1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 /* 18 * Changes: 19 * 20 * Janos Farkas : delete timer on ifdown 21 * <chexum@bankinf.banki.hu> 22 * Andi Kleen : kill double kfree on module 23 * unload. 24 * Maciej W. Rozycki : FDDI support 25 * sekiya@USAGI : Don't send too many RS 26 * packets. 27 * yoshfuji@USAGI : Fixed interval between DAD 28 * packets. 29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 30 * address validation timer. 31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 32 * support. 33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 34 * address on a same interface. 35 * YOSHIFUJI Hideaki @USAGI : ARCnet support 36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 37 * seq_file. 38 * YOSHIFUJI Hideaki @USAGI : improved source address 39 * selection; consider scope, 40 * status etc. 41 */ 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/socket.h> 46 #include <linux/sockios.h> 47 #include <linux/net.h> 48 #include <linux/in6.h> 49 #include <linux/netdevice.h> 50 #include <linux/if_addr.h> 51 #include <linux/if_arp.h> 52 #include <linux/if_arcnet.h> 53 #include <linux/if_infiniband.h> 54 #include <linux/route.h> 55 #include <linux/inetdevice.h> 56 #include <linux/init.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <linux/if_tunnel.h> 78 #include <linux/rtnetlink.h> 79 80 #ifdef CONFIG_IPV6_PRIVACY 81 #include <linux/random.h> 82 #endif 83 84 #include <asm/uaccess.h> 85 #include <asm/unaligned.h> 86 87 #include <linux/proc_fs.h> 88 #include <linux/seq_file.h> 89 90 /* Set to 3 to get tracing... */ 91 #define ACONF_DEBUG 2 92 93 #if ACONF_DEBUG >= 3 94 #define ADBG(x) printk x 95 #else 96 #define ADBG(x) 97 #endif 98 99 #define INFINITY_LIFE_TIME 0xFFFFFFFF 100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 101 102 #ifdef CONFIG_SYSCTL 103 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p); 104 static void addrconf_sysctl_unregister(struct ipv6_devconf *p); 105 #endif 106 107 #ifdef CONFIG_IPV6_PRIVACY 108 static int __ipv6_regen_rndid(struct inet6_dev *idev); 109 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 110 static void ipv6_regen_rndid(unsigned long data); 111 112 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 113 #endif 114 115 static int ipv6_count_addresses(struct inet6_dev *idev); 116 117 /* 118 * Configured unicast address hash table 119 */ 120 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 121 static DEFINE_RWLOCK(addrconf_hash_lock); 122 123 static void addrconf_verify(unsigned long); 124 125 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 126 static DEFINE_SPINLOCK(addrconf_verify_lock); 127 128 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 129 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 130 131 static int addrconf_ifdown(struct net_device *dev, int how); 132 133 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 134 static void addrconf_dad_timer(unsigned long data); 135 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 136 static void addrconf_dad_run(struct inet6_dev *idev); 137 static void addrconf_rs_timer(unsigned long data); 138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 139 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 140 141 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 142 struct prefix_info *pinfo); 143 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); 144 145 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 146 147 struct ipv6_devconf ipv6_devconf __read_mostly = { 148 .forwarding = 0, 149 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 150 .mtu6 = IPV6_MIN_MTU, 151 .accept_ra = 1, 152 .accept_redirects = 1, 153 .autoconf = 1, 154 .force_mld_version = 0, 155 .dad_transmits = 1, 156 .rtr_solicits = MAX_RTR_SOLICITATIONS, 157 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 158 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 159 #ifdef CONFIG_IPV6_PRIVACY 160 .use_tempaddr = 0, 161 .temp_valid_lft = TEMP_VALID_LIFETIME, 162 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 163 .regen_max_retry = REGEN_MAX_RETRY, 164 .max_desync_factor = MAX_DESYNC_FACTOR, 165 #endif 166 .max_addresses = IPV6_MAX_ADDRESSES, 167 .accept_ra_defrtr = 1, 168 .accept_ra_pinfo = 1, 169 #ifdef CONFIG_IPV6_ROUTER_PREF 170 .accept_ra_rtr_pref = 1, 171 .rtr_probe_interval = 60 * HZ, 172 #ifdef CONFIG_IPV6_ROUTE_INFO 173 .accept_ra_rt_info_max_plen = 0, 174 #endif 175 #endif 176 .proxy_ndp = 0, 177 .accept_source_route = 0, /* we do not accept RH0 by default. */ 178 }; 179 180 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 181 .forwarding = 0, 182 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 183 .mtu6 = IPV6_MIN_MTU, 184 .accept_ra = 1, 185 .accept_redirects = 1, 186 .autoconf = 1, 187 .dad_transmits = 1, 188 .rtr_solicits = MAX_RTR_SOLICITATIONS, 189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 191 #ifdef CONFIG_IPV6_PRIVACY 192 .use_tempaddr = 0, 193 .temp_valid_lft = TEMP_VALID_LIFETIME, 194 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 195 .regen_max_retry = REGEN_MAX_RETRY, 196 .max_desync_factor = MAX_DESYNC_FACTOR, 197 #endif 198 .max_addresses = IPV6_MAX_ADDRESSES, 199 .accept_ra_defrtr = 1, 200 .accept_ra_pinfo = 1, 201 #ifdef CONFIG_IPV6_ROUTER_PREF 202 .accept_ra_rtr_pref = 1, 203 .rtr_probe_interval = 60 * HZ, 204 #ifdef CONFIG_IPV6_ROUTE_INFO 205 .accept_ra_rt_info_max_plen = 0, 206 #endif 207 #endif 208 .proxy_ndp = 0, 209 .accept_source_route = 0, /* we do not accept RH0 by default. */ 210 }; 211 212 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 213 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 214 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 215 216 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 217 { 218 if (del_timer(&ifp->timer)) 219 __in6_ifa_put(ifp); 220 } 221 222 enum addrconf_timer_t 223 { 224 AC_NONE, 225 AC_DAD, 226 AC_RS, 227 }; 228 229 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 230 enum addrconf_timer_t what, 231 unsigned long when) 232 { 233 if (!del_timer(&ifp->timer)) 234 in6_ifa_hold(ifp); 235 236 switch (what) { 237 case AC_DAD: 238 ifp->timer.function = addrconf_dad_timer; 239 break; 240 case AC_RS: 241 ifp->timer.function = addrconf_rs_timer; 242 break; 243 default:; 244 } 245 ifp->timer.expires = jiffies + when; 246 add_timer(&ifp->timer); 247 } 248 249 static int snmp6_alloc_dev(struct inet6_dev *idev) 250 { 251 int err = -ENOMEM; 252 253 if (!idev || !idev->dev) 254 return -EINVAL; 255 256 if (snmp_mib_init((void **)idev->stats.ipv6, 257 sizeof(struct ipstats_mib), 258 __alignof__(struct ipstats_mib)) < 0) 259 goto err_ip; 260 if (snmp_mib_init((void **)idev->stats.icmpv6, 261 sizeof(struct icmpv6_mib), 262 __alignof__(struct icmpv6_mib)) < 0) 263 goto err_icmp; 264 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 265 sizeof(struct icmpv6msg_mib), 266 __alignof__(struct icmpv6msg_mib)) < 0) 267 goto err_icmpmsg; 268 269 return 0; 270 271 err_icmpmsg: 272 snmp_mib_free((void **)idev->stats.icmpv6); 273 err_icmp: 274 snmp_mib_free((void **)idev->stats.ipv6); 275 err_ip: 276 return err; 277 } 278 279 static int snmp6_free_dev(struct inet6_dev *idev) 280 { 281 snmp_mib_free((void **)idev->stats.icmpv6msg); 282 snmp_mib_free((void **)idev->stats.icmpv6); 283 snmp_mib_free((void **)idev->stats.ipv6); 284 return 0; 285 } 286 287 /* Nobody refers to this device, we may destroy it. */ 288 289 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 290 { 291 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 292 kfree(idev); 293 } 294 295 void in6_dev_finish_destroy(struct inet6_dev *idev) 296 { 297 struct net_device *dev = idev->dev; 298 BUG_TRAP(idev->addr_list==NULL); 299 BUG_TRAP(idev->mc_list==NULL); 300 #ifdef NET_REFCNT_DEBUG 301 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 302 #endif 303 dev_put(dev); 304 if (!idev->dead) { 305 printk("Freeing alive inet6 device %p\n", idev); 306 return; 307 } 308 snmp6_free_dev(idev); 309 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 310 } 311 312 EXPORT_SYMBOL(in6_dev_finish_destroy); 313 314 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 315 { 316 struct inet6_dev *ndev; 317 struct in6_addr maddr; 318 319 ASSERT_RTNL(); 320 321 if (dev->mtu < IPV6_MIN_MTU) 322 return NULL; 323 324 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 325 326 if (ndev == NULL) 327 return NULL; 328 329 rwlock_init(&ndev->lock); 330 ndev->dev = dev; 331 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf)); 332 ndev->cnf.mtu6 = dev->mtu; 333 ndev->cnf.sysctl = NULL; 334 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 335 if (ndev->nd_parms == NULL) { 336 kfree(ndev); 337 return NULL; 338 } 339 /* We refer to the device */ 340 dev_hold(dev); 341 342 if (snmp6_alloc_dev(ndev) < 0) { 343 ADBG((KERN_WARNING 344 "%s(): cannot allocate memory for statistics; dev=%s.\n", 345 __FUNCTION__, dev->name)); 346 neigh_parms_release(&nd_tbl, ndev->nd_parms); 347 ndev->dead = 1; 348 in6_dev_finish_destroy(ndev); 349 return NULL; 350 } 351 352 if (snmp6_register_dev(ndev) < 0) { 353 ADBG((KERN_WARNING 354 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 355 __FUNCTION__, dev->name)); 356 neigh_parms_release(&nd_tbl, ndev->nd_parms); 357 ndev->dead = 1; 358 in6_dev_finish_destroy(ndev); 359 return NULL; 360 } 361 362 /* One reference from device. We must do this before 363 * we invoke __ipv6_regen_rndid(). 364 */ 365 in6_dev_hold(ndev); 366 367 #ifdef CONFIG_IPV6_PRIVACY 368 init_timer(&ndev->regen_timer); 369 ndev->regen_timer.function = ipv6_regen_rndid; 370 ndev->regen_timer.data = (unsigned long) ndev; 371 if ((dev->flags&IFF_LOOPBACK) || 372 dev->type == ARPHRD_TUNNEL || 373 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 374 dev->type == ARPHRD_SIT || 375 #endif 376 dev->type == ARPHRD_NONE) { 377 printk(KERN_INFO 378 "%s: Disabled Privacy Extensions\n", 379 dev->name); 380 ndev->cnf.use_tempaddr = -1; 381 } else { 382 in6_dev_hold(ndev); 383 ipv6_regen_rndid((unsigned long) ndev); 384 } 385 #endif 386 387 if (netif_running(dev) && netif_carrier_ok(dev)) 388 ndev->if_flags |= IF_READY; 389 390 ipv6_mc_init_dev(ndev); 391 ndev->tstamp = jiffies; 392 #ifdef CONFIG_SYSCTL 393 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 394 NET_IPV6_NEIGH, "ipv6", 395 &ndisc_ifinfo_sysctl_change, 396 NULL); 397 addrconf_sysctl_register(ndev, &ndev->cnf); 398 #endif 399 /* protected by rtnl_lock */ 400 rcu_assign_pointer(dev->ip6_ptr, ndev); 401 402 /* Join all-node multicast group */ 403 ipv6_addr_all_nodes(&maddr); 404 ipv6_dev_mc_inc(dev, &maddr); 405 406 return ndev; 407 } 408 409 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 410 { 411 struct inet6_dev *idev; 412 413 ASSERT_RTNL(); 414 415 if ((idev = __in6_dev_get(dev)) == NULL) { 416 if ((idev = ipv6_add_dev(dev)) == NULL) 417 return NULL; 418 } 419 420 if (dev->flags&IFF_UP) 421 ipv6_mc_up(idev); 422 return idev; 423 } 424 425 #ifdef CONFIG_SYSCTL 426 static void dev_forward_change(struct inet6_dev *idev) 427 { 428 struct net_device *dev; 429 struct inet6_ifaddr *ifa; 430 struct in6_addr addr; 431 432 if (!idev) 433 return; 434 dev = idev->dev; 435 if (dev && (dev->flags & IFF_MULTICAST)) { 436 ipv6_addr_all_routers(&addr); 437 438 if (idev->cnf.forwarding) 439 ipv6_dev_mc_inc(dev, &addr); 440 else 441 ipv6_dev_mc_dec(dev, &addr); 442 } 443 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 444 if (ifa->flags&IFA_F_TENTATIVE) 445 continue; 446 if (idev->cnf.forwarding) 447 addrconf_join_anycast(ifa); 448 else 449 addrconf_leave_anycast(ifa); 450 } 451 } 452 453 454 static void addrconf_forward_change(void) 455 { 456 struct net_device *dev; 457 struct inet6_dev *idev; 458 459 read_lock(&dev_base_lock); 460 for_each_netdev(&init_net, dev) { 461 rcu_read_lock(); 462 idev = __in6_dev_get(dev); 463 if (idev) { 464 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); 465 idev->cnf.forwarding = ipv6_devconf.forwarding; 466 if (changed) 467 dev_forward_change(idev); 468 } 469 rcu_read_unlock(); 470 } 471 read_unlock(&dev_base_lock); 472 } 473 #endif 474 475 /* Nobody refers to this ifaddr, destroy it */ 476 477 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 478 { 479 BUG_TRAP(ifp->if_next==NULL); 480 BUG_TRAP(ifp->lst_next==NULL); 481 #ifdef NET_REFCNT_DEBUG 482 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 483 #endif 484 485 in6_dev_put(ifp->idev); 486 487 if (del_timer(&ifp->timer)) 488 printk("Timer is still running, when freeing ifa=%p\n", ifp); 489 490 if (!ifp->dead) { 491 printk("Freeing alive inet6 address %p\n", ifp); 492 return; 493 } 494 dst_release(&ifp->rt->u.dst); 495 496 kfree(ifp); 497 } 498 499 static void 500 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 501 { 502 struct inet6_ifaddr *ifa, **ifap; 503 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 504 505 /* 506 * Each device address list is sorted in order of scope - 507 * global before linklocal. 508 */ 509 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 510 ifap = &ifa->if_next) { 511 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 512 break; 513 } 514 515 ifp->if_next = *ifap; 516 *ifap = ifp; 517 } 518 519 /* On success it returns ifp with increased reference count */ 520 521 static struct inet6_ifaddr * 522 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 523 int scope, u32 flags) 524 { 525 struct inet6_ifaddr *ifa = NULL; 526 struct rt6_info *rt; 527 int hash; 528 int err = 0; 529 530 rcu_read_lock_bh(); 531 if (idev->dead) { 532 err = -ENODEV; /*XXX*/ 533 goto out2; 534 } 535 536 write_lock(&addrconf_hash_lock); 537 538 /* Ignore adding duplicate addresses on an interface */ 539 if (ipv6_chk_same_addr(addr, idev->dev)) { 540 ADBG(("ipv6_add_addr: already assigned\n")); 541 err = -EEXIST; 542 goto out; 543 } 544 545 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 546 547 if (ifa == NULL) { 548 ADBG(("ipv6_add_addr: malloc failed\n")); 549 err = -ENOBUFS; 550 goto out; 551 } 552 553 rt = addrconf_dst_alloc(idev, addr, 0); 554 if (IS_ERR(rt)) { 555 err = PTR_ERR(rt); 556 goto out; 557 } 558 559 ipv6_addr_copy(&ifa->addr, addr); 560 561 spin_lock_init(&ifa->lock); 562 init_timer(&ifa->timer); 563 ifa->timer.data = (unsigned long) ifa; 564 ifa->scope = scope; 565 ifa->prefix_len = pfxlen; 566 ifa->flags = flags | IFA_F_TENTATIVE; 567 ifa->cstamp = ifa->tstamp = jiffies; 568 569 ifa->rt = rt; 570 571 /* 572 * part one of RFC 4429, section 3.3 573 * We should not configure an address as 574 * optimistic if we do not yet know the link 575 * layer address of our nexhop router 576 */ 577 578 if (rt->rt6i_nexthop == NULL) 579 ifa->flags &= ~IFA_F_OPTIMISTIC; 580 581 ifa->idev = idev; 582 in6_dev_hold(idev); 583 /* For caller */ 584 in6_ifa_hold(ifa); 585 586 /* Add to big hash table */ 587 hash = ipv6_addr_hash(addr); 588 589 ifa->lst_next = inet6_addr_lst[hash]; 590 inet6_addr_lst[hash] = ifa; 591 in6_ifa_hold(ifa); 592 write_unlock(&addrconf_hash_lock); 593 594 write_lock(&idev->lock); 595 /* Add to inet6_dev unicast addr list. */ 596 ipv6_link_dev_addr(idev, ifa); 597 598 #ifdef CONFIG_IPV6_PRIVACY 599 if (ifa->flags&IFA_F_TEMPORARY) { 600 ifa->tmp_next = idev->tempaddr_list; 601 idev->tempaddr_list = ifa; 602 in6_ifa_hold(ifa); 603 } 604 #endif 605 606 in6_ifa_hold(ifa); 607 write_unlock(&idev->lock); 608 out2: 609 rcu_read_unlock_bh(); 610 611 if (likely(err == 0)) 612 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 613 else { 614 kfree(ifa); 615 ifa = ERR_PTR(err); 616 } 617 618 return ifa; 619 out: 620 write_unlock(&addrconf_hash_lock); 621 goto out2; 622 } 623 624 /* This function wants to get referenced ifp and releases it before return */ 625 626 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 627 { 628 struct inet6_ifaddr *ifa, **ifap; 629 struct inet6_dev *idev = ifp->idev; 630 int hash; 631 int deleted = 0, onlink = 0; 632 unsigned long expires = jiffies; 633 634 hash = ipv6_addr_hash(&ifp->addr); 635 636 ifp->dead = 1; 637 638 write_lock_bh(&addrconf_hash_lock); 639 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 640 ifap = &ifa->lst_next) { 641 if (ifa == ifp) { 642 *ifap = ifa->lst_next; 643 __in6_ifa_put(ifp); 644 ifa->lst_next = NULL; 645 break; 646 } 647 } 648 write_unlock_bh(&addrconf_hash_lock); 649 650 write_lock_bh(&idev->lock); 651 #ifdef CONFIG_IPV6_PRIVACY 652 if (ifp->flags&IFA_F_TEMPORARY) { 653 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 654 ifap = &ifa->tmp_next) { 655 if (ifa == ifp) { 656 *ifap = ifa->tmp_next; 657 if (ifp->ifpub) { 658 in6_ifa_put(ifp->ifpub); 659 ifp->ifpub = NULL; 660 } 661 __in6_ifa_put(ifp); 662 ifa->tmp_next = NULL; 663 break; 664 } 665 } 666 } 667 #endif 668 669 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 670 if (ifa == ifp) { 671 *ifap = ifa->if_next; 672 __in6_ifa_put(ifp); 673 ifa->if_next = NULL; 674 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 675 break; 676 deleted = 1; 677 continue; 678 } else if (ifp->flags & IFA_F_PERMANENT) { 679 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 680 ifp->prefix_len)) { 681 if (ifa->flags & IFA_F_PERMANENT) { 682 onlink = 1; 683 if (deleted) 684 break; 685 } else { 686 unsigned long lifetime; 687 688 if (!onlink) 689 onlink = -1; 690 691 spin_lock(&ifa->lock); 692 lifetime = min_t(unsigned long, 693 ifa->valid_lft, 0x7fffffffUL/HZ); 694 if (time_before(expires, 695 ifa->tstamp + lifetime * HZ)) 696 expires = ifa->tstamp + lifetime * HZ; 697 spin_unlock(&ifa->lock); 698 } 699 } 700 } 701 ifap = &ifa->if_next; 702 } 703 write_unlock_bh(&idev->lock); 704 705 ipv6_ifa_notify(RTM_DELADDR, ifp); 706 707 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 708 709 addrconf_del_timer(ifp); 710 711 /* 712 * Purge or update corresponding prefix 713 * 714 * 1) we don't purge prefix here if address was not permanent. 715 * prefix is managed by its own lifetime. 716 * 2) if there're no addresses, delete prefix. 717 * 3) if there're still other permanent address(es), 718 * corresponding prefix is still permanent. 719 * 4) otherwise, update prefix lifetime to the 720 * longest valid lifetime among the corresponding 721 * addresses on the device. 722 * Note: subsequent RA will update lifetime. 723 * 724 * --yoshfuji 725 */ 726 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 727 struct in6_addr prefix; 728 struct rt6_info *rt; 729 730 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 731 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 732 733 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 734 if (onlink == 0) { 735 ip6_del_rt(rt); 736 rt = NULL; 737 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 738 rt->rt6i_expires = expires; 739 rt->rt6i_flags |= RTF_EXPIRES; 740 } 741 } 742 dst_release(&rt->u.dst); 743 } 744 745 in6_ifa_put(ifp); 746 } 747 748 #ifdef CONFIG_IPV6_PRIVACY 749 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 750 { 751 struct inet6_dev *idev = ifp->idev; 752 struct in6_addr addr, *tmpaddr; 753 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 754 int tmp_plen; 755 int ret = 0; 756 int max_addresses; 757 u32 addr_flags; 758 759 write_lock(&idev->lock); 760 if (ift) { 761 spin_lock_bh(&ift->lock); 762 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 763 spin_unlock_bh(&ift->lock); 764 tmpaddr = &addr; 765 } else { 766 tmpaddr = NULL; 767 } 768 retry: 769 in6_dev_hold(idev); 770 if (idev->cnf.use_tempaddr <= 0) { 771 write_unlock(&idev->lock); 772 printk(KERN_INFO 773 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 774 in6_dev_put(idev); 775 ret = -1; 776 goto out; 777 } 778 spin_lock_bh(&ifp->lock); 779 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 780 idev->cnf.use_tempaddr = -1; /*XXX*/ 781 spin_unlock_bh(&ifp->lock); 782 write_unlock(&idev->lock); 783 printk(KERN_WARNING 784 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 785 in6_dev_put(idev); 786 ret = -1; 787 goto out; 788 } 789 in6_ifa_hold(ifp); 790 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 791 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 792 spin_unlock_bh(&ifp->lock); 793 write_unlock(&idev->lock); 794 printk(KERN_WARNING 795 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 796 in6_ifa_put(ifp); 797 in6_dev_put(idev); 798 ret = -1; 799 goto out; 800 } 801 memcpy(&addr.s6_addr[8], idev->rndid, 8); 802 tmp_valid_lft = min_t(__u32, 803 ifp->valid_lft, 804 idev->cnf.temp_valid_lft); 805 tmp_prefered_lft = min_t(__u32, 806 ifp->prefered_lft, 807 idev->cnf.temp_prefered_lft - desync_factor / HZ); 808 tmp_plen = ifp->prefix_len; 809 max_addresses = idev->cnf.max_addresses; 810 tmp_cstamp = ifp->cstamp; 811 tmp_tstamp = ifp->tstamp; 812 spin_unlock_bh(&ifp->lock); 813 814 write_unlock(&idev->lock); 815 816 addr_flags = IFA_F_TEMPORARY; 817 /* set in addrconf_prefix_rcv() */ 818 if (ifp->flags & IFA_F_OPTIMISTIC) 819 addr_flags |= IFA_F_OPTIMISTIC; 820 821 ift = !max_addresses || 822 ipv6_count_addresses(idev) < max_addresses ? 823 ipv6_add_addr(idev, &addr, tmp_plen, 824 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 825 addr_flags) : NULL; 826 if (!ift || IS_ERR(ift)) { 827 in6_ifa_put(ifp); 828 in6_dev_put(idev); 829 printk(KERN_INFO 830 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 831 tmpaddr = &addr; 832 write_lock(&idev->lock); 833 goto retry; 834 } 835 836 spin_lock_bh(&ift->lock); 837 ift->ifpub = ifp; 838 ift->valid_lft = tmp_valid_lft; 839 ift->prefered_lft = tmp_prefered_lft; 840 ift->cstamp = tmp_cstamp; 841 ift->tstamp = tmp_tstamp; 842 spin_unlock_bh(&ift->lock); 843 844 addrconf_dad_start(ift, 0); 845 in6_ifa_put(ift); 846 in6_dev_put(idev); 847 out: 848 return ret; 849 } 850 #endif 851 852 /* 853 * Choose an appropriate source address (RFC3484) 854 */ 855 struct ipv6_saddr_score { 856 int addr_type; 857 unsigned int attrs; 858 int matchlen; 859 int scope; 860 unsigned int rule; 861 }; 862 863 #define IPV6_SADDR_SCORE_LOCAL 0x0001 864 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 865 #define IPV6_SADDR_SCORE_HOA 0x0008 866 #define IPV6_SADDR_SCORE_OIF 0x0010 867 #define IPV6_SADDR_SCORE_LABEL 0x0020 868 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 869 870 static inline int ipv6_saddr_preferred(int type) 871 { 872 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 873 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 874 return 1; 875 return 0; 876 } 877 878 /* static matching label */ 879 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type) 880 { 881 /* 882 * prefix (longest match) label 883 * ----------------------------- 884 * ::1/128 0 885 * ::/0 1 886 * 2002::/16 2 887 * ::/96 3 888 * ::ffff:0:0/96 4 889 * fc00::/7 5 890 * 2001::/32 6 891 */ 892 if (type & IPV6_ADDR_LOOPBACK) 893 return 0; 894 else if (type & IPV6_ADDR_COMPATv4) 895 return 3; 896 else if (type & IPV6_ADDR_MAPPED) 897 return 4; 898 else if (addr->s6_addr32[0] == htonl(0x20010000)) 899 return 6; 900 else if (addr->s6_addr16[0] == htons(0x2002)) 901 return 2; 902 else if ((addr->s6_addr[0] & 0xfe) == 0xfc) 903 return 5; 904 return 1; 905 } 906 907 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 908 struct in6_addr *daddr, struct in6_addr *saddr) 909 { 910 struct ipv6_saddr_score hiscore; 911 struct inet6_ifaddr *ifa_result = NULL; 912 int daddr_type = __ipv6_addr_type(daddr); 913 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 914 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type); 915 struct net_device *dev; 916 917 memset(&hiscore, 0, sizeof(hiscore)); 918 919 read_lock(&dev_base_lock); 920 rcu_read_lock(); 921 922 for_each_netdev(&init_net, dev) { 923 struct inet6_dev *idev; 924 struct inet6_ifaddr *ifa; 925 926 /* Rule 0: Candidate Source Address (section 4) 927 * - multicast and link-local destination address, 928 * the set of candidate source address MUST only 929 * include addresses assigned to interfaces 930 * belonging to the same link as the outgoing 931 * interface. 932 * (- For site-local destination addresses, the 933 * set of candidate source addresses MUST only 934 * include addresses assigned to interfaces 935 * belonging to the same site as the outgoing 936 * interface.) 937 */ 938 if ((daddr_type & IPV6_ADDR_MULTICAST || 939 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 940 daddr_dev && dev != daddr_dev) 941 continue; 942 943 idev = __in6_dev_get(dev); 944 if (!idev) 945 continue; 946 947 read_lock_bh(&idev->lock); 948 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 949 struct ipv6_saddr_score score; 950 951 score.addr_type = __ipv6_addr_type(&ifa->addr); 952 953 /* Rule 0: 954 * - Tentative Address (RFC2462 section 5.4) 955 * - A tentative address is not considered 956 * "assigned to an interface" in the traditional 957 * sense, unless it is also flagged as optimistic. 958 * - Candidate Source Address (section 4) 959 * - In any case, anycast addresses, multicast 960 * addresses, and the unspecified address MUST 961 * NOT be included in a candidate set. 962 */ 963 if ((ifa->flags & IFA_F_TENTATIVE) && 964 (!(ifa->flags & IFA_F_OPTIMISTIC))) 965 continue; 966 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 967 score.addr_type & IPV6_ADDR_MULTICAST)) { 968 LIMIT_NETDEBUG(KERN_DEBUG 969 "ADDRCONF: unspecified / multicast address" 970 "assigned as unicast address on %s", 971 dev->name); 972 continue; 973 } 974 975 score.attrs = 0; 976 score.matchlen = 0; 977 score.scope = 0; 978 score.rule = 0; 979 980 if (ifa_result == NULL) { 981 /* record it if the first available entry */ 982 goto record_it; 983 } 984 985 /* Rule 1: Prefer same address */ 986 if (hiscore.rule < 1) { 987 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 988 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 989 hiscore.rule++; 990 } 991 if (ipv6_addr_equal(&ifa->addr, daddr)) { 992 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 993 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 994 score.rule = 1; 995 goto record_it; 996 } 997 } else { 998 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 999 continue; 1000 } 1001 1002 /* Rule 2: Prefer appropriate scope */ 1003 if (hiscore.rule < 2) { 1004 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 1005 hiscore.rule++; 1006 } 1007 score.scope = __ipv6_addr_src_scope(score.addr_type); 1008 if (hiscore.scope < score.scope) { 1009 if (hiscore.scope < daddr_scope) { 1010 score.rule = 2; 1011 goto record_it; 1012 } else 1013 continue; 1014 } else if (score.scope < hiscore.scope) { 1015 if (score.scope < daddr_scope) 1016 break; /* addresses sorted by scope */ 1017 else { 1018 score.rule = 2; 1019 goto record_it; 1020 } 1021 } 1022 1023 /* Rule 3: Avoid deprecated and optimistic addresses */ 1024 if (hiscore.rule < 3) { 1025 if (ipv6_saddr_preferred(hiscore.addr_type) || 1026 (((ifa_result->flags & 1027 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) 1028 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1029 hiscore.rule++; 1030 } 1031 if (ipv6_saddr_preferred(score.addr_type) || 1032 (((ifa->flags & 1033 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) { 1034 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1035 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 1036 score.rule = 3; 1037 goto record_it; 1038 } 1039 } else { 1040 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 1041 continue; 1042 } 1043 1044 /* Rule 4: Prefer home address */ 1045 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 1046 if (hiscore.rule < 4) { 1047 if (ifa_result->flags & IFA_F_HOMEADDRESS) 1048 hiscore.attrs |= IPV6_SADDR_SCORE_HOA; 1049 hiscore.rule++; 1050 } 1051 if (ifa->flags & IFA_F_HOMEADDRESS) { 1052 score.attrs |= IPV6_SADDR_SCORE_HOA; 1053 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) { 1054 score.rule = 4; 1055 goto record_it; 1056 } 1057 } else { 1058 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA) 1059 continue; 1060 } 1061 #else 1062 if (hiscore.rule < 4) 1063 hiscore.rule++; 1064 #endif 1065 1066 /* Rule 5: Prefer outgoing interface */ 1067 if (hiscore.rule < 5) { 1068 if (daddr_dev == NULL || 1069 daddr_dev == ifa_result->idev->dev) 1070 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1071 hiscore.rule++; 1072 } 1073 if (daddr_dev == NULL || 1074 daddr_dev == ifa->idev->dev) { 1075 score.attrs |= IPV6_SADDR_SCORE_OIF; 1076 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1077 score.rule = 5; 1078 goto record_it; 1079 } 1080 } else { 1081 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1082 continue; 1083 } 1084 1085 /* Rule 6: Prefer matching label */ 1086 if (hiscore.rule < 6) { 1087 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) 1088 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1089 hiscore.rule++; 1090 } 1091 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { 1092 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1093 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1094 score.rule = 6; 1095 goto record_it; 1096 } 1097 } else { 1098 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1099 continue; 1100 } 1101 1102 #ifdef CONFIG_IPV6_PRIVACY 1103 /* Rule 7: Prefer public address 1104 * Note: prefer temprary address if use_tempaddr >= 2 1105 */ 1106 if (hiscore.rule < 7) { 1107 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1108 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1109 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1110 hiscore.rule++; 1111 } 1112 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1113 (ifa->idev->cnf.use_tempaddr >= 2)) { 1114 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1115 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1116 score.rule = 7; 1117 goto record_it; 1118 } 1119 } else { 1120 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1121 continue; 1122 } 1123 #else 1124 if (hiscore.rule < 7) 1125 hiscore.rule++; 1126 #endif 1127 /* Rule 8: Use longest matching prefix */ 1128 if (hiscore.rule < 8) { 1129 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1130 hiscore.rule++; 1131 } 1132 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1133 if (score.matchlen > hiscore.matchlen) { 1134 score.rule = 8; 1135 goto record_it; 1136 } 1137 #if 0 1138 else if (score.matchlen < hiscore.matchlen) 1139 continue; 1140 #endif 1141 1142 /* Final Rule: choose first available one */ 1143 continue; 1144 record_it: 1145 if (ifa_result) 1146 in6_ifa_put(ifa_result); 1147 in6_ifa_hold(ifa); 1148 ifa_result = ifa; 1149 hiscore = score; 1150 } 1151 read_unlock_bh(&idev->lock); 1152 } 1153 rcu_read_unlock(); 1154 read_unlock(&dev_base_lock); 1155 1156 if (!ifa_result) 1157 return -EADDRNOTAVAIL; 1158 1159 ipv6_addr_copy(saddr, &ifa_result->addr); 1160 in6_ifa_put(ifa_result); 1161 return 0; 1162 } 1163 1164 1165 int ipv6_get_saddr(struct dst_entry *dst, 1166 struct in6_addr *daddr, struct in6_addr *saddr) 1167 { 1168 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr); 1169 } 1170 1171 EXPORT_SYMBOL(ipv6_get_saddr); 1172 1173 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1174 unsigned char banned_flags) 1175 { 1176 struct inet6_dev *idev; 1177 int err = -EADDRNOTAVAIL; 1178 1179 rcu_read_lock(); 1180 if ((idev = __in6_dev_get(dev)) != NULL) { 1181 struct inet6_ifaddr *ifp; 1182 1183 read_lock_bh(&idev->lock); 1184 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1185 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1186 ipv6_addr_copy(addr, &ifp->addr); 1187 err = 0; 1188 break; 1189 } 1190 } 1191 read_unlock_bh(&idev->lock); 1192 } 1193 rcu_read_unlock(); 1194 return err; 1195 } 1196 1197 static int ipv6_count_addresses(struct inet6_dev *idev) 1198 { 1199 int cnt = 0; 1200 struct inet6_ifaddr *ifp; 1201 1202 read_lock_bh(&idev->lock); 1203 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1204 cnt++; 1205 read_unlock_bh(&idev->lock); 1206 return cnt; 1207 } 1208 1209 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1210 { 1211 struct inet6_ifaddr * ifp; 1212 u8 hash = ipv6_addr_hash(addr); 1213 1214 read_lock_bh(&addrconf_hash_lock); 1215 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1216 if (ipv6_addr_equal(&ifp->addr, addr) && 1217 !(ifp->flags&IFA_F_TENTATIVE)) { 1218 if (dev == NULL || ifp->idev->dev == dev || 1219 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1220 break; 1221 } 1222 } 1223 read_unlock_bh(&addrconf_hash_lock); 1224 return ifp != NULL; 1225 } 1226 1227 EXPORT_SYMBOL(ipv6_chk_addr); 1228 1229 static 1230 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1231 { 1232 struct inet6_ifaddr * ifp; 1233 u8 hash = ipv6_addr_hash(addr); 1234 1235 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1236 if (ipv6_addr_equal(&ifp->addr, addr)) { 1237 if (dev == NULL || ifp->idev->dev == dev) 1238 break; 1239 } 1240 } 1241 return ifp != NULL; 1242 } 1243 1244 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1245 { 1246 struct inet6_ifaddr * ifp; 1247 u8 hash = ipv6_addr_hash(addr); 1248 1249 read_lock_bh(&addrconf_hash_lock); 1250 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1251 if (ipv6_addr_equal(&ifp->addr, addr)) { 1252 if (dev == NULL || ifp->idev->dev == dev || 1253 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1254 in6_ifa_hold(ifp); 1255 break; 1256 } 1257 } 1258 } 1259 read_unlock_bh(&addrconf_hash_lock); 1260 1261 return ifp; 1262 } 1263 1264 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1265 { 1266 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1267 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1268 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1269 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1270 int sk_ipv6only = ipv6_only_sock(sk); 1271 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1272 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1273 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1274 1275 if (!sk2_rcv_saddr && !sk_ipv6only) 1276 return 1; 1277 1278 if (addr_type2 == IPV6_ADDR_ANY && 1279 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1280 return 1; 1281 1282 if (addr_type == IPV6_ADDR_ANY && 1283 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1284 return 1; 1285 1286 if (sk2_rcv_saddr6 && 1287 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1288 return 1; 1289 1290 if (addr_type == IPV6_ADDR_MAPPED && 1291 !sk2_ipv6only && 1292 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1293 return 1; 1294 1295 return 0; 1296 } 1297 1298 /* Gets referenced address, destroys ifaddr */ 1299 1300 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1301 { 1302 if (ifp->flags&IFA_F_PERMANENT) { 1303 spin_lock_bh(&ifp->lock); 1304 addrconf_del_timer(ifp); 1305 ifp->flags |= IFA_F_TENTATIVE; 1306 spin_unlock_bh(&ifp->lock); 1307 in6_ifa_put(ifp); 1308 #ifdef CONFIG_IPV6_PRIVACY 1309 } else if (ifp->flags&IFA_F_TEMPORARY) { 1310 struct inet6_ifaddr *ifpub; 1311 spin_lock_bh(&ifp->lock); 1312 ifpub = ifp->ifpub; 1313 if (ifpub) { 1314 in6_ifa_hold(ifpub); 1315 spin_unlock_bh(&ifp->lock); 1316 ipv6_create_tempaddr(ifpub, ifp); 1317 in6_ifa_put(ifpub); 1318 } else { 1319 spin_unlock_bh(&ifp->lock); 1320 } 1321 ipv6_del_addr(ifp); 1322 #endif 1323 } else 1324 ipv6_del_addr(ifp); 1325 } 1326 1327 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1328 { 1329 if (net_ratelimit()) 1330 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1331 addrconf_dad_stop(ifp); 1332 } 1333 1334 /* Join to solicited addr multicast group. */ 1335 1336 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1337 { 1338 struct in6_addr maddr; 1339 1340 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1341 return; 1342 1343 addrconf_addr_solict_mult(addr, &maddr); 1344 ipv6_dev_mc_inc(dev, &maddr); 1345 } 1346 1347 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1348 { 1349 struct in6_addr maddr; 1350 1351 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1352 return; 1353 1354 addrconf_addr_solict_mult(addr, &maddr); 1355 __ipv6_dev_mc_dec(idev, &maddr); 1356 } 1357 1358 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1359 { 1360 struct in6_addr addr; 1361 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1362 if (ipv6_addr_any(&addr)) 1363 return; 1364 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1365 } 1366 1367 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1368 { 1369 struct in6_addr addr; 1370 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1371 if (ipv6_addr_any(&addr)) 1372 return; 1373 __ipv6_dev_ac_dec(ifp->idev, &addr); 1374 } 1375 1376 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1377 { 1378 if (dev->addr_len != ETH_ALEN) 1379 return -1; 1380 memcpy(eui, dev->dev_addr, 3); 1381 memcpy(eui + 5, dev->dev_addr + 3, 3); 1382 1383 /* 1384 * The zSeries OSA network cards can be shared among various 1385 * OS instances, but the OSA cards have only one MAC address. 1386 * This leads to duplicate address conflicts in conjunction 1387 * with IPv6 if more than one instance uses the same card. 1388 * 1389 * The driver for these cards can deliver a unique 16-bit 1390 * identifier for each instance sharing the same card. It is 1391 * placed instead of 0xFFFE in the interface identifier. The 1392 * "u" bit of the interface identifier is not inverted in this 1393 * case. Hence the resulting interface identifier has local 1394 * scope according to RFC2373. 1395 */ 1396 if (dev->dev_id) { 1397 eui[3] = (dev->dev_id >> 8) & 0xFF; 1398 eui[4] = dev->dev_id & 0xFF; 1399 } else { 1400 eui[3] = 0xFF; 1401 eui[4] = 0xFE; 1402 eui[0] ^= 2; 1403 } 1404 return 0; 1405 } 1406 1407 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1408 { 1409 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1410 if (dev->addr_len != ARCNET_ALEN) 1411 return -1; 1412 memset(eui, 0, 7); 1413 eui[7] = *(u8*)dev->dev_addr; 1414 return 0; 1415 } 1416 1417 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1418 { 1419 if (dev->addr_len != INFINIBAND_ALEN) 1420 return -1; 1421 memcpy(eui, dev->dev_addr + 12, 8); 1422 eui[0] |= 2; 1423 return 0; 1424 } 1425 1426 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1427 { 1428 switch (dev->type) { 1429 case ARPHRD_ETHER: 1430 case ARPHRD_FDDI: 1431 case ARPHRD_IEEE802_TR: 1432 return addrconf_ifid_eui48(eui, dev); 1433 case ARPHRD_ARCNET: 1434 return addrconf_ifid_arcnet(eui, dev); 1435 case ARPHRD_INFINIBAND: 1436 return addrconf_ifid_infiniband(eui, dev); 1437 } 1438 return -1; 1439 } 1440 1441 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1442 { 1443 int err = -1; 1444 struct inet6_ifaddr *ifp; 1445 1446 read_lock_bh(&idev->lock); 1447 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1448 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1449 memcpy(eui, ifp->addr.s6_addr+8, 8); 1450 err = 0; 1451 break; 1452 } 1453 } 1454 read_unlock_bh(&idev->lock); 1455 return err; 1456 } 1457 1458 #ifdef CONFIG_IPV6_PRIVACY 1459 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1460 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1461 { 1462 regen: 1463 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1464 idev->rndid[0] &= ~0x02; 1465 1466 /* 1467 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1468 * check if generated address is not inappropriate 1469 * 1470 * - Reserved subnet anycast (RFC 2526) 1471 * 11111101 11....11 1xxxxxxx 1472 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 1473 * 00-00-5E-FE-xx-xx-xx-xx 1474 * - value 0 1475 * - XXX: already assigned to an address on the device 1476 */ 1477 if (idev->rndid[0] == 0xfd && 1478 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1479 (idev->rndid[7]&0x80)) 1480 goto regen; 1481 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1482 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1483 goto regen; 1484 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1485 goto regen; 1486 } 1487 1488 return 0; 1489 } 1490 1491 static void ipv6_regen_rndid(unsigned long data) 1492 { 1493 struct inet6_dev *idev = (struct inet6_dev *) data; 1494 unsigned long expires; 1495 1496 rcu_read_lock_bh(); 1497 write_lock_bh(&idev->lock); 1498 1499 if (idev->dead) 1500 goto out; 1501 1502 if (__ipv6_regen_rndid(idev) < 0) 1503 goto out; 1504 1505 expires = jiffies + 1506 idev->cnf.temp_prefered_lft * HZ - 1507 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1508 if (time_before(expires, jiffies)) { 1509 printk(KERN_WARNING 1510 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1511 idev->dev->name); 1512 goto out; 1513 } 1514 1515 if (!mod_timer(&idev->regen_timer, expires)) 1516 in6_dev_hold(idev); 1517 1518 out: 1519 write_unlock_bh(&idev->lock); 1520 rcu_read_unlock_bh(); 1521 in6_dev_put(idev); 1522 } 1523 1524 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1525 int ret = 0; 1526 1527 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1528 ret = __ipv6_regen_rndid(idev); 1529 return ret; 1530 } 1531 #endif 1532 1533 /* 1534 * Add prefix route. 1535 */ 1536 1537 static void 1538 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1539 unsigned long expires, u32 flags) 1540 { 1541 struct fib6_config cfg = { 1542 .fc_table = RT6_TABLE_PREFIX, 1543 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1544 .fc_ifindex = dev->ifindex, 1545 .fc_expires = expires, 1546 .fc_dst_len = plen, 1547 .fc_flags = RTF_UP | flags, 1548 }; 1549 1550 ipv6_addr_copy(&cfg.fc_dst, pfx); 1551 1552 /* Prevent useless cloning on PtP SIT. 1553 This thing is done here expecting that the whole 1554 class of non-broadcast devices need not cloning. 1555 */ 1556 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1557 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1558 cfg.fc_flags |= RTF_NONEXTHOP; 1559 #endif 1560 1561 ip6_route_add(&cfg); 1562 } 1563 1564 /* Create "default" multicast route to the interface */ 1565 1566 static void addrconf_add_mroute(struct net_device *dev) 1567 { 1568 struct fib6_config cfg = { 1569 .fc_table = RT6_TABLE_LOCAL, 1570 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1571 .fc_ifindex = dev->ifindex, 1572 .fc_dst_len = 8, 1573 .fc_flags = RTF_UP, 1574 }; 1575 1576 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1577 1578 ip6_route_add(&cfg); 1579 } 1580 1581 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1582 static void sit_route_add(struct net_device *dev) 1583 { 1584 struct fib6_config cfg = { 1585 .fc_table = RT6_TABLE_MAIN, 1586 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1587 .fc_ifindex = dev->ifindex, 1588 .fc_dst_len = 96, 1589 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1590 }; 1591 1592 /* prefix length - 96 bits "::d.d.d.d" */ 1593 ip6_route_add(&cfg); 1594 } 1595 #endif 1596 1597 static void addrconf_add_lroute(struct net_device *dev) 1598 { 1599 struct in6_addr addr; 1600 1601 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1602 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1603 } 1604 1605 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1606 { 1607 struct inet6_dev *idev; 1608 1609 ASSERT_RTNL(); 1610 1611 if ((idev = ipv6_find_idev(dev)) == NULL) 1612 return NULL; 1613 1614 /* Add default multicast route */ 1615 addrconf_add_mroute(dev); 1616 1617 /* Add link local route */ 1618 addrconf_add_lroute(dev); 1619 return idev; 1620 } 1621 1622 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1623 { 1624 struct prefix_info *pinfo; 1625 __u32 valid_lft; 1626 __u32 prefered_lft; 1627 int addr_type; 1628 unsigned long rt_expires; 1629 struct inet6_dev *in6_dev; 1630 1631 pinfo = (struct prefix_info *) opt; 1632 1633 if (len < sizeof(struct prefix_info)) { 1634 ADBG(("addrconf: prefix option too short\n")); 1635 return; 1636 } 1637 1638 /* 1639 * Validation checks ([ADDRCONF], page 19) 1640 */ 1641 1642 addr_type = ipv6_addr_type(&pinfo->prefix); 1643 1644 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1645 return; 1646 1647 valid_lft = ntohl(pinfo->valid); 1648 prefered_lft = ntohl(pinfo->prefered); 1649 1650 if (prefered_lft > valid_lft) { 1651 if (net_ratelimit()) 1652 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1653 return; 1654 } 1655 1656 in6_dev = in6_dev_get(dev); 1657 1658 if (in6_dev == NULL) { 1659 if (net_ratelimit()) 1660 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1661 return; 1662 } 1663 1664 /* 1665 * Two things going on here: 1666 * 1) Add routes for on-link prefixes 1667 * 2) Configure prefixes with the auto flag set 1668 */ 1669 1670 /* Avoid arithmetic overflow. Really, we could 1671 save rt_expires in seconds, likely valid_lft, 1672 but it would require division in fib gc, that it 1673 not good. 1674 */ 1675 if (valid_lft >= 0x7FFFFFFF/HZ) 1676 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1677 else 1678 rt_expires = valid_lft * HZ; 1679 1680 /* 1681 * We convert this (in jiffies) to clock_t later. 1682 * Avoid arithmetic overflow there as well. 1683 * Overflow can happen only if HZ < USER_HZ. 1684 */ 1685 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1686 rt_expires = 0x7FFFFFFF / USER_HZ; 1687 1688 if (pinfo->onlink) { 1689 struct rt6_info *rt; 1690 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1691 1692 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1693 if (rt->rt6i_flags&RTF_EXPIRES) { 1694 if (valid_lft == 0) { 1695 ip6_del_rt(rt); 1696 rt = NULL; 1697 } else { 1698 rt->rt6i_expires = jiffies + rt_expires; 1699 } 1700 } 1701 } else if (valid_lft) { 1702 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1703 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1704 } 1705 if (rt) 1706 dst_release(&rt->u.dst); 1707 } 1708 1709 /* Try to figure out our local address for this prefix */ 1710 1711 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1712 struct inet6_ifaddr * ifp; 1713 struct in6_addr addr; 1714 int create = 0, update_lft = 0; 1715 1716 if (pinfo->prefix_len == 64) { 1717 memcpy(&addr, &pinfo->prefix, 8); 1718 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1719 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1720 in6_dev_put(in6_dev); 1721 return; 1722 } 1723 goto ok; 1724 } 1725 if (net_ratelimit()) 1726 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1727 pinfo->prefix_len); 1728 in6_dev_put(in6_dev); 1729 return; 1730 1731 ok: 1732 1733 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1734 1735 if (ifp == NULL && valid_lft) { 1736 int max_addresses = in6_dev->cnf.max_addresses; 1737 u32 addr_flags = 0; 1738 1739 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1740 if (in6_dev->cnf.optimistic_dad && 1741 !ipv6_devconf.forwarding) 1742 addr_flags = IFA_F_OPTIMISTIC; 1743 #endif 1744 1745 /* Do not allow to create too much of autoconfigured 1746 * addresses; this would be too easy way to crash kernel. 1747 */ 1748 if (!max_addresses || 1749 ipv6_count_addresses(in6_dev) < max_addresses) 1750 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1751 addr_type&IPV6_ADDR_SCOPE_MASK, 1752 addr_flags); 1753 1754 if (!ifp || IS_ERR(ifp)) { 1755 in6_dev_put(in6_dev); 1756 return; 1757 } 1758 1759 update_lft = create = 1; 1760 ifp->cstamp = jiffies; 1761 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1762 } 1763 1764 if (ifp) { 1765 int flags; 1766 unsigned long now; 1767 #ifdef CONFIG_IPV6_PRIVACY 1768 struct inet6_ifaddr *ift; 1769 #endif 1770 u32 stored_lft; 1771 1772 /* update lifetime (RFC2462 5.5.3 e) */ 1773 spin_lock(&ifp->lock); 1774 now = jiffies; 1775 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1776 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1777 else 1778 stored_lft = 0; 1779 if (!update_lft && stored_lft) { 1780 if (valid_lft > MIN_VALID_LIFETIME || 1781 valid_lft > stored_lft) 1782 update_lft = 1; 1783 else if (stored_lft <= MIN_VALID_LIFETIME) { 1784 /* valid_lft <= stored_lft is always true */ 1785 /* XXX: IPsec */ 1786 update_lft = 0; 1787 } else { 1788 valid_lft = MIN_VALID_LIFETIME; 1789 if (valid_lft < prefered_lft) 1790 prefered_lft = valid_lft; 1791 update_lft = 1; 1792 } 1793 } 1794 1795 if (update_lft) { 1796 ifp->valid_lft = valid_lft; 1797 ifp->prefered_lft = prefered_lft; 1798 ifp->tstamp = now; 1799 flags = ifp->flags; 1800 ifp->flags &= ~IFA_F_DEPRECATED; 1801 spin_unlock(&ifp->lock); 1802 1803 if (!(flags&IFA_F_TENTATIVE)) 1804 ipv6_ifa_notify(0, ifp); 1805 } else 1806 spin_unlock(&ifp->lock); 1807 1808 #ifdef CONFIG_IPV6_PRIVACY 1809 read_lock_bh(&in6_dev->lock); 1810 /* update all temporary addresses in the list */ 1811 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1812 /* 1813 * When adjusting the lifetimes of an existing 1814 * temporary address, only lower the lifetimes. 1815 * Implementations must not increase the 1816 * lifetimes of an existing temporary address 1817 * when processing a Prefix Information Option. 1818 */ 1819 spin_lock(&ift->lock); 1820 flags = ift->flags; 1821 if (ift->valid_lft > valid_lft && 1822 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1823 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1824 if (ift->prefered_lft > prefered_lft && 1825 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1826 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1827 spin_unlock(&ift->lock); 1828 if (!(flags&IFA_F_TENTATIVE)) 1829 ipv6_ifa_notify(0, ift); 1830 } 1831 1832 if (create && in6_dev->cnf.use_tempaddr > 0) { 1833 /* 1834 * When a new public address is created as described in [ADDRCONF], 1835 * also create a new temporary address. 1836 */ 1837 read_unlock_bh(&in6_dev->lock); 1838 ipv6_create_tempaddr(ifp, NULL); 1839 } else { 1840 read_unlock_bh(&in6_dev->lock); 1841 } 1842 #endif 1843 in6_ifa_put(ifp); 1844 addrconf_verify(0); 1845 } 1846 } 1847 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1848 in6_dev_put(in6_dev); 1849 } 1850 1851 /* 1852 * Set destination address. 1853 * Special case for SIT interfaces where we create a new "virtual" 1854 * device. 1855 */ 1856 int addrconf_set_dstaddr(void __user *arg) 1857 { 1858 struct in6_ifreq ireq; 1859 struct net_device *dev; 1860 int err = -EINVAL; 1861 1862 rtnl_lock(); 1863 1864 err = -EFAULT; 1865 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1866 goto err_exit; 1867 1868 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex); 1869 1870 err = -ENODEV; 1871 if (dev == NULL) 1872 goto err_exit; 1873 1874 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1875 if (dev->type == ARPHRD_SIT) { 1876 struct ifreq ifr; 1877 mm_segment_t oldfs; 1878 struct ip_tunnel_parm p; 1879 1880 err = -EADDRNOTAVAIL; 1881 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1882 goto err_exit; 1883 1884 memset(&p, 0, sizeof(p)); 1885 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1886 p.iph.saddr = 0; 1887 p.iph.version = 4; 1888 p.iph.ihl = 5; 1889 p.iph.protocol = IPPROTO_IPV6; 1890 p.iph.ttl = 64; 1891 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1892 1893 oldfs = get_fs(); set_fs(KERNEL_DS); 1894 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1895 set_fs(oldfs); 1896 1897 if (err == 0) { 1898 err = -ENOBUFS; 1899 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL) 1900 goto err_exit; 1901 err = dev_open(dev); 1902 } 1903 } 1904 #endif 1905 1906 err_exit: 1907 rtnl_unlock(); 1908 return err; 1909 } 1910 1911 /* 1912 * Manual configuration of address on an interface 1913 */ 1914 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1915 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft) 1916 { 1917 struct inet6_ifaddr *ifp; 1918 struct inet6_dev *idev; 1919 struct net_device *dev; 1920 int scope; 1921 u32 flags = RTF_EXPIRES; 1922 1923 ASSERT_RTNL(); 1924 1925 /* check the lifetime */ 1926 if (!valid_lft || prefered_lft > valid_lft) 1927 return -EINVAL; 1928 1929 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL) 1930 return -ENODEV; 1931 1932 if ((idev = addrconf_add_dev(dev)) == NULL) 1933 return -ENOBUFS; 1934 1935 scope = ipv6_addr_scope(pfx); 1936 1937 if (valid_lft == INFINITY_LIFE_TIME) { 1938 ifa_flags |= IFA_F_PERMANENT; 1939 flags = 0; 1940 } else if (valid_lft >= 0x7FFFFFFF/HZ) 1941 valid_lft = 0x7FFFFFFF/HZ; 1942 1943 if (prefered_lft == 0) 1944 ifa_flags |= IFA_F_DEPRECATED; 1945 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1946 (prefered_lft != INFINITY_LIFE_TIME)) 1947 prefered_lft = 0x7FFFFFFF/HZ; 1948 1949 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1950 1951 if (!IS_ERR(ifp)) { 1952 spin_lock_bh(&ifp->lock); 1953 ifp->valid_lft = valid_lft; 1954 ifp->prefered_lft = prefered_lft; 1955 ifp->tstamp = jiffies; 1956 spin_unlock_bh(&ifp->lock); 1957 1958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 1959 jiffies_to_clock_t(valid_lft * HZ), flags); 1960 /* 1961 * Note that section 3.1 of RFC 4429 indicates 1962 * that the Optimistic flag should not be set for 1963 * manually configured addresses 1964 */ 1965 addrconf_dad_start(ifp, 0); 1966 in6_ifa_put(ifp); 1967 addrconf_verify(0); 1968 return 0; 1969 } 1970 1971 return PTR_ERR(ifp); 1972 } 1973 1974 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1975 { 1976 struct inet6_ifaddr *ifp; 1977 struct inet6_dev *idev; 1978 struct net_device *dev; 1979 1980 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL) 1981 return -ENODEV; 1982 1983 if ((idev = __in6_dev_get(dev)) == NULL) 1984 return -ENXIO; 1985 1986 read_lock_bh(&idev->lock); 1987 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1988 if (ifp->prefix_len == plen && 1989 ipv6_addr_equal(pfx, &ifp->addr)) { 1990 in6_ifa_hold(ifp); 1991 read_unlock_bh(&idev->lock); 1992 1993 ipv6_del_addr(ifp); 1994 1995 /* If the last address is deleted administratively, 1996 disable IPv6 on this interface. 1997 */ 1998 if (idev->addr_list == NULL) 1999 addrconf_ifdown(idev->dev, 1); 2000 return 0; 2001 } 2002 } 2003 read_unlock_bh(&idev->lock); 2004 return -EADDRNOTAVAIL; 2005 } 2006 2007 2008 int addrconf_add_ifaddr(void __user *arg) 2009 { 2010 struct in6_ifreq ireq; 2011 int err; 2012 2013 if (!capable(CAP_NET_ADMIN)) 2014 return -EPERM; 2015 2016 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2017 return -EFAULT; 2018 2019 rtnl_lock(); 2020 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 2021 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2022 rtnl_unlock(); 2023 return err; 2024 } 2025 2026 int addrconf_del_ifaddr(void __user *arg) 2027 { 2028 struct in6_ifreq ireq; 2029 int err; 2030 2031 if (!capable(CAP_NET_ADMIN)) 2032 return -EPERM; 2033 2034 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2035 return -EFAULT; 2036 2037 rtnl_lock(); 2038 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 2039 rtnl_unlock(); 2040 return err; 2041 } 2042 2043 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2044 static void sit_add_v4_addrs(struct inet6_dev *idev) 2045 { 2046 struct inet6_ifaddr * ifp; 2047 struct in6_addr addr; 2048 struct net_device *dev; 2049 int scope; 2050 2051 ASSERT_RTNL(); 2052 2053 memset(&addr, 0, sizeof(struct in6_addr)); 2054 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2055 2056 if (idev->dev->flags&IFF_POINTOPOINT) { 2057 addr.s6_addr32[0] = htonl(0xfe800000); 2058 scope = IFA_LINK; 2059 } else { 2060 scope = IPV6_ADDR_COMPATv4; 2061 } 2062 2063 if (addr.s6_addr32[3]) { 2064 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2065 if (!IS_ERR(ifp)) { 2066 spin_lock_bh(&ifp->lock); 2067 ifp->flags &= ~IFA_F_TENTATIVE; 2068 spin_unlock_bh(&ifp->lock); 2069 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2070 in6_ifa_put(ifp); 2071 } 2072 return; 2073 } 2074 2075 for_each_netdev(&init_net, dev) { 2076 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2077 if (in_dev && (dev->flags & IFF_UP)) { 2078 struct in_ifaddr * ifa; 2079 2080 int flag = scope; 2081 2082 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2083 int plen; 2084 2085 addr.s6_addr32[3] = ifa->ifa_local; 2086 2087 if (ifa->ifa_scope == RT_SCOPE_LINK) 2088 continue; 2089 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2090 if (idev->dev->flags&IFF_POINTOPOINT) 2091 continue; 2092 flag |= IFA_HOST; 2093 } 2094 if (idev->dev->flags&IFF_POINTOPOINT) 2095 plen = 64; 2096 else 2097 plen = 96; 2098 2099 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2100 IFA_F_PERMANENT); 2101 if (!IS_ERR(ifp)) { 2102 spin_lock_bh(&ifp->lock); 2103 ifp->flags &= ~IFA_F_TENTATIVE; 2104 spin_unlock_bh(&ifp->lock); 2105 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2106 in6_ifa_put(ifp); 2107 } 2108 } 2109 } 2110 } 2111 } 2112 #endif 2113 2114 static void init_loopback(struct net_device *dev) 2115 { 2116 struct inet6_dev *idev; 2117 struct inet6_ifaddr * ifp; 2118 2119 /* ::1 */ 2120 2121 ASSERT_RTNL(); 2122 2123 if ((idev = ipv6_find_idev(dev)) == NULL) { 2124 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2125 return; 2126 } 2127 2128 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2129 if (!IS_ERR(ifp)) { 2130 spin_lock_bh(&ifp->lock); 2131 ifp->flags &= ~IFA_F_TENTATIVE; 2132 spin_unlock_bh(&ifp->lock); 2133 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2134 in6_ifa_put(ifp); 2135 } 2136 } 2137 2138 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2139 { 2140 struct inet6_ifaddr * ifp; 2141 u32 addr_flags = IFA_F_PERMANENT; 2142 2143 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2144 if (idev->cnf.optimistic_dad && 2145 !ipv6_devconf.forwarding) 2146 addr_flags |= IFA_F_OPTIMISTIC; 2147 #endif 2148 2149 2150 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2151 if (!IS_ERR(ifp)) { 2152 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2153 addrconf_dad_start(ifp, 0); 2154 in6_ifa_put(ifp); 2155 } 2156 } 2157 2158 static void addrconf_dev_config(struct net_device *dev) 2159 { 2160 struct in6_addr addr; 2161 struct inet6_dev * idev; 2162 2163 ASSERT_RTNL(); 2164 2165 if ((dev->type != ARPHRD_ETHER) && 2166 (dev->type != ARPHRD_FDDI) && 2167 (dev->type != ARPHRD_IEEE802_TR) && 2168 (dev->type != ARPHRD_ARCNET) && 2169 (dev->type != ARPHRD_INFINIBAND)) { 2170 /* Alas, we support only Ethernet autoconfiguration. */ 2171 return; 2172 } 2173 2174 idev = addrconf_add_dev(dev); 2175 if (idev == NULL) 2176 return; 2177 2178 memset(&addr, 0, sizeof(struct in6_addr)); 2179 addr.s6_addr32[0] = htonl(0xFE800000); 2180 2181 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2182 addrconf_add_linklocal(idev, &addr); 2183 } 2184 2185 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2186 static void addrconf_sit_config(struct net_device *dev) 2187 { 2188 struct inet6_dev *idev; 2189 2190 ASSERT_RTNL(); 2191 2192 /* 2193 * Configure the tunnel with one of our IPv4 2194 * addresses... we should configure all of 2195 * our v4 addrs in the tunnel 2196 */ 2197 2198 if ((idev = ipv6_find_idev(dev)) == NULL) { 2199 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2200 return; 2201 } 2202 2203 sit_add_v4_addrs(idev); 2204 2205 if (dev->flags&IFF_POINTOPOINT) { 2206 addrconf_add_mroute(dev); 2207 addrconf_add_lroute(dev); 2208 } else 2209 sit_route_add(dev); 2210 } 2211 #endif 2212 2213 static inline int 2214 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2215 { 2216 struct in6_addr lladdr; 2217 2218 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2219 addrconf_add_linklocal(idev, &lladdr); 2220 return 0; 2221 } 2222 return -1; 2223 } 2224 2225 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2226 { 2227 struct net_device *link_dev; 2228 2229 /* first try to inherit the link-local address from the link device */ 2230 if (idev->dev->iflink && 2231 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) { 2232 if (!ipv6_inherit_linklocal(idev, link_dev)) 2233 return; 2234 } 2235 /* then try to inherit it from any device */ 2236 for_each_netdev(&init_net, link_dev) { 2237 if (!ipv6_inherit_linklocal(idev, link_dev)) 2238 return; 2239 } 2240 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2241 } 2242 2243 /* 2244 * Autoconfigure tunnel with a link-local address so routing protocols, 2245 * DHCPv6, MLD etc. can be run over the virtual link 2246 */ 2247 2248 static void addrconf_ip6_tnl_config(struct net_device *dev) 2249 { 2250 struct inet6_dev *idev; 2251 2252 ASSERT_RTNL(); 2253 2254 if ((idev = addrconf_add_dev(dev)) == NULL) { 2255 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2256 return; 2257 } 2258 ip6_tnl_add_linklocal(idev); 2259 } 2260 2261 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2262 void * data) 2263 { 2264 struct net_device *dev = (struct net_device *) data; 2265 struct inet6_dev *idev = __in6_dev_get(dev); 2266 int run_pending = 0; 2267 int err; 2268 2269 if (dev->nd_net != &init_net) 2270 return NOTIFY_DONE; 2271 2272 switch(event) { 2273 case NETDEV_REGISTER: 2274 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2275 idev = ipv6_add_dev(dev); 2276 if (!idev) 2277 return notifier_from_errno(-ENOMEM); 2278 } 2279 break; 2280 case NETDEV_UP: 2281 case NETDEV_CHANGE: 2282 if (dev->flags & IFF_SLAVE) 2283 break; 2284 2285 if (event == NETDEV_UP) { 2286 if (!netif_carrier_ok(dev)) { 2287 /* device is not ready yet. */ 2288 printk(KERN_INFO 2289 "ADDRCONF(NETDEV_UP): %s: " 2290 "link is not ready\n", 2291 dev->name); 2292 break; 2293 } 2294 2295 if (idev) 2296 idev->if_flags |= IF_READY; 2297 } else { 2298 if (!netif_carrier_ok(dev)) { 2299 /* device is still not ready. */ 2300 break; 2301 } 2302 2303 if (idev) { 2304 if (idev->if_flags & IF_READY) { 2305 /* device is already configured. */ 2306 break; 2307 } 2308 idev->if_flags |= IF_READY; 2309 } 2310 2311 printk(KERN_INFO 2312 "ADDRCONF(NETDEV_CHANGE): %s: " 2313 "link becomes ready\n", 2314 dev->name); 2315 2316 run_pending = 1; 2317 } 2318 2319 switch(dev->type) { 2320 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2321 case ARPHRD_SIT: 2322 addrconf_sit_config(dev); 2323 break; 2324 #endif 2325 case ARPHRD_TUNNEL6: 2326 addrconf_ip6_tnl_config(dev); 2327 break; 2328 case ARPHRD_LOOPBACK: 2329 init_loopback(dev); 2330 break; 2331 2332 default: 2333 addrconf_dev_config(dev); 2334 break; 2335 } 2336 if (idev) { 2337 if (run_pending) 2338 addrconf_dad_run(idev); 2339 2340 /* If the MTU changed during the interface down, when the 2341 interface up, the changed MTU must be reflected in the 2342 idev as well as routers. 2343 */ 2344 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2345 rt6_mtu_change(dev, dev->mtu); 2346 idev->cnf.mtu6 = dev->mtu; 2347 } 2348 idev->tstamp = jiffies; 2349 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2350 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2351 stop IPv6 on this interface. 2352 */ 2353 if (dev->mtu < IPV6_MIN_MTU) 2354 addrconf_ifdown(dev, event != NETDEV_DOWN); 2355 } 2356 break; 2357 2358 case NETDEV_CHANGEMTU: 2359 if ( idev && dev->mtu >= IPV6_MIN_MTU) { 2360 rt6_mtu_change(dev, dev->mtu); 2361 idev->cnf.mtu6 = dev->mtu; 2362 break; 2363 } 2364 2365 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2366 2367 case NETDEV_DOWN: 2368 case NETDEV_UNREGISTER: 2369 /* 2370 * Remove all addresses from this interface. 2371 */ 2372 addrconf_ifdown(dev, event != NETDEV_DOWN); 2373 break; 2374 2375 case NETDEV_CHANGENAME: 2376 if (idev) { 2377 snmp6_unregister_dev(idev); 2378 #ifdef CONFIG_SYSCTL 2379 addrconf_sysctl_unregister(&idev->cnf); 2380 neigh_sysctl_unregister(idev->nd_parms); 2381 neigh_sysctl_register(dev, idev->nd_parms, 2382 NET_IPV6, NET_IPV6_NEIGH, "ipv6", 2383 &ndisc_ifinfo_sysctl_change, 2384 NULL); 2385 addrconf_sysctl_register(idev, &idev->cnf); 2386 #endif 2387 err = snmp6_register_dev(idev); 2388 if (err) 2389 return notifier_from_errno(err); 2390 } 2391 break; 2392 } 2393 2394 return NOTIFY_OK; 2395 } 2396 2397 /* 2398 * addrconf module should be notified of a device going up 2399 */ 2400 static struct notifier_block ipv6_dev_notf = { 2401 .notifier_call = addrconf_notify, 2402 .priority = 0 2403 }; 2404 2405 static int addrconf_ifdown(struct net_device *dev, int how) 2406 { 2407 struct inet6_dev *idev; 2408 struct inet6_ifaddr *ifa, **bifa; 2409 int i; 2410 2411 ASSERT_RTNL(); 2412 2413 if (dev == loopback_dev && how == 1) 2414 how = 0; 2415 2416 rt6_ifdown(dev); 2417 neigh_ifdown(&nd_tbl, dev); 2418 2419 idev = __in6_dev_get(dev); 2420 if (idev == NULL) 2421 return -ENODEV; 2422 2423 /* Step 1: remove reference to ipv6 device from parent device. 2424 Do not dev_put! 2425 */ 2426 if (how == 1) { 2427 idev->dead = 1; 2428 2429 /* protected by rtnl_lock */ 2430 rcu_assign_pointer(dev->ip6_ptr, NULL); 2431 2432 /* Step 1.5: remove snmp6 entry */ 2433 snmp6_unregister_dev(idev); 2434 2435 } 2436 2437 /* Step 2: clear hash table */ 2438 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2439 bifa = &inet6_addr_lst[i]; 2440 2441 write_lock_bh(&addrconf_hash_lock); 2442 while ((ifa = *bifa) != NULL) { 2443 if (ifa->idev == idev) { 2444 *bifa = ifa->lst_next; 2445 ifa->lst_next = NULL; 2446 addrconf_del_timer(ifa); 2447 in6_ifa_put(ifa); 2448 continue; 2449 } 2450 bifa = &ifa->lst_next; 2451 } 2452 write_unlock_bh(&addrconf_hash_lock); 2453 } 2454 2455 write_lock_bh(&idev->lock); 2456 2457 /* Step 3: clear flags for stateless addrconf */ 2458 if (how != 1) 2459 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2460 2461 /* Step 4: clear address list */ 2462 #ifdef CONFIG_IPV6_PRIVACY 2463 if (how == 1 && del_timer(&idev->regen_timer)) 2464 in6_dev_put(idev); 2465 2466 /* clear tempaddr list */ 2467 while ((ifa = idev->tempaddr_list) != NULL) { 2468 idev->tempaddr_list = ifa->tmp_next; 2469 ifa->tmp_next = NULL; 2470 ifa->dead = 1; 2471 write_unlock_bh(&idev->lock); 2472 spin_lock_bh(&ifa->lock); 2473 2474 if (ifa->ifpub) { 2475 in6_ifa_put(ifa->ifpub); 2476 ifa->ifpub = NULL; 2477 } 2478 spin_unlock_bh(&ifa->lock); 2479 in6_ifa_put(ifa); 2480 write_lock_bh(&idev->lock); 2481 } 2482 #endif 2483 while ((ifa = idev->addr_list) != NULL) { 2484 idev->addr_list = ifa->if_next; 2485 ifa->if_next = NULL; 2486 ifa->dead = 1; 2487 addrconf_del_timer(ifa); 2488 write_unlock_bh(&idev->lock); 2489 2490 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2491 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2492 in6_ifa_put(ifa); 2493 2494 write_lock_bh(&idev->lock); 2495 } 2496 write_unlock_bh(&idev->lock); 2497 2498 /* Step 5: Discard multicast list */ 2499 2500 if (how == 1) 2501 ipv6_mc_destroy_dev(idev); 2502 else 2503 ipv6_mc_down(idev); 2504 2505 idev->tstamp = jiffies; 2506 2507 /* Shot the device (if unregistered) */ 2508 2509 if (how == 1) { 2510 #ifdef CONFIG_SYSCTL 2511 addrconf_sysctl_unregister(&idev->cnf); 2512 neigh_sysctl_unregister(idev->nd_parms); 2513 #endif 2514 neigh_parms_release(&nd_tbl, idev->nd_parms); 2515 neigh_ifdown(&nd_tbl, dev); 2516 in6_dev_put(idev); 2517 } 2518 return 0; 2519 } 2520 2521 static void addrconf_rs_timer(unsigned long data) 2522 { 2523 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2524 2525 if (ifp->idev->cnf.forwarding) 2526 goto out; 2527 2528 if (ifp->idev->if_flags & IF_RA_RCVD) { 2529 /* 2530 * Announcement received after solicitation 2531 * was sent 2532 */ 2533 goto out; 2534 } 2535 2536 spin_lock(&ifp->lock); 2537 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2538 struct in6_addr all_routers; 2539 2540 /* The wait after the last probe can be shorter */ 2541 addrconf_mod_timer(ifp, AC_RS, 2542 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2543 ifp->idev->cnf.rtr_solicit_delay : 2544 ifp->idev->cnf.rtr_solicit_interval); 2545 spin_unlock(&ifp->lock); 2546 2547 ipv6_addr_all_routers(&all_routers); 2548 2549 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2550 } else { 2551 spin_unlock(&ifp->lock); 2552 /* 2553 * Note: we do not support deprecated "all on-link" 2554 * assumption any longer. 2555 */ 2556 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2557 ifp->idev->dev->name); 2558 } 2559 2560 out: 2561 in6_ifa_put(ifp); 2562 } 2563 2564 /* 2565 * Duplicate Address Detection 2566 */ 2567 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2568 { 2569 unsigned long rand_num; 2570 struct inet6_dev *idev = ifp->idev; 2571 2572 if (ifp->flags & IFA_F_OPTIMISTIC) 2573 rand_num = 0; 2574 else 2575 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2576 2577 ifp->probes = idev->cnf.dad_transmits; 2578 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2579 } 2580 2581 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2582 { 2583 struct inet6_dev *idev = ifp->idev; 2584 struct net_device *dev = idev->dev; 2585 2586 addrconf_join_solict(dev, &ifp->addr); 2587 2588 net_srandom(ifp->addr.s6_addr32[3]); 2589 2590 read_lock_bh(&idev->lock); 2591 if (ifp->dead) 2592 goto out; 2593 spin_lock_bh(&ifp->lock); 2594 2595 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2596 !(ifp->flags&IFA_F_TENTATIVE) || 2597 ifp->flags & IFA_F_NODAD) { 2598 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2599 spin_unlock_bh(&ifp->lock); 2600 read_unlock_bh(&idev->lock); 2601 2602 addrconf_dad_completed(ifp); 2603 return; 2604 } 2605 2606 if (!(idev->if_flags & IF_READY)) { 2607 spin_unlock_bh(&ifp->lock); 2608 read_unlock_bh(&idev->lock); 2609 /* 2610 * If the defice is not ready: 2611 * - keep it tentative if it is a permanent address. 2612 * - otherwise, kill it. 2613 */ 2614 in6_ifa_hold(ifp); 2615 addrconf_dad_stop(ifp); 2616 return; 2617 } 2618 2619 /* 2620 * Optimistic nodes can start receiving 2621 * Frames right away 2622 */ 2623 if(ifp->flags & IFA_F_OPTIMISTIC) 2624 ip6_ins_rt(ifp->rt); 2625 2626 addrconf_dad_kick(ifp); 2627 spin_unlock_bh(&ifp->lock); 2628 out: 2629 read_unlock_bh(&idev->lock); 2630 } 2631 2632 static void addrconf_dad_timer(unsigned long data) 2633 { 2634 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2635 struct inet6_dev *idev = ifp->idev; 2636 struct in6_addr unspec; 2637 struct in6_addr mcaddr; 2638 2639 read_lock_bh(&idev->lock); 2640 if (idev->dead) { 2641 read_unlock_bh(&idev->lock); 2642 goto out; 2643 } 2644 spin_lock_bh(&ifp->lock); 2645 if (ifp->probes == 0) { 2646 /* 2647 * DAD was successful 2648 */ 2649 2650 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2651 spin_unlock_bh(&ifp->lock); 2652 read_unlock_bh(&idev->lock); 2653 2654 addrconf_dad_completed(ifp); 2655 2656 goto out; 2657 } 2658 2659 ifp->probes--; 2660 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2661 spin_unlock_bh(&ifp->lock); 2662 read_unlock_bh(&idev->lock); 2663 2664 /* send a neighbour solicitation for our addr */ 2665 memset(&unspec, 0, sizeof(unspec)); 2666 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2667 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2668 out: 2669 in6_ifa_put(ifp); 2670 } 2671 2672 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2673 { 2674 struct net_device * dev = ifp->idev->dev; 2675 2676 /* 2677 * Configure the address for reception. Now it is valid. 2678 */ 2679 2680 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2681 2682 /* If added prefix is link local and forwarding is off, 2683 start sending router solicitations. 2684 */ 2685 2686 if (ifp->idev->cnf.forwarding == 0 && 2687 ifp->idev->cnf.rtr_solicits > 0 && 2688 (dev->flags&IFF_LOOPBACK) == 0 && 2689 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2690 struct in6_addr all_routers; 2691 2692 ipv6_addr_all_routers(&all_routers); 2693 2694 /* 2695 * If a host as already performed a random delay 2696 * [...] as part of DAD [...] there is no need 2697 * to delay again before sending the first RS 2698 */ 2699 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2700 2701 spin_lock_bh(&ifp->lock); 2702 ifp->probes = 1; 2703 ifp->idev->if_flags |= IF_RS_SENT; 2704 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2705 spin_unlock_bh(&ifp->lock); 2706 } 2707 } 2708 2709 static void addrconf_dad_run(struct inet6_dev *idev) { 2710 struct inet6_ifaddr *ifp; 2711 2712 read_lock_bh(&idev->lock); 2713 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2714 spin_lock_bh(&ifp->lock); 2715 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2716 spin_unlock_bh(&ifp->lock); 2717 continue; 2718 } 2719 spin_unlock_bh(&ifp->lock); 2720 addrconf_dad_kick(ifp); 2721 } 2722 read_unlock_bh(&idev->lock); 2723 } 2724 2725 #ifdef CONFIG_PROC_FS 2726 struct if6_iter_state { 2727 int bucket; 2728 }; 2729 2730 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2731 { 2732 struct inet6_ifaddr *ifa = NULL; 2733 struct if6_iter_state *state = seq->private; 2734 2735 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2736 ifa = inet6_addr_lst[state->bucket]; 2737 if (ifa) 2738 break; 2739 } 2740 return ifa; 2741 } 2742 2743 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2744 { 2745 struct if6_iter_state *state = seq->private; 2746 2747 ifa = ifa->lst_next; 2748 try_again: 2749 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2750 ifa = inet6_addr_lst[state->bucket]; 2751 goto try_again; 2752 } 2753 return ifa; 2754 } 2755 2756 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2757 { 2758 struct inet6_ifaddr *ifa = if6_get_first(seq); 2759 2760 if (ifa) 2761 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2762 --pos; 2763 return pos ? NULL : ifa; 2764 } 2765 2766 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2767 { 2768 read_lock_bh(&addrconf_hash_lock); 2769 return if6_get_idx(seq, *pos); 2770 } 2771 2772 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2773 { 2774 struct inet6_ifaddr *ifa; 2775 2776 ifa = if6_get_next(seq, v); 2777 ++*pos; 2778 return ifa; 2779 } 2780 2781 static void if6_seq_stop(struct seq_file *seq, void *v) 2782 { 2783 read_unlock_bh(&addrconf_hash_lock); 2784 } 2785 2786 static int if6_seq_show(struct seq_file *seq, void *v) 2787 { 2788 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2789 seq_printf(seq, 2790 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2791 NIP6(ifp->addr), 2792 ifp->idev->dev->ifindex, 2793 ifp->prefix_len, 2794 ifp->scope, 2795 ifp->flags, 2796 ifp->idev->dev->name); 2797 return 0; 2798 } 2799 2800 static const struct seq_operations if6_seq_ops = { 2801 .start = if6_seq_start, 2802 .next = if6_seq_next, 2803 .show = if6_seq_show, 2804 .stop = if6_seq_stop, 2805 }; 2806 2807 static int if6_seq_open(struct inode *inode, struct file *file) 2808 { 2809 struct seq_file *seq; 2810 int rc = -ENOMEM; 2811 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2812 2813 if (!s) 2814 goto out; 2815 2816 rc = seq_open(file, &if6_seq_ops); 2817 if (rc) 2818 goto out_kfree; 2819 2820 seq = file->private_data; 2821 seq->private = s; 2822 out: 2823 return rc; 2824 out_kfree: 2825 kfree(s); 2826 goto out; 2827 } 2828 2829 static const struct file_operations if6_fops = { 2830 .owner = THIS_MODULE, 2831 .open = if6_seq_open, 2832 .read = seq_read, 2833 .llseek = seq_lseek, 2834 .release = seq_release_private, 2835 }; 2836 2837 int __init if6_proc_init(void) 2838 { 2839 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops)) 2840 return -ENOMEM; 2841 return 0; 2842 } 2843 2844 void if6_proc_exit(void) 2845 { 2846 proc_net_remove(&init_net, "if_inet6"); 2847 } 2848 #endif /* CONFIG_PROC_FS */ 2849 2850 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 2851 /* Check if address is a home address configured on any interface. */ 2852 int ipv6_chk_home_addr(struct in6_addr *addr) 2853 { 2854 int ret = 0; 2855 struct inet6_ifaddr * ifp; 2856 u8 hash = ipv6_addr_hash(addr); 2857 read_lock_bh(&addrconf_hash_lock); 2858 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2859 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 && 2860 (ifp->flags & IFA_F_HOMEADDRESS)) { 2861 ret = 1; 2862 break; 2863 } 2864 } 2865 read_unlock_bh(&addrconf_hash_lock); 2866 return ret; 2867 } 2868 #endif 2869 2870 /* 2871 * Periodic address status verification 2872 */ 2873 2874 static void addrconf_verify(unsigned long foo) 2875 { 2876 struct inet6_ifaddr *ifp; 2877 unsigned long now, next; 2878 int i; 2879 2880 spin_lock_bh(&addrconf_verify_lock); 2881 now = jiffies; 2882 next = now + ADDR_CHECK_FREQUENCY; 2883 2884 del_timer(&addr_chk_timer); 2885 2886 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2887 2888 restart: 2889 read_lock(&addrconf_hash_lock); 2890 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2891 unsigned long age; 2892 #ifdef CONFIG_IPV6_PRIVACY 2893 unsigned long regen_advance; 2894 #endif 2895 2896 if (ifp->flags & IFA_F_PERMANENT) 2897 continue; 2898 2899 spin_lock(&ifp->lock); 2900 age = (now - ifp->tstamp) / HZ; 2901 2902 #ifdef CONFIG_IPV6_PRIVACY 2903 regen_advance = ifp->idev->cnf.regen_max_retry * 2904 ifp->idev->cnf.dad_transmits * 2905 ifp->idev->nd_parms->retrans_time / HZ; 2906 #endif 2907 2908 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2909 age >= ifp->valid_lft) { 2910 spin_unlock(&ifp->lock); 2911 in6_ifa_hold(ifp); 2912 read_unlock(&addrconf_hash_lock); 2913 ipv6_del_addr(ifp); 2914 goto restart; 2915 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2916 spin_unlock(&ifp->lock); 2917 continue; 2918 } else if (age >= ifp->prefered_lft) { 2919 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2920 int deprecate = 0; 2921 2922 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2923 deprecate = 1; 2924 ifp->flags |= IFA_F_DEPRECATED; 2925 } 2926 2927 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2928 next = ifp->tstamp + ifp->valid_lft * HZ; 2929 2930 spin_unlock(&ifp->lock); 2931 2932 if (deprecate) { 2933 in6_ifa_hold(ifp); 2934 read_unlock(&addrconf_hash_lock); 2935 2936 ipv6_ifa_notify(0, ifp); 2937 in6_ifa_put(ifp); 2938 goto restart; 2939 } 2940 #ifdef CONFIG_IPV6_PRIVACY 2941 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2942 !(ifp->flags&IFA_F_TENTATIVE)) { 2943 if (age >= ifp->prefered_lft - regen_advance) { 2944 struct inet6_ifaddr *ifpub = ifp->ifpub; 2945 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2946 next = ifp->tstamp + ifp->prefered_lft * HZ; 2947 if (!ifp->regen_count && ifpub) { 2948 ifp->regen_count++; 2949 in6_ifa_hold(ifp); 2950 in6_ifa_hold(ifpub); 2951 spin_unlock(&ifp->lock); 2952 read_unlock(&addrconf_hash_lock); 2953 spin_lock(&ifpub->lock); 2954 ifpub->regen_count = 0; 2955 spin_unlock(&ifpub->lock); 2956 ipv6_create_tempaddr(ifpub, ifp); 2957 in6_ifa_put(ifpub); 2958 in6_ifa_put(ifp); 2959 goto restart; 2960 } 2961 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2962 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2963 spin_unlock(&ifp->lock); 2964 #endif 2965 } else { 2966 /* ifp->prefered_lft <= ifp->valid_lft */ 2967 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2968 next = ifp->tstamp + ifp->prefered_lft * HZ; 2969 spin_unlock(&ifp->lock); 2970 } 2971 } 2972 read_unlock(&addrconf_hash_lock); 2973 } 2974 2975 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2976 add_timer(&addr_chk_timer); 2977 spin_unlock_bh(&addrconf_verify_lock); 2978 } 2979 2980 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 2981 { 2982 struct in6_addr *pfx = NULL; 2983 2984 if (addr) 2985 pfx = nla_data(addr); 2986 2987 if (local) { 2988 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 2989 pfx = NULL; 2990 else 2991 pfx = nla_data(local); 2992 } 2993 2994 return pfx; 2995 } 2996 2997 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 2998 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 2999 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3000 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3001 }; 3002 3003 static int 3004 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3005 { 3006 struct ifaddrmsg *ifm; 3007 struct nlattr *tb[IFA_MAX+1]; 3008 struct in6_addr *pfx; 3009 int err; 3010 3011 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3012 if (err < 0) 3013 return err; 3014 3015 ifm = nlmsg_data(nlh); 3016 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3017 if (pfx == NULL) 3018 return -EINVAL; 3019 3020 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3021 } 3022 3023 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3024 u32 prefered_lft, u32 valid_lft) 3025 { 3026 u32 flags = RTF_EXPIRES; 3027 3028 if (!valid_lft || (prefered_lft > valid_lft)) 3029 return -EINVAL; 3030 3031 if (valid_lft == INFINITY_LIFE_TIME) { 3032 ifa_flags |= IFA_F_PERMANENT; 3033 flags = 0; 3034 } else if (valid_lft >= 0x7FFFFFFF/HZ) 3035 valid_lft = 0x7FFFFFFF/HZ; 3036 3037 if (prefered_lft == 0) 3038 ifa_flags |= IFA_F_DEPRECATED; 3039 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 3040 (prefered_lft != INFINITY_LIFE_TIME)) 3041 prefered_lft = 0x7FFFFFFF/HZ; 3042 3043 spin_lock_bh(&ifp->lock); 3044 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3045 ifp->tstamp = jiffies; 3046 ifp->valid_lft = valid_lft; 3047 ifp->prefered_lft = prefered_lft; 3048 3049 spin_unlock_bh(&ifp->lock); 3050 if (!(ifp->flags&IFA_F_TENTATIVE)) 3051 ipv6_ifa_notify(0, ifp); 3052 3053 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3054 jiffies_to_clock_t(valid_lft * HZ), flags); 3055 addrconf_verify(0); 3056 3057 return 0; 3058 } 3059 3060 static int 3061 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3062 { 3063 struct ifaddrmsg *ifm; 3064 struct nlattr *tb[IFA_MAX+1]; 3065 struct in6_addr *pfx; 3066 struct inet6_ifaddr *ifa; 3067 struct net_device *dev; 3068 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3069 u8 ifa_flags; 3070 int err; 3071 3072 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3073 if (err < 0) 3074 return err; 3075 3076 ifm = nlmsg_data(nlh); 3077 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3078 if (pfx == NULL) 3079 return -EINVAL; 3080 3081 if (tb[IFA_CACHEINFO]) { 3082 struct ifa_cacheinfo *ci; 3083 3084 ci = nla_data(tb[IFA_CACHEINFO]); 3085 valid_lft = ci->ifa_valid; 3086 preferred_lft = ci->ifa_prefered; 3087 } else { 3088 preferred_lft = INFINITY_LIFE_TIME; 3089 valid_lft = INFINITY_LIFE_TIME; 3090 } 3091 3092 dev = __dev_get_by_index(&init_net, ifm->ifa_index); 3093 if (dev == NULL) 3094 return -ENODEV; 3095 3096 /* We ignore other flags so far. */ 3097 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3098 3099 ifa = ipv6_get_ifaddr(pfx, dev, 1); 3100 if (ifa == NULL) { 3101 /* 3102 * It would be best to check for !NLM_F_CREATE here but 3103 * userspace alreay relies on not having to provide this. 3104 */ 3105 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 3106 ifa_flags, preferred_lft, valid_lft); 3107 } 3108 3109 if (nlh->nlmsg_flags & NLM_F_EXCL || 3110 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3111 err = -EEXIST; 3112 else 3113 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3114 3115 in6_ifa_put(ifa); 3116 3117 return err; 3118 } 3119 3120 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3121 u8 scope, int ifindex) 3122 { 3123 struct ifaddrmsg *ifm; 3124 3125 ifm = nlmsg_data(nlh); 3126 ifm->ifa_family = AF_INET6; 3127 ifm->ifa_prefixlen = prefixlen; 3128 ifm->ifa_flags = flags; 3129 ifm->ifa_scope = scope; 3130 ifm->ifa_index = ifindex; 3131 } 3132 3133 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3134 unsigned long tstamp, u32 preferred, u32 valid) 3135 { 3136 struct ifa_cacheinfo ci; 3137 3138 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3139 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3140 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3141 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3142 ci.ifa_prefered = preferred; 3143 ci.ifa_valid = valid; 3144 3145 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3146 } 3147 3148 static inline int rt_scope(int ifa_scope) 3149 { 3150 if (ifa_scope & IFA_HOST) 3151 return RT_SCOPE_HOST; 3152 else if (ifa_scope & IFA_LINK) 3153 return RT_SCOPE_LINK; 3154 else if (ifa_scope & IFA_SITE) 3155 return RT_SCOPE_SITE; 3156 else 3157 return RT_SCOPE_UNIVERSE; 3158 } 3159 3160 static inline int inet6_ifaddr_msgsize(void) 3161 { 3162 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3163 + nla_total_size(16) /* IFA_ADDRESS */ 3164 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3165 } 3166 3167 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3168 u32 pid, u32 seq, int event, unsigned int flags) 3169 { 3170 struct nlmsghdr *nlh; 3171 u32 preferred, valid; 3172 3173 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3174 if (nlh == NULL) 3175 return -EMSGSIZE; 3176 3177 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3178 ifa->idev->dev->ifindex); 3179 3180 if (!(ifa->flags&IFA_F_PERMANENT)) { 3181 preferred = ifa->prefered_lft; 3182 valid = ifa->valid_lft; 3183 if (preferred != INFINITY_LIFE_TIME) { 3184 long tval = (jiffies - ifa->tstamp)/HZ; 3185 preferred -= tval; 3186 if (valid != INFINITY_LIFE_TIME) 3187 valid -= tval; 3188 } 3189 } else { 3190 preferred = INFINITY_LIFE_TIME; 3191 valid = INFINITY_LIFE_TIME; 3192 } 3193 3194 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3195 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3196 nlmsg_cancel(skb, nlh); 3197 return -EMSGSIZE; 3198 } 3199 3200 return nlmsg_end(skb, nlh); 3201 } 3202 3203 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3204 u32 pid, u32 seq, int event, u16 flags) 3205 { 3206 struct nlmsghdr *nlh; 3207 u8 scope = RT_SCOPE_UNIVERSE; 3208 int ifindex = ifmca->idev->dev->ifindex; 3209 3210 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3211 scope = RT_SCOPE_SITE; 3212 3213 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3214 if (nlh == NULL) 3215 return -EMSGSIZE; 3216 3217 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3218 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3219 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3220 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3221 nlmsg_cancel(skb, nlh); 3222 return -EMSGSIZE; 3223 } 3224 3225 return nlmsg_end(skb, nlh); 3226 } 3227 3228 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3229 u32 pid, u32 seq, int event, unsigned int flags) 3230 { 3231 struct nlmsghdr *nlh; 3232 u8 scope = RT_SCOPE_UNIVERSE; 3233 int ifindex = ifaca->aca_idev->dev->ifindex; 3234 3235 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3236 scope = RT_SCOPE_SITE; 3237 3238 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3239 if (nlh == NULL) 3240 return -EMSGSIZE; 3241 3242 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3243 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3244 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3245 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3246 nlmsg_cancel(skb, nlh); 3247 return -EMSGSIZE; 3248 } 3249 3250 return nlmsg_end(skb, nlh); 3251 } 3252 3253 enum addr_type_t 3254 { 3255 UNICAST_ADDR, 3256 MULTICAST_ADDR, 3257 ANYCAST_ADDR, 3258 }; 3259 3260 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3261 enum addr_type_t type) 3262 { 3263 int idx, ip_idx; 3264 int s_idx, s_ip_idx; 3265 int err = 1; 3266 struct net_device *dev; 3267 struct inet6_dev *idev = NULL; 3268 struct inet6_ifaddr *ifa; 3269 struct ifmcaddr6 *ifmca; 3270 struct ifacaddr6 *ifaca; 3271 3272 s_idx = cb->args[0]; 3273 s_ip_idx = ip_idx = cb->args[1]; 3274 3275 idx = 0; 3276 for_each_netdev(&init_net, dev) { 3277 if (idx < s_idx) 3278 goto cont; 3279 if (idx > s_idx) 3280 s_ip_idx = 0; 3281 ip_idx = 0; 3282 if ((idev = in6_dev_get(dev)) == NULL) 3283 goto cont; 3284 read_lock_bh(&idev->lock); 3285 switch (type) { 3286 case UNICAST_ADDR: 3287 /* unicast address incl. temp addr */ 3288 for (ifa = idev->addr_list; ifa; 3289 ifa = ifa->if_next, ip_idx++) { 3290 if (ip_idx < s_ip_idx) 3291 continue; 3292 if ((err = inet6_fill_ifaddr(skb, ifa, 3293 NETLINK_CB(cb->skb).pid, 3294 cb->nlh->nlmsg_seq, RTM_NEWADDR, 3295 NLM_F_MULTI)) <= 0) 3296 goto done; 3297 } 3298 break; 3299 case MULTICAST_ADDR: 3300 /* multicast address */ 3301 for (ifmca = idev->mc_list; ifmca; 3302 ifmca = ifmca->next, ip_idx++) { 3303 if (ip_idx < s_ip_idx) 3304 continue; 3305 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 3306 NETLINK_CB(cb->skb).pid, 3307 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 3308 NLM_F_MULTI)) <= 0) 3309 goto done; 3310 } 3311 break; 3312 case ANYCAST_ADDR: 3313 /* anycast address */ 3314 for (ifaca = idev->ac_list; ifaca; 3315 ifaca = ifaca->aca_next, ip_idx++) { 3316 if (ip_idx < s_ip_idx) 3317 continue; 3318 if ((err = inet6_fill_ifacaddr(skb, ifaca, 3319 NETLINK_CB(cb->skb).pid, 3320 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 3321 NLM_F_MULTI)) <= 0) 3322 goto done; 3323 } 3324 break; 3325 default: 3326 break; 3327 } 3328 read_unlock_bh(&idev->lock); 3329 in6_dev_put(idev); 3330 cont: 3331 idx++; 3332 } 3333 done: 3334 if (err <= 0) { 3335 read_unlock_bh(&idev->lock); 3336 in6_dev_put(idev); 3337 } 3338 cb->args[0] = idx; 3339 cb->args[1] = ip_idx; 3340 return skb->len; 3341 } 3342 3343 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3344 { 3345 enum addr_type_t type = UNICAST_ADDR; 3346 return inet6_dump_addr(skb, cb, type); 3347 } 3348 3349 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3350 { 3351 enum addr_type_t type = MULTICAST_ADDR; 3352 return inet6_dump_addr(skb, cb, type); 3353 } 3354 3355 3356 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3357 { 3358 enum addr_type_t type = ANYCAST_ADDR; 3359 return inet6_dump_addr(skb, cb, type); 3360 } 3361 3362 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3363 void *arg) 3364 { 3365 struct ifaddrmsg *ifm; 3366 struct nlattr *tb[IFA_MAX+1]; 3367 struct in6_addr *addr = NULL; 3368 struct net_device *dev = NULL; 3369 struct inet6_ifaddr *ifa; 3370 struct sk_buff *skb; 3371 int err; 3372 3373 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3374 if (err < 0) 3375 goto errout; 3376 3377 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3378 if (addr == NULL) { 3379 err = -EINVAL; 3380 goto errout; 3381 } 3382 3383 ifm = nlmsg_data(nlh); 3384 if (ifm->ifa_index) 3385 dev = __dev_get_by_index(&init_net, ifm->ifa_index); 3386 3387 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) { 3388 err = -EADDRNOTAVAIL; 3389 goto errout; 3390 } 3391 3392 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3393 err = -ENOBUFS; 3394 goto errout_ifa; 3395 } 3396 3397 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3398 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3399 if (err < 0) { 3400 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3401 WARN_ON(err == -EMSGSIZE); 3402 kfree_skb(skb); 3403 goto errout_ifa; 3404 } 3405 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); 3406 errout_ifa: 3407 in6_ifa_put(ifa); 3408 errout: 3409 return err; 3410 } 3411 3412 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3413 { 3414 struct sk_buff *skb; 3415 int err = -ENOBUFS; 3416 3417 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3418 if (skb == NULL) 3419 goto errout; 3420 3421 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3422 if (err < 0) { 3423 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3424 WARN_ON(err == -EMSGSIZE); 3425 kfree_skb(skb); 3426 goto errout; 3427 } 3428 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3429 errout: 3430 if (err < 0) 3431 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3432 } 3433 3434 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3435 __s32 *array, int bytes) 3436 { 3437 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3438 3439 memset(array, 0, bytes); 3440 array[DEVCONF_FORWARDING] = cnf->forwarding; 3441 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3442 array[DEVCONF_MTU6] = cnf->mtu6; 3443 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3444 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3445 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3446 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3447 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3448 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3449 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3450 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3451 #ifdef CONFIG_IPV6_PRIVACY 3452 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3453 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3454 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3455 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3456 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3457 #endif 3458 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3459 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3460 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3461 #ifdef CONFIG_IPV6_ROUTER_PREF 3462 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3463 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3464 #ifdef CONFIG_IPV6_ROUTE_INFO 3465 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3466 #endif 3467 #endif 3468 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3469 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3470 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3471 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3472 #endif 3473 } 3474 3475 static inline size_t inet6_if_nlmsg_size(void) 3476 { 3477 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3478 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3479 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3480 + nla_total_size(4) /* IFLA_MTU */ 3481 + nla_total_size(4) /* IFLA_LINK */ 3482 + nla_total_size( /* IFLA_PROTINFO */ 3483 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3484 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3485 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3486 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3487 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3488 ); 3489 } 3490 3491 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3492 int bytes) 3493 { 3494 int i; 3495 int pad = bytes - sizeof(u64) * items; 3496 BUG_ON(pad < 0); 3497 3498 /* Use put_unaligned() because stats may not be aligned for u64. */ 3499 put_unaligned(items, &stats[0]); 3500 for (i = 1; i < items; i++) 3501 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3502 3503 memset(&stats[items], 0, pad); 3504 } 3505 3506 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3507 int bytes) 3508 { 3509 switch(attrtype) { 3510 case IFLA_INET6_STATS: 3511 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3512 break; 3513 case IFLA_INET6_ICMP6STATS: 3514 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3515 break; 3516 } 3517 } 3518 3519 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3520 u32 pid, u32 seq, int event, unsigned int flags) 3521 { 3522 struct net_device *dev = idev->dev; 3523 struct nlattr *nla; 3524 struct ifinfomsg *hdr; 3525 struct nlmsghdr *nlh; 3526 void *protoinfo; 3527 struct ifla_cacheinfo ci; 3528 3529 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3530 if (nlh == NULL) 3531 return -EMSGSIZE; 3532 3533 hdr = nlmsg_data(nlh); 3534 hdr->ifi_family = AF_INET6; 3535 hdr->__ifi_pad = 0; 3536 hdr->ifi_type = dev->type; 3537 hdr->ifi_index = dev->ifindex; 3538 hdr->ifi_flags = dev_get_flags(dev); 3539 hdr->ifi_change = 0; 3540 3541 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3542 3543 if (dev->addr_len) 3544 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3545 3546 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3547 if (dev->ifindex != dev->iflink) 3548 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3549 3550 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3551 if (protoinfo == NULL) 3552 goto nla_put_failure; 3553 3554 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3555 3556 ci.max_reasm_len = IPV6_MAXPLEN; 3557 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3558 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3559 ci.reachable_time = idev->nd_parms->reachable_time; 3560 ci.retrans_time = idev->nd_parms->retrans_time; 3561 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3562 3563 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3564 if (nla == NULL) 3565 goto nla_put_failure; 3566 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3567 3568 /* XXX - MC not implemented */ 3569 3570 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3571 if (nla == NULL) 3572 goto nla_put_failure; 3573 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3574 3575 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3576 if (nla == NULL) 3577 goto nla_put_failure; 3578 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3579 3580 nla_nest_end(skb, protoinfo); 3581 return nlmsg_end(skb, nlh); 3582 3583 nla_put_failure: 3584 nlmsg_cancel(skb, nlh); 3585 return -EMSGSIZE; 3586 } 3587 3588 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3589 { 3590 int idx, err; 3591 int s_idx = cb->args[0]; 3592 struct net_device *dev; 3593 struct inet6_dev *idev; 3594 3595 read_lock(&dev_base_lock); 3596 idx = 0; 3597 for_each_netdev(&init_net, dev) { 3598 if (idx < s_idx) 3599 goto cont; 3600 if ((idev = in6_dev_get(dev)) == NULL) 3601 goto cont; 3602 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3603 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3604 in6_dev_put(idev); 3605 if (err <= 0) 3606 break; 3607 cont: 3608 idx++; 3609 } 3610 read_unlock(&dev_base_lock); 3611 cb->args[0] = idx; 3612 3613 return skb->len; 3614 } 3615 3616 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3617 { 3618 struct sk_buff *skb; 3619 int err = -ENOBUFS; 3620 3621 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3622 if (skb == NULL) 3623 goto errout; 3624 3625 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3626 if (err < 0) { 3627 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3628 WARN_ON(err == -EMSGSIZE); 3629 kfree_skb(skb); 3630 goto errout; 3631 } 3632 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3633 errout: 3634 if (err < 0) 3635 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3636 } 3637 3638 static inline size_t inet6_prefix_nlmsg_size(void) 3639 { 3640 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3641 + nla_total_size(sizeof(struct in6_addr)) 3642 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3643 } 3644 3645 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3646 struct prefix_info *pinfo, u32 pid, u32 seq, 3647 int event, unsigned int flags) 3648 { 3649 struct prefixmsg *pmsg; 3650 struct nlmsghdr *nlh; 3651 struct prefix_cacheinfo ci; 3652 3653 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3654 if (nlh == NULL) 3655 return -EMSGSIZE; 3656 3657 pmsg = nlmsg_data(nlh); 3658 pmsg->prefix_family = AF_INET6; 3659 pmsg->prefix_pad1 = 0; 3660 pmsg->prefix_pad2 = 0; 3661 pmsg->prefix_ifindex = idev->dev->ifindex; 3662 pmsg->prefix_len = pinfo->prefix_len; 3663 pmsg->prefix_type = pinfo->type; 3664 pmsg->prefix_pad3 = 0; 3665 pmsg->prefix_flags = 0; 3666 if (pinfo->onlink) 3667 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3668 if (pinfo->autoconf) 3669 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3670 3671 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3672 3673 ci.preferred_time = ntohl(pinfo->prefered); 3674 ci.valid_time = ntohl(pinfo->valid); 3675 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3676 3677 return nlmsg_end(skb, nlh); 3678 3679 nla_put_failure: 3680 nlmsg_cancel(skb, nlh); 3681 return -EMSGSIZE; 3682 } 3683 3684 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3685 struct prefix_info *pinfo) 3686 { 3687 struct sk_buff *skb; 3688 int err = -ENOBUFS; 3689 3690 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3691 if (skb == NULL) 3692 goto errout; 3693 3694 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3695 if (err < 0) { 3696 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3697 WARN_ON(err == -EMSGSIZE); 3698 kfree_skb(skb); 3699 goto errout; 3700 } 3701 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3702 errout: 3703 if (err < 0) 3704 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err); 3705 } 3706 3707 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3708 { 3709 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3710 3711 switch (event) { 3712 case RTM_NEWADDR: 3713 /* 3714 * If the address was optimistic 3715 * we inserted the route at the start of 3716 * our DAD process, so we don't need 3717 * to do it again 3718 */ 3719 if (!(ifp->rt->rt6i_node)) 3720 ip6_ins_rt(ifp->rt); 3721 if (ifp->idev->cnf.forwarding) 3722 addrconf_join_anycast(ifp); 3723 break; 3724 case RTM_DELADDR: 3725 if (ifp->idev->cnf.forwarding) 3726 addrconf_leave_anycast(ifp); 3727 addrconf_leave_solict(ifp->idev, &ifp->addr); 3728 dst_hold(&ifp->rt->u.dst); 3729 if (ip6_del_rt(ifp->rt)) 3730 dst_free(&ifp->rt->u.dst); 3731 break; 3732 } 3733 } 3734 3735 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3736 { 3737 rcu_read_lock_bh(); 3738 if (likely(ifp->idev->dead == 0)) 3739 __ipv6_ifa_notify(event, ifp); 3740 rcu_read_unlock_bh(); 3741 } 3742 3743 #ifdef CONFIG_SYSCTL 3744 3745 static 3746 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3747 void __user *buffer, size_t *lenp, loff_t *ppos) 3748 { 3749 int *valp = ctl->data; 3750 int val = *valp; 3751 int ret; 3752 3753 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3754 3755 if (write && valp != &ipv6_devconf_dflt.forwarding) { 3756 if (valp != &ipv6_devconf.forwarding) { 3757 if ((!*valp) ^ (!val)) { 3758 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 3759 if (idev == NULL) 3760 return ret; 3761 dev_forward_change(idev); 3762 } 3763 } else { 3764 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; 3765 addrconf_forward_change(); 3766 } 3767 if (*valp) 3768 rt6_purge_dflt_routers(); 3769 } 3770 3771 return ret; 3772 } 3773 3774 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3775 int __user *name, int nlen, 3776 void __user *oldval, 3777 size_t __user *oldlenp, 3778 void __user *newval, size_t newlen) 3779 { 3780 int *valp = table->data; 3781 int new; 3782 3783 if (!newval || !newlen) 3784 return 0; 3785 if (newlen != sizeof(int)) 3786 return -EINVAL; 3787 if (get_user(new, (int __user *)newval)) 3788 return -EFAULT; 3789 if (new == *valp) 3790 return 0; 3791 if (oldval && oldlenp) { 3792 size_t len; 3793 if (get_user(len, oldlenp)) 3794 return -EFAULT; 3795 if (len) { 3796 if (len > table->maxlen) 3797 len = table->maxlen; 3798 if (copy_to_user(oldval, valp, len)) 3799 return -EFAULT; 3800 if (put_user(len, oldlenp)) 3801 return -EFAULT; 3802 } 3803 } 3804 3805 if (valp != &ipv6_devconf_dflt.forwarding) { 3806 if (valp != &ipv6_devconf.forwarding) { 3807 struct inet6_dev *idev = (struct inet6_dev *)table->extra1; 3808 int changed; 3809 if (unlikely(idev == NULL)) 3810 return -ENODEV; 3811 changed = (!*valp) ^ (!new); 3812 *valp = new; 3813 if (changed) 3814 dev_forward_change(idev); 3815 } else { 3816 *valp = new; 3817 addrconf_forward_change(); 3818 } 3819 3820 if (*valp) 3821 rt6_purge_dflt_routers(); 3822 } else 3823 *valp = new; 3824 3825 return 1; 3826 } 3827 3828 static struct addrconf_sysctl_table 3829 { 3830 struct ctl_table_header *sysctl_header; 3831 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3832 ctl_table addrconf_dev[2]; 3833 ctl_table addrconf_conf_dir[2]; 3834 ctl_table addrconf_proto_dir[2]; 3835 ctl_table addrconf_root_dir[2]; 3836 } addrconf_sysctl __read_mostly = { 3837 .sysctl_header = NULL, 3838 .addrconf_vars = { 3839 { 3840 .ctl_name = NET_IPV6_FORWARDING, 3841 .procname = "forwarding", 3842 .data = &ipv6_devconf.forwarding, 3843 .maxlen = sizeof(int), 3844 .mode = 0644, 3845 .proc_handler = &addrconf_sysctl_forward, 3846 .strategy = &addrconf_sysctl_forward_strategy, 3847 }, 3848 { 3849 .ctl_name = NET_IPV6_HOP_LIMIT, 3850 .procname = "hop_limit", 3851 .data = &ipv6_devconf.hop_limit, 3852 .maxlen = sizeof(int), 3853 .mode = 0644, 3854 .proc_handler = proc_dointvec, 3855 }, 3856 { 3857 .ctl_name = NET_IPV6_MTU, 3858 .procname = "mtu", 3859 .data = &ipv6_devconf.mtu6, 3860 .maxlen = sizeof(int), 3861 .mode = 0644, 3862 .proc_handler = &proc_dointvec, 3863 }, 3864 { 3865 .ctl_name = NET_IPV6_ACCEPT_RA, 3866 .procname = "accept_ra", 3867 .data = &ipv6_devconf.accept_ra, 3868 .maxlen = sizeof(int), 3869 .mode = 0644, 3870 .proc_handler = &proc_dointvec, 3871 }, 3872 { 3873 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3874 .procname = "accept_redirects", 3875 .data = &ipv6_devconf.accept_redirects, 3876 .maxlen = sizeof(int), 3877 .mode = 0644, 3878 .proc_handler = &proc_dointvec, 3879 }, 3880 { 3881 .ctl_name = NET_IPV6_AUTOCONF, 3882 .procname = "autoconf", 3883 .data = &ipv6_devconf.autoconf, 3884 .maxlen = sizeof(int), 3885 .mode = 0644, 3886 .proc_handler = &proc_dointvec, 3887 }, 3888 { 3889 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3890 .procname = "dad_transmits", 3891 .data = &ipv6_devconf.dad_transmits, 3892 .maxlen = sizeof(int), 3893 .mode = 0644, 3894 .proc_handler = &proc_dointvec, 3895 }, 3896 { 3897 .ctl_name = NET_IPV6_RTR_SOLICITS, 3898 .procname = "router_solicitations", 3899 .data = &ipv6_devconf.rtr_solicits, 3900 .maxlen = sizeof(int), 3901 .mode = 0644, 3902 .proc_handler = &proc_dointvec, 3903 }, 3904 { 3905 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3906 .procname = "router_solicitation_interval", 3907 .data = &ipv6_devconf.rtr_solicit_interval, 3908 .maxlen = sizeof(int), 3909 .mode = 0644, 3910 .proc_handler = &proc_dointvec_jiffies, 3911 .strategy = &sysctl_jiffies, 3912 }, 3913 { 3914 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3915 .procname = "router_solicitation_delay", 3916 .data = &ipv6_devconf.rtr_solicit_delay, 3917 .maxlen = sizeof(int), 3918 .mode = 0644, 3919 .proc_handler = &proc_dointvec_jiffies, 3920 .strategy = &sysctl_jiffies, 3921 }, 3922 { 3923 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3924 .procname = "force_mld_version", 3925 .data = &ipv6_devconf.force_mld_version, 3926 .maxlen = sizeof(int), 3927 .mode = 0644, 3928 .proc_handler = &proc_dointvec, 3929 }, 3930 #ifdef CONFIG_IPV6_PRIVACY 3931 { 3932 .ctl_name = NET_IPV6_USE_TEMPADDR, 3933 .procname = "use_tempaddr", 3934 .data = &ipv6_devconf.use_tempaddr, 3935 .maxlen = sizeof(int), 3936 .mode = 0644, 3937 .proc_handler = &proc_dointvec, 3938 }, 3939 { 3940 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3941 .procname = "temp_valid_lft", 3942 .data = &ipv6_devconf.temp_valid_lft, 3943 .maxlen = sizeof(int), 3944 .mode = 0644, 3945 .proc_handler = &proc_dointvec, 3946 }, 3947 { 3948 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3949 .procname = "temp_prefered_lft", 3950 .data = &ipv6_devconf.temp_prefered_lft, 3951 .maxlen = sizeof(int), 3952 .mode = 0644, 3953 .proc_handler = &proc_dointvec, 3954 }, 3955 { 3956 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3957 .procname = "regen_max_retry", 3958 .data = &ipv6_devconf.regen_max_retry, 3959 .maxlen = sizeof(int), 3960 .mode = 0644, 3961 .proc_handler = &proc_dointvec, 3962 }, 3963 { 3964 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3965 .procname = "max_desync_factor", 3966 .data = &ipv6_devconf.max_desync_factor, 3967 .maxlen = sizeof(int), 3968 .mode = 0644, 3969 .proc_handler = &proc_dointvec, 3970 }, 3971 #endif 3972 { 3973 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3974 .procname = "max_addresses", 3975 .data = &ipv6_devconf.max_addresses, 3976 .maxlen = sizeof(int), 3977 .mode = 0644, 3978 .proc_handler = &proc_dointvec, 3979 }, 3980 { 3981 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 3982 .procname = "accept_ra_defrtr", 3983 .data = &ipv6_devconf.accept_ra_defrtr, 3984 .maxlen = sizeof(int), 3985 .mode = 0644, 3986 .proc_handler = &proc_dointvec, 3987 }, 3988 { 3989 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 3990 .procname = "accept_ra_pinfo", 3991 .data = &ipv6_devconf.accept_ra_pinfo, 3992 .maxlen = sizeof(int), 3993 .mode = 0644, 3994 .proc_handler = &proc_dointvec, 3995 }, 3996 #ifdef CONFIG_IPV6_ROUTER_PREF 3997 { 3998 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 3999 .procname = "accept_ra_rtr_pref", 4000 .data = &ipv6_devconf.accept_ra_rtr_pref, 4001 .maxlen = sizeof(int), 4002 .mode = 0644, 4003 .proc_handler = &proc_dointvec, 4004 }, 4005 { 4006 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4007 .procname = "router_probe_interval", 4008 .data = &ipv6_devconf.rtr_probe_interval, 4009 .maxlen = sizeof(int), 4010 .mode = 0644, 4011 .proc_handler = &proc_dointvec_jiffies, 4012 .strategy = &sysctl_jiffies, 4013 }, 4014 #ifdef CONFIG_IPV6_ROUTE_INFO 4015 { 4016 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4017 .procname = "accept_ra_rt_info_max_plen", 4018 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4019 .maxlen = sizeof(int), 4020 .mode = 0644, 4021 .proc_handler = &proc_dointvec, 4022 }, 4023 #endif 4024 #endif 4025 { 4026 .ctl_name = NET_IPV6_PROXY_NDP, 4027 .procname = "proxy_ndp", 4028 .data = &ipv6_devconf.proxy_ndp, 4029 .maxlen = sizeof(int), 4030 .mode = 0644, 4031 .proc_handler = &proc_dointvec, 4032 }, 4033 { 4034 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4035 .procname = "accept_source_route", 4036 .data = &ipv6_devconf.accept_source_route, 4037 .maxlen = sizeof(int), 4038 .mode = 0644, 4039 .proc_handler = &proc_dointvec, 4040 }, 4041 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4042 { 4043 .ctl_name = CTL_UNNUMBERED, 4044 .procname = "optimistic_dad", 4045 .data = &ipv6_devconf.optimistic_dad, 4046 .maxlen = sizeof(int), 4047 .mode = 0644, 4048 .proc_handler = &proc_dointvec, 4049 4050 }, 4051 #endif 4052 { 4053 .ctl_name = 0, /* sentinel */ 4054 } 4055 }, 4056 .addrconf_dev = { 4057 { 4058 .ctl_name = NET_PROTO_CONF_ALL, 4059 .procname = "all", 4060 .mode = 0555, 4061 .child = addrconf_sysctl.addrconf_vars, 4062 }, 4063 { 4064 .ctl_name = 0, /* sentinel */ 4065 } 4066 }, 4067 .addrconf_conf_dir = { 4068 { 4069 .ctl_name = NET_IPV6_CONF, 4070 .procname = "conf", 4071 .mode = 0555, 4072 .child = addrconf_sysctl.addrconf_dev, 4073 }, 4074 { 4075 .ctl_name = 0, /* sentinel */ 4076 } 4077 }, 4078 .addrconf_proto_dir = { 4079 { 4080 .ctl_name = NET_IPV6, 4081 .procname = "ipv6", 4082 .mode = 0555, 4083 .child = addrconf_sysctl.addrconf_conf_dir, 4084 }, 4085 { 4086 .ctl_name = 0, /* sentinel */ 4087 } 4088 }, 4089 .addrconf_root_dir = { 4090 { 4091 .ctl_name = CTL_NET, 4092 .procname = "net", 4093 .mode = 0555, 4094 .child = addrconf_sysctl.addrconf_proto_dir, 4095 }, 4096 { 4097 .ctl_name = 0, /* sentinel */ 4098 } 4099 }, 4100 }; 4101 4102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) 4103 { 4104 int i; 4105 struct net_device *dev = idev ? idev->dev : NULL; 4106 struct addrconf_sysctl_table *t; 4107 char *dev_name = NULL; 4108 4109 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4110 if (t == NULL) 4111 return; 4112 for (i=0; t->addrconf_vars[i].data; i++) { 4113 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4114 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4115 } 4116 if (dev) { 4117 dev_name = dev->name; 4118 t->addrconf_dev[0].ctl_name = dev->ifindex; 4119 } else { 4120 dev_name = "default"; 4121 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 4122 } 4123 4124 /* 4125 * Make a copy of dev_name, because '.procname' is regarded as const 4126 * by sysctl and we wouldn't want anyone to change it under our feet 4127 * (see SIOCSIFNAME). 4128 */ 4129 dev_name = kstrdup(dev_name, GFP_KERNEL); 4130 if (!dev_name) 4131 goto free; 4132 4133 t->addrconf_dev[0].procname = dev_name; 4134 4135 t->addrconf_dev[0].child = t->addrconf_vars; 4136 t->addrconf_conf_dir[0].child = t->addrconf_dev; 4137 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; 4138 t->addrconf_root_dir[0].child = t->addrconf_proto_dir; 4139 4140 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir); 4141 if (t->sysctl_header == NULL) 4142 goto free_procname; 4143 else 4144 p->sysctl = t; 4145 return; 4146 4147 /* error path */ 4148 free_procname: 4149 kfree(dev_name); 4150 free: 4151 kfree(t); 4152 4153 return; 4154 } 4155 4156 static void addrconf_sysctl_unregister(struct ipv6_devconf *p) 4157 { 4158 if (p->sysctl) { 4159 struct addrconf_sysctl_table *t = p->sysctl; 4160 p->sysctl = NULL; 4161 unregister_sysctl_table(t->sysctl_header); 4162 kfree(t->addrconf_dev[0].procname); 4163 kfree(t); 4164 } 4165 } 4166 4167 4168 #endif 4169 4170 /* 4171 * Device notifier 4172 */ 4173 4174 int register_inet6addr_notifier(struct notifier_block *nb) 4175 { 4176 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4177 } 4178 4179 EXPORT_SYMBOL(register_inet6addr_notifier); 4180 4181 int unregister_inet6addr_notifier(struct notifier_block *nb) 4182 { 4183 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4184 } 4185 4186 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4187 4188 /* 4189 * Init / cleanup code 4190 */ 4191 4192 int __init addrconf_init(void) 4193 { 4194 int err = 0; 4195 4196 /* The addrconf netdev notifier requires that loopback_dev 4197 * has it's ipv6 private information allocated and setup 4198 * before it can bring up and give link-local addresses 4199 * to other devices which are up. 4200 * 4201 * Unfortunately, loopback_dev is not necessarily the first 4202 * entry in the global dev_base list of net devices. In fact, 4203 * it is likely to be the very last entry on that list. 4204 * So this causes the notifier registry below to try and 4205 * give link-local addresses to all devices besides loopback_dev 4206 * first, then loopback_dev, which cases all the non-loopback_dev 4207 * devices to fail to get a link-local address. 4208 * 4209 * So, as a temporary fix, allocate the ipv6 structure for 4210 * loopback_dev first by hand. 4211 * Longer term, all of the dependencies ipv6 has upon the loopback 4212 * device and it being up should be removed. 4213 */ 4214 rtnl_lock(); 4215 if (!ipv6_add_dev(loopback_dev)) 4216 err = -ENOMEM; 4217 rtnl_unlock(); 4218 if (err) 4219 return err; 4220 4221 ip6_null_entry.u.dst.dev = loopback_dev; 4222 ip6_null_entry.rt6i_idev = in6_dev_get(loopback_dev); 4223 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 4224 ip6_prohibit_entry.u.dst.dev = loopback_dev; 4225 ip6_prohibit_entry.rt6i_idev = in6_dev_get(loopback_dev); 4226 ip6_blk_hole_entry.u.dst.dev = loopback_dev; 4227 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(loopback_dev); 4228 #endif 4229 4230 register_netdevice_notifier(&ipv6_dev_notf); 4231 4232 addrconf_verify(0); 4233 4234 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4235 if (err < 0) 4236 goto errout; 4237 4238 /* Only the first call to __rtnl_register can fail */ 4239 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4240 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4241 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4242 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4243 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4244 4245 #ifdef CONFIG_SYSCTL 4246 addrconf_sysctl.sysctl_header = 4247 register_sysctl_table(addrconf_sysctl.addrconf_root_dir); 4248 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); 4249 #endif 4250 4251 return 0; 4252 errout: 4253 unregister_netdevice_notifier(&ipv6_dev_notf); 4254 4255 return err; 4256 } 4257 4258 void __exit addrconf_cleanup(void) 4259 { 4260 struct net_device *dev; 4261 struct inet6_ifaddr *ifa; 4262 int i; 4263 4264 unregister_netdevice_notifier(&ipv6_dev_notf); 4265 4266 #ifdef CONFIG_SYSCTL 4267 addrconf_sysctl_unregister(&ipv6_devconf_dflt); 4268 addrconf_sysctl_unregister(&ipv6_devconf); 4269 #endif 4270 4271 rtnl_lock(); 4272 4273 /* 4274 * clean dev list. 4275 */ 4276 4277 for_each_netdev(&init_net, dev) { 4278 if (__in6_dev_get(dev) == NULL) 4279 continue; 4280 addrconf_ifdown(dev, 1); 4281 } 4282 addrconf_ifdown(loopback_dev, 2); 4283 4284 /* 4285 * Check hash table. 4286 */ 4287 4288 write_lock_bh(&addrconf_hash_lock); 4289 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4290 for (ifa=inet6_addr_lst[i]; ifa; ) { 4291 struct inet6_ifaddr *bifa; 4292 4293 bifa = ifa; 4294 ifa = ifa->lst_next; 4295 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4296 /* Do not free it; something is wrong. 4297 Now we can investigate it with debugger. 4298 */ 4299 } 4300 } 4301 write_unlock_bh(&addrconf_hash_lock); 4302 4303 del_timer(&addr_chk_timer); 4304 4305 rtnl_unlock(); 4306 4307 #ifdef CONFIG_PROC_FS 4308 proc_net_remove(&init_net, "if_inet6"); 4309 #endif 4310 } 4311