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