1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 /* 18 * Changes: 19 * 20 * Janos Farkas : delete timer on ifdown 21 * <chexum@bankinf.banki.hu> 22 * Andi Kleen : kill double kfree on module 23 * unload. 24 * Maciej W. Rozycki : FDDI support 25 * sekiya@USAGI : Don't send too many RS 26 * packets. 27 * yoshfuji@USAGI : Fixed interval between DAD 28 * packets. 29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 30 * address validation timer. 31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 32 * support. 33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 34 * address on a same interface. 35 * YOSHIFUJI Hideaki @USAGI : ARCnet support 36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 37 * seq_file. 38 * YOSHIFUJI Hideaki @USAGI : improved source address 39 * selection; consider scope, 40 * status etc. 41 */ 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/socket.h> 46 #include <linux/sockios.h> 47 #include <linux/net.h> 48 #include <linux/in6.h> 49 #include <linux/netdevice.h> 50 #include <linux/if_addr.h> 51 #include <linux/if_arp.h> 52 #include <linux/if_arcnet.h> 53 #include <linux/if_infiniband.h> 54 #include <linux/route.h> 55 #include <linux/inetdevice.h> 56 #include <linux/init.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <asm/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 91 /* Set to 3 to get tracing... */ 92 #define ACONF_DEBUG 2 93 94 #if ACONF_DEBUG >= 3 95 #define ADBG(x) printk x 96 #else 97 #define ADBG(x) 98 #endif 99 100 #define INFINITY_LIFE_TIME 0xFFFFFFFF 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 102 103 #ifdef CONFIG_SYSCTL 104 static void addrconf_sysctl_register(struct inet6_dev *idev); 105 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 106 #else 107 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 108 { 109 } 110 111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 112 { 113 } 114 #endif 115 116 #ifdef CONFIG_IPV6_PRIVACY 117 static int __ipv6_regen_rndid(struct inet6_dev *idev); 118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 119 static void ipv6_regen_rndid(unsigned long data); 120 121 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 122 #endif 123 124 static int ipv6_count_addresses(struct inet6_dev *idev); 125 126 /* 127 * Configured unicast address hash table 128 */ 129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 130 static DEFINE_RWLOCK(addrconf_hash_lock); 131 132 static void addrconf_verify(unsigned long); 133 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 135 static DEFINE_SPINLOCK(addrconf_verify_lock); 136 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 139 140 static int addrconf_ifdown(struct net_device *dev, int how); 141 142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 143 static void addrconf_dad_timer(unsigned long data); 144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 145 static void addrconf_dad_run(struct inet6_dev *idev); 146 static void addrconf_rs_timer(unsigned long data); 147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 149 150 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 151 struct prefix_info *pinfo); 152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 153 struct net_device *dev); 154 155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 156 157 struct ipv6_devconf ipv6_devconf __read_mostly = { 158 .forwarding = 0, 159 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 160 .mtu6 = IPV6_MIN_MTU, 161 .accept_ra = 1, 162 .accept_redirects = 1, 163 .autoconf = 1, 164 .force_mld_version = 0, 165 .dad_transmits = 1, 166 .rtr_solicits = MAX_RTR_SOLICITATIONS, 167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 169 #ifdef CONFIG_IPV6_PRIVACY 170 .use_tempaddr = 0, 171 .temp_valid_lft = TEMP_VALID_LIFETIME, 172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 173 .regen_max_retry = REGEN_MAX_RETRY, 174 .max_desync_factor = MAX_DESYNC_FACTOR, 175 #endif 176 .max_addresses = IPV6_MAX_ADDRESSES, 177 .accept_ra_defrtr = 1, 178 .accept_ra_pinfo = 1, 179 #ifdef CONFIG_IPV6_ROUTER_PREF 180 .accept_ra_rtr_pref = 1, 181 .rtr_probe_interval = 60 * HZ, 182 #ifdef CONFIG_IPV6_ROUTE_INFO 183 .accept_ra_rt_info_max_plen = 0, 184 #endif 185 #endif 186 .proxy_ndp = 0, 187 .accept_source_route = 0, /* we do not accept RH0 by default. */ 188 }; 189 190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .dad_transmits = 1, 198 .rtr_solicits = MAX_RTR_SOLICITATIONS, 199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 201 #ifdef CONFIG_IPV6_PRIVACY 202 .use_tempaddr = 0, 203 .temp_valid_lft = TEMP_VALID_LIFETIME, 204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 205 .regen_max_retry = REGEN_MAX_RETRY, 206 .max_desync_factor = MAX_DESYNC_FACTOR, 207 #endif 208 .max_addresses = IPV6_MAX_ADDRESSES, 209 .accept_ra_defrtr = 1, 210 .accept_ra_pinfo = 1, 211 #ifdef CONFIG_IPV6_ROUTER_PREF 212 .accept_ra_rtr_pref = 1, 213 .rtr_probe_interval = 60 * HZ, 214 #ifdef CONFIG_IPV6_ROUTE_INFO 215 .accept_ra_rt_info_max_plen = 0, 216 #endif 217 #endif 218 .proxy_ndp = 0, 219 .accept_source_route = 0, /* we do not accept RH0 by default. */ 220 }; 221 222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 225 226 /* Check if a valid qdisc is available */ 227 static inline int addrconf_qdisc_ok(struct net_device *dev) 228 { 229 return (dev->qdisc != &noop_qdisc); 230 } 231 232 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 233 { 234 if (del_timer(&ifp->timer)) 235 __in6_ifa_put(ifp); 236 } 237 238 enum addrconf_timer_t 239 { 240 AC_NONE, 241 AC_DAD, 242 AC_RS, 243 }; 244 245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 246 enum addrconf_timer_t what, 247 unsigned long when) 248 { 249 if (!del_timer(&ifp->timer)) 250 in6_ifa_hold(ifp); 251 252 switch (what) { 253 case AC_DAD: 254 ifp->timer.function = addrconf_dad_timer; 255 break; 256 case AC_RS: 257 ifp->timer.function = addrconf_rs_timer; 258 break; 259 default:; 260 } 261 ifp->timer.expires = jiffies + when; 262 add_timer(&ifp->timer); 263 } 264 265 static int snmp6_alloc_dev(struct inet6_dev *idev) 266 { 267 if (snmp_mib_init((void **)idev->stats.ipv6, 268 sizeof(struct ipstats_mib)) < 0) 269 goto err_ip; 270 if (snmp_mib_init((void **)idev->stats.icmpv6, 271 sizeof(struct icmpv6_mib)) < 0) 272 goto err_icmp; 273 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 274 sizeof(struct icmpv6msg_mib)) < 0) 275 goto err_icmpmsg; 276 277 return 0; 278 279 err_icmpmsg: 280 snmp_mib_free((void **)idev->stats.icmpv6); 281 err_icmp: 282 snmp_mib_free((void **)idev->stats.ipv6); 283 err_ip: 284 return -ENOMEM; 285 } 286 287 static void snmp6_free_dev(struct inet6_dev *idev) 288 { 289 snmp_mib_free((void **)idev->stats.icmpv6msg); 290 snmp_mib_free((void **)idev->stats.icmpv6); 291 snmp_mib_free((void **)idev->stats.ipv6); 292 } 293 294 /* Nobody refers to this device, we may destroy it. */ 295 296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 297 { 298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 299 kfree(idev); 300 } 301 302 void in6_dev_finish_destroy(struct inet6_dev *idev) 303 { 304 struct net_device *dev = idev->dev; 305 BUG_TRAP(idev->addr_list==NULL); 306 BUG_TRAP(idev->mc_list==NULL); 307 #ifdef NET_REFCNT_DEBUG 308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 309 #endif 310 dev_put(dev); 311 if (!idev->dead) { 312 printk("Freeing alive inet6 device %p\n", idev); 313 return; 314 } 315 snmp6_free_dev(idev); 316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 317 } 318 319 EXPORT_SYMBOL(in6_dev_finish_destroy); 320 321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 322 { 323 struct inet6_dev *ndev; 324 struct in6_addr maddr; 325 326 ASSERT_RTNL(); 327 328 if (dev->mtu < IPV6_MIN_MTU) 329 return NULL; 330 331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 332 333 if (ndev == NULL) 334 return NULL; 335 336 rwlock_init(&ndev->lock); 337 ndev->dev = dev; 338 memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf)); 339 ndev->cnf.mtu6 = dev->mtu; 340 ndev->cnf.sysctl = NULL; 341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 342 if (ndev->nd_parms == NULL) { 343 kfree(ndev); 344 return NULL; 345 } 346 /* We refer to the device */ 347 dev_hold(dev); 348 349 if (snmp6_alloc_dev(ndev) < 0) { 350 ADBG((KERN_WARNING 351 "%s(): cannot allocate memory for statistics; dev=%s.\n", 352 __FUNCTION__, dev->name)); 353 neigh_parms_release(&nd_tbl, ndev->nd_parms); 354 ndev->dead = 1; 355 in6_dev_finish_destroy(ndev); 356 return NULL; 357 } 358 359 if (snmp6_register_dev(ndev) < 0) { 360 ADBG((KERN_WARNING 361 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 362 __FUNCTION__, dev->name)); 363 neigh_parms_release(&nd_tbl, ndev->nd_parms); 364 ndev->dead = 1; 365 in6_dev_finish_destroy(ndev); 366 return NULL; 367 } 368 369 /* One reference from device. We must do this before 370 * we invoke __ipv6_regen_rndid(). 371 */ 372 in6_dev_hold(ndev); 373 374 #ifdef CONFIG_IPV6_PRIVACY 375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 376 if ((dev->flags&IFF_LOOPBACK) || 377 dev->type == ARPHRD_TUNNEL || 378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 379 dev->type == ARPHRD_SIT || 380 #endif 381 dev->type == ARPHRD_NONE) { 382 printk(KERN_INFO 383 "%s: Disabled Privacy Extensions\n", 384 dev->name); 385 ndev->cnf.use_tempaddr = -1; 386 387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 388 printk(KERN_INFO 389 "%s: Disabled Multicast RS\n", 390 dev->name); 391 ndev->cnf.rtr_solicits = 0; 392 } 393 } else { 394 in6_dev_hold(ndev); 395 ipv6_regen_rndid((unsigned long) ndev); 396 } 397 #endif 398 399 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 400 ndev->if_flags |= IF_READY; 401 402 ipv6_mc_init_dev(ndev); 403 ndev->tstamp = jiffies; 404 addrconf_sysctl_register(ndev); 405 /* protected by rtnl_lock */ 406 rcu_assign_pointer(dev->ip6_ptr, ndev); 407 408 /* Join all-node multicast group */ 409 ipv6_addr_all_nodes(&maddr); 410 ipv6_dev_mc_inc(dev, &maddr); 411 412 return ndev; 413 } 414 415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 416 { 417 struct inet6_dev *idev; 418 419 ASSERT_RTNL(); 420 421 if ((idev = __in6_dev_get(dev)) == NULL) { 422 if ((idev = ipv6_add_dev(dev)) == NULL) 423 return NULL; 424 } 425 426 if (dev->flags&IFF_UP) 427 ipv6_mc_up(idev); 428 return idev; 429 } 430 431 #ifdef CONFIG_SYSCTL 432 static void dev_forward_change(struct inet6_dev *idev) 433 { 434 struct net_device *dev; 435 struct inet6_ifaddr *ifa; 436 struct in6_addr addr; 437 438 if (!idev) 439 return; 440 dev = idev->dev; 441 if (dev && (dev->flags & IFF_MULTICAST)) { 442 ipv6_addr_all_routers(&addr); 443 444 if (idev->cnf.forwarding) 445 ipv6_dev_mc_inc(dev, &addr); 446 else 447 ipv6_dev_mc_dec(dev, &addr); 448 } 449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 450 if (ifa->flags&IFA_F_TENTATIVE) 451 continue; 452 if (idev->cnf.forwarding) 453 addrconf_join_anycast(ifa); 454 else 455 addrconf_leave_anycast(ifa); 456 } 457 } 458 459 460 static void addrconf_forward_change(struct net *net, __s32 newf) 461 { 462 struct net_device *dev; 463 struct inet6_dev *idev; 464 465 read_lock(&dev_base_lock); 466 for_each_netdev(net, dev) { 467 rcu_read_lock(); 468 idev = __in6_dev_get(dev); 469 if (idev) { 470 int changed = (!idev->cnf.forwarding) ^ (!newf); 471 idev->cnf.forwarding = newf; 472 if (changed) 473 dev_forward_change(idev); 474 } 475 rcu_read_unlock(); 476 } 477 read_unlock(&dev_base_lock); 478 } 479 480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 481 { 482 struct net *net; 483 484 net = (struct net *)table->extra2; 485 if (p == &net->ipv6.devconf_dflt->forwarding) 486 return; 487 488 if (p == &net->ipv6.devconf_all->forwarding) { 489 __s32 newf = net->ipv6.devconf_all->forwarding; 490 net->ipv6.devconf_dflt->forwarding = newf; 491 addrconf_forward_change(net, newf); 492 } else if ((!*p) ^ (!old)) 493 dev_forward_change((struct inet6_dev *)table->extra1); 494 495 if (*p) 496 rt6_purge_dflt_routers(); 497 } 498 #endif 499 500 /* Nobody refers to this ifaddr, destroy it */ 501 502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 503 { 504 BUG_TRAP(ifp->if_next==NULL); 505 BUG_TRAP(ifp->lst_next==NULL); 506 #ifdef NET_REFCNT_DEBUG 507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 508 #endif 509 510 in6_dev_put(ifp->idev); 511 512 if (del_timer(&ifp->timer)) 513 printk("Timer is still running, when freeing ifa=%p\n", ifp); 514 515 if (!ifp->dead) { 516 printk("Freeing alive inet6 address %p\n", ifp); 517 return; 518 } 519 dst_release(&ifp->rt->u.dst); 520 521 kfree(ifp); 522 } 523 524 static void 525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 526 { 527 struct inet6_ifaddr *ifa, **ifap; 528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 529 530 /* 531 * Each device address list is sorted in order of scope - 532 * global before linklocal. 533 */ 534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 535 ifap = &ifa->if_next) { 536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 537 break; 538 } 539 540 ifp->if_next = *ifap; 541 *ifap = ifp; 542 } 543 544 /* On success it returns ifp with increased reference count */ 545 546 static struct inet6_ifaddr * 547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 548 int scope, u32 flags) 549 { 550 struct inet6_ifaddr *ifa = NULL; 551 struct rt6_info *rt; 552 int hash; 553 int err = 0; 554 555 rcu_read_lock_bh(); 556 if (idev->dead) { 557 err = -ENODEV; /*XXX*/ 558 goto out2; 559 } 560 561 write_lock(&addrconf_hash_lock); 562 563 /* Ignore adding duplicate addresses on an interface */ 564 if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) { 565 ADBG(("ipv6_add_addr: already assigned\n")); 566 err = -EEXIST; 567 goto out; 568 } 569 570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 571 572 if (ifa == NULL) { 573 ADBG(("ipv6_add_addr: malloc failed\n")); 574 err = -ENOBUFS; 575 goto out; 576 } 577 578 rt = addrconf_dst_alloc(idev, addr, 0); 579 if (IS_ERR(rt)) { 580 err = PTR_ERR(rt); 581 goto out; 582 } 583 584 ipv6_addr_copy(&ifa->addr, addr); 585 586 spin_lock_init(&ifa->lock); 587 init_timer(&ifa->timer); 588 ifa->timer.data = (unsigned long) ifa; 589 ifa->scope = scope; 590 ifa->prefix_len = pfxlen; 591 ifa->flags = flags | IFA_F_TENTATIVE; 592 ifa->cstamp = ifa->tstamp = jiffies; 593 594 ifa->rt = rt; 595 596 /* 597 * part one of RFC 4429, section 3.3 598 * We should not configure an address as 599 * optimistic if we do not yet know the link 600 * layer address of our nexhop router 601 */ 602 603 if (rt->rt6i_nexthop == NULL) 604 ifa->flags &= ~IFA_F_OPTIMISTIC; 605 606 ifa->idev = idev; 607 in6_dev_hold(idev); 608 /* For caller */ 609 in6_ifa_hold(ifa); 610 611 /* Add to big hash table */ 612 hash = ipv6_addr_hash(addr); 613 614 ifa->lst_next = inet6_addr_lst[hash]; 615 inet6_addr_lst[hash] = ifa; 616 in6_ifa_hold(ifa); 617 write_unlock(&addrconf_hash_lock); 618 619 write_lock(&idev->lock); 620 /* Add to inet6_dev unicast addr list. */ 621 ipv6_link_dev_addr(idev, ifa); 622 623 #ifdef CONFIG_IPV6_PRIVACY 624 if (ifa->flags&IFA_F_TEMPORARY) { 625 ifa->tmp_next = idev->tempaddr_list; 626 idev->tempaddr_list = ifa; 627 in6_ifa_hold(ifa); 628 } 629 #endif 630 631 in6_ifa_hold(ifa); 632 write_unlock(&idev->lock); 633 out2: 634 rcu_read_unlock_bh(); 635 636 if (likely(err == 0)) 637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 638 else { 639 kfree(ifa); 640 ifa = ERR_PTR(err); 641 } 642 643 return ifa; 644 out: 645 write_unlock(&addrconf_hash_lock); 646 goto out2; 647 } 648 649 /* This function wants to get referenced ifp and releases it before return */ 650 651 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 652 { 653 struct inet6_ifaddr *ifa, **ifap; 654 struct inet6_dev *idev = ifp->idev; 655 int hash; 656 int deleted = 0, onlink = 0; 657 unsigned long expires = jiffies; 658 659 hash = ipv6_addr_hash(&ifp->addr); 660 661 ifp->dead = 1; 662 663 write_lock_bh(&addrconf_hash_lock); 664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 665 ifap = &ifa->lst_next) { 666 if (ifa == ifp) { 667 *ifap = ifa->lst_next; 668 __in6_ifa_put(ifp); 669 ifa->lst_next = NULL; 670 break; 671 } 672 } 673 write_unlock_bh(&addrconf_hash_lock); 674 675 write_lock_bh(&idev->lock); 676 #ifdef CONFIG_IPV6_PRIVACY 677 if (ifp->flags&IFA_F_TEMPORARY) { 678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 679 ifap = &ifa->tmp_next) { 680 if (ifa == ifp) { 681 *ifap = ifa->tmp_next; 682 if (ifp->ifpub) { 683 in6_ifa_put(ifp->ifpub); 684 ifp->ifpub = NULL; 685 } 686 __in6_ifa_put(ifp); 687 ifa->tmp_next = NULL; 688 break; 689 } 690 } 691 } 692 #endif 693 694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 695 if (ifa == ifp) { 696 *ifap = ifa->if_next; 697 __in6_ifa_put(ifp); 698 ifa->if_next = NULL; 699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 700 break; 701 deleted = 1; 702 continue; 703 } else if (ifp->flags & IFA_F_PERMANENT) { 704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 705 ifp->prefix_len)) { 706 if (ifa->flags & IFA_F_PERMANENT) { 707 onlink = 1; 708 if (deleted) 709 break; 710 } else { 711 unsigned long lifetime; 712 713 if (!onlink) 714 onlink = -1; 715 716 spin_lock(&ifa->lock); 717 lifetime = min_t(unsigned long, 718 ifa->valid_lft, 0x7fffffffUL/HZ); 719 if (time_before(expires, 720 ifa->tstamp + lifetime * HZ)) 721 expires = ifa->tstamp + lifetime * HZ; 722 spin_unlock(&ifa->lock); 723 } 724 } 725 } 726 ifap = &ifa->if_next; 727 } 728 write_unlock_bh(&idev->lock); 729 730 ipv6_ifa_notify(RTM_DELADDR, ifp); 731 732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 733 734 addrconf_del_timer(ifp); 735 736 /* 737 * Purge or update corresponding prefix 738 * 739 * 1) we don't purge prefix here if address was not permanent. 740 * prefix is managed by its own lifetime. 741 * 2) if there're no addresses, delete prefix. 742 * 3) if there're still other permanent address(es), 743 * corresponding prefix is still permanent. 744 * 4) otherwise, update prefix lifetime to the 745 * longest valid lifetime among the corresponding 746 * addresses on the device. 747 * Note: subsequent RA will update lifetime. 748 * 749 * --yoshfuji 750 */ 751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 752 struct in6_addr prefix; 753 struct rt6_info *rt; 754 755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 756 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 757 758 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 759 if (onlink == 0) { 760 ip6_del_rt(rt); 761 rt = NULL; 762 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 763 rt->rt6i_expires = expires; 764 rt->rt6i_flags |= RTF_EXPIRES; 765 } 766 } 767 dst_release(&rt->u.dst); 768 } 769 770 in6_ifa_put(ifp); 771 } 772 773 #ifdef CONFIG_IPV6_PRIVACY 774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 775 { 776 struct inet6_dev *idev = ifp->idev; 777 struct in6_addr addr, *tmpaddr; 778 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 779 int tmp_plen; 780 int ret = 0; 781 int max_addresses; 782 u32 addr_flags; 783 784 write_lock(&idev->lock); 785 if (ift) { 786 spin_lock_bh(&ift->lock); 787 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 788 spin_unlock_bh(&ift->lock); 789 tmpaddr = &addr; 790 } else { 791 tmpaddr = NULL; 792 } 793 retry: 794 in6_dev_hold(idev); 795 if (idev->cnf.use_tempaddr <= 0) { 796 write_unlock(&idev->lock); 797 printk(KERN_INFO 798 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 799 in6_dev_put(idev); 800 ret = -1; 801 goto out; 802 } 803 spin_lock_bh(&ifp->lock); 804 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 805 idev->cnf.use_tempaddr = -1; /*XXX*/ 806 spin_unlock_bh(&ifp->lock); 807 write_unlock(&idev->lock); 808 printk(KERN_WARNING 809 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 810 in6_dev_put(idev); 811 ret = -1; 812 goto out; 813 } 814 in6_ifa_hold(ifp); 815 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 816 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 817 spin_unlock_bh(&ifp->lock); 818 write_unlock(&idev->lock); 819 printk(KERN_WARNING 820 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 821 in6_ifa_put(ifp); 822 in6_dev_put(idev); 823 ret = -1; 824 goto out; 825 } 826 memcpy(&addr.s6_addr[8], idev->rndid, 8); 827 tmp_valid_lft = min_t(__u32, 828 ifp->valid_lft, 829 idev->cnf.temp_valid_lft); 830 tmp_prefered_lft = min_t(__u32, 831 ifp->prefered_lft, 832 idev->cnf.temp_prefered_lft - desync_factor / HZ); 833 tmp_plen = ifp->prefix_len; 834 max_addresses = idev->cnf.max_addresses; 835 tmp_cstamp = ifp->cstamp; 836 tmp_tstamp = ifp->tstamp; 837 spin_unlock_bh(&ifp->lock); 838 839 write_unlock(&idev->lock); 840 841 addr_flags = IFA_F_TEMPORARY; 842 /* set in addrconf_prefix_rcv() */ 843 if (ifp->flags & IFA_F_OPTIMISTIC) 844 addr_flags |= IFA_F_OPTIMISTIC; 845 846 ift = !max_addresses || 847 ipv6_count_addresses(idev) < max_addresses ? 848 ipv6_add_addr(idev, &addr, tmp_plen, 849 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 850 addr_flags) : NULL; 851 if (!ift || IS_ERR(ift)) { 852 in6_ifa_put(ifp); 853 in6_dev_put(idev); 854 printk(KERN_INFO 855 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 856 tmpaddr = &addr; 857 write_lock(&idev->lock); 858 goto retry; 859 } 860 861 spin_lock_bh(&ift->lock); 862 ift->ifpub = ifp; 863 ift->valid_lft = tmp_valid_lft; 864 ift->prefered_lft = tmp_prefered_lft; 865 ift->cstamp = tmp_cstamp; 866 ift->tstamp = tmp_tstamp; 867 spin_unlock_bh(&ift->lock); 868 869 addrconf_dad_start(ift, 0); 870 in6_ifa_put(ift); 871 in6_dev_put(idev); 872 out: 873 return ret; 874 } 875 #endif 876 877 /* 878 * Choose an appropriate source address (RFC3484) 879 */ 880 struct ipv6_saddr_score { 881 int addr_type; 882 unsigned int attrs; 883 int matchlen; 884 int scope; 885 unsigned int rule; 886 }; 887 888 #define IPV6_SADDR_SCORE_LOCAL 0x0001 889 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 890 #define IPV6_SADDR_SCORE_HOA 0x0008 891 #define IPV6_SADDR_SCORE_OIF 0x0010 892 #define IPV6_SADDR_SCORE_LABEL 0x0020 893 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 894 895 static inline int ipv6_saddr_preferred(int type) 896 { 897 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 898 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 899 return 1; 900 return 0; 901 } 902 903 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 904 struct in6_addr *daddr, struct in6_addr *saddr) 905 { 906 struct ipv6_saddr_score hiscore; 907 struct inet6_ifaddr *ifa_result = NULL; 908 int daddr_type = __ipv6_addr_type(daddr); 909 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 910 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0; 911 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex); 912 struct net_device *dev; 913 914 memset(&hiscore, 0, sizeof(hiscore)); 915 916 read_lock(&dev_base_lock); 917 rcu_read_lock(); 918 919 for_each_netdev(&init_net, dev) { 920 struct inet6_dev *idev; 921 struct inet6_ifaddr *ifa; 922 923 /* Rule 0: Candidate Source Address (section 4) 924 * - multicast and link-local destination address, 925 * the set of candidate source address MUST only 926 * include addresses assigned to interfaces 927 * belonging to the same link as the outgoing 928 * interface. 929 * (- For site-local destination addresses, the 930 * set of candidate source addresses MUST only 931 * include addresses assigned to interfaces 932 * belonging to the same site as the outgoing 933 * interface.) 934 */ 935 if ((daddr_type & IPV6_ADDR_MULTICAST || 936 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 937 daddr_dev && dev != daddr_dev) 938 continue; 939 940 idev = __in6_dev_get(dev); 941 if (!idev) 942 continue; 943 944 read_lock_bh(&idev->lock); 945 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 946 struct ipv6_saddr_score score; 947 948 score.addr_type = __ipv6_addr_type(&ifa->addr); 949 950 /* Rule 0: 951 * - Tentative Address (RFC2462 section 5.4) 952 * - A tentative address is not considered 953 * "assigned to an interface" in the traditional 954 * sense, unless it is also flagged as optimistic. 955 * - Candidate Source Address (section 4) 956 * - In any case, anycast addresses, multicast 957 * addresses, and the unspecified address MUST 958 * NOT be included in a candidate set. 959 */ 960 if ((ifa->flags & IFA_F_TENTATIVE) && 961 (!(ifa->flags & IFA_F_OPTIMISTIC))) 962 continue; 963 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 964 score.addr_type & IPV6_ADDR_MULTICAST)) { 965 LIMIT_NETDEBUG(KERN_DEBUG 966 "ADDRCONF: unspecified / multicast address " 967 "assigned as unicast address on %s", 968 dev->name); 969 continue; 970 } 971 972 score.attrs = 0; 973 score.matchlen = 0; 974 score.scope = 0; 975 score.rule = 0; 976 977 if (ifa_result == NULL) { 978 /* record it if the first available entry */ 979 goto record_it; 980 } 981 982 /* Rule 1: Prefer same address */ 983 if (hiscore.rule < 1) { 984 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 985 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 986 hiscore.rule++; 987 } 988 if (ipv6_addr_equal(&ifa->addr, daddr)) { 989 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 990 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 991 score.rule = 1; 992 goto record_it; 993 } 994 } else { 995 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 996 continue; 997 } 998 999 /* Rule 2: Prefer appropriate scope */ 1000 if (hiscore.rule < 2) { 1001 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 1002 hiscore.rule++; 1003 } 1004 score.scope = __ipv6_addr_src_scope(score.addr_type); 1005 if (hiscore.scope < score.scope) { 1006 if (hiscore.scope < daddr_scope) { 1007 score.rule = 2; 1008 goto record_it; 1009 } else 1010 continue; 1011 } else if (score.scope < hiscore.scope) { 1012 if (score.scope < daddr_scope) 1013 break; /* addresses sorted by scope */ 1014 else { 1015 score.rule = 2; 1016 goto record_it; 1017 } 1018 } 1019 1020 /* Rule 3: Avoid deprecated and optimistic addresses */ 1021 if (hiscore.rule < 3) { 1022 if (ipv6_saddr_preferred(hiscore.addr_type) || 1023 (((ifa_result->flags & 1024 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) 1025 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1026 hiscore.rule++; 1027 } 1028 if (ipv6_saddr_preferred(score.addr_type) || 1029 (((ifa->flags & 1030 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) { 1031 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1032 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 1033 score.rule = 3; 1034 goto record_it; 1035 } 1036 } else { 1037 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 1038 continue; 1039 } 1040 1041 /* Rule 4: Prefer home address */ 1042 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 1043 if (hiscore.rule < 4) { 1044 if (ifa_result->flags & IFA_F_HOMEADDRESS) 1045 hiscore.attrs |= IPV6_SADDR_SCORE_HOA; 1046 hiscore.rule++; 1047 } 1048 if (ifa->flags & IFA_F_HOMEADDRESS) { 1049 score.attrs |= IPV6_SADDR_SCORE_HOA; 1050 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) { 1051 score.rule = 4; 1052 goto record_it; 1053 } 1054 } else { 1055 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA) 1056 continue; 1057 } 1058 #else 1059 if (hiscore.rule < 4) 1060 hiscore.rule++; 1061 #endif 1062 1063 /* Rule 5: Prefer outgoing interface */ 1064 if (hiscore.rule < 5) { 1065 if (daddr_dev == NULL || 1066 daddr_dev == ifa_result->idev->dev) 1067 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1068 hiscore.rule++; 1069 } 1070 if (daddr_dev == NULL || 1071 daddr_dev == ifa->idev->dev) { 1072 score.attrs |= IPV6_SADDR_SCORE_OIF; 1073 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1074 score.rule = 5; 1075 goto record_it; 1076 } 1077 } else { 1078 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1079 continue; 1080 } 1081 1082 /* Rule 6: Prefer matching label */ 1083 if (hiscore.rule < 6) { 1084 if (ipv6_addr_label(&ifa_result->addr, 1085 hiscore.addr_type, 1086 ifa_result->idev->dev->ifindex) == daddr_label) 1087 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1088 hiscore.rule++; 1089 } 1090 if (ipv6_addr_label(&ifa->addr, 1091 score.addr_type, 1092 ifa->idev->dev->ifindex) == daddr_label) { 1093 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1094 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1095 score.rule = 6; 1096 goto record_it; 1097 } 1098 } else { 1099 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1100 continue; 1101 } 1102 1103 #ifdef CONFIG_IPV6_PRIVACY 1104 /* Rule 7: Prefer public address 1105 * Note: prefer temprary address if use_tempaddr >= 2 1106 */ 1107 if (hiscore.rule < 7) { 1108 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1109 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1110 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1111 hiscore.rule++; 1112 } 1113 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1114 (ifa->idev->cnf.use_tempaddr >= 2)) { 1115 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1116 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1117 score.rule = 7; 1118 goto record_it; 1119 } 1120 } else { 1121 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1122 continue; 1123 } 1124 #else 1125 if (hiscore.rule < 7) 1126 hiscore.rule++; 1127 #endif 1128 /* Rule 8: Use longest matching prefix */ 1129 if (hiscore.rule < 8) { 1130 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1131 hiscore.rule++; 1132 } 1133 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1134 if (score.matchlen > hiscore.matchlen) { 1135 score.rule = 8; 1136 goto record_it; 1137 } 1138 #if 0 1139 else if (score.matchlen < hiscore.matchlen) 1140 continue; 1141 #endif 1142 1143 /* Final Rule: choose first available one */ 1144 continue; 1145 record_it: 1146 if (ifa_result) 1147 in6_ifa_put(ifa_result); 1148 in6_ifa_hold(ifa); 1149 ifa_result = ifa; 1150 hiscore = score; 1151 } 1152 read_unlock_bh(&idev->lock); 1153 } 1154 rcu_read_unlock(); 1155 read_unlock(&dev_base_lock); 1156 1157 if (!ifa_result) 1158 return -EADDRNOTAVAIL; 1159 1160 ipv6_addr_copy(saddr, &ifa_result->addr); 1161 in6_ifa_put(ifa_result); 1162 return 0; 1163 } 1164 1165 1166 int ipv6_get_saddr(struct dst_entry *dst, 1167 struct in6_addr *daddr, struct in6_addr *saddr) 1168 { 1169 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr); 1170 } 1171 1172 EXPORT_SYMBOL(ipv6_get_saddr); 1173 1174 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1175 unsigned char banned_flags) 1176 { 1177 struct inet6_dev *idev; 1178 int err = -EADDRNOTAVAIL; 1179 1180 rcu_read_lock(); 1181 if ((idev = __in6_dev_get(dev)) != NULL) { 1182 struct inet6_ifaddr *ifp; 1183 1184 read_lock_bh(&idev->lock); 1185 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1186 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1187 ipv6_addr_copy(addr, &ifp->addr); 1188 err = 0; 1189 break; 1190 } 1191 } 1192 read_unlock_bh(&idev->lock); 1193 } 1194 rcu_read_unlock(); 1195 return err; 1196 } 1197 1198 static int ipv6_count_addresses(struct inet6_dev *idev) 1199 { 1200 int cnt = 0; 1201 struct inet6_ifaddr *ifp; 1202 1203 read_lock_bh(&idev->lock); 1204 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1205 cnt++; 1206 read_unlock_bh(&idev->lock); 1207 return cnt; 1208 } 1209 1210 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1211 struct net_device *dev, int strict) 1212 { 1213 struct inet6_ifaddr * ifp; 1214 u8 hash = ipv6_addr_hash(addr); 1215 1216 read_lock_bh(&addrconf_hash_lock); 1217 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1218 if (ifp->idev->dev->nd_net != net) 1219 continue; 1220 if (ipv6_addr_equal(&ifp->addr, addr) && 1221 !(ifp->flags&IFA_F_TENTATIVE)) { 1222 if (dev == NULL || ifp->idev->dev == dev || 1223 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1224 break; 1225 } 1226 } 1227 read_unlock_bh(&addrconf_hash_lock); 1228 return ifp != NULL; 1229 } 1230 EXPORT_SYMBOL(ipv6_chk_addr); 1231 1232 static 1233 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1234 struct net_device *dev) 1235 { 1236 struct inet6_ifaddr * ifp; 1237 u8 hash = ipv6_addr_hash(addr); 1238 1239 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1240 if (ifp->idev->dev->nd_net != net) 1241 continue; 1242 if (ipv6_addr_equal(&ifp->addr, addr)) { 1243 if (dev == NULL || ifp->idev->dev == dev) 1244 break; 1245 } 1246 } 1247 return ifp != NULL; 1248 } 1249 1250 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr, 1251 struct net_device *dev, int strict) 1252 { 1253 struct inet6_ifaddr * ifp; 1254 u8 hash = ipv6_addr_hash(addr); 1255 1256 read_lock_bh(&addrconf_hash_lock); 1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1258 if (ifp->idev->dev->nd_net != net) 1259 continue; 1260 if (ipv6_addr_equal(&ifp->addr, addr)) { 1261 if (dev == NULL || ifp->idev->dev == dev || 1262 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1263 in6_ifa_hold(ifp); 1264 break; 1265 } 1266 } 1267 } 1268 read_unlock_bh(&addrconf_hash_lock); 1269 1270 return ifp; 1271 } 1272 1273 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1274 { 1275 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1276 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1277 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1278 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1279 int sk_ipv6only = ipv6_only_sock(sk); 1280 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1281 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1282 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1283 1284 if (!sk2_rcv_saddr && !sk_ipv6only) 1285 return 1; 1286 1287 if (addr_type2 == IPV6_ADDR_ANY && 1288 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1289 return 1; 1290 1291 if (addr_type == IPV6_ADDR_ANY && 1292 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1293 return 1; 1294 1295 if (sk2_rcv_saddr6 && 1296 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1297 return 1; 1298 1299 if (addr_type == IPV6_ADDR_MAPPED && 1300 !sk2_ipv6only && 1301 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1302 return 1; 1303 1304 return 0; 1305 } 1306 1307 /* Gets referenced address, destroys ifaddr */ 1308 1309 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1310 { 1311 if (ifp->flags&IFA_F_PERMANENT) { 1312 spin_lock_bh(&ifp->lock); 1313 addrconf_del_timer(ifp); 1314 ifp->flags |= IFA_F_TENTATIVE; 1315 spin_unlock_bh(&ifp->lock); 1316 in6_ifa_put(ifp); 1317 #ifdef CONFIG_IPV6_PRIVACY 1318 } else if (ifp->flags&IFA_F_TEMPORARY) { 1319 struct inet6_ifaddr *ifpub; 1320 spin_lock_bh(&ifp->lock); 1321 ifpub = ifp->ifpub; 1322 if (ifpub) { 1323 in6_ifa_hold(ifpub); 1324 spin_unlock_bh(&ifp->lock); 1325 ipv6_create_tempaddr(ifpub, ifp); 1326 in6_ifa_put(ifpub); 1327 } else { 1328 spin_unlock_bh(&ifp->lock); 1329 } 1330 ipv6_del_addr(ifp); 1331 #endif 1332 } else 1333 ipv6_del_addr(ifp); 1334 } 1335 1336 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1337 { 1338 if (net_ratelimit()) 1339 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1340 addrconf_dad_stop(ifp); 1341 } 1342 1343 /* Join to solicited addr multicast group. */ 1344 1345 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1346 { 1347 struct in6_addr maddr; 1348 1349 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1350 return; 1351 1352 addrconf_addr_solict_mult(addr, &maddr); 1353 ipv6_dev_mc_inc(dev, &maddr); 1354 } 1355 1356 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1357 { 1358 struct in6_addr maddr; 1359 1360 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1361 return; 1362 1363 addrconf_addr_solict_mult(addr, &maddr); 1364 __ipv6_dev_mc_dec(idev, &maddr); 1365 } 1366 1367 static void addrconf_join_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_inc(ifp->idev->dev, &addr); 1374 } 1375 1376 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1377 { 1378 struct in6_addr addr; 1379 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1380 if (ipv6_addr_any(&addr)) 1381 return; 1382 __ipv6_dev_ac_dec(ifp->idev, &addr); 1383 } 1384 1385 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1386 { 1387 if (dev->addr_len != ETH_ALEN) 1388 return -1; 1389 memcpy(eui, dev->dev_addr, 3); 1390 memcpy(eui + 5, dev->dev_addr + 3, 3); 1391 1392 /* 1393 * The zSeries OSA network cards can be shared among various 1394 * OS instances, but the OSA cards have only one MAC address. 1395 * This leads to duplicate address conflicts in conjunction 1396 * with IPv6 if more than one instance uses the same card. 1397 * 1398 * The driver for these cards can deliver a unique 16-bit 1399 * identifier for each instance sharing the same card. It is 1400 * placed instead of 0xFFFE in the interface identifier. The 1401 * "u" bit of the interface identifier is not inverted in this 1402 * case. Hence the resulting interface identifier has local 1403 * scope according to RFC2373. 1404 */ 1405 if (dev->dev_id) { 1406 eui[3] = (dev->dev_id >> 8) & 0xFF; 1407 eui[4] = dev->dev_id & 0xFF; 1408 } else { 1409 eui[3] = 0xFF; 1410 eui[4] = 0xFE; 1411 eui[0] ^= 2; 1412 } 1413 return 0; 1414 } 1415 1416 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1417 { 1418 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1419 if (dev->addr_len != ARCNET_ALEN) 1420 return -1; 1421 memset(eui, 0, 7); 1422 eui[7] = *(u8*)dev->dev_addr; 1423 return 0; 1424 } 1425 1426 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1427 { 1428 if (dev->addr_len != INFINIBAND_ALEN) 1429 return -1; 1430 memcpy(eui, dev->dev_addr + 12, 8); 1431 eui[0] |= 2; 1432 return 0; 1433 } 1434 1435 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1436 { 1437 switch (dev->type) { 1438 case ARPHRD_ETHER: 1439 case ARPHRD_FDDI: 1440 case ARPHRD_IEEE802_TR: 1441 return addrconf_ifid_eui48(eui, dev); 1442 case ARPHRD_ARCNET: 1443 return addrconf_ifid_arcnet(eui, dev); 1444 case ARPHRD_INFINIBAND: 1445 return addrconf_ifid_infiniband(eui, dev); 1446 case ARPHRD_SIT: 1447 if (dev->priv_flags & IFF_ISATAP) 1448 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr); 1449 } 1450 return -1; 1451 } 1452 1453 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1454 { 1455 int err = -1; 1456 struct inet6_ifaddr *ifp; 1457 1458 read_lock_bh(&idev->lock); 1459 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1460 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1461 memcpy(eui, ifp->addr.s6_addr+8, 8); 1462 err = 0; 1463 break; 1464 } 1465 } 1466 read_unlock_bh(&idev->lock); 1467 return err; 1468 } 1469 1470 #ifdef CONFIG_IPV6_PRIVACY 1471 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1472 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1473 { 1474 regen: 1475 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1476 idev->rndid[0] &= ~0x02; 1477 1478 /* 1479 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1480 * check if generated address is not inappropriate 1481 * 1482 * - Reserved subnet anycast (RFC 2526) 1483 * 11111101 11....11 1xxxxxxx 1484 * - ISATAP (RFC4214) 6.1 1485 * 00-00-5E-FE-xx-xx-xx-xx 1486 * - value 0 1487 * - XXX: already assigned to an address on the device 1488 */ 1489 if (idev->rndid[0] == 0xfd && 1490 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1491 (idev->rndid[7]&0x80)) 1492 goto regen; 1493 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1494 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1495 goto regen; 1496 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1497 goto regen; 1498 } 1499 1500 return 0; 1501 } 1502 1503 static void ipv6_regen_rndid(unsigned long data) 1504 { 1505 struct inet6_dev *idev = (struct inet6_dev *) data; 1506 unsigned long expires; 1507 1508 rcu_read_lock_bh(); 1509 write_lock_bh(&idev->lock); 1510 1511 if (idev->dead) 1512 goto out; 1513 1514 if (__ipv6_regen_rndid(idev) < 0) 1515 goto out; 1516 1517 expires = jiffies + 1518 idev->cnf.temp_prefered_lft * HZ - 1519 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1520 if (time_before(expires, jiffies)) { 1521 printk(KERN_WARNING 1522 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1523 idev->dev->name); 1524 goto out; 1525 } 1526 1527 if (!mod_timer(&idev->regen_timer, expires)) 1528 in6_dev_hold(idev); 1529 1530 out: 1531 write_unlock_bh(&idev->lock); 1532 rcu_read_unlock_bh(); 1533 in6_dev_put(idev); 1534 } 1535 1536 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1537 int ret = 0; 1538 1539 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1540 ret = __ipv6_regen_rndid(idev); 1541 return ret; 1542 } 1543 #endif 1544 1545 /* 1546 * Add prefix route. 1547 */ 1548 1549 static void 1550 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1551 unsigned long expires, u32 flags) 1552 { 1553 struct fib6_config cfg = { 1554 .fc_table = RT6_TABLE_PREFIX, 1555 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1556 .fc_ifindex = dev->ifindex, 1557 .fc_expires = expires, 1558 .fc_dst_len = plen, 1559 .fc_flags = RTF_UP | flags, 1560 }; 1561 1562 ipv6_addr_copy(&cfg.fc_dst, pfx); 1563 1564 /* Prevent useless cloning on PtP SIT. 1565 This thing is done here expecting that the whole 1566 class of non-broadcast devices need not cloning. 1567 */ 1568 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1569 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1570 cfg.fc_flags |= RTF_NONEXTHOP; 1571 #endif 1572 1573 ip6_route_add(&cfg); 1574 } 1575 1576 /* Create "default" multicast route to the interface */ 1577 1578 static void addrconf_add_mroute(struct net_device *dev) 1579 { 1580 struct fib6_config cfg = { 1581 .fc_table = RT6_TABLE_LOCAL, 1582 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1583 .fc_ifindex = dev->ifindex, 1584 .fc_dst_len = 8, 1585 .fc_flags = RTF_UP, 1586 }; 1587 1588 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1589 1590 ip6_route_add(&cfg); 1591 } 1592 1593 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1594 static void sit_route_add(struct net_device *dev) 1595 { 1596 struct fib6_config cfg = { 1597 .fc_table = RT6_TABLE_MAIN, 1598 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1599 .fc_ifindex = dev->ifindex, 1600 .fc_dst_len = 96, 1601 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1602 }; 1603 1604 /* prefix length - 96 bits "::d.d.d.d" */ 1605 ip6_route_add(&cfg); 1606 } 1607 #endif 1608 1609 static void addrconf_add_lroute(struct net_device *dev) 1610 { 1611 struct in6_addr addr; 1612 1613 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1614 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1615 } 1616 1617 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1618 { 1619 struct inet6_dev *idev; 1620 1621 ASSERT_RTNL(); 1622 1623 if ((idev = ipv6_find_idev(dev)) == NULL) 1624 return NULL; 1625 1626 /* Add default multicast route */ 1627 addrconf_add_mroute(dev); 1628 1629 /* Add link local route */ 1630 addrconf_add_lroute(dev); 1631 return idev; 1632 } 1633 1634 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1635 { 1636 struct prefix_info *pinfo; 1637 __u32 valid_lft; 1638 __u32 prefered_lft; 1639 int addr_type; 1640 unsigned long rt_expires; 1641 struct inet6_dev *in6_dev; 1642 1643 pinfo = (struct prefix_info *) opt; 1644 1645 if (len < sizeof(struct prefix_info)) { 1646 ADBG(("addrconf: prefix option too short\n")); 1647 return; 1648 } 1649 1650 /* 1651 * Validation checks ([ADDRCONF], page 19) 1652 */ 1653 1654 addr_type = ipv6_addr_type(&pinfo->prefix); 1655 1656 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1657 return; 1658 1659 valid_lft = ntohl(pinfo->valid); 1660 prefered_lft = ntohl(pinfo->prefered); 1661 1662 if (prefered_lft > valid_lft) { 1663 if (net_ratelimit()) 1664 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1665 return; 1666 } 1667 1668 in6_dev = in6_dev_get(dev); 1669 1670 if (in6_dev == NULL) { 1671 if (net_ratelimit()) 1672 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1673 return; 1674 } 1675 1676 /* 1677 * Two things going on here: 1678 * 1) Add routes for on-link prefixes 1679 * 2) Configure prefixes with the auto flag set 1680 */ 1681 1682 /* Avoid arithmetic overflow. Really, we could 1683 save rt_expires in seconds, likely valid_lft, 1684 but it would require division in fib gc, that it 1685 not good. 1686 */ 1687 if (valid_lft >= 0x7FFFFFFF/HZ) 1688 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1689 else 1690 rt_expires = valid_lft * HZ; 1691 1692 /* 1693 * We convert this (in jiffies) to clock_t later. 1694 * Avoid arithmetic overflow there as well. 1695 * Overflow can happen only if HZ < USER_HZ. 1696 */ 1697 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1698 rt_expires = 0x7FFFFFFF / USER_HZ; 1699 1700 if (pinfo->onlink) { 1701 struct rt6_info *rt; 1702 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1703 1704 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1705 if (rt->rt6i_flags&RTF_EXPIRES) { 1706 if (valid_lft == 0) { 1707 ip6_del_rt(rt); 1708 rt = NULL; 1709 } else { 1710 rt->rt6i_expires = jiffies + rt_expires; 1711 } 1712 } 1713 } else if (valid_lft) { 1714 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1715 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1716 } 1717 if (rt) 1718 dst_release(&rt->u.dst); 1719 } 1720 1721 /* Try to figure out our local address for this prefix */ 1722 1723 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1724 struct inet6_ifaddr * ifp; 1725 struct in6_addr addr; 1726 int create = 0, update_lft = 0; 1727 1728 if (pinfo->prefix_len == 64) { 1729 memcpy(&addr, &pinfo->prefix, 8); 1730 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1731 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1732 in6_dev_put(in6_dev); 1733 return; 1734 } 1735 goto ok; 1736 } 1737 if (net_ratelimit()) 1738 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1739 pinfo->prefix_len); 1740 in6_dev_put(in6_dev); 1741 return; 1742 1743 ok: 1744 1745 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1); 1746 1747 if (ifp == NULL && valid_lft) { 1748 int max_addresses = in6_dev->cnf.max_addresses; 1749 u32 addr_flags = 0; 1750 1751 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1752 if (in6_dev->cnf.optimistic_dad && 1753 !ipv6_devconf.forwarding) 1754 addr_flags = IFA_F_OPTIMISTIC; 1755 #endif 1756 1757 /* Do not allow to create too much of autoconfigured 1758 * addresses; this would be too easy way to crash kernel. 1759 */ 1760 if (!max_addresses || 1761 ipv6_count_addresses(in6_dev) < max_addresses) 1762 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1763 addr_type&IPV6_ADDR_SCOPE_MASK, 1764 addr_flags); 1765 1766 if (!ifp || IS_ERR(ifp)) { 1767 in6_dev_put(in6_dev); 1768 return; 1769 } 1770 1771 update_lft = create = 1; 1772 ifp->cstamp = jiffies; 1773 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1774 } 1775 1776 if (ifp) { 1777 int flags; 1778 unsigned long now; 1779 #ifdef CONFIG_IPV6_PRIVACY 1780 struct inet6_ifaddr *ift; 1781 #endif 1782 u32 stored_lft; 1783 1784 /* update lifetime (RFC2462 5.5.3 e) */ 1785 spin_lock(&ifp->lock); 1786 now = jiffies; 1787 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1788 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1789 else 1790 stored_lft = 0; 1791 if (!update_lft && stored_lft) { 1792 if (valid_lft > MIN_VALID_LIFETIME || 1793 valid_lft > stored_lft) 1794 update_lft = 1; 1795 else if (stored_lft <= MIN_VALID_LIFETIME) { 1796 /* valid_lft <= stored_lft is always true */ 1797 /* XXX: IPsec */ 1798 update_lft = 0; 1799 } else { 1800 valid_lft = MIN_VALID_LIFETIME; 1801 if (valid_lft < prefered_lft) 1802 prefered_lft = valid_lft; 1803 update_lft = 1; 1804 } 1805 } 1806 1807 if (update_lft) { 1808 ifp->valid_lft = valid_lft; 1809 ifp->prefered_lft = prefered_lft; 1810 ifp->tstamp = now; 1811 flags = ifp->flags; 1812 ifp->flags &= ~IFA_F_DEPRECATED; 1813 spin_unlock(&ifp->lock); 1814 1815 if (!(flags&IFA_F_TENTATIVE)) 1816 ipv6_ifa_notify(0, ifp); 1817 } else 1818 spin_unlock(&ifp->lock); 1819 1820 #ifdef CONFIG_IPV6_PRIVACY 1821 read_lock_bh(&in6_dev->lock); 1822 /* update all temporary addresses in the list */ 1823 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1824 /* 1825 * When adjusting the lifetimes of an existing 1826 * temporary address, only lower the lifetimes. 1827 * Implementations must not increase the 1828 * lifetimes of an existing temporary address 1829 * when processing a Prefix Information Option. 1830 */ 1831 spin_lock(&ift->lock); 1832 flags = ift->flags; 1833 if (ift->valid_lft > valid_lft && 1834 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1835 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1836 if (ift->prefered_lft > prefered_lft && 1837 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1838 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1839 spin_unlock(&ift->lock); 1840 if (!(flags&IFA_F_TENTATIVE)) 1841 ipv6_ifa_notify(0, ift); 1842 } 1843 1844 if (create && in6_dev->cnf.use_tempaddr > 0) { 1845 /* 1846 * When a new public address is created as described in [ADDRCONF], 1847 * also create a new temporary address. 1848 */ 1849 read_unlock_bh(&in6_dev->lock); 1850 ipv6_create_tempaddr(ifp, NULL); 1851 } else { 1852 read_unlock_bh(&in6_dev->lock); 1853 } 1854 #endif 1855 in6_ifa_put(ifp); 1856 addrconf_verify(0); 1857 } 1858 } 1859 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1860 in6_dev_put(in6_dev); 1861 } 1862 1863 /* 1864 * Set destination address. 1865 * Special case for SIT interfaces where we create a new "virtual" 1866 * device. 1867 */ 1868 int addrconf_set_dstaddr(void __user *arg) 1869 { 1870 struct in6_ifreq ireq; 1871 struct net_device *dev; 1872 int err = -EINVAL; 1873 1874 rtnl_lock(); 1875 1876 err = -EFAULT; 1877 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1878 goto err_exit; 1879 1880 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex); 1881 1882 err = -ENODEV; 1883 if (dev == NULL) 1884 goto err_exit; 1885 1886 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1887 if (dev->type == ARPHRD_SIT) { 1888 struct ifreq ifr; 1889 mm_segment_t oldfs; 1890 struct ip_tunnel_parm p; 1891 1892 err = -EADDRNOTAVAIL; 1893 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1894 goto err_exit; 1895 1896 memset(&p, 0, sizeof(p)); 1897 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1898 p.iph.saddr = 0; 1899 p.iph.version = 4; 1900 p.iph.ihl = 5; 1901 p.iph.protocol = IPPROTO_IPV6; 1902 p.iph.ttl = 64; 1903 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 1904 1905 oldfs = get_fs(); set_fs(KERNEL_DS); 1906 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1907 set_fs(oldfs); 1908 1909 if (err == 0) { 1910 err = -ENOBUFS; 1911 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL) 1912 goto err_exit; 1913 err = dev_open(dev); 1914 } 1915 } 1916 #endif 1917 1918 err_exit: 1919 rtnl_unlock(); 1920 return err; 1921 } 1922 1923 /* 1924 * Manual configuration of address on an interface 1925 */ 1926 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1927 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft) 1928 { 1929 struct inet6_ifaddr *ifp; 1930 struct inet6_dev *idev; 1931 struct net_device *dev; 1932 int scope; 1933 u32 flags = RTF_EXPIRES; 1934 1935 ASSERT_RTNL(); 1936 1937 /* check the lifetime */ 1938 if (!valid_lft || prefered_lft > valid_lft) 1939 return -EINVAL; 1940 1941 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL) 1942 return -ENODEV; 1943 1944 if ((idev = addrconf_add_dev(dev)) == NULL) 1945 return -ENOBUFS; 1946 1947 scope = ipv6_addr_scope(pfx); 1948 1949 if (valid_lft == INFINITY_LIFE_TIME) { 1950 ifa_flags |= IFA_F_PERMANENT; 1951 flags = 0; 1952 } else if (valid_lft >= 0x7FFFFFFF/HZ) 1953 valid_lft = 0x7FFFFFFF/HZ; 1954 1955 if (prefered_lft == 0) 1956 ifa_flags |= IFA_F_DEPRECATED; 1957 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1958 (prefered_lft != INFINITY_LIFE_TIME)) 1959 prefered_lft = 0x7FFFFFFF/HZ; 1960 1961 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1962 1963 if (!IS_ERR(ifp)) { 1964 spin_lock_bh(&ifp->lock); 1965 ifp->valid_lft = valid_lft; 1966 ifp->prefered_lft = prefered_lft; 1967 ifp->tstamp = jiffies; 1968 spin_unlock_bh(&ifp->lock); 1969 1970 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 1971 jiffies_to_clock_t(valid_lft * HZ), flags); 1972 /* 1973 * Note that section 3.1 of RFC 4429 indicates 1974 * that the Optimistic flag should not be set for 1975 * manually configured addresses 1976 */ 1977 addrconf_dad_start(ifp, 0); 1978 in6_ifa_put(ifp); 1979 addrconf_verify(0); 1980 return 0; 1981 } 1982 1983 return PTR_ERR(ifp); 1984 } 1985 1986 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1987 { 1988 struct inet6_ifaddr *ifp; 1989 struct inet6_dev *idev; 1990 struct net_device *dev; 1991 1992 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL) 1993 return -ENODEV; 1994 1995 if ((idev = __in6_dev_get(dev)) == NULL) 1996 return -ENXIO; 1997 1998 read_lock_bh(&idev->lock); 1999 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2000 if (ifp->prefix_len == plen && 2001 ipv6_addr_equal(pfx, &ifp->addr)) { 2002 in6_ifa_hold(ifp); 2003 read_unlock_bh(&idev->lock); 2004 2005 ipv6_del_addr(ifp); 2006 2007 /* If the last address is deleted administratively, 2008 disable IPv6 on this interface. 2009 */ 2010 if (idev->addr_list == NULL) 2011 addrconf_ifdown(idev->dev, 1); 2012 return 0; 2013 } 2014 } 2015 read_unlock_bh(&idev->lock); 2016 return -EADDRNOTAVAIL; 2017 } 2018 2019 2020 int addrconf_add_ifaddr(void __user *arg) 2021 { 2022 struct in6_ifreq ireq; 2023 int err; 2024 2025 if (!capable(CAP_NET_ADMIN)) 2026 return -EPERM; 2027 2028 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2029 return -EFAULT; 2030 2031 rtnl_lock(); 2032 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 2033 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2034 rtnl_unlock(); 2035 return err; 2036 } 2037 2038 int addrconf_del_ifaddr(void __user *arg) 2039 { 2040 struct in6_ifreq ireq; 2041 int err; 2042 2043 if (!capable(CAP_NET_ADMIN)) 2044 return -EPERM; 2045 2046 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2047 return -EFAULT; 2048 2049 rtnl_lock(); 2050 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 2051 rtnl_unlock(); 2052 return err; 2053 } 2054 2055 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2056 static void sit_add_v4_addrs(struct inet6_dev *idev) 2057 { 2058 struct inet6_ifaddr * ifp; 2059 struct in6_addr addr; 2060 struct net_device *dev; 2061 int scope; 2062 2063 ASSERT_RTNL(); 2064 2065 memset(&addr, 0, sizeof(struct in6_addr)); 2066 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2067 2068 if (idev->dev->flags&IFF_POINTOPOINT) { 2069 addr.s6_addr32[0] = htonl(0xfe800000); 2070 scope = IFA_LINK; 2071 } else { 2072 scope = IPV6_ADDR_COMPATv4; 2073 } 2074 2075 if (addr.s6_addr32[3]) { 2076 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2077 if (!IS_ERR(ifp)) { 2078 spin_lock_bh(&ifp->lock); 2079 ifp->flags &= ~IFA_F_TENTATIVE; 2080 spin_unlock_bh(&ifp->lock); 2081 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2082 in6_ifa_put(ifp); 2083 } 2084 return; 2085 } 2086 2087 for_each_netdev(&init_net, dev) { 2088 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2089 if (in_dev && (dev->flags & IFF_UP)) { 2090 struct in_ifaddr * ifa; 2091 2092 int flag = scope; 2093 2094 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2095 int plen; 2096 2097 addr.s6_addr32[3] = ifa->ifa_local; 2098 2099 if (ifa->ifa_scope == RT_SCOPE_LINK) 2100 continue; 2101 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2102 if (idev->dev->flags&IFF_POINTOPOINT) 2103 continue; 2104 flag |= IFA_HOST; 2105 } 2106 if (idev->dev->flags&IFF_POINTOPOINT) 2107 plen = 64; 2108 else 2109 plen = 96; 2110 2111 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2112 IFA_F_PERMANENT); 2113 if (!IS_ERR(ifp)) { 2114 spin_lock_bh(&ifp->lock); 2115 ifp->flags &= ~IFA_F_TENTATIVE; 2116 spin_unlock_bh(&ifp->lock); 2117 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2118 in6_ifa_put(ifp); 2119 } 2120 } 2121 } 2122 } 2123 } 2124 #endif 2125 2126 static void init_loopback(struct net_device *dev) 2127 { 2128 struct inet6_dev *idev; 2129 struct inet6_ifaddr * ifp; 2130 2131 /* ::1 */ 2132 2133 ASSERT_RTNL(); 2134 2135 if ((idev = ipv6_find_idev(dev)) == NULL) { 2136 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2137 return; 2138 } 2139 2140 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2141 if (!IS_ERR(ifp)) { 2142 spin_lock_bh(&ifp->lock); 2143 ifp->flags &= ~IFA_F_TENTATIVE; 2144 spin_unlock_bh(&ifp->lock); 2145 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2146 in6_ifa_put(ifp); 2147 } 2148 } 2149 2150 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2151 { 2152 struct inet6_ifaddr * ifp; 2153 u32 addr_flags = IFA_F_PERMANENT; 2154 2155 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2156 if (idev->cnf.optimistic_dad && 2157 !ipv6_devconf.forwarding) 2158 addr_flags |= IFA_F_OPTIMISTIC; 2159 #endif 2160 2161 2162 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2163 if (!IS_ERR(ifp)) { 2164 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2165 addrconf_dad_start(ifp, 0); 2166 in6_ifa_put(ifp); 2167 } 2168 } 2169 2170 static void addrconf_dev_config(struct net_device *dev) 2171 { 2172 struct in6_addr addr; 2173 struct inet6_dev * idev; 2174 2175 ASSERT_RTNL(); 2176 2177 if ((dev->type != ARPHRD_ETHER) && 2178 (dev->type != ARPHRD_FDDI) && 2179 (dev->type != ARPHRD_IEEE802_TR) && 2180 (dev->type != ARPHRD_ARCNET) && 2181 (dev->type != ARPHRD_INFINIBAND)) { 2182 /* Alas, we support only Ethernet autoconfiguration. */ 2183 return; 2184 } 2185 2186 idev = addrconf_add_dev(dev); 2187 if (idev == NULL) 2188 return; 2189 2190 memset(&addr, 0, sizeof(struct in6_addr)); 2191 addr.s6_addr32[0] = htonl(0xFE800000); 2192 2193 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2194 addrconf_add_linklocal(idev, &addr); 2195 } 2196 2197 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2198 static void addrconf_sit_config(struct net_device *dev) 2199 { 2200 struct inet6_dev *idev; 2201 2202 ASSERT_RTNL(); 2203 2204 /* 2205 * Configure the tunnel with one of our IPv4 2206 * addresses... we should configure all of 2207 * our v4 addrs in the tunnel 2208 */ 2209 2210 if ((idev = ipv6_find_idev(dev)) == NULL) { 2211 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2212 return; 2213 } 2214 2215 if (dev->priv_flags & IFF_ISATAP) { 2216 struct in6_addr addr; 2217 2218 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2219 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2220 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2221 addrconf_add_linklocal(idev, &addr); 2222 return; 2223 } 2224 2225 sit_add_v4_addrs(idev); 2226 2227 if (dev->flags&IFF_POINTOPOINT) { 2228 addrconf_add_mroute(dev); 2229 addrconf_add_lroute(dev); 2230 } else 2231 sit_route_add(dev); 2232 } 2233 #endif 2234 2235 static inline int 2236 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2237 { 2238 struct in6_addr lladdr; 2239 2240 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2241 addrconf_add_linklocal(idev, &lladdr); 2242 return 0; 2243 } 2244 return -1; 2245 } 2246 2247 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2248 { 2249 struct net_device *link_dev; 2250 2251 /* first try to inherit the link-local address from the link device */ 2252 if (idev->dev->iflink && 2253 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) { 2254 if (!ipv6_inherit_linklocal(idev, link_dev)) 2255 return; 2256 } 2257 /* then try to inherit it from any device */ 2258 for_each_netdev(&init_net, link_dev) { 2259 if (!ipv6_inherit_linklocal(idev, link_dev)) 2260 return; 2261 } 2262 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2263 } 2264 2265 /* 2266 * Autoconfigure tunnel with a link-local address so routing protocols, 2267 * DHCPv6, MLD etc. can be run over the virtual link 2268 */ 2269 2270 static void addrconf_ip6_tnl_config(struct net_device *dev) 2271 { 2272 struct inet6_dev *idev; 2273 2274 ASSERT_RTNL(); 2275 2276 if ((idev = addrconf_add_dev(dev)) == NULL) { 2277 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2278 return; 2279 } 2280 ip6_tnl_add_linklocal(idev); 2281 } 2282 2283 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2284 void * data) 2285 { 2286 struct net_device *dev = (struct net_device *) data; 2287 struct inet6_dev *idev = __in6_dev_get(dev); 2288 int run_pending = 0; 2289 int err; 2290 2291 if (dev->nd_net != &init_net) 2292 return NOTIFY_DONE; 2293 2294 switch(event) { 2295 case NETDEV_REGISTER: 2296 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2297 idev = ipv6_add_dev(dev); 2298 if (!idev) 2299 return notifier_from_errno(-ENOMEM); 2300 } 2301 break; 2302 case NETDEV_UP: 2303 case NETDEV_CHANGE: 2304 if (dev->flags & IFF_SLAVE) 2305 break; 2306 2307 if (event == NETDEV_UP) { 2308 if (!addrconf_qdisc_ok(dev)) { 2309 /* device is not ready yet. */ 2310 printk(KERN_INFO 2311 "ADDRCONF(NETDEV_UP): %s: " 2312 "link is not ready\n", 2313 dev->name); 2314 break; 2315 } 2316 2317 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2318 idev = ipv6_add_dev(dev); 2319 2320 if (idev) 2321 idev->if_flags |= IF_READY; 2322 } else { 2323 if (!addrconf_qdisc_ok(dev)) { 2324 /* device is still not ready. */ 2325 break; 2326 } 2327 2328 if (idev) { 2329 if (idev->if_flags & IF_READY) { 2330 /* device is already configured. */ 2331 break; 2332 } 2333 idev->if_flags |= IF_READY; 2334 } 2335 2336 printk(KERN_INFO 2337 "ADDRCONF(NETDEV_CHANGE): %s: " 2338 "link becomes ready\n", 2339 dev->name); 2340 2341 run_pending = 1; 2342 } 2343 2344 switch(dev->type) { 2345 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2346 case ARPHRD_SIT: 2347 addrconf_sit_config(dev); 2348 break; 2349 #endif 2350 case ARPHRD_TUNNEL6: 2351 addrconf_ip6_tnl_config(dev); 2352 break; 2353 case ARPHRD_LOOPBACK: 2354 init_loopback(dev); 2355 break; 2356 2357 default: 2358 addrconf_dev_config(dev); 2359 break; 2360 } 2361 if (idev) { 2362 if (run_pending) 2363 addrconf_dad_run(idev); 2364 2365 /* If the MTU changed during the interface down, when the 2366 interface up, the changed MTU must be reflected in the 2367 idev as well as routers. 2368 */ 2369 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2370 rt6_mtu_change(dev, dev->mtu); 2371 idev->cnf.mtu6 = dev->mtu; 2372 } 2373 idev->tstamp = jiffies; 2374 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2375 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2376 stop IPv6 on this interface. 2377 */ 2378 if (dev->mtu < IPV6_MIN_MTU) 2379 addrconf_ifdown(dev, event != NETDEV_DOWN); 2380 } 2381 break; 2382 2383 case NETDEV_CHANGEMTU: 2384 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2385 rt6_mtu_change(dev, dev->mtu); 2386 idev->cnf.mtu6 = dev->mtu; 2387 break; 2388 } 2389 2390 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2391 idev = ipv6_add_dev(dev); 2392 if (idev) 2393 break; 2394 } 2395 2396 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2397 2398 case NETDEV_DOWN: 2399 case NETDEV_UNREGISTER: 2400 /* 2401 * Remove all addresses from this interface. 2402 */ 2403 addrconf_ifdown(dev, event != NETDEV_DOWN); 2404 break; 2405 2406 case NETDEV_CHANGENAME: 2407 if (idev) { 2408 snmp6_unregister_dev(idev); 2409 addrconf_sysctl_unregister(idev); 2410 addrconf_sysctl_register(idev); 2411 err = snmp6_register_dev(idev); 2412 if (err) 2413 return notifier_from_errno(err); 2414 } 2415 break; 2416 } 2417 2418 return NOTIFY_OK; 2419 } 2420 2421 /* 2422 * addrconf module should be notified of a device going up 2423 */ 2424 static struct notifier_block ipv6_dev_notf = { 2425 .notifier_call = addrconf_notify, 2426 .priority = 0 2427 }; 2428 2429 static int addrconf_ifdown(struct net_device *dev, int how) 2430 { 2431 struct inet6_dev *idev; 2432 struct inet6_ifaddr *ifa, **bifa; 2433 int i; 2434 2435 ASSERT_RTNL(); 2436 2437 if (dev == init_net.loopback_dev && how == 1) 2438 how = 0; 2439 2440 rt6_ifdown(dev); 2441 neigh_ifdown(&nd_tbl, dev); 2442 2443 idev = __in6_dev_get(dev); 2444 if (idev == NULL) 2445 return -ENODEV; 2446 2447 /* Step 1: remove reference to ipv6 device from parent device. 2448 Do not dev_put! 2449 */ 2450 if (how == 1) { 2451 idev->dead = 1; 2452 2453 /* protected by rtnl_lock */ 2454 rcu_assign_pointer(dev->ip6_ptr, NULL); 2455 2456 /* Step 1.5: remove snmp6 entry */ 2457 snmp6_unregister_dev(idev); 2458 2459 } 2460 2461 /* Step 2: clear hash table */ 2462 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2463 bifa = &inet6_addr_lst[i]; 2464 2465 write_lock_bh(&addrconf_hash_lock); 2466 while ((ifa = *bifa) != NULL) { 2467 if (ifa->idev == idev) { 2468 *bifa = ifa->lst_next; 2469 ifa->lst_next = NULL; 2470 addrconf_del_timer(ifa); 2471 in6_ifa_put(ifa); 2472 continue; 2473 } 2474 bifa = &ifa->lst_next; 2475 } 2476 write_unlock_bh(&addrconf_hash_lock); 2477 } 2478 2479 write_lock_bh(&idev->lock); 2480 2481 /* Step 3: clear flags for stateless addrconf */ 2482 if (how != 1) 2483 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2484 2485 /* Step 4: clear address list */ 2486 #ifdef CONFIG_IPV6_PRIVACY 2487 if (how == 1 && del_timer(&idev->regen_timer)) 2488 in6_dev_put(idev); 2489 2490 /* clear tempaddr list */ 2491 while ((ifa = idev->tempaddr_list) != NULL) { 2492 idev->tempaddr_list = ifa->tmp_next; 2493 ifa->tmp_next = NULL; 2494 ifa->dead = 1; 2495 write_unlock_bh(&idev->lock); 2496 spin_lock_bh(&ifa->lock); 2497 2498 if (ifa->ifpub) { 2499 in6_ifa_put(ifa->ifpub); 2500 ifa->ifpub = NULL; 2501 } 2502 spin_unlock_bh(&ifa->lock); 2503 in6_ifa_put(ifa); 2504 write_lock_bh(&idev->lock); 2505 } 2506 #endif 2507 while ((ifa = idev->addr_list) != NULL) { 2508 idev->addr_list = ifa->if_next; 2509 ifa->if_next = NULL; 2510 ifa->dead = 1; 2511 addrconf_del_timer(ifa); 2512 write_unlock_bh(&idev->lock); 2513 2514 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2515 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2516 in6_ifa_put(ifa); 2517 2518 write_lock_bh(&idev->lock); 2519 } 2520 write_unlock_bh(&idev->lock); 2521 2522 /* Step 5: Discard multicast list */ 2523 2524 if (how == 1) 2525 ipv6_mc_destroy_dev(idev); 2526 else 2527 ipv6_mc_down(idev); 2528 2529 idev->tstamp = jiffies; 2530 2531 /* Shot the device (if unregistered) */ 2532 2533 if (how == 1) { 2534 addrconf_sysctl_unregister(idev); 2535 neigh_parms_release(&nd_tbl, idev->nd_parms); 2536 neigh_ifdown(&nd_tbl, dev); 2537 in6_dev_put(idev); 2538 } 2539 return 0; 2540 } 2541 2542 static void addrconf_rs_timer(unsigned long data) 2543 { 2544 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2545 2546 if (ifp->idev->cnf.forwarding) 2547 goto out; 2548 2549 if (ifp->idev->if_flags & IF_RA_RCVD) { 2550 /* 2551 * Announcement received after solicitation 2552 * was sent 2553 */ 2554 goto out; 2555 } 2556 2557 spin_lock(&ifp->lock); 2558 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2559 struct in6_addr all_routers; 2560 2561 /* The wait after the last probe can be shorter */ 2562 addrconf_mod_timer(ifp, AC_RS, 2563 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2564 ifp->idev->cnf.rtr_solicit_delay : 2565 ifp->idev->cnf.rtr_solicit_interval); 2566 spin_unlock(&ifp->lock); 2567 2568 ipv6_addr_all_routers(&all_routers); 2569 2570 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2571 } else { 2572 spin_unlock(&ifp->lock); 2573 /* 2574 * Note: we do not support deprecated "all on-link" 2575 * assumption any longer. 2576 */ 2577 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2578 ifp->idev->dev->name); 2579 } 2580 2581 out: 2582 in6_ifa_put(ifp); 2583 } 2584 2585 /* 2586 * Duplicate Address Detection 2587 */ 2588 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2589 { 2590 unsigned long rand_num; 2591 struct inet6_dev *idev = ifp->idev; 2592 2593 if (ifp->flags & IFA_F_OPTIMISTIC) 2594 rand_num = 0; 2595 else 2596 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2597 2598 ifp->probes = idev->cnf.dad_transmits; 2599 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2600 } 2601 2602 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2603 { 2604 struct inet6_dev *idev = ifp->idev; 2605 struct net_device *dev = idev->dev; 2606 2607 addrconf_join_solict(dev, &ifp->addr); 2608 2609 net_srandom(ifp->addr.s6_addr32[3]); 2610 2611 read_lock_bh(&idev->lock); 2612 if (ifp->dead) 2613 goto out; 2614 spin_lock_bh(&ifp->lock); 2615 2616 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2617 !(ifp->flags&IFA_F_TENTATIVE) || 2618 ifp->flags & IFA_F_NODAD) { 2619 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2620 spin_unlock_bh(&ifp->lock); 2621 read_unlock_bh(&idev->lock); 2622 2623 addrconf_dad_completed(ifp); 2624 return; 2625 } 2626 2627 if (!(idev->if_flags & IF_READY)) { 2628 spin_unlock_bh(&ifp->lock); 2629 read_unlock_bh(&idev->lock); 2630 /* 2631 * If the defice is not ready: 2632 * - keep it tentative if it is a permanent address. 2633 * - otherwise, kill it. 2634 */ 2635 in6_ifa_hold(ifp); 2636 addrconf_dad_stop(ifp); 2637 return; 2638 } 2639 2640 /* 2641 * Optimistic nodes can start receiving 2642 * Frames right away 2643 */ 2644 if(ifp->flags & IFA_F_OPTIMISTIC) 2645 ip6_ins_rt(ifp->rt); 2646 2647 addrconf_dad_kick(ifp); 2648 spin_unlock_bh(&ifp->lock); 2649 out: 2650 read_unlock_bh(&idev->lock); 2651 } 2652 2653 static void addrconf_dad_timer(unsigned long data) 2654 { 2655 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2656 struct inet6_dev *idev = ifp->idev; 2657 struct in6_addr unspec; 2658 struct in6_addr mcaddr; 2659 2660 read_lock_bh(&idev->lock); 2661 if (idev->dead) { 2662 read_unlock_bh(&idev->lock); 2663 goto out; 2664 } 2665 spin_lock_bh(&ifp->lock); 2666 if (ifp->probes == 0) { 2667 /* 2668 * DAD was successful 2669 */ 2670 2671 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2672 spin_unlock_bh(&ifp->lock); 2673 read_unlock_bh(&idev->lock); 2674 2675 addrconf_dad_completed(ifp); 2676 2677 goto out; 2678 } 2679 2680 ifp->probes--; 2681 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2682 spin_unlock_bh(&ifp->lock); 2683 read_unlock_bh(&idev->lock); 2684 2685 /* send a neighbour solicitation for our addr */ 2686 memset(&unspec, 0, sizeof(unspec)); 2687 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2688 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2689 out: 2690 in6_ifa_put(ifp); 2691 } 2692 2693 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2694 { 2695 struct net_device * dev = ifp->idev->dev; 2696 2697 /* 2698 * Configure the address for reception. Now it is valid. 2699 */ 2700 2701 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2702 2703 /* If added prefix is link local and forwarding is off, 2704 start sending router solicitations. 2705 */ 2706 2707 if (ifp->idev->cnf.forwarding == 0 && 2708 ifp->idev->cnf.rtr_solicits > 0 && 2709 (dev->flags&IFF_LOOPBACK) == 0 && 2710 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2711 struct in6_addr all_routers; 2712 2713 ipv6_addr_all_routers(&all_routers); 2714 2715 /* 2716 * If a host as already performed a random delay 2717 * [...] as part of DAD [...] there is no need 2718 * to delay again before sending the first RS 2719 */ 2720 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2721 2722 spin_lock_bh(&ifp->lock); 2723 ifp->probes = 1; 2724 ifp->idev->if_flags |= IF_RS_SENT; 2725 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2726 spin_unlock_bh(&ifp->lock); 2727 } 2728 } 2729 2730 static void addrconf_dad_run(struct inet6_dev *idev) { 2731 struct inet6_ifaddr *ifp; 2732 2733 read_lock_bh(&idev->lock); 2734 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2735 spin_lock_bh(&ifp->lock); 2736 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2737 spin_unlock_bh(&ifp->lock); 2738 continue; 2739 } 2740 spin_unlock_bh(&ifp->lock); 2741 addrconf_dad_kick(ifp); 2742 } 2743 read_unlock_bh(&idev->lock); 2744 } 2745 2746 #ifdef CONFIG_PROC_FS 2747 struct if6_iter_state { 2748 struct seq_net_private p; 2749 int bucket; 2750 }; 2751 2752 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2753 { 2754 struct inet6_ifaddr *ifa = NULL; 2755 struct if6_iter_state *state = seq->private; 2756 struct net *net = state->p.net; 2757 2758 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2759 ifa = inet6_addr_lst[state->bucket]; 2760 2761 while (ifa && ifa->idev->dev->nd_net != net) 2762 ifa = ifa->lst_next; 2763 if (ifa) 2764 break; 2765 } 2766 return ifa; 2767 } 2768 2769 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2770 { 2771 struct if6_iter_state *state = seq->private; 2772 struct net *net = state->p.net; 2773 2774 ifa = ifa->lst_next; 2775 try_again: 2776 if (ifa) { 2777 if (ifa->idev->dev->nd_net != net) { 2778 ifa = ifa->lst_next; 2779 goto try_again; 2780 } 2781 } 2782 2783 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2784 ifa = inet6_addr_lst[state->bucket]; 2785 goto try_again; 2786 } 2787 2788 return ifa; 2789 } 2790 2791 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2792 { 2793 struct inet6_ifaddr *ifa = if6_get_first(seq); 2794 2795 if (ifa) 2796 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2797 --pos; 2798 return pos ? NULL : ifa; 2799 } 2800 2801 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2802 __acquires(addrconf_hash_lock) 2803 { 2804 read_lock_bh(&addrconf_hash_lock); 2805 return if6_get_idx(seq, *pos); 2806 } 2807 2808 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2809 { 2810 struct inet6_ifaddr *ifa; 2811 2812 ifa = if6_get_next(seq, v); 2813 ++*pos; 2814 return ifa; 2815 } 2816 2817 static void if6_seq_stop(struct seq_file *seq, void *v) 2818 __releases(addrconf_hash_lock) 2819 { 2820 read_unlock_bh(&addrconf_hash_lock); 2821 } 2822 2823 static int if6_seq_show(struct seq_file *seq, void *v) 2824 { 2825 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2826 seq_printf(seq, 2827 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2828 NIP6(ifp->addr), 2829 ifp->idev->dev->ifindex, 2830 ifp->prefix_len, 2831 ifp->scope, 2832 ifp->flags, 2833 ifp->idev->dev->name); 2834 return 0; 2835 } 2836 2837 static const struct seq_operations if6_seq_ops = { 2838 .start = if6_seq_start, 2839 .next = if6_seq_next, 2840 .show = if6_seq_show, 2841 .stop = if6_seq_stop, 2842 }; 2843 2844 static int if6_seq_open(struct inode *inode, struct file *file) 2845 { 2846 return seq_open_net(inode, file, &if6_seq_ops, 2847 sizeof(struct if6_iter_state)); 2848 } 2849 2850 static const struct file_operations if6_fops = { 2851 .owner = THIS_MODULE, 2852 .open = if6_seq_open, 2853 .read = seq_read, 2854 .llseek = seq_lseek, 2855 .release = seq_release_net, 2856 }; 2857 2858 static int if6_proc_net_init(struct net *net) 2859 { 2860 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 2861 return -ENOMEM; 2862 return 0; 2863 } 2864 2865 static void if6_proc_net_exit(struct net *net) 2866 { 2867 proc_net_remove(net, "if_inet6"); 2868 } 2869 2870 static struct pernet_operations if6_proc_net_ops = { 2871 .init = if6_proc_net_init, 2872 .exit = if6_proc_net_exit, 2873 }; 2874 2875 int __init if6_proc_init(void) 2876 { 2877 return register_pernet_subsys(&if6_proc_net_ops); 2878 } 2879 2880 void if6_proc_exit(void) 2881 { 2882 unregister_pernet_subsys(&if6_proc_net_ops); 2883 } 2884 #endif /* CONFIG_PROC_FS */ 2885 2886 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 2887 /* Check if address is a home address configured on any interface. */ 2888 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 2889 { 2890 int ret = 0; 2891 struct inet6_ifaddr * ifp; 2892 u8 hash = ipv6_addr_hash(addr); 2893 read_lock_bh(&addrconf_hash_lock); 2894 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2895 if (ifp->idev->dev->nd_net != net) 2896 continue; 2897 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 && 2898 (ifp->flags & IFA_F_HOMEADDRESS)) { 2899 ret = 1; 2900 break; 2901 } 2902 } 2903 read_unlock_bh(&addrconf_hash_lock); 2904 return ret; 2905 } 2906 #endif 2907 2908 /* 2909 * Periodic address status verification 2910 */ 2911 2912 static void addrconf_verify(unsigned long foo) 2913 { 2914 struct inet6_ifaddr *ifp; 2915 unsigned long now, next; 2916 int i; 2917 2918 spin_lock_bh(&addrconf_verify_lock); 2919 now = jiffies; 2920 next = now + ADDR_CHECK_FREQUENCY; 2921 2922 del_timer(&addr_chk_timer); 2923 2924 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2925 2926 restart: 2927 read_lock(&addrconf_hash_lock); 2928 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2929 unsigned long age; 2930 #ifdef CONFIG_IPV6_PRIVACY 2931 unsigned long regen_advance; 2932 #endif 2933 2934 if (ifp->flags & IFA_F_PERMANENT) 2935 continue; 2936 2937 spin_lock(&ifp->lock); 2938 age = (now - ifp->tstamp) / HZ; 2939 2940 #ifdef CONFIG_IPV6_PRIVACY 2941 regen_advance = ifp->idev->cnf.regen_max_retry * 2942 ifp->idev->cnf.dad_transmits * 2943 ifp->idev->nd_parms->retrans_time / HZ; 2944 #endif 2945 2946 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2947 age >= ifp->valid_lft) { 2948 spin_unlock(&ifp->lock); 2949 in6_ifa_hold(ifp); 2950 read_unlock(&addrconf_hash_lock); 2951 ipv6_del_addr(ifp); 2952 goto restart; 2953 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2954 spin_unlock(&ifp->lock); 2955 continue; 2956 } else if (age >= ifp->prefered_lft) { 2957 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2958 int deprecate = 0; 2959 2960 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2961 deprecate = 1; 2962 ifp->flags |= IFA_F_DEPRECATED; 2963 } 2964 2965 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2966 next = ifp->tstamp + ifp->valid_lft * HZ; 2967 2968 spin_unlock(&ifp->lock); 2969 2970 if (deprecate) { 2971 in6_ifa_hold(ifp); 2972 read_unlock(&addrconf_hash_lock); 2973 2974 ipv6_ifa_notify(0, ifp); 2975 in6_ifa_put(ifp); 2976 goto restart; 2977 } 2978 #ifdef CONFIG_IPV6_PRIVACY 2979 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2980 !(ifp->flags&IFA_F_TENTATIVE)) { 2981 if (age >= ifp->prefered_lft - regen_advance) { 2982 struct inet6_ifaddr *ifpub = ifp->ifpub; 2983 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2984 next = ifp->tstamp + ifp->prefered_lft * HZ; 2985 if (!ifp->regen_count && ifpub) { 2986 ifp->regen_count++; 2987 in6_ifa_hold(ifp); 2988 in6_ifa_hold(ifpub); 2989 spin_unlock(&ifp->lock); 2990 read_unlock(&addrconf_hash_lock); 2991 spin_lock(&ifpub->lock); 2992 ifpub->regen_count = 0; 2993 spin_unlock(&ifpub->lock); 2994 ipv6_create_tempaddr(ifpub, ifp); 2995 in6_ifa_put(ifpub); 2996 in6_ifa_put(ifp); 2997 goto restart; 2998 } 2999 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3000 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3001 spin_unlock(&ifp->lock); 3002 #endif 3003 } else { 3004 /* ifp->prefered_lft <= ifp->valid_lft */ 3005 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3006 next = ifp->tstamp + ifp->prefered_lft * HZ; 3007 spin_unlock(&ifp->lock); 3008 } 3009 } 3010 read_unlock(&addrconf_hash_lock); 3011 } 3012 3013 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3014 add_timer(&addr_chk_timer); 3015 spin_unlock_bh(&addrconf_verify_lock); 3016 } 3017 3018 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3019 { 3020 struct in6_addr *pfx = NULL; 3021 3022 if (addr) 3023 pfx = nla_data(addr); 3024 3025 if (local) { 3026 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3027 pfx = NULL; 3028 else 3029 pfx = nla_data(local); 3030 } 3031 3032 return pfx; 3033 } 3034 3035 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3036 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3037 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3038 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3039 }; 3040 3041 static int 3042 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3043 { 3044 struct net *net = skb->sk->sk_net; 3045 struct ifaddrmsg *ifm; 3046 struct nlattr *tb[IFA_MAX+1]; 3047 struct in6_addr *pfx; 3048 int err; 3049 3050 if (net != &init_net) 3051 return -EINVAL; 3052 3053 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3054 if (err < 0) 3055 return err; 3056 3057 ifm = nlmsg_data(nlh); 3058 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3059 if (pfx == NULL) 3060 return -EINVAL; 3061 3062 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3063 } 3064 3065 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3066 u32 prefered_lft, u32 valid_lft) 3067 { 3068 u32 flags = RTF_EXPIRES; 3069 3070 if (!valid_lft || (prefered_lft > valid_lft)) 3071 return -EINVAL; 3072 3073 if (valid_lft == INFINITY_LIFE_TIME) { 3074 ifa_flags |= IFA_F_PERMANENT; 3075 flags = 0; 3076 } else if (valid_lft >= 0x7FFFFFFF/HZ) 3077 valid_lft = 0x7FFFFFFF/HZ; 3078 3079 if (prefered_lft == 0) 3080 ifa_flags |= IFA_F_DEPRECATED; 3081 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 3082 (prefered_lft != INFINITY_LIFE_TIME)) 3083 prefered_lft = 0x7FFFFFFF/HZ; 3084 3085 spin_lock_bh(&ifp->lock); 3086 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3087 ifp->tstamp = jiffies; 3088 ifp->valid_lft = valid_lft; 3089 ifp->prefered_lft = prefered_lft; 3090 3091 spin_unlock_bh(&ifp->lock); 3092 if (!(ifp->flags&IFA_F_TENTATIVE)) 3093 ipv6_ifa_notify(0, ifp); 3094 3095 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3096 jiffies_to_clock_t(valid_lft * HZ), flags); 3097 addrconf_verify(0); 3098 3099 return 0; 3100 } 3101 3102 static int 3103 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3104 { 3105 struct net *net = skb->sk->sk_net; 3106 struct ifaddrmsg *ifm; 3107 struct nlattr *tb[IFA_MAX+1]; 3108 struct in6_addr *pfx; 3109 struct inet6_ifaddr *ifa; 3110 struct net_device *dev; 3111 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3112 u8 ifa_flags; 3113 int err; 3114 3115 if (net != &init_net) 3116 return -EINVAL; 3117 3118 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3119 if (err < 0) 3120 return err; 3121 3122 ifm = nlmsg_data(nlh); 3123 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3124 if (pfx == NULL) 3125 return -EINVAL; 3126 3127 if (tb[IFA_CACHEINFO]) { 3128 struct ifa_cacheinfo *ci; 3129 3130 ci = nla_data(tb[IFA_CACHEINFO]); 3131 valid_lft = ci->ifa_valid; 3132 preferred_lft = ci->ifa_prefered; 3133 } else { 3134 preferred_lft = INFINITY_LIFE_TIME; 3135 valid_lft = INFINITY_LIFE_TIME; 3136 } 3137 3138 dev = __dev_get_by_index(&init_net, ifm->ifa_index); 3139 if (dev == NULL) 3140 return -ENODEV; 3141 3142 /* We ignore other flags so far. */ 3143 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3144 3145 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3146 if (ifa == NULL) { 3147 /* 3148 * It would be best to check for !NLM_F_CREATE here but 3149 * userspace alreay relies on not having to provide this. 3150 */ 3151 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 3152 ifa_flags, preferred_lft, valid_lft); 3153 } 3154 3155 if (nlh->nlmsg_flags & NLM_F_EXCL || 3156 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3157 err = -EEXIST; 3158 else 3159 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3160 3161 in6_ifa_put(ifa); 3162 3163 return err; 3164 } 3165 3166 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3167 u8 scope, int ifindex) 3168 { 3169 struct ifaddrmsg *ifm; 3170 3171 ifm = nlmsg_data(nlh); 3172 ifm->ifa_family = AF_INET6; 3173 ifm->ifa_prefixlen = prefixlen; 3174 ifm->ifa_flags = flags; 3175 ifm->ifa_scope = scope; 3176 ifm->ifa_index = ifindex; 3177 } 3178 3179 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3180 unsigned long tstamp, u32 preferred, u32 valid) 3181 { 3182 struct ifa_cacheinfo ci; 3183 3184 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3185 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3186 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3187 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3188 ci.ifa_prefered = preferred; 3189 ci.ifa_valid = valid; 3190 3191 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3192 } 3193 3194 static inline int rt_scope(int ifa_scope) 3195 { 3196 if (ifa_scope & IFA_HOST) 3197 return RT_SCOPE_HOST; 3198 else if (ifa_scope & IFA_LINK) 3199 return RT_SCOPE_LINK; 3200 else if (ifa_scope & IFA_SITE) 3201 return RT_SCOPE_SITE; 3202 else 3203 return RT_SCOPE_UNIVERSE; 3204 } 3205 3206 static inline int inet6_ifaddr_msgsize(void) 3207 { 3208 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3209 + nla_total_size(16) /* IFA_ADDRESS */ 3210 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3211 } 3212 3213 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3214 u32 pid, u32 seq, int event, unsigned int flags) 3215 { 3216 struct nlmsghdr *nlh; 3217 u32 preferred, valid; 3218 3219 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3220 if (nlh == NULL) 3221 return -EMSGSIZE; 3222 3223 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3224 ifa->idev->dev->ifindex); 3225 3226 if (!(ifa->flags&IFA_F_PERMANENT)) { 3227 preferred = ifa->prefered_lft; 3228 valid = ifa->valid_lft; 3229 if (preferred != INFINITY_LIFE_TIME) { 3230 long tval = (jiffies - ifa->tstamp)/HZ; 3231 preferred -= tval; 3232 if (valid != INFINITY_LIFE_TIME) 3233 valid -= tval; 3234 } 3235 } else { 3236 preferred = INFINITY_LIFE_TIME; 3237 valid = INFINITY_LIFE_TIME; 3238 } 3239 3240 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3241 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3242 nlmsg_cancel(skb, nlh); 3243 return -EMSGSIZE; 3244 } 3245 3246 return nlmsg_end(skb, nlh); 3247 } 3248 3249 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3250 u32 pid, u32 seq, int event, u16 flags) 3251 { 3252 struct nlmsghdr *nlh; 3253 u8 scope = RT_SCOPE_UNIVERSE; 3254 int ifindex = ifmca->idev->dev->ifindex; 3255 3256 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3257 scope = RT_SCOPE_SITE; 3258 3259 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3260 if (nlh == NULL) 3261 return -EMSGSIZE; 3262 3263 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3264 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3265 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3266 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3267 nlmsg_cancel(skb, nlh); 3268 return -EMSGSIZE; 3269 } 3270 3271 return nlmsg_end(skb, nlh); 3272 } 3273 3274 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3275 u32 pid, u32 seq, int event, unsigned int flags) 3276 { 3277 struct nlmsghdr *nlh; 3278 u8 scope = RT_SCOPE_UNIVERSE; 3279 int ifindex = ifaca->aca_idev->dev->ifindex; 3280 3281 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3282 scope = RT_SCOPE_SITE; 3283 3284 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3285 if (nlh == NULL) 3286 return -EMSGSIZE; 3287 3288 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3289 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3290 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3291 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3292 nlmsg_cancel(skb, nlh); 3293 return -EMSGSIZE; 3294 } 3295 3296 return nlmsg_end(skb, nlh); 3297 } 3298 3299 enum addr_type_t 3300 { 3301 UNICAST_ADDR, 3302 MULTICAST_ADDR, 3303 ANYCAST_ADDR, 3304 }; 3305 3306 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3307 enum addr_type_t type) 3308 { 3309 int idx, ip_idx; 3310 int s_idx, s_ip_idx; 3311 int err = 1; 3312 struct net_device *dev; 3313 struct inet6_dev *idev = NULL; 3314 struct inet6_ifaddr *ifa; 3315 struct ifmcaddr6 *ifmca; 3316 struct ifacaddr6 *ifaca; 3317 3318 s_idx = cb->args[0]; 3319 s_ip_idx = ip_idx = cb->args[1]; 3320 3321 idx = 0; 3322 for_each_netdev(&init_net, dev) { 3323 if (idx < s_idx) 3324 goto cont; 3325 if (idx > s_idx) 3326 s_ip_idx = 0; 3327 ip_idx = 0; 3328 if ((idev = in6_dev_get(dev)) == NULL) 3329 goto cont; 3330 read_lock_bh(&idev->lock); 3331 switch (type) { 3332 case UNICAST_ADDR: 3333 /* unicast address incl. temp addr */ 3334 for (ifa = idev->addr_list; ifa; 3335 ifa = ifa->if_next, ip_idx++) { 3336 if (ip_idx < s_ip_idx) 3337 continue; 3338 err = inet6_fill_ifaddr(skb, ifa, 3339 NETLINK_CB(cb->skb).pid, 3340 cb->nlh->nlmsg_seq, 3341 RTM_NEWADDR, 3342 NLM_F_MULTI); 3343 } 3344 break; 3345 case MULTICAST_ADDR: 3346 /* multicast address */ 3347 for (ifmca = idev->mc_list; ifmca; 3348 ifmca = ifmca->next, ip_idx++) { 3349 if (ip_idx < s_ip_idx) 3350 continue; 3351 err = inet6_fill_ifmcaddr(skb, ifmca, 3352 NETLINK_CB(cb->skb).pid, 3353 cb->nlh->nlmsg_seq, 3354 RTM_GETMULTICAST, 3355 NLM_F_MULTI); 3356 } 3357 break; 3358 case ANYCAST_ADDR: 3359 /* anycast address */ 3360 for (ifaca = idev->ac_list; ifaca; 3361 ifaca = ifaca->aca_next, ip_idx++) { 3362 if (ip_idx < s_ip_idx) 3363 continue; 3364 err = inet6_fill_ifacaddr(skb, ifaca, 3365 NETLINK_CB(cb->skb).pid, 3366 cb->nlh->nlmsg_seq, 3367 RTM_GETANYCAST, 3368 NLM_F_MULTI); 3369 } 3370 break; 3371 default: 3372 break; 3373 } 3374 read_unlock_bh(&idev->lock); 3375 in6_dev_put(idev); 3376 3377 if (err <= 0) 3378 break; 3379 cont: 3380 idx++; 3381 } 3382 cb->args[0] = idx; 3383 cb->args[1] = ip_idx; 3384 return skb->len; 3385 } 3386 3387 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3388 { 3389 struct net *net = skb->sk->sk_net; 3390 enum addr_type_t type = UNICAST_ADDR; 3391 3392 if (net != &init_net) 3393 return 0; 3394 3395 return inet6_dump_addr(skb, cb, type); 3396 } 3397 3398 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3399 { 3400 struct net *net = skb->sk->sk_net; 3401 enum addr_type_t type = MULTICAST_ADDR; 3402 3403 if (net != &init_net) 3404 return 0; 3405 3406 return inet6_dump_addr(skb, cb, type); 3407 } 3408 3409 3410 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3411 { 3412 struct net *net = skb->sk->sk_net; 3413 enum addr_type_t type = ANYCAST_ADDR; 3414 3415 if (net != &init_net) 3416 return 0; 3417 3418 return inet6_dump_addr(skb, cb, type); 3419 } 3420 3421 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3422 void *arg) 3423 { 3424 struct net *net = in_skb->sk->sk_net; 3425 struct ifaddrmsg *ifm; 3426 struct nlattr *tb[IFA_MAX+1]; 3427 struct in6_addr *addr = NULL; 3428 struct net_device *dev = NULL; 3429 struct inet6_ifaddr *ifa; 3430 struct sk_buff *skb; 3431 int err; 3432 3433 if (net != &init_net) 3434 return -EINVAL; 3435 3436 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3437 if (err < 0) 3438 goto errout; 3439 3440 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3441 if (addr == NULL) { 3442 err = -EINVAL; 3443 goto errout; 3444 } 3445 3446 ifm = nlmsg_data(nlh); 3447 if (ifm->ifa_index) 3448 dev = __dev_get_by_index(&init_net, ifm->ifa_index); 3449 3450 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3451 err = -EADDRNOTAVAIL; 3452 goto errout; 3453 } 3454 3455 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3456 err = -ENOBUFS; 3457 goto errout_ifa; 3458 } 3459 3460 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3461 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3462 if (err < 0) { 3463 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3464 WARN_ON(err == -EMSGSIZE); 3465 kfree_skb(skb); 3466 goto errout_ifa; 3467 } 3468 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); 3469 errout_ifa: 3470 in6_ifa_put(ifa); 3471 errout: 3472 return err; 3473 } 3474 3475 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3476 { 3477 struct sk_buff *skb; 3478 int err = -ENOBUFS; 3479 3480 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3481 if (skb == NULL) 3482 goto errout; 3483 3484 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3485 if (err < 0) { 3486 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3487 WARN_ON(err == -EMSGSIZE); 3488 kfree_skb(skb); 3489 goto errout; 3490 } 3491 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3492 errout: 3493 if (err < 0) 3494 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err); 3495 } 3496 3497 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3498 __s32 *array, int bytes) 3499 { 3500 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3501 3502 memset(array, 0, bytes); 3503 array[DEVCONF_FORWARDING] = cnf->forwarding; 3504 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3505 array[DEVCONF_MTU6] = cnf->mtu6; 3506 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3507 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3508 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3509 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3510 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3511 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3512 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3513 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3514 #ifdef CONFIG_IPV6_PRIVACY 3515 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3516 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3517 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3518 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3519 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3520 #endif 3521 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3522 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3523 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3524 #ifdef CONFIG_IPV6_ROUTER_PREF 3525 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3526 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3527 #ifdef CONFIG_IPV6_ROUTE_INFO 3528 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3529 #endif 3530 #endif 3531 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3532 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3533 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3534 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3535 #endif 3536 } 3537 3538 static inline size_t inet6_if_nlmsg_size(void) 3539 { 3540 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3541 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3542 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3543 + nla_total_size(4) /* IFLA_MTU */ 3544 + nla_total_size(4) /* IFLA_LINK */ 3545 + nla_total_size( /* IFLA_PROTINFO */ 3546 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3547 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3548 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3549 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3550 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3551 ); 3552 } 3553 3554 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3555 int bytes) 3556 { 3557 int i; 3558 int pad = bytes - sizeof(u64) * items; 3559 BUG_ON(pad < 0); 3560 3561 /* Use put_unaligned() because stats may not be aligned for u64. */ 3562 put_unaligned(items, &stats[0]); 3563 for (i = 1; i < items; i++) 3564 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3565 3566 memset(&stats[items], 0, pad); 3567 } 3568 3569 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3570 int bytes) 3571 { 3572 switch(attrtype) { 3573 case IFLA_INET6_STATS: 3574 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3575 break; 3576 case IFLA_INET6_ICMP6STATS: 3577 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3578 break; 3579 } 3580 } 3581 3582 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3583 u32 pid, u32 seq, int event, unsigned int flags) 3584 { 3585 struct net_device *dev = idev->dev; 3586 struct nlattr *nla; 3587 struct ifinfomsg *hdr; 3588 struct nlmsghdr *nlh; 3589 void *protoinfo; 3590 struct ifla_cacheinfo ci; 3591 3592 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3593 if (nlh == NULL) 3594 return -EMSGSIZE; 3595 3596 hdr = nlmsg_data(nlh); 3597 hdr->ifi_family = AF_INET6; 3598 hdr->__ifi_pad = 0; 3599 hdr->ifi_type = dev->type; 3600 hdr->ifi_index = dev->ifindex; 3601 hdr->ifi_flags = dev_get_flags(dev); 3602 hdr->ifi_change = 0; 3603 3604 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3605 3606 if (dev->addr_len) 3607 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3608 3609 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3610 if (dev->ifindex != dev->iflink) 3611 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3612 3613 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3614 if (protoinfo == NULL) 3615 goto nla_put_failure; 3616 3617 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3618 3619 ci.max_reasm_len = IPV6_MAXPLEN; 3620 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3621 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3622 ci.reachable_time = idev->nd_parms->reachable_time; 3623 ci.retrans_time = idev->nd_parms->retrans_time; 3624 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3625 3626 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3627 if (nla == NULL) 3628 goto nla_put_failure; 3629 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3630 3631 /* XXX - MC not implemented */ 3632 3633 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3634 if (nla == NULL) 3635 goto nla_put_failure; 3636 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3637 3638 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3639 if (nla == NULL) 3640 goto nla_put_failure; 3641 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3642 3643 nla_nest_end(skb, protoinfo); 3644 return nlmsg_end(skb, nlh); 3645 3646 nla_put_failure: 3647 nlmsg_cancel(skb, nlh); 3648 return -EMSGSIZE; 3649 } 3650 3651 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3652 { 3653 struct net *net = skb->sk->sk_net; 3654 int idx, err; 3655 int s_idx = cb->args[0]; 3656 struct net_device *dev; 3657 struct inet6_dev *idev; 3658 3659 if (net != &init_net) 3660 return 0; 3661 3662 read_lock(&dev_base_lock); 3663 idx = 0; 3664 for_each_netdev(&init_net, dev) { 3665 if (idx < s_idx) 3666 goto cont; 3667 if ((idev = in6_dev_get(dev)) == NULL) 3668 goto cont; 3669 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3670 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3671 in6_dev_put(idev); 3672 if (err <= 0) 3673 break; 3674 cont: 3675 idx++; 3676 } 3677 read_unlock(&dev_base_lock); 3678 cb->args[0] = idx; 3679 3680 return skb->len; 3681 } 3682 3683 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3684 { 3685 struct sk_buff *skb; 3686 int err = -ENOBUFS; 3687 3688 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3689 if (skb == NULL) 3690 goto errout; 3691 3692 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3693 if (err < 0) { 3694 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3695 WARN_ON(err == -EMSGSIZE); 3696 kfree_skb(skb); 3697 goto errout; 3698 } 3699 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3700 errout: 3701 if (err < 0) 3702 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err); 3703 } 3704 3705 static inline size_t inet6_prefix_nlmsg_size(void) 3706 { 3707 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3708 + nla_total_size(sizeof(struct in6_addr)) 3709 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3710 } 3711 3712 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3713 struct prefix_info *pinfo, u32 pid, u32 seq, 3714 int event, unsigned int flags) 3715 { 3716 struct prefixmsg *pmsg; 3717 struct nlmsghdr *nlh; 3718 struct prefix_cacheinfo ci; 3719 3720 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3721 if (nlh == NULL) 3722 return -EMSGSIZE; 3723 3724 pmsg = nlmsg_data(nlh); 3725 pmsg->prefix_family = AF_INET6; 3726 pmsg->prefix_pad1 = 0; 3727 pmsg->prefix_pad2 = 0; 3728 pmsg->prefix_ifindex = idev->dev->ifindex; 3729 pmsg->prefix_len = pinfo->prefix_len; 3730 pmsg->prefix_type = pinfo->type; 3731 pmsg->prefix_pad3 = 0; 3732 pmsg->prefix_flags = 0; 3733 if (pinfo->onlink) 3734 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3735 if (pinfo->autoconf) 3736 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3737 3738 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3739 3740 ci.preferred_time = ntohl(pinfo->prefered); 3741 ci.valid_time = ntohl(pinfo->valid); 3742 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3743 3744 return nlmsg_end(skb, nlh); 3745 3746 nla_put_failure: 3747 nlmsg_cancel(skb, nlh); 3748 return -EMSGSIZE; 3749 } 3750 3751 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3752 struct prefix_info *pinfo) 3753 { 3754 struct sk_buff *skb; 3755 int err = -ENOBUFS; 3756 3757 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3758 if (skb == NULL) 3759 goto errout; 3760 3761 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3762 if (err < 0) { 3763 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3764 WARN_ON(err == -EMSGSIZE); 3765 kfree_skb(skb); 3766 goto errout; 3767 } 3768 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3769 errout: 3770 if (err < 0) 3771 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err); 3772 } 3773 3774 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3775 { 3776 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3777 3778 switch (event) { 3779 case RTM_NEWADDR: 3780 /* 3781 * If the address was optimistic 3782 * we inserted the route at the start of 3783 * our DAD process, so we don't need 3784 * to do it again 3785 */ 3786 if (!(ifp->rt->rt6i_node)) 3787 ip6_ins_rt(ifp->rt); 3788 if (ifp->idev->cnf.forwarding) 3789 addrconf_join_anycast(ifp); 3790 break; 3791 case RTM_DELADDR: 3792 if (ifp->idev->cnf.forwarding) 3793 addrconf_leave_anycast(ifp); 3794 addrconf_leave_solict(ifp->idev, &ifp->addr); 3795 dst_hold(&ifp->rt->u.dst); 3796 if (ip6_del_rt(ifp->rt)) 3797 dst_free(&ifp->rt->u.dst); 3798 break; 3799 } 3800 } 3801 3802 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3803 { 3804 rcu_read_lock_bh(); 3805 if (likely(ifp->idev->dead == 0)) 3806 __ipv6_ifa_notify(event, ifp); 3807 rcu_read_unlock_bh(); 3808 } 3809 3810 #ifdef CONFIG_SYSCTL 3811 3812 static 3813 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3814 void __user *buffer, size_t *lenp, loff_t *ppos) 3815 { 3816 int *valp = ctl->data; 3817 int val = *valp; 3818 int ret; 3819 3820 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3821 3822 if (write) 3823 addrconf_fixup_forwarding(ctl, valp, val); 3824 return ret; 3825 } 3826 3827 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3828 int __user *name, int nlen, 3829 void __user *oldval, 3830 size_t __user *oldlenp, 3831 void __user *newval, size_t newlen) 3832 { 3833 int *valp = table->data; 3834 int val = *valp; 3835 int new; 3836 3837 if (!newval || !newlen) 3838 return 0; 3839 if (newlen != sizeof(int)) 3840 return -EINVAL; 3841 if (get_user(new, (int __user *)newval)) 3842 return -EFAULT; 3843 if (new == *valp) 3844 return 0; 3845 if (oldval && oldlenp) { 3846 size_t len; 3847 if (get_user(len, oldlenp)) 3848 return -EFAULT; 3849 if (len) { 3850 if (len > table->maxlen) 3851 len = table->maxlen; 3852 if (copy_to_user(oldval, valp, len)) 3853 return -EFAULT; 3854 if (put_user(len, oldlenp)) 3855 return -EFAULT; 3856 } 3857 } 3858 3859 *valp = new; 3860 addrconf_fixup_forwarding(table, valp, val); 3861 return 1; 3862 } 3863 3864 static struct addrconf_sysctl_table 3865 { 3866 struct ctl_table_header *sysctl_header; 3867 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3868 char *dev_name; 3869 } addrconf_sysctl __read_mostly = { 3870 .sysctl_header = NULL, 3871 .addrconf_vars = { 3872 { 3873 .ctl_name = NET_IPV6_FORWARDING, 3874 .procname = "forwarding", 3875 .data = &ipv6_devconf.forwarding, 3876 .maxlen = sizeof(int), 3877 .mode = 0644, 3878 .proc_handler = &addrconf_sysctl_forward, 3879 .strategy = &addrconf_sysctl_forward_strategy, 3880 }, 3881 { 3882 .ctl_name = NET_IPV6_HOP_LIMIT, 3883 .procname = "hop_limit", 3884 .data = &ipv6_devconf.hop_limit, 3885 .maxlen = sizeof(int), 3886 .mode = 0644, 3887 .proc_handler = proc_dointvec, 3888 }, 3889 { 3890 .ctl_name = NET_IPV6_MTU, 3891 .procname = "mtu", 3892 .data = &ipv6_devconf.mtu6, 3893 .maxlen = sizeof(int), 3894 .mode = 0644, 3895 .proc_handler = &proc_dointvec, 3896 }, 3897 { 3898 .ctl_name = NET_IPV6_ACCEPT_RA, 3899 .procname = "accept_ra", 3900 .data = &ipv6_devconf.accept_ra, 3901 .maxlen = sizeof(int), 3902 .mode = 0644, 3903 .proc_handler = &proc_dointvec, 3904 }, 3905 { 3906 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3907 .procname = "accept_redirects", 3908 .data = &ipv6_devconf.accept_redirects, 3909 .maxlen = sizeof(int), 3910 .mode = 0644, 3911 .proc_handler = &proc_dointvec, 3912 }, 3913 { 3914 .ctl_name = NET_IPV6_AUTOCONF, 3915 .procname = "autoconf", 3916 .data = &ipv6_devconf.autoconf, 3917 .maxlen = sizeof(int), 3918 .mode = 0644, 3919 .proc_handler = &proc_dointvec, 3920 }, 3921 { 3922 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3923 .procname = "dad_transmits", 3924 .data = &ipv6_devconf.dad_transmits, 3925 .maxlen = sizeof(int), 3926 .mode = 0644, 3927 .proc_handler = &proc_dointvec, 3928 }, 3929 { 3930 .ctl_name = NET_IPV6_RTR_SOLICITS, 3931 .procname = "router_solicitations", 3932 .data = &ipv6_devconf.rtr_solicits, 3933 .maxlen = sizeof(int), 3934 .mode = 0644, 3935 .proc_handler = &proc_dointvec, 3936 }, 3937 { 3938 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3939 .procname = "router_solicitation_interval", 3940 .data = &ipv6_devconf.rtr_solicit_interval, 3941 .maxlen = sizeof(int), 3942 .mode = 0644, 3943 .proc_handler = &proc_dointvec_jiffies, 3944 .strategy = &sysctl_jiffies, 3945 }, 3946 { 3947 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3948 .procname = "router_solicitation_delay", 3949 .data = &ipv6_devconf.rtr_solicit_delay, 3950 .maxlen = sizeof(int), 3951 .mode = 0644, 3952 .proc_handler = &proc_dointvec_jiffies, 3953 .strategy = &sysctl_jiffies, 3954 }, 3955 { 3956 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3957 .procname = "force_mld_version", 3958 .data = &ipv6_devconf.force_mld_version, 3959 .maxlen = sizeof(int), 3960 .mode = 0644, 3961 .proc_handler = &proc_dointvec, 3962 }, 3963 #ifdef CONFIG_IPV6_PRIVACY 3964 { 3965 .ctl_name = NET_IPV6_USE_TEMPADDR, 3966 .procname = "use_tempaddr", 3967 .data = &ipv6_devconf.use_tempaddr, 3968 .maxlen = sizeof(int), 3969 .mode = 0644, 3970 .proc_handler = &proc_dointvec, 3971 }, 3972 { 3973 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3974 .procname = "temp_valid_lft", 3975 .data = &ipv6_devconf.temp_valid_lft, 3976 .maxlen = sizeof(int), 3977 .mode = 0644, 3978 .proc_handler = &proc_dointvec, 3979 }, 3980 { 3981 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3982 .procname = "temp_prefered_lft", 3983 .data = &ipv6_devconf.temp_prefered_lft, 3984 .maxlen = sizeof(int), 3985 .mode = 0644, 3986 .proc_handler = &proc_dointvec, 3987 }, 3988 { 3989 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3990 .procname = "regen_max_retry", 3991 .data = &ipv6_devconf.regen_max_retry, 3992 .maxlen = sizeof(int), 3993 .mode = 0644, 3994 .proc_handler = &proc_dointvec, 3995 }, 3996 { 3997 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3998 .procname = "max_desync_factor", 3999 .data = &ipv6_devconf.max_desync_factor, 4000 .maxlen = sizeof(int), 4001 .mode = 0644, 4002 .proc_handler = &proc_dointvec, 4003 }, 4004 #endif 4005 { 4006 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4007 .procname = "max_addresses", 4008 .data = &ipv6_devconf.max_addresses, 4009 .maxlen = sizeof(int), 4010 .mode = 0644, 4011 .proc_handler = &proc_dointvec, 4012 }, 4013 { 4014 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4015 .procname = "accept_ra_defrtr", 4016 .data = &ipv6_devconf.accept_ra_defrtr, 4017 .maxlen = sizeof(int), 4018 .mode = 0644, 4019 .proc_handler = &proc_dointvec, 4020 }, 4021 { 4022 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4023 .procname = "accept_ra_pinfo", 4024 .data = &ipv6_devconf.accept_ra_pinfo, 4025 .maxlen = sizeof(int), 4026 .mode = 0644, 4027 .proc_handler = &proc_dointvec, 4028 }, 4029 #ifdef CONFIG_IPV6_ROUTER_PREF 4030 { 4031 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4032 .procname = "accept_ra_rtr_pref", 4033 .data = &ipv6_devconf.accept_ra_rtr_pref, 4034 .maxlen = sizeof(int), 4035 .mode = 0644, 4036 .proc_handler = &proc_dointvec, 4037 }, 4038 { 4039 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4040 .procname = "router_probe_interval", 4041 .data = &ipv6_devconf.rtr_probe_interval, 4042 .maxlen = sizeof(int), 4043 .mode = 0644, 4044 .proc_handler = &proc_dointvec_jiffies, 4045 .strategy = &sysctl_jiffies, 4046 }, 4047 #ifdef CONFIG_IPV6_ROUTE_INFO 4048 { 4049 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4050 .procname = "accept_ra_rt_info_max_plen", 4051 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4052 .maxlen = sizeof(int), 4053 .mode = 0644, 4054 .proc_handler = &proc_dointvec, 4055 }, 4056 #endif 4057 #endif 4058 { 4059 .ctl_name = NET_IPV6_PROXY_NDP, 4060 .procname = "proxy_ndp", 4061 .data = &ipv6_devconf.proxy_ndp, 4062 .maxlen = sizeof(int), 4063 .mode = 0644, 4064 .proc_handler = &proc_dointvec, 4065 }, 4066 { 4067 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4068 .procname = "accept_source_route", 4069 .data = &ipv6_devconf.accept_source_route, 4070 .maxlen = sizeof(int), 4071 .mode = 0644, 4072 .proc_handler = &proc_dointvec, 4073 }, 4074 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4075 { 4076 .ctl_name = CTL_UNNUMBERED, 4077 .procname = "optimistic_dad", 4078 .data = &ipv6_devconf.optimistic_dad, 4079 .maxlen = sizeof(int), 4080 .mode = 0644, 4081 .proc_handler = &proc_dointvec, 4082 4083 }, 4084 #endif 4085 { 4086 .ctl_name = 0, /* sentinel */ 4087 } 4088 }, 4089 }; 4090 4091 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4092 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4093 { 4094 int i; 4095 struct addrconf_sysctl_table *t; 4096 4097 #define ADDRCONF_CTL_PATH_DEV 3 4098 4099 struct ctl_path addrconf_ctl_path[] = { 4100 { .procname = "net", .ctl_name = CTL_NET, }, 4101 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4102 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4103 { /* to be set */ }, 4104 { }, 4105 }; 4106 4107 4108 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4109 if (t == NULL) 4110 goto out; 4111 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 t->addrconf_vars[i].extra2 = net; 4116 } 4117 4118 /* 4119 * Make a copy of dev_name, because '.procname' is regarded as const 4120 * by sysctl and we wouldn't want anyone to change it under our feet 4121 * (see SIOCSIFNAME). 4122 */ 4123 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4124 if (!t->dev_name) 4125 goto free; 4126 4127 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4128 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4129 4130 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4131 t->addrconf_vars); 4132 if (t->sysctl_header == NULL) 4133 goto free_procname; 4134 4135 p->sysctl = t; 4136 return 0; 4137 4138 free_procname: 4139 kfree(t->dev_name); 4140 free: 4141 kfree(t); 4142 out: 4143 return -ENOBUFS; 4144 } 4145 4146 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4147 { 4148 struct addrconf_sysctl_table *t; 4149 4150 if (p->sysctl == NULL) 4151 return; 4152 4153 t = p->sysctl; 4154 p->sysctl = NULL; 4155 unregister_sysctl_table(t->sysctl_header); 4156 kfree(t->dev_name); 4157 kfree(t); 4158 } 4159 4160 static void addrconf_sysctl_register(struct inet6_dev *idev) 4161 { 4162 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4163 NET_IPV6_NEIGH, "ipv6", 4164 &ndisc_ifinfo_sysctl_change, 4165 NULL); 4166 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name, 4167 idev->dev->ifindex, idev, &idev->cnf); 4168 } 4169 4170 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4171 { 4172 __addrconf_sysctl_unregister(&idev->cnf); 4173 neigh_sysctl_unregister(idev->nd_parms); 4174 } 4175 4176 4177 #endif 4178 4179 static int addrconf_init_net(struct net *net) 4180 { 4181 int err; 4182 struct ipv6_devconf *all, *dflt; 4183 4184 err = -ENOMEM; 4185 all = &ipv6_devconf; 4186 dflt = &ipv6_devconf_dflt; 4187 4188 if (net != &init_net) { 4189 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4190 if (all == NULL) 4191 goto err_alloc_all; 4192 4193 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4194 if (dflt == NULL) 4195 goto err_alloc_dflt; 4196 } 4197 4198 net->ipv6.devconf_all = all; 4199 net->ipv6.devconf_dflt = dflt; 4200 4201 #ifdef CONFIG_SYSCTL 4202 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4203 NULL, all); 4204 if (err < 0) 4205 goto err_reg_all; 4206 4207 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4208 NULL, dflt); 4209 if (err < 0) 4210 goto err_reg_dflt; 4211 #endif 4212 return 0; 4213 4214 #ifdef CONFIG_SYSCTL 4215 err_reg_dflt: 4216 __addrconf_sysctl_unregister(all); 4217 err_reg_all: 4218 kfree(dflt); 4219 #endif 4220 err_alloc_dflt: 4221 kfree(all); 4222 err_alloc_all: 4223 return err; 4224 } 4225 4226 static void addrconf_exit_net(struct net *net) 4227 { 4228 #ifdef CONFIG_SYSCTL 4229 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4230 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4231 #endif 4232 if (net != &init_net) { 4233 kfree(net->ipv6.devconf_dflt); 4234 kfree(net->ipv6.devconf_all); 4235 } 4236 } 4237 4238 static struct pernet_operations addrconf_ops = { 4239 .init = addrconf_init_net, 4240 .exit = addrconf_exit_net, 4241 }; 4242 4243 /* 4244 * Device notifier 4245 */ 4246 4247 int register_inet6addr_notifier(struct notifier_block *nb) 4248 { 4249 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4250 } 4251 4252 EXPORT_SYMBOL(register_inet6addr_notifier); 4253 4254 int unregister_inet6addr_notifier(struct notifier_block *nb) 4255 { 4256 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4257 } 4258 4259 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4260 4261 /* 4262 * Init / cleanup code 4263 */ 4264 4265 int __init addrconf_init(void) 4266 { 4267 int err; 4268 4269 if ((err = ipv6_addr_label_init()) < 0) { 4270 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4271 err); 4272 return err; 4273 } 4274 4275 register_pernet_subsys(&addrconf_ops); 4276 4277 /* The addrconf netdev notifier requires that loopback_dev 4278 * has it's ipv6 private information allocated and setup 4279 * before it can bring up and give link-local addresses 4280 * to other devices which are up. 4281 * 4282 * Unfortunately, loopback_dev is not necessarily the first 4283 * entry in the global dev_base list of net devices. In fact, 4284 * it is likely to be the very last entry on that list. 4285 * So this causes the notifier registry below to try and 4286 * give link-local addresses to all devices besides loopback_dev 4287 * first, then loopback_dev, which cases all the non-loopback_dev 4288 * devices to fail to get a link-local address. 4289 * 4290 * So, as a temporary fix, allocate the ipv6 structure for 4291 * loopback_dev first by hand. 4292 * Longer term, all of the dependencies ipv6 has upon the loopback 4293 * device and it being up should be removed. 4294 */ 4295 rtnl_lock(); 4296 if (!ipv6_add_dev(init_net.loopback_dev)) 4297 err = -ENOMEM; 4298 rtnl_unlock(); 4299 if (err) 4300 goto errlo; 4301 4302 ip6_null_entry.u.dst.dev = init_net.loopback_dev; 4303 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev); 4304 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 4305 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev; 4306 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev); 4307 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev; 4308 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev); 4309 #endif 4310 4311 register_netdevice_notifier(&ipv6_dev_notf); 4312 4313 addrconf_verify(0); 4314 4315 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4316 if (err < 0) 4317 goto errout; 4318 4319 /* Only the first call to __rtnl_register can fail */ 4320 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4321 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4322 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4323 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4324 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4325 4326 ipv6_addr_label_rtnl_register(); 4327 4328 return 0; 4329 errout: 4330 unregister_netdevice_notifier(&ipv6_dev_notf); 4331 errlo: 4332 unregister_pernet_subsys(&addrconf_ops); 4333 4334 return err; 4335 } 4336 4337 void addrconf_cleanup(void) 4338 { 4339 struct net_device *dev; 4340 struct inet6_ifaddr *ifa; 4341 int i; 4342 4343 unregister_netdevice_notifier(&ipv6_dev_notf); 4344 4345 unregister_pernet_subsys(&addrconf_ops); 4346 4347 rtnl_lock(); 4348 4349 /* 4350 * clean dev list. 4351 */ 4352 4353 for_each_netdev(&init_net, dev) { 4354 if (__in6_dev_get(dev) == NULL) 4355 continue; 4356 addrconf_ifdown(dev, 1); 4357 } 4358 addrconf_ifdown(init_net.loopback_dev, 2); 4359 4360 /* 4361 * Check hash table. 4362 */ 4363 4364 write_lock_bh(&addrconf_hash_lock); 4365 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4366 for (ifa=inet6_addr_lst[i]; ifa; ) { 4367 struct inet6_ifaddr *bifa; 4368 4369 bifa = ifa; 4370 ifa = ifa->lst_next; 4371 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4372 /* Do not free it; something is wrong. 4373 Now we can investigate it with debugger. 4374 */ 4375 } 4376 } 4377 write_unlock_bh(&addrconf_hash_lock); 4378 4379 del_timer(&addr_chk_timer); 4380 4381 rtnl_unlock(); 4382 } 4383