1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 /* 18 * Changes: 19 * 20 * Janos Farkas : delete timer on ifdown 21 * <chexum@bankinf.banki.hu> 22 * Andi Kleen : kill double kfree on module 23 * unload. 24 * Maciej W. Rozycki : FDDI support 25 * sekiya@USAGI : Don't send too many RS 26 * packets. 27 * yoshfuji@USAGI : Fixed interval between DAD 28 * packets. 29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 30 * address validation timer. 31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 32 * support. 33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 34 * address on a same interface. 35 * YOSHIFUJI Hideaki @USAGI : ARCnet support 36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 37 * seq_file. 38 * YOSHIFUJI Hideaki @USAGI : improved source address 39 * selection; consider scope, 40 * status etc. 41 */ 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/socket.h> 46 #include <linux/sockios.h> 47 #include <linux/net.h> 48 #include <linux/in6.h> 49 #include <linux/netdevice.h> 50 #include <linux/if_addr.h> 51 #include <linux/if_arp.h> 52 #include <linux/if_arcnet.h> 53 #include <linux/if_infiniband.h> 54 #include <linux/route.h> 55 #include <linux/inetdevice.h> 56 #include <linux/init.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <asm/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 91 /* Set to 3 to get tracing... */ 92 #define ACONF_DEBUG 2 93 94 #if ACONF_DEBUG >= 3 95 #define ADBG(x) printk x 96 #else 97 #define ADBG(x) 98 #endif 99 100 #define INFINITY_LIFE_TIME 0xFFFFFFFF 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 102 103 #ifdef CONFIG_SYSCTL 104 static void addrconf_sysctl_register(struct inet6_dev *idev); 105 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 106 #else 107 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 108 { 109 } 110 111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 112 { 113 } 114 #endif 115 116 #ifdef CONFIG_IPV6_PRIVACY 117 static int __ipv6_regen_rndid(struct inet6_dev *idev); 118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 119 static void ipv6_regen_rndid(unsigned long data); 120 121 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 122 #endif 123 124 static int ipv6_count_addresses(struct inet6_dev *idev); 125 126 /* 127 * Configured unicast address hash table 128 */ 129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 130 static DEFINE_RWLOCK(addrconf_hash_lock); 131 132 static void addrconf_verify(unsigned long); 133 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 135 static DEFINE_SPINLOCK(addrconf_verify_lock); 136 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 139 140 static int addrconf_ifdown(struct net_device *dev, int how); 141 142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 143 static void addrconf_dad_timer(unsigned long data); 144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 145 static void addrconf_dad_run(struct inet6_dev *idev); 146 static void addrconf_rs_timer(unsigned long data); 147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 149 150 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 151 struct prefix_info *pinfo); 152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 153 struct net_device *dev); 154 155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 156 157 struct ipv6_devconf ipv6_devconf __read_mostly = { 158 .forwarding = 0, 159 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 160 .mtu6 = IPV6_MIN_MTU, 161 .accept_ra = 1, 162 .accept_redirects = 1, 163 .autoconf = 1, 164 .force_mld_version = 0, 165 .dad_transmits = 1, 166 .rtr_solicits = MAX_RTR_SOLICITATIONS, 167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 169 #ifdef CONFIG_IPV6_PRIVACY 170 .use_tempaddr = 0, 171 .temp_valid_lft = TEMP_VALID_LIFETIME, 172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 173 .regen_max_retry = REGEN_MAX_RETRY, 174 .max_desync_factor = MAX_DESYNC_FACTOR, 175 #endif 176 .max_addresses = IPV6_MAX_ADDRESSES, 177 .accept_ra_defrtr = 1, 178 .accept_ra_pinfo = 1, 179 #ifdef CONFIG_IPV6_ROUTER_PREF 180 .accept_ra_rtr_pref = 1, 181 .rtr_probe_interval = 60 * HZ, 182 #ifdef CONFIG_IPV6_ROUTE_INFO 183 .accept_ra_rt_info_max_plen = 0, 184 #endif 185 #endif 186 .proxy_ndp = 0, 187 .accept_source_route = 0, /* we do not accept RH0 by default. */ 188 }; 189 190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .dad_transmits = 1, 198 .rtr_solicits = MAX_RTR_SOLICITATIONS, 199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 201 #ifdef CONFIG_IPV6_PRIVACY 202 .use_tempaddr = 0, 203 .temp_valid_lft = TEMP_VALID_LIFETIME, 204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 205 .regen_max_retry = REGEN_MAX_RETRY, 206 .max_desync_factor = MAX_DESYNC_FACTOR, 207 #endif 208 .max_addresses = IPV6_MAX_ADDRESSES, 209 .accept_ra_defrtr = 1, 210 .accept_ra_pinfo = 1, 211 #ifdef CONFIG_IPV6_ROUTER_PREF 212 .accept_ra_rtr_pref = 1, 213 .rtr_probe_interval = 60 * HZ, 214 #ifdef CONFIG_IPV6_ROUTE_INFO 215 .accept_ra_rt_info_max_plen = 0, 216 #endif 217 #endif 218 .proxy_ndp = 0, 219 .accept_source_route = 0, /* we do not accept RH0 by default. */ 220 }; 221 222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 225 226 /* Check if a valid qdisc is available */ 227 static inline int addrconf_qdisc_ok(struct net_device *dev) 228 { 229 return (dev->qdisc != &noop_qdisc); 230 } 231 232 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 233 { 234 if (del_timer(&ifp->timer)) 235 __in6_ifa_put(ifp); 236 } 237 238 enum addrconf_timer_t 239 { 240 AC_NONE, 241 AC_DAD, 242 AC_RS, 243 }; 244 245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 246 enum addrconf_timer_t what, 247 unsigned long when) 248 { 249 if (!del_timer(&ifp->timer)) 250 in6_ifa_hold(ifp); 251 252 switch (what) { 253 case AC_DAD: 254 ifp->timer.function = addrconf_dad_timer; 255 break; 256 case AC_RS: 257 ifp->timer.function = addrconf_rs_timer; 258 break; 259 default:; 260 } 261 ifp->timer.expires = jiffies + when; 262 add_timer(&ifp->timer); 263 } 264 265 static int snmp6_alloc_dev(struct inet6_dev *idev) 266 { 267 if (snmp_mib_init((void **)idev->stats.ipv6, 268 sizeof(struct ipstats_mib)) < 0) 269 goto err_ip; 270 if (snmp_mib_init((void **)idev->stats.icmpv6, 271 sizeof(struct icmpv6_mib)) < 0) 272 goto err_icmp; 273 if (snmp_mib_init((void **)idev->stats.icmpv6msg, 274 sizeof(struct icmpv6msg_mib)) < 0) 275 goto err_icmpmsg; 276 277 return 0; 278 279 err_icmpmsg: 280 snmp_mib_free((void **)idev->stats.icmpv6); 281 err_icmp: 282 snmp_mib_free((void **)idev->stats.ipv6); 283 err_ip: 284 return -ENOMEM; 285 } 286 287 static void snmp6_free_dev(struct inet6_dev *idev) 288 { 289 snmp_mib_free((void **)idev->stats.icmpv6msg); 290 snmp_mib_free((void **)idev->stats.icmpv6); 291 snmp_mib_free((void **)idev->stats.ipv6); 292 } 293 294 /* Nobody refers to this device, we may destroy it. */ 295 296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 297 { 298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 299 kfree(idev); 300 } 301 302 void in6_dev_finish_destroy(struct inet6_dev *idev) 303 { 304 struct net_device *dev = idev->dev; 305 BUG_TRAP(idev->addr_list==NULL); 306 BUG_TRAP(idev->mc_list==NULL); 307 #ifdef NET_REFCNT_DEBUG 308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 309 #endif 310 dev_put(dev); 311 if (!idev->dead) { 312 printk("Freeing alive inet6 device %p\n", idev); 313 return; 314 } 315 snmp6_free_dev(idev); 316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 317 } 318 319 EXPORT_SYMBOL(in6_dev_finish_destroy); 320 321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 322 { 323 struct inet6_dev *ndev; 324 struct in6_addr maddr; 325 326 ASSERT_RTNL(); 327 328 if (dev->mtu < IPV6_MIN_MTU) 329 return NULL; 330 331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 332 333 if (ndev == NULL) 334 return NULL; 335 336 rwlock_init(&ndev->lock); 337 ndev->dev = dev; 338 memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf)); 339 ndev->cnf.mtu6 = dev->mtu; 340 ndev->cnf.sysctl = NULL; 341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 342 if (ndev->nd_parms == NULL) { 343 kfree(ndev); 344 return NULL; 345 } 346 /* We refer to the device */ 347 dev_hold(dev); 348 349 if (snmp6_alloc_dev(ndev) < 0) { 350 ADBG((KERN_WARNING 351 "%s(): cannot allocate memory for statistics; dev=%s.\n", 352 __FUNCTION__, dev->name)); 353 neigh_parms_release(&nd_tbl, ndev->nd_parms); 354 ndev->dead = 1; 355 in6_dev_finish_destroy(ndev); 356 return NULL; 357 } 358 359 if (snmp6_register_dev(ndev) < 0) { 360 ADBG((KERN_WARNING 361 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 362 __FUNCTION__, dev->name)); 363 neigh_parms_release(&nd_tbl, ndev->nd_parms); 364 ndev->dead = 1; 365 in6_dev_finish_destroy(ndev); 366 return NULL; 367 } 368 369 /* One reference from device. We must do this before 370 * we invoke __ipv6_regen_rndid(). 371 */ 372 in6_dev_hold(ndev); 373 374 #ifdef CONFIG_IPV6_PRIVACY 375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 376 if ((dev->flags&IFF_LOOPBACK) || 377 dev->type == ARPHRD_TUNNEL || 378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 379 dev->type == ARPHRD_SIT || 380 #endif 381 dev->type == ARPHRD_NONE) { 382 printk(KERN_INFO 383 "%s: Disabled Privacy Extensions\n", 384 dev->name); 385 ndev->cnf.use_tempaddr = -1; 386 387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 388 printk(KERN_INFO 389 "%s: Disabled Multicast RS\n", 390 dev->name); 391 ndev->cnf.rtr_solicits = 0; 392 } 393 } else { 394 in6_dev_hold(ndev); 395 ipv6_regen_rndid((unsigned long) ndev); 396 } 397 #endif 398 399 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 400 ndev->if_flags |= IF_READY; 401 402 ipv6_mc_init_dev(ndev); 403 ndev->tstamp = jiffies; 404 addrconf_sysctl_register(ndev); 405 /* protected by rtnl_lock */ 406 rcu_assign_pointer(dev->ip6_ptr, ndev); 407 408 /* Join all-node multicast group */ 409 ipv6_addr_all_nodes(&maddr); 410 ipv6_dev_mc_inc(dev, &maddr); 411 412 return ndev; 413 } 414 415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 416 { 417 struct inet6_dev *idev; 418 419 ASSERT_RTNL(); 420 421 if ((idev = __in6_dev_get(dev)) == NULL) { 422 if ((idev = ipv6_add_dev(dev)) == NULL) 423 return NULL; 424 } 425 426 if (dev->flags&IFF_UP) 427 ipv6_mc_up(idev); 428 return idev; 429 } 430 431 #ifdef CONFIG_SYSCTL 432 static void dev_forward_change(struct inet6_dev *idev) 433 { 434 struct net_device *dev; 435 struct inet6_ifaddr *ifa; 436 struct in6_addr addr; 437 438 if (!idev) 439 return; 440 dev = idev->dev; 441 if (dev && (dev->flags & IFF_MULTICAST)) { 442 ipv6_addr_all_routers(&addr); 443 444 if (idev->cnf.forwarding) 445 ipv6_dev_mc_inc(dev, &addr); 446 else 447 ipv6_dev_mc_dec(dev, &addr); 448 } 449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 450 if (ifa->flags&IFA_F_TENTATIVE) 451 continue; 452 if (idev->cnf.forwarding) 453 addrconf_join_anycast(ifa); 454 else 455 addrconf_leave_anycast(ifa); 456 } 457 } 458 459 460 static void addrconf_forward_change(struct net *net, __s32 newf) 461 { 462 struct net_device *dev; 463 struct inet6_dev *idev; 464 465 read_lock(&dev_base_lock); 466 for_each_netdev(net, dev) { 467 rcu_read_lock(); 468 idev = __in6_dev_get(dev); 469 if (idev) { 470 int changed = (!idev->cnf.forwarding) ^ (!newf); 471 idev->cnf.forwarding = newf; 472 if (changed) 473 dev_forward_change(idev); 474 } 475 rcu_read_unlock(); 476 } 477 read_unlock(&dev_base_lock); 478 } 479 480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 481 { 482 struct net *net; 483 484 net = (struct net *)table->extra2; 485 if (p == &net->ipv6.devconf_dflt->forwarding) 486 return; 487 488 if (p == &net->ipv6.devconf_all->forwarding) { 489 __s32 newf = net->ipv6.devconf_all->forwarding; 490 net->ipv6.devconf_dflt->forwarding = newf; 491 addrconf_forward_change(net, newf); 492 } else if ((!*p) ^ (!old)) 493 dev_forward_change((struct inet6_dev *)table->extra1); 494 495 if (*p) 496 rt6_purge_dflt_routers(); 497 } 498 #endif 499 500 /* Nobody refers to this ifaddr, destroy it */ 501 502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 503 { 504 BUG_TRAP(ifp->if_next==NULL); 505 BUG_TRAP(ifp->lst_next==NULL); 506 #ifdef NET_REFCNT_DEBUG 507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 508 #endif 509 510 in6_dev_put(ifp->idev); 511 512 if (del_timer(&ifp->timer)) 513 printk("Timer is still running, when freeing ifa=%p\n", ifp); 514 515 if (!ifp->dead) { 516 printk("Freeing alive inet6 address %p\n", ifp); 517 return; 518 } 519 dst_release(&ifp->rt->u.dst); 520 521 kfree(ifp); 522 } 523 524 static void 525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 526 { 527 struct inet6_ifaddr *ifa, **ifap; 528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 529 530 /* 531 * Each device address list is sorted in order of scope - 532 * global before linklocal. 533 */ 534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 535 ifap = &ifa->if_next) { 536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 537 break; 538 } 539 540 ifp->if_next = *ifap; 541 *ifap = ifp; 542 } 543 544 /* On success it returns ifp with increased reference count */ 545 546 static struct inet6_ifaddr * 547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 548 int scope, u32 flags) 549 { 550 struct inet6_ifaddr *ifa = NULL; 551 struct rt6_info *rt; 552 int hash; 553 int err = 0; 554 555 rcu_read_lock_bh(); 556 if (idev->dead) { 557 err = -ENODEV; /*XXX*/ 558 goto out2; 559 } 560 561 write_lock(&addrconf_hash_lock); 562 563 /* Ignore adding duplicate addresses on an interface */ 564 if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) { 565 ADBG(("ipv6_add_addr: already assigned\n")); 566 err = -EEXIST; 567 goto out; 568 } 569 570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 571 572 if (ifa == NULL) { 573 ADBG(("ipv6_add_addr: malloc failed\n")); 574 err = -ENOBUFS; 575 goto out; 576 } 577 578 rt = addrconf_dst_alloc(idev, addr, 0); 579 if (IS_ERR(rt)) { 580 err = PTR_ERR(rt); 581 goto out; 582 } 583 584 ipv6_addr_copy(&ifa->addr, addr); 585 586 spin_lock_init(&ifa->lock); 587 init_timer(&ifa->timer); 588 ifa->timer.data = (unsigned long) ifa; 589 ifa->scope = scope; 590 ifa->prefix_len = pfxlen; 591 ifa->flags = flags | IFA_F_TENTATIVE; 592 ifa->cstamp = ifa->tstamp = jiffies; 593 594 ifa->rt = rt; 595 596 /* 597 * part one of RFC 4429, section 3.3 598 * We should not configure an address as 599 * optimistic if we do not yet know the link 600 * layer address of our nexhop router 601 */ 602 603 if (rt->rt6i_nexthop == NULL) 604 ifa->flags &= ~IFA_F_OPTIMISTIC; 605 606 ifa->idev = idev; 607 in6_dev_hold(idev); 608 /* For caller */ 609 in6_ifa_hold(ifa); 610 611 /* Add to big hash table */ 612 hash = ipv6_addr_hash(addr); 613 614 ifa->lst_next = inet6_addr_lst[hash]; 615 inet6_addr_lst[hash] = ifa; 616 in6_ifa_hold(ifa); 617 write_unlock(&addrconf_hash_lock); 618 619 write_lock(&idev->lock); 620 /* Add to inet6_dev unicast addr list. */ 621 ipv6_link_dev_addr(idev, ifa); 622 623 #ifdef CONFIG_IPV6_PRIVACY 624 if (ifa->flags&IFA_F_TEMPORARY) { 625 ifa->tmp_next = idev->tempaddr_list; 626 idev->tempaddr_list = ifa; 627 in6_ifa_hold(ifa); 628 } 629 #endif 630 631 in6_ifa_hold(ifa); 632 write_unlock(&idev->lock); 633 out2: 634 rcu_read_unlock_bh(); 635 636 if (likely(err == 0)) 637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 638 else { 639 kfree(ifa); 640 ifa = ERR_PTR(err); 641 } 642 643 return ifa; 644 out: 645 write_unlock(&addrconf_hash_lock); 646 goto out2; 647 } 648 649 /* This function wants to get referenced ifp and releases it before return */ 650 651 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 652 { 653 struct inet6_ifaddr *ifa, **ifap; 654 struct inet6_dev *idev = ifp->idev; 655 int hash; 656 int deleted = 0, onlink = 0; 657 unsigned long expires = jiffies; 658 659 hash = ipv6_addr_hash(&ifp->addr); 660 661 ifp->dead = 1; 662 663 write_lock_bh(&addrconf_hash_lock); 664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 665 ifap = &ifa->lst_next) { 666 if (ifa == ifp) { 667 *ifap = ifa->lst_next; 668 __in6_ifa_put(ifp); 669 ifa->lst_next = NULL; 670 break; 671 } 672 } 673 write_unlock_bh(&addrconf_hash_lock); 674 675 write_lock_bh(&idev->lock); 676 #ifdef CONFIG_IPV6_PRIVACY 677 if (ifp->flags&IFA_F_TEMPORARY) { 678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 679 ifap = &ifa->tmp_next) { 680 if (ifa == ifp) { 681 *ifap = ifa->tmp_next; 682 if (ifp->ifpub) { 683 in6_ifa_put(ifp->ifpub); 684 ifp->ifpub = NULL; 685 } 686 __in6_ifa_put(ifp); 687 ifa->tmp_next = NULL; 688 break; 689 } 690 } 691 } 692 #endif 693 694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 695 if (ifa == ifp) { 696 *ifap = ifa->if_next; 697 __in6_ifa_put(ifp); 698 ifa->if_next = NULL; 699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 700 break; 701 deleted = 1; 702 continue; 703 } else if (ifp->flags & IFA_F_PERMANENT) { 704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 705 ifp->prefix_len)) { 706 if (ifa->flags & IFA_F_PERMANENT) { 707 onlink = 1; 708 if (deleted) 709 break; 710 } else { 711 unsigned long lifetime; 712 713 if (!onlink) 714 onlink = -1; 715 716 spin_lock(&ifa->lock); 717 lifetime = min_t(unsigned long, 718 ifa->valid_lft, 0x7fffffffUL/HZ); 719 if (time_before(expires, 720 ifa->tstamp + lifetime * HZ)) 721 expires = ifa->tstamp + lifetime * HZ; 722 spin_unlock(&ifa->lock); 723 } 724 } 725 } 726 ifap = &ifa->if_next; 727 } 728 write_unlock_bh(&idev->lock); 729 730 ipv6_ifa_notify(RTM_DELADDR, ifp); 731 732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 733 734 addrconf_del_timer(ifp); 735 736 /* 737 * Purge or update corresponding prefix 738 * 739 * 1) we don't purge prefix here if address was not permanent. 740 * prefix is managed by its own lifetime. 741 * 2) if there're no addresses, delete prefix. 742 * 3) if there're still other permanent address(es), 743 * corresponding prefix is still permanent. 744 * 4) otherwise, update prefix lifetime to the 745 * longest valid lifetime among the corresponding 746 * addresses on the device. 747 * Note: subsequent RA will update lifetime. 748 * 749 * --yoshfuji 750 */ 751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 752 struct in6_addr prefix; 753 struct rt6_info *rt; 754 755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 756 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 757 758 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 759 if (onlink == 0) { 760 ip6_del_rt(rt); 761 rt = NULL; 762 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 763 rt->rt6i_expires = expires; 764 rt->rt6i_flags |= RTF_EXPIRES; 765 } 766 } 767 dst_release(&rt->u.dst); 768 } 769 770 in6_ifa_put(ifp); 771 } 772 773 #ifdef CONFIG_IPV6_PRIVACY 774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 775 { 776 struct inet6_dev *idev = ifp->idev; 777 struct in6_addr addr, *tmpaddr; 778 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 779 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 struct ipv6_saddr_score { 897 int addr_type; 898 unsigned int attrs; 899 int matchlen; 900 int scope; 901 unsigned int rule; 902 }; 903 904 #define IPV6_SADDR_SCORE_LOCAL 0x0001 905 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 906 #define IPV6_SADDR_SCORE_HOA 0x0008 907 #define IPV6_SADDR_SCORE_OIF 0x0010 908 #define IPV6_SADDR_SCORE_LABEL 0x0020 909 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 910 911 static inline int ipv6_saddr_preferred(int type) 912 { 913 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 914 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 915 return 1; 916 return 0; 917 } 918 919 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 920 struct in6_addr *daddr, struct in6_addr *saddr) 921 { 922 struct ipv6_saddr_score hiscore; 923 struct inet6_ifaddr *ifa_result = NULL; 924 int daddr_type = __ipv6_addr_type(daddr); 925 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 926 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0; 927 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex); 928 struct net_device *dev; 929 930 memset(&hiscore, 0, sizeof(hiscore)); 931 932 read_lock(&dev_base_lock); 933 rcu_read_lock(); 934 935 for_each_netdev(&init_net, dev) { 936 struct inet6_dev *idev; 937 struct inet6_ifaddr *ifa; 938 939 /* Rule 0: Candidate Source Address (section 4) 940 * - multicast and link-local destination address, 941 * the set of candidate source address MUST only 942 * include addresses assigned to interfaces 943 * belonging to the same link as the outgoing 944 * interface. 945 * (- For site-local destination addresses, the 946 * set of candidate source addresses MUST only 947 * include addresses assigned to interfaces 948 * belonging to the same site as the outgoing 949 * interface.) 950 */ 951 if ((daddr_type & IPV6_ADDR_MULTICAST || 952 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 953 daddr_dev && dev != daddr_dev) 954 continue; 955 956 idev = __in6_dev_get(dev); 957 if (!idev) 958 continue; 959 960 read_lock_bh(&idev->lock); 961 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 962 struct ipv6_saddr_score score; 963 964 score.addr_type = __ipv6_addr_type(&ifa->addr); 965 966 /* Rule 0: 967 * - Tentative Address (RFC2462 section 5.4) 968 * - A tentative address is not considered 969 * "assigned to an interface" in the traditional 970 * sense, unless it is also flagged as optimistic. 971 * - Candidate Source Address (section 4) 972 * - In any case, anycast addresses, multicast 973 * addresses, and the unspecified address MUST 974 * NOT be included in a candidate set. 975 */ 976 if ((ifa->flags & IFA_F_TENTATIVE) && 977 (!(ifa->flags & IFA_F_OPTIMISTIC))) 978 continue; 979 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 980 score.addr_type & IPV6_ADDR_MULTICAST)) { 981 LIMIT_NETDEBUG(KERN_DEBUG 982 "ADDRCONF: unspecified / multicast address " 983 "assigned as unicast address on %s", 984 dev->name); 985 continue; 986 } 987 988 score.attrs = 0; 989 score.matchlen = 0; 990 score.scope = 0; 991 score.rule = 0; 992 993 if (ifa_result == NULL) { 994 /* record it if the first available entry */ 995 goto record_it; 996 } 997 998 /* Rule 1: Prefer same address */ 999 if (hiscore.rule < 1) { 1000 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 1001 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 1002 hiscore.rule++; 1003 } 1004 if (ipv6_addr_equal(&ifa->addr, daddr)) { 1005 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 1006 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 1007 score.rule = 1; 1008 goto record_it; 1009 } 1010 } else { 1011 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 1012 continue; 1013 } 1014 1015 /* Rule 2: Prefer appropriate scope */ 1016 if (hiscore.rule < 2) { 1017 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 1018 hiscore.rule++; 1019 } 1020 score.scope = __ipv6_addr_src_scope(score.addr_type); 1021 if (hiscore.scope < score.scope) { 1022 if (hiscore.scope < daddr_scope) { 1023 score.rule = 2; 1024 goto record_it; 1025 } else 1026 continue; 1027 } else if (score.scope < hiscore.scope) { 1028 if (score.scope < daddr_scope) 1029 break; /* addresses sorted by scope */ 1030 else { 1031 score.rule = 2; 1032 goto record_it; 1033 } 1034 } 1035 1036 /* Rule 3: Avoid deprecated and optimistic addresses */ 1037 if (hiscore.rule < 3) { 1038 if (ipv6_saddr_preferred(hiscore.addr_type) || 1039 (((ifa_result->flags & 1040 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) 1041 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1042 hiscore.rule++; 1043 } 1044 if (ipv6_saddr_preferred(score.addr_type) || 1045 (((ifa->flags & 1046 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) { 1047 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1048 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 1049 score.rule = 3; 1050 goto record_it; 1051 } 1052 } else { 1053 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 1054 continue; 1055 } 1056 1057 /* Rule 4: Prefer home address */ 1058 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 1059 if (hiscore.rule < 4) { 1060 if (ifa_result->flags & IFA_F_HOMEADDRESS) 1061 hiscore.attrs |= IPV6_SADDR_SCORE_HOA; 1062 hiscore.rule++; 1063 } 1064 if (ifa->flags & IFA_F_HOMEADDRESS) { 1065 score.attrs |= IPV6_SADDR_SCORE_HOA; 1066 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) { 1067 score.rule = 4; 1068 goto record_it; 1069 } 1070 } else { 1071 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA) 1072 continue; 1073 } 1074 #else 1075 if (hiscore.rule < 4) 1076 hiscore.rule++; 1077 #endif 1078 1079 /* Rule 5: Prefer outgoing interface */ 1080 if (hiscore.rule < 5) { 1081 if (daddr_dev == NULL || 1082 daddr_dev == ifa_result->idev->dev) 1083 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1084 hiscore.rule++; 1085 } 1086 if (daddr_dev == NULL || 1087 daddr_dev == ifa->idev->dev) { 1088 score.attrs |= IPV6_SADDR_SCORE_OIF; 1089 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1090 score.rule = 5; 1091 goto record_it; 1092 } 1093 } else { 1094 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1095 continue; 1096 } 1097 1098 /* Rule 6: Prefer matching label */ 1099 if (hiscore.rule < 6) { 1100 if (ipv6_addr_label(&ifa_result->addr, 1101 hiscore.addr_type, 1102 ifa_result->idev->dev->ifindex) == daddr_label) 1103 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1104 hiscore.rule++; 1105 } 1106 if (ipv6_addr_label(&ifa->addr, 1107 score.addr_type, 1108 ifa->idev->dev->ifindex) == daddr_label) { 1109 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1110 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1111 score.rule = 6; 1112 goto record_it; 1113 } 1114 } else { 1115 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1116 continue; 1117 } 1118 1119 #ifdef CONFIG_IPV6_PRIVACY 1120 /* Rule 7: Prefer public address 1121 * Note: prefer temprary address if use_tempaddr >= 2 1122 */ 1123 if (hiscore.rule < 7) { 1124 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1125 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1126 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1127 hiscore.rule++; 1128 } 1129 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1130 (ifa->idev->cnf.use_tempaddr >= 2)) { 1131 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1132 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1133 score.rule = 7; 1134 goto record_it; 1135 } 1136 } else { 1137 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1138 continue; 1139 } 1140 #else 1141 if (hiscore.rule < 7) 1142 hiscore.rule++; 1143 #endif 1144 /* Rule 8: Use longest matching prefix */ 1145 if (hiscore.rule < 8) { 1146 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1147 hiscore.rule++; 1148 } 1149 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1150 if (score.matchlen > hiscore.matchlen) { 1151 score.rule = 8; 1152 goto record_it; 1153 } 1154 #if 0 1155 else if (score.matchlen < hiscore.matchlen) 1156 continue; 1157 #endif 1158 1159 /* Final Rule: choose first available one */ 1160 continue; 1161 record_it: 1162 if (ifa_result) 1163 in6_ifa_put(ifa_result); 1164 in6_ifa_hold(ifa); 1165 ifa_result = ifa; 1166 hiscore = score; 1167 } 1168 read_unlock_bh(&idev->lock); 1169 } 1170 rcu_read_unlock(); 1171 read_unlock(&dev_base_lock); 1172 1173 if (!ifa_result) 1174 return -EADDRNOTAVAIL; 1175 1176 ipv6_addr_copy(saddr, &ifa_result->addr); 1177 in6_ifa_put(ifa_result); 1178 return 0; 1179 } 1180 1181 1182 int ipv6_get_saddr(struct dst_entry *dst, 1183 struct in6_addr *daddr, struct in6_addr *saddr) 1184 { 1185 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr); 1186 } 1187 1188 EXPORT_SYMBOL(ipv6_get_saddr); 1189 1190 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1191 unsigned char banned_flags) 1192 { 1193 struct inet6_dev *idev; 1194 int err = -EADDRNOTAVAIL; 1195 1196 rcu_read_lock(); 1197 if ((idev = __in6_dev_get(dev)) != NULL) { 1198 struct inet6_ifaddr *ifp; 1199 1200 read_lock_bh(&idev->lock); 1201 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1202 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) { 1203 ipv6_addr_copy(addr, &ifp->addr); 1204 err = 0; 1205 break; 1206 } 1207 } 1208 read_unlock_bh(&idev->lock); 1209 } 1210 rcu_read_unlock(); 1211 return err; 1212 } 1213 1214 static int ipv6_count_addresses(struct inet6_dev *idev) 1215 { 1216 int cnt = 0; 1217 struct inet6_ifaddr *ifp; 1218 1219 read_lock_bh(&idev->lock); 1220 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1221 cnt++; 1222 read_unlock_bh(&idev->lock); 1223 return cnt; 1224 } 1225 1226 int ipv6_chk_addr(struct net *net, struct in6_addr *addr, 1227 struct net_device *dev, int strict) 1228 { 1229 struct inet6_ifaddr * ifp; 1230 u8 hash = ipv6_addr_hash(addr); 1231 1232 read_lock_bh(&addrconf_hash_lock); 1233 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1234 if (ifp->idev->dev->nd_net != net) 1235 continue; 1236 if (ipv6_addr_equal(&ifp->addr, addr) && 1237 !(ifp->flags&IFA_F_TENTATIVE)) { 1238 if (dev == NULL || ifp->idev->dev == dev || 1239 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1240 break; 1241 } 1242 } 1243 read_unlock_bh(&addrconf_hash_lock); 1244 return ifp != NULL; 1245 } 1246 EXPORT_SYMBOL(ipv6_chk_addr); 1247 1248 static 1249 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1250 struct net_device *dev) 1251 { 1252 struct inet6_ifaddr * ifp; 1253 u8 hash = ipv6_addr_hash(addr); 1254 1255 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1256 if (ifp->idev->dev->nd_net != net) 1257 continue; 1258 if (ipv6_addr_equal(&ifp->addr, addr)) { 1259 if (dev == NULL || ifp->idev->dev == dev) 1260 break; 1261 } 1262 } 1263 return ifp != NULL; 1264 } 1265 1266 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr, 1267 struct net_device *dev, int strict) 1268 { 1269 struct inet6_ifaddr * ifp; 1270 u8 hash = ipv6_addr_hash(addr); 1271 1272 read_lock_bh(&addrconf_hash_lock); 1273 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1274 if (ifp->idev->dev->nd_net != net) 1275 continue; 1276 if (ipv6_addr_equal(&ifp->addr, addr)) { 1277 if (dev == NULL || ifp->idev->dev == dev || 1278 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1279 in6_ifa_hold(ifp); 1280 break; 1281 } 1282 } 1283 } 1284 read_unlock_bh(&addrconf_hash_lock); 1285 1286 return ifp; 1287 } 1288 1289 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1290 { 1291 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1292 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1293 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1294 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1295 int sk_ipv6only = ipv6_only_sock(sk); 1296 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1297 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1298 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1299 1300 if (!sk2_rcv_saddr && !sk_ipv6only) 1301 return 1; 1302 1303 if (addr_type2 == IPV6_ADDR_ANY && 1304 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1305 return 1; 1306 1307 if (addr_type == IPV6_ADDR_ANY && 1308 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1309 return 1; 1310 1311 if (sk2_rcv_saddr6 && 1312 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1313 return 1; 1314 1315 if (addr_type == IPV6_ADDR_MAPPED && 1316 !sk2_ipv6only && 1317 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1318 return 1; 1319 1320 return 0; 1321 } 1322 1323 /* Gets referenced address, destroys ifaddr */ 1324 1325 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1326 { 1327 if (ifp->flags&IFA_F_PERMANENT) { 1328 spin_lock_bh(&ifp->lock); 1329 addrconf_del_timer(ifp); 1330 ifp->flags |= IFA_F_TENTATIVE; 1331 spin_unlock_bh(&ifp->lock); 1332 in6_ifa_put(ifp); 1333 #ifdef CONFIG_IPV6_PRIVACY 1334 } else if (ifp->flags&IFA_F_TEMPORARY) { 1335 struct inet6_ifaddr *ifpub; 1336 spin_lock_bh(&ifp->lock); 1337 ifpub = ifp->ifpub; 1338 if (ifpub) { 1339 in6_ifa_hold(ifpub); 1340 spin_unlock_bh(&ifp->lock); 1341 ipv6_create_tempaddr(ifpub, ifp); 1342 in6_ifa_put(ifpub); 1343 } else { 1344 spin_unlock_bh(&ifp->lock); 1345 } 1346 ipv6_del_addr(ifp); 1347 #endif 1348 } else 1349 ipv6_del_addr(ifp); 1350 } 1351 1352 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1353 { 1354 if (net_ratelimit()) 1355 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1356 addrconf_dad_stop(ifp); 1357 } 1358 1359 /* Join to solicited addr multicast group. */ 1360 1361 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1362 { 1363 struct in6_addr maddr; 1364 1365 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1366 return; 1367 1368 addrconf_addr_solict_mult(addr, &maddr); 1369 ipv6_dev_mc_inc(dev, &maddr); 1370 } 1371 1372 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1373 { 1374 struct in6_addr maddr; 1375 1376 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1377 return; 1378 1379 addrconf_addr_solict_mult(addr, &maddr); 1380 __ipv6_dev_mc_dec(idev, &maddr); 1381 } 1382 1383 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1384 { 1385 struct in6_addr addr; 1386 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1387 if (ipv6_addr_any(&addr)) 1388 return; 1389 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1390 } 1391 1392 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1393 { 1394 struct in6_addr addr; 1395 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1396 if (ipv6_addr_any(&addr)) 1397 return; 1398 __ipv6_dev_ac_dec(ifp->idev, &addr); 1399 } 1400 1401 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1402 { 1403 if (dev->addr_len != ETH_ALEN) 1404 return -1; 1405 memcpy(eui, dev->dev_addr, 3); 1406 memcpy(eui + 5, dev->dev_addr + 3, 3); 1407 1408 /* 1409 * The zSeries OSA network cards can be shared among various 1410 * OS instances, but the OSA cards have only one MAC address. 1411 * This leads to duplicate address conflicts in conjunction 1412 * with IPv6 if more than one instance uses the same card. 1413 * 1414 * The driver for these cards can deliver a unique 16-bit 1415 * identifier for each instance sharing the same card. It is 1416 * placed instead of 0xFFFE in the interface identifier. The 1417 * "u" bit of the interface identifier is not inverted in this 1418 * case. Hence the resulting interface identifier has local 1419 * scope according to RFC2373. 1420 */ 1421 if (dev->dev_id) { 1422 eui[3] = (dev->dev_id >> 8) & 0xFF; 1423 eui[4] = dev->dev_id & 0xFF; 1424 } else { 1425 eui[3] = 0xFF; 1426 eui[4] = 0xFE; 1427 eui[0] ^= 2; 1428 } 1429 return 0; 1430 } 1431 1432 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1433 { 1434 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1435 if (dev->addr_len != ARCNET_ALEN) 1436 return -1; 1437 memset(eui, 0, 7); 1438 eui[7] = *(u8*)dev->dev_addr; 1439 return 0; 1440 } 1441 1442 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1443 { 1444 if (dev->addr_len != INFINIBAND_ALEN) 1445 return -1; 1446 memcpy(eui, dev->dev_addr + 12, 8); 1447 eui[0] |= 2; 1448 return 0; 1449 } 1450 1451 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1452 { 1453 switch (dev->type) { 1454 case ARPHRD_ETHER: 1455 case ARPHRD_FDDI: 1456 case ARPHRD_IEEE802_TR: 1457 return addrconf_ifid_eui48(eui, dev); 1458 case ARPHRD_ARCNET: 1459 return addrconf_ifid_arcnet(eui, dev); 1460 case ARPHRD_INFINIBAND: 1461 return addrconf_ifid_infiniband(eui, dev); 1462 case ARPHRD_SIT: 1463 if (dev->priv_flags & IFF_ISATAP) 1464 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr); 1465 } 1466 return -1; 1467 } 1468 1469 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1470 { 1471 int err = -1; 1472 struct inet6_ifaddr *ifp; 1473 1474 read_lock_bh(&idev->lock); 1475 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1476 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1477 memcpy(eui, ifp->addr.s6_addr+8, 8); 1478 err = 0; 1479 break; 1480 } 1481 } 1482 read_unlock_bh(&idev->lock); 1483 return err; 1484 } 1485 1486 #ifdef CONFIG_IPV6_PRIVACY 1487 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1488 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1489 { 1490 regen: 1491 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1492 idev->rndid[0] &= ~0x02; 1493 1494 /* 1495 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1496 * check if generated address is not inappropriate 1497 * 1498 * - Reserved subnet anycast (RFC 2526) 1499 * 11111101 11....11 1xxxxxxx 1500 * - ISATAP (RFC4214) 6.1 1501 * 00-00-5E-FE-xx-xx-xx-xx 1502 * - value 0 1503 * - XXX: already assigned to an address on the device 1504 */ 1505 if (idev->rndid[0] == 0xfd && 1506 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1507 (idev->rndid[7]&0x80)) 1508 goto regen; 1509 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1510 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1511 goto regen; 1512 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1513 goto regen; 1514 } 1515 1516 return 0; 1517 } 1518 1519 static void ipv6_regen_rndid(unsigned long data) 1520 { 1521 struct inet6_dev *idev = (struct inet6_dev *) data; 1522 unsigned long expires; 1523 1524 rcu_read_lock_bh(); 1525 write_lock_bh(&idev->lock); 1526 1527 if (idev->dead) 1528 goto out; 1529 1530 if (__ipv6_regen_rndid(idev) < 0) 1531 goto out; 1532 1533 expires = jiffies + 1534 idev->cnf.temp_prefered_lft * HZ - 1535 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1536 if (time_before(expires, jiffies)) { 1537 printk(KERN_WARNING 1538 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1539 idev->dev->name); 1540 goto out; 1541 } 1542 1543 if (!mod_timer(&idev->regen_timer, expires)) 1544 in6_dev_hold(idev); 1545 1546 out: 1547 write_unlock_bh(&idev->lock); 1548 rcu_read_unlock_bh(); 1549 in6_dev_put(idev); 1550 } 1551 1552 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1553 int ret = 0; 1554 1555 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1556 ret = __ipv6_regen_rndid(idev); 1557 return ret; 1558 } 1559 #endif 1560 1561 /* 1562 * Add prefix route. 1563 */ 1564 1565 static void 1566 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1567 unsigned long expires, u32 flags) 1568 { 1569 struct fib6_config cfg = { 1570 .fc_table = RT6_TABLE_PREFIX, 1571 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1572 .fc_ifindex = dev->ifindex, 1573 .fc_expires = expires, 1574 .fc_dst_len = plen, 1575 .fc_flags = RTF_UP | flags, 1576 .fc_nlinfo.nl_net = &init_net, 1577 }; 1578 1579 ipv6_addr_copy(&cfg.fc_dst, pfx); 1580 1581 /* Prevent useless cloning on PtP SIT. 1582 This thing is done here expecting that the whole 1583 class of non-broadcast devices need not cloning. 1584 */ 1585 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1586 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1587 cfg.fc_flags |= RTF_NONEXTHOP; 1588 #endif 1589 1590 ip6_route_add(&cfg); 1591 } 1592 1593 /* Create "default" multicast route to the interface */ 1594 1595 static void addrconf_add_mroute(struct net_device *dev) 1596 { 1597 struct fib6_config cfg = { 1598 .fc_table = RT6_TABLE_LOCAL, 1599 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1600 .fc_ifindex = dev->ifindex, 1601 .fc_dst_len = 8, 1602 .fc_flags = RTF_UP, 1603 .fc_nlinfo.nl_net = &init_net, 1604 }; 1605 1606 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1607 1608 ip6_route_add(&cfg); 1609 } 1610 1611 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1612 static void sit_route_add(struct net_device *dev) 1613 { 1614 struct fib6_config cfg = { 1615 .fc_table = RT6_TABLE_MAIN, 1616 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1617 .fc_ifindex = dev->ifindex, 1618 .fc_dst_len = 96, 1619 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1620 .fc_nlinfo.nl_net = &init_net, 1621 }; 1622 1623 /* prefix length - 96 bits "::d.d.d.d" */ 1624 ip6_route_add(&cfg); 1625 } 1626 #endif 1627 1628 static void addrconf_add_lroute(struct net_device *dev) 1629 { 1630 struct in6_addr addr; 1631 1632 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1633 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1634 } 1635 1636 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1637 { 1638 struct inet6_dev *idev; 1639 1640 ASSERT_RTNL(); 1641 1642 if ((idev = ipv6_find_idev(dev)) == NULL) 1643 return NULL; 1644 1645 /* Add default multicast route */ 1646 addrconf_add_mroute(dev); 1647 1648 /* Add link local route */ 1649 addrconf_add_lroute(dev); 1650 return idev; 1651 } 1652 1653 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1654 { 1655 struct prefix_info *pinfo; 1656 __u32 valid_lft; 1657 __u32 prefered_lft; 1658 int addr_type; 1659 unsigned long rt_expires; 1660 struct inet6_dev *in6_dev; 1661 1662 pinfo = (struct prefix_info *) opt; 1663 1664 if (len < sizeof(struct prefix_info)) { 1665 ADBG(("addrconf: prefix option too short\n")); 1666 return; 1667 } 1668 1669 /* 1670 * Validation checks ([ADDRCONF], page 19) 1671 */ 1672 1673 addr_type = ipv6_addr_type(&pinfo->prefix); 1674 1675 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1676 return; 1677 1678 valid_lft = ntohl(pinfo->valid); 1679 prefered_lft = ntohl(pinfo->prefered); 1680 1681 if (prefered_lft > valid_lft) { 1682 if (net_ratelimit()) 1683 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1684 return; 1685 } 1686 1687 in6_dev = in6_dev_get(dev); 1688 1689 if (in6_dev == NULL) { 1690 if (net_ratelimit()) 1691 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1692 return; 1693 } 1694 1695 /* 1696 * Two things going on here: 1697 * 1) Add routes for on-link prefixes 1698 * 2) Configure prefixes with the auto flag set 1699 */ 1700 1701 /* Avoid arithmetic overflow. Really, we could 1702 save rt_expires in seconds, likely valid_lft, 1703 but it would require division in fib gc, that it 1704 not good. 1705 */ 1706 if (valid_lft >= 0x7FFFFFFF/HZ) 1707 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1708 else 1709 rt_expires = valid_lft * HZ; 1710 1711 /* 1712 * We convert this (in jiffies) to clock_t later. 1713 * Avoid arithmetic overflow there as well. 1714 * Overflow can happen only if HZ < USER_HZ. 1715 */ 1716 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1717 rt_expires = 0x7FFFFFFF / USER_HZ; 1718 1719 if (pinfo->onlink) { 1720 struct rt6_info *rt; 1721 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1722 1723 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1724 if (rt->rt6i_flags&RTF_EXPIRES) { 1725 if (valid_lft == 0) { 1726 ip6_del_rt(rt); 1727 rt = NULL; 1728 } else { 1729 rt->rt6i_expires = jiffies + rt_expires; 1730 } 1731 } 1732 } else if (valid_lft) { 1733 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1734 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1735 } 1736 if (rt) 1737 dst_release(&rt->u.dst); 1738 } 1739 1740 /* Try to figure out our local address for this prefix */ 1741 1742 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1743 struct inet6_ifaddr * ifp; 1744 struct in6_addr addr; 1745 int create = 0, update_lft = 0; 1746 1747 if (pinfo->prefix_len == 64) { 1748 memcpy(&addr, &pinfo->prefix, 8); 1749 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1750 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1751 in6_dev_put(in6_dev); 1752 return; 1753 } 1754 goto ok; 1755 } 1756 if (net_ratelimit()) 1757 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1758 pinfo->prefix_len); 1759 in6_dev_put(in6_dev); 1760 return; 1761 1762 ok: 1763 1764 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1); 1765 1766 if (ifp == NULL && valid_lft) { 1767 int max_addresses = in6_dev->cnf.max_addresses; 1768 u32 addr_flags = 0; 1769 1770 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1771 if (in6_dev->cnf.optimistic_dad && 1772 !ipv6_devconf.forwarding) 1773 addr_flags = IFA_F_OPTIMISTIC; 1774 #endif 1775 1776 /* Do not allow to create too much of autoconfigured 1777 * addresses; this would be too easy way to crash kernel. 1778 */ 1779 if (!max_addresses || 1780 ipv6_count_addresses(in6_dev) < max_addresses) 1781 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1782 addr_type&IPV6_ADDR_SCOPE_MASK, 1783 addr_flags); 1784 1785 if (!ifp || IS_ERR(ifp)) { 1786 in6_dev_put(in6_dev); 1787 return; 1788 } 1789 1790 update_lft = create = 1; 1791 ifp->cstamp = jiffies; 1792 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1793 } 1794 1795 if (ifp) { 1796 int flags; 1797 unsigned long now; 1798 #ifdef CONFIG_IPV6_PRIVACY 1799 struct inet6_ifaddr *ift; 1800 #endif 1801 u32 stored_lft; 1802 1803 /* update lifetime (RFC2462 5.5.3 e) */ 1804 spin_lock(&ifp->lock); 1805 now = jiffies; 1806 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1807 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1808 else 1809 stored_lft = 0; 1810 if (!update_lft && stored_lft) { 1811 if (valid_lft > MIN_VALID_LIFETIME || 1812 valid_lft > stored_lft) 1813 update_lft = 1; 1814 else if (stored_lft <= MIN_VALID_LIFETIME) { 1815 /* valid_lft <= stored_lft is always true */ 1816 /* XXX: IPsec */ 1817 update_lft = 0; 1818 } else { 1819 valid_lft = MIN_VALID_LIFETIME; 1820 if (valid_lft < prefered_lft) 1821 prefered_lft = valid_lft; 1822 update_lft = 1; 1823 } 1824 } 1825 1826 if (update_lft) { 1827 ifp->valid_lft = valid_lft; 1828 ifp->prefered_lft = prefered_lft; 1829 ifp->tstamp = now; 1830 flags = ifp->flags; 1831 ifp->flags &= ~IFA_F_DEPRECATED; 1832 spin_unlock(&ifp->lock); 1833 1834 if (!(flags&IFA_F_TENTATIVE)) 1835 ipv6_ifa_notify(0, ifp); 1836 } else 1837 spin_unlock(&ifp->lock); 1838 1839 #ifdef CONFIG_IPV6_PRIVACY 1840 read_lock_bh(&in6_dev->lock); 1841 /* update all temporary addresses in the list */ 1842 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1843 /* 1844 * When adjusting the lifetimes of an existing 1845 * temporary address, only lower the lifetimes. 1846 * Implementations must not increase the 1847 * lifetimes of an existing temporary address 1848 * when processing a Prefix Information Option. 1849 */ 1850 if (ifp != ift->ifpub) 1851 continue; 1852 1853 spin_lock(&ift->lock); 1854 flags = ift->flags; 1855 if (ift->valid_lft > valid_lft && 1856 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1857 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1858 if (ift->prefered_lft > prefered_lft && 1859 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1860 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1861 spin_unlock(&ift->lock); 1862 if (!(flags&IFA_F_TENTATIVE)) 1863 ipv6_ifa_notify(0, ift); 1864 } 1865 1866 if (create && in6_dev->cnf.use_tempaddr > 0) { 1867 /* 1868 * When a new public address is created as described in [ADDRCONF], 1869 * also create a new temporary address. 1870 */ 1871 read_unlock_bh(&in6_dev->lock); 1872 ipv6_create_tempaddr(ifp, NULL); 1873 } else { 1874 read_unlock_bh(&in6_dev->lock); 1875 } 1876 #endif 1877 in6_ifa_put(ifp); 1878 addrconf_verify(0); 1879 } 1880 } 1881 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1882 in6_dev_put(in6_dev); 1883 } 1884 1885 /* 1886 * Set destination address. 1887 * Special case for SIT interfaces where we create a new "virtual" 1888 * device. 1889 */ 1890 int addrconf_set_dstaddr(void __user *arg) 1891 { 1892 struct in6_ifreq ireq; 1893 struct net_device *dev; 1894 int err = -EINVAL; 1895 1896 rtnl_lock(); 1897 1898 err = -EFAULT; 1899 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1900 goto err_exit; 1901 1902 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex); 1903 1904 err = -ENODEV; 1905 if (dev == NULL) 1906 goto err_exit; 1907 1908 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1909 if (dev->type == ARPHRD_SIT) { 1910 struct ifreq ifr; 1911 mm_segment_t oldfs; 1912 struct ip_tunnel_parm p; 1913 1914 err = -EADDRNOTAVAIL; 1915 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1916 goto err_exit; 1917 1918 memset(&p, 0, sizeof(p)); 1919 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1920 p.iph.saddr = 0; 1921 p.iph.version = 4; 1922 p.iph.ihl = 5; 1923 p.iph.protocol = IPPROTO_IPV6; 1924 p.iph.ttl = 64; 1925 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 1926 1927 oldfs = get_fs(); set_fs(KERNEL_DS); 1928 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1929 set_fs(oldfs); 1930 1931 if (err == 0) { 1932 err = -ENOBUFS; 1933 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL) 1934 goto err_exit; 1935 err = dev_open(dev); 1936 } 1937 } 1938 #endif 1939 1940 err_exit: 1941 rtnl_unlock(); 1942 return err; 1943 } 1944 1945 /* 1946 * Manual configuration of address on an interface 1947 */ 1948 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1949 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft) 1950 { 1951 struct inet6_ifaddr *ifp; 1952 struct inet6_dev *idev; 1953 struct net_device *dev; 1954 int scope; 1955 u32 flags = RTF_EXPIRES; 1956 1957 ASSERT_RTNL(); 1958 1959 /* check the lifetime */ 1960 if (!valid_lft || prefered_lft > valid_lft) 1961 return -EINVAL; 1962 1963 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL) 1964 return -ENODEV; 1965 1966 if ((idev = addrconf_add_dev(dev)) == NULL) 1967 return -ENOBUFS; 1968 1969 scope = ipv6_addr_scope(pfx); 1970 1971 if (valid_lft == INFINITY_LIFE_TIME) { 1972 ifa_flags |= IFA_F_PERMANENT; 1973 flags = 0; 1974 } else if (valid_lft >= 0x7FFFFFFF/HZ) 1975 valid_lft = 0x7FFFFFFF/HZ; 1976 1977 if (prefered_lft == 0) 1978 ifa_flags |= IFA_F_DEPRECATED; 1979 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1980 (prefered_lft != INFINITY_LIFE_TIME)) 1981 prefered_lft = 0x7FFFFFFF/HZ; 1982 1983 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1984 1985 if (!IS_ERR(ifp)) { 1986 spin_lock_bh(&ifp->lock); 1987 ifp->valid_lft = valid_lft; 1988 ifp->prefered_lft = prefered_lft; 1989 ifp->tstamp = jiffies; 1990 spin_unlock_bh(&ifp->lock); 1991 1992 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 1993 jiffies_to_clock_t(valid_lft * HZ), flags); 1994 /* 1995 * Note that section 3.1 of RFC 4429 indicates 1996 * that the Optimistic flag should not be set for 1997 * manually configured addresses 1998 */ 1999 addrconf_dad_start(ifp, 0); 2000 in6_ifa_put(ifp); 2001 addrconf_verify(0); 2002 return 0; 2003 } 2004 2005 return PTR_ERR(ifp); 2006 } 2007 2008 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 2009 { 2010 struct inet6_ifaddr *ifp; 2011 struct inet6_dev *idev; 2012 struct net_device *dev; 2013 2014 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL) 2015 return -ENODEV; 2016 2017 if ((idev = __in6_dev_get(dev)) == NULL) 2018 return -ENXIO; 2019 2020 read_lock_bh(&idev->lock); 2021 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 2022 if (ifp->prefix_len == plen && 2023 ipv6_addr_equal(pfx, &ifp->addr)) { 2024 in6_ifa_hold(ifp); 2025 read_unlock_bh(&idev->lock); 2026 2027 ipv6_del_addr(ifp); 2028 2029 /* If the last address is deleted administratively, 2030 disable IPv6 on this interface. 2031 */ 2032 if (idev->addr_list == NULL) 2033 addrconf_ifdown(idev->dev, 1); 2034 return 0; 2035 } 2036 } 2037 read_unlock_bh(&idev->lock); 2038 return -EADDRNOTAVAIL; 2039 } 2040 2041 2042 int addrconf_add_ifaddr(void __user *arg) 2043 { 2044 struct in6_ifreq ireq; 2045 int err; 2046 2047 if (!capable(CAP_NET_ADMIN)) 2048 return -EPERM; 2049 2050 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2051 return -EFAULT; 2052 2053 rtnl_lock(); 2054 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 2055 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2056 rtnl_unlock(); 2057 return err; 2058 } 2059 2060 int addrconf_del_ifaddr(void __user *arg) 2061 { 2062 struct in6_ifreq ireq; 2063 int err; 2064 2065 if (!capable(CAP_NET_ADMIN)) 2066 return -EPERM; 2067 2068 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2069 return -EFAULT; 2070 2071 rtnl_lock(); 2072 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 2073 rtnl_unlock(); 2074 return err; 2075 } 2076 2077 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2078 static void sit_add_v4_addrs(struct inet6_dev *idev) 2079 { 2080 struct inet6_ifaddr * ifp; 2081 struct in6_addr addr; 2082 struct net_device *dev; 2083 int scope; 2084 2085 ASSERT_RTNL(); 2086 2087 memset(&addr, 0, sizeof(struct in6_addr)); 2088 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2089 2090 if (idev->dev->flags&IFF_POINTOPOINT) { 2091 addr.s6_addr32[0] = htonl(0xfe800000); 2092 scope = IFA_LINK; 2093 } else { 2094 scope = IPV6_ADDR_COMPATv4; 2095 } 2096 2097 if (addr.s6_addr32[3]) { 2098 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2099 if (!IS_ERR(ifp)) { 2100 spin_lock_bh(&ifp->lock); 2101 ifp->flags &= ~IFA_F_TENTATIVE; 2102 spin_unlock_bh(&ifp->lock); 2103 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2104 in6_ifa_put(ifp); 2105 } 2106 return; 2107 } 2108 2109 for_each_netdev(&init_net, dev) { 2110 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2111 if (in_dev && (dev->flags & IFF_UP)) { 2112 struct in_ifaddr * ifa; 2113 2114 int flag = scope; 2115 2116 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2117 int plen; 2118 2119 addr.s6_addr32[3] = ifa->ifa_local; 2120 2121 if (ifa->ifa_scope == RT_SCOPE_LINK) 2122 continue; 2123 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2124 if (idev->dev->flags&IFF_POINTOPOINT) 2125 continue; 2126 flag |= IFA_HOST; 2127 } 2128 if (idev->dev->flags&IFF_POINTOPOINT) 2129 plen = 64; 2130 else 2131 plen = 96; 2132 2133 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2134 IFA_F_PERMANENT); 2135 if (!IS_ERR(ifp)) { 2136 spin_lock_bh(&ifp->lock); 2137 ifp->flags &= ~IFA_F_TENTATIVE; 2138 spin_unlock_bh(&ifp->lock); 2139 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2140 in6_ifa_put(ifp); 2141 } 2142 } 2143 } 2144 } 2145 } 2146 #endif 2147 2148 static void init_loopback(struct net_device *dev) 2149 { 2150 struct inet6_dev *idev; 2151 struct inet6_ifaddr * ifp; 2152 2153 /* ::1 */ 2154 2155 ASSERT_RTNL(); 2156 2157 if ((idev = ipv6_find_idev(dev)) == NULL) { 2158 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2159 return; 2160 } 2161 2162 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2163 if (!IS_ERR(ifp)) { 2164 spin_lock_bh(&ifp->lock); 2165 ifp->flags &= ~IFA_F_TENTATIVE; 2166 spin_unlock_bh(&ifp->lock); 2167 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2168 in6_ifa_put(ifp); 2169 } 2170 } 2171 2172 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2173 { 2174 struct inet6_ifaddr * ifp; 2175 u32 addr_flags = IFA_F_PERMANENT; 2176 2177 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2178 if (idev->cnf.optimistic_dad && 2179 !ipv6_devconf.forwarding) 2180 addr_flags |= IFA_F_OPTIMISTIC; 2181 #endif 2182 2183 2184 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2185 if (!IS_ERR(ifp)) { 2186 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2187 addrconf_dad_start(ifp, 0); 2188 in6_ifa_put(ifp); 2189 } 2190 } 2191 2192 static void addrconf_dev_config(struct net_device *dev) 2193 { 2194 struct in6_addr addr; 2195 struct inet6_dev * idev; 2196 2197 ASSERT_RTNL(); 2198 2199 if ((dev->type != ARPHRD_ETHER) && 2200 (dev->type != ARPHRD_FDDI) && 2201 (dev->type != ARPHRD_IEEE802_TR) && 2202 (dev->type != ARPHRD_ARCNET) && 2203 (dev->type != ARPHRD_INFINIBAND)) { 2204 /* Alas, we support only Ethernet autoconfiguration. */ 2205 return; 2206 } 2207 2208 idev = addrconf_add_dev(dev); 2209 if (idev == NULL) 2210 return; 2211 2212 memset(&addr, 0, sizeof(struct in6_addr)); 2213 addr.s6_addr32[0] = htonl(0xFE800000); 2214 2215 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2216 addrconf_add_linklocal(idev, &addr); 2217 } 2218 2219 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2220 static void addrconf_sit_config(struct net_device *dev) 2221 { 2222 struct inet6_dev *idev; 2223 2224 ASSERT_RTNL(); 2225 2226 /* 2227 * Configure the tunnel with one of our IPv4 2228 * addresses... we should configure all of 2229 * our v4 addrs in the tunnel 2230 */ 2231 2232 if ((idev = ipv6_find_idev(dev)) == NULL) { 2233 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2234 return; 2235 } 2236 2237 if (dev->priv_flags & IFF_ISATAP) { 2238 struct in6_addr addr; 2239 2240 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2241 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2242 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2243 addrconf_add_linklocal(idev, &addr); 2244 return; 2245 } 2246 2247 sit_add_v4_addrs(idev); 2248 2249 if (dev->flags&IFF_POINTOPOINT) { 2250 addrconf_add_mroute(dev); 2251 addrconf_add_lroute(dev); 2252 } else 2253 sit_route_add(dev); 2254 } 2255 #endif 2256 2257 static inline int 2258 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2259 { 2260 struct in6_addr lladdr; 2261 2262 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2263 addrconf_add_linklocal(idev, &lladdr); 2264 return 0; 2265 } 2266 return -1; 2267 } 2268 2269 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2270 { 2271 struct net_device *link_dev; 2272 2273 /* first try to inherit the link-local address from the link device */ 2274 if (idev->dev->iflink && 2275 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) { 2276 if (!ipv6_inherit_linklocal(idev, link_dev)) 2277 return; 2278 } 2279 /* then try to inherit it from any device */ 2280 for_each_netdev(&init_net, link_dev) { 2281 if (!ipv6_inherit_linklocal(idev, link_dev)) 2282 return; 2283 } 2284 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2285 } 2286 2287 /* 2288 * Autoconfigure tunnel with a link-local address so routing protocols, 2289 * DHCPv6, MLD etc. can be run over the virtual link 2290 */ 2291 2292 static void addrconf_ip6_tnl_config(struct net_device *dev) 2293 { 2294 struct inet6_dev *idev; 2295 2296 ASSERT_RTNL(); 2297 2298 if ((idev = addrconf_add_dev(dev)) == NULL) { 2299 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2300 return; 2301 } 2302 ip6_tnl_add_linklocal(idev); 2303 } 2304 2305 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2306 void * data) 2307 { 2308 struct net_device *dev = (struct net_device *) data; 2309 struct inet6_dev *idev = __in6_dev_get(dev); 2310 int run_pending = 0; 2311 int err; 2312 2313 if (dev->nd_net != &init_net) 2314 return NOTIFY_DONE; 2315 2316 switch(event) { 2317 case NETDEV_REGISTER: 2318 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2319 idev = ipv6_add_dev(dev); 2320 if (!idev) 2321 return notifier_from_errno(-ENOMEM); 2322 } 2323 break; 2324 case NETDEV_UP: 2325 case NETDEV_CHANGE: 2326 if (dev->flags & IFF_SLAVE) 2327 break; 2328 2329 if (event == NETDEV_UP) { 2330 if (!addrconf_qdisc_ok(dev)) { 2331 /* device is not ready yet. */ 2332 printk(KERN_INFO 2333 "ADDRCONF(NETDEV_UP): %s: " 2334 "link is not ready\n", 2335 dev->name); 2336 break; 2337 } 2338 2339 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2340 idev = ipv6_add_dev(dev); 2341 2342 if (idev) 2343 idev->if_flags |= IF_READY; 2344 } else { 2345 if (!addrconf_qdisc_ok(dev)) { 2346 /* device is still not ready. */ 2347 break; 2348 } 2349 2350 if (idev) { 2351 if (idev->if_flags & IF_READY) { 2352 /* device is already configured. */ 2353 break; 2354 } 2355 idev->if_flags |= IF_READY; 2356 } 2357 2358 printk(KERN_INFO 2359 "ADDRCONF(NETDEV_CHANGE): %s: " 2360 "link becomes ready\n", 2361 dev->name); 2362 2363 run_pending = 1; 2364 } 2365 2366 switch(dev->type) { 2367 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2368 case ARPHRD_SIT: 2369 addrconf_sit_config(dev); 2370 break; 2371 #endif 2372 case ARPHRD_TUNNEL6: 2373 addrconf_ip6_tnl_config(dev); 2374 break; 2375 case ARPHRD_LOOPBACK: 2376 init_loopback(dev); 2377 break; 2378 2379 default: 2380 addrconf_dev_config(dev); 2381 break; 2382 } 2383 if (idev) { 2384 if (run_pending) 2385 addrconf_dad_run(idev); 2386 2387 /* If the MTU changed during the interface down, when the 2388 interface up, the changed MTU must be reflected in the 2389 idev as well as routers. 2390 */ 2391 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2392 rt6_mtu_change(dev, dev->mtu); 2393 idev->cnf.mtu6 = dev->mtu; 2394 } 2395 idev->tstamp = jiffies; 2396 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2397 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2398 stop IPv6 on this interface. 2399 */ 2400 if (dev->mtu < IPV6_MIN_MTU) 2401 addrconf_ifdown(dev, event != NETDEV_DOWN); 2402 } 2403 break; 2404 2405 case NETDEV_CHANGEMTU: 2406 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2407 rt6_mtu_change(dev, dev->mtu); 2408 idev->cnf.mtu6 = dev->mtu; 2409 break; 2410 } 2411 2412 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2413 idev = ipv6_add_dev(dev); 2414 if (idev) 2415 break; 2416 } 2417 2418 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2419 2420 case NETDEV_DOWN: 2421 case NETDEV_UNREGISTER: 2422 /* 2423 * Remove all addresses from this interface. 2424 */ 2425 addrconf_ifdown(dev, event != NETDEV_DOWN); 2426 break; 2427 2428 case NETDEV_CHANGENAME: 2429 if (idev) { 2430 snmp6_unregister_dev(idev); 2431 addrconf_sysctl_unregister(idev); 2432 addrconf_sysctl_register(idev); 2433 err = snmp6_register_dev(idev); 2434 if (err) 2435 return notifier_from_errno(err); 2436 } 2437 break; 2438 } 2439 2440 return NOTIFY_OK; 2441 } 2442 2443 /* 2444 * addrconf module should be notified of a device going up 2445 */ 2446 static struct notifier_block ipv6_dev_notf = { 2447 .notifier_call = addrconf_notify, 2448 .priority = 0 2449 }; 2450 2451 static int addrconf_ifdown(struct net_device *dev, int how) 2452 { 2453 struct inet6_dev *idev; 2454 struct inet6_ifaddr *ifa, **bifa; 2455 int i; 2456 2457 ASSERT_RTNL(); 2458 2459 if ((dev->flags & IFF_LOOPBACK) && how == 1) 2460 how = 0; 2461 2462 rt6_ifdown(dev); 2463 neigh_ifdown(&nd_tbl, dev); 2464 2465 idev = __in6_dev_get(dev); 2466 if (idev == NULL) 2467 return -ENODEV; 2468 2469 /* Step 1: remove reference to ipv6 device from parent device. 2470 Do not dev_put! 2471 */ 2472 if (how) { 2473 idev->dead = 1; 2474 2475 /* protected by rtnl_lock */ 2476 rcu_assign_pointer(dev->ip6_ptr, NULL); 2477 2478 /* Step 1.5: remove snmp6 entry */ 2479 snmp6_unregister_dev(idev); 2480 2481 } 2482 2483 /* Step 2: clear hash table */ 2484 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2485 bifa = &inet6_addr_lst[i]; 2486 2487 write_lock_bh(&addrconf_hash_lock); 2488 while ((ifa = *bifa) != NULL) { 2489 if (ifa->idev == idev) { 2490 *bifa = ifa->lst_next; 2491 ifa->lst_next = NULL; 2492 addrconf_del_timer(ifa); 2493 in6_ifa_put(ifa); 2494 continue; 2495 } 2496 bifa = &ifa->lst_next; 2497 } 2498 write_unlock_bh(&addrconf_hash_lock); 2499 } 2500 2501 write_lock_bh(&idev->lock); 2502 2503 /* Step 3: clear flags for stateless addrconf */ 2504 if (!how) 2505 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2506 2507 /* Step 4: clear address list */ 2508 #ifdef CONFIG_IPV6_PRIVACY 2509 if (how && del_timer(&idev->regen_timer)) 2510 in6_dev_put(idev); 2511 2512 /* clear tempaddr list */ 2513 while ((ifa = idev->tempaddr_list) != NULL) { 2514 idev->tempaddr_list = ifa->tmp_next; 2515 ifa->tmp_next = NULL; 2516 ifa->dead = 1; 2517 write_unlock_bh(&idev->lock); 2518 spin_lock_bh(&ifa->lock); 2519 2520 if (ifa->ifpub) { 2521 in6_ifa_put(ifa->ifpub); 2522 ifa->ifpub = NULL; 2523 } 2524 spin_unlock_bh(&ifa->lock); 2525 in6_ifa_put(ifa); 2526 write_lock_bh(&idev->lock); 2527 } 2528 #endif 2529 while ((ifa = idev->addr_list) != NULL) { 2530 idev->addr_list = ifa->if_next; 2531 ifa->if_next = NULL; 2532 ifa->dead = 1; 2533 addrconf_del_timer(ifa); 2534 write_unlock_bh(&idev->lock); 2535 2536 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2537 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2538 in6_ifa_put(ifa); 2539 2540 write_lock_bh(&idev->lock); 2541 } 2542 write_unlock_bh(&idev->lock); 2543 2544 /* Step 5: Discard multicast list */ 2545 2546 if (how) 2547 ipv6_mc_destroy_dev(idev); 2548 else 2549 ipv6_mc_down(idev); 2550 2551 idev->tstamp = jiffies; 2552 2553 /* Shot the device (if unregistered) */ 2554 2555 if (how) { 2556 addrconf_sysctl_unregister(idev); 2557 neigh_parms_release(&nd_tbl, idev->nd_parms); 2558 neigh_ifdown(&nd_tbl, dev); 2559 in6_dev_put(idev); 2560 } 2561 return 0; 2562 } 2563 2564 static void addrconf_rs_timer(unsigned long data) 2565 { 2566 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2567 2568 if (ifp->idev->cnf.forwarding) 2569 goto out; 2570 2571 if (ifp->idev->if_flags & IF_RA_RCVD) { 2572 /* 2573 * Announcement received after solicitation 2574 * was sent 2575 */ 2576 goto out; 2577 } 2578 2579 spin_lock(&ifp->lock); 2580 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2581 struct in6_addr all_routers; 2582 2583 /* The wait after the last probe can be shorter */ 2584 addrconf_mod_timer(ifp, AC_RS, 2585 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2586 ifp->idev->cnf.rtr_solicit_delay : 2587 ifp->idev->cnf.rtr_solicit_interval); 2588 spin_unlock(&ifp->lock); 2589 2590 ipv6_addr_all_routers(&all_routers); 2591 2592 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2593 } else { 2594 spin_unlock(&ifp->lock); 2595 /* 2596 * Note: we do not support deprecated "all on-link" 2597 * assumption any longer. 2598 */ 2599 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2600 ifp->idev->dev->name); 2601 } 2602 2603 out: 2604 in6_ifa_put(ifp); 2605 } 2606 2607 /* 2608 * Duplicate Address Detection 2609 */ 2610 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2611 { 2612 unsigned long rand_num; 2613 struct inet6_dev *idev = ifp->idev; 2614 2615 if (ifp->flags & IFA_F_OPTIMISTIC) 2616 rand_num = 0; 2617 else 2618 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2619 2620 ifp->probes = idev->cnf.dad_transmits; 2621 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2622 } 2623 2624 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2625 { 2626 struct inet6_dev *idev = ifp->idev; 2627 struct net_device *dev = idev->dev; 2628 2629 addrconf_join_solict(dev, &ifp->addr); 2630 2631 net_srandom(ifp->addr.s6_addr32[3]); 2632 2633 read_lock_bh(&idev->lock); 2634 if (ifp->dead) 2635 goto out; 2636 spin_lock_bh(&ifp->lock); 2637 2638 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2639 !(ifp->flags&IFA_F_TENTATIVE) || 2640 ifp->flags & IFA_F_NODAD) { 2641 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2642 spin_unlock_bh(&ifp->lock); 2643 read_unlock_bh(&idev->lock); 2644 2645 addrconf_dad_completed(ifp); 2646 return; 2647 } 2648 2649 if (!(idev->if_flags & IF_READY)) { 2650 spin_unlock_bh(&ifp->lock); 2651 read_unlock_bh(&idev->lock); 2652 /* 2653 * If the defice is not ready: 2654 * - keep it tentative if it is a permanent address. 2655 * - otherwise, kill it. 2656 */ 2657 in6_ifa_hold(ifp); 2658 addrconf_dad_stop(ifp); 2659 return; 2660 } 2661 2662 /* 2663 * Optimistic nodes can start receiving 2664 * Frames right away 2665 */ 2666 if(ifp->flags & IFA_F_OPTIMISTIC) 2667 ip6_ins_rt(ifp->rt); 2668 2669 addrconf_dad_kick(ifp); 2670 spin_unlock_bh(&ifp->lock); 2671 out: 2672 read_unlock_bh(&idev->lock); 2673 } 2674 2675 static void addrconf_dad_timer(unsigned long data) 2676 { 2677 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2678 struct inet6_dev *idev = ifp->idev; 2679 struct in6_addr unspec; 2680 struct in6_addr mcaddr; 2681 2682 read_lock_bh(&idev->lock); 2683 if (idev->dead) { 2684 read_unlock_bh(&idev->lock); 2685 goto out; 2686 } 2687 spin_lock_bh(&ifp->lock); 2688 if (ifp->probes == 0) { 2689 /* 2690 * DAD was successful 2691 */ 2692 2693 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC); 2694 spin_unlock_bh(&ifp->lock); 2695 read_unlock_bh(&idev->lock); 2696 2697 addrconf_dad_completed(ifp); 2698 2699 goto out; 2700 } 2701 2702 ifp->probes--; 2703 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2704 spin_unlock_bh(&ifp->lock); 2705 read_unlock_bh(&idev->lock); 2706 2707 /* send a neighbour solicitation for our addr */ 2708 memset(&unspec, 0, sizeof(unspec)); 2709 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2710 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2711 out: 2712 in6_ifa_put(ifp); 2713 } 2714 2715 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2716 { 2717 struct net_device * dev = ifp->idev->dev; 2718 2719 /* 2720 * Configure the address for reception. Now it is valid. 2721 */ 2722 2723 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2724 2725 /* If added prefix is link local and forwarding is off, 2726 start sending router solicitations. 2727 */ 2728 2729 if (ifp->idev->cnf.forwarding == 0 && 2730 ifp->idev->cnf.rtr_solicits > 0 && 2731 (dev->flags&IFF_LOOPBACK) == 0 && 2732 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2733 struct in6_addr all_routers; 2734 2735 ipv6_addr_all_routers(&all_routers); 2736 2737 /* 2738 * If a host as already performed a random delay 2739 * [...] as part of DAD [...] there is no need 2740 * to delay again before sending the first RS 2741 */ 2742 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2743 2744 spin_lock_bh(&ifp->lock); 2745 ifp->probes = 1; 2746 ifp->idev->if_flags |= IF_RS_SENT; 2747 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2748 spin_unlock_bh(&ifp->lock); 2749 } 2750 } 2751 2752 static void addrconf_dad_run(struct inet6_dev *idev) { 2753 struct inet6_ifaddr *ifp; 2754 2755 read_lock_bh(&idev->lock); 2756 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2757 spin_lock_bh(&ifp->lock); 2758 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2759 spin_unlock_bh(&ifp->lock); 2760 continue; 2761 } 2762 spin_unlock_bh(&ifp->lock); 2763 addrconf_dad_kick(ifp); 2764 } 2765 read_unlock_bh(&idev->lock); 2766 } 2767 2768 #ifdef CONFIG_PROC_FS 2769 struct if6_iter_state { 2770 struct seq_net_private p; 2771 int bucket; 2772 }; 2773 2774 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2775 { 2776 struct inet6_ifaddr *ifa = NULL; 2777 struct if6_iter_state *state = seq->private; 2778 struct net *net = state->p.net; 2779 2780 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2781 ifa = inet6_addr_lst[state->bucket]; 2782 2783 while (ifa && ifa->idev->dev->nd_net != net) 2784 ifa = ifa->lst_next; 2785 if (ifa) 2786 break; 2787 } 2788 return ifa; 2789 } 2790 2791 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2792 { 2793 struct if6_iter_state *state = seq->private; 2794 struct net *net = state->p.net; 2795 2796 ifa = ifa->lst_next; 2797 try_again: 2798 if (ifa) { 2799 if (ifa->idev->dev->nd_net != net) { 2800 ifa = ifa->lst_next; 2801 goto try_again; 2802 } 2803 } 2804 2805 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2806 ifa = inet6_addr_lst[state->bucket]; 2807 goto try_again; 2808 } 2809 2810 return ifa; 2811 } 2812 2813 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2814 { 2815 struct inet6_ifaddr *ifa = if6_get_first(seq); 2816 2817 if (ifa) 2818 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2819 --pos; 2820 return pos ? NULL : ifa; 2821 } 2822 2823 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2824 __acquires(addrconf_hash_lock) 2825 { 2826 read_lock_bh(&addrconf_hash_lock); 2827 return if6_get_idx(seq, *pos); 2828 } 2829 2830 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2831 { 2832 struct inet6_ifaddr *ifa; 2833 2834 ifa = if6_get_next(seq, v); 2835 ++*pos; 2836 return ifa; 2837 } 2838 2839 static void if6_seq_stop(struct seq_file *seq, void *v) 2840 __releases(addrconf_hash_lock) 2841 { 2842 read_unlock_bh(&addrconf_hash_lock); 2843 } 2844 2845 static int if6_seq_show(struct seq_file *seq, void *v) 2846 { 2847 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2848 seq_printf(seq, 2849 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2850 NIP6(ifp->addr), 2851 ifp->idev->dev->ifindex, 2852 ifp->prefix_len, 2853 ifp->scope, 2854 ifp->flags, 2855 ifp->idev->dev->name); 2856 return 0; 2857 } 2858 2859 static const struct seq_operations if6_seq_ops = { 2860 .start = if6_seq_start, 2861 .next = if6_seq_next, 2862 .show = if6_seq_show, 2863 .stop = if6_seq_stop, 2864 }; 2865 2866 static int if6_seq_open(struct inode *inode, struct file *file) 2867 { 2868 return seq_open_net(inode, file, &if6_seq_ops, 2869 sizeof(struct if6_iter_state)); 2870 } 2871 2872 static const struct file_operations if6_fops = { 2873 .owner = THIS_MODULE, 2874 .open = if6_seq_open, 2875 .read = seq_read, 2876 .llseek = seq_lseek, 2877 .release = seq_release_net, 2878 }; 2879 2880 static int if6_proc_net_init(struct net *net) 2881 { 2882 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 2883 return -ENOMEM; 2884 return 0; 2885 } 2886 2887 static void if6_proc_net_exit(struct net *net) 2888 { 2889 proc_net_remove(net, "if_inet6"); 2890 } 2891 2892 static struct pernet_operations if6_proc_net_ops = { 2893 .init = if6_proc_net_init, 2894 .exit = if6_proc_net_exit, 2895 }; 2896 2897 int __init if6_proc_init(void) 2898 { 2899 return register_pernet_subsys(&if6_proc_net_ops); 2900 } 2901 2902 void if6_proc_exit(void) 2903 { 2904 unregister_pernet_subsys(&if6_proc_net_ops); 2905 } 2906 #endif /* CONFIG_PROC_FS */ 2907 2908 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 2909 /* Check if address is a home address configured on any interface. */ 2910 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr) 2911 { 2912 int ret = 0; 2913 struct inet6_ifaddr * ifp; 2914 u8 hash = ipv6_addr_hash(addr); 2915 read_lock_bh(&addrconf_hash_lock); 2916 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2917 if (ifp->idev->dev->nd_net != net) 2918 continue; 2919 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 && 2920 (ifp->flags & IFA_F_HOMEADDRESS)) { 2921 ret = 1; 2922 break; 2923 } 2924 } 2925 read_unlock_bh(&addrconf_hash_lock); 2926 return ret; 2927 } 2928 #endif 2929 2930 /* 2931 * Periodic address status verification 2932 */ 2933 2934 static void addrconf_verify(unsigned long foo) 2935 { 2936 struct inet6_ifaddr *ifp; 2937 unsigned long now, next; 2938 int i; 2939 2940 spin_lock_bh(&addrconf_verify_lock); 2941 now = jiffies; 2942 next = now + ADDR_CHECK_FREQUENCY; 2943 2944 del_timer(&addr_chk_timer); 2945 2946 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2947 2948 restart: 2949 read_lock(&addrconf_hash_lock); 2950 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2951 unsigned long age; 2952 #ifdef CONFIG_IPV6_PRIVACY 2953 unsigned long regen_advance; 2954 #endif 2955 2956 if (ifp->flags & IFA_F_PERMANENT) 2957 continue; 2958 2959 spin_lock(&ifp->lock); 2960 age = (now - ifp->tstamp) / HZ; 2961 2962 #ifdef CONFIG_IPV6_PRIVACY 2963 regen_advance = ifp->idev->cnf.regen_max_retry * 2964 ifp->idev->cnf.dad_transmits * 2965 ifp->idev->nd_parms->retrans_time / HZ; 2966 #endif 2967 2968 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2969 age >= ifp->valid_lft) { 2970 spin_unlock(&ifp->lock); 2971 in6_ifa_hold(ifp); 2972 read_unlock(&addrconf_hash_lock); 2973 ipv6_del_addr(ifp); 2974 goto restart; 2975 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2976 spin_unlock(&ifp->lock); 2977 continue; 2978 } else if (age >= ifp->prefered_lft) { 2979 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2980 int deprecate = 0; 2981 2982 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2983 deprecate = 1; 2984 ifp->flags |= IFA_F_DEPRECATED; 2985 } 2986 2987 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2988 next = ifp->tstamp + ifp->valid_lft * HZ; 2989 2990 spin_unlock(&ifp->lock); 2991 2992 if (deprecate) { 2993 in6_ifa_hold(ifp); 2994 read_unlock(&addrconf_hash_lock); 2995 2996 ipv6_ifa_notify(0, ifp); 2997 in6_ifa_put(ifp); 2998 goto restart; 2999 } 3000 #ifdef CONFIG_IPV6_PRIVACY 3001 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3002 !(ifp->flags&IFA_F_TENTATIVE)) { 3003 if (age >= ifp->prefered_lft - regen_advance) { 3004 struct inet6_ifaddr *ifpub = ifp->ifpub; 3005 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3006 next = ifp->tstamp + ifp->prefered_lft * HZ; 3007 if (!ifp->regen_count && ifpub) { 3008 ifp->regen_count++; 3009 in6_ifa_hold(ifp); 3010 in6_ifa_hold(ifpub); 3011 spin_unlock(&ifp->lock); 3012 read_unlock(&addrconf_hash_lock); 3013 spin_lock(&ifpub->lock); 3014 ifpub->regen_count = 0; 3015 spin_unlock(&ifpub->lock); 3016 ipv6_create_tempaddr(ifpub, ifp); 3017 in6_ifa_put(ifpub); 3018 in6_ifa_put(ifp); 3019 goto restart; 3020 } 3021 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3022 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3023 spin_unlock(&ifp->lock); 3024 #endif 3025 } else { 3026 /* ifp->prefered_lft <= ifp->valid_lft */ 3027 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3028 next = ifp->tstamp + ifp->prefered_lft * HZ; 3029 spin_unlock(&ifp->lock); 3030 } 3031 } 3032 read_unlock(&addrconf_hash_lock); 3033 } 3034 3035 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 3036 add_timer(&addr_chk_timer); 3037 spin_unlock_bh(&addrconf_verify_lock); 3038 } 3039 3040 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3041 { 3042 struct in6_addr *pfx = NULL; 3043 3044 if (addr) 3045 pfx = nla_data(addr); 3046 3047 if (local) { 3048 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3049 pfx = NULL; 3050 else 3051 pfx = nla_data(local); 3052 } 3053 3054 return pfx; 3055 } 3056 3057 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3058 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3059 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3060 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3061 }; 3062 3063 static int 3064 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3065 { 3066 struct net *net = skb->sk->sk_net; 3067 struct ifaddrmsg *ifm; 3068 struct nlattr *tb[IFA_MAX+1]; 3069 struct in6_addr *pfx; 3070 int err; 3071 3072 if (net != &init_net) 3073 return -EINVAL; 3074 3075 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3076 if (err < 0) 3077 return err; 3078 3079 ifm = nlmsg_data(nlh); 3080 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3081 if (pfx == NULL) 3082 return -EINVAL; 3083 3084 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3085 } 3086 3087 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3088 u32 prefered_lft, u32 valid_lft) 3089 { 3090 u32 flags = RTF_EXPIRES; 3091 3092 if (!valid_lft || (prefered_lft > valid_lft)) 3093 return -EINVAL; 3094 3095 if (valid_lft == INFINITY_LIFE_TIME) { 3096 ifa_flags |= IFA_F_PERMANENT; 3097 flags = 0; 3098 } else if (valid_lft >= 0x7FFFFFFF/HZ) 3099 valid_lft = 0x7FFFFFFF/HZ; 3100 3101 if (prefered_lft == 0) 3102 ifa_flags |= IFA_F_DEPRECATED; 3103 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 3104 (prefered_lft != INFINITY_LIFE_TIME)) 3105 prefered_lft = 0x7FFFFFFF/HZ; 3106 3107 spin_lock_bh(&ifp->lock); 3108 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3109 ifp->tstamp = jiffies; 3110 ifp->valid_lft = valid_lft; 3111 ifp->prefered_lft = prefered_lft; 3112 3113 spin_unlock_bh(&ifp->lock); 3114 if (!(ifp->flags&IFA_F_TENTATIVE)) 3115 ipv6_ifa_notify(0, ifp); 3116 3117 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3118 jiffies_to_clock_t(valid_lft * HZ), flags); 3119 addrconf_verify(0); 3120 3121 return 0; 3122 } 3123 3124 static int 3125 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3126 { 3127 struct net *net = skb->sk->sk_net; 3128 struct ifaddrmsg *ifm; 3129 struct nlattr *tb[IFA_MAX+1]; 3130 struct in6_addr *pfx; 3131 struct inet6_ifaddr *ifa; 3132 struct net_device *dev; 3133 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3134 u8 ifa_flags; 3135 int err; 3136 3137 if (net != &init_net) 3138 return -EINVAL; 3139 3140 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3141 if (err < 0) 3142 return err; 3143 3144 ifm = nlmsg_data(nlh); 3145 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3146 if (pfx == NULL) 3147 return -EINVAL; 3148 3149 if (tb[IFA_CACHEINFO]) { 3150 struct ifa_cacheinfo *ci; 3151 3152 ci = nla_data(tb[IFA_CACHEINFO]); 3153 valid_lft = ci->ifa_valid; 3154 preferred_lft = ci->ifa_prefered; 3155 } else { 3156 preferred_lft = INFINITY_LIFE_TIME; 3157 valid_lft = INFINITY_LIFE_TIME; 3158 } 3159 3160 dev = __dev_get_by_index(&init_net, ifm->ifa_index); 3161 if (dev == NULL) 3162 return -ENODEV; 3163 3164 /* We ignore other flags so far. */ 3165 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3166 3167 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3168 if (ifa == NULL) { 3169 /* 3170 * It would be best to check for !NLM_F_CREATE here but 3171 * userspace alreay relies on not having to provide this. 3172 */ 3173 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 3174 ifa_flags, preferred_lft, valid_lft); 3175 } 3176 3177 if (nlh->nlmsg_flags & NLM_F_EXCL || 3178 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3179 err = -EEXIST; 3180 else 3181 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3182 3183 in6_ifa_put(ifa); 3184 3185 return err; 3186 } 3187 3188 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3189 u8 scope, int ifindex) 3190 { 3191 struct ifaddrmsg *ifm; 3192 3193 ifm = nlmsg_data(nlh); 3194 ifm->ifa_family = AF_INET6; 3195 ifm->ifa_prefixlen = prefixlen; 3196 ifm->ifa_flags = flags; 3197 ifm->ifa_scope = scope; 3198 ifm->ifa_index = ifindex; 3199 } 3200 3201 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3202 unsigned long tstamp, u32 preferred, u32 valid) 3203 { 3204 struct ifa_cacheinfo ci; 3205 3206 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3207 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3208 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3209 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3210 ci.ifa_prefered = preferred; 3211 ci.ifa_valid = valid; 3212 3213 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3214 } 3215 3216 static inline int rt_scope(int ifa_scope) 3217 { 3218 if (ifa_scope & IFA_HOST) 3219 return RT_SCOPE_HOST; 3220 else if (ifa_scope & IFA_LINK) 3221 return RT_SCOPE_LINK; 3222 else if (ifa_scope & IFA_SITE) 3223 return RT_SCOPE_SITE; 3224 else 3225 return RT_SCOPE_UNIVERSE; 3226 } 3227 3228 static inline int inet6_ifaddr_msgsize(void) 3229 { 3230 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3231 + nla_total_size(16) /* IFA_ADDRESS */ 3232 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3233 } 3234 3235 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3236 u32 pid, u32 seq, int event, unsigned int flags) 3237 { 3238 struct nlmsghdr *nlh; 3239 u32 preferred, valid; 3240 3241 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3242 if (nlh == NULL) 3243 return -EMSGSIZE; 3244 3245 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3246 ifa->idev->dev->ifindex); 3247 3248 if (!(ifa->flags&IFA_F_PERMANENT)) { 3249 preferred = ifa->prefered_lft; 3250 valid = ifa->valid_lft; 3251 if (preferred != INFINITY_LIFE_TIME) { 3252 long tval = (jiffies - ifa->tstamp)/HZ; 3253 preferred -= tval; 3254 if (valid != INFINITY_LIFE_TIME) 3255 valid -= tval; 3256 } 3257 } else { 3258 preferred = INFINITY_LIFE_TIME; 3259 valid = INFINITY_LIFE_TIME; 3260 } 3261 3262 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3263 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3264 nlmsg_cancel(skb, nlh); 3265 return -EMSGSIZE; 3266 } 3267 3268 return nlmsg_end(skb, nlh); 3269 } 3270 3271 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3272 u32 pid, u32 seq, int event, u16 flags) 3273 { 3274 struct nlmsghdr *nlh; 3275 u8 scope = RT_SCOPE_UNIVERSE; 3276 int ifindex = ifmca->idev->dev->ifindex; 3277 3278 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3279 scope = RT_SCOPE_SITE; 3280 3281 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3282 if (nlh == NULL) 3283 return -EMSGSIZE; 3284 3285 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3286 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3287 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3288 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3289 nlmsg_cancel(skb, nlh); 3290 return -EMSGSIZE; 3291 } 3292 3293 return nlmsg_end(skb, nlh); 3294 } 3295 3296 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3297 u32 pid, u32 seq, int event, unsigned int flags) 3298 { 3299 struct nlmsghdr *nlh; 3300 u8 scope = RT_SCOPE_UNIVERSE; 3301 int ifindex = ifaca->aca_idev->dev->ifindex; 3302 3303 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3304 scope = RT_SCOPE_SITE; 3305 3306 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3307 if (nlh == NULL) 3308 return -EMSGSIZE; 3309 3310 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3311 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3312 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3313 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3314 nlmsg_cancel(skb, nlh); 3315 return -EMSGSIZE; 3316 } 3317 3318 return nlmsg_end(skb, nlh); 3319 } 3320 3321 enum addr_type_t 3322 { 3323 UNICAST_ADDR, 3324 MULTICAST_ADDR, 3325 ANYCAST_ADDR, 3326 }; 3327 3328 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3329 enum addr_type_t type) 3330 { 3331 int idx, ip_idx; 3332 int s_idx, s_ip_idx; 3333 int err = 1; 3334 struct net_device *dev; 3335 struct inet6_dev *idev = NULL; 3336 struct inet6_ifaddr *ifa; 3337 struct ifmcaddr6 *ifmca; 3338 struct ifacaddr6 *ifaca; 3339 3340 s_idx = cb->args[0]; 3341 s_ip_idx = ip_idx = cb->args[1]; 3342 3343 idx = 0; 3344 for_each_netdev(&init_net, dev) { 3345 if (idx < s_idx) 3346 goto cont; 3347 if (idx > s_idx) 3348 s_ip_idx = 0; 3349 ip_idx = 0; 3350 if ((idev = in6_dev_get(dev)) == NULL) 3351 goto cont; 3352 read_lock_bh(&idev->lock); 3353 switch (type) { 3354 case UNICAST_ADDR: 3355 /* unicast address incl. temp addr */ 3356 for (ifa = idev->addr_list; ifa; 3357 ifa = ifa->if_next, ip_idx++) { 3358 if (ip_idx < s_ip_idx) 3359 continue; 3360 err = inet6_fill_ifaddr(skb, ifa, 3361 NETLINK_CB(cb->skb).pid, 3362 cb->nlh->nlmsg_seq, 3363 RTM_NEWADDR, 3364 NLM_F_MULTI); 3365 } 3366 break; 3367 case MULTICAST_ADDR: 3368 /* multicast address */ 3369 for (ifmca = idev->mc_list; ifmca; 3370 ifmca = ifmca->next, ip_idx++) { 3371 if (ip_idx < s_ip_idx) 3372 continue; 3373 err = inet6_fill_ifmcaddr(skb, ifmca, 3374 NETLINK_CB(cb->skb).pid, 3375 cb->nlh->nlmsg_seq, 3376 RTM_GETMULTICAST, 3377 NLM_F_MULTI); 3378 } 3379 break; 3380 case ANYCAST_ADDR: 3381 /* anycast address */ 3382 for (ifaca = idev->ac_list; ifaca; 3383 ifaca = ifaca->aca_next, ip_idx++) { 3384 if (ip_idx < s_ip_idx) 3385 continue; 3386 err = inet6_fill_ifacaddr(skb, ifaca, 3387 NETLINK_CB(cb->skb).pid, 3388 cb->nlh->nlmsg_seq, 3389 RTM_GETANYCAST, 3390 NLM_F_MULTI); 3391 } 3392 break; 3393 default: 3394 break; 3395 } 3396 read_unlock_bh(&idev->lock); 3397 in6_dev_put(idev); 3398 3399 if (err <= 0) 3400 break; 3401 cont: 3402 idx++; 3403 } 3404 cb->args[0] = idx; 3405 cb->args[1] = ip_idx; 3406 return skb->len; 3407 } 3408 3409 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3410 { 3411 struct net *net = skb->sk->sk_net; 3412 enum addr_type_t type = UNICAST_ADDR; 3413 3414 if (net != &init_net) 3415 return 0; 3416 3417 return inet6_dump_addr(skb, cb, type); 3418 } 3419 3420 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3421 { 3422 struct net *net = skb->sk->sk_net; 3423 enum addr_type_t type = MULTICAST_ADDR; 3424 3425 if (net != &init_net) 3426 return 0; 3427 3428 return inet6_dump_addr(skb, cb, type); 3429 } 3430 3431 3432 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3433 { 3434 struct net *net = skb->sk->sk_net; 3435 enum addr_type_t type = ANYCAST_ADDR; 3436 3437 if (net != &init_net) 3438 return 0; 3439 3440 return inet6_dump_addr(skb, cb, type); 3441 } 3442 3443 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3444 void *arg) 3445 { 3446 struct net *net = in_skb->sk->sk_net; 3447 struct ifaddrmsg *ifm; 3448 struct nlattr *tb[IFA_MAX+1]; 3449 struct in6_addr *addr = NULL; 3450 struct net_device *dev = NULL; 3451 struct inet6_ifaddr *ifa; 3452 struct sk_buff *skb; 3453 int err; 3454 3455 if (net != &init_net) 3456 return -EINVAL; 3457 3458 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3459 if (err < 0) 3460 goto errout; 3461 3462 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3463 if (addr == NULL) { 3464 err = -EINVAL; 3465 goto errout; 3466 } 3467 3468 ifm = nlmsg_data(nlh); 3469 if (ifm->ifa_index) 3470 dev = __dev_get_by_index(&init_net, ifm->ifa_index); 3471 3472 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) { 3473 err = -EADDRNOTAVAIL; 3474 goto errout; 3475 } 3476 3477 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3478 err = -ENOBUFS; 3479 goto errout_ifa; 3480 } 3481 3482 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3483 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3484 if (err < 0) { 3485 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3486 WARN_ON(err == -EMSGSIZE); 3487 kfree_skb(skb); 3488 goto errout_ifa; 3489 } 3490 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); 3491 errout_ifa: 3492 in6_ifa_put(ifa); 3493 errout: 3494 return err; 3495 } 3496 3497 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3498 { 3499 struct sk_buff *skb; 3500 int err = -ENOBUFS; 3501 3502 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3503 if (skb == NULL) 3504 goto errout; 3505 3506 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3507 if (err < 0) { 3508 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3509 WARN_ON(err == -EMSGSIZE); 3510 kfree_skb(skb); 3511 goto errout; 3512 } 3513 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3514 errout: 3515 if (err < 0) 3516 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err); 3517 } 3518 3519 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3520 __s32 *array, int bytes) 3521 { 3522 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3523 3524 memset(array, 0, bytes); 3525 array[DEVCONF_FORWARDING] = cnf->forwarding; 3526 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3527 array[DEVCONF_MTU6] = cnf->mtu6; 3528 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3529 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3530 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3531 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3532 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3533 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3534 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3535 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3536 #ifdef CONFIG_IPV6_PRIVACY 3537 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3538 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3539 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3540 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3541 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3542 #endif 3543 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3544 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3545 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3546 #ifdef CONFIG_IPV6_ROUTER_PREF 3547 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3548 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3549 #ifdef CONFIG_IPV6_ROUTE_INFO 3550 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3551 #endif 3552 #endif 3553 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3554 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3555 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3556 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3557 #endif 3558 } 3559 3560 static inline size_t inet6_if_nlmsg_size(void) 3561 { 3562 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3563 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3564 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3565 + nla_total_size(4) /* IFLA_MTU */ 3566 + nla_total_size(4) /* IFLA_LINK */ 3567 + nla_total_size( /* IFLA_PROTINFO */ 3568 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3569 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3570 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3571 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3572 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 3573 ); 3574 } 3575 3576 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items, 3577 int bytes) 3578 { 3579 int i; 3580 int pad = bytes - sizeof(u64) * items; 3581 BUG_ON(pad < 0); 3582 3583 /* Use put_unaligned() because stats may not be aligned for u64. */ 3584 put_unaligned(items, &stats[0]); 3585 for (i = 1; i < items; i++) 3586 put_unaligned(snmp_fold_field(mib, i), &stats[i]); 3587 3588 memset(&stats[items], 0, pad); 3589 } 3590 3591 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3592 int bytes) 3593 { 3594 switch(attrtype) { 3595 case IFLA_INET6_STATS: 3596 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes); 3597 break; 3598 case IFLA_INET6_ICMP6STATS: 3599 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes); 3600 break; 3601 } 3602 } 3603 3604 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3605 u32 pid, u32 seq, int event, unsigned int flags) 3606 { 3607 struct net_device *dev = idev->dev; 3608 struct nlattr *nla; 3609 struct ifinfomsg *hdr; 3610 struct nlmsghdr *nlh; 3611 void *protoinfo; 3612 struct ifla_cacheinfo ci; 3613 3614 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3615 if (nlh == NULL) 3616 return -EMSGSIZE; 3617 3618 hdr = nlmsg_data(nlh); 3619 hdr->ifi_family = AF_INET6; 3620 hdr->__ifi_pad = 0; 3621 hdr->ifi_type = dev->type; 3622 hdr->ifi_index = dev->ifindex; 3623 hdr->ifi_flags = dev_get_flags(dev); 3624 hdr->ifi_change = 0; 3625 3626 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3627 3628 if (dev->addr_len) 3629 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3630 3631 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3632 if (dev->ifindex != dev->iflink) 3633 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3634 3635 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3636 if (protoinfo == NULL) 3637 goto nla_put_failure; 3638 3639 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3640 3641 ci.max_reasm_len = IPV6_MAXPLEN; 3642 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3643 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3644 ci.reachable_time = idev->nd_parms->reachable_time; 3645 ci.retrans_time = idev->nd_parms->retrans_time; 3646 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3647 3648 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3649 if (nla == NULL) 3650 goto nla_put_failure; 3651 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3652 3653 /* XXX - MC not implemented */ 3654 3655 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 3656 if (nla == NULL) 3657 goto nla_put_failure; 3658 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 3659 3660 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 3661 if (nla == NULL) 3662 goto nla_put_failure; 3663 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 3664 3665 nla_nest_end(skb, protoinfo); 3666 return nlmsg_end(skb, nlh); 3667 3668 nla_put_failure: 3669 nlmsg_cancel(skb, nlh); 3670 return -EMSGSIZE; 3671 } 3672 3673 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3674 { 3675 struct net *net = skb->sk->sk_net; 3676 int idx, err; 3677 int s_idx = cb->args[0]; 3678 struct net_device *dev; 3679 struct inet6_dev *idev; 3680 3681 if (net != &init_net) 3682 return 0; 3683 3684 read_lock(&dev_base_lock); 3685 idx = 0; 3686 for_each_netdev(&init_net, dev) { 3687 if (idx < s_idx) 3688 goto cont; 3689 if ((idev = in6_dev_get(dev)) == NULL) 3690 goto cont; 3691 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3692 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3693 in6_dev_put(idev); 3694 if (err <= 0) 3695 break; 3696 cont: 3697 idx++; 3698 } 3699 read_unlock(&dev_base_lock); 3700 cb->args[0] = idx; 3701 3702 return skb->len; 3703 } 3704 3705 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3706 { 3707 struct sk_buff *skb; 3708 int err = -ENOBUFS; 3709 3710 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3711 if (skb == NULL) 3712 goto errout; 3713 3714 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3715 if (err < 0) { 3716 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3717 WARN_ON(err == -EMSGSIZE); 3718 kfree_skb(skb); 3719 goto errout; 3720 } 3721 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3722 errout: 3723 if (err < 0) 3724 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err); 3725 } 3726 3727 static inline size_t inet6_prefix_nlmsg_size(void) 3728 { 3729 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3730 + nla_total_size(sizeof(struct in6_addr)) 3731 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3732 } 3733 3734 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3735 struct prefix_info *pinfo, u32 pid, u32 seq, 3736 int event, unsigned int flags) 3737 { 3738 struct prefixmsg *pmsg; 3739 struct nlmsghdr *nlh; 3740 struct prefix_cacheinfo ci; 3741 3742 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3743 if (nlh == NULL) 3744 return -EMSGSIZE; 3745 3746 pmsg = nlmsg_data(nlh); 3747 pmsg->prefix_family = AF_INET6; 3748 pmsg->prefix_pad1 = 0; 3749 pmsg->prefix_pad2 = 0; 3750 pmsg->prefix_ifindex = idev->dev->ifindex; 3751 pmsg->prefix_len = pinfo->prefix_len; 3752 pmsg->prefix_type = pinfo->type; 3753 pmsg->prefix_pad3 = 0; 3754 pmsg->prefix_flags = 0; 3755 if (pinfo->onlink) 3756 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3757 if (pinfo->autoconf) 3758 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3759 3760 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3761 3762 ci.preferred_time = ntohl(pinfo->prefered); 3763 ci.valid_time = ntohl(pinfo->valid); 3764 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3765 3766 return nlmsg_end(skb, nlh); 3767 3768 nla_put_failure: 3769 nlmsg_cancel(skb, nlh); 3770 return -EMSGSIZE; 3771 } 3772 3773 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3774 struct prefix_info *pinfo) 3775 { 3776 struct sk_buff *skb; 3777 int err = -ENOBUFS; 3778 3779 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3780 if (skb == NULL) 3781 goto errout; 3782 3783 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3784 if (err < 0) { 3785 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3786 WARN_ON(err == -EMSGSIZE); 3787 kfree_skb(skb); 3788 goto errout; 3789 } 3790 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3791 errout: 3792 if (err < 0) 3793 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err); 3794 } 3795 3796 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3797 { 3798 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3799 3800 switch (event) { 3801 case RTM_NEWADDR: 3802 /* 3803 * If the address was optimistic 3804 * we inserted the route at the start of 3805 * our DAD process, so we don't need 3806 * to do it again 3807 */ 3808 if (!(ifp->rt->rt6i_node)) 3809 ip6_ins_rt(ifp->rt); 3810 if (ifp->idev->cnf.forwarding) 3811 addrconf_join_anycast(ifp); 3812 break; 3813 case RTM_DELADDR: 3814 if (ifp->idev->cnf.forwarding) 3815 addrconf_leave_anycast(ifp); 3816 addrconf_leave_solict(ifp->idev, &ifp->addr); 3817 dst_hold(&ifp->rt->u.dst); 3818 if (ip6_del_rt(ifp->rt)) 3819 dst_free(&ifp->rt->u.dst); 3820 break; 3821 } 3822 } 3823 3824 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3825 { 3826 rcu_read_lock_bh(); 3827 if (likely(ifp->idev->dead == 0)) 3828 __ipv6_ifa_notify(event, ifp); 3829 rcu_read_unlock_bh(); 3830 } 3831 3832 #ifdef CONFIG_SYSCTL 3833 3834 static 3835 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3836 void __user *buffer, size_t *lenp, loff_t *ppos) 3837 { 3838 int *valp = ctl->data; 3839 int val = *valp; 3840 int ret; 3841 3842 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3843 3844 if (write) 3845 addrconf_fixup_forwarding(ctl, valp, val); 3846 return ret; 3847 } 3848 3849 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3850 int __user *name, int nlen, 3851 void __user *oldval, 3852 size_t __user *oldlenp, 3853 void __user *newval, size_t newlen) 3854 { 3855 int *valp = table->data; 3856 int val = *valp; 3857 int new; 3858 3859 if (!newval || !newlen) 3860 return 0; 3861 if (newlen != sizeof(int)) 3862 return -EINVAL; 3863 if (get_user(new, (int __user *)newval)) 3864 return -EFAULT; 3865 if (new == *valp) 3866 return 0; 3867 if (oldval && oldlenp) { 3868 size_t len; 3869 if (get_user(len, oldlenp)) 3870 return -EFAULT; 3871 if (len) { 3872 if (len > table->maxlen) 3873 len = table->maxlen; 3874 if (copy_to_user(oldval, valp, len)) 3875 return -EFAULT; 3876 if (put_user(len, oldlenp)) 3877 return -EFAULT; 3878 } 3879 } 3880 3881 *valp = new; 3882 addrconf_fixup_forwarding(table, valp, val); 3883 return 1; 3884 } 3885 3886 static struct addrconf_sysctl_table 3887 { 3888 struct ctl_table_header *sysctl_header; 3889 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3890 char *dev_name; 3891 } addrconf_sysctl __read_mostly = { 3892 .sysctl_header = NULL, 3893 .addrconf_vars = { 3894 { 3895 .ctl_name = NET_IPV6_FORWARDING, 3896 .procname = "forwarding", 3897 .data = &ipv6_devconf.forwarding, 3898 .maxlen = sizeof(int), 3899 .mode = 0644, 3900 .proc_handler = &addrconf_sysctl_forward, 3901 .strategy = &addrconf_sysctl_forward_strategy, 3902 }, 3903 { 3904 .ctl_name = NET_IPV6_HOP_LIMIT, 3905 .procname = "hop_limit", 3906 .data = &ipv6_devconf.hop_limit, 3907 .maxlen = sizeof(int), 3908 .mode = 0644, 3909 .proc_handler = proc_dointvec, 3910 }, 3911 { 3912 .ctl_name = NET_IPV6_MTU, 3913 .procname = "mtu", 3914 .data = &ipv6_devconf.mtu6, 3915 .maxlen = sizeof(int), 3916 .mode = 0644, 3917 .proc_handler = &proc_dointvec, 3918 }, 3919 { 3920 .ctl_name = NET_IPV6_ACCEPT_RA, 3921 .procname = "accept_ra", 3922 .data = &ipv6_devconf.accept_ra, 3923 .maxlen = sizeof(int), 3924 .mode = 0644, 3925 .proc_handler = &proc_dointvec, 3926 }, 3927 { 3928 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3929 .procname = "accept_redirects", 3930 .data = &ipv6_devconf.accept_redirects, 3931 .maxlen = sizeof(int), 3932 .mode = 0644, 3933 .proc_handler = &proc_dointvec, 3934 }, 3935 { 3936 .ctl_name = NET_IPV6_AUTOCONF, 3937 .procname = "autoconf", 3938 .data = &ipv6_devconf.autoconf, 3939 .maxlen = sizeof(int), 3940 .mode = 0644, 3941 .proc_handler = &proc_dointvec, 3942 }, 3943 { 3944 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3945 .procname = "dad_transmits", 3946 .data = &ipv6_devconf.dad_transmits, 3947 .maxlen = sizeof(int), 3948 .mode = 0644, 3949 .proc_handler = &proc_dointvec, 3950 }, 3951 { 3952 .ctl_name = NET_IPV6_RTR_SOLICITS, 3953 .procname = "router_solicitations", 3954 .data = &ipv6_devconf.rtr_solicits, 3955 .maxlen = sizeof(int), 3956 .mode = 0644, 3957 .proc_handler = &proc_dointvec, 3958 }, 3959 { 3960 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3961 .procname = "router_solicitation_interval", 3962 .data = &ipv6_devconf.rtr_solicit_interval, 3963 .maxlen = sizeof(int), 3964 .mode = 0644, 3965 .proc_handler = &proc_dointvec_jiffies, 3966 .strategy = &sysctl_jiffies, 3967 }, 3968 { 3969 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3970 .procname = "router_solicitation_delay", 3971 .data = &ipv6_devconf.rtr_solicit_delay, 3972 .maxlen = sizeof(int), 3973 .mode = 0644, 3974 .proc_handler = &proc_dointvec_jiffies, 3975 .strategy = &sysctl_jiffies, 3976 }, 3977 { 3978 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3979 .procname = "force_mld_version", 3980 .data = &ipv6_devconf.force_mld_version, 3981 .maxlen = sizeof(int), 3982 .mode = 0644, 3983 .proc_handler = &proc_dointvec, 3984 }, 3985 #ifdef CONFIG_IPV6_PRIVACY 3986 { 3987 .ctl_name = NET_IPV6_USE_TEMPADDR, 3988 .procname = "use_tempaddr", 3989 .data = &ipv6_devconf.use_tempaddr, 3990 .maxlen = sizeof(int), 3991 .mode = 0644, 3992 .proc_handler = &proc_dointvec, 3993 }, 3994 { 3995 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3996 .procname = "temp_valid_lft", 3997 .data = &ipv6_devconf.temp_valid_lft, 3998 .maxlen = sizeof(int), 3999 .mode = 0644, 4000 .proc_handler = &proc_dointvec, 4001 }, 4002 { 4003 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 4004 .procname = "temp_prefered_lft", 4005 .data = &ipv6_devconf.temp_prefered_lft, 4006 .maxlen = sizeof(int), 4007 .mode = 0644, 4008 .proc_handler = &proc_dointvec, 4009 }, 4010 { 4011 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 4012 .procname = "regen_max_retry", 4013 .data = &ipv6_devconf.regen_max_retry, 4014 .maxlen = sizeof(int), 4015 .mode = 0644, 4016 .proc_handler = &proc_dointvec, 4017 }, 4018 { 4019 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 4020 .procname = "max_desync_factor", 4021 .data = &ipv6_devconf.max_desync_factor, 4022 .maxlen = sizeof(int), 4023 .mode = 0644, 4024 .proc_handler = &proc_dointvec, 4025 }, 4026 #endif 4027 { 4028 .ctl_name = NET_IPV6_MAX_ADDRESSES, 4029 .procname = "max_addresses", 4030 .data = &ipv6_devconf.max_addresses, 4031 .maxlen = sizeof(int), 4032 .mode = 0644, 4033 .proc_handler = &proc_dointvec, 4034 }, 4035 { 4036 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 4037 .procname = "accept_ra_defrtr", 4038 .data = &ipv6_devconf.accept_ra_defrtr, 4039 .maxlen = sizeof(int), 4040 .mode = 0644, 4041 .proc_handler = &proc_dointvec, 4042 }, 4043 { 4044 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 4045 .procname = "accept_ra_pinfo", 4046 .data = &ipv6_devconf.accept_ra_pinfo, 4047 .maxlen = sizeof(int), 4048 .mode = 0644, 4049 .proc_handler = &proc_dointvec, 4050 }, 4051 #ifdef CONFIG_IPV6_ROUTER_PREF 4052 { 4053 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 4054 .procname = "accept_ra_rtr_pref", 4055 .data = &ipv6_devconf.accept_ra_rtr_pref, 4056 .maxlen = sizeof(int), 4057 .mode = 0644, 4058 .proc_handler = &proc_dointvec, 4059 }, 4060 { 4061 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 4062 .procname = "router_probe_interval", 4063 .data = &ipv6_devconf.rtr_probe_interval, 4064 .maxlen = sizeof(int), 4065 .mode = 0644, 4066 .proc_handler = &proc_dointvec_jiffies, 4067 .strategy = &sysctl_jiffies, 4068 }, 4069 #ifdef CONFIG_IPV6_ROUTE_INFO 4070 { 4071 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 4072 .procname = "accept_ra_rt_info_max_plen", 4073 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4074 .maxlen = sizeof(int), 4075 .mode = 0644, 4076 .proc_handler = &proc_dointvec, 4077 }, 4078 #endif 4079 #endif 4080 { 4081 .ctl_name = NET_IPV6_PROXY_NDP, 4082 .procname = "proxy_ndp", 4083 .data = &ipv6_devconf.proxy_ndp, 4084 .maxlen = sizeof(int), 4085 .mode = 0644, 4086 .proc_handler = &proc_dointvec, 4087 }, 4088 { 4089 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE, 4090 .procname = "accept_source_route", 4091 .data = &ipv6_devconf.accept_source_route, 4092 .maxlen = sizeof(int), 4093 .mode = 0644, 4094 .proc_handler = &proc_dointvec, 4095 }, 4096 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4097 { 4098 .ctl_name = CTL_UNNUMBERED, 4099 .procname = "optimistic_dad", 4100 .data = &ipv6_devconf.optimistic_dad, 4101 .maxlen = sizeof(int), 4102 .mode = 0644, 4103 .proc_handler = &proc_dointvec, 4104 4105 }, 4106 #endif 4107 { 4108 .ctl_name = 0, /* sentinel */ 4109 } 4110 }, 4111 }; 4112 4113 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4114 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p) 4115 { 4116 int i; 4117 struct addrconf_sysctl_table *t; 4118 4119 #define ADDRCONF_CTL_PATH_DEV 3 4120 4121 struct ctl_path addrconf_ctl_path[] = { 4122 { .procname = "net", .ctl_name = CTL_NET, }, 4123 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 4124 { .procname = "conf", .ctl_name = NET_IPV6_CONF, }, 4125 { /* to be set */ }, 4126 { }, 4127 }; 4128 4129 4130 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4131 if (t == NULL) 4132 goto out; 4133 4134 for (i=0; t->addrconf_vars[i].data; i++) { 4135 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4136 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4137 t->addrconf_vars[i].extra2 = net; 4138 } 4139 4140 /* 4141 * Make a copy of dev_name, because '.procname' is regarded as const 4142 * by sysctl and we wouldn't want anyone to change it under our feet 4143 * (see SIOCSIFNAME). 4144 */ 4145 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4146 if (!t->dev_name) 4147 goto free; 4148 4149 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4150 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name; 4151 4152 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4153 t->addrconf_vars); 4154 if (t->sysctl_header == NULL) 4155 goto free_procname; 4156 4157 p->sysctl = t; 4158 return 0; 4159 4160 free_procname: 4161 kfree(t->dev_name); 4162 free: 4163 kfree(t); 4164 out: 4165 return -ENOBUFS; 4166 } 4167 4168 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4169 { 4170 struct addrconf_sysctl_table *t; 4171 4172 if (p->sysctl == NULL) 4173 return; 4174 4175 t = p->sysctl; 4176 p->sysctl = NULL; 4177 unregister_sysctl_table(t->sysctl_header); 4178 kfree(t->dev_name); 4179 kfree(t); 4180 } 4181 4182 static void addrconf_sysctl_register(struct inet6_dev *idev) 4183 { 4184 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6, 4185 NET_IPV6_NEIGH, "ipv6", 4186 &ndisc_ifinfo_sysctl_change, 4187 NULL); 4188 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name, 4189 idev->dev->ifindex, idev, &idev->cnf); 4190 } 4191 4192 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4193 { 4194 __addrconf_sysctl_unregister(&idev->cnf); 4195 neigh_sysctl_unregister(idev->nd_parms); 4196 } 4197 4198 4199 #endif 4200 4201 static int addrconf_init_net(struct net *net) 4202 { 4203 int err; 4204 struct ipv6_devconf *all, *dflt; 4205 4206 err = -ENOMEM; 4207 all = &ipv6_devconf; 4208 dflt = &ipv6_devconf_dflt; 4209 4210 if (net != &init_net) { 4211 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4212 if (all == NULL) 4213 goto err_alloc_all; 4214 4215 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4216 if (dflt == NULL) 4217 goto err_alloc_dflt; 4218 } 4219 4220 net->ipv6.devconf_all = all; 4221 net->ipv6.devconf_dflt = dflt; 4222 4223 #ifdef CONFIG_SYSCTL 4224 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL, 4225 NULL, all); 4226 if (err < 0) 4227 goto err_reg_all; 4228 4229 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT, 4230 NULL, dflt); 4231 if (err < 0) 4232 goto err_reg_dflt; 4233 #endif 4234 return 0; 4235 4236 #ifdef CONFIG_SYSCTL 4237 err_reg_dflt: 4238 __addrconf_sysctl_unregister(all); 4239 err_reg_all: 4240 kfree(dflt); 4241 #endif 4242 err_alloc_dflt: 4243 kfree(all); 4244 err_alloc_all: 4245 return err; 4246 } 4247 4248 static void addrconf_exit_net(struct net *net) 4249 { 4250 #ifdef CONFIG_SYSCTL 4251 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4252 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4253 #endif 4254 if (net != &init_net) { 4255 kfree(net->ipv6.devconf_dflt); 4256 kfree(net->ipv6.devconf_all); 4257 } 4258 } 4259 4260 static struct pernet_operations addrconf_ops = { 4261 .init = addrconf_init_net, 4262 .exit = addrconf_exit_net, 4263 }; 4264 4265 /* 4266 * Device notifier 4267 */ 4268 4269 int register_inet6addr_notifier(struct notifier_block *nb) 4270 { 4271 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4272 } 4273 4274 EXPORT_SYMBOL(register_inet6addr_notifier); 4275 4276 int unregister_inet6addr_notifier(struct notifier_block *nb) 4277 { 4278 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4279 } 4280 4281 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4282 4283 /* 4284 * Init / cleanup code 4285 */ 4286 4287 int __init addrconf_init(void) 4288 { 4289 int err; 4290 4291 if ((err = ipv6_addr_label_init()) < 0) { 4292 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n", 4293 err); 4294 return err; 4295 } 4296 4297 register_pernet_subsys(&addrconf_ops); 4298 4299 /* The addrconf netdev notifier requires that loopback_dev 4300 * has it's ipv6 private information allocated and setup 4301 * before it can bring up and give link-local addresses 4302 * to other devices which are up. 4303 * 4304 * Unfortunately, loopback_dev is not necessarily the first 4305 * entry in the global dev_base list of net devices. In fact, 4306 * it is likely to be the very last entry on that list. 4307 * So this causes the notifier registry below to try and 4308 * give link-local addresses to all devices besides loopback_dev 4309 * first, then loopback_dev, which cases all the non-loopback_dev 4310 * devices to fail to get a link-local address. 4311 * 4312 * So, as a temporary fix, allocate the ipv6 structure for 4313 * loopback_dev first by hand. 4314 * Longer term, all of the dependencies ipv6 has upon the loopback 4315 * device and it being up should be removed. 4316 */ 4317 rtnl_lock(); 4318 if (!ipv6_add_dev(init_net.loopback_dev)) 4319 err = -ENOMEM; 4320 rtnl_unlock(); 4321 if (err) 4322 goto errlo; 4323 4324 ip6_null_entry.u.dst.dev = init_net.loopback_dev; 4325 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev); 4326 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 4327 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev; 4328 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev); 4329 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev; 4330 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev); 4331 #endif 4332 4333 register_netdevice_notifier(&ipv6_dev_notf); 4334 4335 addrconf_verify(0); 4336 4337 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo); 4338 if (err < 0) 4339 goto errout; 4340 4341 /* Only the first call to __rtnl_register can fail */ 4342 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL); 4343 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL); 4344 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr); 4345 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr); 4346 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr); 4347 4348 ipv6_addr_label_rtnl_register(); 4349 4350 return 0; 4351 errout: 4352 unregister_netdevice_notifier(&ipv6_dev_notf); 4353 errlo: 4354 unregister_pernet_subsys(&addrconf_ops); 4355 4356 return err; 4357 } 4358 4359 void addrconf_cleanup(void) 4360 { 4361 struct net_device *dev; 4362 struct inet6_ifaddr *ifa; 4363 int i; 4364 4365 unregister_netdevice_notifier(&ipv6_dev_notf); 4366 4367 unregister_pernet_subsys(&addrconf_ops); 4368 4369 rtnl_lock(); 4370 4371 /* 4372 * clean dev list. 4373 */ 4374 4375 for_each_netdev(&init_net, dev) { 4376 if (__in6_dev_get(dev) == NULL) 4377 continue; 4378 addrconf_ifdown(dev, 1); 4379 } 4380 addrconf_ifdown(init_net.loopback_dev, 2); 4381 4382 /* 4383 * Check hash table. 4384 */ 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 4403 rtnl_unlock(); 4404 } 4405