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 "Disabled Privacy Extensions on device %p(%s)\n", 383 dev, 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 */ 988 989 /* Rule 5: Prefer outgoing interface */ 990 if (hiscore.rule < 5) { 991 if (daddr_dev == NULL || 992 daddr_dev == ifa_result->idev->dev) 993 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 994 hiscore.rule++; 995 } 996 if (daddr_dev == NULL || 997 daddr_dev == ifa->idev->dev) { 998 score.attrs |= IPV6_SADDR_SCORE_OIF; 999 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1000 score.rule = 5; 1001 goto record_it; 1002 } 1003 } else { 1004 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1005 continue; 1006 } 1007 1008 /* Rule 6: Prefer matching label */ 1009 if (hiscore.rule < 6) { 1010 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) 1011 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1012 hiscore.rule++; 1013 } 1014 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { 1015 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1016 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1017 score.rule = 6; 1018 goto record_it; 1019 } 1020 } else { 1021 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1022 continue; 1023 } 1024 1025 #ifdef CONFIG_IPV6_PRIVACY 1026 /* Rule 7: Prefer public address 1027 * Note: prefer temprary address if use_tempaddr >= 2 1028 */ 1029 if (hiscore.rule < 7) { 1030 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1031 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1032 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1033 hiscore.rule++; 1034 } 1035 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1036 (ifa->idev->cnf.use_tempaddr >= 2)) { 1037 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1038 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1039 score.rule = 7; 1040 goto record_it; 1041 } 1042 } else { 1043 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1044 continue; 1045 } 1046 #endif 1047 /* Rule 8: Use longest matching prefix */ 1048 if (hiscore.rule < 8) 1049 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1050 score.rule++; 1051 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1052 if (score.matchlen > hiscore.matchlen) { 1053 score.rule = 8; 1054 goto record_it; 1055 } 1056 #if 0 1057 else if (score.matchlen < hiscore.matchlen) 1058 continue; 1059 #endif 1060 1061 /* Final Rule: choose first available one */ 1062 continue; 1063 record_it: 1064 if (ifa_result) 1065 in6_ifa_put(ifa_result); 1066 in6_ifa_hold(ifa); 1067 ifa_result = ifa; 1068 hiscore = score; 1069 } 1070 read_unlock_bh(&idev->lock); 1071 } 1072 read_unlock(&addrconf_lock); 1073 read_unlock(&dev_base_lock); 1074 1075 if (!ifa_result) 1076 return -EADDRNOTAVAIL; 1077 1078 ipv6_addr_copy(saddr, &ifa_result->addr); 1079 in6_ifa_put(ifa_result); 1080 return 0; 1081 } 1082 1083 1084 int ipv6_get_saddr(struct dst_entry *dst, 1085 struct in6_addr *daddr, struct in6_addr *saddr) 1086 { 1087 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr); 1088 } 1089 1090 1091 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr) 1092 { 1093 struct inet6_dev *idev; 1094 int err = -EADDRNOTAVAIL; 1095 1096 read_lock(&addrconf_lock); 1097 if ((idev = __in6_dev_get(dev)) != NULL) { 1098 struct inet6_ifaddr *ifp; 1099 1100 read_lock_bh(&idev->lock); 1101 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1102 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1103 ipv6_addr_copy(addr, &ifp->addr); 1104 err = 0; 1105 break; 1106 } 1107 } 1108 read_unlock_bh(&idev->lock); 1109 } 1110 read_unlock(&addrconf_lock); 1111 return err; 1112 } 1113 1114 static int ipv6_count_addresses(struct inet6_dev *idev) 1115 { 1116 int cnt = 0; 1117 struct inet6_ifaddr *ifp; 1118 1119 read_lock_bh(&idev->lock); 1120 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1121 cnt++; 1122 read_unlock_bh(&idev->lock); 1123 return cnt; 1124 } 1125 1126 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1127 { 1128 struct inet6_ifaddr * ifp; 1129 u8 hash = ipv6_addr_hash(addr); 1130 1131 read_lock_bh(&addrconf_hash_lock); 1132 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1133 if (ipv6_addr_equal(&ifp->addr, addr) && 1134 !(ifp->flags&IFA_F_TENTATIVE)) { 1135 if (dev == NULL || ifp->idev->dev == dev || 1136 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1137 break; 1138 } 1139 } 1140 read_unlock_bh(&addrconf_hash_lock); 1141 return ifp != NULL; 1142 } 1143 1144 static 1145 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1146 { 1147 struct inet6_ifaddr * ifp; 1148 u8 hash = ipv6_addr_hash(addr); 1149 1150 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1151 if (ipv6_addr_equal(&ifp->addr, addr)) { 1152 if (dev == NULL || ifp->idev->dev == dev) 1153 break; 1154 } 1155 } 1156 return ifp != NULL; 1157 } 1158 1159 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1160 { 1161 struct inet6_ifaddr * ifp; 1162 u8 hash = ipv6_addr_hash(addr); 1163 1164 read_lock_bh(&addrconf_hash_lock); 1165 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1166 if (ipv6_addr_equal(&ifp->addr, addr)) { 1167 if (dev == NULL || ifp->idev->dev == dev || 1168 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1169 in6_ifa_hold(ifp); 1170 break; 1171 } 1172 } 1173 } 1174 read_unlock_bh(&addrconf_hash_lock); 1175 1176 return ifp; 1177 } 1178 1179 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1180 { 1181 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1182 const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2); 1183 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1184 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1185 int sk_ipv6only = ipv6_only_sock(sk); 1186 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1187 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1188 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1189 1190 if (!sk2_rcv_saddr && !sk_ipv6only) 1191 return 1; 1192 1193 if (addr_type2 == IPV6_ADDR_ANY && 1194 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1195 return 1; 1196 1197 if (addr_type == IPV6_ADDR_ANY && 1198 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1199 return 1; 1200 1201 if (sk2_rcv_saddr6 && 1202 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1203 return 1; 1204 1205 if (addr_type == IPV6_ADDR_MAPPED && 1206 !sk2_ipv6only && 1207 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1208 return 1; 1209 1210 return 0; 1211 } 1212 1213 /* Gets referenced address, destroys ifaddr */ 1214 1215 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1216 { 1217 if (net_ratelimit()) 1218 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1219 if (ifp->flags&IFA_F_PERMANENT) { 1220 spin_lock_bh(&ifp->lock); 1221 addrconf_del_timer(ifp); 1222 ifp->flags |= IFA_F_TENTATIVE; 1223 spin_unlock_bh(&ifp->lock); 1224 in6_ifa_put(ifp); 1225 #ifdef CONFIG_IPV6_PRIVACY 1226 } else if (ifp->flags&IFA_F_TEMPORARY) { 1227 struct inet6_ifaddr *ifpub; 1228 spin_lock_bh(&ifp->lock); 1229 ifpub = ifp->ifpub; 1230 if (ifpub) { 1231 in6_ifa_hold(ifpub); 1232 spin_unlock_bh(&ifp->lock); 1233 ipv6_create_tempaddr(ifpub, ifp); 1234 in6_ifa_put(ifpub); 1235 } else { 1236 spin_unlock_bh(&ifp->lock); 1237 } 1238 ipv6_del_addr(ifp); 1239 #endif 1240 } else 1241 ipv6_del_addr(ifp); 1242 } 1243 1244 1245 /* Join to solicited addr multicast group. */ 1246 1247 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1248 { 1249 struct in6_addr maddr; 1250 1251 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1252 return; 1253 1254 addrconf_addr_solict_mult(addr, &maddr); 1255 ipv6_dev_mc_inc(dev, &maddr); 1256 } 1257 1258 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1259 { 1260 struct in6_addr maddr; 1261 1262 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1263 return; 1264 1265 addrconf_addr_solict_mult(addr, &maddr); 1266 __ipv6_dev_mc_dec(idev, &maddr); 1267 } 1268 1269 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1270 { 1271 struct in6_addr addr; 1272 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1273 if (ipv6_addr_any(&addr)) 1274 return; 1275 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1276 } 1277 1278 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1279 { 1280 struct in6_addr addr; 1281 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1282 if (ipv6_addr_any(&addr)) 1283 return; 1284 __ipv6_dev_ac_dec(ifp->idev, &addr); 1285 } 1286 1287 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1288 { 1289 switch (dev->type) { 1290 case ARPHRD_ETHER: 1291 case ARPHRD_FDDI: 1292 case ARPHRD_IEEE802_TR: 1293 if (dev->addr_len != ETH_ALEN) 1294 return -1; 1295 memcpy(eui, dev->dev_addr, 3); 1296 memcpy(eui + 5, dev->dev_addr + 3, 3); 1297 1298 /* 1299 * The zSeries OSA network cards can be shared among various 1300 * OS instances, but the OSA cards have only one MAC address. 1301 * This leads to duplicate address conflicts in conjunction 1302 * with IPv6 if more than one instance uses the same card. 1303 * 1304 * The driver for these cards can deliver a unique 16-bit 1305 * identifier for each instance sharing the same card. It is 1306 * placed instead of 0xFFFE in the interface identifier. The 1307 * "u" bit of the interface identifier is not inverted in this 1308 * case. Hence the resulting interface identifier has local 1309 * scope according to RFC2373. 1310 */ 1311 if (dev->dev_id) { 1312 eui[3] = (dev->dev_id >> 8) & 0xFF; 1313 eui[4] = dev->dev_id & 0xFF; 1314 } else { 1315 eui[3] = 0xFF; 1316 eui[4] = 0xFE; 1317 eui[0] ^= 2; 1318 } 1319 return 0; 1320 case ARPHRD_ARCNET: 1321 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1322 if (dev->addr_len != ARCNET_ALEN) 1323 return -1; 1324 memset(eui, 0, 7); 1325 eui[7] = *(u8*)dev->dev_addr; 1326 return 0; 1327 case ARPHRD_INFINIBAND: 1328 if (dev->addr_len != INFINIBAND_ALEN) 1329 return -1; 1330 memcpy(eui, dev->dev_addr + 12, 8); 1331 eui[0] |= 2; 1332 return 0; 1333 } 1334 return -1; 1335 } 1336 1337 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1338 { 1339 int err = -1; 1340 struct inet6_ifaddr *ifp; 1341 1342 read_lock_bh(&idev->lock); 1343 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1344 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1345 memcpy(eui, ifp->addr.s6_addr+8, 8); 1346 err = 0; 1347 break; 1348 } 1349 } 1350 read_unlock_bh(&idev->lock); 1351 return err; 1352 } 1353 1354 #ifdef CONFIG_IPV6_PRIVACY 1355 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1356 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1357 { 1358 struct net_device *dev; 1359 struct scatterlist sg[2]; 1360 1361 sg_set_buf(&sg[0], idev->entropy, 8); 1362 sg_set_buf(&sg[1], idev->work_eui64, 8); 1363 1364 dev = idev->dev; 1365 1366 if (ipv6_generate_eui64(idev->work_eui64, dev)) { 1367 printk(KERN_INFO 1368 "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n", 1369 idev); 1370 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64)); 1371 } 1372 regen: 1373 spin_lock(&md5_tfm_lock); 1374 if (unlikely(md5_tfm == NULL)) { 1375 spin_unlock(&md5_tfm_lock); 1376 return -1; 1377 } 1378 crypto_digest_init(md5_tfm); 1379 crypto_digest_update(md5_tfm, sg, 2); 1380 crypto_digest_final(md5_tfm, idev->work_digest); 1381 spin_unlock(&md5_tfm_lock); 1382 1383 memcpy(idev->rndid, &idev->work_digest[0], 8); 1384 idev->rndid[0] &= ~0x02; 1385 memcpy(idev->entropy, &idev->work_digest[8], 8); 1386 1387 /* 1388 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1389 * check if generated address is not inappropriate 1390 * 1391 * - Reserved subnet anycast (RFC 2526) 1392 * 11111101 11....11 1xxxxxxx 1393 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 1394 * 00-00-5E-FE-xx-xx-xx-xx 1395 * - value 0 1396 * - XXX: already assigned to an address on the device 1397 */ 1398 if (idev->rndid[0] == 0xfd && 1399 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1400 (idev->rndid[7]&0x80)) 1401 goto regen; 1402 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1403 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1404 goto regen; 1405 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1406 goto regen; 1407 } 1408 1409 return 0; 1410 } 1411 1412 static void ipv6_regen_rndid(unsigned long data) 1413 { 1414 struct inet6_dev *idev = (struct inet6_dev *) data; 1415 unsigned long expires; 1416 1417 read_lock_bh(&addrconf_lock); 1418 write_lock_bh(&idev->lock); 1419 1420 if (idev->dead) 1421 goto out; 1422 1423 if (__ipv6_regen_rndid(idev) < 0) 1424 goto out; 1425 1426 expires = jiffies + 1427 idev->cnf.temp_prefered_lft * HZ - 1428 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1429 if (time_before(expires, jiffies)) { 1430 printk(KERN_WARNING 1431 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1432 idev->dev->name); 1433 goto out; 1434 } 1435 1436 if (!mod_timer(&idev->regen_timer, expires)) 1437 in6_dev_hold(idev); 1438 1439 out: 1440 write_unlock_bh(&idev->lock); 1441 read_unlock_bh(&addrconf_lock); 1442 in6_dev_put(idev); 1443 } 1444 1445 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1446 int ret = 0; 1447 1448 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1449 ret = __ipv6_regen_rndid(idev); 1450 return ret; 1451 } 1452 #endif 1453 1454 /* 1455 * Add prefix route. 1456 */ 1457 1458 static void 1459 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1460 unsigned long expires, u32 flags) 1461 { 1462 struct in6_rtmsg rtmsg; 1463 1464 memset(&rtmsg, 0, sizeof(rtmsg)); 1465 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx); 1466 rtmsg.rtmsg_dst_len = plen; 1467 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; 1468 rtmsg.rtmsg_ifindex = dev->ifindex; 1469 rtmsg.rtmsg_info = expires; 1470 rtmsg.rtmsg_flags = RTF_UP|flags; 1471 rtmsg.rtmsg_type = RTMSG_NEWROUTE; 1472 1473 /* Prevent useless cloning on PtP SIT. 1474 This thing is done here expecting that the whole 1475 class of non-broadcast devices need not cloning. 1476 */ 1477 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT)) 1478 rtmsg.rtmsg_flags |= RTF_NONEXTHOP; 1479 1480 ip6_route_add(&rtmsg, NULL, NULL, NULL); 1481 } 1482 1483 /* Create "default" multicast route to the interface */ 1484 1485 static void addrconf_add_mroute(struct net_device *dev) 1486 { 1487 struct in6_rtmsg rtmsg; 1488 1489 memset(&rtmsg, 0, sizeof(rtmsg)); 1490 ipv6_addr_set(&rtmsg.rtmsg_dst, 1491 htonl(0xFF000000), 0, 0, 0); 1492 rtmsg.rtmsg_dst_len = 8; 1493 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; 1494 rtmsg.rtmsg_ifindex = dev->ifindex; 1495 rtmsg.rtmsg_flags = RTF_UP; 1496 rtmsg.rtmsg_type = RTMSG_NEWROUTE; 1497 ip6_route_add(&rtmsg, NULL, NULL, NULL); 1498 } 1499 1500 static void sit_route_add(struct net_device *dev) 1501 { 1502 struct in6_rtmsg rtmsg; 1503 1504 memset(&rtmsg, 0, sizeof(rtmsg)); 1505 1506 rtmsg.rtmsg_type = RTMSG_NEWROUTE; 1507 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; 1508 1509 /* prefix length - 96 bits "::d.d.d.d" */ 1510 rtmsg.rtmsg_dst_len = 96; 1511 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP; 1512 rtmsg.rtmsg_ifindex = dev->ifindex; 1513 1514 ip6_route_add(&rtmsg, NULL, NULL, NULL); 1515 } 1516 1517 static void addrconf_add_lroute(struct net_device *dev) 1518 { 1519 struct in6_addr addr; 1520 1521 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1522 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1523 } 1524 1525 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1526 { 1527 struct inet6_dev *idev; 1528 1529 ASSERT_RTNL(); 1530 1531 if ((idev = ipv6_find_idev(dev)) == NULL) 1532 return NULL; 1533 1534 /* Add default multicast route */ 1535 addrconf_add_mroute(dev); 1536 1537 /* Add link local route */ 1538 addrconf_add_lroute(dev); 1539 return idev; 1540 } 1541 1542 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1543 { 1544 struct prefix_info *pinfo; 1545 __u32 valid_lft; 1546 __u32 prefered_lft; 1547 int addr_type; 1548 unsigned long rt_expires; 1549 struct inet6_dev *in6_dev; 1550 1551 pinfo = (struct prefix_info *) opt; 1552 1553 if (len < sizeof(struct prefix_info)) { 1554 ADBG(("addrconf: prefix option too short\n")); 1555 return; 1556 } 1557 1558 /* 1559 * Validation checks ([ADDRCONF], page 19) 1560 */ 1561 1562 addr_type = ipv6_addr_type(&pinfo->prefix); 1563 1564 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1565 return; 1566 1567 valid_lft = ntohl(pinfo->valid); 1568 prefered_lft = ntohl(pinfo->prefered); 1569 1570 if (prefered_lft > valid_lft) { 1571 if (net_ratelimit()) 1572 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1573 return; 1574 } 1575 1576 in6_dev = in6_dev_get(dev); 1577 1578 if (in6_dev == NULL) { 1579 if (net_ratelimit()) 1580 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1581 return; 1582 } 1583 1584 /* 1585 * Two things going on here: 1586 * 1) Add routes for on-link prefixes 1587 * 2) Configure prefixes with the auto flag set 1588 */ 1589 1590 /* Avoid arithmetic overflow. Really, we could 1591 save rt_expires in seconds, likely valid_lft, 1592 but it would require division in fib gc, that it 1593 not good. 1594 */ 1595 if (valid_lft >= 0x7FFFFFFF/HZ) 1596 rt_expires = 0; 1597 else 1598 rt_expires = jiffies + valid_lft * HZ; 1599 1600 if (pinfo->onlink) { 1601 struct rt6_info *rt; 1602 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1603 1604 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1605 if (rt->rt6i_flags&RTF_EXPIRES) { 1606 if (valid_lft == 0) { 1607 ip6_del_rt(rt, NULL, NULL, NULL); 1608 rt = NULL; 1609 } else { 1610 rt->rt6i_expires = rt_expires; 1611 } 1612 } 1613 } else if (valid_lft) { 1614 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1615 dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1616 } 1617 if (rt) 1618 dst_release(&rt->u.dst); 1619 } 1620 1621 /* Try to figure out our local address for this prefix */ 1622 1623 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1624 struct inet6_ifaddr * ifp; 1625 struct in6_addr addr; 1626 int create = 0, update_lft = 0; 1627 1628 if (pinfo->prefix_len == 64) { 1629 memcpy(&addr, &pinfo->prefix, 8); 1630 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1631 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1632 in6_dev_put(in6_dev); 1633 return; 1634 } 1635 goto ok; 1636 } 1637 if (net_ratelimit()) 1638 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1639 pinfo->prefix_len); 1640 in6_dev_put(in6_dev); 1641 return; 1642 1643 ok: 1644 1645 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1646 1647 if (ifp == NULL && valid_lft) { 1648 int max_addresses = in6_dev->cnf.max_addresses; 1649 1650 /* Do not allow to create too much of autoconfigured 1651 * addresses; this would be too easy way to crash kernel. 1652 */ 1653 if (!max_addresses || 1654 ipv6_count_addresses(in6_dev) < max_addresses) 1655 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1656 addr_type&IPV6_ADDR_SCOPE_MASK, 0); 1657 1658 if (!ifp || IS_ERR(ifp)) { 1659 in6_dev_put(in6_dev); 1660 return; 1661 } 1662 1663 update_lft = create = 1; 1664 ifp->cstamp = jiffies; 1665 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1666 } 1667 1668 if (ifp) { 1669 int flags; 1670 unsigned long now; 1671 #ifdef CONFIG_IPV6_PRIVACY 1672 struct inet6_ifaddr *ift; 1673 #endif 1674 u32 stored_lft; 1675 1676 /* update lifetime (RFC2462 5.5.3 e) */ 1677 spin_lock(&ifp->lock); 1678 now = jiffies; 1679 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1680 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1681 else 1682 stored_lft = 0; 1683 if (!update_lft && stored_lft) { 1684 if (valid_lft > MIN_VALID_LIFETIME || 1685 valid_lft > stored_lft) 1686 update_lft = 1; 1687 else if (stored_lft <= MIN_VALID_LIFETIME) { 1688 /* valid_lft <= stored_lft is always true */ 1689 /* XXX: IPsec */ 1690 update_lft = 0; 1691 } else { 1692 valid_lft = MIN_VALID_LIFETIME; 1693 if (valid_lft < prefered_lft) 1694 prefered_lft = valid_lft; 1695 update_lft = 1; 1696 } 1697 } 1698 1699 if (update_lft) { 1700 ifp->valid_lft = valid_lft; 1701 ifp->prefered_lft = prefered_lft; 1702 ifp->tstamp = now; 1703 flags = ifp->flags; 1704 ifp->flags &= ~IFA_F_DEPRECATED; 1705 spin_unlock(&ifp->lock); 1706 1707 if (!(flags&IFA_F_TENTATIVE)) 1708 ipv6_ifa_notify(0, ifp); 1709 } else 1710 spin_unlock(&ifp->lock); 1711 1712 #ifdef CONFIG_IPV6_PRIVACY 1713 read_lock_bh(&in6_dev->lock); 1714 /* update all temporary addresses in the list */ 1715 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1716 /* 1717 * When adjusting the lifetimes of an existing 1718 * temporary address, only lower the lifetimes. 1719 * Implementations must not increase the 1720 * lifetimes of an existing temporary address 1721 * when processing a Prefix Information Option. 1722 */ 1723 spin_lock(&ift->lock); 1724 flags = ift->flags; 1725 if (ift->valid_lft > valid_lft && 1726 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1727 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1728 if (ift->prefered_lft > prefered_lft && 1729 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1730 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1731 spin_unlock(&ift->lock); 1732 if (!(flags&IFA_F_TENTATIVE)) 1733 ipv6_ifa_notify(0, ift); 1734 } 1735 1736 if (create && in6_dev->cnf.use_tempaddr > 0) { 1737 /* 1738 * When a new public address is created as described in [ADDRCONF], 1739 * also create a new temporary address. 1740 */ 1741 read_unlock_bh(&in6_dev->lock); 1742 ipv6_create_tempaddr(ifp, NULL); 1743 } else { 1744 read_unlock_bh(&in6_dev->lock); 1745 } 1746 #endif 1747 in6_ifa_put(ifp); 1748 addrconf_verify(0); 1749 } 1750 } 1751 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1752 in6_dev_put(in6_dev); 1753 } 1754 1755 /* 1756 * Set destination address. 1757 * Special case for SIT interfaces where we create a new "virtual" 1758 * device. 1759 */ 1760 int addrconf_set_dstaddr(void __user *arg) 1761 { 1762 struct in6_ifreq ireq; 1763 struct net_device *dev; 1764 int err = -EINVAL; 1765 1766 rtnl_lock(); 1767 1768 err = -EFAULT; 1769 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1770 goto err_exit; 1771 1772 dev = __dev_get_by_index(ireq.ifr6_ifindex); 1773 1774 err = -ENODEV; 1775 if (dev == NULL) 1776 goto err_exit; 1777 1778 if (dev->type == ARPHRD_SIT) { 1779 struct ifreq ifr; 1780 mm_segment_t oldfs; 1781 struct ip_tunnel_parm p; 1782 1783 err = -EADDRNOTAVAIL; 1784 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1785 goto err_exit; 1786 1787 memset(&p, 0, sizeof(p)); 1788 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1789 p.iph.saddr = 0; 1790 p.iph.version = 4; 1791 p.iph.ihl = 5; 1792 p.iph.protocol = IPPROTO_IPV6; 1793 p.iph.ttl = 64; 1794 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1795 1796 oldfs = get_fs(); set_fs(KERNEL_DS); 1797 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1798 set_fs(oldfs); 1799 1800 if (err == 0) { 1801 err = -ENOBUFS; 1802 if ((dev = __dev_get_by_name(p.name)) == NULL) 1803 goto err_exit; 1804 err = dev_open(dev); 1805 } 1806 } 1807 1808 err_exit: 1809 rtnl_unlock(); 1810 return err; 1811 } 1812 1813 /* 1814 * Manual configuration of address on an interface 1815 */ 1816 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen) 1817 { 1818 struct inet6_ifaddr *ifp; 1819 struct inet6_dev *idev; 1820 struct net_device *dev; 1821 int scope; 1822 1823 ASSERT_RTNL(); 1824 1825 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1826 return -ENODEV; 1827 1828 if (!(dev->flags&IFF_UP)) 1829 return -ENETDOWN; 1830 1831 if ((idev = addrconf_add_dev(dev)) == NULL) 1832 return -ENOBUFS; 1833 1834 scope = ipv6_addr_scope(pfx); 1835 1836 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT); 1837 if (!IS_ERR(ifp)) { 1838 addrconf_dad_start(ifp, 0); 1839 in6_ifa_put(ifp); 1840 return 0; 1841 } 1842 1843 return PTR_ERR(ifp); 1844 } 1845 1846 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1847 { 1848 struct inet6_ifaddr *ifp; 1849 struct inet6_dev *idev; 1850 struct net_device *dev; 1851 1852 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1853 return -ENODEV; 1854 1855 if ((idev = __in6_dev_get(dev)) == NULL) 1856 return -ENXIO; 1857 1858 read_lock_bh(&idev->lock); 1859 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1860 if (ifp->prefix_len == plen && 1861 ipv6_addr_equal(pfx, &ifp->addr)) { 1862 in6_ifa_hold(ifp); 1863 read_unlock_bh(&idev->lock); 1864 1865 ipv6_del_addr(ifp); 1866 1867 /* If the last address is deleted administratively, 1868 disable IPv6 on this interface. 1869 */ 1870 if (idev->addr_list == NULL) 1871 addrconf_ifdown(idev->dev, 1); 1872 return 0; 1873 } 1874 } 1875 read_unlock_bh(&idev->lock); 1876 return -EADDRNOTAVAIL; 1877 } 1878 1879 1880 int addrconf_add_ifaddr(void __user *arg) 1881 { 1882 struct in6_ifreq ireq; 1883 int err; 1884 1885 if (!capable(CAP_NET_ADMIN)) 1886 return -EPERM; 1887 1888 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1889 return -EFAULT; 1890 1891 rtnl_lock(); 1892 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 1893 rtnl_unlock(); 1894 return err; 1895 } 1896 1897 int addrconf_del_ifaddr(void __user *arg) 1898 { 1899 struct in6_ifreq ireq; 1900 int err; 1901 1902 if (!capable(CAP_NET_ADMIN)) 1903 return -EPERM; 1904 1905 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1906 return -EFAULT; 1907 1908 rtnl_lock(); 1909 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 1910 rtnl_unlock(); 1911 return err; 1912 } 1913 1914 static void sit_add_v4_addrs(struct inet6_dev *idev) 1915 { 1916 struct inet6_ifaddr * ifp; 1917 struct in6_addr addr; 1918 struct net_device *dev; 1919 int scope; 1920 1921 ASSERT_RTNL(); 1922 1923 memset(&addr, 0, sizeof(struct in6_addr)); 1924 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 1925 1926 if (idev->dev->flags&IFF_POINTOPOINT) { 1927 addr.s6_addr32[0] = htonl(0xfe800000); 1928 scope = IFA_LINK; 1929 } else { 1930 scope = IPV6_ADDR_COMPATv4; 1931 } 1932 1933 if (addr.s6_addr32[3]) { 1934 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 1935 if (!IS_ERR(ifp)) { 1936 spin_lock_bh(&ifp->lock); 1937 ifp->flags &= ~IFA_F_TENTATIVE; 1938 spin_unlock_bh(&ifp->lock); 1939 ipv6_ifa_notify(RTM_NEWADDR, ifp); 1940 in6_ifa_put(ifp); 1941 } 1942 return; 1943 } 1944 1945 for (dev = dev_base; dev != NULL; dev = dev->next) { 1946 struct in_device * in_dev = __in_dev_get_rtnl(dev); 1947 if (in_dev && (dev->flags & IFF_UP)) { 1948 struct in_ifaddr * ifa; 1949 1950 int flag = scope; 1951 1952 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1953 int plen; 1954 1955 addr.s6_addr32[3] = ifa->ifa_local; 1956 1957 if (ifa->ifa_scope == RT_SCOPE_LINK) 1958 continue; 1959 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 1960 if (idev->dev->flags&IFF_POINTOPOINT) 1961 continue; 1962 flag |= IFA_HOST; 1963 } 1964 if (idev->dev->flags&IFF_POINTOPOINT) 1965 plen = 64; 1966 else 1967 plen = 96; 1968 1969 ifp = ipv6_add_addr(idev, &addr, plen, flag, 1970 IFA_F_PERMANENT); 1971 if (!IS_ERR(ifp)) { 1972 spin_lock_bh(&ifp->lock); 1973 ifp->flags &= ~IFA_F_TENTATIVE; 1974 spin_unlock_bh(&ifp->lock); 1975 ipv6_ifa_notify(RTM_NEWADDR, ifp); 1976 in6_ifa_put(ifp); 1977 } 1978 } 1979 } 1980 } 1981 } 1982 1983 static void init_loopback(struct net_device *dev) 1984 { 1985 struct inet6_dev *idev; 1986 struct inet6_ifaddr * ifp; 1987 1988 /* ::1 */ 1989 1990 ASSERT_RTNL(); 1991 1992 if ((idev = ipv6_find_idev(dev)) == NULL) { 1993 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 1994 return; 1995 } 1996 1997 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 1998 if (!IS_ERR(ifp)) { 1999 spin_lock_bh(&ifp->lock); 2000 ifp->flags &= ~IFA_F_TENTATIVE; 2001 spin_unlock_bh(&ifp->lock); 2002 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2003 in6_ifa_put(ifp); 2004 } 2005 } 2006 2007 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2008 { 2009 struct inet6_ifaddr * ifp; 2010 2011 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT); 2012 if (!IS_ERR(ifp)) { 2013 addrconf_dad_start(ifp, 0); 2014 in6_ifa_put(ifp); 2015 } 2016 } 2017 2018 static void addrconf_dev_config(struct net_device *dev) 2019 { 2020 struct in6_addr addr; 2021 struct inet6_dev * idev; 2022 2023 ASSERT_RTNL(); 2024 2025 if ((dev->type != ARPHRD_ETHER) && 2026 (dev->type != ARPHRD_FDDI) && 2027 (dev->type != ARPHRD_IEEE802_TR) && 2028 (dev->type != ARPHRD_ARCNET) && 2029 (dev->type != ARPHRD_INFINIBAND)) { 2030 /* Alas, we support only Ethernet autoconfiguration. */ 2031 return; 2032 } 2033 2034 idev = addrconf_add_dev(dev); 2035 if (idev == NULL) 2036 return; 2037 2038 memset(&addr, 0, sizeof(struct in6_addr)); 2039 addr.s6_addr32[0] = htonl(0xFE800000); 2040 2041 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2042 addrconf_add_linklocal(idev, &addr); 2043 } 2044 2045 static void addrconf_sit_config(struct net_device *dev) 2046 { 2047 struct inet6_dev *idev; 2048 2049 ASSERT_RTNL(); 2050 2051 /* 2052 * Configure the tunnel with one of our IPv4 2053 * addresses... we should configure all of 2054 * our v4 addrs in the tunnel 2055 */ 2056 2057 if ((idev = ipv6_find_idev(dev)) == NULL) { 2058 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2059 return; 2060 } 2061 2062 sit_add_v4_addrs(idev); 2063 2064 if (dev->flags&IFF_POINTOPOINT) { 2065 addrconf_add_mroute(dev); 2066 addrconf_add_lroute(dev); 2067 } else 2068 sit_route_add(dev); 2069 } 2070 2071 static inline int 2072 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2073 { 2074 struct in6_addr lladdr; 2075 2076 if (!ipv6_get_lladdr(link_dev, &lladdr)) { 2077 addrconf_add_linklocal(idev, &lladdr); 2078 return 0; 2079 } 2080 return -1; 2081 } 2082 2083 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2084 { 2085 struct net_device *link_dev; 2086 2087 /* first try to inherit the link-local address from the link device */ 2088 if (idev->dev->iflink && 2089 (link_dev = __dev_get_by_index(idev->dev->iflink))) { 2090 if (!ipv6_inherit_linklocal(idev, link_dev)) 2091 return; 2092 } 2093 /* then try to inherit it from any device */ 2094 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) { 2095 if (!ipv6_inherit_linklocal(idev, link_dev)) 2096 return; 2097 } 2098 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2099 } 2100 2101 /* 2102 * Autoconfigure tunnel with a link-local address so routing protocols, 2103 * DHCPv6, MLD etc. can be run over the virtual link 2104 */ 2105 2106 static void addrconf_ip6_tnl_config(struct net_device *dev) 2107 { 2108 struct inet6_dev *idev; 2109 2110 ASSERT_RTNL(); 2111 2112 if ((idev = addrconf_add_dev(dev)) == NULL) { 2113 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2114 return; 2115 } 2116 ip6_tnl_add_linklocal(idev); 2117 addrconf_add_mroute(dev); 2118 } 2119 2120 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2121 void * data) 2122 { 2123 struct net_device *dev = (struct net_device *) data; 2124 struct inet6_dev *idev = __in6_dev_get(dev); 2125 2126 switch(event) { 2127 case NETDEV_UP: 2128 switch(dev->type) { 2129 case ARPHRD_SIT: 2130 addrconf_sit_config(dev); 2131 break; 2132 case ARPHRD_TUNNEL6: 2133 addrconf_ip6_tnl_config(dev); 2134 break; 2135 case ARPHRD_LOOPBACK: 2136 init_loopback(dev); 2137 break; 2138 2139 default: 2140 addrconf_dev_config(dev); 2141 break; 2142 }; 2143 if (idev) { 2144 /* If the MTU changed during the interface down, when the 2145 interface up, the changed MTU must be reflected in the 2146 idev as well as routers. 2147 */ 2148 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2149 rt6_mtu_change(dev, dev->mtu); 2150 idev->cnf.mtu6 = dev->mtu; 2151 } 2152 idev->tstamp = jiffies; 2153 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2154 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2155 stop IPv6 on this interface. 2156 */ 2157 if (dev->mtu < IPV6_MIN_MTU) 2158 addrconf_ifdown(dev, event != NETDEV_DOWN); 2159 } 2160 break; 2161 2162 case NETDEV_CHANGEMTU: 2163 if ( idev && dev->mtu >= IPV6_MIN_MTU) { 2164 rt6_mtu_change(dev, dev->mtu); 2165 idev->cnf.mtu6 = dev->mtu; 2166 break; 2167 } 2168 2169 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2170 2171 case NETDEV_DOWN: 2172 case NETDEV_UNREGISTER: 2173 /* 2174 * Remove all addresses from this interface. 2175 */ 2176 addrconf_ifdown(dev, event != NETDEV_DOWN); 2177 break; 2178 case NETDEV_CHANGE: 2179 break; 2180 case NETDEV_CHANGENAME: 2181 #ifdef CONFIG_SYSCTL 2182 if (idev) { 2183 addrconf_sysctl_unregister(&idev->cnf); 2184 neigh_sysctl_unregister(idev->nd_parms); 2185 neigh_sysctl_register(dev, idev->nd_parms, 2186 NET_IPV6, NET_IPV6_NEIGH, "ipv6", 2187 &ndisc_ifinfo_sysctl_change, 2188 NULL); 2189 addrconf_sysctl_register(idev, &idev->cnf); 2190 } 2191 #endif 2192 break; 2193 }; 2194 2195 return NOTIFY_OK; 2196 } 2197 2198 /* 2199 * addrconf module should be notified of a device going up 2200 */ 2201 static struct notifier_block ipv6_dev_notf = { 2202 .notifier_call = addrconf_notify, 2203 .priority = 0 2204 }; 2205 2206 static int addrconf_ifdown(struct net_device *dev, int how) 2207 { 2208 struct inet6_dev *idev; 2209 struct inet6_ifaddr *ifa, **bifa; 2210 int i; 2211 2212 ASSERT_RTNL(); 2213 2214 if (dev == &loopback_dev && how == 1) 2215 how = 0; 2216 2217 rt6_ifdown(dev); 2218 neigh_ifdown(&nd_tbl, dev); 2219 2220 idev = __in6_dev_get(dev); 2221 if (idev == NULL) 2222 return -ENODEV; 2223 2224 /* Step 1: remove reference to ipv6 device from parent device. 2225 Do not dev_put! 2226 */ 2227 if (how == 1) { 2228 write_lock_bh(&addrconf_lock); 2229 dev->ip6_ptr = NULL; 2230 idev->dead = 1; 2231 write_unlock_bh(&addrconf_lock); 2232 2233 /* Step 1.5: remove snmp6 entry */ 2234 snmp6_unregister_dev(idev); 2235 2236 } 2237 2238 /* Step 2: clear hash table */ 2239 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2240 bifa = &inet6_addr_lst[i]; 2241 2242 write_lock_bh(&addrconf_hash_lock); 2243 while ((ifa = *bifa) != NULL) { 2244 if (ifa->idev == idev) { 2245 *bifa = ifa->lst_next; 2246 ifa->lst_next = NULL; 2247 addrconf_del_timer(ifa); 2248 in6_ifa_put(ifa); 2249 continue; 2250 } 2251 bifa = &ifa->lst_next; 2252 } 2253 write_unlock_bh(&addrconf_hash_lock); 2254 } 2255 2256 write_lock_bh(&idev->lock); 2257 2258 /* Step 3: clear flags for stateless addrconf */ 2259 if (how != 1) 2260 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD); 2261 2262 /* Step 4: clear address list */ 2263 #ifdef CONFIG_IPV6_PRIVACY 2264 if (how == 1 && del_timer(&idev->regen_timer)) 2265 in6_dev_put(idev); 2266 2267 /* clear tempaddr list */ 2268 while ((ifa = idev->tempaddr_list) != NULL) { 2269 idev->tempaddr_list = ifa->tmp_next; 2270 ifa->tmp_next = NULL; 2271 ifa->dead = 1; 2272 write_unlock_bh(&idev->lock); 2273 spin_lock_bh(&ifa->lock); 2274 2275 if (ifa->ifpub) { 2276 in6_ifa_put(ifa->ifpub); 2277 ifa->ifpub = NULL; 2278 } 2279 spin_unlock_bh(&ifa->lock); 2280 in6_ifa_put(ifa); 2281 write_lock_bh(&idev->lock); 2282 } 2283 #endif 2284 while ((ifa = idev->addr_list) != NULL) { 2285 idev->addr_list = ifa->if_next; 2286 ifa->if_next = NULL; 2287 ifa->dead = 1; 2288 addrconf_del_timer(ifa); 2289 write_unlock_bh(&idev->lock); 2290 2291 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2292 in6_ifa_put(ifa); 2293 2294 write_lock_bh(&idev->lock); 2295 } 2296 write_unlock_bh(&idev->lock); 2297 2298 /* Step 5: Discard multicast list */ 2299 2300 if (how == 1) 2301 ipv6_mc_destroy_dev(idev); 2302 else 2303 ipv6_mc_down(idev); 2304 2305 /* Step 5: netlink notification of this interface */ 2306 idev->tstamp = jiffies; 2307 inet6_ifinfo_notify(RTM_DELLINK, idev); 2308 2309 /* Shot the device (if unregistered) */ 2310 2311 if (how == 1) { 2312 #ifdef CONFIG_SYSCTL 2313 addrconf_sysctl_unregister(&idev->cnf); 2314 neigh_sysctl_unregister(idev->nd_parms); 2315 #endif 2316 neigh_parms_release(&nd_tbl, idev->nd_parms); 2317 neigh_ifdown(&nd_tbl, dev); 2318 in6_dev_put(idev); 2319 } 2320 return 0; 2321 } 2322 2323 static void addrconf_rs_timer(unsigned long data) 2324 { 2325 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2326 2327 if (ifp->idev->cnf.forwarding) 2328 goto out; 2329 2330 if (ifp->idev->if_flags & IF_RA_RCVD) { 2331 /* 2332 * Announcement received after solicitation 2333 * was sent 2334 */ 2335 goto out; 2336 } 2337 2338 spin_lock(&ifp->lock); 2339 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2340 struct in6_addr all_routers; 2341 2342 /* The wait after the last probe can be shorter */ 2343 addrconf_mod_timer(ifp, AC_RS, 2344 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2345 ifp->idev->cnf.rtr_solicit_delay : 2346 ifp->idev->cnf.rtr_solicit_interval); 2347 spin_unlock(&ifp->lock); 2348 2349 ipv6_addr_all_routers(&all_routers); 2350 2351 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2352 } else { 2353 spin_unlock(&ifp->lock); 2354 /* 2355 * Note: we do not support deprecated "all on-link" 2356 * assumption any longer. 2357 */ 2358 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2359 ifp->idev->dev->name); 2360 } 2361 2362 out: 2363 in6_ifa_put(ifp); 2364 } 2365 2366 /* 2367 * Duplicate Address Detection 2368 */ 2369 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2370 { 2371 struct inet6_dev *idev = ifp->idev; 2372 struct net_device *dev = idev->dev; 2373 unsigned long rand_num; 2374 2375 addrconf_join_solict(dev, &ifp->addr); 2376 2377 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT)) 2378 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0, 2379 flags); 2380 2381 net_srandom(ifp->addr.s6_addr32[3]); 2382 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2383 2384 read_lock_bh(&idev->lock); 2385 if (ifp->dead) 2386 goto out; 2387 spin_lock_bh(&ifp->lock); 2388 2389 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2390 !(ifp->flags&IFA_F_TENTATIVE)) { 2391 ifp->flags &= ~IFA_F_TENTATIVE; 2392 spin_unlock_bh(&ifp->lock); 2393 read_unlock_bh(&idev->lock); 2394 2395 addrconf_dad_completed(ifp); 2396 return; 2397 } 2398 2399 ifp->probes = idev->cnf.dad_transmits; 2400 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2401 2402 spin_unlock_bh(&ifp->lock); 2403 out: 2404 read_unlock_bh(&idev->lock); 2405 } 2406 2407 static void addrconf_dad_timer(unsigned long data) 2408 { 2409 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2410 struct inet6_dev *idev = ifp->idev; 2411 struct in6_addr unspec; 2412 struct in6_addr mcaddr; 2413 2414 read_lock_bh(&idev->lock); 2415 if (idev->dead) { 2416 read_unlock_bh(&idev->lock); 2417 goto out; 2418 } 2419 spin_lock_bh(&ifp->lock); 2420 if (ifp->probes == 0) { 2421 /* 2422 * DAD was successful 2423 */ 2424 2425 ifp->flags &= ~IFA_F_TENTATIVE; 2426 spin_unlock_bh(&ifp->lock); 2427 read_unlock_bh(&idev->lock); 2428 2429 addrconf_dad_completed(ifp); 2430 2431 goto out; 2432 } 2433 2434 ifp->probes--; 2435 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2436 spin_unlock_bh(&ifp->lock); 2437 read_unlock_bh(&idev->lock); 2438 2439 /* send a neighbour solicitation for our addr */ 2440 memset(&unspec, 0, sizeof(unspec)); 2441 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2442 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2443 out: 2444 in6_ifa_put(ifp); 2445 } 2446 2447 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2448 { 2449 struct net_device * dev = ifp->idev->dev; 2450 2451 /* 2452 * Configure the address for reception. Now it is valid. 2453 */ 2454 2455 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2456 2457 /* If added prefix is link local and forwarding is off, 2458 start sending router solicitations. 2459 */ 2460 2461 if (ifp->idev->cnf.forwarding == 0 && 2462 ifp->idev->cnf.rtr_solicits > 0 && 2463 (dev->flags&IFF_LOOPBACK) == 0 && 2464 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2465 struct in6_addr all_routers; 2466 2467 ipv6_addr_all_routers(&all_routers); 2468 2469 /* 2470 * If a host as already performed a random delay 2471 * [...] as part of DAD [...] there is no need 2472 * to delay again before sending the first RS 2473 */ 2474 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2475 2476 spin_lock_bh(&ifp->lock); 2477 ifp->probes = 1; 2478 ifp->idev->if_flags |= IF_RS_SENT; 2479 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2480 spin_unlock_bh(&ifp->lock); 2481 } 2482 } 2483 2484 #ifdef CONFIG_PROC_FS 2485 struct if6_iter_state { 2486 int bucket; 2487 }; 2488 2489 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2490 { 2491 struct inet6_ifaddr *ifa = NULL; 2492 struct if6_iter_state *state = seq->private; 2493 2494 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2495 ifa = inet6_addr_lst[state->bucket]; 2496 if (ifa) 2497 break; 2498 } 2499 return ifa; 2500 } 2501 2502 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2503 { 2504 struct if6_iter_state *state = seq->private; 2505 2506 ifa = ifa->lst_next; 2507 try_again: 2508 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2509 ifa = inet6_addr_lst[state->bucket]; 2510 goto try_again; 2511 } 2512 return ifa; 2513 } 2514 2515 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2516 { 2517 struct inet6_ifaddr *ifa = if6_get_first(seq); 2518 2519 if (ifa) 2520 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2521 --pos; 2522 return pos ? NULL : ifa; 2523 } 2524 2525 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2526 { 2527 read_lock_bh(&addrconf_hash_lock); 2528 return if6_get_idx(seq, *pos); 2529 } 2530 2531 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2532 { 2533 struct inet6_ifaddr *ifa; 2534 2535 ifa = if6_get_next(seq, v); 2536 ++*pos; 2537 return ifa; 2538 } 2539 2540 static void if6_seq_stop(struct seq_file *seq, void *v) 2541 { 2542 read_unlock_bh(&addrconf_hash_lock); 2543 } 2544 2545 static int if6_seq_show(struct seq_file *seq, void *v) 2546 { 2547 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2548 seq_printf(seq, 2549 "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n", 2550 NIP6(ifp->addr), 2551 ifp->idev->dev->ifindex, 2552 ifp->prefix_len, 2553 ifp->scope, 2554 ifp->flags, 2555 ifp->idev->dev->name); 2556 return 0; 2557 } 2558 2559 static struct seq_operations if6_seq_ops = { 2560 .start = if6_seq_start, 2561 .next = if6_seq_next, 2562 .show = if6_seq_show, 2563 .stop = if6_seq_stop, 2564 }; 2565 2566 static int if6_seq_open(struct inode *inode, struct file *file) 2567 { 2568 struct seq_file *seq; 2569 int rc = -ENOMEM; 2570 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2571 2572 if (!s) 2573 goto out; 2574 memset(s, 0, sizeof(*s)); 2575 2576 rc = seq_open(file, &if6_seq_ops); 2577 if (rc) 2578 goto out_kfree; 2579 2580 seq = file->private_data; 2581 seq->private = s; 2582 out: 2583 return rc; 2584 out_kfree: 2585 kfree(s); 2586 goto out; 2587 } 2588 2589 static struct file_operations if6_fops = { 2590 .owner = THIS_MODULE, 2591 .open = if6_seq_open, 2592 .read = seq_read, 2593 .llseek = seq_lseek, 2594 .release = seq_release_private, 2595 }; 2596 2597 int __init if6_proc_init(void) 2598 { 2599 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops)) 2600 return -ENOMEM; 2601 return 0; 2602 } 2603 2604 void if6_proc_exit(void) 2605 { 2606 proc_net_remove("if_inet6"); 2607 } 2608 #endif /* CONFIG_PROC_FS */ 2609 2610 /* 2611 * Periodic address status verification 2612 */ 2613 2614 static void addrconf_verify(unsigned long foo) 2615 { 2616 struct inet6_ifaddr *ifp; 2617 unsigned long now, next; 2618 int i; 2619 2620 spin_lock_bh(&addrconf_verify_lock); 2621 now = jiffies; 2622 next = now + ADDR_CHECK_FREQUENCY; 2623 2624 del_timer(&addr_chk_timer); 2625 2626 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2627 2628 restart: 2629 write_lock(&addrconf_hash_lock); 2630 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2631 unsigned long age; 2632 #ifdef CONFIG_IPV6_PRIVACY 2633 unsigned long regen_advance; 2634 #endif 2635 2636 if (ifp->flags & IFA_F_PERMANENT) 2637 continue; 2638 2639 spin_lock(&ifp->lock); 2640 age = (now - ifp->tstamp) / HZ; 2641 2642 #ifdef CONFIG_IPV6_PRIVACY 2643 regen_advance = ifp->idev->cnf.regen_max_retry * 2644 ifp->idev->cnf.dad_transmits * 2645 ifp->idev->nd_parms->retrans_time / HZ; 2646 #endif 2647 2648 if (age >= ifp->valid_lft) { 2649 spin_unlock(&ifp->lock); 2650 in6_ifa_hold(ifp); 2651 write_unlock(&addrconf_hash_lock); 2652 ipv6_del_addr(ifp); 2653 goto restart; 2654 } else if (age >= ifp->prefered_lft) { 2655 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2656 int deprecate = 0; 2657 2658 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2659 deprecate = 1; 2660 ifp->flags |= IFA_F_DEPRECATED; 2661 } 2662 2663 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2664 next = ifp->tstamp + ifp->valid_lft * HZ; 2665 2666 spin_unlock(&ifp->lock); 2667 2668 if (deprecate) { 2669 in6_ifa_hold(ifp); 2670 write_unlock(&addrconf_hash_lock); 2671 2672 ipv6_ifa_notify(0, ifp); 2673 in6_ifa_put(ifp); 2674 goto restart; 2675 } 2676 #ifdef CONFIG_IPV6_PRIVACY 2677 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2678 !(ifp->flags&IFA_F_TENTATIVE)) { 2679 if (age >= ifp->prefered_lft - regen_advance) { 2680 struct inet6_ifaddr *ifpub = ifp->ifpub; 2681 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2682 next = ifp->tstamp + ifp->prefered_lft * HZ; 2683 if (!ifp->regen_count && ifpub) { 2684 ifp->regen_count++; 2685 in6_ifa_hold(ifp); 2686 in6_ifa_hold(ifpub); 2687 spin_unlock(&ifp->lock); 2688 write_unlock(&addrconf_hash_lock); 2689 ipv6_create_tempaddr(ifpub, ifp); 2690 in6_ifa_put(ifpub); 2691 in6_ifa_put(ifp); 2692 goto restart; 2693 } 2694 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2695 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2696 spin_unlock(&ifp->lock); 2697 #endif 2698 } else { 2699 /* ifp->prefered_lft <= ifp->valid_lft */ 2700 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2701 next = ifp->tstamp + ifp->prefered_lft * HZ; 2702 spin_unlock(&ifp->lock); 2703 } 2704 } 2705 write_unlock(&addrconf_hash_lock); 2706 } 2707 2708 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2709 add_timer(&addr_chk_timer); 2710 spin_unlock_bh(&addrconf_verify_lock); 2711 } 2712 2713 static int 2714 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2715 { 2716 struct rtattr **rta = arg; 2717 struct ifaddrmsg *ifm = NLMSG_DATA(nlh); 2718 struct in6_addr *pfx; 2719 2720 pfx = NULL; 2721 if (rta[IFA_ADDRESS-1]) { 2722 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx)) 2723 return -EINVAL; 2724 pfx = RTA_DATA(rta[IFA_ADDRESS-1]); 2725 } 2726 if (rta[IFA_LOCAL-1]) { 2727 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))) 2728 return -EINVAL; 2729 pfx = RTA_DATA(rta[IFA_LOCAL-1]); 2730 } 2731 if (pfx == NULL) 2732 return -EINVAL; 2733 2734 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 2735 } 2736 2737 static int 2738 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2739 { 2740 struct rtattr **rta = arg; 2741 struct ifaddrmsg *ifm = NLMSG_DATA(nlh); 2742 struct in6_addr *pfx; 2743 2744 pfx = NULL; 2745 if (rta[IFA_ADDRESS-1]) { 2746 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx)) 2747 return -EINVAL; 2748 pfx = RTA_DATA(rta[IFA_ADDRESS-1]); 2749 } 2750 if (rta[IFA_LOCAL-1]) { 2751 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))) 2752 return -EINVAL; 2753 pfx = RTA_DATA(rta[IFA_LOCAL-1]); 2754 } 2755 if (pfx == NULL) 2756 return -EINVAL; 2757 2758 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 2759 } 2760 2761 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 2762 u32 pid, u32 seq, int event, unsigned int flags) 2763 { 2764 struct ifaddrmsg *ifm; 2765 struct nlmsghdr *nlh; 2766 struct ifa_cacheinfo ci; 2767 unsigned char *b = skb->tail; 2768 2769 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); 2770 ifm = NLMSG_DATA(nlh); 2771 ifm->ifa_family = AF_INET6; 2772 ifm->ifa_prefixlen = ifa->prefix_len; 2773 ifm->ifa_flags = ifa->flags; 2774 ifm->ifa_scope = RT_SCOPE_UNIVERSE; 2775 if (ifa->scope&IFA_HOST) 2776 ifm->ifa_scope = RT_SCOPE_HOST; 2777 else if (ifa->scope&IFA_LINK) 2778 ifm->ifa_scope = RT_SCOPE_LINK; 2779 else if (ifa->scope&IFA_SITE) 2780 ifm->ifa_scope = RT_SCOPE_SITE; 2781 ifm->ifa_index = ifa->idev->dev->ifindex; 2782 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr); 2783 if (!(ifa->flags&IFA_F_PERMANENT)) { 2784 ci.ifa_prefered = ifa->prefered_lft; 2785 ci.ifa_valid = ifa->valid_lft; 2786 if (ci.ifa_prefered != INFINITY_LIFE_TIME) { 2787 long tval = (jiffies - ifa->tstamp)/HZ; 2788 ci.ifa_prefered -= tval; 2789 if (ci.ifa_valid != INFINITY_LIFE_TIME) 2790 ci.ifa_valid -= tval; 2791 } 2792 } else { 2793 ci.ifa_prefered = INFINITY_LIFE_TIME; 2794 ci.ifa_valid = INFINITY_LIFE_TIME; 2795 } 2796 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100 2797 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 2798 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100 2799 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 2800 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); 2801 nlh->nlmsg_len = skb->tail - b; 2802 return skb->len; 2803 2804 nlmsg_failure: 2805 rtattr_failure: 2806 skb_trim(skb, b - skb->data); 2807 return -1; 2808 } 2809 2810 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 2811 u32 pid, u32 seq, int event, u16 flags) 2812 { 2813 struct ifaddrmsg *ifm; 2814 struct nlmsghdr *nlh; 2815 struct ifa_cacheinfo ci; 2816 unsigned char *b = skb->tail; 2817 2818 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); 2819 ifm = NLMSG_DATA(nlh); 2820 ifm->ifa_family = AF_INET6; 2821 ifm->ifa_prefixlen = 128; 2822 ifm->ifa_flags = IFA_F_PERMANENT; 2823 ifm->ifa_scope = RT_SCOPE_UNIVERSE; 2824 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE) 2825 ifm->ifa_scope = RT_SCOPE_SITE; 2826 ifm->ifa_index = ifmca->idev->dev->ifindex; 2827 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr); 2828 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ 2829 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ 2830 * 100 / HZ); 2831 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ 2832 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ 2833 * 100 / HZ); 2834 ci.ifa_prefered = INFINITY_LIFE_TIME; 2835 ci.ifa_valid = INFINITY_LIFE_TIME; 2836 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); 2837 nlh->nlmsg_len = skb->tail - b; 2838 return skb->len; 2839 2840 nlmsg_failure: 2841 rtattr_failure: 2842 skb_trim(skb, b - skb->data); 2843 return -1; 2844 } 2845 2846 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 2847 u32 pid, u32 seq, int event, unsigned int flags) 2848 { 2849 struct ifaddrmsg *ifm; 2850 struct nlmsghdr *nlh; 2851 struct ifa_cacheinfo ci; 2852 unsigned char *b = skb->tail; 2853 2854 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); 2855 ifm = NLMSG_DATA(nlh); 2856 ifm->ifa_family = AF_INET6; 2857 ifm->ifa_prefixlen = 128; 2858 ifm->ifa_flags = IFA_F_PERMANENT; 2859 ifm->ifa_scope = RT_SCOPE_UNIVERSE; 2860 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE) 2861 ifm->ifa_scope = RT_SCOPE_SITE; 2862 ifm->ifa_index = ifaca->aca_idev->dev->ifindex; 2863 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr); 2864 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ 2865 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ 2866 * 100 / HZ); 2867 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ 2868 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ 2869 * 100 / HZ); 2870 ci.ifa_prefered = INFINITY_LIFE_TIME; 2871 ci.ifa_valid = INFINITY_LIFE_TIME; 2872 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); 2873 nlh->nlmsg_len = skb->tail - b; 2874 return skb->len; 2875 2876 nlmsg_failure: 2877 rtattr_failure: 2878 skb_trim(skb, b - skb->data); 2879 return -1; 2880 } 2881 2882 enum addr_type_t 2883 { 2884 UNICAST_ADDR, 2885 MULTICAST_ADDR, 2886 ANYCAST_ADDR, 2887 }; 2888 2889 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 2890 enum addr_type_t type) 2891 { 2892 int idx, ip_idx; 2893 int s_idx, s_ip_idx; 2894 int err = 1; 2895 struct net_device *dev; 2896 struct inet6_dev *idev = NULL; 2897 struct inet6_ifaddr *ifa; 2898 struct ifmcaddr6 *ifmca; 2899 struct ifacaddr6 *ifaca; 2900 2901 s_idx = cb->args[0]; 2902 s_ip_idx = ip_idx = cb->args[1]; 2903 read_lock(&dev_base_lock); 2904 2905 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { 2906 if (idx < s_idx) 2907 continue; 2908 if (idx > s_idx) 2909 s_ip_idx = 0; 2910 ip_idx = 0; 2911 if ((idev = in6_dev_get(dev)) == NULL) 2912 continue; 2913 read_lock_bh(&idev->lock); 2914 switch (type) { 2915 case UNICAST_ADDR: 2916 /* unicast address incl. temp addr */ 2917 for (ifa = idev->addr_list; ifa; 2918 ifa = ifa->if_next, ip_idx++) { 2919 if (ip_idx < s_ip_idx) 2920 continue; 2921 if ((err = inet6_fill_ifaddr(skb, ifa, 2922 NETLINK_CB(cb->skb).pid, 2923 cb->nlh->nlmsg_seq, RTM_NEWADDR, 2924 NLM_F_MULTI)) <= 0) 2925 goto done; 2926 } 2927 break; 2928 case MULTICAST_ADDR: 2929 /* multicast address */ 2930 for (ifmca = idev->mc_list; ifmca; 2931 ifmca = ifmca->next, ip_idx++) { 2932 if (ip_idx < s_ip_idx) 2933 continue; 2934 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 2935 NETLINK_CB(cb->skb).pid, 2936 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 2937 NLM_F_MULTI)) <= 0) 2938 goto done; 2939 } 2940 break; 2941 case ANYCAST_ADDR: 2942 /* anycast address */ 2943 for (ifaca = idev->ac_list; ifaca; 2944 ifaca = ifaca->aca_next, ip_idx++) { 2945 if (ip_idx < s_ip_idx) 2946 continue; 2947 if ((err = inet6_fill_ifacaddr(skb, ifaca, 2948 NETLINK_CB(cb->skb).pid, 2949 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 2950 NLM_F_MULTI)) <= 0) 2951 goto done; 2952 } 2953 break; 2954 default: 2955 break; 2956 } 2957 read_unlock_bh(&idev->lock); 2958 in6_dev_put(idev); 2959 } 2960 done: 2961 if (err <= 0) { 2962 read_unlock_bh(&idev->lock); 2963 in6_dev_put(idev); 2964 } 2965 read_unlock(&dev_base_lock); 2966 cb->args[0] = idx; 2967 cb->args[1] = ip_idx; 2968 return skb->len; 2969 } 2970 2971 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 2972 { 2973 enum addr_type_t type = UNICAST_ADDR; 2974 return inet6_dump_addr(skb, cb, type); 2975 } 2976 2977 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 2978 { 2979 enum addr_type_t type = MULTICAST_ADDR; 2980 return inet6_dump_addr(skb, cb, type); 2981 } 2982 2983 2984 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 2985 { 2986 enum addr_type_t type = ANYCAST_ADDR; 2987 return inet6_dump_addr(skb, cb, type); 2988 } 2989 2990 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 2991 { 2992 struct sk_buff *skb; 2993 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128); 2994 2995 skb = alloc_skb(size, GFP_ATOMIC); 2996 if (!skb) { 2997 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS); 2998 return; 2999 } 3000 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) { 3001 kfree_skb(skb); 3002 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL); 3003 return; 3004 } 3005 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR; 3006 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC); 3007 } 3008 3009 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf, 3010 __s32 *array, int bytes) 3011 { 3012 memset(array, 0, bytes); 3013 array[DEVCONF_FORWARDING] = cnf->forwarding; 3014 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3015 array[DEVCONF_MTU6] = cnf->mtu6; 3016 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3017 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3018 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3019 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3020 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3021 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3022 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3023 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3024 #ifdef CONFIG_IPV6_PRIVACY 3025 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3026 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3027 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3028 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3029 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3030 #endif 3031 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3032 } 3033 3034 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3035 u32 pid, u32 seq, int event, unsigned int flags) 3036 { 3037 struct net_device *dev = idev->dev; 3038 __s32 *array = NULL; 3039 struct ifinfomsg *r; 3040 struct nlmsghdr *nlh; 3041 unsigned char *b = skb->tail; 3042 struct rtattr *subattr; 3043 __u32 mtu = dev->mtu; 3044 struct ifla_cacheinfo ci; 3045 3046 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); 3047 r = NLMSG_DATA(nlh); 3048 r->ifi_family = AF_INET6; 3049 r->__ifi_pad = 0; 3050 r->ifi_type = dev->type; 3051 r->ifi_index = dev->ifindex; 3052 r->ifi_flags = dev_get_flags(dev); 3053 r->ifi_change = 0; 3054 3055 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); 3056 3057 if (dev->addr_len) 3058 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3059 3060 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); 3061 if (dev->ifindex != dev->iflink) 3062 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink); 3063 3064 subattr = (struct rtattr*)skb->tail; 3065 3066 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL); 3067 3068 /* return the device flags */ 3069 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags); 3070 3071 /* return interface cacheinfo */ 3072 ci.max_reasm_len = IPV6_MAXPLEN; 3073 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3074 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3075 ci.reachable_time = idev->nd_parms->reachable_time; 3076 ci.retrans_time = idev->nd_parms->retrans_time; 3077 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3078 3079 /* return the device sysctl params */ 3080 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL) 3081 goto rtattr_failure; 3082 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array)); 3083 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array); 3084 3085 /* XXX - Statistics/MC not implemented */ 3086 subattr->rta_len = skb->tail - (u8*)subattr; 3087 3088 nlh->nlmsg_len = skb->tail - b; 3089 kfree(array); 3090 return skb->len; 3091 3092 nlmsg_failure: 3093 rtattr_failure: 3094 kfree(array); 3095 skb_trim(skb, b - skb->data); 3096 return -1; 3097 } 3098 3099 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3100 { 3101 int idx, err; 3102 int s_idx = cb->args[0]; 3103 struct net_device *dev; 3104 struct inet6_dev *idev; 3105 3106 read_lock(&dev_base_lock); 3107 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { 3108 if (idx < s_idx) 3109 continue; 3110 if ((idev = in6_dev_get(dev)) == NULL) 3111 continue; 3112 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3113 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3114 in6_dev_put(idev); 3115 if (err <= 0) 3116 break; 3117 } 3118 read_unlock(&dev_base_lock); 3119 cb->args[0] = idx; 3120 3121 return skb->len; 3122 } 3123 3124 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3125 { 3126 struct sk_buff *skb; 3127 /* 128 bytes ?? */ 3128 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128); 3129 3130 skb = alloc_skb(size, GFP_ATOMIC); 3131 if (!skb) { 3132 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS); 3133 return; 3134 } 3135 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) { 3136 kfree_skb(skb); 3137 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL); 3138 return; 3139 } 3140 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO; 3141 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC); 3142 } 3143 3144 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3145 struct prefix_info *pinfo, u32 pid, u32 seq, 3146 int event, unsigned int flags) 3147 { 3148 struct prefixmsg *pmsg; 3149 struct nlmsghdr *nlh; 3150 unsigned char *b = skb->tail; 3151 struct prefix_cacheinfo ci; 3152 3153 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags); 3154 pmsg = NLMSG_DATA(nlh); 3155 pmsg->prefix_family = AF_INET6; 3156 pmsg->prefix_pad1 = 0; 3157 pmsg->prefix_pad2 = 0; 3158 pmsg->prefix_ifindex = idev->dev->ifindex; 3159 pmsg->prefix_len = pinfo->prefix_len; 3160 pmsg->prefix_type = pinfo->type; 3161 pmsg->prefix_pad3 = 0; 3162 3163 pmsg->prefix_flags = 0; 3164 if (pinfo->onlink) 3165 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3166 if (pinfo->autoconf) 3167 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3168 3169 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3170 3171 ci.preferred_time = ntohl(pinfo->prefered); 3172 ci.valid_time = ntohl(pinfo->valid); 3173 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3174 3175 nlh->nlmsg_len = skb->tail - b; 3176 return skb->len; 3177 3178 nlmsg_failure: 3179 rtattr_failure: 3180 skb_trim(skb, b - skb->data); 3181 return -1; 3182 } 3183 3184 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3185 struct prefix_info *pinfo) 3186 { 3187 struct sk_buff *skb; 3188 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128); 3189 3190 skb = alloc_skb(size, GFP_ATOMIC); 3191 if (!skb) { 3192 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS); 3193 return; 3194 } 3195 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) { 3196 kfree_skb(skb); 3197 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL); 3198 return; 3199 } 3200 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX; 3201 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC); 3202 } 3203 3204 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = { 3205 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, }, 3206 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, }, 3207 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, }, 3208 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, }, 3209 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, }, 3210 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, }, 3211 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, }, 3212 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, }, 3213 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute, 3214 .dumpit = inet6_dump_fib, }, 3215 }; 3216 3217 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3218 { 3219 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3220 3221 switch (event) { 3222 case RTM_NEWADDR: 3223 dst_hold(&ifp->rt->u.dst); 3224 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL)) 3225 dst_release(&ifp->rt->u.dst); 3226 if (ifp->idev->cnf.forwarding) 3227 addrconf_join_anycast(ifp); 3228 break; 3229 case RTM_DELADDR: 3230 if (ifp->idev->cnf.forwarding) 3231 addrconf_leave_anycast(ifp); 3232 addrconf_leave_solict(ifp->idev, &ifp->addr); 3233 dst_hold(&ifp->rt->u.dst); 3234 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL)) 3235 dst_free(&ifp->rt->u.dst); 3236 else 3237 dst_release(&ifp->rt->u.dst); 3238 break; 3239 } 3240 } 3241 3242 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3243 { 3244 read_lock_bh(&addrconf_lock); 3245 if (likely(ifp->idev->dead == 0)) 3246 __ipv6_ifa_notify(event, ifp); 3247 read_unlock_bh(&addrconf_lock); 3248 } 3249 3250 #ifdef CONFIG_SYSCTL 3251 3252 static 3253 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3254 void __user *buffer, size_t *lenp, loff_t *ppos) 3255 { 3256 int *valp = ctl->data; 3257 int val = *valp; 3258 int ret; 3259 3260 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3261 3262 if (write && valp != &ipv6_devconf_dflt.forwarding) { 3263 if (valp != &ipv6_devconf.forwarding) { 3264 if ((!*valp) ^ (!val)) { 3265 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 3266 if (idev == NULL) 3267 return ret; 3268 dev_forward_change(idev); 3269 } 3270 } else { 3271 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; 3272 addrconf_forward_change(); 3273 } 3274 if (*valp) 3275 rt6_purge_dflt_routers(); 3276 } 3277 3278 return ret; 3279 } 3280 3281 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3282 int __user *name, int nlen, 3283 void __user *oldval, 3284 size_t __user *oldlenp, 3285 void __user *newval, size_t newlen, 3286 void **context) 3287 { 3288 int *valp = table->data; 3289 int new; 3290 3291 if (!newval || !newlen) 3292 return 0; 3293 if (newlen != sizeof(int)) 3294 return -EINVAL; 3295 if (get_user(new, (int __user *)newval)) 3296 return -EFAULT; 3297 if (new == *valp) 3298 return 0; 3299 if (oldval && oldlenp) { 3300 size_t len; 3301 if (get_user(len, oldlenp)) 3302 return -EFAULT; 3303 if (len) { 3304 if (len > table->maxlen) 3305 len = table->maxlen; 3306 if (copy_to_user(oldval, valp, len)) 3307 return -EFAULT; 3308 if (put_user(len, oldlenp)) 3309 return -EFAULT; 3310 } 3311 } 3312 3313 if (valp != &ipv6_devconf_dflt.forwarding) { 3314 if (valp != &ipv6_devconf.forwarding) { 3315 struct inet6_dev *idev = (struct inet6_dev *)table->extra1; 3316 int changed; 3317 if (unlikely(idev == NULL)) 3318 return -ENODEV; 3319 changed = (!*valp) ^ (!new); 3320 *valp = new; 3321 if (changed) 3322 dev_forward_change(idev); 3323 } else { 3324 *valp = new; 3325 addrconf_forward_change(); 3326 } 3327 3328 if (*valp) 3329 rt6_purge_dflt_routers(); 3330 } else 3331 *valp = new; 3332 3333 return 1; 3334 } 3335 3336 static struct addrconf_sysctl_table 3337 { 3338 struct ctl_table_header *sysctl_header; 3339 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3340 ctl_table addrconf_dev[2]; 3341 ctl_table addrconf_conf_dir[2]; 3342 ctl_table addrconf_proto_dir[2]; 3343 ctl_table addrconf_root_dir[2]; 3344 } addrconf_sysctl = { 3345 .sysctl_header = NULL, 3346 .addrconf_vars = { 3347 { 3348 .ctl_name = NET_IPV6_FORWARDING, 3349 .procname = "forwarding", 3350 .data = &ipv6_devconf.forwarding, 3351 .maxlen = sizeof(int), 3352 .mode = 0644, 3353 .proc_handler = &addrconf_sysctl_forward, 3354 .strategy = &addrconf_sysctl_forward_strategy, 3355 }, 3356 { 3357 .ctl_name = NET_IPV6_HOP_LIMIT, 3358 .procname = "hop_limit", 3359 .data = &ipv6_devconf.hop_limit, 3360 .maxlen = sizeof(int), 3361 .mode = 0644, 3362 .proc_handler = proc_dointvec, 3363 }, 3364 { 3365 .ctl_name = NET_IPV6_MTU, 3366 .procname = "mtu", 3367 .data = &ipv6_devconf.mtu6, 3368 .maxlen = sizeof(int), 3369 .mode = 0644, 3370 .proc_handler = &proc_dointvec, 3371 }, 3372 { 3373 .ctl_name = NET_IPV6_ACCEPT_RA, 3374 .procname = "accept_ra", 3375 .data = &ipv6_devconf.accept_ra, 3376 .maxlen = sizeof(int), 3377 .mode = 0644, 3378 .proc_handler = &proc_dointvec, 3379 }, 3380 { 3381 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3382 .procname = "accept_redirects", 3383 .data = &ipv6_devconf.accept_redirects, 3384 .maxlen = sizeof(int), 3385 .mode = 0644, 3386 .proc_handler = &proc_dointvec, 3387 }, 3388 { 3389 .ctl_name = NET_IPV6_AUTOCONF, 3390 .procname = "autoconf", 3391 .data = &ipv6_devconf.autoconf, 3392 .maxlen = sizeof(int), 3393 .mode = 0644, 3394 .proc_handler = &proc_dointvec, 3395 }, 3396 { 3397 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3398 .procname = "dad_transmits", 3399 .data = &ipv6_devconf.dad_transmits, 3400 .maxlen = sizeof(int), 3401 .mode = 0644, 3402 .proc_handler = &proc_dointvec, 3403 }, 3404 { 3405 .ctl_name = NET_IPV6_RTR_SOLICITS, 3406 .procname = "router_solicitations", 3407 .data = &ipv6_devconf.rtr_solicits, 3408 .maxlen = sizeof(int), 3409 .mode = 0644, 3410 .proc_handler = &proc_dointvec, 3411 }, 3412 { 3413 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3414 .procname = "router_solicitation_interval", 3415 .data = &ipv6_devconf.rtr_solicit_interval, 3416 .maxlen = sizeof(int), 3417 .mode = 0644, 3418 .proc_handler = &proc_dointvec_jiffies, 3419 .strategy = &sysctl_jiffies, 3420 }, 3421 { 3422 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3423 .procname = "router_solicitation_delay", 3424 .data = &ipv6_devconf.rtr_solicit_delay, 3425 .maxlen = sizeof(int), 3426 .mode = 0644, 3427 .proc_handler = &proc_dointvec_jiffies, 3428 .strategy = &sysctl_jiffies, 3429 }, 3430 { 3431 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3432 .procname = "force_mld_version", 3433 .data = &ipv6_devconf.force_mld_version, 3434 .maxlen = sizeof(int), 3435 .mode = 0644, 3436 .proc_handler = &proc_dointvec, 3437 }, 3438 #ifdef CONFIG_IPV6_PRIVACY 3439 { 3440 .ctl_name = NET_IPV6_USE_TEMPADDR, 3441 .procname = "use_tempaddr", 3442 .data = &ipv6_devconf.use_tempaddr, 3443 .maxlen = sizeof(int), 3444 .mode = 0644, 3445 .proc_handler = &proc_dointvec, 3446 }, 3447 { 3448 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3449 .procname = "temp_valid_lft", 3450 .data = &ipv6_devconf.temp_valid_lft, 3451 .maxlen = sizeof(int), 3452 .mode = 0644, 3453 .proc_handler = &proc_dointvec, 3454 }, 3455 { 3456 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3457 .procname = "temp_prefered_lft", 3458 .data = &ipv6_devconf.temp_prefered_lft, 3459 .maxlen = sizeof(int), 3460 .mode = 0644, 3461 .proc_handler = &proc_dointvec, 3462 }, 3463 { 3464 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3465 .procname = "regen_max_retry", 3466 .data = &ipv6_devconf.regen_max_retry, 3467 .maxlen = sizeof(int), 3468 .mode = 0644, 3469 .proc_handler = &proc_dointvec, 3470 }, 3471 { 3472 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3473 .procname = "max_desync_factor", 3474 .data = &ipv6_devconf.max_desync_factor, 3475 .maxlen = sizeof(int), 3476 .mode = 0644, 3477 .proc_handler = &proc_dointvec, 3478 }, 3479 #endif 3480 { 3481 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3482 .procname = "max_addresses", 3483 .data = &ipv6_devconf.max_addresses, 3484 .maxlen = sizeof(int), 3485 .mode = 0644, 3486 .proc_handler = &proc_dointvec, 3487 }, 3488 { 3489 .ctl_name = 0, /* sentinel */ 3490 } 3491 }, 3492 .addrconf_dev = { 3493 { 3494 .ctl_name = NET_PROTO_CONF_ALL, 3495 .procname = "all", 3496 .mode = 0555, 3497 .child = addrconf_sysctl.addrconf_vars, 3498 }, 3499 { 3500 .ctl_name = 0, /* sentinel */ 3501 } 3502 }, 3503 .addrconf_conf_dir = { 3504 { 3505 .ctl_name = NET_IPV6_CONF, 3506 .procname = "conf", 3507 .mode = 0555, 3508 .child = addrconf_sysctl.addrconf_dev, 3509 }, 3510 { 3511 .ctl_name = 0, /* sentinel */ 3512 } 3513 }, 3514 .addrconf_proto_dir = { 3515 { 3516 .ctl_name = NET_IPV6, 3517 .procname = "ipv6", 3518 .mode = 0555, 3519 .child = addrconf_sysctl.addrconf_conf_dir, 3520 }, 3521 { 3522 .ctl_name = 0, /* sentinel */ 3523 } 3524 }, 3525 .addrconf_root_dir = { 3526 { 3527 .ctl_name = CTL_NET, 3528 .procname = "net", 3529 .mode = 0555, 3530 .child = addrconf_sysctl.addrconf_proto_dir, 3531 }, 3532 { 3533 .ctl_name = 0, /* sentinel */ 3534 } 3535 }, 3536 }; 3537 3538 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) 3539 { 3540 int i; 3541 struct net_device *dev = idev ? idev->dev : NULL; 3542 struct addrconf_sysctl_table *t; 3543 char *dev_name = NULL; 3544 3545 t = kmalloc(sizeof(*t), GFP_KERNEL); 3546 if (t == NULL) 3547 return; 3548 memcpy(t, &addrconf_sysctl, sizeof(*t)); 3549 for (i=0; t->addrconf_vars[i].data; i++) { 3550 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 3551 t->addrconf_vars[i].de = NULL; 3552 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 3553 } 3554 if (dev) { 3555 dev_name = dev->name; 3556 t->addrconf_dev[0].ctl_name = dev->ifindex; 3557 } else { 3558 dev_name = "default"; 3559 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 3560 } 3561 3562 /* 3563 * Make a copy of dev_name, because '.procname' is regarded as const 3564 * by sysctl and we wouldn't want anyone to change it under our feet 3565 * (see SIOCSIFNAME). 3566 */ 3567 dev_name = kstrdup(dev_name, GFP_KERNEL); 3568 if (!dev_name) 3569 goto free; 3570 3571 t->addrconf_dev[0].procname = dev_name; 3572 3573 t->addrconf_dev[0].child = t->addrconf_vars; 3574 t->addrconf_dev[0].de = NULL; 3575 t->addrconf_conf_dir[0].child = t->addrconf_dev; 3576 t->addrconf_conf_dir[0].de = NULL; 3577 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; 3578 t->addrconf_proto_dir[0].de = NULL; 3579 t->addrconf_root_dir[0].child = t->addrconf_proto_dir; 3580 t->addrconf_root_dir[0].de = NULL; 3581 3582 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0); 3583 if (t->sysctl_header == NULL) 3584 goto free_procname; 3585 else 3586 p->sysctl = t; 3587 return; 3588 3589 /* error path */ 3590 free_procname: 3591 kfree(dev_name); 3592 free: 3593 kfree(t); 3594 3595 return; 3596 } 3597 3598 static void addrconf_sysctl_unregister(struct ipv6_devconf *p) 3599 { 3600 if (p->sysctl) { 3601 struct addrconf_sysctl_table *t = p->sysctl; 3602 p->sysctl = NULL; 3603 unregister_sysctl_table(t->sysctl_header); 3604 kfree(t->addrconf_dev[0].procname); 3605 kfree(t); 3606 } 3607 } 3608 3609 3610 #endif 3611 3612 /* 3613 * Device notifier 3614 */ 3615 3616 int register_inet6addr_notifier(struct notifier_block *nb) 3617 { 3618 return notifier_chain_register(&inet6addr_chain, nb); 3619 } 3620 3621 int unregister_inet6addr_notifier(struct notifier_block *nb) 3622 { 3623 return notifier_chain_unregister(&inet6addr_chain,nb); 3624 } 3625 3626 /* 3627 * Init / cleanup code 3628 */ 3629 3630 int __init addrconf_init(void) 3631 { 3632 int err = 0; 3633 3634 /* The addrconf netdev notifier requires that loopback_dev 3635 * has it's ipv6 private information allocated and setup 3636 * before it can bring up and give link-local addresses 3637 * to other devices which are up. 3638 * 3639 * Unfortunately, loopback_dev is not necessarily the first 3640 * entry in the global dev_base list of net devices. In fact, 3641 * it is likely to be the very last entry on that list. 3642 * So this causes the notifier registry below to try and 3643 * give link-local addresses to all devices besides loopback_dev 3644 * first, then loopback_dev, which cases all the non-loopback_dev 3645 * devices to fail to get a link-local address. 3646 * 3647 * So, as a temporary fix, allocate the ipv6 structure for 3648 * loopback_dev first by hand. 3649 * Longer term, all of the dependencies ipv6 has upon the loopback 3650 * device and it being up should be removed. 3651 */ 3652 rtnl_lock(); 3653 if (!ipv6_add_dev(&loopback_dev)) 3654 err = -ENOMEM; 3655 rtnl_unlock(); 3656 if (err) 3657 return err; 3658 3659 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev); 3660 3661 register_netdevice_notifier(&ipv6_dev_notf); 3662 3663 #ifdef CONFIG_IPV6_PRIVACY 3664 md5_tfm = crypto_alloc_tfm("md5", 0); 3665 if (unlikely(md5_tfm == NULL)) 3666 printk(KERN_WARNING 3667 "failed to load transform for md5\n"); 3668 #endif 3669 3670 addrconf_verify(0); 3671 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table; 3672 #ifdef CONFIG_SYSCTL 3673 addrconf_sysctl.sysctl_header = 3674 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0); 3675 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); 3676 #endif 3677 3678 return 0; 3679 } 3680 3681 void __exit addrconf_cleanup(void) 3682 { 3683 struct net_device *dev; 3684 struct inet6_dev *idev; 3685 struct inet6_ifaddr *ifa; 3686 int i; 3687 3688 unregister_netdevice_notifier(&ipv6_dev_notf); 3689 3690 rtnetlink_links[PF_INET6] = NULL; 3691 #ifdef CONFIG_SYSCTL 3692 addrconf_sysctl_unregister(&ipv6_devconf_dflt); 3693 addrconf_sysctl_unregister(&ipv6_devconf); 3694 #endif 3695 3696 rtnl_lock(); 3697 3698 /* 3699 * clean dev list. 3700 */ 3701 3702 for (dev=dev_base; dev; dev=dev->next) { 3703 if ((idev = __in6_dev_get(dev)) == NULL) 3704 continue; 3705 addrconf_ifdown(dev, 1); 3706 } 3707 addrconf_ifdown(&loopback_dev, 2); 3708 3709 /* 3710 * Check hash table. 3711 */ 3712 3713 write_lock_bh(&addrconf_hash_lock); 3714 for (i=0; i < IN6_ADDR_HSIZE; i++) { 3715 for (ifa=inet6_addr_lst[i]; ifa; ) { 3716 struct inet6_ifaddr *bifa; 3717 3718 bifa = ifa; 3719 ifa = ifa->lst_next; 3720 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 3721 /* Do not free it; something is wrong. 3722 Now we can investigate it with debugger. 3723 */ 3724 } 3725 } 3726 write_unlock_bh(&addrconf_hash_lock); 3727 3728 del_timer(&addr_chk_timer); 3729 3730 rtnl_unlock(); 3731 3732 #ifdef CONFIG_IPV6_PRIVACY 3733 crypto_free_tfm(md5_tfm); 3734 md5_tfm = NULL; 3735 #endif 3736 3737 #ifdef CONFIG_PROC_FS 3738 proc_net_remove("if_inet6"); 3739 #endif 3740 } 3741