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, 0); 634 if (IS_ERR(rt)) { 635 err = PTR_ERR(rt); 636 goto out; 637 } 638 639 ipv6_addr_copy(&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_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 ipv6_addr_copy(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 ipv6_addr_copy(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 ipv6_addr_copy(&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 if (!(dev->flags & IFF_LOOPBACK)) 1809 addrconf_add_mroute(dev); 1810 1811 /* Add link local route */ 1812 addrconf_add_lroute(dev); 1813 return idev; 1814 } 1815 1816 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1817 { 1818 struct prefix_info *pinfo; 1819 __u32 valid_lft; 1820 __u32 prefered_lft; 1821 int addr_type; 1822 struct inet6_dev *in6_dev; 1823 struct net *net = dev_net(dev); 1824 1825 pinfo = (struct prefix_info *) opt; 1826 1827 if (len < sizeof(struct prefix_info)) { 1828 ADBG(("addrconf: prefix option too short\n")); 1829 return; 1830 } 1831 1832 /* 1833 * Validation checks ([ADDRCONF], page 19) 1834 */ 1835 1836 addr_type = ipv6_addr_type(&pinfo->prefix); 1837 1838 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1839 return; 1840 1841 valid_lft = ntohl(pinfo->valid); 1842 prefered_lft = ntohl(pinfo->prefered); 1843 1844 if (prefered_lft > valid_lft) { 1845 if (net_ratelimit()) 1846 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1847 return; 1848 } 1849 1850 in6_dev = in6_dev_get(dev); 1851 1852 if (in6_dev == NULL) { 1853 if (net_ratelimit()) 1854 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1855 return; 1856 } 1857 1858 /* 1859 * Two things going on here: 1860 * 1) Add routes for on-link prefixes 1861 * 2) Configure prefixes with the auto flag set 1862 */ 1863 1864 if (pinfo->onlink) { 1865 struct rt6_info *rt; 1866 unsigned long rt_expires; 1867 1868 /* Avoid arithmetic overflow. Really, we could 1869 * save rt_expires in seconds, likely valid_lft, 1870 * but it would require division in fib gc, that it 1871 * not good. 1872 */ 1873 if (HZ > USER_HZ) 1874 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1875 else 1876 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1877 1878 if (addrconf_finite_timeout(rt_expires)) 1879 rt_expires *= HZ; 1880 1881 rt = addrconf_get_prefix_route(&pinfo->prefix, 1882 pinfo->prefix_len, 1883 dev, 1884 RTF_ADDRCONF | RTF_PREFIX_RT, 1885 RTF_GATEWAY | RTF_DEFAULT); 1886 1887 if (rt) { 1888 /* Autoconf prefix route */ 1889 if (valid_lft == 0) { 1890 ip6_del_rt(rt); 1891 rt = NULL; 1892 } else if (addrconf_finite_timeout(rt_expires)) { 1893 /* not infinity */ 1894 rt->rt6i_expires = jiffies + rt_expires; 1895 rt->rt6i_flags |= RTF_EXPIRES; 1896 } else { 1897 rt->rt6i_flags &= ~RTF_EXPIRES; 1898 rt->rt6i_expires = 0; 1899 } 1900 } else if (valid_lft) { 1901 clock_t expires = 0; 1902 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1903 if (addrconf_finite_timeout(rt_expires)) { 1904 /* not infinity */ 1905 flags |= RTF_EXPIRES; 1906 expires = jiffies_to_clock_t(rt_expires); 1907 } 1908 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1909 dev, expires, flags); 1910 } 1911 if (rt) 1912 dst_release(&rt->dst); 1913 } 1914 1915 /* Try to figure out our local address for this prefix */ 1916 1917 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1918 struct inet6_ifaddr * ifp; 1919 struct in6_addr addr; 1920 int create = 0, update_lft = 0; 1921 1922 if (pinfo->prefix_len == 64) { 1923 memcpy(&addr, &pinfo->prefix, 8); 1924 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1925 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1926 in6_dev_put(in6_dev); 1927 return; 1928 } 1929 goto ok; 1930 } 1931 if (net_ratelimit()) 1932 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1933 pinfo->prefix_len); 1934 in6_dev_put(in6_dev); 1935 return; 1936 1937 ok: 1938 1939 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1940 1941 if (ifp == NULL && valid_lft) { 1942 int max_addresses = in6_dev->cnf.max_addresses; 1943 u32 addr_flags = 0; 1944 1945 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1946 if (in6_dev->cnf.optimistic_dad && 1947 !net->ipv6.devconf_all->forwarding) 1948 addr_flags = IFA_F_OPTIMISTIC; 1949 #endif 1950 1951 /* Do not allow to create too much of autoconfigured 1952 * addresses; this would be too easy way to crash kernel. 1953 */ 1954 if (!max_addresses || 1955 ipv6_count_addresses(in6_dev) < max_addresses) 1956 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1957 addr_type&IPV6_ADDR_SCOPE_MASK, 1958 addr_flags); 1959 1960 if (!ifp || IS_ERR(ifp)) { 1961 in6_dev_put(in6_dev); 1962 return; 1963 } 1964 1965 update_lft = create = 1; 1966 ifp->cstamp = jiffies; 1967 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1968 } 1969 1970 if (ifp) { 1971 int flags; 1972 unsigned long now; 1973 #ifdef CONFIG_IPV6_PRIVACY 1974 struct inet6_ifaddr *ift; 1975 #endif 1976 u32 stored_lft; 1977 1978 /* update lifetime (RFC2462 5.5.3 e) */ 1979 spin_lock(&ifp->lock); 1980 now = jiffies; 1981 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1982 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1983 else 1984 stored_lft = 0; 1985 if (!update_lft && stored_lft) { 1986 if (valid_lft > MIN_VALID_LIFETIME || 1987 valid_lft > stored_lft) 1988 update_lft = 1; 1989 else if (stored_lft <= MIN_VALID_LIFETIME) { 1990 /* valid_lft <= stored_lft is always true */ 1991 /* 1992 * RFC 4862 Section 5.5.3e: 1993 * "Note that the preferred lifetime of 1994 * the corresponding address is always 1995 * reset to the Preferred Lifetime in 1996 * the received Prefix Information 1997 * option, regardless of whether the 1998 * valid lifetime is also reset or 1999 * ignored." 2000 * 2001 * So if the preferred lifetime in 2002 * this advertisement is different 2003 * than what we have stored, but the 2004 * valid lifetime is invalid, just 2005 * reset prefered_lft. 2006 * 2007 * We must set the valid lifetime 2008 * to the stored lifetime since we'll 2009 * be updating the timestamp below, 2010 * else we'll set it back to the 2011 * minimum. 2012 */ 2013 if (prefered_lft != ifp->prefered_lft) { 2014 valid_lft = stored_lft; 2015 update_lft = 1; 2016 } 2017 } else { 2018 valid_lft = MIN_VALID_LIFETIME; 2019 if (valid_lft < prefered_lft) 2020 prefered_lft = valid_lft; 2021 update_lft = 1; 2022 } 2023 } 2024 2025 if (update_lft) { 2026 ifp->valid_lft = valid_lft; 2027 ifp->prefered_lft = prefered_lft; 2028 ifp->tstamp = now; 2029 flags = ifp->flags; 2030 ifp->flags &= ~IFA_F_DEPRECATED; 2031 spin_unlock(&ifp->lock); 2032 2033 if (!(flags&IFA_F_TENTATIVE)) 2034 ipv6_ifa_notify(0, ifp); 2035 } else 2036 spin_unlock(&ifp->lock); 2037 2038 #ifdef CONFIG_IPV6_PRIVACY 2039 read_lock_bh(&in6_dev->lock); 2040 /* update all temporary addresses in the list */ 2041 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2042 tmp_list) { 2043 int age, max_valid, max_prefered; 2044 2045 if (ifp != ift->ifpub) 2046 continue; 2047 2048 /* 2049 * RFC 4941 section 3.3: 2050 * If a received option will extend the lifetime 2051 * of a public address, the lifetimes of 2052 * temporary addresses should be extended, 2053 * subject to the overall constraint that no 2054 * temporary addresses should ever remain 2055 * "valid" or "preferred" for a time longer than 2056 * (TEMP_VALID_LIFETIME) or 2057 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2058 * respectively. 2059 */ 2060 age = (now - ift->cstamp) / HZ; 2061 max_valid = in6_dev->cnf.temp_valid_lft - age; 2062 if (max_valid < 0) 2063 max_valid = 0; 2064 2065 max_prefered = in6_dev->cnf.temp_prefered_lft - 2066 in6_dev->cnf.max_desync_factor - 2067 age; 2068 if (max_prefered < 0) 2069 max_prefered = 0; 2070 2071 if (valid_lft > max_valid) 2072 valid_lft = max_valid; 2073 2074 if (prefered_lft > max_prefered) 2075 prefered_lft = max_prefered; 2076 2077 spin_lock(&ift->lock); 2078 flags = ift->flags; 2079 ift->valid_lft = valid_lft; 2080 ift->prefered_lft = prefered_lft; 2081 ift->tstamp = now; 2082 if (prefered_lft > 0) 2083 ift->flags &= ~IFA_F_DEPRECATED; 2084 2085 spin_unlock(&ift->lock); 2086 if (!(flags&IFA_F_TENTATIVE)) 2087 ipv6_ifa_notify(0, ift); 2088 } 2089 2090 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2091 /* 2092 * When a new public address is created as 2093 * described in [ADDRCONF], also create a new 2094 * temporary address. Also create a temporary 2095 * address if it's enabled but no temporary 2096 * address currently exists. 2097 */ 2098 read_unlock_bh(&in6_dev->lock); 2099 ipv6_create_tempaddr(ifp, NULL); 2100 } else { 2101 read_unlock_bh(&in6_dev->lock); 2102 } 2103 #endif 2104 in6_ifa_put(ifp); 2105 addrconf_verify(0); 2106 } 2107 } 2108 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2109 in6_dev_put(in6_dev); 2110 } 2111 2112 /* 2113 * Set destination address. 2114 * Special case for SIT interfaces where we create a new "virtual" 2115 * device. 2116 */ 2117 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2118 { 2119 struct in6_ifreq ireq; 2120 struct net_device *dev; 2121 int err = -EINVAL; 2122 2123 rtnl_lock(); 2124 2125 err = -EFAULT; 2126 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2127 goto err_exit; 2128 2129 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2130 2131 err = -ENODEV; 2132 if (dev == NULL) 2133 goto err_exit; 2134 2135 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2136 if (dev->type == ARPHRD_SIT) { 2137 const struct net_device_ops *ops = dev->netdev_ops; 2138 struct ifreq ifr; 2139 struct ip_tunnel_parm p; 2140 2141 err = -EADDRNOTAVAIL; 2142 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2143 goto err_exit; 2144 2145 memset(&p, 0, sizeof(p)); 2146 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2147 p.iph.saddr = 0; 2148 p.iph.version = 4; 2149 p.iph.ihl = 5; 2150 p.iph.protocol = IPPROTO_IPV6; 2151 p.iph.ttl = 64; 2152 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2153 2154 if (ops->ndo_do_ioctl) { 2155 mm_segment_t oldfs = get_fs(); 2156 2157 set_fs(KERNEL_DS); 2158 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2159 set_fs(oldfs); 2160 } else 2161 err = -EOPNOTSUPP; 2162 2163 if (err == 0) { 2164 err = -ENOBUFS; 2165 dev = __dev_get_by_name(net, p.name); 2166 if (!dev) 2167 goto err_exit; 2168 err = dev_open(dev); 2169 } 2170 } 2171 #endif 2172 2173 err_exit: 2174 rtnl_unlock(); 2175 return err; 2176 } 2177 2178 /* 2179 * Manual configuration of address on an interface 2180 */ 2181 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2182 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2183 __u32 valid_lft) 2184 { 2185 struct inet6_ifaddr *ifp; 2186 struct inet6_dev *idev; 2187 struct net_device *dev; 2188 int scope; 2189 u32 flags; 2190 clock_t expires; 2191 unsigned long timeout; 2192 2193 ASSERT_RTNL(); 2194 2195 if (plen > 128) 2196 return -EINVAL; 2197 2198 /* check the lifetime */ 2199 if (!valid_lft || prefered_lft > valid_lft) 2200 return -EINVAL; 2201 2202 dev = __dev_get_by_index(net, ifindex); 2203 if (!dev) 2204 return -ENODEV; 2205 2206 idev = addrconf_add_dev(dev); 2207 if (IS_ERR(idev)) 2208 return PTR_ERR(idev); 2209 2210 scope = ipv6_addr_scope(pfx); 2211 2212 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2213 if (addrconf_finite_timeout(timeout)) { 2214 expires = jiffies_to_clock_t(timeout * HZ); 2215 valid_lft = timeout; 2216 flags = RTF_EXPIRES; 2217 } else { 2218 expires = 0; 2219 flags = 0; 2220 ifa_flags |= IFA_F_PERMANENT; 2221 } 2222 2223 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2224 if (addrconf_finite_timeout(timeout)) { 2225 if (timeout == 0) 2226 ifa_flags |= IFA_F_DEPRECATED; 2227 prefered_lft = timeout; 2228 } 2229 2230 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2231 2232 if (!IS_ERR(ifp)) { 2233 spin_lock_bh(&ifp->lock); 2234 ifp->valid_lft = valid_lft; 2235 ifp->prefered_lft = prefered_lft; 2236 ifp->tstamp = jiffies; 2237 spin_unlock_bh(&ifp->lock); 2238 2239 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2240 expires, flags); 2241 /* 2242 * Note that section 3.1 of RFC 4429 indicates 2243 * that the Optimistic flag should not be set for 2244 * manually configured addresses 2245 */ 2246 addrconf_dad_start(ifp, 0); 2247 in6_ifa_put(ifp); 2248 addrconf_verify(0); 2249 return 0; 2250 } 2251 2252 return PTR_ERR(ifp); 2253 } 2254 2255 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2256 unsigned int plen) 2257 { 2258 struct inet6_ifaddr *ifp; 2259 struct inet6_dev *idev; 2260 struct net_device *dev; 2261 2262 if (plen > 128) 2263 return -EINVAL; 2264 2265 dev = __dev_get_by_index(net, ifindex); 2266 if (!dev) 2267 return -ENODEV; 2268 2269 if ((idev = __in6_dev_get(dev)) == NULL) 2270 return -ENXIO; 2271 2272 read_lock_bh(&idev->lock); 2273 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2274 if (ifp->prefix_len == plen && 2275 ipv6_addr_equal(pfx, &ifp->addr)) { 2276 in6_ifa_hold(ifp); 2277 read_unlock_bh(&idev->lock); 2278 2279 ipv6_del_addr(ifp); 2280 2281 /* If the last address is deleted administratively, 2282 disable IPv6 on this interface. 2283 */ 2284 if (list_empty(&idev->addr_list)) 2285 addrconf_ifdown(idev->dev, 1); 2286 return 0; 2287 } 2288 } 2289 read_unlock_bh(&idev->lock); 2290 return -EADDRNOTAVAIL; 2291 } 2292 2293 2294 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2295 { 2296 struct in6_ifreq ireq; 2297 int err; 2298 2299 if (!capable(CAP_NET_ADMIN)) 2300 return -EPERM; 2301 2302 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2303 return -EFAULT; 2304 2305 rtnl_lock(); 2306 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2307 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2308 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2309 rtnl_unlock(); 2310 return err; 2311 } 2312 2313 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2314 { 2315 struct in6_ifreq ireq; 2316 int err; 2317 2318 if (!capable(CAP_NET_ADMIN)) 2319 return -EPERM; 2320 2321 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2322 return -EFAULT; 2323 2324 rtnl_lock(); 2325 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2326 ireq.ifr6_prefixlen); 2327 rtnl_unlock(); 2328 return err; 2329 } 2330 2331 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2332 int plen, int scope) 2333 { 2334 struct inet6_ifaddr *ifp; 2335 2336 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2337 if (!IS_ERR(ifp)) { 2338 spin_lock_bh(&ifp->lock); 2339 ifp->flags &= ~IFA_F_TENTATIVE; 2340 spin_unlock_bh(&ifp->lock); 2341 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2342 in6_ifa_put(ifp); 2343 } 2344 } 2345 2346 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2347 static void sit_add_v4_addrs(struct inet6_dev *idev) 2348 { 2349 struct in6_addr addr; 2350 struct net_device *dev; 2351 struct net *net = dev_net(idev->dev); 2352 int scope; 2353 2354 ASSERT_RTNL(); 2355 2356 memset(&addr, 0, sizeof(struct in6_addr)); 2357 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2358 2359 if (idev->dev->flags&IFF_POINTOPOINT) { 2360 addr.s6_addr32[0] = htonl(0xfe800000); 2361 scope = IFA_LINK; 2362 } else { 2363 scope = IPV6_ADDR_COMPATv4; 2364 } 2365 2366 if (addr.s6_addr32[3]) { 2367 add_addr(idev, &addr, 128, scope); 2368 return; 2369 } 2370 2371 for_each_netdev(net, dev) { 2372 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2373 if (in_dev && (dev->flags & IFF_UP)) { 2374 struct in_ifaddr * ifa; 2375 2376 int flag = scope; 2377 2378 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2379 int plen; 2380 2381 addr.s6_addr32[3] = ifa->ifa_local; 2382 2383 if (ifa->ifa_scope == RT_SCOPE_LINK) 2384 continue; 2385 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2386 if (idev->dev->flags&IFF_POINTOPOINT) 2387 continue; 2388 flag |= IFA_HOST; 2389 } 2390 if (idev->dev->flags&IFF_POINTOPOINT) 2391 plen = 64; 2392 else 2393 plen = 96; 2394 2395 add_addr(idev, &addr, plen, flag); 2396 } 2397 } 2398 } 2399 } 2400 #endif 2401 2402 static void init_loopback(struct net_device *dev) 2403 { 2404 struct inet6_dev *idev; 2405 2406 /* ::1 */ 2407 2408 ASSERT_RTNL(); 2409 2410 if ((idev = ipv6_find_idev(dev)) == NULL) { 2411 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2412 return; 2413 } 2414 2415 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2416 } 2417 2418 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2419 { 2420 struct inet6_ifaddr * ifp; 2421 u32 addr_flags = IFA_F_PERMANENT; 2422 2423 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2424 if (idev->cnf.optimistic_dad && 2425 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2426 addr_flags |= IFA_F_OPTIMISTIC; 2427 #endif 2428 2429 2430 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2431 if (!IS_ERR(ifp)) { 2432 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2433 addrconf_dad_start(ifp, 0); 2434 in6_ifa_put(ifp); 2435 } 2436 } 2437 2438 static void addrconf_dev_config(struct net_device *dev) 2439 { 2440 struct in6_addr addr; 2441 struct inet6_dev * idev; 2442 2443 ASSERT_RTNL(); 2444 2445 if ((dev->type != ARPHRD_ETHER) && 2446 (dev->type != ARPHRD_FDDI) && 2447 (dev->type != ARPHRD_IEEE802_TR) && 2448 (dev->type != ARPHRD_ARCNET) && 2449 (dev->type != ARPHRD_INFINIBAND)) { 2450 /* Alas, we support only Ethernet autoconfiguration. */ 2451 return; 2452 } 2453 2454 idev = addrconf_add_dev(dev); 2455 if (IS_ERR(idev)) 2456 return; 2457 2458 memset(&addr, 0, sizeof(struct in6_addr)); 2459 addr.s6_addr32[0] = htonl(0xFE800000); 2460 2461 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2462 addrconf_add_linklocal(idev, &addr); 2463 } 2464 2465 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2466 static void addrconf_sit_config(struct net_device *dev) 2467 { 2468 struct inet6_dev *idev; 2469 2470 ASSERT_RTNL(); 2471 2472 /* 2473 * Configure the tunnel with one of our IPv4 2474 * addresses... we should configure all of 2475 * our v4 addrs in the tunnel 2476 */ 2477 2478 if ((idev = ipv6_find_idev(dev)) == NULL) { 2479 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2480 return; 2481 } 2482 2483 if (dev->priv_flags & IFF_ISATAP) { 2484 struct in6_addr addr; 2485 2486 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2487 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2488 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2489 addrconf_add_linklocal(idev, &addr); 2490 return; 2491 } 2492 2493 sit_add_v4_addrs(idev); 2494 2495 if (dev->flags&IFF_POINTOPOINT) { 2496 addrconf_add_mroute(dev); 2497 addrconf_add_lroute(dev); 2498 } else 2499 sit_route_add(dev); 2500 } 2501 #endif 2502 2503 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2504 static void addrconf_gre_config(struct net_device *dev) 2505 { 2506 struct inet6_dev *idev; 2507 struct in6_addr addr; 2508 2509 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name); 2510 2511 ASSERT_RTNL(); 2512 2513 if ((idev = ipv6_find_idev(dev)) == NULL) { 2514 printk(KERN_DEBUG "init gre: add_dev failed\n"); 2515 return; 2516 } 2517 2518 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2519 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2520 2521 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2522 addrconf_add_linklocal(idev, &addr); 2523 } 2524 #endif 2525 2526 static inline int 2527 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2528 { 2529 struct in6_addr lladdr; 2530 2531 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2532 addrconf_add_linklocal(idev, &lladdr); 2533 return 0; 2534 } 2535 return -1; 2536 } 2537 2538 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2539 { 2540 struct net_device *link_dev; 2541 struct net *net = dev_net(idev->dev); 2542 2543 /* first try to inherit the link-local address from the link device */ 2544 if (idev->dev->iflink && 2545 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2546 if (!ipv6_inherit_linklocal(idev, link_dev)) 2547 return; 2548 } 2549 /* then try to inherit it from any device */ 2550 for_each_netdev(net, link_dev) { 2551 if (!ipv6_inherit_linklocal(idev, link_dev)) 2552 return; 2553 } 2554 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2555 } 2556 2557 /* 2558 * Autoconfigure tunnel with a link-local address so routing protocols, 2559 * DHCPv6, MLD etc. can be run over the virtual link 2560 */ 2561 2562 static void addrconf_ip6_tnl_config(struct net_device *dev) 2563 { 2564 struct inet6_dev *idev; 2565 2566 ASSERT_RTNL(); 2567 2568 idev = addrconf_add_dev(dev); 2569 if (IS_ERR(idev)) { 2570 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2571 return; 2572 } 2573 ip6_tnl_add_linklocal(idev); 2574 } 2575 2576 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2577 void * data) 2578 { 2579 struct net_device *dev = (struct net_device *) data; 2580 struct inet6_dev *idev = __in6_dev_get(dev); 2581 int run_pending = 0; 2582 int err; 2583 2584 switch (event) { 2585 case NETDEV_REGISTER: 2586 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2587 idev = ipv6_add_dev(dev); 2588 if (!idev) 2589 return notifier_from_errno(-ENOMEM); 2590 } 2591 break; 2592 2593 case NETDEV_UP: 2594 case NETDEV_CHANGE: 2595 if (dev->flags & IFF_SLAVE) 2596 break; 2597 2598 if (event == NETDEV_UP) { 2599 if (!addrconf_qdisc_ok(dev)) { 2600 /* device is not ready yet. */ 2601 printk(KERN_INFO 2602 "ADDRCONF(NETDEV_UP): %s: " 2603 "link is not ready\n", 2604 dev->name); 2605 break; 2606 } 2607 2608 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2609 idev = ipv6_add_dev(dev); 2610 2611 if (idev) { 2612 idev->if_flags |= IF_READY; 2613 run_pending = 1; 2614 } 2615 } else { 2616 if (!addrconf_qdisc_ok(dev)) { 2617 /* device is still not ready. */ 2618 break; 2619 } 2620 2621 if (idev) { 2622 if (idev->if_flags & IF_READY) 2623 /* device is already configured. */ 2624 break; 2625 idev->if_flags |= IF_READY; 2626 } 2627 2628 printk(KERN_INFO 2629 "ADDRCONF(NETDEV_CHANGE): %s: " 2630 "link becomes ready\n", 2631 dev->name); 2632 2633 run_pending = 1; 2634 } 2635 2636 switch (dev->type) { 2637 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2638 case ARPHRD_SIT: 2639 addrconf_sit_config(dev); 2640 break; 2641 #endif 2642 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2643 case ARPHRD_IPGRE: 2644 addrconf_gre_config(dev); 2645 break; 2646 #endif 2647 case ARPHRD_TUNNEL6: 2648 addrconf_ip6_tnl_config(dev); 2649 break; 2650 case ARPHRD_LOOPBACK: 2651 init_loopback(dev); 2652 break; 2653 2654 default: 2655 addrconf_dev_config(dev); 2656 break; 2657 } 2658 2659 if (idev) { 2660 if (run_pending) 2661 addrconf_dad_run(idev); 2662 2663 /* 2664 * If the MTU changed during the interface down, 2665 * when the interface up, the changed MTU must be 2666 * reflected in the idev as well as routers. 2667 */ 2668 if (idev->cnf.mtu6 != dev->mtu && 2669 dev->mtu >= IPV6_MIN_MTU) { 2670 rt6_mtu_change(dev, dev->mtu); 2671 idev->cnf.mtu6 = dev->mtu; 2672 } 2673 idev->tstamp = jiffies; 2674 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2675 2676 /* 2677 * If the changed mtu during down is lower than 2678 * IPV6_MIN_MTU stop IPv6 on this interface. 2679 */ 2680 if (dev->mtu < IPV6_MIN_MTU) 2681 addrconf_ifdown(dev, 1); 2682 } 2683 break; 2684 2685 case NETDEV_CHANGEMTU: 2686 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2687 rt6_mtu_change(dev, dev->mtu); 2688 idev->cnf.mtu6 = dev->mtu; 2689 break; 2690 } 2691 2692 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2693 idev = ipv6_add_dev(dev); 2694 if (idev) 2695 break; 2696 } 2697 2698 /* 2699 * MTU falled under IPV6_MIN_MTU. 2700 * Stop IPv6 on this interface. 2701 */ 2702 2703 case NETDEV_DOWN: 2704 case NETDEV_UNREGISTER: 2705 /* 2706 * Remove all addresses from this interface. 2707 */ 2708 addrconf_ifdown(dev, event != NETDEV_DOWN); 2709 break; 2710 2711 case NETDEV_CHANGENAME: 2712 if (idev) { 2713 snmp6_unregister_dev(idev); 2714 addrconf_sysctl_unregister(idev); 2715 addrconf_sysctl_register(idev); 2716 err = snmp6_register_dev(idev); 2717 if (err) 2718 return notifier_from_errno(err); 2719 } 2720 break; 2721 2722 case NETDEV_PRE_TYPE_CHANGE: 2723 case NETDEV_POST_TYPE_CHANGE: 2724 addrconf_type_change(dev, event); 2725 break; 2726 } 2727 2728 return NOTIFY_OK; 2729 } 2730 2731 /* 2732 * addrconf module should be notified of a device going up 2733 */ 2734 static struct notifier_block ipv6_dev_notf = { 2735 .notifier_call = addrconf_notify, 2736 }; 2737 2738 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2739 { 2740 struct inet6_dev *idev; 2741 ASSERT_RTNL(); 2742 2743 idev = __in6_dev_get(dev); 2744 2745 if (event == NETDEV_POST_TYPE_CHANGE) 2746 ipv6_mc_remap(idev); 2747 else if (event == NETDEV_PRE_TYPE_CHANGE) 2748 ipv6_mc_unmap(idev); 2749 } 2750 2751 static int addrconf_ifdown(struct net_device *dev, int how) 2752 { 2753 struct net *net = dev_net(dev); 2754 struct inet6_dev *idev; 2755 struct inet6_ifaddr *ifa; 2756 int state, i; 2757 2758 ASSERT_RTNL(); 2759 2760 rt6_ifdown(net, dev); 2761 neigh_ifdown(&nd_tbl, dev); 2762 2763 idev = __in6_dev_get(dev); 2764 if (idev == NULL) 2765 return -ENODEV; 2766 2767 /* 2768 * Step 1: remove reference to ipv6 device from parent device. 2769 * Do not dev_put! 2770 */ 2771 if (how) { 2772 idev->dead = 1; 2773 2774 /* protected by rtnl_lock */ 2775 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2776 2777 /* Step 1.5: remove snmp6 entry */ 2778 snmp6_unregister_dev(idev); 2779 2780 } 2781 2782 /* Step 2: clear hash table */ 2783 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2784 struct hlist_head *h = &inet6_addr_lst[i]; 2785 struct hlist_node *n; 2786 2787 spin_lock_bh(&addrconf_hash_lock); 2788 restart: 2789 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2790 if (ifa->idev == idev) { 2791 hlist_del_init_rcu(&ifa->addr_lst); 2792 addrconf_del_timer(ifa); 2793 goto restart; 2794 } 2795 } 2796 spin_unlock_bh(&addrconf_hash_lock); 2797 } 2798 2799 write_lock_bh(&idev->lock); 2800 2801 /* Step 2: clear flags for stateless addrconf */ 2802 if (!how) 2803 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2804 2805 #ifdef CONFIG_IPV6_PRIVACY 2806 if (how && del_timer(&idev->regen_timer)) 2807 in6_dev_put(idev); 2808 2809 /* Step 3: clear tempaddr list */ 2810 while (!list_empty(&idev->tempaddr_list)) { 2811 ifa = list_first_entry(&idev->tempaddr_list, 2812 struct inet6_ifaddr, tmp_list); 2813 list_del(&ifa->tmp_list); 2814 write_unlock_bh(&idev->lock); 2815 spin_lock_bh(&ifa->lock); 2816 2817 if (ifa->ifpub) { 2818 in6_ifa_put(ifa->ifpub); 2819 ifa->ifpub = NULL; 2820 } 2821 spin_unlock_bh(&ifa->lock); 2822 in6_ifa_put(ifa); 2823 write_lock_bh(&idev->lock); 2824 } 2825 #endif 2826 2827 while (!list_empty(&idev->addr_list)) { 2828 ifa = list_first_entry(&idev->addr_list, 2829 struct inet6_ifaddr, if_list); 2830 addrconf_del_timer(ifa); 2831 2832 list_del(&ifa->if_list); 2833 2834 write_unlock_bh(&idev->lock); 2835 2836 spin_lock_bh(&ifa->state_lock); 2837 state = ifa->state; 2838 ifa->state = INET6_IFADDR_STATE_DEAD; 2839 spin_unlock_bh(&ifa->state_lock); 2840 2841 if (state != INET6_IFADDR_STATE_DEAD) { 2842 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2843 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2844 } 2845 in6_ifa_put(ifa); 2846 2847 write_lock_bh(&idev->lock); 2848 } 2849 2850 write_unlock_bh(&idev->lock); 2851 2852 /* Step 5: Discard multicast list */ 2853 if (how) 2854 ipv6_mc_destroy_dev(idev); 2855 else 2856 ipv6_mc_down(idev); 2857 2858 idev->tstamp = jiffies; 2859 2860 /* Last: Shot the device (if unregistered) */ 2861 if (how) { 2862 addrconf_sysctl_unregister(idev); 2863 neigh_parms_release(&nd_tbl, idev->nd_parms); 2864 neigh_ifdown(&nd_tbl, dev); 2865 in6_dev_put(idev); 2866 } 2867 return 0; 2868 } 2869 2870 static void addrconf_rs_timer(unsigned long data) 2871 { 2872 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2873 struct inet6_dev *idev = ifp->idev; 2874 2875 read_lock(&idev->lock); 2876 if (idev->dead || !(idev->if_flags & IF_READY)) 2877 goto out; 2878 2879 if (idev->cnf.forwarding) 2880 goto out; 2881 2882 /* Announcement received after solicitation was sent */ 2883 if (idev->if_flags & IF_RA_RCVD) 2884 goto out; 2885 2886 spin_lock(&ifp->lock); 2887 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2888 /* The wait after the last probe can be shorter */ 2889 addrconf_mod_timer(ifp, AC_RS, 2890 (ifp->probes == idev->cnf.rtr_solicits) ? 2891 idev->cnf.rtr_solicit_delay : 2892 idev->cnf.rtr_solicit_interval); 2893 spin_unlock(&ifp->lock); 2894 2895 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2896 } else { 2897 spin_unlock(&ifp->lock); 2898 /* 2899 * Note: we do not support deprecated "all on-link" 2900 * assumption any longer. 2901 */ 2902 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2903 idev->dev->name); 2904 } 2905 2906 out: 2907 read_unlock(&idev->lock); 2908 in6_ifa_put(ifp); 2909 } 2910 2911 /* 2912 * Duplicate Address Detection 2913 */ 2914 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2915 { 2916 unsigned long rand_num; 2917 struct inet6_dev *idev = ifp->idev; 2918 2919 if (ifp->flags & IFA_F_OPTIMISTIC) 2920 rand_num = 0; 2921 else 2922 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2923 2924 ifp->probes = idev->cnf.dad_transmits; 2925 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2926 } 2927 2928 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2929 { 2930 struct inet6_dev *idev = ifp->idev; 2931 struct net_device *dev = idev->dev; 2932 2933 addrconf_join_solict(dev, &ifp->addr); 2934 2935 net_srandom(ifp->addr.s6_addr32[3]); 2936 2937 read_lock_bh(&idev->lock); 2938 spin_lock(&ifp->lock); 2939 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2940 goto out; 2941 2942 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2943 idev->cnf.accept_dad < 1 || 2944 !(ifp->flags&IFA_F_TENTATIVE) || 2945 ifp->flags & IFA_F_NODAD) { 2946 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2947 spin_unlock(&ifp->lock); 2948 read_unlock_bh(&idev->lock); 2949 2950 addrconf_dad_completed(ifp); 2951 return; 2952 } 2953 2954 if (!(idev->if_flags & IF_READY)) { 2955 spin_unlock(&ifp->lock); 2956 read_unlock_bh(&idev->lock); 2957 /* 2958 * If the device is not ready: 2959 * - keep it tentative if it is a permanent address. 2960 * - otherwise, kill it. 2961 */ 2962 in6_ifa_hold(ifp); 2963 addrconf_dad_stop(ifp, 0); 2964 return; 2965 } 2966 2967 /* 2968 * Optimistic nodes can start receiving 2969 * Frames right away 2970 */ 2971 if (ifp->flags & IFA_F_OPTIMISTIC) 2972 ip6_ins_rt(ifp->rt); 2973 2974 addrconf_dad_kick(ifp); 2975 out: 2976 spin_unlock(&ifp->lock); 2977 read_unlock_bh(&idev->lock); 2978 } 2979 2980 static void addrconf_dad_timer(unsigned long data) 2981 { 2982 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2983 struct inet6_dev *idev = ifp->idev; 2984 struct in6_addr mcaddr; 2985 2986 if (!ifp->probes && addrconf_dad_end(ifp)) 2987 goto out; 2988 2989 read_lock(&idev->lock); 2990 if (idev->dead || !(idev->if_flags & IF_READY)) { 2991 read_unlock(&idev->lock); 2992 goto out; 2993 } 2994 2995 spin_lock(&ifp->lock); 2996 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2997 spin_unlock(&ifp->lock); 2998 read_unlock(&idev->lock); 2999 goto out; 3000 } 3001 3002 if (ifp->probes == 0) { 3003 /* 3004 * DAD was successful 3005 */ 3006 3007 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3008 spin_unlock(&ifp->lock); 3009 read_unlock(&idev->lock); 3010 3011 addrconf_dad_completed(ifp); 3012 3013 goto out; 3014 } 3015 3016 ifp->probes--; 3017 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3018 spin_unlock(&ifp->lock); 3019 read_unlock(&idev->lock); 3020 3021 /* send a neighbour solicitation for our addr */ 3022 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3023 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3024 out: 3025 in6_ifa_put(ifp); 3026 } 3027 3028 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3029 { 3030 struct net_device *dev = ifp->idev->dev; 3031 3032 /* 3033 * Configure the address for reception. Now it is valid. 3034 */ 3035 3036 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3037 3038 /* If added prefix is link local and we are prepared to process 3039 router advertisements, start sending router solicitations. 3040 */ 3041 3042 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) || 3043 ifp->idev->cnf.accept_ra == 2) && 3044 ifp->idev->cnf.rtr_solicits > 0 && 3045 (dev->flags&IFF_LOOPBACK) == 0 && 3046 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3047 /* 3048 * If a host as already performed a random delay 3049 * [...] as part of DAD [...] there is no need 3050 * to delay again before sending the first RS 3051 */ 3052 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3053 3054 spin_lock_bh(&ifp->lock); 3055 ifp->probes = 1; 3056 ifp->idev->if_flags |= IF_RS_SENT; 3057 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3058 spin_unlock_bh(&ifp->lock); 3059 } 3060 } 3061 3062 static void addrconf_dad_run(struct inet6_dev *idev) 3063 { 3064 struct inet6_ifaddr *ifp; 3065 3066 read_lock_bh(&idev->lock); 3067 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3068 spin_lock(&ifp->lock); 3069 if (ifp->flags & IFA_F_TENTATIVE && 3070 ifp->state == INET6_IFADDR_STATE_DAD) 3071 addrconf_dad_kick(ifp); 3072 spin_unlock(&ifp->lock); 3073 } 3074 read_unlock_bh(&idev->lock); 3075 } 3076 3077 #ifdef CONFIG_PROC_FS 3078 struct if6_iter_state { 3079 struct seq_net_private p; 3080 int bucket; 3081 }; 3082 3083 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 3084 { 3085 struct inet6_ifaddr *ifa = NULL; 3086 struct if6_iter_state *state = seq->private; 3087 struct net *net = seq_file_net(seq); 3088 3089 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3090 struct hlist_node *n; 3091 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3092 addr_lst) 3093 if (net_eq(dev_net(ifa->idev->dev), net)) 3094 return ifa; 3095 } 3096 return NULL; 3097 } 3098 3099 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3100 struct inet6_ifaddr *ifa) 3101 { 3102 struct if6_iter_state *state = seq->private; 3103 struct net *net = seq_file_net(seq); 3104 struct hlist_node *n = &ifa->addr_lst; 3105 3106 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) 3107 if (net_eq(dev_net(ifa->idev->dev), net)) 3108 return ifa; 3109 3110 while (++state->bucket < IN6_ADDR_HSIZE) { 3111 hlist_for_each_entry_rcu_bh(ifa, n, 3112 &inet6_addr_lst[state->bucket], addr_lst) { 3113 if (net_eq(dev_net(ifa->idev->dev), net)) 3114 return ifa; 3115 } 3116 } 3117 3118 return NULL; 3119 } 3120 3121 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 3122 { 3123 struct inet6_ifaddr *ifa = if6_get_first(seq); 3124 3125 if (ifa) 3126 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL) 3127 --pos; 3128 return pos ? NULL : ifa; 3129 } 3130 3131 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3132 __acquires(rcu_bh) 3133 { 3134 rcu_read_lock_bh(); 3135 return if6_get_idx(seq, *pos); 3136 } 3137 3138 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3139 { 3140 struct inet6_ifaddr *ifa; 3141 3142 ifa = if6_get_next(seq, v); 3143 ++*pos; 3144 return ifa; 3145 } 3146 3147 static void if6_seq_stop(struct seq_file *seq, void *v) 3148 __releases(rcu_bh) 3149 { 3150 rcu_read_unlock_bh(); 3151 } 3152 3153 static int if6_seq_show(struct seq_file *seq, void *v) 3154 { 3155 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3156 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3157 &ifp->addr, 3158 ifp->idev->dev->ifindex, 3159 ifp->prefix_len, 3160 ifp->scope, 3161 ifp->flags, 3162 ifp->idev->dev->name); 3163 return 0; 3164 } 3165 3166 static const struct seq_operations if6_seq_ops = { 3167 .start = if6_seq_start, 3168 .next = if6_seq_next, 3169 .show = if6_seq_show, 3170 .stop = if6_seq_stop, 3171 }; 3172 3173 static int if6_seq_open(struct inode *inode, struct file *file) 3174 { 3175 return seq_open_net(inode, file, &if6_seq_ops, 3176 sizeof(struct if6_iter_state)); 3177 } 3178 3179 static const struct file_operations if6_fops = { 3180 .owner = THIS_MODULE, 3181 .open = if6_seq_open, 3182 .read = seq_read, 3183 .llseek = seq_lseek, 3184 .release = seq_release_net, 3185 }; 3186 3187 static int __net_init if6_proc_net_init(struct net *net) 3188 { 3189 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3190 return -ENOMEM; 3191 return 0; 3192 } 3193 3194 static void __net_exit if6_proc_net_exit(struct net *net) 3195 { 3196 proc_net_remove(net, "if_inet6"); 3197 } 3198 3199 static struct pernet_operations if6_proc_net_ops = { 3200 .init = if6_proc_net_init, 3201 .exit = if6_proc_net_exit, 3202 }; 3203 3204 int __init if6_proc_init(void) 3205 { 3206 return register_pernet_subsys(&if6_proc_net_ops); 3207 } 3208 3209 void if6_proc_exit(void) 3210 { 3211 unregister_pernet_subsys(&if6_proc_net_ops); 3212 } 3213 #endif /* CONFIG_PROC_FS */ 3214 3215 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3216 /* Check if address is a home address configured on any interface. */ 3217 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3218 { 3219 int ret = 0; 3220 struct inet6_ifaddr *ifp = NULL; 3221 struct hlist_node *n; 3222 unsigned int hash = ipv6_addr_hash(addr); 3223 3224 rcu_read_lock_bh(); 3225 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3226 if (!net_eq(dev_net(ifp->idev->dev), net)) 3227 continue; 3228 if (ipv6_addr_equal(&ifp->addr, addr) && 3229 (ifp->flags & IFA_F_HOMEADDRESS)) { 3230 ret = 1; 3231 break; 3232 } 3233 } 3234 rcu_read_unlock_bh(); 3235 return ret; 3236 } 3237 #endif 3238 3239 /* 3240 * Periodic address status verification 3241 */ 3242 3243 static void addrconf_verify(unsigned long foo) 3244 { 3245 unsigned long now, next, next_sec, next_sched; 3246 struct inet6_ifaddr *ifp; 3247 struct hlist_node *node; 3248 int i; 3249 3250 rcu_read_lock_bh(); 3251 spin_lock(&addrconf_verify_lock); 3252 now = jiffies; 3253 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3254 3255 del_timer(&addr_chk_timer); 3256 3257 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3258 restart: 3259 hlist_for_each_entry_rcu_bh(ifp, node, 3260 &inet6_addr_lst[i], addr_lst) { 3261 unsigned long age; 3262 3263 if (ifp->flags & IFA_F_PERMANENT) 3264 continue; 3265 3266 spin_lock(&ifp->lock); 3267 /* We try to batch several events at once. */ 3268 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3269 3270 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3271 age >= ifp->valid_lft) { 3272 spin_unlock(&ifp->lock); 3273 in6_ifa_hold(ifp); 3274 ipv6_del_addr(ifp); 3275 goto restart; 3276 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3277 spin_unlock(&ifp->lock); 3278 continue; 3279 } else if (age >= ifp->prefered_lft) { 3280 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3281 int deprecate = 0; 3282 3283 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3284 deprecate = 1; 3285 ifp->flags |= IFA_F_DEPRECATED; 3286 } 3287 3288 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3289 next = ifp->tstamp + ifp->valid_lft * HZ; 3290 3291 spin_unlock(&ifp->lock); 3292 3293 if (deprecate) { 3294 in6_ifa_hold(ifp); 3295 3296 ipv6_ifa_notify(0, ifp); 3297 in6_ifa_put(ifp); 3298 goto restart; 3299 } 3300 #ifdef CONFIG_IPV6_PRIVACY 3301 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3302 !(ifp->flags&IFA_F_TENTATIVE)) { 3303 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3304 ifp->idev->cnf.dad_transmits * 3305 ifp->idev->nd_parms->retrans_time / HZ; 3306 3307 if (age >= ifp->prefered_lft - regen_advance) { 3308 struct inet6_ifaddr *ifpub = ifp->ifpub; 3309 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3310 next = ifp->tstamp + ifp->prefered_lft * HZ; 3311 if (!ifp->regen_count && ifpub) { 3312 ifp->regen_count++; 3313 in6_ifa_hold(ifp); 3314 in6_ifa_hold(ifpub); 3315 spin_unlock(&ifp->lock); 3316 3317 spin_lock(&ifpub->lock); 3318 ifpub->regen_count = 0; 3319 spin_unlock(&ifpub->lock); 3320 ipv6_create_tempaddr(ifpub, ifp); 3321 in6_ifa_put(ifpub); 3322 in6_ifa_put(ifp); 3323 goto restart; 3324 } 3325 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3326 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3327 spin_unlock(&ifp->lock); 3328 #endif 3329 } else { 3330 /* ifp->prefered_lft <= ifp->valid_lft */ 3331 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3332 next = ifp->tstamp + ifp->prefered_lft * HZ; 3333 spin_unlock(&ifp->lock); 3334 } 3335 } 3336 } 3337 3338 next_sec = round_jiffies_up(next); 3339 next_sched = next; 3340 3341 /* If rounded timeout is accurate enough, accept it. */ 3342 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3343 next_sched = next_sec; 3344 3345 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3346 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3347 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3348 3349 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3350 now, next, next_sec, next_sched)); 3351 3352 addr_chk_timer.expires = next_sched; 3353 add_timer(&addr_chk_timer); 3354 spin_unlock(&addrconf_verify_lock); 3355 rcu_read_unlock_bh(); 3356 } 3357 3358 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3359 { 3360 struct in6_addr *pfx = NULL; 3361 3362 if (addr) 3363 pfx = nla_data(addr); 3364 3365 if (local) { 3366 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3367 pfx = NULL; 3368 else 3369 pfx = nla_data(local); 3370 } 3371 3372 return pfx; 3373 } 3374 3375 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3376 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3377 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3378 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3379 }; 3380 3381 static int 3382 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3383 { 3384 struct net *net = sock_net(skb->sk); 3385 struct ifaddrmsg *ifm; 3386 struct nlattr *tb[IFA_MAX+1]; 3387 struct in6_addr *pfx; 3388 int err; 3389 3390 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3391 if (err < 0) 3392 return err; 3393 3394 ifm = nlmsg_data(nlh); 3395 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3396 if (pfx == NULL) 3397 return -EINVAL; 3398 3399 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3400 } 3401 3402 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3403 u32 prefered_lft, u32 valid_lft) 3404 { 3405 u32 flags; 3406 clock_t expires; 3407 unsigned long timeout; 3408 3409 if (!valid_lft || (prefered_lft > valid_lft)) 3410 return -EINVAL; 3411 3412 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3413 if (addrconf_finite_timeout(timeout)) { 3414 expires = jiffies_to_clock_t(timeout * HZ); 3415 valid_lft = timeout; 3416 flags = RTF_EXPIRES; 3417 } else { 3418 expires = 0; 3419 flags = 0; 3420 ifa_flags |= IFA_F_PERMANENT; 3421 } 3422 3423 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3424 if (addrconf_finite_timeout(timeout)) { 3425 if (timeout == 0) 3426 ifa_flags |= IFA_F_DEPRECATED; 3427 prefered_lft = timeout; 3428 } 3429 3430 spin_lock_bh(&ifp->lock); 3431 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3432 ifp->tstamp = jiffies; 3433 ifp->valid_lft = valid_lft; 3434 ifp->prefered_lft = prefered_lft; 3435 3436 spin_unlock_bh(&ifp->lock); 3437 if (!(ifp->flags&IFA_F_TENTATIVE)) 3438 ipv6_ifa_notify(0, ifp); 3439 3440 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3441 expires, flags); 3442 addrconf_verify(0); 3443 3444 return 0; 3445 } 3446 3447 static int 3448 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3449 { 3450 struct net *net = sock_net(skb->sk); 3451 struct ifaddrmsg *ifm; 3452 struct nlattr *tb[IFA_MAX+1]; 3453 struct in6_addr *pfx; 3454 struct inet6_ifaddr *ifa; 3455 struct net_device *dev; 3456 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3457 u8 ifa_flags; 3458 int err; 3459 3460 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3461 if (err < 0) 3462 return err; 3463 3464 ifm = nlmsg_data(nlh); 3465 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3466 if (pfx == NULL) 3467 return -EINVAL; 3468 3469 if (tb[IFA_CACHEINFO]) { 3470 struct ifa_cacheinfo *ci; 3471 3472 ci = nla_data(tb[IFA_CACHEINFO]); 3473 valid_lft = ci->ifa_valid; 3474 preferred_lft = ci->ifa_prefered; 3475 } else { 3476 preferred_lft = INFINITY_LIFE_TIME; 3477 valid_lft = INFINITY_LIFE_TIME; 3478 } 3479 3480 dev = __dev_get_by_index(net, ifm->ifa_index); 3481 if (dev == NULL) 3482 return -ENODEV; 3483 3484 /* We ignore other flags so far. */ 3485 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3486 3487 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3488 if (ifa == NULL) { 3489 /* 3490 * It would be best to check for !NLM_F_CREATE here but 3491 * userspace alreay relies on not having to provide this. 3492 */ 3493 return inet6_addr_add(net, ifm->ifa_index, pfx, 3494 ifm->ifa_prefixlen, ifa_flags, 3495 preferred_lft, valid_lft); 3496 } 3497 3498 if (nlh->nlmsg_flags & NLM_F_EXCL || 3499 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3500 err = -EEXIST; 3501 else 3502 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3503 3504 in6_ifa_put(ifa); 3505 3506 return err; 3507 } 3508 3509 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3510 u8 scope, int ifindex) 3511 { 3512 struct ifaddrmsg *ifm; 3513 3514 ifm = nlmsg_data(nlh); 3515 ifm->ifa_family = AF_INET6; 3516 ifm->ifa_prefixlen = prefixlen; 3517 ifm->ifa_flags = flags; 3518 ifm->ifa_scope = scope; 3519 ifm->ifa_index = ifindex; 3520 } 3521 3522 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3523 unsigned long tstamp, u32 preferred, u32 valid) 3524 { 3525 struct ifa_cacheinfo ci; 3526 3527 ci.cstamp = cstamp_delta(cstamp); 3528 ci.tstamp = cstamp_delta(tstamp); 3529 ci.ifa_prefered = preferred; 3530 ci.ifa_valid = valid; 3531 3532 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3533 } 3534 3535 static inline int rt_scope(int ifa_scope) 3536 { 3537 if (ifa_scope & IFA_HOST) 3538 return RT_SCOPE_HOST; 3539 else if (ifa_scope & IFA_LINK) 3540 return RT_SCOPE_LINK; 3541 else if (ifa_scope & IFA_SITE) 3542 return RT_SCOPE_SITE; 3543 else 3544 return RT_SCOPE_UNIVERSE; 3545 } 3546 3547 static inline int inet6_ifaddr_msgsize(void) 3548 { 3549 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3550 + nla_total_size(16) /* IFA_ADDRESS */ 3551 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3552 } 3553 3554 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3555 u32 pid, u32 seq, int event, unsigned int flags) 3556 { 3557 struct nlmsghdr *nlh; 3558 u32 preferred, valid; 3559 3560 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3561 if (nlh == NULL) 3562 return -EMSGSIZE; 3563 3564 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3565 ifa->idev->dev->ifindex); 3566 3567 if (!(ifa->flags&IFA_F_PERMANENT)) { 3568 preferred = ifa->prefered_lft; 3569 valid = ifa->valid_lft; 3570 if (preferred != INFINITY_LIFE_TIME) { 3571 long tval = (jiffies - ifa->tstamp)/HZ; 3572 if (preferred > tval) 3573 preferred -= tval; 3574 else 3575 preferred = 0; 3576 if (valid != INFINITY_LIFE_TIME) { 3577 if (valid > tval) 3578 valid -= tval; 3579 else 3580 valid = 0; 3581 } 3582 } 3583 } else { 3584 preferred = INFINITY_LIFE_TIME; 3585 valid = INFINITY_LIFE_TIME; 3586 } 3587 3588 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3589 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3590 nlmsg_cancel(skb, nlh); 3591 return -EMSGSIZE; 3592 } 3593 3594 return nlmsg_end(skb, nlh); 3595 } 3596 3597 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3598 u32 pid, u32 seq, int event, u16 flags) 3599 { 3600 struct nlmsghdr *nlh; 3601 u8 scope = RT_SCOPE_UNIVERSE; 3602 int ifindex = ifmca->idev->dev->ifindex; 3603 3604 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3605 scope = RT_SCOPE_SITE; 3606 3607 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3608 if (nlh == NULL) 3609 return -EMSGSIZE; 3610 3611 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3612 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3613 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3614 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3615 nlmsg_cancel(skb, nlh); 3616 return -EMSGSIZE; 3617 } 3618 3619 return nlmsg_end(skb, nlh); 3620 } 3621 3622 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3623 u32 pid, u32 seq, int event, unsigned int flags) 3624 { 3625 struct nlmsghdr *nlh; 3626 u8 scope = RT_SCOPE_UNIVERSE; 3627 int ifindex = ifaca->aca_idev->dev->ifindex; 3628 3629 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3630 scope = RT_SCOPE_SITE; 3631 3632 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3633 if (nlh == NULL) 3634 return -EMSGSIZE; 3635 3636 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3637 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3638 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3639 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3640 nlmsg_cancel(skb, nlh); 3641 return -EMSGSIZE; 3642 } 3643 3644 return nlmsg_end(skb, nlh); 3645 } 3646 3647 enum addr_type_t { 3648 UNICAST_ADDR, 3649 MULTICAST_ADDR, 3650 ANYCAST_ADDR, 3651 }; 3652 3653 /* called with rcu_read_lock() */ 3654 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3655 struct netlink_callback *cb, enum addr_type_t type, 3656 int s_ip_idx, int *p_ip_idx) 3657 { 3658 struct ifmcaddr6 *ifmca; 3659 struct ifacaddr6 *ifaca; 3660 int err = 1; 3661 int ip_idx = *p_ip_idx; 3662 3663 read_lock_bh(&idev->lock); 3664 switch (type) { 3665 case UNICAST_ADDR: { 3666 struct inet6_ifaddr *ifa; 3667 3668 /* unicast address incl. temp addr */ 3669 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3670 if (++ip_idx < s_ip_idx) 3671 continue; 3672 err = inet6_fill_ifaddr(skb, ifa, 3673 NETLINK_CB(cb->skb).pid, 3674 cb->nlh->nlmsg_seq, 3675 RTM_NEWADDR, 3676 NLM_F_MULTI); 3677 if (err <= 0) 3678 break; 3679 } 3680 break; 3681 } 3682 case MULTICAST_ADDR: 3683 /* multicast address */ 3684 for (ifmca = idev->mc_list; ifmca; 3685 ifmca = ifmca->next, ip_idx++) { 3686 if (ip_idx < s_ip_idx) 3687 continue; 3688 err = inet6_fill_ifmcaddr(skb, ifmca, 3689 NETLINK_CB(cb->skb).pid, 3690 cb->nlh->nlmsg_seq, 3691 RTM_GETMULTICAST, 3692 NLM_F_MULTI); 3693 if (err <= 0) 3694 break; 3695 } 3696 break; 3697 case ANYCAST_ADDR: 3698 /* anycast address */ 3699 for (ifaca = idev->ac_list; ifaca; 3700 ifaca = ifaca->aca_next, ip_idx++) { 3701 if (ip_idx < s_ip_idx) 3702 continue; 3703 err = inet6_fill_ifacaddr(skb, ifaca, 3704 NETLINK_CB(cb->skb).pid, 3705 cb->nlh->nlmsg_seq, 3706 RTM_GETANYCAST, 3707 NLM_F_MULTI); 3708 if (err <= 0) 3709 break; 3710 } 3711 break; 3712 default: 3713 break; 3714 } 3715 read_unlock_bh(&idev->lock); 3716 *p_ip_idx = ip_idx; 3717 return err; 3718 } 3719 3720 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3721 enum addr_type_t type) 3722 { 3723 struct net *net = sock_net(skb->sk); 3724 int h, s_h; 3725 int idx, ip_idx; 3726 int s_idx, s_ip_idx; 3727 struct net_device *dev; 3728 struct inet6_dev *idev; 3729 struct hlist_head *head; 3730 struct hlist_node *node; 3731 3732 s_h = cb->args[0]; 3733 s_idx = idx = cb->args[1]; 3734 s_ip_idx = ip_idx = cb->args[2]; 3735 3736 rcu_read_lock(); 3737 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3738 idx = 0; 3739 head = &net->dev_index_head[h]; 3740 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3741 if (idx < s_idx) 3742 goto cont; 3743 if (h > s_h || idx > s_idx) 3744 s_ip_idx = 0; 3745 ip_idx = 0; 3746 idev = __in6_dev_get(dev); 3747 if (!idev) 3748 goto cont; 3749 3750 if (in6_dump_addrs(idev, skb, cb, type, 3751 s_ip_idx, &ip_idx) <= 0) 3752 goto done; 3753 cont: 3754 idx++; 3755 } 3756 } 3757 done: 3758 rcu_read_unlock(); 3759 cb->args[0] = h; 3760 cb->args[1] = idx; 3761 cb->args[2] = ip_idx; 3762 3763 return skb->len; 3764 } 3765 3766 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3767 { 3768 enum addr_type_t type = UNICAST_ADDR; 3769 3770 return inet6_dump_addr(skb, cb, type); 3771 } 3772 3773 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3774 { 3775 enum addr_type_t type = MULTICAST_ADDR; 3776 3777 return inet6_dump_addr(skb, cb, type); 3778 } 3779 3780 3781 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3782 { 3783 enum addr_type_t type = ANYCAST_ADDR; 3784 3785 return inet6_dump_addr(skb, cb, type); 3786 } 3787 3788 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3789 void *arg) 3790 { 3791 struct net *net = sock_net(in_skb->sk); 3792 struct ifaddrmsg *ifm; 3793 struct nlattr *tb[IFA_MAX+1]; 3794 struct in6_addr *addr = NULL; 3795 struct net_device *dev = NULL; 3796 struct inet6_ifaddr *ifa; 3797 struct sk_buff *skb; 3798 int err; 3799 3800 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3801 if (err < 0) 3802 goto errout; 3803 3804 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3805 if (addr == NULL) { 3806 err = -EINVAL; 3807 goto errout; 3808 } 3809 3810 ifm = nlmsg_data(nlh); 3811 if (ifm->ifa_index) 3812 dev = __dev_get_by_index(net, ifm->ifa_index); 3813 3814 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3815 if (!ifa) { 3816 err = -EADDRNOTAVAIL; 3817 goto errout; 3818 } 3819 3820 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3821 if (!skb) { 3822 err = -ENOBUFS; 3823 goto errout_ifa; 3824 } 3825 3826 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3827 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3828 if (err < 0) { 3829 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3830 WARN_ON(err == -EMSGSIZE); 3831 kfree_skb(skb); 3832 goto errout_ifa; 3833 } 3834 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3835 errout_ifa: 3836 in6_ifa_put(ifa); 3837 errout: 3838 return err; 3839 } 3840 3841 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3842 { 3843 struct sk_buff *skb; 3844 struct net *net = dev_net(ifa->idev->dev); 3845 int err = -ENOBUFS; 3846 3847 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3848 if (skb == NULL) 3849 goto errout; 3850 3851 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3852 if (err < 0) { 3853 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3854 WARN_ON(err == -EMSGSIZE); 3855 kfree_skb(skb); 3856 goto errout; 3857 } 3858 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3859 return; 3860 errout: 3861 if (err < 0) 3862 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3863 } 3864 3865 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3866 __s32 *array, int bytes) 3867 { 3868 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3869 3870 memset(array, 0, bytes); 3871 array[DEVCONF_FORWARDING] = cnf->forwarding; 3872 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3873 array[DEVCONF_MTU6] = cnf->mtu6; 3874 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3875 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3876 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3877 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3878 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3879 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3880 jiffies_to_msecs(cnf->rtr_solicit_interval); 3881 array[DEVCONF_RTR_SOLICIT_DELAY] = 3882 jiffies_to_msecs(cnf->rtr_solicit_delay); 3883 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3884 #ifdef CONFIG_IPV6_PRIVACY 3885 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3886 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3887 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3888 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3889 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3890 #endif 3891 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3892 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3893 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3894 #ifdef CONFIG_IPV6_ROUTER_PREF 3895 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3896 array[DEVCONF_RTR_PROBE_INTERVAL] = 3897 jiffies_to_msecs(cnf->rtr_probe_interval); 3898 #ifdef CONFIG_IPV6_ROUTE_INFO 3899 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3900 #endif 3901 #endif 3902 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3903 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3904 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3905 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3906 #endif 3907 #ifdef CONFIG_IPV6_MROUTE 3908 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3909 #endif 3910 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3911 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3912 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3913 } 3914 3915 static inline size_t inet6_ifla6_size(void) 3916 { 3917 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3918 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3919 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3920 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3921 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3922 } 3923 3924 static inline size_t inet6_if_nlmsg_size(void) 3925 { 3926 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3927 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3928 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3929 + nla_total_size(4) /* IFLA_MTU */ 3930 + nla_total_size(4) /* IFLA_LINK */ 3931 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3932 } 3933 3934 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3935 int items, int bytes) 3936 { 3937 int i; 3938 int pad = bytes - sizeof(u64) * items; 3939 BUG_ON(pad < 0); 3940 3941 /* Use put_unaligned() because stats may not be aligned for u64. */ 3942 put_unaligned(items, &stats[0]); 3943 for (i = 1; i < items; i++) 3944 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3945 3946 memset(&stats[items], 0, pad); 3947 } 3948 3949 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3950 int items, int bytes, size_t syncpoff) 3951 { 3952 int i; 3953 int pad = bytes - sizeof(u64) * items; 3954 BUG_ON(pad < 0); 3955 3956 /* Use put_unaligned() because stats may not be aligned for u64. */ 3957 put_unaligned(items, &stats[0]); 3958 for (i = 1; i < items; i++) 3959 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3960 3961 memset(&stats[items], 0, pad); 3962 } 3963 3964 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3965 int bytes) 3966 { 3967 switch (attrtype) { 3968 case IFLA_INET6_STATS: 3969 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3970 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3971 break; 3972 case IFLA_INET6_ICMP6STATS: 3973 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3974 break; 3975 } 3976 } 3977 3978 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3979 { 3980 struct nlattr *nla; 3981 struct ifla_cacheinfo ci; 3982 3983 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3984 3985 ci.max_reasm_len = IPV6_MAXPLEN; 3986 ci.tstamp = cstamp_delta(idev->tstamp); 3987 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3988 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3989 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3990 3991 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3992 if (nla == NULL) 3993 goto nla_put_failure; 3994 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3995 3996 /* XXX - MC not implemented */ 3997 3998 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3999 if (nla == NULL) 4000 goto nla_put_failure; 4001 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4002 4003 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4004 if (nla == NULL) 4005 goto nla_put_failure; 4006 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4007 4008 return 0; 4009 4010 nla_put_failure: 4011 return -EMSGSIZE; 4012 } 4013 4014 static size_t inet6_get_link_af_size(const struct net_device *dev) 4015 { 4016 if (!__in6_dev_get(dev)) 4017 return 0; 4018 4019 return inet6_ifla6_size(); 4020 } 4021 4022 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4023 { 4024 struct inet6_dev *idev = __in6_dev_get(dev); 4025 4026 if (!idev) 4027 return -ENODATA; 4028 4029 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4030 return -EMSGSIZE; 4031 4032 return 0; 4033 } 4034 4035 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4036 u32 pid, u32 seq, int event, unsigned int flags) 4037 { 4038 struct net_device *dev = idev->dev; 4039 struct ifinfomsg *hdr; 4040 struct nlmsghdr *nlh; 4041 void *protoinfo; 4042 4043 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 4044 if (nlh == NULL) 4045 return -EMSGSIZE; 4046 4047 hdr = nlmsg_data(nlh); 4048 hdr->ifi_family = AF_INET6; 4049 hdr->__ifi_pad = 0; 4050 hdr->ifi_type = dev->type; 4051 hdr->ifi_index = dev->ifindex; 4052 hdr->ifi_flags = dev_get_flags(dev); 4053 hdr->ifi_change = 0; 4054 4055 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 4056 4057 if (dev->addr_len) 4058 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 4059 4060 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 4061 if (dev->ifindex != dev->iflink) 4062 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 4063 4064 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4065 if (protoinfo == NULL) 4066 goto nla_put_failure; 4067 4068 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4069 goto nla_put_failure; 4070 4071 nla_nest_end(skb, protoinfo); 4072 return nlmsg_end(skb, nlh); 4073 4074 nla_put_failure: 4075 nlmsg_cancel(skb, nlh); 4076 return -EMSGSIZE; 4077 } 4078 4079 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4080 { 4081 struct net *net = sock_net(skb->sk); 4082 int h, s_h; 4083 int idx = 0, s_idx; 4084 struct net_device *dev; 4085 struct inet6_dev *idev; 4086 struct hlist_head *head; 4087 struct hlist_node *node; 4088 4089 s_h = cb->args[0]; 4090 s_idx = cb->args[1]; 4091 4092 rcu_read_lock(); 4093 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4094 idx = 0; 4095 head = &net->dev_index_head[h]; 4096 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4097 if (idx < s_idx) 4098 goto cont; 4099 idev = __in6_dev_get(dev); 4100 if (!idev) 4101 goto cont; 4102 if (inet6_fill_ifinfo(skb, idev, 4103 NETLINK_CB(cb->skb).pid, 4104 cb->nlh->nlmsg_seq, 4105 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4106 goto out; 4107 cont: 4108 idx++; 4109 } 4110 } 4111 out: 4112 rcu_read_unlock(); 4113 cb->args[1] = idx; 4114 cb->args[0] = h; 4115 4116 return skb->len; 4117 } 4118 4119 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4120 { 4121 struct sk_buff *skb; 4122 struct net *net = dev_net(idev->dev); 4123 int err = -ENOBUFS; 4124 4125 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4126 if (skb == NULL) 4127 goto errout; 4128 4129 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4130 if (err < 0) { 4131 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4132 WARN_ON(err == -EMSGSIZE); 4133 kfree_skb(skb); 4134 goto errout; 4135 } 4136 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4137 return; 4138 errout: 4139 if (err < 0) 4140 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4141 } 4142 4143 static inline size_t inet6_prefix_nlmsg_size(void) 4144 { 4145 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4146 + nla_total_size(sizeof(struct in6_addr)) 4147 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4148 } 4149 4150 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4151 struct prefix_info *pinfo, u32 pid, u32 seq, 4152 int event, unsigned int flags) 4153 { 4154 struct prefixmsg *pmsg; 4155 struct nlmsghdr *nlh; 4156 struct prefix_cacheinfo ci; 4157 4158 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4159 if (nlh == NULL) 4160 return -EMSGSIZE; 4161 4162 pmsg = nlmsg_data(nlh); 4163 pmsg->prefix_family = AF_INET6; 4164 pmsg->prefix_pad1 = 0; 4165 pmsg->prefix_pad2 = 0; 4166 pmsg->prefix_ifindex = idev->dev->ifindex; 4167 pmsg->prefix_len = pinfo->prefix_len; 4168 pmsg->prefix_type = pinfo->type; 4169 pmsg->prefix_pad3 = 0; 4170 pmsg->prefix_flags = 0; 4171 if (pinfo->onlink) 4172 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4173 if (pinfo->autoconf) 4174 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4175 4176 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4177 4178 ci.preferred_time = ntohl(pinfo->prefered); 4179 ci.valid_time = ntohl(pinfo->valid); 4180 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4181 4182 return nlmsg_end(skb, nlh); 4183 4184 nla_put_failure: 4185 nlmsg_cancel(skb, nlh); 4186 return -EMSGSIZE; 4187 } 4188 4189 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4190 struct prefix_info *pinfo) 4191 { 4192 struct sk_buff *skb; 4193 struct net *net = dev_net(idev->dev); 4194 int err = -ENOBUFS; 4195 4196 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4197 if (skb == NULL) 4198 goto errout; 4199 4200 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4201 if (err < 0) { 4202 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4203 WARN_ON(err == -EMSGSIZE); 4204 kfree_skb(skb); 4205 goto errout; 4206 } 4207 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4208 return; 4209 errout: 4210 if (err < 0) 4211 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4212 } 4213 4214 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4215 { 4216 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4217 4218 switch (event) { 4219 case RTM_NEWADDR: 4220 /* 4221 * If the address was optimistic 4222 * we inserted the route at the start of 4223 * our DAD process, so we don't need 4224 * to do it again 4225 */ 4226 if (!(ifp->rt->rt6i_node)) 4227 ip6_ins_rt(ifp->rt); 4228 if (ifp->idev->cnf.forwarding) 4229 addrconf_join_anycast(ifp); 4230 break; 4231 case RTM_DELADDR: 4232 if (ifp->idev->cnf.forwarding) 4233 addrconf_leave_anycast(ifp); 4234 addrconf_leave_solict(ifp->idev, &ifp->addr); 4235 dst_hold(&ifp->rt->dst); 4236 4237 if (ip6_del_rt(ifp->rt)) 4238 dst_free(&ifp->rt->dst); 4239 break; 4240 } 4241 } 4242 4243 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4244 { 4245 rcu_read_lock_bh(); 4246 if (likely(ifp->idev->dead == 0)) 4247 __ipv6_ifa_notify(event, ifp); 4248 rcu_read_unlock_bh(); 4249 } 4250 4251 #ifdef CONFIG_SYSCTL 4252 4253 static 4254 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4255 void __user *buffer, size_t *lenp, loff_t *ppos) 4256 { 4257 int *valp = ctl->data; 4258 int val = *valp; 4259 loff_t pos = *ppos; 4260 int ret; 4261 4262 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4263 4264 if (write) 4265 ret = addrconf_fixup_forwarding(ctl, valp, val); 4266 if (ret) 4267 *ppos = pos; 4268 return ret; 4269 } 4270 4271 static void dev_disable_change(struct inet6_dev *idev) 4272 { 4273 if (!idev || !idev->dev) 4274 return; 4275 4276 if (idev->cnf.disable_ipv6) 4277 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4278 else 4279 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4280 } 4281 4282 static void addrconf_disable_change(struct net *net, __s32 newf) 4283 { 4284 struct net_device *dev; 4285 struct inet6_dev *idev; 4286 4287 rcu_read_lock(); 4288 for_each_netdev_rcu(net, dev) { 4289 idev = __in6_dev_get(dev); 4290 if (idev) { 4291 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4292 idev->cnf.disable_ipv6 = newf; 4293 if (changed) 4294 dev_disable_change(idev); 4295 } 4296 } 4297 rcu_read_unlock(); 4298 } 4299 4300 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4301 { 4302 struct net *net; 4303 4304 net = (struct net *)table->extra2; 4305 4306 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4307 return 0; 4308 4309 if (!rtnl_trylock()) { 4310 /* Restore the original values before restarting */ 4311 *p = old; 4312 return restart_syscall(); 4313 } 4314 4315 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4316 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4317 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4318 addrconf_disable_change(net, newf); 4319 } else if ((!*p) ^ (!old)) 4320 dev_disable_change((struct inet6_dev *)table->extra1); 4321 4322 rtnl_unlock(); 4323 return 0; 4324 } 4325 4326 static 4327 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4328 void __user *buffer, size_t *lenp, loff_t *ppos) 4329 { 4330 int *valp = ctl->data; 4331 int val = *valp; 4332 loff_t pos = *ppos; 4333 int ret; 4334 4335 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4336 4337 if (write) 4338 ret = addrconf_disable_ipv6(ctl, valp, val); 4339 if (ret) 4340 *ppos = pos; 4341 return ret; 4342 } 4343 4344 static struct addrconf_sysctl_table 4345 { 4346 struct ctl_table_header *sysctl_header; 4347 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4348 char *dev_name; 4349 } addrconf_sysctl __read_mostly = { 4350 .sysctl_header = NULL, 4351 .addrconf_vars = { 4352 { 4353 .procname = "forwarding", 4354 .data = &ipv6_devconf.forwarding, 4355 .maxlen = sizeof(int), 4356 .mode = 0644, 4357 .proc_handler = addrconf_sysctl_forward, 4358 }, 4359 { 4360 .procname = "hop_limit", 4361 .data = &ipv6_devconf.hop_limit, 4362 .maxlen = sizeof(int), 4363 .mode = 0644, 4364 .proc_handler = proc_dointvec, 4365 }, 4366 { 4367 .procname = "mtu", 4368 .data = &ipv6_devconf.mtu6, 4369 .maxlen = sizeof(int), 4370 .mode = 0644, 4371 .proc_handler = proc_dointvec, 4372 }, 4373 { 4374 .procname = "accept_ra", 4375 .data = &ipv6_devconf.accept_ra, 4376 .maxlen = sizeof(int), 4377 .mode = 0644, 4378 .proc_handler = proc_dointvec, 4379 }, 4380 { 4381 .procname = "accept_redirects", 4382 .data = &ipv6_devconf.accept_redirects, 4383 .maxlen = sizeof(int), 4384 .mode = 0644, 4385 .proc_handler = proc_dointvec, 4386 }, 4387 { 4388 .procname = "autoconf", 4389 .data = &ipv6_devconf.autoconf, 4390 .maxlen = sizeof(int), 4391 .mode = 0644, 4392 .proc_handler = proc_dointvec, 4393 }, 4394 { 4395 .procname = "dad_transmits", 4396 .data = &ipv6_devconf.dad_transmits, 4397 .maxlen = sizeof(int), 4398 .mode = 0644, 4399 .proc_handler = proc_dointvec, 4400 }, 4401 { 4402 .procname = "router_solicitations", 4403 .data = &ipv6_devconf.rtr_solicits, 4404 .maxlen = sizeof(int), 4405 .mode = 0644, 4406 .proc_handler = proc_dointvec, 4407 }, 4408 { 4409 .procname = "router_solicitation_interval", 4410 .data = &ipv6_devconf.rtr_solicit_interval, 4411 .maxlen = sizeof(int), 4412 .mode = 0644, 4413 .proc_handler = proc_dointvec_jiffies, 4414 }, 4415 { 4416 .procname = "router_solicitation_delay", 4417 .data = &ipv6_devconf.rtr_solicit_delay, 4418 .maxlen = sizeof(int), 4419 .mode = 0644, 4420 .proc_handler = proc_dointvec_jiffies, 4421 }, 4422 { 4423 .procname = "force_mld_version", 4424 .data = &ipv6_devconf.force_mld_version, 4425 .maxlen = sizeof(int), 4426 .mode = 0644, 4427 .proc_handler = proc_dointvec, 4428 }, 4429 #ifdef CONFIG_IPV6_PRIVACY 4430 { 4431 .procname = "use_tempaddr", 4432 .data = &ipv6_devconf.use_tempaddr, 4433 .maxlen = sizeof(int), 4434 .mode = 0644, 4435 .proc_handler = proc_dointvec, 4436 }, 4437 { 4438 .procname = "temp_valid_lft", 4439 .data = &ipv6_devconf.temp_valid_lft, 4440 .maxlen = sizeof(int), 4441 .mode = 0644, 4442 .proc_handler = proc_dointvec, 4443 }, 4444 { 4445 .procname = "temp_prefered_lft", 4446 .data = &ipv6_devconf.temp_prefered_lft, 4447 .maxlen = sizeof(int), 4448 .mode = 0644, 4449 .proc_handler = proc_dointvec, 4450 }, 4451 { 4452 .procname = "regen_max_retry", 4453 .data = &ipv6_devconf.regen_max_retry, 4454 .maxlen = sizeof(int), 4455 .mode = 0644, 4456 .proc_handler = proc_dointvec, 4457 }, 4458 { 4459 .procname = "max_desync_factor", 4460 .data = &ipv6_devconf.max_desync_factor, 4461 .maxlen = sizeof(int), 4462 .mode = 0644, 4463 .proc_handler = proc_dointvec, 4464 }, 4465 #endif 4466 { 4467 .procname = "max_addresses", 4468 .data = &ipv6_devconf.max_addresses, 4469 .maxlen = sizeof(int), 4470 .mode = 0644, 4471 .proc_handler = proc_dointvec, 4472 }, 4473 { 4474 .procname = "accept_ra_defrtr", 4475 .data = &ipv6_devconf.accept_ra_defrtr, 4476 .maxlen = sizeof(int), 4477 .mode = 0644, 4478 .proc_handler = proc_dointvec, 4479 }, 4480 { 4481 .procname = "accept_ra_pinfo", 4482 .data = &ipv6_devconf.accept_ra_pinfo, 4483 .maxlen = sizeof(int), 4484 .mode = 0644, 4485 .proc_handler = proc_dointvec, 4486 }, 4487 #ifdef CONFIG_IPV6_ROUTER_PREF 4488 { 4489 .procname = "accept_ra_rtr_pref", 4490 .data = &ipv6_devconf.accept_ra_rtr_pref, 4491 .maxlen = sizeof(int), 4492 .mode = 0644, 4493 .proc_handler = proc_dointvec, 4494 }, 4495 { 4496 .procname = "router_probe_interval", 4497 .data = &ipv6_devconf.rtr_probe_interval, 4498 .maxlen = sizeof(int), 4499 .mode = 0644, 4500 .proc_handler = proc_dointvec_jiffies, 4501 }, 4502 #ifdef CONFIG_IPV6_ROUTE_INFO 4503 { 4504 .procname = "accept_ra_rt_info_max_plen", 4505 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4506 .maxlen = sizeof(int), 4507 .mode = 0644, 4508 .proc_handler = proc_dointvec, 4509 }, 4510 #endif 4511 #endif 4512 { 4513 .procname = "proxy_ndp", 4514 .data = &ipv6_devconf.proxy_ndp, 4515 .maxlen = sizeof(int), 4516 .mode = 0644, 4517 .proc_handler = proc_dointvec, 4518 }, 4519 { 4520 .procname = "accept_source_route", 4521 .data = &ipv6_devconf.accept_source_route, 4522 .maxlen = sizeof(int), 4523 .mode = 0644, 4524 .proc_handler = proc_dointvec, 4525 }, 4526 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4527 { 4528 .procname = "optimistic_dad", 4529 .data = &ipv6_devconf.optimistic_dad, 4530 .maxlen = sizeof(int), 4531 .mode = 0644, 4532 .proc_handler = proc_dointvec, 4533 4534 }, 4535 #endif 4536 #ifdef CONFIG_IPV6_MROUTE 4537 { 4538 .procname = "mc_forwarding", 4539 .data = &ipv6_devconf.mc_forwarding, 4540 .maxlen = sizeof(int), 4541 .mode = 0444, 4542 .proc_handler = proc_dointvec, 4543 }, 4544 #endif 4545 { 4546 .procname = "disable_ipv6", 4547 .data = &ipv6_devconf.disable_ipv6, 4548 .maxlen = sizeof(int), 4549 .mode = 0644, 4550 .proc_handler = addrconf_sysctl_disable, 4551 }, 4552 { 4553 .procname = "accept_dad", 4554 .data = &ipv6_devconf.accept_dad, 4555 .maxlen = sizeof(int), 4556 .mode = 0644, 4557 .proc_handler = proc_dointvec, 4558 }, 4559 { 4560 .procname = "force_tllao", 4561 .data = &ipv6_devconf.force_tllao, 4562 .maxlen = sizeof(int), 4563 .mode = 0644, 4564 .proc_handler = proc_dointvec 4565 }, 4566 { 4567 /* sentinel */ 4568 } 4569 }, 4570 }; 4571 4572 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4573 struct inet6_dev *idev, struct ipv6_devconf *p) 4574 { 4575 int i; 4576 struct addrconf_sysctl_table *t; 4577 4578 #define ADDRCONF_CTL_PATH_DEV 3 4579 4580 struct ctl_path addrconf_ctl_path[] = { 4581 { .procname = "net", }, 4582 { .procname = "ipv6", }, 4583 { .procname = "conf", }, 4584 { /* to be set */ }, 4585 { }, 4586 }; 4587 4588 4589 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4590 if (t == NULL) 4591 goto out; 4592 4593 for (i = 0; t->addrconf_vars[i].data; i++) { 4594 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4595 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4596 t->addrconf_vars[i].extra2 = net; 4597 } 4598 4599 /* 4600 * Make a copy of dev_name, because '.procname' is regarded as const 4601 * by sysctl and we wouldn't want anyone to change it under our feet 4602 * (see SIOCSIFNAME). 4603 */ 4604 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4605 if (!t->dev_name) 4606 goto free; 4607 4608 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4609 4610 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4611 t->addrconf_vars); 4612 if (t->sysctl_header == NULL) 4613 goto free_procname; 4614 4615 p->sysctl = t; 4616 return 0; 4617 4618 free_procname: 4619 kfree(t->dev_name); 4620 free: 4621 kfree(t); 4622 out: 4623 return -ENOBUFS; 4624 } 4625 4626 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4627 { 4628 struct addrconf_sysctl_table *t; 4629 4630 if (p->sysctl == NULL) 4631 return; 4632 4633 t = p->sysctl; 4634 p->sysctl = NULL; 4635 unregister_net_sysctl_table(t->sysctl_header); 4636 kfree(t->dev_name); 4637 kfree(t); 4638 } 4639 4640 static void addrconf_sysctl_register(struct inet6_dev *idev) 4641 { 4642 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4643 &ndisc_ifinfo_sysctl_change); 4644 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4645 idev, &idev->cnf); 4646 } 4647 4648 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4649 { 4650 __addrconf_sysctl_unregister(&idev->cnf); 4651 neigh_sysctl_unregister(idev->nd_parms); 4652 } 4653 4654 4655 #endif 4656 4657 static int __net_init addrconf_init_net(struct net *net) 4658 { 4659 int err; 4660 struct ipv6_devconf *all, *dflt; 4661 4662 err = -ENOMEM; 4663 all = &ipv6_devconf; 4664 dflt = &ipv6_devconf_dflt; 4665 4666 if (!net_eq(net, &init_net)) { 4667 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4668 if (all == NULL) 4669 goto err_alloc_all; 4670 4671 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4672 if (dflt == NULL) 4673 goto err_alloc_dflt; 4674 } else { 4675 /* these will be inherited by all namespaces */ 4676 dflt->autoconf = ipv6_defaults.autoconf; 4677 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4678 } 4679 4680 net->ipv6.devconf_all = all; 4681 net->ipv6.devconf_dflt = dflt; 4682 4683 #ifdef CONFIG_SYSCTL 4684 err = __addrconf_sysctl_register(net, "all", NULL, all); 4685 if (err < 0) 4686 goto err_reg_all; 4687 4688 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4689 if (err < 0) 4690 goto err_reg_dflt; 4691 #endif 4692 return 0; 4693 4694 #ifdef CONFIG_SYSCTL 4695 err_reg_dflt: 4696 __addrconf_sysctl_unregister(all); 4697 err_reg_all: 4698 kfree(dflt); 4699 #endif 4700 err_alloc_dflt: 4701 kfree(all); 4702 err_alloc_all: 4703 return err; 4704 } 4705 4706 static void __net_exit addrconf_exit_net(struct net *net) 4707 { 4708 #ifdef CONFIG_SYSCTL 4709 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4710 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4711 #endif 4712 if (!net_eq(net, &init_net)) { 4713 kfree(net->ipv6.devconf_dflt); 4714 kfree(net->ipv6.devconf_all); 4715 } 4716 } 4717 4718 static struct pernet_operations addrconf_ops = { 4719 .init = addrconf_init_net, 4720 .exit = addrconf_exit_net, 4721 }; 4722 4723 /* 4724 * Device notifier 4725 */ 4726 4727 int register_inet6addr_notifier(struct notifier_block *nb) 4728 { 4729 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4730 } 4731 EXPORT_SYMBOL(register_inet6addr_notifier); 4732 4733 int unregister_inet6addr_notifier(struct notifier_block *nb) 4734 { 4735 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4736 } 4737 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4738 4739 static struct rtnl_af_ops inet6_ops = { 4740 .family = AF_INET6, 4741 .fill_link_af = inet6_fill_link_af, 4742 .get_link_af_size = inet6_get_link_af_size, 4743 }; 4744 4745 /* 4746 * Init / cleanup code 4747 */ 4748 4749 int __init addrconf_init(void) 4750 { 4751 int i, err; 4752 4753 err = ipv6_addr_label_init(); 4754 if (err < 0) { 4755 printk(KERN_CRIT "IPv6 Addrconf:" 4756 " cannot initialize default policy table: %d.\n", err); 4757 goto out; 4758 } 4759 4760 err = register_pernet_subsys(&addrconf_ops); 4761 if (err < 0) 4762 goto out_addrlabel; 4763 4764 /* The addrconf netdev notifier requires that loopback_dev 4765 * has it's ipv6 private information allocated and setup 4766 * before it can bring up and give link-local addresses 4767 * to other devices which are up. 4768 * 4769 * Unfortunately, loopback_dev is not necessarily the first 4770 * entry in the global dev_base list of net devices. In fact, 4771 * it is likely to be the very last entry on that list. 4772 * So this causes the notifier registry below to try and 4773 * give link-local addresses to all devices besides loopback_dev 4774 * first, then loopback_dev, which cases all the non-loopback_dev 4775 * devices to fail to get a link-local address. 4776 * 4777 * So, as a temporary fix, allocate the ipv6 structure for 4778 * loopback_dev first by hand. 4779 * Longer term, all of the dependencies ipv6 has upon the loopback 4780 * device and it being up should be removed. 4781 */ 4782 rtnl_lock(); 4783 if (!ipv6_add_dev(init_net.loopback_dev)) 4784 err = -ENOMEM; 4785 rtnl_unlock(); 4786 if (err) 4787 goto errlo; 4788 4789 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4790 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4791 4792 register_netdevice_notifier(&ipv6_dev_notf); 4793 4794 addrconf_verify(0); 4795 4796 err = rtnl_af_register(&inet6_ops); 4797 if (err < 0) 4798 goto errout_af; 4799 4800 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4801 NULL); 4802 if (err < 0) 4803 goto errout; 4804 4805 /* Only the first call to __rtnl_register can fail */ 4806 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4807 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4808 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4809 inet6_dump_ifaddr, NULL); 4810 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4811 inet6_dump_ifmcaddr, NULL); 4812 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4813 inet6_dump_ifacaddr, NULL); 4814 4815 ipv6_addr_label_rtnl_register(); 4816 4817 return 0; 4818 errout: 4819 rtnl_af_unregister(&inet6_ops); 4820 errout_af: 4821 unregister_netdevice_notifier(&ipv6_dev_notf); 4822 errlo: 4823 unregister_pernet_subsys(&addrconf_ops); 4824 out_addrlabel: 4825 ipv6_addr_label_cleanup(); 4826 out: 4827 return err; 4828 } 4829 4830 void addrconf_cleanup(void) 4831 { 4832 struct net_device *dev; 4833 int i; 4834 4835 unregister_netdevice_notifier(&ipv6_dev_notf); 4836 unregister_pernet_subsys(&addrconf_ops); 4837 ipv6_addr_label_cleanup(); 4838 4839 rtnl_lock(); 4840 4841 __rtnl_af_unregister(&inet6_ops); 4842 4843 /* clean dev list */ 4844 for_each_netdev(&init_net, dev) { 4845 if (__in6_dev_get(dev) == NULL) 4846 continue; 4847 addrconf_ifdown(dev, 1); 4848 } 4849 addrconf_ifdown(init_net.loopback_dev, 2); 4850 4851 /* 4852 * Check hash table. 4853 */ 4854 spin_lock_bh(&addrconf_hash_lock); 4855 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4856 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4857 spin_unlock_bh(&addrconf_hash_lock); 4858 4859 del_timer(&addr_chk_timer); 4860 rtnl_unlock(); 4861 } 4862