits, 4403 .maxlen = sizeof(int), 4404 .mode = 0644, 4405 .proc_handler = proc_dointvec, 4406 }, 4407 { 4408 .procname = "router_solicitation_interval", 4409 .data = &ipv6_devconf.rtr_solicit_interval, 4410 .maxlen = sizeof(int), 4411 .mode = 0644, 4412 .proc_handler = proc_dointvec_jiffies, 4413 }, 4414 { 4415 .procname = "router_solicitation_delay", 4416 .data = &ipv6_devconf.rtr_solicit_delay, 4417 .maxlen = sizeof(int), 4418 .mode = 0644, 4419 .proc_handler = proc_dointvec_jiffies, 4420 }, 4421 { 4422 .procname = "force_mld_version", 4423 .data = &ipv6_devconf.force_mld_version, 4424 .maxlen = sizeof(int), 4425 .mode = 0644, 4426 .proc_handler = proc_dointvec, 4427 }, 4428 #ifdef CONFIG_IPV6_PRIVACY 4429 { 4430 .procname = "use_tempaddr", 4431 .data = &ipv6_devconf.use_tempaddr, 4432 .maxlen = sizeof(int), 4433 .mode = 0644, 4434 .proc_handler = proc_dointvec, 4435 }, 4436 { 4437 .procname = "temp_valid_lft", 4438 .data = &ipv6_devconf.temp_valid_lft, 4439 .maxlen = sizeof(int), 4440 .mode = 0644, 4441 .proc_handler = proc_dointvec, 4442 }, 4443 { 4444 .procname = "temp_prefered_lft", 4445 .data = &ipv6_devconf.temp_prefered_lft, 4446 .maxlen = sizeof(int), 4447 .mode = 0644, 4448 .proc_handler = proc_dointvec, 4449 }, 4450 { 4451 .procname = "regen_max_retry", 4452 .data = &ipv6_devconf.regen_max_retry, 4453 .maxlen = sizeof(int), 4454 .mode = 0644, 4455 .proc_handler = proc_dointvec, 4456 }, 4457 { 4458 .procname = "max_desync_factor", 4459 .data = &ipv6_devconf.max_desync_factor, 4460 .maxlen = sizeof(int), 4461 .mode = 0644, 4462 .proc_handler = proc_dointvec, 4463 }, 4464 #endif 4465 { 4466 .procname = "max_addresses", 4467 .data = &ipv6_devconf.max_addresses, 4468 .maxlen = sizeof(int), 4469 .mode = 0644, 4470 .proc_handler = proc_dointvec, 4471 }, 4472 { 4473 .procname = "accept_ra_defrtr", 4474 .data = &ipv6_devconf.accept_ra_defrtr, 4475 .maxlen = sizeof(int), 4476 .mode = 0644, 4477 .proc_handler = proc_dointvec, 4478 }, 4479 { 4480 .procname = "accept_ra_pinfo", 4481 .data = &ipv6_devconf.accept_ra_pinfo, 4482 .maxlen = sizeof(int), 4483 .mode = 0644, 4484 .proc_handler = proc_dointvec, 4485 }, 4486 #ifdef CONFIG_IPV6_ROUTER_PREF 4487 { 4488 .procname = "accept_ra_rtr_pref", 4489 .data = &ipv6_devconf.accept_ra_rtr_pref, 4490 .maxlen = sizeof(int), 4491 .mode = 0644, 4492 .proc_handler = proc_dointvec, 4493 }, 4494 { 4495 .procname = "router_probe_interval", 4496 .data = &ipv6_devconf.rtr_probe_interval, 4497 .maxlen = sizeof(int), 4498 .mode = 0644, 4499 .proc_handler = proc_dointvec_jiffies, 4500 }, 4501 #ifdef CONFIG_IPV6_ROUTE_INFO 4502 { 4503 .procname = "accept_ra_rt_info_max_plen", 4504 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4505 .maxlen = sizeof(int), 4506 .mode = 0644, 4507 .proc_handler = proc_dointvec, 4508 }, 4509 #endif 4510 #endif 4511 { 4512 .procname = "proxy_ndp", 4513 .data = &ipv6_devconf.proxy_ndp, 4514 .maxlen = sizeof(int), 4515 .mode = 0644, 4516 .proc_handler = proc_dointvec, 4517 }, 4518 { 4519 .procname = "accept_source_route", 4520 .data = &ipv6_devconf.accept_source_route, 4521 .maxlen = sizeof(int), 4522 .mode = 0644, 4523 .proc_handler = proc_dointvec, 4524 }, 4525 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4526 { 4527 .procname = "optimistic_dad", 4528 .data = &ipv6_devconf.optimistic_dad, 4529 .maxlen = sizeof(int), 4530 .mode = 0644, 4531 .proc_handler = proc_dointvec, 4532 4533 }, 4534 #endif 4535 #ifdef CONFIG_IPV6_MROUTE 4536 { 4537 .procname = "mc_forwarding", 4538 .data = &ipv6_devconf.mc_forwarding, 4539 .maxlen = sizeof(int), 4540 .mode = 0444, 4541 .proc_handler = proc_dointvec, 4542 }, 4543 #endif 4544 { 4545 .procname = "disable_ipv6", 4546 .data = &ipv6_devconf.disable_ipv6, 4547 .maxlen = sizeof(int), 4548 .mode = 0644, 4549 .proc_handler = addrconf_sysctl_disable, 4550 }, 4551 { 4552 .procname = "accept_dad", 4553 .data = &ipv6_devconf.accept_dad, 4554 .maxlen = sizeof(int), 4555 .mode = 0644, 4556 .proc_handler = proc_dointvec, 4557 }, 4558 { 4559 .procname = "force_tllao", 4560 .data = &ipv6_devconf.force_tllao, 4561 .maxlen = sizeof(int), 4562 .mode = 0644, 4563 .proc_handler = proc_dointvec 4564 }, 4565 { 4566 /* sentinel */ 4567 } 4568 }, 4569 }; 4570 4571 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4572 struct inet6_dev *idev, struct ipv6_devconf *p) 4573 { 4574 int i; 4575 struct addrconf_sysctl_table *t; 4576 4577 #define ADDRCONF_CTL_PATH_DEV 3 4578 4579 struct ctl_path addrconf_ctl_path[] = { 4580 { .procname = "net", }, 4581 { .procname = "ipv6", }, 4582 { .procname = "conf", }, 4583 { /* to be set */ }, 4584 { }, 4585 }; 4586 4587 4588 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4589 if (t == NULL) 4590 goto out; 4591 4592 for (i = 0; t->addrconf_vars[i].data; i++) { 4593 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4594 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4595 t->addrconf_vars[i].extra2 = net; 4596 } 4597 4598 /* 4599 * Make a copy of dev_name, because '.procname' is regarded as const 4600 * by sysctl and we wouldn't want anyone to change it under our feet 4601 * (see SIOCSIFNAME). 4602 */ 4603 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4604 if (!t->dev_name) 4605 goto free; 4606 4607 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4608 4609 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4610 t->addrconf_vars); 4611 if (t->sysctl_header == NULL) 4612 goto free_procname; 4613 4614 p->sysctl = t; 4615 return 0; 4616 4617 free_procname: 4618 kfree(t->dev_name); 4619 free: 4620 kfree(t); 4621 out: 4622 return -ENOBUFS; 4623 } 4624 4625 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4626 { 4627 struct addrconf_sysctl_table *t; 4628 4629 if (p->sysctl == NULL) 4630 return; 4631 4632 t = p->sysctl; 4633 p->sysctl = NULL; 4634 unregister_net_sysctl_table(t->sysctl_header); 4635 kfree(t->dev_name); 4636 kfree(t); 4637 } 4638 4639 static void addrconf_sysctl_register(struct inet6_dev *idev) 4640 { 4641 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4642 &ndisc_ifinfo_sysctl_change); 4643 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4644 idev, &idev->cnf); 4645 } 4646 4647 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4648 { 4649 __addrconf_sysctl_unregister(&idev->cnf); 4650 neigh_sysctl_unregister(idev->nd_parms); 4651 } 4652 4653 4654 #endif 4655 4656 static int __net_init addrconf_init_net(struct net *net) 4657 { 4658 int err; 4659 struct ipv6_devconf *all, *dflt; 4660 4661 err = -ENOMEM; 4662 all = &ipv6_devconf; 4663 dflt = &ipv6_devconf_dflt; 4664 4665 if (!net_eq(net, &init_net)) { 4666 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4667 if (all == NULL) 4668 goto err_alloc_all; 4669 4670 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4671 if (dflt == NULL) 4672 goto err_alloc_dflt; 4673 } else { 4674 /* these will be inherited by all namespaces */ 4675 dflt->autoconf = ipv6_defaults.autoconf; 4676 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4677 } 4678 4679 net->ipv6.devconf_all = all; 4680 net->ipv6.devconf_dflt = dflt; 4681 4682 #ifdef CONFIG_SYSCTL 4683 err = __addrconf_sysctl_register(net, "all", NULL, all); 4684 if (err < 0) 4685 goto err_reg_all; 4686 4687 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4688 if (err < 0) 4689 goto err_reg_dflt; 4690 #endif 4691 return 0; 4692 4693 #ifdef CONFIG_SYSCTL 4694 err_reg_dflt: 4695 __addrconf_sysctl_unregister(all); 4696 err_reg_all: 4697 kfree(dflt); 4698 #endif 4699 err_alloc_dflt: 4700 kfree(all); 4701 err_alloc_all: 4702 return err; 4703 } 4704 4705 static void __net_exit addrconf_exit_net(struct net *net) 4706 { 4707 #ifdef CONFIG_SYSCTL 4708 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4709 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4710 #endif 4711 if (!net_eq(net, &init_net)) { 4712 kfree(net->ipv6.devconf_dflt); 4713 kfree(net->ipv6.devconf_all); 4714 } 4715 } 4716 4717 static struct pernet_operations addrconf_ops = { 4718 .init = addrconf_init_net, 4719 .exit = addrconf_exit_net, 4720 }; 4721 4722 /* 4723 * Device notifier 4724 */ 4725 4726 int register_inet6addr_notifier(struct notifier_block *nb) 4727 { 4728 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4729 } 4730 EXPORT_SYMBOL(register_inet6addr_notifier); 4731 4732 int unregister_inet6addr_notifier(struct notifier_block *nb) 4733 { 4734 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4735 } 4736 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4737 4738 static struct rtnl_af_ops inet6_ops = { 4739 .family = AF_INET6, 4740 .fill_link_af = inet6_fill_link_af, 4741 .get_link_af_size = inet6_get_link_af_size, 4742 }; 4743 4744 /* 4745 * Init / cleanup code 4746 */ 4747 4748 int __init addrconf_init(void) 4749 { 4750 int i, err; 4751 4752 err = ipv6_addr_label_init(); 4753 if (err < 0) { 4754 printk(KERN_CRIT "IPv6 Addrconf:" 4755 " cannot initialize default policy table: %d.\n", err); 4756 goto out; 4757 } 4758 4759 err = register_pernet_subsys(&addrconf_ops); 4760 if (err < 0) 4761 goto out_addrlabel; 4762 4763 /* The addrconf netdev notifier requires that loopback_dev 4764 * has it's ipv6 private information allocated and setup 4765 * before it can bring up and give link-local addresses 4766 * to other devices which are up. 4767 * 4768 * Unfortunately, loopback_dev is not necessarily the first 4769 * entry in the global dev_base list of net devices. In fact, 4770 * it is likely to be the very last entry on that list. 4771 * So this causes the notifier registry below to try and 4772 * give link-local addresses to all devices besides loopback_dev 4773 * first, then loopback_dev, which cases all the non-loopback_dev 4774 * devices to fail to get a link-local address. 4775 * 4776 * So, as a temporary fix, allocate the ipv6 structure for 4777 * loopback_dev first by hand. 4778 * Longer term, all of the dependencies ipv6 has upon the loopback 4779 * device and it being up should be removed. 4780 */ 4781 rtnl_lock(); 4782 if (!ipv6_add_dev(init_net.loopback_dev)) 4783 err = -ENOMEM; 4784 rtnl_unlock(); 4785 if (err) 4786 goto errlo; 4787 4788 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4789 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4790 4791 register_netdevice_notifier(&ipv6_dev_notf); 4792 4793 addrconf_verify(0); 4794 4795 err = rtnl_af_register(&inet6_ops); 4796 if (err < 0) 4797 goto errout_af; 4798 4799 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4800 NULL); 4801 if (err < 0) 4802 goto errout; 4803 4804 /* Only the first call to __rtnl_register can fail */ 4805 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4806 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4807 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4808 inet6_dump_ifaddr, NULL); 4809 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4810 inet6_dump_ifmcaddr, NULL); 4811 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4812 inet6_dump_ifacaddr, NULL); 4813 4814 ipv6_addr_label_rtnl_register(); 4815 4816 return 0; 4817 errout: 4818 rtnl_af_unregister(&inet6_ops); 4819 errout_af: 4820 unregister_netdevice_notifier(&ipv6_dev_notf); 4821 errlo: 4822 unregister_pernet_subsys(&addrconf_ops); 4823 out_addrlabel: 4824 ipv6_addr_label_cleanup(); 4825 out: 4826 return err; 4827 } 4828 4829 void addrconf_cleanup(void) 4830 { 4831 struct net_device *dev; 4832 int i; 4833 4834 unregister_netdevice_notifier(&ipv6_dev_notf); 4835 unregister_pernet_subsys(&addrconf_ops); 4836 ipv6_addr_label_cleanup(); 4837 4838 rtnl_lock(); 4839 4840 __rtnl_af_unregister(&inet6_ops); 4841 4842 /* clean dev list */ 4843 for_each_netdev(&init_net, dev) { 4844 if (__in6_dev_get(dev) == NULL) 4845 continue; 4846 addrconf_ifdown(dev, 1); 4847 } 4848 addrconf_ifdown(init_net.loopback_dev, 2); 4849 4850 /* 4851 * Check hash table. 4852 */ 4853 spin_lock_bh(&addrconf_hash_lock); 4854 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4855 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4856 spin_unlock_bh(&addrconf_hash_lock); 4857 4858 del_timer(&addr_chk_timer); 4859 rtnl_unlock(); 4860 } 4861