1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 /* 18 * Changes: 19 * 20 * Janos Farkas : delete timer on ifdown 21 * <chexum@bankinf.banki.hu> 22 * Andi Kleen : kill double kfree on module 23 * unload. 24 * Maciej W. Rozycki : FDDI support 25 * sekiya@USAGI : Don't send too many RS 26 * packets. 27 * yoshfuji@USAGI : Fixed interval between DAD 28 * packets. 29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 30 * address validation timer. 31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 32 * support. 33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 34 * address on a same interface. 35 * YOSHIFUJI Hideaki @USAGI : ARCnet support 36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 37 * seq_file. 38 * YOSHIFUJI Hideaki @USAGI : improved source address 39 * selection; consider scope, 40 * status etc. 41 */ 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/socket.h> 46 #include <linux/sockios.h> 47 #include <linux/sched.h> 48 #include <linux/net.h> 49 #include <linux/in6.h> 50 #include <linux/netdevice.h> 51 #include <linux/if_addr.h> 52 #include <linux/if_arp.h> 53 #include <linux/if_arcnet.h> 54 #include <linux/if_infiniband.h> 55 #include <linux/route.h> 56 #include <linux/inetdevice.h> 57 #include <linux/init.h> 58 #ifdef CONFIG_SYSCTL 59 #include <linux/sysctl.h> 60 #endif 61 #include <linux/capability.h> 62 #include <linux/delay.h> 63 #include <linux/notifier.h> 64 #include <linux/string.h> 65 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <linux/if_tunnel.h> 78 #include <linux/rtnetlink.h> 79 80 #ifdef CONFIG_IPV6_PRIVACY 81 #include <linux/random.h> 82 #endif 83 84 #include <asm/uaccess.h> 85 86 #include <linux/proc_fs.h> 87 #include <linux/seq_file.h> 88 89 /* Set to 3 to get tracing... */ 90 #define ACONF_DEBUG 2 91 92 #if ACONF_DEBUG >= 3 93 #define ADBG(x) printk x 94 #else 95 #define ADBG(x) 96 #endif 97 98 #define INFINITY_LIFE_TIME 0xFFFFFFFF 99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 100 101 #ifdef CONFIG_SYSCTL 102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p); 103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p); 104 #endif 105 106 #ifdef CONFIG_IPV6_PRIVACY 107 static int __ipv6_regen_rndid(struct inet6_dev *idev); 108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 109 static void ipv6_regen_rndid(unsigned long data); 110 111 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 112 #endif 113 114 static int ipv6_count_addresses(struct inet6_dev *idev); 115 116 /* 117 * Configured unicast address hash table 118 */ 119 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 120 static DEFINE_RWLOCK(addrconf_hash_lock); 121 122 static void addrconf_verify(unsigned long); 123 124 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 125 static DEFINE_SPINLOCK(addrconf_verify_lock); 126 127 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 128 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 129 130 static int addrconf_ifdown(struct net_device *dev, int how); 131 132 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 133 static void addrconf_dad_timer(unsigned long data); 134 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 135 static void addrconf_dad_run(struct inet6_dev *idev); 136 static void addrconf_rs_timer(unsigned long data); 137 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 139 140 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 141 struct prefix_info *pinfo); 142 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); 143 144 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 145 146 struct ipv6_devconf ipv6_devconf __read_mostly = { 147 .forwarding = 0, 148 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 149 .mtu6 = IPV6_MIN_MTU, 150 .accept_ra = 1, 151 .accept_redirects = 1, 152 .autoconf = 1, 153 .force_mld_version = 0, 154 .dad_transmits = 1, 155 .rtr_solicits = MAX_RTR_SOLICITATIONS, 156 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 157 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 158 #ifdef CONFIG_IPV6_PRIVACY 159 .use_tempaddr = 0, 160 .temp_valid_lft = TEMP_VALID_LIFETIME, 161 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 162 .regen_max_retry = REGEN_MAX_RETRY, 163 .max_desync_factor = MAX_DESYNC_FACTOR, 164 #endif 165 .max_addresses = IPV6_MAX_ADDRESSES, 166 .accept_ra_defrtr = 1, 167 .accept_ra_pinfo = 1, 168 #ifdef CONFIG_IPV6_ROUTER_PREF 169 .accept_ra_rtr_pref = 1, 170 .rtr_probe_interval = 60 * HZ, 171 #ifdef CONFIG_IPV6_ROUTE_INFO 172 .accept_ra_rt_info_max_plen = 0, 173 #endif 174 #endif 175 .proxy_ndp = 0, 176 }; 177 178 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 179 .forwarding = 0, 180 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 181 .mtu6 = IPV6_MIN_MTU, 182 .accept_ra = 1, 183 .accept_redirects = 1, 184 .autoconf = 1, 185 .dad_transmits = 1, 186 .rtr_solicits = MAX_RTR_SOLICITATIONS, 187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 189 #ifdef CONFIG_IPV6_PRIVACY 190 .use_tempaddr = 0, 191 .temp_valid_lft = TEMP_VALID_LIFETIME, 192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 193 .regen_max_retry = REGEN_MAX_RETRY, 194 .max_desync_factor = MAX_DESYNC_FACTOR, 195 #endif 196 .max_addresses = IPV6_MAX_ADDRESSES, 197 .accept_ra_defrtr = 1, 198 .accept_ra_pinfo = 1, 199 #ifdef CONFIG_IPV6_ROUTER_PREF 200 .accept_ra_rtr_pref = 1, 201 .rtr_probe_interval = 60 * HZ, 202 #ifdef CONFIG_IPV6_ROUTE_INFO 203 .accept_ra_rt_info_max_plen = 0, 204 #endif 205 #endif 206 .proxy_ndp = 0, 207 }; 208 209 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 210 #if 0 211 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 212 #endif 213 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 214 215 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16) 216 217 static inline unsigned ipv6_addr_scope2type(unsigned scope) 218 { 219 switch(scope) { 220 case IPV6_ADDR_SCOPE_NODELOCAL: 221 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) | 222 IPV6_ADDR_LOOPBACK); 223 case IPV6_ADDR_SCOPE_LINKLOCAL: 224 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) | 225 IPV6_ADDR_LINKLOCAL); 226 case IPV6_ADDR_SCOPE_SITELOCAL: 227 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) | 228 IPV6_ADDR_SITELOCAL); 229 } 230 return IPV6_ADDR_SCOPE_TYPE(scope); 231 } 232 233 int __ipv6_addr_type(const struct in6_addr *addr) 234 { 235 u32 st; 236 237 st = addr->s6_addr32[0]; 238 239 /* Consider all addresses with the first three bits different of 240 000 and 111 as unicasts. 241 */ 242 if ((st & htonl(0xE0000000)) != htonl(0x00000000) && 243 (st & htonl(0xE0000000)) != htonl(0xE0000000)) 244 return (IPV6_ADDR_UNICAST | 245 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); 246 247 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) { 248 /* multicast */ 249 /* addr-select 3.1 */ 250 return (IPV6_ADDR_MULTICAST | 251 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr))); 252 } 253 254 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000)) 255 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 256 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */ 257 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000)) 258 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST | 259 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */ 260 261 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) { 262 if (addr->s6_addr32[2] == 0) { 263 if (addr->s6_addr32[3] == 0) 264 return IPV6_ADDR_ANY; 265 266 if (addr->s6_addr32[3] == htonl(0x00000001)) 267 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST | 268 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */ 269 270 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST | 271 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 272 } 273 274 if (addr->s6_addr32[2] == htonl(0x0000ffff)) 275 return (IPV6_ADDR_MAPPED | 276 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 277 } 278 279 return (IPV6_ADDR_RESERVED | 280 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */ 281 } 282 283 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 284 { 285 if (del_timer(&ifp->timer)) 286 __in6_ifa_put(ifp); 287 } 288 289 enum addrconf_timer_t 290 { 291 AC_NONE, 292 AC_DAD, 293 AC_RS, 294 }; 295 296 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 297 enum addrconf_timer_t what, 298 unsigned long when) 299 { 300 if (!del_timer(&ifp->timer)) 301 in6_ifa_hold(ifp); 302 303 switch (what) { 304 case AC_DAD: 305 ifp->timer.function = addrconf_dad_timer; 306 break; 307 case AC_RS: 308 ifp->timer.function = addrconf_rs_timer; 309 break; 310 default:; 311 } 312 ifp->timer.expires = jiffies + when; 313 add_timer(&ifp->timer); 314 } 315 316 /* Nobody refers to this device, we may destroy it. */ 317 318 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 319 { 320 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 321 kfree(idev); 322 } 323 324 void in6_dev_finish_destroy(struct inet6_dev *idev) 325 { 326 struct net_device *dev = idev->dev; 327 BUG_TRAP(idev->addr_list==NULL); 328 BUG_TRAP(idev->mc_list==NULL); 329 #ifdef NET_REFCNT_DEBUG 330 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 331 #endif 332 dev_put(dev); 333 if (!idev->dead) { 334 printk("Freeing alive inet6 device %p\n", idev); 335 return; 336 } 337 snmp6_free_dev(idev); 338 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 339 } 340 341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 342 { 343 struct inet6_dev *ndev; 344 345 ASSERT_RTNL(); 346 347 if (dev->mtu < IPV6_MIN_MTU) 348 return NULL; 349 350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 351 352 if (ndev == NULL) 353 return NULL; 354 355 rwlock_init(&ndev->lock); 356 ndev->dev = dev; 357 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf)); 358 ndev->cnf.mtu6 = dev->mtu; 359 ndev->cnf.sysctl = NULL; 360 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 361 if (ndev->nd_parms == NULL) { 362 kfree(ndev); 363 return NULL; 364 } 365 /* We refer to the device */ 366 dev_hold(dev); 367 368 if (snmp6_alloc_dev(ndev) < 0) { 369 ADBG((KERN_WARNING 370 "%s(): cannot allocate memory for statistics; dev=%s.\n", 371 __FUNCTION__, dev->name)); 372 neigh_parms_release(&nd_tbl, ndev->nd_parms); 373 ndev->dead = 1; 374 in6_dev_finish_destroy(ndev); 375 return NULL; 376 } 377 378 if (snmp6_register_dev(ndev) < 0) { 379 ADBG((KERN_WARNING 380 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 381 __FUNCTION__, dev->name)); 382 neigh_parms_release(&nd_tbl, ndev->nd_parms); 383 ndev->dead = 1; 384 in6_dev_finish_destroy(ndev); 385 return NULL; 386 } 387 388 /* One reference from device. We must do this before 389 * we invoke __ipv6_regen_rndid(). 390 */ 391 in6_dev_hold(ndev); 392 393 #ifdef CONFIG_IPV6_PRIVACY 394 init_timer(&ndev->regen_timer); 395 ndev->regen_timer.function = ipv6_regen_rndid; 396 ndev->regen_timer.data = (unsigned long) ndev; 397 if ((dev->flags&IFF_LOOPBACK) || 398 dev->type == ARPHRD_TUNNEL || 399 dev->type == ARPHRD_NONE || 400 dev->type == ARPHRD_SIT) { 401 printk(KERN_INFO 402 "%s: Disabled Privacy Extensions\n", 403 dev->name); 404 ndev->cnf.use_tempaddr = -1; 405 } else { 406 in6_dev_hold(ndev); 407 ipv6_regen_rndid((unsigned long) ndev); 408 } 409 #endif 410 411 if (netif_carrier_ok(dev)) 412 ndev->if_flags |= IF_READY; 413 414 /* protected by rtnl_lock */ 415 rcu_assign_pointer(dev->ip6_ptr, ndev); 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 return ndev; 427 } 428 429 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 430 { 431 struct inet6_dev *idev; 432 433 ASSERT_RTNL(); 434 435 if ((idev = __in6_dev_get(dev)) == NULL) { 436 if ((idev = ipv6_add_dev(dev)) == NULL) 437 return NULL; 438 } 439 440 if (dev->flags&IFF_UP) 441 ipv6_mc_up(idev); 442 return idev; 443 } 444 445 #ifdef CONFIG_SYSCTL 446 static void dev_forward_change(struct inet6_dev *idev) 447 { 448 struct net_device *dev; 449 struct inet6_ifaddr *ifa; 450 struct in6_addr addr; 451 452 if (!idev) 453 return; 454 dev = idev->dev; 455 if (dev && (dev->flags & IFF_MULTICAST)) { 456 ipv6_addr_all_routers(&addr); 457 458 if (idev->cnf.forwarding) 459 ipv6_dev_mc_inc(dev, &addr); 460 else 461 ipv6_dev_mc_dec(dev, &addr); 462 } 463 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 464 if (idev->cnf.forwarding) 465 addrconf_join_anycast(ifa); 466 else 467 addrconf_leave_anycast(ifa); 468 } 469 } 470 471 472 static void addrconf_forward_change(void) 473 { 474 struct net_device *dev; 475 struct inet6_dev *idev; 476 477 read_lock(&dev_base_lock); 478 for (dev=dev_base; dev; dev=dev->next) { 479 rcu_read_lock(); 480 idev = __in6_dev_get(dev); 481 if (idev) { 482 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); 483 idev->cnf.forwarding = ipv6_devconf.forwarding; 484 if (changed) 485 dev_forward_change(idev); 486 } 487 rcu_read_unlock(); 488 } 489 read_unlock(&dev_base_lock); 490 } 491 #endif 492 493 /* Nobody refers to this ifaddr, destroy it */ 494 495 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 496 { 497 BUG_TRAP(ifp->if_next==NULL); 498 BUG_TRAP(ifp->lst_next==NULL); 499 #ifdef NET_REFCNT_DEBUG 500 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 501 #endif 502 503 in6_dev_put(ifp->idev); 504 505 if (del_timer(&ifp->timer)) 506 printk("Timer is still running, when freeing ifa=%p\n", ifp); 507 508 if (!ifp->dead) { 509 printk("Freeing alive inet6 address %p\n", ifp); 510 return; 511 } 512 dst_release(&ifp->rt->u.dst); 513 514 kfree(ifp); 515 } 516 517 static void 518 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 519 { 520 struct inet6_ifaddr *ifa, **ifap; 521 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 522 523 /* 524 * Each device address list is sorted in order of scope - 525 * global before linklocal. 526 */ 527 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 528 ifap = &ifa->if_next) { 529 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 530 break; 531 } 532 533 ifp->if_next = *ifap; 534 *ifap = ifp; 535 } 536 537 /* On success it returns ifp with increased reference count */ 538 539 static struct inet6_ifaddr * 540 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 541 int scope, u32 flags) 542 { 543 struct inet6_ifaddr *ifa = NULL; 544 struct rt6_info *rt; 545 int hash; 546 int err = 0; 547 548 rcu_read_lock_bh(); 549 if (idev->dead) { 550 err = -ENODEV; /*XXX*/ 551 goto out2; 552 } 553 554 write_lock(&addrconf_hash_lock); 555 556 /* Ignore adding duplicate addresses on an interface */ 557 if (ipv6_chk_same_addr(addr, idev->dev)) { 558 ADBG(("ipv6_add_addr: already assigned\n")); 559 err = -EEXIST; 560 goto out; 561 } 562 563 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 564 565 if (ifa == NULL) { 566 ADBG(("ipv6_add_addr: malloc failed\n")); 567 err = -ENOBUFS; 568 goto out; 569 } 570 571 rt = addrconf_dst_alloc(idev, addr, 0); 572 if (IS_ERR(rt)) { 573 err = PTR_ERR(rt); 574 goto out; 575 } 576 577 ipv6_addr_copy(&ifa->addr, addr); 578 579 spin_lock_init(&ifa->lock); 580 init_timer(&ifa->timer); 581 ifa->timer.data = (unsigned long) ifa; 582 ifa->scope = scope; 583 ifa->prefix_len = pfxlen; 584 ifa->flags = flags | IFA_F_TENTATIVE; 585 ifa->cstamp = ifa->tstamp = jiffies; 586 587 ifa->rt = rt; 588 589 ifa->idev = idev; 590 in6_dev_hold(idev); 591 /* For caller */ 592 in6_ifa_hold(ifa); 593 594 /* Add to big hash table */ 595 hash = ipv6_addr_hash(addr); 596 597 ifa->lst_next = inet6_addr_lst[hash]; 598 inet6_addr_lst[hash] = ifa; 599 in6_ifa_hold(ifa); 600 write_unlock(&addrconf_hash_lock); 601 602 write_lock(&idev->lock); 603 /* Add to inet6_dev unicast addr list. */ 604 ipv6_link_dev_addr(idev, ifa); 605 606 #ifdef CONFIG_IPV6_PRIVACY 607 if (ifa->flags&IFA_F_TEMPORARY) { 608 ifa->tmp_next = idev->tempaddr_list; 609 idev->tempaddr_list = ifa; 610 in6_ifa_hold(ifa); 611 } 612 #endif 613 614 in6_ifa_hold(ifa); 615 write_unlock(&idev->lock); 616 out2: 617 rcu_read_unlock_bh(); 618 619 if (likely(err == 0)) 620 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 621 else { 622 kfree(ifa); 623 ifa = ERR_PTR(err); 624 } 625 626 return ifa; 627 out: 628 write_unlock(&addrconf_hash_lock); 629 goto out2; 630 } 631 632 /* This function wants to get referenced ifp and releases it before return */ 633 634 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 635 { 636 struct inet6_ifaddr *ifa, **ifap; 637 struct inet6_dev *idev = ifp->idev; 638 int hash; 639 int deleted = 0, onlink = 0; 640 unsigned long expires = jiffies; 641 642 hash = ipv6_addr_hash(&ifp->addr); 643 644 ifp->dead = 1; 645 646 write_lock_bh(&addrconf_hash_lock); 647 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 648 ifap = &ifa->lst_next) { 649 if (ifa == ifp) { 650 *ifap = ifa->lst_next; 651 __in6_ifa_put(ifp); 652 ifa->lst_next = NULL; 653 break; 654 } 655 } 656 write_unlock_bh(&addrconf_hash_lock); 657 658 write_lock_bh(&idev->lock); 659 #ifdef CONFIG_IPV6_PRIVACY 660 if (ifp->flags&IFA_F_TEMPORARY) { 661 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 662 ifap = &ifa->tmp_next) { 663 if (ifa == ifp) { 664 *ifap = ifa->tmp_next; 665 if (ifp->ifpub) { 666 in6_ifa_put(ifp->ifpub); 667 ifp->ifpub = NULL; 668 } 669 __in6_ifa_put(ifp); 670 ifa->tmp_next = NULL; 671 break; 672 } 673 } 674 } 675 #endif 676 677 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 678 if (ifa == ifp) { 679 *ifap = ifa->if_next; 680 __in6_ifa_put(ifp); 681 ifa->if_next = NULL; 682 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 683 break; 684 deleted = 1; 685 continue; 686 } else if (ifp->flags & IFA_F_PERMANENT) { 687 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 688 ifp->prefix_len)) { 689 if (ifa->flags & IFA_F_PERMANENT) { 690 onlink = 1; 691 if (deleted) 692 break; 693 } else { 694 unsigned long lifetime; 695 696 if (!onlink) 697 onlink = -1; 698 699 spin_lock(&ifa->lock); 700 lifetime = min_t(unsigned long, 701 ifa->valid_lft, 0x7fffffffUL/HZ); 702 if (time_before(expires, 703 ifa->tstamp + lifetime * HZ)) 704 expires = ifa->tstamp + lifetime * HZ; 705 spin_unlock(&ifa->lock); 706 } 707 } 708 } 709 ifap = &ifa->if_next; 710 } 711 write_unlock_bh(&idev->lock); 712 713 ipv6_ifa_notify(RTM_DELADDR, ifp); 714 715 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 716 717 addrconf_del_timer(ifp); 718 719 /* 720 * Purge or update corresponding prefix 721 * 722 * 1) we don't purge prefix here if address was not permanent. 723 * prefix is managed by its own lifetime. 724 * 2) if there're no addresses, delete prefix. 725 * 3) if there're still other permanent address(es), 726 * corresponding prefix is still permanent. 727 * 4) otherwise, update prefix lifetime to the 728 * longest valid lifetime among the corresponding 729 * addresses on the device. 730 * Note: subsequent RA will update lifetime. 731 * 732 * --yoshfuji 733 */ 734 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 735 struct in6_addr prefix; 736 struct rt6_info *rt; 737 738 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 739 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 740 741 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 742 if (onlink == 0) { 743 ip6_del_rt(rt); 744 rt = NULL; 745 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 746 rt->rt6i_expires = expires; 747 rt->rt6i_flags |= RTF_EXPIRES; 748 } 749 } 750 dst_release(&rt->u.dst); 751 } 752 753 in6_ifa_put(ifp); 754 } 755 756 #ifdef CONFIG_IPV6_PRIVACY 757 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 758 { 759 struct inet6_dev *idev = ifp->idev; 760 struct in6_addr addr, *tmpaddr; 761 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 762 int tmp_plen; 763 int ret = 0; 764 int max_addresses; 765 766 write_lock(&idev->lock); 767 if (ift) { 768 spin_lock_bh(&ift->lock); 769 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 770 spin_unlock_bh(&ift->lock); 771 tmpaddr = &addr; 772 } else { 773 tmpaddr = NULL; 774 } 775 retry: 776 in6_dev_hold(idev); 777 if (idev->cnf.use_tempaddr <= 0) { 778 write_unlock(&idev->lock); 779 printk(KERN_INFO 780 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 781 in6_dev_put(idev); 782 ret = -1; 783 goto out; 784 } 785 spin_lock_bh(&ifp->lock); 786 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 787 idev->cnf.use_tempaddr = -1; /*XXX*/ 788 spin_unlock_bh(&ifp->lock); 789 write_unlock(&idev->lock); 790 printk(KERN_WARNING 791 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 792 in6_dev_put(idev); 793 ret = -1; 794 goto out; 795 } 796 in6_ifa_hold(ifp); 797 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 798 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 799 spin_unlock_bh(&ifp->lock); 800 write_unlock(&idev->lock); 801 printk(KERN_WARNING 802 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 803 in6_ifa_put(ifp); 804 in6_dev_put(idev); 805 ret = -1; 806 goto out; 807 } 808 memcpy(&addr.s6_addr[8], idev->rndid, 8); 809 tmp_valid_lft = min_t(__u32, 810 ifp->valid_lft, 811 idev->cnf.temp_valid_lft); 812 tmp_prefered_lft = min_t(__u32, 813 ifp->prefered_lft, 814 idev->cnf.temp_prefered_lft - desync_factor / HZ); 815 tmp_plen = ifp->prefix_len; 816 max_addresses = idev->cnf.max_addresses; 817 tmp_cstamp = ifp->cstamp; 818 tmp_tstamp = ifp->tstamp; 819 spin_unlock_bh(&ifp->lock); 820 821 write_unlock(&idev->lock); 822 ift = !max_addresses || 823 ipv6_count_addresses(idev) < max_addresses ? 824 ipv6_add_addr(idev, &addr, tmp_plen, 825 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL; 826 if (!ift || IS_ERR(ift)) { 827 in6_ifa_put(ifp); 828 in6_dev_put(idev); 829 printk(KERN_INFO 830 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 831 tmpaddr = &addr; 832 write_lock(&idev->lock); 833 goto retry; 834 } 835 836 spin_lock_bh(&ift->lock); 837 ift->ifpub = ifp; 838 ift->valid_lft = tmp_valid_lft; 839 ift->prefered_lft = tmp_prefered_lft; 840 ift->cstamp = tmp_cstamp; 841 ift->tstamp = tmp_tstamp; 842 spin_unlock_bh(&ift->lock); 843 844 addrconf_dad_start(ift, 0); 845 in6_ifa_put(ift); 846 in6_dev_put(idev); 847 out: 848 return ret; 849 } 850 #endif 851 852 /* 853 * Choose an appropriate source address (RFC3484) 854 */ 855 struct ipv6_saddr_score { 856 int addr_type; 857 unsigned int attrs; 858 int matchlen; 859 int scope; 860 unsigned int rule; 861 }; 862 863 #define IPV6_SADDR_SCORE_LOCAL 0x0001 864 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 865 #define IPV6_SADDR_SCORE_HOA 0x0008 866 #define IPV6_SADDR_SCORE_OIF 0x0010 867 #define IPV6_SADDR_SCORE_LABEL 0x0020 868 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 869 870 static int inline ipv6_saddr_preferred(int type) 871 { 872 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 873 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 874 return 1; 875 return 0; 876 } 877 878 /* static matching label */ 879 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type) 880 { 881 /* 882 * prefix (longest match) label 883 * ----------------------------- 884 * ::1/128 0 885 * ::/0 1 886 * 2002::/16 2 887 * ::/96 3 888 * ::ffff:0:0/96 4 889 * fc00::/7 5 890 * 2001::/32 6 891 */ 892 if (type & IPV6_ADDR_LOOPBACK) 893 return 0; 894 else if (type & IPV6_ADDR_COMPATv4) 895 return 3; 896 else if (type & IPV6_ADDR_MAPPED) 897 return 4; 898 else if (addr->s6_addr32[0] == htonl(0x20010000)) 899 return 6; 900 else if (addr->s6_addr16[0] == htons(0x2002)) 901 return 2; 902 else if ((addr->s6_addr[0] & 0xfe) == 0xfc) 903 return 5; 904 return 1; 905 } 906 907 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 908 struct in6_addr *daddr, struct in6_addr *saddr) 909 { 910 struct ipv6_saddr_score hiscore; 911 struct inet6_ifaddr *ifa_result = NULL; 912 int daddr_type = __ipv6_addr_type(daddr); 913 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 914 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type); 915 struct net_device *dev; 916 917 memset(&hiscore, 0, sizeof(hiscore)); 918 919 read_lock(&dev_base_lock); 920 rcu_read_lock(); 921 922 for (dev = dev_base; dev; dev=dev->next) { 923 struct inet6_dev *idev; 924 struct inet6_ifaddr *ifa; 925 926 /* Rule 0: Candidate Source Address (section 4) 927 * - multicast and link-local destination address, 928 * the set of candidate source address MUST only 929 * include addresses assigned to interfaces 930 * belonging to the same link as the outgoing 931 * interface. 932 * (- For site-local destination addresses, the 933 * set of candidate source addresses MUST only 934 * include addresses assigned to interfaces 935 * belonging to the same site as the outgoing 936 * interface.) 937 */ 938 if ((daddr_type & IPV6_ADDR_MULTICAST || 939 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 940 daddr_dev && dev != daddr_dev) 941 continue; 942 943 idev = __in6_dev_get(dev); 944 if (!idev) 945 continue; 946 947 read_lock_bh(&idev->lock); 948 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 949 struct ipv6_saddr_score score; 950 951 score.addr_type = __ipv6_addr_type(&ifa->addr); 952 953 /* Rule 0: 954 * - Tentative Address (RFC2462 section 5.4) 955 * - A tentative address is not considered 956 * "assigned to an interface" in the traditional 957 * sense. 958 * - Candidate Source Address (section 4) 959 * - In any case, anycast addresses, multicast 960 * addresses, and the unspecified address MUST 961 * NOT be included in a candidate set. 962 */ 963 if (ifa->flags & IFA_F_TENTATIVE) 964 continue; 965 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 966 score.addr_type & IPV6_ADDR_MULTICAST)) { 967 LIMIT_NETDEBUG(KERN_DEBUG 968 "ADDRCONF: unspecified / multicast address" 969 "assigned as unicast address on %s", 970 dev->name); 971 continue; 972 } 973 974 score.attrs = 0; 975 score.matchlen = 0; 976 score.scope = 0; 977 score.rule = 0; 978 979 if (ifa_result == NULL) { 980 /* record it if the first available entry */ 981 goto record_it; 982 } 983 984 /* Rule 1: Prefer same address */ 985 if (hiscore.rule < 1) { 986 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 987 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 988 hiscore.rule++; 989 } 990 if (ipv6_addr_equal(&ifa->addr, daddr)) { 991 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 992 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 993 score.rule = 1; 994 goto record_it; 995 } 996 } else { 997 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 998 continue; 999 } 1000 1001 /* Rule 2: Prefer appropriate scope */ 1002 if (hiscore.rule < 2) { 1003 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 1004 hiscore.rule++; 1005 } 1006 score.scope = __ipv6_addr_src_scope(score.addr_type); 1007 if (hiscore.scope < score.scope) { 1008 if (hiscore.scope < daddr_scope) { 1009 score.rule = 2; 1010 goto record_it; 1011 } else 1012 continue; 1013 } else if (score.scope < hiscore.scope) { 1014 if (score.scope < daddr_scope) 1015 break; /* addresses sorted by scope */ 1016 else { 1017 score.rule = 2; 1018 goto record_it; 1019 } 1020 } 1021 1022 /* Rule 3: Avoid deprecated address */ 1023 if (hiscore.rule < 3) { 1024 if (ipv6_saddr_preferred(hiscore.addr_type) || 1025 !(ifa_result->flags & IFA_F_DEPRECATED)) 1026 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1027 hiscore.rule++; 1028 } 1029 if (ipv6_saddr_preferred(score.addr_type) || 1030 !(ifa->flags & IFA_F_DEPRECATED)) { 1031 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1032 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 1033 score.rule = 3; 1034 goto record_it; 1035 } 1036 } else { 1037 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 1038 continue; 1039 } 1040 1041 /* Rule 4: Prefer home address -- not implemented yet */ 1042 if (hiscore.rule < 4) 1043 hiscore.rule++; 1044 1045 /* Rule 5: Prefer outgoing interface */ 1046 if (hiscore.rule < 5) { 1047 if (daddr_dev == NULL || 1048 daddr_dev == ifa_result->idev->dev) 1049 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1050 hiscore.rule++; 1051 } 1052 if (daddr_dev == NULL || 1053 daddr_dev == ifa->idev->dev) { 1054 score.attrs |= IPV6_SADDR_SCORE_OIF; 1055 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1056 score.rule = 5; 1057 goto record_it; 1058 } 1059 } else { 1060 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1061 continue; 1062 } 1063 1064 /* Rule 6: Prefer matching label */ 1065 if (hiscore.rule < 6) { 1066 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) 1067 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1068 hiscore.rule++; 1069 } 1070 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { 1071 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1072 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1073 score.rule = 6; 1074 goto record_it; 1075 } 1076 } else { 1077 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1078 continue; 1079 } 1080 1081 #ifdef CONFIG_IPV6_PRIVACY 1082 /* Rule 7: Prefer public address 1083 * Note: prefer temprary address if use_tempaddr >= 2 1084 */ 1085 if (hiscore.rule < 7) { 1086 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1087 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1088 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1089 hiscore.rule++; 1090 } 1091 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1092 (ifa->idev->cnf.use_tempaddr >= 2)) { 1093 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1094 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1095 score.rule = 7; 1096 goto record_it; 1097 } 1098 } else { 1099 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1100 continue; 1101 } 1102 #else 1103 if (hiscore.rule < 7) 1104 hiscore.rule++; 1105 #endif 1106 /* Rule 8: Use longest matching prefix */ 1107 if (hiscore.rule < 8) { 1108 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1109 hiscore.rule++; 1110 } 1111 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1112 if (score.matchlen > hiscore.matchlen) { 1113 score.rule = 8; 1114 goto record_it; 1115 } 1116 #if 0 1117 else if (score.matchlen < hiscore.matchlen) 1118 continue; 1119 #endif 1120 1121 /* Final Rule: choose first available one */ 1122 continue; 1123 record_it: 1124 if (ifa_result) 1125 in6_ifa_put(ifa_result); 1126 in6_ifa_hold(ifa); 1127 ifa_result = ifa; 1128 hiscore = score; 1129 } 1130 read_unlock_bh(&idev->lock); 1131 } 1132 rcu_read_unlock(); 1133 read_unlock(&dev_base_lock); 1134 1135 if (!ifa_result) 1136 return -EADDRNOTAVAIL; 1137 1138 ipv6_addr_copy(saddr, &ifa_result->addr); 1139 in6_ifa_put(ifa_result); 1140 return 0; 1141 } 1142 1143 1144 int ipv6_get_saddr(struct dst_entry *dst, 1145 struct in6_addr *daddr, struct in6_addr *saddr) 1146 { 1147 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr); 1148 } 1149 1150 1151 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr) 1152 { 1153 struct inet6_dev *idev; 1154 int err = -EADDRNOTAVAIL; 1155 1156 rcu_read_lock(); 1157 if ((idev = __in6_dev_get(dev)) != NULL) { 1158 struct inet6_ifaddr *ifp; 1159 1160 read_lock_bh(&idev->lock); 1161 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1162 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1163 ipv6_addr_copy(addr, &ifp->addr); 1164 err = 0; 1165 break; 1166 } 1167 } 1168 read_unlock_bh(&idev->lock); 1169 } 1170 rcu_read_unlock(); 1171 return err; 1172 } 1173 1174 static int ipv6_count_addresses(struct inet6_dev *idev) 1175 { 1176 int cnt = 0; 1177 struct inet6_ifaddr *ifp; 1178 1179 read_lock_bh(&idev->lock); 1180 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1181 cnt++; 1182 read_unlock_bh(&idev->lock); 1183 return cnt; 1184 } 1185 1186 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1187 { 1188 struct inet6_ifaddr * ifp; 1189 u8 hash = ipv6_addr_hash(addr); 1190 1191 read_lock_bh(&addrconf_hash_lock); 1192 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1193 if (ipv6_addr_equal(&ifp->addr, addr) && 1194 !(ifp->flags&IFA_F_TENTATIVE)) { 1195 if (dev == NULL || ifp->idev->dev == dev || 1196 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1197 break; 1198 } 1199 } 1200 read_unlock_bh(&addrconf_hash_lock); 1201 return ifp != NULL; 1202 } 1203 1204 static 1205 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1206 { 1207 struct inet6_ifaddr * ifp; 1208 u8 hash = ipv6_addr_hash(addr); 1209 1210 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1211 if (ipv6_addr_equal(&ifp->addr, addr)) { 1212 if (dev == NULL || ifp->idev->dev == dev) 1213 break; 1214 } 1215 } 1216 return ifp != NULL; 1217 } 1218 1219 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1220 { 1221 struct inet6_ifaddr * ifp; 1222 u8 hash = ipv6_addr_hash(addr); 1223 1224 read_lock_bh(&addrconf_hash_lock); 1225 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1226 if (ipv6_addr_equal(&ifp->addr, addr)) { 1227 if (dev == NULL || ifp->idev->dev == dev || 1228 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1229 in6_ifa_hold(ifp); 1230 break; 1231 } 1232 } 1233 } 1234 read_unlock_bh(&addrconf_hash_lock); 1235 1236 return ifp; 1237 } 1238 1239 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1240 { 1241 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1242 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1243 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1244 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1245 int sk_ipv6only = ipv6_only_sock(sk); 1246 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1247 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1248 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1249 1250 if (!sk2_rcv_saddr && !sk_ipv6only) 1251 return 1; 1252 1253 if (addr_type2 == IPV6_ADDR_ANY && 1254 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1255 return 1; 1256 1257 if (addr_type == IPV6_ADDR_ANY && 1258 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1259 return 1; 1260 1261 if (sk2_rcv_saddr6 && 1262 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1263 return 1; 1264 1265 if (addr_type == IPV6_ADDR_MAPPED && 1266 !sk2_ipv6only && 1267 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1268 return 1; 1269 1270 return 0; 1271 } 1272 1273 /* Gets referenced address, destroys ifaddr */ 1274 1275 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1276 { 1277 if (ifp->flags&IFA_F_PERMANENT) { 1278 spin_lock_bh(&ifp->lock); 1279 addrconf_del_timer(ifp); 1280 ifp->flags |= IFA_F_TENTATIVE; 1281 spin_unlock_bh(&ifp->lock); 1282 in6_ifa_put(ifp); 1283 #ifdef CONFIG_IPV6_PRIVACY 1284 } else if (ifp->flags&IFA_F_TEMPORARY) { 1285 struct inet6_ifaddr *ifpub; 1286 spin_lock_bh(&ifp->lock); 1287 ifpub = ifp->ifpub; 1288 if (ifpub) { 1289 in6_ifa_hold(ifpub); 1290 spin_unlock_bh(&ifp->lock); 1291 ipv6_create_tempaddr(ifpub, ifp); 1292 in6_ifa_put(ifpub); 1293 } else { 1294 spin_unlock_bh(&ifp->lock); 1295 } 1296 ipv6_del_addr(ifp); 1297 #endif 1298 } else 1299 ipv6_del_addr(ifp); 1300 } 1301 1302 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1303 { 1304 if (net_ratelimit()) 1305 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1306 addrconf_dad_stop(ifp); 1307 } 1308 1309 /* Join to solicited addr multicast group. */ 1310 1311 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1312 { 1313 struct in6_addr maddr; 1314 1315 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1316 return; 1317 1318 addrconf_addr_solict_mult(addr, &maddr); 1319 ipv6_dev_mc_inc(dev, &maddr); 1320 } 1321 1322 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1323 { 1324 struct in6_addr maddr; 1325 1326 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1327 return; 1328 1329 addrconf_addr_solict_mult(addr, &maddr); 1330 __ipv6_dev_mc_dec(idev, &maddr); 1331 } 1332 1333 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1334 { 1335 struct in6_addr addr; 1336 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1337 if (ipv6_addr_any(&addr)) 1338 return; 1339 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1340 } 1341 1342 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1343 { 1344 struct in6_addr addr; 1345 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1346 if (ipv6_addr_any(&addr)) 1347 return; 1348 __ipv6_dev_ac_dec(ifp->idev, &addr); 1349 } 1350 1351 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1352 { 1353 if (dev->addr_len != ETH_ALEN) 1354 return -1; 1355 memcpy(eui, dev->dev_addr, 3); 1356 memcpy(eui + 5, dev->dev_addr + 3, 3); 1357 1358 /* 1359 * The zSeries OSA network cards can be shared among various 1360 * OS instances, but the OSA cards have only one MAC address. 1361 * This leads to duplicate address conflicts in conjunction 1362 * with IPv6 if more than one instance uses the same card. 1363 * 1364 * The driver for these cards can deliver a unique 16-bit 1365 * identifier for each instance sharing the same card. It is 1366 * placed instead of 0xFFFE in the interface identifier. The 1367 * "u" bit of the interface identifier is not inverted in this 1368 * case. Hence the resulting interface identifier has local 1369 * scope according to RFC2373. 1370 */ 1371 if (dev->dev_id) { 1372 eui[3] = (dev->dev_id >> 8) & 0xFF; 1373 eui[4] = dev->dev_id & 0xFF; 1374 } else { 1375 eui[3] = 0xFF; 1376 eui[4] = 0xFE; 1377 eui[0] ^= 2; 1378 } 1379 return 0; 1380 } 1381 1382 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1383 { 1384 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1385 if (dev->addr_len != ARCNET_ALEN) 1386 return -1; 1387 memset(eui, 0, 7); 1388 eui[7] = *(u8*)dev->dev_addr; 1389 return 0; 1390 } 1391 1392 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1393 { 1394 if (dev->addr_len != INFINIBAND_ALEN) 1395 return -1; 1396 memcpy(eui, dev->dev_addr + 12, 8); 1397 eui[0] |= 2; 1398 return 0; 1399 } 1400 1401 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1402 { 1403 switch (dev->type) { 1404 case ARPHRD_ETHER: 1405 case ARPHRD_FDDI: 1406 case ARPHRD_IEEE802_TR: 1407 return addrconf_ifid_eui48(eui, dev); 1408 case ARPHRD_ARCNET: 1409 return addrconf_ifid_arcnet(eui, dev); 1410 case ARPHRD_INFINIBAND: 1411 return addrconf_ifid_infiniband(eui, dev); 1412 } 1413 return -1; 1414 } 1415 1416 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1417 { 1418 int err = -1; 1419 struct inet6_ifaddr *ifp; 1420 1421 read_lock_bh(&idev->lock); 1422 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1423 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1424 memcpy(eui, ifp->addr.s6_addr+8, 8); 1425 err = 0; 1426 break; 1427 } 1428 } 1429 read_unlock_bh(&idev->lock); 1430 return err; 1431 } 1432 1433 #ifdef CONFIG_IPV6_PRIVACY 1434 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1435 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1436 { 1437 regen: 1438 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1439 idev->rndid[0] &= ~0x02; 1440 1441 /* 1442 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1443 * check if generated address is not inappropriate 1444 * 1445 * - Reserved subnet anycast (RFC 2526) 1446 * 11111101 11....11 1xxxxxxx 1447 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 1448 * 00-00-5E-FE-xx-xx-xx-xx 1449 * - value 0 1450 * - XXX: already assigned to an address on the device 1451 */ 1452 if (idev->rndid[0] == 0xfd && 1453 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1454 (idev->rndid[7]&0x80)) 1455 goto regen; 1456 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1457 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1458 goto regen; 1459 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1460 goto regen; 1461 } 1462 1463 return 0; 1464 } 1465 1466 static void ipv6_regen_rndid(unsigned long data) 1467 { 1468 struct inet6_dev *idev = (struct inet6_dev *) data; 1469 unsigned long expires; 1470 1471 rcu_read_lock_bh(); 1472 write_lock_bh(&idev->lock); 1473 1474 if (idev->dead) 1475 goto out; 1476 1477 if (__ipv6_regen_rndid(idev) < 0) 1478 goto out; 1479 1480 expires = jiffies + 1481 idev->cnf.temp_prefered_lft * HZ - 1482 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1483 if (time_before(expires, jiffies)) { 1484 printk(KERN_WARNING 1485 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1486 idev->dev->name); 1487 goto out; 1488 } 1489 1490 if (!mod_timer(&idev->regen_timer, expires)) 1491 in6_dev_hold(idev); 1492 1493 out: 1494 write_unlock_bh(&idev->lock); 1495 rcu_read_unlock_bh(); 1496 in6_dev_put(idev); 1497 } 1498 1499 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1500 int ret = 0; 1501 1502 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1503 ret = __ipv6_regen_rndid(idev); 1504 return ret; 1505 } 1506 #endif 1507 1508 /* 1509 * Add prefix route. 1510 */ 1511 1512 static void 1513 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1514 unsigned long expires, u32 flags) 1515 { 1516 struct fib6_config cfg = { 1517 .fc_table = RT6_TABLE_PREFIX, 1518 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1519 .fc_ifindex = dev->ifindex, 1520 .fc_expires = expires, 1521 .fc_dst_len = plen, 1522 .fc_flags = RTF_UP | flags, 1523 }; 1524 1525 ipv6_addr_copy(&cfg.fc_dst, pfx); 1526 1527 /* Prevent useless cloning on PtP SIT. 1528 This thing is done here expecting that the whole 1529 class of non-broadcast devices need not cloning. 1530 */ 1531 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1532 cfg.fc_flags |= RTF_NONEXTHOP; 1533 1534 ip6_route_add(&cfg); 1535 } 1536 1537 /* Create "default" multicast route to the interface */ 1538 1539 static void addrconf_add_mroute(struct net_device *dev) 1540 { 1541 struct fib6_config cfg = { 1542 .fc_table = RT6_TABLE_LOCAL, 1543 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1544 .fc_ifindex = dev->ifindex, 1545 .fc_dst_len = 8, 1546 .fc_flags = RTF_UP, 1547 }; 1548 1549 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1550 1551 ip6_route_add(&cfg); 1552 } 1553 1554 static void sit_route_add(struct net_device *dev) 1555 { 1556 struct fib6_config cfg = { 1557 .fc_table = RT6_TABLE_MAIN, 1558 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1559 .fc_ifindex = dev->ifindex, 1560 .fc_dst_len = 96, 1561 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1562 }; 1563 1564 /* prefix length - 96 bits "::d.d.d.d" */ 1565 ip6_route_add(&cfg); 1566 } 1567 1568 static void addrconf_add_lroute(struct net_device *dev) 1569 { 1570 struct in6_addr addr; 1571 1572 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1573 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1574 } 1575 1576 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1577 { 1578 struct inet6_dev *idev; 1579 1580 ASSERT_RTNL(); 1581 1582 if ((idev = ipv6_find_idev(dev)) == NULL) 1583 return NULL; 1584 1585 /* Add default multicast route */ 1586 addrconf_add_mroute(dev); 1587 1588 /* Add link local route */ 1589 addrconf_add_lroute(dev); 1590 return idev; 1591 } 1592 1593 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1594 { 1595 struct prefix_info *pinfo; 1596 __u32 valid_lft; 1597 __u32 prefered_lft; 1598 int addr_type; 1599 unsigned long rt_expires; 1600 struct inet6_dev *in6_dev; 1601 1602 pinfo = (struct prefix_info *) opt; 1603 1604 if (len < sizeof(struct prefix_info)) { 1605 ADBG(("addrconf: prefix option too short\n")); 1606 return; 1607 } 1608 1609 /* 1610 * Validation checks ([ADDRCONF], page 19) 1611 */ 1612 1613 addr_type = ipv6_addr_type(&pinfo->prefix); 1614 1615 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1616 return; 1617 1618 valid_lft = ntohl(pinfo->valid); 1619 prefered_lft = ntohl(pinfo->prefered); 1620 1621 if (prefered_lft > valid_lft) { 1622 if (net_ratelimit()) 1623 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1624 return; 1625 } 1626 1627 in6_dev = in6_dev_get(dev); 1628 1629 if (in6_dev == NULL) { 1630 if (net_ratelimit()) 1631 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1632 return; 1633 } 1634 1635 /* 1636 * Two things going on here: 1637 * 1) Add routes for on-link prefixes 1638 * 2) Configure prefixes with the auto flag set 1639 */ 1640 1641 /* Avoid arithmetic overflow. Really, we could 1642 save rt_expires in seconds, likely valid_lft, 1643 but it would require division in fib gc, that it 1644 not good. 1645 */ 1646 if (valid_lft >= 0x7FFFFFFF/HZ) 1647 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1648 else 1649 rt_expires = valid_lft * HZ; 1650 1651 /* 1652 * We convert this (in jiffies) to clock_t later. 1653 * Avoid arithmetic overflow there as well. 1654 * Overflow can happen only if HZ < USER_HZ. 1655 */ 1656 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1657 rt_expires = 0x7FFFFFFF / USER_HZ; 1658 1659 if (pinfo->onlink) { 1660 struct rt6_info *rt; 1661 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1662 1663 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1664 if (rt->rt6i_flags&RTF_EXPIRES) { 1665 if (valid_lft == 0) { 1666 ip6_del_rt(rt); 1667 rt = NULL; 1668 } else { 1669 rt->rt6i_expires = jiffies + rt_expires; 1670 } 1671 } 1672 } else if (valid_lft) { 1673 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1674 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1675 } 1676 if (rt) 1677 dst_release(&rt->u.dst); 1678 } 1679 1680 /* Try to figure out our local address for this prefix */ 1681 1682 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1683 struct inet6_ifaddr * ifp; 1684 struct in6_addr addr; 1685 int create = 0, update_lft = 0; 1686 1687 if (pinfo->prefix_len == 64) { 1688 memcpy(&addr, &pinfo->prefix, 8); 1689 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1690 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1691 in6_dev_put(in6_dev); 1692 return; 1693 } 1694 goto ok; 1695 } 1696 if (net_ratelimit()) 1697 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1698 pinfo->prefix_len); 1699 in6_dev_put(in6_dev); 1700 return; 1701 1702 ok: 1703 1704 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1705 1706 if (ifp == NULL && valid_lft) { 1707 int max_addresses = in6_dev->cnf.max_addresses; 1708 1709 /* Do not allow to create too much of autoconfigured 1710 * addresses; this would be too easy way to crash kernel. 1711 */ 1712 if (!max_addresses || 1713 ipv6_count_addresses(in6_dev) < max_addresses) 1714 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1715 addr_type&IPV6_ADDR_SCOPE_MASK, 0); 1716 1717 if (!ifp || IS_ERR(ifp)) { 1718 in6_dev_put(in6_dev); 1719 return; 1720 } 1721 1722 update_lft = create = 1; 1723 ifp->cstamp = jiffies; 1724 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1725 } 1726 1727 if (ifp) { 1728 int flags; 1729 unsigned long now; 1730 #ifdef CONFIG_IPV6_PRIVACY 1731 struct inet6_ifaddr *ift; 1732 #endif 1733 u32 stored_lft; 1734 1735 /* update lifetime (RFC2462 5.5.3 e) */ 1736 spin_lock(&ifp->lock); 1737 now = jiffies; 1738 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1739 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1740 else 1741 stored_lft = 0; 1742 if (!update_lft && stored_lft) { 1743 if (valid_lft > MIN_VALID_LIFETIME || 1744 valid_lft > stored_lft) 1745 update_lft = 1; 1746 else if (stored_lft <= MIN_VALID_LIFETIME) { 1747 /* valid_lft <= stored_lft is always true */ 1748 /* XXX: IPsec */ 1749 update_lft = 0; 1750 } else { 1751 valid_lft = MIN_VALID_LIFETIME; 1752 if (valid_lft < prefered_lft) 1753 prefered_lft = valid_lft; 1754 update_lft = 1; 1755 } 1756 } 1757 1758 if (update_lft) { 1759 ifp->valid_lft = valid_lft; 1760 ifp->prefered_lft = prefered_lft; 1761 ifp->tstamp = now; 1762 flags = ifp->flags; 1763 ifp->flags &= ~IFA_F_DEPRECATED; 1764 spin_unlock(&ifp->lock); 1765 1766 if (!(flags&IFA_F_TENTATIVE)) 1767 ipv6_ifa_notify(0, ifp); 1768 } else 1769 spin_unlock(&ifp->lock); 1770 1771 #ifdef CONFIG_IPV6_PRIVACY 1772 read_lock_bh(&in6_dev->lock); 1773 /* update all temporary addresses in the list */ 1774 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1775 /* 1776 * When adjusting the lifetimes of an existing 1777 * temporary address, only lower the lifetimes. 1778 * Implementations must not increase the 1779 * lifetimes of an existing temporary address 1780 * when processing a Prefix Information Option. 1781 */ 1782 spin_lock(&ift->lock); 1783 flags = ift->flags; 1784 if (ift->valid_lft > valid_lft && 1785 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1786 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1787 if (ift->prefered_lft > prefered_lft && 1788 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1789 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1790 spin_unlock(&ift->lock); 1791 if (!(flags&IFA_F_TENTATIVE)) 1792 ipv6_ifa_notify(0, ift); 1793 } 1794 1795 if (create && in6_dev->cnf.use_tempaddr > 0) { 1796 /* 1797 * When a new public address is created as described in [ADDRCONF], 1798 * also create a new temporary address. 1799 */ 1800 read_unlock_bh(&in6_dev->lock); 1801 ipv6_create_tempaddr(ifp, NULL); 1802 } else { 1803 read_unlock_bh(&in6_dev->lock); 1804 } 1805 #endif 1806 in6_ifa_put(ifp); 1807 addrconf_verify(0); 1808 } 1809 } 1810 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1811 in6_dev_put(in6_dev); 1812 } 1813 1814 /* 1815 * Set destination address. 1816 * Special case for SIT interfaces where we create a new "virtual" 1817 * device. 1818 */ 1819 int addrconf_set_dstaddr(void __user *arg) 1820 { 1821 struct in6_ifreq ireq; 1822 struct net_device *dev; 1823 int err = -EINVAL; 1824 1825 rtnl_lock(); 1826 1827 err = -EFAULT; 1828 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1829 goto err_exit; 1830 1831 dev = __dev_get_by_index(ireq.ifr6_ifindex); 1832 1833 err = -ENODEV; 1834 if (dev == NULL) 1835 goto err_exit; 1836 1837 if (dev->type == ARPHRD_SIT) { 1838 struct ifreq ifr; 1839 mm_segment_t oldfs; 1840 struct ip_tunnel_parm p; 1841 1842 err = -EADDRNOTAVAIL; 1843 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1844 goto err_exit; 1845 1846 memset(&p, 0, sizeof(p)); 1847 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1848 p.iph.saddr = 0; 1849 p.iph.version = 4; 1850 p.iph.ihl = 5; 1851 p.iph.protocol = IPPROTO_IPV6; 1852 p.iph.ttl = 64; 1853 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1854 1855 oldfs = get_fs(); set_fs(KERNEL_DS); 1856 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1857 set_fs(oldfs); 1858 1859 if (err == 0) { 1860 err = -ENOBUFS; 1861 if ((dev = __dev_get_by_name(p.name)) == NULL) 1862 goto err_exit; 1863 err = dev_open(dev); 1864 } 1865 } 1866 1867 err_exit: 1868 rtnl_unlock(); 1869 return err; 1870 } 1871 1872 /* 1873 * Manual configuration of address on an interface 1874 */ 1875 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1876 __u32 prefered_lft, __u32 valid_lft) 1877 { 1878 struct inet6_ifaddr *ifp; 1879 struct inet6_dev *idev; 1880 struct net_device *dev; 1881 __u8 ifa_flags = 0; 1882 int scope; 1883 1884 ASSERT_RTNL(); 1885 1886 /* check the lifetime */ 1887 if (!valid_lft || prefered_lft > valid_lft) 1888 return -EINVAL; 1889 1890 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1891 return -ENODEV; 1892 1893 if ((idev = addrconf_add_dev(dev)) == NULL) 1894 return -ENOBUFS; 1895 1896 scope = ipv6_addr_scope(pfx); 1897 1898 if (valid_lft == INFINITY_LIFE_TIME) 1899 ifa_flags |= IFA_F_PERMANENT; 1900 else if (valid_lft >= 0x7FFFFFFF/HZ) 1901 valid_lft = 0x7FFFFFFF/HZ; 1902 1903 if (prefered_lft == 0) 1904 ifa_flags |= IFA_F_DEPRECATED; 1905 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1906 (prefered_lft != INFINITY_LIFE_TIME)) 1907 prefered_lft = 0x7FFFFFFF/HZ; 1908 1909 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1910 1911 if (!IS_ERR(ifp)) { 1912 spin_lock_bh(&ifp->lock); 1913 ifp->valid_lft = valid_lft; 1914 ifp->prefered_lft = prefered_lft; 1915 ifp->tstamp = jiffies; 1916 spin_unlock_bh(&ifp->lock); 1917 1918 addrconf_dad_start(ifp, 0); 1919 in6_ifa_put(ifp); 1920 addrconf_verify(0); 1921 return 0; 1922 } 1923 1924 return PTR_ERR(ifp); 1925 } 1926 1927 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1928 { 1929 struct inet6_ifaddr *ifp; 1930 struct inet6_dev *idev; 1931 struct net_device *dev; 1932 1933 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1934 return -ENODEV; 1935 1936 if ((idev = __in6_dev_get(dev)) == NULL) 1937 return -ENXIO; 1938 1939 read_lock_bh(&idev->lock); 1940 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1941 if (ifp->prefix_len == plen && 1942 ipv6_addr_equal(pfx, &ifp->addr)) { 1943 in6_ifa_hold(ifp); 1944 read_unlock_bh(&idev->lock); 1945 1946 ipv6_del_addr(ifp); 1947 1948 /* If the last address is deleted administratively, 1949 disable IPv6 on this interface. 1950 */ 1951 if (idev->addr_list == NULL) 1952 addrconf_ifdown(idev->dev, 1); 1953 return 0; 1954 } 1955 } 1956 read_unlock_bh(&idev->lock); 1957 return -EADDRNOTAVAIL; 1958 } 1959 1960 1961 int addrconf_add_ifaddr(void __user *arg) 1962 { 1963 struct in6_ifreq ireq; 1964 int err; 1965 1966 if (!capable(CAP_NET_ADMIN)) 1967 return -EPERM; 1968 1969 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1970 return -EFAULT; 1971 1972 rtnl_lock(); 1973 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 1974 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 1975 rtnl_unlock(); 1976 return err; 1977 } 1978 1979 int addrconf_del_ifaddr(void __user *arg) 1980 { 1981 struct in6_ifreq ireq; 1982 int err; 1983 1984 if (!capable(CAP_NET_ADMIN)) 1985 return -EPERM; 1986 1987 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1988 return -EFAULT; 1989 1990 rtnl_lock(); 1991 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 1992 rtnl_unlock(); 1993 return err; 1994 } 1995 1996 static void sit_add_v4_addrs(struct inet6_dev *idev) 1997 { 1998 struct inet6_ifaddr * ifp; 1999 struct in6_addr addr; 2000 struct net_device *dev; 2001 int scope; 2002 2003 ASSERT_RTNL(); 2004 2005 memset(&addr, 0, sizeof(struct in6_addr)); 2006 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2007 2008 if (idev->dev->flags&IFF_POINTOPOINT) { 2009 addr.s6_addr32[0] = htonl(0xfe800000); 2010 scope = IFA_LINK; 2011 } else { 2012 scope = IPV6_ADDR_COMPATv4; 2013 } 2014 2015 if (addr.s6_addr32[3]) { 2016 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2017 if (!IS_ERR(ifp)) { 2018 spin_lock_bh(&ifp->lock); 2019 ifp->flags &= ~IFA_F_TENTATIVE; 2020 spin_unlock_bh(&ifp->lock); 2021 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2022 in6_ifa_put(ifp); 2023 } 2024 return; 2025 } 2026 2027 for (dev = dev_base; dev != NULL; dev = dev->next) { 2028 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2029 if (in_dev && (dev->flags & IFF_UP)) { 2030 struct in_ifaddr * ifa; 2031 2032 int flag = scope; 2033 2034 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2035 int plen; 2036 2037 addr.s6_addr32[3] = ifa->ifa_local; 2038 2039 if (ifa->ifa_scope == RT_SCOPE_LINK) 2040 continue; 2041 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2042 if (idev->dev->flags&IFF_POINTOPOINT) 2043 continue; 2044 flag |= IFA_HOST; 2045 } 2046 if (idev->dev->flags&IFF_POINTOPOINT) 2047 plen = 64; 2048 else 2049 plen = 96; 2050 2051 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2052 IFA_F_PERMANENT); 2053 if (!IS_ERR(ifp)) { 2054 spin_lock_bh(&ifp->lock); 2055 ifp->flags &= ~IFA_F_TENTATIVE; 2056 spin_unlock_bh(&ifp->lock); 2057 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2058 in6_ifa_put(ifp); 2059 } 2060 } 2061 } 2062 } 2063 } 2064 2065 static void init_loopback(struct net_device *dev) 2066 { 2067 struct inet6_dev *idev; 2068 struct inet6_ifaddr * ifp; 2069 2070 /* ::1 */ 2071 2072 ASSERT_RTNL(); 2073 2074 if ((idev = ipv6_find_idev(dev)) == NULL) { 2075 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2076 return; 2077 } 2078 2079 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2080 if (!IS_ERR(ifp)) { 2081 spin_lock_bh(&ifp->lock); 2082 ifp->flags &= ~IFA_F_TENTATIVE; 2083 spin_unlock_bh(&ifp->lock); 2084 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2085 in6_ifa_put(ifp); 2086 } 2087 } 2088 2089 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2090 { 2091 struct inet6_ifaddr * ifp; 2092 2093 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT); 2094 if (!IS_ERR(ifp)) { 2095 addrconf_dad_start(ifp, 0); 2096 in6_ifa_put(ifp); 2097 } 2098 } 2099 2100 static void addrconf_dev_config(struct net_device *dev) 2101 { 2102 struct in6_addr addr; 2103 struct inet6_dev * idev; 2104 2105 ASSERT_RTNL(); 2106 2107 if ((dev->type != ARPHRD_ETHER) && 2108 (dev->type != ARPHRD_FDDI) && 2109 (dev->type != ARPHRD_IEEE802_TR) && 2110 (dev->type != ARPHRD_ARCNET) && 2111 (dev->type != ARPHRD_INFINIBAND)) { 2112 /* Alas, we support only Ethernet autoconfiguration. */ 2113 return; 2114 } 2115 2116 idev = addrconf_add_dev(dev); 2117 if (idev == NULL) 2118 return; 2119 2120 memset(&addr, 0, sizeof(struct in6_addr)); 2121 addr.s6_addr32[0] = htonl(0xFE800000); 2122 2123 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2124 addrconf_add_linklocal(idev, &addr); 2125 } 2126 2127 static void addrconf_sit_config(struct net_device *dev) 2128 { 2129 struct inet6_dev *idev; 2130 2131 ASSERT_RTNL(); 2132 2133 /* 2134 * Configure the tunnel with one of our IPv4 2135 * addresses... we should configure all of 2136 * our v4 addrs in the tunnel 2137 */ 2138 2139 if ((idev = ipv6_find_idev(dev)) == NULL) { 2140 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2141 return; 2142 } 2143 2144 sit_add_v4_addrs(idev); 2145 2146 if (dev->flags&IFF_POINTOPOINT) { 2147 addrconf_add_mroute(dev); 2148 addrconf_add_lroute(dev); 2149 } else 2150 sit_route_add(dev); 2151 } 2152 2153 static inline int 2154 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2155 { 2156 struct in6_addr lladdr; 2157 2158 if (!ipv6_get_lladdr(link_dev, &lladdr)) { 2159 addrconf_add_linklocal(idev, &lladdr); 2160 return 0; 2161 } 2162 return -1; 2163 } 2164 2165 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2166 { 2167 struct net_device *link_dev; 2168 2169 /* first try to inherit the link-local address from the link device */ 2170 if (idev->dev->iflink && 2171 (link_dev = __dev_get_by_index(idev->dev->iflink))) { 2172 if (!ipv6_inherit_linklocal(idev, link_dev)) 2173 return; 2174 } 2175 /* then try to inherit it from any device */ 2176 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) { 2177 if (!ipv6_inherit_linklocal(idev, link_dev)) 2178 return; 2179 } 2180 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2181 } 2182 2183 /* 2184 * Autoconfigure tunnel with a link-local address so routing protocols, 2185 * DHCPv6, MLD etc. can be run over the virtual link 2186 */ 2187 2188 static void addrconf_ip6_tnl_config(struct net_device *dev) 2189 { 2190 struct inet6_dev *idev; 2191 2192 ASSERT_RTNL(); 2193 2194 if ((idev = addrconf_add_dev(dev)) == NULL) { 2195 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2196 return; 2197 } 2198 ip6_tnl_add_linklocal(idev); 2199 } 2200 2201 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2202 void * data) 2203 { 2204 struct net_device *dev = (struct net_device *) data; 2205 struct inet6_dev *idev = __in6_dev_get(dev); 2206 int run_pending = 0; 2207 2208 switch(event) { 2209 case NETDEV_UP: 2210 case NETDEV_CHANGE: 2211 if (event == NETDEV_UP) { 2212 if (!netif_carrier_ok(dev)) { 2213 /* device is not ready yet. */ 2214 printk(KERN_INFO 2215 "ADDRCONF(NETDEV_UP): %s: " 2216 "link is not ready\n", 2217 dev->name); 2218 break; 2219 } 2220 2221 if (idev) 2222 idev->if_flags |= IF_READY; 2223 } else { 2224 if (!netif_carrier_ok(dev)) { 2225 /* device is still not ready. */ 2226 break; 2227 } 2228 2229 if (idev) { 2230 if (idev->if_flags & IF_READY) { 2231 /* device is already configured. */ 2232 break; 2233 } 2234 idev->if_flags |= IF_READY; 2235 } 2236 2237 printk(KERN_INFO 2238 "ADDRCONF(NETDEV_CHANGE): %s: " 2239 "link becomes ready\n", 2240 dev->name); 2241 2242 run_pending = 1; 2243 } 2244 2245 switch(dev->type) { 2246 case ARPHRD_SIT: 2247 addrconf_sit_config(dev); 2248 break; 2249 case ARPHRD_TUNNEL6: 2250 addrconf_ip6_tnl_config(dev); 2251 break; 2252 case ARPHRD_LOOPBACK: 2253 init_loopback(dev); 2254 break; 2255 2256 default: 2257 addrconf_dev_config(dev); 2258 break; 2259 }; 2260 if (idev) { 2261 if (run_pending) 2262 addrconf_dad_run(idev); 2263 2264 /* If the MTU changed during the interface down, when the 2265 interface up, the changed MTU must be reflected in the 2266 idev as well as routers. 2267 */ 2268 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2269 rt6_mtu_change(dev, dev->mtu); 2270 idev->cnf.mtu6 = dev->mtu; 2271 } 2272 idev->tstamp = jiffies; 2273 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2274 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2275 stop IPv6 on this interface. 2276 */ 2277 if (dev->mtu < IPV6_MIN_MTU) 2278 addrconf_ifdown(dev, event != NETDEV_DOWN); 2279 } 2280 break; 2281 2282 case NETDEV_CHANGEMTU: 2283 if ( idev && dev->mtu >= IPV6_MIN_MTU) { 2284 rt6_mtu_change(dev, dev->mtu); 2285 idev->cnf.mtu6 = dev->mtu; 2286 break; 2287 } 2288 2289 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2290 2291 case NETDEV_DOWN: 2292 case NETDEV_UNREGISTER: 2293 /* 2294 * Remove all addresses from this interface. 2295 */ 2296 addrconf_ifdown(dev, event != NETDEV_DOWN); 2297 break; 2298 2299 case NETDEV_CHANGENAME: 2300 #ifdef CONFIG_SYSCTL 2301 if (idev) { 2302 addrconf_sysctl_unregister(&idev->cnf); 2303 neigh_sysctl_unregister(idev->nd_parms); 2304 neigh_sysctl_register(dev, idev->nd_parms, 2305 NET_IPV6, NET_IPV6_NEIGH, "ipv6", 2306 &ndisc_ifinfo_sysctl_change, 2307 NULL); 2308 addrconf_sysctl_register(idev, &idev->cnf); 2309 } 2310 #endif 2311 break; 2312 }; 2313 2314 return NOTIFY_OK; 2315 } 2316 2317 /* 2318 * addrconf module should be notified of a device going up 2319 */ 2320 static struct notifier_block ipv6_dev_notf = { 2321 .notifier_call = addrconf_notify, 2322 .priority = 0 2323 }; 2324 2325 static int addrconf_ifdown(struct net_device *dev, int how) 2326 { 2327 struct inet6_dev *idev; 2328 struct inet6_ifaddr *ifa, **bifa; 2329 int i; 2330 2331 ASSERT_RTNL(); 2332 2333 if (dev == &loopback_dev && how == 1) 2334 how = 0; 2335 2336 rt6_ifdown(dev); 2337 neigh_ifdown(&nd_tbl, dev); 2338 2339 idev = __in6_dev_get(dev); 2340 if (idev == NULL) 2341 return -ENODEV; 2342 2343 /* Step 1: remove reference to ipv6 device from parent device. 2344 Do not dev_put! 2345 */ 2346 if (how == 1) { 2347 idev->dead = 1; 2348 2349 /* protected by rtnl_lock */ 2350 rcu_assign_pointer(dev->ip6_ptr, NULL); 2351 2352 /* Step 1.5: remove snmp6 entry */ 2353 snmp6_unregister_dev(idev); 2354 2355 } 2356 2357 /* Step 2: clear hash table */ 2358 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2359 bifa = &inet6_addr_lst[i]; 2360 2361 write_lock_bh(&addrconf_hash_lock); 2362 while ((ifa = *bifa) != NULL) { 2363 if (ifa->idev == idev) { 2364 *bifa = ifa->lst_next; 2365 ifa->lst_next = NULL; 2366 addrconf_del_timer(ifa); 2367 in6_ifa_put(ifa); 2368 continue; 2369 } 2370 bifa = &ifa->lst_next; 2371 } 2372 write_unlock_bh(&addrconf_hash_lock); 2373 } 2374 2375 write_lock_bh(&idev->lock); 2376 2377 /* Step 3: clear flags for stateless addrconf */ 2378 if (how != 1) 2379 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2380 2381 /* Step 4: clear address list */ 2382 #ifdef CONFIG_IPV6_PRIVACY 2383 if (how == 1 && del_timer(&idev->regen_timer)) 2384 in6_dev_put(idev); 2385 2386 /* clear tempaddr list */ 2387 while ((ifa = idev->tempaddr_list) != NULL) { 2388 idev->tempaddr_list = ifa->tmp_next; 2389 ifa->tmp_next = NULL; 2390 ifa->dead = 1; 2391 write_unlock_bh(&idev->lock); 2392 spin_lock_bh(&ifa->lock); 2393 2394 if (ifa->ifpub) { 2395 in6_ifa_put(ifa->ifpub); 2396 ifa->ifpub = NULL; 2397 } 2398 spin_unlock_bh(&ifa->lock); 2399 in6_ifa_put(ifa); 2400 write_lock_bh(&idev->lock); 2401 } 2402 #endif 2403 while ((ifa = idev->addr_list) != NULL) { 2404 idev->addr_list = ifa->if_next; 2405 ifa->if_next = NULL; 2406 ifa->dead = 1; 2407 addrconf_del_timer(ifa); 2408 write_unlock_bh(&idev->lock); 2409 2410 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2411 in6_ifa_put(ifa); 2412 2413 write_lock_bh(&idev->lock); 2414 } 2415 write_unlock_bh(&idev->lock); 2416 2417 /* Step 5: Discard multicast list */ 2418 2419 if (how == 1) 2420 ipv6_mc_destroy_dev(idev); 2421 else 2422 ipv6_mc_down(idev); 2423 2424 /* Step 5: netlink notification of this interface */ 2425 idev->tstamp = jiffies; 2426 inet6_ifinfo_notify(RTM_DELLINK, idev); 2427 2428 /* Shot the device (if unregistered) */ 2429 2430 if (how == 1) { 2431 #ifdef CONFIG_SYSCTL 2432 addrconf_sysctl_unregister(&idev->cnf); 2433 neigh_sysctl_unregister(idev->nd_parms); 2434 #endif 2435 neigh_parms_release(&nd_tbl, idev->nd_parms); 2436 neigh_ifdown(&nd_tbl, dev); 2437 in6_dev_put(idev); 2438 } 2439 return 0; 2440 } 2441 2442 static void addrconf_rs_timer(unsigned long data) 2443 { 2444 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2445 2446 if (ifp->idev->cnf.forwarding) 2447 goto out; 2448 2449 if (ifp->idev->if_flags & IF_RA_RCVD) { 2450 /* 2451 * Announcement received after solicitation 2452 * was sent 2453 */ 2454 goto out; 2455 } 2456 2457 spin_lock(&ifp->lock); 2458 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2459 struct in6_addr all_routers; 2460 2461 /* The wait after the last probe can be shorter */ 2462 addrconf_mod_timer(ifp, AC_RS, 2463 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2464 ifp->idev->cnf.rtr_solicit_delay : 2465 ifp->idev->cnf.rtr_solicit_interval); 2466 spin_unlock(&ifp->lock); 2467 2468 ipv6_addr_all_routers(&all_routers); 2469 2470 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2471 } else { 2472 spin_unlock(&ifp->lock); 2473 /* 2474 * Note: we do not support deprecated "all on-link" 2475 * assumption any longer. 2476 */ 2477 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2478 ifp->idev->dev->name); 2479 } 2480 2481 out: 2482 in6_ifa_put(ifp); 2483 } 2484 2485 /* 2486 * Duplicate Address Detection 2487 */ 2488 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2489 { 2490 unsigned long rand_num; 2491 struct inet6_dev *idev = ifp->idev; 2492 2493 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2494 ifp->probes = idev->cnf.dad_transmits; 2495 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2496 } 2497 2498 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2499 { 2500 struct inet6_dev *idev = ifp->idev; 2501 struct net_device *dev = idev->dev; 2502 2503 addrconf_join_solict(dev, &ifp->addr); 2504 2505 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT)) 2506 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0, 2507 flags); 2508 2509 net_srandom(ifp->addr.s6_addr32[3]); 2510 2511 read_lock_bh(&idev->lock); 2512 if (ifp->dead) 2513 goto out; 2514 spin_lock_bh(&ifp->lock); 2515 2516 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2517 !(ifp->flags&IFA_F_TENTATIVE)) { 2518 ifp->flags &= ~IFA_F_TENTATIVE; 2519 spin_unlock_bh(&ifp->lock); 2520 read_unlock_bh(&idev->lock); 2521 2522 addrconf_dad_completed(ifp); 2523 return; 2524 } 2525 2526 if (!(idev->if_flags & IF_READY)) { 2527 spin_unlock_bh(&ifp->lock); 2528 read_unlock_bh(&idev->lock); 2529 /* 2530 * If the defice is not ready: 2531 * - keep it tentative if it is a permanent address. 2532 * - otherwise, kill it. 2533 */ 2534 in6_ifa_hold(ifp); 2535 addrconf_dad_stop(ifp); 2536 return; 2537 } 2538 addrconf_dad_kick(ifp); 2539 spin_unlock_bh(&ifp->lock); 2540 out: 2541 read_unlock_bh(&idev->lock); 2542 } 2543 2544 static void addrconf_dad_timer(unsigned long data) 2545 { 2546 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2547 struct inet6_dev *idev = ifp->idev; 2548 struct in6_addr unspec; 2549 struct in6_addr mcaddr; 2550 2551 read_lock_bh(&idev->lock); 2552 if (idev->dead) { 2553 read_unlock_bh(&idev->lock); 2554 goto out; 2555 } 2556 spin_lock_bh(&ifp->lock); 2557 if (ifp->probes == 0) { 2558 /* 2559 * DAD was successful 2560 */ 2561 2562 ifp->flags &= ~IFA_F_TENTATIVE; 2563 spin_unlock_bh(&ifp->lock); 2564 read_unlock_bh(&idev->lock); 2565 2566 addrconf_dad_completed(ifp); 2567 2568 goto out; 2569 } 2570 2571 ifp->probes--; 2572 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2573 spin_unlock_bh(&ifp->lock); 2574 read_unlock_bh(&idev->lock); 2575 2576 /* send a neighbour solicitation for our addr */ 2577 memset(&unspec, 0, sizeof(unspec)); 2578 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2579 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2580 out: 2581 in6_ifa_put(ifp); 2582 } 2583 2584 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2585 { 2586 struct net_device * dev = ifp->idev->dev; 2587 2588 /* 2589 * Configure the address for reception. Now it is valid. 2590 */ 2591 2592 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2593 2594 /* If added prefix is link local and forwarding is off, 2595 start sending router solicitations. 2596 */ 2597 2598 if (ifp->idev->cnf.forwarding == 0 && 2599 ifp->idev->cnf.rtr_solicits > 0 && 2600 (dev->flags&IFF_LOOPBACK) == 0 && 2601 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2602 struct in6_addr all_routers; 2603 2604 ipv6_addr_all_routers(&all_routers); 2605 2606 /* 2607 * If a host as already performed a random delay 2608 * [...] as part of DAD [...] there is no need 2609 * to delay again before sending the first RS 2610 */ 2611 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2612 2613 spin_lock_bh(&ifp->lock); 2614 ifp->probes = 1; 2615 ifp->idev->if_flags |= IF_RS_SENT; 2616 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2617 spin_unlock_bh(&ifp->lock); 2618 } 2619 } 2620 2621 static void addrconf_dad_run(struct inet6_dev *idev) { 2622 struct inet6_ifaddr *ifp; 2623 2624 read_lock_bh(&idev->lock); 2625 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2626 spin_lock_bh(&ifp->lock); 2627 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2628 spin_unlock_bh(&ifp->lock); 2629 continue; 2630 } 2631 spin_unlock_bh(&ifp->lock); 2632 addrconf_dad_kick(ifp); 2633 } 2634 read_unlock_bh(&idev->lock); 2635 } 2636 2637 #ifdef CONFIG_PROC_FS 2638 struct if6_iter_state { 2639 int bucket; 2640 }; 2641 2642 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2643 { 2644 struct inet6_ifaddr *ifa = NULL; 2645 struct if6_iter_state *state = seq->private; 2646 2647 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2648 ifa = inet6_addr_lst[state->bucket]; 2649 if (ifa) 2650 break; 2651 } 2652 return ifa; 2653 } 2654 2655 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2656 { 2657 struct if6_iter_state *state = seq->private; 2658 2659 ifa = ifa->lst_next; 2660 try_again: 2661 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2662 ifa = inet6_addr_lst[state->bucket]; 2663 goto try_again; 2664 } 2665 return ifa; 2666 } 2667 2668 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2669 { 2670 struct inet6_ifaddr *ifa = if6_get_first(seq); 2671 2672 if (ifa) 2673 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2674 --pos; 2675 return pos ? NULL : ifa; 2676 } 2677 2678 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2679 { 2680 read_lock_bh(&addrconf_hash_lock); 2681 return if6_get_idx(seq, *pos); 2682 } 2683 2684 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2685 { 2686 struct inet6_ifaddr *ifa; 2687 2688 ifa = if6_get_next(seq, v); 2689 ++*pos; 2690 return ifa; 2691 } 2692 2693 static void if6_seq_stop(struct seq_file *seq, void *v) 2694 { 2695 read_unlock_bh(&addrconf_hash_lock); 2696 } 2697 2698 static int if6_seq_show(struct seq_file *seq, void *v) 2699 { 2700 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2701 seq_printf(seq, 2702 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2703 NIP6(ifp->addr), 2704 ifp->idev->dev->ifindex, 2705 ifp->prefix_len, 2706 ifp->scope, 2707 ifp->flags, 2708 ifp->idev->dev->name); 2709 return 0; 2710 } 2711 2712 static struct seq_operations if6_seq_ops = { 2713 .start = if6_seq_start, 2714 .next = if6_seq_next, 2715 .show = if6_seq_show, 2716 .stop = if6_seq_stop, 2717 }; 2718 2719 static int if6_seq_open(struct inode *inode, struct file *file) 2720 { 2721 struct seq_file *seq; 2722 int rc = -ENOMEM; 2723 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2724 2725 if (!s) 2726 goto out; 2727 2728 rc = seq_open(file, &if6_seq_ops); 2729 if (rc) 2730 goto out_kfree; 2731 2732 seq = file->private_data; 2733 seq->private = s; 2734 out: 2735 return rc; 2736 out_kfree: 2737 kfree(s); 2738 goto out; 2739 } 2740 2741 static struct file_operations if6_fops = { 2742 .owner = THIS_MODULE, 2743 .open = if6_seq_open, 2744 .read = seq_read, 2745 .llseek = seq_lseek, 2746 .release = seq_release_private, 2747 }; 2748 2749 int __init if6_proc_init(void) 2750 { 2751 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops)) 2752 return -ENOMEM; 2753 return 0; 2754 } 2755 2756 void if6_proc_exit(void) 2757 { 2758 proc_net_remove("if_inet6"); 2759 } 2760 #endif /* CONFIG_PROC_FS */ 2761 2762 /* 2763 * Periodic address status verification 2764 */ 2765 2766 static void addrconf_verify(unsigned long foo) 2767 { 2768 struct inet6_ifaddr *ifp; 2769 unsigned long now, next; 2770 int i; 2771 2772 spin_lock_bh(&addrconf_verify_lock); 2773 now = jiffies; 2774 next = now + ADDR_CHECK_FREQUENCY; 2775 2776 del_timer(&addr_chk_timer); 2777 2778 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2779 2780 restart: 2781 read_lock(&addrconf_hash_lock); 2782 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2783 unsigned long age; 2784 #ifdef CONFIG_IPV6_PRIVACY 2785 unsigned long regen_advance; 2786 #endif 2787 2788 if (ifp->flags & IFA_F_PERMANENT) 2789 continue; 2790 2791 spin_lock(&ifp->lock); 2792 age = (now - ifp->tstamp) / HZ; 2793 2794 #ifdef CONFIG_IPV6_PRIVACY 2795 regen_advance = ifp->idev->cnf.regen_max_retry * 2796 ifp->idev->cnf.dad_transmits * 2797 ifp->idev->nd_parms->retrans_time / HZ; 2798 #endif 2799 2800 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2801 age >= ifp->valid_lft) { 2802 spin_unlock(&ifp->lock); 2803 in6_ifa_hold(ifp); 2804 read_unlock(&addrconf_hash_lock); 2805 ipv6_del_addr(ifp); 2806 goto restart; 2807 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2808 spin_unlock(&ifp->lock); 2809 continue; 2810 } else if (age >= ifp->prefered_lft) { 2811 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2812 int deprecate = 0; 2813 2814 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2815 deprecate = 1; 2816 ifp->flags |= IFA_F_DEPRECATED; 2817 } 2818 2819 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2820 next = ifp->tstamp + ifp->valid_lft * HZ; 2821 2822 spin_unlock(&ifp->lock); 2823 2824 if (deprecate) { 2825 in6_ifa_hold(ifp); 2826 read_unlock(&addrconf_hash_lock); 2827 2828 ipv6_ifa_notify(0, ifp); 2829 in6_ifa_put(ifp); 2830 goto restart; 2831 } 2832 #ifdef CONFIG_IPV6_PRIVACY 2833 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2834 !(ifp->flags&IFA_F_TENTATIVE)) { 2835 if (age >= ifp->prefered_lft - regen_advance) { 2836 struct inet6_ifaddr *ifpub = ifp->ifpub; 2837 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2838 next = ifp->tstamp + ifp->prefered_lft * HZ; 2839 if (!ifp->regen_count && ifpub) { 2840 ifp->regen_count++; 2841 in6_ifa_hold(ifp); 2842 in6_ifa_hold(ifpub); 2843 spin_unlock(&ifp->lock); 2844 read_unlock(&addrconf_hash_lock); 2845 spin_lock(&ifpub->lock); 2846 ifpub->regen_count = 0; 2847 spin_unlock(&ifpub->lock); 2848 ipv6_create_tempaddr(ifpub, ifp); 2849 in6_ifa_put(ifpub); 2850 in6_ifa_put(ifp); 2851 goto restart; 2852 } 2853 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2854 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2855 spin_unlock(&ifp->lock); 2856 #endif 2857 } else { 2858 /* ifp->prefered_lft <= ifp->valid_lft */ 2859 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2860 next = ifp->tstamp + ifp->prefered_lft * HZ; 2861 spin_unlock(&ifp->lock); 2862 } 2863 } 2864 read_unlock(&addrconf_hash_lock); 2865 } 2866 2867 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2868 add_timer(&addr_chk_timer); 2869 spin_unlock_bh(&addrconf_verify_lock); 2870 } 2871 2872 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 2873 { 2874 struct in6_addr *pfx = NULL; 2875 2876 if (addr) 2877 pfx = nla_data(addr); 2878 2879 if (local) { 2880 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 2881 pfx = NULL; 2882 else 2883 pfx = nla_data(local); 2884 } 2885 2886 return pfx; 2887 } 2888 2889 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = { 2890 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 2891 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 2892 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 2893 }; 2894 2895 static int 2896 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2897 { 2898 struct ifaddrmsg *ifm; 2899 struct nlattr *tb[IFA_MAX+1]; 2900 struct in6_addr *pfx; 2901 int err; 2902 2903 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 2904 if (err < 0) 2905 return err; 2906 2907 ifm = nlmsg_data(nlh); 2908 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 2909 if (pfx == NULL) 2910 return -EINVAL; 2911 2912 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 2913 } 2914 2915 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 prefered_lft, 2916 u32 valid_lft) 2917 { 2918 int ifa_flags = 0; 2919 2920 if (!valid_lft || (prefered_lft > valid_lft)) 2921 return -EINVAL; 2922 2923 if (valid_lft == INFINITY_LIFE_TIME) 2924 ifa_flags = IFA_F_PERMANENT; 2925 else if (valid_lft >= 0x7FFFFFFF/HZ) 2926 valid_lft = 0x7FFFFFFF/HZ; 2927 2928 if (prefered_lft == 0) 2929 ifa_flags = IFA_F_DEPRECATED; 2930 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 2931 (prefered_lft != INFINITY_LIFE_TIME)) 2932 prefered_lft = 0x7FFFFFFF/HZ; 2933 2934 spin_lock_bh(&ifp->lock); 2935 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED|IFA_F_PERMANENT)) | ifa_flags; 2936 2937 ifp->tstamp = jiffies; 2938 ifp->valid_lft = valid_lft; 2939 ifp->prefered_lft = prefered_lft; 2940 2941 spin_unlock_bh(&ifp->lock); 2942 if (!(ifp->flags&IFA_F_TENTATIVE)) 2943 ipv6_ifa_notify(0, ifp); 2944 2945 addrconf_verify(0); 2946 2947 return 0; 2948 } 2949 2950 static int 2951 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2952 { 2953 struct ifaddrmsg *ifm; 2954 struct nlattr *tb[IFA_MAX+1]; 2955 struct in6_addr *pfx; 2956 struct inet6_ifaddr *ifa; 2957 struct net_device *dev; 2958 u32 valid_lft, preferred_lft; 2959 int err; 2960 2961 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 2962 if (err < 0) 2963 return err; 2964 2965 ifm = nlmsg_data(nlh); 2966 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 2967 if (pfx == NULL) 2968 return -EINVAL; 2969 2970 if (tb[IFA_CACHEINFO]) { 2971 struct ifa_cacheinfo *ci; 2972 2973 ci = nla_data(tb[IFA_CACHEINFO]); 2974 valid_lft = ci->ifa_valid; 2975 preferred_lft = ci->ifa_prefered; 2976 } else { 2977 preferred_lft = INFINITY_LIFE_TIME; 2978 valid_lft = INFINITY_LIFE_TIME; 2979 } 2980 2981 dev = __dev_get_by_index(ifm->ifa_index); 2982 if (dev == NULL) 2983 return -ENODEV; 2984 2985 ifa = ipv6_get_ifaddr(pfx, dev, 1); 2986 if (ifa == NULL) { 2987 /* 2988 * It would be best to check for !NLM_F_CREATE here but 2989 * userspace alreay relies on not having to provide this. 2990 */ 2991 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 2992 preferred_lft, valid_lft); 2993 } 2994 2995 if (nlh->nlmsg_flags & NLM_F_EXCL || 2996 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 2997 err = -EEXIST; 2998 else 2999 err = inet6_addr_modify(ifa, preferred_lft, valid_lft); 3000 3001 in6_ifa_put(ifa); 3002 3003 return err; 3004 } 3005 3006 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3007 u8 scope, int ifindex) 3008 { 3009 struct ifaddrmsg *ifm; 3010 3011 ifm = nlmsg_data(nlh); 3012 ifm->ifa_family = AF_INET6; 3013 ifm->ifa_prefixlen = prefixlen; 3014 ifm->ifa_flags = flags; 3015 ifm->ifa_scope = scope; 3016 ifm->ifa_index = ifindex; 3017 } 3018 3019 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3020 unsigned long tstamp, u32 preferred, u32 valid) 3021 { 3022 struct ifa_cacheinfo ci; 3023 3024 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100 3025 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3026 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100 3027 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3028 ci.ifa_prefered = preferred; 3029 ci.ifa_valid = valid; 3030 3031 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3032 } 3033 3034 static inline int rt_scope(int ifa_scope) 3035 { 3036 if (ifa_scope & IFA_HOST) 3037 return RT_SCOPE_HOST; 3038 else if (ifa_scope & IFA_LINK) 3039 return RT_SCOPE_LINK; 3040 else if (ifa_scope & IFA_SITE) 3041 return RT_SCOPE_SITE; 3042 else 3043 return RT_SCOPE_UNIVERSE; 3044 } 3045 3046 static inline int inet6_ifaddr_msgsize(void) 3047 { 3048 return nlmsg_total_size(sizeof(struct ifaddrmsg) + 3049 nla_total_size(16) + 3050 nla_total_size(sizeof(struct ifa_cacheinfo)) + 3051 128); 3052 } 3053 3054 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3055 u32 pid, u32 seq, int event, unsigned int flags) 3056 { 3057 struct nlmsghdr *nlh; 3058 u32 preferred, valid; 3059 3060 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3061 if (nlh == NULL) 3062 return -ENOBUFS; 3063 3064 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3065 ifa->idev->dev->ifindex); 3066 3067 if (!(ifa->flags&IFA_F_PERMANENT)) { 3068 preferred = ifa->prefered_lft; 3069 valid = ifa->valid_lft; 3070 if (preferred != INFINITY_LIFE_TIME) { 3071 long tval = (jiffies - ifa->tstamp)/HZ; 3072 preferred -= tval; 3073 if (valid != INFINITY_LIFE_TIME) 3074 valid -= tval; 3075 } 3076 } else { 3077 preferred = INFINITY_LIFE_TIME; 3078 valid = INFINITY_LIFE_TIME; 3079 } 3080 3081 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3082 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3083 return nlmsg_cancel(skb, nlh); 3084 3085 return nlmsg_end(skb, nlh); 3086 } 3087 3088 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3089 u32 pid, u32 seq, int event, u16 flags) 3090 { 3091 struct nlmsghdr *nlh; 3092 u8 scope = RT_SCOPE_UNIVERSE; 3093 int ifindex = ifmca->idev->dev->ifindex; 3094 3095 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3096 scope = RT_SCOPE_SITE; 3097 3098 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3099 if (nlh == NULL) 3100 return -ENOBUFS; 3101 3102 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3103 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3104 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3105 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) 3106 return nlmsg_cancel(skb, nlh); 3107 3108 return nlmsg_end(skb, nlh); 3109 } 3110 3111 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3112 u32 pid, u32 seq, int event, unsigned int flags) 3113 { 3114 struct nlmsghdr *nlh; 3115 u8 scope = RT_SCOPE_UNIVERSE; 3116 int ifindex = ifaca->aca_idev->dev->ifindex; 3117 3118 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3119 scope = RT_SCOPE_SITE; 3120 3121 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3122 if (nlh == NULL) 3123 return -ENOBUFS; 3124 3125 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3126 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3127 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3128 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) 3129 return nlmsg_cancel(skb, nlh); 3130 3131 return nlmsg_end(skb, nlh); 3132 } 3133 3134 enum addr_type_t 3135 { 3136 UNICAST_ADDR, 3137 MULTICAST_ADDR, 3138 ANYCAST_ADDR, 3139 }; 3140 3141 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3142 enum addr_type_t type) 3143 { 3144 int idx, ip_idx; 3145 int s_idx, s_ip_idx; 3146 int err = 1; 3147 struct net_device *dev; 3148 struct inet6_dev *idev = NULL; 3149 struct inet6_ifaddr *ifa; 3150 struct ifmcaddr6 *ifmca; 3151 struct ifacaddr6 *ifaca; 3152 3153 s_idx = cb->args[0]; 3154 s_ip_idx = ip_idx = cb->args[1]; 3155 read_lock(&dev_base_lock); 3156 3157 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { 3158 if (idx < s_idx) 3159 continue; 3160 if (idx > s_idx) 3161 s_ip_idx = 0; 3162 ip_idx = 0; 3163 if ((idev = in6_dev_get(dev)) == NULL) 3164 continue; 3165 read_lock_bh(&idev->lock); 3166 switch (type) { 3167 case UNICAST_ADDR: 3168 /* unicast address incl. temp addr */ 3169 for (ifa = idev->addr_list; ifa; 3170 ifa = ifa->if_next, ip_idx++) { 3171 if (ip_idx < s_ip_idx) 3172 continue; 3173 if ((err = inet6_fill_ifaddr(skb, ifa, 3174 NETLINK_CB(cb->skb).pid, 3175 cb->nlh->nlmsg_seq, RTM_NEWADDR, 3176 NLM_F_MULTI)) <= 0) 3177 goto done; 3178 } 3179 break; 3180 case MULTICAST_ADDR: 3181 /* multicast address */ 3182 for (ifmca = idev->mc_list; ifmca; 3183 ifmca = ifmca->next, ip_idx++) { 3184 if (ip_idx < s_ip_idx) 3185 continue; 3186 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 3187 NETLINK_CB(cb->skb).pid, 3188 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 3189 NLM_F_MULTI)) <= 0) 3190 goto done; 3191 } 3192 break; 3193 case ANYCAST_ADDR: 3194 /* anycast address */ 3195 for (ifaca = idev->ac_list; ifaca; 3196 ifaca = ifaca->aca_next, ip_idx++) { 3197 if (ip_idx < s_ip_idx) 3198 continue; 3199 if ((err = inet6_fill_ifacaddr(skb, ifaca, 3200 NETLINK_CB(cb->skb).pid, 3201 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 3202 NLM_F_MULTI)) <= 0) 3203 goto done; 3204 } 3205 break; 3206 default: 3207 break; 3208 } 3209 read_unlock_bh(&idev->lock); 3210 in6_dev_put(idev); 3211 } 3212 done: 3213 if (err <= 0) { 3214 read_unlock_bh(&idev->lock); 3215 in6_dev_put(idev); 3216 } 3217 read_unlock(&dev_base_lock); 3218 cb->args[0] = idx; 3219 cb->args[1] = ip_idx; 3220 return skb->len; 3221 } 3222 3223 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3224 { 3225 enum addr_type_t type = UNICAST_ADDR; 3226 return inet6_dump_addr(skb, cb, type); 3227 } 3228 3229 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3230 { 3231 enum addr_type_t type = MULTICAST_ADDR; 3232 return inet6_dump_addr(skb, cb, type); 3233 } 3234 3235 3236 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3237 { 3238 enum addr_type_t type = ANYCAST_ADDR; 3239 return inet6_dump_addr(skb, cb, type); 3240 } 3241 3242 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3243 void *arg) 3244 { 3245 struct ifaddrmsg *ifm; 3246 struct nlattr *tb[IFA_MAX+1]; 3247 struct in6_addr *addr = NULL; 3248 struct net_device *dev = NULL; 3249 struct inet6_ifaddr *ifa; 3250 struct sk_buff *skb; 3251 int err; 3252 3253 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3254 if (err < 0) 3255 goto errout; 3256 3257 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3258 if (addr == NULL) { 3259 err = -EINVAL; 3260 goto errout; 3261 } 3262 3263 ifm = nlmsg_data(nlh); 3264 if (ifm->ifa_index) 3265 dev = __dev_get_by_index(ifm->ifa_index); 3266 3267 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) { 3268 err = -EADDRNOTAVAIL; 3269 goto errout; 3270 } 3271 3272 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) { 3273 err = -ENOBUFS; 3274 goto errout_ifa; 3275 } 3276 3277 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3278 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3279 if (err < 0) { 3280 kfree_skb(skb); 3281 goto errout_ifa; 3282 } 3283 3284 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); 3285 errout_ifa: 3286 in6_ifa_put(ifa); 3287 errout: 3288 return err; 3289 } 3290 3291 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3292 { 3293 struct sk_buff *skb; 3294 int err = -ENOBUFS; 3295 3296 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3297 if (skb == NULL) 3298 goto errout; 3299 3300 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3301 if (err < 0) { 3302 kfree_skb(skb); 3303 goto errout; 3304 } 3305 3306 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3307 errout: 3308 if (err < 0) 3309 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3310 } 3311 3312 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf, 3313 __s32 *array, int bytes) 3314 { 3315 memset(array, 0, bytes); 3316 array[DEVCONF_FORWARDING] = cnf->forwarding; 3317 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3318 array[DEVCONF_MTU6] = cnf->mtu6; 3319 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3320 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3321 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3322 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3323 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3324 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3325 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3326 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3327 #ifdef CONFIG_IPV6_PRIVACY 3328 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3329 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3330 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3331 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3332 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3333 #endif 3334 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3335 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3336 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3337 #ifdef CONFIG_IPV6_ROUTER_PREF 3338 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3339 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3340 #ifdef CONFIV_IPV6_ROUTE_INFO 3341 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3342 #endif 3343 #endif 3344 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3345 } 3346 3347 /* Maximum length of ifinfomsg attributes */ 3348 #define INET6_IFINFO_RTA_SPACE \ 3349 RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \ 3350 RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \ 3351 RTA_SPACE(sizeof(u32)) /* MTU */ + \ 3352 RTA_SPACE(sizeof(int)) /* LINK */ + \ 3353 RTA_SPACE(0) /* PROTINFO */ + \ 3354 RTA_SPACE(sizeof(u32)) /* FLAGS */ + \ 3355 RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \ 3356 RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */ 3357 3358 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3359 u32 pid, u32 seq, int event, unsigned int flags) 3360 { 3361 struct net_device *dev = idev->dev; 3362 __s32 *array = NULL; 3363 struct ifinfomsg *r; 3364 struct nlmsghdr *nlh; 3365 unsigned char *b = skb->tail; 3366 struct rtattr *subattr; 3367 __u32 mtu = dev->mtu; 3368 struct ifla_cacheinfo ci; 3369 3370 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); 3371 r = NLMSG_DATA(nlh); 3372 r->ifi_family = AF_INET6; 3373 r->__ifi_pad = 0; 3374 r->ifi_type = dev->type; 3375 r->ifi_index = dev->ifindex; 3376 r->ifi_flags = dev_get_flags(dev); 3377 r->ifi_change = 0; 3378 3379 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); 3380 3381 if (dev->addr_len) 3382 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3383 3384 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); 3385 if (dev->ifindex != dev->iflink) 3386 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink); 3387 3388 subattr = (struct rtattr*)skb->tail; 3389 3390 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL); 3391 3392 /* return the device flags */ 3393 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags); 3394 3395 /* return interface cacheinfo */ 3396 ci.max_reasm_len = IPV6_MAXPLEN; 3397 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3398 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3399 ci.reachable_time = idev->nd_parms->reachable_time; 3400 ci.retrans_time = idev->nd_parms->retrans_time; 3401 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3402 3403 /* return the device sysctl params */ 3404 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL) 3405 goto rtattr_failure; 3406 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array)); 3407 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array); 3408 3409 /* XXX - Statistics/MC not implemented */ 3410 subattr->rta_len = skb->tail - (u8*)subattr; 3411 3412 nlh->nlmsg_len = skb->tail - b; 3413 kfree(array); 3414 return skb->len; 3415 3416 nlmsg_failure: 3417 rtattr_failure: 3418 kfree(array); 3419 skb_trim(skb, b - skb->data); 3420 return -1; 3421 } 3422 3423 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3424 { 3425 int idx, err; 3426 int s_idx = cb->args[0]; 3427 struct net_device *dev; 3428 struct inet6_dev *idev; 3429 3430 read_lock(&dev_base_lock); 3431 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { 3432 if (idx < s_idx) 3433 continue; 3434 if ((idev = in6_dev_get(dev)) == NULL) 3435 continue; 3436 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3437 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3438 in6_dev_put(idev); 3439 if (err <= 0) 3440 break; 3441 } 3442 read_unlock(&dev_base_lock); 3443 cb->args[0] = idx; 3444 3445 return skb->len; 3446 } 3447 3448 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3449 { 3450 struct sk_buff *skb; 3451 int payload = sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE; 3452 int err = -ENOBUFS; 3453 3454 skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC); 3455 if (skb == NULL) 3456 goto errout; 3457 3458 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 3459 if (err < 0) { 3460 kfree_skb(skb); 3461 goto errout; 3462 } 3463 3464 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3465 errout: 3466 if (err < 0) 3467 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err); 3468 } 3469 3470 /* Maximum length of prefix_cacheinfo attributes */ 3471 #define INET6_PREFIX_RTA_SPACE \ 3472 RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \ 3473 RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */ 3474 3475 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3476 struct prefix_info *pinfo, u32 pid, u32 seq, 3477 int event, unsigned int flags) 3478 { 3479 struct prefixmsg *pmsg; 3480 struct nlmsghdr *nlh; 3481 unsigned char *b = skb->tail; 3482 struct prefix_cacheinfo ci; 3483 3484 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags); 3485 pmsg = NLMSG_DATA(nlh); 3486 pmsg->prefix_family = AF_INET6; 3487 pmsg->prefix_pad1 = 0; 3488 pmsg->prefix_pad2 = 0; 3489 pmsg->prefix_ifindex = idev->dev->ifindex; 3490 pmsg->prefix_len = pinfo->prefix_len; 3491 pmsg->prefix_type = pinfo->type; 3492 pmsg->prefix_pad3 = 0; 3493 3494 pmsg->prefix_flags = 0; 3495 if (pinfo->onlink) 3496 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3497 if (pinfo->autoconf) 3498 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3499 3500 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3501 3502 ci.preferred_time = ntohl(pinfo->prefered); 3503 ci.valid_time = ntohl(pinfo->valid); 3504 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3505 3506 nlh->nlmsg_len = skb->tail - b; 3507 return skb->len; 3508 3509 nlmsg_failure: 3510 rtattr_failure: 3511 skb_trim(skb, b - skb->data); 3512 return -1; 3513 } 3514 3515 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3516 struct prefix_info *pinfo) 3517 { 3518 struct sk_buff *skb; 3519 int payload = sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE; 3520 int err = -ENOBUFS; 3521 3522 skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC); 3523 if (skb == NULL) 3524 goto errout; 3525 3526 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 3527 if (err < 0) { 3528 kfree_skb(skb); 3529 goto errout; 3530 } 3531 3532 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 3533 errout: 3534 if (err < 0) 3535 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err); 3536 } 3537 3538 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = { 3539 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, }, 3540 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, }, 3541 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, }, 3542 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr, 3543 .dumpit = inet6_dump_ifaddr, }, 3544 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, }, 3545 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, }, 3546 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, }, 3547 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, }, 3548 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute, 3549 .dumpit = inet6_dump_fib, }, 3550 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3551 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, }, 3552 #endif 3553 }; 3554 3555 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3556 { 3557 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3558 3559 switch (event) { 3560 case RTM_NEWADDR: 3561 ip6_ins_rt(ifp->rt); 3562 if (ifp->idev->cnf.forwarding) 3563 addrconf_join_anycast(ifp); 3564 break; 3565 case RTM_DELADDR: 3566 if (ifp->idev->cnf.forwarding) 3567 addrconf_leave_anycast(ifp); 3568 addrconf_leave_solict(ifp->idev, &ifp->addr); 3569 dst_hold(&ifp->rt->u.dst); 3570 if (ip6_del_rt(ifp->rt)) 3571 dst_free(&ifp->rt->u.dst); 3572 break; 3573 } 3574 } 3575 3576 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3577 { 3578 rcu_read_lock_bh(); 3579 if (likely(ifp->idev->dead == 0)) 3580 __ipv6_ifa_notify(event, ifp); 3581 rcu_read_unlock_bh(); 3582 } 3583 3584 #ifdef CONFIG_SYSCTL 3585 3586 static 3587 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3588 void __user *buffer, size_t *lenp, loff_t *ppos) 3589 { 3590 int *valp = ctl->data; 3591 int val = *valp; 3592 int ret; 3593 3594 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3595 3596 if (write && valp != &ipv6_devconf_dflt.forwarding) { 3597 if (valp != &ipv6_devconf.forwarding) { 3598 if ((!*valp) ^ (!val)) { 3599 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 3600 if (idev == NULL) 3601 return ret; 3602 dev_forward_change(idev); 3603 } 3604 } else { 3605 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; 3606 addrconf_forward_change(); 3607 } 3608 if (*valp) 3609 rt6_purge_dflt_routers(); 3610 } 3611 3612 return ret; 3613 } 3614 3615 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3616 int __user *name, int nlen, 3617 void __user *oldval, 3618 size_t __user *oldlenp, 3619 void __user *newval, size_t newlen, 3620 void **context) 3621 { 3622 int *valp = table->data; 3623 int new; 3624 3625 if (!newval || !newlen) 3626 return 0; 3627 if (newlen != sizeof(int)) 3628 return -EINVAL; 3629 if (get_user(new, (int __user *)newval)) 3630 return -EFAULT; 3631 if (new == *valp) 3632 return 0; 3633 if (oldval && oldlenp) { 3634 size_t len; 3635 if (get_user(len, oldlenp)) 3636 return -EFAULT; 3637 if (len) { 3638 if (len > table->maxlen) 3639 len = table->maxlen; 3640 if (copy_to_user(oldval, valp, len)) 3641 return -EFAULT; 3642 if (put_user(len, oldlenp)) 3643 return -EFAULT; 3644 } 3645 } 3646 3647 if (valp != &ipv6_devconf_dflt.forwarding) { 3648 if (valp != &ipv6_devconf.forwarding) { 3649 struct inet6_dev *idev = (struct inet6_dev *)table->extra1; 3650 int changed; 3651 if (unlikely(idev == NULL)) 3652 return -ENODEV; 3653 changed = (!*valp) ^ (!new); 3654 *valp = new; 3655 if (changed) 3656 dev_forward_change(idev); 3657 } else { 3658 *valp = new; 3659 addrconf_forward_change(); 3660 } 3661 3662 if (*valp) 3663 rt6_purge_dflt_routers(); 3664 } else 3665 *valp = new; 3666 3667 return 1; 3668 } 3669 3670 static struct addrconf_sysctl_table 3671 { 3672 struct ctl_table_header *sysctl_header; 3673 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3674 ctl_table addrconf_dev[2]; 3675 ctl_table addrconf_conf_dir[2]; 3676 ctl_table addrconf_proto_dir[2]; 3677 ctl_table addrconf_root_dir[2]; 3678 } addrconf_sysctl __read_mostly = { 3679 .sysctl_header = NULL, 3680 .addrconf_vars = { 3681 { 3682 .ctl_name = NET_IPV6_FORWARDING, 3683 .procname = "forwarding", 3684 .data = &ipv6_devconf.forwarding, 3685 .maxlen = sizeof(int), 3686 .mode = 0644, 3687 .proc_handler = &addrconf_sysctl_forward, 3688 .strategy = &addrconf_sysctl_forward_strategy, 3689 }, 3690 { 3691 .ctl_name = NET_IPV6_HOP_LIMIT, 3692 .procname = "hop_limit", 3693 .data = &ipv6_devconf.hop_limit, 3694 .maxlen = sizeof(int), 3695 .mode = 0644, 3696 .proc_handler = proc_dointvec, 3697 }, 3698 { 3699 .ctl_name = NET_IPV6_MTU, 3700 .procname = "mtu", 3701 .data = &ipv6_devconf.mtu6, 3702 .maxlen = sizeof(int), 3703 .mode = 0644, 3704 .proc_handler = &proc_dointvec, 3705 }, 3706 { 3707 .ctl_name = NET_IPV6_ACCEPT_RA, 3708 .procname = "accept_ra", 3709 .data = &ipv6_devconf.accept_ra, 3710 .maxlen = sizeof(int), 3711 .mode = 0644, 3712 .proc_handler = &proc_dointvec, 3713 }, 3714 { 3715 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3716 .procname = "accept_redirects", 3717 .data = &ipv6_devconf.accept_redirects, 3718 .maxlen = sizeof(int), 3719 .mode = 0644, 3720 .proc_handler = &proc_dointvec, 3721 }, 3722 { 3723 .ctl_name = NET_IPV6_AUTOCONF, 3724 .procname = "autoconf", 3725 .data = &ipv6_devconf.autoconf, 3726 .maxlen = sizeof(int), 3727 .mode = 0644, 3728 .proc_handler = &proc_dointvec, 3729 }, 3730 { 3731 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3732 .procname = "dad_transmits", 3733 .data = &ipv6_devconf.dad_transmits, 3734 .maxlen = sizeof(int), 3735 .mode = 0644, 3736 .proc_handler = &proc_dointvec, 3737 }, 3738 { 3739 .ctl_name = NET_IPV6_RTR_SOLICITS, 3740 .procname = "router_solicitations", 3741 .data = &ipv6_devconf.rtr_solicits, 3742 .maxlen = sizeof(int), 3743 .mode = 0644, 3744 .proc_handler = &proc_dointvec, 3745 }, 3746 { 3747 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3748 .procname = "router_solicitation_interval", 3749 .data = &ipv6_devconf.rtr_solicit_interval, 3750 .maxlen = sizeof(int), 3751 .mode = 0644, 3752 .proc_handler = &proc_dointvec_jiffies, 3753 .strategy = &sysctl_jiffies, 3754 }, 3755 { 3756 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3757 .procname = "router_solicitation_delay", 3758 .data = &ipv6_devconf.rtr_solicit_delay, 3759 .maxlen = sizeof(int), 3760 .mode = 0644, 3761 .proc_handler = &proc_dointvec_jiffies, 3762 .strategy = &sysctl_jiffies, 3763 }, 3764 { 3765 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3766 .procname = "force_mld_version", 3767 .data = &ipv6_devconf.force_mld_version, 3768 .maxlen = sizeof(int), 3769 .mode = 0644, 3770 .proc_handler = &proc_dointvec, 3771 }, 3772 #ifdef CONFIG_IPV6_PRIVACY 3773 { 3774 .ctl_name = NET_IPV6_USE_TEMPADDR, 3775 .procname = "use_tempaddr", 3776 .data = &ipv6_devconf.use_tempaddr, 3777 .maxlen = sizeof(int), 3778 .mode = 0644, 3779 .proc_handler = &proc_dointvec, 3780 }, 3781 { 3782 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3783 .procname = "temp_valid_lft", 3784 .data = &ipv6_devconf.temp_valid_lft, 3785 .maxlen = sizeof(int), 3786 .mode = 0644, 3787 .proc_handler = &proc_dointvec, 3788 }, 3789 { 3790 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3791 .procname = "temp_prefered_lft", 3792 .data = &ipv6_devconf.temp_prefered_lft, 3793 .maxlen = sizeof(int), 3794 .mode = 0644, 3795 .proc_handler = &proc_dointvec, 3796 }, 3797 { 3798 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3799 .procname = "regen_max_retry", 3800 .data = &ipv6_devconf.regen_max_retry, 3801 .maxlen = sizeof(int), 3802 .mode = 0644, 3803 .proc_handler = &proc_dointvec, 3804 }, 3805 { 3806 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3807 .procname = "max_desync_factor", 3808 .data = &ipv6_devconf.max_desync_factor, 3809 .maxlen = sizeof(int), 3810 .mode = 0644, 3811 .proc_handler = &proc_dointvec, 3812 }, 3813 #endif 3814 { 3815 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3816 .procname = "max_addresses", 3817 .data = &ipv6_devconf.max_addresses, 3818 .maxlen = sizeof(int), 3819 .mode = 0644, 3820 .proc_handler = &proc_dointvec, 3821 }, 3822 { 3823 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 3824 .procname = "accept_ra_defrtr", 3825 .data = &ipv6_devconf.accept_ra_defrtr, 3826 .maxlen = sizeof(int), 3827 .mode = 0644, 3828 .proc_handler = &proc_dointvec, 3829 }, 3830 { 3831 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 3832 .procname = "accept_ra_pinfo", 3833 .data = &ipv6_devconf.accept_ra_pinfo, 3834 .maxlen = sizeof(int), 3835 .mode = 0644, 3836 .proc_handler = &proc_dointvec, 3837 }, 3838 #ifdef CONFIG_IPV6_ROUTER_PREF 3839 { 3840 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 3841 .procname = "accept_ra_rtr_pref", 3842 .data = &ipv6_devconf.accept_ra_rtr_pref, 3843 .maxlen = sizeof(int), 3844 .mode = 0644, 3845 .proc_handler = &proc_dointvec, 3846 }, 3847 { 3848 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 3849 .procname = "router_probe_interval", 3850 .data = &ipv6_devconf.rtr_probe_interval, 3851 .maxlen = sizeof(int), 3852 .mode = 0644, 3853 .proc_handler = &proc_dointvec_jiffies, 3854 .strategy = &sysctl_jiffies, 3855 }, 3856 #ifdef CONFIV_IPV6_ROUTE_INFO 3857 { 3858 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 3859 .procname = "accept_ra_rt_info_max_plen", 3860 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 3861 .maxlen = sizeof(int), 3862 .mode = 0644, 3863 .proc_handler = &proc_dointvec, 3864 }, 3865 #endif 3866 #endif 3867 { 3868 .ctl_name = NET_IPV6_PROXY_NDP, 3869 .procname = "proxy_ndp", 3870 .data = &ipv6_devconf.proxy_ndp, 3871 .maxlen = sizeof(int), 3872 .mode = 0644, 3873 .proc_handler = &proc_dointvec, 3874 }, 3875 { 3876 .ctl_name = 0, /* sentinel */ 3877 } 3878 }, 3879 .addrconf_dev = { 3880 { 3881 .ctl_name = NET_PROTO_CONF_ALL, 3882 .procname = "all", 3883 .mode = 0555, 3884 .child = addrconf_sysctl.addrconf_vars, 3885 }, 3886 { 3887 .ctl_name = 0, /* sentinel */ 3888 } 3889 }, 3890 .addrconf_conf_dir = { 3891 { 3892 .ctl_name = NET_IPV6_CONF, 3893 .procname = "conf", 3894 .mode = 0555, 3895 .child = addrconf_sysctl.addrconf_dev, 3896 }, 3897 { 3898 .ctl_name = 0, /* sentinel */ 3899 } 3900 }, 3901 .addrconf_proto_dir = { 3902 { 3903 .ctl_name = NET_IPV6, 3904 .procname = "ipv6", 3905 .mode = 0555, 3906 .child = addrconf_sysctl.addrconf_conf_dir, 3907 }, 3908 { 3909 .ctl_name = 0, /* sentinel */ 3910 } 3911 }, 3912 .addrconf_root_dir = { 3913 { 3914 .ctl_name = CTL_NET, 3915 .procname = "net", 3916 .mode = 0555, 3917 .child = addrconf_sysctl.addrconf_proto_dir, 3918 }, 3919 { 3920 .ctl_name = 0, /* sentinel */ 3921 } 3922 }, 3923 }; 3924 3925 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) 3926 { 3927 int i; 3928 struct net_device *dev = idev ? idev->dev : NULL; 3929 struct addrconf_sysctl_table *t; 3930 char *dev_name = NULL; 3931 3932 t = kmalloc(sizeof(*t), GFP_KERNEL); 3933 if (t == NULL) 3934 return; 3935 memcpy(t, &addrconf_sysctl, sizeof(*t)); 3936 for (i=0; t->addrconf_vars[i].data; i++) { 3937 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 3938 t->addrconf_vars[i].de = NULL; 3939 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 3940 } 3941 if (dev) { 3942 dev_name = dev->name; 3943 t->addrconf_dev[0].ctl_name = dev->ifindex; 3944 } else { 3945 dev_name = "default"; 3946 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 3947 } 3948 3949 /* 3950 * Make a copy of dev_name, because '.procname' is regarded as const 3951 * by sysctl and we wouldn't want anyone to change it under our feet 3952 * (see SIOCSIFNAME). 3953 */ 3954 dev_name = kstrdup(dev_name, GFP_KERNEL); 3955 if (!dev_name) 3956 goto free; 3957 3958 t->addrconf_dev[0].procname = dev_name; 3959 3960 t->addrconf_dev[0].child = t->addrconf_vars; 3961 t->addrconf_dev[0].de = NULL; 3962 t->addrconf_conf_dir[0].child = t->addrconf_dev; 3963 t->addrconf_conf_dir[0].de = NULL; 3964 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; 3965 t->addrconf_proto_dir[0].de = NULL; 3966 t->addrconf_root_dir[0].child = t->addrconf_proto_dir; 3967 t->addrconf_root_dir[0].de = NULL; 3968 3969 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0); 3970 if (t->sysctl_header == NULL) 3971 goto free_procname; 3972 else 3973 p->sysctl = t; 3974 return; 3975 3976 /* error path */ 3977 free_procname: 3978 kfree(dev_name); 3979 free: 3980 kfree(t); 3981 3982 return; 3983 } 3984 3985 static void addrconf_sysctl_unregister(struct ipv6_devconf *p) 3986 { 3987 if (p->sysctl) { 3988 struct addrconf_sysctl_table *t = p->sysctl; 3989 p->sysctl = NULL; 3990 unregister_sysctl_table(t->sysctl_header); 3991 kfree(t->addrconf_dev[0].procname); 3992 kfree(t); 3993 } 3994 } 3995 3996 3997 #endif 3998 3999 /* 4000 * Device notifier 4001 */ 4002 4003 int register_inet6addr_notifier(struct notifier_block *nb) 4004 { 4005 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4006 } 4007 4008 int unregister_inet6addr_notifier(struct notifier_block *nb) 4009 { 4010 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 4011 } 4012 4013 /* 4014 * Init / cleanup code 4015 */ 4016 4017 int __init addrconf_init(void) 4018 { 4019 int err = 0; 4020 4021 /* The addrconf netdev notifier requires that loopback_dev 4022 * has it's ipv6 private information allocated and setup 4023 * before it can bring up and give link-local addresses 4024 * to other devices which are up. 4025 * 4026 * Unfortunately, loopback_dev is not necessarily the first 4027 * entry in the global dev_base list of net devices. In fact, 4028 * it is likely to be the very last entry on that list. 4029 * So this causes the notifier registry below to try and 4030 * give link-local addresses to all devices besides loopback_dev 4031 * first, then loopback_dev, which cases all the non-loopback_dev 4032 * devices to fail to get a link-local address. 4033 * 4034 * So, as a temporary fix, allocate the ipv6 structure for 4035 * loopback_dev first by hand. 4036 * Longer term, all of the dependencies ipv6 has upon the loopback 4037 * device and it being up should be removed. 4038 */ 4039 rtnl_lock(); 4040 if (!ipv6_add_dev(&loopback_dev)) 4041 err = -ENOMEM; 4042 rtnl_unlock(); 4043 if (err) 4044 return err; 4045 4046 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev); 4047 4048 register_netdevice_notifier(&ipv6_dev_notf); 4049 4050 addrconf_verify(0); 4051 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table; 4052 #ifdef CONFIG_SYSCTL 4053 addrconf_sysctl.sysctl_header = 4054 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0); 4055 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); 4056 #endif 4057 4058 return 0; 4059 } 4060 4061 void __exit addrconf_cleanup(void) 4062 { 4063 struct net_device *dev; 4064 struct inet6_dev *idev; 4065 struct inet6_ifaddr *ifa; 4066 int i; 4067 4068 unregister_netdevice_notifier(&ipv6_dev_notf); 4069 4070 rtnetlink_links[PF_INET6] = NULL; 4071 #ifdef CONFIG_SYSCTL 4072 addrconf_sysctl_unregister(&ipv6_devconf_dflt); 4073 addrconf_sysctl_unregister(&ipv6_devconf); 4074 #endif 4075 4076 rtnl_lock(); 4077 4078 /* 4079 * clean dev list. 4080 */ 4081 4082 for (dev=dev_base; dev; dev=dev->next) { 4083 if ((idev = __in6_dev_get(dev)) == NULL) 4084 continue; 4085 addrconf_ifdown(dev, 1); 4086 } 4087 addrconf_ifdown(&loopback_dev, 2); 4088 4089 /* 4090 * Check hash table. 4091 */ 4092 4093 write_lock_bh(&addrconf_hash_lock); 4094 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4095 for (ifa=inet6_addr_lst[i]; ifa; ) { 4096 struct inet6_ifaddr *bifa; 4097 4098 bifa = ifa; 4099 ifa = ifa->lst_next; 4100 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4101 /* Do not free it; something is wrong. 4102 Now we can investigate it with debugger. 4103 */ 4104 } 4105 } 4106 write_unlock_bh(&addrconf_hash_lock); 4107 4108 del_timer(&addr_chk_timer); 4109 4110 rtnl_unlock(); 4111 4112 #ifdef CONFIG_PROC_FS 4113 proc_net_remove("if_inet6"); 4114 #endif 4115 } 4116