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 #include <asm/unaligned.h> 85 86 #include <linux/proc_fs.h> 87 #include <linux/seq_file.h> 88 89 /* Set to 3 to get tracing... */ 90 #define ACONF_DEBUG 2 91 92 #if ACONF_DEBUG >= 3 93 #define ADBG(x) printk x 94 #else 95 #define ADBG(x) 96 #endif 97 98 #define INFINITY_LIFE_TIME 0xFFFFFFFF 99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 100 101 #ifdef CONFIG_SYSCTL 102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p); 103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p); 104 #endif 105 106 #ifdef CONFIG_IPV6_PRIVACY 107 static int __ipv6_regen_rndid(struct inet6_dev *idev); 108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 109 static void ipv6_regen_rndid(unsigned long data); 110 111 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 112 #endif 113 114 static int ipv6_count_addresses(struct inet6_dev *idev); 115 116 /* 117 * Configured unicast address hash table 118 */ 119 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 120 static DEFINE_RWLOCK(addrconf_hash_lock); 121 122 static void addrconf_verify(unsigned long); 123 124 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 125 static DEFINE_SPINLOCK(addrconf_verify_lock); 126 127 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 128 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 129 130 static int addrconf_ifdown(struct net_device *dev, int how); 131 132 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 133 static void addrconf_dad_timer(unsigned long data); 134 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 135 static void addrconf_dad_run(struct inet6_dev *idev); 136 static void addrconf_rs_timer(unsigned long data); 137 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 139 140 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 141 struct prefix_info *pinfo); 142 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); 143 144 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 145 146 struct ipv6_devconf ipv6_devconf __read_mostly = { 147 .forwarding = 0, 148 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 149 .mtu6 = IPV6_MIN_MTU, 150 .accept_ra = 1, 151 .accept_redirects = 1, 152 .autoconf = 1, 153 .force_mld_version = 0, 154 .dad_transmits = 1, 155 .rtr_solicits = MAX_RTR_SOLICITATIONS, 156 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 157 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 158 #ifdef CONFIG_IPV6_PRIVACY 159 .use_tempaddr = 0, 160 .temp_valid_lft = TEMP_VALID_LIFETIME, 161 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 162 .regen_max_retry = REGEN_MAX_RETRY, 163 .max_desync_factor = MAX_DESYNC_FACTOR, 164 #endif 165 .max_addresses = IPV6_MAX_ADDRESSES, 166 .accept_ra_defrtr = 1, 167 .accept_ra_pinfo = 1, 168 #ifdef CONFIG_IPV6_ROUTER_PREF 169 .accept_ra_rtr_pref = 1, 170 .rtr_probe_interval = 60 * HZ, 171 #ifdef CONFIG_IPV6_ROUTE_INFO 172 .accept_ra_rt_info_max_plen = 0, 173 #endif 174 #endif 175 .proxy_ndp = 0, 176 .accept_source_route = 0, /* we do not accept RH0 by default. */ 177 }; 178 179 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 180 .forwarding = 0, 181 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 182 .mtu6 = IPV6_MIN_MTU, 183 .accept_ra = 1, 184 .accept_redirects = 1, 185 .autoconf = 1, 186 .dad_transmits = 1, 187 .rtr_solicits = MAX_RTR_SOLICITATIONS, 188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 190 #ifdef CONFIG_IPV6_PRIVACY 191 .use_tempaddr = 0, 192 .temp_valid_lft = TEMP_VALID_LIFETIME, 193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 194 .regen_max_retry = REGEN_MAX_RETRY, 195 .max_desync_factor = MAX_DESYNC_FACTOR, 196 #endif 197 .max_addresses = IPV6_MAX_ADDRESSES, 198 .accept_ra_defrtr = 1, 199 .accept_ra_pinfo = 1, 200 #ifdef CONFIG_IPV6_ROUTER_PREF 201 .accept_ra_rtr_pref = 1, 202 .rtr_probe_interval = 60 * HZ, 203 #ifdef CONFIG_IPV6_ROUTE_INFO 204 .accept_ra_rt_info_max_plen = 0, 205 #endif 206 #endif 207 .proxy_ndp = 0, 208 .accept_source_route = 0, /* we do not accept RH0 by default. */ 209 }; 210 211 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 212 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 213 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 214 215 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 216 { 217 if (del_timer(&ifp->timer)) 218 __in6_ifa_put(ifp); 219 } 220 221 enum addrconf_timer_t 222 { 223 AC_NONE, 224 AC_DAD, 225 AC_RS, 226 }; 227 228 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 229 enum addrconf_timer_t what, 230 unsigned long when) 231 { 232 if (!del_timer(&ifp->timer)) 233 in6_ifa_hold(ifp); 234 235 switch (what) { 236 case AC_DAD: 237 ifp->timer.function = addrconf_dad_timer; 238 break; 239 case AC_RS: 240 ifp->timer.function = addrconf_rs_timer; 241 break; 242 default:; 243 } 244 ifp->timer.expires = jiffies + when; 245 add_timer(&ifp->timer); 246 } 247 248 static int snmp6_alloc_dev(struct inet6_dev *idev) 249 { 250 int err = -ENOMEM; 251 252 if (!idev || !idev->dev) 253 return -EINVAL; 254 255 if (snmp_mib_init((void **)idev->stats.ipv6, 256 sizeof(struct ipstats_mib), 257 __alignof__(struct ipstats_mib)) < 0) 258 goto err_ip; 259 if (snmp_mib_init((void **)idev->stats.icmpv6, 260 sizeof(struct icmpv6_mib), 261 __alignof__(struct icmpv6_mib)) < 0) 262 goto err_icmp; 263 264 return 0; 265 266 err_icmp: 267 snmp_mib_free((void **)idev->stats.ipv6); 268 err_ip: 269 return err; 270 } 271 272 static int snmp6_free_dev(struct inet6_dev *idev) 273 { 274 snmp_mib_free((void **)idev->stats.icmpv6); 275 snmp_mib_free((void **)idev->stats.ipv6); 276 return 0; 277 } 278 279 /* Nobody refers to this device, we may destroy it. */ 280 281 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 282 { 283 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 284 kfree(idev); 285 } 286 287 void in6_dev_finish_destroy(struct inet6_dev *idev) 288 { 289 struct net_device *dev = idev->dev; 290 BUG_TRAP(idev->addr_list==NULL); 291 BUG_TRAP(idev->mc_list==NULL); 292 #ifdef NET_REFCNT_DEBUG 293 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 294 #endif 295 dev_put(dev); 296 if (!idev->dead) { 297 printk("Freeing alive inet6 device %p\n", idev); 298 return; 299 } 300 snmp6_free_dev(idev); 301 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 302 } 303 304 EXPORT_SYMBOL(in6_dev_finish_destroy); 305 306 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 307 { 308 struct inet6_dev *ndev; 309 struct in6_addr maddr; 310 311 ASSERT_RTNL(); 312 313 if (dev->mtu < IPV6_MIN_MTU) 314 return NULL; 315 316 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 317 318 if (ndev == NULL) 319 return NULL; 320 321 rwlock_init(&ndev->lock); 322 ndev->dev = dev; 323 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf)); 324 ndev->cnf.mtu6 = dev->mtu; 325 ndev->cnf.sysctl = NULL; 326 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 327 if (ndev->nd_parms == NULL) { 328 kfree(ndev); 329 return NULL; 330 } 331 /* We refer to the device */ 332 dev_hold(dev); 333 334 if (snmp6_alloc_dev(ndev) < 0) { 335 ADBG((KERN_WARNING 336 "%s(): cannot allocate memory for statistics; dev=%s.\n", 337 __FUNCTION__, dev->name)); 338 neigh_parms_release(&nd_tbl, ndev->nd_parms); 339 ndev->dead = 1; 340 in6_dev_finish_destroy(ndev); 341 return NULL; 342 } 343 344 if (snmp6_register_dev(ndev) < 0) { 345 ADBG((KERN_WARNING 346 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 347 __FUNCTION__, dev->name)); 348 neigh_parms_release(&nd_tbl, ndev->nd_parms); 349 ndev->dead = 1; 350 in6_dev_finish_destroy(ndev); 351 return NULL; 352 } 353 354 /* One reference from device. We must do this before 355 * we invoke __ipv6_regen_rndid(). 356 */ 357 in6_dev_hold(ndev); 358 359 #ifdef CONFIG_IPV6_PRIVACY 360 init_timer(&ndev->regen_timer); 361 ndev->regen_timer.function = ipv6_regen_rndid; 362 ndev->regen_timer.data = (unsigned long) ndev; 363 if ((dev->flags&IFF_LOOPBACK) || 364 dev->type == ARPHRD_TUNNEL || 365 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 366 dev->type == ARPHRD_SIT || 367 #endif 368 dev->type == ARPHRD_NONE) { 369 printk(KERN_INFO 370 "%s: Disabled Privacy Extensions\n", 371 dev->name); 372 ndev->cnf.use_tempaddr = -1; 373 } else { 374 in6_dev_hold(ndev); 375 ipv6_regen_rndid((unsigned long) ndev); 376 } 377 #endif 378 379 if (netif_running(dev) && netif_carrier_ok(dev)) 380 ndev->if_flags |= IF_READY; 381 382 ipv6_mc_init_dev(ndev); 383 ndev->tstamp = jiffies; 384 #ifdef CONFIG_SYSCTL 385 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 386 NET_IPV6_NEIGH, "ipv6", 387 &ndisc_ifinfo_sysctl_change, 388 NULL); 389 addrconf_sysctl_register(ndev, &ndev->cnf); 390 #endif 391 /* protected by rtnl_lock */ 392 rcu_assign_pointer(dev->ip6_ptr, ndev); 393 394 /* Join all-node multicast group */ 395 ipv6_addr_all_nodes(&maddr); 396 ipv6_dev_mc_inc(dev, &maddr); 397 398 return ndev; 399 } 400 401 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 402 { 403 struct inet6_dev *idev; 404 405 ASSERT_RTNL(); 406 407 if ((idev = __in6_dev_get(dev)) == NULL) { 408 if ((idev = ipv6_add_dev(dev)) == NULL) 409 return NULL; 410 } 411 412 if (dev->flags&IFF_UP) 413 ipv6_mc_up(idev); 414 return idev; 415 } 416 417 #ifdef CONFIG_SYSCTL 418 static void dev_forward_change(struct inet6_dev *idev) 419 { 420 struct net_device *dev; 421 struct inet6_ifaddr *ifa; 422 struct in6_addr addr; 423 424 if (!idev) 425 return; 426 dev = idev->dev; 427 if (dev && (dev->flags & IFF_MULTICAST)) { 428 ipv6_addr_all_routers(&addr); 429 430 if (idev->cnf.forwarding) 431 ipv6_dev_mc_inc(dev, &addr); 432 else 433 ipv6_dev_mc_dec(dev, &addr); 434 } 435 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 436 if (ifa->flags&IFA_F_TENTATIVE) 437 continue; 438 if (idev->cnf.forwarding) 439 addrconf_join_anycast(ifa); 440 else 441 addrconf_leave_anycast(ifa); 442 } 443 } 444 445 446 static void addrconf_forward_change(void) 447 { 448 struct net_device *dev; 449 struct inet6_dev *idev; 450 451 read_lock(&dev_base_lock); 452 for_each_netdev(dev) { 453 rcu_read_lock(); 454 idev = __in6_dev_get(dev); 455 if (idev) { 456 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); 457 idev->cnf.forwarding = ipv6_devconf.forwarding; 458 if (changed) 459 dev_forward_change(idev); 460 } 461 rcu_read_unlock(); 462 } 463 read_unlock(&dev_base_lock); 464 } 465 #endif 466 467 /* Nobody refers to this ifaddr, destroy it */ 468 469 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 470 { 471 BUG_TRAP(ifp->if_next==NULL); 472 BUG_TRAP(ifp->lst_next==NULL); 473 #ifdef NET_REFCNT_DEBUG 474 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 475 #endif 476 477 in6_dev_put(ifp->idev); 478 479 if (del_timer(&ifp->timer)) 480 printk("Timer is still running, when freeing ifa=%p\n", ifp); 481 482 if (!ifp->dead) { 483 printk("Freeing alive inet6 address %p\n", ifp); 484 return; 485 } 486 dst_release(&ifp->rt->u.dst); 487 488 kfree(ifp); 489 } 490 491 static void 492 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 493 { 494 struct inet6_ifaddr *ifa, **ifap; 495 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 496 497 /* 498 * Each device address list is sorted in order of scope - 499 * global before linklocal. 500 */ 501 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 502 ifap = &ifa->if_next) { 503 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 504 break; 505 } 506 507 ifp->if_next = *ifap; 508 *ifap = ifp; 509 } 510 511 /* On success it returns ifp with increased reference count */ 512 513 static struct inet6_ifaddr * 514 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 515 int scope, u32 flags) 516 { 517 struct inet6_ifaddr *ifa = NULL; 518 struct rt6_info *rt; 519 int hash; 520 int err = 0; 521 522 rcu_read_lock_bh(); 523 if (idev->dead) { 524 err = -ENODEV; /*XXX*/ 525 goto out2; 526 } 527 528 write_lock(&addrconf_hash_lock); 529 530 /* Ignore adding duplicate addresses on an interface */ 531 if (ipv6_chk_same_addr(addr, idev->dev)) { 532 ADBG(("ipv6_add_addr: already assigned\n")); 533 err = -EEXIST; 534 goto out; 535 } 536 537 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 538 539 if (ifa == NULL) { 540 ADBG(("ipv6_add_addr: malloc failed\n")); 541 err = -ENOBUFS; 542 goto out; 543 } 544 545 rt = addrconf_dst_alloc(idev, addr, 0); 546 if (IS_ERR(rt)) { 547 err = PTR_ERR(rt); 548 goto out; 549 } 550 551 ipv6_addr_copy(&ifa->addr, addr); 552 553 spin_lock_init(&ifa->lock); 554 init_timer(&ifa->timer); 555 ifa->timer.data = (unsigned long) ifa; 556 ifa->scope = scope; 557 ifa->prefix_len = pfxlen; 558 ifa->flags = flags | IFA_F_TENTATIVE; 559 ifa->cstamp = ifa->tstamp = jiffies; 560 561 ifa->rt = rt; 562 563 /* 564 * part one of RFC 4429, section 3.3 565 * We should not configure an address as 566 * optimistic if we do not yet know the link 567 * layer address of our nexhop router 568 */ 569 570 if (rt->rt6i_nexthop == NULL) 571 ifa->flags &= ~IFA_F_OPTIMISTIC; 572 573 ifa->idev = idev; 574 in6_dev_hold(idev); 575 /* For caller */ 576 in6_ifa_hold(ifa); 577 578 /* Add to big hash table */ 579 hash = ipv6_addr_hash(addr); 580 581 ifa->lst_next = inet6_addr_lst[hash]; 582 inet6_addr_lst[hash] = ifa; 583 in6_ifa_hold(ifa); 584 write_unlock(&addrconf_hash_lock); 585 586 write_lock(&idev->lock); 587 /* Add to inet6_dev unicast addr list. */ 588 ipv6_link_dev_addr(idev, ifa); 589 590 #ifdef CONFIG_IPV6_PRIVACY 591 if (ifa->flags&IFA_F_TEMPORARY) { 592 ifa->tmp_next = idev->tempaddr_list; 593 idev->tempaddr_list = ifa; 594 in6_ifa_hold(ifa); 595 } 596 #endif 597 598 in6_ifa_hold(ifa); 599 write_unlock(&idev->lock); 600 out2: 601 rcu_read_unlock_bh(); 602 603 if (likely(err == 0)) 604 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 605 else { 606 kfree(ifa); 607 ifa = ERR_PTR(err); 608 } 609 610 return ifa; 611 out: 612 write_unlock(&addrconf_hash_lock); 613 goto out2; 614 } 615 616 /* This function wants to get referenced ifp and releases it before return */ 617 618 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 619 { 620 struct inet6_ifaddr *ifa, **ifap; 621 struct inet6_dev *idev = ifp->idev; 622 int hash; 623 int deleted = 0, onlink = 0; 624 unsigned long expires = jiffies; 625 626 hash = ipv6_addr_hash(&ifp->addr); 627 628 ifp->dead = 1; 629 630 write_lock_bh(&addrconf_hash_lock); 631 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 632 ifap = &ifa->lst_next) { 633 if (ifa == ifp) { 634 *ifap = ifa->lst_next; 635 __in6_ifa_put(ifp); 636 ifa->lst_next = NULL; 637 break; 638 } 639 } 640 write_unlock_bh(&addrconf_hash_lock); 641 642 write_lock_bh(&idev->lock); 643 #ifdef CONFIG_IPV6_PRIVACY 644 if (ifp->flags&IFA_F_TEMPORARY) { 645 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 646 ifap = &ifa->tmp_next) { 647 if (ifa == ifp) { 648 *ifap = ifa->tmp_next; 649 if (ifp->ifpub) { 650 in6_ifa_put(ifp->ifpub); 651 ifp->ifpub = NULL; 652 } 653 __in6_ifa_put(ifp); 654 ifa->tmp_next = NULL; 655 break; 656 } 657 } 658 } 659 #endif 660 661 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 662 if (ifa == ifp) { 663 *ifap = ifa->if_next; 664 __in6_ifa_put(ifp); 665 ifa->if_next = NULL; 666 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 667 break; 668 deleted = 1; 669 continue; 670 } else if (ifp->flags & IFA_F_PERMANENT) { 671 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 672 ifp->prefix_len)) { 673 if (ifa->flags & IFA_F_PERMANENT) { 674 onlink = 1; 675 if (deleted) 676 break; 677 } else { 678 unsigned long lifetime; 679 680 if (!onlink) 681 onlink = -1; 682 683 spin_lock(&ifa->lock); 684 lifetime = min_t(unsigned long, 685 ifa->valid_lft, 0x7fffffffUL/HZ); 686 if (time_before(expires, 687 ifa->tstamp + lifetime * HZ)) 688 expires = ifa->tstamp + lifetime * HZ; 689 spin_unlock(&ifa->lock); 690 } 691 } 692 } 693 ifap = &ifa->if_next; 694 } 695 write_unlock_bh(&idev->lock); 696 697 ipv6_ifa_notify(RTM_DELADDR, ifp); 698 699 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 700 701 addrconf_del_timer(ifp); 702 703 /* 704 * Purge or update corresponding prefix 705 * 706 * 1) we don't purge prefix here if address was not permanent. 707 * prefix is managed by its own lifetime. 708 * 2) if there're no addresses, delete prefix. 709 * 3) if there're still other permanent address(es), 710 * corresponding prefix is still permanent. 711 * 4) otherwise, update prefix lifetime to the 712 * longest valid lifetime among the corresponding 713 * addresses on the device. 714 * Note: subsequent RA will update lifetime. 715 * 716 * --yoshfuji 717 */ 718 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 719 struct in6_addr prefix; 720 struct rt6_info *rt; 721 722 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 723 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 724 725 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 726 if (onlink == 0) { 727 ip6_del_rt(rt); 728 rt = NULL; 729 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 730 rt->rt6i_expires = expires; 731 rt->rt6i_flags |= RTF_EXPIRES; 732 } 733 } 734 dst_release(&rt->u.dst); 735 } 736 737 in6_ifa_put(ifp); 738 } 739 740 #ifdef CONFIG_IPV6_PRIVACY 741 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 742 { 743 struct inet6_dev *idev = ifp->idev; 744 struct in6_addr addr, *tmpaddr; 745 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 746 int tmp_plen; 747 int ret = 0; 748 int max_addresses; 749 u32 addr_flags; 750 751 write_lock(&idev->lock); 752 if (ift) { 753 spin_lock_bh(&ift->lock); 754 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 755 spin_unlock_bh(&ift->lock); 756 tmpaddr = &addr; 757 } else { 758 tmpaddr = NULL; 759 } 760 retry: 761 in6_dev_hold(idev); 762 if (idev->cnf.use_tempaddr <= 0) { 763 write_unlock(&idev->lock); 764 printk(KERN_INFO 765 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 766 in6_dev_put(idev); 767 ret = -1; 768 goto out; 769 } 770 spin_lock_bh(&ifp->lock); 771 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 772 idev->cnf.use_tempaddr = -1; /*XXX*/ 773 spin_unlock_bh(&ifp->lock); 774 write_unlock(&idev->lock); 775 printk(KERN_WARNING 776 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 777 in6_dev_put(idev); 778 ret = -1; 779 goto out; 780 } 781 in6_ifa_hold(ifp); 782 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 783 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 784 spin_unlock_bh(&ifp->lock); 785 write_unlock(&idev->lock); 786 printk(KERN_WARNING 787 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 788 in6_ifa_put(ifp); 789 in6_dev_put(idev); 790 ret = -1; 791 goto out; 792 } 793 memcpy(&addr.s6_addr[8], idev->rndid, 8); 794 tmp_valid_lft = min_t(__u32, 795 ifp->valid_lft, 796 idev->cnf.temp_valid_lft); 797 tmp_prefered_lft = min_t(__u32, 798 ifp->prefered_lft, 799 idev->cnf.temp_prefered_lft - desync_factor / HZ); 800 tmp_plen = ifp->prefix_len; 801 max_addresses = idev->cnf.max_addresses; 802 tmp_cstamp = ifp->cstamp; 803 tmp_tstamp = ifp->tstamp; 804 spin_unlock_bh(&ifp->lock); 805 806 write_unlock(&idev->lock); 807 808 addr_flags = IFA_F_TEMPORARY; 809 /* set in addrconf_prefix_rcv() */ 810 if (ifp->flags & IFA_F_OPTIMISTIC) 811 addr_flags |= IFA_F_OPTIMISTIC; 812 813 ift = !max_addresses || 814 ipv6_count_addresses(idev) < max_addresses ? 815 ipv6_add_addr(idev, &addr, tmp_plen, 816 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 817 addr_flags) : NULL; 818 if (!ift || IS_ERR(ift)) { 819 in6_ifa_put(ifp); 820 in6_dev_put(idev); 821 printk(KERN_INFO 822 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 823 tmpaddr = &addr; 824 write_lock(&idev->lock); 825 goto retry; 826 } 827 828 spin_lock_bh(&ift->lock); 829 ift->ifpub = ifp; 830 ift->valid_lft = tmp_valid_lft; 831 ift->prefered_lft = tmp_prefered_lft; 832 ift->cstamp = tmp_cstamp; 833 ift->tstamp = tmp_tstamp; 834 spin_unlock_bh(&ift->lock); 835 836 addrconf_dad_start(ift, 0); 837 in6_ifa_put(ift); 838 in6_dev_put(idev); 839 out: 840 return ret; 841 } 842 #endif 843 844 /* 845 * Choose an appropriate source address (RFC3484) 846 */ 847 struct ipv6_saddr_score { 848 int addr_type; 849 unsigned int attrs; 850 int matchlen; 851 int scope; 852 unsigned int rule; 853 }; 854 855 #define IPV6_SADDR_SCORE_LOCAL 0x0001 856 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 857 #define IPV6_SADDR_SCORE_HOA 0x0008 858 #define IPV6_SADDR_SCORE_OIF 0x0010 859 #define IPV6_SADDR_SCORE_LABEL 0x0020 860 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 861 862 static inline int ipv6_saddr_preferred(int type) 863 { 864 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 865 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 866 return 1; 867 return 0; 868 } 869 870 /* static matching label */ 871 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type) 872 { 873 /* 874 * prefix (longest match) label 875 * ----------------------------- 876 * ::1/128 0 877 * ::/0 1 878 * 2002::/16 2 879 * ::/96 3 880 * ::ffff:0:0/96 4 881 * fc00::/7 5 882 * 2001::/32 6 883 */ 884 if (type & IPV6_ADDR_LOOPBACK) 885 return 0; 886 else if (type & IPV6_ADDR_COMPATv4) 887 return 3; 888 else if (type & IPV6_ADDR_MAPPED) 889 return 4; 890 else if (addr->s6_addr32[0] == htonl(0x20010000)) 891 return 6; 892 else if (addr->s6_addr16[0] == htons(0x2002)) 893 return 2; 894 else if ((addr->s6_addr[0] & 0xfe) == 0xfc) 895 return 5; 896 return 1; 897 } 898 899 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 900 struct in6_addr *daddr, struct in6_addr *saddr) 901 { 902 struct ipv6_saddr_score hiscore; 903 struct inet6_ifaddr *ifa_result = NULL; 904 int daddr_type = __ipv6_addr_type(daddr); 905 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 906 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type); 907 struct net_device *dev; 908 909 memset(&hiscore, 0, sizeof(hiscore)); 910 911 read_lock(&dev_base_lock); 912 rcu_read_lock(); 913 914 for_each_netdev(dev) { 915 struct inet6_dev *idev; 916 struct inet6_ifaddr *ifa; 917 918 /* Rule 0: Candidate Source Address (section 4) 919 * - multicast and link-local destination address, 920 * the set of candidate source address MUST only 921 * include addresses assigned to interfaces 922 * belonging to the same link as the outgoing 923 * interface. 924 * (- For site-local destination addresses, the 925 * set of candidate source addresses MUST only 926 * include addresses assigned to interfaces 927 * belonging to the same site as the outgoing 928 * interface.) 929 */ 930 if ((daddr_type & IPV6_ADDR_MULTICAST || 931 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 932 daddr_dev && dev != daddr_dev) 933 continue; 934 935 idev = __in6_dev_get(dev); 936 if (!idev) 937 continue; 938 939 read_lock_bh(&idev->lock); 940 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 941 struct ipv6_saddr_score score; 942 943 score.addr_type = __ipv6_addr_type(&ifa->addr); 944 945 /* Rule 0: 946 * - Tentative Address (RFC2462 section 5.4) 947 * - A tentative address is not considered 948 * "assigned to an interface" in the traditional 949 * sense, unless it is also flagged as optimistic. 950 * - Candidate Source Address (section 4) 951 * - In any case, anycast addresses, multicast 952 * addresses, and the unspecified address MUST 953 * NOT be included in a candidate set. 954 */ 955 if ((ifa->flags & IFA_F_TENTATIVE) && 956 (!(ifa->flags & IFA_F_OPTIMISTIC))) 957 continue; 958 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 959 score.addr_type & IPV6_ADDR_MULTICAST)) { 960 LIMIT_NETDEBUG(KERN_DEBUG 961 "ADDRCONF: unspecified / multicast address" 962 "assigned as unicast address on %s", 963 dev->name); 964 continue; 965 } 966 967 score.attrs = 0; 968 score.matchlen = 0; 969 score.scope = 0; 970 score.rule = 0; 971 972 if (ifa_result == NULL) { 973 /* record it if the first available entry */ 974 goto record_it; 975 } 976 977 /* Rule 1: Prefer same address */ 978 if (hiscore.rule < 1) { 979 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 980 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 981 hiscore.rule++; 982 } 983 if (ipv6_addr_equal(&ifa->addr, daddr)) { 984 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 985 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 986 score.rule = 1; 987 goto record_it; 988 } 989 } else { 990 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 991 continue; 992 } 993 994 /* Rule 2: Prefer appropriate scope */ 995 if (hiscore.rule < 2) { 996 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 997 hiscore.rule++; 998 } 999 score.scope = __ipv6_addr_src_scope(score.addr_type); 1000 if (hiscore.scope < score.scope) { 1001 if (hiscore.scope < daddr_scope) { 1002 score.rule = 2; 1003 goto record_it; 1004 } else 1005 continue; 1006 } else if (score.scope < hiscore.scope) { 1007 if (score.scope < daddr_scope) 1008 break; /* addresses sorted by scope */ 1009 else { 1010 score.rule = 2; 1011 goto record_it; 1012 } 1013 } 1014 1015 /* Rule 3: Avoid deprecated and optimistic addresses */ 1016 if (hiscore.rule < 3) { 1017 if (ipv6_saddr_preferred(hiscore.addr_type) || 1018 (((ifa_result->flags & 1019 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) 1020 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1021 hiscore.rule++; 1022 } 1023 if (ipv6_saddr_preferred(score.addr_type) || 1024 (((ifa_result->flags & 1025 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) { 1026 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1027 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 1028 score.rule = 3; 1029 goto record_it; 1030 } 1031 } else { 1032 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 1033 continue; 1034 } 1035 1036 /* Rule 4: Prefer home address */ 1037 #ifdef CONFIG_IPV6_MIP6 1038 if (hiscore.rule < 4) { 1039 if (ifa_result->flags & IFA_F_HOMEADDRESS) 1040 hiscore.attrs |= IPV6_SADDR_SCORE_HOA; 1041 hiscore.rule++; 1042 } 1043 if (ifa->flags & IFA_F_HOMEADDRESS) { 1044 score.attrs |= IPV6_SADDR_SCORE_HOA; 1045 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) { 1046 score.rule = 4; 1047 goto record_it; 1048 } 1049 } else { 1050 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA) 1051 continue; 1052 } 1053 #else 1054 if (hiscore.rule < 4) 1055 hiscore.rule++; 1056 #endif 1057 1058 /* Rule 5: Prefer outgoing interface */ 1059 if (hiscore.rule < 5) { 1060 if (daddr_dev == NULL || 1061 daddr_dev == ifa_result->idev->dev) 1062 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1063 hiscore.rule++; 1064 } 1065 if (daddr_dev == NULL || 1066 daddr_dev == ifa->idev->dev) { 1067 score.attrs |= IPV6_SADDR_SCORE_OIF; 1068 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1069 score.rule = 5; 1070 goto record_it; 1071 } 1072 } else { 1073 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1074 continue; 1075 } 1076 1077 /* Rule 6: Prefer matching label */ 1078 if (hiscore.rule < 6) { 1079 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) 1080 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1081 hiscore.rule++; 1082 } 1083 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { 1084 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1085 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1086 score.rule = 6; 1087 goto record_it; 1088 } 1089 } else { 1090 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1091 continue; 1092 } 1093 1094 #ifdef CONFIG_IPV6_PRIVACY 1095 /* Rule 7: Prefer public address 1096 * Note: prefer temprary address if use_tempaddr >= 2 1097 */ 1098 if (hiscore.rule < 7) { 1099 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1100 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1101 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1102 hiscore.rule++; 1103 } 1104 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1105 (ifa->idev->cnf.use_tempaddr >= 2)) { 1106 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1107 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1108 score.rule = 7; 1109 goto record_it; 1110 } 1111 } else { 1112 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1113 continue; 1114 } 1115 #else 1116 if (hiscore.rule < 7) 1117 hiscore.rule++; 1118 #endif 1119 /* Rule 8: Use longest matching prefix */ 1120 if (hiscore.rule < 8) { 1121 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1122 hiscore.rule++; 1123 } 1124 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1125 if (score.matchlen > hiscore.matchlen) { 1126 score.rule = 8; 1127 goto record_it; 1128 } 1129 #if 0 1130 else if (score.matchlen < hiscore.matchlen) 1131 continue; 1132 #endif 1133 1134 /* Final Rule: choose first available one */ 1135 continue; 1136 record_it: 1137 if (ifa_result) 1138 in6_ifa_put(ifa_result); 1139 in6_ifa_hold(ifa); 1140 ifa_result = ifa; 1141 hiscore = score; 1142 } 1143 read_unlock_bh(&idev->lock); 1144 } 1145 rcu_read_unlock(); 1146 read_unlock(&dev_base_lock); 1147 1148 if (!ifa_result) 1149 return -EADDRNOTAVAIL; 1150 1151 ipv6_addr_copy(saddr, &ifa_result->addr); 1152 in6_ifa_put(ifa_result); 1153 return 0; 1154 } 1155 1156 1157 int ipv6_get_saddr(struct dst_entry *dst, 1158 struct in6_addr *daddr, struct in6_addr *saddr) 1159 { 1160 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr); 1161 } 1162 1163 EXPORT_SYMBOL(ipv6_get_saddr); 1164 1165 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1166 unsigned char banned_flags) 1167 { 1168 struct inet6_dev *idev; 1169 int err = -EADDRNOTAVAIL; 1170 1171 rcu_read_lock(); 1172 if ((idev = __in6_dev_get(dev)) != NULL) { 1173 struct inet6_ifaddr *ifp; 1174 1175 read_lock_bh(&idev->lock); 1176 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1177 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1178 ipv6_addr_copy(addr, &ifp->addr); 1179 err = 0; 1180 break; 1181 } 1182 } 1183 read_unlock_bh(&idev->lock); 1184 } 1185 rcu_read_unlock(); 1186 return err; 1187 } 1188 1189 static int ipv6_count_addresses(struct inet6_dev *idev) 1190 { 1191 int cnt = 0; 1192 struct inet6_ifaddr *ifp; 1193 1194 read_lock_bh(&idev->lock); 1195 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1196 cnt++; 1197 read_unlock_bh(&idev->lock); 1198 return cnt; 1199 } 1200 1201 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1202 { 1203 struct inet6_ifaddr * ifp; 1204 u8 hash = ipv6_addr_hash(addr); 1205 1206 read_lock_bh(&addrconf_hash_lock); 1207 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1208 if (ipv6_addr_equal(&ifp->addr, addr) && 1209 !(ifp->flags&IFA_F_TENTATIVE)) { 1210 if (dev == NULL || ifp->idev->dev == dev || 1211 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1212 break; 1213 } 1214 } 1215 read_unlock_bh(&addrconf_hash_lock); 1216 return ifp != NULL; 1217 } 1218 1219 EXPORT_SYMBOL(ipv6_chk_addr); 1220 1221 static 1222 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1223 { 1224 struct inet6_ifaddr * ifp; 1225 u8 hash = ipv6_addr_hash(addr); 1226 1227 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1228 if (ipv6_addr_equal(&ifp->addr, addr)) { 1229 if (dev == NULL || ifp->idev->dev == dev) 1230 break; 1231 } 1232 } 1233 return ifp != NULL; 1234 } 1235 1236 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1237 { 1238 struct inet6_ifaddr * ifp; 1239 u8 hash = ipv6_addr_hash(addr); 1240 1241 read_lock_bh(&addrconf_hash_lock); 1242 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1243 if (ipv6_addr_equal(&ifp->addr, addr)) { 1244 if (dev == NULL || ifp->idev->dev == dev || 1245 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1246 in6_ifa_hold(ifp); 1247 break; 1248 } 1249 } 1250 } 1251 read_unlock_bh(&addrconf_hash_lock); 1252 1253 return ifp; 1254 } 1255 1256 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1257 { 1258 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1259 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1260 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1261 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1262 int sk_ipv6only = ipv6_only_sock(sk); 1263 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1264 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1265 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1266 1267 if (!sk2_rcv_saddr && !sk_ipv6only) 1268 return 1; 1269 1270 if (addr_type2 == IPV6_ADDR_ANY && 1271 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1272 return 1; 1273 1274 if (addr_type == IPV6_ADDR_ANY && 1275 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1276 return 1; 1277 1278 if (sk2_rcv_saddr6 && 1279 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1280 return 1; 1281 1282 if (addr_type == IPV6_ADDR_MAPPED && 1283 !sk2_ipv6only && 1284 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1285 return 1; 1286 1287 return 0; 1288 } 1289 1290 /* Gets referenced address, destroys ifaddr */ 1291 1292 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1293 { 1294 if (ifp->flags&IFA_F_PERMANENT) { 1295 spin_lock_bh(&ifp->lock); 1296 addrconf_del_timer(ifp); 1297 ifp->flags |= IFA_F_TENTATIVE; 1298 spin_unlock_bh(&ifp->lock); 1299 in6_ifa_put(ifp); 1300 #ifdef CONFIG_IPV6_PRIVACY 1301 } else if (ifp->flags&IFA_F_TEMPORARY) { 1302 struct inet6_ifaddr *ifpub; 1303 spin_lock_bh(&ifp->lock); 1304 ifpub = ifp->ifpub; 1305 if (ifpub) { 1306 in6_ifa_hold(ifpub); 1307 spin_unlock_bh(&ifp->lock); 1308 ipv6_create_tempaddr(ifpub, ifp); 1309 in6_ifa_put(ifpub); 1310 } else { 1311 spin_unlock_bh(&ifp->lock); 1312 } 1313 ipv6_del_addr(ifp); 1314 #endif 1315 } else 1316 ipv6_del_addr(ifp); 1317 } 1318 1319 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1320 { 1321 if (net_ratelimit()) 1322 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1323 addrconf_dad_stop(ifp); 1324 } 1325 1326 /* Join to solicited addr multicast group. */ 1327 1328 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1329 { 1330 struct in6_addr maddr; 1331 1332 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1333 return; 1334 1335 addrconf_addr_solict_mult(addr, &maddr); 1336 ipv6_dev_mc_inc(dev, &maddr); 1337 } 1338 1339 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1340 { 1341 struct in6_addr maddr; 1342 1343 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1344 return; 1345 1346 addrconf_addr_solict_mult(addr, &maddr); 1347 __ipv6_dev_mc_dec(idev, &maddr); 1348 } 1349 1350 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1351 { 1352 struct in6_addr addr; 1353 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1354 if (ipv6_addr_any(&addr)) 1355 return; 1356 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1357 } 1358 1359 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1360 { 1361 struct in6_addr addr; 1362 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1363 if (ipv6_addr_any(&addr)) 1364 return; 1365 __ipv6_dev_ac_dec(ifp->idev, &addr); 1366 } 1367 1368 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1369 { 1370 if (dev->addr_len != ETH_ALEN) 1371 return -1; 1372 memcpy(eui, dev->dev_addr, 3); 1373 memcpy(eui + 5, dev->dev_addr + 3, 3); 1374 1375 /* 1376 * The zSeries OSA network cards can be shared among various 1377 * OS instances, but the OSA cards have only one MAC address. 1378 * This leads to duplicate address conflicts in conjunction 1379 * with IPv6 if more than one instance uses the same card. 1380 * 1381 * The driver for these cards can deliver a unique 16-bit 1382 * identifier for each instance sharing the same card. It is 1383 * placed instead of 0xFFFE in the interface identifier. The 1384 * "u" bit of the interface identifier is not inverted in this 1385 * case. Hence the resulting interface identifier has local 1386 * scope according to RFC2373. 1387 */ 1388 if (dev->dev_id) { 1389 eui[3] = (dev->dev_id >> 8) & 0xFF; 1390 eui[4] = dev->dev_id & 0xFF; 1391 } else { 1392 eui[3] = 0xFF; 1393 eui[4] = 0xFE; 1394 eui[0] ^= 2; 1395 } 1396 return 0; 1397 } 1398 1399 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1400 { 1401 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1402 if (dev->addr_len != ARCNET_ALEN) 1403 return -1; 1404 memset(eui, 0, 7); 1405 eui[7] = *(u8*)dev->dev_addr; 1406 return 0; 1407 } 1408 1409 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1410 { 1411 if (dev->addr_len != INFINIBAND_ALEN) 1412 return -1; 1413 memcpy(eui, dev->dev_addr + 12, 8); 1414 eui[0] |= 2; 1415 return 0; 1416 } 1417 1418 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1419 { 1420 switch (dev->type) { 1421 case ARPHRD_ETHER: 1422 case ARPHRD_FDDI: 1423 case ARPHRD_IEEE802_TR: 1424 return addrconf_ifid_eui48(eui, dev); 1425 case ARPHRD_ARCNET: 1426 return addrconf_ifid_arcnet(eui, dev); 1427 case ARPHRD_INFINIBAND: 1428 return addrconf_ifid_infiniband(eui, dev); 1429 } 1430 return -1; 1431 } 1432 1433 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1434 { 1435 int err = -1; 1436 struct inet6_ifaddr *ifp; 1437 1438 read_lock_bh(&idev->lock); 1439 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1440 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1441 memcpy(eui, ifp->addr.s6_addr+8, 8); 1442 err = 0; 1443 break; 1444 } 1445 } 1446 read_unlock_bh(&idev->lock); 1447 return err; 1448 } 1449 1450 #ifdef CONFIG_IPV6_PRIVACY 1451 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1452 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1453 { 1454 regen: 1455 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1456 idev->rndid[0] &= ~0x02; 1457 1458 /* 1459 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1460 * check if generated address is not inappropriate 1461 * 1462 * - Reserved subnet anycast (RFC 2526) 1463 * 11111101 11....11 1xxxxxxx 1464 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 1465 * 00-00-5E-FE-xx-xx-xx-xx 1466 * - value 0 1467 * - XXX: already assigned to an address on the device 1468 */ 1469 if (idev->rndid[0] == 0xfd && 1470 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1471 (idev->rndid[7]&0x80)) 1472 goto regen; 1473 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1474 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1475 goto regen; 1476 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1477 goto regen; 1478 } 1479 1480 return 0; 1481 } 1482 1483 static void ipv6_regen_rndid(unsigned long data) 1484 { 1485 struct inet6_dev *idev = (struct inet6_dev *) data; 1486 unsigned long expires; 1487 1488 rcu_read_lock_bh(); 1489 write_lock_bh(&idev->lock); 1490 1491 if (idev->dead) 1492 goto out; 1493 1494 if (__ipv6_regen_rndid(idev) < 0) 1495 goto out; 1496 1497 expires = jiffies + 1498 idev->cnf.temp_prefered_lft * HZ - 1499 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1500 if (time_before(expires, jiffies)) { 1501 printk(KERN_WARNING 1502 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1503 idev->dev->name); 1504 goto out; 1505 } 1506 1507 if (!mod_timer(&idev->regen_timer, expires)) 1508 in6_dev_hold(idev); 1509 1510 out: 1511 write_unlock_bh(&idev->lock); 1512 rcu_read_unlock_bh(); 1513 in6_dev_put(idev); 1514 } 1515 1516 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1517 int ret = 0; 1518 1519 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1520 ret = __ipv6_regen_rndid(idev); 1521 return ret; 1522 } 1523 #endif 1524 1525 /* 1526 * Add prefix route. 1527 */ 1528 1529 static void 1530 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1531 unsigned long expires, u32 flags) 1532 { 1533 struct fib6_config cfg = { 1534 .fc_table = RT6_TABLE_PREFIX, 1535 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1536 .fc_ifindex = dev->ifindex, 1537 .fc_expires = expires, 1538 .fc_dst_len = plen, 1539 .fc_flags = RTF_UP | flags, 1540 }; 1541 1542 ipv6_addr_copy(&cfg.fc_dst, pfx); 1543 1544 /* Prevent useless cloning on PtP SIT. 1545 This thing is done here expecting that the whole 1546 class of non-broadcast devices need not cloning. 1547 */ 1548 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1549 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1550 cfg.fc_flags |= RTF_NONEXTHOP; 1551 #endif 1552 1553 ip6_route_add(&cfg); 1554 } 1555 1556 /* Create "default" multicast route to the interface */ 1557 1558 static void addrconf_add_mroute(struct net_device *dev) 1559 { 1560 struct fib6_config cfg = { 1561 .fc_table = RT6_TABLE_LOCAL, 1562 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1563 .fc_ifindex = dev->ifindex, 1564 .fc_dst_len = 8, 1565 .fc_flags = RTF_UP, 1566 }; 1567 1568 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1569 1570 ip6_route_add(&cfg); 1571 } 1572 1573 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1574 static void sit_route_add(struct net_device *dev) 1575 { 1576 struct fib6_config cfg = { 1577 .fc_table = RT6_TABLE_MAIN, 1578 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1579 .fc_ifindex = dev->ifindex, 1580 .fc_dst_len = 96, 1581 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1582 }; 1583 1584 /* prefix length - 96 bits "::d.d.d.d" */ 1585 ip6_route_add(&cfg); 1586 } 1587 #endif 1588 1589 static void addrconf_add_lroute(struct net_device *dev) 1590 { 1591 struct in6_addr addr; 1592 1593 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1594 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1595 } 1596 1597 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1598 { 1599 struct inet6_dev *idev; 1600 1601 ASSERT_RTNL(); 1602 1603 if ((idev = ipv6_find_idev(dev)) == NULL) 1604 return NULL; 1605 1606 /* Add default multicast route */ 1607 addrconf_add_mroute(dev); 1608 1609 /* Add link local route */ 1610 addrconf_add_lroute(dev); 1611 return idev; 1612 } 1613 1614 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1615 { 1616 struct prefix_info *pinfo; 1617 __u32 valid_lft; 1618 __u32 prefered_lft; 1619 int addr_type; 1620 unsigned long rt_expires; 1621 struct inet6_dev *in6_dev; 1622 1623 pinfo = (struct prefix_info *) opt; 1624 1625 if (len < sizeof(struct prefix_info)) { 1626 ADBG(("addrconf: prefix option too short\n")); 1627 return; 1628 } 1629 1630 /* 1631 * Validation checks ([ADDRCONF], page 19) 1632 */ 1633 1634 addr_type = ipv6_addr_type(&pinfo->prefix); 1635 1636 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1637 return; 1638 1639 valid_lft = ntohl(pinfo->valid); 1640 prefered_lft = ntohl(pinfo->prefered); 1641 1642 if (prefered_lft > valid_lft) { 1643 if (net_ratelimit()) 1644 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1645 return; 1646 } 1647 1648 in6_dev = in6_dev_get(dev); 1649 1650 if (in6_dev == NULL) { 1651 if (net_ratelimit()) 1652 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1653 return; 1654 } 1655 1656 /* 1657 * Two things going on here: 1658 * 1) Add routes for on-link prefixes 1659 * 2) Configure prefixes with the auto flag set 1660 */ 1661 1662 /* Avoid arithmetic overflow. Really, we could 1663 save rt_expires in seconds, likely valid_lft, 1664 but it would require division in fib gc, that it 1665 not good. 1666 */ 1667 if (valid_lft >= 0x7FFFFFFF/HZ) 1668 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1669 else 1670 rt_expires = valid_lft * HZ; 1671 1672 /* 1673 * We convert this (in jiffies) to clock_t later. 1674 * Avoid arithmetic overflow there as well. 1675 * Overflow can happen only if HZ < USER_HZ. 1676 */ 1677 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1678 rt_expires = 0x7FFFFFFF / USER_HZ; 1679 1680 if (pinfo->onlink) { 1681 struct rt6_info *rt; 1682 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1683 1684 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1685 if (rt->rt6i_flags&RTF_EXPIRES) { 1686 if (valid_lft == 0) { 1687 ip6_del_rt(rt); 1688 rt = NULL; 1689 } else { 1690 rt->rt6i_expires = jiffies + rt_expires; 1691 } 1692 } 1693 } else if (valid_lft) { 1694 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1695 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1696 } 1697 if (rt) 1698 dst_release(&rt->u.dst); 1699 } 1700 1701 /* Try to figure out our local address for this prefix */ 1702 1703 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1704 struct inet6_ifaddr * ifp; 1705 struct in6_addr addr; 1706 int create = 0, update_lft = 0; 1707 1708 if (pinfo->prefix_len == 64) { 1709 memcpy(&addr, &pinfo->prefix, 8); 1710 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1711 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1712 in6_dev_put(in6_dev); 1713 return; 1714 } 1715 goto ok; 1716 } 1717 if (net_ratelimit()) 1718 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1719 pinfo->prefix_len); 1720 in6_dev_put(in6_dev); 1721 return; 1722 1723 ok: 1724 1725 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1726 1727 if (ifp == NULL && valid_lft) { 1728 int max_addresses = in6_dev->cnf.max_addresses; 1729 u32 addr_flags = 0; 1730 1731 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1732 if (in6_dev->cnf.optimistic_dad && 1733 !ipv6_devconf.forwarding) 1734 addr_flags = IFA_F_OPTIMISTIC; 1735 #endif 1736 1737 /* Do not allow to create too much of autoconfigured 1738 * addresses; this would be too easy way to crash kernel. 1739 */ 1740 if (!max_addresses || 1741 ipv6_count_addresses(in6_dev) < max_addresses) 1742 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1743 addr_type&IPV6_ADDR_SCOPE_MASK, 1744 addr_flags); 1745 1746 if (!ifp || IS_ERR(ifp)) { 1747 in6_dev_put(in6_dev); 1748 return; 1749 } 1750 1751 update_lft = create = 1; 1752 ifp->cstamp = jiffies; 1753 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1754 } 1755 1756 if (ifp) { 1757 int flags; 1758 unsigned long now; 1759 #ifdef CONFIG_IPV6_PRIVACY 1760 struct inet6_ifaddr *ift; 1761 #endif 1762 u32 stored_lft; 1763 1764 /* update lifetime (RFC2462 5.5.3 e) */ 1765 spin_lock(&ifp->lock); 1766 now = jiffies; 1767 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1768 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1769 else 1770 stored_lft = 0; 1771 if (!update_lft && stored_lft) { 1772 if (valid_lft > MIN_VALID_LIFETIME || 1773 valid_lft > stored_lft) 1774 update_lft = 1; 1775 else if (stored_lft <= MIN_VALID_LIFETIME) { 1776 /* valid_lft <= stored_lft is always true */ 1777 /* XXX: IPsec */ 1778 update_lft = 0; 1779 } else { 1780 valid_lft = MIN_VALID_LIFETIME; 1781 if (valid_lft < prefered_lft) 1782 prefered_lft = valid_lft; 1783 update_lft = 1; 1784 } 1785 } 1786 1787 if (update_lft) { 1788 ifp->valid_lft = valid_lft; 1789 ifp->prefered_lft = prefered_lft; 1790 ifp->tstamp = now; 1791 flags = ifp->flags; 1792 ifp->flags &= ~IFA_F_DEPRECATED; 1793 spin_unlock(&ifp->lock); 1794 1795 if (!(flags&IFA_F_TENTATIVE)) 1796 ipv6_ifa_notify(0, ifp); 1797 } else 1798 spin_unlock(&ifp->lock); 1799 1800 #ifdef CONFIG_IPV6_PRIVACY 1801 read_lock_bh(&in6_dev->lock); 1802 /* update all temporary addresses in the list */ 1803 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1804 /* 1805 * When adjusting the lifetimes of an existing 1806 * temporary address, only lower the lifetimes. 1807 * Implementations must not increase the 1808 * lifetimes of an existing temporary address 1809 * when processing a Prefix Information Option. 1810 */ 1811 spin_lock(&ift->lock); 1812 flags = ift->flags; 1813 if (ift->valid_lft > valid_lft && 1814 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1815 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1816 if (ift->prefered_lft > prefered_lft && 1817 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1818 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1819 spin_unlock(&ift->lock); 1820 if (!(flags&IFA_F_TENTATIVE)) 1821 ipv6_ifa_notify(0, ift); 1822 } 1823 1824 if (create && in6_dev->cnf.use_tempaddr > 0) { 1825 /* 1826 * When a new public address is created as described in [ADDRCONF], 1827 * also create a new temporary address. 1828 */ 1829 read_unlock_bh(&in6_dev->lock); 1830 ipv6_create_tempaddr(ifp, NULL); 1831 } else { 1832 read_unlock_bh(&in6_dev->lock); 1833 } 1834 #endif 1835 in6_ifa_put(ifp); 1836 addrconf_verify(0); 1837 } 1838 } 1839 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1840 in6_dev_put(in6_dev); 1841 } 1842 1843 /* 1844 * Set destination address. 1845 * Special case for SIT interfaces where we create a new "virtual" 1846 * device. 1847 */ 1848 int addrconf_set_dstaddr(void __user *arg) 1849 { 1850 struct in6_ifreq ireq; 1851 struct net_device *dev; 1852 int err = -EINVAL; 1853 1854 rtnl_lock(); 1855 1856 err = -EFAULT; 1857 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1858 goto err_exit; 1859 1860 dev = __dev_get_by_index(ireq.ifr6_ifindex); 1861 1862 err = -ENODEV; 1863 if (dev == NULL) 1864 goto err_exit; 1865 1866 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1867 if (dev->type == ARPHRD_SIT) { 1868 struct ifreq ifr; 1869 mm_segment_t oldfs; 1870 struct ip_tunnel_parm p; 1871 1872 err = -EADDRNOTAVAIL; 1873 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1874 goto err_exit; 1875 1876 memset(&p, 0, sizeof(p)); 1877 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1878 p.iph.saddr = 0; 1879 p.iph.version = 4; 1880 p.iph.ihl = 5; 1881 p.iph.protocol = IPPROTO_IPV6; 1882 p.iph.ttl = 64; 1883 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1884 1885 oldfs = get_fs(); set_fs(KERNEL_DS); 1886 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1887 set_fs(oldfs); 1888 1889 if (err == 0) { 1890 err = -ENOBUFS; 1891 if ((dev = __dev_get_by_name(p.name)) == NULL) 1892 goto err_exit; 1893 err = dev_open(dev); 1894 } 1895 } 1896 #endif 1897 1898 err_exit: 1899 rtnl_unlock(); 1900 return err; 1901 } 1902 1903 /* 1904 * Manual configuration of address on an interface 1905 */ 1906 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1907 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft) 1908 { 1909 struct inet6_ifaddr *ifp; 1910 struct inet6_dev *idev; 1911 struct net_device *dev; 1912 int scope; 1913 u32 flags = RTF_EXPIRES; 1914 1915 ASSERT_RTNL(); 1916 1917 /* check the lifetime */ 1918 if (!valid_lft || prefered_lft > valid_lft) 1919 return -EINVAL; 1920 1921 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1922 return -ENODEV; 1923 1924 if ((idev = addrconf_add_dev(dev)) == NULL) 1925 return -ENOBUFS; 1926 1927 scope = ipv6_addr_scope(pfx); 1928 1929 if (valid_lft == INFINITY_LIFE_TIME) { 1930 ifa_flags |= IFA_F_PERMANENT; 1931 flags = 0; 1932 } else if (valid_lft >= 0x7FFFFFFF/HZ) 1933 valid_lft = 0x7FFFFFFF/HZ; 1934 1935 if (prefered_lft == 0) 1936 ifa_flags |= IFA_F_DEPRECATED; 1937 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1938 (prefered_lft != INFINITY_LIFE_TIME)) 1939 prefered_lft = 0x7FFFFFFF/HZ; 1940 1941 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1942 1943 if (!IS_ERR(ifp)) { 1944 spin_lock_bh(&ifp->lock); 1945 ifp->valid_lft = valid_lft; 1946 ifp->prefered_lft = prefered_lft; 1947 ifp->tstamp = jiffies; 1948 spin_unlock_bh(&ifp->lock); 1949 1950 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 1951 jiffies_to_clock_t(valid_lft * HZ), flags); 1952 /* 1953 * Note that section 3.1 of RFC 4429 indicates 1954 * that the Optimistic flag should not be set for 1955 * manually configured addresses 1956 */ 1957 addrconf_dad_start(ifp, 0); 1958 in6_ifa_put(ifp); 1959 addrconf_verify(0); 1960 return 0; 1961 } 1962 1963 return PTR_ERR(ifp); 1964 } 1965 1966 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1967 { 1968 struct inet6_ifaddr *ifp; 1969 struct inet6_dev *idev; 1970 struct net_device *dev; 1971 1972 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1973 return -ENODEV; 1974 1975 if ((idev = __in6_dev_get(dev)) == NULL) 1976 return -ENXIO; 1977 1978 read_lock_bh(&idev->lock); 1979 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1980 if (ifp->prefix_len == plen && 1981 ipv6_addr_equal(pfx, &ifp->addr)) { 1982 in6_ifa_hold(ifp); 1983 read_unlock_bh(&idev->lock); 1984 1985 ipv6_del_addr(ifp); 1986 1987 /* If the last address is deleted administratively, 1988 disable IPv6 on this interface. 1989 */ 1990 if (idev->addr_list == NULL) 1991 addrconf_ifdown(idev->dev, 1); 1992 return 0; 1993 } 1994 } 1995 read_unlock_bh(&idev->lock); 1996 return -EADDRNOTAVAIL; 1997 } 1998 1999 2000 int addrconf_add_ifaddr(void __user *arg) 2001 { 2002 struct in6_ifreq ireq; 2003 int err; 2004 2005 if (!capable(CAP_NET_ADMIN)) 2006 return -EPERM; 2007 2008 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2009 return -EFAULT; 2010 2011 rtnl_lock(); 2012 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 2013 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2014 rtnl_unlock(); 2015 return err; 2016 } 2017 2018 int addrconf_del_ifaddr(void __user *arg) 2019 { 2020 struct in6_ifreq ireq; 2021 int err; 2022 2023 if (!capable(CAP_NET_ADMIN)) 2024 return -EPERM; 2025 2026 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2027 return -EFAULT; 2028 2029 rtnl_lock(); 2030 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 2031 rtnl_unlock(); 2032 return err; 2033 } 2034 2035 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2036 static void sit_add_v4_addrs(struct inet6_dev *idev) 2037 { 2038 struct inet6_ifaddr * ifp; 2039 struct in6_addr addr; 2040 struct net_device *dev; 2041 int scope; 2042 2043 ASSERT_RTNL(); 2044 2045 memset(&addr, 0, sizeof(struct in6_addr)); 2046 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2047 2048 if (idev->dev->flags&IFF_POINTOPOINT) { 2049 addr.s6_addr32[0] = htonl(0xfe800000); 2050 scope = IFA_LINK; 2051 } else { 2052 scope = IPV6_ADDR_COMPATv4; 2053 } 2054 2055 if (addr.s6_addr32[3]) { 2056 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2057 if (!IS_ERR(ifp)) { 2058 spin_lock_bh(&ifp->lock); 2059 ifp->flags &= ~IFA_F_TENTATIVE; 2060 spin_unlock_bh(&ifp->lock); 2061 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2062 in6_ifa_put(ifp); 2063 } 2064 return; 2065 } 2066 2067 for_each_netdev(dev) { 2068 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2069 if (in_dev && (dev->flags & IFF_UP)) { 2070 struct in_ifaddr * ifa; 2071 2072 int flag = scope; 2073 2074 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2075 int plen; 2076 2077 addr.s6_addr32[3] = ifa->ifa_local; 2078 2079 if (ifa->ifa_scope == RT_SCOPE_LINK) 2080 continue; 2081 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2082 if (idev->dev->flags&IFF_POINTOPOINT) 2083 continue; 2084 flag |= IFA_HOST; 2085 } 2086 if (idev->dev->flags&IFF_POINTOPOINT) 2087 plen = 64; 2088 else 2089 plen = 96; 2090 2091 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2092 IFA_F_PERMANENT); 2093 if (!IS_ERR(ifp)) { 2094 spin_lock_bh(&ifp->lock); 2095 ifp->flags &= ~IFA_F_TENTATIVE; 2096 spin_unlock_bh(&ifp->lock); 2097 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2098 in6_ifa_put(ifp); 2099 } 2100 } 2101 } 2102 } 2103 } 2104 #endif 2105 2106 static void init_loopback(struct net_device *dev) 2107 { 2108 struct inet6_dev *idev; 2109 struct inet6_ifaddr * ifp; 2110 2111 /* ::1 */ 2112 2113 ASSERT_RTNL(); 2114 2115 if ((idev = ipv6_find_idev(dev)) == NULL) { 2116 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2117 return; 2118 } 2119 2120 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2121 if (!IS_ERR(ifp)) { 2122 spin_lock_bh(&ifp->lock); 2123 ifp->flags &= ~IFA_F_TENTATIVE; 2124 spin_unlock_bh(&ifp->lock); 2125 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2126 in6_ifa_put(ifp); 2127 } 2128 } 2129 2130 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2131 { 2132 struct inet6_ifaddr * ifp; 2133 u32 addr_flags = IFA_F_PERMANENT; 2134 2135 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2136 if (idev->cnf.optimistic_dad && 2137 !ipv6_devconf.forwarding) 2138 addr_flags |= IFA_F_OPTIMISTIC; 2139 #endif 2140 2141 2142 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2143 if (!IS_ERR(ifp)) { 2144 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2145 addrconf_dad_start(ifp, 0); 2146 in6_ifa_put(ifp); 2147 } 2148 } 2149 2150 static void addrconf_dev_config(struct net_device *dev) 2151 { 2152 struct in6_addr addr; 2153 struct inet6_dev * idev; 2154 2155 ASSERT_RTNL(); 2156 2157 idev = addrconf_add_dev(dev); 2158 if (idev == NULL) 2159 return; 2160 2161 memset(&addr, 0, sizeof(struct in6_addr)); 2162 addr.s6_addr32[0] = htonl(0xFE800000); 2163 2164 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2165 addrconf_add_linklocal(idev, &addr); 2166 } 2167 2168 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2169 static void addrconf_sit_config(struct net_device *dev) 2170 { 2171 struct inet6_dev *idev; 2172 2173 ASSERT_RTNL(); 2174 2175 /* 2176 * Configure the tunnel with one of our IPv4 2177 * addresses... we should configure all of 2178 * our v4 addrs in the tunnel 2179 */ 2180 2181 if ((idev = ipv6_find_idev(dev)) == NULL) { 2182 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2183 return; 2184 } 2185 2186 sit_add_v4_addrs(idev); 2187 2188 if (dev->flags&IFF_POINTOPOINT) { 2189 addrconf_add_mroute(dev); 2190 addrconf_add_lroute(dev); 2191 } else 2192 sit_route_add(dev); 2193 } 2194 #endif 2195 2196 static inline int 2197 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2198 { 2199 struct in6_addr lladdr; 2200 2201 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2202 addrconf_add_linklocal(idev, &lladdr); 2203 return 0; 2204 } 2205 return -1; 2206 } 2207 2208 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2209 { 2210 struct net_device *link_dev; 2211 2212 /* first try to inherit the link-local address from the link device */ 2213 if (idev->dev->iflink && 2214 (link_dev = __dev_get_by_index(idev->dev->iflink))) { 2215 if (!ipv6_inherit_linklocal(idev, link_dev)) 2216 return; 2217 } 2218 /* then try to inherit it from any device */ 2219 for_each_netdev(link_dev) { 2220 if (!ipv6_inherit_linklocal(idev, link_dev)) 2221 return; 2222 } 2223 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2224 } 2225 2226 /* 2227 * Autoconfigure tunnel with a link-local address so routing protocols, 2228 * DHCPv6, MLD etc. can be run over the virtual link 2229 */ 2230 2231 static void addrconf_ip6_tnl_config(struct net_device *dev) 2232 { 2233 struct inet6_dev *idev; 2234 2235 ASSERT_RTNL(); 2236 2237 if ((idev = addrconf_add_dev(dev)) == NULL) { 2238 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2239 return; 2240 } 2241 ip6_tnl_add_linklocal(idev); 2242 } 2243 2244 static int ipv6_hwtype(struct net_device *dev) 2245 { 2246 if ((dev->type == ARPHRD_ETHER) || 2247 (dev->type == ARPHRD_LOOPBACK) || 2248 (dev->type == ARPHRD_SIT) || 2249 (dev->type == ARPHRD_TUNNEL6) || 2250 (dev->type == ARPHRD_FDDI) || 2251 (dev->type == ARPHRD_IEEE802_TR) || 2252 (dev->type == ARPHRD_ARCNET) || 2253 (dev->type == ARPHRD_INFINIBAND)) 2254 return 1; 2255 2256 return 0; 2257 } 2258 2259 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2260 void * data) 2261 { 2262 struct net_device *dev = (struct net_device *) data; 2263 struct inet6_dev *idev; 2264 int run_pending = 0; 2265 2266 if (!ipv6_hwtype(dev)) 2267 return NOTIFY_OK; 2268 2269 idev = __in6_dev_get(dev); 2270 2271 switch(event) { 2272 case NETDEV_REGISTER: 2273 if (!idev) { 2274 idev = ipv6_add_dev(dev); 2275 if (!idev) 2276 printk(KERN_WARNING "IPv6: add_dev failed for %s\n", 2277 dev->name); 2278 } 2279 break; 2280 case NETDEV_UP: 2281 case NETDEV_CHANGE: 2282 if (event == NETDEV_UP) { 2283 if (!netif_carrier_ok(dev)) { 2284 /* device is not ready yet. */ 2285 printk(KERN_INFO 2286 "ADDRCONF(NETDEV_UP): %s: " 2287 "link is not ready\n", 2288 dev->name); 2289 break; 2290 } 2291 2292 if (idev) 2293 idev->if_flags |= IF_READY; 2294 } else { 2295 if (!netif_carrier_ok(dev)) { 2296 /* device is still not ready. */ 2297 break; 2298 } 2299 2300 if (idev) { 2301 if (idev->if_flags & IF_READY) { 2302 /* device is already configured. */ 2303 break; 2304 } 2305 idev->if_flags |= IF_READY; 2306 } 2307 2308 printk(KERN_INFO 2309 "ADDRCONF(NETDEV_CHANGE): %s: " 2310 "link becomes ready\n", 2311 dev->name); 2312 2313 run_pending = 1; 2314 } 2315 2316 switch(dev->type) { 2317 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2318 case ARPHRD_SIT: 2319 addrconf_sit_config(dev); 2320 break; 2321 #endif 2322 case ARPHRD_TUNNEL6: 2323 addrconf_ip6_tnl_config(dev); 2324 break; 2325 case ARPHRD_LOOPBACK: 2326 init_loopback(dev); 2327 break; 2328 2329 default: 2330 addrconf_dev_config(dev); 2331 break; 2332 } 2333 if (idev) { 2334 if (run_pending) 2335 addrconf_dad_run(idev); 2336 2337 /* If the MTU changed during the interface down, when the 2338 interface up, the changed MTU must be reflected in the 2339 idev as well as routers. 2340 */ 2341 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2342 rt6_mtu_change(dev, dev->mtu); 2343 idev->cnf.mtu6 = dev->mtu; 2344 } 2345 idev->tstamp = jiffies; 2346 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2347 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2348 stop IPv6 on this interface. 2349 */ 2350 if (dev->mtu < IPV6_MIN_MTU) 2351 addrconf_ifdown(dev, event != NETDEV_DOWN); 2352 } 2353 break; 2354 2355 case NETDEV_CHANGEMTU: 2356 if ( idev && dev->mtu >= IPV6_MIN_MTU) { 2357 rt6_mtu_change(dev, dev->mtu); 2358 idev->cnf.mtu6 = dev->mtu; 2359 break; 2360 } 2361 2362 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2363 2364 case NETDEV_DOWN: 2365 case NETDEV_UNREGISTER: 2366 /* 2367 * Remove all addresses from this interface. 2368 */ 2369 addrconf_ifdown(dev, event != NETDEV_DOWN); 2370 break; 2371 2372 case NETDEV_CHANGENAME: 2373 if (idev) { 2374 snmp6_unregister_dev(idev); 2375 #ifdef CONFIG_SYSCTL 2376 addrconf_sysctl_unregister(&idev->cnf); 2377 neigh_sysctl_unregister(idev->nd_parms); 2378 neigh_sysctl_register(dev, idev->nd_parms, 2379 NET_IPV6, NET_IPV6_NEIGH, "ipv6", 2380 &ndisc_ifinfo_sysctl_change, 2381 NULL); 2382 addrconf_sysctl_register(idev, &idev->cnf); 2383 #endif 2384 snmp6_register_dev(idev); 2385 } 2386 break; 2387 } 2388 2389 return NOTIFY_OK; 2390 } 2391 2392 /* 2393 * addrconf module should be notified of a device going up 2394 */ 2395 static struct notifier_block ipv6_dev_notf = { 2396 .notifier_call = addrconf_notify, 2397 .priority = 0 2398 }; 2399 2400 static int addrconf_ifdown(struct net_device *dev, int how) 2401 { 2402 struct inet6_dev *idev; 2403 struct inet6_ifaddr *ifa, **bifa; 2404 int i; 2405 2406 ASSERT_RTNL(); 2407 2408 if (dev == &loopback_dev && how == 1) 2409 how = 0; 2410 2411 rt6_ifdown(dev); 2412 neigh_ifdown(&nd_tbl, dev); 2413 2414 idev = __in6_dev_get(dev); 2415 if (idev == NULL) 2416 return -ENODEV; 2417 2418 /* Step 1: remove reference to ipv6 device from parent device. 2419 Do not dev_put! 2420 */ 2421 if (how == 1) { 2422 idev->dead = 1; 2423 2424 /* protected by rtnl_lock */ 2425 rcu_assign_pointer(dev->ip6_ptr, NULL); 2426 2427 /* Step 1.5: remove snmp6 entry */ 2428 snmp6_unregister_dev(idev); 2429 2430 } 2431 2432 /* Step 2: clear hash table */ 2433 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2434 bifa = &inet6_addr_lst[i]; 2435 2436 write_lock_bh(&addrconf_hash_lock); 2437 while ((ifa = *bifa) != NULL) { 2438 if (ifa->idev == idev) { 2439 *bifa = ifa->lst_next; 2440 ifa->lst_next = NULL; 2441 addrconf_del_timer(ifa); 2442 in6_ifa_put(ifa); 2443 continue; 2444 } 2445 bifa = &ifa->lst_next; 2446 } 2447 write_unlock_bh(&addrconf_hash_lock); 2448 } 2449 2450 write_lock_bh(&idev->lock); 2451 2452 /* Step 3: clear flags for stateless addrconf */ 2453 if (how != 1) 2454 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2455 2456 /* Step 4: clear address list */ 2457 #ifdef CONFIG_IPV6_PRIVACY 2458 if (how == 1 && del_timer(&idev->regen_timer)) 2459 in6_dev_put(idev); 2460 2461 /* clear tempaddr list */ 2462 while ((ifa = idev->tempaddr_list) != NULL) { 2463 idev->tempaddr_list = ifa->tmp_next; 2464 ifa->tmp_next = NULL; 2465 ifa->dead = 1; 2466 write_unlock_bh(&idev->lock); 2467 spin_lock_bh(&ifa->lock); 2468 2469 if (ifa->ifpub) { 2470 in6_ifa_put(ifa->ifpub); 2471 ifa->ifpub = NULL; 2472 } 2473 spin_unlock_bh(&ifa->lock); 2474 in6_ifa_put(ifa); 2475 write_lock_bh(&idev->lock); 2476 } 2477 #endif 2478 while ((ifa = idev->addr_list) != NULL) { 2479 idev->addr_list = ifa->if_next; 2480 ifa->if_next = NULL; 2481 ifa->dead = 1; 2482 addrconf_del_timer(ifa); 2483 write_unlock_bh(&idev->lock); 2484 2485 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2486 in6_ifa_put(ifa); 2487 2488 write_lock_bh(&idev->lock); 2489 } 2490 write_unlock_bh(&idev->lock); 2491 2492 /* Step 5: Discard multicast list */ 2493 2494 if (how == 1) 2495 ipv6_mc_destroy_dev(idev); 2496 else 2497 ipv6_mc_down(idev); 2498 2499 /* Step 5: netlink notification of this interface */ 2500 idev->tstamp = jiffies; 2501 inet6_ifinfo_notify(RTM_DELLINK, idev); 2502 2503 /* Shot the device (if unregistered) */ 2504 2505 if (how == 1) { 2506 #ifdef CONFIG_SYSCTL 2507 addrconf_sysctl_unregister(&idev->cnf); 2508 neigh_sysctl_unregister(idev->nd_parms); 2509 #endif 2510 neigh_parms_release(&nd_tbl, idev->nd_parms); 2511 neigh_ifdown(&nd_tbl, dev); 2512 in6_dev_put(idev); 2513 } 2514 return 0; 2515 } 2516 2517 static void addrconf_rs_timer(unsigned long data) 2518 { 2519 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2520 2521 if (ifp->idev->cnf.forwarding) 2522 goto out; 2523 2524 if (ifp->idev->if_flags & IF_RA_RCVD) { 2525 /* 2526 * Announcement received after solicitation 2527 * was sent 2528 */ 2529 goto out; 2530 } 2531 2532 spin_lock(&ifp->lock); 2533 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2534 struct in6_addr all_routers; 2535 2536 /* The wait after the last probe can be shorter */ 2537 addrconf_mod_timer(ifp, AC_RS, 2538 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2539 ifp->idev->cnf.rtr_solicit_delay : 2540 ifp->idev->cnf.rtr_solicit_interval); 2541 spin_unlock(&ifp->lock); 2542 2543 ipv6_addr_all_routers(&all_routers); 2544 2545 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2546 } else { 2547 spin_unlock(&ifp->lock); 2548 /* 2549 * Note: we do not support deprecated "all on-link" 2550 * assumption any longer. 2551 */ 2552 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2553 ifp->idev->dev->name); 2554 } 2555 2556 out: 2557 in6_ifa_put(ifp); 2558 } 2559 2560 /* 2561 * Duplicate Address Detection 2562 */ 2563 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2564 { 2565 unsigned long rand_num; 2566 struct inet6_dev *idev = ifp->idev; 2567 2568 if (ifp->flags & IFA_F_OPTIMISTIC) 2569 rand_num = 0; 2570 else 2571 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2572 2573 ifp->probes = idev->cnf.dad_transmits; 2574 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2575 } 2576 2577 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2578 { 2579 struct inet6_dev *idev = ifp->idev; 2580 struct net_device *dev = idev->dev; 2581 2582 addrconf_join_solict(dev, &ifp->addr); 2583 2584 net_srandom(ifp->addr.s6_addr32[3]); 2585 2586 read_lock_bh(&idev->lock); 2587 if (ifp->dead) 2588 goto out; 2589 spin_lock_bh(&ifp->lock); 2590 2591 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2592 !(ifp->flags&IFA_F_TENTATIVE) || 2593 ifp->flags & IFA_F_NODAD) { 2594 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2595 spin_unlock_bh(&ifp->lock); 2596 read_unlock_bh(&idev->lock); 2597 2598 addrconf_dad_completed(ifp); 2599 return; 2600 } 2601 2602 if (!(idev->if_flags & IF_READY)) { 2603 spin_unlock_bh(&ifp->lock); 2604 read_unlock_bh(&idev->lock); 2605 /* 2606 * If the defice is not ready: 2607 * - keep it tentative if it is a permanent address. 2608 * - otherwise, kill it. 2609 */ 2610 in6_ifa_hold(ifp); 2611 addrconf_dad_stop(ifp); 2612 return; 2613 } 2614 2615 /* 2616 * Optimistic nodes can start receiving 2617 * Frames right away 2618 */ 2619 if(ifp->flags & IFA_F_OPTIMISTIC) 2620 ip6_ins_rt(ifp->rt); 2621 2622 addrconf_dad_kick(ifp); 2623 spin_unlock_bh(&ifp->lock); 2624 out: 2625 read_unlock_bh(&idev->lock); 2626 } 2627 2628 static void addrconf_dad_timer(unsigned long data) 2629 { 2630 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2631 struct inet6_dev *idev = ifp->idev; 2632 struct in6_addr unspec; 2633 struct in6_addr mcaddr; 2634 2635 read_lock_bh(&idev->lock); 2636 if (idev->dead) { 2637 read_unlock_bh(&idev->lock); 2638 goto out; 2639 } 2640 spin_lock_bh(&ifp->lock); 2641 if (ifp->probes == 0) { 2642 /* 2643 * DAD was successful 2644 */ 2645 2646 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2647 spin_unlock_bh(&ifp->lock); 2648 read_unlock_bh(&idev->lock); 2649 2650 addrconf_dad_completed(ifp); 2651 2652 goto out; 2653 } 2654 2655 ifp->probes--; 2656 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2657 spin_unlock_bh(&ifp->lock); 2658 read_unlock_bh(&idev->lock); 2659 2660 /* send a neighbour solicitation for our addr */ 2661 memset(&unspec, 0, sizeof(unspec)); 2662 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2663 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2664 out: 2665 in6_ifa_put(ifp); 2666 } 2667 2668 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2669 { 2670 struct net_device * dev = ifp->idev->dev; 2671 2672 /* 2673 * Configure the address for reception. Now it is valid. 2674 */ 2675 2676 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2677 2678 /* If added prefix is link local and forwarding is off, 2679 start sending router solicitations. 2680 */ 2681 2682 if (ifp->idev->cnf.forwarding == 0 && 2683 ifp->idev->cnf.rtr_solicits > 0 && 2684 (dev->flags&IFF_LOOPBACK) == 0 && 2685 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2686 struct in6_addr all_routers; 2687 2688 ipv6_addr_all_routers(&all_routers); 2689 2690 /* 2691 * If a host as already performed a random delay 2692 * [...] as part of DAD [...] there is no need 2693 * to delay again before sending the first RS 2694 */ 2695 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2696 2697 spin_lock_bh(&ifp->lock); 2698 ifp->probes = 1; 2699 ifp->idev->if_flags |= IF_RS_SENT; 2700 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2701 spin_unlock_bh(&ifp->lock); 2702 } 2703 } 2704 2705 static void addrconf_dad_run(struct inet6_dev *idev) { 2706 struct inet6_ifaddr *ifp; 2707 2708 read_lock_bh(&idev->lock); 2709 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2710 spin_lock_bh(&ifp->lock); 2711 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2712 spin_unlock_bh(&ifp->lock); 2713 continue; 2714 } 2715 spin_unlock_bh(&ifp->lock); 2716 addrconf_dad_kick(ifp); 2717 } 2718 read_unlock_bh(&idev->lock); 2719 } 2720 2721 #ifdef CONFIG_PROC_FS 2722 struct if6_iter_state { 2723 int bucket; 2724 }; 2725 2726 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2727 { 2728 struct inet6_ifaddr *ifa = NULL; 2729 struct if6_iter_state *state = seq->private; 2730 2731 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2732 ifa = inet6_addr_lst[state->bucket]; 2733 if (ifa) 2734 break; 2735 } 2736 return ifa; 2737 } 2738 2739 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2740 { 2741 struct if6_iter_state *state = seq->private; 2742 2743 ifa = ifa->lst_next; 2744 try_again: 2745 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2746 ifa = inet6_addr_lst[state->bucket]; 2747 goto try_again; 2748 } 2749 return ifa; 2750 } 2751 2752 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2753 { 2754 struct inet6_ifaddr *ifa = if6_get_first(seq); 2755 2756 if (ifa) 2757 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2758 --pos; 2759 return pos ? NULL : ifa; 2760 } 2761 2762 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2763 { 2764 read_lock_bh(&addrconf_hash_lock); 2765 return if6_get_idx(seq, *pos); 2766 } 2767 2768 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2769 { 2770 struct inet6_ifaddr *ifa; 2771 2772 ifa = if6_get_next(seq, v); 2773 ++*pos; 2774 return ifa; 2775 } 2776 2777 static void if6_seq_stop(struct seq_file *seq, void *v) 2778 { 2779 read_unlock_bh(&addrconf_hash_lock); 2780 } 2781 2782 static int if6_seq_show(struct seq_file *seq, void *v) 2783 { 2784 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2785 seq_printf(seq, 2786 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2787 NIP6(ifp->addr), 2788 ifp->idev->dev->ifindex, 2789 ifp->prefix_len, 2790 ifp->scope, 2791 ifp->flags, 2792 ifp->idev->dev->name); 2793 return 0; 2794 } 2795 2796 static struct seq_operations if6_seq_ops = { 2797 .start = if6_seq_start, 2798 .next = if6_seq_next, 2799 .show = if6_seq_show, 2800 .stop = if6_seq_stop, 2801 }; 2802 2803 static int if6_seq_open(struct inode *inode, struct file *file) 2804 { 2805 struct seq_file *seq; 2806 int rc = -ENOMEM; 2807 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2808 2809 if (!s) 2810 goto out; 2811 2812 rc = seq_open(file, &if6_seq_ops); 2813 if (rc) 2814 goto out_kfree; 2815 2816 seq = file->private_data; 2817 seq->private = s; 2818 out: 2819 return rc; 2820 out_kfree: 2821 kfree(s); 2822 goto out; 2823 } 2824 2825 static const struct file_operations if6_fops = { 2826 .owner = THIS_MODULE, 2827 .open = if6_seq_open, 2828 .read = seq_read, 2829 .llseek = seq_lseek, 2830 .release = seq_release_private, 2831 }; 2832 2833 int __init if6_proc_init(void) 2834 { 2835 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops)) 2836 return -ENOMEM; 2837 return 0; 2838 } 2839 2840 void if6_proc_exit(void) 2841 { 2842 proc_net_remove("if_inet6"); 2843 } 2844 #endif /* CONFIG_PROC_FS */ 2845 2846 #ifdef CONFIG_IPV6_MIP6 2847 /* Check if address is a home address configured on any interface. */ 2848 int ipv6_chk_home_addr(struct in6_addr *addr) 2849 { 2850 int ret = 0; 2851 struct inet6_ifaddr * ifp; 2852 u8 hash = ipv6_addr_hash(addr); 2853 read_lock_bh(&addrconf_hash_lock); 2854 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2855 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 && 2856 (ifp->flags & IFA_F_HOMEADDRESS)) { 2857 ret = 1; 2858 break; 2859 } 2860 } 2861 read_unlock_bh(&addrconf_hash_lock); 2862 return ret; 2863 } 2864 #endif 2865 2866 /* 2867 * Periodic address status verification 2868 */ 2869 2870 static void addrconf_verify(unsigned long foo) 2871 { 2872 struct inet6_ifaddr *ifp; 2873 unsigned long now, next; 2874 int i; 2875 2876 spin_lock_bh(&addrconf_verify_lock); 2877 now = jiffies; 2878 next = now + ADDR_CHECK_FREQUENCY; 2879 2880 del_timer(&addr_chk_timer); 2881 2882 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2883 2884 restart: 2885 read_lock(&addrconf_hash_lock); 2886 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2887 unsigned long age; 2888 #ifdef CONFIG_IPV6_PRIVACY 2889 unsigned long regen_advance; 2890 #endif 2891 2892 if (ifp->flags & IFA_F_PERMANENT) 2893 continue; 2894 2895 spin_lock(&ifp->lock); 2896 age = (now - ifp->tstamp) / HZ; 2897 2898 #ifdef CONFIG_IPV6_PRIVACY 2899 regen_advance = ifp->idev->cnf.regen_max_retry * 2900 ifp->idev->cnf.dad_transmits * 2901 ifp->idev->nd_parms->retrans_time / HZ; 2902 #endif 2903 2904 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2905 age >= ifp->valid_lft) { 2906 spin_unlock(&ifp->lock); 2907 in6_ifa_hold(ifp); 2908 read_unlock(&addrconf_hash_lock); 2909 ipv6_del_addr(ifp); 2910 goto restart; 2911 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2912 spin_unlock(&ifp->lock); 2913 continue; 2914 } else if (age >= ifp->prefered_lft) { 2915 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2916 int deprecate = 0; 2917 2918 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2919 deprecate = 1; 2920 ifp->flags |= IFA_F_DEPRECATED; 2921 } 2922 2923 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2924 next = ifp->tstamp + ifp->valid_lft * HZ; 2925 2926 spin_unlock(&ifp->lock); 2927 2928 if (deprecate) { 2929 in6_ifa_hold(ifp); 2930 read_unlock(&addrconf_hash_lock); 2931 2932 ipv6_ifa_notify(0, ifp); 2933 in6_ifa_put(ifp); 2934 goto restart; 2935 } 2936 #ifdef CONFIG_IPV6_PRIVACY 2937 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2938 !(ifp->flags&IFA_F_TENTATIVE)) { 2939 if (age >= ifp->prefered_lft - regen_advance) { 2940 struct inet6_ifaddr *ifpub = ifp->ifpub; 2941 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2942 next = ifp->tstamp + ifp->prefered_lft * HZ; 2943 if (!ifp->regen_count && ifpub) { 2944 ifp->regen_count++; 2945 in6_ifa_hold(ifp); 2946 in6_ifa_hold(ifpub); 2947 spin_unlock(&ifp->lock); 2948 read_unlock(&addrconf_hash_lock); 2949 spin_lock(&ifpub->lock); 2950 ifpub->regen_count = 0; 2951 spin_unlock(&ifpub->lock); 2952 ipv6_create_tempaddr(ifpub, ifp); 2953 in6_ifa_put(ifpub); 2954 in6_ifa_put(ifp); 2955 goto restart; 2956 } 2957 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2958 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2959 spin_unlock(&ifp->lock); 2960 #endif 2961 } else { 2962 /* ifp->prefered_lft <= ifp->valid_lft */ 2963 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2964 next = ifp->tstamp + ifp->prefered_lft * HZ; 2965 spin_unlock(&ifp->lock); 2966 } 2967 } 2968 read_unlock(&addrconf_hash_lock); 2969 } 2970 2971 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2972 add_timer(&addr_chk_timer); 2973 spin_unlock_bh(&addrconf_verify_lock); 2974 } 2975 2976 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 2977 { 2978 struct in6_addr *pfx = NULL; 2979 2980 if (addr) 2981 pfx = nla_data(addr); 2982 2983 if (local) { 2984 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 2985 pfx = NULL; 2986 else 2987 pfx = nla_data(local); 2988 } 2989 2990 return pfx; 2991 } 2992 2993 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = { 2994 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 2995 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 2996 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 2997 }; 2998 2999 static int 3000 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3001 { 3002 struct ifaddrmsg *ifm; 3003 struct nlattr *tb[IFA_MAX+1]; 3004 struct in6_addr *pfx; 3005 int err; 3006 3007 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3008 if (err < 0) 3009 return err; 3010 3011 ifm = nlmsg_data(nlh); 3012 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3013 if (pfx == NULL) 3014 return -EINVAL; 3015 3016 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3017 } 3018 3019 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3020 u32 prefered_lft, u32 valid_lft) 3021 { 3022 u32 flags = RTF_EXPIRES; 3023 3024 if (!valid_lft || (prefered_lft > valid_lft)) 3025 return -EINVAL; 3026 3027 if (valid_lft == INFINITY_LIFE_TIME) { 3028 ifa_flags |= IFA_F_PERMANENT; 3029 flags = 0; 3030 } else if (valid_lft >= 0x7FFFFFFF/HZ) 3031 valid_lft = 0x7FFFFFFF/HZ; 3032 3033 if (prefered_lft == 0) 3034 ifa_flags |= IFA_F_DEPRECATED; 3035 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 3036 (prefered_lft != INFINITY_LIFE_TIME)) 3037 prefered_lft = 0x7FFFFFFF/HZ; 3038 3039 spin_lock_bh(&ifp->lock); 3040 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3041 ifp->tstamp = jiffies; 3042 ifp->valid_lft = valid_lft; 3043 ifp->prefered_lft = prefered_lft; 3044 3045 spin_unlock_bh(&ifp->lock); 3046 if (!(ifp->flags&IFA_F_TENTATIVE)) 3047 ipv6_ifa_notify(0, ifp); 3048 3049 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3050 jiffies_to_clock_t(valid_lft * HZ), flags); 3051 addrconf_verify(0); 3052 3053 return 0; 3054 } 3055 3056 static int 3057 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3058 { 3059 struct ifaddrmsg *ifm; 3060 struct nlattr *tb[IFA_MAX+1]; 3061 struct in6_addr *pfx; 3062 struct inet6_ifaddr *ifa; 3063 struct net_device *dev; 3064 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3065 u8 ifa_flags; 3066 int err; 3067 3068 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3069 if (err < 0) 3070 return err; 3071 3072 ifm = nlmsg_data(nlh); 3073 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3074 if (pfx == NULL) 3075 return -EINVAL; 3076 3077 if (tb[IFA_CACHEINFO]) { 3078 struct ifa_cacheinfo *ci; 3079 3080 ci = nla_data(tb[IFA_CACHEINFO]); 3081 valid_lft = ci->ifa_valid; 3082 preferred_lft = ci->ifa_prefered; 3083 } else { 3084 preferred_lft = INFINITY_LIFE_TIME; 3085 valid_lft = INFINITY_LIFE_TIME; 3086 } 3087 3088 dev = __dev_get_by_index(ifm->ifa_index); 3089 if (dev == NULL) 3090 return -ENODEV; 3091 3092 /* We ignore other flags so far. */ 3093 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3094 3095 ifa = ipv6_get_ifaddr(pfx, dev, 1); 3096 if (ifa == NULL) { 3097 /* 3098 * It would be best to check for !NLM_F_CREATE here but 3099 * userspace alreay relies on not having to provide this. 3100 */ 3101 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 3102 ifa_flags, preferred_lft, valid_lft); 3103 } 3104 3105 if (nlh->nlmsg_flags & NLM_F_EXCL || 3106 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3107 err = -EEXIST; 3108 else 3109 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3110 3111 in6_ifa_put(ifa); 3112 3113 return err; 3114 } 3115 3116 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3117 u8 scope, int ifindex) 3118 { 3119 struct ifaddrmsg *ifm; 3120 3121 ifm = nlmsg_data(nlh); 3122 ifm->ifa_family = AF_INET6; 3123 ifm->ifa_prefixlen = prefixlen; 3124 ifm->ifa_flags = flags; 3125 ifm->ifa_scope = scope; 3126 ifm->ifa_index = ifindex; 3127 } 3128 3129 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3130 unsigned long tstamp, u32 preferred, u32 valid) 3131 { 3132 struct ifa_cacheinfo ci; 3133 3134 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3135 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3136 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3137 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3138 ci.ifa_prefered = preferred; 3139 ci.ifa_valid = valid; 3140 3141 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3142 } 3143 3144 static inline int rt_scope(int ifa_scope) 3145 { 3146 if (ifa_scope & IFA_HOST) 3147 return RT_SCOPE_HOST; 3148 else if (ifa_scope & IFA_LINK) 3149 return RT_SCOPE_LINK; 3150 else if (ifa_scope & IFA_SITE) 3151 return RT_SCOPE_SITE; 3152 else 3153 return RT_SCOPE_UNIVERSE; 3154 } 3155 3156 static inline int inet6_ifaddr_msgsize(void) 3157 { 3158 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3159 + nla_total_size(16) /* IFA_ADDRESS */ 3160 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3161 } 3162 3163 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3164 u32 pid, u32 seq, int event, unsigned int flags) 3165 { 3166 struct nlmsghdr *nlh; 3167 u32 preferred, valid; 3168 3169 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3170 if (nlh == NULL) 3171 return -EMSGSIZE; 3172 3173 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3174 ifa->idev->dev->ifindex); 3175 3176 if (!(ifa->flags&IFA_F_PERMANENT)) { 3177 preferred = ifa->prefered_lft; 3178 valid = ifa->valid_lft; 3179 if (preferred != INFINITY_LIFE_TIME) { 3180 long tval = (jiffies - ifa->tstamp)/HZ; 3181 preferred -= tval; 3182 if (valid != INFINITY_LIFE_TIME) 3183 valid -= tval; 3184 } 3185 } else { 3186 preferred = INFINITY_LIFE_TIME; 3187 valid = INFINITY_LIFE_TIME; 3188 } 3189 3190 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3191 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3192 nlmsg_cancel(skb, nlh); 3193 return -EMSGSIZE; 3194 } 3195 3196 return nlmsg_end(skb, nlh); 3197 } 3198 3199 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3200 u32 pid, u32 seq, int event, u16 flags) 3201 { 3202 struct nlmsghdr *nlh; 3203 u8 scope = RT_SCOPE_UNIVERSE; 3204 int ifindex = ifmca->idev->dev->ifindex; 3205 3206 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3207 scope = RT_SCOPE_SITE; 3208 3209 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3210 if (nlh == NULL) 3211 return -EMSGSIZE; 3212 3213 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3214 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3215 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3216 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3217 nlmsg_cancel(skb, nlh); 3218 return -EMSGSIZE; 3219 } 3220 3221 return nlmsg_end(skb, nlh); 3222 } 3223 3224 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3225 u32 pid, u32 seq, int event, unsigned int flags) 3226 { 3227 struct nlmsghdr *nlh; 3228 u8 scope = RT_SCOPE_UNIVERSE; 3229 int ifindex = ifaca->aca_idev->dev->ifindex; 3230 3231 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3232 scope = RT_SCOPE_SITE; 3233 3234 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3235 if (nlh == NULL) 3236 return -EMSGSIZE; 3237 3238 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3239 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3240 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3241 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3242 nlmsg_cancel(skb, nlh); 3243 return -EMSGSIZE; 3244 } 3245 3246 return nlmsg_end(skb, nlh); 3247 } 3248 3249 enum addr_type_t 3250 { 3251 UNICAST_ADDR, 3252 MULTICAST_ADDR, 3253 ANYCAST_ADDR, 3254 }; 3255 3256 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3257 enum addr_type_t type) 3258 { 3259 int idx, ip_idx; 3260 int s_idx, s_ip_idx; 3261 int err = 1; 3262 struct net_device *dev; 3263 struct inet6_dev *idev = NULL; 3264 struct inet6_ifaddr *ifa; 3265 struct ifmcaddr6 *ifmca; 3266 struct ifacaddr6 *ifaca; 3267 3268 s_idx = cb->args[0]; 3269 s_ip_idx = ip_idx = cb->args[1]; 3270 3271 idx = 0; 3272 for_each_netdev(dev) { 3273 if (idx < s_idx) 3274 goto cont; 3275 if (idx > s_idx) 3276 s_ip_idx = 0; 3277 ip_idx = 0; 3278 if ((idev = in6_dev_get(dev)) == NULL) 3279 goto cont; 3280 read_lock_bh(&idev->lock); 3281 switch (type) { 3282 case UNICAST_ADDR: 3283 /* unicast address incl. temp addr */ 3284 for (ifa = idev->addr_list; ifa; 3285 ifa = ifa->if_next, ip_idx++) { 3286 if (ip_idx < s_ip_idx) 3287 continue; 3288 if ((err = inet6_fill_ifaddr(skb, ifa, 3289 NETLINK_CB(cb->skb).pid, 3290 cb->nlh->nlmsg_seq, RTM_NEWADDR, 3291 NLM_F_MULTI)) <= 0) 3292 goto done; 3293 } 3294 break; 3295 case MULTICAST_ADDR: 3296 /* multicast address */ 3297 for (ifmca = idev->mc_list; ifmca; 3298 ifmca = ifmca->next, ip_idx++) { 3299 if (ip_idx < s_ip_idx) 3300 continue; 3301 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 3302 NETLINK_CB(cb->skb).pid, 3303 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 3304 NLM_F_MULTI)) <= 0) 3305 goto done; 3306 } 3307 break; 3308 case ANYCAST_ADDR: 3309 /* anycast address */ 3310 for (ifaca = idev->ac_list; ifaca; 3311 ifaca = ifaca->aca_next, ip_idx++) { 3312 if (ip_idx < s_ip_idx) 3313 continue; 3314 if ((err = inet6_fill_ifacaddr(skb, ifaca, 3315 NETLINK_CB(cb->skb).pid, 3316 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 3317 NLM_F_MULTI)) <= 0) 3318 goto done; 3319 } 3320 break; 3321 default: 3322 break; 3323 } 3324 read_unlock_bh(&idev->lock); 3325 in6_dev_put(idev); 3326 cont: 3327 idx++; 3328 } 3329 done: 3330 if (err <= 0) { 3331 read_unlock_bh(&idev->lock); 3332 in6_dev_put(idev); 3333 } 3334 cb->args[0] = idx; 3335 cb->args[1] = ip_idx; 3336 return skb->len; 3337 } 3338 3339 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3340 { 3341 enum addr_type_t type = UNICAST_ADDR; 3342 return inet6_dump_addr(skb, cb, type); 3343 } 3344 3345 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3346 { 3347 enum addr_type_t type = MULTICAST_ADDR; 3348 return inet6_dump_addr(skb, cb, type); 3349 } 3350 3351 3352 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3353 { 3354 enum addr_type_t type = ANYCAST_ADDR; 3355 return inet6_dump_addr(skb, cb, type); 3356 } 3357 3358 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3359 void *arg) 3360 { 3361 struct ifaddrmsg *ifm; 3362 struct nlattr *tb[IFA_MAX+1]; 3363 struct in6_addr *addr = NULL; 3364 struct net_device *dev = NULL; 3365 struct inet6_ifaddr *ifa; 3366 struct sk_buff *skb; 3367 int err; 3368 3369 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3370 if (err < 0) 3371 goto errout; 3372 3373 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3374 if (addr == NULL) { 3375 err = -EINVAL; 3376 goto errout; 3377 } 3378 3379 ifm = nlmsg_data(nlh); 3380 if (ifm->ifa_index) 3381 dev = __dev_get_by_index(ifm->ifa_index); 3382 3383 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) { 3384 err = -EADDRNOTAVAIL; 3385 goto errout; 3386 } 3387 3388 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3389 err = -ENOBUFS; 3390 goto errout_ifa; 3391 } 3392 3393 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3394 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3395 if (err < 0) { 3396 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3397 WARN_ON(err == -EMSGSIZE); 3398 kfree_skb(skb); 3399 goto errout_ifa; 3400 } 3401 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); 3402 errout_ifa: 3403 in6_ifa_put(ifa); 3404 errout: 3405 return err; 3406 } 3407 3408 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3409 { 3410 struct sk_buff *skb; 3411 int err = -ENOBUFS; 3412 3413 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3414 if (skb == NULL) 3415 goto errout; 3416 3417 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3418 if (err < 0) { 3419 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3420 WARN_ON(err == -EMSGSIZE); 3421 kfree_skb(skb); 3422 goto errout; 3423 } 3424 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3425 errout: 3426 if (err < 0) 3427 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3428 } 3429 3430 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3431 __s32 *array, int bytes) 3432 { 3433 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3434 3435 memset(array, 0, bytes); 3436 array[DEVCONF_FORWARDING] = cnf->forwarding; 3437 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3438 array[DEVCONF_MTU6] = cnf->mtu6; 3439 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3440 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3441 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3442 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3443 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3444 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3445 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3446 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3447 #ifdef CONFIG_IPV6_PRIVACY 3448 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3449 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3450 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3451 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3452 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3453 #endif 3454 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3455 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3456 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3457 #ifdef CONFIG_IPV6_ROUTER_PREF 3458 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3459 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3460 #ifdef CONFIG_IPV6_ROUTE_INFO 3461 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3462 #endif 3463 #endif 3464 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3465 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3466 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3467 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3468 #endif 3469 } 3470 3471 static inline size_t inet6_if_nlmsg_size(void) 3472 { 3473 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3474 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3475 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3476 + nla_total_size(4) /* IFLA_MTU */ 3477 + nla_total_size(4) /* IFLA_LINK */ 3478 + nla_total_size( /* IFLA_PROTINFO */ 3479 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3480 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3481 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3482 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3483 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3484 ); 3485 } 3486 3487 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3488 int bytes) 3489 { 3490 int i; 3491 int pad = bytes - sizeof(u64) * items; 3492 BUG_ON(pad < 0); 3493 3494 /* Use put_unaligned() because stats may not be aligned for u64. */ 3495 put_unaligned(items, &stats[0]); 3496 for (i = 1; i < items; i++) 3497 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3498 3499 memset(&stats[items], 0, pad); 3500 } 3501 3502 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3503 int bytes) 3504 { 3505 switch(attrtype) { 3506 case IFLA_INET6_STATS: 3507 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3508 break; 3509 case IFLA_INET6_ICMP6STATS: 3510 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3511 break; 3512 } 3513 } 3514 3515 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3516 u32 pid, u32 seq, int event, unsigned int flags) 3517 { 3518 struct net_device *dev = idev->dev; 3519 struct nlattr *nla; 3520 struct ifinfomsg *hdr; 3521 struct nlmsghdr *nlh; 3522 void *protoinfo; 3523 struct ifla_cacheinfo ci; 3524 3525 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3526 if (nlh == NULL) 3527 return -EMSGSIZE; 3528 3529 hdr = nlmsg_data(nlh); 3530 hdr->ifi_family = AF_INET6; 3531 hdr->__ifi_pad = 0; 3532 hdr->ifi_type = dev->type; 3533 hdr->ifi_index = dev->ifindex; 3534 hdr->ifi_flags = dev_get_flags(dev); 3535 hdr->ifi_change = 0; 3536 3537 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3538 3539 if (dev->addr_len) 3540 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3541 3542 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3543 if (dev->ifindex != dev->iflink) 3544 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3545 3546 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3547 if (protoinfo == NULL) 3548 goto nla_put_failure; 3549 3550 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3551 3552 ci.max_reasm_len = IPV6_MAXPLEN; 3553 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3554 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3555 ci.reachable_time = idev->nd_parms->reachable_time; 3556 ci.retrans_time = idev->nd_parms->retrans_time; 3557 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3558 3559 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3560 if (nla == NULL) 3561 goto nla_put_failure; 3562 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3563 3564 /* XXX - MC not implemented */ 3565 3566 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3567 if (nla == NULL) 3568 goto nla_put_failure; 3569 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3570 3571 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3572 if (nla == NULL) 3573 goto nla_put_failure; 3574 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3575 3576 nla_nest_end(skb, protoinfo); 3577 return nlmsg_end(skb, nlh); 3578 3579 nla_put_failure: 3580 nlmsg_cancel(skb, nlh); 3581 return -EMSGSIZE; 3582 } 3583 3584 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3585 { 3586 int idx, err; 3587 int s_idx = cb->args[0]; 3588 struct net_device *dev; 3589 struct inet6_dev *idev; 3590 3591 read_lock(&dev_base_lock); 3592 idx = 0; 3593 for_each_netdev(dev) { 3594 if (idx < s_idx) 3595 goto cont; 3596 if ((idev = in6_dev_get(dev)) == NULL) 3597 goto cont; 3598 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3599 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3600 in6_dev_put(idev); 3601 if (err <= 0) 3602 break; 3603 cont: 3604 idx++; 3605 } 3606 read_unlock(&dev_base_lock); 3607 cb->args[0] = idx; 3608 3609 return skb->len; 3610 } 3611 3612 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3613 { 3614 struct sk_buff *skb; 3615 int err = -ENOBUFS; 3616 3617 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3618 if (skb == NULL) 3619 goto errout; 3620 3621 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3622 if (err < 0) { 3623 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3624 WARN_ON(err == -EMSGSIZE); 3625 kfree_skb(skb); 3626 goto errout; 3627 } 3628 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3629 errout: 3630 if (err < 0) 3631 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3632 } 3633 3634 static inline size_t inet6_prefix_nlmsg_size(void) 3635 { 3636 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3637 + nla_total_size(sizeof(struct in6_addr)) 3638 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3639 } 3640 3641 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3642 struct prefix_info *pinfo, u32 pid, u32 seq, 3643 int event, unsigned int flags) 3644 { 3645 struct prefixmsg *pmsg; 3646 struct nlmsghdr *nlh; 3647 struct prefix_cacheinfo ci; 3648 3649 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3650 if (nlh == NULL) 3651 return -EMSGSIZE; 3652 3653 pmsg = nlmsg_data(nlh); 3654 pmsg->prefix_family = AF_INET6; 3655 pmsg->prefix_pad1 = 0; 3656 pmsg->prefix_pad2 = 0; 3657 pmsg->prefix_ifindex = idev->dev->ifindex; 3658 pmsg->prefix_len = pinfo->prefix_len; 3659 pmsg->prefix_type = pinfo->type; 3660 pmsg->prefix_pad3 = 0; 3661 pmsg->prefix_flags = 0; 3662 if (pinfo->onlink) 3663 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3664 if (pinfo->autoconf) 3665 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3666 3667 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3668 3669 ci.preferred_time = ntohl(pinfo->prefered); 3670 ci.valid_time = ntohl(pinfo->valid); 3671 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3672 3673 return nlmsg_end(skb, nlh); 3674 3675 nla_put_failure: 3676 nlmsg_cancel(skb, nlh); 3677 return -EMSGSIZE; 3678 } 3679 3680 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3681 struct prefix_info *pinfo) 3682 { 3683 struct sk_buff *skb; 3684 int err = -ENOBUFS; 3685 3686 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3687 if (skb == NULL) 3688 goto errout; 3689 3690 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3691 if (err < 0) { 3692 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3693 WARN_ON(err == -EMSGSIZE); 3694 kfree_skb(skb); 3695 goto errout; 3696 } 3697 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3698 errout: 3699 if (err < 0) 3700 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err); 3701 } 3702 3703 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3704 { 3705 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3706 3707 switch (event) { 3708 case RTM_NEWADDR: 3709 /* 3710 * If the address was optimistic 3711 * we inserted the route at the start of 3712 * our DAD process, so we don't need 3713 * to do it again 3714 */ 3715 if (!(ifp->rt->rt6i_node)) 3716 ip6_ins_rt(ifp->rt); 3717 if (ifp->idev->cnf.forwarding) 3718 addrconf_join_anycast(ifp); 3719 break; 3720 case RTM_DELADDR: 3721 if (ifp->idev->cnf.forwarding) 3722 addrconf_leave_anycast(ifp); 3723 addrconf_leave_solict(ifp->idev, &ifp->addr); 3724 dst_hold(&ifp->rt->u.dst); 3725 if (ip6_del_rt(ifp->rt)) 3726 dst_free(&ifp->rt->u.dst); 3727 break; 3728 } 3729 } 3730 3731 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3732 { 3733 rcu_read_lock_bh(); 3734 if (likely(ifp->idev->dead == 0)) 3735 __ipv6_ifa_notify(event, ifp); 3736 rcu_read_unlock_bh(); 3737 } 3738 3739 #ifdef CONFIG_SYSCTL 3740 3741 static 3742 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3743 void __user *buffer, size_t *lenp, loff_t *ppos) 3744 { 3745 int *valp = ctl->data; 3746 int val = *valp; 3747 int ret; 3748 3749 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3750 3751 if (write && valp != &ipv6_devconf_dflt.forwarding) { 3752 if (valp != &ipv6_devconf.forwarding) { 3753 if ((!*valp) ^ (!val)) { 3754 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 3755 if (idev == NULL) 3756 return ret; 3757 dev_forward_change(idev); 3758 } 3759 } else { 3760 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; 3761 addrconf_forward_change(); 3762 } 3763 if (*valp) 3764 rt6_purge_dflt_routers(); 3765 } 3766 3767 return ret; 3768 } 3769 3770 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3771 int __user *name, int nlen, 3772 void __user *oldval, 3773 size_t __user *oldlenp, 3774 void __user *newval, size_t newlen) 3775 { 3776 int *valp = table->data; 3777 int new; 3778 3779 if (!newval || !newlen) 3780 return 0; 3781 if (newlen != sizeof(int)) 3782 return -EINVAL; 3783 if (get_user(new, (int __user *)newval)) 3784 return -EFAULT; 3785 if (new == *valp) 3786 return 0; 3787 if (oldval && oldlenp) { 3788 size_t len; 3789 if (get_user(len, oldlenp)) 3790 return -EFAULT; 3791 if (len) { 3792 if (len > table->maxlen) 3793 len = table->maxlen; 3794 if (copy_to_user(oldval, valp, len)) 3795 return -EFAULT; 3796 if (put_user(len, oldlenp)) 3797 return -EFAULT; 3798 } 3799 } 3800 3801 if (valp != &ipv6_devconf_dflt.forwarding) { 3802 if (valp != &ipv6_devconf.forwarding) { 3803 struct inet6_dev *idev = (struct inet6_dev *)table->extra1; 3804 int changed; 3805 if (unlikely(idev == NULL)) 3806 return -ENODEV; 3807 changed = (!*valp) ^ (!new); 3808 *valp = new; 3809 if (changed) 3810 dev_forward_change(idev); 3811 } else { 3812 *valp = new; 3813 addrconf_forward_change(); 3814 } 3815 3816 if (*valp) 3817 rt6_purge_dflt_routers(); 3818 } else 3819 *valp = new; 3820 3821 return 1; 3822 } 3823 3824 static struct addrconf_sysctl_table 3825 { 3826 struct ctl_table_header *sysctl_header; 3827 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3828 ctl_table addrconf_dev[2]; 3829 ctl_table addrconf_conf_dir[2]; 3830 ctl_table addrconf_proto_dir[2]; 3831 ctl_table addrconf_root_dir[2]; 3832 } addrconf_sysctl __read_mostly = { 3833 .sysctl_header = NULL, 3834 .addrconf_vars = { 3835 { 3836 .ctl_name = NET_IPV6_FORWARDING, 3837 .procname = "forwarding", 3838 .data = &ipv6_devconf.forwarding, 3839 .maxlen = sizeof(int), 3840 .mode = 0644, 3841 .proc_handler = &addrconf_sysctl_forward, 3842 .strategy = &addrconf_sysctl_forward_strategy, 3843 }, 3844 { 3845 .ctl_name = NET_IPV6_HOP_LIMIT, 3846 .procname = "hop_limit", 3847 .data = &ipv6_devconf.hop_limit, 3848 .maxlen = sizeof(int), 3849 .mode = 0644, 3850 .proc_handler = proc_dointvec, 3851 }, 3852 { 3853 .ctl_name = NET_IPV6_MTU, 3854 .procname = "mtu", 3855 .data = &ipv6_devconf.mtu6, 3856 .maxlen = sizeof(int), 3857 .mode = 0644, 3858 .proc_handler = &proc_dointvec, 3859 }, 3860 { 3861 .ctl_name = NET_IPV6_ACCEPT_RA, 3862 .procname = "accept_ra", 3863 .data = &ipv6_devconf.accept_ra, 3864 .maxlen = sizeof(int), 3865 .mode = 0644, 3866 .proc_handler = &proc_dointvec, 3867 }, 3868 { 3869 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3870 .procname = "accept_redirects", 3871 .data = &ipv6_devconf.accept_redirects, 3872 .maxlen = sizeof(int), 3873 .mode = 0644, 3874 .proc_handler = &proc_dointvec, 3875 }, 3876 { 3877 .ctl_name = NET_IPV6_AUTOCONF, 3878 .procname = "autoconf", 3879 .data = &ipv6_devconf.autoconf, 3880 .maxlen = sizeof(int), 3881 .mode = 0644, 3882 .proc_handler = &proc_dointvec, 3883 }, 3884 { 3885 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3886 .procname = "dad_transmits", 3887 .data = &ipv6_devconf.dad_transmits, 3888 .maxlen = sizeof(int), 3889 .mode = 0644, 3890 .proc_handler = &proc_dointvec, 3891 }, 3892 { 3893 .ctl_name = NET_IPV6_RTR_SOLICITS, 3894 .procname = "router_solicitations", 3895 .data = &ipv6_devconf.rtr_solicits, 3896 .maxlen = sizeof(int), 3897 .mode = 0644, 3898 .proc_handler = &proc_dointvec, 3899 }, 3900 { 3901 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3902 .procname = "router_solicitation_interval", 3903 .data = &ipv6_devconf.rtr_solicit_interval, 3904 .maxlen = sizeof(int), 3905 .mode = 0644, 3906 .proc_handler = &proc_dointvec_jiffies, 3907 .strategy = &sysctl_jiffies, 3908 }, 3909 { 3910 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3911 .procname = "router_solicitation_delay", 3912 .data = &ipv6_devconf.rtr_solicit_delay, 3913 .maxlen = sizeof(int), 3914 .mode = 0644, 3915 .proc_handler = &proc_dointvec_jiffies, 3916 .strategy = &sysctl_jiffies, 3917 }, 3918 { 3919 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3920 .procname = "force_mld_version", 3921 .data = &ipv6_devconf.force_mld_version, 3922 .maxlen = sizeof(int), 3923 .mode = 0644, 3924 .proc_handler = &proc_dointvec, 3925 }, 3926 #ifdef CONFIG_IPV6_PRIVACY 3927 { 3928 .ctl_name = NET_IPV6_USE_TEMPADDR, 3929 .procname = "use_tempaddr", 3930 .data = &ipv6_devconf.use_tempaddr, 3931 .maxlen = sizeof(int), 3932 .mode = 0644, 3933 .proc_handler = &proc_dointvec, 3934 }, 3935 { 3936 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3937 .procname = "temp_valid_lft", 3938 .data = &ipv6_devconf.temp_valid_lft, 3939 .maxlen = sizeof(int), 3940 .mode = 0644, 3941 .proc_handler = &proc_dointvec, 3942 }, 3943 { 3944 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3945 .procname = "temp_prefered_lft", 3946 .data = &ipv6_devconf.temp_prefered_lft, 3947 .maxlen = sizeof(int), 3948 .mode = 0644, 3949 .proc_handler = &proc_dointvec, 3950 }, 3951 { 3952 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3953 .procname = "regen_max_retry", 3954 .data = &ipv6_devconf.regen_max_retry, 3955 .maxlen = sizeof(int), 3956 .mode = 0644, 3957 .proc_handler = &proc_dointvec, 3958 }, 3959 { 3960 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3961 .procname = "max_desync_factor", 3962 .data = &ipv6_devconf.max_desync_factor, 3963 .maxlen = sizeof(int), 3964 .mode = 0644, 3965 .proc_handler = &proc_dointvec, 3966 }, 3967 #endif 3968 { 3969 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3970 .procname = "max_addresses", 3971 .data = &ipv6_devconf.max_addresses, 3972 .maxlen = sizeof(int), 3973 .mode = 0644, 3974 .proc_handler = &proc_dointvec, 3975 }, 3976 { 3977 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 3978 .procname = "accept_ra_defrtr", 3979 .data = &ipv6_devconf.accept_ra_defrtr, 3980 .maxlen = sizeof(int), 3981 .mode = 0644, 3982 .proc_handler = &proc_dointvec, 3983 }, 3984 { 3985 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 3986 .procname = "accept_ra_pinfo", 3987 .data = &ipv6_devconf.accept_ra_pinfo, 3988 .maxlen = sizeof(int), 3989 .mode = 0644, 3990 .proc_handler = &proc_dointvec, 3991 }, 3992 #ifdef CONFIG_IPV6_ROUTER_PREF 3993 { 3994 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 3995 .procname = "accept_ra_rtr_pref", 3996 .data = &ipv6_devconf.accept_ra_rtr_pref, 3997 .maxlen = sizeof(int), 3998 .mode = 0644, 3999 .proc_handler = &proc_dointvec, 4000 }, 4001 { 4002 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4003 .procname = "router_probe_interval", 4004 .data = &ipv6_devconf.rtr_probe_interval, 4005 .maxlen = sizeof(int), 4006 .mode = 0644, 4007 .proc_handler = &proc_dointvec_jiffies, 4008 .strategy = &sysctl_jiffies, 4009 }, 4010 #ifdef CONFIG_IPV6_ROUTE_INFO 4011 { 4012 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4013 .procname = "accept_ra_rt_info_max_plen", 4014 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4015 .maxlen = sizeof(int), 4016 .mode = 0644, 4017 .proc_handler = &proc_dointvec, 4018 }, 4019 #endif 4020 #endif 4021 { 4022 .ctl_name = NET_IPV6_PROXY_NDP, 4023 .procname = "proxy_ndp", 4024 .data = &ipv6_devconf.proxy_ndp, 4025 .maxlen = sizeof(int), 4026 .mode = 0644, 4027 .proc_handler = &proc_dointvec, 4028 }, 4029 { 4030 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4031 .procname = "accept_source_route", 4032 .data = &ipv6_devconf.accept_source_route, 4033 .maxlen = sizeof(int), 4034 .mode = 0644, 4035 .proc_handler = &proc_dointvec, 4036 }, 4037 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4038 { 4039 .ctl_name = CTL_UNNUMBERED, 4040 .procname = "optimistic_dad", 4041 .data = &ipv6_devconf.optimistic_dad, 4042 .maxlen = sizeof(int), 4043 .mode = 0644, 4044 .proc_handler = &proc_dointvec, 4045 4046 }, 4047 #endif 4048 { 4049 .ctl_name = 0, /* sentinel */ 4050 } 4051 }, 4052 .addrconf_dev = { 4053 { 4054 .ctl_name = NET_PROTO_CONF_ALL, 4055 .procname = "all", 4056 .mode = 0555, 4057 .child = addrconf_sysctl.addrconf_vars, 4058 }, 4059 { 4060 .ctl_name = 0, /* sentinel */ 4061 } 4062 }, 4063 .addrconf_conf_dir = { 4064 { 4065 .ctl_name = NET_IPV6_CONF, 4066 .procname = "conf", 4067 .mode = 0555, 4068 .child = addrconf_sysctl.addrconf_dev, 4069 }, 4070 { 4071 .ctl_name = 0, /* sentinel */ 4072 } 4073 }, 4074 .addrconf_proto_dir = { 4075 { 4076 .ctl_name = NET_IPV6, 4077 .procname = "ipv6", 4078 .mode = 0555, 4079 .child = addrconf_sysctl.addrconf_conf_dir, 4080 }, 4081 { 4082 .ctl_name = 0, /* sentinel */ 4083 } 4084 }, 4085 .addrconf_root_dir = { 4086 { 4087 .ctl_name = CTL_NET, 4088 .procname = "net", 4089 .mode = 0555, 4090 .child = addrconf_sysctl.addrconf_proto_dir, 4091 }, 4092 { 4093 .ctl_name = 0, /* sentinel */ 4094 } 4095 }, 4096 }; 4097 4098 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) 4099 { 4100 int i; 4101 struct net_device *dev = idev ? idev->dev : NULL; 4102 struct addrconf_sysctl_table *t; 4103 char *dev_name = NULL; 4104 4105 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4106 if (t == NULL) 4107 return; 4108 for (i=0; t->addrconf_vars[i].data; i++) { 4109 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4110 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4111 } 4112 if (dev) { 4113 dev_name = dev->name; 4114 t->addrconf_dev[0].ctl_name = dev->ifindex; 4115 } else { 4116 dev_name = "default"; 4117 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 4118 } 4119 4120 /* 4121 * Make a copy of dev_name, because '.procname' is regarded as const 4122 * by sysctl and we wouldn't want anyone to change it under our feet 4123 * (see SIOCSIFNAME). 4124 */ 4125 dev_name = kstrdup(dev_name, GFP_KERNEL); 4126 if (!dev_name) 4127 goto free; 4128 4129 t->addrconf_dev[0].procname = dev_name; 4130 4131 t->addrconf_dev[0].child = t->addrconf_vars; 4132 t->addrconf_conf_dir[0].child = t->addrconf_dev; 4133 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; 4134 t->addrconf_root_dir[0].child = t->addrconf_proto_dir; 4135 4136 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir); 4137 if (t->sysctl_header == NULL) 4138 goto free_procname; 4139 else 4140 p->sysctl = t; 4141 return; 4142 4143 /* error path */ 4144 free_procname: 4145 kfree(dev_name); 4146 free: 4147 kfree(t); 4148 4149 return; 4150 } 4151 4152 static void addrconf_sysctl_unregister(struct ipv6_devconf *p) 4153 { 4154 if (p->sysctl) { 4155 struct addrconf_sysctl_table *t = p->sysctl; 4156 p->sysctl = NULL; 4157 unregister_sysctl_table(t->sysctl_header); 4158 kfree(t->addrconf_dev[0].procname); 4159 kfree(t); 4160 } 4161 } 4162 4163 4164 #endif 4165 4166 /* 4167 * Device notifier 4168 */ 4169 4170 int register_inet6addr_notifier(struct notifier_block *nb) 4171 { 4172 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4173 } 4174 4175 EXPORT_SYMBOL(register_inet6addr_notifier); 4176 4177 int unregister_inet6addr_notifier(struct notifier_block *nb) 4178 { 4179 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4180 } 4181 4182 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4183 4184 /* 4185 * Init / cleanup code 4186 */ 4187 4188 int __init addrconf_init(void) 4189 { 4190 int err = 0; 4191 4192 /* The addrconf netdev notifier requires that loopback_dev 4193 * has it's ipv6 private information allocated and setup 4194 * before it can bring up and give link-local addresses 4195 * to other devices which are up. 4196 * 4197 * Unfortunately, loopback_dev is not necessarily the first 4198 * entry in the global dev_base list of net devices. In fact, 4199 * it is likely to be the very last entry on that list. 4200 * So this causes the notifier registry below to try and 4201 * give link-local addresses to all devices besides loopback_dev 4202 * first, then loopback_dev, which cases all the non-loopback_dev 4203 * devices to fail to get a link-local address. 4204 * 4205 * So, as a temporary fix, allocate the ipv6 structure for 4206 * loopback_dev first by hand. 4207 * Longer term, all of the dependencies ipv6 has upon the loopback 4208 * device and it being up should be removed. 4209 */ 4210 rtnl_lock(); 4211 if (!ipv6_add_dev(&loopback_dev)) 4212 err = -ENOMEM; 4213 rtnl_unlock(); 4214 if (err) 4215 return err; 4216 4217 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev); 4218 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 4219 ip6_prohibit_entry.rt6i_idev = in6_dev_get(&loopback_dev); 4220 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(&loopback_dev); 4221 #endif 4222 4223 register_netdevice_notifier(&ipv6_dev_notf); 4224 4225 addrconf_verify(0); 4226 4227 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4228 if (err < 0) 4229 goto errout; 4230 4231 /* Only the first call to __rtnl_register can fail */ 4232 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4233 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4234 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4235 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4236 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4237 4238 #ifdef CONFIG_SYSCTL 4239 addrconf_sysctl.sysctl_header = 4240 register_sysctl_table(addrconf_sysctl.addrconf_root_dir); 4241 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); 4242 #endif 4243 4244 return 0; 4245 errout: 4246 unregister_netdevice_notifier(&ipv6_dev_notf); 4247 4248 return err; 4249 } 4250 4251 void __exit addrconf_cleanup(void) 4252 { 4253 struct net_device *dev; 4254 struct inet6_dev *idev; 4255 struct inet6_ifaddr *ifa; 4256 int i; 4257 4258 unregister_netdevice_notifier(&ipv6_dev_notf); 4259 4260 #ifdef CONFIG_SYSCTL 4261 addrconf_sysctl_unregister(&ipv6_devconf_dflt); 4262 addrconf_sysctl_unregister(&ipv6_devconf); 4263 #endif 4264 4265 rtnl_lock(); 4266 4267 /* 4268 * clean dev list. 4269 */ 4270 4271 for_each_netdev(dev) { 4272 if ((idev = __in6_dev_get(dev)) == NULL) 4273 continue; 4274 addrconf_ifdown(dev, 1); 4275 } 4276 addrconf_ifdown(&loopback_dev, 2); 4277 4278 /* 4279 * Check hash table. 4280 */ 4281 4282 write_lock_bh(&addrconf_hash_lock); 4283 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4284 for (ifa=inet6_addr_lst[i]; ifa; ) { 4285 struct inet6_ifaddr *bifa; 4286 4287 bifa = ifa; 4288 ifa = ifa->lst_next; 4289 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4290 /* Do not free it; something is wrong. 4291 Now we can investigate it with debugger. 4292 */ 4293 } 4294 } 4295 write_unlock_bh(&addrconf_hash_lock); 4296 4297 del_timer(&addr_chk_timer); 4298 4299 rtnl_unlock(); 4300 4301 #ifdef CONFIG_PROC_FS 4302 proc_net_remove("if_inet6"); 4303 #endif 4304 } 4305