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_net(dev)->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 __func__, 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 __func__, 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(net); 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(dev_net(idev->dev), 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 struct net *net = dev_net(ifp->idev->dev); 755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 756 rt = rt6_lookup(net, &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 unsigned long regen_advance; 780 int tmp_plen; 781 int ret = 0; 782 int max_addresses; 783 u32 addr_flags; 784 785 write_lock(&idev->lock); 786 if (ift) { 787 spin_lock_bh(&ift->lock); 788 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 789 spin_unlock_bh(&ift->lock); 790 tmpaddr = &addr; 791 } else { 792 tmpaddr = NULL; 793 } 794 retry: 795 in6_dev_hold(idev); 796 if (idev->cnf.use_tempaddr <= 0) { 797 write_unlock(&idev->lock); 798 printk(KERN_INFO 799 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 800 in6_dev_put(idev); 801 ret = -1; 802 goto out; 803 } 804 spin_lock_bh(&ifp->lock); 805 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 806 idev->cnf.use_tempaddr = -1; /*XXX*/ 807 spin_unlock_bh(&ifp->lock); 808 write_unlock(&idev->lock); 809 printk(KERN_WARNING 810 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 811 in6_dev_put(idev); 812 ret = -1; 813 goto out; 814 } 815 in6_ifa_hold(ifp); 816 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 817 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 818 spin_unlock_bh(&ifp->lock); 819 write_unlock(&idev->lock); 820 printk(KERN_WARNING 821 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 822 in6_ifa_put(ifp); 823 in6_dev_put(idev); 824 ret = -1; 825 goto out; 826 } 827 memcpy(&addr.s6_addr[8], idev->rndid, 8); 828 tmp_valid_lft = min_t(__u32, 829 ifp->valid_lft, 830 idev->cnf.temp_valid_lft); 831 tmp_prefered_lft = min_t(__u32, 832 ifp->prefered_lft, 833 idev->cnf.temp_prefered_lft - desync_factor / HZ); 834 tmp_plen = ifp->prefix_len; 835 max_addresses = idev->cnf.max_addresses; 836 tmp_cstamp = ifp->cstamp; 837 tmp_tstamp = ifp->tstamp; 838 spin_unlock_bh(&ifp->lock); 839 840 regen_advance = idev->cnf.regen_max_retry * 841 idev->cnf.dad_transmits * 842 idev->nd_parms->retrans_time / HZ; 843 write_unlock(&idev->lock); 844 845 /* A temporary address is created only if this calculated Preferred 846 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 847 * an implementation must not create a temporary address with a zero 848 * Preferred Lifetime. 849 */ 850 if (tmp_prefered_lft <= regen_advance) { 851 in6_ifa_put(ifp); 852 in6_dev_put(idev); 853 ret = -1; 854 goto out; 855 } 856 857 addr_flags = IFA_F_TEMPORARY; 858 /* set in addrconf_prefix_rcv() */ 859 if (ifp->flags & IFA_F_OPTIMISTIC) 860 addr_flags |= IFA_F_OPTIMISTIC; 861 862 ift = !max_addresses || 863 ipv6_count_addresses(idev) < max_addresses ? 864 ipv6_add_addr(idev, &addr, tmp_plen, 865 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 866 addr_flags) : NULL; 867 if (!ift || IS_ERR(ift)) { 868 in6_ifa_put(ifp); 869 in6_dev_put(idev); 870 printk(KERN_INFO 871 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 872 tmpaddr = &addr; 873 write_lock(&idev->lock); 874 goto retry; 875 } 876 877 spin_lock_bh(&ift->lock); 878 ift->ifpub = ifp; 879 ift->valid_lft = tmp_valid_lft; 880 ift->prefered_lft = tmp_prefered_lft; 881 ift->cstamp = tmp_cstamp; 882 ift->tstamp = tmp_tstamp; 883 spin_unlock_bh(&ift->lock); 884 885 addrconf_dad_start(ift, 0); 886 in6_ifa_put(ift); 887 in6_dev_put(idev); 888 out: 889 return ret; 890 } 891 #endif 892 893 /* 894 * Choose an appropriate source address (RFC3484) 895 */ 896 enum { 897 IPV6_SADDR_RULE_INIT = 0, 898 IPV6_SADDR_RULE_LOCAL, 899 IPV6_SADDR_RULE_SCOPE, 900 IPV6_SADDR_RULE_PREFERRED, 901 #ifdef CONFIG_IPV6_MIP6 902 IPV6_SADDR_RULE_HOA, 903 #endif 904 IPV6_SADDR_RULE_OIF, 905 IPV6_SADDR_RULE_LABEL, 906 #ifdef CONFIG_IPV6_PRIVACY 907 IPV6_SADDR_RULE_PRIVACY, 908 #endif 909 IPV6_SADDR_RULE_ORCHID, 910 IPV6_SADDR_RULE_PREFIX, 911 IPV6_SADDR_RULE_MAX 912 }; 913 914 struct ipv6_saddr_score { 915 int rule; 916 int addr_type; 917 struct inet6_ifaddr *ifa; 918 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 919 int scopedist; 920 int matchlen; 921 }; 922 923 struct ipv6_saddr_dst { 924 struct in6_addr *addr; 925 int ifindex; 926 int scope; 927 int label; 928 unsigned int prefs; 929 }; 930 931 static inline int ipv6_saddr_preferred(int type) 932 { 933 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 934 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 935 return 1; 936 return 0; 937 } 938 939 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score, 940 struct ipv6_saddr_dst *dst, 941 int i) 942 { 943 int ret; 944 945 if (i <= score->rule) { 946 switch (i) { 947 case IPV6_SADDR_RULE_SCOPE: 948 ret = score->scopedist; 949 break; 950 case IPV6_SADDR_RULE_PREFIX: 951 ret = score->matchlen; 952 break; 953 default: 954 ret = !!test_bit(i, score->scorebits); 955 } 956 goto out; 957 } 958 959 switch (i) { 960 case IPV6_SADDR_RULE_INIT: 961 /* Rule 0: remember if hiscore is not ready yet */ 962 ret = !!score->ifa; 963 break; 964 case IPV6_SADDR_RULE_LOCAL: 965 /* Rule 1: Prefer same address */ 966 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 967 break; 968 case IPV6_SADDR_RULE_SCOPE: 969 /* Rule 2: Prefer appropriate scope 970 * 971 * ret 972 * ^ 973 * -1 | d 15 974 * ---+--+-+---> scope 975 * | 976 * | d is scope of the destination. 977 * B-d | \ 978 * | \ <- smaller scope is better if 979 * B-15 | \ if scope is enough for destinaion. 980 * | ret = B - scope (-1 <= scope >= d <= 15). 981 * d-C-1 | / 982 * |/ <- greater is better 983 * -C / if scope is not enough for destination. 984 * /| ret = scope - C (-1 <= d < scope <= 15). 985 * 986 * d - C - 1 < B -15 (for all -1 <= d <= 15). 987 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 988 * Assume B = 0 and we get C > 29. 989 */ 990 ret = __ipv6_addr_src_scope(score->addr_type); 991 if (ret >= dst->scope) 992 ret = -ret; 993 else 994 ret -= 128; /* 30 is enough */ 995 score->scopedist = ret; 996 break; 997 case IPV6_SADDR_RULE_PREFERRED: 998 /* Rule 3: Avoid deprecated and optimistic addresses */ 999 ret = ipv6_saddr_preferred(score->addr_type) || 1000 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1001 break; 1002 #ifdef CONFIG_IPV6_MIP6 1003 case IPV6_SADDR_RULE_HOA: 1004 { 1005 /* Rule 4: Prefer home address */ 1006 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1007 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1008 break; 1009 } 1010 #endif 1011 case IPV6_SADDR_RULE_OIF: 1012 /* Rule 5: Prefer outgoing interface */ 1013 ret = (!dst->ifindex || 1014 dst->ifindex == score->ifa->idev->dev->ifindex); 1015 break; 1016 case IPV6_SADDR_RULE_LABEL: 1017 /* Rule 6: Prefer matching label */ 1018 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type, 1019 score->ifa->idev->dev->ifindex) == dst->label; 1020 break; 1021 #ifdef CONFIG_IPV6_PRIVACY 1022 case IPV6_SADDR_RULE_PRIVACY: 1023 { 1024 /* Rule 7: Prefer public address 1025 * Note: prefer temprary address if use_tempaddr >= 2 1026 */ 1027 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1028 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1029 score->ifa->idev->cnf.use_tempaddr >= 2; 1030 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1031 break; 1032 } 1033 #endif 1034 case IPV6_SADDR_RULE_ORCHID: 1035 /* Rule 8-: Prefer ORCHID vs ORCHID or 1036 * non-ORCHID vs non-ORCHID 1037 */ 1038 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1039 ipv6_addr_orchid(dst->addr)); 1040 break; 1041 case IPV6_SADDR_RULE_PREFIX: 1042 /* Rule 8: Use longest matching prefix */ 1043 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1044 dst->addr); 1045 break; 1046 default: 1047 ret = 0; 1048 } 1049 1050 if (ret) 1051 __set_bit(i, score->scorebits); 1052 score->rule = i; 1053 out: 1054 return ret; 1055 } 1056 1057 int ipv6_dev_get_saddr(struct net_device *dst_dev, 1058 struct in6_addr *daddr, unsigned int prefs, 1059 struct in6_addr *saddr) 1060 { 1061 struct ipv6_saddr_score scores[2], 1062 *score = &scores[0], *hiscore = &scores[1]; 1063 struct net *net = dev_net(dst_dev); 1064 struct ipv6_saddr_dst dst; 1065 struct net_device *dev; 1066 int dst_type; 1067 1068 dst_type = __ipv6_addr_type(daddr); 1069 dst.addr = daddr; 1070 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1071 dst.scope = __ipv6_addr_src_scope(dst_type); 1072 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex); 1073 dst.prefs = prefs; 1074 1075 hiscore->rule = -1; 1076 hiscore->ifa = NULL; 1077 1078 read_lock(&dev_base_lock); 1079 rcu_read_lock(); 1080 1081 for_each_netdev(net, dev) { 1082 struct inet6_dev *idev; 1083 1084 /* Candidate Source Address (section 4) 1085 * - multicast and link-local destination address, 1086 * the set of candidate source address MUST only 1087 * include addresses assigned to interfaces 1088 * belonging to the same link as the outgoing 1089 * interface. 1090 * (- For site-local destination addresses, the 1091 * set of candidate source addresses MUST only 1092 * include addresses assigned to interfaces 1093 * belonging to the same site as the outgoing 1094 * interface.) 1095 */ 1096 if (((dst_type & IPV6_ADDR_MULTICAST) || 1097 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1098 dst.ifindex && dev->ifindex != dst.ifindex) 1099 continue; 1100 1101 idev = __in6_dev_get(dev); 1102 if (!idev) 1103 continue; 1104 1105 read_lock_bh(&idev->lock); 1106 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) { 1107 int i; 1108 1109 /* 1110 * - Tentative Address (RFC2462 section 5.4) 1111 * - A tentative address is not considered 1112 * "assigned to an interface" in the traditional 1113 * sense, unless it is also flagged as optimistic. 1114 * - Candidate Source Address (section 4) 1115 * - In any case, anycast addresses, multicast 1116 * addresses, and the unspecified address MUST 1117 * NOT be included in a candidate set. 1118 */ 1119 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1120 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1121 continue; 1122 1123 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1124 1125 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1126 score->addr_type & IPV6_ADDR_MULTICAST)) { 1127 LIMIT_NETDEBUG(KERN_DEBUG 1128 "ADDRCONF: unspecified / multicast address " 1129 "assigned as unicast address on %s", 1130 dev->name); 1131 continue; 1132 } 1133 1134 score->rule = -1; 1135 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1136 1137 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1138 int minihiscore, miniscore; 1139 1140 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i); 1141 miniscore = ipv6_get_saddr_eval(score, &dst, i); 1142 1143 if (minihiscore > miniscore) { 1144 if (i == IPV6_SADDR_RULE_SCOPE && 1145 score->scopedist > 0) { 1146 /* 1147 * special case: 1148 * each remaining entry 1149 * has too small (not enough) 1150 * scope, because ifa entries 1151 * are sorted by their scope 1152 * values. 1153 */ 1154 goto try_nextdev; 1155 } 1156 break; 1157 } else if (minihiscore < miniscore) { 1158 struct ipv6_saddr_score *tmp; 1159 1160 if (hiscore->ifa) 1161 in6_ifa_put(hiscore->ifa); 1162 1163 in6_ifa_hold(score->ifa); 1164 1165 tmp = hiscore; 1166 hiscore = score; 1167 score = tmp; 1168 1169 /* restore our iterator */ 1170 score->ifa = hiscore->ifa; 1171 1172 break; 1173 } 1174 } 1175 } 1176 try_nextdev: 1177 read_unlock_bh(&idev->lock); 1178 } 1179 rcu_read_unlock(); 1180 read_unlock(&dev_base_lock); 1181 1182 if (!hiscore->ifa) 1183 return -EADDRNOTAVAIL; 1184 1185 ipv6_addr_copy(saddr, &hiscore->ifa->addr); 1186 in6_ifa_put(hiscore->ifa); 1187 return 0; 1188 } 1189 1190 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1191 1192 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1193 unsigned char banned_flags) 1194 { 1195 struct inet6_dev *idev; 1196 int err = -EADDRNOTAVAIL; 1197 1198 rcu_read_lock(); 1199 if ((idev = __in6_dev_get(dev)) != NULL) { 1200 struct inet6_ifaddr *ifp; 1201 1202 read_lock_bh(&idev->lock); 1203 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1204 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1205 ipv6_addr_copy(addr, &ifp->addr); 1206 err = 0; 1207 break; 1208 } 1209 } 1210 read_unlock_bh(&idev->lock); 1211 } 1212 rcu_read_unlock(); 1213 return err; 1214 } 1215 1216 static int ipv6_count_addresses(struct inet6_dev *idev) 1217 { 1218 int cnt = 0; 1219 struct inet6_ifaddr *ifp; 1220 1221 read_lock_bh(&idev->lock); 1222 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1223 cnt++; 1224 read_unlock_bh(&idev->lock); 1225 return cnt; 1226 } 1227 1228 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1229 struct net_device *dev, int strict) 1230 { 1231 struct inet6_ifaddr * ifp; 1232 u8 hash = ipv6_addr_hash(addr); 1233 1234 read_lock_bh(&addrconf_hash_lock); 1235 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1236 if (!net_eq(dev_net(ifp->idev->dev), net)) 1237 continue; 1238 if (ipv6_addr_equal(&ifp->addr, addr) && 1239 !(ifp->flags&IFA_F_TENTATIVE)) { 1240 if (dev == NULL || ifp->idev->dev == dev || 1241 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1242 break; 1243 } 1244 } 1245 read_unlock_bh(&addrconf_hash_lock); 1246 return ifp != NULL; 1247 } 1248 EXPORT_SYMBOL(ipv6_chk_addr); 1249 1250 static 1251 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1252 struct net_device *dev) 1253 { 1254 struct inet6_ifaddr * ifp; 1255 u8 hash = ipv6_addr_hash(addr); 1256 1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1258 if (!net_eq(dev_net(ifp->idev->dev), net)) 1259 continue; 1260 if (ipv6_addr_equal(&ifp->addr, addr)) { 1261 if (dev == NULL || ifp->idev->dev == dev) 1262 break; 1263 } 1264 } 1265 return ifp != NULL; 1266 } 1267 1268 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr, 1269 struct net_device *dev, int strict) 1270 { 1271 struct inet6_ifaddr * ifp; 1272 u8 hash = ipv6_addr_hash(addr); 1273 1274 read_lock_bh(&addrconf_hash_lock); 1275 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1276 if (!net_eq(dev_net(ifp->idev->dev), net)) 1277 continue; 1278 if (ipv6_addr_equal(&ifp->addr, addr)) { 1279 if (dev == NULL || ifp->idev->dev == dev || 1280 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1281 in6_ifa_hold(ifp); 1282 break; 1283 } 1284 } 1285 } 1286 read_unlock_bh(&addrconf_hash_lock); 1287 1288 return ifp; 1289 } 1290 1291 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1292 { 1293 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1294 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1295 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1296 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1297 int sk_ipv6only = ipv6_only_sock(sk); 1298 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1299 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1300 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1301 1302 if (!sk2_rcv_saddr && !sk_ipv6only) 1303 return 1; 1304 1305 if (addr_type2 == IPV6_ADDR_ANY && 1306 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1307 return 1; 1308 1309 if (addr_type == IPV6_ADDR_ANY && 1310 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1311 return 1; 1312 1313 if (sk2_rcv_saddr6 && 1314 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1315 return 1; 1316 1317 if (addr_type == IPV6_ADDR_MAPPED && 1318 !sk2_ipv6only && 1319 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1320 return 1; 1321 1322 return 0; 1323 } 1324 1325 /* Gets referenced address, destroys ifaddr */ 1326 1327 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1328 { 1329 if (ifp->flags&IFA_F_PERMANENT) { 1330 spin_lock_bh(&ifp->lock); 1331 addrconf_del_timer(ifp); 1332 ifp->flags |= IFA_F_TENTATIVE; 1333 spin_unlock_bh(&ifp->lock); 1334 in6_ifa_put(ifp); 1335 #ifdef CONFIG_IPV6_PRIVACY 1336 } else if (ifp->flags&IFA_F_TEMPORARY) { 1337 struct inet6_ifaddr *ifpub; 1338 spin_lock_bh(&ifp->lock); 1339 ifpub = ifp->ifpub; 1340 if (ifpub) { 1341 in6_ifa_hold(ifpub); 1342 spin_unlock_bh(&ifp->lock); 1343 ipv6_create_tempaddr(ifpub, ifp); 1344 in6_ifa_put(ifpub); 1345 } else { 1346 spin_unlock_bh(&ifp->lock); 1347 } 1348 ipv6_del_addr(ifp); 1349 #endif 1350 } else 1351 ipv6_del_addr(ifp); 1352 } 1353 1354 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1355 { 1356 if (net_ratelimit()) 1357 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1358 addrconf_dad_stop(ifp); 1359 } 1360 1361 /* Join to solicited addr multicast group. */ 1362 1363 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1364 { 1365 struct in6_addr maddr; 1366 1367 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1368 return; 1369 1370 addrconf_addr_solict_mult(addr, &maddr); 1371 ipv6_dev_mc_inc(dev, &maddr); 1372 } 1373 1374 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1375 { 1376 struct in6_addr maddr; 1377 1378 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1379 return; 1380 1381 addrconf_addr_solict_mult(addr, &maddr); 1382 __ipv6_dev_mc_dec(idev, &maddr); 1383 } 1384 1385 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1386 { 1387 struct in6_addr addr; 1388 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1389 if (ipv6_addr_any(&addr)) 1390 return; 1391 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1392 } 1393 1394 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1395 { 1396 struct in6_addr addr; 1397 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1398 if (ipv6_addr_any(&addr)) 1399 return; 1400 __ipv6_dev_ac_dec(ifp->idev, &addr); 1401 } 1402 1403 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1404 { 1405 if (dev->addr_len != ETH_ALEN) 1406 return -1; 1407 memcpy(eui, dev->dev_addr, 3); 1408 memcpy(eui + 5, dev->dev_addr + 3, 3); 1409 1410 /* 1411 * The zSeries OSA network cards can be shared among various 1412 * OS instances, but the OSA cards have only one MAC address. 1413 * This leads to duplicate address conflicts in conjunction 1414 * with IPv6 if more than one instance uses the same card. 1415 * 1416 * The driver for these cards can deliver a unique 16-bit 1417 * identifier for each instance sharing the same card. It is 1418 * placed instead of 0xFFFE in the interface identifier. The 1419 * "u" bit of the interface identifier is not inverted in this 1420 * case. Hence the resulting interface identifier has local 1421 * scope according to RFC2373. 1422 */ 1423 if (dev->dev_id) { 1424 eui[3] = (dev->dev_id >> 8) & 0xFF; 1425 eui[4] = dev->dev_id & 0xFF; 1426 } else { 1427 eui[3] = 0xFF; 1428 eui[4] = 0xFE; 1429 eui[0] ^= 2; 1430 } 1431 return 0; 1432 } 1433 1434 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1435 { 1436 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1437 if (dev->addr_len != ARCNET_ALEN) 1438 return -1; 1439 memset(eui, 0, 7); 1440 eui[7] = *(u8*)dev->dev_addr; 1441 return 0; 1442 } 1443 1444 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1445 { 1446 if (dev->addr_len != INFINIBAND_ALEN) 1447 return -1; 1448 memcpy(eui, dev->dev_addr + 12, 8); 1449 eui[0] |= 2; 1450 return 0; 1451 } 1452 1453 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1454 { 1455 switch (dev->type) { 1456 case ARPHRD_ETHER: 1457 case ARPHRD_FDDI: 1458 case ARPHRD_IEEE802_TR: 1459 return addrconf_ifid_eui48(eui, dev); 1460 case ARPHRD_ARCNET: 1461 return addrconf_ifid_arcnet(eui, dev); 1462 case ARPHRD_INFINIBAND: 1463 return addrconf_ifid_infiniband(eui, dev); 1464 case ARPHRD_SIT: 1465 if (dev->priv_flags & IFF_ISATAP) 1466 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr); 1467 } 1468 return -1; 1469 } 1470 1471 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1472 { 1473 int err = -1; 1474 struct inet6_ifaddr *ifp; 1475 1476 read_lock_bh(&idev->lock); 1477 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1478 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1479 memcpy(eui, ifp->addr.s6_addr+8, 8); 1480 err = 0; 1481 break; 1482 } 1483 } 1484 read_unlock_bh(&idev->lock); 1485 return err; 1486 } 1487 1488 #ifdef CONFIG_IPV6_PRIVACY 1489 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1490 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1491 { 1492 regen: 1493 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1494 idev->rndid[0] &= ~0x02; 1495 1496 /* 1497 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1498 * check if generated address is not inappropriate 1499 * 1500 * - Reserved subnet anycast (RFC 2526) 1501 * 11111101 11....11 1xxxxxxx 1502 * - ISATAP (RFC4214) 6.1 1503 * 00-00-5E-FE-xx-xx-xx-xx 1504 * - value 0 1505 * - XXX: already assigned to an address on the device 1506 */ 1507 if (idev->rndid[0] == 0xfd && 1508 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1509 (idev->rndid[7]&0x80)) 1510 goto regen; 1511 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1512 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1513 goto regen; 1514 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1515 goto regen; 1516 } 1517 1518 return 0; 1519 } 1520 1521 static void ipv6_regen_rndid(unsigned long data) 1522 { 1523 struct inet6_dev *idev = (struct inet6_dev *) data; 1524 unsigned long expires; 1525 1526 rcu_read_lock_bh(); 1527 write_lock_bh(&idev->lock); 1528 1529 if (idev->dead) 1530 goto out; 1531 1532 if (__ipv6_regen_rndid(idev) < 0) 1533 goto out; 1534 1535 expires = jiffies + 1536 idev->cnf.temp_prefered_lft * HZ - 1537 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1538 if (time_before(expires, jiffies)) { 1539 printk(KERN_WARNING 1540 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1541 idev->dev->name); 1542 goto out; 1543 } 1544 1545 if (!mod_timer(&idev->regen_timer, expires)) 1546 in6_dev_hold(idev); 1547 1548 out: 1549 write_unlock_bh(&idev->lock); 1550 rcu_read_unlock_bh(); 1551 in6_dev_put(idev); 1552 } 1553 1554 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1555 int ret = 0; 1556 1557 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1558 ret = __ipv6_regen_rndid(idev); 1559 return ret; 1560 } 1561 #endif 1562 1563 /* 1564 * Add prefix route. 1565 */ 1566 1567 static void 1568 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1569 unsigned long expires, u32 flags) 1570 { 1571 struct fib6_config cfg = { 1572 .fc_table = RT6_TABLE_PREFIX, 1573 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1574 .fc_ifindex = dev->ifindex, 1575 .fc_expires = expires, 1576 .fc_dst_len = plen, 1577 .fc_flags = RTF_UP | flags, 1578 .fc_nlinfo.nl_net = dev_net(dev), 1579 }; 1580 1581 ipv6_addr_copy(&cfg.fc_dst, pfx); 1582 1583 /* Prevent useless cloning on PtP SIT. 1584 This thing is done here expecting that the whole 1585 class of non-broadcast devices need not cloning. 1586 */ 1587 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1588 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1589 cfg.fc_flags |= RTF_NONEXTHOP; 1590 #endif 1591 1592 ip6_route_add(&cfg); 1593 } 1594 1595 /* Create "default" multicast route to the interface */ 1596 1597 static void addrconf_add_mroute(struct net_device *dev) 1598 { 1599 struct fib6_config cfg = { 1600 .fc_table = RT6_TABLE_LOCAL, 1601 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1602 .fc_ifindex = dev->ifindex, 1603 .fc_dst_len = 8, 1604 .fc_flags = RTF_UP, 1605 .fc_nlinfo.nl_net = dev_net(dev), 1606 }; 1607 1608 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1609 1610 ip6_route_add(&cfg); 1611 } 1612 1613 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1614 static void sit_route_add(struct net_device *dev) 1615 { 1616 struct fib6_config cfg = { 1617 .fc_table = RT6_TABLE_MAIN, 1618 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1619 .fc_ifindex = dev->ifindex, 1620 .fc_dst_len = 96, 1621 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1622 .fc_nlinfo.nl_net = dev_net(dev), 1623 }; 1624 1625 /* prefix length - 96 bits "::d.d.d.d" */ 1626 ip6_route_add(&cfg); 1627 } 1628 #endif 1629 1630 static void addrconf_add_lroute(struct net_device *dev) 1631 { 1632 struct in6_addr addr; 1633 1634 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1635 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1636 } 1637 1638 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1639 { 1640 struct inet6_dev *idev; 1641 1642 ASSERT_RTNL(); 1643 1644 if ((idev = ipv6_find_idev(dev)) == NULL) 1645 return NULL; 1646 1647 /* Add default multicast route */ 1648 addrconf_add_mroute(dev); 1649 1650 /* Add link local route */ 1651 addrconf_add_lroute(dev); 1652 return idev; 1653 } 1654 1655 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1656 { 1657 struct prefix_info *pinfo; 1658 __u32 valid_lft; 1659 __u32 prefered_lft; 1660 int addr_type; 1661 unsigned long rt_expires; 1662 struct inet6_dev *in6_dev; 1663 1664 pinfo = (struct prefix_info *) opt; 1665 1666 if (len < sizeof(struct prefix_info)) { 1667 ADBG(("addrconf: prefix option too short\n")); 1668 return; 1669 } 1670 1671 /* 1672 * Validation checks ([ADDRCONF], page 19) 1673 */ 1674 1675 addr_type = ipv6_addr_type(&pinfo->prefix); 1676 1677 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1678 return; 1679 1680 valid_lft = ntohl(pinfo->valid); 1681 prefered_lft = ntohl(pinfo->prefered); 1682 1683 if (prefered_lft > valid_lft) { 1684 if (net_ratelimit()) 1685 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1686 return; 1687 } 1688 1689 in6_dev = in6_dev_get(dev); 1690 1691 if (in6_dev == NULL) { 1692 if (net_ratelimit()) 1693 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1694 return; 1695 } 1696 1697 /* 1698 * Two things going on here: 1699 * 1) Add routes for on-link prefixes 1700 * 2) Configure prefixes with the auto flag set 1701 */ 1702 1703 /* Avoid arithmetic overflow. Really, we could 1704 save rt_expires in seconds, likely valid_lft, 1705 but it would require division in fib gc, that it 1706 not good. 1707 */ 1708 if (valid_lft >= 0x7FFFFFFF/HZ) 1709 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1710 else 1711 rt_expires = valid_lft * HZ; 1712 1713 /* 1714 * We convert this (in jiffies) to clock_t later. 1715 * Avoid arithmetic overflow there as well. 1716 * Overflow can happen only if HZ < USER_HZ. 1717 */ 1718 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1719 rt_expires = 0x7FFFFFFF / USER_HZ; 1720 1721 if (pinfo->onlink) { 1722 struct rt6_info *rt; 1723 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL, 1724 dev->ifindex, 1); 1725 1726 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1727 if (rt->rt6i_flags&RTF_EXPIRES) { 1728 if (valid_lft == 0) { 1729 ip6_del_rt(rt); 1730 rt = NULL; 1731 } else { 1732 rt->rt6i_expires = jiffies + rt_expires; 1733 } 1734 } 1735 } else if (valid_lft) { 1736 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1737 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1738 } 1739 if (rt) 1740 dst_release(&rt->u.dst); 1741 } 1742 1743 /* Try to figure out our local address for this prefix */ 1744 1745 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1746 struct inet6_ifaddr * ifp; 1747 struct in6_addr addr; 1748 int create = 0, update_lft = 0; 1749 1750 if (pinfo->prefix_len == 64) { 1751 memcpy(&addr, &pinfo->prefix, 8); 1752 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1753 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1754 in6_dev_put(in6_dev); 1755 return; 1756 } 1757 goto ok; 1758 } 1759 if (net_ratelimit()) 1760 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1761 pinfo->prefix_len); 1762 in6_dev_put(in6_dev); 1763 return; 1764 1765 ok: 1766 1767 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1); 1768 1769 if (ifp == NULL && valid_lft) { 1770 int max_addresses = in6_dev->cnf.max_addresses; 1771 u32 addr_flags = 0; 1772 1773 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1774 if (in6_dev->cnf.optimistic_dad && 1775 !ipv6_devconf.forwarding) 1776 addr_flags = IFA_F_OPTIMISTIC; 1777 #endif 1778 1779 /* Do not allow to create too much of autoconfigured 1780 * addresses; this would be too easy way to crash kernel. 1781 */ 1782 if (!max_addresses || 1783 ipv6_count_addresses(in6_dev) < max_addresses) 1784 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1785 addr_type&IPV6_ADDR_SCOPE_MASK, 1786 addr_flags); 1787 1788 if (!ifp || IS_ERR(ifp)) { 1789 in6_dev_put(in6_dev); 1790 return; 1791 } 1792 1793 update_lft = create = 1; 1794 ifp->cstamp = jiffies; 1795 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1796 } 1797 1798 if (ifp) { 1799 int flags; 1800 unsigned long now; 1801 #ifdef CONFIG_IPV6_PRIVACY 1802 struct inet6_ifaddr *ift; 1803 #endif 1804 u32 stored_lft; 1805 1806 /* update lifetime (RFC2462 5.5.3 e) */ 1807 spin_lock(&ifp->lock); 1808 now = jiffies; 1809 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1810 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1811 else 1812 stored_lft = 0; 1813 if (!update_lft && stored_lft) { 1814 if (valid_lft > MIN_VALID_LIFETIME || 1815 valid_lft > stored_lft) 1816 update_lft = 1; 1817 else if (stored_lft <= MIN_VALID_LIFETIME) { 1818 /* valid_lft <= stored_lft is always true */ 1819 /* XXX: IPsec */ 1820 update_lft = 0; 1821 } else { 1822 valid_lft = MIN_VALID_LIFETIME; 1823 if (valid_lft < prefered_lft) 1824 prefered_lft = valid_lft; 1825 update_lft = 1; 1826 } 1827 } 1828 1829 if (update_lft) { 1830 ifp->valid_lft = valid_lft; 1831 ifp->prefered_lft = prefered_lft; 1832 ifp->tstamp = now; 1833 flags = ifp->flags; 1834 ifp->flags &= ~IFA_F_DEPRECATED; 1835 spin_unlock(&ifp->lock); 1836 1837 if (!(flags&IFA_F_TENTATIVE)) 1838 ipv6_ifa_notify(0, ifp); 1839 } else 1840 spin_unlock(&ifp->lock); 1841 1842 #ifdef CONFIG_IPV6_PRIVACY 1843 read_lock_bh(&in6_dev->lock); 1844 /* update all temporary addresses in the list */ 1845 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1846 /* 1847 * When adjusting the lifetimes of an existing 1848 * temporary address, only lower the lifetimes. 1849 * Implementations must not increase the 1850 * lifetimes of an existing temporary address 1851 * when processing a Prefix Information Option. 1852 */ 1853 if (ifp != ift->ifpub) 1854 continue; 1855 1856 spin_lock(&ift->lock); 1857 flags = ift->flags; 1858 if (ift->valid_lft > valid_lft && 1859 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1860 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1861 if (ift->prefered_lft > prefered_lft && 1862 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1863 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1864 spin_unlock(&ift->lock); 1865 if (!(flags&IFA_F_TENTATIVE)) 1866 ipv6_ifa_notify(0, ift); 1867 } 1868 1869 if (create && in6_dev->cnf.use_tempaddr > 0) { 1870 /* 1871 * When a new public address is created as described in [ADDRCONF], 1872 * also create a new temporary address. 1873 */ 1874 read_unlock_bh(&in6_dev->lock); 1875 ipv6_create_tempaddr(ifp, NULL); 1876 } else { 1877 read_unlock_bh(&in6_dev->lock); 1878 } 1879 #endif 1880 in6_ifa_put(ifp); 1881 addrconf_verify(0); 1882 } 1883 } 1884 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1885 in6_dev_put(in6_dev); 1886 } 1887 1888 /* 1889 * Set destination address. 1890 * Special case for SIT interfaces where we create a new "virtual" 1891 * device. 1892 */ 1893 int addrconf_set_dstaddr(struct net *net, void __user *arg) 1894 { 1895 struct in6_ifreq ireq; 1896 struct net_device *dev; 1897 int err = -EINVAL; 1898 1899 rtnl_lock(); 1900 1901 err = -EFAULT; 1902 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1903 goto err_exit; 1904 1905 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 1906 1907 err = -ENODEV; 1908 if (dev == NULL) 1909 goto err_exit; 1910 1911 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1912 if (dev->type == ARPHRD_SIT) { 1913 struct ifreq ifr; 1914 mm_segment_t oldfs; 1915 struct ip_tunnel_parm p; 1916 1917 err = -EADDRNOTAVAIL; 1918 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1919 goto err_exit; 1920 1921 memset(&p, 0, sizeof(p)); 1922 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1923 p.iph.saddr = 0; 1924 p.iph.version = 4; 1925 p.iph.ihl = 5; 1926 p.iph.protocol = IPPROTO_IPV6; 1927 p.iph.ttl = 64; 1928 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 1929 1930 oldfs = get_fs(); set_fs(KERNEL_DS); 1931 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1932 set_fs(oldfs); 1933 1934 if (err == 0) { 1935 err = -ENOBUFS; 1936 dev = __dev_get_by_name(net, p.name); 1937 if (!dev) 1938 goto err_exit; 1939 err = dev_open(dev); 1940 } 1941 } 1942 #endif 1943 1944 err_exit: 1945 rtnl_unlock(); 1946 return err; 1947 } 1948 1949 /* 1950 * Manual configuration of address on an interface 1951 */ 1952 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx, 1953 int plen, __u8 ifa_flags, __u32 prefered_lft, 1954 __u32 valid_lft) 1955 { 1956 struct inet6_ifaddr *ifp; 1957 struct inet6_dev *idev; 1958 struct net_device *dev; 1959 int scope; 1960 u32 flags = RTF_EXPIRES; 1961 1962 ASSERT_RTNL(); 1963 1964 /* check the lifetime */ 1965 if (!valid_lft || prefered_lft > valid_lft) 1966 return -EINVAL; 1967 1968 dev = __dev_get_by_index(net, ifindex); 1969 if (!dev) 1970 return -ENODEV; 1971 1972 if ((idev = addrconf_add_dev(dev)) == NULL) 1973 return -ENOBUFS; 1974 1975 scope = ipv6_addr_scope(pfx); 1976 1977 if (valid_lft == INFINITY_LIFE_TIME) { 1978 ifa_flags |= IFA_F_PERMANENT; 1979 flags = 0; 1980 } else if (valid_lft >= 0x7FFFFFFF/HZ) 1981 valid_lft = 0x7FFFFFFF/HZ; 1982 1983 if (prefered_lft == 0) 1984 ifa_flags |= IFA_F_DEPRECATED; 1985 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1986 (prefered_lft != INFINITY_LIFE_TIME)) 1987 prefered_lft = 0x7FFFFFFF/HZ; 1988 1989 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1990 1991 if (!IS_ERR(ifp)) { 1992 spin_lock_bh(&ifp->lock); 1993 ifp->valid_lft = valid_lft; 1994 ifp->prefered_lft = prefered_lft; 1995 ifp->tstamp = jiffies; 1996 spin_unlock_bh(&ifp->lock); 1997 1998 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 1999 jiffies_to_clock_t(valid_lft * HZ), flags); 2000 /* 2001 * Note that section 3.1 of RFC 4429 indicates 2002 * that the Optimistic flag should not be set for 2003 * manually configured addresses 2004 */ 2005 addrconf_dad_start(ifp, 0); 2006 in6_ifa_put(ifp); 2007 addrconf_verify(0); 2008 return 0; 2009 } 2010 2011 return PTR_ERR(ifp); 2012 } 2013 2014 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx, 2015 int plen) 2016 { 2017 struct inet6_ifaddr *ifp; 2018 struct inet6_dev *idev; 2019 struct net_device *dev; 2020 2021 dev = __dev_get_by_index(net, ifindex); 2022 if (!dev) 2023 return -ENODEV; 2024 2025 if ((idev = __in6_dev_get(dev)) == NULL) 2026 return -ENXIO; 2027 2028 read_lock_bh(&idev->lock); 2029 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2030 if (ifp->prefix_len == plen && 2031 ipv6_addr_equal(pfx, &ifp->addr)) { 2032 in6_ifa_hold(ifp); 2033 read_unlock_bh(&idev->lock); 2034 2035 ipv6_del_addr(ifp); 2036 2037 /* If the last address is deleted administratively, 2038 disable IPv6 on this interface. 2039 */ 2040 if (idev->addr_list == NULL) 2041 addrconf_ifdown(idev->dev, 1); 2042 return 0; 2043 } 2044 } 2045 read_unlock_bh(&idev->lock); 2046 return -EADDRNOTAVAIL; 2047 } 2048 2049 2050 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2051 { 2052 struct in6_ifreq ireq; 2053 int err; 2054 2055 if (!capable(CAP_NET_ADMIN)) 2056 return -EPERM; 2057 2058 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2059 return -EFAULT; 2060 2061 rtnl_lock(); 2062 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2063 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2064 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2065 rtnl_unlock(); 2066 return err; 2067 } 2068 2069 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2070 { 2071 struct in6_ifreq ireq; 2072 int err; 2073 2074 if (!capable(CAP_NET_ADMIN)) 2075 return -EPERM; 2076 2077 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2078 return -EFAULT; 2079 2080 rtnl_lock(); 2081 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2082 ireq.ifr6_prefixlen); 2083 rtnl_unlock(); 2084 return err; 2085 } 2086 2087 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2088 static void sit_add_v4_addrs(struct inet6_dev *idev) 2089 { 2090 struct inet6_ifaddr * ifp; 2091 struct in6_addr addr; 2092 struct net_device *dev; 2093 struct net *net = dev_net(idev->dev); 2094 int scope; 2095 2096 ASSERT_RTNL(); 2097 2098 memset(&addr, 0, sizeof(struct in6_addr)); 2099 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2100 2101 if (idev->dev->flags&IFF_POINTOPOINT) { 2102 addr.s6_addr32[0] = htonl(0xfe800000); 2103 scope = IFA_LINK; 2104 } else { 2105 scope = IPV6_ADDR_COMPATv4; 2106 } 2107 2108 if (addr.s6_addr32[3]) { 2109 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2110 if (!IS_ERR(ifp)) { 2111 spin_lock_bh(&ifp->lock); 2112 ifp->flags &= ~IFA_F_TENTATIVE; 2113 spin_unlock_bh(&ifp->lock); 2114 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2115 in6_ifa_put(ifp); 2116 } 2117 return; 2118 } 2119 2120 for_each_netdev(net, dev) { 2121 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2122 if (in_dev && (dev->flags & IFF_UP)) { 2123 struct in_ifaddr * ifa; 2124 2125 int flag = scope; 2126 2127 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2128 int plen; 2129 2130 addr.s6_addr32[3] = ifa->ifa_local; 2131 2132 if (ifa->ifa_scope == RT_SCOPE_LINK) 2133 continue; 2134 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2135 if (idev->dev->flags&IFF_POINTOPOINT) 2136 continue; 2137 flag |= IFA_HOST; 2138 } 2139 if (idev->dev->flags&IFF_POINTOPOINT) 2140 plen = 64; 2141 else 2142 plen = 96; 2143 2144 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2145 IFA_F_PERMANENT); 2146 if (!IS_ERR(ifp)) { 2147 spin_lock_bh(&ifp->lock); 2148 ifp->flags &= ~IFA_F_TENTATIVE; 2149 spin_unlock_bh(&ifp->lock); 2150 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2151 in6_ifa_put(ifp); 2152 } 2153 } 2154 } 2155 } 2156 } 2157 #endif 2158 2159 static void init_loopback(struct net_device *dev) 2160 { 2161 struct inet6_dev *idev; 2162 struct inet6_ifaddr * ifp; 2163 2164 /* ::1 */ 2165 2166 ASSERT_RTNL(); 2167 2168 if ((idev = ipv6_find_idev(dev)) == NULL) { 2169 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2170 return; 2171 } 2172 2173 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2174 if (!IS_ERR(ifp)) { 2175 spin_lock_bh(&ifp->lock); 2176 ifp->flags &= ~IFA_F_TENTATIVE; 2177 spin_unlock_bh(&ifp->lock); 2178 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2179 in6_ifa_put(ifp); 2180 } 2181 } 2182 2183 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2184 { 2185 struct inet6_ifaddr * ifp; 2186 u32 addr_flags = IFA_F_PERMANENT; 2187 2188 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2189 if (idev->cnf.optimistic_dad && 2190 !ipv6_devconf.forwarding) 2191 addr_flags |= IFA_F_OPTIMISTIC; 2192 #endif 2193 2194 2195 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2196 if (!IS_ERR(ifp)) { 2197 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2198 addrconf_dad_start(ifp, 0); 2199 in6_ifa_put(ifp); 2200 } 2201 } 2202 2203 static void addrconf_dev_config(struct net_device *dev) 2204 { 2205 struct in6_addr addr; 2206 struct inet6_dev * idev; 2207 2208 ASSERT_RTNL(); 2209 2210 if ((dev->type != ARPHRD_ETHER) && 2211 (dev->type != ARPHRD_FDDI) && 2212 (dev->type != ARPHRD_IEEE802_TR) && 2213 (dev->type != ARPHRD_ARCNET) && 2214 (dev->type != ARPHRD_INFINIBAND)) { 2215 /* Alas, we support only Ethernet autoconfiguration. */ 2216 return; 2217 } 2218 2219 idev = addrconf_add_dev(dev); 2220 if (idev == NULL) 2221 return; 2222 2223 memset(&addr, 0, sizeof(struct in6_addr)); 2224 addr.s6_addr32[0] = htonl(0xFE800000); 2225 2226 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2227 addrconf_add_linklocal(idev, &addr); 2228 } 2229 2230 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2231 static void addrconf_sit_config(struct net_device *dev) 2232 { 2233 struct inet6_dev *idev; 2234 2235 ASSERT_RTNL(); 2236 2237 /* 2238 * Configure the tunnel with one of our IPv4 2239 * addresses... we should configure all of 2240 * our v4 addrs in the tunnel 2241 */ 2242 2243 if ((idev = ipv6_find_idev(dev)) == NULL) { 2244 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2245 return; 2246 } 2247 2248 if (dev->priv_flags & IFF_ISATAP) { 2249 struct in6_addr addr; 2250 2251 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2252 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2253 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2254 addrconf_add_linklocal(idev, &addr); 2255 return; 2256 } 2257 2258 sit_add_v4_addrs(idev); 2259 2260 if (dev->flags&IFF_POINTOPOINT) { 2261 addrconf_add_mroute(dev); 2262 addrconf_add_lroute(dev); 2263 } else 2264 sit_route_add(dev); 2265 } 2266 #endif 2267 2268 static inline int 2269 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2270 { 2271 struct in6_addr lladdr; 2272 2273 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2274 addrconf_add_linklocal(idev, &lladdr); 2275 return 0; 2276 } 2277 return -1; 2278 } 2279 2280 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2281 { 2282 struct net_device *link_dev; 2283 struct net *net = dev_net(idev->dev); 2284 2285 /* first try to inherit the link-local address from the link device */ 2286 if (idev->dev->iflink && 2287 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2288 if (!ipv6_inherit_linklocal(idev, link_dev)) 2289 return; 2290 } 2291 /* then try to inherit it from any device */ 2292 for_each_netdev(net, link_dev) { 2293 if (!ipv6_inherit_linklocal(idev, link_dev)) 2294 return; 2295 } 2296 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2297 } 2298 2299 /* 2300 * Autoconfigure tunnel with a link-local address so routing protocols, 2301 * DHCPv6, MLD etc. can be run over the virtual link 2302 */ 2303 2304 static void addrconf_ip6_tnl_config(struct net_device *dev) 2305 { 2306 struct inet6_dev *idev; 2307 2308 ASSERT_RTNL(); 2309 2310 if ((idev = addrconf_add_dev(dev)) == NULL) { 2311 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2312 return; 2313 } 2314 ip6_tnl_add_linklocal(idev); 2315 } 2316 2317 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2318 void * data) 2319 { 2320 struct net_device *dev = (struct net_device *) data; 2321 struct inet6_dev *idev = __in6_dev_get(dev); 2322 int run_pending = 0; 2323 int err; 2324 2325 switch(event) { 2326 case NETDEV_REGISTER: 2327 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2328 idev = ipv6_add_dev(dev); 2329 if (!idev) 2330 return notifier_from_errno(-ENOMEM); 2331 } 2332 break; 2333 case NETDEV_UP: 2334 case NETDEV_CHANGE: 2335 if (dev->flags & IFF_SLAVE) 2336 break; 2337 2338 if (event == NETDEV_UP) { 2339 if (!addrconf_qdisc_ok(dev)) { 2340 /* device is not ready yet. */ 2341 printk(KERN_INFO 2342 "ADDRCONF(NETDEV_UP): %s: " 2343 "link is not ready\n", 2344 dev->name); 2345 break; 2346 } 2347 2348 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2349 idev = ipv6_add_dev(dev); 2350 2351 if (idev) 2352 idev->if_flags |= IF_READY; 2353 } else { 2354 if (!addrconf_qdisc_ok(dev)) { 2355 /* device is still not ready. */ 2356 break; 2357 } 2358 2359 if (idev) { 2360 if (idev->if_flags & IF_READY) { 2361 /* device is already configured. */ 2362 break; 2363 } 2364 idev->if_flags |= IF_READY; 2365 } 2366 2367 printk(KERN_INFO 2368 "ADDRCONF(NETDEV_CHANGE): %s: " 2369 "link becomes ready\n", 2370 dev->name); 2371 2372 run_pending = 1; 2373 } 2374 2375 switch(dev->type) { 2376 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2377 case ARPHRD_SIT: 2378 addrconf_sit_config(dev); 2379 break; 2380 #endif 2381 case ARPHRD_TUNNEL6: 2382 addrconf_ip6_tnl_config(dev); 2383 break; 2384 case ARPHRD_LOOPBACK: 2385 init_loopback(dev); 2386 break; 2387 2388 default: 2389 addrconf_dev_config(dev); 2390 break; 2391 } 2392 if (idev) { 2393 if (run_pending) 2394 addrconf_dad_run(idev); 2395 2396 /* If the MTU changed during the interface down, when the 2397 interface up, the changed MTU must be reflected in the 2398 idev as well as routers. 2399 */ 2400 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2401 rt6_mtu_change(dev, dev->mtu); 2402 idev->cnf.mtu6 = dev->mtu; 2403 } 2404 idev->tstamp = jiffies; 2405 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2406 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2407 stop IPv6 on this interface. 2408 */ 2409 if (dev->mtu < IPV6_MIN_MTU) 2410 addrconf_ifdown(dev, event != NETDEV_DOWN); 2411 } 2412 break; 2413 2414 case NETDEV_CHANGEMTU: 2415 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2416 rt6_mtu_change(dev, dev->mtu); 2417 idev->cnf.mtu6 = dev->mtu; 2418 break; 2419 } 2420 2421 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2422 idev = ipv6_add_dev(dev); 2423 if (idev) 2424 break; 2425 } 2426 2427 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2428 2429 case NETDEV_DOWN: 2430 case NETDEV_UNREGISTER: 2431 /* 2432 * Remove all addresses from this interface. 2433 */ 2434 addrconf_ifdown(dev, event != NETDEV_DOWN); 2435 break; 2436 2437 case NETDEV_CHANGENAME: 2438 if (idev) { 2439 snmp6_unregister_dev(idev); 2440 addrconf_sysctl_unregister(idev); 2441 addrconf_sysctl_register(idev); 2442 err = snmp6_register_dev(idev); 2443 if (err) 2444 return notifier_from_errno(err); 2445 } 2446 break; 2447 } 2448 2449 return NOTIFY_OK; 2450 } 2451 2452 /* 2453 * addrconf module should be notified of a device going up 2454 */ 2455 static struct notifier_block ipv6_dev_notf = { 2456 .notifier_call = addrconf_notify, 2457 .priority = 0 2458 }; 2459 2460 static int addrconf_ifdown(struct net_device *dev, int how) 2461 { 2462 struct inet6_dev *idev; 2463 struct inet6_ifaddr *ifa, **bifa; 2464 struct net *net = dev_net(dev); 2465 int i; 2466 2467 ASSERT_RTNL(); 2468 2469 if (dev == init_net.loopback_dev && how == 1) 2470 how = 0; 2471 2472 rt6_ifdown(net, dev); 2473 neigh_ifdown(&nd_tbl, dev); 2474 2475 idev = __in6_dev_get(dev); 2476 if (idev == NULL) 2477 return -ENODEV; 2478 2479 /* Step 1: remove reference to ipv6 device from parent device. 2480 Do not dev_put! 2481 */ 2482 if (how == 1) { 2483 idev->dead = 1; 2484 2485 /* protected by rtnl_lock */ 2486 rcu_assign_pointer(dev->ip6_ptr, NULL); 2487 2488 /* Step 1.5: remove snmp6 entry */ 2489 snmp6_unregister_dev(idev); 2490 2491 } 2492 2493 /* Step 2: clear hash table */ 2494 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2495 bifa = &inet6_addr_lst[i]; 2496 2497 write_lock_bh(&addrconf_hash_lock); 2498 while ((ifa = *bifa) != NULL) { 2499 if (ifa->idev == idev) { 2500 *bifa = ifa->lst_next; 2501 ifa->lst_next = NULL; 2502 addrconf_del_timer(ifa); 2503 in6_ifa_put(ifa); 2504 continue; 2505 } 2506 bifa = &ifa->lst_next; 2507 } 2508 write_unlock_bh(&addrconf_hash_lock); 2509 } 2510 2511 write_lock_bh(&idev->lock); 2512 2513 /* Step 3: clear flags for stateless addrconf */ 2514 if (how != 1) 2515 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2516 2517 /* Step 4: clear address list */ 2518 #ifdef CONFIG_IPV6_PRIVACY 2519 if (how == 1 && del_timer(&idev->regen_timer)) 2520 in6_dev_put(idev); 2521 2522 /* clear tempaddr list */ 2523 while ((ifa = idev->tempaddr_list) != NULL) { 2524 idev->tempaddr_list = ifa->tmp_next; 2525 ifa->tmp_next = NULL; 2526 ifa->dead = 1; 2527 write_unlock_bh(&idev->lock); 2528 spin_lock_bh(&ifa->lock); 2529 2530 if (ifa->ifpub) { 2531 in6_ifa_put(ifa->ifpub); 2532 ifa->ifpub = NULL; 2533 } 2534 spin_unlock_bh(&ifa->lock); 2535 in6_ifa_put(ifa); 2536 write_lock_bh(&idev->lock); 2537 } 2538 #endif 2539 while ((ifa = idev->addr_list) != NULL) { 2540 idev->addr_list = ifa->if_next; 2541 ifa->if_next = NULL; 2542 ifa->dead = 1; 2543 addrconf_del_timer(ifa); 2544 write_unlock_bh(&idev->lock); 2545 2546 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2547 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2548 in6_ifa_put(ifa); 2549 2550 write_lock_bh(&idev->lock); 2551 } 2552 write_unlock_bh(&idev->lock); 2553 2554 /* Step 5: Discard multicast list */ 2555 2556 if (how == 1) 2557 ipv6_mc_destroy_dev(idev); 2558 else 2559 ipv6_mc_down(idev); 2560 2561 idev->tstamp = jiffies; 2562 2563 /* Shot the device (if unregistered) */ 2564 2565 if (how == 1) { 2566 addrconf_sysctl_unregister(idev); 2567 neigh_parms_release(&nd_tbl, idev->nd_parms); 2568 neigh_ifdown(&nd_tbl, dev); 2569 in6_dev_put(idev); 2570 } 2571 return 0; 2572 } 2573 2574 static void addrconf_rs_timer(unsigned long data) 2575 { 2576 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2577 2578 if (ifp->idev->cnf.forwarding) 2579 goto out; 2580 2581 if (ifp->idev->if_flags & IF_RA_RCVD) { 2582 /* 2583 * Announcement received after solicitation 2584 * was sent 2585 */ 2586 goto out; 2587 } 2588 2589 spin_lock(&ifp->lock); 2590 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2591 struct in6_addr all_routers; 2592 2593 /* The wait after the last probe can be shorter */ 2594 addrconf_mod_timer(ifp, AC_RS, 2595 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2596 ifp->idev->cnf.rtr_solicit_delay : 2597 ifp->idev->cnf.rtr_solicit_interval); 2598 spin_unlock(&ifp->lock); 2599 2600 ipv6_addr_all_routers(&all_routers); 2601 2602 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2603 } else { 2604 spin_unlock(&ifp->lock); 2605 /* 2606 * Note: we do not support deprecated "all on-link" 2607 * assumption any longer. 2608 */ 2609 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2610 ifp->idev->dev->name); 2611 } 2612 2613 out: 2614 in6_ifa_put(ifp); 2615 } 2616 2617 /* 2618 * Duplicate Address Detection 2619 */ 2620 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2621 { 2622 unsigned long rand_num; 2623 struct inet6_dev *idev = ifp->idev; 2624 2625 if (ifp->flags & IFA_F_OPTIMISTIC) 2626 rand_num = 0; 2627 else 2628 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2629 2630 ifp->probes = idev->cnf.dad_transmits; 2631 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2632 } 2633 2634 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2635 { 2636 struct inet6_dev *idev = ifp->idev; 2637 struct net_device *dev = idev->dev; 2638 2639 addrconf_join_solict(dev, &ifp->addr); 2640 2641 net_srandom(ifp->addr.s6_addr32[3]); 2642 2643 read_lock_bh(&idev->lock); 2644 if (ifp->dead) 2645 goto out; 2646 spin_lock_bh(&ifp->lock); 2647 2648 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2649 !(ifp->flags&IFA_F_TENTATIVE) || 2650 ifp->flags & IFA_F_NODAD) { 2651 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2652 spin_unlock_bh(&ifp->lock); 2653 read_unlock_bh(&idev->lock); 2654 2655 addrconf_dad_completed(ifp); 2656 return; 2657 } 2658 2659 if (!(idev->if_flags & IF_READY)) { 2660 spin_unlock_bh(&ifp->lock); 2661 read_unlock_bh(&idev->lock); 2662 /* 2663 * If the defice is not ready: 2664 * - keep it tentative if it is a permanent address. 2665 * - otherwise, kill it. 2666 */ 2667 in6_ifa_hold(ifp); 2668 addrconf_dad_stop(ifp); 2669 return; 2670 } 2671 2672 /* 2673 * Optimistic nodes can start receiving 2674 * Frames right away 2675 */ 2676 if(ifp->flags & IFA_F_OPTIMISTIC) 2677 ip6_ins_rt(ifp->rt); 2678 2679 addrconf_dad_kick(ifp); 2680 spin_unlock_bh(&ifp->lock); 2681 out: 2682 read_unlock_bh(&idev->lock); 2683 } 2684 2685 static void addrconf_dad_timer(unsigned long data) 2686 { 2687 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2688 struct inet6_dev *idev = ifp->idev; 2689 struct in6_addr unspec; 2690 struct in6_addr mcaddr; 2691 2692 read_lock_bh(&idev->lock); 2693 if (idev->dead) { 2694 read_unlock_bh(&idev->lock); 2695 goto out; 2696 } 2697 spin_lock_bh(&ifp->lock); 2698 if (ifp->probes == 0) { 2699 /* 2700 * DAD was successful 2701 */ 2702 2703 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2704 spin_unlock_bh(&ifp->lock); 2705 read_unlock_bh(&idev->lock); 2706 2707 addrconf_dad_completed(ifp); 2708 2709 goto out; 2710 } 2711 2712 ifp->probes--; 2713 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2714 spin_unlock_bh(&ifp->lock); 2715 read_unlock_bh(&idev->lock); 2716 2717 /* send a neighbour solicitation for our addr */ 2718 memset(&unspec, 0, sizeof(unspec)); 2719 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2720 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2721 out: 2722 in6_ifa_put(ifp); 2723 } 2724 2725 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2726 { 2727 struct net_device * dev = ifp->idev->dev; 2728 2729 /* 2730 * Configure the address for reception. Now it is valid. 2731 */ 2732 2733 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2734 2735 /* If added prefix is link local and forwarding is off, 2736 start sending router solicitations. 2737 */ 2738 2739 if (ifp->idev->cnf.forwarding == 0 && 2740 ifp->idev->cnf.rtr_solicits > 0 && 2741 (dev->flags&IFF_LOOPBACK) == 0 && 2742 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2743 struct in6_addr all_routers; 2744 2745 ipv6_addr_all_routers(&all_routers); 2746 2747 /* 2748 * If a host as already performed a random delay 2749 * [...] as part of DAD [...] there is no need 2750 * to delay again before sending the first RS 2751 */ 2752 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2753 2754 spin_lock_bh(&ifp->lock); 2755 ifp->probes = 1; 2756 ifp->idev->if_flags |= IF_RS_SENT; 2757 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2758 spin_unlock_bh(&ifp->lock); 2759 } 2760 } 2761 2762 static void addrconf_dad_run(struct inet6_dev *idev) { 2763 struct inet6_ifaddr *ifp; 2764 2765 read_lock_bh(&idev->lock); 2766 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2767 spin_lock_bh(&ifp->lock); 2768 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2769 spin_unlock_bh(&ifp->lock); 2770 continue; 2771 } 2772 spin_unlock_bh(&ifp->lock); 2773 addrconf_dad_kick(ifp); 2774 } 2775 read_unlock_bh(&idev->lock); 2776 } 2777 2778 #ifdef CONFIG_PROC_FS 2779 struct if6_iter_state { 2780 struct seq_net_private p; 2781 int bucket; 2782 }; 2783 2784 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2785 { 2786 struct inet6_ifaddr *ifa = NULL; 2787 struct if6_iter_state *state = seq->private; 2788 struct net *net = seq_file_net(seq); 2789 2790 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2791 ifa = inet6_addr_lst[state->bucket]; 2792 2793 while (ifa && !net_eq(dev_net(ifa->idev->dev), net)) 2794 ifa = ifa->lst_next; 2795 if (ifa) 2796 break; 2797 } 2798 return ifa; 2799 } 2800 2801 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2802 { 2803 struct if6_iter_state *state = seq->private; 2804 struct net *net = seq_file_net(seq); 2805 2806 ifa = ifa->lst_next; 2807 try_again: 2808 if (ifa) { 2809 if (!net_eq(dev_net(ifa->idev->dev), net)) { 2810 ifa = ifa->lst_next; 2811 goto try_again; 2812 } 2813 } 2814 2815 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2816 ifa = inet6_addr_lst[state->bucket]; 2817 goto try_again; 2818 } 2819 2820 return ifa; 2821 } 2822 2823 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2824 { 2825 struct inet6_ifaddr *ifa = if6_get_first(seq); 2826 2827 if (ifa) 2828 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2829 --pos; 2830 return pos ? NULL : ifa; 2831 } 2832 2833 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2834 __acquires(addrconf_hash_lock) 2835 { 2836 read_lock_bh(&addrconf_hash_lock); 2837 return if6_get_idx(seq, *pos); 2838 } 2839 2840 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2841 { 2842 struct inet6_ifaddr *ifa; 2843 2844 ifa = if6_get_next(seq, v); 2845 ++*pos; 2846 return ifa; 2847 } 2848 2849 static void if6_seq_stop(struct seq_file *seq, void *v) 2850 __releases(addrconf_hash_lock) 2851 { 2852 read_unlock_bh(&addrconf_hash_lock); 2853 } 2854 2855 static int if6_seq_show(struct seq_file *seq, void *v) 2856 { 2857 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2858 seq_printf(seq, 2859 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2860 NIP6(ifp->addr), 2861 ifp->idev->dev->ifindex, 2862 ifp->prefix_len, 2863 ifp->scope, 2864 ifp->flags, 2865 ifp->idev->dev->name); 2866 return 0; 2867 } 2868 2869 static const struct seq_operations if6_seq_ops = { 2870 .start = if6_seq_start, 2871 .next = if6_seq_next, 2872 .show = if6_seq_show, 2873 .stop = if6_seq_stop, 2874 }; 2875 2876 static int if6_seq_open(struct inode *inode, struct file *file) 2877 { 2878 return seq_open_net(inode, file, &if6_seq_ops, 2879 sizeof(struct if6_iter_state)); 2880 } 2881 2882 static const struct file_operations if6_fops = { 2883 .owner = THIS_MODULE, 2884 .open = if6_seq_open, 2885 .read = seq_read, 2886 .llseek = seq_lseek, 2887 .release = seq_release_net, 2888 }; 2889 2890 static int if6_proc_net_init(struct net *net) 2891 { 2892 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 2893 return -ENOMEM; 2894 return 0; 2895 } 2896 2897 static void if6_proc_net_exit(struct net *net) 2898 { 2899 proc_net_remove(net, "if_inet6"); 2900 } 2901 2902 static struct pernet_operations if6_proc_net_ops = { 2903 .init = if6_proc_net_init, 2904 .exit = if6_proc_net_exit, 2905 }; 2906 2907 int __init if6_proc_init(void) 2908 { 2909 return register_pernet_subsys(&if6_proc_net_ops); 2910 } 2911 2912 void if6_proc_exit(void) 2913 { 2914 unregister_pernet_subsys(&if6_proc_net_ops); 2915 } 2916 #endif /* CONFIG_PROC_FS */ 2917 2918 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 2919 /* Check if address is a home address configured on any interface. */ 2920 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 2921 { 2922 int ret = 0; 2923 struct inet6_ifaddr * ifp; 2924 u8 hash = ipv6_addr_hash(addr); 2925 read_lock_bh(&addrconf_hash_lock); 2926 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2927 if (!net_eq(dev_net(ifp->idev->dev), net)) 2928 continue; 2929 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 && 2930 (ifp->flags & IFA_F_HOMEADDRESS)) { 2931 ret = 1; 2932 break; 2933 } 2934 } 2935 read_unlock_bh(&addrconf_hash_lock); 2936 return ret; 2937 } 2938 #endif 2939 2940 /* 2941 * Periodic address status verification 2942 */ 2943 2944 static void addrconf_verify(unsigned long foo) 2945 { 2946 struct inet6_ifaddr *ifp; 2947 unsigned long now, next; 2948 int i; 2949 2950 spin_lock_bh(&addrconf_verify_lock); 2951 now = jiffies; 2952 next = now + ADDR_CHECK_FREQUENCY; 2953 2954 del_timer(&addr_chk_timer); 2955 2956 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2957 2958 restart: 2959 read_lock(&addrconf_hash_lock); 2960 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2961 unsigned long age; 2962 #ifdef CONFIG_IPV6_PRIVACY 2963 unsigned long regen_advance; 2964 #endif 2965 2966 if (ifp->flags & IFA_F_PERMANENT) 2967 continue; 2968 2969 spin_lock(&ifp->lock); 2970 age = (now - ifp->tstamp) / HZ; 2971 2972 #ifdef CONFIG_IPV6_PRIVACY 2973 regen_advance = ifp->idev->cnf.regen_max_retry * 2974 ifp->idev->cnf.dad_transmits * 2975 ifp->idev->nd_parms->retrans_time / HZ; 2976 #endif 2977 2978 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2979 age >= ifp->valid_lft) { 2980 spin_unlock(&ifp->lock); 2981 in6_ifa_hold(ifp); 2982 read_unlock(&addrconf_hash_lock); 2983 ipv6_del_addr(ifp); 2984 goto restart; 2985 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2986 spin_unlock(&ifp->lock); 2987 continue; 2988 } else if (age >= ifp->prefered_lft) { 2989 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2990 int deprecate = 0; 2991 2992 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2993 deprecate = 1; 2994 ifp->flags |= IFA_F_DEPRECATED; 2995 } 2996 2997 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2998 next = ifp->tstamp + ifp->valid_lft * HZ; 2999 3000 spin_unlock(&ifp->lock); 3001 3002 if (deprecate) { 3003 in6_ifa_hold(ifp); 3004 read_unlock(&addrconf_hash_lock); 3005 3006 ipv6_ifa_notify(0, ifp); 3007 in6_ifa_put(ifp); 3008 goto restart; 3009 } 3010 #ifdef CONFIG_IPV6_PRIVACY 3011 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3012 !(ifp->flags&IFA_F_TENTATIVE)) { 3013 if (age >= ifp->prefered_lft - regen_advance) { 3014 struct inet6_ifaddr *ifpub = ifp->ifpub; 3015 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3016 next = ifp->tstamp + ifp->prefered_lft * HZ; 3017 if (!ifp->regen_count && ifpub) { 3018 ifp->regen_count++; 3019 in6_ifa_hold(ifp); 3020 in6_ifa_hold(ifpub); 3021 spin_unlock(&ifp->lock); 3022 read_unlock(&addrconf_hash_lock); 3023 spin_lock(&ifpub->lock); 3024 ifpub->regen_count = 0; 3025 spin_unlock(&ifpub->lock); 3026 ipv6_create_tempaddr(ifpub, ifp); 3027 in6_ifa_put(ifpub); 3028 in6_ifa_put(ifp); 3029 goto restart; 3030 } 3031 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3032 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3033 spin_unlock(&ifp->lock); 3034 #endif 3035 } else { 3036 /* ifp->prefered_lft <= ifp->valid_lft */ 3037 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3038 next = ifp->tstamp + ifp->prefered_lft * HZ; 3039 spin_unlock(&ifp->lock); 3040 } 3041 } 3042 read_unlock(&addrconf_hash_lock); 3043 } 3044 3045 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3046 add_timer(&addr_chk_timer); 3047 spin_unlock_bh(&addrconf_verify_lock); 3048 } 3049 3050 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3051 { 3052 struct in6_addr *pfx = NULL; 3053 3054 if (addr) 3055 pfx = nla_data(addr); 3056 3057 if (local) { 3058 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3059 pfx = NULL; 3060 else 3061 pfx = nla_data(local); 3062 } 3063 3064 return pfx; 3065 } 3066 3067 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3068 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3069 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3070 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3071 }; 3072 3073 static int 3074 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3075 { 3076 struct net *net = sock_net(skb->sk); 3077 struct ifaddrmsg *ifm; 3078 struct nlattr *tb[IFA_MAX+1]; 3079 struct in6_addr *pfx; 3080 int err; 3081 3082 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3083 if (err < 0) 3084 return err; 3085 3086 ifm = nlmsg_data(nlh); 3087 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3088 if (pfx == NULL) 3089 return -EINVAL; 3090 3091 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3092 } 3093 3094 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3095 u32 prefered_lft, u32 valid_lft) 3096 { 3097 u32 flags = RTF_EXPIRES; 3098 3099 if (!valid_lft || (prefered_lft > valid_lft)) 3100 return -EINVAL; 3101 3102 if (valid_lft == INFINITY_LIFE_TIME) { 3103 ifa_flags |= IFA_F_PERMANENT; 3104 flags = 0; 3105 } else if (valid_lft >= 0x7FFFFFFF/HZ) 3106 valid_lft = 0x7FFFFFFF/HZ; 3107 3108 if (prefered_lft == 0) 3109 ifa_flags |= IFA_F_DEPRECATED; 3110 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 3111 (prefered_lft != INFINITY_LIFE_TIME)) 3112 prefered_lft = 0x7FFFFFFF/HZ; 3113 3114 spin_lock_bh(&ifp->lock); 3115 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3116 ifp->tstamp = jiffies; 3117 ifp->valid_lft = valid_lft; 3118 ifp->prefered_lft = prefered_lft; 3119 3120 spin_unlock_bh(&ifp->lock); 3121 if (!(ifp->flags&IFA_F_TENTATIVE)) 3122 ipv6_ifa_notify(0, ifp); 3123 3124 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3125 jiffies_to_clock_t(valid_lft * HZ), flags); 3126 addrconf_verify(0); 3127 3128 return 0; 3129 } 3130 3131 static int 3132 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3133 { 3134 struct net *net = sock_net(skb->sk); 3135 struct ifaddrmsg *ifm; 3136 struct nlattr *tb[IFA_MAX+1]; 3137 struct in6_addr *pfx; 3138 struct inet6_ifaddr *ifa; 3139 struct net_device *dev; 3140 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3141 u8 ifa_flags; 3142 int err; 3143 3144 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3145 if (err < 0) 3146 return err; 3147 3148 ifm = nlmsg_data(nlh); 3149 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3150 if (pfx == NULL) 3151 return -EINVAL; 3152 3153 if (tb[IFA_CACHEINFO]) { 3154 struct ifa_cacheinfo *ci; 3155 3156 ci = nla_data(tb[IFA_CACHEINFO]); 3157 valid_lft = ci->ifa_valid; 3158 preferred_lft = ci->ifa_prefered; 3159 } else { 3160 preferred_lft = INFINITY_LIFE_TIME; 3161 valid_lft = INFINITY_LIFE_TIME; 3162 } 3163 3164 dev = __dev_get_by_index(net, ifm->ifa_index); 3165 if (dev == NULL) 3166 return -ENODEV; 3167 3168 /* We ignore other flags so far. */ 3169 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3170 3171 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3172 if (ifa == NULL) { 3173 /* 3174 * It would be best to check for !NLM_F_CREATE here but 3175 * userspace alreay relies on not having to provide this. 3176 */ 3177 return inet6_addr_add(net, ifm->ifa_index, pfx, 3178 ifm->ifa_prefixlen, ifa_flags, 3179 preferred_lft, valid_lft); 3180 } 3181 3182 if (nlh->nlmsg_flags & NLM_F_EXCL || 3183 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3184 err = -EEXIST; 3185 else 3186 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3187 3188 in6_ifa_put(ifa); 3189 3190 return err; 3191 } 3192 3193 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3194 u8 scope, int ifindex) 3195 { 3196 struct ifaddrmsg *ifm; 3197 3198 ifm = nlmsg_data(nlh); 3199 ifm->ifa_family = AF_INET6; 3200 ifm->ifa_prefixlen = prefixlen; 3201 ifm->ifa_flags = flags; 3202 ifm->ifa_scope = scope; 3203 ifm->ifa_index = ifindex; 3204 } 3205 3206 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3207 unsigned long tstamp, u32 preferred, u32 valid) 3208 { 3209 struct ifa_cacheinfo ci; 3210 3211 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3212 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3213 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3214 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3215 ci.ifa_prefered = preferred; 3216 ci.ifa_valid = valid; 3217 3218 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3219 } 3220 3221 static inline int rt_scope(int ifa_scope) 3222 { 3223 if (ifa_scope & IFA_HOST) 3224 return RT_SCOPE_HOST; 3225 else if (ifa_scope & IFA_LINK) 3226 return RT_SCOPE_LINK; 3227 else if (ifa_scope & IFA_SITE) 3228 return RT_SCOPE_SITE; 3229 else 3230 return RT_SCOPE_UNIVERSE; 3231 } 3232 3233 static inline int inet6_ifaddr_msgsize(void) 3234 { 3235 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3236 + nla_total_size(16) /* IFA_ADDRESS */ 3237 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3238 } 3239 3240 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3241 u32 pid, u32 seq, int event, unsigned int flags) 3242 { 3243 struct nlmsghdr *nlh; 3244 u32 preferred, valid; 3245 3246 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3247 if (nlh == NULL) 3248 return -EMSGSIZE; 3249 3250 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3251 ifa->idev->dev->ifindex); 3252 3253 if (!(ifa->flags&IFA_F_PERMANENT)) { 3254 preferred = ifa->prefered_lft; 3255 valid = ifa->valid_lft; 3256 if (preferred != INFINITY_LIFE_TIME) { 3257 long tval = (jiffies - ifa->tstamp)/HZ; 3258 preferred -= tval; 3259 if (valid != INFINITY_LIFE_TIME) 3260 valid -= tval; 3261 } 3262 } else { 3263 preferred = INFINITY_LIFE_TIME; 3264 valid = INFINITY_LIFE_TIME; 3265 } 3266 3267 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3268 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3269 nlmsg_cancel(skb, nlh); 3270 return -EMSGSIZE; 3271 } 3272 3273 return nlmsg_end(skb, nlh); 3274 } 3275 3276 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3277 u32 pid, u32 seq, int event, u16 flags) 3278 { 3279 struct nlmsghdr *nlh; 3280 u8 scope = RT_SCOPE_UNIVERSE; 3281 int ifindex = ifmca->idev->dev->ifindex; 3282 3283 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3284 scope = RT_SCOPE_SITE; 3285 3286 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3287 if (nlh == NULL) 3288 return -EMSGSIZE; 3289 3290 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3291 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3292 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3293 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3294 nlmsg_cancel(skb, nlh); 3295 return -EMSGSIZE; 3296 } 3297 3298 return nlmsg_end(skb, nlh); 3299 } 3300 3301 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3302 u32 pid, u32 seq, int event, unsigned int flags) 3303 { 3304 struct nlmsghdr *nlh; 3305 u8 scope = RT_SCOPE_UNIVERSE; 3306 int ifindex = ifaca->aca_idev->dev->ifindex; 3307 3308 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3309 scope = RT_SCOPE_SITE; 3310 3311 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3312 if (nlh == NULL) 3313 return -EMSGSIZE; 3314 3315 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3316 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3317 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3318 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3319 nlmsg_cancel(skb, nlh); 3320 return -EMSGSIZE; 3321 } 3322 3323 return nlmsg_end(skb, nlh); 3324 } 3325 3326 enum addr_type_t 3327 { 3328 UNICAST_ADDR, 3329 MULTICAST_ADDR, 3330 ANYCAST_ADDR, 3331 }; 3332 3333 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3334 enum addr_type_t type) 3335 { 3336 int idx, ip_idx; 3337 int s_idx, s_ip_idx; 3338 int err = 1; 3339 struct net_device *dev; 3340 struct inet6_dev *idev = NULL; 3341 struct inet6_ifaddr *ifa; 3342 struct ifmcaddr6 *ifmca; 3343 struct ifacaddr6 *ifaca; 3344 struct net *net = sock_net(skb->sk); 3345 3346 s_idx = cb->args[0]; 3347 s_ip_idx = ip_idx = cb->args[1]; 3348 3349 idx = 0; 3350 for_each_netdev(net, dev) { 3351 if (idx < s_idx) 3352 goto cont; 3353 if (idx > s_idx) 3354 s_ip_idx = 0; 3355 ip_idx = 0; 3356 if ((idev = in6_dev_get(dev)) == NULL) 3357 goto cont; 3358 read_lock_bh(&idev->lock); 3359 switch (type) { 3360 case UNICAST_ADDR: 3361 /* unicast address incl. temp addr */ 3362 for (ifa = idev->addr_list; ifa; 3363 ifa = ifa->if_next, ip_idx++) { 3364 if (ip_idx < s_ip_idx) 3365 continue; 3366 err = inet6_fill_ifaddr(skb, ifa, 3367 NETLINK_CB(cb->skb).pid, 3368 cb->nlh->nlmsg_seq, 3369 RTM_NEWADDR, 3370 NLM_F_MULTI); 3371 } 3372 break; 3373 case MULTICAST_ADDR: 3374 /* multicast address */ 3375 for (ifmca = idev->mc_list; ifmca; 3376 ifmca = ifmca->next, ip_idx++) { 3377 if (ip_idx < s_ip_idx) 3378 continue; 3379 err = inet6_fill_ifmcaddr(skb, ifmca, 3380 NETLINK_CB(cb->skb).pid, 3381 cb->nlh->nlmsg_seq, 3382 RTM_GETMULTICAST, 3383 NLM_F_MULTI); 3384 } 3385 break; 3386 case ANYCAST_ADDR: 3387 /* anycast address */ 3388 for (ifaca = idev->ac_list; ifaca; 3389 ifaca = ifaca->aca_next, ip_idx++) { 3390 if (ip_idx < s_ip_idx) 3391 continue; 3392 err = inet6_fill_ifacaddr(skb, ifaca, 3393 NETLINK_CB(cb->skb).pid, 3394 cb->nlh->nlmsg_seq, 3395 RTM_GETANYCAST, 3396 NLM_F_MULTI); 3397 } 3398 break; 3399 default: 3400 break; 3401 } 3402 read_unlock_bh(&idev->lock); 3403 in6_dev_put(idev); 3404 3405 if (err <= 0) 3406 break; 3407 cont: 3408 idx++; 3409 } 3410 cb->args[0] = idx; 3411 cb->args[1] = ip_idx; 3412 return skb->len; 3413 } 3414 3415 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3416 { 3417 enum addr_type_t type = UNICAST_ADDR; 3418 3419 return inet6_dump_addr(skb, cb, type); 3420 } 3421 3422 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3423 { 3424 enum addr_type_t type = MULTICAST_ADDR; 3425 3426 return inet6_dump_addr(skb, cb, type); 3427 } 3428 3429 3430 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3431 { 3432 enum addr_type_t type = ANYCAST_ADDR; 3433 3434 return inet6_dump_addr(skb, cb, type); 3435 } 3436 3437 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3438 void *arg) 3439 { 3440 struct net *net = sock_net(in_skb->sk); 3441 struct ifaddrmsg *ifm; 3442 struct nlattr *tb[IFA_MAX+1]; 3443 struct in6_addr *addr = NULL; 3444 struct net_device *dev = NULL; 3445 struct inet6_ifaddr *ifa; 3446 struct sk_buff *skb; 3447 int err; 3448 3449 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3450 if (err < 0) 3451 goto errout; 3452 3453 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3454 if (addr == NULL) { 3455 err = -EINVAL; 3456 goto errout; 3457 } 3458 3459 ifm = nlmsg_data(nlh); 3460 if (ifm->ifa_index) 3461 dev = __dev_get_by_index(net, ifm->ifa_index); 3462 3463 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3464 err = -EADDRNOTAVAIL; 3465 goto errout; 3466 } 3467 3468 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3469 err = -ENOBUFS; 3470 goto errout_ifa; 3471 } 3472 3473 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3474 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3475 if (err < 0) { 3476 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3477 WARN_ON(err == -EMSGSIZE); 3478 kfree_skb(skb); 3479 goto errout_ifa; 3480 } 3481 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3482 errout_ifa: 3483 in6_ifa_put(ifa); 3484 errout: 3485 return err; 3486 } 3487 3488 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3489 { 3490 struct sk_buff *skb; 3491 struct net *net = dev_net(ifa->idev->dev); 3492 int err = -ENOBUFS; 3493 3494 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3495 if (skb == NULL) 3496 goto errout; 3497 3498 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3499 if (err < 0) { 3500 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3501 WARN_ON(err == -EMSGSIZE); 3502 kfree_skb(skb); 3503 goto errout; 3504 } 3505 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3506 errout: 3507 if (err < 0) 3508 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3509 } 3510 3511 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3512 __s32 *array, int bytes) 3513 { 3514 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3515 3516 memset(array, 0, bytes); 3517 array[DEVCONF_FORWARDING] = cnf->forwarding; 3518 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3519 array[DEVCONF_MTU6] = cnf->mtu6; 3520 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3521 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3522 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3523 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3524 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3525 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3526 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3527 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3528 #ifdef CONFIG_IPV6_PRIVACY 3529 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3530 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3531 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3532 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3533 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3534 #endif 3535 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3536 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3537 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3538 #ifdef CONFIG_IPV6_ROUTER_PREF 3539 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3540 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3541 #ifdef CONFIG_IPV6_ROUTE_INFO 3542 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3543 #endif 3544 #endif 3545 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3546 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3547 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3548 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3549 #endif 3550 } 3551 3552 static inline size_t inet6_if_nlmsg_size(void) 3553 { 3554 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3555 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3556 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3557 + nla_total_size(4) /* IFLA_MTU */ 3558 + nla_total_size(4) /* IFLA_LINK */ 3559 + nla_total_size( /* IFLA_PROTINFO */ 3560 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3561 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3562 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3563 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3564 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3565 ); 3566 } 3567 3568 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3569 int bytes) 3570 { 3571 int i; 3572 int pad = bytes - sizeof(u64) * items; 3573 BUG_ON(pad < 0); 3574 3575 /* Use put_unaligned() because stats may not be aligned for u64. */ 3576 put_unaligned(items, &stats[0]); 3577 for (i = 1; i < items; i++) 3578 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3579 3580 memset(&stats[items], 0, pad); 3581 } 3582 3583 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3584 int bytes) 3585 { 3586 switch(attrtype) { 3587 case IFLA_INET6_STATS: 3588 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3589 break; 3590 case IFLA_INET6_ICMP6STATS: 3591 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3592 break; 3593 } 3594 } 3595 3596 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3597 u32 pid, u32 seq, int event, unsigned int flags) 3598 { 3599 struct net_device *dev = idev->dev; 3600 struct nlattr *nla; 3601 struct ifinfomsg *hdr; 3602 struct nlmsghdr *nlh; 3603 void *protoinfo; 3604 struct ifla_cacheinfo ci; 3605 3606 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3607 if (nlh == NULL) 3608 return -EMSGSIZE; 3609 3610 hdr = nlmsg_data(nlh); 3611 hdr->ifi_family = AF_INET6; 3612 hdr->__ifi_pad = 0; 3613 hdr->ifi_type = dev->type; 3614 hdr->ifi_index = dev->ifindex; 3615 hdr->ifi_flags = dev_get_flags(dev); 3616 hdr->ifi_change = 0; 3617 3618 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3619 3620 if (dev->addr_len) 3621 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3622 3623 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3624 if (dev->ifindex != dev->iflink) 3625 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3626 3627 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3628 if (protoinfo == NULL) 3629 goto nla_put_failure; 3630 3631 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3632 3633 ci.max_reasm_len = IPV6_MAXPLEN; 3634 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3635 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3636 ci.reachable_time = idev->nd_parms->reachable_time; 3637 ci.retrans_time = idev->nd_parms->retrans_time; 3638 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3639 3640 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3641 if (nla == NULL) 3642 goto nla_put_failure; 3643 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3644 3645 /* XXX - MC not implemented */ 3646 3647 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3648 if (nla == NULL) 3649 goto nla_put_failure; 3650 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3651 3652 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3653 if (nla == NULL) 3654 goto nla_put_failure; 3655 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3656 3657 nla_nest_end(skb, protoinfo); 3658 return nlmsg_end(skb, nlh); 3659 3660 nla_put_failure: 3661 nlmsg_cancel(skb, nlh); 3662 return -EMSGSIZE; 3663 } 3664 3665 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3666 { 3667 struct net *net = sock_net(skb->sk); 3668 int idx, err; 3669 int s_idx = cb->args[0]; 3670 struct net_device *dev; 3671 struct inet6_dev *idev; 3672 3673 read_lock(&dev_base_lock); 3674 idx = 0; 3675 for_each_netdev(net, dev) { 3676 if (idx < s_idx) 3677 goto cont; 3678 if ((idev = in6_dev_get(dev)) == NULL) 3679 goto cont; 3680 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3681 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3682 in6_dev_put(idev); 3683 if (err <= 0) 3684 break; 3685 cont: 3686 idx++; 3687 } 3688 read_unlock(&dev_base_lock); 3689 cb->args[0] = idx; 3690 3691 return skb->len; 3692 } 3693 3694 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3695 { 3696 struct sk_buff *skb; 3697 struct net *net = dev_net(idev->dev); 3698 int err = -ENOBUFS; 3699 3700 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3701 if (skb == NULL) 3702 goto errout; 3703 3704 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3705 if (err < 0) { 3706 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3707 WARN_ON(err == -EMSGSIZE); 3708 kfree_skb(skb); 3709 goto errout; 3710 } 3711 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3712 errout: 3713 if (err < 0) 3714 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3715 } 3716 3717 static inline size_t inet6_prefix_nlmsg_size(void) 3718 { 3719 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3720 + nla_total_size(sizeof(struct in6_addr)) 3721 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3722 } 3723 3724 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3725 struct prefix_info *pinfo, u32 pid, u32 seq, 3726 int event, unsigned int flags) 3727 { 3728 struct prefixmsg *pmsg; 3729 struct nlmsghdr *nlh; 3730 struct prefix_cacheinfo ci; 3731 3732 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3733 if (nlh == NULL) 3734 return -EMSGSIZE; 3735 3736 pmsg = nlmsg_data(nlh); 3737 pmsg->prefix_family = AF_INET6; 3738 pmsg->prefix_pad1 = 0; 3739 pmsg->prefix_pad2 = 0; 3740 pmsg->prefix_ifindex = idev->dev->ifindex; 3741 pmsg->prefix_len = pinfo->prefix_len; 3742 pmsg->prefix_type = pinfo->type; 3743 pmsg->prefix_pad3 = 0; 3744 pmsg->prefix_flags = 0; 3745 if (pinfo->onlink) 3746 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3747 if (pinfo->autoconf) 3748 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3749 3750 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3751 3752 ci.preferred_time = ntohl(pinfo->prefered); 3753 ci.valid_time = ntohl(pinfo->valid); 3754 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3755 3756 return nlmsg_end(skb, nlh); 3757 3758 nla_put_failure: 3759 nlmsg_cancel(skb, nlh); 3760 return -EMSGSIZE; 3761 } 3762 3763 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3764 struct prefix_info *pinfo) 3765 { 3766 struct sk_buff *skb; 3767 struct net *net = dev_net(idev->dev); 3768 int err = -ENOBUFS; 3769 3770 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3771 if (skb == NULL) 3772 goto errout; 3773 3774 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3775 if (err < 0) { 3776 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3777 WARN_ON(err == -EMSGSIZE); 3778 kfree_skb(skb); 3779 goto errout; 3780 } 3781 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3782 errout: 3783 if (err < 0) 3784 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 3785 } 3786 3787 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3788 { 3789 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3790 3791 switch (event) { 3792 case RTM_NEWADDR: 3793 /* 3794 * If the address was optimistic 3795 * we inserted the route at the start of 3796 * our DAD process, so we don't need 3797 * to do it again 3798 */ 3799 if (!(ifp->rt->rt6i_node)) 3800 ip6_ins_rt(ifp->rt); 3801 if (ifp->idev->cnf.forwarding) 3802 addrconf_join_anycast(ifp); 3803 break; 3804 case RTM_DELADDR: 3805 if (ifp->idev->cnf.forwarding) 3806 addrconf_leave_anycast(ifp); 3807 addrconf_leave_solict(ifp->idev, &ifp->addr); 3808 dst_hold(&ifp->rt->u.dst); 3809 if (ip6_del_rt(ifp->rt)) 3810 dst_free(&ifp->rt->u.dst); 3811 break; 3812 } 3813 } 3814 3815 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3816 { 3817 rcu_read_lock_bh(); 3818 if (likely(ifp->idev->dead == 0)) 3819 __ipv6_ifa_notify(event, ifp); 3820 rcu_read_unlock_bh(); 3821 } 3822 3823 #ifdef CONFIG_SYSCTL 3824 3825 static 3826 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3827 void __user *buffer, size_t *lenp, loff_t *ppos) 3828 { 3829 int *valp = ctl->data; 3830 int val = *valp; 3831 int ret; 3832 3833 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3834 3835 if (write) 3836 addrconf_fixup_forwarding(ctl, valp, val); 3837 return ret; 3838 } 3839 3840 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3841 int __user *name, int nlen, 3842 void __user *oldval, 3843 size_t __user *oldlenp, 3844 void __user *newval, size_t newlen) 3845 { 3846 int *valp = table->data; 3847 int val = *valp; 3848 int new; 3849 3850 if (!newval || !newlen) 3851 return 0; 3852 if (newlen != sizeof(int)) 3853 return -EINVAL; 3854 if (get_user(new, (int __user *)newval)) 3855 return -EFAULT; 3856 if (new == *valp) 3857 return 0; 3858 if (oldval && oldlenp) { 3859 size_t len; 3860 if (get_user(len, oldlenp)) 3861 return -EFAULT; 3862 if (len) { 3863 if (len > table->maxlen) 3864 len = table->maxlen; 3865 if (copy_to_user(oldval, valp, len)) 3866 return -EFAULT; 3867 if (put_user(len, oldlenp)) 3868 return -EFAULT; 3869 } 3870 } 3871 3872 *valp = new; 3873 addrconf_fixup_forwarding(table, valp, val); 3874 return 1; 3875 } 3876 3877 static struct addrconf_sysctl_table 3878 { 3879 struct ctl_table_header *sysctl_header; 3880 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3881 char *dev_name; 3882 } addrconf_sysctl __read_mostly = { 3883 .sysctl_header = NULL, 3884 .addrconf_vars = { 3885 { 3886 .ctl_name = NET_IPV6_FORWARDING, 3887 .procname = "forwarding", 3888 .data = &ipv6_devconf.forwarding, 3889 .maxlen = sizeof(int), 3890 .mode = 0644, 3891 .proc_handler = &addrconf_sysctl_forward, 3892 .strategy = &addrconf_sysctl_forward_strategy, 3893 }, 3894 { 3895 .ctl_name = NET_IPV6_HOP_LIMIT, 3896 .procname = "hop_limit", 3897 .data = &ipv6_devconf.hop_limit, 3898 .maxlen = sizeof(int), 3899 .mode = 0644, 3900 .proc_handler = proc_dointvec, 3901 }, 3902 { 3903 .ctl_name = NET_IPV6_MTU, 3904 .procname = "mtu", 3905 .data = &ipv6_devconf.mtu6, 3906 .maxlen = sizeof(int), 3907 .mode = 0644, 3908 .proc_handler = &proc_dointvec, 3909 }, 3910 { 3911 .ctl_name = NET_IPV6_ACCEPT_RA, 3912 .procname = "accept_ra", 3913 .data = &ipv6_devconf.accept_ra, 3914 .maxlen = sizeof(int), 3915 .mode = 0644, 3916 .proc_handler = &proc_dointvec, 3917 }, 3918 { 3919 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3920 .procname = "accept_redirects", 3921 .data = &ipv6_devconf.accept_redirects, 3922 .maxlen = sizeof(int), 3923 .mode = 0644, 3924 .proc_handler = &proc_dointvec, 3925 }, 3926 { 3927 .ctl_name = NET_IPV6_AUTOCONF, 3928 .procname = "autoconf", 3929 .data = &ipv6_devconf.autoconf, 3930 .maxlen = sizeof(int), 3931 .mode = 0644, 3932 .proc_handler = &proc_dointvec, 3933 }, 3934 { 3935 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3936 .procname = "dad_transmits", 3937 .data = &ipv6_devconf.dad_transmits, 3938 .maxlen = sizeof(int), 3939 .mode = 0644, 3940 .proc_handler = &proc_dointvec, 3941 }, 3942 { 3943 .ctl_name = NET_IPV6_RTR_SOLICITS, 3944 .procname = "router_solicitations", 3945 .data = &ipv6_devconf.rtr_solicits, 3946 .maxlen = sizeof(int), 3947 .mode = 0644, 3948 .proc_handler = &proc_dointvec, 3949 }, 3950 { 3951 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3952 .procname = "router_solicitation_interval", 3953 .data = &ipv6_devconf.rtr_solicit_interval, 3954 .maxlen = sizeof(int), 3955 .mode = 0644, 3956 .proc_handler = &proc_dointvec_jiffies, 3957 .strategy = &sysctl_jiffies, 3958 }, 3959 { 3960 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3961 .procname = "router_solicitation_delay", 3962 .data = &ipv6_devconf.rtr_solicit_delay, 3963 .maxlen = sizeof(int), 3964 .mode = 0644, 3965 .proc_handler = &proc_dointvec_jiffies, 3966 .strategy = &sysctl_jiffies, 3967 }, 3968 { 3969 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3970 .procname = "force_mld_version", 3971 .data = &ipv6_devconf.force_mld_version, 3972 .maxlen = sizeof(int), 3973 .mode = 0644, 3974 .proc_handler = &proc_dointvec, 3975 }, 3976 #ifdef CONFIG_IPV6_PRIVACY 3977 { 3978 .ctl_name = NET_IPV6_USE_TEMPADDR, 3979 .procname = "use_tempaddr", 3980 .data = &ipv6_devconf.use_tempaddr, 3981 .maxlen = sizeof(int), 3982 .mode = 0644, 3983 .proc_handler = &proc_dointvec, 3984 }, 3985 { 3986 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3987 .procname = "temp_valid_lft", 3988 .data = &ipv6_devconf.temp_valid_lft, 3989 .maxlen = sizeof(int), 3990 .mode = 0644, 3991 .proc_handler = &proc_dointvec, 3992 }, 3993 { 3994 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3995 .procname = "temp_prefered_lft", 3996 .data = &ipv6_devconf.temp_prefered_lft, 3997 .maxlen = sizeof(int), 3998 .mode = 0644, 3999 .proc_handler = &proc_dointvec, 4000 }, 4001 { 4002 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4003 .procname = "regen_max_retry", 4004 .data = &ipv6_devconf.regen_max_retry, 4005 .maxlen = sizeof(int), 4006 .mode = 0644, 4007 .proc_handler = &proc_dointvec, 4008 }, 4009 { 4010 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4011 .procname = "max_desync_factor", 4012 .data = &ipv6_devconf.max_desync_factor, 4013 .maxlen = sizeof(int), 4014 .mode = 0644, 4015 .proc_handler = &proc_dointvec, 4016 }, 4017 #endif 4018 { 4019 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4020 .procname = "max_addresses", 4021 .data = &ipv6_devconf.max_addresses, 4022 .maxlen = sizeof(int), 4023 .mode = 0644, 4024 .proc_handler = &proc_dointvec, 4025 }, 4026 { 4027 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4028 .procname = "accept_ra_defrtr", 4029 .data = &ipv6_devconf.accept_ra_defrtr, 4030 .maxlen = sizeof(int), 4031 .mode = 0644, 4032 .proc_handler = &proc_dointvec, 4033 }, 4034 { 4035 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4036 .procname = "accept_ra_pinfo", 4037 .data = &ipv6_devconf.accept_ra_pinfo, 4038 .maxlen = sizeof(int), 4039 .mode = 0644, 4040 .proc_handler = &proc_dointvec, 4041 }, 4042 #ifdef CONFIG_IPV6_ROUTER_PREF 4043 { 4044 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4045 .procname = "accept_ra_rtr_pref", 4046 .data = &ipv6_devconf.accept_ra_rtr_pref, 4047 .maxlen = sizeof(int), 4048 .mode = 0644, 4049 .proc_handler = &proc_dointvec, 4050 }, 4051 { 4052 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4053 .procname = "router_probe_interval", 4054 .data = &ipv6_devconf.rtr_probe_interval, 4055 .maxlen = sizeof(int), 4056 .mode = 0644, 4057 .proc_handler = &proc_dointvec_jiffies, 4058 .strategy = &sysctl_jiffies, 4059 }, 4060 #ifdef CONFIG_IPV6_ROUTE_INFO 4061 { 4062 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4063 .procname = "accept_ra_rt_info_max_plen", 4064 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4065 .maxlen = sizeof(int), 4066 .mode = 0644, 4067 .proc_handler = &proc_dointvec, 4068 }, 4069 #endif 4070 #endif 4071 { 4072 .ctl_name = NET_IPV6_PROXY_NDP, 4073 .procname = "proxy_ndp", 4074 .data = &ipv6_devconf.proxy_ndp, 4075 .maxlen = sizeof(int), 4076 .mode = 0644, 4077 .proc_handler = &proc_dointvec, 4078 }, 4079 { 4080 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4081 .procname = "accept_source_route", 4082 .data = &ipv6_devconf.accept_source_route, 4083 .maxlen = sizeof(int), 4084 .mode = 0644, 4085 .proc_handler = &proc_dointvec, 4086 }, 4087 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4088 { 4089 .ctl_name = CTL_UNNUMBERED, 4090 .procname = "optimistic_dad", 4091 .data = &ipv6_devconf.optimistic_dad, 4092 .maxlen = sizeof(int), 4093 .mode = 0644, 4094 .proc_handler = &proc_dointvec, 4095 4096 }, 4097 #endif 4098 { 4099 .ctl_name = 0, /* sentinel */ 4100 } 4101 }, 4102 }; 4103 4104 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4105 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4106 { 4107 int i; 4108 struct addrconf_sysctl_table *t; 4109 4110 #define ADDRCONF_CTL_PATH_DEV 3 4111 4112 struct ctl_path addrconf_ctl_path[] = { 4113 { .procname = "net", .ctl_name = CTL_NET, }, 4114 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4115 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4116 { /* to be set */ }, 4117 { }, 4118 }; 4119 4120 4121 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4122 if (t == NULL) 4123 goto out; 4124 4125 for (i=0; t->addrconf_vars[i].data; i++) { 4126 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4127 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4128 t->addrconf_vars[i].extra2 = net; 4129 } 4130 4131 /* 4132 * Make a copy of dev_name, because '.procname' is regarded as const 4133 * by sysctl and we wouldn't want anyone to change it under our feet 4134 * (see SIOCSIFNAME). 4135 */ 4136 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4137 if (!t->dev_name) 4138 goto free; 4139 4140 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4141 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4142 4143 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4144 t->addrconf_vars); 4145 if (t->sysctl_header == NULL) 4146 goto free_procname; 4147 4148 p->sysctl = t; 4149 return 0; 4150 4151 free_procname: 4152 kfree(t->dev_name); 4153 free: 4154 kfree(t); 4155 out: 4156 return -ENOBUFS; 4157 } 4158 4159 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4160 { 4161 struct addrconf_sysctl_table *t; 4162 4163 if (p->sysctl == NULL) 4164 return; 4165 4166 t = p->sysctl; 4167 p->sysctl = NULL; 4168 unregister_sysctl_table(t->sysctl_header); 4169 kfree(t->dev_name); 4170 kfree(t); 4171 } 4172 4173 static void addrconf_sysctl_register(struct inet6_dev *idev) 4174 { 4175 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4176 NET_IPV6_NEIGH, "ipv6", 4177 &ndisc_ifinfo_sysctl_change, 4178 NULL); 4179 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4180 idev->dev->ifindex, idev, &idev->cnf); 4181 } 4182 4183 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4184 { 4185 __addrconf_sysctl_unregister(&idev->cnf); 4186 neigh_sysctl_unregister(idev->nd_parms); 4187 } 4188 4189 4190 #endif 4191 4192 static int addrconf_init_net(struct net *net) 4193 { 4194 int err; 4195 struct ipv6_devconf *all, *dflt; 4196 4197 err = -ENOMEM; 4198 all = &ipv6_devconf; 4199 dflt = &ipv6_devconf_dflt; 4200 4201 if (net != &init_net) { 4202 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4203 if (all == NULL) 4204 goto err_alloc_all; 4205 4206 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4207 if (dflt == NULL) 4208 goto err_alloc_dflt; 4209 } 4210 4211 net->ipv6.devconf_all = all; 4212 net->ipv6.devconf_dflt = dflt; 4213 4214 #ifdef CONFIG_SYSCTL 4215 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4216 NULL, all); 4217 if (err < 0) 4218 goto err_reg_all; 4219 4220 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4221 NULL, dflt); 4222 if (err < 0) 4223 goto err_reg_dflt; 4224 #endif 4225 return 0; 4226 4227 #ifdef CONFIG_SYSCTL 4228 err_reg_dflt: 4229 __addrconf_sysctl_unregister(all); 4230 err_reg_all: 4231 kfree(dflt); 4232 #endif 4233 err_alloc_dflt: 4234 kfree(all); 4235 err_alloc_all: 4236 return err; 4237 } 4238 4239 static void addrconf_exit_net(struct net *net) 4240 { 4241 #ifdef CONFIG_SYSCTL 4242 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4243 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4244 #endif 4245 if (net != &init_net) { 4246 kfree(net->ipv6.devconf_dflt); 4247 kfree(net->ipv6.devconf_all); 4248 } 4249 } 4250 4251 static struct pernet_operations addrconf_ops = { 4252 .init = addrconf_init_net, 4253 .exit = addrconf_exit_net, 4254 }; 4255 4256 /* 4257 * Device notifier 4258 */ 4259 4260 int register_inet6addr_notifier(struct notifier_block *nb) 4261 { 4262 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4263 } 4264 4265 EXPORT_SYMBOL(register_inet6addr_notifier); 4266 4267 int unregister_inet6addr_notifier(struct notifier_block *nb) 4268 { 4269 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4270 } 4271 4272 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4273 4274 4275 static int addrconf_net_init(struct net *net) 4276 { 4277 return 0; 4278 } 4279 4280 static void addrconf_net_exit(struct net *net) 4281 { 4282 struct net_device *dev; 4283 4284 rtnl_lock(); 4285 /* clean dev list */ 4286 for_each_netdev(net, dev) { 4287 if (__in6_dev_get(dev) == NULL) 4288 continue; 4289 addrconf_ifdown(dev, 1); 4290 } 4291 addrconf_ifdown(net->loopback_dev, 2); 4292 rtnl_unlock(); 4293 } 4294 4295 static struct pernet_operations addrconf_net_ops = { 4296 .init = addrconf_net_init, 4297 .exit = addrconf_net_exit, 4298 }; 4299 4300 /* 4301 * Init / cleanup code 4302 */ 4303 4304 int __init addrconf_init(void) 4305 { 4306 int err; 4307 4308 if ((err = ipv6_addr_label_init()) < 0) { 4309 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4310 err); 4311 return err; 4312 } 4313 4314 register_pernet_subsys(&addrconf_ops); 4315 4316 /* The addrconf netdev notifier requires that loopback_dev 4317 * has it's ipv6 private information allocated and setup 4318 * before it can bring up and give link-local addresses 4319 * to other devices which are up. 4320 * 4321 * Unfortunately, loopback_dev is not necessarily the first 4322 * entry in the global dev_base list of net devices. In fact, 4323 * it is likely to be the very last entry on that list. 4324 * So this causes the notifier registry below to try and 4325 * give link-local addresses to all devices besides loopback_dev 4326 * first, then loopback_dev, which cases all the non-loopback_dev 4327 * devices to fail to get a link-local address. 4328 * 4329 * So, as a temporary fix, allocate the ipv6 structure for 4330 * loopback_dev first by hand. 4331 * Longer term, all of the dependencies ipv6 has upon the loopback 4332 * device and it being up should be removed. 4333 */ 4334 rtnl_lock(); 4335 if (!ipv6_add_dev(init_net.loopback_dev)) 4336 err = -ENOMEM; 4337 rtnl_unlock(); 4338 if (err) 4339 goto errlo; 4340 4341 err = register_pernet_device(&addrconf_net_ops); 4342 if (err) 4343 return err; 4344 4345 register_netdevice_notifier(&ipv6_dev_notf); 4346 4347 addrconf_verify(0); 4348 4349 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4350 if (err < 0) 4351 goto errout; 4352 4353 /* Only the first call to __rtnl_register can fail */ 4354 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4355 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4356 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4357 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4358 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4359 4360 ipv6_addr_label_rtnl_register(); 4361 4362 return 0; 4363 errout: 4364 unregister_netdevice_notifier(&ipv6_dev_notf); 4365 errlo: 4366 unregister_pernet_subsys(&addrconf_ops); 4367 4368 return err; 4369 } 4370 4371 void addrconf_cleanup(void) 4372 { 4373 struct inet6_ifaddr *ifa; 4374 int i; 4375 4376 unregister_netdevice_notifier(&ipv6_dev_notf); 4377 unregister_pernet_device(&addrconf_net_ops); 4378 4379 unregister_pernet_subsys(&addrconf_ops); 4380 4381 rtnl_lock(); 4382 4383 /* 4384 * Check hash table. 4385 */ 4386 write_lock_bh(&addrconf_hash_lock); 4387 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4388 for (ifa=inet6_addr_lst[i]; ifa; ) { 4389 struct inet6_ifaddr *bifa; 4390 4391 bifa = ifa; 4392 ifa = ifa->lst_next; 4393 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4394 /* Do not free it; something is wrong. 4395 Now we can investigate it with debugger. 4396 */ 4397 } 4398 } 4399 write_unlock_bh(&addrconf_hash_lock); 4400 4401 del_timer(&addr_chk_timer); 4402 rtnl_unlock(); 4403 4404 unregister_pernet_subsys(&addrconf_net_ops); 4405 } 4406