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/sched.h> 48 #include <linux/net.h> 49 #include <linux/in6.h> 50 #include <linux/netdevice.h> 51 #include <linux/if_addr.h> 52 #include <linux/if_arp.h> 53 #include <linux/if_arcnet.h> 54 #include <linux/if_infiniband.h> 55 #include <linux/route.h> 56 #include <linux/inetdevice.h> 57 #include <linux/init.h> 58 #ifdef CONFIG_SYSCTL 59 #include <linux/sysctl.h> 60 #endif 61 #include <linux/capability.h> 62 #include <linux/delay.h> 63 #include <linux/notifier.h> 64 #include <linux/string.h> 65 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 <linux/if_tunnel.h> 78 #include <linux/rtnetlink.h> 79 80 #ifdef CONFIG_IPV6_PRIVACY 81 #include <linux/random.h> 82 #endif 83 84 #include <asm/uaccess.h> 85 86 #include <linux/proc_fs.h> 87 #include <linux/seq_file.h> 88 89 /* Set to 3 to get tracing... */ 90 #define ACONF_DEBUG 2 91 92 #if ACONF_DEBUG >= 3 93 #define ADBG(x) printk x 94 #else 95 #define ADBG(x) 96 #endif 97 98 #define INFINITY_LIFE_TIME 0xFFFFFFFF 99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 100 101 #ifdef CONFIG_SYSCTL 102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p); 103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p); 104 #endif 105 106 #ifdef CONFIG_IPV6_PRIVACY 107 static int __ipv6_regen_rndid(struct inet6_dev *idev); 108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 109 static void ipv6_regen_rndid(unsigned long data); 110 111 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 112 #endif 113 114 static int ipv6_count_addresses(struct inet6_dev *idev); 115 116 /* 117 * Configured unicast address hash table 118 */ 119 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 120 static DEFINE_RWLOCK(addrconf_hash_lock); 121 122 static void addrconf_verify(unsigned long); 123 124 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 125 static DEFINE_SPINLOCK(addrconf_verify_lock); 126 127 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 128 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 129 130 static int addrconf_ifdown(struct net_device *dev, int how); 131 132 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 133 static void addrconf_dad_timer(unsigned long data); 134 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 135 static void addrconf_dad_run(struct inet6_dev *idev); 136 static void addrconf_rs_timer(unsigned long data); 137 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 139 140 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 141 struct prefix_info *pinfo); 142 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); 143 144 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 145 146 struct ipv6_devconf ipv6_devconf __read_mostly = { 147 .forwarding = 0, 148 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 149 .mtu6 = IPV6_MIN_MTU, 150 .accept_ra = 1, 151 .accept_redirects = 1, 152 .autoconf = 1, 153 .force_mld_version = 0, 154 .dad_transmits = 1, 155 .rtr_solicits = MAX_RTR_SOLICITATIONS, 156 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 157 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 158 #ifdef CONFIG_IPV6_PRIVACY 159 .use_tempaddr = 0, 160 .temp_valid_lft = TEMP_VALID_LIFETIME, 161 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 162 .regen_max_retry = REGEN_MAX_RETRY, 163 .max_desync_factor = MAX_DESYNC_FACTOR, 164 #endif 165 .max_addresses = IPV6_MAX_ADDRESSES, 166 .accept_ra_defrtr = 1, 167 .accept_ra_pinfo = 1, 168 #ifdef CONFIG_IPV6_ROUTER_PREF 169 .accept_ra_rtr_pref = 1, 170 .rtr_probe_interval = 60 * HZ, 171 #ifdef CONFIG_IPV6_ROUTE_INFO 172 .accept_ra_rt_info_max_plen = 0, 173 #endif 174 #endif 175 .proxy_ndp = 0, 176 }; 177 178 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 179 .forwarding = 0, 180 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 181 .mtu6 = IPV6_MIN_MTU, 182 .accept_ra = 1, 183 .accept_redirects = 1, 184 .autoconf = 1, 185 .dad_transmits = 1, 186 .rtr_solicits = MAX_RTR_SOLICITATIONS, 187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 189 #ifdef CONFIG_IPV6_PRIVACY 190 .use_tempaddr = 0, 191 .temp_valid_lft = TEMP_VALID_LIFETIME, 192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 193 .regen_max_retry = REGEN_MAX_RETRY, 194 .max_desync_factor = MAX_DESYNC_FACTOR, 195 #endif 196 .max_addresses = IPV6_MAX_ADDRESSES, 197 .accept_ra_defrtr = 1, 198 .accept_ra_pinfo = 1, 199 #ifdef CONFIG_IPV6_ROUTER_PREF 200 .accept_ra_rtr_pref = 1, 201 .rtr_probe_interval = 60 * HZ, 202 #ifdef CONFIG_IPV6_ROUTE_INFO 203 .accept_ra_rt_info_max_plen = 0, 204 #endif 205 #endif 206 .proxy_ndp = 0, 207 }; 208 209 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 210 #if 0 211 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 212 #endif 213 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 214 215 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16) 216 217 static inline unsigned ipv6_addr_scope2type(unsigned scope) 218 { 219 switch(scope) { 220 case IPV6_ADDR_SCOPE_NODELOCAL: 221 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) | 222 IPV6_ADDR_LOOPBACK); 223 case IPV6_ADDR_SCOPE_LINKLOCAL: 224 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) | 225 IPV6_ADDR_LINKLOCAL); 226 case IPV6_ADDR_SCOPE_SITELOCAL: 227 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) | 228 IPV6_ADDR_SITELOCAL); 229 } 230 return IPV6_ADDR_SCOPE_TYPE(scope); 231 } 232 233 int __ipv6_addr_type(const struct in6_addr *addr) 234 { 235 __be32 st; 236 237 st = addr->s6_addr32[0]; 238 239 /* Consider all addresses with the first three bits different of 240 000 and 111 as unicasts. 241 */ 242 if ((st & htonl(0xE0000000)) != htonl(0x00000000) && 243 (st & htonl(0xE0000000)) != htonl(0xE0000000)) 244 return (IPV6_ADDR_UNICAST | 245 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); 246 247 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) { 248 /* multicast */ 249 /* addr-select 3.1 */ 250 return (IPV6_ADDR_MULTICAST | 251 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr))); 252 } 253 254 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000)) 255 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 256 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */ 257 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000)) 258 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST | 259 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */ 260 261 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) { 262 if (addr->s6_addr32[2] == 0) { 263 if (addr->s6_addr32[3] == 0) 264 return IPV6_ADDR_ANY; 265 266 if (addr->s6_addr32[3] == htonl(0x00000001)) 267 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST | 268 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */ 269 270 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST | 271 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 272 } 273 274 if (addr->s6_addr32[2] == htonl(0x0000ffff)) 275 return (IPV6_ADDR_MAPPED | 276 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 277 } 278 279 return (IPV6_ADDR_RESERVED | 280 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */ 281 } 282 283 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 284 { 285 if (del_timer(&ifp->timer)) 286 __in6_ifa_put(ifp); 287 } 288 289 enum addrconf_timer_t 290 { 291 AC_NONE, 292 AC_DAD, 293 AC_RS, 294 }; 295 296 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 297 enum addrconf_timer_t what, 298 unsigned long when) 299 { 300 if (!del_timer(&ifp->timer)) 301 in6_ifa_hold(ifp); 302 303 switch (what) { 304 case AC_DAD: 305 ifp->timer.function = addrconf_dad_timer; 306 break; 307 case AC_RS: 308 ifp->timer.function = addrconf_rs_timer; 309 break; 310 default:; 311 } 312 ifp->timer.expires = jiffies + when; 313 add_timer(&ifp->timer); 314 } 315 316 /* Nobody refers to this device, we may destroy it. */ 317 318 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 319 { 320 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 321 kfree(idev); 322 } 323 324 void in6_dev_finish_destroy(struct inet6_dev *idev) 325 { 326 struct net_device *dev = idev->dev; 327 BUG_TRAP(idev->addr_list==NULL); 328 BUG_TRAP(idev->mc_list==NULL); 329 #ifdef NET_REFCNT_DEBUG 330 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 331 #endif 332 dev_put(dev); 333 if (!idev->dead) { 334 printk("Freeing alive inet6 device %p\n", idev); 335 return; 336 } 337 snmp6_free_dev(idev); 338 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 339 } 340 341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 342 { 343 struct inet6_dev *ndev; 344 345 ASSERT_RTNL(); 346 347 if (dev->mtu < IPV6_MIN_MTU) 348 return NULL; 349 350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 351 352 if (ndev == NULL) 353 return NULL; 354 355 rwlock_init(&ndev->lock); 356 ndev->dev = dev; 357 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf)); 358 ndev->cnf.mtu6 = dev->mtu; 359 ndev->cnf.sysctl = NULL; 360 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 361 if (ndev->nd_parms == NULL) { 362 kfree(ndev); 363 return NULL; 364 } 365 /* We refer to the device */ 366 dev_hold(dev); 367 368 if (snmp6_alloc_dev(ndev) < 0) { 369 ADBG((KERN_WARNING 370 "%s(): cannot allocate memory for statistics; dev=%s.\n", 371 __FUNCTION__, dev->name)); 372 neigh_parms_release(&nd_tbl, ndev->nd_parms); 373 ndev->dead = 1; 374 in6_dev_finish_destroy(ndev); 375 return NULL; 376 } 377 378 if (snmp6_register_dev(ndev) < 0) { 379 ADBG((KERN_WARNING 380 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 381 __FUNCTION__, dev->name)); 382 neigh_parms_release(&nd_tbl, ndev->nd_parms); 383 ndev->dead = 1; 384 in6_dev_finish_destroy(ndev); 385 return NULL; 386 } 387 388 /* One reference from device. We must do this before 389 * we invoke __ipv6_regen_rndid(). 390 */ 391 in6_dev_hold(ndev); 392 393 #ifdef CONFIG_IPV6_PRIVACY 394 init_timer(&ndev->regen_timer); 395 ndev->regen_timer.function = ipv6_regen_rndid; 396 ndev->regen_timer.data = (unsigned long) ndev; 397 if ((dev->flags&IFF_LOOPBACK) || 398 dev->type == ARPHRD_TUNNEL || 399 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 400 dev->type == ARPHRD_SIT || 401 #endif 402 dev->type == ARPHRD_NONE) { 403 printk(KERN_INFO 404 "%s: Disabled Privacy Extensions\n", 405 dev->name); 406 ndev->cnf.use_tempaddr = -1; 407 } else { 408 in6_dev_hold(ndev); 409 ipv6_regen_rndid((unsigned long) ndev); 410 } 411 #endif 412 413 if (netif_carrier_ok(dev)) 414 ndev->if_flags |= IF_READY; 415 416 /* protected by rtnl_lock */ 417 rcu_assign_pointer(dev->ip6_ptr, ndev); 418 419 ipv6_mc_init_dev(ndev); 420 ndev->tstamp = jiffies; 421 #ifdef CONFIG_SYSCTL 422 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 423 NET_IPV6_NEIGH, "ipv6", 424 &ndisc_ifinfo_sysctl_change, 425 NULL); 426 addrconf_sysctl_register(ndev, &ndev->cnf); 427 #endif 428 return ndev; 429 } 430 431 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 432 { 433 struct inet6_dev *idev; 434 435 ASSERT_RTNL(); 436 437 if ((idev = __in6_dev_get(dev)) == NULL) { 438 if ((idev = ipv6_add_dev(dev)) == NULL) 439 return NULL; 440 } 441 442 if (dev->flags&IFF_UP) 443 ipv6_mc_up(idev); 444 return idev; 445 } 446 447 #ifdef CONFIG_SYSCTL 448 static void dev_forward_change(struct inet6_dev *idev) 449 { 450 struct net_device *dev; 451 struct inet6_ifaddr *ifa; 452 struct in6_addr addr; 453 454 if (!idev) 455 return; 456 dev = idev->dev; 457 if (dev && (dev->flags & IFF_MULTICAST)) { 458 ipv6_addr_all_routers(&addr); 459 460 if (idev->cnf.forwarding) 461 ipv6_dev_mc_inc(dev, &addr); 462 else 463 ipv6_dev_mc_dec(dev, &addr); 464 } 465 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 466 if (idev->cnf.forwarding) 467 addrconf_join_anycast(ifa); 468 else 469 addrconf_leave_anycast(ifa); 470 } 471 } 472 473 474 static void addrconf_forward_change(void) 475 { 476 struct net_device *dev; 477 struct inet6_dev *idev; 478 479 read_lock(&dev_base_lock); 480 for (dev=dev_base; dev; dev=dev->next) { 481 rcu_read_lock(); 482 idev = __in6_dev_get(dev); 483 if (idev) { 484 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); 485 idev->cnf.forwarding = ipv6_devconf.forwarding; 486 if (changed) 487 dev_forward_change(idev); 488 } 489 rcu_read_unlock(); 490 } 491 read_unlock(&dev_base_lock); 492 } 493 #endif 494 495 /* Nobody refers to this ifaddr, destroy it */ 496 497 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 498 { 499 BUG_TRAP(ifp->if_next==NULL); 500 BUG_TRAP(ifp->lst_next==NULL); 501 #ifdef NET_REFCNT_DEBUG 502 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 503 #endif 504 505 in6_dev_put(ifp->idev); 506 507 if (del_timer(&ifp->timer)) 508 printk("Timer is still running, when freeing ifa=%p\n", ifp); 509 510 if (!ifp->dead) { 511 printk("Freeing alive inet6 address %p\n", ifp); 512 return; 513 } 514 dst_release(&ifp->rt->u.dst); 515 516 kfree(ifp); 517 } 518 519 static void 520 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 521 { 522 struct inet6_ifaddr *ifa, **ifap; 523 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 524 525 /* 526 * Each device address list is sorted in order of scope - 527 * global before linklocal. 528 */ 529 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 530 ifap = &ifa->if_next) { 531 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 532 break; 533 } 534 535 ifp->if_next = *ifap; 536 *ifap = ifp; 537 } 538 539 /* On success it returns ifp with increased reference count */ 540 541 static struct inet6_ifaddr * 542 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 543 int scope, u32 flags) 544 { 545 struct inet6_ifaddr *ifa = NULL; 546 struct rt6_info *rt; 547 int hash; 548 int err = 0; 549 550 rcu_read_lock_bh(); 551 if (idev->dead) { 552 err = -ENODEV; /*XXX*/ 553 goto out2; 554 } 555 556 write_lock(&addrconf_hash_lock); 557 558 /* Ignore adding duplicate addresses on an interface */ 559 if (ipv6_chk_same_addr(addr, idev->dev)) { 560 ADBG(("ipv6_add_addr: already assigned\n")); 561 err = -EEXIST; 562 goto out; 563 } 564 565 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 566 567 if (ifa == NULL) { 568 ADBG(("ipv6_add_addr: malloc failed\n")); 569 err = -ENOBUFS; 570 goto out; 571 } 572 573 rt = addrconf_dst_alloc(idev, addr, 0); 574 if (IS_ERR(rt)) { 575 err = PTR_ERR(rt); 576 goto out; 577 } 578 579 ipv6_addr_copy(&ifa->addr, addr); 580 581 spin_lock_init(&ifa->lock); 582 init_timer(&ifa->timer); 583 ifa->timer.data = (unsigned long) ifa; 584 ifa->scope = scope; 585 ifa->prefix_len = pfxlen; 586 ifa->flags = flags | IFA_F_TENTATIVE; 587 ifa->cstamp = ifa->tstamp = jiffies; 588 589 ifa->rt = rt; 590 591 ifa->idev = idev; 592 in6_dev_hold(idev); 593 /* For caller */ 594 in6_ifa_hold(ifa); 595 596 /* Add to big hash table */ 597 hash = ipv6_addr_hash(addr); 598 599 ifa->lst_next = inet6_addr_lst[hash]; 600 inet6_addr_lst[hash] = ifa; 601 in6_ifa_hold(ifa); 602 write_unlock(&addrconf_hash_lock); 603 604 write_lock(&idev->lock); 605 /* Add to inet6_dev unicast addr list. */ 606 ipv6_link_dev_addr(idev, ifa); 607 608 #ifdef CONFIG_IPV6_PRIVACY 609 if (ifa->flags&IFA_F_TEMPORARY) { 610 ifa->tmp_next = idev->tempaddr_list; 611 idev->tempaddr_list = ifa; 612 in6_ifa_hold(ifa); 613 } 614 #endif 615 616 in6_ifa_hold(ifa); 617 write_unlock(&idev->lock); 618 out2: 619 rcu_read_unlock_bh(); 620 621 if (likely(err == 0)) 622 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 623 else { 624 kfree(ifa); 625 ifa = ERR_PTR(err); 626 } 627 628 return ifa; 629 out: 630 write_unlock(&addrconf_hash_lock); 631 goto out2; 632 } 633 634 /* This function wants to get referenced ifp and releases it before return */ 635 636 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 637 { 638 struct inet6_ifaddr *ifa, **ifap; 639 struct inet6_dev *idev = ifp->idev; 640 int hash; 641 int deleted = 0, onlink = 0; 642 unsigned long expires = jiffies; 643 644 hash = ipv6_addr_hash(&ifp->addr); 645 646 ifp->dead = 1; 647 648 write_lock_bh(&addrconf_hash_lock); 649 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 650 ifap = &ifa->lst_next) { 651 if (ifa == ifp) { 652 *ifap = ifa->lst_next; 653 __in6_ifa_put(ifp); 654 ifa->lst_next = NULL; 655 break; 656 } 657 } 658 write_unlock_bh(&addrconf_hash_lock); 659 660 write_lock_bh(&idev->lock); 661 #ifdef CONFIG_IPV6_PRIVACY 662 if (ifp->flags&IFA_F_TEMPORARY) { 663 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 664 ifap = &ifa->tmp_next) { 665 if (ifa == ifp) { 666 *ifap = ifa->tmp_next; 667 if (ifp->ifpub) { 668 in6_ifa_put(ifp->ifpub); 669 ifp->ifpub = NULL; 670 } 671 __in6_ifa_put(ifp); 672 ifa->tmp_next = NULL; 673 break; 674 } 675 } 676 } 677 #endif 678 679 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 680 if (ifa == ifp) { 681 *ifap = ifa->if_next; 682 __in6_ifa_put(ifp); 683 ifa->if_next = NULL; 684 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 685 break; 686 deleted = 1; 687 continue; 688 } else if (ifp->flags & IFA_F_PERMANENT) { 689 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 690 ifp->prefix_len)) { 691 if (ifa->flags & IFA_F_PERMANENT) { 692 onlink = 1; 693 if (deleted) 694 break; 695 } else { 696 unsigned long lifetime; 697 698 if (!onlink) 699 onlink = -1; 700 701 spin_lock(&ifa->lock); 702 lifetime = min_t(unsigned long, 703 ifa->valid_lft, 0x7fffffffUL/HZ); 704 if (time_before(expires, 705 ifa->tstamp + lifetime * HZ)) 706 expires = ifa->tstamp + lifetime * HZ; 707 spin_unlock(&ifa->lock); 708 } 709 } 710 } 711 ifap = &ifa->if_next; 712 } 713 write_unlock_bh(&idev->lock); 714 715 ipv6_ifa_notify(RTM_DELADDR, ifp); 716 717 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 718 719 addrconf_del_timer(ifp); 720 721 /* 722 * Purge or update corresponding prefix 723 * 724 * 1) we don't purge prefix here if address was not permanent. 725 * prefix is managed by its own lifetime. 726 * 2) if there're no addresses, delete prefix. 727 * 3) if there're still other permanent address(es), 728 * corresponding prefix is still permanent. 729 * 4) otherwise, update prefix lifetime to the 730 * longest valid lifetime among the corresponding 731 * addresses on the device. 732 * Note: subsequent RA will update lifetime. 733 * 734 * --yoshfuji 735 */ 736 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 737 struct in6_addr prefix; 738 struct rt6_info *rt; 739 740 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 741 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 742 743 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 744 if (onlink == 0) { 745 ip6_del_rt(rt); 746 rt = NULL; 747 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 748 rt->rt6i_expires = expires; 749 rt->rt6i_flags |= RTF_EXPIRES; 750 } 751 } 752 dst_release(&rt->u.dst); 753 } 754 755 in6_ifa_put(ifp); 756 } 757 758 #ifdef CONFIG_IPV6_PRIVACY 759 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 760 { 761 struct inet6_dev *idev = ifp->idev; 762 struct in6_addr addr, *tmpaddr; 763 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 764 int tmp_plen; 765 int ret = 0; 766 int max_addresses; 767 768 write_lock(&idev->lock); 769 if (ift) { 770 spin_lock_bh(&ift->lock); 771 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 772 spin_unlock_bh(&ift->lock); 773 tmpaddr = &addr; 774 } else { 775 tmpaddr = NULL; 776 } 777 retry: 778 in6_dev_hold(idev); 779 if (idev->cnf.use_tempaddr <= 0) { 780 write_unlock(&idev->lock); 781 printk(KERN_INFO 782 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 783 in6_dev_put(idev); 784 ret = -1; 785 goto out; 786 } 787 spin_lock_bh(&ifp->lock); 788 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 789 idev->cnf.use_tempaddr = -1; /*XXX*/ 790 spin_unlock_bh(&ifp->lock); 791 write_unlock(&idev->lock); 792 printk(KERN_WARNING 793 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 794 in6_dev_put(idev); 795 ret = -1; 796 goto out; 797 } 798 in6_ifa_hold(ifp); 799 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 800 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 801 spin_unlock_bh(&ifp->lock); 802 write_unlock(&idev->lock); 803 printk(KERN_WARNING 804 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 805 in6_ifa_put(ifp); 806 in6_dev_put(idev); 807 ret = -1; 808 goto out; 809 } 810 memcpy(&addr.s6_addr[8], idev->rndid, 8); 811 tmp_valid_lft = min_t(__u32, 812 ifp->valid_lft, 813 idev->cnf.temp_valid_lft); 814 tmp_prefered_lft = min_t(__u32, 815 ifp->prefered_lft, 816 idev->cnf.temp_prefered_lft - desync_factor / HZ); 817 tmp_plen = ifp->prefix_len; 818 max_addresses = idev->cnf.max_addresses; 819 tmp_cstamp = ifp->cstamp; 820 tmp_tstamp = ifp->tstamp; 821 spin_unlock_bh(&ifp->lock); 822 823 write_unlock(&idev->lock); 824 ift = !max_addresses || 825 ipv6_count_addresses(idev) < max_addresses ? 826 ipv6_add_addr(idev, &addr, tmp_plen, 827 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL; 828 if (!ift || IS_ERR(ift)) { 829 in6_ifa_put(ifp); 830 in6_dev_put(idev); 831 printk(KERN_INFO 832 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 833 tmpaddr = &addr; 834 write_lock(&idev->lock); 835 goto retry; 836 } 837 838 spin_lock_bh(&ift->lock); 839 ift->ifpub = ifp; 840 ift->valid_lft = tmp_valid_lft; 841 ift->prefered_lft = tmp_prefered_lft; 842 ift->cstamp = tmp_cstamp; 843 ift->tstamp = tmp_tstamp; 844 spin_unlock_bh(&ift->lock); 845 846 addrconf_dad_start(ift, 0); 847 in6_ifa_put(ift); 848 in6_dev_put(idev); 849 out: 850 return ret; 851 } 852 #endif 853 854 /* 855 * Choose an appropriate source address (RFC3484) 856 */ 857 struct ipv6_saddr_score { 858 int addr_type; 859 unsigned int attrs; 860 int matchlen; 861 int scope; 862 unsigned int rule; 863 }; 864 865 #define IPV6_SADDR_SCORE_LOCAL 0x0001 866 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 867 #define IPV6_SADDR_SCORE_HOA 0x0008 868 #define IPV6_SADDR_SCORE_OIF 0x0010 869 #define IPV6_SADDR_SCORE_LABEL 0x0020 870 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 871 872 static int inline ipv6_saddr_preferred(int type) 873 { 874 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 875 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 876 return 1; 877 return 0; 878 } 879 880 /* static matching label */ 881 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type) 882 { 883 /* 884 * prefix (longest match) label 885 * ----------------------------- 886 * ::1/128 0 887 * ::/0 1 888 * 2002::/16 2 889 * ::/96 3 890 * ::ffff:0:0/96 4 891 * fc00::/7 5 892 * 2001::/32 6 893 */ 894 if (type & IPV6_ADDR_LOOPBACK) 895 return 0; 896 else if (type & IPV6_ADDR_COMPATv4) 897 return 3; 898 else if (type & IPV6_ADDR_MAPPED) 899 return 4; 900 else if (addr->s6_addr32[0] == htonl(0x20010000)) 901 return 6; 902 else if (addr->s6_addr16[0] == htons(0x2002)) 903 return 2; 904 else if ((addr->s6_addr[0] & 0xfe) == 0xfc) 905 return 5; 906 return 1; 907 } 908 909 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 910 struct in6_addr *daddr, struct in6_addr *saddr) 911 { 912 struct ipv6_saddr_score hiscore; 913 struct inet6_ifaddr *ifa_result = NULL; 914 int daddr_type = __ipv6_addr_type(daddr); 915 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 916 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type); 917 struct net_device *dev; 918 919 memset(&hiscore, 0, sizeof(hiscore)); 920 921 read_lock(&dev_base_lock); 922 rcu_read_lock(); 923 924 for (dev = dev_base; dev; dev=dev->next) { 925 struct inet6_dev *idev; 926 struct inet6_ifaddr *ifa; 927 928 /* Rule 0: Candidate Source Address (section 4) 929 * - multicast and link-local destination address, 930 * the set of candidate source address MUST only 931 * include addresses assigned to interfaces 932 * belonging to the same link as the outgoing 933 * interface. 934 * (- For site-local destination addresses, the 935 * set of candidate source addresses MUST only 936 * include addresses assigned to interfaces 937 * belonging to the same site as the outgoing 938 * interface.) 939 */ 940 if ((daddr_type & IPV6_ADDR_MULTICAST || 941 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 942 daddr_dev && dev != daddr_dev) 943 continue; 944 945 idev = __in6_dev_get(dev); 946 if (!idev) 947 continue; 948 949 read_lock_bh(&idev->lock); 950 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 951 struct ipv6_saddr_score score; 952 953 score.addr_type = __ipv6_addr_type(&ifa->addr); 954 955 /* Rule 0: 956 * - Tentative Address (RFC2462 section 5.4) 957 * - A tentative address is not considered 958 * "assigned to an interface" in the traditional 959 * sense. 960 * - Candidate Source Address (section 4) 961 * - In any case, anycast addresses, multicast 962 * addresses, and the unspecified address MUST 963 * NOT be included in a candidate set. 964 */ 965 if (ifa->flags & IFA_F_TENTATIVE) 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 address */ 1025 if (hiscore.rule < 3) { 1026 if (ipv6_saddr_preferred(hiscore.addr_type) || 1027 !(ifa_result->flags & IFA_F_DEPRECATED)) 1028 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1029 hiscore.rule++; 1030 } 1031 if (ipv6_saddr_preferred(score.addr_type) || 1032 !(ifa->flags & IFA_F_DEPRECATED)) { 1033 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1034 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 1035 score.rule = 3; 1036 goto record_it; 1037 } 1038 } else { 1039 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 1040 continue; 1041 } 1042 1043 /* Rule 4: Prefer home address */ 1044 #ifdef CONFIG_IPV6_MIP6 1045 if (hiscore.rule < 4) { 1046 if (ifa_result->flags & IFA_F_HOMEADDRESS) 1047 hiscore.attrs |= IPV6_SADDR_SCORE_HOA; 1048 hiscore.rule++; 1049 } 1050 if (ifa->flags & IFA_F_HOMEADDRESS) { 1051 score.attrs |= IPV6_SADDR_SCORE_HOA; 1052 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) { 1053 score.rule = 4; 1054 goto record_it; 1055 } 1056 } else { 1057 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA) 1058 continue; 1059 } 1060 #else 1061 if (hiscore.rule < 4) 1062 hiscore.rule++; 1063 #endif 1064 1065 /* Rule 5: Prefer outgoing interface */ 1066 if (hiscore.rule < 5) { 1067 if (daddr_dev == NULL || 1068 daddr_dev == ifa_result->idev->dev) 1069 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1070 hiscore.rule++; 1071 } 1072 if (daddr_dev == NULL || 1073 daddr_dev == ifa->idev->dev) { 1074 score.attrs |= IPV6_SADDR_SCORE_OIF; 1075 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1076 score.rule = 5; 1077 goto record_it; 1078 } 1079 } else { 1080 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1081 continue; 1082 } 1083 1084 /* Rule 6: Prefer matching label */ 1085 if (hiscore.rule < 6) { 1086 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) 1087 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1088 hiscore.rule++; 1089 } 1090 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { 1091 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1092 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1093 score.rule = 6; 1094 goto record_it; 1095 } 1096 } else { 1097 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1098 continue; 1099 } 1100 1101 #ifdef CONFIG_IPV6_PRIVACY 1102 /* Rule 7: Prefer public address 1103 * Note: prefer temprary address if use_tempaddr >= 2 1104 */ 1105 if (hiscore.rule < 7) { 1106 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1107 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1108 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1109 hiscore.rule++; 1110 } 1111 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1112 (ifa->idev->cnf.use_tempaddr >= 2)) { 1113 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1114 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1115 score.rule = 7; 1116 goto record_it; 1117 } 1118 } else { 1119 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1120 continue; 1121 } 1122 #else 1123 if (hiscore.rule < 7) 1124 hiscore.rule++; 1125 #endif 1126 /* Rule 8: Use longest matching prefix */ 1127 if (hiscore.rule < 8) { 1128 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1129 hiscore.rule++; 1130 } 1131 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1132 if (score.matchlen > hiscore.matchlen) { 1133 score.rule = 8; 1134 goto record_it; 1135 } 1136 #if 0 1137 else if (score.matchlen < hiscore.matchlen) 1138 continue; 1139 #endif 1140 1141 /* Final Rule: choose first available one */ 1142 continue; 1143 record_it: 1144 if (ifa_result) 1145 in6_ifa_put(ifa_result); 1146 in6_ifa_hold(ifa); 1147 ifa_result = ifa; 1148 hiscore = score; 1149 } 1150 read_unlock_bh(&idev->lock); 1151 } 1152 rcu_read_unlock(); 1153 read_unlock(&dev_base_lock); 1154 1155 if (!ifa_result) 1156 return -EADDRNOTAVAIL; 1157 1158 ipv6_addr_copy(saddr, &ifa_result->addr); 1159 in6_ifa_put(ifa_result); 1160 return 0; 1161 } 1162 1163 1164 int ipv6_get_saddr(struct dst_entry *dst, 1165 struct in6_addr *daddr, struct in6_addr *saddr) 1166 { 1167 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr); 1168 } 1169 1170 1171 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr) 1172 { 1173 struct inet6_dev *idev; 1174 int err = -EADDRNOTAVAIL; 1175 1176 rcu_read_lock(); 1177 if ((idev = __in6_dev_get(dev)) != NULL) { 1178 struct inet6_ifaddr *ifp; 1179 1180 read_lock_bh(&idev->lock); 1181 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1182 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1183 ipv6_addr_copy(addr, &ifp->addr); 1184 err = 0; 1185 break; 1186 } 1187 } 1188 read_unlock_bh(&idev->lock); 1189 } 1190 rcu_read_unlock(); 1191 return err; 1192 } 1193 1194 static int ipv6_count_addresses(struct inet6_dev *idev) 1195 { 1196 int cnt = 0; 1197 struct inet6_ifaddr *ifp; 1198 1199 read_lock_bh(&idev->lock); 1200 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1201 cnt++; 1202 read_unlock_bh(&idev->lock); 1203 return cnt; 1204 } 1205 1206 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1207 { 1208 struct inet6_ifaddr * ifp; 1209 u8 hash = ipv6_addr_hash(addr); 1210 1211 read_lock_bh(&addrconf_hash_lock); 1212 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1213 if (ipv6_addr_equal(&ifp->addr, addr) && 1214 !(ifp->flags&IFA_F_TENTATIVE)) { 1215 if (dev == NULL || ifp->idev->dev == dev || 1216 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1217 break; 1218 } 1219 } 1220 read_unlock_bh(&addrconf_hash_lock); 1221 return ifp != NULL; 1222 } 1223 1224 static 1225 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1226 { 1227 struct inet6_ifaddr * ifp; 1228 u8 hash = ipv6_addr_hash(addr); 1229 1230 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1231 if (ipv6_addr_equal(&ifp->addr, addr)) { 1232 if (dev == NULL || ifp->idev->dev == dev) 1233 break; 1234 } 1235 } 1236 return ifp != NULL; 1237 } 1238 1239 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1240 { 1241 struct inet6_ifaddr * ifp; 1242 u8 hash = ipv6_addr_hash(addr); 1243 1244 read_lock_bh(&addrconf_hash_lock); 1245 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1246 if (ipv6_addr_equal(&ifp->addr, addr)) { 1247 if (dev == NULL || ifp->idev->dev == dev || 1248 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1249 in6_ifa_hold(ifp); 1250 break; 1251 } 1252 } 1253 } 1254 read_unlock_bh(&addrconf_hash_lock); 1255 1256 return ifp; 1257 } 1258 1259 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1260 { 1261 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1262 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1263 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1264 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1265 int sk_ipv6only = ipv6_only_sock(sk); 1266 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1267 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1268 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1269 1270 if (!sk2_rcv_saddr && !sk_ipv6only) 1271 return 1; 1272 1273 if (addr_type2 == IPV6_ADDR_ANY && 1274 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1275 return 1; 1276 1277 if (addr_type == IPV6_ADDR_ANY && 1278 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1279 return 1; 1280 1281 if (sk2_rcv_saddr6 && 1282 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1283 return 1; 1284 1285 if (addr_type == IPV6_ADDR_MAPPED && 1286 !sk2_ipv6only && 1287 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1288 return 1; 1289 1290 return 0; 1291 } 1292 1293 /* Gets referenced address, destroys ifaddr */ 1294 1295 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1296 { 1297 if (ifp->flags&IFA_F_PERMANENT) { 1298 spin_lock_bh(&ifp->lock); 1299 addrconf_del_timer(ifp); 1300 ifp->flags |= IFA_F_TENTATIVE; 1301 spin_unlock_bh(&ifp->lock); 1302 in6_ifa_put(ifp); 1303 #ifdef CONFIG_IPV6_PRIVACY 1304 } else if (ifp->flags&IFA_F_TEMPORARY) { 1305 struct inet6_ifaddr *ifpub; 1306 spin_lock_bh(&ifp->lock); 1307 ifpub = ifp->ifpub; 1308 if (ifpub) { 1309 in6_ifa_hold(ifpub); 1310 spin_unlock_bh(&ifp->lock); 1311 ipv6_create_tempaddr(ifpub, ifp); 1312 in6_ifa_put(ifpub); 1313 } else { 1314 spin_unlock_bh(&ifp->lock); 1315 } 1316 ipv6_del_addr(ifp); 1317 #endif 1318 } else 1319 ipv6_del_addr(ifp); 1320 } 1321 1322 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1323 { 1324 if (net_ratelimit()) 1325 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1326 addrconf_dad_stop(ifp); 1327 } 1328 1329 /* Join to solicited addr multicast group. */ 1330 1331 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1332 { 1333 struct in6_addr maddr; 1334 1335 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1336 return; 1337 1338 addrconf_addr_solict_mult(addr, &maddr); 1339 ipv6_dev_mc_inc(dev, &maddr); 1340 } 1341 1342 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1343 { 1344 struct in6_addr maddr; 1345 1346 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1347 return; 1348 1349 addrconf_addr_solict_mult(addr, &maddr); 1350 __ipv6_dev_mc_dec(idev, &maddr); 1351 } 1352 1353 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1354 { 1355 struct in6_addr addr; 1356 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1357 if (ipv6_addr_any(&addr)) 1358 return; 1359 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1360 } 1361 1362 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1363 { 1364 struct in6_addr addr; 1365 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1366 if (ipv6_addr_any(&addr)) 1367 return; 1368 __ipv6_dev_ac_dec(ifp->idev, &addr); 1369 } 1370 1371 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1372 { 1373 if (dev->addr_len != ETH_ALEN) 1374 return -1; 1375 memcpy(eui, dev->dev_addr, 3); 1376 memcpy(eui + 5, dev->dev_addr + 3, 3); 1377 1378 /* 1379 * The zSeries OSA network cards can be shared among various 1380 * OS instances, but the OSA cards have only one MAC address. 1381 * This leads to duplicate address conflicts in conjunction 1382 * with IPv6 if more than one instance uses the same card. 1383 * 1384 * The driver for these cards can deliver a unique 16-bit 1385 * identifier for each instance sharing the same card. It is 1386 * placed instead of 0xFFFE in the interface identifier. The 1387 * "u" bit of the interface identifier is not inverted in this 1388 * case. Hence the resulting interface identifier has local 1389 * scope according to RFC2373. 1390 */ 1391 if (dev->dev_id) { 1392 eui[3] = (dev->dev_id >> 8) & 0xFF; 1393 eui[4] = dev->dev_id & 0xFF; 1394 } else { 1395 eui[3] = 0xFF; 1396 eui[4] = 0xFE; 1397 eui[0] ^= 2; 1398 } 1399 return 0; 1400 } 1401 1402 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1403 { 1404 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1405 if (dev->addr_len != ARCNET_ALEN) 1406 return -1; 1407 memset(eui, 0, 7); 1408 eui[7] = *(u8*)dev->dev_addr; 1409 return 0; 1410 } 1411 1412 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1413 { 1414 if (dev->addr_len != INFINIBAND_ALEN) 1415 return -1; 1416 memcpy(eui, dev->dev_addr + 12, 8); 1417 eui[0] |= 2; 1418 return 0; 1419 } 1420 1421 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1422 { 1423 switch (dev->type) { 1424 case ARPHRD_ETHER: 1425 case ARPHRD_FDDI: 1426 case ARPHRD_IEEE802_TR: 1427 return addrconf_ifid_eui48(eui, dev); 1428 case ARPHRD_ARCNET: 1429 return addrconf_ifid_arcnet(eui, dev); 1430 case ARPHRD_INFINIBAND: 1431 return addrconf_ifid_infiniband(eui, dev); 1432 } 1433 return -1; 1434 } 1435 1436 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1437 { 1438 int err = -1; 1439 struct inet6_ifaddr *ifp; 1440 1441 read_lock_bh(&idev->lock); 1442 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1443 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1444 memcpy(eui, ifp->addr.s6_addr+8, 8); 1445 err = 0; 1446 break; 1447 } 1448 } 1449 read_unlock_bh(&idev->lock); 1450 return err; 1451 } 1452 1453 #ifdef CONFIG_IPV6_PRIVACY 1454 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1455 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1456 { 1457 regen: 1458 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1459 idev->rndid[0] &= ~0x02; 1460 1461 /* 1462 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1463 * check if generated address is not inappropriate 1464 * 1465 * - Reserved subnet anycast (RFC 2526) 1466 * 11111101 11....11 1xxxxxxx 1467 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 1468 * 00-00-5E-FE-xx-xx-xx-xx 1469 * - value 0 1470 * - XXX: already assigned to an address on the device 1471 */ 1472 if (idev->rndid[0] == 0xfd && 1473 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1474 (idev->rndid[7]&0x80)) 1475 goto regen; 1476 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1477 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1478 goto regen; 1479 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1480 goto regen; 1481 } 1482 1483 return 0; 1484 } 1485 1486 static void ipv6_regen_rndid(unsigned long data) 1487 { 1488 struct inet6_dev *idev = (struct inet6_dev *) data; 1489 unsigned long expires; 1490 1491 rcu_read_lock_bh(); 1492 write_lock_bh(&idev->lock); 1493 1494 if (idev->dead) 1495 goto out; 1496 1497 if (__ipv6_regen_rndid(idev) < 0) 1498 goto out; 1499 1500 expires = jiffies + 1501 idev->cnf.temp_prefered_lft * HZ - 1502 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1503 if (time_before(expires, jiffies)) { 1504 printk(KERN_WARNING 1505 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1506 idev->dev->name); 1507 goto out; 1508 } 1509 1510 if (!mod_timer(&idev->regen_timer, expires)) 1511 in6_dev_hold(idev); 1512 1513 out: 1514 write_unlock_bh(&idev->lock); 1515 rcu_read_unlock_bh(); 1516 in6_dev_put(idev); 1517 } 1518 1519 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1520 int ret = 0; 1521 1522 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1523 ret = __ipv6_regen_rndid(idev); 1524 return ret; 1525 } 1526 #endif 1527 1528 /* 1529 * Add prefix route. 1530 */ 1531 1532 static void 1533 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1534 unsigned long expires, u32 flags) 1535 { 1536 struct fib6_config cfg = { 1537 .fc_table = RT6_TABLE_PREFIX, 1538 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1539 .fc_ifindex = dev->ifindex, 1540 .fc_expires = expires, 1541 .fc_dst_len = plen, 1542 .fc_flags = RTF_UP | flags, 1543 }; 1544 1545 ipv6_addr_copy(&cfg.fc_dst, pfx); 1546 1547 /* Prevent useless cloning on PtP SIT. 1548 This thing is done here expecting that the whole 1549 class of non-broadcast devices need not cloning. 1550 */ 1551 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1552 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1553 cfg.fc_flags |= RTF_NONEXTHOP; 1554 #endif 1555 1556 ip6_route_add(&cfg); 1557 } 1558 1559 /* Create "default" multicast route to the interface */ 1560 1561 static void addrconf_add_mroute(struct net_device *dev) 1562 { 1563 struct fib6_config cfg = { 1564 .fc_table = RT6_TABLE_LOCAL, 1565 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1566 .fc_ifindex = dev->ifindex, 1567 .fc_dst_len = 8, 1568 .fc_flags = RTF_UP, 1569 }; 1570 1571 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1572 1573 ip6_route_add(&cfg); 1574 } 1575 1576 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1577 static void sit_route_add(struct net_device *dev) 1578 { 1579 struct fib6_config cfg = { 1580 .fc_table = RT6_TABLE_MAIN, 1581 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1582 .fc_ifindex = dev->ifindex, 1583 .fc_dst_len = 96, 1584 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1585 }; 1586 1587 /* prefix length - 96 bits "::d.d.d.d" */ 1588 ip6_route_add(&cfg); 1589 } 1590 #endif 1591 1592 static void addrconf_add_lroute(struct net_device *dev) 1593 { 1594 struct in6_addr addr; 1595 1596 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1597 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1598 } 1599 1600 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1601 { 1602 struct inet6_dev *idev; 1603 1604 ASSERT_RTNL(); 1605 1606 if ((idev = ipv6_find_idev(dev)) == NULL) 1607 return NULL; 1608 1609 /* Add default multicast route */ 1610 addrconf_add_mroute(dev); 1611 1612 /* Add link local route */ 1613 addrconf_add_lroute(dev); 1614 return idev; 1615 } 1616 1617 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1618 { 1619 struct prefix_info *pinfo; 1620 __u32 valid_lft; 1621 __u32 prefered_lft; 1622 int addr_type; 1623 unsigned long rt_expires; 1624 struct inet6_dev *in6_dev; 1625 1626 pinfo = (struct prefix_info *) opt; 1627 1628 if (len < sizeof(struct prefix_info)) { 1629 ADBG(("addrconf: prefix option too short\n")); 1630 return; 1631 } 1632 1633 /* 1634 * Validation checks ([ADDRCONF], page 19) 1635 */ 1636 1637 addr_type = ipv6_addr_type(&pinfo->prefix); 1638 1639 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1640 return; 1641 1642 valid_lft = ntohl(pinfo->valid); 1643 prefered_lft = ntohl(pinfo->prefered); 1644 1645 if (prefered_lft > valid_lft) { 1646 if (net_ratelimit()) 1647 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1648 return; 1649 } 1650 1651 in6_dev = in6_dev_get(dev); 1652 1653 if (in6_dev == NULL) { 1654 if (net_ratelimit()) 1655 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1656 return; 1657 } 1658 1659 /* 1660 * Two things going on here: 1661 * 1) Add routes for on-link prefixes 1662 * 2) Configure prefixes with the auto flag set 1663 */ 1664 1665 /* Avoid arithmetic overflow. Really, we could 1666 save rt_expires in seconds, likely valid_lft, 1667 but it would require division in fib gc, that it 1668 not good. 1669 */ 1670 if (valid_lft >= 0x7FFFFFFF/HZ) 1671 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1672 else 1673 rt_expires = valid_lft * HZ; 1674 1675 /* 1676 * We convert this (in jiffies) to clock_t later. 1677 * Avoid arithmetic overflow there as well. 1678 * Overflow can happen only if HZ < USER_HZ. 1679 */ 1680 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1681 rt_expires = 0x7FFFFFFF / USER_HZ; 1682 1683 if (pinfo->onlink) { 1684 struct rt6_info *rt; 1685 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1686 1687 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1688 if (rt->rt6i_flags&RTF_EXPIRES) { 1689 if (valid_lft == 0) { 1690 ip6_del_rt(rt); 1691 rt = NULL; 1692 } else { 1693 rt->rt6i_expires = jiffies + rt_expires; 1694 } 1695 } 1696 } else if (valid_lft) { 1697 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1698 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1699 } 1700 if (rt) 1701 dst_release(&rt->u.dst); 1702 } 1703 1704 /* Try to figure out our local address for this prefix */ 1705 1706 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1707 struct inet6_ifaddr * ifp; 1708 struct in6_addr addr; 1709 int create = 0, update_lft = 0; 1710 1711 if (pinfo->prefix_len == 64) { 1712 memcpy(&addr, &pinfo->prefix, 8); 1713 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1714 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1715 in6_dev_put(in6_dev); 1716 return; 1717 } 1718 goto ok; 1719 } 1720 if (net_ratelimit()) 1721 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1722 pinfo->prefix_len); 1723 in6_dev_put(in6_dev); 1724 return; 1725 1726 ok: 1727 1728 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1729 1730 if (ifp == NULL && valid_lft) { 1731 int max_addresses = in6_dev->cnf.max_addresses; 1732 1733 /* Do not allow to create too much of autoconfigured 1734 * addresses; this would be too easy way to crash kernel. 1735 */ 1736 if (!max_addresses || 1737 ipv6_count_addresses(in6_dev) < max_addresses) 1738 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1739 addr_type&IPV6_ADDR_SCOPE_MASK, 0); 1740 1741 if (!ifp || IS_ERR(ifp)) { 1742 in6_dev_put(in6_dev); 1743 return; 1744 } 1745 1746 update_lft = create = 1; 1747 ifp->cstamp = jiffies; 1748 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1749 } 1750 1751 if (ifp) { 1752 int flags; 1753 unsigned long now; 1754 #ifdef CONFIG_IPV6_PRIVACY 1755 struct inet6_ifaddr *ift; 1756 #endif 1757 u32 stored_lft; 1758 1759 /* update lifetime (RFC2462 5.5.3 e) */ 1760 spin_lock(&ifp->lock); 1761 now = jiffies; 1762 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1763 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1764 else 1765 stored_lft = 0; 1766 if (!update_lft && stored_lft) { 1767 if (valid_lft > MIN_VALID_LIFETIME || 1768 valid_lft > stored_lft) 1769 update_lft = 1; 1770 else if (stored_lft <= MIN_VALID_LIFETIME) { 1771 /* valid_lft <= stored_lft is always true */ 1772 /* XXX: IPsec */ 1773 update_lft = 0; 1774 } else { 1775 valid_lft = MIN_VALID_LIFETIME; 1776 if (valid_lft < prefered_lft) 1777 prefered_lft = valid_lft; 1778 update_lft = 1; 1779 } 1780 } 1781 1782 if (update_lft) { 1783 ifp->valid_lft = valid_lft; 1784 ifp->prefered_lft = prefered_lft; 1785 ifp->tstamp = now; 1786 flags = ifp->flags; 1787 ifp->flags &= ~IFA_F_DEPRECATED; 1788 spin_unlock(&ifp->lock); 1789 1790 if (!(flags&IFA_F_TENTATIVE)) 1791 ipv6_ifa_notify(0, ifp); 1792 } else 1793 spin_unlock(&ifp->lock); 1794 1795 #ifdef CONFIG_IPV6_PRIVACY 1796 read_lock_bh(&in6_dev->lock); 1797 /* update all temporary addresses in the list */ 1798 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1799 /* 1800 * When adjusting the lifetimes of an existing 1801 * temporary address, only lower the lifetimes. 1802 * Implementations must not increase the 1803 * lifetimes of an existing temporary address 1804 * when processing a Prefix Information Option. 1805 */ 1806 spin_lock(&ift->lock); 1807 flags = ift->flags; 1808 if (ift->valid_lft > valid_lft && 1809 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1810 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1811 if (ift->prefered_lft > prefered_lft && 1812 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1813 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1814 spin_unlock(&ift->lock); 1815 if (!(flags&IFA_F_TENTATIVE)) 1816 ipv6_ifa_notify(0, ift); 1817 } 1818 1819 if (create && in6_dev->cnf.use_tempaddr > 0) { 1820 /* 1821 * When a new public address is created as described in [ADDRCONF], 1822 * also create a new temporary address. 1823 */ 1824 read_unlock_bh(&in6_dev->lock); 1825 ipv6_create_tempaddr(ifp, NULL); 1826 } else { 1827 read_unlock_bh(&in6_dev->lock); 1828 } 1829 #endif 1830 in6_ifa_put(ifp); 1831 addrconf_verify(0); 1832 } 1833 } 1834 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1835 in6_dev_put(in6_dev); 1836 } 1837 1838 /* 1839 * Set destination address. 1840 * Special case for SIT interfaces where we create a new "virtual" 1841 * device. 1842 */ 1843 int addrconf_set_dstaddr(void __user *arg) 1844 { 1845 struct in6_ifreq ireq; 1846 struct net_device *dev; 1847 int err = -EINVAL; 1848 1849 rtnl_lock(); 1850 1851 err = -EFAULT; 1852 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1853 goto err_exit; 1854 1855 dev = __dev_get_by_index(ireq.ifr6_ifindex); 1856 1857 err = -ENODEV; 1858 if (dev == NULL) 1859 goto err_exit; 1860 1861 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1862 if (dev->type == ARPHRD_SIT) { 1863 struct ifreq ifr; 1864 mm_segment_t oldfs; 1865 struct ip_tunnel_parm p; 1866 1867 err = -EADDRNOTAVAIL; 1868 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1869 goto err_exit; 1870 1871 memset(&p, 0, sizeof(p)); 1872 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1873 p.iph.saddr = 0; 1874 p.iph.version = 4; 1875 p.iph.ihl = 5; 1876 p.iph.protocol = IPPROTO_IPV6; 1877 p.iph.ttl = 64; 1878 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1879 1880 oldfs = get_fs(); set_fs(KERNEL_DS); 1881 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1882 set_fs(oldfs); 1883 1884 if (err == 0) { 1885 err = -ENOBUFS; 1886 if ((dev = __dev_get_by_name(p.name)) == NULL) 1887 goto err_exit; 1888 err = dev_open(dev); 1889 } 1890 } 1891 #endif 1892 1893 err_exit: 1894 rtnl_unlock(); 1895 return err; 1896 } 1897 1898 /* 1899 * Manual configuration of address on an interface 1900 */ 1901 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1902 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft) 1903 { 1904 struct inet6_ifaddr *ifp; 1905 struct inet6_dev *idev; 1906 struct net_device *dev; 1907 int scope; 1908 1909 ASSERT_RTNL(); 1910 1911 /* check the lifetime */ 1912 if (!valid_lft || prefered_lft > valid_lft) 1913 return -EINVAL; 1914 1915 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1916 return -ENODEV; 1917 1918 if ((idev = addrconf_add_dev(dev)) == NULL) 1919 return -ENOBUFS; 1920 1921 scope = ipv6_addr_scope(pfx); 1922 1923 if (valid_lft == INFINITY_LIFE_TIME) 1924 ifa_flags |= IFA_F_PERMANENT; 1925 else if (valid_lft >= 0x7FFFFFFF/HZ) 1926 valid_lft = 0x7FFFFFFF/HZ; 1927 1928 if (prefered_lft == 0) 1929 ifa_flags |= IFA_F_DEPRECATED; 1930 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1931 (prefered_lft != INFINITY_LIFE_TIME)) 1932 prefered_lft = 0x7FFFFFFF/HZ; 1933 1934 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1935 1936 if (!IS_ERR(ifp)) { 1937 spin_lock_bh(&ifp->lock); 1938 ifp->valid_lft = valid_lft; 1939 ifp->prefered_lft = prefered_lft; 1940 ifp->tstamp = jiffies; 1941 spin_unlock_bh(&ifp->lock); 1942 1943 addrconf_dad_start(ifp, 0); 1944 in6_ifa_put(ifp); 1945 addrconf_verify(0); 1946 return 0; 1947 } 1948 1949 return PTR_ERR(ifp); 1950 } 1951 1952 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1953 { 1954 struct inet6_ifaddr *ifp; 1955 struct inet6_dev *idev; 1956 struct net_device *dev; 1957 1958 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1959 return -ENODEV; 1960 1961 if ((idev = __in6_dev_get(dev)) == NULL) 1962 return -ENXIO; 1963 1964 read_lock_bh(&idev->lock); 1965 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1966 if (ifp->prefix_len == plen && 1967 ipv6_addr_equal(pfx, &ifp->addr)) { 1968 in6_ifa_hold(ifp); 1969 read_unlock_bh(&idev->lock); 1970 1971 ipv6_del_addr(ifp); 1972 1973 /* If the last address is deleted administratively, 1974 disable IPv6 on this interface. 1975 */ 1976 if (idev->addr_list == NULL) 1977 addrconf_ifdown(idev->dev, 1); 1978 return 0; 1979 } 1980 } 1981 read_unlock_bh(&idev->lock); 1982 return -EADDRNOTAVAIL; 1983 } 1984 1985 1986 int addrconf_add_ifaddr(void __user *arg) 1987 { 1988 struct in6_ifreq ireq; 1989 int err; 1990 1991 if (!capable(CAP_NET_ADMIN)) 1992 return -EPERM; 1993 1994 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1995 return -EFAULT; 1996 1997 rtnl_lock(); 1998 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 1999 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2000 rtnl_unlock(); 2001 return err; 2002 } 2003 2004 int addrconf_del_ifaddr(void __user *arg) 2005 { 2006 struct in6_ifreq ireq; 2007 int err; 2008 2009 if (!capable(CAP_NET_ADMIN)) 2010 return -EPERM; 2011 2012 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2013 return -EFAULT; 2014 2015 rtnl_lock(); 2016 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 2017 rtnl_unlock(); 2018 return err; 2019 } 2020 2021 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2022 static void sit_add_v4_addrs(struct inet6_dev *idev) 2023 { 2024 struct inet6_ifaddr * ifp; 2025 struct in6_addr addr; 2026 struct net_device *dev; 2027 int scope; 2028 2029 ASSERT_RTNL(); 2030 2031 memset(&addr, 0, sizeof(struct in6_addr)); 2032 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2033 2034 if (idev->dev->flags&IFF_POINTOPOINT) { 2035 addr.s6_addr32[0] = htonl(0xfe800000); 2036 scope = IFA_LINK; 2037 } else { 2038 scope = IPV6_ADDR_COMPATv4; 2039 } 2040 2041 if (addr.s6_addr32[3]) { 2042 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2043 if (!IS_ERR(ifp)) { 2044 spin_lock_bh(&ifp->lock); 2045 ifp->flags &= ~IFA_F_TENTATIVE; 2046 spin_unlock_bh(&ifp->lock); 2047 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2048 in6_ifa_put(ifp); 2049 } 2050 return; 2051 } 2052 2053 for (dev = dev_base; dev != NULL; dev = dev->next) { 2054 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2055 if (in_dev && (dev->flags & IFF_UP)) { 2056 struct in_ifaddr * ifa; 2057 2058 int flag = scope; 2059 2060 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2061 int plen; 2062 2063 addr.s6_addr32[3] = ifa->ifa_local; 2064 2065 if (ifa->ifa_scope == RT_SCOPE_LINK) 2066 continue; 2067 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2068 if (idev->dev->flags&IFF_POINTOPOINT) 2069 continue; 2070 flag |= IFA_HOST; 2071 } 2072 if (idev->dev->flags&IFF_POINTOPOINT) 2073 plen = 64; 2074 else 2075 plen = 96; 2076 2077 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2078 IFA_F_PERMANENT); 2079 if (!IS_ERR(ifp)) { 2080 spin_lock_bh(&ifp->lock); 2081 ifp->flags &= ~IFA_F_TENTATIVE; 2082 spin_unlock_bh(&ifp->lock); 2083 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2084 in6_ifa_put(ifp); 2085 } 2086 } 2087 } 2088 } 2089 } 2090 #endif 2091 2092 static void init_loopback(struct net_device *dev) 2093 { 2094 struct inet6_dev *idev; 2095 struct inet6_ifaddr * ifp; 2096 2097 /* ::1 */ 2098 2099 ASSERT_RTNL(); 2100 2101 if ((idev = ipv6_find_idev(dev)) == NULL) { 2102 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2103 return; 2104 } 2105 2106 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2107 if (!IS_ERR(ifp)) { 2108 spin_lock_bh(&ifp->lock); 2109 ifp->flags &= ~IFA_F_TENTATIVE; 2110 spin_unlock_bh(&ifp->lock); 2111 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2112 in6_ifa_put(ifp); 2113 } 2114 } 2115 2116 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2117 { 2118 struct inet6_ifaddr * ifp; 2119 2120 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT); 2121 if (!IS_ERR(ifp)) { 2122 addrconf_dad_start(ifp, 0); 2123 in6_ifa_put(ifp); 2124 } 2125 } 2126 2127 static void addrconf_dev_config(struct net_device *dev) 2128 { 2129 struct in6_addr addr; 2130 struct inet6_dev * idev; 2131 2132 ASSERT_RTNL(); 2133 2134 if ((dev->type != ARPHRD_ETHER) && 2135 (dev->type != ARPHRD_FDDI) && 2136 (dev->type != ARPHRD_IEEE802_TR) && 2137 (dev->type != ARPHRD_ARCNET) && 2138 (dev->type != ARPHRD_INFINIBAND)) { 2139 /* Alas, we support only Ethernet autoconfiguration. */ 2140 return; 2141 } 2142 2143 idev = addrconf_add_dev(dev); 2144 if (idev == NULL) 2145 return; 2146 2147 memset(&addr, 0, sizeof(struct in6_addr)); 2148 addr.s6_addr32[0] = htonl(0xFE800000); 2149 2150 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2151 addrconf_add_linklocal(idev, &addr); 2152 } 2153 2154 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2155 static void addrconf_sit_config(struct net_device *dev) 2156 { 2157 struct inet6_dev *idev; 2158 2159 ASSERT_RTNL(); 2160 2161 /* 2162 * Configure the tunnel with one of our IPv4 2163 * addresses... we should configure all of 2164 * our v4 addrs in the tunnel 2165 */ 2166 2167 if ((idev = ipv6_find_idev(dev)) == NULL) { 2168 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2169 return; 2170 } 2171 2172 sit_add_v4_addrs(idev); 2173 2174 if (dev->flags&IFF_POINTOPOINT) { 2175 addrconf_add_mroute(dev); 2176 addrconf_add_lroute(dev); 2177 } else 2178 sit_route_add(dev); 2179 } 2180 #endif 2181 2182 static inline int 2183 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2184 { 2185 struct in6_addr lladdr; 2186 2187 if (!ipv6_get_lladdr(link_dev, &lladdr)) { 2188 addrconf_add_linklocal(idev, &lladdr); 2189 return 0; 2190 } 2191 return -1; 2192 } 2193 2194 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2195 { 2196 struct net_device *link_dev; 2197 2198 /* first try to inherit the link-local address from the link device */ 2199 if (idev->dev->iflink && 2200 (link_dev = __dev_get_by_index(idev->dev->iflink))) { 2201 if (!ipv6_inherit_linklocal(idev, link_dev)) 2202 return; 2203 } 2204 /* then try to inherit it from any device */ 2205 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) { 2206 if (!ipv6_inherit_linklocal(idev, link_dev)) 2207 return; 2208 } 2209 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2210 } 2211 2212 /* 2213 * Autoconfigure tunnel with a link-local address so routing protocols, 2214 * DHCPv6, MLD etc. can be run over the virtual link 2215 */ 2216 2217 static void addrconf_ip6_tnl_config(struct net_device *dev) 2218 { 2219 struct inet6_dev *idev; 2220 2221 ASSERT_RTNL(); 2222 2223 if ((idev = addrconf_add_dev(dev)) == NULL) { 2224 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2225 return; 2226 } 2227 ip6_tnl_add_linklocal(idev); 2228 } 2229 2230 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2231 void * data) 2232 { 2233 struct net_device *dev = (struct net_device *) data; 2234 struct inet6_dev *idev = __in6_dev_get(dev); 2235 int run_pending = 0; 2236 2237 switch(event) { 2238 case NETDEV_UP: 2239 case NETDEV_CHANGE: 2240 if (event == NETDEV_UP) { 2241 if (!netif_carrier_ok(dev)) { 2242 /* device is not ready yet. */ 2243 printk(KERN_INFO 2244 "ADDRCONF(NETDEV_UP): %s: " 2245 "link is not ready\n", 2246 dev->name); 2247 break; 2248 } 2249 2250 if (idev) 2251 idev->if_flags |= IF_READY; 2252 } else { 2253 if (!netif_carrier_ok(dev)) { 2254 /* device is still not ready. */ 2255 break; 2256 } 2257 2258 if (idev) { 2259 if (idev->if_flags & IF_READY) { 2260 /* device is already configured. */ 2261 break; 2262 } 2263 idev->if_flags |= IF_READY; 2264 } 2265 2266 printk(KERN_INFO 2267 "ADDRCONF(NETDEV_CHANGE): %s: " 2268 "link becomes ready\n", 2269 dev->name); 2270 2271 run_pending = 1; 2272 } 2273 2274 switch(dev->type) { 2275 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2276 case ARPHRD_SIT: 2277 addrconf_sit_config(dev); 2278 break; 2279 #endif 2280 case ARPHRD_TUNNEL6: 2281 addrconf_ip6_tnl_config(dev); 2282 break; 2283 case ARPHRD_LOOPBACK: 2284 init_loopback(dev); 2285 break; 2286 2287 default: 2288 addrconf_dev_config(dev); 2289 break; 2290 }; 2291 if (idev) { 2292 if (run_pending) 2293 addrconf_dad_run(idev); 2294 2295 /* If the MTU changed during the interface down, when the 2296 interface up, the changed MTU must be reflected in the 2297 idev as well as routers. 2298 */ 2299 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2300 rt6_mtu_change(dev, dev->mtu); 2301 idev->cnf.mtu6 = dev->mtu; 2302 } 2303 idev->tstamp = jiffies; 2304 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2305 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2306 stop IPv6 on this interface. 2307 */ 2308 if (dev->mtu < IPV6_MIN_MTU) 2309 addrconf_ifdown(dev, event != NETDEV_DOWN); 2310 } 2311 break; 2312 2313 case NETDEV_CHANGEMTU: 2314 if ( idev && dev->mtu >= IPV6_MIN_MTU) { 2315 rt6_mtu_change(dev, dev->mtu); 2316 idev->cnf.mtu6 = dev->mtu; 2317 break; 2318 } 2319 2320 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2321 2322 case NETDEV_DOWN: 2323 case NETDEV_UNREGISTER: 2324 /* 2325 * Remove all addresses from this interface. 2326 */ 2327 addrconf_ifdown(dev, event != NETDEV_DOWN); 2328 break; 2329 2330 case NETDEV_CHANGENAME: 2331 #ifdef CONFIG_SYSCTL 2332 if (idev) { 2333 addrconf_sysctl_unregister(&idev->cnf); 2334 neigh_sysctl_unregister(idev->nd_parms); 2335 neigh_sysctl_register(dev, idev->nd_parms, 2336 NET_IPV6, NET_IPV6_NEIGH, "ipv6", 2337 &ndisc_ifinfo_sysctl_change, 2338 NULL); 2339 addrconf_sysctl_register(idev, &idev->cnf); 2340 } 2341 #endif 2342 break; 2343 }; 2344 2345 return NOTIFY_OK; 2346 } 2347 2348 /* 2349 * addrconf module should be notified of a device going up 2350 */ 2351 static struct notifier_block ipv6_dev_notf = { 2352 .notifier_call = addrconf_notify, 2353 .priority = 0 2354 }; 2355 2356 static int addrconf_ifdown(struct net_device *dev, int how) 2357 { 2358 struct inet6_dev *idev; 2359 struct inet6_ifaddr *ifa, **bifa; 2360 int i; 2361 2362 ASSERT_RTNL(); 2363 2364 if (dev == &loopback_dev && how == 1) 2365 how = 0; 2366 2367 rt6_ifdown(dev); 2368 neigh_ifdown(&nd_tbl, dev); 2369 2370 idev = __in6_dev_get(dev); 2371 if (idev == NULL) 2372 return -ENODEV; 2373 2374 /* Step 1: remove reference to ipv6 device from parent device. 2375 Do not dev_put! 2376 */ 2377 if (how == 1) { 2378 idev->dead = 1; 2379 2380 /* protected by rtnl_lock */ 2381 rcu_assign_pointer(dev->ip6_ptr, NULL); 2382 2383 /* Step 1.5: remove snmp6 entry */ 2384 snmp6_unregister_dev(idev); 2385 2386 } 2387 2388 /* Step 2: clear hash table */ 2389 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2390 bifa = &inet6_addr_lst[i]; 2391 2392 write_lock_bh(&addrconf_hash_lock); 2393 while ((ifa = *bifa) != NULL) { 2394 if (ifa->idev == idev) { 2395 *bifa = ifa->lst_next; 2396 ifa->lst_next = NULL; 2397 addrconf_del_timer(ifa); 2398 in6_ifa_put(ifa); 2399 continue; 2400 } 2401 bifa = &ifa->lst_next; 2402 } 2403 write_unlock_bh(&addrconf_hash_lock); 2404 } 2405 2406 write_lock_bh(&idev->lock); 2407 2408 /* Step 3: clear flags for stateless addrconf */ 2409 if (how != 1) 2410 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2411 2412 /* Step 4: clear address list */ 2413 #ifdef CONFIG_IPV6_PRIVACY 2414 if (how == 1 && del_timer(&idev->regen_timer)) 2415 in6_dev_put(idev); 2416 2417 /* clear tempaddr list */ 2418 while ((ifa = idev->tempaddr_list) != NULL) { 2419 idev->tempaddr_list = ifa->tmp_next; 2420 ifa->tmp_next = NULL; 2421 ifa->dead = 1; 2422 write_unlock_bh(&idev->lock); 2423 spin_lock_bh(&ifa->lock); 2424 2425 if (ifa->ifpub) { 2426 in6_ifa_put(ifa->ifpub); 2427 ifa->ifpub = NULL; 2428 } 2429 spin_unlock_bh(&ifa->lock); 2430 in6_ifa_put(ifa); 2431 write_lock_bh(&idev->lock); 2432 } 2433 #endif 2434 while ((ifa = idev->addr_list) != NULL) { 2435 idev->addr_list = ifa->if_next; 2436 ifa->if_next = NULL; 2437 ifa->dead = 1; 2438 addrconf_del_timer(ifa); 2439 write_unlock_bh(&idev->lock); 2440 2441 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2442 in6_ifa_put(ifa); 2443 2444 write_lock_bh(&idev->lock); 2445 } 2446 write_unlock_bh(&idev->lock); 2447 2448 /* Step 5: Discard multicast list */ 2449 2450 if (how == 1) 2451 ipv6_mc_destroy_dev(idev); 2452 else 2453 ipv6_mc_down(idev); 2454 2455 /* Step 5: netlink notification of this interface */ 2456 idev->tstamp = jiffies; 2457 inet6_ifinfo_notify(RTM_DELLINK, idev); 2458 2459 /* Shot the device (if unregistered) */ 2460 2461 if (how == 1) { 2462 #ifdef CONFIG_SYSCTL 2463 addrconf_sysctl_unregister(&idev->cnf); 2464 neigh_sysctl_unregister(idev->nd_parms); 2465 #endif 2466 neigh_parms_release(&nd_tbl, idev->nd_parms); 2467 neigh_ifdown(&nd_tbl, dev); 2468 in6_dev_put(idev); 2469 } 2470 return 0; 2471 } 2472 2473 static void addrconf_rs_timer(unsigned long data) 2474 { 2475 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2476 2477 if (ifp->idev->cnf.forwarding) 2478 goto out; 2479 2480 if (ifp->idev->if_flags & IF_RA_RCVD) { 2481 /* 2482 * Announcement received after solicitation 2483 * was sent 2484 */ 2485 goto out; 2486 } 2487 2488 spin_lock(&ifp->lock); 2489 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2490 struct in6_addr all_routers; 2491 2492 /* The wait after the last probe can be shorter */ 2493 addrconf_mod_timer(ifp, AC_RS, 2494 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2495 ifp->idev->cnf.rtr_solicit_delay : 2496 ifp->idev->cnf.rtr_solicit_interval); 2497 spin_unlock(&ifp->lock); 2498 2499 ipv6_addr_all_routers(&all_routers); 2500 2501 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2502 } else { 2503 spin_unlock(&ifp->lock); 2504 /* 2505 * Note: we do not support deprecated "all on-link" 2506 * assumption any longer. 2507 */ 2508 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2509 ifp->idev->dev->name); 2510 } 2511 2512 out: 2513 in6_ifa_put(ifp); 2514 } 2515 2516 /* 2517 * Duplicate Address Detection 2518 */ 2519 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2520 { 2521 unsigned long rand_num; 2522 struct inet6_dev *idev = ifp->idev; 2523 2524 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2525 ifp->probes = idev->cnf.dad_transmits; 2526 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2527 } 2528 2529 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2530 { 2531 struct inet6_dev *idev = ifp->idev; 2532 struct net_device *dev = idev->dev; 2533 2534 addrconf_join_solict(dev, &ifp->addr); 2535 2536 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT)) 2537 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0, 2538 flags); 2539 2540 net_srandom(ifp->addr.s6_addr32[3]); 2541 2542 read_lock_bh(&idev->lock); 2543 if (ifp->dead) 2544 goto out; 2545 spin_lock_bh(&ifp->lock); 2546 2547 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2548 !(ifp->flags&IFA_F_TENTATIVE) || 2549 ifp->flags & IFA_F_NODAD) { 2550 ifp->flags &= ~IFA_F_TENTATIVE; 2551 spin_unlock_bh(&ifp->lock); 2552 read_unlock_bh(&idev->lock); 2553 2554 addrconf_dad_completed(ifp); 2555 return; 2556 } 2557 2558 if (!(idev->if_flags & IF_READY)) { 2559 spin_unlock_bh(&ifp->lock); 2560 read_unlock_bh(&idev->lock); 2561 /* 2562 * If the defice is not ready: 2563 * - keep it tentative if it is a permanent address. 2564 * - otherwise, kill it. 2565 */ 2566 in6_ifa_hold(ifp); 2567 addrconf_dad_stop(ifp); 2568 return; 2569 } 2570 addrconf_dad_kick(ifp); 2571 spin_unlock_bh(&ifp->lock); 2572 out: 2573 read_unlock_bh(&idev->lock); 2574 } 2575 2576 static void addrconf_dad_timer(unsigned long data) 2577 { 2578 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2579 struct inet6_dev *idev = ifp->idev; 2580 struct in6_addr unspec; 2581 struct in6_addr mcaddr; 2582 2583 read_lock_bh(&idev->lock); 2584 if (idev->dead) { 2585 read_unlock_bh(&idev->lock); 2586 goto out; 2587 } 2588 spin_lock_bh(&ifp->lock); 2589 if (ifp->probes == 0) { 2590 /* 2591 * DAD was successful 2592 */ 2593 2594 ifp->flags &= ~IFA_F_TENTATIVE; 2595 spin_unlock_bh(&ifp->lock); 2596 read_unlock_bh(&idev->lock); 2597 2598 addrconf_dad_completed(ifp); 2599 2600 goto out; 2601 } 2602 2603 ifp->probes--; 2604 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2605 spin_unlock_bh(&ifp->lock); 2606 read_unlock_bh(&idev->lock); 2607 2608 /* send a neighbour solicitation for our addr */ 2609 memset(&unspec, 0, sizeof(unspec)); 2610 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2611 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2612 out: 2613 in6_ifa_put(ifp); 2614 } 2615 2616 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2617 { 2618 struct net_device * dev = ifp->idev->dev; 2619 2620 /* 2621 * Configure the address for reception. Now it is valid. 2622 */ 2623 2624 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2625 2626 /* If added prefix is link local and forwarding is off, 2627 start sending router solicitations. 2628 */ 2629 2630 if (ifp->idev->cnf.forwarding == 0 && 2631 ifp->idev->cnf.rtr_solicits > 0 && 2632 (dev->flags&IFF_LOOPBACK) == 0 && 2633 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2634 struct in6_addr all_routers; 2635 2636 ipv6_addr_all_routers(&all_routers); 2637 2638 /* 2639 * If a host as already performed a random delay 2640 * [...] as part of DAD [...] there is no need 2641 * to delay again before sending the first RS 2642 */ 2643 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2644 2645 spin_lock_bh(&ifp->lock); 2646 ifp->probes = 1; 2647 ifp->idev->if_flags |= IF_RS_SENT; 2648 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2649 spin_unlock_bh(&ifp->lock); 2650 } 2651 } 2652 2653 static void addrconf_dad_run(struct inet6_dev *idev) { 2654 struct inet6_ifaddr *ifp; 2655 2656 read_lock_bh(&idev->lock); 2657 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2658 spin_lock_bh(&ifp->lock); 2659 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2660 spin_unlock_bh(&ifp->lock); 2661 continue; 2662 } 2663 spin_unlock_bh(&ifp->lock); 2664 addrconf_dad_kick(ifp); 2665 } 2666 read_unlock_bh(&idev->lock); 2667 } 2668 2669 #ifdef CONFIG_PROC_FS 2670 struct if6_iter_state { 2671 int bucket; 2672 }; 2673 2674 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2675 { 2676 struct inet6_ifaddr *ifa = NULL; 2677 struct if6_iter_state *state = seq->private; 2678 2679 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2680 ifa = inet6_addr_lst[state->bucket]; 2681 if (ifa) 2682 break; 2683 } 2684 return ifa; 2685 } 2686 2687 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2688 { 2689 struct if6_iter_state *state = seq->private; 2690 2691 ifa = ifa->lst_next; 2692 try_again: 2693 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2694 ifa = inet6_addr_lst[state->bucket]; 2695 goto try_again; 2696 } 2697 return ifa; 2698 } 2699 2700 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2701 { 2702 struct inet6_ifaddr *ifa = if6_get_first(seq); 2703 2704 if (ifa) 2705 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2706 --pos; 2707 return pos ? NULL : ifa; 2708 } 2709 2710 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2711 { 2712 read_lock_bh(&addrconf_hash_lock); 2713 return if6_get_idx(seq, *pos); 2714 } 2715 2716 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2717 { 2718 struct inet6_ifaddr *ifa; 2719 2720 ifa = if6_get_next(seq, v); 2721 ++*pos; 2722 return ifa; 2723 } 2724 2725 static void if6_seq_stop(struct seq_file *seq, void *v) 2726 { 2727 read_unlock_bh(&addrconf_hash_lock); 2728 } 2729 2730 static int if6_seq_show(struct seq_file *seq, void *v) 2731 { 2732 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2733 seq_printf(seq, 2734 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2735 NIP6(ifp->addr), 2736 ifp->idev->dev->ifindex, 2737 ifp->prefix_len, 2738 ifp->scope, 2739 ifp->flags, 2740 ifp->idev->dev->name); 2741 return 0; 2742 } 2743 2744 static struct seq_operations if6_seq_ops = { 2745 .start = if6_seq_start, 2746 .next = if6_seq_next, 2747 .show = if6_seq_show, 2748 .stop = if6_seq_stop, 2749 }; 2750 2751 static int if6_seq_open(struct inode *inode, struct file *file) 2752 { 2753 struct seq_file *seq; 2754 int rc = -ENOMEM; 2755 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2756 2757 if (!s) 2758 goto out; 2759 2760 rc = seq_open(file, &if6_seq_ops); 2761 if (rc) 2762 goto out_kfree; 2763 2764 seq = file->private_data; 2765 seq->private = s; 2766 out: 2767 return rc; 2768 out_kfree: 2769 kfree(s); 2770 goto out; 2771 } 2772 2773 static struct file_operations if6_fops = { 2774 .owner = THIS_MODULE, 2775 .open = if6_seq_open, 2776 .read = seq_read, 2777 .llseek = seq_lseek, 2778 .release = seq_release_private, 2779 }; 2780 2781 int __init if6_proc_init(void) 2782 { 2783 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops)) 2784 return -ENOMEM; 2785 return 0; 2786 } 2787 2788 void if6_proc_exit(void) 2789 { 2790 proc_net_remove("if_inet6"); 2791 } 2792 #endif /* CONFIG_PROC_FS */ 2793 2794 #ifdef CONFIG_IPV6_MIP6 2795 /* Check if address is a home address configured on any interface. */ 2796 int ipv6_chk_home_addr(struct in6_addr *addr) 2797 { 2798 int ret = 0; 2799 struct inet6_ifaddr * ifp; 2800 u8 hash = ipv6_addr_hash(addr); 2801 read_lock_bh(&addrconf_hash_lock); 2802 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2803 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 && 2804 (ifp->flags & IFA_F_HOMEADDRESS)) { 2805 ret = 1; 2806 break; 2807 } 2808 } 2809 read_unlock_bh(&addrconf_hash_lock); 2810 return ret; 2811 } 2812 #endif 2813 2814 /* 2815 * Periodic address status verification 2816 */ 2817 2818 static void addrconf_verify(unsigned long foo) 2819 { 2820 struct inet6_ifaddr *ifp; 2821 unsigned long now, next; 2822 int i; 2823 2824 spin_lock_bh(&addrconf_verify_lock); 2825 now = jiffies; 2826 next = now + ADDR_CHECK_FREQUENCY; 2827 2828 del_timer(&addr_chk_timer); 2829 2830 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2831 2832 restart: 2833 read_lock(&addrconf_hash_lock); 2834 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2835 unsigned long age; 2836 #ifdef CONFIG_IPV6_PRIVACY 2837 unsigned long regen_advance; 2838 #endif 2839 2840 if (ifp->flags & IFA_F_PERMANENT) 2841 continue; 2842 2843 spin_lock(&ifp->lock); 2844 age = (now - ifp->tstamp) / HZ; 2845 2846 #ifdef CONFIG_IPV6_PRIVACY 2847 regen_advance = ifp->idev->cnf.regen_max_retry * 2848 ifp->idev->cnf.dad_transmits * 2849 ifp->idev->nd_parms->retrans_time / HZ; 2850 #endif 2851 2852 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2853 age >= ifp->valid_lft) { 2854 spin_unlock(&ifp->lock); 2855 in6_ifa_hold(ifp); 2856 read_unlock(&addrconf_hash_lock); 2857 ipv6_del_addr(ifp); 2858 goto restart; 2859 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2860 spin_unlock(&ifp->lock); 2861 continue; 2862 } else if (age >= ifp->prefered_lft) { 2863 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2864 int deprecate = 0; 2865 2866 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2867 deprecate = 1; 2868 ifp->flags |= IFA_F_DEPRECATED; 2869 } 2870 2871 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2872 next = ifp->tstamp + ifp->valid_lft * HZ; 2873 2874 spin_unlock(&ifp->lock); 2875 2876 if (deprecate) { 2877 in6_ifa_hold(ifp); 2878 read_unlock(&addrconf_hash_lock); 2879 2880 ipv6_ifa_notify(0, ifp); 2881 in6_ifa_put(ifp); 2882 goto restart; 2883 } 2884 #ifdef CONFIG_IPV6_PRIVACY 2885 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2886 !(ifp->flags&IFA_F_TENTATIVE)) { 2887 if (age >= ifp->prefered_lft - regen_advance) { 2888 struct inet6_ifaddr *ifpub = ifp->ifpub; 2889 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2890 next = ifp->tstamp + ifp->prefered_lft * HZ; 2891 if (!ifp->regen_count && ifpub) { 2892 ifp->regen_count++; 2893 in6_ifa_hold(ifp); 2894 in6_ifa_hold(ifpub); 2895 spin_unlock(&ifp->lock); 2896 read_unlock(&addrconf_hash_lock); 2897 spin_lock(&ifpub->lock); 2898 ifpub->regen_count = 0; 2899 spin_unlock(&ifpub->lock); 2900 ipv6_create_tempaddr(ifpub, ifp); 2901 in6_ifa_put(ifpub); 2902 in6_ifa_put(ifp); 2903 goto restart; 2904 } 2905 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2906 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2907 spin_unlock(&ifp->lock); 2908 #endif 2909 } else { 2910 /* ifp->prefered_lft <= ifp->valid_lft */ 2911 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2912 next = ifp->tstamp + ifp->prefered_lft * HZ; 2913 spin_unlock(&ifp->lock); 2914 } 2915 } 2916 read_unlock(&addrconf_hash_lock); 2917 } 2918 2919 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2920 add_timer(&addr_chk_timer); 2921 spin_unlock_bh(&addrconf_verify_lock); 2922 } 2923 2924 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 2925 { 2926 struct in6_addr *pfx = NULL; 2927 2928 if (addr) 2929 pfx = nla_data(addr); 2930 2931 if (local) { 2932 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 2933 pfx = NULL; 2934 else 2935 pfx = nla_data(local); 2936 } 2937 2938 return pfx; 2939 } 2940 2941 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = { 2942 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 2943 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 2944 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 2945 }; 2946 2947 static int 2948 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2949 { 2950 struct ifaddrmsg *ifm; 2951 struct nlattr *tb[IFA_MAX+1]; 2952 struct in6_addr *pfx; 2953 int err; 2954 2955 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 2956 if (err < 0) 2957 return err; 2958 2959 ifm = nlmsg_data(nlh); 2960 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 2961 if (pfx == NULL) 2962 return -EINVAL; 2963 2964 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 2965 } 2966 2967 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 2968 u32 prefered_lft, u32 valid_lft) 2969 { 2970 if (!valid_lft || (prefered_lft > valid_lft)) 2971 return -EINVAL; 2972 2973 if (valid_lft == INFINITY_LIFE_TIME) 2974 ifa_flags |= IFA_F_PERMANENT; 2975 else if (valid_lft >= 0x7FFFFFFF/HZ) 2976 valid_lft = 0x7FFFFFFF/HZ; 2977 2978 if (prefered_lft == 0) 2979 ifa_flags |= IFA_F_DEPRECATED; 2980 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 2981 (prefered_lft != INFINITY_LIFE_TIME)) 2982 prefered_lft = 0x7FFFFFFF/HZ; 2983 2984 spin_lock_bh(&ifp->lock); 2985 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 2986 ifp->tstamp = jiffies; 2987 ifp->valid_lft = valid_lft; 2988 ifp->prefered_lft = prefered_lft; 2989 2990 spin_unlock_bh(&ifp->lock); 2991 if (!(ifp->flags&IFA_F_TENTATIVE)) 2992 ipv6_ifa_notify(0, ifp); 2993 2994 addrconf_verify(0); 2995 2996 return 0; 2997 } 2998 2999 static int 3000 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3001 { 3002 struct ifaddrmsg *ifm; 3003 struct nlattr *tb[IFA_MAX+1]; 3004 struct in6_addr *pfx; 3005 struct inet6_ifaddr *ifa; 3006 struct net_device *dev; 3007 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3008 u8 ifa_flags; 3009 int err; 3010 3011 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3012 if (err < 0) 3013 return err; 3014 3015 ifm = nlmsg_data(nlh); 3016 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3017 if (pfx == NULL) 3018 return -EINVAL; 3019 3020 if (tb[IFA_CACHEINFO]) { 3021 struct ifa_cacheinfo *ci; 3022 3023 ci = nla_data(tb[IFA_CACHEINFO]); 3024 valid_lft = ci->ifa_valid; 3025 preferred_lft = ci->ifa_prefered; 3026 } else { 3027 preferred_lft = INFINITY_LIFE_TIME; 3028 valid_lft = INFINITY_LIFE_TIME; 3029 } 3030 3031 dev = __dev_get_by_index(ifm->ifa_index); 3032 if (dev == NULL) 3033 return -ENODEV; 3034 3035 /* We ignore other flags so far. */ 3036 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3037 3038 ifa = ipv6_get_ifaddr(pfx, dev, 1); 3039 if (ifa == NULL) { 3040 /* 3041 * It would be best to check for !NLM_F_CREATE here but 3042 * userspace alreay relies on not having to provide this. 3043 */ 3044 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 3045 ifa_flags, preferred_lft, valid_lft); 3046 } 3047 3048 if (nlh->nlmsg_flags & NLM_F_EXCL || 3049 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3050 err = -EEXIST; 3051 else 3052 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3053 3054 in6_ifa_put(ifa); 3055 3056 return err; 3057 } 3058 3059 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3060 u8 scope, int ifindex) 3061 { 3062 struct ifaddrmsg *ifm; 3063 3064 ifm = nlmsg_data(nlh); 3065 ifm->ifa_family = AF_INET6; 3066 ifm->ifa_prefixlen = prefixlen; 3067 ifm->ifa_flags = flags; 3068 ifm->ifa_scope = scope; 3069 ifm->ifa_index = ifindex; 3070 } 3071 3072 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3073 unsigned long tstamp, u32 preferred, u32 valid) 3074 { 3075 struct ifa_cacheinfo ci; 3076 3077 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3078 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3079 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3080 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3081 ci.ifa_prefered = preferred; 3082 ci.ifa_valid = valid; 3083 3084 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3085 } 3086 3087 static inline int rt_scope(int ifa_scope) 3088 { 3089 if (ifa_scope & IFA_HOST) 3090 return RT_SCOPE_HOST; 3091 else if (ifa_scope & IFA_LINK) 3092 return RT_SCOPE_LINK; 3093 else if (ifa_scope & IFA_SITE) 3094 return RT_SCOPE_SITE; 3095 else 3096 return RT_SCOPE_UNIVERSE; 3097 } 3098 3099 static inline int inet6_ifaddr_msgsize(void) 3100 { 3101 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3102 + nla_total_size(16) /* IFA_ADDRESS */ 3103 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3104 } 3105 3106 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3107 u32 pid, u32 seq, int event, unsigned int flags) 3108 { 3109 struct nlmsghdr *nlh; 3110 u32 preferred, valid; 3111 3112 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3113 if (nlh == NULL) 3114 return -ENOBUFS; 3115 3116 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3117 ifa->idev->dev->ifindex); 3118 3119 if (!(ifa->flags&IFA_F_PERMANENT)) { 3120 preferred = ifa->prefered_lft; 3121 valid = ifa->valid_lft; 3122 if (preferred != INFINITY_LIFE_TIME) { 3123 long tval = (jiffies - ifa->tstamp)/HZ; 3124 preferred -= tval; 3125 if (valid != INFINITY_LIFE_TIME) 3126 valid -= tval; 3127 } 3128 } else { 3129 preferred = INFINITY_LIFE_TIME; 3130 valid = INFINITY_LIFE_TIME; 3131 } 3132 3133 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3134 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3135 return nlmsg_cancel(skb, nlh); 3136 3137 return nlmsg_end(skb, nlh); 3138 } 3139 3140 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3141 u32 pid, u32 seq, int event, u16 flags) 3142 { 3143 struct nlmsghdr *nlh; 3144 u8 scope = RT_SCOPE_UNIVERSE; 3145 int ifindex = ifmca->idev->dev->ifindex; 3146 3147 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3148 scope = RT_SCOPE_SITE; 3149 3150 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3151 if (nlh == NULL) 3152 return -ENOBUFS; 3153 3154 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3155 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3156 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3157 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) 3158 return nlmsg_cancel(skb, nlh); 3159 3160 return nlmsg_end(skb, nlh); 3161 } 3162 3163 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3164 u32 pid, u32 seq, int event, unsigned int flags) 3165 { 3166 struct nlmsghdr *nlh; 3167 u8 scope = RT_SCOPE_UNIVERSE; 3168 int ifindex = ifaca->aca_idev->dev->ifindex; 3169 3170 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3171 scope = RT_SCOPE_SITE; 3172 3173 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3174 if (nlh == NULL) 3175 return -ENOBUFS; 3176 3177 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3178 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3179 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3180 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) 3181 return nlmsg_cancel(skb, nlh); 3182 3183 return nlmsg_end(skb, nlh); 3184 } 3185 3186 enum addr_type_t 3187 { 3188 UNICAST_ADDR, 3189 MULTICAST_ADDR, 3190 ANYCAST_ADDR, 3191 }; 3192 3193 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3194 enum addr_type_t type) 3195 { 3196 int idx, ip_idx; 3197 int s_idx, s_ip_idx; 3198 int err = 1; 3199 struct net_device *dev; 3200 struct inet6_dev *idev = NULL; 3201 struct inet6_ifaddr *ifa; 3202 struct ifmcaddr6 *ifmca; 3203 struct ifacaddr6 *ifaca; 3204 3205 s_idx = cb->args[0]; 3206 s_ip_idx = ip_idx = cb->args[1]; 3207 read_lock(&dev_base_lock); 3208 3209 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { 3210 if (idx < s_idx) 3211 continue; 3212 if (idx > s_idx) 3213 s_ip_idx = 0; 3214 ip_idx = 0; 3215 if ((idev = in6_dev_get(dev)) == NULL) 3216 continue; 3217 read_lock_bh(&idev->lock); 3218 switch (type) { 3219 case UNICAST_ADDR: 3220 /* unicast address incl. temp addr */ 3221 for (ifa = idev->addr_list; ifa; 3222 ifa = ifa->if_next, ip_idx++) { 3223 if (ip_idx < s_ip_idx) 3224 continue; 3225 if ((err = inet6_fill_ifaddr(skb, ifa, 3226 NETLINK_CB(cb->skb).pid, 3227 cb->nlh->nlmsg_seq, RTM_NEWADDR, 3228 NLM_F_MULTI)) <= 0) 3229 goto done; 3230 } 3231 break; 3232 case MULTICAST_ADDR: 3233 /* multicast address */ 3234 for (ifmca = idev->mc_list; ifmca; 3235 ifmca = ifmca->next, ip_idx++) { 3236 if (ip_idx < s_ip_idx) 3237 continue; 3238 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 3239 NETLINK_CB(cb->skb).pid, 3240 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 3241 NLM_F_MULTI)) <= 0) 3242 goto done; 3243 } 3244 break; 3245 case ANYCAST_ADDR: 3246 /* anycast address */ 3247 for (ifaca = idev->ac_list; ifaca; 3248 ifaca = ifaca->aca_next, ip_idx++) { 3249 if (ip_idx < s_ip_idx) 3250 continue; 3251 if ((err = inet6_fill_ifacaddr(skb, ifaca, 3252 NETLINK_CB(cb->skb).pid, 3253 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 3254 NLM_F_MULTI)) <= 0) 3255 goto done; 3256 } 3257 break; 3258 default: 3259 break; 3260 } 3261 read_unlock_bh(&idev->lock); 3262 in6_dev_put(idev); 3263 } 3264 done: 3265 if (err <= 0) { 3266 read_unlock_bh(&idev->lock); 3267 in6_dev_put(idev); 3268 } 3269 read_unlock(&dev_base_lock); 3270 cb->args[0] = idx; 3271 cb->args[1] = ip_idx; 3272 return skb->len; 3273 } 3274 3275 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3276 { 3277 enum addr_type_t type = UNICAST_ADDR; 3278 return inet6_dump_addr(skb, cb, type); 3279 } 3280 3281 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3282 { 3283 enum addr_type_t type = MULTICAST_ADDR; 3284 return inet6_dump_addr(skb, cb, type); 3285 } 3286 3287 3288 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3289 { 3290 enum addr_type_t type = ANYCAST_ADDR; 3291 return inet6_dump_addr(skb, cb, type); 3292 } 3293 3294 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3295 void *arg) 3296 { 3297 struct ifaddrmsg *ifm; 3298 struct nlattr *tb[IFA_MAX+1]; 3299 struct in6_addr *addr = NULL; 3300 struct net_device *dev = NULL; 3301 struct inet6_ifaddr *ifa; 3302 struct sk_buff *skb; 3303 int err; 3304 3305 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3306 if (err < 0) 3307 goto errout; 3308 3309 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3310 if (addr == NULL) { 3311 err = -EINVAL; 3312 goto errout; 3313 } 3314 3315 ifm = nlmsg_data(nlh); 3316 if (ifm->ifa_index) 3317 dev = __dev_get_by_index(ifm->ifa_index); 3318 3319 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) { 3320 err = -EADDRNOTAVAIL; 3321 goto errout; 3322 } 3323 3324 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3325 err = -ENOBUFS; 3326 goto errout_ifa; 3327 } 3328 3329 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3330 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3331 /* failure implies BUG in inet6_ifaddr_msgsize() */ 3332 BUG_ON(err < 0); 3333 3334 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); 3335 errout_ifa: 3336 in6_ifa_put(ifa); 3337 errout: 3338 return err; 3339 } 3340 3341 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3342 { 3343 struct sk_buff *skb; 3344 int err = -ENOBUFS; 3345 3346 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3347 if (skb == NULL) 3348 goto errout; 3349 3350 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3351 /* failure implies BUG in inet6_ifaddr_msgsize() */ 3352 BUG_ON(err < 0); 3353 3354 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3355 errout: 3356 if (err < 0) 3357 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3358 } 3359 3360 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf, 3361 __s32 *array, int bytes) 3362 { 3363 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3364 3365 memset(array, 0, bytes); 3366 array[DEVCONF_FORWARDING] = cnf->forwarding; 3367 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3368 array[DEVCONF_MTU6] = cnf->mtu6; 3369 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3370 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3371 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3372 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3373 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3374 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3375 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3376 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3377 #ifdef CONFIG_IPV6_PRIVACY 3378 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3379 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3380 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3381 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3382 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3383 #endif 3384 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3385 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3386 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3387 #ifdef CONFIG_IPV6_ROUTER_PREF 3388 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3389 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3390 #ifdef CONFIV_IPV6_ROUTE_INFO 3391 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3392 #endif 3393 #endif 3394 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3395 } 3396 3397 static inline size_t inet6_if_nlmsg_size(void) 3398 { 3399 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3400 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3401 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3402 + nla_total_size(4) /* IFLA_MTU */ 3403 + nla_total_size(4) /* IFLA_LINK */ 3404 + nla_total_size( /* IFLA_PROTINFO */ 3405 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3406 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3407 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3408 ); 3409 } 3410 3411 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3412 u32 pid, u32 seq, int event, unsigned int flags) 3413 { 3414 struct net_device *dev = idev->dev; 3415 struct nlattr *conf; 3416 struct ifinfomsg *hdr; 3417 struct nlmsghdr *nlh; 3418 void *protoinfo; 3419 struct ifla_cacheinfo ci; 3420 3421 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3422 if (nlh == NULL) 3423 return -ENOBUFS; 3424 3425 hdr = nlmsg_data(nlh); 3426 hdr->ifi_family = AF_INET6; 3427 hdr->__ifi_pad = 0; 3428 hdr->ifi_type = dev->type; 3429 hdr->ifi_index = dev->ifindex; 3430 hdr->ifi_flags = dev_get_flags(dev); 3431 hdr->ifi_change = 0; 3432 3433 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3434 3435 if (dev->addr_len) 3436 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3437 3438 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3439 if (dev->ifindex != dev->iflink) 3440 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3441 3442 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3443 if (protoinfo == NULL) 3444 goto nla_put_failure; 3445 3446 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3447 3448 ci.max_reasm_len = IPV6_MAXPLEN; 3449 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3450 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3451 ci.reachable_time = idev->nd_parms->reachable_time; 3452 ci.retrans_time = idev->nd_parms->retrans_time; 3453 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3454 3455 conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3456 if (conf == NULL) 3457 goto nla_put_failure; 3458 ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf)); 3459 3460 /* XXX - Statistics/MC not implemented */ 3461 3462 nla_nest_end(skb, protoinfo); 3463 return nlmsg_end(skb, nlh); 3464 3465 nla_put_failure: 3466 return nlmsg_cancel(skb, nlh); 3467 } 3468 3469 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3470 { 3471 int idx, err; 3472 int s_idx = cb->args[0]; 3473 struct net_device *dev; 3474 struct inet6_dev *idev; 3475 3476 read_lock(&dev_base_lock); 3477 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { 3478 if (idx < s_idx) 3479 continue; 3480 if ((idev = in6_dev_get(dev)) == NULL) 3481 continue; 3482 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3483 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3484 in6_dev_put(idev); 3485 if (err <= 0) 3486 break; 3487 } 3488 read_unlock(&dev_base_lock); 3489 cb->args[0] = idx; 3490 3491 return skb->len; 3492 } 3493 3494 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3495 { 3496 struct sk_buff *skb; 3497 int err = -ENOBUFS; 3498 3499 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3500 if (skb == NULL) 3501 goto errout; 3502 3503 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3504 /* failure implies BUG in inet6_if_nlmsg_size() */ 3505 BUG_ON(err < 0); 3506 3507 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3508 errout: 3509 if (err < 0) 3510 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3511 } 3512 3513 static inline size_t inet6_prefix_nlmsg_size(void) 3514 { 3515 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3516 + nla_total_size(sizeof(struct in6_addr)) 3517 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3518 } 3519 3520 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3521 struct prefix_info *pinfo, u32 pid, u32 seq, 3522 int event, unsigned int flags) 3523 { 3524 struct prefixmsg *pmsg; 3525 struct nlmsghdr *nlh; 3526 struct prefix_cacheinfo ci; 3527 3528 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3529 if (nlh == NULL) 3530 return -ENOBUFS; 3531 3532 pmsg = nlmsg_data(nlh); 3533 pmsg->prefix_family = AF_INET6; 3534 pmsg->prefix_pad1 = 0; 3535 pmsg->prefix_pad2 = 0; 3536 pmsg->prefix_ifindex = idev->dev->ifindex; 3537 pmsg->prefix_len = pinfo->prefix_len; 3538 pmsg->prefix_type = pinfo->type; 3539 pmsg->prefix_pad3 = 0; 3540 pmsg->prefix_flags = 0; 3541 if (pinfo->onlink) 3542 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3543 if (pinfo->autoconf) 3544 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3545 3546 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3547 3548 ci.preferred_time = ntohl(pinfo->prefered); 3549 ci.valid_time = ntohl(pinfo->valid); 3550 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3551 3552 return nlmsg_end(skb, nlh); 3553 3554 nla_put_failure: 3555 return nlmsg_cancel(skb, nlh); 3556 } 3557 3558 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3559 struct prefix_info *pinfo) 3560 { 3561 struct sk_buff *skb; 3562 int err = -ENOBUFS; 3563 3564 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3565 if (skb == NULL) 3566 goto errout; 3567 3568 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3569 /* failure implies BUG in inet6_prefix_nlmsg_size() */ 3570 BUG_ON(err < 0); 3571 3572 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3573 errout: 3574 if (err < 0) 3575 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err); 3576 } 3577 3578 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = { 3579 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, }, 3580 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, }, 3581 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, }, 3582 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr, 3583 .dumpit = inet6_dump_ifaddr, }, 3584 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, }, 3585 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, }, 3586 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, }, 3587 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, }, 3588 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute, 3589 .dumpit = inet6_dump_fib, }, 3590 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3591 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, }, 3592 #endif 3593 }; 3594 3595 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3596 { 3597 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3598 3599 switch (event) { 3600 case RTM_NEWADDR: 3601 ip6_ins_rt(ifp->rt); 3602 if (ifp->idev->cnf.forwarding) 3603 addrconf_join_anycast(ifp); 3604 break; 3605 case RTM_DELADDR: 3606 if (ifp->idev->cnf.forwarding) 3607 addrconf_leave_anycast(ifp); 3608 addrconf_leave_solict(ifp->idev, &ifp->addr); 3609 dst_hold(&ifp->rt->u.dst); 3610 if (ip6_del_rt(ifp->rt)) 3611 dst_free(&ifp->rt->u.dst); 3612 break; 3613 } 3614 } 3615 3616 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3617 { 3618 rcu_read_lock_bh(); 3619 if (likely(ifp->idev->dead == 0)) 3620 __ipv6_ifa_notify(event, ifp); 3621 rcu_read_unlock_bh(); 3622 } 3623 3624 #ifdef CONFIG_SYSCTL 3625 3626 static 3627 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3628 void __user *buffer, size_t *lenp, loff_t *ppos) 3629 { 3630 int *valp = ctl->data; 3631 int val = *valp; 3632 int ret; 3633 3634 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3635 3636 if (write && valp != &ipv6_devconf_dflt.forwarding) { 3637 if (valp != &ipv6_devconf.forwarding) { 3638 if ((!*valp) ^ (!val)) { 3639 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 3640 if (idev == NULL) 3641 return ret; 3642 dev_forward_change(idev); 3643 } 3644 } else { 3645 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; 3646 addrconf_forward_change(); 3647 } 3648 if (*valp) 3649 rt6_purge_dflt_routers(); 3650 } 3651 3652 return ret; 3653 } 3654 3655 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3656 int __user *name, int nlen, 3657 void __user *oldval, 3658 size_t __user *oldlenp, 3659 void __user *newval, size_t newlen, 3660 void **context) 3661 { 3662 int *valp = table->data; 3663 int new; 3664 3665 if (!newval || !newlen) 3666 return 0; 3667 if (newlen != sizeof(int)) 3668 return -EINVAL; 3669 if (get_user(new, (int __user *)newval)) 3670 return -EFAULT; 3671 if (new == *valp) 3672 return 0; 3673 if (oldval && oldlenp) { 3674 size_t len; 3675 if (get_user(len, oldlenp)) 3676 return -EFAULT; 3677 if (len) { 3678 if (len > table->maxlen) 3679 len = table->maxlen; 3680 if (copy_to_user(oldval, valp, len)) 3681 return -EFAULT; 3682 if (put_user(len, oldlenp)) 3683 return -EFAULT; 3684 } 3685 } 3686 3687 if (valp != &ipv6_devconf_dflt.forwarding) { 3688 if (valp != &ipv6_devconf.forwarding) { 3689 struct inet6_dev *idev = (struct inet6_dev *)table->extra1; 3690 int changed; 3691 if (unlikely(idev == NULL)) 3692 return -ENODEV; 3693 changed = (!*valp) ^ (!new); 3694 *valp = new; 3695 if (changed) 3696 dev_forward_change(idev); 3697 } else { 3698 *valp = new; 3699 addrconf_forward_change(); 3700 } 3701 3702 if (*valp) 3703 rt6_purge_dflt_routers(); 3704 } else 3705 *valp = new; 3706 3707 return 1; 3708 } 3709 3710 static struct addrconf_sysctl_table 3711 { 3712 struct ctl_table_header *sysctl_header; 3713 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3714 ctl_table addrconf_dev[2]; 3715 ctl_table addrconf_conf_dir[2]; 3716 ctl_table addrconf_proto_dir[2]; 3717 ctl_table addrconf_root_dir[2]; 3718 } addrconf_sysctl __read_mostly = { 3719 .sysctl_header = NULL, 3720 .addrconf_vars = { 3721 { 3722 .ctl_name = NET_IPV6_FORWARDING, 3723 .procname = "forwarding", 3724 .data = &ipv6_devconf.forwarding, 3725 .maxlen = sizeof(int), 3726 .mode = 0644, 3727 .proc_handler = &addrconf_sysctl_forward, 3728 .strategy = &addrconf_sysctl_forward_strategy, 3729 }, 3730 { 3731 .ctl_name = NET_IPV6_HOP_LIMIT, 3732 .procname = "hop_limit", 3733 .data = &ipv6_devconf.hop_limit, 3734 .maxlen = sizeof(int), 3735 .mode = 0644, 3736 .proc_handler = proc_dointvec, 3737 }, 3738 { 3739 .ctl_name = NET_IPV6_MTU, 3740 .procname = "mtu", 3741 .data = &ipv6_devconf.mtu6, 3742 .maxlen = sizeof(int), 3743 .mode = 0644, 3744 .proc_handler = &proc_dointvec, 3745 }, 3746 { 3747 .ctl_name = NET_IPV6_ACCEPT_RA, 3748 .procname = "accept_ra", 3749 .data = &ipv6_devconf.accept_ra, 3750 .maxlen = sizeof(int), 3751 .mode = 0644, 3752 .proc_handler = &proc_dointvec, 3753 }, 3754 { 3755 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3756 .procname = "accept_redirects", 3757 .data = &ipv6_devconf.accept_redirects, 3758 .maxlen = sizeof(int), 3759 .mode = 0644, 3760 .proc_handler = &proc_dointvec, 3761 }, 3762 { 3763 .ctl_name = NET_IPV6_AUTOCONF, 3764 .procname = "autoconf", 3765 .data = &ipv6_devconf.autoconf, 3766 .maxlen = sizeof(int), 3767 .mode = 0644, 3768 .proc_handler = &proc_dointvec, 3769 }, 3770 { 3771 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3772 .procname = "dad_transmits", 3773 .data = &ipv6_devconf.dad_transmits, 3774 .maxlen = sizeof(int), 3775 .mode = 0644, 3776 .proc_handler = &proc_dointvec, 3777 }, 3778 { 3779 .ctl_name = NET_IPV6_RTR_SOLICITS, 3780 .procname = "router_solicitations", 3781 .data = &ipv6_devconf.rtr_solicits, 3782 .maxlen = sizeof(int), 3783 .mode = 0644, 3784 .proc_handler = &proc_dointvec, 3785 }, 3786 { 3787 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3788 .procname = "router_solicitation_interval", 3789 .data = &ipv6_devconf.rtr_solicit_interval, 3790 .maxlen = sizeof(int), 3791 .mode = 0644, 3792 .proc_handler = &proc_dointvec_jiffies, 3793 .strategy = &sysctl_jiffies, 3794 }, 3795 { 3796 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3797 .procname = "router_solicitation_delay", 3798 .data = &ipv6_devconf.rtr_solicit_delay, 3799 .maxlen = sizeof(int), 3800 .mode = 0644, 3801 .proc_handler = &proc_dointvec_jiffies, 3802 .strategy = &sysctl_jiffies, 3803 }, 3804 { 3805 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3806 .procname = "force_mld_version", 3807 .data = &ipv6_devconf.force_mld_version, 3808 .maxlen = sizeof(int), 3809 .mode = 0644, 3810 .proc_handler = &proc_dointvec, 3811 }, 3812 #ifdef CONFIG_IPV6_PRIVACY 3813 { 3814 .ctl_name = NET_IPV6_USE_TEMPADDR, 3815 .procname = "use_tempaddr", 3816 .data = &ipv6_devconf.use_tempaddr, 3817 .maxlen = sizeof(int), 3818 .mode = 0644, 3819 .proc_handler = &proc_dointvec, 3820 }, 3821 { 3822 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3823 .procname = "temp_valid_lft", 3824 .data = &ipv6_devconf.temp_valid_lft, 3825 .maxlen = sizeof(int), 3826 .mode = 0644, 3827 .proc_handler = &proc_dointvec, 3828 }, 3829 { 3830 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3831 .procname = "temp_prefered_lft", 3832 .data = &ipv6_devconf.temp_prefered_lft, 3833 .maxlen = sizeof(int), 3834 .mode = 0644, 3835 .proc_handler = &proc_dointvec, 3836 }, 3837 { 3838 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3839 .procname = "regen_max_retry", 3840 .data = &ipv6_devconf.regen_max_retry, 3841 .maxlen = sizeof(int), 3842 .mode = 0644, 3843 .proc_handler = &proc_dointvec, 3844 }, 3845 { 3846 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3847 .procname = "max_desync_factor", 3848 .data = &ipv6_devconf.max_desync_factor, 3849 .maxlen = sizeof(int), 3850 .mode = 0644, 3851 .proc_handler = &proc_dointvec, 3852 }, 3853 #endif 3854 { 3855 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3856 .procname = "max_addresses", 3857 .data = &ipv6_devconf.max_addresses, 3858 .maxlen = sizeof(int), 3859 .mode = 0644, 3860 .proc_handler = &proc_dointvec, 3861 }, 3862 { 3863 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 3864 .procname = "accept_ra_defrtr", 3865 .data = &ipv6_devconf.accept_ra_defrtr, 3866 .maxlen = sizeof(int), 3867 .mode = 0644, 3868 .proc_handler = &proc_dointvec, 3869 }, 3870 { 3871 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 3872 .procname = "accept_ra_pinfo", 3873 .data = &ipv6_devconf.accept_ra_pinfo, 3874 .maxlen = sizeof(int), 3875 .mode = 0644, 3876 .proc_handler = &proc_dointvec, 3877 }, 3878 #ifdef CONFIG_IPV6_ROUTER_PREF 3879 { 3880 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 3881 .procname = "accept_ra_rtr_pref", 3882 .data = &ipv6_devconf.accept_ra_rtr_pref, 3883 .maxlen = sizeof(int), 3884 .mode = 0644, 3885 .proc_handler = &proc_dointvec, 3886 }, 3887 { 3888 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 3889 .procname = "router_probe_interval", 3890 .data = &ipv6_devconf.rtr_probe_interval, 3891 .maxlen = sizeof(int), 3892 .mode = 0644, 3893 .proc_handler = &proc_dointvec_jiffies, 3894 .strategy = &sysctl_jiffies, 3895 }, 3896 #ifdef CONFIV_IPV6_ROUTE_INFO 3897 { 3898 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 3899 .procname = "accept_ra_rt_info_max_plen", 3900 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 3901 .maxlen = sizeof(int), 3902 .mode = 0644, 3903 .proc_handler = &proc_dointvec, 3904 }, 3905 #endif 3906 #endif 3907 { 3908 .ctl_name = NET_IPV6_PROXY_NDP, 3909 .procname = "proxy_ndp", 3910 .data = &ipv6_devconf.proxy_ndp, 3911 .maxlen = sizeof(int), 3912 .mode = 0644, 3913 .proc_handler = &proc_dointvec, 3914 }, 3915 { 3916 .ctl_name = 0, /* sentinel */ 3917 } 3918 }, 3919 .addrconf_dev = { 3920 { 3921 .ctl_name = NET_PROTO_CONF_ALL, 3922 .procname = "all", 3923 .mode = 0555, 3924 .child = addrconf_sysctl.addrconf_vars, 3925 }, 3926 { 3927 .ctl_name = 0, /* sentinel */ 3928 } 3929 }, 3930 .addrconf_conf_dir = { 3931 { 3932 .ctl_name = NET_IPV6_CONF, 3933 .procname = "conf", 3934 .mode = 0555, 3935 .child = addrconf_sysctl.addrconf_dev, 3936 }, 3937 { 3938 .ctl_name = 0, /* sentinel */ 3939 } 3940 }, 3941 .addrconf_proto_dir = { 3942 { 3943 .ctl_name = NET_IPV6, 3944 .procname = "ipv6", 3945 .mode = 0555, 3946 .child = addrconf_sysctl.addrconf_conf_dir, 3947 }, 3948 { 3949 .ctl_name = 0, /* sentinel */ 3950 } 3951 }, 3952 .addrconf_root_dir = { 3953 { 3954 .ctl_name = CTL_NET, 3955 .procname = "net", 3956 .mode = 0555, 3957 .child = addrconf_sysctl.addrconf_proto_dir, 3958 }, 3959 { 3960 .ctl_name = 0, /* sentinel */ 3961 } 3962 }, 3963 }; 3964 3965 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) 3966 { 3967 int i; 3968 struct net_device *dev = idev ? idev->dev : NULL; 3969 struct addrconf_sysctl_table *t; 3970 char *dev_name = NULL; 3971 3972 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 3973 if (t == NULL) 3974 return; 3975 for (i=0; t->addrconf_vars[i].data; i++) { 3976 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 3977 t->addrconf_vars[i].de = NULL; 3978 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 3979 } 3980 if (dev) { 3981 dev_name = dev->name; 3982 t->addrconf_dev[0].ctl_name = dev->ifindex; 3983 } else { 3984 dev_name = "default"; 3985 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 3986 } 3987 3988 /* 3989 * Make a copy of dev_name, because '.procname' is regarded as const 3990 * by sysctl and we wouldn't want anyone to change it under our feet 3991 * (see SIOCSIFNAME). 3992 */ 3993 dev_name = kstrdup(dev_name, GFP_KERNEL); 3994 if (!dev_name) 3995 goto free; 3996 3997 t->addrconf_dev[0].procname = dev_name; 3998 3999 t->addrconf_dev[0].child = t->addrconf_vars; 4000 t->addrconf_dev[0].de = NULL; 4001 t->addrconf_conf_dir[0].child = t->addrconf_dev; 4002 t->addrconf_conf_dir[0].de = NULL; 4003 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; 4004 t->addrconf_proto_dir[0].de = NULL; 4005 t->addrconf_root_dir[0].child = t->addrconf_proto_dir; 4006 t->addrconf_root_dir[0].de = NULL; 4007 4008 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0); 4009 if (t->sysctl_header == NULL) 4010 goto free_procname; 4011 else 4012 p->sysctl = t; 4013 return; 4014 4015 /* error path */ 4016 free_procname: 4017 kfree(dev_name); 4018 free: 4019 kfree(t); 4020 4021 return; 4022 } 4023 4024 static void addrconf_sysctl_unregister(struct ipv6_devconf *p) 4025 { 4026 if (p->sysctl) { 4027 struct addrconf_sysctl_table *t = p->sysctl; 4028 p->sysctl = NULL; 4029 unregister_sysctl_table(t->sysctl_header); 4030 kfree(t->addrconf_dev[0].procname); 4031 kfree(t); 4032 } 4033 } 4034 4035 4036 #endif 4037 4038 /* 4039 * Device notifier 4040 */ 4041 4042 int register_inet6addr_notifier(struct notifier_block *nb) 4043 { 4044 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4045 } 4046 4047 int unregister_inet6addr_notifier(struct notifier_block *nb) 4048 { 4049 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4050 } 4051 4052 /* 4053 * Init / cleanup code 4054 */ 4055 4056 int __init addrconf_init(void) 4057 { 4058 int err = 0; 4059 4060 /* The addrconf netdev notifier requires that loopback_dev 4061 * has it's ipv6 private information allocated and setup 4062 * before it can bring up and give link-local addresses 4063 * to other devices which are up. 4064 * 4065 * Unfortunately, loopback_dev is not necessarily the first 4066 * entry in the global dev_base list of net devices. In fact, 4067 * it is likely to be the very last entry on that list. 4068 * So this causes the notifier registry below to try and 4069 * give link-local addresses to all devices besides loopback_dev 4070 * first, then loopback_dev, which cases all the non-loopback_dev 4071 * devices to fail to get a link-local address. 4072 * 4073 * So, as a temporary fix, allocate the ipv6 structure for 4074 * loopback_dev first by hand. 4075 * Longer term, all of the dependencies ipv6 has upon the loopback 4076 * device and it being up should be removed. 4077 */ 4078 rtnl_lock(); 4079 if (!ipv6_add_dev(&loopback_dev)) 4080 err = -ENOMEM; 4081 rtnl_unlock(); 4082 if (err) 4083 return err; 4084 4085 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev); 4086 4087 register_netdevice_notifier(&ipv6_dev_notf); 4088 4089 addrconf_verify(0); 4090 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table; 4091 #ifdef CONFIG_SYSCTL 4092 addrconf_sysctl.sysctl_header = 4093 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0); 4094 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); 4095 #endif 4096 4097 return 0; 4098 } 4099 4100 void __exit addrconf_cleanup(void) 4101 { 4102 struct net_device *dev; 4103 struct inet6_dev *idev; 4104 struct inet6_ifaddr *ifa; 4105 int i; 4106 4107 unregister_netdevice_notifier(&ipv6_dev_notf); 4108 4109 rtnetlink_links[PF_INET6] = NULL; 4110 #ifdef CONFIG_SYSCTL 4111 addrconf_sysctl_unregister(&ipv6_devconf_dflt); 4112 addrconf_sysctl_unregister(&ipv6_devconf); 4113 #endif 4114 4115 rtnl_lock(); 4116 4117 /* 4118 * clean dev list. 4119 */ 4120 4121 for (dev=dev_base; dev; dev=dev->next) { 4122 if ((idev = __in6_dev_get(dev)) == NULL) 4123 continue; 4124 addrconf_ifdown(dev, 1); 4125 } 4126 addrconf_ifdown(&loopback_dev, 2); 4127 4128 /* 4129 * Check hash table. 4130 */ 4131 4132 write_lock_bh(&addrconf_hash_lock); 4133 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4134 for (ifa=inet6_addr_lst[i]; ifa; ) { 4135 struct inet6_ifaddr *bifa; 4136 4137 bifa = ifa; 4138 ifa = ifa->lst_next; 4139 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4140 /* Do not free it; something is wrong. 4141 Now we can investigate it with debugger. 4142 */ 4143 } 4144 } 4145 write_unlock_bh(&addrconf_hash_lock); 4146 4147 del_timer(&addr_chk_timer); 4148 4149 rtnl_unlock(); 4150 4151 #ifdef CONFIG_PROC_FS 4152 proc_net_remove("if_inet6"); 4153 #endif 4154 } 4155