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 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 /* 18 * Changes: 19 * 20 * Janos Farkas : delete timer on ifdown 21 * <chexum@bankinf.banki.hu> 22 * Andi Kleen : kill double kfree on module 23 * unload. 24 * Maciej W. Rozycki : FDDI support 25 * sekiya@USAGI : Don't send too many RS 26 * packets. 27 * yoshfuji@USAGI : Fixed interval between DAD 28 * packets. 29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 30 * address validation timer. 31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 32 * support. 33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 34 * address on a same interface. 35 * YOSHIFUJI Hideaki @USAGI : ARCnet support 36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 37 * seq_file. 38 * YOSHIFUJI Hideaki @USAGI : improved source address 39 * selection; consider scope, 40 * status etc. 41 */ 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/socket.h> 46 #include <linux/sockios.h> 47 #include <linux/net.h> 48 #include <linux/in6.h> 49 #include <linux/netdevice.h> 50 #include <linux/if_addr.h> 51 #include <linux/if_arp.h> 52 #include <linux/if_arcnet.h> 53 #include <linux/if_infiniband.h> 54 #include <linux/route.h> 55 #include <linux/inetdevice.h> 56 #include <linux/init.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 <asm/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 91 /* Set to 3 to get tracing... */ 92 #define ACONF_DEBUG 2 93 94 #if ACONF_DEBUG >= 3 95 #define ADBG(x) printk x 96 #else 97 #define ADBG(x) 98 #endif 99 100 #define INFINITY_LIFE_TIME 0xFFFFFFFF 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 102 103 #ifdef CONFIG_SYSCTL 104 static void addrconf_sysctl_register(struct inet6_dev *idev); 105 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 106 #else 107 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 108 { 109 } 110 111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 112 { 113 } 114 #endif 115 116 #ifdef CONFIG_IPV6_PRIVACY 117 static int __ipv6_regen_rndid(struct inet6_dev *idev); 118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 119 static void ipv6_regen_rndid(unsigned long data); 120 121 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 122 #endif 123 124 static int ipv6_count_addresses(struct inet6_dev *idev); 125 126 /* 127 * Configured unicast address hash table 128 */ 129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 130 static DEFINE_RWLOCK(addrconf_hash_lock); 131 132 static void addrconf_verify(unsigned long); 133 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 135 static DEFINE_SPINLOCK(addrconf_verify_lock); 136 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 139 140 static int addrconf_ifdown(struct net_device *dev, int how); 141 142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 143 static void addrconf_dad_timer(unsigned long data); 144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 145 static void addrconf_dad_run(struct inet6_dev *idev); 146 static void addrconf_rs_timer(unsigned long data); 147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 149 150 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 151 struct prefix_info *pinfo); 152 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); 153 154 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 155 156 struct ipv6_devconf ipv6_devconf __read_mostly = { 157 .forwarding = 0, 158 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 159 .mtu6 = IPV6_MIN_MTU, 160 .accept_ra = 1, 161 .accept_redirects = 1, 162 .autoconf = 1, 163 .force_mld_version = 0, 164 .dad_transmits = 1, 165 .rtr_solicits = MAX_RTR_SOLICITATIONS, 166 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 167 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 168 #ifdef CONFIG_IPV6_PRIVACY 169 .use_tempaddr = 0, 170 .temp_valid_lft = TEMP_VALID_LIFETIME, 171 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 172 .regen_max_retry = REGEN_MAX_RETRY, 173 .max_desync_factor = MAX_DESYNC_FACTOR, 174 #endif 175 .max_addresses = IPV6_MAX_ADDRESSES, 176 .accept_ra_defrtr = 1, 177 .accept_ra_pinfo = 1, 178 #ifdef CONFIG_IPV6_ROUTER_PREF 179 .accept_ra_rtr_pref = 1, 180 .rtr_probe_interval = 60 * HZ, 181 #ifdef CONFIG_IPV6_ROUTE_INFO 182 .accept_ra_rt_info_max_plen = 0, 183 #endif 184 #endif 185 .proxy_ndp = 0, 186 .accept_source_route = 0, /* we do not accept RH0 by default. */ 187 }; 188 189 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 190 .forwarding = 0, 191 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 192 .mtu6 = IPV6_MIN_MTU, 193 .accept_ra = 1, 194 .accept_redirects = 1, 195 .autoconf = 1, 196 .dad_transmits = 1, 197 .rtr_solicits = MAX_RTR_SOLICITATIONS, 198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 199 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 200 #ifdef CONFIG_IPV6_PRIVACY 201 .use_tempaddr = 0, 202 .temp_valid_lft = TEMP_VALID_LIFETIME, 203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 204 .regen_max_retry = REGEN_MAX_RETRY, 205 .max_desync_factor = MAX_DESYNC_FACTOR, 206 #endif 207 .max_addresses = IPV6_MAX_ADDRESSES, 208 .accept_ra_defrtr = 1, 209 .accept_ra_pinfo = 1, 210 #ifdef CONFIG_IPV6_ROUTER_PREF 211 .accept_ra_rtr_pref = 1, 212 .rtr_probe_interval = 60 * HZ, 213 #ifdef CONFIG_IPV6_ROUTE_INFO 214 .accept_ra_rt_info_max_plen = 0, 215 #endif 216 #endif 217 .proxy_ndp = 0, 218 .accept_source_route = 0, /* we do not accept RH0 by default. */ 219 }; 220 221 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 222 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 223 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 224 225 /* Check if a valid qdisc is available */ 226 static inline int addrconf_qdisc_ok(struct net_device *dev) 227 { 228 return (dev->qdisc != &noop_qdisc); 229 } 230 231 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 232 { 233 if (del_timer(&ifp->timer)) 234 __in6_ifa_put(ifp); 235 } 236 237 enum addrconf_timer_t 238 { 239 AC_NONE, 240 AC_DAD, 241 AC_RS, 242 }; 243 244 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 245 enum addrconf_timer_t what, 246 unsigned long when) 247 { 248 if (!del_timer(&ifp->timer)) 249 in6_ifa_hold(ifp); 250 251 switch (what) { 252 case AC_DAD: 253 ifp->timer.function = addrconf_dad_timer; 254 break; 255 case AC_RS: 256 ifp->timer.function = addrconf_rs_timer; 257 break; 258 default:; 259 } 260 ifp->timer.expires = jiffies + when; 261 add_timer(&ifp->timer); 262 } 263 264 static int snmp6_alloc_dev(struct inet6_dev *idev) 265 { 266 if (snmp_mib_init((void **)idev->stats.ipv6, 267 sizeof(struct ipstats_mib)) < 0) 268 goto err_ip; 269 if (snmp_mib_init((void **)idev->stats.icmpv6, 270 sizeof(struct icmpv6_mib)) < 0) 271 goto err_icmp; 272 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 273 sizeof(struct icmpv6msg_mib)) < 0) 274 goto err_icmpmsg; 275 276 return 0; 277 278 err_icmpmsg: 279 snmp_mib_free((void **)idev->stats.icmpv6); 280 err_icmp: 281 snmp_mib_free((void **)idev->stats.ipv6); 282 err_ip: 283 return -ENOMEM; 284 } 285 286 static void snmp6_free_dev(struct inet6_dev *idev) 287 { 288 snmp_mib_free((void **)idev->stats.icmpv6msg); 289 snmp_mib_free((void **)idev->stats.icmpv6); 290 snmp_mib_free((void **)idev->stats.ipv6); 291 } 292 293 /* Nobody refers to this device, we may destroy it. */ 294 295 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 296 { 297 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 298 kfree(idev); 299 } 300 301 void in6_dev_finish_destroy(struct inet6_dev *idev) 302 { 303 struct net_device *dev = idev->dev; 304 BUG_TRAP(idev->addr_list==NULL); 305 BUG_TRAP(idev->mc_list==NULL); 306 #ifdef NET_REFCNT_DEBUG 307 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 308 #endif 309 dev_put(dev); 310 if (!idev->dead) { 311 printk("Freeing alive inet6 device %p\n", idev); 312 return; 313 } 314 snmp6_free_dev(idev); 315 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 316 } 317 318 EXPORT_SYMBOL(in6_dev_finish_destroy); 319 320 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 321 { 322 struct inet6_dev *ndev; 323 struct in6_addr maddr; 324 325 ASSERT_RTNL(); 326 327 if (dev->mtu < IPV6_MIN_MTU) 328 return NULL; 329 330 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 331 332 if (ndev == NULL) 333 return NULL; 334 335 rwlock_init(&ndev->lock); 336 ndev->dev = dev; 337 memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf)); 338 ndev->cnf.mtu6 = dev->mtu; 339 ndev->cnf.sysctl = NULL; 340 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 341 if (ndev->nd_parms == NULL) { 342 kfree(ndev); 343 return NULL; 344 } 345 /* We refer to the device */ 346 dev_hold(dev); 347 348 if (snmp6_alloc_dev(ndev) < 0) { 349 ADBG((KERN_WARNING 350 "%s(): cannot allocate memory for statistics; dev=%s.\n", 351 __FUNCTION__, dev->name)); 352 neigh_parms_release(&nd_tbl, ndev->nd_parms); 353 ndev->dead = 1; 354 in6_dev_finish_destroy(ndev); 355 return NULL; 356 } 357 358 if (snmp6_register_dev(ndev) < 0) { 359 ADBG((KERN_WARNING 360 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 361 __FUNCTION__, dev->name)); 362 neigh_parms_release(&nd_tbl, ndev->nd_parms); 363 ndev->dead = 1; 364 in6_dev_finish_destroy(ndev); 365 return NULL; 366 } 367 368 /* One reference from device. We must do this before 369 * we invoke __ipv6_regen_rndid(). 370 */ 371 in6_dev_hold(ndev); 372 373 #ifdef CONFIG_IPV6_PRIVACY 374 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 375 if ((dev->flags&IFF_LOOPBACK) || 376 dev->type == ARPHRD_TUNNEL || 377 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 378 dev->type == ARPHRD_SIT || 379 #endif 380 dev->type == ARPHRD_NONE) { 381 printk(KERN_INFO 382 "%s: Disabled Privacy Extensions\n", 383 dev->name); 384 ndev->cnf.use_tempaddr = -1; 385 386 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 387 printk(KERN_INFO 388 "%s: Disabled Multicast RS\n", 389 dev->name); 390 ndev->cnf.rtr_solicits = 0; 391 } 392 } else { 393 in6_dev_hold(ndev); 394 ipv6_regen_rndid((unsigned long) ndev); 395 } 396 #endif 397 398 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 399 ndev->if_flags |= IF_READY; 400 401 ipv6_mc_init_dev(ndev); 402 ndev->tstamp = jiffies; 403 addrconf_sysctl_register(ndev); 404 /* protected by rtnl_lock */ 405 rcu_assign_pointer(dev->ip6_ptr, ndev); 406 407 /* Join all-node multicast group */ 408 ipv6_addr_all_nodes(&maddr); 409 ipv6_dev_mc_inc(dev, &maddr); 410 411 return ndev; 412 } 413 414 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 415 { 416 struct inet6_dev *idev; 417 418 ASSERT_RTNL(); 419 420 if ((idev = __in6_dev_get(dev)) == NULL) { 421 if ((idev = ipv6_add_dev(dev)) == NULL) 422 return NULL; 423 } 424 425 if (dev->flags&IFF_UP) 426 ipv6_mc_up(idev); 427 return idev; 428 } 429 430 #ifdef CONFIG_SYSCTL 431 static void dev_forward_change(struct inet6_dev *idev) 432 { 433 struct net_device *dev; 434 struct inet6_ifaddr *ifa; 435 struct in6_addr addr; 436 437 if (!idev) 438 return; 439 dev = idev->dev; 440 if (dev && (dev->flags & IFF_MULTICAST)) { 441 ipv6_addr_all_routers(&addr); 442 443 if (idev->cnf.forwarding) 444 ipv6_dev_mc_inc(dev, &addr); 445 else 446 ipv6_dev_mc_dec(dev, &addr); 447 } 448 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 449 if (ifa->flags&IFA_F_TENTATIVE) 450 continue; 451 if (idev->cnf.forwarding) 452 addrconf_join_anycast(ifa); 453 else 454 addrconf_leave_anycast(ifa); 455 } 456 } 457 458 459 static void addrconf_forward_change(struct net *net) 460 { 461 struct net_device *dev; 462 struct inet6_dev *idev; 463 464 read_lock(&dev_base_lock); 465 for_each_netdev(net, dev) { 466 rcu_read_lock(); 467 idev = __in6_dev_get(dev); 468 if (idev) { 469 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); 470 idev->cnf.forwarding = ipv6_devconf.forwarding; 471 if (changed) 472 dev_forward_change(idev); 473 } 474 rcu_read_unlock(); 475 } 476 read_unlock(&dev_base_lock); 477 } 478 479 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 480 { 481 struct net *net; 482 483 net = (struct net *)table->extra2; 484 if (p == &net->ipv6.devconf_dflt->forwarding) 485 return; 486 487 if (p == &ipv6_devconf.forwarding) { 488 net->ipv6.devconf_dflt->forwarding = ipv6_devconf.forwarding; 489 addrconf_forward_change(net); 490 } else if ((!*p) ^ (!old)) 491 dev_forward_change((struct inet6_dev *)table->extra1); 492 493 if (*p) 494 rt6_purge_dflt_routers(); 495 } 496 #endif 497 498 /* Nobody refers to this ifaddr, destroy it */ 499 500 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 501 { 502 BUG_TRAP(ifp->if_next==NULL); 503 BUG_TRAP(ifp->lst_next==NULL); 504 #ifdef NET_REFCNT_DEBUG 505 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 506 #endif 507 508 in6_dev_put(ifp->idev); 509 510 if (del_timer(&ifp->timer)) 511 printk("Timer is still running, when freeing ifa=%p\n", ifp); 512 513 if (!ifp->dead) { 514 printk("Freeing alive inet6 address %p\n", ifp); 515 return; 516 } 517 dst_release(&ifp->rt->u.dst); 518 519 kfree(ifp); 520 } 521 522 static void 523 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 524 { 525 struct inet6_ifaddr *ifa, **ifap; 526 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 527 528 /* 529 * Each device address list is sorted in order of scope - 530 * global before linklocal. 531 */ 532 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 533 ifap = &ifa->if_next) { 534 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 535 break; 536 } 537 538 ifp->if_next = *ifap; 539 *ifap = ifp; 540 } 541 542 /* On success it returns ifp with increased reference count */ 543 544 static struct inet6_ifaddr * 545 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 546 int scope, u32 flags) 547 { 548 struct inet6_ifaddr *ifa = NULL; 549 struct rt6_info *rt; 550 int hash; 551 int err = 0; 552 553 rcu_read_lock_bh(); 554 if (idev->dead) { 555 err = -ENODEV; /*XXX*/ 556 goto out2; 557 } 558 559 write_lock(&addrconf_hash_lock); 560 561 /* Ignore adding duplicate addresses on an interface */ 562 if (ipv6_chk_same_addr(addr, idev->dev)) { 563 ADBG(("ipv6_add_addr: already assigned\n")); 564 err = -EEXIST; 565 goto out; 566 } 567 568 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 569 570 if (ifa == NULL) { 571 ADBG(("ipv6_add_addr: malloc failed\n")); 572 err = -ENOBUFS; 573 goto out; 574 } 575 576 rt = addrconf_dst_alloc(idev, addr, 0); 577 if (IS_ERR(rt)) { 578 err = PTR_ERR(rt); 579 goto out; 580 } 581 582 ipv6_addr_copy(&ifa->addr, addr); 583 584 spin_lock_init(&ifa->lock); 585 init_timer(&ifa->timer); 586 ifa->timer.data = (unsigned long) ifa; 587 ifa->scope = scope; 588 ifa->prefix_len = pfxlen; 589 ifa->flags = flags | IFA_F_TENTATIVE; 590 ifa->cstamp = ifa->tstamp = jiffies; 591 592 ifa->rt = rt; 593 594 /* 595 * part one of RFC 4429, section 3.3 596 * We should not configure an address as 597 * optimistic if we do not yet know the link 598 * layer address of our nexhop router 599 */ 600 601 if (rt->rt6i_nexthop == NULL) 602 ifa->flags &= ~IFA_F_OPTIMISTIC; 603 604 ifa->idev = idev; 605 in6_dev_hold(idev); 606 /* For caller */ 607 in6_ifa_hold(ifa); 608 609 /* Add to big hash table */ 610 hash = ipv6_addr_hash(addr); 611 612 ifa->lst_next = inet6_addr_lst[hash]; 613 inet6_addr_lst[hash] = ifa; 614 in6_ifa_hold(ifa); 615 write_unlock(&addrconf_hash_lock); 616 617 write_lock(&idev->lock); 618 /* Add to inet6_dev unicast addr list. */ 619 ipv6_link_dev_addr(idev, ifa); 620 621 #ifdef CONFIG_IPV6_PRIVACY 622 if (ifa->flags&IFA_F_TEMPORARY) { 623 ifa->tmp_next = idev->tempaddr_list; 624 idev->tempaddr_list = ifa; 625 in6_ifa_hold(ifa); 626 } 627 #endif 628 629 in6_ifa_hold(ifa); 630 write_unlock(&idev->lock); 631 out2: 632 rcu_read_unlock_bh(); 633 634 if (likely(err == 0)) 635 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 636 else { 637 kfree(ifa); 638 ifa = ERR_PTR(err); 639 } 640 641 return ifa; 642 out: 643 write_unlock(&addrconf_hash_lock); 644 goto out2; 645 } 646 647 /* This function wants to get referenced ifp and releases it before return */ 648 649 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 650 { 651 struct inet6_ifaddr *ifa, **ifap; 652 struct inet6_dev *idev = ifp->idev; 653 int hash; 654 int deleted = 0, onlink = 0; 655 unsigned long expires = jiffies; 656 657 hash = ipv6_addr_hash(&ifp->addr); 658 659 ifp->dead = 1; 660 661 write_lock_bh(&addrconf_hash_lock); 662 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 663 ifap = &ifa->lst_next) { 664 if (ifa == ifp) { 665 *ifap = ifa->lst_next; 666 __in6_ifa_put(ifp); 667 ifa->lst_next = NULL; 668 break; 669 } 670 } 671 write_unlock_bh(&addrconf_hash_lock); 672 673 write_lock_bh(&idev->lock); 674 #ifdef CONFIG_IPV6_PRIVACY 675 if (ifp->flags&IFA_F_TEMPORARY) { 676 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 677 ifap = &ifa->tmp_next) { 678 if (ifa == ifp) { 679 *ifap = ifa->tmp_next; 680 if (ifp->ifpub) { 681 in6_ifa_put(ifp->ifpub); 682 ifp->ifpub = NULL; 683 } 684 __in6_ifa_put(ifp); 685 ifa->tmp_next = NULL; 686 break; 687 } 688 } 689 } 690 #endif 691 692 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 693 if (ifa == ifp) { 694 *ifap = ifa->if_next; 695 __in6_ifa_put(ifp); 696 ifa->if_next = NULL; 697 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 698 break; 699 deleted = 1; 700 continue; 701 } else if (ifp->flags & IFA_F_PERMANENT) { 702 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 703 ifp->prefix_len)) { 704 if (ifa->flags & IFA_F_PERMANENT) { 705 onlink = 1; 706 if (deleted) 707 break; 708 } else { 709 unsigned long lifetime; 710 711 if (!onlink) 712 onlink = -1; 713 714 spin_lock(&ifa->lock); 715 lifetime = min_t(unsigned long, 716 ifa->valid_lft, 0x7fffffffUL/HZ); 717 if (time_before(expires, 718 ifa->tstamp + lifetime * HZ)) 719 expires = ifa->tstamp + lifetime * HZ; 720 spin_unlock(&ifa->lock); 721 } 722 } 723 } 724 ifap = &ifa->if_next; 725 } 726 write_unlock_bh(&idev->lock); 727 728 ipv6_ifa_notify(RTM_DELADDR, ifp); 729 730 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 731 732 addrconf_del_timer(ifp); 733 734 /* 735 * Purge or update corresponding prefix 736 * 737 * 1) we don't purge prefix here if address was not permanent. 738 * prefix is managed by its own lifetime. 739 * 2) if there're no addresses, delete prefix. 740 * 3) if there're still other permanent address(es), 741 * corresponding prefix is still permanent. 742 * 4) otherwise, update prefix lifetime to the 743 * longest valid lifetime among the corresponding 744 * addresses on the device. 745 * Note: subsequent RA will update lifetime. 746 * 747 * --yoshfuji 748 */ 749 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 750 struct in6_addr prefix; 751 struct rt6_info *rt; 752 753 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 754 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 755 756 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 757 if (onlink == 0) { 758 ip6_del_rt(rt); 759 rt = NULL; 760 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 761 rt->rt6i_expires = expires; 762 rt->rt6i_flags |= RTF_EXPIRES; 763 } 764 } 765 dst_release(&rt->u.dst); 766 } 767 768 in6_ifa_put(ifp); 769 } 770 771 #ifdef CONFIG_IPV6_PRIVACY 772 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 773 { 774 struct inet6_dev *idev = ifp->idev; 775 struct in6_addr addr, *tmpaddr; 776 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 777 int tmp_plen; 778 int ret = 0; 779 int max_addresses; 780 u32 addr_flags; 781 782 write_lock(&idev->lock); 783 if (ift) { 784 spin_lock_bh(&ift->lock); 785 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 786 spin_unlock_bh(&ift->lock); 787 tmpaddr = &addr; 788 } else { 789 tmpaddr = NULL; 790 } 791 retry: 792 in6_dev_hold(idev); 793 if (idev->cnf.use_tempaddr <= 0) { 794 write_unlock(&idev->lock); 795 printk(KERN_INFO 796 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 797 in6_dev_put(idev); 798 ret = -1; 799 goto out; 800 } 801 spin_lock_bh(&ifp->lock); 802 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 803 idev->cnf.use_tempaddr = -1; /*XXX*/ 804 spin_unlock_bh(&ifp->lock); 805 write_unlock(&idev->lock); 806 printk(KERN_WARNING 807 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 808 in6_dev_put(idev); 809 ret = -1; 810 goto out; 811 } 812 in6_ifa_hold(ifp); 813 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 814 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 815 spin_unlock_bh(&ifp->lock); 816 write_unlock(&idev->lock); 817 printk(KERN_WARNING 818 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 819 in6_ifa_put(ifp); 820 in6_dev_put(idev); 821 ret = -1; 822 goto out; 823 } 824 memcpy(&addr.s6_addr[8], idev->rndid, 8); 825 tmp_valid_lft = min_t(__u32, 826 ifp->valid_lft, 827 idev->cnf.temp_valid_lft); 828 tmp_prefered_lft = min_t(__u32, 829 ifp->prefered_lft, 830 idev->cnf.temp_prefered_lft - desync_factor / HZ); 831 tmp_plen = ifp->prefix_len; 832 max_addresses = idev->cnf.max_addresses; 833 tmp_cstamp = ifp->cstamp; 834 tmp_tstamp = ifp->tstamp; 835 spin_unlock_bh(&ifp->lock); 836 837 write_unlock(&idev->lock); 838 839 addr_flags = IFA_F_TEMPORARY; 840 /* set in addrconf_prefix_rcv() */ 841 if (ifp->flags & IFA_F_OPTIMISTIC) 842 addr_flags |= IFA_F_OPTIMISTIC; 843 844 ift = !max_addresses || 845 ipv6_count_addresses(idev) < max_addresses ? 846 ipv6_add_addr(idev, &addr, tmp_plen, 847 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 848 addr_flags) : NULL; 849 if (!ift || IS_ERR(ift)) { 850 in6_ifa_put(ifp); 851 in6_dev_put(idev); 852 printk(KERN_INFO 853 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 854 tmpaddr = &addr; 855 write_lock(&idev->lock); 856 goto retry; 857 } 858 859 spin_lock_bh(&ift->lock); 860 ift->ifpub = ifp; 861 ift->valid_lft = tmp_valid_lft; 862 ift->prefered_lft = tmp_prefered_lft; 863 ift->cstamp = tmp_cstamp; 864 ift->tstamp = tmp_tstamp; 865 spin_unlock_bh(&ift->lock); 866 867 addrconf_dad_start(ift, 0); 868 in6_ifa_put(ift); 869 in6_dev_put(idev); 870 out: 871 return ret; 872 } 873 #endif 874 875 /* 876 * Choose an appropriate source address (RFC3484) 877 */ 878 struct ipv6_saddr_score { 879 int addr_type; 880 unsigned int attrs; 881 int matchlen; 882 int scope; 883 unsigned int rule; 884 }; 885 886 #define IPV6_SADDR_SCORE_LOCAL 0x0001 887 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 888 #define IPV6_SADDR_SCORE_HOA 0x0008 889 #define IPV6_SADDR_SCORE_OIF 0x0010 890 #define IPV6_SADDR_SCORE_LABEL 0x0020 891 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 892 893 static inline int ipv6_saddr_preferred(int type) 894 { 895 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 896 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 897 return 1; 898 return 0; 899 } 900 901 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 902 struct in6_addr *daddr, struct in6_addr *saddr) 903 { 904 struct ipv6_saddr_score hiscore; 905 struct inet6_ifaddr *ifa_result = NULL; 906 int daddr_type = __ipv6_addr_type(daddr); 907 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 908 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0; 909 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex); 910 struct net_device *dev; 911 912 memset(&hiscore, 0, sizeof(hiscore)); 913 914 read_lock(&dev_base_lock); 915 rcu_read_lock(); 916 917 for_each_netdev(&init_net, dev) { 918 struct inet6_dev *idev; 919 struct inet6_ifaddr *ifa; 920 921 /* Rule 0: Candidate Source Address (section 4) 922 * - multicast and link-local destination address, 923 * the set of candidate source address MUST only 924 * include addresses assigned to interfaces 925 * belonging to the same link as the outgoing 926 * interface. 927 * (- For site-local destination addresses, the 928 * set of candidate source addresses MUST only 929 * include addresses assigned to interfaces 930 * belonging to the same site as the outgoing 931 * interface.) 932 */ 933 if ((daddr_type & IPV6_ADDR_MULTICAST || 934 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 935 daddr_dev && dev != daddr_dev) 936 continue; 937 938 idev = __in6_dev_get(dev); 939 if (!idev) 940 continue; 941 942 read_lock_bh(&idev->lock); 943 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 944 struct ipv6_saddr_score score; 945 946 score.addr_type = __ipv6_addr_type(&ifa->addr); 947 948 /* Rule 0: 949 * - Tentative Address (RFC2462 section 5.4) 950 * - A tentative address is not considered 951 * "assigned to an interface" in the traditional 952 * sense, unless it is also flagged as optimistic. 953 * - Candidate Source Address (section 4) 954 * - In any case, anycast addresses, multicast 955 * addresses, and the unspecified address MUST 956 * NOT be included in a candidate set. 957 */ 958 if ((ifa->flags & IFA_F_TENTATIVE) && 959 (!(ifa->flags & IFA_F_OPTIMISTIC))) 960 continue; 961 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 962 score.addr_type & IPV6_ADDR_MULTICAST)) { 963 LIMIT_NETDEBUG(KERN_DEBUG 964 "ADDRCONF: unspecified / multicast address " 965 "assigned as unicast address on %s", 966 dev->name); 967 continue; 968 } 969 970 score.attrs = 0; 971 score.matchlen = 0; 972 score.scope = 0; 973 score.rule = 0; 974 975 if (ifa_result == NULL) { 976 /* record it if the first available entry */ 977 goto record_it; 978 } 979 980 /* Rule 1: Prefer same address */ 981 if (hiscore.rule < 1) { 982 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 983 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 984 hiscore.rule++; 985 } 986 if (ipv6_addr_equal(&ifa->addr, daddr)) { 987 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 988 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 989 score.rule = 1; 990 goto record_it; 991 } 992 } else { 993 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 994 continue; 995 } 996 997 /* Rule 2: Prefer appropriate scope */ 998 if (hiscore.rule < 2) { 999 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 1000 hiscore.rule++; 1001 } 1002 score.scope = __ipv6_addr_src_scope(score.addr_type); 1003 if (hiscore.scope < score.scope) { 1004 if (hiscore.scope < daddr_scope) { 1005 score.rule = 2; 1006 goto record_it; 1007 } else 1008 continue; 1009 } else if (score.scope < hiscore.scope) { 1010 if (score.scope < daddr_scope) 1011 break; /* addresses sorted by scope */ 1012 else { 1013 score.rule = 2; 1014 goto record_it; 1015 } 1016 } 1017 1018 /* Rule 3: Avoid deprecated and optimistic addresses */ 1019 if (hiscore.rule < 3) { 1020 if (ipv6_saddr_preferred(hiscore.addr_type) || 1021 (((ifa_result->flags & 1022 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) 1023 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1024 hiscore.rule++; 1025 } 1026 if (ipv6_saddr_preferred(score.addr_type) || 1027 (((ifa->flags & 1028 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) { 1029 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1030 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 1031 score.rule = 3; 1032 goto record_it; 1033 } 1034 } else { 1035 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 1036 continue; 1037 } 1038 1039 /* Rule 4: Prefer home address */ 1040 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 1041 if (hiscore.rule < 4) { 1042 if (ifa_result->flags & IFA_F_HOMEADDRESS) 1043 hiscore.attrs |= IPV6_SADDR_SCORE_HOA; 1044 hiscore.rule++; 1045 } 1046 if (ifa->flags & IFA_F_HOMEADDRESS) { 1047 score.attrs |= IPV6_SADDR_SCORE_HOA; 1048 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) { 1049 score.rule = 4; 1050 goto record_it; 1051 } 1052 } else { 1053 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA) 1054 continue; 1055 } 1056 #else 1057 if (hiscore.rule < 4) 1058 hiscore.rule++; 1059 #endif 1060 1061 /* Rule 5: Prefer outgoing interface */ 1062 if (hiscore.rule < 5) { 1063 if (daddr_dev == NULL || 1064 daddr_dev == ifa_result->idev->dev) 1065 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1066 hiscore.rule++; 1067 } 1068 if (daddr_dev == NULL || 1069 daddr_dev == ifa->idev->dev) { 1070 score.attrs |= IPV6_SADDR_SCORE_OIF; 1071 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1072 score.rule = 5; 1073 goto record_it; 1074 } 1075 } else { 1076 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1077 continue; 1078 } 1079 1080 /* Rule 6: Prefer matching label */ 1081 if (hiscore.rule < 6) { 1082 if (ipv6_addr_label(&ifa_result->addr, 1083 hiscore.addr_type, 1084 ifa_result->idev->dev->ifindex) == daddr_label) 1085 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1086 hiscore.rule++; 1087 } 1088 if (ipv6_addr_label(&ifa->addr, 1089 score.addr_type, 1090 ifa->idev->dev->ifindex) == daddr_label) { 1091 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1092 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1093 score.rule = 6; 1094 goto record_it; 1095 } 1096 } else { 1097 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1098 continue; 1099 } 1100 1101 #ifdef CONFIG_IPV6_PRIVACY 1102 /* Rule 7: Prefer public address 1103 * Note: prefer temprary address if use_tempaddr >= 2 1104 */ 1105 if (hiscore.rule < 7) { 1106 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1107 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1108 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1109 hiscore.rule++; 1110 } 1111 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1112 (ifa->idev->cnf.use_tempaddr >= 2)) { 1113 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1114 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1115 score.rule = 7; 1116 goto record_it; 1117 } 1118 } else { 1119 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1120 continue; 1121 } 1122 #else 1123 if (hiscore.rule < 7) 1124 hiscore.rule++; 1125 #endif 1126 /* Rule 8: Use longest matching prefix */ 1127 if (hiscore.rule < 8) { 1128 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1129 hiscore.rule++; 1130 } 1131 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1132 if (score.matchlen > hiscore.matchlen) { 1133 score.rule = 8; 1134 goto record_it; 1135 } 1136 #if 0 1137 else if (score.matchlen < hiscore.matchlen) 1138 continue; 1139 #endif 1140 1141 /* Final Rule: choose first available one */ 1142 continue; 1143 record_it: 1144 if (ifa_result) 1145 in6_ifa_put(ifa_result); 1146 in6_ifa_hold(ifa); 1147 ifa_result = ifa; 1148 hiscore = score; 1149 } 1150 read_unlock_bh(&idev->lock); 1151 } 1152 rcu_read_unlock(); 1153 read_unlock(&dev_base_lock); 1154 1155 if (!ifa_result) 1156 return -EADDRNOTAVAIL; 1157 1158 ipv6_addr_copy(saddr, &ifa_result->addr); 1159 in6_ifa_put(ifa_result); 1160 return 0; 1161 } 1162 1163 1164 int ipv6_get_saddr(struct dst_entry *dst, 1165 struct in6_addr *daddr, struct in6_addr *saddr) 1166 { 1167 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr); 1168 } 1169 1170 EXPORT_SYMBOL(ipv6_get_saddr); 1171 1172 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1173 unsigned char banned_flags) 1174 { 1175 struct inet6_dev *idev; 1176 int err = -EADDRNOTAVAIL; 1177 1178 rcu_read_lock(); 1179 if ((idev = __in6_dev_get(dev)) != NULL) { 1180 struct inet6_ifaddr *ifp; 1181 1182 read_lock_bh(&idev->lock); 1183 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1184 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1185 ipv6_addr_copy(addr, &ifp->addr); 1186 err = 0; 1187 break; 1188 } 1189 } 1190 read_unlock_bh(&idev->lock); 1191 } 1192 rcu_read_unlock(); 1193 return err; 1194 } 1195 1196 static int ipv6_count_addresses(struct inet6_dev *idev) 1197 { 1198 int cnt = 0; 1199 struct inet6_ifaddr *ifp; 1200 1201 read_lock_bh(&idev->lock); 1202 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1203 cnt++; 1204 read_unlock_bh(&idev->lock); 1205 return cnt; 1206 } 1207 1208 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1209 { 1210 struct inet6_ifaddr * ifp; 1211 u8 hash = ipv6_addr_hash(addr); 1212 1213 read_lock_bh(&addrconf_hash_lock); 1214 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1215 if (ipv6_addr_equal(&ifp->addr, addr) && 1216 !(ifp->flags&IFA_F_TENTATIVE)) { 1217 if (dev == NULL || ifp->idev->dev == dev || 1218 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1219 break; 1220 } 1221 } 1222 read_unlock_bh(&addrconf_hash_lock); 1223 return ifp != NULL; 1224 } 1225 1226 EXPORT_SYMBOL(ipv6_chk_addr); 1227 1228 static 1229 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1230 { 1231 struct inet6_ifaddr * ifp; 1232 u8 hash = ipv6_addr_hash(addr); 1233 1234 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1235 if (ipv6_addr_equal(&ifp->addr, addr)) { 1236 if (dev == NULL || ifp->idev->dev == dev) 1237 break; 1238 } 1239 } 1240 return ifp != NULL; 1241 } 1242 1243 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1244 { 1245 struct inet6_ifaddr * ifp; 1246 u8 hash = ipv6_addr_hash(addr); 1247 1248 read_lock_bh(&addrconf_hash_lock); 1249 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1250 if (ipv6_addr_equal(&ifp->addr, addr)) { 1251 if (dev == NULL || ifp->idev->dev == dev || 1252 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1253 in6_ifa_hold(ifp); 1254 break; 1255 } 1256 } 1257 } 1258 read_unlock_bh(&addrconf_hash_lock); 1259 1260 return ifp; 1261 } 1262 1263 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1264 { 1265 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1266 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1267 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1268 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1269 int sk_ipv6only = ipv6_only_sock(sk); 1270 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1271 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1272 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1273 1274 if (!sk2_rcv_saddr && !sk_ipv6only) 1275 return 1; 1276 1277 if (addr_type2 == IPV6_ADDR_ANY && 1278 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1279 return 1; 1280 1281 if (addr_type == IPV6_ADDR_ANY && 1282 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1283 return 1; 1284 1285 if (sk2_rcv_saddr6 && 1286 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1287 return 1; 1288 1289 if (addr_type == IPV6_ADDR_MAPPED && 1290 !sk2_ipv6only && 1291 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1292 return 1; 1293 1294 return 0; 1295 } 1296 1297 /* Gets referenced address, destroys ifaddr */ 1298 1299 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1300 { 1301 if (ifp->flags&IFA_F_PERMANENT) { 1302 spin_lock_bh(&ifp->lock); 1303 addrconf_del_timer(ifp); 1304 ifp->flags |= IFA_F_TENTATIVE; 1305 spin_unlock_bh(&ifp->lock); 1306 in6_ifa_put(ifp); 1307 #ifdef CONFIG_IPV6_PRIVACY 1308 } else if (ifp->flags&IFA_F_TEMPORARY) { 1309 struct inet6_ifaddr *ifpub; 1310 spin_lock_bh(&ifp->lock); 1311 ifpub = ifp->ifpub; 1312 if (ifpub) { 1313 in6_ifa_hold(ifpub); 1314 spin_unlock_bh(&ifp->lock); 1315 ipv6_create_tempaddr(ifpub, ifp); 1316 in6_ifa_put(ifpub); 1317 } else { 1318 spin_unlock_bh(&ifp->lock); 1319 } 1320 ipv6_del_addr(ifp); 1321 #endif 1322 } else 1323 ipv6_del_addr(ifp); 1324 } 1325 1326 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1327 { 1328 if (net_ratelimit()) 1329 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1330 addrconf_dad_stop(ifp); 1331 } 1332 1333 /* Join to solicited addr multicast group. */ 1334 1335 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1336 { 1337 struct in6_addr maddr; 1338 1339 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1340 return; 1341 1342 addrconf_addr_solict_mult(addr, &maddr); 1343 ipv6_dev_mc_inc(dev, &maddr); 1344 } 1345 1346 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1347 { 1348 struct in6_addr maddr; 1349 1350 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1351 return; 1352 1353 addrconf_addr_solict_mult(addr, &maddr); 1354 __ipv6_dev_mc_dec(idev, &maddr); 1355 } 1356 1357 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1358 { 1359 struct in6_addr addr; 1360 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1361 if (ipv6_addr_any(&addr)) 1362 return; 1363 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1364 } 1365 1366 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1367 { 1368 struct in6_addr addr; 1369 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1370 if (ipv6_addr_any(&addr)) 1371 return; 1372 __ipv6_dev_ac_dec(ifp->idev, &addr); 1373 } 1374 1375 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1376 { 1377 if (dev->addr_len != ETH_ALEN) 1378 return -1; 1379 memcpy(eui, dev->dev_addr, 3); 1380 memcpy(eui + 5, dev->dev_addr + 3, 3); 1381 1382 /* 1383 * The zSeries OSA network cards can be shared among various 1384 * OS instances, but the OSA cards have only one MAC address. 1385 * This leads to duplicate address conflicts in conjunction 1386 * with IPv6 if more than one instance uses the same card. 1387 * 1388 * The driver for these cards can deliver a unique 16-bit 1389 * identifier for each instance sharing the same card. It is 1390 * placed instead of 0xFFFE in the interface identifier. The 1391 * "u" bit of the interface identifier is not inverted in this 1392 * case. Hence the resulting interface identifier has local 1393 * scope according to RFC2373. 1394 */ 1395 if (dev->dev_id) { 1396 eui[3] = (dev->dev_id >> 8) & 0xFF; 1397 eui[4] = dev->dev_id & 0xFF; 1398 } else { 1399 eui[3] = 0xFF; 1400 eui[4] = 0xFE; 1401 eui[0] ^= 2; 1402 } 1403 return 0; 1404 } 1405 1406 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1407 { 1408 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1409 if (dev->addr_len != ARCNET_ALEN) 1410 return -1; 1411 memset(eui, 0, 7); 1412 eui[7] = *(u8*)dev->dev_addr; 1413 return 0; 1414 } 1415 1416 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1417 { 1418 if (dev->addr_len != INFINIBAND_ALEN) 1419 return -1; 1420 memcpy(eui, dev->dev_addr + 12, 8); 1421 eui[0] |= 2; 1422 return 0; 1423 } 1424 1425 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1426 { 1427 switch (dev->type) { 1428 case ARPHRD_ETHER: 1429 case ARPHRD_FDDI: 1430 case ARPHRD_IEEE802_TR: 1431 return addrconf_ifid_eui48(eui, dev); 1432 case ARPHRD_ARCNET: 1433 return addrconf_ifid_arcnet(eui, dev); 1434 case ARPHRD_INFINIBAND: 1435 return addrconf_ifid_infiniband(eui, dev); 1436 case ARPHRD_SIT: 1437 if (dev->priv_flags & IFF_ISATAP) 1438 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr); 1439 } 1440 return -1; 1441 } 1442 1443 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1444 { 1445 int err = -1; 1446 struct inet6_ifaddr *ifp; 1447 1448 read_lock_bh(&idev->lock); 1449 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1450 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1451 memcpy(eui, ifp->addr.s6_addr+8, 8); 1452 err = 0; 1453 break; 1454 } 1455 } 1456 read_unlock_bh(&idev->lock); 1457 return err; 1458 } 1459 1460 #ifdef CONFIG_IPV6_PRIVACY 1461 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1462 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1463 { 1464 regen: 1465 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1466 idev->rndid[0] &= ~0x02; 1467 1468 /* 1469 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1470 * check if generated address is not inappropriate 1471 * 1472 * - Reserved subnet anycast (RFC 2526) 1473 * 11111101 11....11 1xxxxxxx 1474 * - ISATAP (RFC4214) 6.1 1475 * 00-00-5E-FE-xx-xx-xx-xx 1476 * - value 0 1477 * - XXX: already assigned to an address on the device 1478 */ 1479 if (idev->rndid[0] == 0xfd && 1480 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1481 (idev->rndid[7]&0x80)) 1482 goto regen; 1483 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1484 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1485 goto regen; 1486 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1487 goto regen; 1488 } 1489 1490 return 0; 1491 } 1492 1493 static void ipv6_regen_rndid(unsigned long data) 1494 { 1495 struct inet6_dev *idev = (struct inet6_dev *) data; 1496 unsigned long expires; 1497 1498 rcu_read_lock_bh(); 1499 write_lock_bh(&idev->lock); 1500 1501 if (idev->dead) 1502 goto out; 1503 1504 if (__ipv6_regen_rndid(idev) < 0) 1505 goto out; 1506 1507 expires = jiffies + 1508 idev->cnf.temp_prefered_lft * HZ - 1509 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1510 if (time_before(expires, jiffies)) { 1511 printk(KERN_WARNING 1512 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1513 idev->dev->name); 1514 goto out; 1515 } 1516 1517 if (!mod_timer(&idev->regen_timer, expires)) 1518 in6_dev_hold(idev); 1519 1520 out: 1521 write_unlock_bh(&idev->lock); 1522 rcu_read_unlock_bh(); 1523 in6_dev_put(idev); 1524 } 1525 1526 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1527 int ret = 0; 1528 1529 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1530 ret = __ipv6_regen_rndid(idev); 1531 return ret; 1532 } 1533 #endif 1534 1535 /* 1536 * Add prefix route. 1537 */ 1538 1539 static void 1540 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1541 unsigned long expires, u32 flags) 1542 { 1543 struct fib6_config cfg = { 1544 .fc_table = RT6_TABLE_PREFIX, 1545 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1546 .fc_ifindex = dev->ifindex, 1547 .fc_expires = expires, 1548 .fc_dst_len = plen, 1549 .fc_flags = RTF_UP | flags, 1550 }; 1551 1552 ipv6_addr_copy(&cfg.fc_dst, pfx); 1553 1554 /* Prevent useless cloning on PtP SIT. 1555 This thing is done here expecting that the whole 1556 class of non-broadcast devices need not cloning. 1557 */ 1558 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1559 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1560 cfg.fc_flags |= RTF_NONEXTHOP; 1561 #endif 1562 1563 ip6_route_add(&cfg); 1564 } 1565 1566 /* Create "default" multicast route to the interface */ 1567 1568 static void addrconf_add_mroute(struct net_device *dev) 1569 { 1570 struct fib6_config cfg = { 1571 .fc_table = RT6_TABLE_LOCAL, 1572 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1573 .fc_ifindex = dev->ifindex, 1574 .fc_dst_len = 8, 1575 .fc_flags = RTF_UP, 1576 }; 1577 1578 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1579 1580 ip6_route_add(&cfg); 1581 } 1582 1583 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1584 static void sit_route_add(struct net_device *dev) 1585 { 1586 struct fib6_config cfg = { 1587 .fc_table = RT6_TABLE_MAIN, 1588 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1589 .fc_ifindex = dev->ifindex, 1590 .fc_dst_len = 96, 1591 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1592 }; 1593 1594 /* prefix length - 96 bits "::d.d.d.d" */ 1595 ip6_route_add(&cfg); 1596 } 1597 #endif 1598 1599 static void addrconf_add_lroute(struct net_device *dev) 1600 { 1601 struct in6_addr addr; 1602 1603 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1604 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1605 } 1606 1607 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1608 { 1609 struct inet6_dev *idev; 1610 1611 ASSERT_RTNL(); 1612 1613 if ((idev = ipv6_find_idev(dev)) == NULL) 1614 return NULL; 1615 1616 /* Add default multicast route */ 1617 addrconf_add_mroute(dev); 1618 1619 /* Add link local route */ 1620 addrconf_add_lroute(dev); 1621 return idev; 1622 } 1623 1624 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1625 { 1626 struct prefix_info *pinfo; 1627 __u32 valid_lft; 1628 __u32 prefered_lft; 1629 int addr_type; 1630 unsigned long rt_expires; 1631 struct inet6_dev *in6_dev; 1632 1633 pinfo = (struct prefix_info *) opt; 1634 1635 if (len < sizeof(struct prefix_info)) { 1636 ADBG(("addrconf: prefix option too short\n")); 1637 return; 1638 } 1639 1640 /* 1641 * Validation checks ([ADDRCONF], page 19) 1642 */ 1643 1644 addr_type = ipv6_addr_type(&pinfo->prefix); 1645 1646 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1647 return; 1648 1649 valid_lft = ntohl(pinfo->valid); 1650 prefered_lft = ntohl(pinfo->prefered); 1651 1652 if (prefered_lft > valid_lft) { 1653 if (net_ratelimit()) 1654 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1655 return; 1656 } 1657 1658 in6_dev = in6_dev_get(dev); 1659 1660 if (in6_dev == NULL) { 1661 if (net_ratelimit()) 1662 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1663 return; 1664 } 1665 1666 /* 1667 * Two things going on here: 1668 * 1) Add routes for on-link prefixes 1669 * 2) Configure prefixes with the auto flag set 1670 */ 1671 1672 /* Avoid arithmetic overflow. Really, we could 1673 save rt_expires in seconds, likely valid_lft, 1674 but it would require division in fib gc, that it 1675 not good. 1676 */ 1677 if (valid_lft >= 0x7FFFFFFF/HZ) 1678 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1679 else 1680 rt_expires = valid_lft * HZ; 1681 1682 /* 1683 * We convert this (in jiffies) to clock_t later. 1684 * Avoid arithmetic overflow there as well. 1685 * Overflow can happen only if HZ < USER_HZ. 1686 */ 1687 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1688 rt_expires = 0x7FFFFFFF / USER_HZ; 1689 1690 if (pinfo->onlink) { 1691 struct rt6_info *rt; 1692 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1693 1694 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1695 if (rt->rt6i_flags&RTF_EXPIRES) { 1696 if (valid_lft == 0) { 1697 ip6_del_rt(rt); 1698 rt = NULL; 1699 } else { 1700 rt->rt6i_expires = jiffies + rt_expires; 1701 } 1702 } 1703 } else if (valid_lft) { 1704 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1705 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1706 } 1707 if (rt) 1708 dst_release(&rt->u.dst); 1709 } 1710 1711 /* Try to figure out our local address for this prefix */ 1712 1713 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1714 struct inet6_ifaddr * ifp; 1715 struct in6_addr addr; 1716 int create = 0, update_lft = 0; 1717 1718 if (pinfo->prefix_len == 64) { 1719 memcpy(&addr, &pinfo->prefix, 8); 1720 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1721 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1722 in6_dev_put(in6_dev); 1723 return; 1724 } 1725 goto ok; 1726 } 1727 if (net_ratelimit()) 1728 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1729 pinfo->prefix_len); 1730 in6_dev_put(in6_dev); 1731 return; 1732 1733 ok: 1734 1735 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1736 1737 if (ifp == NULL && valid_lft) { 1738 int max_addresses = in6_dev->cnf.max_addresses; 1739 u32 addr_flags = 0; 1740 1741 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1742 if (in6_dev->cnf.optimistic_dad && 1743 !ipv6_devconf.forwarding) 1744 addr_flags = IFA_F_OPTIMISTIC; 1745 #endif 1746 1747 /* Do not allow to create too much of autoconfigured 1748 * addresses; this would be too easy way to crash kernel. 1749 */ 1750 if (!max_addresses || 1751 ipv6_count_addresses(in6_dev) < max_addresses) 1752 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1753 addr_type&IPV6_ADDR_SCOPE_MASK, 1754 addr_flags); 1755 1756 if (!ifp || IS_ERR(ifp)) { 1757 in6_dev_put(in6_dev); 1758 return; 1759 } 1760 1761 update_lft = create = 1; 1762 ifp->cstamp = jiffies; 1763 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1764 } 1765 1766 if (ifp) { 1767 int flags; 1768 unsigned long now; 1769 #ifdef CONFIG_IPV6_PRIVACY 1770 struct inet6_ifaddr *ift; 1771 #endif 1772 u32 stored_lft; 1773 1774 /* update lifetime (RFC2462 5.5.3 e) */ 1775 spin_lock(&ifp->lock); 1776 now = jiffies; 1777 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1778 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1779 else 1780 stored_lft = 0; 1781 if (!update_lft && stored_lft) { 1782 if (valid_lft > MIN_VALID_LIFETIME || 1783 valid_lft > stored_lft) 1784 update_lft = 1; 1785 else if (stored_lft <= MIN_VALID_LIFETIME) { 1786 /* valid_lft <= stored_lft is always true */ 1787 /* XXX: IPsec */ 1788 update_lft = 0; 1789 } else { 1790 valid_lft = MIN_VALID_LIFETIME; 1791 if (valid_lft < prefered_lft) 1792 prefered_lft = valid_lft; 1793 update_lft = 1; 1794 } 1795 } 1796 1797 if (update_lft) { 1798 ifp->valid_lft = valid_lft; 1799 ifp->prefered_lft = prefered_lft; 1800 ifp->tstamp = now; 1801 flags = ifp->flags; 1802 ifp->flags &= ~IFA_F_DEPRECATED; 1803 spin_unlock(&ifp->lock); 1804 1805 if (!(flags&IFA_F_TENTATIVE)) 1806 ipv6_ifa_notify(0, ifp); 1807 } else 1808 spin_unlock(&ifp->lock); 1809 1810 #ifdef CONFIG_IPV6_PRIVACY 1811 read_lock_bh(&in6_dev->lock); 1812 /* update all temporary addresses in the list */ 1813 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1814 /* 1815 * When adjusting the lifetimes of an existing 1816 * temporary address, only lower the lifetimes. 1817 * Implementations must not increase the 1818 * lifetimes of an existing temporary address 1819 * when processing a Prefix Information Option. 1820 */ 1821 spin_lock(&ift->lock); 1822 flags = ift->flags; 1823 if (ift->valid_lft > valid_lft && 1824 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1825 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1826 if (ift->prefered_lft > prefered_lft && 1827 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1828 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1829 spin_unlock(&ift->lock); 1830 if (!(flags&IFA_F_TENTATIVE)) 1831 ipv6_ifa_notify(0, ift); 1832 } 1833 1834 if (create && in6_dev->cnf.use_tempaddr > 0) { 1835 /* 1836 * When a new public address is created as described in [ADDRCONF], 1837 * also create a new temporary address. 1838 */ 1839 read_unlock_bh(&in6_dev->lock); 1840 ipv6_create_tempaddr(ifp, NULL); 1841 } else { 1842 read_unlock_bh(&in6_dev->lock); 1843 } 1844 #endif 1845 in6_ifa_put(ifp); 1846 addrconf_verify(0); 1847 } 1848 } 1849 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1850 in6_dev_put(in6_dev); 1851 } 1852 1853 /* 1854 * Set destination address. 1855 * Special case for SIT interfaces where we create a new "virtual" 1856 * device. 1857 */ 1858 int addrconf_set_dstaddr(void __user *arg) 1859 { 1860 struct in6_ifreq ireq; 1861 struct net_device *dev; 1862 int err = -EINVAL; 1863 1864 rtnl_lock(); 1865 1866 err = -EFAULT; 1867 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1868 goto err_exit; 1869 1870 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex); 1871 1872 err = -ENODEV; 1873 if (dev == NULL) 1874 goto err_exit; 1875 1876 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1877 if (dev->type == ARPHRD_SIT) { 1878 struct ifreq ifr; 1879 mm_segment_t oldfs; 1880 struct ip_tunnel_parm p; 1881 1882 err = -EADDRNOTAVAIL; 1883 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1884 goto err_exit; 1885 1886 memset(&p, 0, sizeof(p)); 1887 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1888 p.iph.saddr = 0; 1889 p.iph.version = 4; 1890 p.iph.ihl = 5; 1891 p.iph.protocol = IPPROTO_IPV6; 1892 p.iph.ttl = 64; 1893 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1894 1895 oldfs = get_fs(); set_fs(KERNEL_DS); 1896 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1897 set_fs(oldfs); 1898 1899 if (err == 0) { 1900 err = -ENOBUFS; 1901 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL) 1902 goto err_exit; 1903 err = dev_open(dev); 1904 } 1905 } 1906 #endif 1907 1908 err_exit: 1909 rtnl_unlock(); 1910 return err; 1911 } 1912 1913 /* 1914 * Manual configuration of address on an interface 1915 */ 1916 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1917 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft) 1918 { 1919 struct inet6_ifaddr *ifp; 1920 struct inet6_dev *idev; 1921 struct net_device *dev; 1922 int scope; 1923 u32 flags = RTF_EXPIRES; 1924 1925 ASSERT_RTNL(); 1926 1927 /* check the lifetime */ 1928 if (!valid_lft || prefered_lft > valid_lft) 1929 return -EINVAL; 1930 1931 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL) 1932 return -ENODEV; 1933 1934 if ((idev = addrconf_add_dev(dev)) == NULL) 1935 return -ENOBUFS; 1936 1937 scope = ipv6_addr_scope(pfx); 1938 1939 if (valid_lft == INFINITY_LIFE_TIME) { 1940 ifa_flags |= IFA_F_PERMANENT; 1941 flags = 0; 1942 } else if (valid_lft >= 0x7FFFFFFF/HZ) 1943 valid_lft = 0x7FFFFFFF/HZ; 1944 1945 if (prefered_lft == 0) 1946 ifa_flags |= IFA_F_DEPRECATED; 1947 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1948 (prefered_lft != INFINITY_LIFE_TIME)) 1949 prefered_lft = 0x7FFFFFFF/HZ; 1950 1951 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1952 1953 if (!IS_ERR(ifp)) { 1954 spin_lock_bh(&ifp->lock); 1955 ifp->valid_lft = valid_lft; 1956 ifp->prefered_lft = prefered_lft; 1957 ifp->tstamp = jiffies; 1958 spin_unlock_bh(&ifp->lock); 1959 1960 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 1961 jiffies_to_clock_t(valid_lft * HZ), flags); 1962 /* 1963 * Note that section 3.1 of RFC 4429 indicates 1964 * that the Optimistic flag should not be set for 1965 * manually configured addresses 1966 */ 1967 addrconf_dad_start(ifp, 0); 1968 in6_ifa_put(ifp); 1969 addrconf_verify(0); 1970 return 0; 1971 } 1972 1973 return PTR_ERR(ifp); 1974 } 1975 1976 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1977 { 1978 struct inet6_ifaddr *ifp; 1979 struct inet6_dev *idev; 1980 struct net_device *dev; 1981 1982 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL) 1983 return -ENODEV; 1984 1985 if ((idev = __in6_dev_get(dev)) == NULL) 1986 return -ENXIO; 1987 1988 read_lock_bh(&idev->lock); 1989 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1990 if (ifp->prefix_len == plen && 1991 ipv6_addr_equal(pfx, &ifp->addr)) { 1992 in6_ifa_hold(ifp); 1993 read_unlock_bh(&idev->lock); 1994 1995 ipv6_del_addr(ifp); 1996 1997 /* If the last address is deleted administratively, 1998 disable IPv6 on this interface. 1999 */ 2000 if (idev->addr_list == NULL) 2001 addrconf_ifdown(idev->dev, 1); 2002 return 0; 2003 } 2004 } 2005 read_unlock_bh(&idev->lock); 2006 return -EADDRNOTAVAIL; 2007 } 2008 2009 2010 int addrconf_add_ifaddr(void __user *arg) 2011 { 2012 struct in6_ifreq ireq; 2013 int err; 2014 2015 if (!capable(CAP_NET_ADMIN)) 2016 return -EPERM; 2017 2018 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2019 return -EFAULT; 2020 2021 rtnl_lock(); 2022 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 2023 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2024 rtnl_unlock(); 2025 return err; 2026 } 2027 2028 int addrconf_del_ifaddr(void __user *arg) 2029 { 2030 struct in6_ifreq ireq; 2031 int err; 2032 2033 if (!capable(CAP_NET_ADMIN)) 2034 return -EPERM; 2035 2036 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2037 return -EFAULT; 2038 2039 rtnl_lock(); 2040 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 2041 rtnl_unlock(); 2042 return err; 2043 } 2044 2045 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2046 static void sit_add_v4_addrs(struct inet6_dev *idev) 2047 { 2048 struct inet6_ifaddr * ifp; 2049 struct in6_addr addr; 2050 struct net_device *dev; 2051 int scope; 2052 2053 ASSERT_RTNL(); 2054 2055 memset(&addr, 0, sizeof(struct in6_addr)); 2056 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2057 2058 if (idev->dev->flags&IFF_POINTOPOINT) { 2059 addr.s6_addr32[0] = htonl(0xfe800000); 2060 scope = IFA_LINK; 2061 } else { 2062 scope = IPV6_ADDR_COMPATv4; 2063 } 2064 2065 if (addr.s6_addr32[3]) { 2066 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2067 if (!IS_ERR(ifp)) { 2068 spin_lock_bh(&ifp->lock); 2069 ifp->flags &= ~IFA_F_TENTATIVE; 2070 spin_unlock_bh(&ifp->lock); 2071 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2072 in6_ifa_put(ifp); 2073 } 2074 return; 2075 } 2076 2077 for_each_netdev(&init_net, dev) { 2078 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2079 if (in_dev && (dev->flags & IFF_UP)) { 2080 struct in_ifaddr * ifa; 2081 2082 int flag = scope; 2083 2084 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2085 int plen; 2086 2087 addr.s6_addr32[3] = ifa->ifa_local; 2088 2089 if (ifa->ifa_scope == RT_SCOPE_LINK) 2090 continue; 2091 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2092 if (idev->dev->flags&IFF_POINTOPOINT) 2093 continue; 2094 flag |= IFA_HOST; 2095 } 2096 if (idev->dev->flags&IFF_POINTOPOINT) 2097 plen = 64; 2098 else 2099 plen = 96; 2100 2101 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2102 IFA_F_PERMANENT); 2103 if (!IS_ERR(ifp)) { 2104 spin_lock_bh(&ifp->lock); 2105 ifp->flags &= ~IFA_F_TENTATIVE; 2106 spin_unlock_bh(&ifp->lock); 2107 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2108 in6_ifa_put(ifp); 2109 } 2110 } 2111 } 2112 } 2113 } 2114 #endif 2115 2116 static void init_loopback(struct net_device *dev) 2117 { 2118 struct inet6_dev *idev; 2119 struct inet6_ifaddr * ifp; 2120 2121 /* ::1 */ 2122 2123 ASSERT_RTNL(); 2124 2125 if ((idev = ipv6_find_idev(dev)) == NULL) { 2126 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2127 return; 2128 } 2129 2130 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2131 if (!IS_ERR(ifp)) { 2132 spin_lock_bh(&ifp->lock); 2133 ifp->flags &= ~IFA_F_TENTATIVE; 2134 spin_unlock_bh(&ifp->lock); 2135 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2136 in6_ifa_put(ifp); 2137 } 2138 } 2139 2140 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2141 { 2142 struct inet6_ifaddr * ifp; 2143 u32 addr_flags = IFA_F_PERMANENT; 2144 2145 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2146 if (idev->cnf.optimistic_dad && 2147 !ipv6_devconf.forwarding) 2148 addr_flags |= IFA_F_OPTIMISTIC; 2149 #endif 2150 2151 2152 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2153 if (!IS_ERR(ifp)) { 2154 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2155 addrconf_dad_start(ifp, 0); 2156 in6_ifa_put(ifp); 2157 } 2158 } 2159 2160 static void addrconf_dev_config(struct net_device *dev) 2161 { 2162 struct in6_addr addr; 2163 struct inet6_dev * idev; 2164 2165 ASSERT_RTNL(); 2166 2167 if ((dev->type != ARPHRD_ETHER) && 2168 (dev->type != ARPHRD_FDDI) && 2169 (dev->type != ARPHRD_IEEE802_TR) && 2170 (dev->type != ARPHRD_ARCNET) && 2171 (dev->type != ARPHRD_INFINIBAND)) { 2172 /* Alas, we support only Ethernet autoconfiguration. */ 2173 return; 2174 } 2175 2176 idev = addrconf_add_dev(dev); 2177 if (idev == NULL) 2178 return; 2179 2180 memset(&addr, 0, sizeof(struct in6_addr)); 2181 addr.s6_addr32[0] = htonl(0xFE800000); 2182 2183 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2184 addrconf_add_linklocal(idev, &addr); 2185 } 2186 2187 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2188 static void addrconf_sit_config(struct net_device *dev) 2189 { 2190 struct inet6_dev *idev; 2191 2192 ASSERT_RTNL(); 2193 2194 /* 2195 * Configure the tunnel with one of our IPv4 2196 * addresses... we should configure all of 2197 * our v4 addrs in the tunnel 2198 */ 2199 2200 if ((idev = ipv6_find_idev(dev)) == NULL) { 2201 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2202 return; 2203 } 2204 2205 if (dev->priv_flags & IFF_ISATAP) { 2206 struct in6_addr addr; 2207 2208 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2209 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2210 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2211 addrconf_add_linklocal(idev, &addr); 2212 return; 2213 } 2214 2215 sit_add_v4_addrs(idev); 2216 2217 if (dev->flags&IFF_POINTOPOINT) { 2218 addrconf_add_mroute(dev); 2219 addrconf_add_lroute(dev); 2220 } else 2221 sit_route_add(dev); 2222 } 2223 #endif 2224 2225 static inline int 2226 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2227 { 2228 struct in6_addr lladdr; 2229 2230 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2231 addrconf_add_linklocal(idev, &lladdr); 2232 return 0; 2233 } 2234 return -1; 2235 } 2236 2237 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2238 { 2239 struct net_device *link_dev; 2240 2241 /* first try to inherit the link-local address from the link device */ 2242 if (idev->dev->iflink && 2243 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) { 2244 if (!ipv6_inherit_linklocal(idev, link_dev)) 2245 return; 2246 } 2247 /* then try to inherit it from any device */ 2248 for_each_netdev(&init_net, link_dev) { 2249 if (!ipv6_inherit_linklocal(idev, link_dev)) 2250 return; 2251 } 2252 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2253 } 2254 2255 /* 2256 * Autoconfigure tunnel with a link-local address so routing protocols, 2257 * DHCPv6, MLD etc. can be run over the virtual link 2258 */ 2259 2260 static void addrconf_ip6_tnl_config(struct net_device *dev) 2261 { 2262 struct inet6_dev *idev; 2263 2264 ASSERT_RTNL(); 2265 2266 if ((idev = addrconf_add_dev(dev)) == NULL) { 2267 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2268 return; 2269 } 2270 ip6_tnl_add_linklocal(idev); 2271 } 2272 2273 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2274 void * data) 2275 { 2276 struct net_device *dev = (struct net_device *) data; 2277 struct inet6_dev *idev = __in6_dev_get(dev); 2278 int run_pending = 0; 2279 int err; 2280 2281 if (dev->nd_net != &init_net) 2282 return NOTIFY_DONE; 2283 2284 switch(event) { 2285 case NETDEV_REGISTER: 2286 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2287 idev = ipv6_add_dev(dev); 2288 if (!idev) 2289 return notifier_from_errno(-ENOMEM); 2290 } 2291 break; 2292 case NETDEV_UP: 2293 case NETDEV_CHANGE: 2294 if (dev->flags & IFF_SLAVE) 2295 break; 2296 2297 if (event == NETDEV_UP) { 2298 if (!addrconf_qdisc_ok(dev)) { 2299 /* device is not ready yet. */ 2300 printk(KERN_INFO 2301 "ADDRCONF(NETDEV_UP): %s: " 2302 "link is not ready\n", 2303 dev->name); 2304 break; 2305 } 2306 2307 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2308 idev = ipv6_add_dev(dev); 2309 2310 if (idev) 2311 idev->if_flags |= IF_READY; 2312 } else { 2313 if (!addrconf_qdisc_ok(dev)) { 2314 /* device is still not ready. */ 2315 break; 2316 } 2317 2318 if (idev) { 2319 if (idev->if_flags & IF_READY) { 2320 /* device is already configured. */ 2321 break; 2322 } 2323 idev->if_flags |= IF_READY; 2324 } 2325 2326 printk(KERN_INFO 2327 "ADDRCONF(NETDEV_CHANGE): %s: " 2328 "link becomes ready\n", 2329 dev->name); 2330 2331 run_pending = 1; 2332 } 2333 2334 switch(dev->type) { 2335 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2336 case ARPHRD_SIT: 2337 addrconf_sit_config(dev); 2338 break; 2339 #endif 2340 case ARPHRD_TUNNEL6: 2341 addrconf_ip6_tnl_config(dev); 2342 break; 2343 case ARPHRD_LOOPBACK: 2344 init_loopback(dev); 2345 break; 2346 2347 default: 2348 addrconf_dev_config(dev); 2349 break; 2350 } 2351 if (idev) { 2352 if (run_pending) 2353 addrconf_dad_run(idev); 2354 2355 /* If the MTU changed during the interface down, when the 2356 interface up, the changed MTU must be reflected in the 2357 idev as well as routers. 2358 */ 2359 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2360 rt6_mtu_change(dev, dev->mtu); 2361 idev->cnf.mtu6 = dev->mtu; 2362 } 2363 idev->tstamp = jiffies; 2364 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2365 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2366 stop IPv6 on this interface. 2367 */ 2368 if (dev->mtu < IPV6_MIN_MTU) 2369 addrconf_ifdown(dev, event != NETDEV_DOWN); 2370 } 2371 break; 2372 2373 case NETDEV_CHANGEMTU: 2374 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2375 rt6_mtu_change(dev, dev->mtu); 2376 idev->cnf.mtu6 = dev->mtu; 2377 break; 2378 } 2379 2380 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2381 idev = ipv6_add_dev(dev); 2382 if (idev) 2383 break; 2384 } 2385 2386 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2387 2388 case NETDEV_DOWN: 2389 case NETDEV_UNREGISTER: 2390 /* 2391 * Remove all addresses from this interface. 2392 */ 2393 addrconf_ifdown(dev, event != NETDEV_DOWN); 2394 break; 2395 2396 case NETDEV_CHANGENAME: 2397 if (idev) { 2398 snmp6_unregister_dev(idev); 2399 addrconf_sysctl_unregister(idev); 2400 addrconf_sysctl_register(idev); 2401 err = snmp6_register_dev(idev); 2402 if (err) 2403 return notifier_from_errno(err); 2404 } 2405 break; 2406 } 2407 2408 return NOTIFY_OK; 2409 } 2410 2411 /* 2412 * addrconf module should be notified of a device going up 2413 */ 2414 static struct notifier_block ipv6_dev_notf = { 2415 .notifier_call = addrconf_notify, 2416 .priority = 0 2417 }; 2418 2419 static int addrconf_ifdown(struct net_device *dev, int how) 2420 { 2421 struct inet6_dev *idev; 2422 struct inet6_ifaddr *ifa, **bifa; 2423 int i; 2424 2425 ASSERT_RTNL(); 2426 2427 if (dev == init_net.loopback_dev && how == 1) 2428 how = 0; 2429 2430 rt6_ifdown(dev); 2431 neigh_ifdown(&nd_tbl, dev); 2432 2433 idev = __in6_dev_get(dev); 2434 if (idev == NULL) 2435 return -ENODEV; 2436 2437 /* Step 1: remove reference to ipv6 device from parent device. 2438 Do not dev_put! 2439 */ 2440 if (how == 1) { 2441 idev->dead = 1; 2442 2443 /* protected by rtnl_lock */ 2444 rcu_assign_pointer(dev->ip6_ptr, NULL); 2445 2446 /* Step 1.5: remove snmp6 entry */ 2447 snmp6_unregister_dev(idev); 2448 2449 } 2450 2451 /* Step 2: clear hash table */ 2452 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2453 bifa = &inet6_addr_lst[i]; 2454 2455 write_lock_bh(&addrconf_hash_lock); 2456 while ((ifa = *bifa) != NULL) { 2457 if (ifa->idev == idev) { 2458 *bifa = ifa->lst_next; 2459 ifa->lst_next = NULL; 2460 addrconf_del_timer(ifa); 2461 in6_ifa_put(ifa); 2462 continue; 2463 } 2464 bifa = &ifa->lst_next; 2465 } 2466 write_unlock_bh(&addrconf_hash_lock); 2467 } 2468 2469 write_lock_bh(&idev->lock); 2470 2471 /* Step 3: clear flags for stateless addrconf */ 2472 if (how != 1) 2473 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2474 2475 /* Step 4: clear address list */ 2476 #ifdef CONFIG_IPV6_PRIVACY 2477 if (how == 1 && del_timer(&idev->regen_timer)) 2478 in6_dev_put(idev); 2479 2480 /* clear tempaddr list */ 2481 while ((ifa = idev->tempaddr_list) != NULL) { 2482 idev->tempaddr_list = ifa->tmp_next; 2483 ifa->tmp_next = NULL; 2484 ifa->dead = 1; 2485 write_unlock_bh(&idev->lock); 2486 spin_lock_bh(&ifa->lock); 2487 2488 if (ifa->ifpub) { 2489 in6_ifa_put(ifa->ifpub); 2490 ifa->ifpub = NULL; 2491 } 2492 spin_unlock_bh(&ifa->lock); 2493 in6_ifa_put(ifa); 2494 write_lock_bh(&idev->lock); 2495 } 2496 #endif 2497 while ((ifa = idev->addr_list) != NULL) { 2498 idev->addr_list = ifa->if_next; 2499 ifa->if_next = NULL; 2500 ifa->dead = 1; 2501 addrconf_del_timer(ifa); 2502 write_unlock_bh(&idev->lock); 2503 2504 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2505 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2506 in6_ifa_put(ifa); 2507 2508 write_lock_bh(&idev->lock); 2509 } 2510 write_unlock_bh(&idev->lock); 2511 2512 /* Step 5: Discard multicast list */ 2513 2514 if (how == 1) 2515 ipv6_mc_destroy_dev(idev); 2516 else 2517 ipv6_mc_down(idev); 2518 2519 idev->tstamp = jiffies; 2520 2521 /* Shot the device (if unregistered) */ 2522 2523 if (how == 1) { 2524 addrconf_sysctl_unregister(idev); 2525 neigh_parms_release(&nd_tbl, idev->nd_parms); 2526 neigh_ifdown(&nd_tbl, dev); 2527 in6_dev_put(idev); 2528 } 2529 return 0; 2530 } 2531 2532 static void addrconf_rs_timer(unsigned long data) 2533 { 2534 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2535 2536 if (ifp->idev->cnf.forwarding) 2537 goto out; 2538 2539 if (ifp->idev->if_flags & IF_RA_RCVD) { 2540 /* 2541 * Announcement received after solicitation 2542 * was sent 2543 */ 2544 goto out; 2545 } 2546 2547 spin_lock(&ifp->lock); 2548 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2549 struct in6_addr all_routers; 2550 2551 /* The wait after the last probe can be shorter */ 2552 addrconf_mod_timer(ifp, AC_RS, 2553 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2554 ifp->idev->cnf.rtr_solicit_delay : 2555 ifp->idev->cnf.rtr_solicit_interval); 2556 spin_unlock(&ifp->lock); 2557 2558 ipv6_addr_all_routers(&all_routers); 2559 2560 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2561 } else { 2562 spin_unlock(&ifp->lock); 2563 /* 2564 * Note: we do not support deprecated "all on-link" 2565 * assumption any longer. 2566 */ 2567 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2568 ifp->idev->dev->name); 2569 } 2570 2571 out: 2572 in6_ifa_put(ifp); 2573 } 2574 2575 /* 2576 * Duplicate Address Detection 2577 */ 2578 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2579 { 2580 unsigned long rand_num; 2581 struct inet6_dev *idev = ifp->idev; 2582 2583 if (ifp->flags & IFA_F_OPTIMISTIC) 2584 rand_num = 0; 2585 else 2586 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2587 2588 ifp->probes = idev->cnf.dad_transmits; 2589 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2590 } 2591 2592 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2593 { 2594 struct inet6_dev *idev = ifp->idev; 2595 struct net_device *dev = idev->dev; 2596 2597 addrconf_join_solict(dev, &ifp->addr); 2598 2599 net_srandom(ifp->addr.s6_addr32[3]); 2600 2601 read_lock_bh(&idev->lock); 2602 if (ifp->dead) 2603 goto out; 2604 spin_lock_bh(&ifp->lock); 2605 2606 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2607 !(ifp->flags&IFA_F_TENTATIVE) || 2608 ifp->flags & IFA_F_NODAD) { 2609 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2610 spin_unlock_bh(&ifp->lock); 2611 read_unlock_bh(&idev->lock); 2612 2613 addrconf_dad_completed(ifp); 2614 return; 2615 } 2616 2617 if (!(idev->if_flags & IF_READY)) { 2618 spin_unlock_bh(&ifp->lock); 2619 read_unlock_bh(&idev->lock); 2620 /* 2621 * If the defice is not ready: 2622 * - keep it tentative if it is a permanent address. 2623 * - otherwise, kill it. 2624 */ 2625 in6_ifa_hold(ifp); 2626 addrconf_dad_stop(ifp); 2627 return; 2628 } 2629 2630 /* 2631 * Optimistic nodes can start receiving 2632 * Frames right away 2633 */ 2634 if(ifp->flags & IFA_F_OPTIMISTIC) 2635 ip6_ins_rt(ifp->rt); 2636 2637 addrconf_dad_kick(ifp); 2638 spin_unlock_bh(&ifp->lock); 2639 out: 2640 read_unlock_bh(&idev->lock); 2641 } 2642 2643 static void addrconf_dad_timer(unsigned long data) 2644 { 2645 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2646 struct inet6_dev *idev = ifp->idev; 2647 struct in6_addr unspec; 2648 struct in6_addr mcaddr; 2649 2650 read_lock_bh(&idev->lock); 2651 if (idev->dead) { 2652 read_unlock_bh(&idev->lock); 2653 goto out; 2654 } 2655 spin_lock_bh(&ifp->lock); 2656 if (ifp->probes == 0) { 2657 /* 2658 * DAD was successful 2659 */ 2660 2661 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2662 spin_unlock_bh(&ifp->lock); 2663 read_unlock_bh(&idev->lock); 2664 2665 addrconf_dad_completed(ifp); 2666 2667 goto out; 2668 } 2669 2670 ifp->probes--; 2671 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2672 spin_unlock_bh(&ifp->lock); 2673 read_unlock_bh(&idev->lock); 2674 2675 /* send a neighbour solicitation for our addr */ 2676 memset(&unspec, 0, sizeof(unspec)); 2677 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2678 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2679 out: 2680 in6_ifa_put(ifp); 2681 } 2682 2683 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2684 { 2685 struct net_device * dev = ifp->idev->dev; 2686 2687 /* 2688 * Configure the address for reception. Now it is valid. 2689 */ 2690 2691 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2692 2693 /* If added prefix is link local and forwarding is off, 2694 start sending router solicitations. 2695 */ 2696 2697 if (ifp->idev->cnf.forwarding == 0 && 2698 ifp->idev->cnf.rtr_solicits > 0 && 2699 (dev->flags&IFF_LOOPBACK) == 0 && 2700 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2701 struct in6_addr all_routers; 2702 2703 ipv6_addr_all_routers(&all_routers); 2704 2705 /* 2706 * If a host as already performed a random delay 2707 * [...] as part of DAD [...] there is no need 2708 * to delay again before sending the first RS 2709 */ 2710 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2711 2712 spin_lock_bh(&ifp->lock); 2713 ifp->probes = 1; 2714 ifp->idev->if_flags |= IF_RS_SENT; 2715 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2716 spin_unlock_bh(&ifp->lock); 2717 } 2718 } 2719 2720 static void addrconf_dad_run(struct inet6_dev *idev) { 2721 struct inet6_ifaddr *ifp; 2722 2723 read_lock_bh(&idev->lock); 2724 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2725 spin_lock_bh(&ifp->lock); 2726 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2727 spin_unlock_bh(&ifp->lock); 2728 continue; 2729 } 2730 spin_unlock_bh(&ifp->lock); 2731 addrconf_dad_kick(ifp); 2732 } 2733 read_unlock_bh(&idev->lock); 2734 } 2735 2736 #ifdef CONFIG_PROC_FS 2737 struct if6_iter_state { 2738 int bucket; 2739 }; 2740 2741 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2742 { 2743 struct inet6_ifaddr *ifa = NULL; 2744 struct if6_iter_state *state = seq->private; 2745 2746 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2747 ifa = inet6_addr_lst[state->bucket]; 2748 if (ifa) 2749 break; 2750 } 2751 return ifa; 2752 } 2753 2754 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2755 { 2756 struct if6_iter_state *state = seq->private; 2757 2758 ifa = ifa->lst_next; 2759 try_again: 2760 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2761 ifa = inet6_addr_lst[state->bucket]; 2762 goto try_again; 2763 } 2764 return ifa; 2765 } 2766 2767 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2768 { 2769 struct inet6_ifaddr *ifa = if6_get_first(seq); 2770 2771 if (ifa) 2772 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2773 --pos; 2774 return pos ? NULL : ifa; 2775 } 2776 2777 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2778 { 2779 read_lock_bh(&addrconf_hash_lock); 2780 return if6_get_idx(seq, *pos); 2781 } 2782 2783 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2784 { 2785 struct inet6_ifaddr *ifa; 2786 2787 ifa = if6_get_next(seq, v); 2788 ++*pos; 2789 return ifa; 2790 } 2791 2792 static void if6_seq_stop(struct seq_file *seq, void *v) 2793 { 2794 read_unlock_bh(&addrconf_hash_lock); 2795 } 2796 2797 static int if6_seq_show(struct seq_file *seq, void *v) 2798 { 2799 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2800 seq_printf(seq, 2801 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2802 NIP6(ifp->addr), 2803 ifp->idev->dev->ifindex, 2804 ifp->prefix_len, 2805 ifp->scope, 2806 ifp->flags, 2807 ifp->idev->dev->name); 2808 return 0; 2809 } 2810 2811 static const struct seq_operations if6_seq_ops = { 2812 .start = if6_seq_start, 2813 .next = if6_seq_next, 2814 .show = if6_seq_show, 2815 .stop = if6_seq_stop, 2816 }; 2817 2818 static int if6_seq_open(struct inode *inode, struct file *file) 2819 { 2820 return seq_open_private(file, &if6_seq_ops, 2821 sizeof(struct if6_iter_state)); 2822 } 2823 2824 static const struct file_operations if6_fops = { 2825 .owner = THIS_MODULE, 2826 .open = if6_seq_open, 2827 .read = seq_read, 2828 .llseek = seq_lseek, 2829 .release = seq_release_private, 2830 }; 2831 2832 int __init if6_proc_init(void) 2833 { 2834 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops)) 2835 return -ENOMEM; 2836 return 0; 2837 } 2838 2839 void if6_proc_exit(void) 2840 { 2841 proc_net_remove(&init_net, "if_inet6"); 2842 } 2843 #endif /* CONFIG_PROC_FS */ 2844 2845 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 2846 /* Check if address is a home address configured on any interface. */ 2847 int ipv6_chk_home_addr(struct in6_addr *addr) 2848 { 2849 int ret = 0; 2850 struct inet6_ifaddr * ifp; 2851 u8 hash = ipv6_addr_hash(addr); 2852 read_lock_bh(&addrconf_hash_lock); 2853 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2854 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 && 2855 (ifp->flags & IFA_F_HOMEADDRESS)) { 2856 ret = 1; 2857 break; 2858 } 2859 } 2860 read_unlock_bh(&addrconf_hash_lock); 2861 return ret; 2862 } 2863 #endif 2864 2865 /* 2866 * Periodic address status verification 2867 */ 2868 2869 static void addrconf_verify(unsigned long foo) 2870 { 2871 struct inet6_ifaddr *ifp; 2872 unsigned long now, next; 2873 int i; 2874 2875 spin_lock_bh(&addrconf_verify_lock); 2876 now = jiffies; 2877 next = now + ADDR_CHECK_FREQUENCY; 2878 2879 del_timer(&addr_chk_timer); 2880 2881 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2882 2883 restart: 2884 read_lock(&addrconf_hash_lock); 2885 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2886 unsigned long age; 2887 #ifdef CONFIG_IPV6_PRIVACY 2888 unsigned long regen_advance; 2889 #endif 2890 2891 if (ifp->flags & IFA_F_PERMANENT) 2892 continue; 2893 2894 spin_lock(&ifp->lock); 2895 age = (now - ifp->tstamp) / HZ; 2896 2897 #ifdef CONFIG_IPV6_PRIVACY 2898 regen_advance = ifp->idev->cnf.regen_max_retry * 2899 ifp->idev->cnf.dad_transmits * 2900 ifp->idev->nd_parms->retrans_time / HZ; 2901 #endif 2902 2903 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2904 age >= ifp->valid_lft) { 2905 spin_unlock(&ifp->lock); 2906 in6_ifa_hold(ifp); 2907 read_unlock(&addrconf_hash_lock); 2908 ipv6_del_addr(ifp); 2909 goto restart; 2910 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2911 spin_unlock(&ifp->lock); 2912 continue; 2913 } else if (age >= ifp->prefered_lft) { 2914 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2915 int deprecate = 0; 2916 2917 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2918 deprecate = 1; 2919 ifp->flags |= IFA_F_DEPRECATED; 2920 } 2921 2922 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2923 next = ifp->tstamp + ifp->valid_lft * HZ; 2924 2925 spin_unlock(&ifp->lock); 2926 2927 if (deprecate) { 2928 in6_ifa_hold(ifp); 2929 read_unlock(&addrconf_hash_lock); 2930 2931 ipv6_ifa_notify(0, ifp); 2932 in6_ifa_put(ifp); 2933 goto restart; 2934 } 2935 #ifdef CONFIG_IPV6_PRIVACY 2936 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2937 !(ifp->flags&IFA_F_TENTATIVE)) { 2938 if (age >= ifp->prefered_lft - regen_advance) { 2939 struct inet6_ifaddr *ifpub = ifp->ifpub; 2940 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2941 next = ifp->tstamp + ifp->prefered_lft * HZ; 2942 if (!ifp->regen_count && ifpub) { 2943 ifp->regen_count++; 2944 in6_ifa_hold(ifp); 2945 in6_ifa_hold(ifpub); 2946 spin_unlock(&ifp->lock); 2947 read_unlock(&addrconf_hash_lock); 2948 spin_lock(&ifpub->lock); 2949 ifpub->regen_count = 0; 2950 spin_unlock(&ifpub->lock); 2951 ipv6_create_tempaddr(ifpub, ifp); 2952 in6_ifa_put(ifpub); 2953 in6_ifa_put(ifp); 2954 goto restart; 2955 } 2956 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2957 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2958 spin_unlock(&ifp->lock); 2959 #endif 2960 } else { 2961 /* ifp->prefered_lft <= ifp->valid_lft */ 2962 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2963 next = ifp->tstamp + ifp->prefered_lft * HZ; 2964 spin_unlock(&ifp->lock); 2965 } 2966 } 2967 read_unlock(&addrconf_hash_lock); 2968 } 2969 2970 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2971 add_timer(&addr_chk_timer); 2972 spin_unlock_bh(&addrconf_verify_lock); 2973 } 2974 2975 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 2976 { 2977 struct in6_addr *pfx = NULL; 2978 2979 if (addr) 2980 pfx = nla_data(addr); 2981 2982 if (local) { 2983 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 2984 pfx = NULL; 2985 else 2986 pfx = nla_data(local); 2987 } 2988 2989 return pfx; 2990 } 2991 2992 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 2993 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 2994 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 2995 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 2996 }; 2997 2998 static int 2999 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3000 { 3001 struct net *net = skb->sk->sk_net; 3002 struct ifaddrmsg *ifm; 3003 struct nlattr *tb[IFA_MAX+1]; 3004 struct in6_addr *pfx; 3005 int err; 3006 3007 if (net != &init_net) 3008 return -EINVAL; 3009 3010 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3011 if (err < 0) 3012 return err; 3013 3014 ifm = nlmsg_data(nlh); 3015 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3016 if (pfx == NULL) 3017 return -EINVAL; 3018 3019 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3020 } 3021 3022 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3023 u32 prefered_lft, u32 valid_lft) 3024 { 3025 u32 flags = RTF_EXPIRES; 3026 3027 if (!valid_lft || (prefered_lft > valid_lft)) 3028 return -EINVAL; 3029 3030 if (valid_lft == INFINITY_LIFE_TIME) { 3031 ifa_flags |= IFA_F_PERMANENT; 3032 flags = 0; 3033 } else if (valid_lft >= 0x7FFFFFFF/HZ) 3034 valid_lft = 0x7FFFFFFF/HZ; 3035 3036 if (prefered_lft == 0) 3037 ifa_flags |= IFA_F_DEPRECATED; 3038 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 3039 (prefered_lft != INFINITY_LIFE_TIME)) 3040 prefered_lft = 0x7FFFFFFF/HZ; 3041 3042 spin_lock_bh(&ifp->lock); 3043 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3044 ifp->tstamp = jiffies; 3045 ifp->valid_lft = valid_lft; 3046 ifp->prefered_lft = prefered_lft; 3047 3048 spin_unlock_bh(&ifp->lock); 3049 if (!(ifp->flags&IFA_F_TENTATIVE)) 3050 ipv6_ifa_notify(0, ifp); 3051 3052 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3053 jiffies_to_clock_t(valid_lft * HZ), flags); 3054 addrconf_verify(0); 3055 3056 return 0; 3057 } 3058 3059 static int 3060 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3061 { 3062 struct net *net = skb->sk->sk_net; 3063 struct ifaddrmsg *ifm; 3064 struct nlattr *tb[IFA_MAX+1]; 3065 struct in6_addr *pfx; 3066 struct inet6_ifaddr *ifa; 3067 struct net_device *dev; 3068 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3069 u8 ifa_flags; 3070 int err; 3071 3072 if (net != &init_net) 3073 return -EINVAL; 3074 3075 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3076 if (err < 0) 3077 return err; 3078 3079 ifm = nlmsg_data(nlh); 3080 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3081 if (pfx == NULL) 3082 return -EINVAL; 3083 3084 if (tb[IFA_CACHEINFO]) { 3085 struct ifa_cacheinfo *ci; 3086 3087 ci = nla_data(tb[IFA_CACHEINFO]); 3088 valid_lft = ci->ifa_valid; 3089 preferred_lft = ci->ifa_prefered; 3090 } else { 3091 preferred_lft = INFINITY_LIFE_TIME; 3092 valid_lft = INFINITY_LIFE_TIME; 3093 } 3094 3095 dev = __dev_get_by_index(&init_net, ifm->ifa_index); 3096 if (dev == NULL) 3097 return -ENODEV; 3098 3099 /* We ignore other flags so far. */ 3100 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3101 3102 ifa = ipv6_get_ifaddr(pfx, dev, 1); 3103 if (ifa == NULL) { 3104 /* 3105 * It would be best to check for !NLM_F_CREATE here but 3106 * userspace alreay relies on not having to provide this. 3107 */ 3108 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 3109 ifa_flags, preferred_lft, valid_lft); 3110 } 3111 3112 if (nlh->nlmsg_flags & NLM_F_EXCL || 3113 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3114 err = -EEXIST; 3115 else 3116 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3117 3118 in6_ifa_put(ifa); 3119 3120 return err; 3121 } 3122 3123 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3124 u8 scope, int ifindex) 3125 { 3126 struct ifaddrmsg *ifm; 3127 3128 ifm = nlmsg_data(nlh); 3129 ifm->ifa_family = AF_INET6; 3130 ifm->ifa_prefixlen = prefixlen; 3131 ifm->ifa_flags = flags; 3132 ifm->ifa_scope = scope; 3133 ifm->ifa_index = ifindex; 3134 } 3135 3136 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3137 unsigned long tstamp, u32 preferred, u32 valid) 3138 { 3139 struct ifa_cacheinfo ci; 3140 3141 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3142 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3143 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3144 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3145 ci.ifa_prefered = preferred; 3146 ci.ifa_valid = valid; 3147 3148 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3149 } 3150 3151 static inline int rt_scope(int ifa_scope) 3152 { 3153 if (ifa_scope & IFA_HOST) 3154 return RT_SCOPE_HOST; 3155 else if (ifa_scope & IFA_LINK) 3156 return RT_SCOPE_LINK; 3157 else if (ifa_scope & IFA_SITE) 3158 return RT_SCOPE_SITE; 3159 else 3160 return RT_SCOPE_UNIVERSE; 3161 } 3162 3163 static inline int inet6_ifaddr_msgsize(void) 3164 { 3165 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3166 + nla_total_size(16) /* IFA_ADDRESS */ 3167 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3168 } 3169 3170 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3171 u32 pid, u32 seq, int event, unsigned int flags) 3172 { 3173 struct nlmsghdr *nlh; 3174 u32 preferred, valid; 3175 3176 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3177 if (nlh == NULL) 3178 return -EMSGSIZE; 3179 3180 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3181 ifa->idev->dev->ifindex); 3182 3183 if (!(ifa->flags&IFA_F_PERMANENT)) { 3184 preferred = ifa->prefered_lft; 3185 valid = ifa->valid_lft; 3186 if (preferred != INFINITY_LIFE_TIME) { 3187 long tval = (jiffies - ifa->tstamp)/HZ; 3188 preferred -= tval; 3189 if (valid != INFINITY_LIFE_TIME) 3190 valid -= tval; 3191 } 3192 } else { 3193 preferred = INFINITY_LIFE_TIME; 3194 valid = INFINITY_LIFE_TIME; 3195 } 3196 3197 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3198 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3199 nlmsg_cancel(skb, nlh); 3200 return -EMSGSIZE; 3201 } 3202 3203 return nlmsg_end(skb, nlh); 3204 } 3205 3206 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3207 u32 pid, u32 seq, int event, u16 flags) 3208 { 3209 struct nlmsghdr *nlh; 3210 u8 scope = RT_SCOPE_UNIVERSE; 3211 int ifindex = ifmca->idev->dev->ifindex; 3212 3213 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3214 scope = RT_SCOPE_SITE; 3215 3216 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3217 if (nlh == NULL) 3218 return -EMSGSIZE; 3219 3220 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3221 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3222 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3223 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3224 nlmsg_cancel(skb, nlh); 3225 return -EMSGSIZE; 3226 } 3227 3228 return nlmsg_end(skb, nlh); 3229 } 3230 3231 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3232 u32 pid, u32 seq, int event, unsigned int flags) 3233 { 3234 struct nlmsghdr *nlh; 3235 u8 scope = RT_SCOPE_UNIVERSE; 3236 int ifindex = ifaca->aca_idev->dev->ifindex; 3237 3238 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3239 scope = RT_SCOPE_SITE; 3240 3241 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3242 if (nlh == NULL) 3243 return -EMSGSIZE; 3244 3245 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3246 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3247 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3248 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3249 nlmsg_cancel(skb, nlh); 3250 return -EMSGSIZE; 3251 } 3252 3253 return nlmsg_end(skb, nlh); 3254 } 3255 3256 enum addr_type_t 3257 { 3258 UNICAST_ADDR, 3259 MULTICAST_ADDR, 3260 ANYCAST_ADDR, 3261 }; 3262 3263 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3264 enum addr_type_t type) 3265 { 3266 int idx, ip_idx; 3267 int s_idx, s_ip_idx; 3268 int err = 1; 3269 struct net_device *dev; 3270 struct inet6_dev *idev = NULL; 3271 struct inet6_ifaddr *ifa; 3272 struct ifmcaddr6 *ifmca; 3273 struct ifacaddr6 *ifaca; 3274 3275 s_idx = cb->args[0]; 3276 s_ip_idx = ip_idx = cb->args[1]; 3277 3278 idx = 0; 3279 for_each_netdev(&init_net, dev) { 3280 if (idx < s_idx) 3281 goto cont; 3282 if (idx > s_idx) 3283 s_ip_idx = 0; 3284 ip_idx = 0; 3285 if ((idev = in6_dev_get(dev)) == NULL) 3286 goto cont; 3287 read_lock_bh(&idev->lock); 3288 switch (type) { 3289 case UNICAST_ADDR: 3290 /* unicast address incl. temp addr */ 3291 for (ifa = idev->addr_list; ifa; 3292 ifa = ifa->if_next, ip_idx++) { 3293 if (ip_idx < s_ip_idx) 3294 continue; 3295 if ((err = inet6_fill_ifaddr(skb, ifa, 3296 NETLINK_CB(cb->skb).pid, 3297 cb->nlh->nlmsg_seq, RTM_NEWADDR, 3298 NLM_F_MULTI)) <= 0) 3299 goto done; 3300 } 3301 break; 3302 case MULTICAST_ADDR: 3303 /* multicast address */ 3304 for (ifmca = idev->mc_list; ifmca; 3305 ifmca = ifmca->next, ip_idx++) { 3306 if (ip_idx < s_ip_idx) 3307 continue; 3308 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 3309 NETLINK_CB(cb->skb).pid, 3310 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 3311 NLM_F_MULTI)) <= 0) 3312 goto done; 3313 } 3314 break; 3315 case ANYCAST_ADDR: 3316 /* anycast address */ 3317 for (ifaca = idev->ac_list; ifaca; 3318 ifaca = ifaca->aca_next, ip_idx++) { 3319 if (ip_idx < s_ip_idx) 3320 continue; 3321 if ((err = inet6_fill_ifacaddr(skb, ifaca, 3322 NETLINK_CB(cb->skb).pid, 3323 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 3324 NLM_F_MULTI)) <= 0) 3325 goto done; 3326 } 3327 break; 3328 default: 3329 break; 3330 } 3331 read_unlock_bh(&idev->lock); 3332 in6_dev_put(idev); 3333 cont: 3334 idx++; 3335 } 3336 done: 3337 if (err <= 0) { 3338 read_unlock_bh(&idev->lock); 3339 in6_dev_put(idev); 3340 } 3341 cb->args[0] = idx; 3342 cb->args[1] = ip_idx; 3343 return skb->len; 3344 } 3345 3346 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3347 { 3348 struct net *net = skb->sk->sk_net; 3349 enum addr_type_t type = UNICAST_ADDR; 3350 3351 if (net != &init_net) 3352 return 0; 3353 3354 return inet6_dump_addr(skb, cb, type); 3355 } 3356 3357 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3358 { 3359 struct net *net = skb->sk->sk_net; 3360 enum addr_type_t type = MULTICAST_ADDR; 3361 3362 if (net != &init_net) 3363 return 0; 3364 3365 return inet6_dump_addr(skb, cb, type); 3366 } 3367 3368 3369 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3370 { 3371 struct net *net = skb->sk->sk_net; 3372 enum addr_type_t type = ANYCAST_ADDR; 3373 3374 if (net != &init_net) 3375 return 0; 3376 3377 return inet6_dump_addr(skb, cb, type); 3378 } 3379 3380 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3381 void *arg) 3382 { 3383 struct net *net = in_skb->sk->sk_net; 3384 struct ifaddrmsg *ifm; 3385 struct nlattr *tb[IFA_MAX+1]; 3386 struct in6_addr *addr = NULL; 3387 struct net_device *dev = NULL; 3388 struct inet6_ifaddr *ifa; 3389 struct sk_buff *skb; 3390 int err; 3391 3392 if (net != &init_net) 3393 return -EINVAL; 3394 3395 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3396 if (err < 0) 3397 goto errout; 3398 3399 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3400 if (addr == NULL) { 3401 err = -EINVAL; 3402 goto errout; 3403 } 3404 3405 ifm = nlmsg_data(nlh); 3406 if (ifm->ifa_index) 3407 dev = __dev_get_by_index(&init_net, ifm->ifa_index); 3408 3409 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) { 3410 err = -EADDRNOTAVAIL; 3411 goto errout; 3412 } 3413 3414 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3415 err = -ENOBUFS; 3416 goto errout_ifa; 3417 } 3418 3419 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3420 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3421 if (err < 0) { 3422 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3423 WARN_ON(err == -EMSGSIZE); 3424 kfree_skb(skb); 3425 goto errout_ifa; 3426 } 3427 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); 3428 errout_ifa: 3429 in6_ifa_put(ifa); 3430 errout: 3431 return err; 3432 } 3433 3434 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3435 { 3436 struct sk_buff *skb; 3437 int err = -ENOBUFS; 3438 3439 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3440 if (skb == NULL) 3441 goto errout; 3442 3443 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3444 if (err < 0) { 3445 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3446 WARN_ON(err == -EMSGSIZE); 3447 kfree_skb(skb); 3448 goto errout; 3449 } 3450 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3451 errout: 3452 if (err < 0) 3453 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err); 3454 } 3455 3456 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3457 __s32 *array, int bytes) 3458 { 3459 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3460 3461 memset(array, 0, bytes); 3462 array[DEVCONF_FORWARDING] = cnf->forwarding; 3463 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3464 array[DEVCONF_MTU6] = cnf->mtu6; 3465 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3466 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3467 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3468 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3469 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3470 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3471 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3472 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3473 #ifdef CONFIG_IPV6_PRIVACY 3474 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3475 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3476 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3477 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3478 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3479 #endif 3480 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3481 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3482 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3483 #ifdef CONFIG_IPV6_ROUTER_PREF 3484 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3485 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3486 #ifdef CONFIG_IPV6_ROUTE_INFO 3487 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3488 #endif 3489 #endif 3490 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3491 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3492 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3493 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3494 #endif 3495 } 3496 3497 static inline size_t inet6_if_nlmsg_size(void) 3498 { 3499 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3500 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3501 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3502 + nla_total_size(4) /* IFLA_MTU */ 3503 + nla_total_size(4) /* IFLA_LINK */ 3504 + nla_total_size( /* IFLA_PROTINFO */ 3505 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3506 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3507 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3508 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3509 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3510 ); 3511 } 3512 3513 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3514 int bytes) 3515 { 3516 int i; 3517 int pad = bytes - sizeof(u64) * items; 3518 BUG_ON(pad < 0); 3519 3520 /* Use put_unaligned() because stats may not be aligned for u64. */ 3521 put_unaligned(items, &stats[0]); 3522 for (i = 1; i < items; i++) 3523 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3524 3525 memset(&stats[items], 0, pad); 3526 } 3527 3528 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3529 int bytes) 3530 { 3531 switch(attrtype) { 3532 case IFLA_INET6_STATS: 3533 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3534 break; 3535 case IFLA_INET6_ICMP6STATS: 3536 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3537 break; 3538 } 3539 } 3540 3541 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3542 u32 pid, u32 seq, int event, unsigned int flags) 3543 { 3544 struct net_device *dev = idev->dev; 3545 struct nlattr *nla; 3546 struct ifinfomsg *hdr; 3547 struct nlmsghdr *nlh; 3548 void *protoinfo; 3549 struct ifla_cacheinfo ci; 3550 3551 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3552 if (nlh == NULL) 3553 return -EMSGSIZE; 3554 3555 hdr = nlmsg_data(nlh); 3556 hdr->ifi_family = AF_INET6; 3557 hdr->__ifi_pad = 0; 3558 hdr->ifi_type = dev->type; 3559 hdr->ifi_index = dev->ifindex; 3560 hdr->ifi_flags = dev_get_flags(dev); 3561 hdr->ifi_change = 0; 3562 3563 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3564 3565 if (dev->addr_len) 3566 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3567 3568 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3569 if (dev->ifindex != dev->iflink) 3570 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3571 3572 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3573 if (protoinfo == NULL) 3574 goto nla_put_failure; 3575 3576 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3577 3578 ci.max_reasm_len = IPV6_MAXPLEN; 3579 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3580 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3581 ci.reachable_time = idev->nd_parms->reachable_time; 3582 ci.retrans_time = idev->nd_parms->retrans_time; 3583 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3584 3585 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3586 if (nla == NULL) 3587 goto nla_put_failure; 3588 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3589 3590 /* XXX - MC not implemented */ 3591 3592 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3593 if (nla == NULL) 3594 goto nla_put_failure; 3595 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3596 3597 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3598 if (nla == NULL) 3599 goto nla_put_failure; 3600 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3601 3602 nla_nest_end(skb, protoinfo); 3603 return nlmsg_end(skb, nlh); 3604 3605 nla_put_failure: 3606 nlmsg_cancel(skb, nlh); 3607 return -EMSGSIZE; 3608 } 3609 3610 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3611 { 3612 struct net *net = skb->sk->sk_net; 3613 int idx, err; 3614 int s_idx = cb->args[0]; 3615 struct net_device *dev; 3616 struct inet6_dev *idev; 3617 3618 if (net != &init_net) 3619 return 0; 3620 3621 read_lock(&dev_base_lock); 3622 idx = 0; 3623 for_each_netdev(&init_net, dev) { 3624 if (idx < s_idx) 3625 goto cont; 3626 if ((idev = in6_dev_get(dev)) == NULL) 3627 goto cont; 3628 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3629 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3630 in6_dev_put(idev); 3631 if (err <= 0) 3632 break; 3633 cont: 3634 idx++; 3635 } 3636 read_unlock(&dev_base_lock); 3637 cb->args[0] = idx; 3638 3639 return skb->len; 3640 } 3641 3642 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3643 { 3644 struct sk_buff *skb; 3645 int err = -ENOBUFS; 3646 3647 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3648 if (skb == NULL) 3649 goto errout; 3650 3651 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3652 if (err < 0) { 3653 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3654 WARN_ON(err == -EMSGSIZE); 3655 kfree_skb(skb); 3656 goto errout; 3657 } 3658 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3659 errout: 3660 if (err < 0) 3661 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err); 3662 } 3663 3664 static inline size_t inet6_prefix_nlmsg_size(void) 3665 { 3666 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3667 + nla_total_size(sizeof(struct in6_addr)) 3668 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3669 } 3670 3671 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3672 struct prefix_info *pinfo, u32 pid, u32 seq, 3673 int event, unsigned int flags) 3674 { 3675 struct prefixmsg *pmsg; 3676 struct nlmsghdr *nlh; 3677 struct prefix_cacheinfo ci; 3678 3679 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3680 if (nlh == NULL) 3681 return -EMSGSIZE; 3682 3683 pmsg = nlmsg_data(nlh); 3684 pmsg->prefix_family = AF_INET6; 3685 pmsg->prefix_pad1 = 0; 3686 pmsg->prefix_pad2 = 0; 3687 pmsg->prefix_ifindex = idev->dev->ifindex; 3688 pmsg->prefix_len = pinfo->prefix_len; 3689 pmsg->prefix_type = pinfo->type; 3690 pmsg->prefix_pad3 = 0; 3691 pmsg->prefix_flags = 0; 3692 if (pinfo->onlink) 3693 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3694 if (pinfo->autoconf) 3695 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3696 3697 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3698 3699 ci.preferred_time = ntohl(pinfo->prefered); 3700 ci.valid_time = ntohl(pinfo->valid); 3701 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3702 3703 return nlmsg_end(skb, nlh); 3704 3705 nla_put_failure: 3706 nlmsg_cancel(skb, nlh); 3707 return -EMSGSIZE; 3708 } 3709 3710 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3711 struct prefix_info *pinfo) 3712 { 3713 struct sk_buff *skb; 3714 int err = -ENOBUFS; 3715 3716 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3717 if (skb == NULL) 3718 goto errout; 3719 3720 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3721 if (err < 0) { 3722 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3723 WARN_ON(err == -EMSGSIZE); 3724 kfree_skb(skb); 3725 goto errout; 3726 } 3727 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3728 errout: 3729 if (err < 0) 3730 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err); 3731 } 3732 3733 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3734 { 3735 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3736 3737 switch (event) { 3738 case RTM_NEWADDR: 3739 /* 3740 * If the address was optimistic 3741 * we inserted the route at the start of 3742 * our DAD process, so we don't need 3743 * to do it again 3744 */ 3745 if (!(ifp->rt->rt6i_node)) 3746 ip6_ins_rt(ifp->rt); 3747 if (ifp->idev->cnf.forwarding) 3748 addrconf_join_anycast(ifp); 3749 break; 3750 case RTM_DELADDR: 3751 if (ifp->idev->cnf.forwarding) 3752 addrconf_leave_anycast(ifp); 3753 addrconf_leave_solict(ifp->idev, &ifp->addr); 3754 dst_hold(&ifp->rt->u.dst); 3755 if (ip6_del_rt(ifp->rt)) 3756 dst_free(&ifp->rt->u.dst); 3757 break; 3758 } 3759 } 3760 3761 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3762 { 3763 rcu_read_lock_bh(); 3764 if (likely(ifp->idev->dead == 0)) 3765 __ipv6_ifa_notify(event, ifp); 3766 rcu_read_unlock_bh(); 3767 } 3768 3769 #ifdef CONFIG_SYSCTL 3770 3771 static 3772 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3773 void __user *buffer, size_t *lenp, loff_t *ppos) 3774 { 3775 int *valp = ctl->data; 3776 int val = *valp; 3777 int ret; 3778 3779 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3780 3781 if (write) 3782 addrconf_fixup_forwarding(ctl, valp, val); 3783 return ret; 3784 } 3785 3786 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3787 int __user *name, int nlen, 3788 void __user *oldval, 3789 size_t __user *oldlenp, 3790 void __user *newval, size_t newlen) 3791 { 3792 int *valp = table->data; 3793 int val = *valp; 3794 int new; 3795 3796 if (!newval || !newlen) 3797 return 0; 3798 if (newlen != sizeof(int)) 3799 return -EINVAL; 3800 if (get_user(new, (int __user *)newval)) 3801 return -EFAULT; 3802 if (new == *valp) 3803 return 0; 3804 if (oldval && oldlenp) { 3805 size_t len; 3806 if (get_user(len, oldlenp)) 3807 return -EFAULT; 3808 if (len) { 3809 if (len > table->maxlen) 3810 len = table->maxlen; 3811 if (copy_to_user(oldval, valp, len)) 3812 return -EFAULT; 3813 if (put_user(len, oldlenp)) 3814 return -EFAULT; 3815 } 3816 } 3817 3818 *valp = new; 3819 addrconf_fixup_forwarding(table, valp, val); 3820 return 1; 3821 } 3822 3823 static struct addrconf_sysctl_table 3824 { 3825 struct ctl_table_header *sysctl_header; 3826 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3827 char *dev_name; 3828 } addrconf_sysctl __read_mostly = { 3829 .sysctl_header = NULL, 3830 .addrconf_vars = { 3831 { 3832 .ctl_name = NET_IPV6_FORWARDING, 3833 .procname = "forwarding", 3834 .data = &ipv6_devconf.forwarding, 3835 .maxlen = sizeof(int), 3836 .mode = 0644, 3837 .proc_handler = &addrconf_sysctl_forward, 3838 .strategy = &addrconf_sysctl_forward_strategy, 3839 }, 3840 { 3841 .ctl_name = NET_IPV6_HOP_LIMIT, 3842 .procname = "hop_limit", 3843 .data = &ipv6_devconf.hop_limit, 3844 .maxlen = sizeof(int), 3845 .mode = 0644, 3846 .proc_handler = proc_dointvec, 3847 }, 3848 { 3849 .ctl_name = NET_IPV6_MTU, 3850 .procname = "mtu", 3851 .data = &ipv6_devconf.mtu6, 3852 .maxlen = sizeof(int), 3853 .mode = 0644, 3854 .proc_handler = &proc_dointvec, 3855 }, 3856 { 3857 .ctl_name = NET_IPV6_ACCEPT_RA, 3858 .procname = "accept_ra", 3859 .data = &ipv6_devconf.accept_ra, 3860 .maxlen = sizeof(int), 3861 .mode = 0644, 3862 .proc_handler = &proc_dointvec, 3863 }, 3864 { 3865 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3866 .procname = "accept_redirects", 3867 .data = &ipv6_devconf.accept_redirects, 3868 .maxlen = sizeof(int), 3869 .mode = 0644, 3870 .proc_handler = &proc_dointvec, 3871 }, 3872 { 3873 .ctl_name = NET_IPV6_AUTOCONF, 3874 .procname = "autoconf", 3875 .data = &ipv6_devconf.autoconf, 3876 .maxlen = sizeof(int), 3877 .mode = 0644, 3878 .proc_handler = &proc_dointvec, 3879 }, 3880 { 3881 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3882 .procname = "dad_transmits", 3883 .data = &ipv6_devconf.dad_transmits, 3884 .maxlen = sizeof(int), 3885 .mode = 0644, 3886 .proc_handler = &proc_dointvec, 3887 }, 3888 { 3889 .ctl_name = NET_IPV6_RTR_SOLICITS, 3890 .procname = "router_solicitations", 3891 .data = &ipv6_devconf.rtr_solicits, 3892 .maxlen = sizeof(int), 3893 .mode = 0644, 3894 .proc_handler = &proc_dointvec, 3895 }, 3896 { 3897 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3898 .procname = "router_solicitation_interval", 3899 .data = &ipv6_devconf.rtr_solicit_interval, 3900 .maxlen = sizeof(int), 3901 .mode = 0644, 3902 .proc_handler = &proc_dointvec_jiffies, 3903 .strategy = &sysctl_jiffies, 3904 }, 3905 { 3906 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3907 .procname = "router_solicitation_delay", 3908 .data = &ipv6_devconf.rtr_solicit_delay, 3909 .maxlen = sizeof(int), 3910 .mode = 0644, 3911 .proc_handler = &proc_dointvec_jiffies, 3912 .strategy = &sysctl_jiffies, 3913 }, 3914 { 3915 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3916 .procname = "force_mld_version", 3917 .data = &ipv6_devconf.force_mld_version, 3918 .maxlen = sizeof(int), 3919 .mode = 0644, 3920 .proc_handler = &proc_dointvec, 3921 }, 3922 #ifdef CONFIG_IPV6_PRIVACY 3923 { 3924 .ctl_name = NET_IPV6_USE_TEMPADDR, 3925 .procname = "use_tempaddr", 3926 .data = &ipv6_devconf.use_tempaddr, 3927 .maxlen = sizeof(int), 3928 .mode = 0644, 3929 .proc_handler = &proc_dointvec, 3930 }, 3931 { 3932 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3933 .procname = "temp_valid_lft", 3934 .data = &ipv6_devconf.temp_valid_lft, 3935 .maxlen = sizeof(int), 3936 .mode = 0644, 3937 .proc_handler = &proc_dointvec, 3938 }, 3939 { 3940 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3941 .procname = "temp_prefered_lft", 3942 .data = &ipv6_devconf.temp_prefered_lft, 3943 .maxlen = sizeof(int), 3944 .mode = 0644, 3945 .proc_handler = &proc_dointvec, 3946 }, 3947 { 3948 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3949 .procname = "regen_max_retry", 3950 .data = &ipv6_devconf.regen_max_retry, 3951 .maxlen = sizeof(int), 3952 .mode = 0644, 3953 .proc_handler = &proc_dointvec, 3954 }, 3955 { 3956 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3957 .procname = "max_desync_factor", 3958 .data = &ipv6_devconf.max_desync_factor, 3959 .maxlen = sizeof(int), 3960 .mode = 0644, 3961 .proc_handler = &proc_dointvec, 3962 }, 3963 #endif 3964 { 3965 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3966 .procname = "max_addresses", 3967 .data = &ipv6_devconf.max_addresses, 3968 .maxlen = sizeof(int), 3969 .mode = 0644, 3970 .proc_handler = &proc_dointvec, 3971 }, 3972 { 3973 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 3974 .procname = "accept_ra_defrtr", 3975 .data = &ipv6_devconf.accept_ra_defrtr, 3976 .maxlen = sizeof(int), 3977 .mode = 0644, 3978 .proc_handler = &proc_dointvec, 3979 }, 3980 { 3981 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 3982 .procname = "accept_ra_pinfo", 3983 .data = &ipv6_devconf.accept_ra_pinfo, 3984 .maxlen = sizeof(int), 3985 .mode = 0644, 3986 .proc_handler = &proc_dointvec, 3987 }, 3988 #ifdef CONFIG_IPV6_ROUTER_PREF 3989 { 3990 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 3991 .procname = "accept_ra_rtr_pref", 3992 .data = &ipv6_devconf.accept_ra_rtr_pref, 3993 .maxlen = sizeof(int), 3994 .mode = 0644, 3995 .proc_handler = &proc_dointvec, 3996 }, 3997 { 3998 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 3999 .procname = "router_probe_interval", 4000 .data = &ipv6_devconf.rtr_probe_interval, 4001 .maxlen = sizeof(int), 4002 .mode = 0644, 4003 .proc_handler = &proc_dointvec_jiffies, 4004 .strategy = &sysctl_jiffies, 4005 }, 4006 #ifdef CONFIG_IPV6_ROUTE_INFO 4007 { 4008 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4009 .procname = "accept_ra_rt_info_max_plen", 4010 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4011 .maxlen = sizeof(int), 4012 .mode = 0644, 4013 .proc_handler = &proc_dointvec, 4014 }, 4015 #endif 4016 #endif 4017 { 4018 .ctl_name = NET_IPV6_PROXY_NDP, 4019 .procname = "proxy_ndp", 4020 .data = &ipv6_devconf.proxy_ndp, 4021 .maxlen = sizeof(int), 4022 .mode = 0644, 4023 .proc_handler = &proc_dointvec, 4024 }, 4025 { 4026 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4027 .procname = "accept_source_route", 4028 .data = &ipv6_devconf.accept_source_route, 4029 .maxlen = sizeof(int), 4030 .mode = 0644, 4031 .proc_handler = &proc_dointvec, 4032 }, 4033 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4034 { 4035 .ctl_name = CTL_UNNUMBERED, 4036 .procname = "optimistic_dad", 4037 .data = &ipv6_devconf.optimistic_dad, 4038 .maxlen = sizeof(int), 4039 .mode = 0644, 4040 .proc_handler = &proc_dointvec, 4041 4042 }, 4043 #endif 4044 { 4045 .ctl_name = 0, /* sentinel */ 4046 } 4047 }, 4048 }; 4049 4050 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4051 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4052 { 4053 int i; 4054 struct addrconf_sysctl_table *t; 4055 4056 #define ADDRCONF_CTL_PATH_DEV 3 4057 4058 struct ctl_path addrconf_ctl_path[] = { 4059 { .procname = "net", .ctl_name = CTL_NET, }, 4060 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4061 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4062 { /* to be set */ }, 4063 { }, 4064 }; 4065 4066 4067 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4068 if (t == NULL) 4069 goto out; 4070 4071 for (i=0; t->addrconf_vars[i].data; i++) { 4072 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4073 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4074 t->addrconf_vars[i].extra2 = net; 4075 } 4076 4077 /* 4078 * Make a copy of dev_name, because '.procname' is regarded as const 4079 * by sysctl and we wouldn't want anyone to change it under our feet 4080 * (see SIOCSIFNAME). 4081 */ 4082 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4083 if (!t->dev_name) 4084 goto free; 4085 4086 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4087 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4088 4089 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4090 t->addrconf_vars); 4091 if (t->sysctl_header == NULL) 4092 goto free_procname; 4093 4094 p->sysctl = t; 4095 return 0; 4096 4097 free_procname: 4098 kfree(t->dev_name); 4099 free: 4100 kfree(t); 4101 out: 4102 return -ENOBUFS; 4103 } 4104 4105 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4106 { 4107 struct addrconf_sysctl_table *t; 4108 4109 if (p->sysctl == NULL) 4110 return; 4111 4112 t = p->sysctl; 4113 p->sysctl = NULL; 4114 unregister_sysctl_table(t->sysctl_header); 4115 kfree(t->dev_name); 4116 kfree(t); 4117 } 4118 4119 static void addrconf_sysctl_register(struct inet6_dev *idev) 4120 { 4121 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4122 NET_IPV6_NEIGH, "ipv6", 4123 &ndisc_ifinfo_sysctl_change, 4124 NULL); 4125 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name, 4126 idev->dev->ifindex, idev, &idev->cnf); 4127 } 4128 4129 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4130 { 4131 __addrconf_sysctl_unregister(&idev->cnf); 4132 neigh_sysctl_unregister(idev->nd_parms); 4133 } 4134 4135 4136 #endif 4137 4138 static int addrconf_init_net(struct net *net) 4139 { 4140 int err; 4141 struct ipv6_devconf *all, *dflt; 4142 4143 err = -ENOMEM; 4144 all = &ipv6_devconf; 4145 dflt = &ipv6_devconf_dflt; 4146 4147 if (net != &init_net) { 4148 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4149 if (all == NULL) 4150 goto err_alloc_all; 4151 4152 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4153 if (dflt == NULL) 4154 goto err_alloc_dflt; 4155 } 4156 4157 net->ipv6.devconf_all = all; 4158 net->ipv6.devconf_dflt = dflt; 4159 4160 #ifdef CONFIG_SYSCTL 4161 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4162 NULL, all); 4163 if (err < 0) 4164 goto err_reg_all; 4165 4166 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4167 NULL, dflt); 4168 if (err < 0) 4169 goto err_reg_dflt; 4170 #endif 4171 return 0; 4172 4173 #ifdef CONFIG_SYSCTL 4174 err_reg_dflt: 4175 __addrconf_sysctl_unregister(all); 4176 err_reg_all: 4177 kfree(dflt); 4178 #endif 4179 err_alloc_dflt: 4180 kfree(all); 4181 err_alloc_all: 4182 return err; 4183 } 4184 4185 static void addrconf_exit_net(struct net *net) 4186 { 4187 #ifdef CONFIG_SYSCTL 4188 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4189 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4190 #endif 4191 if (net != &init_net) { 4192 kfree(net->ipv6.devconf_dflt); 4193 kfree(net->ipv6.devconf_all); 4194 } 4195 } 4196 4197 static struct pernet_operations addrconf_ops = { 4198 .init = addrconf_init_net, 4199 .exit = addrconf_exit_net, 4200 }; 4201 4202 /* 4203 * Device notifier 4204 */ 4205 4206 int register_inet6addr_notifier(struct notifier_block *nb) 4207 { 4208 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4209 } 4210 4211 EXPORT_SYMBOL(register_inet6addr_notifier); 4212 4213 int unregister_inet6addr_notifier(struct notifier_block *nb) 4214 { 4215 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4216 } 4217 4218 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4219 4220 /* 4221 * Init / cleanup code 4222 */ 4223 4224 int __init addrconf_init(void) 4225 { 4226 int err; 4227 4228 if ((err = ipv6_addr_label_init()) < 0) { 4229 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4230 err); 4231 return err; 4232 } 4233 4234 register_pernet_subsys(&addrconf_ops); 4235 4236 /* The addrconf netdev notifier requires that loopback_dev 4237 * has it's ipv6 private information allocated and setup 4238 * before it can bring up and give link-local addresses 4239 * to other devices which are up. 4240 * 4241 * Unfortunately, loopback_dev is not necessarily the first 4242 * entry in the global dev_base list of net devices. In fact, 4243 * it is likely to be the very last entry on that list. 4244 * So this causes the notifier registry below to try and 4245 * give link-local addresses to all devices besides loopback_dev 4246 * first, then loopback_dev, which cases all the non-loopback_dev 4247 * devices to fail to get a link-local address. 4248 * 4249 * So, as a temporary fix, allocate the ipv6 structure for 4250 * loopback_dev first by hand. 4251 * Longer term, all of the dependencies ipv6 has upon the loopback 4252 * device and it being up should be removed. 4253 */ 4254 rtnl_lock(); 4255 if (!ipv6_add_dev(init_net.loopback_dev)) 4256 err = -ENOMEM; 4257 rtnl_unlock(); 4258 if (err) 4259 goto errlo; 4260 4261 ip6_null_entry.u.dst.dev = init_net.loopback_dev; 4262 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev); 4263 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 4264 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev; 4265 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev); 4266 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev; 4267 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev); 4268 #endif 4269 4270 register_netdevice_notifier(&ipv6_dev_notf); 4271 4272 addrconf_verify(0); 4273 4274 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4275 if (err < 0) 4276 goto errout; 4277 4278 /* Only the first call to __rtnl_register can fail */ 4279 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4280 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4281 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4282 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4283 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4284 4285 ipv6_addr_label_rtnl_register(); 4286 4287 return 0; 4288 errout: 4289 unregister_netdevice_notifier(&ipv6_dev_notf); 4290 errlo: 4291 unregister_pernet_subsys(&addrconf_ops); 4292 4293 return err; 4294 } 4295 4296 void addrconf_cleanup(void) 4297 { 4298 struct net_device *dev; 4299 struct inet6_ifaddr *ifa; 4300 int i; 4301 4302 unregister_netdevice_notifier(&ipv6_dev_notf); 4303 4304 unregister_pernet_subsys(&addrconf_ops); 4305 4306 rtnl_lock(); 4307 4308 /* 4309 * clean dev list. 4310 */ 4311 4312 for_each_netdev(&init_net, dev) { 4313 if (__in6_dev_get(dev) == NULL) 4314 continue; 4315 addrconf_ifdown(dev, 1); 4316 } 4317 addrconf_ifdown(init_net.loopback_dev, 2); 4318 4319 /* 4320 * Check hash table. 4321 */ 4322 4323 write_lock_bh(&addrconf_hash_lock); 4324 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4325 for (ifa=inet6_addr_lst[i]; ifa; ) { 4326 struct inet6_ifaddr *bifa; 4327 4328 bifa = ifa; 4329 ifa = ifa->lst_next; 4330 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4331 /* Do not free it; something is wrong. 4332 Now we can investigate it with debugger. 4333 */ 4334 } 4335 } 4336 write_unlock_bh(&addrconf_hash_lock); 4337 4338 del_timer(&addr_chk_timer); 4339 4340 rtnl_unlock(); 4341 } 4342