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/sock.h> 66 #include <net/snmp.h> 67 68 #include <net/ipv6.h> 69 #include <net/protocol.h> 70 #include <net/ndisc.h> 71 #include <net/ip6_route.h> 72 #include <net/addrconf.h> 73 #include <net/tcp.h> 74 #include <net/ip.h> 75 #include <net/netlink.h> 76 #include <linux/if_tunnel.h> 77 #include <linux/rtnetlink.h> 78 79 #ifdef CONFIG_IPV6_PRIVACY 80 #include <linux/random.h> 81 #endif 82 83 #include <asm/uaccess.h> 84 85 #include <linux/proc_fs.h> 86 #include <linux/seq_file.h> 87 88 /* Set to 3 to get tracing... */ 89 #define ACONF_DEBUG 2 90 91 #if ACONF_DEBUG >= 3 92 #define ADBG(x) printk x 93 #else 94 #define ADBG(x) 95 #endif 96 97 #define INFINITY_LIFE_TIME 0xFFFFFFFF 98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 99 100 #ifdef CONFIG_SYSCTL 101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p); 102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p); 103 #endif 104 105 #ifdef CONFIG_IPV6_PRIVACY 106 static int __ipv6_regen_rndid(struct inet6_dev *idev); 107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 108 static void ipv6_regen_rndid(unsigned long data); 109 110 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 111 #endif 112 113 static int ipv6_count_addresses(struct inet6_dev *idev); 114 115 /* 116 * Configured unicast address hash table 117 */ 118 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 119 static DEFINE_RWLOCK(addrconf_hash_lock); 120 121 static void addrconf_verify(unsigned long); 122 123 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 124 static DEFINE_SPINLOCK(addrconf_verify_lock); 125 126 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 128 129 static int addrconf_ifdown(struct net_device *dev, int how); 130 131 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 132 static void addrconf_dad_timer(unsigned long data); 133 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 134 static void addrconf_dad_run(struct inet6_dev *idev); 135 static void addrconf_rs_timer(unsigned long data); 136 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 137 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 138 139 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 140 struct prefix_info *pinfo); 141 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); 142 143 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 144 145 struct ipv6_devconf ipv6_devconf __read_mostly = { 146 .forwarding = 0, 147 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 148 .mtu6 = IPV6_MIN_MTU, 149 .accept_ra = 1, 150 .accept_redirects = 1, 151 .autoconf = 1, 152 .force_mld_version = 0, 153 .dad_transmits = 1, 154 .rtr_solicits = MAX_RTR_SOLICITATIONS, 155 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 156 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 157 #ifdef CONFIG_IPV6_PRIVACY 158 .use_tempaddr = 0, 159 .temp_valid_lft = TEMP_VALID_LIFETIME, 160 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 161 .regen_max_retry = REGEN_MAX_RETRY, 162 .max_desync_factor = MAX_DESYNC_FACTOR, 163 #endif 164 .max_addresses = IPV6_MAX_ADDRESSES, 165 .accept_ra_defrtr = 1, 166 .accept_ra_pinfo = 1, 167 #ifdef CONFIG_IPV6_ROUTER_PREF 168 .accept_ra_rtr_pref = 1, 169 .rtr_probe_interval = 60 * HZ, 170 #ifdef CONFIG_IPV6_ROUTE_INFO 171 .accept_ra_rt_info_max_plen = 0, 172 #endif 173 #endif 174 .proxy_ndp = 0, 175 .accept_source_route = 0, /* we do not accept RH0 by default. */ 176 }; 177 178 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 179 .forwarding = 0, 180 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 181 .mtu6 = IPV6_MIN_MTU, 182 .accept_ra = 1, 183 .accept_redirects = 1, 184 .autoconf = 1, 185 .dad_transmits = 1, 186 .rtr_solicits = MAX_RTR_SOLICITATIONS, 187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 189 #ifdef CONFIG_IPV6_PRIVACY 190 .use_tempaddr = 0, 191 .temp_valid_lft = TEMP_VALID_LIFETIME, 192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 193 .regen_max_retry = REGEN_MAX_RETRY, 194 .max_desync_factor = MAX_DESYNC_FACTOR, 195 #endif 196 .max_addresses = IPV6_MAX_ADDRESSES, 197 .accept_ra_defrtr = 1, 198 .accept_ra_pinfo = 1, 199 #ifdef CONFIG_IPV6_ROUTER_PREF 200 .accept_ra_rtr_pref = 1, 201 .rtr_probe_interval = 60 * HZ, 202 #ifdef CONFIG_IPV6_ROUTE_INFO 203 .accept_ra_rt_info_max_plen = 0, 204 #endif 205 #endif 206 .proxy_ndp = 0, 207 .accept_source_route = 0, /* we do not accept RH0 by default. */ 208 }; 209 210 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 211 #if 0 212 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 213 #endif 214 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 215 216 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 217 { 218 if (del_timer(&ifp->timer)) 219 __in6_ifa_put(ifp); 220 } 221 222 enum addrconf_timer_t 223 { 224 AC_NONE, 225 AC_DAD, 226 AC_RS, 227 }; 228 229 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 230 enum addrconf_timer_t what, 231 unsigned long when) 232 { 233 if (!del_timer(&ifp->timer)) 234 in6_ifa_hold(ifp); 235 236 switch (what) { 237 case AC_DAD: 238 ifp->timer.function = addrconf_dad_timer; 239 break; 240 case AC_RS: 241 ifp->timer.function = addrconf_rs_timer; 242 break; 243 default:; 244 } 245 ifp->timer.expires = jiffies + when; 246 add_timer(&ifp->timer); 247 } 248 249 /* Nobody refers to this device, we may destroy it. */ 250 251 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 252 { 253 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 254 kfree(idev); 255 } 256 257 void in6_dev_finish_destroy(struct inet6_dev *idev) 258 { 259 struct net_device *dev = idev->dev; 260 BUG_TRAP(idev->addr_list==NULL); 261 BUG_TRAP(idev->mc_list==NULL); 262 #ifdef NET_REFCNT_DEBUG 263 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 264 #endif 265 dev_put(dev); 266 if (!idev->dead) { 267 printk("Freeing alive inet6 device %p\n", idev); 268 return; 269 } 270 snmp6_free_dev(idev); 271 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 272 } 273 274 EXPORT_SYMBOL(in6_dev_finish_destroy); 275 276 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 277 { 278 struct inet6_dev *ndev; 279 struct in6_addr maddr; 280 281 ASSERT_RTNL(); 282 283 if (dev->mtu < IPV6_MIN_MTU) 284 return NULL; 285 286 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 287 288 if (ndev == NULL) 289 return NULL; 290 291 rwlock_init(&ndev->lock); 292 ndev->dev = dev; 293 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf)); 294 ndev->cnf.mtu6 = dev->mtu; 295 ndev->cnf.sysctl = NULL; 296 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 297 if (ndev->nd_parms == NULL) { 298 kfree(ndev); 299 return NULL; 300 } 301 /* We refer to the device */ 302 dev_hold(dev); 303 304 if (snmp6_alloc_dev(ndev) < 0) { 305 ADBG((KERN_WARNING 306 "%s(): cannot allocate memory for statistics; dev=%s.\n", 307 __FUNCTION__, dev->name)); 308 neigh_parms_release(&nd_tbl, ndev->nd_parms); 309 ndev->dead = 1; 310 in6_dev_finish_destroy(ndev); 311 return NULL; 312 } 313 314 if (snmp6_register_dev(ndev) < 0) { 315 ADBG((KERN_WARNING 316 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 317 __FUNCTION__, dev->name)); 318 neigh_parms_release(&nd_tbl, ndev->nd_parms); 319 ndev->dead = 1; 320 in6_dev_finish_destroy(ndev); 321 return NULL; 322 } 323 324 /* One reference from device. We must do this before 325 * we invoke __ipv6_regen_rndid(). 326 */ 327 in6_dev_hold(ndev); 328 329 #ifdef CONFIG_IPV6_PRIVACY 330 init_timer(&ndev->regen_timer); 331 ndev->regen_timer.function = ipv6_regen_rndid; 332 ndev->regen_timer.data = (unsigned long) ndev; 333 if ((dev->flags&IFF_LOOPBACK) || 334 dev->type == ARPHRD_TUNNEL || 335 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 336 dev->type == ARPHRD_SIT || 337 #endif 338 dev->type == ARPHRD_NONE) { 339 printk(KERN_INFO 340 "%s: Disabled Privacy Extensions\n", 341 dev->name); 342 ndev->cnf.use_tempaddr = -1; 343 } else { 344 in6_dev_hold(ndev); 345 ipv6_regen_rndid((unsigned long) ndev); 346 } 347 #endif 348 349 if (netif_running(dev) && netif_carrier_ok(dev)) 350 ndev->if_flags |= IF_READY; 351 352 ipv6_mc_init_dev(ndev); 353 ndev->tstamp = jiffies; 354 #ifdef CONFIG_SYSCTL 355 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 356 NET_IPV6_NEIGH, "ipv6", 357 &ndisc_ifinfo_sysctl_change, 358 NULL); 359 addrconf_sysctl_register(ndev, &ndev->cnf); 360 #endif 361 /* protected by rtnl_lock */ 362 rcu_assign_pointer(dev->ip6_ptr, ndev); 363 364 /* Join all-node multicast group */ 365 ipv6_addr_all_nodes(&maddr); 366 ipv6_dev_mc_inc(dev, &maddr); 367 368 return ndev; 369 } 370 371 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 372 { 373 struct inet6_dev *idev; 374 375 ASSERT_RTNL(); 376 377 if ((idev = __in6_dev_get(dev)) == NULL) { 378 if ((idev = ipv6_add_dev(dev)) == NULL) 379 return NULL; 380 } 381 382 if (dev->flags&IFF_UP) 383 ipv6_mc_up(idev); 384 return idev; 385 } 386 387 #ifdef CONFIG_SYSCTL 388 static void dev_forward_change(struct inet6_dev *idev) 389 { 390 struct net_device *dev; 391 struct inet6_ifaddr *ifa; 392 struct in6_addr addr; 393 394 if (!idev) 395 return; 396 dev = idev->dev; 397 if (dev && (dev->flags & IFF_MULTICAST)) { 398 ipv6_addr_all_routers(&addr); 399 400 if (idev->cnf.forwarding) 401 ipv6_dev_mc_inc(dev, &addr); 402 else 403 ipv6_dev_mc_dec(dev, &addr); 404 } 405 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 406 if (ifa->flags&IFA_F_TENTATIVE) 407 continue; 408 if (idev->cnf.forwarding) 409 addrconf_join_anycast(ifa); 410 else 411 addrconf_leave_anycast(ifa); 412 } 413 } 414 415 416 static void addrconf_forward_change(void) 417 { 418 struct net_device *dev; 419 struct inet6_dev *idev; 420 421 read_lock(&dev_base_lock); 422 for (dev=dev_base; dev; dev=dev->next) { 423 rcu_read_lock(); 424 idev = __in6_dev_get(dev); 425 if (idev) { 426 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); 427 idev->cnf.forwarding = ipv6_devconf.forwarding; 428 if (changed) 429 dev_forward_change(idev); 430 } 431 rcu_read_unlock(); 432 } 433 read_unlock(&dev_base_lock); 434 } 435 #endif 436 437 /* Nobody refers to this ifaddr, destroy it */ 438 439 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 440 { 441 BUG_TRAP(ifp->if_next==NULL); 442 BUG_TRAP(ifp->lst_next==NULL); 443 #ifdef NET_REFCNT_DEBUG 444 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 445 #endif 446 447 in6_dev_put(ifp->idev); 448 449 if (del_timer(&ifp->timer)) 450 printk("Timer is still running, when freeing ifa=%p\n", ifp); 451 452 if (!ifp->dead) { 453 printk("Freeing alive inet6 address %p\n", ifp); 454 return; 455 } 456 dst_release(&ifp->rt->u.dst); 457 458 kfree(ifp); 459 } 460 461 static void 462 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 463 { 464 struct inet6_ifaddr *ifa, **ifap; 465 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 466 467 /* 468 * Each device address list is sorted in order of scope - 469 * global before linklocal. 470 */ 471 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 472 ifap = &ifa->if_next) { 473 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 474 break; 475 } 476 477 ifp->if_next = *ifap; 478 *ifap = ifp; 479 } 480 481 /* On success it returns ifp with increased reference count */ 482 483 static struct inet6_ifaddr * 484 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 485 int scope, u32 flags) 486 { 487 struct inet6_ifaddr *ifa = NULL; 488 struct rt6_info *rt; 489 int hash; 490 int err = 0; 491 492 rcu_read_lock_bh(); 493 if (idev->dead) { 494 err = -ENODEV; /*XXX*/ 495 goto out2; 496 } 497 498 write_lock(&addrconf_hash_lock); 499 500 /* Ignore adding duplicate addresses on an interface */ 501 if (ipv6_chk_same_addr(addr, idev->dev)) { 502 ADBG(("ipv6_add_addr: already assigned\n")); 503 err = -EEXIST; 504 goto out; 505 } 506 507 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 508 509 if (ifa == NULL) { 510 ADBG(("ipv6_add_addr: malloc failed\n")); 511 err = -ENOBUFS; 512 goto out; 513 } 514 515 rt = addrconf_dst_alloc(idev, addr, 0); 516 if (IS_ERR(rt)) { 517 err = PTR_ERR(rt); 518 goto out; 519 } 520 521 ipv6_addr_copy(&ifa->addr, addr); 522 523 spin_lock_init(&ifa->lock); 524 init_timer(&ifa->timer); 525 ifa->timer.data = (unsigned long) ifa; 526 ifa->scope = scope; 527 ifa->prefix_len = pfxlen; 528 ifa->flags = flags | IFA_F_TENTATIVE; 529 ifa->cstamp = ifa->tstamp = jiffies; 530 531 ifa->rt = rt; 532 533 /* 534 * part one of RFC 4429, section 3.3 535 * We should not configure an address as 536 * optimistic if we do not yet know the link 537 * layer address of our nexhop router 538 */ 539 540 if (rt->rt6i_nexthop == NULL) 541 ifa->flags &= ~IFA_F_OPTIMISTIC; 542 543 ifa->idev = idev; 544 in6_dev_hold(idev); 545 /* For caller */ 546 in6_ifa_hold(ifa); 547 548 /* Add to big hash table */ 549 hash = ipv6_addr_hash(addr); 550 551 ifa->lst_next = inet6_addr_lst[hash]; 552 inet6_addr_lst[hash] = ifa; 553 in6_ifa_hold(ifa); 554 write_unlock(&addrconf_hash_lock); 555 556 write_lock(&idev->lock); 557 /* Add to inet6_dev unicast addr list. */ 558 ipv6_link_dev_addr(idev, ifa); 559 560 #ifdef CONFIG_IPV6_PRIVACY 561 if (ifa->flags&IFA_F_TEMPORARY) { 562 ifa->tmp_next = idev->tempaddr_list; 563 idev->tempaddr_list = ifa; 564 in6_ifa_hold(ifa); 565 } 566 #endif 567 568 in6_ifa_hold(ifa); 569 write_unlock(&idev->lock); 570 out2: 571 rcu_read_unlock_bh(); 572 573 if (likely(err == 0)) 574 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 575 else { 576 kfree(ifa); 577 ifa = ERR_PTR(err); 578 } 579 580 return ifa; 581 out: 582 write_unlock(&addrconf_hash_lock); 583 goto out2; 584 } 585 586 /* This function wants to get referenced ifp and releases it before return */ 587 588 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 589 { 590 struct inet6_ifaddr *ifa, **ifap; 591 struct inet6_dev *idev = ifp->idev; 592 int hash; 593 int deleted = 0, onlink = 0; 594 unsigned long expires = jiffies; 595 596 hash = ipv6_addr_hash(&ifp->addr); 597 598 ifp->dead = 1; 599 600 write_lock_bh(&addrconf_hash_lock); 601 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 602 ifap = &ifa->lst_next) { 603 if (ifa == ifp) { 604 *ifap = ifa->lst_next; 605 __in6_ifa_put(ifp); 606 ifa->lst_next = NULL; 607 break; 608 } 609 } 610 write_unlock_bh(&addrconf_hash_lock); 611 612 write_lock_bh(&idev->lock); 613 #ifdef CONFIG_IPV6_PRIVACY 614 if (ifp->flags&IFA_F_TEMPORARY) { 615 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 616 ifap = &ifa->tmp_next) { 617 if (ifa == ifp) { 618 *ifap = ifa->tmp_next; 619 if (ifp->ifpub) { 620 in6_ifa_put(ifp->ifpub); 621 ifp->ifpub = NULL; 622 } 623 __in6_ifa_put(ifp); 624 ifa->tmp_next = NULL; 625 break; 626 } 627 } 628 } 629 #endif 630 631 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 632 if (ifa == ifp) { 633 *ifap = ifa->if_next; 634 __in6_ifa_put(ifp); 635 ifa->if_next = NULL; 636 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 637 break; 638 deleted = 1; 639 continue; 640 } else if (ifp->flags & IFA_F_PERMANENT) { 641 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 642 ifp->prefix_len)) { 643 if (ifa->flags & IFA_F_PERMANENT) { 644 onlink = 1; 645 if (deleted) 646 break; 647 } else { 648 unsigned long lifetime; 649 650 if (!onlink) 651 onlink = -1; 652 653 spin_lock(&ifa->lock); 654 lifetime = min_t(unsigned long, 655 ifa->valid_lft, 0x7fffffffUL/HZ); 656 if (time_before(expires, 657 ifa->tstamp + lifetime * HZ)) 658 expires = ifa->tstamp + lifetime * HZ; 659 spin_unlock(&ifa->lock); 660 } 661 } 662 } 663 ifap = &ifa->if_next; 664 } 665 write_unlock_bh(&idev->lock); 666 667 ipv6_ifa_notify(RTM_DELADDR, ifp); 668 669 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 670 671 addrconf_del_timer(ifp); 672 673 /* 674 * Purge or update corresponding prefix 675 * 676 * 1) we don't purge prefix here if address was not permanent. 677 * prefix is managed by its own lifetime. 678 * 2) if there're no addresses, delete prefix. 679 * 3) if there're still other permanent address(es), 680 * corresponding prefix is still permanent. 681 * 4) otherwise, update prefix lifetime to the 682 * longest valid lifetime among the corresponding 683 * addresses on the device. 684 * Note: subsequent RA will update lifetime. 685 * 686 * --yoshfuji 687 */ 688 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 689 struct in6_addr prefix; 690 struct rt6_info *rt; 691 692 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 693 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 694 695 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 696 if (onlink == 0) { 697 ip6_del_rt(rt); 698 rt = NULL; 699 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 700 rt->rt6i_expires = expires; 701 rt->rt6i_flags |= RTF_EXPIRES; 702 } 703 } 704 dst_release(&rt->u.dst); 705 } 706 707 in6_ifa_put(ifp); 708 } 709 710 #ifdef CONFIG_IPV6_PRIVACY 711 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 712 { 713 struct inet6_dev *idev = ifp->idev; 714 struct in6_addr addr, *tmpaddr; 715 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 716 int tmp_plen; 717 int ret = 0; 718 int max_addresses; 719 u32 addr_flags; 720 721 write_lock(&idev->lock); 722 if (ift) { 723 spin_lock_bh(&ift->lock); 724 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 725 spin_unlock_bh(&ift->lock); 726 tmpaddr = &addr; 727 } else { 728 tmpaddr = NULL; 729 } 730 retry: 731 in6_dev_hold(idev); 732 if (idev->cnf.use_tempaddr <= 0) { 733 write_unlock(&idev->lock); 734 printk(KERN_INFO 735 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 736 in6_dev_put(idev); 737 ret = -1; 738 goto out; 739 } 740 spin_lock_bh(&ifp->lock); 741 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 742 idev->cnf.use_tempaddr = -1; /*XXX*/ 743 spin_unlock_bh(&ifp->lock); 744 write_unlock(&idev->lock); 745 printk(KERN_WARNING 746 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 747 in6_dev_put(idev); 748 ret = -1; 749 goto out; 750 } 751 in6_ifa_hold(ifp); 752 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 753 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 754 spin_unlock_bh(&ifp->lock); 755 write_unlock(&idev->lock); 756 printk(KERN_WARNING 757 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 758 in6_ifa_put(ifp); 759 in6_dev_put(idev); 760 ret = -1; 761 goto out; 762 } 763 memcpy(&addr.s6_addr[8], idev->rndid, 8); 764 tmp_valid_lft = min_t(__u32, 765 ifp->valid_lft, 766 idev->cnf.temp_valid_lft); 767 tmp_prefered_lft = min_t(__u32, 768 ifp->prefered_lft, 769 idev->cnf.temp_prefered_lft - desync_factor / HZ); 770 tmp_plen = ifp->prefix_len; 771 max_addresses = idev->cnf.max_addresses; 772 tmp_cstamp = ifp->cstamp; 773 tmp_tstamp = ifp->tstamp; 774 spin_unlock_bh(&ifp->lock); 775 776 write_unlock(&idev->lock); 777 778 addr_flags = IFA_F_TEMPORARY; 779 /* set in addrconf_prefix_rcv() */ 780 if (ifp->flags & IFA_F_OPTIMISTIC) 781 addr_flags |= IFA_F_OPTIMISTIC; 782 783 ift = !max_addresses || 784 ipv6_count_addresses(idev) < max_addresses ? 785 ipv6_add_addr(idev, &addr, tmp_plen, 786 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 787 addr_flags) : NULL; 788 if (!ift || IS_ERR(ift)) { 789 in6_ifa_put(ifp); 790 in6_dev_put(idev); 791 printk(KERN_INFO 792 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 793 tmpaddr = &addr; 794 write_lock(&idev->lock); 795 goto retry; 796 } 797 798 spin_lock_bh(&ift->lock); 799 ift->ifpub = ifp; 800 ift->valid_lft = tmp_valid_lft; 801 ift->prefered_lft = tmp_prefered_lft; 802 ift->cstamp = tmp_cstamp; 803 ift->tstamp = tmp_tstamp; 804 spin_unlock_bh(&ift->lock); 805 806 addrconf_dad_start(ift, 0); 807 in6_ifa_put(ift); 808 in6_dev_put(idev); 809 out: 810 return ret; 811 } 812 #endif 813 814 /* 815 * Choose an appropriate source address (RFC3484) 816 */ 817 struct ipv6_saddr_score { 818 int addr_type; 819 unsigned int attrs; 820 int matchlen; 821 int scope; 822 unsigned int rule; 823 }; 824 825 #define IPV6_SADDR_SCORE_LOCAL 0x0001 826 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 827 #define IPV6_SADDR_SCORE_HOA 0x0008 828 #define IPV6_SADDR_SCORE_OIF 0x0010 829 #define IPV6_SADDR_SCORE_LABEL 0x0020 830 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 831 832 static inline int ipv6_saddr_preferred(int type) 833 { 834 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 835 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 836 return 1; 837 return 0; 838 } 839 840 /* static matching label */ 841 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type) 842 { 843 /* 844 * prefix (longest match) label 845 * ----------------------------- 846 * ::1/128 0 847 * ::/0 1 848 * 2002::/16 2 849 * ::/96 3 850 * ::ffff:0:0/96 4 851 * fc00::/7 5 852 * 2001::/32 6 853 */ 854 if (type & IPV6_ADDR_LOOPBACK) 855 return 0; 856 else if (type & IPV6_ADDR_COMPATv4) 857 return 3; 858 else if (type & IPV6_ADDR_MAPPED) 859 return 4; 860 else if (addr->s6_addr32[0] == htonl(0x20010000)) 861 return 6; 862 else if (addr->s6_addr16[0] == htons(0x2002)) 863 return 2; 864 else if ((addr->s6_addr[0] & 0xfe) == 0xfc) 865 return 5; 866 return 1; 867 } 868 869 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 870 struct in6_addr *daddr, struct in6_addr *saddr) 871 { 872 struct ipv6_saddr_score hiscore; 873 struct inet6_ifaddr *ifa_result = NULL; 874 int daddr_type = __ipv6_addr_type(daddr); 875 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 876 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type); 877 struct net_device *dev; 878 879 memset(&hiscore, 0, sizeof(hiscore)); 880 881 read_lock(&dev_base_lock); 882 rcu_read_lock(); 883 884 for (dev = dev_base; dev; dev=dev->next) { 885 struct inet6_dev *idev; 886 struct inet6_ifaddr *ifa; 887 888 /* Rule 0: Candidate Source Address (section 4) 889 * - multicast and link-local destination address, 890 * the set of candidate source address MUST only 891 * include addresses assigned to interfaces 892 * belonging to the same link as the outgoing 893 * interface. 894 * (- For site-local destination addresses, the 895 * set of candidate source addresses MUST only 896 * include addresses assigned to interfaces 897 * belonging to the same site as the outgoing 898 * interface.) 899 */ 900 if ((daddr_type & IPV6_ADDR_MULTICAST || 901 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 902 daddr_dev && dev != daddr_dev) 903 continue; 904 905 idev = __in6_dev_get(dev); 906 if (!idev) 907 continue; 908 909 read_lock_bh(&idev->lock); 910 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 911 struct ipv6_saddr_score score; 912 913 score.addr_type = __ipv6_addr_type(&ifa->addr); 914 915 /* Rule 0: 916 * - Tentative Address (RFC2462 section 5.4) 917 * - A tentative address is not considered 918 * "assigned to an interface" in the traditional 919 * sense, unless it is also flagged as optimistic. 920 * - Candidate Source Address (section 4) 921 * - In any case, anycast addresses, multicast 922 * addresses, and the unspecified address MUST 923 * NOT be included in a candidate set. 924 */ 925 if ((ifa->flags & IFA_F_TENTATIVE) && 926 (!(ifa->flags & IFA_F_OPTIMISTIC))) 927 continue; 928 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 929 score.addr_type & IPV6_ADDR_MULTICAST)) { 930 LIMIT_NETDEBUG(KERN_DEBUG 931 "ADDRCONF: unspecified / multicast address" 932 "assigned as unicast address on %s", 933 dev->name); 934 continue; 935 } 936 937 score.attrs = 0; 938 score.matchlen = 0; 939 score.scope = 0; 940 score.rule = 0; 941 942 if (ifa_result == NULL) { 943 /* record it if the first available entry */ 944 goto record_it; 945 } 946 947 /* Rule 1: Prefer same address */ 948 if (hiscore.rule < 1) { 949 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 950 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 951 hiscore.rule++; 952 } 953 if (ipv6_addr_equal(&ifa->addr, daddr)) { 954 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 955 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 956 score.rule = 1; 957 goto record_it; 958 } 959 } else { 960 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 961 continue; 962 } 963 964 /* Rule 2: Prefer appropriate scope */ 965 if (hiscore.rule < 2) { 966 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 967 hiscore.rule++; 968 } 969 score.scope = __ipv6_addr_src_scope(score.addr_type); 970 if (hiscore.scope < score.scope) { 971 if (hiscore.scope < daddr_scope) { 972 score.rule = 2; 973 goto record_it; 974 } else 975 continue; 976 } else if (score.scope < hiscore.scope) { 977 if (score.scope < daddr_scope) 978 break; /* addresses sorted by scope */ 979 else { 980 score.rule = 2; 981 goto record_it; 982 } 983 } 984 985 /* Rule 3: Avoid deprecated and optimistic addresses */ 986 if (hiscore.rule < 3) { 987 if (ipv6_saddr_preferred(hiscore.addr_type) || 988 (((ifa_result->flags & 989 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) 990 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 991 hiscore.rule++; 992 } 993 if (ipv6_saddr_preferred(score.addr_type) || 994 (((ifa_result->flags & 995 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) { 996 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 997 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 998 score.rule = 3; 999 goto record_it; 1000 } 1001 } else { 1002 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 1003 continue; 1004 } 1005 1006 /* Rule 4: Prefer home address */ 1007 #ifdef CONFIG_IPV6_MIP6 1008 if (hiscore.rule < 4) { 1009 if (ifa_result->flags & IFA_F_HOMEADDRESS) 1010 hiscore.attrs |= IPV6_SADDR_SCORE_HOA; 1011 hiscore.rule++; 1012 } 1013 if (ifa->flags & IFA_F_HOMEADDRESS) { 1014 score.attrs |= IPV6_SADDR_SCORE_HOA; 1015 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) { 1016 score.rule = 4; 1017 goto record_it; 1018 } 1019 } else { 1020 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA) 1021 continue; 1022 } 1023 #else 1024 if (hiscore.rule < 4) 1025 hiscore.rule++; 1026 #endif 1027 1028 /* Rule 5: Prefer outgoing interface */ 1029 if (hiscore.rule < 5) { 1030 if (daddr_dev == NULL || 1031 daddr_dev == ifa_result->idev->dev) 1032 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1033 hiscore.rule++; 1034 } 1035 if (daddr_dev == NULL || 1036 daddr_dev == ifa->idev->dev) { 1037 score.attrs |= IPV6_SADDR_SCORE_OIF; 1038 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1039 score.rule = 5; 1040 goto record_it; 1041 } 1042 } else { 1043 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1044 continue; 1045 } 1046 1047 /* Rule 6: Prefer matching label */ 1048 if (hiscore.rule < 6) { 1049 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) 1050 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1051 hiscore.rule++; 1052 } 1053 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { 1054 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1055 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1056 score.rule = 6; 1057 goto record_it; 1058 } 1059 } else { 1060 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1061 continue; 1062 } 1063 1064 #ifdef CONFIG_IPV6_PRIVACY 1065 /* Rule 7: Prefer public address 1066 * Note: prefer temprary address if use_tempaddr >= 2 1067 */ 1068 if (hiscore.rule < 7) { 1069 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1070 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1071 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1072 hiscore.rule++; 1073 } 1074 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1075 (ifa->idev->cnf.use_tempaddr >= 2)) { 1076 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1077 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1078 score.rule = 7; 1079 goto record_it; 1080 } 1081 } else { 1082 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1083 continue; 1084 } 1085 #else 1086 if (hiscore.rule < 7) 1087 hiscore.rule++; 1088 #endif 1089 /* Rule 8: Use longest matching prefix */ 1090 if (hiscore.rule < 8) { 1091 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1092 hiscore.rule++; 1093 } 1094 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1095 if (score.matchlen > hiscore.matchlen) { 1096 score.rule = 8; 1097 goto record_it; 1098 } 1099 #if 0 1100 else if (score.matchlen < hiscore.matchlen) 1101 continue; 1102 #endif 1103 1104 /* Final Rule: choose first available one */ 1105 continue; 1106 record_it: 1107 if (ifa_result) 1108 in6_ifa_put(ifa_result); 1109 in6_ifa_hold(ifa); 1110 ifa_result = ifa; 1111 hiscore = score; 1112 } 1113 read_unlock_bh(&idev->lock); 1114 } 1115 rcu_read_unlock(); 1116 read_unlock(&dev_base_lock); 1117 1118 if (!ifa_result) 1119 return -EADDRNOTAVAIL; 1120 1121 ipv6_addr_copy(saddr, &ifa_result->addr); 1122 in6_ifa_put(ifa_result); 1123 return 0; 1124 } 1125 1126 1127 int ipv6_get_saddr(struct dst_entry *dst, 1128 struct in6_addr *daddr, struct in6_addr *saddr) 1129 { 1130 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr); 1131 } 1132 1133 EXPORT_SYMBOL(ipv6_get_saddr); 1134 1135 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1136 unsigned char banned_flags) 1137 { 1138 struct inet6_dev *idev; 1139 int err = -EADDRNOTAVAIL; 1140 1141 rcu_read_lock(); 1142 if ((idev = __in6_dev_get(dev)) != NULL) { 1143 struct inet6_ifaddr *ifp; 1144 1145 read_lock_bh(&idev->lock); 1146 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1147 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1148 ipv6_addr_copy(addr, &ifp->addr); 1149 err = 0; 1150 break; 1151 } 1152 } 1153 read_unlock_bh(&idev->lock); 1154 } 1155 rcu_read_unlock(); 1156 return err; 1157 } 1158 1159 static int ipv6_count_addresses(struct inet6_dev *idev) 1160 { 1161 int cnt = 0; 1162 struct inet6_ifaddr *ifp; 1163 1164 read_lock_bh(&idev->lock); 1165 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1166 cnt++; 1167 read_unlock_bh(&idev->lock); 1168 return cnt; 1169 } 1170 1171 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1172 { 1173 struct inet6_ifaddr * ifp; 1174 u8 hash = ipv6_addr_hash(addr); 1175 1176 read_lock_bh(&addrconf_hash_lock); 1177 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1178 if (ipv6_addr_equal(&ifp->addr, addr) && 1179 !(ifp->flags&IFA_F_TENTATIVE)) { 1180 if (dev == NULL || ifp->idev->dev == dev || 1181 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1182 break; 1183 } 1184 } 1185 read_unlock_bh(&addrconf_hash_lock); 1186 return ifp != NULL; 1187 } 1188 1189 EXPORT_SYMBOL(ipv6_chk_addr); 1190 1191 static 1192 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1193 { 1194 struct inet6_ifaddr * ifp; 1195 u8 hash = ipv6_addr_hash(addr); 1196 1197 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1198 if (ipv6_addr_equal(&ifp->addr, addr)) { 1199 if (dev == NULL || ifp->idev->dev == dev) 1200 break; 1201 } 1202 } 1203 return ifp != NULL; 1204 } 1205 1206 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1207 { 1208 struct inet6_ifaddr * ifp; 1209 u8 hash = ipv6_addr_hash(addr); 1210 1211 read_lock_bh(&addrconf_hash_lock); 1212 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1213 if (ipv6_addr_equal(&ifp->addr, addr)) { 1214 if (dev == NULL || ifp->idev->dev == dev || 1215 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1216 in6_ifa_hold(ifp); 1217 break; 1218 } 1219 } 1220 } 1221 read_unlock_bh(&addrconf_hash_lock); 1222 1223 return ifp; 1224 } 1225 1226 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1227 { 1228 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1229 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1230 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1231 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1232 int sk_ipv6only = ipv6_only_sock(sk); 1233 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1234 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1235 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1236 1237 if (!sk2_rcv_saddr && !sk_ipv6only) 1238 return 1; 1239 1240 if (addr_type2 == IPV6_ADDR_ANY && 1241 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1242 return 1; 1243 1244 if (addr_type == IPV6_ADDR_ANY && 1245 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1246 return 1; 1247 1248 if (sk2_rcv_saddr6 && 1249 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1250 return 1; 1251 1252 if (addr_type == IPV6_ADDR_MAPPED && 1253 !sk2_ipv6only && 1254 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1255 return 1; 1256 1257 return 0; 1258 } 1259 1260 /* Gets referenced address, destroys ifaddr */ 1261 1262 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1263 { 1264 if (ifp->flags&IFA_F_PERMANENT) { 1265 spin_lock_bh(&ifp->lock); 1266 addrconf_del_timer(ifp); 1267 ifp->flags |= IFA_F_TENTATIVE; 1268 spin_unlock_bh(&ifp->lock); 1269 in6_ifa_put(ifp); 1270 #ifdef CONFIG_IPV6_PRIVACY 1271 } else if (ifp->flags&IFA_F_TEMPORARY) { 1272 struct inet6_ifaddr *ifpub; 1273 spin_lock_bh(&ifp->lock); 1274 ifpub = ifp->ifpub; 1275 if (ifpub) { 1276 in6_ifa_hold(ifpub); 1277 spin_unlock_bh(&ifp->lock); 1278 ipv6_create_tempaddr(ifpub, ifp); 1279 in6_ifa_put(ifpub); 1280 } else { 1281 spin_unlock_bh(&ifp->lock); 1282 } 1283 ipv6_del_addr(ifp); 1284 #endif 1285 } else 1286 ipv6_del_addr(ifp); 1287 } 1288 1289 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1290 { 1291 if (net_ratelimit()) 1292 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1293 addrconf_dad_stop(ifp); 1294 } 1295 1296 /* Join to solicited addr multicast group. */ 1297 1298 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1299 { 1300 struct in6_addr maddr; 1301 1302 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1303 return; 1304 1305 addrconf_addr_solict_mult(addr, &maddr); 1306 ipv6_dev_mc_inc(dev, &maddr); 1307 } 1308 1309 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1310 { 1311 struct in6_addr maddr; 1312 1313 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1314 return; 1315 1316 addrconf_addr_solict_mult(addr, &maddr); 1317 __ipv6_dev_mc_dec(idev, &maddr); 1318 } 1319 1320 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1321 { 1322 struct in6_addr addr; 1323 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1324 if (ipv6_addr_any(&addr)) 1325 return; 1326 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1327 } 1328 1329 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1330 { 1331 struct in6_addr addr; 1332 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1333 if (ipv6_addr_any(&addr)) 1334 return; 1335 __ipv6_dev_ac_dec(ifp->idev, &addr); 1336 } 1337 1338 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1339 { 1340 if (dev->addr_len != ETH_ALEN) 1341 return -1; 1342 memcpy(eui, dev->dev_addr, 3); 1343 memcpy(eui + 5, dev->dev_addr + 3, 3); 1344 1345 /* 1346 * The zSeries OSA network cards can be shared among various 1347 * OS instances, but the OSA cards have only one MAC address. 1348 * This leads to duplicate address conflicts in conjunction 1349 * with IPv6 if more than one instance uses the same card. 1350 * 1351 * The driver for these cards can deliver a unique 16-bit 1352 * identifier for each instance sharing the same card. It is 1353 * placed instead of 0xFFFE in the interface identifier. The 1354 * "u" bit of the interface identifier is not inverted in this 1355 * case. Hence the resulting interface identifier has local 1356 * scope according to RFC2373. 1357 */ 1358 if (dev->dev_id) { 1359 eui[3] = (dev->dev_id >> 8) & 0xFF; 1360 eui[4] = dev->dev_id & 0xFF; 1361 } else { 1362 eui[3] = 0xFF; 1363 eui[4] = 0xFE; 1364 eui[0] ^= 2; 1365 } 1366 return 0; 1367 } 1368 1369 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1370 { 1371 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1372 if (dev->addr_len != ARCNET_ALEN) 1373 return -1; 1374 memset(eui, 0, 7); 1375 eui[7] = *(u8*)dev->dev_addr; 1376 return 0; 1377 } 1378 1379 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1380 { 1381 if (dev->addr_len != INFINIBAND_ALEN) 1382 return -1; 1383 memcpy(eui, dev->dev_addr + 12, 8); 1384 eui[0] |= 2; 1385 return 0; 1386 } 1387 1388 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1389 { 1390 switch (dev->type) { 1391 case ARPHRD_ETHER: 1392 case ARPHRD_FDDI: 1393 case ARPHRD_IEEE802_TR: 1394 return addrconf_ifid_eui48(eui, dev); 1395 case ARPHRD_ARCNET: 1396 return addrconf_ifid_arcnet(eui, dev); 1397 case ARPHRD_INFINIBAND: 1398 return addrconf_ifid_infiniband(eui, dev); 1399 } 1400 return -1; 1401 } 1402 1403 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1404 { 1405 int err = -1; 1406 struct inet6_ifaddr *ifp; 1407 1408 read_lock_bh(&idev->lock); 1409 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1410 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1411 memcpy(eui, ifp->addr.s6_addr+8, 8); 1412 err = 0; 1413 break; 1414 } 1415 } 1416 read_unlock_bh(&idev->lock); 1417 return err; 1418 } 1419 1420 #ifdef CONFIG_IPV6_PRIVACY 1421 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1422 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1423 { 1424 regen: 1425 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1426 idev->rndid[0] &= ~0x02; 1427 1428 /* 1429 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1430 * check if generated address is not inappropriate 1431 * 1432 * - Reserved subnet anycast (RFC 2526) 1433 * 11111101 11....11 1xxxxxxx 1434 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 1435 * 00-00-5E-FE-xx-xx-xx-xx 1436 * - value 0 1437 * - XXX: already assigned to an address on the device 1438 */ 1439 if (idev->rndid[0] == 0xfd && 1440 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1441 (idev->rndid[7]&0x80)) 1442 goto regen; 1443 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1444 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1445 goto regen; 1446 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1447 goto regen; 1448 } 1449 1450 return 0; 1451 } 1452 1453 static void ipv6_regen_rndid(unsigned long data) 1454 { 1455 struct inet6_dev *idev = (struct inet6_dev *) data; 1456 unsigned long expires; 1457 1458 rcu_read_lock_bh(); 1459 write_lock_bh(&idev->lock); 1460 1461 if (idev->dead) 1462 goto out; 1463 1464 if (__ipv6_regen_rndid(idev) < 0) 1465 goto out; 1466 1467 expires = jiffies + 1468 idev->cnf.temp_prefered_lft * HZ - 1469 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1470 if (time_before(expires, jiffies)) { 1471 printk(KERN_WARNING 1472 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1473 idev->dev->name); 1474 goto out; 1475 } 1476 1477 if (!mod_timer(&idev->regen_timer, expires)) 1478 in6_dev_hold(idev); 1479 1480 out: 1481 write_unlock_bh(&idev->lock); 1482 rcu_read_unlock_bh(); 1483 in6_dev_put(idev); 1484 } 1485 1486 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1487 int ret = 0; 1488 1489 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1490 ret = __ipv6_regen_rndid(idev); 1491 return ret; 1492 } 1493 #endif 1494 1495 /* 1496 * Add prefix route. 1497 */ 1498 1499 static void 1500 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1501 unsigned long expires, u32 flags) 1502 { 1503 struct fib6_config cfg = { 1504 .fc_table = RT6_TABLE_PREFIX, 1505 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1506 .fc_ifindex = dev->ifindex, 1507 .fc_expires = expires, 1508 .fc_dst_len = plen, 1509 .fc_flags = RTF_UP | flags, 1510 }; 1511 1512 ipv6_addr_copy(&cfg.fc_dst, pfx); 1513 1514 /* Prevent useless cloning on PtP SIT. 1515 This thing is done here expecting that the whole 1516 class of non-broadcast devices need not cloning. 1517 */ 1518 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1519 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1520 cfg.fc_flags |= RTF_NONEXTHOP; 1521 #endif 1522 1523 ip6_route_add(&cfg); 1524 } 1525 1526 /* Create "default" multicast route to the interface */ 1527 1528 static void addrconf_add_mroute(struct net_device *dev) 1529 { 1530 struct fib6_config cfg = { 1531 .fc_table = RT6_TABLE_LOCAL, 1532 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1533 .fc_ifindex = dev->ifindex, 1534 .fc_dst_len = 8, 1535 .fc_flags = RTF_UP, 1536 }; 1537 1538 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1539 1540 ip6_route_add(&cfg); 1541 } 1542 1543 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1544 static void sit_route_add(struct net_device *dev) 1545 { 1546 struct fib6_config cfg = { 1547 .fc_table = RT6_TABLE_MAIN, 1548 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1549 .fc_ifindex = dev->ifindex, 1550 .fc_dst_len = 96, 1551 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1552 }; 1553 1554 /* prefix length - 96 bits "::d.d.d.d" */ 1555 ip6_route_add(&cfg); 1556 } 1557 #endif 1558 1559 static void addrconf_add_lroute(struct net_device *dev) 1560 { 1561 struct in6_addr addr; 1562 1563 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1564 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1565 } 1566 1567 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1568 { 1569 struct inet6_dev *idev; 1570 1571 ASSERT_RTNL(); 1572 1573 if ((idev = ipv6_find_idev(dev)) == NULL) 1574 return NULL; 1575 1576 /* Add default multicast route */ 1577 addrconf_add_mroute(dev); 1578 1579 /* Add link local route */ 1580 addrconf_add_lroute(dev); 1581 return idev; 1582 } 1583 1584 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1585 { 1586 struct prefix_info *pinfo; 1587 __u32 valid_lft; 1588 __u32 prefered_lft; 1589 int addr_type; 1590 unsigned long rt_expires; 1591 struct inet6_dev *in6_dev; 1592 1593 pinfo = (struct prefix_info *) opt; 1594 1595 if (len < sizeof(struct prefix_info)) { 1596 ADBG(("addrconf: prefix option too short\n")); 1597 return; 1598 } 1599 1600 /* 1601 * Validation checks ([ADDRCONF], page 19) 1602 */ 1603 1604 addr_type = ipv6_addr_type(&pinfo->prefix); 1605 1606 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1607 return; 1608 1609 valid_lft = ntohl(pinfo->valid); 1610 prefered_lft = ntohl(pinfo->prefered); 1611 1612 if (prefered_lft > valid_lft) { 1613 if (net_ratelimit()) 1614 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1615 return; 1616 } 1617 1618 in6_dev = in6_dev_get(dev); 1619 1620 if (in6_dev == NULL) { 1621 if (net_ratelimit()) 1622 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1623 return; 1624 } 1625 1626 /* 1627 * Two things going on here: 1628 * 1) Add routes for on-link prefixes 1629 * 2) Configure prefixes with the auto flag set 1630 */ 1631 1632 /* Avoid arithmetic overflow. Really, we could 1633 save rt_expires in seconds, likely valid_lft, 1634 but it would require division in fib gc, that it 1635 not good. 1636 */ 1637 if (valid_lft >= 0x7FFFFFFF/HZ) 1638 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1639 else 1640 rt_expires = valid_lft * HZ; 1641 1642 /* 1643 * We convert this (in jiffies) to clock_t later. 1644 * Avoid arithmetic overflow there as well. 1645 * Overflow can happen only if HZ < USER_HZ. 1646 */ 1647 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1648 rt_expires = 0x7FFFFFFF / USER_HZ; 1649 1650 if (pinfo->onlink) { 1651 struct rt6_info *rt; 1652 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1653 1654 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1655 if (rt->rt6i_flags&RTF_EXPIRES) { 1656 if (valid_lft == 0) { 1657 ip6_del_rt(rt); 1658 rt = NULL; 1659 } else { 1660 rt->rt6i_expires = jiffies + rt_expires; 1661 } 1662 } 1663 } else if (valid_lft) { 1664 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1665 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1666 } 1667 if (rt) 1668 dst_release(&rt->u.dst); 1669 } 1670 1671 /* Try to figure out our local address for this prefix */ 1672 1673 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1674 struct inet6_ifaddr * ifp; 1675 struct in6_addr addr; 1676 int create = 0, update_lft = 0; 1677 1678 if (pinfo->prefix_len == 64) { 1679 memcpy(&addr, &pinfo->prefix, 8); 1680 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1681 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1682 in6_dev_put(in6_dev); 1683 return; 1684 } 1685 goto ok; 1686 } 1687 if (net_ratelimit()) 1688 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1689 pinfo->prefix_len); 1690 in6_dev_put(in6_dev); 1691 return; 1692 1693 ok: 1694 1695 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1696 1697 if (ifp == NULL && valid_lft) { 1698 int max_addresses = in6_dev->cnf.max_addresses; 1699 u32 addr_flags = 0; 1700 1701 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1702 if (in6_dev->cnf.optimistic_dad && 1703 !ipv6_devconf.forwarding) 1704 addr_flags = IFA_F_OPTIMISTIC; 1705 #endif 1706 1707 /* Do not allow to create too much of autoconfigured 1708 * addresses; this would be too easy way to crash kernel. 1709 */ 1710 if (!max_addresses || 1711 ipv6_count_addresses(in6_dev) < max_addresses) 1712 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1713 addr_type&IPV6_ADDR_SCOPE_MASK, 1714 addr_flags); 1715 1716 if (!ifp || IS_ERR(ifp)) { 1717 in6_dev_put(in6_dev); 1718 return; 1719 } 1720 1721 update_lft = create = 1; 1722 ifp->cstamp = jiffies; 1723 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1724 } 1725 1726 if (ifp) { 1727 int flags; 1728 unsigned long now; 1729 #ifdef CONFIG_IPV6_PRIVACY 1730 struct inet6_ifaddr *ift; 1731 #endif 1732 u32 stored_lft; 1733 1734 /* update lifetime (RFC2462 5.5.3 e) */ 1735 spin_lock(&ifp->lock); 1736 now = jiffies; 1737 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1738 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1739 else 1740 stored_lft = 0; 1741 if (!update_lft && stored_lft) { 1742 if (valid_lft > MIN_VALID_LIFETIME || 1743 valid_lft > stored_lft) 1744 update_lft = 1; 1745 else if (stored_lft <= MIN_VALID_LIFETIME) { 1746 /* valid_lft <= stored_lft is always true */ 1747 /* XXX: IPsec */ 1748 update_lft = 0; 1749 } else { 1750 valid_lft = MIN_VALID_LIFETIME; 1751 if (valid_lft < prefered_lft) 1752 prefered_lft = valid_lft; 1753 update_lft = 1; 1754 } 1755 } 1756 1757 if (update_lft) { 1758 ifp->valid_lft = valid_lft; 1759 ifp->prefered_lft = prefered_lft; 1760 ifp->tstamp = now; 1761 flags = ifp->flags; 1762 ifp->flags &= ~IFA_F_DEPRECATED; 1763 spin_unlock(&ifp->lock); 1764 1765 if (!(flags&IFA_F_TENTATIVE)) 1766 ipv6_ifa_notify(0, ifp); 1767 } else 1768 spin_unlock(&ifp->lock); 1769 1770 #ifdef CONFIG_IPV6_PRIVACY 1771 read_lock_bh(&in6_dev->lock); 1772 /* update all temporary addresses in the list */ 1773 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1774 /* 1775 * When adjusting the lifetimes of an existing 1776 * temporary address, only lower the lifetimes. 1777 * Implementations must not increase the 1778 * lifetimes of an existing temporary address 1779 * when processing a Prefix Information Option. 1780 */ 1781 spin_lock(&ift->lock); 1782 flags = ift->flags; 1783 if (ift->valid_lft > valid_lft && 1784 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1785 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1786 if (ift->prefered_lft > prefered_lft && 1787 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1788 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1789 spin_unlock(&ift->lock); 1790 if (!(flags&IFA_F_TENTATIVE)) 1791 ipv6_ifa_notify(0, ift); 1792 } 1793 1794 if (create && in6_dev->cnf.use_tempaddr > 0) { 1795 /* 1796 * When a new public address is created as described in [ADDRCONF], 1797 * also create a new temporary address. 1798 */ 1799 read_unlock_bh(&in6_dev->lock); 1800 ipv6_create_tempaddr(ifp, NULL); 1801 } else { 1802 read_unlock_bh(&in6_dev->lock); 1803 } 1804 #endif 1805 in6_ifa_put(ifp); 1806 addrconf_verify(0); 1807 } 1808 } 1809 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1810 in6_dev_put(in6_dev); 1811 } 1812 1813 /* 1814 * Set destination address. 1815 * Special case for SIT interfaces where we create a new "virtual" 1816 * device. 1817 */ 1818 int addrconf_set_dstaddr(void __user *arg) 1819 { 1820 struct in6_ifreq ireq; 1821 struct net_device *dev; 1822 int err = -EINVAL; 1823 1824 rtnl_lock(); 1825 1826 err = -EFAULT; 1827 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1828 goto err_exit; 1829 1830 dev = __dev_get_by_index(ireq.ifr6_ifindex); 1831 1832 err = -ENODEV; 1833 if (dev == NULL) 1834 goto err_exit; 1835 1836 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1837 if (dev->type == ARPHRD_SIT) { 1838 struct ifreq ifr; 1839 mm_segment_t oldfs; 1840 struct ip_tunnel_parm p; 1841 1842 err = -EADDRNOTAVAIL; 1843 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1844 goto err_exit; 1845 1846 memset(&p, 0, sizeof(p)); 1847 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1848 p.iph.saddr = 0; 1849 p.iph.version = 4; 1850 p.iph.ihl = 5; 1851 p.iph.protocol = IPPROTO_IPV6; 1852 p.iph.ttl = 64; 1853 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1854 1855 oldfs = get_fs(); set_fs(KERNEL_DS); 1856 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1857 set_fs(oldfs); 1858 1859 if (err == 0) { 1860 err = -ENOBUFS; 1861 if ((dev = __dev_get_by_name(p.name)) == NULL) 1862 goto err_exit; 1863 err = dev_open(dev); 1864 } 1865 } 1866 #endif 1867 1868 err_exit: 1869 rtnl_unlock(); 1870 return err; 1871 } 1872 1873 /* 1874 * Manual configuration of address on an interface 1875 */ 1876 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1877 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft) 1878 { 1879 struct inet6_ifaddr *ifp; 1880 struct inet6_dev *idev; 1881 struct net_device *dev; 1882 int scope; 1883 u32 flags = RTF_EXPIRES; 1884 1885 ASSERT_RTNL(); 1886 1887 /* check the lifetime */ 1888 if (!valid_lft || prefered_lft > valid_lft) 1889 return -EINVAL; 1890 1891 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1892 return -ENODEV; 1893 1894 if ((idev = addrconf_add_dev(dev)) == NULL) 1895 return -ENOBUFS; 1896 1897 scope = ipv6_addr_scope(pfx); 1898 1899 if (valid_lft == INFINITY_LIFE_TIME) { 1900 ifa_flags |= IFA_F_PERMANENT; 1901 flags = 0; 1902 } else if (valid_lft >= 0x7FFFFFFF/HZ) 1903 valid_lft = 0x7FFFFFFF/HZ; 1904 1905 if (prefered_lft == 0) 1906 ifa_flags |= IFA_F_DEPRECATED; 1907 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1908 (prefered_lft != INFINITY_LIFE_TIME)) 1909 prefered_lft = 0x7FFFFFFF/HZ; 1910 1911 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1912 1913 if (!IS_ERR(ifp)) { 1914 spin_lock_bh(&ifp->lock); 1915 ifp->valid_lft = valid_lft; 1916 ifp->prefered_lft = prefered_lft; 1917 ifp->tstamp = jiffies; 1918 spin_unlock_bh(&ifp->lock); 1919 1920 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 1921 jiffies_to_clock_t(valid_lft * HZ), flags); 1922 /* 1923 * Note that section 3.1 of RFC 4429 indicates 1924 * that the Optimistic flag should not be set for 1925 * manually configured addresses 1926 */ 1927 addrconf_dad_start(ifp, 0); 1928 in6_ifa_put(ifp); 1929 addrconf_verify(0); 1930 return 0; 1931 } 1932 1933 return PTR_ERR(ifp); 1934 } 1935 1936 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1937 { 1938 struct inet6_ifaddr *ifp; 1939 struct inet6_dev *idev; 1940 struct net_device *dev; 1941 1942 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1943 return -ENODEV; 1944 1945 if ((idev = __in6_dev_get(dev)) == NULL) 1946 return -ENXIO; 1947 1948 read_lock_bh(&idev->lock); 1949 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1950 if (ifp->prefix_len == plen && 1951 ipv6_addr_equal(pfx, &ifp->addr)) { 1952 in6_ifa_hold(ifp); 1953 read_unlock_bh(&idev->lock); 1954 1955 ipv6_del_addr(ifp); 1956 1957 /* If the last address is deleted administratively, 1958 disable IPv6 on this interface. 1959 */ 1960 if (idev->addr_list == NULL) 1961 addrconf_ifdown(idev->dev, 1); 1962 return 0; 1963 } 1964 } 1965 read_unlock_bh(&idev->lock); 1966 return -EADDRNOTAVAIL; 1967 } 1968 1969 1970 int addrconf_add_ifaddr(void __user *arg) 1971 { 1972 struct in6_ifreq ireq; 1973 int err; 1974 1975 if (!capable(CAP_NET_ADMIN)) 1976 return -EPERM; 1977 1978 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1979 return -EFAULT; 1980 1981 rtnl_lock(); 1982 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 1983 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 1984 rtnl_unlock(); 1985 return err; 1986 } 1987 1988 int addrconf_del_ifaddr(void __user *arg) 1989 { 1990 struct in6_ifreq ireq; 1991 int err; 1992 1993 if (!capable(CAP_NET_ADMIN)) 1994 return -EPERM; 1995 1996 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1997 return -EFAULT; 1998 1999 rtnl_lock(); 2000 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 2001 rtnl_unlock(); 2002 return err; 2003 } 2004 2005 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2006 static void sit_add_v4_addrs(struct inet6_dev *idev) 2007 { 2008 struct inet6_ifaddr * ifp; 2009 struct in6_addr addr; 2010 struct net_device *dev; 2011 int scope; 2012 2013 ASSERT_RTNL(); 2014 2015 memset(&addr, 0, sizeof(struct in6_addr)); 2016 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2017 2018 if (idev->dev->flags&IFF_POINTOPOINT) { 2019 addr.s6_addr32[0] = htonl(0xfe800000); 2020 scope = IFA_LINK; 2021 } else { 2022 scope = IPV6_ADDR_COMPATv4; 2023 } 2024 2025 if (addr.s6_addr32[3]) { 2026 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2027 if (!IS_ERR(ifp)) { 2028 spin_lock_bh(&ifp->lock); 2029 ifp->flags &= ~IFA_F_TENTATIVE; 2030 spin_unlock_bh(&ifp->lock); 2031 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2032 in6_ifa_put(ifp); 2033 } 2034 return; 2035 } 2036 2037 for (dev = dev_base; dev != NULL; dev = dev->next) { 2038 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2039 if (in_dev && (dev->flags & IFF_UP)) { 2040 struct in_ifaddr * ifa; 2041 2042 int flag = scope; 2043 2044 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2045 int plen; 2046 2047 addr.s6_addr32[3] = ifa->ifa_local; 2048 2049 if (ifa->ifa_scope == RT_SCOPE_LINK) 2050 continue; 2051 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2052 if (idev->dev->flags&IFF_POINTOPOINT) 2053 continue; 2054 flag |= IFA_HOST; 2055 } 2056 if (idev->dev->flags&IFF_POINTOPOINT) 2057 plen = 64; 2058 else 2059 plen = 96; 2060 2061 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2062 IFA_F_PERMANENT); 2063 if (!IS_ERR(ifp)) { 2064 spin_lock_bh(&ifp->lock); 2065 ifp->flags &= ~IFA_F_TENTATIVE; 2066 spin_unlock_bh(&ifp->lock); 2067 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2068 in6_ifa_put(ifp); 2069 } 2070 } 2071 } 2072 } 2073 } 2074 #endif 2075 2076 static void init_loopback(struct net_device *dev) 2077 { 2078 struct inet6_dev *idev; 2079 struct inet6_ifaddr * ifp; 2080 2081 /* ::1 */ 2082 2083 ASSERT_RTNL(); 2084 2085 if ((idev = ipv6_find_idev(dev)) == NULL) { 2086 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2087 return; 2088 } 2089 2090 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2091 if (!IS_ERR(ifp)) { 2092 spin_lock_bh(&ifp->lock); 2093 ifp->flags &= ~IFA_F_TENTATIVE; 2094 spin_unlock_bh(&ifp->lock); 2095 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2096 in6_ifa_put(ifp); 2097 } 2098 } 2099 2100 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2101 { 2102 struct inet6_ifaddr * ifp; 2103 u32 addr_flags = IFA_F_PERMANENT; 2104 2105 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2106 if (idev->cnf.optimistic_dad && 2107 !ipv6_devconf.forwarding) 2108 addr_flags |= IFA_F_OPTIMISTIC; 2109 #endif 2110 2111 2112 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2113 if (!IS_ERR(ifp)) { 2114 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2115 addrconf_dad_start(ifp, 0); 2116 in6_ifa_put(ifp); 2117 } 2118 } 2119 2120 static void addrconf_dev_config(struct net_device *dev) 2121 { 2122 struct in6_addr addr; 2123 struct inet6_dev * idev; 2124 2125 ASSERT_RTNL(); 2126 2127 if ((dev->type != ARPHRD_ETHER) && 2128 (dev->type != ARPHRD_FDDI) && 2129 (dev->type != ARPHRD_IEEE802_TR) && 2130 (dev->type != ARPHRD_ARCNET) && 2131 (dev->type != ARPHRD_INFINIBAND)) { 2132 /* Alas, we support only Ethernet autoconfiguration. */ 2133 return; 2134 } 2135 2136 idev = addrconf_add_dev(dev); 2137 if (idev == NULL) 2138 return; 2139 2140 memset(&addr, 0, sizeof(struct in6_addr)); 2141 addr.s6_addr32[0] = htonl(0xFE800000); 2142 2143 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2144 addrconf_add_linklocal(idev, &addr); 2145 } 2146 2147 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2148 static void addrconf_sit_config(struct net_device *dev) 2149 { 2150 struct inet6_dev *idev; 2151 2152 ASSERT_RTNL(); 2153 2154 /* 2155 * Configure the tunnel with one of our IPv4 2156 * addresses... we should configure all of 2157 * our v4 addrs in the tunnel 2158 */ 2159 2160 if ((idev = ipv6_find_idev(dev)) == NULL) { 2161 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2162 return; 2163 } 2164 2165 sit_add_v4_addrs(idev); 2166 2167 if (dev->flags&IFF_POINTOPOINT) { 2168 addrconf_add_mroute(dev); 2169 addrconf_add_lroute(dev); 2170 } else 2171 sit_route_add(dev); 2172 } 2173 #endif 2174 2175 static inline int 2176 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2177 { 2178 struct in6_addr lladdr; 2179 2180 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2181 addrconf_add_linklocal(idev, &lladdr); 2182 return 0; 2183 } 2184 return -1; 2185 } 2186 2187 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2188 { 2189 struct net_device *link_dev; 2190 2191 /* first try to inherit the link-local address from the link device */ 2192 if (idev->dev->iflink && 2193 (link_dev = __dev_get_by_index(idev->dev->iflink))) { 2194 if (!ipv6_inherit_linklocal(idev, link_dev)) 2195 return; 2196 } 2197 /* then try to inherit it from any device */ 2198 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) { 2199 if (!ipv6_inherit_linklocal(idev, link_dev)) 2200 return; 2201 } 2202 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2203 } 2204 2205 /* 2206 * Autoconfigure tunnel with a link-local address so routing protocols, 2207 * DHCPv6, MLD etc. can be run over the virtual link 2208 */ 2209 2210 static void addrconf_ip6_tnl_config(struct net_device *dev) 2211 { 2212 struct inet6_dev *idev; 2213 2214 ASSERT_RTNL(); 2215 2216 if ((idev = addrconf_add_dev(dev)) == NULL) { 2217 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2218 return; 2219 } 2220 ip6_tnl_add_linklocal(idev); 2221 } 2222 2223 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2224 void * data) 2225 { 2226 struct net_device *dev = (struct net_device *) data; 2227 struct inet6_dev *idev = __in6_dev_get(dev); 2228 int run_pending = 0; 2229 2230 switch(event) { 2231 case NETDEV_REGISTER: 2232 if (!idev) { 2233 idev = ipv6_add_dev(dev); 2234 if (!idev) 2235 printk(KERN_WARNING "IPv6: add_dev failed for %s\n", 2236 dev->name); 2237 } 2238 break; 2239 case NETDEV_UP: 2240 case NETDEV_CHANGE: 2241 if (event == NETDEV_UP) { 2242 if (!netif_carrier_ok(dev)) { 2243 /* device is not ready yet. */ 2244 printk(KERN_INFO 2245 "ADDRCONF(NETDEV_UP): %s: " 2246 "link is not ready\n", 2247 dev->name); 2248 break; 2249 } 2250 2251 if (idev) 2252 idev->if_flags |= IF_READY; 2253 } else { 2254 if (!netif_carrier_ok(dev)) { 2255 /* device is still not ready. */ 2256 break; 2257 } 2258 2259 if (idev) { 2260 if (idev->if_flags & IF_READY) { 2261 /* device is already configured. */ 2262 break; 2263 } 2264 idev->if_flags |= IF_READY; 2265 } 2266 2267 printk(KERN_INFO 2268 "ADDRCONF(NETDEV_CHANGE): %s: " 2269 "link becomes ready\n", 2270 dev->name); 2271 2272 run_pending = 1; 2273 } 2274 2275 switch(dev->type) { 2276 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2277 case ARPHRD_SIT: 2278 addrconf_sit_config(dev); 2279 break; 2280 #endif 2281 case ARPHRD_TUNNEL6: 2282 addrconf_ip6_tnl_config(dev); 2283 break; 2284 case ARPHRD_LOOPBACK: 2285 init_loopback(dev); 2286 break; 2287 2288 default: 2289 addrconf_dev_config(dev); 2290 break; 2291 }; 2292 if (idev) { 2293 if (run_pending) 2294 addrconf_dad_run(idev); 2295 2296 /* If the MTU changed during the interface down, when the 2297 interface up, the changed MTU must be reflected in the 2298 idev as well as routers. 2299 */ 2300 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2301 rt6_mtu_change(dev, dev->mtu); 2302 idev->cnf.mtu6 = dev->mtu; 2303 } 2304 idev->tstamp = jiffies; 2305 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2306 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2307 stop IPv6 on this interface. 2308 */ 2309 if (dev->mtu < IPV6_MIN_MTU) 2310 addrconf_ifdown(dev, event != NETDEV_DOWN); 2311 } 2312 break; 2313 2314 case NETDEV_CHANGEMTU: 2315 if ( idev && dev->mtu >= IPV6_MIN_MTU) { 2316 rt6_mtu_change(dev, dev->mtu); 2317 idev->cnf.mtu6 = dev->mtu; 2318 break; 2319 } 2320 2321 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2322 2323 case NETDEV_DOWN: 2324 case NETDEV_UNREGISTER: 2325 /* 2326 * Remove all addresses from this interface. 2327 */ 2328 addrconf_ifdown(dev, event != NETDEV_DOWN); 2329 break; 2330 2331 case NETDEV_CHANGENAME: 2332 #ifdef CONFIG_SYSCTL 2333 if (idev) { 2334 addrconf_sysctl_unregister(&idev->cnf); 2335 neigh_sysctl_unregister(idev->nd_parms); 2336 neigh_sysctl_register(dev, idev->nd_parms, 2337 NET_IPV6, NET_IPV6_NEIGH, "ipv6", 2338 &ndisc_ifinfo_sysctl_change, 2339 NULL); 2340 addrconf_sysctl_register(idev, &idev->cnf); 2341 } 2342 #endif 2343 break; 2344 }; 2345 2346 return NOTIFY_OK; 2347 } 2348 2349 /* 2350 * addrconf module should be notified of a device going up 2351 */ 2352 static struct notifier_block ipv6_dev_notf = { 2353 .notifier_call = addrconf_notify, 2354 .priority = 0 2355 }; 2356 2357 static int addrconf_ifdown(struct net_device *dev, int how) 2358 { 2359 struct inet6_dev *idev; 2360 struct inet6_ifaddr *ifa, **bifa; 2361 int i; 2362 2363 ASSERT_RTNL(); 2364 2365 if (dev == &loopback_dev && how == 1) 2366 how = 0; 2367 2368 rt6_ifdown(dev); 2369 neigh_ifdown(&nd_tbl, dev); 2370 2371 idev = __in6_dev_get(dev); 2372 if (idev == NULL) 2373 return -ENODEV; 2374 2375 /* Step 1: remove reference to ipv6 device from parent device. 2376 Do not dev_put! 2377 */ 2378 if (how == 1) { 2379 idev->dead = 1; 2380 2381 /* protected by rtnl_lock */ 2382 rcu_assign_pointer(dev->ip6_ptr, NULL); 2383 2384 /* Step 1.5: remove snmp6 entry */ 2385 snmp6_unregister_dev(idev); 2386 2387 } 2388 2389 /* Step 2: clear hash table */ 2390 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2391 bifa = &inet6_addr_lst[i]; 2392 2393 write_lock_bh(&addrconf_hash_lock); 2394 while ((ifa = *bifa) != NULL) { 2395 if (ifa->idev == idev) { 2396 *bifa = ifa->lst_next; 2397 ifa->lst_next = NULL; 2398 addrconf_del_timer(ifa); 2399 in6_ifa_put(ifa); 2400 continue; 2401 } 2402 bifa = &ifa->lst_next; 2403 } 2404 write_unlock_bh(&addrconf_hash_lock); 2405 } 2406 2407 write_lock_bh(&idev->lock); 2408 2409 /* Step 3: clear flags for stateless addrconf */ 2410 if (how != 1) 2411 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2412 2413 /* Step 4: clear address list */ 2414 #ifdef CONFIG_IPV6_PRIVACY 2415 if (how == 1 && del_timer(&idev->regen_timer)) 2416 in6_dev_put(idev); 2417 2418 /* clear tempaddr list */ 2419 while ((ifa = idev->tempaddr_list) != NULL) { 2420 idev->tempaddr_list = ifa->tmp_next; 2421 ifa->tmp_next = NULL; 2422 ifa->dead = 1; 2423 write_unlock_bh(&idev->lock); 2424 spin_lock_bh(&ifa->lock); 2425 2426 if (ifa->ifpub) { 2427 in6_ifa_put(ifa->ifpub); 2428 ifa->ifpub = NULL; 2429 } 2430 spin_unlock_bh(&ifa->lock); 2431 in6_ifa_put(ifa); 2432 write_lock_bh(&idev->lock); 2433 } 2434 #endif 2435 while ((ifa = idev->addr_list) != NULL) { 2436 idev->addr_list = ifa->if_next; 2437 ifa->if_next = NULL; 2438 ifa->dead = 1; 2439 addrconf_del_timer(ifa); 2440 write_unlock_bh(&idev->lock); 2441 2442 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2443 in6_ifa_put(ifa); 2444 2445 write_lock_bh(&idev->lock); 2446 } 2447 write_unlock_bh(&idev->lock); 2448 2449 /* Step 5: Discard multicast list */ 2450 2451 if (how == 1) 2452 ipv6_mc_destroy_dev(idev); 2453 else 2454 ipv6_mc_down(idev); 2455 2456 /* Step 5: netlink notification of this interface */ 2457 idev->tstamp = jiffies; 2458 inet6_ifinfo_notify(RTM_DELLINK, idev); 2459 2460 /* Shot the device (if unregistered) */ 2461 2462 if (how == 1) { 2463 #ifdef CONFIG_SYSCTL 2464 addrconf_sysctl_unregister(&idev->cnf); 2465 neigh_sysctl_unregister(idev->nd_parms); 2466 #endif 2467 neigh_parms_release(&nd_tbl, idev->nd_parms); 2468 neigh_ifdown(&nd_tbl, dev); 2469 in6_dev_put(idev); 2470 } 2471 return 0; 2472 } 2473 2474 static void addrconf_rs_timer(unsigned long data) 2475 { 2476 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2477 2478 if (ifp->idev->cnf.forwarding) 2479 goto out; 2480 2481 if (ifp->idev->if_flags & IF_RA_RCVD) { 2482 /* 2483 * Announcement received after solicitation 2484 * was sent 2485 */ 2486 goto out; 2487 } 2488 2489 spin_lock(&ifp->lock); 2490 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2491 struct in6_addr all_routers; 2492 2493 /* The wait after the last probe can be shorter */ 2494 addrconf_mod_timer(ifp, AC_RS, 2495 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2496 ifp->idev->cnf.rtr_solicit_delay : 2497 ifp->idev->cnf.rtr_solicit_interval); 2498 spin_unlock(&ifp->lock); 2499 2500 ipv6_addr_all_routers(&all_routers); 2501 2502 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2503 } else { 2504 spin_unlock(&ifp->lock); 2505 /* 2506 * Note: we do not support deprecated "all on-link" 2507 * assumption any longer. 2508 */ 2509 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2510 ifp->idev->dev->name); 2511 } 2512 2513 out: 2514 in6_ifa_put(ifp); 2515 } 2516 2517 /* 2518 * Duplicate Address Detection 2519 */ 2520 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2521 { 2522 unsigned long rand_num; 2523 struct inet6_dev *idev = ifp->idev; 2524 2525 if (ifp->flags & IFA_F_OPTIMISTIC) 2526 rand_num = 0; 2527 else 2528 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2529 2530 ifp->probes = idev->cnf.dad_transmits; 2531 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2532 } 2533 2534 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2535 { 2536 struct inet6_dev *idev = ifp->idev; 2537 struct net_device *dev = idev->dev; 2538 2539 addrconf_join_solict(dev, &ifp->addr); 2540 2541 net_srandom(ifp->addr.s6_addr32[3]); 2542 2543 read_lock_bh(&idev->lock); 2544 if (ifp->dead) 2545 goto out; 2546 spin_lock_bh(&ifp->lock); 2547 2548 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2549 !(ifp->flags&IFA_F_TENTATIVE) || 2550 ifp->flags & IFA_F_NODAD) { 2551 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2552 spin_unlock_bh(&ifp->lock); 2553 read_unlock_bh(&idev->lock); 2554 2555 addrconf_dad_completed(ifp); 2556 return; 2557 } 2558 2559 if (!(idev->if_flags & IF_READY)) { 2560 spin_unlock_bh(&ifp->lock); 2561 read_unlock_bh(&idev->lock); 2562 /* 2563 * If the defice is not ready: 2564 * - keep it tentative if it is a permanent address. 2565 * - otherwise, kill it. 2566 */ 2567 in6_ifa_hold(ifp); 2568 addrconf_dad_stop(ifp); 2569 return; 2570 } 2571 2572 /* 2573 * Optimistic nodes can start receiving 2574 * Frames right away 2575 */ 2576 if(ifp->flags & IFA_F_OPTIMISTIC) 2577 ip6_ins_rt(ifp->rt); 2578 2579 addrconf_dad_kick(ifp); 2580 spin_unlock_bh(&ifp->lock); 2581 out: 2582 read_unlock_bh(&idev->lock); 2583 } 2584 2585 static void addrconf_dad_timer(unsigned long data) 2586 { 2587 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2588 struct inet6_dev *idev = ifp->idev; 2589 struct in6_addr unspec; 2590 struct in6_addr mcaddr; 2591 2592 read_lock_bh(&idev->lock); 2593 if (idev->dead) { 2594 read_unlock_bh(&idev->lock); 2595 goto out; 2596 } 2597 spin_lock_bh(&ifp->lock); 2598 if (ifp->probes == 0) { 2599 /* 2600 * DAD was successful 2601 */ 2602 2603 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2604 spin_unlock_bh(&ifp->lock); 2605 read_unlock_bh(&idev->lock); 2606 2607 addrconf_dad_completed(ifp); 2608 2609 goto out; 2610 } 2611 2612 ifp->probes--; 2613 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2614 spin_unlock_bh(&ifp->lock); 2615 read_unlock_bh(&idev->lock); 2616 2617 /* send a neighbour solicitation for our addr */ 2618 memset(&unspec, 0, sizeof(unspec)); 2619 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2620 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2621 out: 2622 in6_ifa_put(ifp); 2623 } 2624 2625 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2626 { 2627 struct net_device * dev = ifp->idev->dev; 2628 2629 /* 2630 * Configure the address for reception. Now it is valid. 2631 */ 2632 2633 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2634 2635 /* If added prefix is link local and forwarding is off, 2636 start sending router solicitations. 2637 */ 2638 2639 if (ifp->idev->cnf.forwarding == 0 && 2640 ifp->idev->cnf.rtr_solicits > 0 && 2641 (dev->flags&IFF_LOOPBACK) == 0 && 2642 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2643 struct in6_addr all_routers; 2644 2645 ipv6_addr_all_routers(&all_routers); 2646 2647 /* 2648 * If a host as already performed a random delay 2649 * [...] as part of DAD [...] there is no need 2650 * to delay again before sending the first RS 2651 */ 2652 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2653 2654 spin_lock_bh(&ifp->lock); 2655 ifp->probes = 1; 2656 ifp->idev->if_flags |= IF_RS_SENT; 2657 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2658 spin_unlock_bh(&ifp->lock); 2659 } 2660 } 2661 2662 static void addrconf_dad_run(struct inet6_dev *idev) { 2663 struct inet6_ifaddr *ifp; 2664 2665 read_lock_bh(&idev->lock); 2666 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2667 spin_lock_bh(&ifp->lock); 2668 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2669 spin_unlock_bh(&ifp->lock); 2670 continue; 2671 } 2672 spin_unlock_bh(&ifp->lock); 2673 addrconf_dad_kick(ifp); 2674 } 2675 read_unlock_bh(&idev->lock); 2676 } 2677 2678 #ifdef CONFIG_PROC_FS 2679 struct if6_iter_state { 2680 int bucket; 2681 }; 2682 2683 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2684 { 2685 struct inet6_ifaddr *ifa = NULL; 2686 struct if6_iter_state *state = seq->private; 2687 2688 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2689 ifa = inet6_addr_lst[state->bucket]; 2690 if (ifa) 2691 break; 2692 } 2693 return ifa; 2694 } 2695 2696 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2697 { 2698 struct if6_iter_state *state = seq->private; 2699 2700 ifa = ifa->lst_next; 2701 try_again: 2702 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2703 ifa = inet6_addr_lst[state->bucket]; 2704 goto try_again; 2705 } 2706 return ifa; 2707 } 2708 2709 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2710 { 2711 struct inet6_ifaddr *ifa = if6_get_first(seq); 2712 2713 if (ifa) 2714 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2715 --pos; 2716 return pos ? NULL : ifa; 2717 } 2718 2719 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2720 { 2721 read_lock_bh(&addrconf_hash_lock); 2722 return if6_get_idx(seq, *pos); 2723 } 2724 2725 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2726 { 2727 struct inet6_ifaddr *ifa; 2728 2729 ifa = if6_get_next(seq, v); 2730 ++*pos; 2731 return ifa; 2732 } 2733 2734 static void if6_seq_stop(struct seq_file *seq, void *v) 2735 { 2736 read_unlock_bh(&addrconf_hash_lock); 2737 } 2738 2739 static int if6_seq_show(struct seq_file *seq, void *v) 2740 { 2741 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2742 seq_printf(seq, 2743 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2744 NIP6(ifp->addr), 2745 ifp->idev->dev->ifindex, 2746 ifp->prefix_len, 2747 ifp->scope, 2748 ifp->flags, 2749 ifp->idev->dev->name); 2750 return 0; 2751 } 2752 2753 static struct seq_operations if6_seq_ops = { 2754 .start = if6_seq_start, 2755 .next = if6_seq_next, 2756 .show = if6_seq_show, 2757 .stop = if6_seq_stop, 2758 }; 2759 2760 static int if6_seq_open(struct inode *inode, struct file *file) 2761 { 2762 struct seq_file *seq; 2763 int rc = -ENOMEM; 2764 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2765 2766 if (!s) 2767 goto out; 2768 2769 rc = seq_open(file, &if6_seq_ops); 2770 if (rc) 2771 goto out_kfree; 2772 2773 seq = file->private_data; 2774 seq->private = s; 2775 out: 2776 return rc; 2777 out_kfree: 2778 kfree(s); 2779 goto out; 2780 } 2781 2782 static const struct file_operations if6_fops = { 2783 .owner = THIS_MODULE, 2784 .open = if6_seq_open, 2785 .read = seq_read, 2786 .llseek = seq_lseek, 2787 .release = seq_release_private, 2788 }; 2789 2790 int __init if6_proc_init(void) 2791 { 2792 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops)) 2793 return -ENOMEM; 2794 return 0; 2795 } 2796 2797 void if6_proc_exit(void) 2798 { 2799 proc_net_remove("if_inet6"); 2800 } 2801 #endif /* CONFIG_PROC_FS */ 2802 2803 #ifdef CONFIG_IPV6_MIP6 2804 /* Check if address is a home address configured on any interface. */ 2805 int ipv6_chk_home_addr(struct in6_addr *addr) 2806 { 2807 int ret = 0; 2808 struct inet6_ifaddr * ifp; 2809 u8 hash = ipv6_addr_hash(addr); 2810 read_lock_bh(&addrconf_hash_lock); 2811 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2812 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 && 2813 (ifp->flags & IFA_F_HOMEADDRESS)) { 2814 ret = 1; 2815 break; 2816 } 2817 } 2818 read_unlock_bh(&addrconf_hash_lock); 2819 return ret; 2820 } 2821 #endif 2822 2823 /* 2824 * Periodic address status verification 2825 */ 2826 2827 static void addrconf_verify(unsigned long foo) 2828 { 2829 struct inet6_ifaddr *ifp; 2830 unsigned long now, next; 2831 int i; 2832 2833 spin_lock_bh(&addrconf_verify_lock); 2834 now = jiffies; 2835 next = now + ADDR_CHECK_FREQUENCY; 2836 2837 del_timer(&addr_chk_timer); 2838 2839 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2840 2841 restart: 2842 read_lock(&addrconf_hash_lock); 2843 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2844 unsigned long age; 2845 #ifdef CONFIG_IPV6_PRIVACY 2846 unsigned long regen_advance; 2847 #endif 2848 2849 if (ifp->flags & IFA_F_PERMANENT) 2850 continue; 2851 2852 spin_lock(&ifp->lock); 2853 age = (now - ifp->tstamp) / HZ; 2854 2855 #ifdef CONFIG_IPV6_PRIVACY 2856 regen_advance = ifp->idev->cnf.regen_max_retry * 2857 ifp->idev->cnf.dad_transmits * 2858 ifp->idev->nd_parms->retrans_time / HZ; 2859 #endif 2860 2861 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2862 age >= ifp->valid_lft) { 2863 spin_unlock(&ifp->lock); 2864 in6_ifa_hold(ifp); 2865 read_unlock(&addrconf_hash_lock); 2866 ipv6_del_addr(ifp); 2867 goto restart; 2868 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2869 spin_unlock(&ifp->lock); 2870 continue; 2871 } else if (age >= ifp->prefered_lft) { 2872 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2873 int deprecate = 0; 2874 2875 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2876 deprecate = 1; 2877 ifp->flags |= IFA_F_DEPRECATED; 2878 } 2879 2880 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2881 next = ifp->tstamp + ifp->valid_lft * HZ; 2882 2883 spin_unlock(&ifp->lock); 2884 2885 if (deprecate) { 2886 in6_ifa_hold(ifp); 2887 read_unlock(&addrconf_hash_lock); 2888 2889 ipv6_ifa_notify(0, ifp); 2890 in6_ifa_put(ifp); 2891 goto restart; 2892 } 2893 #ifdef CONFIG_IPV6_PRIVACY 2894 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2895 !(ifp->flags&IFA_F_TENTATIVE)) { 2896 if (age >= ifp->prefered_lft - regen_advance) { 2897 struct inet6_ifaddr *ifpub = ifp->ifpub; 2898 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2899 next = ifp->tstamp + ifp->prefered_lft * HZ; 2900 if (!ifp->regen_count && ifpub) { 2901 ifp->regen_count++; 2902 in6_ifa_hold(ifp); 2903 in6_ifa_hold(ifpub); 2904 spin_unlock(&ifp->lock); 2905 read_unlock(&addrconf_hash_lock); 2906 spin_lock(&ifpub->lock); 2907 ifpub->regen_count = 0; 2908 spin_unlock(&ifpub->lock); 2909 ipv6_create_tempaddr(ifpub, ifp); 2910 in6_ifa_put(ifpub); 2911 in6_ifa_put(ifp); 2912 goto restart; 2913 } 2914 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2915 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2916 spin_unlock(&ifp->lock); 2917 #endif 2918 } else { 2919 /* ifp->prefered_lft <= ifp->valid_lft */ 2920 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2921 next = ifp->tstamp + ifp->prefered_lft * HZ; 2922 spin_unlock(&ifp->lock); 2923 } 2924 } 2925 read_unlock(&addrconf_hash_lock); 2926 } 2927 2928 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2929 add_timer(&addr_chk_timer); 2930 spin_unlock_bh(&addrconf_verify_lock); 2931 } 2932 2933 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 2934 { 2935 struct in6_addr *pfx = NULL; 2936 2937 if (addr) 2938 pfx = nla_data(addr); 2939 2940 if (local) { 2941 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 2942 pfx = NULL; 2943 else 2944 pfx = nla_data(local); 2945 } 2946 2947 return pfx; 2948 } 2949 2950 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = { 2951 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 2952 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 2953 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 2954 }; 2955 2956 static int 2957 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2958 { 2959 struct ifaddrmsg *ifm; 2960 struct nlattr *tb[IFA_MAX+1]; 2961 struct in6_addr *pfx; 2962 int err; 2963 2964 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 2965 if (err < 0) 2966 return err; 2967 2968 ifm = nlmsg_data(nlh); 2969 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 2970 if (pfx == NULL) 2971 return -EINVAL; 2972 2973 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 2974 } 2975 2976 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 2977 u32 prefered_lft, u32 valid_lft) 2978 { 2979 u32 flags = RTF_EXPIRES; 2980 2981 if (!valid_lft || (prefered_lft > valid_lft)) 2982 return -EINVAL; 2983 2984 if (valid_lft == INFINITY_LIFE_TIME) { 2985 ifa_flags |= IFA_F_PERMANENT; 2986 flags = 0; 2987 } else if (valid_lft >= 0x7FFFFFFF/HZ) 2988 valid_lft = 0x7FFFFFFF/HZ; 2989 2990 if (prefered_lft == 0) 2991 ifa_flags |= IFA_F_DEPRECATED; 2992 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 2993 (prefered_lft != INFINITY_LIFE_TIME)) 2994 prefered_lft = 0x7FFFFFFF/HZ; 2995 2996 spin_lock_bh(&ifp->lock); 2997 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 2998 ifp->tstamp = jiffies; 2999 ifp->valid_lft = valid_lft; 3000 ifp->prefered_lft = prefered_lft; 3001 3002 spin_unlock_bh(&ifp->lock); 3003 if (!(ifp->flags&IFA_F_TENTATIVE)) 3004 ipv6_ifa_notify(0, ifp); 3005 3006 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3007 jiffies_to_clock_t(valid_lft * HZ), flags); 3008 addrconf_verify(0); 3009 3010 return 0; 3011 } 3012 3013 static int 3014 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3015 { 3016 struct ifaddrmsg *ifm; 3017 struct nlattr *tb[IFA_MAX+1]; 3018 struct in6_addr *pfx; 3019 struct inet6_ifaddr *ifa; 3020 struct net_device *dev; 3021 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3022 u8 ifa_flags; 3023 int err; 3024 3025 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3026 if (err < 0) 3027 return err; 3028 3029 ifm = nlmsg_data(nlh); 3030 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3031 if (pfx == NULL) 3032 return -EINVAL; 3033 3034 if (tb[IFA_CACHEINFO]) { 3035 struct ifa_cacheinfo *ci; 3036 3037 ci = nla_data(tb[IFA_CACHEINFO]); 3038 valid_lft = ci->ifa_valid; 3039 preferred_lft = ci->ifa_prefered; 3040 } else { 3041 preferred_lft = INFINITY_LIFE_TIME; 3042 valid_lft = INFINITY_LIFE_TIME; 3043 } 3044 3045 dev = __dev_get_by_index(ifm->ifa_index); 3046 if (dev == NULL) 3047 return -ENODEV; 3048 3049 /* We ignore other flags so far. */ 3050 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3051 3052 ifa = ipv6_get_ifaddr(pfx, dev, 1); 3053 if (ifa == NULL) { 3054 /* 3055 * It would be best to check for !NLM_F_CREATE here but 3056 * userspace alreay relies on not having to provide this. 3057 */ 3058 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 3059 ifa_flags, preferred_lft, valid_lft); 3060 } 3061 3062 if (nlh->nlmsg_flags & NLM_F_EXCL || 3063 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3064 err = -EEXIST; 3065 else 3066 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3067 3068 in6_ifa_put(ifa); 3069 3070 return err; 3071 } 3072 3073 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3074 u8 scope, int ifindex) 3075 { 3076 struct ifaddrmsg *ifm; 3077 3078 ifm = nlmsg_data(nlh); 3079 ifm->ifa_family = AF_INET6; 3080 ifm->ifa_prefixlen = prefixlen; 3081 ifm->ifa_flags = flags; 3082 ifm->ifa_scope = scope; 3083 ifm->ifa_index = ifindex; 3084 } 3085 3086 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3087 unsigned long tstamp, u32 preferred, u32 valid) 3088 { 3089 struct ifa_cacheinfo ci; 3090 3091 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3092 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3093 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3094 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3095 ci.ifa_prefered = preferred; 3096 ci.ifa_valid = valid; 3097 3098 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3099 } 3100 3101 static inline int rt_scope(int ifa_scope) 3102 { 3103 if (ifa_scope & IFA_HOST) 3104 return RT_SCOPE_HOST; 3105 else if (ifa_scope & IFA_LINK) 3106 return RT_SCOPE_LINK; 3107 else if (ifa_scope & IFA_SITE) 3108 return RT_SCOPE_SITE; 3109 else 3110 return RT_SCOPE_UNIVERSE; 3111 } 3112 3113 static inline int inet6_ifaddr_msgsize(void) 3114 { 3115 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3116 + nla_total_size(16) /* IFA_ADDRESS */ 3117 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3118 } 3119 3120 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3121 u32 pid, u32 seq, int event, unsigned int flags) 3122 { 3123 struct nlmsghdr *nlh; 3124 u32 preferred, valid; 3125 3126 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3127 if (nlh == NULL) 3128 return -EMSGSIZE; 3129 3130 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3131 ifa->idev->dev->ifindex); 3132 3133 if (!(ifa->flags&IFA_F_PERMANENT)) { 3134 preferred = ifa->prefered_lft; 3135 valid = ifa->valid_lft; 3136 if (preferred != INFINITY_LIFE_TIME) { 3137 long tval = (jiffies - ifa->tstamp)/HZ; 3138 preferred -= tval; 3139 if (valid != INFINITY_LIFE_TIME) 3140 valid -= tval; 3141 } 3142 } else { 3143 preferred = INFINITY_LIFE_TIME; 3144 valid = INFINITY_LIFE_TIME; 3145 } 3146 3147 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3148 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3149 nlmsg_cancel(skb, nlh); 3150 return -EMSGSIZE; 3151 } 3152 3153 return nlmsg_end(skb, nlh); 3154 } 3155 3156 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3157 u32 pid, u32 seq, int event, u16 flags) 3158 { 3159 struct nlmsghdr *nlh; 3160 u8 scope = RT_SCOPE_UNIVERSE; 3161 int ifindex = ifmca->idev->dev->ifindex; 3162 3163 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3164 scope = RT_SCOPE_SITE; 3165 3166 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3167 if (nlh == NULL) 3168 return -EMSGSIZE; 3169 3170 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3171 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3172 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3173 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3174 nlmsg_cancel(skb, nlh); 3175 return -EMSGSIZE; 3176 } 3177 3178 return nlmsg_end(skb, nlh); 3179 } 3180 3181 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3182 u32 pid, u32 seq, int event, unsigned int flags) 3183 { 3184 struct nlmsghdr *nlh; 3185 u8 scope = RT_SCOPE_UNIVERSE; 3186 int ifindex = ifaca->aca_idev->dev->ifindex; 3187 3188 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3189 scope = RT_SCOPE_SITE; 3190 3191 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3192 if (nlh == NULL) 3193 return -EMSGSIZE; 3194 3195 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3196 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3197 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3198 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3199 nlmsg_cancel(skb, nlh); 3200 return -EMSGSIZE; 3201 } 3202 3203 return nlmsg_end(skb, nlh); 3204 } 3205 3206 enum addr_type_t 3207 { 3208 UNICAST_ADDR, 3209 MULTICAST_ADDR, 3210 ANYCAST_ADDR, 3211 }; 3212 3213 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3214 enum addr_type_t type) 3215 { 3216 int idx, ip_idx; 3217 int s_idx, s_ip_idx; 3218 int err = 1; 3219 struct net_device *dev; 3220 struct inet6_dev *idev = NULL; 3221 struct inet6_ifaddr *ifa; 3222 struct ifmcaddr6 *ifmca; 3223 struct ifacaddr6 *ifaca; 3224 3225 s_idx = cb->args[0]; 3226 s_ip_idx = ip_idx = cb->args[1]; 3227 read_lock(&dev_base_lock); 3228 3229 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { 3230 if (idx < s_idx) 3231 continue; 3232 if (idx > s_idx) 3233 s_ip_idx = 0; 3234 ip_idx = 0; 3235 if ((idev = in6_dev_get(dev)) == NULL) 3236 continue; 3237 read_lock_bh(&idev->lock); 3238 switch (type) { 3239 case UNICAST_ADDR: 3240 /* unicast address incl. temp addr */ 3241 for (ifa = idev->addr_list; ifa; 3242 ifa = ifa->if_next, ip_idx++) { 3243 if (ip_idx < s_ip_idx) 3244 continue; 3245 if ((err = inet6_fill_ifaddr(skb, ifa, 3246 NETLINK_CB(cb->skb).pid, 3247 cb->nlh->nlmsg_seq, RTM_NEWADDR, 3248 NLM_F_MULTI)) <= 0) 3249 goto done; 3250 } 3251 break; 3252 case MULTICAST_ADDR: 3253 /* multicast address */ 3254 for (ifmca = idev->mc_list; ifmca; 3255 ifmca = ifmca->next, ip_idx++) { 3256 if (ip_idx < s_ip_idx) 3257 continue; 3258 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 3259 NETLINK_CB(cb->skb).pid, 3260 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 3261 NLM_F_MULTI)) <= 0) 3262 goto done; 3263 } 3264 break; 3265 case ANYCAST_ADDR: 3266 /* anycast address */ 3267 for (ifaca = idev->ac_list; ifaca; 3268 ifaca = ifaca->aca_next, ip_idx++) { 3269 if (ip_idx < s_ip_idx) 3270 continue; 3271 if ((err = inet6_fill_ifacaddr(skb, ifaca, 3272 NETLINK_CB(cb->skb).pid, 3273 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 3274 NLM_F_MULTI)) <= 0) 3275 goto done; 3276 } 3277 break; 3278 default: 3279 break; 3280 } 3281 read_unlock_bh(&idev->lock); 3282 in6_dev_put(idev); 3283 } 3284 done: 3285 if (err <= 0) { 3286 read_unlock_bh(&idev->lock); 3287 in6_dev_put(idev); 3288 } 3289 read_unlock(&dev_base_lock); 3290 cb->args[0] = idx; 3291 cb->args[1] = ip_idx; 3292 return skb->len; 3293 } 3294 3295 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3296 { 3297 enum addr_type_t type = UNICAST_ADDR; 3298 return inet6_dump_addr(skb, cb, type); 3299 } 3300 3301 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3302 { 3303 enum addr_type_t type = MULTICAST_ADDR; 3304 return inet6_dump_addr(skb, cb, type); 3305 } 3306 3307 3308 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3309 { 3310 enum addr_type_t type = ANYCAST_ADDR; 3311 return inet6_dump_addr(skb, cb, type); 3312 } 3313 3314 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3315 void *arg) 3316 { 3317 struct ifaddrmsg *ifm; 3318 struct nlattr *tb[IFA_MAX+1]; 3319 struct in6_addr *addr = NULL; 3320 struct net_device *dev = NULL; 3321 struct inet6_ifaddr *ifa; 3322 struct sk_buff *skb; 3323 int err; 3324 3325 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3326 if (err < 0) 3327 goto errout; 3328 3329 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3330 if (addr == NULL) { 3331 err = -EINVAL; 3332 goto errout; 3333 } 3334 3335 ifm = nlmsg_data(nlh); 3336 if (ifm->ifa_index) 3337 dev = __dev_get_by_index(ifm->ifa_index); 3338 3339 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) { 3340 err = -EADDRNOTAVAIL; 3341 goto errout; 3342 } 3343 3344 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3345 err = -ENOBUFS; 3346 goto errout_ifa; 3347 } 3348 3349 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3350 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3351 if (err < 0) { 3352 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3353 WARN_ON(err == -EMSGSIZE); 3354 kfree_skb(skb); 3355 goto errout_ifa; 3356 } 3357 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); 3358 errout_ifa: 3359 in6_ifa_put(ifa); 3360 errout: 3361 return err; 3362 } 3363 3364 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3365 { 3366 struct sk_buff *skb; 3367 int err = -ENOBUFS; 3368 3369 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3370 if (skb == NULL) 3371 goto errout; 3372 3373 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3374 if (err < 0) { 3375 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3376 WARN_ON(err == -EMSGSIZE); 3377 kfree_skb(skb); 3378 goto errout; 3379 } 3380 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3381 errout: 3382 if (err < 0) 3383 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3384 } 3385 3386 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3387 __s32 *array, int bytes) 3388 { 3389 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3390 3391 memset(array, 0, bytes); 3392 array[DEVCONF_FORWARDING] = cnf->forwarding; 3393 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3394 array[DEVCONF_MTU6] = cnf->mtu6; 3395 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3396 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3397 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3398 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3399 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3400 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3401 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3402 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3403 #ifdef CONFIG_IPV6_PRIVACY 3404 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3405 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3406 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3407 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3408 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3409 #endif 3410 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3411 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3412 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3413 #ifdef CONFIG_IPV6_ROUTER_PREF 3414 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3415 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3416 #ifdef CONFIG_IPV6_ROUTE_INFO 3417 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3418 #endif 3419 #endif 3420 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3421 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3422 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3423 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3424 #endif 3425 } 3426 3427 static inline size_t inet6_if_nlmsg_size(void) 3428 { 3429 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3430 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3431 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3432 + nla_total_size(4) /* IFLA_MTU */ 3433 + nla_total_size(4) /* IFLA_LINK */ 3434 + nla_total_size( /* IFLA_PROTINFO */ 3435 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3436 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3437 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3438 ); 3439 } 3440 3441 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3442 u32 pid, u32 seq, int event, unsigned int flags) 3443 { 3444 struct net_device *dev = idev->dev; 3445 struct nlattr *conf; 3446 struct ifinfomsg *hdr; 3447 struct nlmsghdr *nlh; 3448 void *protoinfo; 3449 struct ifla_cacheinfo ci; 3450 3451 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3452 if (nlh == NULL) 3453 return -EMSGSIZE; 3454 3455 hdr = nlmsg_data(nlh); 3456 hdr->ifi_family = AF_INET6; 3457 hdr->__ifi_pad = 0; 3458 hdr->ifi_type = dev->type; 3459 hdr->ifi_index = dev->ifindex; 3460 hdr->ifi_flags = dev_get_flags(dev); 3461 hdr->ifi_change = 0; 3462 3463 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3464 3465 if (dev->addr_len) 3466 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3467 3468 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3469 if (dev->ifindex != dev->iflink) 3470 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3471 3472 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3473 if (protoinfo == NULL) 3474 goto nla_put_failure; 3475 3476 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3477 3478 ci.max_reasm_len = IPV6_MAXPLEN; 3479 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3480 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3481 ci.reachable_time = idev->nd_parms->reachable_time; 3482 ci.retrans_time = idev->nd_parms->retrans_time; 3483 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3484 3485 conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3486 if (conf == NULL) 3487 goto nla_put_failure; 3488 ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf)); 3489 3490 /* XXX - Statistics/MC not implemented */ 3491 3492 nla_nest_end(skb, protoinfo); 3493 return nlmsg_end(skb, nlh); 3494 3495 nla_put_failure: 3496 nlmsg_cancel(skb, nlh); 3497 return -EMSGSIZE; 3498 } 3499 3500 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3501 { 3502 int idx, err; 3503 int s_idx = cb->args[0]; 3504 struct net_device *dev; 3505 struct inet6_dev *idev; 3506 3507 read_lock(&dev_base_lock); 3508 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { 3509 if (idx < s_idx) 3510 continue; 3511 if ((idev = in6_dev_get(dev)) == NULL) 3512 continue; 3513 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3514 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3515 in6_dev_put(idev); 3516 if (err <= 0) 3517 break; 3518 } 3519 read_unlock(&dev_base_lock); 3520 cb->args[0] = idx; 3521 3522 return skb->len; 3523 } 3524 3525 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3526 { 3527 struct sk_buff *skb; 3528 int err = -ENOBUFS; 3529 3530 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3531 if (skb == NULL) 3532 goto errout; 3533 3534 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3535 if (err < 0) { 3536 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3537 WARN_ON(err == -EMSGSIZE); 3538 kfree_skb(skb); 3539 goto errout; 3540 } 3541 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3542 errout: 3543 if (err < 0) 3544 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3545 } 3546 3547 static inline size_t inet6_prefix_nlmsg_size(void) 3548 { 3549 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3550 + nla_total_size(sizeof(struct in6_addr)) 3551 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3552 } 3553 3554 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3555 struct prefix_info *pinfo, u32 pid, u32 seq, 3556 int event, unsigned int flags) 3557 { 3558 struct prefixmsg *pmsg; 3559 struct nlmsghdr *nlh; 3560 struct prefix_cacheinfo ci; 3561 3562 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3563 if (nlh == NULL) 3564 return -EMSGSIZE; 3565 3566 pmsg = nlmsg_data(nlh); 3567 pmsg->prefix_family = AF_INET6; 3568 pmsg->prefix_pad1 = 0; 3569 pmsg->prefix_pad2 = 0; 3570 pmsg->prefix_ifindex = idev->dev->ifindex; 3571 pmsg->prefix_len = pinfo->prefix_len; 3572 pmsg->prefix_type = pinfo->type; 3573 pmsg->prefix_pad3 = 0; 3574 pmsg->prefix_flags = 0; 3575 if (pinfo->onlink) 3576 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3577 if (pinfo->autoconf) 3578 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3579 3580 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3581 3582 ci.preferred_time = ntohl(pinfo->prefered); 3583 ci.valid_time = ntohl(pinfo->valid); 3584 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3585 3586 return nlmsg_end(skb, nlh); 3587 3588 nla_put_failure: 3589 nlmsg_cancel(skb, nlh); 3590 return -EMSGSIZE; 3591 } 3592 3593 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3594 struct prefix_info *pinfo) 3595 { 3596 struct sk_buff *skb; 3597 int err = -ENOBUFS; 3598 3599 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3600 if (skb == NULL) 3601 goto errout; 3602 3603 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3604 if (err < 0) { 3605 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3606 WARN_ON(err == -EMSGSIZE); 3607 kfree_skb(skb); 3608 goto errout; 3609 } 3610 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3611 errout: 3612 if (err < 0) 3613 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err); 3614 } 3615 3616 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = { 3617 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, }, 3618 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, }, 3619 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, }, 3620 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr, 3621 .dumpit = inet6_dump_ifaddr, }, 3622 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, }, 3623 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, }, 3624 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, }, 3625 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, }, 3626 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute, 3627 .dumpit = inet6_dump_fib, }, 3628 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3629 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, }, 3630 #endif 3631 }; 3632 3633 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3634 { 3635 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3636 3637 switch (event) { 3638 case RTM_NEWADDR: 3639 /* 3640 * If the address was optimistic 3641 * we inserted the route at the start of 3642 * our DAD process, so we don't need 3643 * to do it again 3644 */ 3645 if (!(ifp->rt->rt6i_node)) 3646 ip6_ins_rt(ifp->rt); 3647 if (ifp->idev->cnf.forwarding) 3648 addrconf_join_anycast(ifp); 3649 break; 3650 case RTM_DELADDR: 3651 if (ifp->idev->cnf.forwarding) 3652 addrconf_leave_anycast(ifp); 3653 addrconf_leave_solict(ifp->idev, &ifp->addr); 3654 dst_hold(&ifp->rt->u.dst); 3655 if (ip6_del_rt(ifp->rt)) 3656 dst_free(&ifp->rt->u.dst); 3657 break; 3658 } 3659 } 3660 3661 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3662 { 3663 rcu_read_lock_bh(); 3664 if (likely(ifp->idev->dead == 0)) 3665 __ipv6_ifa_notify(event, ifp); 3666 rcu_read_unlock_bh(); 3667 } 3668 3669 #ifdef CONFIG_SYSCTL 3670 3671 static 3672 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3673 void __user *buffer, size_t *lenp, loff_t *ppos) 3674 { 3675 int *valp = ctl->data; 3676 int val = *valp; 3677 int ret; 3678 3679 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3680 3681 if (write && valp != &ipv6_devconf_dflt.forwarding) { 3682 if (valp != &ipv6_devconf.forwarding) { 3683 if ((!*valp) ^ (!val)) { 3684 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 3685 if (idev == NULL) 3686 return ret; 3687 dev_forward_change(idev); 3688 } 3689 } else { 3690 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; 3691 addrconf_forward_change(); 3692 } 3693 if (*valp) 3694 rt6_purge_dflt_routers(); 3695 } 3696 3697 return ret; 3698 } 3699 3700 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3701 int __user *name, int nlen, 3702 void __user *oldval, 3703 size_t __user *oldlenp, 3704 void __user *newval, size_t newlen) 3705 { 3706 int *valp = table->data; 3707 int new; 3708 3709 if (!newval || !newlen) 3710 return 0; 3711 if (newlen != sizeof(int)) 3712 return -EINVAL; 3713 if (get_user(new, (int __user *)newval)) 3714 return -EFAULT; 3715 if (new == *valp) 3716 return 0; 3717 if (oldval && oldlenp) { 3718 size_t len; 3719 if (get_user(len, oldlenp)) 3720 return -EFAULT; 3721 if (len) { 3722 if (len > table->maxlen) 3723 len = table->maxlen; 3724 if (copy_to_user(oldval, valp, len)) 3725 return -EFAULT; 3726 if (put_user(len, oldlenp)) 3727 return -EFAULT; 3728 } 3729 } 3730 3731 if (valp != &ipv6_devconf_dflt.forwarding) { 3732 if (valp != &ipv6_devconf.forwarding) { 3733 struct inet6_dev *idev = (struct inet6_dev *)table->extra1; 3734 int changed; 3735 if (unlikely(idev == NULL)) 3736 return -ENODEV; 3737 changed = (!*valp) ^ (!new); 3738 *valp = new; 3739 if (changed) 3740 dev_forward_change(idev); 3741 } else { 3742 *valp = new; 3743 addrconf_forward_change(); 3744 } 3745 3746 if (*valp) 3747 rt6_purge_dflt_routers(); 3748 } else 3749 *valp = new; 3750 3751 return 1; 3752 } 3753 3754 static struct addrconf_sysctl_table 3755 { 3756 struct ctl_table_header *sysctl_header; 3757 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3758 ctl_table addrconf_dev[2]; 3759 ctl_table addrconf_conf_dir[2]; 3760 ctl_table addrconf_proto_dir[2]; 3761 ctl_table addrconf_root_dir[2]; 3762 } addrconf_sysctl __read_mostly = { 3763 .sysctl_header = NULL, 3764 .addrconf_vars = { 3765 { 3766 .ctl_name = NET_IPV6_FORWARDING, 3767 .procname = "forwarding", 3768 .data = &ipv6_devconf.forwarding, 3769 .maxlen = sizeof(int), 3770 .mode = 0644, 3771 .proc_handler = &addrconf_sysctl_forward, 3772 .strategy = &addrconf_sysctl_forward_strategy, 3773 }, 3774 { 3775 .ctl_name = NET_IPV6_HOP_LIMIT, 3776 .procname = "hop_limit", 3777 .data = &ipv6_devconf.hop_limit, 3778 .maxlen = sizeof(int), 3779 .mode = 0644, 3780 .proc_handler = proc_dointvec, 3781 }, 3782 { 3783 .ctl_name = NET_IPV6_MTU, 3784 .procname = "mtu", 3785 .data = &ipv6_devconf.mtu6, 3786 .maxlen = sizeof(int), 3787 .mode = 0644, 3788 .proc_handler = &proc_dointvec, 3789 }, 3790 { 3791 .ctl_name = NET_IPV6_ACCEPT_RA, 3792 .procname = "accept_ra", 3793 .data = &ipv6_devconf.accept_ra, 3794 .maxlen = sizeof(int), 3795 .mode = 0644, 3796 .proc_handler = &proc_dointvec, 3797 }, 3798 { 3799 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3800 .procname = "accept_redirects", 3801 .data = &ipv6_devconf.accept_redirects, 3802 .maxlen = sizeof(int), 3803 .mode = 0644, 3804 .proc_handler = &proc_dointvec, 3805 }, 3806 { 3807 .ctl_name = NET_IPV6_AUTOCONF, 3808 .procname = "autoconf", 3809 .data = &ipv6_devconf.autoconf, 3810 .maxlen = sizeof(int), 3811 .mode = 0644, 3812 .proc_handler = &proc_dointvec, 3813 }, 3814 { 3815 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3816 .procname = "dad_transmits", 3817 .data = &ipv6_devconf.dad_transmits, 3818 .maxlen = sizeof(int), 3819 .mode = 0644, 3820 .proc_handler = &proc_dointvec, 3821 }, 3822 { 3823 .ctl_name = NET_IPV6_RTR_SOLICITS, 3824 .procname = "router_solicitations", 3825 .data = &ipv6_devconf.rtr_solicits, 3826 .maxlen = sizeof(int), 3827 .mode = 0644, 3828 .proc_handler = &proc_dointvec, 3829 }, 3830 { 3831 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3832 .procname = "router_solicitation_interval", 3833 .data = &ipv6_devconf.rtr_solicit_interval, 3834 .maxlen = sizeof(int), 3835 .mode = 0644, 3836 .proc_handler = &proc_dointvec_jiffies, 3837 .strategy = &sysctl_jiffies, 3838 }, 3839 { 3840 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3841 .procname = "router_solicitation_delay", 3842 .data = &ipv6_devconf.rtr_solicit_delay, 3843 .maxlen = sizeof(int), 3844 .mode = 0644, 3845 .proc_handler = &proc_dointvec_jiffies, 3846 .strategy = &sysctl_jiffies, 3847 }, 3848 { 3849 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3850 .procname = "force_mld_version", 3851 .data = &ipv6_devconf.force_mld_version, 3852 .maxlen = sizeof(int), 3853 .mode = 0644, 3854 .proc_handler = &proc_dointvec, 3855 }, 3856 #ifdef CONFIG_IPV6_PRIVACY 3857 { 3858 .ctl_name = NET_IPV6_USE_TEMPADDR, 3859 .procname = "use_tempaddr", 3860 .data = &ipv6_devconf.use_tempaddr, 3861 .maxlen = sizeof(int), 3862 .mode = 0644, 3863 .proc_handler = &proc_dointvec, 3864 }, 3865 { 3866 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3867 .procname = "temp_valid_lft", 3868 .data = &ipv6_devconf.temp_valid_lft, 3869 .maxlen = sizeof(int), 3870 .mode = 0644, 3871 .proc_handler = &proc_dointvec, 3872 }, 3873 { 3874 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3875 .procname = "temp_prefered_lft", 3876 .data = &ipv6_devconf.temp_prefered_lft, 3877 .maxlen = sizeof(int), 3878 .mode = 0644, 3879 .proc_handler = &proc_dointvec, 3880 }, 3881 { 3882 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3883 .procname = "regen_max_retry", 3884 .data = &ipv6_devconf.regen_max_retry, 3885 .maxlen = sizeof(int), 3886 .mode = 0644, 3887 .proc_handler = &proc_dointvec, 3888 }, 3889 { 3890 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3891 .procname = "max_desync_factor", 3892 .data = &ipv6_devconf.max_desync_factor, 3893 .maxlen = sizeof(int), 3894 .mode = 0644, 3895 .proc_handler = &proc_dointvec, 3896 }, 3897 #endif 3898 { 3899 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3900 .procname = "max_addresses", 3901 .data = &ipv6_devconf.max_addresses, 3902 .maxlen = sizeof(int), 3903 .mode = 0644, 3904 .proc_handler = &proc_dointvec, 3905 }, 3906 { 3907 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 3908 .procname = "accept_ra_defrtr", 3909 .data = &ipv6_devconf.accept_ra_defrtr, 3910 .maxlen = sizeof(int), 3911 .mode = 0644, 3912 .proc_handler = &proc_dointvec, 3913 }, 3914 { 3915 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 3916 .procname = "accept_ra_pinfo", 3917 .data = &ipv6_devconf.accept_ra_pinfo, 3918 .maxlen = sizeof(int), 3919 .mode = 0644, 3920 .proc_handler = &proc_dointvec, 3921 }, 3922 #ifdef CONFIG_IPV6_ROUTER_PREF 3923 { 3924 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 3925 .procname = "accept_ra_rtr_pref", 3926 .data = &ipv6_devconf.accept_ra_rtr_pref, 3927 .maxlen = sizeof(int), 3928 .mode = 0644, 3929 .proc_handler = &proc_dointvec, 3930 }, 3931 { 3932 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 3933 .procname = "router_probe_interval", 3934 .data = &ipv6_devconf.rtr_probe_interval, 3935 .maxlen = sizeof(int), 3936 .mode = 0644, 3937 .proc_handler = &proc_dointvec_jiffies, 3938 .strategy = &sysctl_jiffies, 3939 }, 3940 #ifdef CONFIG_IPV6_ROUTE_INFO 3941 { 3942 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 3943 .procname = "accept_ra_rt_info_max_plen", 3944 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 3945 .maxlen = sizeof(int), 3946 .mode = 0644, 3947 .proc_handler = &proc_dointvec, 3948 }, 3949 #endif 3950 #endif 3951 { 3952 .ctl_name = NET_IPV6_PROXY_NDP, 3953 .procname = "proxy_ndp", 3954 .data = &ipv6_devconf.proxy_ndp, 3955 .maxlen = sizeof(int), 3956 .mode = 0644, 3957 .proc_handler = &proc_dointvec, 3958 }, 3959 { 3960 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 3961 .procname = "accept_source_route", 3962 .data = &ipv6_devconf.accept_source_route, 3963 .maxlen = sizeof(int), 3964 .mode = 0644, 3965 .proc_handler = &proc_dointvec, 3966 }, 3967 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3968 { 3969 .ctl_name = CTL_UNNUMBERED, 3970 .procname = "optimistic_dad", 3971 .data = &ipv6_devconf.optimistic_dad, 3972 .maxlen = sizeof(int), 3973 .mode = 0644, 3974 .proc_handler = &proc_dointvec, 3975 3976 }, 3977 #endif 3978 { 3979 .ctl_name = 0, /* sentinel */ 3980 } 3981 }, 3982 .addrconf_dev = { 3983 { 3984 .ctl_name = NET_PROTO_CONF_ALL, 3985 .procname = "all", 3986 .mode = 0555, 3987 .child = addrconf_sysctl.addrconf_vars, 3988 }, 3989 { 3990 .ctl_name = 0, /* sentinel */ 3991 } 3992 }, 3993 .addrconf_conf_dir = { 3994 { 3995 .ctl_name = NET_IPV6_CONF, 3996 .procname = "conf", 3997 .mode = 0555, 3998 .child = addrconf_sysctl.addrconf_dev, 3999 }, 4000 { 4001 .ctl_name = 0, /* sentinel */ 4002 } 4003 }, 4004 .addrconf_proto_dir = { 4005 { 4006 .ctl_name = NET_IPV6, 4007 .procname = "ipv6", 4008 .mode = 0555, 4009 .child = addrconf_sysctl.addrconf_conf_dir, 4010 }, 4011 { 4012 .ctl_name = 0, /* sentinel */ 4013 } 4014 }, 4015 .addrconf_root_dir = { 4016 { 4017 .ctl_name = CTL_NET, 4018 .procname = "net", 4019 .mode = 0555, 4020 .child = addrconf_sysctl.addrconf_proto_dir, 4021 }, 4022 { 4023 .ctl_name = 0, /* sentinel */ 4024 } 4025 }, 4026 }; 4027 4028 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) 4029 { 4030 int i; 4031 struct net_device *dev = idev ? idev->dev : NULL; 4032 struct addrconf_sysctl_table *t; 4033 char *dev_name = NULL; 4034 4035 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4036 if (t == NULL) 4037 return; 4038 for (i=0; t->addrconf_vars[i].data; i++) { 4039 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4040 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4041 } 4042 if (dev) { 4043 dev_name = dev->name; 4044 t->addrconf_dev[0].ctl_name = dev->ifindex; 4045 } else { 4046 dev_name = "default"; 4047 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 4048 } 4049 4050 /* 4051 * Make a copy of dev_name, because '.procname' is regarded as const 4052 * by sysctl and we wouldn't want anyone to change it under our feet 4053 * (see SIOCSIFNAME). 4054 */ 4055 dev_name = kstrdup(dev_name, GFP_KERNEL); 4056 if (!dev_name) 4057 goto free; 4058 4059 t->addrconf_dev[0].procname = dev_name; 4060 4061 t->addrconf_dev[0].child = t->addrconf_vars; 4062 t->addrconf_conf_dir[0].child = t->addrconf_dev; 4063 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; 4064 t->addrconf_root_dir[0].child = t->addrconf_proto_dir; 4065 4066 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir); 4067 if (t->sysctl_header == NULL) 4068 goto free_procname; 4069 else 4070 p->sysctl = t; 4071 return; 4072 4073 /* error path */ 4074 free_procname: 4075 kfree(dev_name); 4076 free: 4077 kfree(t); 4078 4079 return; 4080 } 4081 4082 static void addrconf_sysctl_unregister(struct ipv6_devconf *p) 4083 { 4084 if (p->sysctl) { 4085 struct addrconf_sysctl_table *t = p->sysctl; 4086 p->sysctl = NULL; 4087 unregister_sysctl_table(t->sysctl_header); 4088 kfree(t->addrconf_dev[0].procname); 4089 kfree(t); 4090 } 4091 } 4092 4093 4094 #endif 4095 4096 /* 4097 * Device notifier 4098 */ 4099 4100 int register_inet6addr_notifier(struct notifier_block *nb) 4101 { 4102 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4103 } 4104 4105 EXPORT_SYMBOL(register_inet6addr_notifier); 4106 4107 int unregister_inet6addr_notifier(struct notifier_block *nb) 4108 { 4109 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4110 } 4111 4112 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4113 4114 /* 4115 * Init / cleanup code 4116 */ 4117 4118 int __init addrconf_init(void) 4119 { 4120 int err = 0; 4121 4122 /* The addrconf netdev notifier requires that loopback_dev 4123 * has it's ipv6 private information allocated and setup 4124 * before it can bring up and give link-local addresses 4125 * to other devices which are up. 4126 * 4127 * Unfortunately, loopback_dev is not necessarily the first 4128 * entry in the global dev_base list of net devices. In fact, 4129 * it is likely to be the very last entry on that list. 4130 * So this causes the notifier registry below to try and 4131 * give link-local addresses to all devices besides loopback_dev 4132 * first, then loopback_dev, which cases all the non-loopback_dev 4133 * devices to fail to get a link-local address. 4134 * 4135 * So, as a temporary fix, allocate the ipv6 structure for 4136 * loopback_dev first by hand. 4137 * Longer term, all of the dependencies ipv6 has upon the loopback 4138 * device and it being up should be removed. 4139 */ 4140 rtnl_lock(); 4141 if (!ipv6_add_dev(&loopback_dev)) 4142 err = -ENOMEM; 4143 rtnl_unlock(); 4144 if (err) 4145 return err; 4146 4147 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev); 4148 4149 register_netdevice_notifier(&ipv6_dev_notf); 4150 4151 addrconf_verify(0); 4152 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table; 4153 #ifdef CONFIG_SYSCTL 4154 addrconf_sysctl.sysctl_header = 4155 register_sysctl_table(addrconf_sysctl.addrconf_root_dir); 4156 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); 4157 #endif 4158 4159 return 0; 4160 } 4161 4162 void __exit addrconf_cleanup(void) 4163 { 4164 struct net_device *dev; 4165 struct inet6_dev *idev; 4166 struct inet6_ifaddr *ifa; 4167 int i; 4168 4169 unregister_netdevice_notifier(&ipv6_dev_notf); 4170 4171 rtnetlink_links[PF_INET6] = NULL; 4172 #ifdef CONFIG_SYSCTL 4173 addrconf_sysctl_unregister(&ipv6_devconf_dflt); 4174 addrconf_sysctl_unregister(&ipv6_devconf); 4175 #endif 4176 4177 rtnl_lock(); 4178 4179 /* 4180 * clean dev list. 4181 */ 4182 4183 for (dev=dev_base; dev; dev=dev->next) { 4184 if ((idev = __in6_dev_get(dev)) == NULL) 4185 continue; 4186 addrconf_ifdown(dev, 1); 4187 } 4188 addrconf_ifdown(&loopback_dev, 2); 4189 4190 /* 4191 * Check hash table. 4192 */ 4193 4194 write_lock_bh(&addrconf_hash_lock); 4195 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4196 for (ifa=inet6_addr_lst[i]; ifa; ) { 4197 struct inet6_ifaddr *bifa; 4198 4199 bifa = ifa; 4200 ifa = ifa->lst_next; 4201 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4202 /* Do not free it; something is wrong. 4203 Now we can investigate it with debugger. 4204 */ 4205 } 4206 } 4207 write_unlock_bh(&addrconf_hash_lock); 4208 4209 del_timer(&addr_chk_timer); 4210 4211 rtnl_unlock(); 4212 4213 #ifdef CONFIG_PROC_FS 4214 proc_net_remove("if_inet6"); 4215 #endif 4216 } 4217