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/config.h> 44 #include <linux/errno.h> 45 #include <linux/types.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/sched.h> 49 #include <linux/net.h> 50 #include <linux/in6.h> 51 #include <linux/netdevice.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/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/sock.h> 66 #include <net/snmp.h> 67 68 #include <net/ipv6.h> 69 #include <net/protocol.h> 70 #include <net/ndisc.h> 71 #include <net/ip6_route.h> 72 #include <net/addrconf.h> 73 #include <net/tcp.h> 74 #include <net/ip.h> 75 #include <linux/if_tunnel.h> 76 #include <linux/rtnetlink.h> 77 78 #ifdef CONFIG_IPV6_PRIVACY 79 #include <linux/random.h> 80 #include <linux/crypto.h> 81 #include <linux/scatterlist.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 static struct crypto_tfm *md5_tfm; 113 static DEFINE_SPINLOCK(md5_tfm_lock); 114 #endif 115 116 static int ipv6_count_addresses(struct inet6_dev *idev); 117 118 /* 119 * Configured unicast address hash table 120 */ 121 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 122 static DEFINE_RWLOCK(addrconf_hash_lock); 123 124 /* Protects inet6 devices */ 125 DEFINE_RWLOCK(addrconf_lock); 126 127 static void addrconf_verify(unsigned long); 128 129 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 130 static DEFINE_SPINLOCK(addrconf_verify_lock); 131 132 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 133 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 134 135 static int addrconf_ifdown(struct net_device *dev, int how); 136 137 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 138 static void addrconf_dad_timer(unsigned long data); 139 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 140 static void addrconf_rs_timer(unsigned long data); 141 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 142 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 143 144 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 145 struct prefix_info *pinfo); 146 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); 147 148 static struct notifier_block *inet6addr_chain; 149 150 struct ipv6_devconf ipv6_devconf = { 151 .forwarding = 0, 152 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 153 .mtu6 = IPV6_MIN_MTU, 154 .accept_ra = 1, 155 .accept_redirects = 1, 156 .autoconf = 1, 157 .force_mld_version = 0, 158 .dad_transmits = 1, 159 .rtr_solicits = MAX_RTR_SOLICITATIONS, 160 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 161 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 162 #ifdef CONFIG_IPV6_PRIVACY 163 .use_tempaddr = 0, 164 .temp_valid_lft = TEMP_VALID_LIFETIME, 165 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 166 .regen_max_retry = REGEN_MAX_RETRY, 167 .max_desync_factor = MAX_DESYNC_FACTOR, 168 #endif 169 .max_addresses = IPV6_MAX_ADDRESSES, 170 }; 171 172 static struct ipv6_devconf ipv6_devconf_dflt = { 173 .forwarding = 0, 174 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 175 .mtu6 = IPV6_MIN_MTU, 176 .accept_ra = 1, 177 .accept_redirects = 1, 178 .autoconf = 1, 179 .dad_transmits = 1, 180 .rtr_solicits = MAX_RTR_SOLICITATIONS, 181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 183 #ifdef CONFIG_IPV6_PRIVACY 184 .use_tempaddr = 0, 185 .temp_valid_lft = TEMP_VALID_LIFETIME, 186 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 187 .regen_max_retry = REGEN_MAX_RETRY, 188 .max_desync_factor = MAX_DESYNC_FACTOR, 189 #endif 190 .max_addresses = IPV6_MAX_ADDRESSES, 191 }; 192 193 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 194 #if 0 195 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 196 #endif 197 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 198 199 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16) 200 201 static inline unsigned ipv6_addr_scope2type(unsigned scope) 202 { 203 switch(scope) { 204 case IPV6_ADDR_SCOPE_NODELOCAL: 205 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) | 206 IPV6_ADDR_LOOPBACK); 207 case IPV6_ADDR_SCOPE_LINKLOCAL: 208 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) | 209 IPV6_ADDR_LINKLOCAL); 210 case IPV6_ADDR_SCOPE_SITELOCAL: 211 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) | 212 IPV6_ADDR_SITELOCAL); 213 } 214 return IPV6_ADDR_SCOPE_TYPE(scope); 215 } 216 217 int __ipv6_addr_type(const struct in6_addr *addr) 218 { 219 u32 st; 220 221 st = addr->s6_addr32[0]; 222 223 /* Consider all addresses with the first three bits different of 224 000 and 111 as unicasts. 225 */ 226 if ((st & htonl(0xE0000000)) != htonl(0x00000000) && 227 (st & htonl(0xE0000000)) != htonl(0xE0000000)) 228 return (IPV6_ADDR_UNICAST | 229 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); 230 231 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) { 232 /* multicast */ 233 /* addr-select 3.1 */ 234 return (IPV6_ADDR_MULTICAST | 235 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr))); 236 } 237 238 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000)) 239 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 240 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */ 241 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000)) 242 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST | 243 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */ 244 245 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) { 246 if (addr->s6_addr32[2] == 0) { 247 if (addr->s6_addr32[3] == 0) 248 return IPV6_ADDR_ANY; 249 250 if (addr->s6_addr32[3] == htonl(0x00000001)) 251 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST | 252 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */ 253 254 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST | 255 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 256 } 257 258 if (addr->s6_addr32[2] == htonl(0x0000ffff)) 259 return (IPV6_ADDR_MAPPED | 260 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 261 } 262 263 return (IPV6_ADDR_RESERVED | 264 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */ 265 } 266 267 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 268 { 269 if (del_timer(&ifp->timer)) 270 __in6_ifa_put(ifp); 271 } 272 273 enum addrconf_timer_t 274 { 275 AC_NONE, 276 AC_DAD, 277 AC_RS, 278 }; 279 280 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 281 enum addrconf_timer_t what, 282 unsigned long when) 283 { 284 if (!del_timer(&ifp->timer)) 285 in6_ifa_hold(ifp); 286 287 switch (what) { 288 case AC_DAD: 289 ifp->timer.function = addrconf_dad_timer; 290 break; 291 case AC_RS: 292 ifp->timer.function = addrconf_rs_timer; 293 break; 294 default:; 295 } 296 ifp->timer.expires = jiffies + when; 297 add_timer(&ifp->timer); 298 } 299 300 /* Nobody refers to this device, we may destroy it. */ 301 302 void in6_dev_finish_destroy(struct inet6_dev *idev) 303 { 304 struct net_device *dev = idev->dev; 305 BUG_TRAP(idev->addr_list==NULL); 306 BUG_TRAP(idev->mc_list==NULL); 307 #ifdef NET_REFCNT_DEBUG 308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 309 #endif 310 dev_put(dev); 311 if (!idev->dead) { 312 printk("Freeing alive inet6 device %p\n", idev); 313 return; 314 } 315 snmp6_free_dev(idev); 316 kfree(idev); 317 } 318 319 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 320 { 321 struct inet6_dev *ndev; 322 323 ASSERT_RTNL(); 324 325 if (dev->mtu < IPV6_MIN_MTU) 326 return NULL; 327 328 ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL); 329 330 if (ndev) { 331 memset(ndev, 0, sizeof(struct inet6_dev)); 332 333 rwlock_init(&ndev->lock); 334 ndev->dev = dev; 335 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf)); 336 ndev->cnf.mtu6 = dev->mtu; 337 ndev->cnf.sysctl = NULL; 338 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 339 if (ndev->nd_parms == NULL) { 340 kfree(ndev); 341 return NULL; 342 } 343 /* We refer to the device */ 344 dev_hold(dev); 345 346 if (snmp6_alloc_dev(ndev) < 0) { 347 ADBG((KERN_WARNING 348 "%s(): cannot allocate memory for statistics; dev=%s.\n", 349 __FUNCTION__, dev->name)); 350 neigh_parms_release(&nd_tbl, ndev->nd_parms); 351 ndev->dead = 1; 352 in6_dev_finish_destroy(ndev); 353 return NULL; 354 } 355 356 if (snmp6_register_dev(ndev) < 0) { 357 ADBG((KERN_WARNING 358 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 359 __FUNCTION__, dev->name)); 360 neigh_parms_release(&nd_tbl, ndev->nd_parms); 361 ndev->dead = 1; 362 in6_dev_finish_destroy(ndev); 363 return NULL; 364 } 365 366 /* One reference from device. We must do this before 367 * we invoke __ipv6_regen_rndid(). 368 */ 369 in6_dev_hold(ndev); 370 371 #ifdef CONFIG_IPV6_PRIVACY 372 get_random_bytes(ndev->rndid, sizeof(ndev->rndid)); 373 get_random_bytes(ndev->entropy, sizeof(ndev->entropy)); 374 init_timer(&ndev->regen_timer); 375 ndev->regen_timer.function = ipv6_regen_rndid; 376 ndev->regen_timer.data = (unsigned long) ndev; 377 if ((dev->flags&IFF_LOOPBACK) || 378 dev->type == ARPHRD_TUNNEL || 379 dev->type == ARPHRD_NONE || 380 dev->type == ARPHRD_SIT) { 381 printk(KERN_INFO 382 "%s: Disabled Privacy Extensions\n", 383 dev->name); 384 ndev->cnf.use_tempaddr = -1; 385 } else { 386 in6_dev_hold(ndev); 387 ipv6_regen_rndid((unsigned long) ndev); 388 } 389 #endif 390 391 write_lock_bh(&addrconf_lock); 392 dev->ip6_ptr = ndev; 393 write_unlock_bh(&addrconf_lock); 394 395 ipv6_mc_init_dev(ndev); 396 ndev->tstamp = jiffies; 397 #ifdef CONFIG_SYSCTL 398 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 399 NET_IPV6_NEIGH, "ipv6", 400 &ndisc_ifinfo_sysctl_change, 401 NULL); 402 addrconf_sysctl_register(ndev, &ndev->cnf); 403 #endif 404 } 405 return ndev; 406 } 407 408 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 409 { 410 struct inet6_dev *idev; 411 412 ASSERT_RTNL(); 413 414 if ((idev = __in6_dev_get(dev)) == NULL) { 415 if ((idev = ipv6_add_dev(dev)) == NULL) 416 return NULL; 417 } 418 if (dev->flags&IFF_UP) 419 ipv6_mc_up(idev); 420 return idev; 421 } 422 423 #ifdef CONFIG_SYSCTL 424 static void dev_forward_change(struct inet6_dev *idev) 425 { 426 struct net_device *dev; 427 struct inet6_ifaddr *ifa; 428 struct in6_addr addr; 429 430 if (!idev) 431 return; 432 dev = idev->dev; 433 if (dev && (dev->flags & IFF_MULTICAST)) { 434 ipv6_addr_all_routers(&addr); 435 436 if (idev->cnf.forwarding) 437 ipv6_dev_mc_inc(dev, &addr); 438 else 439 ipv6_dev_mc_dec(dev, &addr); 440 } 441 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 442 if (idev->cnf.forwarding) 443 addrconf_join_anycast(ifa); 444 else 445 addrconf_leave_anycast(ifa); 446 } 447 } 448 449 450 static void addrconf_forward_change(void) 451 { 452 struct net_device *dev; 453 struct inet6_dev *idev; 454 455 read_lock(&dev_base_lock); 456 for (dev=dev_base; dev; dev=dev->next) { 457 read_lock(&addrconf_lock); 458 idev = __in6_dev_get(dev); 459 if (idev) { 460 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); 461 idev->cnf.forwarding = ipv6_devconf.forwarding; 462 if (changed) 463 dev_forward_change(idev); 464 } 465 read_unlock(&addrconf_lock); 466 } 467 read_unlock(&dev_base_lock); 468 } 469 #endif 470 471 /* Nobody refers to this ifaddr, destroy it */ 472 473 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 474 { 475 BUG_TRAP(ifp->if_next==NULL); 476 BUG_TRAP(ifp->lst_next==NULL); 477 #ifdef NET_REFCNT_DEBUG 478 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 479 #endif 480 481 in6_dev_put(ifp->idev); 482 483 if (del_timer(&ifp->timer)) 484 printk("Timer is still running, when freeing ifa=%p\n", ifp); 485 486 if (!ifp->dead) { 487 printk("Freeing alive inet6 address %p\n", ifp); 488 return; 489 } 490 dst_release(&ifp->rt->u.dst); 491 492 kfree(ifp); 493 } 494 495 /* On success it returns ifp with increased reference count */ 496 497 static struct inet6_ifaddr * 498 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 499 int scope, u32 flags) 500 { 501 struct inet6_ifaddr *ifa = NULL; 502 struct rt6_info *rt; 503 int hash; 504 int err = 0; 505 506 read_lock_bh(&addrconf_lock); 507 if (idev->dead) { 508 err = -ENODEV; /*XXX*/ 509 goto out2; 510 } 511 512 write_lock(&addrconf_hash_lock); 513 514 /* Ignore adding duplicate addresses on an interface */ 515 if (ipv6_chk_same_addr(addr, idev->dev)) { 516 ADBG(("ipv6_add_addr: already assigned\n")); 517 err = -EEXIST; 518 goto out; 519 } 520 521 ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 522 523 if (ifa == NULL) { 524 ADBG(("ipv6_add_addr: malloc failed\n")); 525 err = -ENOBUFS; 526 goto out; 527 } 528 529 rt = addrconf_dst_alloc(idev, addr, 0); 530 if (IS_ERR(rt)) { 531 err = PTR_ERR(rt); 532 goto out; 533 } 534 535 memset(ifa, 0, sizeof(struct inet6_ifaddr)); 536 ipv6_addr_copy(&ifa->addr, addr); 537 538 spin_lock_init(&ifa->lock); 539 init_timer(&ifa->timer); 540 ifa->timer.data = (unsigned long) ifa; 541 ifa->scope = scope; 542 ifa->prefix_len = pfxlen; 543 ifa->flags = flags | IFA_F_TENTATIVE; 544 ifa->cstamp = ifa->tstamp = jiffies; 545 546 ifa->idev = idev; 547 in6_dev_hold(idev); 548 /* For caller */ 549 in6_ifa_hold(ifa); 550 551 /* Add to big hash table */ 552 hash = ipv6_addr_hash(addr); 553 554 ifa->lst_next = inet6_addr_lst[hash]; 555 inet6_addr_lst[hash] = ifa; 556 in6_ifa_hold(ifa); 557 write_unlock(&addrconf_hash_lock); 558 559 write_lock(&idev->lock); 560 /* Add to inet6_dev unicast addr list. */ 561 ifa->if_next = idev->addr_list; 562 idev->addr_list = ifa; 563 564 #ifdef CONFIG_IPV6_PRIVACY 565 if (ifa->flags&IFA_F_TEMPORARY) { 566 ifa->tmp_next = idev->tempaddr_list; 567 idev->tempaddr_list = ifa; 568 in6_ifa_hold(ifa); 569 } 570 #endif 571 572 ifa->rt = rt; 573 574 in6_ifa_hold(ifa); 575 write_unlock(&idev->lock); 576 out2: 577 read_unlock_bh(&addrconf_lock); 578 579 if (likely(err == 0)) 580 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 581 else { 582 kfree(ifa); 583 ifa = ERR_PTR(err); 584 } 585 586 return ifa; 587 out: 588 write_unlock(&addrconf_hash_lock); 589 goto out2; 590 } 591 592 /* This function wants to get referenced ifp and releases it before return */ 593 594 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 595 { 596 struct inet6_ifaddr *ifa, **ifap; 597 struct inet6_dev *idev = ifp->idev; 598 int hash; 599 int deleted = 0, onlink = 0; 600 unsigned long expires = jiffies; 601 602 hash = ipv6_addr_hash(&ifp->addr); 603 604 ifp->dead = 1; 605 606 write_lock_bh(&addrconf_hash_lock); 607 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 608 ifap = &ifa->lst_next) { 609 if (ifa == ifp) { 610 *ifap = ifa->lst_next; 611 __in6_ifa_put(ifp); 612 ifa->lst_next = NULL; 613 break; 614 } 615 } 616 write_unlock_bh(&addrconf_hash_lock); 617 618 write_lock_bh(&idev->lock); 619 #ifdef CONFIG_IPV6_PRIVACY 620 if (ifp->flags&IFA_F_TEMPORARY) { 621 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 622 ifap = &ifa->tmp_next) { 623 if (ifa == ifp) { 624 *ifap = ifa->tmp_next; 625 if (ifp->ifpub) { 626 in6_ifa_put(ifp->ifpub); 627 ifp->ifpub = NULL; 628 } 629 __in6_ifa_put(ifp); 630 ifa->tmp_next = NULL; 631 break; 632 } 633 } 634 } 635 #endif 636 637 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL; 638 ifap = &ifa->if_next) { 639 if (ifa == ifp) { 640 *ifap = ifa->if_next; 641 __in6_ifa_put(ifp); 642 ifa->if_next = NULL; 643 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 644 break; 645 deleted = 1; 646 } else if (ifp->flags & IFA_F_PERMANENT) { 647 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 648 ifp->prefix_len)) { 649 if (ifa->flags & IFA_F_PERMANENT) { 650 onlink = 1; 651 if (deleted) 652 break; 653 } else { 654 unsigned long lifetime; 655 656 if (!onlink) 657 onlink = -1; 658 659 spin_lock(&ifa->lock); 660 lifetime = min_t(unsigned long, 661 ifa->valid_lft, 0x7fffffffUL/HZ); 662 if (time_before(expires, 663 ifa->tstamp + lifetime * HZ)) 664 expires = ifa->tstamp + lifetime * HZ; 665 spin_unlock(&ifa->lock); 666 } 667 } 668 } 669 } 670 write_unlock_bh(&idev->lock); 671 672 ipv6_ifa_notify(RTM_DELADDR, ifp); 673 674 notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp); 675 676 addrconf_del_timer(ifp); 677 678 /* 679 * Purge or update corresponding prefix 680 * 681 * 1) we don't purge prefix here if address was not permanent. 682 * prefix is managed by its own lifetime. 683 * 2) if there're no addresses, delete prefix. 684 * 3) if there're still other permanent address(es), 685 * corresponding prefix is still permanent. 686 * 4) otherwise, update prefix lifetime to the 687 * longest valid lifetime among the corresponding 688 * addresses on the device. 689 * Note: subsequent RA will update lifetime. 690 * 691 * --yoshfuji 692 */ 693 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 694 struct in6_addr prefix; 695 struct rt6_info *rt; 696 697 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 698 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 699 700 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 701 if (onlink == 0) { 702 ip6_del_rt(rt, NULL, NULL, NULL); 703 rt = NULL; 704 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 705 rt->rt6i_expires = expires; 706 rt->rt6i_flags |= RTF_EXPIRES; 707 } 708 } 709 dst_release(&rt->u.dst); 710 } 711 712 in6_ifa_put(ifp); 713 } 714 715 #ifdef CONFIG_IPV6_PRIVACY 716 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 717 { 718 struct inet6_dev *idev = ifp->idev; 719 struct in6_addr addr, *tmpaddr; 720 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 721 int tmp_plen; 722 int ret = 0; 723 int max_addresses; 724 725 write_lock(&idev->lock); 726 if (ift) { 727 spin_lock_bh(&ift->lock); 728 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 729 spin_unlock_bh(&ift->lock); 730 tmpaddr = &addr; 731 } else { 732 tmpaddr = NULL; 733 } 734 retry: 735 in6_dev_hold(idev); 736 if (idev->cnf.use_tempaddr <= 0) { 737 write_unlock(&idev->lock); 738 printk(KERN_INFO 739 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 740 in6_dev_put(idev); 741 ret = -1; 742 goto out; 743 } 744 spin_lock_bh(&ifp->lock); 745 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 746 idev->cnf.use_tempaddr = -1; /*XXX*/ 747 spin_unlock_bh(&ifp->lock); 748 write_unlock(&idev->lock); 749 printk(KERN_WARNING 750 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 751 in6_dev_put(idev); 752 ret = -1; 753 goto out; 754 } 755 in6_ifa_hold(ifp); 756 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 757 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 758 spin_unlock_bh(&ifp->lock); 759 write_unlock(&idev->lock); 760 printk(KERN_WARNING 761 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 762 in6_ifa_put(ifp); 763 in6_dev_put(idev); 764 ret = -1; 765 goto out; 766 } 767 memcpy(&addr.s6_addr[8], idev->rndid, 8); 768 tmp_valid_lft = min_t(__u32, 769 ifp->valid_lft, 770 idev->cnf.temp_valid_lft); 771 tmp_prefered_lft = min_t(__u32, 772 ifp->prefered_lft, 773 idev->cnf.temp_prefered_lft - desync_factor / HZ); 774 tmp_plen = ifp->prefix_len; 775 max_addresses = idev->cnf.max_addresses; 776 tmp_cstamp = ifp->cstamp; 777 tmp_tstamp = ifp->tstamp; 778 spin_unlock_bh(&ifp->lock); 779 780 write_unlock(&idev->lock); 781 ift = !max_addresses || 782 ipv6_count_addresses(idev) < max_addresses ? 783 ipv6_add_addr(idev, &addr, tmp_plen, 784 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL; 785 if (!ift || IS_ERR(ift)) { 786 in6_ifa_put(ifp); 787 in6_dev_put(idev); 788 printk(KERN_INFO 789 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 790 tmpaddr = &addr; 791 write_lock(&idev->lock); 792 goto retry; 793 } 794 795 spin_lock_bh(&ift->lock); 796 ift->ifpub = ifp; 797 ift->valid_lft = tmp_valid_lft; 798 ift->prefered_lft = tmp_prefered_lft; 799 ift->cstamp = tmp_cstamp; 800 ift->tstamp = tmp_tstamp; 801 spin_unlock_bh(&ift->lock); 802 803 addrconf_dad_start(ift, 0); 804 in6_ifa_put(ift); 805 in6_dev_put(idev); 806 out: 807 return ret; 808 } 809 #endif 810 811 /* 812 * Choose an appropriate source address (RFC3484) 813 */ 814 struct ipv6_saddr_score { 815 int addr_type; 816 unsigned int attrs; 817 int matchlen; 818 unsigned int scope; 819 unsigned int rule; 820 }; 821 822 #define IPV6_SADDR_SCORE_LOCAL 0x0001 823 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 824 #define IPV6_SADDR_SCORE_HOA 0x0008 825 #define IPV6_SADDR_SCORE_OIF 0x0010 826 #define IPV6_SADDR_SCORE_LABEL 0x0020 827 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 828 829 static int inline ipv6_saddr_preferred(int type) 830 { 831 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 832 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 833 return 1; 834 return 0; 835 } 836 837 /* static matching label */ 838 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type) 839 { 840 /* 841 * prefix (longest match) label 842 * ----------------------------- 843 * ::1/128 0 844 * ::/0 1 845 * 2002::/16 2 846 * ::/96 3 847 * ::ffff:0:0/96 4 848 */ 849 if (type & IPV6_ADDR_LOOPBACK) 850 return 0; 851 else if (type & IPV6_ADDR_COMPATv4) 852 return 3; 853 else if (type & IPV6_ADDR_MAPPED) 854 return 4; 855 else if (addr->s6_addr16[0] == htons(0x2002)) 856 return 2; 857 return 1; 858 } 859 860 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 861 struct in6_addr *daddr, struct in6_addr *saddr) 862 { 863 struct ipv6_saddr_score hiscore; 864 struct inet6_ifaddr *ifa_result = NULL; 865 int daddr_type = __ipv6_addr_type(daddr); 866 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 867 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type); 868 struct net_device *dev; 869 870 memset(&hiscore, 0, sizeof(hiscore)); 871 872 read_lock(&dev_base_lock); 873 read_lock(&addrconf_lock); 874 875 for (dev = dev_base; dev; dev=dev->next) { 876 struct inet6_dev *idev; 877 struct inet6_ifaddr *ifa; 878 879 /* Rule 0: Candidate Source Address (section 4) 880 * - multicast and link-local destination address, 881 * the set of candidate source address MUST only 882 * include addresses assigned to interfaces 883 * belonging to the same link as the outgoing 884 * interface. 885 * (- For site-local destination addresses, the 886 * set of candidate source addresses MUST only 887 * include addresses assigned to interfaces 888 * belonging to the same site as the outgoing 889 * interface.) 890 */ 891 if ((daddr_type & IPV6_ADDR_MULTICAST || 892 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 893 daddr_dev && dev != daddr_dev) 894 continue; 895 896 idev = __in6_dev_get(dev); 897 if (!idev) 898 continue; 899 900 read_lock_bh(&idev->lock); 901 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 902 struct ipv6_saddr_score score; 903 904 score.addr_type = __ipv6_addr_type(&ifa->addr); 905 906 /* Rule 0: Candidate Source Address (section 4) 907 * - In any case, anycast addresses, multicast 908 * addresses, and the unspecified address MUST 909 * NOT be included in a candidate set. 910 */ 911 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 912 score.addr_type & IPV6_ADDR_MULTICAST)) { 913 LIMIT_NETDEBUG(KERN_DEBUG 914 "ADDRCONF: unspecified / multicast address" 915 "assigned as unicast address on %s", 916 dev->name); 917 continue; 918 } 919 920 score.attrs = 0; 921 score.matchlen = 0; 922 score.scope = 0; 923 score.rule = 0; 924 925 if (ifa_result == NULL) { 926 /* record it if the first available entry */ 927 goto record_it; 928 } 929 930 /* Rule 1: Prefer same address */ 931 if (hiscore.rule < 1) { 932 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 933 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 934 hiscore.rule++; 935 } 936 if (ipv6_addr_equal(&ifa->addr, daddr)) { 937 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 938 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 939 score.rule = 1; 940 goto record_it; 941 } 942 } else { 943 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 944 continue; 945 } 946 947 /* Rule 2: Prefer appropriate scope */ 948 if (hiscore.rule < 2) { 949 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 950 hiscore.rule++; 951 } 952 score.scope = __ipv6_addr_src_scope(score.addr_type); 953 if (hiscore.scope < score.scope) { 954 if (hiscore.scope < daddr_scope) { 955 score.rule = 2; 956 goto record_it; 957 } else 958 continue; 959 } else if (score.scope < hiscore.scope) { 960 if (score.scope < daddr_scope) 961 continue; 962 else { 963 score.rule = 2; 964 goto record_it; 965 } 966 } 967 968 /* Rule 3: Avoid deprecated address */ 969 if (hiscore.rule < 3) { 970 if (ipv6_saddr_preferred(hiscore.addr_type) || 971 !(ifa_result->flags & IFA_F_DEPRECATED)) 972 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 973 hiscore.rule++; 974 } 975 if (ipv6_saddr_preferred(score.addr_type) || 976 !(ifa->flags & IFA_F_DEPRECATED)) { 977 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 978 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 979 score.rule = 3; 980 goto record_it; 981 } 982 } else { 983 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 984 continue; 985 } 986 987 /* Rule 4: Prefer home address -- not implemented yet */ 988 if (hiscore.rule < 4) 989 hiscore.rule++; 990 991 /* Rule 5: Prefer outgoing interface */ 992 if (hiscore.rule < 5) { 993 if (daddr_dev == NULL || 994 daddr_dev == ifa_result->idev->dev) 995 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 996 hiscore.rule++; 997 } 998 if (daddr_dev == NULL || 999 daddr_dev == ifa->idev->dev) { 1000 score.attrs |= IPV6_SADDR_SCORE_OIF; 1001 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1002 score.rule = 5; 1003 goto record_it; 1004 } 1005 } else { 1006 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1007 continue; 1008 } 1009 1010 /* Rule 6: Prefer matching label */ 1011 if (hiscore.rule < 6) { 1012 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) 1013 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1014 hiscore.rule++; 1015 } 1016 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { 1017 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1018 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1019 score.rule = 6; 1020 goto record_it; 1021 } 1022 } else { 1023 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1024 continue; 1025 } 1026 1027 #ifdef CONFIG_IPV6_PRIVACY 1028 /* Rule 7: Prefer public address 1029 * Note: prefer temprary address if use_tempaddr >= 2 1030 */ 1031 if (hiscore.rule < 7) { 1032 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1033 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1034 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1035 hiscore.rule++; 1036 } 1037 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1038 (ifa->idev->cnf.use_tempaddr >= 2)) { 1039 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1040 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1041 score.rule = 7; 1042 goto record_it; 1043 } 1044 } else { 1045 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1046 continue; 1047 } 1048 #endif 1049 /* Rule 8: Use longest matching prefix */ 1050 if (hiscore.rule < 8) { 1051 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1052 hiscore.rule++; 1053 } 1054 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1055 if (score.matchlen > hiscore.matchlen) { 1056 score.rule = 8; 1057 goto record_it; 1058 } 1059 #if 0 1060 else if (score.matchlen < hiscore.matchlen) 1061 continue; 1062 #endif 1063 1064 /* Final Rule: choose first available one */ 1065 continue; 1066 record_it: 1067 if (ifa_result) 1068 in6_ifa_put(ifa_result); 1069 in6_ifa_hold(ifa); 1070 ifa_result = ifa; 1071 hiscore = score; 1072 } 1073 read_unlock_bh(&idev->lock); 1074 } 1075 read_unlock(&addrconf_lock); 1076 read_unlock(&dev_base_lock); 1077 1078 if (!ifa_result) 1079 return -EADDRNOTAVAIL; 1080 1081 ipv6_addr_copy(saddr, &ifa_result->addr); 1082 in6_ifa_put(ifa_result); 1083 return 0; 1084 } 1085 1086 1087 int ipv6_get_saddr(struct dst_entry *dst, 1088 struct in6_addr *daddr, struct in6_addr *saddr) 1089 { 1090 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr); 1091 } 1092 1093 1094 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr) 1095 { 1096 struct inet6_dev *idev; 1097 int err = -EADDRNOTAVAIL; 1098 1099 read_lock(&addrconf_lock); 1100 if ((idev = __in6_dev_get(dev)) != NULL) { 1101 struct inet6_ifaddr *ifp; 1102 1103 read_lock_bh(&idev->lock); 1104 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1105 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1106 ipv6_addr_copy(addr, &ifp->addr); 1107 err = 0; 1108 break; 1109 } 1110 } 1111 read_unlock_bh(&idev->lock); 1112 } 1113 read_unlock(&addrconf_lock); 1114 return err; 1115 } 1116 1117 static int ipv6_count_addresses(struct inet6_dev *idev) 1118 { 1119 int cnt = 0; 1120 struct inet6_ifaddr *ifp; 1121 1122 read_lock_bh(&idev->lock); 1123 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1124 cnt++; 1125 read_unlock_bh(&idev->lock); 1126 return cnt; 1127 } 1128 1129 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1130 { 1131 struct inet6_ifaddr * ifp; 1132 u8 hash = ipv6_addr_hash(addr); 1133 1134 read_lock_bh(&addrconf_hash_lock); 1135 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1136 if (ipv6_addr_equal(&ifp->addr, addr) && 1137 !(ifp->flags&IFA_F_TENTATIVE)) { 1138 if (dev == NULL || ifp->idev->dev == dev || 1139 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1140 break; 1141 } 1142 } 1143 read_unlock_bh(&addrconf_hash_lock); 1144 return ifp != NULL; 1145 } 1146 1147 static 1148 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1149 { 1150 struct inet6_ifaddr * ifp; 1151 u8 hash = ipv6_addr_hash(addr); 1152 1153 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1154 if (ipv6_addr_equal(&ifp->addr, addr)) { 1155 if (dev == NULL || ifp->idev->dev == dev) 1156 break; 1157 } 1158 } 1159 return ifp != NULL; 1160 } 1161 1162 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1163 { 1164 struct inet6_ifaddr * ifp; 1165 u8 hash = ipv6_addr_hash(addr); 1166 1167 read_lock_bh(&addrconf_hash_lock); 1168 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1169 if (ipv6_addr_equal(&ifp->addr, addr)) { 1170 if (dev == NULL || ifp->idev->dev == dev || 1171 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1172 in6_ifa_hold(ifp); 1173 break; 1174 } 1175 } 1176 } 1177 read_unlock_bh(&addrconf_hash_lock); 1178 1179 return ifp; 1180 } 1181 1182 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1183 { 1184 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1185 const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2); 1186 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1187 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1188 int sk_ipv6only = ipv6_only_sock(sk); 1189 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1190 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1191 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1192 1193 if (!sk2_rcv_saddr && !sk_ipv6only) 1194 return 1; 1195 1196 if (addr_type2 == IPV6_ADDR_ANY && 1197 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1198 return 1; 1199 1200 if (addr_type == IPV6_ADDR_ANY && 1201 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1202 return 1; 1203 1204 if (sk2_rcv_saddr6 && 1205 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1206 return 1; 1207 1208 if (addr_type == IPV6_ADDR_MAPPED && 1209 !sk2_ipv6only && 1210 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1211 return 1; 1212 1213 return 0; 1214 } 1215 1216 /* Gets referenced address, destroys ifaddr */ 1217 1218 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1219 { 1220 if (net_ratelimit()) 1221 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1222 if (ifp->flags&IFA_F_PERMANENT) { 1223 spin_lock_bh(&ifp->lock); 1224 addrconf_del_timer(ifp); 1225 ifp->flags |= IFA_F_TENTATIVE; 1226 spin_unlock_bh(&ifp->lock); 1227 in6_ifa_put(ifp); 1228 #ifdef CONFIG_IPV6_PRIVACY 1229 } else if (ifp->flags&IFA_F_TEMPORARY) { 1230 struct inet6_ifaddr *ifpub; 1231 spin_lock_bh(&ifp->lock); 1232 ifpub = ifp->ifpub; 1233 if (ifpub) { 1234 in6_ifa_hold(ifpub); 1235 spin_unlock_bh(&ifp->lock); 1236 ipv6_create_tempaddr(ifpub, ifp); 1237 in6_ifa_put(ifpub); 1238 } else { 1239 spin_unlock_bh(&ifp->lock); 1240 } 1241 ipv6_del_addr(ifp); 1242 #endif 1243 } else 1244 ipv6_del_addr(ifp); 1245 } 1246 1247 1248 /* Join to solicited addr multicast group. */ 1249 1250 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1251 { 1252 struct in6_addr maddr; 1253 1254 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1255 return; 1256 1257 addrconf_addr_solict_mult(addr, &maddr); 1258 ipv6_dev_mc_inc(dev, &maddr); 1259 } 1260 1261 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1262 { 1263 struct in6_addr maddr; 1264 1265 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1266 return; 1267 1268 addrconf_addr_solict_mult(addr, &maddr); 1269 __ipv6_dev_mc_dec(idev, &maddr); 1270 } 1271 1272 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1273 { 1274 struct in6_addr addr; 1275 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1276 if (ipv6_addr_any(&addr)) 1277 return; 1278 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1279 } 1280 1281 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1282 { 1283 struct in6_addr addr; 1284 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1285 if (ipv6_addr_any(&addr)) 1286 return; 1287 __ipv6_dev_ac_dec(ifp->idev, &addr); 1288 } 1289 1290 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1291 { 1292 switch (dev->type) { 1293 case ARPHRD_ETHER: 1294 case ARPHRD_FDDI: 1295 case ARPHRD_IEEE802_TR: 1296 if (dev->addr_len != ETH_ALEN) 1297 return -1; 1298 memcpy(eui, dev->dev_addr, 3); 1299 memcpy(eui + 5, dev->dev_addr + 3, 3); 1300 1301 /* 1302 * The zSeries OSA network cards can be shared among various 1303 * OS instances, but the OSA cards have only one MAC address. 1304 * This leads to duplicate address conflicts in conjunction 1305 * with IPv6 if more than one instance uses the same card. 1306 * 1307 * The driver for these cards can deliver a unique 16-bit 1308 * identifier for each instance sharing the same card. It is 1309 * placed instead of 0xFFFE in the interface identifier. The 1310 * "u" bit of the interface identifier is not inverted in this 1311 * case. Hence the resulting interface identifier has local 1312 * scope according to RFC2373. 1313 */ 1314 if (dev->dev_id) { 1315 eui[3] = (dev->dev_id >> 8) & 0xFF; 1316 eui[4] = dev->dev_id & 0xFF; 1317 } else { 1318 eui[3] = 0xFF; 1319 eui[4] = 0xFE; 1320 eui[0] ^= 2; 1321 } 1322 return 0; 1323 case ARPHRD_ARCNET: 1324 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1325 if (dev->addr_len != ARCNET_ALEN) 1326 return -1; 1327 memset(eui, 0, 7); 1328 eui[7] = *(u8*)dev->dev_addr; 1329 return 0; 1330 case ARPHRD_INFINIBAND: 1331 if (dev->addr_len != INFINIBAND_ALEN) 1332 return -1; 1333 memcpy(eui, dev->dev_addr + 12, 8); 1334 eui[0] |= 2; 1335 return 0; 1336 } 1337 return -1; 1338 } 1339 1340 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1341 { 1342 int err = -1; 1343 struct inet6_ifaddr *ifp; 1344 1345 read_lock_bh(&idev->lock); 1346 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1347 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1348 memcpy(eui, ifp->addr.s6_addr+8, 8); 1349 err = 0; 1350 break; 1351 } 1352 } 1353 read_unlock_bh(&idev->lock); 1354 return err; 1355 } 1356 1357 #ifdef CONFIG_IPV6_PRIVACY 1358 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1359 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1360 { 1361 struct net_device *dev; 1362 struct scatterlist sg[2]; 1363 1364 sg_set_buf(&sg[0], idev->entropy, 8); 1365 sg_set_buf(&sg[1], idev->work_eui64, 8); 1366 1367 dev = idev->dev; 1368 1369 if (ipv6_generate_eui64(idev->work_eui64, dev)) { 1370 printk(KERN_INFO 1371 "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n", 1372 idev); 1373 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64)); 1374 } 1375 regen: 1376 spin_lock(&md5_tfm_lock); 1377 if (unlikely(md5_tfm == NULL)) { 1378 spin_unlock(&md5_tfm_lock); 1379 return -1; 1380 } 1381 crypto_digest_init(md5_tfm); 1382 crypto_digest_update(md5_tfm, sg, 2); 1383 crypto_digest_final(md5_tfm, idev->work_digest); 1384 spin_unlock(&md5_tfm_lock); 1385 1386 memcpy(idev->rndid, &idev->work_digest[0], 8); 1387 idev->rndid[0] &= ~0x02; 1388 memcpy(idev->entropy, &idev->work_digest[8], 8); 1389 1390 /* 1391 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1392 * check if generated address is not inappropriate 1393 * 1394 * - Reserved subnet anycast (RFC 2526) 1395 * 11111101 11....11 1xxxxxxx 1396 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 1397 * 00-00-5E-FE-xx-xx-xx-xx 1398 * - value 0 1399 * - XXX: already assigned to an address on the device 1400 */ 1401 if (idev->rndid[0] == 0xfd && 1402 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1403 (idev->rndid[7]&0x80)) 1404 goto regen; 1405 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1406 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1407 goto regen; 1408 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1409 goto regen; 1410 } 1411 1412 return 0; 1413 } 1414 1415 static void ipv6_regen_rndid(unsigned long data) 1416 { 1417 struct inet6_dev *idev = (struct inet6_dev *) data; 1418 unsigned long expires; 1419 1420 read_lock_bh(&addrconf_lock); 1421 write_lock_bh(&idev->lock); 1422 1423 if (idev->dead) 1424 goto out; 1425 1426 if (__ipv6_regen_rndid(idev) < 0) 1427 goto out; 1428 1429 expires = jiffies + 1430 idev->cnf.temp_prefered_lft * HZ - 1431 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1432 if (time_before(expires, jiffies)) { 1433 printk(KERN_WARNING 1434 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1435 idev->dev->name); 1436 goto out; 1437 } 1438 1439 if (!mod_timer(&idev->regen_timer, expires)) 1440 in6_dev_hold(idev); 1441 1442 out: 1443 write_unlock_bh(&idev->lock); 1444 read_unlock_bh(&addrconf_lock); 1445 in6_dev_put(idev); 1446 } 1447 1448 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1449 int ret = 0; 1450 1451 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1452 ret = __ipv6_regen_rndid(idev); 1453 return ret; 1454 } 1455 #endif 1456 1457 /* 1458 * Add prefix route. 1459 */ 1460 1461 static void 1462 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1463 unsigned long expires, u32 flags) 1464 { 1465 struct in6_rtmsg rtmsg; 1466 1467 memset(&rtmsg, 0, sizeof(rtmsg)); 1468 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx); 1469 rtmsg.rtmsg_dst_len = plen; 1470 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; 1471 rtmsg.rtmsg_ifindex = dev->ifindex; 1472 rtmsg.rtmsg_info = expires; 1473 rtmsg.rtmsg_flags = RTF_UP|flags; 1474 rtmsg.rtmsg_type = RTMSG_NEWROUTE; 1475 1476 /* Prevent useless cloning on PtP SIT. 1477 This thing is done here expecting that the whole 1478 class of non-broadcast devices need not cloning. 1479 */ 1480 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT)) 1481 rtmsg.rtmsg_flags |= RTF_NONEXTHOP; 1482 1483 ip6_route_add(&rtmsg, NULL, NULL, NULL); 1484 } 1485 1486 /* Create "default" multicast route to the interface */ 1487 1488 static void addrconf_add_mroute(struct net_device *dev) 1489 { 1490 struct in6_rtmsg rtmsg; 1491 1492 memset(&rtmsg, 0, sizeof(rtmsg)); 1493 ipv6_addr_set(&rtmsg.rtmsg_dst, 1494 htonl(0xFF000000), 0, 0, 0); 1495 rtmsg.rtmsg_dst_len = 8; 1496 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; 1497 rtmsg.rtmsg_ifindex = dev->ifindex; 1498 rtmsg.rtmsg_flags = RTF_UP; 1499 rtmsg.rtmsg_type = RTMSG_NEWROUTE; 1500 ip6_route_add(&rtmsg, NULL, NULL, NULL); 1501 } 1502 1503 static void sit_route_add(struct net_device *dev) 1504 { 1505 struct in6_rtmsg rtmsg; 1506 1507 memset(&rtmsg, 0, sizeof(rtmsg)); 1508 1509 rtmsg.rtmsg_type = RTMSG_NEWROUTE; 1510 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; 1511 1512 /* prefix length - 96 bits "::d.d.d.d" */ 1513 rtmsg.rtmsg_dst_len = 96; 1514 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP; 1515 rtmsg.rtmsg_ifindex = dev->ifindex; 1516 1517 ip6_route_add(&rtmsg, NULL, NULL, NULL); 1518 } 1519 1520 static void addrconf_add_lroute(struct net_device *dev) 1521 { 1522 struct in6_addr addr; 1523 1524 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1525 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1526 } 1527 1528 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1529 { 1530 struct inet6_dev *idev; 1531 1532 ASSERT_RTNL(); 1533 1534 if ((idev = ipv6_find_idev(dev)) == NULL) 1535 return NULL; 1536 1537 /* Add default multicast route */ 1538 addrconf_add_mroute(dev); 1539 1540 /* Add link local route */ 1541 addrconf_add_lroute(dev); 1542 return idev; 1543 } 1544 1545 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1546 { 1547 struct prefix_info *pinfo; 1548 __u32 valid_lft; 1549 __u32 prefered_lft; 1550 int addr_type; 1551 unsigned long rt_expires; 1552 struct inet6_dev *in6_dev; 1553 1554 pinfo = (struct prefix_info *) opt; 1555 1556 if (len < sizeof(struct prefix_info)) { 1557 ADBG(("addrconf: prefix option too short\n")); 1558 return; 1559 } 1560 1561 /* 1562 * Validation checks ([ADDRCONF], page 19) 1563 */ 1564 1565 addr_type = ipv6_addr_type(&pinfo->prefix); 1566 1567 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1568 return; 1569 1570 valid_lft = ntohl(pinfo->valid); 1571 prefered_lft = ntohl(pinfo->prefered); 1572 1573 if (prefered_lft > valid_lft) { 1574 if (net_ratelimit()) 1575 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1576 return; 1577 } 1578 1579 in6_dev = in6_dev_get(dev); 1580 1581 if (in6_dev == NULL) { 1582 if (net_ratelimit()) 1583 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1584 return; 1585 } 1586 1587 /* 1588 * Two things going on here: 1589 * 1) Add routes for on-link prefixes 1590 * 2) Configure prefixes with the auto flag set 1591 */ 1592 1593 /* Avoid arithmetic overflow. Really, we could 1594 save rt_expires in seconds, likely valid_lft, 1595 but it would require division in fib gc, that it 1596 not good. 1597 */ 1598 if (valid_lft >= 0x7FFFFFFF/HZ) 1599 rt_expires = 0; 1600 else 1601 rt_expires = jiffies + valid_lft * HZ; 1602 1603 if (pinfo->onlink) { 1604 struct rt6_info *rt; 1605 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1606 1607 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1608 if (rt->rt6i_flags&RTF_EXPIRES) { 1609 if (valid_lft == 0) { 1610 ip6_del_rt(rt, NULL, NULL, NULL); 1611 rt = NULL; 1612 } else { 1613 rt->rt6i_expires = rt_expires; 1614 } 1615 } 1616 } else if (valid_lft) { 1617 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1618 dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1619 } 1620 if (rt) 1621 dst_release(&rt->u.dst); 1622 } 1623 1624 /* Try to figure out our local address for this prefix */ 1625 1626 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1627 struct inet6_ifaddr * ifp; 1628 struct in6_addr addr; 1629 int create = 0, update_lft = 0; 1630 1631 if (pinfo->prefix_len == 64) { 1632 memcpy(&addr, &pinfo->prefix, 8); 1633 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1634 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1635 in6_dev_put(in6_dev); 1636 return; 1637 } 1638 goto ok; 1639 } 1640 if (net_ratelimit()) 1641 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1642 pinfo->prefix_len); 1643 in6_dev_put(in6_dev); 1644 return; 1645 1646 ok: 1647 1648 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1649 1650 if (ifp == NULL && valid_lft) { 1651 int max_addresses = in6_dev->cnf.max_addresses; 1652 1653 /* Do not allow to create too much of autoconfigured 1654 * addresses; this would be too easy way to crash kernel. 1655 */ 1656 if (!max_addresses || 1657 ipv6_count_addresses(in6_dev) < max_addresses) 1658 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1659 addr_type&IPV6_ADDR_SCOPE_MASK, 0); 1660 1661 if (!ifp || IS_ERR(ifp)) { 1662 in6_dev_put(in6_dev); 1663 return; 1664 } 1665 1666 update_lft = create = 1; 1667 ifp->cstamp = jiffies; 1668 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1669 } 1670 1671 if (ifp) { 1672 int flags; 1673 unsigned long now; 1674 #ifdef CONFIG_IPV6_PRIVACY 1675 struct inet6_ifaddr *ift; 1676 #endif 1677 u32 stored_lft; 1678 1679 /* update lifetime (RFC2462 5.5.3 e) */ 1680 spin_lock(&ifp->lock); 1681 now = jiffies; 1682 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1683 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1684 else 1685 stored_lft = 0; 1686 if (!update_lft && stored_lft) { 1687 if (valid_lft > MIN_VALID_LIFETIME || 1688 valid_lft > stored_lft) 1689 update_lft = 1; 1690 else if (stored_lft <= MIN_VALID_LIFETIME) { 1691 /* valid_lft <= stored_lft is always true */ 1692 /* XXX: IPsec */ 1693 update_lft = 0; 1694 } else { 1695 valid_lft = MIN_VALID_LIFETIME; 1696 if (valid_lft < prefered_lft) 1697 prefered_lft = valid_lft; 1698 update_lft = 1; 1699 } 1700 } 1701 1702 if (update_lft) { 1703 ifp->valid_lft = valid_lft; 1704 ifp->prefered_lft = prefered_lft; 1705 ifp->tstamp = now; 1706 flags = ifp->flags; 1707 ifp->flags &= ~IFA_F_DEPRECATED; 1708 spin_unlock(&ifp->lock); 1709 1710 if (!(flags&IFA_F_TENTATIVE)) 1711 ipv6_ifa_notify(0, ifp); 1712 } else 1713 spin_unlock(&ifp->lock); 1714 1715 #ifdef CONFIG_IPV6_PRIVACY 1716 read_lock_bh(&in6_dev->lock); 1717 /* update all temporary addresses in the list */ 1718 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1719 /* 1720 * When adjusting the lifetimes of an existing 1721 * temporary address, only lower the lifetimes. 1722 * Implementations must not increase the 1723 * lifetimes of an existing temporary address 1724 * when processing a Prefix Information Option. 1725 */ 1726 spin_lock(&ift->lock); 1727 flags = ift->flags; 1728 if (ift->valid_lft > valid_lft && 1729 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1730 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1731 if (ift->prefered_lft > prefered_lft && 1732 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1733 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1734 spin_unlock(&ift->lock); 1735 if (!(flags&IFA_F_TENTATIVE)) 1736 ipv6_ifa_notify(0, ift); 1737 } 1738 1739 if (create && in6_dev->cnf.use_tempaddr > 0) { 1740 /* 1741 * When a new public address is created as described in [ADDRCONF], 1742 * also create a new temporary address. 1743 */ 1744 read_unlock_bh(&in6_dev->lock); 1745 ipv6_create_tempaddr(ifp, NULL); 1746 } else { 1747 read_unlock_bh(&in6_dev->lock); 1748 } 1749 #endif 1750 in6_ifa_put(ifp); 1751 addrconf_verify(0); 1752 } 1753 } 1754 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1755 in6_dev_put(in6_dev); 1756 } 1757 1758 /* 1759 * Set destination address. 1760 * Special case for SIT interfaces where we create a new "virtual" 1761 * device. 1762 */ 1763 int addrconf_set_dstaddr(void __user *arg) 1764 { 1765 struct in6_ifreq ireq; 1766 struct net_device *dev; 1767 int err = -EINVAL; 1768 1769 rtnl_lock(); 1770 1771 err = -EFAULT; 1772 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1773 goto err_exit; 1774 1775 dev = __dev_get_by_index(ireq.ifr6_ifindex); 1776 1777 err = -ENODEV; 1778 if (dev == NULL) 1779 goto err_exit; 1780 1781 if (dev->type == ARPHRD_SIT) { 1782 struct ifreq ifr; 1783 mm_segment_t oldfs; 1784 struct ip_tunnel_parm p; 1785 1786 err = -EADDRNOTAVAIL; 1787 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1788 goto err_exit; 1789 1790 memset(&p, 0, sizeof(p)); 1791 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1792 p.iph.saddr = 0; 1793 p.iph.version = 4; 1794 p.iph.ihl = 5; 1795 p.iph.protocol = IPPROTO_IPV6; 1796 p.iph.ttl = 64; 1797 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1798 1799 oldfs = get_fs(); set_fs(KERNEL_DS); 1800 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1801 set_fs(oldfs); 1802 1803 if (err == 0) { 1804 err = -ENOBUFS; 1805 if ((dev = __dev_get_by_name(p.name)) == NULL) 1806 goto err_exit; 1807 err = dev_open(dev); 1808 } 1809 } 1810 1811 err_exit: 1812 rtnl_unlock(); 1813 return err; 1814 } 1815 1816 /* 1817 * Manual configuration of address on an interface 1818 */ 1819 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen) 1820 { 1821 struct inet6_ifaddr *ifp; 1822 struct inet6_dev *idev; 1823 struct net_device *dev; 1824 int scope; 1825 1826 ASSERT_RTNL(); 1827 1828 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1829 return -ENODEV; 1830 1831 if (!(dev->flags&IFF_UP)) 1832 return -ENETDOWN; 1833 1834 if ((idev = addrconf_add_dev(dev)) == NULL) 1835 return -ENOBUFS; 1836 1837 scope = ipv6_addr_scope(pfx); 1838 1839 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT); 1840 if (!IS_ERR(ifp)) { 1841 addrconf_dad_start(ifp, 0); 1842 in6_ifa_put(ifp); 1843 return 0; 1844 } 1845 1846 return PTR_ERR(ifp); 1847 } 1848 1849 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1850 { 1851 struct inet6_ifaddr *ifp; 1852 struct inet6_dev *idev; 1853 struct net_device *dev; 1854 1855 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1856 return -ENODEV; 1857 1858 if ((idev = __in6_dev_get(dev)) == NULL) 1859 return -ENXIO; 1860 1861 read_lock_bh(&idev->lock); 1862 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1863 if (ifp->prefix_len == plen && 1864 ipv6_addr_equal(pfx, &ifp->addr)) { 1865 in6_ifa_hold(ifp); 1866 read_unlock_bh(&idev->lock); 1867 1868 ipv6_del_addr(ifp); 1869 1870 /* If the last address is deleted administratively, 1871 disable IPv6 on this interface. 1872 */ 1873 if (idev->addr_list == NULL) 1874 addrconf_ifdown(idev->dev, 1); 1875 return 0; 1876 } 1877 } 1878 read_unlock_bh(&idev->lock); 1879 return -EADDRNOTAVAIL; 1880 } 1881 1882 1883 int addrconf_add_ifaddr(void __user *arg) 1884 { 1885 struct in6_ifreq ireq; 1886 int err; 1887 1888 if (!capable(CAP_NET_ADMIN)) 1889 return -EPERM; 1890 1891 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1892 return -EFAULT; 1893 1894 rtnl_lock(); 1895 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 1896 rtnl_unlock(); 1897 return err; 1898 } 1899 1900 int addrconf_del_ifaddr(void __user *arg) 1901 { 1902 struct in6_ifreq ireq; 1903 int err; 1904 1905 if (!capable(CAP_NET_ADMIN)) 1906 return -EPERM; 1907 1908 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1909 return -EFAULT; 1910 1911 rtnl_lock(); 1912 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 1913 rtnl_unlock(); 1914 return err; 1915 } 1916 1917 static void sit_add_v4_addrs(struct inet6_dev *idev) 1918 { 1919 struct inet6_ifaddr * ifp; 1920 struct in6_addr addr; 1921 struct net_device *dev; 1922 int scope; 1923 1924 ASSERT_RTNL(); 1925 1926 memset(&addr, 0, sizeof(struct in6_addr)); 1927 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 1928 1929 if (idev->dev->flags&IFF_POINTOPOINT) { 1930 addr.s6_addr32[0] = htonl(0xfe800000); 1931 scope = IFA_LINK; 1932 } else { 1933 scope = IPV6_ADDR_COMPATv4; 1934 } 1935 1936 if (addr.s6_addr32[3]) { 1937 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 1938 if (!IS_ERR(ifp)) { 1939 spin_lock_bh(&ifp->lock); 1940 ifp->flags &= ~IFA_F_TENTATIVE; 1941 spin_unlock_bh(&ifp->lock); 1942 ipv6_ifa_notify(RTM_NEWADDR, ifp); 1943 in6_ifa_put(ifp); 1944 } 1945 return; 1946 } 1947 1948 for (dev = dev_base; dev != NULL; dev = dev->next) { 1949 struct in_device * in_dev = __in_dev_get_rtnl(dev); 1950 if (in_dev && (dev->flags & IFF_UP)) { 1951 struct in_ifaddr * ifa; 1952 1953 int flag = scope; 1954 1955 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1956 int plen; 1957 1958 addr.s6_addr32[3] = ifa->ifa_local; 1959 1960 if (ifa->ifa_scope == RT_SCOPE_LINK) 1961 continue; 1962 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 1963 if (idev->dev->flags&IFF_POINTOPOINT) 1964 continue; 1965 flag |= IFA_HOST; 1966 } 1967 if (idev->dev->flags&IFF_POINTOPOINT) 1968 plen = 64; 1969 else 1970 plen = 96; 1971 1972 ifp = ipv6_add_addr(idev, &addr, plen, flag, 1973 IFA_F_PERMANENT); 1974 if (!IS_ERR(ifp)) { 1975 spin_lock_bh(&ifp->lock); 1976 ifp->flags &= ~IFA_F_TENTATIVE; 1977 spin_unlock_bh(&ifp->lock); 1978 ipv6_ifa_notify(RTM_NEWADDR, ifp); 1979 in6_ifa_put(ifp); 1980 } 1981 } 1982 } 1983 } 1984 } 1985 1986 static void init_loopback(struct net_device *dev) 1987 { 1988 struct inet6_dev *idev; 1989 struct inet6_ifaddr * ifp; 1990 1991 /* ::1 */ 1992 1993 ASSERT_RTNL(); 1994 1995 if ((idev = ipv6_find_idev(dev)) == NULL) { 1996 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 1997 return; 1998 } 1999 2000 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2001 if (!IS_ERR(ifp)) { 2002 spin_lock_bh(&ifp->lock); 2003 ifp->flags &= ~IFA_F_TENTATIVE; 2004 spin_unlock_bh(&ifp->lock); 2005 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2006 in6_ifa_put(ifp); 2007 } 2008 } 2009 2010 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2011 { 2012 struct inet6_ifaddr * ifp; 2013 2014 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT); 2015 if (!IS_ERR(ifp)) { 2016 addrconf_dad_start(ifp, 0); 2017 in6_ifa_put(ifp); 2018 } 2019 } 2020 2021 static void addrconf_dev_config(struct net_device *dev) 2022 { 2023 struct in6_addr addr; 2024 struct inet6_dev * idev; 2025 2026 ASSERT_RTNL(); 2027 2028 if ((dev->type != ARPHRD_ETHER) && 2029 (dev->type != ARPHRD_FDDI) && 2030 (dev->type != ARPHRD_IEEE802_TR) && 2031 (dev->type != ARPHRD_ARCNET) && 2032 (dev->type != ARPHRD_INFINIBAND)) { 2033 /* Alas, we support only Ethernet autoconfiguration. */ 2034 return; 2035 } 2036 2037 idev = addrconf_add_dev(dev); 2038 if (idev == NULL) 2039 return; 2040 2041 memset(&addr, 0, sizeof(struct in6_addr)); 2042 addr.s6_addr32[0] = htonl(0xFE800000); 2043 2044 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2045 addrconf_add_linklocal(idev, &addr); 2046 } 2047 2048 static void addrconf_sit_config(struct net_device *dev) 2049 { 2050 struct inet6_dev *idev; 2051 2052 ASSERT_RTNL(); 2053 2054 /* 2055 * Configure the tunnel with one of our IPv4 2056 * addresses... we should configure all of 2057 * our v4 addrs in the tunnel 2058 */ 2059 2060 if ((idev = ipv6_find_idev(dev)) == NULL) { 2061 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2062 return; 2063 } 2064 2065 sit_add_v4_addrs(idev); 2066 2067 if (dev->flags&IFF_POINTOPOINT) { 2068 addrconf_add_mroute(dev); 2069 addrconf_add_lroute(dev); 2070 } else 2071 sit_route_add(dev); 2072 } 2073 2074 static inline int 2075 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2076 { 2077 struct in6_addr lladdr; 2078 2079 if (!ipv6_get_lladdr(link_dev, &lladdr)) { 2080 addrconf_add_linklocal(idev, &lladdr); 2081 return 0; 2082 } 2083 return -1; 2084 } 2085 2086 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2087 { 2088 struct net_device *link_dev; 2089 2090 /* first try to inherit the link-local address from the link device */ 2091 if (idev->dev->iflink && 2092 (link_dev = __dev_get_by_index(idev->dev->iflink))) { 2093 if (!ipv6_inherit_linklocal(idev, link_dev)) 2094 return; 2095 } 2096 /* then try to inherit it from any device */ 2097 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) { 2098 if (!ipv6_inherit_linklocal(idev, link_dev)) 2099 return; 2100 } 2101 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2102 } 2103 2104 /* 2105 * Autoconfigure tunnel with a link-local address so routing protocols, 2106 * DHCPv6, MLD etc. can be run over the virtual link 2107 */ 2108 2109 static void addrconf_ip6_tnl_config(struct net_device *dev) 2110 { 2111 struct inet6_dev *idev; 2112 2113 ASSERT_RTNL(); 2114 2115 if ((idev = addrconf_add_dev(dev)) == NULL) { 2116 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2117 return; 2118 } 2119 ip6_tnl_add_linklocal(idev); 2120 addrconf_add_mroute(dev); 2121 } 2122 2123 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2124 void * data) 2125 { 2126 struct net_device *dev = (struct net_device *) data; 2127 struct inet6_dev *idev = __in6_dev_get(dev); 2128 2129 switch(event) { 2130 case NETDEV_UP: 2131 switch(dev->type) { 2132 case ARPHRD_SIT: 2133 addrconf_sit_config(dev); 2134 break; 2135 case ARPHRD_TUNNEL6: 2136 addrconf_ip6_tnl_config(dev); 2137 break; 2138 case ARPHRD_LOOPBACK: 2139 init_loopback(dev); 2140 break; 2141 2142 default: 2143 addrconf_dev_config(dev); 2144 break; 2145 }; 2146 if (idev) { 2147 /* If the MTU changed during the interface down, when the 2148 interface up, the changed MTU must be reflected in the 2149 idev as well as routers. 2150 */ 2151 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2152 rt6_mtu_change(dev, dev->mtu); 2153 idev->cnf.mtu6 = dev->mtu; 2154 } 2155 idev->tstamp = jiffies; 2156 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2157 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2158 stop IPv6 on this interface. 2159 */ 2160 if (dev->mtu < IPV6_MIN_MTU) 2161 addrconf_ifdown(dev, event != NETDEV_DOWN); 2162 } 2163 break; 2164 2165 case NETDEV_CHANGEMTU: 2166 if ( idev && dev->mtu >= IPV6_MIN_MTU) { 2167 rt6_mtu_change(dev, dev->mtu); 2168 idev->cnf.mtu6 = dev->mtu; 2169 break; 2170 } 2171 2172 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2173 2174 case NETDEV_DOWN: 2175 case NETDEV_UNREGISTER: 2176 /* 2177 * Remove all addresses from this interface. 2178 */ 2179 addrconf_ifdown(dev, event != NETDEV_DOWN); 2180 break; 2181 case NETDEV_CHANGE: 2182 break; 2183 case NETDEV_CHANGENAME: 2184 #ifdef CONFIG_SYSCTL 2185 if (idev) { 2186 addrconf_sysctl_unregister(&idev->cnf); 2187 neigh_sysctl_unregister(idev->nd_parms); 2188 neigh_sysctl_register(dev, idev->nd_parms, 2189 NET_IPV6, NET_IPV6_NEIGH, "ipv6", 2190 &ndisc_ifinfo_sysctl_change, 2191 NULL); 2192 addrconf_sysctl_register(idev, &idev->cnf); 2193 } 2194 #endif 2195 break; 2196 }; 2197 2198 return NOTIFY_OK; 2199 } 2200 2201 /* 2202 * addrconf module should be notified of a device going up 2203 */ 2204 static struct notifier_block ipv6_dev_notf = { 2205 .notifier_call = addrconf_notify, 2206 .priority = 0 2207 }; 2208 2209 static int addrconf_ifdown(struct net_device *dev, int how) 2210 { 2211 struct inet6_dev *idev; 2212 struct inet6_ifaddr *ifa, **bifa; 2213 int i; 2214 2215 ASSERT_RTNL(); 2216 2217 if (dev == &loopback_dev && how == 1) 2218 how = 0; 2219 2220 rt6_ifdown(dev); 2221 neigh_ifdown(&nd_tbl, dev); 2222 2223 idev = __in6_dev_get(dev); 2224 if (idev == NULL) 2225 return -ENODEV; 2226 2227 /* Step 1: remove reference to ipv6 device from parent device. 2228 Do not dev_put! 2229 */ 2230 if (how == 1) { 2231 write_lock_bh(&addrconf_lock); 2232 dev->ip6_ptr = NULL; 2233 idev->dead = 1; 2234 write_unlock_bh(&addrconf_lock); 2235 2236 /* Step 1.5: remove snmp6 entry */ 2237 snmp6_unregister_dev(idev); 2238 2239 } 2240 2241 /* Step 2: clear hash table */ 2242 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2243 bifa = &inet6_addr_lst[i]; 2244 2245 write_lock_bh(&addrconf_hash_lock); 2246 while ((ifa = *bifa) != NULL) { 2247 if (ifa->idev == idev) { 2248 *bifa = ifa->lst_next; 2249 ifa->lst_next = NULL; 2250 addrconf_del_timer(ifa); 2251 in6_ifa_put(ifa); 2252 continue; 2253 } 2254 bifa = &ifa->lst_next; 2255 } 2256 write_unlock_bh(&addrconf_hash_lock); 2257 } 2258 2259 write_lock_bh(&idev->lock); 2260 2261 /* Step 3: clear flags for stateless addrconf */ 2262 if (how != 1) 2263 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD); 2264 2265 /* Step 4: clear address list */ 2266 #ifdef CONFIG_IPV6_PRIVACY 2267 if (how == 1 && del_timer(&idev->regen_timer)) 2268 in6_dev_put(idev); 2269 2270 /* clear tempaddr list */ 2271 while ((ifa = idev->tempaddr_list) != NULL) { 2272 idev->tempaddr_list = ifa->tmp_next; 2273 ifa->tmp_next = NULL; 2274 ifa->dead = 1; 2275 write_unlock_bh(&idev->lock); 2276 spin_lock_bh(&ifa->lock); 2277 2278 if (ifa->ifpub) { 2279 in6_ifa_put(ifa->ifpub); 2280 ifa->ifpub = NULL; 2281 } 2282 spin_unlock_bh(&ifa->lock); 2283 in6_ifa_put(ifa); 2284 write_lock_bh(&idev->lock); 2285 } 2286 #endif 2287 while ((ifa = idev->addr_list) != NULL) { 2288 idev->addr_list = ifa->if_next; 2289 ifa->if_next = NULL; 2290 ifa->dead = 1; 2291 addrconf_del_timer(ifa); 2292 write_unlock_bh(&idev->lock); 2293 2294 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2295 in6_ifa_put(ifa); 2296 2297 write_lock_bh(&idev->lock); 2298 } 2299 write_unlock_bh(&idev->lock); 2300 2301 /* Step 5: Discard multicast list */ 2302 2303 if (how == 1) 2304 ipv6_mc_destroy_dev(idev); 2305 else 2306 ipv6_mc_down(idev); 2307 2308 /* Step 5: netlink notification of this interface */ 2309 idev->tstamp = jiffies; 2310 inet6_ifinfo_notify(RTM_DELLINK, idev); 2311 2312 /* Shot the device (if unregistered) */ 2313 2314 if (how == 1) { 2315 #ifdef CONFIG_SYSCTL 2316 addrconf_sysctl_unregister(&idev->cnf); 2317 neigh_sysctl_unregister(idev->nd_parms); 2318 #endif 2319 neigh_parms_release(&nd_tbl, idev->nd_parms); 2320 neigh_ifdown(&nd_tbl, dev); 2321 in6_dev_put(idev); 2322 } 2323 return 0; 2324 } 2325 2326 static void addrconf_rs_timer(unsigned long data) 2327 { 2328 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2329 2330 if (ifp->idev->cnf.forwarding) 2331 goto out; 2332 2333 if (ifp->idev->if_flags & IF_RA_RCVD) { 2334 /* 2335 * Announcement received after solicitation 2336 * was sent 2337 */ 2338 goto out; 2339 } 2340 2341 spin_lock(&ifp->lock); 2342 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2343 struct in6_addr all_routers; 2344 2345 /* The wait after the last probe can be shorter */ 2346 addrconf_mod_timer(ifp, AC_RS, 2347 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2348 ifp->idev->cnf.rtr_solicit_delay : 2349 ifp->idev->cnf.rtr_solicit_interval); 2350 spin_unlock(&ifp->lock); 2351 2352 ipv6_addr_all_routers(&all_routers); 2353 2354 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2355 } else { 2356 spin_unlock(&ifp->lock); 2357 /* 2358 * Note: we do not support deprecated "all on-link" 2359 * assumption any longer. 2360 */ 2361 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2362 ifp->idev->dev->name); 2363 } 2364 2365 out: 2366 in6_ifa_put(ifp); 2367 } 2368 2369 /* 2370 * Duplicate Address Detection 2371 */ 2372 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2373 { 2374 struct inet6_dev *idev = ifp->idev; 2375 struct net_device *dev = idev->dev; 2376 unsigned long rand_num; 2377 2378 addrconf_join_solict(dev, &ifp->addr); 2379 2380 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT)) 2381 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0, 2382 flags); 2383 2384 net_srandom(ifp->addr.s6_addr32[3]); 2385 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2386 2387 read_lock_bh(&idev->lock); 2388 if (ifp->dead) 2389 goto out; 2390 spin_lock_bh(&ifp->lock); 2391 2392 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2393 !(ifp->flags&IFA_F_TENTATIVE)) { 2394 ifp->flags &= ~IFA_F_TENTATIVE; 2395 spin_unlock_bh(&ifp->lock); 2396 read_unlock_bh(&idev->lock); 2397 2398 addrconf_dad_completed(ifp); 2399 return; 2400 } 2401 2402 ifp->probes = idev->cnf.dad_transmits; 2403 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2404 2405 spin_unlock_bh(&ifp->lock); 2406 out: 2407 read_unlock_bh(&idev->lock); 2408 } 2409 2410 static void addrconf_dad_timer(unsigned long data) 2411 { 2412 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2413 struct inet6_dev *idev = ifp->idev; 2414 struct in6_addr unspec; 2415 struct in6_addr mcaddr; 2416 2417 read_lock_bh(&idev->lock); 2418 if (idev->dead) { 2419 read_unlock_bh(&idev->lock); 2420 goto out; 2421 } 2422 spin_lock_bh(&ifp->lock); 2423 if (ifp->probes == 0) { 2424 /* 2425 * DAD was successful 2426 */ 2427 2428 ifp->flags &= ~IFA_F_TENTATIVE; 2429 spin_unlock_bh(&ifp->lock); 2430 read_unlock_bh(&idev->lock); 2431 2432 addrconf_dad_completed(ifp); 2433 2434 goto out; 2435 } 2436 2437 ifp->probes--; 2438 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2439 spin_unlock_bh(&ifp->lock); 2440 read_unlock_bh(&idev->lock); 2441 2442 /* send a neighbour solicitation for our addr */ 2443 memset(&unspec, 0, sizeof(unspec)); 2444 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2445 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2446 out: 2447 in6_ifa_put(ifp); 2448 } 2449 2450 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2451 { 2452 struct net_device * dev = ifp->idev->dev; 2453 2454 /* 2455 * Configure the address for reception. Now it is valid. 2456 */ 2457 2458 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2459 2460 /* If added prefix is link local and forwarding is off, 2461 start sending router solicitations. 2462 */ 2463 2464 if (ifp->idev->cnf.forwarding == 0 && 2465 ifp->idev->cnf.rtr_solicits > 0 && 2466 (dev->flags&IFF_LOOPBACK) == 0 && 2467 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2468 struct in6_addr all_routers; 2469 2470 ipv6_addr_all_routers(&all_routers); 2471 2472 /* 2473 * If a host as already performed a random delay 2474 * [...] as part of DAD [...] there is no need 2475 * to delay again before sending the first RS 2476 */ 2477 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2478 2479 spin_lock_bh(&ifp->lock); 2480 ifp->probes = 1; 2481 ifp->idev->if_flags |= IF_RS_SENT; 2482 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2483 spin_unlock_bh(&ifp->lock); 2484 } 2485 } 2486 2487 #ifdef CONFIG_PROC_FS 2488 struct if6_iter_state { 2489 int bucket; 2490 }; 2491 2492 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2493 { 2494 struct inet6_ifaddr *ifa = NULL; 2495 struct if6_iter_state *state = seq->private; 2496 2497 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2498 ifa = inet6_addr_lst[state->bucket]; 2499 if (ifa) 2500 break; 2501 } 2502 return ifa; 2503 } 2504 2505 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2506 { 2507 struct if6_iter_state *state = seq->private; 2508 2509 ifa = ifa->lst_next; 2510 try_again: 2511 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2512 ifa = inet6_addr_lst[state->bucket]; 2513 goto try_again; 2514 } 2515 return ifa; 2516 } 2517 2518 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2519 { 2520 struct inet6_ifaddr *ifa = if6_get_first(seq); 2521 2522 if (ifa) 2523 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2524 --pos; 2525 return pos ? NULL : ifa; 2526 } 2527 2528 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2529 { 2530 read_lock_bh(&addrconf_hash_lock); 2531 return if6_get_idx(seq, *pos); 2532 } 2533 2534 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2535 { 2536 struct inet6_ifaddr *ifa; 2537 2538 ifa = if6_get_next(seq, v); 2539 ++*pos; 2540 return ifa; 2541 } 2542 2543 static void if6_seq_stop(struct seq_file *seq, void *v) 2544 { 2545 read_unlock_bh(&addrconf_hash_lock); 2546 } 2547 2548 static int if6_seq_show(struct seq_file *seq, void *v) 2549 { 2550 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2551 seq_printf(seq, 2552 "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n", 2553 NIP6(ifp->addr), 2554 ifp->idev->dev->ifindex, 2555 ifp->prefix_len, 2556 ifp->scope, 2557 ifp->flags, 2558 ifp->idev->dev->name); 2559 return 0; 2560 } 2561 2562 static struct seq_operations if6_seq_ops = { 2563 .start = if6_seq_start, 2564 .next = if6_seq_next, 2565 .show = if6_seq_show, 2566 .stop = if6_seq_stop, 2567 }; 2568 2569 static int if6_seq_open(struct inode *inode, struct file *file) 2570 { 2571 struct seq_file *seq; 2572 int rc = -ENOMEM; 2573 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2574 2575 if (!s) 2576 goto out; 2577 memset(s, 0, sizeof(*s)); 2578 2579 rc = seq_open(file, &if6_seq_ops); 2580 if (rc) 2581 goto out_kfree; 2582 2583 seq = file->private_data; 2584 seq->private = s; 2585 out: 2586 return rc; 2587 out_kfree: 2588 kfree(s); 2589 goto out; 2590 } 2591 2592 static struct file_operations if6_fops = { 2593 .owner = THIS_MODULE, 2594 .open = if6_seq_open, 2595 .read = seq_read, 2596 .llseek = seq_lseek, 2597 .release = seq_release_private, 2598 }; 2599 2600 int __init if6_proc_init(void) 2601 { 2602 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops)) 2603 return -ENOMEM; 2604 return 0; 2605 } 2606 2607 void if6_proc_exit(void) 2608 { 2609 proc_net_remove("if_inet6"); 2610 } 2611 #endif /* CONFIG_PROC_FS */ 2612 2613 /* 2614 * Periodic address status verification 2615 */ 2616 2617 static void addrconf_verify(unsigned long foo) 2618 { 2619 struct inet6_ifaddr *ifp; 2620 unsigned long now, next; 2621 int i; 2622 2623 spin_lock_bh(&addrconf_verify_lock); 2624 now = jiffies; 2625 next = now + ADDR_CHECK_FREQUENCY; 2626 2627 del_timer(&addr_chk_timer); 2628 2629 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2630 2631 restart: 2632 read_lock(&addrconf_hash_lock); 2633 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2634 unsigned long age; 2635 #ifdef CONFIG_IPV6_PRIVACY 2636 unsigned long regen_advance; 2637 #endif 2638 2639 if (ifp->flags & IFA_F_PERMANENT) 2640 continue; 2641 2642 spin_lock(&ifp->lock); 2643 age = (now - ifp->tstamp) / HZ; 2644 2645 #ifdef CONFIG_IPV6_PRIVACY 2646 regen_advance = ifp->idev->cnf.regen_max_retry * 2647 ifp->idev->cnf.dad_transmits * 2648 ifp->idev->nd_parms->retrans_time / HZ; 2649 #endif 2650 2651 if (age >= ifp->valid_lft) { 2652 spin_unlock(&ifp->lock); 2653 in6_ifa_hold(ifp); 2654 read_unlock(&addrconf_hash_lock); 2655 ipv6_del_addr(ifp); 2656 goto restart; 2657 } else if (age >= ifp->prefered_lft) { 2658 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2659 int deprecate = 0; 2660 2661 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2662 deprecate = 1; 2663 ifp->flags |= IFA_F_DEPRECATED; 2664 } 2665 2666 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2667 next = ifp->tstamp + ifp->valid_lft * HZ; 2668 2669 spin_unlock(&ifp->lock); 2670 2671 if (deprecate) { 2672 in6_ifa_hold(ifp); 2673 read_unlock(&addrconf_hash_lock); 2674 2675 ipv6_ifa_notify(0, ifp); 2676 in6_ifa_put(ifp); 2677 goto restart; 2678 } 2679 #ifdef CONFIG_IPV6_PRIVACY 2680 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2681 !(ifp->flags&IFA_F_TENTATIVE)) { 2682 if (age >= ifp->prefered_lft - regen_advance) { 2683 struct inet6_ifaddr *ifpub = ifp->ifpub; 2684 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2685 next = ifp->tstamp + ifp->prefered_lft * HZ; 2686 if (!ifp->regen_count && ifpub) { 2687 ifp->regen_count++; 2688 in6_ifa_hold(ifp); 2689 in6_ifa_hold(ifpub); 2690 spin_unlock(&ifp->lock); 2691 read_unlock(&addrconf_hash_lock); 2692 ipv6_create_tempaddr(ifpub, ifp); 2693 in6_ifa_put(ifpub); 2694 in6_ifa_put(ifp); 2695 goto restart; 2696 } 2697 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2698 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2699 spin_unlock(&ifp->lock); 2700 #endif 2701 } else { 2702 /* ifp->prefered_lft <= ifp->valid_lft */ 2703 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2704 next = ifp->tstamp + ifp->prefered_lft * HZ; 2705 spin_unlock(&ifp->lock); 2706 } 2707 } 2708 read_unlock(&addrconf_hash_lock); 2709 } 2710 2711 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2712 add_timer(&addr_chk_timer); 2713 spin_unlock_bh(&addrconf_verify_lock); 2714 } 2715 2716 static int 2717 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2718 { 2719 struct rtattr **rta = arg; 2720 struct ifaddrmsg *ifm = NLMSG_DATA(nlh); 2721 struct in6_addr *pfx; 2722 2723 pfx = NULL; 2724 if (rta[IFA_ADDRESS-1]) { 2725 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx)) 2726 return -EINVAL; 2727 pfx = RTA_DATA(rta[IFA_ADDRESS-1]); 2728 } 2729 if (rta[IFA_LOCAL-1]) { 2730 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))) 2731 return -EINVAL; 2732 pfx = RTA_DATA(rta[IFA_LOCAL-1]); 2733 } 2734 if (pfx == NULL) 2735 return -EINVAL; 2736 2737 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 2738 } 2739 2740 static int 2741 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2742 { 2743 struct rtattr **rta = arg; 2744 struct ifaddrmsg *ifm = NLMSG_DATA(nlh); 2745 struct in6_addr *pfx; 2746 2747 pfx = NULL; 2748 if (rta[IFA_ADDRESS-1]) { 2749 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx)) 2750 return -EINVAL; 2751 pfx = RTA_DATA(rta[IFA_ADDRESS-1]); 2752 } 2753 if (rta[IFA_LOCAL-1]) { 2754 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))) 2755 return -EINVAL; 2756 pfx = RTA_DATA(rta[IFA_LOCAL-1]); 2757 } 2758 if (pfx == NULL) 2759 return -EINVAL; 2760 2761 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 2762 } 2763 2764 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 2765 u32 pid, u32 seq, int event, unsigned int flags) 2766 { 2767 struct ifaddrmsg *ifm; 2768 struct nlmsghdr *nlh; 2769 struct ifa_cacheinfo ci; 2770 unsigned char *b = skb->tail; 2771 2772 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); 2773 ifm = NLMSG_DATA(nlh); 2774 ifm->ifa_family = AF_INET6; 2775 ifm->ifa_prefixlen = ifa->prefix_len; 2776 ifm->ifa_flags = ifa->flags; 2777 ifm->ifa_scope = RT_SCOPE_UNIVERSE; 2778 if (ifa->scope&IFA_HOST) 2779 ifm->ifa_scope = RT_SCOPE_HOST; 2780 else if (ifa->scope&IFA_LINK) 2781 ifm->ifa_scope = RT_SCOPE_LINK; 2782 else if (ifa->scope&IFA_SITE) 2783 ifm->ifa_scope = RT_SCOPE_SITE; 2784 ifm->ifa_index = ifa->idev->dev->ifindex; 2785 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr); 2786 if (!(ifa->flags&IFA_F_PERMANENT)) { 2787 ci.ifa_prefered = ifa->prefered_lft; 2788 ci.ifa_valid = ifa->valid_lft; 2789 if (ci.ifa_prefered != INFINITY_LIFE_TIME) { 2790 long tval = (jiffies - ifa->tstamp)/HZ; 2791 ci.ifa_prefered -= tval; 2792 if (ci.ifa_valid != INFINITY_LIFE_TIME) 2793 ci.ifa_valid -= tval; 2794 } 2795 } else { 2796 ci.ifa_prefered = INFINITY_LIFE_TIME; 2797 ci.ifa_valid = INFINITY_LIFE_TIME; 2798 } 2799 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100 2800 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 2801 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100 2802 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 2803 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); 2804 nlh->nlmsg_len = skb->tail - b; 2805 return skb->len; 2806 2807 nlmsg_failure: 2808 rtattr_failure: 2809 skb_trim(skb, b - skb->data); 2810 return -1; 2811 } 2812 2813 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 2814 u32 pid, u32 seq, int event, u16 flags) 2815 { 2816 struct ifaddrmsg *ifm; 2817 struct nlmsghdr *nlh; 2818 struct ifa_cacheinfo ci; 2819 unsigned char *b = skb->tail; 2820 2821 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); 2822 ifm = NLMSG_DATA(nlh); 2823 ifm->ifa_family = AF_INET6; 2824 ifm->ifa_prefixlen = 128; 2825 ifm->ifa_flags = IFA_F_PERMANENT; 2826 ifm->ifa_scope = RT_SCOPE_UNIVERSE; 2827 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE) 2828 ifm->ifa_scope = RT_SCOPE_SITE; 2829 ifm->ifa_index = ifmca->idev->dev->ifindex; 2830 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr); 2831 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ 2832 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ 2833 * 100 / HZ); 2834 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ 2835 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ 2836 * 100 / HZ); 2837 ci.ifa_prefered = INFINITY_LIFE_TIME; 2838 ci.ifa_valid = INFINITY_LIFE_TIME; 2839 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); 2840 nlh->nlmsg_len = skb->tail - b; 2841 return skb->len; 2842 2843 nlmsg_failure: 2844 rtattr_failure: 2845 skb_trim(skb, b - skb->data); 2846 return -1; 2847 } 2848 2849 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 2850 u32 pid, u32 seq, int event, unsigned int flags) 2851 { 2852 struct ifaddrmsg *ifm; 2853 struct nlmsghdr *nlh; 2854 struct ifa_cacheinfo ci; 2855 unsigned char *b = skb->tail; 2856 2857 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); 2858 ifm = NLMSG_DATA(nlh); 2859 ifm->ifa_family = AF_INET6; 2860 ifm->ifa_prefixlen = 128; 2861 ifm->ifa_flags = IFA_F_PERMANENT; 2862 ifm->ifa_scope = RT_SCOPE_UNIVERSE; 2863 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE) 2864 ifm->ifa_scope = RT_SCOPE_SITE; 2865 ifm->ifa_index = ifaca->aca_idev->dev->ifindex; 2866 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr); 2867 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ 2868 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ 2869 * 100 / HZ); 2870 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ 2871 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ 2872 * 100 / HZ); 2873 ci.ifa_prefered = INFINITY_LIFE_TIME; 2874 ci.ifa_valid = INFINITY_LIFE_TIME; 2875 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); 2876 nlh->nlmsg_len = skb->tail - b; 2877 return skb->len; 2878 2879 nlmsg_failure: 2880 rtattr_failure: 2881 skb_trim(skb, b - skb->data); 2882 return -1; 2883 } 2884 2885 enum addr_type_t 2886 { 2887 UNICAST_ADDR, 2888 MULTICAST_ADDR, 2889 ANYCAST_ADDR, 2890 }; 2891 2892 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 2893 enum addr_type_t type) 2894 { 2895 int idx, ip_idx; 2896 int s_idx, s_ip_idx; 2897 int err = 1; 2898 struct net_device *dev; 2899 struct inet6_dev *idev = NULL; 2900 struct inet6_ifaddr *ifa; 2901 struct ifmcaddr6 *ifmca; 2902 struct ifacaddr6 *ifaca; 2903 2904 s_idx = cb->args[0]; 2905 s_ip_idx = ip_idx = cb->args[1]; 2906 read_lock(&dev_base_lock); 2907 2908 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { 2909 if (idx < s_idx) 2910 continue; 2911 if (idx > s_idx) 2912 s_ip_idx = 0; 2913 ip_idx = 0; 2914 if ((idev = in6_dev_get(dev)) == NULL) 2915 continue; 2916 read_lock_bh(&idev->lock); 2917 switch (type) { 2918 case UNICAST_ADDR: 2919 /* unicast address incl. temp addr */ 2920 for (ifa = idev->addr_list; ifa; 2921 ifa = ifa->if_next, ip_idx++) { 2922 if (ip_idx < s_ip_idx) 2923 continue; 2924 if ((err = inet6_fill_ifaddr(skb, ifa, 2925 NETLINK_CB(cb->skb).pid, 2926 cb->nlh->nlmsg_seq, RTM_NEWADDR, 2927 NLM_F_MULTI)) <= 0) 2928 goto done; 2929 } 2930 break; 2931 case MULTICAST_ADDR: 2932 /* multicast address */ 2933 for (ifmca = idev->mc_list; ifmca; 2934 ifmca = ifmca->next, ip_idx++) { 2935 if (ip_idx < s_ip_idx) 2936 continue; 2937 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 2938 NETLINK_CB(cb->skb).pid, 2939 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 2940 NLM_F_MULTI)) <= 0) 2941 goto done; 2942 } 2943 break; 2944 case ANYCAST_ADDR: 2945 /* anycast address */ 2946 for (ifaca = idev->ac_list; ifaca; 2947 ifaca = ifaca->aca_next, ip_idx++) { 2948 if (ip_idx < s_ip_idx) 2949 continue; 2950 if ((err = inet6_fill_ifacaddr(skb, ifaca, 2951 NETLINK_CB(cb->skb).pid, 2952 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 2953 NLM_F_MULTI)) <= 0) 2954 goto done; 2955 } 2956 break; 2957 default: 2958 break; 2959 } 2960 read_unlock_bh(&idev->lock); 2961 in6_dev_put(idev); 2962 } 2963 done: 2964 if (err <= 0) { 2965 read_unlock_bh(&idev->lock); 2966 in6_dev_put(idev); 2967 } 2968 read_unlock(&dev_base_lock); 2969 cb->args[0] = idx; 2970 cb->args[1] = ip_idx; 2971 return skb->len; 2972 } 2973 2974 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 2975 { 2976 enum addr_type_t type = UNICAST_ADDR; 2977 return inet6_dump_addr(skb, cb, type); 2978 } 2979 2980 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 2981 { 2982 enum addr_type_t type = MULTICAST_ADDR; 2983 return inet6_dump_addr(skb, cb, type); 2984 } 2985 2986 2987 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 2988 { 2989 enum addr_type_t type = ANYCAST_ADDR; 2990 return inet6_dump_addr(skb, cb, type); 2991 } 2992 2993 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 2994 { 2995 struct sk_buff *skb; 2996 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128); 2997 2998 skb = alloc_skb(size, GFP_ATOMIC); 2999 if (!skb) { 3000 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS); 3001 return; 3002 } 3003 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) { 3004 kfree_skb(skb); 3005 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL); 3006 return; 3007 } 3008 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR; 3009 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC); 3010 } 3011 3012 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf, 3013 __s32 *array, int bytes) 3014 { 3015 memset(array, 0, bytes); 3016 array[DEVCONF_FORWARDING] = cnf->forwarding; 3017 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3018 array[DEVCONF_MTU6] = cnf->mtu6; 3019 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3020 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3021 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3022 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3023 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3024 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3025 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3026 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3027 #ifdef CONFIG_IPV6_PRIVACY 3028 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3029 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3030 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3031 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3032 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3033 #endif 3034 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3035 } 3036 3037 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3038 u32 pid, u32 seq, int event, unsigned int flags) 3039 { 3040 struct net_device *dev = idev->dev; 3041 __s32 *array = NULL; 3042 struct ifinfomsg *r; 3043 struct nlmsghdr *nlh; 3044 unsigned char *b = skb->tail; 3045 struct rtattr *subattr; 3046 __u32 mtu = dev->mtu; 3047 struct ifla_cacheinfo ci; 3048 3049 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); 3050 r = NLMSG_DATA(nlh); 3051 r->ifi_family = AF_INET6; 3052 r->__ifi_pad = 0; 3053 r->ifi_type = dev->type; 3054 r->ifi_index = dev->ifindex; 3055 r->ifi_flags = dev_get_flags(dev); 3056 r->ifi_change = 0; 3057 3058 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); 3059 3060 if (dev->addr_len) 3061 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3062 3063 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); 3064 if (dev->ifindex != dev->iflink) 3065 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink); 3066 3067 subattr = (struct rtattr*)skb->tail; 3068 3069 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL); 3070 3071 /* return the device flags */ 3072 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags); 3073 3074 /* return interface cacheinfo */ 3075 ci.max_reasm_len = IPV6_MAXPLEN; 3076 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3077 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3078 ci.reachable_time = idev->nd_parms->reachable_time; 3079 ci.retrans_time = idev->nd_parms->retrans_time; 3080 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3081 3082 /* return the device sysctl params */ 3083 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL) 3084 goto rtattr_failure; 3085 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array)); 3086 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array); 3087 3088 /* XXX - Statistics/MC not implemented */ 3089 subattr->rta_len = skb->tail - (u8*)subattr; 3090 3091 nlh->nlmsg_len = skb->tail - b; 3092 kfree(array); 3093 return skb->len; 3094 3095 nlmsg_failure: 3096 rtattr_failure: 3097 kfree(array); 3098 skb_trim(skb, b - skb->data); 3099 return -1; 3100 } 3101 3102 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3103 { 3104 int idx, err; 3105 int s_idx = cb->args[0]; 3106 struct net_device *dev; 3107 struct inet6_dev *idev; 3108 3109 read_lock(&dev_base_lock); 3110 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { 3111 if (idx < s_idx) 3112 continue; 3113 if ((idev = in6_dev_get(dev)) == NULL) 3114 continue; 3115 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3116 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3117 in6_dev_put(idev); 3118 if (err <= 0) 3119 break; 3120 } 3121 read_unlock(&dev_base_lock); 3122 cb->args[0] = idx; 3123 3124 return skb->len; 3125 } 3126 3127 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3128 { 3129 struct sk_buff *skb; 3130 /* 128 bytes ?? */ 3131 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128); 3132 3133 skb = alloc_skb(size, GFP_ATOMIC); 3134 if (!skb) { 3135 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS); 3136 return; 3137 } 3138 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) { 3139 kfree_skb(skb); 3140 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL); 3141 return; 3142 } 3143 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO; 3144 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC); 3145 } 3146 3147 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3148 struct prefix_info *pinfo, u32 pid, u32 seq, 3149 int event, unsigned int flags) 3150 { 3151 struct prefixmsg *pmsg; 3152 struct nlmsghdr *nlh; 3153 unsigned char *b = skb->tail; 3154 struct prefix_cacheinfo ci; 3155 3156 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags); 3157 pmsg = NLMSG_DATA(nlh); 3158 pmsg->prefix_family = AF_INET6; 3159 pmsg->prefix_pad1 = 0; 3160 pmsg->prefix_pad2 = 0; 3161 pmsg->prefix_ifindex = idev->dev->ifindex; 3162 pmsg->prefix_len = pinfo->prefix_len; 3163 pmsg->prefix_type = pinfo->type; 3164 pmsg->prefix_pad3 = 0; 3165 3166 pmsg->prefix_flags = 0; 3167 if (pinfo->onlink) 3168 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3169 if (pinfo->autoconf) 3170 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3171 3172 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3173 3174 ci.preferred_time = ntohl(pinfo->prefered); 3175 ci.valid_time = ntohl(pinfo->valid); 3176 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3177 3178 nlh->nlmsg_len = skb->tail - b; 3179 return skb->len; 3180 3181 nlmsg_failure: 3182 rtattr_failure: 3183 skb_trim(skb, b - skb->data); 3184 return -1; 3185 } 3186 3187 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3188 struct prefix_info *pinfo) 3189 { 3190 struct sk_buff *skb; 3191 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128); 3192 3193 skb = alloc_skb(size, GFP_ATOMIC); 3194 if (!skb) { 3195 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS); 3196 return; 3197 } 3198 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) { 3199 kfree_skb(skb); 3200 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL); 3201 return; 3202 } 3203 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX; 3204 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC); 3205 } 3206 3207 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = { 3208 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, }, 3209 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, }, 3210 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, }, 3211 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, }, 3212 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, }, 3213 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, }, 3214 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, }, 3215 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, }, 3216 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute, 3217 .dumpit = inet6_dump_fib, }, 3218 }; 3219 3220 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3221 { 3222 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3223 3224 switch (event) { 3225 case RTM_NEWADDR: 3226 dst_hold(&ifp->rt->u.dst); 3227 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL)) 3228 dst_release(&ifp->rt->u.dst); 3229 if (ifp->idev->cnf.forwarding) 3230 addrconf_join_anycast(ifp); 3231 break; 3232 case RTM_DELADDR: 3233 if (ifp->idev->cnf.forwarding) 3234 addrconf_leave_anycast(ifp); 3235 addrconf_leave_solict(ifp->idev, &ifp->addr); 3236 dst_hold(&ifp->rt->u.dst); 3237 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL)) 3238 dst_free(&ifp->rt->u.dst); 3239 else 3240 dst_release(&ifp->rt->u.dst); 3241 break; 3242 } 3243 } 3244 3245 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3246 { 3247 read_lock_bh(&addrconf_lock); 3248 if (likely(ifp->idev->dead == 0)) 3249 __ipv6_ifa_notify(event, ifp); 3250 read_unlock_bh(&addrconf_lock); 3251 } 3252 3253 #ifdef CONFIG_SYSCTL 3254 3255 static 3256 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3257 void __user *buffer, size_t *lenp, loff_t *ppos) 3258 { 3259 int *valp = ctl->data; 3260 int val = *valp; 3261 int ret; 3262 3263 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3264 3265 if (write && valp != &ipv6_devconf_dflt.forwarding) { 3266 if (valp != &ipv6_devconf.forwarding) { 3267 if ((!*valp) ^ (!val)) { 3268 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 3269 if (idev == NULL) 3270 return ret; 3271 dev_forward_change(idev); 3272 } 3273 } else { 3274 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; 3275 addrconf_forward_change(); 3276 } 3277 if (*valp) 3278 rt6_purge_dflt_routers(); 3279 } 3280 3281 return ret; 3282 } 3283 3284 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3285 int __user *name, int nlen, 3286 void __user *oldval, 3287 size_t __user *oldlenp, 3288 void __user *newval, size_t newlen, 3289 void **context) 3290 { 3291 int *valp = table->data; 3292 int new; 3293 3294 if (!newval || !newlen) 3295 return 0; 3296 if (newlen != sizeof(int)) 3297 return -EINVAL; 3298 if (get_user(new, (int __user *)newval)) 3299 return -EFAULT; 3300 if (new == *valp) 3301 return 0; 3302 if (oldval && oldlenp) { 3303 size_t len; 3304 if (get_user(len, oldlenp)) 3305 return -EFAULT; 3306 if (len) { 3307 if (len > table->maxlen) 3308 len = table->maxlen; 3309 if (copy_to_user(oldval, valp, len)) 3310 return -EFAULT; 3311 if (put_user(len, oldlenp)) 3312 return -EFAULT; 3313 } 3314 } 3315 3316 if (valp != &ipv6_devconf_dflt.forwarding) { 3317 if (valp != &ipv6_devconf.forwarding) { 3318 struct inet6_dev *idev = (struct inet6_dev *)table->extra1; 3319 int changed; 3320 if (unlikely(idev == NULL)) 3321 return -ENODEV; 3322 changed = (!*valp) ^ (!new); 3323 *valp = new; 3324 if (changed) 3325 dev_forward_change(idev); 3326 } else { 3327 *valp = new; 3328 addrconf_forward_change(); 3329 } 3330 3331 if (*valp) 3332 rt6_purge_dflt_routers(); 3333 } else 3334 *valp = new; 3335 3336 return 1; 3337 } 3338 3339 static struct addrconf_sysctl_table 3340 { 3341 struct ctl_table_header *sysctl_header; 3342 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3343 ctl_table addrconf_dev[2]; 3344 ctl_table addrconf_conf_dir[2]; 3345 ctl_table addrconf_proto_dir[2]; 3346 ctl_table addrconf_root_dir[2]; 3347 } addrconf_sysctl = { 3348 .sysctl_header = NULL, 3349 .addrconf_vars = { 3350 { 3351 .ctl_name = NET_IPV6_FORWARDING, 3352 .procname = "forwarding", 3353 .data = &ipv6_devconf.forwarding, 3354 .maxlen = sizeof(int), 3355 .mode = 0644, 3356 .proc_handler = &addrconf_sysctl_forward, 3357 .strategy = &addrconf_sysctl_forward_strategy, 3358 }, 3359 { 3360 .ctl_name = NET_IPV6_HOP_LIMIT, 3361 .procname = "hop_limit", 3362 .data = &ipv6_devconf.hop_limit, 3363 .maxlen = sizeof(int), 3364 .mode = 0644, 3365 .proc_handler = proc_dointvec, 3366 }, 3367 { 3368 .ctl_name = NET_IPV6_MTU, 3369 .procname = "mtu", 3370 .data = &ipv6_devconf.mtu6, 3371 .maxlen = sizeof(int), 3372 .mode = 0644, 3373 .proc_handler = &proc_dointvec, 3374 }, 3375 { 3376 .ctl_name = NET_IPV6_ACCEPT_RA, 3377 .procname = "accept_ra", 3378 .data = &ipv6_devconf.accept_ra, 3379 .maxlen = sizeof(int), 3380 .mode = 0644, 3381 .proc_handler = &proc_dointvec, 3382 }, 3383 { 3384 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3385 .procname = "accept_redirects", 3386 .data = &ipv6_devconf.accept_redirects, 3387 .maxlen = sizeof(int), 3388 .mode = 0644, 3389 .proc_handler = &proc_dointvec, 3390 }, 3391 { 3392 .ctl_name = NET_IPV6_AUTOCONF, 3393 .procname = "autoconf", 3394 .data = &ipv6_devconf.autoconf, 3395 .maxlen = sizeof(int), 3396 .mode = 0644, 3397 .proc_handler = &proc_dointvec, 3398 }, 3399 { 3400 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3401 .procname = "dad_transmits", 3402 .data = &ipv6_devconf.dad_transmits, 3403 .maxlen = sizeof(int), 3404 .mode = 0644, 3405 .proc_handler = &proc_dointvec, 3406 }, 3407 { 3408 .ctl_name = NET_IPV6_RTR_SOLICITS, 3409 .procname = "router_solicitations", 3410 .data = &ipv6_devconf.rtr_solicits, 3411 .maxlen = sizeof(int), 3412 .mode = 0644, 3413 .proc_handler = &proc_dointvec, 3414 }, 3415 { 3416 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3417 .procname = "router_solicitation_interval", 3418 .data = &ipv6_devconf.rtr_solicit_interval, 3419 .maxlen = sizeof(int), 3420 .mode = 0644, 3421 .proc_handler = &proc_dointvec_jiffies, 3422 .strategy = &sysctl_jiffies, 3423 }, 3424 { 3425 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3426 .procname = "router_solicitation_delay", 3427 .data = &ipv6_devconf.rtr_solicit_delay, 3428 .maxlen = sizeof(int), 3429 .mode = 0644, 3430 .proc_handler = &proc_dointvec_jiffies, 3431 .strategy = &sysctl_jiffies, 3432 }, 3433 { 3434 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3435 .procname = "force_mld_version", 3436 .data = &ipv6_devconf.force_mld_version, 3437 .maxlen = sizeof(int), 3438 .mode = 0644, 3439 .proc_handler = &proc_dointvec, 3440 }, 3441 #ifdef CONFIG_IPV6_PRIVACY 3442 { 3443 .ctl_name = NET_IPV6_USE_TEMPADDR, 3444 .procname = "use_tempaddr", 3445 .data = &ipv6_devconf.use_tempaddr, 3446 .maxlen = sizeof(int), 3447 .mode = 0644, 3448 .proc_handler = &proc_dointvec, 3449 }, 3450 { 3451 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3452 .procname = "temp_valid_lft", 3453 .data = &ipv6_devconf.temp_valid_lft, 3454 .maxlen = sizeof(int), 3455 .mode = 0644, 3456 .proc_handler = &proc_dointvec, 3457 }, 3458 { 3459 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3460 .procname = "temp_prefered_lft", 3461 .data = &ipv6_devconf.temp_prefered_lft, 3462 .maxlen = sizeof(int), 3463 .mode = 0644, 3464 .proc_handler = &proc_dointvec, 3465 }, 3466 { 3467 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3468 .procname = "regen_max_retry", 3469 .data = &ipv6_devconf.regen_max_retry, 3470 .maxlen = sizeof(int), 3471 .mode = 0644, 3472 .proc_handler = &proc_dointvec, 3473 }, 3474 { 3475 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3476 .procname = "max_desync_factor", 3477 .data = &ipv6_devconf.max_desync_factor, 3478 .maxlen = sizeof(int), 3479 .mode = 0644, 3480 .proc_handler = &proc_dointvec, 3481 }, 3482 #endif 3483 { 3484 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3485 .procname = "max_addresses", 3486 .data = &ipv6_devconf.max_addresses, 3487 .maxlen = sizeof(int), 3488 .mode = 0644, 3489 .proc_handler = &proc_dointvec, 3490 }, 3491 { 3492 .ctl_name = 0, /* sentinel */ 3493 } 3494 }, 3495 .addrconf_dev = { 3496 { 3497 .ctl_name = NET_PROTO_CONF_ALL, 3498 .procname = "all", 3499 .mode = 0555, 3500 .child = addrconf_sysctl.addrconf_vars, 3501 }, 3502 { 3503 .ctl_name = 0, /* sentinel */ 3504 } 3505 }, 3506 .addrconf_conf_dir = { 3507 { 3508 .ctl_name = NET_IPV6_CONF, 3509 .procname = "conf", 3510 .mode = 0555, 3511 .child = addrconf_sysctl.addrconf_dev, 3512 }, 3513 { 3514 .ctl_name = 0, /* sentinel */ 3515 } 3516 }, 3517 .addrconf_proto_dir = { 3518 { 3519 .ctl_name = NET_IPV6, 3520 .procname = "ipv6", 3521 .mode = 0555, 3522 .child = addrconf_sysctl.addrconf_conf_dir, 3523 }, 3524 { 3525 .ctl_name = 0, /* sentinel */ 3526 } 3527 }, 3528 .addrconf_root_dir = { 3529 { 3530 .ctl_name = CTL_NET, 3531 .procname = "net", 3532 .mode = 0555, 3533 .child = addrconf_sysctl.addrconf_proto_dir, 3534 }, 3535 { 3536 .ctl_name = 0, /* sentinel */ 3537 } 3538 }, 3539 }; 3540 3541 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) 3542 { 3543 int i; 3544 struct net_device *dev = idev ? idev->dev : NULL; 3545 struct addrconf_sysctl_table *t; 3546 char *dev_name = NULL; 3547 3548 t = kmalloc(sizeof(*t), GFP_KERNEL); 3549 if (t == NULL) 3550 return; 3551 memcpy(t, &addrconf_sysctl, sizeof(*t)); 3552 for (i=0; t->addrconf_vars[i].data; i++) { 3553 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 3554 t->addrconf_vars[i].de = NULL; 3555 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 3556 } 3557 if (dev) { 3558 dev_name = dev->name; 3559 t->addrconf_dev[0].ctl_name = dev->ifindex; 3560 } else { 3561 dev_name = "default"; 3562 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 3563 } 3564 3565 /* 3566 * Make a copy of dev_name, because '.procname' is regarded as const 3567 * by sysctl and we wouldn't want anyone to change it under our feet 3568 * (see SIOCSIFNAME). 3569 */ 3570 dev_name = kstrdup(dev_name, GFP_KERNEL); 3571 if (!dev_name) 3572 goto free; 3573 3574 t->addrconf_dev[0].procname = dev_name; 3575 3576 t->addrconf_dev[0].child = t->addrconf_vars; 3577 t->addrconf_dev[0].de = NULL; 3578 t->addrconf_conf_dir[0].child = t->addrconf_dev; 3579 t->addrconf_conf_dir[0].de = NULL; 3580 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; 3581 t->addrconf_proto_dir[0].de = NULL; 3582 t->addrconf_root_dir[0].child = t->addrconf_proto_dir; 3583 t->addrconf_root_dir[0].de = NULL; 3584 3585 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0); 3586 if (t->sysctl_header == NULL) 3587 goto free_procname; 3588 else 3589 p->sysctl = t; 3590 return; 3591 3592 /* error path */ 3593 free_procname: 3594 kfree(dev_name); 3595 free: 3596 kfree(t); 3597 3598 return; 3599 } 3600 3601 static void addrconf_sysctl_unregister(struct ipv6_devconf *p) 3602 { 3603 if (p->sysctl) { 3604 struct addrconf_sysctl_table *t = p->sysctl; 3605 p->sysctl = NULL; 3606 unregister_sysctl_table(t->sysctl_header); 3607 kfree(t->addrconf_dev[0].procname); 3608 kfree(t); 3609 } 3610 } 3611 3612 3613 #endif 3614 3615 /* 3616 * Device notifier 3617 */ 3618 3619 int register_inet6addr_notifier(struct notifier_block *nb) 3620 { 3621 return notifier_chain_register(&inet6addr_chain, nb); 3622 } 3623 3624 int unregister_inet6addr_notifier(struct notifier_block *nb) 3625 { 3626 return notifier_chain_unregister(&inet6addr_chain,nb); 3627 } 3628 3629 /* 3630 * Init / cleanup code 3631 */ 3632 3633 int __init addrconf_init(void) 3634 { 3635 int err = 0; 3636 3637 /* The addrconf netdev notifier requires that loopback_dev 3638 * has it's ipv6 private information allocated and setup 3639 * before it can bring up and give link-local addresses 3640 * to other devices which are up. 3641 * 3642 * Unfortunately, loopback_dev is not necessarily the first 3643 * entry in the global dev_base list of net devices. In fact, 3644 * it is likely to be the very last entry on that list. 3645 * So this causes the notifier registry below to try and 3646 * give link-local addresses to all devices besides loopback_dev 3647 * first, then loopback_dev, which cases all the non-loopback_dev 3648 * devices to fail to get a link-local address. 3649 * 3650 * So, as a temporary fix, allocate the ipv6 structure for 3651 * loopback_dev first by hand. 3652 * Longer term, all of the dependencies ipv6 has upon the loopback 3653 * device and it being up should be removed. 3654 */ 3655 rtnl_lock(); 3656 if (!ipv6_add_dev(&loopback_dev)) 3657 err = -ENOMEM; 3658 rtnl_unlock(); 3659 if (err) 3660 return err; 3661 3662 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev); 3663 3664 register_netdevice_notifier(&ipv6_dev_notf); 3665 3666 #ifdef CONFIG_IPV6_PRIVACY 3667 md5_tfm = crypto_alloc_tfm("md5", 0); 3668 if (unlikely(md5_tfm == NULL)) 3669 printk(KERN_WARNING 3670 "failed to load transform for md5\n"); 3671 #endif 3672 3673 addrconf_verify(0); 3674 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table; 3675 #ifdef CONFIG_SYSCTL 3676 addrconf_sysctl.sysctl_header = 3677 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0); 3678 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); 3679 #endif 3680 3681 return 0; 3682 } 3683 3684 void __exit addrconf_cleanup(void) 3685 { 3686 struct net_device *dev; 3687 struct inet6_dev *idev; 3688 struct inet6_ifaddr *ifa; 3689 int i; 3690 3691 unregister_netdevice_notifier(&ipv6_dev_notf); 3692 3693 rtnetlink_links[PF_INET6] = NULL; 3694 #ifdef CONFIG_SYSCTL 3695 addrconf_sysctl_unregister(&ipv6_devconf_dflt); 3696 addrconf_sysctl_unregister(&ipv6_devconf); 3697 #endif 3698 3699 rtnl_lock(); 3700 3701 /* 3702 * clean dev list. 3703 */ 3704 3705 for (dev=dev_base; dev; dev=dev->next) { 3706 if ((idev = __in6_dev_get(dev)) == NULL) 3707 continue; 3708 addrconf_ifdown(dev, 1); 3709 } 3710 addrconf_ifdown(&loopback_dev, 2); 3711 3712 /* 3713 * Check hash table. 3714 */ 3715 3716 write_lock_bh(&addrconf_hash_lock); 3717 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3718 for (ifa=inet6_addr_lst[i]; ifa; ) { 3719 struct inet6_ifaddr *bifa; 3720 3721 bifa = ifa; 3722 ifa = ifa->lst_next; 3723 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 3724 /* Do not free it; something is wrong. 3725 Now we can investigate it with debugger. 3726 */ 3727 } 3728 } 3729 write_unlock_bh(&addrconf_hash_lock); 3730 3731 del_timer(&addr_chk_timer); 3732 3733 rtnl_unlock(); 3734 3735 #ifdef CONFIG_IPV6_PRIVACY 3736 crypto_free_tfm(md5_tfm); 3737 md5_tfm = NULL; 3738 #endif 3739 3740 #ifdef CONFIG_PROC_FS 3741 proc_net_remove("if_inet6"); 3742 #endif 3743 } 3744