1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 /* 18 * Changes: 19 * 20 * Janos Farkas : delete timer on ifdown 21 * <chexum@bankinf.banki.hu> 22 * Andi Kleen : kill double kfree on module 23 * unload. 24 * Maciej W. Rozycki : FDDI support 25 * sekiya@USAGI : Don't send too many RS 26 * packets. 27 * yoshfuji@USAGI : Fixed interval between DAD 28 * packets. 29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 30 * address validation timer. 31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 32 * support. 33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 34 * address on a same interface. 35 * YOSHIFUJI Hideaki @USAGI : ARCnet support 36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 37 * seq_file. 38 * YOSHIFUJI Hideaki @USAGI : improved source address 39 * selection; consider scope, 40 * status etc. 41 */ 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/socket.h> 46 #include <linux/sockios.h> 47 #include <linux/net.h> 48 #include <linux/in6.h> 49 #include <linux/netdevice.h> 50 #include <linux/if_addr.h> 51 #include <linux/if_arp.h> 52 #include <linux/if_arcnet.h> 53 #include <linux/if_infiniband.h> 54 #include <linux/route.h> 55 #include <linux/inetdevice.h> 56 #include <linux/init.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/sock.h> 66 #include <net/snmp.h> 67 68 #include <net/ipv6.h> 69 #include <net/protocol.h> 70 #include <net/ndisc.h> 71 #include <net/ip6_route.h> 72 #include <net/addrconf.h> 73 #include <net/tcp.h> 74 #include <net/ip.h> 75 #include <net/netlink.h> 76 #include <linux/if_tunnel.h> 77 #include <linux/rtnetlink.h> 78 79 #ifdef CONFIG_IPV6_PRIVACY 80 #include <linux/random.h> 81 #endif 82 83 #include <asm/uaccess.h> 84 85 #include <linux/proc_fs.h> 86 #include <linux/seq_file.h> 87 88 /* Set to 3 to get tracing... */ 89 #define ACONF_DEBUG 2 90 91 #if ACONF_DEBUG >= 3 92 #define ADBG(x) printk x 93 #else 94 #define ADBG(x) 95 #endif 96 97 #define INFINITY_LIFE_TIME 0xFFFFFFFF 98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 99 100 #ifdef CONFIG_SYSCTL 101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p); 102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p); 103 #endif 104 105 #ifdef CONFIG_IPV6_PRIVACY 106 static int __ipv6_regen_rndid(struct inet6_dev *idev); 107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 108 static void ipv6_regen_rndid(unsigned long data); 109 110 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 111 #endif 112 113 static int ipv6_count_addresses(struct inet6_dev *idev); 114 115 /* 116 * Configured unicast address hash table 117 */ 118 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 119 static DEFINE_RWLOCK(addrconf_hash_lock); 120 121 static void addrconf_verify(unsigned long); 122 123 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 124 static DEFINE_SPINLOCK(addrconf_verify_lock); 125 126 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 128 129 static int addrconf_ifdown(struct net_device *dev, int how); 130 131 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 132 static void addrconf_dad_timer(unsigned long data); 133 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 134 static void addrconf_dad_run(struct inet6_dev *idev); 135 static void addrconf_rs_timer(unsigned long data); 136 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 137 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 138 139 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 140 struct prefix_info *pinfo); 141 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); 142 143 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 144 145 struct ipv6_devconf ipv6_devconf __read_mostly = { 146 .forwarding = 0, 147 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 148 .mtu6 = IPV6_MIN_MTU, 149 .accept_ra = 1, 150 .accept_redirects = 1, 151 .autoconf = 1, 152 .force_mld_version = 0, 153 .dad_transmits = 1, 154 .rtr_solicits = MAX_RTR_SOLICITATIONS, 155 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 156 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 157 #ifdef CONFIG_IPV6_PRIVACY 158 .use_tempaddr = 0, 159 .temp_valid_lft = TEMP_VALID_LIFETIME, 160 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 161 .regen_max_retry = REGEN_MAX_RETRY, 162 .max_desync_factor = MAX_DESYNC_FACTOR, 163 #endif 164 .max_addresses = IPV6_MAX_ADDRESSES, 165 .accept_ra_defrtr = 1, 166 .accept_ra_pinfo = 1, 167 #ifdef CONFIG_IPV6_ROUTER_PREF 168 .accept_ra_rtr_pref = 1, 169 .rtr_probe_interval = 60 * HZ, 170 #ifdef CONFIG_IPV6_ROUTE_INFO 171 .accept_ra_rt_info_max_plen = 0, 172 #endif 173 #endif 174 .proxy_ndp = 0, 175 }; 176 177 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 178 .forwarding = 0, 179 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 180 .mtu6 = IPV6_MIN_MTU, 181 .accept_ra = 1, 182 .accept_redirects = 1, 183 .autoconf = 1, 184 .dad_transmits = 1, 185 .rtr_solicits = MAX_RTR_SOLICITATIONS, 186 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 187 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 188 #ifdef CONFIG_IPV6_PRIVACY 189 .use_tempaddr = 0, 190 .temp_valid_lft = TEMP_VALID_LIFETIME, 191 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 192 .regen_max_retry = REGEN_MAX_RETRY, 193 .max_desync_factor = MAX_DESYNC_FACTOR, 194 #endif 195 .max_addresses = IPV6_MAX_ADDRESSES, 196 .accept_ra_defrtr = 1, 197 .accept_ra_pinfo = 1, 198 #ifdef CONFIG_IPV6_ROUTER_PREF 199 .accept_ra_rtr_pref = 1, 200 .rtr_probe_interval = 60 * HZ, 201 #ifdef CONFIG_IPV6_ROUTE_INFO 202 .accept_ra_rt_info_max_plen = 0, 203 #endif 204 #endif 205 .proxy_ndp = 0, 206 }; 207 208 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 209 #if 0 210 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 211 #endif 212 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 213 214 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16) 215 216 static inline unsigned ipv6_addr_scope2type(unsigned scope) 217 { 218 switch(scope) { 219 case IPV6_ADDR_SCOPE_NODELOCAL: 220 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) | 221 IPV6_ADDR_LOOPBACK); 222 case IPV6_ADDR_SCOPE_LINKLOCAL: 223 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) | 224 IPV6_ADDR_LINKLOCAL); 225 case IPV6_ADDR_SCOPE_SITELOCAL: 226 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) | 227 IPV6_ADDR_SITELOCAL); 228 } 229 return IPV6_ADDR_SCOPE_TYPE(scope); 230 } 231 232 int __ipv6_addr_type(const struct in6_addr *addr) 233 { 234 __be32 st; 235 236 st = addr->s6_addr32[0]; 237 238 /* Consider all addresses with the first three bits different of 239 000 and 111 as unicasts. 240 */ 241 if ((st & htonl(0xE0000000)) != htonl(0x00000000) && 242 (st & htonl(0xE0000000)) != htonl(0xE0000000)) 243 return (IPV6_ADDR_UNICAST | 244 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); 245 246 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) { 247 /* multicast */ 248 /* addr-select 3.1 */ 249 return (IPV6_ADDR_MULTICAST | 250 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr))); 251 } 252 253 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000)) 254 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 255 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */ 256 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000)) 257 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST | 258 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */ 259 260 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) { 261 if (addr->s6_addr32[2] == 0) { 262 if (addr->s6_addr32[3] == 0) 263 return IPV6_ADDR_ANY; 264 265 if (addr->s6_addr32[3] == htonl(0x00000001)) 266 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST | 267 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */ 268 269 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST | 270 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 271 } 272 273 if (addr->s6_addr32[2] == htonl(0x0000ffff)) 274 return (IPV6_ADDR_MAPPED | 275 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 276 } 277 278 return (IPV6_ADDR_RESERVED | 279 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */ 280 } 281 282 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 283 { 284 if (del_timer(&ifp->timer)) 285 __in6_ifa_put(ifp); 286 } 287 288 enum addrconf_timer_t 289 { 290 AC_NONE, 291 AC_DAD, 292 AC_RS, 293 }; 294 295 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 296 enum addrconf_timer_t what, 297 unsigned long when) 298 { 299 if (!del_timer(&ifp->timer)) 300 in6_ifa_hold(ifp); 301 302 switch (what) { 303 case AC_DAD: 304 ifp->timer.function = addrconf_dad_timer; 305 break; 306 case AC_RS: 307 ifp->timer.function = addrconf_rs_timer; 308 break; 309 default:; 310 } 311 ifp->timer.expires = jiffies + when; 312 add_timer(&ifp->timer); 313 } 314 315 /* Nobody refers to this device, we may destroy it. */ 316 317 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 318 { 319 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 320 kfree(idev); 321 } 322 323 void in6_dev_finish_destroy(struct inet6_dev *idev) 324 { 325 struct net_device *dev = idev->dev; 326 BUG_TRAP(idev->addr_list==NULL); 327 BUG_TRAP(idev->mc_list==NULL); 328 #ifdef NET_REFCNT_DEBUG 329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 330 #endif 331 dev_put(dev); 332 if (!idev->dead) { 333 printk("Freeing alive inet6 device %p\n", idev); 334 return; 335 } 336 snmp6_free_dev(idev); 337 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 338 } 339 340 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 341 { 342 struct inet6_dev *ndev; 343 struct in6_addr maddr; 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; 415 416 417 ipv6_mc_init_dev(ndev); 418 ndev->tstamp = jiffies; 419 #ifdef CONFIG_SYSCTL 420 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 421 NET_IPV6_NEIGH, "ipv6", 422 &ndisc_ifinfo_sysctl_change, 423 NULL); 424 addrconf_sysctl_register(ndev, &ndev->cnf); 425 #endif 426 /* protected by rtnl_lock */ 427 rcu_assign_pointer(dev->ip6_ptr, ndev); 428 429 /* Join all-node multicast group */ 430 ipv6_addr_all_nodes(&maddr); 431 ipv6_dev_mc_inc(dev, &maddr); 432 433 return ndev; 434 } 435 436 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 437 { 438 struct inet6_dev *idev; 439 440 ASSERT_RTNL(); 441 442 if ((idev = __in6_dev_get(dev)) == NULL) { 443 if ((idev = ipv6_add_dev(dev)) == NULL) 444 return NULL; 445 } 446 447 if (dev->flags&IFF_UP) 448 ipv6_mc_up(idev); 449 return idev; 450 } 451 452 #ifdef CONFIG_SYSCTL 453 static void dev_forward_change(struct inet6_dev *idev) 454 { 455 struct net_device *dev; 456 struct inet6_ifaddr *ifa; 457 struct in6_addr addr; 458 459 if (!idev) 460 return; 461 dev = idev->dev; 462 if (dev && (dev->flags & IFF_MULTICAST)) { 463 ipv6_addr_all_routers(&addr); 464 465 if (idev->cnf.forwarding) 466 ipv6_dev_mc_inc(dev, &addr); 467 else 468 ipv6_dev_mc_dec(dev, &addr); 469 } 470 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 471 if (idev->cnf.forwarding) 472 addrconf_join_anycast(ifa); 473 else 474 addrconf_leave_anycast(ifa); 475 } 476 } 477 478 479 static void addrconf_forward_change(void) 480 { 481 struct net_device *dev; 482 struct inet6_dev *idev; 483 484 read_lock(&dev_base_lock); 485 for (dev=dev_base; dev; dev=dev->next) { 486 rcu_read_lock(); 487 idev = __in6_dev_get(dev); 488 if (idev) { 489 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); 490 idev->cnf.forwarding = ipv6_devconf.forwarding; 491 if (changed) 492 dev_forward_change(idev); 493 } 494 rcu_read_unlock(); 495 } 496 read_unlock(&dev_base_lock); 497 } 498 #endif 499 500 /* Nobody refers to this ifaddr, destroy it */ 501 502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 503 { 504 BUG_TRAP(ifp->if_next==NULL); 505 BUG_TRAP(ifp->lst_next==NULL); 506 #ifdef NET_REFCNT_DEBUG 507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 508 #endif 509 510 in6_dev_put(ifp->idev); 511 512 if (del_timer(&ifp->timer)) 513 printk("Timer is still running, when freeing ifa=%p\n", ifp); 514 515 if (!ifp->dead) { 516 printk("Freeing alive inet6 address %p\n", ifp); 517 return; 518 } 519 dst_release(&ifp->rt->u.dst); 520 521 kfree(ifp); 522 } 523 524 static void 525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 526 { 527 struct inet6_ifaddr *ifa, **ifap; 528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 529 530 /* 531 * Each device address list is sorted in order of scope - 532 * global before linklocal. 533 */ 534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 535 ifap = &ifa->if_next) { 536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 537 break; 538 } 539 540 ifp->if_next = *ifap; 541 *ifap = ifp; 542 } 543 544 /* On success it returns ifp with increased reference count */ 545 546 static struct inet6_ifaddr * 547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 548 int scope, u32 flags) 549 { 550 struct inet6_ifaddr *ifa = NULL; 551 struct rt6_info *rt; 552 int hash; 553 int err = 0; 554 555 rcu_read_lock_bh(); 556 if (idev->dead) { 557 err = -ENODEV; /*XXX*/ 558 goto out2; 559 } 560 561 write_lock(&addrconf_hash_lock); 562 563 /* Ignore adding duplicate addresses on an interface */ 564 if (ipv6_chk_same_addr(addr, idev->dev)) { 565 ADBG(("ipv6_add_addr: already assigned\n")); 566 err = -EEXIST; 567 goto out; 568 } 569 570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 571 572 if (ifa == NULL) { 573 ADBG(("ipv6_add_addr: malloc failed\n")); 574 err = -ENOBUFS; 575 goto out; 576 } 577 578 rt = addrconf_dst_alloc(idev, addr, 0); 579 if (IS_ERR(rt)) { 580 err = PTR_ERR(rt); 581 goto out; 582 } 583 584 ipv6_addr_copy(&ifa->addr, addr); 585 586 spin_lock_init(&ifa->lock); 587 init_timer(&ifa->timer); 588 ifa->timer.data = (unsigned long) ifa; 589 ifa->scope = scope; 590 ifa->prefix_len = pfxlen; 591 ifa->flags = flags | IFA_F_TENTATIVE; 592 ifa->cstamp = ifa->tstamp = jiffies; 593 594 ifa->rt = rt; 595 596 ifa->idev = idev; 597 in6_dev_hold(idev); 598 /* For caller */ 599 in6_ifa_hold(ifa); 600 601 /* Add to big hash table */ 602 hash = ipv6_addr_hash(addr); 603 604 ifa->lst_next = inet6_addr_lst[hash]; 605 inet6_addr_lst[hash] = ifa; 606 in6_ifa_hold(ifa); 607 write_unlock(&addrconf_hash_lock); 608 609 write_lock(&idev->lock); 610 /* Add to inet6_dev unicast addr list. */ 611 ipv6_link_dev_addr(idev, ifa); 612 613 #ifdef CONFIG_IPV6_PRIVACY 614 if (ifa->flags&IFA_F_TEMPORARY) { 615 ifa->tmp_next = idev->tempaddr_list; 616 idev->tempaddr_list = ifa; 617 in6_ifa_hold(ifa); 618 } 619 #endif 620 621 in6_ifa_hold(ifa); 622 write_unlock(&idev->lock); 623 out2: 624 rcu_read_unlock_bh(); 625 626 if (likely(err == 0)) 627 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 628 else { 629 kfree(ifa); 630 ifa = ERR_PTR(err); 631 } 632 633 return ifa; 634 out: 635 write_unlock(&addrconf_hash_lock); 636 goto out2; 637 } 638 639 /* This function wants to get referenced ifp and releases it before return */ 640 641 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 642 { 643 struct inet6_ifaddr *ifa, **ifap; 644 struct inet6_dev *idev = ifp->idev; 645 int hash; 646 int deleted = 0, onlink = 0; 647 unsigned long expires = jiffies; 648 649 hash = ipv6_addr_hash(&ifp->addr); 650 651 ifp->dead = 1; 652 653 write_lock_bh(&addrconf_hash_lock); 654 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 655 ifap = &ifa->lst_next) { 656 if (ifa == ifp) { 657 *ifap = ifa->lst_next; 658 __in6_ifa_put(ifp); 659 ifa->lst_next = NULL; 660 break; 661 } 662 } 663 write_unlock_bh(&addrconf_hash_lock); 664 665 write_lock_bh(&idev->lock); 666 #ifdef CONFIG_IPV6_PRIVACY 667 if (ifp->flags&IFA_F_TEMPORARY) { 668 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 669 ifap = &ifa->tmp_next) { 670 if (ifa == ifp) { 671 *ifap = ifa->tmp_next; 672 if (ifp->ifpub) { 673 in6_ifa_put(ifp->ifpub); 674 ifp->ifpub = NULL; 675 } 676 __in6_ifa_put(ifp); 677 ifa->tmp_next = NULL; 678 break; 679 } 680 } 681 } 682 #endif 683 684 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 685 if (ifa == ifp) { 686 *ifap = ifa->if_next; 687 __in6_ifa_put(ifp); 688 ifa->if_next = NULL; 689 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 690 break; 691 deleted = 1; 692 continue; 693 } else if (ifp->flags & IFA_F_PERMANENT) { 694 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 695 ifp->prefix_len)) { 696 if (ifa->flags & IFA_F_PERMANENT) { 697 onlink = 1; 698 if (deleted) 699 break; 700 } else { 701 unsigned long lifetime; 702 703 if (!onlink) 704 onlink = -1; 705 706 spin_lock(&ifa->lock); 707 lifetime = min_t(unsigned long, 708 ifa->valid_lft, 0x7fffffffUL/HZ); 709 if (time_before(expires, 710 ifa->tstamp + lifetime * HZ)) 711 expires = ifa->tstamp + lifetime * HZ; 712 spin_unlock(&ifa->lock); 713 } 714 } 715 } 716 ifap = &ifa->if_next; 717 } 718 write_unlock_bh(&idev->lock); 719 720 ipv6_ifa_notify(RTM_DELADDR, ifp); 721 722 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 723 724 addrconf_del_timer(ifp); 725 726 /* 727 * Purge or update corresponding prefix 728 * 729 * 1) we don't purge prefix here if address was not permanent. 730 * prefix is managed by its own lifetime. 731 * 2) if there're no addresses, delete prefix. 732 * 3) if there're still other permanent address(es), 733 * corresponding prefix is still permanent. 734 * 4) otherwise, update prefix lifetime to the 735 * longest valid lifetime among the corresponding 736 * addresses on the device. 737 * Note: subsequent RA will update lifetime. 738 * 739 * --yoshfuji 740 */ 741 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 742 struct in6_addr prefix; 743 struct rt6_info *rt; 744 745 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 746 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 747 748 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 749 if (onlink == 0) { 750 ip6_del_rt(rt); 751 rt = NULL; 752 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 753 rt->rt6i_expires = expires; 754 rt->rt6i_flags |= RTF_EXPIRES; 755 } 756 } 757 dst_release(&rt->u.dst); 758 } 759 760 in6_ifa_put(ifp); 761 } 762 763 #ifdef CONFIG_IPV6_PRIVACY 764 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 765 { 766 struct inet6_dev *idev = ifp->idev; 767 struct in6_addr addr, *tmpaddr; 768 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 769 int tmp_plen; 770 int ret = 0; 771 int max_addresses; 772 773 write_lock(&idev->lock); 774 if (ift) { 775 spin_lock_bh(&ift->lock); 776 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 777 spin_unlock_bh(&ift->lock); 778 tmpaddr = &addr; 779 } else { 780 tmpaddr = NULL; 781 } 782 retry: 783 in6_dev_hold(idev); 784 if (idev->cnf.use_tempaddr <= 0) { 785 write_unlock(&idev->lock); 786 printk(KERN_INFO 787 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 788 in6_dev_put(idev); 789 ret = -1; 790 goto out; 791 } 792 spin_lock_bh(&ifp->lock); 793 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 794 idev->cnf.use_tempaddr = -1; /*XXX*/ 795 spin_unlock_bh(&ifp->lock); 796 write_unlock(&idev->lock); 797 printk(KERN_WARNING 798 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 799 in6_dev_put(idev); 800 ret = -1; 801 goto out; 802 } 803 in6_ifa_hold(ifp); 804 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 805 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 806 spin_unlock_bh(&ifp->lock); 807 write_unlock(&idev->lock); 808 printk(KERN_WARNING 809 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 810 in6_ifa_put(ifp); 811 in6_dev_put(idev); 812 ret = -1; 813 goto out; 814 } 815 memcpy(&addr.s6_addr[8], idev->rndid, 8); 816 tmp_valid_lft = min_t(__u32, 817 ifp->valid_lft, 818 idev->cnf.temp_valid_lft); 819 tmp_prefered_lft = min_t(__u32, 820 ifp->prefered_lft, 821 idev->cnf.temp_prefered_lft - desync_factor / HZ); 822 tmp_plen = ifp->prefix_len; 823 max_addresses = idev->cnf.max_addresses; 824 tmp_cstamp = ifp->cstamp; 825 tmp_tstamp = ifp->tstamp; 826 spin_unlock_bh(&ifp->lock); 827 828 write_unlock(&idev->lock); 829 ift = !max_addresses || 830 ipv6_count_addresses(idev) < max_addresses ? 831 ipv6_add_addr(idev, &addr, tmp_plen, 832 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL; 833 if (!ift || IS_ERR(ift)) { 834 in6_ifa_put(ifp); 835 in6_dev_put(idev); 836 printk(KERN_INFO 837 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 838 tmpaddr = &addr; 839 write_lock(&idev->lock); 840 goto retry; 841 } 842 843 spin_lock_bh(&ift->lock); 844 ift->ifpub = ifp; 845 ift->valid_lft = tmp_valid_lft; 846 ift->prefered_lft = tmp_prefered_lft; 847 ift->cstamp = tmp_cstamp; 848 ift->tstamp = tmp_tstamp; 849 spin_unlock_bh(&ift->lock); 850 851 addrconf_dad_start(ift, 0); 852 in6_ifa_put(ift); 853 in6_dev_put(idev); 854 out: 855 return ret; 856 } 857 #endif 858 859 /* 860 * Choose an appropriate source address (RFC3484) 861 */ 862 struct ipv6_saddr_score { 863 int addr_type; 864 unsigned int attrs; 865 int matchlen; 866 int scope; 867 unsigned int rule; 868 }; 869 870 #define IPV6_SADDR_SCORE_LOCAL 0x0001 871 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 872 #define IPV6_SADDR_SCORE_HOA 0x0008 873 #define IPV6_SADDR_SCORE_OIF 0x0010 874 #define IPV6_SADDR_SCORE_LABEL 0x0020 875 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 876 877 static int inline ipv6_saddr_preferred(int type) 878 { 879 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 880 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 881 return 1; 882 return 0; 883 } 884 885 /* static matching label */ 886 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type) 887 { 888 /* 889 * prefix (longest match) label 890 * ----------------------------- 891 * ::1/128 0 892 * ::/0 1 893 * 2002::/16 2 894 * ::/96 3 895 * ::ffff:0:0/96 4 896 * fc00::/7 5 897 * 2001::/32 6 898 */ 899 if (type & IPV6_ADDR_LOOPBACK) 900 return 0; 901 else if (type & IPV6_ADDR_COMPATv4) 902 return 3; 903 else if (type & IPV6_ADDR_MAPPED) 904 return 4; 905 else if (addr->s6_addr32[0] == htonl(0x20010000)) 906 return 6; 907 else if (addr->s6_addr16[0] == htons(0x2002)) 908 return 2; 909 else if ((addr->s6_addr[0] & 0xfe) == 0xfc) 910 return 5; 911 return 1; 912 } 913 914 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 915 struct in6_addr *daddr, struct in6_addr *saddr) 916 { 917 struct ipv6_saddr_score hiscore; 918 struct inet6_ifaddr *ifa_result = NULL; 919 int daddr_type = __ipv6_addr_type(daddr); 920 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 921 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type); 922 struct net_device *dev; 923 924 memset(&hiscore, 0, sizeof(hiscore)); 925 926 read_lock(&dev_base_lock); 927 rcu_read_lock(); 928 929 for (dev = dev_base; dev; dev=dev->next) { 930 struct inet6_dev *idev; 931 struct inet6_ifaddr *ifa; 932 933 /* Rule 0: Candidate Source Address (section 4) 934 * - multicast and link-local destination address, 935 * the set of candidate source address MUST only 936 * include addresses assigned to interfaces 937 * belonging to the same link as the outgoing 938 * interface. 939 * (- For site-local destination addresses, the 940 * set of candidate source addresses MUST only 941 * include addresses assigned to interfaces 942 * belonging to the same site as the outgoing 943 * interface.) 944 */ 945 if ((daddr_type & IPV6_ADDR_MULTICAST || 946 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 947 daddr_dev && dev != daddr_dev) 948 continue; 949 950 idev = __in6_dev_get(dev); 951 if (!idev) 952 continue; 953 954 read_lock_bh(&idev->lock); 955 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 956 struct ipv6_saddr_score score; 957 958 score.addr_type = __ipv6_addr_type(&ifa->addr); 959 960 /* Rule 0: 961 * - Tentative Address (RFC2462 section 5.4) 962 * - A tentative address is not considered 963 * "assigned to an interface" in the traditional 964 * sense. 965 * - Candidate Source Address (section 4) 966 * - In any case, anycast addresses, multicast 967 * addresses, and the unspecified address MUST 968 * NOT be included in a candidate set. 969 */ 970 if (ifa->flags & IFA_F_TENTATIVE) 971 continue; 972 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 973 score.addr_type & IPV6_ADDR_MULTICAST)) { 974 LIMIT_NETDEBUG(KERN_DEBUG 975 "ADDRCONF: unspecified / multicast address" 976 "assigned as unicast address on %s", 977 dev->name); 978 continue; 979 } 980 981 score.attrs = 0; 982 score.matchlen = 0; 983 score.scope = 0; 984 score.rule = 0; 985 986 if (ifa_result == NULL) { 987 /* record it if the first available entry */ 988 goto record_it; 989 } 990 991 /* Rule 1: Prefer same address */ 992 if (hiscore.rule < 1) { 993 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 994 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 995 hiscore.rule++; 996 } 997 if (ipv6_addr_equal(&ifa->addr, daddr)) { 998 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 999 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 1000 score.rule = 1; 1001 goto record_it; 1002 } 1003 } else { 1004 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 1005 continue; 1006 } 1007 1008 /* Rule 2: Prefer appropriate scope */ 1009 if (hiscore.rule < 2) { 1010 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 1011 hiscore.rule++; 1012 } 1013 score.scope = __ipv6_addr_src_scope(score.addr_type); 1014 if (hiscore.scope < score.scope) { 1015 if (hiscore.scope < daddr_scope) { 1016 score.rule = 2; 1017 goto record_it; 1018 } else 1019 continue; 1020 } else if (score.scope < hiscore.scope) { 1021 if (score.scope < daddr_scope) 1022 break; /* addresses sorted by scope */ 1023 else { 1024 score.rule = 2; 1025 goto record_it; 1026 } 1027 } 1028 1029 /* Rule 3: Avoid deprecated address */ 1030 if (hiscore.rule < 3) { 1031 if (ipv6_saddr_preferred(hiscore.addr_type) || 1032 !(ifa_result->flags & IFA_F_DEPRECATED)) 1033 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1034 hiscore.rule++; 1035 } 1036 if (ipv6_saddr_preferred(score.addr_type) || 1037 !(ifa->flags & IFA_F_DEPRECATED)) { 1038 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1039 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 1040 score.rule = 3; 1041 goto record_it; 1042 } 1043 } else { 1044 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 1045 continue; 1046 } 1047 1048 /* Rule 4: Prefer home address */ 1049 #ifdef CONFIG_IPV6_MIP6 1050 if (hiscore.rule < 4) { 1051 if (ifa_result->flags & IFA_F_HOMEADDRESS) 1052 hiscore.attrs |= IPV6_SADDR_SCORE_HOA; 1053 hiscore.rule++; 1054 } 1055 if (ifa->flags & IFA_F_HOMEADDRESS) { 1056 score.attrs |= IPV6_SADDR_SCORE_HOA; 1057 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) { 1058 score.rule = 4; 1059 goto record_it; 1060 } 1061 } else { 1062 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA) 1063 continue; 1064 } 1065 #else 1066 if (hiscore.rule < 4) 1067 hiscore.rule++; 1068 #endif 1069 1070 /* Rule 5: Prefer outgoing interface */ 1071 if (hiscore.rule < 5) { 1072 if (daddr_dev == NULL || 1073 daddr_dev == ifa_result->idev->dev) 1074 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1075 hiscore.rule++; 1076 } 1077 if (daddr_dev == NULL || 1078 daddr_dev == ifa->idev->dev) { 1079 score.attrs |= IPV6_SADDR_SCORE_OIF; 1080 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1081 score.rule = 5; 1082 goto record_it; 1083 } 1084 } else { 1085 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1086 continue; 1087 } 1088 1089 /* Rule 6: Prefer matching label */ 1090 if (hiscore.rule < 6) { 1091 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) 1092 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1093 hiscore.rule++; 1094 } 1095 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { 1096 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1097 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1098 score.rule = 6; 1099 goto record_it; 1100 } 1101 } else { 1102 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1103 continue; 1104 } 1105 1106 #ifdef CONFIG_IPV6_PRIVACY 1107 /* Rule 7: Prefer public address 1108 * Note: prefer temprary address if use_tempaddr >= 2 1109 */ 1110 if (hiscore.rule < 7) { 1111 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1112 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1113 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1114 hiscore.rule++; 1115 } 1116 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1117 (ifa->idev->cnf.use_tempaddr >= 2)) { 1118 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1119 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1120 score.rule = 7; 1121 goto record_it; 1122 } 1123 } else { 1124 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1125 continue; 1126 } 1127 #else 1128 if (hiscore.rule < 7) 1129 hiscore.rule++; 1130 #endif 1131 /* Rule 8: Use longest matching prefix */ 1132 if (hiscore.rule < 8) { 1133 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1134 hiscore.rule++; 1135 } 1136 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1137 if (score.matchlen > hiscore.matchlen) { 1138 score.rule = 8; 1139 goto record_it; 1140 } 1141 #if 0 1142 else if (score.matchlen < hiscore.matchlen) 1143 continue; 1144 #endif 1145 1146 /* Final Rule: choose first available one */ 1147 continue; 1148 record_it: 1149 if (ifa_result) 1150 in6_ifa_put(ifa_result); 1151 in6_ifa_hold(ifa); 1152 ifa_result = ifa; 1153 hiscore = score; 1154 } 1155 read_unlock_bh(&idev->lock); 1156 } 1157 rcu_read_unlock(); 1158 read_unlock(&dev_base_lock); 1159 1160 if (!ifa_result) 1161 return -EADDRNOTAVAIL; 1162 1163 ipv6_addr_copy(saddr, &ifa_result->addr); 1164 in6_ifa_put(ifa_result); 1165 return 0; 1166 } 1167 1168 1169 int ipv6_get_saddr(struct dst_entry *dst, 1170 struct in6_addr *daddr, struct in6_addr *saddr) 1171 { 1172 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr); 1173 } 1174 1175 1176 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr) 1177 { 1178 struct inet6_dev *idev; 1179 int err = -EADDRNOTAVAIL; 1180 1181 rcu_read_lock(); 1182 if ((idev = __in6_dev_get(dev)) != NULL) { 1183 struct inet6_ifaddr *ifp; 1184 1185 read_lock_bh(&idev->lock); 1186 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1187 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1188 ipv6_addr_copy(addr, &ifp->addr); 1189 err = 0; 1190 break; 1191 } 1192 } 1193 read_unlock_bh(&idev->lock); 1194 } 1195 rcu_read_unlock(); 1196 return err; 1197 } 1198 1199 static int ipv6_count_addresses(struct inet6_dev *idev) 1200 { 1201 int cnt = 0; 1202 struct inet6_ifaddr *ifp; 1203 1204 read_lock_bh(&idev->lock); 1205 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1206 cnt++; 1207 read_unlock_bh(&idev->lock); 1208 return cnt; 1209 } 1210 1211 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1212 { 1213 struct inet6_ifaddr * ifp; 1214 u8 hash = ipv6_addr_hash(addr); 1215 1216 read_lock_bh(&addrconf_hash_lock); 1217 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1218 if (ipv6_addr_equal(&ifp->addr, addr) && 1219 !(ifp->flags&IFA_F_TENTATIVE)) { 1220 if (dev == NULL || ifp->idev->dev == dev || 1221 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1222 break; 1223 } 1224 } 1225 read_unlock_bh(&addrconf_hash_lock); 1226 return ifp != NULL; 1227 } 1228 1229 static 1230 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1231 { 1232 struct inet6_ifaddr * ifp; 1233 u8 hash = ipv6_addr_hash(addr); 1234 1235 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1236 if (ipv6_addr_equal(&ifp->addr, addr)) { 1237 if (dev == NULL || ifp->idev->dev == dev) 1238 break; 1239 } 1240 } 1241 return ifp != NULL; 1242 } 1243 1244 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1245 { 1246 struct inet6_ifaddr * ifp; 1247 u8 hash = ipv6_addr_hash(addr); 1248 1249 read_lock_bh(&addrconf_hash_lock); 1250 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1251 if (ipv6_addr_equal(&ifp->addr, addr)) { 1252 if (dev == NULL || ifp->idev->dev == dev || 1253 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1254 in6_ifa_hold(ifp); 1255 break; 1256 } 1257 } 1258 } 1259 read_unlock_bh(&addrconf_hash_lock); 1260 1261 return ifp; 1262 } 1263 1264 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1265 { 1266 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1267 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1268 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1269 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1270 int sk_ipv6only = ipv6_only_sock(sk); 1271 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1272 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1273 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1274 1275 if (!sk2_rcv_saddr && !sk_ipv6only) 1276 return 1; 1277 1278 if (addr_type2 == IPV6_ADDR_ANY && 1279 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1280 return 1; 1281 1282 if (addr_type == IPV6_ADDR_ANY && 1283 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1284 return 1; 1285 1286 if (sk2_rcv_saddr6 && 1287 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1288 return 1; 1289 1290 if (addr_type == IPV6_ADDR_MAPPED && 1291 !sk2_ipv6only && 1292 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1293 return 1; 1294 1295 return 0; 1296 } 1297 1298 /* Gets referenced address, destroys ifaddr */ 1299 1300 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1301 { 1302 if (ifp->flags&IFA_F_PERMANENT) { 1303 spin_lock_bh(&ifp->lock); 1304 addrconf_del_timer(ifp); 1305 ifp->flags |= IFA_F_TENTATIVE; 1306 spin_unlock_bh(&ifp->lock); 1307 in6_ifa_put(ifp); 1308 #ifdef CONFIG_IPV6_PRIVACY 1309 } else if (ifp->flags&IFA_F_TEMPORARY) { 1310 struct inet6_ifaddr *ifpub; 1311 spin_lock_bh(&ifp->lock); 1312 ifpub = ifp->ifpub; 1313 if (ifpub) { 1314 in6_ifa_hold(ifpub); 1315 spin_unlock_bh(&ifp->lock); 1316 ipv6_create_tempaddr(ifpub, ifp); 1317 in6_ifa_put(ifpub); 1318 } else { 1319 spin_unlock_bh(&ifp->lock); 1320 } 1321 ipv6_del_addr(ifp); 1322 #endif 1323 } else 1324 ipv6_del_addr(ifp); 1325 } 1326 1327 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1328 { 1329 if (net_ratelimit()) 1330 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1331 addrconf_dad_stop(ifp); 1332 } 1333 1334 /* Join to solicited addr multicast group. */ 1335 1336 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1337 { 1338 struct in6_addr maddr; 1339 1340 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1341 return; 1342 1343 addrconf_addr_solict_mult(addr, &maddr); 1344 ipv6_dev_mc_inc(dev, &maddr); 1345 } 1346 1347 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1348 { 1349 struct in6_addr maddr; 1350 1351 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1352 return; 1353 1354 addrconf_addr_solict_mult(addr, &maddr); 1355 __ipv6_dev_mc_dec(idev, &maddr); 1356 } 1357 1358 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1359 { 1360 struct in6_addr addr; 1361 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1362 if (ipv6_addr_any(&addr)) 1363 return; 1364 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1365 } 1366 1367 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1368 { 1369 struct in6_addr addr; 1370 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1371 if (ipv6_addr_any(&addr)) 1372 return; 1373 __ipv6_dev_ac_dec(ifp->idev, &addr); 1374 } 1375 1376 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1377 { 1378 if (dev->addr_len != ETH_ALEN) 1379 return -1; 1380 memcpy(eui, dev->dev_addr, 3); 1381 memcpy(eui + 5, dev->dev_addr + 3, 3); 1382 1383 /* 1384 * The zSeries OSA network cards can be shared among various 1385 * OS instances, but the OSA cards have only one MAC address. 1386 * This leads to duplicate address conflicts in conjunction 1387 * with IPv6 if more than one instance uses the same card. 1388 * 1389 * The driver for these cards can deliver a unique 16-bit 1390 * identifier for each instance sharing the same card. It is 1391 * placed instead of 0xFFFE in the interface identifier. The 1392 * "u" bit of the interface identifier is not inverted in this 1393 * case. Hence the resulting interface identifier has local 1394 * scope according to RFC2373. 1395 */ 1396 if (dev->dev_id) { 1397 eui[3] = (dev->dev_id >> 8) & 0xFF; 1398 eui[4] = dev->dev_id & 0xFF; 1399 } else { 1400 eui[3] = 0xFF; 1401 eui[4] = 0xFE; 1402 eui[0] ^= 2; 1403 } 1404 return 0; 1405 } 1406 1407 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1408 { 1409 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1410 if (dev->addr_len != ARCNET_ALEN) 1411 return -1; 1412 memset(eui, 0, 7); 1413 eui[7] = *(u8*)dev->dev_addr; 1414 return 0; 1415 } 1416 1417 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1418 { 1419 if (dev->addr_len != INFINIBAND_ALEN) 1420 return -1; 1421 memcpy(eui, dev->dev_addr + 12, 8); 1422 eui[0] |= 2; 1423 return 0; 1424 } 1425 1426 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1427 { 1428 switch (dev->type) { 1429 case ARPHRD_ETHER: 1430 case ARPHRD_FDDI: 1431 case ARPHRD_IEEE802_TR: 1432 return addrconf_ifid_eui48(eui, dev); 1433 case ARPHRD_ARCNET: 1434 return addrconf_ifid_arcnet(eui, dev); 1435 case ARPHRD_INFINIBAND: 1436 return addrconf_ifid_infiniband(eui, dev); 1437 } 1438 return -1; 1439 } 1440 1441 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1442 { 1443 int err = -1; 1444 struct inet6_ifaddr *ifp; 1445 1446 read_lock_bh(&idev->lock); 1447 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1448 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1449 memcpy(eui, ifp->addr.s6_addr+8, 8); 1450 err = 0; 1451 break; 1452 } 1453 } 1454 read_unlock_bh(&idev->lock); 1455 return err; 1456 } 1457 1458 #ifdef CONFIG_IPV6_PRIVACY 1459 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1460 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1461 { 1462 regen: 1463 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1464 idev->rndid[0] &= ~0x02; 1465 1466 /* 1467 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1468 * check if generated address is not inappropriate 1469 * 1470 * - Reserved subnet anycast (RFC 2526) 1471 * 11111101 11....11 1xxxxxxx 1472 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 1473 * 00-00-5E-FE-xx-xx-xx-xx 1474 * - value 0 1475 * - XXX: already assigned to an address on the device 1476 */ 1477 if (idev->rndid[0] == 0xfd && 1478 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1479 (idev->rndid[7]&0x80)) 1480 goto regen; 1481 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1482 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1483 goto regen; 1484 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1485 goto regen; 1486 } 1487 1488 return 0; 1489 } 1490 1491 static void ipv6_regen_rndid(unsigned long data) 1492 { 1493 struct inet6_dev *idev = (struct inet6_dev *) data; 1494 unsigned long expires; 1495 1496 rcu_read_lock_bh(); 1497 write_lock_bh(&idev->lock); 1498 1499 if (idev->dead) 1500 goto out; 1501 1502 if (__ipv6_regen_rndid(idev) < 0) 1503 goto out; 1504 1505 expires = jiffies + 1506 idev->cnf.temp_prefered_lft * HZ - 1507 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1508 if (time_before(expires, jiffies)) { 1509 printk(KERN_WARNING 1510 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1511 idev->dev->name); 1512 goto out; 1513 } 1514 1515 if (!mod_timer(&idev->regen_timer, expires)) 1516 in6_dev_hold(idev); 1517 1518 out: 1519 write_unlock_bh(&idev->lock); 1520 rcu_read_unlock_bh(); 1521 in6_dev_put(idev); 1522 } 1523 1524 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1525 int ret = 0; 1526 1527 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1528 ret = __ipv6_regen_rndid(idev); 1529 return ret; 1530 } 1531 #endif 1532 1533 /* 1534 * Add prefix route. 1535 */ 1536 1537 static void 1538 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1539 unsigned long expires, u32 flags) 1540 { 1541 struct fib6_config cfg = { 1542 .fc_table = RT6_TABLE_PREFIX, 1543 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1544 .fc_ifindex = dev->ifindex, 1545 .fc_expires = expires, 1546 .fc_dst_len = plen, 1547 .fc_flags = RTF_UP | flags, 1548 }; 1549 1550 ipv6_addr_copy(&cfg.fc_dst, pfx); 1551 1552 /* Prevent useless cloning on PtP SIT. 1553 This thing is done here expecting that the whole 1554 class of non-broadcast devices need not cloning. 1555 */ 1556 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1557 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1558 cfg.fc_flags |= RTF_NONEXTHOP; 1559 #endif 1560 1561 ip6_route_add(&cfg); 1562 } 1563 1564 /* Create "default" multicast route to the interface */ 1565 1566 static void addrconf_add_mroute(struct net_device *dev) 1567 { 1568 struct fib6_config cfg = { 1569 .fc_table = RT6_TABLE_LOCAL, 1570 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1571 .fc_ifindex = dev->ifindex, 1572 .fc_dst_len = 8, 1573 .fc_flags = RTF_UP, 1574 }; 1575 1576 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1577 1578 ip6_route_add(&cfg); 1579 } 1580 1581 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1582 static void sit_route_add(struct net_device *dev) 1583 { 1584 struct fib6_config cfg = { 1585 .fc_table = RT6_TABLE_MAIN, 1586 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1587 .fc_ifindex = dev->ifindex, 1588 .fc_dst_len = 96, 1589 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1590 }; 1591 1592 /* prefix length - 96 bits "::d.d.d.d" */ 1593 ip6_route_add(&cfg); 1594 } 1595 #endif 1596 1597 static void addrconf_add_lroute(struct net_device *dev) 1598 { 1599 struct in6_addr addr; 1600 1601 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1602 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1603 } 1604 1605 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1606 { 1607 struct inet6_dev *idev; 1608 1609 ASSERT_RTNL(); 1610 1611 if ((idev = ipv6_find_idev(dev)) == NULL) 1612 return NULL; 1613 1614 /* Add default multicast route */ 1615 addrconf_add_mroute(dev); 1616 1617 /* Add link local route */ 1618 addrconf_add_lroute(dev); 1619 return idev; 1620 } 1621 1622 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1623 { 1624 struct prefix_info *pinfo; 1625 __u32 valid_lft; 1626 __u32 prefered_lft; 1627 int addr_type; 1628 unsigned long rt_expires; 1629 struct inet6_dev *in6_dev; 1630 1631 pinfo = (struct prefix_info *) opt; 1632 1633 if (len < sizeof(struct prefix_info)) { 1634 ADBG(("addrconf: prefix option too short\n")); 1635 return; 1636 } 1637 1638 /* 1639 * Validation checks ([ADDRCONF], page 19) 1640 */ 1641 1642 addr_type = ipv6_addr_type(&pinfo->prefix); 1643 1644 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1645 return; 1646 1647 valid_lft = ntohl(pinfo->valid); 1648 prefered_lft = ntohl(pinfo->prefered); 1649 1650 if (prefered_lft > valid_lft) { 1651 if (net_ratelimit()) 1652 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1653 return; 1654 } 1655 1656 in6_dev = in6_dev_get(dev); 1657 1658 if (in6_dev == NULL) { 1659 if (net_ratelimit()) 1660 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1661 return; 1662 } 1663 1664 /* 1665 * Two things going on here: 1666 * 1) Add routes for on-link prefixes 1667 * 2) Configure prefixes with the auto flag set 1668 */ 1669 1670 /* Avoid arithmetic overflow. Really, we could 1671 save rt_expires in seconds, likely valid_lft, 1672 but it would require division in fib gc, that it 1673 not good. 1674 */ 1675 if (valid_lft >= 0x7FFFFFFF/HZ) 1676 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1677 else 1678 rt_expires = valid_lft * HZ; 1679 1680 /* 1681 * We convert this (in jiffies) to clock_t later. 1682 * Avoid arithmetic overflow there as well. 1683 * Overflow can happen only if HZ < USER_HZ. 1684 */ 1685 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1686 rt_expires = 0x7FFFFFFF / USER_HZ; 1687 1688 if (pinfo->onlink) { 1689 struct rt6_info *rt; 1690 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1691 1692 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1693 if (rt->rt6i_flags&RTF_EXPIRES) { 1694 if (valid_lft == 0) { 1695 ip6_del_rt(rt); 1696 rt = NULL; 1697 } else { 1698 rt->rt6i_expires = jiffies + rt_expires; 1699 } 1700 } 1701 } else if (valid_lft) { 1702 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1703 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1704 } 1705 if (rt) 1706 dst_release(&rt->u.dst); 1707 } 1708 1709 /* Try to figure out our local address for this prefix */ 1710 1711 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1712 struct inet6_ifaddr * ifp; 1713 struct in6_addr addr; 1714 int create = 0, update_lft = 0; 1715 1716 if (pinfo->prefix_len == 64) { 1717 memcpy(&addr, &pinfo->prefix, 8); 1718 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1719 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1720 in6_dev_put(in6_dev); 1721 return; 1722 } 1723 goto ok; 1724 } 1725 if (net_ratelimit()) 1726 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1727 pinfo->prefix_len); 1728 in6_dev_put(in6_dev); 1729 return; 1730 1731 ok: 1732 1733 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1734 1735 if (ifp == NULL && valid_lft) { 1736 int max_addresses = in6_dev->cnf.max_addresses; 1737 1738 /* Do not allow to create too much of autoconfigured 1739 * addresses; this would be too easy way to crash kernel. 1740 */ 1741 if (!max_addresses || 1742 ipv6_count_addresses(in6_dev) < max_addresses) 1743 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1744 addr_type&IPV6_ADDR_SCOPE_MASK, 0); 1745 1746 if (!ifp || IS_ERR(ifp)) { 1747 in6_dev_put(in6_dev); 1748 return; 1749 } 1750 1751 update_lft = create = 1; 1752 ifp->cstamp = jiffies; 1753 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1754 } 1755 1756 if (ifp) { 1757 int flags; 1758 unsigned long now; 1759 #ifdef CONFIG_IPV6_PRIVACY 1760 struct inet6_ifaddr *ift; 1761 #endif 1762 u32 stored_lft; 1763 1764 /* update lifetime (RFC2462 5.5.3 e) */ 1765 spin_lock(&ifp->lock); 1766 now = jiffies; 1767 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1768 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1769 else 1770 stored_lft = 0; 1771 if (!update_lft && stored_lft) { 1772 if (valid_lft > MIN_VALID_LIFETIME || 1773 valid_lft > stored_lft) 1774 update_lft = 1; 1775 else if (stored_lft <= MIN_VALID_LIFETIME) { 1776 /* valid_lft <= stored_lft is always true */ 1777 /* XXX: IPsec */ 1778 update_lft = 0; 1779 } else { 1780 valid_lft = MIN_VALID_LIFETIME; 1781 if (valid_lft < prefered_lft) 1782 prefered_lft = valid_lft; 1783 update_lft = 1; 1784 } 1785 } 1786 1787 if (update_lft) { 1788 ifp->valid_lft = valid_lft; 1789 ifp->prefered_lft = prefered_lft; 1790 ifp->tstamp = now; 1791 flags = ifp->flags; 1792 ifp->flags &= ~IFA_F_DEPRECATED; 1793 spin_unlock(&ifp->lock); 1794 1795 if (!(flags&IFA_F_TENTATIVE)) 1796 ipv6_ifa_notify(0, ifp); 1797 } else 1798 spin_unlock(&ifp->lock); 1799 1800 #ifdef CONFIG_IPV6_PRIVACY 1801 read_lock_bh(&in6_dev->lock); 1802 /* update all temporary addresses in the list */ 1803 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1804 /* 1805 * When adjusting the lifetimes of an existing 1806 * temporary address, only lower the lifetimes. 1807 * Implementations must not increase the 1808 * lifetimes of an existing temporary address 1809 * when processing a Prefix Information Option. 1810 */ 1811 spin_lock(&ift->lock); 1812 flags = ift->flags; 1813 if (ift->valid_lft > valid_lft && 1814 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1815 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1816 if (ift->prefered_lft > prefered_lft && 1817 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1818 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1819 spin_unlock(&ift->lock); 1820 if (!(flags&IFA_F_TENTATIVE)) 1821 ipv6_ifa_notify(0, ift); 1822 } 1823 1824 if (create && in6_dev->cnf.use_tempaddr > 0) { 1825 /* 1826 * When a new public address is created as described in [ADDRCONF], 1827 * also create a new temporary address. 1828 */ 1829 read_unlock_bh(&in6_dev->lock); 1830 ipv6_create_tempaddr(ifp, NULL); 1831 } else { 1832 read_unlock_bh(&in6_dev->lock); 1833 } 1834 #endif 1835 in6_ifa_put(ifp); 1836 addrconf_verify(0); 1837 } 1838 } 1839 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1840 in6_dev_put(in6_dev); 1841 } 1842 1843 /* 1844 * Set destination address. 1845 * Special case for SIT interfaces where we create a new "virtual" 1846 * device. 1847 */ 1848 int addrconf_set_dstaddr(void __user *arg) 1849 { 1850 struct in6_ifreq ireq; 1851 struct net_device *dev; 1852 int err = -EINVAL; 1853 1854 rtnl_lock(); 1855 1856 err = -EFAULT; 1857 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1858 goto err_exit; 1859 1860 dev = __dev_get_by_index(ireq.ifr6_ifindex); 1861 1862 err = -ENODEV; 1863 if (dev == NULL) 1864 goto err_exit; 1865 1866 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1867 if (dev->type == ARPHRD_SIT) { 1868 struct ifreq ifr; 1869 mm_segment_t oldfs; 1870 struct ip_tunnel_parm p; 1871 1872 err = -EADDRNOTAVAIL; 1873 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1874 goto err_exit; 1875 1876 memset(&p, 0, sizeof(p)); 1877 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1878 p.iph.saddr = 0; 1879 p.iph.version = 4; 1880 p.iph.ihl = 5; 1881 p.iph.protocol = IPPROTO_IPV6; 1882 p.iph.ttl = 64; 1883 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1884 1885 oldfs = get_fs(); set_fs(KERNEL_DS); 1886 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1887 set_fs(oldfs); 1888 1889 if (err == 0) { 1890 err = -ENOBUFS; 1891 if ((dev = __dev_get_by_name(p.name)) == NULL) 1892 goto err_exit; 1893 err = dev_open(dev); 1894 } 1895 } 1896 #endif 1897 1898 err_exit: 1899 rtnl_unlock(); 1900 return err; 1901 } 1902 1903 /* 1904 * Manual configuration of address on an interface 1905 */ 1906 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1907 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft) 1908 { 1909 struct inet6_ifaddr *ifp; 1910 struct inet6_dev *idev; 1911 struct net_device *dev; 1912 int scope; 1913 1914 ASSERT_RTNL(); 1915 1916 /* check the lifetime */ 1917 if (!valid_lft || prefered_lft > valid_lft) 1918 return -EINVAL; 1919 1920 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1921 return -ENODEV; 1922 1923 if ((idev = addrconf_add_dev(dev)) == NULL) 1924 return -ENOBUFS; 1925 1926 scope = ipv6_addr_scope(pfx); 1927 1928 if (valid_lft == INFINITY_LIFE_TIME) 1929 ifa_flags |= IFA_F_PERMANENT; 1930 else if (valid_lft >= 0x7FFFFFFF/HZ) 1931 valid_lft = 0x7FFFFFFF/HZ; 1932 1933 if (prefered_lft == 0) 1934 ifa_flags |= IFA_F_DEPRECATED; 1935 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1936 (prefered_lft != INFINITY_LIFE_TIME)) 1937 prefered_lft = 0x7FFFFFFF/HZ; 1938 1939 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1940 1941 if (!IS_ERR(ifp)) { 1942 spin_lock_bh(&ifp->lock); 1943 ifp->valid_lft = valid_lft; 1944 ifp->prefered_lft = prefered_lft; 1945 ifp->tstamp = jiffies; 1946 spin_unlock_bh(&ifp->lock); 1947 1948 addrconf_dad_start(ifp, 0); 1949 in6_ifa_put(ifp); 1950 addrconf_verify(0); 1951 return 0; 1952 } 1953 1954 return PTR_ERR(ifp); 1955 } 1956 1957 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1958 { 1959 struct inet6_ifaddr *ifp; 1960 struct inet6_dev *idev; 1961 struct net_device *dev; 1962 1963 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1964 return -ENODEV; 1965 1966 if ((idev = __in6_dev_get(dev)) == NULL) 1967 return -ENXIO; 1968 1969 read_lock_bh(&idev->lock); 1970 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1971 if (ifp->prefix_len == plen && 1972 ipv6_addr_equal(pfx, &ifp->addr)) { 1973 in6_ifa_hold(ifp); 1974 read_unlock_bh(&idev->lock); 1975 1976 ipv6_del_addr(ifp); 1977 1978 /* If the last address is deleted administratively, 1979 disable IPv6 on this interface. 1980 */ 1981 if (idev->addr_list == NULL) 1982 addrconf_ifdown(idev->dev, 1); 1983 return 0; 1984 } 1985 } 1986 read_unlock_bh(&idev->lock); 1987 return -EADDRNOTAVAIL; 1988 } 1989 1990 1991 int addrconf_add_ifaddr(void __user *arg) 1992 { 1993 struct in6_ifreq ireq; 1994 int err; 1995 1996 if (!capable(CAP_NET_ADMIN)) 1997 return -EPERM; 1998 1999 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2000 return -EFAULT; 2001 2002 rtnl_lock(); 2003 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 2004 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2005 rtnl_unlock(); 2006 return err; 2007 } 2008 2009 int addrconf_del_ifaddr(void __user *arg) 2010 { 2011 struct in6_ifreq ireq; 2012 int err; 2013 2014 if (!capable(CAP_NET_ADMIN)) 2015 return -EPERM; 2016 2017 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2018 return -EFAULT; 2019 2020 rtnl_lock(); 2021 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 2022 rtnl_unlock(); 2023 return err; 2024 } 2025 2026 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2027 static void sit_add_v4_addrs(struct inet6_dev *idev) 2028 { 2029 struct inet6_ifaddr * ifp; 2030 struct in6_addr addr; 2031 struct net_device *dev; 2032 int scope; 2033 2034 ASSERT_RTNL(); 2035 2036 memset(&addr, 0, sizeof(struct in6_addr)); 2037 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2038 2039 if (idev->dev->flags&IFF_POINTOPOINT) { 2040 addr.s6_addr32[0] = htonl(0xfe800000); 2041 scope = IFA_LINK; 2042 } else { 2043 scope = IPV6_ADDR_COMPATv4; 2044 } 2045 2046 if (addr.s6_addr32[3]) { 2047 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2048 if (!IS_ERR(ifp)) { 2049 spin_lock_bh(&ifp->lock); 2050 ifp->flags &= ~IFA_F_TENTATIVE; 2051 spin_unlock_bh(&ifp->lock); 2052 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2053 in6_ifa_put(ifp); 2054 } 2055 return; 2056 } 2057 2058 for (dev = dev_base; dev != NULL; dev = dev->next) { 2059 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2060 if (in_dev && (dev->flags & IFF_UP)) { 2061 struct in_ifaddr * ifa; 2062 2063 int flag = scope; 2064 2065 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2066 int plen; 2067 2068 addr.s6_addr32[3] = ifa->ifa_local; 2069 2070 if (ifa->ifa_scope == RT_SCOPE_LINK) 2071 continue; 2072 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2073 if (idev->dev->flags&IFF_POINTOPOINT) 2074 continue; 2075 flag |= IFA_HOST; 2076 } 2077 if (idev->dev->flags&IFF_POINTOPOINT) 2078 plen = 64; 2079 else 2080 plen = 96; 2081 2082 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2083 IFA_F_PERMANENT); 2084 if (!IS_ERR(ifp)) { 2085 spin_lock_bh(&ifp->lock); 2086 ifp->flags &= ~IFA_F_TENTATIVE; 2087 spin_unlock_bh(&ifp->lock); 2088 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2089 in6_ifa_put(ifp); 2090 } 2091 } 2092 } 2093 } 2094 } 2095 #endif 2096 2097 static void init_loopback(struct net_device *dev) 2098 { 2099 struct inet6_dev *idev; 2100 struct inet6_ifaddr * ifp; 2101 2102 /* ::1 */ 2103 2104 ASSERT_RTNL(); 2105 2106 if ((idev = ipv6_find_idev(dev)) == NULL) { 2107 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2108 return; 2109 } 2110 2111 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2112 if (!IS_ERR(ifp)) { 2113 spin_lock_bh(&ifp->lock); 2114 ifp->flags &= ~IFA_F_TENTATIVE; 2115 spin_unlock_bh(&ifp->lock); 2116 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2117 in6_ifa_put(ifp); 2118 } 2119 } 2120 2121 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2122 { 2123 struct inet6_ifaddr * ifp; 2124 2125 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT); 2126 if (!IS_ERR(ifp)) { 2127 addrconf_dad_start(ifp, 0); 2128 in6_ifa_put(ifp); 2129 } 2130 } 2131 2132 static void addrconf_dev_config(struct net_device *dev) 2133 { 2134 struct in6_addr addr; 2135 struct inet6_dev * idev; 2136 2137 ASSERT_RTNL(); 2138 2139 if ((dev->type != ARPHRD_ETHER) && 2140 (dev->type != ARPHRD_FDDI) && 2141 (dev->type != ARPHRD_IEEE802_TR) && 2142 (dev->type != ARPHRD_ARCNET) && 2143 (dev->type != ARPHRD_INFINIBAND)) { 2144 /* Alas, we support only Ethernet autoconfiguration. */ 2145 return; 2146 } 2147 2148 idev = addrconf_add_dev(dev); 2149 if (idev == NULL) 2150 return; 2151 2152 memset(&addr, 0, sizeof(struct in6_addr)); 2153 addr.s6_addr32[0] = htonl(0xFE800000); 2154 2155 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2156 addrconf_add_linklocal(idev, &addr); 2157 } 2158 2159 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2160 static void addrconf_sit_config(struct net_device *dev) 2161 { 2162 struct inet6_dev *idev; 2163 2164 ASSERT_RTNL(); 2165 2166 /* 2167 * Configure the tunnel with one of our IPv4 2168 * addresses... we should configure all of 2169 * our v4 addrs in the tunnel 2170 */ 2171 2172 if ((idev = ipv6_find_idev(dev)) == NULL) { 2173 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2174 return; 2175 } 2176 2177 sit_add_v4_addrs(idev); 2178 2179 if (dev->flags&IFF_POINTOPOINT) { 2180 addrconf_add_mroute(dev); 2181 addrconf_add_lroute(dev); 2182 } else 2183 sit_route_add(dev); 2184 } 2185 #endif 2186 2187 static inline int 2188 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2189 { 2190 struct in6_addr lladdr; 2191 2192 if (!ipv6_get_lladdr(link_dev, &lladdr)) { 2193 addrconf_add_linklocal(idev, &lladdr); 2194 return 0; 2195 } 2196 return -1; 2197 } 2198 2199 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2200 { 2201 struct net_device *link_dev; 2202 2203 /* first try to inherit the link-local address from the link device */ 2204 if (idev->dev->iflink && 2205 (link_dev = __dev_get_by_index(idev->dev->iflink))) { 2206 if (!ipv6_inherit_linklocal(idev, link_dev)) 2207 return; 2208 } 2209 /* then try to inherit it from any device */ 2210 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) { 2211 if (!ipv6_inherit_linklocal(idev, link_dev)) 2212 return; 2213 } 2214 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2215 } 2216 2217 /* 2218 * Autoconfigure tunnel with a link-local address so routing protocols, 2219 * DHCPv6, MLD etc. can be run over the virtual link 2220 */ 2221 2222 static void addrconf_ip6_tnl_config(struct net_device *dev) 2223 { 2224 struct inet6_dev *idev; 2225 2226 ASSERT_RTNL(); 2227 2228 if ((idev = addrconf_add_dev(dev)) == NULL) { 2229 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2230 return; 2231 } 2232 ip6_tnl_add_linklocal(idev); 2233 } 2234 2235 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2236 void * data) 2237 { 2238 struct net_device *dev = (struct net_device *) data; 2239 struct inet6_dev *idev = __in6_dev_get(dev); 2240 int run_pending = 0; 2241 2242 switch(event) { 2243 case NETDEV_UP: 2244 case NETDEV_CHANGE: 2245 if (event == NETDEV_UP) { 2246 if (!netif_carrier_ok(dev)) { 2247 /* device is not ready yet. */ 2248 printk(KERN_INFO 2249 "ADDRCONF(NETDEV_UP): %s: " 2250 "link is not ready\n", 2251 dev->name); 2252 break; 2253 } 2254 2255 if (idev) 2256 idev->if_flags |= IF_READY; 2257 } else { 2258 if (!netif_carrier_ok(dev)) { 2259 /* device is still not ready. */ 2260 break; 2261 } 2262 2263 if (idev) { 2264 if (idev->if_flags & IF_READY) { 2265 /* device is already configured. */ 2266 break; 2267 } 2268 idev->if_flags |= IF_READY; 2269 } 2270 2271 printk(KERN_INFO 2272 "ADDRCONF(NETDEV_CHANGE): %s: " 2273 "link becomes ready\n", 2274 dev->name); 2275 2276 run_pending = 1; 2277 } 2278 2279 switch(dev->type) { 2280 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2281 case ARPHRD_SIT: 2282 addrconf_sit_config(dev); 2283 break; 2284 #endif 2285 case ARPHRD_TUNNEL6: 2286 addrconf_ip6_tnl_config(dev); 2287 break; 2288 case ARPHRD_LOOPBACK: 2289 init_loopback(dev); 2290 break; 2291 2292 default: 2293 addrconf_dev_config(dev); 2294 break; 2295 }; 2296 if (idev) { 2297 if (run_pending) 2298 addrconf_dad_run(idev); 2299 2300 /* If the MTU changed during the interface down, when the 2301 interface up, the changed MTU must be reflected in the 2302 idev as well as routers. 2303 */ 2304 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2305 rt6_mtu_change(dev, dev->mtu); 2306 idev->cnf.mtu6 = dev->mtu; 2307 } 2308 idev->tstamp = jiffies; 2309 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2310 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2311 stop IPv6 on this interface. 2312 */ 2313 if (dev->mtu < IPV6_MIN_MTU) 2314 addrconf_ifdown(dev, event != NETDEV_DOWN); 2315 } 2316 break; 2317 2318 case NETDEV_CHANGEMTU: 2319 if ( idev && dev->mtu >= IPV6_MIN_MTU) { 2320 rt6_mtu_change(dev, dev->mtu); 2321 idev->cnf.mtu6 = dev->mtu; 2322 break; 2323 } 2324 2325 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2326 2327 case NETDEV_DOWN: 2328 case NETDEV_UNREGISTER: 2329 /* 2330 * Remove all addresses from this interface. 2331 */ 2332 addrconf_ifdown(dev, event != NETDEV_DOWN); 2333 break; 2334 2335 case NETDEV_CHANGENAME: 2336 #ifdef CONFIG_SYSCTL 2337 if (idev) { 2338 addrconf_sysctl_unregister(&idev->cnf); 2339 neigh_sysctl_unregister(idev->nd_parms); 2340 neigh_sysctl_register(dev, idev->nd_parms, 2341 NET_IPV6, NET_IPV6_NEIGH, "ipv6", 2342 &ndisc_ifinfo_sysctl_change, 2343 NULL); 2344 addrconf_sysctl_register(idev, &idev->cnf); 2345 } 2346 #endif 2347 break; 2348 }; 2349 2350 return NOTIFY_OK; 2351 } 2352 2353 /* 2354 * addrconf module should be notified of a device going up 2355 */ 2356 static struct notifier_block ipv6_dev_notf = { 2357 .notifier_call = addrconf_notify, 2358 .priority = 0 2359 }; 2360 2361 static int addrconf_ifdown(struct net_device *dev, int how) 2362 { 2363 struct inet6_dev *idev; 2364 struct inet6_ifaddr *ifa, **bifa; 2365 int i; 2366 2367 ASSERT_RTNL(); 2368 2369 if (dev == &loopback_dev && how == 1) 2370 how = 0; 2371 2372 rt6_ifdown(dev); 2373 neigh_ifdown(&nd_tbl, dev); 2374 2375 idev = __in6_dev_get(dev); 2376 if (idev == NULL) 2377 return -ENODEV; 2378 2379 /* Step 1: remove reference to ipv6 device from parent device. 2380 Do not dev_put! 2381 */ 2382 if (how == 1) { 2383 idev->dead = 1; 2384 2385 /* protected by rtnl_lock */ 2386 rcu_assign_pointer(dev->ip6_ptr, NULL); 2387 2388 /* Step 1.5: remove snmp6 entry */ 2389 snmp6_unregister_dev(idev); 2390 2391 } 2392 2393 /* Step 2: clear hash table */ 2394 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2395 bifa = &inet6_addr_lst[i]; 2396 2397 write_lock_bh(&addrconf_hash_lock); 2398 while ((ifa = *bifa) != NULL) { 2399 if (ifa->idev == idev) { 2400 *bifa = ifa->lst_next; 2401 ifa->lst_next = NULL; 2402 addrconf_del_timer(ifa); 2403 in6_ifa_put(ifa); 2404 continue; 2405 } 2406 bifa = &ifa->lst_next; 2407 } 2408 write_unlock_bh(&addrconf_hash_lock); 2409 } 2410 2411 write_lock_bh(&idev->lock); 2412 2413 /* Step 3: clear flags for stateless addrconf */ 2414 if (how != 1) 2415 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2416 2417 /* Step 4: clear address list */ 2418 #ifdef CONFIG_IPV6_PRIVACY 2419 if (how == 1 && del_timer(&idev->regen_timer)) 2420 in6_dev_put(idev); 2421 2422 /* clear tempaddr list */ 2423 while ((ifa = idev->tempaddr_list) != NULL) { 2424 idev->tempaddr_list = ifa->tmp_next; 2425 ifa->tmp_next = NULL; 2426 ifa->dead = 1; 2427 write_unlock_bh(&idev->lock); 2428 spin_lock_bh(&ifa->lock); 2429 2430 if (ifa->ifpub) { 2431 in6_ifa_put(ifa->ifpub); 2432 ifa->ifpub = NULL; 2433 } 2434 spin_unlock_bh(&ifa->lock); 2435 in6_ifa_put(ifa); 2436 write_lock_bh(&idev->lock); 2437 } 2438 #endif 2439 while ((ifa = idev->addr_list) != NULL) { 2440 idev->addr_list = ifa->if_next; 2441 ifa->if_next = NULL; 2442 ifa->dead = 1; 2443 addrconf_del_timer(ifa); 2444 write_unlock_bh(&idev->lock); 2445 2446 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2447 in6_ifa_put(ifa); 2448 2449 write_lock_bh(&idev->lock); 2450 } 2451 write_unlock_bh(&idev->lock); 2452 2453 /* Step 5: Discard multicast list */ 2454 2455 if (how == 1) 2456 ipv6_mc_destroy_dev(idev); 2457 else 2458 ipv6_mc_down(idev); 2459 2460 /* Step 5: netlink notification of this interface */ 2461 idev->tstamp = jiffies; 2462 inet6_ifinfo_notify(RTM_DELLINK, idev); 2463 2464 /* Shot the device (if unregistered) */ 2465 2466 if (how == 1) { 2467 #ifdef CONFIG_SYSCTL 2468 addrconf_sysctl_unregister(&idev->cnf); 2469 neigh_sysctl_unregister(idev->nd_parms); 2470 #endif 2471 neigh_parms_release(&nd_tbl, idev->nd_parms); 2472 neigh_ifdown(&nd_tbl, dev); 2473 in6_dev_put(idev); 2474 } 2475 return 0; 2476 } 2477 2478 static void addrconf_rs_timer(unsigned long data) 2479 { 2480 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2481 2482 if (ifp->idev->cnf.forwarding) 2483 goto out; 2484 2485 if (ifp->idev->if_flags & IF_RA_RCVD) { 2486 /* 2487 * Announcement received after solicitation 2488 * was sent 2489 */ 2490 goto out; 2491 } 2492 2493 spin_lock(&ifp->lock); 2494 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2495 struct in6_addr all_routers; 2496 2497 /* The wait after the last probe can be shorter */ 2498 addrconf_mod_timer(ifp, AC_RS, 2499 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2500 ifp->idev->cnf.rtr_solicit_delay : 2501 ifp->idev->cnf.rtr_solicit_interval); 2502 spin_unlock(&ifp->lock); 2503 2504 ipv6_addr_all_routers(&all_routers); 2505 2506 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2507 } else { 2508 spin_unlock(&ifp->lock); 2509 /* 2510 * Note: we do not support deprecated "all on-link" 2511 * assumption any longer. 2512 */ 2513 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2514 ifp->idev->dev->name); 2515 } 2516 2517 out: 2518 in6_ifa_put(ifp); 2519 } 2520 2521 /* 2522 * Duplicate Address Detection 2523 */ 2524 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2525 { 2526 unsigned long rand_num; 2527 struct inet6_dev *idev = ifp->idev; 2528 2529 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2530 ifp->probes = idev->cnf.dad_transmits; 2531 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2532 } 2533 2534 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2535 { 2536 struct inet6_dev *idev = ifp->idev; 2537 struct net_device *dev = idev->dev; 2538 2539 addrconf_join_solict(dev, &ifp->addr); 2540 2541 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT)) 2542 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0, 2543 flags); 2544 2545 net_srandom(ifp->addr.s6_addr32[3]); 2546 2547 read_lock_bh(&idev->lock); 2548 if (ifp->dead) 2549 goto out; 2550 spin_lock_bh(&ifp->lock); 2551 2552 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2553 !(ifp->flags&IFA_F_TENTATIVE) || 2554 ifp->flags & IFA_F_NODAD) { 2555 ifp->flags &= ~IFA_F_TENTATIVE; 2556 spin_unlock_bh(&ifp->lock); 2557 read_unlock_bh(&idev->lock); 2558 2559 addrconf_dad_completed(ifp); 2560 return; 2561 } 2562 2563 if (!(idev->if_flags & IF_READY)) { 2564 spin_unlock_bh(&ifp->lock); 2565 read_unlock_bh(&idev->lock); 2566 /* 2567 * If the defice is not ready: 2568 * - keep it tentative if it is a permanent address. 2569 * - otherwise, kill it. 2570 */ 2571 in6_ifa_hold(ifp); 2572 addrconf_dad_stop(ifp); 2573 return; 2574 } 2575 addrconf_dad_kick(ifp); 2576 spin_unlock_bh(&ifp->lock); 2577 out: 2578 read_unlock_bh(&idev->lock); 2579 } 2580 2581 static void addrconf_dad_timer(unsigned long data) 2582 { 2583 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2584 struct inet6_dev *idev = ifp->idev; 2585 struct in6_addr unspec; 2586 struct in6_addr mcaddr; 2587 2588 read_lock_bh(&idev->lock); 2589 if (idev->dead) { 2590 read_unlock_bh(&idev->lock); 2591 goto out; 2592 } 2593 spin_lock_bh(&ifp->lock); 2594 if (ifp->probes == 0) { 2595 /* 2596 * DAD was successful 2597 */ 2598 2599 ifp->flags &= ~IFA_F_TENTATIVE; 2600 spin_unlock_bh(&ifp->lock); 2601 read_unlock_bh(&idev->lock); 2602 2603 addrconf_dad_completed(ifp); 2604 2605 goto out; 2606 } 2607 2608 ifp->probes--; 2609 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2610 spin_unlock_bh(&ifp->lock); 2611 read_unlock_bh(&idev->lock); 2612 2613 /* send a neighbour solicitation for our addr */ 2614 memset(&unspec, 0, sizeof(unspec)); 2615 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2616 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2617 out: 2618 in6_ifa_put(ifp); 2619 } 2620 2621 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2622 { 2623 struct net_device * dev = ifp->idev->dev; 2624 2625 /* 2626 * Configure the address for reception. Now it is valid. 2627 */ 2628 2629 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2630 2631 /* If added prefix is link local and forwarding is off, 2632 start sending router solicitations. 2633 */ 2634 2635 if (ifp->idev->cnf.forwarding == 0 && 2636 ifp->idev->cnf.rtr_solicits > 0 && 2637 (dev->flags&IFF_LOOPBACK) == 0 && 2638 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2639 struct in6_addr all_routers; 2640 2641 ipv6_addr_all_routers(&all_routers); 2642 2643 /* 2644 * If a host as already performed a random delay 2645 * [...] as part of DAD [...] there is no need 2646 * to delay again before sending the first RS 2647 */ 2648 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2649 2650 spin_lock_bh(&ifp->lock); 2651 ifp->probes = 1; 2652 ifp->idev->if_flags |= IF_RS_SENT; 2653 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2654 spin_unlock_bh(&ifp->lock); 2655 } 2656 } 2657 2658 static void addrconf_dad_run(struct inet6_dev *idev) { 2659 struct inet6_ifaddr *ifp; 2660 2661 read_lock_bh(&idev->lock); 2662 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2663 spin_lock_bh(&ifp->lock); 2664 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2665 spin_unlock_bh(&ifp->lock); 2666 continue; 2667 } 2668 spin_unlock_bh(&ifp->lock); 2669 addrconf_dad_kick(ifp); 2670 } 2671 read_unlock_bh(&idev->lock); 2672 } 2673 2674 #ifdef CONFIG_PROC_FS 2675 struct if6_iter_state { 2676 int bucket; 2677 }; 2678 2679 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2680 { 2681 struct inet6_ifaddr *ifa = NULL; 2682 struct if6_iter_state *state = seq->private; 2683 2684 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2685 ifa = inet6_addr_lst[state->bucket]; 2686 if (ifa) 2687 break; 2688 } 2689 return ifa; 2690 } 2691 2692 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2693 { 2694 struct if6_iter_state *state = seq->private; 2695 2696 ifa = ifa->lst_next; 2697 try_again: 2698 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2699 ifa = inet6_addr_lst[state->bucket]; 2700 goto try_again; 2701 } 2702 return ifa; 2703 } 2704 2705 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2706 { 2707 struct inet6_ifaddr *ifa = if6_get_first(seq); 2708 2709 if (ifa) 2710 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2711 --pos; 2712 return pos ? NULL : ifa; 2713 } 2714 2715 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2716 { 2717 read_lock_bh(&addrconf_hash_lock); 2718 return if6_get_idx(seq, *pos); 2719 } 2720 2721 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2722 { 2723 struct inet6_ifaddr *ifa; 2724 2725 ifa = if6_get_next(seq, v); 2726 ++*pos; 2727 return ifa; 2728 } 2729 2730 static void if6_seq_stop(struct seq_file *seq, void *v) 2731 { 2732 read_unlock_bh(&addrconf_hash_lock); 2733 } 2734 2735 static int if6_seq_show(struct seq_file *seq, void *v) 2736 { 2737 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2738 seq_printf(seq, 2739 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2740 NIP6(ifp->addr), 2741 ifp->idev->dev->ifindex, 2742 ifp->prefix_len, 2743 ifp->scope, 2744 ifp->flags, 2745 ifp->idev->dev->name); 2746 return 0; 2747 } 2748 2749 static struct seq_operations if6_seq_ops = { 2750 .start = if6_seq_start, 2751 .next = if6_seq_next, 2752 .show = if6_seq_show, 2753 .stop = if6_seq_stop, 2754 }; 2755 2756 static int if6_seq_open(struct inode *inode, struct file *file) 2757 { 2758 struct seq_file *seq; 2759 int rc = -ENOMEM; 2760 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2761 2762 if (!s) 2763 goto out; 2764 2765 rc = seq_open(file, &if6_seq_ops); 2766 if (rc) 2767 goto out_kfree; 2768 2769 seq = file->private_data; 2770 seq->private = s; 2771 out: 2772 return rc; 2773 out_kfree: 2774 kfree(s); 2775 goto out; 2776 } 2777 2778 static const struct file_operations if6_fops = { 2779 .owner = THIS_MODULE, 2780 .open = if6_seq_open, 2781 .read = seq_read, 2782 .llseek = seq_lseek, 2783 .release = seq_release_private, 2784 }; 2785 2786 int __init if6_proc_init(void) 2787 { 2788 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops)) 2789 return -ENOMEM; 2790 return 0; 2791 } 2792 2793 void if6_proc_exit(void) 2794 { 2795 proc_net_remove("if_inet6"); 2796 } 2797 #endif /* CONFIG_PROC_FS */ 2798 2799 #ifdef CONFIG_IPV6_MIP6 2800 /* Check if address is a home address configured on any interface. */ 2801 int ipv6_chk_home_addr(struct in6_addr *addr) 2802 { 2803 int ret = 0; 2804 struct inet6_ifaddr * ifp; 2805 u8 hash = ipv6_addr_hash(addr); 2806 read_lock_bh(&addrconf_hash_lock); 2807 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) { 2808 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 && 2809 (ifp->flags & IFA_F_HOMEADDRESS)) { 2810 ret = 1; 2811 break; 2812 } 2813 } 2814 read_unlock_bh(&addrconf_hash_lock); 2815 return ret; 2816 } 2817 #endif 2818 2819 /* 2820 * Periodic address status verification 2821 */ 2822 2823 static void addrconf_verify(unsigned long foo) 2824 { 2825 struct inet6_ifaddr *ifp; 2826 unsigned long now, next; 2827 int i; 2828 2829 spin_lock_bh(&addrconf_verify_lock); 2830 now = jiffies; 2831 next = now + ADDR_CHECK_FREQUENCY; 2832 2833 del_timer(&addr_chk_timer); 2834 2835 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2836 2837 restart: 2838 read_lock(&addrconf_hash_lock); 2839 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2840 unsigned long age; 2841 #ifdef CONFIG_IPV6_PRIVACY 2842 unsigned long regen_advance; 2843 #endif 2844 2845 if (ifp->flags & IFA_F_PERMANENT) 2846 continue; 2847 2848 spin_lock(&ifp->lock); 2849 age = (now - ifp->tstamp) / HZ; 2850 2851 #ifdef CONFIG_IPV6_PRIVACY 2852 regen_advance = ifp->idev->cnf.regen_max_retry * 2853 ifp->idev->cnf.dad_transmits * 2854 ifp->idev->nd_parms->retrans_time / HZ; 2855 #endif 2856 2857 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2858 age >= ifp->valid_lft) { 2859 spin_unlock(&ifp->lock); 2860 in6_ifa_hold(ifp); 2861 read_unlock(&addrconf_hash_lock); 2862 ipv6_del_addr(ifp); 2863 goto restart; 2864 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2865 spin_unlock(&ifp->lock); 2866 continue; 2867 } else if (age >= ifp->prefered_lft) { 2868 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2869 int deprecate = 0; 2870 2871 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2872 deprecate = 1; 2873 ifp->flags |= IFA_F_DEPRECATED; 2874 } 2875 2876 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2877 next = ifp->tstamp + ifp->valid_lft * HZ; 2878 2879 spin_unlock(&ifp->lock); 2880 2881 if (deprecate) { 2882 in6_ifa_hold(ifp); 2883 read_unlock(&addrconf_hash_lock); 2884 2885 ipv6_ifa_notify(0, ifp); 2886 in6_ifa_put(ifp); 2887 goto restart; 2888 } 2889 #ifdef CONFIG_IPV6_PRIVACY 2890 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2891 !(ifp->flags&IFA_F_TENTATIVE)) { 2892 if (age >= ifp->prefered_lft - regen_advance) { 2893 struct inet6_ifaddr *ifpub = ifp->ifpub; 2894 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2895 next = ifp->tstamp + ifp->prefered_lft * HZ; 2896 if (!ifp->regen_count && ifpub) { 2897 ifp->regen_count++; 2898 in6_ifa_hold(ifp); 2899 in6_ifa_hold(ifpub); 2900 spin_unlock(&ifp->lock); 2901 read_unlock(&addrconf_hash_lock); 2902 spin_lock(&ifpub->lock); 2903 ifpub->regen_count = 0; 2904 spin_unlock(&ifpub->lock); 2905 ipv6_create_tempaddr(ifpub, ifp); 2906 in6_ifa_put(ifpub); 2907 in6_ifa_put(ifp); 2908 goto restart; 2909 } 2910 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2911 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2912 spin_unlock(&ifp->lock); 2913 #endif 2914 } else { 2915 /* ifp->prefered_lft <= ifp->valid_lft */ 2916 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2917 next = ifp->tstamp + ifp->prefered_lft * HZ; 2918 spin_unlock(&ifp->lock); 2919 } 2920 } 2921 read_unlock(&addrconf_hash_lock); 2922 } 2923 2924 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2925 add_timer(&addr_chk_timer); 2926 spin_unlock_bh(&addrconf_verify_lock); 2927 } 2928 2929 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 2930 { 2931 struct in6_addr *pfx = NULL; 2932 2933 if (addr) 2934 pfx = nla_data(addr); 2935 2936 if (local) { 2937 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 2938 pfx = NULL; 2939 else 2940 pfx = nla_data(local); 2941 } 2942 2943 return pfx; 2944 } 2945 2946 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = { 2947 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 2948 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 2949 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 2950 }; 2951 2952 static int 2953 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2954 { 2955 struct ifaddrmsg *ifm; 2956 struct nlattr *tb[IFA_MAX+1]; 2957 struct in6_addr *pfx; 2958 int err; 2959 2960 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 2961 if (err < 0) 2962 return err; 2963 2964 ifm = nlmsg_data(nlh); 2965 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 2966 if (pfx == NULL) 2967 return -EINVAL; 2968 2969 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 2970 } 2971 2972 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 2973 u32 prefered_lft, u32 valid_lft) 2974 { 2975 if (!valid_lft || (prefered_lft > valid_lft)) 2976 return -EINVAL; 2977 2978 if (valid_lft == INFINITY_LIFE_TIME) 2979 ifa_flags |= IFA_F_PERMANENT; 2980 else if (valid_lft >= 0x7FFFFFFF/HZ) 2981 valid_lft = 0x7FFFFFFF/HZ; 2982 2983 if (prefered_lft == 0) 2984 ifa_flags |= IFA_F_DEPRECATED; 2985 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 2986 (prefered_lft != INFINITY_LIFE_TIME)) 2987 prefered_lft = 0x7FFFFFFF/HZ; 2988 2989 spin_lock_bh(&ifp->lock); 2990 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 2991 ifp->tstamp = jiffies; 2992 ifp->valid_lft = valid_lft; 2993 ifp->prefered_lft = prefered_lft; 2994 2995 spin_unlock_bh(&ifp->lock); 2996 if (!(ifp->flags&IFA_F_TENTATIVE)) 2997 ipv6_ifa_notify(0, ifp); 2998 2999 addrconf_verify(0); 3000 3001 return 0; 3002 } 3003 3004 static int 3005 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3006 { 3007 struct ifaddrmsg *ifm; 3008 struct nlattr *tb[IFA_MAX+1]; 3009 struct in6_addr *pfx; 3010 struct inet6_ifaddr *ifa; 3011 struct net_device *dev; 3012 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3013 u8 ifa_flags; 3014 int err; 3015 3016 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3017 if (err < 0) 3018 return err; 3019 3020 ifm = nlmsg_data(nlh); 3021 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3022 if (pfx == NULL) 3023 return -EINVAL; 3024 3025 if (tb[IFA_CACHEINFO]) { 3026 struct ifa_cacheinfo *ci; 3027 3028 ci = nla_data(tb[IFA_CACHEINFO]); 3029 valid_lft = ci->ifa_valid; 3030 preferred_lft = ci->ifa_prefered; 3031 } else { 3032 preferred_lft = INFINITY_LIFE_TIME; 3033 valid_lft = INFINITY_LIFE_TIME; 3034 } 3035 3036 dev = __dev_get_by_index(ifm->ifa_index); 3037 if (dev == NULL) 3038 return -ENODEV; 3039 3040 /* We ignore other flags so far. */ 3041 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3042 3043 ifa = ipv6_get_ifaddr(pfx, dev, 1); 3044 if (ifa == NULL) { 3045 /* 3046 * It would be best to check for !NLM_F_CREATE here but 3047 * userspace alreay relies on not having to provide this. 3048 */ 3049 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 3050 ifa_flags, preferred_lft, valid_lft); 3051 } 3052 3053 if (nlh->nlmsg_flags & NLM_F_EXCL || 3054 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3055 err = -EEXIST; 3056 else 3057 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3058 3059 in6_ifa_put(ifa); 3060 3061 return err; 3062 } 3063 3064 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3065 u8 scope, int ifindex) 3066 { 3067 struct ifaddrmsg *ifm; 3068 3069 ifm = nlmsg_data(nlh); 3070 ifm->ifa_family = AF_INET6; 3071 ifm->ifa_prefixlen = prefixlen; 3072 ifm->ifa_flags = flags; 3073 ifm->ifa_scope = scope; 3074 ifm->ifa_index = ifindex; 3075 } 3076 3077 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3078 unsigned long tstamp, u32 preferred, u32 valid) 3079 { 3080 struct ifa_cacheinfo ci; 3081 3082 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3083 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3084 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3085 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3086 ci.ifa_prefered = preferred; 3087 ci.ifa_valid = valid; 3088 3089 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3090 } 3091 3092 static inline int rt_scope(int ifa_scope) 3093 { 3094 if (ifa_scope & IFA_HOST) 3095 return RT_SCOPE_HOST; 3096 else if (ifa_scope & IFA_LINK) 3097 return RT_SCOPE_LINK; 3098 else if (ifa_scope & IFA_SITE) 3099 return RT_SCOPE_SITE; 3100 else 3101 return RT_SCOPE_UNIVERSE; 3102 } 3103 3104 static inline int inet6_ifaddr_msgsize(void) 3105 { 3106 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3107 + nla_total_size(16) /* IFA_ADDRESS */ 3108 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3109 } 3110 3111 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3112 u32 pid, u32 seq, int event, unsigned int flags) 3113 { 3114 struct nlmsghdr *nlh; 3115 u32 preferred, valid; 3116 3117 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3118 if (nlh == NULL) 3119 return -EMSGSIZE; 3120 3121 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3122 ifa->idev->dev->ifindex); 3123 3124 if (!(ifa->flags&IFA_F_PERMANENT)) { 3125 preferred = ifa->prefered_lft; 3126 valid = ifa->valid_lft; 3127 if (preferred != INFINITY_LIFE_TIME) { 3128 long tval = (jiffies - ifa->tstamp)/HZ; 3129 preferred -= tval; 3130 if (valid != INFINITY_LIFE_TIME) 3131 valid -= tval; 3132 } 3133 } else { 3134 preferred = INFINITY_LIFE_TIME; 3135 valid = INFINITY_LIFE_TIME; 3136 } 3137 3138 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3139 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3140 nlmsg_cancel(skb, nlh); 3141 return -EMSGSIZE; 3142 } 3143 3144 return nlmsg_end(skb, nlh); 3145 } 3146 3147 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3148 u32 pid, u32 seq, int event, u16 flags) 3149 { 3150 struct nlmsghdr *nlh; 3151 u8 scope = RT_SCOPE_UNIVERSE; 3152 int ifindex = ifmca->idev->dev->ifindex; 3153 3154 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3155 scope = RT_SCOPE_SITE; 3156 3157 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3158 if (nlh == NULL) 3159 return -EMSGSIZE; 3160 3161 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3162 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3163 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3164 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3165 nlmsg_cancel(skb, nlh); 3166 return -EMSGSIZE; 3167 } 3168 3169 return nlmsg_end(skb, nlh); 3170 } 3171 3172 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3173 u32 pid, u32 seq, int event, unsigned int flags) 3174 { 3175 struct nlmsghdr *nlh; 3176 u8 scope = RT_SCOPE_UNIVERSE; 3177 int ifindex = ifaca->aca_idev->dev->ifindex; 3178 3179 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3180 scope = RT_SCOPE_SITE; 3181 3182 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3183 if (nlh == NULL) 3184 return -EMSGSIZE; 3185 3186 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3187 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3188 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3189 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3190 nlmsg_cancel(skb, nlh); 3191 return -EMSGSIZE; 3192 } 3193 3194 return nlmsg_end(skb, nlh); 3195 } 3196 3197 enum addr_type_t 3198 { 3199 UNICAST_ADDR, 3200 MULTICAST_ADDR, 3201 ANYCAST_ADDR, 3202 }; 3203 3204 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3205 enum addr_type_t type) 3206 { 3207 int idx, ip_idx; 3208 int s_idx, s_ip_idx; 3209 int err = 1; 3210 struct net_device *dev; 3211 struct inet6_dev *idev = NULL; 3212 struct inet6_ifaddr *ifa; 3213 struct ifmcaddr6 *ifmca; 3214 struct ifacaddr6 *ifaca; 3215 3216 s_idx = cb->args[0]; 3217 s_ip_idx = ip_idx = cb->args[1]; 3218 read_lock(&dev_base_lock); 3219 3220 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { 3221 if (idx < s_idx) 3222 continue; 3223 if (idx > s_idx) 3224 s_ip_idx = 0; 3225 ip_idx = 0; 3226 if ((idev = in6_dev_get(dev)) == NULL) 3227 continue; 3228 read_lock_bh(&idev->lock); 3229 switch (type) { 3230 case UNICAST_ADDR: 3231 /* unicast address incl. temp addr */ 3232 for (ifa = idev->addr_list; ifa; 3233 ifa = ifa->if_next, ip_idx++) { 3234 if (ip_idx < s_ip_idx) 3235 continue; 3236 if ((err = inet6_fill_ifaddr(skb, ifa, 3237 NETLINK_CB(cb->skb).pid, 3238 cb->nlh->nlmsg_seq, RTM_NEWADDR, 3239 NLM_F_MULTI)) <= 0) 3240 goto done; 3241 } 3242 break; 3243 case MULTICAST_ADDR: 3244 /* multicast address */ 3245 for (ifmca = idev->mc_list; ifmca; 3246 ifmca = ifmca->next, ip_idx++) { 3247 if (ip_idx < s_ip_idx) 3248 continue; 3249 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 3250 NETLINK_CB(cb->skb).pid, 3251 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 3252 NLM_F_MULTI)) <= 0) 3253 goto done; 3254 } 3255 break; 3256 case ANYCAST_ADDR: 3257 /* anycast address */ 3258 for (ifaca = idev->ac_list; ifaca; 3259 ifaca = ifaca->aca_next, ip_idx++) { 3260 if (ip_idx < s_ip_idx) 3261 continue; 3262 if ((err = inet6_fill_ifacaddr(skb, ifaca, 3263 NETLINK_CB(cb->skb).pid, 3264 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 3265 NLM_F_MULTI)) <= 0) 3266 goto done; 3267 } 3268 break; 3269 default: 3270 break; 3271 } 3272 read_unlock_bh(&idev->lock); 3273 in6_dev_put(idev); 3274 } 3275 done: 3276 if (err <= 0) { 3277 read_unlock_bh(&idev->lock); 3278 in6_dev_put(idev); 3279 } 3280 read_unlock(&dev_base_lock); 3281 cb->args[0] = idx; 3282 cb->args[1] = ip_idx; 3283 return skb->len; 3284 } 3285 3286 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3287 { 3288 enum addr_type_t type = UNICAST_ADDR; 3289 return inet6_dump_addr(skb, cb, type); 3290 } 3291 3292 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3293 { 3294 enum addr_type_t type = MULTICAST_ADDR; 3295 return inet6_dump_addr(skb, cb, type); 3296 } 3297 3298 3299 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3300 { 3301 enum addr_type_t type = ANYCAST_ADDR; 3302 return inet6_dump_addr(skb, cb, type); 3303 } 3304 3305 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3306 void *arg) 3307 { 3308 struct ifaddrmsg *ifm; 3309 struct nlattr *tb[IFA_MAX+1]; 3310 struct in6_addr *addr = NULL; 3311 struct net_device *dev = NULL; 3312 struct inet6_ifaddr *ifa; 3313 struct sk_buff *skb; 3314 int err; 3315 3316 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3317 if (err < 0) 3318 goto errout; 3319 3320 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3321 if (addr == NULL) { 3322 err = -EINVAL; 3323 goto errout; 3324 } 3325 3326 ifm = nlmsg_data(nlh); 3327 if (ifm->ifa_index) 3328 dev = __dev_get_by_index(ifm->ifa_index); 3329 3330 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) { 3331 err = -EADDRNOTAVAIL; 3332 goto errout; 3333 } 3334 3335 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3336 err = -ENOBUFS; 3337 goto errout_ifa; 3338 } 3339 3340 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3341 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3342 if (err < 0) { 3343 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3344 WARN_ON(err == -EMSGSIZE); 3345 kfree_skb(skb); 3346 goto errout_ifa; 3347 } 3348 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); 3349 errout_ifa: 3350 in6_ifa_put(ifa); 3351 errout: 3352 return err; 3353 } 3354 3355 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3356 { 3357 struct sk_buff *skb; 3358 int err = -ENOBUFS; 3359 3360 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3361 if (skb == NULL) 3362 goto errout; 3363 3364 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3365 if (err < 0) { 3366 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3367 WARN_ON(err == -EMSGSIZE); 3368 kfree_skb(skb); 3369 goto errout; 3370 } 3371 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3372 errout: 3373 if (err < 0) 3374 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3375 } 3376 3377 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf, 3378 __s32 *array, int bytes) 3379 { 3380 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3381 3382 memset(array, 0, bytes); 3383 array[DEVCONF_FORWARDING] = cnf->forwarding; 3384 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3385 array[DEVCONF_MTU6] = cnf->mtu6; 3386 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3387 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3388 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3389 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3390 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3391 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3392 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3393 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3394 #ifdef CONFIG_IPV6_PRIVACY 3395 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3396 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3397 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3398 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3399 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3400 #endif 3401 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3402 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3403 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3404 #ifdef CONFIG_IPV6_ROUTER_PREF 3405 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3406 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3407 #ifdef CONFIG_IPV6_ROUTE_INFO 3408 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3409 #endif 3410 #endif 3411 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3412 } 3413 3414 static inline size_t inet6_if_nlmsg_size(void) 3415 { 3416 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3417 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3418 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3419 + nla_total_size(4) /* IFLA_MTU */ 3420 + nla_total_size(4) /* IFLA_LINK */ 3421 + nla_total_size( /* IFLA_PROTINFO */ 3422 nla_total_size(4) /* IFLA_INET6_FLAGS */ 3423 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3424 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3425 ); 3426 } 3427 3428 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3429 u32 pid, u32 seq, int event, unsigned int flags) 3430 { 3431 struct net_device *dev = idev->dev; 3432 struct nlattr *conf; 3433 struct ifinfomsg *hdr; 3434 struct nlmsghdr *nlh; 3435 void *protoinfo; 3436 struct ifla_cacheinfo ci; 3437 3438 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 3439 if (nlh == NULL) 3440 return -EMSGSIZE; 3441 3442 hdr = nlmsg_data(nlh); 3443 hdr->ifi_family = AF_INET6; 3444 hdr->__ifi_pad = 0; 3445 hdr->ifi_type = dev->type; 3446 hdr->ifi_index = dev->ifindex; 3447 hdr->ifi_flags = dev_get_flags(dev); 3448 hdr->ifi_change = 0; 3449 3450 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 3451 3452 if (dev->addr_len) 3453 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3454 3455 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 3456 if (dev->ifindex != dev->iflink) 3457 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 3458 3459 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 3460 if (protoinfo == NULL) 3461 goto nla_put_failure; 3462 3463 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3464 3465 ci.max_reasm_len = IPV6_MAXPLEN; 3466 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3467 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3468 ci.reachable_time = idev->nd_parms->reachable_time; 3469 ci.retrans_time = idev->nd_parms->retrans_time; 3470 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3471 3472 conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3473 if (conf == NULL) 3474 goto nla_put_failure; 3475 ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf)); 3476 3477 /* XXX - Statistics/MC not implemented */ 3478 3479 nla_nest_end(skb, protoinfo); 3480 return nlmsg_end(skb, nlh); 3481 3482 nla_put_failure: 3483 nlmsg_cancel(skb, nlh); 3484 return -EMSGSIZE; 3485 } 3486 3487 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3488 { 3489 int idx, err; 3490 int s_idx = cb->args[0]; 3491 struct net_device *dev; 3492 struct inet6_dev *idev; 3493 3494 read_lock(&dev_base_lock); 3495 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { 3496 if (idx < s_idx) 3497 continue; 3498 if ((idev = in6_dev_get(dev)) == NULL) 3499 continue; 3500 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3501 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3502 in6_dev_put(idev); 3503 if (err <= 0) 3504 break; 3505 } 3506 read_unlock(&dev_base_lock); 3507 cb->args[0] = idx; 3508 3509 return skb->len; 3510 } 3511 3512 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3513 { 3514 struct sk_buff *skb; 3515 int err = -ENOBUFS; 3516 3517 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 3518 if (skb == NULL) 3519 goto errout; 3520 3521 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3522 if (err < 0) { 3523 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 3524 WARN_ON(err == -EMSGSIZE); 3525 kfree_skb(skb); 3526 goto errout; 3527 } 3528 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3529 errout: 3530 if (err < 0) 3531 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3532 } 3533 3534 static inline size_t inet6_prefix_nlmsg_size(void) 3535 { 3536 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 3537 + nla_total_size(sizeof(struct in6_addr)) 3538 + nla_total_size(sizeof(struct prefix_cacheinfo)); 3539 } 3540 3541 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3542 struct prefix_info *pinfo, u32 pid, u32 seq, 3543 int event, unsigned int flags) 3544 { 3545 struct prefixmsg *pmsg; 3546 struct nlmsghdr *nlh; 3547 struct prefix_cacheinfo ci; 3548 3549 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 3550 if (nlh == NULL) 3551 return -EMSGSIZE; 3552 3553 pmsg = nlmsg_data(nlh); 3554 pmsg->prefix_family = AF_INET6; 3555 pmsg->prefix_pad1 = 0; 3556 pmsg->prefix_pad2 = 0; 3557 pmsg->prefix_ifindex = idev->dev->ifindex; 3558 pmsg->prefix_len = pinfo->prefix_len; 3559 pmsg->prefix_type = pinfo->type; 3560 pmsg->prefix_pad3 = 0; 3561 pmsg->prefix_flags = 0; 3562 if (pinfo->onlink) 3563 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3564 if (pinfo->autoconf) 3565 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3566 3567 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3568 3569 ci.preferred_time = ntohl(pinfo->prefered); 3570 ci.valid_time = ntohl(pinfo->valid); 3571 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3572 3573 return nlmsg_end(skb, nlh); 3574 3575 nla_put_failure: 3576 nlmsg_cancel(skb, nlh); 3577 return -EMSGSIZE; 3578 } 3579 3580 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3581 struct prefix_info *pinfo) 3582 { 3583 struct sk_buff *skb; 3584 int err = -ENOBUFS; 3585 3586 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 3587 if (skb == NULL) 3588 goto errout; 3589 3590 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3591 if (err < 0) { 3592 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 3593 WARN_ON(err == -EMSGSIZE); 3594 kfree_skb(skb); 3595 goto errout; 3596 } 3597 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3598 errout: 3599 if (err < 0) 3600 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err); 3601 } 3602 3603 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = { 3604 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, }, 3605 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, }, 3606 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, }, 3607 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr, 3608 .dumpit = inet6_dump_ifaddr, }, 3609 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, }, 3610 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, }, 3611 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, }, 3612 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, }, 3613 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute, 3614 .dumpit = inet6_dump_fib, }, 3615 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3616 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, }, 3617 #endif 3618 }; 3619 3620 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3621 { 3622 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3623 3624 switch (event) { 3625 case RTM_NEWADDR: 3626 ip6_ins_rt(ifp->rt); 3627 if (ifp->idev->cnf.forwarding) 3628 addrconf_join_anycast(ifp); 3629 break; 3630 case RTM_DELADDR: 3631 if (ifp->idev->cnf.forwarding) 3632 addrconf_leave_anycast(ifp); 3633 addrconf_leave_solict(ifp->idev, &ifp->addr); 3634 dst_hold(&ifp->rt->u.dst); 3635 if (ip6_del_rt(ifp->rt)) 3636 dst_free(&ifp->rt->u.dst); 3637 break; 3638 } 3639 } 3640 3641 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3642 { 3643 rcu_read_lock_bh(); 3644 if (likely(ifp->idev->dead == 0)) 3645 __ipv6_ifa_notify(event, ifp); 3646 rcu_read_unlock_bh(); 3647 } 3648 3649 #ifdef CONFIG_SYSCTL 3650 3651 static 3652 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3653 void __user *buffer, size_t *lenp, loff_t *ppos) 3654 { 3655 int *valp = ctl->data; 3656 int val = *valp; 3657 int ret; 3658 3659 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3660 3661 if (write && valp != &ipv6_devconf_dflt.forwarding) { 3662 if (valp != &ipv6_devconf.forwarding) { 3663 if ((!*valp) ^ (!val)) { 3664 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 3665 if (idev == NULL) 3666 return ret; 3667 dev_forward_change(idev); 3668 } 3669 } else { 3670 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; 3671 addrconf_forward_change(); 3672 } 3673 if (*valp) 3674 rt6_purge_dflt_routers(); 3675 } 3676 3677 return ret; 3678 } 3679 3680 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3681 int __user *name, int nlen, 3682 void __user *oldval, 3683 size_t __user *oldlenp, 3684 void __user *newval, size_t newlen) 3685 { 3686 int *valp = table->data; 3687 int new; 3688 3689 if (!newval || !newlen) 3690 return 0; 3691 if (newlen != sizeof(int)) 3692 return -EINVAL; 3693 if (get_user(new, (int __user *)newval)) 3694 return -EFAULT; 3695 if (new == *valp) 3696 return 0; 3697 if (oldval && oldlenp) { 3698 size_t len; 3699 if (get_user(len, oldlenp)) 3700 return -EFAULT; 3701 if (len) { 3702 if (len > table->maxlen) 3703 len = table->maxlen; 3704 if (copy_to_user(oldval, valp, len)) 3705 return -EFAULT; 3706 if (put_user(len, oldlenp)) 3707 return -EFAULT; 3708 } 3709 } 3710 3711 if (valp != &ipv6_devconf_dflt.forwarding) { 3712 if (valp != &ipv6_devconf.forwarding) { 3713 struct inet6_dev *idev = (struct inet6_dev *)table->extra1; 3714 int changed; 3715 if (unlikely(idev == NULL)) 3716 return -ENODEV; 3717 changed = (!*valp) ^ (!new); 3718 *valp = new; 3719 if (changed) 3720 dev_forward_change(idev); 3721 } else { 3722 *valp = new; 3723 addrconf_forward_change(); 3724 } 3725 3726 if (*valp) 3727 rt6_purge_dflt_routers(); 3728 } else 3729 *valp = new; 3730 3731 return 1; 3732 } 3733 3734 static struct addrconf_sysctl_table 3735 { 3736 struct ctl_table_header *sysctl_header; 3737 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3738 ctl_table addrconf_dev[2]; 3739 ctl_table addrconf_conf_dir[2]; 3740 ctl_table addrconf_proto_dir[2]; 3741 ctl_table addrconf_root_dir[2]; 3742 } addrconf_sysctl __read_mostly = { 3743 .sysctl_header = NULL, 3744 .addrconf_vars = { 3745 { 3746 .ctl_name = NET_IPV6_FORWARDING, 3747 .procname = "forwarding", 3748 .data = &ipv6_devconf.forwarding, 3749 .maxlen = sizeof(int), 3750 .mode = 0644, 3751 .proc_handler = &addrconf_sysctl_forward, 3752 .strategy = &addrconf_sysctl_forward_strategy, 3753 }, 3754 { 3755 .ctl_name = NET_IPV6_HOP_LIMIT, 3756 .procname = "hop_limit", 3757 .data = &ipv6_devconf.hop_limit, 3758 .maxlen = sizeof(int), 3759 .mode = 0644, 3760 .proc_handler = proc_dointvec, 3761 }, 3762 { 3763 .ctl_name = NET_IPV6_MTU, 3764 .procname = "mtu", 3765 .data = &ipv6_devconf.mtu6, 3766 .maxlen = sizeof(int), 3767 .mode = 0644, 3768 .proc_handler = &proc_dointvec, 3769 }, 3770 { 3771 .ctl_name = NET_IPV6_ACCEPT_RA, 3772 .procname = "accept_ra", 3773 .data = &ipv6_devconf.accept_ra, 3774 .maxlen = sizeof(int), 3775 .mode = 0644, 3776 .proc_handler = &proc_dointvec, 3777 }, 3778 { 3779 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3780 .procname = "accept_redirects", 3781 .data = &ipv6_devconf.accept_redirects, 3782 .maxlen = sizeof(int), 3783 .mode = 0644, 3784 .proc_handler = &proc_dointvec, 3785 }, 3786 { 3787 .ctl_name = NET_IPV6_AUTOCONF, 3788 .procname = "autoconf", 3789 .data = &ipv6_devconf.autoconf, 3790 .maxlen = sizeof(int), 3791 .mode = 0644, 3792 .proc_handler = &proc_dointvec, 3793 }, 3794 { 3795 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3796 .procname = "dad_transmits", 3797 .data = &ipv6_devconf.dad_transmits, 3798 .maxlen = sizeof(int), 3799 .mode = 0644, 3800 .proc_handler = &proc_dointvec, 3801 }, 3802 { 3803 .ctl_name = NET_IPV6_RTR_SOLICITS, 3804 .procname = "router_solicitations", 3805 .data = &ipv6_devconf.rtr_solicits, 3806 .maxlen = sizeof(int), 3807 .mode = 0644, 3808 .proc_handler = &proc_dointvec, 3809 }, 3810 { 3811 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3812 .procname = "router_solicitation_interval", 3813 .data = &ipv6_devconf.rtr_solicit_interval, 3814 .maxlen = sizeof(int), 3815 .mode = 0644, 3816 .proc_handler = &proc_dointvec_jiffies, 3817 .strategy = &sysctl_jiffies, 3818 }, 3819 { 3820 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3821 .procname = "router_solicitation_delay", 3822 .data = &ipv6_devconf.rtr_solicit_delay, 3823 .maxlen = sizeof(int), 3824 .mode = 0644, 3825 .proc_handler = &proc_dointvec_jiffies, 3826 .strategy = &sysctl_jiffies, 3827 }, 3828 { 3829 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3830 .procname = "force_mld_version", 3831 .data = &ipv6_devconf.force_mld_version, 3832 .maxlen = sizeof(int), 3833 .mode = 0644, 3834 .proc_handler = &proc_dointvec, 3835 }, 3836 #ifdef CONFIG_IPV6_PRIVACY 3837 { 3838 .ctl_name = NET_IPV6_USE_TEMPADDR, 3839 .procname = "use_tempaddr", 3840 .data = &ipv6_devconf.use_tempaddr, 3841 .maxlen = sizeof(int), 3842 .mode = 0644, 3843 .proc_handler = &proc_dointvec, 3844 }, 3845 { 3846 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3847 .procname = "temp_valid_lft", 3848 .data = &ipv6_devconf.temp_valid_lft, 3849 .maxlen = sizeof(int), 3850 .mode = 0644, 3851 .proc_handler = &proc_dointvec, 3852 }, 3853 { 3854 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3855 .procname = "temp_prefered_lft", 3856 .data = &ipv6_devconf.temp_prefered_lft, 3857 .maxlen = sizeof(int), 3858 .mode = 0644, 3859 .proc_handler = &proc_dointvec, 3860 }, 3861 { 3862 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3863 .procname = "regen_max_retry", 3864 .data = &ipv6_devconf.regen_max_retry, 3865 .maxlen = sizeof(int), 3866 .mode = 0644, 3867 .proc_handler = &proc_dointvec, 3868 }, 3869 { 3870 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3871 .procname = "max_desync_factor", 3872 .data = &ipv6_devconf.max_desync_factor, 3873 .maxlen = sizeof(int), 3874 .mode = 0644, 3875 .proc_handler = &proc_dointvec, 3876 }, 3877 #endif 3878 { 3879 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3880 .procname = "max_addresses", 3881 .data = &ipv6_devconf.max_addresses, 3882 .maxlen = sizeof(int), 3883 .mode = 0644, 3884 .proc_handler = &proc_dointvec, 3885 }, 3886 { 3887 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 3888 .procname = "accept_ra_defrtr", 3889 .data = &ipv6_devconf.accept_ra_defrtr, 3890 .maxlen = sizeof(int), 3891 .mode = 0644, 3892 .proc_handler = &proc_dointvec, 3893 }, 3894 { 3895 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 3896 .procname = "accept_ra_pinfo", 3897 .data = &ipv6_devconf.accept_ra_pinfo, 3898 .maxlen = sizeof(int), 3899 .mode = 0644, 3900 .proc_handler = &proc_dointvec, 3901 }, 3902 #ifdef CONFIG_IPV6_ROUTER_PREF 3903 { 3904 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 3905 .procname = "accept_ra_rtr_pref", 3906 .data = &ipv6_devconf.accept_ra_rtr_pref, 3907 .maxlen = sizeof(int), 3908 .mode = 0644, 3909 .proc_handler = &proc_dointvec, 3910 }, 3911 { 3912 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 3913 .procname = "router_probe_interval", 3914 .data = &ipv6_devconf.rtr_probe_interval, 3915 .maxlen = sizeof(int), 3916 .mode = 0644, 3917 .proc_handler = &proc_dointvec_jiffies, 3918 .strategy = &sysctl_jiffies, 3919 }, 3920 #ifdef CONFIG_IPV6_ROUTE_INFO 3921 { 3922 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 3923 .procname = "accept_ra_rt_info_max_plen", 3924 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 3925 .maxlen = sizeof(int), 3926 .mode = 0644, 3927 .proc_handler = &proc_dointvec, 3928 }, 3929 #endif 3930 #endif 3931 { 3932 .ctl_name = NET_IPV6_PROXY_NDP, 3933 .procname = "proxy_ndp", 3934 .data = &ipv6_devconf.proxy_ndp, 3935 .maxlen = sizeof(int), 3936 .mode = 0644, 3937 .proc_handler = &proc_dointvec, 3938 }, 3939 { 3940 .ctl_name = 0, /* sentinel */ 3941 } 3942 }, 3943 .addrconf_dev = { 3944 { 3945 .ctl_name = NET_PROTO_CONF_ALL, 3946 .procname = "all", 3947 .mode = 0555, 3948 .child = addrconf_sysctl.addrconf_vars, 3949 }, 3950 { 3951 .ctl_name = 0, /* sentinel */ 3952 } 3953 }, 3954 .addrconf_conf_dir = { 3955 { 3956 .ctl_name = NET_IPV6_CONF, 3957 .procname = "conf", 3958 .mode = 0555, 3959 .child = addrconf_sysctl.addrconf_dev, 3960 }, 3961 { 3962 .ctl_name = 0, /* sentinel */ 3963 } 3964 }, 3965 .addrconf_proto_dir = { 3966 { 3967 .ctl_name = NET_IPV6, 3968 .procname = "ipv6", 3969 .mode = 0555, 3970 .child = addrconf_sysctl.addrconf_conf_dir, 3971 }, 3972 { 3973 .ctl_name = 0, /* sentinel */ 3974 } 3975 }, 3976 .addrconf_root_dir = { 3977 { 3978 .ctl_name = CTL_NET, 3979 .procname = "net", 3980 .mode = 0555, 3981 .child = addrconf_sysctl.addrconf_proto_dir, 3982 }, 3983 { 3984 .ctl_name = 0, /* sentinel */ 3985 } 3986 }, 3987 }; 3988 3989 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) 3990 { 3991 int i; 3992 struct net_device *dev = idev ? idev->dev : NULL; 3993 struct addrconf_sysctl_table *t; 3994 char *dev_name = NULL; 3995 3996 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 3997 if (t == NULL) 3998 return; 3999 for (i=0; t->addrconf_vars[i].data; i++) { 4000 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 4001 t->addrconf_vars[i].de = NULL; 4002 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4003 } 4004 if (dev) { 4005 dev_name = dev->name; 4006 t->addrconf_dev[0].ctl_name = dev->ifindex; 4007 } else { 4008 dev_name = "default"; 4009 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 4010 } 4011 4012 /* 4013 * Make a copy of dev_name, because '.procname' is regarded as const 4014 * by sysctl and we wouldn't want anyone to change it under our feet 4015 * (see SIOCSIFNAME). 4016 */ 4017 dev_name = kstrdup(dev_name, GFP_KERNEL); 4018 if (!dev_name) 4019 goto free; 4020 4021 t->addrconf_dev[0].procname = dev_name; 4022 4023 t->addrconf_dev[0].child = t->addrconf_vars; 4024 t->addrconf_dev[0].de = NULL; 4025 t->addrconf_conf_dir[0].child = t->addrconf_dev; 4026 t->addrconf_conf_dir[0].de = NULL; 4027 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; 4028 t->addrconf_proto_dir[0].de = NULL; 4029 t->addrconf_root_dir[0].child = t->addrconf_proto_dir; 4030 t->addrconf_root_dir[0].de = NULL; 4031 4032 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0); 4033 if (t->sysctl_header == NULL) 4034 goto free_procname; 4035 else 4036 p->sysctl = t; 4037 return; 4038 4039 /* error path */ 4040 free_procname: 4041 kfree(dev_name); 4042 free: 4043 kfree(t); 4044 4045 return; 4046 } 4047 4048 static void addrconf_sysctl_unregister(struct ipv6_devconf *p) 4049 { 4050 if (p->sysctl) { 4051 struct addrconf_sysctl_table *t = p->sysctl; 4052 p->sysctl = NULL; 4053 unregister_sysctl_table(t->sysctl_header); 4054 kfree(t->addrconf_dev[0].procname); 4055 kfree(t); 4056 } 4057 } 4058 4059 4060 #endif 4061 4062 /* 4063 * Device notifier 4064 */ 4065 4066 int register_inet6addr_notifier(struct notifier_block *nb) 4067 { 4068 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4069 } 4070 4071 int unregister_inet6addr_notifier(struct notifier_block *nb) 4072 { 4073 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4074 } 4075 4076 /* 4077 * Init / cleanup code 4078 */ 4079 4080 int __init addrconf_init(void) 4081 { 4082 int err = 0; 4083 4084 /* The addrconf netdev notifier requires that loopback_dev 4085 * has it's ipv6 private information allocated and setup 4086 * before it can bring up and give link-local addresses 4087 * to other devices which are up. 4088 * 4089 * Unfortunately, loopback_dev is not necessarily the first 4090 * entry in the global dev_base list of net devices. In fact, 4091 * it is likely to be the very last entry on that list. 4092 * So this causes the notifier registry below to try and 4093 * give link-local addresses to all devices besides loopback_dev 4094 * first, then loopback_dev, which cases all the non-loopback_dev 4095 * devices to fail to get a link-local address. 4096 * 4097 * So, as a temporary fix, allocate the ipv6 structure for 4098 * loopback_dev first by hand. 4099 * Longer term, all of the dependencies ipv6 has upon the loopback 4100 * device and it being up should be removed. 4101 */ 4102 rtnl_lock(); 4103 if (!ipv6_add_dev(&loopback_dev)) 4104 err = -ENOMEM; 4105 rtnl_unlock(); 4106 if (err) 4107 return err; 4108 4109 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev); 4110 4111 register_netdevice_notifier(&ipv6_dev_notf); 4112 4113 addrconf_verify(0); 4114 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table; 4115 #ifdef CONFIG_SYSCTL 4116 addrconf_sysctl.sysctl_header = 4117 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0); 4118 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); 4119 #endif 4120 4121 return 0; 4122 } 4123 4124 void __exit addrconf_cleanup(void) 4125 { 4126 struct net_device *dev; 4127 struct inet6_dev *idev; 4128 struct inet6_ifaddr *ifa; 4129 int i; 4130 4131 unregister_netdevice_notifier(&ipv6_dev_notf); 4132 4133 rtnetlink_links[PF_INET6] = NULL; 4134 #ifdef CONFIG_SYSCTL 4135 addrconf_sysctl_unregister(&ipv6_devconf_dflt); 4136 addrconf_sysctl_unregister(&ipv6_devconf); 4137 #endif 4138 4139 rtnl_lock(); 4140 4141 /* 4142 * clean dev list. 4143 */ 4144 4145 for (dev=dev_base; dev; dev=dev->next) { 4146 if ((idev = __in6_dev_get(dev)) == NULL) 4147 continue; 4148 addrconf_ifdown(dev, 1); 4149 } 4150 addrconf_ifdown(&loopback_dev, 2); 4151 4152 /* 4153 * Check hash table. 4154 */ 4155 4156 write_lock_bh(&addrconf_hash_lock); 4157 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4158 for (ifa=inet6_addr_lst[i]; ifa; ) { 4159 struct inet6_ifaddr *bifa; 4160 4161 bifa = ifa; 4162 ifa = ifa->lst_next; 4163 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4164 /* Do not free it; something is wrong. 4165 Now we can investigate it with debugger. 4166 */ 4167 } 4168 } 4169 write_unlock_bh(&addrconf_hash_lock); 4170 4171 del_timer(&addr_chk_timer); 4172 4173 rtnl_unlock(); 4174 4175 #ifdef CONFIG_PROC_FS 4176 proc_net_remove("if_inet6"); 4177 #endif 4178 } 4179