1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 /* 18 * Changes: 19 * 20 * Janos Farkas : delete timer on ifdown 21 * <chexum@bankinf.banki.hu> 22 * Andi Kleen : kill double kfree on module 23 * unload. 24 * Maciej W. Rozycki : FDDI support 25 * sekiya@USAGI : Don't send too many RS 26 * packets. 27 * yoshfuji@USAGI : Fixed interval between DAD 28 * packets. 29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 30 * address validation timer. 31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 32 * support. 33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 34 * address on a same interface. 35 * YOSHIFUJI Hideaki @USAGI : ARCnet support 36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 37 * seq_file. 38 * YOSHIFUJI Hideaki @USAGI : improved source address 39 * selection; consider scope, 40 * status etc. 41 */ 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/socket.h> 46 #include <linux/sockios.h> 47 #include <linux/net.h> 48 #include <linux/in6.h> 49 #include <linux/netdevice.h> 50 #include <linux/if_addr.h> 51 #include <linux/if_arp.h> 52 #include <linux/if_arcnet.h> 53 #include <linux/if_infiniband.h> 54 #include <linux/route.h> 55 #include <linux/inetdevice.h> 56 #include <linux/init.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/sock.h> 66 #include <net/snmp.h> 67 68 #include <net/ipv6.h> 69 #include <net/protocol.h> 70 #include <net/ndisc.h> 71 #include <net/ip6_route.h> 72 #include <net/addrconf.h> 73 #include <net/tcp.h> 74 #include <net/ip.h> 75 #include <net/netlink.h> 76 #include <linux/if_tunnel.h> 77 #include <linux/rtnetlink.h> 78 79 #ifdef CONFIG_IPV6_PRIVACY 80 #include <linux/random.h> 81 #endif 82 83 #include <asm/uaccess.h> 84 85 #include <linux/proc_fs.h> 86 #include <linux/seq_file.h> 87 88 /* Set to 3 to get tracing... */ 89 #define ACONF_DEBUG 2 90 91 #if ACONF_DEBUG >= 3 92 #define ADBG(x) printk x 93 #else 94 #define ADBG(x) 95 #endif 96 97 #define INFINITY_LIFE_TIME 0xFFFFFFFF 98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 99 100 #ifdef CONFIG_SYSCTL 101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p); 102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p); 103 #endif 104 105 #ifdef CONFIG_IPV6_PRIVACY 106 static int __ipv6_regen_rndid(struct inet6_dev *idev); 107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 108 static void ipv6_regen_rndid(unsigned long data); 109 110 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 111 #endif 112 113 static int ipv6_count_addresses(struct inet6_dev *idev); 114 115 /* 116 * Configured unicast address hash table 117 */ 118 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 119 static DEFINE_RWLOCK(addrconf_hash_lock); 120 121 static void addrconf_verify(unsigned long); 122 123 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 124 static DEFINE_SPINLOCK(addrconf_verify_lock); 125 126 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 128 129 static int addrconf_ifdown(struct net_device *dev, int how); 130 131 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 132 static void addrconf_dad_timer(unsigned long data); 133 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 134 static void addrconf_dad_run(struct inet6_dev *idev); 135 static void addrconf_rs_timer(unsigned long data); 136 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 137 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 138 139 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 140 struct prefix_info *pinfo); 141 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); 142 143 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 144 145 struct ipv6_devconf ipv6_devconf __read_mostly = { 146 .forwarding = 0, 147 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 148 .mtu6 = IPV6_MIN_MTU, 149 .accept_ra = 1, 150 .accept_redirects = 1, 151 .autoconf = 1, 152 .force_mld_version = 0, 153 .dad_transmits = 1, 154 .rtr_solicits = MAX_RTR_SOLICITATIONS, 155 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 156 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 157 #ifdef CONFIG_IPV6_PRIVACY 158 .use_tempaddr = 0, 159 .temp_valid_lft = TEMP_VALID_LIFETIME, 160 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 161 .regen_max_retry = REGEN_MAX_RETRY, 162 .max_desync_factor = MAX_DESYNC_FACTOR, 163 #endif 164 .max_addresses = IPV6_MAX_ADDRESSES, 165 .accept_ra_defrtr = 1, 166 .accept_ra_pinfo = 1, 167 #ifdef CONFIG_IPV6_ROUTER_PREF 168 .accept_ra_rtr_pref = 1, 169 .rtr_probe_interval = 60 * HZ, 170 #ifdef CONFIG_IPV6_ROUTE_INFO 171 .accept_ra_rt_info_max_plen = 0, 172 #endif 173 #endif 174 .proxy_ndp = 0, 175 }; 176 177 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 178 .forwarding = 0, 179 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 180 .mtu6 = IPV6_MIN_MTU, 181 .accept_ra = 1, 182 .accept_redirects = 1, 183 .autoconf = 1, 184 .dad_transmits = 1, 185 .rtr_solicits = MAX_RTR_SOLICITATIONS, 186 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 187 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 188 #ifdef CONFIG_IPV6_PRIVACY 189 .use_tempaddr = 0, 190 .temp_valid_lft = TEMP_VALID_LIFETIME, 191 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 192 .regen_max_retry = REGEN_MAX_RETRY, 193 .max_desync_factor = MAX_DESYNC_FACTOR, 194 #endif 195 .max_addresses = IPV6_MAX_ADDRESSES, 196 .accept_ra_defrtr = 1, 197 .accept_ra_pinfo = 1, 198 #ifdef CONFIG_IPV6_ROUTER_PREF 199 .accept_ra_rtr_pref = 1, 200 .rtr_probe_interval = 60 * HZ, 201 #ifdef CONFIG_IPV6_ROUTE_INFO 202 .accept_ra_rt_info_max_plen = 0, 203 #endif 204 #endif 205 .proxy_ndp = 0, 206 }; 207 208 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 209 #if 0 210 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 211 #endif 212 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 213 214 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 215 { 216 if (del_timer(&ifp->timer)) 217 __in6_ifa_put(ifp); 218 } 219 220 enum addrconf_timer_t 221 { 222 AC_NONE, 223 AC_DAD, 224 AC_RS, 225 }; 226 227 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 228 enum addrconf_timer_t what, 229 unsigned long when) 230 { 231 if (!del_timer(&ifp->timer)) 232 in6_ifa_hold(ifp); 233 234 switch (what) { 235 case AC_DAD: 236 ifp->timer.function = addrconf_dad_timer; 237 break; 238 case AC_RS: 239 ifp->timer.function = addrconf_rs_timer; 240 break; 241 default:; 242 } 243 ifp->timer.expires = jiffies + when; 244 add_timer(&ifp->timer); 245 } 246 247 /* Nobody refers to this device, we may destroy it. */ 248 249 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 250 { 251 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 252 kfree(idev); 253 } 254 255 void in6_dev_finish_destroy(struct inet6_dev *idev) 256 { 257 struct net_device *dev = idev->dev; 258 BUG_TRAP(idev->addr_list==NULL); 259 BUG_TRAP(idev->mc_list==NULL); 260 #ifdef NET_REFCNT_DEBUG 261 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 262 #endif 263 dev_put(dev); 264 if (!idev->dead) { 265 printk("Freeing alive inet6 device %p\n", idev); 266 return; 267 } 268 snmp6_free_dev(idev); 269 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 270 } 271 272 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 273 { 274 struct inet6_dev *ndev; 275 struct in6_addr maddr; 276 277 ASSERT_RTNL(); 278 279 if (dev->mtu < IPV6_MIN_MTU) 280 return NULL; 281 282 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 283 284 if (ndev == NULL) 285 return NULL; 286 287 rwlock_init(&ndev->lock); 288 ndev->dev = dev; 289 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf)); 290 ndev->cnf.mtu6 = dev->mtu; 291 ndev->cnf.sysctl = NULL; 292 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 293 if (ndev->nd_parms == NULL) { 294 kfree(ndev); 295 return NULL; 296 } 297 /* We refer to the device */ 298 dev_hold(dev); 299 300 if (snmp6_alloc_dev(ndev) < 0) { 301 ADBG((KERN_WARNING 302 "%s(): cannot allocate memory for statistics; dev=%s.\n", 303 __FUNCTION__, dev->name)); 304 neigh_parms_release(&nd_tbl, ndev->nd_parms); 305 ndev->dead = 1; 306 in6_dev_finish_destroy(ndev); 307 return NULL; 308 } 309 310 if (snmp6_register_dev(ndev) < 0) { 311 ADBG((KERN_WARNING 312 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 313 __FUNCTION__, dev->name)); 314 neigh_parms_release(&nd_tbl, ndev->nd_parms); 315 ndev->dead = 1; 316 in6_dev_finish_destroy(ndev); 317 return NULL; 318 } 319 320 /* One reference from device. We must do this before 321 * we invoke __ipv6_regen_rndid(). 322 */ 323 in6_dev_hold(ndev); 324 325 #ifdef CONFIG_IPV6_PRIVACY 326 init_timer(&ndev->regen_timer); 327 ndev->regen_timer.function = ipv6_regen_rndid; 328 ndev->regen_timer.data = (unsigned long) ndev; 329 if ((dev->flags&IFF_LOOPBACK) || 330 dev->type == ARPHRD_TUNNEL || 331 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 332 dev->type == ARPHRD_SIT || 333 #endif 334 dev->type == ARPHRD_NONE) { 335 printk(KERN_INFO 336 "%s: Disabled Privacy Extensions\n", 337 dev->name); 338 ndev->cnf.use_tempaddr = -1; 339 } else { 340 in6_dev_hold(ndev); 341 ipv6_regen_rndid((unsigned long) ndev); 342 } 343 #endif 344 345 ipv6_mc_init_dev(ndev); 346 ndev->tstamp = jiffies; 347 #ifdef CONFIG_SYSCTL 348 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 349 NET_IPV6_NEIGH, "ipv6", 350 &ndisc_ifinfo_sysctl_change, 351 NULL); 352 addrconf_sysctl_register(ndev, &ndev->cnf); 353 #endif 354 /* protected by rtnl_lock */ 355 rcu_assign_pointer(dev->ip6_ptr, ndev); 356 357 /* Join all-node multicast group */ 358 ipv6_addr_all_nodes(&maddr); 359 ipv6_dev_mc_inc(dev, &maddr); 360 361 return ndev; 362 } 363 364 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 365 { 366 struct inet6_dev *idev; 367 368 ASSERT_RTNL(); 369 370 if ((idev = __in6_dev_get(dev)) == NULL) { 371 if ((idev = ipv6_add_dev(dev)) == NULL) 372 return NULL; 373 } 374 375 if (dev->flags&IFF_UP) 376 ipv6_mc_up(idev); 377 return idev; 378 } 379 380 #ifdef CONFIG_SYSCTL 381 static void dev_forward_change(struct inet6_dev *idev) 382 { 383 struct net_device *dev; 384 struct inet6_ifaddr *ifa; 385 struct in6_addr addr; 386 387 if (!idev) 388 return; 389 dev = idev->dev; 390 if (dev && (dev->flags & IFF_MULTICAST)) { 391 ipv6_addr_all_routers(&addr); 392 393 if (idev->cnf.forwarding) 394 ipv6_dev_mc_inc(dev, &addr); 395 else 396 ipv6_dev_mc_dec(dev, &addr); 397 } 398 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 399 if (ifa->flags&IFA_F_TENTATIVE) 400 continue; 401 if (idev->cnf.forwarding) 402 addrconf_join_anycast(ifa); 403 else 404 addrconf_leave_anycast(ifa); 405 } 406 } 407 408 409 static void addrconf_forward_change(void) 410 { 411 struct net_device *dev; 412 struct inet6_dev *idev; 413 414 read_lock(&dev_base_lock); 415 for (dev=dev_base; dev; dev=dev->next) { 416 rcu_read_lock(); 417 idev = __in6_dev_get(dev); 418 if (idev) { 419 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); 420 idev->cnf.forwarding = ipv6_devconf.forwarding; 421 if (changed) 422 dev_forward_change(idev); 423 } 424 rcu_read_unlock(); 425 } 426 read_unlock(&dev_base_lock); 427 } 428 #endif 429 430 /* Nobody refers to this ifaddr, destroy it */ 431 432 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 433 { 434 BUG_TRAP(ifp->if_next==NULL); 435 BUG_TRAP(ifp->lst_next==NULL); 436 #ifdef NET_REFCNT_DEBUG 437 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 438 #endif 439 440 in6_dev_put(ifp->idev); 441 442 if (del_timer(&ifp->timer)) 443 printk("Timer is still running, when freeing ifa=%p\n", ifp); 444 445 if (!ifp->dead) { 446 printk("Freeing alive inet6 address %p\n", ifp); 447 return; 448 } 449 dst_release(&ifp->rt->u.dst); 450 451 kfree(ifp); 452 } 453 454 static void 455 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 456 { 457 struct inet6_ifaddr *ifa, **ifap; 458 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 459 460 /* 461 * Each device address list is sorted in order of scope - 462 * global before linklocal. 463 */ 464 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 465 ifap = &ifa->if_next) { 466 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 467 break; 468 } 469 470 ifp->if_next = *ifap; 471 *ifap = ifp; 472 } 473 474 /* On success it returns ifp with increased reference count */ 475 476 static struct inet6_ifaddr * 477 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 478 int scope, u32 flags) 479 { 480 struct inet6_ifaddr *ifa = NULL; 481 struct rt6_info *rt; 482 int hash; 483 int err = 0; 484 485 rcu_read_lock_bh(); 486 if (idev->dead) { 487 err = -ENODEV; /*XXX*/ 488 goto out2; 489 } 490 491 write_lock(&addrconf_hash_lock); 492 493 /* Ignore adding duplicate addresses on an interface */ 494 if (ipv6_chk_same_addr(addr, idev->dev)) { 495 ADBG(("ipv6_add_addr: already assigned\n")); 496 err = -EEXIST; 497 goto out; 498 } 499 500 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 501 502 if (ifa == NULL) { 503 ADBG(("ipv6_add_addr: malloc failed\n")); 504 err = -ENOBUFS; 505 goto out; 506 } 507 508 rt = addrconf_dst_alloc(idev, addr, 0); 509 if (IS_ERR(rt)) { 510 err = PTR_ERR(rt); 511 goto out; 512 } 513 514 ipv6_addr_copy(&ifa->addr, addr); 515 516 spin_lock_init(&ifa->lock); 517 init_timer(&ifa->timer); 518 ifa->timer.data = (unsigned long) ifa; 519 ifa->scope = scope; 520 ifa->prefix_len = pfxlen; 521 ifa->flags = flags | IFA_F_TENTATIVE; 522 ifa->cstamp = ifa->tstamp = jiffies; 523 524 ifa->rt = rt; 525 526 ifa->idev = idev; 527 in6_dev_hold(idev); 528 /* For caller */ 529 in6_ifa_hold(ifa); 530 531 /* Add to big hash table */ 532 hash = ipv6_addr_hash(addr); 533 534 ifa->lst_next = inet6_addr_lst[hash]; 535 inet6_addr_lst[hash] = ifa; 536 in6_ifa_hold(ifa); 537 write_unlock(&addrconf_hash_lock); 538 539 write_lock(&idev->lock); 540 /* Add to inet6_dev unicast addr list. */ 541 ipv6_link_dev_addr(idev, ifa); 542 543 #ifdef CONFIG_IPV6_PRIVACY 544 if (ifa->flags&IFA_F_TEMPORARY) { 545 ifa->tmp_next = idev->tempaddr_list; 546 idev->tempaddr_list = ifa; 547 in6_ifa_hold(ifa); 548 } 549 #endif 550 551 in6_ifa_hold(ifa); 552 write_unlock(&idev->lock); 553 out2: 554 rcu_read_unlock_bh(); 555 556 if (likely(err == 0)) 557 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 558 else { 559 kfree(ifa); 560 ifa = ERR_PTR(err); 561 } 562 563 return ifa; 564 out: 565 write_unlock(&addrconf_hash_lock); 566 goto out2; 567 } 568 569 /* This function wants to get referenced ifp and releases it before return */ 570 571 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 572 { 573 struct inet6_ifaddr *ifa, **ifap; 574 struct inet6_dev *idev = ifp->idev; 575 int hash; 576 int deleted = 0, onlink = 0; 577 unsigned long expires = jiffies; 578 579 hash = ipv6_addr_hash(&ifp->addr); 580 581 ifp->dead = 1; 582 583 write_lock_bh(&addrconf_hash_lock); 584 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 585 ifap = &ifa->lst_next) { 586 if (ifa == ifp) { 587 *ifap = ifa->lst_next; 588 __in6_ifa_put(ifp); 589 ifa->lst_next = NULL; 590 break; 591 } 592 } 593 write_unlock_bh(&addrconf_hash_lock); 594 595 write_lock_bh(&idev->lock); 596 #ifdef CONFIG_IPV6_PRIVACY 597 if (ifp->flags&IFA_F_TEMPORARY) { 598 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 599 ifap = &ifa->tmp_next) { 600 if (ifa == ifp) { 601 *ifap = ifa->tmp_next; 602 if (ifp->ifpub) { 603 in6_ifa_put(ifp->ifpub); 604 ifp->ifpub = NULL; 605 } 606 __in6_ifa_put(ifp); 607 ifa->tmp_next = NULL; 608 break; 609 } 610 } 611 } 612 #endif 613 614 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 615 if (ifa == ifp) { 616 *ifap = ifa->if_next; 617 __in6_ifa_put(ifp); 618 ifa->if_next = NULL; 619 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 620 break; 621 deleted = 1; 622 continue; 623 } else if (ifp->flags & IFA_F_PERMANENT) { 624 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 625 ifp->prefix_len)) { 626 if (ifa->flags & IFA_F_PERMANENT) { 627 onlink = 1; 628 if (deleted) 629 break; 630 } else { 631 unsigned long lifetime; 632 633 if (!onlink) 634 onlink = -1; 635 636 spin_lock(&ifa->lock); 637 lifetime = min_t(unsigned long, 638 ifa->valid_lft, 0x7fffffffUL/HZ); 639 if (time_before(expires, 640 ifa->tstamp + lifetime * HZ)) 641 expires = ifa->tstamp + lifetime * HZ; 642 spin_unlock(&ifa->lock); 643 } 644 } 645 } 646 ifap = &ifa->if_next; 647 } 648 write_unlock_bh(&idev->lock); 649 650 ipv6_ifa_notify(RTM_DELADDR, ifp); 651 652 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 653 654 addrconf_del_timer(ifp); 655 656 /* 657 * Purge or update corresponding prefix 658 * 659 * 1) we don't purge prefix here if address was not permanent. 660 * prefix is managed by its own lifetime. 661 * 2) if there're no addresses, delete prefix. 662 * 3) if there're still other permanent address(es), 663 * corresponding prefix is still permanent. 664 * 4) otherwise, update prefix lifetime to the 665 * longest valid lifetime among the corresponding 666 * addresses on the device. 667 * Note: subsequent RA will update lifetime. 668 * 669 * --yoshfuji 670 */ 671 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 672 struct in6_addr prefix; 673 struct rt6_info *rt; 674 675 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 676 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 677 678 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 679 if (onlink == 0) { 680 ip6_del_rt(rt); 681 rt = NULL; 682 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 683 rt->rt6i_expires = expires; 684 rt->rt6i_flags |= RTF_EXPIRES; 685 } 686 } 687 dst_release(&rt->u.dst); 688 } 689 690 in6_ifa_put(ifp); 691 } 692 693 #ifdef CONFIG_IPV6_PRIVACY 694 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 695 { 696 struct inet6_dev *idev = ifp->idev; 697 struct in6_addr addr, *tmpaddr; 698 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 699 int tmp_plen; 700 int ret = 0; 701 int max_addresses; 702 703 write_lock(&idev->lock); 704 if (ift) { 705 spin_lock_bh(&ift->lock); 706 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 707 spin_unlock_bh(&ift->lock); 708 tmpaddr = &addr; 709 } else { 710 tmpaddr = NULL; 711 } 712 retry: 713 in6_dev_hold(idev); 714 if (idev->cnf.use_tempaddr <= 0) { 715 write_unlock(&idev->lock); 716 printk(KERN_INFO 717 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 718 in6_dev_put(idev); 719 ret = -1; 720 goto out; 721 } 722 spin_lock_bh(&ifp->lock); 723 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 724 idev->cnf.use_tempaddr = -1; /*XXX*/ 725 spin_unlock_bh(&ifp->lock); 726 write_unlock(&idev->lock); 727 printk(KERN_WARNING 728 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 729 in6_dev_put(idev); 730 ret = -1; 731 goto out; 732 } 733 in6_ifa_hold(ifp); 734 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 735 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 736 spin_unlock_bh(&ifp->lock); 737 write_unlock(&idev->lock); 738 printk(KERN_WARNING 739 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 740 in6_ifa_put(ifp); 741 in6_dev_put(idev); 742 ret = -1; 743 goto out; 744 } 745 memcpy(&addr.s6_addr[8], idev->rndid, 8); 746 tmp_valid_lft = min_t(__u32, 747 ifp->valid_lft, 748 idev->cnf.temp_valid_lft); 749 tmp_prefered_lft = min_t(__u32, 750 ifp->prefered_lft, 751 idev->cnf.temp_prefered_lft - desync_factor / HZ); 752 tmp_plen = ifp->prefix_len; 753 max_addresses = idev->cnf.max_addresses; 754 tmp_cstamp = ifp->cstamp; 755 tmp_tstamp = ifp->tstamp; 756 spin_unlock_bh(&ifp->lock); 757 758 write_unlock(&idev->lock); 759 ift = !max_addresses || 760 ipv6_count_addresses(idev) < max_addresses ? 761 ipv6_add_addr(idev, &addr, tmp_plen, 762 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL; 763 if (!ift || IS_ERR(ift)) { 764 in6_ifa_put(ifp); 765 in6_dev_put(idev); 766 printk(KERN_INFO 767 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 768 tmpaddr = &addr; 769 write_lock(&idev->lock); 770 goto retry; 771 } 772 773 spin_lock_bh(&ift->lock); 774 ift->ifpub = ifp; 775 ift->valid_lft = tmp_valid_lft; 776 ift->prefered_lft = tmp_prefered_lft; 777 ift->cstamp = tmp_cstamp; 778 ift->tstamp = tmp_tstamp; 779 spin_unlock_bh(&ift->lock); 780 781 addrconf_dad_start(ift, 0); 782 in6_ifa_put(ift); 783 in6_dev_put(idev); 784 out: 785 return ret; 786 } 787 #endif 788 789 /* 790 * Choose an appropriate source address (RFC3484) 791 */ 792 struct ipv6_saddr_score { 793 int addr_type; 794 unsigned int attrs; 795 int matchlen; 796 int scope; 797 unsigned int rule; 798 }; 799 800 #define IPV6_SADDR_SCORE_LOCAL 0x0001 801 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 802 #define IPV6_SADDR_SCORE_HOA 0x0008 803 #define IPV6_SADDR_SCORE_OIF 0x0010 804 #define IPV6_SADDR_SCORE_LABEL 0x0020 805 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 806 807 static int inline ipv6_saddr_preferred(int type) 808 { 809 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 810 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 811 return 1; 812 return 0; 813 } 814 815 /* static matching label */ 816 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type) 817 { 818 /* 819 * prefix (longest match) label 820 * ----------------------------- 821 * ::1/128 0 822 * ::/0 1 823 * 2002::/16 2 824 * ::/96 3 825 * ::ffff:0:0/96 4 826 * fc00::/7 5 827 * 2001::/32 6 828 */ 829 if (type & IPV6_ADDR_LOOPBACK) 830 return 0; 831 else if (type & IPV6_ADDR_COMPATv4) 832 return 3; 833 else if (type & IPV6_ADDR_MAPPED) 834 return 4; 835 else if (addr->s6_addr32[0] == htonl(0x20010000)) 836 return 6; 837 else if (addr->s6_addr16[0] == htons(0x2002)) 838 return 2; 839 else if ((addr->s6_addr[0] & 0xfe) == 0xfc) 840 return 5; 841 return 1; 842 } 843 844 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 845 struct in6_addr *daddr, struct in6_addr *saddr) 846 { 847 struct ipv6_saddr_score hiscore; 848 struct inet6_ifaddr *ifa_result = NULL; 849 int daddr_type = __ipv6_addr_type(daddr); 850 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 851 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type); 852 struct net_device *dev; 853 854 memset(&hiscore, 0, sizeof(hiscore)); 855 856 read_lock(&dev_base_lock); 857 rcu_read_lock(); 858 859 for (dev = dev_base; dev; dev=dev->next) { 860 struct inet6_dev *idev; 861 struct inet6_ifaddr *ifa; 862 863 /* Rule 0: Candidate Source Address (section 4) 864 * - multicast and link-local destination address, 865 * the set of candidate source address MUST only 866 * include addresses assigned to interfaces 867 * belonging to the same link as the outgoing 868 * interface. 869 * (- For site-local destination addresses, the 870 * set of candidate source addresses MUST only 871 * include addresses assigned to interfaces 872 * belonging to the same site as the outgoing 873 * interface.) 874 */ 875 if ((daddr_type & IPV6_ADDR_MULTICAST || 876 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 877 daddr_dev && dev != daddr_dev) 878 continue; 879 880 idev = __in6_dev_get(dev); 881 if (!idev) 882 continue; 883 884 read_lock_bh(&idev->lock); 885 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 886 struct ipv6_saddr_score score; 887 888 score.addr_type = __ipv6_addr_type(&ifa->addr); 889 890 /* Rule 0: 891 * - Tentative Address (RFC2462 section 5.4) 892 * - A tentative address is not considered 893 * "assigned to an interface" in the traditional 894 * sense. 895 * - Candidate Source Address (section 4) 896 * - In any case, anycast addresses, multicast 897 * addresses, and the unspecified address MUST 898 * NOT be included in a candidate set. 899 */ 900 if (ifa->flags & IFA_F_TENTATIVE) 901 continue; 902 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 903 score.addr_type & IPV6_ADDR_MULTICAST)) { 904 LIMIT_NETDEBUG(KERN_DEBUG 905 "ADDRCONF: unspecified / multicast address" 906 "assigned as unicast address on %s", 907 dev->name); 908 continue; 909 } 910 911 score.attrs = 0; 912 score.matchlen = 0; 913 score.scope = 0; 914 score.rule = 0; 915 916 if (ifa_result == NULL) { 917 /* record it if the first available entry */ 918 goto record_it; 919 } 920 921 /* Rule 1: Prefer same address */ 922 if (hiscore.rule < 1) { 923 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 924 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 925 hiscore.rule++; 926 } 927 if (ipv6_addr_equal(&ifa->addr, daddr)) { 928 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 929 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 930 score.rule = 1; 931 goto record_it; 932 } 933 } else { 934 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 935 continue; 936 } 937 938 /* Rule 2: Prefer appropriate scope */ 939 if (hiscore.rule < 2) { 940 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 941 hiscore.rule++; 942 } 943 score.scope = __ipv6_addr_src_scope(score.addr_type); 944 if (hiscore.scope < score.scope) { 945 if (hiscore.scope < daddr_scope) { 946 score.rule = 2; 947 goto record_it; 948 } else 949 continue; 950 } else if (score.scope < hiscore.scope) { 951 if (score.scope < daddr_scope) 952 break; /* addresses sorted by scope */ 953 else { 954 score.rule = 2; 955 goto record_it; 956 } 957 } 958 959 /* Rule 3: Avoid deprecated address */ 960 if (hiscore.rule < 3) { 961 if (ipv6_saddr_preferred(hiscore.addr_type) || 962 !(ifa_result->flags & IFA_F_DEPRECATED)) 963 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 964 hiscore.rule++; 965 } 966 if (ipv6_saddr_preferred(score.addr_type) || 967 !(ifa->flags & IFA_F_DEPRECATED)) { 968 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 969 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 970 score.rule = 3; 971 goto record_it; 972 } 973 } else { 974 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 975 continue; 976 } 977 978 /* Rule 4: Prefer home address */ 979 #ifdef CONFIG_IPV6_MIP6 980 if (hiscore.rule < 4) { 981 if (ifa_result->flags & IFA_F_HOMEADDRESS) 982 hiscore.attrs |= IPV6_SADDR_SCORE_HOA; 983 hiscore.rule++; 984 } 985 if (ifa->flags & IFA_F_HOMEADDRESS) { 986 score.attrs |= IPV6_SADDR_SCORE_HOA; 987 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) { 988 score.rule = 4; 989 goto record_it; 990 } 991 } else { 992 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA) 993 continue; 994 } 995 #else 996 if (hiscore.rule < 4) 997 hiscore.rule++; 998 #endif 999 1000 /* Rule 5: Prefer outgoing interface */ 1001 if (hiscore.rule < 5) { 1002 if (daddr_dev == NULL || 1003 daddr_dev == ifa_result->idev->dev) 1004 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1005 hiscore.rule++; 1006 } 1007 if (daddr_dev == NULL || 1008 daddr_dev == ifa->idev->dev) { 1009 score.attrs |= IPV6_SADDR_SCORE_OIF; 1010 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1011 score.rule = 5; 1012 goto record_it; 1013 } 1014 } else { 1015 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1016 continue; 1017 } 1018 1019 /* Rule 6: Prefer matching label */ 1020 if (hiscore.rule < 6) { 1021 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) 1022 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1023 hiscore.rule++; 1024 } 1025 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { 1026 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1027 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1028 score.rule = 6; 1029 goto record_it; 1030 } 1031 } else { 1032 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1033 continue; 1034 } 1035 1036 #ifdef CONFIG_IPV6_PRIVACY 1037 /* Rule 7: Prefer public address 1038 * Note: prefer temprary address if use_tempaddr >= 2 1039 */ 1040 if (hiscore.rule < 7) { 1041 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1042 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1043 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1044 hiscore.rule++; 1045 } 1046 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1047 (ifa->idev->cnf.use_tempaddr >= 2)) { 1048 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1049 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1050 score.rule = 7; 1051 goto record_it; 1052 } 1053 } else { 1054 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1055 continue; 1056 } 1057 #else 1058 if (hiscore.rule < 7) 1059 hiscore.rule++; 1060 #endif 1061 /* Rule 8: Use longest matching prefix */ 1062 if (hiscore.rule < 8) { 1063 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1064 hiscore.rule++; 1065 } 1066 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1067 if (score.matchlen > hiscore.matchlen) { 1068 score.rule = 8; 1069 goto record_it; 1070 } 1071 #if 0 1072 else if (score.matchlen < hiscore.matchlen) 1073 continue; 1074 #endif 1075 1076 /* Final Rule: choose first available one */ 1077 continue; 1078 record_it: 1079 if (ifa_result) 1080 in6_ifa_put(ifa_result); 1081 in6_ifa_hold(ifa); 1082 ifa_result = ifa; 1083 hiscore = score; 1084 } 1085 read_unlock_bh(&idev->lock); 1086 } 1087 rcu_read_unlock(); 1088 read_unlock(&dev_base_lock); 1089 1090 if (!ifa_result) 1091 return -EADDRNOTAVAIL; 1092 1093 ipv6_addr_copy(saddr, &ifa_result->addr); 1094 in6_ifa_put(ifa_result); 1095 return 0; 1096 } 1097 1098 1099 int ipv6_get_saddr(struct dst_entry *dst, 1100 struct in6_addr *daddr, struct in6_addr *saddr) 1101 { 1102 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr); 1103 } 1104 1105 1106 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr) 1107 { 1108 struct inet6_dev *idev; 1109 int err = -EADDRNOTAVAIL; 1110 1111 rcu_read_lock(); 1112 if ((idev = __in6_dev_get(dev)) != NULL) { 1113 struct inet6_ifaddr *ifp; 1114 1115 read_lock_bh(&idev->lock); 1116 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1117 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1118 ipv6_addr_copy(addr, &ifp->addr); 1119 err = 0; 1120 break; 1121 } 1122 } 1123 read_unlock_bh(&idev->lock); 1124 } 1125 rcu_read_unlock(); 1126 return err; 1127 } 1128 1129 static int ipv6_count_addresses(struct inet6_dev *idev) 1130 { 1131 int cnt = 0; 1132 struct inet6_ifaddr *ifp; 1133 1134 read_lock_bh(&idev->lock); 1135 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1136 cnt++; 1137 read_unlock_bh(&idev->lock); 1138 return cnt; 1139 } 1140 1141 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1142 { 1143 struct inet6_ifaddr * ifp; 1144 u8 hash = ipv6_addr_hash(addr); 1145 1146 read_lock_bh(&addrconf_hash_lock); 1147 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1148 if (ipv6_addr_equal(&ifp->addr, addr) && 1149 !(ifp->flags&IFA_F_TENTATIVE)) { 1150 if (dev == NULL || ifp->idev->dev == dev || 1151 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1152 break; 1153 } 1154 } 1155 read_unlock_bh(&addrconf_hash_lock); 1156 return ifp != NULL; 1157 } 1158 1159 static 1160 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1161 { 1162 struct inet6_ifaddr * ifp; 1163 u8 hash = ipv6_addr_hash(addr); 1164 1165 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1166 if (ipv6_addr_equal(&ifp->addr, addr)) { 1167 if (dev == NULL || ifp->idev->dev == dev) 1168 break; 1169 } 1170 } 1171 return ifp != NULL; 1172 } 1173 1174 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1175 { 1176 struct inet6_ifaddr * ifp; 1177 u8 hash = ipv6_addr_hash(addr); 1178 1179 read_lock_bh(&addrconf_hash_lock); 1180 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1181 if (ipv6_addr_equal(&ifp->addr, addr)) { 1182 if (dev == NULL || ifp->idev->dev == dev || 1183 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1184 in6_ifa_hold(ifp); 1185 break; 1186 } 1187 } 1188 } 1189 read_unlock_bh(&addrconf_hash_lock); 1190 1191 return ifp; 1192 } 1193 1194 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1195 { 1196 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1197 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1198 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1199 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1200 int sk_ipv6only = ipv6_only_sock(sk); 1201 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1202 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1203 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1204 1205 if (!sk2_rcv_saddr && !sk_ipv6only) 1206 return 1; 1207 1208 if (addr_type2 == IPV6_ADDR_ANY && 1209 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1210 return 1; 1211 1212 if (addr_type == IPV6_ADDR_ANY && 1213 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1214 return 1; 1215 1216 if (sk2_rcv_saddr6 && 1217 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1218 return 1; 1219 1220 if (addr_type == IPV6_ADDR_MAPPED && 1221 !sk2_ipv6only && 1222 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1223 return 1; 1224 1225 return 0; 1226 } 1227 1228 /* Gets referenced address, destroys ifaddr */ 1229 1230 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1231 { 1232 if (ifp->flags&IFA_F_PERMANENT) { 1233 spin_lock_bh(&ifp->lock); 1234 addrconf_del_timer(ifp); 1235 ifp->flags |= IFA_F_TENTATIVE; 1236 spin_unlock_bh(&ifp->lock); 1237 in6_ifa_put(ifp); 1238 #ifdef CONFIG_IPV6_PRIVACY 1239 } else if (ifp->flags&IFA_F_TEMPORARY) { 1240 struct inet6_ifaddr *ifpub; 1241 spin_lock_bh(&ifp->lock); 1242 ifpub = ifp->ifpub; 1243 if (ifpub) { 1244 in6_ifa_hold(ifpub); 1245 spin_unlock_bh(&ifp->lock); 1246 ipv6_create_tempaddr(ifpub, ifp); 1247 in6_ifa_put(ifpub); 1248 } else { 1249 spin_unlock_bh(&ifp->lock); 1250 } 1251 ipv6_del_addr(ifp); 1252 #endif 1253 } else 1254 ipv6_del_addr(ifp); 1255 } 1256 1257 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1258 { 1259 if (net_ratelimit()) 1260 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1261 addrconf_dad_stop(ifp); 1262 } 1263 1264 /* Join to solicited addr multicast group. */ 1265 1266 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1267 { 1268 struct in6_addr maddr; 1269 1270 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1271 return; 1272 1273 addrconf_addr_solict_mult(addr, &maddr); 1274 ipv6_dev_mc_inc(dev, &maddr); 1275 } 1276 1277 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1278 { 1279 struct in6_addr maddr; 1280 1281 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1282 return; 1283 1284 addrconf_addr_solict_mult(addr, &maddr); 1285 __ipv6_dev_mc_dec(idev, &maddr); 1286 } 1287 1288 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1289 { 1290 struct in6_addr addr; 1291 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1292 if (ipv6_addr_any(&addr)) 1293 return; 1294 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1295 } 1296 1297 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1298 { 1299 struct in6_addr addr; 1300 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1301 if (ipv6_addr_any(&addr)) 1302 return; 1303 __ipv6_dev_ac_dec(ifp->idev, &addr); 1304 } 1305 1306 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1307 { 1308 if (dev->addr_len != ETH_ALEN) 1309 return -1; 1310 memcpy(eui, dev->dev_addr, 3); 1311 memcpy(eui + 5, dev->dev_addr + 3, 3); 1312 1313 /* 1314 * The zSeries OSA network cards can be shared among various 1315 * OS instances, but the OSA cards have only one MAC address. 1316 * This leads to duplicate address conflicts in conjunction 1317 * with IPv6 if more than one instance uses the same card. 1318 * 1319 * The driver for these cards can deliver a unique 16-bit 1320 * identifier for each instance sharing the same card. It is 1321 * placed instead of 0xFFFE in the interface identifier. The 1322 * "u" bit of the interface identifier is not inverted in this 1323 * case. Hence the resulting interface identifier has local 1324 * scope according to RFC2373. 1325 */ 1326 if (dev->dev_id) { 1327 eui[3] = (dev->dev_id >> 8) & 0xFF; 1328 eui[4] = dev->dev_id & 0xFF; 1329 } else { 1330 eui[3] = 0xFF; 1331 eui[4] = 0xFE; 1332 eui[0] ^= 2; 1333 } 1334 return 0; 1335 } 1336 1337 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1338 { 1339 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1340 if (dev->addr_len != ARCNET_ALEN) 1341 return -1; 1342 memset(eui, 0, 7); 1343 eui[7] = *(u8*)dev->dev_addr; 1344 return 0; 1345 } 1346 1347 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1348 { 1349 if (dev->addr_len != INFINIBAND_ALEN) 1350 return -1; 1351 memcpy(eui, dev->dev_addr + 12, 8); 1352 eui[0] |= 2; 1353 return 0; 1354 } 1355 1356 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1357 { 1358 switch (dev->type) { 1359 case ARPHRD_ETHER: 1360 case ARPHRD_FDDI: 1361 case ARPHRD_IEEE802_TR: 1362 return addrconf_ifid_eui48(eui, dev); 1363 case ARPHRD_ARCNET: 1364 return addrconf_ifid_arcnet(eui, dev); 1365 case ARPHRD_INFINIBAND: 1366 return addrconf_ifid_infiniband(eui, dev); 1367 } 1368 return -1; 1369 } 1370 1371 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1372 { 1373 int err = -1; 1374 struct inet6_ifaddr *ifp; 1375 1376 read_lock_bh(&idev->lock); 1377 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1378 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1379 memcpy(eui, ifp->addr.s6_addr+8, 8); 1380 err = 0; 1381 break; 1382 } 1383 } 1384 read_unlock_bh(&idev->lock); 1385 return err; 1386 } 1387 1388 #ifdef CONFIG_IPV6_PRIVACY 1389 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1390 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1391 { 1392 regen: 1393 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1394 idev->rndid[0] &= ~0x02; 1395 1396 /* 1397 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1398 * check if generated address is not inappropriate 1399 * 1400 * - Reserved subnet anycast (RFC 2526) 1401 * 11111101 11....11 1xxxxxxx 1402 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 1403 * 00-00-5E-FE-xx-xx-xx-xx 1404 * - value 0 1405 * - XXX: already assigned to an address on the device 1406 */ 1407 if (idev->rndid[0] == 0xfd && 1408 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1409 (idev->rndid[7]&0x80)) 1410 goto regen; 1411 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1412 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1413 goto regen; 1414 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1415 goto regen; 1416 } 1417 1418 return 0; 1419 } 1420 1421 static void ipv6_regen_rndid(unsigned long data) 1422 { 1423 struct inet6_dev *idev = (struct inet6_dev *) data; 1424 unsigned long expires; 1425 1426 rcu_read_lock_bh(); 1427 write_lock_bh(&idev->lock); 1428 1429 if (idev->dead) 1430 goto out; 1431 1432 if (__ipv6_regen_rndid(idev) < 0) 1433 goto out; 1434 1435 expires = jiffies + 1436 idev->cnf.temp_prefered_lft * HZ - 1437 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1438 if (time_before(expires, jiffies)) { 1439 printk(KERN_WARNING 1440 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1441 idev->dev->name); 1442 goto out; 1443 } 1444 1445 if (!mod_timer(&idev->regen_timer, expires)) 1446 in6_dev_hold(idev); 1447 1448 out: 1449 write_unlock_bh(&idev->lock); 1450 rcu_read_unlock_bh(); 1451 in6_dev_put(idev); 1452 } 1453 1454 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1455 int ret = 0; 1456 1457 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1458 ret = __ipv6_regen_rndid(idev); 1459 return ret; 1460 } 1461 #endif 1462 1463 /* 1464 * Add prefix route. 1465 */ 1466 1467 static void 1468 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1469 unsigned long expires, u32 flags) 1470 { 1471 struct fib6_config cfg = { 1472 .fc_table = RT6_TABLE_PREFIX, 1473 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1474 .fc_ifindex = dev->ifindex, 1475 .fc_expires = expires, 1476 .fc_dst_len = plen, 1477 .fc_flags = RTF_UP | flags, 1478 }; 1479 1480 ipv6_addr_copy(&cfg.fc_dst, pfx); 1481 1482 /* Prevent useless cloning on PtP SIT. 1483 This thing is done here expecting that the whole 1484 class of non-broadcast devices need not cloning. 1485 */ 1486 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1487 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1488 cfg.fc_flags |= RTF_NONEXTHOP; 1489 #endif 1490 1491 ip6_route_add(&cfg); 1492 } 1493 1494 /* Create "default" multicast route to the interface */ 1495 1496 static void addrconf_add_mroute(struct net_device *dev) 1497 { 1498 struct fib6_config cfg = { 1499 .fc_table = RT6_TABLE_LOCAL, 1500 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1501 .fc_ifindex = dev->ifindex, 1502 .fc_dst_len = 8, 1503 .fc_flags = RTF_UP, 1504 }; 1505 1506 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1507 1508 ip6_route_add(&cfg); 1509 } 1510 1511 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1512 static void sit_route_add(struct net_device *dev) 1513 { 1514 struct fib6_config cfg = { 1515 .fc_table = RT6_TABLE_MAIN, 1516 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1517 .fc_ifindex = dev->ifindex, 1518 .fc_dst_len = 96, 1519 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1520 }; 1521 1522 /* prefix length - 96 bits "::d.d.d.d" */ 1523 ip6_route_add(&cfg); 1524 } 1525 #endif 1526 1527 static void addrconf_add_lroute(struct net_device *dev) 1528 { 1529 struct in6_addr addr; 1530 1531 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1532 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1533 } 1534 1535 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1536 { 1537 struct inet6_dev *idev; 1538 1539 ASSERT_RTNL(); 1540 1541 if ((idev = ipv6_find_idev(dev)) == NULL) 1542 return NULL; 1543 1544 /* Add default multicast route */ 1545 addrconf_add_mroute(dev); 1546 1547 /* Add link local route */ 1548 addrconf_add_lroute(dev); 1549 return idev; 1550 } 1551 1552 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1553 { 1554 struct prefix_info *pinfo; 1555 __u32 valid_lft; 1556 __u32 prefered_lft; 1557 int addr_type; 1558 unsigned long rt_expires; 1559 struct inet6_dev *in6_dev; 1560 1561 pinfo = (struct prefix_info *) opt; 1562 1563 if (len < sizeof(struct prefix_info)) { 1564 ADBG(("addrconf: prefix option too short\n")); 1565 return; 1566 } 1567 1568 /* 1569 * Validation checks ([ADDRCONF], page 19) 1570 */ 1571 1572 addr_type = ipv6_addr_type(&pinfo->prefix); 1573 1574 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1575 return; 1576 1577 valid_lft = ntohl(pinfo->valid); 1578 prefered_lft = ntohl(pinfo->prefered); 1579 1580 if (prefered_lft > valid_lft) { 1581 if (net_ratelimit()) 1582 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1583 return; 1584 } 1585 1586 in6_dev = in6_dev_get(dev); 1587 1588 if (in6_dev == NULL) { 1589 if (net_ratelimit()) 1590 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1591 return; 1592 } 1593 1594 /* 1595 * Two things going on here: 1596 * 1) Add routes for on-link prefixes 1597 * 2) Configure prefixes with the auto flag set 1598 */ 1599 1600 /* Avoid arithmetic overflow. Really, we could 1601 save rt_expires in seconds, likely valid_lft, 1602 but it would require division in fib gc, that it 1603 not good. 1604 */ 1605 if (valid_lft >= 0x7FFFFFFF/HZ) 1606 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1607 else 1608 rt_expires = valid_lft * HZ; 1609 1610 /* 1611 * We convert this (in jiffies) to clock_t later. 1612 * Avoid arithmetic overflow there as well. 1613 * Overflow can happen only if HZ < USER_HZ. 1614 */ 1615 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1616 rt_expires = 0x7FFFFFFF / USER_HZ; 1617 1618 if (pinfo->onlink) { 1619 struct rt6_info *rt; 1620 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1621 1622 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1623 if (rt->rt6i_flags&RTF_EXPIRES) { 1624 if (valid_lft == 0) { 1625 ip6_del_rt(rt); 1626 rt = NULL; 1627 } else { 1628 rt->rt6i_expires = jiffies + rt_expires; 1629 } 1630 } 1631 } else if (valid_lft) { 1632 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1633 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1634 } 1635 if (rt) 1636 dst_release(&rt->u.dst); 1637 } 1638 1639 /* Try to figure out our local address for this prefix */ 1640 1641 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1642 struct inet6_ifaddr * ifp; 1643 struct in6_addr addr; 1644 int create = 0, update_lft = 0; 1645 1646 if (pinfo->prefix_len == 64) { 1647 memcpy(&addr, &pinfo->prefix, 8); 1648 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1649 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1650 in6_dev_put(in6_dev); 1651 return; 1652 } 1653 goto ok; 1654 } 1655 if (net_ratelimit()) 1656 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1657 pinfo->prefix_len); 1658 in6_dev_put(in6_dev); 1659 return; 1660 1661 ok: 1662 1663 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1664 1665 if (ifp == NULL && valid_lft) { 1666 int max_addresses = in6_dev->cnf.max_addresses; 1667 1668 /* Do not allow to create too much of autoconfigured 1669 * addresses; this would be too easy way to crash kernel. 1670 */ 1671 if (!max_addresses || 1672 ipv6_count_addresses(in6_dev) < max_addresses) 1673 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1674 addr_type&IPV6_ADDR_SCOPE_MASK, 0); 1675 1676 if (!ifp || IS_ERR(ifp)) { 1677 in6_dev_put(in6_dev); 1678 return; 1679 } 1680 1681 update_lft = create = 1; 1682 ifp->cstamp = jiffies; 1683 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1684 } 1685 1686 if (ifp) { 1687 int flags; 1688 unsigned long now; 1689 #ifdef CONFIG_IPV6_PRIVACY 1690 struct inet6_ifaddr *ift; 1691 #endif 1692 u32 stored_lft; 1693 1694 /* update lifetime (RFC2462 5.5.3 e) */ 1695 spin_lock(&ifp->lock); 1696 now = jiffies; 1697 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1698 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1699 else 1700 stored_lft = 0; 1701 if (!update_lft && stored_lft) { 1702 if (valid_lft > MIN_VALID_LIFETIME || 1703 valid_lft > stored_lft) 1704 update_lft = 1; 1705 else if (stored_lft <= MIN_VALID_LIFETIME) { 1706 /* valid_lft <= stored_lft is always true */ 1707 /* XXX: IPsec */ 1708 update_lft = 0; 1709 } else { 1710 valid_lft = MIN_VALID_LIFETIME; 1711 if (valid_lft < prefered_lft) 1712 prefered_lft = valid_lft; 1713 update_lft = 1; 1714 } 1715 } 1716 1717 if (update_lft) { 1718 ifp->valid_lft = valid_lft; 1719 ifp->prefered_lft = prefered_lft; 1720 ifp->tstamp = now; 1721 flags = ifp->flags; 1722 ifp->flags &= ~IFA_F_DEPRECATED; 1723 spin_unlock(&ifp->lock); 1724 1725 if (!(flags&IFA_F_TENTATIVE)) 1726 ipv6_ifa_notify(0, ifp); 1727 } else 1728 spin_unlock(&ifp->lock); 1729 1730 #ifdef CONFIG_IPV6_PRIVACY 1731 read_lock_bh(&in6_dev->lock); 1732 /* update all temporary addresses in the list */ 1733 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1734 /* 1735 * When adjusting the lifetimes of an existing 1736 * temporary address, only lower the lifetimes. 1737 * Implementations must not increase the 1738 * lifetimes of an existing temporary address 1739 * when processing a Prefix Information Option. 1740 */ 1741 spin_lock(&ift->lock); 1742 flags = ift->flags; 1743 if (ift->valid_lft > valid_lft && 1744 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1745 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1746 if (ift->prefered_lft > prefered_lft && 1747 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1748 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1749 spin_unlock(&ift->lock); 1750 if (!(flags&IFA_F_TENTATIVE)) 1751 ipv6_ifa_notify(0, ift); 1752 } 1753 1754 if (create && in6_dev->cnf.use_tempaddr > 0) { 1755 /* 1756 * When a new public address is created as described in [ADDRCONF], 1757 * also create a new temporary address. 1758 */ 1759 read_unlock_bh(&in6_dev->lock); 1760 ipv6_create_tempaddr(ifp, NULL); 1761 } else { 1762 read_unlock_bh(&in6_dev->lock); 1763 } 1764 #endif 1765 in6_ifa_put(ifp); 1766 addrconf_verify(0); 1767 } 1768 } 1769 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1770 in6_dev_put(in6_dev); 1771 } 1772 1773 /* 1774 * Set destination address. 1775 * Special case for SIT interfaces where we create a new "virtual" 1776 * device. 1777 */ 1778 int addrconf_set_dstaddr(void __user *arg) 1779 { 1780 struct in6_ifreq ireq; 1781 struct net_device *dev; 1782 int err = -EINVAL; 1783 1784 rtnl_lock(); 1785 1786 err = -EFAULT; 1787 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1788 goto err_exit; 1789 1790 dev = __dev_get_by_index(ireq.ifr6_ifindex); 1791 1792 err = -ENODEV; 1793 if (dev == NULL) 1794 goto err_exit; 1795 1796 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1797 if (dev->type == ARPHRD_SIT) { 1798 struct ifreq ifr; 1799 mm_segment_t oldfs; 1800 struct ip_tunnel_parm p; 1801 1802 err = -EADDRNOTAVAIL; 1803 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1804 goto err_exit; 1805 1806 memset(&p, 0, sizeof(p)); 1807 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1808 p.iph.saddr = 0; 1809 p.iph.version = 4; 1810 p.iph.ihl = 5; 1811 p.iph.protocol = IPPROTO_IPV6; 1812 p.iph.ttl = 64; 1813 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1814 1815 oldfs = get_fs(); set_fs(KERNEL_DS); 1816 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1817 set_fs(oldfs); 1818 1819 if (err == 0) { 1820 err = -ENOBUFS; 1821 if ((dev = __dev_get_by_name(p.name)) == NULL) 1822 goto err_exit; 1823 err = dev_open(dev); 1824 } 1825 } 1826 #endif 1827 1828 err_exit: 1829 rtnl_unlock(); 1830 return err; 1831 } 1832 1833 /* 1834 * Manual configuration of address on an interface 1835 */ 1836 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1837 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft) 1838 { 1839 struct inet6_ifaddr *ifp; 1840 struct inet6_dev *idev; 1841 struct net_device *dev; 1842 int scope; 1843 u32 flags = RTF_EXPIRES; 1844 1845 ASSERT_RTNL(); 1846 1847 /* check the lifetime */ 1848 if (!valid_lft || prefered_lft > valid_lft) 1849 return -EINVAL; 1850 1851 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1852 return -ENODEV; 1853 1854 if ((idev = addrconf_add_dev(dev)) == NULL) 1855 return -ENOBUFS; 1856 1857 scope = ipv6_addr_scope(pfx); 1858 1859 if (valid_lft == INFINITY_LIFE_TIME) { 1860 ifa_flags |= IFA_F_PERMANENT; 1861 flags = 0; 1862 } else if (valid_lft >= 0x7FFFFFFF/HZ) 1863 valid_lft = 0x7FFFFFFF/HZ; 1864 1865 if (prefered_lft == 0) 1866 ifa_flags |= IFA_F_DEPRECATED; 1867 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1868 (prefered_lft != INFINITY_LIFE_TIME)) 1869 prefered_lft = 0x7FFFFFFF/HZ; 1870 1871 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1872 1873 if (!IS_ERR(ifp)) { 1874 spin_lock_bh(&ifp->lock); 1875 ifp->valid_lft = valid_lft; 1876 ifp->prefered_lft = prefered_lft; 1877 ifp->tstamp = jiffies; 1878 spin_unlock_bh(&ifp->lock); 1879 1880 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 1881 jiffies_to_clock_t(valid_lft * HZ), flags); 1882 addrconf_dad_start(ifp, 0); 1883 in6_ifa_put(ifp); 1884 addrconf_verify(0); 1885 return 0; 1886 } 1887 1888 return PTR_ERR(ifp); 1889 } 1890 1891 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1892 { 1893 struct inet6_ifaddr *ifp; 1894 struct inet6_dev *idev; 1895 struct net_device *dev; 1896 1897 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1898 return -ENODEV; 1899 1900 if ((idev = __in6_dev_get(dev)) == NULL) 1901 return -ENXIO; 1902 1903 read_lock_bh(&idev->lock); 1904 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1905 if (ifp->prefix_len == plen && 1906 ipv6_addr_equal(pfx, &ifp->addr)) { 1907 in6_ifa_hold(ifp); 1908 read_unlock_bh(&idev->lock); 1909 1910 ipv6_del_addr(ifp); 1911 1912 /* If the last address is deleted administratively, 1913 disable IPv6 on this interface. 1914 */ 1915 if (idev->addr_list == NULL) 1916 addrconf_ifdown(idev->dev, 1); 1917 return 0; 1918 } 1919 } 1920 read_unlock_bh(&idev->lock); 1921 return -EADDRNOTAVAIL; 1922 } 1923 1924 1925 int addrconf_add_ifaddr(void __user *arg) 1926 { 1927 struct in6_ifreq ireq; 1928 int err; 1929 1930 if (!capable(CAP_NET_ADMIN)) 1931 return -EPERM; 1932 1933 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1934 return -EFAULT; 1935 1936 rtnl_lock(); 1937 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 1938 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 1939 rtnl_unlock(); 1940 return err; 1941 } 1942 1943 int addrconf_del_ifaddr(void __user *arg) 1944 { 1945 struct in6_ifreq ireq; 1946 int err; 1947 1948 if (!capable(CAP_NET_ADMIN)) 1949 return -EPERM; 1950 1951 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1952 return -EFAULT; 1953 1954 rtnl_lock(); 1955 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 1956 rtnl_unlock(); 1957 return err; 1958 } 1959 1960 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1961 static void sit_add_v4_addrs(struct inet6_dev *idev) 1962 { 1963 struct inet6_ifaddr * ifp; 1964 struct in6_addr addr; 1965 struct net_device *dev; 1966 int scope; 1967 1968 ASSERT_RTNL(); 1969 1970 memset(&addr, 0, sizeof(struct in6_addr)); 1971 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 1972 1973 if (idev->dev->flags&IFF_POINTOPOINT) { 1974 addr.s6_addr32[0] = htonl(0xfe800000); 1975 scope = IFA_LINK; 1976 } else { 1977 scope = IPV6_ADDR_COMPATv4; 1978 } 1979 1980 if (addr.s6_addr32[3]) { 1981 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 1982 if (!IS_ERR(ifp)) { 1983 spin_lock_bh(&ifp->lock); 1984 ifp->flags &= ~IFA_F_TENTATIVE; 1985 spin_unlock_bh(&ifp->lock); 1986 ipv6_ifa_notify(RTM_NEWADDR, ifp); 1987 in6_ifa_put(ifp); 1988 } 1989 return; 1990 } 1991 1992 for (dev = dev_base; dev != NULL; dev = dev->next) { 1993 struct in_device * in_dev = __in_dev_get_rtnl(dev); 1994 if (in_dev && (dev->flags & IFF_UP)) { 1995 struct in_ifaddr * ifa; 1996 1997 int flag = scope; 1998 1999 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2000 int plen; 2001 2002 addr.s6_addr32[3] = ifa->ifa_local; 2003 2004 if (ifa->ifa_scope == RT_SCOPE_LINK) 2005 continue; 2006 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2007 if (idev->dev->flags&IFF_POINTOPOINT) 2008 continue; 2009 flag |= IFA_HOST; 2010 } 2011 if (idev->dev->flags&IFF_POINTOPOINT) 2012 plen = 64; 2013 else 2014 plen = 96; 2015 2016 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2017 IFA_F_PERMANENT); 2018 if (!IS_ERR(ifp)) { 2019 spin_lock_bh(&ifp->lock); 2020 ifp->flags &= ~IFA_F_TENTATIVE; 2021 spin_unlock_bh(&ifp->lock); 2022 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2023 in6_ifa_put(ifp); 2024 } 2025 } 2026 } 2027 } 2028 } 2029 #endif 2030 2031 static void init_loopback(struct net_device *dev) 2032 { 2033 struct inet6_dev *idev; 2034 struct inet6_ifaddr * ifp; 2035 2036 /* ::1 */ 2037 2038 ASSERT_RTNL(); 2039 2040 if ((idev = ipv6_find_idev(dev)) == NULL) { 2041 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2042 return; 2043 } 2044 2045 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2046 if (!IS_ERR(ifp)) { 2047 spin_lock_bh(&ifp->lock); 2048 ifp->flags &= ~IFA_F_TENTATIVE; 2049 spin_unlock_bh(&ifp->lock); 2050 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2051 in6_ifa_put(ifp); 2052 } 2053 } 2054 2055 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2056 { 2057 struct inet6_ifaddr * ifp; 2058 2059 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT); 2060 if (!IS_ERR(ifp)) { 2061 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2062 addrconf_dad_start(ifp, 0); 2063 in6_ifa_put(ifp); 2064 } 2065 } 2066 2067 static void addrconf_dev_config(struct net_device *dev) 2068 { 2069 struct in6_addr addr; 2070 struct inet6_dev * idev; 2071 2072 ASSERT_RTNL(); 2073 2074 if ((dev->type != ARPHRD_ETHER) && 2075 (dev->type != ARPHRD_FDDI) && 2076 (dev->type != ARPHRD_IEEE802_TR) && 2077 (dev->type != ARPHRD_ARCNET) && 2078 (dev->type != ARPHRD_INFINIBAND)) { 2079 /* Alas, we support only Ethernet autoconfiguration. */ 2080 return; 2081 } 2082 2083 idev = addrconf_add_dev(dev); 2084 if (idev == NULL) 2085 return; 2086 2087 memset(&addr, 0, sizeof(struct in6_addr)); 2088 addr.s6_addr32[0] = htonl(0xFE800000); 2089 2090 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2091 addrconf_add_linklocal(idev, &addr); 2092 } 2093 2094 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2095 static void addrconf_sit_config(struct net_device *dev) 2096 { 2097 struct inet6_dev *idev; 2098 2099 ASSERT_RTNL(); 2100 2101 /* 2102 * Configure the tunnel with one of our IPv4 2103 * addresses... we should configure all of 2104 * our v4 addrs in the tunnel 2105 */ 2106 2107 if ((idev = ipv6_find_idev(dev)) == NULL) { 2108 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2109 return; 2110 } 2111 2112 sit_add_v4_addrs(idev); 2113 2114 if (dev->flags&IFF_POINTOPOINT) { 2115 addrconf_add_mroute(dev); 2116 addrconf_add_lroute(dev); 2117 } else 2118 sit_route_add(dev); 2119 } 2120 #endif 2121 2122 static inline int 2123 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2124 { 2125 struct in6_addr lladdr; 2126 2127 if (!ipv6_get_lladdr(link_dev, &lladdr)) { 2128 addrconf_add_linklocal(idev, &lladdr); 2129 return 0; 2130 } 2131 return -1; 2132 } 2133 2134 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2135 { 2136 struct net_device *link_dev; 2137 2138 /* first try to inherit the link-local address from the link device */ 2139 if (idev->dev->iflink && 2140 (link_dev = __dev_get_by_index(idev->dev->iflink))) { 2141 if (!ipv6_inherit_linklocal(idev, link_dev)) 2142 return; 2143 } 2144 /* then try to inherit it from any device */ 2145 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) { 2146 if (!ipv6_inherit_linklocal(idev, link_dev)) 2147 return; 2148 } 2149 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2150 } 2151 2152 /* 2153 * Autoconfigure tunnel with a link-local address so routing protocols, 2154 * DHCPv6, MLD etc. can be run over the virtual link 2155 */ 2156 2157 static void addrconf_ip6_tnl_config(struct net_device *dev) 2158 { 2159 struct inet6_dev *idev; 2160 2161 ASSERT_RTNL(); 2162 2163 if ((idev = addrconf_add_dev(dev)) == NULL) { 2164 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2165 return; 2166 } 2167 ip6_tnl_add_linklocal(idev); 2168 } 2169 2170 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2171 void * data) 2172 { 2173 struct net_device *dev = (struct net_device *) data; 2174 struct inet6_dev *idev = __in6_dev_get(dev); 2175 int run_pending = 0; 2176 2177 switch(event) { 2178 case NETDEV_REGISTER: 2179 if (!idev) { 2180 idev = ipv6_add_dev(dev); 2181 if (!idev) 2182 printk(KERN_WARNING "IPv6: add_dev failed for %s\n", 2183 dev->name); 2184 } 2185 break; 2186 case NETDEV_UP: 2187 case NETDEV_CHANGE: 2188 if (event == NETDEV_UP) { 2189 if (!netif_carrier_ok(dev)) { 2190 /* device is not ready yet. */ 2191 printk(KERN_INFO 2192 "ADDRCONF(NETDEV_UP): %s: " 2193 "link is not ready\n", 2194 dev->name); 2195 break; 2196 } 2197 2198 if (idev) 2199 idev->if_flags |= IF_READY; 2200 } else { 2201 if (!netif_carrier_ok(dev)) { 2202 /* device is still not ready. */ 2203 break; 2204 } 2205 2206 if (idev) { 2207 if (idev->if_flags & IF_READY) { 2208 /* device is already configured. */ 2209 break; 2210 } 2211 idev->if_flags |= IF_READY; 2212 } 2213 2214 printk(KERN_INFO 2215 "ADDRCONF(NETDEV_CHANGE): %s: " 2216 "link becomes ready\n", 2217 dev->name); 2218 2219 run_pending = 1; 2220 } 2221 2222 switch(dev->type) { 2223 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2224 case ARPHRD_SIT: 2225 addrconf_sit_config(dev); 2226 break; 2227 #endif 2228 case ARPHRD_TUNNEL6: 2229 addrconf_ip6_tnl_config(dev); 2230 break; 2231 case ARPHRD_LOOPBACK: 2232 init_loopback(dev); 2233 break; 2234 2235 default: 2236 addrconf_dev_config(dev); 2237 break; 2238 }; 2239 if (idev) { 2240 if (run_pending) 2241 addrconf_dad_run(idev); 2242 2243 /* If the MTU changed during the interface down, when the 2244 interface up, the changed MTU must be reflected in the 2245 idev as well as routers. 2246 */ 2247 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2248 rt6_mtu_change(dev, dev->mtu); 2249 idev->cnf.mtu6 = dev->mtu; 2250 } 2251 idev->tstamp = jiffies; 2252 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2253 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2254 stop IPv6 on this interface. 2255 */ 2256 if (dev->mtu < IPV6_MIN_MTU) 2257 addrconf_ifdown(dev, event != NETDEV_DOWN); 2258 } 2259 break; 2260 2261 case NETDEV_CHANGEMTU: 2262 if ( idev && dev->mtu >= IPV6_MIN_MTU) { 2263 rt6_mtu_change(dev, dev->mtu); 2264 idev->cnf.mtu6 = dev->mtu; 2265 break; 2266 } 2267 2268 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2269 2270 case NETDEV_DOWN: 2271 case NETDEV_UNREGISTER: 2272 /* 2273 * Remove all addresses from this interface. 2274 */ 2275 addrconf_ifdown(dev, event != NETDEV_DOWN); 2276 break; 2277 2278 case NETDEV_CHANGENAME: 2279 #ifdef CONFIG_SYSCTL 2280 if (idev) { 2281 addrconf_sysctl_unregister(&idev->cnf); 2282 neigh_sysctl_unregister(idev->nd_parms); 2283 neigh_sysctl_register(dev, idev->nd_parms, 2284 NET_IPV6, NET_IPV6_NEIGH, "ipv6", 2285 &ndisc_ifinfo_sysctl_change, 2286 NULL); 2287 addrconf_sysctl_register(idev, &idev->cnf); 2288 } 2289 #endif 2290 break; 2291 }; 2292 2293 return NOTIFY_OK; 2294 } 2295 2296 /* 2297 * addrconf module should be notified of a device going up 2298 */ 2299 static struct notifier_block ipv6_dev_notf = { 2300 .notifier_call = addrconf_notify, 2301 .priority = 0 2302 }; 2303 2304 static int addrconf_ifdown(struct net_device *dev, int how) 2305 { 2306 struct inet6_dev *idev; 2307 struct inet6_ifaddr *ifa, **bifa; 2308 int i; 2309 2310 ASSERT_RTNL(); 2311 2312 if (dev == &loopback_dev && how == 1) 2313 how = 0; 2314 2315 rt6_ifdown(dev); 2316 neigh_ifdown(&nd_tbl, dev); 2317 2318 idev = __in6_dev_get(dev); 2319 if (idev == NULL) 2320 return -ENODEV; 2321 2322 /* Step 1: remove reference to ipv6 device from parent device. 2323 Do not dev_put! 2324 */ 2325 if (how == 1) { 2326 idev->dead = 1; 2327 2328 /* protected by rtnl_lock */ 2329 rcu_assign_pointer(dev->ip6_ptr, NULL); 2330 2331 /* Step 1.5: remove snmp6 entry */ 2332 snmp6_unregister_dev(idev); 2333 2334 } 2335 2336 /* Step 2: clear hash table */ 2337 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2338 bifa = &inet6_addr_lst[i]; 2339 2340 write_lock_bh(&addrconf_hash_lock); 2341 while ((ifa = *bifa) != NULL) { 2342 if (ifa->idev == idev) { 2343 *bifa = ifa->lst_next; 2344 ifa->lst_next = NULL; 2345 addrconf_del_timer(ifa); 2346 in6_ifa_put(ifa); 2347 continue; 2348 } 2349 bifa = &ifa->lst_next; 2350 } 2351 write_unlock_bh(&addrconf_hash_lock); 2352 } 2353 2354 write_lock_bh(&idev->lock); 2355 2356 /* Step 3: clear flags for stateless addrconf */ 2357 if (how != 1) 2358 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2359 2360 /* Step 4: clear address list */ 2361 #ifdef CONFIG_IPV6_PRIVACY 2362 if (how == 1 && del_timer(&idev->regen_timer)) 2363 in6_dev_put(idev); 2364 2365 /* clear tempaddr list */ 2366 while ((ifa = idev->tempaddr_list) != NULL) { 2367 idev->tempaddr_list = ifa->tmp_next; 2368 ifa->tmp_next = NULL; 2369 ifa->dead = 1; 2370 write_unlock_bh(&idev->lock); 2371 spin_lock_bh(&ifa->lock); 2372 2373 if (ifa->ifpub) { 2374 in6_ifa_put(ifa->ifpub); 2375 ifa->ifpub = NULL; 2376 } 2377 spin_unlock_bh(&ifa->lock); 2378 in6_ifa_put(ifa); 2379 write_lock_bh(&idev->lock); 2380 } 2381 #endif 2382 while ((ifa = idev->addr_list) != NULL) { 2383 idev->addr_list = ifa->if_next; 2384 ifa->if_next = NULL; 2385 ifa->dead = 1; 2386 addrconf_del_timer(ifa); 2387 write_unlock_bh(&idev->lock); 2388 2389 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2390 in6_ifa_put(ifa); 2391 2392 write_lock_bh(&idev->lock); 2393 } 2394 write_unlock_bh(&idev->lock); 2395 2396 /* Step 5: Discard multicast list */ 2397 2398 if (how == 1) 2399 ipv6_mc_destroy_dev(idev); 2400 else 2401 ipv6_mc_down(idev); 2402 2403 /* Step 5: netlink notification of this interface */ 2404 idev->tstamp = jiffies; 2405 inet6_ifinfo_notify(RTM_DELLINK, idev); 2406 2407 /* Shot the device (if unregistered) */ 2408 2409 if (how == 1) { 2410 #ifdef CONFIG_SYSCTL 2411 addrconf_sysctl_unregister(&idev->cnf); 2412 neigh_sysctl_unregister(idev->nd_parms); 2413 #endif 2414 neigh_parms_release(&nd_tbl, idev->nd_parms); 2415 neigh_ifdown(&nd_tbl, dev); 2416 in6_dev_put(idev); 2417 } 2418 return 0; 2419 } 2420 2421 static void addrconf_rs_timer(unsigned long data) 2422 { 2423 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2424 2425 if (ifp->idev->cnf.forwarding) 2426 goto out; 2427 2428 if (ifp->idev->if_flags & IF_RA_RCVD) { 2429 /* 2430 * Announcement received after solicitation 2431 * was sent 2432 */ 2433 goto out; 2434 } 2435 2436 spin_lock(&ifp->lock); 2437 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2438 struct in6_addr all_routers; 2439 2440 /* The wait after the last probe can be shorter */ 2441 addrconf_mod_timer(ifp, AC_RS, 2442 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2443 ifp->idev->cnf.rtr_solicit_delay : 2444 ifp->idev->cnf.rtr_solicit_interval); 2445 spin_unlock(&ifp->lock); 2446 2447 ipv6_addr_all_routers(&all_routers); 2448 2449 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2450 } else { 2451 spin_unlock(&ifp->lock); 2452 /* 2453 * Note: we do not support deprecated "all on-link" 2454 * assumption any longer. 2455 */ 2456 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2457 ifp->idev->dev->name); 2458 } 2459 2460 out: 2461 in6_ifa_put(ifp); 2462 } 2463 2464 /* 2465 * Duplicate Address Detection 2466 */ 2467 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2468 { 2469 unsigned long rand_num; 2470 struct inet6_dev *idev = ifp->idev; 2471 2472 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2473 ifp->probes = idev->cnf.dad_transmits; 2474 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2475 } 2476 2477 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2478 { 2479 struct inet6_dev *idev = ifp->idev; 2480 struct net_device *dev = idev->dev; 2481 2482 addrconf_join_solict(dev, &ifp->addr); 2483 2484 net_srandom(ifp->addr.s6_addr32[3]); 2485 2486 read_lock_bh(&idev->lock); 2487 if (ifp->dead) 2488 goto out; 2489 spin_lock_bh(&ifp->lock); 2490 2491 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2492 !(ifp->flags&IFA_F_TENTATIVE) || 2493 ifp->flags & IFA_F_NODAD) { 2494 ifp->flags &= ~IFA_F_TENTATIVE; 2495 spin_unlock_bh(&ifp->lock); 2496 read_unlock_bh(&idev->lock); 2497 2498 addrconf_dad_completed(ifp); 2499 return; 2500 } 2501 2502 if (!(idev->if_flags & IF_READY)) { 2503 spin_unlock_bh(&ifp->lock); 2504 read_unlock_bh(&idev->lock); 2505 /* 2506 * If the defice is not ready: 2507 * - keep it tentative if it is a permanent address. 2508 * - otherwise, kill it. 2509 */ 2510 in6_ifa_hold(ifp); 2511 addrconf_dad_stop(ifp); 2512 return; 2513 } 2514 addrconf_dad_kick(ifp); 2515 spin_unlock_bh(&ifp->lock); 2516 out: 2517 read_unlock_bh(&idev->lock); 2518 } 2519 2520 static void addrconf_dad_timer(unsigned long data) 2521 { 2522 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2523 struct inet6_dev *idev = ifp->idev; 2524 struct in6_addr unspec; 2525 struct in6_addr mcaddr; 2526 2527 read_lock_bh(&idev->lock); 2528 if (idev->dead) { 2529 read_unlock_bh(&idev->lock); 2530 goto out; 2531 } 2532 spin_lock_bh(&ifp->lock); 2533 if (ifp->probes == 0) { 2534 /* 2535 * DAD was successful 2536 */ 2537 2538 ifp->flags &= ~IFA_F_TENTATIVE; 2539 spin_unlock_bh(&ifp->lock); 2540 read_unlock_bh(&idev->lock); 2541 2542 addrconf_dad_completed(ifp); 2543 2544 goto out; 2545 } 2546 2547 ifp->probes--; 2548 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2549 spin_unlock_bh(&ifp->lock); 2550 read_unlock_bh(&idev->lock); 2551 2552 /* send a neighbour solicitation for our addr */ 2553 memset(&unspec, 0, sizeof(unspec)); 2554 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2555 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2556 out: 2557 in6_ifa_put(ifp); 2558 } 2559 2560 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2561 { 2562 struct net_device * dev = ifp->idev->dev; 2563 2564 /* 2565 * Configure the address for reception. Now it is valid. 2566 */ 2567 2568 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2569 2570 /* If added prefix is link local and forwarding is off, 2571 start sending router solicitations. 2572 */ 2573 2574 if (ifp->idev->cnf.forwarding == 0 && 2575 ifp->idev->cnf.rtr_solicits > 0 && 2576 (dev->flags&IFF_LOOPBACK) == 0 && 2577 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2578 struct in6_addr all_routers; 2579 2580 ipv6_addr_all_routers(&all_routers); 2581 2582 /* 2583 * If a host as already performed a random delay 2584 * [...] as part of DAD [...] there is no need 2585 * to delay again before sending the first RS 2586 */ 2587 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2588 2589 spin_lock_bh(&ifp->lock); 2590 ifp->probes = 1; 2591 ifp->idev->if_flags |= IF_RS_SENT; 2592 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2593 spin_unlock_bh(&ifp->lock); 2594 } 2595 } 2596 2597 static void addrconf_dad_run(struct inet6_dev *idev) { 2598 struct inet6_ifaddr *ifp; 2599 2600 read_lock_bh(&idev->lock); 2601 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2602 spin_lock_bh(&ifp->lock); 2603 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2604 spin_unlock_bh(&ifp->lock); 2605 continue; 2606 } 2607 spin_unlock_bh(&ifp->lock); 2608 addrconf_dad_kick(ifp); 2609 } 2610 read_unlock_bh(&idev->lock); 2611 } 2612 2613 #ifdef CONFIG_PROC_FS 2614 struct if6_iter_state { 2615 int bucket; 2616 }; 2617 2618 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2619 { 2620 struct inet6_ifaddr *ifa = NULL; 2621 struct if6_iter_state *state = seq->private; 2622 2623 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2624 ifa = inet6_addr_lst[state->bucket]; 2625 if (ifa) 2626 break; 2627 } 2628 return ifa; 2629 } 2630 2631 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2632 { 2633 struct if6_iter_state *state = seq->private; 2634 2635 ifa = ifa->lst_next; 2636 try_again: 2637 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2638 ifa = inet6_addr_lst[state->bucket]; 2639 goto try_again; 2640 } 2641 return ifa; 2642 } 2643 2644 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2645 { 2646 struct inet6_ifaddr *ifa = if6_get_first(seq); 2647 2648 if (ifa) 2649 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2650 --pos; 2651 return pos ? NULL : ifa; 2652 } 2653 2654 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2655 { 2656 read_lock_bh(&addrconf_hash_lock); 2657 return if6_get_idx(seq, *pos); 2658 } 2659 2660 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2661 { 2662 struct inet6_ifaddr *ifa; 2663 2664 ifa = if6_get_next(seq, v); 2665 ++*pos; 2666 return ifa; 2667 } 2668 2669 static void if6_seq_stop(struct seq_file *seq, void *v) 2670 { 2671 read_unlock_bh(&addrconf_hash_lock); 2672 } 2673 2674 static int if6_seq_show(struct seq_file *seq, void *v) 2675 { 2676 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2677 seq_printf(seq, 2678 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2679 NIP6(ifp->addr), 2680 ifp->idev->dev->ifindex, 2681 ifp->prefix_len, 2682 ifp->scope, 2683 ifp->flags, 2684 ifp->idev->dev->name); 2685 return 0; 2686 } 2687 2688 static struct seq_operations if6_seq_ops = { 2689 .start = if6_seq_start, 2690 .next = if6_seq_next, 2691 .show = if6_seq_show, 2692 .stop = if6_seq_stop, 2693 }; 2694 2695 static int if6_seq_open(struct inode *inode, struct file *file) 2696 { 2697 struct seq_file *seq; 2698 int rc = -ENOMEM; 2699 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2700 2701 if (!s) 2702 goto out; 2703 2704 rc = seq_open(file, &if6_seq_ops); 2705 if (rc) 2706 goto out_kfree; 2707 2708 seq = file->private_data; 2709 seq->private = s; 2710 out: 2711 return rc; 2712 out_kfree: 2713 kfree(s); 2714 goto out; 2715 } 2716 2717 static const struct file_operations if6_fops = { 2718 .owner = THIS_MODULE, 2719 .open = if6_seq_open, 2720 .read = seq_read, 2721 .llseek = seq_lseek, 2722 .release = seq_release_private, 2723 }; 2724 2725 int __init if6_proc_init(void) 2726 { 2727 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops)) 2728 return -ENOMEM; 2729 return 0; 2730 } 2731 2732 void if6_proc_exit(void) 2733 { 2734 proc_net_remove("if_inet6"); 2735 } 2736 #endif /* CONFIG_PROC_FS */ 2737 2738 #ifdef CONFIG_IPV6_MIP6 2739 /* Check if address is a home address configured on any interface. */ 2740 int ipv6_chk_home_addr(struct in6_addr *addr) 2741 { 2742 int ret = 0; 2743 struct inet6_ifaddr * ifp; 2744 u8 hash = ipv6_addr_hash(addr); 2745 read_lock_bh(&addrconf_hash_lock); 2746 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2747 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 && 2748 (ifp->flags & IFA_F_HOMEADDRESS)) { 2749 ret = 1; 2750 break; 2751 } 2752 } 2753 read_unlock_bh(&addrconf_hash_lock); 2754 return ret; 2755 } 2756 #endif 2757 2758 /* 2759 * Periodic address status verification 2760 */ 2761 2762 static void addrconf_verify(unsigned long foo) 2763 { 2764 struct inet6_ifaddr *ifp; 2765 unsigned long now, next; 2766 int i; 2767 2768 spin_lock_bh(&addrconf_verify_lock); 2769 now = jiffies; 2770 next = now + ADDR_CHECK_FREQUENCY; 2771 2772 del_timer(&addr_chk_timer); 2773 2774 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2775 2776 restart: 2777 read_lock(&addrconf_hash_lock); 2778 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2779 unsigned long age; 2780 #ifdef CONFIG_IPV6_PRIVACY 2781 unsigned long regen_advance; 2782 #endif 2783 2784 if (ifp->flags & IFA_F_PERMANENT) 2785 continue; 2786 2787 spin_lock(&ifp->lock); 2788 age = (now - ifp->tstamp) / HZ; 2789 2790 #ifdef CONFIG_IPV6_PRIVACY 2791 regen_advance = ifp->idev->cnf.regen_max_retry * 2792 ifp->idev->cnf.dad_transmits * 2793 ifp->idev->nd_parms->retrans_time / HZ; 2794 #endif 2795 2796 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2797 age >= ifp->valid_lft) { 2798 spin_unlock(&ifp->lock); 2799 in6_ifa_hold(ifp); 2800 read_unlock(&addrconf_hash_lock); 2801 ipv6_del_addr(ifp); 2802 goto restart; 2803 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2804 spin_unlock(&ifp->lock); 2805 continue; 2806 } else if (age >= ifp->prefered_lft) { 2807 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2808 int deprecate = 0; 2809 2810 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2811 deprecate = 1; 2812 ifp->flags |= IFA_F_DEPRECATED; 2813 } 2814 2815 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2816 next = ifp->tstamp + ifp->valid_lft * HZ; 2817 2818 spin_unlock(&ifp->lock); 2819 2820 if (deprecate) { 2821 in6_ifa_hold(ifp); 2822 read_unlock(&addrconf_hash_lock); 2823 2824 ipv6_ifa_notify(0, ifp); 2825 in6_ifa_put(ifp); 2826 goto restart; 2827 } 2828 #ifdef CONFIG_IPV6_PRIVACY 2829 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2830 !(ifp->flags&IFA_F_TENTATIVE)) { 2831 if (age >= ifp->prefered_lft - regen_advance) { 2832 struct inet6_ifaddr *ifpub = ifp->ifpub; 2833 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2834 next = ifp->tstamp + ifp->prefered_lft * HZ; 2835 if (!ifp->regen_count && ifpub) { 2836 ifp->regen_count++; 2837 in6_ifa_hold(ifp); 2838 in6_ifa_hold(ifpub); 2839 spin_unlock(&ifp->lock); 2840 read_unlock(&addrconf_hash_lock); 2841 spin_lock(&ifpub->lock); 2842 ifpub->regen_count = 0; 2843 spin_unlock(&ifpub->lock); 2844 ipv6_create_tempaddr(ifpub, ifp); 2845 in6_ifa_put(ifpub); 2846 in6_ifa_put(ifp); 2847 goto restart; 2848 } 2849 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2850 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2851 spin_unlock(&ifp->lock); 2852 #endif 2853 } else { 2854 /* ifp->prefered_lft <= ifp->valid_lft */ 2855 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2856 next = ifp->tstamp + ifp->prefered_lft * HZ; 2857 spin_unlock(&ifp->lock); 2858 } 2859 } 2860 read_unlock(&addrconf_hash_lock); 2861 } 2862 2863 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2864 add_timer(&addr_chk_timer); 2865 spin_unlock_bh(&addrconf_verify_lock); 2866 } 2867 2868 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 2869 { 2870 struct in6_addr *pfx = NULL; 2871 2872 if (addr) 2873 pfx = nla_data(addr); 2874 2875 if (local) { 2876 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 2877 pfx = NULL; 2878 else 2879 pfx = nla_data(local); 2880 } 2881 2882 return pfx; 2883 } 2884 2885 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = { 2886 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 2887 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 2888 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 2889 }; 2890 2891 static int 2892 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2893 { 2894 struct ifaddrmsg *ifm; 2895 struct nlattr *tb[IFA_MAX+1]; 2896 struct in6_addr *pfx; 2897 int err; 2898 2899 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 2900 if (err < 0) 2901 return err; 2902 2903 ifm = nlmsg_data(nlh); 2904 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 2905 if (pfx == NULL) 2906 return -EINVAL; 2907 2908 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 2909 } 2910 2911 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 2912 u32 prefered_lft, u32 valid_lft) 2913 { 2914 u32 flags = RTF_EXPIRES; 2915 2916 if (!valid_lft || (prefered_lft > valid_lft)) 2917 return -EINVAL; 2918 2919 if (valid_lft == INFINITY_LIFE_TIME) { 2920 ifa_flags |= IFA_F_PERMANENT; 2921 flags = 0; 2922 } else if (valid_lft >= 0x7FFFFFFF/HZ) 2923 valid_lft = 0x7FFFFFFF/HZ; 2924 2925 if (prefered_lft == 0) 2926 ifa_flags |= IFA_F_DEPRECATED; 2927 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 2928 (prefered_lft != INFINITY_LIFE_TIME)) 2929 prefered_lft = 0x7FFFFFFF/HZ; 2930 2931 spin_lock_bh(&ifp->lock); 2932 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 2933 ifp->tstamp = jiffies; 2934 ifp->valid_lft = valid_lft; 2935 ifp->prefered_lft = prefered_lft; 2936 2937 spin_unlock_bh(&ifp->lock); 2938 if (!(ifp->flags&IFA_F_TENTATIVE)) 2939 ipv6_ifa_notify(0, ifp); 2940 2941 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 2942 jiffies_to_clock_t(valid_lft * HZ), flags); 2943 addrconf_verify(0); 2944 2945 return 0; 2946 } 2947 2948 static int 2949 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2950 { 2951 struct ifaddrmsg *ifm; 2952 struct nlattr *tb[IFA_MAX+1]; 2953 struct in6_addr *pfx; 2954 struct inet6_ifaddr *ifa; 2955 struct net_device *dev; 2956 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 2957 u8 ifa_flags; 2958 int err; 2959 2960 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 2961 if (err < 0) 2962 return err; 2963 2964 ifm = nlmsg_data(nlh); 2965 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 2966 if (pfx == NULL) 2967 return -EINVAL; 2968 2969 if (tb[IFA_CACHEINFO]) { 2970 struct ifa_cacheinfo *ci; 2971 2972 ci = nla_data(tb[IFA_CACHEINFO]); 2973 valid_lft = ci->ifa_valid; 2974 preferred_lft = ci->ifa_prefered; 2975 } else { 2976 preferred_lft = INFINITY_LIFE_TIME; 2977 valid_lft = INFINITY_LIFE_TIME; 2978 } 2979 2980 dev = __dev_get_by_index(ifm->ifa_index); 2981 if (dev == NULL) 2982 return -ENODEV; 2983 2984 /* We ignore other flags so far. */ 2985 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 2986 2987 ifa = ipv6_get_ifaddr(pfx, dev, 1); 2988 if (ifa == NULL) { 2989 /* 2990 * It would be best to check for !NLM_F_CREATE here but 2991 * userspace alreay relies on not having to provide this. 2992 */ 2993 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 2994 ifa_flags, preferred_lft, valid_lft); 2995 } 2996 2997 if (nlh->nlmsg_flags & NLM_F_EXCL || 2998 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 2999 err = -EEXIST; 3000 else 3001 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3002 3003 in6_ifa_put(ifa); 3004 3005 return err; 3006 } 3007 3008 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3009 u8 scope, int ifindex) 3010 { 3011 struct ifaddrmsg *ifm; 3012 3013 ifm = nlmsg_data(nlh); 3014 ifm->ifa_family = AF_INET6; 3015 ifm->ifa_prefixlen = prefixlen; 3016 ifm->ifa_flags = flags; 3017 ifm->ifa_scope = scope; 3018 ifm->ifa_index = ifindex; 3019 } 3020 3021 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3022 unsigned long tstamp, u32 preferred, u32 valid) 3023 { 3024 struct ifa_cacheinfo ci; 3025 3026 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3027 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3028 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3029 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3030 ci.ifa_prefered = preferred; 3031 ci.ifa_valid = valid; 3032 3033 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3034 } 3035 3036 static inline int rt_scope(int ifa_scope) 3037 { 3038 if (ifa_scope & IFA_HOST) 3039 return RT_SCOPE_HOST; 3040 else if (ifa_scope & IFA_LINK) 3041 return RT_SCOPE_LINK; 3042 else if (ifa_scope & IFA_SITE) 3043 return RT_SCOPE_SITE; 3044 else 3045 return RT_SCOPE_UNIVERSE; 3046 } 3047 3048 static inline int inet6_ifaddr_msgsize(void) 3049 { 3050 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3051 + nla_total_size(16) /* IFA_ADDRESS */ 3052 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3053 } 3054 3055 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3056 u32 pid, u32 seq, int event, unsigned int flags) 3057 { 3058 struct nlmsghdr *nlh; 3059 u32 preferred, valid; 3060 3061 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3062 if (nlh == NULL) 3063 return -EMSGSIZE; 3064 3065 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3066 ifa->idev->dev->ifindex); 3067 3068 if (!(ifa->flags&IFA_F_PERMANENT)) { 3069 preferred = ifa->prefered_lft; 3070 valid = ifa->valid_lft; 3071 if (preferred != INFINITY_LIFE_TIME) { 3072 long tval = (jiffies - ifa->tstamp)/HZ; 3073 preferred -= tval; 3074 if (valid != INFINITY_LIFE_TIME) 3075 valid -= tval; 3076 } 3077 } else { 3078 preferred = INFINITY_LIFE_TIME; 3079 valid = INFINITY_LIFE_TIME; 3080 } 3081 3082 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3083 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3084 nlmsg_cancel(skb, nlh); 3085 return -EMSGSIZE; 3086 } 3087 3088 return nlmsg_end(skb, nlh); 3089 } 3090 3091 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3092 u32 pid, u32 seq, int event, u16 flags) 3093 { 3094 struct nlmsghdr *nlh; 3095 u8 scope = RT_SCOPE_UNIVERSE; 3096 int ifindex = ifmca->idev->dev->ifindex; 3097 3098 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3099 scope = RT_SCOPE_SITE; 3100 3101 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3102 if (nlh == NULL) 3103 return -EMSGSIZE; 3104 3105 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3106 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3107 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3108 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3109 nlmsg_cancel(skb, nlh); 3110 return -EMSGSIZE; 3111 } 3112 3113 return nlmsg_end(skb, nlh); 3114 } 3115 3116 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3117 u32 pid, u32 seq, int event, unsigned int flags) 3118 { 3119 struct nlmsghdr *nlh; 3120 u8 scope = RT_SCOPE_UNIVERSE; 3121 int ifindex = ifaca->aca_idev->dev->ifindex; 3122 3123 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3124 scope = RT_SCOPE_SITE; 3125 3126 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3127 if (nlh == NULL) 3128 return -EMSGSIZE; 3129 3130 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3131 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3132 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3133 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3134 nlmsg_cancel(skb, nlh); 3135 return -EMSGSIZE; 3136 } 3137 3138 return nlmsg_end(skb, nlh); 3139 } 3140 3141 enum addr_type_t 3142 { 3143 UNICAST_ADDR, 3144 MULTICAST_ADDR, 3145 ANYCAST_ADDR, 3146 }; 3147 3148 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3149 enum addr_type_t type) 3150 { 3151 int idx, ip_idx; 3152 int s_idx, s_ip_idx; 3153 int err = 1; 3154 struct net_device *dev; 3155 struct inet6_dev *idev = NULL; 3156 struct inet6_ifaddr *ifa; 3157 struct ifmcaddr6 *ifmca; 3158 struct ifacaddr6 *ifaca; 3159 3160 s_idx = cb->args[0]; 3161 s_ip_idx = ip_idx = cb->args[1]; 3162 read_lock(&dev_base_lock); 3163 3164 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { 3165 if (idx < s_idx) 3166 continue; 3167 if (idx > s_idx) 3168 s_ip_idx = 0; 3169 ip_idx = 0; 3170 if ((idev = in6_dev_get(dev)) == NULL) 3171 continue; 3172 read_lock_bh(&idev->lock); 3173 switch (type) { 3174 case UNICAST_ADDR: 3175 /* unicast address incl. temp addr */ 3176 for (ifa = idev->addr_list; ifa; 3177 ifa = ifa->if_next, ip_idx++) { 3178 if (ip_idx < s_ip_idx) 3179 continue; 3180 if ((err = inet6_fill_ifaddr(skb, ifa, 3181 NETLINK_CB(cb->skb).pid, 3182 cb->nlh->nlmsg_seq, RTM_NEWADDR, 3183 NLM_F_MULTI)) <= 0) 3184 goto done; 3185 } 3186 break; 3187 case MULTICAST_ADDR: 3188 /* multicast address */ 3189 for (ifmca = idev->mc_list; ifmca; 3190 ifmca = ifmca->next, ip_idx++) { 3191 if (ip_idx < s_ip_idx) 3192 continue; 3193 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 3194 NETLINK_CB(cb->skb).pid, 3195 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 3196 NLM_F_MULTI)) <= 0) 3197 goto done; 3198 } 3199 break; 3200 case ANYCAST_ADDR: 3201 /* anycast address */ 3202 for (ifaca = idev->ac_list; ifaca; 3203 ifaca = ifaca->aca_next, ip_idx++) { 3204 if (ip_idx < s_ip_idx) 3205 continue; 3206 if ((err = inet6_fill_ifacaddr(skb, ifaca, 3207 NETLINK_CB(cb->skb).pid, 3208 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 3209 NLM_F_MULTI)) <= 0) 3210 goto done; 3211 } 3212 break; 3213 default: 3214 break; 3215 } 3216 read_unlock_bh(&idev->lock); 3217 in6_dev_put(idev); 3218 } 3219 done: 3220 if (err <= 0) { 3221 read_unlock_bh(&idev->lock); 3222 in6_dev_put(idev); 3223 } 3224 read_unlock(&dev_base_lock); 3225 cb->args[0] = idx; 3226 cb->args[1] = ip_idx; 3227 return skb->len; 3228 } 3229 3230 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3231 { 3232 enum addr_type_t type = UNICAST_ADDR; 3233 return inet6_dump_addr(skb, cb, type); 3234 } 3235 3236 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3237 { 3238 enum addr_type_t type = MULTICAST_ADDR; 3239 return inet6_dump_addr(skb, cb, type); 3240 } 3241 3242 3243 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3244 { 3245 enum addr_type_t type = ANYCAST_ADDR; 3246 return inet6_dump_addr(skb, cb, type); 3247 } 3248 3249 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3250 void *arg) 3251 { 3252 struct ifaddrmsg *ifm; 3253 struct nlattr *tb[IFA_MAX+1]; 3254 struct in6_addr *addr = NULL; 3255 struct net_device *dev = NULL; 3256 struct inet6_ifaddr *ifa; 3257 struct sk_buff *skb; 3258 int err; 3259 3260 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3261 if (err < 0) 3262 goto errout; 3263 3264 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3265 if (addr == NULL) { 3266 err = -EINVAL; 3267 goto errout; 3268 } 3269 3270 ifm = nlmsg_data(nlh); 3271 if (ifm->ifa_index) 3272 dev = __dev_get_by_index(ifm->ifa_index); 3273 3274 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) { 3275 err = -EADDRNOTAVAIL; 3276 goto errout; 3277 } 3278 3279 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3280 err = -ENOBUFS; 3281 goto errout_ifa; 3282 } 3283 3284 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3285 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3286 if (err < 0) { 3287 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3288 WARN_ON(err == -EMSGSIZE); 3289 kfree_skb(skb); 3290 goto errout_ifa; 3291 } 3292 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); 3293 errout_ifa: 3294 in6_ifa_put(ifa); 3295 errout: 3296 return err; 3297 } 3298 3299 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3300 { 3301 struct sk_buff *skb; 3302 int err = -ENOBUFS; 3303 3304 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3305 if (skb == NULL) 3306 goto errout; 3307 3308 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3309 if (err < 0) { 3310 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3311 WARN_ON(err == -EMSGSIZE); 3312 kfree_skb(skb); 3313 goto errout; 3314 } 3315 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3316 errout: 3317 if (err < 0) 3318 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3319 } 3320 3321 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf, 3322 __s32 *array, int bytes) 3323 { 3324 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3325 3326 memset(array, 0, bytes); 3327 array[DEVCONF_FORWARDING] = cnf->forwarding; 3328 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3329 array[DEVCONF_MTU6] = cnf->mtu6; 3330 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3331 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3332 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3333 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3334 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3335 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3336 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3337 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3338 #ifdef CONFIG_IPV6_PRIVACY 3339 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3340 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3341 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3342 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3343 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3344 #endif 3345 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3346 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3347 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3348 #ifdef CONFIG_IPV6_ROUTER_PREF 3349 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3350 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3351 #ifdef CONFIG_IPV6_ROUTE_INFO 3352 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3353 #endif 3354 #endif 3355 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3356 } 3357 3358 static inline size_t inet6_if_nlmsg_size(void) 3359 { 3360 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3361 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3362 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3363 + nla_total_size(4) /* IFLA_MTU */ 3364 + nla_total_size(4) /* IFLA_LINK */ 3365 + nla_total_size( /* IFLA_PROTINFO */ 3366 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3367 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3368 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3369 ); 3370 } 3371 3372 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3373 u32 pid, u32 seq, int event, unsigned int flags) 3374 { 3375 struct net_device *dev = idev->dev; 3376 struct nlattr *conf; 3377 struct ifinfomsg *hdr; 3378 struct nlmsghdr *nlh; 3379 void *protoinfo; 3380 struct ifla_cacheinfo ci; 3381 3382 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3383 if (nlh == NULL) 3384 return -EMSGSIZE; 3385 3386 hdr = nlmsg_data(nlh); 3387 hdr->ifi_family = AF_INET6; 3388 hdr->__ifi_pad = 0; 3389 hdr->ifi_type = dev->type; 3390 hdr->ifi_index = dev->ifindex; 3391 hdr->ifi_flags = dev_get_flags(dev); 3392 hdr->ifi_change = 0; 3393 3394 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3395 3396 if (dev->addr_len) 3397 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3398 3399 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3400 if (dev->ifindex != dev->iflink) 3401 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3402 3403 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3404 if (protoinfo == NULL) 3405 goto nla_put_failure; 3406 3407 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3408 3409 ci.max_reasm_len = IPV6_MAXPLEN; 3410 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3411 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3412 ci.reachable_time = idev->nd_parms->reachable_time; 3413 ci.retrans_time = idev->nd_parms->retrans_time; 3414 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3415 3416 conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3417 if (conf == NULL) 3418 goto nla_put_failure; 3419 ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf)); 3420 3421 /* XXX - Statistics/MC not implemented */ 3422 3423 nla_nest_end(skb, protoinfo); 3424 return nlmsg_end(skb, nlh); 3425 3426 nla_put_failure: 3427 nlmsg_cancel(skb, nlh); 3428 return -EMSGSIZE; 3429 } 3430 3431 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3432 { 3433 int idx, err; 3434 int s_idx = cb->args[0]; 3435 struct net_device *dev; 3436 struct inet6_dev *idev; 3437 3438 read_lock(&dev_base_lock); 3439 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { 3440 if (idx < s_idx) 3441 continue; 3442 if ((idev = in6_dev_get(dev)) == NULL) 3443 continue; 3444 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3445 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3446 in6_dev_put(idev); 3447 if (err <= 0) 3448 break; 3449 } 3450 read_unlock(&dev_base_lock); 3451 cb->args[0] = idx; 3452 3453 return skb->len; 3454 } 3455 3456 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3457 { 3458 struct sk_buff *skb; 3459 int err = -ENOBUFS; 3460 3461 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3462 if (skb == NULL) 3463 goto errout; 3464 3465 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3466 if (err < 0) { 3467 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3468 WARN_ON(err == -EMSGSIZE); 3469 kfree_skb(skb); 3470 goto errout; 3471 } 3472 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3473 errout: 3474 if (err < 0) 3475 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3476 } 3477 3478 static inline size_t inet6_prefix_nlmsg_size(void) 3479 { 3480 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3481 + nla_total_size(sizeof(struct in6_addr)) 3482 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3483 } 3484 3485 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3486 struct prefix_info *pinfo, u32 pid, u32 seq, 3487 int event, unsigned int flags) 3488 { 3489 struct prefixmsg *pmsg; 3490 struct nlmsghdr *nlh; 3491 struct prefix_cacheinfo ci; 3492 3493 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3494 if (nlh == NULL) 3495 return -EMSGSIZE; 3496 3497 pmsg = nlmsg_data(nlh); 3498 pmsg->prefix_family = AF_INET6; 3499 pmsg->prefix_pad1 = 0; 3500 pmsg->prefix_pad2 = 0; 3501 pmsg->prefix_ifindex = idev->dev->ifindex; 3502 pmsg->prefix_len = pinfo->prefix_len; 3503 pmsg->prefix_type = pinfo->type; 3504 pmsg->prefix_pad3 = 0; 3505 pmsg->prefix_flags = 0; 3506 if (pinfo->onlink) 3507 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3508 if (pinfo->autoconf) 3509 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3510 3511 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3512 3513 ci.preferred_time = ntohl(pinfo->prefered); 3514 ci.valid_time = ntohl(pinfo->valid); 3515 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3516 3517 return nlmsg_end(skb, nlh); 3518 3519 nla_put_failure: 3520 nlmsg_cancel(skb, nlh); 3521 return -EMSGSIZE; 3522 } 3523 3524 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3525 struct prefix_info *pinfo) 3526 { 3527 struct sk_buff *skb; 3528 int err = -ENOBUFS; 3529 3530 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3531 if (skb == NULL) 3532 goto errout; 3533 3534 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3535 if (err < 0) { 3536 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3537 WARN_ON(err == -EMSGSIZE); 3538 kfree_skb(skb); 3539 goto errout; 3540 } 3541 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3542 errout: 3543 if (err < 0) 3544 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err); 3545 } 3546 3547 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = { 3548 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, }, 3549 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, }, 3550 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, }, 3551 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr, 3552 .dumpit = inet6_dump_ifaddr, }, 3553 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, }, 3554 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, }, 3555 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, }, 3556 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, }, 3557 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute, 3558 .dumpit = inet6_dump_fib, }, 3559 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3560 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, }, 3561 #endif 3562 }; 3563 3564 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3565 { 3566 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3567 3568 switch (event) { 3569 case RTM_NEWADDR: 3570 ip6_ins_rt(ifp->rt); 3571 if (ifp->idev->cnf.forwarding) 3572 addrconf_join_anycast(ifp); 3573 break; 3574 case RTM_DELADDR: 3575 if (ifp->idev->cnf.forwarding) 3576 addrconf_leave_anycast(ifp); 3577 addrconf_leave_solict(ifp->idev, &ifp->addr); 3578 dst_hold(&ifp->rt->u.dst); 3579 if (ip6_del_rt(ifp->rt)) 3580 dst_free(&ifp->rt->u.dst); 3581 break; 3582 } 3583 } 3584 3585 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3586 { 3587 rcu_read_lock_bh(); 3588 if (likely(ifp->idev->dead == 0)) 3589 __ipv6_ifa_notify(event, ifp); 3590 rcu_read_unlock_bh(); 3591 } 3592 3593 #ifdef CONFIG_SYSCTL 3594 3595 static 3596 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3597 void __user *buffer, size_t *lenp, loff_t *ppos) 3598 { 3599 int *valp = ctl->data; 3600 int val = *valp; 3601 int ret; 3602 3603 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3604 3605 if (write && valp != &ipv6_devconf_dflt.forwarding) { 3606 if (valp != &ipv6_devconf.forwarding) { 3607 if ((!*valp) ^ (!val)) { 3608 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 3609 if (idev == NULL) 3610 return ret; 3611 dev_forward_change(idev); 3612 } 3613 } else { 3614 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; 3615 addrconf_forward_change(); 3616 } 3617 if (*valp) 3618 rt6_purge_dflt_routers(); 3619 } 3620 3621 return ret; 3622 } 3623 3624 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3625 int __user *name, int nlen, 3626 void __user *oldval, 3627 size_t __user *oldlenp, 3628 void __user *newval, size_t newlen) 3629 { 3630 int *valp = table->data; 3631 int new; 3632 3633 if (!newval || !newlen) 3634 return 0; 3635 if (newlen != sizeof(int)) 3636 return -EINVAL; 3637 if (get_user(new, (int __user *)newval)) 3638 return -EFAULT; 3639 if (new == *valp) 3640 return 0; 3641 if (oldval && oldlenp) { 3642 size_t len; 3643 if (get_user(len, oldlenp)) 3644 return -EFAULT; 3645 if (len) { 3646 if (len > table->maxlen) 3647 len = table->maxlen; 3648 if (copy_to_user(oldval, valp, len)) 3649 return -EFAULT; 3650 if (put_user(len, oldlenp)) 3651 return -EFAULT; 3652 } 3653 } 3654 3655 if (valp != &ipv6_devconf_dflt.forwarding) { 3656 if (valp != &ipv6_devconf.forwarding) { 3657 struct inet6_dev *idev = (struct inet6_dev *)table->extra1; 3658 int changed; 3659 if (unlikely(idev == NULL)) 3660 return -ENODEV; 3661 changed = (!*valp) ^ (!new); 3662 *valp = new; 3663 if (changed) 3664 dev_forward_change(idev); 3665 } else { 3666 *valp = new; 3667 addrconf_forward_change(); 3668 } 3669 3670 if (*valp) 3671 rt6_purge_dflt_routers(); 3672 } else 3673 *valp = new; 3674 3675 return 1; 3676 } 3677 3678 static struct addrconf_sysctl_table 3679 { 3680 struct ctl_table_header *sysctl_header; 3681 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3682 ctl_table addrconf_dev[2]; 3683 ctl_table addrconf_conf_dir[2]; 3684 ctl_table addrconf_proto_dir[2]; 3685 ctl_table addrconf_root_dir[2]; 3686 } addrconf_sysctl __read_mostly = { 3687 .sysctl_header = NULL, 3688 .addrconf_vars = { 3689 { 3690 .ctl_name = NET_IPV6_FORWARDING, 3691 .procname = "forwarding", 3692 .data = &ipv6_devconf.forwarding, 3693 .maxlen = sizeof(int), 3694 .mode = 0644, 3695 .proc_handler = &addrconf_sysctl_forward, 3696 .strategy = &addrconf_sysctl_forward_strategy, 3697 }, 3698 { 3699 .ctl_name = NET_IPV6_HOP_LIMIT, 3700 .procname = "hop_limit", 3701 .data = &ipv6_devconf.hop_limit, 3702 .maxlen = sizeof(int), 3703 .mode = 0644, 3704 .proc_handler = proc_dointvec, 3705 }, 3706 { 3707 .ctl_name = NET_IPV6_MTU, 3708 .procname = "mtu", 3709 .data = &ipv6_devconf.mtu6, 3710 .maxlen = sizeof(int), 3711 .mode = 0644, 3712 .proc_handler = &proc_dointvec, 3713 }, 3714 { 3715 .ctl_name = NET_IPV6_ACCEPT_RA, 3716 .procname = "accept_ra", 3717 .data = &ipv6_devconf.accept_ra, 3718 .maxlen = sizeof(int), 3719 .mode = 0644, 3720 .proc_handler = &proc_dointvec, 3721 }, 3722 { 3723 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3724 .procname = "accept_redirects", 3725 .data = &ipv6_devconf.accept_redirects, 3726 .maxlen = sizeof(int), 3727 .mode = 0644, 3728 .proc_handler = &proc_dointvec, 3729 }, 3730 { 3731 .ctl_name = NET_IPV6_AUTOCONF, 3732 .procname = "autoconf", 3733 .data = &ipv6_devconf.autoconf, 3734 .maxlen = sizeof(int), 3735 .mode = 0644, 3736 .proc_handler = &proc_dointvec, 3737 }, 3738 { 3739 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3740 .procname = "dad_transmits", 3741 .data = &ipv6_devconf.dad_transmits, 3742 .maxlen = sizeof(int), 3743 .mode = 0644, 3744 .proc_handler = &proc_dointvec, 3745 }, 3746 { 3747 .ctl_name = NET_IPV6_RTR_SOLICITS, 3748 .procname = "router_solicitations", 3749 .data = &ipv6_devconf.rtr_solicits, 3750 .maxlen = sizeof(int), 3751 .mode = 0644, 3752 .proc_handler = &proc_dointvec, 3753 }, 3754 { 3755 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3756 .procname = "router_solicitation_interval", 3757 .data = &ipv6_devconf.rtr_solicit_interval, 3758 .maxlen = sizeof(int), 3759 .mode = 0644, 3760 .proc_handler = &proc_dointvec_jiffies, 3761 .strategy = &sysctl_jiffies, 3762 }, 3763 { 3764 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3765 .procname = "router_solicitation_delay", 3766 .data = &ipv6_devconf.rtr_solicit_delay, 3767 .maxlen = sizeof(int), 3768 .mode = 0644, 3769 .proc_handler = &proc_dointvec_jiffies, 3770 .strategy = &sysctl_jiffies, 3771 }, 3772 { 3773 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3774 .procname = "force_mld_version", 3775 .data = &ipv6_devconf.force_mld_version, 3776 .maxlen = sizeof(int), 3777 .mode = 0644, 3778 .proc_handler = &proc_dointvec, 3779 }, 3780 #ifdef CONFIG_IPV6_PRIVACY 3781 { 3782 .ctl_name = NET_IPV6_USE_TEMPADDR, 3783 .procname = "use_tempaddr", 3784 .data = &ipv6_devconf.use_tempaddr, 3785 .maxlen = sizeof(int), 3786 .mode = 0644, 3787 .proc_handler = &proc_dointvec, 3788 }, 3789 { 3790 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3791 .procname = "temp_valid_lft", 3792 .data = &ipv6_devconf.temp_valid_lft, 3793 .maxlen = sizeof(int), 3794 .mode = 0644, 3795 .proc_handler = &proc_dointvec, 3796 }, 3797 { 3798 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3799 .procname = "temp_prefered_lft", 3800 .data = &ipv6_devconf.temp_prefered_lft, 3801 .maxlen = sizeof(int), 3802 .mode = 0644, 3803 .proc_handler = &proc_dointvec, 3804 }, 3805 { 3806 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3807 .procname = "regen_max_retry", 3808 .data = &ipv6_devconf.regen_max_retry, 3809 .maxlen = sizeof(int), 3810 .mode = 0644, 3811 .proc_handler = &proc_dointvec, 3812 }, 3813 { 3814 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3815 .procname = "max_desync_factor", 3816 .data = &ipv6_devconf.max_desync_factor, 3817 .maxlen = sizeof(int), 3818 .mode = 0644, 3819 .proc_handler = &proc_dointvec, 3820 }, 3821 #endif 3822 { 3823 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3824 .procname = "max_addresses", 3825 .data = &ipv6_devconf.max_addresses, 3826 .maxlen = sizeof(int), 3827 .mode = 0644, 3828 .proc_handler = &proc_dointvec, 3829 }, 3830 { 3831 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 3832 .procname = "accept_ra_defrtr", 3833 .data = &ipv6_devconf.accept_ra_defrtr, 3834 .maxlen = sizeof(int), 3835 .mode = 0644, 3836 .proc_handler = &proc_dointvec, 3837 }, 3838 { 3839 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 3840 .procname = "accept_ra_pinfo", 3841 .data = &ipv6_devconf.accept_ra_pinfo, 3842 .maxlen = sizeof(int), 3843 .mode = 0644, 3844 .proc_handler = &proc_dointvec, 3845 }, 3846 #ifdef CONFIG_IPV6_ROUTER_PREF 3847 { 3848 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 3849 .procname = "accept_ra_rtr_pref", 3850 .data = &ipv6_devconf.accept_ra_rtr_pref, 3851 .maxlen = sizeof(int), 3852 .mode = 0644, 3853 .proc_handler = &proc_dointvec, 3854 }, 3855 { 3856 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 3857 .procname = "router_probe_interval", 3858 .data = &ipv6_devconf.rtr_probe_interval, 3859 .maxlen = sizeof(int), 3860 .mode = 0644, 3861 .proc_handler = &proc_dointvec_jiffies, 3862 .strategy = &sysctl_jiffies, 3863 }, 3864 #ifdef CONFIG_IPV6_ROUTE_INFO 3865 { 3866 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 3867 .procname = "accept_ra_rt_info_max_plen", 3868 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 3869 .maxlen = sizeof(int), 3870 .mode = 0644, 3871 .proc_handler = &proc_dointvec, 3872 }, 3873 #endif 3874 #endif 3875 { 3876 .ctl_name = NET_IPV6_PROXY_NDP, 3877 .procname = "proxy_ndp", 3878 .data = &ipv6_devconf.proxy_ndp, 3879 .maxlen = sizeof(int), 3880 .mode = 0644, 3881 .proc_handler = &proc_dointvec, 3882 }, 3883 { 3884 .ctl_name = 0, /* sentinel */ 3885 } 3886 }, 3887 .addrconf_dev = { 3888 { 3889 .ctl_name = NET_PROTO_CONF_ALL, 3890 .procname = "all", 3891 .mode = 0555, 3892 .child = addrconf_sysctl.addrconf_vars, 3893 }, 3894 { 3895 .ctl_name = 0, /* sentinel */ 3896 } 3897 }, 3898 .addrconf_conf_dir = { 3899 { 3900 .ctl_name = NET_IPV6_CONF, 3901 .procname = "conf", 3902 .mode = 0555, 3903 .child = addrconf_sysctl.addrconf_dev, 3904 }, 3905 { 3906 .ctl_name = 0, /* sentinel */ 3907 } 3908 }, 3909 .addrconf_proto_dir = { 3910 { 3911 .ctl_name = NET_IPV6, 3912 .procname = "ipv6", 3913 .mode = 0555, 3914 .child = addrconf_sysctl.addrconf_conf_dir, 3915 }, 3916 { 3917 .ctl_name = 0, /* sentinel */ 3918 } 3919 }, 3920 .addrconf_root_dir = { 3921 { 3922 .ctl_name = CTL_NET, 3923 .procname = "net", 3924 .mode = 0555, 3925 .child = addrconf_sysctl.addrconf_proto_dir, 3926 }, 3927 { 3928 .ctl_name = 0, /* sentinel */ 3929 } 3930 }, 3931 }; 3932 3933 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) 3934 { 3935 int i; 3936 struct net_device *dev = idev ? idev->dev : NULL; 3937 struct addrconf_sysctl_table *t; 3938 char *dev_name = NULL; 3939 3940 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 3941 if (t == NULL) 3942 return; 3943 for (i=0; t->addrconf_vars[i].data; i++) { 3944 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 3945 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 3946 } 3947 if (dev) { 3948 dev_name = dev->name; 3949 t->addrconf_dev[0].ctl_name = dev->ifindex; 3950 } else { 3951 dev_name = "default"; 3952 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 3953 } 3954 3955 /* 3956 * Make a copy of dev_name, because '.procname' is regarded as const 3957 * by sysctl and we wouldn't want anyone to change it under our feet 3958 * (see SIOCSIFNAME). 3959 */ 3960 dev_name = kstrdup(dev_name, GFP_KERNEL); 3961 if (!dev_name) 3962 goto free; 3963 3964 t->addrconf_dev[0].procname = dev_name; 3965 3966 t->addrconf_dev[0].child = t->addrconf_vars; 3967 t->addrconf_conf_dir[0].child = t->addrconf_dev; 3968 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; 3969 t->addrconf_root_dir[0].child = t->addrconf_proto_dir; 3970 3971 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir); 3972 if (t->sysctl_header == NULL) 3973 goto free_procname; 3974 else 3975 p->sysctl = t; 3976 return; 3977 3978 /* error path */ 3979 free_procname: 3980 kfree(dev_name); 3981 free: 3982 kfree(t); 3983 3984 return; 3985 } 3986 3987 static void addrconf_sysctl_unregister(struct ipv6_devconf *p) 3988 { 3989 if (p->sysctl) { 3990 struct addrconf_sysctl_table *t = p->sysctl; 3991 p->sysctl = NULL; 3992 unregister_sysctl_table(t->sysctl_header); 3993 kfree(t->addrconf_dev[0].procname); 3994 kfree(t); 3995 } 3996 } 3997 3998 3999 #endif 4000 4001 /* 4002 * Device notifier 4003 */ 4004 4005 int register_inet6addr_notifier(struct notifier_block *nb) 4006 { 4007 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4008 } 4009 4010 int unregister_inet6addr_notifier(struct notifier_block *nb) 4011 { 4012 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4013 } 4014 4015 /* 4016 * Init / cleanup code 4017 */ 4018 4019 int __init addrconf_init(void) 4020 { 4021 int err = 0; 4022 4023 /* The addrconf netdev notifier requires that loopback_dev 4024 * has it's ipv6 private information allocated and setup 4025 * before it can bring up and give link-local addresses 4026 * to other devices which are up. 4027 * 4028 * Unfortunately, loopback_dev is not necessarily the first 4029 * entry in the global dev_base list of net devices. In fact, 4030 * it is likely to be the very last entry on that list. 4031 * So this causes the notifier registry below to try and 4032 * give link-local addresses to all devices besides loopback_dev 4033 * first, then loopback_dev, which cases all the non-loopback_dev 4034 * devices to fail to get a link-local address. 4035 * 4036 * So, as a temporary fix, allocate the ipv6 structure for 4037 * loopback_dev first by hand. 4038 * Longer term, all of the dependencies ipv6 has upon the loopback 4039 * device and it being up should be removed. 4040 */ 4041 rtnl_lock(); 4042 if (!ipv6_add_dev(&loopback_dev)) 4043 err = -ENOMEM; 4044 rtnl_unlock(); 4045 if (err) 4046 return err; 4047 4048 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev); 4049 4050 register_netdevice_notifier(&ipv6_dev_notf); 4051 4052 addrconf_verify(0); 4053 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table; 4054 #ifdef CONFIG_SYSCTL 4055 addrconf_sysctl.sysctl_header = 4056 register_sysctl_table(addrconf_sysctl.addrconf_root_dir); 4057 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); 4058 #endif 4059 4060 return 0; 4061 } 4062 4063 void __exit addrconf_cleanup(void) 4064 { 4065 struct net_device *dev; 4066 struct inet6_dev *idev; 4067 struct inet6_ifaddr *ifa; 4068 int i; 4069 4070 unregister_netdevice_notifier(&ipv6_dev_notf); 4071 4072 rtnetlink_links[PF_INET6] = NULL; 4073 #ifdef CONFIG_SYSCTL 4074 addrconf_sysctl_unregister(&ipv6_devconf_dflt); 4075 addrconf_sysctl_unregister(&ipv6_devconf); 4076 #endif 4077 4078 rtnl_lock(); 4079 4080 /* 4081 * clean dev list. 4082 */ 4083 4084 for (dev=dev_base; dev; dev=dev->next) { 4085 if ((idev = __in6_dev_get(dev)) == NULL) 4086 continue; 4087 addrconf_ifdown(dev, 1); 4088 } 4089 addrconf_ifdown(&loopback_dev, 2); 4090 4091 /* 4092 * Check hash table. 4093 */ 4094 4095 write_lock_bh(&addrconf_hash_lock); 4096 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4097 for (ifa=inet6_addr_lst[i]; ifa; ) { 4098 struct inet6_ifaddr *bifa; 4099 4100 bifa = ifa; 4101 ifa = ifa->lst_next; 4102 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4103 /* Do not free it; something is wrong. 4104 Now we can investigate it with debugger. 4105 */ 4106 } 4107 } 4108 write_unlock_bh(&addrconf_hash_lock); 4109 4110 del_timer(&addr_chk_timer); 4111 4112 rtnl_unlock(); 4113 4114 #ifdef CONFIG_PROC_FS 4115 proc_net_remove("if_inet6"); 4116 #endif 4117 } 4118